Differential pair circuit for EMI noise mitigation with UV technology
The disclosure relates to technology for a UV sanitization system that has an excimer ultraviolet (UV) lamp. The excimer UV lamp is configured to emit UV light into an environment in which the UV sanitization system is present. The UV sanitization system may have one or more sensors, which may be able to sense within the environment. The UV sanitization system uses differential pair communication to mitigate EMI that results from operation of the excimer UV lamp. The differential pair circuitry may include a differential communication link and fully differential operational amplifiers to process differential signals transferred over the differential communication link.
1 . An apparatus comprising:
differential communication circuitry comprising:
a differential communication link having a first end and a second end, the differential communication link having a first electrical line and a second electrical line;
a fully differential operational amplifier having a differential input connected to the first electrical line and the second electrical line at the first end of the differential communication link; and
a differential bus driver connected to the first electrical line and the second electrical line at the second end of the differential communication link, the differential bus driver configured to drive a differential signal onto the differential communication link;
a control circuit in communication with a differential output the fully differential operational amplifier;
a sensor in communication with the differential bus driver, wherein the control circuit is configured to communicate with the sensor with the differential signal using the differential communication circuitry; and
an excimer ultraviolet (UV) lamp coupled to the control circuit, the control circuit configured to control operation of the excimer UV lamp to cause the excimer UV lamp to emit UV electromagnetic radiation while the control circuit is communicating with the sensor with the differential signal using the differential communication circuitry.
2 . The apparatus of claim 1 , further comprising:
a power inverter configured to convert a DC voltage to a voltage signal having a voltage and a frequency suitable to cause the excimer UV lamp to generate the UV electromagnetic radiation by excimer emission, wherein the power inverter is coupled to the excimer UV lamp to provide the voltage signal over a third electrical line and a fourth electrical line to the excimer UV lamp.
3 . The apparatus of claim 1 , further comprising:
an AC to DC converter configured to receive an AC voltage over a power line, a neutral line, and a ground line, the AC to DC converter configured to convert the AC voltage over the power line and the neutral line to a DC voltage, wherein the control circuit, the sensor, and the fully differential operational amplifier are configured to operate based on DC voltages derived from the DC voltage from the AC to DC converter; and
a faraday cage positioned around the excimer UV lamp, wherein the faraday cage is connected to the ground line.
4 . The apparatus of claim 3 , further comprising:
a power inverter configured to receive the DC voltage and convert the DC voltage to a voltage signal having a voltage and a frequency suitable to cause the excimer UV lamp to generate the UV electromagnetic radiation by excimer emission, wherein the power inverter is coupled to the excimer UV lamp to provide the voltage signal over a third electrical line and a fourth electrical line to the excimer UV lamp.
5 . The apparatus of claim 4 , further comprising:
a printed circuit board having a DC power input having a DC power terminal and a DC common terminal, the DC power terminal and the DC common terminal configured to receive a DC voltage derived from the DC voltage from the AC to DC converter, the excimer UV lamp mounted on the printed circuit board, the excimer UV lamp having a high voltage terminal connected to the third electrical line and a low voltage terminal connected to the fourth electrical line.
6 . The apparatus of claim 1 , wherein the first electrical line and the second electrical line of the differential communication link are configured as a twisted pair.
7 . The apparatus of claim 1 , wherein the fully differential operational amplifier is a first fully differential operational amplifier having a first differential input connected to the first electrical line and the second electrical line at the first end of the differential communication link to process a first differential signal while the excimer UV lamp emits the UV electromagnetic radiation, and wherein the differential communication circuitry further comprises:
a second fully differential operational amplifier having a second differential input connected to the first electrical line and the second electrical line at the second end of the differential communication link to process a second differential signal while the excimer UV lamp emits the UV electromagnetic radiation.
8 . The apparatus of claim 1 , wherein the fully differential operational amplifier is a first fully differential operational amplifier and the differential bus driver comprises:
a second fully differential operational amplifier having a differential input connected to the first electrical line and the second electrical line at the second end of the differential communication link to drive the differential signal onto the differential communication link.
9 . The apparatus of claim 1 , wherein the excimer UV lamp is configured to output far UVC light while the control circuit is communicating with the sensor using the differential signal over the differential communication link.
10 . The apparatus of claim 1 , further comprising a housing configured to house the differential communication link, the fully differential operational amplifier, and the control circuit, the housing configured to hold the excimer UV lamp to allow the excimer UV lamp to emit the UV electromagnetic radiation into an environment in which the housing resides, the housing configured to hold the sensor to allow the sensor to sense within the environment in which the housing resides while the excimer UV lamp is emitting the UV electromagnetic radiation into the environment by excimer emission.
11 . The apparatus of claim 10 , wherein the control circuit communicating with the sensor using the differential signal over the differential communication link includes transferring data about the environment from the sensor to the control circuit while the excimer UV lamp emits the UV electromagnetic radiation into the environment.
12 . The apparatus of claim 11 , wherein the control circuit is further configured to report the data about the environment to a client electronic device.
13 . An ultraviolet (UV) sanitization system, the UV sanitization system comprising:
differential communication circuitry having a differential communication link comprising a twisted pair of a first electrical line and a second electrical line, a first fully differential operational amplifier having a first differential input coupled to a first end of the differential communication link and a second fully differential operational amplifier having a second differential input coupled to a second end of the differential communication link;
a first printed circuit board having a control circuit, the control circuit communicatively coupled with a first differential output of the first fully differential operational amplifier;
a second printed circuit board having a sensor, the sensor communicatively coupled with a second differential output the second fully differential operational amplifier;
a third printed circuit board having a voltage inverter configured to convert a DC voltage to a voltage signal; and
an excimer ultraviolet (UV) lamp coupled to the voltage inverter to receive the voltage signal, the control circuit configured to control the voltage inverter to cause the voltage inverter to provide the voltage signal to the excimer UV lamp to cause the excimer UV lamp emit UVC electromagnetic radiation by excimer emission while the control circuit is communicating with the sensor with differential signals using the differential communication circuitry.
14 . The UV sanitization system of claim 13 , further comprising:
an AC to DC converter configured to receive an AC voltage over a power line, a neutral line, and a ground line, the AC to DC converter configured to convert the AC voltage over the power line and the neutral line to a DC voltage, wherein the control circuit, the sensor, the first fully differential operational amplifier and the second fully differential operational amplifier are configured to operate based on DC voltages derived from the DC voltage from the AC to DC converter; and
a faraday cage positioned around the excimer UV lamp, wherein the faraday cage is connected to the ground line.
15 . The UV sanitization system of claim 13 , further comprising:
a power inverter configured to receive a DC voltage and convert the DC voltage to the voltage signal, wherein the voltage signal has a voltage and a frequency suitable to cause the excimer UV lamp to generate the UVC electromagnetic radiation by excimer emission, wherein the power inverter is coupled to the excimer UV lamp to provide the voltage signal over a third electrical line and a fourth electrical line to the excimer UV lamp.
16 . The UV sanitization system of claim 13 , further comprising a housing configured to house the differential communication circuitry, the first printed circuit board, the second printed circuit board, and the third printed circuit board, wherein the housing is configured to hold the excimer UV lamp in a position to allow the excimer UV lamp to emit the UVC electromagnetic radiation into an environment in which the UV sanitization system resides, the housing configured to hold the sensor in a position to allow the sensor to sense within the environment in which the UV sanitization system resides while the excimer UV lamp emits the UVC electromagnetic radiation into the environment.