CN219370335U

CN219370335U - Type-C interface device detection circuit

Info

Publication number: CN219370335U
Application number: CN202320579781.9U
Authority: CN
Inventors: 路国强
Original assignee: Shenzhen Tong Tai Yi Information Technology Co ltd
Current assignee: Shenzhen Tong Tai Yi Information Technology Co ltd
Priority date: 2023-03-15
Filing date: 2023-03-15
Publication date: 2023-07-18
Anticipated expiration: 2033-03-15

Abstract

The utility model discloses a Type-C interface device detection circuit, which comprises: the device comprises a Type-C interface module, a backflow prevention module and an interrupt triggering module; the Type-C interface module comprises a signal input end, one end of the backflow prevention module is connected with the signal input end, and the other end of the backflow prevention module is connected with the interrupt triggering module; the interrupt triggering module comprises a switching tube Q1 and a switching tube Q2, and a grid electrode of the switching tube Q1 is externally connected with a power supply VDD; the drains of the switching tube Q1 and the switching tube Q2 are respectively connected with a pull-up resistor R4 and a pull-up resistor R5, the grid electrode of the switching tube Q2 is connected between the drain electrode of the switching tube Q1 and the pull-up resistor R4, the sources of the switching tube Q1 and the switching tube Q2 are grounded, and the detection module of the electronic product is connected between the drain electrode of the switching tube Q2 and the pull-up resistor R5. Through the setting of Type-C interface module, anti-backflow module and interrupt trigger module, can trigger electronic equipment's detection mechanism, realize equipment's input inspection, technical scheme simple structure, with low costs have brought very big facility for the production of partial electronic product.

Description

Type-C interface device detection circuit

Technical Field

The utility model relates to the technical field of Type-C interfaces, in particular to a Type-C interface device detection circuit.

Background

With the rapid development of electronic technology, the Type-C interface is also increasingly widely used. In general, devices for detecting Type-C interfaces often require the addition of CC logic control chips, such as power adapters, tablets, cell phones, and the like. For electronic equipment with lower power consumption and no need of detecting current capability, such as headphones, U disk, mouse and the like, the technical scheme of adopting the CC logic detection and port control chip clearly greatly increases the production cost of the product.

Disclosure of Invention

In view of the foregoing, it is necessary to provide a Type-C interface device detection circuit to solve the problem of high Type-C interface detection cost of some electronic devices.

In order to achieve the above purpose, the technical scheme of the utility model is as follows: a Type-C interface device detection circuit, comprising: the device comprises a Type-C interface module, a backflow prevention module and an interrupt triggering module;

the Type-C interface module comprises a signal input end, one end of the backflow prevention module is connected with the signal input end, and the other end of the backflow prevention module is connected with the interrupt triggering module;

the anti-backflow module is used for preventing the offset voltage at the signal input end from causing misjudgment of the interrupt triggering module, and the interrupt triggering module is used for triggering the detection module of the electronic product;

the interrupt triggering module comprises a switching tube Q1 and a switching tube Q2, and a grid electrode of the switching tube Q1 is externally connected with a power supply VDD;

the drains of the switching tube Q1 and the switching tube Q2 are respectively connected with a pull-up resistor R4 and a pull-up resistor R5, the grid electrode of the switching tube Q2 is connected between the drain electrode of the switching tube Q1 and the pull-up resistor R4, the sources of the switching tube Q1 and the switching tube Q2 are grounded, and the detection module of the electronic product is connected between the drain electrode of the switching tube Q2 and the pull-up resistor R5.

In the Type-C interface device detection circuit, the backflow prevention module comprises a diode D1 and a diode D2, cathodes of the diode D1 and the diode D2 are respectively connected with a signal input end, and anodes of the diode D1 and the diode D2 are connected in parallel and then connected to a gate of a switching tube Q1.

In the Type-C interface device detection circuit, a switching tube Q1 and a switching tube Q2 are NMOS tubes.

The detection circuit of the Type-C interface device further comprises a delay circuit module, wherein the delay circuit module is connected between the backflow prevention module and the interrupt triggering module.

In the Type-C interface device detection circuit, a delay circuit module comprises a resistor R3 and a capacitor C1; one end of the resistor R3 is connected with the backflow prevention module, and the other end of the resistor R3 is connected to the grid electrode of the switching tube Q1; one end of the capacitor C1 is connected between the resistor R3 and the grid electrode of the switch tube Q1, and the other end is grounded.

The detection circuit of the Type-C interface device further comprises a voltage division module, and the voltage division module is connected between the backflow prevention module and the delay module.

In the detection circuit of the Type-C interface device, the voltage division module comprises a resistor R1 and a resistor R2, one ends of the resistor R1 and the resistor R2 are connected between the backflow prevention module and the interruption triggering module, the other end of the resistor R1 is externally connected with a power supply VDD, and the other end of the resistor R2 is grounded.

In the Type-C interface device detection circuit, an interrupt signal of the interrupt trigger module is triggered at a low level.

In the Type-C interface device detection circuit, under the condition that electronic equipment is connected, an input signal of a signal input end defaults to a low-level signal.

Through the technical scheme, the utility model has the following beneficial effects:

according to the utility model, through the arrangement of the Type-C interface module, the backflow prevention module and the interruption triggering module, when no electronic equipment is connected, an external power supply VDD supplies power to the switching tube Q1, so that the grid electrode of the switching tube Q1 exceeds a threshold voltage to keep a conducting state, the conducting state of the switching tube Q1 pulls down the bias voltage provided by a pull-up resistor R4 to the switching tube Q2, so that the switching tube Q2 is in a cut-off state, and an interruption signal of the interruption triggering module is in a high level under the action of the pull-up resistor R5;

when the electronic equipment is connected, the voltage of the switching tube Q1 is pulled down, the switching tube Q1 is cut off, the pull-up resistor R4 is biased to reach the gate threshold voltage of the switching tube Q2, the switching tube Q2 is saturated and is conducted, the interrupt signal of the interrupt triggering module is changed into a low level, and therefore the detection mechanism of the electronic equipment can be triggered, the input inspection of the equipment is realized, and the switching and the output of the control mode are carried out. The technical scheme has the advantages of simple circuit structure and low cost, does not need to additionally increase a special detection chip, and brings great convenience to the production of partial electronic products.

Drawings

FIG. 1 is a flow diagram of an embodiment of the present utility model;

fig. 2 is a circuit schematic of an embodiment of the present utility model.

100. Type-C interface module; 200. an anti-backflow module; 300. an interrupt triggering module; 400. a delay circuit module; 500. and the voltage dividing module.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, the following describes a Type-C interface device detection circuit in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

Referring to fig. 1-2, a Type-C interface device detection circuit includes: the device comprises a Type-C interface module, a backflow prevention module and an interrupt triggering module; the Type-C interface module comprises a signal input end, one end of the backflow prevention module is connected with the signal input end, and the other end of the backflow prevention module is connected with the interrupt triggering module; the anti-backflow module is used for preventing the offset voltage at the signal input end from causing misjudgment of the interrupt triggering module, and the interrupt triggering module is used for triggering the detection module of the electronic product; the interrupt triggering module comprises a switching tube Q1 and a switching tube Q2, and a grid electrode of the switching tube Q1 is externally connected with a power supply VDD; the drains of the switching tube Q1 and the switching tube Q2 are respectively connected with a pull-up resistor R4 and a pull-up resistor R5, the grid electrode of the switching tube Q2 is connected between the drain electrode of the switching tube Q1 and the pull-up resistor R4, the sources of the switching tube Q1 and the switching tube Q2 are grounded, and the detection module of the electronic product is connected between the drain electrode of the switching tube Q2 and the pull-up resistor R5.

The technical scheme has the advantages of simple circuit structure and low cost, does not need to additionally increase a special detection chip, and brings great convenience to the production of partial electronic products. The problem of product production cost caused by the adoption of a CC logic detection and port control chip in some electronic equipment with lower power consumption and no need of current detection capability, such as an earphone, a U disk, a mouse and the like, is avoided. It can be appreciated that the CC logic control chip is a USB Type-C port controller, supporting the latest USB Type-C2.1 specification, integrating CC logic detection, whose CC logic blocks monitor the level changes on the CC1 and CC2 pins to determine when a USB port is connected, the direction of the cable, and the role detected.

IN this embodiment, taking a Type-C interface earphone as an example, the Type-C interface module includes signal input ends IN1, IN2, IN1 and IN2 terminating a CC or SUB signal, when no Type-C earphone is connected, an external power supply VDD supplies power to the switching tube Q1, so that the gate of the switching tube Q1 exceeds a threshold voltage to maintain a conducting state, the conducting state of the switching tube Q1 pulls down a bias voltage provided by a pull-up resistor R4 to the switching tube Q2, so that the switching tube Q2 is IN a cut-off state, and an interrupt signal cdc_hs_det of the interrupt triggering module is at a high level under the action of the pull-up resistor R5;

when the Type-C earphone is connected, the voltage of the switching tube Q1 is pulled down, the switching tube Q1 is cut off, the pull-up resistor R4 is biased to reach the gate threshold voltage of the switching tube Q2, the switching tube Q2 is saturated and conducted, the interrupt signal of the interrupt triggering module is changed into a low level, and therefore a detection mechanism of the earphone can be triggered, input inspection of the Type-C audio equipment is achieved, and the output mode of the module is controlled and switched.

In this embodiment, the anti-backflow module includes a diode D1 and a diode D2, wherein cathodes of the diode D1 and the diode D2 are respectively connected with the signal input end, and anodes of the diode D1 and the diode D2 are connected in parallel and then connected to a gate of the switching tube Q1. When the bias voltage exists at the signal input end, misjudgment is easily caused to occur to the interrupt triggering module, namely, the switch tube Q1 is touched by mistake, and the bias voltage cannot pass through the backflow preventing module through the arrangement of the diode D1 and the diode D2, so that the accuracy of the circuit is enhanced.

Preferably, the switching tube Q1 and the switching tube Q2 are NMOS tubes, and the normal operation of the switching tube Q1 and the switching tube Q2 is not affected under the arrangement of the backflow prevention module because the grid electrode of the NMOS tube needs to be added with negative voltage.

In this embodiment, still include delay circuit module, delay circuit module connects between preventing flowing backward module and interrupt trigger module, and delay circuit module can prevent that the too big voltage from causing prevents flowing backward module to take place to damage.

Further, the delay circuit module comprises a resistor R3 and a capacitor C1; one end of the resistor R3 is connected with the backflow prevention module, and the other end of the resistor R3 is connected to the grid electrode of the switching tube Q1; one end of the capacitor C1 is connected between the resistor R3 and the grid electrode of the switch tube Q1, and the other end is grounded. The resistor R3 can charge the capacitor C1, and power is supplied to the switching tube Q1 after the capacitor C1 is charged, so that the safety of the circuit is greatly enhanced. Specifically, the resistor R3 and the capacitor C1 may be selected to match according to the conduction value, breakdown value, and other parameters of the switching tube Q1.

In this embodiment, the device further includes a voltage dividing module, and the voltage dividing module is connected between the backflow preventing module and the delay module. Further, the voltage dividing module comprises a resistor R1 and a resistor R2, one ends of the resistor R1 and the resistor R2 are connected between the backflow preventing module and the interruption triggering module, the other end of the resistor R1 is externally connected with a power supply VDD, and the other end of the resistor R2 is grounded. The voltage dividing module can play a role in limiting and dividing voltage, and the resistance values of the resistor R1 and the resistor R2 can be selected and matched according to the types of the switching tube Q1 and the switching tube Q1.

In this embodiment, the interrupt signal of the interrupt trigger module is triggered at a low level, when no electronic device, such as a Type-C earphone, is accessed, the interrupt signal is at a high level, when the Type-C earphone is accessed, the interrupt signal becomes at a low level, and an earphone detection mechanism can be triggered, so that input inspection of the Type-C audio device is realized, and further, the output mode of the module is controlled and switched.

In this embodiment, in the state where the electronic device is connected, the input signal at the signal input end defaults to a low level signal, so that the voltage of the switching tube Q1 is pulled down, the switching tube Q1 is turned off, the pull-up resistor R4 biases to reach the gate threshold voltage of the switching tube Q2, so that the switching tube Q2 is saturated and turned on, and the interrupt signal of the interrupt triggering module becomes a low level, thereby triggering the detection mechanism of the electronic device.

The present utility model is not described in detail in the present application, and is well known to those skilled in the art.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. Type-C interface device detection circuitry, characterized in that includes: the device comprises a Type-C interface module (100), a backflow prevention module (200) and an interrupt trigger module (300);

the Type-C interface module (100) comprises a signal input end, one end of the backflow prevention module (200) is connected with the signal input end, and the other end of the backflow prevention module is connected with the interrupt trigger module (300);

the anti-backflow module (200) is used for preventing misjudgment of the interrupt triggering module (300) caused by the existence of bias voltage at the signal input end, and the interrupt triggering module (300) is used for triggering a detection module of an electronic product;

the interrupt triggering module (300) comprises a switching tube Q1 and a switching tube Q2, wherein the grid electrode of the switching tube Q1 is externally connected with a power supply VDD;

the drain electrode of the switch tube Q1 and the drain electrode of the switch tube Q2 are respectively connected with a pull-up resistor R4 and a pull-up resistor R5, the grid electrode of the switch tube Q2 is connected between the drain electrode of the switch tube Q1 and the pull-up resistor R4, the source electrodes of the switch tube Q1 and the switch tube Q2 are grounded, and the detection module of the electronic product is connected between the drain electrode of the switch tube Q2 and the pull-up resistor R5.

2. The Type-C interface device detection circuit according to claim 1, wherein the anti-backflow module (200) comprises a diode D1 and a diode D2, wherein cathodes of the diode D1 and the diode D2 are respectively connected with the signal input terminal, and anodes of the diode D1 and the diode D2 are connected in parallel and then connected to a gate of the switching tube Q1.

3. The Type-C interface device detection circuit of claim 2, wherein the switching tube Q1 and the switching tube Q2 are NMOS tubes.

4. The Type-C interface device detection circuit of claim 1, further comprising a delay circuit module (400), wherein the delay circuit module (400) is connected between the anti-backflow module (200) and the interrupt trigger module (300).

5. The Type-C interface device detection circuit of claim 4, wherein the delay circuit module (400) comprises a resistor R3 and a capacitor C1;

one end of the resistor R3 is connected with the backflow prevention module (200), and the other end of the resistor R3 is connected to the grid electrode of the switching tube Q1;

one end of the capacitor C1 is connected between the resistor R3 and the grid electrode of the switch tube Q1, and the other end of the capacitor C is grounded.

6. The Type-C interface device detection circuit of claim 4, further comprising a voltage division module (500), wherein the voltage division module (500) is connected between the anti-backflow module (200) and the delay circuit module (400).

7. The Type-C interface device detection circuit according to claim 6, wherein the voltage dividing module (500) includes a resistor R1 and a resistor R2, one ends of the resistor R1 and the resistor R2 are both connected between the anti-backflow module (200) and the interrupt trigger module (300), the other end of the resistor R1 is externally connected with a power supply VDD, and the other end of the resistor R2 is grounded.

8. The Type-C interface device detection circuit of claim 1, wherein the interrupt signal of the interrupt trigger module (300) is a low level trigger.

9. The Type-C interface device detection circuit of claim 1, wherein the input signal at the signal input terminal defaults to a low signal when the electronic device is in an on state.