A power supply circuit and a power supply device

Abstract

This utility model discloses a power supply circuit and a power supply device. The power supply circuit includes a power input terminal, a transformer, a control module, a first output terminal, a rectifier bridge, and a second output terminal. The transformer includes a first coil, a second coil, a third coil, and a fourth coil. The first end of the first coil is connected to the output terminal of the rectifier bridge, and the second end of the first coil is grounded through a first capacitor. The third end of the second coil is connected to the output terminal of the rectifier bridge, and the fourth end of the second coil is grounded. The second and third ends of the first coil are of the same name. The power supply terminal of the control module is connected to the output terminal of the rectifier bridge. The input terminal of the control module is connected to the connection point between the second end of the first coil and the first capacitor. The output terminal of the control module is grounded. The first output terminal is connected to the third coil, and the fourth coil is connected to the second output terminal. This utility model can simultaneously provide positive and negative voltages.

Description

Technical Field

[0001] This utility model relates to the field of power supply technology, and in particular to a power supply circuit and power supply equipment. Background Technology

[0002] The internal circuitry of a charging station typically requires multiple voltages, including positive and negative voltages, to drive different electronic components and perform various functions. In related technologies, a dual power supply circuit is mainly used to provide both positive and negative voltages. However, a dual power supply circuit increases production costs. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a power supply circuit and power supply device capable of simultaneously providing positive and negative voltages.

[0004] This utility model also proposes a power supply device having the above-mentioned power supply circuit.

[0005] The power supply circuit according to a first aspect embodiment of the present invention includes:

[0006] Power input terminal;

[0007] A rectifier bridge, wherein the input terminal of the rectifier bridge is connected to the power supply input terminal;

[0008] The transformer includes a first coil, a second coil, a third coil, and a fourth coil. The first end of the first coil is connected to the output end of the rectifier bridge, and the second end of the first coil is grounded through a first capacitor. The third end of the second coil is connected to the output end of the rectifier bridge, and the fourth end of the second coil is grounded. The second end of the first coil and the third end of the second coil are terminals of the same name.

[0009] The control module has its power supply terminal connected to the output terminal of the rectifier bridge, its input terminal connected to the connection point between the second terminal of the first coil and the first capacitor, and its output terminal grounded.

[0010] The first output terminal is connected to the third coil.

[0011] A rectifier module, wherein the rectifier module is connected between the third coil and the first output terminal;

[0012] The second output terminal is connected to the fourth coil.

[0013] The power supply circuit according to the embodiment of this utility model has at least the following beneficial effects: AC power is connected to the power input terminal, and the AC power is converted into DC power by a rectifier bridge and supplied to the first coil of the transformer. Since the input terminal of the control module is connected to the first coil and the output terminal of the control module is grounded, by controlling the conduction of the input and output terminals of the control module, the first coil can generate a self-induced electromotive force, and subsequently the third coil generates an induced current. The second terminal of the first coil and the third terminal of the second coil are of the same name, and the fourth terminal of the second coil is grounded. Therefore, the third coil corresponding to the first coil and the fourth coil corresponding to the second coil will generate opposite voltages, that is, the third coil generates a positive voltage and the fourth coil generates a negative voltage, thereby providing both positive and negative voltages simultaneously through a single circuit.

[0014] According to some embodiments of the present invention, the power supply circuit further includes a first filter module, which is disposed between the output terminal of the rectifier bridge and the first coil.

[0015] According to some embodiments of the present invention, the first filtering module includes a first resistor, a second resistor, a second capacitor, and a first diode. The first end of the second capacitor is connected to the connection point between the output terminal of the rectifier bridge and the first coil. The second end of the second capacitor is connected to the second end of the first resistor and the negative terminal of the first diode. The first end of the first resistor is connected to the connection point between the second capacitor and the first coil. The positive terminal of the first diode is connected to the first end of the second resistor. The second end of the second resistor is connected to the second end of the first coil, the input terminal of the control module, and the first end of the first capacitor.

[0016] According to some embodiments of the present invention, the power supply circuit further includes a second filter module, which is disposed between the output terminal of the rectifier bridge and the second coil.

[0017] According to some embodiments of this utility model, the second filter module includes a third resistor, a fourth resistor, a third capacitor, a fourth capacitor, a fifth capacitor, and a second diode. The first end of the third resistor is connected to the connection point between the second coil and the detection terminal of the control module. The second end of the third resistor is connected to the first end of the third capacitor and the positive terminal of the second diode. The second end of the third capacitor is connected to the second end of the fourth resistor. The fourth capacitor and the fifth capacitor are connected in parallel to form a filter branch. The first end of the filter branch is connected to the negative terminal of the second diode, the first end of the fourth resistor, and the output terminal of the rectifier bridge. The second end of the filter branch is grounded.

[0018] According to some embodiments of the present invention, the power supply circuit further includes a feedback optocoupler, the light-emitting end of the feedback optocoupler being connected to the first output end, and the light-receiving end of the feedback optocoupler being connected to the feedback end of the control module.

[0019] According to some embodiments of the present invention, the power supply circuit further includes a sixth capacitor, a fifth resistor, and a third diode. The negative terminal of the third diode is connected to the sixth terminal of the fourth coil, and the positive terminal of the third diode is connected to the second output terminal. The sixth capacitor and the fifth resistor are arranged in parallel to form a first branch. The first terminal of the first branch is connected to the fifth terminal of the fourth coil and the ground terminal, respectively, and the second terminal of the first branch is connected to the positive terminal of the third diode and the second output terminal, respectively.

[0020] According to some embodiments of the present invention, the power supply circuit further includes a third filtering module, which includes a first inductor, a seventh capacitor, an eighth capacitor, and a ninth capacitor. The first end of the rectifier bridge is connected to the second end of the seventh capacitor, the second end of the eighth capacitor, and the second end of the ninth capacitor, respectively. The second end of the rectifier bridge is connected to the first end of the seventh capacitor and the first end of the first inductor, respectively. The second end of the first inductor is connected to the first end of the eighth capacitor, the first end of the ninth capacitor, and the first end of the first coil, respectively.

[0021] According to some embodiments of this utility model, a fuse is also connected between the power input terminal and the rectifier bridge.

[0022] The power supply device according to a second aspect embodiment of the present invention includes the power supply circuit described in the first aspect.

[0023] The power supply device according to the embodiments of this utility model has at least the following beneficial effects: It includes a power supply circuit, where AC power is connected to the power input terminal. The AC power is converted to DC power by a rectifier bridge and supplied to the first coil of the transformer. Since the input terminal of the control module is connected to the first coil and the output terminal of the control module is grounded, by controlling the conduction of the input and output terminals of the control module, the first coil can generate a self-induced electromotive force, which in turn induces a current in the third coil. The second terminal of the first coil and the third terminal of the second coil are of the same name, and the fourth terminal of the second coil is grounded. Therefore, the third coil corresponding to the first coil and the fourth coil corresponding to the second coil will generate opposite voltages, i.e., the third coil generates a positive voltage and the fourth coil generates a negative voltage, thus providing both positive and negative voltages simultaneously through a single circuit.

[0024] Additional aspects and advantages of this 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

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0026] Figure 1 This is a circuit diagram of the power supply circuit according to an embodiment of the present utility model. Detailed Implementation

[0027] The embodiments of this utility model 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 this utility model, and should not be construed as limiting this utility model.

[0028] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 limitations on this utility model.

[0029] In the description of this utility model, "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. If "first" or "second" is used in the description, it is only for the purpose of 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.

[0030] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0031] The internal circuitry of a charging station typically requires multiple voltages, including positive and negative voltages, to drive different electronic components and perform various functions. In related technologies, a dual power supply circuit is mainly used to provide both positive and negative voltages. However, a dual power supply circuit increases production costs.

[0032] Based on this, the present invention provides a power supply circuit and power supply equipment. The power input terminal receives AC power, which is then converted to DC power by a rectifier bridge and supplied to the first coil of the transformer. Since the input terminal of the control module is connected to the first coil and the output terminal of the control module is grounded, by controlling the conduction of the input and output terminals of the control module, the first coil can generate a self-induced electromotive force, which in turn induces a current in the third coil. The second terminal of the first coil and the third terminal of the second coil are of the same name, and the fourth terminal of the second coil is grounded. Therefore, the third coil corresponding to the first coil and the fourth coil corresponding to the second coil will generate opposite voltages; that is, the third coil generates a positive voltage, and the fourth coil generates a negative voltage, thus providing both positive and negative voltages simultaneously through a single circuit.

[0033] Firstly, referring to Figure 1 , Figure 1 A power supply circuit is provided for an embodiment of this utility model.

[0034] Understandably, the power supply circuit includes a power input terminal, a rectifier bridge BD1, a transformer T1, a control module U1, a first output terminal (+12V), a rectifier module U2, and a second output terminal (-12V). The transformer T1 includes a first coil 100, a second coil 200, a third coil 300, and a fourth coil 400. The output terminal of the rectifier bridge BD1 is connected to the power supply terminal VDD of the control module U1 and the first terminal of the first coil 100, respectively. The third terminal of the second coil 200 is connected to the output terminal of the rectifier bridge BD1 and the detection terminal ZCD of the control chip, respectively. The fourth terminal of coil 200 is grounded. Coil 300 corresponds to coil 100, and coil 200 corresponds to coil 400. The fifth terminal of coil 300 is connected to the first output terminal +12V via rectifier module U2. The sixth terminal of coil 300 is grounded, the seventh terminal of coil 400 is grounded, and the eighth terminal of coil 400 is connected to the second output terminal -12V. The second terminal of coil 100 and the third terminal of coil 200 are of the same name, and the fifth terminal of coil 300 and the seventh terminal of coil 400 are of the same name. Additionally, a fuse F1 is connected between the power input terminal and rectifier bridge BD1.

[0035] Specifically, the external power supply equipment supplies AC power to the power supply circuit through the power input terminal. After rectification by the rectifier bridge BD1, the AC power supplies DC power to the power supply terminal VDD of the control module U1 and the first terminal of the first coil 100. Since the input terminal DRN of the control module U1 is connected to the first coil 100 and the output terminal CS of the control module U1 is grounded, the direction of the current in the first coil 100 can be changed by controlling the conduction of the input terminal DRN and the output terminal CS of the control module U1, thereby generating a self-induced electromotive force. The third coil 300 generates an induced electromotive force. The induced current generated by the third coil 300 is rectified by the rectifier module U2 and output through the first output terminal +12V.

[0036] Specifically, since the third terminal of the second coil 200 is the same terminal as the second terminal of the first coil 100 and the fourth terminal of the second coil 200 is grounded, when the second terminal of the first coil 100 is positive, the third terminal of the second coil 200 is positive; similarly, when the second terminal of the first coil 100 is negative, the third terminal of the second coil 200 is also negative. Therefore, when the third coil 300 generates a positive induced current, the fourth coil 400 generates a negative induced current, thereby achieving the effect of simultaneously outputting positive and negative voltages.

[0037] It should be noted that the power supply circuit also includes a first filter module, which includes a first resistor R1, a second resistor R2, a second capacitor C2, and a first diode D1. The first end of the second capacitor C2 is connected to the connection point between the output terminal of the rectifier bridge BD1 and the first coil 100. The second end of the second capacitor C2 is connected to the second end of the first resistor R1 and the negative terminal of the first diode D1. The first end of the first resistor R1 is connected to the connection point between the second capacitor C2 and the first coil 100. The positive terminal of the first diode D1 is connected to the first end of the second resistor R2. The second end of the second resistor R2 is connected to the second end of the first coil 100, the input terminal DRN of the control module U1, and the first end of the first capacitor C1. The unidirectional conductivity of the first diode D1 serves as a rectifier.

[0038] It should be noted that the power supply circuit also includes a second filter module, which includes a third resistor R3, a fourth resistor R4, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, and a second diode D2. The first end of the third resistor R3 is connected to the connection point between the second coil 200 and the detection terminal ZCD of the control module U1. The second end of the third resistor R3 is connected to the first end of the third capacitor C3 and the positive terminal of the second diode D2. The second end of the third capacitor C3 is connected to the second end of the fourth resistor R4. The fourth capacitor C4 and the fifth capacitor C5 are connected in parallel to form a filter branch. The first end of the filter branch is connected to the negative terminal of the second diode D2, the first end of the fourth resistor R4, and the output terminal of the rectifier bridge BD1. The second end of the filter branch is grounded. The unidirectional conductivity of the second diode D2 serves as a rectifier.

[0039] It should be noted that the power supply circuit also includes a third filtering module, which includes a first inductor L1, a seventh capacitor C7, an eighth capacitor C8, and a ninth capacitor C9. The first terminal of the rectifier bridge BD1 is connected to the second terminal of the seventh capacitor C7, the second terminal of the eighth capacitor C8, and the second terminal of the ninth capacitor C9, respectively. The second terminal of the rectifier bridge BD1 is connected to the first terminal of the seventh capacitor C7 and the first terminal of the first inductor L1, respectively. The second terminal of the first inductor L1 is connected to the first terminal of the eighth capacitor C8, the first terminal of the ninth capacitor C9, the first terminal of the first coil 100, the first terminal of the second capacitor C2, and the first terminal of the first resistor R1, respectively.

[0040] Specifically, the power supply circuit also includes a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8. The sixth resistor R6, the seventh resistor R7, and the eighth resistor R8 are connected in series to form a series branch. The first end of the series branch is connected to the first end of the ninth capacitor C9, the second end of the first inductor L1, the first end of the eighth capacitor C8, the first end of the first coil 100, the first end of the second capacitor C2, and the first end of the first resistor R1, respectively.

[0041] It should be noted that the power supply circuit also includes a feedback optocoupler. The light-emitting end U1A of the feedback optocoupler is connected to the first output terminal +12V, and the light-receiving end U1B of the feedback optocoupler is connected to the feedback terminal FB of the control module U1. When the voltage output by the first output terminal +12V is greater than a preset voltage, the light-emitting end U1A of the feedback optocoupler is lit, and the light-receiving end U1B of the feedback optocoupler is turned on. Subsequently, the level signal of the feedback terminal FB of the control module U1 changes. In some embodiments, when the level signal of the feedback terminal FB of the control module U1 changes, the control module U1 reduces the conduction speed of the output and input terminals of the control module U1, thereby reducing the voltage output by the first output terminal +12V.

[0042] Specifically, the power supply circuit also includes a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a twelfth resistor R12, and a thirteenth resistor R13. The ninth capacitor C9 and the tenth capacitor C10 are connected in parallel to form a parallel branch. The first end of the parallel branch is connected to the rectifier output terminal and the first output terminal +12V of the rectifier module U2, respectively. The second end of the parallel branch is grounded. The first end of the twelfth resistor R12 is connected to the first output terminal +12V and the first end of the thirteenth resistor R13, respectively. The second end of the twelfth resistor R12 is connected to one end of the light-emitting terminal U1A of the feedback optocoupler and the second end of the eleventh capacitor C11, respectively. The first end of the eleventh capacitor C11 is connected to the second end of the thirteenth resistor R13. The other end of the light-emitting terminal U1A of the feedback optocoupler is grounded through the twelfth capacitor C12.

[0043] It should be noted that the power supply circuit also includes a sixth capacitor C6, a fifth resistor R5, and a third diode D3. The negative terminal of the third diode D3 is connected to the eighth terminal of the fourth coil 400, and the positive terminal of the third diode D3 is connected to the second output terminal -12V. The sixth capacitor C6 and the fifth resistor R5 are connected in parallel to form the first branch. The first terminal of the first branch is connected to the seventh terminal of the fourth coil 400 and the ground terminal, respectively. The second terminal of the first branch is connected to the positive terminal of the third diode D3 and the second output terminal -12V, respectively. The unidirectional conductivity of the third diode D3 serves as a rectifier.

[0044] It is understood that the power supply circuit also includes a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a seventh capacitor C7, and an eighth capacitor C8. The first end of the ninth resistor R9 is connected to the first end of the third resistor R3 and the third end of the second coil 200, respectively. The second end of the ninth resistor R9 is connected to the detection terminal ZCD of the control module U1, the first end of the tenth resistor R10, and the first end of the seventh capacitor C7, respectively. The eighth capacitor C8 is connected between the feedback terminal FB of the control module U1 and the ground terminal. The first end of the eleventh resistor R11 is connected to the first end of the first capacitor C1 and the output terminal CS of the control module U1, respectively.

[0045] It should be noted that the control module U1 is a control chip with a built-in MOSFET. The drain of the MOSFET is the input terminal of the control module U1, and the source of the MOSFET is the output terminal of the control module U1. The control module U1 controls the conduction frequency of the MOSFET by controlling the frequency of the gate level change of the MOSFET.

[0046] Secondly, this utility model discloses a power supply device, including the power supply circuit of the first aspect embodiment described above.

[0047] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A power supply circuit, characterized in that, include: Power input terminal; A rectifier bridge, wherein the input terminal of the rectifier bridge is connected to the power supply input terminal; The transformer includes a first coil, a second coil, a third coil, and a fourth coil. The first end of the first coil is connected to the output end of the rectifier bridge, and the second end of the first coil is grounded through a first capacitor. The third end of the second coil is connected to the output end of the rectifier bridge, and the fourth end of the second coil is grounded. The second end of the first coil and the third end of the second coil are terminals of the same name. The control module has its power supply terminal connected to the output terminal of the rectifier bridge, its input terminal connected to the connection point between the second terminal of the first coil and the first capacitor, and its output terminal grounded. The first output terminal is connected to the third coil. A rectifier module, wherein the rectifier module is connected between the third coil and the first output terminal; The second output terminal is connected to the fourth coil.

2. The power supply circuit according to claim 1, characterized in that, The power supply circuit also includes a first filter module, which is disposed between the output terminal of the rectifier bridge and the first coil.

3. The power supply circuit according to claim 2, characterized in that, The first filtering module includes a first resistor, a second resistor, a second capacitor, and a first diode. The first end of the second capacitor is connected to the connection point between the output terminal of the rectifier bridge and the first coil. The second end of the second capacitor is connected to the second end of the first resistor and the negative terminal of the first diode. The first end of the first resistor is connected to the connection point between the second capacitor and the first coil. The positive terminal of the first diode is connected to the first end of the second resistor. The second end of the second resistor is connected to the second end of the first coil, the input terminal of the control module, and the first end of the first capacitor.

4. The power supply circuit according to claim 1, characterized in that, The power supply circuit also includes a second filter module, which is disposed between the output terminal of the rectifier bridge and the second coil.

5. The power supply circuit according to claim 4, characterized in that, The second filtering module includes a third resistor, a fourth resistor, a third capacitor, a fourth capacitor, a fifth capacitor, and a second diode. The first end of the third resistor is connected to the connection point between the second coil and the detection terminal of the control module. The second end of the third resistor is connected to the first end of the third capacitor and the positive terminal of the second diode. The second end of the third capacitor is connected to the second end of the fourth resistor. The fourth capacitor and the fifth capacitor are connected in parallel to form a filtering branch. The first end of the filtering branch is connected to the negative terminal of the second diode, the first end of the fourth resistor, and the output terminal of the rectifier bridge. The second end of the filtering branch is grounded.

6. The power supply circuit according to claim 1, characterized in that, The power supply circuit also includes a feedback optocoupler, the light-emitting end of which is connected to the first output end, and the light-receiving end of which is connected to the feedback end of the control module.

7. The power supply circuit according to claim 1, characterized in that, The power supply circuit also includes a sixth capacitor, a fifth resistor, and a third diode. The negative terminal of the third diode is connected to the sixth terminal of the fourth coil, and the positive terminal of the third diode is connected to the second output terminal. The sixth capacitor and the fifth resistor are arranged in parallel to form a first branch. The first terminal of the first branch is connected to the fifth terminal of the fourth coil and the ground terminal, respectively, and the second terminal of the first branch is connected to the positive terminal of the third diode and the second output terminal, respectively.

8. The power supply circuit according to claim 1, characterized in that, The power supply circuit further includes a third filtering module, which includes a first inductor, a seventh capacitor, an eighth capacitor, and a ninth capacitor. The first end of the rectifier bridge is connected to the second end of the seventh capacitor, the second end of the eighth capacitor, and the second end of the ninth capacitor, respectively. The second end of the rectifier bridge is connected to the first end of the seventh capacitor and the first end of the first inductor, respectively. The second end of the first inductor is connected to the first end of the eighth capacitor, the first end of the ninth capacitor, and the first end of the first coil, respectively.

9. The power supply circuit according to claim 1, characterized in that, A fuse is also connected between the power input terminal and the rectifier bridge.

10. A power supply device, characterized in that, Includes the power supply circuit as described in any one of claims 1 to 9.

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