High-voltage pre-regulation voltage reduction circuit for use in wide input range

A step-down circuit and pre-adjustment technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as chips not working properly

Inactive Publication Date: 2010-10-06
INST OF ELECTRONICS & INFORMATION ENG IN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If so image 3 The pre-adjusted step-down circuit can only provide an internal voltage of about 4V during cold start, so that the chip cannot work normally

Method used

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  • High-voltage pre-regulation voltage reduction circuit for use in wide input range
  • High-voltage pre-regulation voltage reduction circuit for use in wide input range
  • High-voltage pre-regulation voltage reduction circuit for use in wide input range

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Embodiment Construction

[0019] In order to facilitate the understanding of those skilled in the art, the structural principle of the present invention will be further described in detail below in conjunction with specific embodiments and drawings:

[0020] Such as figure 1 As shown, the high-voltage pre-regulated step-down circuit of the present invention is connected between the external high-voltage input power input terminal Vin and the low-dropout linear regulator LDO module U3 to provide low-voltage power for the power receiving unit in the chip. The LDO module U3 can be used as As a voltage stabilizing module, but because the LDO module U3 cannot withstand high voltage, a pre-adjusting step-down module U1 must be used to reduce the high input voltage to a suitable value before the LDO module U3. The LDO is used as the input power supply. The module U1 can be connected with the undervoltage detection module U2 to detect whether the pre-adjusted step-down module U1 is undervoltage.

[0021] Such as f...

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Abstract

The invention discloses a high-voltage pre-regulation voltage reduction circuit for use in a wide input range. The high-voltage pre-regulation voltage reduction circuit is arranged in the front of a power receiving unit in a chip and comprises a high-voltage constant output circuit which can constantly output a pre-adjusted low voltage when a high voltage is input and a low-voltage follower circuit which can output an output voltage which changes along with an input voltage when the input voltage is lower than a certain threshold value, wherein the high-voltage constant output circuit and the low-voltage follower circuit are provided with a common voltage input end Vin and a common low-voltage output end Vtemp. A lower limit of the input voltage of the high-voltage pre-regulation voltage reduction circuit suitable for the wide input range can be lowered to an internal power supply voltage of the chip and can adapt to a wider input range.

Description

Technical field [0001] The present invention relates to a chip power supply circuit, in particular to a high-voltage pre-adjusted step-down circuit that converts a high-voltage DC power supply voltage external to a chip into a low-voltage DC voltage that can be used inside the chip. Background technique [0002] Current switching power supply high-voltage chips generally have two power supplies: high and low. One is the external high-voltage input power supply, which mainly supplies power to the switch tube and related modules. The other is the low-voltage internal power supply, which supplies power for the internal control part and the low-voltage circuit, and is obtained by a voltage regulator module. The voltage regulator module generally adopts the LDO (Low Dropout Regulator, low dropout linear regulator) structure, but the LDO generally cannot withstand high voltage. Previously, a pre-adjusted step-down circuit was used to reduce the high input voltage to a suitable value f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F3/02G05F3/24
Inventor 于奇宁宁罗谦刘浩
Owner INST OF ELECTRONICS & INFORMATION ENG IN
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