Multi-path direct current power supply circuit

Abstract

The invention discloses a multi-path direct current power supply circuit, which comprises a master transformer and a first rectification filtering unit. The master transformer comprises a primary winding and a secondary winding. The primary winding of the master transformer and a first switch are connected in series with input voltage. The secondary winding of the master transformer, the first rectification filtering unit and a current sharing capacitor form a power supply loop. In the first rectification filtering unit, a first input end is connected with the second input end of the first rectification filtering unit sequentially by a first diode, a second capacitor and a fourth diode, and a second input end is connected with the first input end of the first rectification filtering unit sequentially by a third diode, a first inductor, a first capacitor and a second diode. The multi-path direct current power supply circuit can be applied to low-cost occasions in which the primary sides of the master transformers are provided with only one switching tube respectively.

Description

technical field [0001] The invention relates to direct current power supply technology, in particular to a multi-channel direct current power supply circuit. Background technique [0002] At present, for LED constant current control driven by multiple light-emitting diodes (LEDs), the most commonly used solution is a constant voltage module + multiple non-isolated DC / DC constant current modules. [0003] Such as figure 1 Shown is an LED constant current control circuit driven by multiple LEDs in the prior art. In this circuit, the input voltage Vac is used as the input of multiple non-isolated DC / DC constant current modules after passing through the constant voltage module, and each non-isolated DC / DC constant current module performs constant current control independently. However, since the voltage of the constant voltage module and the voltage of the LED generally have a large voltage difference, the efficiency of the multi-channel non-isolated DC / DC constant current mod...

AI Technical Summary

Problems solved by technology

Since the primary side of the main transformer in this drive circuit uses dual switch tubes, a complex drive circuit is required, so the implementation cost is relatively high; moreover, the above-mentioned drive circuit is not suitable for the primary side of the main transformer such as a flyback conversion circuit with only one In the case of switching tubes

Images