BYPASS SWITCH FOR IN-LINE POWER STEAL
First Claim
1. An in-line thermostat power system comprising:
- a bypass switch;
a power stealing circuit connected to the bypass switch;
an energy storage circuit connected to the power stealing circuit;
an SCR interface circuit connected to the energy storage circuit; and
an SCR circuit connected to the SCR interface circuit; and
wherein the bypass switch is a controllable switch for line voltage.
3 Assignments
0 Petitions
Accused Products
Abstract
A power supply unit for use with thermostats or other like devices. The power supply unit may keep electromagnetic interference emissions and harmonics at a minimum. A unit may have enough power for triggering a switch at about a cross over point of a waveform of input power to the unit. Power for triggering may come from a storage source. Power for the storage source may be provided with power stealing which require switching transistors which can generate emissions. In-line thermostats using MOSFETS power steal may do the power steal during an ON state (triac, relay or silicon controlled rectifier activated). Gate signals to the transistors may be especially shaped to keep emissions from transistor switching at a minimum. All that may be needed, during an OFF state as a bypass, is a high voltage controllable switch. The need may be achieved using high voltage MOSFETS.
11 Citations
21 Claims
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1. An in-line thermostat power system comprising:
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a bypass switch; a power stealing circuit connected to the bypass switch; an energy storage circuit connected to the power stealing circuit; an SCR interface circuit connected to the energy storage circuit; and an SCR circuit connected to the SCR interface circuit; and wherein the bypass switch is a controllable switch for line voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A thermostatic power supply mechanism comprising:
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a first terminal for connection of a power source; a bypass switch having an input connected to the first terminal; an SCR circuit having a first connection connected to the first terminal, an input for a control signal, and a second connection connectable to a load; a second terminal for connection to a load; a stealing circuit having an input connected to an output of the bypass switch, and an output connected to the second terminal; and a power steal module having an input connected to the output of the SCR circuit and an output connected to the second terminal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A power supply unit for a thermostat and electric heater comprising:
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a bypass switch circuit having an input connectable to a first line voltage; a power steal device having an input connectable to an output of the bypass switch circuit; an energy storage having an input connected to an output of the power steal device; an SCR gate signal circuit having an input connected to an output of the energy storage; and an SCR circuit having an input from an output of the SCR gate signal circuit and an input connectable to a second line voltage, and having an output for providing a controlled second line voltage. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification