Method for recharging a traction battery using a voltage source lower than that of the traction battery and corresponding vehicle
The method uses the traction inverter and electric motor to create a voltage booster with a specific switching scheme, addressing the cost and damage issues of lower voltage charging stations by minimizing current ripples and iron losses, ensuring efficient and safe battery charging.
FR3151806B1Active Publication Date: 2025-12-05RENAULT SA
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Patent Information
- Application Number
- FR2023008373
- Authority / Receiving Office
- FR · FR
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2023-08-02
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2043-08-02
Smart Images
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Abstract
Method for recharging a traction battery by a voltage source lower than that of the traction battery and corresponding vehicle The present invention relates to a method for recharging a traction battery (28) of an electric or hybrid vehicle, the battery being connected to a smoothing capacitor (26) and to a traction inverter (24) connected to the stator windings (L1, L2, L3) of an electric motor (20) whose neutral point (N) is connected to a voltage source (40) delivering a voltage (VDC) lower than that of the battery (28), the inverter (24) having three switching arms each comprising a low switch (1_L, 2_L, 3_L), the recharging of the battery (28) being effected by applying a switching duty cycle (α) to the switches (1_L, 2_L, 3_L, 1_H, 2_H, 3_H),The charging process is characterized in that a first (1_L) and a second (2_L) of the lower switches close in phase while a third (3_L) of the lower switches opens and closes in opposite phase. (Figure 1)
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