f55711dd44163e260b3801171760c3b1c1bcc9e8
Chip-dat/Allegro-DAT/ACS712-dat/ACS712-dat.md
| ... | ... | @@ -6,7 +6,7 @@ |
| 6 | 6 | |
| 7 | 7 | - [[SVC1000-dat]] - [[SVC1002-dat]] - [[SVC1004-dat]] - [[ACS712-dat]] |
| 8 | 8 | |
| 9 | - |
|
| 9 | +- [[VRMS-dat]] - [[ACS712-dat]] |
|
| 10 | 10 | |
| 11 | 11 | |
| 12 | 12 | [legacy wiki page](https://w.electrodragon.com/w/ACS712) |
| ... | ... | @@ -32,4 +32,6 @@ with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor |
| 32 | 32 | |
| 33 | 33 | ## ref |
| 34 | 34 | |
| 35 | -- datasheet - [[ACS712-DS.pdf]] |
|
| ... | ... | \ No newline at end of file |
| 0 | +- datasheet - [[ACS712-DS.pdf]] |
|
| 1 | + |
|
| 2 | +- [[cross-chip-dat]] - [[CC6902-dat]] - [[ACS712-dat]] |
|
| ... | ... | \ No newline at end of file |
Chip-dat/cross-chip-dat/CC6902-dat/2026-07-17-18-50-29.png
| ... | ... | Binary files /dev/null and b/Chip-dat/cross-chip-dat/CC6902-dat/2026-07-17-18-50-29.png differ |
Chip-dat/cross-chip-dat/CC6902-dat/2026-07-17-18-53-26.png
| ... | ... | Binary files /dev/null and b/Chip-dat/cross-chip-dat/CC6902-dat/2026-07-17-18-53-26.png differ |
Chip-dat/cross-chip-dat/CC6902-dat/CC6902-dat.md
| ... | ... | @@ -0,0 +1,31 @@ |
| 1 | +
|
|
| 2 | +
|
|
| 3 | +# CC6902-dat
|
|
| 4 | +
|
|
| 5 | +- [[cross-chip-dat]] - [[CC6902-dat]] - [[ACS712-dat]]
|
|
| 6 | +
|
|
| 7 | +CC6902 是一款高性能单端输出的线性电流传感器，可以更为有效的为交流（AC）或者直流（DC）电流检测方案，广泛应用于工业，消费
|
|
| 8 | +类及通信类设备。
|
|
| 9 | +
|
|
| 10 | +
|
|
| 11 | +CC6902 内部集成了一颗高精度，低噪声的线性霍尔电路和一根低阻抗的主电流导线。当采样电流流经主电流导线，其产生的磁场在霍尔
|
|
| 12 | +电路上感应出相应的电信号，经过信号处理电路输出电压信号，使得产品更易于使用。线性霍尔电路采用先进的 BiCMOS 制程生产，包含了
|
|
| 13 | +高灵敏度霍尔传感器，霍尔信号预放大器，高精度的霍尔温度补偿单元，振荡器，动态失调消除电路和放大器输出模块。在无磁场的情况下，
|
|
| 14 | +静态输出为 50%VCC。
|
|
| 15 | +
|
|
| 16 | +
|
|
| 17 | +在电源电压 5V 条件下，OUT 可以在 0.2~4.8V 之间随磁场线性变化，线性度可达 0.4%。CC6902 内部集成的动态失调消除电路使 IC 的灵
|
|
| 18 | +敏度不受外界压力和 IC 封装应力的影响。
|
|
| 19 | +
|
|
| 20 | +
|
|
| 21 | +## APP SCH
|
|
| 22 | +
|
|
| 23 | +
|
|
| 24 | +
|
|
| 25 | +
|
|
| 26 | +## SCH
|
|
| 27 | +
|
|
| 28 | +
|
|
| 29 | +
|
|
| 30 | +## ref
|
|
| 31 | +
|
Chip-dat/cross-chip-dat/cross-chip-dat.md
| ... | ... | @@ -0,0 +1,7 @@ |
| 1 | +
|
|
| 2 | +# cross-chip-dat
|
|
| 3 | +
|
|
| 4 | +- [[cross-chip-dat]] - [[CC6902-dat]]
|
|
| 5 | +
|
|
| 6 | +
|
|
| 7 | +## ref |
|
| ... | ... | \ No newline at end of file |
Sensor-dat/sensor-power-dat/sensor-current-dat/sensor-current-dat.md
| ... | ... | @@ -2,7 +2,7 @@ |
| 2 | 2 | # current-sensor-dat.md |
| 3 | 3 | |
| 4 | 4 | |
| 5 | - |
|
| 5 | +- [[VRMS-dat]] - [[voltage-dat]] |
|
| 6 | 6 | |
| 7 | 7 | - [[fab-tools-dat]] - [[meter-dat]] |
| 8 | 8 | |
| ... | ... | @@ -30,7 +30,7 @@ |
| 30 | 30 | - Original CC6904 SO-10A SOP-8 Single-chip Hall effect current sensor, isolation voltage 2kV |
| 31 | 31 | |
| 32 | 32 | |
| 33 | - |
|
| 33 | +Yes, the ACS712 output can be read directly by a microcontroller (MCU) Analog-to-Digital Converter (ADC). |
|
| 34 | 34 | |
| 35 | 35 | |
| 36 | 36 |
app-dat/power-bank-dat/2026-07-17-18-48-17.png
| ... | ... | Binary files /dev/null and b/app-dat/power-bank-dat/2026-07-17-18-48-17.png differ |
app-dat/power-bank-dat/power-bank-dat.md
| ... | ... | @@ -156,7 +156,11 @@ HOLTEK合泰电源总控单片机。== HT45SC428 |
| 156 | 156 | 
|
| 157 | 157 | |
| 158 | 158 | |
| 159 | +## SCH
|
|
| 159 | 160 | |
| 161 | +power bank sleep preventer
|
|
| 162 | +
|
|
| 163 | +
|
|
| 160 | 164 | |
| 161 | 165 | ## ref
|
| 162 | 166 |
power-dat/voltage-dat/VRMS-dat/VRMS-dat.md
| ... | ... | @@ -0,0 +1,60 @@ |
| 1 | +
|
|
| 2 | +
|
|
| 3 | +
|
|
| 4 | +# VRMS-dat
|
|
| 5 | +
|
|
| 6 | +- [[VRMS-dat]] - [[ACS712-dat]]
|
|
| 7 | +
|
|
| 8 | +- [[VRMS-dat]] - [[voltage-dat]] - [[current-dat]] - [[sensor-current-dat]]
|
|
| 9 | +
|
|
| 10 | +
|
|
| 11 | +Yes, the ACS712 can absolutely measure AC current. Because it uses a Hall-effect sensor to detect the magnetic field generated by the current passing through the internal copper conduction path, it tracks both positive and negative half-cycles of an AC wave perfectly.
|
|
| 12 | +
|
|
| 13 | +However, because AC current constantly changes direction and magnitude (typically a 50Hz or 60Hz sine wave), reading it with an MCU ADC requires a different approach than reading DC.
|
|
| 14 | +
|
|
| 15 | +Here is how it behaves and how to handle it:
|
|
| 16 | +
|
|
| 17 | +## 1. The AC Waveform Output
|
|
| 18 | +When measuring AC, the ACS712 output voltage will mirror the AC waveform, riding on top of the $2.5\text{ V}$ baseline:
|
|
| 19 | +
|
|
| 20 | +* **No current:** A flat line at exactly $2.5\text{ V}$.
|
|
| 21 | +* **AC current flowing:** A sine wave oscillating above and below $2.5\text{ V}$. For example, if the peak current causes a $0.5\text{ V}$ swing, the output voltage will swing between $3.0\text{ V}$ (positive peak) and $2.0\text{ V}$ (negative peak).
|
|
| 22 | +
|
|
| 23 | +If you simply take a single random ADC read, you will just get a snapshot of a single point on that sine wave, which is useless for calculating power consumption.
|
|
| 24 | +
|
|
| 25 | +---
|
|
| 26 | +
|
|
| 27 | +## 2. How to Read AC with your ADC
|
|
| 28 | +To get a meaningful measurement (like RMS current), your microcontroller needs to sample the waveform rapidly over a set period (usually covering at least one or two full AC cycles).
|
|
| 29 | +
|
|
| 30 | +1. **Sample Rapidly Over a Time Window**
|
|
| 31 | + Loop and read the ADC as fast as possible for a specific duration—usually $20\text{ ms}$ (for a 50Hz wave) or $16.7\text{ ms}$ (for a 60Hz wave) to capture at least one full cycle.
|
|
| 32 | +
|
|
| 33 | +2. **Find the Peak-to-Peak Voltage**
|
|
| 34 | + Track the absolute maximum value ($V_{max}$) and the absolute minimum value ($V_{min}$) recorded during that sampling window. Subtract them to find the total peak-to-peak voltage:
|
|
| 35 | + $$V_{pp} = V_{max} - V_{min}$$
|
|
| 36 | +
|
|
| 37 | +3. **Calculate Peak Voltage**
|
|
| 38 | + Divide the peak-to-peak voltage by 2 to get the peak amplitude relative to the zero-current baseline:
|
|
| 39 | + $$V_{peak} = \frac{V_{pp}}{2}$$
|
|
| 40 | +
|
|
| 41 | +4. **Convert Voltage to RMS Voltage**
|
|
| 42 | + For a pure sinusoidal wave, calculate the Root Mean Square (RMS) voltage by multiplying the peak voltage by $0.707$ (which is $1 / \sqrt{2}$):
|
|
| 43 | + $$V_{rms} = V_{peak} \times 0.707$$
|
|
| 44 | +
|
|
| 45 | +5. **Calculate RMS Current**
|
|
| 46 | + Divide the calculated $V_{rms}$ by your specific sensor model's sensitivity (e.g., $0.185\text{ V/A}$ for the 5A model) to get the true AC RMS current:
|
|
| 47 | + $$I_{rms} = \frac{V_{rms}}{\text{Sensitivity}}$$
|
|
| 48 | +
|
|
| 49 | +
|
|
| 50 | +## 3. Alternative Method: True RMS Calculation
|
|
| 51 | +If your AC load isn't a perfect sine wave (e.g., switching power supplies, dimmed lights), the peak-to-peak shortcut above will be inaccurate. In those cases, you need to calculate the mathematical **True RMS** directly in code:
|
|
| 52 | +
|
|
| 53 | +1. Take a sample and subtract the $2.5\text{ V}$ offset to get the instantaneous voltage delta.
|
|
| 54 | +2. Square that delta value ($V_{delta}^2$) and add it to a running total.
|
|
| 55 | +3. Repeat this for a few hundred samples over a full cycle.
|
|
| 56 | +4. Divide the running total by the number of samples taken (finding the average/mean).
|
|
| 57 | +5. Take the square root of that mean to get $V_{rms}$, then divide by the sensor sensitivity.
|
|
| 58 | +
|
|
| 59 | +
|
|
| 60 | +## ref |
|
| ... | ... | \ No newline at end of file |
power-dat/voltage-dat/voltage-dat.md
| ... | ... | @@ -2,7 +2,7 @@ |
| 2 | 2 | # voltage-dat
|
| 3 | 3 | |
| 4 | 4 | |
| 5 | -
|
|
| 5 | +- [[VRMS-dat]] - [[voltage-dat]]
|
|
| 6 | 6 | |
| 7 | 7 | - [[voltage-dat]] - [[voltage-interverter-dat]] - [[voltage-divider-dat]] - [[voltage-reference-dat]]
|
| 8 | 8 |