Abstract:
A load current compensated voltage sampling circuit is characterized by a sampling voltage that is compensated by utilizing different load current values of the detected sample as parameters for transforming into the intended display target value.

Description:
BACKGROUND OF THE INVENTION 
     (a) Field of the Invention 
     The present invention relates to a load current compensated voltage sampling circuit, wherein the sampling voltage is compensated by utilizing different load current values of the detected sample as parameters for transforming into an intended display target value. 
     (b) Description of the Prior Art 
     All AC or DC power sources have internal impedance. Therefore the measured end voltages at no-load, low load, heavy load and overload conditions vary by the load current and internal impedance so that it is very difficult to detect the average value in frequent load changes. 
     SUMMARY OF THE INVENTION 
     The present invention relates to a load current compensated voltage sampling circuit, wherein different load current values of a detected sample are used as parameters to compensate the sampling AC or DC voltage at no-load, low load, heavy load and overload conditions for transforming into an intended display target value. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a block diagram of the load current compensated voltage sampling circuit according to the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The load current compensated voltage sampling circuit of the present invention is shown in FIG.  1  and includes the following constituting units: 
     A voltage detector circuit VD 100 , comprised of electromechanical devices or solid state electronic components. The voltage detector circuit VD 100  is series connected with a controllable impedance modulating circuit VR 100 , the is parallel connected with a power source. The voltage detector circuit VD 100  sends the detected voltage value to an independently constituted linear-setting display device DP 100 , or the voltage detector circuit VD 100  and the linear-setting display device DP 100  may be in an integral structure. The linear display device includes an analog indicator, a multi-stage light display or a digital display device. 
     A current value detector device AD 100 , comprised of electromechanical devices or solid state electronic components. The current detector device AD 100  is series connected between the power source and load to generate a corresponding electric power signal following load current changes to directly control the corresponding set impedance changes of the controllable impedance modulating circuit VR 100 , and to adjust the measured voltage detected by the voltage detector circuit VD 100 . An interface circuit CD 100  can be further installed between the current detector device AD 100  and a controllable impedance modulating circuit VR 100  for enlargement, value insertion, linear modification or limitation or other setting functions. 
     A controllable impedance modulating circuit VR 100 , comprised of electromechanical devices or solid state electronic components. The controllable impedance modulating circuit VR 100  is directly controlled by the current detector device AD 100  or by the interface circuit CD 100  to produce corresponding impedance changes. 
     An interface circuit CD 100 , comprised of electromechanical devices or solid state electronic components. The interface circuit CD 100  is installed between the current detector device AD 100  and the controllable impedance modulating circuit VR 100  for enlargement, value insertion, linear modification or limitation, or other setting functions. This circuit can be installed or not installed according to the circuit requirement. 
     A linear setting display device DP 100 , comprised of electromechanical devices or solid state electronic components such as an analog indicator, a digital display, or a multi-stage lighting indicator device to display voltage value or the intended display target value that is transformed from the detected voltage value. In addition, the display device DP 100  can be comprised of an instant reacting display device and further be installed with a mechanical hysteresis damping inside the analog indicator linear-setting display device, a randomly stopped LATCH mechanism, a debounce circuit, a debounce circuit between the analog indicator or multi-stage display circuit input ends, or between the analog input ends of the digital display analog A/D converter, software, or a periodically refreshed sampling LATCH circuit to avoid confusion in reading the display device DP 100  due to frequent display changes caused by the high density transient load variations. 
     One or more than one of the aforesaid individual structural units can be combined to constitute a common embodiment according to the characteristics and structural requirements of the electromechanical devices and electronic circuits.