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Turn-threshold-adjustable under voltage lockout (UVLO) and reference voltage circuit

A technology of reference voltage and threshold value, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problems of large power consumption and complex structure, and achieve the effect of simplifying the circuit, reducing costs, and saving standby power consumption

Active Publication Date: 2012-11-21
TIANJIN SAIXIANG M&E ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The circuit uses a reference voltage source and a logic circuit, the structure is too complex, it occupies a large area and consumes a lot of power

Method used

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  • Turn-threshold-adjustable under voltage lockout (UVLO) and reference voltage circuit
  • Turn-threshold-adjustable under voltage lockout (UVLO) and reference voltage circuit
  • Turn-threshold-adjustable under voltage lockout (UVLO) and reference voltage circuit

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Embodiment Construction

[0016] image 3 It is a structural block diagram of the undervoltage lockout and reference voltage circuit with adjustable flipping threshold of the present invention, including two modules of UVLO and VDD Reg, and realizes an internal low voltage source and reference voltage independent of temperature on the basis of the undervoltage lockout circuit. The core of the UVLO module is a bandgap comparator. Compared with the traditional bandgap comparator, the present invention adds an NMOS transistor to one branch of the triode, which speeds up the output flipping speed when the power supply voltage reaches the falling threshold. The VDD Reg module realizes a reference voltage with small temperature drift through a bandgap comparator and a negative feedback structure, and at the same time feeds back the undervoltage lockout signal vddgd_b to the chip.

[0017] When V CC rise to V CC(on) , the UVLO module outputs a high level, and the VDD Reg module outputs an internal low-volta...

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Abstract

The invention relates to the field of integrated circuit design. In order to achieve the goals of monitoring power supply voltage of a PFC (power factor controller) chip and simultaneously realizing internal low-voltage source and reference circuit which are not related to temperature, the invention adopts the technical scheme that a turn-threshold-adjustable under voltage lockout (UVLO) and reference voltage circuit comprises a UVLO module and a VDD Reg module; the UVLO module outputs voltage to the VDD Reg module; when the input voltage VCC of the UVLO module is increased to VCC (on), the UVLO module outputs high-level voltage, the VDD Reg module outputs non-temperature-related internal low-voltage power VDD, reference voltage Vref, vddgd and under voltage lockout signals vddgd_b, and the under voltage lockout signals vddgd_b are low-level voltage; and when the VCC is decreased to VCC (off), the UVLO module outputs low-level voltage. The turn-threshold-adjustable UVLO and reference voltage circuit is mainly applied to integrated circuit design.

Description

technical field [0001] The present invention relates to the field of integrated circuit design, in particular to an undervoltage lockout (under voltage lockout, UVLO) and a reference voltage circuit with an adjustable inversion threshold of a PFC chip, specifically, an undervoltage lockout with an adjustable inversion threshold and a reference voltage circuit. Background technique [0002] As power factor correction technology is increasingly used in switching power supplies, frequency converters and fluorescent lamp ballasts, the performance requirements for power factor correction chips are getting higher and higher. figure 1 It is a typical chip power-on process. The 220V AC mains supply passes through a bridge rectifier to obtain a pulsating DC voltage, which passes through the resistor R start , to C Vcc capacitor charges, thereby achieving chip supply voltage V CC rises from 0 when V CC When charging to the normal operation of the chip, due to the consumption of in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
Inventor 高静付园园徐江涛姚素英史再峰
Owner TIANJIN SAIXIANG M&E ENG CO LTD
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