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| A self contained microprocessor based system, such as a thermostatic control, produces its own operating power from a thermocouple array heated by a pilot flame. In contrast to an electromechanical thermostat which requires no electrical power for operation, a microprocessor based electronic thermostat requires electrical operating power at a voltage of from five to twelve volts. In some applications, such as domestic water heaters and some swimming pool and spa heaters, utility based electrical service may not be conveniently available. The required voltage is produced by stepping up the fraction of a volt produced by the thermocouple array. Voltage step up is accomplished with a special DC driven oscillator in the form of a field effect transistor with a high impedance feedback network between its drain and gate electrodes. The feedback network is in the form of a tank circuit which utilizes the inductance of a transformer whose primary and secondary windings are in the drain and gate circuits respectively of the field effect transistor and a capacitor between the transformer secondary and the gate electrode.A possible unrelated application may be an industrial or laboratory transmitter or alarm for which operating power is generated from an already present pilot or other small flame.self-energizing fuel control burner produces electrical current voltage (five twelve volts) powering microprocessor thermocouple array heated pilot flame output approximately 01 075 DC drive special oscillator circuit field effect transistor impedance feedback network transformer whose primary winding source-drain secondary stepped AC coupled gate phase shifting capacitor create rectified regulated energize solid state temperature valve feature drives light emitting dioded indicator predetermined repetition rate sufficient operation |
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