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Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0751398 (1991-08-28) |
발명자 / 주소 |
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출원인 / 주소 |
|
인용정보 | 피인용 횟수 : 294 인용 특허 : 0 |
A control system which minimizes the start up time of heaters and sustains long term automatic control is provided. This control system automatically converts control time constant current to constant power when the power reaches the power set and provides that after power interruptions, control wil
A control system which minimizes the start up time of heaters and sustains long term automatic control is provided. This control system automatically converts control time constant current to constant power when the power reaches the power set and provides that after power interruptions, control will revert back to constant current until constant power control is again called for. The heater controlled by the control system of this invention is preferably a subterranean heater having a long heating element.
An apparatus to control electrical current to a heater which consumes power to generate heat comprising: a) a means to measure current, said means which generates a measured current signal which varies with the electrical current going to the heater; b) a means to measure power consumed by the heate
An apparatus to control electrical current to a heater which consumes power to generate heat comprising: a) a means to measure current, said means which generates a measured current signal which varies with the electrical current going to the heater; b) a means to measure power consumed by the heater, said means which generates a measured power signal which varies with the power consumed by the heater; c) a current set point signal means which generates a current set point signal which corresponds to a maximum current; d) a power set point signal means which generates a power set point signal which corresponds to a maximum power; e) a comparator which receives the power set point signal and the measured power signal and generates a transfer signal when the measured power signal is equal to or greater than the power set point signal; f) a power-up signal means which detects power service increasing from essentially zero RMS volts to a higher RMS voltage and generates a power-up signal when the power service RMS voltage increase is detected; g) a means to generate a reset signal; h) an electronic latching device which receives the transfer signal, the power-up signal, and the reset signal, and generates a power control signal from when the transfer signal is detected until a power-up signal or a reset signal is detected and does not generate a power control signal from when a reset signal or a power-up signal is received until a transfer signal is received; i) a switching means which passes an input of the current set point signal to a set point output and which passes the measured current signal to a process output when the latching device is not generating a power control signal and when the latching device is generating a power control signal, passes an input of the power set point to the set point output and the measured power signal to the process output; and j) a voltage controller means which controls voltage to the heater to maintain the process input at about the set point output.
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