CN216087034U - PTC constant temperature control and high temperature protection circuit of heating device - Google Patents
PTC constant temperature control and high temperature protection circuit of heating device Download PDFInfo
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- CN216087034U CN216087034U CN202122275842.6U CN202122275842U CN216087034U CN 216087034 U CN216087034 U CN 216087034U CN 202122275842 U CN202122275842 U CN 202122275842U CN 216087034 U CN216087034 U CN 216087034U
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Abstract
The utility model discloses a PTC constant temperature control and high temperature protection circuit of a heating device, and relates to a temperature control and overheating protection circuit of an electric heating device. Including central control circuit, temperature fuse F1, current fuse F2, zero point synchronization circuit, heater wire, PTC signal detection circuitry, high temperature protection circuit, the heater wire includes heater wire, PTC temperature-sensing silk and sets up the wall between heater wire and PTC temperature-sensing silk, the input of heater wire is connected with the zero line of external alternating current and is adopted the PTC signal implementation temperature detection of reflection temperature, and MCU has realized thermostatic control according to this signal control heater wire temperature. When the temperature of the heating wire is too high, the spacing layer melts to cause short circuit between the heating wire and the PTC temperature sensing wire in the spacing layer, the resistor R2/R3 is heated, and when the temperature value of the heating of the resistor reaches the disconnection temperature of the temperature fuse, the temperature fuse is disconnected, so that the input circuit of the whole control part circuit is disconnected, and the high-temperature protection of the whole circuit is realized.
Description
Technical Field
The utility model belongs to the technical field of electric heating devices, and particularly relates to a temperature control and overheating protection circuit for an electric heating device.
Background
The electric heating device realizes the functions of heating when the electric heating device is electrified and stopping heating when the electric heating device is not electrified, and the heating circuit is usually heated by utilizing the rise of the electrified temperature of a heating wire. In order to realize accurate control of the heating temperature and avoid spontaneous combustion and ignition of the heating device caused by continuous temperature rise of the heating wire, the temperature of the heating wire needs to be detected in real time in the heating process of the whole heating circuit, and the whole heating circuit needs to be automatically disconnected to avoid burning and causing fire of a user when the detected temperature is close to or reaches the highest temperature of the heating wire, so that a temperature control circuit and a high-temperature protection circuit need to be arranged in the heating circuit to realize temperature control of the heating wire and overheat protection of the heating device. However, in the current commonly used heating circuit with PTC signal, low voltage direct current detection is generally adopted, and in order to realize pure hardware high temperature protection, the current of the heating wire adopts alternating current half-wave, so that the current passing through the heating wire must be doubled to achieve the same power as full wave current. Therefore, the load loss is increased, the use cost is increased, and the potential safety hazard is increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a full-wave load circuit with a simple structure, so that the current used by electric heating devices with the same power is reduced, the cost is reduced, and the full-wave load circuit is safer and more reliable.
The technical scheme of the utility model is as follows: a PTC constant temperature control and high temperature protection circuit of a heating device is characterized in that the circuit comprises a central control circuit, a temperature fuse F1, a current fuse F2, a zero point synchronous circuit, a heating wire, a PTC signal detection circuit and a high temperature protection circuit, wherein the heating wire comprises a heating wire, a PTC temperature sensing wire and a spacing layer arranged between the heating wire and the PTC temperature sensing wire, one end of the heating wire is connected with external alternating current through the temperature fuse, the other end of the heating wire is connected with a first end of a bidirectional thyristor Q2, a second end of the bidirectional thyristor Q2 is connected with an external alternating current zero line, and a bidirectional thyristor drive circuit is connected with a control end of the bidirectional thyristor Q2 and is connected with the central control circuit; the input end of the PTC temperature sensing wire is connected with a low-voltage direct current circuit, the output end of the PTC temperature sensing wire is connected with a PTC signal detection circuit, the PTC signal detection circuit comprises a resistor R6, one end of the resistor R6 is connected with the PTC temperature sensing wire, and the other end of the resistor R2 is connected with a central control circuit; the output end of the PTC temperature sensing wire is also connected with a high-temperature protection circuit in parallel, the high-temperature protection circuit comprises a resistor R4, a voltage stabilizing diode D1, a bidirectional thyristor Q1, a resistor R2 and a resistor R3, one end of the resistor R2 is connected with a temperature fuse F1 after being connected with the resistor R3 in parallel, the first end of the bidirectional thyristor Q1 is connected with the other end of the resistor R1, the second end of the bidirectional thyristor Q1 is connected with an external alternating current zero line, the control end of the bidirectional thyristor Q1 is connected with the anode of the voltage stabilizing diode D1, and the cathode of the voltage stabilizing diode D1 is connected with the output end of the PTC temperature sensing wire; the resistor R2 and the resistor R3 are in close physical contact with the thermal fuse F1.
According to the PTC constant temperature control and high temperature protection circuit of the heating device, the output end of the PTC temperature sensing wire is connected with an external alternating current zero line.
In the PTC constant temperature control and high temperature protection circuit of the heating device, the control end of the triac Q1 is connected with the anode of the zener diode D1, and the resistor R4 is connected in series between the cathode of the zener diode D1 and the output end of the PTC temperature sensing wire.
In the PTC constant temperature control and high temperature protection circuit of the heating device, a resistor R7 is connected in series between the control end of the triac Q2 and the central control circuit.
Compared with the prior art, the utility model has the advantages that the low-voltage direct current is adopted to detect the temperature of the heating wire, and the current of the heating wire adopts full-wave alternating current, so that the use current of the electric heating device with the same power is reduced, the cost is reduced, and the electric heating device is safer and more reliable.
Drawings
Fig. 1 is a schematic circuit structure diagram of an embodiment of a PTC constant temperature control and high temperature protection circuit of a heat generating device according to the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments and the accompanying drawings, and it is to be understood that the described embodiments are some, but not all embodiments of the present invention.
Referring to fig. 1, a PTC constant temperature control and high temperature protection circuit 100 of a heating device according to an embodiment of the present invention includes a central control circuit 17, a temperature fuse F1, a current fuse F2, a zero synchronization circuit 10, a low voltage direct current 11, a heating wire 12, a PTC signal detection circuit 14, and a high temperature protection circuit 15, where the heating wire 12 includes a heating wire 121, a PTC temperature-sensing wire 122, and a spacer layer 123 disposed between the heating wire and the PTC temperature-sensing wire, one end of the heating wire 12 is connected to an external alternating current through the temperature fuse F1, the other end of the heating wire 12 is connected to a first end of a triac Q2, a second end of the triac Q2 is connected to an external alternating current zero line, and a triac Q2 driving circuit is connected to a control end of a triac Q2 and to the central control circuit; the PTC temperature sensing wire input end is connected with the low-voltage direct current circuit, and the PTC temperature sensing wire output end is connected with the PTC signal detection circuit, and this PTC signal detection circuit includes resistance R6, resistance R6 one end is connected with the PTC temperature sensing wire, resistance R6 other end is connected with central control circuit. When the temperature of the heating wire rises, the resistance value of the PTC heating wire is increased, the voltage of the PTC feedback signal is reduced, and the central control circuit 17 controls the temperature of the heating wire according to the signal so as to keep the temperature of the heating wire constant. Zero point synchronizing circuit 10 with external alternating current AC's zero line and central control circuit 17 connects for detect external alternating current AC's zero point signal and with zero point signal output extremely central control circuit 17, central control circuit 17 output control signal to bidirectional thyristor Q2 control end Gate in order to switch on when the current temperature that sampling voltage corresponds is less than preset temperature value and receives zero point signal bidirectional thyristor Q2 makes heater 121 not only can work when the positive half cycle of alternating current, also can work when the negative half cycle of alternating current, thereby realizes full wave work.
The output end of the PTC temperature sensing wire is also connected with a high-temperature protection circuit in parallel, the high-temperature protection circuit comprises a resistor R4, a voltage stabilizing diode D1, a bidirectional thyristor Q1, a resistor R2 and a resistor R3, one end of the resistor R2 is connected with a temperature fuse F1 after being connected with the resistor R3 in parallel, the first end of the bidirectional thyristor Q1 is connected with the other end of the resistor R1, the second end of the bidirectional thyristor Q1 is connected with an external alternating current zero line, the control end of the bidirectional thyristor Q1 is connected with the anode of the voltage stabilizing diode D1, and the cathode of the voltage stabilizing diode D1 is connected with the output end of the PTC temperature sensing wire; the resistor R2 and the resistor R3 are in close physical contact with the thermal fuse F1. Therefore, when the temperature is too high, the spacing layer 123 is melted to cause a short circuit between the heating wire 121 and the PTC temperature-sensing wire 122, so that the voltage-stabilizing diode D1 is broken down, the control end of the bidirectional thyristor Q1 is triggered, the bidirectional thyristor Q1 is turned on, the resistor R2 and the resistor R3 are heated to disconnect the temperature fuse F1, and therefore, the external alternating current AC is disconnected to achieve the effect of protecting the high temperature. In a further mode, the output end of the PTC temperature sensing wire is connected with an external alternating current zero line, so that the heating wire 121 and the PTC temperature sensing wire 122 can be more safely short-circuited when the spacer layer 123 is melted. In a further mode, the control end of the bidirectional triode thyristor Q1 is connected with the anode of the voltage stabilizing diode D1, and a resistor R4 is connected in series between the cathode of the voltage stabilizing diode D1 and the output end of the PTC temperature sensing wire. A resistor R7 is connected in series between the control end of the bidirectional thyristor Q2 and a central control circuit.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. A PTC constant temperature control and high temperature protection circuit of a heating device is characterized in that the circuit comprises a central control circuit, a temperature fuse F1, a current fuse F2, a zero point synchronous circuit, a heating wire, a PTC signal detection circuit and a high temperature protection circuit, wherein the heating wire comprises a heating wire, a PTC temperature sensing wire and a spacing layer arranged between the heating wire and the PTC temperature sensing wire, one end of the heating wire is connected with external alternating current through the temperature fuse, the other end of the heating wire is connected with a first end of a bidirectional thyristor Q2, a second end of the bidirectional thyristor Q2 is connected with an external alternating current zero line, and a bidirectional thyristor drive circuit is connected with a control end of the bidirectional thyristor Q2 and is connected with the central control circuit; the input end of the PTC temperature sensing wire is connected with a low-voltage direct current circuit, the output end of the PTC temperature sensing wire is connected with a PTC signal detection circuit, the PTC signal detection circuit comprises a resistor R6, one end of the resistor R6 is connected with the PTC temperature sensing wire, and the other end of the resistor R2 is connected with a central control circuit; the output end of the PTC temperature sensing wire is also connected with a high-temperature protection circuit in parallel, the high-temperature protection circuit comprises a resistor R4, a voltage stabilizing diode D1, a bidirectional thyristor Q1, a resistor R2 and a resistor R3, one end of the resistor R2 is connected with a temperature fuse F1 after being connected with the resistor R3 in parallel, the first end of the bidirectional thyristor Q1 is connected with the other end of the resistor R1, the second end of the bidirectional thyristor Q1 is connected with an external alternating current zero line, the control end of the bidirectional thyristor Q1 is connected with the anode of the voltage stabilizing diode D1, and the cathode of the voltage stabilizing diode D1 is connected with the output end of the PTC temperature sensing wire; the resistor R2 and the resistor R3 are in close physical contact with the thermal fuse F1.
2. A PTC thermostatic control and high temperature protection circuit for a heat generating device according to claim 1, wherein the output terminal of the PTC temperature-sensing wire is connected to an external ac neutral line.
3. A PTC thermostatic control and high temperature protection circuit for a heat generating device according to claim 2, wherein the control terminal of the triac Q1 is connected to the anode of the zener diode D1, and a resistor R4 is connected in series between the cathode of the zener diode D1 and the output terminal of the PTC temperature-sensing wire.
4. A PTC thermostatic control and high temperature protection circuit for a heat generating device according to claim 3, wherein a resistor R7 is connected in series between the control terminal of the triac Q2 and the central control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122275842.6U CN216087034U (en) | 2021-09-19 | 2021-09-19 | PTC constant temperature control and high temperature protection circuit of heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122275842.6U CN216087034U (en) | 2021-09-19 | 2021-09-19 | PTC constant temperature control and high temperature protection circuit of heating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216087034U true CN216087034U (en) | 2022-03-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122275842.6U Active CN216087034U (en) | 2021-09-19 | 2021-09-19 | PTC constant temperature control and high temperature protection circuit of heating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216087034U (en) |
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2021
- 2021-09-19 CN CN202122275842.6U patent/CN216087034U/en active Active
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