Motor Stator Coil Charging Circuit for Buck-Boost Battery Input
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Solution Overview
Problem
Existing charging systems using stator coils and inverter switching elements as a boost converter are limited in their ability to adjust voltage levels, failing to effectively charge batteries when the power supply voltage is either lower or higher than the battery voltage.
Innovation Solution
A charging system that utilizes stator coils as a reactor, incorporating a controller to manage neutral point switching elements and inverter switching elements to either boost or step down the power supply voltage, allowing charging from power supplies with varying output voltages relative to the battery voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If stator coils and inverter switching elements are used as a boost converter to charge a battery, then the battery can be charged by a power supply with lower output voltage than the battery, but the system cannot step down the power supply voltage when the power supply voltage is higher than the battery voltage
Solution Approach 1:
The stator coils of the motor are designed to serve dual functions: acting as a reactor in a boost converter configuration when the power supply voltage is lower than the battery voltage, and acting as a reactor in a buck converter configuration when the power supply voltage is higher than the battery voltage. This multi-functionality allows the same hardware components to handle both voltage boosting and voltage stepping down operations, thereby achieving universal charging capability across different power supply voltage conditions without requiring separate dedicated circuits for each function.
Solution Approach 2:
The system dynamically switches between boost converter mode and buck converter mode based on the relationship between the power supply voltage and the battery voltage. The controller detects the voltage levels and appropriately configures the switching elements to establish the correct circuit topology, enabling the system to adapt its voltage conversion function in real-time according to the charging conditions.
2Ease of operation
If neutral point charging is used to charge the battery, then the charging circuit is simplified, but the system loses the ability to step down voltage and can only charge from lower voltage power supplies
Solution Approach 1:
The neutral point charging circuit is enhanced by enabling the stator coils to function as reactors in both boost and buck converter configurations. The same neutral point connection structure serves dual purposes: it simplifies the charging circuit when used with lower voltage power supplies while also enabling voltage stepping down capability when connected to higher voltage power supplies, thus maintaining circuit simplicity while gaining voltage adaptability.
Solution Approach 2:
The system changes the operational parameters of the stator coils by altering the switching states of the inverter switching elements and neutral point switching elements. By changing the configuration of these switching elements, the stator coils can operate in different modes (boost or buck converter), allowing the system to adapt to different power supply voltage parameters while maintaining the same physical circuit structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient charging of batteries regardless of the power supply's output voltage, reducing charging losses and enhancing motor drive capabilities by utilizing stator coils as both a boost and buck converter.
Implementation Method 1
a power supply voltage to transfer electric power to the battery or a battery voltage to transfer electric power to the power supply... The voltage of the power supply is boosted by the stator coils... The voltage of the power supply is stepped down by the stator coils
Data Source
Figure 1
Figure 2
AI summary
A charging system (2; 102) includes: a motor (30) including a plurality of stator coils (31); a power receiving terminal (40) including a power receiving positive end (40p) and a power receiving negative end (40n), the power receiving negative end (40n) being connected to a battery negative end (60n), and the power receiving positive end (40p) being connected to a neutral point (34) of the motor (30); a capacitor (41); an inverter (10); a plurality of neutral point switching elements (32) each of which connects a second end of a corresponding one of the stator coils (31) to the neutral point (34); and a plurality of diodes (33; 133a), an anode of each of the diodes (33; 133a) being connected to the power receiving negative end (40n), and a cathode of each of the diodes (33; 133a) being connected to the second end of a corresponding one of the stator coils (31).