Patent ID: 8466670

Claim:
A power supply for energizing a load, said power supply comprising: a power current source including a control input port, for sourcing a current, the magnitude of which depends upon a control voltage applied to the control input port of the power current source; a load capacitor connected to said power current source and to said load, for averaging current from said power current source for generating load voltage; a power current source current-to-voltage converter for generating a voltage representative of the current of said power current source; a current controller coupled to said control input port of said power current source for generating said power current source control voltage, said current controller being connected to a reference capacitor for comparing said voltage representative of the current with a first reference voltage appearing across said reference capacitor, and for controlling said power current source to increase current when said voltage representative of the current is greater than said first reference voltage across said reference capacitor; and a window comparator coupled to said current controller and to said load capacitor, for comparing a first scaled load voltage and a second scaled load voltage with a second reference voltage having a value lying between upper and lower permissible values of said scaled load voltages, for, when said first scaled load voltage is greater than said second reference voltage, draining current from said reference capacitor, and for, when said second scaled load voltage is greater than said second reference voltage, charging said reference capacitor.