| 摘要 |
<p>A load driving circuit includes: a limited current circuit and a set of loads being driven are connected in series between the two outputs of direct voltage; the limited current circuit is used to control the current value of the loads within the set of loads not larger than a preset limited current point; a first adjusting transistor is connected in parallel with the subset of the set of loads and the limited current circuit which are connected in series; a sampling signal output of a current sampler is connected with an input of a current feedback controller, and is used to sample the load current of the set of loads to transmit the current signal obtained by sampling to the current feedback controller; the current feedback controller, an output of which is connected with the switching controller of the first adjusting transistor, is used to receive the current signal, to control the first adjusting transistor to turn off when it is determined that the current value of the current signal is not smaller than a preset stabilized current point, to control the first adjusting transistor to turn on when it is determined that the current value of the current signal is smaller than a preset stabilized current point, and to control the conducting impendence of the first adjusting transistor according to the current value of the current signal. The load driving circuit can reduce the power loss and improve the driving efficiency of load.</p> |
