CN115864302A - Heating protection circuit, heating device and protection method - Google Patents
Heating protection circuit, heating device and protection method Download PDFInfo
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- CN115864302A CN115864302A CN202310068446.7A CN202310068446A CN115864302A CN 115864302 A CN115864302 A CN 115864302A CN 202310068446 A CN202310068446 A CN 202310068446A CN 115864302 A CN115864302 A CN 115864302A
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Abstract
The invention discloses a heating protection circuit, a heating device and a protection method. One end of the current sampling resistor is connected with the drain electrode of the power tube. One end of the temperature sampling resistor is connected with the other end of the current sampling resistor, the other end of the temperature sampling resistor is grounded, and the temperature sampling resistor is attached to the power tube. The control module is used for controlling the power tube to be opened and closed, acquiring a sampling voltage signal responding to the temperature and the current of the power tube through the first port, and closing the power tube when the sampling voltage signal is abnormal. This application only needs to set up single port for sampling circuit and can realize the control and the protection to the power tube through setting gradually current sampling resistance and temperature sampling resistance at the drain electrode of power tube, has saved MCU's software and hardware resource, makes MCU's lectotype more nimble.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a heating protection circuit, a heating device and a protection method.
Background
At present, a heating device in the market often adopts a power tube to drive a heating element to generate heat. Because the power tube can appear overflowing or the abnormal condition of excess temperature in the course of working for the power tube damages, thereby makes whole heating device can't normally work, consequently, needs protect the power tube.
In a heating protection circuit in the prior art, a current sampling circuit and a temperature sampling circuit are respectively arranged for the current and the temperature of a power tube, an MCU (micro controller Unit) is arranged to respectively receive feedback signals of the two sampling circuits, and then the power tube is controlled according to the current condition and the temperature condition of the feedback signals. The MCU needs to be provided with an independent current detection port and an independent temperature detection port corresponding to the current sampling circuit and the temperature sampling circuit respectively. Therefore, the heating protection circuit in the prior art needs to occupy two MUC ports, and the MCU needs to detect the voltages of the two detection ports in a time-sharing manner, so that the heating protection circuit in the prior art occupies more resources of the MCU.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: a heating protection circuit, a heating device and a protection method are provided.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a thermal protection circuit comprising:
the source electrode of the power tube is used for being connected with a power supply;
one end of the current sampling resistor is connected with the drain electrode of the power tube;
one end of the temperature sampling resistor is connected with the other end of the current sampling resistor, the other end of the temperature sampling resistor is grounded, and the temperature sampling resistor is attached to the power tube; and
control module, control module connects the grid of power tube, control module is provided with first port, first port is connected respectively the other end of current sampling resistance and the one end of temperature sampling resistance, control module is used for control opening and closing of power tube, through first port acquires the response the sampled voltage signal of power tube temperature and electric current, and is in the sampled voltage signal closes when unusual the power tube.
Further, the control module includes:
a reference unit for providing a reference voltage signal;
the comparison unit is connected with the reference unit, is respectively connected with the current sampling resistor and the temperature sampling resistor through the first port, and is used for acquiring the reference voltage signal and the sampling voltage signal, comparing the reference voltage signal and the sampling voltage signal, and outputting a feedback signal according to a comparison result; and
and the control unit is respectively connected with the comparison unit and the grid electrode of the power tube and is used for controlling the power tube to be switched on and off, acquiring the feedback signal and responding to the feedback signal to switch off the power tube when the sampling voltage signal is abnormal.
Furthermore, the power tube is arranged outside the control module, the control module is provided with a second port, and the control unit is connected with the grid electrode of the power tube through the second port.
Furthermore, the power tube is integrated inside the control module, the control module is provided with a third port, and a drain electrode of the power tube is connected to one end of the current sampling resistor through the third port.
Further, the comparison unit includes a comparator, the positive input end of the comparator is connected with the current sampling resistor and the temperature sampling resistor through the first port, the negative input end of the comparator is connected with the reference unit, and the output end of the comparator is connected with the control unit.
Further, the reference unit includes a first resistor and a second resistor;
one end of the first resistor is used for connecting a power supply, and the other end of the first resistor is connected with the negative input end of the comparator;
one end of the second resistor is connected with the other end of the first resistor, and the other end of the second resistor is grounded.
Furthermore, the control module is further provided with a fourth port and a fifth port, the control unit is respectively connected with the fourth port and the fifth port, and the control unit is used for receiving an enable signal through the fourth port, responding to the enable signal, controlling the power tube to be opened and closed, and outputting a protection signal through the fifth port when the sampling voltage signal is abnormal.
A heating device comprises a heating body and the heating protection circuit, wherein one end of the heating body is connected with a drain electrode of a power tube in the heating protection circuit, and the other end of the heating body is grounded.
A method of protection comprising the steps of:
providing an enabling signal and driving a power tube according to the enabling signal;
acquiring a sampling voltage signal responding to the temperature and the current of the power tube;
providing a reference voltage signal and comparing the reference voltage signal with the sampled voltage signal;
when the sampling voltage signal is greater than the reference voltage signal, enabling the power tube to be kept in an opening state;
and when the sampling voltage signal is smaller than the reference voltage signal, performing overcurrent and overtemperature protection on the power tube.
Further, when the sampling voltage signal is smaller than the reference voltage signal, the step of performing overcurrent and overtemperature protection on the power tube includes:
providing a counter and initializing a count value;
when the sampling voltage signal is smaller than the reference voltage signal, adding 1 to a count value, and judging whether the count value reaches a preset count threshold value;
when the counting value does not reach the preset counting threshold value, closing the power tube, opening the power tube again after preset time, and re-comparing the current sampling voltage signal with the reference voltage signal;
and when the counting value reaches the preset counting threshold value, continuously closing the power tube.
The invention has the beneficial effects that: this application is through setting up current sampling resistance and the temperature sampling resistance who establishes ties with the power tube to setting up opening and closing of control module control power tube, control module is provided with single independent first port, and first port is connected between current sampling resistance and temperature sampling resistance, and control module can acquire the electric current and the temperature condition of power tube through the voltage that detects first port, realizes the control to the power tube. When the detected sampling voltage signal of the first port is abnormal, the control module closes the power tube to stop the power tube, so that the power tube is protected.
Drawings
FIG. 1 is a schematic diagram of a prior art thermal protection circuit;
FIG. 2 is a first schematic diagram of a thermal protection circuit according to an embodiment of the present invention;
FIG. 3 is a second schematic diagram of a thermal protection circuit according to an embodiment of the present invention;
FIG. 4 is a first flowchart of a protection method according to a second embodiment of the present invention;
FIG. 5 is a second flow chart of the protection method according to the second embodiment of the present invention;
fig. 6 is a schematic diagram of a working flow of the thermal protection circuit according to an embodiment of the present invention.
Description of reference numerals:
100. a control module; 110. a control unit; 120. a comparison unit; 121. a comparator; 130. a reference unit.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1, taking a PMOS power tube M1 as an example, in the prior art, an MCU of a heating protection circuit is provided with a current detection port and a temperature detection port, and a current detection port OC detects a current of the power tube M1 to realize overcurrent protection of the power tube M1; the temperature detection port OT detects the temperature of the power tube M1, and the over-temperature protection of the power tube M1 is realized. It can be seen that, prior art's heating protection circuit's MCU has set up two detection ports, and MCU needs timesharing to detect current detection port and temperature detection port, has greatly occupied MUC's resource, and in addition, prior art's heating protection circuit need add divider resistance R4 and R5 respectively at current sampling circuit and temperature sampling circuit for the cost of whole circuit is higher.
Example one
Referring to fig. 2 to 3, the present embodiment provides a heating protection circuit applied to a heating device for performing over-current and over-temperature protection on a power tube M1 controlling a heating element such as a heating element H1.
Referring to fig. 2 and 3, the heating protection circuit includes a power tube M1, a current sampling resistor R3, a temperature sampling resistor RT, and a control module 100. And the source electrode of the power tube M1 is used for connecting a power supply. One end of the current sampling resistor R3 is connected with the drain electrode of the power tube M1. One end of the temperature sampling resistor RT is connected with the other end of the current sampling resistor R3, the other end of the temperature sampling resistor RT is grounded, and the temperature sampling resistor RT is attached to the power tube M1. The control module 100 is connected to the gate of the power transistor M1, the control module 100 is provided with a first port FB, the first port FB is connected to the other end of the current sampling resistor R3 and one end of the temperature sampling resistor RT, the control module 100 is configured to control the power transistor M1 to be turned on and off, obtain a sampling voltage signal VFB responding to the temperature and the current of the power transistor M1 through the first port FB, and turn off the power transistor M1 when the sampling voltage signal VFB is abnormal. The control module 100 in this embodiment is a part of a functional circuit in an MCU, and the MCU may adopt an existing controller or a customized integrated controller, which is not limited herein. Illustratively, one end of the heating element H1 is connected to the drain of the power tube M1, and the other end of the heating element H1 is grounded.
The working principle of the heating protection circuit in the embodiment is as follows: taking the PMOS power transistor M1 as an example, the control module 100 is connected to the gate of the power transistor M1, and the gate voltage of the power transistor M1 is adjusted to turn on or off the power transistor M1. The current sampling resistor R3 and the temperature sampling resistor RT are sequentially connected in series to the drain of the power tube M1, and the first port FB of the control module 100 is connected to the current sampling resistor R3 and the temperature sampling resistor RT, respectively. When the current of the power tube M1 is too high or the temperature is too high, the voltage of the first port FB is changed, that is, the sampled voltage signal VFB is abnormal. The control module 100 turns off the power tube M1 in response to the voltage variation of the first port FB, and stops the heating operation of the heating circuit.
It can be understood that, in the heating protection circuit of this embodiment, the control module 100 can monitor and protect the power tube M1 only by setting a single port for the sampling circuit, so that the resource occupation of the control module 100 is reduced, and the MCU is more flexible in type selection. In addition, compared with a heating protection circuit in the prior art, the heating protection circuit has the advantages that the arrangement of two resistors is reduced, and the cost of the whole circuit is reduced.
Illustratively, the control module 100 and the source of the power tube M1 are connected to the same power source, and the other end of the temperature sampling resistor RT and the control module 100 are commonly grounded. The temperature sampling resistor RT is a negative temperature coefficient resistor and needs to be arranged close to the power tube M1.
Specifically, the control module 100 includes a reference unit 130, a comparison unit 120, and a control unit 110. The reference unit 130 is configured to provide a reference voltage signal V1. The comparing unit 120 is connected to the reference unit 130, and is connected to the current sampling resistor R3 and the temperature sampling resistor RT through the first port FB, respectively, and is configured to obtain the reference voltage signal V1 and the sampling voltage signal VFB, compare the reference voltage signal V1 and the sampling voltage signal VFB, and output a feedback signal according to a comparison result. The control unit 110 is respectively connected to the comparing unit 120 and the gate of the power tube M1, and is configured to control the power tube M1 to be turned on and off, obtain the feedback signal, and respond to the feedback signal to turn off the power tube M1 when the sampling voltage signal VFB is abnormal.
It can be understood that in the control module 100 of the present embodiment, the control unit 110 controls the gate voltage of the power transistor M1, so as to turn on or off the power transistor M1. The comparing unit 120 is respectively connected to the current sampling resistor R3 and the temperature sampling resistor RT through the first port FB to obtain a sampling voltage signal VFB; the comparison unit 120 also obtains the reference voltage signal V1 provided by the reference unit 130, compares the sampled voltage signal VFB with the reference voltage signal V1, and outputs the feedback signal value control unit 110 according to the comparison result. The control unit 110 obtains the feedback signal, and determines whether to turn off the power tube M1 in the heating state according to the state of the feedback signal. Illustratively, when the current of the power tube M1 is too large, the voltage of the first port FB changes, the feedback signal output by the comparing unit 120 also changes, and the control unit 110 determines that the current of the power tube M1 is abnormal according to the feedback signal and timely turns off the power tube M1, thereby protecting the power tube M1 from being damaged.
Referring to fig. 2, in the present embodiment, the power transistor M1 is disposed outside the control module 100, the control module 100 is disposed with a second port CT, and the control unit 110 is connected to the gate of the power transistor M1 through the second port CT. It can be understood that the power tube M1 of the present embodiment is disposed outside the control module 100 and electrically connected to the control module 100 through the second port CT.
Referring to fig. 3, in some other embodiments, the power transistor M1 is integrated inside the control module 100, the control module 100 is provided with a third port PO, and a drain of the power transistor M1 is connected to one end of the current sampling resistor R3 through the third port PO. It can be understood that the power transistor M1 is integrated in the control module 100, so as to control the external devices of the module 100, and to contribute to further miniaturizing the overall structure of the heating protection circuit.
Specifically, the comparing unit 120 includes a comparator 121, a positive input end of the comparator 121 is connected to the current sampling resistor R3 and the temperature sampling resistor RT through the first port FB, a negative input end of the comparator 121 is connected to the reference unit 130, and an output end of the comparator 121 is connected to the control unit 110.
It can be understood that, in this embodiment, the positive input terminal of the comparator 121 obtains a sampled voltage signal through the current sampling resistor R3 and the temperature sampling resistor RT, compares the sampled voltage signal VFB with the reference voltage signal V1, and provides a feedback signal to the control unit 110 according to the comparison result.
Specifically, the reference unit 130 includes a first resistor R1 and a second resistor R2. One end of the first resistor R1 is used for connecting a power supply, and the other end of the first resistor R1 is connected to the negative input end of the comparator 121. One end of the second resistor R2 is connected with the other end of the first resistor R1, and the other end of the second resistor R2 is grounded.
In this embodiment, the first resistor R1 and the second resistor R2 perform voltage division in the reference unit 130, and the output voltage of the power supply is divided by the first resistor R1 and the second resistor R2 to obtain a reference voltage, which is output to the negative input terminal of the comparator 121. The second resistor R2 may be a resistance device with a variable resistance value, or may be a resistor with a different resistance value, so as to adapt to heating devices of different power tubes M1 or different heating elements H1.
Optionally, the control module 100 is further provided with a fourth port EN and a fifth port PT, the control unit 110 is connected to the fourth port EN and the fifth port PT, and the control unit 110 is configured to receive an enable signal through the fourth port EN, and respond to the enable signal to control the power tube M1 to be turned on and off, and to output a protection signal through the fifth port PT when the sampling voltage signal VFB is abnormal.
It is understood that the fourth port EN is an input port, the fifth port PT is an output port, and the control module 100 is connected to other functional circuits or modules of the MCU through the fourth port EN and the fifth port PT. The control module 100 of this embodiment obtains an enable signal output by the front stage circuit through the fourth port EN, and controls the power tube M1 to be turned on and off in response to the enable signal; the control module 100 outputs a protection signal to the post-stage circuit through the fifth port PT when the sampled voltage signal VFB is abnormal, that is, when the power tube M1 is abnormal due to overcurrent or over-temperature.
The heating protection circuit works if the enable signal is valid, and the heating protection circuit is closed if the enable signal is invalid; the protection signal is invalid when the circuit is in the closed state and the heating state, and the protection signal is valid when the circuit is in the protection state.
In the heating protection circuit of the embodiment, the power tube M1 is used for switching on or off the path of the heating element H1, and when the power tube M1 is turned on, the heating element H1 is connected to the loop and heats; and when the power tube M1 is closed, the loop where the heating element H1 is located is disconnected, so that the product stops heating.
The heating protection circuit of the present embodiment is provided with three states:
in the off state, the enable signal is invalid, the control module 100 turns off the power tube M1 through the second port CT, and disconnects the loop where the heating element H1 is located, the heating device does not heat, and the protection signal is invalid.
In the heating state, the enable signal is valid, the sampling voltage signal VFB is greater than or equal to the reference voltage signal V1, the control module 100 turns on the power tube M1 through the second port CT, so that the heating element H1 is connected to the loop and is heated, and the protection signal is invalid at this time. In the heating state, the control module 100 monitors the current and temperature conditions of the power tube M1 through the first port FB.
In the protection state, the enable signal is valid, the sampling voltage signal VFB is smaller than the reference voltage signal V1, and the control module 100 closes the power tube M1 through the second port CT, so that the loop where the heating element H1 is located is disconnected to stop heating, and at this time, the protection signal is valid. In the protection state, the power tube M1 is turned off, the voltage of the first port FB no longer reflects the current and temperature conditions of the power tube M1, and the control unit 110 no longer processes the feedback signal sent by the comparator 121.
Further, when the power transistor M1 is turned on, the value of the sampled voltage signal VFB is as shown in the following formula:
the VSD is the source-drain voltage of the power tube M1. As the current of the power tube M1 increases, VSD increases; the temperature of the power tube M1 rises, and the resistance value of the temperature sampling resistor RT is reduced, so that when the VSD is increased or the temperature sampling resistor RT is reduced to a certain value, the sampling voltage signal VFB can be smaller than the reference voltage signal V1, and the circuit enters a protection state.
Example two
The embodiment provides a heating device, which comprises a heating element H1 and a heating protection circuit as in the first embodiment, wherein one end of the heating element H1 is connected to a drain electrode of the power tube M1 in the heating protection circuit, and the other end of the heating element H1 is grounded.
For example, the heating device may be an electronic cigarette or other electronic product or a household appliance, which is not limited herein.
EXAMPLE III
Referring to fig. 4 to 6, the present embodiment provides a protection method applied to the heating protection circuit in the first embodiment.
Referring to fig. 4, the protection method includes the steps of:
s10, providing an enable signal, and driving a power tube according to the enable signal;
in the step, the heating protection circuit is powered on, whether the enabling signal is effective or not is detected, and if the enabling signal is ineffective, the heating protection circuit enters a closed state; if the voltage is effective, the heating state is entered.
S20, acquiring a sampling voltage signal responding to the temperature and the current of the power tube;
in the step, under the heating state, a sampling voltage signal is obtained through the current sampling resistor and the temperature sampling resistor.
S30, providing a reference voltage signal, and comparing the reference voltage signal with the sampling voltage signal;
in this step, the reference voltage signal is compared with the sampling voltage, and the corresponding step is executed according to the comparison result.
S40, when the sampling voltage signal is larger than the reference voltage signal, enabling the power tube to be kept in an opening state;
in the step, the power tube is started, the heating element is connected to the loop and is heated, and the heating protection circuit is in a heating state.
And S50, when the sampling voltage signal is smaller than the reference voltage signal, performing overcurrent and overtemperature protection on the power tube.
In the step, the power tube is closed, the heating body is disconnected from the loop, heating is stopped, and the heating protection circuit is in a closed state.
Referring to fig. 5, step S50 includes:
s51, providing a counter and initializing a count value;
in this step, the count value of the counter is cleared, and the counter belongs to one of the functional modules in the MCU.
S52, when the sampling voltage signal is smaller than the reference voltage signal, adding 1 to a count value, and judging whether the count value reaches a preset count threshold value;
in this step, the minimum value of the preset counting threshold is greater than 1, and the preset counting threshold can be adaptively adjusted and set according to different heating devices.
S53, when the counting value does not reach the preset counting threshold value, closing the power tube, starting the power tube again after preset time, and re-comparing the current sampling voltage signal with the reference voltage signal;
in this step, the count value does not reach the preset count threshold, the power tube is turned on after delaying the preset time, and step S52 is executed again to compare the sampling voltage signal with the reference voltage signal. The preset counting threshold value can be adaptively adjusted according to different heating devices.
And S54, when the counting value reaches the preset counting threshold value, continuously closing the power tube.
Referring to fig. 6, with reference to the heating protection circuit of the first embodiment and the protection method of the present embodiment, an exemplary working flow of the heating protection circuit is as follows:
a1, electrifying a heating protection circuit;
a2, judging whether the enabling signal is effective, and if not, entering the step A3; if yes, entering the step A5;
a3, entering a closing state, and entering a step A4;
a4, judging whether the enabling signal is effective or not, and if yes, entering the step A5; if not, returning to the step A3;
a5, setting a count value to be 0;
a6, entering a heating state;
a7, judging whether the enabling signal is effective, if not, returning to the step A3; if yes, entering the step A8;
a8, judging whether the sampling voltage signal is smaller than the reference voltage signal, if not, returning to the step A6; if yes, entering the step A9;
a9, adding 1 to the count value;
a10, entering a protection state;
a11, judging whether the enable signal is effective, if not, returning to the step A3; if yes, entering the step A12;
a12, judging whether the count value is smaller than a preset count threshold value, if not, returning to the step A10; if yes, entering the step A13;
and A13, starting the power tube after delaying the preset time, and returning to the step A6.
The state of the enable signal is judged first when the heating protection circuit enters each state, so that the power tube is closed in time when the enable signal is invalid, heating is stopped, and the power tube is protected.
In summary, according to the heating protection circuit, the heating device and the protection method provided by the invention, the current sampling resistor and the temperature sampling resistor are sequentially arranged on the drain electrode of the power tube, and the control module can monitor and protect the power tube only by arranging a single port for the sampling circuit, so that software and hardware resources of the MCU are saved, and the selection of the MCU is more flexible. In addition, compare in the heating protection circuit among the prior art, this application has reduced the setting of two resistances, is favorable to the miniaturization and the production debugging of product.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent modifications made by the contents of the present specification and the drawings, or applied to the related technical fields directly or indirectly, are included in the scope of the present invention.
Claims (10)
1. A thermal protection circuit, comprising:
the source electrode of the power tube is used for being connected with a power supply;
one end of the current sampling resistor is connected with the drain electrode of the power tube;
one end of the temperature sampling resistor is connected with the other end of the current sampling resistor, the other end of the temperature sampling resistor is grounded, and the temperature sampling resistor is attached to the power tube; and
control module, control module connects the grid of power tube, control module is provided with first port, first port is connected respectively the other end of current sampling resistance and the one end of temperature sampling resistance, control module is used for control opening and closing of power tube, through first port acquires the response the sampled voltage signal of power tube temperature and electric current, and is in the sampled voltage signal closes when unusual the power tube.
2. The thermal protection circuit of claim 1, wherein the control module comprises:
a reference unit for providing a reference voltage signal;
the comparison unit is connected with the reference unit, is respectively connected with the current sampling resistor and the temperature sampling resistor through the first port, and is used for acquiring the reference voltage signal and the sampling voltage signal, comparing the reference voltage signal with the sampling voltage signal and outputting a feedback signal according to a comparison result; and
and the control unit is respectively connected with the comparison unit and the grid electrode of the power tube and is used for controlling the power tube to be switched on and off, acquiring the feedback signal and responding to the feedback signal to switch off the power tube when the sampling voltage signal is abnormal.
3. The thermal protection circuit of claim 2, wherein the power transistor is disposed outside the control module, the control module is provided with a second port, and the control unit is connected to the gate of the power transistor through the second port.
4. The thermal protection circuit of claim 2, wherein the power transistor is integrated inside the control module, the control module is provided with a third port, and a drain of the power transistor is connected to one end of the current sampling resistor through the third port.
5. The heating protection circuit according to claim 2, wherein the comparison unit comprises a comparator, a positive input terminal of the comparator is connected to the current sampling resistor and the temperature sampling resistor through the first port, respectively, a negative input terminal of the comparator is connected to the reference unit, and an output terminal of the comparator is connected to the control unit.
6. The thermal protection circuit of claim 5, wherein said reference cell comprises a first resistor and a second resistor;
one end of the first resistor is used for connecting a power supply, and the other end of the first resistor is connected with the negative input end of the comparator;
one end of the second resistor is connected with the other end of the first resistor, and the other end of the second resistor is grounded.
7. The heating protection circuit according to claim 2, wherein the control module is further provided with a fourth port and a fifth port, the control unit is connected to the fourth port and the fifth port, respectively, and the control unit is configured to receive an enable signal through the fourth port, control the power tube to be turned on and off in response to the enable signal, and output a protection signal through the fifth port when the sampling voltage signal is abnormal.
8. A heating apparatus, comprising a heating element and the heating protection circuit as claimed in any one of claims 1 to 7, wherein one end of the heating element is connected to the drain of the power tube in the heating protection circuit, and the other end of the heating element is grounded.
9. A method of protection, comprising the steps of:
providing an enabling signal and driving a power tube according to the enabling signal;
acquiring a sampling voltage signal responding to the temperature and the current of the power tube;
providing a reference voltage signal and comparing the reference voltage signal with the sampling voltage signal;
when the sampling voltage signal is greater than the reference voltage signal, enabling the power tube to be kept in an opening state;
and when the sampling voltage signal is smaller than the reference voltage signal, performing overcurrent and overtemperature protection on the power tube.
10. The protection method according to claim 9, wherein the step of performing over-current and over-temperature protection on the power tube when the sampling voltage signal is smaller than the reference voltage signal comprises:
providing a counter and initializing a count value;
when the sampling voltage signal is smaller than the reference voltage signal, adding 1 to a count value, and judging whether the count value reaches a preset count threshold value;
when the counting value does not reach the preset counting threshold value, closing the power tube, opening the power tube again after preset time, and re-comparing the current sampling voltage signal with the reference voltage signal;
and when the counting value reaches the preset counting threshold value, continuously closing the power tube.
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