CN211792068U - Electric heating drive circuit with protection function - Google Patents
Electric heating drive circuit with protection function Download PDFInfo
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- CN211792068U CN211792068U CN202020760289.8U CN202020760289U CN211792068U CN 211792068 U CN211792068 U CN 211792068U CN 202020760289 U CN202020760289 U CN 202020760289U CN 211792068 U CN211792068 U CN 211792068U
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Abstract
The utility model relates to a drive circuit of heating class product, it discloses a take protect function's electrical heating drive circuit, when master control MCU broke down, the very first time closed electrical heating equipment, guarantee safety. The circuit comprises a main control MCU, a first triode, a second triode, first to fifth resistors and a first capacitor; the base electrode of the first triode is connected to the heating protection signal output end of the master control MCU through a first resistor and a first capacitor in sequence, the emitting electrode of the first triode is connected to the power supply of a heating signal, and the collecting electrode of the first triode is connected with the collecting electrode of the second triode through a third resistor; the base electrode of the second triode is connected to the heating control signal output end of the master control MCU through a fifth resistor, the emitting electrode of the second triode is grounded, and the collector electrode of the second triode is connected to the heating signal end of the electric heating equipment through a fourth resistor; the second resistor is connected between the base of the first triode and the power supply of the heating signal.
Description
Technical Field
The utility model relates to a drive circuit of heating type product, concretely relates to take protect function's electric heating drive circuit.
Background
With the development of electric heating technology, more and more household appliances with electric heating function are widely used. The safety problem of the electric heating equipment is firstly considered, and the main control MCUs adopted by electric heating products in the current market are uneven, so that how to close the heating signal at the first time when the main control MCUs break down is very important to prevent the safety problem caused by abnormal temperature of the electric heating equipment.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the electric heating driving circuit with the protection function is provided, when a master control MCU breaks down, the electric heating equipment is turned off at the first time, and safety is guaranteed.
The utility model provides a technical scheme that above-mentioned technical problem adopted is:
an electric heating driving circuit with a protection function comprises a main control MCU, a first triode, a second triode, first to fifth resistors and a first capacitor; the base electrode of the first triode is connected to the heating protection signal output end of the master control MCU through a first resistor and a first capacitor in sequence, the emitting electrode of the first triode is connected to the power supply of a heating signal, and the collecting electrode of the first triode is connected with the collecting electrode of the second triode through a third resistor; the base electrode of the second triode is connected to the heating control signal output end of the master control MCU through a fifth resistor, the emitting electrode of the second triode is grounded, and the collector electrode of the second triode is connected to the heating signal end of the electric heating equipment through a fourth resistor; the second resistor is connected between the base of the first triode and the power supply of the heating signal.
Preferably, the circuit further comprises a second capacitor connected between the collector of the first transistor and ground.
As a further optimization, the first triode is a PNP triode, and the second triode is an NPN triode.
The utility model has the advantages that:
based on the designed electric heating driving circuit, when the main control MCU works normally, the output signal can enable the first triode to be conducted, so that the heating control signal can obtain power supply, and the heating equipment is controlled normally; when the master control MCU is abnormal, the output signal can not lead the first triode to be conducted, thereby closing the power supply of the heating control signal, closing the electric heating equipment at the first time and ensuring the safety. The circuit has the advantages of simple operation, low cost, stable effect and the like.
Drawings
FIG. 1 is a block diagram of an electric heating driving circuit with protection function in an embodiment;
in the figure, C1 is a first capacitor, C2 is a second capacitor, Q1 is a first transistor, Q2 is a second transistor, and R1 to R5 are first to second resistors, respectively.
Detailed Description
The utility model aims at providing a take protect function's electrical heating drive circuit, when master control MCU broke down, the very first time closed electrical heating equipment, guarantee safety. The core idea is as follows: the protection control signal circuit is introduced to the power supply part of the heating control signal, when the master control MCU normally works, the output heating protection signal is a PWM square wave signal, the first triode can be opened based on the blocking AC characteristic of the capacitor, so that the circuit of the heating control signal can be normally operated by power, when the master control MCU is abnormal, the first triode can not be opened through the capacitor by the high level or the low level continuously output, the circuit of the heating control signal can not be powered, and the electric heating equipment is closed.
Example (b):
taking the driving of a PTC (positive temperature coefficient) heating device as an example, the driving circuit in this embodiment is shown in fig. 1, and includes: the main control MCU comprises a main control MCU, a first triode Q1, a second triode Q2, first to fifth resistors R1-R5, a first capacitor C1 and a second capacitor C2; the base electrode of the first triode Q1 is connected to the heating protection signal output end of the main control MCU through a first resistor R1 and a first capacitor C1 in sequence, the emitting electrode is connected to a power supply VCC of a heating signal, and the collecting electrode is connected with the collecting electrode of the second triode Q2 through a third resistor R3; the base electrode of the second triode Q2 is connected to the heating control signal output end of the main control MCU through a fifth resistor R5, the emitting electrode is grounded, and the collector electrode is connected to the heating signal end of the PTC electric heating equipment through a fourth resistor R4; the second resistor R2 is connected between the base of the first transistor Q1 and the power supply VCC of the heating signal. The second capacitor C2 is connected between the collector of the first transistor Q1 and ground.
The working principle of the driving circuit is as follows:
to turn on the PTC heating control signal, the main control system MCU must provide the electric heating control signal and the heating protection signal, and simultaneously control the first transistor Q1 and the second transistor Q2.
When the main control system MCU normally works, the heating protection signal is a PWM square wave, which is equivalent to simulating an 'alternating current' signal, the characteristic that the capacitor can only isolate direct current through alternating current is utilized, so that the heating protection signal can reach the trigger end of the first triode Q1, when the heating protection signal is at the low level of the PWM, the Q1 triode is conducted, the VCC signal reaches the collector electrode of the second triode Q2, the heating control signal of the MCU is utilized to control the triode Q2 to adjust the state of the PTC heating signal, thereby normally controlling the work of the PTC electric heating equipment.
When the main control system MCU is abnormal, or continuously outputs a high level or continuously outputs a low level, when the heating protection signal output by the MCU is continuously high, the signal cannot reach the trigger electrode of the first triode Q1 through the first capacitor C1 by the first triode Q1, because the trigger electrode is pulled to be high by the pull-up resistor R2, the first triode Q1 cannot be switched on, the VCC cannot reach the second triode Q2, and the PTC heating signal cannot be output to control the PTC electric heating equipment; similarly, when the heating protection signal output by the MCU is continuously at a low level, the first triode Q1 is also turned off, so as to cut off the power supply for the heating control signal and protect the PTC device.
By means of the method, the PTC electric heating equipment can be turned off at the first time when the MCU of the main control system is abnormal, and therefore the safety of the equipment is guaranteed. In the above circuit, the second capacitor C2 is mainly used to filter VCC after passing through the first transistor Q1, so that VCC becomes a smooth level signal.
The above description is only exemplary of the present invention and should not be taken as limiting, and all changes, equivalents, and improvements made within the spirit and principles of the present invention should be understood as being included in the scope of the present invention.
Claims (3)
1. An electric heating drive circuit with a protection function is characterized in that,
the circuit comprises a main control MCU, a first triode (Q1), a second triode (Q2), first to fifth resistors (R1-R5) and a first capacitor (C1); the base electrode of the first triode (Q1) is connected to the heating protection signal output end of the main control MCU through a first resistor (R1) and a first capacitor (C1) in sequence, the emitter electrode of the first triode is connected to the power supply of a heating signal, and the collector electrode of the first triode (Q1) is connected to the collector electrode of the second triode (Q2) through a third resistor (R3); the base electrode of the second triode (Q2) is connected to the heating control signal output end of the main control MCU through a fifth resistor (R5), the emitter electrode of the second triode is grounded, and the collector electrode of the second triode is connected to the heating signal end of the electric heating equipment through a fourth resistor (R4); the second resistor (R2) is connected between the base of the first transistor (Q1) and the power supply of the heating signal.
2. The electric heating drive circuit with protection function according to claim 1,
the circuit further includes a second capacitor (C2), the second capacitor (C2) being connected between the collector of the first transistor (Q1) and ground.
3. An electric heating drive circuit with protection function according to claim 1 or 2,
the first triode (Q1) is a PNP triode and the second triode (Q2) is an NPN triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020760289.8U CN211792068U (en) | 2020-05-09 | 2020-05-09 | Electric heating drive circuit with protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020760289.8U CN211792068U (en) | 2020-05-09 | 2020-05-09 | Electric heating drive circuit with protection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211792068U true CN211792068U (en) | 2020-10-27 |
Family
ID=72957612
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020760289.8U Active CN211792068U (en) | 2020-05-09 | 2020-05-09 | Electric heating drive circuit with protection function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211792068U (en) |
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2020
- 2020-05-09 CN CN202020760289.8U patent/CN211792068U/en active Active
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