Partly. With the production of radio remote control lighting switch Chen Youqing This article introduces a simple and practical radio remote control lighting switch, press the transmitter button, the light is on and press again, the light is off, it is very convenient to use.
Circuit principle The radio remote control lighting switch is illuminated by two parts of the radio transmitter and receiver.
A micro-radio transmitting and receiving module paired with.
Normally, the foot outputs a low level. When the transmitter button is pressed, the foot of the 2 pin output is released, and the foot returns to a low level.
Therefore, each time the foot is pressed, a count pulse is input through the end, and the 4 side is again occupied.
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It can be seen from the above analysis that if the even output group and the odd output group of the switch are repeatedly pressed, the high level and the low level appear alternately.
When one of the odd output groups has a high level, the electric light is composed. The circuit is as shown in the figure. The transmitter uses only one micro radio transmitter module receiver. The micro radio receiver module decimal counting distributor digital integrated circuit and The thyristor switch circuit is composed of several parts.
A simple capacitor step-down half-wave rectification regulator circuit is formed in the receiver and the like, and the left and right DC voltages are output for use in the entire circuit.
The odd output Q is connected to the left end of the resistor through a diode.
When any one of the odd output terminals outputs a high level, the high level is applied to the base of the triode to be turned on, and the thyristor can be turned on by obtaining a forward trigger current, and the lamp is turned on. It is lit.
The even outputs are not left open.
The power-on reset circuit constituting the switch, when it is energized, the positive pulse is obtained, the counter is reset, the output is high, and the other outputs are low, so the triode is turned off, the thyristor is turned off, and the lamp is not lit. When one of the even output groups has a high level, the non-trigger current is turned off when the AC power crosses zero, and the light is turned off.
Therefore, pressing the transmitter button can easily control the lighting of the light.
The component selection and fabrication and use of the paired micro-radio transmitter module and the receiver module use a 17-type decimal counter distributor digital integrated circuit.
The use of plastic small bidirectional thyristors, such as the type, can control the following incandescent bulbs.
The use of a type of silicon triode, wife 1 to use a Zener diode, such as a type.
A type of polypropylene capacitor is required.
Other components have no special requirements, only small size and reliable quality.
The three sets of windings are rectified and supplied in series, and the voltage adjustment is also done by Q.
This electronic input voltage multi-stage switching can prevent the loss of the adjustment tube due to the output of low voltage and large current, and does not need to use a very large heat sink, which can reduce the cost and reduce the volume of the entire power supply.
The operational amplifier and the 17 and the current sampling resistor form an output current limiting circuit. The current regulating potentiometer provides a reference voltage for the in-phase input terminal. When the output current exceeds the set value, the input voltage of the inverting terminal is greater than the non-inverting terminal, and the output is low. Flat, such an emitter output potential then drops, causing the conduction to weaken, or even tend to cut off, the output current is limited to the set value.
Adjust the current adjustment potentiometer to make the output current continuously set.
When the output terminal is short-circuited, the upper voltage drop is increased, the partial pressure of the voltage is made to saturate the Q, and the collector is weakened by the conduction control Q, so that the short-circuit current is maintained no more than the short-circuit current (output current). Used as a voltage comparator, when the regulator is output normally, it outputs a high level and lights up. When the constant voltage indicates that the output current reaches the set value or the output is short-circuited, the output is low level, and the light is turned on for constant current indication.
One is a socket for each connection cable, and the output terminal is connected to a digital voltmeter for visually indicating the output voltage.
The output is also connected to the digital voltmeter. Since the voltage signal is taken from the current sampling resistor, the output current is actually displayed.
When this kind of regulated power supply is designed, its small signal part is output positive (the ten is the reference grounding, so it actually constitutes the floating regulated power supply circuit.
Under normal circumstances, after the regulated power supply is fabricated, it is only necessary to fine-tune the output voltage and current readings to match the standard instrument indication.
A large power tube should be mounted on a suitable aluminum heat sink. The voltage and current adjustment potentiometers should preferably use an imported precision multi-turn potentiometer with a locking device and scale indication.
Electronic World Officials, an experimental and production pigeon, Chen Jingyu's curtains are essential for occasions such as the conference room office of the Family Hotel's cinema hotel, but the use of electric curtains is rare in these occasions.
The main reason is that the existing electric curtain frames are mostly driven by a rotating electric motor. The curtain opening and closing requires a set of deceleration and transmission mechanism to change the rotary motion of the motor into a linear motion, which inevitably complicates the structure of the curtain frame. The failure rate is high and the popularity is limited.
The series of electric curtains described in this article are different. It uses a linear motor to directly drive the curtain fabric to run, eliminating some intermediate transmission links, making the mechanical failure rate of the curtain frame almost zero even in the event of power outages, etc. In case of accident, you can directly open and close the curtains without affecting the use of curtains. This is an unparalleled advantage of other types of electric curtains.
A linear motor is a motor that can perform linear motion.
In general, any type of rotary motor, such as a synchronous motor of a DC motor synchronous motor and a stepping motor, has a linear motor corresponding thereto.
There are many types and structures of linear motors, and asynchronous linear motors are ones in which the structure is relatively simple.
The series of electric curtains adopts a single-phase asynchronous linear motor, which works in the same way as a three-phase asynchronous linear motor.
In order to facilitate the description and understanding, the three-phase asynchronous linear motor is taken as an example to illustrate its working principle.
The schematic diagram of a common three-phase asynchronous motor, the rotational speed of the rotating magnetic field generated when the stator winding is connected with three-phase alternating current is that the rotor bar is cut by the rotating magnetic field to form a current and generate a magnetic field, which is driven by the electromagnetic torque in the air gap and rotates the magnetic field along the stator. The direction is rotated at a speed lower than the rotational magnetic field speed.
If the stator and the rotor are respectively flattened, the traveling magnetic field shown in Fig. (b) can be obtained, and the traveling magnetic field cuts the rotor which is developed into a plane, generating induced potential and current, and the current and traveling magnetic field The action produces an electromagnetic force that causes the planar rotor to move in the same direction as the traveling wave magnetic field at a lower speed than the traveling magnetic field.
This is the basic principle of a three-phase asynchronous linear motor.
Linear motors and rotating motors have significant differences in mechanical structure and motion patterns.
For this reason, a portion of the linear motor corresponding to the stator of the rotating motor is generally referred to as a primary side, and a portion corresponding to the rotor is referred to as a secondary side.
The actual asynchronous linear motor is usually in the form of a short primary side and a secondary side. Since the primary side is to be provided with a field winding, the short primary side can be used to reduce the cost.
In this paper, based on the application of linear motors on curtain frames, sometimes for the sake of description, the primary side is called the motor, and the secondary side is called the track. In essence, the entire curtain frame is a truly complete straight line. Electric motor.
A linear motor used in an electric curtain frame is a tubular structure.
The picture shows a four-pole rotating motor that is unfolded and then along a square structure perpendicular to the traveling wave magnetic field.
At this time, the magnetic potential established by the three-phase winding through the three-phase alternating current is a magnetic potential that moves linearly at a speed along a phase sequence in the figure, and the magnetic field that is established is called a process of winding into a tubular shape.
The stator core and the winding of the rotating asynchronous motor are continuous along the circumference of the stator. After being disconnected, the magnetic field leaking at both ends of the core is closed by the air gap, so that the so-called fringe magnetic field appears. In addition, the primary side and the secondary side of the linear motor are generally The gap is large, which makes the linear motor's power factor low and the efficiency is not high, which is a common problem of linear motors.
However, when the linear motor is used for the electric curtain frame, the above shortcomings are not concealed due to the short working time and the small number of times.
The overall structure of the electric curtain frame using a linear motor is shown in the figure.
Four fasteners cooperate with the expansion bolts of the pre-punched wall or roof, and the two rails are fixed above the window. Depending on the size of the window and the sag of the curtain, the overlapping portions of the two rails are adjusted to make them in the curtain. There is no gap after closing.
For small windows, a single track single motor can also be used.
The linear motor applied to the curtain frame is tubular, and its structure is as shown in the figure. It consists of a casing cover and a secondary side of the motor.
The inner diameter of the outer diameter is long and the secondary side has an air gap around the primary side and the secondary side.
The secondary material of the motor has a special structure, such as drunk, and two sands. The second picture shows the printed circuit board of the lighting switch receiver. All the components except the printed circuit board size 80 are electrically soldered. Block homemade circuit board.
The prepared circuit board can be installed in a plastic case of a suitable size.
The transmitter is very simple and does not require a separate board. A small, lock-free, touch-button switch can be used.
For two AA batteries, install them in a plastic case.
It should be noted that the box of the transmitter and receiver must be made of non-metallic materials. Metal boxes cannot be used. Otherwise, the radio waves will be shielded and affect the use.
This lighting switch uses a dedicated integrated module and is not used for any debugging. It can work normally when powered on.
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