Power source management circuit of double-interface IC card

Abstract

The invention provides a power source management circuit of a double-interface IC card. The circuit comprises a transmission tube used for introducing a non-contact power source under the control of a contact power source, a first level restorer used for processing a signal of the non-contact power source introduced by the transmission tube and outputting the signal after processing, a second level restorer used for introducing the contact power source and processing a signal of the contact power source and outputting the signal after processing under the control of the non-contact power source, and a power source selector which is separately connected with an output end of the transmission tube and the contact power source and is used for outputting the non-contact power source through the transmission tube and the first level restorer when the non-contact power source is powered on, outputting the contact power source through the second level restorer when the contact power source is powered on, and outputting the contact power source through the second level restorer when the contact power source and the non-contact power source are simultaneously powered on. Through the power source management circuit, management and distribution of double-interface power sources of the double-interface IC card including the contact power source and the non-contact power source are realized, and the circuit is guaranteed to have no voltage drop.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a power management circuit of a dual-interface IC card. Background technique [0002] The dual-interface card integrates the features of contact card and contactless card, so that the dual-interface card can be used in banking, communication, medical care, transportation, education and other fields, bringing great convenience to users. The dual-interface card has two interface power supplies, the contactless power supply and the contact power supply. Therefore, there should be a power management circuit to correctly control the switching of the two interface power supplies and control the voltage drop within a certain range. [0003] In the prior art, the power management circuit has a voltage difference between the external contact / non-contact power supply and the internal power supply, even if some designs use special low-threshold MOS tubes instead of ordinar...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the power management circuit has a voltage difference between the external contact / non-contact power supply and the internal power supply, even if some designs use special low-threshold MOS tubes instead of ordinary MOS tubes to reduce this This kind of voltage difference does not completely eliminate the voltage difference, and such a special low-threshold MOS tube increases the complexity of the process

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