Other

Kun Cheng

Jianbo Sun

Zutao Liu

Gang Shi

An intelligent shopping cart, an intelligent shopping system and an implementation method thereof. The intelligent shopping cart includes a cart body; and the cart body includes a storage unit and a handle, and further includes an intelligent terminal device configured on the handle. The intelligent terminal device is provided with a touchscreen computer having a display function and/or an operation function. The cart body is provided with an RFID tag for storing number information of the intelligent shopping cart. The cart body is further provided with a device in a communication connection to the touchscreen computer, and the device at least includes one or a combination of a weight sensor, a monitoring device, a code-scanning device, a positioning device, and a voice broadcasting device.

Intelligent shopping cart, intelligent shopping system and implement method therefor

The present invention relates to a parallel light emitting diode ('LED') drive circuit and provides a drive circuit configured to drive a parallel array of LEDs. The drive circuit comprises: a plurality of switches, a plurality of sampling resistors, and a plurality of chopper amplifiers. Each switch is coupled to a respective LED in the LED array. Each chopper operational amplifier configured to receive a reference voltage and a switching control signal and generate an input offset voltage. Each chopper operational amplifier includes a differential amplifier including an input transistor pair and a current mirror transistor pair, of which the electrical positions can be reserved when the switching control signal is switched between a first state and a second state, wherein the offset voltage, which causes the lightness mismatching in a parallel LED circuit, can be cancelled.

Drive circuit for parallel array of light emitting diodes

The present invention relates to a parallel light emitting diode ('LED') drive circuit and provides a drive circuit configured to drive a parallel array of LEDs. The drive circuit comprises: a switching control signal generator, a plurality of switches, a plurality of sampling resistors, and a plurality of chopper amplifiers. Each switch is coupled to a respective LED in the LED array. Each chopper operational amplifier configured to receive a reference voltage and a switching control signal generated by the switching control signal generator and generate an input offset voltage. Each chopper operational amplifier includes a differential amplifier including an input transistor pair and a current mirror transistor pair, of which the electrical positions can be reserved when the switching control signal is switched between a first state and a second state, wherein the offset voltage, which causes the lightness mismatching in a parallel LED circuit, can be cancelled.

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Kun Cheng