CN218482672U

CN218482672U - Lithium battery charging module

Info

Publication number: CN218482672U
Application number: CN202221661269.0U
Authority: CN
Inventors: 潘秋雄; 王利佳; 李锦就
Original assignee: Shenzhen Taigao Technology Co ltd
Current assignee: Shenzhen Taigao Technology Co ltd
Priority date: 2022-06-29
Filing date: 2022-06-29
Publication date: 2023-02-14
Anticipated expiration: 2032-06-29

Abstract

The utility model provides a lithium battery charging module, include: the device comprises a rectification module, a main control module, an output control module, a PFC power module, an LLC power module and a synchronous rectification module; the rectification module is respectively electrically connected with the main control module, the PFC power module and a power supply input end; the main control module is also electrically connected with the LLC power module and the output control module respectively; the output control module is electrically connected with the synchronous rectification module; the PFC power module comprises a first power tube, a second power tube, a third power tube and a fourth power tube; the main control module comprises a combined controller; the output control module includes: comparator, opto-coupler element and triode. The utility model discloses can reduce the volume, can improve charge efficiency and charging power simultaneously.

Description

Lithium battery charging module

Technical Field

The utility model belongs to the technical field of power supply circuit, especially, relate to a lithium battery charging module.

Background

Some lithium battery charging module circuits in the prior art have the defects of large size, difficulty in miniaturization, occupation of more space, inconvenience in carrying, low charging efficiency and low power.

SUMMERY OF THE UTILITY MODEL

The utility model provides a lithium battery charging module aims at solving current lithium battery charging module and has bulky, and charging efficiency is low, problem that power is low.

The utility model discloses a realize like this, provide a lithium battery charging module, include: the device comprises a rectification module, a main control module, an output control module, a PFC power module, an LLC power module and a synchronous rectification module;

the rectification module is respectively electrically connected with the main control module, the PFC power module and a power supply input end;

the main control module is also electrically connected with the LLC power module and the output control module respectively;

the output control module is electrically connected with the synchronous rectification module;

the PFC power module comprises a first power tube, a second power tube, a third power tube and a fourth power tube, the first power tube is respectively and electrically connected with the rectification module, the main control module and the second power tube, the second power tube is also respectively and electrically connected with the main control module and the LLC power module, the third power tube is connected with the first power tube in parallel, and the fourth power tube is connected with the second power tube in parallel; the first power tube, the second power tube, the third power tube and the fourth power tube are all gallium nitride transistors with a first preset specification;

the main control module comprises a combined controller, the combined controller is respectively and electrically connected with the rectification module, the PFC power module, the output control module and the LLC power module, and the combined controller is a power factor correction and resonance two-in-one chip;

the output control module includes: the synchronous rectification circuit comprises a comparator, an optocoupler element and a triode, wherein the comparator is respectively connected with the optocoupler element, the triode and the synchronous rectification module electrically, the optocoupler element is further connected with the master control module and the synchronous rectification module electrically, and the triode is further connected with the synchronous rectification module electrically.

Furthermore, the LLC power module includes a fifth power tube and a sixth power tube, where the fifth power tube is electrically connected to the main control module, the synchronous rectification module, the PFC power module, and the sixth power tube is also electrically connected to the main control module and the synchronous rectification module, respectively.

Furthermore, the fifth power transistor and the sixth power transistor are both gallium nitride transistors with a second predetermined specification.

Furthermore, the PFC power module further comprises a first inductor, a second inductor, a first diode and a second diode, wherein one end of the first inductor is electrically connected with the rectification module, the other end of the first inductor is respectively electrically connected with one end of the second inductor and the anode of the first diode, the other end of the second inductor is respectively electrically connected with the anode of the second diode, the first power tube and the second power tube, and the cathode of the first diode is electrically connected with the cathode of the second diode and the fifth power tube.

Furthermore, the synchronous rectification module comprises a transformer, a first switch tube, a second switch tube and a synchronous rectifier controller, wherein the primary input end of the transformer is electrically connected with the fifth power tube, the sixth power tube and the main control module respectively, the secondary output end of the transformer is electrically connected with the synchronous rectifier controller, the first switch tube and the second switch tube respectively, and the first switch tube and the second switch tube are electrically connected with the synchronous rectifier controller respectively.

Furthermore, the primary input end of the transformer is provided with a plurality of groups of coils.

Further, the output control module includes: the output control module further includes: the synchronous rectifier circuit comprises a first resistor R47, a second resistor R49, a third resistor R54, a fourth resistor R61, a fifth resistor R62, a sixth resistor R64, a third diode U7, a fourth diode U8 and an LED indicator light D12, wherein a comparator is further respectively electrically connected with the third resistor R54, the fourth resistor R61, the fifth resistor R62 and the sixth resistor R64, the sixth resistor R64 is electrically connected with a base of a triode, an emitter of the triode is respectively electrically connected with an anode of the third diode U7 and an anode of the fourth diode U8, a collector of the triode is electrically connected with the LED indicator light D12, the LED indicator light D12 is electrically connected with the synchronous rectifier module, a cathode of the third diode U7 is respectively electrically connected with the third resistor R54, the fourth resistor R61, the fifth resistor R62, the element is further electrically connected with the first resistor R47, the second resistor R49 and the fourth diode, a cathode of the third resistor R54 is electrically connected with the second resistor R49, and the synchronous rectifier module R47 and the synchronous rectifier module.

Furthermore, the main control module further comprises a signal enhancement element, the signal enhancement element is electrically connected with the combined controller, and the signal enhancement element is further electrically connected with the first power tube.

Furthermore, the rectifier module comprises a first rectifier bridge, a second rectifier bridge, a first common mode inductor, a capacitor, a second common mode inductor, a varistor, a thermistor and a fuse, wherein one end of the fuse is electrically connected with the negative pole of the power input end, the other end of the fuse is electrically connected with one end of the thermistor, the other end of the thermistor is electrically connected with the varistor, one end of the varistor is electrically connected with the positive pole of the power input end, the capacitor is connected with the first common mode inductor in parallel, the second common mode inductor is connected with the capacitor in parallel, the second common mode inductor is connected with the first rectifier bridge in parallel, the first rectifier bridge is electrically connected with the PFC power module, and the second rectifier bridge is connected with the first rectifier bridge in parallel.

The utility model discloses the beneficial effect who reaches: the PWM signal is sent through the main control module to control the switching frequency, power factor correction is achieved through a PFC power module formed by a first power tube, a second power tube, a third power tube and a fourth power tube, meanwhile, the EMI (electromagnetic interference) effect generated by a circuit is reduced through an LLC power module formed by the first power tube, the second power tube, the third power tube and the fourth power tube are all gallium nitride transistors with a first preset specification, meanwhile, the number of the power tubes of the LLC power module is multiple, power can be improved, and performance is better. And then the output ripple signals are collected by the synchronous rectification module to adjust the output frequency of PWM, so that the current phase and the voltage phase are consistent as much as possible, and the power factor of the PWM is close to 100% as much as possible. To obtain a higher power utilization. And finally, acquiring the output frequency through the output control module, providing a corresponding frequency signal for the main control module, and controlling the working frequency of the LLC power module through the main control module so as to reduce the EMI effect generated by the circuit. And the combined controller of the main control module is a TAE2017 chip, the PWM signal frequency section is higher, and the performance is better. Therefore, the volume is reduced, and meanwhile, the charging efficiency and the electric energy utilization rate of the lithium battery charging module are improved.

Drawings

Fig. 1 is a schematic block diagram of a lithium battery charging module provided in the present invention;

fig. 2 is a circuit diagram of a main control module provided by the present invention;

fig. 3 is a circuit diagram of a PFC power module provided by the present invention;

fig. 4 is a circuit diagram of an output control module provided by the present invention;

fig. 5 is a circuit diagram of an LLC power module provided by the present invention;

fig. 6 is a circuit diagram of a synchronous rectification module provided by the present invention;

fig. 7 is a circuit diagram of a rectifier module provided by the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Referring to fig. 1, fig. 1 is a schematic diagram of a lithium battery charging module according to the present invention.

This lithium battery charging module includes: the device comprises a rectification module 1, a main control module 2, an output control module 3, a PFC power module 4, an LLC power module 5 and a synchronous rectification module 6. The rectification module 1 is electrically connected with the main control module 2, the PFC power module 4 and the power input end respectively. The main control module 2 is further electrically connected to the LLC power module 5 and the output control module 3, respectively. The output control module 3 is electrically connected with the synchronous rectification module 6.

As shown in fig. 2, the main control module includes a combined controller U1, the combined controller U1 is electrically connected to the rectifying module, the PFC power module, the output control module, and the LLC power module 5, respectively, and the combined controller U1 is a TAE2017 chip. The PWM signal frequency section of the TAE2017 chip is higher, the performance is better, and the performance of the lithium battery charging module is further improved. The TAE2017 chip is a digital configurable LLC and PFC combined controller U1 for a high-efficiency resonant power supply.

In an embodiment of the present invention, the first power tube Q1, the second power tube Q2, the third power tube Q3 and the fourth power tube Q4 are gallium nitride transistors of a first predetermined specification. The gallium nitride transistor has small volume, and can obviously reduce the volume of the lithium battery charging module. The first predetermined specification gallium nitride transistor may be a TP44200NM gallium nitride transistor, a TP44X00SG gallium nitride transistor, or the like.

In the embodiment of the present invention, as shown in fig. 3, the PFC power module 4 includes a first power tube Q1, a second power tube Q2, a third power tube Q3 and a fourth power tube Q4, the first power tube Q1 respectively with the rectifier module 1, the main control module 2 and the second power tube Q2 is electrically connected, the second power tube Q2 further respectively with the main control module 2 and the sixth power tube Q6 is electrically connected. The third power tube Q3 is connected in parallel with the first power tube Q1, and the fourth power tube Q4 is connected in parallel with the second power tube Q2, so as to improve the power of the PFC power module 4. Specifically, a PLC power circuit (power factor correction circuit) of the lithium battery charging module is formed by the first power tube Q1, the second power tube Q2, the 7 th power tube Q7 and the fourth power tube Q4, and then power factor correction is realized. The power factor is made to be as close to 100% as possible (also called conversion efficiency, the closer the value is to 100%, the higher the efficiency is), and the THD is reduced and the higher electric energy utilization rate is obtained due to higher frequency and more synchronization.

In the embodiment of the present invention, the fifth power transistor Q5 and the sixth power transistor Q6 are both gallium nitride transistors with a second predetermined specification. The gallium nitride transistor has small volume, and can obviously reduce the volume of the lithium battery charging module. The second predetermined specification gallium nitride transistor may be a TP44200NM gallium nitride transistor, a TP44X00SG gallium nitride transistor, or the like. It should be noted that the gallium nitride transistor of the first predetermined specification and the gallium nitride transistor of the second predetermined specification may be the same, or may be different.

Specifically, the specific model of the first power tube Q1 is TP44X00SG. The 1 st, 2 nd, 3 th and 4 th pins of the first power tube Q1 are electrically connected with the 7 th, 8 th, 9 th, 10 th, 11 th, 12 th, 13 th, 14 th, 15 th, 16 th, 17 th, 18 th, 19 th, 20 th and 22 th pins of the first power tube. The 5 th Pin (PWM) of the first power transistor Q1 is electrically connected to the 6 th pin (OUT) of the signal enhancement element U2 in the main control module 2 through a resistor R7, a capacitor C2, and a resistor R8. Wherein, the resistor R7 is connected with the resistor R8 in series. The capacitor C2 is connected in parallel with the resistor R8. The 6 th (ZA) pin of the first power transistor Q1 is electrically connected to the ZA pin of the second power transistor Q2 through a resistor R9 and a parallel resistor R11, to the ZA pin of the third power transistor Q3 through a parallel resistor R41, and to the ZA pin of the fourth power transistor Q4 through a parallel resistor R43.

The specific model of the second power tube Q2 is TP44X00SG, and the 1 st, 2 nd, 3 rd and 4 th pins of the second power tube Q2 are all electrically connected with the 7 th, 8 th, 9 th, 10 th, 11 th, 12 th, 13 th, 14 th, 15 th, 16 th, 17 th, 18 th, 19 th, 20 th and 22 th pins of the second power tube Q2. The 5 th Pin (PWM) of the second power transistor Q2 is electrically connected to the 5 th Pin (PWM) of the first power transistor Q1 through a resistor R10 and a resistor R7, and is used for transmitting a PWM signal. The 6 th pin of the second power tube Q2 is electrically connected with the ZA pin of the third power tube Q3 after being connected with the resistor R41 through the resistor R11.

The specific models of the third power tubes Q3 are all TP44X00SG, and the 1 st, 2 nd, 3 th and 4 th pins of the third power tubes Q3 are electrically connected with the 7 th, 8 th, 9 th, 10 th, 11 th, 12 th, 13 th, 14 th, 15 th, 16 th, 17 th, 18 th, 19 th, 20 th and 22 th pins of the third power tubes Q3. The 5 th Pin (PWM) of the third power transistor Q3 is electrically connected to the 5 th Pin (PWM) of the first power transistor Q6 through the resistor R40 and the resistor R7, and is used for transmitting a PWM signal. The 6 th pin of the third power transistor Q3 is electrically connected to the fourth power transistor Q4 through a resistor R41 and a resistor R43.

The specific model of the fourth power tube Q4 is TP44X00SG, and the 1 st, 2 nd, 3 rd and 4 th pins of the fourth power tube Q4 are all electrically connected with the 7 th, 8 th, 9 th, 10 th, 11 th, 12 th, 13 th, 14 th, 15 th, 16 th, 17 th, 18 th, 19 th, 20 th and 22 th pins of the fourth power tube Q4. The 5 th Pin (PWM) of the fourth power transistor Q4 is electrically connected to the 5 th Pin (PWM) of the first power transistor Q6 through the resistor R42 and the resistor R7, and is configured to transmit a PWM signal.

As shown in fig. 4, the output control module 3 includes: comparator U9, opto-coupler element U4 and triode Q9, comparator U9 respectively with opto-coupler element U4 triode Q9 and synchronous rectifier module electricity is connected, opto-coupler element U4 still with host system and synchronous rectifier module electricity is connected, triode Q9 still with synchronous rectifier module electricity is connected. Specifically, the charging process is realized through the matching control of the comparator U9, the optocoupler U4 and the triode Q9.

Specifically, the PWM signal is sent by the main control module 2 to control the switching frequency, the power factor correction is realized by the PFC power module 4, and the LLC power module 5 composed of the fifth power tube Q5 and the sixth power tube Q6 reduces the EMI (electromagnetic interference) effect generated by the circuit, and the first power tube Q1, the second power tube Q2, the third power tube Q3, and the fourth power tube Q4 are all gallium nitride transistors of a first predetermined specification, and at the same time, the LLC power module 5 has a plurality of power tubes, which can improve the power and has better performance. And then the synchronous rectification module 6 collects output ripple signals to adjust the output frequency of PWM, so that the current phase and the voltage phase are consistent as much as possible, and the power factor of the PWM is close to 100% as much as possible. To obtain a higher power utilization. And finally, the output control module 3 acquires the output frequency and provides a corresponding frequency signal for the main control module 2, so that the charging process is realized. And the main control module 2 controls the working frequency of the LLC power module 5 so as to reduce the EMI effect generated by the circuit. And the combined controller U1 of the main control module is a power factor correction and resonance two-in-one chip (the model can be TAE 2017), and the PWM signal frequency section of the TAE2017 chip is higher, so that the performance is better. Therefore, the size is reduced, and meanwhile, the charging efficiency and the electric energy utilization rate of the lithium battery charging module are improved, and the charging power is improved.

In the embodiment of the present invention, as shown in fig. 3, the PFC power module 4 further includes a first inductor L1, a second inductor L2, a first diode D1, and a second diode D2, wherein one end of the first inductor L1 is electrically connected to the rectifier module 1, the other end of the first inductor L1 is electrically connected to one end of the second inductor L2 and the anode of the first diode D1, the other end of the second inductor L2 is electrically connected to the anode of the second diode D2, the first power tube Q1 and the second power tube Q2, the cathode of the first diode D1 is electrically connected to the cathode of the second diode D2 and the LLC power module 5. The parameters of the second inductor L2 are: the lowest input voltage is 100VAC: 22V10A190uH. Specifically, the 21 st pin (DRAIN) of the first power tube Q1 and the 21 st pin (DRAIN) of the second power tube Q2 are both electrically connected to the connection line between the second inductor L2 and the second diode D2.

As shown in fig. 5, the LLC power module 5 includes a fifth power tube Q5 and a sixth power tube Q6, the fifth power tube Q5 is electrically connected to the main control module 2, the synchronous rectification module 6, the PFC power module 4, and the sixth power tube Q6, respectively, and the sixth power tube Q6 is also electrically connected to the main control module 2 and the synchronous rectification module 6, respectively. Specifically, the fifth power tube Q5 and the sixth power tube Q6 form an LLC power circuit (resonant circuit) of the lithium battery charging module, thereby reducing EMI (electromagnetic interference) generated by the circuit.

Specifically, the specific model of the fifth power tube Q5 is TP44100SG, wherein the TP44100SG has an internal resistance of 90m Ω, and the maximum current can reach 13.5

A. Pins

1, 2, 3, 4, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22 of the fifth power tube Q5 are electrically connected. The 11 th pin (NC 11) of the fifth power transistor Q5 is electrically connected to the 21 st pin (DRAIN) of the sixth power transistor Q6. The 5 th pin of the fifth power tube Q5 is connected in parallel with the capacitor C6 through the resistor R15, then connected in series with the resistor R14, then connected in parallel with the diode D7, and finally electrically connected with the 9 th pin (GATEHS) of the combined controller U1. The zener diode DZ2 is connected in parallel with the 5 th and 6 th pins of the fifth power transistor Q5. The 11 th pin of the fifth power tube Q5 is also electrically connected to the primary input terminal of the transformer T1 of the synchronous rectification module 6.

The specific model of the sixth power tube Q6 is TP44100SG, and pins 1, 2, 3, 4, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 and 22 of the sixth power tube Q6 are electrically connected. The 5 th pin of the sixth power tube Q6 is connected in parallel with the capacitor C7 through the resistor R16, then connected in series with the resistor R17, then connected in parallel with the diode D9, and finally electrically connected with the 9 th pin (GATEHS) of the combined controller U1. The zener diode DZ3 is connected in parallel with the 5 th pin and the 6 th pin of the sixth power transistor Q6. The 21 st pin (DRAIN) of the sixth power transistor Q6 is also electrically connected to the primary input terminal of the transformer T1 of the synchronous rectification module 6.

In the embodiment of the present invention, as shown in fig. 6, the synchronous rectification module 6 includes a transformer T1, a first switch tube Q7, a second switch tube Q8 and a synchronous rectifier controller U3, the primary input end of the transformer T1 respectively with a fifth power tube Q5, a second power tube Q2 and the main control module is electrically connected, the secondary output end of the transformer T1 respectively with the synchronous rectifier controller U3, the first switch tube Q7 and the second switch tube Q8 is electrically connected, the first switch tube Q7 and the second switch tube Q8 respectively with the synchronous rectifier controller U3 is electrically connected. The primary input end of the transformer T1 is provided with a plurality of groups of coils. Wherein, the transformer T1 is a 500W transformer.

Specifically, the specific model of the transformer T1 is T-ATQ27 (5 + 0), and a1 st pin of the first group of coils at the primary input end of the transformer T1 is electrically connected to an 11 th pin of the fifth power tube Q5 and a 21 st pin of the sixth power tube Q6, respectively. And the 2 nd pin of the first group of coils at the primary input end of the transformer T1 is electrically connected with the 14 th pin of the combined controller U1 after being connected with a resistor R19 in series through a resistor R20. The resistor R20 and the resistor R19 are also connected in parallel with the capacitor C9. The second set of windings (pin 4) at the primary input of the transformer T1 is electrically connected to pin 13 of the combination controller U1. The second set of windings (pin 5) at the primary input of the transformer T1 is electrically connected to PGND. The pin A of the secondary output end of the transformer T1 is electrically connected with the drain electrode of the first switch tube Q7. And a pin B of the secondary output end of the transformer T1 is electrically connected with a pin 7 of the synchronous rectifier controller U3. And a pin D of the secondary output end of the transformer T1 is electrically connected with a drain electrode of the second switching tube Q8. The pin A of the secondary output end of the transformer T1 is also electrically connected with the pin 3 of the synchronous rectifier controller U3. The pin D of the secondary output end of the transformer T1 is also electrically connected with the pin 6 of the synchronous rectifier controller U3.

The source of the first switch Q7 is electrically connected to the drain of the first switch Q7 through a capacitor C22 and a resistor R28 in series, and the source of the first switch Q7 is also electrically connected to

pins

4 and 5 of the synchronous rectifier controller U3. The grid electrode of the first switch tube Q7 is electrically connected with the 1 st pin of the synchronous rectifier controller U3. The source electrode of the second switch tube Q8 is electrically connected to the drain electrode of the second switch tube Q8 after being connected in parallel with the resistor R29 through the capacitor C23. The gate of the second switching tube Q8 is electrically connected to the 8 th pin of the synchronous rectifier controller U3.

In the embodiment of the present invention, as shown in fig. 6, the output control module 3 includes: the synchronous rectifier circuit comprises a first resistor R47, a second resistor R49, a third resistor R54, a fourth resistor R61, a fifth resistor R62, a sixth resistor R64, a third diode U7, a fourth diode U8 and an LED indicator light D12, wherein a comparator U9 is further respectively and electrically connected with the third resistor R54, the fourth resistor R61, the fifth resistor R62 and the sixth resistor R64, the sixth resistor R64 is electrically connected with a base of a triode Q9, an emitter of the triode Q9 is respectively and electrically connected with an anode of the third diode U7 and an anode of the fourth diode U8, a collector of the triode Q9 is electrically connected with the LED indicator light D12, the LED indicator light D12 is electrically connected with the synchronous rectifier module, a cathode of the third diode U7 is respectively and electrically connected with the third resistor R54, the fourth resistor R61 and the fifth resistor R62, the synchronous rectifier element is further and electrically connected with the first resistor R47, the second resistor R49, the cathode of the third diode R54, the fourth resistor R61 and the synchronous rectifier module R47, and the synchronous rectifier module R49.

Specifically, in fig. 6, the comparator U9 is split into U9A and U9B, the optical coupling element U4 is split into U4A and U4B, the resistor R49, the comparator U9, the capacitor C47, and the resistor R47 provide operating voltages for the comparator U9 and the peripheral circuit, and the third diode U7 provides a reference voltage for the comparator U9, and the reference voltage is divided by the resistor R54 and the resistor R62 to the 2 nd pin and the 5 th pin of the comparator U9. When the lithium battery charging module is normally charged, the resistor R61 has a voltage of about 0.15V-0.18V, the voltage passes through the resistor R61 to the 3 rd pin of the comparator, and the 1 st pin of the comparator U9 outputs a high voltage. A resistor R64 in the circuit drives a triode Q9 to be conducted, and an LED indicating lamp D12 indicates electric quantity. And the other path of the current is transmitted to a pin 6 and a pin 7 of a comparator U9, so that the optocoupler U4 is turned off, and the lithium battery charging module enters a constant current charging stage. When the voltage of the battery rises to about 42V, the lithium battery charging module enters a constant voltage charging stage, the output voltage is maintained at about 42V, the lithium battery charging module enters the constant voltage charging stage, and the current is gradually reduced. When the charging current is reduced to 200-300 mA, the voltage on the resistor R61 is reduced, the voltage of the No. 3 pin of the comparator U9 is lower than the No. 2 pin of the comparator U9, the No. 1 pin of the comparator U9 outputs low voltage, the triode Q9 is turned off, and the LED indicator lamp D12 is turned off. Meanwhile, the 7 th pin of the comparator U9 outputs high voltage, and the voltage enables the optocoupler U4 to be conducted all the way. And the other path of the fourth diode U8 is connected to the feedback circuit, so that the voltage is reduced, the lithium battery charging module enters a trickle charging stage, and after the charging current is gradually reduced to 10mA, the charging is finished, and the charging process is realized. And then improve lithium battery charging module's charge efficiency, electric energy utilization and rate, still reduce lithium battery charging module's heat. The charging performance of the lithium battery charging module is improved.

In the embodiment of the present invention, as shown in fig. 3, the main control module 2 further includes a signal enhancement element U2, the signal enhancement element U2 is electrically connected to the combined controller U1, and the signal enhancement element U2 is further electrically connected to the first power tube Q1. The PWM signal is sent by the combined controller U1, and the signal enhancement element U2 enhances the PWM signal, so that the switching frequency is controlled.

In the embodiment of the present invention, as shown in fig. 7, the rectifier module 1 includes a first rectifier bridge BD1, a second rectifier bridge BD2, a first common mode inductance FL1, a capacitance CX1, a second common mode inductance FL2, a varistor RV1, a fuse NTC1, and a fuse F1, one end of the fuse F1 is electrically connected to the negative electrode ACN of the power input end, the other end of the fuse F1 is electrically connected to one end of the fuse NTC1, the other end of the fuse NTC1 is electrically connected to the varistor RV1, one end of the varistor RV1 is electrically connected to the positive electrode ACL of the power input end, the capacitance CX1 is connected to the first common mode inductance FL1 in parallel, the second common mode inductance FL2 is connected to the capacitance CX1 in parallel, the second common mode inductance FL2 is connected to the first rectifier bridge BD1 in parallel, the first rectifier bridge BD1 is electrically connected to the PFC power module 4, and the second rectifier bridge BD2 is connected to the first rectifier bridge BD1 in parallel. The first common mode inductor FL1 may be T18 × 10 × 7, which is a device for eliminating interference noise, and the input or output of the common mode inductor is filtered to obtain pure dc power. The circuit for filtering out the frequency points of the specific frequency or the frequencies except the frequency points is a filter, and the function of the circuit is to obtain the specific frequency or eliminate the specific frequency. A specific model of the second common-mode inductance FL2 may be T10 x 6 x 5. Specifically, the power supply is converted into a stable power supply input signal through the rectifier module 1, so that the power supply stability of the whole circuit is ensured.

In the embodiment of the present invention, the signal enhancement element U2 is provided with a PWM signal through the combination controller U1, and the signal enhancement element U2 is PThe WM signal is enhanced to control the switching frequency, meanwhile, the output ripple information of the synchronous rectifier controller U3 and the optocoupler element U4 at the secondary output end of the transformer T1 is collected, and the PWM frequency signal is adjusted to ensure that the current phase and the voltage phase are consistent as much as possible, so that the power factor is close to 100% as much as possible (also called conversion efficiency, the closer the value is to 100%, the higher the efficiency is), and the THD is reduced due to higher and more synchronous frequency, and the higher electric energy utilization rate is obtained; after the third diode U5 collects the output frequency of the transformer T1, the work of the optical coupling element U4 is controlled, the optical coupling element U4 is made to provide a corresponding frequency signal for the combined controller U1, the working frequency of the fifth power tube Q5 and the sixth power tube Q6 is adjusted after the combined controller U1 receives the signal, the charging process is realized, and the EMI effect generated by the circuit is reduced, when the combined controller U1 controls the fifth power tube Q5 and the sixth power tube Q6 to work, thereby controlling the frequency of the main side of the transformer T1, and outputting by the auxiliary side of the transformer T1, the first switch tube Q7 and the second switch tube Q8 perform switching rectification and output, thereby realizing the advantages of high efficiency, high power density and the like. Meanwhile, gallium nitride transistors are used as power transistors (the first power transistor Q1, the second power transistor Q2, the third power transistor Q3, the fourth power transistor Q4, the fifth power transistor Q5, and the sixth power transistor Q6 are all predetermined gallium nitride transistors). The PFC power module 4 is provided with four gallium nitride transistors, and the LLC power module 5 is provided with 2 gallium nitride transistors, so that the power of the PFC power module 4 and the LLC power module 5 can be improved. The alternating current/direct current (AC/DC) conversion of the gallium nitride charger is controlled by the main control circuit, the performance is better, the volume of the gallium nitride transistor is very small, and the volume of a lithium battery charging module can be obviously reduced. The efficiency of gallium nitride products on the market is about 90% -93%, the lithium battery charging module can reach 95.5%, and the volume is reduced to 70 × 46 × 31.5mm ³ The power density is more than 2W/CC, and the power is 500W. And the combined controller U1 of the main control module is a TAE2017 chip, the PWM signal frequency section of the TAE2017 chip is higher, and the performance is better. And then improve lithium battery charging module's charge efficiency, electric energy utilization rate, improve charging power and reduce lithium battery charging module's volume.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A lithium battery charging module, comprising: the device comprises a rectification module, a main control module, an output control module, a PFC power module, an LLC power module and a synchronous rectification module;

the output control module includes: the synchronous rectifier module comprises a comparator, an optocoupler element and a triode, wherein the comparator is respectively connected with the optocoupler element, the triode and the synchronous rectifier module electrically, the optocoupler element is further connected with the main control module and the synchronous rectifier module electrically, and the triode is further connected with the synchronous rectifier module electrically.

2. The li battery charging module of claim 1, wherein the LLC power module includes a fifth power transistor and a sixth power transistor, the fifth power transistor is electrically connected to the main control module, the synchronous rectification module, the PFC power module, and the sixth power transistor, respectively, and the sixth power transistor is further electrically connected to the main control module and the synchronous rectification module, respectively.

3. The lithium battery charging module of claim 2, wherein the fifth power transistor and the sixth power transistor are gallium nitride transistors of a second predetermined specification.

4. The lithium battery charging module according to claim 2, wherein the PFC power module further comprises a first inductor, a second inductor, a first diode, and a second diode, one end of the first inductor is electrically connected to the rectifying module, the other end of the first inductor is electrically connected to one end of the second inductor and the anode of the first diode, respectively, the other end of the second inductor is electrically connected to the anode of the second diode, the first power tube, and the second power tube, respectively, and the cathode of the first diode is electrically connected to the cathode of the second diode and the fifth power tube.

5. The lithium battery charging module of claim 2, wherein the synchronous rectification module comprises a transformer, a first switch tube, a second switch tube and a synchronous rectifier controller, a primary input end of the transformer is electrically connected to the fifth power tube, the sixth power tube and the main control module, a secondary output end of the transformer is electrically connected to the synchronous rectifier controller, the first switch tube and the second switch tube, and the first switch tube and the second switch tube are electrically connected to the synchronous rectifier controller.

6. A lithium battery charging module as claimed in claim 5, characterized in that the primary input of the transformer is provided with a plurality of sets of coils.

7. The lithium battery charging module of claim 1, wherein the output control module comprises: the output control module further includes: the synchronous rectifier circuit comprises a first resistor R47, a second resistor R49, a third resistor R54, a fourth resistor R61, a fifth resistor R62, a sixth resistor R64, a third diode U7, a fourth diode U8 and an LED indicator light D12, wherein the comparator is further respectively electrically connected with the third resistor R54, the fourth resistor R61, the fifth resistor R62 and the sixth resistor R64, the sixth resistor R64 is electrically connected with the base electrode of the triode, the emitter electrode of the triode is respectively electrically connected with the anode of the third diode U7 and the anode of the fourth diode U8, the collector electrode of the triode is electrically connected with the LED indicator light D12, the LED indicator light D12 is electrically connected with the synchronous rectifier module, the cathode of the third diode U7 is respectively electrically connected with the third resistor R54, the fourth resistor R61 and the fifth resistor R62, the optocoupler element is further electrically connected with the cathodes of the first resistor R47, the second resistor R49 and the fourth diode, the third resistor R54 is electrically connected with the synchronous rectifier module, the synchronous rectifier module and the synchronous rectifier module R47, and the synchronous rectifier module R49 are electrically connected with the optocoupler resistor R47 and the synchronous rectifier module.

8. The lithium battery charging module of claim 1, wherein the main control module further comprises a signal enhancement element, the signal enhancement element being electrically connected to the combination controller, the signal enhancement element being further electrically connected to the first power transistor.

9. The lithium battery charging module of claim 1, wherein the rectifying module comprises a first rectifying bridge, a second rectifying bridge, a first common mode inductor, a capacitor, a second common mode inductor, a voltage dependent resistor, a thermistor, and a fuse, wherein one end of the fuse is electrically connected to a negative electrode of a power input terminal, the other end of the fuse is electrically connected to one end of the thermistor, the other end of the thermistor is electrically connected to the voltage dependent resistor, one end of the voltage dependent resistor is electrically connected to a positive electrode of the power input terminal, the capacitor is connected in parallel to the first common mode inductor, the second common mode inductor is connected in parallel to the capacitor, the second common mode inductor is connected in parallel to the first rectifying bridge, the first rectifying bridge is electrically connected to the PFC power module, and the second rectifying bridge is connected in parallel to the first rectifying bridge.