The Simple-H from Robot Power is a low-cost robust H-bridge circuit designed for use driving DC motors or other DC loads in the ~25A and 6V-28V range. The Simple-H can be controlled by a wide range of command sources from switches to 555 timer circuits to microcontrollers such as BasicStamps and Arduinos. The classic "green" Simple-H requires 3V-5V logic level signals on its command inputs.
The Simple-H does not have on-board logic to interpret R/C, serial, analog voltage or other commands. An external signal source is required to translate command inputs into the switching signals needed to drive the Simple-H power chips. This flexibility allows the Simple-H to be driven from a signal source as simple as a pushbutton or as complex as a microcontroller or BasicStamp. Even a desktop or laptop PC can be used through a parallel port or USB port expander.
Unlike many competing products which advertise similar current ratings, the Simple-H ratings are for a period measured in minutes or hours not a few seconds or less. With a Simple-H you can be sure if you need 20A of current you can get 20A out of it for as long as you need it.
The Simple-H has the following specifications and features:
|Supply voltage||5V to 28V (24V max battery rating)|
|Output Current (continuous)||20A (25A with fan)|
|Output Current (surge)||>45A|
|Power chips||2 ea. BTS7960B|
|On Resistance||.016 ohm max at 25C|
|PWM Frequency||DC to 20kHz|
|Cooling||Heatsinks and optional 20 CFM 50mm fan|
|Logic Interface||3V - 5V classic version|
4V-28V HV version
min. 2 digital signals required to drive
|Current and Temp Limiting||Built in to power chips|
|Current Sense Outputs||0.0745V per Amp - 2.98V at 40A|
|Connectors||8-pos 0.1" screw terminal, 2-pos fan terminal|
4 each screw terminals for power wires
The Simple-H uses a heatsink and heavy copper areas on the circuit board to dissipate heat. This results in a current rating higher than for most motor drives of similar size. To get the maximum possible current or to run for extended periods close to maximum, the Simple-H uses an optional cooling fan to further dissipate heat. The fan itself is a commonly available 12V 50mm square computer cooling fan. Mounting holes are provided at the correct spacing to mount the fan directly over the power chips for maximum cooling efficiency.
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