12V Batteryless Charging System Patent Guide
Patents have been obtained in Japan and the United States for the device that supplies power to a time-coordinated charging system that is close to 100% and the battery knock-on. The Japanese registration number is "Patent No. 6896357" and the US registration number is "11715969".
See below for technical details.
"Ingenuity to supply power to the cooperative charging system for nearly 100% of the time"
The concept of this system is to be useful in the event of a power outage or disaster.
However, in a 12V batteryless system that is not devised in particular, if there is no power supply from the AC adapter due to a power failure, power will not be supplied to the control circuit of the "12V batteryless system", and the system will be useless when it matters most. increase.
Therefore, "devise to supply power to the time-coordinated charging system close to 100%" has been done.
"First, please take a look at the drawing." This is the explanation of "the idea of supplying power to a time-coordinated charging system that is close to 100%".
1.
・A node that converts the power from a solar cell to 5V
・Node from AC adapter
・Node from mobile battery
Power is supplied from three places via diodes. Power is supplied from three different sources, each with different characteristics. If power is supplied from any one of the three types, the control circuit of the "12V batteryless system" will operate.
2. An electric double layer capacitor is connected to the power node of the control circuit of the "12V Batteryless System". Electric double layer capacitors with a large capacity such as 1F are sold for around 100 yen. (*1)
3. The left side of the two inverters consists of nMOS + resistor, and the right side consists of nMOS + resistor + pMOS. By doing this, it is possible to keep the current consumption extremely low when power is not being supplied from the solar cell.
We believe that the current consumption when power is not supplied from the solar cell is on the order of 1uA.
1 increases the probability that power is supplied from the outside, 2 allows power to be supplied from the electric double layer capacitor even if power is not supplied from the outside, and 3 reduces the current consumption and carefully uses the power from the electric double layer capacitor. increase.
Even if power is not supplied from the outside, it operates on power from the electric double layer capacitor for 6 hours (*1). With these three ideas, it is possible to "supply power to the coordinated charging system nearly 100% of the time" and operate even during power outages and disasters.
*1 By using a more expensive electric double layer capacitor, it is known that it can operate with the power from the electric double layer capacitor for 3 days.
Close "Ingenuity to supply power to the cooperative charging system for nearly 100% of the time"
"Battery Wake Up"
A mobile battery can be connected to the "12V batteryless system". At night, you can charge your USB device from the mobile battery.
However, mobile batteries stop supplying power when the USB device to be charged is unplugged and is no longer connected.
After that, even if you connect the USB device to be charged again, it will not automatically recharge. "Technology that can solve this problem is incorporated."
This time, I will talk about them.
Last time, I wrote about how to supply power to the power node of the control circuit of the "12V batteryless system" for nearly 100% of the time.
The solution is to "connect a resistor of about 1 MΩ" from the power node to the USB output node.
Why is this "battery wake-up" realized?
According to our research, many mobile batteries detect that a USB device has been connected when there is a sudden drop in voltage in a short period of time, and restart power supply.
Therefore, if the voltage suddenly drops in a short time, the power supply will be restarted.
To do this, the voltage should be kept high when the USB device to be charged is not connected.
To do this, the control circuit's power node, which is powered nearly 100% of the time, draws a small amount of current to keep the voltage at the USB output node high when no USB device is connected. It is.
Then, the moment the USB device to be charged is connected, the voltage will drop suddenly in a short time.
The figure shows a state in which the voltage is normally maintained at a high level of about 1 MΩ, but the moment the USB device to be charged is connected, the voltage suddenly drops in a short period of time, and the power supply is resumed from the mobile battery. is.
Thanks to this mechanism, if you use the USB device to be charged, it will automatically charge from the mobile battery, which is convenient.
However, not all mobile batteries support this "battery trigger".
Also, if one or more USB devices to be charged are already connected, and the mobile battery determines that the USB device to be charged is fully charged and stops supplying power, connect about 1 MΩ. However, the USB output node does not reach a high voltage, so even if you connect an additional USB device to be charged, it will not "wake up the battery". If the "battery wake-up" does not work, press the power button on the mobile battery to manually restart the power supply.
Close Battery Wakeup
Here is my registration certificate.
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License fee ... 1.0% of the shipping amount
Contract fee: 50,000 yen
License fee ... 0.8% of the shipping amount
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If you use either the Japanese patent or the US patent, the fee will be the same if you use both.
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Even if there are multiple people who have found a patent infringer, provided information, or introduced a license agreement, the total will be 10%.
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