Patent application number | Description | Published |
20120327544 | OVERVOLTAGE PROTECTION CIRCUIT - An overvoltage protection circuit includes a connection jack, a path connection module, a voltage response module, and a control module. The connection jack is connected to a power supply. The path connection module is connected between the connection jack and a load. The voltage response module is to output a first signal in response to an overvoltage, and output a second signal in response to a constant voltage. The control module is to output a corresponding potential according to the first signal to turn off the path connection module, and output a corresponding potential according to the second signal to turn on the path connection module. When the path connection module is turned off, the connection between the connection jack and the load is disabled, when the path connection module is turned on, the connection between the connection jack and the load is enabled. | 12-27-2012 |
20130003236 | POWER SUPPLY CIRCUIT - A power supply circuit for providing over-voltage protection includes a power supply unit and an output. The power supply unit includes a power input control terminal and a power output terminal. The power output terminal configured for connection to the output for supplying power to a load connected to the output. The power supply circuit includes an over-voltage response unit for connection to the output, and a control unit. The control unit is connected between the over-voltage response unit and the power input control terminal. The over-voltage response unit is configured for turning on the control unit. The control unit is configured for transmitting a control signal to the power supply unit to control the power supply unit to stop outputting power when it is turned on. | 01-03-2013 |
20130229163 | OVERVOLTAGE PROTECTION CIRCUIT AND ELECTRONIC DEVICE - An overvoltage protection circuit is arranged in an electronic device for providing a proper working voltage to the electronic device. The overvoltage protection circuit includes a first selecting circuit and a second selecting circuit connected in parallel to the first selecting circuit between a voltage input port and a voltage output port of the overvoltage protecting circuit. When an input voltage from the input port is less than a first value, the input voltage is output to the output port directly through the first selecting circuit, and when the input voltage is greater than the first value, the input voltage is output to the output port after the value of the input voltage is reduced through the second selecting circuit. | 09-05-2013 |
20130234676 | CHARGE INDICATOR CIRCUIT - An exemplary charge indicator circuit indicates the state of charge of a battery. The charge indicator circuit includes a connection jack, an indicator module, a voltage detection module, a charger IC, and a path connection module. The indicator module includes an indicator. The indicator is on when the battery is being charged. The voltage detection module is to output a first response signal when the connection jack is connected to the power supply. The charger IC is to manage the charging of the battery, and output a low level signal when a condition of the battery is satisfied. The path connection module is in a shunt circuit of the indicator module, and enables the shunt circuit of the indicator module to cause the indicator to be on when the voltage detection module outputs the first response signal and the charger IC outputs the low level signal. | 09-12-2013 |
20130238909 | POWER ENABLING CONTROL CIRCUIT AND ELECTRONIC DEVICE USING THE SAME - A power enabling control circuit is arranged in an electronic device. The electronic device includes a processor, a power integrated circuit, and a Moving Pictures Experts Group chip. The power enabling control circuit is connected to the processor and the Moving Pictures Experts Group chip for receiving a high level voltage from the processor or the Moving Pictures Experts Group chip. The power enabling control circuit is further connected to a power enabling port of the power integrated circuit to provide a high level voltage to the power enabling port based on the received high level voltage, causing the power integrated circuit in a working state to supply power to internal components of the electronic device. | 09-12-2013 |
20130241295 | POWER MANAGEMENT CIRCUIT AND ELECTRONIC DEVICE - A power source includes a first power terminal for outputting a first supply voltage. A power management circuit includes a pulse width modulation unit having an input power terminal, a first switch unit capable of being turned on to establish an electrical connection between the first power terminal and the input power terminal or being turned off to cut off the electrical connection, a storage unit. The input power terminal receives the first supply voltage from the first power terminal when the first switch unit is turned on, the pulse width modulation unit is powered by the first supply voltage to generate a pulse voltage at the output terminal. The storage unit receives the first supply voltage to store energy when the pulse voltage is in a first level, and releases energy to generate an operating voltage for powering the load when the pulse voltage is in a second level. | 09-19-2013 |
20130241500 | CHARGE CONTROL CIRCUIT - A charge control circuit includes a resistance module, a voltage comparing module, and a charge control module. The resistance module includes a thermistor, and the resistance of the thermistor varies according to the temperature of a battery. The voltage comparing module is connected to the resistance module. The voltage comparing module compares the voltage of the thermistor with upper and lower voltage limits to determine whether the temperature of the battery is in the charge temperature range. If the voltage comparing module determines the voltage of the thermistor is outside the allowed range, the comparing module outputs a control signal to control the charge control module to stop charging the battery. | 09-19-2013 |
20130246822 | ELECTRONIC DEVICE WITH STANDBY MODE - An electronic device with standby state includes a MCU, a voltage conversion unit, a screen lock circuit, and a power-saving trigger circuit. The voltage conversion unit is connected to the MCU and is used to convert a power supply voltage to a suitable voltage to power the MCU. The screen lock circuit includes a switch, therein, the screen lock circuit is connected to the MCU and is used to lock or unlock the electronic device in response to an operation on the switch when the electronic device is in a work state. The power-saving trigger circuit is connected to the MCU, the voltage conversion unit, and the screen lock circuit, and is used to disable or enable the voltage conversion unit in response to the operation on the switch when the electronic device is in the standby state. | 09-19-2013 |
20130249318 | ELECTRONIC DEVICE - An electronic device includes a power supply, a voltage sampling circuit, a processor, and a switching unit connected between the processor and the voltage sampling circuit. The voltage sampling circuit samples the voltage of the power supply. The processor monitors the sampled voltage. The processor further generates a first control signal when the electronic device is powered off. The switching unit cuts off the electrical connection between the power supply and the voltage sampling circuit in response to the first control signal. | 09-26-2013 |
20130258539 | OVERVOLTAGE PROTECTION CIRCUIT AND ELECTRONIC DEVICE - An electronic device powered by a voltage of a power supply includes a load, a switching module connected between the power supply and the load, and an overvoltage protection circuit. The overvoltage protection circuit comprises a control unit presetting a first predetermined voltage and an overvoltage protection unit. When the voltage is larger than the first predetermined voltage, the control unit generates a protection signal to control the overvoltage protection unit to generate a first control signal, the switching module cuts off an electrical connection between the power supply and the load in response to the first control signal. | 10-03-2013 |