A high-voltage isolated DC power supply module

Abstract

The utility model discloses a high -voltage isolation type DC power module, including input filter module, high -voltage isolation conversion module, rectifier filter module and voltage stabilizing control module, the output of input filter module is connected with the input circuit of high -voltage isolation conversion module through the wire, the utility model discloses, through the electrical isolation of isolation transformer primary and secondary winding, realize the high -voltage isolation of input side and output side, effectively avoid electrical interference and security risk, and the closed -loop control of voltage stabilizing control module and voltage feedback module is combined simultaneously, can when input voltage fluctuation or load change, will output voltage stabilize in the preset range, and the voltage stabilizing precision is superior to the existing common module, in addition, input filter and rectifier filter all adopt LC filter circuit, and the input ripple and output ripple are reduced greatly, improve the output quality of power module, satisfy the power supply demand of high -precision load.

Description

Technical Field

[0001] This utility model relates to the field of power electronics technology, and in particular to a high-voltage isolated DC power supply module. Background Technology

[0002] In fields such as power electronic equipment, industrial control, and communication systems, it is often necessary to convert input DC voltage into isolated output DC voltage, and the output voltage must be stable and have overcurrent protection.

[0003] Traditional DC power modules have insufficient high-voltage isolation performance, large electrical interference on the input and output sides, which can easily lead to equipment failure. They also have low voltage regulation accuracy, poor output voltage stability and poor filtering effect when the input voltage fluctuates or the load changes, resulting in large output ripple and affecting the working stability of the load equipment. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies that "only use a single vibration or rotational motion to achieve screening, which makes it difficult to meet the dual requirements of material anti-clogging and efficient sorting, especially when dealing with edible fungi with debris attached to their roots, which can easily cause equipment shutdown for cleaning due to screen hole blockage, affecting production continuity." Therefore, a high-voltage isolated DC power supply module is proposed.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A high-voltage isolated DC power supply module includes: an input filtering module, a high-voltage isolation conversion module, a rectifier filtering module, and a voltage regulation control module; The output of the input filtering module is connected to the input circuit of the high-voltage isolation converter module via a wire. The high-voltage isolation converter module adopts a resonant inverter circuit with an isolation transformer, and its output terminal is connected to the input terminal circuit of the rectifier and filter module through a wire. The rectifier and filter module adopts an LC filter circuit composed of inductor u2, capacitor C1 and C2, and its output terminal serves as the total output terminal of the power supply module. The high-voltage isolation conversion module achieves high-voltage isolation between the input and output sides through electrical isolation between the primary and secondary windings of the isolation transformer.

[0006] As a preferred embodiment of the high-voltage isolated DC power supply module of this utility model, the voltage regulation control module adopts a control circuit with UC3637 chip as the core. Its voltage sampling terminal is connected to the output terminal circuit of the rectifier and filter module through a wire, and its PWM drive signal output terminal is connected to the switching transistor drive terminal circuit of the resonant inverter circuit in the high-voltage isolated converter module through a wire, so as to adjust the duty cycle of the switching transistor to achieve output voltage stability.

[0007] As a preferred embodiment of the high-voltage isolated DC power supply module of this utility model, it further includes a voltage feedback module. The voltage feedback module adopts a feedback circuit composed of an operational amplifier, resistors and capacitors. Its signal input terminal is connected to the output terminal circuit of the rectifier and filter module through a wire, and its signal output terminal is connected to the feedback input terminal circuit of the voltage regulation control module through a wire, so as to realize closed-loop feedback control of the output voltage.

[0008] As a preferred embodiment of the high-voltage isolated DC power supply module of this utility model, it further includes an overcurrent protection module. The overcurrent protection module adopts a circuit composed of a sampling circuit, a comparator and a protection element. Its current sampling terminal is connected to the current path circuit of the high-voltage isolation converter module through a wire, and its protection trigger terminal is connected to the overcurrent protection input terminal circuit of the voltage regulation control module through a wire. It is used to cut off the working power supply of the high-voltage isolation converter module to achieve protection when there is an overcurrent.

[0009] In a preferred embodiment of the high-voltage isolated DC power supply module of this utility model, the circuit structures of the input filter module and the rectifier filter module are both LC filter circuits. The input terminal of the input filter module is used to connect to an external DC power supply, and the output terminal is connected to the input terminal circuit of the high-voltage isolation converter module through a wire to filter out ripple interference in the input power supply.

[0010] As a preferred embodiment of the high-voltage isolated DC power supply module of this utility model, the resonant inverter circuit is a single-tube flyback inverter circuit, which consists of a switching transistor, the primary windings L1 and L2 of the isolation transformer T, and the secondary winding L3. The driving end of the switching transistor is connected to the PWM output circuit of the voltage regulation control module through a wire, and the output end of the secondary winding L3 is connected to the input circuit of the rectifier and filter module through a wire. The isolation transformer realizes the isolation conversion and transmission of energy.

[0011] Compared with the prior art, the beneficial effects of this utility model are: Electrical isolation between the primary and secondary windings of the isolation transformer is achieved, effectively preventing electrical interference and safety hazards. Combined with the closed-loop control of the voltage regulation control module and the voltage feedback module, the output voltage can be stabilized within a preset range when the input voltage fluctuates or the load changes. The voltage regulation accuracy is better than that of existing conventional modules. In addition, both the input filter and the rectification filter adopt LC filter circuits, which greatly reduces the input ripple and output ripple, improves the output quality of the power supply module, and meets the power supply requirements of high-precision loads. Attached Figure Description

[0012] Figure 1 The present invention provides a filter circuit diagram for a high-voltage isolated DC power supply module. Figure 2 This invention provides a control circuit diagram for a high-voltage isolated DC power supply module. Figure 3 A voltage feedback circuit diagram for a high-voltage isolated DC power supply module proposed in this utility model; Figure 4 This utility model presents an overcurrent protection circuit diagram for a high-voltage isolated DC power supply module. Figure 5 The present invention provides a resonant inverter circuit diagram for a high-voltage isolated DC power supply module. Detailed Implementation

[0013] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0014] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0015] Reference Figures 1-5 A high-voltage isolated DC power supply module includes an input filtering module, a high-voltage isolation conversion module, a rectifier filtering module, a voltage regulation control module, a voltage feedback module, and an overcurrent protection module.

[0016] The output of the input filter module is connected to the input circuit of the high-voltage isolation converter module via a wire. The high-voltage isolation converter module adopts a resonant inverter circuit with an isolation transformer. Its output is connected to the input circuit of the rectifier filter module via a wire. The rectifier filter module adopts an LC filter circuit composed of inductor u2, capacitor C1 and C2. Its output serves as the total output of the power supply module. The high-voltage isolation converter module achieves high-voltage isolation between the input and output sides through the electrical isolation of the primary and secondary windings of the isolation transformer.

[0017] Furthermore, the voltage regulation control module adopts a control circuit based on the UC3637 chip. Its voltage sampling terminal is connected to the output circuit of the rectifier and filter module through a wire, and its PWM drive signal output terminal is connected to the switching transistor drive circuit of the resonant inverter circuit in the high-voltage isolation converter module through a wire. This allows for adjustment of the switching transistor's duty cycle to stabilize the output voltage. The voltage sampling terminal acquires the output voltage of the rectifier and filter module, compares it with the internal reference voltage to generate an error signal, and then adjusts the duty cycle of the PWM drive signal to control the on-time of the switching transistor in the high-voltage isolation converter module, ultimately achieving output voltage stability.

[0018] The voltage feedback module uses a feedback circuit composed of an operational amplifier, resistors, and capacitors. Its signal input terminal is connected to the output terminal circuit of the rectifier and filter module through a wire, and its signal output terminal is connected to the feedback input terminal circuit of the voltage regulation control module through a wire, thereby realizing closed-loop feedback control of the output voltage.

[0019] The overcurrent protection module employs a circuit consisting of a sampling circuit, a comparator, and protective elements. Its current sampling terminal is connected to the current path circuit of the high-voltage isolation converter module via a wire, and its protection trigger terminal is connected to the overcurrent protection input circuit of the voltage regulation control module via a wire. This is used to cut off the power supply to the high-voltage isolation converter module during overcurrent to achieve protection. The sampled voltage is input to the comparator and compared with a reference voltage. When the current exceeds a preset threshold, the comparator outputs a trigger signal, which cuts off the power supply to the high-voltage isolation converter module through the voltage regulation control module, thus achieving overcurrent protection.

[0020] Both the input filter module and the rectifier filter module have LC filter circuits. The input terminal of the input filter module is used to connect to an external DC power supply, and the output terminal is connected to the input terminal circuit of the high-voltage isolation converter module through a wire to filter out ripple interference in the input power supply.

[0021] The resonant inverter circuit is a single-transistor flyback inverter circuit, consisting of a switching transistor, the primary windings L1 and L2 of the isolation transformer T, and the secondary winding L3. The driving terminal of the switching transistor is connected to the PWM output circuit of the voltage regulation control module via a wire, and the output terminal of the secondary winding L3 is connected to the input circuit of the rectifier and filter module via a wire. Energy isolation, conversion, and transmission are achieved through the isolation transformer. Both the input filter module and the rectifier and filter module employ... Figure 1 The LC filter circuit shown uses the inductor and capacitor of the input filter module to filter the input DC power supply, removing ripple and interference signals, and outputting a stable DC voltage to the high-voltage isolation converter module. The rectifier filter module rectifies the high-frequency pulse voltage output by the high-voltage isolation converter module, and then filters it through the LC filter circuit composed of inductor u2 and capacitors C1 and C2, finally outputting a stable DC voltage.

[0022] It is worth noting that the entire device is controlled by a controller. Since the controller is a common device and belongs to existing mature technology, its electrical connection relationship and specific circuit structure will not be described in detail here.

[0023] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the protection scope of this utility model. In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," or "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

Claims

1. A high-voltage isolated DC power supply module, comprising: The input filtering module, high-voltage isolation converter module, rectifier filtering module, and voltage regulation control module are characterized by: The output of the input filtering module is connected to the input circuit of the high-voltage isolation converter module via a wire. The high-voltage isolation converter module adopts a resonant inverter circuit with an isolation transformer, and its output terminal is connected to the input terminal circuit of the rectifier and filter module through a wire. The rectifier and filter module adopts an LC filter circuit composed of inductor u2, capacitor C1 and C2, and its output terminal serves as the total output terminal of the power supply module. The high-voltage isolation conversion module achieves high-voltage isolation between the input and output sides through electrical isolation between the primary and secondary windings of the isolation transformer.

2. The high-voltage isolated DC power supply module according to claim 1, characterized in that: The voltage regulation control module adopts a control circuit based on the UC3637 chip. Its voltage sampling terminal is connected to the output circuit of the rectifier and filter module through a wire, and its PWM drive signal output terminal is connected to the switching transistor drive circuit of the resonant inverter circuit in the high-voltage isolation converter module through a wire, so as to adjust the duty cycle of the switching transistor to achieve output voltage stability.

3. The high-voltage isolated DC power supply module according to claim 1, characterized in that: It also includes a voltage feedback module, which adopts a feedback circuit composed of an operational amplifier, resistors and capacitors. Its signal input terminal is connected to the output terminal circuit of the rectifier and filter module through a wire, and its signal output terminal is connected to the feedback input terminal circuit of the voltage regulation control module through a wire, so as to realize closed-loop feedback control of the output voltage.

4. The high-voltage isolated DC power supply module according to claim 1, characterized in that: It also includes an overcurrent protection module, which is a circuit composed of a sampling circuit, a comparator and a protection element. Its current sampling terminal is connected to the current path circuit of the high-voltage isolation conversion module through a wire, and its protection trigger terminal is connected to the overcurrent protection input terminal circuit of the voltage regulation control module through a wire. It is used to cut off the working power supply of the high-voltage isolation conversion module to achieve protection when there is an overcurrent.

5. The high-voltage isolated DC power supply module according to claim 1, characterized in that: Both the input filtering module and the rectifier filtering module have LC filter circuits. The input terminal of the input filtering module is used to connect to an external DC power supply, and the output terminal is connected to the input terminal circuit of the high-voltage isolation converter module through a wire to filter out ripple interference in the input power supply.

6. The high-voltage isolated DC power supply module according to claim 1, characterized in that: The resonant inverter circuit is a single-transistor flyback inverter circuit, consisting of a switching transistor, primary windings L1 and L2 of the isolation transformer T, and secondary winding L3. The driving end of the switching transistor is connected to the PWM output circuit of the voltage regulation control module through a wire, and the output end of the secondary winding L3 is connected to the input circuit of the rectifier and filter module through a wire. The isolation transformer realizes the isolation conversion and transmission of energy.

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