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Switch type power supplying device with output current limit and controller

A switching power supply and switching controller technology, applied in output power conversion devices, conversion equipment with intermediate conversion to AC, control/regulation systems, etc., can solve the problem of high voltage regulation rate, unable to provide relatively stable voltage output, etc. problem, to achieve the effect of output current protection

Inactive Publication Date: 2009-12-16
NIKO SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the voltage drop of the output rectifier diode D3 varies with the load level, and the voltage of the capacitor C1 also has different effects with the conduction period of the power switch Q1, the voltage detection method of the primary side capacitor C6 cannot fully reflect the output voltage of the secondary side V O Therefore, the adjustment rate of the voltage is relatively high, and at the same time, it cannot provide a more stable voltage output.
In addition, this known primary-side feedback control switch mode power supply circuit cannot realize the output voltage V when the output reaches the current limit. O drop but the output current is still controllable and remains unchanged

Method used

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  • Switch type power supplying device with output current limit and controller
  • Switch type power supplying device with output current limit and controller
  • Switch type power supplying device with output current limit and controller

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Embodiment Construction

[0100] reference image 3 , Is a schematic diagram of a switching power supply device with output current limitation according to the first embodiment of the present invention. The switching power supply device with output current limitation includes a transformer T1, a power switch Q1, a current detector R6 and a pulse width adjustment controller U1. Among them, the primary winding P1 of the transformer T1 receives an input voltage VIN, and the secondary winding P2 of the transformer T1 induces an output voltage V O At the same time, the auxiliary winding P3 of the transformer T1 induces and outputs a feedback voltage VFB. The power switch Q1 is coupled to the primary winding P1 of the transformer T1. The current detector R6 is coupled to the power switch Q1, and receives a primary winding current I of the transformer T1 through the turned-on power switch Q1 P1 , And output a current detection signal VCS.

[0101] The pulse width adjustment controller U1 includes a feedback volta...

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Abstract

The invention relates to a switch type power supplying device with output current limit. The knee voltage of feedback voltage is obtained by a voltage sample and a retaining controller, then a square root opening operation and an error operation are respectively carried out on the knee voltage, and the action of a power switch is controlled according to operation results to achieve double functions of voltage-stabilizing output and current limit.

Description

Technical field [0001] The present invention relates to a switching power supply device with output current limit, in particular to a switch that achieves the output current protection function by controlling the current while the output voltage drops when the output reaches the current limit Type power supply device. Background technique [0002] On the market, switching power supplies have replaced linear stabilized power supplies, and the former rely on the width of a pulse to adjust and control the turn-on and turn-off time of the power switch, thereby achieving the purpose of generating a stable voltage on the secondary side. . According to the secondary side output power, the feedback signal generated by the output voltage and the output current, the pulse width adjustment controller is modulated to generate pulses of appropriate size and width. [0003] It is known that the primary-side feedback control switching power supply cannot meet the good various output voltage mod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/28H02M3/335H02M1/32
Inventor 许德贤朱允康
Owner NIKO SEMICON
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