Frequency Converter Serial Clock Synchronization
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Solution Overview
Problem
Existing frequency converters are complex to manufacture and have reliability issues due to the need for precise synchronization and separate high-precision clock pulse generators for control and power units.
Innovation Solution
A frequency converter design with a control unit and power unit that utilize a serial interface for bidirectional data exchange, where the power unit clock pulse is adjusted based on signals received from the control unit, eliminating the need for a separate synchronization channel and allowing for phase-locked synchronization without external precise time references.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate high-precision clock pulse generators are used for control and power units, then synchronization precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the clock pulse generation function into a single control unit, eliminating the need for separate high-precision clock pulse generators in both control and power units. The control unit generates clock pulses that are transmitted to the power unit, reducing the number of components while maintaining synchronization precision through the serial interface communication protocol.
Solution Approach 2:
The patent introduces a serial interface as an intermediary mechanism for transmitting clock pulses and synchronization signals from the control unit to the power unit. This mediator enables precise synchronization without requiring independent high-precision oscillators in each unit, thereby reducing device complexity while maintaining timing accuracy.
2Measurement precision
If separate high-precision clock pulse generators are used for control and power units, then synchronization precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent consolidates the clock pulse generation functionality into a single control unit, eliminating the need for duplicate high-precision oscillators in the power unit. This merging reduces component count, material costs, and assembly complexity, making the frequency converter more cost-effective to manufacture while maintaining synchronization precision through the serial communication interface.
Solution Approach 2:
The patent replaces expensive high-precision clock pulse generators in the power unit with a more cost-effective implementation that uses the serial interface to receive timing signals from the control unit. This substitution reduces manufacturing costs while achieving the required synchronization precision for operational reliability.
3Device complexity
If a serial interface is used for data exchange between control and power units, then device complexity is reduced, but synchronization reliability may worsen
Solution Approach 1:
The patent implements feedback mechanisms within the serial interface communication protocol, where the control unit monitors and adjusts timing signals based on received data from the power unit. This feedback ensures that synchronization is maintained reliably despite the simplified architecture, preventing data loss or timing errors that could compromise operational reliability.
Solution Approach 2:
The patent incorporates error handling and data validation mechanisms in the serial interface that prepare for and cushion against potential communication errors before they affect synchronization. By implementing checksums, acknowledgment protocols, and retransmission capabilities, the system maintains synchronization reliability without requiring complex hardware redundancy.
Data Source
AI summary
A frequency converter control unit has: a serial control unit interface, a control unit clock pulse generator for generating a control unit clock pulse, and a control unit processor which is designed to define a control parameter depending on an actual value. A power unit has a data connection to the control unit and has several power semiconductors, a power unit clock pulse generator for generating an adjustable power unit clock pulse, a serial power unit interface, a clock pulse generator adjustment unit which has a signal connection to the power unit interface and which adjusts the power unit clock pulse depending on signals received by the power unit on the power unit interface, a power unit processor which controls the power semiconductors depending on the control parameter and the power unit clock pulse, and a sensor unit that determines the actual value. The control unit transmits the control parameter via the control unit interface to the power unit. The power unit transmits the actual value via the power unit interface to the control unit.