| 摘要 |
定电流控制电路包含一取样保持单元，耦接于一电源转换器之电流侦测电阻，用以储存该电流侦测电阻之一电流侦测电压；一第一电容，用以储存一比较电压；一放电单元，耦接于该取样保持单元及该第一电容之间，用以根据一参考电压及该取样保持单元储存之该电流侦测电压控制该第一电容之放电电流大小；一充电单元，耦接于该第一电容，用以根据该参考电压及一接地电压控制该第一电容之充电电流大小；以及一比较器，用以比较该比较电压及该参考电压以产生一比较结果，并根据该比较结果输出一控制讯号，以控制该电源转换器之工作周期。; a first capacitor for storing a comparison voltage; a discharge unit coupled between the sample and hold unit and the first capacitor, for controlling a discharge current of the first capacitor according to a reference voltage and the current sensing voltage stored in the sample and hold unit; a charge unit coupled to the first capacitor, for controlling a charging current of the first capacitor according to the reference voltage and a ground voltage; and a comparator for comparing the comparison voltage with the reference voltage to generate a comparison result, and outputting a control signal according to the comparison result, in order to control a duty cycle of the power converter. |
