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A wide input voltage supply device

A technology of power supply device and wide input, applied in the field of wide input voltage power supply device, can solve the problems of large power loss of the adjustment transistor, heating of the adjustment transistor, influence on reliability, etc., and achieve the effects of low cost, reduced power loss, and high reliability.

Active Publication Date: 2018-12-28
安徽北方微电子研究院集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this structure has a defect, that is, when the input voltage is small (the voltage range that the follow-up circuit can withstand) and the supply current is large, the power loss of the adjusting transistor is very large, and the adjusting transistor generates serious heat, which has an impact on reliability.

Method used

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  • A wide input voltage supply device

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Embodiment Construction

[0012] Such as figure 1 As shown, the present invention provides a wide input voltage power supply device, including resistors R1, R2, R3, R4, R5, R6, R7, diodes V1, V3, V6, PMOS transistors V2, V4, V5, triode V7 and capacitor C1 .

[0013] Resistors R1 and R2 are connected in series between the external voltage input Vin and GND, the connection terminals of R1 and R2 are connected to the gate of PMOS transistor V5, the source of PMOS transistor V5 is connected to GND, resistor R6 and diode V6 are connected in series between the external voltage input Vin and Between GND, the connecting end of resistor R6 and diode V6 is connected to the drain of PMOS transistor V5; one end of resistor R7 is connected to the connecting end of resistor R6 and V6, and the other end is connected to the base of triode V7; the collector of triode V7 Connect the voltage input terminal Vin, the emitter connection voltage terminal Vi.

[0014] The resistor R3 and the diode V1 are connected in series...

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Abstract

A wide input voltage supply device includes resistors R1, R2, R3, R4, R5, R6, R7, diodes V1, V3, V6, PMOS transistors V2, V4, V5, a transistor V7, and a capacitor C1. The diode V3, the PMOS transistorV4 and the resistors R4, R5 constitute a first overvoltage detection threshold circuit; the PMOS transistor V2, the diode V1, and the resistor R3 constitute a second overvoltage detection threshold circuit, the PMOS transistor V5, the diode V6, the diode V7, and the resistors R1, R2, R6, R7 constitute a third overvoltage detection threshold circuit. Three PMOS transistors are used to form three overvoltage detection thresholds, to control the input voltage supply device in sections, to control the two PMOS transistors by judging the input voltage range (range of voltage follow-up circuits canwithstand) when the input voltage is lower, so as to ensure that the input voltage is directly supplied to the follow-up circuit, thereby reducing the power loss of the triode and adjusting the serious phenomenon of the triode heating; the device has the advantages of simple structure, low cost and high reliability.

Description

technical field [0001] The invention relates to the technical field of switching power supplies, in particular to a wide input voltage power supply device. Background technique [0002] The wide input supply voltage range of the switching power supply is generally composed of a linear voltage regulator circuit, which mainly includes a current limiting resistor, a voltage regulator tube, and an adjustment transistor. But this structure has a defect, that is, when the input voltage is small (the voltage range that the follow-up circuit can withstand) and the supply current is large, the power loss of the adjusting transistor is very large, and the adjusting transistor generates serious heat, which has an impact on reliability. Contents of the invention [0003] The purpose of the present invention is to provide a wide input voltage power supply device, which can reduce the power loss of the triode adjustment for the power supply circuit, solve the phenomenon of serious heati...

Claims

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Application Information

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IPC IPC(8): H02M3/158
CPCH02M3/158H02M1/0054Y02B70/10
Inventor 桑泉陈雪山
Owner 安徽北方微电子研究院集团有限公司