CN203466731U

CN203466731U - Multi-path output switching power supply

Info

Publication number: CN203466731U
Application number: CN201320578246.8U
Authority: CN
Inventors: 王柯; 王小兰
Original assignee: Shaanxi Zhong Ke World Aviation Module Co Ltd
Current assignee: Shaanxi Zhong Ke World Aviation Module Co Ltd
Priority date: 2013-09-17
Filing date: 2013-09-17
Publication date: 2014-03-05
Anticipated expiration: 2023-09-17

Abstract

Disclosed in the utility model is a multi-path output switching power supply comprising an input loop, a transformer, an output loop and a feedback loop. An output terminal of the input loop is connected with a primary coil of the transformer and an input terminal of the input loop is connected with a secondary coil of the transformer. The input loop is provided with a filter capacitor, an MOS tube, resistors and a PWM control chip. The output loop includes a primary output loop and an auxiliary output loop/auxiliary output loops; a plurality of filter capacitors are arranged at the primary output loop; and one-path or multiple paths of auxiliary output loops are arranged and each path is formed by a first-level DC/DC converter for generating stable all-path auxiliary outputting. The provided multi-path output switching power supply has the advantages of simple circuit, low cost, and practicability and reliability. Only one winding is needed for the output terminal of the switch transformer; and under the circumstances of load-taking or on-load combination, both the primary output and the auxiliary output have the high voltage precisions, so that the cross regulation rate of the multi-path output switching power supply is well improved.

Description

A kind of multi-output switch power source

Technical field

The utility model relates to a kind of Switching Power Supply, especially a kind of Switching Power Supply of multichannel output.

Background technology

For multi-output switch power source, main output voltage and auxiliary output voltage meet transformer turn ratio relation, as long as make main output voltage keep stable, auxiliary output voltage also can keep stable, but in fact, owing to being subject to the impact of the resistance, current circuit parasitic parameter etc. of leakage inductance between each winding of transformer, winding, auxiliary output voltage changes with the variation of output loading.Conventionally, wherein a road can impact other one or more output circuit with load, and, when main output is fully loaded, during auxiliary output no-load, auxiliary output voltage raises; When main output no-load, auxiliary output full load, auxiliary output voltage reduces, and produces the excessive problem of cross regulation rate of multichannel output.Existing multi-output switch power source, is only to main output feedback regulation substantially, and other are auxiliary exports not feedback regulation, can only guarantee that like this main output voltage is more accurate, and other auxiliary output voltage excursions is very large.

Utility model content

The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of multi-output switch power source is provided.

The purpose of this utility model is achieved through the following technical solutions: a kind of multi-output switch power source, comprise input circuit (1), transformer (2), output loop (3) and feedback loop (4), input circuit (1) output connection transformer (2) primary coil, output loop (3) input connection transformer (2) secondary coil; Input circuit (1) comprises filter capacitor (C1), metal-oxide-semiconductor (Q1), resistance (R1, R2) and pwm chip, and transformer (2) is high frequency switch transformer; Output loop (3) comprises main output loop (5) and auxiliary output loop (6); Main output loop (5) is provided with a plurality of filter capacitors (C2, C3, C4), and main output loop (5) feeds back to the pwm chip of input circuit (1) by feedback loop (4); It is upper that auxiliary output loop (6) is connected to main output loop (5), is one or more, and each route one-level DC/DC transducer forms.

The DC/DC transducer of described auxiliary output loop (6) adopts BUCK circuit.

The DC/DC transducer of described auxiliary output loop (6) adopts BOOST circuit.

The DC/DC transducer of described auxiliary output loop (6) adopts circuit of reversed excitation.

The DC/DC transducer of described auxiliary output loop (6) adopts forward converter.

A kind of multi-output switch power source that the utility model provides, circuit is simple, with low cost, practical reliable, switch transformer output only needs a winding, main output and auxiliary output are carried or unloaded combined situation Xia，Ge road output has very high voltage accuracy at band respectively, thereby have well improved the cross regulation rate of multi-output switch power source.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model.

Embodiment

Below in conjunction with accompanying drawing, the utility model is described in further detail:

As Fig. 1, a kind of multi-output switch power source, comprises input circuit 1, transformer 2, output loop 3 and feedback loop 4, described input circuit 1 output connection transformer 2 primary coils, described output loop 3 input connection transformer 2 secondary coils; Input circuit 1 comprises filter capacitor C1, metal-oxide-semiconductor Q1, resistance R 1, R2 and pwm chip, and described transformer 2 is high frequency switch transformer T1; Described output loop 3 comprises main output loop 5 and auxiliary output loop 6; Described main output loop 5 is provided with several filter capacitors C2, C3, C4.Described main output loop 3 feeds back to the pwm chip of input circuit 1 by feedback loop 4, regulate duty ratio, stablizes the output voltage of main output loop 3; Described auxiliary output loop 6 is connected on main output loop 5, is one or more, and each route one-level DC/DC transducer forms.Described auxiliary output loop 6 is connected on main output loop 5, by DC/DC transducer, main output voltage is boosted as required or step-down is converted to the auxiliary output in each road, because each road DC/DC converter inside all has independently feedback voltage stabilizing circuit, can guarantee the stable of each road auxiliary output voltage; Described DC/DC transducer can be BUCK circuit, the BOOST circuit of not isolating, also isolated form flyback, forward converter.

The above; it is only embodiment of the present utility model; but protection range of the present utility model is not limited to this; any those of ordinary skill in the art are in the disclosed technical scope of the utility model; the variation that can expect without creative work or replacement, within all should being encompassed in protection range of the present utility model.

Claims

1. a multi-output switch power source, it is characterized in that: comprise input circuit (1), transformer (2), output loop (3) and feedback loop (4), input circuit (1) output connection transformer (2) primary coil, output loop (3) input connection transformer (2) secondary coil; Input circuit (1) comprises filter capacitor (C1), metal-oxide-semiconductor (Q1), resistance (R1, R2) and pwm chip, and transformer (2) is high frequency switch transformer; Output loop (3) comprises main output loop (5) and auxiliary output loop (6); Main output loop (5) is provided with a plurality of filter capacitors (C2, C3, C4), and main output loop (5) feeds back to the pwm chip of input circuit (1) by feedback loop (4); It is upper that auxiliary output loop (6) is connected to main output loop (5), is one or more, and each route one-level DC/DC transducer forms.

2. a kind of multi-output switch power source according to claim 1, is characterized in that: the DC/DC transducer of described auxiliary output loop (6) adopts BUCK circuit.

3. a kind of multi-output switch power source according to claim 1, is characterized in that: the DC/DC transducer of described auxiliary output loop (6) adopts BOOST circuit.

4. a kind of multi-output switch power source according to claim 1, is characterized in that: the DC/DC transducer of described auxiliary output loop (6) adopts circuit of reversed excitation.

5. a kind of multi-output switch power source according to claim 1, is characterized in that: the DC/DC transducer of described auxiliary output loop (6) adopts forward converter.