CN204391677U - A kind of input voltage overvoltage crowbar - Google Patents
A kind of input voltage overvoltage crowbar Download PDFInfo
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- CN204391677U CN204391677U CN201420777919.7U CN201420777919U CN204391677U CN 204391677 U CN204391677 U CN 204391677U CN 201420777919 U CN201420777919 U CN 201420777919U CN 204391677 U CN204391677 U CN 204391677U
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Abstract
The utility model discloses a kind of input voltage overvoltage crowbar, comprising: zero passage detection module, overvoltage detection module, protecting control module and switch; Whether zero passage detection module is in the zero passage period for the input voltage detecting described AC power and provide; Overvoltage detection module is for the whether overvoltage of the input voltage that detects described AC power and provide; Protecting control module is used for when described input voltage overvoltage, controls described switch and disconnects; And in input voltage not overvoltage and when being in the zero passage period, controlling described switch and recover conducting.The protective circuit that the utility model embodiment provides; when input voltage overvoltage; control switch disconnects; and in input voltage not overvoltage and when being in the zero passage period; again control switch conducting, during due to switch again conducting, input voltage is in the zero passage period; therefore avoiding when switch resets again causes circuit to damage because input voltage is too high, thus can realize the overvoltage protection of input voltage safely and effectively.
Description
Technical field
The utility model and overvoltage protection field, particularly relate to a kind of input voltage overvoltage crowbar.
Background technology
When power work is in high input voltage environment, electrochemical capacitor in power supply, easily there is understrressing in master power switch pipe, thus cause serious heating, if do not possess over-voltage protecting function in circuit, easy initiation fire, conventional overvoltage crowbar is by overvoltage detection module, protecting control module and relay composition, overvoltage detection module is for detecting input voltage, after input voltage reaches overvoltage detection reference value, protecting control module sends signal and turns off relay, but when needing again to reset after disconnection relay, the alternating voltage of input just may be in peak value, now will produce very high surge current in input circuit, circuit safety is difficult to be protected.
Utility model content
In view of this, main purpose of the present utility model is to provide a kind of input voltage overvoltage crowbar, and it is characterized in that, described protective circuit is arranged between AC power and Switching Power Supply, comprising:
Switch;
Be connected with described AC power, for the input voltage instantaneous value that described AC power provided compared with default zero passage reference voltage, produce the zero passage detection module of the first signal;
Be connected with described AC power, for the input voltage amplitude that described AC power provided compared with preset overpressure reference voltage, produce the overvoltage detection module of secondary signal;
Input is connected with the output of described zero passage detection module, the output of described overvoltage detection module respectively, when the input voltage amplitude that described secondary signal characterizes described AC power and provides is greater than described preset overpressure reference voltage, controls described switch and disconnect; And when the input voltage amplitude that described secondary signal characterizes described AC power and provides is less than described preset overpressure reference voltage and the input voltage instantaneous value that described in described first characterization, AC power provides is not more than described default zero passage reference voltage, control the protecting control module that described switch recovers conducting;
The control end of described switch is connected with the output of described protecting control module, and all the other two ends are connected between described AC power and described Switching Power Supply.
Above-mentioned protective circuit, preferably, amplitude when described preset overpressure reference voltage normally works higher than alternating voltage; Amplitude when described zero passage reference voltage normally works lower than alternating voltage.
Above-mentioned protective circuit, preferably, also comprises: high pressure lightning protection device;
Described high pressure lightning protection device is arranged between described AC power and described switch, and its input is connected with the output of described AC power; Its output is connected with described switch with the input of described zero passage detection module, overvoltage detection module.
Above-mentioned protective circuit, preferably, described switch is gate-controlled switch device.
Above-mentioned protective circuit, preferably, described gate-controlled switch device is relay or switching tube.
Above-mentioned protective circuit, preferably, described protecting control module comprises: the first comparator U1; Second comparator U2 and stagnant loop circuit; The positive input of the second comparator U2 described in one termination of described stagnant loop circuit, the output of the second comparator U2 described in another termination; First signal V1 is input to the normal phase input end of the first comparator U1, and secondary signal V2 is input to the normal phase input end of the second comparator U2;
Also comprise: delay circuit, the first triode Q1, the second triode Q2, the first diode D1, the second diode D2, resistance R1, the 3rd comparator U3, latching circuit and switching tube S1;
Wherein:
The base stage of described first triode Q1 is connected by the output of described delay circuit with described first comparator U1, and collector electrode is connected with the base stage of described second triode Q2, and emitter is connected with described switching tube S1 and ground connection;
The collector electrode of described second triode Q2 is connected with the output of described second comparator U2, and emitter is connected with described switching tube S1 by described resistance R1;
The anode of described first diode D1 is connected with the emitter of described second triode Q2, and negative electrode is connected with the output of described second comparator U2 by described second diode D2;
Described latching circuit is in parallel with described 3rd comparator U3, and the positive input of described 3rd comparator U3 is connected with the anode of described second diode D2, and the output of described 3rd comparator U3 is connected with described switching tube S1.
Above-mentioned protective circuit, preferably, described switch is normal-open type relay;
The control end of described switch is the coil of described relay;
Described coil one end connects auxiliary electric power supply Vcc, and the other end is connected with described switching tube S1.
Above-mentioned protective circuit, preferably, described protecting control module is analog control circuit or digital control circuit.
Above-mentioned protective circuit, preferably, described delay circuit is RC delay circuit.
Above-mentioned protective circuit, preferably, described high pressure lightning protection device and described Switching Power Supply overall package.
The utility model provides a kind of input voltage overvoltage crowbar, and described protective circuit is arranged between AC power and Switching Power Supply, comprising: zero passage detection module, overvoltage detection module, protecting control module and switch; Described zero passage detection module is connected with described AC power, for the input voltage instantaneous value that described AC power provided compared with default zero passage reference voltage, produces the first signal; Described overvoltage detection module is connected with described AC power, for the input voltage amplitude that described AC power provided compared with preset overpressure reference voltage, produces secondary signal; The input of described protecting control module is connected with the output of described zero passage detection module, the output of described overvoltage detection module respectively, the control end of described switch is connected with the output of described protecting control module, and all the other two ends are connected between described AC power and described Switching Power Supply; Described protecting control module is used for, and when the input voltage amplitude that described secondary signal characterizes described AC power and provides is greater than described preset overpressure reference voltage, controls described switch and disconnects; And when the input voltage amplitude that described secondary signal characterizes described AC power and provides is less than described preset overpressure reference voltage and the input voltage instantaneous value that described in described first characterization, AC power provides is not more than described default zero passage reference voltage, controls described switch and recover conducting.
The protective circuit that the utility model embodiment provides, when the input voltage overvoltage that AC power provides, control switch disconnects, and AC power input voltage not overvoltage is provided and lower than default zero passage reference voltage time, recover to control switch conducting, during due to switch recovery conducting, the input voltage instantaneous value of AC power is not more than default zero passage reference voltage, therefore avoid to cause in input circuit because input voltage is too high when switch resets again and produce very high surge current and damage circuit, thus the overvoltage protection of input voltage can be realized safely and effectively.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiment of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
Fig. 1 is the structural representation of a kind of input voltage overvoltage crowbar of the utility model;
Fig. 2 is the another structural representation of a kind of input voltage of the utility model overvoltage crowbar;
Fig. 3 is the signal graph of a kind of input voltage overvoltage crowbar of the utility model;
Fig. 4 is the control logic block diagram of a kind of input voltage overvoltage crowbar of the utility model;
Fig. 5 is the another structural representation of a kind of input voltage of the utility model overvoltage crowbar.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
The purpose of this utility model is to provide a kind of input voltage overvoltage crowbar, and described protective circuit is arranged between AC power and Switching Power Supply, comprising: zero passage detection module 101, overvoltage detection module 102, protecting control module 103 and switch 104;
Described zero passage detection module 101 is connected with described AC power, for the input voltage instantaneous value that described AC power provided compared with default zero passage reference voltage, produces the first signal;
Described overvoltage detection module 102 is connected with described AC power, for the input voltage amplitude that described AC power provided compared with preset overpressure reference voltage, produces secondary signal;
The input of described protecting control module 103 is connected with the output of described zero passage detection module 101, the output of described overvoltage detection module 102 respectively, the control end of described switch 104 is connected with the output of described protecting control module 103, and all the other two ends are connected between described AC power and described Switching Power Supply;
Described protecting control module 104 for, when the input voltage amplitude that described secondary signal characterizes described AC power and provides is greater than described preset overpressure reference voltage, controls described switch 104 and disconnect; And when the input voltage amplitude that described secondary signal characterizes described AC power and provides is less than described preset overpressure reference voltage and the input voltage instantaneous value that described in described first characterization, AC power provides is not more than described default zero passage reference voltage, controls described switch 104 and recover conducting.
It should be noted that, described switch 104 recovers conducting and refers to, before protecting control module 104 controls its recovery conducting, this switch 104 is in off-state; Also be; described protecting control module 104 is when the input voltage amplitude that described secondary signal characterizes described AC power and provides is less than described preset overpressure reference voltage and the input voltage instantaneous value that described in described first characterization, AC power provides is not more than described default zero passage reference voltage; if switch 104 is in off-state before this moment, then control switch 104 conducting.
In the utility model embodiment, when the input voltage amplitude that protecting control module provides when described secondary signal characterizes described AC power is greater than described preset overpressure reference voltage, controls described switch and disconnect; And when the input voltage amplitude that described secondary signal characterizes described AC power and provides is less than described preset overpressure reference voltage and the input voltage instantaneous value that described in described first characterization, AC power provides is not more than described default zero passage reference voltage, controls described switch and recover conducting.During due to switch again conducting; the input voltage instantaneous value of AC power is not more than default zero passage reference voltage; also namely AC-input voltage is now in the zero passage period is very low magnitude of voltage; therefore avoid to cause in input circuit because input voltage is too high when switch resets again and produce very high surge current and damage circuit, thus the overvoltage protection of input voltage can be realized safely and effectively.
Amplitude when described preset overpressure reference voltage normally works higher than alternating voltage, like this when the amplitude of alternating voltage input is abnormal, namely higher than amplitude during normal work time, protecting control module controls switch disconnects, to protect rear level power supply in order to avoid excessive pressure damages; Amplitude when described zero passage reference voltage normally works lower than alternating voltage; generally lower than the half of alternating voltage amplitude during concrete enforcement, be unlikely to alternating voltage instantaneous value like this when protecting control module controls switch recovers conducting too high and produce surge current.
In the utility model embodiment, on the basis of same circuit structure, can also realize by following preferred version, described zero passage detection module 101 detects the input voltage that AC power provides, by described input voltage compared with the zero passage reference voltage preset, the first signal is produced according to comparative result, in the utility model embodiment, first a zero passage reference voltage is preset, the amplitude of zero passage reference voltage can set according to the amplitude of input voltage, describedly be detected as real-time detection, think when input voltage instantaneous value is not more than the zero passage reference signal preset and be now in the zero passage period, such as, when AC power is 220V line voltage, setting zero passage reference voltage is 10V, the time period being not more than 10V when the instantaneous value of input voltage regards as the zero passage period, the first signal designation is utilized whether to be in nought state.
Described overvoltage detection module 102 detects the input voltage that AC power provides, by described input voltage compared with the overvoltage reference voltage preset, secondary signal is produced according to comparative result, first an overvoltage reference voltage is preset, the amplitude of overvoltage reference voltage can set according to the amplitude of input voltage, think when input voltage is greater than the overvoltage reference voltage preset and be now in overvoltage condition, such as, when AC power is 220V line voltage, setting overvoltage reference voltage is 250V, overvoltage condition is in when the instantaneous value of input voltage reaches or surpasses 250V, secondary signal is utilized to indicate whether to be in overvoltage condition,
The input voltage overvoltage crowbar that application the utility model provides, described protecting control module 103 produces the 3rd signal judging input voltage state according to the first signal and secondary signal, and by the 3rd signal controlling switch 104, switch 104 is made to be in off-state when input voltage overvoltage, after this control switch when input voltage not overvoltage being detected and be in the zero passage period and be again in conducting state, cause in input circuit because input voltage is too high when avoiding switch 104 again to reset and produce very high surge current and damage circuit, thus the overvoltage protection of input voltage can be realized safely and effectively.
As shown in Figure 2; for the structural representation of the utility model input voltage overvoltage crowbar one specific embodiment; corresponding with Fig. 1; described switch adopts relay to realize; described relay 204 can be closed type relay or be normal-open type relay; also switching tube etc. can be used; as long as be controlled switching device; in addition; between Switching Power Supply and AC power, be also provided with high pressure lightning protection device 205, adopt independently external structure, independently encapsulate with Switching Power Supply; also can adopt embedding structure, be packaged together with Switching Power Supply.
In the utility model embodiment, described high pressure lightning protection device is arranged between described AC power and described switch, and its input is connected with the output of described AC power; Output is connected with described switch with the input of described zero passage detection module, overvoltage detection module respectively.Also, namely, during the detection AC-input voltage of described zero passage detection module and described overvoltage detection module, AC-input voltage is obtained by the voltage detecting high pressure lightning protection device output.
In the utility model embodiment, zero passage detection module 101 detects input voltage, compared with the zero passage reference voltage preset, the first signal V1 is produced according to comparative result, overvoltage detection module 102 detects input voltage, compared with the overvoltage reference voltage preset, secondary signal V2 is produced according to comparative result, protecting control module 103 produces the 3rd signal V3 judging input voltage state according to the first signal V1 and secondary signal V2, V1, the output signal schematic diagram of V2 and V3 as shown in Figure 4, the high level of V1 represents input voltage instantaneous value not higher than the zero passage reference voltage preset, zero passage detection module detects that current voltage was in nought state, the high level of V2 represents that input voltage amplitude is lower than the overvoltage reference voltage preset, overvoltage detection module detects current voltage not overvoltage, during the high level of V3, protecting control module 103 control relay 204 is in conducting state, protecting control module 103 is the first priority with the signal V2 that overvoltage detection module produces, with zero passage detection module produce signal V1 be the second priority, no matter namely during overvoltage, whether the equal control relay 204 of zero passage disconnects.
The concrete control logic block diagram of the present embodiment as shown in Figure 4, take AC power as 220V line voltage, the zero passage reference voltage preset is 10V, the overvoltage reference voltage preset is 250V is example: wherein, V1 high level represents that input voltage is in the zero passage period, and V1 low level represents that input voltage is in the not zero passage period; V2 high level represents that input voltage is in not overvoltage condition, and V2 low level represents that input voltage is in overvoltage condition.
During state S1, V1 low level, V2 low level, now input voltage overvoltage not zero passage, namely input voltage amplitude is greater than 250V and input voltage instantaneous value is greater than 10V, and V3 is in low level, and protecting control module 103 control relay 204 disconnects;
During state S2, V1 high level, V2 low level, now input voltage overvoltage and zero passage, namely input voltage amplitude is greater than 250V and input voltage instantaneous value is not more than 10V, according to first priority of V2, V3 is low level, and protecting control module 103 control relay 204 disconnects;
During state S3, V1 low level, V2 high level, now input voltage not overvoltage but only zero, namely input voltage amplitude is less than 250V and input voltage instantaneous value is greater than 10V, and current relay 204 is in off-state, for avoiding producing surge current, can not the conducting of reset relay 204, therefore V3 is in low level, so time protecting control module 103 continue control relay 204 and remain open state;
During state S4, V1 high level, V2 high level, but now input voltage not overvoltage zero passage, namely input voltage amplitude is less than 250V and input voltage instantaneous value is not more than 10V, now can the conducting of reset relay 204, V3 is high level, the conducting of protecting control module 103 control relay 204;
During state S5; V1 low level; V2 high level, now input voltage not overvoltage but only zero, but be in conducting state due to current relay 204; therefore can the conducting state of latching relay 204; V3 high level, protecting control module 103 continues control relay 204 and keeps conducting, and carries out self-locking in this time period; ensure the channel status of input power supply, S5 state is the self-locking state of input voltage.
Because input voltage is generally in sinusoidal wave state variation, when the amplitude of input voltage changes, carry out the function judging to realize input voltage overvoltage protection according to above-mentioned state.
As shown in Figure 5, for in the utility model input voltage overvoltage crowbar, the structural representation of the specific embodiment of protecting control module, setting the first signal V1 is input voltage zero passage detection signal, secondary signal V2 is input voltage overvoltage detection signal, and RLY1 is normal-open type relay; Wherein, the high level of V1 represents input voltage instantaneous value not higher than the zero passage reference voltage preset, zero passage detection module detects that current voltage is in the zero passage period, the high level of V2 represents that input voltage amplitude is lower than the overvoltage reference voltage preset, and overvoltage detection module detects current voltage not overvoltage; Also namely V1 low level represents that input voltage is in the non-zero passage period, and V2 low level represents that input voltage is in overvoltage condition.
Described high pressure lightning protection device is connected on Switching Power Supply input; Described Switching Power Supply comprises lightning protection and EMC filtration module, rectification module, main power model and feedback circuit.
Described protecting control module comprises: the first comparator U1; Second comparator U2 and stagnant loop circuit; The positive input of the second comparator U2 described in one termination of described stagnant loop circuit, the output of the second comparator U2 described in another termination; First signal V1 is input to the normal phase input end of the first comparator U1, and secondary signal V2 is input to the normal phase input end of the second comparator U2,
Also comprise: delay circuit, the first triode Q1, the second triode Q2, the first diode D1, the second diode D2, resistance R1, the 3rd comparator U3, latching circuit and switching tube S1;
Wherein:
The base stage of described first triode Q1 is connected by the output of described delay circuit with described first comparator U1, and collector electrode is connected with the base stage of described second triode Q2, and emitter is connected with described switching tube S1 and ground connection;
The collector electrode of described second triode Q2 is connected with the output of described second comparator U2, and emitter is connected with described switching tube S1 by described resistance R1;
The anode of described first diode D1 is connected with the emitter of described second triode Q2, and negative electrode is connected with the output of described second comparator U2 by described second diode D2;
Described latching circuit is in parallel with described 3rd comparator U3, and the positive input of described 3rd comparator U3 is connected with the anode of described second diode D2, and the output of described 3rd comparator U3 is connected with described switching tube S1.
In the utility model embodiment, the control to relay is realized by Analogical Electronics, comprise delay circuit, stagnant loop circuit, latching circuit, relay R LY1, winding power power Vcc, voltage comparator U1, U2, U3, triode Q1, Q2, diode D1, D2, resistance R1 and switching tube S1, wherein Vref1, Vref2, Vref3 are reference voltage, Vref1 is default zero passage reference signal, and Vref2 is default overvoltage reference signal.
When secondary signal V2 is low level (also namely characterizes input voltage and be in overvoltage condition); it is less than Vref2; comparator U2 output low level; now by diode D2, comparator U3 in-phase input end is dragged down; no matter the first signal V1 is greater than Vref1 or is less than Vref1, and comparator U3 is in low level always, and switching tube S1 disconnects; relay disconnects, and realizes the protection to circuit.
When secondary signal V2 is high level (also namely characterizes input voltage and be in not overvoltage condition), it is greater than Vref1, and comparator U2 exports high level, and now diode D2 ends, and the level height of the output of comparator U3 is determined by diode D1; Now discuss in two kinds of situation:
1, first (also characterize input voltage when signal V1 is high level and be in the zero passage period), be greater than Vref1, voltage comparator U1 exports high level, and this high level is after delay circuit, drive triode Q1 conducting, the base voltage of triode Q2 is dragged down, triode Q2 conducting, diode D1 anode high level and conducting, comparator U3 normal phase input end high level, it is made to export high level, switching tube S1 conducting, relay closes.
When comparator U3 exports high level, set high by comparator U3 in-phase input end by latching circuit, comparator U3 is in high level always, and what keep input voltage supplies electric conducting state, and switching tube S1 remains closed, and relay remains closed; Comparator U3 exports after high level, and under the effect of latching circuit, all maintain high level, after this no matter the first signal V1 is high level or low level, and comparator U3 exports high level and makes that switching tube S1 is closed, relay closes; Until secondary signal V2 becomes low level (also namely characterize input voltage and be in overvoltage condition), comparator U2 output low level, is now dragged down comparator U3 in-phase input end by diode D2, and comparator U3 just can output low level.
2, (also characterize input voltage when the first signal V1 is low level and be in the non-zero passage period), be less than Vref1, voltage comparator U1 output low level, triode Q1 ends, and causes triode Q2 base stage no current and ends; If this moment, preceding switch pipe S1 was off state, namely relay is off state, then latching circuit does not act on, and cause comparator U3 still output low level, switching tube S1 also will maintain off-state, and relay disconnects.
It should be noted that:
Described switching tube S1 can be any switching tube, as triode, metal-oxide-semiconductor, IGBT etc.;
Described delay circuit can be RC delay circuit, also can be arbitrary delay circuit;
Described not contact between Vref1, Vref2, Vref3, can be equal, also can be unequal;
The function that protecting control module also can utilize Fundamental Digital Circuit to control to realize it, and be not limited to the circuit design of above Analogical Electronics.
Application specific embodiment of the utility model; can be implemented in the disconnection of control relay during input voltage overvoltage; also the connection of the reset relay when crossing nought state after input voltage is not in overvoltage condition can be realized; cause in input circuit because input voltage is too high when avoiding relay again to reset and produce very high surge current, thus the overvoltage protection of input voltage can be realized safely and effectively.
It should be noted that, each embodiment in this specification all adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar part mutually see.For device class embodiment, due to itself and embodiment of the method basic simlarity, so description is fairly simple, relevant part illustrates see the part of embodiment of the method.
Finally, also it should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
Above circuit provided by the utility model is described in detail, apply specific case herein to set forth principle of the present utility model and execution mode, the explanation of above embodiment just understands method of the present utility model and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
Claims (10)
1. an input voltage overvoltage crowbar, is characterized in that, described protective circuit is arranged between AC power and Switching Power Supply, comprising:
Switch;
Be connected with described AC power, for the input voltage instantaneous value that described AC power provided compared with default zero passage reference voltage, produce the zero passage detection module of the first signal;
Be connected with described AC power, for the input voltage amplitude that described AC power provided compared with preset overpressure reference voltage, produce the overvoltage detection module of secondary signal;
Input is connected with the output of described zero passage detection module, the output of described overvoltage detection module respectively, when the input voltage amplitude that described secondary signal characterizes described AC power and provides is greater than described preset overpressure reference voltage, controls described switch and disconnect; And when the input voltage amplitude that described secondary signal characterizes described AC power and provides is less than described preset overpressure reference voltage and the input voltage instantaneous value that described in described first characterization, AC power provides is not more than described default zero passage reference voltage, control the protecting control module that described switch recovers conducting;
The control end of described switch is connected with the output of described protecting control module, and all the other two ends are connected between described AC power and described Switching Power Supply.
2. protective circuit according to claim 1, is characterized in that, amplitude when described preset overpressure reference voltage normally works higher than alternating voltage; Amplitude when described zero passage reference voltage normally works lower than alternating voltage.
3. protective circuit according to claim 1, is characterized in that, also comprises: high pressure lightning protection device;
Described high pressure lightning protection device is arranged between described AC power and described switch, and its input is connected with the output of described AC power; Its output is connected with described switch with the input of described zero passage detection module, overvoltage detection module.
4. protective circuit according to claim 1, is characterized in that, described switch is gate-controlled switch device.
5. protective circuit according to claim 4, is characterized in that, described gate-controlled switch device is relay or switching tube.
6. protective circuit according to claim 1, is characterized in that, described protecting control module comprises: the first comparator U1; Second comparator U2 and stagnant loop circuit; The positive input of the second comparator U2 described in one termination of described stagnant loop circuit, the output of the second comparator U2 described in another termination; First signal V1 is input to the normal phase input end of the first comparator U1, and secondary signal V2 is input to the normal phase input end of the second comparator U2;
Also comprise: delay circuit, the first triode Q1, the second triode Q2, the first diode D1, the second diode D2, resistance R1, the 3rd comparator U3, latching circuit and switching tube S1;
Wherein:
The base stage of described first triode Q1 is connected by the output of described delay circuit with described first comparator U1, and collector electrode is connected with the base stage of described second triode Q2, and emitter is connected with described switching tube S1 and ground connection;
The collector electrode of described second triode Q2 is connected with the output of described second comparator U2, and emitter is connected with described switching tube S1 by described resistance R1;
The anode of described first diode D1 is connected with the emitter of described second triode Q2, and negative electrode is connected with the output of described second comparator U2 by described second diode D2;
Described latching circuit is in parallel with described 3rd comparator U3, and the positive input of described 3rd comparator U3 is connected with the anode of described second diode D2, and the output of described 3rd comparator U3 is connected with described switching tube S1.
7. protective circuit according to claim 5, is characterized in that, described switch is normal-open type relay;
The control end of described switch is the coil of described relay;
Described coil one end connects auxiliary electric power supply Vcc, and the other end is connected with described switching tube S1.
8. protective circuit according to claim 1, is characterized in that, described protecting control module is analog control circuit or digital control circuit.
9. protective circuit according to claim 6, is characterized in that, described delay circuit is RC delay circuit.
10. protective circuit according to claim 3, is characterized in that, described high pressure lightning protection device and described Switching Power Supply overall package.
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| CN201420777919.7U CN204391677U (en) | 2014-12-10 | 2014-12-10 | A kind of input voltage overvoltage crowbar |
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| CN201420777919.7U CN204391677U (en) | 2014-12-10 | 2014-12-10 | A kind of input voltage overvoltage crowbar |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104466900A (en) * | 2014-12-10 | 2015-03-25 | 英飞特电子（杭州）股份有限公司 | Input voltage overvoltage protection circuit |
| CN109661054A (en) * | 2017-10-11 | 2019-04-19 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating apparatus, electromagnetic heating system and its heating control apparatus and method |
| CN113934242A (en) * | 2021-10-08 | 2022-01-14 | 冠州科技(广州)有限公司 | Heating control device and heating system |
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2014
- 2014-12-10 CN CN201420777919.7U patent/CN204391677U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104466900A (en) * | 2014-12-10 | 2015-03-25 | 英飞特电子（杭州）股份有限公司 | Input voltage overvoltage protection circuit |
| CN104466900B (en) * | 2014-12-10 | 2017-12-01 | 英飞特电子（杭州）股份有限公司 | A kind of input voltage overvoltage crowbar |
| CN109661054A (en) * | 2017-10-11 | 2019-04-19 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating apparatus, electromagnetic heating system and its heating control apparatus and method |
| CN109661054B (en) * | 2017-10-11 | 2021-04-20 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating equipment, electromagnetic heating system and heating control device and method thereof |
| CN113934242A (en) * | 2021-10-08 | 2022-01-14 | 冠州科技(广州)有限公司 | Heating control device and heating system |
| CN113934242B (en) * | 2021-10-08 | 2023-08-18 | 冠州科技(广州)有限公司 | Heating control device and heating system |
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