CN219227834U - Heater fault protection circuit - Google Patents
Heater fault protection circuit Download PDFInfo
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- CN219227834U CN219227834U CN202222824855.9U CN202222824855U CN219227834U CN 219227834 U CN219227834 U CN 219227834U CN 202222824855 U CN202222824855 U CN 202222824855U CN 219227834 U CN219227834 U CN 219227834U
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Abstract
The utility model discloses a heater fault protection circuit, which relates to the technical field of fault protection and comprises a power supply module, a power supply circuit and a power supply circuit, wherein the power supply module is used for supplying power; the temperature control module is used for detecting the temperature and outputting a control signal; the heater isolation control module is used for isolating and controlling the work of the heater; the overcurrent detection module is used for carrying out current sampling and signal conditioning on the heater; the overcurrent protection module is used for controlling the work of the temperature control module; and the heater protection module is used for controlling the operation of the heater isolation control module. The heater fault protection circuit detects the temperature of the heater, regulates the upper limit and the lower limit of the temperature through the temperature control circuit, stops the operation of the heater when the temperature is too high, detects the current and judges the overcurrent of the operating heater, realizes overcurrent protection control of the heater when the overcurrent occurs, and meanwhile, the heater protection module judges the abnormal condition of the heater through the logic operation circuit and increases fault protection control of the heater.
Description
Technical Field
The utility model relates to the technical field of fault protection, in particular to a heater fault protection circuit.
Background
The heater is an electric appliance which utilizes electric energy to achieve a heating effect, converts the electric energy into heat energy for use, can be used in electric equipment such as a water heater, an air conditioner and an electric blanket, and can adopt a fault protection circuit to carry out fault protection for ensuring the safety of the heater, the existing fault protection circuit of the heater mostly depends on a singlechip or a programmable logic device and other circuits to finish temperature detection, current detection and fault protection of the heater, the design cost is higher, the risk of software running is present, and whether the heater is in fault or not can not be accurately known, so that the heater needs to be improved.
Disclosure of Invention
The embodiment of the utility model provides a heater fault protection circuit for solving the problems in the background technology.
According to an embodiment of the present utility model, there is provided a heater fail-safe circuit including: the device comprises a power supply module, a temperature control module, a heater isolation control module, an overcurrent detection module, an overcurrent protection module and a heater protection module;
the power module is used for carrying out voltage reduction, rectification and filtering treatment on the input alternating current and outputting direct current;
the temperature control module is connected with the power supply module and is used for receiving the direct current and controlling the time base circuit to output a control signal through the thermal sensing circuit and the potentiometer circuit;
the heater isolation control module is connected with the temperature control module, is used for isolating and transmitting the control signal and triggering the work of the silicon controlled rectifier circuit, and is used for controlling the working state of the heater through the silicon controlled rectifier circuit;
the overcurrent detection module is connected with the heater isolation control module and is used for sampling the working current of the heater through the current sampling circuit, amplifying and overcurrent detecting the sampled current signal and outputting an overcurrent signal;
the overcurrent protection module is connected with the power supply module, the temperature control module and the overcurrent detection module, and is used for controlling the self-locking of the triode self-locking circuit through the overcurrent signal and controlling the working state of the time base circuit;
the heater protection module is connected with the power module, the temperature control module, the heater isolation control module and the overcurrent detection module, and is used for triggering the work of the logic operation circuit and the relay circuit through the overcurrent signals and the control signals and controlling the working state of the heater isolation control module through the relay circuit.
Compared with the prior art, the utility model has the beneficial effects that: the temperature control module detects the temperature of the heater, the potentiometer circuit is used for adjusting the upper limit and the lower limit of the temperature, the constant temperature control of the temperature is realized, meanwhile, when the temperature is too high, the working of the heater is stopped, the overcurrent detection module is used for detecting and judging the current of the working heater, overcurrent protection control of the heater is realized when the overcurrent occurs, and meanwhile, the heater protection module is used for judging whether abnormal heating of the heater is caused by the fault of the heater or not through the logic operation circuit, and then the fault protection control of the heater is increased.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments of the present utility model will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic block diagram of a heater fault protection circuit according to an embodiment of the present utility model.
Fig. 2 is a circuit diagram of a heater fault protection circuit provided by an example of the present utility model.
Fig. 3 is a circuit diagram of a connection of an overcurrent protection module according to an embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
specifically, the power module 1 is configured to step down, rectify and filter the input ac power and output dc power;
the temperature control module 2 is connected with the power supply module 1 and is used for receiving the direct current and controlling the time base circuit to output a control signal through the thermal sensing circuit and the potentiometer circuit;
the heater isolation control module 3 is connected with the temperature control module 2, is used for isolating and transmitting the control signals and triggering the work of the silicon controlled rectifier circuit, and is used for controlling the working state of the heater through the silicon controlled rectifier circuit;
the overcurrent detection module 4 is connected with the heater isolation control module 3 and is used for sampling the working current of the heater through a current sampling circuit, amplifying and overcurrent detecting the sampled current signal and outputting an overcurrent signal;
the overcurrent protection module 5 is connected with the power module 1, the temperature control module 2 and the overcurrent detection module 4, and is used for controlling the self-locking of the triode self-locking circuit through the overcurrent signal and controlling the working state of the time base circuit;
and the heater protection module 6 is connected with the power module 1, the temperature control module 2, the heater isolation control module 3 and the overcurrent detection module 4, and is used for triggering the work of the logic operation circuit and the relay circuit through the overcurrent signals and the control signals and controlling the working state of the heater isolation control module 3 through the relay circuit.
In a specific embodiment, the power module 1 may use a voltage conversion circuit and a filtering circuit to convert the input ac power into dc power and perform filtering processing; the temperature control module 2 can adopt a thermal sensing circuit, a potentiometer circuit and a time base circuit, the thermal sensing circuit detects the temperature and the potentiometer circuit adjusts the upper limit temperature value and the lower limit temperature value so as to trigger the time base circuit to control the heater isolation control module 3 to work; the heater isolation control module 3 can adopt an isolation driving circuit and a controllable silicon circuit, and the isolation driving circuit is used for carrying out signal transmission and controlling the work of the controllable silicon circuit so as to control the work of the heater; the overcurrent detection module 4 can adopt a current sampling circuit to sample current, and perform signal amplification and overcurrent judgment through an amplifying circuit and an overcurrent judgment circuit; the overcurrent protection module 5 can adopt a triode self-locking circuit and a triode switch circuit, and the triode self-locking circuit is used for controlling the switching-on and switching-off of the triode switch circuit in a self-locking way; the heater protection module 6 may employ a logic operation circuit and a relay circuit, and the logic operation circuit performs an and logic operation, and controls the operation of the relay circuit to control the power input to the heater.
specifically, the alternating current source is connected with the primary winding of the first transformer W1, the first end and the second end of the secondary winding of the first transformer W1 are respectively connected with the first end and the third end of the first rectifier T1, the fourth end of the first rectifier T1 is connected with one end of the thermistor NTC and the eighth end of the first controller U1 and is connected with the ground end through the first capacitor C1, the other end of the thermistor NTC is connected with one end of the first potentiometer RP1 and one end of the second potentiometer RP2, the sliding piece end of the first potentiometer RP1 and the sliding piece end of the second potentiometer RP2 are respectively connected with the second end and the sixth end of the first controller U1, the fifth end of the first controller U1 is connected with the first end of the first controller U1 through the second capacitor C2, the other end of the first potentiometer RP1, the other end of the second potentiometer RP2 and the ground end of the first controller U1 are connected with the overcurrent protection module 5, and the third end of the first controller U1 is connected with the heater 3 module.
In a specific embodiment, the thermistor NTC may be a negative temperature coefficient thermistor NTC; the first potentiometer RP1 is used for adjusting the lower temperature limit, and the second potentiometer RP2 is used for adjusting the upper temperature limit; the first controller U1 may be an NE555 integrated circuit, and changes the output signal according to the resistance change of the second end and the sixth end.
Further, the heater isolation control module 3 includes a first optocoupler U2, a second resistor R2, a third resistor R3, a third capacitor C3, a fourth resistor R4, a first transistor SCR, a heater, a sixth resistor R6, and a fourth capacitor C4;
specifically, the first end of the first optocoupler U2 is connected to the third end of the first controller U1, the second end of the first optocoupler U2 is connected to the ground end through the second resistor R2, the third end of the first optocoupler U2 is connected to one end of the fourth resistor R4 and one end of the third capacitor C3 through the third resistor R3, the other end of the third resistor R3 and one end of the fourth capacitor C4 are both connected to the second end of the secondary winding of the first transformer W1, the other end of the fourth resistor R4, the first end of the heater and one end of the sixth resistor R6 are both connected to the heater protection module, the second end of the heater is connected to the first end of the first transistor SCR, the control end of the first transistor SCR is connected to the fourth end of the first optocoupler U2, the other end of the sixth resistor R6 is connected to the other end of the fourth capacitor C4, and the second end of the first transistor SCR is connected to the overcurrent detection module 4.
In a specific embodiment, the first optical coupler U2 may be an MOC3063 optical coupler for isolating transmission signals; the first transistor SCR can be a bidirectional thyristor and is driven and controlled by a first optocoupler U2; the sixth resistor R6 and the fourth capacitor C4 form a rc snubber circuit for performing overvoltage protection on the first transistor SCR.
Further, the overcurrent detection module 4 includes a fifth resistor R5, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a first operational amplifier OP1, a third potentiometer RP3, and a second diode D2;
specifically, one end of the fifth resistor R5 is connected to the second end of the first transistor SCR and is connected to the in-phase end of the first operational amplifier OP1 and one end of the tenth resistor R10 through the eighth resistor R8, the other end of the fifth resistor R5 is connected to the second end of the secondary winding of the first transformer W1 and is connected to the inverting end of the first operational amplifier OP1 and one end of the ninth resistor R9 through the seventh resistor R7, the other end of the tenth resistor R10 is grounded, the other end of the ninth resistor R9 is connected to the output end of the first operational amplifier OP1 and is connected to the sliding sheet end of the third potentiometer RP3 and the cathode of the second diode D2 through the third potentiometer RP3, and the anode of the second diode D2 is connected to the overcurrent protection module 5 and the heater protection module 6.
In a specific embodiment, the fifth resistor R5 is used as a current sampling resistor for sampling the operating current of the heater; the first operational amplifier OP1 may be an OP07 operational amplifier, and performs voltage conversion and amplification processing on the sampled current signal; the third potentiometer RP3 and the second diode D2 are used for performing an overcurrent determination.
Further, the heater protection module 6 includes a first resistor R1, an inverter U3, a logic chip U4, an eleventh resistor R11, a first switching tube VT1, a second switching tube VT2, a twelfth resistor R12, a thirteenth resistor R13, a first diode D1, a first relay K1, and a first relay switch K1-1;
specifically, one end of the first resistor R1 is connected to the third end of the first controller U1, the other end of the first resistor R1 is connected to the input end of the inverter U3, the output end of the inverter U3 is connected to the first end of the logic chip U4, the second end of the logic chip U4 is connected to the anode of the second diode D2, the output end of the logic chip U4 is connected to the base of the first switching tube VT1 through the eleventh resistor R11, the collector of the first switching tube VT1 is connected to the collector of the second switching tube VT2, one end of the first relay K1 and the anode of the first diode D1, and is connected to one end of the thirteenth resistor R13 and the base of the second switching tube VT2 through the twelfth resistor R12, the emitter of the second switching tube VT2, the emitter of the first switching tube VT1 and the other end of the thirteenth resistor R13 are all grounded, the other end of the first relay K1 and the cathode of the first diode D1 are all connected to the first end of the first rectifier T1, and the first relay K1 and the first end of the first winding W of the first side of the first relay W1 are connected to the first end of the first winding W1 respectively.
In a specific embodiment, the inverter U3 is configured to detect that the input level signal is inverted, and a specific model is not limited; the logic chip U4 can be selected from the logic chip U4, and the output is high level only when the input is high level; the first switching tube VT1 and the second switching tube VT2 can be NPN type triodes; the first relay switch K1-1 can be a normally closed contact, and is controlled by the first relay K1.
Further, the overcurrent protection module 5 includes a fourth diode D4, a nineteenth resistor R19, an eighteenth resistor R18, a twentieth resistor R20, a sixth switching tube VT6, a seventeenth resistor R17, a fifth switching tube VT5, a sixteenth resistor R16, and a third diode D3;
specifically, the anode of the fourth diode D4 is connected to the anode of the second diode D2, the cathode of the fourth diode D4 is connected to the base of the sixth switching tube VT6 through a nineteenth resistor R19, one end of an eighteenth resistor R18 and one end of a twentieth resistor R20, the other end of the eighteenth resistor R18 is connected to the anode of the third diode D3 and the collector of the fifth switching tube VT5, the collector of the sixth switching tube VT6 is connected to the base of the fifth switching tube VT5 and one end of a sixteenth resistor R16 through a seventeenth resistor R17, the other end of the sixteenth resistor R16 and the emitter of the fifth switching tube VT5 are both connected to the fourth end of the first rectifier T1, and the emitter of the sixth switching tube VT6 and the other end of the twentieth resistor R20 are both grounded.
The overcurrent protection module 5 further comprises a fourth switching tube VT4, a fifteenth resistor R15, a fourteenth resistor R14 and a third switching tube VT3;
specifically, the base of the fourth switching tube VT4 is connected to the cathode of the third diode D3, the emitter of the fourth switching tube VT4 is connected to the ground, the collector of the fourth switching tube VT4 is connected to one end of the fourteenth resistor R14 and the base of the third switching tube VT3 through the fifteenth resistor R15, the collectors of the third switching tube VT3 and the fourteenth resistor R14 are both connected to the fourth end of the first rectifier T1, and the emitter of the third switching tube VT3 is connected to the fourth end of the first controller U1.
In a specific embodiment, the sixth switching tube VT6 may be an NPN type triode, the fifth switching tube VT5 may be a PNP type triode, which together form a triode self-locking circuit, to perform self-locking output on an input high level signal; the fourth switching tube VT4 and the third switching tube VT3 may be NPN type transistors, the fourth switching tube VT4 is configured to control the third switching tube VT3 to be turned off, and the third switching tube VT3 is configured to control the connection between the power module 1 and the temperature control module 2.
According to the heater fault protection circuit, voltage reduction, rectification and filtering treatment are carried out on alternating current input by an alternating current source through a first transformer W1, a first rectifier T1 and a first capacitor C1, electric energy is provided for a first controller U1, a lower limit temperature control and an upper limit temperature control of the heater are respectively set by a first potentiometer RP1 and a second potentiometer RP2, a heating temperature of the heater is detected by a thermistor NTC, the voltage of a second end and a sixth end input into the first controller U1 is changed, the first controller U1 controls a heater isolation control module 3 to work, specifically, when the temperature detected by the thermistor NTC exceeds an upper limit, the first controller U1 outputs a low level, when the temperature detected by the thermistor NTC is lower than a lower limit, the temperature detected by the heater is higher than the lower limit, the first controller U1 directly turns off the control of the heater, meanwhile, a first operational amplifier OP1 and a fifth resistor R5 conduct voltage change on to the second end and a sixth end, when a sampling current is continuously conducted by a first switch VT1 and a second switch VT2, and a first valve VT1 is continuously conducted, and a second valve VT1 is continuously conducted, and a current is continuously turned on when a first valve is continuously turned on and a second valve is continuously turned on, and a valve is continuously turned on.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (7)
1. A heater fault protection circuit is characterized in that,
the heater fault protection circuit includes: the device comprises a power supply module, a temperature control module, a heater isolation control module, an overcurrent detection module, an overcurrent protection module and a heater protection module;
the power module is used for carrying out voltage reduction, rectification and filtering treatment on the input alternating current and outputting direct current;
the temperature control module is connected with the power supply module and is used for receiving the direct current and controlling the time base circuit to output a control signal through the thermal sensing circuit and the potentiometer circuit;
the heater isolation control module is connected with the temperature control module, is used for isolating and transmitting the control signal and triggering the work of the silicon controlled rectifier circuit, and is used for controlling the working state of the heater through the silicon controlled rectifier circuit;
the overcurrent detection module is connected with the heater isolation control module and is used for sampling the working current of the heater through the current sampling circuit, amplifying and overcurrent detecting the sampled current signal and outputting an overcurrent signal;
the overcurrent protection module is connected with the power supply module, the temperature control module and the overcurrent detection module, and is used for controlling the self-locking of the triode self-locking circuit through the overcurrent signal and controlling the working state of the time base circuit;
the heater protection module is connected with the power module, the temperature control module, the heater isolation control module and the overcurrent detection module, and is used for triggering the work of the logic operation circuit and the relay circuit through the overcurrent signals and the control signals and controlling the working state of the heater isolation control module through the relay circuit.
2. The heater failsafe circuit of claim 1, wherein the power module comprises an ac source, a first transformer, a first rectifier, a first capacitor; the temperature control module comprises a thermistor, a first potentiometer, a second potentiometer, a first controller and a second capacitor;
the alternating current source is connected with a primary winding of the first transformer, a first end and a second end of a secondary winding of the first transformer are respectively connected with a first end and a third end of the first rectifier, a fourth end of the first rectifier is connected with one end of the thermistor and an eighth end of the first controller and is connected with a ground end through a first capacitor, the other end of the thermistor is connected with one end of the first potentiometer and one end of the second potentiometer, a sliding blade end of the first potentiometer and a sliding blade end of the second potentiometer are respectively connected with a second end and a sixth end of the first controller, a fifth end of the first controller is connected with the first end of the first controller, the other end of the first potentiometer, the other end of the second potentiometer and the ground end of the second potentiometer through a second capacitor, the fourth end of the first controller is connected with the overcurrent protection module, and the third end of the first controller is connected with the heater isolation control module.
3. The heater failsafe circuit of claim 2, wherein the heater isolation control module comprises a first optocoupler, a second resistor, a third capacitor, a fourth resistor, a first transistor, a heater, a sixth resistor, a fourth capacitor;
the first end of the first optocoupler is connected with the third end of the first controller, the second end of the first optocoupler is connected with the ground end through the second resistor, the third end of the first optocoupler is connected with one end of the fourth resistor and one end of the third capacitor through the third resistor, the other end of the third resistor and one end of the fourth capacitor are both connected with the second end of the secondary winding of the first transformer, the other end of the fourth resistor, the first end of the heater and one end of the sixth resistor are both connected with the heater protection module, the second end of the heater is connected with the first end of the first transistor, the control end of the first transistor is connected with the fourth end of the first optocoupler, the other end of the sixth resistor is connected with the other end of the fourth capacitor, and the second end of the first transistor is connected with the overcurrent detection module.
4. A heater failsafe circuit according to claim 3 wherein the over-current detection module comprises a fifth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first op-amp, a third potentiometer, a second diode;
one end of the fifth resistor is connected with the second end of the first transistor and connected with the same-phase end of the first operational amplifier and one end of the tenth resistor through the eighth resistor, the other end of the fifth resistor is connected with the second end of the secondary winding of the first transformer and connected with the reverse-phase end of the first operational amplifier and one end of the ninth resistor through the seventh resistor, the other end of the tenth resistor is grounded, the other end of the ninth resistor is connected with the output end of the first operational amplifier and connected with the sliding sheet end of the third potentiometer and the cathode of the second diode through the third potentiometer, and the anode of the second diode is connected with the overcurrent protection module and the heater protection module.
5. The heater fault protection circuit of claim 4, wherein the heater protection module comprises a first resistor, an inverter, a logic chip, an eleventh resistor, a first switch tube, a second switch tube, a twelfth resistor, a thirteenth resistor, a first diode, a first relay switch;
one end of the first resistor is connected with the third end of the first controller, the other end of the first resistor is connected with the input end of the inverter, the output end of the inverter is connected with the first end of the logic chip, the second end of the logic chip is connected with the anode of the second diode, the output end of the logic chip is connected with the base electrode of the first switch tube through the eleventh resistor, the collector electrode of the first switch tube is connected with the collector electrode of the second switch tube, one end of the first relay and the anode of the first diode and is connected with one end of the thirteenth resistor and the base electrode of the second switch tube through the twelfth resistor, the emitter of the second switch tube, the emitter of the first switch tube and the other end of the thirteenth resistor are grounded, the other end of the first relay and the cathode of the first diode are connected with the fourth end of the first rectifier, and the first end of the first relay switch are respectively connected with the first end of the secondary winding of the first transformer and the first end of the heater.
6. The heater failsafe circuit of claim 4 wherein the over-current protection module comprises a fourth diode, a nineteenth resistor, an eighteenth resistor, a twentieth resistor, a sixth switching tube, a seventeenth resistor, a fifth switching tube, a sixteenth resistor, a third diode;
the anode of the fourth diode is connected with the anode of the second diode, the cathode of the fourth diode is connected with the base electrode of the sixth switching tube, one end of the eighteenth resistor and one end of the twentieth resistor through a nineteenth resistor, the other end of the eighteenth resistor is connected with the anode of the third diode and the collector of the fifth switching tube, the collector of the sixth switching tube is connected with the base electrode of the fifth switching tube and one end of the sixteenth resistor through a seventeenth resistor, the other end of the sixteenth resistor and the emitter of the fifth switching tube are both connected with the fourth end of the first rectifier, and the emitter of the sixth switching tube and the other end of the twentieth resistor are both grounded.
7. The heater failsafe circuit of claim 6, wherein the over-current protection module further comprises a fourth switching tube, a fifteenth resistor, a fourteenth resistor, a third switching tube;
the base electrode of the fourth switching tube is connected with the cathode of the third diode, the emitter electrode of the fourth switching tube is connected with the ground end, the collector electrode of the fourth switching tube is connected with one end of the fourteenth resistor and the base electrode of the third switching tube through a fifteenth resistor, the collector electrode of the third switching tube and the other end of the fourteenth resistor are both connected with the fourth end of the first rectifier, and the emitter electrode of the third switching tube is connected with the fourth end of the first controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222824855.9U CN219227834U (en) | 2022-10-26 | 2022-10-26 | Heater fault protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222824855.9U CN219227834U (en) | 2022-10-26 | 2022-10-26 | Heater fault protection circuit |
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| Publication Number | Publication Date |
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| CN219227834U true CN219227834U (en) | 2023-06-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222824855.9U Active CN219227834U (en) | 2022-10-26 | 2022-10-26 | Heater fault protection circuit |
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| CN (1) | CN219227834U (en) |
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