Power supply control circuit and power supply control system

Abstract

The utility model discloses a power supply control circuit and a power supply control system, the system belongs to the technical field of charging control, the system comprises a switch circuit, the first end of the switch circuit is used for connecting a power grid; the first end of the filter circuit is connected with the first end of the switching circuit; the input end of the rectifying circuit is connected with the second end of the filtering circuit, and the positive electrode end, the negative electrode end and the grounding end of the rectifying circuit are used for being connected with a load; the control end of the control circuit is connected with the control end of the switching circuit and the control end of the rectifying circuit, and the control circuit is arranged to respond to first alternating current output by a power grid, control the switching circuit to be switched on and then output a control signal to the rectifying circuit. And the rectifying circuit converts the first alternating current into the first direct current.

Description

Technical Field

[0001] The utility model relates to the technical field of charging control, and more specifically, to a power supply control circuit and a power supply control system. Background Art

[0002] The power grid usually needs to be equipped with a conversion circuit to convert the alternating current output by the power grid into direct current or alternating current that meets the demand.

[0003] At present, in order to realize the conversion of the AC power output by the power grid, the existing power supply control circuit can convert the AC power output by the power grid into DC power through an AC-DC conversion circuit, but the DC power output by the existing AC-DC conversion circuit is all positive, which makes the voltage range of the DC power obtained by the load narrow. Utility Model Content

[0004] Embodiments of the present disclosure provide a power supply control circuit and a power supply control system.

[0005] According to a first aspect of the utility model, there is provided a power supply control circuit, comprising:

[0006] A switch circuit, wherein a first end of the switch circuit is used to connect to a power grid;

[0007] A filter circuit, a first end of the filter circuit being connected to a first end of the switch circuit;

[0008] a rectifier circuit, wherein an input end of the rectifier circuit is connected to the second end of the filter circuit, and a positive terminal, a negative terminal and a ground terminal of the rectifier circuit are respectively used to connect to a load; and

[0009] A control circuit, wherein the control end of the control circuit is respectively connected to the control end of the switch circuit and the control end of the rectifier circuit, and the control circuit is configured to respond to the first alternating current output by the power grid, control the switching circuit to be turned on, and then output a control signal to the rectifier circuit, so that the rectifier circuit converts the first alternating current into a first direct current.

[0010] Optionally, the rectifier circuit is a Vienna rectifier circuit.

[0011] Optionally, the first voltage sampling terminal of the control circuit is connected to the power grid, the second voltage sampling terminal of the control circuit is connected to the load, and the control circuit is configured to control the conversion efficiency of the rectifier circuit based on first feedback signals of the first voltage sampling terminal and the second voltage sampling terminal.

[0012] Optionally, the switching circuit includes a first switch, a second switch and a first resistor, the first end of the first switch serves as the first end of the switching circuit, the second end of the first switch serves as the second end of the switching circuit, the first end of the second switch is connected to the first end of the first switch, the second end of the second switch is connected to the first end of the first resistor, and the second end of the first resistor is connected to the second end of the first switch.

[0013] Optionally, the control end of the first switch and the control end of the second switch are both connected to the control end of the control circuit, and the control circuit is configured to first control the second switch to close and the first switch to open for a set time, and then control the first switch to close and the second switch to open.

[0014] Optionally, the filter circuit includes a first inductor and a first capacitor, the connection point of the first end of the first inductor and the first end of the first capacitor serves as the first end of the filter circuit, and the second end of the first inductor and the second end of the first capacitor are respectively connected to different phases of the first end of the rectifier circuit.

[0015] Optionally, the first inductor is reused as a filter inductor of the rectifier circuit.

[0016] Optionally, an overcurrent protection device is provided between the switch circuit and the power grid.

[0017] Optionally, a current sampling terminal of the control circuit is connected to the second terminal of the first inductor, and the control circuit is further configured to control the conversion efficiency of the rectifier circuit according to a second feedback signal of the current sampling terminal.

[0018] According to a second aspect of the present invention, a power supply control system is provided, the system comprising a plurality of the power supply control circuits, the power supply control circuit being the power supply control circuit described in the first aspect, and the plurality of the power supply control circuits being connected in parallel.

[0019] According to one embodiment of the present disclosure, the power supply control circuit provided by the utility model can control the conduction of the switch circuit so that the first alternating current output by the power grid can be processed by the filter circuit and the rectifier circuit, and the positive terminal, negative terminal and ground terminal of the rectifier circuit can output positive voltage and negative voltage to the load, so that the load can obtain direct current with a wider voltage value to meet the needs of different loads, so as to improve the performance of the power supply control circuit.

[0020] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0022] Figure 1 is a structural block diagram of a power supply control circuit according to an embodiment;

[0023] Figure 2 is a circuit diagram of a power supply control system according to an embodiment.

[0024] Description of the drawings:

[0025] Power supply control circuit 1000; switch circuit 100; filter circuit 200; rectifier circuit 300; control circuit 400;

[0026] Grid: 2000; load: 3000. DETAILED DESCRIPTION

[0027] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0028] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0029] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0030] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0031] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0032] See also Figure 1 As shown, the power supply control circuit 1000 according to the embodiment of the present disclosure is described.

[0033] The power supply control circuit 1000 of the embodiment of the present disclosure includes a switch circuit 100, a filter circuit 200, a rectifier circuit 300 and a control circuit. The first end of the switch circuit 100 is used to connect to the power grid 2000; the first end of the filter circuit 200 is connected to the first end of the switch circuit 100; the input end of the rectifier circuit 300 is connected to the second end of the filter circuit 200, and the positive end (DC+ end), the negative end (DC- end) and the ground end (OV1 end) of the rectifier circuit 300 are respectively used to connect to the load 3000; and the control end of the control circuit is respectively connected to the control end of the switch circuit 100 and the control end of the rectifier circuit 300, and the control circuit is configured to respond to the first alternating current output by the power grid 2000, control the switch circuit 100 to turn on, and then output a control signal to the rectifier circuit 300, so that the rectifier circuit 300 converts the first alternating current into the first direct current.

[0034] In this embodiment, the power grid 2000 outputs three-phase alternating current with a certain voltage value, for example, 380V.

[0035] In this embodiment, the rectifier circuit 300 may be an AC-DC conversion circuit, which may convert the first AC power into the first DC power with a wider voltage range.

[0036] In this embodiment, the control circuit may be a control chip, which may output PWM wave signals with different duty cycles to the rectifier circuit 300 to control the conversion efficiency of the rectifier circuit 300. This control method is a prior art and will not be elaborated in detail here.

[0037] In other words, the control circuit of the power supply control circuit 1000 can control the switching circuit 100 to be turned on, so that the first alternating current output by the power grid 2000 can be processed by the filter circuit 200 and the rectifier circuit 300, and the positive terminal, negative terminal and ground terminal of the rectifier circuit 300 can output positive voltage and negative voltage to the load 3000, so that the load 3000 can obtain direct current with a wider voltage value to meet the needs of different loads 3000, so as to improve the performance of the power supply control circuit 1000.

[0038] In some embodiments, Figure 2As shown, the rectifier circuit 300 can be a Vienna rectifier circuit 300, and the rectifier circuit 300 can be composed of a first inductor L1, a rectifier bridge T1, switch tubes Q1 to Q6, a capacitor C1 and a capacitor C2. The Vienna rectifier circuit 300 is an existing rectifier circuit 300, and the specific working process and AC-DC conversion control method are all prior art, which will not be elaborated in detail here. Among them, the switch tubes Q1 to Q6 are all MOS tubes. In other words, the rectifier circuit 300 can achieve high power density and high-efficiency DC output through MOS tubes, which is more convenient to assemble and has a smaller module size. Multiple groups of MOS tubes are connected in parallel to replace the insulated gate bipolar transistor (IGBT) as a controllable switch tube, with high switching frequency, low loss and few harmonics.

[0039] In some embodiments, in order to improve the accuracy of the voltage value of the output first direct current, the first voltage sampling terminal of the control circuit is connected to the power grid 2000, and the second voltage sampling terminal of the control circuit is connected to the load 3000. The control circuit is configured to control the conversion efficiency of the rectifier circuit 300 based on the first feedback signal of the first voltage sampling terminal and the second voltage sampling terminal.

[0040] In some embodiments, Figure 2 As shown, the switch circuit 100 includes a first switch K1, a second switch K2 and a first resistor R1, the first end of the first switch K1 serves as the first end of the switch circuit 100, the second end of the first switch K1 serves as the second end of the switch circuit 100, the first end of the second switch K2 is connected to the first end of the first switch K1, the second end of the second switch K2 is connected to the first end of the first resistor R1, and the second end of the first resistor R1 is connected to the second end of the first switch K1. In other words, when the power grid 2000 supplies power to the load 3000, the second switch K2 is closed and the first switch K1 is disconnected for a set time, and then the first switch K1 is closed and the second switch K2 is disconnected to form a pre-charging circuit to improve the stability of the DC power output to the load 3000.

[0041] In some embodiments, Figure 2 As shown, the control end of the first switch K1 and the control end of the second switch K2 are both connected to the control end of the control circuit, and the control circuit is configured to first control the second switch K2 to close and the first switch K1 to open for a set time, and then control the first switch K1 to close and the second switch K2 to open. The set time is manually set and is not limited here. In other words, by controlling the first switch and the second switch through the control circuit, the integration of the power supply control circuit 1000 can be effectively improved.

[0042] In some embodiments, the filter circuit 200 includes a first inductor and a first capacitor, the connection point of the first end of the first inductor and the first end of the first capacitor is used as the first end of the filter circuit 200, and the second end of the first inductor and the second end of the first capacitor are respectively connected to different phases of the first end of the rectifier circuit 300. In other words, by setting the filter circuit 200, the stability of the first direct current output to the load 3000 can be effectively improved.

[0043] In some embodiments, the first inductor is reused as a filter inductor of the rectifier circuit 300. By reusing the filter inductor, the manufacturing cost of the power supply control circuit 1000 can be effectively reduced.

[0044] In some embodiments, in order to protect the components in the power supply control circuit 1000, such as Figure 2 As shown, an overcurrent protection device is provided between the switch circuit 100 and the power grid 2000. The overcurrent protection device is, for example, a fuse F1, which is connected between the switch Q0 and the first end of the first switch.

[0045] In some embodiments, in order to further improve the accuracy of the voltage value of the output first direct current, the current sampling end of the control circuit is connected to the second end of the first inductor, and the control circuit is also configured to control the conversion efficiency of the rectifier circuit 300 according to the second feedback signal of the current sampling end.

[0046] According to the power supply control system provided by the embodiment of the present disclosure, Figure 2 As shown, the power supply control system includes a plurality of power supply control circuits 1000, namely, power supply control circuit 1000a, power supply control circuit 1000b, power supply control circuit 1000c and power supply control circuit 1000d, wherein the power supply control circuit 1000 is the power supply control circuit 1000 in any of the above embodiments, and the plurality of power supply control circuits 1000 are connected in parallel. In other words, the power supply control system is configured with a plurality of power supply control circuits 1000 to provide power resources with a wider current value range.

[0047] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A power supply control circuit, characterized in that: include: A switch circuit, wherein a first end of the switch circuit is used to connect to a power grid; A filter circuit, a first end of the filter circuit being connected to a first end of the switch circuit; A rectifier circuit, wherein an input end of the rectifier circuit is connected to the second end of the filter circuit, and a positive terminal, a negative terminal and a ground terminal of the rectifier circuit are respectively used to connect to a load; as well as A control circuit, wherein the control end of the control circuit is respectively connected to the control end of the switch circuit and the control end of the rectifier circuit, and the control circuit is configured to respond to the first alternating current output by the power grid, control the switching circuit to be turned on, and then output a control signal to the rectifier circuit, so that the rectifier circuit converts the first alternating current into a first direct current.

2. The power supply control circuit according to claim 1, characterized in that: The rectifier circuit is a Vienna rectifier circuit.

3. The power supply control circuit according to claim 1, characterized in that: The first voltage sampling terminal of the control circuit is connected to the power grid, the second voltage sampling terminal of the control circuit is connected to the load, and the control circuit is configured to control the conversion efficiency of the rectifier circuit according to first feedback signals of the first voltage sampling terminal and the second voltage sampling terminal.

4. The power supply control circuit according to claim 1, characterized in that: The switch circuit includes a first switch, a second switch and a first resistor, wherein the first end of the first switch serves as the first end of the switch circuit, the second end of the first switch serves as the second end of the switch circuit, the first end of the second switch is connected to the first end of the first switch, the second end of the second switch is connected to the first end of the first resistor, and the second end of the first resistor is connected to the second end of the first switch.

5. The power supply control circuit according to claim 4, characterized in that: The control end of the first switch and the control end of the second switch are both connected to the control end of the control circuit, and the control circuit is configured to first control the second switch to close and the first switch to open for a set time, and then control the first switch to close and the second switch to open.

6. The power supply control circuit according to any one of claims 1 to 5, characterized in that: The filter circuit includes a first inductor and a first capacitor, the connection point of the first end of the first inductor and the first end of the first capacitor serves as the first end of the filter circuit, and the second end of the first inductor and the second end of the first capacitor are respectively connected to different phases of the first end of the rectifier circuit of the rectifier circuit.

7. The power supply control circuit according to claim 6, characterized in that: The first inductor is reused as a filter inductor of the rectifier circuit.

8. The power supply control circuit according to claim 6, characterized in that: An overcurrent protection device is provided between the switch circuit and the power grid.

9. The power supply control circuit according to claim 6, characterized in that: The current sampling terminal of the control circuit is connected to the second terminal of the first inductor, and the control circuit is further configured to control the conversion efficiency of the rectifier circuit according to a second feedback signal from the current sampling terminal.

10. A power supply control system, characterized in that: It comprises a plurality of the power supply control circuits, wherein the power supply control circuit is the power supply control circuit according to any one of claims 1 to 9, and the plurality of the power supply control circuits are connected in parallel.

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