Push Wave Power Supply Circuit for Voltage Droop Suppression
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Solution Overview
Problem
Existing power supply devices for push wave generation in ultrasound diagnostic apparatuses face a droop phenomenon due to the decrease in charging voltage during push wave transmission, leading to a reduction in the magnitude of the push wave.
Innovation Solution
A power supply device comprising a capacitor that accumulates power from a power supply, a constant voltage circuit between the capacitor and the pulse generation circuit, and a current cutoff/adjuster that ensures the pulse generation circuit outputs a transmission signal with a sufficient magnitude to the ultrasound oscillator, thereby maintaining the energy of the push wave.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a capacitor is charged from a variable voltage power supply via a constant current source to generate push waves, then the push wave can be transmitted to the biological tissue, but the charging voltage gradually decreases during the transmission period causing a droop phenomenon that reduces the magnitude of the push wave
Solution Approach 1:
The patent applies preliminary action by pre-charging the capacitor to a voltage higher than the constant voltage output before push wave transmission begins. This ensures that when the transmission signal is generated, the capacitor has sufficient stored energy to maintain push wave magnitude throughout the entire transmission period, preventing the droop phenomenon.
Solution Approach 2:
The patent changes the voltage parameter of the capacitor from the standard constant voltage output to a higher pre-charged voltage. This parameter change allows the capacitor to provide sufficient energy for the entire push wave transmission duration, maintaining stable push wave magnitude despite the natural discharge characteristic of capacitors.
2Productivity
If the transmission signal is generated by the energy of the electric charge accumulated in the capacitor, then the push wave can be transmitted, but the electric charge decreases during transmission causing a gradual decrease in charging voltage
Solution Approach 1:
The system performs preliminary charging of the capacitor to a voltage higher than the constant voltage circuit output before transmission begins. This preliminary action ensures that the capacitor accumulates sufficient electric charge to maintain consistent charging voltage throughout the push wave transmission period, ensuring reliable and consistent transmission capability.
3Stability of the object's composition
If a constant voltage circuit is provided between the capacitor and the pulse generation circuit, then the voltage can be stabilized, but the push wave magnitude may still be insufficient without pre-charging the capacitor to a higher voltage
Solution Approach 1:
The patent changes the voltage parameter by pre-charging the capacitor to a value higher than the constant voltage circuit output. This parameter change allows the system to maintain voltage stability through the constant voltage circuit while simultaneously ensuring sufficient push wave energy magnitude by starting with a higher initial charge.
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 proposed solution effectively transmits a push wave with sufficient magnitude to the biological tissue for elasticity measurement, mitigating the droop phenomenon and maintaining energy levels, thus enhancing the accuracy of elasticity measurements.
Implementation Method 1
a capacitor that accumulates the power supplied from the power supply
Implementation Method 2
a constant voltage circuit that is provided between the capacitor and the pulse generation circuit
Data Source
AI summary
A power supply device for push wave generation includes a positive electrode power supply and a negative electrode power supply as power supplies that output power supplied to a pulser circuit to which an ultrasound oscillator is connected. A positive electrode capacitor and a negative electrode capacitor accumulate the power supplied from the positive electrode power supply and the negative electrode power supply. A variable constant voltage circuit is provided between the positive electrode capacitor and the pulser circuit, and a variable constant voltage circuit is provided between the negative electrode capacitor and the pulser circuit. The pulser circuit outputs a positive/negative pulse voltage to the ultrasound oscillator as a push wave transmission signal, and the ultrasound oscillator transmits a push wave in response to the push wave transmission signal.