CN106526403A - Terminal leak current detection circuit, terminal and terminal leak current detection system - Google Patents

Abstract

The embodiment of the present invention discloses a terminal leakage current detection circuit, including: an access terminal, used to access the external power supply and identification module, wherein the external power supply and identification module are used to supply the external power supply and identification module of the access terminal Used to output the leakage current value; the terminal battery is used to supply power to the terminal system; the first switch, the input end is electrically connected to the access end; the second switch, the input end is electrically connected to the terminal battery; the power output end, respectively electrically connected to the output end of the first switch and the output end of the second switch; the control unit controls the on and off of the first switch and the second switch respectively; wherein, when the control unit receives the leakage current detection instruction, The control unit controls the first switch to be turned on, and controls the second switch to be turned off, so that the external power supply and the identification module can obtain the leakage current value. The embodiment of the invention also discloses a terminal and a terminal leakage current detection system. Adopting the present invention has the advantage of being convenient for terminal leakage current detection.

Description

A terminal leakage current detection circuit, a terminal and a terminal leakage current detection system

technical field

The invention relates to the technical field of leakage current detection, in particular to a terminal leakage current detection circuit, a terminal and a terminal leakage current detection system.

Background technique

Existing terminals, such as mobile phones, tablets, etc., will have some potential leakage risks during the development and design process. Terminal leakage will lead to rapid power consumption of the terminal, and users need to charge frequently, which will affect the user experience, and terminal leakage will cause When the mobile phone is placed for a long time, the battery in the terminal may be over-discharged, and the user needs to reactivate the battery, which will cause inconvenience to the user, and the leakage of the terminal will cause some components to fail.

The leakage current detection of the terminal is a routine test before the terminal leaves the factory. The existing technology proposes a leakage detection through a fake battery. The specific solution is: take out the battery of the terminal, and replace the battery with a protection board and an external regulated power supply. The regulated power supply can supply power to the mobile phone. When it is not turned on, the current output by the regulated power supply is approximately the leakage current of the mobile phone, so that it can be detected whether the terminal meets the requirements. However, the detection of terminal leakage current through fake batteries can only be performed on a sample basis, and the leakage test cannot be performed on the entire batch of mobile phones. There may be a risk of missed detection, and the efficiency is relatively low.

Contents of the invention

The technical problem to be solved by the embodiments of the present invention is to provide a terminal leakage current detection circuit, a terminal and a system. Can facilitate terminal leakage current detection.

In order to solve the above technical problems, the first aspect of the embodiment of the present invention provides a terminal leakage current detection circuit, including:

The access terminal is used to access the external power supply and the identification module, wherein the external power supply and the identification module are used to supply the external power supply to the access terminal and output the leakage current value;

terminal battery, used to supply power to the terminal system;

a first switch, the input end of which is electrically connected to the access end;

a second switch, the input end of which is electrically connected to the terminal battery;

The output terminal of the power supply is electrically connected to the output terminal of the first switch and the output terminal of the second switch respectively;

The control unit controls the on and off of the first switch and the second switch respectively; wherein, when the control unit receives the leakage current detection instruction, the control unit controls the first switch to be on, and controls the second switch to be off, so that Make the external power supply and identification module obtain the leakage current value.

A second aspect of the embodiments of the present invention provides a terminal, including the above-mentioned terminal leakage current detection circuit.

The third aspect of the embodiment of the present invention provides a terminal leakage current detection system, including an external power supply and identification module and the above-mentioned terminal, the external power supply and identification module are used to supply the external power supply to the access terminal and to output the leakage current value .

Implementing the embodiment of the present invention has the following beneficial effects: since the access terminal is used to access the external power supply and the identification module, the first switch, the second switch, the power supply output terminal, the control unit and the terminal battery are all located in the terminal, thus , the staff only need to electrically connect the external power supply and the identification module to the access terminal. When the control unit receives the leakage current detection instruction, the staff can easily obtain the leakage current value of the terminal, which is easy to operate and convenient for batch terminals. There is no risk of leakage current detection, and the detection efficiency is also high. Moreover, this detection circuit can be used on non-detachable terminal batteries, which broadens the application range of the detection circuit.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a terminal leakage current detection circuit of the first embodiment of the present invention;

Fig. 2 is a circuit diagram of an external power supply and an identification module according to the first embodiment of the present invention;

Fig. 3 is a terminal leakage current detection circuit according to the second embodiment of the present invention;

4 is an electrical connection diagram of a power supply selection circuit according to a second embodiment of the present invention;

Icon label:

110-access terminal; 120-first switch; 121-first PMOS tube; 122-second PMOS tube; 130-second switch; 131-first NMOS tube; 132-second NMOS tube; 140-power output 150, 250-control unit; 160-terminal battery; 170-stabilized power supply; 180-computer; 270-power supply selection circuit.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

first embodiment

Please refer to FIG. 1 and FIG. 2, which are terminal leakage current detection circuits according to an embodiment of the present invention. In this embodiment, the terminal leakage current detection circuit is used for electrical connection with an external power supply and an identification module. The module includes a regulated power supply 170 and a computer 180, the output of the regulated power supply 170 is electrically connected to the input of the detection circuit to supply power to the detection circuit, the computer 180 is used to output the leakage current value, and the regulated power supply 170 Communicate with the computer 180 to send the output voltage and output current of the regulated power supply 170 to the computer 180. In other embodiments of the present invention, the regulated power supply and the computer can also be combined together. The terminal leakage current detection circuit includes an access terminal 110 , a terminal battery 160 , a first switch 120 , a second switch 130 , a power output terminal 140 and a control unit 150 .

Specifically, in this embodiment, the access terminal 110 is electrically connected to the external power supply and the identification module, specifically to the regulated power supply 170. In this embodiment, the access terminal 110 is the USB terminal of the terminal. Vbus pin, so that the regulated power supply 170 can be electrically connected to the terminal leakage current detection circuit through the data line. The terminal battery 160 is located on the terminal and is used to supply power to the terminal system. The terminal battery 160 is a detachable battery or a non-detachable battery.

The input end of the first switch 120 is electrically connected to the access end 110, and the output end of the first switch 120 is electrically connected to the power supply output end 140, so that the power of the stabilized power supply 170 passes through the access end 110, leads to The first switch 120 and the power output terminal 140 that are turned on are supplied to the terminal system, and this power supply circuit is referred to as a detection power supply circuit here. The input terminal of the second switch 130 is electrically connected to the terminal battery 160, and the output terminal of the second switch 130 is electrically connected to the power supply output terminal 140, so that the power of the terminal battery 160 passes through the conductive second The terminal system output by the switch 130 and the power supply output terminal 140 is referred to as a normal power supply circuit here.

The control unit 150 controls on and off of the first switch 120 and the second switch 130 respectively, so that the control unit 150 controls whether the detection power supply circuit or the normal power supply circuit supplies power to the terminal system. Specifically, the control unit 150 will receive the leakage current detection instruction, which can be an operation instruction input by the staff, for example, the instruction can be input through other pins of the USB, or the button on the terminal can be triggered to input the instruction. It can be voice control to input the instruction, etc. When the control unit 150 receives the leakage current detection instruction, the control unit 150 controls the first switch 120 to turn on, and controls the second switch 130 to turn off. At this time, the detection power supply circuit Normal work, the normal power supply circuit is disconnected, and the terminal is in the shutdown state at this time. At this time, the output current of the regulated power supply 170 is the terminal leakage current. Therefore, because the regulated power supply 170 will transmit the output current and output voltage to the computer 180 , thus, the computer 180 can obtain the leakage current information and output it, such as displaying it on the display screen, or process the output leakage current information, for example, a threshold value can be preset in the computer 180, and when it is greater than the threshold value, the computer 180 will mark red The leakage current information indicates that the detected corresponding terminals do not meet the requirements, so that the terminals that do not meet the requirements can be seen from the display screen of the computer.

In this embodiment, since the access terminal 110 is used to access the external power supply and the identification module, the first switch 120, the second switch 130, the power output terminal 140, the control unit 150 and the terminal battery 160 are all located in the terminal, Therefore, the staff only need to electrically connect the external power supply and the identification module to the access terminal 110. When the control unit 150 receives the leakage current detection instruction, the staff can easily obtain the leakage current value of the terminal, which is easy and convenient to operate. For the leakage current detection of batch terminals, there is no risk of missing detection, and the detection efficiency is also high. Moreover, this detection circuit can be used on the non-detachable terminal battery 160, which broadens the application range of the detection circuit.

In this embodiment, the first switch 120 may have the following forms:

1. The first switch 120 includes two reversely connected PMOS transistors (positive channel Metal Oxide Semiconductor). Specifically, the D pole (drain) of the first PMOS transistor 121 is electrically connected to the access terminal 110, and the first The S pole (source) of the PMOS transistor 121 is electrically connected to the second PMOS transistor 122, and the G pole (gate) of the first PMOS transistor 121 is electrically connected to the control unit 150; The S pole is electrically connected to the S pole of the first PMOS transistor 121, the D pole of the second PMOS transistor is electrically connected to the power output terminal 140, and the G pole of the second PMOS transistor 122 is electrically connected to the control unit 150. Connection, this way of reverse connection of two PMOS transistors can better control the on and off of the first switch 120, and when the detection power supply circuit is disconnected, the normal power supply circuit will not be in the first switch 120. Leakage current is generated at 120, so this kind of scheme has better industrial realization and lower cost. In addition, in other embodiments of the present invention, the S pole of the first PMOS transistor is electrically connected to the access terminal, the D pole of the first PMOS transistor is electrically connected to the second PMOS transistor, and the first PMOS transistor The G pole of the second PMOS transistor is electrically connected to the control unit; the D pole of the second PMOS transistor is electrically connected to the D pole of the first PMOS transistor, and the S pole of the second PMOS transistor is electrically connected to the output terminal of the power supply. The G pole of the second PMOS transistor is electrically connected to the control unit, and this method is also a reverse connection method of the two PMOS transistors.

2. The first switch 120 includes two reversely connected NMOS transistors (Negative channel Metal Oxide Semiconductor). For details on how to connect to the access terminal 110, the power supply output terminal 140, and the control unit 150, please refer to point 1, which will not be repeated here. repeat.

3. The first switch 120 includes a PMOS transistor or an NMOS transistor, which can also control and detect the conduction or disconnection of the power supply circuit. Taking the first switch 120 including a PMOS transistor as an example, the D pole of the PMOS transistor It is electrically connected to the access terminal 110 , the S pole of the PMOS transistor is electrically connected to the power output terminal 140 , and the G pole of the PMOS transistor is electrically connected to the control unit 150 .

4. The first switch 120 includes a transistor, such as an NPN transistor or a PNP transistor. The NPN transistor is used as an example for illustration below. The collector of the transistor is electrically connected to the access terminal 110, and the emitter of the transistor The pole is electrically connected to the power output terminal 140 , and the base of the triode is electrically connected to the control unit 150 .

Of course, the first switch 120 may also be other commonly used switches, which will not be repeated here.

In this embodiment, the second switch 130 may have the following forms:

1. The second switch 130 includes two reversely connected NMOS transistors. Specifically, the S pole (source) of the first NMOS transistor 131 is electrically connected to the terminal battery 160, and the D pole (source) of the first NMOS transistor 131 ( Drain) is electrically connected to the second NMOS transistor 132, and the G pole (gate) of the first NMOS transistor 131 is electrically connected to the control unit 150; the D pole of the second NMOS transistor 132 is electrically connected to the first The D pole of the NMOS transistor 131 is electrically connected, the S pole of the second NMOS transistor is electrically connected to the power output terminal 140, and the G pole of the second NMOS transistor 132 is electrically connected to the control unit 150. The way of reverse connection of the tube can better control the conduction and disconnection of the first switch 120, and when the normal power supply circuit is disconnected, no leakage current will be generated at the second switch 130 when the detection power supply circuit is working, so that This kind of solution has better industrial realization and lower cost. In addition, in other embodiments of the present invention, the D pole of the first NMOS transistor is electrically connected to the terminal battery, the S pole of the first NMOS transistor is electrically connected to the second NMOS transistor, and the The G pole is electrically connected to the control unit; the S pole of the second NMOS transistor is electrically connected to the S pole of the first NMOS transistor, and the D pole of the second NMOS transistor is electrically connected to the output terminal of the power supply. The G pole of the second NMOS transistor is electrically connected to the control unit, and this method is also a method in which the two NMOS transistors are connected in reverse.

2. The second switch 130 includes two reversely connected PMOS transistors. Please refer to point 1 for details on how to connect to the terminal battery 160 , the power output terminal 140 , and the control unit 150 , and details will not be repeated here.

3. The second switch 130 includes a PMOS transistor or an NMOS transistor, which can also control and detect the conduction or disconnection of the power supply circuit. Taking the second switch 130 including an NMOS transistor as an example, the S pole of the NMOS transistor The (source) is electrically connected to the terminal battery 160 , the D pole (drain) of the NMOS transistor is electrically connected to the power output terminal 140 , and the G pole (gate) of the NMOS transistor is electrically connected to the control unit 150 .

4. The first switch 120 includes a transistor, such as an NPN transistor or a PNP transistor. The NPN transistor is used as an example for illustration below. The collector of the transistor is electrically connected to the access terminal 110, and the emitter of the transistor The pole is electrically connected to the power output terminal 140 , and the base of the triode is electrically connected to the control unit 150 .

Of course, the second switch 130 may also be other commonly used switches, which will not be repeated here.

In this embodiment, the control unit 150 may be a microprocessor, or other control chips, which will not be repeated here. In this embodiment, the control unit 150 is powered by a button battery, but the present invention is not limited thereto. In other embodiments of the present invention, the control unit is always electrically connected to the terminal battery, so that the terminal battery can Always supply power to the control unit.

In this embodiment, the terminal is an electronic device such as a mobile phone or a tablet computer that requires leakage current detection.

second embodiment

Fig. 3 is the terminal leakage current detection circuit of the second embodiment of the present invention. The circuit in Fig. 3 is similar to the circuit in Fig. 1, so the same component symbols represent the same components. The main difference between this embodiment and the first embodiment is the control power supply of the unit.

Referring to FIG. 3 and FIG. 4, in this embodiment, the access terminal 110 is also electrically connected to the first input terminal of the power supply selection circuit 270, and the second input terminal of the power supply selection circuit 270 is electrically connected to the terminal battery 160, The output end of the power supply selection circuit 270 is electrically connected to the control unit 250 to supply power to the control unit 250 .

Specifically, when the terminal is in a normal working state, the power supply selection circuit 270 selects the second input terminal to be connected to the output terminal, and the first input terminal to be disconnected from the output terminal. The second input terminal and output terminal of the selection circuit 270 are supplied to the control unit 250 . When the terminal is in the leakage current detection state, the power supply selection circuit 270 selects the first input terminal to be connected to the output terminal, and the second input terminal to be disconnected from the output terminal. At this time, the power of the external power supply and the identification module passes through the first The input terminal and the output terminal are supplied to the control unit 250 .

In this embodiment, the power supply selection circuit 270 is a single-pole double-throw switch, the moving end of the single-pole double-throw switch is electrically connected to the control unit 250, and the two fixed ends of the single-pole double-throw switch are respectively connected to the access end 110 is electrically connected to the terminal battery 160 , that is, the first input end and the second input end of the SPDT switch are electrically connected to the access terminal 110 and the terminal battery 160 respectively.

In this embodiment, whether the SPDT switch is turned on to the access terminal 110 or to the terminal battery 160 is controlled by the control unit 250. Specifically, the SPDT switch operates under normal conditions. terminal is electrically connected to the fixed terminal electrically connected to the terminal battery 160, that is, the power of the control unit 250 is supplied by the terminal battery 160 under normal conditions; In the state of leakage current, the control unit 250 controls the moving end of the SPDT switch to conduct with the fixed end electrically connected to the access end 110, so that the power of the control unit 250 is supplied by the external power supply and the identification module. Thus, the SPDT switch is controlled by the control unit 250 . In addition, in other embodiments of the present invention, the power supply selection circuit may also be composed of other similar circuits or electronic components with a single-pole-double-throw switch function, such as relays.

In this embodiment, due to the power supply selection circuit 270, the power of the processor can be supplied by an external power supply and an identification module, so that when producing a terminal, the terminal that needs leakage current detection does not need to install the terminal battery 160, and the terminal battery 160 is installed after the detection is completed. battery 160, thereby saving the process and facilitating large-scale terminal detection; and, even if the terminal battery 160 has been installed on the terminal, the terminal battery 160 does not need to be removed during leakage current detection, thereby saving the process and reducing the cost. It is convenient for batch detection. Moreover, this detection circuit can be used on the non-detachable terminal battery 160, which broadens the application range of the detection circuit.

In addition, in this embodiment, the current value obtained by the computer 180 from the regulated power supply 170 is approximately the leakage current value of the terminal, but in order to obtain a more accurate leakage current value, it can also be calculated by the computer 180, that is, from The current value obtained at the regulated power supply 170 minus the current value consumed by the control unit 250 is the leakage current value, which can be output; is very low, so in this embodiment, the current value obtained by the computer 180 from the regulated power supply 170 is approximately the leakage current value of the terminal.

In addition, the present invention also provides a terminal, which includes the above-mentioned terminal leakage current detection circuit.

In addition, the present invention also provides a terminal leakage current detection system, the terminal leakage current detection system includes an external power supply and an identification module and the above-mentioned terminal, the external power supply and identification module are used to supply the external power supply of the access terminal and the user at the output leakage current value. Wherein, in this embodiment, the external power supply and the identification module include a regulated power supply and a computer, the regulated power supply is electrically connected to the terminal access terminal, specifically the connection between the regulated power supply and the terminal leakage current detection circuit The input terminal is electrically connected, and the stabilized power supply is connected to the computer to obtain the output current value of the stabilized power supply.

It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. For the same and similar parts in each embodiment, refer to each other, that is, Can. As for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and for related parts, please refer to the part of the description of the method embodiment.

Through the description of the foregoing embodiments, the present invention has the following advantages:

Since the access terminal is used to access the external power supply and the identification module, the first switch, the second switch, the power output terminal, the control unit and the terminal battery are all located in the terminal, so that the staff only need to connect the external power supply and the identification module Electrically connected to the access terminal, when the control unit receives the leakage current detection instruction, the staff can easily obtain the leakage current value of the terminal, which is easy to operate and convenient for batch terminal leakage current detection, and there will be no missing test risk, and the detection efficiency is also high. Moreover, this detection circuit can be used on non-detachable terminal batteries, which broadens the application range of the detection circuit.

The above disclosures are only preferred embodiments of the present invention, and certainly cannot limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope of the present invention.

Claims (10)

1. A terminal leakage current detection circuit, for being electrically connected with an external power supply and an identification module, is characterized in that, comprising: The access terminal is used to access the external power supply and the identification module, wherein the external power supply and the identification module are used to supply the external power supply to the access terminal and output the leakage current value; terminal battery, used to supply power to the terminal system; a first switch, the input end of which is electrically connected to the access end; a second switch, the input end of which is electrically connected to the terminal battery; The output terminal of the power supply is electrically connected to the output terminal of the first switch and the output terminal of the second switch respectively; The control unit controls the on and off of the first switch and the second switch respectively; wherein, when the control unit receives the leakage current detection instruction, the control unit controls the first switch to be on, and controls the second switch to be off, so that Make the external power supply and identification module obtain the leakage current value. 2. The terminal leakage current detection circuit according to claim 1, wherein the detection circuit also includes a power supply selection circuit, and the power supply selection circuit is electrically connected to the access terminal, the terminal battery, and the control unit respectively, so as to Power supply control unit. 3. The terminal leakage current detection circuit according to claim 2, wherein the control unit controls the power supply selection circuit to electrically connect the access terminal to the control unit or to electrically connect the terminal battery to the control unit, When the control unit receives a leakage current detection instruction, the access terminal is electrically connected to the control unit. 4. The terminal leakage current detection circuit according to claim 2, wherein the power supply selection circuit comprises a single-pole double-throw switch, the moving end of the single-pole double-throw switch is electrically connected to the control unit, and the single-pole double-throw switch The two fixed ends are electrically connected with the access end and the terminal battery respectively. 5. The terminal leakage current detection circuit according to claim 1, wherein the first switch comprises two reversely connected PMOS transistors, and the gates of the two PMOS transistors are electrically connected to the control unit; or the The first switch includes two reversely connected NMOS transistors, and the gates of the two NMOS transistors are electrically connected to the control unit. 6. The terminal leakage current detection circuit according to claim 1, wherein the second switch comprises two reversely connected NMOS transistors, and the gates of the two NMOS transistors are electrically connected to the control unit; or, The second switch includes two reversely connected PMOS transistors, and the gates of the two PMOS transistors are electrically connected to the control unit. 7. The terminal leakage current detection circuit according to claim 1, wherein the access terminal is a Vbus pin of the terminal USB. 8. A terminal, characterized by comprising the terminal leakage current detection circuit according to any one of claims 1-7. 9. A terminal leakage current detection system, characterized in that it includes an external power supply and an identification module and the terminal as claimed in claim 8, the external power supply and identification module are used to supply the external power supply to the access terminal and to output the leakage current. current value. 10. The terminal leakage current detection system according to claim 9, wherein the external power supply and the identification module include a regulated power supply and a computer, the regulated power supply is electrically connected to the terminal access terminal, and the regulated power supply The piezoelectric power supply is connected to the computer to obtain the current value output by the regulated power supply.