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Constant current source system for average current mode control, and control method thereof

A technology of average current mode and control method, which is applied to the constant current source system controlled by the average current mode, the control of the above constant current source system, and the field of constant current source system, which can solve the problem of increasing the difficulty of system design and subharmonic oscillation of inductor current And other issues

Active Publication Date: 2014-10-22
佛山市南海赛威科技技术有限公司
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Problems solved by technology

But when the duty cycle of the system is greater than 50%, the inductor current will generate sub-harmonic oscillation
In order to avoid sub-harmonic oscillation, the system needs to integrate slope compensation technology, which increases the difficulty of system design

Method used

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  • Constant current source system for average current mode control, and control method thereof
  • Constant current source system for average current mode control, and control method thereof
  • Constant current source system for average current mode control, and control method thereof

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Embodiment 1

[0078] see image 3 , the present invention discloses a constant current source system controlled by an average current mode. The constant current source system includes an inductor L1 and a sampling resistor RCS connected in series with an external load, and a freewheeling circuit connected in parallel with the load, the inductor L1, and the sampling resistor RCS Diode D1, and a power switch to control the charging and discharging state of the inductor.

[0079] The constant current source system also includes an error amplifier, a loop compensation unit, a first voltage-to-current converter, an oscillator, a PWM modulation unit, a latch trigger unit (ie, an RS flip-flop), a drive unit, and a forward The first resistor R1 whose input terminal is connected to the reference source, and the second resistor R2 which is connected to the reverse input terminal of the error amplifier and one terminal of the sampling resistor.

[0080] The PWM modulation unit includes a second volta...

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Abstract

The invention discloses a constant current source system for average current mode control, and a control method thereof. The constant current source system comprises an inductor L1 and a sampling resistor RCS which are connected in series with an external connection load, a freewheeling diode D1 which is connected in parallel with the load, the inductor L1 and the sampling resistor RCS, and a power switch which is used for controlling charging and discharging states of the inductor. The constant current source system further comprises an error amplifier, a loop compensation unit, a first voltage current converter, an oscillator, a PWM modulation unit, a latch trigger unit, a driving unit, a first resistor R1 which is connected with the positive input end of the error amplifier and a reference source, and a second resistor R2 which is connected with the negative input end of the error amplifier and one end of the sampling circuit. According to the constant current source system for the average current mode control, and the control method thereof, brought forward by the invention, the output current precision of a constant current source system can be improved, at the same time, the work frequency is fixed, and the design of the constant current source system can be simplified.

Description

technical field [0001] The invention belongs to the technical field of constant current control, and relates to a constant current source system, in particular to a constant current source system controlled by an average current mode; at the same time, the invention also relates to a control method of the above constant current source system. Background technique [0002] The step-down constant current source system is used in many occasions due to its simple system structure and low system cost. Taking semiconductor solid-state light source driving as an example, high-brightness white LED (light-emitting diode) semiconductor solid-state light source has the advantages of high luminous efficiency, long life, environmental protection, high reliability, etc., and has been widely used in lighting, backlight and display fields. The luminance of LED is proportional to the current flowing through it. The larger the current flowing through the LED, the stronger the LED luminescence...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 职春星曾强杨展悌叶俊
Owner 佛山市南海赛威科技技术有限公司
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