Water dispenser double sheet control circuit
Source: InternetPublisher:newrudeman Keywords: Control circuit BSP potentiometer Updated: 2021/12/20
Power circuit 1ZV DC stabilized power supply is transformed by transformer T, rectified by bridge rectifiers VD1-VD4, capacitors Ci, Cz and R9
form a shapeless filter, vS stabilizes the voltage to 12V. The positive pole of the power supply is ov, the negative pole is -12V and is connected to the chassis (ground wire). HL is the power indicator light.
C2) Circuit principle: Transistors VT1-VT3 and bias resistors form a three-pole direct coupling amplifier, relay KA1 is used for signal output,
EL is the light source bulb, and two silicon photovoltaic cells Bl and B2 are installed above and below it. Place a piece of sample paper in advance between the light sources EL and Bl
. Its thickness should be the same as the printing paper. Another silicon photovoltaic cell B2 is installed below the feeding paper board. At this time, the paper moving through the feeding paper board is the paper to be detected
. In the circuit, Bl and potentiometer RP form a detection bridge. When paper feeding is normal (no double sheets), the voltages generated by Bl and B2 are equal, but
with opposite polarities. At this time, the voltage between the sliding end of the potentiometer RP and the ground wire of the DC power supply is ov (if it is not 0, you can adjust RP to 0. When
the Ub of VTi is zero, VT1 is cut off, VT2 is turned on, and VT3 cut off, relay Kl loses power and is released. When two sheets of paper are fed, the photoelectric potential
generated by decreases, while the photoelectric potential on Bl remains unchanged, and a voltage is generated between the sliding terminal on RP and the ground, causing the base of VTI to The pole potential
Ubl is negative, and Ubel is a positive bias, causing VT1 to conduct. The arrow equation of the circuit change is lcl 11 Uci ox Ub2 + VT2 cut-off--Uc2 0-
Uh-VT3 conduction-Ie3.Kl pull-in. Kl causes the machine to generate voltage and "go upstairs" action. At the same time, the normally open contact of Kl and SQl keep
VT3 on. After the control function is completed, soi is disconnected by the touch pressure. VT3 is cut off and Kl is released.
(3 ) Debugging process In order to ensure the normal operation of the detection circuit, before changing the paper, the following debugging should be done: First, the paper pattern
fixed the same as the paper used for the single brush. Then put a piece of paper on the feeding paper board so that it is Between DAY. and B2, the relay Kl should
be released , otherwise RP needs to be adjusted until Kl is released. Then put the second sheet of paper on the first sheet (that is, a double sheet). At this time, Kl should be Pull-in
action, if not, you need to adjust the potentiometer RP to make Kl realize pull-in. At this time, the circuit adjustment is completed.
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