TRIAC OR BYPASS CIRCUIT AND MOSFET POWER STEAL COMBINATION
First Claim
1. A power supply unit for a heat, ventilation and air conditioning thermostat, comprising:
- a triac having an input and an output;
a stealing circuit comprising an energy storage module; and
a MOSFET power steal module having an input connected to the output of the triac; and
wherein;
the MOSFET power steal module steals energy and the stolen energy goes to the energy storage module; and
the stolen energy is used to trigger the triac at a zero crossing of line voltage from a power source.
2 Assignments
0 Petitions
Accused Products
Abstract
A power supply unit for use with thermostats or other like devices requiring power. A power supply unit may be designed to keep electromagnetic interference emissions at a minimum, particularly at a level that does not violate governmental regulations. A unit may be designed so that there is enough power for a 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 rather than line power to reduce emissions on the power line. Power for the storage source may be provided with power stealing. Power stealing may require switching transistors which can generate emissions. Gate signals to the transistors may be especially shaped to keep emissions from transistor switching at a minimum.
3 Citations
20 Claims
-
1. A power supply unit for a heat, ventilation and air conditioning thermostat, comprising:
-
a triac having an input and an output; a stealing circuit comprising an energy storage module; and a MOSFET power steal module having an input connected to the output of the triac; and wherein; the MOSFET power steal module steals energy and the stolen energy goes to the energy storage module; and the stolen energy is used to trigger the triac at a zero crossing of line voltage from a power source. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. Power supply electronics for a thermostat, comprising:
-
a triac having an input connected to a power source; a bypass circuit having an input connected to the input of the triac; a stealing circuit having an energy storage unit, the stealing circuit has an input connected to an output of the bypass circuit; and a power steal module having an input connected to the output of the triac. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
-
15. A thermostatic power supply comprising:
-
a first terminal for connection to a power source; a bypass circuit having an input connected to the first terminal; an energy storage module having an input connected to the bypass circuit; a triggerable switch having an input connected to the first terminal; and a power steal module having an input connected to an output of the triggerable switch, the power steal module comprising one or more MOSFETs. - View Dependent Claims (16, 17, 18, 19, 20)
-
Specification