products/Si5HyUdMC1-50V

Signal Consulting, LLC

Model Si5HyUdMC1-50V-20A

Single, Open-Loop, Hybrid, Unidirectional, 50V-20A DC Motor Controller with Integrated Heat Sink and with 5kHz or 20kHz PWM, T-Chip

Si5HyUdMC1-50V-20A Features:
Power Semiconductors: Two 60A MOSFETs
Max. Continuous Load Current: 20A with Heat Sink as shown
Max. Load Current for 5sec: 60A with Heat-sink as shown
Board's Size: 2.3" x 2.4" x 1.9" (5.8cm x 6.1cm x4.9cm)
Components Type: 100% Solid State, NO Relays

A single DC Motor or Load is controlled by a Pulse Width Modulator (PWM).

PWM carrier frequency is user selectable with a jumper, 20kHz when the jumper is open and 5kHz when closed.

The Load-Voltage is adjustable from 0V to 50V in 3.3V steps ( or max. value of Vp) with an analog control signal or with an internal or external potentiometer.

User can choose between slow or fast motor acceleration/deceleration modes.

High Power-Efficiency: 97.5% typical, at 50V and 20A

On Board:
Filter Capacitors
VTS diodes
Snubber Circuit Ready
Voltage Requirement:
A single DC Source Voltage (unregulated) with any voltage value from 9V to 50V (for Vp)

Si5HyUdMC1-50V-20A Spec Sheet (PDF)

The Si5HyUdMC1-50V-20A is a 50V, 20A, microprocessor based, Single, Open-Loop, Hybrid, Unidirectional, 50V at 20A, DC Motor-Controller board with an integrated heat sink. This board uses pulse-width modulation (PWM) to efficiently control the speed of a brush type DC motor (or load current ) in the 0 to 1000W power range, with 8.33W steps. An onboard microprocessor generates a 5kHz or 20kHz PWM carrier signal, controls the load-power (or motor speed) and controls the load-current rate (or motor acceleration and deceleration). The PWM carrier frequency is user selectable by the jumper CN4, 20kHz when CN4 is open and 5kHz when short. The high frequency PWM rate provides a smooth speed control and insures a quiet motor environment. As the name hybrid (Hy) implies, the desired motor speed (or PWM pulse-duration) is set by a variable (0 to +5V) analog input-voltage V_I1,G, providing a smooth motor-speed control from 0 to 100% in 0.833% steps; while the other control-signals are digital. This analog input (V_I1,G) is zener-diode protected. The user can choose between slow or fast motor acceleration/deceleration modes by short-circuiting or open-circuiting the pins labeled J1. The slow mode, with rise-time/fall-time of 0.5s, is selected by short-circuit (J1 jumper installed); while the fast buildup mode, with rise-time/fall-time of 0.025s, is selected by leaving these pins open (no Jumper installed). All control lines (analog and digital) are sampled approximately at 700Hz rate in the fast mode, and at 20Hz rate in the slow mode. An onboard LED (red) is used to monitor the load-voltage. A small (2.3”x2.4”x0.45”) finned integrated heat sink is included with mounting hardware (as shown on the photograph) to operate at 20A or 1000W power levels. Higher power-levels (50V, 30A or 1500W) 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 requires a single 9V to 50V DC power source (unregulated and unfiltered) at a 0A to 20A current range to operate normally. Typical applications are: DC Motor-Speed Controller, Light-Dimmer with variable delay, Power Amplifier, SPST Solid State Relay, etc. This board can be configured and programmed to perform efficiently in many customized applications.

A Typical Application of the Si5HyUdMC1-50V-20A

In this application, the motor speed (or PWM pulse-duration) is linearly adjusted with the Si5Pot1-5k accessory (an external 1-turn 5kW pot); and efficiently controlling the motor power from 0 to 1000W in 8.33W steps. The DC Motor can be purchased from Bodine, www.bodine-electric.com ; or from other vendors, http://www.e-motorsonline.com/emotors/dcmproduct_list.php .

An inexpensive, unregulated DC power supply design is shown in this application drawing. This power supply consists of a transformer, a 25A bridge rectifier (purchased from www.digikey.com with part number MB256-ND) and an optional C=2200uF, 50V capacitor ( www.digikey.com part number 493-1346-ND). The secondary voltage and current rating of the transformer determines the DC voltage and current output of this power supply. Low-voltage and low-current transformers can be purchased from www.mpja.com with the following part numbers: for 33V, 10A DC output use transformer 7846-TR; for 16V, 4A DC output use transformer 7840-TR. The component cost of this low-current output power supply is under $20. A wide variety of linear and switching power supplies can also be used with this board. Consult the most recent catalog on www.mpja.com to purchase these power supplies. Warning: The connecting wires to the Motor 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.