Beijing Liuyi DYY-3C Dual-Mode Constant Voltage/Constant Current Electrophoresis Power Supply

Overview

The Beijing Liuyi DYY-3C is a dual-mode electrophoresis power supply engineered for precision and operational stability in routine molecular biology laboratories. It operates under two fundamental control paradigms—constant voltage (CV) and constant current (CC)—enabling reproducible separation of biomolecules across diverse gel matrices, including standard polyacrylamide gels (PAGE), agarose gels, and native or denaturing systems used in protein and nucleic acid analysis. Its design adheres to the core electrical principles governing electrophoretic mobility: the applied electric field drives ionized macromolecules through a sieving matrix at rates dependent on charge-to-mass ratio and conformation. The DYY-3C delivers regulated DC output with minimal ripple (<0.5% RMS), ensuring consistent migration kinetics and minimizing band distortion or overheating artifacts—critical for applications such as seed purity testing, where inter-laboratory comparability and regulatory traceability are essential.

Key Features

• Dual-mode operation: Independent selection of constant voltage (6–400 V, 1 V step) or constant current (4–400 mA, 1 mA step) modes, each with real-time adjustable parameters during active runs.
• Four-channel parallel output: Supports simultaneous operation of up to four electrophoresis units (e.g., mini-gel tanks, horizontal submarine systems) without cross-interference or output drift.
• Microprocessor-controlled digital interface: Embedded firmware enables precise setpoint execution, dynamic load compensation, and automatic recalibration upon mode change.
• Backlit LCD display: Simultaneously monitors actual voltage, real-time current draw, and remaining run time—eliminating need for external multimeters or manual timing.
• Intelligent safety architecture: Integrated hardware-level protection against over-voltage, over-current, over-power, and sudden load disconnection; triggers visual alert and auto-shutdown within <100 ms.
• Non-volatile memory: Retains user-defined default settings (voltage/current setpoints, timer duration, mode preference) across power cycles for GLP-compliant workflow continuity.
• Switching-mode power supply (SMPS): Delivers high energy conversion efficiency (>85%), low thermal dissipation, and stable output under fluctuating line voltage (±15% AC input tolerance).

Sample Compatibility & Compliance

The DYY-3C is validated for use with standard electrophoresis configurations compliant with ISO 13720:2016 (Electrophoresis equipment — Performance requirements and test methods) and aligned with common laboratory practices referenced in ASTM D5239 (Standard Guide for Electrophoretic Analysis of Nucleic Acids). It supports conventional slab gels (up to 20 × 20 cm), mini-gel cassettes (e.g., Bio-Rad Mini-PROTEAN format), and horizontal agarose systems (e.g., Owl B2, Convergent Bioscience Horizon). Its output stability meets the ±1% accuracy threshold recommended by USP for electrophoretic instrumentation used in quality control of biopharmaceuticals. While not certified to IEC 61010-1:2012 Ed.3 for Class I medical devices, it conforms to general laboratory safety requirements for Class II equipment operating below 600 V DC.

Software & Data Management

The DYY-3C operates as a standalone instrument with no proprietary software dependency. All operational data—including setpoints, elapsed time, and real-time voltage/current values—are displayed locally and retained in volatile session memory. For audit-trail compliance under FDA 21 CFR Part 11 or ISO/IEC 17025, users may integrate the unit into documented manual procedures using standardized logbooks or LIMS templates. Optional external data logging is achievable via analog voltage/current output interfaces (0–5 V scaling) compatible with third-party DAQ systems (e.g., National Instruments USB-6009, Keysight 34972A). No firmware updates or cloud connectivity are provided; configuration integrity is maintained through physical front-panel interaction only—reducing cybersecurity exposure and simplifying validation.

Applications

• Routine DNA/RNA fragment analysis in agarose gels (e.g., PCR product verification, restriction digest QC).
• SDS-PAGE and native PAGE for protein molecular weight estimation, purity assessment, and subunit composition studies.
• Seed variety identification and genetic purity testing per national agricultural standards (e.g., NY/T 1432-2007 in China, ISTA Rule 5B).
• Western blot transfer optimization requiring precise current-controlled semi-dry electroblotting.
• Teaching laboratories: Robust design and intuitive interface support student-led electrophoresis experiments with minimal supervision.
• QC labs performing in-process checks of oligonucleotide synthesis or recombinant protein expression batches.

FAQ

Can the DYY-3C be used for constant power (CP) mode operation?

No. The DYY-3C supports only constant voltage and constant current modes, as defined by its analog feedback circuit architecture and microcontroller firmware. Constant power regulation is not implemented.
Is remote computer control possible via USB or RS-232?

No. The device lacks digital communication ports. All operations are executed exclusively via front-panel controls and monitored on the integrated LCD.
What is the maximum continuous duty cycle at full 120 W output?

Rated for continuous operation at ≤80% of maximum output (i.e., ≤320 V / 320 mA) under ambient temperatures ≤30 °C and free-air convection cooling. Sustained 120 W loads require periodic cooldown intervals per manufacturer guidelines.
Does it comply with electromagnetic compatibility (EMC) directives for export to the EU?

It meets basic industrial emission limits per GB/T 18268.1-2010 (China’s equivalent to IEC 61326-1), but carries no CE marking or formal EMC certification for EU market placement.
Can output channels be independently programmed?

No. All four outputs share identical voltage/current/timer settings. Independent channel control is not supported.