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Discharge circuit and AC power supply device

A discharge circuit and AC power supply technology, applied in the direction of output power conversion devices, electrical components, etc., can solve problems such as hidden dangers, safety, and affecting the stability of power boards, so as to save costs, ensure stability, and reduce manual discharge. The effect of steps

Active Publication Date: 2019-01-18
HEFEI HUIKE JINYANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a discharge circuit and an AC power supply device, aiming to solve the problem that when the AC startup chip is used in the prior art, there is no dummy load behind the large capacitor, and if the large capacitor is not discharged in time, it will affect the stability of the power board and Issues with potential safety hazards

Method used

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  • Discharge circuit and AC power supply device
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  • Discharge circuit and AC power supply device

Examples

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Embodiment 1

[0027] The first embodiment of the present invention provides a discharge circuit.

[0028] figure 2 A block diagram of the discharge circuit provided by the first embodiment of the present invention is shown. For ease of description, only parts related to the embodiments of the present invention are shown.

[0029] A discharge circuit connected to the power supply pin VCC and the high voltage pin HV of the AC power startup chip U1, the discharge circuit comprising:

[0030] The first end is connected to the power supply pin VCC of the AC power startup chip U1, and the current limiting resistor R5 is used for current limiting;

[0031] Connected to the high voltage pin HV of the AC power starting chip U1, when the power is turned off, the discharge unit 101 discharges the energy storage large capacitor EC1 connected to the high voltage pin HV of the power starting chip U1;

[0032] It is connected with the discharge unit 101 , the second end of the current limiting resisto...

Embodiment 2

[0046] The second embodiment of the present invention provides an AC power supply device.

[0047] Figure 4 A circuit structure diagram of the AC power supply device provided by the second embodiment of the present invention is shown. For ease of description, only parts related to the embodiments of the present invention are shown.

[0048] An AC power supply device includes an AC power starting chip U1, the AC power supply device also includes a discharge circuit, the discharge circuit is connected to the power pin VCC and the high voltage pin HV of the AC power starting chip U1, and the discharging circuit includes:

[0049] The first end is connected to the power supply pin VCC of the AC power startup chip U1, and the current limiting resistor R5 is used for current limiting;

[0050] Connected to the high voltage pin HV of the AC power starting chip U1, when the power is turned off, the discharge unit 101 discharges the energy storage large capacitor EC1 connected to th...

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Abstract

The invention relates to the technical field of power supply management, and provides a discharge circuit and an AC power supply device. The discharge circuit is connected with the AC power starting chip, including a discharge unit and a switch unit, and the switch unit is connected with the discharge unit, the power pin of the AC power starting chip and the high voltage pin of the AC power starting chip, and the discharge unit is connected with the AC power starting chip. The high voltage pin of the power starting chip is connected. When the power is turned off, the switch unit controls the discharge unit to open, and discharges the large capacitor connected to the high voltage pin of the AC power starting chip, so that the voltage at both ends is at a safe level. In this way, it not only ensures the stability of the power board, but also avoids the potential safety hazard caused by the untimely discharge of large capacitors. At the same time, the steps of manual discharge are reduced, saving time, effort and cost.

Description

technical field [0001] The invention relates to the technical field of power management, in particular to a discharge circuit and an AC power supply device. Background technique [0002] At present, the topological structure of the power supply design power between 10W-90W adopts the flyback type (that is, AC-DC) to achieve specific power. As early as 4-5 years ago, the chip startup function designed by the chip manufacturer used DC (Direct current, direct current) to start. The sampling after the large capacitor was connected to the power pin of the chip through several hundreds of K resistors. This design The disadvantage is that the standby power consumption of the power supply is between 0.25W-0.3W. With the development of power supply technology, countries have higher and higher energy efficiency requirements for power supplies. Subsequently, chip manufacturers launched chips that use AC (Alternating current, AC), such as figure 1 As shown, directly connect a few hund...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/32H02M1/36
CPCH02M1/32H02M1/36H02M1/322
Inventor 王智勇王平
Owner HEFEI HUIKE JINYANG TECH