CN215646212U - Overvoltage protection charging cable circuit - Google Patents
Overvoltage protection charging cable circuit Download PDFInfo
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- CN215646212U CN215646212U CN202120184701.0U CN202120184701U CN215646212U CN 215646212 U CN215646212 U CN 215646212U CN 202120184701 U CN202120184701 U CN 202120184701U CN 215646212 U CN215646212 U CN 215646212U
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Abstract
The utility model discloses an overvoltage protection charging cable circuit, which comprises a USB-A interface and a Lightning interface connected with the USB-A interface, an overvoltage protection circuit is arranged between the Lightning interface and the USB-A interface, the overvoltage protection circuit comprises a PMOS transistor, a first voltage stabilizing diode and a control chip, the power pin of the USB-A interface is connected with the first voltage-stabilizing diode through the second resistor and the fourth pin of the control chip through the third resistor, the drain electrode of the PMOS transistor is connected with a signal pin of a Lightning interface, the source electrode of the PMOS transistor is connected with a power supply pin of a USB-A interface, the grid electrode of the PMOS transistor is connected with a control chip, the source electrode and the drain electrode of the PMOS transistor are connected through a first resistor, the first voltage stabilizing diode is grounded, and a capacitor is arranged between the second pin and the third pin of the control chip, and the second pin of the control chip is grounded. The overvoltage protection charging cable circuit provided by the utility model can still continue to charge the apple electronic equipment when the voltage stabilizing diode is damaged due to overhigh charging voltage.
Description
Technical Field
The utility model relates to the technical field of electronic circuits, in particular to an overvoltage protection charging cable circuit.
Background
One end of a charging cable of an existing apple electronic device is a USB interface, the other end of the charging cable is a Lightning interface (a charging connector made by apple Inc. in America), the USB interface is connected with a charger during charging, and the Lightning interface is connected with the apple electronic device.
Because be equipped with zener diode in the charging cable of Lightning interface, when the voltage through the Lightning interface was too high, zener diode can burn out, though do not cause harm to apple electronic equipment, no current flow through in the control chip of Lightning interface this moment, this charging cable can't continue to charge promptly, need change new charging cable to increase charging cable's use amount, be unfavorable for the protection of environment.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an overvoltage protection charging cable circuit which can still continuously charge apple electronic equipment when a voltage stabilizing diode is damaged due to overhigh charging voltage.
The utility model discloses an overvoltage protection charging cable circuit and a charging cable adopting the technical scheme that:
the overvoltage protection charging cable circuit comprises a USB-A interface and a Lightning interface connected with the USB-A interface, wherein an overvoltage protection circuit is arranged between the Lightning interface and the USB-A interface, the overvoltage protection circuit comprises a PMOS (P-channel metal oxide semiconductor) transistor, a control chip, a first resistor, a second resistor, a third resistor, a capacitor and a first voltage stabilizing diode, a grid electrode of the PMOS transistor is connected with a sixth pin of the control chip, a source electrode of the PMOS transistor is connected with a power supply pin of the USB-A interface, a drain electrode of the PMOS transistor is connected with a signal pin of the Lightning interface, two ends of the first resistor are respectively connected with a drain electrode and a source electrode of the PMOS transistor, one end of the second resistor is connected with the power supply pin of the USB-A interface, the other end of the second resistor is connected with the first voltage stabilizing diode, the first voltage stabilizing diode is grounded, and one end of the capacitor is connected with a second pin of the control chip, The other end of the third resistor is connected with a third pin of the control chip, a second pin of the control chip is grounded, one end of the third resistor is connected with a fourth pin of the control chip, the other end of the third resistor is connected with a power supply pin of the USB-A interface, and a first pin of the control chip is connected with a signal pin of the Lightning interface.
Preferably, the voltage regulator further comprises a second voltage regulator diode, wherein one end of the second voltage regulator diode is connected with the drain electrode of the PMOS transistor, and the other end of the second voltage regulator diode is grounded.
Preferably, the lighting device further comprises a third zener diode, wherein one end of the third zener diode is connected to the signal pin of the lighting interface, and the other end of the third zener diode is grounded.
Preferably, the first resistor has a resistance of 120 ohms, the second resistor has a resistance of 20 ohms, the third resistor has a resistance of 1 kilo-ohm, and the capacitor has a capacity of 100 nanofarads.
Preferably, the model of the control chip is BL 10.
The utility model discloses an overvoltage protection charging cable circuit, which has the beneficial effects that: in the process of charging the apple electronic equipment by the Lightning interface, when the charging voltage is too high, the first voltage stabilizing diode in the protection circuit of the Lightning interface can be burnt out, because the first voltage stabilizing diode is connected with the second resistor in series and grounded, the circuit provided with the first voltage stabilizing diode is in a non-short circuit state, the current still passes through the control chip, namely, the charging cable can be continuously charged, so that the second resistor is connected with the first voltage stabilizing diode in series, and the fact that when the charging voltage is too high, the first voltage stabilizing diode is damaged, the apple electronic equipment can still be continuously charged is realized.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:
fig. 1 is a schematic diagram of an overvoltage protection charging cable circuit according to the present invention.
Detailed Description
The utility model will be further elucidated and described with reference to the embodiments and drawings of the specification:
referring to fig. 1, an overvoltage protection charging cable circuit includes a USB-a interface P1 and a Lightning interface J1 connected to the USB-a interface P1, an overvoltage protection circuit is disposed between the Lightning interface J1 and the USB-a interface P1, the overvoltage protection circuit includes a PMOS transistor Q1, a control chip U1, a first resistor R1, a second resistor R2, a third resistor R3, a capacitor C1 and a first zener diode D3, a gate of the PMOS transistor Q1 is connected to a sixth pin of the control chip U1, a source of the PMOS transistor Q1 is connected to a power pin of the USB-a interface P1, a drain of the PMOS transistor Q1 is connected to a signal pin of the Lightning interface J1, two ends of the first resistor R1 are respectively connected to a drain and a source of the PMOS transistor Q1, one end of the second resistor R2 is connected to the power pin of the USB-a interface P1, the other end of the second resistor R2 is connected to a first zener diode D2, one end of the first resistor R69556 is connected to a ground, and one end of the second zener diode 8653 is connected to a control chip U828653, The other end of the third resistor R3 is connected with a third pin of the control chip U1, a second pin of the control chip U1 is grounded, one end of the third resistor R3 is connected with a fourth pin of the control chip U1, the other end of the third resistor R is connected with a power supply pin of the USB-A interface P1, and a first pin of the control chip U1 is connected with two signal pins of the Lightning interface J1.
By providing the first zener diode D3, static electricity from the USB-a interface P1 to the PMOS transistor Q1 is protected. In the process that the charging cable provided with the overvoltage protection charging cable circuit charges the apple electronic equipment, when the charging voltage is too high, the first voltage stabilizing diode D3 in the protection circuit connected with the Lightning interface J1 is burnt out, and because the first voltage stabilizing diode D3 is connected with the second resistor R2 in series and grounded, at this time, the circuit provided with the first voltage stabilizing diode D3 is in a non-short-circuit state, current still passes through the control chip U1, namely, the charging cable can be charged continuously, so that the second resistor R2 is connected with the first voltage stabilizing diode D3 in series, when the charging voltage is too high, the first voltage stabilizing diode D3 is damaged, the apple electronic equipment can still be charged continuously, and meanwhile, the overvoltage protection of the charged apple electronic equipment is realized.
And the voltage regulator further comprises a second voltage regulator diode D1, wherein one end of the second voltage regulator diode D1 is connected with the drain electrode of the PMOS transistor Q1, and the other end of the second voltage regulator diode D1 is grounded. By providing the second zener diode D1, static electricity from the power pin of the Lightning interface to the PMOS transistor Q1 is protected.
The Lightning protection circuit further comprises a third zener diode D2, wherein one end of the third zener diode D2 is connected with the first pin of the Lightning interface J1, and the other end is grounded. By providing the third zener diode D2, static electricity from the two signal pins of the Lightning interface to the control chip U1 is protected.
When the resistance of the first resistor R1 is 120 ohms, the resistance of the second resistor R2 is 20 ohms, the resistance of the third resistor R3 is 1 kilo-ohm, and the capacity of the capacitor C1 is 100 nanofarads, the control chip U1 can be better protected, and when the first zener diode D3 burns out, the voltage on the control chip U1 is better kept stable.
The model of the control chip is BL 10.
In summary, by providing the overvoltage protection circuit including the first resistor R1, the second resistor R2, the third resistor R3, the capacitor C1, the first voltage-stabilizing diode D3 and the control chip U1, the first voltage-stabilizing diode D3 is connected in series with the second resistor R2 and then connected to the power pin of the USB-a interface P1, when the charging voltage is too high, although the first regulated diode D3 burns out, the line with the first regulated diode D3 is not short circuited, and current still flows through the control chip U1, so that when the charging voltage is too high, while ensuring that the apple electronic device is not damaged, the Lightning interface J1 can continue to charge the apple electronic device, the protection of the static electricity from the power pin of the Lightning interface J1 to the control chip U1 is achieved by providing the second zener diode D1, the third zener diode D2 is provided to protect the static electricity from the two signal pins of the Lightning interface J1 to the control chip U1.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (5)
1. The overvoltage protection charging cable circuit is characterized by comprising a USB-A interface and a Lightning interface connected with the USB-A interface, wherein an overvoltage protection circuit is arranged between the Lightning interface and the USB-A interface and comprises a PMOS (P-channel metal oxide semiconductor) transistor, a control chip, a first resistor, a second resistor, a third resistor, a capacitor and a first voltage stabilizing diode, a grid electrode of the PMOS transistor is connected with a sixth pin of the control chip, a source electrode of the PMOS transistor is connected with a power pin of the USB-A interface, a drain electrode of the PMOS transistor is connected with a signal pin of the Lightning interface, two ends of the first resistor are respectively connected with a drain electrode and a source electrode of the PMOS transistor, one end of the second resistor is connected with the power pin of the USB-A interface, the other end of the second resistor is connected with the first voltage stabilizing diode, the first voltage stabilizing diode is grounded, and one end of the capacitor is connected with a second pin of the control chip, The other end of the third resistor is connected with a third pin of the control chip, a second pin of the control chip is grounded, one end of the third resistor is connected with a fourth pin of the control chip, the other end of the third resistor is connected with a power supply pin of the USB-A interface, and a first pin of the control chip is connected with a signal pin of the Lightning interface.
2. The over-voltage protection charging cable circuit according to claim 1, further comprising a second zener diode having one end connected to the drain of the PMOS transistor and the other end connected to ground.
3. The over-voltage protection charging cable circuit according to claim 1, further comprising a third zener diode, wherein one end of the third zener diode is connected to the signal pin of the Lightning interface, and the other end of the third zener diode is grounded.
4. The overvoltage protection charging cable circuit according to claim 1, wherein the first resistor has a resistance of 120 ohms, the second resistor has a resistance of 20 ohms, the third resistor has a resistance of 1 kilo-ohm, and the capacitor has a capacitance of 100 nanofarads.
5. The over-voltage protection charging cable circuit as claimed in claim 1, wherein the control chip is of type BL 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120184701.0U CN215646212U (en) | 2021-01-23 | 2021-01-23 | Overvoltage protection charging cable circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120184701.0U CN215646212U (en) | 2021-01-23 | 2021-01-23 | Overvoltage protection charging cable circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215646212U true CN215646212U (en) | 2022-01-25 |
Family
ID=79889126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120184701.0U Active CN215646212U (en) | 2021-01-23 | 2021-01-23 | Overvoltage protection charging cable circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215646212U (en) |
-
2021
- 2021-01-23 CN CN202120184701.0U patent/CN215646212U/en active Active
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