CN216649230U

CN216649230U - Low-power consumption high temperature protection circuit

Info

Publication number: CN216649230U
Application number: CN202122822469.1U
Authority: CN
Inventors: 刘德政; 苏帅; 王宗文
Original assignee: Yantai Jereh Oilfield Services Group Co Ltd
Current assignee: Yantai Jereh Oilfield Services Group Co Ltd
Priority date: 2021-11-17
Filing date: 2021-11-17
Publication date: 2022-05-31
Anticipated expiration: 2031-11-17

Abstract

The invention discloses a low-power-consumption high-temperature protection circuit, which is used for solving the problem that the power consumption is reduced while the high-temperature protection of a circuit is difficult to realize. The method comprises the following steps: the power supply, the electricity output end of the power supply is electrically connected with the power supply input end of the system power switch and the power supply input end of the comparison module power switch; the electrical output end of the system power switch is electrically connected with the electrical input end of the electricity utilization control module; the control output end of the electricity utilization control module is in communication connection with the control input end of the power switch of the comparison module, the electricity output end of the electricity utilization control module is electrically connected with the electricity input end of the electricity utilization system, and the electricity utilization control module is used for supplying electricity to the electricity utilization system after being electrified; the electrical output end of the comparison module power switch is electrically connected with the electrical input end of the comparison module; the control output end of the comparison module is in communication connection with the control input end of the system power switch, and the comparison module is used for controlling the system power switch to be disconnected when the ambient temperature is higher than the second preset temperature so as to stop supplying power to the power utilization control module and the power utilization system.

Description

Low-power consumption high temperature protection circuit

Technical Field

The invention relates to the field of electronic circuits, in particular to a low-power-consumption high-temperature protection circuit.

Background

In order to meet the application requirements of the internet of things, part of electronic equipment needs to operate in an environment with higher temperature. If the electronic equipment continues to operate in an environment with too high temperature, irreversible damage to the electronic equipment is often caused. Therefore, the electronic device can be temperature-protected by the temperature protection circuit. Specifically, when the temperature protection circuit detects that the ambient temperature is too high, the electronic device is controlled to be powered off, so that the electronic device is prevented from continuously running in a high-temperature environment.

Although the temperature protection circuit can prevent the electronic device from continuously operating in a high temperature environment, the temperature protection circuit itself continuously consumes energy. For equipment powered by a battery, the temperature protection circuit needs to continuously consume power, is not beneficial to prolonging the endurance time, and is difficult to reduce energy consumption while realizing high-temperature protection on the circuit.

How to reduce the energy consumption while realizing high-temperature protection on the circuit is the technical problem to be solved by the application.

Disclosure of Invention

An object of the embodiments of the present application is to provide a low-power high-temperature protection circuit, so as to solve the problem that it is difficult to implement high-temperature protection for a circuit while reducing power consumption.

In a first aspect, a low power consumption high temperature protection circuit is provided, including:

the power supply, the electricity output end of the said power supply is electrically connected with power supply input end of the system power switch and power supply input end of the comparison module power switch, used for supplying power to system power switch and comparison module power switch;

the system power switch is used for supplying power to the electricity utilization control module when the system power switch is closed;

the control output end of the electricity utilization control module is in communication connection with the control input end of the comparison module power switch, the electricity utilization control module is used for controlling the comparison module power switch to be closed when the ambient temperature is higher than a first preset temperature and controlling the comparison module power switch to be opened when the ambient temperature is lower than or equal to the first preset temperature, the electricity output end of the electricity utilization control module is electrically connected with the electricity input end of an electricity utilization system, and the electricity utilization control module is used for supplying electricity to the electricity utilization system after electricity is powered on;

the electric output end of the comparison module power switch is electrically connected with the electric input end of the comparison module, and the comparison module power switch is used for supplying power to the comparison module when the comparison module power switch is closed;

the control output end of the comparison module is in communication connection with the control input end of the system power switch, the comparison module is used for controlling the system power switch to be disconnected when the ambient temperature is higher than a second preset temperature so as to stop supplying power to the power utilization control module and the power utilization system, wherein the second preset temperature is higher than the first preset temperature.

In the embodiment of the present application, the low power consumption high temperature protection circuit includes: the power supply, the electricity output end of the said power supply is electrically connected with power supply input end of the system power switch and power supply input end of the comparison module power switch, used for supplying power to system power switch and comparison module power switch; the system power switch is used for supplying power to the electricity utilization control module when the system power switch is closed; the control output end of the electricity utilization control module is in communication connection with the control input end of the comparison module power switch, the electricity utilization control module is used for controlling the comparison module power switch to be closed when the ambient temperature is higher than a first preset temperature and controlling the comparison module power switch to be opened when the ambient temperature is lower than or equal to the first preset temperature, the electricity output end of the electricity utilization control module is electrically connected with the electricity input end of an electricity utilization system, and the electricity utilization control module is used for supplying electricity to the electricity utilization system after electricity is powered on; the electric output end of the comparison module power switch is electrically connected with the electric input end of the comparison module, and the comparison module power switch is used for supplying power to the comparison module when the comparison module power switch is closed; the control output end of the comparison module is in communication connection with the control input end of the system power switch, the comparison module is used for controlling the system power switch to be disconnected when the ambient temperature is higher than a second preset temperature so as to stop supplying power to the power utilization control module and the power utilization system, wherein the second preset temperature is higher than the first preset temperature. The power consumption control module and the comparison module of the scheme play a role in high-temperature protection, wherein the power consumption control module compares the first preset temperature with lower temperature with the ambient temperature, if the ambient temperature is higher, the power is turned on to start the comparison module, the second preset temperature with higher temperature is compared with the ambient temperature by the comparison module, and if the ambient temperature is higher, the power switch of the control system is powered off, so that the protection of the power consumption control module and the power consumption system is realized, and the power consumption control module and the power consumption system are prevented from continuously operating at high temperature. Wherein, also no longer according to first temperature threshold monitoring temperature after with the power control module outage. The power utilization control module controls the comparison module to be powered off when the ambient temperature is lower than the first temperature threshold, power consumption of the comparison module is effectively reduced, and the comparison module does not monitor the temperature according to the second temperature threshold after being powered off. The scheme can realize continuous high-temperature protection, and timely power off is carried out when the temperature is higher than a second preset temperature so as to protect the power utilization control module and the power utilization system. And, carry out the outage to some circuits according to the height of ambient temperature to this reduces the whole power consumption of circuit.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic circuit diagram of a low power consumption high temperature protection circuit according to an embodiment of the present invention.

Fig. 2 is a second schematic circuit diagram of a low-power-consumption high-temperature protection circuit according to an embodiment of the invention.

FIG. 3 is a schematic diagram of the operating period of the periodic operation of the circuit according to one embodiment of the present invention.

Fig. 4 is a third schematic circuit diagram of a low-power-consumption high-temperature protection circuit according to an embodiment of the present invention.

Fig. 5 is a fourth schematic circuit diagram of a low power consumption high temperature protection circuit according to an embodiment of the invention.

Fig. 6 is a fifth schematic circuit diagram of a low-power-consumption high-temperature protection circuit according to an embodiment of the invention.

Fig. 7 is a sixth schematic diagram of a circuit structure of a low-power high-temperature protection circuit according to an embodiment of the invention.

Fig. 8 is a seventh schematic circuit diagram of a low-power-consumption high-temperature protection circuit according to an embodiment of the present invention.

Fig. 9 is an eighth schematic circuit diagram of a low-power-consumption high-temperature protection circuit according to an embodiment of the invention.

Fig. 10 is a ninth schematic diagram of a circuit structure of a low-power high-temperature protection circuit according to an embodiment of the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The reference numbers in the present application are only used for distinguishing the steps in the scheme and are not used for limiting the execution sequence of the steps, and the specific execution sequence is described in the specification.

In order to solve the problems in the prior art, an embodiment of the present application provides a low-power-consumption high-temperature protection circuit, and fig. 1 shows a schematic circuit diagram provided in the present solution, where a thick solid line connected between modules represents an electrical connection and can be used for implementing power supply, and a thin solid line connected between modules represents a communication connection and can be used for implementing transmission of a control instruction. The circuit that this scheme provided includes:

and the power supply 11, the electric output end of the power supply 11 is electrically connected with the power supply input end of the system power switch 12 and the power supply input end of the comparison module power switch 13, and the power supply 11 is used for supplying power to the system power switch 12 and the comparison module power switch 13.

The power supply in the embodiment of the present application may specifically be a high-temperature battery that can supply power in a high-temperature environment, and may also be referred to as a high-temperature-resistant battery. When regard as the power with the high temperature battery, the circuit that this application embodiment provided can be applied to mobile device, and this mobile device can be for example portable electronic equipment such as cell-phone, notebook, intelligent wrist-watch, also can be used for the mobile device of information acquisition through remote control such as exploration car, unmanned aerial vehicle.

The system power switch 12, an electrical output of the system power switch 12 is electrically connected to an electrical input of the power utilization control module 14, and the system power switch 12 is configured to supply power to the power utilization control module 14 when closed.

The system power switch is powered by a power supply, can be switched on and off at any time according to a received signal, and is used for controlling whether the electric energy of the power supply is supplied to the power utilization control module. And when the system power switch is closed, the power utilization control module operates based on the electric energy supplied by the system power switch.

The control output end of the power utilization control module 14 is in communication connection with the control input end of the comparison module power switch 13, the power utilization control module 14 is used for controlling the comparison module power switch 13 to be closed when the ambient temperature is higher than a first preset temperature, and controlling the comparison module power switch 13 to be opened when the ambient temperature is lower than or equal to the first preset temperature, the electrical output end of the power utilization control module 14 is electrically connected with the electrical input end of the power utilization system 15, and the power utilization control module 14 is used for supplying power to the power utilization system 15 after being powered on.

And if the power utilization control module is in a power-on state, the power utilization control module provides electric energy to the power utilization system so as to drive the power utilization system to operate. In the scheme, the power utilization control module and the power utilization system are in the same power utilization state, namely the power utilization system is powered on when the power utilization control module is powered on. And if the system power switch is disconnected and the power supply to the power utilization control module is stopped, the power utilization system is also powered off.

The power utilization control module can detect the ambient temperature and compare the ambient temperature with the lower first preset temperature. Because the change of the environmental temperature is usually gradual change and the change of the temperature is usually continuous, the temperature is inevitably gradually changed rather than jumped by temperature rise, and the electric control module carries out temperature comparison based on a first lower preset temperature in the scheme, so that the power switch of the comparison module is controlled to be switched off when the temperature is not more than the first preset temperature, the comparison module is controlled to be powered off, and the power consumption is reduced.

And when the temperature is higher than the first preset temperature, the environment temperature has a too high risk, if the temperature is continuously increased, the power switch of the comparison module is controlled to be closed, the comparison module is powered on to work so as to monitor the environment temperature, and then the power switch of the system is controlled to be disconnected when the temperature is too high, so that the power control module and the power system are protected.

Optionally, the functional module in the power consumption control module for performing temperature detection and comparison may be a module with low energy consumption, low precision and a certain delay, so as to further reduce the energy consumption of the power consumption control module for detecting and comparing the temperature.

The electrical output end of the comparison module power switch 13 is electrically connected with the electrical input end of the comparison module 16, and the comparison module power switch 13 is used for supplying power to the comparison module 16 when being closed.

The power switch of the comparison module is directly powered by a power supply, and can be switched on and off at any time according to a received instruction so as to control whether to supply power to the comparison module. When the power switch of the comparison module is closed, the electric energy provided by the power supply is provided to the comparison module so as to drive the comparison module to operate and execute temperature detection and comparison. When the power switch of the comparison module is disconnected, the power supply to the comparison module is stopped, so that the comparison module is powered off, and the effect of reducing the power consumption is achieved.

The control output end of the comparison module 16 is in communication connection with the control input end of the system power switch 12, and the comparison module 16 is configured to control the system power switch 12 to be turned off when the ambient temperature is greater than a second preset temperature, so as to stop supplying power to the power utilization control module 14 and the power utilization system 15, where the second preset temperature is greater than the first preset temperature.

The comparison module is used for obtaining the ambient temperature and comparing the ambient temperature based on a second preset temperature, if the ambient temperature is higher than the second preset temperature, the ambient temperature is over high, the power utilization system and the power utilization control module can be damaged when continuously running at the higher ambient temperature, and therefore the power switch of the control system is switched off to stop supplying power to the power utilization control module and the power utilization system. By cutting off the power supply, the high-temperature protection can be realized for the power utilization system and the power utilization control module.

Optionally, the power supply in this scheme is directly electrically connected to the system power switch and the comparison module power switch, respectively, so as to continuously supply power to the system power switch and the comparison module power switch. The comparison module power switch and the comparison module and the system power switch and the power utilization control module can be directly electrically connected so as to control whether to supply power to the modules or not through the on-off of the switches.

The comparison module power switch and the power utilization control module and the comparison module and the system power switch can be in communication connection, and specifically can be in wired or wireless connection to realize instruction transmission.

For example, the point control module and the comparison module power switch may be in communication connection in a short-range wireless communication manner, and the power utilization control module generates a wireless signal and transmits the wireless signal to the comparison module power switch to control the comparison module power switch to be turned on or off.

The power utilization control module and the comparison module of the scheme play a role in high-temperature protection, wherein the power utilization control module compares a first temperature threshold value with a lower temperature with the ambient temperature, and the comparison module is powered on and started if the ambient temperature is higher, so that the comparison module controls power failure when the temperature is too high, and indirect temperature protection is realized. The comparison module compares the second temperature threshold with higher temperature with the ambient temperature, and if the ambient temperature is higher, the power switch of the system is controlled to be powered off, so that the direct temperature protection of the power utilization control module and the power utilization system is realized.

Moreover, the power consumption control module controls the comparison module to be powered off when the ambient temperature is lower than the first temperature threshold value, so that the power consumption of the comparison module is effectively reduced. The comparison module does not monitor the temperature according to the second temperature threshold after the power is off. If the power supply is a battery, the scheme can reduce the power consumption and is beneficial to prolonging the endurance time.

Based on the solutions provided by the above embodiments, optionally, as shown in fig. 2, the power utilization control module 14 includes:

a multi-point control Unit MCU (MCU) 141, configured to compare a first ambient temperature with a first preset temperature, send a close signal to the comparison module power switch 13 when the first ambient temperature is greater than the first preset temperature, and send an open signal to the comparison module 13 when the first ambient temperature is less than or equal to the first preset temperature.

The MCU may be integrated with a first temperature detection module, and the comparison is performed based on the first ambient temperature and the ambient temperature by an electronic device having a comparison function such as a comparator.

A first temperature detecting module 142, communicatively connected to the multipoint control unit 141, configured to send the detected ambient temperature to the multipoint control unit 141 as a first ambient temperature.

The first temperature detection module can measure the ambient temperature and convert the ambient temperature into an electric signal to be transmitted to the multipoint control unit. For example, the first temperature detecting module may include a thermal resistor, which may also be referred to as a thermistor, and a resistance value of the thermistor may vary with a temperature of an environment where the thermistor is located, so that the environment temperature may be converted into an electrical signal for the MCU to decide to generate the closing signal or the opening signal.

According to the scheme provided by the embodiment of the application, the electricity utilization control module can execute basic detection and comparison on the ambient temperature, and timely indicates the comparison module to be powered on when the ambient temperature is higher than the first ambient temperature so as to power off the electricity utilization control module and the electricity utilization system when the temperature is too high.

Based on the scheme provided by the above embodiment, optionally, the power utilization control module operates periodically based on a preset time period;

the power utilization control module is used for comparing a first environment temperature with a first preset temperature in a first time period of the preset time length, sending a closing signal to the comparison module power switch when the first environment temperature is higher than the first preset temperature, and sending an opening signal to the comparison module power switch when the first environment temperature is lower than or equal to the first preset temperature;

the electricity utilization control module is in a standby state in a second time period of the preset duration, and the first time period and the second time period are not overlapped.

The power utilization control module specifically comprises an MCU low-power consumption chip U1 running low power consumption, the U1 is in a timing awakening standby mode, the current temperature can be measured in the awakening state, and whether the power supply of the comparator is turned off or not is judged according to comparison between the first preset temperature stored in the power utilization control module and the ambient temperature so as to reduce the power consumption.

The cycle, the first period and the second period in this scheme are explained below with reference to fig. 3. Fig. 3 shows a horizontal axis based on time, which includes a first period, a second period, and a third period. Optionally, in the scheme, the duration of each period is equal and is a preset duration. The power utilization control module in the scheme executes temperature detection and comparison in the first period, and generates a closing signal or an opening signal according to the temperature comparison result so as to control the comparison module to be powered on or powered off. And the power utilization control module enters a standby state in the second time period so as to save energy consumption consumed by the operation of the power utilization control module.

In fig. 3, the operation duration of the power utilization control module is shown by a bold line, and it can be seen that in the process of periodic operation, the power utilization control module is switched between operation and standby, and compared with continuous operation, the scheme can further reduce the overall energy consumption of the circuit.

Since the ambient temperature is often gradually changed rather than abruptly changed, the present solution can monitor the elevated temperature based on the lower first preset temperature in a periodic operation. Once the temperature is higher than the first preset temperature, the comparison module is controlled to be powered on by sending a closing signal, so that the system power switch is powered off in time after the temperature is further increased to the second preset temperature.

In addition, in the process that the ambient temperature is gradually reduced from being higher than the second preset temperature, the power utilization control module in the scheme can also control the comparison module to be powered off through a disconnection instruction when the ambient temperature is not higher than the first preset temperature, so that the technical effect of reducing power consumption is achieved.

Based on the solution provided in the foregoing embodiment, optionally, the first temperature detection module is configured to generate a first ambient temperature voltage according to the detected ambient temperature and send the first ambient temperature voltage to the multipoint control unit, where the ambient temperature detected by the first temperature detection module is negatively correlated with the first ambient temperature voltage;

the multi-point control unit is used for comparing the first environment temperature voltage with a first preset temperature voltage, sending a closing signal to the comparison module power switch when the first environment temperature voltage is smaller than the first preset temperature voltage, and sending an opening signal to the comparison module power switch when the first environment temperature voltage is larger than or equal to the first preset temperature voltage, wherein the first preset temperature voltage is negatively correlated with the first preset temperature.

In the scheme, the ambient temperature is converted into a voltage, and the voltage is compared with a first ambient temperature voltage corresponding to the first ambient temperature. The voltage is inversely related to the temperature, and the MCU determines whether the ambient temperature is greater than a first preset temperature or not by comparing the voltage magnitude, so as to generate a corresponding control signal to control the comparison module to be powered on or powered off.

Based on the solution provided by the above embodiment, optionally, as shown in fig. 4, the comparing module 16 includes:

a comparator 161, configured to compare a second ambient temperature with a second preset temperature, and send a disconnection signal to the system power switch 12 to stop supplying power to the power consumption control module 14 and the power consumption system 15 when the second ambient temperature is greater than the second preset temperature;

a second temperature detecting module 162 communicatively coupled to the comparator 161 for sending the detected ambient temperature to the comparator 161 as a second ambient temperature.

In this scheme, the comparator may be configured to compare the ambient temperature detected by the second temperature detection module with a second preset temperature. Optionally, the second temperature detection module may include a thermal resistor to convert the ambient temperature into an electrical signal for the comparator to perform the comparison. Optionally, the comparison module may further include a reference resistor, and a resistance value of the reference resistor is matched with the second preset temperature.

Through the scheme provided by the embodiment of the application, after the ambient temperature is higher than the first preset temperature, the power switch of the comparison module is closed, and the electric energy transmitted by the power supply is provided to the comparison module. After the comparison module is powered on, the second temperature detection module provides the ambient temperature for the comparator, the comparator compares the ambient temperature with the second preset temperature, and then a corresponding instruction is generated according to the comparison result to control the system power switch to execute switching. Therefore, the power utilization control module and the power utilization system are controlled to be powered off when the ambient temperature is higher than the second preset temperature, and the power utilization control module and the power utilization system are controlled to be powered on when the ambient temperature is not higher than the second preset temperature.

Optionally, each component in the comparison module may select a high-precision low-delay device, so as to improve accuracy of the temperature detection and comparison result.

Based on the solution provided by the above embodiment, optionally, as shown in fig. 5, the comparing module further includes:

a comparison reference circuit 163, communicatively connected to the first input terminal of the comparator, for generating a second preset temperature voltage and sending the second preset temperature voltage to the comparator 161, wherein the second preset temperature voltage is inversely related to the second preset temperature;

the second temperature detection module 162 is communicatively connected to the second input end of the comparator, and is configured to generate a second ambient temperature voltage according to the detected ambient temperature and send the second ambient temperature voltage to the comparator 161, where the ambient temperature monitored by the second temperature detection module 162 is negatively correlated with the second ambient temperature voltage;

the comparator 161 is configured to compare the second ambient temperature voltage with the second preset temperature voltage, and send a disconnection signal to the system power switch 12 to stop supplying power to the power consumption control module 14 and the power consumption system 15 when the second ambient temperature voltage is smaller than the second preset temperature voltage.

According to the scheme provided by the embodiment of the application, the comparison reference circuit provides the second preset temperature voltage corresponding to the second preset temperature for the comparator, the second temperature detection module converts the detected environment temperature into the second environment temperature voltage and provides the second environment temperature voltage for the comparator, and the comparator compares the second preset temperature voltage with the second environment temperature voltage. And then the comparison module generates a corresponding control instruction according to the comparison result of the comparator so as to control the power supply or power failure to the power utilization control module and the power utilization system.

Based on the solution provided by the foregoing embodiment, optionally, as shown in fig. 6, the comparison reference circuit includes a resistor R8 and a resistor R12, the second temperature detection module includes a resistor R7 and a thermistor R11, the resistance of the resistor R7 is equal to the resistance of the resistor R8, the resistance of the thermistor R11 is negatively correlated with the temperature of the environment where the comparison reference circuit is located, and the resistance of the resistor R12 corresponds to the second preset temperature;

the first end of the resistor R7 is connected with the first end of the resistor R8 and is electrically connected with the power switch of the comparison module through a protection resistor R4, the second end of the resistor R7 is electrically connected with the first input end of the comparator, the second end of the resistor R8 is electrically connected with the second input end of the comparator, the first end of the thermistor R11 is electrically connected with the first input end of the comparison module, the first end of the resistor R12 is electrically connected with the second input end of the comparison module, and the second end of the thermistor R11 is connected with the second end of the resistor R12 and is grounded through a protection resistor R13.

The present embodiment provides a specific circuit of a comparing module, where the comparing module includes resistors R8 and R12; the second temperature detection module comprises R7 and a temperature measuring resistor R11; the comparator comprises a comparator U2 and a capacitor C2. The resistors R4 and R13 play a role in limiting current, and the two resistors are shared by the comparison reference circuit and the second temperature detection module, so the precision errors of the two resistors do not influence the comparison result.

Among them, R7, R8, and R12 select a small resistance (for example, several hundred ohms), and the error caused by the accuracy of the resistance itself does not substantially affect the final comparison result. The resistance of R11 varies inversely with temperature, i.e., the resistance of R11 decreases with increasing temperature, and the resistance of R11 increases with decreasing temperature.

Wherein, the resistance values of R7 and R8 are the same, and the resistance value of R12 is the resistance value of the thermistor R11 corresponding to the corresponding temperature, i.e. the second temperature threshold. When the resistance value of the R11 is greater than R12, the current temperature is lower than a second temperature threshold value, namely the voltage of the reverse input end (pin 4) of the U2 is greater than the voltage of the reverse input end (pin 3) of the U2, and the output end (pin 1) of the U2 outputs low level; otherwise, the output end (pin 1) of the U2 outputs high level.

Based on the solution provided by the foregoing embodiment, optionally, as shown in fig. 7, the system power switch includes a resistor R5, a resistor R6, a resistor R9, a resistor R10, a P-MOS transistor Q3, an N-MOS transistor Q4, and a capacitor C3;

a first end of the resistor R10 is electrically connected with the output end of the comparator, and a second end of the resistor R10 is electrically connected with the gate of the P-MOS transistor Q3;

a first end of the P-MOS transistor Q3 is electrically connected with the power supply, a second end of the P-MOS transistor Q3 is electrically connected with a first end of the resistor R6, and a second end of the P-MOS transistor Q3 is electrically connected with the power utilization control module;

a second end of the resistor R6 is electrically connected with the gate of the N-MOS transistor Q4;

a first end of the N-MOS transistor Q4 is electrically connected with a second end of the resistor R9, and a first end of the resistor R9 is electrically connected with a first end of the resistor R10;

a second end of the N-MOS transistor Q4 is connected with a second end of the capacitor C3 and grounded, and a first end of the capacitor C3 is electrically connected with a gate of the P-MOS transistor Q3 and a second end of the resistor R10;

the first end of the resistor R5 is electrically connected with the first end of the P-MOS transistor Q3, and the second end of the resistor R5 is electrically connected with the first end of the resistor R9.

Based on the comparison module provided in the above embodiment, when the U2 outputs a low level, the gate voltage of the Q3 is pulled down through the R10, the Q3 is turned on, and the power supply of the electrical system is turned on. The grid voltage of Q4 is pulled high by the power supply of the electric system through R6, Q4 is turned on, and the grid voltage of Q3 is pulled low through R9 and R10, namely, after the system power supply switching circuit is switched on, a self-locking state is formed and the continuous conduction state is maintained.

When the U2 outputs high voltage, Q3 is turned off through R10, the system power supply is turned off, the corresponding Q4 grid voltage becomes low, Q4 is also turned off, the power supply of the electric system is in a turned-off state, and high-temperature protection is realized on components in the electric system.

Based on the solution provided by the above embodiment, optionally, as shown in fig. 8, the method further includes:

and the electrical input end of the comparison starting module 17 is electrically connected with the electrical output end of the power supply 11, and the control output end of the comparison starting module 17 is in communication connection with the control input end of the comparison module power switch 13 so as to indicate that the comparison module power switch 13 is closed.

The comparison starting module is electrically connected with the power supply, and the power supply supplies power to the comparison starting module after being powered on. The comparison starting module in the scheme is used for starting the comparison module after the power supply is electrified to close the power switch, so that the comparison module is started after the power supply is electrified. The comparison module can in time detect ambient temperature after the power is on, and then predetermine the temperature execution with the second and compare ambient temperature, control system switch outage when ambient temperature is higher to power consumption control module and power consumption system outage reach the technological effect of protection power consumption system device.

The specific circuit of the comparison start module can be as shown in fig. 9, where fig. 9 shows the comparison start module and the comparison module power switch, the comparison start module includes a capacitor C1 and a resistor R3, the capacitor C1 and the resistor R3 are connected in series between the power supply and GND, when the circuit is connected to the power supply for the first time, as the capacitor C1 is charged, the point between C1 and the resistor R3 will be briefly changed to high level, that is, the CONTROL network voltage is high level at the moment of power-on.

Based on the solution provided by the foregoing embodiment, optionally, as shown in fig. 9, the comparing module power switch includes a resistor R1, a resistor R2, a P-MOS transistor Q1, and an N-MOS transistor Q2, and a gate of the N-MOS transistor Q2 is electrically connected to the comparing and starting module to receive a high-level starting instruction sent by the comparing and starting module;

the first end of the P-MOS transistor Q1 is electrically connected to the power supply through the resistor R1, the first end of the N-MOS transistor Q2 is electrically connected to the gate of the P-MOS transistor Q1, and the gate of the N-MOS transistor Q2 is electrically connected to the second end of the P-MOS transistor Q1 through the resistor R2.

The power switch of the comparison module provided by the embodiment includes resistors R1 and R2, a P-MOS transistor Q1, and an N-MOS transistor Q2. The CONTROL network voltage is high at the instant the power is turned on, driving Q2 on. The Q2 turn-on instant pulls the Q1 gate voltage low so that Q1 is turned on again. The supply voltage flowing through Q1 pulls the gate voltage of Q2 high through resistor R2 after Q1 is turned on, and the comparator power switching circuit becomes self-locking, maintaining the on state of the comparator power path.

Based on the solutions provided by the above embodiments, optionally, fig. 10 provides a circuit schematic diagram of a low-power consumption high-temperature protection circuit. The power supply, the comparison starting module, the comparison module power switch, the comparison module, the system power switch, the power utilization control module and the power utilization system are included. Since each module and the corresponding circuit device have been described one by one in the above example, no further description is given here.

The embodiment of the application provides a low-power-consumption high-temperature protection circuit, which can play a role in protecting a power utilization system in low-power-consumption power management and high-temperature environments.

After a high-temperature battery in the circuit is electrified, the comparison starting module can automatically trigger a high-level starting signal after a power supply is electrified, and the duration time of the signal can be adjusted by adjusting the parameters of an original. A short high-level starting signal is automatically triggered by the comparison starting module to be sent to the comparison module power switch. After the comparison module power switch obtains the high-level starting signal, the comparison module power switch can be turned on to supply power to the comparison module. The self-locking circuit can maintain the on state of the power switch of the comparison module and continuously supply power to the comparison module.

The voltage of the second temperature detection module in the comparison module changes along with the change of the temperature, and the temperature change is inversely proportional to the voltage change. The second temperature detection module outputs a current voltage according to the current environmental temperature, and the current voltage is compared with a fixed voltage (a voltage corresponding to a second preset temperature) set by the comparison reference circuit through the comparator to output a corresponding switching signal. If the current environment temperature is lower than or equal to the set second preset temperature, the comparator outputs low voltage to open a system power switch; if the current environment temperature is higher than the set second preset temperature, the comparator outputs high voltage to keep the off state of the system power switch, so that the circuit of the rear-stage system is protected from being damaged by high temperature.

The system power switch provided by the embodiment has a self-locking function, and once the self-locking circuit is opened, the self-locking circuit can maintain the opening state to supply power to the power utilization control module and the power utilization system. The MCU works in a timing awakening standby mode, the MCU can run at certain time intervals in a circulating mode, and the functions of running when the MCU is awakened comprise but not limited to temperature detection and control signals of an IO output comparator power supply switching circuit.

When the MCU detects that the ambient temperature is lower than a first preset temperature stored in the MCU, the corresponding IO pin of the MCU outputs a low level signal to control the power switch of the comparison module to be turned off, so that the comparison module is powered off and stops working, and the effect of reducing power consumption is achieved. When the MCU detects that the ambient temperature exceeds a first preset temperature stored in the MCU, a corresponding IO pin of the MCU outputs a high-level signal to control a power switch of the comparison module to be switched on, so that the comparison module is electrified to work. When the comparison module detects that the ambient temperature is higher than the second preset temperature, the comparison module can close the system power switch, the power utilization control module and the power utilization system are powered off, and the effect of protecting a system circuit and key components under the high-temperature condition is achieved.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A low power consumption high temperature protection circuit, comprising:

a control output end of the electricity utilization control module is in communication connection with a control input end of the comparison module power switch, the electricity utilization control module is used for controlling the comparison module power switch to be closed when the ambient temperature is higher than a first preset temperature and controlling the comparison module power switch to be opened when the ambient temperature is lower than or equal to the first preset temperature, an electric output end of the electricity utilization control module is electrically connected with an electric input end of an electricity utilization system, and the electricity utilization control module is used for supplying electricity to the electricity utilization system after being electrified;

the electrical output end of the comparison module power switch is electrically connected with the electrical input end of the comparison module, and the comparison module power switch is used for supplying power to the comparison module when the comparison module power switch is closed;

2. The circuit of claim 1, wherein the power consumption control module comprises:

the multipoint control unit MCU is used for comparing a first environment temperature with a first preset temperature, sending a closing signal to the comparison module power switch when the first environment temperature is higher than the first preset temperature, and sending an opening signal to the comparison module power switch when the first environment temperature is lower than or equal to the first preset temperature;

and the first temperature detection module is in communication connection with the multipoint control unit and is used for sending the detected environment temperature to the multipoint control unit as a first environment temperature.

3. The circuit of claim 2, wherein the power consumption control module operates based on a preset time period periodicity;

4. The circuit of claim 2 or 3, wherein the first temperature detection module is configured to generate a first ambient temperature voltage according to the detected ambient temperature and send the first ambient temperature voltage to the multipoint control unit, wherein the ambient temperature detected by the first temperature detection module is inversely related to the first ambient temperature voltage;

5. The circuit of claim 1, wherein the comparison module comprises:

the comparator is used for comparing a second environment temperature with a second preset temperature and sending a disconnection signal to the system power switch to stop supplying power to the power utilization control module and the power utilization system when the second environment temperature is higher than the second preset temperature;

and the second temperature detection module is in communication connection with the comparator and is used for sending the detected environment temperature to the comparator as a second environment temperature.

6. The circuit of claim 5, wherein the comparison module further comprises:

the comparison reference circuit is in communication connection with the first input end of the comparator and is used for generating a second preset temperature voltage and sending the second preset temperature voltage to the comparator, wherein the second preset temperature voltage is in negative correlation with the second preset temperature;

the second temperature detection module is in communication connection with a second input end of the comparator, and is configured to generate a second ambient temperature voltage according to the detected ambient temperature and send the second ambient temperature voltage to the comparator, where the ambient temperature detected by the second temperature detection module is negatively correlated with the second ambient temperature voltage;

and the comparator is used for comparing the second environment temperature voltage with the second preset temperature voltage, and sending a disconnection signal to the system power switch when the second environment temperature voltage is smaller than the second preset temperature voltage so as to stop supplying power to the power utilization control module and the power utilization system.

7. The circuit as claimed in claim 6, wherein the comparison reference circuit comprises a resistor R8 and a resistor R12, the second temperature detection module comprises a resistor R7 and a thermistor R11, the resistor R7 and the resistor R8 have equal resistance values, the resistance value of the thermistor R11 is inversely related to the ambient temperature, and the resistance value of the resistor R12 corresponds to the second preset temperature;

8. The circuit as claimed in any one of claims 5 to 7, wherein the system power switch comprises a resistor R5, a resistor R6, a resistor R9, a resistor R10, a P-MOS transistor Q3, an N-MOS transistor Q4 and a capacitor C3;

a second end of the N-MOS transistor Q4 is connected to the second end of the capacitor C3 and to ground, and a first end of the capacitor C3 is electrically connected to the gate of the P-MOS transistor Q3 and the second end of the resistor R10;

9. The circuit of claim 1, further comprising:

and the electrical input end of the comparison starting module is electrically connected with the electrical output end of the power supply, and the control output end of the comparison starting module is in communication connection with the control input end of the comparison module power switch and used for sending a starting instruction to the comparison module power switch after the power supply is powered on so as to indicate that the comparison module power switch is closed.

10. The circuit as claimed in claim 9, wherein the comparing module power switch includes a resistor R1, a resistor R2, a P-MOS transistor Q1 and an N-MOS transistor Q2, and a gate of the N-MOS transistor Q2 is electrically connected to the comparing start module to receive the high-level start instruction sent by the comparing start module;