CN117977495A - Overheat protection circuit for control board - Google Patents
Overheat protection circuit for control board Download PDFInfo
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- CN117977495A CN117977495A CN202410383840.4A CN202410383840A CN117977495A CN 117977495 A CN117977495 A CN 117977495A CN 202410383840 A CN202410383840 A CN 202410383840A CN 117977495 A CN117977495 A CN 117977495A
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- 239000003990 capacitor Substances 0.000 claims description 60
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Abstract
The invention discloses a control panel overheat protection circuit, which relates to the field of safety protection, and comprises: the temperature detection module is used for detecting the temperature of the current control panel, and when the temperature reaches a first threshold value, the power-off mode judgment module is driven to work; the power-off mode judging module is used for detecting the temperature of the control panel again, and when the temperature reaches a second threshold value, the power-off mode judging module has the beneficial effects that: the invention sets the time sequence power-off module, and under the condition of permission, the loops of the control board, the communication device, the working device, the acquisition device, the storage device and the power supply are sequentially disconnected, so that the instant current in the power-off process of the control board is smaller, the service life of the control board is prolonged, after the temperature of the control board is recovered to be normal, the loops of the control board, the communication device, the power supply, the storage device, the acquisition device and the working device are sequentially recovered by the time sequence power-off module, and the instant current generated when the control board is powered on again after the power-off is avoided.
Description
Technical Field
The invention relates to the field of safety protection, in particular to a control board overheat protection circuit.
Background
When the control board is in operation, a certain amount of heat is generated due to components and circuits inside the control board. Excessive heat accelerates the aging of the controller components and shortens the life of the equipment, so that the control board is generally provided with an overheat protection circuit.
When the temperature of the control panel is detected to be too high, the existing overheat protection circuit can directly disconnect a power supply of the control panel, the power supply is disconnected to cause a plurality of connectors of the control panel to be powered off simultaneously to stop working, the instantaneous current of the plurality of connectors when the power of the control panel is interrupted at the same time is relatively large, the service life of the control panel can be influenced, and improvement is needed.
Disclosure of Invention
The present invention is directed to a control board overheat protection circuit, which solves the above-mentioned problems in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a control board overheat protection circuit comprising:
the temperature detection module is used for detecting the temperature of the current control panel, and when the temperature reaches a first threshold value, the power-off mode judgment module is driven to work;
The power-off mode judging module is used for detecting the temperature of the control panel again, and disconnecting the power supply of the control panel working module when the temperature reaches a second threshold value; when the temperature does not reach the second threshold value, controlling the power-off module to work according to the time sequence;
The time-sequence power-off module is used for sequentially disconnecting the control panel, the communication device, the working device, the acquisition device, the storage device and the loop of the power supply when the power-off mode judging module drives to work; when the power-off mode judging module changes the driving operation into the stopping driving operation, sequentially recovering loops of the control board, the communication device, the power supply source, the storage device, the acquisition device and the working device;
the control panel working module is used for obtaining working voltage through a power supply, storing data through the storage device, obtaining environmental information through the acquisition device, controlling the load to work through the working device, and communicating with the upper computer through the communication device;
the output end of the temperature detection module is connected with the input end of the power-off mode judging module, the output end of the power-off mode judging module is connected with the input end of the power-off module according to the time sequence and the input end of the control panel working module, and the output end of the power-off module according to the time sequence is connected with the input end of the control panel working module.
As still further aspects of the invention: the control panel working module is provided with six input ends; the power-off mode judging module is provided with two output ends; the time sequence power-off module is provided with five output ends and two input ends; two output ends of the power-off mode judging module are connected with two input ends of the time sequence power-off module, and one output end of the power-off mode judging module is connected with one input end of the control panel working module; the five output ends of the time sequence power-off module are connected with the other five input ends of the control panel working module.
As still further aspects of the invention: the temperature detection module comprises a first resistor, a first diode, a first silicon controlled rectifier, a first capacitor and a second resistor, wherein the first diode is a light emitting diode, the first silicon controlled rectifier is a P-type control gate thermal thyristor, the model is TT102, one end of the first resistor is connected with a power supply voltage, the other end of the first resistor is connected with the positive electrode of the first diode, the negative electrode of the first diode is connected with the positive electrode of the first silicon controlled rectifier, the negative electrode of the first silicon controlled rectifier is grounded, the control electrode of the first silicon controlled rectifier is connected with one end of the first capacitor and one end of the second resistor, the other end of the first capacitor is grounded, and the other end of the second resistor is grounded.
As still further aspects of the invention: the power-off mode judging module comprises a third resistor, a first triode, a fourth resistor, a temperature-sensitive resistor, a second diode and a second capacitor, wherein the first triode is a phototriode, one end of the third resistor is connected with a power supply voltage, the other end of the third resistor is connected with a collector of the first triode, a base of the first triode receives light emitted by the first diode, an emitter of the first triode is connected with one end of the fourth resistor, the other end of the fourth resistor is connected with a cathode of the second diode, one end of the temperature-sensitive resistor, one end of the second capacitor and an input end of the time-sequence power-off module, the other end of the temperature-sensitive resistor is grounded, and the other end of the second capacitor is grounded.
As still further aspects of the invention: the sequential power-off module comprises:
The signal detection unit is used for detecting whether the output signal of the power-off mode judging module accords with a set signal or not, and when the output signal accords with the set signal, the time sequence output unit is driven to work; when the time sequence output units are not matched, the time sequence output units are not driven to work;
The time sequence output unit is used for sequentially disconnecting the loops of the control board, the communication device, the working device, the acquisition device, the storage device and the power supply when in operation; when the device does not work, on the premise that the loops of the control board, the power supply, the storage device, the acquisition device, the working device and the communication device are disconnected, the loops of the control board, the communication device, the power supply, the storage device, the acquisition device and the working device are sequentially recovered;
the output end of the signal detection unit is connected with the input end of the time sequence output unit.
As still further aspects of the invention: the signal detection unit comprises an inverter and an AND gate, wherein the input end of the inverter is connected with the output end of the power-off mode judgment module, the output end of the inverter is connected with one end of the input end of the AND gate, the other end of the input end of the AND gate is connected with the output end of the power-off mode judgment module, and the output end of the AND gate is connected with the input end of the time sequence output unit.
As still further aspects of the invention: the time sequence output unit comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a third diode, a fourth diode, a fifth diode and a sixth diode, wherein one end of the fifth resistor is connected with the output end of the signal detection unit and the input end of the control board working module, the other end of the fifth resistor is connected with one end of the third capacitor, the negative electrode of the third diode and one end of the sixth resistor, the other end of the third capacitor is grounded, the positive electrode of the third diode is connected with the input end of the control board working module, the other end of the sixth resistor is connected with one end of the fourth capacitor, the negative electrode of the fourth diode, the other end of the fourth diode is grounded, the positive electrode of the fourth diode is connected with the input end of the control board working module, the other end of the fifth diode is connected with the negative electrode of the fifth diode, the other end of the eighth diode is grounded, the positive electrode of the other end of the fifth diode is connected with the other end of the control board working module, and the other end of the eighth diode is grounded.
As still further aspects of the invention: the control panel work module comprises a control panel, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, a sixth switch tube and a seventh switch tube, wherein a power supply opening of the control panel is connected with a D electrode of the second switch tube, an S electrode of the second switch tube is connected with a D electrode of the seventh switch tube, an S electrode of the seventh switch tube is connected with a power supply voltage, a G electrode of the second switch tube is connected with an output end of the power-off mode judging module, a G electrode of the seventh switch tube is connected with an output end of the time-sequence power-off module, a G electrode of the sixth switch tube is connected with an output end of the time-sequence power-off module, a G electrode of the fourth switch tube is connected with an output end of the time-sequence power-off module, a G electrode of the third switch tube is connected with an output end of the time-sequence power-off module, an S electrode of the third switch tube is connected with a UART (universal asynchronous receiver/transmitter) opening, a D electrode of the third switch tube is connected with a communication device, an S electrode of the fourth switch tube is connected with a GPIO (controller) opening of the control panel, a D electrode of the fourth switch tube is connected with a D electrode of the USB (serial bus) device, and a sixth switch tube is connected with a D electrode of the USB device of the USB (USB) is connected with the USB device.
Compared with the prior art, the invention has the beneficial effects that: the invention sets the time sequence power-off module, and under the condition of permission, the loops of the control board, the communication device, the working device, the acquisition device, the storage device and the power supply are sequentially disconnected, so that the instant current in the power-off process of the control board is smaller, the service life of the control board is prolonged, after the temperature of the control board is recovered to be normal, the loops of the control board, the communication device, the power supply, the storage device, the acquisition device and the working device are sequentially recovered by the time sequence power-off module, and the instant current generated when the control board is powered on again after the power-off is avoided.
Drawings
Fig. 1 is a schematic diagram of a control board overheat protection circuit.
Fig. 2 is a circuit diagram of the temperature detection module and the power-off mode judgment module.
FIG. 3 is a circuit diagram of a power-off module according to time sequence.
Fig. 4 is a circuit diagram of the control board working module.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present invention are included in the protection scope of the present invention.
Referring to fig. 1, a control board overheat protection circuit includes:
The temperature detection module 1 is used for detecting the temperature of the current control panel X, and when the temperature reaches a first threshold value, the power-off mode judgment module 2 is driven to work;
the power-off mode judging module 2 is used for detecting the temperature of the control panel X again, and disconnecting the power supply of the control panel working module 4 when the temperature reaches a second threshold value; when the temperature does not reach the second threshold value, the sequential power-off module 3 is controlled to work;
the time-sequence power-off module 3 is used for sequentially disconnecting the control panel X, the communication device, the working device, the acquisition device, the storage device and the loop of the power supply when the power-off mode judging module 2 drives to work; when the driving operation of the power-off mode judging module 2 is changed into the stopping driving operation, sequentially recovering loops of the control panel X, the communication device, the power supply source, the storage device, the acquisition device and the working device;
the control panel working module 4 is used for obtaining working voltage through a power supply, storing data through a storage device, obtaining environmental information through an acquisition device, controlling the work of a load through a working device and communicating with an upper computer through a communication device;
The output end of the temperature detection module 1 is connected with the input end of the power-off mode judging module 2, the output end of the power-off mode judging module 2 is connected with the input end of the time sequence power-off module 3 and the input end of the control panel working module 4, and the output end of the time sequence power-off module 3 is connected with the input end of the control panel working module 4.
In this embodiment: referring to fig. 1,2,3 and 4, the control board working module 4 has six input terminals; the power-off mode judging module 2 is provided with two output ends; the time sequence power-off module 3 is provided with five output ends and two input ends; two output ends of the power-off mode judging module 2 are connected with two input ends of the time-sequence power-off module 3, and one output end of the power-off mode judging module 2 is connected with one input end of the control board working module 4; the five output ends of the time sequence power-off module 3 are connected with the other five input ends of the control panel working module 4.
In this embodiment: referring to fig. 2, the temperature detection module 1 includes a first resistor R1, a first diode D1, a first thyristor Z1, a first capacitor C1, and a second resistor R2, where the first diode D1 is a light emitting diode, the first thyristor Z1 is a P-type control gate thermal thyristor, the model TT102 is implemented, one end of the first resistor R1 is connected to a power supply voltage VCC, the other end of the first resistor R1 is connected to an anode of the first diode D1, a cathode of the first diode D1 is connected to an anode of the first thyristor Z1, a cathode of the first thyristor Z1 is grounded, a control electrode of the first thyristor Z1 is connected to one end of the first capacitor C1 and one end of the second resistor R2, the other end of the first capacitor C1 is grounded, and the other end of the second resistor R2 is grounded.
According to the characteristics of the P-type control gate thermal thyristor (TT 102), the conducting temperature of the device is determined by the resistance value of the second resistor R2, and the larger the resistance value of the second resistor R2 is, the lower the conducting temperature is. When placed at the control panel X, it can serve as a temperature indication. When the temperature of the control board X exceeds the first threshold value, the first silicon controlled rectifier Z1 is conducted, so that the branch where the first diode D1 is located becomes a loop, and the first diode D1 emits light.
In another embodiment: the P-type control gate thermal thyristor is used as a temperature detection device, and temperature information of the control panel X can be obtained by using temperature sensitive resistors RW, temperature sensors and other devices.
In this embodiment: referring to fig. 2, the power-off mode determining module 2 includes a third resistor R3, a first triode V1, a fourth resistor R4, a temperature-sensitive resistor RW, a second diode D2, and a second capacitor C2, wherein the first triode V1 is a phototransistor, one end of the third resistor R3 is connected to a supply voltage VCC, the other end of the third resistor R3 is connected to a collector of the first triode V1, a base of the first triode V1 receives light emitted by the first diode D1, an emitter of the first triode V1 is connected to one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to a negative electrode of the second diode D2, one end of the temperature-sensitive resistor RW, one end of the second capacitor C2, an input end of the power-off module 3 according to a time sequence, the other end of the temperature-sensitive resistor RW is grounded, the other end of the second capacitor C2 is grounded, and an anode of the second diode D2 is connected to an input end of the power-off module 3 according to a time sequence, and an input end of the control board working module 4.
When the first diode D1 emits light, the base electrode of the first triode V1 is irradiated, the first triode V1 is conducted, a circuit where the temperature-sensitive resistor RW is conducted, the temperature-sensitive resistor RW is also arranged at the control panel X, the temperature of the control panel X is detected, when the temperature of the control panel X reaches a first threshold value and does not reach a second threshold value, the temperature of the control panel X is higher, but the temperature of the control panel X is not required to be completely powered off immediately, at the moment, the voltage on the temperature-sensitive resistor RW is smaller, the second diode D2 (voltage-stabilizing diode) is not conducted, at the moment, the common point A1 is high level, the common point A2 is low level, and the operation of the time-sequence power-off module 3 is triggered; when the temperature of the control board X reaches the second threshold value, the control board X is higher in temperature and should be completely powered off in time, the voltage on the temperature sensitive resistor RW is larger, the second diode D2 is turned on, and the power supply of the control board working module 4 is directly disconnected.
In another embodiment: the fourth resistor R4 provided here may be modified as a potentiometer, facilitating adjustment of the duty cycle of the temperature sensitive resistor RW in the supply voltage VCC.
In this embodiment: referring to fig. 3, the sequential power-off module 3 includes:
The signal detection unit is used for detecting whether the output signal of the power-off mode judging module 2 accords with a set signal, and when the output signal accords with the set signal, the time sequence output unit is driven to work; when the time sequence output units are not matched, the time sequence output units are not driven to work;
The time sequence output unit is used for sequentially disconnecting the control panel X, the communication device, the working device, the acquisition device, the storage device and a loop of a power supply when working; when the device does not work, on the premise that the loops of the control panel X and the power supply, the storage device, the acquisition device, the working device and the communication device are disconnected, the loops of the control panel X and the communication device, the power supply, the storage device, the acquisition device and the working device are sequentially recovered;
the output end of the signal detection unit is connected with the input end of the time sequence output unit.
In this embodiment: referring to fig. 3, the signal detection unit includes an inverter U1 and an and gate U2, wherein an input end of the inverter U1 is connected to an output end of the power-off mode determination module 2, an output end of the inverter U1 is connected to one end of an input end of the and gate U2, another end of the input end of the and gate U2 is connected to an output end of the power-off mode determination module 2, and an output end of the and gate U2 is connected to an input end of the timing output unit.
When the common point A1 is at a high level and the common point A2 is at a low level, the low level is changed into the high level through the inverter U1 at this time, so that both input ends of the and gate U2 are at the high level, the and gate U2 outputs the high level, and the time sequence output unit is triggered to operate.
In another embodiment: the AND gate U2 can be replaced by a switch tube combination, voltages at the common point A1 and the common point A2 can be used as trigger signals, and the switch tube combination can be conducted to trigger the time sequence output unit to work only when the common point A1 is in a high level and the common point A2 is in a low level.
In this embodiment: referring to fig. 3, the time-series output unit includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a third diode D3, a fourth diode D4, a fifth diode D5, and a sixth diode D6, one end of the fifth resistor R5 is connected to the output end of the signal detection unit, the input end of the control board operating module 4, the other end of the fifth resistor R5 is connected to one end of the third capacitor C3, the negative electrode of the third diode D3, one end of the sixth resistor R6, the other end of the third capacitor C3 is grounded, the positive electrode of the third diode D3 is connected to the input end of the control board operating module 4, the other end of the sixth resistor R6 is connected to one end of the fourth capacitor C4, one end of the positive electrode of the fourth diode D4 is grounded, the other end of the positive electrode of the fourth resistor D4 is connected to the other end of the fourth capacitor C6 is connected to the positive electrode of the control board, the other end of the positive electrode of the fourth resistor D6 is connected to the other end of the fourth capacitor C6, the other end of the positive electrode of the fourth resistor D7 is connected to the other end of the fourth capacitor C6 is connected to the negative electrode of the fourth capacitor C6, the other end of the positive electrode of the fourth resistor D7 is connected to the other end of the fourth capacitor C6 is grounded, and the other end of the positive electrode of the fourth resistor D7 is connected to the positive electrode of the fourth capacitor C6 is connected to the negative electrode of the fourth capacitor C6 is connected to the negative electrode is connected.
The signal detection unit outputs a high level so that the common point A3 is at a high level, and simultaneously charges the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, and the sixth capacitor C6 through resistors, and the voltages on the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, and the sixth capacitor C6 are sequentially reduced based on the voltages from high to low, so that after the common point A3 is at the high level, the common point A4, the common point A5, the common point A6, and the common point A7 are sequentially all at the high level, and then the loop of the control board X and the communication device, the working device, the acquisition device, the storage device, and the power supply (here, the power supply voltage VCC) is sequentially disconnected. After the power is off, the control board X stops working, the temperature on the control board X gradually drops, when the temperature drops below a first threshold value, the first triode V1 is cut off, at this time, based on the existence of the second capacitor C2, the high level of the common point A1 and the low level of the common point A2 are still kept, frequent turn-on and turn-off of the loop are avoided, when the common point A1 becomes low level, the and gate U2 outputs the low level, the common point A3 becomes low level, and based on the voltages on the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5 and the sixth capacitor C6, the voltage is gradually reduced, so that the common point A7 becomes low level first, the common point A6, the common point A5 and the common point A4 become low level again in sequence, and the loops of the control board X, the communication device, the power supply source, the storage device, the acquisition device and the working device are restored in sequence. Thereby avoiding excessive current generated at the moment of power-off and power-on of the control panel X due to temperature factors.
In another embodiment: the control board X and the loops of the communication device, the power supply, the storage device, the acquisition device and the working device are sequentially disconnected, and the loops of the control board X and the communication device, the power supply, the storage device, the acquisition device and the working device are sequentially restored, so that the sequence of disconnection and restoration of the loops can be changed.
In this embodiment: referring to fig. 4, the control board working module 4 includes a control board X, a second switching tube V2, a third switching tube V3, a fourth switching tube V4, a fifth switching tube V5, a sixth switching tube V6, and a seventh switching tube V7, wherein a power supply port of the control board X is connected to a D pole of the second switching tube V2, an S pole of the second switching tube V2 is connected to a D pole of the seventh switching tube V7, an S pole of the seventh switching tube V7 is connected to a power supply voltage VCC, a G pole of the second switching tube V2 is connected to an output port of the power-off mode judging module 2, a G pole of the seventh switching tube V7 is connected to an output port of the time-sequence switching-off module 3, a G pole of the fifth switching tube V5 is connected to an output port of the time-sequence switching-off module 3, a G pole of the fourth switching tube V4 is connected to an output port of the time-sequence switching-off module 3, a G pole of the third switching tube V3 is connected to an output port of the time-sequence switching-off module V3, a G pole of the fourth switching tube V3 is connected to an output port of the fourth switching tube V4, a G pole of the fourth switching tube V7 is connected to an output port of the fourth switching tube V4, and a control board of the fourth switching tube is connected to a control board of the fourth switching tube V4 is connected to an output port of the fourth switching tube.
When the temperature of the control board X rises sharply to reach the second threshold (more dangerous), the common point A2 is at a high level, and the second switching tube V2 is directly turned off, so that the circuit between the power supply source (here, the power supply voltage VCC) and the control board X is directly disconnected.
When the temperature of the control panel X rises to a first threshold value and is smaller than a second threshold value (the danger is controllable), the sequential power-off module sequentially turns the common point A3, the common point A4, the common point A5, the common point A6 and the common point A7 into high level, so that the third switching tube V3, the fourth switching tube V4, the fifth switching tube V5, the sixth switching tube V6 and the seventh switching tube V7 are sequentially disconnected, the first-stage power-off treatment is carried out on the control panel X, and the current generated at the moment of power-off is avoided being overlarge; and when the temperature of the control panel X is recovered to be normal, the loop of the control panel X and other devices is recovered at one stage, so that the overlarge current generated at the moment of power-on is avoided. The control board X sends data to the storage device for storage through the SATA port, sends a control signal to the working device through the GPIO port to control the working device to work, and sends data to the communication device through the UART port to be uploaded to the upper computer, and receives the acquired information of the acquisition device through the USB port. The second switching tube V2 to the seventh switching tube V7 are PMOS tubes.
In another embodiment: the control board X and the communication device are unilaterally transmitted, and in consideration of that if information of the upper computer needs to be received, a relay can be selected to replace the third switch tube V3 to construct bidirectional transmission.
The working principle of the invention is as follows: the temperature detection module 1 is used for detecting the temperature of the current control panel X, and when the temperature reaches a first threshold value, the power-off mode judgment module 2 is driven to work; the power-off mode judging module 2 is used for detecting the temperature of the control panel X again, and when the temperature reaches a second threshold value, the power supply of the control panel working module 4 is disconnected; when the temperature does not reach the second threshold value, the sequential power-off module 3 is controlled to work; the time-sequence power-off module 3 is used for sequentially disconnecting the control panel X, the communication device, the working device, the acquisition device, the storage device and the loop of the power supply when the power-off mode judging module 2 drives to work; when the driving operation of the power-off mode judging module 2 is changed into the stopping driving operation, sequentially recovering loops of the control panel X, the communication device, the power supply source, the storage device, the acquisition device and the working device; the control panel work module 4 is used for obtaining working voltage through a power supply, storing data through a storage device, obtaining environmental information through an acquisition device, controlling load work through a work device, and communicating with an upper computer through a communication device.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention 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 invention 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 (8)
1. A control board overheat protection circuit, characterized in that the control board overheat protection circuit comprises:
the temperature detection module is used for detecting the temperature of the current control panel, and when the temperature reaches a first threshold value, the power-off mode judgment module is driven to work;
The power-off mode judging module is used for detecting the temperature of the control panel again, and disconnecting the power supply of the control panel working module when the temperature reaches a second threshold value; when the temperature does not reach the second threshold value, controlling the power-off module to work according to the time sequence;
The time-sequence power-off module is used for sequentially disconnecting the control panel, the communication device, the working device, the acquisition device, the storage device and the loop of the power supply when the power-off mode judging module drives to work; when the power-off mode judging module changes the driving operation into the stopping driving operation, sequentially recovering loops of the control board, the communication device, the power supply source, the storage device, the acquisition device and the working device;
the control panel working module is used for obtaining working voltage through a power supply, storing data through the storage device, obtaining environmental information through the acquisition device, controlling the load to work through the working device, and communicating with the upper computer through the communication device;
the output end of the temperature detection module is connected with the input end of the power-off mode judging module, the output end of the power-off mode judging module is connected with the input end of the power-off module according to the time sequence and the input end of the control panel working module, and the output end of the power-off module according to the time sequence is connected with the input end of the control panel working module.
2. The control board overheat protection circuit of claim 1, wherein the control board working module has six inputs; the power-off mode judging module is provided with two output ends; the time sequence power-off module is provided with five output ends and two input ends; two output ends of the power-off mode judging module are connected with two input ends of the time sequence power-off module, and one output end of the power-off mode judging module is connected with one input end of the control panel working module; the five output ends of the time sequence power-off module are connected with the other five input ends of the control panel working module.
3. The control board overheat protection circuit of claim 1, wherein the temperature detection module comprises a first resistor, a first diode, a first silicon controlled rectifier, a first capacitor and a second resistor, the first diode is a light emitting diode, the first silicon controlled rectifier is a P-type control gate thermal thyristor, the model is TT102, one end of the first resistor is connected with a power supply voltage, the other end of the first resistor is connected with the positive pole of the first diode, the negative pole of the first diode is connected with the positive pole of the first silicon controlled rectifier, the negative pole of the first silicon controlled rectifier is grounded, the control pole of the first silicon controlled rectifier is connected with one end of the first capacitor and one end of the second resistor, the other end of the first capacitor is grounded, and the other end of the second resistor is grounded.
4. The control board overheat protection circuit according to claim 3, wherein the outage mode judgment module comprises a third resistor, a first triode, a fourth resistor, a temperature sensitive resistor, a second diode and a second capacitor, the first triode is a phototransistor, one end of the third resistor is connected with a power supply voltage, the other end of the third resistor is connected with a collector of the first triode, a base of the first triode receives light emitted by the first diode, an emitter of the first triode is connected with one end of the fourth resistor, the other end of the fourth resistor is connected with a cathode of the second diode, one end of the temperature sensitive resistor, one end of the second capacitor and an input end of the time sequence outage module, the other end of the temperature sensitive resistor is grounded, and the other end of the second capacitor is grounded.
5. The control board overheat protection circuit of claim 1 or 2, wherein the sequential power-off module comprises:
The signal detection unit is used for detecting whether the output signal of the power-off mode judging module accords with a set signal or not, and when the output signal accords with the set signal, the time sequence output unit is driven to work; when the time sequence output units are not matched, the time sequence output units are not driven to work;
The time sequence output unit is used for sequentially disconnecting the loops of the control board, the communication device, the working device, the acquisition device, the storage device and the power supply when in operation; when the device does not work, on the premise that the loops of the control board, the power supply, the storage device, the acquisition device, the working device and the communication device are disconnected, the loops of the control board, the communication device, the power supply, the storage device, the acquisition device and the working device are sequentially recovered;
the output end of the signal detection unit is connected with the input end of the time sequence output unit.
6. The control board overheat protection circuit of claim 5, wherein the signal detection unit comprises an inverter, an and gate, wherein an input end of the inverter is connected to an output end of the power-off mode judgment module, an output end of the inverter is connected to one end of an input end of the and gate, the other end of the input end of the and gate is connected to an output end of the power-off mode judgment module, and an output end of the and gate is connected to an input end of the timing output unit.
7. The control board overheat protection circuit of claim 5, wherein the timing output unit comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a third diode, a fourth diode, a fifth diode, a sixth diode, one end of the fifth resistor being connected to the output terminal of the signal detection unit and the input terminal of the control board operation module, the other end of the fifth resistor being connected to one end of the third capacitor, the negative electrode of the third diode, one end of the sixth resistor, the other end of the third capacitor being grounded, the positive electrode of the third diode being connected to the input terminal of the control board operation module, the other end of the sixth resistor being grounded, the positive electrode of the fourth diode being connected to one end of the fourth capacitor, the positive electrode of the fourth diode being connected to the input terminal of the control board operation module, the other end of the fifth diode being connected to the negative electrode of the fifth capacitor, the positive electrode of the other end of the fifth diode being grounded, the other end of the positive electrode of the fifth diode being connected to the other end of the control board operation module, the positive electrode of the other end of the fifth diode being grounded, the other end of the other diode being connected to the negative electrode of the other end of the control board.
8. The control board overheat protection circuit according to claim 1 or 2, wherein the control board operation module comprises a control board, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, a sixth switching tube, and a seventh switching tube, a power supply port of the control board is connected to a D pole of the second switching tube, an S pole of the second switching tube is connected to a D pole of the seventh switching tube, an S pole of the seventh switching tube is connected to a power supply voltage, a G pole of the second switching tube is connected to an output terminal of the power-off mode judgment module, a G pole of the seventh switching tube is connected to an output terminal of the time-series power-off module, a G pole of the fifth switching tube is connected to an output terminal of the time-series power-off module, a G pole of the fourth switching tube is connected to an output terminal of the time-series power-off module, an S pole of the third switching tube is connected to an opening of the control board, a D pole of the third switching tube is connected to a communication device, a G pole of the fourth switching tube is connected to a D pole of the power-off mode judgment module, a G pole of the fourth switching tube is connected to a D pole of the fourth switching tube is connected to a UART, and a D pole of the control board is connected to a D pole of the USB device.
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