DPSI RV - Regulated Voltage

The voltage for the receiver AND the servos is regulated at a constant value for the first time in this new range of products. The problems that arise with traditional fully loaded 5-cell batteries are therefore eliminated. The entire receiver station is now supplied with stable voltage, which the user can adjust via jumper to a range of 5.0 to 5.9 volts. Thus allowance is made for every type of application.

For the first time, a micro-controller is integrated into the DPSI RV, which monitors the battery voltages by means of an intelligent algorithm. When the battery (or batteries) is/are 60-70% discharged, this status is acoustically announced by a built-in buzzer. This rules out the risk of empty batteries. There is always enough reserve to complete a flight and then charge the batteries.

The generous dimensions of the cooling surfaces and the voltage control now make it possible to use new battery technology such as lithium-ion or lithium-polymer cells. These extremely light cells have an energy density up to 400% greater than NiCd cells, for example. This means: high capacity with low weight. The LongGo batteries are the premium product among the lithium-polymer power sources. Two selected and matched lithium-polymer cells are each assembled on a high performance receiver battery, which is available in four different capacities. 1200 milli amps/h at 2.1 oz(60g) weight, 1500 milli amps/h at 3 oz (85grams), 2000 milli amps/h at 4.3 oz (122grams) and 3300 milli amps/h at 5.8 oz (167 grams). These batteries can withstand currents of up to 20 amps. With parallel connection of two battery packs by means of the DPSI-RV, peak currents of up to 40 amps are possible without any problems, without the voltage breaking down.


The DPSI RV is suitable for all large models (motorized models, jets, airliners, large gliders, etc. 12 receiver channels can be distributed to a total of 32 steering gears in this case. Thus there are always up to 4 servo connections available for all important functions.

The DPSI RV Mini 5 is suitable for medium-sized motorized models (approx. 2.20 m - 2.70 m wingspan). Here, as a rule, 2 servos are used for each aileron, for the elevator 1 servo each per rudder flap and 2 servos for the vertical rudder, if required. Additional servos (gas, choke, tow release or the like) are then attached directly to the receiver. In this way, all servos that use a lot of power and have long connection cables are supplied directly by means of the DPSI.

The DPSI RV Mini 6, for example, is of interest for models with 4 surface servos (jets, gliders). Here 4 channels for the rudder flaps are used in the wings (aileron left, landing flap left, landing flap right, aileron right). The two remaining channels are provided for the vertical rudder (1 servo) and the elevator (2 servos, e.g. one each per rudder). The turbine ECU (or tow release, landing gear, etc.) is then plugged directly to the receiver, for example.

The DPSI Mini 5 ESP is based on the DPSI Mini 5 and possesses 3 additional connectors with MPX high current sockets (ESP = Extra Servo Power). These 3 connections carry the switched battery voltage which results from both connected batteries. When using 2-cell LongGo batteries approximately 7.4 volts are supplied on these sockets. This (unregultated) voltage can be used for high performance servos which use 7.4 volts (e.g. HITEC roboter servos HS5995-TG Digi CA or Tonegawa-Seiko PS 050 drone servos). Toegawa servos also accept 3-cell LiPo batteries (see also LongGo "Normal") where a servo voltage of 11.1 volts is supplied. Of course, receiver and servos directly connected to the DPSI Mini ESP are supplied with regulated voltage of typically 5.5 volts .

The DPSI Mini 6 ESP corresponds in function to the DPSI Mini 5 ESP with just one tiny difference, here up to 7 servos resulting from 6 receiver channels can be connected directly to the DPSI Mini.

Increased power dissipation, caused by the higher input voltage of the DPSI Mini ESP systems when using 3-cells LiPo batteries, is compensated by a generous dimensioned heat sink.

The DPSI HV Mini 5 is a special version for high voltage driven servos. Here, all servos connected to a DPSI are supplied with the unregulated battery voltage (e.g. 7.4 volts from a 2-cell LiPo battery). 8 servos result from 5 receiver channels this way (e.g. 2 x ailerons per side, 2 x rudders and 1 elevator per side each). All other servos connected directly to the receiver are supplied by a regulated voltage (selectable from 5.0 up to 5.9 volts). These are e.g. throttle- and choke-servo, landing gears, valves etc. The DPSI HV Mini 5 therefore is best applicable even for servos with a nominal voltage of 7.4 volts.



Characteristics of the DPSI RV family:

  • Dual power supply with controlled voltage for receivers AND servos
  • Output voltage adjustable in 4 stages from 5.0 volts to 5.9 volts (per jumper)
  • Compliance with all manufacturer specifications for RC receiving stations
  • Continually constant servo controlling torque from constant power supply
  • Lilon / LiPoly / LongGo batteries can be used
  • 5, 6 and 7-cell NiCd / NiMH batteries can be used
  • Only 0.3 volts loss of voltage (Drop Out)
  • Electronic, fail-safe on/off switch with additional connection option for external LED voltage displays
  • Short circuit-proof servo pulse amplification in power-saving APP technology (Advanced Push Pull)
  • HFIB (High Frequency Interference Blocking), blocking of injected high frequency interference from long servo-cables (separate for each servo)
  • Having a maximum load of up to 56 amps peak current
  • 12 receiver channels with current distribution to 32 servo-connections for the DPSI RV
  • 5 receiver channels with current distribution to 8 servo-connections for the DPSI RV Mini 5
  • 6 receiver channels with current distribution to 7 servo-connections for the DPSI RV Mini 6
  • Extra Servo Power (full battery voltage output for DPSI Mini ESP systems)
  • IVM (Intelligent Voltage Monitoring) – intelligent voltage monitoring with acoustic status indicator for four different types of batteries (programmable)
  • Cable-free system, i.e. all inlets are pluggable and are therefore replaceable at any time
  • Trouble-free operation from two receivers possible
  • Special grounding concept for trouble-free operation and maximum safety
  • High-quality plastic housing with integrated holding clamps for the battery connector plugs
  • Large-surface cooling elements for deflecting heat loss
  • Each system 100% inspected and provided with a unique serial number
  • Recommended by the best pilots in the world
  • Registered design protection
  • Developed and produced by the market leader of double power supply of this type (Made in Germany)

More information about the DPSI RV family:
  • Several versions of the DPSI RV are available to cover all categories of model flight:

     System Receiver Channels Servo Connections Weight
     DPSI RV 12 32 7.4 oz
     DPSI RV Mini 5 5 8* 3.7 oz
     DPSI RV Mini 6 6 7* 3.7 oz
     DPSI RV Mini 5 ESP 5 8* 5.0 oz
     DPSI RV Mini 6 ESP 6 7* 5.0 oz
     DPSI TWIN** 2 x 8 (+ 2 x Failsafe) 25 7.5 oz

    *Other servos are plugged directly to the receiver.
    **For more information on the DPSI TWIN, please select DPSI TWIN on the left menu bar.

  • By using LongGo batteries in connection with the DPSI RV systems, outstanding total weights can be achieved. The system weights for complete power supply systems (consisting of LongGo batteries with charging cable, DPSI RV and switch transmitter) are as follows:

     System DPSI RV Capacity Weight
     With 2 x LongGo 1500 3.0 amps/h 13.55 oz
     With 2 x LongGo 2000 4.2 amps/h 16.50 oz
     With 2 x LongGo 3300 6.6 amps/h 19.60 oz
         
     System DPSI RV Mini Capacity Weight
     With 2 x LongGo 1000 2.0 amps/h   8.60 oz
     With 2 x LongGo 1500 3.0 amps/h   9.80 oz
     With 2 x LongGo 2000 4.2 amps/h 12.75 oz
     With 2 x LongGo 3300 6.6 amps/h 15.90 oz

    As a comparison: a 5-cell Sanyo RC-2400 battery alone weights about 11.4 oz (325grams)!
  • In general, we recommend an output voltage of 5.5V for operating the RC system. The semi-conductors installed in the electronics are generally designed for this maximum voltage and can tolerate 5.5 volts without accelerated aging. The controlling torque of the servos changes insignificantly from 5.5 volts to 6.0 volts. Important is the stable voltage at the servos, which does not break down even at full load. This is a given in the DPSI RV systems.

  • The linear longitudinal regulators, which are used to regulate voltage, result in losses that are transformed into heat. Regulation functions like a "valve". A high voltage enters in the front (e.g. 7.4 volts), while a regulated, lower voltage comes out from the back (e.g. 5.5 volts). The difference between the high input and the low output voltage (in this case 1.9 volts) must of course go "somewhere" (in the case of a valve, through the overflow). In the case of voltage regulation, this difference is transformed into heat. That is why the DPSI RV systems have cooling surfaces with generous dimensions, which become warm in the case of a very high load. Simply using switch-mode voltage regulation (such as with a battery charger), will allow a smaller cooling surface. A switch converter (switch-mode regulation) is very expensive, however, and for the required maximum currents (up to 50 amps) would result in considerably higher weight, considerably higher costs and an increased HF interference potential (for this reason, there are huge ferrite rings on the battery supply lines of high-quality battery chargers). Switch-mode regulation for RC power supplies of this magnitude is therefore ruled out.

  • The power electronics in the DPSI RV is designed very intricately to ensure the greatest possible safety. That is why up to 10 (!) high-performance semi-conductors are used. The complete circuit has a dual design:. double electronic switch with self-locking function, two double decoupling diodes and double voltage regulation each with two high performance semi-conductors. This redundancy prevents the interruption of power supply in the event of a particular component failure. For this reason, the DPSI RV is also used for power supply in reconnaissance missiles and drones. Using this type of intricate and high-quality electronics is naturally not cheap; but despite this, the price-performance ratio of the DPSI products is still evident.

     System
    Number of power semi-conductors
     DPSI RV
    10
     DPSI RV Mini 5 / 6
    6
     DPSI TWIN
    10
     DPSI LR
    2
  • The intricate switching technology guarantees a no-signal current consumption in switched-off position, which does not discharge the batteries. This quiescent current amounts to less than 1µamp (one receiver consumes approx. 60,000 times more power)! This ensures that no damage can occur to the batteries from a "creeping" discharge. This is achieved, in part, because the switching procedure is not controlled by the micro-controller and the micro-controller is therefore completely shut down in the switched-off status (i.e. not running in standby mode, which increases the quiescent current). The failure or unintentional reset of the micro-controller will also not cause the DPSI RV to be switched off.


The design of the entire DPSI RV systems (regarding size and weight) was based on intricate measurements. A 9 feet (3m) test model with 15 digital servos and a self-developed data logger were used for the design. The current consumption of the entire receiver station was recorded and evaluated in millisecond resolution during several videotaped measuring flights. An unique current consumption could thus be assigned to each maneuver and the median power of a complete flight could be calculated. For the first time, the actual maximum power occurring could also be determined from these measurements. A 100% reserve was calculated into the data that was acquired in this way and the required cooling capacity (for LongGo batteries) and thus the size of the DPSI RV systems determined from the results (also in relation to the maximum number of servos). The recorded data was fed into an electronic "flight simulator". Using intricate laboratory equipment, real flights of each model with any desired number of servos can be simulated by means of nominal value scaling. The algorithm that rates the battery voltages, among other things, is based on these results. Even if the expense appears to be high: real facts can only be produced from real measurements, which are then incorporated into development and ensure product quality.
   
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