Abstract: A charging device includes a case, a first connector, a first communication device, a processing device, and a driving device. The first communication device is configured to communicate with a second communication device of an electrical device and send a control signal to the processing device after communicating with the second communication device. The processing device is configured to output a driving signal to the driving device after receiving the control signal. The driving device is configured to provide a pushing force to push the first connector to extend from the case to couple to a second connector of the electrical device after receiving the driving signal. The first connector is further configured to charge the electrical device after couple to the second connector. A charging system is also provided.

Abstract: A wireless charging system uses a transformer to adjust output voltage of the charging antenna to reduce the voltage in the resonant capacitor for a wireless charging coupling.

Abstract: A warning system for a vehicle includes a mobile warning tripod and a portable electronic device communicating with the tripod. The tripod includes a driving unit, a movement unit, and a warning unit. The electronic device has an application with a user interface. The user interface includes icons to control a movement control unit in the electronic device. The movement control unit sends control signals to the driving unit of the tripod in response to user operations on one or more of the icons. The driving unit moves the tripod to move as required. A vehicle warning method is also disclosed.

Abstract: A wireless charger includes a wireless charging transmitter. The wireless charging transmitter includes a transmission antenna, a driving circuit, a transmission temperature sensor, and a controller. The driving circuit can output a charging signal in a fast charging mode initially. The transmission temperature sensor can detect a transmission temperature value of the transmission antenna. The controller can receive the transmission temperature value from the transmission temperature sensor. The driving circuit is can output the charging signal in a fast charging mode initially. When the transmission temperature value is greater than an overheat value, the controller can control the driving circuit to output in a slow charging mode.

Abstract: A road traffic alarm and warning device, moveably mounted to an enclosure of a car and configured to notify a traffic obstacle and coupled to a main controller, includes a first communication unit configured to couple to the main controller and send out a control signal. An operation unit is configured to receive the control signal and output a driving signal according to the control signal and a driving unit is configured to receive the driving signal and move as required driving the alarm device to move out of the enclosure and into action. An alarm system with the alarm device is further disclosed.

Abstract: An alternating current to direct current converter system includes an alternating current power supply, an external electronic load, a first MOS transistor, a first control module, a first switch and a second control module. The alternating current power supply includes a first output end and a second output end. The first control module controls the first MOS transistor to active when the first output end has a positive voltage and control the first MOS transistor to turn off when the second output end has a positive voltage. The first switch connects to a first end of the external electronic load and the second output end. The second control module connects to the first switch. The second control module controls the first switch to active when the second output end has a positive voltage and controls the switch to turn off when the first output end has a positive voltage.

Abstract: An alternating current to direct current converter system includes an alternating current power supply, an external electronic load, a first MOS transistor, a first control module, a first switch and a second control module. The alternating current power supply includes a first output end and a second output end. The first control module controls the first MOS transistor to active when the first output end has a positive voltage and control the first MOS transistor to turn off when the second output end has a positive voltage. The first switch connects to a first end of the external electronic load and the second output end. The second control module connects to the first switch. The second control module controls the first switch to active when the second output end has a positive voltage and controls the switch to turn off when the first output end has a positive voltage.

Abstract: A wireless charger system includes a charging module and at least one receiving module. The receiving module is configured to receive a power from the charging module wirelessly for charging a device. The charging module includes a source module, a control module, and a charging antenna. The receiving module includes a receiving antenna and a converting module. The control module is also configured to detect a perturbation of a current of the charging module. When the perturbation is detected, the control module is configured to increase a voltage outputted from the source module; when the perturbation is not detected, the control module is configured to decrease the voltage outputted from the source module. The disclosure further provides a wireless charger method.

Abstract: A rectifier includes a first diode, a second diode, a first switch and a second switch. Each of the first switch and the second switch includes a controlling pole, a first connecting pole and a second connecting pole. A positive pole of the first diode, the second connecting pole of the first switch, and the controlling pole of the second switch are coupled to a first pole of an alternating current (AC) power. A positive pole of the second diode, the second connecting pole of the second switch, and the controlling pole of the first switch are coupled to a second pole of the AC power. A negative pole of the first diode and a negative pole of the second pole are coupled to an output pole, and the first connecting pole of the first switch and the first connecting pole of the second switch are grounded.

Abstract: A wireless charger includes a wireless charging transmitter. The wireless charging transmitter includes a transmission antenna, a driving circuit, a transmission temperature sensor, and a controller. The driving circuit can output a charging signal in a fast charging mode initially. The transmission temperature sensor can detect a transmission temperature value of the transmission antenna. The controller can receive the transmission temperature value from the transmission temperature sensor. The driving circuit is can output the charging signal in a fast charging mode initially. When the transmission temperature value is greater than an overheat value, the controller can control the driving circuit to output in a slow charging mode.

Abstract: A wireless charging system uses a transformer to adjust output voltage of the charging antenna to reduce the voltage in the resonant capacitor for a wireless charging coupling.

Abstract: To monitor temperatures at multiple areas of class D/E power amplifier, DC/DC converting unit and an antenna in a wireless charger, place a thermal conductive and electro-insulative layer covering the class D/E power amplifier, the DC/DC converting unit and the antenna, and use one temperature sensor to sense the temperature of the thermal conductive and electro-insulative layer.