CN207853536U - A kind of lithium battery quick-charging circuit - Google Patents
A kind of lithium battery quick-charging circuit Download PDFInfo
- Publication number
- CN207853536U CN207853536U CN201820270745.3U CN201820270745U CN207853536U CN 207853536 U CN207853536 U CN 207853536U CN 201820270745 U CN201820270745 U CN 201820270745U CN 207853536 U CN207853536 U CN 207853536U
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- lithium battery
- charging circuit
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Abstract
The utility model is related to a kind of lithium battery quick-charging circuit, which includes：It is connected to the power module of the primary side of transformer, it is connected to the charge control module at transformer secondary output end, charge control module is connected to lithium battery, charge control module includes synchronous rectification module, and synchronous rectification module includes biasing circuit module, power MOSFET module, voltage comparison module and recommending output mode module；The drain voltage V of power MOSFET moduleD, source voltage VSPass through a port signal processing module input voltage comparison module respectively, the secondary end of transformer provides voltage for biasing circuit module, the reference voltage input voltage comparison module that biasing circuit module provides, voltage comparison module outputs signal to recommending output mode module, recommending output mode module output signal to power MOSFET module.Implement the utility model, a kind of charging circuit for reducing cost while lithium battery quick charge transfer efficiency capable of being improved can be obtained.
Description
【Technical field】
The utility model is related to field of power management more particularly to a kind of lithium battery quick-charging circuits.
【Background technology】
Lithium battery rapid nitriding was rapidly developed at nearly 2 years, and traditional lithium battery charging technique charging current is all
In 2A hereinafter, traditional lithium battery charging technique charging scheme is as shown in Figure 1, the charging current Is of lithium battery passes through two poles
Pipe carries out rectification, since there are one pressure drop Vd (Vd=0.4V~0.6V) in forward conduction for rectifier diode, in two pole of rectification
With regard to power loss Pw, Pw=Is*Vd on pipe, when charging current increases to 3~5A, power attenuation will be very big, and meeting
Cause wiring board to generate heat, influences the service life of product.
In this regard, existing design is improved, in the design of Switching Power Supply, it will usually using extremely low special of on state resistance
The synchronous rectification of rectifier diode is substituted with power MOSFET (Metal-Oxide Semiconductor field-effect transistor), it is real
Existing method is as shown in Figure 2.In this scenario, the conducting resistance of MOSFET is down to tens milliohms, therefore can greatly reduce output end
Power attenuation, to improve power supply conversion efficiency, leading market is the products such as the IR1168 of IR companies, this scheme at present
The disadvantage is that wiring board is complicated, synchronous rectification IC need to use proprietary manufacturing process, expensive.
Therefore, there is an urgent need for a kind of charging electricity that can be reduced cost while can improve lithium battery quick charge transfer efficiency
Road.
【Utility model content】
Cost can be reduced the technical problem to be solved by the utility model is to provide one kind while can improve lithium battery
The charging circuit of quick charge transfer efficiency.The utility model provides a kind of lithium battery quick-charging circuit, including：It is connected to change
The power module of the primary side of depressor, is connected to the charge control module at transformer secondary output end, and charge control module is connected to lithium
Battery, the charge control module include synchronous rectification module, and the synchronous rectification module includes biasing circuit module, power
MOSFET modules, voltage comparison module and recommending output mode module；Drain voltage VD, the source voltage of the power MOSFET module
For VS respectively by a port signal processing module input voltage comparison module, the secondary end of transformer is the biasing circuit mould
Block provides voltage, and the reference voltage that the biasing circuit module provides inputs the voltage comparison module, and the voltage compares mould
Block outputs signal to recommending output mode module, the recommending output mode module output signal to power MOSFET module.
As a preferred embodiment, the drain voltage VDThe port signal processing module being connected to and the source electrode
Voltage VSThe port signal processing module being connected to respectively includes a pressure-resistant diode.
As a preferred embodiment, the biasing circuit module includes 3rd resistor, the 4th resistance, the 4th diode,
Described in 3rd resistor it is in parallel with the 4th resistance and the series circuit of the 4th diode.
As a preferred embodiment, the voltage comparison module includes hysteresis voltage comparator.
As a preferred embodiment, the power MOSFET module includes N-channel MOS FET.
As a preferred embodiment, the breakdown voltage of the pressure-resistant diode is 60V.
Implement the utility model, can realize at least following advantageous effect：Synchronous rectification module its function as one
Rectifier diode in the application of low-voltage, high-current, is compared rectifier diode, is greatly reduced since its conducting resistance is extremely low
Power attenuation facilitates the quick charge of lithium battery to improve power supply conversion efficiency.It is existing compared to quick charge simultaneously
Technology greatly reduces cost.
Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail.
【Description of the drawings】
Fig. 1 show traditional lithium battery charging circuit；
Fig. 2 show the circuit that the prior art realizes lithium battery quick charge；
Fig. 3 show the overall structure diagram of lithium battery quick-charging circuit provided by the utility model；
Fig. 4 show the internal structure modular diagram of synchronous rectification module provided by the utility model；
Fig. 5 show the course of work schematic diagram of synchronous rectification module provided by the utility model；
Fig. 6 show the specific implementation mode schematic diagram of synchronous rectification module provided by the utility model.
【Specific implementation mode】
With reference to figure 3- Fig. 6, as shown in figure 3, the utility model replaces traditional rectifier diode with synchronous rectification module, by
It is extremely low in its conducting resistance, in the application of low-voltage, high-current, rectifier diode is compared, power attenuation is greatly reduced, to
Power supply conversion efficiency is improved, the quick charge of lithium battery is facilitated.It is greatly reduced compared to the prior art of quick charge simultaneously
Cost.
As shown in figure 3, a kind of lithium battery quick-charging circuit provided by the utility model includes：It is connected to the first of transformer
The power module 10 at grade end, is connected to the charge control module 20 at transformer secondary output end, charge control module is connected to lithium battery
30, charge control module includes synchronous rectification module 100.
As shown in figure 4, synchronous rectification module 100 includes biasing circuit module 110, power MOSFET module 120, voltage ratio
Compared with module 130 and recommending output mode module 140, the drain voltage V of power MOSFET module 120D, source voltage VSPass through end respectively
Mouth signal processing module 152 and 154 input voltage comparison module 130 of port signal processing module, the secondary end of transformer is inclined
Circuits module 110 provides voltage, the reference voltage input voltage comparison module 130 that biasing circuit module 110 provides, voltage ratio
Recommending output mode module 140 is outputed signal to compared with module 130, recommending output mode module 140 outputs signal to power MOSFET module
120。
As shown in fig. 6, drain voltage VDThe port signal processing module 152 being connected to includes a pressure-resistant diode D1,
Source voltage VSThe port signal processing module 154 being connected to includes a pressure-resistant diode D2.Biasing circuit module 110 includes
3rd resistor R3, the 4th resistance R4, the 4th diode D4's, wherein 3rd resistor R3 and the 4th resistance R4 and the 4th diode D4
Series circuit is in parallel.Voltage comparison module 130 includes hysteresis voltage comparator 2.It is influenced by prime transformer, VD、VSPort signal
Disturbance is had, to prevent circuit from malfunctioning, builtin voltage comparator design is the band hysteresis voltage comparator of anti-saltus step, than
It is bigger compared with the Turn-off threshold value ratio Turn-on threshold values of device.Power MOSFET module 120 includes N-channel MOS FET.Pressure-resistant two poles
The breakdown voltage of pipe D1 and D2 are 60V.VDEnd peak voltage can cause the damage of circuit higher than 60V, therefore only be useful in low electricity
The application scenario of High-current output, the output of lithium battery quick charge scheme is pressed to be generally 5V/3A, 5V/4A, 9V/2A, 12V/2A
Deng particularly suitable.Recommending output mode module 140 includes Q1 and Q2, wherein Q1 can choose ambipolar NPN pipes, can also choose N
Channel MOS tube, Q2 can choose ambipolar PNP pipe, can also choose P-channel metal-oxide-semiconductor.
With reference to figure 5, using quick-charging circuit as described above, specific implementation method is：Power module 10 passes through transformation
Device provides voltage for circuit, and for charging for lithium battery 30, synchronous rectification module 100 is used to provide the electric current for stablizing flow direction；Its
In, by monitoring drain voltage V in real timeD, source voltage VS, by VOS(VOS=VD-VS) provided with the biasing circuit module 110
Vth1 and Vth2 be compared by the voltage comparison module 130, to control the opening of power MOSFET module 120, break.Its
Middle Vth1 is more than Vth2, works as VOSIt when less than Vth2, is exported by the recommending output mode module drive, generation one acts on described
The control voltage of the grid of power MOSFET module 120 makes power MOSFET module 120 open, and starts rectification work, works as detection
To VOSWhen more than Vth1, power MOSFET module 120 is made to turn off；Port signal processing module 152,154 absorbs and isolation spike
Voltage.
See on the whole, circuit only there are three input port, respectively power supply side VDD, power MOSFET module 120
Drain electrode input VDV is inputted with source electrodeS, circuit structure is simple, technique is easily realized.
But it should not be understood as limiting the scope of the patent of the utility model.It should be pointed out that for ability
For the those of ordinary skill in domain, without departing from the concept of the premise utility, various modifications and improvements can be made,
Such as the different characteristic in each embodiment is combined, these belong to the scope of protection of the utility model.
Claims (6)
1. a kind of lithium battery quick-charging circuit, including：It is connected to the power module of the primary side of transformer, is connected to transformer
The charge control module of secondary end, charge control module are connected to lithium battery, which is characterized in that the charge control module includes
Synchronous rectification module, the synchronous rectification module include biasing circuit module, power MOSFET module, voltage comparison module and push away
Draw output module；
The drain voltage V of the power MOSFET moduleD, source voltage VSIt is inputted respectively by a port signal processing module
The secondary end of voltage comparison module, transformer provides voltage for the biasing circuit module, what the biasing circuit module provided
Reference voltage inputs the voltage comparison module, and the voltage comparison module outputs signal to recommending output mode module, described to recommend
Output module outputs signal to power MOSFET module.
2. lithium battery quick-charging circuit as described in claim 1, which is characterized in that the drain voltage VDThe institute being connected to
State port signal processing module and the source voltage VSThe port signal processing module being connected to respectively include one it is resistance to
Press diode.
3. lithium battery quick-charging circuit as claimed in claim 2, which is characterized in that the biasing circuit module includes third
Resistance, the 4th resistance, the 4th diode, wherein the 3rd resistor and the 4th resistance and the 4th diode are connected
Circuit in parallel.
4. lithium battery quick-charging circuit as claimed in claim 3, which is characterized in that the voltage comparison module includes sluggishness
Voltage comparator.
5. lithium battery quick-charging circuit as claimed in claim 4, which is characterized in that the power MOSFET module includes N
Channel mosfet.
6. lithium battery quick-charging circuit as claimed in claim 5, which is characterized in that the breakdown voltage of the pressure resistance diode
For 60V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820270745.3U CN207853536U (en) | 2018-02-26 | 2018-02-26 | A kind of lithium battery quick-charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820270745.3U CN207853536U (en) | 2018-02-26 | 2018-02-26 | A kind of lithium battery quick-charging circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207853536U true CN207853536U (en) | 2018-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820270745.3U Active CN207853536U (en) | 2018-02-26 | 2018-02-26 | A kind of lithium battery quick-charging circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108199456A (en) * | 2018-02-26 | 2018-06-22 | 深圳市梓晶微科技有限公司 | A kind of lithium battery quick-charging circuit and charging method |
-
2018
- 2018-02-26 CN CN201820270745.3U patent/CN207853536U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108199456A (en) * | 2018-02-26 | 2018-06-22 | 深圳市梓晶微科技有限公司 | A kind of lithium battery quick-charging circuit and charging method |
| CN108199456B (en) * | 2018-02-26 | 2024-01-05 | 深圳市梓晶微科技有限公司 | Quick charging circuit and charging method for lithium battery |
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