LOAD DRIVING APPARATUS WITH CURRENT BALANCE FUNCTION

摘要

A load driving apparatus including a power conversion circuit, a current balance circuit, a protection unit and a control chip is provided. The power conversion circuit is configured to receive a DC input voltage, and provide a DC output voltage to a plurality of light emitting units in response to a control signal. The current balance circuit has a plurality of switch elements corresponding to the light emitting units, and is configured to balance currents flowing through the light emitting units. The protection unit detects statuses of the switch elements and/or the DC output voltage. The control chip generates the control signal to control operations of the power conversion circuit; and stops generating the control signal and enters into a shutdown status when any one of the switch elements is open-circuit and/or the DC output voltage is over-voltage, thereby protecting the load driving apparatus and/or the switch elements from damaging.

主权项

1. A load driving apparatus, comprising:
a power conversion circuit, configured to receive a DC input voltage, and provide a DC output voltage to a plurality of light emitting units in response to a control signal; a current balance circuit, coupled to the light emitting units, having a plurality of switch elements corresponding to the light emitting units, and configured to balance currents flowing through the light emitting units; a protection unit, coupled to a plurality of common nodes between the light emitting units and the switch elements and the DC output voltage, and configured to detect statuses of the switch elements and/or the DC output voltage; and a control chip, coupled to the power conversion circuit and the protection unit, and configured to: generate the control signal to control operations of the power conversion circuit; and stop generating the control signal and enter into a shutdown status when any one of the switch elements is open-circuit and/or the DC output voltage is over-voltage, thereby protecting the load driving apparatus and/or the switch elements from damaging.