Power Supply for the VNIR FPA camera and front end electronics

About the missionEnMAP is ready for science!

The EnMAP satellite was launched on 1. April 2022, has successfully completed its Flight Qualification Review (FQR) and thereby finished the Commissioning Phase (CP). On 2.November 2022 he started its routine operation phase. The hyperspectral mission is now delivering excellent data for scientific applications and more, seven months after its launch.

Technical Detector Concept
The EnMap Imaging Spectrometer FPAs require two different 2-dimensional detector array types, with one dimension for the spatial scan along a ground image line repre-sented by the spectrometer slit, the second dimension for the reproduction of the spectrum per either spectral regime.

The two detectors have a wavelength overlap of 100 nm for reference and matching the two spectra. The resulting image data together with the track of the satellite will then constitute the often quoted “image cube”, a data set with spatial and spectral information.

The VNIR power supply by APCON is integral part of the VNIR FPA electronics. It is located in a single box together with the camera front end electronics.

The VNIR FPA power supply shall permanently generate the supply voltage for the FEE digital controller and S/C interfaces. The detector voltages shall be generated as row voltage and will be finally conditioned on the FEE or the SA. The detector voltages shall be switched on and off via digital command signals from the FEE.


The VNIR power supply by APCON consists of the following functional blocks:

  • Input filterInput
  • Current Limiter with latch
  • Primary Under-Over-Voltage Protection
  • PWM Pre-Regulator
  • Push/Pull Power stage including transformer
  • Rectifier and Output Filter
  • Secondary Buck & Series Regulators
  • Monitoring (Power On Reset Circuit)
  • Monitoring (Output Current & Voltage
  • Measurement of Analog & Digital Voltages by ADC)
  • Measurement of Peltier Voltages by ADC)
  • DAC-Command Interface for the Peltier Voltage Control
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