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Bipolar supply voltage generator and its semiconductor device

一种电源电压、发生器的技术，应用在电气元件、仪器、调节电变量等方向，能够解决耗费空间、很难减小便携式电子设备尺寸、很难减小电感器物理尺寸等问题

Inactive Publication Date: 2003-07-16
CYPRESS SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, it is difficult to reduce the physical size of an inductor, unlike a capacitor
Conventional bipolar supply voltage generators use at least two such space-consuming components, which makes it difficult to reduce the size of portable electronic devices mentioned in the first part of the specification

Method used

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  • Bipolar supply voltage generator and its semiconductor device
  • Bipolar supply voltage generator and its semiconductor device
  • Bipolar supply voltage generator and its semiconductor device

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Experimental program
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Effect test

no. 1 approach

[0038] According to a first embodiment, the above-mentioned bipolar supply voltage generator works as follows. First, controller 15 turns on switches 13 and 14 , causing current to flow into inductor 10 from unipolar power supply 16 . This is the beginning of what we call the "first process" here. In the first process, the given circuit should produce a positive output voltage. (As will be described later, we also have a "secondary process" in which negative output voltages are produced.)

[0039] Inductor current—which is electrical energy—generates a magnetic field in the inductor 10, so that the inductor 10 stores a certain amount of energy in magnetic form. After a predetermined time elapses (this time cannot be too long, at least the magnetic energy in the inductor should reach a saturation value), the controller 15 turns off the first switch 13 . This results in a disconnect between the inductor 10 and ground, causing the inductor 10 to reduce its current flow. As th...

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PUM

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Abstract

A reduced-size bipolar supply voltage generator which produces a positive and negative voltages from a unipolar power source. A single inductor is employed for current switching operation, where electric energy supplied from a power source is stored in magnetic form, and the stored magnetic energy is released as electric energy. A first and second diodes are connected to first and second ends of the inductor, respectively. The inductor is grounded at the first end via a first switch, while its second end is connected to the power source via a second switch. A switching controller activates both switches to energize the inductor. It then deactivates the first switch alone, thus directing the inductor's energy to the positive voltage output through the first diode. The controller may turn off the second switch alone after energizing the inductor. The stored energy now appears at the negative voltage output through the second diode.

Description

technical field [0001] The invention relates to bipolar supply voltage generators and semiconductor devices therefor. More particularly, the present invention relates to a bipolar supply voltage generator that generates positive and negative supply voltages from a unipolar supply, and a semiconductor device used in the bipolar supply voltage generator. Background technique [0002] Today, many portable data processing devices, including mobile phones and personal digital / data assistants (PDAs), have liquid crystal displays (LCDs). Since LCDs use both positive and negative voltages, bipolar power supply circuits are incorporated into those devices to generate the above-mentioned required voltages from a single voltage power source such as a secondary battery pack. [0003] Fig. 12 shows a typical structure of a conventional bipolar supply voltage generator. The circuit shown includes the following elements: input capacitor Cin, pulse generators PG1 and PG2, inductors L1 and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155H02M3/158G05F1/00H02M3/00
CPCH02M2001/009H02M3/1582H02M1/009
Inventor 土屋主税韮塚公利西森英二大津勝吉
Owner CYPRESS SEMICON CORP
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