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Primary side-controlled constant current switch power supply controller and primary side-controlled constant current switch power supply control method

A technology of power supply controller and constant current switch, applied in electric light source, control/regulating system, light source, etc., can solve the problems of difficult electromagnetic compatibility standard and large fluctuation range of circuit frequency, achieve high power factor and achieve constant output. Streaming, simple-structured effects

Active Publication Date: 2012-02-29
HANGZHOU SILAN MICROELECTRONICS
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AI Technical Summary

Problems solved by technology

However, these chips all work in the frequency conversion mode (current critical discontinuous mode), so the circuit frequency fluctuation range is relatively large, and it is difficult to pass the electromagnetic compatibility standard

Method used

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  • Primary side-controlled constant current switch power supply controller and primary side-controlled constant current switch power supply control method
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  • Primary side-controlled constant current switch power supply controller and primary side-controlled constant current switch power supply control method

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Embodiment Construction

[0061] The content of the present invention will be described in detail below in conjunction with the block diagram of the present invention and the schematic diagrams of specific embodiments.

[0062] refer to Figure 4 , the constant current switching power supply controller controlled by the primary side includes a current sampling terminal (CS), a ground terminal (GND), a power supply terminal (VDD), a driving terminal (DRV), a voltage feedback terminal (FB) and a frequency setting terminal (FSET ),as well as:

[0063] The first sampling and holding module 100, the input terminal of the first sampling and holding module 100 is connected to the current sampling terminal (CS), and its output terminal is connected to an input terminal of the average current loop 200, and the first sampling and holding module 100 is used Sampling and holding the signal from the current sampling terminal (CS) in each switching cycle of the power switch of the main circuit of the switching powe...

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Abstract

The invention provides a primary side-controlled constant current switch power supply controller and a primary side-controlled constant current switch power supply control method. The controller comprises a current sampling end, a grounded end, a power supply end, a driving end, a voltage feedback end, a frequency setting end, a first sampling hold module, an average current ring module, a saw-tooth wave generation module, a comparison module, a second sampling hold module, a voltage / frequency conversion module, a driving pulse generation module and a driving module. The controller has a simple structure and can be used for realizing a high-power factor within a full-input voltage range while constant current is output; in addition, when output voltage is unchanged, work frequency of the circuit is basically constant, so that the work frequency meets the electromagnetic compatible standard more easily. The primary side-controlled constant current switch power supply controller and theprimary side-controlled constant current switch power supply control method can also be used for a direct-current input low-power power supply without requirement on a power factor so as to realize constant current output.

Description

technical field [0001] The invention belongs to the technical field of switching power supplies, and relates to a primary side controlled constant current switching power supply controller and a method. Background technique [0002] At present, many isolated power supplies such as mobile phone chargers and high-power LED drivers usually require the circuit to have the function of outputting constant current due to application requirements; IEC1000-3-2, etc., the above isolated power supply must also have power factor correction (PFC) function, figure 1 It is a commonly used single-stage power factor correction scheme at present: by detecting the output current on the secondary side of the transformer, it is sent to the PFC control circuit on the primary side after being fed back by an optocoupler. figure 1 In the prior art solution shown, due to the existence of the secondary side current sampling circuit and the optocoupler, the complexity of the circuit is increased. Furt...

Claims

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Application Information

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IPC IPC(8): H02M1/08H02M3/335H02M3/155H05B37/02
Inventor 谢小高吴建兴
Owner HANGZHOU SILAN MICROELECTRONICS
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