Motor Driver Brake Mode Power Consumption Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional motor drivers consume electric current when in a brake state, particularly in applications like in-vehicle systems where motors are frequently halted, leading to increased power consumption.
Innovation Solution
A motor driver configuration that includes a half-bridge power output section with high-side and low-side transistors, a high-side driving circuit, and a control portion that turns off the high-side driving circuit and optionally the low-side driving circuit when switching to brake mode, reducing power consumption by minimizing active states during braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor driver is in an active state during brake mode, then the motor can be reliably stopped, but power consumption increases
Solution Approach 1:
The patent segments the control of high-side and low-side transistors into independent driving circuits. The high-side driving circuit can be turned off while the low-side driving circuit remains active during brake mode, allowing selective power reduction while maintaining braking function. This segmentation enables different power consumption states for different transistor groups, resolving the contradiction between reliability and energy use.
Solution Approach 2:
The patent implements dynamic control of the driving circuits' operational states. The high-side driving circuit transitions from active to inactive state during brake mode, while the low-side driving circuit remains active. This dynamic state change allows the system to adapt power consumption to the actual braking requirements, maintaining reliability when needed while reducing energy consumption during prolonged halt states.
2Use of energy by moving object
If the high-side driving circuit is turned off during brake mode, then power consumption is reduced, but control capability may be limited
Solution Approach 1:
By segmenting the driving circuits into high-side and low-side independent controls, the patent maintains control capability through the active low-side driving circuit even when the high-side driving circuit is off. The low-side circuit can still control the low-side transistor to maintain braking function, while the segmented architecture preserves the option to reactivate the high-side circuit if additional control is needed, thus maintaining adaptability while reducing power consumption.
3Use of energy by moving object
If the low-side driving circuit is turned off during brake mode, then power consumption is further reduced, but the ability to respond to external brake signals may be impaired
Solution Approach 1:
The patent configures the low-side driving circuit to be pre-configured for rapid response to external brake signals. The circuit remains in an active state specifically prepared to receive and respond to brake signals from external terminals, ensuring ease of operation when braking is required. This preliminary preparation allows the system to maintain operational readiness for external signals while still reducing overall power consumption compared to having both driving circuits fully active.
Data Source
AI summary
The present invention provides a motor driver and a motor driving system capable of suppressing power consumption when a motor is in a brake state. The motor driver of the present invention includes: a half-bridge power output section, including a high-side transistor and a low-side transistor; a high-side driving circuit, driving the high-side transistor; and a control portion. When switching to a brake mode, the low-side transistor is turned on and the control portion turns off the high-side driving circuit.