Bipolar Gate Drive Circuit Using One Supply Instead of Two
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Solution Overview
Problem
Traditional bipolar gate drive systems for power switches in AC/DC motor drive applications require dual power supplies, leading to complexity, bulkiness, and unreliability due to the need for separate voltage sources and their isolation.
Innovation Solution
A switch control system utilizing a single voltage source to generate bipolar gate drive voltage by integrating or hosting gate drivers on separate integrated circuits, with one gate driver connected to the gate and the other to the source/emitter, allowing selective output of source or ground voltage based on a control signal to create bipolar conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dual power supplies are used for bipolar gate drive, then bipolar voltage control is achieved, but system complexity and bulkiness increase
Solution Approach 1:
The patent combines the functions of two separate power supplies into a single power supply system. The first and second gate drivers are both powered from the same voltage source, eliminating the need for dual isolated power supplies while still achieving bipolar gate drive voltage through complementary switching actions of the two gate drivers.
Solution Approach 2:
A single power supply is designed to serve multiple functions: it provides power to both gate drivers simultaneously and enables the generation of both positive and negative gate drive voltages through the coordinated operation of the two gate drivers, making the power supply system more versatile and less complex.
2Adaptability or versatility
If dual power supplies are used for bipolar gate drive, then bipolar voltage control is achieved, but system reliability decreases
Solution Approach 1:
By merging the power supply functions into a single source that powers both gate drivers, the patent eliminates the failure points associated with dual isolated power supplies. The single power supply approach reduces the number of components that can fail and simplifies the isolation requirements, thereby improving overall system reliability while maintaining bipolar control capability.
3Adaptability or versatility
If dual power supplies are used for bipolar gate drive, then bipolar voltage control is achieved, but isolation difficulty increases
Solution Approach 1:
The patent resolves the isolation problem by combining the power supply into a single source with a common reference. Both gate drivers share the same ground reference and power source, which eliminates the complex isolation barriers that would be required between two separate power supplies while still enabling the generation of bipolar gate drive voltages through complementary switching.
Data Source
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AI summary
A switch control system can include a voltage source (101) configured to output a source voltage on a voltage line (103), and a first gate driver (105a) connected to a gate control signal line (107) to receive a gate control signal from a controller. The first gate driver can be connected to the voltage line to receive the source voltage, and the first gate driver can be connected to a first terminal line (109a) to output a first gate voltage signal to a first terminal (111a) of a switch (111). The system can include an inverter (113) connected to the gate control signal line configured to receive the gate control signal and output an inverted gate control signal. The system can include a second gate driver (105b) connected to the inverter to receive the inverted gate control signal from the inverter. The second gate driver can be connected to the voltage line to receive the source voltage, and the second gate driver can be connected to a second terminal line (109b) to output a second gate voltage signal to a second terminal (111b) of the switch.