CN204350071U - A kind of mobile phone earphone interface power-supply circuit - Google Patents

Abstract

The utility model discloses a kind of mobile phone earphone interface power-supply circuit, the drive circuit comprising earphone detection circuit, the audio frequency transformer circuit be connected with described earphone detection circuit, the metal-oxide-semiconductor rectification circuit be connected with described audio frequency transformer circuit and be connected with described metal-oxide-semiconductor rectification circuit, described earphone detection circuit is used for peripheral hardware accessory and earphone interface being carried out adaptation and audio signal being inputted from described earphone interface; Audio frequency transformer circuit for receiving the audio signal of described earphone detection circuit input, and boosts to the sine wave received; Metal-oxide-semiconductor rectification circuit is used for the AC signal after by boosting and becomes direct current signal; The direct current signal that drive circuit is used for described metal-oxide-semiconductor rectification circuit exports carries out the last output dc voltage of voltage stabilizing.The utility model circuit is simple, and directly can produce audio signal with mobile phone can power, practical.

Description

A mobile phone earphone port power-taking circuit

technical field

The utility model belongs to a circuit.

Background technique

Most of the existing embedded mobile phone audio port accessories are powered by batteries, which is inconvenient to use. The audio interface is more standardized than the OTG (On-The-GO) interface. The audio port power supply has a wide range of applications. OTG power supply needs to support the chip hardware support of OTG function. , the system cost is high.

Utility model content

The purpose of the utility model is to overcome the shortcomings of the above-mentioned prior art, and provide a kind of power supply circuit suitable for a variety of mobile phone power supply solutions and strong compatibility with the earphone port of the mobile phone.

In order to achieve the above object, the utility model adopts the following technical solutions:

A mobile phone earphone port power-taking circuit, comprising

An earphone detection circuit, the earphone detection circuit is used to adapt the peripheral accessories to the earphone jack and input the audio signal from the earphone jack;

An audio transformer circuit connected to the earphone detection circuit, the audio transformer circuit is used to receive the audio signal input by the earphone detection circuit, and boost the received sine wave;

A MOS tube rectifier circuit connected to the audio transformer circuit, the MOS tube rectifier circuit is used to change the boosted AC signal into a DC signal;

A drive circuit connected to the MOS tube rectifier circuit, the drive circuit is used to stabilize the DC signal output by the MOS tube rectifier circuit and finally output a DC voltage.

The earphone detection circuit includes four sections of earphone jacks, a first resistor, a first capacitor, a second resistor and a second capacitor, and the 3 pins of the earphone jack are respectively connected to the first resistor, one end of the first capacitor and the audio transformer circuit, the other end of the first resistor and the first capacitor are grounded, the 2 pins of the earphone interface are respectively connected to one end of the second resistor and the second capacitor, and the other end of the second resistor and the second capacitor is grounded , pin 4 of the headphone jack is grounded.

The audio transformer circuit includes a transformer, the same-named end of the primary winding of the transformer is connected to the earphone detection circuit, the different-named end of the primary winding is grounded, and the same-named end and the different-named end of the secondary winding are connected to the MOS tube rectifier circuit.

The MOS tube rectifier circuit includes a first P-type MOS tube, a first N-type MOS tube, a second N-type MOS tube and a second P-type MOS tube, and the secondary winding end of the transformer is connected to the first P-type MOS tube with the same name. The drain and gate of the MOS transistor, the drain of the first N-type MOS transistor, and the gate of the second N-type MOS transistor; the secondary winding end of the transformer is connected to the gate of the second P-type MOS transistor and the drain, the gate of the first N-type MOS transistor and the drain of the second N-type MOS transistor; the source of the first P-type MOS transistor and the source of the second P-type MOS transistor are connected to the drive circuit, and the first The source of one N-type MOS transistor and the source of the second N-type MOS transistor are grounded.

The driving circuit includes a voltage regulator, a diode, a third capacitor, a fourth capacitor, a fifth capacitor, a first electrolytic capacitor and a second electrolytic capacitor;

The input terminals of the voltage regulator are respectively connected to the cathode of the diode, one end of the third capacitor and the fourth capacitor and the anode of the first electrolytic capacitor, the other end of the third capacitor and the fourth capacitor and the first The cathode of the electrolytic capacitor is grounded, and the anode of the diode is connected to the MOS tube rectifier circuit;

The output terminal of the voltage stabilizer is respectively connected to the anode of the second electrolytic capacitor and one end of the fifth capacitor, the cathode of the second electrolytic capacitor and the other end of the fifth capacitor are grounded; the ground terminal of the voltage stabilizer grounded.

After adopting the above technical solution, the utility model has the following advantages compared with the prior art:

1. Through the solution of the utility model, the mobile phone can be directly used to generate audio signals to provide power without batteries.

2. All devices with audio ports can use this solution to supply power to peripherals.

3. The circuit is simple and does not require too much software support. It is suitable for a variety of mobile phone power supply solutions and has strong compatibility.

Description of drawings

Fig. 1 is the circuit composition schematic diagram of the present utility model;

Fig. 2 is the circuit diagram of earphone detection circuit;

Fig. 3 is the circuit diagram of audio transformer circuit;

Fig. 4 is the circuit diagram of MOS tube rectification circuit;

Fig. 5 is the circuit diagram of driving circuit;

detailed description

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

As shown in FIG. 1 , a mobile phone earphone port power-taking circuit includes an earphone detection circuit 1 , an audio transformer circuit 2 , a MOS tube rectifier circuit 3 and a drive circuit 4 connected in sequence.

As shown in Figure 2, the earphone detection circuit 1 includes four sections of earphone jack J24, a first resistor R127, a first capacitor C117, a second resistor R128 and a second capacitor C127, and the 3 pins of the earphone jack J24 are respectively connected to the pins of the first resistor R127 One end, one end of the first capacitor C117 and the audio transformer circuit 2, the first resistor R127 and the other end of the first capacitor C117 are grounded, the 2 pins of the earphone interface J24 are respectively connected to the second resistor R128 and one end of the second capacitor C127, and the second The other end of the resistor R128 and the second capacitor C127 is grounded, and pin 4 of the earphone jack J24 is grounded.

The earphone detection circuit 1 is used to adapt the peripheral accessories to the earphone jack J24, the audio signal is input from the earphone jack J24, and the 22kHz sine wave audio signal generated by the mobile app is transmitted to the audio transformer circuit 2.

As shown in FIG. 3 , the audio transformer circuit 2 includes a transformer L3, the end of the same name of the primary winding of the transformer L3 is connected to the headphone detection circuit 1, the end of the same name of the primary winding is grounded, and the end of the same name of the secondary winding is connected to the MP_G2 end. The opposite end of the secondary winding is connected to the MP_G1 end, and is connected to the MOS tube rectifier circuit 3 through the MP_G2 end and the MP_G1 end.

The 22kHz sine wave signal is input from the earphone detection circuit 1 to the audio transformer circuit 2, and the sine wave is boosted by the transformer L3, and the boosted signal is output to the MOS tube rectifier circuit 3.

As shown in Figure 4, the MOS transistor rectifier circuit 3 includes a first P-type MOS transistor Q5, a first N-type MOS transistor Q6, a second N-type MOS transistor Q7, and a second P-type MOS transistor Q8, and the MP_G2 terminal is connected to the first P The drain and gate of the N-type MOS transistor Q5, the drain of the first N-type MOS transistor Q6, and the gate of the second N-type MOS transistor Q7; the MP_G1 terminal is connected to the gate and drain of the second P-type MOS transistor Q8, The gate of the first N-type MOS transistor Q6 and the drain of the second N-type MOS transistor Q7; the source of the first P-type MOS transistor Q5 and the source of the second P-type MOS transistor Q8 are connected to the VOUT terminal, through the VOUT terminal The driving circuit 4 is connected, and the source of the first N-type MOS transistor Q6 and the source of the second N-type MOS transistor Q7 are grounded.

The boosted signal passes through the MOS tube rectifier circuit 3 to convert the AC signal into a DC signal.

As shown in Figure 5, the driving circuit 4 includes a voltage regulator U24, a diode D9, a third capacitor C118, a fourth capacitor C119, a fifth capacitor C122, a first electrolytic capacitor C120 and a second electrolytic capacitor C121, and the voltage regulator U24 The input terminal VIN is respectively connected to the cathode of the diode D9, the third capacitor C118, the fourth capacitor C119 and the anode of the first electrolytic capacitor C120, and the other end of the third capacitor C118, the fourth capacitor C119 and the cathode of the first electrolytic capacitor C120 are grounded; The output terminal VOUT of the voltage regulator U24 is respectively connected to the anode of the second electrolytic capacitor C121 and one end of the fifth capacitor C122, the cathode of the second electrolytic capacitor C121 and the other end of the fifth capacitor C122 are grounded; the ground terminal GND of the voltage regulator U24 Grounded; the anode of the diode D9 is connected to the MOS tube rectifier circuit 3 through the VOUT port.

The DC signal output by the MOS tube rectifier circuit 3 is filtered by the diode D9 and input to the voltage regulator U24, and finally outputs a DC voltage of 3.3V, so that it can supply power to peripheral accessories, and realizes the power supply can be directly generated by the mobile phone without the need Battery.

The above is only a preferred embodiment of the utility model, but the scope of protection of the utility model is not limited thereto, and any person familiar with the technical field can easily think of All changes or replacements should fall within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims (5)

1. a mobile phone earphone interface power-supply circuit, is characterized in that: comprise

Earphone detection circuit, described earphone detection circuit is used for peripheral hardware accessory and earphone interface being carried out adaptation and audio signal being inputted from described earphone interface;

The audio frequency transformer circuit be connected with described earphone detection circuit, described audio frequency transformer circuit for receiving the audio signal of described earphone detection circuit input, and boosts to the sine wave received;

The metal-oxide-semiconductor rectification circuit be connected with described audio frequency transformer circuit, described metal-oxide-semiconductor rectification circuit is used for the AC signal after by boosting and becomes direct current signal;

The drive circuit be connected with described metal-oxide-semiconductor rectification circuit, the direct current signal that described drive circuit is used for described metal-oxide-semiconductor rectification circuit exports carries out the last output dc voltage of voltage stabilizing.

2. a kind of mobile phone earphone interface power-supply circuit according to claim 1, it is characterized in that: described earphone detection circuit comprises four sections of earphone interfaces, first resistance, first electric capacity, second resistance and the second electric capacity, 3 pin of described earphone interface connect the first resistance respectively, one end of first electric capacity and described audio frequency transformer circuit, the other end ground connection of described first resistance and the first electric capacity, 2 pin of described earphone interface connect one end of described second resistance and the second electric capacity respectively, the other end ground connection of described second resistance and the second electric capacity, 4 pin ground connection of described earphone interface.

3. a kind of mobile phone earphone interface power-supply circuit according to claim 2, it is characterized in that: described audio frequency transformer circuit comprises a transformer, the Same Name of Ends of the primary winding of described transformer connects described earphone detection circuit, the different name end ground connection of its primary winding, the Same Name of Ends of secondary winding transformer is connected described metal-oxide-semiconductor rectification circuit with different name end.

4. a kind of mobile phone earphone interface power-supply circuit according to claim 3, it is characterized in that: described metal-oxide-semiconductor rectification circuit comprises a P type metal-oxide-semiconductor, the first N-type metal-oxide-semiconductor, the second N-type metal-oxide-semiconductor and the 2nd P type metal-oxide-semiconductor, the secondary winding transformer Same Name of Ends of described transformer connects the grid of the drain and gate of a P type metal-oxide-semiconductor, the drain electrode of the first N-type metal-oxide-semiconductor and the second N-type metal-oxide-semiconductor; The secondary winding transformer different name end of described transformer connects grid and drain electrode, the grid of the first N-type metal-oxide-semiconductor and the drain electrode of the second N-type metal-oxide-semiconductor of the 2nd P type metal-oxide-semiconductor; The source electrode of the one P type metal-oxide-semiconductor and the source electrode of the 2nd P type metal-oxide-semiconductor connect described drive circuit, the source electrode of the first N-type metal-oxide-semiconductor and the source ground of the second N-type metal-oxide-semiconductor.

5. a kind of mobile phone earphone interface power-supply circuit according to claim 4, is characterized in that: described drive circuit comprises pressurizer, diode, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the first electrochemical capacitor and the second electrochemical capacitor;

The input of described pressurizer connects the negative electrode of described diode, the 3rd electric capacity and one end of the 4th electric capacity and the anode of the first electrochemical capacitor respectively, the other end of described 3rd electric capacity and the 4th electric capacity and the minus earth of described first electrochemical capacitor, the anode of described diode connects described metal-oxide-semiconductor rectification circuit;

The output of described pressurizer connects the anode of the second electrochemical capacitor and one end of the 5th electric capacity respectively, the negative electrode of described second electrochemical capacitor and the other end ground connection of described 5th electric capacity; The earth terminal ground connection of described pressurizer.