Portable Power Station
The portable energy storage power supply is a multifunctional portable AC and DC emergency mobile power device. It has a safe lithium-ion battery and inverter conversion technology, and has a “backup power station” with lightweight, high capacity, and high power.
Can provide you with convenient mobile power solutions, which are widely used in a mobile office, medical rescue, fire emergency rescue, power equipment repair, environmental protection, emergency communication support, and on-board power reserve, outdoor sports, recreation, and field operations, Construction site lighting and other places.
Technical features of the portable power station
1. Lightweight, small size, easy to carry
2. AC 220V/110V output
3. LED emergency lighting, 24V/12V cigarette lighter output, 5V, 9V, 12V, and other USB output
4. Using lithium-ion battery, safe, reliable, and environmentally friendly
5. With LCD screen display
6. High-power PD, QC protocol TYPE-C port output
7. Independent over-voltage, over-temperature, overload, over-charge, over-discharge, and short-circuit protection of the battery pack, automatic recovery
Function definition selection of portable power station
1. Portable power station input, AC/DC input charging power definition, high efficiency, wide voltage, meeting safety design requirements.
2. Portable power station battery capacity and serial-parallel mode, as well as lithium battery protection circuit, battery equalization technology
The reason why lithium battery (rechargeable type) needs protection is determined by its own characteristics. Since the material of the lithium battery itself determines that it cannot be overcharged, over-discharged, overcurrent, short-circuited, and ultra-high temperature charging and discharging, the lithium battery components of the lithium battery will always appear with a delicate protection board and a current fuse.
The protection function of lithium batteries is usually completed by a protection circuit board and current devices such as PTC.
The protection board is composed of electronic circuits, which can accurately monitor the voltage of the battery cell and the charging and discharging circuit at all times under the environment of -40°C to +85°C. Current, timely control the on and off of the current loop; PTC prevents severe damage to the battery in high-temperature environments.
Balance charging is the charging method required by all lithium battery packs, but in many low-power applications, there is actually no balanced charging. For example, most laptop battery packs have a considerable impact on battery life. We use the latest Balanced charging technology.
Existing equalization technologies are mainly divided into equalization of energy transfer between batteries and equalization of external energy input. The energy balance between batteries is to charge the energy of the high-capacity battery to the low-capacity battery. The biggest problem with this method is that it is very complicated to control.
Many dedicated chips or single-chip solutions use external equalization, which is achieved through controllable energy consumption. In this way, an energy-consuming element is generally used to consume energy, so as to wait for other battery cells to be fully charged or to reduce the voltage of some cells. The disadvantage of this scheme is that the energy consumption on the Zener diode is too large, and the resulting heat cannot be tolerated.
Another switch array in balanced charging is realized with power MOSFETs. This approach is costly and complex, the tubes are all working in the on-off state, and consume little energy. In addition, the battery does not have a diode in series to obtain the maximum output.
The shortcoming is that the circuit is more complicated because the voltage of each battery needs to be matched, so the input charging circuit is required to be isolated.
3. Portable power station Display, with the LCD screen or digital tube display mode, display content: power, voltage, battery capacity, battery life, etc., and the accuracy of power display is required.
A fuel gauge chip is connected in series to the protection circuit of the battery, in which an integrated resistor is connected in series, and the resistance value is generally between 20 and 30 milliohms.
The basic principle is that a sampling resistor is integrated into the chip. When different voltages are generated after different currents flow, the chip integrates this voltage (actually converted into current) and time to obtain the correct amount of electricity when the user is using it (note, The unit of power is mAh).
Many chips can achieve this function, TI and MAXIM semiconductor chip companies have similar products. After the battery adds this chip, the cost increases, and the MCU also puts forward “communication” requirements.
Then after the chip obtains the capacity through real-time integration, the capacity (unit is mAh) data is stored in the chip’s EEPROM, and according to the needs of the mobile phone, it is transmitted to the MCU or DSP through the communication line. The accurate capacity of the battery is obtained.
The coulomb counter chip, that is, the memory of the fuel gauge chip usually contains the following basic battery information:
The initial capacity of the battery (mAh), that is, the rated capacity, the capacity obtained after a battery is fully charged and discharged.
The current capacity of the battery (mAh), the battery capacity when in use.
The current flowing through (mA) is the current consumption of the mobile phone.
4. Portable power station AC output, inverter output, what method is used. Square wave inverter mode, modified wave inverter mode, pure sine wave inverter model.
The output of the square wave inverter mode is a poor quality square wave alternating current, and its maximum value in the positive direction to the maximum value in the negative direction is generated almost at the same time. This will cause severe and unstable effects on the load and the inverter itself.
At the same time, its load capacity is poor, only 40%-60% of the rated load, and it cannot carry inductive loads such as motors, washing machines, refrigerators, relays, and fluorescent lamps.
If the load is too large, the third harmonic component contained in the square wave current will increase the capacitive current flowing into the load, which will damage the power filter capacitor of the load in severe cases. But the cost is low and more people adopt it.
Compared with the square wave, the output voltage waveform of the modified wave inverter method is significantly improved, and the content of high-order harmonics is also reduced. The traditional modified wave inverter is produced by the stepwise superposition of square wave voltage.
This method has complicated control circuits, more power switch tubes used in superimposed lines, and larger volume and weight of the inverter, etc. Many problems. In recent years, with the rapid development of power electronics technology, the PWM pulse width modulation method has been widely used to generate the corrected wave output.
The modified sine wave inverter method is suitable for loads with resistive electrical appliances that do not require high power quality.
The pure sine wave inverter output is the same or even better sine wave AC power as the grid we use daily. In summary, pure sine wave inverters provide high-quality alternating current, high efficiency, stable sine wave output, high-frequency technology, small size, lightweight, low interference to radios, communication equipment, and precision equipment, and low noise. Strong load adaptability.
It can drive any kind of load (including inductive loads such as TV sets, LCD monitors, refrigerators, etc.) without interference (such as Weng Weng sound and TV noise). However, the technical requirements and costs are relatively high.
5. Portable power station DC output, it needs several sets of voltage and current, whether it needs PD, QC protocol TYPE-C port output, whether its voltage and current need to be customized.
USB Type-C has the following features: The maximum data transmission speed reaches 10Gbit/sec, which is also the standard of USB 3.1; The size of the Type-C interface socket end is about 8.3mm×2.5mm slim design; Supports plug-in from both sides
The “positive and negative plug” function can withstand 10,000 times of repeated plugging and unplug; the standard specification cable equipped with a Type-C connector can pass 3A current, and it also supports “USB PD” that exceeds the existing USB power supply capacity, which can provide maximum 100W of electricity.
At present, most of the PD and QC protocol chips on the market have a set output voltage and current. Due to the lack of software, customized design requires higher design capabilities for solution companies.
Project case, a two-in-one chip solution for USB Type-C interface controller and Power Delivery controller. This chip fully meets the relevant specifications in the USB 3.1 standard set.
The solution chip provides a flexible programmable architecture that allows continuous firmware upgrades to meet future standard updates. It integrates the necessary digital logic and analog circuits to realize the detection and control of the Type-C interface, the physical layer BMC coding in the PD power supply protocol, and the protocol layer transceiver status control.
At the same time, it also integrates a high-performance MCU core to achieve PD power supply The upper-layer policy management and local system configuration management in the protocol.
By adopting this solution architecture, a complete PD/Type-C system can be realized, including the control and management of the SRC/SNK/DRP interface mode and the corresponding PD power supply protocol interaction and strategy management state machine.
It also provides necessary external communication interfaces to support interaction with higher-level systems. At the same time, more system modules are integrated, which reduces the demand for chip peripheral materials. Combined with flexible and customizable firmware, customers can easily and quickly deploy the PD/Type-C system on various system products, greatly shortening the development cycle and cost.