CN204117010U - Switching mode mu balanced circuit, constant pressure and flow produce circuit and constant voltage constant current power equipment - Google Patents
Switching mode mu balanced circuit, constant pressure and flow produce circuit and constant voltage constant current power equipment Download PDFInfo
- Publication number
- CN204117010U CN204117010U CN201420400870.3U CN201420400870U CN204117010U CN 204117010 U CN204117010 U CN 204117010U CN 201420400870 U CN201420400870 U CN 201420400870U CN 204117010 U CN204117010 U CN 204117010U
- Authority
- CN
- China
- Prior art keywords
- voltage
- circuit
- constant
- resistor
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The utility model discloses a kind of switching mode mu balanced circuit, constant pressure and flow produces circuit and constant voltage constant current power equipment, this mu balanced circuit comprises DC constant voltage input end and output terminal, be coupling in the voltage stabilizing chip between constant voltage input end and output terminal, this mu balanced circuit comprises further: given voltage input end; Voltage follower circuit, one of its input end is connected with given voltage input end, and its output terminal is coupled with the feedback end of described voltage stabilizing chip; And by first resistor be connected in series of the output head grounding of described mu balanced circuit and the second resistor, this first resistor is connected with the output terminal of described voltage follower circuit with the tie point of the second resistor.The utility model can regulation voltage or electric current separately, and each passage is independent of each other, and the precision of voltage and current is higher, and range of adjustment is larger; The utility model can realize any switching laws of electric current and voltage on arbitrary passage; Adjustable the while of the utility model constant voltage and constant current, under constant current state, itself and backlight are all in optimum Working, generate heat minimum, most effective.
Description
Technical field
The utility model relates to a kind of mu balanced circuit, and particularly a kind of switching mode mu balanced circuit, constant pressure and flow produce circuit and constant voltage constant current power equipment.
Background technology
Liquid crystal module manufacturer needs to do a lighting to each product and detects, and checks whether liquid crystal panel has impurity, bright spot, dim spot or bad point, thus assesses the quality of this liquid crystal panel.But the brightness of liquid crystal panel itself is very little, so be that people examines or automation equipment inspection all needs a light source to reach enough brightness, thousands of even brightness of ten thousand grades reaches testing requirement.
The automation equipment that the larger module factory commercial city of current Some Domestic is is to detect the quality of liquid crystal panel; comprise bright spot, dim spot or dust, foreign matter etc.; for detector lens (high definition camera); different LCD product is different to brightness requirement, otherwise usually there will be the false judgment such as undetected, flase drop, false retrieval.So just directly affects the quality of product.There is the equipment that light source voltage, electric current are much provided in prior art, but all limitation is existed for the requirement of the adjustment of electric current, voltage and electric current, voltage.And regulate light-source brightness cumbersome in module manufacturer when switching different product at every turn, even to change software program or change power supply, causing cost to increase further.
There are following problems in prior art:
1, existing voltage, current and power supply cannot meet continuously uninterrupted steady operation and accuracy requirement;
2, backlight electric power generally all adopts linear voltage stabilization chip to realize the adjustment of voltage swing, and thermal value is large, and efficiency is low.Power consumption is large, fragile;
3, part backlight electric power output voltage, current settings scope little or only several grades adjustable, and cannot realize linearly regulating on a large scale, the requirement of most of backlight cannot be adapted to, and when changing backlight, power supply also need to change.
4, one in voltage driven or current driver mode being only provided, when not changing wiring, cannot any switching laws being realized.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of switching mode mu balanced circuit, to solve problems of the prior art.
For solving the problems of the technologies described above, the utility model adopts following technical proposals:
A kind of switching mode mu balanced circuit, this mu balanced circuit comprises
DC constant voltage input end and output terminal,
Be coupling in the voltage stabilizing chip between constant voltage input end and output terminal,
It is characterized in that, this mu balanced circuit comprises further:
Given voltage input end;
Voltage follower circuit, one of its input end is connected with given voltage input end, and its output terminal is coupled with the feedback end of described voltage stabilizing chip; And
By first resistor be connected in series of the output head grounding of described mu balanced circuit and the second resistor, this first resistor is connected with the output terminal of described voltage follower circuit with the tie point of the second resistor.
Preferably, this mu balanced circuit comprises further:
Described voltage follower circuit comprises the first operational amplifier, the first triode and the 3rd resistor, wherein an input end of the first operational amplifier is connected with given voltage input end, the collector of the first triode is coupled with the feedback end of described voltage stabilizing chip, and the emitter of the first triode is by the 3rd resistance-grounded system; And
First resistor is connected with the collector of described triode with the tie point of the second resistor.
A kind of constant pressure and flow produces circuit, comprises above-mentioned switching mode mu balanced circuit, and this constant pressure and flow produces the further constant pressure and flow commutation circuit of circuit, and described constant pressure and flow commutation circuit comprises:
Given current input terminal;
Second operational amplifier, the second triode and MOS transistor, and
First, second, third and fourth switch,
Wherein, one of input end of the second operational amplifier is connected with given current input terminal, second and the four switch ground connection of its another input end by being connected in series, and its output terminal is coupled with the base stage of described second triode by described 3rd switch,
The collector of the second triode is connected with the grid of described MOS transistor, and this tie point is coupled with the voltage output end of described switching mode mu balanced circuit and passes through the first switch ground connection, the grounded emitter of the second triode,
The source electrode of MOS transistor is connected with circuit output end of pressure-stabilizing.
Preferably, this constant pressure and flow commutation circuit comprises further:
Be connected to the 6th resistor between the source electrode of described MOS transistor and described circuit output end of pressure-stabilizing;
The 5th resistor be connected in series with described first switch;
Be connected to the load end between MOS transistor drain electrode and earth polar; With
Be connected to the 8th resistor between load end and earth polar.
A kind of constant voltage constant current power equipment, comprising:
DC constant voltage source;
Arm processor;
Voltage given unit, respectively according to the setting voltage value output multi-channel voltage from arm processor;
Given value of current unit, respectively according to the setting current value output multi-channel electric current from arm processor;
Switching mode mu balanced circuit;
Constant pressure and flow commutation circuit, and
Multiple electric current and voltage output port, is characterized in that
Switching mode mu balanced circuit comprises voltage follower circuit, and the input end of mu balanced circuit is connected with described DC constant voltage source, and the quantity of the given voltage input end of voltage follower circuit is identical with the quantity of described voltage given unit output terminal, and coupling connects,
Constant pressure and flow commutation circuit comprises constant-current circuit and multiple switch, the given current input terminal of this constant-current circuit is connected with described given value of current unit, the voltage input end of this constant-current circuit is connected with the output terminal of described mu balanced circuit, and described multiple switch makes the electric current and voltage output port that connect corresponding to this constant pressure and flow commutation circuit export constant voltage or steady current according to the control signal break-make from arm processor.
Preferably, each switching mode mu balanced circuit also comprises first resistor be connected in series of the output head grounding of described mu balanced circuit and the second resistor, described voltage follower circuit comprises the first operational amplifier, the first triode and the 3rd resistor, wherein an input end of the first operational amplifier is connected with voltage given unit, the collector of the first triode is coupled with the feedback end of described voltage stabilizing chip, and the emitter of the first triode is by the 3rd resistance-grounded system; And
First resistor is connected with the collector of described triode with the tie point of the second resistor.
Preferably, this constant pressure and flow commutation circuit comprises further:
Second operational amplifier, the second triode and MOS transistor, and
First, second, third and fourth switch,
Wherein, one of input end of the second operational amplifier is connected with given value of current unit, second and the four switch ground connection of its another input end by being connected in series, and its output terminal is coupled with the base stage of described second triode by described 3rd switch,
The collector of the second triode is connected with the drain electrode of described MOS transistor, and this tie point is coupled with the voltage output end of described switching mode mu balanced circuit and passes through the first switch ground connection, the grounded emitter of the second triode,
The source electrode of MOS transistor is connected with circuit output end of pressure-stabilizing.
Preferably, this constant pressure and flow commutation circuit comprises further:
Be connected to the 4th resistor between the grid of described MOS transistor and described circuit output end of pressure-stabilizing; With
The 5th resistor be connected in series with described first switch.
Preferably, this power-supply device comprises the multiple current detection circuit detecting described multiple load end electric current and the multiple voltage detecting circuits detecting described multiple load terminal voltage further.
Preferably, this power-supply device comprises serial communication interface further, for being communicated with host computer by described arm processor.
The beneficial effects of the utility model are as follows:
The utility model is compared with prior art:
1, the utility model can regulation voltage or electric current separately, and each passage is independent of each other;
2, the utility model voltage, current precision are higher, Current adjustment precision ± 2mA, voltage regulation accuracy ± 0.1V;
3, the utility model electric current, voltage regulation limits are comparatively large, range of current (0mA-2000mA); Voltage range (10.0V-33.0V) can adapt to most of backlight to voltage, the requirement of electric current;
4, the utility model electric current, voltage stability are good, set electric current or voltage parameter, in power-off or to restart start parameter value be last settings;
5, the utility model can realize any switching laws of electric current and voltage on arbitrary passage.Mutual switching from voltage mode to power mode, without the need to changing wiring;
6, the utility model adopts switching mode voltage stabilizing chip to realize voltage continuously adjustabe, and thermal value is little, and efficiency is high, and it is very little that the power supply of same power can do;
Adjustable the while of 7 the utility model constant voltages and constant current, under constant current state, voltage can adjust to the state that just can meet circuit and normally work, and this sample device itself and backlight are all in optimum Working.Generate heat minimum, most effective.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail;
Fig. 1 illustrates the schematic diagram of switching mode mu balanced circuit described in the utility model;
Fig. 2 illustrates the schematic diagram of constant pressure and flow commutation circuit described in the utility model;
Fig. 3 illustrates that constant pressure and flow described in the utility model produces the schematic diagram of circuit;
Fig. 4 illustrates the schematic diagram of a kind of high-power constant voltage constant current source able to programme described in the utility model.
Embodiment
As shown in Figure 1, the utility model discloses a kind of switching mode mu balanced circuit, this circuit comprises the voltage stabilizing chip U2 be coupling between voltage input end and output terminal; Inductance L 1 is connected with between voltage stabilizing chip U2 and voltage output end; The output terminal of mu balanced circuit U2 is by the first resistor R1 of being connected in series and the second resistor R2 ground connection; This mu balanced circuit also comprises given voltage input end Vi and voltage follower circuit, one of input end of voltage follower circuit is connected with given voltage input end Vi, its output terminal is coupled with the feedback end of voltage stabilizing chip U2, and the output terminal of voltage follower circuit is connected with the tie point of the first resistor R1 and the second resistor R2 simultaneously.This voltage follower circuit comprises the first operational amplifier U1A, the first triode Q1 and the 3rd resistor R3, the positive input terminal of the first operational amplifier U1A is connected with assigned voltage input end Vi, the output terminal of the first operational amplifier U1A is connected with the base stage of the first triode Q1, the negative input end of the first operational amplifier U1A is connected with the emitter of the first triode Q1, the collector of the first triode Q1 is connected with the feedback end of voltage stabilizing chip U2, and the emitter of the first triode Q1 is by the 3rd resistor R3 ground connection.This switching mode voltage of voltage regulation also comprises and is connected to voltage stabilizing chip U2 and the first diode D1 between inductance L 1 tie point and earth polar.
As shown in Figure 2, in the present embodiment, constant pressure and flow commutation circuit is by MOS transistor Q2, 4th resistor R4, 5th resistor R5, 6th resistor R6, 7th resistor R7, 8th resistor R8, second triode Q2 and the second amplifier U1B and first, second, 3rd, 4th analog switch and backlight LED, these elements form constant pressure and flow commutation circuit by electrically connecting, and by four analog switches this circuit can be switched to and be operated in constant current state or on off state, the constant voltage exported by switching mode mu balanced circuit, by the given voltage end VBL1 of constant pressure and flow commutation circuit, and powered to backlight LED by MOS transistor Q2, it is made to be operated in pressure constant state.
As shown in Figure 3, a kind of constant pressure and flow produces circuit, this circuit comprises above-mentioned switching mode mu balanced circuit, this circuit also comprises constant pressure and flow commutation circuit, this constant pressure and flow commutation circuit comprises given current input terminal, the second operational amplifier U1B, the second triode Q3 and MOS transistor Q2, and first, second, third and fourth analog switch; The positive input terminal of the second operational amplifier U1B is connected with given current input terminal, and its negative input end is by wearing second and the 4th analog switch ground connection of connection, and its output terminal is coupled with the base stage of the second triode Q2 by the 3rd analog switch; The collector of the second triode Q2 is connected with the grid of MOS transistor Q2, and is coupled with the output terminal of switching mode mu balanced circuit, is connected, the grounded emitter of the second triode Q3 by the first analog switch with earth polar simultaneously; The source electrode of MOS transistor is connected with circuit output end of pressure-stabilizing.This constant pressure and flow produces circuit and also comprises the 6th resistor R6 be connected between the source electrode of MOS transistor Q2 and circuit output end of pressure-stabilizing; The 5th resistor R5 be connected in series with the first analog switch; Be connected to the 4th resistor R4 between the base stage of the 3rd triode Q3 and the 3rd analog switch; The 5th resistor be connected in series with described first switch; Be connected to the load end between MOS transistor drain electrode and earth polar; And the 8th resistor R8 be connected between load end and earth polar.
As shown in Figure 4, the utility model further discloses a kind of high-power constant voltage constant current source able to programme, this power-supply device comprises DC constant voltage source, arm processor, voltage given circuit, given value of current circuit, switching mode mu balanced circuit, constant pressure and flow commutation circuit, and multiple electric current and voltage output port.This power-supply device also comprises the multiple current detection circuit and detection multiple voltage detecting circuit of described multiple load terminal voltage and the serial communication interface for being communicated with host computer by described arm processor that detect described multiple load end electric current.Only for 4 passages, one described in the utility model high-power constant voltage constant current source able to programme is described in embodiment, but the utility model is not limited only to four-way use, can support hyperchannel.This power-supply device is made up of arm processor 1, voltage given circuit 2, given value of current circuit 3, current detection circuit 4, voltage detecting circuit 5, switching mode mu balanced circuit 6, constant pressure and flow commutation circuit 7, hardware voltage protection circuit 8, on-off circuit 9, voltage/current output port 10, serial communication circuit 11,36V power interface 13.For 4 passages in the present embodiment, wherein, after arm processor 1 accepts external command, export corresponding voltage, current value, by the method real-time transform operating voltage and electric current through analytical Calculation by voltage given circuit 2 and given value of current circuit 3.Current detection circuit 4 and voltage detecting circuit 5 are responsible for the output voltage detecting this equipment 4 passages, the instantaneous value of electric current, and compare with desired value, realize the defencive function of overvoltage or overcurrent.Each road of switching mode mu balanced circuit 6 is all connected on 36V power interface 13, obtains 36V DC voltage, by the feedback end of voltage given circuit 2 gauge tap type mu balanced circuit 6, realizes the adjustment of voltage.By the adjustment of given value of current circuit realiration size of current.The voltage exported or electric current output on voltage/current output port 10 through on-off circuit 9.Wherein on-off circuit 9 can realize opening and closing function of output voltage or electric current.Realize Flash Mode.Close no time simultaneously, also can be energy-conservation, reduce the thermal value of power supply.The switching that constant pressure and flow commutation circuit 7 exports for controlling constant pressure and flow.Realize fast shut-off 36V DC voltage during the 36V direct supply overvoltage that hardware voltage protection circuit 8 supplies in outside, protection internal circuit is not damaged.
The utility model carries out the principle of work of voltage-regulation by constant voltage circuit: arm processor accepts external control instruction, mode of operation is switched to voltage mode, and write in ROM, the mode of operation of last setting is remained during start next time, then the outside given voltage swing needing to regulate, its adjustable extent is that 10.0-33.0V is adjustable, stepping-in amount 0.1V, arm processor calculates suitable numerical value after resolving and is input in voltage given module, voltage given module, by the size of current in regulating constant volt circuit, realizes the adjustment of voltage swing.The voltage-regulation of continuously linear can be realized like this, and then realize back light source brightness adjustment.For pulse width modulation (PWM) can only be adopted to regulate the backlight realizing brightness regulation, because its principle is exactly realize brightness regulation with the voltage duty cycle of closing, so equally also need to be set to voltage operation mode by regulating backlight to open.Constant voltage circuit as shown in Figure 1:
It is as follows that voltage exports relation between Uo and voltage sets Vi:
I0＝(Uo-1.25)/R1 (1)
I1＝1.25/R2 (2)
I2＝Vi/R3 (3)
I0＝I1+I2 (4)
Obtained by (1) (2) (3) (4) formula simultaneous solution:
Vi＝Uo(R3/R1)-1.25*R3(1/R1+1/R2) (5)
In formula (5), R1, R2, R3, be known so formula (5) can be reduced to further:
If A=R3/R1.B=1.25*R3 (1/R1+1/R2).
Then Vi=A*Uo-B (6)
Uo: need the voltage swing exported is given by host computer.
Vi: the size of given voltage, is determined by Uo size.
By drawing above: utilize the thinking that switching mode voltage stabilizing chip feedback end voltage constant is constant, by voltage stabilizing chip U2, diode D1, first inductance L 1, first resistance R1 and the second resistance R2 is by being electrically connected the nonadjustable constant voltage source of composition voltage, in the access of voltage stabilizing chip feedback end by the first operational amplifier U1A, first triode Q1 and the 3rd resistance R3 is by being electrically connected an adjustable constant flow source circuit of the voltage follower circuit design formed, the electric current I 2 flowing through voltage stabilizing chip U2 feedback end is regulated to carry out the size of gauge tap type voltage stabilizing chip U2 output voltage by constant-current source circuit.As long as external unit sets the size of output voltage, Vi just can export the voltage of corresponding size to change electric current I 2 size, is similar to and changes resistance R2//R3 resistance size to change the size of output voltage.Reach the object of linear regulation output voltage size.If the digital to analog converter precision in voltage given circuit is enough high, then what stepping-in amount can be done is less than 0.1V or less, improves voltage output precision further.With adopt compared with digital regulation resistance scheme in prior art, there is following lot of advantages: voltage continuously adjustabe.Precision depends on the precision of A/D; Hardware circuit is simple, reliably.
Constant pressure and flow commutation circuit principle of work described in the utility model: the operating voltage set, and under being switched to current working mode condition, and the voltage of setting is generally than backlight voltage height about 1V, steering order is sent to arm processor by external unit, the given size of current needing to regulate, its range of adjustment is 0-2000mA, stepping-in amount 2mA, arm processor calculates suitable numerical value after resolving and is input in given value of current circuit, given value of current circuit, by regulating the size of the resistive voltage of crossfire in load, realizes the adjustment of size of current.The Current adjustment of continuously linear can be realized like this, and then realize back light source brightness adjustment.As shown in Figure 2, the handoff procedure of voltage, current working mode is as follows:
As seen from Figure 2, when the 3rd analog switch and the 4th analog switch close, when first analog switch and the second analog switch are opened, the constant-current source circuit be made up of the second operational amplifier U1B, the 3rd analog switch, the 4th analog switch, the 4th resistor R4, the 7th resistor R7, the 6th resistor R6, the 8th resistor R8, the first triode Q1, metal-oxide-semiconductor Q2, backlight LED, as long as this resistance is from current settings end, certain voltage is set, just can obtains invariable electric current in LED backlight loop.Reach the object of constant current.When the 3rd analog switch and the 4th analog switch are opened, when first analog switch and the second analog switch close, be made up of MOS transistor Q2, the 5th resistor R5, the 5th resistor R6, the 8th resistor R8, the first analog switch, the second analog switch, backlight LED.This circuit is just operated in saturation conduction state, and MOS transistor Q2 is equivalent to switch, and given magnitude of voltage VBL1 to be powered to backlight LED by MOS transistor Q2 and extreme by the second analog switch access ground.Now LED backlight works in constant voltage mode; Stepping-in amount with 0.1V between 10.0-33.0V magnitude of voltage can be adjusted arbitrarily by voltage given circuit.When being operated in constant voltage mode, given magnitude of voltage VBL1 is just added in load LED backlight by Q2, in addition because the second analog switch is also in closure state, although the conducting of the second analog switch, but resistance only has a few milliohm, be equivalent to the 8th resistor R8 and be shorted, so the 8th resistor R8 does not almost consume, reduce power supply power consumption, reduce thermal value.8th resistor R8 only works under constant current state.
In sum, can regulation voltage or electric current separately by scheme described in the utility model, each passage is independent of each other; The utility model precision is higher, Current adjustment precision ± 2mA, voltage regulation accuracy ± 0.1V; The utility model electric current, voltage regulation limits are comparatively large, electric current setting range between 0mA-2000mA, due to this equipment voltage, electric current is simultaneously adjustable, so can control the power consumption of this equipment, makes it be in optimum Working, thus realize large-scale voltage, Current adjustment.Prior art cannot realize electric current and voltage and regulate simultaneously, and power consumption is large, if regulated on a large scale, can cause chip overheating and damage; Voltage adjusting range can adapt to most of backlight to voltage between 10.0V-33.0V, the requirement of electric current; The utility model electric current, voltage stability are good, set electric current or voltage parameter, in power-off or to restart start parameter value be last settings; The utility model can realize any switching laws of electric current and voltage on arbitrary passage.Mutual switching from voltage mode to power mode, without the need to changing wiring; The utility model adopts switching mode voltage stabilizing chip to realize voltage continuously adjustabe, and thermal value is little, and efficiency is high, and it is very little that the power supply of same power can do; Adjustable the while of the utility model constant voltage and constant current, under constant current state, voltage can adjust to the state that just can meet circuit and normally work, and this sample device itself and backlight are all in optimum Working.Generate heat minimum, most effective.
Obviously; above-described embodiment of the present utility model is only for the utility model example is clearly described; and be not the restriction to embodiment of the present utility model; for those of ordinary skill in the field; can also make other changes in different forms on the basis of the above description; here cannot give exhaustive to all embodiments, every belong to the technical solution of the utility model the apparent change of extending out or variation be still in the row of protection domain of the present utility model.
Claims (10)
1. a switching mode mu balanced circuit, is characterized in that, this mu balanced circuit comprises
DC constant voltage input end and output terminal,
Be coupling in the voltage stabilizing chip between constant voltage input end and output terminal,
It is characterized in that, this mu balanced circuit comprises further:
Given voltage input end;
Voltage follower circuit, one of its input end is connected with given voltage input end, and its output terminal is coupled with the feedback end of described voltage stabilizing chip; And
By first resistor be connected in series of the output head grounding of described mu balanced circuit and the second resistor, this first resistor is connected with the output terminal of described voltage follower circuit with the tie point of the second resistor.
2. switching mode mu balanced circuit as claimed in claim 1, it is characterized in that, this mu balanced circuit comprises further:
Described voltage follower circuit comprises the first operational amplifier, the first triode and the 3rd resistor, wherein an input end of the first operational amplifier is connected with given voltage input end, the collector of the first triode is coupled with the feedback end of described voltage stabilizing chip, and the emitter of the first triode is by the 3rd resistance-grounded system; And
First resistor is connected with the collector of described triode with the tie point of the second resistor.
3. constant pressure and flow produces a circuit, comprises switching mode mu balanced circuit as claimed in claim 1, it is characterized in that, this constant pressure and flow produces the further constant pressure and flow commutation circuit of circuit, and described constant pressure and flow commutation circuit comprises:
Given current input terminal;
Second operational amplifier, the second triode and MOS transistor, and
First, second, third and fourth switch,
Wherein, one of input end of the second operational amplifier is connected with given current input terminal, second and the four switch ground connection of its another input end by being connected in series, and its output terminal is coupled with the base stage of described second triode by described 3rd switch,
The collector of the second triode is connected with the grid of described MOS transistor, and this tie point is coupled with the voltage output end of described switching mode mu balanced circuit and passes through the first switch ground connection, the grounded emitter of the second triode,
The source electrode of MOS transistor is connected with circuit output end of pressure-stabilizing.
4. constant pressure and flow as claimed in claim 3 produces circuit, and it is characterized in that, this constant pressure and flow commutation circuit comprises further:
Be connected to the 6th resistor between the source electrode of described MOS transistor and described circuit output end of pressure-stabilizing;
The 5th resistor be connected in series with described first switch;
Be connected to the load end between MOS transistor drain electrode and earth polar; With
Be connected to the 8th resistor between load end and earth polar.
5. a constant voltage constant current power equipment, is characterized in that, comprising:
DC constant voltage source;
Arm processor;
Voltage given unit, respectively according to the setting voltage value output multi-channel voltage from arm processor;
Given value of current unit, respectively according to the setting current value output multi-channel electric current from arm processor;
Switching mode mu balanced circuit;
Constant pressure and flow commutation circuit, and
Multiple electric current and voltage output port, is characterized in that
Switching mode mu balanced circuit comprises voltage follower circuit, and the input end of mu balanced circuit is connected with described DC constant voltage source, and the quantity of the given voltage input end of voltage follower circuit is identical with the quantity of described voltage given unit output terminal, and coupling connects,
Constant pressure and flow commutation circuit comprises constant-current circuit and multiple switch, the given current input terminal of this constant-current circuit is connected with described given value of current unit, the voltage input end of this constant-current circuit is connected with the output terminal of described mu balanced circuit, and described multiple switch makes the electric current and voltage output port that connect corresponding to this constant pressure and flow commutation circuit export constant voltage or steady current according to the control signal break-make from arm processor.
6. constant voltage constant current power equipment as claimed in claim 5, it is characterized in that, each switching mode mu balanced circuit also comprises first resistor be connected in series of the output head grounding of described mu balanced circuit and the second resistor, described voltage follower circuit comprises the first operational amplifier, the first triode and the 3rd resistor, wherein an input end of the first operational amplifier is connected with voltage given unit, the collector of the first triode is coupled with the feedback end of described voltage stabilizing chip, and the emitter of the first triode is by the 3rd resistance-grounded system; And
First resistor is connected with the collector of described triode with the tie point of the second resistor.
7. constant voltage constant current power equipment as claimed in claim 6, it is characterized in that, this constant pressure and flow commutation circuit comprises further:
Second operational amplifier, the second triode and MOS transistor, and
First, second, third and fourth switch,
Wherein, one of input end of the second operational amplifier is connected with given value of current unit, second and the four switch ground connection of its another input end by being connected in series, and its output terminal is coupled with the base stage of described second triode by described 3rd switch,
The collector of the second triode is connected with the drain electrode of described MOS transistor, and this tie point is coupled with the voltage output end of described switching mode mu balanced circuit and passes through the first switch ground connection, the grounded emitter of the second triode,
The source electrode of MOS transistor is connected with circuit output end of pressure-stabilizing.
8. constant voltage constant current power equipment as claimed in claim 7, it is characterized in that, this constant pressure and flow commutation circuit comprises further:
Be connected to the 4th resistor between the grid of described MOS transistor and described circuit output end of pressure-stabilizing; With
The 5th resistor be connected in series with described first switch.
9. constant voltage constant current power equipment as claimed in claim 5, is characterized in that, this power-supply device comprises the multiple current detection circuit detecting described multiple load end electric current and the multiple voltage detecting circuits detecting described multiple load terminal voltage further.
10. constant voltage constant current power equipment as claimed in claim 5, it is characterized in that, this power-supply device comprises serial communication interface further, for being communicated with host computer by described arm processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420400870.3U CN204117010U (en) | 2014-07-18 | 2014-07-18 | Switching mode mu balanced circuit, constant pressure and flow produce circuit and constant voltage constant current power equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420400870.3U CN204117010U (en) | 2014-07-18 | 2014-07-18 | Switching mode mu balanced circuit, constant pressure and flow produce circuit and constant voltage constant current power equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204117010U true CN204117010U (en) | 2015-01-21 |
Family
ID=52334301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420400870.3U Withdrawn - After Issue CN204117010U (en) | 2014-07-18 | 2014-07-18 | Switching mode mu balanced circuit, constant pressure and flow produce circuit and constant voltage constant current power equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204117010U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122924A (en) * | 2014-07-18 | 2014-10-29 | 苏州华兴源创电子科技有限公司 | Switch-type voltage stabilizing circuit and constant voltage constant current generation circuit with switch-type voltage stabilizing circuit |
| CN105635389A (en) * | 2016-03-14 | 2016-06-01 | 苏州华兴源创电子科技有限公司 | IC (Integrated Circuit) detecting circuit for driving touch screen of mobile phone |
| CN107885268A (en) * | 2016-09-29 | 2018-04-06 | 联芯科技有限公司 | Negative feedback current source circuit and electronic equipment |
| CN114582299A (en) * | 2022-03-24 | 2022-06-03 | Tcl华星光电技术有限公司 | Polar plate voltage regulating circuit and method |
-
2014
- 2014-07-18 CN CN201420400870.3U patent/CN204117010U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122924A (en) * | 2014-07-18 | 2014-10-29 | 苏州华兴源创电子科技有限公司 | Switch-type voltage stabilizing circuit and constant voltage constant current generation circuit with switch-type voltage stabilizing circuit |
| CN104122924B (en) * | 2014-07-18 | 2016-08-24 | 苏州华兴源创电子科技有限公司 | A kind of switching mode mu balanced circuit and the constant pressure and flow comprising this circuit produce circuit |
| CN105635389A (en) * | 2016-03-14 | 2016-06-01 | 苏州华兴源创电子科技有限公司 | IC (Integrated Circuit) detecting circuit for driving touch screen of mobile phone |
| CN105635389B (en) * | 2016-03-14 | 2019-05-17 | 苏州华兴源创科技股份有限公司 | A kind of IC detection circuit for the driving of Mobile phone touch control screen |
| CN107885268A (en) * | 2016-09-29 | 2018-04-06 | 联芯科技有限公司 | Negative feedback current source circuit and electronic equipment |
| CN114582299A (en) * | 2022-03-24 | 2022-06-03 | Tcl华星光电技术有限公司 | Polar plate voltage regulating circuit and method |
| CN114582299B (en) * | 2022-03-24 | 2023-02-07 | Tcl华星光电技术有限公司 | Polar plate voltage regulating circuit and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104122924B (en) | A kind of switching mode mu balanced circuit and the constant pressure and flow comprising this circuit produce circuit | |
| CN203675387U (en) | LED drive circuit for providing TRIAC holding current by using controllable current source | |
| CN205105426U (en) | Automatic linear constant current LED drive circuit of full voltage sectional type of switching mode | |
| CN101707826B (en) | LED constant current driving circuit | |
| CN105282929A (en) | Full voltage segmented linear constant current LED drive circuit capable of switching modes automatically | |
| CN103249195B (en) | A kind of overvoltage crowbar and panel drive circuit thereof | |
| CN204117010U (en) | Switching mode mu balanced circuit, constant pressure and flow produce circuit and constant voltage constant current power equipment | |
| CN102752898B (en) | Load drive circuit | |
| CN103531156B (en) | Backlight drive circuit and liquid crystal indicator | |
| CN103384436B (en) | LED backlight constant current circuit | |
| CN205490115U (en) | Switching power supply circuit | |
| CN206195635U (en) | Controller and adopt switching power supply of this controller | |
| CN107682961A (en) | A kind of LED fishing lamps power supply output switching circuit | |
| CN203645858U (en) | Step-down control chip, step-down LED drive circuit and display screen | |
| CN202856317U (en) | LED light bar short circuit protection control circuit | |
| CN205210746U (en) | Constant current control ware and constant current control circuit | |
| CN206559040U (en) | A kind of electric equipment and its power supply output overvoltage regulating circuit | |
| CN104244517B (en) | The LED drive system of brightness-adjustable module and brightness-adjustable | |
| CN103841697A (en) | IC chip and control circuit of LED directly driven by electronic ballast | |
| CN102789251B (en) | Current adjustable constant current circuit | |
| CN108012380B (en) | Linear wide-voltage constant-current constant-power circuit and LED lamp with same | |
| CN208621708U (en) | A kind of alternating current power-off signal transmission circuit | |
| CN203761634U (en) | LED TRIAC light-adjusting matcher | |
| CN103857099A (en) | LED light modulation circuit | |
| CN105764180A (en) | Dynamic load adaptive PWM driver |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150121 Effective date of abandoning: 20160824 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |