Constant voltage power supply
First Claim
1. In a constant voltage ac source having an oscillator stage for generating a constant frequency ac, an output stage, a driver stage for supplying an output voltage from said oscillator stage to the output stage, the output stage adapted to drive a load having a specified thermal inertia, and means for deriving a control signal indicative of the amplitude of the output voltage, an output voltage amplitude control circuit comprisinga voltage storage means for supplying energizing voltage to the oscillator stage and the driver stage,means for maintaining over a specified time period the average voltage of said voltage storage means,said specified time period being a function of the thermal inertia of an intended load,said means for maintaining including means responsive to said control signal for periodically supplying voltage pulses to said voltage storage means only when the output voltage is below a desired level.
5 Assignments
0 Petitions
Accused Products
Abstract
A constant voltage power supply employs a circuit in which the average voltage over a specified period of time is maintained constant by a circuit for charging a voltage storage means with width modulated pulses applied several times during each specified period whereby to charge the storage means above the desired average level and terminating charging until the voltage falls below the specified level. The period of time over which the voltage is averaged is a function of the thermal inertia of a load to be driven. The average voltage is employed as the energizing circuit to a high frequency oscillator, and driver stages supplying the output of the oscillator to an output stage of a power supply whereby the energizing voltage of the stages and thus the dissipation of energy therein does not exceed that required to feed the lead at its then current energy requirements.
-
Citations
9 Claims
-
1. In a constant voltage ac source having an oscillator stage for generating a constant frequency ac, an output stage, a driver stage for supplying an output voltage from said oscillator stage to the output stage, the output stage adapted to drive a load having a specified thermal inertia, and means for deriving a control signal indicative of the amplitude of the output voltage, an output voltage amplitude control circuit comprising
a voltage storage means for supplying energizing voltage to the oscillator stage and the driver stage, means for maintaining over a specified time period the average voltage of said voltage storage means, said specified time period being a function of the thermal inertia of an intended load, said means for maintaining including means responsive to said control signal for periodically supplying voltage pulses to said voltage storage means only when the output voltage is below a desired level.
-
2. A voltage control system comprising
a variable voltage source, and means for maintaining over a specified period of time the average voltage of said voltage source at a specified level, said means for maintaining including means responsive to a function of the voltage of said voltage source for periodically increasing the voltage of said voltage source only when its voltage is below said specified level.
-
9. A method of maintaining an average level of voltage of a voltage storage means over a specified period of time comprising the steps of
sensing an instantaneous voltage of the voltage storage means, periodically charging the voltage storage means to a voltage above the average level with voltage pulses several times during each specified period of time only when the voltage of said voltage storage means is below the desired average level, and controlling the length of the voltage pulses as a function of the instantaneous voltage of the voltage storage means.
Specification