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A switching power supply hiccup protection and delay protection circuit

A technology of delay circuit and hiccup protection, applied in electrical components, output power conversion devices, etc., can solve problems such as increasing power supply cost and production difficulty, complex protection circuit protection delay, and reducing power supply reliability, etc. Power supply reliability, simplifying the difficulty of design timing, and reducing the effect of power supply costs

Active Publication Date: 2016-05-04
SHENZHEN VAPEL POWER SUPPLY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former circuit is very complicated, while the latter is relatively simple, but the latter still needs to solve the problem of signal matching and timing coordination between various protection circuits. reliability
Moreover, the final power supply also needs to be a protection delay circuit, so there is still the complexity of each protection circuit for protection delay

Method used

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  • A switching power supply hiccup protection and delay protection circuit
  • A switching power supply hiccup protection and delay protection circuit
  • A switching power supply hiccup protection and delay protection circuit

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Such as figure 2 As shown, after the power supply works, the DRA energy (DRA is taken from the drive output signal of the power supply PWM or from the transformer winding, etc.) is stored in the capacitor C17 through the diode D22 and the resistor R24, and the voltage of the capacitor C17 reaches the DRA voltage to complete energy storage. After the power supply works, the DRA makes the G of the MOS transistor Q14 extremely low through the resistor R88, the transistor Q15, and the resistor R58, and the protection does not operate. After the DRA has no output, the transistor Q15 is not turned on, and the energy on the capacitor C17 charges the capacitor C24 through the resistor R39 until the voltage of the capacitor C24 reaches the Gth voltage of the MOS transistor Q14, and the delay effective circuit is completed. After the voltage of the capacitor C24 reaches the Gth voltage of the MOS transistor Q14, the MOS transistor Q14 is turned on, and the OFF signal is used to ...

Embodiment 2

[0023] Such as image 3 As shown, the power supply operating state detection circuit in the first embodiment above is replaced by a mos tube.

Embodiment 3

[0025] Such as Figure 4 As shown, on the basis of the second embodiment, the comparison and confirmation execution shutdown circuit is replaced by a comparator.

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Abstract

The invention discloses a switching power supply burp protection and delay protection circuit. The switching power supply burp protection and delay protection circuit comprises a power supply working energy storage circuit, a power supply working state detection circuit, a delay circuit action delay effecting circuit, a comparison confirmation power-off implementation circuit and a power-off delay circuit, wherein the power supply working energy storage circuit consists of a diode D22, a resistor R24 and a capacitor C17; the power supply working state detection circuit comprises a resistor R88, a resistor R58 and a triode Q15; the delay circuit action delay effecting circuit comprises a resistor R39 and a capacitor C24; the comparison confirmation power-off implementation circuit consists of a triode Q14; and the power-off delay circuit consists of a capacitor C17 and a resistor R51. All delay circuits and burp circuits protected by the whole power supply can be completed by a simple delay circuit, and the circuit structure is simpler. Furthermore, the design time sequence difficulty can be greatly lowered, the power supply cost can be lowered, and the reliability of the power supply can be increased.

Description

technical field [0001] The invention relates to a switching power supply hiccup protection and delay protection circuit. Background technique [0002] In the practical application of power supply, many protections need to be made into hiccup circuits. In the prior art, each independent protection circuit is generally used as a hiccup circuit or all protection circuit signals are aggregated into a hiccup circuit. The former circuit is very complicated, while the latter is relatively simple, but the latter still needs to solve the problem of signal matching and timing coordination between various protection circuits. reliability. Moreover, the final power supply also needs to be a protection delay circuit, so there is also the complexity of each protection circuit for protection delay. Contents of the invention [0003] In view of the above-mentioned technical defects, the present invention provides a switching power supply hiccup protection and delay protection circuit, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/36
Inventor 黄铭杰刘取仁
Owner SHENZHEN VAPEL POWER SUPPLY TECH