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No-load protection circuit

A no-load protection and circuit technology, applied in electrical components and other directions, to achieve the effect of strong versatility, simple circuit structure, and stable input current

Active Publication Date: 2021-03-26
ZHEJIANG KAIYAO LIGHTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This invention mainly solves the problem of no-load protection in the prior art without affecting the power supply; it provides a no-load protection circuit as the periphery of the driver chip Circuit, detecting the change of the output voltage and controlling the drive chip to start the protection function, without affecting the working condition of the power supply

Method used

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Embodiment

[0022] A no-load protection circuit of this embodiment, such as Figure 1-3 As shown, it includes driver chip U1 with protection function, voltage regulator module, drive output module, pull-up resistor, pull-down resistor, transformer, anti-backflow protection module and NPN transistor QS43, NPN transistor QS41A and NPN transistor QS41B.

[0023] The anti-backflow protection module is arranged between the triode QS43 and the protection trigger terminal of the driving chip U1. The anti-backflow protection module prevents the current in the circuit from flowing back into the driver chip U1, and protects the normal operation of the driver chip U1.

[0024] The driver chip U1 with protection function can perform protection actions according to the signal of the protection trigger terminal. The model of the driver chip U1 can be ICL5101, ICL5102 or TEA19161T, etc. In this embodiment, the model of the driver chip U1 is UBA1313, and its protection trigger terminal is pin 5.

[002...

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PUM

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Abstract

The invention discloses a no-load protection circuit. The problem of no-load protection under the condition of not influencing the work of a power supply in the prior art is solved. The circuit comprises a driving chip U1 with a protection function, a voltage stabilizing module, a driving output module, a pull-up resistor, a pull-down resistor, a transformer and a triode QS43; the output terminalof the driving chip is connected with a driving output module, and the driving output module comprises a transformer primary side; the secondary side of the transformer is connected with a base electrode of the triode QS43 through the voltage stabilizing module, a collector electrode of the triode QS43 is connected with a protection trigger terminal of the driving chip, an emitter electrode of thetriode QS43 is connected with the first end of the pull-down resistor, and the second end of the pull-down resistor is connected with the secondary side of the transformer; the first end of the pull-up resistor is connected with a base electrode of the triode QS43, and the second end of the pull-up resistor is connected with the first end of the pull-down resistor. The circuit serves as a peripheral circuit of a driving chip, is simple in structure, does not affect the working condition of a power supply during triggering protection, and is suitable for driving chips of different types.

Description

technical field [0001] The invention relates to the field of protection circuits, in particular to a no-load protection circuit. Background technique [0002] At no-load, if there is no protection circuit, the voltage will continue to rise and exceed the withstand voltage value of components, such as output diodes, resulting in damage to the circuit. With the improvement of people's requirements for power supply safety regulations, the requirement of power supply protection under no-load conditions is becoming more and more routine. Even integrated lamps also have the risk of no-load, so add no-load protection without affecting the power supply. function is particularly important. [0003] Most of the existing no-load protection circuits are coupled with the power supply circuit, and starting the no-load protection will affect the operation of the power supply. For example, a "over-current no-load protection circuit, emergency light device, and lighting system" disclosed i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B47/20
CPCH05B47/20
Inventor 钟锦洋张晨查丰盛
Owner ZHEJIANG KAIYAO LIGHTING