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1. (WO2014207169) PWM CONTROL MODULE, IN PARTICULAR FOR CONTROLLING AN ELECTRIC AIR CONDITIONING MOTOR

Pub. No.:    WO/2014/207169    International Application No.:    PCT/EP2014/063628
Publication Date: Thu Jan 01 00:59:59 CET 2015 International Filing Date: Fri Jun 27 01:59:59 CEST 2014
IPC: H02M 1/44
H03K 7/08
H02M 1/12
H02M 1/00
Applicants: VALEO SYSTEMES THERMIQUES
Inventors: BOURDEL, Philippe
Title: PWM CONTROL MODULE, IN PARTICULAR FOR CONTROLLING AN ELECTRIC AIR CONDITIONING MOTOR
Abstract:
The invention relates to a PWM control module, comprising a micro controller (1) comprising a current meter and a meter (2) able to deliver at least one PWM control signal (PWM I, PWM 2) with a variable period and duty cycle. The meter (2) comprises a first register (3) for saving a value of the period of the control signal, a second register (4) for saving a value of the duty cycle of the control signal, and compares, over each operating period, a value tc of the current meter with each of the values saved in the first and second registers (3, 4). The micro controller (1) can: receive frequency change request information for the PWM control signal; process the information by computing new values for the period and the duty cycle of the PWM control signal; and compare a value tc of the current meter with a predefined threshold value tmax, so as to allow a refresh of the first and second registers (3, 4) over a current operating period if said value of the current meter tc is below said threshold value tmax, and otherwise to defer the refresh of the registers until the next operating period.