Analog Insulation Multiplexer Waveform Shaping for Small Transformers
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Solution Overview
Problem
Conventional analog insulation multiplexers face issues with magnetic saturation at high temperatures and insufficient response time when using small transformers, leading to incomplete data collection and inadequate settling in subsequent stages.
Innovation Solution
Incorporating a secondary side output adjusting circuit with a series circuit of resistors and capacitors to shape the voltage waveform on the secondary side of the drive insulation transformer, ensuring the voltage exceeds the threshold voltage for a sufficient period and allowing for quick backswing convergence, thus preventing magnetic saturation and enabling a wide temperature range operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a small or micro transformer is used to downsize the analog insulation multiplexer, then the device size is reduced, but magnetic saturation occurs at high temperatures leading to insufficient voltage output
Solution Approach 1:
The patent applies parameter changes by modifying the drive pulse characteristics (width and duty cycle) based on temperature conditions. When temperature exceeds a predetermined threshold, the control unit increases the pulse width and duty cycle to compensate for magnetic saturation effects in the downsized transformer, ensuring sufficient voltage output for FET switching across a wide temperature range
Solution Approach 2:
The patent implements dynamics by making the drive pulse parameters adjustable and adaptive rather than fixed. The control unit dynamically modifies pulse characteristics in response to temperature changes, allowing the transformer to operate reliably across varying thermal conditions despite its compact size
2Stability of the object's composition
If the drive time is shortened to reduce sag, then voltage stability is improved, but the pulse width becomes narrower causing insufficient response time for subsequent stages
Solution Approach 1:
The patent applies dynamics by making the drive pulse width adjustable based on temperature conditions. At higher temperatures where magnetic saturation causes voltage sag, the control unit increases the pulse width to ensure sufficient energy transfer, while at lower temperatures it uses shorter pulse widths to minimize sag, thus dynamically balancing voltage stability and response time requirements
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 ensures that the analog insulation multiplexer operates effectively across a wide temperature range without magnetic saturation, even with small transformers, by maintaining a sufficient voltage level and response time, thereby enhancing data collection and settling performance.
Implementation Method 1
a primary side of a drive insulation transformer T1 is controlled by another FET switch FET1 (corresponding to first switching element) concerning on and off of current
Implementation Method 2
the analog insulation multiplexer according to claims 1 and 3. The respective dependent claims describe advantageous developments of the analog insulation multiplexer according to the invention
Implementation Method 3
a secondary side output adjusting circuit including a series circuit of a resistor and a capacitor
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Provided is an analog insulation multiplexer not causing magnetic saturation even if a small transformer is used and having a wide use temperature range. The analog insulation multiplexer includes: a first switching element FET1 for generating a drive control signal in accordance with an external signal; a drive insulation transformer T1 for receiving the drive control signal on a primary side via a first resistor R1 and for delivering an insulated drive control signal from a secondary side; a second switching element FET2 for chopping an analog signal input in accordance with the insulated drive control signal; and an analog signal insulation transformer T2 for delivering an insulated chopped analog signal on a secondary side. The analog insulation multiplexer further includes a secondary side output adjusting circuit 10 having a second resistor R2 connected, on the primary side of the drive insulation transformer T1, in parallel to the first resistor R1 and a capacitor C1 having one end connected to a ground and another end connected in series to the second resistor.