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Control circuit for switching power supply device and switching power supply device used therewith

A technology for controlling circuits and switching power supplies, which is applied in control/regulation systems, output power conversion devices, electrical components, etc., and can solve problems such as current increase

Inactive Publication Date: 2003-10-15
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the output capacitor connected to the output terminal of the switching power supply device is omitted or has a small capacity, the current flowing through the output capacitor connected to the corresponding load will increase significantly

Method used

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  • Control circuit for switching power supply device and switching power supply device used therewith
  • Control circuit for switching power supply device and switching power supply device used therewith
  • Control circuit for switching power supply device and switching power supply device used therewith

Examples

Experimental program
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Embodiment Construction

[0033] Fig. 1 shows the circuit diagram of the switching power supply device of the preferred embodiment of the present invention.

[0034] As shown in FIG. 1, the structure of the switching power supply device according to this embodiment reduces the input voltage Vin supplied to the input power supply terminal 1, thereby generating an output voltage V0, and then supplies the generated output voltage V0 to the output power supply terminal 2, and the switching power supply device It includes an input capacitor 3 , a main circuit part 10 and a control circuit 20 .

[0035] Two DC loads 31 and 32 are connected to the output power terminal 2 . An output capacitor C31 is provided near the power supply terminal 31a of the load 31, and an output capacitor C32 is provided near the power supply terminal 32a of the load 32.

[0036] As further shown in FIG. 1 , a parasitic inductance element L31 exists between the branch point A and the output capacitor C31 , and a parasitic inductanc...

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PUM

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Abstract

The present invention relates to a control circuit for a switching power supply device that is adapted to drive two or more loads and can quickly eliminate a voltage difference occurring between the two or more loads. The control circuit for a switching power supply device has an output terminal that is to be connected to a power supply terminal of a first load by a first wiring and a power supply terminal of a second load by a second wiring. The control circuit comprises a first control loop for stabilizing an output voltage appearing at the output terminal and a second control loop for eliminating a difference between a first voltage appearing at the first wiring in a vicinity of the power supply terminal of the first load and a second voltage appearing at the second wiring in a vicinity of the power supply terminal of the second load.

Description

technical field [0001] The invention relates to a control circuit of a switching power supply device and a switching power supply device using the control circuit, in particular to a control circuit of a switching power supply device supplying power to two or more loads and a switch power supply device using the control circuit. Background technique [0002] Conventional switching power supply devices are used in various products such as computers, home appliances, automobiles and the like. A typical switching power supply device includes a DC / DC converter, which uses a switching circuit to convert a DC input voltage to an AC current, and then uses an output circuit to convert the AC current to a DC current, thereby generating a DC output voltage that is different from the input voltage level. [0003] In such a switching power supply device, an output voltage is detected by a control circuit, and based on the detected output voltage, the switching circuit controls switching...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155H02M3/157
CPCH02M2001/009H02M3/157H02M1/009
Inventor 上松武
Owner TDK CORPARATION