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Main/standby power conversion detection circuit capable of switching off power supply IC for power supply module

A power module and detection circuit technology, applied in the field of electronics, can solve the problems of burning the power supply, power supply IC heating, power supply IC conduction cycle length, etc., to achieve simple and reliable circuit structure, avoid power supply fluctuations, avoid heating or even burning. Effect

Pending Publication Date: 2020-11-10
BAIYI LIGHTING (SHANGHAI) HLDG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, because the input voltage is too low, the conduction period of the power IC will be longer, which will cause the power IC to heat up severely when the input voltage is low, and even burn the power supply, causing safety hazards

Method used

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  • Main/standby power conversion detection circuit capable of switching off power supply IC for power supply module

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Embodiment

[0033] Example: such as figure 1 As shown, the embodiment of the present invention includes a primary / standby power conversion detection circuit for a power supply IC that can be turned off in a power supply module. The backup power conversion detection circuit is used in the AC power supply module, and is used to monitor whether the input AC voltage of the power module is undervoltage, and sends a signal to the control module IC4 when the input AC voltage is undervoltage, prompting it to switch the power supply mode, While shutting down the power IC ( figure 1 IC1 in ).

[0034] The power module involved in this embodiment includes: a power IC for chopping, a rectifier module, a transformer, and an output filter module. Specifically, the rectification module includes a rectification bridge DB1 and an electrolytic capacitor C1. The input terminal of the rectifier module is connected to the AC input terminal, and the negative pole of the output terminal is grounded; the posi...

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PUM

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Abstract

The invention discloses a main / standby power conversion detection circuit capable of switching off a power supply IC for a power supply module. The main / standby power conversion detection circuit comprises an input voltage module, a reference voltage module, a comparator, an optocoupler module and a power supply IC control module, wherein the input voltage module is connected with the AC input endof the power supply module and is used for filtering and dividing the voltage of the AC input end, the comparator compares the output voltage of the input voltage module with the output voltage of the reference voltage module, the optocoupler module is disconnected when the output voltage of the input voltage module is too low, and the power supply IC is controlled to be disconnected through thepower supply IC control module. The main / standby power conversion detection circuit can continuously detect the input voltage of the AC input end, automatically turn off the power supply IC when the input voltage is under-voltage, and turn on the power supply IC when the input voltage is normal, thereby realizing the under-voltage protection of the power supply IC, and avoiding the problems of heating and even burnout caused by the long-term operation of the power supply IC under the condition of low voltage.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a main-standby power conversion detection circuit for a power supply IC that can be turned off in a power supply module. Background technique [0002] In fire lights, communication equipment or some medical equipment, the main power (AC mains) and backup power (battery) are usually backed up by each other to improve the reliability of the equipment and avoid equipment failure in the event of a power outage. The above-mentioned equipment usually has a main and backup power conversion device, which is used to switch to the backup power for power supply when the main power fails. [0003] Existing detection circuits usually consist of original components such as sampling circuits, relays, and single-chip microcomputers. The existing main and backup power switching circuits usually only switch lines during the switching process, and do not control the main power and the backup p...

Claims

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Application Information

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IPC IPC(8): H02H7/125H02H3/24H02H1/00H02M1/32H02J9/06
CPCH02H1/0007H02H3/24H02H7/125H02M1/32H02J9/068Y02B70/10Y02B70/30Y04S20/20
Inventor 杭华胡和平
Owner BAIYI LIGHTING (SHANGHAI) HLDG LTD