Power supply for electronic thermostat
AssigneeCarrier Corporation
InventorThomas C. Baker
Life of this patent
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Abstract
A power supply circuit for an electronic thermostat includes a half wave rectifier, at least one voltage dropping resistor and a gated rectifier. The gated rectifier preferably conducts only when the voltage at its output drops below the voltage at its gate. The voltage at the gate is defined by gating circuitry downstream of the voltage dropping resistors. The intermittent conduction of the silicon controlled rectifier produces less current flow through voltage dropping resistors within the power supply circuit. This causes less heat dissipation by these resistors within the thermostat.
Claims12
A power supply circuit for providing an operating level voltage to components of an electronic thermostat, said power supply circuit comprising:
- half wave rectifying means;
- resistive means connected to said half wave rectifying means so as to decrease the voltage of the half wave signal produced by said half wave rectifying means;
- a gated rectifier means having an input for receiving the decreased voltage half wave signal produced by said resistive means, said gated rectifier means having a gate which is held by gating circuitry to within certain voltage limits whereby the voltage at the output of the gated rectifier means is also held within certain voltage limits, the voltage at the output of said gated rectifier means being the operating level voltage to the components of an electronic thermostat.
Dependencies are inferred from the claim text.