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RoboSavvy HotSwap PowerBoard 1.0

Availability: Out of stock



Quick overview

In many robotic applications it is a requirement to provide continuous power supply without having to reset the system when changing batteries or when switching between DC power supply and battery source. RoboSavvy HotSwap Power Board 1.0 is designed to provide continuous power to a robot allowing the interchangeable use of two DC power sources

Mobile Robots require continuous DC power supply to ensure the computers and motors continue to work when swapping batteries or when switching from DC to battery operation or when using an unreliable DC power supply backed up by battery. RoboSavvy HotSwap Power Board (PowerBoard 1.0) is designed to provide up to 25A of continuous power, allowing safe hot-swapping between two interchangeable power sources.


2 Input power sources (mains DC power or battery) The board can accept any combination of two power sources. They can be of different voltage within the 2.9V-18V range.
2.9V to 18V Operating Range Good for up to 4 cell LiPo
Emergency power cutoff when power source reaches low battery voltage Protect you LiPo battery from critical low voltage
Voltage spike protection The Board turns off when reaching voltage above 18V
Input Voltage Inversion protection Protects the board and system from accidental reversed polarity input voltage
Protection from from applying erronous external voltage on output rail Protects the board from application of high voltage or reverse polarity voltage on the Output rail
Current spike cuttoff The board will shut off the output voltage when sensing a current spike. Limits Peak Fault Current in ≤1μs
Inrush current control Protects against initial current spike surge
Protects Output Voltage from Input Brownouts and oscilations Ensures limited voltage drop when switching input voltage source
Status LEDs and monitoring pins LEDS indicated current input channel source and fault. This status is available as pins to external CPU for monitoring.
Pins allow enable/disable of each input source User/CPU can select which input voltage is available

Terminal Options

The board comes in three possible configurations:

RoboPower 1.0 wihtout terminals
Wihtout terminals - user can solder the wires directly to the rails.
PowerBoard 1.0 with XT60 Terminals
Pre-soldered with XT60 connectors (popular hoby RC LiPo battery connector)
PowerBoard 1.0 with 31701102 terminals
Pre-soldered with 31701102 connectors (user can screw on the wires to the board)


Number of input power sources 2
Input Voltage range (V) 2.9V-18V
Number of output power rails 1
Rail maximum continuous current 25A
Rail maximum spike (peak) current 50A for 0.12ms
Indicator LEDs 4
Enable/disable power sources One for each input
Quick response on hotswap 15ms
Inrush current limit prevent sparks
Overcurrent protection Allow 25A-50A for 120μs
Overvoltage protection 20V
Measurements 88mm x 68mm
Input1, Input2 Input voltage Channlel 1,2 (2.9V-18V) 2.9V-18V
Output Output rail will route any or none of the Input voltages. There are several types of connectors and locations that the user can choose to solder the output 2.9V-18V
EN1, EN2 Enable Input1, Input2 by grounding JP1,2. The JP1,2 pins produce 1.235V and will source 10μA. Any voltage above 1.235V applied to JP1,2 will disable the Input. Any voltage 1.235V or lower will enable the Input. 10μA
PWRGD1,2 "Power Good" indicates which of Input1 and Input2 is currently sourced 5V=on, 0V=off
LED1,2 Which Input is currently sourced (PWRGD status). LED1=Input1, LED2=Input2 Green
LED 3,4 Fault Indicators - neither Input1 nor Input2 are routed to the Output until the board is reset. LED3=Fault caused by Input1, LED4=Fault caused by Input2. Types of fault: (a) short-circuit in the output (b) current limit reached (c) low voltage threshold reached on both Input1, 2 Red
D1, D2 TVS Diode protects against Input overvoltage and voltage inversion (Reverse Polarity) on Input1 and Input2. User replaceable. SMLJ17A
D3 Same as D1,D2 but protecting the board and target system from overvoltage and reverse polarity on the Output rail. Also protects from electrostatic discharge (EDS) SMLJ17A
Hotswap IC The main chip in charge of the hotswap logic LTC4228-1
MOSFETs Rated for 20V, 100A AUIRFS8409-7P

Current Limit Thresholds

The board has two current limiting features. When the board is initially powered, the Inrush Control feature kicks in and prevents from current spikes and sparks from occuring. When the board is working continously, the current is limited to 25A. The Output will be cut off if the current spikes between over 25A and 50A for a period exceeding 120μs. Once the Output is switched off, the board goes into Fault mode (indicated by LED3,4) and needs to be reset. If the current spikes to more than 50A during the 120μs period, it may overheat and damage the MOSFETs.

Feature Description
Inrush current control Limits maximum current output linearly when board is initially powered. The timing depends on input Voltage at 0.2V per millisecond. For example, 10V Input will limit current uptake during 50ms. 20V Input will limit the current uptake during 100ms.
I > 25A, t=0 If current exceeds 25A, the clock starts ticking..
50A > I > 25A, t < 120μs The current is allowed to continue its surge between 25A and 50A for up to 120μs
I > 50A, t < 120μs Fault Condition is triggered if the current goes beyond 50A
50A > I > 25A, t > 120μs Fault Condition is triggered if the current stays above 25A for more than 120μs

Overvoltage and Reverse Polarity protection

Both Input rails and the Output rail have a Transient-Voltage-Suppression (TVS) Zener diode soldered between the + and - rails (D1,D2,D3). The diode will assume all the flowing current should the voltage exceed the rated 18V-24V or should an inverted voltage be applied. Should these fault conditions happen, the board and system will be saved but the diode may be damaged as heat accumulates through prolonged exposure to the current.

Hot-Swap Voltage Threshold

Rotate the potentiometer V1_MIN to the minimum voltage value of Input1 (the priority channel). If the input voltage on Input1 is above the set value, then the Output will be taken from Input1. If the voltage on Input1 goes below the set value, the Output will be connected to INPUT2. When the Input1 voltage is then again higher then V1_MIN, the voltage source will swap again. When the board has hot-swapped to Input2, no checks are done on Input2 voltage level. If Input2 is a LiPo battery, please use a "LiPo saver"/"battery monitor" to prevent it from reaching critical low voltage

Input Output
Input1 > V1_MIN Input1
Input1 < V1_MIN Input2
Input1 < V1_MIN, Input2 < V1_MIN Does not create a fault condition

Hot-Swap Voltage Transition

In the following two diagrams we tested the board with incandescent light bulbs, a 4-cell LiPo battery and DC power. The DC power was in Input1 and when it disconnected, the voltage resumed taking the LiPo in Input2 as source. When the light bulbs consumed 10A, the transition took 15ms and the lowest voltage resitered was 3V. When the light bulbs consumed 20A, the transition took 7ms and the lowest voltage resitered was 1.8V. Our test represents the "worst case" scenario since incandescent light-bulbs have negligeable inductance. When the target circuit has capacitance, the transition voltage drop is hardly noticeable.

Transition between DC and LiPo 10A
Transition between PSU (13.8V) and 4S LiPo (15V) – LOAD=10A Vmin=3V (5ms scale)
Transition DC LiPo 20A
Transition between PSU (13.8V) and 4S LiPo (15V) – LOAD=20A Vmin=1.8V (10ms scale)


PowerBoard 1.0 Dimensions

Manufacturer part No: RSV-POWERBOARD1