Switched mode power supply comprising function for recognition of broken feedback loop

A switching power supply, power supply voltage technology, applied in the output power conversion device, electrical components, regulating electrical variables and other directions, can solve problems such as switching power supply damage

Inactive Publication Date: 2003-09-10
INFINEON TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since it is impossible to distinguish whether the feedback branch is broken or the output voltage driving the phone is zero, if the energy transfer to the secondary side is maximum when the feedback branch is broken, then some parts of the switched mode power supply are blocked. risk of damage

Method used

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Effect test

Embodiment Construction

[0022] figure 1 A block diagram of one embodiment of the switching mode power supply of the present invention is given. figure 2 A detailed description of the switching power supply drive circuit IC is given. The illustrated switched-mode power supply has outputs EK1 , EK2 , which are supplied by the input voltage Vin. The input voltage Vin used is usually a variable voltage ranging from 85V to 270V. The input terminals EK1 and EK2 are followed by a bridge rectifier BG composed of four diodes, and the bridge rectifier BG is followed by a capacitor Cg. The bridge rectifier BG and the capacitor Cg utilize the variable input voltage Vin to generate a rectified voltage Vg across the capacitor Cg.

[0023] In this switching power supply, there is also a transformer with a primary coil L1 and a secondary coil L2, and a series circuit of the primary coil L1 and a switching element TS, which may be a semiconductor power switch connected in parallel with a capacitor Cg. The switch...

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PUM

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Abstract

The invention relates to a switched mode power supply with the following features: a primary coil (L1) and a switch element (TS) wired in series with the primary coil (L1), for applying a DC voltage (Vg) to the primary coil according to a control signal (AI); a secondary circuit, coupled to the primary coil (L1) with output terminals (AK1, AK2) to provide an output voltage (Vout); a control circuit (IC), for preparation of the control signal (AI), with a feedback signal (Urk) dependent on the output voltage (Vout) supplied to the control circuit; the control circuit (IC) comprises a signal generation circuit (PWM) to create the control signal (AI) and a protection circuit (PUS). Said protection circuit (PUS) has the effect that no control signal (AI) is delivered to the switch element (TS), if the feedback signal (Urk) reaches the value of a first reference signal (U1) after a first period (T3) after starting the control circuit (IC).

Description

field of invention [0001] The present invention relates to switched mode power supplies. Background technique [0002] A switching power supply usually has a transformer. The transformer includes a primary coil, a secondary coil, and a switching element. The switching element can be a semiconductor power switch connected in series with the primary coil, which provides DC voltage to the primary coil in a switching manner according to the driving signal. When the switching element is closed, energy is dissipated in the primary coil, which is transferred to the secondary coil when the switch is subsequently opened. The secondary coil is part of the secondary circuit which has an output terminal for connection to a load. The load is powered by the output voltage at the output. The purpose of this arrangement is to keep the output voltage basically constant when the load changes, and to change the DC voltage of the primary coil. To this end, a controlled system is added to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/00H02M1/32H02M3/335
CPCH02M3/33523H02M1/32
Inventor M·法伦卡普H·贾斯伯格M·菲尔德科尔勒H·佐伊林格
Owner INFINEON TECH AG
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