Push-Pull Control Circuit With Delayed Masking Against Shoot-Through
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Solution Overview
Problem
Conventional push-pull circuits face issues where complementary transistors can accidentally turn on simultaneously, leading to excessive current and potential circuit damage due to improper control of high-side and low-side transistors.
Innovation Solution
A control circuit comprising an inverter, delayed clocks, mask circuits, and logic determining circuits generates control signals to prevent simultaneous turn-on of transistors by filtering out delay signals within specific time periods, ensuring safe operation and preventing accidental transistor activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional push-pull circuits control high-side and low-side transistors without additional protection mechanisms, then the circuit structure remains simple, but the transistors may accidentally turn on simultaneously causing excessive current and potential circuit damage
Solution Approach 1:
The control circuit introduces delay circuits that advance the turn-off action of transistors before the expected simultaneous switching point. By delaying the control signals appropriately, the circuit ensures one transistor is already off before the other turns on, preventing shoot-through current in advance
Solution Approach 2:
The patent introduces mask circuits as intermediary components that mediate between the control signals and the transistor gates. These mask circuits filter and condition the control signals to ensure proper timing relationships, acting as a buffer that prevents direct simultaneous activation of complementary transistors
2Reliability
If delay circuits are introduced to prevent simultaneous transistor turn-on, then transistor operation safety is improved, but the control circuit complexity increases due to additional mask circuits and delay elements
Solution Approach 1:
The control circuit is segmented into distinct functional modules: delay circuits for timing adjustment, mask circuits for signal filtering, and logic determining circuits for control decision. This segmentation allows each component to perform its specific function independently, making the overall complex system manageable and maintainable
Data Source
AI summary
A control circuit for generating a first control signal and a second control signal includes: an inverter, used for generating an inverted clock according to an input clock; a first delay circuit, used for generating a first delay control signal; a second delay circuit, used for generating a second delay control signal; a first mask circuit, used for generating a first mask signal according to the input clock; a second mask circuit, used for generating a second mask signal according to the inverted input clock; a first logic determining circuit, used for generating the first control signal to the first delay circuit according to the second mask signal and the input clock; and a second logic determining circuit, used for generating the second control signal to the second delay circuit according to the first mask signal and the inverted clock.