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Supply voltage processing circuit and data carrier with supply voltage processing circuit

A data carrier and power supply voltage stabilization technology, which is applied to the record carrier used by the machine, the induction record carrier, and electrical components, etc., can solve the problems of low adjustment speed, unsatisfactory voltage regulation, and high current.

Inactive Publication Date: 2004-01-07
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another disadvantage of this parallel regulator stage is that it must draw considerable current when the data carrier feeds information to the write / read stage at very short distances apart
Therefore, it is inevitable that the adjustment speed is very low, so that the voltage regulation is not satisfactory

Method used

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  • Supply voltage processing circuit and data carrier with supply voltage processing circuit
  • Supply voltage processing circuit and data carrier with supply voltage processing circuit
  • Supply voltage processing circuit and data carrier with supply voltage processing circuit

Examples

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Embodiment Construction

[0011] figure 1 A circuit diagram of a regulated power supply is shown. A coil is connected to terminals LA and LB. The RF signal received by the coil is applied to the voltage stabilizing circuit. The voltage stabilizing circuit includes a rectification network 1 (diode D1, D6), which is preferably implemented by a MOS transistor and forms two mutually decoupled rectified voltages Ulast and Uvers from the applied AC voltage UL, and also includes a smoothing filter practical The output voltage Uvers is held by a capacitor and a voltage regulator circuit 3 . The voltage stabilizing circuit 3 includes two parallel voltage stabilizing stages, each of which has its own respective transistor driver T1 and T2 , and a voltage stabilizing amplifier stage with a reference voltage 4 . Both regulator stages operate on the principle of parallel regulation, ie the drive transistor is activated as soon as the supply voltage Uvers exceeds the allowable value derived from the reference vol...

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PUM

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Abstract

Proposed are two parallel control stages each with one transistor (T1, T2). The transistor (T2) forms part of the indirect parallel control stage and acts directly on the rectifier. It can take relatively high currents and is therefore relatively slow. The transistor (T1) forms part of the direct control stage and acts in parallel with the support capacitor. As a result of the coarse adjustment effected by transistor (T2), it is required to take only small currents and can therefore have very rapid control characteristics. Owing to the coarse adjustment effected by transistor (T2), the alternating voltage at the antenna connections (LA and LB) collapses rapidly if the HF signal is interrupted. This means that the transmission rate with pause interval modulation can be increased. Electrostatic chargings also derived from the transistor (T2), thus obviating the need for additional protective circuits.

Description

technical field [0001] The invention relates to a voltage stabilizing circuit for a power supply for a contactless, passive inductive data carrier, comprising a rectifier, a holding capacitor and a direct parallel voltage stabilizing stage connected in parallel to the holding capacitor; the invention also relates to a circuit with a Contactless, passive inductive data carrier with antenna and a voltage stabilizing circuit. Background technique [0002] Data transmission systems are known for data transmission between a generally stationary data writing / reading station and a plurality of data carriers. Such a data carrier is used as an intelligent mobile data carrier for writing or reading data in the near field of the writing / reading station. With this system, there is variety in terms of transmission range, speed of data transmission, degree of integration, storage capacity and level of intelligence of the data carrier, for various applications such as access control, indu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K19/07H04B1/59H04B5/02
CPCG06K19/0723
Inventor G·豪韦格M·考拉P·蒂林格
Owner NXP BV
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