Temperature control system
AssigneeCanon Kabushiki Kaisha
InventorsKatsushi Furuichi, Kenji Kurita, Yoshimasa Kimura, Hisashi Sakamaki
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Abstract
A temperature control system comprises a heat sink heatable upon application of electric power thereto, an AC power source for heating the heat sink, temperature detector means for detecting the temperature of the heat sink, and control means for controlling the electric power applied to the heat sink in accordance with an output signal from the detector means so that the heat sink maintains its required temperature. The control means is operable to cause application of a full power of the power source to the heat sink at the initial heating stage thereof and application of a partial power of the power source to the heat sink when the temperature thereof is in the vicinity of the required temperature.
Claims17
A temperature control system comprising:
- a heat sink;
- an AC power source for heating said heat sink;
- means for detecting the temperature of said heat sink and to generate a signal corresponding to the detected temperature;
- means, responsive to the signal, for generating a first control signal when the temperature detected by said detecting means is under a predetermined temperature;
- means for generating a second control signal to supply a partial power of said AC power source to said heat sink when the temperature detected by said detecting means reaches the predetermined temperature;
- means responsive to at least one of said, first and second control signals for controlling the supply of power from said power source to said heat sink;
- whereby said heat sink is supplied with full power from said AC power source in response to said first control signal when the temperature detected by said detecting means is under the predetermined temperature, and said heat sink is supplied with the partial power from said AC power source in response to said second control signal when the temperature detected by said detecting means reaches the predetermined temperature.
A temperature control system comprising:
- a heat sink;
- an AC power source for heating said heat sink;
- means for detecting the temperature in the proximity of said heat sink and generating a detecting signal;
- means for generating a first control signal in response to the detecting signal when the temperature detected by said detecting means is under a predetermined level and for generating a second control signal, different from the first control signal, in response to the detecting signal when the temperature detected by said detecting means is over the predetermined level;
- and
- means for controlling the supply of power from said AC power source to said heat sink in response to one of, the first and second control signals;
- whereby full power of said AC power source is supplied to said heat sink in response to the first control signal when the temperature detected by said detecting means is under the predetermined level, and partial power of said AC power source is supplied to said heat sink in response to the second control signal when the temperature detected by said detecting means is over the predetermined level.
A temperature control system comprising:
- a load;
- an AC power source for supplying power to said load;
- signal generating means comprising, rectifier means for rectifying an output from said AC power source, a first control element responsive to a signal of a predetermined level from said rectifier means for generating an output signal, a charging and discharging circuit connected to said first control element, and a second control element conductively controllable in response to the output signal from said first control element and a discharged output from said charging and discharging circuit, said signal generating means generating a control signal in response to an output from said second control element when the absolute value of said AC power source rises from a zero potential;
- and
- means for controlling the supply of power from said AC power source to said load in accordance with the control signal generating in said signal generating means, the supply of power being made in synchronism with a substantial potential of said AC power source.
Dependencies are inferred from the claim text.