CN105119490A - Voltage-current dual output control circuit, constant-voltage constant-current power supply and display device - Google Patents
Voltage-current dual output control circuit, constant-voltage constant-current power supply and display device Download PDFInfo
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Abstract
The invention discloses a voltage-current dual output control circuit, which comprises a voltage sampling unit, a current sampling unit and an output switching unit, wherein an input end of the voltage sampling unit is used for acquiring voltage signals, an input end of the current sampling unit is used for acquiring current signals, and an output end of the voltage sampling unit and an output end of the current sampling unit are combined into a public output end; the output switching unit outputs a first control signal to the voltage sampling unit and outputs a second control signal to the current sampling unit simultaneously, controls the voltage sampling unit and the current sampling unit to operate in an alternative manner, and achieves the alternative output of the sampled voltage signals and current signals. The invention further discloses a constant-voltage constant-current power supply and a display device thereof. The voltage-current dual output control circuit achieves the alternative output of the voltage signals and the current signals, and has no time difference in the alternative output.
Description
Technical field
The present invention relates to control circuit field, particularly relate to a kind of electric current and voltage dual output control circuit and constant voltage constant current power, display unit.
Background technology
Along with the development of electronic equipment and the increase of complexity, the unit module of complete machine inside gets more and more, to such an extent as to many electronic equipments need multiple power supply, for meeting the demand of above-mentioned electronic equipment to power supply, people devise the power electronic equipment system of the dual output of electric current and voltage.And described in there is the dual output function of electric current and voltage power electronic equipment system often need control circuit to realize its dual output function.
Existing electric current and voltage dual output control circuit comprises voltage output control circuit, electric current output control circuit.When needs output voltage signal, voltage output control circuit conducting, electric current output control circuit disconnects, and makes described electric power system output voltage signal.When needs output current signal, the conducting of electric current output control circuit, voltage output control circuit disconnects, and makes described electric power system output current signal.
Although foregoing circuit structure can realize the function of voltage signal and the dual output of current signal, but due to the voltage output control circuit in this circuit structure and electric current output control circuit separate, therefore in the process of alternating voltage output signal and current signal, have the time difference.
Summary of the invention
Main purpose of the present invention is to provide a kind of electric current and voltage dual output control circuit and constant voltage constant current power, display unit, is intended to realize described electric current and voltage dual output control circuit alternately exporting in the voltage and current signal process of sampling, does not have the time difference.
For achieving the above object, the invention provides a kind of electric current and voltage dual output control circuit, described electric current and voltage dual output control circuit comprises voltage sampling unit, current sampling unit, output switching unit.
The input of described voltage sampling unit is for gathering voltage signal, and the input of described current sampling unit is for gathering current signal, and the output of described voltage sampling unit and the output of current sampling unit merge into public output;
Described output switching unit exports first and controls signal to described voltage sampling unit, and output second controls signal to described current sampling unit simultaneously, controls described voltage sampling unit and the work of current sampling units alternately.
Preferably, described voltage sampling unit comprises the first resistance, the second resistance, the first switch module; The controlled end of described first switch module is connected with described output switching unit, to receive described first control signal, the input of described first switch module is connected with one end of described first resistance, and the output of described first switch module is connected with one end of described second resistance; The other end of described first resistance is the input of described voltage sampling unit, and the connected node of described second resistance and described first switch module is the output of described voltage sampling unit, the other end ground connection of described second resistance.
Preferably, described first switch module comprises the first NPN type triode, the second PNP type triode, the 3rd resistance; The base stage of described first NPN type triode is the controlled end of described first switch module, the grounded emitter of described first NPN type triode, and the collector electrode of described first NPN type triode is connected with one end of described 3rd resistance; The other end of described 3rd resistance is connected with the base stage of the second PNP type triode, the input of very described first switch module of current collection of described second PNP type triode, the output of very described first switch module of transmitting of described second PNP type triode.
Preferably, described voltage sampling unit also comprises the 4th resistance, the 5th resistance; One end of described 4th resistance is the input of described voltage sampling unit, and the other end of described 4th resistance is connected with one end of described first resistance, and the other end of described first resistance is connected with the emitter of described second PNP type triode; One end of described 5th resistance is connected with the collector electrode of described second PNP type triode, and the connected node of described 5th resistance and the second PNP type triode is the output of described voltage sampling unit, the other end of described 5th resistance is connected with one end of described second resistance, the other end ground connection of described second resistance.
Preferably, described current sampling unit comprises second switch module, described second resistance; The controlled end of described second switch module is connected with described output switching unit, to receive described second control signal; The input of described second switch module is the input of described current sampling unit, the output of described second switch module is connected with one end of described second resistance, and the connected node of described second switch module and described second resistance is the other end ground connection of the output of described current sampling unit, described second resistance.
Preferably, described switch module comprises the first enhancement mode NMOS tube; The grid of described first enhancement mode NMOS tube is the controlled end of described second switch module, the drain electrode of described first enhancement mode NMOS tube is the input of described second switch module, and the source electrode of described first enhancement mode NMOS tube is the output of described second switch module.
Preferably, described output switching unit comprises: the first reverse module, for receiving external control signal and described external control signal being carried out anti-phase process, to form described first control signal; Second reverse module, for carrying out anti-phase process to form described second control signal by described first control signal; Output module, for strengthening the driving force of described second control signal.
Preferably, described electric current and voltage dual output control circuit also comprises adjustment unit; The input of described adjustment unit is connected with described public output, alternately to input described voltage sampling signal and current sampling signal, and is alternately exported by its output after amplifying process to described voltage sampling signal and current sampling signal.
In addition, for achieving the above object, present invention also offers a kind of constant voltage constant current power, described constant voltage constant current power comprises power circuit, transformer, constant voltage outputting circuit, limited-voltage control circuit, constant current output circuit, power management chip and above-mentioned electric current and voltage dual output control circuit;
The output of described power circuit is connected with the first input end of described transformer, and the first output of described transformer is connected with the input of described constant voltage outputting circuit, and the second output of described transformer is connected with the input of described constant current output circuit.
The control end of described constant voltage outputting circuit is connected with described limited-voltage control circuit, the output of described constant voltage outputting circuit is connected with the input of the voltage sampling unit of described electric current and voltage dual output control circuit, and the output of described constant current output circuit is connected with the input of the current sampling unit of described electric current and voltage dual output control circuit;
The output of adjustment unit of described electric current and voltage dual output control circuit and the connection of described power management chip, described power management chip is also connected with the input of described power circuit, the second input of described transformer respectively.
In addition, for achieving the above object, present invention also offers a kind of display unit, described display unit comprises display screen, movement and above-mentioned constant voltage constant current power;
The output of the constant voltage outputting circuit of described constant voltage constant current power is also connected with described movement, for providing operating voltage for described movement, the output of the constant current output circuit of described constant voltage constant current power is also connected with described display screen, for providing operating current for described display screen.
Electric current and voltage dual output control circuit provided by the invention comprises voltage sampling unit, current sampling unit, output switching unit.The input of described voltage sampling unit is for gathering voltage signal, and the input of described current sampling unit is for gathering current signal, and the output of described voltage sampling unit and the output of current sampling unit merge into an output.Described output switching unit produces the first control signal and the second control signal to control described voltage sampling unit and the work of current sampling units alternately simultaneously, realizes the voltage signal of sampling and alternately exporting of current signal.Because in electric current and voltage dual output control circuit provided by the invention, the output of voltage sampling unit and the output of current sampling unit merge into an output, and existing voltage output control circuit and electric current output control circuit work alone, whole system needs two outputs, therefore, relative to prior art, the present invention has the simple feature of circuit structure.
Accompanying drawing explanation
Fig. 1 is the high-level schematic functional block diagram of constant voltage constant current power of the present invention;
Fig. 2 is the high-level schematic functional block diagram of electric current and voltage dual output control circuit of the present invention;
Fig. 3 is the electrical block diagram of output control unit in electric current and voltage dual output control circuit of the present invention;
Fig. 4 is the electrical block diagram of voltage sampling unit and current sampling unit one embodiment in electric current and voltage dual output control circuit of the present invention;
Fig. 5 is the electrical block diagram of voltage sampling unit and another embodiment of current sampling unit in electric current and voltage dual output control circuit of the present invention
Fig. 6 is constant voltage constant current power one embodiment electrical block diagram of the present invention;
Fig. 7 is another embodiment electrical block diagram of constant voltage constant current power of the present invention;
Fig. 8 is the functional block diagram of display unit of the present invention.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 1, the invention provides a kind of constant voltage constant current power, described constant voltage constant current power comprises:
Power circuit 11, transformer 12, constant voltage outputting circuit 13, constant current output circuit 14, electric current and voltage dual output control circuit 15, power management chip 16 and limited-voltage control circuit 17.The output of described power circuit 11 is connected with the first input end of described transformer 12, first output of described transformer 12 is connected with the input of described constant voltage outputting circuit 13, and the second input of described transformer 12 is connected with the input of described constant current output circuit 14.
The control end of described constant voltage outputting circuit 13 is connected with described limited-voltage control circuit 17, the output of described constant voltage outputting circuit 13 is connected with the voltage signal acquisition end of described electric current and voltage dual output control circuit 15, and the output of described constant current output circuit 14 is connected with the current signal collection terminal of described electric current and voltage dual output control circuit 15.The output of described electric current and voltage dual output control circuit 15 is connected with one end of described power management chip 16, and described power management chip is also connected with the input of described power circuit 11, the second input of described transformer 12 respectively.
Described power circuit 11, transformer 12, constant voltage outputting circuit 13, limited-voltage control circuit 17, electric current and voltage dual output control circuit 15 and power management chip 16 form constant voltage source.Described power circuit 11, transformer 12, constant current output circuit 14, electric current and voltage dual output control circuit 15 and power management chip 16 form constant-current supply.
Described electric current and voltage dual output control circuit 15 voltage signal that constant voltage outputting circuit 12 exports according to the magnitude of voltage interleaved acquisition of control signal and the current signal that described constant current output circuit 14 exports, control described constant voltage source and constant-current supply alternation.
Particularly, when described constant voltage constant current power starts, described power circuit 11 exports a voltage and is supplied to described transformer 12, described voltage transition is become two paths of signals by described transformer 12, and the first via in described two paths of signals is delivered to described constant voltage outputting circuit 13, the second road signal in described two paths of signals is delivered to described constant current output circuit 14.
When described electric current and voltage dual output control circuit 15 gathers the voltage signal of described constant voltage outputting circuit 13 output according to the magnitude of voltage of control signal, and when the sampled signal of described voltage signal being delivered to one end of described power management chip 16, described power management chip 16 controls described transformer 12 according to the sampled signal of described voltage signal and exports constant voltage, described constant voltage source conducting, described constant-current supply disconnects, and described constant voltage constant current power exports constant voltage.
When described electric current and voltage dual output control circuit 15 gathers the current signal of described constant current output circuit 14 output according to the magnitude of voltage of control signal, and when the sampled signal of described current signal being delivered to one end of described power management chip 16, described power management chip 16 controls described transformer 12 according to the sampled signal of described current signal and exports constant current, described constant-current supply conducting, described constant voltage outputting circuit 13 exports a magnitude of voltage under the control of described limited-voltage control circuit 17, and described constant voltage constant current power exports constant current.
Described electric current and voltage dual output control circuit 15 voltage signal that constant voltage outputting circuit 12 exports according to the magnitude of voltage interleaved acquisition of described control signal and the current signal that described constant current output circuit 14 exports, realize the function of the constant pressure and flow interleaved power of described constant voltage constant current power.
Constant voltage constant current power provided by the invention comprises constant voltage source and constant-current supply.Wherein, the on off operating mode of described constant voltage source and constant-current supply is controlled by described electric current and voltage dual output control circuit.Because described electric current and voltage dual output control circuit only has an output, no matter be therefore constant voltage source work or constant-current supply work, described power management chip is all that the signal exported according to described electric current and voltage dual output control circuit controls described constant voltage constant current power output constant voltage signal or constant current signal, therefore, constant voltage constant current power can replace output constant voltage signal and constant current signal continuously.
Wherein, as shown in Figure 2, above-mentioned electric current and voltage dual output control circuit 15 comprises voltage sampling unit 151, current sampling unit 152, output switching unit 150.
The input of described voltage sampling unit 151 is for gathering voltage signal Uo, the input of described current sampling unit 152 is for gathering current signal Io, and the output of described voltage sampling unit 151 and the output of current sampling unit 152 merge into public output OUT.
Described output switching unit 150 exports first and controls signal to described voltage sampling unit 151, and output second controls signal to described current sampling unit 152, to control described voltage sampling unit and the work of current sampling units alternately simultaneously.
Particularly, as shown in Figure 3 and Figure 4, described output switching unit 150 comprises the 8th resistance R8, the 9th resistance R9, the 6th resistance R6, the 3rd NPN type triode Q3, the tenth resistance R10, the 7th resistance R7, the 4th NPN type triode Q4, the 5th NPN type triode Q5, the 6th PNP type triode Q6, the 11 resistance R11.
One end of described 8th resistance R8 is for receiving pwm control signal, tell the 8th resistance R8 the other end be connected with one end of described 9th resistance R9, the base stage of the 3rd NPN type triode Q3 respectively, the other end ground connection of described 9th resistance R9, the grounded emitter of described 3rd NPN type triode Q3, described 3rd NPN type triode Q3 is connected with one end of described 6th resistance R6, and the connected node of described 3rd NPN type triode Q3 and described 6th resistance R6 exports the first control signal
the collector electrode of described 3rd NPN type triode Q3 is also connected with one end of described tenth resistance R10, the base stage of described 4th NPN type triode Q4, the other end ground connection of described tenth resistance R10.
The grounded emitter of described 4th NPN type triode Q4, the collector electrode of described 4th NPN type triode Q4 is connected with one end of described 7th resistance R7, another termination power of described 7th resistance R7, the collector electrode of described 4th NPN type triode Q4 also with the base stage of described 5th NPN type triode Q5, the base stage of the 6th PNP type triode Q6 connects, the collector electrode of described 5th NPN type triode Q5 connects power supply, the emitter of described 5th NPN type triode Q5 is connected with the emitter of described 6th PNP type triode Q6, the grounded collector of described 6th PNP type triode Q6, the emitter of described 5th NPN type triode Q5 is also connected with one end of described 11 resistance R11, the other end of described 11 resistance R11 is for exporting described second control signal.
Wherein, the first inversed module of described output switching unit 150 comprises described 6th resistance R6 and described 3rd NPN type triode Q3.Second reverse module of described output switching unit 150 comprises described 7th resistance R7 and described 4th NPN type triode Q4.The output module of described output switching unit 150 comprises described 5th NPN type triode Q5 and described 6th PNP type triode.
When described pwm control signal exports high level, described 3rd NPN type triode Q3 conducting, the magnitude of voltage of described first control signal is the difference that supply voltage and described 6th resistance R6 both end voltage are fallen, due between the emitter of described 3rd NPN type triode Q3 and ground wire and there is no divider resistance between described 3rd NPN type triode Q3 and described 6th resistance R6, therefore the difference that described supply voltage and described 6th resistance R6 both end voltage are fallen is about the turn-on voltage of described 3rd NPN type triode Q3, it is low level that first inversed module of described output switching unit 150 exports described first control signal
described 4th NPN type triode Q4 cut-off, described 5th NPN type triode Q5 conducting, described 6th PNP type triode Q6 cut-off, it is high level PWMA that the second inversed module of described output switching unit 150 exports described second control signal.
In like manner, when described pwm control signal output low level, described 3rd NPN type triode Q3 cut-off, it is high level that the first inversed module of described output switching unit 150 exports described first control signal
described 4th NPN type triode Q4 conducting, described 5th NPN type triode Q5 cut-off, described 6th PNP type triode Q6 conducting, it is low level PWMA that the second inversed module of described output switching unit 150 exports described second control signal.
Described voltage sampling unit 151 comprises the first resistance R1, the second PNP type triode Q2, the 3rd resistance R3, the first NPN type triode Q1, the second resistance R2, the first enhancement mode NMOS tube N1 with current sampling unit 152.
One end of described first resistance R1 is the input of described voltage sampling unit 151, for gathering voltage signal, the other end of described first resistance R1 is connected with the emitter of described second PNP type triode Q2, the base stage of described second PNP type triode Q2 is connected with one end of described 3rd resistance R3, the other end of described 3rd resistance R3 is connected with the collector electrode of described first NPN type triode Q1, the base stage of described first NPN type triode Q1 is for receiving described first control signal, the grounded emitter of described first NPN type triode Q1, the collector electrode of described second PNP type triode Q2 is connected with one end of described second resistance R2 and the source electrode of described first enhancement mode NMOS tube N1 respectively, the connected node of described second PNP type triode Q2 and described second resistance R2 is the output of described voltage sampling unit 151, the other end ground connection of described second resistance R2.The grid of described first enhancement mode NMOS tube N1 is for receiving described second control signal, and the drain electrode of described first enhancement mode NMOS tube N1 is the input of described current sampling unit 152, for gathering current signal.
Wherein, described current sampling unit comprises the second resistance R2 and the first enhancement mode NMOS tube N1.Described voltage sampling unit comprises the first resistance R1, the second PNP type triode Q2, the 3rd resistance R3, the first NPN type triode Q1.
Further, as shown in Figure 5, described voltage sampling unit 151 also comprises the 4th resistance R4 and the 5th resistance R5.
One end of described 4th resistance R4 is the input of described voltage sampling unit 151, for gathering voltage signal, the other end of described 4th resistance R4 is connected with one end of described first resistance R1, and the other end of described first resistance R1 is connected with the emitter of described second PNP type triode Q2.One end of described 5th resistance R5 is connected with the collector electrode of described second PNP type triode Q2, the connected node of described 5th resistance R5 and described second PNP type triode Q2 is the output of described voltage sampling unit 151, the other end of described 5th resistance R5 is connected with one end of described second resistance R2, the other end ground connection of described second resistance R2.
Described first resistance and the second resistance are used for gathering voltage signal for described voltage sampling unit.Increase the magnitude of voltage that the 4th resistance and the 5th resistance can disperse described voltage sampling unit to gather, the voltage sampling signal that described voltage sampling unit is exported is more accurate.
When described pwm control signal exports high level, described first control signal
output low level, described first NPN type triode Q1 cut-off, described second PNP type triode Q2 cut-off, the first switch module of described voltage sampling unit 151 disconnects, and described voltage sampling unit 151 does not work.Described second control signal PWMA exports high level, described first enhancement mode NMOS tube N1 conducting, the second switch module conducting of described current sampling unit 152, the input of current sampling unit 152 described in the second switch module controls of described current sampling unit 152 gathers current signal, described current sampling unit obtains the sampled signal of described current signal by described second resistance R2, and described current sampling unit 152 exports the sampled signal of described current signal.
When described pwm control signal output low level, described first control signal exports high level
described second control signal output low level PWMA, described first enhancement mode NMOS tube N1 ends, and the second switch module of described current sampling unit 152 disconnects, and described current sampling unit 152 does not work.Described first NPN type triode Q1 conducting, described second PNP type triode Q2 conducting, described second control signal controls the first switch module conducting of described voltage sampling unit 151, first switch module of described voltage sampling unit 151 controls the input collection voltage signal of described voltage sampling unit 151, described voltage sampling module obtains the sampled signal of described voltage signal by described 5th resistance R5, the second resistance R2, and described voltage sampling unit 151 exports the sampled signal of described voltage signal.
Described pwm control signal alternately exports low and high level, described output switching unit 150 controls described voltage signal sampling unit 151 and the alternation of described current signal sampling unit 152 according to the magnitude of voltage of described pwm control signal, realizes alternately exporting of voltage sampling signal and current sampling signal.
Voltage sampling unit and the current sampling unit of electric current and voltage dual output control circuit provided by the invention have shared sample resistance.Due in the process of voltage sampling unit and the work of current sampling units alternately described in described output switching unit controls, described shared resistance is working always.Therefore, the sampling voltage signal that described electric current and voltage dual output control circuit exports and sampling current signal are continuous print, alternately do not have the time difference in output procedure.
Further, as shown in Figure 6, Fig. 6 is a kind of concrete structure schematic diagram of constant voltage constant current power provided by the invention.
Described constant voltage constant current power comprises power circuit 11, transformer 12, constant voltage outputting circuit 13, constant current output circuit 14, electric current and voltage dual output control circuit 15, power management chip 16, limited-voltage control circuit 17.
Described power circuit 11 comprises AC power, EMI filter unit, rectification filtering unit, PFC Active PFC unit.Described AC power is connected with the input of described EMI filter unit, the output of described EMI filter unit is connected with the input of described rectification filtering unit, the output of described rectification filtering unit is connected with the output of described PFC Active PFC unit, and the output of described PFC Active PFC unit is the output of described power circuit 11.Described transformer 12 comprise the first former limit winding L 1 with the second former limit winding L 2, iron core, the first vice-side winding L3 and the second vice-side winding L4, described first former limit winding L 1 is connected with the second former limit winding L 2, and described first vice-side winding L3 connects with the second vice-side winding L4.The L11 end of described first former limit winding L 1 is the first input end of described transformer 12, and the L12 of described first former limit winding L 1 holds ground connection.The L21 end of described second former limit winding L 2 is described transformer 12 second input, and the L22 of described second former limit winding L 2 holds ground connection.The two ends of described first vice-side winding L3 are all used as signal output part.The L41 end of described second vice-side winding L4 is the first signal output part of described transformer 12, and the L42 of described second vice-side winding L4 holds ground connection.
Described constant voltage outputting circuit 13 comprises the 5th diode D5, the second electric capacity C2.The positive pole of described 5th diode D5 is connected with the first output L41 of described transformer 12, as the output of described constant voltage outputting circuit 13 after drawing after the negative pole of described 5th diode D5 is connected with one end of described second electric capacity C2, the other end ground connection of described second electric capacity C2.Described second electric capacity C2 is used for the output voltage filtering for described constant voltage outputting circuit 13.
Described constant current output circuit 14 comprises the 3rd electric capacity C3, the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4, the 4th electric capacity C4, the 5th electric capacity D5, the first LED string LED1 ... LED1n and the second LED string LED2 ... LED2n.One end of described 3rd electric capacity C3 is held with the L41 of the second vice-side winding L4 of described transformer 12 and is connected, the other end of described 3rd electric capacity C3 is connected with the positive pole of described first diode D1, the negative pole of the second diode D2 respectively, the plus earth of described second diode D2, the negative pole of described first diode D1 is connected with one end of described 4th electric capacity C4, one end of the first LED string respectively, the other end ground connection of described 4th electric capacity C4, the other end of described first LED string is the output of described constant current output circuit 14.The negative pole of described 3rd diode D3 is held with the L42 of the second vice-side winding L4 of described transformer 12 respectively, the positive pole of described 4th diode D4 is connected, the plus earth of described 3rd diode D3, the negative pole of described 4th diode D4 is connected with one end of described 5th electric capacity C5, one end of described second LED string respectively, the other end ground connection of described 5th electric capacity C5, the other end of described second LED string is the output of described constant current output circuit 14.Described first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4 are used for rectification; Described 4th electric capacity C4, the 5th electric capacity C5 are used for filtering.When the voltage height that the L31 of the first vice-side winding L3 of described transformer 12 holds than the L32 of described first vice-side winding L3, described first LED string work, when the L31 of the first vice-side winding L3 of described transformer 12 holds the voltage held than the L32 of described first vice-side winding L3 low, described second LED string work.
Described electric current and voltage dual output control circuit 15 is above-mentioned electric current and voltage dual output control circuit 15.Further, described electric current and voltage dual output control circuit 15 also comprises the 13 resistance R13, the 7th NPN type triode Q7, operational amplifier U4A, the first electric capacity C1, the 12 resistance R12.The base stage of described 7th NPN type triode Q7 is connected with standby signal PSON, the grounded emitter of described 7th NPN type triode Q7, the collector electrode of described 7th NPN type triode Q7 is connected with one end of described 13 resistance R13, and the other end of described 13 resistance R13 is connected with one end of above-mentioned second resistance R2, one end of the 3rd resistance R3 respectively.Wherein, described operational amplifier U4A, the first electric capacity C1, the 12 resistance R12 form the adjustment unit of described electric current and voltage dual output control circuit 15.Described adjustment unit is used for being input to power management chip 16 by after the voltage signal of above-mentioned sampling or current signal amplification.
The inverting input input reference voltage Verf of described operational amplifier U4A, the in-phase input end of described operational amplifier is connected with above-mentioned public output, the output of described operational amplifier U4A is connected rear extraction with one end of described 12 resistance R12, be configured to the output of described electric current and voltage dual output control circuit 15, the other end of described 12 resistance R12 is connected with one end of described first electric capacity C1, and the other end of described first electric capacity C1 is connected with the in-phase input end of described operational amplifier U4A.
The model of described power management chip 16 is TEA1716.Optocoupler U2, the 18 resistance R18 is also connected with between described power management chip 16 and described electric current and voltage dual output control circuit 15.The secondary signal end U22 of described optocoupler U2 is connected with the output of described electric current and voltage dual output control circuit 15, the first signal end U21 of described optocoupler U2 is connected with one end of described 18 resistance R18, the other end of described 18 resistance R18 is connected with the output of described constant voltage outputting circuit 15, the 3rd signal end U23 ground connection of described optocoupler U2, the 4th signal end U24 of described optocoupler U2 is connected with the 21 leads ends SNSFB of described power management chip 16.
The second depletion type PMOS N2, the 3rd depletion type PMOS N3, the 7th electric capacity C7 is also connected with between described power management chip 16 and power circuit 11 and transformer 12.The grid of described second depletion type PMOS N2 is connected with the tenth leads ends GATELS of described power management chip 16, the source ground of described second depletion type PMOS N2, the drain electrode of described second depletion type PMOS N2 respectively with one end of described 7th electric capacity C7, the source electrode of the 3rd depletion type PMOS N3 connects, the other end of described 7th electric capacity C7 is held with the L11 of the first former limit winding L 1 of described transformer 12 and is connected, the grid of described 3rd depletion type PMOS N3 is connected with the 13 leads ends GATEHS of described power management chip 16, the drain electrode of described 3rd depletion type PMOS N3 is connected with the output of described power circuit 11, 7th leads ends GATEPFC of described power management chip 16 is connected with the input of described power circuit 11, 6th leads ends SUPIC of described power management chip 16 holds with the L21 of the second former limit winding L 2 of described transformer 11 and is connected.
Described limited-voltage control circuit 17 comprises the 6th diode D6, the 4th enhancement mode NMOS tube N4, the 14 resistance R14, the 15 resistance R15, the 16 resistance R16, the 17 resistance R17, the 6th electric capacity C6, controlled rectifier IC3.The negative pole of described 6th diode D6 and the drain electrode of described 4th enhancement mode NMOS tube N4 are connected with the output of described constant voltage outputting circuit 13, the positive pole of described 6th diode D6 and the source electrode of described 4th enhancement mode NMOS tube N4 connect power supply, the grid of described 4th enhancement mode NMOS tube N4 respectively with one end of described 14 resistance R14, one end of 16 resistance R16, the secondary signal end IC32 of controlled rectifier IC3 connects, the 3rd signal end IC33 ground connection of described controlled rectifier IC3, the first signal end IC31 of described controlled rectifier IC3 respectively with one end of described 17 resistance R17, one end of 6th electric capacity C6, one end of 15 resistance R15 connects, the other end ground connection of described 17 resistance R17, the other end of described 6th electric capacity C6 is connected with the other end of described 16 resistance R16, the other end of described 17 resistance R17 and the other end of described 15 resistance R15 connect power supply.Described 15 resistance R15 and the 17 resistance R17 forms bleeder circuit, makes the magnitude of voltage that described constant voltage outputting circuit 13 exports when described constant voltage source disconnects be less than supply voltage.
When standby, pwm control signal and PSON standby signal are low level, and the output switching unit of described electric current and voltage dual output control circuit 15 exports the first control signal
for high level, the second control signal PWMA that described electric current and voltage dual output control circuit 15 exports is low level.Described first enhancement mode NMOS tube N1 ends, described first NPN type triode Q1 conducting, described second PNP type triode Q2 conducting, the voltage sampling cell operation of described dual output control circuit 15.Now, described voltage sampling unit comprises: the 4th resistance R4, the first resistance R1, the 3rd resistance R3, the 5th resistance R5, the second resistance R2, the first NPN type triode Q1 and the second PNP type triode Q2.
The common port of described electric current and voltage dual output control circuit 15 exports voltage signal that described voltage sampling unit the samples adjustment unit to described dual output control circuit 15, exports after the voltage signal of described sampling is carried out amplification process by the adjustment unit of described dual output control circuit 15.The voltage signal of the sampling after amplification controls described power management chip 16 by described optocoupler U2, and described power management chip 16 enters power-saving working mode, makes the constant voltage outputting circuit 13 output voltage step-down of described constant voltage constant current power, as 8V.
Upon power-up, described PSON standby signal is high level.Described 7th NPN type triode Q7 conducting, the voltage sampling unit 151 of described electric current and voltage dual output control circuit 15 comprises: the 4th resistance R4, the first resistance R1, the 3rd resistance R3, the 5th resistance R5, the second resistance R2, the 13 resistance R13, the first NPN type triode Q1, the second PNP type triode Q2 and the 7th NPN type triode Q7.
When described pwm control signal exports high level, the output switching unit of described electric current and voltage dual output control circuit 15 exports described first control signal
for low level, it is high level that the output switching unit of described electric current and voltage dual output control circuit 15 exports the second control signal PWMA.The current sampling cell operation of described electric current and voltage dual output control circuit 15, the common port of described electric current and voltage dual output control circuit 15 exports voltage signal that described current sampling unit the samples adjustment unit to described dual output control circuit 15, exports after the voltage signal of described sampling is carried out amplification process by the adjustment unit of described dual output control circuit 15.The voltage signal of the sampling after amplification controls described power management chip 16 by described optocoupler U2, and the constant current output circuit 14 that described power management chip 16 controls described constant voltage constant current power exports constant current, is described LED statements based on collusion electricity.Now, because voltage after the conducting of described LED string remains constant, therefore, the constant voltage of described transformer 12 exports winding L 4 and also maintains constant voltage.
When described pwm control signal output low level, the output switching unit of described electric current and voltage dual output control circuit 15 exports described first control signal
for high level, it is low level that the output switching unit of described electric current and voltage dual output control circuit 15 exports the second control signal PWMA.The voltage sampling cell operation of described electric current and voltage dual output control circuit 15, the common port of described electric current and voltage dual output control circuit 15 exports voltage signal that described voltage sampling unit the samples adjustment unit to described dual output control circuit 15, exports after the voltage signal of described sampling is carried out amplification process by the adjustment unit of described dual output control circuit 15.The voltage signal of the sampling after amplification controls described power management chip 16 by described optocoupler U2, and the constant voltage outputting circuit 13 that described power management chip 16 controls described constant voltage constant current power exports constant voltage.Now, the second control signal PWMA exported due to described output switching unit is low level, and described first enhancement mode NMOS tube N1 is turned off, and therefore, described LED string extinguishes.
Described pwm control signal alternately exports low and high level, and described constant voltage source 13 and the alternation of described constant-current supply 14, described constant voltage constant current power realizes the function of constant pressure and flow interleaved power.
In addition, as shown in Figure 7, Fig. 7 is the another kind of concrete structure schematic diagram of constant voltage constant current power provided by the invention.
Wherein, the difference of the present embodiment and upper embodiment is, the power circuit 11 in the present embodiment comprises AC power, EMI filter unit, rectification filtering unit; The output of described AC power is connected with the input of described EMI filter unit, the output of described EMI filter unit is connected with the output of described rectification filtering unit, the output of described rectification filtering unit is the output of described power circuit 11, holds be connected with the L11 of the first former limit winding L 1 of above-mentioned transformer 12.
Described power management chip 16 is flyback control chip.The second depletion type PMOS N2 is connected with between described transformer 12 and power management chip 16, the grid of described second depletion type PMOS N2 is connected with described flyback control chip first output, the source ground of described second depletion type PMOS N2, the drain electrode of described second depletion type PMOS N2 is held with the L12 of the first former limit winding L 1 of described transformer 12 and is connected, and the second output of described flyback control chip is held with the L21 of the second former limit winding L 2 of described transformer 12 and is connected.
Because above-mentioned electric current and voltage dual output control circuit does not have the time difference in the current signal process alternately exporting voltage signal and the sampling sampled, and power management chip controls described constant voltage constant current power output constant voltage signal or constant current signal according to the signal that described electric current and voltage dual output control circuit exports in described constant voltage constant current power, therefore, constant voltage constant current power provided by the invention does not have the time difference in the process alternately exporting constant voltage signal and constant current signal.In sum, the invention solves constant voltage constant current power and alternately export the problem not having the time difference in constant voltage signal and constant current signal process.
As shown in Figure 8, present invention also offers a kind of display unit, described display unit comprises display screen, movement and above-mentioned constant voltage constant current power, the output of the constant voltage outputting circuit of described constant voltage constant current power is also connected with described movement, for providing operating voltage for described movement, the output of the constant current output circuit of described constant voltage constant current power is also connected with described display screen, for providing operating current for described display screen.
Particularly, when described display unit is standby, the constant current output circuit of described constant voltage constant current power is not for described display screen provides operating current, and described display screen does not work.The output of the constant voltage outputting circuit of described constant voltage constant current power exports a standby voltage, maintains the standby voltage of described movement.
When described display unit is opened and the constant-current supply of described constant voltage constant current power works, described display screen obtains operating current, described display screen is bright, the output of the constant voltage outputting circuit of described constant voltage constant current power exports a magnitude of voltage under the control of its limited-voltage control circuit, maintains the operating voltage of described movement.
When described display unit is opened and the constant voltage source of described constant voltage constant current power works, described movement obtains operating voltage, and described display screen does not have operating current, and display screen does not work.
Display unit provided by the invention comprises display screen, movement and above-mentioned constant voltage constant current power.Because described constant voltage constant current power does not have the time difference in the process alternately exporting constant voltage signal and constant current signal, therefore, display unit provided by the invention operationally display screen can not be glimmered.
These are only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize specification of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. an electric current and voltage dual output control circuit, is characterized in that, described electric current and voltage dual output control circuit comprises voltage sampling unit, current sampling unit, output switching unit;
The input of described voltage sampling unit is for gathering voltage signal, and the input of described current sampling unit is for gathering current signal, and the output of described voltage sampling unit and the output of current sampling unit merge into public output;
Described output switching unit exports first and controls signal to described voltage sampling unit, and output second controls signal to described current sampling unit, to control described voltage sampling unit and the work of current sampling units alternately simultaneously.
2. electric current and voltage dual output control circuit as claimed in claim 1, it is characterized in that, described voltage sampling unit comprises the first resistance, the second resistance, the first switch module; The controlled end of described first switch module is connected with described output switching unit, to receive described first control signal, the input of described first switch module is connected with one end of described first resistance, and the output of described first switch module is connected with one end of described second resistance; The other end of described first resistance is the input of described voltage sampling unit, and the link node of described second resistance and described first switch module is the output of described voltage sampling unit, the other end ground connection of described second resistance.
3. electric current and voltage dual output control circuit as claimed in claim 2, it is characterized in that, described first switch module comprises the first NPN type triode, the second PNP type triode, the 3rd resistance; The base stage of described first NPN type triode is the controlled end of described first switch module, the grounded emitter of described first NPN type triode, and the collector electrode of described first NPN type triode is connected with one end of described 3rd resistance; The other end of described 3rd resistance is connected with the base stage of the second PNP type triode, the input of very described first switch module of current collection of described second PNP type triode, the output of very described first switch module of transmitting of described second PNP type triode.
4. electric current and voltage dual output control circuit as claimed in claim 3, it is characterized in that, described voltage sampling unit also comprises the 4th resistance, the 5th resistance; One end of described 4th resistance is the input of described voltage sampling unit, and the other end of described 4th resistance is connected with one end of described first resistance, and the other end of described first resistance is connected with the emitter of described second PNP type triode; One end of described 5th resistance is connected with the collector electrode of described second PNP type triode, and the connected node of described 5th resistance and the second PNP type triode is the output of described voltage sampling unit, the other end of described 5th resistance is connected with one end of described second resistance, the other end ground connection of described second resistance.
5. electric current and voltage dual output control circuit as claimed in claim 2, it is characterized in that, described current sampling unit comprises second switch module, described second resistance; The controlled end of described second switch module is connected with described output switching unit, to receive described second control signal; The input of described second switch module is the input of described current sampling unit, the output of described second switch module is connected with one end of described second resistance, and the connected node of described second switch module and described second resistance is the other end ground connection of the output of described current sampling unit, described second resistance.
6. electric current and voltage dual output control circuit as claimed in claim 5, it is characterized in that, described second switch module comprises the first enhancement mode NMOS tube; The grid of described first enhancement mode NMOS tube is the controlled end of described second switch module, the drain electrode of described first enhancement mode NMOS tube is the input of described second switch module, and the source electrode of described first enhancement mode NMOS tube is the output of described second switch module.
7. electric current and voltage dual output control circuit as claimed in claim 1, it is characterized in that, described output switching unit comprises:
First inversed module, for receiving external control signal and described external control signal being carried out anti-phase process, to form described first control signal;
Second inversed module, for carrying out anti-phase process to form described second control signal by described first control signal;
Output module, for strengthening the driving force of described second control signal.
8. electric current and voltage dual output control circuit as claimed in claim 1, it is characterized in that, described electric current and voltage dual output control circuit also comprises adjustment unit; The input of described adjustment unit is connected with described public output, alternately to input described voltage sampling signal and current sampling signal, and is alternately exported by its output after amplifying process to described voltage sampling signal and current sampling signal.
9. a constant voltage constant current power, it is characterized in that, described constant voltage constant current power comprises power circuit, transformer, constant voltage outputting circuit, limited-voltage control circuit, constant current output circuit, power management chip and the electric current and voltage dual output control circuit as described in any one of claim 1-8;
The output of described power circuit is connected with the first input end of described transformer, and the first output of described transformer is connected with the input of described constant voltage outputting circuit, and the second output of described transformer is connected with the input of described constant current output circuit;
The control end of described constant voltage outputting circuit is connected with described limited-voltage control circuit, the output of described constant voltage outputting circuit is connected with the input of the voltage sampling unit of described electric current and voltage dual output control circuit, and the output of described constant current output circuit is connected with the input of the current sampling unit of described electric current and voltage dual output control circuit;
The output of adjustment unit of described electric current and voltage dual output control circuit and the connection of described power management chip, described power management chip is also connected with the input of described power circuit, the second input of described transformer respectively.
10. a display unit, is characterized in that, described display unit comprises display screen, movement and constant voltage constant current power according to claim 9; The output of the constant voltage outputting circuit of described constant voltage constant current power is also connected with described movement, for providing operating voltage for described movement; The output of the constant current output circuit of described constant voltage constant current power is also connected with described display screen, for providing operating current for described display screen.
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