EV Charging Control Circuit for Electrolytic Capacitor Life
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Solution Overview
Problem
Electric vehicles' extended operating times accelerate the degradation of electrolytic capacitors due to prolonged voltage application, reducing their service life, while existing control circuits are designed to supply power continuously, which is inefficient and costly.
Innovation Solution
A control circuit with controllable switches and a switch control unit that selectively interrupts power supply to electrolytic capacitors based on the vehicle's operational state, ensuring they are only powered when required, thereby extending their lifespan and reducing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power is supplied continuously to all circuit portions, then all functions are available, but electrolytic capacitor service life is reduced
Solution Approach 1:
The control circuit is divided into multiple independent circuit portions (first circuit portion with electrolytic capacitors, second circuit portion without), each with its own power supply line and controllable switch. This segmentation allows selective powering of only the required circuit portion, preventing continuous operation of electrolytic capacitors when not needed, thus extending their service life while maintaining functional availability.
2Ease of manufacture
If simple continuous power supply is used, then device complexity is low, but electrolytic capacitor degradation is accelerated
Solution Approach 1:
The control circuit transitions from a static continuous power supply to a dynamic selective power supply system. Controllable switches (first switch, second switch) are introduced to dynamically connect or disconnect power supply lines based on operational requirements. This dynamic control extends electrolytic capacitor life by preventing unnecessary operation while maintaining system simplicity through straightforward switch control logic.
3Adaptability or versatility
If all consumers are powered simultaneously, then functional requirements are met, but energy is wasted during charging operations
Solution Approach 1:
Instead of powering all consumers simultaneously (excessive action), the control circuit applies partial action by selectively activating only the necessary circuit portion. During charging operations, only the second circuit portion (without electrolytic capacitors) is powered, while the first circuit portion with electrolytic capacitors remains powered off, reducing energy consumption while still meeting functional requirements.
Data Source
AI summary
A control circuit (10) is configured and intended for use in an electric vehicle (50). The control circuit (10) comprises a first circuit portion (12), a first power supply line (16), a first controllable switch (19), a second circuit portion (20), a second power supply line (26), a second controllable switch (30) and a switch control unit (36). The first circuit portion (12) comprises at least one electrolytic capacitor (14). The first power supply line (16) is configured to supply the first circuit portion (12) with electrical power. The first controllable switch (19) is arranged in the first power supply line (18), wherein the first switch (19) interrupts the first power supply line (16) in an open state in order to prevent the at least one electrolytic capacitor (14) from being supplied with power. The second power supply line (26) is configured to supply the second circuit portion (20) with electrical power. The second controllable switch (30) is arranged in the second power supply line (26), wherein the second switch (30) in an open state interrupts the second power supply line (26). The switch control unit (36) is configured and intended to control the switching states of the first switch (19) and the second switch (30), wherein the first switch (19) and the second switch (30) are closed in a first control state, and wherein in a second control state the first switch (19) is open and the second switch (30) is closed, wherein the switch control unit (36) is further configured and intended to determine the control state on the basis of functional requirements of the electric vehicle (50).