Simple range hood tap control switch
Jane Summer Soot, Gansu Zhang Xiaodong At present, the panel uses the membrane button of the range hood to use 0,05 integrated circuit or special single-chip thyristor terminal regulator and other control circuit, the circuit is complex and cost. To this end, the author used a new type of relay with auxiliary contacts and a switch-type tact switch to design a simplified light touch control switch, the cost is 10 yuan lower than other circuits of the same function. Due to the use of fewer components, the failure rate is correspondingly low; the anti-interference is strong, the reliability itself consumes less electricity, and the actual measurement is only about 0.7. After the shutdown, the power transformer is not included. There is no static power consumption. The range hood is lightly touched. The circuit of the switch is attached. In order to illustrate the working principle, the motor 1 bulb and fuse of the controlled object, etc., the relay with the auxiliary contact, and the conversion type tact switch 53383 are formed to form a cross-controlled interlock switch for controlling the oil absorption. The hood motor is on the river.
The running speed is slow and stop; the crystal pole tube 10384 and the like constitute a one-button bistable switch for controlling the lighting of the range hood illumination lamp. The power supply circuit is composed of a power transformer 1 rectifier tube å©6, å©9 and a capacitor 02, and converts the 220V AC mains into a DC power of about 12V for the control circuit to work.
Normally, the relays Kl, K3 are in the release state, the motor M does not run due to power failure, and the bulb does not light. When the tact switch 381 is pressed, the relay is energized, and the common contact K11 is closed to turn on the power supply circuit of the motor M, so that the M is energized to operate at a high speed; at the same time, the auxiliary contact, 2 is closed, so that The 1 coil constitutes a new power supply loop through the 耵 2582, and the 0 remains in the closed state after the 581 is reset. When 582 is pressed, the power supply circuit of the relay 1 is cut off, released, the motor is powered off, and the high speed operation is stopped. On the other hand, the relay K2 is electrically connected by SB2, so that the normally open contact K2l is turned on, and the M power is at a slow speed. Operating status. At the same time, the auxiliary contact, 2 is closed, so that the coil passes through 22581 to form a new power supply circuit, and after the 582 is reset, the crucible remains in the closed state. When the 383 button is pressed, the relay or 2 that is being pulled in is immediately released, and the motor is also powered off and stopped. When the yang 4 is pressed in the light of the range hood, the capacitors 01 at the ends of the capacitor 01 are fully charged. The voltage is connected to the base of the pole tube 71 so that the 1 is turned on, the relay is electrically connected, and the power supply circuit of the bulb 1 is turned on by its normally open contact to make it energize and illuminate. At the same time, the auxiliary contact K32 is also attracted, and the current limiting resistor R5 provides a bias current for the VT, so that the ruler 3 remains in the closed state after the 584 is reset. When pressing 584 again, since the voltage of both ends of Cl is different, lv can not be abruptly changed, so v instantaneously loses the proper bias voltage of about 0,65V and cuts off, K3 is powered off, because K3l disconnects and cuts off the H power supply circuit, so that power is cut off. Extinguished; because 2 is disconnected and cut off, the bias circuit of 1 keeps the off state unchanged after 384 reset. As a result, each time the secondary element 4 is pressed, that is, the light-off state of the secondary H is changed.
In the circuit, the light-emitting diodes 003 and the respective current-limiting resistors are only connected in series with the relays, and the two ends are connected in parallel, and they follow the corresponding relays in a fast or slow speed and the light-off state of the light bulb H. VD4 and shunt resistor R4 are connected in parallel and then connected in series with the control circuit of motor M, which can visually show whether motor M works or not.
Component selection 耵, select domestic small shell type 30 electromagnetic relay with auxiliary contacts, 58584 select 耵123 type conversion type light touch switch. The most important feature of the 30-type relay is that it can control the coil self-protection or the signal level output with the auxiliary contact. The main contact controls the load, and the double-conversion contact relay is smaller and cheaper than the same condition. The primary input AC voltage 220, the secondary output AC voltage 12, and the power of 1.5 are selected. Requires long-term reliable operation. Transistor 1 selects 9014 or 3068, which requires 150.
The printed circuit board that makes and uses the control switch does not include the power supply circuit. The actual size is about 0130. When soldering, pay attention to the light-emitting diode å©å¯4 and the light-touch switch 584 should be soldered on the copper foil side of the circuit board so as to be in the oil smoke. Fixed installation on the machine control panel.
The finished control switch board can be put into use without any debugging. It can be directly used as a matching component of the manufacturer of the range hood, or can be directly used to modify the existing range hood of the household. The control switch board is directly installed on the plastic printing film of the exterior of the range hood of the hood to be modified. Then follow the attached circuit and connect with the controlled device through multiple strands of wire. For purchase, Yu
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