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Constant current controller and constant current control method

A current controller and constant current modulation technology, applied in the direction of DC power input conversion to DC power output, electrical components, output power conversion devices, etc., can solve the problems of limited application range, inductance deviation, etc., to simplify the system Design, reduce the output current ripple, reduce the effect of conduction loss

Pending Publication Date: 2018-06-29
SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, the inductance of the inductor often has a certain deviation, and the fixed output voltage also greatly limits the application range.

Method used

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  • Constant current controller and constant current control method
  • Constant current controller and constant current control method
  • Constant current controller and constant current control method

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Embodiment Construction

[0041] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0042] In the following description, many specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways than those described here, so the present invention is not limited by the specific embodiments disclosed below.

[0043] Figure 4 It is a schematic diagram of a continuous conduction current mode (CCM) constant current drive control system according to an embodiment of the present invention. refer to Figure 4 As shown, the constant current driving system 400 includes an input rectifier 410 , a step-down (Buck) constant current driving stage 420 and an output load 430 . Input rectifier 410 consists of diodes D1, D2, D3 and D4. The buck constant c...

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Abstract

The invention provides a constant current controller comprising a power supply generator, a reference source, a controlled oscillator, a PWM generator, a PWM driver and a constant current modulator. The reference source generates first reference voltage and second reference voltage, wherein the first reference voltage is higher than the second reference voltage. The controlled oscillator generatesa clock signal according to a PWM delay signal. The PWM generator generates a PWM signal according to the clock signal and a peak detection signal, wherein the peak detection signal triggers the falling edge of the PWM signal. The PWM driver generates a driving signal according to the PWM signal. The constant current modulator generates the peak detection signal according to the comparison resultof the inductively excited current sampling voltage and the first reference voltage and generates the PWM delay signal according to the comparison result of the inductively excited current sampling voltage and the second reference voltage.

Description

technical field [0001] The present invention mainly relates to a switching power supply system, in particular to a switching power supply system for constant current driving, more specifically, a constant current controller and a constant current control method. Background technique [0002] A switching power supply is a voltage conversion circuit, mainly used for step-up and step-down, and is widely used in modern electronic products. For example, a light emitting diode (LED) light source generally uses a switching power supply as its power supply. [0003] Step-down (Buck) constant current drive is the current mainstream LED drive method. This driving method has the advantages of simple structure, low production cost and easy processing. figure 1 An example of a schematic diagram of a traditional step-down Boundary Conduction Mode (Boundary Conduction Mode, BCM) LED constant current drive system. Such as figure 1 As shown, the constant current drive system 100 is compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH02M3/156H05B45/40H05B45/00Y02B20/30
Inventor 朱臻缪海峰李振华刘慧明
Owner SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD