KEPCO BOP-20-20M – Bipolar Operational DC Power Supply | BOP Series Platform
Engineering Background
The KEPCO BOP (Bipolar Operational Power) series represents over five decades of precision power engineering, purpose-built for test, measurement, and industrial automation environments where both positive and negative output polarities are required from a single instrument. The BOP-20-20M is the flagship mid-range model in this series, delivering ±20 V and ±20 A in a true 4-quadrant operational mode.
Product Positioning
Designed for procurement engineers and system integrators sourcing a programmable, rack-mountable bipolar supply for ATE (Automated Test Equipment), semiconductor characterization, electrochemical research, and servo amplifier simulation. The BOP-20-20M bridges the gap between bench-top flexibility and production-grade reliability, making it the preferred choice for demanding R&D and manufacturing environments.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Model | BOP-20-20M |
| Manufacturer | KEPCO, Inc. |
| Series | BOP (Bipolar Operational Power Supply) |
| Output Voltage Range | ±20 V DC (bipolar) |
| Output Current Range | ±20 A DC (bipolar) |
| Maximum Output Power | 400 W |
| Operating Quadrants | 4-quadrant (source & sink, voltage & current) |
| Voltage Regulation (Load) | ≤ 0.01% + 2 mV |
| Current Regulation (Load) | ≤ 0.01% + 2 mA |
| Ripple & Noise (Voltage) | ≤ 3 mV rms |
| Ripple & Noise (Current) | ≤ 6 mA rms |
| Programming Interface | GPIB (IEEE-488.2) / RS-232 (model dependent) |
| Analog Programming | 0–10 V / 0–10 mA external reference |
| Bandwidth (−3 dB) | DC to 10 kHz (voltage mode) |
| Input Voltage | 115/230 V AC ±10%, 47–63 Hz |
| Form Factor | 3U Rack-mount (19-inch EIA) |
| Dimensions (H×W×D) | 133 × 483 × 508 mm |
| Weight | ~21.5 kg |
| Operating Temperature | 0°C to +50°C |
| Storage Temperature | −40°C to +85°C |
| Compliance | CE, UL, CSA |
Proven Application Environments
- ATE & Semiconductor Test: Bipolar output enables both forward and reverse bias testing of diodes, transistors, and ICs in a single instrument pass.
- Electrochemical & Battery Research: 4-quadrant operation supports charge/discharge cycling and impedance spectroscopy setups.
- Servo & Motor Drive Simulation: High bandwidth (DC–10 kHz) replicates dynamic load profiles for servo amplifier validation.
- Aerospace & Defense ATE: Programmable via GPIB/RS-232 for integration into MIL-STD test racks and automated calibration systems.
- University & Industrial R&D Labs: Trusted by leading research institutions for precision analog stimulus generation.
Engineering Advantages
- True 4-Quadrant Operation: Sources and sinks both voltage and current without relay switching — zero crossover distortion.
- High Bandwidth Linear Design: Unlike switching supplies, the BOP-20-20M uses a linear topology for ultra-low noise and fast transient response.
- Dual-Mode Control: Seamlessly transitions between constant voltage (CV) and constant current (CC) modes with automatic crossover.
- Programmable via GPIB/RS-232: Full remote control of output voltage, current limits, and protection thresholds — compatible with LabVIEW, MATLAB, and Python VISA drivers.
- Analog Input Programming: External 0–10 V reference allows direct integration with DAQ cards and waveform generators for arbitrary waveform output.
- Robust Protection Suite: OVP (over-voltage), OCP (over-current), and thermal shutdown with front-panel fault indication.
System Architecture & Signal Flow
The BOP-20-20M employs a linear pass-element topology with a high-gain error amplifier referenced to an ultra-stable internal voltage reference. The output stage operates in all four quadrants by using complementary NPN/PNP transistor arrays, allowing the supply to both deliver and absorb current at any polarity. The control loop bandwidth extends to 10 kHz, enabling the unit to track rapidly changing reference signals — a critical requirement for dynamic load simulation and waveform generation applications.
Digital programming commands (GPIB/RS-232) are parsed by an onboard microcontroller that converts setpoints to precision DAC outputs, which then drive the analog control loop. This hybrid architecture ensures the speed and noise performance of a pure analog supply with the repeatability and automation capability of a fully programmable instrument.
Sourcing & Quality Verification
- Origin: KEPCO, Inc. — Flushing, New York, USA. Established 1946.
- Condition: New / Refurbished / Surplus — please confirm with our team at time of inquiry.
- Traceability: Serial number and date code verified against KEPCO factory records upon request.
- Calibration: NIST-traceable calibration certificate available as an add-on service.
- Warranty: 12-month Konmask warranty on all verified units; OEM warranty honored where applicable.
- Export Compliance: EAR99 classification — no export license required for most destinations.
Procurement Process
- Submit RFQ: Contact support@konmask.com with quantity, required condition, and delivery timeline.
- Receive Quotation: Formal quotation with lead time, unit price, and shipping options within 24 business hours.
- Order Confirmation: PO accepted via email; payment terms available for qualified accounts.
- Inspection & Dispatch: Each unit undergoes functional verification before shipment; tracking provided.
- After-Sales Support: Technical support available via email and phone throughout the warranty period.
Technical FAQ
Q: Can the BOP-20-20M operate as a current sink (absorb current from an external source)?
A: Yes. As a true 4-quadrant supply, it can sink current in both positive and negative voltage modes — ideal for battery discharge testing and regenerative load simulation.
Q: Is the BOP-20-20M compatible with LabVIEW and Python?
A: Yes. KEPCO provides IVI-compliant drivers for LabVIEW, and the GPIB/RS-232 command set is fully documented for use with PyVISA and other SCPI-compatible libraries.
Q: What is the difference between the BOP-20-20M and BOP-20-20D?
A: The “-M” suffix denotes the GPIB + RS-232 interface version. The “-D” suffix typically indicates a different interface or front-panel configuration — confirm with KEPCO documentation for your specific revision.
Q: Can multiple BOP units be connected in series or parallel?
A: Series connection for higher voltage is supported with proper isolation precautions. Parallel operation requires external current-sharing circuitry. Consult the KEPCO BOP application note AN-B-001.
Q: What is the minimum order quantity?
A: Single units are available. Volume pricing applies for orders of 3+ units.
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