CN202495738U - Undervoltage protection circuit - Google Patents
Undervoltage protection circuit Download PDFInfo
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- CN202495738U CN202495738U CN201220050104XU CN201220050104U CN202495738U CN 202495738 U CN202495738 U CN 202495738U CN 201220050104X U CN201220050104X U CN 201220050104XU CN 201220050104 U CN201220050104 U CN 201220050104U CN 202495738 U CN202495738 U CN 202495738U
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Abstract
The utility model discloses an undervoltage protection circuit. The undervoltage protection circuit comprises a first comparison unit, a second comparison unit, a first reference voltage generation unit, a second reference voltage generation unit, a control unit, an isolation unit, and a feedback clamp unit. The first comparison unit and the second comparison unit are both provided with a non-inverting input end, an inverting input end and an output end respectively, the inverting input end of the first comparison unit is used to receive a source voltage, the non-inverting input end of first comparison unit is connected with the first reference voltage generation unit, the output end of the first comparison unit is connected with the control unit, the inverting input end of the second comparison unit is connected with the second reference voltage generation unit, the non-inverting input end of the second comparison unit is used to receive the source voltage through the isolation unit, the output end of the second comparison unit is connected with the non-inverting input end of the second comparison unit through the feedback clamp unit, the output end of the second comparison unit is connected with the control unit, and the control unit is used to control the turn-on or turn-off of circuits between a power supply and loads according to output results of the first comparison unit and the second comparison unit. According to the undervoltage protection circuit of the utility model, undervoltage protection is realized.
Description
Technical field
The utility model belongs to the protective circuit field, is specifically related to a kind of under-voltage protecting circuit.
Background technology
Under-voltage protecting circuit is mainly used in direct current system and AC system, promptly when the brownout (promptly under-voltage) of power supply (this power supply can abbreviate power supply as), protects power supply through the circuit that control is cut off between power supply and the load.For example, when power supply exists when under-voltage, generally comprise the power supply power up (from the zero point-under-voltage protection point-rated voltage point) and power supply power supply process (this power supply process; Power supply usually can be according to the rated voltage operate as normal; But also brownout can appear, promptly under-voltage situation sometimes), therefore; In order to guarantee the normal power supply of power supply; Under-voltage protecting circuit only needs at the power supply power supply process, and promptly under-voltage situation works and gets final product, and need not work in the power up of power supply.
Prior art; Play the under-voltage protection effect for fear of under-voltage protecting circuit in the power up of power supply, a kind of method is to carry out under-voltage protection through software control method, though this method has solved above technical problem; But exist guard time long, protect defectives such as untimely; Another kind method is to adopt existing under-voltage protecting circuit; But this circuit needs to quit work in the power supply power up; And start working at the power supply power supply process, though this method also can solve above technical problem, need when the power supply power up, stop under-voltage protecting circuit work; And when the power supply power supply process is started working, start under-voltage protecting circuit, thereby make that the operational sequence of under-voltage protection is complicated.
The utility model content
The utility model provides a kind of new under-voltage protecting circuit for solving the above-mentioned technical problem that existing under-voltage protecting circuit exists.
The technical scheme of the utility model is:
A kind of under-voltage protecting circuit; Comprise first comparing unit, second comparing unit, the first reference voltage generation unit, the second reference voltage generation unit, control unit, isolated location and feedback clamp bit location; Said first comparing unit, second comparing unit all have normal phase input end, inverting input and output; The inverting input of said first comparing unit is used to receive supply voltage; The normal phase input end of first comparing unit links to each other with the first reference voltage generation unit; The output of first comparing unit links to each other with control unit, and the inverting input of second comparing unit links to each other with the second reference voltage generation unit, and the normal phase input end of second comparing unit receives supply voltage through isolated location; The output of second comparing unit connects the positive input of second comparing unit through the feedback clamp bit location; The output of second comparing unit also links to each other with control unit, and wherein, control unit is controlled circuit turn-on or disconnection between power supply and the load according to the output result of first comparing unit and second comparing unit.
Further, said under-voltage protecting circuit also comprises the switch element that is connected between power supply and the load, the controlled unit controls of the break-make of this switch element.
Further, said switch element is metal-oxide-semiconductor, triode or photoelectrical coupler.
Further, said isolated location is first resistance.
Further; Said feedback clamp bit location comprises second resistance, the 3rd resistance and first diode; Wherein the output of second comparing unit links to each other with the anode of first diode, and the negative electrode of first diode links to each other with first end of second resistance, and second end of second resistance links to each other with first end of the 3rd resistance; The second end ground connection of the 3rd resistance, the positive input of said second comparing unit are connected in any point between first end of second end and the 3rd resistance of second resistance.
Further; The said first reference voltage generation unit comprises first power supply, the 4th resistance and the 5th resistance; The normal phase input end of said first comparing unit respectively with an end of the 4th resistance; One end of the 5th resistance links to each other, and the other end of said the 4th resistance links to each other with first power supply, the other end ground connection of said the 5th resistance.
Further; The said second reference voltage generation unit comprises second source, the 6th resistance and the 7th resistance; The inverting input of said second comparing unit respectively with an end of the 6th resistance; One end of the 7th resistance links to each other, and the other end of said the 6th resistance links to each other with second source, the other end ground connection of said the 7th resistance.Further, said under-voltage protecting circuit also comprises electric capacity, and an end of said electric capacity links to each other with the normal phase input end of second comparing unit, the other end ground connection of electric capacity.
Further; Said under-voltage protecting circuit also comprises second diode and the 3rd diode; The anode of said second diode links to each other with the output of first comparing unit; The negative electrode of said second diode links to each other with control unit, and the anode of said the 3rd diode links to each other with the output of second comparing unit, and the negative electrode of said the 3rd diode links to each other with control unit.
Further; The said first reference voltage generation unit is that the voltage that first comparing unit provides is the voltage that second comparing unit provides less than the second reference voltage generation unit, and the second reference voltage generation unit is that the voltage that provides of second comparing unit is less than the required rated voltage of load.
The advantage of the utility model: a kind of under-voltage protecting circuit that the utility model provides; Through comprising first comparing unit, second comparing unit, the first reference voltage generation unit, the second reference voltage generation unit, control unit, isolated location and feedback clamp bit location; Said first comparing unit, second comparing unit all have normal phase input end, inverting input and output; The inverting input of said first comparing unit is used to receive supply voltage; The normal phase input end of first comparing unit links to each other with the first reference voltage generation unit, and the output of first comparing unit links to each other with control unit, and the inverting input of second comparing unit links to each other with the second reference voltage generation unit; The normal phase input end of second comparing unit receives supply voltage through isolated location; The output of second comparing unit connects the positive input of second comparing unit through the feedback clamp bit location, and the output of second comparing unit also links to each other with control unit, wherein; Control unit is controlled circuit turn-on or disconnection between power supply and the load according to the output result of first comparing unit and second comparing unit; Make this under-voltage protecting circuit can either be implemented in power supply power supply process (in this power supply process, power supply is because the undervoltage condition that brownout occurs) and play the under-voltage protection effect, and the power up of power supply (from the zero point-under-voltage protection point-rated voltage point) inoperative; Thereby guarantee that power supply normally powers on; And the under-voltage protecting circuit of the utility model does not need operation bidirectional in whole power supply power up and power supply power supply process, just can accomplish under-voltage protection function automatically.
Description of drawings
The circuit block diagram that Fig. 1 provides for the utility model under-voltage protecting circuit.
The concrete circuit diagram that uses of a preferred embodiment that Fig. 2 provides for the utility model under-voltage protecting circuit.
Embodiment
Clearer for technical problem, technical scheme and beneficial effect that the utility model is solved, below in conjunction with accompanying drawing and embodiment, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
As shown in Figure 1; A kind of under-voltage protecting circuit; Comprise first comparing unit 1, second comparing unit 2, the first reference voltage generation unit 3, the second reference voltage generation unit 4, control unit 5, isolated location 9 and feedback clamp bit location 10; Said first comparing unit 1, second comparing unit 2 all have normal phase input end, inverting input and output; The inverting input of said first comparing unit 1 is used to receive supply voltage, and the normal phase input end of first comparing unit 1 links to each other with the first reference voltage generation unit 3, and the output of first comparing unit 1 links to each other with control unit 5; The inverting input of second comparing unit 2 links to each other with the second reference voltage generation unit 4; The normal phase input end of second comparing unit 2 receives supply voltage through isolated location 9, and the output of second comparing unit 2 is through the positive input of feedback clamp bit location 10 connections second comparing unit 2, and the output of second comparing unit 2 also links to each other with control unit 5; Wherein, control unit 5 is controlled circuit turn-on or disconnection between power supply and the load according to the output result of first comparing unit 1 and second comparing unit 2.
In the practical implementation, please consult Fig. 2 in the lump, can connect through switch element 6 between said power supply 7 and the load 8, controlled unit 5 controls of the break-make of this switch element 6.Said switch element 6 can adopt metal-oxide-semiconductor, triode or photoelectrical coupler etc.
In the practical implementation; Said first comparing unit 1 and second comparing unit 2 can be operational amplifier; Certainly; First comparing unit 1 and second comparing unit 2 of the utility model are not limited to operational amplifier, and it can also not do concrete introduction at this for other arbitrary circuit that has relatively an effect, chip etc. in the prior art.In addition, said control unit 5 can be single-chip microcomputer or photoelectrical coupler, and certainly, it can also be other arbitrary circuit with control action, chip etc. in the prior art, does not do one by one at this and describes.
In the practical implementation, please consult Fig. 2 in the lump, said isolated location 9 can be first resistance R 1, and certainly, this isolated location 9 also can be the device that other has buffer action arbitrarily, does not do concrete introduction at this.In addition; Said feedback clamp bit location 10 comprises second resistance R 2, the 3rd resistance R 3 and the first diode D1, and wherein the output of second comparing unit 2 links to each other with the anode of the first diode D1, and the negative electrode of the first diode D1 links to each other with first end of second resistance R 2; Second end of second resistance R 2 links to each other with first end of the 3rd resistance R 3; The second end ground connection GND of the 3rd resistance R 3, the positive input of said second comparing unit 2 are connected in any point between first end of second end and the 3rd resistance R 3 of second resistance R 2, in like manner; Above-mentioned feedback clamp bit location 10 also can be made up of any chip or circuit, is not described in detail at this.
In the practical implementation; The said first reference voltage generation unit 3, the second reference voltage generation unit 4 is respectively applied for to first comparing unit 1 and second comparing unit 2 that reference voltage is provided; It is understandable that it can be provided by divider resistance, also can directly provide by reference voltage source; Certainly can also provide by other arbitrary circuit that reference voltage is provided of prior art, chip etc., not describe one by one at this.For example; As shown in Figure 2; The said first reference voltage generation unit 3 can comprise the first power supply VCC1, the 4th resistance R 4 and the 5th resistance R 5, the normal phase input end of said first comparing unit 1 respectively with an end of the 4th resistance R 4, an end of the 5th resistance R 5 links to each other; The other end of said the 4th resistance R 4 links to each other with the first power supply VCC1, the other end ground connection GND of said the 5th resistance R 5.In like manner; The said second reference voltage generation unit 4 can comprise second source VCC2, the 6th resistance R 6 and the 7th resistance R 7; The inverting input of said second comparing unit 2 respectively with an end of the 6th resistance R 6; One end of the 7th resistance R 7 links to each other, and the other end of said the 6th resistance R 6 links to each other with second source VCC2, the other end ground connection GND of said the 7th resistance R 7.
What this need explain be; The said first reference voltage generation unit 3 is that the voltage that first comparing unit 1 provides is the voltage that second comparing unit 2 provides less than the second reference voltage generation unit 4, and the second reference voltage generation unit 4 is that the voltage that provides of second comparing unit 2 is less than the required rated voltage of load.
Preferably, please consult Fig. 2 in the lump, said under-voltage protecting circuit also comprises capacitor C, and an end of said capacitor C links to each other with the normal phase input end of second comparing unit 2, the other end ground connection GND of capacitor C, and purpose is that the supply voltage of importing is strobed.
Preferably; Please consult Fig. 2 in the lump, said under-voltage protecting circuit also comprises the second diode D2 and the 3rd diode D3, and the anode of the said second diode D2 links to each other with the output of first comparing unit 1; The negative electrode of the said second diode D2 links to each other with control unit 5; The anode of said the 3rd diode D3 links to each other with the output of second comparing unit 2, and the negative electrode of said the 3rd diode D3 links to each other with control unit 5, and purpose is; Preventing that voltage is counter irritates, and receives the operational amplifier output voltage influence of other circuit when promptly avoiding under-voltage protection.
The concrete circuit diagram that uses of a preferred embodiment that Fig. 2 provides for the utility model under-voltage protecting circuit.Consult Fig. 2; Under-voltage protecting circuit comprises the first operational amplifier U1, the second operational amplifier U2, the first reference voltage generation unit 3, the second reference voltage generation unit 4, control unit 5, capacitor C, the first power supply VCC1, second source VCC2, first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the first diode D1, the second diode D2, the 3rd diode D3 and switch element 6; The said first operational amplifier U1, the second operational amplifier U2 all have normal phase input end, inverting input and output; The inverting input of the said first operational amplifier U1 is used to receive supply voltage; The said first power supply VCC1 is through the 4th resistance R 4, the 5th resistance R 5 ground connection GND; The normal phase input end of the first operational amplifier U1 is connected in any point between the 4th resistance R 4 and the 5th resistance R 5; The output of the first operational amplifier U1 links to each other with the anode of the second diode D2; The negative electrode of the said second diode D2 links to each other with control unit 5; Said second source VCC2 is through the 6th resistance R 6, the 7th resistance R 7 ground connection GND, and the inverting input of the second operational amplifier U2 is connected in any point between the 6th resistance R 6 and the 7th resistance R 7, and the normal phase input end of the second operational amplifier U2 links to each other with an end of first resistance R 1, an end of the 3rd resistance R 3 respectively; The other end of first resistance R 1 is used to receive supply voltage; The other end ground connection GND of the 3rd resistance R 3, the output of the second operational amplifier U2 links to each other with the anode of the first diode D1, and the negative electrode of the first diode D1 links to each other with the normal phase input end of the second operational amplifier U2 through second resistance R 2; The output of the second operational amplifier U2 also links to each other with the anode of the 3rd diode D3; The negative electrode of said the 3rd diode D3 links to each other with control unit 5, and an end of said capacitor C links to each other with the normal phase input end of the second operational amplifier U2, the other end ground connection GND of capacitor C.Wherein, Switch element 6 is connected between power supply 7 and the load 8; Control unit 5 is according to the output of the first operational amplifier U1 and the second operational amplifier U2 break-make of control switch unit 6 as a result, thus circuit turn-on or disconnection between control power supply 7 and the load 8, promptly when the brownout (promptly under-voltage) of supply voltage; Through control cut off the electricity supply 7 and load 8 between circuit protect power supply 7, reach the purpose of under-voltage protection.
Below narrate the operation principle of this embodiment:
According to the change procedure of supply voltage, it is four working stages that the under-voltage protecting circuit of this embodiment is divided into, the undervoltage condition that no-voltage → under-voltage protection point → once under-voltage test point → rated voltage → power supply power supply process occurs.Wherein, The voltage that under-voltage protection point is set equals the voltage (i.e. the voltage at the 5th resistance R 5 two ends) that the first reference voltage generation unit 3 provides; The voltage of under-voltage test point is set once equals the voltage (i.e. the voltage at the 7th resistance R 7 two ends) that the second reference voltage generation unit 4 provides; And the voltage that the voltage that the first reference voltage generation unit 3 provides provides less than the second reference voltage generation unit 4, the voltage that the second reference voltage generation unit 4 provides is less than the required rated voltage of load 8.
Phase I; No-voltage → under-voltage protection point: because the 12 pin voltages of the first operational amplifier U1 (i.e. the supply voltage of input) are less than 13 pin voltages (i.e. the voltage at the 5th resistance R 5 two ends); Then 11 pin of the first operational amplifier U1 are exported high level; Simultaneously since the 15 pin voltages (i.e. the voltage at the 3rd resistance R 3 two ends) of the second operational amplifier U2 less than 16 pin voltages (i.e. the voltage at the 7th resistance R 7 two ends); The 17 pin output low levels of the second operational amplifier U2 then, this moment, the circuit turn-on between power supply 7 and the load 8 was promptly controlled in 6 conductings of control unit 5 control switch unit.
Second stage; Under-voltage protection point → once under-voltage test point: because the 12 pin voltages of the first operational amplifier U1 (i.e. the supply voltage of input) are greater than 13 pin voltages (i.e. the voltage at the 5th resistance R 5 two ends); The 11 pin output low levels of the first operational amplifier U1 then; Simultaneously since the 15 pin voltages (i.e. the voltage at the 3rd resistance R 3 two ends) of the second operational amplifier U2 less than 16 pin voltages (i.e. the voltage at the 7th resistance R 7 two ends); The 17 pin output low levels of the second operational amplifier U2 then, this moment, the circuit turn-on between power supply 7 and the load 8 was promptly controlled in 6 conductings of control unit 5 control switch unit.
Phase III; Once under-voltage test point → rated voltage: because the 12 pin voltages of the first operational amplifier U1 (i.e. the supply voltage of input) are greater than 13 pin voltages (i.e. the voltage at the 5th resistance R 5 two ends); The 11 pin output low levels of the first operational amplifier U1 then; Simultaneously since the 15 pin voltages (i.e. the voltage at the 3rd resistance R 3 two ends) of the second operational amplifier U2 greater than 16 pin voltages (i.e. the voltage at the 7th resistance R 7 two ends), 17 pin of the second operational amplifier U2 are exported high level, and; The high level of the 17 pin output of this second operational amplifier U2 is realized auto-lock function through the first diode D1, second resistance R 2 and the 3rd resistance R 3; Promptly make 17 pin of the second operational amplifier U2 continue the output high level, this moment, the circuit turn-on between power supply 7 and the load 8 was promptly controlled in 6 conductings of control unit 5 control switch unit.
Stage; (in this power supply process, power supply usually can be according to the rated voltage operate as normal, but also brownout can occur sometimes for the undervoltage condition that the power supply power supply process occurs; Be under-voltage situation): because 12 pin voltages of first operational amplifier (i.e. the supply voltage of input) are less than 13 pin voltages (i.e. the voltage at the 5th resistance R 5 two ends); Then 11 pin of the first operational amplifier U1 are exported high level, simultaneously, because auto-lock function; Make the 15 pin voltages (i.e. the voltage at the 3rd resistance R 3 two ends) of the second operational amplifier U2 greater than 16 pin voltages (i.e. the voltage at the 7th resistance R 7 two ends); Then 17 pin of the second operational amplifier U2 continue the output high level, and this moment, control unit 5 control switch unit 6 were ended, and the circuit of promptly controlling between power supply 7 and the load 8 breaks off.
Draw by above working stage analysis; The under-voltage protecting circuit of this embodiment has reached following purpose; Promptly play the under-voltage protection effect at power supply power supply process (in this power supply process, power supply is because the undervoltage condition that brownout occurs), and the power up of power supply (from the zero point-under-voltage protection point-rated voltage point) inoperative; Thereby guarantee that power supply normally powers on; And the under-voltage protecting circuit of the utility model does not need operation bidirectional in whole power supply power up and power supply power supply process, just can accomplish under-voltage protection function automatically.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection range of the utility model.
Claims (10)
1. under-voltage protecting circuit; It is characterized in that; Comprise first comparing unit, second comparing unit, the first reference voltage generation unit, the second reference voltage generation unit, control unit, isolated location and feedback clamp bit location; Said first comparing unit, second comparing unit all have normal phase input end, inverting input and output; The inverting input of said first comparing unit is used to receive supply voltage, and the normal phase input end of first comparing unit links to each other with the first reference voltage generation unit, and the output of first comparing unit links to each other with control unit; The inverting input of second comparing unit links to each other with the second reference voltage generation unit; The normal phase input end of second comparing unit receives supply voltage through isolated location, and the output of second comparing unit connects the positive input of second comparing unit through the feedback clamp bit location, and the output of second comparing unit also links to each other with control unit; Wherein, control unit is controlled circuit turn-on or disconnection between power supply and the load according to the output result of first comparing unit and second comparing unit.
2. under-voltage protecting circuit according to claim 1 is characterized in that said under-voltage protecting circuit also comprises the switch element that is connected between power supply and the load, the controlled unit controls of the break-make of this switch element.
3. under-voltage protecting circuit according to claim 2 is characterized in that, said switch element is metal-oxide-semiconductor, triode or photoelectrical coupler.
4. under-voltage protecting circuit according to claim 1 is characterized in that, said isolated location is first resistance.
5. under-voltage protecting circuit according to claim 1; It is characterized in that; Said feedback clamp bit location comprises second resistance, the 3rd resistance and first diode; Wherein the output of second comparing unit links to each other with the anode of first diode, and the negative electrode of first diode links to each other with first end of second resistance, and second end of second resistance links to each other with first end of the 3rd resistance; The second end ground connection of the 3rd resistance, the positive input of said second comparing unit are connected in any point between first end of second end and the 3rd resistance of second resistance.
6. under-voltage protecting circuit according to claim 1; It is characterized in that; The said first reference voltage generation unit comprises first power supply, the 4th resistance and the 5th resistance, the normal phase input end of said first comparing unit respectively with an end of the 4th resistance, an end of the 5th resistance links to each other; The other end of said the 4th resistance links to each other with first power supply, the other end ground connection of said the 5th resistance.
7. under-voltage protecting circuit according to claim 1; It is characterized in that; The said second reference voltage generation unit comprises second source, the 6th resistance and the 7th resistance, the inverting input of said second comparing unit respectively with an end of the 6th resistance, an end of the 7th resistance links to each other; The other end of said the 6th resistance links to each other with second source, the other end ground connection of said the 7th resistance.
8. under-voltage protecting circuit according to claim 1 is characterized in that said under-voltage protecting circuit also comprises electric capacity, and an end of said electric capacity links to each other with the normal phase input end of second comparing unit, the other end ground connection of electric capacity.
9. under-voltage protecting circuit according to claim 1; It is characterized in that; Said under-voltage protecting circuit also comprises second diode and the 3rd diode, and the anode of said second diode links to each other with the output of first comparing unit, and the negative electrode of said second diode links to each other with control unit; The anode of said the 3rd diode links to each other with the output of second comparing unit, and the negative electrode of said the 3rd diode links to each other with control unit.
10. according to each described under-voltage protecting circuit of claim 1 to 9; It is characterized in that; The said first reference voltage generation unit is that the voltage that first comparing unit provides is the voltage that second comparing unit provides less than the second reference voltage generation unit, and the second reference voltage generation unit is that the voltage that provides of second comparing unit is less than the required rated voltage of load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220050104XU CN202495738U (en) | 2012-02-16 | 2012-02-16 | Undervoltage protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220050104XU CN202495738U (en) | 2012-02-16 | 2012-02-16 | Undervoltage protection circuit |
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| CN202495738U true CN202495738U (en) | 2012-10-17 |
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| CN201220050104XU Expired - Lifetime CN202495738U (en) | 2012-02-16 | 2012-02-16 | Undervoltage protection circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104052027A (en) * | 2013-03-11 | 2014-09-17 | 深圳市海洋王照明工程有限公司 | Cell undervoltage protection circuit and DC air fan |
| CN105720965A (en) * | 2014-12-01 | 2016-06-29 | 中国航空工业集团公司第六三一研究所 | Power monitoring circuit |
| CN107329517A (en) * | 2017-08-16 | 2017-11-07 | 深圳市通则技术股份有限公司 | A kind of adjustable and not reducible Self-disconnecting circuit and its method |
| CN110470897A (en) * | 2019-07-19 | 2019-11-19 | 苏州浪潮智能科技有限公司 | A kind of under-voltage detection device and method with clamper feedback function |
-
2012
- 2012-02-16 CN CN201220050104XU patent/CN202495738U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104052027A (en) * | 2013-03-11 | 2014-09-17 | 深圳市海洋王照明工程有限公司 | Cell undervoltage protection circuit and DC air fan |
| CN105720965A (en) * | 2014-12-01 | 2016-06-29 | 中国航空工业集团公司第六三一研究所 | Power monitoring circuit |
| CN105720965B (en) * | 2014-12-01 | 2018-08-03 | 中国航空工业集团公司第六三一研究所 | A kind of power supply supervisory circuit |
| CN107329517A (en) * | 2017-08-16 | 2017-11-07 | 深圳市通则技术股份有限公司 | A kind of adjustable and not reducible Self-disconnecting circuit and its method |
| CN110470897A (en) * | 2019-07-19 | 2019-11-19 | 苏州浪潮智能科技有限公司 | A kind of under-voltage detection device and method with clamper feedback function |
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Granted publication date: 20121017 |