Quick charging circuit for battery pack of electric tool

Abstract

The utility model discloses an electric tool battery pack fast charging circuit comprising a battery protection module and a fast charging module, the battery protection module comprises U2, R1, R2, R3, R4, R5, R6, R7, R12, R13, R15, R16, D1, D2, D3, MN1, Q1, NTC, RTS1, RTS2, Rsens, Rsens1, C1, C2, C3, C4, C5, C6, C8, B +, B-, P +, P-and C +, pins 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 13, 14 and 15 of U2 are respectively connected with R1, R2, R3, R4, R5, R6, R7, C8, RTS1, RTS2, R12, R13, R16 and R15, the output end of B + is connected with D1 and According to the utility model, through the battery protection module and the rapid charging module, the charging speed is fast, the battery saturation capability is strong, chargers among various products are universal, the charging modes are diversified, the limitation on users is low, and the charging time is short.

Description

Technical Field

[0001] The utility model belongs to the field of fast charging circuits for power tool battery packs, and particularly relates to a fast charging circuit for a power tool battery pack. Background Art

[0002] A power tool is a tool that uses an electric motor or an electromagnet as power and drives a working head to perform operations through a transmission mechanism. At present, the charging method of the existing electrician tool battery pack is relatively traditional, with a slow charging speed, poor battery saturation ability, and chargers cannot be used interchangeably between products. The charging method is single, and it cannot achieve multiple functions with one item, which has a high restriction on users. The charging time of the existing technology is relatively long, which is inconvenient for long-term users. Content of the Utility Model

[0003] The purpose of the utility model is to provide a fast charging circuit for a power tool battery pack, aiming to solve the problems existing in the above background art. To achieve the above purpose, the technical solution adopted by the utility model is:

[0004] A fast charging circuit for a power tool battery pack includes a battery protection module and a fast charging module. The battery protection module includes U2, R1, R2, R3, R4, R5, R6, R7, R12, R13, R15, R16, D1, D2, D3, MN1, Q1, NTC, RTS1, RTS2, Rsens, Rsens1, C1, C2, C3, C4, C5, C6, C8, B+, B-, P+, P- and C+. Pins 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 13, 14 and 15 of U2 are respectively connected with R1, R2, R3, R4, R5, R6, R7, C8, RTS1, RTS2, R12, R13, R16 and R15. The output end of B+ is connected with D1 and R2, the other end of D1 is connected with R1, the output end of B2 is connected with R3, the output end of B3 is connected with R4, the output end of B4 is connected with R5, the output end of B5 is connected with R6, the output end of P+ is connected with B+, Q1 and D3, the output end of C+ is connected with D2, the output end of D2 is connected with Q1 and R7, the output end of R7 is connected with R16, the output end of P- is connected with D3, R15 and MN1, the output end of B- is connected with Rsens, NTC and Rsens1, the output end of Rsens is connected with MN1 and R12, MN1 is also connected with R13, the other end of NTC is connected with RTS1 and RTS2, and C1, C2, C3, C4, C5 and C6 are respectively connected between NTC and R1, R2, R3, R4, R5 and R6;

[0005] The fast charging module includes U1, USBC1, Q1, Q2, Q5, H1, H2, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R21, R22, R32, R33, C1, C2, C3, C4, C7, C8, C10, C12, C13, C14, C15, C16, C17, C22, C25, C26, L1, LED1, LED2. Pin 9 of USBC1 is connected to R5 and P. C3 and R10 are connected between pin 9 of USBC1 and P. R5 is in parallel with Q5. The other end of Q5 is connected to R2, P and C12. C7 and C4 are connected between Q5 and P. C12 is connected to pin 4 of U1. R2 is connected to pin 5 of U1 and R1. One end of R1 is connected to pin 6 of U1. One end of C1 is connected to pin 5 of U1, and the other end of C1 is connected to pin 6 of U1. One end of R1 is connected to pin 6 of Q1. Pin 1 and pin 3 of Q1 are respectively connected to R6 and R7. The other ends of R6 and R7 are respectively connected to pin 8 and pin 11 of U1. Pin 2 of Q1 is connected to P. Pin 4 and pin 5 of Q1 are connected to LX1, R21 and C16. One end of C16 is connected to pin 9 of U1. R21 is connected to C14. C14 is connected to P and C15. C15 is connected to R22. R22 is connected to C17. One end of C17 is connected to pin 15 of U1. Pin 14 of U1 is connected between C17 and R22. One end of L1 is connected to pin 11 of U1, and the other end of L1 is connected between R22 and C17. Pin 16 of U1 is connected to R3, R4 and Q2. Pin 1 and pin 3 of Q2 are respectively connected to R9 and R8. The other ends of R9 and R8 are connected to pin 12 and pin 15 of U1. Pin 2 of Q2 is connected to one end of L1. LX2 is connected between pin 2 of Q2 and L1. Pin 5 of Q2 is connected to GND. The other end of R3 is connected to pin 17 of U1. The other end of R4 is connected to pin 18 of U1. Pin 19 of U1 is connected to C13, P- and pin 1 of BAT. C8 and C10 are also provided between P- and pin 19 of U1. The other end of C13 is connected to P-. GND pin 1 is connected between P- and C13. C25 and C26 are respectively connected to pin 20 and pin 22 of U1. RPSET is connected to pin 24 of U1. RBAT_NUM is connected to pin 22 of U1. Pin 26 of U1 is connected to R12 and C22. The other ends of R12 and C22 are connected to P-. Pin 1 and pin 2 of H1 are respectively connected to pin 26 and pin 22 of U1. Pin 23 and pin 25 of U1 are respectively connected to R33 and R32. The other ends of R33 and R32 are respectively connected to LED2 and LED1. The other ends of LED1 and LED2 are connected to P-.Pin 1, Pin 2, and Pin 3 of H2 are respectively connected to Pin 25, Pin 24, and Pin 23 of U1, and R1 is connected between Pin 1 of H2 and Pin 25 of U1.

[0006] Preferably, the variable resistance value of RBAT_NUM is 3.6k - 13k.

[0007] Preferably, the variable resistance value of RPSET is 3.6k - 13k.

[0008] Preferably, the battery is charged more quickly through the fast charging module, which supports 2 - 5 batteries. Compared with the prior art, the charging efficiency is increased by more than 80%. Based on the protocol chip technology, it is debugged and optimized to reasonably layout the protocol fast charging part of the circuit on the basis of the original battery pack protection board, and the charging power can reach 30 - 140W.

[0009] Preferably, when the battery is in low power or high power, the battery protection module performs protective charging, extends the battery life, increases the battery saturation, and greatly increases the usage time. By rectifying important components of the power supply characteristics, a trickle charging mode more suitable for the battery is debugged and optimized, so that when the battery power is low or high, it enters the small current charging mode to achieve the effect of protecting the battery.

[0010] Preferably, the charging mode adds a fast charging protocol output module, and through the buck - boost topology structure, the input voltage is amplified to 5 - 24V.

[0011] The beneficial effects of the present utility model are as follows: Through the battery protection module and the fast charging module, the charging speed is fast, the battery saturation ability is strong, the chargers between products are universal, the charging methods are diverse, the restrictions on users are low, and the charging time is short. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is the overall schematic diagram provided by the embodiment of the present utility model;

[0013] Figure 2 It is the schematic diagram of the structure of the battery protection module provided by the embodiment of the present utility model;

[0014] Figure 3 It is the schematic diagram of the structure of the fast charging module provided by the embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] To facilitate the understanding of the present utility model, the present utility model will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present utility model are shown in the drawings. However, the present utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided so that the disclosure of the present utility model can be understood more thoroughly and comprehensively.

[0016] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. On the contrary, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation. The terms "upper end", "lower end", "left side", "right side", "front end", "back end" and similar expressions used herein refer to the positional relationship in the accompanying drawings.

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this utility model belongs. The terms used in the description of this utility model herein are only for the purpose of describing specific embodiments and are not intended to limit this utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0018] The technical solutions of this patent will be further described in detail below in conjunction with specific embodiments.

[0019] Such as Figures 1 to 3As shown in the figure, an embodiment of the present utility model provides a fast charging circuit for an electric tool battery pack, which includes a battery protection module and a fast charging module. The battery protection module includes U2, R1, R2, R3, R4, R5, R6, R7, R12, R13, R15, R16, D1, D2, D3, MN1, Q1, NTC, RTS1, RTS2, Rsens, Rsens1, C1, C2, C3, C4, C5, C6, C8, B+, B-, P+, P- and C+. Pins 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 13, 14 and 15 of U2 are respectively connected with R1, R2, R3, R4, R5, R6, R7, C8, RTS1, RTS2, R12, R13, R16 and R15. The output end of B+ is connected with D1 and R2. The other end of D1 is connected with R1. The output end of B2 is connected with R3. The output end of B3 is connected with R4. The output end of B4 is connected with R5. The output end of B5 is connected with R6. The output end of P+ is connected with B+, Q1 and D3. The output end of C+ is connected with D2. The output end of D2 is connected with Q1 and R7. The output end of R7 is connected with R16. The output end of P- is connected with D3, R15 and MN1. The output end of B- is connected with Rsens, NTC and Rsens1. The output end of Rsens is connected with MN1 and R12. MN1 is also connected with R13. The other end of NTC is connected with RTS1 and RTS2. C1, C2, C3, C4, C5 and C6 are respectively connected between NTC and R1, R2, R3, R4, R5 and R6;

[0020] The fast charging module includes U1, USBC1, Q1, Q2, Q5, H1, H2, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R21, R22, R32, R33, C1, C2, C3, C4, C7, C8, C10, C12, C13, C14, C15, C16, C17, C22, C25, C26, L1, LED1, LED2. Pin 9 of USBC1 is connected to R5 and P. C3 and R10 are connected between pin 9 of USBC1 and P. R5 is in parallel with Q5. The other end of Q5 is connected to R2, P and C12. C7 and C4 are connected between Q5 and P. C12 is connected to pin 4 of U1. R2 is connected to pin 5 of U1 and R1. One end of R1 is connected to pin 6 of U1. One end of C1 is connected to pin 5 of U1, and the other end of C1 is connected to pin 6 of U1. One end of R1 is connected to pin 6 of Q1. Pin 1 and pin 3 of Q1 are respectively connected to R6 and R7. The other ends of R6 and R7 are respectively connected to pin 8 and pin 11 of U1. Pin 2 of Q1 is connected to P. Pin 4 and pin 5 of Q1 are connected to LX1, R21 and C16. One end of C16 is connected to pin 9 of U1. R21 is connected to C14. C14 is connected to P and C15. C15 is connected to R22. R22 is connected to C17. One end of C17 is connected to pin 15 of U1. Pin 14 of U1 is connected between C17 and R22. One end of L1 is connected to pin 11 of U1, and the other end of L1 is connected between R22 and C17. Pin 16 of U1 is connected to R3, R4 and Q2. Pin 1 and pin 3 of Q2 are respectively connected to R9 and R8. The other ends of R9 and R8 are connected to pin 12 and pin 15 of U1. Pin 2 of Q2 is connected to one end of L1. LX2 is connected between pin 2 of Q2 and L1. Pin 5 of Q2 is connected to GND. The other end of R3 is connected to pin 17 of U1. The other end of R4 is connected to pin 18 of U1. Pin 19 of U1 is connected to C13, P- and pin 1 of BAT. C8 and C10 are also provided between P- and pin 19 of U1. The other end of C13 is connected to P-. GND pin 1 is connected between P- and C13. C25 and C26 are respectively connected to pin 20 and pin 22 of U1. RPSET is connected to pin 24 of U1. RBAT_NUM is connected to pin 22 of U1. Pin 26 of U1 is connected to R12 and C22. The other ends of R12 and C22 are connected to P-. Pin 1 and pin 2 of H1 are respectively connected to pin 26 and pin 22 of U1. Pin 23 and pin 25 of U1 are respectively connected to R33 and R32. The other ends of R33 and R32 are respectively connected to LED2 and LED1. The other ends of LED1 and LED2 are connected to P-.Pin 1, Pin 2, and Pin 3 of H2 are respectively connected to Pin 25, Pin 24, and Pin 23 of U1, and R1 is connected between Pin 1 of H2 and Pin 25 of U1.

[0021] In the embodiment, the variable resistance value of RBAT_NUM is 3.6k - 13k.

[0022] In the embodiment, the variable resistance value of RPSET is 3.6k - 13k.

[0023] In the embodiment, the battery is charged more quickly through the fast charging module, which supports 2 - 5 batteries. Compared with the prior art, the charging efficiency is increased by more than 80%. Based on the protocol chip technology, it is debugged and optimized to reasonably layout the protocol fast charging part of the circuit on the basis of the original battery pack protection board, and the charging power can reach 30 - 140W.

[0024] In the embodiment, the battery is protected during charging when the battery is in low or high power through the battery protection module, which prolongs the battery life, increases the battery saturation, and increases the usage time to a greater extent. By rectifying the important components of the power supply characteristics, a trickle charging mode more suitable for the battery is debugged and optimized, so that when the battery power is low or high, it enters the small current charging mode to achieve the effect of protecting the battery.

[0025] In the embodiment, the charging mode adds a fast charging protocol output module, and through the buck-boost topology structure, the input voltage is amplified to 5 - 24V.

[0026] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Those of ordinary skill in the relevant technical fields can also make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention, and the patent protection scope of the present invention should be defined by the claims.

Claims

1. A fast charging circuit for a power tool battery pack, characterized in that: It includes a battery protection module and a fast charging module, wherein the battery protection module includes U2, a first resistor R1, a first resistor R2, a first resistor R3, a first resistor R4, a first resistor R5, a first resistor R6, a first resistor R7, a first resistor R12, R13, R15, R16, D1, D2, D3, MN1, Q1, NTC, RTS1, RTS2, Rsens, Rsens1, a first capacitor C1, a first capacitor C2, a first capacitor C3, a first capacitor C4, a capacitor C5, a capacitor C6, a first capacitor C8, B+, B-, P+, P- and C+, the pins 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 13, 14 and 15 of the U2 are respectively connected to the R1, the first resistor R2, the first resistor R3, the first resistor R4, the first resistor R5, the first resistor R6, the first resistor R7, the first capacitor C8, RTS1, RTS2, the first resistor R12, R13, R16 and R15, the output end of the B+ is connected to the D1 and the first resistor R2, the other end of the D1 is connected to the R1, and the output end of the B2 is connected to The output end of B3 is connected to the first resistor R4, the output end of B4 is connected to the first resistor R5, the output end of B5 is connected to the first resistor R6, the output end of P+ is connected to B+, Q1 and D3, the output end of C+ is connected to D2, the output end of D2 is connected to Q1 and the first resistor R7, the output end of the first resistor R7 is connected to R16, the output end of P- is connected to D3, R15 and MN1, the output end of B- is connected to The Rsens, the NTC and the Rsens1 are connected to the output end of the Rsens, the MN1 and the first resistor R12 are connected to the output end of the Rsens, the MN1 is also connected to the R13, the other end of the NTC is connected to the RTS1 and the RTS2, and the first capacitor C1, the first capacitor C2, the first capacitor C3, the first capacitor C4, the capacitor C5 and the capacitor C6 are respectively connected between the NTC and the R1, the first resistor R2, the first resistor R3, the first resistor R4, the first resistor R5 and the first resistor R6; The fast charging module includes U1, USBC1, Q1, Q2, Q5, H1, H2, a second resistor R1, a second resistor R2, a second resistor R3, a second resistor R4, a second resistor R5, a second resistor R6, a second resistor R7, R8, R9, R10, R11, R12, R21, R22, R32, R33, a second capacitor C1, a second capacitor C2, a second capacitor C3, a second capacitor C4, C7, a second capacitor C8, C10, C12, C13, C14, C15, C16, C17, C22, C25, C26, L1, LED1, and LED2. Pin 9 of the USBC1 is connected to the second resistor R5 and the P. The second capacitor C3 and the R10 are connected between pin 9 and the P, the second resistor R5 is connected in parallel with the Q5, the other end of the Q5 is connected to the second resistor R2, the P and the C12, the C7 and the second capacitor C4 are connected between the Q5 and the P, the C12 is connected to the pin 4 of the U1, the second resistor R2 is connected to the pin 5 of the U1 and the second resistor R1, one end of the second resistor R1 is connected to the pin 6 of the U1, one end of the second capacitor C1 is connected to the pin 5 of the U1, the other end of the second capacitor C1 is connected to the pin 6 of the U1, one end of the second resistor R1 is connected to the pin 6 of the Q1, and the Pin 1 and pin 3 of Q1 are connected to the second resistor R6 and the second resistor R7, respectively. The other ends of the second resistor R6 and the second resistor R7 are connected to pin 8 and pin 11 of U1, respectively. Pin 2 of Q1 is connected to P. Pin 4 and pin 5 of Q1 are connected to LX1, R21 and C16. One end of C16 is connected to pin 9 of U1. R21 is connected to C14. C14 is connected to P and C15. C15 is connected to R22. R22 is connected to C17. One end of C17 is connected to pin 15 of U1. Pin 14 of U1 is connected between C17 and R22. One end of L1 is connected to pin 11 of U1, the other end of L1 is connected between R22 and C17, pin 16 of U1 is connected to the second resistor R3, the second resistor R4 and Q2, pin 1 and pin 3 of Q2 are connected to R9 and R8 respectively, the other ends of R9 and R8 are connected to pin 12 and pin 15 of U1, pin 2 of Q2 is connected to one end of L1, LX2 is connected between pin 2 of Q2 and L1, pin 5 of Q2 is connected to GND, the other end of the second resistor R3 is connected to pin 17 of U1, the other end of the second resistor R4 is connected to pin 18 of U1,Pin 19 of U1 is connected to C13, P- and pin 1 of BAT, the second capacitor C8 and C10 are also arranged between P- and pin 19 of U1, the other end of C13 is connected to P-, pin 1 of GND is connected between P- and C13, C25 and C26 are respectively connected to pin 20 and pin 22 of U1, RPSET is connected to pin 24 of U1, RBAT_NUM is connected to pin 22 of U1, R12 and C22 are connected to pin 26 of U1, R12 and The other end of C22 is connected to P-, Pin 1 and Pin 2 of H1 are connected to Pin 26 and Pin 22 of U1 respectively, Pin 23 and Pin 25 of U1 are connected to R33 and R32 respectively, the other ends of R33 and R32 are connected to LED2 and LED1 respectively, the other ends of LED1 and LED2 are connected to P-, Pin 1, Pin 2 and Pin 3 of H2 are connected to Pin 25, Pin 24 and Pin 23 of U1 respectively, and the second resistor R1 is connected between Pin 1 of H2 and Pin 25 of U1. , 2. The fast charging circuit for a power tool battery pack according to claim 1, characterized in that: The variable resistance value of RBAT_NUM is 3.6k-13k.

3. The fast charging circuit of a power tool battery pack according to claim 2, characterized in that: The variable resistance value of RPSET is 3.6k-13k.

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