Current balanced power supply circuit of multiple groups of direct current (DC) loads

Abstract

The invention relates to a current balanced power supply circuit of multiple groups of direct current (DC) loads, which is used for driving multiple groups of primary and secondary DC loads. The circuit comprises a current power supply circuit, a first output rectifying circuit, a second output rectifying circuit, a first primary current equalizing circuit and a second primary current equalizing circuit, wherein the current power supply circuit is used for receiving energy of input voltage for generating drive current or drive voltage; the first output rectifying circuit and the second output rectifying circuit are used for rectifying; the first primary current equalizing circuit and the first output rectifying circuit are respectively connected with two DC loads of a first group in series at the output of the current power supply circuit; the second primary current equalizing circuit and the second output rectifying circuit are respectively connected with two DC loads of a second group in series at the output of the current power supply circuit; and equivalent impedance of the first primary current equalizing circuit and the second primary current equalizing circuit are adjusted respectively corresponding to the equivalent impedance of a first group of primary DC loads, a first group of secondary DC loads, a second group of primary DC loads and a second group of secondary DC loads. The current balanced power supply circuit has the advantages of lower complexity, fewer integral elements, lower manufacturing cost and circuit power loss and high operating efficiency.

Description

Technical field [0001] The invention relates to a power supply circuit, in particular to a current balance power supply circuit of multiple groups of DC loads. Background technique [0002] In recent years, due to the breakthrough of light-emitting diode (Light Emitting Diode, LED) manufacturing technology, the luminous brightness and luminous efficiency of light-emitting diodes have been greatly improved, so that light-emitting diodes have gradually replaced traditional tubes and become new lighting components, which are widely used For example, lighting applications such as household lighting devices, automotive lighting devices, handheld lighting devices, LCD panel backlights, traffic sign indicators, and indicating signs. [0003] The light-emitting diode is a DC load. At present, in the application of multiple light-emitting diodes, because the characteristics of each light-emitting diode are different from each other, the current flowing through each light-emitting diode is d...

AI Technical Summary

Problems solved by technology

[0005] However, the traditional multi-group LED current balance power supply circuit uses linear voltage regulators and current mirrors, resulting in large circuit power loss and low circuit operation efficiency. Relatively more components are used and the circuit is more complicated.

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