Self-locking power supply circuit

Abstract

A self-locking power supply circuit comprises a battery; a ground terminal; an output end; a mode switch end; the PMOS transistor comprises a source electrode electrically connected to the output end, a drain electrode electrically connected to the battery and a gate electrode; an NMOS transistor including a source electrode electrically connected to the ground terminal, a drain electrode electrically connected to the gate electrode of the PMOS transistor, and a gate electrode electrically connected to the mode switch terminal; and one end of the resistor is connected between the battery and the drain electrode of the PMOS transistor, and the other end of the resistor is connected between the gate electrode of the PMOS transistor and the drain electrode of the NMOS transistor.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of circuits, in particular to a kind of power supply circuit that battery is locked. BACKGROUND

[0002] During the transportation of electronic products from factory to consumer initial use, its battery must be locked because of long time not doing work, so that battery is in the state of minimum power consumption, to avoid product damage caused by excessive battery discharge. At present, consumers usually expect to use the user experience when purchasing electronic products, so the safety of the battery during long-term transportation of electronic products needs to be considered while the user experience is considered, which increases the design difficulty of the overall power supply circuit.

[0003] Therefore, it is necessary to provide a self-locking power supply circuit, which can lock the battery to save power consumption, and the user can easily unlock the battery when initially using. SUMMARY

[0004] The utility model discloses a kind of self-locking power supply circuits, a battery;A ground terminal;An output terminal;A mode switch end;A PMOS transistor, including one electrically connected to the source of the output terminal, one electrically connected to the drain of the battery and a gate;An NMOS transistor, including one electrically connected to the source of the ground terminal, one electrically connected to the drain of the gate of the PMOS transistor and a gate electrically connected to the mode switch end;And a resistance, one end of the resistance is connected between the battery and the drain of the PMOS transistor, the other end is connected between the gate of the PMOS transistor and the drain of the NMOS transistor.

[0005] In some embodiments, the self-locking power supply circuit further includes an external power supply connected to the output terminal;And a microcontroller, the microcontroller is connected to the output terminal and is provided with an output pin electrically connected to the mode switch end.

[0006] In some embodiments, the negative electrode of a diode is connected to the output terminal, and the positive electrode of the diode is electrically connected with the external power supply.

[0007] In some embodiments, a voltage stabilizer is connected between the output terminal and the microcontroller, the input terminal of the voltage stabilizer is electrically connected with the output terminal, and the output terminal of the voltage stabilizer is electrically connected with the microcontroller.

[0008] In some embodiments, one end of a second resistance is connected between the voltage stabilizer and the microcontroller, and the other end of the second resistance is connected between the microcontroller and the mode switch end.

[0009] In some embodiments, one end of a first element is electrically connected between the output end and the input end of the regulator, the other end of the first element is grounded, and the first element is a capacitor.

[0010] In some embodiments, one end of a second element is electrically connected between the second resistor and the microcontroller, the other end of the second element is grounded, and the second element is a capacitor.

[0011] As mentioned above, the self-locking power supply circuit of the present invention adds a transistor to the power supply path from the battery to the internal system of the electronic device. The microcontroller outputs signals of different levels to open or close the battery power path, thereby minimizing battery power consumption during transportation. Consumers can easily unlock the battery and start using the electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to make the above and other purposes, features, advantages and embodiments of the present invention more obvious and easy to understand, the content of this case can be better understood when read in conjunction with the accompanying drawings.

[0013] Figure 1 It is a circuit diagram of the self-locking power supply circuit of the utility model. DETAILED DESCRIPTION

[0014] In order to explain in detail the technical content, structural features, objectives and effects of the wireless adapter of the present invention, embodiments are given below and described in detail with reference to the drawings.

[0015] See also Figure 1The utility model discloses a self-lock power supply circuit 100 contains a battery 10, a ground terminal 20, an output end O, a PMOS transistor 40, a NMOS transistor 50, a first resistance R1 and a mode switch end S. Among them, the PMOS transistor 40 contains a source electrically connected to the output end O, a drain electrically connected to the battery 10 and a gate. The NMOS transistor 50 contains a source electrically connected to the ground terminal 20, a drain electrically connected to the gate of the PMOS transistor 40 and a gate electrically connected to the mode switch end S. One end of the first resistance R1 is connected between the battery 10 and the drain of the PMOS transistor 40, and the other end of the first resistance R1 is connected between the gate of the PMOS transistor 40 and the drain of the NMOS transistor 50. Therefore, after the self-lock power supply circuit 100 is assembled, the drain of the PMOS transistor 40 is in a high potential state due to the normally closed characteristics of the NMOS transistor 50, which closes the PMOS transistor 40 and prevents the battery 10 from discharging. At the same time, as long as a high potential signal is provided to the mode switch end S, the PMOS transistor 40 can be turned on, and the battery 10 can start to supply power.

[0016] Please continue to refer to the Figure 1 In order to more conveniently switch the power supply state of the battery 10, the self-lock power supply circuit 100 further contains an external power supply 60, a voltage stabilizer L1, a diode D1 and a microcontroller 30. The voltage stabilizer L1 is connected to the output end O to output a suitable voltage, and the external power supply 60 is connected between the output end O and the voltage stabilizer L1. The negative electrode of the diode D1 is connected to the output end O, and the positive electrode of the diode D1 is electrically connected to the external power supply 60, so as to ensure that the loop between the external power supply 60 and the source of the PMOS transistor 40 and the loop between the external power supply 60 and the voltage stabilizer L1 are both unidirectionally conducted. The input end IN, EN of the voltage stabilizer L1 is electrically connected to the output end O, and the voltage stabilizer L1 contains an output end Vout to provide a suitable voltage for a load. The microcontroller 30 is provided with a user interface and an output pin 31, and is connected between the output end Vout and the mode switch end S.

[0017] With the above configuration, the microcontroller 30 can be powered by the battery 10, and by the external power supply 60 when the battery 10 is turned off. Therefore, during product assembly and testing, the microcontroller 30 can be controlled through the user interface to provide a high-voltage signal to the mode switch terminal S, ensuring continuous power from the battery 10. After product assembly and testing are complete, the microcontroller 30 can be controlled through the user interface to provide a low-voltage signal to the mode switch terminal S to stop powering the battery 10, preventing the battery 10 from depleting during product shipment. When the product is delivered to the end user, the external power supply 60 can be reconnected and the microcontroller 30 can be controlled through the user interface to provide a high-voltage signal to the mode switch terminal S, allowing the battery 10 to continue supplying power to the microcontroller 30.

[0018] In this embodiment, the self-locking power supply circuit 100 includes a second resistor R2, a first element A1, and a second element A2. One end of the second resistor R2 is connected between the voltage regulator L1 and the microcontroller 30, and the other end of the second resistor R2 is connected between the microcontroller 30 and the mode switch terminal S to reduce the current intensity flowing to the mode switch terminal S and ensure smooth operation of the circuit. One end of the first element A1 is electrically connected between the output terminal O and the input terminals IN and EN of the voltage regulator L1, and the other end of the first element A1 is grounded to filter out current noise. The first element A1 can be a capacitor or a circuit with similar functions, such as a filter. One end of the second element A2 is electrically connected between the second resistor R2 and the microcontroller 30, and the other end of the second element A2 is grounded to filter out current noise flowing from the voltage regulator L1 to the microcontroller 30. The second element A2 can be a capacitor or a circuit with similar functions, such as a filter.

[0019] In summary, the self-locking power supply circuit 100 of the present invention adds a PMOS transistor 40 and an NMOS transistor 50 to the battery power supply path. By outputting signals of different levels from the microcontroller 30, turning on the transistors enables the power supply path of the battery 10, while turning off the transistors disconnects the power supply path of the battery 10. This saves power consumption during the post-factory shipping period. At the same time, consumers can easily unlock the battery when using the electronic device for the first time, providing a simpler user experience.

[0020] Although the present invention has been disclosed above with reference to the embodiments, they are not intended to limit the present invention. Anyone with ordinary skill in the art may make slight changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A self-locking power supply circuit, characterized in that: The invention comprises: a battery; a ground terminal; an output terminal; a mode switch terminal; a PMOS transistor including a source electrically connected to the output terminal, a drain electrically connected to the battery, and a gate; an NMOS transistor including a source electrically connected to the ground terminal, a drain electrically connected to the gate of the PMOS transistor, and a gate electrically connected to the mode switch terminal; and a resistor, one end of the resistor is connected between the battery and the drain of the PMOS transistor, and the other end of the resistor is connected between the gate of the PMOS transistor and the drain of the NMOS transistor.

2. The self-locking power supply circuit according to claim 1, wherein: The invention further comprises an external power supply connected to the output terminal; and a microcontroller connected to the output terminal and having an output pin electrically connected to the mode switch terminal.

3. The self-locking power supply circuit according to claim 2, wherein: A cathode of a diode is connected to the output end, and an anode of the diode is electrically connected to the external power supply.

4. The self-locking power supply circuit according to claim 2, wherein: A voltage regulator is connected between the output end and the microcontroller, the input end of the voltage regulator is electrically connected to the output end, and the output end of the voltage regulator is electrically connected to the microcontroller.

5. The self-locking power supply circuit according to claim 4, wherein: One end of a second resistor is connected between the voltage regulator and the microcontroller, and the other end of the second resistor is connected between the microcontroller and the mode switch terminal.

6. The self-locking power supply circuit according to claim 5, wherein: One end of a first element is electrically connected between the output end and the input end of the voltage regulator, the other end of the first element is grounded, and the first element is a capacitor.

7. The self-locking power supply circuit according to claim 6, wherein: One end of a second element is electrically connected between the second resistor and the microcontroller, and the other end of the second element is grounded. The second element is a capacitor.

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