2results about How to "Reduce capacitive effect" patented technology

The application discloses a bipolar square wave excitation generation and conductivity detection circuit, a direct current bias square wave generation circuit can generate direct current bias square wave excitation signals with different frequencies; a direct current bias generation circuit generates a direct current voltage excitation; the direct current bias of the direct current bias square wave is equivalent to the size of the direct current voltage, and two signals are superposed to form a bipolar square wave excitation signal. An internal reference voltage output by an ADC is used as a voltage source of the direct current bias square wave generation circuit and the direct current bias voltage generation circuit; a node voltage of an ADC acquisition circuit is collected, so that the conductivity and temperature of a medium to be measured are obtained. The excitation and detection mode provided by the application ensures that all circuit voltages are positive voltages, simplifies the structure of the excitation and sampling circuit, is high in measurement accuracy, stable in measurement, low in power consumption and capable of meeting long-term online monitoring requirements.

The present application relates to a kind of brushless external electrostatic discharge ring electrostatic powder rotary cup spray gun device, including electrostatic powder spray gun body, non-metallic insulating rotary distributor assembly, electrostatic discharge ring, drive unit for driving rotary distributor assembly rotation, and for providing high-voltage static for electrostatic discharge ring high-voltage static generation unit.First, cancel the metal part design of rotary distributor assembly, substantially reduce the capacitance effect of metal part in rotary distributor assembly itself, eliminate the phenomenon of striking fire generated in the spraying process of traditional metal rotary distributor assembly, improve safety.Both can prevent carbon brush from mixing carbon residue into powder during rotation and friction process to pollute powder, and can also reduce the cost of frequent replacement and maintenance of carbon brush, so as to reduce the use cost of spray gun.