CN202309527U - Flyback switching power supply output short-circuit protection circuit - Google Patents
Flyback switching power supply output short-circuit protection circuit Download PDFInfo
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- CN202309527U CN202309527U CN2011204407860U CN201120440786U CN202309527U CN 202309527 U CN202309527 U CN 202309527U CN 2011204407860 U CN2011204407860 U CN 2011204407860U CN 201120440786 U CN201120440786 U CN 201120440786U CN 202309527 U CN202309527 U CN 202309527U
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Abstract
The utility model provides a flyback switching power supply output short-circuit protection circuit. A signal shaping module is used for filtering high-frequency components of leakage inductance oscillation frequency on a virtual channel connection (VCC) power supply winding; a signal rectification and filtration module is used for performing rectification and filtration and outputting a stable direct current signal; and the direct current signal is only associated with the turn ratio of each winding of a transformer and is not associated with coupling among windings of the transformer. According to the circuit, the problem of coupling among windings of the transformer is not taken into consideration. When a switching power supply is subjected to output short circuit, voltage of the VCC power supply winding is reduced, so that the direct current signal is reduced; and when the direct current signal is detected to be reduced to a first set value, a signal control module 300 controls a VCC capacitor to discharge quickly, an integrated circuit (IC) is switched off and the switching power supply stops output. The VCC capacitor is short in discharging time and long in charging time, so when the switching power supply is subjected to output short circuit, voltage stress and current stress born by components are small and high-reliability output short-circuit protection is realized.
Description
Technical field
The utility model relates to the switch power technology field, particularly a kind of inverse-excitation type switch power-supply output short circuit protection circuit.
Background technology
Inverse-excitation type switch power-supply is a kind of most widely used power supply at present, all uses the Switching Power Supply of the type in many consumer electronics products.Products such as LED television set, DVD, STB, charger for mobile phone for example.Yet in the product practical application; Owing to the unpredictable reason of various peripheral hardwares; When the short circuit of Switching Power Supply output abnormality; Switching Power Supply can not realize reliable short-circuit protection or realize guard mode that voltage, electric current, the power stress of the element of Switching Power Supply and external equipment are very big at this moment, will cause component wear.
At present, there are two kinds of schemes to realize output short circuit protection in the prior art, introduce below in conjunction with accompanying drawing.
Referring to Fig. 1, this figure is a kind of inverse-excitation type switch power-supply topological diagram that provides in the prior art.
The operation principle of this output short circuit protection is: when the output short-circuit of a certain road (Vout1, Vout2 or Vout3); This road output winding voltage descends, because Transformer Winding turn ratio relation, thereby cause the induced voltage of the VCC power supply winding N2 of switch power controller master chip IC to descend; Cause VCC to descend; When VCC was lower than the under-voltage level of IC, IC turn-offed, and power supply stops to provide energy to output.HVDC VDC charges for again the VCC of IC after importing the AC power supplies rectification this moment.When the VCC charging voltage reached the startup operation level, then IC started working again.If this moment, output remained short-circuit condition, then power supply repeats above action again.Whole power supply is in a kind of state of having the hiccups when output short-circuit, promptly power supply is worked for a moment, does not work for a moment, and output voltage is constantly restarted.Power work is determined that this time, longer voltage, the current stress that output element is produced was more little blanking time fully by the VCC electric capacity (C36) and the starting resistance (R5 of series connection, R42 and R4) of power supply, input power also can be more little, and vice versa.
Because C36 is the storage capacitor of IC, generally more than 10uF, capacity is bigger for its capacity.And for guaranteeing the Switching Power Supply operate as normal, start operation level than the big 5V-10V of the under-voltage level of IC, so when the Switching Power Supply output short-circuit, the time that this C36 voltage discharges into the under-voltage level of IC understands long, generally has more than the 30ms.Switching Power Supply voltage, electric current at this moment all can be bigger, might cause damage to power supply itself and connection device thereof or circuit.
And in multichannel output inverse-excitation type switch power-supply, Transformer Winding is more, and existing transformer is that handwork and technology are difficult to control on basically, and the coupling between winding is relatively poor, and leakage inductance is bigger.Thereby cause when the output short-circuit of a certain road,, cause VCC power supply winding parasitic oscillation voltage amplitude bigger, cause VCC voltage to keep or continue and rise, thereby can not realize output short circuit protection because leakage inductance is very big.Finally cause Switching Power Supply to lose efficacy or its connection device or circuit damage.
Referring to Fig. 2, this figure is the another kind of inverse-excitation type switch power-supply topological diagram that provides in the prior art.
The operation principle of this output short circuit protection is: when the feedback pin FB of IC level was kept high level and surpassed IC inner setting FB and hold time, IC turn-offed and realizes output short circuit protection.
For example, when main road Vout3 (output voltage is as voltage feedback signal) output short-circuit, the Vout3 output voltage drops to low level; Causing voltage feedback signal is low level, and the FB level rising is to high level and keep, and the time T of keeping high level when the FB level surpasses IC inner setting FB when holding time; Then IC turn-offs; The output of switch power controller IC no pulse width modulated (PWM, Pulse Width Modulation) signal, this moment, output voltage descended.
When auxiliary route Vout1 or Vout2 output short-circuit, the auxiliary route output voltage drops to low level, causes auxiliary winding voltage to descend.Because there is certain turn ratio relation between transformer main road and auxiliary route winding,, thereby cause the main road output voltage to descend so auxiliary winding voltage decline can cause that the main road winding voltage descends.And then cause the FB level rising to high level and keep, and causing that at last IC turn-offs, the main road output voltage descends.
In sum, when output voltage descended, VCC voltage also can descend; When IC dropped to the under-voltage level of IC, IC was restarted, when VCC rises to starting resistor; IC work; This moment, IC detected the FB level again, if when the FB level is kept the time T of high level and surpassed IC inner setting FB and hold time, then power supply IC turn-offs again.If output short-circuit keeps, then Switching Power Supply gets into the pattern of having the hiccups.
The shortcoming of this kind short-circuit protection is, when Switching Power Supply started, there was electric capacity in output, starts moment to set up this process to exporting, and the FB level all is a high level.With the increase of output capacitive loading, the time that the FB level is kept high level increases.Present each Switching Power Supply IC producer is provided with a FB and holds time, and generally this time is greater than 30ms.It is long more that but IC inner setting FB holds time, and will cause increase of Switching Power Supply short-circuit power and element voltage stress, current stress to increase, and influences the reliability of element.
For multichannel output inverse-excitation type switch power-supply, because Transformer Winding is many, main road and the coupling of each auxiliary route are bad, and in the time of will causing the auxiliary route output short-circuit, it is normal that main road voltage keeps.Like this, Switching Power Supply can not realize short-circuit protection, finally causes Switching Power Supply to lose efficacy.
In sum, present output short circuit protection can cause the voltage stress of element and current stress bigger, and because the coupling between each winding of transformer, will cause Switching Power Supply to lose efficacy or its connection device or circuit damage.
The utility model content
The technical problem that the utility model will solve provides a kind of inverse-excitation type switch power-supply output short circuit protection circuit, can realize output short circuit protection, and the voltage stress and the current stress of element are less, and needn't consider the coupled problem between each winding of transformer.
The utility model provides a kind of inverse-excitation type switch power-supply output short circuit protection circuit, comprising: signal shaping module, signal rectification filtration module and signal controlling module;
The input of said signal shaping module connects VCC power supply winding, with the radio-frequency component in the leakage inductance frequency of oscillation on the filtering VCC power supply winding; VCC is the power supply of switch power controller master chip;
The input of said signal rectification filtration module connects the output of signal shaping module, and the output signal of signal shaping module is carried out rectifying and wave-filtering, export stable direct current signal to said signal controlling module;
Said signal controlling module detects said direct current signal, and when said direct current signal was lower than first current setting value, control VCC capacitor discharge descended VCC, and when VCC dropped to the under-voltage level of IC, IC turn-offed pwm signal output; When said direct current signal was lower than second current setting value, control VCC electric capacity stopped discharge; VCC is through the VCC capacity earth; Said first current setting value is greater than second current setting value.
Preferably, said signal shaping module comprises the tenth resistance and the 24 electric capacity;
The anode of said VCC power supply winding connects first end of the 24 electric capacity, the negativing ending grounding of VCC power supply winding, the second end ground connection of the 24 electric capacity through the tenth resistance.
Preferably, said signal rectification filtration module comprises: the 16 diode and the 25 electric capacity;
The anode of said the 16 diode connects first end of said the 24 electric capacity, and the negative electrode of said the 16 diode connects first end of said the 25 electric capacity, the second end ground connection of said the 25 electric capacity.
Preferably, said signal controlling module comprises: the 21 resistance, the 25 resistance, the 27 resistance, second switch pipe, the 3rd switching tube, the 28 resistance, the 26 electric capacity;
Be connected in parallel on the two ends of said the 25 electric capacity after said the 21 resistance and the series connection of the 25 resistance;
The control end of said second switch pipe connects the common port of the 21 resistance and the 25 resistance;
The first end ground connection of said second switch pipe, second end connects VCC end through the 27 resistance; Said VCC end connects VCC through the 18 diode; The one VCC end is through the 7th capacity earth;
Said the 3rd control end of switching tube connects second end of second switch pipe, the first end ground connection of the 3rd switching tube, and second end connects VCC;
The 3rd control end of switching tube is through the 26 capacity earth, simultaneously through the 28 grounding through resistance.
Preferably, said second switch pipe and the 3rd switching tube are the NMOS pipe;
First end of said second switch pipe and the 3rd switching tube is a source electrode, and second end is drain electrode.
Preferably, the capacity of said the 25 electric capacity is less than the capacity of said the 7th electric capacity.
Compared with prior art, the utlity model has following advantage:
The inverse-excitation type switch power-supply output short circuit protection circuit that the utility model provides; Carry out exporting stable direct current signal behind the rectifying and wave-filtering through radio-frequency component in the leakage inductance frequency of oscillation on the signal shaping module filtering VCC power supply winding and signal rectification filtration module; This direct current signal only has relation with the turn ratio of each winding of transformer, and and the coupling between each winding of transformer irrelevant.Therefore, this circuit needn't be considered the coupled problem between each winding of transformer.And when the Switching Power Supply output short-circuit, the voltage on the VCC power supply winding can descend; And then cause said direct current signal to descend, drop to when being lower than first set point 300 control VCC electric capacity repid discharges of signal controlling module when detecting direct current signal; IC turn-offs, and Switching Power Supply stops output.Because the VCC capacitor discharge time is short, the charging interval is long, so during the Switching Power Supply output short-circuit, voltage stress and current stress that element bears are less, thereby the realization high reliability output short circuit protection.
Description of drawings
Fig. 1 is a kind of inverse-excitation type switch power-supply topological diagram that provides in the prior art;
Fig. 2 is the another kind of inverse-excitation type switch power-supply topological diagram that provides in the prior art;
Fig. 3 is inverse-excitation type switch power-supply output short circuit protection circuit embodiment one structure chart that the utility model provides;
Fig. 4 is inverse-excitation type switch power-supply output short circuit protection circuit embodiment two circuit diagrams that the utility model provides.
Embodiment
For above-mentioned purpose, the feature and advantage that make the utility model can be more obviously understandable, the embodiment of the utility model is done detailed explanation below in conjunction with accompanying drawing.
Referring to Fig. 3, this figure is inverse-excitation type switch power-supply output short circuit protection circuit embodiment one structure chart that the utility model provides.
The inverse-excitation type switch power-supply output short circuit protection circuit that the utility model embodiment provides comprises: signal shaping module 100, signal rectification filtration module 200 and signal controlling module 300;
The input of said signal shaping module 100 connects VCC power supply winding, with the radio-frequency component in the leakage inductance frequency of oscillation on the filtering VCC power supply winding; VCC is the power supply of switch power controller master chip;
The input of said signal rectification filtration module 200 connects the output of signal shaping module 100, and the output signal of signal shaping module 100 is carried out rectifying and wave-filtering, export stable direct current signal to said signal controlling module 300;
Said signal controlling module 300 detects said direct current signal, and when said direct current signal was lower than first current setting value, control VCC capacitor discharge descended VCC, and when VCC dropped to the under-voltage level of IC, IC turn-offed pwm signal output; When said direct current signal was lower than second current setting value, control VCC electric capacity stopped discharge; VCC is through the VCC capacity earth; Said first current setting value is greater than second current setting value.
The inverse-excitation type switch power-supply output short circuit protection circuit that the utility model provides; Carry out exporting stable direct current signal behind the rectifying and wave-filtering through radio-frequency component in the leakage inductance frequency of oscillation on the signal shaping module 100 filtering VCC power supply winding and signal rectification filtration module 200; This direct current signal only has relation with the turn ratio of each winding of transformer, and and the coupling between each winding of transformer irrelevant.Therefore, this circuit needn't be considered the coupled problem between each winding of transformer.And when the Switching Power Supply output short-circuit, the voltage on the VCC power supply winding can descend; And then cause said direct current signal to descend, drop to when being lower than first set point 300 control VCC electric capacity repid discharges of signal controlling module when detecting direct current signal; IC turn-offs, and Switching Power Supply stops output.Because the VCC capacitor discharge time is short, the charging interval is long, so during the Switching Power Supply output short-circuit, voltage stress and current stress that element bears are less, thereby the realization high reliability output short circuit protection.
Referring to Fig. 4, this figure is inverse-excitation type switch power-supply output short circuit protection circuit embodiment two circuit diagrams that the utility model provides.
Introduce the operation principle of the inverse-excitation type switch power-supply output short circuit protection circuit that the utility model provides in detail below in conjunction with Fig. 4.
The short-circuit protection circuit that present embodiment provides specifically comprises three partial circuit modules, signal shaping module, signal rectification filtration module and signal controlling module for circuit in the frame of broken lines among Fig. 4.
Wherein, signal shaping module comprises the tenth resistance R 10 and the 24 capacitor C 24;
The anode of said VCC power supply winding N2 passes through first end that the tenth resistance R 10 connects the 24 capacitor C 24, the negativing ending grounding of VCC power supply winding N2, the second end ground connection of the 24 capacitor C 24.
The signal rectification filtration module comprises: the 16 diode D16 and the 25 capacitor C 25;
The anode of said the 16 diode D16 connects first end of said the 24 capacitor C 24, and the negative electrode of said the 16 diode D16 connects first end of said the 25 capacitor C 25, the second end ground connection of said the 25 capacitor C 25.
The signal controlling module comprises: the 21 resistance R the 21, the 25 resistance R the 25, the 27 resistance R 27, second switch pipe Q2, the 3rd switching tube Q3, the 28 resistance R the 28, the 26 capacitor C 26;
Be connected in parallel on the two ends of said the 25 capacitor C 25 after said the 21 resistance R 21 and 25 series connection of the 25 resistance R;
The control end of said second switch pipe Q2 connects the common port of the 21 resistance R 21 and the 25 resistance R 25;
The first end ground connection of said second switch pipe Q2, second end connects VCC end VCC1 through the 27 resistance R 27; Said VCC end VCC1 connects VCC through the 18 diode D28; The one VCC end VCC1 is through the 7th capacitor C 7 ground connection;
The control end of said the 3rd switching tube Q3 connects second end of second switch pipe Q2, the first end ground connection of the 3rd switching tube Q3, and second end connects VCC;
The control end of the 3rd switching tube Q3 is through the 26 capacitor C 26 ground connection, simultaneously through the 28 resistance R 28 ground connection.
In the present embodiment, said second switch pipe Q2 and the 3rd switching tube Q3 all adopt the NMOS pipe;
First end of said second switch pipe Q2 and the 3rd switching tube Q3 is a source electrode, and second end is drain electrode.
Its operation principle is following: the signal source of R10, C24 is taken from VCC power supply winding N2.
The last voltage of N2 comprises positive negative pulse stuffing signal and leakage inductance oscillator signal, and (general positive negative pulse stuffing signal frequency is tens K to, hundred K; And the leakage inductance oscillation signal frequency is more than several M), the signal shaping module of utilizing R10 and C24 formation is with the filtering of leakage inductance frequency of oscillation radio-frequency component.The signal rectification filtration module that constitutes through D16 and C25 again carries out the stable direct current signal of output behind the rectifying and wave-filtering, and the size of this direct current signal is relevant with the turn ratio of Transformer Winding (ignoring diode drop difference) only, and and the coupling between Transformer Winding have nothing to do.
When the output short-circuit of a certain road of Switching Power Supply (for example Vout3), output voltage descends, and N3 direct impulse voltage descends, and according to the relation of the turn ratio between each winding of transformer, N2 direct impulse voltage descends, and causes C25 voltage to descend.
When the C25 voltage drops to when being enough to make Q2 to turn-off, the Q2 switching tube turn-offs, the conducting of Q3 switching tube, and what this moment, said first current setting value was corresponding is the electric current that Q2 is turn-offed, the i.e. electric current of Q2 grid.During the Q3 conducting, 36 repid discharges of VCC capacitor C, when VCC drops to when being lower than the under-voltage level of IC, IC turn-offs pwm signal output, and Switching Power Supply stops output.This moment, the VCC capacitor C 36 still continued the discharge through Q3, till VCC1 voltage can not make Q3 open, just stopped discharge, promptly said second current setting value correspondence be the electric current that can make the Q3 conducting, i.e. the electric current of Q3 grid.Have no progeny when Q3 closes, high direct voltage VDC charges to VCC through starting resistance (R5 of series connection, R42 and R4) again, and when VCC voltage rose to IC startup operation level, IC started working again.The voltage at VCC1 and C25 two ends all begins to rise.
Because the C25 capacitance is less than VCC1 capacitor C 7, so when IC started, the last voltage of C25 always rose faster than the voltage on the C7, makes Q2 open-minded, Q3 turn-offs.If this moment, output remained short circuit, then repeat above action.
Because the 36 power down times of VCC capacitor C are short, and the charging interval is long, so the voltage stress and the current stress of element is less during the Switching Power Supply short circuit during the short-circuit protection, thereby can realize the high reliability output short circuit protection.
If output short-circuit is removed, then C25 is maintained high level, the Q2 conducting, and Q3 ends, the Switching Power Supply operate as normal.
Need to prove; The inverse-excitation type switch power-supply output short circuit protection circuit that present embodiment provides does not limit the way of output; Be that example is introduced with three output branch roads among Fig. 4, the Switching Power Supply of other a plurality of output branch roads is suitable for the output short circuit protection circuit that the utility model provides equally.
The above only is the preferred embodiment of the utility model, is not the utility model is done any pro forma restriction.Though the utility model discloses as above with preferred embodiment, yet be not in order to limit the utility model.Any those of ordinary skill in the art; Do not breaking away under the utility model technical scheme scope situation; All the method for above-mentioned announcement capable of using and technology contents are made many possible changes and modification to the utility model technical scheme, or are revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from the utility model technical scheme, all still belongs in the scope of the utility model technical scheme protection any simple modification, equivalent variations and modification that above embodiment did according to the technical spirit of the utility model.
Claims (6)
1. an inverse-excitation type switch power-supply output short circuit protection circuit is characterized in that, comprising: signal shaping module, signal rectification filtration module and signal controlling module;
The input of said signal shaping module connects VCC power supply winding, with the radio-frequency component in the leakage inductance frequency of oscillation on the filtering VCC power supply winding; VCC is the power supply of switch power controller master chip;
The input of said signal rectification filtration module connects the output of signal shaping module, and the output signal of signal shaping module is carried out rectifying and wave-filtering, export stable direct current signal to said signal controlling module;
Said signal controlling module detects said direct current signal, and when said direct current signal was lower than first current setting value, control VCC capacitor discharge descended VCC, and when VCC dropped to the under-voltage level of IC, IC turn-offed pwm signal output; When said direct current signal was lower than second current setting value, control VCC electric capacity stopped discharge; VCC is through the VCC capacity earth; Said first current setting value is greater than second current setting value.
2. inverse-excitation type switch power-supply output short circuit protection circuit according to claim 1 is characterized in that, said signal shaping module comprises the tenth resistance and the 24 electric capacity;
The anode of said VCC power supply winding connects first end of the 24 electric capacity, the negativing ending grounding of VCC power supply winding, the second end ground connection of the 24 electric capacity through the tenth resistance.
3. inverse-excitation type switch power-supply output short circuit protection circuit according to claim 2 is characterized in that, said signal rectification filtration module comprises: the 16 diode and the 25 electric capacity;
The anode of said the 16 diode connects first end of said the 24 electric capacity, and the negative electrode of said the 16 diode connects first end of said the 25 electric capacity, the second end ground connection of said the 25 electric capacity.
4. inverse-excitation type switch power-supply output short circuit protection circuit according to claim 3; It is characterized in that said signal controlling module comprises: the 21 resistance, the 25 resistance, the 27 resistance, second switch pipe, the 3rd switching tube, the 28 resistance, the 26 electric capacity;
Be connected in parallel on the two ends of said the 25 electric capacity after said the 21 resistance and the series connection of the 25 resistance;
The control end of said second switch pipe connects the common port of the 21 resistance and the 25 resistance;
The first end ground connection of said second switch pipe, second end connects VCC end through the 27 resistance; Said VCC end connects VCC through the 18 diode; The one VCC end is through the 7th capacity earth;
Said the 3rd control end of switching tube connects second end of second switch pipe, the first end ground connection of the 3rd switching tube, and second end connects VCC;
The 3rd control end of switching tube is through the 26 capacity earth, simultaneously through the 28 grounding through resistance.
5. inverse-excitation type switch power-supply output short circuit protection circuit according to claim 4 is characterized in that, said second switch pipe and the 3rd switching tube are the NMOS pipe;
First end of said second switch pipe and the 3rd switching tube is a source electrode, and second end is drain electrode.
6. inverse-excitation type switch power-supply output short circuit protection circuit according to claim 4 is characterized in that the capacity of said the 25 electric capacity is less than the capacity of said the 7th electric capacity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011204407860U CN202309527U (en) | 2011-11-09 | 2011-11-09 | Flyback switching power supply output short-circuit protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011204407860U CN202309527U (en) | 2011-11-09 | 2011-11-09 | Flyback switching power supply output short-circuit protection circuit |
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| CN202309527U true CN202309527U (en) | 2012-07-04 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104345857A (en) * | 2013-08-01 | 2015-02-11 | 鸿富锦精密电子(天津)有限公司 | Short-circuit protection circuit |
| CN105655983A (en) * | 2016-03-23 | 2016-06-08 | 深圳南云微电子有限公司 | Protecting method and circuit of output short circuit |
| CN110912409A (en) * | 2019-11-07 | 2020-03-24 | 广州金升阳科技有限公司 | Forward and reverse excitation type switching power supply circuit |
| WO2021128716A1 (en) * | 2019-12-26 | 2021-07-01 | 上海派能能源科技股份有限公司 | Multiplexed output short-circuit protection circuit |
| CN115764811A (en) * | 2022-11-14 | 2023-03-07 | 长城电源技术(深圳)有限公司 | Short-circuit protection circuit and switching power supply with same |
| CN116488476A (en) * | 2023-06-25 | 2023-07-25 | 深圳市力生美半导体股份有限公司 | Flyback switching power supply for realizing power supply protection based on secondary side feedback |
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2011
- 2011-11-09 CN CN2011204407860U patent/CN202309527U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104345857A (en) * | 2013-08-01 | 2015-02-11 | 鸿富锦精密电子(天津)有限公司 | Short-circuit protection circuit |
| CN104345857B (en) * | 2013-08-01 | 2018-03-06 | 鸿富锦精密电子(天津)有限公司 | Short-circuit protection circuit |
| CN105655983A (en) * | 2016-03-23 | 2016-06-08 | 深圳南云微电子有限公司 | Protecting method and circuit of output short circuit |
| CN105655983B (en) * | 2016-03-23 | 2019-01-15 | 深圳南云微电子有限公司 | The guard method of output short-circuit and protection circuit |
| CN110912409A (en) * | 2019-11-07 | 2020-03-24 | 广州金升阳科技有限公司 | Forward and reverse excitation type switching power supply circuit |
| CN110912409B (en) * | 2019-11-07 | 2020-12-18 | 广州金升阳科技有限公司 | Forward and reverse excitation type switching power supply circuit |
| WO2021128716A1 (en) * | 2019-12-26 | 2021-07-01 | 上海派能能源科技股份有限公司 | Multiplexed output short-circuit protection circuit |
| CN115764811A (en) * | 2022-11-14 | 2023-03-07 | 长城电源技术(深圳)有限公司 | Short-circuit protection circuit and switching power supply with same |
| CN115764811B (en) * | 2022-11-14 | 2024-03-29 | 长城电源技术(深圳)有限公司 | Short-circuit protection circuit and switching power supply with same |
| CN116488476A (en) * | 2023-06-25 | 2023-07-25 | 深圳市力生美半导体股份有限公司 | Flyback switching power supply for realizing power supply protection based on secondary side feedback |
| CN116488476B (en) * | 2023-06-25 | 2024-01-23 | 深圳市力生美半导体股份有限公司 | Flyback switching power supply for realizing power supply protection based on secondary side feedback |
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