H - Electricity – 02 – M
Patent
H - Electricity
02
M
H02M 3/04 (2006.01) H02M 1/08 (2006.01)
Patent
CA 2743525
Method for closed-loop control of a DC-DC voltage converter operating in zero--voltage switching mode (ZVS) with a switching threshold (Z), the converter comprising: - a plurality of interlaced cells, each cell comprising at least two controlled switches (K1, K2), configured to be alternately closed and open, and an inductor (L) in which an output current (Is) from the cell flows, and - the converter furthermore comprising a clock (6) with a given switching period (Td) configured for triggering the switching of the switches (K1, K2) between upper (+M) and lower (-M) control thresholds, the control threshold (+M, -M) with the value nearest to the switching threshold (Z) being denoted associated control threshold, in which method: - for each cell (A1, A2), an overrun period (T1, T2) is measured, this being the time between the moment when the output current intensity (Is) from the cell is equal to the associated control threshold and the moment when the output current intensity (Is) from the cell is equal to the switching threshold (Z); - a correction time (Tc) is determined corresponding to the minimum overrun period measured for the plurality of cells during an interlacing cycle (CY1, CY2), an interlacing cycle corresponding to the time during which an overrun period (T1, T2) is measured for the plurality of cells (A1, A2); - an optimized switching period (Td') of the clock (6) is calculated by subtracting from the determined switching period (Td) an anticipation time (Ta) which is a function of the correction time (Tc); and - the optimized switching period (Td') is applied to the clock (6) in such a manner as to provide closed-loop control of the interlacing of the currents output from the cells of the converter.
de Sousa Luis
Fontaine Stephane
Sardat Pierre
Robic
Valeo Systemes de Controle Moteur
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