Reverse connection control circuit and heating device

Abstract

The application discloses a reverse connection control circuit and a heating device. The reverse connection control circuit comprises a power supply module, a polarity detection module, and a first switch group. The power supply module is provided with a first power supply port and a second power supply port and is used for providing a power supply. The polarity detection module is used for detecting a first polarity of the first power supply port and a second polarity of the second power supply port. The first switch group is connected with the polarity detection module and a subsequent circuit. The first switch group comprises a first sub-switch and a second sub-switch. The first sub-switch is provided with a first common terminal and a first free terminal group. The second sub-switch is provided with a second common terminal and a second free terminal group. The polarity detection module is further used for controlling connection states of the first common terminal and the first free terminal group and the second common terminal and the second free terminal group according to the first polarity and the second polarity. The application can normally work when the power supply module is connected in normal or reverse, thereby improving stability of the subsequent circuit and / or the heating module.

Description

Technical Field

[0001] This invention relates to the field of reverse connection control, and more particularly to a reverse connection control circuit and heating device. Background Technology

[0002] Currently, by incorporating reverse connection protection circuits into electronic products, damage to the product circuitry can be prevented when the positive and negative terminals of the power supply are reversed.

[0003] In related technologies, reverse connection protection circuits utilize the unidirectional conductivity of diodes to protect the circuit from reverse connection. However, when the power supply is reversed, the subsequent circuits cannot function properly, affecting their operational stability. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a reverse connection control circuit and heating device that can operate normally whether the power supply module is connected in the correct or reverse direction, thereby improving the working stability of the subsequent circuits and / or the heating module.

[0005] According to a first aspect of the present invention, a reverse connection control circuit includes: a power supply module having a first power supply port and a second power supply port for providing power; a polarity detection module connected to the first power supply port and the second power supply port respectively for detecting a first polarity of the first power supply port and a second polarity of the second power supply port respectively; and a first switch group connected to the polarity detection module and a subsequent circuit respectively; wherein the first switch group includes a first sub-switch and a second sub-switch, the first sub-switch having a first common terminal and a first free terminal group, the first free terminal group including a first free terminal, a second free terminal, and a third free terminal, the first common terminal being connected to the first power supply port; the second sub-switch having a second common terminal and a second free terminal group, the second free terminal group including a fourth free terminal, a fifth free terminal, and a sixth free terminal, the fourth free terminal being connected to the third free terminal, the sixth free terminal being connected to the first free terminal, and the second common terminal being connected to the second power supply port; the polarity detection module is further used to control the connection state between the first common terminal and the first free terminal group, and the connection state between the second common terminal and the second free terminal according to the first polarity and the second polarity.

[0006] The reverse connection control circuit according to an embodiment of the present invention has at least the following beneficial effects: by detecting the first polarity of the first power supply port and the second polarity of the second power supply port through the polarity detection module, the connection state of the first sub-switch and the second sub-switch is controlled according to the first polarity and the second polarity, so that the subsequent circuit can work normally when the power supply module is connected in both positive and negative directions, thereby improving the working stability of the subsequent circuit.

[0007] According to some embodiments of the present invention, the polarity detection module includes: a comparator having a first input terminal, a second input terminal, and an output terminal, the first input terminal being connected to a first power supply port, and the second input terminal being connected to a second power supply port, for detecting the first polarity and the second polarity, and generating a first control signal based on the first polarity and the second polarity; and a first control unit having one end connected to the output terminal, and the other end connected to a first sub-switch and a second sub-switch respectively, for controlling the connection state of the first common terminal and the first free terminal group, and the connection state of the second common terminal and the second free terminal group according to the first control signal.

[0008] According to some embodiments of the present invention, it further includes: a protection module; the protection module includes: a second switch group, one end of the second switch group being connected to the first power supply port, and the other end of the second switch group being connected to the first sub-switch; a second control unit, one end of the second control unit being connected to the second switch group, and the other end of the second control unit being connected to the first sub-switch and the second sub-switch respectively, for receiving a second control signal and controlling the connection state of the second switch group according to the second control signal.

[0009] According to some embodiments of the present invention, the second switch group includes: a third sub-switch, which is connected to the first power supply port, the second control unit, and the first common terminal respectively; a fourth sub-switch, which is connected to the first power supply port and the second control unit respectively, and is connected in parallel with the third sub-switch; and a resistor, one end of which is connected to the fourth sub-switch, and the other end of which is connected to the third sub-switch and the first common terminal respectively; wherein, the second control unit is used to control the connection state of the third sub-switch and the fourth sub-switch according to the second control signal.

[0010] A heating device according to a second aspect of the present invention includes: a power supply module having a first power supply port and a second power supply port for providing power; a polarity detection module connected to the first power supply port and the second power supply port respectively for detecting a first polarity of the first power supply port and a second polarity of the second power supply port respectively; a first switch group connected to the polarity detection module; and a heating module connected to the first switch group; wherein the first switch group includes a first sub-switch and a second sub-switch, the first sub-switch having a first common terminal and a first free terminal group, the first free terminal group including a first free terminal, a second free terminal, and a third free terminal, the first common terminal being connected to the first power supply port; the second sub-switch having a second common terminal and a second free terminal group, the second free terminal group including a fourth free terminal, a fifth free terminal, and a sixth free terminal, the fourth free terminal being connected to the third free terminal, the sixth free terminal being connected to the first free terminal, and the second common terminal being connected to the second power supply port; the polarity detection module is further used to control the connection state between the first common terminal and the first free terminal group, and the connection state between the second common terminal and the second free terminal according to the first polarity and the second polarity.

[0011] According to some embodiments of the present invention, the polarity detection module includes: a comparator having a first input terminal, a second input terminal, and an output terminal, the first input terminal being connected to a first power supply port, and the second input terminal being connected to a second power supply port, for detecting the first polarity and the second polarity, and generating a first control signal based on the first polarity and the second polarity; and a first control unit having one end connected to the output terminal, and the other end connected to a first sub-switch and a second sub-switch respectively, for controlling the connection state of the first common terminal and the first free terminal group, and the connection state of the second common terminal and the second free terminal group according to the first control signal.

[0012] According to some embodiments of the present invention, it further includes: a protection module; the protection module includes: a second switch group, one end of the second switch group being connected to the first power supply port, and the other end of the second switch group being connected to the first sub-switch; a second control unit, one end of the second control unit being connected to the second switch group, and the other end of the second control unit being connected to the first sub-switch and the second sub-switch respectively, for receiving a second control signal and controlling the connection state of the second switch group according to the second control signal.

[0013] According to some embodiments of the present invention, the second switch group includes: a third sub-switch, which is connected to the first power supply port, the second control unit, and the first common terminal respectively; a fourth sub-switch, which is connected to the first power supply port and the second control unit respectively, and is connected in parallel with the third sub-switch; and a resistor, one end of which is connected to the fourth sub-switch, and the other end of which is connected to the third sub-switch and the first common terminal respectively; wherein, the second control unit is used to control the connection state of the third sub-switch and the fourth sub-switch according to the second control signal.

[0014] According to some embodiments of the present invention, the heating module includes: a plurality of heating units connected in parallel; wherein each heating unit includes: a transistor and a heating element, the collector of the transistor is connected to the first free end and the sixth free end respectively, the emitter of the transistor is connected to one end of the heating element, and the other end of the heating element is connected to the third free end and the fourth free end respectively.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0017] Figure 1 This is a schematic diagram of a specific embodiment of the reverse connection control circuit of the present invention;

[0018] Figure 2 This is a schematic diagram of another specific embodiment of the reverse connection control circuit of the present invention;

[0019] Figure 3 This is a schematic diagram of another specific embodiment of the reverse connection control circuit of the present invention;

[0020] Figure 4 This is a schematic diagram of a specific embodiment of the polarity detection module of the present invention;

[0021] Figure 5 This is a schematic diagram of a specific embodiment of the heating device of the present invention;

[0022] Figure 6 This is a schematic diagram of another specific embodiment of the heating device of the present invention;

[0023] Figure 7 This is a schematic diagram of another specific embodiment of the heating device of the present invention.

[0024] Figure label:

[0025] The system includes a power supply module 100, a polarity detection module 200, a comparator 210, a first control unit 220, a first switch group 300, a second switch group 410, a second control unit 420, a subsequent circuit 500, and a heating unit 610. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0027] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limiting this invention.

[0028] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0029] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0030] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] Reference Figure 1This application provides a reverse connection control circuit. In some embodiments, the reverse connection control circuit includes: a power supply module 100, a polarity detection module 200, and a first switch group 300. The power supply module 100 has a first power supply port A and a second power supply port B, and is used to provide power. The polarity detection module 200 is connected to the first power supply port A and the second power supply port B respectively, and is used to detect the first polarity of the first power supply port A and the second polarity of the second power supply port B respectively. The first switch group 300 is connected to the polarity detection module 200 and the subsequent circuit 500 respectively. The first switch group 300 includes: a first sub-switch S1 and a second sub-switch S2. The first sub-switch S1 has a first common terminal and a first free terminal group. The first free terminal group includes: a first free terminal, a second free terminal, and a third free terminal. The first common terminal is used to connect to the first power supply port A. The second sub-switch S2 has a second common terminal and a second free terminal group. The second free terminal group includes: a fourth free terminal, a fifth free terminal, and a sixth free terminal. The fourth free end is connected to the third free end, the sixth free end is connected to the first free end, and the second common end is connected to the second power supply port B. The polarity detection module 200 is also used to control the connection status of the first common end and the first free end group, and the connection status of the second common end and the second free end group according to the first polarity and the second polarity.

[0032] Specifically, both the first sub-switch S1 and the second sub-switch S2 are three-position switchable switches. In the initial state, the first common terminal is connected to the second free terminal, and the second common terminal is connected to the fifth free terminal. At this time, both the first sub-switch S1 and the second sub-switch S2 are in a floating state, and the subsequent circuit 500 has no power supply. When the power supply is turned on, the first common terminal is connected to the first power supply port A. The polarity detection module 200 detects the polarity of the first power supply port A and the second power supply port B, and controls the connection state of the first common terminal to the first free terminal group and the connection state of the second common terminal to the second free terminal group based on the first polarity of the first power supply port A and the second polarity of the second power supply port B. For example: Refer to... Figure 2 When the polarity detection module 200 detects that the first polarity of the first power supply port A is positive and the second polarity of the second power supply port B is negative, it indicates that the power supply module 100 is in a positive connection state. The polarity detection module 200 controls the first common terminal to connect with the first free terminal and the second common terminal to the fourth free terminal, so that the first power supply port A is connected to the positive terminal of the subsequent circuit 500 and the second power supply port B is connected to the negative terminal of the subsequent circuit 500, which meets the power supply polarity requirements of the subsequent circuit 500. (Refer to...) Figure 3When the polarity detection module 200 detects that the first polarity of the first power supply port A is negative and the second polarity of the second power supply port B is positive, it indicates that the power supply module 100 is in a reverse connection state. The polarity detection module 200 controls the first common terminal to connect with the third free terminal and the second common terminal to connect with the sixth free terminal, so that the first power supply port A is connected to the negative terminal of the subsequent circuit 500 and the second power supply port B is connected to the positive terminal of the subsequent circuit 500, which meets the power supply polarity requirements of the subsequent circuit 500. It is understood that the subsequent circuit 500 may include circuits that require power supply polarity, such as motor drive circuits, LED drive circuits, and temperature heating circuits. This application embodiment does not impose specific limitations.

[0033] The reverse connection control circuit provided in this application embodiment detects the first polarity of the first power supply port A and the second polarity of the second power supply port B through the polarity detection module 200. Based on the first polarity and the second polarity, it controls the connection state of the first sub-switch S1 and the second sub-switch S2, so that the subsequent circuit 500 can work normally when the power supply module is connected in both positive and negative directions, thereby improving the working stability of the subsequent circuit 500.

[0034] Reference Figure 2 , Figure 4 In some embodiments, the polarity detection module 200 includes a comparator 210 and a first control unit 220. The comparator 210 has a first input terminal, a second input terminal, and an output terminal. The first input terminal is connected to a first power supply port A, and the second input terminal is connected to a second power supply port B. The comparator 210 is used to detect the first polarity of the first power supply port A and the second polarity of the second power supply port B, and generates a first control signal based on the first and second polarities. One end of the first control unit 220 is connected to the output terminal of the comparator 210, and the other end of the first control unit 220 is connected to a first sub-switch S1 and a second sub-switch S2, respectively, and is used to control the connection state of the first common terminal and the first free terminal group, and the connection state of the second common terminal and the second free terminal group, according to the first control signal.

[0035] Specifically, the first input terminal of comparator 210 is a non-inverting input terminal, the second input terminal of comparator 210 is an inverting input terminal, and the first control unit 220 is a logic control unit. In the initial state, the input signal at the first input terminal is equal to the input signal at the second input terminal, meaning the power supply module 100 has no power output. At this time, the first control unit 220 controls the first common terminal to connect with the second free terminal and the second common terminal to the fifth free terminal, so that both the first sub-switch S1 and the second sub-switch S2 are in a floating open state. When the first power supply port A is positive and the second power supply port B is negative, the input signal at the first input terminal is greater than the input signal at the second input terminal. At this time, the output terminal of comparator 210 outputs a high-level signal. The first control unit 220 controls the first common terminal to connect with the first free terminal and the second common terminal to the fourth free terminal based on the high-level signal, so that the first power supply port A is connected to the positive terminal of the subsequent circuit 500 and the second power supply port B is connected to the negative terminal of the subsequent circuit 500, meeting the power supply polarity requirements of the subsequent circuit 500. When the first power supply port A is negative and the second power supply port B is positive, the input signal at the first input terminal is less than the input signal at the second input terminal. At this time, the output terminal of the comparator 210 outputs a low-level signal. The first control unit 220 controls the first common terminal to connect with the third free terminal and the second common terminal to connect with the sixth free terminal according to the low-level signal, so that the first power supply port A is connected to the negative terminal of the subsequent circuit 500 and the second power supply port B is connected to the positive terminal of the subsequent circuit 500, which meets the power supply polarity requirements of the subsequent circuit 500.

[0036] Please refer to this again. Figure 2In some embodiments, the reverse connection control circuit further includes a protection module. The protection module includes a second switch group 410 and a second control unit 420. One end of the second switch group 410 is connected to the first power supply port A, and the other end is connected to the first sub-switch S1. One end of the second control unit 420 is connected to the second switch group 410, and the other end is connected to the first sub-switch S1 and the second sub-switch S2, respectively. The second control unit 420 receives a second control signal and controls the connection state of the second switch group 410 according to the second control signal. Specifically, the second control unit 420 uses soft-start control, and the second control signal includes a start signal and / or a stop signal. In some specific embodiments, the start signal represents the power-on signal of the power supply, and the stop signal represents the power-off signal of the power supply. The second control unit 420 controls the closing and opening states of the second switch group 410 according to the second control signal to control the connection state of the first sub-switch S1 and the first power supply port A, thereby preventing damage to the subsequent circuit 500 caused by the instantaneous high voltage during power-on and / or power-off of the power supply. It is understood that the second control signal received by the second control unit 420 may be sent by an external circuit connected to the second control unit 420 or by other means, and this application does not impose specific restrictions.

[0037] In some embodiments, the second switch group 410 includes a third sub-switch S3, a fourth sub-switch S4, and a resistor R. The third sub-switch S3 is connected to the first power supply port A, the second control unit 420, and the first common terminal. The fourth sub-switch S4 is connected to the first power supply port A and the second control unit 420, and is connected in parallel with the third sub-switch S3. One end of the resistor R is connected to the fourth sub-switch S4, and the other end of the resistor R is connected to the third sub-switch S3 and the first common terminal. The second control unit 420 controls the connection state of the third sub-switch S3 and the fourth sub-switch S4 according to a second control signal. Specifically, the second control unit 420 performs soft-start control; the fourth sub-switch S4 is connected in series with the resistor R, and the third sub-switch S3 is connected in parallel with the series branch of the fourth sub-switch S4 and the resistor R. The second control signal includes a start signal and / or a stop signal. In some specific embodiments, the start signal is used to characterize the power supply power-on signal, and the stop signal is used to characterize the power supply power-off signal. When the second control unit 420 receives a start signal, it controls the fourth sub-switch S4 to close and the third sub-switch S3 to open. At this time, the power supply module 100 pre-charges the resistor R. When the second control unit 420 detects that the voltage at the downstream end of the resistor R is greater than the first preset threshold, it controls the third sub-switch S3 to close and the fourth sub-switch S4 to open. At this time, the first sub-switch S1 is connected to the first power supply port A, and the power supply module 100 provides power to the downstream circuit 500, thereby avoiding damage to the downstream circuit 500 caused by the instantaneous high voltage of the power supply. When the second control unit 420 receives a stop signal, it controls the fourth sub-switch S4 to close and the third sub-switch S3 to open. When the second control unit 420 detects that the voltage at the downstream end of the resistor R is lower than the second preset threshold, it controls the fourth sub-switch S4 to open. At this time, the downstream circuit 500 stops working, thereby avoiding damage to the downstream circuit 500 caused by the instantaneous high voltage of the power supply failure. It is understood that the first preset threshold and the second preset threshold can be adaptively selected according to actual needs, and the embodiments of this application do not impose specific limitations.

[0038] In one specific embodiment, the second control unit 420 receives a second control signal. When the second control signal is a start signal, the second control unit 420 controls the fourth sub-switch S4 to close and the third sub-switch S3 to open, and the power supply module 100 performs a pre-charge operation on the resistor R. When the second control unit 420 detects that the voltage at the back end of the resistor R is greater than a first preset threshold, the second control unit 420 controls the third sub-switch S3 to close and the fourth sub-switch S4 to open, so that the first power supply port A is connected to the first common terminal. At this time, the polarity detection module 200 detects the first polarity of the first power supply port A and the second polarity of the second power supply port B. If the power supply module 100 is positively connected, the polarity detection module 200 controls the first common terminal to connect to the first free terminal and the second common terminal to connect to the fourth free terminal; if the power supply module 100 is reversely connected, the polarity detection module 200 controls the first common terminal to connect to the third free terminal and the second common terminal to connect to the sixth free terminal, so as to meet the power supply polarity requirements of the subsequent circuit 500. When the second control unit 420 receives a stop signal, it controls the fourth sub-switch S4 to close and the third sub-switch S3 to open. When the second control unit 420 detects that the voltage at the back end of resistor R is less than the second preset threshold, it controls the fourth sub-switch S4 to open. At this time, the first common terminal is connected to the second free terminal, and the second common terminal is connected to the fifth free terminal, and the subsequent circuit has no power supply.

[0039] Reference Figure 5 This application provides a heating device. In some embodiments, the heating device includes: a power supply module 100, a polarity detection module 200, a first switch group 300, and a heating module. The power supply module 100 has a first power supply port A and a second power supply port B, and is used to provide power. The polarity detection module 200 is connected to the first power supply port A and the second power supply port B respectively, and is used to detect the first polarity of the first power supply port A and the second polarity of the second power supply port B respectively. The first switch group 300 is connected to the polarity detection module 200 and the heating module respectively. The first switch group 300 includes: a first sub-switch S1 and a second sub-switch S2. The first sub-switch S1 has a first common terminal and a first free terminal group. The first free terminal group includes: a first free terminal, a second free terminal, and a third free terminal. The first common terminal is used to connect to the first power supply port A. The second sub-switch S2 has a second common terminal and a second free terminal group. The second free terminal group includes: a fourth free terminal, a fifth free terminal, and a sixth free terminal. The fourth free end is connected to the third free end, the sixth free end is connected to the first free end, and the second common end is connected to the second power supply port B. The polarity detection module 200 is also used to control the connection status of the first common end and the first free end group, and the connection status of the second common end and the second free end group according to the first polarity and the second polarity.

[0040] Specifically, both the first sub-switch S1 and the second sub-switch S2 are three-position switchable switches. In the initial state, the first common terminal is connected to the second free terminal, and the second common terminal is connected to the fifth free terminal. At this time, both the first sub-switch S1 and the second sub-switch S2 are in a floating state, and the heating module has no power supply. When the power supply is turned on, the first common terminal is connected to the first power supply port A. The polarity detection module 200 detects the polarity of the first power supply port A and the second power supply port B, and controls the connection state of the first common terminal to the first free terminal group and the connection state of the second common terminal to the second free terminal group based on the first polarity of the first power supply port A and the second polarity of the second power supply port B. For example: Refer to... Figure 6 When the polarity detection module 200 detects that the first polarity of the first power supply port A is positive and the second polarity of the second power supply port B is negative, it indicates that the power supply module 100 is in a positive connection state. The polarity detection module 200 controls the first common terminal to connect with the first free terminal and the second common terminal to the fourth free terminal, so that the first power supply port A is connected to the positive terminal of the heating module and the second power supply port B is connected to the negative terminal of the heating module, which meets the polarity requirements of the heating module. (Refer to...) Figure 7 When the polarity detection module 200 detects that the first polarity of the first power supply port A is negative and the second polarity of the second power supply port B is positive, it indicates that the power supply module 100 is in a reverse connection state. The polarity detection module 200 controls the first common terminal to connect with the third free terminal and the second common terminal to connect with the sixth free terminal, so that the first power supply port A is connected to the negative terminal of the heating module and the second power supply port B is connected to the positive terminal of the heating module, which meets the polarity requirements of the heating module.

[0041] The heating device provided in this application embodiment detects the first polarity of the first power supply port A and the second polarity of the second power supply port B through the polarity detection module 200, and controls the connection state of the first sub-switch S1 and the second sub-switch S2 according to the first polarity and the second polarity, so that the heating module can work normally when the power supply module is connected in both positive and negative directions, thereby improving the working stability of the heating module.

[0042] Reference Figure 4 , Figure 5In some embodiments, the polarity detection module 200 includes a comparator 210 and a first control unit 220. The comparator 210 has a first input terminal, a second input terminal, and an output terminal. The first input terminal is connected to a first power supply port A, and the second input terminal is connected to a second power supply port B. The comparator 210 is used to detect the first polarity of the first power supply port A and the second polarity of the second power supply port B, and generates a first control signal based on the first and second polarities. One end of the first control unit 220 is connected to the output terminal of the comparator 210, and the other end of the first control unit 220 is connected to a first sub-switch S1 and a second sub-switch S2, respectively, and is used to control the connection state of the first common terminal and the first free terminal group, and the connection state of the second common terminal and the second free terminal group, according to the first control signal.

[0043] Specifically, the first input terminal of comparator 210 is a non-inverting input terminal, the second input terminal of comparator 210 is an inverting input terminal, and the first control unit 220 is a logic control unit. In the initial state, the input signal at the first input terminal is equal to the input signal at the second input terminal, meaning the power supply module 100 has no power output. At this time, the first control unit 220 controls the first common terminal to connect to the second free terminal and the second common terminal to the fifth free terminal, so that both the first sub-switch S1 and the second sub-switch S2 are in a floating open state. When the first power supply port A is positive and the second power supply port B is negative, the input signal at the first input terminal is greater than the input signal at the second input terminal. At this time, the output terminal of comparator 210 outputs a high-level signal. The first control unit 220 controls the first common terminal to connect to the first free terminal and the second common terminal to the fourth free terminal based on the high-level signal, so that the first power supply port A is connected to the positive terminal of the heating module and the second power supply port B is connected to the negative terminal of the heating module, meeting the power supply polarity requirements of the heating module. When the first power supply port A is negative and the second power supply port B is positive, the input signal at the first input terminal is less than the input signal at the second input terminal. At this time, the output terminal of the comparator 210 outputs a low-level signal. The first control unit 220 controls the first common terminal to connect with the third free terminal and the second common terminal to connect with the sixth free terminal according to the low-level signal, so that the first power supply port A is connected to the negative terminal of the heating module and the second power supply port B is connected to the positive terminal of the heating module, which meets the power supply polarity requirements of the heating module.

[0044] Please refer to this again. Figure 5In some embodiments, the heating device further includes a protection module. The protection module includes a second switch group 410 and a second control unit 420. One end of the second switch group 410 is connected to the first power supply port A, and the other end is connected to the first sub-switch S1. One end of the second control unit 420 is connected to the second switch group 410, and the other end is connected to the first sub-switch S1 and the second sub-switch S2 respectively. The second control unit 420 receives a second control signal and controls the connection state of the second switch group 410 according to the second control signal. Specifically, the second control unit 420 uses soft-start control, and the second control signal includes a start signal and / or a stop signal. In some specific embodiments, the start signal represents the power-on signal of the power supply, and the stop signal represents the power-off signal of the power supply. The second control unit 420 controls the closing and opening states of the second switch group 410 according to the second control signal to control the connection state of the first sub-switch S1 and the first power supply port A, thereby preventing damage to the heating module caused by the instantaneous high voltage when the power supply is powered on and / or off. It is understood that the second control signal received by the second control unit 420 may be sent by an external circuit connected to the second control unit 420 or by other means, and this application does not impose specific restrictions.

[0045] In some embodiments, the second switch group 410 includes a third sub-switch S3, a fourth sub-switch S4, and a resistor R. The third sub-switch S3 is connected to the first power supply port A, the second control unit 420, and the first common terminal. The fourth sub-switch S4 is connected to the first power supply port A and the second control unit 420, and is connected in parallel with the third sub-switch S3. One end of the resistor R is connected to the fourth sub-switch S4, and the other end of the resistor R is connected to the third sub-switch S3 and the first common terminal. The second control unit 420 controls the connection state of the third sub-switch S3 and the fourth sub-switch S4 according to a second control signal. Specifically, the second control unit 420 performs soft-start control; the fourth sub-switch S4 is connected in series with the resistor R, and the third sub-switch S3 is connected in parallel with the series branch of the fourth sub-switch S4 and the resistor R. The second control signal includes a start signal and / or a stop signal. In some specific embodiments, the start signal is used to characterize the power supply power-on signal, and the stop signal is used to characterize the power supply power-off signal. When the second control unit 420 receives a start signal, it controls the fourth sub-switch S4 to close and the third sub-switch S3 to open. At this time, the power supply module 100 pre-charges the resistor R. When the second control unit 420 detects that the voltage across the resistor R is greater than a first preset threshold, it controls the third sub-switch S3 to close and the fourth sub-switch S4 to open. At this time, the first sub-switch S1 connects to the first power supply port A, and the power supply module 100 provides power to the heating module, thus preventing damage to the heating module from the instantaneous high voltage during power-on. When the second control unit 420 receives a stop signal, it controls the fourth sub-switch S4 to close and the third sub-switch S3 to open. When the second control unit 420 detects that the voltage across the resistor R is lower than a second preset threshold, it controls the fourth sub-switch S4 to open. At this time, the heating module stops working, thus preventing damage to the heating module from the instantaneous high voltage during power-off. It is understood that the first and second preset thresholds can be adaptively selected according to actual needs, and this embodiment does not impose specific limitations.

[0046] In some embodiments, the heating module includes a plurality of heating units 610 connected in parallel. Each heating unit 610 includes a transistor and a heating element. The collector of the transistor is connected to a first free terminal and a sixth free terminal, respectively. The emitter of the transistor is connected to one end of the heating element, and the other end of the heating element is connected to a third free terminal and a fourth free terminal, respectively. Specifically, refer to... Figure 6 When the first power supply port A is positive and the second power supply port B is negative, the collector of the transistor is connected to the first power supply port A through the first free terminal, and the other end of the heating element is connected to the second power supply port B through the fourth free terminal; refer to Figure 7When the first power supply port A is negative and the second power supply port B is positive, the collector of the transistor is connected to the second power supply port B through the sixth free terminal, and the other end of the heating element is connected to the first power supply port A through the third free terminal, so that the power supply module 100 meets the power supply polarity requirements of the heating module whether it is connected in the positive or negative direction.

[0047] In one specific embodiment, the heating device can be used to raise the water temperature of the proton exchange membrane fuel cell. The second control unit 420 receives a second control signal. When the second control signal is a start signal, the second control unit 420 controls the fourth sub-switch S4 to close and the third sub-switch S3 to open, and the power supply module 100 performs a pre-charge operation on the resistor R. When the second control unit 420 detects that the voltage at the back end of the resistor R is greater than a first preset threshold, the second control unit 420 controls the third sub-switch S3 to close and the fourth sub-switch S4 to open, so that the first power supply port A is connected to the first common terminal. At this time, the polarity detection module 200 detects the first polarity of the first power supply port A and the second polarity of the second power supply port B. If the power supply module 100 is positively connected, the polarity detection module 200 controls the first common terminal to connect to the first free terminal and the second common terminal to connect to the fourth free terminal; if the power supply module 100 is reversely connected, the polarity detection module 200 controls the first common terminal to connect to the third free terminal and the second common terminal to connect to the sixth free terminal, to meet the power supply polarity requirements of the heating module. When the second control unit 420 receives a stop signal, it controls the fourth sub-switch S4 to close and the third sub-switch S3 to open. When the second control unit 420 detects that the voltage at the back end of resistor R is less than the second preset threshold, it controls the fourth sub-switch S4 to open. At this time, the first common terminal is connected to the second free terminal, and the second common terminal is connected to the fifth free terminal, and the heating module has no power supply.

[0048] The reverse connection control circuit and heating device provided in this application embodiment detect the first polarity of the first power supply port and the second polarity of the second power supply port through a polarity detection module, and control the connection state of the first sub-switch and the second sub-switch according to the first polarity and the second polarity, so that the subsequent circuit and / or heating module can work normally when the power supply module is connected in the correct direction or in the reverse direction, thereby improving the working stability of the subsequent circuit and / or heating module.

[0049] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A reverse connection control circuit, characterized in that, include: The power supply module is equipped with a first power supply port and a second power supply port for providing power. A polarity detection module is connected to the first power supply port and the second power supply port respectively, and is used to detect the first polarity of the first power supply port and the second polarity of the second power supply port respectively; The polarity detection module includes a comparator and a first control unit. The comparator has a first input terminal, a second input terminal, and an output terminal. The first input terminal is connected to the first power supply port, and the second input terminal is connected to the second power supply port. The comparator is used to detect the first polarity and the second polarity, and generate a first control signal based on the first polarity and the second polarity. The first switch group is connected to the polarity detection module and the subsequent circuit respectively; wherein, the first switch group includes: a first sub-switch and a second sub-switch, the first sub-switch is provided with a first common terminal and a first free terminal group, the first free terminal group includes: a first free terminal, a second free terminal and a third free terminal, and the first common terminal is used to connect to the first power supply port; The second sub-switch is provided with a second common terminal and a second free terminal group. The second free terminal group includes a fourth free terminal, a fifth free terminal, and a sixth free terminal. The fourth free terminal is connected to the third free terminal, the sixth free terminal is connected to the first free terminal, and the second common terminal is connected to the second power supply port. One end of the first control unit is connected to the output terminal, and the other end of the first control unit is connected to the first sub-switch and the second sub-switch respectively. The first control unit is used to control the connection state between the first common terminal and the first free terminal group and the connection state between the second common terminal and the second free terminal group according to the first control signal. The protection module includes a second switch group and a second control unit. One end of the second switch group is connected to the first power supply port, and the other end of the second switch group is connected to the first sub-switch; One end of the second control unit is connected to the second switch group, and the other end of the second control unit is connected to the first sub-switch and the second sub-switch respectively, for receiving the second control signal and controlling the connection state of the second switch group according to the second control signal; The second switch group includes a third sub-switch, a fourth sub-switch, and a resistor. The third sub-switch is connected to the first power supply port, the second control unit, and the first common terminal, respectively; the fourth sub-switch is connected to the first power supply port and the second control unit, respectively. The fourth sub-switch is connected in parallel with the third sub-switch, one end of the resistor is connected to the fourth sub-switch, and the other end of the resistor is connected to the third sub-switch and the first common terminal respectively; The second control unit is further configured to control the connection status of the third sub-switch and the fourth sub-switch according to the second control signal, including: When the second control unit receives a start signal, the second control unit controls the fourth sub-switch to close and the third sub-switch to open, so that the power supply module can pre-charge the resistor. When the second control unit detects that the voltage at the back end of the resistor is greater than the first preset threshold, the second control unit controls the third sub-switch to close and the fourth sub-switch to open. The first sub-switch is connected to the first power supply port so that the power supply module can provide power to the subsequent circuit. When the second control unit receives a stop signal, the second control unit controls the fourth sub-switch to close and the third sub-switch to open. When the second control unit detects that the voltage at the back end of the resistor is lower than the second preset threshold, the second control unit controls the fourth sub-switch to open and the subsequent circuit stops working.

2. A heating device, characterized in that, The heating device includes: The power supply module is equipped with a first power supply port and a second power supply port for providing power. A polarity detection module is connected to the first power supply port and the second power supply port respectively, and is used to detect the first polarity of the first power supply port and the second polarity of the second power supply port respectively; The polarity detection module includes a comparator and a first control unit. The comparator has a first input terminal, a second input terminal, and an output terminal. The first input terminal is connected to the first power supply port, and the second input terminal is connected to the second power supply port. The comparator is used to detect the first polarity and the second polarity, and generate a first control signal based on the first polarity and the second polarity. The first switch group is connected to the polarity detection module and the subsequent circuit respectively; wherein, the first switch group includes: a first sub-switch and a second sub-switch, the first sub-switch is provided with a first common terminal and a first free terminal group, the first free terminal group includes: a first free terminal, a second free terminal and a third free terminal, and the first common terminal is used to connect to the first power supply port; The second sub-switch is provided with a second common terminal and a second free terminal group. The second free terminal group includes a fourth free terminal, a fifth free terminal, and a sixth free terminal. The fourth free terminal is connected to the third free terminal, the sixth free terminal is connected to the first free terminal, and the second common terminal is connected to the second power supply port. One end of the first control unit is connected to the output terminal, and the other end of the first control unit is connected to the first sub-switch and the second sub-switch respectively. The first control unit is used to control the connection state between the first common terminal and the first free terminal group and the connection state between the second common terminal and the second free terminal group according to the first control signal. The heating module is connected to the first switch group; The heating device also includes a protection module, which comprises a second switch group and a second control unit. One end of the second switch group is connected to the first power supply port, and the other end of the second switch group is connected to the first sub-switch; One end of the second control unit is connected to the second switch group, and the other end of the second control unit is connected to the first sub-switch and the second sub-switch respectively, for receiving the second control signal and controlling the connection state of the second switch group according to the second control signal; The second switch group includes a third sub-switch, a fourth sub-switch, and a resistor. The third sub-switch is connected to the first power supply port, the second control unit, and the first common terminal, respectively; the fourth sub-switch is connected to the first power supply port and the second control unit, respectively. The fourth sub-switch is connected in parallel with the third sub-switch, one end of the resistor is connected to the fourth sub-switch, and the other end of the resistor is connected to the third sub-switch and the first common terminal respectively; The polarity detection module is also used to control the connection state between the first common terminal and the first free terminal group, and the connection state between the second common terminal and the second free terminal group, based on the first polarity and the second polarity. The second control unit is used to control the connection status of the third sub-switch and the fourth sub-switch according to the second control signal, including: When the second control unit receives a start signal, the second control unit controls the fourth sub-switch to close and the third sub-switch to open, so that the power supply module can pre-charge the resistor. When the second control unit detects that the voltage at the back end of the resistor is greater than the first preset threshold, the second control unit controls the third sub-switch to close and the fourth sub-switch to open. The first sub-switch is connected to the first power supply port so that the power supply module can provide power to the subsequent circuit. When the second control unit receives a stop signal, the second control unit controls the fourth sub-switch to close and the third sub-switch to open. When the second control unit detects that the voltage at the back end of the resistor is lower than the second preset threshold, the second control unit controls the fourth sub-switch to open and the subsequent circuit stops working.

3. The heating device according to claim 2, characterized in that, The heating module includes: a plurality of heating units, wherein the plurality of heating units are connected in parallel; Each of the heating units includes a transistor and a heating element. The collector of the transistor is connected to the first free terminal and the sixth free terminal, respectively. The emitter of the transistor is connected to one end of the heating element, and the other end of the heating element is connected to the third free terminal and the fourth free terminal, respectively.

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