Power switch on power efficiency - Power Circuit - Circuit Diagram

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High-frequency switching power supply operation (electronic) allows the use of small passive components, hard switching mode will lead to increased switching losses, to reduce high-frequency switching loss, industry development soft switching technology, load resonance technology and zero voltage conversion technology are widely used . Here are the load resonance techniques using capacitors and inductors for the resonant characteristics of the entire antenna during switching, the switching frequency as a change in input voltage and current.

Variations in switching frequency, such as pulse frequency modulation (baked) with electronic filtering design, introduce many difficult inputs. Because there is no filter inductor, the output voltage is included on both ends of the attack and defense. Designers choose low rectifier diodes for rated voltage diodes. However, when the load current increases and the burden of loss of inductance and capacitance is lacking, the load resonance technique is not suitable for high output current and low voltage. On the other hand, the voltage conversion technique uses a parasitic composition that is only one step away from the resonant characteristics of the antenna that switches the circuit switched on and off. One of the benefits is the use of these parasitic components, such as the main transformer leakage inductance and capacitance, the increase in output of more external components without switching to achieve soft open. In addition, the application of technology has a fixed switching frequency pulse width modulation technology, these techniques are therefore easier to understand based on load resonance technology, analysis and design.

Crazy is due to the characteristics of PWM half-bridge inverter symmetry and simple configuration and zero voltage switching (zero voltage), using zero voltage conversion technology is one of the most common topologies. Not only that, but with the load resonant converter, LLC topology asymmetric half-bridge inverter has a type of inductor, and its output current output pulsing small components can pass the appropriate output capacitance. Due to analysis and design, and output power inductors, asymmetric half-bridge inverters are typically used for PWM high output current and low voltage applications such as computer and server power. In order to better handle the output current, often using a synchronous rectifier in the secondary, the loss of resistance can be lost due to transmission losses. Compared to the LLC converter, it is more convenient to drive the asymmetric half-bridge inverter synchronous rectifier. In addition, the current main transformer has a common solution for increasing the utilization of the meter head with high power flow. An example of this crazy current amplifier and synchronous rectifier asymmetric half-bridge inverter and common features, some experimental results, samples for asymmetric topology power switch control. The crazy current amplifier and synchronous rectifier asymmetric half-bridge inverter advantages, from low to high voltage and current output current, the application is widely used to multiply. Figure 1 shows a current in a secondary multiplier symmetrical half-bridge inverter PWM secondary coil that is a single structure and the output inductor can be divided into two smaller inductors. In order to improve the overall efficiency, a relational database (in) device is used to form a synchronous rectifier and a synchronous rectifier (SR). Compared with the traditional central shunt (center), there are many advantages to configuring the eavesdropping current multiplier: first, the DC excitation current component is less than or equal to the central shunt DC component, and is configured to use a small core transformer. When the inductor current of each output is loaded, half of the center-excavated field current patterns are similar.

If the inductor current of the output data is loaded with bear imbalance, the field current will also decrease. Second, the square root of the coil current (root-to-flower, rms) - for this type of configuration, almost half of the load current in the center flows through each output inductor. In view of this, in this paper, the secondary coil current density is low, you can use the same magnetic field and the same wire specification to look at it. Third, the body is a simple solution center that is particularly noteworthy because of the limitations of the transformer line password that can be used in the output of many applications. Fourth, we can more easily and effectively output the grid of the signal to the ratio of the SR inductor coil, due to the ratio of the first and second coil transformers, but only a small enough output for the appropriate inductance, such as the grid voltage is easily 20V 10 Between the voltages of volts. In addition, independent production will reduce the cost of the inductor magnetic load. In view of the above advantages, the current multiplier high output current is one of the most commonly used topologies.

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