| 摘要 |
The induction electric heater is used in the residential electrical equipment, in particular is the cooking stoves and radiators with induction heater of water and air. The elements of its structure and their connections enable to the automatic adjustment of the mode of operation, and maintaining constant the power fed to the heated object. The induction electric heater contains a controlled inverter (1) which includes , connected in series, unit (4) of current switches, circuit (5) of the inductor and unit (6) for the supply. Unit (4) is connected to unit (10) for controlling the voltage of the collectors of the current switches and with sensor (12) for determining the availability of a heated object which is connected to unit (16) for determining the pulsation level. The input of unit (16) is coupled to circuit (5) and to unit (6) connected to a primary source of electric supply (7). Sensor (21) for the load temperature is connected in series across unit (20) for controlling the power of a controllable setting generator (2) and power amplifier (3), connected to unit (4), which is mechanically connected to a second temperature sensor (18). Across unit (17) for connection, sensor (18) is coupled to unit (6) and to the first input of unit (11) for blocking the generator to the second input of which sensor (12) is connected, the first input of which is coupled to the first high voltage divider (9), the input of which is connected to unit (4). The second input of sensor (12) is connected in a common point, connecting the input of unit (13) for tuning the frequency of the generator connected to the second input of generator (2), the input of unit (14) for limiting the power, the output of the second high voltage divider (15), and the output of unit (16). The first output of unit (11) is connected to unit (19) or sound signalling, its second output is coupled to the second input of generator (2), and its third output is connected to the second input of unit (20).The first input of unit (11) is connected to the first output of sensor (21) for the temperature of the load, its third input being connected to unit (4) by interconnected in series of unit (10) and divider (9), and its fourth input being connected to the second temperature sensor (18) by unit (17). The input of divider (15) is connected to the input of unit (16) and with unit (6), and unit (14) is connected to the third input of unit (20). 1 claim, 4 figures
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