Vehicle Charging Circuit for Fast Parallel Battery Start-Up
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Solution Overview
Problem
Conventional parallel charging methods for vehicle batteries require a long time for circuit connection changes, leading to potential time-out errors due to exceeding reception standby times of external charging facilities.
Innovation Solution
An electrical circuit design that includes a high-voltage capacitor and a low-voltage capacitor, along with a connection switching circuit, allows for discharging the high-voltage capacitor and charging the first battery before initiating parallel charging of both batteries, thereby reducing the time required for circuit preparation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the high-voltage capacitor and low-voltage capacitor are discharged and batteries are connected in sequence, then voltage adjustment and inrush current suppression are achieved, but the circuit connection time becomes too long causing time-out errors
Solution Approach 1:
The patent applies preliminary action by pre-charging the high-voltage capacitor to the first battery's voltage level before the parallel charging connection is made. This preliminary voltage matching eliminates the need for time-consuming discharge and reconnection operations, while still preventing inrush current through controlled voltage equalization. The low-voltage capacitor is simultaneously charged to the second battery's voltage, enabling immediate safe connection.
Solution Approach 2:
The patent uses the low-voltage capacitor as an intermediary element between the second battery and the parallel charging circuit. By charging this capacitor to match the second battery's voltage first, it creates a voltage-matched intermediate connection point that allows the second battery to be connected without causing inrush current or requiring time-consuming discharge operations.
2Reliability
If the conventional sequential connection method is used, then capacitor voltage is adjusted appropriately, but parallel charging cannot be started within the external charging facility's reception standby time
Solution Approach 1:
The patent performs preliminary charging of both capacitors to their respective battery voltage levels before the parallel charging operation begins. This preliminary action ensures that when the batteries are connected in parallel to the charging facility, no voltage equalization time is needed, allowing charging to start immediately within the external facility's reception standby period.
Solution Approach 2:
The patent maintains continuous useful action by having both capacitors charged in parallel simultaneously during the preliminary phase, rather than sequentially. This parallel charging preparation ensures both voltage adjustments occur concurrently, maximizing productivity and enabling immediate transition to battery parallel charging without idle time.
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
The solution enables rapid initiation of parallel charging, preventing time-out errors and ensuring efficient battery charging without prolonged standby times.
Implementation Method 1
A capacitor (hereinafter referred to as "high-voltage capacitor") is provided between high-potential wiring and low-potential wiring of the inverter circuit
Implementation Method 2
there are cases in which a capacitor (hereinafter, referred to as "low-voltage capacitor") is connected between the neutral point and the low-potential wiring
Implementation Method 3
The inverter circuit drives the three-phase motor by converting direct current electric power supplied from the serial circuit of the batteries to alternating current electric power
Implementation Method 4
Temperature of each battery can be raised by transferring electric power between the two batteries via this wiring
Data Source
AI summary
A vehicle mounted electrical circuit, wherein a parallel charging start processing includes a process of discharging a high-voltage capacitor via an inverter circuit and a three-phase motor in a state in which a connection switching circuit is controlled to stop voltage application from a serial circuit of a first battery and a second battery to the high-voltage capacitor, a process of charging the high-voltage capacitor by applying an output voltage of the first battery to the high-voltage capacitor, and a process of charging the first battery and the second battery in parallel by controlling a connection switching circuit such that a first battery is connected between the high-potential wiring and the low-potential wiring, a second battery between the neutral point and the low-potential wiring is connected, and a charging voltage generated by electric power supplied from an external charging facility is applied between the high-potential wiring and the low-potential wiring.