Over-temperature dormancy control circuit

Abstract

The invention provides an over-temperature dormancy control circuit which comprises an over-temperature detection module, a dormancy control module and an inversion control module, the output end of the over-temperature detection module is connected to the input end of the dormancy control module, and the output end of the dormancy control module is connected to the power supply on-off control end of the inversion control module. And the power supply end of the inversion control module is connected to a given power supply. Through over-temperature detection and dormancy control, the whole over-temperature protection circuit has over-temperature dormancy capability, and can actively recover work when the temperature returns to normal, so that the system is prevented from being frequently restarted or entering an abnormal state.

Description

Technical Field

[0001] The present application relates to the technical field of circuit over-temperature protection, and in particular to an over-temperature sleep control circuit. Background Art

[0002] When a traditional over-temperature protection circuit detects over-temperature, it usually cuts off the power supply directly without the function of entering sleep mode, that is, it cannot start after the temperature returns to normal. This not only fails to effectively reduce power consumption, but may also cause the system to restart frequently or enter an abnormal state. Although some high-precision temperature protection schemes can achieve adjustable thresholds and fast response, they are often complex in structure and costly, and are not suitable for widespread use in ordinary electronic equipment. Summary of the invention

[0003] In view of this, the purpose of the present application is to provide at least one over-temperature sleep control circuit, which, through over-temperature detection and sleep control, enables the entire over-temperature protection circuit to have the ability of over-temperature sleep, and can actively resume work when the temperature returns to normal, thereby avoiding frequent system restarts or entering abnormal states.

[0004] This application mainly includes the following aspects:

[0005] In the first aspect, an embodiment of the present application provides an over-temperature sleep control circuit, which includes an over-temperature detection module, a sleep control module and an inverter control module, wherein the output end of the temperature detection module is connected to the input end of the sleep control module, the output end of the sleep control module is connected to the power on / off control end of the inverter control module, and the power supply end of the inverter control module is connected to a given power supply.

[0006] In a possible embodiment, the overtemperature detection module includes a first voltage divider unit, a second voltage divider unit and a comparison unit, wherein the first connection end of the first voltage divider unit is connected to the first power supply, the second connection end of the first voltage divider unit is grounded, and the third connection end of the first voltage divider unit is connected to the negative input end of the comparison unit; the first connection end and the second connection end of the second voltage divider unit are grounded, the third connection end of the second voltage divider unit is connected to the first power supply, and the fourth connection end of the second voltage divider unit is connected to the positive input end of the comparison unit; the output end of the comparison unit is connected to the input end of the sleep control module.

[0007] In a possible implementation, the first voltage divider unit includes a photoresistor and a first voltage divider component, wherein one end of the photoresistor is connected to the first power supply, the other end of the photoresistor is respectively connected to one end of the first voltage divider component and the negative input end of the comparison unit, and the other end of the first voltage divider component is grounded.

[0008] In a possible embodiment, the second voltage divider unit includes a sliding rheostat and a second voltage divider component, wherein the first fixed end of the sliding rheostat is grounded, the second fixed end of the sliding rheostat is respectively connected to the positive input end of the comparison unit and one end of the second voltage divider component, the sliding end of the sliding rheostat is connected to the first power supply, and the other end of the second voltage divider component is grounded.

[0009] In a possible implementation, the comparison unit includes a comparator, a first current limiting component and an over-temperature prompt component, wherein the positive input terminal of the comparator is connected to one end of the second voltage dividing component in the second voltage dividing unit, the negative input terminal of the comparator is connected to one end of the first voltage dividing component in the first voltage dividing unit, and the output terminal of the comparator is connected to the input terminal of the sleep control module; the positive power supply input terminal of the comparator is respectively connected to the first power supply and one end of the first current limiting component, the other end of the first current limiting component is connected to one end of the over-temperature prompt component, the other end of the over-temperature prompt component is respectively connected to the output terminal of the comparator and the input terminal of the sleep control module, and the negative power supply input terminal of the comparator is grounded.

[0010] In a possible embodiment, the sleep control module includes a first switch control unit, an optocoupler isolation device and a second switch control unit, wherein the first connection end of the first switch control unit is connected to the output end of the comparator in the comparison unit, the second connection end of the first switch control unit is connected to the first power supply, the third connection end of the first switch control unit is connected to the first connection end of the optocoupler isolation device, the fourth connection end of the first switch control unit is respectively connected to the second connection end and the ground of the optocoupler isolation device, the third connection end of the optocoupler isolation device is grounded, the fourth connection end of the optocoupler isolation device is connected to the input end of the second switch control unit, and the output end of the second switch control unit is connected to the power on / off control end of the inverter control module.

[0011] In a possible implementation, the first switch control unit includes a second current limiting component, a third current limiting component and a first control switch, wherein one end of the second current limiting component is connected to the output end of the comparator, the other end of the second current limiting component is connected to the control end of the first control switch, one end of the third current limiting component is connected to the first power supply, the other end of the third current limiting component is respectively connected to the first connection end of the first control switch and the first connection end of the optocoupler isolation device, and the second connection end of the first control switch is respectively connected to the second connection end of the optocoupler isolation device and the ground.

[0012] In a possible implementation, the second switch control unit includes a fourth current limiting component, a drive component, a current flow limiting component, a fifth current limiting component, an energy discharge component, an anti-mis-turn-on component and a second control switch, wherein one end of the fourth current limiting component is connected to one end of the second power supply, the other end of the fourth current limiting component is respectively connected to one end of the drive component, one end of the fifth current limiting component and one end of the anti-mis-turn-on component, the other end of the drive component is connected to one end of the current flow limiting component, and the other end of the current flow limiting component is connected to the control end of the second control switch; the other end of the fifth current limiting component is connected to the first connection end of the energy discharge component, the second connection end of the energy discharge component is connected to the control end of the second control switch, and the third connection end of the energy discharge component is connected to the other end of the anti-mis-turn-on component and ground; the first connection end of the second control switch is connected to the power supply on-off control end of the inverter control module, and the second connection end of the second control switch is grounded.

[0013] In a possible implementation, the energy discharge component includes a third control switch and a discharge load, wherein the control end of the third control switch is connected to the other end of the fifth current limiting component, the first connection end of the third control switch is connected to one end of the discharge load, the other end of the discharge load is grounded, and the second connection end of the third control switch is connected to the control end of the second control switch.

[0014] In a possible embodiment, the inverter control module includes an inverter control unit and a filtering and voltage stabilizing unit, wherein one end of the inverter control unit is connected to a first connection end of the second control switch, the second connection end of the inverter control unit is respectively connected to one end of the filtering and voltage stabilizing unit and a given power supply, and the other end of the filtering and voltage stabilizing unit is grounded.

[0015] The embodiment of the present application provides an over-temperature sleep control circuit, including an over-temperature detection module, a sleep control module and an inverter control module, wherein the output end of the temperature detection module is connected to the input end of the sleep control module, the output end of the sleep control module is connected to the power supply on-off control end of the inverter control module, and the power supply end of the inverter control module is connected to a given power supply. Through over-temperature detection and sleep control, the entire over-temperature protection circuit has the ability of over-temperature sleep, and can actively resume work when the temperature returns to normal, avoiding frequent restarts of the system or entering an abnormal state.

[0016] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 One of the structural schematic diagrams of an over-temperature sleep control circuit provided in an embodiment of the present application is shown;

[0019] Figure 2 One of the structural schematic diagrams of an over-temperature detection module provided in an embodiment of the present application is shown;

[0020] Figure 3 A second structural schematic diagram of an over-temperature detection module provided in an embodiment of the present application is shown;

[0021] Figure 4 One of the structural schematic diagrams of a sleep control module provided in an embodiment of the present application is shown;

[0022] Figure 5 A second structural diagram of a sleep control module provided in an embodiment of the present application is shown;

[0023] Figure 6 A second structural schematic diagram of an over-temperature sleep control circuit provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0024] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of explanation and description and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn in real proportion. The flowchart used in this application shows the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowchart can be implemented out of sequence, and the steps without logical context can be reversed in order or implemented simultaneously. In addition, those skilled in the art, under the guidance of the content of the present application, can add one or more other operations to the flowchart, or remove one or more operations from the flowchart.

[0025] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0026] In modern electronic devices, temperature control and protection are one of the key factors to ensure stable operation of the system. Excessive temperature will not only cause the performance of components to deteriorate, but may also cause permanent damage, thus affecting the normal operation of the entire system. Therefore, an effective over-temperature protection mechanism is crucial to improving the reliability and safety of electronic equipment.

[0027] When a traditional over-temperature protection circuit detects over-temperature, it usually cuts off the power supply directly without the function of entering sleep mode, that is, it cannot start after the temperature returns to normal. This not only fails to effectively reduce power consumption, but may also cause the system to restart frequently or enter an abnormal state. Although some high-precision temperature protection schemes can achieve adjustable thresholds and fast response, they are often complex in structure and costly, and are not suitable for widespread use in ordinary electronic equipment.

[0028] Based on this, the embodiment of the present application provides an over-temperature sleep control circuit. Through over-temperature detection and sleep control, the entire over-temperature protection circuit has the ability of over-temperature sleep, and can actively resume work when the temperature returns to normal, avoiding frequent restarts of the system or entering an abnormal state. The details are as follows:

[0029] See also Figure 1 , Figure 1 FIG. 1 shows one of the structural schematic diagrams of an over-temperature sleep control circuit provided in an embodiment of the present application. Figure 1 As shown, the over-temperature sleep control circuit provided in the embodiment of the present application includes an over-temperature detection module 1, a sleep control module 2 and an inverter control module 3, wherein the output end of the temperature detection module 1 is connected to the input end of the sleep control module 2, the output end of the sleep control module 2 is connected to the power supply on-off control end of the inverter control module 3, and the power supply end of the inverter control module 3 is connected to a given power supply VCC1.

[0030] See also Figure 2 , Figure 2 FIG. 1 shows one of the structural diagrams of an over-temperature detection module provided in an embodiment of the present application. Figure 2As shown, the overtemperature detection module 1 includes a first voltage dividing unit 11, a second voltage dividing unit 12 and a comparison unit 13, wherein the first connection end of the first voltage dividing unit 11 is connected to the first power supply VCC2, the second connection end of the first voltage dividing unit 11 is grounded GND, the third connection end of the first voltage dividing unit 11 is connected to the negative input end of the comparison unit 13, the first connection end and the second connection end of the second voltage dividing unit 12 are grounded GND, the third connection end of the second voltage dividing unit 12 is connected to the first power supply VCC2, the fourth connection end of the second voltage dividing unit 12 is connected to the positive input end of the comparison unit 13, and the output end of the comparison unit 13 is connected to the input end of the sleep control module 2.

[0031] See also Figure 3 , Figure 3 FIG2 shows a second structural diagram of an over-temperature detection module provided in an embodiment of the present application. Figure 3 As shown, the first voltage divider unit 11 includes a photoresistor R-NCT and a first voltage divider component 110, wherein one end of the photoresistor R-NCT is connected to the first power supply VCC2, the other end of the photoresistor R-NCT is respectively connected to one end of the first voltage divider component 110 and the negative input end of the comparison unit 13, and the other end of the first voltage divider component 110 is grounded GND.

[0032] like Figure 3 As shown, the second voltage-dividing unit 12 includes a sliding resistor RN and a second voltage-dividing component 120, wherein the first fixed end of the sliding resistor RN is grounded GND, the second fixed end of the sliding resistor RN is respectively connected to the positive input end of the comparison unit 13 and one end of the second voltage-dividing component 120, the sliding end of the sliding resistor RN is connected to the first power supply VCC2, and the other end of the second voltage-dividing component 120 is grounded GND.

[0033] like Figure 3 As shown, the comparison unit 13 includes a comparator U1, a first current limiting component 130 and an over-temperature prompt component 131. Specifically, the positive input terminal of the comparator U1 is respectively connected to one end of the second voltage dividing component 120 and the second fixed end of the sliding rheostat RN, the negative input terminal of the comparator U1 is respectively connected to one end of the first voltage dividing component 111 and the other end of the thermistor R-NCT, the output terminal of the comparator U1 is connected to the input terminal of the sleep control module 2, the positive power input terminal of the comparator U1 is respectively connected to the first power supply VCC2 and one end of the first current limiting component 130, the other end of the first current limiting component 130 is connected to one end of the over-temperature prompt component 131, the other end of the over-temperature prompt component 131 is respectively connected to the output terminal of the comparator U2 and the input terminal of the sleep control module 2, and the negative power input terminal of the comparator U1 is grounded GND.

[0034] See also Figure 4 , Figure 4 FIG. 1 shows one of the structural diagrams of a sleep control module provided in an embodiment of the present application. Figure 4 As shown, the sleep control module 2 includes a first switch control unit 21, an optocoupler isolation device U2 and a second switch control unit 22, wherein the first connection end of the first switch control unit 21 is connected to the output end of the comparator U2, the second connection end of the first switch control unit 21 is connected to the first power supply VCC1, the third connection end of the first switch control unit 21 is connected to the first connection end of the optocoupler isolation device U2, the fourth connection end of the first switch control unit 21 is respectively connected to the second connection end and the ground GND of the optocoupler isolation device U2, the third connection end of the optocoupler isolation device U2 is grounded GND, the fourth connection end of the optocoupler isolation device U2 is connected to the input end of the second switch control unit 22, and the output end of the second switch control unit 22 is connected to the power on / off control end of the inverter control module.

[0035] See also Figure 5 , Figure 5 FIG. 2 shows a second structural diagram of a sleep control module provided in an embodiment of the present application. Figure 5 As shown, the first switch control unit 21 includes a second current limiting component 210, a third current limiting component 211 and a first control switch K1, wherein one end of the second current limiting component 210 is connected to the output end of the comparator U1, the other end of the second current limiting component 210 is connected to the control end of the first control switch K1, one end of the third current limiting component 211 is connected to the first power supply VCC2, the other end of the third current limiting component 211 is respectively connected to the first connection end of the first control switch K1 and the first connection end of the optocoupler isolation device U2, and the second connection end of the first control switch K1 is respectively connected to the second connection end of the optocoupler isolation device U2 and the ground GND.

[0036] like Figure 5As shown, the second switch control unit 22 includes a fourth current limiting component 220, a driving component 221, a current flow limiting component 222, a fifth current limiting component 223, an energy discharge component 224, an anti-misleading turn-on component 225 and a second control switch K2, wherein one end of the fourth current limiting component 220 is connected to one end of the second power supply VCC3, the other end of the fourth current limiting component 220 is respectively connected to one end of the driving component 221, one end of the fifth current limiting component 223 and one end of the anti-misleading turn-on component 225, the other end of the driving component 221 is connected to one end of the current flow limiting component 222, the other end of the current flow limiting component 222 is connected to the control end of the second control switch K2, the other end of the fifth current limiting component 223 is connected to the first connection end of the energy discharge component 224, the second connection end of the energy discharge component 224 is connected to the control end of the second control switch K2, and the third connection end of the energy discharge component 224 is connected to the other end of the anti-misleading turn-on component 225 and the ground GND.

[0037] A first connection end of the second control switch K2 is connected to a power supply on / off control end of the inverter control module 3 , and a second connection end of the second control switch K2 is grounded GND.

[0038] In a preferred embodiment, the energy discharge component 224 includes a third control switch K3 and a discharge load 2240, wherein the control end of the third control switch K3 is connected to the other end of the fifth current limiting component 223, the first connection end of the third control switch K3 is connected to one end of the discharge load 2240, the other end of the discharge load 2240 is grounded, and the second connection end of the third control switch K3 is connected to the control end of the second control switch K2.

[0039] like Figure 5 As shown, the inverter control module 3 includes an inverter control unit 30 and a filtering and voltage stabilizing unit 31, wherein one end of the inverter control unit 30 is connected to a first connection end of the second control switch K2, and a second connection end of the inverter control unit 30 is respectively connected to one end of the filtering and voltage stabilizing unit 31 and a given power supply VCC1, and the other end of the filtering and voltage stabilizing unit 31 is grounded GND.

[0040] In one specific embodiment, see Figure 6 , Figure 6 FIG2 shows a second structural diagram of an over-temperature sleep control circuit provided by an embodiment of the present application. Figure 6As shown, the first voltage dividing component 111 uses the first resistor R1, the second voltage dividing component 120 uses the second resistor R2, the first current limiting component 130 uses the third resistor R3, the over-temperature prompt component uses the light-emitting diode LED1, the second current limiting component 210 uses the fourth resistor R4, the third current limiting component 211 uses the fifth resistor R5, the first control switch K1 uses the NPN transistor, the fourth current limiting component 220 uses the sixth resistor R6, the driving component 221 uses the seventh resistor R7, the current flow limiting component 222 can use the first diode D1, and the fifth current limiting component 22 The eighth resistor R8 is selected, the mis-conduction prevention component 225 is selected from the ninth resistor R9, the second control switch K2 is selected from the N-type field effect transistor, the discharge load 2240 is selected from the tenth resistor R10, the third control switch K3 is selected from the PNP transistor, and the inverter control unit 30 is selected from the H-bridge inverter drive control circuit. Specifically, the H-bridge inverter drive control circuit includes a first drive switch Q1, a second drive switch Q2, a third drive switch Q3, a fourth drive switch Q4, an inductor L1 and a load resistor R11, the filter and voltage stabilization unit is selected from the capacitor C1, and Q1-Q4 are selected from the N-type field effect transistor.

[0041] like Figure 6 As shown, one end of the photoresistor R-NCT is connected to the first power supply VCC2, the other end of the photoresistor R-NCT is respectively connected to the negative input end of the comparator U1 and one end of the first resistor, and the other end of the first resistor is grounded.

[0042] The first fixed end of the sliding resistor RN is grounded, the sliding end of the sliding resistor RN is connected to the first power supply VCC2, the second fixed end of the sliding resistor RN is respectively connected to the positive input end of the comparator U1 and one end of the second resistor R2, and the other end of the second resistor R2 is grounded.

[0043] The positive power input terminal of the comparator U1 is respectively connected to one end of the third resistor R3 and the second power supply VCC2, the negative power input terminal of the comparator U1 is grounded, the other end of the third resistor R3 is connected to the anode of the light emitting diode LED1, and the cathode of the light emitting diode LED1 is connected to the output terminal of the comparator U1 and one end of the fourth resistor R4.

[0044] The other end of the fourth resistor R4 is connected to the base of the first control switch K1. One end of the fifth resistor R5 is connected to the first power supply VCC2, and the other end of the fifth resistor R5 is connected to the collector of the first control switch K1 and the first connection end of the opto-isolation device U2. The emitter of the first control switch K1 is respectively connected to the second connection end of the opto-isolation device U2 and the ground. The third connection end of the opto-isolation device U2 is grounded to GND. One end of the sixth resistor R6 is connected to the second power supply VCC2, and the other end of the sixth resistor R6 is respectively connected to the fourth connection end of the opto-isolation device U2, one end of the seventh resistor R7, one end of the eighth resistor R8, and one end of the ninth resistor R9.

[0045] The other end of the seventh resistor R7 is connected to the anode of the first diode D1. The cathode of the first diode D1 is connected to the gate of the second control switch K2. The other end of the eighth resistor R8 is connected to the base of the third control switch K3. The emitter of the third control switch K3 is connected to the gate of the second control switch K2. The collector of the third control switch K3 is connected to one end of the tenth resistor R10. The other end of the tenth resistor R10 is connected to the ground after being connected to the other end of the ninth resistor R9 and the source of the second control switch K2 respectively.

[0046] The drains of the first drive switch Q1 and the third drive switch Q3 are connected and then respectively connected to one end of the capacitor C1 and the given power supply VCC1. The other end of the capacitor C1 is grounded. The source of the first drive switch Q1 is respectively connected to the drain of the second drive switch Q2 and one end of the inductor L1. The other end of the inductor L1 is connected to one end of the load resistor R11. The source of the third drive switch Q3 is respectively connected to the other end of the load resistor R11 and the drain of the fourth drive switch Q4. The sources of the second drive switch Q2 and the fourth drive switch Q4 are connected and then connected to the drain of the second control switch K2.

[0047] The gates of Q1~Q4 are respectively connected to the PWM pins of the controller.

[0048] In the above circuit, the thermistor R-NCT is arranged at the positions where power devices such as power transistors and loads in the entire over-temperature sleep control circuit need to be temperature-controlled. The resistance value of the thermistor R-NCT decreases as the temperature rises. The specific rising and falling ranges are different for different models of thermistors. For example, the resistance value of a certain model of thermistor R-NCT is 10 KΩ at room temperature of 25 °C and 0.7 KΩ at a temperature of 100 °C.

[0049] The thermistor R-NCT and the first resistor R1 form a voltage-dividing network, and the negative input voltage V- corresponding to the comparator U2 is determined by the resistance values of the thermistor R-NCT and R1:

[0050] V- = (VCC2 × R1) / (R-NCT + R1)

[0051] The change in temperature of the entire over-temperature sleep control circuit causes the resistance value of the thermistor R-NCT to change, thereby causing the change in the negative input voltage V- corresponding to the comparator U1.

[0052] The sliding rheostat RN and the second resistor R2 form a voltage divider network. By changing the sliding end position of the sliding rheostat RN, the connected resistance value is adjusted, thereby adjusting the positive input voltage V+ of the comparator U1:

[0053] V+=(VCC2×R2) / (RN+R2)

[0054] The third resistor R3 limits the current flowing through the light emitting diode LED1. The light emitting diode LED1 is not lit when the comparator U1 outputs a high level, and is lit when the comparator U1 outputs a low level.

[0055] The fourth resistor R4 limits the current of the base of the first control switch K1 , and the fifth resistor R5 limits the current of the light emitting diode inside the optocoupler isolation device U2 .

[0056] The sixth resistor R6 limits the current between the second power supply VCC2 and the ground GND to prevent the second power supply VCC2 from being directly grounded after the optocoupler isolation device U2 is turned on.

[0057] The ninth resistor R9 is the driving resistor of the second control switch K2. The first diode D2 limits the current flow to prevent reverse current from flowing. The third control switch K3 and the tenth resistor R10 form a current path of the gate when the second control switch K2 is turned off, forming a discharge circuit, which can quickly consume the remaining energy when the second control switch K2 is turned off.

[0058] The eighth resistor R8 limits the current of the base of the second control switch K2.

[0059] The ninth resistor R9 prevents the source of the second control switch K2 and the optical coupling isolation device U2 from being mis-conducted, and the capacitor C1 performs filtering and voltage stabilization processing on the given input power VCC1.

[0060] The working process of the over-temperature sleep control circuit provided in this application is as follows:

[0061] Before the over-temperature sleep control circuit works, the sliding resistor RN is adjusted according to actual needs to obtain a set temperature protection threshold.

[0062] When the over-temperature sleep control circuit works normally:

[0063] When the operating temperature of the warm sleep control circuit is lower than the set temperature protection threshold, the positive input voltage of the comparator U1 is higher than the negative input voltage, the comparator U1 outputs a high level, the light-emitting diode LED1 is not turned on, the first control switch K1 is turned on, the light-emitting diode in the optocoupler isolation device U2 is not turned on, the optocoupler isolation device U2 is not turned on, the second power supply VCC3 supplies power to the gate of the second control switch K2, the second control switch K2 is turned on, the H bridge is connected to GND, and the entire circuit works normally.

[0064] Over-temperature sleep control circuit over-temperature:

[0065] The operating temperature of the over-temperature sleep control circuit is greater than the threshold protection temperature, the positive input voltage of the comparator U1 is less than the negative input voltage, the comparator U1 outputs a low level, the light-emitting diode LED1 is turned on to emit a light alarm, the first control switch K1 is not turned on, the light-emitting diode in the optocoupler isolation device U2 is turned on, the optocoupler isolation device U2 is turned on, the second power supply VCC3 power supply is pulled down and connected to GND, the gate voltage of the second control switch K2 is low, the second control switch K2 is not turned on, the connection between the H bridge and the ground GND is disconnected, the loop no longer has current, and the load resistor R11 cannot get the correct power supply until the circuit temperature returns to normal, and the entire circuit automatically resumes work, realizing load sleep under high temperature conditions.

[0066] The benefits of this application are:

[0067] 1) By introducing a sliding rheostat to adjust the reference voltage of the comparator U1, the temperature protection threshold can be flexibly adjusted, which enables the circuit to adapt to different application scenarios and requirements.

[0068] 2) A photoresistor is introduced. When overtemperature is detected, the negative input voltage of the comparator U1 changes with the photoresistor, and the entire overtemperature sleep control circuit automatically enters sleep mode and cuts off the loop to reduce power consumption and avoid frequent restarts. This not only improves the stability of the system, but also reduces the risk of component damage caused by overtemperature. After the temperature returns to normal, the system can quickly recover from sleep mode to normal working state to ensure the continuity and stability of the system.

[0069] 3) The introduction of photoresistors enables the comparator to respond to temperature changes in a short time and take protective measures quickly, which helps prevent components from being damaged by high temperatures and improves the safety of the equipment.

[0070] 4) Compared with complex and expensive high-precision temperature protection solutions, this design significantly reduces costs while ensuring performance. Especially in battery-powered devices, the low power consumption and energy-saving characteristics of this application meet their key needs and have a high cost-effectiveness.

[0071] 5) The sleep function of this design significantly extends battery life and improves user experience.

[0072] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. In the several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0073] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0074] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0075] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc., various media that can store program codes.

[0076] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An over-temperature sleep control circuit, characterized in that: The over-temperature sleep control circuit includes an over-temperature detection module, a sleep control module and an inverter control module. The output end of the temperature detection module is connected to the input end of the sleep control module, the output end of the sleep control module is connected to the power on / off control end of the inverter control module, and the power supply end of the inverter control module is connected to a given power supply.

2. The over-temperature sleep control circuit according to claim 1, characterized in that: The over-temperature detection module includes a first voltage dividing unit, a second voltage dividing unit and a comparison unit. Wherein, the first connection end of the first voltage dividing unit is connected to the first power supply, the second connection end of the first voltage dividing unit is grounded, and the third connection end of the first voltage dividing unit is connected to the negative input end of the comparison unit; The first connection end and the second connection end of the second voltage dividing unit are grounded, the third connection end of the second voltage dividing unit is connected to the first power supply, and the fourth connection end of the second voltage dividing unit is connected to the positive input end of the comparison unit; The output end of the comparison unit is connected to the input end of the sleep control module.

3. The over-temperature sleep control circuit according to claim 2, characterized in that: The first voltage dividing unit includes a photoresistor and a first voltage dividing component. One end of the photoresistor is connected to the first power supply, the other end of the photoresistor is respectively connected to one end of the first voltage divider component and the negative input end of the comparison unit, and the other end of the first voltage divider component is grounded.

4. The over-temperature sleep control circuit according to claim 2, characterized in that: The second voltage dividing unit includes a sliding rheostat and a second voltage dividing component. Among them, the first fixed end of the sliding rheostat is grounded, the second fixed end of the sliding rheostat is respectively connected to the positive input end of the comparison unit and one end of the second voltage divider component, the sliding end of the sliding rheostat is connected to the first power supply, and the other end of the second voltage divider component is grounded.

5. The over-temperature sleep control circuit according to claim 2, characterized in that: The comparison unit includes a comparator, a first current limiting component and an over-temperature prompt component. The positive input terminal of the comparator is connected to one end of the second voltage-dividing component in the second voltage-dividing unit, the negative input terminal of the comparator is connected to one end of the first voltage-dividing component in the first voltage-dividing unit, and the output terminal of the comparator is connected to the input terminal of the sleep control module; The positive power input terminal of the comparator is respectively connected to the first power supply and one end of the first current limiting component, the other end of the first current limiting component is connected to one end of the over-temperature prompt component, the other end of the over-temperature prompt component is respectively connected to the output terminal of the comparator and the input terminal of the sleep control module, and the negative power input terminal of the comparator is grounded.

6. The over-temperature sleep control circuit according to any one of claims 2 to 5, characterized in that: The sleep control module includes a first switch control unit, an optocoupler isolation device and a second switch control unit. The first connection end of the first switch control unit is connected to the output end of the comparator in the comparison unit, the second connection end of the first switch control unit is connected to the first power supply, the third connection end of the first switch control unit is connected to the first connection end of the optocoupler isolation device, and the fourth connection end of the first switch control unit is connected to the second connection end of the optocoupler isolation device and the ground respectively. The third connection end of the optocoupler isolation device is grounded, the fourth connection end of the optocoupler isolation device is connected to the input end of the second switch control unit, and the output end of the second switch control unit is connected to the power supply on-off control end of the inverter control module.

7. The over-temperature sleep control circuit according to claim 6, characterized in that: The first switch control unit includes a second current limiting component, a third current limiting component and a first control switch, Among them, one end of the second current limiting component is connected to the output end of the comparator, the other end of the second current limiting component is connected to the control end of the first control switch, one end of the third current limiting component is connected to the first power supply, the other end of the third current limiting component is respectively connected to the first connection end of the first control switch and the first connection end of the optocoupler isolation device, and the second connection end of the first control switch is respectively connected to the second connection end of the optocoupler isolation device and ground.

8. The over-temperature sleep control circuit according to claim 6, characterized in that: The second switch control unit includes a fourth current limiting component, a driving component, a current flow limiting component, a fifth current limiting component, an energy discharge component, an anti-misdirection switching component and a second control switch. Wherein, one end of the fourth current limiting component is connected to one end of the second power supply, the other end of the fourth current limiting component is respectively connected to one end of the driving component, one end of the fifth current limiting component and one end of the mis-conduction prevention component, the other end of the driving component is connected to one end of the current flow limiting component, and the other end of the current flow limiting component is connected to the control end of the second control switch; The other end of the fifth current limiting component is connected to the first connection end of the energy discharge component, the second connection end of the energy discharge component is connected to the control end of the second control switch, and the third connection end of the energy discharge component is connected to the other end of the mis-conduction prevention component and the ground; A first connection end of the second control switch is connected to a power supply on-off control end of the inverter control module, and a second connection end of the second control switch is grounded.

9. The over-temperature sleep control circuit according to claim 8, characterized in that: The energy discharge component includes a third control switch and a discharge load, Among them, the control end of the third control switch is connected to the other end of the fifth current limiting component, the first connection end of the third control switch is connected to one end of the discharge load, the other end of the discharge load is grounded, and the second connection end of the third control switch is connected to the control end of the second control switch.

10. The over-temperature sleep control circuit according to claim 8, characterized in that: The inverter control module includes an inverter control unit and a filter voltage stabilization unit. Among them, one end of the inverter control unit is connected to the first connection end of the second control switch, the second connection end of the inverter control unit is respectively connected to one end of the filter and voltage stabilization unit and a given power supply, and the other end of the filter and voltage stabilization unit is grounded.

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