CN110416974A - A kind of protective circuit of switch power source, Switching Power Supply and Switching Power Supply guard method - Google Patents
A kind of protective circuit of switch power source, Switching Power Supply and Switching Power Supply guard method Download PDFInfo
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- CN110416974A CN110416974A CN201910755104.6A CN201910755104A CN110416974A CN 110416974 A CN110416974 A CN 110416974A CN 201910755104 A CN201910755104 A CN 201910755104A CN 110416974 A CN110416974 A CN 110416974A
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- power supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1203—Circuits independent of the type of conversion
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Protection Of Static Devices (AREA)
Abstract
Protective circuit of switch power source provided by the invention, Switching Power Supply and Switching Power Supply guard method, applied to power supply technique field, the protective circuit of switch power source includes detection circuit and protection circuit, the input terminal of detection circuit is connected with the output end of Switching Power Supply, for exporting fault-signal when detecting that Switching Power Supply is in wave limiting protected mode, the input terminal of protection circuit is connected with the output end of detection circuit, the output end of protection circuit is connected with the control circuit of Switching Power Supply, for after receiving fault-signal, default control signal is exported to control circuit, so that the power conversion circuit of control circuit control switch power supply is closed.Protective circuit of switch power source provided by the invention; after Switching Power Supply enters wave limiting protected mode; the shutdown of control switch power supply; stop output power; it avoids switched power output institute wiring cable from being chronically at the working condition of low pressure constant current, and then avoids since cable temperature is higher and bring security risk.
Description
Technical field
The present invention relates to power supply technique field, in particular to a kind of protective circuit of switch power source, Switching Power Supply and switch electricity
Source protection method.
Background technique
Switching Power Supply by its high efficiency, high reliability, it is small in size the advantages that be widely used in industrial circle, when switch electricity
It when short circuit occurs for source outlet side, needs to trigger preset protection mechanism, closes power output to protect successive load.
Wave limiting is one of common protected mode of Switching Power Supply, by limitation pwm signal duty ratio come limit switch
The output voltage of power supply, and then power output is reduced, achieve the purpose that protect successive load.
For starting the Switching Power Supply of wave limiting protected mode, although output can be reduced by reducing output voltage
Power, but Switching Power Supply can be chronically at the working condition of low pressure constant current, cable is through-flow for a long time, and it is higher to will lead to cable temperature,
There are certain security risks.
Summary of the invention
The present invention provides a kind of protective circuit of switch power source, Switching Power Supply and Switching Power Supply guard method, existing to solve
The Switching Power Supply for starting wave limiting protected mode in technology is chronically at the working condition of low pressure constant current, cause cable temperature compared with
There is security risk in height.
To achieve the above object, technical solution provided by the present application is as follows:
In a first aspect, the present invention provides a kind of protective circuit of switch power source, comprising: detection circuit and protection circuit, wherein
The input terminal of the detection circuit is connected with the output end of Switching Power Supply, for detecting at the Switching Power Supply
Fault-signal is exported when wave limiting protected mode；
It is described protection circuit input terminal be connected with the output end of the detection circuit, it is described protect circuit output end and
The control circuit of the Switching Power Supply is connected, for after receiving the fault-signal, the output of Xiang Suoshu control circuit to be default
Signal is controlled, so that the power conversion circuit that the control circuit controls the Switching Power Supply is closed.
Optionally, the detection circuit includes that voltage detecting circuit, current detection circuit and fault-signal generate electricity
Road, wherein
The input terminal of the input terminal of the voltage detecting circuit and the current detection circuit is as the detection circuit
Input terminal is connected with the output end of the Switching Power Supply respectively；
The output end of the voltage detecting circuit is connected with the first input end of the defect signal generating circuit, the electricity
The output end of current detection circuit is connected with the second input terminal of the defect signal generating circuit；
Output end of the output end of the defect signal generating circuit as the detection circuit, with the protection circuit
Input terminal is connected；
The voltage detecting circuit is used to detect the output voltage of the Switching Power Supply, presets when the output voltage is less than
When voltage threshold, output predeterminated voltage detects signal；
The current detection circuit is used to detect the output electric current of the Switching Power Supply, presets when the output electric current is greater than
When current threshold, output predetermined current detects signal；
The defect signal generating circuit is used for while receiving the predeterminated voltage detection signal and the predetermined current
When detecting signal, the fault-signal is exported.
Optionally, the voltage detecting circuit includes in isolated form voltage detecting circuit and non-isolation type voltage detecting circuit
One kind.
Optionally, the current detection circuit includes in isolated form current detection circuit and non-isolation type current detection circuit
One kind.
Optionally, the isolated form voltage detecting circuit includes: voltage sensor and first comparator, wherein
Input terminal of the input terminal of the voltage sensor as the voltage detecting circuit, it is defeated with the Switching Power Supply
Outlet is connected, for measuring the output voltage of the Switching Power Supply；
The cathode of the first comparator is connected with the output end of the voltage sensor, and anode accesses the predeterminated voltage
Threshold value, output end and the defect signal generating circuit of the output end of the first comparator as the voltage detecting circuit
First input end be connected.
Optionally, the non-isolation type voltage detecting circuit includes: first resistor, second resistance and the second comparator,
In,
The first end of the first resistor is as the input terminal of the voltage detecting circuit and the output of the Switching Power Supply
End is connected, and the second end of the first resistor is grounded through the second resistance；
The cathode of second comparator is connected with the second end of the first resistor, and anode accesses the predeterminated voltage threshold
Value, output end and the defect signal generating circuit of the output end of second comparator as the voltage detecting circuit
First input end is connected.
Optionally, the isolated form current detection circuit includes: current sensor, the first reverse phase scaling circuit and
Three comparators, wherein
Input terminal of the current sensor as the current detection circuit, is set to the output of the Switching Power Supply
End；
The first input end of the first reverse phase scaling circuit is connected with the output end of the current sensor, and second
Input terminal is connected with the output end of the Switching Power Supply positioned at the current sensor downstream；
The anode of the third comparator is connected with the output end of the first reverse phase scaling circuit, and cathode accesses institute
Predetermined current threshold is stated, the output end of the third comparator is believed as the output end of the current detection circuit and the failure
Second input terminal of number generative circuit is connected.
Optionally, the non-isolation type current detection circuit includes: sampling resistor, the second reverse phase scaling circuit and
Four comparators, wherein
The sampling resistor is serially connected with the output end of the Switching Power Supply；
The first input end of the second reverse phase scaling circuit is connected with the current input terminal of the sampling resistor, the
Two input terminals are connected with the current output terminal of the sampling resistor；
The anode of 4th comparator is connected with the output end of the second reverse phase scaling circuit, and cathode accesses institute
Predetermined current threshold is stated, the output end of the 4th comparator is believed as the output end of the current detection circuit and the failure
Second input terminal of number generative circuit is connected.
Optionally, the defect signal generating circuit includes one of logical AND gate circuit and microcontroller.
Optionally, the protective circuit of switch power source that any one of first aspect present invention provides, the protection circuit included
At least one of stream protection circuit, short-circuit protection circuit, overvoltage crowbar, thermal-shutdown circuit.
Optionally, the protective circuit of switch power source that any one of first aspect present invention provides, the default control signal packet
It includes and closes machine control signal or enable signal, wherein
The power supply for closing machine control signal and being used to cut off the control circuit, so that the power conversion of the Switching Power Supply
Circuit is closed；
The enable signal executes power-off operation for triggering the control circuit, to close institute by the control circuit
State the power conversion circuit of Switching Power Supply.
Second aspect, the present invention provide a kind of Switching Power Supply, comprising: input filter circuit, output filter circuit, control electricity
The protective circuit of switch power source that any one of road, power conversion circuit and first aspect present invention provide, wherein
The control circuit is used for when receiving default control signal, is controlled the power conversion circuit and is closed, and
Meet it is default restart condition after, control the power conversion circuit and restart；
Input terminal of the input terminal of the input filter circuit as the Switching Power Supply, the input filter circuit it is defeated
Outlet is connected with the input terminal of the power conversion circuit；
The output end of the power conversion circuit is connected with the input terminal of the output filter circuit, the output filtered electrical
The output end on road connects load as the output end of the Switching Power Supply.
The third aspect, the present invention provide a kind of Switching Power Supply guard method, open applied to what second aspect of the present invention provided
Powered-down source, which comprises
Obtain default electric parameter；
If determining the switched power output short circuit according to the default electric parameter, the defeated of power conversion circuit is reduced
Power out；
Default control signal is obtained, and the power conversion circuit is controlled according to the default control signal and is closed, wherein
The default control signal is the protective circuit of switch power source in the Switching Power Supply, in the output for detecting the Switching Power Supply
Voltage is less than predetermined voltage threshold, and the letter exported in the case that the output electric current of the Switching Power Supply is greater than predetermined current threshold
Number；
Power on signal is obtained, the power conversion circuit is controlled according to the power on signal and is restarted, and is returned described in execution
Obtain default electric parameter step.
Protective circuit of switch power source provided by the invention, including detection circuit and protection circuit, the input terminal of detection circuit
It is connected with the output end of Switching Power Supply, for exporting failure letter when detecting that Switching Power Supply is in wave limiting protected mode
Number, it protects the input terminal of circuit to be connected with the output end of detection circuit, protects the output end of circuit and the control electricity of Switching Power Supply
Road is connected, for default control signal being exported to control circuit, so that control circuit control switch after receiving fault-signal
The power conversion circuit of power supply is closed.Protective circuit of switch power source provided by the invention enters wave limiting in Switching Power Supply and protects
After shield mode, the shutdown of control switch power supply stops output power, switched power output institute wiring cable is avoided to be chronically at low pressure
The working condition of constant current, and then avoid since cable temperature is higher and bring security risk.
Further, if Switching Power Supply after restart, outlet side short trouble still remains, Switching Power Supply can again into
Enter wave limiting protected mode, can equally trigger protection circuit provided by the invention again, so that Switching Power Supply is shut down again, it is past
Multiple circulation effectively improves the safety of Switching Power Supply operation until outlet side short trouble excludes.
Detailed description of the invention
Technical solution in order to illustrate the embodiments of the present invention more clearly or in the prior art to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, it is only this that interior attached drawing, which is described below,
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of structural block diagram of protective circuit of switch power source provided in an embodiment of the present invention；
Fig. 2 is the structural block diagram of another protective circuit of switch power source provided in an embodiment of the present invention；
Fig. 3 is a kind of circuit structure diagram of protective circuit of switch power source provided in an embodiment of the present invention；
Fig. 4 is the circuit structure diagram of another protective circuit of switch power source provided in an embodiment of the present invention；
Fig. 5 is the circuit structure diagram of another protective circuit of switch power source provided in an embodiment of the present invention；
Fig. 6 is a kind of structural block diagram of Switching Power Supply provided in an embodiment of the present invention；
Fig. 7 is a kind of flow chart of Switching Power Supply guard method provided in an embodiment of the present invention.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.It is based on
Embodiment in the application, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall in the protection scope of this application.
It is a kind of structural block diagram of protective circuit of switch power source provided in an embodiment of the present invention referring to Fig. 1, Fig. 1.As schemed
Show, protective circuit of switch power source provided in an embodiment of the present invention includes: detection circuit 1 and protection circuit 2, wherein
The input terminal of detection circuit 1 and Switching Power Supply output end (shown in Fig. 1 with the output end of power conversion circuit 3,
Can also include other circuits in the prior art) it is connected, for detecting that Switching Power Supply is in wave limiting protected mode
When export fault-signal.
Optionally, the power conversion circuit 3 that the embodiment of the present invention is addressed obtains required output voltage by switch change-over,
It can be the topological structures such as Buck, Boost, Buck-Boost, Sepic of non-isolation type, or isolated form
The topological structures such as Flyback, Forward, Push-Pull, Half-Bridge, Full-Bridge, the embodiment of the present invention for
The specific topological structure of power conversion circuit 3 is without limitation.
The input terminal of protection circuit 2 is connected with the output end of detection circuit 1, meanwhile, protect the output end and switch of circuit 2
The control circuit 4 of power supply is connected, and protection circuit 2 is defeated to control circuit 4 after the fault-signal for receiving the sending of detection circuit 1
Default control signal out, control circuit 4 execute default control function after obtaining default control signal, control switch power supply
Power conversion circuit 3 is closed, and then realizes the closing of control switch power supply.
Optionally, protection circuit 2 can select current foldback circuit, short-circuit protection circuit, overvoltage crowbar, excess temperature to protect
One of protection circuit is a variety of, and the embodiment of the present invention is to the concrete function for protecting circuit 2 and realizes that concrete function institute is right
The circuit structure answered without limitation, can be after the fault-signal for receiving the transmission of detection circuit 1, and output default control signal is extremely
Control circuit 4, the protection circuit that trigger control circuit 4 executes aforementioned power-off operation is all optional.
Specifically, the default control signal of the output of protection circuit 2 can be pass machine control signal, alternatively, can also be
Enable signal, wherein the power supply that machine control signal is used to cut off control circuit 4 is closed, so that 4 power down of control circuit, and then force
The power conversion circuit 3 of Switching Power Supply is closed；The effect of enable signal is to trigger, and executes shutdown for trigger control circuit 4
Operation, the power conversion circuit 3 of power supply is turned off the switch by control circuit 4.
Further, the output end of control circuit 4 is also connected with power conversion circuit 3, be mainly used for by feed circuit,
Voltage loop or electric current loop are implemented the output voltage or output electric current of monitoring power conversion circuit 3, are believed according to acquired monitoring
Number, by controlling the pulsewidth or frequency of PWM modulation signal, power conversion circuit 3 is maintained to export stable voltage or electric current.
In conclusion protective circuit of switch power source provided in an embodiment of the present invention, is mainly used in and is provided with wave limiting
The Switching Power Supply of protected mode can enter wave limiting first and protect mould when short trouble occurs for the output end of Switching Power Supply
Formula, protection circuit provided in an embodiment of the present invention can export after detecting that Switching Power Supply enters wave limiting protected mode
Default control signal, control power conversion circuit are closed, and then realize the shutdown of control switch power supply, are stopped output power, are exited
Wave limiting protected mode avoids switched power output institute wiring cable from being chronically at the working condition of low pressure constant current, and then keeps away
Exempt from since cable temperature is higher and bring security risk.
Further, Switching Power Supply is both provided with greatly after fail close machine and is restarted automatically function, if Switching Power Supply is in weight
The short trouble of Qi Hou, outlet side still remain, then Switching Power Supply can be again introduced into wave limiting protected mode, correspondingly,
Protection circuit output default control signal provided in an embodiment of the present invention can be equally triggered, so that Switching Power Supply is shut down again, it is past
Multiple circulation, that is, form hiccup protections mode, until outlet side short trouble excludes, so as to effectively improve Switching Power Supply operation
Safety.
Optionally, referring to fig. 2, Fig. 2 is the structural frames of another protective circuit of switch power source provided in an embodiment of the present invention
Figure.As shown, the optional composition setting of protection circuit has been shown in particular in the embodiment of the present invention.Specifically, the present invention is real
Detection circuit 1 in the protective circuit of switch power source of example offer is provided and includes voltage detecting circuit 11, current detection circuit 12, and
Defect signal generating circuit 13.
The input terminal of the input terminal of voltage detecting circuit 11 and the input terminal of current detection circuit 12 as detection circuit 1,
It (is shown in figure with the output end of power conversion circuit 3 with the output end of Switching Power Supply respectively, can also include in the prior art
Other circuits) it is connected.The output end of voltage detecting circuit 11 is connected with the first input end of defect signal generating circuit 13, electric current
The output end of detection circuit 12 is connected with the second input terminal of defect signal generating circuit 13.Defect signal generating circuit 13 it is defeated
Output end of the outlet as detection circuit 1 is connected with the input terminal of protection circuit 2.
Optionally, voltage detecting circuit 11 can select isolated form voltage detecting circuit and non-isolation type voltage detecting circuit
One of, the voltage detecting circuit of any one type should all be able to detect the output voltage of Switching Power Supply, work as Switching Power Supply
Output voltage be less than predetermined voltage threshold when, output predeterminated voltage detect signal.For example, the output voltage when Switching Power Supply is small
When predetermined voltage threshold, high level is exported, which is predeterminated voltage detection signal.
Optionally, current detection circuit 12 includes in isolated form current detection circuit and non-isolation type current detection circuit
One kind, current detection circuit 12 are used for the output electric current of detection switch power supply, when the output electric current of Switching Power Supply is greater than default electricity
When flowing threshold value, output predetermined current detects signal.For example, it is similar with predeterminated voltage detection signal, when the output electricity of Switching Power Supply
When stream is greater than predetermined current threshold, signal is detected using the high level of output as the predetermined current.
As previously mentioned, the output with voltage detecting circuit 11 and current detection circuit 12 respectively of defect signal generating circuit 13
End is connected, what the predeterminated voltage detection signal and current detection circuit 12 for receiving the sending of voltage detecting circuit 11 at the same time issued
When predetermined current detects signal, fault-signal is exported.
Optionally, defect signal generating circuit 13 may include one of logical AND gate circuit and microcontroller.It needs
Illustrate, other implementations that the above-mentioned function of defect signal generating circuit 13 may be implemented are also optionally, to be no more than
Under the premise of core concept range of the present invention, the scope of protection of the invention is also belonged to.
The fault-signal that defect signal generating circuit 13 exports will be sent to protection circuit 2, and then trigger protection circuit 2 is defeated
Default control signal out, so that the power conversion circuit 3 of 4 control switch power supply of control circuit is closed, details are not described herein again.
Protective circuit of switch power source provided by the invention is illustrated below with reference to specific circuit structure diagram.And emphasis
It composition to detection circuit and builds several optional implementations is provided.
It optionally, is a kind of circuit structure of protective circuit of switch power source provided in an embodiment of the present invention referring to Fig. 3, Fig. 3
Figure.
As shown, voltage detecting circuit 11 selects isolated form voltage detecting circuit, 110 He of voltage sensor is specifically included
First comparator 111.
Specifically, input terminal of the input terminal of voltage sensor 110 as voltage detecting circuit 11, defeated with Switching Power Supply
Outlet is connected, for measuring the output voltage of Switching Power Supply.The output of the cathode and voltage sensor 110 of first comparator 111
End is connected, the anode access predetermined voltage threshold of first comparator 111, the voltage sensor that first comparator 111 acquires cathode
The output voltage of device 110 and the predetermined voltage threshold of anode access compare, and export corresponding comparison result.First compares
The output end of device 111 is connected as the output end of voltage detecting circuit 11 with the first input end of defect signal generating circuit 13.
Further, current detection circuit 12 equally uses isolated form current detection circuit.It specifically includes: current sensor
120, the first reverse phase scaling circuit 121 and third comparator 122, wherein
Input terminal of the current sensor 120 as current detection circuit 12 is set to the output end of Switching Power Supply, switch electricity
The output electric current in source flows through the sensor circuit of current sensor 120, the output of current sensor 120 and Switching Power Supply reality output electricity
Flow proportional induced current.
The first input end of first reverse phase scaling circuit 121 is connected with the output end of current sensor 120, and first is anti-
Second input terminal of Phase Proportion amplifying circuit 121 is connected with the output end for the Switching Power Supply for being located at 120 downstream of current sensor.
Optionally, the first reverse phase scaling circuit 121 is specifically built by comparator and corresponding resistance.Reverse phase ratio
The implementation of the prior art, specific structure of the present patent application to reverse phase scaling circuit can be used in the composition of example amplifying circuit
At without limitation.
The anode of third comparator 122 is connected with the output end of the first reverse phase scaling circuit 121, third comparator
122 cathode accesses predetermined current threshold, the predetermined current threshold that third comparator accesses the collected value of anode with cathode
It is compared, and exports corresponding comparison result.Output end of the output end of third comparator 122 as current detection circuit 12
It is connected with the second input terminal of defect signal generating circuit 13.
Based on the protection circuit that embodiment illustrated in fig. 3 provides, the action process protected to Switching Power Supply is substantially are as follows:
Switching Power Supply start completion, 3 output power of power conversion circuit, the output voltage to power conversion circuit 3 are established
Afterwards, isolation sampling is carried out by output voltage of the voltage sensor 110 to Switching Power Supply, will be exported by voltage sensor 110
The sampled value of voltage is sent into first comparator 111 and is compared judgement.Output voltage is higher than default when Switching Power Supply works normally
Voltage threshold, then first comparator 111 exports low level；Switching Power Supply outlet side short trouble protects mould into wave limiting
After formula, the output voltage of output end is reduced, and is lower than predetermined voltage threshold, at this point, first comparator 111 exports high level.Switch
The output electric current of power supply carries out isolation sampling by current sensor 120, exports sample rate current by current sensor 120, and
It is amplified by the first reverse phase scaling circuit 121 and is compared judgement with feeding third comparator 122 after reverse phase, switched
When power supply works normally, output electric current is less than or equal to predetermined current threshold, and third comparator 122 exports low level；When switch electricity
When short trouble occurs for source outlet side, output electric current of the Switching Power Supply under wave limiting protected mode is greater than predetermined current threshold
Value, third comparator 122 export high level.
The testing result of voltage detecting circuit 11 and the testing result of current detection circuit 12 are transmitted separately to fault-signal
Generative circuit 13 carries out judgement comparison, and (in embodiment illustrated in fig. 3, defect signal generating circuit 13 selects logical AND gate circuit real
It is existing).When power supply works normally, since the output of voltage detecting circuit 11 is low level, meanwhile, the output of current detection circuit 12 is also
Low level, then defect signal generating circuit exports low level, and protection circuit 2 is failure to actuate.
When there is outlet side short trouble in Switching Power Supply, starts wave limiting protected mode, power conversion circuit 3 it is defeated
Voltage will reduce out, and maintain output low pressure constant current state, at this point, voltage detecting circuit 11 will export high level, i.e., it is aforementioned
Predeterminated voltage detects signal；The equally output high level of current detection circuit 12, then defect signal generating circuit 13 also exports high electricity
It puts down to protection circuit 2, which is aforementioned fault-signal, and protection circuit 2 acts, and can forcibly close the PWM of control circuit 4
Signal exits wave limiting protected mode.
If Switching Power Supply is after restart, the short trouble of outlet side is still remained, then Switching Power Supply can be again introduced into
Wave limiting protected mode, correspondingly, protection circuit output default control signal provided in an embodiment of the present invention can be equally triggered,
So that Switching Power Supply is shut down again, reciprocation cycle, into hiccup protections mode, avoid Switching Power Supply by excessively high electric stress or
Thermal stress damage, while the loss of system is also reduced, improve reliability.When Switching Power Supply outlet side short trouble removes, electricity
Source output is established, and voltage detecting circuit exports low level, and defect signal generating circuit also exports low level, and protection circuit is motionless
Make, the pwm signal of control circuit normally exports, and Switching Power Supply is restored to work normally.
Optionally, referring to fig. 4, Fig. 4 is the circuit knot of another protective circuit of switch power source provided in an embodiment of the present invention
Composition.
As shown, voltage detecting circuit 11 select non-isolation type voltage detecting circuit, specifically include first resistor 112,
Second resistance 113 and the second comparator 114, wherein
The first end of first resistor 112 is as the input terminal of voltage detecting circuit 11 and the output end of Switching Power Supply (in figure
Shown with the output end of power conversion circuit 3, can also include other circuits in the prior art) it is connected, first resistor 112
Second end is grounded through second resistance 113.
The cathode of second comparator 114 is connected with the second end of first resistor 112, i.e. first resistor 112 and second resistance
113 common end, the anode access predetermined voltage threshold of the second comparator 114；The output end of second comparator 114 is as voltage
The first input end phase of the output end of detection circuit 11 and defect signal generating circuit 13 (being shown in figure with logical AND gate circuit)
Even.
Current detection circuit 12 equally selects non-isolation type current detection circuit, specifically includes: sampling resistor 123, second
Reverse phase scaling circuit 124 and the 4th comparator 125, wherein
Sampling resistor 123 is serially connected with the output end of Switching Power Supply, specifically, being serially connected with the cathode output end of Switching Power Supply.
The first input end of second reverse phase scaling circuit 124 is connected with the current input terminal of sampling resistor 123, the second reverse phase ratio
Second input terminal of amplifying circuit 124 is connected with the current output terminal of sampling resistor 123, i.e. the second reverse phase scaling circuit
124 input side is connected in parallel with sampling resistor 123.It should be noted that it is identical as the first reverse phase scaling circuit, second
Reverse phase scaling circuit equally uses the prior art to realize, tool of the embodiment of the present invention for the second reverse phase scaling circuit
Body circuit structure is without limitation.
The anode of 4th comparator 125 is connected with the output end of the second reverse phase scaling circuit 124, the 4th comparator
125 cathode accesses predetermined current threshold, output end and event of the output end of the 4th comparator 125 as current detection circuit 12
The second input terminal for hindering signal generating circuit 13 is connected.
The connection relationship of defect signal generating circuit 13 and protection circuit 2, and the company of protection circuit 2 and control circuit 4
It is identical as previous embodiment content to connect relationship, details are not described herein again.The protection circuit that embodiment provides based on shown in Fig. 4, it is split
The action process that powered-down source is protected is substantially are as follows:
Switching Power Supply start completion, 3 output power of power conversion circuit, the output voltage to power conversion circuit 3 are established
Afterwards, non-isolated sampling is carried out by output voltage of the voltage detecting circuit 11 to Switching Power Supply, specifically, passing through first resistor
112 and after second resistance 113 divided, obtain the sampled value of switch power source output voltage and be sent into the second comparator 114 into
Row multilevel iudge, output voltage is higher than predetermined voltage threshold when Switching Power Supply works normally, then the second comparator 114 exports low electricity
When putting down, Switching Power Supply outlet side short trouble, and entering wave limiting protected mode, the output voltage of Switching Power Supply will be less than pre-
If voltage threshold, then the second comparator 114 exports high level.
The output electric current of Switching Power Supply carries out non-isolated sampling by current detection circuit 12, specifically, passing through sampling electricity
It hinders 123 sampled output currents, and is amplified by the second reverse phase scaling circuit 124 and reverse phase, be then fed into the 4th ratio
Judgement is compared compared with device 125.When Switching Power Supply works normally, output electric current is less than or equal to predetermined current threshold, and the 4th compares
Device 125 exports low level；When outlet side short circuit, when overloaded, output electric current is greater than predetermined current threshold to Switching Power Supply, and the 4th compares
Device 125 exports high level.
The testing result of voltage detecting circuit 11 and the testing result of current detection circuit 12 are transmitted separately to fault-signal
Generative circuit 13 carries out judgement comparison.When power supply works normally, since the output of voltage detecting circuit 11 is low level, meanwhile, electricity
The output of current detection circuit 12 is also low level, then defect signal generating circuit exports low level, and protection circuit 2 is failure to actuate.
When there is outlet side short trouble in Switching Power Supply, starts wave limiting protected mode, power conversion circuit 3 it is defeated
Voltage will reduce out, and maintain output low pressure constant current state, at this point, voltage detecting circuit 11 will export high level, i.e., it is aforementioned
Predeterminated voltage detects signal；The equally output high level of current detection circuit 12, then defect signal generating circuit 13 also exports high electricity
It puts down to protection circuit 2, which is aforementioned fault-signal, and protection circuit 2 acts, and can forcibly close the PWM of control circuit 4
Signal exits wave limiting protected mode.
If Switching Power Supply is after restart, the short trouble of outlet side is still remained, then Switching Power Supply can be again introduced into
Wave limiting protected mode, correspondingly, protection circuit output default control signal provided in an embodiment of the present invention can be equally triggered,
So that Switching Power Supply is shut down again, reciprocation cycle, into hiccup protections mode, avoid Switching Power Supply by excessively high electric stress or
Thermal stress damage, while the loss of system is also reduced, improve reliability.When Switching Power Supply outlet side short trouble removes, electricity
Source output is established, and voltage detecting circuit exports low level, and defect signal generating circuit also exports low level, and protection circuit is motionless
Make, the pwm signal of control circuit normally exports, and Switching Power Supply is restored to work normally.
It optionally, is the circuit knot of another protective circuit of switch power source provided in an embodiment of the present invention referring to Fig. 5, Fig. 5
Composition.In the embodiment shown in fig. 5, voltage detecting circuit 11 is using the non-isolation type voltage in embodiment illustrated in fig. 4
Detection circuit, current detection circuit 12 is equally using the non-isolation type current detection circuit in embodiment illustrated in fig. 4.Fig. 4
Unlike illustrated embodiment, defect signal generating circuit 13 is realized by microcontroller.
Determining program is preset in MCU, when output short-circuit occurs in Switching Power Supply and enters wave limiting mode, i.e., in low pressure
When High-current output state, voltage detecting circuit 11 exports high level, and current detection circuit 12 exports high level, and MCU is collected
Corresponding high level signal also exports high level after default determining program judgement, issues fault-signal to protecting circuit.It is subsequent
Action process is identical as foregoing teachings, and details are not described herein again.
It should be noted that the isolated form voltage detecting circuit addressed in the above embodiment of the present invention, non-isolation type voltage
Detection circuit, isolated form current detection circuit, non-isolation type current detection circuit, the fault-signal life realized by logical AND gate
At circuit, and, it can be used by the defect signal generating circuit that MCU is realized with mix and match, i.e. the structure of detection circuit
At being not limited to the above embodiment the composition structure provided, for example, voltage detecting circuit selects isolated form voltage detecting circuit, and
Current detection circuit selects non-isolation type current detection circuit, and defect signal generating circuit has logical AND gate circuit realization etc., In
Can be realized the matched combined in the case where testing principle provided by the invention be all it is optional, equally belong to the present patent application
In the range of protection.
It optionally, is a kind of structural block diagram of Switching Power Supply provided in an embodiment of the present invention referring to Fig. 6, Fig. 6.The present invention is real
The Switching Power Supply for applying example offer includes: power conversion circuit 3, control circuit 4, input filter circuit 5, output filter circuit 6, with
And protective circuit of switch power source provided by any of the above-described embodiment (being shown in figure with detection circuit 1 and protection circuit 2),
In,
Control circuit 4 is used for when receiving the default control signal of protective circuit of switch power source output, and control power becomes
The closing of circuit 3 is changed, and after satisfaction is preset and restarts condition, control power conversion circuit 3 is restarted.
Input terminal of the input terminal of input filter circuit 5 as Switching Power Supply, the input terminal of power conversion circuit 3 and input
The output end of filter circuit 5 is connected, and the input terminal of output filter circuit 6 is connected with the output end of power conversion circuit 3, output filter
The output end of wave circuit 6 connects load, i.e., in the present embodiment, the input terminal of detection circuit 1 as the output end of Switching Power Supply
Really it is connected with the output end of output filter circuit 6.
Switching Power Supply provided in an embodiment of the present invention, after outlet side short trouble, if being provided with wave limiting protection
Mode, will initially enter wave limiting protected mode, and the output state that low pressure constant current is presented in output end will touch in such cases
Protective circuit of switch power source movement is sent out, default control signal is exported, so that the power conversion electricity of control circuit control switch power supply
Road is closed.When satisfaction is preset and restarts condition, Switching Power Supply can restart, if outlet side short trouble is still deposited at this time
Then Switching Power Supply can be again introduced into wave limiting protected mode, correspondingly, can equally trigger provided in an embodiment of the present invention
Circuit output default control signal is protected, so that Switching Power Supply is shut down again, reciprocation cycle forms hiccup protections mode, directly
It is excluded to outlet side short trouble, so as to effectively improve the safety of Switching Power Supply operation.
It optionally, is a kind of flow chart of Switching Power Supply guard method provided in an embodiment of the present invention referring to Fig. 7, Fig. 7, it should
Method can be applied to the Switching Power Supply of embodiment illustrated in fig. 6 offer, specifically, can be applied in the control circuit of the Switching Power Supply
Controller.Certainly, in some cases, it also can be applied to other controllers being separately provided in the Switching Power Supply.Referring to
Fig. 7, the process include:
Step S100 obtains default electric parameter.
After Switching Power Supply start completion, establishing output voltage, the default electric parameter of Switching Power Supply can be obtained.It can
Choosing, default electric parameter may include the output voltage of Switching Power Supply, output one of electric current, can also both wrap simultaneously
It includes.It is of course also possible to be the electric parameter that other can characterize Switching Power Supply working condition, the embodiment of the present invention and default electrical
The specific selection of parameter is without limitation.
Step S110 determines whether switched power output occurs short trouble according to default electric parameter, if so, executing
Step S120, if it is not, returning to step S100.
If determining that output end short trouble occurs for Switching Power Supply according to default electric parameter, S120 is thened follow the steps, is dropped
The output power of low-power translation circuit.It should be noted that the output for judging Switching Power Supply according to default electric parameter
The method whether end occurs short trouble, is referred to mode in the prior art and carries out, the embodiment of the present invention does not limit this
It is fixed.
If determining that short trouble does not occur for the output end of Switching Power Supply according to default electric parameter, illustrate Switching Power Supply work
Make normally, to return to step S100, continue to obtain default electric parameter, continue to monitor the working condition of Switching Power Supply.
Step S120 reduces the output power of power conversion circuit.
In the case where determining that short trouble occurs for switched power output, guard method provided in an embodiment of the present invention,
Control switch power supply enters wave limiting protected mode first, i.e., by way of reducing the output power of power conversion circuit,
Switching Power Supply is protected.Specifically, the controller using guard method provided by the present embodiment can control power conversion
Circuit reduces output voltage, to be finally reached the purpose for reducing output power.
It is envisioned that power conversion circuit is exported in the case where output end short trouble occurs for Switching Power Supply
Electric current will necessarily be increased, or even increase it is very much, it is therefore, low after Switching Power Supply enters wave limiting protected mode
The output of voltage, high current will become the typicalness of Switching Power Supply, this to judge Switching Power Supply according to this typicalness
It is possibly realized into wave limiting protected mode.
Step S130 obtains the default control signal of protective circuit of switch power source output, and according to default control signal control
Power conversion circuit processed is closed.
The Switching Power Supply addressed in the present embodiment includes the protective circuit of switch power source that above content any embodiment provides,
Therefore, the default control signal that the present embodiment is addressed is the protective circuit of switch power source, in the output for detecting Switching Power Supply
Voltage is less than predetermined voltage threshold, and the signal exported in the case that the output electric current of Switching Power Supply is greater than predetermined current threshold.
After controller gets the preset control information number, power conversion circuit is controlled according to the default control signal and is closed, event is stopped
Power output under barrier state.
Step S140 obtains power on signal, controls power conversion circuit according to power on signal and restarts, and returns to step
S100。
After Switching Power Supply is closed, when satisfaction is preset and restarts condition, reboot operation can be executed automatically.Controller acquisition powers on
After signal, power conversion circuit is controlled according to the power on signal and is restarted, connect load output power is continued as.It certainly, can also be same
Shi Zhihang step S100 obtains default electric parameter, is monitored to the working condition of Switching Power Supply.
The Switching Power Supply guard method provided through the embodiment of the present invention, if after Switching Power Supply is restarted, Switching Power Supply is defeated
The short trouble of outlet still remains, then Switching Power Supply can be again introduced into wave limiting protected mode, correspondingly, can equally touch
It sends out protective circuit of switch power source and exports default control signal, so that Switching Power Supply is shut down again, reciprocation cycle forms hiccup and protects
Shield mode, until Switching Power Supply outlet side short trouble excludes, so as to effectively improve the safety of Switching Power Supply operation.
Each embodiment is described in a progressive manner in the present invention, the highlights of each of the examples are with other realities
The difference of example is applied, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
Speech, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is referring to method part illustration
.
The above described is only a preferred embodiment of the present invention, being not intended to limit the present invention in any form.Though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention.It is any to be familiar with those skilled in the art
Member, without departing from the scope of the technical proposal of the invention, all using the methods and technical content of the disclosure above to the present invention
Technical solution makes many possible changes and modifications or equivalent example modified to equivalent change.Therefore, it is all without departing from
The content of technical solution of the present invention, according to the technical essence of the invention any simple modification made to the above embodiment, equivalent
Variation and modification, all of which are still within the scope of protection of the technical scheme of the invention.
Claims (13)
1. a kind of protective circuit of switch power source characterized by comprising detection circuit and protection circuit, wherein
The input terminal of the detection circuit is connected with the output end of Switching Power Supply, for detect the Switching Power Supply be in by
Fault-signal is exported when wave current-limiting protection mode；
It is described protection circuit input terminal be connected with the output end of the detection circuit, it is described protect circuit output end with it is described
The control circuit of Switching Power Supply is connected, for after receiving the fault-signal, Xiang Suoshu control circuit to export default control
Signal, so that the power conversion circuit that the control circuit controls the Switching Power Supply is closed.
2. protective circuit of switch power source according to claim 1, which is characterized in that the detection circuit includes voltage detecting
Circuit, current detection circuit and defect signal generating circuit, wherein
Input of the input terminal of the input terminal of the voltage detecting circuit and the current detection circuit as the detection circuit
End, is connected with the output end of the Switching Power Supply respectively；
The output end of the voltage detecting circuit is connected with the first input end of the defect signal generating circuit, the electric current inspection
The output end of slowdown monitoring circuit is connected with the second input terminal of the defect signal generating circuit；
Output end of the output end of the defect signal generating circuit as the detection circuit, the input with the protection circuit
End is connected；
The voltage detecting circuit is used to detect the output voltage of the Switching Power Supply, when the output voltage is less than predeterminated voltage
When threshold value, output predeterminated voltage detects signal；
The current detection circuit is used to detect the output electric current of the Switching Power Supply, when the output electric current is greater than predetermined current
When threshold value, output predetermined current detects signal；
The defect signal generating circuit is used for while receiving the predeterminated voltage detection signal and predetermined current detection
When signal, the fault-signal is exported.
3. protective circuit of switch power source according to claim 2, which is characterized in that the voltage detecting circuit includes isolation
One of type voltage detecting circuit and non-isolation type voltage detecting circuit.
4. protective circuit of switch power source according to claim 2, which is characterized in that the current detection circuit includes isolation
One of type current detection circuit and non-isolation type current detection circuit.
5. protective circuit of switch power source according to claim 3, which is characterized in that the isolated form voltage detecting circuit packet
It includes: voltage sensor and first comparator, wherein
Input terminal of the input terminal of the voltage sensor as the voltage detecting circuit, the output end with the Switching Power Supply
It is connected, for measuring the output voltage of the Switching Power Supply；
The cathode of the first comparator is connected with the output end of the voltage sensor, and anode accesses the predeterminated voltage threshold
Value, output end and the defect signal generating circuit of the output end of the first comparator as the voltage detecting circuit
First input end is connected.
6. protective circuit of switch power source according to claim 3, which is characterized in that the non-isolation type voltage detecting circuit
It include: first resistor, second resistance and the second comparator, wherein
The first end of the first resistor is as the input terminal of the voltage detecting circuit and the output end phase of the Switching Power Supply
Even, the second end of the first resistor is grounded through the second resistance；
The cathode of second comparator is connected with the second end of the first resistor, and anode accesses the predetermined voltage threshold,
The output end of second comparator as the voltage detecting circuit output end and the defect signal generating circuit the
One input terminal is connected.
7. protective circuit of switch power source according to claim 4, which is characterized in that the isolated form current detection circuit packet
It includes: current sensor, the first reverse phase scaling circuit and third comparator, wherein
Input terminal of the current sensor as the current detection circuit, is set to the output end of the Switching Power Supply；
The first input end of the first reverse phase scaling circuit is connected with the output end of the current sensor, the second input
End is connected with the output end of the Switching Power Supply positioned at the current sensor downstream；
The anode of the third comparator is connected with the output end of the first reverse phase scaling circuit, and cathode access is described pre-
If current threshold, the output end of the third comparator is raw as the output end of the current detection circuit and the fault-signal
It is connected at the second input terminal of circuit.
8. protective circuit of switch power source according to claim 4, which is characterized in that the non-isolation type current detection circuit
It include: sampling resistor, the second reverse phase scaling circuit and the 4th comparator, wherein
The sampling resistor is serially connected with the output end of the Switching Power Supply；
The first input end of the second reverse phase scaling circuit is connected with the current input terminal of the sampling resistor, and second is defeated
Enter end to be connected with the current output terminal of the sampling resistor；
The anode of 4th comparator is connected with the output end of the second reverse phase scaling circuit, and cathode access is described pre-
If current threshold, the output end of the 4th comparator is raw as the output end of the current detection circuit and the fault-signal
It is connected at the second input terminal of circuit.
9. protective circuit of switch power source according to claim 2, which is characterized in that the defect signal generating circuit includes
One of logical AND gate circuit and microcontroller.
10. -9 described in any item protective circuit of switch power source according to claim 1, which is characterized in that the protection circuit packet
Include at least one of current foldback circuit, short-circuit protection circuit, overvoltage crowbar, thermal-shutdown circuit.
11. -9 described in any item protective circuit of switch power source according to claim 1, which is characterized in that the default control letter
It number include closing machine control signal or enable signal, wherein
The power supply for closing machine control signal and being used to cut off the control circuit, so that the power conversion circuit of the Switching Power Supply
It closes；
The enable signal executes power-off operation for triggering the control circuit, by opening described in control circuit closing
The power conversion circuit in powered-down source.
12. a kind of Switching Power Supply characterized by comprising input filter circuit, output filter circuit, control circuit, power become
Change circuit and the described in any item protective circuit of switch power source of claim 1-11, wherein
The control circuit is used for when receiving default control signal, is controlled the power conversion circuit and is closed, and is meeting
It presets after restarting condition, controls the power conversion circuit and restart；
Input terminal of the input terminal of the input filter circuit as the Switching Power Supply, the output end of the input filter circuit
It is connected with the input terminal of the power conversion circuit；
The output end of the power conversion circuit is connected with the input terminal of the output filter circuit, the output filter circuit
Output end connects load as the output end of the Switching Power Supply.
13. a kind of Switching Power Supply guard method, which is characterized in that applied to the Switching Power Supply described in claim 12, the side
Method includes:
Obtain default electric parameter；
If determining the switched power output short circuit according to the default electric parameter, the output work of power conversion circuit is reduced
Rate；
Default control signal is obtained, and the power conversion circuit is controlled according to the default control signal and is closed, wherein is described
Default control signal is the protective circuit of switch power source in the Switching Power Supply, in the output voltage for detecting the Switching Power Supply
Less than predetermined voltage threshold, and the output electric current of the Switching Power Supply is greater than the signal exported in the case where predetermined current threshold；
Power on signal is obtained, the power conversion circuit is controlled according to the power on signal and is restarted, and returns and executes the acquisition
Default electric parameter step.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112054663A (en) * | 2020-07-23 | 2020-12-08 | 北京控制工程研究所 | Low-temperature-drift overvoltage protection system |
| CN112881787A (en) * | 2021-01-13 | 2021-06-01 | 常州同惠电子股份有限公司 | Low-input-impedance high-voltage circuit for voltage test and implementation method |
| CN113541488A (en) * | 2021-06-28 | 2021-10-22 | 中车青岛四方机车车辆股份有限公司 | Boost chopper circuit, protection circuit, control method, equipment and vehicle |
| CN113595372A (en) * | 2021-07-28 | 2021-11-02 | 阳光电源股份有限公司 | Protection circuit, application device thereof and circuit protection method |
| CN113933738A (en) * | 2021-09-08 | 2022-01-14 | 国网甘肃省电力公司电力科学研究院 | Monitoring method and device for switching power supply |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09140154A (en) * | 1995-11-15 | 1997-05-27 | Hitachi Ltd | Inverter protector |
| US5892351A (en) * | 1997-08-29 | 1999-04-06 | Compaq Computer Corporation | DC-isolated converting battery module |
| CN103138590A (en) * | 2011-12-02 | 2013-06-05 | 中兴通讯股份有限公司 | Current-limiting protection method and device of resonance circuit |
| CN104506042A (en) * | 2014-12-23 | 2015-04-08 | 刘孝涛 | High-reliability constant-current vehicle-mounted DC (direct current)-DC converter and control method thereof |
| CN107659148A (en) * | 2016-07-26 | 2018-02-02 | 刘阳 | A kind of active-clamp slope restoring circuit |
| CN108566077A (en) * | 2017-12-19 | 2018-09-21 | 晶晨半导体(上海)股份有限公司 | A kind of power-supply system with self-learning function |
| CN109756111A (en) * | 2017-11-01 | 2019-05-14 | 恩智浦有限公司 | Circuit for switched-mode power supply |
| CN109873562A (en) * | 2019-02-11 | 2019-06-11 | 安徽工业大学 | A kind of LLC resonant converter structure and its control method |
-
2019
- 2019-08-15 CN CN201910755104.6A patent/CN110416974B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09140154A (en) * | 1995-11-15 | 1997-05-27 | Hitachi Ltd | Inverter protector |
| US5892351A (en) * | 1997-08-29 | 1999-04-06 | Compaq Computer Corporation | DC-isolated converting battery module |
| CN103138590A (en) * | 2011-12-02 | 2013-06-05 | 中兴通讯股份有限公司 | Current-limiting protection method and device of resonance circuit |
| CN104506042A (en) * | 2014-12-23 | 2015-04-08 | 刘孝涛 | High-reliability constant-current vehicle-mounted DC (direct current)-DC converter and control method thereof |
| CN107659148A (en) * | 2016-07-26 | 2018-02-02 | 刘阳 | A kind of active-clamp slope restoring circuit |
| CN109756111A (en) * | 2017-11-01 | 2019-05-14 | 恩智浦有限公司 | Circuit for switched-mode power supply |
| CN108566077A (en) * | 2017-12-19 | 2018-09-21 | 晶晨半导体(上海)股份有限公司 | A kind of power-supply system with self-learning function |
| CN109873562A (en) * | 2019-02-11 | 2019-06-11 | 安徽工业大学 | A kind of LLC resonant converter structure and its control method |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112054663A (en) * | 2020-07-23 | 2020-12-08 | 北京控制工程研究所 | Low-temperature-drift overvoltage protection system |
| CN112054663B (en) * | 2020-07-23 | 2022-03-04 | 北京控制工程研究所 | Low-temperature-drift overvoltage protection system |
| CN112881787B (en) * | 2021-01-13 | 2023-03-14 | 常州同惠电子股份有限公司 | Low-input-impedance high-voltage circuit for voltage test and implementation method |
| CN112881787A (en) * | 2021-01-13 | 2021-06-01 | 常州同惠电子股份有限公司 | Low-input-impedance high-voltage circuit for voltage test and implementation method |
| CN113541488A (en) * | 2021-06-28 | 2021-10-22 | 中车青岛四方机车车辆股份有限公司 | Boost chopper circuit, protection circuit, control method, equipment and vehicle |
| CN113541488B (en) * | 2021-06-28 | 2022-09-06 | 中车青岛四方机车车辆股份有限公司 | Boost chopper circuit, protection circuit, control method, equipment and vehicle |
| CN113595372A (en) * | 2021-07-28 | 2021-11-02 | 阳光电源股份有限公司 | Protection circuit, application device thereof and circuit protection method |
| CN113933738A (en) * | 2021-09-08 | 2022-01-14 | 国网甘肃省电力公司电力科学研究院 | Monitoring method and device for switching power supply |
| CN113933738B (en) * | 2021-09-08 | 2024-04-16 | 国网甘肃省电力公司电力科学研究院 | Monitoring method and device for switching power supply |
| CN115764812A (en) * | 2022-12-26 | 2023-03-07 | 广州市德珑电子器件有限公司 | Automatic protection method for switching power supply and switching power supply |
| CN116742571A (en) * | 2023-08-16 | 2023-09-12 | 厦门拓宝科技有限公司 | Self-adjusting overcurrent protection circuit |
| CN116742571B (en) * | 2023-08-16 | 2023-11-21 | 厦门拓宝科技有限公司 | Self-adjusting overcurrent protection circuit |
| CN117096834A (en) * | 2023-10-18 | 2023-11-21 | 深圳市力生美半导体股份有限公司 | Switching power supply and protection method thereof |
| CN117096834B (en) * | 2023-10-18 | 2024-02-27 | 深圳市力生美半导体股份有限公司 | Switching power supply and protection method thereof |
| CN117895420A (en) * | 2024-03-14 | 2024-04-16 | 电子科技大学 | Pulse width detection protection circuit for power module of rotary traveling wave tube |
| CN117895420B (en) * | 2024-03-14 | 2024-06-07 | 电子科技大学 | Pulse width detection protection circuit for power module of rotary traveling wave tube |
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