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Card reader with id card function based on switch-type inductance circuit
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An inductive circuit and switching technology, applied in the field of card readers, can solve the problems of surrounding electromagnetic radiation pollution and so on
Active Publication Date: 2016-05-04
NORTHEAST AGRICULTURAL UNIVERSITY
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Description
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Problems solved by technology
[0003] In order to solve the problem that the existing card reader uses a radio frequency card, which has electromagnetic radiation pollution to the surroundings, the present invention proposes a card reader with an ID card function based on a switch-type inductive circuit
Method used
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specific Embodiment approach 1
[0094] Specific implementation mode 1. Combination figure 1 Specifically illustrate this embodiment, the card reader with ID card function based on the switch type inductance circuit described in this embodiment includes a card reader circuit 1 and an ID card circuit 2,
[0095] The card reader circuit 1 includes a current source circuit A, a measurement circuit B and a switched inductance circuit C;
[0096] The switched inductance circuit C includes a first electronic switch circuit 1-1, a second electronic switch circuit 1-2, a third electronic switch circuit 1-3, a fourth electronic switch circuit 1-4, a first diode D1, the second diode D2 and the first inductor L1;
[0097] The ID card circuit 2 includes a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, a voltage regulator tube D7, a resistor R1, a resistor R2, a resistor R3, a capacitor C1, Capacitor C2, first triode Q1, second triode Q2, microcontroller D and second inductor L2,
[0098] The po...
specific Embodiment approach 2
[0151] Embodiment 2. The difference between this embodiment and the card reader with ID card function based on the switched inductance circuit described in Embodiment 1 is that the single-chip microcomputer D adopts a 430G2553 chip.
[0152] The power consumption of the single 430G2553 chip described in this embodiment is very low. 1mW power supply can work.
specific Embodiment approach 3
[0153] Embodiment 3. The difference between this embodiment and the card reader with ID card function based on the switch-type inductance circuit described in Embodiment 1 is that the current source circuit A includes resistors R4 to R7, adjustable resistors VR1 and P-channel MOS transistor V5,
[0154] One end of the resistor R4 is simultaneously connected to one end of the resistor R7 and the positive VCC of the power supply,
[0155] The other end of the resistor R4 is simultaneously connected to one end of the resistor R6 and the adjustable end of the adjustable resistor VR1,
[0156] The fixed end of the adjustable resistor VR1 is simultaneously connected to one end of the resistor R5, the other end of the resistor R6 and the gate of the P-channel MOS transistor V5,
[0157] The other end of the resistor R5 is connected to the power ground of the power supply,
[0158] The source of the P-channel MOS transistor V5 is connected to the other end of the resistor R7,
[01...
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PUM
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Abstract
The invention discloses a card reader with an ID (identity) card function based on a switch type inductive circuit, and relates to a card reader with the ID card function based on the switch type inductive circuit, which aims at solving the problem that as an existing card reader adopts a radio frequency card, electromagnetic radiation pollution to the surroundings is caused. The card reader with the ID card function based on the switch type induction circuit has the advantages that a current source circuit is controlled by an ARM single chip microcomputer to charge and discharge a first inductor to realize the function of the card reader circuit, different from the radio frequency card, the card reader is characterized in that the ID code of the ID card circuit is identified by measuring an inductance value, and the working frequency is low; the card reader is suitable for the fields of door control systems and the like.
Description
technical field [0001] The invention relates to a card reader, in particular to a card reader with an ID card function based on a switch type inductance circuit. Background technique [0002] What the existing card reader adopts is the radio frequency card, has electromagnetic radiation pollution to the surroundings. Contents of the invention [0003] In order to solve the problem that the existing card reader adopts a radio frequency card and pollutes the surroundings with electromagnetic radiation, the present invention proposes a card reader with an ID card function based on a switch-type inductive circuit. [0004] The card reader with ID card function based on the switched inductance circuit includes a card reader circuit and an ID card circuit, [0005] The card reader circuit includes a current source circuit, a measurement circuit and a switching inductance circuit; [0006] The switchable inductance circuit includes a first electronic switch circuit, a second el...
Claims
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Application Information
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