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Automotive rectifier
Automotive rectifier is a rectifier device, which simply translates AC into DC. It has two main functions: first, alternating current (AC) into direct current (DC), after filtering to supply load, or supply inverter; Second, to provide battery charging voltage. Therefore, it also acts as a charger. The purpose of automotive rectifier is to instantly provide electrical appliances with enough large current and stable voltage, 1~ 200 times per second of ignition, if the electronic ignition device can get enough current and voltage, gasoline combustion is more complete, to achieve fuel saving, so the effect of each car is not the same.
Introduction to the
Automobile rectifier is the direct current after the rectifier of automobile generator. The wave type of automobile rectifier has irregular fluctuation, which directly affects the accuracy of vehicle ignition. The output voltage can not maintain a relatively constant, resulting in each spark plug ignition of the energy difference is large easy to make your car engine shake, there is a shift, slow and weak speed, idle instability and low efficiency of car air conditioning and other situations. Thus greatly reduce the performance and service life of vehicle electrical equipment; Combined with the aging of the circuit system of the aged car, the influence of the circuit resistance pit becomes high, and the influence of your car becomes increasingly obvious. The role of electronic rectifier is to help the car eliminate clutter interference, stable output voltage, improve the instantaneous discharge capacity of the power supply system, increase torque output, speed up the throttle response, prolong the life of the battery, shorten the start time of the car engine, improve the ignition efficiency, especially for small displacement of the car, the effect is obvious.
role
Reduce idle shake and make it more smooth.
Improve the power, effectively improve the problem of rolling, towing, climbing acceleration weakness.
Stable voltage, reduce clutter interference, improve the life and performance of electrical appliances and improve the sound quality effect of car audio system.
Protect battery and original electric circuit system, reduce its load and prolong service life.
Cause analysis,
Why are car rectifiers needed
Batteries (lead-acid batteries) in the engine room are the car's sole source of electricity, from lights, air conditioning, sound... The electric ignition is powered by a battery, and the appliances used in these cars are connected to the positive and negative extremes of the battery.
The electric appliances used in the car are generally used in parallel as those in the home, but the load characteristics of each electrical appliance are not the same. When these battery-powered electrical appliances are started, they will produce different voltage stability results due to their different load characteristics.
In electronic ignition device, for example, if the car's engine rotating speed is 3600 RPM, conversion can get 60 RPS, that is to say under the speed of 3600 RPM, cells must provide 30 times per second, the electronic ignition current, in a four-cylinder engine, the battery must provide 120 times per second, electronic ignition current, at the same time, other appliances such as acoustics also need power supply, It will cause the actual voltage instability of the sound.
All the electrical equipment in a car is powered by batteries and generators. So you have to ask, battery output is already direct current, then rectifier filter what wave? Don't worry. Let's start with the generator. The generator driven by the automobile engine is composed of three groups of y-type stator coils, which generate three groups of ALTERNATING voltage with different phases, and then pass through six positive and negative bipolar rectifier crystals (rectifier particles) built into the generator. After full-wave rectification, it is converted into DC voltage. To supply the car's electrical equipment such as air conditioner compressor, audio, ECU, ignition coil, fuel pump and headlamp, etc. In other words, all electricity on the car is supplied by the generator, while the battery is purely a storage unit that converts electrical energy into chemical energy. Its in addition to the required to start the engine can supply power, and also has the response to heavy load power is larger, can undertake compensation function of the discharge at any time, so the battery itself is also has a certain voltage rectifying effect, and after after the generator rectifier dc electric wave type, still have some irregular fluctuations (so-called wave voltage), Cities in and out of traffic conditions, the degree of voltage instability has become increasingly obvious, if coupled with higher oxidation old circuit system, the influence of high resistance pit, are more likely to have accelerated the strength decrease, unstable idle speed and air conditioning compressor low efficiency and so on situation happened, and unstable voltage for electric equipment itself, It is also one of the causes of reduced life expectancy.
Just rely on the battery itself, therefore, the voltage stabilizing function, the effect is very limited, because the battery is composed of many is the cathode lead sheet by electrolyte combination collocation, its contact with the electrolyte area is not large, charge and discharge efficiency nature is limited, but make a dc voltage stabilizer, the cost too high (car total electricity maximum current is very big). Therefore, it is relatively simple and low-cost to use capacitor filter to improve the efficiency of stabilized rectifier (it does not have the effect of storing electric energy for a long time).
Capacitance of the internal structure consists of more than two layer of metal foil and dielectric combination and become, have fast charge and discharge, make up the shortages of the traditional battery efficiency effect, but the engine, generator power, no longer capacitance "temporary" power will be gradually released, so capacitance when surge in car load (open air conditioning, etc.) on the accelerator, can rapidly make up the required power.
The quality of an automotive rectifier is judged by its durability and whether the actual improvement in throttle response is obvious. Such as the internal circuit system and the shell of heat insulation, waterproof, anti-oxidation design (using heat insulation waterproof shell, imported high life large capacity capacitors, epoxy resin insulation circuit board, plastic wrapped wire, high durability/conductivity solder, etc.), is the biggest factor affecting whether the performance is lasting. And the adoption of the thickness of the wire, wire and connectors, is the determinant of the conductive performance merits or not, especially in the car under low voltage and high current electricity environment, wires must be fine and multi-fiber coupled with large cross-sectional area, can play the effect completely, so if you have Suggestions door in the installation of the rectifier with ground wire at the same time, the effect will be better.