Low-voltage controller with dimming function and method
A low-voltage controller (LVC) is configured to utilize a low-voltage signal to operate a high-voltage load, such as, for example, a lamp. The LVC is configured to receive a low-voltage step signal at a switch input. The LVC has a line input for connection to a source of power at a line voltage and a load output for connection to a first load, and a dimmer for setting an intensity of the first load. Subsequent step signals may alter the intensity of the load. A method for low-voltage control of a load is provided. A method includes the steps of receiving a first switch signal at a switch input of an LVC; setting a lamp to a first intensity; receiving a second switch signal at the switch input; and setting the lamp to a second intensity.
1. A low-voltage controller, comprising:
a switch input configured to receive a low-voltage step signal;
a line input configured to connect to a line voltage source;
a first load output configured to connect to a first load and provide power to the first load;
a dimmer configured to set a first intensity of the first load when a first occurrence of the low-voltage step signal is received at the switch input, and a second intensity of the first load when a second occurrence of the low-voltage step signal is received at the switch input; and
an isolator coupled between the first load output and the dimmer to galvanically isolate the first load output.
2. The low-voltage controller of claim 1 , wherein the dimmer further comprises a microcontroller programmed to increment a switch counter upon receipt of the low-voltage step signal at the switch input and set the intensity at the first load output according to a value of the switch counter.
3. The low-voltage controller of claim 1 , wherein the isolator comprises a galvanic transformer.
4. The low-voltage controller of claim 1 , wherein the isolator comprises a switched-mode power supply.
5. A low-voltage controller, comprising:
a switch input configured to receive a low-voltage step signal;
a line input configured to connect to a line voltage source;
a first load output configured to connect to a first load and provide power to the first load; and
a microcontroller having two or more outputs, wherein the microcontroller is configured to turn on a first output when a first occurrence of the low-voltage step signal is received at the switch input, and to turn on a second output when a second occurrence of the low-voltage step signal is received at the switch input;
a summing amplifier, comprising:
two or more inputs electrically connected to the two or more outputs of the microcontroller; and
an amplifier output configured to provide an analog signal to the first load output based on a sum of the two or more inputs.
6. The low-voltage controller of claim 5 , wherein the microcontroller comprises four outputs and each output is set in turn upon subsequent occurrences of the low-voltage step signal.
7. The low-voltage controller of claim 5 , further comprising an isolation stage coupled between the first load output and the summing amplifier to galvanically isolate the first load output.
8. The low-voltage controller of claim 7 , wherein the isolation stage comprises a galvanic transformer.
9. The low-voltage controller of claim 7 , wherein the isolation stage comprises a switched-mode power supply.
10. A low-voltage controller, comprising:
a switch input configured to receive a low-voltage step signal;
a wireless transmitter configured to communicate with a corresponding wireless receiver of a first load; and
a dimmer configured to wirelessly transmit a first intensity signal to the first load when a first occurrence of the low-voltage step signal is received at the switch input, and to wirelessly transmit a second intensity signal to the first load when a second occurrence of the low-voltage step signal is received at the switch input.
11. The low voltage controller of claim 10 , wherein the first intensity signal and the second intensity signal comprise one or more packets formatted according to a protocol.
12. The low-voltage controller of claim 11 , wherein the protocol is 0-10 V, ACN, ASCII, BACnet, DALI, DMX512, EnOcean, Konnex, LonWorks, MIDI, Modbus, RDM, SMPTE®, TCP/IP, an XML, Zigbee®, or ZWave®.
13. A low-voltage controller, comprising:
a switch input configured to receive a low-voltage step signal;
a line input configured to connect to a line voltage source; and
a first load output configured to connect to a first load and provide power to the first load;
a dimmer configured to set a first intensity of the first load when a first occurrence of the low-voltage step signal is received at the switch input for a first time interval, and a second intensity of the first load when a second occurrence of the low-voltage step signal is received at the switch input for a second time interval,
wherein the dimmer comprises a microcontroller programmed to continuously increment a switch counter during the first time interval and set the first intensity at the first load output according to a value of the switch counter.
14. The low-voltage controller of claim 13 , further comprising an isolation stage coupled between the first load output and the dimmer to galvanically isolate the first load output.