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Dual-interface smart card power source management circuit

A dual-interface smart card and power management technology, applied in the direction of electrical program control, record carrier used by machines, instruments, etc., to achieve the effect of avoiding leakage, avoiding mutual charging and discharging, and optimizing the working distance

Active Publication Date: 2011-09-28
BEIJING TONGFANG MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the prior art, there is no report of a circuit that fully satisfies the above conditions, and it is impossible to realize the basic voltage-free DC power supply under the contact / non-contact working mode and the contact / non-contact mode when both modes are powered on at the same time. loss transfer

Method used

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  • Dual-interface smart card power source management circuit

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Embodiment Construction

[0026] see Figure 1 to Figure 5 , the power management circuit of the present invention includes: three sampling units SAM1, SAM2 and SAM3 respectively used for sampling the radio frequency rectified power supply VDD_RF, the contact input power supply VCC and the internal power supply VDD; respectively used for sampling signals of the sampling units SAM1 and SAM3 And two comparator units COMP1 and COMP2 for comparing and amplifying the sampling signals of the sampling units SAM2 and SAM3; MOS transistor MP1 corresponding to the radio frequency rectification power supply VDD_RF and MOS transistor MP2 corresponding to the contact input power supply VCC. The three sampling units SAM1, SAM2 and SAM3 use exactly the same circuit, and their specific structure can adopt any one of resistor voltage divider, capacitor voltage divider, MOS transistor voltage divider or resistor and MOS transistor voltage divider circuit. The outputs of the comparator unit COMP1 and the comparator unit ...

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Abstract

The invention provides a dual-interface smart card power source management circuit which relates to the technical field of dual-interface smart card communication. The power source management circuit comprises three sampling units, two comparator units including COMP1 and COMP2, an MOS pipe MP1 corresponding to a radio frequency rectification power source VDD RF, and an MOS pipe MP2 correspondingto a contact input power source VCC, wherein the three sampling units which comprise SAM1, SAM2 and SAM3 are respectively used for sampling the radio frequency rectification power source VDD RF, the contact input power source VCC and an internal power source VDD; the COMP1 and the COMP2 are respectively used for comparing the sampling signals of sampling units SAM1 and SAM3 and the sampling signals of sampling units SAM2 and SAM3 and amplifying the sampling signals of sampling units SAM1 and SAM3 and the sampling signals of sampling units SAM2 and SAM3. Compared with the prior art, the dual-interface smart card power source management circuit can ensure that a dual-interface smart card can efficiently and reliably obtain the internal power source VDD when the contact / non-contact independent working mode and the contact / non-contact mode are simultaneously electrified.

Description

technical field [0001] The invention relates to the technical field of dual-interface smart card communication, in particular to a power management circuit for a dual-interface smart card in contact / non-contact independent working modes and contact / non-contact modes simultaneously powered on. Background technique [0002] Power management is one of the key technologies to realize contact / contactless dual-interface smart card. An ideal dual-interface smart card power management circuit needs to meet the following conditions: [0003] 1) In the non-contact single working mode, turn off the connection between the contact input power supply VCC and the internal circuit, so that the contact input power supply VCC is in a floating state, to avoid unnecessary leakage caused by the contact input power supply VCC; at the same time, the radio frequency rectifier power supply needs to be VDD_RF is delivered to the internal circuit with as little loss as possible as the DC power supply...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K19/07G05B19/04
Inventor 邰晓鹏盛敬刚霍俊杰徐磊
Owner BEIJING TONGFANG MICROELECTRONICS