Inverter Pull-Up/Pull-Down Circuit for Cross-Conduction Limiting
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Solution Overview
Problem
Inverter applications are prone to noise and interference, leading to undesirable current flow across switching transistors, which can cause unintended state changes and increased cross-conduction during switching operations, particularly in noisy environments like battery management systems.
Innovation Solution
A circuit design featuring a tying transistor and a biasing circuit connected to a local drive signal, which biases the tying transistor to prevent unintended state changes and reduces cross-conduction by using a common resistor to limit unwanted current flow, along with a voltage divider to ensure proper switching in the presence of noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a common resistor is added to limit cross-conduction current, then cross-conduction is reduced, but device complexity increases
Solution Approach 1:
A common resistor is introduced as an intermediary element connected to the drain terminals of both inverter transistors. This resistor acts as a mediator that limits the cross-conduction current flowing between the transistors during switching operations, thereby reducing the harmful current without requiring fundamental changes to the inverter structure.
Solution Approach 2:
The circuit is segmented by adding the common resistor as a separate functional element distinct from the inverter transistors. This segmentation allows the resistor to independently perform the cross-conduction limiting function while maintaining the original inverter transistor operations, enabling modular improvement of the circuit.
2Reliability
If a tying transistor with biasing circuit is added to prevent unintended state changes, then reliability improves, but device complexity increases
Solution Approach 1:
The tying transistor is activated in advance by the biasing circuit to establish a predetermined voltage state at the drive node before noise or interference can cause unintended state changes. This preliminary action ensures that the inverter transistors remain in their intended state, preventing noise-induced switching errors.
Solution Approach 2:
The biasing circuit provides continuous feedback control to the tying transistor based on the local drive signal, dynamically adjusting the tying transistor's operation to maintain the drive node at the correct voltage level. This feedback mechanism ensures reliable inverter operation even in the presence of noise and transient disturbances.
Data Source
AI summary
A circuit is disclosed, comprising: an inverter comprising first and second inverter transistors, each having: a gate terminal connected in common to a drive node, a source terminal, connected to respective first and second voltage rails, and a drain terminal connected to a common first resistor, wherein an inverter output node is connected between the first resistor and the drain terminal of a shorting one of the transistors; a tying transistor connected between the drive node and the voltage rails to which the shorting transistor is connected; a biasing circuit connected to the tying transistor's control terminal and configured to be controlled by a local drive signal and bias the tying transistor control terminal to a voltage such that the tying transistor ties the drive node of the relevant voltage rail in response to the drive signal having a first state; and a circuit for providing the local drive signal.