Control circuit and photovoltaic tracking system

Abstract

The utility model relates to a control circuit and a photovoltaic tracking system, the control circuit comprises a driving module and a protection circuit, the driving module is used for being connected with a motor to drive the motor to rotate, and the protection module is connected with the driving module and used for outputting a cut-off signal to the driving module when the working current of the driving module exceeds a preset value. And the driving module is controlled to stop driving work. The control circuit is composed of hardware structures, the structure is simple, when the working current of the motor exceeds the preset threshold value, the driving module can be controlled to stop driving work within the us (microsecond)-level time, the motor protection cost is reduced, and meanwhile protection on the motor can be efficiently achieved in time.

Description

Technical Field

[0001] This application relates to the field of photovoltaic tracking control technology, and in particular to control circuits and photovoltaic tracking systems. Background Technology

[0002] Currently, photovoltaic tracking brackets have evolved into various types. To address different needs, designers have developed different control methods. To ensure the safe and reliable operation of the electric drive system and bracket, an electric drive protection scheme is proposed, which collects the motor drive current and immediately protects the system when the current exceeds the set rated current. During system operation, the controller measures the real-time operating current of the motor and compares it with the set current value. When the set current value is exceeded, the controller triggers overcurrent protection, stopping the motor. However, existing technical solutions are relatively complex, mostly relying on software protection with protection speeds in the millisecond range, which cannot provide timely and effective motor protection. Utility Model Content

[0003] Therefore, it is necessary to provide a control circuit and a photovoltaic tracking system to address the aforementioned technical problems.

[0004] In a first aspect, this application provides a control circuit, the control circuit comprising:

[0005] A drive module is used to connect to a motor to drive the motor to rotate;

[0006] A protection module, connected to the drive module, is used to output a cutoff signal to the drive module when the operating current of the drive module exceeds a preset threshold, so as to control the drive module to stop driving.

[0007] In one embodiment, the protection module includes:

[0008] A sampling unit is used to connect to the motor, collect the operating current of the motor, and convert the operating current into an operating voltage;

[0009] A comparison unit, connected to the sampling unit, is used to output a cutoff signal when the operating voltage is greater than the reference voltage; the reference voltage corresponds to the preset threshold.

[0010] The control unit, connected to the comparison unit and the drive module, is used to transmit the cutoff signal to the drive module when the cutoff signal is received, so as to control the drive module to stop driving.

[0011] In one embodiment, the sampling unit includes a sampling resistor, the two ends of which are connected to the motor and the comparison unit, respectively.

[0012] In one embodiment, the sampling unit further includes:

[0013] A capacitor element is connected in parallel with the sampling resistor;

[0014] A first operational amplifier, wherein the non-inverting input terminal and the inverting input terminal of the first operational amplifier are respectively connected to the two ends of the capacitor element, the inverting input terminal of the first operational amplifier is also connected to the equivalent ground terminal, and the output terminal of the first operational amplifier is connected to the comparator unit. The first operational amplifier is used to amplify the working voltage and output it.

[0015] The first resistor is connected to both the inverting input and output terminals of the first operational amplifier.

[0016] In one embodiment, the comparison unit includes:

[0017] A second operational amplifier has a non-inverting input terminal connected to a reference voltage, an inverting input terminal connected to the sampling unit, and an output terminal connected to the control unit; the reference voltage corresponds to the preset threshold.

[0018] The second resistor is connected to the positive power supply terminal and the output terminal of the second operational amplifier, respectively.

[0019] When the operating voltage connected to the inverting input terminal of the second operational amplifier is greater than the reference voltage, the output terminal of the second operational amplifier outputs the cutoff signal.

[0020] In one embodiment, the control unit includes:

[0021] A third resistor, the first end of which is connected to the comparison unit;

[0022] A diode assembly, wherein the cathode of the diode assembly is connected to the second end of the third resistor, and the anode of the diode assembly is connected to the driving module. The diode assembly is used to conduct the connection between the comparison unit and the driving module when the third resistor receives the cutoff signal, so that the cutoff signal is transmitted to the driving module, and the driving module stops driving under the action of the cutoff signal.

[0023] In one embodiment, the diode assembly includes:

[0024] The first diode has its cathode connected to the second terminal of the third resistor, and its anode connected to the driving module.

[0025] The second diode has its cathode connected to the second terminal of the third resistor and its anode connected to the drive module.

[0026] When the first diode and the second diode receive a cutoff signal from the third resistor, both the first diode and the second diode turn on the connection between the comparator unit and the drive module, so that the cutoff signal is transmitted to the drive module, and the drive module stops driving under the action of the cutoff signal.

[0027] In one embodiment, the comparison unit is further configured to output a sustaining signal when the operating voltage is less than the reference voltage;

[0028] The control unit is also used to control the drive module to perform normal drive operation when the sustain signal is received.

[0029] In one embodiment, it further includes:

[0030] The main control module, connected to the drive module and the protection module, is used to send drive commands to the drive module to control the drive module to drive the motor to rotate to the target angle, and to stop sending the drive commands when it receives the cut-off signal output by the protection module.

[0031] Secondly, this application provides a photovoltaic tracking system, comprising:

[0032] A photovoltaic module tracking bracket, on which photovoltaic modules are installed;

[0033] An electric motor is used to drive the photovoltaic module tracking bracket to rotate the photovoltaic module and change its orientation.

[0034] The aforementioned control circuit is connected to the motor.

[0035] The aforementioned control circuit and photovoltaic tracking system include a drive module and a protection circuit. The drive module connects to the motor to drive its rotation, and the protection module connects to the drive module and outputs a cutoff signal to the drive module when its operating current exceeds a preset value, thereby controlling the drive module to stop operating. The control circuits in this application are all composed of hardware structures and are simple in design. When the motor's operating current exceeds the preset threshold, it can control the drive module to stop operating within a microsecond (µs) time, reducing motor protection costs and providing timely and efficient motor protection. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is one of the schematic diagrams of the control circuit in one embodiment of this application;

[0038] Figure 2 This is a schematic diagram of the protection circuit in one embodiment of this application;

[0039] Figure 3 This is a schematic diagram of the sampling unit in one embodiment of this application;

[0040] Figure 4 This is a schematic diagram of the structure of the comparison unit in one embodiment of this application;

[0041] Figure 5 This is a schematic diagram of the structure of the control unit in one embodiment of this application;

[0042] Figure 6 This is a schematic diagram of the structure of a diode assembly in one embodiment of this application;

[0043] Figure 7 This is a second schematic diagram of the control circuit in one embodiment of this application.

[0044] Explanation of icon numbers:

[0045] Control circuit: 100; Drive module: 110; Protection module: 120; Sampling unit: 121; Comparison unit: 122; Control unit: 123; Diode assembly: 1231; Main control module: 130; Motor: 210. Detailed Implementation

[0046] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0047] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0050] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0051] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0052] In one embodiment, see Appendix Figure 1 , attached Figure 1 The diagram shows one of the structural schematic diagrams of a control circuit 100 in one embodiment of this application. The control circuit 100 in this embodiment includes a drive module 110 and a protection module 120. The drive module 110 is used to connect to the motor 210 to drive the motor 210 to rotate. The protection module 120 is connected to the drive module 110 and is used to output a cutoff signal to the drive module 110 when the operating current of the drive module 110 exceeds a preset threshold, so as to control the drive module 110 to stop driving.

[0053] The protection module 120 can be a combined circuit with current acquisition, signal generation, and transmission functions. The motor 210 operates under the drive of the drive module 110. When the motor 210 is running normally, the protection module 120 acquires the operating current of the drive module 110 in real time. When the operating current exceeds a preset threshold in the protection circuit, the protection circuit can control the drive module 110 by outputting a control signal, causing the drive module 110 to stop driving, thereby stopping the motor 210. In this embodiment, the control circuit 100 is composed entirely of hardware and has a simple structure. When the operating current of the motor 210 exceeds the preset threshold, it can control the drive module 110 to stop driving within a microsecond time, reducing the protection cost of the motor 210 and providing timely and efficient protection for the motor 210.

[0054] In one embodiment, see Appendix Figure 2 , attached Figure 2 A schematic diagram of the protection module 120 in this embodiment is shown. The protection module 120 in this embodiment includes a sampling unit 121, a comparison unit 122, and a control unit 123. The sampling unit 121 is connected to the motor 210 and is used to collect the operating current of the motor 210 and convert the operating current into an operating voltage. The comparison unit 122 is connected to the sampling unit 121 and is used to output a cutoff signal when the operating voltage is greater than a reference voltage, the reference voltage corresponding to a preset threshold. The control unit 123 is connected to the comparison unit 122 and the drive module 110 and is used to transmit the cutoff signal to the drive module 110 when the cutoff signal is received, so as to control the drive module 110 to stop driving.

[0055] In this embodiment, the sampling unit 121 collects the operating current of the motor 210, specifically converting the operating current into an operating voltage, which is then compared with a preset voltage threshold in the comparison unit 122. When the operating voltage is greater than the preset threshold, it indicates that the operating current of the motor 210 is too high, which may indicate that the drive module 110 is damaged, the motor 210 is stalled, the motor 210 is rotating too much, or the weather is bad. At this time, the comparison unit 122 outputs a cutoff signal of the target level state according to the comparison result, such as a low-level cutoff signal. When the control unit 123 receives the cutoff signal, it transmits the cutoff signal to the drive module 110, thereby causing the drive module 110 to stop driving under the action of the cutoff signal, thus controlling the motor 210 to stop running and protecting the circuit safety.

[0056] It is understood that, depending on the different working mechanisms of the control unit 123, the cutoff signal can also be in a high-level state. Those skilled in the art can flexibly set it according to the actual situation, and are not limited to this.

[0057] In one embodiment, the sampling unit 121 includes a sampling resistor R0, with its two ends connected to the motor 210 and the comparison unit 122, respectively.

[0058] Specifically, by using the required protection current value and Ohm's law, the voltage drop across R0 can be calculated: U = I * R0. Therefore, in this embodiment, the operating current of the motor 210 can be converted into operating voltage through the sampling resistor R0, simplifying the circuit structure and reducing operating costs.

[0059] In one embodiment, see Appendix Figure 3 , attached Figure 3 A schematic diagram of the sampling unit 121 in this embodiment is shown. Based on the previous embodiment, the sampling unit 121 in this embodiment further includes a capacitor C1, a first operational amplifier U1, and a first resistor R1. The capacitor C1 is connected in parallel with the sampling resistor R0. The non-inverting input 3 and the inverting input 4 of the first operational amplifier U1 are respectively connected to the two ends of the capacitor C1. The inverting input 4 of the first operational amplifier U1 is also connected to the equivalent ground GND. The output 1 of the first operational amplifier U1 is connected to the comparator unit 122. The first operational amplifier U1 is used to amplify the working voltage and output I_OUT. The first resistor R1 is connected to the inverting input 4 and the output 1 of the first operational amplifier U1.

[0060] The capacitor element is connected in parallel with the sampling resistor R0, which can filter the working voltage collected by the sampling resistor R0 to remove high-frequency noise. Further connection to the first operational amplifier U1 can amplify the collected working voltage, avoiding common-mode and differential-mode interference and reducing noise. Therefore, the sampling unit 121 in this embodiment includes a sampling resistor R0, a capacitor element C1, and a first operational amplifier U1. The non-inverting input terminal 3 and the inverting input terminal 4 of the first operational amplifier U1 are respectively connected to the two ends of the capacitor element C1. The inverting input terminal 4 of the first operational amplifier U1 is also connected to the equivalent ground terminal GND. The output terminal 1 of the first operational amplifier U1 is connected to the comparison unit 122. The first resistor R1 is connected to the inverting input terminal 4 and the output terminal 1 of the first operational amplifier U1, which can improve the accuracy of the acquisition of the motor 210 working current.

[0061] In one embodiment, see Appendix Figure 4 , attached Figure 4 This diagram illustrates the structure of the comparison unit 122 in this embodiment. The comparison unit 122 includes a second operational amplifier U2 and a second resistor R2. The non-inverting input 4 of the second operational amplifier U2 is connected to a reference voltage, the inverting input 3 of the second operational amplifier U2 is connected to the sampling unit 121, and the output 1 of the second operational amplifier U2 is connected to the control unit 123. The reference voltage Vref corresponds to a preset threshold. The second resistor R2 is connected to the positive power supply 5 and the output 1 of the second operational amplifier U2, respectively. When the operating voltage I_OUT connected to the inverting input 3 of the second operational amplifier U2 is greater than the reference voltage Vref, the output 1 of the second operational amplifier U2 outputs a cutoff signal. .

[0062] In this embodiment, the second operational amplifier U2 is used as a comparator. At this time, the second operational amplifier U2 is in an open-loop state. When the operating voltage I_OUT connected to the inverting input terminal 3 of the second operational amplifier U2 is greater than the reference voltage Vref connected to the non-inverting input terminal 4 of the second operational amplifier U2, the output terminal 1 of the second operational amplifier U2 outputs a low-level signal close to the negative power supply voltage, which is the cutoff signal in this embodiment. This allows the control unit 123 to further control the drive module 110 to stop driving. Furthermore, in this embodiment, a second resistor R2 is provided between the positive power supply terminal 5 and the output terminal 1 of the second operational amplifier U2. This prevents a short circuit at the output terminal 1 of the second operational amplifier U2, protecting the device from damage and improving the circuit's lifespan.

[0063] In one embodiment, see Appendix Figure 5 , attached Figure 5A schematic diagram of the control unit 123 in this embodiment is shown. The control unit 123 includes a third resistor R3 and a diode assembly 1231. The first end of the third resistor R3 is connected to the comparison unit 122; the cathode of the diode assembly 1231 is connected to the second end of the third resistor R3, and the anode of the diode assembly 1231 is connected to the drive module 110. The diode assembly 1231 is used to detect when the third resistor R3 receives a cutoff signal. At this time, the connection between the comparator unit 122 and the drive module 110 is turned on, so that the cutoff signal is turned off. It is transmitted to the drive module 110 so that the drive module 110 stops driving under the action of the cutoff signal.

[0064] The number of diode assemblies 1231 can be flexibly set according to the operating conditions of the drive module 110. For example, the drive module 110 has only one control terminal, at which a cutoff signal is received. When the drive module 110 stops working, the diode assembly 1231 may consist of only one diode element. If the drive module 110 has two control terminals, and the drive module 110 only stops working when both control terminals receive a cutoff signal, then the diode assembly 1231 may include two diode elements, but is not limited to this. In this embodiment, the control unit 123 includes a low-cost resistor and the diode assembly 1231. By transmitting a cutoff signal to the drive module 110 when the diode is conducting, the control of the drive module 110's operation is achieved, which improves the circuit response speed while reducing circuit cost.

[0065] In one embodiment, see Appendix Figure 6 , attached Figure 6 This diagram illustrates the structure of the diode assembly 1231 in this embodiment. The diode assembly 1231 includes a first diode D1 and a second diode D2. The cathode of the first diode D1 is connected to the second terminal of the third resistor R3, and the anode of the first diode D1 is connected to the driving module 110. The cathode of the second diode D2 is connected to the second terminal of the third resistor R3, and the anode of the second diode D2 is connected to the driving module 110. When the first diode D1 and the second diode D2 receive a cutoff signal at the third resistor R3... At this time, both the first diode D1 and the second diode D2 turn on the connection between the comparator unit 122 and the drive module 110, so that the cutoff signal is turned off. The signal is transmitted to the drive module 110 so that the drive module 110 can receive the cutoff signal. The drive stops working under its influence.

[0066] The number of first diodes D1 and second diodes D2 can be flexibly designed according to the operating conditions of the drive module 110. For example, if the drive module 110 is an H-bridge drive circuit, it requires four control signals to drive the motor 210. In this case, the number of first diodes D1 and second diodes D2 can both be two. This embodiment shows the case where the number of first diodes D1 and second diodes D2 are both two. The anode of one diode in the first diode D1 is connected to the second high-side drive terminal H2 of the drive module 110, and the anode of the other diode in the first diode D1 is connected to the second low-side drive terminal L2 of the drive module 110. The anode of one diode in the second diode D2 is connected to the first high-side drive terminal H1 of the drive module 110, and the anode of the other diode in the second diode D2 is connected to the first low-side drive terminal L1 of the drive module 110. When the first high-side drive terminal H1, the first low-side drive terminal L1, the second high-side drive terminal H2, and the second low-side drive terminal L2 all receive low-level signals, the drive module 110 stops driving, and the motor 210 stops running.

[0067] In one embodiment, the comparison unit 122 is further configured to output a sustaining signal when the operating voltage is less than the reference voltage; the control unit 123 is further configured to control the drive module 110 to perform normal drive operation when the sustaining signal is received.

[0068] In this embodiment, the sustain signal can be an electrical signal with the opposite level to the cutoff signal. For example, when the cutoff signal is a low-level signal, the sustain signal can be a high-level signal. At this time, the diode assembly 1231 in the control unit 123 is in the off state and will not transmit a low-level cutoff signal to the drive module 110. As a result, the drive module 110 can perform normal drive work and the motor 210 can operate normally.

[0069] In one embodiment, see Appendix Figure 7 , attached Figure 7 The diagram shows a second structural schematic of a control circuit 100. In this embodiment, the control circuit 100, based on any of the above embodiments, further includes a main control module. The main control module is connected to the drive module 110 and the protection module 120. It is used to send drive commands to the drive module 110 to control the drive module 110 to drive the motor 210 to rotate to the target angle, and to stop sending drive commands when it receives the cut-off signal output by the protection module 120.

[0070] For example, the main control module includes a sensing unit and a main control unit. The sensing unit is used to collect the rotation angle of the motor 210 in real time. The main control unit is connected to the drive module 110, the sensing unit and the protection module 120 respectively, and is used to send drive commands and stop sending drive commands when a cutoff signal is received.

[0071] In this embodiment, the control circuit controls the normal driving operation of the drive module through the main control module. When the motor's operating current collected by the protection module exceeds the preset threshold, the comparison unit in the protection module outputs a cutoff signal. At this time, the main control unit stops sending drive commands to the drive module based on the cutoff signal, thereby ensuring that the drive module will not perform drive operation again. That is, the control circuit in this embodiment can realize software protection and hardware protection at the same time, which improves the reliability of circuit control.

[0072] In one embodiment, this application also provides a photovoltaic tracking system. The photovoltaic tracking system in this embodiment includes a photovoltaic module tracking bracket, a motor, and a control circuit in any of the above embodiments. The photovoltaic module tracking bracket is provided with a photovoltaic module; the motor is used to drive the photovoltaic module tracking bracket to rotate the photovoltaic module to change the orientation of the photovoltaic module; the control circuit is connected to the motor.

[0073] It is understood that the photovoltaic tracking system in this embodiment includes the control circuit in any of the above embodiments. When the control circuit in the above embodiments is more timely, inexpensive and reliable than the prior art, the photovoltaic tracking system in this embodiment also has the above effects.

[0074] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the scope of protection of this patent application should be determined by the appended claims.

Claims

1. A control circuit, characterized in that, The control circuit includes: A drive module is used to connect to a motor to drive the motor to rotate; A protection module, connected to the drive module, is used to output a cutoff signal to the drive module when the operating current of the drive module exceeds a preset threshold, so as to control the drive module to stop driving.

2. The control circuit according to claim 1, characterized in that, The protection module includes: A sampling unit is used to connect to the motor, collect the operating current of the motor, and convert the operating current into an operating voltage; A comparison unit, connected to the sampling unit, is used to output a cutoff signal when the operating voltage is greater than the reference voltage; the reference voltage corresponds to the preset threshold. The control unit, connected to the comparison unit and the drive module, is used to transmit the cutoff signal to the drive module when the cutoff signal is received, so as to control the drive module to stop driving.

3. The control circuit according to claim 2, characterized in that, The sampling unit includes a sampling resistor, and the two ends of the sampling resistor are respectively connected to the motor and the comparison unit.

4. The control circuit according to claim 3, characterized in that, The sampling unit further includes: A capacitor element is connected in parallel with the sampling resistor; A first operational amplifier, wherein the non-inverting input terminal and the inverting input terminal of the first operational amplifier are respectively connected to the two ends of the capacitor element, the inverting input terminal of the first operational amplifier is also connected to the equivalent ground terminal, and the output terminal of the first operational amplifier is connected to the comparator unit. The first operational amplifier is used to amplify the working voltage and output it. The first resistor is connected to both the inverting input and output terminals of the first operational amplifier.

5. The control circuit according to claim 2, characterized in that, The comparison unit includes: The second operational amplifier has a non-inverting input terminal connected to a reference voltage, an inverting input terminal connected to the sampling unit, and an output terminal connected to the control unit. The second resistor is connected to the positive power supply terminal and the output terminal of the second operational amplifier, respectively. When the operating voltage connected to the inverting input terminal of the second operational amplifier is greater than the reference voltage, the output terminal of the second operational amplifier outputs the cutoff signal.

6. The control circuit according to claim 2, characterized in that, The control unit includes: A third resistor, the first end of which is connected to the comparison unit; A diode assembly, wherein the cathode of the diode assembly is connected to the second end of the third resistor, and the anode of the diode assembly is connected to the driving module. The diode assembly is used to conduct the connection between the comparison unit and the driving module when the third resistor receives the cutoff signal, so that the cutoff signal is transmitted to the driving module, and the driving module stops driving under the action of the cutoff signal.

7. The control circuit according to claim 6, characterized in that, The diode assembly includes: The first diode has its cathode connected to the second terminal of the third resistor, and its anode connected to the driving module. The second diode has its cathode connected to the second terminal of the third resistor and its anode connected to the drive module. When the first diode and the second diode receive a cutoff signal from the third resistor, both the first diode and the second diode turn on the connection between the comparator unit and the drive module, so that the cutoff signal is transmitted to the drive module, and the drive module stops driving under the action of the cutoff signal.

8. The control circuit according to claim 2, characterized in that, The comparison unit is also configured to output a sustaining signal when the operating voltage is less than the reference voltage; The control unit is also used to control the drive module to perform normal drive operation when the sustain signal is received.

9. The control circuit according to any one of claims 1 to 8, characterized in that, Also includes: The main control module, connected to the drive module and the protection module, is used to send drive commands to the drive module to control the drive module to drive the motor to rotate to the target angle, and to stop sending the drive commands when it receives the cut-off signal output by the protection module.

10. A photovoltaic tracking system, characterized in that, include: A photovoltaic module tracking bracket, on which photovoltaic modules are installed; An electric motor is used to drive the photovoltaic module tracking bracket to rotate the photovoltaic module and change its orientation. The control circuit according to any one of claims 1 to 9 is connected to the motor.

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