EMC filter circuit for 220V DC motor chopping power regulation

Abstract

The utility model discloses a kind of EMC filter circuit of 220V DC motor chopper power regulating, including alternating current circuit and direct current circuit, rectifier bridge stack is equipped between alternating current circuit and direct current circuit;Direct current motor is equipped on direct current circuit, the positive pole of direct current motor is connected with the output end positive pole of rectifier bridge stack, the negative pole of direct current motor is connected with the output end negative pole of rectifier bridge stack, and the motor shell of direct current motor is connected ground wire;Alternating current circuit includes first X capacitor, first Y capacitor, second Y capacitor and second X capacitor, first X capacitor connects alternating current live wire and alternating current zero line, first Y capacitor and second Y capacitor are connected in parallel, second X capacitor is connected in parallel with first Y capacitor and second Y capacitor, first Y capacitor, second Y capacitor and second X capacitor are all connected the input end of rectifier bridge stack, and ground wire is connected between first Y capacitor and second Y capacitor.This utility model can solve the technical problem that motor is jittered or not smoothly rotated.

Description

Technical Field

[0001] This utility model relates to the field of DC motor chopper power regulation technology, and in particular to an EMC filter circuit for 220V DC motor chopper power regulation. Background Technology

[0002] When using chopper modulation for existing 220V DC motors, a Y capacitor is typically added to the motor. Chopper modulation results in significant interference, which often travels through the ground wire during chopping. To address the EMC (conducted compatibility) issue, it's difficult to pass through this interference. Currently, the industry standard is to use a drop-out method for motor power adjustment or soft starting. While this achieves EMC compliance, it can cause motor vibration or uneven rotation.

[0003] Therefore, it is urgent to research and develop an EMC filter circuit for 220V DC motor chopper power regulation to solve the technical problems of motor vibration or uneven rotation. Summary of the Invention

[0004] The purpose of this utility model is to provide an EMC filter circuit for chopper power regulation of a 220V DC motor, which can solve the technical problems of motor vibration or uneven rotation.

[0005] To achieve the above objectives, this utility model provides a 220V DC motor chopper power regulation method.

[0006] The specific implementation scheme for the EMC filter circuit is as follows:

[0007] An EMC filter circuit for chopper power regulation of a 220V DC motor includes an AC circuit and a DC circuit. A rectifier bridge is provided between the AC circuit and the DC circuit. The rectifier bridge converts the AC power of the AC circuit into DC power and provides it to the DC circuit.

[0008] The DC circuit includes a DC motor, the positive terminal of which is connected to the positive output terminal of the rectifier bridge, the negative terminal of which is connected to the negative output terminal of the rectifier bridge, and the motor housing of which is connected to ground.

[0009] The AC circuit includes a first X capacitor, a first Y capacitor, a second Y capacitor, and a second X capacitor. The first X capacitor is connected to the AC live wire and the AC neutral wire. The first Y capacitor and the second Y capacitor are connected in parallel. The second X capacitor is connected in parallel with the first Y capacitor and the second Y capacitor. The first Y capacitor, the second Y capacitor, and the second X capacitor are all connected to the input terminal of the rectifier bridge, and a ground wire is connected between the first Y capacitor and the second Y capacitor.

[0010] In some embodiments, the AC circuit further includes a common-mode inductor, the input terminal of which is connected to the first X capacitor, and the output terminal of which is connected to the first Y capacitor, the second Y capacitor, and the second X capacitor.

[0011] By employing a common-mode inductor, common-mode interference in AC circuits can be suppressed, signal quality improved, and EMC optimized.

[0012] In some embodiments, a first discharge resistor and a second discharge resistor are provided on the AC circuit, the first discharge resistor and the second discharge resistor are connected in series, and the first discharge resistor and the second discharge resistor are connected in parallel with the first X capacitor.

[0013] By using a first discharge resistor and a second discharge resistor to control the voltage of each capacitor in the AC circuit

[0014] The discharge speed of the voltage protects the AC circuit and its components.

[0015] In some embodiments, a varistor and a varistor are provided on the AC circuit, the varistor is connected in series with the first X capacitor, the varistor is connected in series with the varistor, and the varistor is connected in parallel with the first X capacitor.

[0016] By setting varistors and varistors on AC circuits, overvoltage protection, overcurrent protection, and lightning protection for AC circuits can be achieved.

[0017] In some embodiments, the pressure-sensitive element is a fuse.

[0018] By using a fuse as a varistor, the normal operation of the varistor is ensured.

[0019] In some embodiments, either end of the second X capacitor is connected to the input of the rectifier bridge via a bidirectional thyristor.

[0020] By using bidirectional thyristors connected to the rectifier bridge, the system can control the bidirectional flow of current in the AC circuit, regulate voltage and current, and protect the circuit.

[0021] Based on the above technical solution, this utility model has the following beneficial effects compared with the prior art:

[0022] By moving the first and second Y capacitors, originally located on the DC motor, into the AC circuit, the spark interference generated by the carbon brushes and commutator inside the DC motor first passes through the rectifier bridge and then enters the second X capacitor in the DC circuit for filtering before entering the ground wire. This prevents the interference from directly exiting from the Y capacitor inside the DC motor, greatly reducing the interference from the DC motor and avoiding interference with other equipment. Attached Figure Description

[0023] Figure 1 This is a circuit diagram of the present invention.

[0024] Explanation of reference numerals in the attached figures:

[0025] 100, DC circuit; 110, DC motor; 200, AC circuit; DP1, rectifier bridge; PE, ground wire; ACL, live wire; ACN, neutral wire; T1, common mode inductor; CX1, first X capacitor; CX2, second X capacitor; CY1, first Y capacitor; CY2, second Y capacitor; F1, varistor; RV1, varistor resistor; R1, first discharge resistor; R2, second discharge resistor; QR1, bidirectional thyristor. Detailed Implementation

[0026] To facilitate understanding of this utility model, the specific embodiments of this utility model will be described in more detail below with reference to the accompanying drawings.

[0027] Unless otherwise specified or defined, the terms "first," "second," etc., used in this document are for distinguishing names only and do not represent a specific number or order.

[0028] Unless otherwise stated or defined, the term “and / or” as used herein includes any and all combinations of one or more of the related listed items.

[0029] It should be noted that in this article, "fixed to" or "connected to" can mean directly fixed to or connected to a component, or indirectly fixed to or connected to a component.

[0030] like Figure 1 As shown, the EMC filter circuit for chopping and regulating the power of a 220V DC motor 110 provided in this embodiment includes an AC circuit 200 and a DC circuit 100. A rectifier bridge DP1 is provided between the AC circuit 200 and the DC circuit 100. The rectifier bridge DP1 converts the AC power of the AC circuit 200 into DC power and provides it to the DC circuit 100.

[0031] The DC circuit 100 is equipped with a DC motor 110, and the positive terminal of the DC motor 110 is...

[0032] The negative terminal of the output of the flow bridge stack DP1 is connected, and the motor housing of the DC motor 110 is connected to the ground wire PE;

[0033] The AC circuit 200 includes a first X capacitor CX1, a first Y capacitor CY1, a second Y capacitor CY2, and a second X capacitor CX2. The first X capacitor CX1 is connected to the AC live wire ACL and the AC neutral wire ACN. The first Y capacitor CY1 and the second Y capacitor CY2 are connected in parallel. The second X capacitor CX2 is connected in parallel with the first Y capacitor CY1 and the second Y capacitor CY2. The first Y capacitor CY1, the second Y capacitor CY2, and the second X capacitor CX2 are all connected to the input terminal of the rectifier bridge DP1, and a ground wire PE is connected between the first Y capacitor CY1 and the second Y capacitor CY2.

[0034] In some embodiments, the AC circuit 200 further includes a common-mode inductor T1, the input terminal of which is connected to the first X capacitor CX1, and the output terminal of which is connected to the first Y capacitor CY1, the second Y capacitor CY2, and the second X capacitor CX2.

[0035] By employing a common-mode inductor T1, common-mode interference in the AC circuit 200 is suppressed, signal quality is improved, and EMC is optimized.

[0036] In some embodiments, a first discharge resistor R1 and a second discharge resistor R2 are provided on the AC circuit 200. The first discharge resistor R1 and the second discharge resistor R2 are connected in series, and the first discharge resistor R1 and the second discharge resistor R2 are connected in parallel with the first X capacitor CX1.

[0037] By using a first discharge resistor R1 and a second discharge resistor R2 to control the discharge rate of the voltage of each capacitor in the AC circuit 200, the AC circuit 200 and its components are protected.

[0038] In some embodiments, a varistor F1 and a varistor RV1 are provided on the AC circuit 200. The varistor F1 is connected in series with the first X capacitor CX1, the varistor RV1 is connected in series with the varistor F1, and the varistor RV1 is connected in parallel with the first X capacitor CX1.

[0039] By setting a varistor F1 and a varistor RV1 on the AC circuit 200, overvoltage protection, overcurrent protection and lightning protection of the AC circuit 200 can be achieved.

[0040] In some embodiments, the pressure-sensitive F1 is a fuse.

[0041] By using a fuse as the varistor F1, the normal operation of the varistor F1 is ensured.

[0042] In some embodiments, either end of the second X capacitor CX2 is connected to the input of the rectifier bridge DP1 via a bidirectional thyristor QR1.

[0043] By using a bidirectional thyristor QR1 connected to the rectifier bridge DP1, the bidirectional flow of current in the AC circuit 200 is controlled, the voltage and current are regulated, and the circuit is protected.

[0044] The EMC filtering circuit for chopper power regulation of a 220V DC motor 110 provided in this embodiment, compared with the prior art, by setting the first Y capacitor CY1 and the second Y capacitor CY2 originally set on the DC motor 110 into the AC circuit 200, the spark interference generated by the carbon brushes and commutator in the DC motor 110 first passes through the rectifier bridge DP1 and then enters the second X capacitor CX2 in the DC circuit 100 for filtering before entering the ground wire PE. It cannot directly exit from the Y capacitor inside the DC motor 110, greatly filtering out the interference that exits from the DC motor 110 and avoiding interference to other equipment.

[0045] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. An EMC filter circuit for chopper power regulation of a 220V DC motor, characterized in that, It includes an AC circuit and a DC circuit, with a rectifier bridge between the AC circuit and the DC circuit. The rectifier bridge converts the AC power from the AC circuit into DC power and supplies it to the DC circuit. The DC circuit includes a DC motor, the positive terminal of which is connected to the positive output terminal of the rectifier bridge, the negative terminal of which is connected to the negative output terminal of the rectifier bridge, and the motor housing of which is connected to ground. The AC circuit includes a first X capacitor, a first Y capacitor, a second Y capacitor, and a second X capacitor. The first X capacitor is connected to the AC live wire and the AC neutral wire. The first Y capacitor and the second Y capacitor are connected in parallel. The second X capacitor is connected in parallel with the first Y capacitor and the second Y capacitor. The first Y capacitor, the second Y capacitor, and the second X capacitor are all connected to the input terminal of the rectifier bridge, and a ground wire is connected between the first Y capacitor and the second Y capacitor.

2. The EMC filter circuit for 220V DC motor chopper power regulation as described in claim 1, characterized in that, The AC circuit also includes a common-mode inductor, the input terminal of which is connected to the first X capacitor, and the output terminal of which is connected to the first Y capacitor, the second Y capacitor, and the second X capacitor.

3. The EMC filter circuit for 220V DC motor chopper power regulation as described in claim 1 or 2, characterized in that, The AC circuit is provided with a first discharge resistor and a second discharge resistor, which are connected in series and connected in parallel with the first X capacitor.

4. The EMC filter circuit for 220V DC motor chopper power regulation as described in claim 1 or 2, characterized in that, The AC circuit is provided with a varistor and a varistor resistor. The varistor is connected in series with the first X capacitor, the varistor resistor is connected in series with the varistor, and the varistor resistor is connected in parallel with the first X capacitor. The pressure-sensitive element is a fuse.

5. The EMC filter circuit for 220V DC motor chopper power regulation as described in claim 1 or 2, characterized in that, Either end of the second X capacitor is connected to the input terminal of the rectifier bridge via a bidirectional thyristor.

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