CN219739989U - Constant-current constant-voltage charging circuit - Google Patents
Constant-current constant-voltage charging circuit Download PDFInfo
- Publication number
- CN219739989U CN219739989U CN202320310161.5U CN202320310161U CN219739989U CN 219739989 U CN219739989 U CN 219739989U CN 202320310161 U CN202320310161 U CN 202320310161U CN 219739989 U CN219739989 U CN 219739989U
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- China
- Prior art keywords
- circuit
- constant
- capacitor
- voltage charging
- mode
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- 238000010281 constant-current constant-voltage charging Methods 0.000 title claims description 10
- 239000003990 capacitor Substances 0.000 claims description 34
- 238000002955 isolation Methods 0.000 claims 3
- 238000007600 charging Methods 0.000 abstract description 9
- 238000010280 constant potential charging Methods 0.000 abstract description 5
- 238000010277 constant-current charging Methods 0.000 abstract description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 7
- 229910052744 lithium Inorganic materials 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model discloses a constant-current and constant-voltage charging circuit which comprises an input filter circuit, an APFC circuit, an isolated DC-DC circuit and an output filter circuit, wherein the input filter circuit is connected with the APFC circuit, the APFC circuit is connected with the isolated DC-DC circuit, and the isolated DC-DC circuit is connected with the output filter circuit. The charging of the utility model has the protection of overcharge, overvoltage, overcurrent, overpower, overheat, short circuit and the like, and ensures the safety and the reliability of the charging.
Description
Technical Field
The utility model relates to the field of electronic circuits, in particular to a constant-current constant-voltage charging circuit.
Background
The charger is a charger specially used for charging the host lithium battery. The lithium battery has high requirements on the charger and needs a protection circuit, so the lithium battery charger has high control precision and can charge the lithium battery with constant current and constant voltage.
The existing charging circuit has almost no constant current and constant voltage effects on the lithium battery during charging.
In view of the above problems, the present utility model provides a constant-current and constant-voltage charging circuit capable of performing constant-current and constant-voltage charging on a lithium battery.
Disclosure of Invention
The utility model provides a constant-current constant-voltage charging circuit capable of carrying out constant-current constant-voltage charging on a lithium battery.
The utility model aims to provide a constant-current and constant-voltage charging circuit which comprises an input filter circuit, an APFC circuit, an isolated DC-DC circuit and an output filter circuit, wherein the input filter circuit is connected with the APFC circuit, the APFC circuit is connected with the isolated DC-DC circuit, and the isolated DC-DC circuit is connected with the output filter circuit.
Furthermore, the input filter circuit comprises a fuse, a piezoresistor, a transconductance capacitor, a common-mode inductor and a differential-mode capacitor, wherein the piezoresistor is connected between the live wire and the zero wire in parallel, the differential-mode capacitor and the transconductance capacitor are connected in parallel in the circuit, and the common-mode inductor and the fuse are connected in series in the circuit.
Further, the isolated DC-DC circuit comprises a differential mode capacitor and a resistor, and the differential mode capacitor and the capacitor are connected in parallel in the circuit.
Further, the output filter circuit comprises a differential mode capacitor, a common mode inductor, a capacitor and an inductor, wherein the differential mode capacitor and the capacitor are connected in parallel in the circuit, and the common mode inductor and the inductor are connected in series in the circuit.
The utility model has the following advantages: the charging of the utility model has the protection of overcharge, overvoltage, overcurrent, overpower, overheat, short circuit and the like, and ensures the safety and the reliability of the charging.
Drawings
FIG. 1 is a diagram of an input filter circuit of the present utility model;
FIG. 2 is a circuit diagram of an APFC of the present utility model;
FIG. 3 is an isolated DC-DC circuit diagram of the present utility model;
fig. 4 is a diagram of an output filter circuit of the present utility model.
Detailed Description
The utility model provides a constant-current constant-voltage charging circuit which comprises an input filter circuit, an APFC circuit, an isolated DC-DC circuit and an output filter circuit, wherein the input filter circuit is connected with the APFC circuit, the APFC circuit is connected with the isolated DC-DC circuit, and the isolated DC-DC circuit is connected with the output filter circuit.
In this embodiment, the input filter circuit includes a fuse, a varistor, a transconductance capacitor, a common-mode inductor and a differential-mode capacitor, where the varistor is connected in parallel between the live line and the zero line, the differential-mode capacitor and the transconductance capacitor are both connected in parallel in the circuit, and the common-mode inductor and the fuse are both connected in series in the circuit.
In this embodiment, the isolated DC-DC circuit includes a differential mode capacitor and a resistor, both of which are connected in parallel in the circuit.
In this embodiment, the output filter circuit includes a differential mode capacitor, a common mode inductor, a capacitor and an inductor, where the differential mode capacitor and the capacitor are connected in parallel in the circuit, and the common mode inductor and the inductor are connected in series in the circuit.
In this embodiment, the charging circuit is charged with a constant current at normal temperature, and the constant current charging time of the charging circuit is shortened at low temperature, so that the constant voltage charging mode is entered quickly.
In this embodiment, the ac comes in, through the fuse, if the rectifying and filtering circuit at the later stage of the power supply fails and is short-circuited, the fuse will be fused to disconnect the power supply from the input source, so as to ensure that other power supply devices of the input source are not affected, the piezoresistor is used for absorbing the transient high-voltage energy conducted by the input source, clamping the voltage within a reasonable range, protecting the later-stage devices from being damaged, the differential mode capacitor and the common mode inductor are used for inhibiting the differential mode interference of different frequency bands, so that the output ripple reaches the index requirement, and the ESR of the capacitor is reduced by using a plurality of differential mode capacitors with the same capacitance in parallel, so that the interference is better filtered.
Although specific embodiments of the utility model have been described in detail with reference to the accompanying drawings, it should not be construed as limiting the scope of protection of the present patent. Various modifications and variations which may be made by those skilled in the art without the creative effort are within the scope of the patent described in the claims.
Claims (4)
1. The utility model provides a constant current constant voltage charging circuit, includes input filter circuit, APFC circuit, keeps apart DC-DC circuit and output filter circuit, its characterized in that: the input filter circuit is connected with the APFC circuit, the APFC circuit is connected with the isolation DC-DC circuit, and the isolation DC-DC circuit is connected with the output filter circuit.
2. The constant-current constant-voltage charging circuit according to claim 1, wherein: the input filter circuit comprises a fuse, a piezoresistor, a transconductance capacitor, a common-mode inductor and a differential-mode capacitor, wherein the piezoresistor is connected between a live wire and a zero wire in parallel, the differential-mode capacitor and the transconductance capacitor are connected in parallel in the circuit, and the common-mode inductor and the fuse are connected in series in the circuit.
3. The constant-current constant-voltage charging circuit according to claim 1, wherein: the isolation DC-DC circuit comprises a differential mode capacitor and a resistor, and the differential mode capacitor and the capacitor are connected in parallel in the circuit.
4. The constant-current constant-voltage charging circuit according to claim 1, wherein: the output filter circuit comprises a differential mode capacitor, a common mode inductor, a capacitor and an inductor, wherein the differential mode capacitor and the capacitor are connected in parallel in the circuit, and the common mode inductor and the inductor are connected in series in the circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320310161.5U CN219739989U (en) | 2023-02-24 | 2023-02-24 | Constant-current constant-voltage charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320310161.5U CN219739989U (en) | 2023-02-24 | 2023-02-24 | Constant-current constant-voltage charging circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219739989U true CN219739989U (en) | 2023-09-22 |
Family
ID=88027760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320310161.5U Active CN219739989U (en) | 2023-02-24 | 2023-02-24 | Constant-current constant-voltage charging circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219739989U (en) |
-
2023
- 2023-02-24 CN CN202320310161.5U patent/CN219739989U/en active Active
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |