CN213585149U

CN213585149U - Power supply short-circuit protection circuit

Info

Publication number: CN213585149U
Application number: CN202022591738.3U
Authority: CN
Inventors: 赵凯; 马国辉
Original assignee: Zhejiang Ruxin Intelligent Technology Co ltd
Current assignee: Zhejiang Ruxin Intelligent Technology Co ltd
Priority date: 2020-11-11
Filing date: 2020-11-11
Publication date: 2021-06-29
Anticipated expiration: 2030-11-11

Abstract

The utility model provides a power short-circuit protection circuit, include: the TF CARD socket comprises a TF CARD socket, a transistor and a load switch, wherein a VSS pin and a GND pin of the TF CARD socket are grounded, a VDD pin of the TF CARD socket is respectively connected with a VOUT pin of the load switch, a CARD _ DET pin of the TF CARD socket is respectively connected with an ON pin and a VIN pin of the load switch through the transistor, and the VDD pin of the TF CARD socket is grounded through a discharge resistor.

Description

Power supply short-circuit protection circuit

Technical Field

The utility model relates to a protection circuit field, in particular to power short-circuit protection circuit can be used to TF card protection.

Background

The TF card, also called as Micro SD card, is a very small flash memory card, which has the excellent characteristics of small volume, fast data transmission speed, hot-pluggable, etc., and is widely used in various portable devices, such as electronic dictionaries, mobile phones, digital cameras, car navigation systems.

In actual use, the TF card is easily damaged due to various reasons, and once the TF card is damaged, the file stored in the TF card is lost or the data transmission function is lost, thereby bringing great inconvenience to the use of the user. At present, most TF card protection circuits are only provided with TVS devices in circuit design to play a role of static electricity prevention, and protection measures such as short circuit, power-off power supply leakage and the like aiming at the circuit design of the TF card are not provided. Particularly, in the process of inserting the TF card after being pulled out of the circuit, the voltage remaining in the circuit after the TF card is pulled out is conducted to the TF card inserted again, and the situation that the power supply of the circuit is already in the on state before the TF card is powered on next time occurs, so that the TF card is damaged due to electrostatic damage.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a power short-circuit protection circuit increases down electric power bleeder circuit for the TF card on the basis of original circuit to reduce the TF card and receive electrostatic loss before the electricity once more, prolong the life of TF card.

In order to achieve the above object, the present technical solution provides a power supply short-circuit protection circuit, including: the TF CARD socket comprises a TF CARD socket, a transistor and a load switch, wherein a VSS pin and a GND pin of the TF CARD socket are grounded, a VDD pin of the TF CARD socket is respectively connected with a VOUT pin of the load switch, a CARD _ DET pin of the TF CARD socket is respectively connected with an ON pin and a VIN pin of the load switch through the transistor, and the VDD pin of the TF CARD socket is grounded through a leakage resistor.

In some embodiments, the QOD pin of the load switch is connected to a connection circuit of the VDD pin of the TF card socket and the VOUT pin of the load switch through a resistor.

In some embodiments, the transistor has a base connected to the CARD _ DET pin of the TF CARD socket, an emitter grounded, and a collector connected to the ON pin and VIN pin of the load switch, respectively.

In some embodiments, the GND pin and the CT pin of the load switch are grounded, and the VIN pin of the load switch is grounded through a capacitor.

In some embodiments, a resistor and a diode are arranged on a connection circuit of the CARD _ DET pin of the TF CARD socket and the transistor connection.

In some embodiments, the TF card socket connects the first transient diode and the second transient diode.

In some embodiments, the CMD pin, the DATA2 pin, the CLK pin, and the DATA3 pin of the TF card socket are respectively connected to the four interfaces of the first transient diode, and the first transient diode is grounded.

In some embodiments, the DATA0 pin, the DATA1 pin, and the CARD _ DET pin of the TF CARD socket are respectively connected to three interfaces of the second transient diode, and the second transient diode is grounded.

In some embodiments, a resistor is disposed on a connection circuit of the TF card socket and the first transient diode and the second transient diode.

Compared with the prior art, the technical scheme has the following characteristics and beneficial effects: the power-off power supply is released through circuit signal change, when the TF card is pulled out of the TF card socket, the processing chip acquires that the pin level is increased, the trigger transistor is conducted to close the load switch, and capacitor residual voltage of the circuit is released through the circuit, so that the TF card is ensured to be uncharged when being inserted into a corresponding TF card socket next time, and the TF card is protected from being lost.

Drawings

Fig. 1 is a partial schematic diagram of an overvoltage protection circuit suitable for TF according to an embodiment of the present invention, in which a circuit structure of a TF card socket is shown.

Fig. 2 is a partial schematic diagram of an overvoltage protection circuit for TF according to an embodiment of the present invention, the circuit shown in fig. 2 being connected to the circuit shown in fig. 1.

Fig. 3 is a partial schematic diagram of an overvoltage protection circuit suitable for TF according to an embodiment of the present invention, the circuit shown in fig. 3 is connected to the circuit shown in fig. 1

Fig. 4 is a partial schematic diagram of an overvoltage protection circuit for TF according to an embodiment of the present invention, the circuit shown in fig. 4 being connected to the circuit shown in fig. 1.

In the figure: the circuit comprises a 10-TF card socket, 21-a first transient diode, 22-a second transient diode, 30-a load switch, 40-a transistor and 50-a bleeder resistor.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art all belong to the protection scope of the present invention.

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in a generic and descriptive sense only and not for purposes of limitation, as the terms are used in the description to indicate that the referenced device or element must have the specified orientation, be constructed and operated in the specified orientation, and not for the purposes of limitation.

It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.

Because the circuit diagram related to the scheme is overlarge, the circuit diagram is divided into four spliced circuit diagrams as shown in fig. 1 to 4, and the splicing relation can be known according to the signal port labels on the circuit.

This scheme provides a power short-circuit protection circuit, includes: the TF CARD socket 10, the transistor 40 and the load switch 30, wherein the VSS pin and the GND pin of the TF CARD socket 10 are grounded, the VDD pin of the TF CARD socket 10 is connected to the VOUT pin of the load switch 30, respectively, the CARD _ DET pin of the TF CARD socket 10 is connected to the ON pin and the VIN pin of the load switch 30 through the transistor 40, respectively, and the VDD pin of the TF CARD socket 10 is grounded through the bleeder resistor 50.

Specifically, the TF card is inserted into a TF card socket 10 to be connected to a circuit, the TF card socket 10 is a chip with a plurality of pins, in an embodiment of the present disclosure, the chip type of the TF card socket 10 is selected as: HYC04-TF 09-200.

As shown in fig. 1 and 4, the connection circuit between the VDD pin of the TF card socket 10 and the VOUT pin of the load switch 30 is grounded through a multi-branch. Specifically, a branch of a connection circuit between the VDD pin of the TF card socket 10 and the VOUT pin of the load switch 30 is grounded through a multi-path capacitor, as shown in the position of C13/C9/C10/C12/C35, wherein the model of C10 is 100nF/25V, the model of C12 is 10uF/25V, the model of C13 is 10uF/10V, and the model of C9 is 100 nF/25V.

A bleeder resistor 50 is also placed in the branch of the connection circuit between the VDD pin of the TF card socket 10 and the VOUT pin of the load switch 30, wherein the model of the bleeder resistor 50 may be selected to be 1K, 50%.

The QOD pin of the load switch 30 is connected to a connection circuit of the VDD pin of the TF card socket 10 and the VOUT pin of the load switch 30 through a resistor R8, wherein the model of R8 may be selected to be 200R, 1%.

In addition, a magnetic bead is arranged on a connection circuit of the VDD pin of the TF card socket 10 and the VOUT pin of the load switch 30, wherein the type of the magnetic bead can be selected to be PB 1608-121/2A.

The GND pin and the CT pin of the load switch 30 are grounded, and a capacitor is disposed between the CT pin and the ground.

The CARD _ DET pin of the TF CARD socket 10 is connected to the transistor 40, and a resistor R38, a diode, and a resistor R24 are sequentially disposed on a connection circuit where the CARD _ DET pin of the TF CARD socket 10 and the transistor 40 are connected, and a connection circuit branch where the CARD _ DET pin of the TF CARD socket 10 and the transistor 40 are connected is grounded through a resistor R22.

The transistor 40 has a base connected to the CARD _ DET pin of the TF CARD socket 10, an emitter grounded, and a collector connected to the ON pin and the VIN pin of the load switch 30, respectively. Wherein a resistor R252 is provided between the collector of transistor 40 and the VIN pin of load switch 30. In addition, VIN pin of the load switch 30 is grounded through a capacitor C11, wherein the type of the capacitor C11 can be 10uF/10V

In the embodiment of the present embodiment, the load switch 30 is a chip provided with a plurality of pins, wherein the model of the load switch 30 is selected to be TPS22918 DBVR.

Specifically, the working principle of the power supply short-circuit protection circuit is as follows: when the TF card is pulled out from the TF card socket 10, the transistor 40 is turned on, and correspondingly, the level of one end of the load switch 30 is changed to a low level, and the load switch 30 is turned off; meanwhile, the circuit led out from the VDD terminal of the TF card socket 10 also has a capacitor residual voltage, and the capacitor residual voltage is discharged through the discharging resistor 50, so that the circuit is not electrified when the TF card is inserted into the TF card socket 10 next time, and the TF card is protected from loss.

In some embodiments, a pin of the TF card socket 10 is connected with a transient diode to further play a role of electrostatic prevention. As shown in fig. 1 to 3, the TF card socket 10 is connected to a first transient diode 21 and a second transient diode 22, specifically, a CMD pin, a DATA2 pin, a CLK pin, and a DATA3 pin of the TF card socket 10 are respectively connected to four interfaces of the first transient diode 21, and the first transient diode 21 is grounded; the DATA0 pin, the DATA1 pin, and the CARD _ DET pin of the TF CARD socket 10 are respectively connected to three interfaces of the second transient diode 22, and the second transient diode 22 is grounded.

And the connection circuit of the TF card socket 10, the first transient diode 21 and the second transient diode 22 is provided with a resistor.

The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by the teaching of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as the present invention, fall within the protection scope of the present invention.

Claims

1. A power supply short protection circuit, comprising:

the TF CARD socket comprises a TF CARD socket (10), a transistor (40) and a load switch (30), wherein a VSS pin and a GND pin of the TF CARD socket (10) are grounded, a VDD pin of the TF CARD socket (10) is respectively connected with a VOUT pin of the load switch (30), a CARD _ DET pin of the TF CARD socket (10) is respectively connected with an ON pin and a VIN pin of the load switch (30) through the transistor (40), and the VDD pin of the TF CARD socket (10) is grounded through a bleeder resistor (50).

2. The power supply short-circuit protection circuit according to claim 1, wherein the QOD pin of the load switch (30) is connected to a connection circuit of the VDD pin of the TF card socket (10) and the VOUT pin of the load switch (30) through a resistor.

3. The power supply short protection circuit according to claim 1, wherein the transistor (40) has a base connected to the CARD _ DET pin of the TF CARD socket (10), an emitter grounded, and a collector connected to the ON pin and the VIN pin of the load switch (30), respectively.

4. The power supply short-circuit protection circuit according to claim 1, wherein the GND pin and the CT pin of the load switch (30) are grounded, and the VIN pin of the load switch (30) is grounded through a capacitor.

5. The power supply short-circuit protection circuit according to claim 1, wherein a resistor and a diode are provided on a connection circuit connecting the CARD _ DET pin of the TF CARD socket (10) and the transistor (40).

6. A power supply short protection circuit according to claim 1, characterized in that the TF card socket (10) is connected to a first transient diode (21) and a second transient diode (22).

7. The power supply short-circuit protection circuit according to claim 6, wherein the CMD pin, the DATA2 pin, the CLK pin, and the DATA3 pin of the TF card socket (10) are respectively connected to four interfaces of the first transient diode (21), and the first transient diode (21) is grounded.

8. The power supply short-circuit protection circuit according to claim 6, wherein the DATA0 pin, the DATA1 pin, and the CARD _ DET pin of the TF CARD socket (10) are respectively connected to three interfaces of the second transient diode (22), and the second transient diode (22) is grounded.

9. The power supply short-circuit protection circuit according to claim 6, wherein a resistor is arranged on a connection circuit of the TF card socket (10) and the first transient diode (21) and the second transient diode (22).