Processing

Please wait...

Settings

Settings

Goto Application

1. WO2002023736 - CURRENT SENSE IC

Publication Number WO/2002/023736
Publication Date 21.03.2002
International Application No. PCT/US2001/029186
International Filing Date 18.09.2001
Chapter 2 Demand Filed 10.04.2002
IPC
G01R 19/25 2006.01
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
19Arrangements for measuring currents or voltages or for indicating presence or sign thereof
25using digital measurement techniques
H02P 7/00 2006.01
HELECTRICITY
02GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
7Arrangements for regulating or controlling the speed or torque of electric DC motors
H03K 7/08 2006.01
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
KPULSE TECHNIQUE
7Modulating pulses with a continuously-variable modulating signal
08Duration or width modulation
H03M 5/08 2006.01
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
MCODING, DECODING OR CODE CONVERSION, IN GENERAL
5Conversion of the form of the representation of individual digits
02Conversion to or from representation by pulses
04the pulses having two levels
06Code representation, e.g. transition, for a given bit cell depending only on the information in that bit cell
08Code representation by pulse width
CPC
G05B 11/28
GPHYSICS
05CONTROLLING; REGULATING
BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
11Automatic controllers
01electric
26in which the output signal is a pulse-train
28using pulse-height modulation; using pulse-width modulation
H03M 5/08
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
MCODING; DECODING; CODE CONVERSION IN GENERAL
5Conversion of the form of the representation of individual digits
02Conversion to or from representation by pulses
04the pulses having two levels
06Code representation, e.g. transition, for a given bit cell depending only on the information in that bit cell
08Code representation by pulse width
Applicants
  • INTERNATIONAL RECTIFIER CORPORATION [US]/[US]
Inventors
  • TAKAHASHI, Toshio
  • VUKICEVIC, Marijana
Agents
  • SCHEER, Michael, J.
Priority Data
60/233,42418.09.2000US
60/264,29229.01.2001US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) CURRENT SENSE IC
(FR) CIRCUIT INTEGRE DE DETECTION DE COURANT
Abstract
(EN)
A circuit (12) for recovering a current sense signal which is offset by a common mode displacement, such is the case when the signal is the voltage across a current sense resistor located on the high side bus or between the switches of a motor controller circuit. The circuit of the present invention converts the voltage across the resistor into a pulse code modulated (PWM) (OUTPUT) data, then downshifts the voltage, such that the signal of interest may be processed and recovered at the lower voltage for current feedback control purposes. The conversion of the measured current into a PWM signal is performed such that the PWM signal is synchronous with the motor PWM frequency. Although the output (MOTOR PHASE) of the IC is synchronous with the motor PWM frequency, the output duty cycle is completely independent of the motor PWM duty cycle. In this way, the reconstructed sampled output of the IC is exactly equal to the fundamental motor current, without the effect of ripple current.
(FR)
Cette invention se rapporte à un circuit (12) servant à rétablir un signal de détection de courant qui est décalé par un déplacement de mode commun, comme c'est le cas lorsque le signal est constitué par la tension traversant une résistance de détection de courant située sur le bus côté haut ou entre les commutateurs d'un circuit contrôleur de moteur. Le circuit faisant l'objet de cette invention convertit la tension traversant ladite résistance en une donnée modulée en code d'impulsion (PWM) (sortie), puis il abaisse la tension, pour que le signal à rétablir puisse être traité et rétabli à la tension plus basse à des fins de commande de réinjection de courant. La conversion du courant mesuré en un signal PWM est effectuée de telle sorte que ce signal PWM soit synchrone avec la fréquence PWM du moteur. Bien que la sortie (phase moteur) du circuit intégré soit synchrone avec la fréquence PWM du moteur, le rapport cyclique de sortie est complètement indépendant du rapport cyclique PWM du moteur. Ainsi, la sortie échantillonnée reconstruite du circuit intégré est exactement égale au courant fondamental du moteur, sans l'effet du courant ondulatoire.
Latest bibliographic data on file with the International Bureau