3results about How to "Reduce circuit cost" patented technology

This invention discloses an interface anomaly detection circuit and a charger. The interface anomaly detection circuit includes: a pull-up module connected between a voltage source and a configuration signal line; a pull-down module connected between the configuration signal line and a reference ground; a control module configured to control the on / off state of a first loop between the pull-up module and the configuration signal line, control the on / off state of a second loop between the pull-down module and the configuration signal line, and output a first switching signal or a second switching signal; and a detection module for acquiring a sampled voltage of the configuration signal line and, in response to the first switching signal or the second switching signal, determining whether parasitic capacitance or short-circuit resistance caused by moisture intrusion exists on the configuration signal line based on the sampled voltage. Through this method, this invention can reliably detect interface moisture intrusion at a low circuit cost and avoids altering the interface structure to affect signal transmission.

The application provides an ultrasonic fingerprint readout circuit, an ultrasonic fingerprint chip and an ultrasonic fingerprint module. The ultrasonic fingerprint readout circuit comprises a sensing circuit, a single-ended-to-dual-ended circuit and a bidirectional integration circuit which are coupled in sequence. Compared with a conventional ultrasonic fingerprint readout circuit, two noise sources are saved, bidirectional integration (integration from a wave peak to a wave trough and from a wave trough to a wave peak) is realized through a differential working mode, the output signal quantity is doubled, the output noise is reduced, the signal-to-noise ratio is greatly improved, the anti-interference capability is better, and the additional circuit cost is not increased too much.

The present disclosure provides a power supply system comprising: a transformer having a primary winding and a plurality of secondary windings; the first power supply device is electrically connected between the corresponding secondary winding and the power element and is used for supplying power to the power element; and the second power supply device is electrically connected between the corresponding secondary winding and the energy storage element, comprises a charging unit and an energy feedback unit, and can select the charging unit or the energy feedback unit to charge the energy storage element or select the energy feedback unit to discharge the energy storage element based on the voltage and state of the energy storage element. The power supply system provided by the invention not only can provide various charging modes for the energy storage element, but also can feed the electric energy of the energy storage element back to a power grid or supply power to power elements of other branches.