Providing a motor interface compatible with multiple motor types

1. A motor control interface circuit comprising:

a first solid-state switching device controllable with an input signal to switch a DC voltage from a DC voltage source to provide a signal; and

a normalizing circuit provided between the DC voltage source and a tap of a motor, the normalizing circuit comprising:

a clamping device configured to limit a voltage of the signal to an interface voltage level predefined for driving a plurality of motor types including the motor; and

a second solid-state switching device between the DC voltage source and the clamping device, the first solid-state switching device controllable to switch the second solid-state switching device on and/or off with the DC voltage;

wherein the normalizing circuit is configured to:

divide current resulting from the switched DC voltage between the first and the second solid-state switching device;

direct a first portion of the divided current passing through a collector and an emitter of the first solid-state switching device to a ground; and

direct a second portion of the divided current passing through an emitter and collector of the second solid-state switching device towards the clamping device.

2. The motor control interface circuit of claim 1 , wherein the normalizing circuit further comprises one or more resistances between the second solid-state switching device and the clamping device.

3. The motor control interface circuit of claim 1 , wherein the second solid-state switching device comprises a PNP transistor having a base connected between the DC voltage source and the first solid-state switching device.

4. The motor control interface circuit of claim 3 , wherein the normalizing circuit further comprises resistances between the DC voltage source and a collector of the first solid-state switching device, the PNP transistor base being connected between the resistances.

5. The motor control interface circuit of claim 1 , wherein the first solid-state switching device is configured to pass current to a ground, and the clamping device comprises a Zener diode configured to pass current to the ground.

6. The motor control interface circuit of claim 1 , wherein the first solid-state switching device comprises a NPN transistor having a base through which the NPN transistor is controllable to switch the DC voltage.

7. A motor control interface circuit comprising:

a first transistor controllable with an input signal to switch a DC voltage from a DC voltage source to provide a signal; and

a normalizing circuit provided between the DC voltage source and a tap of a motor, the normalizing circuit having a second transistor between the DC voltage source and a clamping device, the first transistor controllable to switch the second transistor on and/or off with the DC voltage;

wherein the clamping device is configured to limit a voltage of the signal to an interface voltage level predefined for driving a plurality of motor types including the motor;

wherein the normalizing circuit is configured to:

divide current resulting from the switched DC voltage between the first transistor and the second transistor;

direct a first portion of the divided current passing through a collector and emitter of the first transistor to a ground; and

direct a second portion of the divided current passing through an emitter and collector of the second transistor towards the clamping device.

8. The motor control interface circuit of claim 7 , wherein the clamping device comprises a Zener diode.

9. The motor control interface circuit of claim 8 , wherein the normalizing circuit further comprises at least one resistance connected in series with a collector of the second transistor and a cathode of the Zener diode.

10. A motor control interface circuit assembly comprising the motor control interface circuit of claim 7 .

11. The motor control interface circuit of claim 7 , wherein the plurality of motor types comprise ECMs.

12. A method of driving a motor, the method comprising the steps of:

switching a DC voltage from a DC voltage source to provide a control signal, the switching performed by an HVAC control device using a first solid-state switching device of a motor control interface circuit;

normalizing the control signal to a voltage level predefined for driving a plurality of motor types including the motor, the normalizing performed by a normalizing circuit of the motor control interface circuit; and

providing the normalized control signal at a tap of the motor;

wherein normalizing the control signal comprises:

dividing current resulting from the switched DC voltage between the first and a second solid-state switching device;

directing a first portion of the divided current passing through a collector and emitter of the first solid-state switching device to a ground; and

directing a second portion of the divided current passing through an emitter and collector of the second solid-state switching device towards a clamping device connected with the tap of the motor;

whereby the clamping device passes current to the ground to limit the voltage of the control signal to the tap of the motor.

13. The method of claim 12 , wherein the clamping device includes a Zener diode, the first solid-state switching device includes a NPN transistor, and the second solid-state switching device includes a PNP transistor.

14. The method of claim 12 , wherein the normalized control signal at the tap of the motor is configured by the HVAC control device for delivery to another tap of the motor.

15. The method of claim 14 , wherein the motor has five taps, and wherein the method is performed as to the motor having five taps.

16. The method of claim 12 , performed via a plurality of motor control interface circuits each connected with a corresponding tap of the motor.

17. The method of claim 16 , wherein the motor has five taps, and wherein the method is performed as to the motor having five taps.