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Switch supply source

A switching power supply and circuit technology, applied in electrical components, regulating electrical variables, high-efficiency power electronic conversion, etc., can solve problems such as fluctuation and output voltage Vout undershoot, and achieve the effect of reducing costs, improving reliability, and avoiding failures

Inactive Publication Date: 2006-07-12
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0032] As explained above, the conventional switching power supply has two main problems: one problem is that the output voltage Vout gradually decreases while fluctuating over a very long cycle time when an instruction to stop the operation of the switching power supply is issued; Undershoot occurs in the output voltage Vout when an instruction to stop the operation of the switching power supply is issued

Method used

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Embodiment Construction

[0069] Preferred embodiments of the present invention are explained in detail with reference to the accompanying drawings.

[0070] attached figure 1 Shown is a circuit diagram of a switching power supply as a preferred embodiment of the present invention.

[0071] as attached figure 1 As shown, the switching power supply of this embodiment can reduce the DC (direct current) input voltage Vin supplied to a pair of input power terminals 41 and 42 to generate a DC output voltage Vout between a pair of output power terminals 43 and 44 and transfer the The DC output voltage Vout is supplied to the load. The switching power supply of the present embodiment consists of a chopper converter circuit 50 connected to the input power terminals 41 and 42, a half-bridge converter circuit 60 connected to the chopper converter circuit 50 to excite the primary coil Lp11 of the transformer T2, a control chopper The chopper converter control circuit 71 of the converter circuit 50, the half-br...

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PUM

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Abstract

A switching power supply which can prevent the output voltage Vout from fluctuating or undershooting when the instruction for stopping the operation is issued is disclosed. A switching power supply according to the present invention employs a transformer having a primary coil and a secondary coil, a switching circuit connected between an input terminal and the primary coil of the transformer, a rectifier connected to the secondary coil of the transformer, a smoothing circuit located at a subsequent stage of the rectifier and including an output capacitor, a control circuit controlling the switching circuit, and an operating voltage generating circuit, responsive to an instruction for stopping a switching operation, for supplying an operating voltage to the control circuit using at least energy stored in the output capacitor. Thus, the switching power supply of the present invention can substantially linearly lower the output voltage Vout.

Description

technical field [0001] The present invention relates to a switching power supply, and more particularly, to a switching power supply capable of preventing undershoot and fluctuation of an output voltage Vout when the operation of the switching power supply is stopped. Background technique [0002] Switching power supplies are widely used as power supplies for electronic and electrical equipment such as computers. [0003] Accompanying drawing 7 shows the circuit diagram of conventional switching power supply. [0004] As shown in FIG. 7, a conventional switching power supply consists of a transformer T1, a switching circuit on the primary side of the transformer T1, and a self-driven rectifier and filter circuit on the secondary side of the transformer T1. The switching power supply reduces a DC (direct current) input voltage in a voltage Vin supplied to a switching circuit on a primary side to generate a DC output voltage Vout and supplies it to a load. In FIG. 7, the loa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/28H02M3/335H02M3/337
CPCH02M3/28H02M1/36H02M3/33592H02M3/3376H02M2001/0006H02M2001/007Y02B70/1475Y02B70/10H02M1/0006H02M1/007
Inventor 八田昌治畠山治彥渡边正人
Owner TDK CORPARATION
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