The miniaturization of LED switching power supply is the research direction of many enterprises recently. LED switching power supply is a new type of switching power supply controlled by PWM technology, that is, pulse-width modulation technology. It is to convert direct current into high frequency ALTERNATING current to transformer voltage, so that it produces a group or more groups of voltage needed, the reason for converting to high frequency alternating current is that the efficiency of high frequency alternating current in the transformer circuit is higher than that of 50Hz or 60Hz. It is of great significance in saving energy, saving resources and protecting the environment.
So how can we miniaturize LED switching power supplies? Here are three specific ways to do it:
First, the use of new capacitors. In order to reduce the volume and weight of power electronic equipment, it is necessary to improve the performance of capacitors and increase the energy density, and to research and develop new capacitors suitable for power electronic and power supply systems, which require large capacitance, small equivalent series resistance (ESR) and small volume.
Second, the application of piezoelectric transformer. The application of piezoelectric transformer to high-frequency power converter can realize light, small, thin and high power density. Piezoelectric transformer USES the characteristic of "voltage - vibration" and "vibration - voltage" transformation of piezoelectric ceramic materials to transmit energy. Its equivalent circuit is like a series and parallel resonant circuit, which is one of the research hotspots in the field of power transformation.
Third, high-frequency. In order to realize the high power density of LED switching power supply, it is necessary to improve the working frequency of PWM converter, thus reducing the volume and weight of energy storage components in the circuit.

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