CN100463325C - Short-circuit protection circuit with self-recovering function - Google Patents
Short-circuit protection circuit with self-recovering function Download PDFInfo
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- CN100463325C CN100463325C CNB2005100512496A CN200510051249A CN100463325C CN 100463325 C CN100463325 C CN 100463325C CN B2005100512496 A CNB2005100512496 A CN B2005100512496A CN 200510051249 A CN200510051249 A CN 200510051249A CN 100463325 C CN100463325 C CN 100463325C
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Abstract
The present invention relates to short-circuit protection having self recovery, belonging to switching power supply field. It contains voltage compensation signal delay network consisting of one integrating circuit for receiving switching power supply modulator voltage feedback loop voltage compensation signal, sense printer threshold configured network consisting of power supply reference or bleeder circuit for configuring one threshold, short circuit sensing circuit consisting of comparing circuit or device having threshold comparison function, short circuit restore circuit consisting of negative edge integrating circuit or monostable circuit, short circuit consisting of comparing circuit or driving circuit. Said invented circuit effectively reduces switching power supply working current loss raises supply unit reliability.
Description
Technical field
The present invention relates to field of switch power, relate in particular to the short-circuit protection circuit of Switching Power Supply in a kind of wide input voltage range.
Background technology
The application of Switching Power Supply at present more and more widely; in the defencive function of Switching Power Supply; generally all need output short circuit protection circuit; damage power supply and load to prevent that Switching Power Supply operating current when the short circuit is excessive, so the quality of short-circuit protection circuit performance directly affects the reliability of whole power supply.At present, the short-circuit protection circuit in the Switching Power Supply mostly adopts the operating current that detects the former limit of transformer, carries out continuous or interrupted short-circuit protection mode.
But; there is following shortcoming in the mode of the operating current on the former limit of above-mentioned this detection transformer; in the input voltage of wide region is used; the operating current on the former limit of switching mode power supply transformer is smaller when high pressure is imported; bigger during the low pressure input; it is bigger that current waveform differs, and so just makes reliable short-circuit protection performance of gamut and band capacitance load capability not to take into account, thus the problem of the too big or band capacitance load capability difference of loss when producing the Switching Power Supply short circuit.
Summary of the invention
The purpose of this circuit is exactly that the loss that the former edge work current system of the detection transformer short-circuit protection circuit that adopts in the present Switching Power Supply produces when the short circuit is big, the problem of band capacitance load capability difference in order to solve, and proposes a kind of short-circuit protection circuit with self-recovering function.
In order to realize the foregoing invention purpose, a kind of short-circuit protection circuit with self-recovering function that the present invention proposes comprises: voltage compensation signal delay network, detection signal threshold setting network, short-circuit detecting circuit, short circuit restore circuit, short circuit actuating circuit;
Described voltage compensation signal delay network is made of an integrating circuit, receiving key power supply modulator Voltage Feedback loop voltag compensating signal; Described detection signal threshold setting network is set a threshold value; Described short-circuit detecting circuit receives the signal from the voltage compensation signal delay network, compares with the threshold value that sets, and when the signal of voltage compensation signal delay network exceeds normal range (NR), is judged as short circuit; Described short circuit restore circuit receives the testing result from short-circuit detecting circuit, notes the short-circuit signal in the testing result, and keeps short-circuit signal, after the time that sets according to short circuit restore circuit delay parameter, stops the output short-circuit signal; Described short circuit restore circuit comprise two diode in series and be connected between two diodes and and the resistance and the electric capacity that connect; Described short circuit actuating circuit receives short-circuit signal, out-put supply cut-off signals, stopcock power supply.
After adopting this programme; because the adding of voltage compensation signal delay network and short circuit restore circuit; compare with the short-circuit protection circuit that detects the former edge work current system of transformer; the loss of the operating current of Switching Power Supply when having reduced short-circuit protection effectively; improved the reliability of supply unit; simultaneously; because detection signal is the voltage compensation signal of Switching Power Supply PDM keyer Voltage Feedback ring; this signal is not subjected to the influence of input voltage and capacitive load; and the time of delay of voltage compensation signal delay network and short circuit restore circuit can both independent regulation, so can take into account reliable short-circuit protection performance of Switching Power Supply gamut and band capacitance load capability simultaneously.
Description of drawings
Fig. 1 is the theory diagram of the short-circuit protection circuit that proposes of the present invention;
Fig. 2 is the short-circuit protection circuit figure according to the first embodiment of the present invention;
Fig. 3 is short-circuit protection circuit figure according to a second embodiment of the present invention.
Embodiment
A kind of short-circuit protection circuit with self-recovering function that the present invention proposes comprises: the voltage compensation signal delay network is made of an integrating circuit, receiving key power supply modulator Voltage Feedback loop voltag compensating signal; Detection signal threshold setting network is made of power supply benchmark or bleeder circuit, sets a threshold value; Short-circuit detecting circuit is made of comparison circuit or device with threshold value comparing function; The short circuit restore circuit is made of trailing edge integrating circuit or monostable circuit; The short circuit actuating circuit is made of comparison circuit or drive circuit.
Switching Power Supply pulse width modulator Voltage Feedback loop voltag compensating signal is admitted to the voltage compensation signal delay network as input signal, through after the delay of certain hour, delivering to the threshold value that short-circuit detecting circuit and detection signal threshold setting network set compares, after signal exceeds normal range (NR), be judged as short circuit, then testing result is given the short circuit restore circuit, the short circuit restore circuit is noted detected short-circuit signal and is kept a period of time, the short circuit restoring signal is to utilize the integral characteristic of short circuit restore circuit or the time-delay characteristics of monostable circuit to keep a period of time, the scope of retention time can be regulated as required voluntarily, generally be set between a few tens of milliseconds to several seconds, the time that keeps is long more, short circuit brings loss just more little, but the time of circuit Wait-to-Restore is just corresponding elongated.Simultaneously short-circuit signal is passed to the short circuit actuating circuit, make the short circuit actuating circuit at this moment between in the out-put supply cut-off signals, the work of stopcock power supply, the short-circuit signal that the short circuit restore circuit is noted keeps disappearing after a period of time, the actuating circuit of short circuit simultaneously also stops the out-put supply cut-off signals, recovers the work of Switching Power Supply.
Each several part functional circuit in the theory diagram shown in Figure 1 can adopt multiple different circuit network to realize identical functions.Fig. 2 with shown in Figure 3 be to have adopted different devices and network connection mode to finish identical functions respectively, realize two embodiment of the short-circuit protection circuit of a kind of self-recovering function that this programme proposes.
Below in conjunction with the Fig. 2 in the accompanying drawing enforcement of technical solutions according to the invention is described in further detail:
As shown in the figure, the VCC terminal provides stable operating voltage for comparator, and the COMP port is the voltage compensation end of Switching Power Supply PDM keyer Voltage Feedback ring, as input signal.The VREF port is the voltage reference of Switching Power Supply PDM keyer; the CTL port is the guard signal of output; the CTL port is a low level during guard mode; can be used for driving triode or metal-oxide-semiconductor; come the power supply of stopcock power supply PDM keyer or other breaking circuits of control switching, comparator is the device of push-and-pull output type.
The structure of described short-circuit protection circuit is: the integrating circuit that first resistance R 1, second resistance R 2 and first capacitor C 1 constitute is as the voltage compensation signal delay network; The bleeder circuit that the first diode VD1, 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 constitute is as detection signal threshold setting network; The first comparator D1A is as short-circuit detecting circuit; The second comparator D1B, the second diode VD2 are as the short circuit actuating circuit; The trailing edge integrating circuit that the 3rd diode VD3 and the 4th diode VD4, the 3rd capacitor C 3, the 8th resistance R 8 constitute is as the short circuit restore circuit.
When Switching Power Supply is in short-circuit condition; because the restriction of power supply output internal resistance; the perhaps restriction of power supply maximum output current; output voltage descends; voltage compensation end COMP will jump to high level; this high level is through first resistance R 1; behind the voltage compensation signal delay network that second resistance R 2 and first capacitor C 1 constitute; be added to the in-phase input end of the first comparator D1A; because this level surpasses the set threshold level of the first comparator D1A inverting input; so the output of first comparator D1A upset becoming high level; the high level of the first comparator D1A output passes through the 3rd diode VD3 to 3 quick charges of the 3rd capacitor C; the inverting input level of the second comparator D1B surpasses the set threshold level of in-phase input end; the output upset of the second comparator D1B becomes low level; by the second diode VD2 CTL end is dragged down; the output short circuit protection control signal, the work of stopcock power supply.
After the protection action; the blackout of COMP end becomes low level; the level of the first comparator D1A in-phase input end is lower than the set threshold level of the first comparator D1A inverting input; the output switching activity of the first comparator D1A is a low level; because the 3rd diode VD3 oppositely ends; the 3rd capacitor C 3 and the 8th resistance R 8 are slowly discharged; the inverting input level of the second comparator D1B is higher than in-phase input end in a period of time; the second comparator D1B is output as low level; so the low level short-circuit protection signal of CTL end still can keep a period of time; the interior during this period maintenance of Switching Power Supply is turn-offed, reduce the loss that short circuit brings.
Inverting input level up to the second comparator D1B is reduced to below the set threshold level of in-phase input end; the output of the second comparator D1B overturns again and becomes high level; the second diode VD2 is oppositely ended; the saltus step of CTL end is high level or high-impedance state; finish short-circuit protection, Switching Power Supply restarts.If short circuit condition is eliminated, then power supply enters normal operating conditions, if short circuit condition still exists, then this short-circuit protection circuit reenters the short-circuit protection state.
Because the 3rd capacitor C 3 and the 8th resistance R 8 have bigger time constant, the short-circuit protection time is longer, and the loss of short-circuit protection can be done smallerly.And,, can regulate the delay network of the first comparator D1A in-phase input end, first resistance R 1, second resistance R 2, first capacitor C, 1 formation, the fluctuation of COMP end during with the filtering starting up at different capacitive loads.So can take into account reliable short-circuit protection performance of Switching Power Supply gamut and band capacitance load capability.
Next the Fig. 3 in conjunction with the accompanying drawings is described in further detail the enforcement of technical scheme:
Among the figure; the VCC terminal provides stable operating voltage for comparator; the COMP port is the voltage compensation end of Switching Power Supply PDM keyer Voltage Feedback ring; as input signal; the CTL port is the guard signal of output, and the CTL port is a low level during guard mode, can be used for driving triode or metal-oxide-semiconductor to wait the power supply of stopcock power supply PDM keyer or other breaking circuits of control switching; pressurizer D1 is adjustable shunt regulator, for example LM431.
The structure of short-circuit protection circuit is: the integrating circuit that the 9th resistance R 9, the tenth resistance R 10 and the 4th capacitor C 4 constitute is as the voltage compensation signal delay network; The threshold value comparison circuit that adjustable shunt regulator D1, the first triode VT1, the 11 resistance R the 11, the 12 resistance R the 12, the 13 resistance R the 13, the 14 resistance R 14 constitute is as short-circuit detecting circuit; The voltage reference that adjustable shunt regulator D1 inside carries constitutes detection signal threshold setting network; The drive circuit that the 15 resistance R 15, the second triode VT2 constitute is as the short circuit actuating circuit; The trailing edge integrating circuit that the 5th diode VD5 and the 6th diode VD6, the 6th capacitor C the 6, the 16 resistance R 16 constitute is as the short circuit restore circuit, and the 5th capacitor C 5 is a power filtering capacitor, is connected between power supply VCC and the ground.
One end of the 9th resistance R 9 connects the voltage compensation end COMP port of Switching Power Supply PDM keyer Voltage Feedback ring, the other end is connected to the tenth resistance R 10, the 4th capacitor C 4, the reference edge of the 12 resistance R 12 and adjustable shunt regulator D1, the tenth resistance R 10, the other end of the 4th capacitor C 4 all is connected with ground, the other end of the 12 resistance R 12 connects the 14 resistance R 14, the collector electrode of the anode of the 5th diode VD5 and the first triode VT1, the anode of adjustable shunt regulator D1 connects ground, negative electrode connects the 11 resistance R 11, the other end of the 14 resistance R 14 connects ground, the negative electrode of the 5th diode VD5 connects the anode of the 6th diode VD6, the 6th capacitor C 6, the 15 resistance R 15 and the 16 resistance R 16, the other end of the 11 resistance R 11 connects the base stage of the 13 resistance R 13 and the first triode VT1, the other end of the 6th capacitor C 6 connects ground, the other end of the 15 resistance R 15 is connected to the base stage of the second triode VT2, the other end of the 16 resistance R 16 connects ground, the other end of the 13 resistance R 13 connects power supply VCC, the emitter of first triode (VT1), the negative electrode of the 5th capacitor C 5 and the 6th diode VD6, the emitter of the second triode VT2 connects ground, collector electrode connects control end CTL, and being connected between power supply VCC and the ground is the 5th capacitor C 5 with power filter function.
When Switching Power Supply is in short-circuit condition, because the restriction of power supply output internal resistance, the perhaps restriction of power supply maximum output current, output voltage descends, voltage compensation end COMP will jump to high level, this high level is through the 9th resistance R 9, behind the voltage compensation signal delay network of the tenth resistance R 10 and the 4th capacitor C 4, be added to the reference edge of adjustable shunt regulator D1, because this level surpasses the set threshold level of adjustable shunt regulator D1 internal reference voltage source, so adjustable shunt regulator D1 conducting, the negative electrode upset of adjustable shunt regulator D1 becomes low level, base current is provided for the first triode VT1 by the 11 resistance R 11, make the first triode VT1 conducting, the collector electrode of the first triode VT1 becomes high level, and certain positive feedback current is provided for the reference edge of adjustable shunt regulator D1 by the 12 resistance R 12, make the more reliable conducting of adjustable shunt regulator D1.
The high level of the collector electrode of the first triode VT1 passes through the 5th diode VD5 to 6 quick charges of the 6th capacitor C; the negative electrode of the 5th diode VD5 becomes high level; this high level provides base current for the second triode VT2 by the 15 resistance R 15; make the triode conducting; output CTL upset becomes low level; the output short circuit protection control signal, the work of stopcock power supply.
After the protection action; the blackout of COMP end becomes low level; the level of adjustable shunt regulator D1 reference edge is lower than its inner reference level; adjustable shunt regulator D1 ends; the electric current that flows through the 11 resistance R 11 sharply reduces; after 13 shuntings of the 13 resistance R; the first triode VT1 loses base current; the first triode VT1 ends; the collector electrode of the first triode VT1 becomes low level; because the 5th diode VD5 oppositely ends, the 6th capacitor C 6 and the 16 resistance R 16 are slowly discharged, and still base current are provided for the second triode VT2 by the 15 resistance R 15 in a period of time; triode is still conducting during this period; so the low level short-circuit protection signal of CTL end still can keep a period of time, the interior during this period maintenance of Switching Power Supply is turn-offed, reduce the loss that short circuit brings.
Be reduced to after the base-emitter turning-on voltage that is lower than the second triode VT2 up to the voltage on the 6th capacitor C 6; base current disappears; the second triode VT2 recovers again to end; high level or high-impedance state are returned in the saltus step of CTL end, finish short-circuit protection, and Switching Power Supply restarts; if short circuit condition is eliminated; then power supply enters normal operating conditions, if short circuit condition still exists, then this short-circuit protection circuit reenters the short-circuit protection state.
Equally; because the 6th capacitor C 6 and the 16 resistance R 16 can be provided with bigger time constant; it is very long that the short-circuit protection time can be done; so the loss of short-circuit protection can be done smallerly; and,, can regulate the delay network that resistance R 9, resistance R 10 and capacitor C 4 constitute equally at different capacitive loads; the fluctuation of COMP end during with the filtering starting up is so can take into account reliable short-circuit protection performance of Switching Power Supply gamut and band capacitance load capability.
By to the enumerating of above two embodiment, the formation network of each square frame in convertible this programme Fig. 1 theory diagram makes up with the functional module of identical function, realizes the short-circuit protection circuit of this programme.
Disclosed herein a kind ofly can be widely used in all kinds of switch power supply systems from recovering short-circuit protection circuit particularly requires wide input voltage range, during short-circuit protection loss little, the band capacitance load capability is strong, in the high Switching Power Supply of reliability.
Claims (6)
1. the short-circuit protection circuit with self-recovering function is characterized in that, comprising: voltage compensation signal delay network, detection signal threshold setting network, short-circuit detecting circuit, short circuit restore circuit, short circuit actuating circuit;
Described voltage compensation signal delay network is made of an integrating circuit, receiving key power supply modulator Voltage Feedback loop voltag compensating signal;
Described detection signal threshold setting network is set a threshold value;
Described short-circuit detecting circuit receives the signal from the voltage compensation signal delay network, compares with the threshold value that sets, and when the signal of voltage compensation signal delay network exceeds normal range (NR), is judged as short circuit;
Described short circuit restore circuit receives the short-circuit signal from short-circuit detecting circuit, and keeps short-circuit signal, after the time that sets according to short circuit restore circuit delay parameter, stops the output short-circuit signal; Described short circuit restore circuit comprises two diodes, resistance and electric capacity, the anode that the anode connection short-circuit detecting circuit of one diode, its negative electrode connect another diode, the negative electrode of another diode connects power supply, one of resistance is terminated at the tie point of two diodes, the other end ground connection of resistance, one of electric capacity is terminated at the tie point of two diodes, the other end ground connection of electric capacity;
Described short circuit actuating circuit receives short-circuit signal, out-put supply cut-off signals, stopcock power supply.
2. circuit according to claim 1 is characterized in that: described voltage compensation signal delay network is made up of the integrating circuit that first resistance (R1), second resistance (R2) and first electric capacity (C1) constitute; Described detection signal threshold setting network comprises first diode (VD1), the 3rd resistance (R3), the 4th resistance (R4), the 5th resistance (R5), the 6th resistance (R6), the 7th resistance (R7); Described short-circuit detecting circuit is made of first comparator (D1A) with threshold value comparing function; Two diodes of described short circuit restore circuit are respectively the 3rd diode (VD3) and the 4th diode (VD4), and the electric capacity of described short circuit restore circuit is the 3rd electric capacity (C3), and the resistance of described short circuit restore circuit is the 8th resistance (R8); Described short circuit actuating circuit is made of second comparator (D1B), second diode (VD2); First resistance (R1) and second resistance (R2) series connection, second resistance (R2) and first electric capacity (C1) parallel connection, the tie point of first resistance (R1) and second resistance (R2) series connection is connected to the in-phase input end of first comparator (D1A), the anode of first diode (VD1) meets port VREF, the VREF port is the voltage reference of Switching Power Supply PDM keyer, the negative electrode of first diode (VD1) is connected to an end of the 3rd resistance (R3) and an end of the 5th resistance (R5), the other end of the 3rd resistance (R3) links to each other with the 4th resistance (R4) and constitutes potential-divider network over the ground, the tie point that the 3rd resistance (R3) is connected with the 4th resistance (R4) is connected to the inverting input of first comparator (D1A), the other end of the 5th resistance (R5) and the 6th resistance (R6), the tie point of the potential-divider network that the 7th resistance (R7) constitutes connects, one end of the 6th resistance (R6) connects power supply VCC, the other end of the 6th resistance (R6) connects the 7th resistance (R7), the other end of the 7th resistance (R7) connects ground, the 6th resistance (R6), the tie point of the potential-divider network that the 7th resistance (R7) constitutes is connected to the in-phase input end of second comparator (D1B) simultaneously, the inverting input of second comparator (DIB) connects the negative electrode of the 3rd diode (VD3) in the short circuit restore circuit, the anode of the 4th diode (VD4), the anode of the 3rd diode (VD3) is connected to the output of first comparator (D1A), the negative electrode of the 4th diode (VD4) in the short circuit restore circuit is connected to power supply VCC, the inverting input of second comparator (D1B) over the ground also series connection be connected to the 3rd electric capacity (C3) and the 8th resistance (R8) in the short circuit restore circuit, the output of second comparator (D1B) is connected to the negative electrode of second diode (VD2) in the short circuit actuating circuit, the anode of second diode (VD2) connects control end CTL, and being connected between power supply VCC and the ground is second electric capacity (C2) with power filter function.
3. circuit according to claim 1 is characterized in that, described voltage compensation signal delay network is made up of the integrating circuit that the 9th resistance (R9), the tenth resistance (R10) and the 4th electric capacity (C4) constitute; Described short-circuit detecting circuit is made up of than circuit the threshold ratio that adjustable shunt regulator (D1), first triode (VT1), the 11 resistance (R11), the 12 resistance (R12), the 13 resistance (R13), the 14 resistance (R14) constitute; The voltage reference power supply that described adjustable shunt regulator (D1) inside carries constitutes detection signal threshold setting network; Described short circuit actuating circuit is made of the 15 resistance (R15), second triode (VT2); The diode of described short circuit restore circuit comprises the 5th diode (VD5), the 6th diode (VD6), and the electric capacity of described short circuit restore circuit is the 6th electric capacity (C6), and the resistance of described short circuit restore circuit is the 16 resistance (R16); One end of the 9th resistance (R9) connects the voltage compensation end COMP port of Switching Power Supply PDM keyer Voltage Feedback ring, the other end of the 9th resistance (R9) is connected to an end of the tenth resistance (R10), one end of the 4th electric capacity (C4), the reference edge of the 12 resistance (R12) and adjustable shunt regulator (D1), the other end of the tenth resistance (R10), the other end of the 4th electric capacity (C4) all is connected with ground, the other end of the 12 resistance (R12) connects the 14 resistance (R14), the collector electrode of the anode of the 5th diode (VD5) and first triode (VT1), the anode of adjustable shunt regulator (D1) connects ground, negative electrode connects the 11 resistance (R11), the other end of the 14 resistance (R14) connects ground, the negative electrode of the 5th diode (VD5) connects the anode of the 6th diode (VD6), the 6th electric capacity (C6), the 15 resistance (R15) and the 16 resistance (R16), the other end of the 11 resistance (R11) connects the base stage of the 13 resistance (R13) and first triode (VT1), the other end of the 6th electric capacity (C6) connects ground, the other end of the 15 resistance (R15) is connected to the base stage of second triode (VT2), the other end of the 16 resistance (R16) connects ground, the other end of the 13 resistance (R13) connects power supply VCC, the emitter of first triode (VT1), the negative electrode of the 5th electric capacity (C5) and the 6th diode (VD6), the emitter of second triode (VT2) connects ground, collector electrode connects control end CTL, and being connected between power supply VCC and the ground is the 5th electric capacity (C5) with power filter function.
4. circuit according to claim 3 is characterized in that, described adjustable shunt regulator is LM431.
5. according to any described circuit of claim 1-4, it is characterized in that, when described control end CTL is low level, come the power supply of stopcock power supply PDM keyer or the breaking circuit of control switching with driving triode, power MOS pipe.
6. circuit according to claim 5 is characterized in that, resistance and electric capacity in the described voltage compensation signal delay network are adjustable.
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| CNB2005100512496A CN100463325C (en) | 2005-03-03 | 2005-03-03 | Short-circuit protection circuit with self-recovering function |
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| CNB2005100512496A CN100463325C (en) | 2005-03-03 | 2005-03-03 | Short-circuit protection circuit with self-recovering function |
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| CN100463325C true CN100463325C (en) | 2009-02-18 |
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| CN101174769B (en) * | 2006-10-31 | 2011-04-20 | 中兴通讯股份有限公司 | Self-recovery multifunctional protection circuit |
| JP5184947B2 (en) * | 2008-04-09 | 2013-04-17 | 株式会社東海理化電機製作所 | Short circuit protection circuit and short circuit protection method |
| CN101577419A (en) * | 2009-06-22 | 2009-11-11 | 安徽摆客动力技术有限公司 | Selflocking direct current supply short circuit protection circuit |
| CN102412613B (en) * | 2011-12-29 | 2013-08-07 | 西安科技大学 | Intrinsically safe battery with self recovery function |
| CN102969883B (en) * | 2012-12-07 | 2016-05-04 | 深圳市核达中远通电源技术有限公司 | A kind of Switching Power Supply hiccup protections and delay protection circuit |
| KR101825767B1 (en) * | 2013-08-20 | 2018-02-05 | 주식회사 만도 | Device and method for restoring mechanical relay normal condition from temporary stuck failure |
| JPWO2015182669A1 (en) * | 2014-05-29 | 2017-04-27 | カルソニックカンセイ株式会社 | Semiconductor switching element drive circuit |
| EP3327883B1 (en) * | 2015-07-17 | 2020-09-09 | Hitachi Industrial Equipment Systems Co., Ltd. | Shutoff control method and power conversion device using same |
| CN105356863B (en) * | 2015-09-29 | 2018-04-13 | 贵州剑星科技有限公司 | A kind of fast recovery detection delay circuit with monostable step response |
| CN109004620A (en) * | 2018-09-07 | 2018-12-14 | 奥克斯空调股份有限公司 | A kind of IGBT current foldback circuit and air conditioner |
| CN110265966B (en) * | 2019-07-15 | 2024-03-12 | 深圳市图灵科创产业发展有限公司 | Overload and short-circuit protection circuit |
| CN110932238B (en) * | 2019-12-11 | 2022-04-08 | 武汉宝久创美科技有限公司 | Overcurrent and short-circuit protection circuit for electromagnetic brake |
| CN111413644A (en) * | 2020-04-27 | 2020-07-14 | 力高(山东)新能源技术有限公司 | Short circuit recovery detection method of energy storage battery management system |
| CN113241940B (en) * | 2021-07-12 | 2021-09-10 | 上海芯龙半导体技术股份有限公司 | Overcurrent protection circuit and switching power supply chip |
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| CN1829031A (en) | 2006-09-06 |
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