WO2016206020A1

WO2016206020A1 - Fast charge power bank

Info

Publication number: WO2016206020A1
Application number: PCT/CN2015/082210
Authority: WO
Inventors: 魏忠
Original assignee: 深圳市迈思普电子有限公司
Priority date: 2015-06-24
Filing date: 2015-06-24
Publication date: 2016-12-29

Abstract

A fast charge power bank comprises a lithium titanate battery (21) mounted on a battery protection circuit board (20), a charging circuit (10) used to charge the lithium titanate battery, an output circuit (30) outputting an electrical power of the lithium titanate battery to fast charge an electronic product, an MCU (40) controlling charge and discharge, and a battery voltage dividing resistor (23) mounted on the battery protection circuit board. The present invention enables a power bank to have the advantages of a fast charging speed, high safety, and high conversion efficiency.

Description

Rapid charging mobile power

技术领域 Technical field

The invention relates to the field of mobile power, and in particular to a rapid charging mobile power supply.

Background technique

Traditional mobile power supplies generally use lithium-ion batteries for energy storage, and their usage ratios are all in the 1C range. Both charging and discharging are implemented by 5V step-down charging and output boosting.

For example, Chinese Patent No. 201210071774.4 discloses a mobile power source including a battery, a charging control circuit, a battery protection circuit, an MCU control circuit, and a DC-DC. The boosting circuit has a charging control circuit having an input terminal connectable to an external power source, an output end of the charging control circuit is electrically connected to an input end of the cell protection circuit, and the battery is electrically connected to the cell protection circuit, and the cell protection circuit Electrically connected to the DC-DC boost circuit, MCU The control circuit is electrically connected to the DC-DC boost circuit, and further includes an automatic identification circuit for identifying the connected load device, and the automatic identification circuit is electrically connected to the MCU control circuit. The above-mentioned patent disclosed mobile power supply DC-DC The booster circuit is externally discharged. However, when the power of the battery is boosted, there is inevitably an energy loss, resulting in low power conversion efficiency.

Summary of the invention

In view of this, the present invention is directed to the absence of the prior art, and its main object is to provide a charging mobile power source with high charging speed, high safety performance and high conversion efficiency.

In order to achieve the above object, the present invention adopts the following technical solutions:

A rapid charging mobile power source, comprising a lithium titanate battery installed on a battery protection board, a charging circuit for charging the lithium titanate battery, an output circuit for rapidly charging the electric energy output of the lithium titanate battery to the electronic product, and an implementation The charging and discharging controlled MCU, the charging circuit and the output circuit are connected to the battery protection board, and the battery protection board is provided with a battery protection circuit and a battery voltage dividing resistor suitable for a lithium titanate battery, the battery protection circuit and the battery The voltage dividing resistor is connected to the lithium titanate battery, and the battery voltage dividing resistor is a voltage detecting terminal WD01+ of the circuit loaded on the battery protection board. The pull-down resistor R9 on VDD is formed so that the voltage at the FB point on the circuit corresponds to the standard value of the lithium titanate battery.

As a preferred solution, the lithium titanate battery of the battery protection board is formed by two lithium titanate batteries with a power ratio of 6 C and a power of 2.3-2.8 V in series to form a battery pack having a voltage of 4.6-5.6 V.

As a preferred solution, the battery protection circuit is constructed using two 8025 chips back-to-back in parallel.

As a preferred solution, the charging circuit is provided with an overcharge protection circuit, an overvoltage protection circuit and a reverse backflow protection circuit.

As a preferred solution, the overvoltage protection circuit is composed of two 4435 chips to prevent voltage from passing through.

As a preferred solution, the reverse backflow protection circuit is composed of two 3904 MOS transistors.

As a preferred solution, the output circuit is provided with a USB interface and a USB current limiting protection circuit connected to the USB interface.

As a preferred solution, the USB current limiting protection circuit is composed of a TD9517 chip.

Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, it can be known from the above technical solution that a lithium titanate battery is used as a battery core on a mobile power source, and the lithium titanate battery is synchronized in a battery protection board. The battery voltage divider resistor is designed to be protected. With the characteristics of the lithium titanate battery, the circuit design omits the process of step-down charging and boosting discharge, so that the present invention can be charged under the same capacity as the conventional mobile power source. The time is shortened by 80%, and the output discharge efficiency can be as high as 98-100% conversion. In short, the mobile power source of the invention has the advantages of fast charging speed, high safety performance and high power conversion efficiency, and can quickly supply power to mobile phones, tablet computers and other electronic products within 5-8 minutes, breaking the long charging time of the traditional mobile power source. The bottleneck of high power conversion loss and low product safety performance.

DRAWINGS

1 is a circuit block diagram of a preferred embodiment of the present invention;

Figure 2 is a circuit diagram of a battery protection panel in accordance with a preferred embodiment of the present invention.

Description of the figure:

10, charging circuit 11, overcharge protection circuit

12, overvoltage protection circuit 13, reverse backflow protection circuit

20, battery protection board 21, lithium titanate battery

22, battery protection circuit 23, battery divider resistor

30, output circuit 31, USB current limiting protection circuit

40, MCU

detailed description

Please refer to FIG. 1 and FIG. 2, which shows a specific structure of a preferred embodiment of the present invention, which is a rapid charging mobile power supply, and the structure thereof comprises a charging circuit 10, a battery protection board 20, an output circuit 30, and MCU 40 Four modules. The charging circuit 10 is electrically connected to the power input end of the battery protection board 20 to realize the charging function of the lithium titanate battery 21. The output circuit 30 is electrically connected to the power output end of the battery protection board 20 to rapidly charge the electronic product of the lithium titanate battery 21 to the electronic product. The MCU 40 is electrically connected to the charging circuit 10, the battery protection board 20, and the output circuit 30, and detects the voltage change of the lithium titanate battery 21 in real time to realize charge and discharge control to ensure charging safety.

The battery protection plate 20 has a lithium titanate battery 21, a battery protection circuit 22 suitable for the lithium titanate battery 21, and a battery voltage dividing resistor 23. The lithium titanate battery 21 is used as an energy storage main core, and is formed by two lithium titanate batteries with a magnification of 6 C and an electric energy of 2.3-2.8 V in series to form a battery pack having a voltage of 4.6-5.6 V, and the strongest energy is Between 4.8-5.2V, with this feature, the lithium titanate battery 21 can be directly charged when charging, no need to reduce voltage, achieve zero loss, lithium titanate battery 21 can directly charge the load when discharging, no need to boost, The power reaches 100% conversion.

The conventional lithium titanate battery does not have a suitable protection IC on the market. For the lithium titanate battery 21, the battery protection circuit 22 and the battery voltage dividing resistor 23 are designed on the battery protection board 20, and the battery protection circuit 22 is provided. The two 8025 chips are used in parallel back to back. The battery voltage dividing resistor 23 is composed of a pull-down resistor R9 having a nominal resistance value of 820R. On the voltage detecting terminal WD01+ circuit of the battery protection IC (8025 chip) of the battery protection board 20, the VDD pin pull-down 820R resistance is 1%. The voltage of the tantalum lithium titanate battery is adapted to the protection IC of the conventional lithium battery (8025 chip), so that the voltage of the FB point on the circuit corresponds to the standard value of the lithium titanate battery 21, and the protection is provided.

The invention makes a constant current and constant voltage function design on the charging circuit 10, ensures that the charging current of the product is directly stabilized at a set value, and direct charging reduces the energy conversion loss brought by the conventional step-down, and realizes an electric loss of almost zero loss. MCU 40 Real-time detection of battery voltage changes confirms that charging is safe enough. In this embodiment, the charging circuit 10 is electrically connected to the charging end of the lithium titanate battery 21, and the charging circuit 10 is provided with an overcharge protection circuit 11, an overvoltage protection circuit 12, and a reverse backflow protection circuit 13. The overvoltage protection circuit 12 is composed of two 4435 chips to prevent voltage from passing through. The reverse backflow protection circuit 13 is composed of two 3904 The MOS tube is constructed to avoid the problem of backflow. The overcharge protection circuit automatically turns off the power when the lithium titanate battery 21 is full. Through the design of the charging circuit 10, the invention breaks the traditional step-down electric charging mode, directly adopts direct charging, fast and large current charging, and saves the power loss of the traditional step-down charging.

The output circuit 30 of the present invention is electrically connected to the discharge end of the lithium titanate battery 21, and a USB interface and a USB current limiting protection circuit 31 connected to the USB interface are disposed on the output circuit 30. The USB current limiting protection circuit 31 is composed of a TD9517 chip. When the product is discharged externally, the voltage of the lithium titanate battery 21 can be directly charged to the mobile phone and other electronic devices at a voltage of about 5.2V, without adding a booster circuit, and the two-port lithium titanate battery is used in series to directly connect the electronic device. The design of the discharge realizes the straight-through charging, which reduces the power loss caused by the traditional boosting, and realizes the electric energy conversion efficiency as high as 98-100%.

In summary, the design of the present invention focuses on the use of a lithium titanate battery 21 as a battery core on a mobile power source, and an adaptive battery voltage dividing resistor 23 is designed on the battery protection board 20 for the lithium titanate battery 21 in synchronization. Protection, by the characteristics of the lithium titanate battery 21, the circuit design omits the process of step-down charging and boosting discharge, so that the charging time is shortened by 80% compared with the conventional mobile power source, and the output can be realized at the output. The discharge efficiency is as high as 98-100% conversion. In short, the mobile power source of the invention has the advantages of fast charging speed, high safety performance and high power conversion efficiency, and can quickly supply power to mobile phones, tablet computers and other electronic products within 5-8 minutes, breaking the long charging time of the traditional mobile power source. The bottleneck of high power conversion loss and low product safety performance.

The above is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments in accordance with the technical spirit of the present invention are still It is within the scope of the technical solution of the present invention.

Claims

A rapid charging mobile power source, comprising: a lithium titanate battery mounted on a battery protection board, a charging circuit for charging the lithium titanate battery, and an output circuit for rapidly charging the electric energy output of the lithium titanate battery to the electronic product; And an MCU that implements charge and discharge control, the charging circuit and the output circuit are connected to the battery protection board, and the battery protection board is provided with a battery protection circuit and a battery voltage dividing resistor suitable for the lithium titanate battery, the battery The protection circuit and the battery voltage dividing resistor are connected to the lithium titanate battery; the battery voltage dividing resistor is a voltage detecting terminal WD01+ of the circuit loaded on the battery protection board. The pull-down resistor R9 on VDD is formed so that the voltage at the FB point on the circuit corresponds to the standard value of the lithium titanate battery.
The rapid charging mobile power source according to claim 1, wherein the lithium titanate battery of the battery protection board is formed by connecting two lithium titanate batteries having a magnification of 6 C and an electric energy of 2.3 to 2.8 V in series. 4.6-5.6V battery pack.
The rapid charging mobile power supply of claim 1 wherein said battery protection circuit is constructed using two 8025 chips back-to-back in parallel.
The rapid charging mobile power source according to claim 1, wherein the charging circuit is provided with an overcharge protection circuit, an overvoltage protection circuit, and a reverse backflow protection circuit.
The rapid charging mobile power supply according to claim 4, wherein said overvoltage protection circuit is composed of two 4435 chips to prevent voltage from passing through.
The rapid charging mobile power supply according to claim 4, wherein said reverse backflow protection circuit is composed of two 3904 MOS tube is formed.
The rapid charging mobile power supply according to claim 1, wherein the output circuit is provided with a USB interface and a USB current limiting protection circuit connected to the USB interface.
The rapid charging mobile power supply according to claim 7, wherein said USB current limiting protection circuit is composed of a TD9517 chip.