Amplifier Power Supply with Controlled Charge Pump Output Range
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Solution Overview
Problem
Existing power supply devices for amplifiers face challenges in reducing power consumption while enlarging the output range, as single power supplies with charge pumps lead to unstable voltage and restricted output ranges, and increased power consumption when trying to enhance the output range.
Innovation Solution
A power supply device with separate generators for positive and negative voltages, a charge pump, and a control unit to adjust voltages such that the negative voltage is a multiple of the positive voltage, allowing for different power levels and reducing capacitor size, thereby minimizing power consumption and increasing output range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If voltage VDD is increased to enlarge the output range of the amplifier, then the output range is improved, but power consumption increases
Solution Approach 1:
The power supply system is segmented into two independent power generators: a first power generator providing positive voltage VDD and a second power generator providing negative voltage VSS. This segmentation allows independent control of each voltage source, enabling the output range to be enlarged without proportionally increasing power consumption, as each generator can be optimized for its specific function.
Solution Approach 2:
The invention changes the voltage parameter relationship from the conventional VSS = -VDD to a more flexible configuration where VSS and VDD can be independently adjusted. The control unit dynamically adjusts the second voltage VSS based on the first voltage VDD and operational requirements, allowing the output range to be optimized without directly increasing power consumption.
2Stability of the object's composition
If capacitance of the capacitors in the charge pump is increased to stabilize voltage VSS, then voltage stability is improved, but capacitor size increases
Solution Approach 1:
The invention extracts the voltage stabilization function from the charge pump capacitors and relocates it to a dedicated control unit. The control unit monitors and adjusts the second voltage VSS to maintain stability, eliminating the need for large capacitance values in the charge pump capacitors and thereby reducing their size.
Solution Approach 2:
The control unit implements a feedback mechanism that monitors the second voltage VSS and adjusts it dynamically to maintain stability. This active feedback control replaces the passive stabilization approach that relied on large capacitor values, achieving voltage stability with smaller capacitors.
3Device complexity
If single power supply with charge pump is used to reduce device complexity, then device complexity is reduced, but output range is restricted and power consumption increases
Solution Approach 1:
The power supply structure is segmented into two independent generators with distinct functions, which initially appears to increase complexity. However, this segmentation enables independent optimization of each generator, allowing the system to achieve both reduced power consumption and enlarged output range while maintaining manageable overall complexity through modular design.
Solution Approach 2:
The control unit serves multiple functions: it controls the second power generator, adjusts the second voltage VSS, stabilizes the voltage output, and coordinates between the two power generators. This multi-functionality consolidates control logic into a single component, offsetting the added complexity of having two power generators.
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 allows for reduced power consumption in power-saving modes and increased output range in normal modes without curtailment of signal amplitudes, while also preventing current variations from affecting multiple amplifier systems.
Implementation Method 1
the charge pump is substantially composed of capacitors and thereby, generates the Voltage VSS via charging and discharging of the capacitors
Data Source
AI summary
A power supply device for driving first and second amplifiers includes a first power generator, a second power generator, a charge pump and a control unit. The first power generator provides a first voltage for first power reception ends of the first and second amplifiers. The second power generator provides a second voltage. The charge pump is coupled between the second power generator and a second power reception end of the first amplifier and between the second power generator and a second power reception end of the second amplifier, and is used for generating a third voltage for the first and second amplifiers according to the second voltage. The control unit is coupled to the second power generator and is used for controlling the second power generator, so as to adjust the second voltage to make the third voltage equal to a multiple of the first voltage.