Power Converter Negative Voltage Generation
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Solution Overview
Problem
Conventional power converters require complex external circuits or increased chip size and pin count to provide a negative voltage, leading to increased costs and energy consumption.
Innovation Solution
A power converter with a coupling controller circuit and a reverse voltage converter circuit that can be turned on or off by a digital control signal, utilizing a simple circuit configuration and low energy consumption, including switches and logic circuits to manage voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a level shifting circuit is connected externally to provide negative voltage, then the ground terminal can be connected to ground voltage level, but the circuit complexity increases and external components are required
Solution Approach 1:
The patent integrates the level shifting function directly into the power converter chip by incorporating a reverse voltage converter circuit that generates negative voltage internally. This merging of functions eliminates the need for external level shifting circuits while maintaining reliable ground connection through the integrated negative voltage generation capability.
Solution Approach 2:
The reverse voltage converter circuit serves multiple functions: it generates the negative voltage required for level shifting, provides the ground reference connection, and enables the power converter to operate with negative output voltages. This multi-functionality replaces what would traditionally require separate external circuits.
2Reliability
If the level shifting circuit is disposed inside the chip, then the ground terminal can be connected to ground voltage level, but the quantity of pins on the chip must be increased
Solution Approach 1:
The patent combines the level shifting functionality with the existing power converter circuitry by integrating the reverse voltage converter. This integration allows the ground terminal to be connected to ground voltage level without requiring additional dedicated pins, as the negative voltage generation is achieved through the integrated circuit architecture using existing pin assignments.
3Reliability
If more pins are added to the chip, then the ground terminal can be connected to ground voltage level through level shifting, but more area on the chip is occupied and chip size must be increased
Solution Approach 1:
The patent merges the level shifting function into the existing power converter chip architecture through the integrated reverse voltage converter circuit. This approach achieves reliable ground connection without requiring additional pins or increasing chip area, as the negative voltage generation utilizes the existing circuit layout and component placement efficiently.
4Device complexity
If a conventional power converter is used without negative voltage capability, then the circuit structure is simple, but it cannot be turned off by an enable signal and requires complex external circuits
Solution Approach 1:
The patent enhances the power converter by integrating the reverse voltage converter circuit that enables the device to generate negative voltages and respond to enable signals for shutdown control. This integration maintains relatively simple circuit structure while adding the versatility of enable signal control and negative voltage output capability.
Data Source
AI summary
A power converter for providing a negative voltage is provided. A coupling controller circuit receives a digital control signal and provides a control signal. A reverse voltage converter circuit receives the control signal and provides a reverse voltage. The reverse voltage converter circuit includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a seventh switch, an eighth switch, a coupling control signal triggering circuit and a pulse width modulation circuit. A first reverse logic circuit is connected to a second reverse logic circuit. The second reverse logic circuit is connected to the pulse width modulation circuit and is configured to provide a trigger signal to the pulse width modulation circuit. The pulse width modulation circuit turns on or off the reverse voltage converter circuit according to the trigger signal.