Primary-Side TOP Switch State Detection via Level Shifter Current
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Solution Overview
Problem
Existing integrated circuit configurations for power semiconductor switches in bridge topology lack the ability to provide error feedback from the secondary side to the primary side, particularly for the switched state of the TOP switch, due to the absence of a mechanism for detecting and interpreting the current flow through level shifters.
Innovation Solution
A monolithically integrated circuit configuration that utilizes an existing level shifter for potential-free actuation of the secondary side, with additional circuit sections on the primary side for detecting and interpreting the current flow through the level shifter, allowing for the detection of switched states by defining threshold values for the current flow, enabling primary-side detection of the switched state of the TOP switch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a level shifter is used for potential-free actuation of the secondary side, then the isolation between primary and secondary sides is achieved, but the ability to detect the switched state of the TOP switch on the primary side is lost
Solution Approach 1:
The patent implements feedback by detecting the current flow through the level shifter on the primary side. The circuit section monitors the current that flows when the TOP switch changes state, converting this current signal into a detectable voltage signal that provides feedback about the switch's operational state to the primary side control circuitry.
Solution Approach 2:
The level shifter itself serves as an intermediary that not only transfers control signals from primary to secondary side but also carries information about the TOP switch state. By monitoring the current flow through this intermediary component, the system extracts state information without breaking the isolation barrier.
2Device complexity
If monolithic integration is implemented for power switches, then the device complexity is reduced, but the capability for error detection and feedback is limited
Solution Approach 1:
The level shifter is designed to perform multiple functions: it acts as a potential isolation element for control signal transmission, serves as a current carrier for state information feedback, and functions as a detection point for monitoring TOP switch operations. This multi-functionality allows error detection capabilities to be integrated without adding separate dedicated components.
Solution Approach 2:
The system uses the existing current flow through the level shifter (which is already present for control signal transmission) to simultaneously provide error detection functionality. The same physical phenomenon that enables control signal transfer also carries the state information, making the system self-diagnostic without requiring additional active components.
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
Enables reliable detection and interpretation of the switched state of the TOP switch on the primary side, allowing for error detection and feedback, thereby improving the operational reliability of the electronic power system.
Implementation Method 1
the actuation signal from a superordinate control is processed in a first subcircuit of a primary side, and, via further components, supplied to the driver circuits, the secondary sides and lastly to the control input of the particular power switch
Implementation Method 2
A first lower threshold value of this current through the level shifter, detected on the primary side, is assigned to the not-switched-on TOP switch, and a second upper threshold value is assigned to the switched-on TOP switch
Data Source
AI summary
An integrated circuit configuration is provided comprising a primary side and a secondary side, for actuating power switches disposed in bridge circuit topology as well as an associated method. The primary side comprises a signal processing means and a level shifter for the potential-free actuation of the secondary side. The secondary side, in turn, comprises a signal processing means as well as a driver stage for the TOP switch. For the detection of the switched state of the TOP switch on the primary side, this side comprises a circuit section for the detection and interpretation of a current flow through a level shifter. A first lower threshold value of this current through the level shifter detected on the primary side is assigned to the not-switched-on TOP switch of the bridge circuit, and a second upper threshold value of this current through the level shifter detected on the primary side is assigned to the switched-on TOP switch of the bridge circuit.