CN203025641U - Computer power supply system with soft start circuit - Google Patents

Abstract

The utility model discloses a computer power supply system with a soft start circuit. The computer power supply system with the soft start circuit comprises an input end circuit, an output end circuit, a pulse width modulation circuit and a soft start circuit, wherein the input end circuit is connected with input voltage; the output end circuit is used for outputting the obtained voltage; the pulse width modulation circuit is used for sampling the voltage output by the output end circuit to generate a pulse width modulation signal; and the soft start circuit is used for eliminating surge current of a transformer of the output end circuit during start. By utilizing the soft start circuit provided by the utility model, the surge current of the computer power supply system during start can be better eliminated.

Description

Computer power supply system with soft starting circuit

Technical field

The utility model relates to soft starting circuit, refers more particularly to the soft starting circuit for computer power supply system.

Background technology

In the computer power supply system start-up course, inrush current can appear in the transformer in system, for the elimination to this electric current, has just designed soft starting circuit.

Summary of the invention

The utility model is intended to solve the deficiencies in the prior art, and a kind of soft starting circuit that can eliminate the surge current of computer power supply system when starting is provided.

With the computer power supply system of soft starting circuit, comprise inlet circuit, circuit of output terminal, pulse-width modulation circuit and soft starting circuit:

Described inlet circuit is to connect input voltage;

Described circuit of output terminal is resulting Voltage-output;

Described pulse-width modulation circuit is the voltage sample generation pulse-width signal to described circuit of output terminal output;

Described soft starting circuit is used for eliminating the surge current of transformer when starting of described circuit of output terminal.

Described soft starting circuit comprises the first current source, a NMOS pipe, the 2nd NMOS pipe, a PMOS pipe, the 2nd PMOS pipe, the first electric capacity:

One termination power of described the first current source, the grid of the grid of the described NMOS pipe of another termination and drain electrode and described the 2nd NMOS pipe;

The grid of a described NMOS pipe connects an end of described the first current source and the grid of described the 2nd NMOS pipe, and drain electrode connects an end of described the first current source and the grid of described the 2nd NMOS pipe, source ground;

The grid of described the 2nd NMOS pipe connects an end of described the first current source and the grid of a described NMOS pipe, and drain electrode connects the grid of a described PMOS pipe and the grid of drain electrode and described the 2nd PMOS pipe, source ground;

The grid of a described PMOS pipe connects the drain electrode of grid and described the 2nd NMOS pipe of described the 2nd PMOS pipe, and drain electrode connects the drain electrode of grid and described the 2nd NMOS pipe of described the 2nd PMOS pipe, and source electrode connects power supply;

The grid of described the 2nd PMOS pipe connects the drain electrode of grid and described the 2nd NMOS pipe of a described PMOS pipe, and drain electrode connects an end and the described pulse-width modulation circuit of described the first electric capacity, and source electrode connects power supply;

Drain electrode and the described pulse-width modulation circuit of described the 2nd PMOS pipe of one termination of described the first electric capacity.

Utilize the soft starting circuit that the utility model provides to eliminate better the surge current of computer power supply system when starting.

Description of drawings

Fig. 1 is the circuit diagram of the computer power supply system with soft starting circuit of the present utility model.

Embodiment

Below in conjunction with accompanying drawing, the utility model content is further illustrated.

With the computer power supply system of soft starting circuit, as shown in Figure 1, comprise inlet circuit 100, circuit of output terminal 200, pulse-width modulation circuit 300 and soft starting circuit 400:

Described inlet circuit 100 is to connect input voltage AC;

Described circuit of output terminal 200 is resulting Voltage-output;

Described pulse-width modulation circuit 300 is the voltage sample generation pulse-width signals to described circuit of output terminal 200 outputs;

Described soft starting circuit 400 is used for eliminating the surge current of transformer when starting of described circuit of output terminal 200.

Described soft starting circuit 400 comprises the first current source 401, NMOS pipe the 402, the 2nd NMOS pipe the 403, the one PMOS pipe the 404, the 2nd PMOS pipe 405, first electric capacity 406:

One termination power VCC of described the first current source 401, the grid of the grid of the described NMOS pipe 402 of another termination and drain electrode and described the 2nd NMOS pipe 403;

The grid of a described NMOS pipe 402 connects an end of described the first current source 401 and the grid of described the 2nd NMOS pipe 403, and drain electrode connects an end of described the first current source 401 and the grid of described the 2nd NMOS pipe 403, source ground;

The grid of described the 2nd NMOS pipe 403 connects an end of described the first current source 401 and the grid of a described NMOS pipe 402, and drain electrode connects the grid of a described PMOS pipe 404 and the grid of drain electrode and described the 2nd PMOS pipe 405, source ground;

The grid of a described PMOS pipe 404 connects the drain electrode of grid and described the 2nd NMOS pipe 403 of described the 2nd PMOS pipe 405, and drain electrode connects the drain electrode of grid and described the 2nd NMOS pipe 403 of described the 2nd PMOS pipe 405, and source electrode meets power supply VCC;

The grid of described the 2nd PMOS pipe 405 connects the drain electrode of grid and described the 2nd NMOS pipe 403 of a described PMOS pipe 404, and drain electrode connects an end and the described pulse-width modulation circuit 300 of described the first electric capacity 406, and source electrode meets power supply VCC;

Drain electrode and the described pulse-width modulation circuit 300 of described the 2nd PMOS pipe 405 of one termination of described the first electric capacity 406.

The utility model discloses a kind of computer power supply system with soft starting circuit, and describe embodiment of the present utility model and effect with reference to the accompanying drawings.What should be understood that is: above-described embodiment is just to explanation of the present utility model, rather than to restriction of the present utility model, any innovation and creation that do not exceed in the utility model connotation scope are within all falling into the utility model protection domain.

Claims (2)

1. with the computer power supply system of soft starting circuit, it is characterized in that comprising inlet circuit, circuit of output terminal, pulse-width modulation circuit and soft starting circuit:

Described inlet circuit is to connect input voltage;

Described circuit of output terminal is resulting Voltage-output;

Described pulse-width modulation circuit is the voltage sample generation pulse-width signal to described circuit of output terminal output;

Described soft starting circuit is used for eliminating the surge current of transformer when starting of described circuit of output terminal.

2. as claimed in claim 1 with the computer power supply system of soft starting circuit, it is characterized in that described soft starting circuit comprises the first current source, a NMOS pipe, the 2nd NMOS pipe, a PMOS pipe, the 2nd PMOS pipe, the first electric capacity:

One termination power of described the first current source, the grid of the grid of the described NMOS pipe of another termination and drain electrode and described the 2nd NMOS pipe;

The grid of a described NMOS pipe connects an end of described the first current source and the grid of described the 2nd NMOS pipe, and drain electrode connects an end of described the first current source and the grid of described the 2nd NMOS pipe, source ground;

The grid of described the 2nd NMOS pipe connects an end of described the first current source and the grid of a described NMOS pipe, and drain electrode connects the grid of a described PMOS pipe and the grid of drain electrode and described the 2nd PMOS pipe, source ground;

The grid of a described PMOS pipe connects the drain electrode of grid and described the 2nd NMOS pipe of described the 2nd PMOS pipe, and drain electrode connects the drain electrode of grid and described the 2nd NMOS pipe of described the 2nd PMOS pipe, and source electrode connects power supply;

The grid of described the 2nd PMOS pipe connects the drain electrode of grid and described the 2nd NMOS pipe of a described PMOS pipe, and drain electrode connects an end and the described pulse-width modulation circuit of described the first electric capacity, and source electrode connects power supply;

Drain electrode and the described pulse-width modulation circuit of described the 2nd PMOS pipe of one termination of described the first electric capacity.

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