CN204928558U - Digital chip switching power supply of drive triode that stand -by power consumption is little - Google Patents

Abstract

The utility model discloses a digital chip switching power supply of drive triode that stand -by power consumption is little, including bridge heap, transformer, it still includes: MOS pipe, triode, PWM chip, wherein PWM chip model is G5177, the output that the bridge is piled is connected with the one end of first resistance and first electric capacity respectively, the other end ground connection of first electric capacity, the other end of first resistance passes through second resistance to be connected with the drain electrode of MOS pipe, the source electrode of MOS pipe and the VDD pin connection of PWM chip, and the grid of MOS pipe and the ASU pin connection of PWM chip, the initiating terminal of the vice limit of transformer winding is connected with the anode of first diode, and the negative pole of first diode is connected respectively with the one end of the VDD pin of PWM chip, second electric capacity, and the end end of the vice limit of transformer winding and the other end of second electric capacity be ground connection respectively. The utility model discloses a switching power supply can realize the advantage that ultralow pick -up current, high quick dynamic load response, stand -by power consumption hang down.

Description

The digit chip Switching Power Supply of the driving triode that stand-by power consumption is little

[technical field]

The utility model relates to the digit chip Switching Power Supply of the little driving triode of a kind of stand-by power consumption.

[background technology]

In prior art, Switching Power Supply mostly uses analog chip, and analog chip efficiency is low, stand-by power consumption is high, current precision is low.For this reason, a kind of ultralow starting current, high dynamic load response fast, digit chip Switching Power Supply that stand-by power consumption is low is needed.

[utility model content]

The utility model provides the digit chip Switching Power Supply of the little driving triode of a kind of stand-by power consumption, and its ultralow starting current, high dynamic load response fast, stand-by power consumption are low.

The technical solution of the utility model is:

A digit chip Switching Power Supply for the driving triode that stand-by power consumption is little, comprises bridge heap, transformer, also comprises: metal-oxide-semiconductor, triode, PWM chip; Wherein PWM chip model is G5177;

The output of bridge heap is connected with one end of the first resistance and the first electric capacity respectively, the other end ground connection of the first electric capacity; The other end of the first resistance is connected with the drain electrode of metal-oxide-semiconductor by the second resistance, the source electrode of metal-oxide-semiconductor is connected with the VDD pin of PWM chip, the grid of metal-oxide-semiconductor is connected with the ASU pin of PWM chip, the initiating terminal of transformer secondary winding is connected with the anode of the first diode, the negative pole of the first diode is connected respectively with one end of the VDD pin of PWM chip, the second electric capacity, the end end of transformer secondary winding and the other end of the second electric capacity ground connection respectively;

The GND pin ground connection of PWM chip, the DRV pin of PWM chip is connected with the base stage of triode, the collector electrode of triode is connected with the initiating terminal of transformer primary side, the emitter of triode is by the 5th grounding through resistance, the initiating terminal of transformer secondary winding is successively by the 3rd resistance, the 4th grounding through resistance, 3rd electric capacity is connected to the two ends of the 4th resistance, the CS pin of PWM chip is connected between the emitter of triode and the 5th resistance, and the FB pin of PWM chip is connected between the 3rd resistance and the 4th resistance.

Digit chip Switching Power Supply of the present utility model, adopts digital PWM chip G5177, when not having load or load is less, making the power consumption of the first resistance and the second resistance be zero, reaching the advantage that stand-by power consumption is low by disconnecting metal-oxide-semiconductor; Digital PWM chip G5177 is worth as detecting by the partial pressure value between the 3rd resistance and the 4th resistance, controls to drive triode, realizes the advantage of ultralow starting current, high dynamic load response fast.

[accompanying drawing explanation]

Fig. 1 is the circuit theory diagrams of the utility model Switching Power Supply.

[embodiment]

In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and the embodiments, the utility model is further elaborated.Should be appreciated that embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.

Below in conjunction with accompanying drawing, one detailed elaboration is done to specific embodiment of the utility model.

Please refer to Fig. 1, the digit chip Switching Power Supply of the driving triode that a kind of stand-by power consumption of the present utility model is little, comprise bridge heap BD1, transformer T1, also comprise: metal-oxide-semiconductor Q2, triode Q1, PWM chip; Wherein PWM chip model is G5177, and for available chip can be purchased in market, concrete manufacturer is global Semiconductor Co., Ltd, English GLOBALSEMICONDUCTORLIMITED by name;

The output of bridge heap BD1 is connected with one end of the first resistance R1 and the first electric capacity C1 respectively, the other end ground connection of the first electric capacity C1; The other end of the first resistance R1 is connected with the drain electrode of metal-oxide-semiconductor Q2 by the second resistance R2, the source electrode of metal-oxide-semiconductor Q2 is connected with the VDD pin of PWM chip, the grid of metal-oxide-semiconductor Q2 is connected with the ASU pin of PWM chip, the initiating terminal of transformer T1 vice-side winding is connected with the anode of the first diode D1, the negative pole of the first diode D1 is connected respectively with one end of the VDD pin of PWM chip, the second electric capacity C2, the end end of transformer T1 vice-side winding and the other end of the second electric capacity C2 ground connection respectively;

The GND pin ground connection of PWM chip, the DRV pin of PWM chip is connected with the base stage of triode Q1, the collector electrode of triode Q1 is connected with the initiating terminal on the former limit of transformer T1, the emitter of triode Q1 is by the 5th resistance R5 ground connection, the initiating terminal of transformer T1 vice-side winding is successively by the 3rd resistance R3, the 4th resistance R4 ground connection, 3rd electric capacity C3 is connected to the two ends of the 4th resistance R4, the CS pin of PWM chip is connected between the emitter of triode Q1 and the 5th resistance R5, and the FB pin of PWM chip is connected between the 3rd resistance R3 and the 4th resistance R4.

Digit chip Switching Power Supply of the present utility model, adopts digital PWM chip G5177, when not having load or load is less, making the power consumption of the first resistance and the second resistance be zero, reaching the advantage that stand-by power consumption is low by disconnecting metal-oxide-semiconductor; Digital PWM chip G5177 is worth as detecting by the partial pressure value between the 3rd resistance and the 4th resistance, controls to drive triode, realizes the advantage of ultralow starting current, high dynamic load response fast.

Above-described the utility model execution mode, does not form the restriction to the utility model protection range.Any do within spirit of the present utility model and principle amendment, equivalent to replace and improvement etc., all should be included within claims of the present utility model.

Claims (1)

1. a digit chip Switching Power Supply for the driving triode that stand-by power consumption is little, comprises bridge heap, transformer, it is characterized in that, also comprise: metal-oxide-semiconductor, triode, PWM chip; Wherein PWM chip model is G5177;

The output of bridge heap is connected with one end of the first resistance and the first electric capacity respectively, the other end ground connection of the first electric capacity; The other end of the first resistance is connected with the drain electrode of metal-oxide-semiconductor by the second resistance, the source electrode of metal-oxide-semiconductor is connected with the VDD pin of PWM chip, the grid of metal-oxide-semiconductor is connected with the ASU pin of PWM chip, the initiating terminal of transformer secondary winding is connected with the anode of the first diode, the negative pole of the first diode is connected respectively with one end of the VDD pin of PWM chip, the second electric capacity, the end end of transformer secondary winding and the other end of the second electric capacity ground connection respectively;

The GND pin ground connection of PWM chip, the DRV pin of PWM chip is connected with the base stage of triode, the collector electrode of triode is connected with the initiating terminal of transformer primary side, the emitter of triode is by the 5th grounding through resistance, the initiating terminal of transformer secondary winding is successively by the 3rd resistance, the 4th grounding through resistance, 3rd electric capacity is connected to the two ends of the 4th resistance, the CS pin of PWM chip is connected between the emitter of triode and the 5th resistance, and the FB pin of PWM chip is connected between the 3rd resistance and the 4th resistance.