Semiconductor Switches Replace Relays in Battery Charge Discharge Circuits
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Solution Overview
Problem
The existing charge and discharge circuits in battery systems suffer from low switching speed and high failure rates due to the use of relays, which adversely affect the charging and discharging capability of battery modules and packs.
Innovation Solution
A charge and discharge circuit utilizing semiconductor switches, such as MOSFETs or IGBTs, connected in series with a battery pack and charging or electrical devices, allowing for improved switching speed and reduced failure rates, with a controller managing the switching to enhance control and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a relay is used to control charging and discharging, then the circuit can be controlled, but the switching speed is low and the failure rate is high
Solution Approach 1:
The patent replaces the mechanical relay system with a semiconductor switch system (MOSFETs or IGBTs). This substitution eliminates the mechanical moving parts of relays, thereby increasing switching speed and reducing failure rates associated with mechanical wear and contact arcing. The semiconductor switches are controlled by gate signals to achieve reliable and rapid switching of the battery pack charging and discharging circuits.
2Ease of operation
If a relay is used in the charge and discharge circuit, then the circuit can be controlled, but the controllability and switching speed are reduced
Solution Approach 1:
The patent replaces the mechanical relay system with a semiconductor switch system (MOSFETs or IGBTs). This substitution eliminates the mechanical moving parts of relays, thereby increasing switching speed and reducing failure rates associated with mechanical wear and contact arcing. The semiconductor switches are controlled by gate signals to achieve reliable and rapid switching of the battery pack charging and discharging circuits.
3Reliability
If relays are used for switching, then the circuit can function, but the volume and weight of the circuit increase
Solution Approach 1:
The patent replaces the mechanical relay system with a semiconductor switch system (MOSFETs or IGBTs). This substitution eliminates the mechanical moving parts of relays, thereby increasing switching speed and reducing failure rates associated with mechanical wear and contact arcing. The semiconductor switches are controlled by gate signals to achieve reliable and rapid switching of the battery pack charging and discharging circuits.
4Productivity
If relays are used for switching, then the circuit can function, but the switching speed and charging-discharging capability are reduced
Solution Approach 1:
The patent replaces the mechanical relay system with a semiconductor switch system (MOSFETs or IGBTs). This substitution eliminates the mechanical moving parts of relays, thereby increasing switching speed and reducing failure rates associated with mechanical wear and contact arcing. The semiconductor switches are controlled by gate signals to achieve reliable and rapid switching of the battery pack charging and discharging circuits.
Data Source
AI summary
The present application provides a charge and discharge circuit, and relates to the field of battery power. The charge and discharge circuit comprises: a charge circuit comprising a battery pack, a first switch set and a charging device connected in series; and a discharge circuit comprising the battery pack, a second switch set and an electrical device connected in series; both the first switch set and the second switch set comprise at least one switch, and the at least one switch in the first and/or second switch set is a semiconductor switch.