Abstract: A testing circuit for testing a universal serial bus (USB) of an electronic device includes a controller, a first switch, a pull-down resistor, a gating pull-up resistor, and a second switch. The controller provides a control signal according to a power receiving condition of the electronic device. A control terminal of the first switch is coupled to the controller. The pull-down resistor is coupled between a configuration channel pin of the USB and a first terminal of the first switch. The gating pull-up resistor is coupled between the configuration channel pin and the control terminal of the first switch. A control terminal of the second switch is coupled to the controller. A first terminal of the second switch is coupled to a second terminal of the first switch and a ground pin of the USB. A second terminal of the second switch is coupled to a reference low voltage.

Abstract: A testing circuit for testing a universal serial bus (USB) of an electronic device includes a controller, a first switch, a pull-down resistor, a gating pull-up resistor, and a second switch. The controller provides a control signal according to a power receiving condition of the electronic device. A control terminal of the first switch is coupled to the controller. The pull-down resistor is coupled between a configuration channel pin of the USB and a first terminal of the first switch. The gating pull-up resistor is coupled between the configuration channel pin and the control terminal of the first switch. A control terminal of the second switch is coupled to the controller. A first terminal of the second switch is coupled to a second terminal of the first switch and a ground pin of the USB. A second terminal of the second switch is coupled to a reference low voltage.

Abstract: A signal switch chip with a chip voltage is disclosed. The signal switch chip includes a transmission gate and a voltage multiplying circuit. The voltage multiplying circuit receives a basic voltage to generate a multiplying voltage, and the multiplying voltage is N times the basic voltage. N is a positive integer, and N is greater than 1. The transmission gate is coupled to the multiplying circuit and receives the multiplying voltage to adjust an equivalent impedance of the transmission gate, and the multiplying voltage is higher than the chip voltage.

Abstract: The invention relates to a control device of an electric skateboard, and more particularly, to a device which is controlled in non-touch manner for enhancing the operating fun. The exercise device includes an electric skateboard having a signal-receiving unit and a control glove having a signal-sending unit. A motor in connection with the signal-receiving unit is mounted on the bottom of the electric skateboard for driving wheels to provide forward movement for the skateboard. When the signal-sending unit on the control glove continuously sends signals for actuating the motor, the signal-receiving unit on the skateboard will receive the signals which are then forwarded to microprocessors to control the rotation of the motor at a preset speed.

Abstract: The present invention relates to a charging controller for electric walkers comprising a charging controller and a charging driver both of which are fitted to the basic circuit of the main processor of the electric walker. Accordingly, the charging operation of the electric walker can be easily performed through a commercially available rectifier with certain rectified voltage. After the charging controller in connection with the rectifier to detect the inflow of the external power, the external current will be immediately supplied to the battery for executing the charging operation. Thereafter, this message will be sent to a microprocessor while the charging driver disconnects the linking circuit between the microprocessor and a motor after the actuation of the charging operation.