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  • Place of Origin: Chongqing, China (Mainland)
  • Brand Name: EH
  • 12V: 10A

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Switching power supply products are widely used in industrial automation control, military equipment, scientific equipment, LED lighting, industrial equipment, communications equipment, electrical equipment, instrumentation, medical equipment, semiconductor refrigeration and heating, air purifiers, electronic refrigerator, liquid crystal display, LED lamps, communications equipment, audio-visual products, security monitoring, LED light bag chassis, computer, digital products and equipment in areas such as.Editor this paragraph of main types of modern switching power supply has two kinds: one is the DC switch power supply; another is the AC switching power supply.The internal structure of switch power supply

Here mainly introduce the only DC switching power supply, its function is to low quality of energy of the original ecological power (crude electric), such as a mains power or battery power, converting equipment to meet the quality requirements of the higher DC voltage (power).DC switching power supply is the core of the DC/DC converter.Therefore, DC switching power supply is dependent on DC/DC converter classification classification.That is to say, DC switching power supply converter classification and DC/DC classification is basically the same, DC/DC converter classification basically is a direct current switch power supply classification.DC DC/DC converter according to the input and output are electrical isolation can be divided into two categories: one category is the isolation of the known as the isolated DC/DC converter; another kind is not isolated called non isolated DC/DC converter.Isolated DC/DC converter can also according to the number of active power device classification.The single DC/DC converter has forward type (Forward) and flyback (Flyback) two.Dual DC/DC converter with double forward type (DoubleTransistor Forward Converter), dual switch flyback (Double Transistr Flyback Converter), push-pull (Push-Pull Converter) and type (Half-Bridge Converter) four.The four tube is DC/DC converter full bridge converter (DC/DC Full-Bridge Converter).Non isolated DC/DC converter, according to the number of active power devices, can be divided into single, double and four three class.The internal structure of the switch power supply

Single DC/DC converter has a total of six species, namely the buck (Buck) DC/DC converter, step-up (Boost), DC/DC converter boost Buck (Buck Boost) DC/DC converter, Cuk DC/DC converter, Zeta DC/DC converter and SEPIC DC/DC converter.In this six kinds of single DC/DC converter, Buck and Boost DC/DC converter is the basic, Buck-Boost, Cuk, Zeta, SEPIC DC/DC converter is derived from.Dual DC/DC converter with dual tandem booster (Buck-Boost) DC/DC converter.Four DC/DC converter is used in DC/DC full bridge converter (Full-Bridge Converter).Isolated DC/DC converter in the realization of the input and output electrical isolation transformer, is usually used to achieve, because the transformer with transformer function, so it is beneficial to expand the application range of the converter's output, and also to achieve a different voltage output by the multiplexer, or the same variety of output voltage.In the power switch tube voltage and current rating is the same, the power output of the converter is usually associated with the switch tube is proportional to the number of.So the number of DC/DC switch tube, the power output of the converter is greater than two, four pipe tube output power twice, single output power of only four tube type 1/4.Non isolated converters and isolation converter combination, can be a single converter does not have some characteristics.According to the energy transfer points, DC/DC converter has one-way and two-way transmission two.With two-way transmission function of DC/DC converter, can from the supply side load side transmission power, and also can be from the load side power supply side transmission power.The DC/DC converter can also be divided into self and his control type.The converter itself positive feedback signal to realize the switch tube self-sustained periodic switching converter, called a self-oscillating converter, such as Loel (Royer) converter is a kind of typical push-pull self-oscillating converter.He controlled DC/DC converter switching devices in the control signal, is provided by an external dedicated control circuit generates the.According to the switch condition, the DC/DC converter can be divided into hard switching (Hard Switching) switching power supply

And the soft switch (Soft Switching) two.Hard switching DC/DC converter switching device is in a withstand voltage or current situation, open or shut off circuit, therefore in the opening or closing process will produce a larger overlapping loss, the so-called switch loss (Switching loss).When the converter's working state when the switch loss is certain, and the switch frequency is higher, the switching loss is bigger, at the same time in the switch process will arouse circuit inductance and parasitic capacitance of the oscillation, bring additional loss, therefore, of hard switching DC/DC converter switching frequency can not be too high.Soft switching DC/DC converter switch tube, in the open or off course, or to which the voltage is zero, zero voltage switching (Zero-Voltage-Switching, ZVS), or through the switch of the current is zero, zero current switching (Zero-Current · Switching, ZCS).This soft switch method can significantly reduce switching loss, as well as the switch process from the switch frequency oscillation, can greatly improve the converter, for the miniaturization and modularization created a condition.Power field effect transistor (MOSFET) is the most commonly used switch device, it has a higher switching speed, but also has higher parasitic capacitance.It off, in the effects of voltage, the parasitic capacitance of full power, if in its opened not the partial charge is discharged, will be consumed in the device inside, this is the capacitive turn-on loss.In order to reduce or eliminate the loss, power field effect tube adopting zero voltage switching mode (ZVS).Insulated gate bipolar transistor (Insu1ated Gate Bipo1ar Tansistor, IGBT) is a kind of composite switch device, turn-off current trail will lead to bigger turn-off loss, if in the turn-off to the current through it drops to zero, it can significantly reduce switch loss, because this IGBT should be zero current (ZCS) off mode.IGBT in zero voltage conditions Shimonoseki fault, also can reduce the turn-off loss, but MOSFET at zero current conditions of opening, and can reduce capacitive turn-on loss.Resonant converter (ResonantConverter, RC), quasi resonant converter (Qunsi-Tesonant Converter, QRC), multiple resonant converter (Mu1ti-ResonantConverter, MRC), zero voltage switching PWM converter (ZVS PWM Converter), zero current switching PWM converter (ZCS PWM Converter), zero voltage switching (Zero-Vo1tage-Transition, ZVT) PWM converter with zero current switching (Zero- Vo1tage-Transition, ZVT) PWM converter, soft switching DC DC converter belongs to.Power electronic devices and zero switching converter technology development, the high frequency switching power supply development.
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