CN219227265U - Output voltage adjusting circuit of mobile phone charger - Google Patents
Output voltage adjusting circuit of mobile phone charger Download PDFInfo
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- CN219227265U CN219227265U CN202223325063.3U CN202223325063U CN219227265U CN 219227265 U CN219227265 U CN 219227265U CN 202223325063 U CN202223325063 U CN 202223325063U CN 219227265 U CN219227265 U CN 219227265U
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- mobile phone
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
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Abstract
The utility model discloses an output voltage adjusting circuit of a mobile phone charger, which comprises an input power supply, a transformer, a bridge rectifier circuit, a power management chip, a first electrolytic capacitor, a first adjustable resistor, a first diode, a second electrolytic capacitor and a third electrolytic capacitor, wherein the input power supply is connected with the input end of the transformer, the first output end of the bridge rectifier circuit is connected with an IN pin of the power management chip, and the second output end of the bridge rectifier circuit is connected with the sliding end of the first adjustable resistor. The input voltage of the input power supply can be reduced through the transformer, then the current is electrically converted into direct current through the bridge rectifier circuit, the output voltage of the direct current is regulated through the power management chip and the first adjustable resistor, the adjustable range of the output voltage is 1.25V-25V, different output voltages are regulated according to different electric equipment, a single charger is adaptive to multiple electric equipment, and the resource utilization rate is improved.
Description
Technical Field
The utility model relates to the field of mobile phone chargers, in particular to an output voltage adjusting circuit of a mobile phone charger.
Background
In the prior art, the output voltage and current of a USB (universal serial bus) charger equipped in a traditional mobile phone factory are fixed, and different output voltages cannot be adjusted according to different electric equipment, so that different electric equipment needs to be equipped with different chargers, and resource waste is caused. The traditional mobile phone charging adapter generally has 5V and 1A output voltage and current, and for electric equipment requiring input current less than 1A, other unexpected situations such as battery overcharge, large heating value, shortened battery life and the like can be caused; in addition, for the tablet personal computers or high-capacity mobile phone batteries which are used in large quantities at present, the input voltage is generally 5V to 12V, and the input current is generally 1A-2.5A, so that the traditional USB charging adapter with output of 5V-1A/2A cannot be used, and only a special charging adapter can be purchased additionally.
Accordingly, the prior art has drawbacks and needs improvement.
Disclosure of Invention
The technical problems to be solved by the utility model are as follows: the output voltage adjusting circuit of the mobile phone charger is wide in application range and convenient to use.
The technical scheme of the utility model is as follows: an output voltage adjusting circuit of a mobile phone charger comprises an input power supply, a transformer, a bridge rectifier circuit, a power management chip, a first electrolytic capacitor, a first adjustable resistor, a first diode, a second electrolytic capacitor, a third electrolytic capacitor and a first resistor;
the input power supply is connected with the input end of the transformer, the first output end of the transformer is connected with the first input end of the bridge rectifier circuit, and the second output end of the transformer is connected with the second input end of the bridge rectifier circuit;
the first output end of the bridge rectifier circuit is connected with an IN pin of the power management chip, and the second output end of the bridge rectifier circuit is connected with the sliding end of the first adjustable resistor;
the first fixed end of the first adjustable resistor is connected with the ADJ pin of the power management chip, and the second fixed end of the first adjustable resistor is respectively connected with the negative electrode of the first electrolytic capacitor, the negative electrode of the second electrolytic capacitor, the negative electrode of the third electrolytic capacitor and the first end of the first resistor;
the OUT pin of the power management chip is respectively connected with the anode of the first electrolytic capacitor, the first fixed end of the first adjustable resistor and the anode of the first diode;
the output voltage connected with the mobile phone battery is respectively connected with the cathode of the first diode, the anode of the second diode, the anode of the third electrolytic capacitor and the second end of the first resistor;
the anode of the second electrolytic capacitor is connected with the cathode of the second diode.
By adopting the technical scheme, the output voltage adjusting circuit of the mobile phone charger further comprises a second resistor, and the OUT pin of the power management chip passes through the second resistor and is connected with the anode of the first electrolytic capacitor, the first fixed end of the first adjustable resistor and the anode of the first diode.
By adopting the technical schemes, the output voltage adjusting circuit of the mobile phone charger further comprises a third resistor, and the third resistor is connected in series between the output voltage of the mobile phone battery and the first resistor.
By adopting the technical schemes, in the output voltage adjusting circuit of the mobile phone charger, the model of the power management chip is LM317T.
By adopting the above technical schemes, the output voltage adjusting circuit of the mobile phone charger further comprises an A/D conversion chip and a second adjustable resistor, wherein the first fixed end of the second adjustable resistor is connected with the first end of the first resistor, the second fixed end of the second adjustable resistor is connected with the second end of the first resistor, the second pin of the A/D conversion chip is connected with the second fixed end of the second adjustable resistor, and the third pin of the A/D conversion chip is connected with the sliding end of the second adjustable resistor.
By adopting the technical schemes, in the output voltage adjusting circuit of the mobile phone charger, the model of the A/D conversion chip is ADC0832.
By adopting the technical schemes, in the output voltage adjusting circuit of the mobile phone charger, the resistance value of the first resistor is 10 Kohm.
By adopting the technical schemes, in the output voltage adjusting circuit of the mobile phone charger, the resistance value of the second resistor is 200 Kohm.
By adopting the technical schemes, in the output voltage adjusting circuit of the mobile phone charger, the resistance value of the third resistor is 90 Kohm.
By adopting the technical schemes, in the output voltage adjusting circuit of the mobile phone charger, the output voltage of the input power supply is 220V.
Compared with the prior art, the input voltage of the input power supply can be reduced through the transformer, then the current is electrically converted into direct current through the bridge rectifier circuit, the output voltage of the direct current is regulated through the power management chip and the first adjustable resistor, the adjustable range of the output voltage is 1.25V-25V, different output voltages are regulated according to different electric equipment, a single charger is adapted to various electric equipment, and the resource utilization rate is improved.
Drawings
FIG. 1 is a schematic diagram of a circuit connection relationship according to the present utility model;
FIG. 2 is a schematic diagram showing the pin relationship of the A/D conversion chip of the present utility model.
Detailed Description
The utility model will be described in detail below with reference to the drawings and the specific embodiments.
In the description of the present utility model, it should be noted that the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1 and 2, an output voltage adjusting circuit of a mobile phone charger includes an input power P, a transformer T, a bridge rectifier D, a power management chip U1, a first electrolytic capacitor C1, a first adjustable resistor RV1, a first diode D1, a second diode D2, a second electrolytic capacitor C2, a third electrolytic capacitor C3, and a first resistor R1;
the input power supply P is connected with the input end of the transformer T, the first output end of the transformer T is connected with the first input end of the bridge rectifier circuit D, and the second output end of the transformer T is connected with the second input end of the bridge rectifier circuit D;
the first output end of the bridge rectifier circuit D is connected with an IN pin of the power management chip U1, and the second output end of the bridge rectifier circuit D is connected with the sliding end of the first adjustable resistor RV 1;
the first fixed end of the first adjustable resistor RV1 is connected with an ADJ pin of the power management chip U1, and the second fixed end of the first adjustable resistor RV1 is respectively connected with the negative electrode of the first electrolytic capacitor C1, the negative electrode of the second electrolytic capacitor C2, the negative electrode of the third electrolytic capacitor C3 and the first end of the first resistor R1;
the OUT pin of the power management chip U1 is respectively connected with the anode of the first electrolytic capacitor C1, the first fixed end of the first adjustable resistor and the anode of the first diode D1;
the output voltage Vo connected with the mobile phone battery is respectively connected with the cathode of the first diode D1, the anode of the second diode D2, the anode of the third electrolytic capacitor C3 and the second end of the first resistor R1, and the anode of the second electrolytic capacitor C2 is connected with the cathode of the second diode D2.
In this embodiment, the input voltage of the input power P can be reduced by the transformer T, and then the current is electrically converted into the direct current by the bridge rectifier circuit D, the second electrolytic capacitor C2 can filter the ripple wave of the rectified direct current, and the output voltage of the direct current is adjusted by the power management chip U1 and the first adjustable resistor RV1, and at this time, the output voltage adjustment calculation formula of the direct current is as follows: vo=1.25 (1+rv1/R1), and the voltage of the output voltage can be adjusted by adjusting the resistance value of the first adjustable resistor RV1, so that the application range is wide. The arrangement of the first diode D1 and the second diode D2 can prevent the occurrence of the phenomenon of short-circuit breakdown of the power management chip U1. The first electrolytic capacitor C1 and the third electrolytic capacitor C3 can continuously filter the ripple wave from the output voltage, and charge the battery through the output voltage Vo.
Further, the power management chip further comprises a second resistor R2, and the OUT pin of the power management chip U1 passes through the second resistor R2 and is connected with the positive electrode of the first electrolytic capacitor C1, the first fixed end of the first adjustable resistor RV1 and the positive electrode of the first diode D1.
Further, the battery pack further comprises a third resistor R3, and the third resistor R3 is connected in series between the output voltage Vo of the mobile phone battery and the first resistor R1.
Further, the model of the power management chip U1 is LM317T.
Further, the circuit further comprises an A/D conversion chip U2 and a second adjustable resistor RV2, wherein a first fixed end of the second adjustable resistor RV2 is connected with a first end of the first resistor R1, a second fixed end of the second adjustable resistor RV2 is connected with a second end of the first resistor R1, a second pin of the A/D conversion chip is connected with a second fixed end of the second adjustable resistor RV2, and a third pin of the A/D conversion chip U2 is connected with a sliding end of the second adjustable resistor RV 2. The A/D conversion chip U2 can be electrically connected with an external singlechip to detect and collect charging voltage signals, input the charging voltage signals to the singlechip and output the charging voltage signals through an external display module, so that a user can intuitively know the current output voltage.
Further, the model of the a/D conversion chip U2 is ADC0832.
Further, the resistance value of the first resistor R1 is 10K ohms.
Further, the resistance value of the second resistor R2 is 200K ohms.
Further, the resistance value of the third resistor R3 is 90K ohms.
Further, the output voltage of the input power source P is 220V.
Compared with the prior art, the input voltage of the input power supply can be reduced through the transformer, then the current is electrically converted into direct current through the bridge rectifier circuit, the output voltage of the direct current is regulated through the power management chip and the first adjustable resistor, the adjustable range of the output voltage is 1.25V-25V, different output voltages are regulated according to different electric equipment, a single charger is adapted to various electric equipment, and the resource utilization rate is improved.
The foregoing description of the preferred embodiment of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (9)
1. An output voltage adjusting circuit of a mobile phone charger is characterized in that: the power supply comprises an input power supply, a transformer, a bridge rectifier circuit, a power supply management chip, a first electrolytic capacitor, a first adjustable resistor, a first diode, a second electrolytic capacitor, a third electrolytic capacitor and a first resistor;
the input power supply is connected with the input end of the transformer, the first output end of the transformer is connected with the first input end of the bridge rectifier circuit, and the second output end of the transformer is connected with the second input end of the bridge rectifier circuit;
the first output end of the bridge rectifier circuit is connected with an IN pin of the power management chip, and the second output end of the bridge rectifier circuit is connected with the sliding end of the first adjustable resistor;
the first fixed end of the first adjustable resistor is connected with the ADJ pin of the power management chip, and the second fixed end of the first adjustable resistor is respectively connected with the negative electrode of the first electrolytic capacitor, the negative electrode of the second electrolytic capacitor, the negative electrode of the third electrolytic capacitor and the first end of the first resistor;
the OUT pin of the power management chip is respectively connected with the anode of the first electrolytic capacitor, the first fixed end of the first adjustable resistor and the anode of the first diode;
the output voltage connected with the mobile phone battery is respectively connected with the cathode of the first diode, the anode of the second diode, the anode of the third electrolytic capacitor and the second end of the first resistor;
the anode of the second electrolytic capacitor is connected with the cathode of the second diode;
the circuit also comprises an A/D conversion chip and a second adjustable resistor, wherein the first fixed end of the second adjustable resistor is connected with the first end of the first resistor, the second fixed end of the second adjustable resistor is connected with the second end of the first resistor, the second pin of the A/D conversion chip is connected with the second fixed end of the second adjustable resistor, and the third pin of the A/D conversion chip is connected with the sliding end of the second adjustable resistor.
2. The output voltage adjustment circuit of a mobile phone charger according to claim 1, wherein: the power management chip is characterized by further comprising a second resistor, wherein an OUT pin of the power management chip passes through the second resistor and is connected with the anode of the first electrolytic capacitor, the first fixed end of the first adjustable resistor and the anode of the first diode.
3. The output voltage adjustment circuit of a mobile phone charger according to claim 1, wherein: the battery also comprises a third resistor which is connected in series between the output voltage of the mobile phone battery and the first resistor.
4. The output voltage adjustment circuit of a mobile phone charger according to claim 1, wherein: the model of the power management chip is LM317T.
5. The output voltage adjustment circuit of a mobile phone charger according to claim 1, wherein: the A/D conversion chip is of the type ADC0832.
6. The output voltage adjustment circuit of a mobile phone charger according to claim 1, wherein: the resistance value of the first resistor is 10K ohms.
7. The output voltage adjustment circuit of a mobile phone charger according to claim 2, wherein: the resistance value of the second resistor is 200 Kohm.
8. The output voltage adjustment circuit of a mobile phone charger according to claim 3, wherein: and the resistance value of the third resistor is 90K ohms.
9. The output voltage adjusting circuit of a mobile phone charger according to any one of claims 1 to 8, wherein: the output voltage of the input power supply is 220V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223325063.3U CN219227265U (en) | 2022-12-12 | 2022-12-12 | Output voltage adjusting circuit of mobile phone charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223325063.3U CN219227265U (en) | 2022-12-12 | 2022-12-12 | Output voltage adjusting circuit of mobile phone charger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219227265U true CN219227265U (en) | 2023-06-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223325063.3U Active CN219227265U (en) | 2022-12-12 | 2022-12-12 | Output voltage adjusting circuit of mobile phone charger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219227265U (en) |
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2022
- 2022-12-12 CN CN202223325063.3U patent/CN219227265U/en active Active
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