The working principle of inverter power supply
Inverter is the conversion of dc power (battery, storage battery) into alternating current (generally 220V, 50Hz sine wave). It consists of inverter bridge, control logic and filter circuit. Widely used in air conditioners, home theater, electric grinding wheel, electric tools, sewing machines, DVD, VCD, computer, TV, washing machines, smoke lampblack machine, fridge, video recorders, massager, fan, lighting, etc. In foreign countries, the use of inverter to connect batteries to drive electric appliances and various tools can be used in foreign countries because of the high penetration rate of automobile. The vehicle inverter with cigarette lighter output is 20W, 40W, 80W, 120W to 150W power specification. A few more power inverters must be connected to the battery. Electrical appliances can be used in the car by connecting home appliances to the output terminals of the power converter. Can use electrical appliances include: mobile phones, notebook computers, digital cameras, camera, lighting, electric shavers, CD players, game consoles, handheld computers, power tools, car refrigerator, and various kinds of travel, camping, emergency medical appliances, etc.
Adapter USES UC3842, and the inverter USES the TL5001 chip. The operating voltage range of TL5001 is 3.6 ~ 40V. It has an internal error amplifier, a regulator, oscillator, PWM generator with dead zone control, low voltage protection circuit and short circuit protection circuit.
Input interface part: the input part has 3 signals, 12V dc input VIN, work to enable voltage ENB and Panel current control signal DIM. VIN is provided by the Adapter, and the ENB voltage is provided by MCU on the motherboard, whose value is 0 or 3V. When ENB = 0, inverter does not work, while ENB = 3V, inverter is in normal working condition. And DIM voltage supplied by the main board and its change range between 0 ~ 5 v, different DIM value feedback to the PWM controller, inverter for the load current will also be different, DIM value is smaller, the greater the inverter output current.
Voltage start loop: ENB is high current, and output high voltage to light the backlight lamp tube of Panel.
PWM controller: there are several functions: internal reference voltage, error amplifier, oscillator and PWM, overvoltage protection, undervoltage protection, short circuit protection, output transistor.
Dc transform: composed of MOS switch tube and energy storage inductor voltage conversion circuit, the input pulse drive after a push-pull amplifier amplified MOS tube do switch action, makes the dc voltage to charge and discharge of inductance, so that the other end of the inductance can be ac voltage.
LC oscillation and output loop: ensure the 1600V voltage required for the lamp to be activated and reduce the voltage to 800V after the lamp is started.
Output voltage feedback: when the load is working, the feedback sampling voltage can be used to stabilize the voltage output of the I inverter.
Inverter is the conversion of direct current (battery, storage battery) into alternating current (usually 220v50HZ sine or square wave). In popular terms, inverters are devices that convert direct current (DC) into alternating current (AC). It consists of inverter bridge, control logic and filter circuit.
Widely used in air conditioners, home theater, electric grinding wheel, electric tools, sewing machines, DVD, VCD, computer, TV, washing machines, smoke lampblack machine, fridge, video recorders, massager, fan, lighting, etc.
In short, the inverter is an electronic device that turns a low pressure (12 or 24 v or 48 v) direct current into a 220 volt ac. Because we usually turn 220 volts ac current into direct current, the inverter does the opposite, hence the name. We are in a "mobile" era, mobile office, mobile communication, mobile leisure and entertainment. In a state of movement, people not only need to be supplied by batteries or battery low voltage direct current (dc), at the same time more in need of our indispensable in the daily environment 220 v alternating current (ac), inverter can meet the demand of our this.
1. High conversion efficiency and fast start-up;
2. Good safety performance: the product has short circuit, overload, over-voltage and over-voltage protection;
3. Good physical performance: the product adopts the whole aluminum shell, with good heat dissipation performance, the surface hard oxidation treatment, good friction performance, and can resist the extrusion or collision of certain external forces;
4. Strong adaptability and stability of load
The work efficiency
The inverter itself also consumes part of the power at work, so its input power is greater than its output power. The efficiency of inverter is the ratio of the output power of the inverter to the input power, that is, the inverter efficiency is the output power compared to the input power. For example, if a inverter enters a 100-watt dc and outputs a 90-watt alternating current, its efficiency is 90%.
1. Use office equipment (e.g. computers, fax machines, printers, scanners, etc.);
2. Use living appliances (such as game console, DVD, audio, video camera, electric fan, lighting lamp, etc.);
3. Or need to charge the battery (cell phone, electric razor, digital camera, camera, etc.);