4results about How to "Implement overvoltage protection" patented technology

This application relates to the field of charging technologies and discloses a charging circuit, a charging control method, and an electronic device, to perform overvoltage protection on a charging circuit in an electronic device. The charging circuit includes a first power supply terminal, a second power supply terminal, a controller, a first switch, a second switch, a first charging chip, and a second charging chip. The second charging chip supports a fast charging protocol. The first power supply terminal is coupled to the first charging chip through the first switch and coupled to the second charging chip through the second switch, and the first power supply terminal is configured to be coupled to a charger. The first charging chip and the second charging chip are further coupled to the second power supply terminal, to be coupled to a battery. The first charging chip is coupled to a communication terminal of the charger. The first charging chip communicates with the charger to determine that the charger supports the fast charging protocol. The controller controls the first switch to open and the second switch to close, and controls the first charging chip to obtain power from the battery. The first charging chip controls the charger to increase a charging voltage, to fast charge the battery.

The application relates to a circuit for preventing high-voltage external connection of a transmitter output. The circuit comprises a first input end of the circuit for connecting a first output end of an input structure, a second input end of the circuit for connecting a second output end of the input structure, a third input end of the circuit for connecting a first end of a transmitter output structure, a first output end of the circuit for connecting a second end of the transmitter output structure, and a second output end of the circuit for connecting a third end of the transmitter output structure. The circuit can feed back a high-voltage external connection control signal to the transmitter output structure to protect the transmitter.

This utility model discloses a charger, relating to the field of charger technology, comprising: a charging module, including a constant current charging module for outputting a constant current to the battery and a constant voltage charging module for outputting a constant voltage to the battery; a power supply module for supplying power to the constant current charging module and the constant voltage charging module; and a switching module for controlling the constant current charging module to charge the battery until the battery voltage reaches a threshold, and controlling the constant voltage charging module to charge the battery after the battery voltage reaches the threshold. This utility model controls the constant current charging module to charge the battery until the battery voltage reaches the threshold, and then controls the constant voltage charging module to charge the battery after the battery voltage reaches the threshold, effectively avoiding the aggravated battery polarization caused by continuous constant current in the later stages of charging, and also avoiding damage to the battery caused by excessive current due to excessively high initial charging voltage.

This application discloses an overvoltage protection circuit for a high-voltage circuit. The circuit includes: an input terminal of a voltage detection module electrically connected to a high-voltage bus and one end of a shunt module; an output terminal of the voltage detection module electrically connected to one input terminal of an overvoltage detection module; an output terminal of a reference voltage acquisition module electrically connected to the other input terminal of the overvoltage detection module; and an output terminal of the overvoltage detection module electrically connected to the other end of the shunt module. The voltage detection module divides the input high-voltage bus voltage and outputs a detection voltage; the reference voltage acquisition module outputs a reference voltage; the overvoltage detection module compares the detection voltage with the reference voltage and outputs either a non-overvoltage signal or an overvoltage signal; and the shunt module shunts the current of the high-voltage bus according to the overvoltage signal to achieve overvoltage protection. This disclosure solves the technical problem that traditional overvoltage protection devices are difficult to apply in high-voltage and ultra-high-voltage scenarios, and achieves overvoltage protection for high-voltage circuits.