CN214256128U

CN214256128U - Capacitance adjusting circuit and power supply

Info

Publication number: CN214256128U
Application number: CN202023352279.XU
Authority: CN
Inventors: 方明照; 黄猛; 王京; 肖尊辉; 俞贤桥; 安宏迪
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2021-09-21
Anticipated expiration: 2030-12-31

Abstract

The utility model discloses an electric capacity regulating circuit and power, wherein, this electric capacity regulating circuit includes: a capacitance circuit for suppressing electromagnetic interference; the capacitance value of the capacitance circuit is adjustable; the detection circuit is connected with the capacitance circuit and is used for detecting the leakage current of the capacitance circuit; and the control circuit is connected with the detection circuit and the capacitor circuit and is used for adjusting the capacitance value of the capacitor circuit according to the leakage current so as to control the leakage current to be maintained at a preset value. The utility model provides an among the prior art electric capacity fix cause the inconvenient problem of dismouting in the circuit test process, can adjust the capacitance value in a flexible way, reduce the leakage current to guarantee the filtering effect of circuit.

Description

Capacitance adjusting circuit and power supply

Technical Field

The utility model relates to the technical field of circuits, particularly, relate to a capacitance regulating circuit and power.

Background

The power filter leakage current is defined as the current from the filter housing to either end of the ac inlet line at the rated ac voltage. If all ports of the filter are completely insulated from the housing, the value of the leakage current depends mainly on the leakage current of the common-mode capacitance CY, i.e. mainly on the capacity of CY. The magnitude of the leakage current of the filter relates to personal safety, and international countries have strict standard regulations on the leakage current of the filter: for a 220V/50Hz AC mains supply, a noise filter leakage current of less than 1mA is typically required. The Y electric capacity is big more, and the leakage current is then big more, but the Y electric capacity is too little, can cause the filtering ability not enough, at actual test electromagnetic compatibility (EMC)'s in-process, often need dismantle and weld Y electric capacity, come the rectification and change the waveform, the dismouting process is very troublesome and consuming time, extremely inconvenient, even causes the harm to the PCB board easily at the unsolder in-process.

Aiming at the problem of inconvenient disassembly and assembly in the circuit testing process caused by the fixed capacitor in the related technology, an effective solution is not provided at present.

SUMMERY OF THE UTILITY MODEL

The utility model provides a capacitance regulating circuit and power to solve the fixed inconvenient problem of dismouting in the circuit test process that causes of electric capacity among the prior art at least.

In order to solve the above technical problem, according to the utility model discloses an aspect of the embodiment provides a capacitance adjusting circuit, include: a capacitance circuit for suppressing electromagnetic interference; the capacitance value of the capacitance circuit is adjustable; the detection circuit is connected with the capacitance circuit and is used for detecting the leakage current of the capacitance circuit; and the control circuit is connected with the detection circuit and the capacitor circuit and is used for adjusting the capacitance value of the capacitor circuit according to the leakage current so as to control the leakage current to be maintained at a preset value.

Further, still include: an AC power line and a ground line; one end of the capacitor circuit is connected with the alternating current power line, and the other end of the capacitor circuit is connected with the detection circuit; one end of the detection circuit is connected with the capacitor circuit, and the other end of the detection circuit is connected with the ground wire.

Further, the capacitance circuit includes: a parallel capacitor bank including at least two capacitors connected in parallel; the parallel switch group comprises switches which are arranged in one-to-one correspondence with the capacitors connected in parallel, is positioned between the capacitors connected in parallel and the alternating current power line and is used for controlling the on-off of the capacitors connected in parallel; wherein, the control circuit is connected with the parallel switch group.

Further, the capacitance circuit further includes: a series capacitor bank including one capacitor or a plurality of capacitors connected in series, one end of the series capacitor bank being connected to the parallel connection point and the other end thereof being connected to the detection circuit; the parallel connection point is a point between any one capacitor in the parallel capacitor bank and the detection circuit; a series switch bank comprising: a first switch located between the series capacitor bank and the parallel connection point; the second switch is positioned between the series capacitor bank and the detection circuit; and the series switch is positioned between every two capacitors connected in series.

According to another aspect of the embodiments of the present invention, there is provided a power supply, a filter of which includes the capacitance adjusting circuit as described above.

The utility model discloses in, provide a circuit of electric capacity self-adaptation regulation and control method thereof, by the capacitor circuit, detection circuitry, control circuit makes up and forms, because the appearance value of capacitor circuit is adjustable, judge whether adjust the capacitance value size through detecting leakage current, when needs are adjusted, change electric capacity appearance value size through the quantity of the electric capacity of adjusting electric capacity series-parallel connection, reach appearance value self-adaptation's purpose, not only can adjust the capacitance value in a flexible way, avoided the fixed inconvenient problem of dismouting in the circuit test process that causes of electric capacity, can also reduce the leakage current, and guarantee the filtering effect of circuit.

Drawings

Fig. 1 is an alternative circuit diagram of a capacitance adjusting circuit according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.

Example 1

The utility model discloses provide a capacitance adjusting circuit in preferred embodiment 1, mainly be applied to the wave filter of power for realize power filter's leakage current and adjust. Specifically, fig. 1 shows an alternative structural schematic diagram of the circuit, and as shown in fig. 1, the circuit includes:

a capacitance circuit for suppressing electromagnetic interference; the capacitance value of the capacitance circuit is adjustable;

the detection circuit is connected with the capacitance circuit and is used for detecting the leakage current of the capacitance circuit;

and the control circuit is connected with the detection circuit and the capacitor circuit and is used for adjusting the capacitance value of the capacitor circuit according to the leakage current so as to control the leakage current to be maintained at a preset value.

In the above embodiment, a circuit for adaptive adjustment of capacitance is provided, which is formed by combining a capacitance circuit, a detection circuit and a control circuit, wherein the capacitance value of the capacitance circuit is adjustable, and whether the capacitance value is adjusted is determined by detecting leakage current.

As shown in fig. 1, the circuit further includes an ac power line and a ground line; the alternating current power line is connected with an alternating current power supply of the filter circuit, and the ground wire is connected with the ground of the filter circuit. As shown in the figure, one end of the capacitor circuit is connected with an alternating current power line, and the other end of the capacitor circuit is connected with the detection circuit; one end of the detection circuit is connected with the capacitor circuit, and the other end of the detection circuit is connected with the ground wire.

The capacitor circuit comprises two parts, wherein the first part is a parallel capacitor bank, as shown in fig. 1, the parallel capacitor bank comprises at least two capacitors connected in parallel, including C1, C2 and C3 … Cn in fig. 1; the parallel switch group comprises switches which are arranged in one-to-one correspondence with the capacitors connected in parallel, are positioned between the capacitors connected in parallel and the alternating current power line and are used for controlling the on-off of the capacitors connected in parallel, and comprises S1, S2 and S3 … Sn in the figure 1; wherein, the control circuit is connected with the parallel switch group.

The second part is a series capacitor bank, as shown in fig. 1, comprising one capacitor or a plurality of capacitors connected in series, one end of which is connected with the parallel connection point and the other end of which is connected with the detection circuit; the parallel connection point is a point between any one capacitor in the parallel capacitor bank and the detection circuit; a series switch bank comprising: a first switch S5 between the series capacitor bank and the parallel connection point; the second switch Sn is positioned between the series capacitor bank and the detection circuit; series switches, located between every two capacitors connected in series, include S6, S7, etc. in fig. 1.

The circuit can automatically adjust the capacitance value after detecting the capacitance value of the capacitor, can change the capacitance value without disassembling and assembling the capacitor, and is convenient for engineering use. In addition, this circuit also can make the frock, with its string income filtering board, can confirm the electric capacity scheme fast.

Example 2

In a preferred embodiment 2 of the present invention, there is provided a power supply, wherein a filter of the power supply includes the capacitance adjusting circuit as described above.

Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A capacitance adjustment circuit, comprising:

2. The capacitance adjustment circuit of claim 1, further comprising:

an AC power line and a ground line; one end of the capacitor circuit is connected with the alternating current power line, and the other end of the capacitor circuit is connected with the detection circuit; one end of the detection circuit is connected with the capacitor circuit, and the other end of the detection circuit is connected with the ground wire.

3. The capacitance adjustment circuit of claim 2, wherein the capacitance circuit comprises:

a parallel capacitor bank including at least two capacitors connected in parallel;

the parallel switch group comprises switches which are arranged in one-to-one correspondence with the capacitors connected in parallel, is positioned between the capacitors connected in parallel and the alternating current power line and is used for controlling the on-off of the capacitors connected in parallel;

wherein the control circuit is connected with the parallel switch group.

4. The capacitance adjustment circuit of claim 3, further comprising:

a series capacitor bank including one capacitor or a plurality of capacitors connected in series, one end of the series capacitor bank being connected to the parallel connection point and the other end thereof being connected to the detection circuit; the parallel connection point is a point between any one capacitor in the parallel capacitor group and the detection circuit;

a series switch bank comprising:

a first switch located between the series capacitor bank and the parallel connection point;

a second switch between the series capacitor bank and the detection circuit;

and the series switch is positioned between every two capacitors connected in series.

5. A power supply, characterized in that a filter of the power supply comprises a capacitance adjusting circuit according to any one of claims 1-4.