Charge Pump Gate Drive Circuit for Switching Loss and Surge Control
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Solution Overview
Problem
Existing drive circuits for switching devices lack flexibility in controlling the switching process, particularly in adjusting the charging voltage of the charge pump, which limits the ability to optimize switching losses and surge voltages.
Innovation Solution
A drive circuit with a charge pump that includes a capacitor, where the charging voltage can be adjusted according to an order signal, allowing for independent control of the driving voltage during both ON and OFF stages, and incorporating a detector to maintain a predetermined driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed charging voltage is used in the charge pump, then the circuit structure is simple, but the control flexibility is limited
Solution Approach 1:
The patent applies the dynamics principle by making the charging voltage adjustable rather than fixed. The charge pump circuit is designed to accept variable control signals that dynamically adjust the charging voltage level, enabling flexible control of the switching device's gate voltage while maintaining a relatively simple circuit structure through modular design.
Solution Approach 2:
The patent implements parameter changes by allowing the charging voltage of the charge pump to be varied according to control signals. This enables adjustment of the gate voltage applied to the switching device, providing adaptability for different operating conditions without fundamentally changing the circuit architecture.
2Loss of energy
If the switching device turns ON and OFF quickly, then switching losses are reduced, but surge voltages may increase
Solution Approach 1:
The patent uses dynamics by implementing variable control over the gate voltage charging process. The charge pump can adjust the voltage rise rate dynamically, allowing fast switching when needed while controlling voltage surges through regulated voltage application. This enables optimization of both switching speed and voltage spike suppression.
Solution Approach 2:
The patent applies parameter changes by varying the gate voltage charging characteristics. By adjusting the charging voltage and control timing, the system can achieve rapid switching to reduce losses while simultaneously limiting voltage surges through controlled parameter adjustment during the switching transition.
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 approach enables flexible control of the switching device, reducing switching losses and suppressing surge voltages by adjusting the charging voltage and discharging process, thereby improving the overall efficiency of the switching process.
Implementation Method 1
a charge pump including a capacitor Cx. The capacitor Cx is configured to be charged in the first stage, and to be connected to the gate terminal of the switching device in the second stage
Data Source
AI summary
A drive circuit is provided with a charge pump including a capacitor. The capacitor of the charge pump is configured to be charged in the first stage and to be connected with the gate terminal of the switching device in the second stage. The charge pump is configured to be able to adjust a charging voltage charged in the capacitor according to an order signal.