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A Voltage Detector Realizing CP Test

A voltage detector and testing circuit technology, applied in the direction of measuring current/voltage, measuring electrical variables, electronic circuit testing, etc., can solve the problems of increasing test time and cost, and achieve the effect of saving time cost, reducing requirements and reducing complexity

Active Publication Date: 2018-09-04
DATANG MICROELECTRONICS TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the current method of testing the voltage detector by changing the voltage needs to set the external voltage four times to be able to measure the range of the high and low voltage alarm points of the voltage detector, resulting in increased test time costs

Method used

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  • A Voltage Detector Realizing CP Test
  • A Voltage Detector Realizing CP Test
  • A Voltage Detector Realizing CP Test

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Embodiment Construction

[0024] In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

[0025] The steps shown in the flowcharts of the figures may be performed in a computer system, such as a set of computer-executable instructions. Also, although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in an order different from that shown or described herein.

[0026] The embodiment of the present invention provides a high-efficiency voltage detector CP test scheme. With the cooperation of the smart card system, the high and low voltage alarm points of the voltage detector can be tested at the same voltage at the...

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Abstract

The embodiment of the invention provides a voltage detector for CP testing. The voltage detector comprises a sensor circuit, a judging circuit and a logic circuit, wherein the sensor circuit is used for sensing power voltage of an intelligent card and transmitting the power voltage to the judging circuit, the judging circuit is composed of a comparator and used for comparing the power voltage transmitted by the sensor circuit with a reference voltage and converting the analog signal comparison result into the digital signal comparison result, and the logic circuit is used for conducting CP testing of the voltage detector according to the comparison result transmitted by the judging circuit and outputting an alarm signal when the comparison result is not within a preset tolerance range. A high-voltage alarm point and a low-voltage alarm point are tested at the same time under one voltage.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of testing, and in particular, to a voltage detector for implementing CP testing. Background technique [0002] The voltage detector can effectively protect the smart card from the attack of the external input voltage. Generally, a smart card will have an operating voltage range according to application requirements. When the voltage exceeds this range, the voltage detector will generate an alarm signal. This alarm voltage is called the high and low voltage alarm point. In this way, due to the existence of the voltage detector, the smart card will not work under the voltage which is too high or too low. [0003] When designing, the alarm point of the voltage detector cannot be within the normal tolerance range of the smart card, but it cannot be far away from the operating boundary. Farther away from the border, there is a larger risk window. When the voltage is in this window, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/165G01R31/28
CPCG01R19/165G01R31/28
Inventor 闫志光孔阳阳杨敬张祥杉
Owner DATANG MICROELECTRONICS TECH CO LTD