CN212210868U

CN212210868U - Capacitor power-taking circuit

Info

Publication number: CN212210868U
Application number: CN202021300441.0U
Authority: CN
Inventors: 廖文超; 胡斌; 甘海涛
Original assignee: SHANGHAI GOODRUN ELECTRIC POWER TECHNOLOGY CO LTD
Current assignee: SHANGHAI GOODRUN ELECTRIC POWER TECHNOLOGY CO LTD
Priority date: 2020-07-06
Filing date: 2020-07-06
Publication date: 2020-12-22
Anticipated expiration: 2030-07-06

Abstract

The utility model provides an electric circuit is got to electric capacity, include: the circuit comprises a high-voltage arm capacitor 1, a high-voltage protection circuit 2, a power taking circuit 3, a low-voltage protection circuit 4 and a rectification filter circuit 5; one end of the high-voltage arm capacitor 1 is connected with a bus, and the other end of the high-voltage arm capacitor is connected with the high-voltage protection circuit 2; the input end of the electricity taking circuit 3 is connected with the other end of the high-voltage arm capacitor 1, and the output end of the electricity taking circuit 3 is connected with the rectifying and filtering circuit 5 through the low-voltage protection circuit 4. Through the utility model discloses a structural design can realize low pressure protection and high-pressure protection for the efficiency of getting in whole return circuit reaches more than 50%.

Description

Capacitor power-taking circuit

Technical Field

The utility model relates to a power supply, distribution field specifically, relate to an electric capacity is got electric circuit.

Background

Patent document CN203813534U discloses a high-voltage capacitor power-taking device, which includes a high-voltage capacitor power-taking unit connected to a power grid, wherein an output end of the high-voltage capacitor power-taking unit is electrically connected to a rectifying and filtering unit, a voltage stabilizing unit, and a DC-DC conversion module having under-voltage latch, short-circuit protection, and thermal shutdown functions in sequence.

The conventional capacitor power-taking circuit generally has the following defects:

1. the high voltage arm capacitance cannot be effectively protected.

3. How to protect the low-voltage circuit in the case of excessive idling and heavy loads is not considered.

4. Is a stand-alone device that cannot be integrated within the switch.

5. The capacitor has extremely low electricity taking efficiency.

SUMMERY OF THE UTILITY MODEL

To the defect among the prior art, the utility model aims at providing a circuit is got to electric capacity.

According to the utility model provides a pair of electric capacity is got electric circuit, include: the circuit comprises a high-voltage arm capacitor 1, a high-voltage protection circuit 2, a power taking circuit 3, a low-voltage protection circuit 4 and a rectification filter circuit 5;

one end of the high-voltage arm capacitor 1 is connected with a bus, and the other end of the high-voltage arm capacitor is connected with the high-voltage protection circuit 2;

the input end of the electricity taking circuit 3 is connected with the other end of the high-voltage arm capacitor 1, and the output end of the electricity taking circuit 3 is connected with the rectifying and filtering circuit 5 through the low-voltage protection circuit 4.

Preferably, the high voltage protection circuit 2 comprises a plurality of electronic switches.

Preferably, the power taking circuit 3 includes an isolation transformer T1;

one end of an input winding of the isolation transformer T1 is connected with the high-voltage arm capacitor 1, and the other end of the input winding is grounded;

two ends of an output winding of the isolation transformer T1 are respectively connected with two ends of the low-voltage protection circuit 4.

Preferably, the rectifying and filtering circuit 5 includes: rectifier bridge B1;

two input ends of the rectifier bridge are respectively connected with two ends of the low-voltage protection circuit 4, one output end of the two output ends of the rectifier bridge is grounded, and the other output end of the rectifier bridge is used as the output end of the capacitor power-taking circuit.

Preferably, the other output end of the rectifier bridge is grounded through a capacitor.

Preferably, the low-voltage protection circuit 4 comprises a plurality of electronic switches and a plurality of resistors, wherein one electronic switch and one resistor are connected in series to form a group, and the load is adjusted in a multi-group series-parallel connection mode, so that the purpose of protecting output is achieved.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. through the structure that uses high-voltage protection circuit, solved the electric capacity and got the soft rib that the equipment can't bear the thunderbolt, can't bear excessive pressure to through the inside resistance of high-voltage protection circuit, the effectual size that suppresses return circuit current, thereby the effectual high-voltage arm electric capacity that has protected.

2. Through the structure that uses low pressure protection circuit, solved the electric output voltage unstable condition of getting of electric capacity.

3. By using the structure of the power-taking circuit isolation transformer T1, high voltage and low voltage can be effectively separated, and a low-voltage loop can be effectively protected.

4. Through the structural design of the utility model, the high-voltage electricity taking device with the current-limiting capacitor can be integrated inside the switch or become an independent device;

5. through the utility model discloses a structural design for the efficiency of getting in whole return circuit reaches more than 50%.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is an overall frame diagram of the present invention;

fig. 2 is an overall circuit diagram of the present invention;

fig. 3 is a circuit diagram of the low voltage protection circuit of the present invention.

Detailed Description

The present invention will be described in detail with reference to the following embodiments. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the invention. These all belong to the protection scope of the present invention.

As shown in fig. 1, the utility model provides a pair of electric capacity is got electric circuit, include: the high-voltage arm capacitor comprises a high-voltage arm capacitor 1, a high-voltage protection circuit 2, a power taking circuit 3, a low-voltage protection circuit 4 and a rectification filter circuit 5.

As shown in fig. 2, in particular, one end of the high-voltage arm capacitor 1 is connected to the bus bar, and the other end is connected to the high-voltage protection circuit 2, which plays a role of current limiting in this system. The input end of the power taking circuit 3 is connected with the other end of the high-voltage arm capacitor 1, and the output end of the power taking circuit 3 is connected with the rectifying and filtering circuit 5 through the low-voltage protection circuit 4. The high voltage protection circuit 2 has a ground terminal. The primary sides of the transformer T1 of the high-voltage protection circuit 2 and the power taking circuit 3 are in parallel connection, the high-voltage protection circuit 2 is also composed of electronic switches as shown in figure 3, when the circuit voltage is normal, the switches are in an off state, the high-voltage protection belongs to a high-resistance state, when the circuit voltage is abnormal, the switches are quickly closed, so that the purpose of quickly discharging current to protect the power taking unit 3 is achieved, and when the circuit is struck by lightning or has induced voltage, the high-voltage protection circuit can also quickly act to protect the power taking circuit.

The power supply circuit 3 comprises an isolation transformer T1, one end of an input winding of the isolation transformer T1 is connected with the high-voltage arm capacitor 1, the other end of the input winding is grounded, and two ends of an output winding of the isolation transformer T1 are respectively connected with two ends of the low-voltage protection circuit 4. By directly connecting the high-voltage arm capacitor 1 and the power taking circuit 3 in series, the taken effective power is up to 10W-15W, and the leakage current of the whole high-voltage loop is not higher than 10 ma.

The rectifying-and-filtering circuit 5 includes: and two input ends of the rectifier bridge B1 are respectively connected with two ends of the low-voltage protection circuit 4, one output end of the two output ends of the rectifier bridge is grounded, and the other output end of the rectifier bridge is used as the output end of the capacitor power-taking circuit. The other output end of the rectifier bridge is grounded through a capacitor.

As shown in fig. 3, the low-voltage protection circuit 4 includes a plurality of electronic switches and a plurality of resistors, each electronic switch and each resistor are connected in series to form a group, and the groups are connected in series and parallel. When the voltage rises, the fast electronic switch is started, the resistor is connected, and then the power is consumed, so that the purposes of stabilizing the output and protecting the rectifying and filtering circuit 5 are achieved

The rectifying and filtering circuit 5 is connected with the output of the low-voltage protection circuit 4, and the rectifying and filtering power 5 rectifies the alternating current output by the power taking circuit 3 through the low-voltage protection circuit 4 into direct current output with low ripples.

In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

The foregoing description of the specific embodiments of the invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims

1. A capacitor power-taking circuit is characterized by comprising: the high-voltage arm capacitor comprises a high-voltage arm capacitor (1), a high-voltage protection circuit (2), a power taking circuit (3), a low-voltage protection circuit (4) and a rectifying and filtering circuit (5);

one end of the high-voltage arm capacitor (1) is connected with a bus, and the other end of the high-voltage arm capacitor is connected with the high-voltage protection circuit (2);

the input end of the electricity taking circuit (3) is connected with the other end of the high-voltage arm capacitor (1), and the output end of the electricity taking circuit (3) is connected with the rectifying and filtering circuit (5) through the low-voltage protection circuit (4).

2. The capacitance power taking circuit according to claim 1, wherein the high voltage protection circuit (2) comprises a plurality of electronic switches.

3. The capacitance power taking circuit according to claim 1, wherein the power taking circuit (3) comprises an isolation transformer T1;

one end of an input winding of the isolation transformer T1 is connected with the high-voltage arm capacitor (1), and the other end of the input winding is grounded;

and two ends of an output winding of the isolation transformer T1 are respectively connected with two ends of the low-voltage protection circuit (4).

4. The capacitance power taking circuit according to claim 1, wherein the rectifying and filtering circuit (5) comprises: rectifier bridge B1;

two input ends of the rectifier bridge are respectively connected with two ends of the low-voltage protection circuit (4), one output end of the two output ends of the rectifier bridge is grounded, and the other output end of the rectifier bridge is used as the output end of the capacitor power-taking circuit.

5. The capacitance power taking circuit according to claim 4, wherein the other output end of the rectifier bridge is grounded through a capacitor.

6. The capacitance power taking circuit according to claim 1, wherein the low voltage protection circuit (4) comprises a plurality of electronic switches and a plurality of resistors, one electronic switch and one resistor are connected in series to form a group, and the load is adjusted by a plurality of groups of series-parallel connection to achieve the purpose of protecting output.