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Switching IC with built-in photosensitive element

A photosensitive element and switching conversion technology, which is applied in the direction of electrical components, DC power input conversion to DC power output, AC power input conversion to DC power output, etc., can solve the problem of excessive physical size of optocoupler IC

Inactive Publication Date: 2016-08-03
MOSWAY SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, the physical size of optocoupler ICs is often considered oversized for current product trends towards space minimization

Method used

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  • Switching IC with built-in photosensitive element
  • Switching IC with built-in photosensitive element
  • Switching IC with built-in photosensitive element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0033] in the attached figure 2 A preferred embodiment of a CMOS switch controlling a photodiode and bonding circuitry within an N-type substrate is schematically illustrated in . In this figure, the photodiode is composed of P + and N-substrates. N-substrate is usually connected to V dd (maximum positive supply voltage). The junction reverse current I through this photodiode R monotonically increases with light intensity. bipolar transistor T1 to I R Amplify, and the current mirror composed of NFET-1 and NFET-2 further amplifies the current with the channel width ratio to generate the final feedback current I FB . image 3 yes figure 2 the equivalent circuit.

[0034] It should be noted that the transistor T1 for current amplification and the current amplifier formed by NFET-1 and NFET-2 generate the final feedback current I FB And significantly reduce the current output by the photodiode. Therefore, the IC area is reduced. In addition, the phototransistor insid...

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PUM

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Abstract

The invention relates to a switch transformation IC (Integrated Circuit), and particularly but not exclusively relates to a switch transformation IC (Integrated Circuit) with a built-in photosensitive element. The switch transformation IC comprises a switch transformation circuit and an integrated photosensitive element, wherein the integrated photosensitive element is used for controlling the feedback to the switch transformation circuit. The demand on independent pins for periphery equipment for receiving feedback control information from external photosensitive elements is eliminated.

Description

technical field [0001] The invention relates to a switching converter. More particularly but not exclusively, the present invention relates to a switching IC with a built-in photosensitive element. Typically, such converters are used to generate a DC supply voltage from the AC mains used to power electronic circuits. Background technique [0002] An AC-DC switching converter IC implemented on the primary side of a transformer without built-in power switching devices usually has the following functional pins: [0003] (a)V DD , which is used for the positive supply connection; [0004] (b)V SS , which is used for the negative supply connection, or vice versa; [0005] (c) FB, which is a feedback information connection for receiving error information from the secondary side, adjusts the duty cycle of the main switching device according to the information received at this pin; and [0006] (d) DR, which is a driving source for controlling the switching duty ratio of the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M7/162
Inventor 谢潮声陈安邦李植荫邓志强黄艺华
Owner MOSWAY SEMICON