Single-Supply Bipolar Gate Drive for Power Switch Isolation
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Solution Overview
Problem
Traditional bipolar gate drive systems for power switches in three-phase AC/DC input fed motor drives are complex, bulky, and unreliable due to the use of dual power supplies, making it difficult to isolate and manage these supplies effectively.
Innovation Solution
A switch control system utilizing a single voltage source to generate bipolar gate drive voltage through integrated or separate gate drivers, which output inverted signals to create a bipolar voltage condition across the gate and source/emitter terminals of a switch, eliminating the need for dual power supplies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dual power supplies are used for bipolar gate drive, then bipolar voltage control is achieved, but system complexity and bulk increase
Solution Approach 1:
The patent combines two separate power supplies into a single power supply system. The single voltage source provides voltage to both gate drivers, which then generate the bipolar gate drive signals through complementary switching actions, eliminating the need for dual isolated power supplies while maintaining reliable bipolar voltage control
Solution Approach 2:
The single voltage source performs multiple functions by supplying power to both gate drivers simultaneously. This universal power source enables the generation of both positive and negative gate drive voltages through the coordinated operation of the two gate drivers, replacing the specialized dual power supply arrangement
2Reliability
If dual power supplies are used for bipolar gate drive, then bipolar voltage control is achieved, but system size and weight increase
Solution Approach 1:
The patent merges two separate power supply units into one consolidated voltage source. This single power supply feeds both gate drivers through a common voltage line, significantly reducing the overall weight of the gate drive power supply system while maintaining the capability to generate bipolar gate drive voltages
3Reliability
If dual power supplies are used for bipolar gate drive, then bipolar voltage control is achieved, but isolation and management difficulty increase
Solution Approach 1:
The patent combines two independent power supply systems into a single managed voltage source. This consolidation simplifies isolation and management by eliminating the need to handle two separate power supply connections, while the gate drivers internally manage the generation of bipolar voltages through their complementary switching operations
4Device complexity
If single voltage source is used for bipolar gate drive, then system complexity is reduced, but generating bipolar voltage becomes challenging
Solution Approach 1:
The patent segments the bipolar voltage generation function into two separate gate drivers, each handling one polarity. The first gate driver generates positive gate drive voltage when activated, while the second gate driver generates negative gate drive voltage when activated, together achieving reliable bipolar voltage control from a single power source
Solution Approach 2:
The patent uses an inverter to generate the complementary control signal for the second gate driver. When the first gate driver receives a high control signal and activates, the inverter outputs a low signal to keep the second gate driver inactive, and vice versa. This inverted control mechanism enables reliable bipolar voltage generation from a single voltage source
Data Source
AI summary
A switch control system can include a voltage source configured to output a source voltage on a voltage line, and a first gate driver connected to a gate control signal line 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 to output a first gate voltage signal to a first terminal of a switch. The system can include an inverter 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 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 to output a second gate voltage signal to a second terminal of a switch.