CN217036788U - Buck-boost constant-current charging circuit - Google Patents
Buck-boost constant-current charging circuit Download PDFInfo
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- CN217036788U CN217036788U CN202123452821.3U CN202123452821U CN217036788U CN 217036788 U CN217036788 U CN 217036788U CN 202123452821 U CN202123452821 U CN 202123452821U CN 217036788 U CN217036788 U CN 217036788U
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Abstract
The utility model provides a buck-boost constant-current charging circuit, which has the advantages of high conversion efficiency, compact structure, wide input range and strong interference resistance, and is characterized in that: the voltage-boosting and voltage-reducing circuit comprises an input voltage port, a detection circuit is connected with the input voltage port, a switch circuit is connected with the detection circuit, a voltage-boosting control circuit and a voltage-reducing control circuit are connected with the switch circuit, a constant current control circuit is respectively connected with the voltage-boosting control circuit and the voltage-reducing control circuit, an output detection circuit is connected with the constant current control circuit, and an output voltage port is connected with the output detection circuit.
Description
Technical Field
The utility model belongs to the technical field of lithium ion batteries, and particularly relates to a buck-boost constant-current charging circuit.
Background
With the wider and wider application of batteries, various devices depending on battery power supply are generally applied to daily life and work of people. People often encounter the problems of insufficient electric quantity and no alternating current beside the people when working or playing outside. In the prior art, most of the linear voltage regulators or switching capacitor type DC-DC converters or inductance type DC-DC converters have limitations, and when the input voltage difference and the output voltage difference of the linear voltage regulators are too large or the current is increased, the efficiency is reduced and only the voltage can be reduced; capacitive DC-DC can only be efficient at a certain conversion ratio; the inductive DC-DC peripheral circuit needs a larger inductor, has large volume, high cost and poor interference resistance.
Disclosure of Invention
In order to solve the technical problems, the buck-boost constant-current charging circuit is high in conversion efficiency, compact in structure, wide in input range and strong in interference resistance.
The technical scheme is as follows: the utility model provides a step-up and step-down constant current charging circuit which characterized in that: the voltage-boosting and voltage-reducing circuit comprises an input voltage port, a detection circuit is connected with the input voltage port, a switch circuit is connected with the detection circuit, a voltage-boosting control circuit and a voltage-reducing control circuit are connected with the switch circuit, a constant current control circuit is respectively connected with the voltage-boosting control circuit and the voltage-reducing control circuit, an output detection circuit is connected with the constant current control circuit, and an output voltage port is connected with the output detection circuit.
The switching circuit is further characterized in that in the switching circuit, R1 is connected with a power management chip to play a role in power identification and control; the voltage reduction control circuit consists of Q2 and Q4, and Q2 and Q4 are connected with a power management chip; the boost control circuit consists of Q3, Q5 and L1, and Q3, Q5 and L1 are connected with a power management chip; the power management chip adopts an ADI LTC3789 power chip.
By adopting the structure, the detection circuit is connected with the input voltage port, the output voltage port is connected with the detection circuit, the switch circuit is connected with the output voltage port, the boost control circuit and the buck control circuit are connected with the switch circuit, the constant current control circuit is respectively connected with the boost control circuit and the buck control circuit, and the output detection circuit is connected with the constant current control circuit.
Drawings
FIG. 1 is a schematic diagram of a buck-boost constant current charging circuit system according to the present invention;
fig. 2 is a schematic diagram of the buck-boost constant current charging circuit of the present invention.
Detailed Description
The utility model is further illustrated by the following figures and examples.
Referring to fig. 1 and 2, a single bus communication battery management circuit is characterized in that: the device comprises an input voltage port 1, a detection circuit 2 connected with the input voltage port 1, a switch circuit 3 connected with the detection circuit 2, a boost control circuit 4 and a buck control circuit 5 connected with the switch circuit 3, a constant current control circuit 6 respectively connected with the boost control circuit 4 and the buck control circuit 5, and an output detection circuit 7 connected with the constant current control circuit 5. The output voltage port 8 is connected to the output detection circuit 7.
In the switch circuit 4, R1 is connected with a power supply management chip 9 to play a role in power identification and control, the voltage reduction control circuit 6 is composed of Q2 and Q4, Q2 and Q4 are connected with the power supply management chip 9, the voltage boosting control circuit 5 is composed of Q3, Q5 and L1, Q3, Q5 and L1 are connected with the power supply management chip 9, and the power supply management chip 8 adopts an ADI LTC3789 power supply chip.
The ADI LTC3789 power supply chip is adopted for management of the circuit, the circuit has the functions of overcurrent protection, overvoltage protection and undervoltage protection, and is high in electric energy conversion efficiency, compact in structure, wide in input range and strong in interference resistance.
The present invention and its embodiments have been described in detail, without limitation, and the accompanying drawings are only one embodiment of the utility model, and the actual structure is not limited thereto, and those skilled in the art will be suggested by the teachings of the present invention, and without departing from the spirit of the present invention, without creatively designing the similar structural modes and embodiments as the technical solutions, and shall fall within the protection scope of the present invention.
Claims (5)
1. The utility model provides a step-up and step-down constant current charging circuit which characterized in that: the voltage-boosting and voltage-reducing circuit comprises an input voltage port, a detection circuit is connected with the input voltage port, a switch circuit is connected with the detection circuit, a boosting control circuit and a voltage-reducing control circuit are connected with the switch circuit, a constant current control circuit is respectively connected with the boosting control circuit and the voltage-reducing control circuit, an output detection circuit is connected with the constant current control circuit, and an output voltage port is connected with the output detection circuit.
2. The buck-boost constant current charging circuit according to claim 1, wherein: in the switching circuit, R1 is connected with a power management chip to play a role in power identification and control.
3. The buck-boost constant current charging circuit according to claim 1, wherein: the voltage reduction control circuit consists of Q2 and Q4, and Q2 and Q4 are connected with a power management chip.
4. The buck-boost constant current charging circuit according to claim 1, wherein: the boost control circuit consists of Q3, Q5 and L1, and Q3, Q5 and L1 are connected with a power management chip.
5. The buck-boost constant-current charging circuit according to claim 3 or 4, wherein: the power management chip adopts an ADI LTC3789 power chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123452821.3U CN217036788U (en) | 2021-12-31 | 2021-12-31 | Buck-boost constant-current charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123452821.3U CN217036788U (en) | 2021-12-31 | 2021-12-31 | Buck-boost constant-current charging circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217036788U true CN217036788U (en) | 2022-07-22 |
Family
ID=82445044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123452821.3U Active CN217036788U (en) | 2021-12-31 | 2021-12-31 | Buck-boost constant-current charging circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217036788U (en) |
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2021
- 2021-12-31 CN CN202123452821.3U patent/CN217036788U/en active Active
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