CN205811508U - A kind of output overcurrent protection circuit - Google Patents
A kind of output overcurrent protection circuit Download PDFInfo
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- CN205811508U CN205811508U CN201620796506.2U CN201620796506U CN205811508U CN 205811508 U CN205811508 U CN 205811508U CN 201620796506 U CN201620796506 U CN 201620796506U CN 205811508 U CN205811508 U CN 205811508U
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Abstract
This utility model provides one output overcurrent protection circuit; it is characterized in that: a kind of output overcurrent protection circuit, it is characterised in that: include the output current sampling circuit being sequentially connected with, signal amplification circuit; threshold value comparison circuit, signal isolation transfer circuit, main control chip；The isolation transfer circuit output of described signal connects the control end of main control chip；The input of output current sampling circuit is serially connected in the electric current output loop of main circuit.Compared with prior art, this utility model solve that small area analysis protection feature is poor, protect in the case of different operating frequency threshold value not precisely, poor anti jamming capability, protection postpone the problems such as long not in time.This utility model has simple and reliable for structure, low price, and protection threshold value is accurate, and capacity of resisting disturbance is strong, and protection response in time, and can guarantee that under different current protection threshold values, protection feature is consistent, and failure probability is extremely low, beneficially the volume production of product.
Description
Technical field
This utility model relates to a kind of output overcurrent protection circuit.
Background technology
In charging pile industry, the switch power module of its core component, followed by the development of quasiconductor and material technology
And develop, power density is achieved that double in recent years, and switching frequency is more and more higher, flows crossing in Switching Power Supply
Protection also requires that increasingly faster, especially at transcient short circuit time, almost requires that module can realize protection in half switch periods, and
The now conventional protection circuit utilizing current transformer or optocoupler is extremely difficult to the requirement of current power supply overcurrent protection, makes electricity consumption
When current transformer is as insulation blocking, can preferably reach the requirement of protection when electric current is relatively big and interference is less, but when being protected
Protect to image current the least when, transformer secondary is difficult to react former limit real current waveform, especially in this change of similar LLC
Frequently during PWM controls topological structure, under different working conditions, the threshold value of protection is the most different, and is very easy to by switch electricity
The interference in source, thus cause misoperation, add the difficulty of design, so protected object is even inefficacy or the feelings of misoperation
Condition, brings worse impact to switch power module reliability；The another kind of resistance sampling that uses, recycling isolation optocoupler as every
From the protection circuit of device, owing to sampling resistor concatenates in the loop, current waveform can well be restored, the threshold value of protection
The most accurate, but the use of optocoupler makes the reaction of whole protection act have bigger delay, even if using expensive high-speed light
Coupling, it is also inevitable for postponing, thus causes high frequency switch power overcurrent protection to lose efficacy and caused module damage.This practicality is new
Type has continued the advantage of above-mentioned protection circuit, solves the deficiency of above-mentioned protection circuit, under the most various size of current, various frequency
The most undelayed protective effect can be reached, and possess excellent capacity of resisting disturbance.
Summary of the invention
For the existing current foldback circuit of solution in the overcurrent protection of current high frequency switch power, it is commonly present protection threshold value not
Standard, shielding failure, the problem such as easily it is disturbed, this utility model provides one output overcurrent protection circuit.
This utility model realizes by the following technical solutions: a kind of output overcurrent protection circuit, it is characterised in that: bag
Include the output current sampling circuit being sequentially connected with, signal amplification circuit, threshold value comparison circuit, signal isolation transfer circuit, master control
Chip；The isolation transfer circuit output of described signal connects the control end of main control chip；The input concatenation of output current sampling circuit
In the electric current output loop of main circuit.
In this utility model one embodiment, described output current sampling circuit includes the first resistance, the first electric capacity, described
First resistance one terminates the current output terminal of main circuit, and another terminates first electric capacity one end；Another termination main circuit of first electric capacity
Current output terminal；First electric capacity two ends are parallel to signal amplification circuit.
It is also preferred that the left described first resistance is a precision resistance.
In this utility model one embodiment, described signal amplification circuit include the first amplifier, the second to the 6th resistance,
Second electric capacity, the 3rd electric capacity；Described second resistance one termination output current sampling circuit one end；Another termination of described second resistance
Described first amplifier negative input；The described 3rd resistance one termination output current sampling circuit other end；Described 3rd resistance is another
One end connects the 3rd electric capacity one end, the 5th resistance one end, the first amplifier positive input respectively；Another termination the 5th resistance of 3rd electric capacity
The other end；4th resistance one terminates described first amplifier negative input, the described first amplifier output of another termination；Second electric capacity
It is parallel to described 4th resistance two ends；6th resistance one terminates the first amplifier output；Another terminates threshold ratio relatively circuit；Wherein
Second resistance and the 3rd resistance are equal, and the 4th resistance and the 5th resistance are equal, the second electric capacity and the 3rd capacitor's capacity
Equal.
In this utility model one embodiment, described threshold value comparison circuit include the 7th to the 11st resistance, the 4th to
Six electric capacity, the second comparator and the first diode；7th resistance one terminates the output of described signal amplification circuit, and the other end connects respectively
5th electric capacity one end, the second comparator negative input；8th resistance one terminates reference voltage, the other end and connects the 4th electric capacity one respectively
End, the 9th resistance one end, the second comparator positive input；Tenth resistance one terminates the 9th resistance one end；Another termination of tenth resistance
First diode anode；First diode cathode connects described second comparator output；11st resistance one terminates the second comparator
Output, another terminates high level；6th electric capacity one terminates the first diode cathode；The 6th electric capacity other end and the 4th electric capacity another
Another termination of end, the 9th resistance is together.
In this utility model one embodiment, signal isolation transfer circuit include the second diode to the 4th diode, the
Seven electric capacity, the 8th electric capacity, the 12nd resistance, the 13rd resistance, the 7th electric capacity, the 8th electric capacity and transformator；7th electric capacity one end
Connect the 4th diode cathode, the output of described threshold value comparison circuit respectively；Another termination the 4th diode anode of 7th electric capacity；Tenth
Three resistance one end connect the 4th diode cathode, the second diode anode respectively；Second diode cathode connects the 12nd resistance respectively
One end, high level；Another termination the 12nd resistance other end of 13rd resistance；12nd resistor coupled in parallel is in primary two
End；Transformer secondary output one terminates the 3rd diode anode；Transformer secondary output other end ground connection；3rd diode cathode connects the 8th electricity
Hold one end；8th electric capacity other end ground connection.
In this utility model one embodiment, described main control chip is made up of LLC special chip or digital control chip.
Compared with prior art, this utility model solves that small area analysis protection feature is poor, protects in the case of different operating frequency
Protect threshold value not precisely, poor anti jamming capability, protection postpone the problems such as long not in time.This utility model has simple and reliable for structure,
Low price, protection threshold value is accurate, and capacity of resisting disturbance is strong, and protection response in time, and can guarantee that under different current protection threshold values
Protection feature is consistent, and failure probability is extremely low, beneficially the volume production of product.
1, this utility model uses current sampling circuit in prime, can collect loop current waveform exactly, and add
Low pass filter makes this current sampling circuit capacity of resisting disturbance to be greatly enhanced,
2, in the signal isolation transfer circuit of rear class, employ transformer isolation, solve optocoupler delay issue；
3, this utility model combines the advantage of both the above circuit, exactly response circuit current waveform, precisely realizes
Overcurrent protection threshold point, solves that small area analysis protection feature is poor, protects threshold value the most accurate, anti-interference in the case of different operating frequency
Ability, protection not in time, postpone the problems such as long,
4, circuit structure of the present utility model is simple, Material Cost is low, concordance is good, beneficially the volume production of product.
Accompanying drawing explanation
Fig. 1 is the theory diagram of this utility model one embodiment.
Fig. 2 is the current sampling circuit schematic diagram of this utility model one embodiment.
Fig. 3 is the signal amplification circuit schematic diagram of this utility model one embodiment.
Fig. 4 is the threshold ratio relatively circuit theory diagrams of this utility model one embodiment.
Fig. 5 is the signal isolation transfer circuit schematic diagram of this utility model one embodiment.
Detailed description of the invention
With specific embodiment, this utility model is further explained explanation below in conjunction with the accompanying drawings.
This utility model realizes by the following technical solutions: a kind of output overcurrent protection circuit, it is characterised in that: bag
Include the output current sampling circuit being sequentially connected with, signal amplification circuit, threshold value comparison circuit, signal isolation transfer circuit, master control
Chip；The isolation transfer circuit output of described signal connects the control end of main control chip；The input concatenation of output current sampling circuit
In the electric current output loop of main circuit.Cardinal principle block diagram sees Fig. 1.Wherein main circuit is a DC/DC circuit.
In this utility model one embodiment, described output current sampling circuit includes the first resistance, the first electric capacity, described
First resistance one terminates the current output terminal of main circuit, and another terminates first electric capacity one end；Another termination main circuit of first electric capacity
Current output terminal；First electric capacity two terminates signal amplification circuit.
It is also preferred that the left described first resistance is a precision resistance.
The current sampling circuit schematic diagram of this utility model one embodiment sees Fig. 2.Current sampling circuit as in figure 2 it is shown,
It is made up of sampling resistor R1 and filter capacitor C1, the output electric current that input Iout is DC/DC circuit of current sampling circuit, uses
Precision resistance sample rate current size, concrete resistance need to be in conjunction with by protective loop size of current, comprehensive by protection circuit current precision
Choose, for ensureing that sampling resistor power selection is according to sampling during loop current maximum during normal work by protection circuit reliability
2 times of resistor power select, and use 47pF electric capacity to doing small Filtering Processing herein, filter resistance coupling at sample rate current
The interference signal come over, adds strong anti-interference ability, and sampling resistor two ends use isometric line to introduce current amplification circuit input port,
Sampling herein and be output as a voltage signal, voltage swing is。
In this utility model one embodiment, described signal amplification circuit include the first amplifier, the second to the 6th resistance,
Second electric capacity, the 3rd electric capacity；Described second resistance one termination output current sampling circuit one end；Another termination of described second resistance
Described first amplifier negative input；The described 3rd resistance one termination output current sampling circuit other end；Described 3rd resistance is another
One end connects the 3rd electric capacity one end, the 5th resistance one end, the first amplifier positive input respectively；Another termination the 5th resistance of 3rd electric capacity
The other end；4th resistance one terminates described first amplifier negative input, the described first amplifier output of another termination；Second electric capacity
It is parallel to described 4th resistance two ends；6th resistance one terminates the first amplifier output；Another terminates threshold ratio relatively circuit；Wherein
Second resistance and the 3rd resistance are equal, and the 4th resistance and the 5th resistance are equal, the second electric capacity and the 3rd capacitor's capacity
Equal.
This utility model one implement current amplification circuit be illustrated in fig. 3 shown below, by operational amplifier IC1, resistance R2-R6,
Electric capacity C2, C3 form, and wherein R2=R3, R4=R5, C2=C3 mainly has two to act on greatly, and first is the amplification of current signal,
The faint voltage signal that current sampling circuit sampling comes is amplified certain multiple, it is ensured that size of current threshold value can be adjusted flexibly
Whole and control, due to R2=R3, R4=R5 in figure, therefore amplification, can calculate, the second conduct
Jamproof Main Means, current amplification circuit is made low-pass filter circuit, can be prevented effectively from the height from Switching Power Supply itself
Frequency interference, and ensure that protective current the most lossless be amplified to late-class circuit, filter bandwidht can according to protection demand knot
Combination switch supply frequency is chosen, cut-off frequency can be calculated into, choose suitable electricity according to demand
Resistance and electric capacity, can effectively ensure that the protection precision of threshold value, concordance and the capacity of resisting disturbance of protection circuit, and R6 is serially connected in signal and returns
Lu Zhong, main considers that this output is longer with the spacing of subordinate input, can play necessarily filter, jamproof effect, while with
Subordinate's circuit collectively constitutes and reaches RC and filter effect.
In this utility model one embodiment, described threshold value comparison circuit include the 7th to the 11st resistance, the 4th to
Six electric capacity, the second comparator and the first diode；7th resistance one terminates the output of described signal amplification circuit, and the other end connects respectively
5th electric capacity one end, the second comparator negative input；8th resistance one terminates reference voltage, the other end and connects the 4th electric capacity one respectively
End, the 9th resistance one end, the second comparator positive input；Tenth resistance one terminates the 9th resistance one end；Another termination of tenth resistance
First diode anode；First diode cathode connects described second comparator output；11st resistance one terminates the second comparator
Output, another terminates high level；6th electric capacity one terminates the first diode cathode；The 6th electric capacity other end and the 4th electric capacity another
Another termination of end, the 9th resistance is together.
Threshold value comparison circuit as shown in Figure 4, is made up of comparator IC2, resistance R7-R11, electric capacity C4-C6, diode D1,
R7 is serially connected in signal circuit, constitutes RC filter circuit with higher level circuit R6 and C5 herein, filters owing to circuit coupling comes
High-frequency interferencing signal, the available precision voltage reference of R8, R9 and C4 combination, R8, R9 require to combine according to protective current
Sampling resistor size and current amplification circuit amplification are done and are adjusted setting accurately, can configuration protection point the most flexibly,
Reach the accuracy purpose of overcurrent protection threshold point, and add the circuit with Schmidt's characteristic, i.e. in Fig. 4, R10 and D1 is risen
Effect, when working properly, current threshold point not yet reaches protection act point, and IC2 the 3rd foot is output as height, D1 be inverted cut
Only, R10 is inoperative to dividing potential drop, and IC2 the 2nd foot voltage is,For predetermined reference voltage, when electric current is put
When big circuit output reaches IC2 the 2nd foot voltage U, IC2 the 3rd foot is output as low, concatenates R8 group again with R9 parallel connection after R10 concatenation D1
Becoming potential-divider network, owing to R10 is connected in parallel on R9, therefore IC2 the 2nd foot voltage is necessarily less than dividing potential drop before so that circuit serves to be executed
The effect of close special characteristic, adds protection reliability and the precision of protection circuit, the most also has short-circuit signal and keeps feature, protects
Demonstrate,prove the operating time of protection that rear class protection circuit is enough, considerably increase late-class circuit accuracy of action, it is ensured that whole
The reliability of circuit protection.
In this utility model one embodiment, signal isolation transfer circuit include the second diode to the 4th diode, the
Seven electric capacity, the 8th electric capacity, the 12nd resistance, the 13rd resistance, the 7th electric capacity, the 8th electric capacity and transformator；7th electric capacity one end
Connect the 4th diode cathode, the output of described threshold value comparison circuit respectively；Another termination the 4th diode anode of 7th electric capacity；Tenth
Three resistance one end connect the 4th diode cathode, the second diode anode respectively；Second diode cathode connects the 12nd resistance respectively
One end, high level；Another termination the 12nd resistance other end of 13rd resistance；12nd resistor coupled in parallel is in primary two
End；Transformer secondary output one terminates the 3rd diode anode；Transformer secondary output other end ground connection；3rd diode cathode connects the 8th electricity
Hold one end；8th electric capacity other end ground connection.
Signal isolation transfer circuit such as Fig. 5, circuit is made up of D2, D3, R12, R13, C7, C8 and T1, and C7 primarily serves the purpose of
Bypassing circuit and couple the high-frequency signal come, D2 is clamp diode string, protects threshold value comparison circuit, and R13 is current-limiting resistance,
The exciting current that the former limit of limiting transformer is maximum, protection transformator and prime chip U2, R12 are multiple as the magnetic after transformer action
Position discharge resistance uses, and owing to the work of this transformator is only crossing the just action of stream moment once, therefore uses R12 as magnetic reset electricity
Road, it is ensured that magnetic material can completely reset and occur without saturated situation, and there is the advantage of simple in construction low cost, transformator
T1 is mainly the effect of former secondary electrical isolation, uses the effect of electromagnetic coupled, when there is signalizing activity on former limit, and can transient response
To secondary, reaching the undelayed effect of action, be i.e. used herein as the function that transformator T1 realizes, it is pressure that transformator meets former secondary
And the requirement of creep age distance, calculating the former secondary turn ratio according to the size of former limit supply voltage, D3 is diode, is protected by secondary
Signal, through halfwave rectifier, obtains a forward voltage signal, is delivered to the triggering foot of rear class main control chip, and C8 is the work of filtering
With, owing to prime has transformator and diode, easily produce peak voltage, therefore use C8 to filter out high frequency pulsewidth spike, strengthen
The capacity of resisting disturbance of protection circuit.
In this utility model one embodiment, described main control chip is made up of LLC special chip or digital control chip.
Main control chip is made up of special LLC chip or digital control chip, has a triggering pin to be used as in special chip
Overcurrent protection use, introduces signal isolation circuit outfan this and controls foot, can instantaneous closedown PWM, it is achieved instant protection power electricity
Road, it is achieved defencive function, if control chip is digital control chip, then introduces digital control chip by isolation circuit output end
Triggering foot, flip chip stop PWM output, reach protection purpose.
In existing isolated form current foldback circuit, isolate the sample circuit of double size of current making Current Transformer carry out
In, the primary current wave distortion that current transformer secondary induces, big small magnitude and precision thereof are poor, by loop current frequency
Impact is very big, and protection threshold point is not fixed, and external interference resistance is poor, there is shielding failure and the phenomenon of protection by mistake, product
Concordance is poor, and the another kind of overcurrent protection mode using resistance sampling then solves such as current waveform distortion, big small magnitude
And the shortcoming such as precision is poor, and adding low-pass filter circuit, capacity of resisting disturbance gets a promotion, but owing to employing optocoupler
As isolating device so that the fixing delay that optocoupler is brought is also inevitable, if using high speed photo coupling, postpone the most only to be only capable of
Being shortened and expensive, the intrinsic delay feature of optocoupler is inevitable.This utility model then combines two kinds of protection circuits
Advantage, use resistance sampling, can perfectly collect loop current waveform, and add low pass filter and make this sampling electricity
Road capacity of resisting disturbance is greatly enhanced, and employs transformer isolation, solve optocoupler delay issue in rear class isolation circuit,
The advantage combining two kinds of current foldback circuits, perfect response circuit current waveform, realize overcurrent protection threshold point accurately,
Solve that small area analysis protection feature is poor, protect in the case of different operating frequency threshold value not precisely, poor anti jamming capability, protection too late
Time, postpone the problems such as long, and this current foldback circuit simple in construction, Material Cost is low, concordance good, the beneficially volume production of product,
Function, performance and economic benefit that this utility model is brought are obvious.Protection domain: output current sampling circuit, signal amplify
The method that circuit, threshold value comparison circuit and signal isolation protection circuit combined by transfer circuit realize.
Above-described embodiment is the most for illustration of the utility model, those skilled in the art, without departing from this
In the case of the spirit and scope of utility model, it is also possible to make various conversion or change, therefore, the technical scheme of all equivalents
Also category of the present utility model should be belonged to.
Claims (7)
1. an output overcurrent protection circuit, it is characterised in that: include the output current sampling circuit being sequentially connected with, signal
Amplifying circuit, threshold value comparison circuit, signal isolation transfer circuit, main control chip；The isolation transfer circuit output of described signal meets master
The control end of control chip；The input of output current sampling circuit is serially connected in the electric current output loop of main circuit.
Output overcurrent protection circuit the most according to claim 1, it is characterised in that: described output current sampling circuit
Including the first resistance, the first electric capacity, described first resistance one terminates the current output terminal of main circuit, and another terminates the first electric capacity one
End；The current output terminal of another termination main circuit of the first electric capacity；First electric capacity two ends are parallel to signal amplification circuit.
Output overcurrent protection circuit the most according to claim 2, it is characterised in that: described first resistance is a precision
Resistance.
Output overcurrent protection circuit the most according to claim 1, it is characterised in that: described signal amplification circuit includes
First amplifier, the second to the 6th resistance, the second electric capacity, the 3rd electric capacity；Described second resistance one termination output current sample electricity
One end, road；Another described first amplifier negative input of termination of described second resistance；Described 3rd resistance one termination output electric current is adopted
The sample circuit other end；It is the most defeated that the described 3rd resistance other end connects the 3rd electric capacity one end, the 5th resistance one end, the first amplifier respectively
Enter；Another termination the 5th resistance other end of 3rd electric capacity；4th resistance one terminates described first amplifier negative input, another termination
Described first amplifier output；Second electric capacity is parallel to described 4th resistance two ends；It is defeated that 6th resistance one terminates the first amplifier
Go out；Another terminates threshold ratio relatively circuit；Wherein the second resistance and the 3rd resistance are equal, the 4th resistance and the 5th resistance
Equal, the second electric capacity and the 3rd capacitor's capacity are equal.
Output overcurrent protection circuit the most according to claim 1, it is characterised in that: described threshold value comparison circuit includes
7th to the 11st resistance, the 4th to the 6th electric capacity, the second comparator and the first diode；7th resistance one terminates described signal
Amplifying circuit exports, and the other end connects the 5th electric capacity one end, the second comparator negative input respectively；8th resistance one termination is with reference to electricity
Pressure, the other end connect the 4th electric capacity one end, the 9th resistance one end, the second comparator positive input respectively；Tenth resistance one terminates the 9th
Resistance one end；Tenth resistance another terminate the first diode anode；First diode cathode connects described second comparator output；The
11 resistance one terminate the second comparator output, and another terminates high level；6th electric capacity one terminates the first diode cathode；6th
The electric capacity other end is together with the 4th electric capacity other end, another termination of the 9th resistance.
Output overcurrent protection circuit the most according to claim 1, it is characterised in that: signal isolation transfer circuit includes
Second diode to the 4th diode, the 7th electric capacity, the 8th electric capacity, the 12nd resistance, the 13rd resistance, the 7th electric capacity, the 8th
Electric capacity and transformator；7th electric capacity one end connects the 4th diode cathode, the output of described threshold value comparison circuit respectively；7th electric capacity is another
One termination the 4th diode anode；13rd resistance one end connects the 4th diode cathode, the second diode anode respectively；Two or two
Pole tube cathode connects the 12nd resistance one end, high level respectively；Another termination the 12nd resistance other end of 13rd resistance；Tenth
Two resistor coupled in parallel are in primary two ends；Transformer secondary output one terminates the 3rd diode anode；Another termination of transformer secondary output
Ground；3rd diode cathode connects the 8th electric capacity one end；8th electric capacity other end ground connection.
Output overcurrent protection circuit the most according to claim 1, it is characterised in that: described main control chip is special by LLC
Form with chip or digital control chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620796506.2U CN205811508U (en) | 2016-07-27 | 2016-07-27 | A kind of output overcurrent protection circuit |
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| CN201620796506.2U CN205811508U (en) | 2016-07-27 | 2016-07-27 | A kind of output overcurrent protection circuit |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107565509A (en) * | 2017-10-11 | 2018-01-09 | 安徽衡孚电子科技有限公司 | A kind of delay overcurrent turn-off function circuit for elevator switch power supply |
| CN107650730A (en) * | 2017-10-30 | 2018-02-02 | 科大智能（合肥）科技有限公司 | A kind of direct-current charging post multiple gun power distribution system |
| CN108306254A (en) * | 2018-04-09 | 2018-07-20 | 广州金升阳科技有限公司 | A kind of isolation protective circuit and the Switching Power Supply comprising the circuit |
| CN108454429A (en) * | 2018-02-07 | 2018-08-28 | 苏州共元自控技术有限公司 | A kind of electric vehicle direct-current charging post safety monitoring device and method |
| CN110474304A (en) * | 2019-07-23 | 2019-11-19 | 上海空间电源研究所 | A kind of Magnetic isolation formula high voltage bus high-speed response current foldback circuit |
| CN110542774A (en) * | 2019-09-11 | 2019-12-06 | 深圳市航天新源科技有限公司 | Feedback type bidirectional current magnetic isolation sampling circuit |
| CN111327020A (en) * | 2020-03-10 | 2020-06-23 | 珠海格力电器股份有限公司 | Power supply protection circuit and power supply |
| CN114019415A (en) * | 2022-01-06 | 2022-02-08 | 宜矽源半导体南京有限公司 | Integrated short-circuit current detector with variable threshold, self-calibration and high precision |
| CN117439606A (en) * | 2023-12-15 | 2024-01-23 | 珠海格力电器股份有限公司 | AD isolation sampling circuit for power carrier communication and multi-split air conditioning system |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107565509A (en) * | 2017-10-11 | 2018-01-09 | 安徽衡孚电子科技有限公司 | A kind of delay overcurrent turn-off function circuit for elevator switch power supply |
| CN107650730A (en) * | 2017-10-30 | 2018-02-02 | 科大智能（合肥）科技有限公司 | A kind of direct-current charging post multiple gun power distribution system |
| CN108454429A (en) * | 2018-02-07 | 2018-08-28 | 苏州共元自控技术有限公司 | A kind of electric vehicle direct-current charging post safety monitoring device and method |
| CN108454429B (en) * | 2018-02-07 | 2023-12-26 | 苏州共元自控技术有限公司 | Safety monitoring device and method for direct-current charging pile of electric automobile |
| CN108306254A (en) * | 2018-04-09 | 2018-07-20 | 广州金升阳科技有限公司 | A kind of isolation protective circuit and the Switching Power Supply comprising the circuit |
| CN110474304A (en) * | 2019-07-23 | 2019-11-19 | 上海空间电源研究所 | A kind of Magnetic isolation formula high voltage bus high-speed response current foldback circuit |
| CN110474304B (en) * | 2019-07-23 | 2021-09-07 | 上海空间电源研究所 | Magnetic isolation type high-speed response overcurrent protection circuit for high-voltage bus |
| CN110542774A (en) * | 2019-09-11 | 2019-12-06 | 深圳市航天新源科技有限公司 | Feedback type bidirectional current magnetic isolation sampling circuit |
| CN111327020A (en) * | 2020-03-10 | 2020-06-23 | 珠海格力电器股份有限公司 | Power supply protection circuit and power supply |
| CN114019415A (en) * | 2022-01-06 | 2022-02-08 | 宜矽源半导体南京有限公司 | Integrated short-circuit current detector with variable threshold, self-calibration and high precision |
| CN117439606A (en) * | 2023-12-15 | 2024-01-23 | 珠海格力电器股份有限公司 | AD isolation sampling circuit for power carrier communication and multi-split air conditioning system |
| CN117439606B (en) * | 2023-12-15 | 2024-04-02 | 珠海格力电器股份有限公司 | AD isolation sampling circuit for power carrier communication and multi-split air conditioning system |
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