Automotive high-intensity discharge lamp electronic ballast
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Metal halide high-intensity gas discharge lamp, commonly known as HID, can be applied to many fields, especially in automotive lighting, which can effectively reduce accidents and benefit people. The existing low-voltage HID electronic controllers are generally old and bulky. There are many components, fewer functions and protection functions, less security and reliability, and inconvenient installation and use.
1) When using the test or test test, if the "+, -" polarity is reversed, or because the car in some parts of the world is positively grounded, the car wire burns easily, and the controller will catch fire and burn the controller seriously. Because this product has a reverse protection circuit;
2) When the power supply or the car is powered, the voltage of the whole vehicle rises due to the instability of the voltage regulator or the battery capacity is reduced, and it is easy to burn. When the user stops the generator, but forgets to turn off the light, the battery is nearly exhausted, the voltage drops, and the next car Lack of sufficient voltage when the engine starts;
3) Since the ignition voltage is as high as 23KV at the time of starting, there is a danger of flashover when the bulb is burned out or damaged, and when the output wire is disconnected or broken, and when the bulb is not installed, it may cause fire in the car or The person inside the car was injured, and some users accidentally damaged the output line during installation, causing a short circuit, which would burn out and blow the fuse;
4) The bulb is unstable when the bulb starts to age or has different brands of bulbs and there are more obvious parameter errors.
The purpose of this design is to provide an electronic controller for high-intensity gas discharge lamps that is easy to install, safe, reliable, and fully functional.
The technical solution (Fig. 1) is: a booster, an A/C converter and a high voltage ignition connected in turn behind the DC power supply, and the output of the high voltage ignition is connected to the HID high intensity gas discharge lamp, and the DC power supply and the boost are provided. A reverse protection circuit is provided between the devices.
The electronic controller of the high-intensity discharge lamp further comprises a control protection module comprising a switch tube, a pulse width modulator and an undervoltage and overvoltage protection circuit, wherein the primary coil of the booster is connected in series with a switch tube, the switch The control end of the tube is connected to the output end of the pulse width modulator, and the input end of the undervoltage and overvoltage protection circuit is connected to the output end of the DC power supply for sampling, and the output end of the undervoltage and overvoltage protection circuit is connected to the input end of the pulse width modulator .
The control protection module further includes an open circuit short circuit protection circuit. The input end of the open circuit short circuit protection circuit is connected to the output end of the booster for sampling, and the output end of the open circuit short circuit protection circuit is connected to the input end of the pulse width modulator.
The control protection module further includes a ballast tracking circuit that performs voltage sampling from the output of the booster and current sampling from the A/C converter, and the output of the ballast tracking circuit is connected to the pulse width The input of the modulator.
And a filter network is arranged between the DC power supply and the booster, between the A/C converter and the high voltage ignition, and the output end of the DC power supply is connected to the power indicating circuit.
This design has the following advantages:
But when the voltage is reduced, it will automatically restart. When the user stops the generator, but forgets to turn off the light, when the battery is nearly exhausted, the voltage will be automatically de-energized to ensure that the battery can save enough energy for the next engine start, some use When the light is turned on to start the generator, since the starting motor suddenly consumes a large amount of current, causing the battery voltage to decrease, it will be protected and turned off. When the generator is started, the voltage returns to normal, and the line will resume normal operation immediately. .
When the lamp burns out or breaks and cannot be lit, and the output wire is disconnected or damaged, and there is no risk of flashover when the lamp is installed, it may cause fire in the car or people in the car may be injured. The open circuit short circuit protection circuit automatically cuts off the power when open circuit, short circuit and leakage.
When the power is turned on, the LED automatically lights up, and after the power is turned off, the LED is extinguished, which is more intuitive and convenient to use.
As shown in the circuit block diagram, the line includes a booster 2, an A/C converter 3 and a high voltage ignition 4 which are sequentially connected behind the DC power supply 1, and the output of the high voltage ignition 4 is connected to the HID high intensity gas discharge lamp 5, A reverse protection circuit 6 is further disposed between the DC power supply 1 and the booster 2. The circuit of the present invention further includes a control protection module including a switch tube 8, a pulse width modulator 9, and an undervoltage and overvoltage protection circuit. 10, the primary coil of the booster 2 is connected in series with a switch tube 8, the control end of the switch tube 8 is connected to the output end of the pulse width modulator 9, and the input end of the undervoltage overvoltage protection circuit 10 is connected to the DC power supply 1 The output end is sampled, the output end of the undervoltage overvoltage protection circuit 10 is connected to the input end of the pulse width modulator 9, and the control protection module further comprises an open circuit short circuit protection circuit 7, and the input end of the open circuit short circuit protection circuit 7 is connected to the booster 2 The output end is sampled, and the output end of the open circuit short circuit protection circuit 7 is connected to the input end of the pulse width modulator 9. The control protection module further includes a ballast tracking circuit 12, and the ballast tracking circuit 12 is performed from the output of the booster 2. The current sampling is performed on the A/C converter 3, and the output of the ballast tracking circuit 12 is connected to the input end of the pulse width modulator 9. The circuit further includes a power indicating circuit 13, a power indicating circuit 13 and a DC power supply. The output of the power supply 1 is connected, and a filter network is provided between the DC power supply 1 and the booster 2, between the A/C converter 3 and the high voltage ignition 4.
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