Battery Control Electronics With Isolated Wake-Up Power Supply
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Solution Overview
Problem
Existing battery systems face high power consumption during idle or sleep modes due to voltage conversion requirements, leading to energy losses and inefficiencies, while also needing to ensure safety and minimal construction space.
Innovation Solution
The control electronics utilize a hybrid power supply system with a first DC/DC converter connected to a high voltage battery system and a second DC/DC converter connected to a low voltage battery, along with a wake-up circuit for galvanic isolation, allowing components to be powered by the low voltage battery during sleep modes, reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage conversion is performed during idle or sleep modes to power control electronics, then the control electronics can operate continuously, but power consumption increases and energy efficiency decreases
Solution Approach 1:
The patent applies preliminary action by pre-charging a capacitor during active modes when power is abundant. This stored energy in the capacitor then sustains control electronics during idle or sleep modes, eliminating the need for continuous voltage conversion and reducing energy losses. The capacitor is charged in advance to ensure continuous operation without real-time power conversion.
Solution Approach 2:
The patent implements periodic action by alternating between active modes (with voltage conversion and capacitor charging) and idle/sleep modes (using stored capacitor energy). This periodic switching allows the system to optimize energy efficiency by performing voltage conversion only when necessary, rather than continuously during all operational states.
2Reliability
If voltage conversion is performed during idle or sleep modes, then control electronics remain powered, but construction space requirements increase
Solution Approach 1:
By pre-charging a capacitor during active modes, the patent eliminates the need for continuous voltage conversion hardware operation. This reduces the effective space utilization of power conversion components and allows for more compact system design, as the capacitor can be smaller than continuous conversion circuitry would require.
3Device complexity
If a single high voltage battery powers all components, then system complexity is reduced, but energy efficiency during sleep modes deteriorates
Solution Approach 1:
The patent segments the power supply system into two distinct sources: a high voltage battery for active modes and a capacitor for idle/sleep modes. This segmentation allows each component to be optimized for its specific function, with the capacitor providing efficient low-power operation during sleep modes without requiring complex voltage conversion, thus reducing energy losses.
Solution Approach 2:
The capacitor is pre-charged during active modes when the high voltage battery is operational. This preliminary energy storage action enables the system to switch to capacitor-powered mode during sleep periods, avoiding the energy inefficiencies of continuous voltage conversion while maintaining simple system architecture.
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
This configuration minimizes power consumption during sleep modes by using the low voltage battery to power critical components, ensuring efficient energy use and maintaining safety without significant space requirements.
Implementation Method 1
a first DC/DC converter (10) with a first input node (11) that is configured to be connected to the battery system (200)
Implementation Method 2
a second DC/DC converter (40) that has an input node (41) which is configured to be connected to the low voltage battery (80)
Implementation Method 3
a wake-up circuit (30) that comprises a low voltage sub circuit (31) and a sub circuit on the high voltage side (32) that are galvanically isolated from each other
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The present invention refers to control electronics (100) for a battery system of a vehicle with a low voltage battery, wherein the control electronics (100) comprise a first DC/DC converter (10) with an first input node (11) that is configured to be connected to the battery system and with an output node (12) that is connected to a microcontroller (20) which is configured for controlling the first DC/DC converter (10); a wake up circuit (30) that comprises a low voltage sub circuit (31) and a sub circuit on the high voltage side (32) that are galvanically isolated from each other; and a second DC/DC converter (40) that has an input node (41) configured to be connected to the low voltage battery and an output node (42) that is connected to the wake up circuit (30), wherein the low voltage sub circuit (31) is configured to transmit electric energy received from the second DC/DC converter (40) to the sub circuit on the high voltage side (32) in response to a received wake-up signal, and wherein the sub circuit on the high voltage side (32) is configured to receive electric energy from the low voltage sub circuit (31) and transmit it to the first DC/DC converter (10). The control electronics (100) allow hybrid supply of its components via the battery system and the low voltage battery, wherein power consumption from the battery system is zero in a sleep mode of microcontroller (20).