CN218276095U

CN218276095U - Charging interface capable of directly measuring battery voltage of charging box

Info

Publication number: CN218276095U
Application number: CN202220981905.1U
Authority: CN
Inventors: 陈树康; 黄建军; 陈海裕; 张佑斌
Original assignee: Dongguan City Hele Electronic Co ltd
Current assignee: Dongguan City Hele Electronic Co ltd
Priority date: 2022-04-25
Filing date: 2022-04-25
Publication date: 2023-01-10
Anticipated expiration: 2032-04-25

Abstract

The utility model discloses a but interface that charges of direct measurement charging box battery voltage sets up the interface that charges on the charging box and adopts the USB interface, and it includes at least: the group of charging pins, the first communication pin and the second communication pin are connected with the first communication pin and the drain electrode of an NMOS tube, the source electrode of the NMOS tube is connected with a battery in the charging box, and the base electrode of the NMOS tube is connected with the second communication pin. The utility model discloses an interface that charges lets first communication pin and the interior battery formation of charging box switch when the circuit design, and second communication pin is as a switch controller, in finished product quality testing stage, at the high level of second communication pin department input, makes first communication pin and battery intercommunication, and the voltage of the interior battery of charging box just can be acquireed to the voltage of the department of this moment direct measurement first communication pin.

Description

Charging interface capable of directly measuring battery voltage of charging box

The technical field is as follows:

the utility model relates to a box product field that charges refers in particular to a but interface that charges of direct measurement charging box battery voltage.

Background art:

at present, more and more wireless Bluetooth headset products are in the headset market. The wireless Bluetooth headset is provided with a power supply battery, does not need an external power supply and is convenient to use. In order to facilitate charging for users, the wireless Bluetooth headset is usually matched with a charging box. The built-in rechargeable battery that has in the box that charges, after putting into the earphone box that charges, the box that charges can directly charge for wireless bluetooth earphone. Meanwhile, the charging box is provided with a charging interface and can be connected with an external power supply, and the charging box is charged by the external power supply.

After the production of the charging box is finished, in order to ensure the quality of a product, quality sampling inspection needs to be carried out, wherein one of the inspection items is to detect whether the voltage of a battery in the charging box is normal. Because the box that charges at this moment has assembled, moreover because the restriction of cost, the main control chip that adopts in the present box that charges does not all possess communication function usually, and the interface that charges also only adopts four pins, and the measurement personnel can't be directly through the interface that charges measurement charging box battery voltage, so must dismantle the box that charges usually, then use the voltage of universal meter direct measurement battery. The biggest problem of this method is that the charging box is damaged or even scrapped due to the fact that the charging box is assembled and produced at the moment, and the charging box is disassembled forcibly.

In view of the above, the present inventors propose the following.

The utility model has the following contents:

the utility model aims to solve the technical problem of overcoming the defects of the prior art, and provides a charging interface which can directly measure the voltage of a battery in a charging box without disassembly,

in order to solve the technical problem, the utility model discloses a following technical scheme: the utility model provides a can direct measurement interface that charges of box battery voltage, the interface that charges that sets up on the box that charges adopts the USB interface, and it includes at least: the charging device comprises a group of charging pins, a first communication pin and a second communication pin, wherein the first communication pin is connected with the drain electrode of an NMOS (N-channel metal oxide semiconductor) tube, the source electrode of the NMOS tube is connected with a battery in a charging box, and the base electrode of the NMOS tube is connected with the second communication pin.

Further, in the above technical solution, the first communication pin is connected to a first resistor; the second communication pin is connected with a second resistor.

Furthermore, in the above technical scheme, the charging interface adopts a TYPE-C interface, a CC1 pin in the TYPE-C interface is used as a first communication pin, and a CC2 pin in the TYPE-C interface is used as a second communication pin.

After the technical scheme is adopted, compared with the prior art, the utility model has following beneficial effect: the utility model discloses an interface that charges sets up a NMOS pipe between first communication pin and the second communication pin to being responsible for the communication originally when the circuit design, lets first communication pin and the interior battery formation switch of charging box, and second communication pin is as a switch controller. Therefore, when charging, the utility model discloses still usable a set of pin that charges to the battery, and at finished product quality testing stage, at second communication pin department input high level, make first communication pin and battery intercommunication, the voltage of the department of this moment with the universal meter direct measurement first communication pin just can acquire the voltage of the interior battery of charging box, and it is very convenient to use.

Description of the drawings:

fig. 1 is a circuit diagram of the present invention.

The specific implementation mode is as follows:

the present invention will be further described with reference to the following specific embodiments and accompanying drawings.

The utility model relates to a but the interface that charges of direct measurement charging box battery voltage, the utility model discloses can be applied to among the bluetooth headset charging box. The charging interface of the existing Bluetooth headset charging box usually adopts a USB interface, and due to cost limitation, the charging interface usually only uses four pins. As shown in fig. 1, the pins in the charging interface 1 at least include: a group of

charging pins

11 and 12, a first communication pin 13 and a second communication pin 14.

The

charging pins

11 and 12 are used for inputting 5V voltage into the charging box, and the NMOS tube 2 is connected with the first communication pin 13 and the second communication pin 14. The concrete connection mode is as follows: the first communication pin 13 is connected with the drain electrode of the NMOS tube 2, the source electrode of the NMOS tube 2 is connected with the battery 3 in the charging box, and the base electrode of the NMOS tube 2 is connected with the second communication pin 14. Thus, the first communication pin 13 forms a switch with the battery 3, and the second communication pin 14 forms a switch controller. When the voltage of the battery 3 needs to be detected, a high level can be input at the second communication pin 14, a conductive channel is established when the grid has positive voltage, the NMOS tube starts to work, the first communication pin 13 and the battery 3 are in a communicated state, the voltage at the position of the first communication pin 13 is directly measured by a universal meter at the moment, and the voltage of the battery 3 is equivalently measured, so that the voltage of the battery 3 in the charging box can be obtained, and the use is very convenient.

The charging interface 1 in the charging box at present usually adopts a TYPE-C interface, and the following description will take the TYPE-C interface as an example.

The TYPE-C interface has functions of both positive and negative insertion, so that the TYPE-C interface has 4 pairs of TX/RX pins, 2 pairs of USBD +/D-pins, a pair of SBU pins, 2 CC pins, 4 VBUS pins and 4 ground wires. Here 4 VBUS pins and 4 ground and 2 CC pins are used. Wherein VBUS pin and ground wire are used for the output and return of power, it constitutes the utility model discloses well charging

13, 14. 2. Each CC pin is used for the communication of the charging detection module, namely two CC pins in the TYPE-C interface are firstly used for judging the direction of plug insertion: and forward insertion or backward insertion, if the forward insertion is performed, the host uses the CC1 to communicate with the equipment, and the backward insertion uses the CC2.

Combine the utility model discloses, regard the CC1 pin in TYPE-C interface as first communication pin 13, regard the CC2 pin in TYPE-C interface as second communication pin 14. In order to be compatible with a charging protocol in the charging detection module, two resistors need to be connected to the first communication pin 13 and the second communication pin 14, specifically, the first communication pin 13 is connected to the first resistor 4; the second communication pin 14 is connected to a second resistor 5. The resistance of the two resistors is typically 5.1K ohms.

The utility model discloses use back in TYPE-C interface, in follow-up user use:

when the user uses a common and incompatible quick-charging charger. At this time, the first and second communication pins (i.e., the CC1 and CC2 pins in the TYPE-C interface) are in a floating state, the NMOS transistor 2 does not work, and the charger charges the charging box through any one set of

charging pins

13 and 14.

When the user uses the charger compatible with quick charging. At this time, after the charger can detect the resistance values of the first resistor 4 and the second resistor 5, the charger can perform quick charging for the charging box through any one group of

charging pins

13 and 14.

When the charging box is in the finished product detection stage, a high level can be input at the second communication pin 14 (namely CC 2), the NMOS tube 2 starts to work, and at the moment, the voltage at the first communication pin 13 (namely CC 1) is directly measured by a multimeter, and is equal to the voltage of the battery 3, so that the voltage of the battery 3 in the charging box can be obtained.

Of course, the above description is only for the specific embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent changes or modifications made by the structure, characteristics and principles according to the claims of the present invention should be included in the claims of the present invention.

Claims

1. The utility model provides a but interface that charges of direct measurement box battery voltage that charges, the interface that charges that sets up on the box that charges adopts the USB interface, its characterized in that: the interface that charges includes at least: the charging device comprises a group of charging pins, a first communication pin and a second communication pin, wherein the first communication pin is connected with the drain electrode of an NMOS (N-channel metal oxide semiconductor) tube, the source electrode of the NMOS tube is connected with a battery in a charging box, and the base electrode of the NMOS tube is connected with the second communication pin.

2. A charging interface for directly measuring the voltage of a battery in a charging box according to claim 1, wherein: the first communication pin is connected with a first resistor; the second communication pin is connected with a second resistor.

3. A charging interface for directly measuring the voltage of a battery in a charging box according to claim 1, wherein: the charging interface adopts a TYPE-C interface, a CC1 pin in the TYPE-C interface is used as a first communication pin, and a CC2 pin in the TYPE-C interface is used as a second communication pin.