comparison: content/ZPB30A1.rst
content/ZPB30A1.rst
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| 24 - battery capacity test mode: in this mode, you set the discharge | 24 - battery capacity test mode: in this mode, you set the discharge |
| 25 current and the lower voltage limit at which the discharge test | 25 current and the lower voltage limit at which the discharge test |
| 26 stops. It displays the total discharged capacitu (in Ah) and energy | 26 stops. It displays the total discharged capacitu (in Ah) and energy |
| 27 (in Wh). | 27 (in Wh). |
| 28 | 28 |
| 29 .. image:: {filename}images/ZPB30A1/zpb30a1.jpg | 29 .. image:: {static}images/ZPB30A1/zpb30a1.jpg |
| 30 :alt: Overall view of the ZPB30A1 electronic load | 30 :alt: Overall view of the ZPB30A1 electronic load |
| 31 | 31 |
| 32 The device looks pretty nice and reasonably well built. It can do 4 | 32 The device looks pretty nice and reasonably well built. It can do 4 |
| 33 wire measurements. | 33 wire measurements. |
| 34 | 34 |
| 35 The device itself is built around a single ST W60N10 N channel MOS | 35 The device itself is built around a single ST W60N10 N channel MOS |
| 36 transistor (100V, 60A, 200W) and a STM8S005K6 microcontroller. | 36 transistor (100V, 60A, 200W) and a STM8S005K6 microcontroller. |
| 37 | 37 |
| 38 .. image:: {filename}images/ZPB30A1/zpb30a1_board.jpg | 38 .. image:: {static}images/ZPB30A1/zpb30a1_board.jpg |
| 39 :alt: Main PCB of the ZPB30A1 electronic load | 39 :alt: Main PCB of the ZPB30A1 electronic load |
| 40 | 40 |
| 41 The shunt resistor is a 10mΩ wire. A very small value that explains | 41 The shunt resistor is a 10mΩ wire. A very small value that explains |
| 42 the rather big minimal current of 200mA (which means a voltage drop as | 42 the rather big minimal current of 200mA (which means a voltage drop as |
| 43 low as 2mV). | 43 low as 2mV). |
| 44 | 44 |
| 45 .. image:: {filename}images/ZPB30A1/zpb30a1_mosfet.jpg | 45 .. image:: {static}images/ZPB30A1/zpb30a1_mosfet.jpg |
| 46 :alt: Main transistor of the ZPB30A1 electronic load | 46 :alt: Main transistor of the ZPB30A1 electronic load |
| 47 | 47 |
| 48 One nice thing with this device is the fact that every component value | 48 One nice thing with this device is the fact that every component value |
| 49 is written on the PCB: no need to use the magnifier to read the SMD | 49 is written on the PCB: no need to use the magnifier to read the SMD |
| 50 parts values. | 50 parts values. |
| 51 | 51 |
| 52 The bottom side of the PCB is pretty empty besides the ground plane. | 52 The bottom side of the PCB is pretty empty besides the ground plane. |
| 53 | 53 |
| 54 .. image:: {filename}images/ZPB30A1/zpb30a1_bottom.jpg | 54 .. image:: {static}images/ZPB30A1/zpb30a1_bottom.jpg |
| 55 :alt: Bottom side of the PCB of the ZPB30A1 electronic load | 55 :alt: Bottom side of the PCB of the ZPB30A1 electronic load |
| 56 | 56 |
| 57 | 57 |
| 58 The most annoying thing is the minimum current of 200mA, which pretty | 58 The most annoying thing is the minimum current of 200mA, which pretty |
| 59 hight. It's obviously not designed for small battery or PSU | 59 hight. It's obviously not designed for small battery or PSU |
| 78 | 78 |
| 79 So I've probed a bit to see if there are any signals. | 79 So I've probed a bit to see if there are any signals. |
| 80 | 80 |
| 81 The overall (messy) setup was: | 81 The overall (messy) setup was: |
| 82 | 82 |
| 83 .. image:: {filename}images/ZPB30A1/overall_setup.jpg | 83 .. image:: {static}images/ZPB30A1/overall_setup.jpg |
| 84 :alt: Overall testing setup for the ZPB30A1. | 84 :alt: Overall testing setup for the ZPB30A1. |
| 85 | 85 |
| 86 During this test, the electronic load was sunking almost 1A at 30V, | 86 During this test, the electronic load was sunking almost 1A at 30V, |
| 87 thus dissipating around 30W. The MOSFET transistor was getting a bit | 87 thus dissipating around 30W. The MOSFET transistor was getting a bit |
| 88 hot. I measured 65°C with my cheap IR thermometer. | 88 hot. I measured 65°C with my cheap IR thermometer. |
| 90 The F pin shows a square signal at 50kHz, and there is some activity on | 90 The F pin shows a square signal at 50kHz, and there is some activity on |
| 91 the T pin. I've used my new Rigol DS1054Z scope to try to find out if | 91 the T pin. I've used my new Rigol DS1054Z scope to try to find out if |
| 92 the signal is meaningful. And after playing a bit with the Serial | 92 the signal is meaningful. And after playing a bit with the Serial |
| 93 decoder, I finally found that: | 93 decoder, I finally found that: |
| 94 | 94 |
| 95 .. image:: {filename}images/ZPB30A1/DS1Z_serial.png | 95 .. image:: {static}images/ZPB30A1/DS1Z_serial.png |
| 96 :alt: Serial signal on the T pin. | 96 :alt: Serial signal on the T pin. |
| 97 | 97 |
| 98 When the ZPB30A1 was actually set up like this: | 98 When the ZPB30A1 was actually set up like this: |
| 99 | 99 |
| 100 .. image:: {filename}images/ZPB30A1/zpb30a1_setup.jpg | 100 .. image:: {static}images/ZPB30A1/zpb30a1_setup.jpg |
| 101 :alt: Testing setup for the ZPB30A1. | 101 :alt: Testing setup for the ZPB30A1. |
| 102 | 102 |
| 103 So the measured voltage is constantly written on the serial port at | 103 So the measured voltage is constantly written on the serial port at |
| 104 115200 baud, 8N1. The third value is 1 when it is normally operating, | 104 115200 baud, 8N1. The third value is 1 when it is normally operating, |
| 105 and 0 when the voltage is below the limit. | 105 and 0 when the voltage is below the limit. |
