Ling intensity detection method and light intensity detection circuit

A technology of light intensity detection and light detection, applied in the field of electronics, can solve the problems of multiple power consumption, consumption, large chip area, etc., and achieve the effect of being conducive to miniaturization, simplifying circuit structure, and reducing chip area

Active Publication Date: 2012-01-25
NATIONZ TECH INC
View PDF5 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1) Using the method of current comparison to detect light intensity requires more reference current options, sacrifices more power consumption, and the implementation of the control circuit is more complicated;
[0005] 2) The method of converting current to voltage is used to detect light intensity. Since the current generated by light induction is relatively small, to generate a l...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Ling intensity detection method and light intensity detection circuit
  • Ling intensity detection method and light intensity detection circuit
  • Ling intensity detection method and light intensity detection circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0046] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0047] The main idea of ​​the present invention is that by amplifying the photo-generated current generated by the photodiode, using the photo-generated current to indirectly control the bias current of the oscillator OSC, so that the change of the photo-generated current is converted into the frequency change of the oscillator OSC output, so only It is necessary to detect the change of the output frequency of the oscillator OSC to detect the intensity of light. This method is relatively simple, avoids complex ADC detection circuits, and reduces the demand for chip area and power consumption.

[0048] figure 2 It is a functional block diagram of the light intensity detection circuit in the embodiment of the presen...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a light intensity detection method and a light intensity detection circuit. According to the method, photo-generated current generated by a photographic module is amplified and is used for controlling the frequency of an oscillator, thereby the change of the photo-generated current is converted into change of the output frequency of the oscillator; and the strength of light can be detected by only detecting the output frequency of the oscillator, so that the light intensity can be detected more simply and conveniently. In addition, the light intensity detection circuit adopting the light intensity detection method comprises the photo-generated module, a current amplifying and comparing module and the oscillator; and the circuit has the advantages of more simplified structure, reduced power consumption and reduced chip area occupied by the circuit.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a light intensity detection method and a light intensity detection circuit. Background technique [0002] The current smart card or dual-interface card has been developed more and more rapidly. For safety considerations, light detection is also required. Portable products also need to detect the intensity of light in order to save power on the display screen. There are two types of current light intensity detection implementation schemes: one is to use a photodiode to detect the light signal, generate a current, and detect the light intensity through a current comparison method; the other is to use a photodiode to detect the light signal and generate a current. Light intensity is detected by converting a current through a resistor into a voltage. figure 1 It is a light intensity detection circuit in the prior art. Such as figure 1 As shown, the light intensity detection circuit inc...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01J1/18
Inventor 石道林
Owner NATIONZ TECH INC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap