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Floating output voltage boost-buck regulator using a buck controller with low input and low output ripple

A technology of input voltage and controller, applied in the direction of control/regulation system, conversion of DC power input to DC power output, output power conversion device, etc., can solve the problems of increasing cost and size

Active Publication Date: 2017-04-19
ANALOG DEVICES INT UNLTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additional switches add cost and size, and transitions between buck and boost modes can create noise
Such buck-boost converters have neither low input voltage ripple nor low output voltage ripple, thus generating higher than desired EMI

Method used

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  • Floating output voltage boost-buck regulator using a buck controller with low input and low output ripple
  • Floating output voltage boost-buck regulator using a buck controller with low input and low output ripple
  • Floating output voltage boost-buck regulator using a buck controller with low input and low output ripple

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Embodiment Construction

[0019] figure 1 An embodiment of a current regulator 10 according to one embodiment of the invention is illustrated. Regulator controller 12 may be a conventional buck controller IC connected in a novel configuration. Controller 12 may have various features not relevant to the present invention but desired by the system designer.

[0020] The power supply PS provides an input voltage Vin with respect to ground. The input capacitor Cin reduces switching noise coupled to the power supply bus. LED string 16 is connected across the floating output terminals of current regulator 10 .

[0021] Controller 12 contains an oscillator capable of developing a switching frequency greater than 100 kHz.

[0022] During steady state operation, switch S1 , which may be a MOSFET or other suitable transistor switch, is closed at the beginning of the switching cycle to couple Vin across inductor L1 . The inductor L1 is then charged with a ramped current. Since the current conducted by indu...

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PUM

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Abstract

A converter generates an output voltage differential across a floating load, such as a string of LEDs. The converter receives an input voltage Vin from a power supply, and the floating output voltage differential may be greater than or less than Vin. The converter uses a first switch and first inductor in a boost mode type configuration, and uses a second switch and second inductor in a buck mode type configuration. The inductors have a common node. The first inductor has another end coupled to ground, and the other end of the second inductor is coupled to the load. Both inductors charge and discharge together depending on the conductivities of the switches. One end of the load will be approximately zero volts, while the other end will be at a negative voltage VEE. The two inductors smooth input current / voltage ripple and output current / voltage ripple, resulting in low EMI.

Description

[0001] Related Application Cross Reference [0002] This application claims priority to U.S. Provisional Application No. 62 / 042,094, filed August 26, 2014, by Keith D. Szolusha, assigned to The present invention is assigned to and incorporated by reference. technical field [0003] The present invention relates to voltage or current regulators, and in particular, to regulator configurations that output a voltage across a floating load, such as a string of light emitting diodes (LEDs), where the voltage across the load can be greater or less than the input voltage, and where the first The inductor smoothes the input current or input voltage ripple and wherein the second inductor smoothes the output current or output voltage ripple to achieve low EMI. Background technique [0004] It is common to use DC / DC switched mode power supply converters to drive series LED strings. One end of the string of LEDs can be connected to a reference source (eg, ground or input voltage), or ...

Claims

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Application Information

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IPC IPC(8): H02M3/00H02M3/158H05B33/08H05B44/00
CPCH02M3/005H02M3/158H02M3/1582H02M3/1588H05B45/375H05B45/38H02M1/0003H05B45/3725Y02B70/10
Inventor 基思·D·索露莎
Owner ANALOG DEVICES INT UNLTD
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