First, the main dimming technology of LED lamps
The first mode of dimming is to achieve dimming of the LED lamp by adjusting the LED driving current, because the brightness of the LED chip is proportional to the LED driving current.
The second type of dimming is often referred to as analog dimming or linear dimming. The advantage of the dimming mode is that when the driving current is linearly increased or decreased, the influence of the driving current overshoot on the LED chip is relatively reduced, and the control circuit has strong anti-interference. The disadvantage is that the magnitude of the drive current will have a certain effect on the color temperature of the LED chip.
The third mode of dimming is pulse-light modulation (PWM). In this way, the driving current is square wave-shaped by a certain control, and the pulse width is variable. The pulse width is adjusted to change the time during which the LED lamp is continuously lit, and the output power is also changed, thereby achieving the purpose of energy saving. The frequency is generally controlled at 200 Hz to 10 kHz. Due to the retention of human eye vision, the flicker of the light source during the dimming process is not felt. The advantage of this dimming method is that it can improve the heat dissipation of the LED. The disadvantage is that the overshoot of the driving current has a certain influence on the life of the LED chip.
The above three dimming methods are classified according to the control of the LED drive current output terminal. The control circuit can also be divided into analog control and PWM control, and the control circuit is usually realized by a microcontroller.
Second, the composition and future development of the dimming system
Perfect intelligent control should have manual control, intelligent control, light control, time control and fault alarm control functions. When the sun goes down, the sky will automatically light up. After 12 o'clock in the morning, the illumination of the lamp can be automatically halved. After dawn, the lamp can be automatically extinguished; in special cases, the person can manually control; in the event of a malfunction of the lamp, the control system Can automatically alarm.
The intelligent dimming system is mainly composed of a server, a central controller, a single-chip controller and a signal detection circuit.
Server: It consists of upper computer and upper computer software, mainly realizes monitoring operation and alarm function. The server is located in a control center such as street lamp management, and its connection with the central controller can be by power carrier, network or wireless.
The central controller is responsible for accepting the signal sent by the server, decoding it and sending it to the unit controller for control, and transmitting the result of the signal detection to the server.
Signal detection circuit: detects ambient brightness, drive power supply voltage, and current. The detected signal is sent to the unit controller or the central controller.
Unit controller: Each LED light is equipped with a unit controller. By receiving the command of the central controller, the LED is dimmed or turned on and off, and the driving voltage and current of the LED light are sent to the signal detection circuit. Central controller. The fault signal is transmitted to the central controller when the LED luminaire fails.
At present, in the field of road lighting, the application of LED is rapidly spreading, and long life and reliability are still the first elements considered at present, but with the development of technology, when the problem of life and reliability has been solved to some extent, LED Lighting applications must move forward toward intelligent dimming systems.
Source: Electronic Engineering World
Lock Motor product introduction:
Safe Lock Motor, also known as The anti-theft lock motor, in the field of electronic Lock technology, Safe Lock Motor is a mechanical Lock components associated with the electronic control unit of the important parts.
Functions: it is widely used in various intelligent locks, such as Shared bicycle lock, fingerprint lock, glass lock, safe lock, hotel lock, family lock, inductive smart lock, etc
Features: Motor For Safe Lock is based on micro precision reducer development, small intelligent micro precision reducer can do 10 mm in diameter, is widely used in safe, locks, smart locks, sensor intelligent lock;
This kind of motor has the characteristics of low noise, low energy consumption, small volume, light quality, high precision, large torque and durability
Method of use: the best stable in horizontal plane, installed on the Safe Lock Motor output shaft parts, cannot use a hammer to knock, knock prone to press into the dc Safe Lock Motor drive, may cause damage to internal components, and cannot be used in the case of blocked.
Operating temperature range:
Gear Motor For Safe Lock should be used at a temperature of -10~60℃.
The figures stated in the catalog specifications are based on use at ordinary room temperature catalog specifications re based on use at ordinary room temperature (approximately20~25℃.
If a Safe Lock Motor is used outside the prescribed temperature range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.Depending on the temperature conditions ,it may be possible to deal with them by changing the grease of the motor's parts.Please feel free to consult with us about this.
Storage temperature range:
Gear Motor For Safe Lock should be stored ta a temperature of -15~65℃.
In case of storage outside this range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.
Service life:
The longevity of Dc Motor For Safe Lock is greatly affected by the load conditions , the mode of operation,the environment of use ,etc.Therefore,it is necessary to check the conditions under which the product will actually be used .The following conditions will have a negative effect on longevity.Please consult with us should any of them apply.
â—Use with a load that exceeds the rated torque
â—Frequent starting
â—Momentary reversals of turning direction
â—Impact loads
â—Long-term continuous operation
â—Forced turning using the output shaft
â—Use in which the permitted overhang load or the permitted thrust load is exceeded
â—A pulse drive ,e.g.,a short break,counter electromotive force,PWM control
â—Use of a voltage that is nonstandard as regards the rated voltage
â—Use outside the prescribed temperature or relative-humidity range,or in a special environment.
â—Please consult with us about these or any other conditions of use that may apply,so that we can be sure that you select the most appropriate model.
when it come to volume production,we're a major player as well .each month,we rurn out 600000 units,all of which are compliant with the rohs directive.Have any questions or special needed, please contact us, we have the engineer group and best sales department to service to you
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