Patent ID: 7276818

Claim:
An energy-saving drive apparatus for DC loads, comprising: a) a DC power source for supplying a DC voltage to a DC load; b) a blocking oscillator for converting the electric current inputted from the DC power source into a pulse signal voltage V 1 ; c) an amplifier connected at an output terminal of the blocking oscillator for amplifying the pulse signal voltage V 1 so as to obtain an amplified signal voltage V 2 ; d) an AC-DC-converter connected at an output terminal of the amplifier for converting the amplified signal voltage V 2 into an initial DC voltage V 3 and an initial DC current I 1 ; e) a voltage comparator connected at an output terminal of the AC-DC-converter for comparing the inputted initial DC voltage V 3 with the voltage signal at another output terminal and for supplying a constant voltage V 4 to the load; f) a current comparator connected at an output terminal of the AC-DC-converter for comparing the inputted initial DC current I 1 with the current signal at another output terminal and for supplying a constant current I 2 to the load; and g) a signal feedback circuit interposed between the load and the voltage comparator as well as between the load and the current comparator, the signal feedback circuit obtaining a load signal voltage V 5 from the load, wherein, after a feedback operation, a comparison voltage V 6 and a comparison current I 3 are transmitted to the input terminal of the voltage comparator and the current comparator, and after the different signal voltages V 3 , V 6 and currents I 1 , I 3 are compared, analyzed, edited and sorted, a constant voltage circuit between the load and the voltage comparator as well as a constant current circuit between the load and the current comparator give out a corrected constant voltage value V 4-1 and a corrected constant current value I 2-1 , respectively, for re-driving the load, whereby the voltage and current impedance of the load can be matched to each other by the correcting process of the signal voltage and current for achieving an optimal and efficient power-saving output state.