验 AC and control, low-voltage lighting power supply phantom microcontroller programming program box 4.
North China Petroleum Vocational School Research Institute 062552 Huang Shaoye Wei Yanhua Du Liyi oilfield drilling underground oil and other construction sites, due to safety needs often, using AC 36 low-voltage lighting.
Such a power source, each of which can carry 220, 36 bulbs, the output power is not less than 1200, because the input voltage is unstable, often caused by overvoltage, the bulb is damaged, or the transformer is overheated due to long time high current operation. The power supply is damaged. If the transformer output voltage is designed too low, it will cause insufficient brightness of the bulb and affect the lighting. After years of practice, we have trial-produced a kind of low-voltage lighting power supply with 15 single-chip microcomputer control, which has no such shortcomings.
1 design idea 0 power supply change; device input voltage is 22, 1 secondary coil design, 3628 two sets of taps; after the power is turned on, output 2 muscles in 30 seconds, preheat the bulb, and then output 36 normal illumination; When the input voltage is too high, the output is switched to 28 taps to prevent the current from being too large and causing damage to the bulb and power supply. When the jade is normal or low, the output returns to the 36-tap 2 circuit. The main circuit of the main circuit 1. When given When the bulb is warmed up or the output voltage is too high due to the input voltage being too high, the AC contactor 1 is closed, and when normal, the AC contactor 20 is closed.
The AC contactor 42 of the main circuit of the control circuit is controlled by a single-chip microcomputer, and the circuit 2. The voltage detection signal is input by 105885. When the input voltage is too high, 1 is low level, and when the voltage is normal or low, 1 is high level. 6 is two outputs, and the intermediate relay 120 is controlled by the switch tube 12 respectively.
When 7 is high level and the anode is low level, the saturation is turned on, 1! Pull in; conversely, 2 to attract. In order to make the switch tube work normally, the potentiometer 12 can be adjusted, if necessary, to 82.1! 2 to control 1012 respectively, in order to avoid 1 to simultaneously pick up, interlock with their normally closed contacts. Circuit 3.
4 Voltage detection circuit The detection circuit adopts a current detection method, and the circuit 5. The output of the mutual inductance coil 01 is rectified and filtered, and the switch tube is controlled. The collector output detection signal is connected to the single chip microcomputer. When the input voltage is too high, the saturation is turned on and the output is low; when the voltage is normal or low, 1 is off and the output is high. Adjust 1 and ruler 1 appropriately to work properly.
3 use effect The power supply has been used for many years and the effect is good.
When the input voltage is too high, the bulb can also emit light normally, and the damage rate of the power source and the bulb is greatly reduced. When the voltage is low, the brightness of the bulb is worse, but it can also be achieved by using the broken excitation and de-energizing. When the motor is out of step, the trigger pulse is stopped immediately, the excitation contactor control loop and the excitation ± loop are disconnected, and the motor enters the asynchronous drive state. Reasonable selection of the de-excitation resistor can improve the asynchronous drive characteristics, and the motor speed will rise. After entering the critical slip, the device automatically controls the excitation system, and the motor is fully stepped according to the accurate excitation, so that the motor returns to the synchronous state, 2.2. 21 following the characteristics of the excitation screen. 1 The motor starting process is smooth and fast, eliminating the pulse vibration phenomenon existing in the starting process of the original equipment motor.
The device has high reliability, stable DC excitation output, and an automatic phase balance system, which eliminates the frequent instability of the original device, and the unbalanced phase loss and loss of the connector.
The device adopts a thin film panel switch to adjust the excitation voltage, and is divided into a rising key down key and a quick key, which changes the function of the original device using the potentiometer to adjust the excitation, and has the functions of good out-of-step protection and automatic re-stepping with load, and the whole process Smooth and fast, it only takes a few seconds to be accurate and reliable, does not harm the motor, does not need to reduce the load, and has a backup protection link, so that the electrical equipment meets the production requirements for continuous and stable process characteristics.
The device has a complete signal finger system, which uses microcomputer technology to control the whole process, so that the device has multiple functions, easy operation and low failure rate.
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