BYPASS SWITCH FOR IN-LINE POWER STEAL
First Claim
1. An in-line thermostat power system comprising:
- a controllable bypass switch having a first line voltage MOSFET and a second line voltage MOSFET, the controllable bypass switch receiving line voltage as an input;
a power stealing circuit receiving an output of the bypass switch as an input;
an energy storage circuit receiving an output of the power stealing circuit as an input;
an SCR interface circuit receiving an output of the energy storage circuit as an input; and
an SCR circuit receiving an output of the SCR interface circuit as an input.
4 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.
3 Citations
21 Claims
-
1. An in-line thermostat power system comprising:
-
a controllable bypass switch having a first line voltage MOSFET and a second line voltage MOSFET, the controllable bypass switch receiving line voltage as an input; a power stealing circuit receiving an output of the bypass switch as an input; an energy storage circuit receiving an output of the power stealing circuit as an input; an SCR interface circuit receiving an output of the energy storage circuit as an input; and an SCR circuit receiving an output of the SCR interface circuit as an input. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A thermostatic power supply mechanism comprising:
-
a first terminal for connection of a power source; a bypass switch having an input connected to the first terminal, the bypass switch comprising one or more MOSFETs that are switched; an SCR circuit having a first input connected to the first terminal, a second input for connection to a control signal source, and an output of a controlled line voltage for 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, the stealing circuit comprises an energy storage unit and stolen power goes to the energy storage. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
-
15. A power supply unit for a thermostat and electric heater comprising:
-
a bypass switch circuit having an input connectable to a first line voltage, the bypass switch circuit comprises one or more MOSFET switches; 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; and an SCR circuit having an input for connection to a control signal source 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)
-
Specification