Integrated Snubber Circuit for Inductive Kick and ESD Protection
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Solution Overview
Problem
Integrated circuit devices face challenges in protecting against power events such as inductive voltage kicks and electrostatic discharge (ESD) events, as external snubber circuits can expose the device to ESD during manufacturing and handling, adding complexity and cost.
Innovation Solution
An integrated circuit with a snubber circuit and voltage protection circuit that directs energy from inductive voltage kicks and ESD events to a voltage protection circuit, integrated within the device, using a switch to selectively connect the snubber circuit to the external transformer and protect the transistor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an external snubber circuit is used to protect against inductive voltage kick, then the transistor is protected from excessive voltage, but the integrated circuit device is exposed to ESD events during manufacture, assembly, and handling
Solution Approach 1:
The patent combines the snubber circuit and ESD protection circuit into a single integrated circuit device. The snubber circuit is formed using thin film resistors and capacitors deposited directly onto the semiconductor substrate, eliminating the need for external discrete components. This integration removes exposed connection pins that would otherwise be vulnerable to ESD events during manufacturing and handling, while maintaining protection against inductive voltage kick from the transformer.
2Reliability
If external discrete circuit components are used to implement the snubber circuit, then voltage protection is provided, but additional costs and complexity are added
Solution Approach 1:
The patent integrates the snubber circuit, ESD protection circuit, and transformer driver circuit into a single integrated circuit device. The snubber circuit components (resistors and capacitors) are formed using thin film deposition techniques directly on the semiconductor substrate, eliminating the need for external discrete components and reducing overall device complexity.
Solution Approach 2:
The integrated circuit device performs multiple functions: it provides snubber circuit protection against inductive voltage kick, ESD protection against electrostatic discharge events, and transformer driver functionality to control the external transformer. This multi-functionality is achieved within a single device, reducing the total number of components and simplifying the overall system.
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 solution provides enhanced protection against both inductive voltage kicks and ESD events using a single voltage protection circuit, reducing costs and complexity by integrating the snubber circuit within the integrated circuit, thereby safeguarding the transistor from excessive voltage levels.
Implementation Method 1
The transformer may produce an inductive voltage, sometimes referred to as an inductive voltage kick, when the transistor is shut off
Implementation Method 2
The inductive winding of the transformer continues to drive current, even when the voltage supply to the inductive winding is removed
Data Source
AI summary
A powered device includes a voltage protection circuit, two outputs, a switch, and a snubber circuit. The two outputs of the integrated circuit may be coupled to an external transformer. The snubber circuit of the integrated circuit is responsive to the switch and is coupled with respect to the two outputs to direct energy from at least one of the two outputs to the voltage protection circuit.