Switching power supply

A technology of switching power supply and switching elements, which is applied in the direction of electrical components, adjusting electric variables, instruments, etc., can solve the problem of non-existing reverse mode, and achieve the effect of preventing damage and stabilizing negative voltage output

Inactive Publication Date: 2010-09-08
THINE ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

) switching power supply circuit, but there is no inversion mode that is improved to output negative voltage (also known as "Inverting Mode")

Method used

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  • Switching power supply
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Examples

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Embodiment Construction

[0047] In this embodiment mode, an example of the switching power supply of the present invention will be described. The switching power supply shown in Figure 1 adopts the inverting mode (Inverting Mode) that outputs a negative voltage, and outputs the reference voltage input to the error amplifier from the soft-start circuit. Therefore, the feedback function in the circuit can be activated immediately after the power supply is started, and the overshoot on the negative side of the negative voltage output when the power supply is started can be prevented, and the damage to the circuit elements on the load side outputting the negative voltage can be eliminated.

[0048] FIG. 1 shows a circuit diagram of a switching power supply (switching circuit) 100 . The switching power supply (switching circuit) 100 includes a soft start circuit 101, a triangular wave generating circuit 102, an error amplifier (error amplifier circuit) 103, a comparator (comparison circuit) 104, a drive un...

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PUM

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Abstract

The invention provides a switching power source having a stable negative voltage output. The switching power source is characterized by comprising a switching power source controller having a soft start circuit, an output stage including a coil, a switching element for controlling an electric current to flow through the coil by driving the coil with the switching power source controller, and a diode having its anode side connected with the output end and its cathode side connected with the node between the switching element and the coil, a voltage dividing circuit for dividing the output voltage of the soft start circuit and the voltage of the output end, and a soft start period adjusting circuit for adjusting the soft start period.

Description

technical field [0001] The present invention relates to switching power supplies. In particular, it relates to a switching power supply provided with a soft start circuit, which switches the current flowing to the coil and outputs a predetermined negative voltage to the output side. Background technique [0002] Conventionally, soft-start circuits have been used in switching power supplies to prevent damage or malfunction of ICs, which are loads of switching transistors and switching power supplies, due to inrush current for charging output capacitors at startup. [0003] Here, refer to FIG. 14 . FIG. 14 shows a circuit example of a positive voltage output switching power supply 1000 in step-down mode (a mode in which the relationship of power supply voltage (Vcc)>output voltage (Vo) is also called "Buck Mode"). A conventional switching power supply 1000 shown in FIG. 14 includes a soft start circuit 1001, a triangular wave generating circuit 1002, an error amplifier 10...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/155
CPCH02M1/36H02M3/156
Inventor 松垣佳克吉田雅房
Owner THINE ELECTRONICS
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