Control circuit of cooling fan and robot

Abstract

The utility model discloses a control circuit of a cooling fan and a robot, the cooling fan is used for cooling a target element, and the control circuit comprises a driving module which is connected with the cooling fan and is used for receiving a power supply voltage and a driving signal, converting the power supply voltage into a driving voltage according to the driving signal and outputting the driving voltage to the cooling fan; the sampling module is connected with a to-be-detected unit in the cooling fan and is used for sampling the detection voltage of the to-be-detected unit and outputting the detection voltage; the control module is connected with the driving module and the sampling module and used for determining the target rotating speed of the cooling fan, generating and outputting the driving signal according to the target rotating speed, receiving the detection voltage and adjusting the driving signal according to the detection voltage. The cooling fan can work at a proper rotating speed, so that the working efficiency of the cooling fan is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of device heat dissipation, in particular to a control circuit of a heat dissipation fan and a robot. BACKGROUND

[0002] At present, a heat dissipation fan is generally arranged in an electronic device with heat dissipation requirement, so as to reduce the temperature of a target element generating heat in the electronic device, thereby ensuring that the electronic device can normally operate and avoiding the problem of shutdown due to heat accumulation in the electronic device. However, the heat dissipation fan in the prior art has a relatively simple structure, and only has the functions of turning on and off, so that the working efficiency of the heat dissipation fan is low and the heat dissipation fan is prone to failure. CONTENT OF THE UTILITY MODEL

[0003] In view of this, the present application provides a control circuit of a heat dissipation fan and a robot, which are used to improve the working efficiency of the heat dissipation fan and reduce the probability of failure of the heat dissipation fan. The technical scheme of the present application is as follows:

[0004] The first aspect of the present application provides a control circuit of a heat dissipation fan, the heat dissipation fan being used for heat dissipation for a target element, the control circuit comprising: a driving module connected with the heat dissipation fan, used for receiving a power supply voltage and a driving signal, converting the power supply voltage into a driving voltage according to the driving signal and outputting the driving voltage to the heat dissipation fan; a sampling module connected with a to-be-tested unit in the heat dissipation fan, used for sampling a detection voltage of the to-be-tested unit and outputting the detection voltage; and a control module connected with the driving module and the sampling module, used for determining a target rotating speed of the heat dissipation fan, generating and outputting the driving signal according to the target rotating speed, and receiving the detection voltage and adjusting the driving signal according to the detection voltage.

[0005] In an embodiment of the present application, the control circuit further comprises an overvoltage identification module connected with the sampling module, used for receiving the detection voltage and outputting an overvoltage signal when it is determined that the detection voltage is greater than a preset voltage; and the control module is further used for stopping outputting the driving signal when the overvoltage signal is received.

[0006] In an embodiment of the present application, the driving module comprises a switching unit and a conversion unit, the switching unit being connected with the conversion unit; the switching unit is used for receiving the driving signal and converting the driving signal into a switching signal; and the conversion unit is used for receiving the switching signal, converting the power supply voltage into the driving voltage according to the switching signal and outputting the driving voltage to the heat dissipation fan.

[0007] In an embodiment of the present application, the switch unit comprises a first resistor, a second resistor and a transistor; the base of the transistor receives the driving signal through the first resistor and is grounded through the second resistor; the emitter of the transistor is grounded; and the collector of the transistor is connected to the conversion unit.

[0008] In an embodiment of the present application, the conversion unit comprises a first capacitor, a second capacitor, a third capacitor, a third resistor and a switch tube; the source of the switch tube receives the power supply voltage and is grounded through the first capacitor; the gate of the switch tube is connected to the source of the switch tube through the third resistor; the second capacitor is connected in parallel with the third resistor; and the drain of the switch tube is connected to the cooling fan and is grounded through the third capacitor.

[0009] In an embodiment of the present application, the sampling module comprises an amplification unit and a filtering unit; the amplification unit is connected to the unit to be measured; and the filtering unit is connected to the amplification unit; the amplification unit is configured to acquire the detection voltage of the unit to be measured and amplify the detection voltage by a preset multiple; and the filtering unit is configured to perform filtering processing on the detection voltage amplified by the preset multiple and transmit the detection voltage to the control module.

[0010] In an embodiment of the present application, the amplification unit comprises a first operational amplifier, a fourth resistor, a fifth resistor and a sixth resistor; the positive input end of the first operational amplifier is connected to the first end of the unit to be measured through the fourth resistor; the negative input end of the first operational amplifier is connected to the second end of the unit to be measured through the fifth resistor; the output end of the first operational amplifier is connected to the filtering unit; and the output end of the first operational amplifier is also connected to the negative input end through the sixth resistor.

[0011] In an embodiment of the present application, the first end of the unit to be measured is connected to the ground end of the cooling fan, the second end of the unit to be measured is connected to the system ground end, and the unit to be measured is a sampling resistor.

[0012] In an embodiment of the present application, the filtering unit comprises a seventh resistor and a fourth capacitor; the first end of the seventh resistor is connected to the amplification unit, and the second end of the seventh resistor is connected to the control module; and the second end of the seventh resistor is also grounded through the fourth capacitor.

[0013] In an embodiment of the present application, the overvoltage identification module comprises a voltage dividing unit and a judging unit, the voltage dividing unit is connected to the judging unit, and the judging unit is connected to the sampling module and the control module; the voltage dividing unit is configured to receive the power supply voltage, and output the preset voltage after voltage dividing the power supply voltage; the judging unit is configured to receive the detection voltage and the preset voltage, and output an overvoltage signal to the control module when determining that the detection voltage is greater than the preset voltage.

[0014] In an embodiment of the present application, the voltage dividing unit comprises an eighth resistor and a ninth resistor; a first end of the eighth resistor is configured to receive the power supply voltage, and a second end of the eighth resistor is connected to the judging unit and grounded through the ninth resistor.

[0015] In an embodiment of the present application, the judging unit comprises a second operational amplifier and a tenth resistor; a positive input end of the second operational amplifier is configured to receive the detection voltage; a negative input end of the second operational amplifier is configured to be connected to the voltage dividing unit; and an output end of the second operational amplifier is connected to the control module and receives a stable voltage through the tenth resistor.

[0016] The second aspect of the present application provides a robot comprising a heat dissipation fan and the control circuit.

[0017] In an embodiment of the present application, the control module is a control chip of the robot, and the target element comprises the control chip.

[0018] It can be understood that, by means of the control module, the target rotating speed of the heat dissipation fan is determined, and by means of the sampling module, the detection voltage of the unit to be measured in the heat dissipation fan is obtained; a corresponding driving signal is generated according to the target rotating speed, and the driving signal is adjusted according to the detection voltage; and the size of the driving voltage output by the driving module is controlled through the adjusted driving signal, so that the heat dissipation fan can work at a relatively appropriate rotating speed, thereby improving the working efficiency of the heat dissipation fan. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 FIG. 1 is a schematic block diagram of a control circuit of a heat dissipation fan provided by an embodiment of the present application.

[0020] Figure 2 FIG. 2 is a schematic block diagram of a second control circuit of a heat dissipation fan provided by an embodiment of the present application.

[0021] Figure 3 FIG. 3 is a schematic block diagram of a driving module provided by an embodiment of the present application.

[0022] Figure 4 FIG. 4 is a circuit schematic diagram of a driving module provided by an embodiment of the present application.

[0023] Figure 5 is a schematic block diagram of a sampling module provided by an embodiment of the present application.

[0024] Figure 6 is a circuit schematic diagram of a sampling module provided by an embodiment of the present application.

[0025] Figure 7 is a schematic block diagram of an overvoltage identification module provided by an embodiment of the present application.

[0026] Figure 8 is a circuit schematic diagram of an overvoltage identification module provided by an embodiment of the present application.

[0027] Figure 9 is a schematic block diagram of a robot provided by an embodiment of the present application. DETAILED DESCRIPTION

[0028] It should be noted that "at least one" in the embodiments of the present application means one or more, and "multiple" means two or more than two. The "and / or" describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent: A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. The terms "first", "second", "third", "fourth" and the like (if any) in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence.

[0029] In addition, it should be noted that the method disclosed in the embodiments of the present application or the method shown in the flowchart includes one or more steps for implementing the method, and the execution order of the multiple steps can be interchanged with each other without departing from the scope of the claims, and some steps can also be deleted.

[0030] At present, a heat dissipation fan is generally provided in an electronic device with heat dissipation requirements, and the temperature of a target element generating heat in the electronic device is reduced through the heat dissipation fan, so as to ensure that the electronic device can normally operate and avoid the problem of downtime due to heat accumulation in the electronic device. However, the heat dissipation fan structure in the prior art is relatively simple, and its control function only has opening and closing, so that the working efficiency of the heat dissipation fan is low, and faults are prone to occur.

[0031] The present application provides a control circuit of a heat dissipation fan and a robot, which is used to improve the working efficiency of the heat dissipation fan and reduce the probability of faults of the heat dissipation fan.

[0032] Please refer to Figure 1 , Figure 1A schematic block diagram of a control circuit of a cooling fan is provided in the embodiments of the present application. The cooling fan 200 is used for cooling a target element, and the control circuit 100 includes a driving module 110, a sampling module 120, and a control module 130.

[0033] The cooling fan 200 and the control circuit 100 thereof can be applied to various electronic devices with cooling requirements, and the target element can be an electronic element that generates high heat during the operation of the electronic device and is susceptible to high heat. For example, the electronic device can be a robot or a sweeping robot, and the target element can be a main controller or a control chip, etc. The control chip includes a SOC chip (SOC, System on Chip).

[0034] In the embodiments of the present application, the driving module 110 is connected with the cooling fan 200, and is used for receiving a power supply voltage and a driving signal, converting the power supply voltage into a driving voltage according to the driving signal, and outputting the driving voltage to the cooling fan 200. The power supply voltage can come from a power supply network of the electronic device, and the driving signal is provided by the control module 130.

[0035] In some embodiments, the driving signal includes a pulse width modulation signal, and the driving module 110 is composed of a switching tube. By adjusting the frequency and duty cycle of the driving signal, the size of the output driving voltage can be adjusted, so as to adjust the rotating speed of the cooling fan 200.

[0036] The sampling module 120 is connected with a to-be-measured unit in the cooling fan 200, and is used for sampling a detection voltage of the to-be-measured unit and outputting the detection voltage. In some embodiments, the sampling module 120 can also be directly connected to the positive and negative electrodes of the cooling fan 200, or the sampling module 120 can also be directly connected to the positive electrode of the cooling fan 200 and the negative electrode grounding end, so as to obtain the working voltage of the cooling fan 200 as the detection voltage.

[0037] The control module 130 is connected with the driving module 110 and the sampling module 120, and is used for determining a target rotating speed of the cooling fan 200, generating and outputting a driving signal according to the target rotating speed, and receiving a detection voltage and adjusting the driving signal according to the detection voltage.

[0038] The control module 130 can detect the working temperature of the target element, and determine the target rotating speed of the cooling fan 200 according to the working temperature.

[0039] In some embodiments, in the electronic device provided with the cooling fan 200 and the control circuit 100 thereof, the control module 130 can be a main controller or a control chip of the electronic device, i.e., the control module 130 is used for controlling not only the cooling fan 200 but also other elements in the electronic device, so as to make the electronic device work.

[0040] It can be understood that the application determines the target rotating speed of the heat dissipation fan 200 through the control module 130, and obtains the detection voltage of the unit 210 to be detected in the heat dissipation fan 200 through the sampling module 120, generates a corresponding driving signal according to the target rotating speed, adjusts the driving signal according to the detection voltage, and controls the size of the driving voltage output by the driving module 110 through the adjusted driving signal, so that the heat dissipation fan 200 can work at a relatively appropriate rotating speed, thereby improving the working efficiency of the heat dissipation fan 200.

[0041] In some embodiments, as shown in Figure 2 The control circuit 100 further includes an overvoltage identification module 140.

[0042] The overvoltage identification module 140 is connected with the sampling module 120, and is configured to receive the detection voltage and output an overvoltage signal when it is determined that the detection voltage is greater than a preset voltage. The preset voltage can be the maximum working voltage of the heat dissipation fan 200, or can also be a preset multiple of the rated working voltage of the heat dissipation fan 200, for example, the preset voltage is 1.2 times the rated working voltage of the heat dissipation fan 200, and the like, which is not limited herein. The control module 130 is further configured to stop outputting the driving signal when the overvoltage signal is received.

[0043] It can be understood that the application embodiment determines that the detection voltage of the unit to be detected in the heat dissipation fan 200 is greater than the preset voltage, and the control module 130 stops outputting the driving signal through the setting of the overvoltage identification module 140, so as to avoid overvoltage of the heat dissipation fan 200, thereby reducing the probability of failure of the heat dissipation fan 200.

[0044] Please refer to Figure 3 , Figure 3 a schematic block diagram of a driving module 110 provided by the application embodiment. The driving module 110 includes a switching unit 111 and a conversion unit 112.

[0045] In the application embodiment, the switching unit 111 is connected with the conversion unit 112. The switching unit 111 is configured to receive the driving signal and convert the driving signal into a switching signal. The conversion unit 112 is configured to receive the switching signal, convert the power supply voltage into the driving voltage according to the switching signal, and output the driving voltage to the heat dissipation fan 200.

[0046] The switching unit 111 can be composed of a switching element such as a switching tube or a triode, to convert the driving signal into a switching signal of the conversion unit 112. The conversion unit 112 can be composed of a switching tube, and the switching signal is used to control the opening and closing frequency and the duty cycle of the switching tube in the conversion unit 112, so as to convert the power supply voltage into a driving voltage of a target size, to control the rotating speed of the heat dissipation fan 200.

[0047] Please refer toFigure 4 , Figure 4 A circuit schematic diagram of a driving module 110 is provided in the embodiment of the present application. The driving module 110 comprises a switching unit 111 and a conversion unit 112.

[0048] In the embodiment of the present application, the switching unit 111 comprises a first resistor R1, a second resistor R2 and a triode Q1. The base of the triode Q1 receives a driving signal FAN_EN through the first resistor R1, and is grounded through the second resistor R2. The emitter of the triode Q1 is grounded. The collector of the triode Q1 is connected to the conversion unit 112.

[0049] The conversion unit 112 comprises a first capacitor C1, a second capacitor C2, a third capacitor C3, a third resistor R3 and a switching transistor Q2. The source of the switching transistor Q2 receives a supply voltage VDD, and is grounded through the first capacitor C1. The gate of the switching transistor Q2 is connected to the source of the switching transistor Q2 through the third resistor R3. The second capacitor C2 is connected in parallel with the third resistor R3. The drain of the switching transistor Q2 is connected to the heat dissipation fan 200, and is grounded through the third capacitor C3.

[0050] In the embodiment of the present application, the triode Q1 is an NPN triode Q1, and the switching transistor Q2 is a P-type switching transistor Q2. When the driving signal FAN_EN is a pulse width modulation signal, the triode Q1 is turned on when receiving a pulse of the pulse width modulation signal, so as to turn on the switching transistor Q2, and then make the drain end of the switching transistor Q2 output a voltage at the pulse time. Since the second capacitor C2 and the third resistor R3 form an RC circuit, the voltage output at each pulse time is shaped into a direct current voltage, which is the driving signal VCC_FAN.

[0051] Please refer to Figure 5 , Figure 5 A schematic block diagram of a sampling module 120 is provided in the embodiment of the present application. The sampling module 120 comprises an amplification unit 121 and a filtering unit 122.

[0052] In the embodiment of the present application, the amplification unit 121 is connected to a unit to be measured, and the filtering unit 122 is connected to the amplification unit 121. The amplification unit 121 is configured to obtain a detection voltage of the unit to be measured, and amplify the detection voltage by a preset multiple. The filtering unit 122 is configured to perform filtering processing on the detection voltage amplified by the preset multiple, and then transmit the detection voltage to the overvoltage identification module 140 and the control module 130.

[0053] It can be understood that, by setting the amplification unit 121 to amplify the detection voltage by a preset multiple, the signal amplitude of the detection voltage is increased, which is more conducive to the use of the overvoltage identification module 140 and the control module 130.

[0054] Please refer to Figure 6 , Figure 6A circuit schematic diagram of a sampling module 120 is provided in the embodiments of the present application. The sampling module 120 comprises an amplification unit 121 and a filtering unit 122.

[0055] In the embodiments of the present application, the amplification unit 121 comprises a first operational amplifier U1, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6. The positive input end of the first operational amplifier U1 is connected to the first end of the unit under test through the fourth resistor R4. The negative input end of the first operational amplifier U1 is connected to the second end of the unit under test through the fifth resistor R5. The output end of the first operational amplifier U1 is connected to the filtering unit 122. The output end of the first operational amplifier U1 is also connected to the negative input end through the sixth resistor R6. The power supply end of the first operational amplifier U1 is used to receive the supply voltage VDD provided by the power supply network of the electronic device, and the ground end of the first operational amplifier U1 is used for grounding.

[0056] The first end of the unit under test of the heat dissipation fan 200 is connected to the ground end FAN_GND of the heat dissipation fan 200, and the second end of the unit under test is connected to the system ground end GND. The unit under test is a sampling resistor R0.

[0057] The filtering unit 122 comprises a seventh resistor R7 and a fourth capacitor C4. The first end of the seventh resistor R7 is connected to the amplification unit 121, and the second end of the seventh resistor R7 is connected to the overvoltage identification module 140 and the control module 130. The second end of the seventh resistor R7 is also grounded through the fourth capacitor C4. The second end of the seventh resistor R7 outputs a detection voltage FAN_ADC.

[0058] Please refer to Figure 7 , Figure 7 A schematic block diagram of an overvoltage identification module 140 is provided in the embodiments of the present application. The overvoltage identification module 140 comprises a voltage dividing unit 141 and a judgment unit 142.

[0059] In the embodiments of the present application, the voltage dividing unit 141 is connected to the judgment unit 142, and the judgment unit 142 is connected to the sampling module 120 and the control module 130. The voltage dividing unit 141 is used to receive the supply voltage VDD and output a preset voltage after voltage dividing processing of the supply voltage VDD. The supply voltage VDD can be provided by the power supply network of the electronic device.

[0060] The judgment unit 142 is used to receive the detection voltage and the preset voltage, and output an overvoltage signal to the control module 130 when the detection voltage is greater than the preset voltage.

[0061] Please refer to Figure 8 , Figure 8 A circuit schematic diagram of an overvoltage identification module 140 is provided in the embodiments of the present application. The overvoltage identification module 140 comprises a voltage dividing unit 141 and a judgment unit 142.

[0062] In the embodiment of the present application, the voltage dividing unit 141 comprises an eighth resistor R8 and a ninth resistor R9. The first end of the eighth resistor R8 is configured to receive the supply voltage VDD, and the second end of the eighth resistor R8 is connected to the judging unit 142 and grounded through the ninth resistor R9.

[0063] The judging unit 142 comprises a second operational amplifier U2 and a tenth resistor R10. The positive input end of the second operational amplifier U2 is configured to receive the detection voltage FAN_ADC. The negative input end of the second operational amplifier U2 is configured to be connected to the voltage dividing unit 141. The output end of the second operational amplifier U2 is connected to the control module 130 and receives the stable voltage VDD1 through the tenth resistor R10.

[0064] The stable voltage can be provided by the power supply network of the electronic device, which can increase the amplitude of the overvoltage signal, reduce the noise in the transmission process of the overvoltage signal, and avoid the short circuit of the output end of the second operational amplifier U2.

[0065] Please refer to Figure 9 , Figure 9 A schematic block diagram of a robot is provided in the embodiment of the present application. The robot 10 comprises a cooling fan 200 and the control circuit 100 of any of the above embodiments.

[0066] In some embodiments, the control module 130 of the control circuit 100 is a control chip of the robot 10, and the target element acted on by the cooling fan 200 comprises the control chip. That is, the control chip detects the working temperature of itself, determines the target rotating speed of the cooling fan 200 according to the working temperature, generates and outputs the driving signal FAN_EN according to the target rotating speed, receives the detection voltage FAN_ADC, adjusts the driving signal FAN_EN according to the detection voltage FAN_ADC, and stops outputting the driving signal FAN_EN when the overvoltage signal is received. The control chip comprises a SOC chip, and the robot 10 comprises a lawn mower robot.

[0067] It can be understood that the beneficial effects of the robot 10 described above can refer to the beneficial effects of the control circuit 100 of the cooling fan 200 in the above embodiments, which will not be described here.

[0068] The above-described embodiments are merely preferred embodiments of the present application, and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements of the technical solutions of the present application made by those skilled in the art shall fall within the protection scope of the claims of the present application.

Claims

1. A control circuit of a cooling fan for cooling a target element, characterized by, The control circuit comprises: a driving module connected with the heat dissipation fan, configured to receive a power supply voltage and a driving signal, convert the power supply voltage into a driving voltage according to the driving signal, and output the driving voltage to the heat dissipation fan; a sampling module connected with a unit to be measured in the heat dissipation fan, configured to sample a detection voltage of the unit to be measured and output the detection voltage; a control module connected with the driving module and the sampling module, configured to determine a target rotating speed of the heat dissipation fan, generate and output the driving signal according to the target rotating speed, and receive the detection voltage and adjust the driving signal according to the detection voltage; the driving module comprises a switching unit and a converting unit, and the switching unit is connected with the converting unit; the switching unit is configured to receive the driving signal and convert the driving signal into a switching signal; the converting unit is configured to receive the switching signal, convert the power supply voltage into the driving voltage according to the switching signal, and output the driving voltage to the heat dissipation fan.

2. The control circuit of claim 1, wherein, Further comprising an overvoltage identification module connected with the sampling module, configured to receive the detection voltage, and output an overvoltage signal when it is determined that the detection voltage is greater than a preset voltage; the control module is further configured to stop outputting the driving signal when the overvoltage signal is received.

3. The control circuit of claim 1, wherein, the switching unit comprises a first resistor, a second resistor and a triode; a base of the triode receives the driving signal through the first resistor and is grounded through the second resistor; an emitter of the triode is grounded; and a collector of the triode is connected with the converting unit.

4. The control circuit of claim 1, wherein, the converting unit comprises a first capacitor, a second capacitor, a third capacitor, a third resistor and a switching tube; a source of the switching tube receives the power supply voltage and is grounded through the first capacitor; a gate of the switching tube is connected to the source of the switching tube through the third resistor; the second capacitor is connected in parallel with the third resistor; and a drain of the switching tube is connected with the heat dissipation fan and is grounded through the third capacitor.

5. The control circuit of claim 1, wherein, the sampling module comprises an amplifying unit and a filtering unit, the amplifying unit is connected with the unit to be measured, and the filtering unit is connected with the amplifying unit; the amplifying unit is configured to acquire the detection voltage of the unit to be measured and amplify the detection voltage by a preset multiple; the filtering unit is configured to perform filtering processing on the detection voltage amplified by the preset multiple and then transmit the detection voltage to the control module.

6. The control circuit of claim 5, wherein, the amplifying unit comprises a first operational amplifier, a fourth resistor, a fifth resistor and a sixth resistor; a positive input end of the first operational amplifier is connected to a first end of the unit to be measured through the fourth resistor; a negative input end of the first operational amplifier is connected to a second end of the unit to be measured through the fifth resistor; an output end of the first operational amplifier is connected with the filtering unit; and the output end of the first operational amplifier is further connected to the negative input end through the sixth resistor.

7. The control circuit of claim 6, wherein, the first end of the unit to be measured is connected with a grounding end of the heat dissipation fan, the second end of the unit to be measured is connected with a system grounding end, and the unit to be measured is a sampling resistor.

8. The control circuit of claim 5, wherein, The filter unit comprises a seventh resistor and a fourth capacitor; a first end of the seventh resistor is connected to the amplification unit, and a second end of the seventh resistor is connected to the control module; the second end of the seventh resistor is also connected to the ground through the fourth capacitor.

9. The control circuit of claim 2, wherein, The overvoltage identification module comprises a voltage division unit and a judgment unit; the voltage division unit is connected to the judgment unit; the judgment unit is connected to the sampling module and the control module. The voltage division unit is configured to receive the power supply voltage, divide the power supply voltage, and output the preset voltage. The judgment unit is configured to receive the detection voltage and the preset voltage, and output an overvoltage signal to the control module when the detection voltage is greater than the preset voltage.

10. The control circuit of claim 9, wherein, The voltage division unit comprises an eighth resistor and a ninth resistor; a first end of the eighth resistor is configured to receive the power supply voltage; and a second end of the eighth resistor is connected to the judgment unit and connected to the ground through the ninth resistor.

11. The control circuit of claim 9, wherein, The judgment unit comprises a second operational amplifier and a tenth resistor; a positive input end of the second operational amplifier is configured to receive the detection voltage; a negative input end of the second operational amplifier is configured to be connected to the voltage division unit; and an output end of the second operational amplifier is connected to the control module and receives a stable voltage through the tenth resistor.

12. A robot, characterized in that The control circuit comprises a heat dissipation fan and the control circuit according to any one of claims 1 to 11.

13. The robot of claim 12, wherein, The control module is a control chip of the robot, and the target element comprises the control chip.

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