JPH0220943U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 shows the configuration of an embodiment of the single-phase phase control circuit of the electrostatic precipitator according to the present invention, Fig. 2 is an explanatory diagram of its waveforms, and Fig. 3 is a schematic diagram of the electrical system of the electrostatic precipitator according to the present invention. The explanatory diagram, FIG. 4, shows a conventional single-phase phase control circuit diagram. In the figure, 11 is a DC converter, 12 is a DC-DC converter, 13 is a DC-AC inverter, 14 is a rectifier, 15 is a discharge electrode, 16 is a dust collection electrode, 17 is a fan motor, and 18 is a single-phase phase control circuit, 21 is a lamp voltage generation circuit section, 22 is a rotation speed setting circuit,
23 is a comparison circuit section, 24 is a gate circuit, 25 is a thyristor, 33 is a precipitator operation display circuit, 34 is a step switch circuit, 35 is a threshold voltage generation circuit, 36
Reference numeral 50 represents a rotation speed display circuit, and 50 represents a step switch.

Claims (1)

[Claim for Utility Model Registration] Converting a commercial AC power supply to DC using a DC converter, obtaining high voltage DC using a DC-DC converter, and converting the high voltage DC voltage to high frequency AC. In an electrostatic precipitator configured to apply a high DC voltage between a collecting electrode and a discharge electrode by converting the voltage to direct current again, the fan motor is driven by a commercial AC power source; A thyristor that controls the phase of the AC voltage supplied to the motor and a DC converter that supplies DC voltage to the DC-DC converter convert the lamp voltage, which is synchronized to the phase of the AC voltage applied to the fan motor, into positive and negative signals. a lamp voltage generating circuit section that generates respective AC voltage waveforms for each of the AC voltage waveforms; a comparison circuit section that outputs respective outputs when the lamp voltage becomes larger than an arbitrarily determined threshold voltage; A rotation speed setting circuit that determines the rotation speed of the fan motor, and a gate circuit that conducts the thyristor based on the output of the comparison circuit, and the rotation speed setting circuit adjusts the rotation speed of the fan motor each time the step switch is pressed. a step switch circuit that generates a step signal for changing the speed; and the threshold value at which the rotation speed of the fan motor should be sequentially switched from zero to high speed for each step signal inputted from the step switch circuit. A threshold voltage generation circuit that generates a voltage, a rotation speed display circuit that displays the rotation speed of the fan motor in accordance with the threshold voltage generated by the threshold voltage generation circuit, and a step switch of the step switch circuit. The DC converter is configured to operate the dust collector by the operation of , and is equipped with a dust collector operation display circuit that displays when the dust collector is in operation, and supplies the DC-DC converter to the DC-DC converter. An electrostatic precipitator characterized in that the conversion voltage of the fan motor is used to control the rotational speed of the fan motor, its rotational speed is displayed, and the operation of the precipitator is controlled by a step switch.