CN102759887B

CN102759887B - Electronic device, personal computer, host and display

Info

Publication number: CN102759887B
Application number: CN201110108689.6A
Authority: CN
Inventors: 林静忠
Original assignee: Innolux Shenzhen Co Ltd; Innolux Display Corp
Current assignee: Innocom Technology Shenzhen Co Ltd; Innolux Shenzhen Co Ltd; Innolux Corp
Priority date: 2011-04-28
Filing date: 2011-04-28
Publication date: 2015-03-11
Anticipated expiration: 2031-04-28
Also published as: CN102759887A

Abstract

The invention relates to an electronic device which comprises a power supply device and a load device, wherein the power supply circuit of the power supply device supplies direct current voltage for the load device; the power supply device comprises a voltage control unit connected between the power supply circuit and the load device, and is used for controlling the power supply circuit to selectively output at least one direct current voltage to at least one load device according to whether receiving reference potential from the at least one load device; and the load device comprises a switching unit connected to the reference potential, and a user controls the switching unit to selectively supply the reference potential for the voltage control unit. Typically, the electronic device is a personal computer, the power supply device is a host of the personal computer, and the load device is a display connected with the host. The electronic device has the characteristic of saving electricity.

Description

Electronic installation, PC, main frame and display

Technical field

The present invention relates to a kind of electronic installation, especially, relate to a kind of electronic installation being applied to pc domain.

Background technology

Along with the development of IT industry, each electronic product (as computing machine, display, DVD, portable hard disk and audio player etc.) is little by little more and more applied in the work of people and life, and how making powers to each electronic product becomes an important problem.

Current electronic product all needs configuration one electric supply installation usually, as power supply adaptor etc., for transferring external communication electricity the needs of DC voltage for this electronic product to.Usually, as long as when the electric supply installation such as power input interface and power supply adaptor of electronic product is connected, after grafting, namely this power supply adaptor provides the power supply of required by electronic product or the battery built-in to electronic product to charge.Now, the on off state of electronic product does not affect the operation of power supply adaptor.Therefore, even if electronic product is in the state of shutdown, electric supply installation also provides power supply to electronic product as usual, thus causes the power consumption of electronic product large, cannot meet the requirement of Vehicles Collected from Market low energy consumption.

Summary of the invention

There is the large technical matters of power consumption for solving prior art electronic product when off-mode, being necessary the electronic installation that a kind of more power saving is provided.

A kind of electronic installation, comprise an electric supply installation and at least one load device, this electric supply installation comprises a power circuit, and the alternating voltage that external circuit exports by this power circuit is converted at least one DC voltage, and this at least one load device receives this at least one DC voltage and normally works.This electric supply installation comprises at least one voltage control unit further, this at least one voltage control unit is connected between this power circuit and this at least one load device, and whether foundation receives the reference potential from this at least one load device, controls this power circuit and optionally exports this at least one DC voltage to this at least one load device.This at least one load device comprises a switch element, and this switch element is connected between this reference potential and this voltage control unit, and according to user to the control of this switch element, this reference potential is optionally provided to this voltage control unit.When this reference potential exports this voltage control unit to via this switch element, this voltage control unit controls this power circuit and exports this at least one DC voltage to this at least one load; When this reference potential does not export this voltage control unit to via this switch element, this voltage control unit controls this power circuit to be stopped exporting this at least one DC voltage.

A kind of electronic installation, this electronic installation provides the voltage needed for work at least one load device, comprise an electric supply installation and at least one load device, this electric supply installation comprises a power circuit, the alternating voltage that external circuit exports by this power circuit is converted at least one DC voltage, and this at least one load device receives this at least one DC voltage and normally works.This electric supply installation comprises at least one voltage control unit and a main circuit further.This at least one voltage control unit is connected between this power circuit and this at least one load device.This at least one voltage control unit comprises a sense terminal, this sense terminal is used for detecting and whether receives a reference potential, and this at least one voltage control unit controls this power circuit and exports this at least one DC voltage to this at least one load device when receiving this reference potential.This main circuit comprises one first and selects control port, and this first selection control port shows still to provide reference potential to the selection signal of this sense terminal by this at least one load device by this electric supply installation for receiving one.This main circuit can export this reference potential to this sense terminal according to this selection signal-selectivity received.This at least one load device comprise a switch element with one with this first select control port to be connected second select control port.This switch element is connected between this reference potential and this voltage control unit, and according to user to the control of this switch element, this reference potential is optionally provided to this sense terminal.This electronic installation comprises a selection control module further, and the instruction that this selection control module sends according to user produces this selection signal respectively to this main circuit and this at least one load device.When user's setting provides this reference potential by this electric supply installation to this sense terminal, produce this reference potential to this sense terminal by this main circuit, this at least one load device shielding exports this reference potential; When user's setting provides this reference potential by this at least one load device to this sense terminal, produce this reference potential to this sense terminal by this at least one load device, the shielding of this main circuit exports this reference potential.

Further, provide a kind of PC, the display comprising a main frame and be connected with this main frame.This main frame comprises a power circuit, and this power circuit provides the operating voltage needed for work for this main frame, an alternating voltage of an external circuit input is converted to the DC voltage needed for this display work simultaneously; This display comprises an input end, and this input end is for receiving this DC voltage thus making this display normally work; This main frame comprises at least one voltage control unit further, this at least one voltage control unit is connected between this power circuit and input end of this display, and whether foundation receives the reference potential from this display, controls this power circuit and optionally exports the input end of this DC voltage to this display; This display comprises the switch element be connected with a reference potential, user controls this reference potential by the conducting triggering this switch element and is optionally provided to this at least one voltage control unit, when this reference potential exports this at least one voltage control unit to via this switch element, this at least one voltage control unit controls this power circuit and exports this DC voltage to this display, when this reference potential does not export this voltage control unit to, this voltage control unit controls this power circuit to be stopped exporting this DC voltage.

A kind of electronic installation, this electronic installation can provide operating voltage at least one load device, this at least one load device and this electronic installation are independently arranged, and be connected via at least one cable, this electronic installation comprises a power circuit, the alternating voltage that external circuit exports by this power circuit is converted at least one DC voltage, and this at least one load device receives this at least one DC voltage and normally works; This electronic installation comprises at least one voltage control unit and a main circuit further, this at least one voltage control unit is connected between this power circuit and this at least one load device, this at least one voltage control unit comprises a sense terminal, this sense terminal is used for detecting and whether receives a reference potential, and this at least one voltage control unit controls this power circuit and exports this at least one DC voltage to this at least one load device when receiving this reference potential; This main circuit comprises one first and selects control port, this the first selection control port shows still to provide reference potential to the selection signal of this sense terminal by this at least one load device by this electric supply installation for receiving one, and this main circuit can export this reference potential to this sense terminal according to this selection signal-selectivity received; This at least one load device comprise a switch element with one with this first select control port to be connected second select control port, this switch element is connected between this reference potential and this voltage control unit, and according to user to the control of this switch element, this reference potential is optionally provided to this sense terminal.This electronic installation comprises a selection control module further, the instruction that this selection control module sends according to user produces this selection signal respectively to this main circuit and this at least one load device, when user's setting provides this reference potential by this electric supply installation to this sense terminal, produce this reference potential to this sense terminal by this main circuit, this at least one load device shielding exports this reference potential; When user's setting provides this reference potential by this at least one load device to this sense terminal, produce this reference potential to this sense terminal by this at least one load device, the shielding of this main circuit exports this reference potential.

A kind of main frame, it provides operating voltage for a display, and this display is connected with this main frame, and user produces a reference potential to this main frame by the switch control touching this display, this display comprises one for receiving this DC voltage thus making the input end that this display normally works

This main frame comprises a power circuit, and this power circuit provides the operating voltage needed for work for this main frame, an alternating voltage of an external circuit input is converted to the DC voltage needed for this display work simultaneously; This main frame comprises at least one voltage control unit further, this at least one voltage control unit is connected between this power circuit and input end of this display, and whether foundation receives the reference potential from this display, controls this power circuit and optionally exports the input end of this DC voltage to this display; When this reference potential exports this at least one voltage control unit to via this switch element, this at least one voltage control unit controls this power circuit and exports this DC voltage to this display, when this reference potential does not export this voltage control unit to, this voltage control unit controls this power circuit to be stopped exporting this DC voltage.

Further, the display that a kind of and above-mentioned main frame is connected is provided, this display comprises a switch element, this switch element is connected between this reference potential and this voltage control unit, and according to user to the control of this switch element, this reference potential is optionally provided to this voltage control unit.

Compared with prior art, in electronic installation of the present invention, because user can export this reference potential to this electric supply installation by the Action Selection of the switch element of control load device, this electric supply installation can correspondingly to change power circuit be the power supply state that this load device is powered according to whether receiving this reference potential, therefore when this load device does not work, user can reach this reference potential of stopping output by controlling this switch element action, and this electric supply installation controls this power circuit to be stopped powering to this load device.As, when user control display close time, this main frame can respond this closing motion, and controls power circuit and stop power supply to display.Therefore, electronic installation of the present invention can change the power supply state of power circuit by load side, reach the object of power saving.In addition, due in the electronic installation of this case, the power supply state of user also by selecting control module to select still to be controlled by this load device by this electric supply installation power circuit, increases the use dirigibility of this electronic installation.

Accompanying drawing explanation

Fig. 1 is the circuit block diagram of electronic installation one first embodiment of the present invention.

Fig. 2 is the partial circuit figure of a kind of embodiment of electric supply installation of the electronic installation shown in Fig. 1.

Fig. 3 is the switch control of switch element when being a touch switch, the circuit block diagram of electronic installation of the present invention.

The circuit block diagram of load device one embodiment that Fig. 4 is electronic installation shown in Fig. 3.

Fig. 5 is the particular circuit configurations figure of a kind of embodiment of the load device shown in Fig. 3.

Fig. 6 is the circuit block diagram of electronic installation one second embodiment of the present invention.

Fig. 7 is a kind of partial circuit block scheme changing embodiment of the load device of electronic installation shown in Fig. 6.

Fig. 8 is a kind of circuit block diagram changing embodiment of the load device of electronic installation shown in Fig. 6.

Fig. 9 is a kind of circuit block diagram changing embodiment of the electric supply installation of electronic installation shown in Fig. 6.

Figure 10 is the circuit block diagram of electronic installation one of the present invention 3rd embodiment.

Figure 11 is for being applicable to the particular circuit configurations of a kind of embodiment of the transient stability circuit be arranged between the first output terminal and locking signal input end shown in Figure 10.

Figure 12 is for being suitable for the particular circuit configurations of a kind of embodiment of the transient stability circuit be arranged between the first input end of this load device and this locking signal input end shown in Figure 10.

Figure 13 is the circuit block diagram that electronic installation one of the present invention changes embodiment.

Figure 14 is the circuit block diagram of electronic installation one embody rule example of the present invention.

Main element symbol description

Electronic installation 10

Electric supply installation 100

Load device 190

Power circuit 110

Voltage control circuit 120

Voltage control unit 121

On-off circuit 123

Circuit for detecting 125

Delay circuit 127

Indicating circuit 129

First output terminal 111

First input end 1911

End 1913 to be detected

Sense terminal 1251

First Control of Voltage subelement 121a

Second Control of Voltage subelement 121b

Sense terminal 1251

First switching transistor 140

First conduction terminal 141

Second conduction terminal 143

Control end 145

Series arm 150

First resistance 151

Second resistance 153

First diode 155

Delay startup electric capacity 159

Second switch transistor 160

Controlling brancher 170

3rd resistance 171

Electric capacity 173

Second diode 175

Current-limiting resistance 181

Light emitting diode 183

Filter capacitor 187

Output unit 195

Switch element 191

Locking control module 192

Lock-in circuit 197

Feedback branch 196

Microcontroller 194

Select control module 240

Control input end 1941

Control output end 1943

Shielding control end 1945

Transient stability circuit 310

Locking signal input end 1971

Node P1

Touching switch 1912

Triode Q1

Main circuit 210

Control module 211

Output port 217

First selects control port 219

Second selects control port 198

Screen unit 199

Diode D1, D2, D21, D22, D23

Resistance R1, R2

Gate-controlled switch 218

Transistor Q11

First end S11

Second end D11

Control end G11

Memory capacitance C11, C21

Bleeder circuit 311

Diode string 321

Buffer circuit 410

First buffer circuit 410a

Second buffer circuit 410b

Panel driving 81

Backlight drive 91

Backlight 90

Panel 80

First load subelement 190a

Second load subelement 190b

Following embodiment will further illustrate the present invention in conjunction with above-mentioned accompanying drawing.

Embodiment

Refer to Fig. 1, it is the circuit block diagram of electronic installation one first embodiment of the present invention.This electronic installation 10 comprises an electric supply installation 100 and at least one load device 190, and this electric supply installation 100 is for providing DC voltage for load device 190 to load device 190.Be to be understood that, this electronic installation 10 can comprise one, two or more load device 190, and this electric supply installation 100 can to one, two or more load device (first to N load device as shown in Figure 1, and wherein N is greater than 2, and is natural number) power supply.Wherein, in the embodiment shown in Fig. 1, mainly comprise multiple load device 190 based on this electronic installation 10 and this electric supply installation 100 is to the situation that multiple load device 190 is powered that the present invention will be described.

Particularly, this electric supply installation 100 can be a host computer, a TV or a power supply unit.The plurality of load device 190 can be the electronic products such as display, digital TV set-top box, portable hard disk, video player, audio player, audio amplifier.Be provided with the switch element 191 that is connected to a reference potential (as: earthing potential) in each load device 190, then the first to N load device 190 correspondence is provided with 1 to N switch element 191.In a kind of embodiment, when this electric supply installation 100 is a host computer, this first can be display, computer hard disc, audio amplifier etc. to N load device 190 respectively, and corresponding switch element 191 can comprise and is arranged at the switch control on display, computer hard disc or audio amplifier and the on-off circuit for sensing this switch control action and corresponding conducting and shutoff respectively.In another kind of embodiment, when this electric supply installation is a TV, this first can be video player, digital TV set-top box, audio amplifier etc. to N load device 190 respectively, and corresponding switch element 191 can comprise the switch control that is arranged at video player, digital TV set-top box or phonotape and videotape and the on-off circuit for sensing this switch control action and corresponding conducting and shutoff.In the present embodiment, this switch element 191 is a switch open in usual, and when this switch conduction open in usual, this reference potential exports via the switch element 191 of this conducting.In addition, this switch control is preferably a touch switch, whenever this switch control is touched or by time next time, this switch element 191 with regard to respective closed conducting once, and work as this switch element 191 conducting once, this electric supply installation 100 to the corresponding change of power supply state of corresponding load unit 190 once, now, need locking control module (referring to Fig. 3) according to the turn-on action of this switch element 191 to change the power supply/access state of this electric supply installation 100 to corresponding load unit 190, to realize lock function.

This electric supply installation 100 comprises power circuit 110 and a voltage control circuit 120.This power circuit 110 flows voltage for receiving external communication voltage and being changed thus export at least always, is one first DC voltage in the present embodiment.This voltage control circuit 120 is supplied to the plurality of load device 190 for this first DC voltage exported by this power circuit 110, and it comprises multiple voltage control unit 121 (as first, second is to N voltage control unit).The corresponding load device 190 of each voltage control unit 121, for receiving this first DC voltage and controlling this first DC voltage to be supplied to this load device 190 to power to this load device 190.It will be appreciated, of course, that this power circuit also can provide multiple DC voltage to be sent to respectively on corresponding load unit 190 via a voltage control unit 121 respectively.

In present embodiment, this first, second there is substantially identical circuit structure and principle of work to N voltage control unit 121, to be mainly below introduced for this first voltage control unit 121.But, should be appreciated that the following description for this first voltage control unit 121 can be applied to this equally second to the load device 190 of N voltage control unit 121 and correspondence thereof.

This first voltage control unit 121 comprises on-off circuit 123 and a circuit for detecting 125.This on-off circuit 123 is connected between this power circuit 110 and this first load device 190, and the first DC voltage produced to make this power circuit 110 is supplied to this first load device 190 via this on-off circuit 123.This circuit for detecting 125 is connected between the switch element 191 of this first load device 190 and this power circuit 110, whether provide this reference potential to this first voltage control unit 121 for detecting this first load device 190, and according to detecting conducting or the cut-off of this on-off circuit 123 of output control.This reference potential is transmitted to this first voltage control unit 121 when this circuit for detecting 125 detects this first load device 190, this circuit for detecting 125 controls this on-off circuit 123 conducting, this first DC voltage that this power circuit 110 is exported is provided to this first load device 190 via this on-off circuit 123, to power to this first load device 190.When this circuit for detecting 125 do not detect this first load device 190 transmit reference potential to this first voltage control unit 121 time, this circuit for detecting 125 controls this on-off circuit 123 to be ended, and does not namely provide this first DC voltage to this first load device 190.

This power circuit 110 comprises one for exporting the first output terminal 111 of this first DC voltage.This first load device 190 comprises one for receiving the first input end 1911 of this first DC voltage.One end of this on-off circuit 123 is electrically connected the first output terminal 111 of this power circuit 110 for receiving this first DC voltage, the other end is electrically connected the first input end 1911 of this first load device 190, for providing this first DC voltage to the first input end 1911 of this first load device 190 when conducting.Particularly, when the first input end 1911 of this first load device 190 receives this first DC voltage, this first load device 190 can be started working.

This circuit for detecting 125 comprises one for detecting the sense terminal 1251 whether this first load device 190 accesses.Particularly, after this circuit for detecting 125 starts, when this sense terminal 1251 is provided a reference potential (as earthing potential 0V), then this circuit for detecting 125 controls this on-off circuit 123 conducting to power to this first load device 190.When this sense terminal 1251 is unsettled, then this circuit for detecting 125 controls this on-off circuit 123 and ends, and does not namely power to this first load device 190.Accordingly, the switch element 191 of this first load device 190 also comprises an end 1913 to be detected, the sense terminal 1251 that this end 1913 to be detected is connected to this circuit for detecting 125 is detected for this sense terminal 1251, this end 1913 to be detected is provided this reference potential, particularly, when this switch element 191 conducting, this end 1913 to be detected can obtain this reference potential to this circuit for detecting 125 via this switch element 191 ground connection, this circuit for detecting 125 controls this on-off circuit 123 conducting according to this reference potential received, this first DC voltage is provided to this first load device 190 to power thus to make this first load device 190 start working via the on-off circuit 123 of this conducting.Otherwise when this switch element 191 ends, this end 1913 to be detected is unsettled, this circuit for detecting 125 does not detect this reference potential thus controls this on-off circuit 123 and ends, and this first DC voltage stops being supplied to this first load device 190.

In one embodiment, this first voltage control unit 121 can also comprise an indicating circuit 129, and whether for showing this on-off circuit 123 conducting, alternatively whether this first DC voltage has been loaded on this first load device 190.Preferably, this indicating circuit 129 connects the node between this on-off circuit 123 and first input end 1911 of this first load device 190, and it is in parallel with this first load device 190, thus, when this first load device 190 is loaded this first DC voltage, this indicating circuit 129 is also loaded this first DC voltage, thus this indicating circuit 129 can be started working, thus shows to user the information that this first load device 190 is loaded this first DC voltage.

Preferably, this first voltage control unit 121 can further include a delay circuit 127, and this delay circuit 127 starts for controlling this circuit for detecting 125 after postponing a schedule time.For this voltage control circuit 120 generally, this first, second can be defined as one first schedule time, one second schedule time respectively to schedule time of the delay of multiple delay circuits 127 of N voltage control unit 121 ... the one N schedule time.Preferably, this first schedule time, this second schedule time ... this N schedule time is different.

Refer to Fig. 2, it only illustrates the particular circuit configurations of electric supply installation 100 1 kinds of embodiments of the electronic installation 10 shown in Fig. 1, wherein, it should be noted that, for simplicity of illustration and convenient explanation, electronic installation shown in this Fig. 2 is relative to the electronic installation shown in Fig. 1, and only correspondence illustrates that power circuit 110, first voltage control unit 121 and the first load device 190, second are not illustrated to N voltage control unit 121 and second in the lump to N load device 190.If it will be appreciated, of course, that, the electronic installation 10 shown in Fig. 2 only relates to one first load device 190, and voltage control circuit 120 only can comprise the first voltage control unit 121 for powering to this first load device 190.

In electric supply installation 100 side, the on-off circuit 123 of this first voltage control unit 121 comprises one first switching transistor 140.This first switching transistor 140 comprises one first conduction terminal 141,1 second conduction terminal 143 and a control end 145, this first conduction terminal 141 connects the first output terminal 111 of this power circuit 110, this second conduction terminal 143 connects the first input end 1911 of this first load device 190, and this control end 145 connects this circuit for detecting 125.Preferably, this first switching transistor 140 is P-channel field-effect transistor (PEFT) transistor, and thus, this first conduction terminal 141, this second conduction terminal 143 and this control end 145 are respectively source electrode, the drain and gate of this P-channel field-effect transistor (PEFT) transistor.

This circuit for detecting 125 comprises a series arm 150.One end of this series arm 150 connects the first conduction terminal 141 of this first switching transistor 140, for receiving this first DC voltage; The other end of this series arm 150 connects the sense terminal 1251 of this circuit for detecting 125, for connecting the end to be detected 1913 of this first load device 190.When this sense terminal 1251 receives this reference potential (as earthing potential), this first DC voltage is made to connect this reference potential via this series arm 150, and then this series arm 150 conducting.When this series arm 150 conducting, this circuit for detecting 125 judges that this first load device 190 accesses.This series arm 150 comprises one first resistance 151,1 second resistance 153 and one first diode 155 connected in series.Wherein the Main Function of this first diode 155 is that one-way conduction oppositely pours into avoid this reference voltage, but change in embodiment in one, this series arm 150 also can not comprise this first diode 155.This first resistance 151 is connected between the first conduction terminal 141 of the first switching transistor 140 and control end 145, and this second resistance 153 and this first diode 155 are series between the control end 145 of this first switching transistor 140 and this sense terminal 1251.This circuit for detecting 125 can also comprise a delay startup electric capacity 159 in parallel with this first resistance 151, for necessarily postponing the detecting function of this circuit for detecting 125, reaches the effect protecting whole electric supply installation 10.

In a preferred embodiment, this first voltage control unit 121 can comprise delay circuit 127 and an indicating circuit 129.Only enumerate the circuit structure of a kind of delay circuit 127 and a kind of indicating circuit 129 below, can predict, other circuit that can realize time-lag action and indicative function also can be employed.

This delay circuit 127 comprises second switch transistor 160 and a controlling brancher 170.The two ends of this second switch transistor 160 are connected to the first output terminal 111 of this power circuit and the control end 145 of this first switching transistor 140, and its control end 165 is connected to this controlling brancher 170.This controlling brancher 170 for completing the delay of this schedule time, and controls conducting and the cut-off of this second switch transistor 160.Particularly, when this controlling brancher 170 does not complete the Delay time (carrying out the Delay time of this schedule time in other words) of this schedule time, when this controlling brancher 170 controls this second switch transistor 160 conducting, first resistance 151 of this series arm 150 is shorted, thus the series arm 150 of this circuit for detecting 125 is locked, and cannot start detecting.After this controlling brancher 170 completes the delay of this schedule time, end when this controlling brancher 170 controls this second switch transistor 160, the first resistance 151 of this series arm 150 is no longer shorted, and this circuit for detecting 125 starts detecting.

This controlling brancher 170 comprises a RC delayed branch and second diode 175 discharged for this RC delayed branch.This RC delayed branch comprises one the 3rd resistance 171 and an electric capacity 173 of series connection.3rd resistance 171 is connected between the first conduction terminal of this second switch transistor 160 and control end, between the control end that this electric capacity 173 is connected to this second switch transistor 160 and ground.This second diode 175 is in parallel with the 3rd resistance 171.

This indicating circuit 129 is connected between the second conduction terminal 143 of this first switching transistor 140 and ground, and it comprises current-limiting resistance 181 and a light emitting diode 183 of connecting with this current-limiting resistance 181.

See also Fig. 3 and Fig. 4, Fig. 3 is the circuit block diagram of this electronic installation 10 when the switch control of this switch element 191 is a touch switch, the circuit block diagram of a kind of embodiment of load device that Fig. 4 is electronic installation 10 shown in Fig. 3.Wherein, be simplicity of illustration and convenient explanation, the load device shown in this Fig. 4 is relative to the load device shown in Fig. 3, and only correspondence illustrates the first load device 190, and second does not illustrate in the lump to N load device 190.And for ease of describing, the element numbers continuing similar elements in the first embodiment is described the present embodiment.

When the switch control of this switch element 191 is a touch switch, this first load device 190 comprises locking control module 192 and an output unit 195 further.When the switch control of this switch element 191 is at every turn touched or when pressing, this switch element 191 conducting once.This output unit 195 is connected between this switch element 191 and this end 1913 to be detected, this first load device 190 be not loaded this first DC voltage and this switch element 191 conducting time, switch element 191 and this reference potential of this output unit 195, this conducting form one first loop, thus this reference potential are sent to this end 1913 to be detected.This locking control module 192 according to the turn-on action of this switch element 192, can maintain or change the reference potential that end 1913 to be detected loads.

This locking control module 192 comprises microcontroller 194, feedback branch 196 and a lock-in circuit 197.This feedback branch 196 is connected between this microcontroller 194 and the node P1 between this switch element 191 and this output unit 195, for loading this first DC voltage at this first load device 190 and this switch element 191 conducting instantaneous, form a second servo loop with this microcontroller 194, thus provide a feedback signal to this microcontroller 194.This microcontroller 194 starts normal work after this first load circuit 190 is provided the first DC voltage, and whether detecting receives this feedback signal and after receiving this feedback signal, export corresponding control signal to this lock-in circuit 197.This lock-in circuit 197, according to the control signal sent by this microcontroller 194 received, selects the output whether locked on current end to be detected 1913.Wherein, this lock-in circuit 197 can realize lock function by the electric signal continuing to export identical with the polarity of this reference potential (being all a high level or low level) to this end 1913 to be detected, preferably, exporting same level signal, is ground signalling in the present embodiment.This microcontroller 194 is an integrated microcontroller chip, if this first load device 190 is a display, this microcontroller 194 can be the microcontroller (MicroControlUnit, MCU) for driving display panel.

This microcontroller 194 comprises control input end 1941 and a control output end 1943.This control input end 1941 is connected to the node P1 between this switch element 191 and this output unit 195 via this feedback branch 196, for receiving, detecting this feedback signal.This control output end 1943 is connected to this end 1913 to be detected via this lock-in circuit 197, controls signal to this lock-in circuit 197 accordingly for exporting.When this microcontroller 194 normally works, this control output end 1943 exports control signal and changes according to the accepting state of these 1941 pairs of signals in control input end.Particularly, when this microcontroller 194 normally works and this control input end 1941 does not receive this feedback signal, this control output end 1943 maintains output one lock control signal to this lock-in circuit 197.Otherwise when this microcontroller 194 normally works and this control input end 1941 receives feedback signal, this control output end 1943 exports a cancellation lock control signal to this lock-in circuit 197.

Seeing also Fig. 5, is the particular circuit configurations figure of a kind of embodiment of the first load device 190 shown in Fig. 4.Be appreciated that in this figure the one preferably embodiment only illustrated in the multiple embodiments realizing this first load device 190 function, and be not limited to this embodiment.Wherein:

This switch element 191 comprises a touching switch 1912, and one end of this touching switch 1912 is connected to this reference potential (earthing potential), and the other end is connected to this output unit 195.When this touching switch 1912 is touched or when pressing, this touching switch 1912 only can maintain the conducting of shorter schedule time.

This output unit 195 comprises the diode D1 and a resistance R1 that are connected in series, and the negative electrode of this diode D1 is connected to this switch element 191, and anode connects this resistance R1.The other end of resistance R1 connects end 1913 to be detected.This input branch road 196 has similar structure to this output unit 195, also comprises the diode D2 and resistance R2 that are connected in series.The negative electrode of this diode D2 is connected to this node P1, and anode is connected to the control input end 1941 of this microcontroller 194 via this resistance R2.

This lock-in circuit 197 can be an on-off circuit be made up of three end control type transistors, in the present embodiment, this lock-in circuit 197 is an on-off circuit be made up of triode Q1, the grounded emitter of this triode Q1, base stage is connected to the control output end 1943 of this microcontroller 194 via a current-limiting resistance, as the locking signal input end 1971 of this lock-in circuit 197, collector is connected to this end 1913 to be detected via another current-limiting resistance.Then when the Q1 conducting of this triode, ground signalling is output to this end 1913 to be detected.Further, as long as this microcontroller 194 continues to export this lock control signal to the base stage of this triode Q1, the ground signalling of this end 1913 to be detected continues to export, thus realizes the locking that this end 1913 to be detected exports electric signal.

Lower mask body illustrates the principle of work of this electronic installation electronic installation in conjunction with these feed circuit 100 and this first load device 190, for ease of describing, definition makes this first DC voltage be loaded on the state of this first load device 190 for starting state, and definition makes this first DC voltage stop the state being loaded on this first load device 190 to be OFF state.Then:

When this switch element 191 be pressed or touch and instantaneous conducting and this first load device 190 is started time, this output unit 195 is connected to this reference potential and then forms this first loop, then this end 1913 to be detected exports this reference potential.And instantaneous due to this, this microcontroller 194 not yet starts, and this feedback branch 196 is still in open-circuit condition.Then, this circuit for detecting 125 receives this reference potential and makes this on-off circuit 123 conducting, this power circuit 110 provides this first DC voltage via the on-off circuit 123 of this conducting to this first load device 190, and this first load device 190 is activated, thus completes startup trigger process.

After this first load device 190 triggers and starts, this microcontroller 194 is also started working because being provided operating voltage, then the control output end 1943 of this microcontroller 194 continues output one lock control signal (as: high level signal) to this lock-in circuit 197.This lock-in circuit 197 continues the electric signal (as: ground signalling) of output one and this reference potential same polarity to this end 1913 to be detected under the control of this lock control signal, until this first load device 190 enters OFF state, and then complete the locking process of startup.

When by again pressing or touching, conducting makes this first load circuit 190 start to enter OFF state to this switch element 191, this microcontroller 194, this feedback branch 196 and this switch element 191 form a second servo loop, and the electromotive force at these output unit 195 two ends is consistent, reference potential as feedback signal is only sent to this control input end 1941 by this feedback branch 196, this microcontroller 194 receives this feedback signal, thus be that a cancellation lock control signal (as: low level signal) is to this lock-in circuit 197 by the output switching of this control output end 1943, this lock-in circuit 197 is made to turn off and quit work, and this switch element 191 has also turned off, then this end 1913 to be detected is unsettled, do not transmitting the circuit for detecting 125 of this reference potential to this electric supply installation 100, this circuit for detecting 125 controls this on-off circuit 123 and turns off, this power circuit 110 starts to provide powers to this first load circuit 190, thus complete the trigger process of shutoff.

After this, because this electric supply installation 100 stops powering to this first load device 190, this microcontroller 194 also quits work because not being provided voltage, then stopping output in this control output end 1943 is any controls signal to this lock-in circuit 197, this lock-in circuit 197 is opened a way, thus it is unsettled to maintain this end 1913 to be detected, until this first load unit 190 is activated again, and then complete the locking process of shutoff.

In this electronic installation 10, because user can export this reference potential to this electric supply installation 100 by the Action Selection of the switch element 191 of control load device 190, this electric supply installation 100 can correspondingly change according to whether receiving this reference potential the power supply state that power circuit 110 is the power supply of this load device 190, therefore when this load device 190 does not work, user can reach this reference potential of stopping output by controlling this switch element 191 action, and this electric supply installation 100 controls this power circuit 110 to be stopped powering to this load device 190.Therefore, this electronic installation 10 can change the power supply state of power circuit by load side, reach the object of power saving.Further, the startup of this load device and turn off process include a trigger process and a locking process, efficiently avoid the maloperation started with when turning off.

Referring to Fig. 6, is the circuit block diagram of electronic installation one second embodiment of the present invention.This electronic installation 20 is substantially identical with the structure of the electronic installation 10 of the first embodiment, for ease of describing, the element numbers continuing similar elements in the first embodiment is described the present embodiment, and the difference of the electronic installation 10 of this electronic installation 20 and the first embodiment is mainly:

The electric supply installation 100 of this electronic installation 20 comprises a main circuit 210 further, this main circuit 210 is started working receiving the DC voltage that provides of this power circuit 110, and can produce multiple reference potential respectively to this first to the sense terminal 1251 of N circuit for detecting 125.This main circuit 210 comprises a control module 211, multiple output port 217 and at least one first selects control port 219, the plurality of output port 217 is connected to the plurality of sense terminal 1251 respectively, for providing reference potential respectively to this first to the sense terminal 1251 of N circuit for detecting 125.This first selects control port 219 first to be connected to N load device 190 with this respectively, signal via transmission on this first selection control port 219 is used for selecting to provide reference voltage still to provide reference voltage by this load device 190 to this sense terminal 1251 by this main circuit 210 to this sense terminal 1251, is a selection signal by this signal definition.Correspondingly, each load device 190 also may correspond to and is provided with one second and selects control port 198, for first selecting control port 219 to be connected with this, receives this selection signal.This control module 211 detects the selection signal of transmission on this first selection control port 219, and controls the circuit for detecting 125 of the plurality of output port 217 output reference current potential to corresponding connection according to this selection signal.Wherein, preferably, the plurality of output port 217 and this first selection control port 219 can be the IO interface be arranged on this main circuit 210, and this IO interface can select control port 198 to be connected with second of this load device 190 via a signal wire respectively.

This electronic installation 20 comprises a selection control module 240 further, this selection control module 240 provides the platform of a man-machine interaction, enables user utilize this platform to send instruction to set and still provide reference voltage by this load device 190 to this sense terminal 1251 by this electric supply installation 100.This selection control module 240 can be arranged at this electric supply installation 100 side or this load device 190 side, so that user's operation is as the criterion.Wherein, when this selection control module 240 is arranged in this load device 190, only have after this load device 190 starts, after being namely powered, user just can call this selection control module 240.Preferably, this selection control module 240 can show as the pattern of a screen display control inerface (OnScreenDisplay, OSD).When this selection control module 240 shows as an OSD pattern, it is arranged at the side possessing Presentation Function.As: when this electric supply installation 100 is a TV, this load device 190 is sound equipment when arranging, and this selection control module 240 is preferably disposed in this electric supply installation 100.

When this selection control module 240 is arranged in this electric supply installation 100, this electric supply installation 100 powers on, that is: this power circuit 110 is powered to this main circuit 210 and this selection control module 240.Now, user can call, operate this selection control module 240 sets and provides this reference potential by this electric supply installation 100 or this load device 190 to this sense terminal 1251, then this selection control module 240 correspondingly can send the control module 211 of a steering order to this main circuit 210, then this control module 211 exports corresponding selection signal respectively to the first selection control port 219 of this main circuit 210 and the second selection control port 198 of this load device 190, has informed this electric supply installation 100 and this load device 190.This control module 211 according to receive this selection signal control the plurality of output port 217 according to this steering order select whether export this reference potential to this sense terminal 1251, whether this load device 190 exports this reference potential to this sense terminal 1251 according to receiving this selection signal behavior simultaneously.

Particularly, when user's setting drives this voltage control unit 121 by this main circuit 210, this selection control module 240 sends steering order to this control module 211, this control module 211 controls the corresponding output one of this first selection control port 219 and shows to drive first of this voltage control unit 121 to select signal to this load device 190 by this main circuit 211, then this load device 190 is according to the action of this its internal switch unit 191 of the first selection signal shielding, and the control module 211 of this main circuit 210 controls the plurality of output port 217 and exports this reference potential to the sense terminal 1251 of corresponding voltage control circuit 120, thus make on-off circuit 123 conducting, realize driving this voltage control unit 121 to power to this load device 190 by this main circuit 210.

When user's setting sends reference potential to drive this voltage control unit 121 by this load device 190 side, this selection control module 240 sends another steering order to this control circuit 211, this control module 211 controls the corresponding output one of this selection control port 217 and shows to select signal to this load device 190 by this load device 190 to drive second of this voltage control unit 121, and this load device 190 is not shielded the switch element 191 of its inside.Simultaneously, this control module 211 shields the plurality of output port 217 according to this steering order, this main circuit 210 is made not provide this reference potential to this sense terminal 1251, and the reference potential of this sense terminal 1251 comes from the end to be detected 1913 of this load device 190, thus realize being driven by this load device 190 side realizing this power circuit 110 and powering to this load device 190.

When this selection control module 240 is arranged in this load device 190, this load unit 190 need first be activated, thus this selection control module 240 can be called and operation by user.After this, when user by call, operate this selection control module 240 set by this electric supply installation 100 or by this load device 190 to this sense terminal 1251 output reference current potential, then this selection control module 240 sends the microcontroller 194 of corresponding steering order to this load device 190, and this microcontroller 194 produces corresponding the second selection signal port 198 selecting signal to first of this main circuit 210 to select signal port 219 and this load unit 190 according to this steering order.The control module 211 of this main circuit 210 controls the plurality of output port 217 according to this selection signal and selects whether to export this reference potential to this sense terminal 1251.Whether this load unit 190 exports this reference potential to this sense terminal 1251 according to this selection signal behavior.

Particularly, this load device 190 is activated that (start-up course is the same, be not repeated) after, this reference potential is sent by this load device 190 side direction voltage control circuit 120 when user utilizes this selection control module 240 to set, then this selection control module 240 sends corresponding steering order to this microprocessor 194, this microprocessor 194 exports according to this steering order the first selection signal port 219 that this second selection signal to second of this load device 190 selects signal port 198 and this control module 211, then multiple output ports 217 conductively-closed of this main circuit 210, this reference potential is not provided to this sense terminal 1251, the reference potential of this sense terminal 1251 can only come from the end to be detected 1913 of this load device 190, thus realize being driven by this load device 190 side realizing this power circuit 110 and powering to this load device 190.

This reference potential is sent by this main circuit 210 to this voltage control circuit 120 when user utilizes this selection control module 240 to set, then this selection control module 240 sends corresponding steering order to this microprocessor 194, this microprocessor 194 exports this first selection signal according to this steering order and selects signal port 198 to second of this load device 190, and select signal port 219 to reach control module 211 by first of control module 211, this load device 190 is according to the action of this its internal switch unit 191 of the first selection signal shielding simultaneously, and the control module 211 of this main circuit 210 controls the plurality of output port 217 and exports this reference potential to the sense terminal 1251 of corresponding voltage control unit 121, thus make on-off circuit 123 conducting, realize driving this voltage control unit 121 to power to this load device 190 by this main circuit 210.

Wherein, see also Fig. 7, in this load device 190 side, realize function of shielding by this microcontroller 194.Specific as follows: this microcontroller 194 comprises a shielding control end 1945 further, this shielding control end 1945 is for detecting the selection signal on this second selection control port 198, when this shielding control end 1945 detects this first selection signal, this microcontroller 194 shields the output on its control output end 1943, now, no matter whether the control input end 1941 of this microcontroller 194 receives this feedback signal, this control output end 1943 does not all export and anyly controls signal to this lock-in circuit 197, this lock-in circuit 197 is made to be in open-circuit condition, this load device 190 cannot export this reference potential to this sense terminal 1251, thus realize function of shielding.

Refer to Fig. 8, in other change embodiment, in this load device 190 side, also realize shielding the action of its switch element 191 by arranging a shielding element 199 in load device 190, this shielding element 199 selects whether to shield the action of this switch element 191 by the selection signal detected on this second selection control port 198.Particularly, this shielding element 199 can be a normally closed switch of connecting with touch switch 1912, when this normally closed switch detect this second detecting control port 198 on for this first detection signal time, this normally closed switch ends, make this touch switch 1912 be in open-circuit condition, thus reach the effect of this switch element 191 action of shielding.Deformable ground, this shielding element 199 also can be arranged between output unit 195 and end to be detected 1913.Preferably, in this change embodiment, also function can be set as follows, when driving this voltage control unit by this main circuit 210, and user is when pressing again or touch this switch element 191, this selection control module 240 is detected the action (current potential as detection node P1) of this switch element 191 and is called a built-in reminding module, and the switch element 191 of prompting user's present load device 190 side is in masked state, the need of information such as change settings.

In electric supply installation 100 side, the output voltage (as: output high level) by changing this control module 211 realizes the effect shielding the output of multiple output port 217.In another variant embodiment, see Fig. 9, this main circuit 210 also comprises one or more gate-controlled switch 218 corresponding multiple voltage control unit 121 respectively.The plurality of output port 217 also can be the output terminal of multiple gate-controlled switch 218, and the input end of each gate-controlled switch 218 is connected with a reference potential (as: earthing potential), and the conducting of this gate-controlled switch 218 is controlled by this control module 211 with cut-off.When user by this selection control module 240 send instruction setting produce reference potential to this sense terminal 1251 by this main circuit 210 time, this control module 211 receives this first selection signal, this control module 211 controls the conducting of the plurality of gate-controlled switch 218, thus exports the to be detected end 1251 of this reference potential to corresponding voltage control circuit 120.Otherwise, when user by this selection control module 240 send instruction setting produce reference potential to this sense terminal 1251 by this main circuit 210 time, this control module 211 receives this second selection signal, this control module 211 controls the plurality of gate-controlled switch 218 to be ended, thus reaches the effect of the plurality of output port 217 output of shielding.

In this embodiment, user selects by selecting control module 240 power supply state still being controlled power circuit 110 by this electric supply installation 100 by this load device 190, increases the use dirigibility of this electronic installation 10 further.

Referring to Figure 10, is the circuit block diagram of electronic installation one of the present invention 3rd embodiment.For ease of describing, the element numbers continuing similar elements in the first embodiment is described the present embodiment, and, the annexation of the first voltage control unit 121 and the first load device 190 is only shown in Figure 10, should be appreciated that and can be applied to this second to N voltage control unit 121 and corresponding load device 190 thereof for this first voltage control unit 121 is same with the description of this first load device 190 below.This electronic installation 30 is substantially identical with the structure of the electronic installation 10 of the first embodiment, and difference is mainly:

Because be triggered time of conducting of switch element 191 is shorter, microcontroller 194 is likely caused not yet to power on, this switch element 191 has been in the situation of cut-off state, therefore, for ensureing after triggering starts, this microcontroller 194 can obtain enough trigger voltages and send lock control signal to this lock-in circuit 197, in the locking control module 192 of the present embodiment, be provided with at least one transient state lock cell 310 further.This transient state lock cell 310 is for compensating the lock control signal that is input to this lock-in circuit 197 or for compensating the reference voltage exported on end 1913 to be detected.This transient state lock cell 310 is optionally arranged on following three positions of this first load device 190: between the first output terminal 111 of power circuit 110 and the locking signal input end 1971 of lock-in circuit 197, between end to be detected 1913 and ground and between the first input end 1911 of this load device 190 and the locking signal input end 1971 of this lock-in circuit 197.Shown in this figure, three positions are provided with this transient state lock cell 310, are appreciated that in above three positions, at least one position need be provided with this transient stability unit 310.

Wherein, transient stability unit 310 between the locking signal input end 1971 being arranged at this first output terminal 111 and this lock-in circuit 197 goes back connected node P1, can be instantaneous in this switch element 191 conducting, the first DC voltage that this first output terminal 111 exports is stored, export the electric energy of this storage to this locking signal input end 1971 again, now, even if this microcontroller 194 fails to enter normal operating conditions because switch element 191 ON time is too short, this latch cicuit 197 also can be activated thus export the voltage consistent with this reference potential, thus maintain lasting this reference potential of output of this end 1913 to be detected, until this microcontroller 194 obtains enough power-on times or voltage and starts normal work, complete transient state locking process.After this, this microcontroller 194 starts output latch control signal to this latch cicuit 197, enters stable state locking process.

Be arranged at the transient stability unit 310 between this end 1913 to be detected and ground, can be instantaneous in this switch element 191 conducting, the reference potential exported via this output unit 195 is kept in, and export this temporary current potential to this end 1913 to be detected, thus extend the time that this end 1913 to be detected exports this reference potential, make this microcontroller 194 can obtain enough power-on times and then start normal work, completing transient state locking process.After this, this microcontroller starts output latch control signal to this latch cicuit 197, enters stable state locking process.Wherein, this transient stability unit 310 can be a memory capacitance (not shown).

Be arranged at the transient state lock cell 310 between the first input end 1911 of this load device 190 and the locking signal input end 1971 of this lock-in circuit 197, can by instantaneous for this switch element 191 conducting, the first DC voltage exported via this first output terminal 1911 stores, export the electric energy of this storage to this locking signal input end 1971 again, now, even if this microcontroller 194 fails to enter normal operating conditions because switch element 191 ON time is too short, this latch cicuit 197 also can be activated thus export the voltage consistent with this reference potential, and then maintain lasting this reference potential of output of this end 1913 to be detected, until this microcontroller 194 obtains enough power-on times or voltage and starts normal work, complete transient state locking process.After this, this microcontroller 194 starts output latch control signal to this latch cicuit 197, enters stable state locking process.

Refer to Figure 11, for being applicable to the particular circuit configurations of a kind of embodiment of the transient stability circuit 310 be arranged between the locking signal input end 1971 of this first output terminal 111 and this lock-in circuit 197.This transient stability circuit 310 comprises a transistor Q11, a memory capacitance C11 and a bleeder circuit 311.This bleeder circuit 311 can be made up of series resistance.This transistor Q11 comprises a control end G11, a first end S11 and one second end D11.On node between the resistance in series that this control end G11 is connected to this bleeder circuit 311, this first end S11 is connected with one end of this bleeder circuit 311, for receiving the DC voltage as this first DC voltage, this second end D11 is via this memory capacitance C11 ground connection.One end that this memory capacitance C11 is connected with this second end D11 is as the output terminal of this transient stability circuit 310, and the electric energy for exporting this memory capacitance C11 exports this locking signal input end 1971 to.The other end of this bleeder circuit 311 is via this touching switch 1912 ground connection.When this touching switch 1912 is touched or when pressing, this transistor Q11 conducting, this first DC voltage is charged to this memory capacitance C11 via the transistor Q11 of this conducting, when this touching switch 1912 turns off, this transistor Q11 ends, this memory capacitance C11 discharges, and the electric energy of release is sent to the locking signal input end 1971 of this lock-in circuit 197, realizes the function of transient stability.This transient stability circuit 310 can also comprise further for preventing the diode misleaded.

Refer to Figure 12, for being suitable for the particular circuit configurations of a kind of embodiment of the transient stability circuit 310 be arranged between the first input end 1911 of this load device 190 and the locking signal input end 1971 of this lock-in circuit 197.This transient stability circuit 310 is a positive feedback circuit, comprises one and is connected to the diode string 321 between this locking signal input end 1971 and this first input end 1911 and the memory capacitance C21 between the node be connected between this diode string 321 and ground.This diode string 321 comprises diode D21, D22 of two series connection, this memory capacitance C21 is connected with this locking signal input end 1971 via the negative electrode of this diode D22, anode successively, and this first DC voltage that this first input end 1911 exports is successively via the anode of this diode D21, negative electrode and this memory capacitance C21 ground connection.When this switch element 191 is by touch-control during conducting, open-circuit condition is in because this microcontroller 194 not yet can start this diode string 321, therefore this first DC voltage starts charging by diode D21 to this memory capacitance C21, after charging, this memory capacitance C21 starts the locking signal input end 1971 being discharged to this lock-in circuit 197, realizes the function of transient stability.This transient stability circuit 310 can also comprise further for preventing the diode D23 misleaded, and the plus earth of this diode D23, negative electrode is connected with the anode of this diode D22.

Referring to Figure 13, is the circuit module figure of another variant embodiment of electronic installation of the present invention.In this embodiment, the first input end 1911 of this load device 190 is inputted after the first DC voltage exported from this electric supply installation 100 eliminates crosstalk via a buffer circuit 410.

Application example:

Referring to Figure 14, is the circuit module figure of an above-mentioned electronic installation wherein application example.For a better understanding of the present invention, utilizing this electronic installation to be a PC below, is namely that an application example illustrates using main frame and liquid crystal display as electric supply installation 100 with load device 190.Simultaneously, can notice, be main frame as electric supply installation 100 owing to providing a side of operating voltage for this liquid crystal display, therefore liquid crystal display in the present embodiment is different from traditional liquid crystal display, that eliminate the power supply unit being originally arranged at this liquid crystal display inside, and originally for this main frame provides the power circuit of operating voltage to be LCD device electric supply simultaneously.

Be appreciated that, liquid crystal display comprises panel driving and backlight drive two parts, required driving DC voltage is not identical yet, the liquid crystal display pretended as this load device 190 possesses at least two sub-load unit 190a and 190b, correspondingly, the voltage control circuit 120 of this main frame also needs to comprise one and drives the first Control of Voltage subelement 121a and of the first DC voltage needed for this panel for controlling to export the second Control of Voltage subelement 121b of the second DC voltage driven needed for this backlight for controlling to export, and each Control of Voltage subelement adopts voltage control circuit 120 in the various embodiments described above.

Simultaneously, because user is that switch control by pressing or touch this liquid crystal display realizes the startup of liquid crystal display and shutoff, this switch control is as the switch element 191 of this liquid crystal display, therefore be appreciated that, only need be started and the load device 190 turned off by a switch element 191 by multiple direct voltage drive for such as liquid crystal display and so on, when this switch element 191 triggering and conducting, for producing multiple Control of Voltage subelement 121a of the plurality of DC voltage respectively, reference potential on the detecting unit 125 of 121b can from same end 1913 to be detected, correspondingly, also only need to arrange a locking control module 192, more optimize to make circuit structure.Certainly, this reference potential also can from different ends to be detected 1913.

When the main frame of this PC is as this electric supply installation 10, when liquid crystal display is as this load device 190, first this PC is connected with this liquid crystal display, to transmit all kinds of control signal by interface, signal wire (as video signal cable).When this PC and this liquid crystal display are not activated, the two is in virtual connection state.Wherein, this main circuit 210 can be arranged on the mainboard of this main frame.This control module 211 can be the micro-processor interface circuit of this main frame, and the output port of this main circuit 217 and first selects control port 219 to be the terminal of the IO interface of this PC.This liquid crystal display is provided with the IO interface be connected with this PC accordingly, this main frame and this liquid crystal display are selected via this first, second control port to transmit via this IO interface and are selected signal.The power-supplying circuit that work required voltage is provided that this power circuit 110 is this PC.When user starts this PC, this power circuit 110 provides DC voltage to each module of this PC, and this main circuit 211 is started working.Be arranged on the control of the switch control on this LCD outer frame as this switch element 191 conducting of triggering.

This liquid crystal display comprises panel 80 and a backlight 90, and drives panel driving 81 and the backlight drive 91 of this panel 80 and backlight 90 respectively, and wherein, this backlight drive 91 and this panel driving 81 need receive different DC voltage respectively as operating voltage.This backlight drive 91 is respectively this first load device 190a and this second load device 190b with this panel driving 81.This first load device 190a comprises this switch element 191 and this latch control module 192.This switch element 191 can be one of the respective embodiments described above of the present invention with the structure of this latch control device 192, is not repeated.Meanwhile, after microcontroller 194 startup of this latch control module 192, this panel driving 81 is also output control signals to.This second load device 190b comprises a backlight drive 91, its receive from host computer side power circuit 110 export the second DC voltage to drive backlight 90.In this application example, because this liquid crystal display can show image, therefore select control module 240 to be preferably disposed in this liquid crystal display, and realized by the setting of the OSD of this liquid crystal display inside.Certainly, according to the description of above-described embodiment, can naturally understand, this selection control module 240 also can be arranged in this main frame.

Because this main frame and this liquid crystal display can be electric supply installation and the load device of the respective embodiments described above, therefore the powered operation principle of this PC and above-mentioned electronic installation are also very similar, therefore are not repeated.In addition, due in circuit design, for avoiding the signal disturbing inputted between two DC voltage of this panel driving 81 and this backlight drive 91, be connected one first buffer circuit 410a at the first input end 1911 of this backlight drive 91 with between this first Control of Voltage subelement 121a.Further, because this panel driving 81 is connected in analog, and this backlight drive is connected on a signal ground, and the two easily produces crosstalk, for avoiding this phenomenon, also can arrange one second buffer circuit 420b between backlight drive 91 and panel driving 81.

Claims

1. an electronic installation, comprising:

One electric supply installation and at least one load device, this electric supply installation comprises a power circuit, this power circuit provides the operating voltage needed for work for this electric supply installation and this at least one load device, the alternating voltage that one external circuit inputs by this power circuit is converted at least one DC voltage, and this at least one load device receives this at least one DC voltage and normally works;

It is characterized in that: this electric supply installation comprises at least one voltage control unit further, this at least one voltage control unit is connected between this power circuit and this at least one load device, and whether foundation receives the reference potential from this at least one load device, controls this power circuit and optionally exports this at least one DC voltage to this at least one load device, this at least one load device comprises a switch element, this switch element is connected between this reference potential and this voltage control unit, and according to user to the control of this switch element, this reference potential is optionally provided to this voltage control unit, when this reference potential exports this voltage control unit to via this switch element, this voltage control unit controls this power circuit and exports this at least one DC voltage to this at least one load device, when this reference potential does not export this voltage control unit to via this switch element, this voltage control unit controls this power circuit to be stopped exporting this at least one DC voltage,

This power circuit comprises an output terminal for exporting this at least one DC voltage, this at least one load device comprises an input end, for receiving this at least one DC voltage, this at least one voltage control unit comprises a circuit for detecting and an on-off circuit, this on-off circuit is connected between the output terminal of this power circuit and the input end of this at least one load device, this circuit for detecting via an end to be detected detecting from the reference potential of this at least one load device to control conducting and the shutoff of this on-off circuit, when this circuit for detecting detects this reference potential, control this on-off circuit conducting, this power circuit exports this at least one DC voltage by the on-off circuit of this conducting, when this circuit for detecting does not detect this reference potential, control this on-off circuit and turn off, this power circuit stops exporting this at least one DC voltage to this at least one load device,

This at least one load device comprises an output unit further, this output unit is connected between this switch element and circuit for detecting of this voltage control unit, this at least one load device be not loaded this at least one DC voltage and this switching means conductive time, this reference potential is sent to the circuit for detecting of this voltage control unit via this output unit;

This switch element is a touch-type switch, often presses or touch this touch-type switch once, and this touch-type switch conduction once;

This at least one load device comprises a locking control module further, this locking control module is connected between this switch element and this circuit for detecting, whether receive this reference potential to select whether to maintain for detecting and transmit this reference potential to this circuit for detecting, when this locking control module does not receive this reference potential, this locking control module exports a current potential identical with this reference potential phase place to this circuit for detecting, to maintain this reference potential of transmission to this circuit for detecting; Otherwise, when this locking control module receives this reference potential, this locking control module controls this reference potential to be stopped exporting this voltage control unit to, and this voltage control unit controls this power circuit to be stopped providing this at least one DC voltage to this at least one load device.

2. electronic installation as claimed in claim 1, it is characterized in that: this locking control module comprises a microcontroller, a feedback branch and a lock-in circuit, this feedback branch is connected between this microcontroller and the node between this switch element and this output unit, for load this at least one DC voltage at least one load device and this switching means conductive time, this switch element, this feedback branch and this microcontroller form primary Ioops, and this reference potential is supplied to this microcontroller via this loop; This microcontroller is provided this at least one DC voltage at this at least one load device and starts normal work, whether receives this reference potential from this loop thus export corresponding control signal to this lock-in circuit for detecting; This lock-in circuit judges whether to maintain according to the control signal sent by this microcontroller received and transmits this reference potential to this circuit for detecting.

3. electronic installation as claimed in claim 2, it is characterized in that: the control signal that this microcontroller sends comprises a lock control signal and and cancels lock control signal, this lock-in circuit comprises a locking signal input end for receiving this control signal, when this lock-in circuit receives this lock control signal, the current potential that then this lock-in circuit output one is identical with this reference potential phase place is to this circuit for detecting, when this lock-in circuit receives this cancellation lock control signal, then this lock-in circuit is in open-circuit condition.

4. electronic installation as claimed in claim 3, it is characterized in that: this locking control module comprises at least one transient stability circuit further, this transient stability circuit is for compensating the control signal being input to this lock-in circuit, and this transient stability circuit is optionally arranged at following three positions at least on one of them: between the locking signal input end of the output terminal of this power circuit and this lock-in circuit, between this end to be detected and ground and between the input end of this at least one load device and the locking signal input end of this lock-in circuit.

5. electronic installation as claimed in claim 4, it is characterized in that: this transient stability circuit comprises a transistor, one memory capacitance and a bleeder circuit, this bleeder circuit comprises one point of pressure side, this transistor comprises a control end, one first end and one second end, this control end is connected to point pressure side of this bleeder circuit, this first end is connected with one end of this bleeder circuit, this second end is via this memory capacitance ground connection, and one end of being connected with this second end of this memory capacitance is as the output terminal of this transient stability circuit, for exporting the electric energy of this memory capacitance to this locking signal input end, the other end of this bleeder circuit is via this switch element ground connection.

6. electronic installation as claimed in claim 4, it is characterized in that: this transient stability circuit comprises the diode string between an input end being connected to this locking signal input end and this load device, and one is connected to the memory capacitance between node between this diode string and ground, this diode string comprises the diode of two series connection, this memory capacitance is successively via the negative electrode of one of them diode, anode is connected with this locking signal input end, this DC voltage that the input end of this load device exports is successively via the anode of another diode, negative electrode and this memory capacitance ground connection.

7. electronic installation as claimed in claim 5, is characterized in that: comprise a buffer circuit further between the input end of this electric supply installation and this at least one load device.

8. electronic installation as claimed in any of claims 1 to 7 in one of claims, it is characterized in that: this electric supply installation is a main frame, this at least one load device is a display.

9. an electronic installation, comprising:

One electric supply installation and at least one load device, this electric supply installation comprises a power circuit, and the alternating voltage that external circuit exports by this power circuit is converted at least one DC voltage, and this at least one load device receives this at least one DC voltage and normally works, it is characterized in that: this electric supply installation comprises at least one voltage control unit and a main circuit further, this at least one voltage control unit is connected between this power circuit and this at least one load device, this at least one voltage control unit comprises a sense terminal, this sense terminal is used for detecting and whether receives a reference potential, and this at least one voltage control unit controls this power circuit and exports this at least one DC voltage to this at least one load device when receiving this reference potential, this main circuit comprises one first and selects control port, this the first selection control port shows still to provide reference potential to the selection signal of this sense terminal by this at least one load device by this electric supply installation for receiving one, and this main circuit can export this reference potential to this sense terminal according to this selection signal-selectivity received, this at least one load device comprise a switch element with one with this first select control port to be connected second select control port, this switch element is connected between this reference potential and this voltage control unit, and according to user to the control of this switch element, this reference potential is optionally provided to this sense terminal, this electronic installation comprises a selection control module further, the instruction that this selection control module sends according to user produces this selection signal respectively to this main circuit and this at least one load device, when user's setting provides this reference potential by this electric supply installation to this sense terminal, this reference potential is produced to this sense terminal by this main circuit, this at least one load device shielding exports this reference potential, when user's setting provides this reference potential by this at least one load device to this sense terminal, this reference potential is produced to this sense terminal by this at least one load device, the shielding of this main circuit exports this reference potential.

10. electronic installation as claimed in claim 9, is characterized in that: this selection control module is arranged at this electric supply installation and this at least one load device in one of them.

11. electronic installations as claimed in claim 9, it is characterized in that: this main circuit comprises a control module and at least one output port further, this at least one output port is connected to this sense terminal respectively, and this control module controls to select whether export this reference potential to this sense terminal according to via this first this selection signal selecting control port to input.

12. electronic installations as claimed in claim 11, is characterized in that: this at least one output port and at least one first selection control port are the lead-out terminal of an IO interface of this electric supply installation.

13. electronic installations as claimed in claim 11, it is characterized in that: this main circuit comprises at least one gate-controlled switch further, this at least one gate-controlled switch is connected between a reference potential and this sense terminal, and this control module is according to the conducting and the cut-off that control this gate-controlled switch via this first this selection signal selecting control port to input.

14. electronic installations as claimed in claim 9, is characterized in that: this at least one load device comprises a shielding element further, and this shielding element selects whether to shield the action of this switch element by the selection signal detected on this second selection control port.

15. electronic installations as claimed in claim 14, it is characterized in that: this shielding element is a normally closed switch of connecting with this switch element, when this shielding element detect via this second select the selection signal on control port to show to provide this reference potential by this electric supply installation time, this normally closed switch is by opening.

16. electronic installations as claimed in claim 9, it is characterized in that: this at least one load device comprises an output unit further, this output unit is connected between this switch element and a circuit for detecting of this voltage control unit, this at least one load device be not loaded this at least one DC voltage and this switching means conductive time, this reference potential is sent to the circuit for detecting of this voltage control unit via this output unit.

17. electronic installations as claimed in claim 16, it is characterized in that: this at least one load device comprises a microcontroller, a feedback branch and a lock-in circuit further, this feedback branch is connected between this microcontroller and the node between this switch element and this output unit, for load this at least one DC voltage at least one load device and this switching means conductive time, this switch element, this feedback branch and this microcontroller form primary Ioops, and this reference potential is supplied to this microcontroller as a feedback signal via this loop; This microcontroller is provided this at least one DC voltage at this at least one load device and starts normal work, whether receives this feedback signal from this loop thus export corresponding control signal to this lock-in circuit for detecting; This lock-in circuit judges whether to maintain according to the control signal sent by this microcontroller received and transmits this reference potential to this circuit for detecting.

18. electronic installations as claimed in claim 17, it is characterized in that: this microcontroller comprises a control input end, one control output end and a shielding control end, this control input end is for receiving this feedback signal exported by this feedback branch, this control output end controls signal to this lock-in circuit for exporting this, whether the detecting of this microcontroller receives the control signal that this feedback signal controls to export via this control output end, this shielding control end is for detecting the selection signal on this second selection control port, when this shielding control end detect the selection signal received show user set provide this reference potential by this electric supply installation time, this microcontroller shields the output on this control output end, this lock-in circuit is opened a way.

19., as the electronic installation in claim 9 to 18 as described in any one, is characterized in that: this electric supply installation is a main frame, and this at least one load device is a display.

20. 1 kinds of PC, comprising:

One main frame; And

The display be connected with this main frame;

It is characterized in that: this main frame comprises a power circuit, this power circuit provides the operating voltage needed for work for this main frame, an alternating voltage of an external circuit input is converted to the DC voltage needed for this display work simultaneously; This display comprises an input end, and this input end is for receiving this DC voltage thus making this display normally work; This main frame comprises at least one voltage control unit further, this at least one voltage control unit is connected between this power circuit and input end of this display, and whether foundation receives the reference potential from this display, controls this power circuit and optionally exports the input end of this DC voltage to this display; This display comprises the switch element be connected with a reference potential, user controls this reference potential by the conducting triggering this switch element and is optionally provided to this at least one voltage control unit, when this reference potential exports this at least one voltage control unit to via this switch element, this at least one voltage control unit controls this power circuit and exports this DC voltage to this display, when this reference potential does not export this voltage control unit to, this voltage control unit controls this power circuit to be stopped exporting this DC voltage;

This display comprises one first load subelement and one second load subelement, this the first load subelement comprises a first input end in order to receive the DC voltage needed for this first load subelement, this the second load subelement comprises one second input end in order to receive the DC voltage needed for this second load subelement, the voltage control unit of this main frame comprises this power circuit of a control provides the second Control of Voltage subelement of DC voltage for this first load subelement provides the first Control of Voltage subelement and of DC voltage to control this power circuit for this second load subelement, this first and second Control of Voltage subelement controls this power circuit optionally export corresponding DC voltage to this first and second load subelement according to whether receiving this reference potential.

21. PC as claimed in claim 20, is characterized in that: be arranged on the control of the switch control on this display outer frame as this switching means conductive of triggering.

22. PC as claimed in claim 20, is characterized in that: this display comprises an end to be detected, and this first Control of Voltage subelement and this second Control of Voltage subelement detect this reference potential from this end to be detected.

23. PC as claimed in claim 22, it is characterized in that: this first Control of Voltage subelement and this second Control of Voltage subelement comprise a circuit for detecting and an on-off circuit respectively, the on-off circuit of two Control of Voltage subelements is connected between first and second input end of this power circuit and this first and second load subelement, each circuit for detecting comprises a sense terminal, whether the detecting of this circuit for detecting has this reference potential to be loaded on this corresponding sense terminal to control conducting and the shutoff of corresponding on-off circuit, when this circuit for detecting detects this reference potential, control corresponding on-off circuit conducting, this power circuit exports this DC voltage to corresponding Control of Voltage subelement by the on-off circuit of this conducting, when this circuit for detecting does not detect this reference potential, control this on-off circuit and turn off, this power circuit stops exporting this DC voltage to this Control of Voltage subelement corresponding.

24. PC as claimed in claim 22, it is characterized in that: this main frame comprises a control module, one first output port selected control port and be connected with the sense terminal of this circuit for detecting respectively further, this the first selection control port shows still to provide reference potential to the selection signal of this sense terminal by this display by this main frame for receiving one, this control module receives this selection signal, and controls this output port according to this selection signal and whether export this reference potential.

25. PC as claimed in claim 24, it is characterized in that: this display comprise further with this first select control port to be connected second select control port, this display second selects this selection signal that control port loads to control whether provide this reference potential by the end to be detected of this display according to this.

26. PC as claimed in claim 24, it is characterized in that: this PC comprises a selection control module further, this selection control module produces this selection signal according to the instruction that user sends and selects control port to first and second of this main frame and display respectively, when user's setting provides this reference potential by this main frame to this sense terminal, this reference potential is produced to this sense terminal by the output port of this main frame, the shielding of this display exports this reference potential, when user's setting provides this reference potential by this display to this sense terminal, produce this reference potential by this display and be sent to this sense terminal respectively via this end to be detected, the shielding of this control module exports this reference potential.

27. PC as claimed in claim 22, it is characterized in that: one of them of this first load subelement and this second load subelement comprises a locking control module and an output unit, this output unit is connected between this switch element and this reference potential, this display be not loaded this DC voltage and this switching means conductive time, this reference potential is sent to end to be detected via this output unit, this locking control module is connected between this switch element and this end to be detected, whether receive this reference potential to select whether to maintain for detecting and transmit this reference potential to this end to be detected, when this locking control module does not receive this reference potential, this locking control module exports a current potential identical with this reference potential phase place to this circuit for detecting, this reference potential is transmitted to this end to be detected to maintain, otherwise when this locking control module receives this reference potential, this locking control module controls this reference potential to be stopped being loaded on this end to be detected.

28. PC as claimed in claim 27, it is characterized in that: this locking control module comprises a microcontroller, a feedback branch and a lock-in circuit, this feedback branch is connected between this microcontroller and the node between this switch element and this output unit, for load this DC voltage at this display and this switching means conductive time, this switch element, this feedback branch and this microcontroller form primary Ioops, and this reference potential is supplied to this microcontroller via this loop; This microcontroller is provided this DC voltage at this main frame and starts normal work, whether receives this reference potential from this loop thus export corresponding control signal to this lock-in circuit for detecting; This lock-in circuit judges whether to maintain according to the control signal sent by this microcontroller received and transmits this reference potential to this end to be detected.

29. PC as claimed in claim 28, it is characterized in that: the control signal that this microcontroller sends comprises a lock control signal and and cancels lock control signal, this lock-in circuit comprises a locking signal input end for receiving this control signal, when this lock-in circuit receives this lock control signal, the current potential that then this lock-in circuit output one is identical with this reference potential phase place is to this circuit for detecting, when this lock-in circuit receives this cancellation lock control signal, then this lock-in circuit is in open-circuit condition.

30. PC as claimed in claim 29, it is characterized in that: this locking control module comprises at least one transient state lock cell further, this transient state lock cell is for compensating the control signal being input to this lock-in circuit, and this transient state lock cell is optionally arranged at following three positions at least on one of them: between the locking signal input end of the output terminal of this power circuit and this lock-in circuit, between this end to be detected and ground and between the input end of this at least one load device and the locking signal input end of this lock-in circuit.

31. PC as claimed in claim 29, it is characterized in that: this display comprises one second further and selects control port, this microcontroller comprises a control input end, one control output end and a shielding control end, this control input end is for receiving this feedback signal exported by this feedback branch, this control output end controls signal to this lock-in circuit for exporting this, whether the detecting of this microcontroller receives the control signal that this feedback signal controls to export via this control output end, this shielding control end is for detecting the selection signal on this second selection control port, when this shielding control end detect the selection signal received show user set provide this reference potential by an electric supply installation time, this microcontroller shields the output on this control output end, this lock-in circuit is opened a way.

32. PC as claimed in claim 20, it is characterized in that: one first buffer circuit is set between the first input end and this first Control of Voltage subelement of this first load subelement, one second buffer circuit is set between this first load subelement and the second load subelement.

33. 1 kinds of electronic installations, this electronic installation can provide operating voltage at least one load device, and this at least one load device and this electronic installation are independently arranged, and is connected via at least one cable, and this electronic installation comprises:

One power circuit, the alternating voltage that external circuit exports by this power circuit is converted at least one DC voltage, and this at least one load device receives this at least one DC voltage and normally works;

It is characterized in that: this electronic installation comprises at least one voltage control unit and a main circuit further, this at least one voltage control unit is connected between this power circuit and this at least one load device, this at least one voltage control unit comprises a sense terminal, this sense terminal is used for detecting and whether receives a reference potential, and this at least one voltage control unit controls this power circuit and exports this at least one DC voltage to this at least one load device when receiving this reference potential; This main circuit comprises one first and selects control port, this the first selection control port shows still to provide reference potential to the selection signal of this sense terminal by this at least one load device by this main circuit for receiving one, and this main circuit can export this reference potential to this sense terminal according to this selection signal-selectivity received;

This at least one load device comprise a switch element with one with this first select control port to be connected second select control port, this switch element is connected between this reference potential and this voltage control unit, and according to user to the control of this switch element, this reference potential is optionally provided to this sense terminal;

This electronic installation comprises a selection control module further, the instruction that this selection control module sends according to user produces this selection signal respectively to this main circuit and this at least one load device, when user's setting provides this reference potential by this main circuit to this sense terminal, produce this reference potential to this sense terminal by this main circuit, this at least one load device shielding exports this reference potential; When user's setting provides this reference potential by this at least one load device to this sense terminal, produce this reference potential to this sense terminal by this at least one load device, the shielding of this main circuit exports this reference potential.

34. electronic installations as claimed in claim 33, it is characterized in that: this main circuit comprises a control module and at least one output port further, this at least one output port is connected to this sense terminal respectively, and this control module controls to select whether export this reference potential to this sense terminal according to via this first this selection signal selecting control port to input.

35. electronic installations as claimed in claim 34, it is characterized in that: this main circuit comprises at least one gate-controlled switch further, this at least one gate-controlled switch is connected between a reference potential and this sense terminal, and this control module is according to the conducting and the cut-off that control this gate-controlled switch via this first this selection signal selecting control port to input.

36., as the electronic installation in claim 33 to 35 as described in any one, is characterized in that: this electronic installation is a main frame.

37. electronic installations as claimed in claim 36, is characterized in that: this at least one load device is a display.

38. 1 kinds of main frames, it provides operating voltage for a display, and this display is connected with this main frame, and user produces a reference potential to this main frame by the switch control touching this display, this display comprises one for receiving a DC voltage thus making the input end that this display normally works

It is characterized in that: this main frame comprises a power circuit, this power circuit provides the operating voltage needed for work for this main frame, an alternating voltage of an external circuit input is converted to the DC voltage needed for this display work simultaneously; This main frame comprises at least one voltage control unit further, this at least one voltage control unit is connected between this power circuit and input end of this display, and whether foundation receives the reference potential from this display, controls this power circuit and optionally exports the input end of this DC voltage to this display; When this reference potential exports this at least one voltage control unit to via this switch control, this at least one voltage control unit controls this power circuit and exports this DC voltage to this display, when this reference potential does not export this voltage control unit to, this voltage control unit controls this power circuit to be stopped exporting this DC voltage;

The voltage control unit of this main frame comprises the second Control of Voltage subelement that panel that this power circuit of a control is this display provide the first Control of Voltage subelement and of DC voltage to control backlight that this power circuit is this display provides DC voltage, and this first and second Control of Voltage subelement controls this power circuit optionally export corresponding DC voltage to this display according to whether receiving this reference potential.

39. main frames as claimed in claim 38, it is characterized in that: this display comprises one first load subelement and one second load subelement, this the first Control of Voltage subelement and this second Control of Voltage subelement comprise a circuit for detecting and an on-off circuit respectively, the on-off circuit of two Control of Voltage subelements is connected between this power circuit and one first and 1 second input end of this first and second load subelement, each circuit for detecting comprises a sense terminal, whether the detecting of this circuit for detecting has this reference potential to be loaded on this sense terminal corresponding to control conducting and the shutoff of corresponding on-off circuit, when this circuit for detecting detects this reference potential, control corresponding on-off circuit conducting, this power circuit exports this DC voltage to corresponding Control of Voltage subelement by the on-off circuit of this conducting, when this circuit for detecting does not detect this reference potential, control this on-off circuit and turn off, this power circuit stops exporting this DC voltage to this Control of Voltage subelement corresponding.

40. main frames as claimed in claim 39, it is characterized in that: this main frame comprises a control module, one first output port selected control port and be connected with the sense terminal of this circuit for detecting respectively further, this the first selection control port shows still to provide reference potential to the selection signal of this sense terminal by this display by this main frame for receiving one, this control module receives this selection signal, and controls this output port according to this selection signal and whether export this reference potential.

41. 1 kinds of displays be connected with main frame according to claim 38, it is characterized in that: this display comprises a switch element, this switch element is connected between this reference potential and this voltage control unit, and according to user to the control of this switch element, this reference potential is optionally provided to this voltage control unit;

This display comprises one first load subelement and one second load subelement, one of them of this first load subelement and this second load subelement comprises a locking control module, one output unit and one is for transmitting the to be detected end of reference potential at least one voltage control unit of this main frame, this output unit is connected between this switch element and this reference potential, this display be not loaded this DC voltage and this switching means conductive time, this reference potential is sent to end to be detected via this output unit, this locking control module is connected between this switch element and this end to be detected, whether receive this reference potential to select whether to maintain for detecting and transmit this reference potential to this end to be detected, when this locking control module does not receive this reference potential, this locking control module exports a current potential identical with this reference potential phase place to this circuit for detecting, this reference potential is transmitted to this end to be detected to maintain, otherwise when this locking control module receives this reference potential, this locking control module controls this reference potential to be stopped being loaded on this end to be detected.

42. displays as claimed in claim 41, it is characterized in that: this display comprises one second further and selects control port, this second selection control port shows still to provide the selection signal of reference potential to this end to be detected by this display by this main frame for receiving one.

43. displays as claimed in claim 42, it is characterized in that: this display comprises a selection control module further, this selection control module produces this selection signal according to the instruction that user sends and selects control port to second of this display, when user's setting is provided this reference potential by this main frame, the shielding of this display exports this reference potential, when user's setting is provided this reference potential by this display, produce this reference potential to this end to be detected by this display.

44. displays as claimed in claim 41, it is characterized in that: one of them of this first load subelement and this second load subelement comprises a locking control module and an output unit, this output unit is connected between this switch element and this reference potential, this display be not loaded this DC voltage and this switching means conductive time, this reference potential is sent to end to be detected via this output unit, this locking control module is connected between this switch element and this end to be detected, whether receive this reference potential to select whether to maintain for detecting and transmit this reference potential to this end to be detected, when this locking control module does not receive this reference potential, this locking control module exports a current potential identical with this reference potential phase place to this circuit for detecting, this reference potential is transmitted to this end to be detected to maintain, otherwise when this locking control module receives this reference potential, this locking control module controls this reference potential to be stopped being loaded on this end to be detected.

45. displays as claimed in claim 44, it is characterized in that: this locking control module comprises a microcontroller, a feedback branch and a lock-in circuit, this feedback branch is connected between this microcontroller and the node between this switch element and this output unit, for load this DC voltage at this display and this switching means conductive time, this switch element, this feedback branch and this microcontroller form primary Ioops, and this reference potential is supplied to this microcontroller via this loop; This microcontroller is provided this DC voltage at this main frame and starts normal work, whether receives this reference potential from this loop thus export corresponding control signal to this lock-in circuit for detecting; This lock-in circuit judges whether to maintain according to the control signal sent by this microcontroller received and transmits this reference potential to this end to be detected.

46. displays as claimed in claim 45, it is characterized in that: this locking control module comprises at least one transient state lock cell further, this transient state lock cell is for compensating the control signal being input to this lock-in circuit, and this transient state lock cell is optionally arranged at following three positions at least on one of them: between the locking signal input end of the output terminal of this power circuit and this lock-in circuit, between this end to be detected and ground and between the input end of this display and the locking signal input end of this lock-in circuit.

47. displays as claimed in claim 45, it is characterized in that: this display comprises one second further and selects control port, this microcontroller comprises a control input end, one control output end and a shielding control end, this control input end is for receiving this feedback signal exported by this feedback branch, this control output end controls signal to this lock-in circuit for exporting this, whether the detecting of this microcontroller receives the control signal that this feedback signal controls to export via this control output end, this shielding control end is for detecting the selection signal on this second selection control port, when this shielding control end detect the selection signal received show user set provide this reference potential by an electric supply installation time, this microcontroller shields the output on this control output end, this lock-in circuit is opened a way.