A lithium battery protection board activation circuit

Abstract

This utility model discloses an activation circuit for a lithium battery protection board, including a transformer T1 for converting 220V AC power to 28V; a tripler rectifier circuit connected to the output terminal of transformer T1 for converting the 28V AC power output by transformer T1 into DC voltage; a high-voltage stabilizer circuit connected to the tripler rectifier circuit for converting the high-voltage DC power input to the tripler rectifier circuit into the required output voltage; and a voltage indicator circuit connected to the high-voltage stabilizer circuit for indicating the voltage level of the high-voltage stabilizer circuit. The tripler rectifier design enables miniaturization, the three-level voltage output design is compatible with mainstream protection board specifications, and the three-level LED voltage indicator enhances operational visibility.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, specifically to an activation circuit for a lithium battery protection board. Background Technology

[0002] For lithium battery packs with protection boards, most manufacturers require a charger to be connected to the battery output terminal to activate the protection board after assembly. Taking common 16-cell (nominal 48V, maximum 58.4V), 20-cell (nominal 60V, maximum 73V), and 24-cell (nominal 72V, maximum 87.6V) lithium iron phosphate batteries as examples, the current activation methods for lithium battery protection boards are as follows:

[0003] 1. Activation requires specialized equipment;

[0004] 2. The activation tool has a single output voltage and cannot be adapted to protection boards of different specifications;

[0005] 3. Lacks intuitive voltage indication function.

[0006] To address this, an activation circuit for a lithium battery protection board is proposed. Summary of the Invention

[0007] The purpose of this invention is to provide an activation circuit for a lithium battery protection board to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a lithium battery protection board activation circuit, including a transformer T1 for converting 220V AC power to 28V;

[0009] The tripler rectifier circuit is connected to the output terminal of transformer T1 and is used to convert the 28V AC output from transformer T1 into DC voltage.

[0010] The high-voltage stabilizer circuit, connected to the tripler rectifier circuit, is used to convert the high-voltage DC input to the tripler rectifier circuit into the required output voltage.

[0011] The voltage indicator circuit, connected to the high-voltage stabilizer circuit, is used to indicate the voltage level of the high-voltage stabilizer circuit.

[0012] Preferably, the tripler rectifier circuit includes a capacitor C1, one end of which is connected to one output terminal of the transformer T1, and the other end of which is connected to one end of the rectifier diode D1, one end of the rectifier diode D2, and one end of the capacitor C3. The other end of the rectifier diode D1 is connected to one end of the capacitor C2 and to the other output terminal of the transformer T1.

[0013] Preferably, the other end of capacitor C2 is connected to the other end of rectifier diode D2, the other end of capacitor C3 is connected to one end of rectifier diode D3 and one end of capacitor C4, and the other end of rectifier diode D3 is connected to the other end of capacitor C2.

[0014] Preferably, the high voltage stabilizer circuit includes a high voltage regulator IC1, the IN terminal of the high voltage stabilizer IC1 is connected to one end of capacitor C4 and the other end of capacitor C3, and a resistor R1 is connected between the OUT terminal and the ADJ terminal of the high voltage stabilizer IC1.

[0015] Preferably, one end of resistor R1 is connected to a three-position selector switch and one end of resistor R4, the other end of resistor R4 is connected to one end of resistor R3, the other end of resistor R3 is connected to one end of resistor R2, the second position of the three-position selector switch is connected between resistor R3 and resistor R4, and the third position of the three-position selector switch is connected between resistor R3 and resistor R2.

[0016] Preferably, the voltage indication circuit includes LED1, LED2 and LED3, and one end of LED1, LED2 and LED3 is connected to the OUT terminal of the high voltage stabilizer IC1.

[0017] Preferably, the other ends of LED1, LED2 and LED3 are respectively connected to one end of resistor R5, resistor R6 and resistor R7, and the other ends of resistor R5, resistor R6 and resistor R7 are respectively connected to Zener diodes ZD1, Zener diode ZD2 and Zener diode ZD3.

[0018] Compared with the prior art, the advantages of this utility model are: it adopts triple voltage rectification, which can achieve miniaturization; the three-level voltage output design can be adapted to mainstream protection board specifications; and the three-level LED voltage indication increases the visualization of operation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0021] Please see Figure 1This utility model provides a technical solution: a lithium battery protection board activation circuit, including a transformer T1 for transforming 220V AC power into 28V; a tripler rectifier circuit connected to the output terminal of the transformer T1 for converting the 28V AC power output by the transformer T1 into DC voltage; a high-voltage stabilizer circuit connected to the tripler rectifier circuit for converting the high-voltage DC power input to the tripler rectifier circuit into the required output voltage; and a voltage indicator circuit connected to the high-voltage stabilizer circuit for indicating the voltage level of the high-voltage stabilizer circuit output voltage.

[0022] like Figure 1 As shown: The tripler rectifier circuit includes capacitor C1. One end of capacitor C1 is connected to one output terminal of transformer T1. The other end of capacitor C1 is connected to one end of rectifier diode D1, one end of rectifier diode D2, and one end of capacitor C3. The other end of rectifier diode D1 is connected to one end of capacitor C2 and connected to the other output terminal of transformer T1. The other end of capacitor C2 is connected to the other end of rectifier diode D2. The other end of capacitor C3 is connected to one end of rectifier diode D3 and one end of capacitor C4. The other end of rectifier diode D3 is connected to the other end of capacitor C2.

[0023] like Figure 1 As shown: The high-voltage stabilizer circuit includes a high-voltage regulator IC1. The IN terminal of the high-voltage stabilizer IC1 is connected to one end of capacitor C4 and the other end of capacitor C3. A resistor R1 is connected between the OUT terminal and the ADJ terminal of the high-voltage stabilizer IC1. One end of the resistor R1 is connected to a three-position selector switch and one end of resistor R4. The other end of the resistor R4 is connected to one end of resistor R3. The other end of resistor R3 is connected to one end of resistor R2. The second position terminal of the three-position selector switch is connected between resistors R3 and R4, and the third position terminal of the three-position selector switch is connected between resistors R3 and R2.

[0024] like Figure 1 As shown: The voltage indication circuit includes LED1, LED2, and LED3. One end of each LED is connected to the OUT terminal of the high-voltage stabilizer IC1. The other ends of each LED are connected to one end of resistors R5, R6, and R7, respectively. The other ends of resistors R5, R6, and R7 are connected to Zener diodes ZD1, ZD2, and ZD3, respectively.

[0025] Working principle: Transformer T1 converts 220V AC to 28V AC. After passing through a tripler rectifier circuit, the voltage at capacitor C4 becomes three times the peak voltage (3√2*28V, ≈117V), which is then input to the IN terminal of the high-voltage regulator IC1. The voltage at the output terminal OUT is converted into the required output voltage through different combinations of resistors R1 to R4. The formula for the output voltage is:

[0026]

[0027] By connecting different resistors through a three-position switch, different voltages can be output. The three LEDs will break down the corresponding ZD voltage regulator according to the different output voltages, thereby lighting up the corresponding LEDs to indicate the corresponding output voltage and intuitively display the output voltage level.

[0028] Based on the formula calculation, we can select R1 = 680Ω, R2 = 30KΩ, R3 = R4 = 8.2KΩ, corresponding to voltage levels 1 (86V), 2 (72V), and 3 (56V). We select ZD1 = 1N4761 (75V), ZD2 = 1N4759 (62V), and ZD3 = 1N4757 (51V). When set to level 1, ZD1 to ZD3 will break down simultaneously, and all three indicator lights will light up. When set to level 2, ZD2 to ZD3 will break down, and LED2 to LED3 will light up. When set to level 3, ZD3 will break down, and LED3 will light up.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An activation circuit for a lithium battery protection board, characterized in that: This includes transformer T1, which converts 220V AC power to 28V; The tripler rectifier circuit is connected to the output terminal of transformer T1 and is used to convert the 28V AC output from transformer T1 into DC voltage. The high-voltage stabilizer circuit, connected to the tripler rectifier circuit, is used to convert the high-voltage DC input to the tripler rectifier circuit into the required output voltage. The voltage indicator circuit, connected to the high-voltage stabilizer circuit, is used to indicate the voltage level of the high-voltage stabilizer circuit.

2. The activation circuit for a lithium battery protection board according to claim 1, characterized in that: The tripler rectifier circuit includes a capacitor C1. One end of the capacitor C1 is connected to one output terminal of the transformer T1. The other end of the capacitor C1 is connected to one end of the rectifier diode D1, one end of the rectifier diode D2, and one end of the capacitor C3. The other end of the rectifier diode D1 is connected to one end of the capacitor C2 and to the other output terminal of the transformer T1.

3. The activation circuit for a lithium battery protection board according to claim 2, characterized in that: The other end of capacitor C2 is connected to the other end of rectifier diode D2. The other end of capacitor C3 is connected to one end of rectifier diode D3 and one end of capacitor C4. The other end of rectifier diode D3 is connected to the other end of capacitor C2.

4. The activation circuit for a lithium battery protection board according to claim 3, characterized in that: The high voltage stabilizer circuit includes a high voltage regulator IC1. The IN terminal of the high voltage stabilizer IC1 is connected to one end of capacitor C4 and the other end of capacitor C3. A resistor R1 is connected between the OUT terminal and the ADJ terminal of the high voltage stabilizer IC1.

5. The activation circuit for a lithium battery protection board according to claim 4, characterized in that: One end of resistor R1 is connected to a three-position selector switch and one end of resistor R4. The other end of resistor R4 is connected to one end of resistor R3. The other end of resistor R3 is connected to one end of resistor R2. The second position of the three-position selector switch is connected between resistor R3 and resistor R4. The third position of the three-position selector switch is connected between resistor R3 and resistor R2.

6. The activation circuit for a lithium battery protection board according to claim 4, characterized in that: The voltage indication circuit includes LED1, LED2 and LED3, one end of which is connected to the OUT terminal of the high voltage stabilizer IC1.

7. The activation circuit for a lithium battery protection board according to claim 6, characterized in that: The other ends of LED1, LED2 and LED3 are respectively connected to one end of resistor R5, resistor R6 and resistor R7, and the other ends of resistor R5, resistor R6 and resistor R7 are respectively connected to Zener diodes ZD1, Zener diode ZD2 and Zener diode ZD3.

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