Temperature compensated, regulated power supply and battery charger for railroad signal use
First Claim
1. A temperature compensated, regulated power supply and battery charger for supplying power to railroad warning lights and crossing gates including a ferroresonant transformer having a primary winding, a secondary winding, and a resonant circuit in magnetic circuit therewith, output terminals connected to said secondary winding, a shunt regulator connected across said output terminals and connected to said secondary winding, a temperature sensing element connected to said shunt regulator, said shunt regulator varying the output voltage at said output terminals in response to temperature sensed by said temperature sensing element.
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Accused Products
Abstract
A temperature compensated, regulated power supply and battery charger for supplying power to railroad warning lights and crossing gates utilizes a ferroresonant transformer having a primary winding, a secondary winding, and a resonant circuit in magnetic circuit therewith. Voltage regulation is accomplished at essentially no load conditions by the use of a temperature sensing element and a shunt regulator connected in circuit with the output terminals of the secondary winding. The shunt regulator varies the output voltage at the output terminals in response to temperature sensed by the temperature sensing element during essentially no load conditions.
26 Citations
12 Claims
- 1. A temperature compensated, regulated power supply and battery charger for supplying power to railroad warning lights and crossing gates including a ferroresonant transformer having a primary winding, a secondary winding, and a resonant circuit in magnetic circuit therewith, output terminals connected to said secondary winding, a shunt regulator connected across said output terminals and connected to said secondary winding, a temperature sensing element connected to said shunt regulator, said shunt regulator varying the output voltage at said output terminals in response to temperature sensed by said temperature sensing element.
- 5. A temperature compensated, regulated power supply and battery charger for supplying power to railroad warning lights and crossing gates including a ferroresonant transformer having primary, secondary, resonant circuit and regulating windings, with the regulating winding being on the secondary side of the transformer, output terminals connected to said secondary winding, a temperature sensing element, a shunt regulator connected to said temperature sensing element, said shunt regulator being connected to said regulating winding and connected across said output terminals to provide voltage regulation at said output terminals.
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10. A temperature compensated, regulated power supply and battery charger for supplying power to railroad warning lights and crossing gates having output terminals, a temperature sensing element and means for varying the output voltage at said output terminals in response to temperature sensed by said temperature sensing element, and means for stopping temperature compensation when there is a crossing gate or lighting load applied to said output terminals whereby said temperature compensated voltage regulation only applies during essentially no load conditions.
- 11. A temperature compensated, regulated power supply and battery charger for supplying power to railroad warning lights and crossing gates including a ferroresonant transformer having primary, secondary, resonant circuit and regulating windings, with the regulating winding being on the secondary side of the transformer, output terminals connected to said secondary winding, a temperature sensing element and a shunt regulator in circuit with said regulating winding, load resistor means connected to said output terminals, and control means responsive to said shunt regulator for controlling the magnitude of said load resistor means whereby said shunt regulator controls the load across said output terminals which regulates the voltage thereof.
Specification