ZMPT101B
ZMPT101B AC Voltage Sensor is the best for the purpose of the DIY project, where we need to measure the accurate AC voltage with the voltage transformer. This is an ideal choice to measure the AC voltage using Arduino/ESP8266/Raspberry Pi like an open source platform. In many electrical projects, engineer directly deals with measurements with few basic requirements like.
- High galvanic isolation
- Wide Range
- High accuracy
- Good Consistency
ZMPT 101B is a high-precision voltage Transformer. This module makes it easy to monitor AC mains voltage up to 1000 volts. If you want smaller version of this module check ZMPT107.
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Applications of Small Size Voltage transformer
- Metering (electrical energy meters)
- AC Voltage measurement
- Sensing Overload Current
- Ground fault detection
- Household electrical equipment
- Industrial apparatuses
- Electrical testing equipment and relay protection
Features of ZMPT 101B Micro Precision Voltage Transformers
- low price
- Small size (49.5mm x 19.4mm) and lightweight
- Easy PCB mounting
- Good consistency
- widely acclaimed
Know More About micro Voltage Transformer ZMPT101B
ZMPT101B is a high-precision voltage Transformer. This module makes it easy to monitor AC mains voltage up to 1000 volts. A tiny little thing the size of a bouillon cube. Holds up to 4kV per breakdown voltage, the ratio of turns is 1: 1, but this is a current transformer of 2mA: 2mA. We feed it a current and remove the current. The input current is simply set by the resistor in series R1, and we use a sampling resistor R2 in parallel to get the output voltage.
ZMPT101B schematic Diagram
Now we get 5 volts, but here an ambush. This voltage is varied from -5 to +5. And we need measurements of 0 … 5 volts. What to do? Straighten.
See in next section.
Note: we use this same calculation for
AC Power Measurement Using Arduino project, where we use ZMPT107 | Best Low Cost AC Voltage Transformer
ZMPT 101B Transformer Calculation
R1 is chosen so that the current through the winding does not exceed 2mA, it holds a maximum of 10mA, but after 2mA linearity is lost and the output will be clear that.
Step 1: Determination of maximum output RMS voltage
VOutmax is decided by the ADC peak voltage in the sampling loop of Microcontroller.
For Bipolar ADC
VOutmax=(Peak Voltage)/(√2)
For example
As for ± 5V ADC, the maximum RMS voltage of the transformer:
VOutmax=(Peak Voltage)/(√2)=5V/(√2)=3.53V
For Unipolar ADC
VOutmax=(Peak Voltage)/(2√2)
For example
As for 0-3.3V ADC, the maximum RMS voltage of the transformer:
VOutmax=(Peak Voltage)/(2√2)=3.3V/(2√2)=1.16V
Step 2: Determination of input current-limiting resistor R1
Current-limiting resistor
R1=Vin/I
Where
Vin : Rated input voltage
I ： Rated operating current （ when Coil resistance is compared with current-limiting resistor R1, it can be ignored.）
ZMPT101B usually working at rated current: 1~2mA.
When Rated input voltage ≤ 100V ，Usually choosing the operating current I=2mA; When Rated input voltage ≥ 220V，To reducing the resistor power， usually choosing the operating current 1 mA ≤ I ≤ 2 mA.
for example V=100V，I=2 mA，
R1=Vin/I=100/0.002=50kΩ
for example: V=220V，I=1.1 mA，
R1=Vin/I=220/0.0011=200kΩ
To improve reliability, the current-limiting resistor selected usually is greater than its 4 times the rated power, and generally, uses a high temperature coefficient metal film resistor.
Step 3: Determination of the sampling resistor R2
R2=VOutmax/I=(VOutmax/Vin)×R1 Ω
for example: Voutmax =3.53V，Vin =100V
R2=VOutmax/I=(VOutmax/Vin)×R1=(3.53/100)×50 kΩ=1.765kΩ
The above formula is also suitable for the two ways of active and passive output.
When selecting the sampling resistor, Resistor should not exceed
R2=VOutmax/I=VOutmax/Vin×R1 Ω
Download links
Interface ZMPT 101 B Module to Arduino
For Diy Electronic measuring AC Output Voltage using Arduino is easy now.
ZMPT101B is a Single Phase Voltage Transformer Module which allows you to directly measure 0-250V AC sine wave using Arduino.
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Feature of ZMPT101B Module
- Voltage Transformer: Onboard Precision Micro Voltage Transformer
- Operational amplifier circuit: high-precision on-board amplifier circuit, the signal to do the exact sampling and appropriate compensation.
- Input/Output: the module can measure AC voltage within 250V, the corresponding output voltage amplitude can be adjusted by using a potentiometer( Multi-turn trim pot).
- Output signal: the output signal for the sine wave, the waveform of the median (DC component(offset of 2.5V at 5V input supply)
- Supply voltage: 5V
- Operating temperature: 40ºC ~ + 70ºC
