Considering that the non-stop charging system implemented in China adopts a two-piece vehicle electronic tag, it requires a strong power module for the vehicle electronic tag to provide sufficient power for the working module (reading module, DSRC receiving and transmitting module, etc.). . Traditional automotive electronic tags generally use 3.7V high-performance lithium batteries, and the usage time is generally about two years. Since the in-vehicle electronic tag is fixed on the vehicle once, it is not allowed to disassemble it. After the battery is exhausted, it is very inconvenient to replace the battery and go to the designated maintenance organization for disassembly. To this end, Shanghai Donghai Computer is the first in China to introduce a solar-charged car-mounted electronic tag, using a rechargeable lithium-ion battery + glare-type solar charging module + external charger to extend the life of the electronic tag to 5 Over the years, the burden on issuing service outlets and car owners has been greatly reduced.
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First, the solar electronic tag function module schematic
Second, solar electronic tag power supply instructions
1. Adopt 4.2V 270mAH (or 650mAH) rechargeable lithium ion battery + glare solar charging module + external charger mode;
2. The rechargeable lithium battery has a full charge of more than 500 times and a service life of more than 7 years;
3. Strong light solar panel: power 0.048W, current 10mA ± 1 mA, open circuit voltage 4.8V, wafer conversion rate of 15%, service life of more than 10 years;
4. It has “HOLD†function for overcurrent, overtemperature, undervoltage, overcharge and short circuit protection. This makes the protection action extremely reliable. Completely avoiding the battery being damaged, completely avoiding over-discharge or short-circuit, resulting in shortened battery life, and completely avoiding the possibility of repeatedly turning off the damage protection board;
5. Have a low battery alarm module;
6. The calculation of the electronic charging effect of the electronic tag is as follows:
1 4.2V rechargeable lithium battery can be used for at least 1~2 years before the electronic label leaves the factory;
2 4.8V solar charging current up to 10mA (generally 2mA), far greater than the self-discharge current of the electronic tag (<5μA);
3 According to the national standard, the electronic label meets 10 trading requirements per day:
The average operating current of the non-contact CPU card is about 60mA, the transaction time is about 250ms, and the 50ms pre-read IC card information time working current is about 50mA, and the waiting current of 1s is about 10mA. The total power consumption calculation formula for 1 day is as follows:
10 × 60 mA × 0.25 s + 10 × 50 mA × 0.05 s + 10 × 10 mA × 1 s + 5 μA × 24 × 3600 s ≈ 0.2 mAH
Trading work power consumption pre-reading card power consumption transaction waiting for power consumption 1 day self-discharge 1 day total power consumption
The average operating current of the contact CPU card is about 30mA, the transaction time is about 250ms, and the 50ms pre-read IC card information time working current is about 50mA, and the waiting current of 1s is about 10mA. The total power consumption calculation formula for 1 day is as follows:
10 × 30 mA × 0.25 s + 10 × 50 mA × 0.05 s + 10 × 10 mA × 1 s + 5 μA × 24 × 3600 s ≈ 0.18 mAH
Trading work power consumption pre-reading card power consumption transaction waiting for power consumption 1 day self-discharge 1 day total power consumption
4 The sunlight exposure time is about 8~10 hours, and the solar micro-current charging energy is 16mAH~20mAH;
5 10 trading calculations per day: If the sun is sufficient to ensure 2mA charging current, 0.2mAH/2mA ≈ 360s, that is, 6 minutes can meet the 1 day working power demand; when the charging current is 1mA, 12 minutes can meet the 1 day working power demand; Normal light 200μA charging current can meet 1 day working power demand in 1 hour;
6 50 trading calculations per day: If the sun is sufficient to ensure 2mA charging current, 0.5mAH/2mA ≈ 900s, that is, 15 minutes can meet the 1 day working power demand; when the charging current is 1mA, 30 minutes can meet the 1 day working power demand; Ordinary light 200μA charging current for 2.5 hours can meet the 1-day working power demand;
7 Added the way to charge the electronic tag by an external portable charger. If you encounter a special climate, such as a long rainy day (the rainy season), you can use this charger to charge. The external portable charger has short-circuit protection and overload protection, and has anti-surge protection.
Third, the test and application of solar electronic tags
The East China Sea Solar Electronic Label (Model: TQXS6-SD-OBU-II) has passed the physical layer inspection and protocol interoperability testing of the National Traffic Safety Facilities Quality Supervision and Inspection Center.
Recently, in the bidding test of ETC equipment organized by Jiangsu Province, a special solar charging test was conducted on the East China Sea solar tag. The test method is to consume the power of the electronic tag until it can not be traded, and then charge it in ordinary daylight for 8 hours, and then perform continuous transaction of the non-contact CPU card, and the number of transactions is more than 1000 times, which achieves the design effect of solar charging.
At present, the East China Sea solar electronic label has been fully supplied to the Shanghai ETC system in large quantities. More than 85% of the Shanghai ETC users are equipped with new solar electronic labels. After nearly half a year of actual use, the users have reported good results.
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