Elevator Driving System Battery Current Suppression

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

The existing elevator driving systems require a slow start circuit to suppress excessive charging current, which increases costs, and there is a need for a system that can reduce charging current without this additional component.

Innovation Solution

A driving system for elevators that includes a motor, power source, battery device, conversion circuit, and controller, which switches between power delivering and charging paths based on the elevator's state, using the conversion circuit to convert battery power into driving power when moving and source power into battery power when at rest, thereby eliminating the need for a slow start circuit and rectifier.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a slow start circuit is added to suppress excessive charging current, then the charging current is reduced, but the device complexity and cost increase

Engineering Contradiction:

Improvecharging current suppressionVSAvoidcircuit configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts and removes the slow start circuit from the system by using the battery device itself to perform the current suppression function. The battery device replaces the external slow start circuit, eliminating the need for additional circuitry while maintaining the ability to suppress excessive charging current.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The battery device is designed to serve multiple functions: it acts as both the power storage device and the current suppression device. By making the battery device multi-functional, the patent eliminates the need for separate slow start circuitry, thereby reducing device complexity while maintaining reliability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Use of energy by moving object

If a rectifier is used to charge the capacitor device, then the charging operation can be performed, but the charging current becomes excessively large which may burn out the rectifier

Engineering Contradiction:

Improvecharging operationVSAvoidexcessive charging current

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The battery device serves as an intermediary between the power source and the capacitor device. It absorbs the excessive charging current that would otherwise damage the rectifier and capacitor device, while still enabling the charging operation to proceed effectively.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the electrical parameters of the system by introducing a battery device with appropriate internal resistance and voltage characteristics. This parameter change allows the system to handle charging current more effectively, preventing rectifier burnout while maintaining charging functionality.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the battery device voltage is maintained at high voltage value, then the charging current is reduced, but the power management becomes more complex

Engineering Contradiction:

Improvecharging current reductionVSAvoidpower management

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The controller implements feedback control to monitor the battery device voltage and adjust the charging process accordingly. By maintaining the battery voltage at an optimal high level through feedback control, the system reduces charging current while the intelligent power management handles the complexity automatically.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The battery device and controller work together in a self-regulating system where the battery's electrical characteristics and the controller's management algorithms jointly optimize the charging process, reducing the need for external complex power management circuitry.

Inventive Principle:

Principle #25Self-service

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 approach reduces charging current and eliminates the need for a slow start circuit and rectifier, leading to cost savings while maintaining high battery voltage during charging.

Implementation Method 1

controls the conversion circuit to convert the battery power into the driving power

Methodology Applied

Scientific EffectElectrical Energy Conversion:

Implementation Method 2

controls the conversion circuit to convert the source power into the battery power

Methodology Applied

Scientific EffectElectrical Energy Conversion:

Implementation Method 3

The battery device stores a battery power

Methodology Applied

Scientific EffectElectrical Energy Storage: Battery (electricity)

Data Source

PatentEP4393859B1Driving system for elevator

Publication Date: 2026.01.14 APH EPOWER CO LTD

Figure 1
Figure 2
Figure 3

AI summary

A driving system (100, 200, 300, 400) for an elevator includes a motor (MTR), a power source (PS), a battery device (110, 310), a conversion circuit (120, 320), a power path circuit (130, 330, 430) and a controller (140, 340). When the elevator is moving, the controller (140, 340) controls the power path circuit (130, 330, 430) to generate a power delivering path (L1, L4) between the conversion circuit (120, 320) and the motor (MTR), and controls the conversion circuit (120, 320) to convert a battery power (PB) into a driving power (PDR). When the elevator is at rest, the controller (140, 340) controls the power path circuit (130, 330, 430) to generate a charging path (L2, L3) between the conversion circuit (120, 320) and the power source (PS), and controls the conversion circuit (120, 320) to convert a source power (PPR) into the battery power (PB).