CN207732622U - Output voltage constant-voltage control circuit - Google Patents

Output voltage constant-voltage control circuit Download PDF

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Publication number
CN207732622U
CN207732622U CN201721848553.8U CN201721848553U CN207732622U CN 207732622 U CN207732622 U CN 207732622U CN 201721848553 U CN201721848553 U CN 201721848553U CN 207732622 U CN207732622 U CN 207732622U
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CN
China
Prior art keywords
switch unit
electrically connected
stable pressure
resistance
controllable accurate
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.)
Expired - Fee Related
Application number
CN201721848553.8U
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Chinese (zh)
Inventor
丁正武
涂冬生
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DONGGUAN QIYI ELECTRONIC MACHINERY Co Ltd
Original Assignee
DONGGUAN QIYI ELECTRONIC MACHINERY Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by DONGGUAN QIYI ELECTRONIC MACHINERY Co Ltd filed Critical DONGGUAN QIYI ELECTRONIC MACHINERY Co Ltd
Priority to CN201721848553.8U priority Critical patent/CN207732622U/en
Application granted granted Critical
Publication of CN207732622U publication Critical patent/CN207732622U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model discloses a kind of output voltage constant-voltage control circuits, it includes voltage regulation unit, first switch unit and second switch unit, the first switch unit input terminal is electrically connected external power supply, the output end of the first switch unit and the output end of voltage regulation unit are electrically connected, the control terminal of the first switch unit is electrically connected second switch unit, the control terminal of the second switch unit is electrically connected voltage regulation unit, and the voltage regulation unit includes controllable accurate source of stable pressure.The utility model is by being arranged controllable accurate source of stable pressure, the cathode of controllable accurate source of stable pressure is coordinated to be electrically connected the control terminal of second switch unit, second switch unit is electrically connected the control terminal of first switch unit, the outputs level signals of the cathode to control controllable accurate source of stable pressure are fed back in the output introduced by the reference pole of controllable accurate source of stable pressure, and then control the break-make of second switch unit and first switch unit, it is simple in structure, it is of low cost, output voltage pressure-keeping functions can be realized well.

Description

Output voltage constant-voltage control circuit
Technical field
The utility model is related to consumer electronics fields, more particularly, to a kind of output voltage constant-voltage control circuit.
Background technology
Traditional output voltage pressure-keeping functions are generally used MCU controllers to be controlled, and the cost of MCU controllers compared with Height is very not cost-effective from cost performance, how to maximize the production cost for saving switching circuit, becomes urgent need to resolve Technical problem.
Utility model content
Based on this, it is necessary to for above-mentioned background technology there are the problem of, a kind of output voltage constant-voltage control circuit is provided, It is simple in structure, it is of low cost, output voltage pressure-keeping functions can be realized well.
To achieve the above object, the utility model discloses a kind of output voltage constant-voltage control circuits comprising voltage stabilizing list Member, first switch unit and second switch unit, the first switch unit input terminal electric connection external power supply, described first The output end of the output end of switch unit and voltage regulation unit is electrically connected, and the control terminal of the first switch unit is electrically connected the The control terminal of two switch units, the second switch unit is electrically connected voltage regulation unit;
The voltage regulation unit includes controllable accurate source of stable pressure, first resistor, second resistance and the first capacitance, first electricity Resistance one end corresponds to the output end of voltage regulation unit, and the first resistor other end is electrically connected with second resistance one end, and described second The anode of the resistance other end and controllable accurate source of stable pressure is electrically connected, the plus earth of the controllable accurate source of stable pressure, it is described can The reference pole of control precision voltage regulator is electrically connected between first resistor and second resistance, the cathode of the controllable accurate source of stable pressure It is electrically connected the control terminal of second switch unit, first capacitance both ends are electrically connected in the ginseng of controllable accurate source of stable pressure Examine the anode of pole and controllable accurate source of stable pressure.
The second switch unit includes the first triode, 3rd resistor and the 4th resistance in one of the embodiments, The base stage of first triode corresponds to the control terminal of second switch unit, and the base stage of first triode passes through 3rd resistor Be electrically connected with the cathode of controllable accurate source of stable pressure, the 4th resistance both ends be electrically connected the first triode base stage and The emitter of first triode, the emitter ground connection of first triode, the collector of first triode are electrically connected The control terminal of first switch unit.
The first switch unit includes the first metal-oxide-semiconductor, the 5th resistance and the 6th resistance in one of the embodiments, The grid of first metal-oxide-semiconductor is electrically connected by the collector of the 5th resistance and the first triode, the source of first metal-oxide-semiconductor Pole is electrically connected external power supply, and the source electrode of the first metal-oxide-semiconductor and the grid of the first metal-oxide-semiconductor are electrically connected in the 6th resistance both ends Pole, the output end of the corresponding first switch unit of drain electrode of first metal-oxide-semiconductor.
The source electrode of first metal-oxide-semiconductor and the grid of the first metal-oxide-semiconductor are electrically connected surely in one of the embodiments, Press diode.
In conclusion the utility model output voltage constant-voltage control circuit is by being arranged controllable accurate source of stable pressure, cooperation can The cathode for controlling precision voltage regulator is electrically connected the control terminal of second switch unit, and second switch unit is electrically connected first switch list The control terminal of member, the output introduced by the reference pole of controllable accurate source of stable pressure feed back to control the cathode of controllable accurate source of stable pressure Outputs level signals, and then control the break-make of second switch unit and first switch unit, ensure that the constant pressure of output voltage Output effect, it is simple in structure, it is of low cost, output voltage pressure-keeping functions can be realized well.
Description of the drawings
Fig. 1 is the schematic block circuit diagram of the utility model output voltage constant-voltage control circuit;
Fig. 2 is the circuit diagram of the utility model output voltage constant-voltage control circuit.
Specific implementation mode
As depicted in figs. 1 and 2, the utility model output voltage constant-voltage control circuit includes voltage regulation unit 100, first switch Unit 200 and second switch unit 300,200 input terminal of first switch unit are electrically connected external power supply 400, and described the The output end of one switch unit 200 is electrically connected with the output end of voltage regulation unit 100, for controlling output voltage Vout;It is described The control terminal of first switch unit 200 is electrically connected second switch unit 300, the control terminal electricity of the second switch unit 300 Property connection voltage regulation unit 100.
Specifically, the voltage regulation unit 100 includes controllable accurate source of stable pressure IC1, first resistor R1, second resistance R2 and the One one end capacitance C1, the first resistor R1 corresponds to the output end of voltage regulation unit 100, the first resistor R1 other ends and second The one end resistance R2 is electrically connected, and the anode of the second resistance R2 other ends and controllable accurate source of stable pressure IC1 is electrically connected, described The reference pole of the plus earth of controllable accurate source of stable pressure IC1, the controllable accurate source of stable pressure IC1 is electrically connected at first resistor R1 Between second resistance R2, the cathode of the controllable accurate source of stable pressure IC1 is electrically connected the control terminal of second switch unit 300, The both ends first capacitance C1 are electrically connected in the reference pole of controllable accurate source of stable pressure IC1 and controllable accurate source of stable pressure IC1 Anode.
The second switch unit 300 include the first triode Q1,3rd resistor R3 and the 4th resistance R4, the described 1st The base stage of pole pipe Q1 corresponds to the control terminal of second switch unit 300, and the base stage of the first triode Q1 passes through 3rd resistor R3 It is electrically connected with the cathode of controllable accurate source of stable pressure IC1, the first triode Q1 is electrically connected in the both ends the 4th resistance R4 Base stage and the first triode Q1 emitter, the first triode Q1 emitter ground connection, the first triode Q1's Collector is electrically connected the control terminal of first switch unit 200.
The first switch unit 200 includes the first metal-oxide-semiconductor Q2, the 5th resistance R5 and the 6th resistance R6, the first MOS The grid of pipe Q2 is electrically connected by the collector of the 5th resistance R5 and the first triode Q1, the source electrode of the first metal-oxide-semiconductor Q2 It is electrically connected external power supply 400, the source electrode and the first MOS of the first metal-oxide-semiconductor Q2 is electrically connected in the both ends the 6th resistance R6 The grid of pipe Q2, the drain electrode of the first metal-oxide-semiconductor Q2 correspond to the output end of first switch unit 200.
The source electrode of the first metal-oxide-semiconductor Q2 and the grid of the first metal-oxide-semiconductor Q2 electrically connect respectively in one of the embodiments, Zener diode ZD1 is met, the zener diode ZD1 is used to carry out pressure limiting to the driving voltage of the first metal-oxide-semiconductor Q2, to avoid outer The excessive damage caused to the first metal-oxide-semiconductor Q2 of the voltage of portion's power supply 400.
When the utility model specific works, the reference pole of controllable accurate source of stable pressure IC1 introduces output feedback, and controllable accurate is steady Potential source IC1 can by from cathode to anode wide range of shunting control output voltage Vout, output voltage Vout=(1+ R1/R2) Vr, Vr are the reference pole tension value of controllable accurate source of stable pressure IC1, when first resistor R1 and the resistance value of second resistance R2 are true Periodically, output voltage Vout increases, and feedback voltage V r also increases, and the cathode of controllable accurate source of stable pressure IC1 exports low level signal, The base stage input low level signal of first triode Q1, the first triode Q1 cut-offs, then the grid input of the first metal-oxide-semiconductor Q2 is low Level signal, the first metal-oxide-semiconductor Q2 cut-offs, external power supply 400 can not be by the first metal-oxide-semiconductor Q2 output voltages, at this point, output voltage Vout=0V;Output voltage Vout is reduced, and feedback voltage V r is also reduced, the cathode of controllable accurate source of stable pressure IC1 exports high level Signal, the base stage input high level signal of the first triode Q1, the first triode Q1 are connected, then the grid of the first metal-oxide-semiconductor Q2 Input high level signal, the first metal-oxide-semiconductor Q2 conductings, external power supply 400 is by the first metal-oxide-semiconductor Q2 output voltages, and output is electric at this time It is the output voltage of external power supply 400 to press Vout, and output voltage Vout increases, and so recycles, ensure that output voltage Vout's Constant pressure output effect, it is simple in structure, it is of low cost, output voltage pressure-keeping functions can be realized well.
In conclusion the utility model output voltage constant-voltage control circuit is by being arranged controllable accurate source of stable pressure IC1, cooperation The cathode of controllable accurate source of stable pressure IC1 is electrically connected the control terminal of second switch unit 300, and second switch unit 300 electrically connects The control terminal for connecing first switch unit 200, the output feedback introduced by the reference pole of controllable accurate source of stable pressure IC1 can to control The outputs level signals of the cathode of precision voltage regulator IC1 are controlled, and then control second switch unit 300 and first switch unit 200 Break-make, ensure that the constant pressure output effect of output voltage, it is simple in structure, it is of low cost, can realize well output voltage perseverance Press function.
Above-described embodiments merely represent several embodiments of the utility model, the description thereof is more specific and detailed, But it should not be understood as limiting the scope of the patent of the utility model.It should be pointed out that for the common of this field For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to In the scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.

Claims (4)

1. a kind of output voltage constant-voltage control circuit, it is characterised in that:Including voltage regulation unit, first switch unit and second switch Unit, the first switch unit input terminal are electrically connected external power supply, output end and the voltage stabilizing list of the first switch unit The output end of member is electrically connected, and the control terminal of the first switch unit is electrically connected second switch unit, the second switch The control terminal of unit is electrically connected voltage regulation unit;
The voltage regulation unit includes controllable accurate source of stable pressure, first resistor, second resistance and the first capacitance, the first resistor one The output end of the corresponding voltage regulation unit in end, the first resistor other end are electrically connected with second resistance one end, the second resistance The anode of the other end and controllable accurate source of stable pressure is electrically connected, the plus earth of the controllable accurate source of stable pressure, the controllable essence The reference pole of close source of stable pressure is electrically connected between first resistor and second resistance, and the cathode of the controllable accurate source of stable pressure is electrical The control terminal of second switch unit is connected, first capacitance both ends are electrically connected in the reference pole of controllable accurate source of stable pressure With the anode of controllable accurate source of stable pressure.
2. output voltage constant-voltage control circuit according to claim 1, it is characterised in that:The second switch unit includes The base stage of first triode, 3rd resistor and the 4th resistance, first triode corresponds to the control terminal of second switch unit, institute The base stage for stating the first triode is electrically connected by the cathode of 3rd resistor and controllable accurate source of stable pressure, the 4th resistance both ends The base stage of the first triode and the emitter of the first triode is electrically connected, the emitter of first triode is grounded, The collector of first triode is electrically connected the control terminal of first switch unit.
3. output voltage constant-voltage control circuit according to claim 2, it is characterised in that:The first switch unit includes First metal-oxide-semiconductor, the 5th resistance and the 6th resistance, the collection that the grid of first metal-oxide-semiconductor passes through the 5th resistance and the first triode Electrode is electrically connected, and the source electrode of first metal-oxide-semiconductor is electrically connected external power supply, and the 6th resistance both ends are electrically connected The grid of the source electrode of first metal-oxide-semiconductor and the first metal-oxide-semiconductor, the output end of the corresponding first switch unit of drain electrode of first metal-oxide-semiconductor.
4. output voltage constant-voltage control circuit according to claim 3, it is characterised in that:The source electrode of first metal-oxide-semiconductor And first the grid of metal-oxide-semiconductor zener diode is electrically connected.
CN201721848553.8U 2017-12-26 2017-12-26 Output voltage constant-voltage control circuit Expired - Fee Related CN207732622U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201721848553.8U CN207732622U (en) 2017-12-26 2017-12-26 Output voltage constant-voltage control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201721848553.8U CN207732622U (en) 2017-12-26 2017-12-26 Output voltage constant-voltage control circuit

Publications (1)

Publication Number Publication Date
CN207732622U true CN207732622U (en) 2018-08-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201721848553.8U Expired - Fee Related CN207732622U (en) 2017-12-26 2017-12-26 Output voltage constant-voltage control circuit

Country Status (1)

Country Link
CN (1) CN207732622U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110071635A (en) * 2018-01-24 2019-07-30 中科院微电子研究所昆山分所 A kind of power on-off control circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110071635A (en) * 2018-01-24 2019-07-30 中科院微电子研究所昆山分所 A kind of power on-off control circuit

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Granted publication date: 20180814