Primary side constant current control device and compensation current signal extraction method
A technology of constant current control and current compensation, applied in control/regulation systems, output power conversion devices, conversion of DC power input to DC power output, etc. stability issues
Active Publication Date: 2020-10-16
HANGZHOU DIANZI UNIV
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Problems solved by technology
However, the optocoupler used to achieve isolated feedback has aging problems, which affects the stability of the circuit and weakens the strength of the electrical isolation of the device
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[0054] The present invention adopts the primary side feedback control technology to realize the output constant current control of the LLC resonant converter, which is applicable to the converter working in the continuous current mode or discontinuous mode, and the current continuous mode or discontinuous mode of the LLC resonant converter Belong to known technology for this technical field. The embodiments of the present invention are applicable to the situation that the current waveform of the LLC resonant converter is symmetrical or approximately symmetrical.
[0055] First, the principle of constant current on the primary side of the LLC resonant converter proposed by the present invention is analyzed.
[0056] When the LLC resonant converter is applied in the current continuous mode with symmetrical current waveform, the primary current waveform is as follows image 3 shown. In continuous mode where the current waveform is symmetrical, the analysis can be performed in h...
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The invention discloses a primary-side constant-current control device and a compensation current signal extraction method. The primary-side constant-current control device comprises an equivalent output current module, wherein the equivalent output current module is used for receiving a signal of reflecting voltages of two end windings of a transformer of a converter and a primary-side resonant current signal of the converter and generating a first resonant zone average current signal V<pri1-avg> and a compensation current signal V<pri2-avg>, and an output current equivalent signal V<Io-est>of reflecting an output current average value is output after the first resonant zone average current signal V<pri1-avg> and the compensation current signal V<pri2-avg> are added. By the primary-sideconstant-current control device, a photocoupler and a secondary-side feedback circuit can be omitted, and the reliability of a circuit is effectively improved; and moreover, the primary-side constant-current control device can be further integrated to form a single chip, and the circuit cost is further reduced.
Description
technical field [0001] The invention belongs to the switching power supply technology in the technical field of power electronics, and relates to a primary side constant current control device suitable for LLC resonant converters or other types of resonant converters. Background technique [0002] In recent years, light-emitting diodes (LEDs) have been widely used in daily life due to their high brightness, long life, and high efficiency, replacing traditional lighting equipment: incandescent lamps, fluorescent lamps, and metal halide lamps. However, LED is a DC type load, and its luminous brightness directly depends on the forward current flowing through the LED. Therefore, in order to ensure the consistency of the luminance of the LED lamp, it is usually driven by a constant current source. [0003] Based on the consideration of the safety of lighting equipment, many LED lamps require that the LED driver must have an isolation device to achieve electrical isolation betwee...
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IPC IPC(8): H02M3/335
CPCH02M3/33569Y02B70/10
Inventor 谢小高董汉菁
Owner HANGZHOU DIANZI UNIV