PWM Power Supply Modulator With Two-Supply Transistor Bias Control
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Solution Overview
Problem
Existing power supply modulators require five external power supplies to operate, which is inefficient and can be reduced by using a power supply modulator with a first and second switching element, driver circuits, and specific voltage connections to control transistor states based on pulse width modulation signals.
Innovation Solution
The power supply modulator includes a first switching element, a second switching element, a first driver circuit, and a second driver circuit, where the first and second switching elements are transistors, and the driver circuits control the switching elements' states using resistance changes in response to pulse width modulation signals, reducing the need for multiple power supplies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If five power supplies are used to provide first, second, third, fourth and fifth voltages to the power supply modulator, then each transistor can be properly biased and controlled, but the number of power supplies increases and the system complexity increases
Solution Approach 1:
The patent combines multiple power supply functions into fewer power supplies. Specifically, the first and second voltages are generated from a first power supply, while the third and fourth voltages are generated from a second power supply. This merging reduces the total number of power supplies from five to two while maintaining proper transistor bias control through intelligent voltage generation and distribution circuits.
Solution Approach 2:
Each power supply is designed to provide multiple voltage levels to different parts of the circuit. The first power supply provides both the first voltage (to the drain of the first transistor) and the second voltage (to the drain of the second transistor), while the second power supply provides both the third voltage (to the drain of the third transistor) and the fourth voltage (to the drain of the fourth transistor). This multi-functionality reduces the overall number of power supplies needed.
2Ease of operation
If five power supplies are used to drive the power supply modulator, then all transistors can operate with proper voltage levels, but the external power supply circuit becomes more complex and less efficient
Solution Approach 1:
The patent merges the power supply configuration into a more manageable structure by using only two power supplies instead of five. The voltage generation circuits intelligently distribute the required voltage levels from these two power supplies to all transistor drains, simplifying the external power supply circuit while maintaining ease of operation for bias control.
3Measurement precision
If separate power supplies are used for each voltage (first through fifth voltages), then precise voltage control is achieved, but the number of power supplies increases to five
Solution Approach 1:
The patent combines five separate voltage supply functions into two power supplies. The voltage generation circuits use resistive dividers and control transistors to precisely generate the required voltage levels (first through fifth voltages) from just two power supply sources, maintaining voltage control precision while reducing the quantity of power supplies from five to two.
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 configuration reduces the number of power supplies required to less than five, enhancing efficiency and simplifying the power supply circuit.
Implementation Method 1
control opening and closing of the first switching element by means of a change in a value of resistance between the fifth terminal and the sixth terminal, the change depending on a signal level of a pulse width modulation signal
Data Source
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AI summary
A power supply modulator (1) includes: a first switching element (11) having a first terminal and a second terminal, a first voltage being applied to the first terminal and the second terminal being connected to an output terminal; and a second switching element (13) having a third terminal and a fourth terminal, the third terminal being connected to each of the following terminals; the output terminal and the second terminal, and a second voltage lower than the first voltage being applied to the fourth terminal. The power supply modulator (1) also includes: a first driver circuit (15) having a fifth terminal and a sixth terminal, the first voltage being applied to the fifth terminal and the sixth terminal being grounded, to control opening and closing of the first switching element (11) by means of a change in a value of resistance between the fifth terminal and the sixth terminal, the change depending on a signal level of a pulse width modulation signal; and a second driver circuit (17) having a seventh terminal and an eighth terminal, the seventh terminal being grounded and the second voltage being applied to the eighth terminal, to control opening and closing of the second switching element (13) by means of a change in a value of resistance between the seventh terminal and the eighth terminal, the change depending on a signal level of an inverted signal of the pulse width modulation signal.