Electromagnetic Valve Driver Noise-Resistant Power Supply
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Solution Overview
Problem
The existing electromagnetic valve drivers face challenges in accurately detecting drive current due to switching noise generated by power switching elements, which disrupts current detection accuracy.
Innovation Solution
The electromagnetic valve driver incorporates a power feeder that applies a power voltage to the electromagnetic coil based on detection values, using a booster circuit to generate and sample a reference power during periods excluding the switching period, thereby reducing the influence of switching noise and improving detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a booster circuit is used to boost battery voltage for electromagnetic coil driving, then the drive capability of the electromagnetic valve is improved, but switching noise is generated that disrupts current detection accuracy
Solution Approach 1:
The patent divides the power supply system into two independent paths: one path (booster circuit) for high-power electromagnetic coil driving, and another path (power supply circuit) for low-power detector operation. This segmentation allows each subsystem to operate independently without mutual interference, solving the contradiction between drive capability and detection accuracy.
Solution Approach 2:
The patent extracts the power supply for the detector from the noisy booster circuit output. By taking out a separate reference power source and supplying it exclusively to the detector, the system eliminates the harmful switching noise from the detection path while preserving the high-power capability of the booster circuit for coil driving.
2Ease of operation
If power switching elements are used to switch battery voltage, then the electromagnetic valve can be controlled precisely, but switching noise propagates to the power supply of the current detector
Solution Approach 1:
The patent introduces an intermediary reference power source that mediates between the noisy switching power output and the sensitive detector. This intermediary provides a clean, stable power supply to the detector, isolating it from switching noise while allowing the switching elements to continue providing precise control for the electromagnetic coil.
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 solution enhances the accuracy of drive current detection by isolating switching noise, allowing for precise control and operation of the electromagnetic valve.
Implementation Method 1
a booster circuit configured to boost the battery voltage by switching the battery voltage to generate the power voltage
Implementation Method 2
a current detection resistor connected in series to the electromagnetic coil, a constant current control circuit configured to control a drive current of the electromagnetic coil on the basis of a terminal voltage of the current detection resistor
Implementation Method 3
the power supply supplies the power obtained by sampling and holding a reference power in a period excluding a switching period of the battery voltage in the electric power feeder to the detector
Data Source
AI summary
An electromagnetic valve driver includes: an electric power feeder configured to apply a power voltage obtained by switching a battery voltage to one end of an electromagnetic coil of an electromagnetic valve; a detector configured to detect a drive current flowing through the electromagnetic coil; and a power supply configured to supply power to the detector. The electric power feeder adjusts the drive current by operating in a state in which the power voltage is applied to the electromagnetic coil on the basis of a detection value of the detector. The power supply supplies the power obtained by sampling and holding a reference power in a period excluding a switching period of the battery voltage in the electric power feeder to the detector.