7results 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 invention provides a layered lithium ion battery equalization circuit. The layered lithium ion battery equalization circuit comprises a plurality of lithium batteries connected in series, a plurality of inner-layer inductance equalization circuits connected with nodes at two ends of any two adjacent lithium batteries, and a plurality of outer-layer boost equalization circuits connected with nodes at two ends of adjacent lithium battery packs, the inner-layer inductance equalization circuit comprises an energy storage inductor and two field-effect tubes, and the two lithium batteries are controlled by the field-effect tubes to charge and discharge by utilizing the energy storage inductor, so that energy balance of the batteries is realized; the outer-layer boost equalization circuit comprises a resonant inductor, two energy storage capacitors and a plurality of field-effect tubes, and a charging loop and a discharging loop are formed through control of the field-effect tubes to achieve energy balance of the battery. The layered battery equalization technology is utilized, so that the battery energy management is facilitated, the battery pack quickly completes the energy equalization, the circuit complexity and the circuit cost are reduced, the energy consumption is avoided, and the service life of the lithium ion battery is prolonged.

This application provides a power converter and a method for controlling same. The power converter includes an output inductor, an output capacitor, a first current sampling circuit, a first-phase bridge arm, a second-phase bridge arm, a third-phase bridge arm, and a controller. A midpoint of the first-phase bridge arm is connected to a first input end of the power converter. A midpoint of the second-phase bridge arm is connected to one end of the output capacitor and a second input end of the power converter. A midpoint of the third-phase bridge arm is connected to the other end of the output capacitor through the output inductor. The one end and the other end of the output capacitor are connected to a second output end and a first output end of the power converter respectively. Both the second input end and the second output end of the power converter are connected to a neutral line. The first current sampling circuit is disposed on a connection line between the midpoint of the second-phase bridge arm and the one end of the output capacitor, and is configured to collect an inductive current of the output inductor. The controller is configured to obtain an output current of the power converter based on the inductive current of the output inductor. According to this application, circuit costs of the power converter can be reduced.

The invention provides a switch chip, a circuit system and electronic equipment, the chip comprises a grid electrode pin, a source electrode pin and a drain electrode pin, the grid electrode pin is connected with a switch control signal, the source electrode pin is connected with a power supply voltage, and the drain electrode pin is connected with a load. And the boosting module is used for boosting a difference value between the power supply voltage and the switch control signal and outputting a corresponding boosted voltage. The anti-backflow module is used for cutting off the connection between the input end and the output end of the anti-backflow module when the switch control signal is at a high level; and when the switch control signal is at a low level, connection between the input end and the output end is established. The grid electrode of the NMOS tube is connected with the output end of the anti-backflow module, the drain electrode of the NMOS tube is connected with the source electrode pin, and the source electrode of the NMOS tube is connected with the drain electrode pin; and the pull-down module is used for pulling down the grid voltage of the NMOS tube to the source voltage of the NMOS tube when the switch control signal is at a high level. According to the switch chip, the circuit cost of the chip can be reduced, and the application cost of the chip can also be reduced.

The present invention provides a method and system for optimizing the parameters of a railway transponder radio frequency circuit, which belongs to the field of rail transit transponder equipment development and testing technology. It performs equivalent analysis on components in a high-frequency circuit, extracts key characteristic variables of the circuit, establishes a multi-objective optimization model of static power consumption and circuit cost, and uses a genetic optimization algorithm to optimize the parameters of the multi-objective optimization model. The present invention takes the construction of a multi-objective optimization function as a key starting point, and implements the entire process from feature vector selection to parameter optimization output; it provides a clear way to reduce the power consumption and circuit cost of existing transponder circuits, so that the implementation of parameter optimization can adopt the idea of ​​multi-objective optimization and data-driven, avoiding the limitation of time cost; it is directly applicable to the existing transponder radio frequency transmission circuit, effectively reducing the static power consumption and circuit cost of the circuit, and is also applicable to the optimization of other parameters and objectives in the circuit.

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.