Proximity sensor, RFID card reader and proximity sensing method

A proximity sensor and card reader technology, applied in the field of proximity sensor, RFID card reader and proximity sensing, can solve the problems of frequent battery replacement, sensitive power consumption, user inconvenience, etc., to achieve ultra-low power consumption and prolong service life , the effect of reducing workload

Active Publication Date: 2016-03-16
GUANGDONG PLANNING & DESIGNING INST OF TELECOMM
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The battery is more sensitive to power consumption due to its limited power, and the high power consumption leads to frequent battery replacement, which brings great inconvenience to users

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
  • Proximity sensor, RFID card reader and proximity sensing method
  • Proximity sensor, RFID card reader and proximity sensing method
  • Proximity sensor, RFID card reader and proximity sensing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Proximity sensors of the present invention, such as figure 1 shown, including:

[0026] The ambient illumination detection module is used to detect whether the ambient illumination is higher than a threshold;

[0027] The power distribution control module is used to control the photosensitive unit to be powered on and the infrared unit to be powered off when the ambient illuminance is higher than the threshold, and to control the infrared unit to be powered on and the photosensitive unit to be powered off when the ambient illuminance is lower than or equal to the threshold ;

[0028] The photosensitive unit is used to detect the light change, and generate a pulse signal when the light change reaches a predetermined value;

[0029] The infrared unit is used for periodically emitting infrared rays and receiving infrared rays, and generating pulse signals when receiving infrared rays.

[0030] As mentioned above, the proximity sensor has two working modes, one is photos...

Embodiment 2

[0033] In this example, if figure 2 As shown, the photosensitive unit includes a photosensitive detection circuit connected in sequence, a power frequency chopper filter, a pre-high-pass amplifier circuit and an adaptive pulse generation circuit, and an operational amplifier half-voltage generator and a white noise suppression circuit. The half voltage generator is connected with the pre-high-pass amplifier circuit, and the white noise suppression circuit is connected with the adaptive pulse detection circuit.

[0034] The resistance value of the photoresistor in the photosensitive detection circuit changes as the light changes, thereby causing a voltage change, and the subsequent circuit can identify the card swiping action according to the voltage change. Since the photoresistor is sensitive to visible light, and most lighting lamps use a 50Hz power frequency power supply, the photoresistor will generate a 50Hz electrical interference signal. The power frequency chopper fi...

Embodiment 3

[0040] In this example, if figure 2 As shown, the infrared unit includes an asymmetric signal generator, an infrared transmitting circuit, an infrared receiving circuit, an adaptive white noise elimination circuit and a pulse generating circuit connected in sequence.

[0041] The asymmetrical signal generator is used to generate the infrared signal, which is composed of CMOSICM555. In order to save energy, the gap transmission method of transmitting infrared signals every 50ms is adopted. The high level is 0.1ms, the low level is 50ms, and the duty ratio is 500:1, which can greatly reduce power consumption. At the same time, since it takes 300-400ms for ordinary people to swipe their cards, the transmission interval of 50ms is also to make the user experience good without feeling delayed.

[0042]The operating voltage of the infrared emission circuit is 3-4.5 volts, and the operating voltage of the infrared emission tube is 1.2-1.6 volts. In order to keep the infrared emissi...

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 discloses a proximity sensor and a proximity sensing method. When illumination is proper, a low-power-consumption photosensitive detection method is adopted to detect card swiping motion, and when illumination is low, an infrared detection method is started to detect the card swiping motion. The fact that the card swiping motion can be detected under any illumination conditions is ensured, and the requirement of super-low power consumption can be met. The proximity sensor is matched with a traditional radio frequency identification (RFID) card reader to be used, an RFID card reader is formed, the RFID card reader is converted to a working state when the card swiping motion is detected, and the RFID card reader is in a sleep sate at ordinary times. Therefore, power consumption is lowered, the service life of a battery is prolonged, and work loads caused by replacement of the battery are reduced. The proximity sensor, the RFID card reader and the proximity sensing method are popularized and used, and tremendous contributions are made to domestic energy conservation and emission reduction.

Description

technical field [0001] The invention relates to the technical field of radio frequency identification, in particular to a proximity sensor, an RFID card reader and a proximity sensing method. Background technique [0002] RFID (Radio Frequency Identification) is a radio frequency identification technology, the RFID card reader and RFID tag using this technology use radio frequency signals to transmit information. RFID tags, also known as ID / IC cards, are divided into passive ID / IC cards, semi-active ID / IC cards and active ID / IC cards. Among them, the development of passive ID / IC card is the earliest and the most mature. Because of its mobility and portability, it is widely used in the market. For example, bus cards, bank cards, canteen meal cards, hotel access cards, second-generation ID cards, etc. [0003] Passive ID / IC cards have no power supply and must rely on the electromagnetic field emitted by the RFID card reader to obtain energy. Since it is unpredictable when t...

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
Patent Type & Authority Patents(China)
IPC IPC(8): G06K7/00
Inventor 严益强
Owner GUANGDONG PLANNING & DESIGNING INST OF TELECOMM
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