US 10,566,973 B2Granted

Sending, receiving and transmitting apparatuses of dual-power system and fingerprint recognition system

AssigneeFocaltech Electronics, Ltd.

InventorsYunn-Hwa Wang, Kuet Liong Fam

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Abstract

Sending, receiving and transmitting apparatuses of a dual-power system and a fingerprint recognition system are provided. The dual-power system includes a first power system for providing a first high voltage signal and a first low voltage signal and a second power system for providing a second high voltage signal and a second low voltage signal, and a voltage difference between the first high voltage signal and the first low voltage signal is equal to that between the second high voltage signal and the second low voltage signal. The sending apparatus includes a first detection circuit for outputting a detection signal indicating whether voltages of the first and second low voltage signals are equal; and a first transmission circuit for transmitting an output signal of the dual-power system or provide a first voltage to an output terminal of the sending apparatus, based on the detection signal.

Claims24

Dependent claims

A sending apparatus of a dual-power system, wherein the dual-power system comprises a first power system and a second power system, the first power system is configured to provide a first high voltage signal and a first low voltage signal, the second power system is configured to provide a second high voltage signal and a second low voltage signal, and a voltage difference between the first high voltage signal and the first low voltage signal is equal to that between the second high voltage signal and the second low voltage signal, and

wherein the sending apparatus comprises:
a first detection circuit, configured to output a detection signal, wherein the detection signal indicates whether a voltage of the first low voltage signal is equal to that of the second low voltage signal, or whether a voltage of the first high voltage signal is equal to that of the second high voltage signal;
and
a first transmission circuit, configured to transmit an output signal of the dual-power system to an output terminal of the sending apparatus or provide a first voltage to the output terminal of the sending apparatus, based on the detection signal.

1 more element

A receiving apparatus of a dual-power system, wherein the dual-power system comprises a first power system and a second power system, the first power system is configured to provide a first high voltage signal and a first low voltage signal, the second power system is configured to provide a second high voltage signal and a second low voltage signal, and a voltage difference between the first high voltage signal and the first low voltage signal is equal to that between the second high voltage signal and the second low voltage signal, and

wherein the receiving apparatus comprises:
a second detection circuit, configured to output a detection signal, wherein the detection signal indicates whether a voltage of the first low voltage signal is equal to that of the second low voltage signal, or whether a voltage of the first high voltage signal is equal to that of the second high voltage signal;
and
a second transmission circuit, configured to transmit an input signal of the dual-power system to an output terminal of the receiving apparatus or provide a second voltage to the output terminal of the receiving apparatus, based on the detection signal.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 15/661,619Filed 27 Jul 2017
Priority: CN 2016 1 06392365 Aug 2016
Published: US 2018/0041211 A18 Feb 2018
Granted: 18 Feb 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

H03K 19/0027
Modifications of threshold: in field effect transistor circuits
G01R 19/10
Arrangements for measuring currents or voltages or for indicating presence or sign thereof: measuring sum, difference or ratio
G06V 40/1329
Sensors therefor: protecting the fingerprint sensor against damage caused by the finger
H03K 19/0948
Using MOSFET or insulated gate field-effect transistors, i.e. IGFET: using CMOS or complementary insulated gate field-effect transistors