MOSFET GATE DRIVING CIRCUIT FOR TRANSITION SOFTENING
First Claim
1. A thermostat power supply comprising:
- a first terminal for connection to a first line of a power source;
a triac having a first input connected to the first terminal;
a bypass circuit having a first input connected to the first terminal;
a stealing circuit having an input connected to an output of the bypass circuit;
a power steal module having an input connected to an output of the triac and an output connected to an output of the stealing circuit;
a second terminal for connection to a load;
a zero crossing detection module having an input connected to the first terminal; and
a gate driving circuit having an input connected to an output of the zero crossing detection module, and an output connected to a second input of the power steal module.
3 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.
9 Citations
20 Claims
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1. A thermostat power supply comprising:
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a first terminal for connection to a first line of a power source; a triac having a first input connected to the first terminal; a bypass circuit having a first input connected to the first terminal; a stealing circuit having an input connected to an output of the bypass circuit; a power steal module having an input connected to an output of the triac and an output connected to an output of the stealing circuit; a second terminal for connection to a load; a zero crossing detection module having an input connected to the first terminal; and a gate driving circuit having an input connected to an output of the zero crossing detection module, and an output connected to a second input of the power steal module. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A power unit comprising:
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a first terminal for connection to a power source; a triggerable switch having an input connected to the first terminal; a bypass circuit having an input connected to the first terminal; a storage having an input connected to an output of the bypass circuit; a power steal module having an input connected to an output of the triggerable switch and having an output connectable to a second terminal; a second terminal for connection to a load connected to the power source; a zero crossing detector having an input connected to the first terminal; and a gate driving circuit having an input connected to the zero crossing detector, and having an output connected to the power steal module. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A thermostat power system comprising:
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a first terminal for connection to a power supply and load arrangement; a second terminal for connection to the power supply and load arrangement; a triggerable switch, having an input, connected to the first terminal; a bypass circuit having an input connected to the first terminal; an energy storage module having an input connected to an output of the bypass circuit; a power steal module having an input connected to an output of the triggerable switch; and a driving circuit for a control signal having an output connected to a second input of the power steal module; and wherein the control signal minimizes EMI emissions from the power steal module. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification