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Power supply circuit

A technology of power supply circuit and voltage conversion circuit, which is applied in the direction of electrical components, adjusting electric variables, instruments, etc., can solve the problems of the output voltage drop of the series voltage regulator, the output voltage drop of the charge pump 10, etc., to prevent large current and prevent failure The effect of affecting and preventing the generation of large current

Inactive Publication Date: 2005-06-15
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, a large current flows, and the output voltage of the charge pump 10 drops significantly.
Moreover, the output voltage (output 2) of the series regulator 14 also drops significantly due to this

Method used

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Embodiment Construction

[0047] Embodiments of the present invention will be described below with reference to the drawings.

[0048] Figure 10 It is a figure which shows an example of a structure of embodiment. A series regulator 12 is connected to the output of the charge pump 10 . Furthermore, a charge pump output voltage monitoring circuit 20 for monitoring the output of the charge pump 10 is provided, and the charge pump output voltage monitoring circuit 20 controls the operation of the series regulator 12 . That is, the charge pump output voltage monitoring circuit 20 controls the operation of the series regulator 12 and limits its current when the output voltage of the charge pump drops below a predetermined value, so that the output voltage of the charge pump 10 hardly fluctuates.

[0049] In this way, the current flowing from the charge pump 10 into the series regulator 12 becomes larger, and when the output voltage of the charge pump 10 drops lower than the set voltage, the current flowin...

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PUM

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Abstract

The present invention provides a power supply circuit capable of stabilizing the output of a charge pump. The output voltage of the charge pump (10) is monitored by a charge pump output voltage monitoring circuit (20). When the output voltage of the charge pump (10) falls below a predetermined value, the operating current of the series regulator (12) is limited.

Description

technical field [0001] The present invention relates to a power supply circuit that outputs an output from a charge pump via a plurality of voltage conversion circuits. Background technique [0002] Conventionally, a voltage different from that of a power supply is sometimes required in various circuits. For example, in a semiconductor integrated circuit (LSI, IC, etc.) that operates on battery power, a higher voltage than battery power is required, or a negative power supply is required to secure a dynamic range. In this case, a switching regulator can be used. This switching regulator is a circuit that uses a coil to step up (or step down) a voltage, so that a desired voltage can be obtained. [0003] On the one hand, currently, a charge pump is widely used to replace the switching regulator. This charge pump is a circuit that shifts the voltage charged by the capacitor to obtain a desired voltage. [0004] figure 1 An example of a charge pump is shown in . In this e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/07G05F1/10
CPCH02M3/07H02M1/0045H02M1/009
Inventor 大高信行
Owner SANYO ELECTRIC CO LTD