the inverter is a DC power (battery, storage battery) into an alternating current (typically 220V, 50Hz sine wave) device. It consists of inverter bridge, and filter control logic circuit. Widely used in air conditioners, home theater, electric grinders, power tools, sewing machines, DVD, VCD, computers, televisions, washing machines, range hoods, refrigerators, VCRs, massage, fans, lighting and so on. In foreign countries due to the high penetration rate of car travel to work or inverter connected to a battery driven appliances and tools work. Car inverter output through the cigarette lighter is 20W, 40W, 80W, 120W to 150W power specifications. Then larger power inverter to be connected to the battery via the connection line. The appliances connected to the output terminal of the power converter can be used in all kinds of electrical vehicles. Appliances can be used are: mobile phones, laptop computers, digital cameras, cameras, lighting, electric shavers, CD players, game consoles, handheld computers, power tools, car refrigerator and a variety of travel, camping, emergency medical treatment appliances Wait.
1 inverter works
InverterDevice is a DC to AC transformer, which is in fact a process with the conversion of voltage of the inverter. The inverter is a converter into the AC network steady 12V DC output, while the inverter output is Adapter 12V DC into a high frequency high voltage alternating current; the two portions of the same are used with more than pulse width modulation (PWM) technique. Which is a core part of an integrated PWM controller, Adapter used is UC3842, the inverter is used TL5001 chip. TL5001 operating voltage range of 3.6 ~ 40V, which is provided inside an error amplifier, a controller, an oscillator, with a dead-time control of the PWM generator, low voltage protection circuit and short circuit protection circuit and the like.
Input interface section: an input portion having three signals, 12V DC input VIN, the working voltage of the enable signal ENB and the current control Panel DIM. VIN provided by the Adapter, ENB voltage provided by the MCU on the motherboard, a value of 0 or 3V, when ENB = 0, the inverter is not working, whereas when ENB = 3V, the inverter in a normal operating state; and DIM voltage provided by the motherboard, which range between 0 ~ 5V, DIM different values fed back to the feedback terminal of the PWM controller, the inverter current supplied to the load will be different, DIM smaller the value, the inverter output current It will be.
voltage start circuit: ENB is high, the inverter output to the high-pressure lamp lighting backlight Panel.
PWM controller: has the following functions: internal reference voltage, an error amplifier, oscillator and the PWM, overvoltage, undervoltage protection, short circuit protection, output transistors.
DC converter: a MOS switch and inductor voltage conversion circuit consisting of a pulse input after the driving MOS transistor push-pull amplifier as switching operation, so that the DC voltage to charge and discharge the inductor, the inductor on the other end so that AC voltage can be obtained.
LC oscillation circuit and outputs: lamp starting voltage 1600V to ensure required, and after starting the lamp voltage down to 800V.
Feedback Output voltage: When the work load, the voltage feedback samples, I play a role in stabilizing the output voltage of the inverter.
2. The inverter action
is the inverter DC power (battery, storage battery) into an alternating current (typically 220v50HZ sine or square wave). Popular speaking, the inverter is a direct current (DC) into an alternating current means (AC) of. It consists of inverter bridge, and filter control logic circuit. Widely used in air conditioners, home theater, electric grinders, power tools, sewing machines, DVD, VCD, computers, televisions, washing machines, range hoods, refrigerators, VCRs, massage, fans, lighting and so on. Briefly, the inverter is a kind of low-voltage (12 or 24 volts or 48 volts) DC into the electronic device 220 volts AC. Because we usually 220 volts AC into DC rectifier to use, and the role of the inverter contrast, hence the name. We are in a “mobile” era, mobile office, mobile communications, mobile entertainment and leisure. In a moving state, people need not only low-voltage DC supply by the battery or batteries, but also an integral part of our daily needs environment 220 volts AC inverter to meet this demand us.
3. The inverter characteristics
.
1 high conversion efficiency, fast start;
2 good safety performance: product includes a short circuit, overload, over / undervoltage, over-temperature five kinds of protection;
3 good physical properties: product is All aluminum shell, thermal performance, hard surface oxidation treatment, good abrasion performance, and anti-extrusion or hitting a certain external force;.
4-load adaptability and stability
4. the inverter efficiency
in operation the inverter itself also consume part of the power, and therefore, its input power is greater than its output power. Inverter efficiency that is the ratio of the inverter output power to input power, i.e., the inverter output power efficiency than the input power. If a station 100 watt inverter input DC, AC output 90 watts, then its efficiency is 90 percentage.