Signal Consulting, LLC  Model Si30HFHB-50V-30A-ALC

50V-30A High-Frequency H-Bridge, DC to 20kHZ PWM, with Active-Low Control, Integrated Finned Heat-Sink, for Bidirectional DC Motor Driver

Si30HFHB-50V-30A-ALC Features: Power Semiconductors: Eight 90A MOSFETs Max. Continuous Current: 30A with Heat-Sink (as shown). Max. Current for 5 sec: 50A with Heat-Sink ( as shown ). Load Isolation: The Load must be Isolated from the  Power Source. Control Type: Active Low.                                        Load-Voltage Indicator: Bicolor LED. Worst-Case Control Latency: 7 micro seconds. Power-Conversion Efficiency: Approx. 98.5% (at 50V, 30A). Overall Dimensions : 4.6”x2.43”x2.35”, (117 x 62 x 60 mm). Components Type: 100% Solid State, NO Relays On Board:  Filter Capacitors VTS diodes Snubber Circuit included Voltage Requirements: A single DC Source (unregulated), any voltage from 12V to 50 Volts   Si30HFHB-50V-30A-ALC  Spec Sheet  (PDF)

The Si30HFHB-50V-30A-ALC is a 50V 30A, microprocessor based, high-power, High-Frequency H-Bridge with active-low control inputs. This board uses a single (12V to 50V at 30A) DC power supply to control the speed of a DC motor (or load current) in forward or reverse direction. An onboard microprocessor samples the control inputs at 150kHz rate and generates the timing signals for the H-Bridge. The high sampling rate provides a worst-case control latency of 7uS when the bridge is changing current direction or switching on or off. Two active low digital (0 to +5V) control signals (V_F,G  and V_R,G) or switches are used to select the direction of rotation (or Load-Current Direction). These inputs can be Pulse Width Modulated (PWM) from DC to 20kHz carrier rate. A bicolor LED is used to monitor the motor (or load) voltage (Red = Forward, Green = Reverse). A small (4.6”x2.4”x1.0”) integrated finned heat-sink is used to operate the bridge at 30A (continuous) current levels. Higher current-levels (40A) can be achieved with more efficient heat-sinks. Please click on this link and read the Board Mounting Instructions and Heat Sink Selection Guide. This board operates in a wide voltage-range (12V to 50V) at a maximum continuous load-current of 30A. Typical applications are: Bi-directional DC Motor-Speed Controller, Peltier Effect TE Coolers, Heat Pumps, DPDT Solid State Relay, etc. This board can be configured and programmed to perform efficiently in many customized applications.            

ALC Control Truth Table (on connector CN4)

·         The control lines F and R (V_F,G , V_R,G) can be Pulse-Width Modulated (PWM in a range of 0-20k Hz) to vary the average current supplied to a load or to a DC Motor.

·         Typical Input Resistance of I1 and I2 is 4.7kOhm, relative to pin +5V

 The motor action or load-current direction is controlled by active low control inputs, (0 to +5V); applied to Pin F (Forward) and/or pin R (Reverse) relative to Pin N (Neutral) on the Connector CN4. These control signals are optically isolated from the high-side of the H-Bridge, providing good noise immunity. The control actions and the required voltage and current levels are listed in the Truth-Table (given above). 

Frequency Response of the Si30HFHB-50V-30A-ALC

This plot shows the maximum average load current as a function of PWM carrier frequency (in Hz) at 100% duty-cycle.

A Typical Motor Control Application of the Si30HFHB-50V-30A-ALC

 In this open-loop application, the motor direction is controlled by 2 external normally-open switches connected to pins F (forward) and R (reverse) on port CN4 (as shown below).

Warning:  The connecting wires to the Load and the Power Supply must be heavy gauge copper wire (#12 AWG or heavier) to handle the rated current level. In addition, these heavy gauge wires act as a heat sink, protecting the board from overheating. Note that each connecting point on CN1 is available at 2 places, thus two smaller wires can be used in place of a larger one.

Availability: We usually ship in 2-3 business days.

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