Programmable DC Power Supply: Principles, Usage, Brand,Troubleshooting, and Models Serviced

I. Principles of Programmable DC Power Supply

Programmable DC power supplies are advanced power equipment integrating control circuits, power conversion circuits, and switching regulator circuits. They feature high precision, strong stability, and high programmability. By utilizing digital control methods, these power supplies precisely regulate output voltage and current, making them widely applicable in scientific research, industrial production, and communication fields.

Core Components:

• Power Module: Converts input AC to stable DC for load use, involving rectification, filtering, and voltage regulation.
• Control System: Utilizes DSP and microcontrollers to receive user inputs or programming instructions, precisely adjusting the output parameters of the power module to ensure stable output voltage and current.

II. Usage of Programmable DC Power Supply

When using a programmable DC power supply, follow these steps:

1. Connect Power: Properly connect the power supply to an AC power socket and ensure stable power lines.
2. Set Parameters: Use the device’s control panel or software interface to set the required output voltage and current parameters, adjusting them to meet the experimental needs of the tested equipment.
3. Connect Load: Use output cables to connect the power supply to the electronic device under test, ensuring a secure connection to avoid voltage drops.
4. Start Power Supply: Press the start button to begin outputting voltage and current. Monitor and adjust output parameters as needed during operation.
5. Experiment & Testing: Observe the reaction and performance of the tested device, adjusting the output voltage and current as necessary to ensure stable operation during the experiment.
6. Turn Off Power: After the experiment or test, promptly turn off the power supply and disconnect it from the tested device.

III. Troubleshooting and Repair Methods for Programmable DC Power Supplies

Programmable DC power supplies may encounter various faults during use. Here are some common faults and their repair methods:

• No Output Voltage:
  • Check if the power switch is on.
  • Ensure reliable connection between the input power and input terminals.
  • Check if the DC power supply is in overload protection mode.
• Unstable Output Voltage:
  • Check and stabilize the input voltage within a reasonable range.
  • Consider paralleling TVS or Zener diodes at the input if there is interfering voltage.
  • Check for load overload or short circuit, and adjust or replace the corresponding external circuit.
• Excessive Output Ripple Noise:
  • Adjust or optimize the power supply design as needed, such as increasing filter capacitors.
• Sudden Power Shutdown:
  • Check if the display is on to confirm power supply operation.
  • Inspect the input circuit for sparking or load overload/short circuit, which may cause the input control switch to trip. If tripped, disconnect the load and wait 1-2 minutes before attempting to restart.
• Fluctuating Output Voltage:
  • Check if the DC power supply is operating overloaded and remove excess load.
  • Ensure secure and reliable connections between input/output terminals and wires.
• Inability to Increase No-Load Voltage or Adjust Output Voltage in Constant Current Mode:
  • Ensure the “current adjustment” is not set to zero and understand the concepts of “constant voltage” and “constant current” for proper adjustment.

IV. Models of Programmable DC Power Supplies Serviced by Longi Electromechanical

1. Keysight Technologies (formerly Agilent Technologies):

• N8900 Series: N8920A (20 kW), N8937A (15 kW)
• N6700 Series: N6705C (600W modular DC power supply), N6702C (400W modular DC power supply)
• B2900A Series: B2912A precision power supply

2. Tektronix:

• Keithley Series: 2260B-800-1 (800V, 1.44kW), 2230G-30-1 (3-channel programmable power supply)
• PA1000 Series: PA1000 (single-channel power analyzer)

3. Rohde & Schwarz:

• HMP Series: HMP4040 (4-channel programmable power supply), HMP2020 (2-channel programmable power supply)
• NGA100 Series: NGA142 (2-channel, 200W), NGA102 (single-channel, 80W)

4. Chroma:

• 62000D Series: 62012D-600-8 (600V, 8A, 1200W), 62006D-1000-6 (1000V, 6A, 600W)
• 62000P Series: 62024P-40-120 (40V, 120A, 2400W), 62012P-600-8 (600V, 8A, 1200W)

5. TDK-Lambda:

• GENESYS Series: GEN60-25 (60V, 25A), GEN150-10 (150V, 10A)
• Z+ Series: Z+200-5 (200V, 5A), Z+400-3.3 (400V, 3.3A)

6. Sorensen (AMETEK Programmable Power):

• SGX Series: SGX60-500 (60V, 500A), SGX150-300 (150V, 300A)
• XG Series: XG 170-12.5 (170V, 12.5A), XG 60-40 (60V, 40A)

7. GW Instek:

• PSW Series: PSW 80-13.5 (80V, 13.5A), PSW 160-7.2 (160V, 7.2A)
• GPP Series: GPP-6030 (60V, 3A), GPP-4323 (32V, 3A)

8. Aim-TTi:

• PLH Series: PLH250-P (250V, 1A), PLH120-P (120V, 1.5A)
• QPX Series: QPX600DP (600V, 1.2A), QPX1200SP (60V, 50A)

9. BK Precision:

• 9200 Series: 9201 (60V, 5A), 9205 (250V, 2A)
• 8500 Series: 8512 (60V, 60A, 1200W), 8514 (500V, 15A, 3000W)

10. Rigol:

• DP800 Series: DP832 (30V, 3A), DP831A (30V, 3A)
• DP2000 Series: DP2116A (160V, 20A), DP2216A (160V, 20A)

11. EA Elektro-Automatik:

• PSI 9000 Series: PSI 9200-120-30 (120V, 30A), PSI 9360-48-180 (48V, 180A)
• ELR 9000 Series: ELR 9080-170-160 (80V, 160A), ELR 9210-30-75 (210V, 75A)

12. TDK-LAMBDA (Japan):

• ZUP Series: Various models including ZUP6-33, ZUP10-20, etc.
• GENESYS+™ Series
• GEN Series: Various models including GEN80-65, GEN100-50, etc.
• GH Series: GH40-38

13. ZEEMAN:

• DLC Series: DLC6000, DLC5000

Longi Electromechanical Company specializes in the long-term maintenance of programmable DC power supplies (including Leman power supplies and other DC power supplies), with nearly 30 years of experience in repairs, enabling us to quickly repair various instruments. Additionally, we recycle and sell various types of used programmable DC power supplies (including Leman power supplies and other DC power supplies). Welcome to consult us.