Self-Synchronizing DC/DC Converter for Auxiliary Bias
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Solution Overview
Problem
Existing auxiliary power or bias voltage supplies face inefficiencies and limitations in generating regulated voltages from low input voltages, particularly at very low voltage inputs, and struggle to operate over a wide temperature range while meeting dynamic load demands and multiple output voltage requirements.
Innovation Solution
A step-up switch mode DC/DC power converter topology is employed, utilizing a transformer with multiple windings, a converter switch, and an error circuit to generate multiple regulated output voltages, including both positive and negative polarities, while synchronizing with dynamic loads and operating efficiently across a wide temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a linear regulator is used to generate a regulated bias voltage, then the bias voltage is regulated, but the efficiency is relatively high due to energy dissipation through the regulating element
Solution Approach 1:
The patent replaces the linear regulator (analog control mechanism) with a switched-mode power converter using pulse-width modulation (PWM). The PWM controller switches the power transistor on and off rapidly, with the duty cycle controlling the output voltage. This substitution of continuous analog regulation with discrete switching control eliminates the continuous energy dissipation inherent in linear regulators, achieving high efficiency while maintaining voltage regulation through feedback control.
Solution Approach 2:
The patent employs periodic switching action in the power converter, where the power transistor is switched on and off at fixed frequency intervals. The PWM controller generates periodic gate drive signals that cause the power transistor to operate in switch mode rather than linear mode. This periodic switching allows energy to be transferred in discrete packets through the transformer, minimizing energy loss while maintaining regulated output through duty cycle control.
2Adaptability or versatility
If multiple linear regulators are used to provide multiple output bias voltages, then multiple bias voltages are available, but the cost increases substantially
Solution Approach 1:
The patent implements a universal power converter architecture where a single switched-mode power converter with a transformer provides multiple isolated output voltages. By configuring the transformer with multiple secondary windings, the system can simultaneously generate multiple different bias voltages (e.g., +5V, +12V, -5V) from a single primary input. This multi-functional design eliminates the need for multiple separate linear regulators, reducing component count, cost, and board space while maintaining the capability to supply multiple voltage rails.
3Ease of operation
If the auxiliary power supply operating frequency is not synchronized with the main converter, then the auxiliary supply operates independently, but switching interaction with the main converter increases
Solution Approach 1:
The patent implements frequency synchronization by using feedback from the main converter's switching activity to control the auxiliary power supply's oscillator. The auxiliary PWM controller monitors the main converter's switching frequency and adjusts its own switching frequency to match. This feedback mechanism ensures that both power converters operate at the same frequency, preventing harmful switching interactions and electromagnetic interference while allowing the auxiliary supply to maintain independent voltage regulation through its own control loop.
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 efficiently steps up low input voltages to generate regulated bias supply voltages, reduces switching interaction with the main converter, and maintains efficiency and synchronization with dynamic loads, achieving compact design and wide operational temperature range.
Implementation Method 1
A bias voltage supply to supply multiple regulated bias supply potentials to dynamic loads may be summarized as including a DC/DC converter including a transformer having at least two windings and a core
Data Source
AI summary
An auxiliary power supply or bias voltage supply employs a step up switch mode DC/DC power converter topology to supply regulated bias supply voltages, from very low input voltages (e.g., less than 2V). The supply will synchronize to dynamic loads making it particularly useful in circuits with periodic high peak current power demands, for example, gate drive circuits employed in regulated switched mode power converters. When unladed, the supply will efficiently adjust its cycle period to the minimum required to maintain the desired boosted output voltage. Additional transformer windings or a charge pump may be used to generate additional vias voltage sources.