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Multiple-protection constant-power electronic transformer

An electronic transformer and multi-protection technology, applied in emergency protection circuit devices, AC power input conversion to DC power output, output power conversion devices, etc., can solve problems such as instability, no protection, and easy damage

Inactive Publication Date: 2014-06-18
JIANGSU SHINUO LIGHTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, judging from the electronic transformers for halogen lamps on the market recently, there are still serious deficiencies. One is that it is easily damaged without protection, and the other is that the output power is affected by the load and is unstable.

Method used

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Embodiment Construction

[0014] Specific embodiments of the present invention are as follows figure 1 , shown in 2.

[0015] The circuit can be divided into three parts: 1. Input circuit; 2. Half-bridge inverter and output circuit; 3. Control and protection circuit.

[0016] 1. Input circuit

[0017] The input circuit includes an EMI filter, rectifier bridge and general protection of the input. where the EMI filter consists of a conjugate inductor L 1 , the capacitance C 1 、C 4 and common mode capacitor C 2 、C 3 Constituted, the rectifier bridge is composed of diode D 1 、D 2 、D 3 、D 4 constitute. Fuses FU and varistor VR are short-circuit and anti-peak protection respectively.

[0018] 2. Half-bridge inverter and output circuit

[0019] The half-bridge inverter consists of NMOS tube Q 4 , Q 5 and its peripheral circuits. Its peripheral circuit has, source negative feedback resistance R 13 and R 14 , gate trigger and protection circuit including high frequency transformer L 2a , L 2...

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PUM

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Abstract

The invention relates to a multiple-protection constant-power-output electronic transformer. The electronic transformer is provided with power-end over-voltage protection and load-end overload protection, and is provided with special half-bridge inverter constant power control. According to the power-end over-voltage protection, when the voltage of a power supply is too high and exceeds a protection threshold, a half-bridge inverter stops working, and the output voltage drops to zero. According to the load-end overload protection, when the load is abnormal or over, an overload signal detected by a detection point P drives an execution circuit to start working to make the inverter stop oscillation and interrupt the output, thus protecting the electronic transformer and avoiding fault expansion. According to the half-bridge inverter constant power control, an independent active discharge circuit is arranged to enable the discharge path of a starting capacitor C9 not to pass through an inverter MOS tube so as to form independent constant-pulse trigger of the inverter and guarantee constant-power output.

Description

technical field [0001] The invention relates to a multiple protection constant power electronic transformer. This electronic transformer is designed with multiple protection functions and constant power control functions, so it is safer, more reliable, and has excellent load performance. technical background [0002] A transformer is an electrical appliance that works on the principle of electromagnetic induction. Because it can transform voltage, current, and impedance, it can perform power transmission, signal transmission, and impedance matching in the fields of electric power and telecommunications. It is a device that plays a vital role. . [0003] The traditional power frequency transformer is an iron-core transformer, which works at a power frequency of 50Hz, and can step up or step down to convert the power frequency AC voltage. It is one of them for 12V or 24V halogen lamps. [0004] With the development of electronic technology, electronic transformers have appea...

Claims

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Application Information

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IPC IPC(8): H02H7/122H02H3/06H02M7/5383
Inventor 施金本蔡红斌叶宝芹
Owner JIANGSU SHINUO LIGHTING
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