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Magnetic amplifier auxiliary output circuit of isolation switch power source

A technology for isolating switching power supplies and magnetic amplifiers, which is applied in output power conversion devices, conversion of AC power input to DC power output, electrical components, etc. , to achieve the effect of reducing conduction loss

Inactive Publication Date: 2004-12-15
YIBO POWER SUPPLY CO LTD HANGZHOU
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, using figure 2 In the application of low output voltage and large output current, the additional voltage drop of the freewheeling diode D32 during the blocking time of the magnetic amplifier cannot be ignored, and the corresponding loss is very large, which not only affects the circuit performance of the magnetic amplifier, but also produces Power loss brings problems such as difficult heat treatment

Method used

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  • Magnetic amplifier auxiliary output circuit of isolation switch power source
  • Magnetic amplifier auxiliary output circuit of isolation switch power source
  • Magnetic amplifier auxiliary output circuit of isolation switch power source

Examples

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Embodiment Construction

[0022] attached figure 1 , 2 , 3 is the circuit diagram of the multi-output switching power supply composed of the existing active clamp forward converter and the magnetic amplifier and the main waveform diagrams of each point. Its shortcomings have been described above and will not be repeated here.

[0023] refer to Figure 4 , the auxiliary output circuit of the magnetic amplifier of the present invention includes an auxiliary output winding Ns2, a magnetic amplifier MA, a rectifier diode D31, a freewheeling diode D32, a filter inductor L31, a filter capacitor C31 and a feedback control loop. A synchronous rectifier tube Q31 is connected in parallel with each other. The gate drive circuit of the synchronous rectifier tube Q31 includes a first triode Q33 and a second triode Q32 that are alternately switched on and off, and a magnetic amplifier MA branch is connected in series. The primary winding Na1 of the current transformer Ti is connected in series with the secondary w...

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PUM

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Abstract

This invention relates to a magnetic amplifier subsidiary output circuit for an isolation switch power supply including a subsidiary output winding, a magnetic amplifier, a commutation diode, a continuous current diode, a filter inductor, a filter condenser and a feedback control loop, among which, a rectifier is connected with both ends of the said continuous current diode in parallel, its gate drive circuit includes a first and a second triodes on-off alternatively, a current mutual-inductor first winding is serial on the said magnetic amplifier branch and its secondary winding is serial in the base emitting loop of the first triode, which detects the current signals of on-or-off of the magnetic amplifier to realize the synchronous on-or-off of a synchronous commutation tube by connecting a current mutual-inductor in a magnetic amplifier.

Description

technical field [0001] The invention relates to an isolated switching power supply circuit, in particular to a magnetic amplifier auxiliary output circuit of the isolated switching power supply. Background technique [0002] Magnetic amplifiers are widely used in auxiliary output circuits of isolated switching power supplies due to their advantages of good stability and simple control. figure 1 It is a multi-output switching power supply composed of an active clamp forward converter and a magnetic amplifier. The active clamp forward converter includes a primary circuit and a secondary circuit, and the primary circuit includes a primary power MOSFET Q11, a primary winding Np of the main transformer Tv, and an input capacitor C in and an active clamping power MOSFET Q12; the secondary side circuit includes a transformer main output winding Ns1, a rectifier tube Q21, a freewheeling tube Q22, an output inductor L21 and an output terminal capacitor C21. The magnetic amplifier c...

Claims

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Application Information

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IPC IPC(8): H02M7/00
Inventor 卢增艺李斌徐华清华桂潮
Owner YIBO POWER SUPPLY CO LTD HANGZHOU
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