CN112904229A - Short circuit detection device and short circuit detection method - Google Patents
Short circuit detection device and short circuit detection method Download PDFInfo
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- CN112904229A CN112904229A CN202110097510.5A CN202110097510A CN112904229A CN 112904229 A CN112904229 A CN 112904229A CN 202110097510 A CN202110097510 A CN 202110097510A CN 112904229 A CN112904229 A CN 112904229A
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Abstract
The invention discloses a short circuit detection device and a short circuit detection method. The short circuit detection device is used for detecting whether the device to be detected is short-circuited, the device to be detected comprises at least two first current inflow ends and one first current outflow end, and the short circuit detection device comprises: a main detection unit including at least two second current outflow terminals and one second current inflow terminal; the at least two second current outflow ends are used for being electrically connected with the at least two first current inflow ends in a one-to-one correspondence manner; the first end of the current detection unit is electrically connected with the second current inflow end, the second end of the current detection unit is electrically connected with the first current outflow end, and the current detection unit is used for detecting the current flowing through the first current outflow end. The embodiment of the invention can reduce the cost of the short circuit detection device.
Description
Technical Field
The embodiment of the invention relates to the technical field of electronic detection, in particular to a short circuit detection device and a short circuit detection method.
Background
With the development of electronic technology, the safety of electronic systems is more and more important, for example, the short circuit detection of electronic systems has important reference value for evaluating the performance of electronic systems.
However, the conventional short circuit detection device has a complicated process and high cost when short circuit detection is performed, and further application of short circuit detection is limited.
Disclosure of Invention
The invention provides a short circuit detection device and a short circuit detection method, which can simply and efficiently detect the short circuit condition of a device to be detected.
In a first aspect, an embodiment of the present invention provides a short-circuit detection device, configured to detect whether a device to be detected is short-circuited, where the device to be detected includes at least two first current inflow terminals and one first current outflow terminal, and the short-circuit detection device includes: a main detection unit including at least two second current outflow terminals and one second current inflow terminal; the at least two second current outflow ends are used for being electrically connected with the at least two first current inflow ends in a one-to-one correspondence manner; the first end of the current detection unit is electrically connected with the second current inflow end, the second end of the current detection unit is electrically connected with the first current outflow end, and the current detection unit is used for detecting the current flowing through the first current outflow end.
Optionally, the current detection unit includes: the current meter comprises a first resistor, a second resistor, a third resistor, a fourth resistor and a galvanometer; the first end of the first resistor is electrically connected with the first end of the second resistor, the first end of the first resistor and the first end of the second resistor are connected with a reference signal, the reference signal is used for providing a reference potential, and the second end of the first resistor is electrically connected with the first end of the third resistor; the second end of the second resistor is electrically connected with the first end of the fourth resistor; a second end of the third resistor is used as a second end of the current detection unit, and a second end of the fourth resistor is used as a first end of the current detection unit; a first end of the galvanometer is connected between the third resistor and the first resistor, and a second end of the galvanometer is connected between the fourth resistor and the second resistor; the galvanometer is configured to determine whether the device to be detected is short-circuited according to the current indication change condition flowing through the galvanometer.
Optionally, the resistance value of the first resistor is equal to the resistance value of the second resistor; the third and fourth resistances are configured to: the sum of the resistance value of the third resistor and the internal resistance of the device to be detected in the initial state is equal to the sum of the resistance value of the fourth resistor and the internal resistance of the main detection unit.
Optionally, the current detection unit is a multimeter.
Optionally, the device to be detected comprises a display panel and a flexible circuit board, and the main detection unit comprises a main board.
In a second aspect, an embodiment of the present invention further provides a short circuit detection method, which is executed by the short circuit detection apparatus in the first aspect, and is characterized in that the short circuit detection method includes:
electrically connecting at least two second current outflow ends of the short circuit detection device with at least two second current inflow ends of the device to be detected in a one-to-one correspondence manner, and electrically connecting a second end of the current detection unit with a first current outflow end of the device to be detected;
and determining whether the device to be detected is short-circuited according to the current flowing through the first current outflow end detected by the current detection unit.
Optionally, the method comprises:
and determining whether the device to be detected is short-circuited according to whether the current flowing through the first current outflow end detected by the current detection unit changes within a preset time.
Optionally, the method comprises:
and performing preset operation on the device to be detected, and determining whether the device to be detected is short-circuited according to the current flowing through the first current outflow end and detected by the current detection unit.
Optionally, if the current flowing through the first current outflow end detected by the current detection unit before the preset operation is performed on the device to be detected is different from the current flowing through the first current outflow end detected by the current detection unit after the preset operation is performed on the device to be detected, it is determined that the device to be detected is short-circuited; and if the current flowing through the first current outflow end detected by the current detection unit before the preset operation is performed on the device to be detected is the same as the current flowing through the first current outflow end detected by the current detection unit after the preset operation is performed on the device to be detected, determining that the short circuit does not occur in the device to be detected.
Optionally, the current detection unit includes: the current meter comprises a first resistor, a second resistor, a third resistor, a fourth resistor and a galvanometer; the first end of the first resistor is electrically connected with the first end of the second resistor, the first end of the first resistor and the first end of the second resistor are connected with a reference signal, the reference signal is used for providing a reference potential, and the second end of the first resistor is electrically connected with the first end of the third resistor; the second end of the second resistor is electrically connected with the first end of the fourth resistor; a second end of the third resistor is used as a second end of the current detection unit, and a second end of the fourth resistor is used as a first end of the current detection unit; a first end of the galvanometer is connected between the third resistor and the first resistor, and a second end of the galvanometer is connected between the fourth resistor and the second resistor;
the determining whether the device to be detected is short-circuited according to the current flowing through the first current outflow end detected by the current detection unit includes:
if the galvanometer readings are different from the initial readings when the device to be detected is connected into the short circuit detection device, determining that the device to be detected is short-circuited; and if the current indicator of the galvanometer is the same as the initial indicator when the device to be detected is connected into the short circuit detection device, determining that the short circuit does not occur in the device to be detected.
According to the technical scheme of the embodiment of the invention, the adopted short circuit detection device comprises a main detection unit, wherein the main detection unit comprises at least two second current outflow ends and a second current inflow end; the at least two second current outflow ends are used for being electrically connected with the at least two first current inflow ends of the device to be detected in a one-to-one correspondence manner; and the first end of the current detection unit is electrically connected with the second current inflow end, the second end of the current detection unit is electrically connected with the first current outflow end of the device to be detected, and the current detection unit is used for detecting the current flowing through the first current outflow end. The current detection unit is connected in series between the first current outflow end of the device to be detected and the second current inflow end of the current detection unit, so that whether the short circuit phenomenon occurs in the device to be detected can be judged, and therefore, the current detection units are not required to be connected in series between the at least two first current inflow ends of the device to be detected and the at least two second current outflow ends of the main detection unit respectively, the number of the current detection units is saved, and the detection cost is saved.
Drawings
Fig. 1 is a schematic circuit structure diagram of a short circuit detection device according to an embodiment of the present invention;
fig. 2 is a schematic circuit structure diagram of a short circuit detection device according to an embodiment of the present invention when electrically connected to a device to be detected;
fig. 3 is a schematic circuit structure diagram of another short circuit detection device provided in the embodiment of the present invention when electrically connected to a device to be detected;
fig. 4 is a schematic circuit structure diagram of another short circuit detection device provided in the embodiment of the present invention when electrically connected to a device to be detected;
fig. 5 is a flowchart of a short circuit detection method according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic circuit structure diagram of a short circuit detection device according to an embodiment of the present invention, fig. 2 is a schematic circuit structure diagram of a short circuit detection device according to an embodiment of the present invention when the short circuit detection device is electrically connected to a device to be detected, referring to fig. 1 and fig. 2, the device to be detected includes at least two first current inflow terminals a and one first current outflow terminal C, and the short circuit detection device includes: the main detection unit 101, the main detection unit 101 includes at least two second current outflow ends B and one second current inflow end D; the at least two second current outflow ends B are used for being electrically connected with the at least two first current inflow ends A in a one-to-one correspondence manner; a first end of the current detection unit 102 is electrically connected to the second current inflow end D, a second end of the current detection unit 102 is electrically connected to the first current outflow end C, and the current detection unit 102 is configured to detect a current flowing through the first current outflow end C.
Specifically, the device 201 to be tested includes a plurality of power utilization modules, which may be understood as a parallel structure, each power utilization module may correspond to one first current inflow terminal a, the device 201 to be tested is exemplarily shown in figures 1 and 2 to comprise five first current inflow terminals a, namely, a first current inflow end a1, a second first current inflow end a2, a third first current inflow end A3, a fourth first current inflow end a4 and a fifth first current inflow end a5, the currents inputted from at least two first current input ends a of the device 201 to be detected are outputted through the first current outflow end C, therefore, a current loop is formed, so that the device to be detected works normally, and the current flowing into each current inflow end in the device to be detected 201 flows through the corresponding power utilization module and then directly flows out from the first current outflow end C without flowing through other current inflow ends. The at least two second current output terminals B of the main detecting unit 101 are used for providing input currents to the at least two first current inflow terminals a of the device to be detected 201, and this embodiment exemplarily shows that the main detecting unit 101 includes five second current outflow terminals B, i.e., a first second current outflow terminal B1, a second current outflow terminal B2, a third second current outflow terminal B3, a fourth second current outflow terminal B4 and a fifth second current outflow terminal B5, and the second current inflow terminal D of the main detecting unit 101 is used for inputting the current flowing out from the first current outflow terminal C of the device to be detected 201, so that the main detecting unit 101 and the device to be detected 201 form a complete current loop, wherein the currents of all power modules of the device to be detected 201 and the main detecting unit 101 form a current loop through the first current outflow terminal C.
In this embodiment, the current detection unit 102 may be connected in series only between the second current inflow end D of the main detection unit 101 and the current outflow end C of the device to be detected 201, and the current detection unit 102 detects a current between the second current inflow end D of the main detection unit 101 and the second current outflow end C of the device to be detected 201, for example, a current value detected by the current detection unit 102 when the short-circuit detection device is just connected to the device to be detected is a first current value, and if a current value detected by the current detection unit 102 changes during the detection process, for example, the current value detected by the current detection unit 102 changes from the first current value to a second current value during the detection process, and the second current value is greater than the first current value, which indicates that a large current exists in the device to be detected 201, that a short-circuit phenomenon exists in the device to be detected 201.
In this embodiment, whether the device 201 to be detected is short-circuited under the preset operation can be determined by performing the preset operation on the device to be detected; for example, after the device 201 to be detected is electrically connected to the short-circuit detection device, a first current value detected by the current detection unit 102 is obtained, it should be noted that the device 201 to be detected has no short-circuit phenomenon in its initial state, because the device 201 to be detected has been subjected to various short-circuit detections in the preparation process, at this time, the first current value is a current value corresponding to the device 201 to be detected having no short-circuit phenomenon, then the device 201 to be detected is subjected to a preset operation, such as a dropping operation, a water inlet operation, a vibration operation, a corrosion operation or placing the device 201 to be detected in a static environment, and at this time, a second current value detected by the current detection unit 102 is obtained, and if the second current value is equal to the first current value, it indicates that the device to be detected will not cause a short-circuit when the device to be detected, if the second current value is larger than the first current value, it indicates that the device to be detected is short-circuited by performing a preset operation on the device to be detected. The initial state of the device to be detected can be understood as a state when the device to be detected is prepared, at this time, the device to be detected has no short circuit phenomenon inside, but the device to be detected needs to be detected whether the short circuit occurs in the using process (such as using preset time or performing preset operation on the device to be detected).
In addition, in the embodiment, since the current detection unit is only required to be connected in series between the first current outflow end of the device to be detected and the second current inflow end of the current detection unit, whether the device to be detected is short-circuited can be determined, so that it is not necessary to connect one current detection unit in series between at least two first current inflow ends of the device to be detected and at least two second current outflow ends of the main detection unit, which also saves the number of current detection units and saves the detection cost.
In the technical scheme of this embodiment, the adopted short circuit detection device comprises a main detection unit, wherein the main detection unit comprises at least two second current outflow ends and a second current inflow end; the at least two second current outflow ends are used for being electrically connected with the at least two first current inflow ends of the device to be detected in a one-to-one correspondence manner; and the first end of the current detection unit is electrically connected with the second current inflow end, the second end of the current detection unit is electrically connected with the first current outflow end of the device to be detected, and the current detection unit is used for detecting the current flowing through the first current outflow end. The current detection unit is connected in series between the first current outflow end of the device to be detected and the second current inflow end of the current detection unit, so that whether the short circuit phenomenon occurs in the device to be detected can be judged, and therefore, the current detection units are not required to be connected in series between the at least two first current inflow ends of the device to be detected and the at least two second current outflow ends of the main detection unit respectively, the number of the current detection units is saved, and the detection cost is saved.
Fig. 3 is a schematic circuit structure diagram of another short circuit detection device according to an embodiment of the present invention when the short circuit detection device is electrically connected to a device to be detected, and referring to fig. 3, the device to be detected includes a display panel 2011, and the main detection unit includes a main board 1011.
Specifically, the display panel 2011 may be, for example, an OLED (Organic Light Emitting Diode) display panel, the main board 1011 may provide various detection signals for the display panel, such as VCC, IOVCC, AVDD, ELVDD, ELVSS, and the like, and the functions of VCC, IOVCC, AVDD, ELVDD, and ELVSS are well known to those skilled in the art and are not described herein again, wherein five current outflow terminals on the main board 1011 provide the detection signals to five current inflow terminals of the display panel 2011 correspondingly; the conventional short circuit detection needs to be respectively connected with a current detection unit in series between five current outflow ends of the main board 1011 and five current inflow ends of the display panel 2011, the number of the required current detection units is large, the cost is high, in the embodiment, only one current detection unit needs to be connected in series between the current inflow end of the main board 1011 and the current outflow end of the display panel 2011, the short circuit detection can be completed only by one current detection unit, and the cost is greatly saved. Illustratively, the grounding terminal of the device to be detected 201 is reused as the first current outflow terminal, and the grounding terminal of the short-circuit detection device 101 is reused as the second current inflow terminal, so that the first current outflow terminal and the second current inflow terminal do not need to be additionally arranged, that is, the structure of the device to be detected does not need to be changed, the compatibility of the short-circuit detection device is improved, and meanwhile, the structure of the short-circuit detection device is simpler, which is beneficial to reducing the cost of the short-circuit detection device.
Alternatively, the five current inflow terminals of the display panel 2011 may be test circuit interfaces, such as test pins, on the display panel. The number of the test circuit interfaces is not limited and is set according to the requirement of the display panel.
Optionally, the device to be detected further comprises a flexible circuit board, a test circuit interface is arranged on the flexible circuit board, the test interface can be electrically connected with the current outflow end on the main board 1011, and is used for testing whether the interface of the flexible circuit board is short-circuited or not, and whether the flexible circuit board is short-circuited or not can be determined through one-time testing, if short-circuited, the flexible circuit board can be directly replaced, one-to-one detection is not needed, and the testing is simple and efficient.
Optionally, fig. 4 is a schematic circuit structure diagram of another short circuit detection device provided in the embodiment of the present invention when electrically connected to a device to be detected, and referring to fig. 4, the current detection unit includes: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a galvanometer G; a first end of the first resistor R1 is electrically connected with a first end of the second resistor R2, a first end of the first resistor R1 and a first end of the second resistor R2 are connected to a reference signal Vref, the reference signal Vref is used for providing a reference potential, and a second end of the first resistor R1 is electrically connected with a first end of the third resistor R3; a second end of the second resistor R2 is electrically connected with a first end of the fourth resistor R4; a second terminal of the third resistor R3 is used as a second terminal of the current detection unit, and a second terminal of the fourth resistor R4 is used as a first terminal of the current detection unit; a first end of the galvanometer G is connected between the third resistor R3 and the first resistor R1, that is, the first end of the galvanometer G is electrically connected with the first end of the third resistor R3 and the second end of the first resistor R1, and a second end of the galvanometer G is connected between the fourth resistor R4 and the second resistor R2, that is, the second end of the galvanometer G is electrically connected with the first end of the fourth resistor R4 and the second end of the second resistor R2; the galvanometer is configured to determine whether the device to be detected is short-circuited according to the current indication change condition flowing through the galvanometer. The short detection device is configured to: in the process of detecting whether the device to be detected is short-circuited, if the indication number of the galvanometer G is different from the initial indication number when the device to be detected is connected into the short-circuit detection device, determining that the device to be detected is short-circuited; and if the reading of the galvanometer is the same as the initial reading when the device to be detected is connected into the short circuit detection device, determining that the short circuit does not occur in the device to be detected.
Specifically, in this embodiment, the resistances of the first resistor R1 and the second resistor R2 may be set to be the same, and the reference signal Vref may be provided by the main detection unit 101, for example, the reference signal Vref may be 1.8V or 2.8V, and the embodiment of the present invention is not limited to this specifically; setting the internal resistance of the device to be detected in the initial state as R11, that is, the resistance of the resistor corresponding to the first current outflow end of the device to be detected 201 in the initial state as R11, the internal resistance of the main detection unit 101, that is, the resistance of the resistor corresponding to the second current inflow end of the main detection unit as R12, the resistance of the third resistor R3 as R13, and the resistance of the fourth resistor R4 as R14, in this embodiment, the sum of the resistance of the third resistor and the internal resistance of the device to be detected in the initial state is equal to the sum of the internal resistances of the main detection unit, that is, R11+ R13 is equal to R12+ R14; the galvanometer G may be a balance bridge galvanometer, when the device to be detected is just connected to the short circuit detection device, because R11+ R13 is R12+ R14, and the resistances of the first resistor R1 and the second resistor R2 are also equal, the potentials at the two ends of the galvanometer are the same, the current flowing through the galvanometer is zero, that is, the reading (also referred to as an initial reading) of the galvanometer G is zero at this time; in the detection process (for example, the device to be detected is used for a preset time or is subjected to preset operation), if the reading of the galvanometer G is detected to be not zero, the value of R11 is changed, and then the short circuit phenomenon inside the device to be detected 201 can be indicated. In this embodiment, the first resistor, the second resistor, the third resistor, the fourth resistor, the internal resistance of the device to be detected, and the internal resistance of the main detection unit can be used as a bridge, so that the change of the resistance of the bridge arm can be conveniently detected by the galvanometer, the detection precision is higher, and the sensitivity is higher.
In other embodiments, the first resistor and the second resistor may have different resistances; similarly, the sum of the resistance value of the third resistor and the internal resistance of the device to be detected in the initial state is set to be different from the sum of the resistance value of the fourth resistor and the internal resistance of the main detection unit; at this time, when the device to be detected is just connected to the short-circuit detection device, the initial reading of the galvanometer G is set as a first reading (the first reading may be zero or may not be zero, which is not specifically limited in the embodiment of the present invention); in the detection process, if the indication number of the galvanometer G is changed into a second indication number which is different from the first indication number, the change of R11 is indicated, namely the short circuit phenomenon of the device to be detected occurs; if the indication number of the galvanometer G is always kept as the first indication number in the detection process, the short circuit phenomenon of the device to be detected does not occur, and the performance of the device to be detected is better.
Optionally, the main detecting unit 101 is further configured to obtain a current value detected by a galvanometer, and determine whether the device to be detected is short-circuited according to the current value detected by the galvanometer.
Specifically, in this embodiment, the current value detected by the galvanometer may be directly obtained by the main detecting unit 101, and if the current value detected by the galvanometer becomes large, it indicates that a short circuit phenomenon exists inside the device to be detected. The indication number of the galvanometer is monitored through the main detection unit 101, so that the automatic detection of the short circuit of the device to be detected can be realized, and the manual judgment on whether the device to be detected is short circuit or not is not needed, thereby improving the detection efficiency.
For example, in some other embodiments, the current detection unit may also be a multimeter. The universal meter has the characteristics of higher universality, lower cost and the like, and the universal meter is favorable for reducing the cost of the short circuit detection device. When the device to be detected is a display panel and the main detection unit is a main board, the display panel can comprise a plurality of display modes, such as a sleep in mode and a deep sleep mode, and the like.
Fig. 5 is a flowchart of a short circuit detection method according to an embodiment of the present invention, and referring to fig. 5, the short circuit detection method is executed by a short circuit detection apparatus according to any embodiment of the present invention, and the short circuit detection method includes:
step S301, electrically connecting at least two second current outflow ends of the short-circuit detection device with at least two second current inflow ends of the device to be detected in a one-to-one correspondence manner, and electrically connecting a second end of the current detection unit with a first current outflow end of the device to be detected;
step S302, determining whether the device to be detected is short-circuited according to the current flowing through the first current outflow end detected by the current detection unit.
Specifically, the specific implementation process of the short circuit detection method provided in this embodiment may refer to the description of the short circuit detection device in this embodiment of the present invention, and is not described herein again. The short circuit detection method of the embodiment can complete short circuit detection only by one current detection unit, and greatly reduces the number of the required short circuit detection units, thereby saving detection time and reducing detection cost.
Optionally, the short circuit detection method includes:
and determining whether the device to be detected is short-circuited according to whether the current flowing through the first current outflow end detected by the current detection unit changes within a preset time.
Specifically, the embodiment can detect whether the device to be detected is short-circuited within a preset time displayed, for example, whether the device to be detected is short-circuited during long-time use, the preset time can be freely set, for example, 5 hours or 10 hours, and the like.
Optionally, the short circuit detection method includes:
and performing preset operation on the device to be detected, and determining whether the device to be detected is short-circuited according to the current flowing through the first current outflow end and detected by the current detection unit. If the current flowing through the first current outflow end detected by the current detection unit before the preset operation is performed on the device to be detected is different from the current flowing through the first current outflow end detected by the current detection unit after the preset operation is performed on the device to be detected, determining that the device to be detected is short-circuited; and if the current flowing through the first current outflow end detected by the current detection unit before the preset operation is performed on the device to be detected is the same as the current flowing through the first current outflow end detected by the current detection unit after the preset operation is performed on the device to be detected, determining that the short circuit does not occur in the device to be detected.
Specifically, the device to be detected has no short circuit phenomenon inside in an initial state, because the device to be detected has performed various short circuit detections in the preparation process, at this time, the first current value is also a current value corresponding to the device to be detected having no short circuit phenomenon inside, and then the device to be detected is subjected to a preset operation, such as a falling operation, a water inlet operation, a vibration operation, a corrosion operation or a placement of the device to be detected in an electrostatic environment, and the like, at this time, the second current value detected by the current detection unit is obtained, if the second current value is equal to the first current value, it is indicated that the device to be detected is not short-circuited when the preset operation is performed on the device to be detected, and if the second current value is greater than the first current value, it is indicated that the device to be detected is short-circuited.
Alternatively, as shown in fig. 4, the current detection unit includes: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a galvanometer G; a first end of the first resistor R1 is electrically connected with a first end of the second resistor R2, a first end of the first resistor R1 is connected with the reference signal Vref, and a second end of the first resistor R1 is electrically connected with a first end of the third resistor R3; a second end of the second resistor R2 is electrically connected with a first end of the fourth resistor R4; a second terminal of the third resistor R3 is used as a second terminal of the current detection unit, and a second terminal of the fourth resistor R4 is used as a first terminal of the current detection unit; a first end of the galvanometer G is connected between the third resistor R3 and the first resistor R1, and a second end of the galvanometer G is connected between the fourth resistor R4 and the second resistor R2;
determining whether the device to be detected is short-circuited according to the current flowing through the first current outflow end detected by the current detection unit includes:
if the galvanometer readings are different from the initial readings when the device to be detected is connected into the short circuit detection device, determining that the device to be detected is short-circuited; and if the current indicator of the galvanometer is the same as the initial indicator when the device to be detected is connected into the short circuit detection device, determining that the short circuit does not occur in the device to be detected.
Specifically, in this embodiment, the resistances of the first resistor R1 and the second resistor R2 may be set to be the same, and the reference signal Vref may be provided by the main detection unit 101, for example, the reference signal Vref may be 1.8V or 2.8V, and the embodiment of the present invention is not limited to this specifically; setting the internal resistance of the device to be detected in the initial state as R11, that is, the resistance of the resistor corresponding to the first current outflow end of the device to be detected 201 in the initial state as R11, the internal resistance of the main detection unit 101, that is, the resistance of the resistor corresponding to the second current inflow end of the main detection unit as R12, the resistance of the third resistor R3 as R13, and the resistance of the fourth resistor R4 as R14, in this embodiment, the sum of the resistance of the third resistor and the internal resistance of the device to be detected in the initial state is equal to the sum of the internal resistances of the main detection unit, that is, R11+ R13 is equal to R12+ R14; the galvanometer G may be a balance bridge galvanometer, when the device to be detected is just connected to the short circuit detection device, because R11+ R13 is R12+ R14, and the resistances of the first resistor R1 and the second resistor R2 are also equal, the potentials at the two ends of the galvanometer are the same, the current flowing through the galvanometer is zero, that is, the reading (also referred to as an initial reading) of the galvanometer G is zero at this time; in the detection process (for example, the device to be detected is used for a preset time or is subjected to preset operation), if the reading of the galvanometer G is detected to be not zero, the value of R11 is changed, and then the short circuit phenomenon inside the device to be detected 201 can be indicated. In this embodiment, the first resistor, the second resistor, the third resistor, the fourth resistor, the internal resistance of the device to be detected, and the internal resistance of the main detection unit can be used as a bridge, so that the change of the resistance of the bridge arm can be conveniently detected by the galvanometer, the detection precision is higher, and the sensitivity is higher.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A short circuit detection device for detecting whether a device to be detected is short-circuited, the device to be detected including at least two first current inflow terminals and one first current outflow terminal, the short circuit detection device comprising:
a main detection unit including at least two second current outflow terminals and one second current inflow terminal; the at least two second current outflow ends are used for being electrically connected with the at least two first current inflow ends in a one-to-one correspondence manner;
the first end of the current detection unit is electrically connected with the second current inflow end, the second end of the current detection unit is electrically connected with the first current outflow end, and the current detection unit is used for detecting the current flowing through the first current outflow end.
2. The short circuit detection device according to claim 1, wherein the current detection unit includes:
the current meter comprises a first resistor, a second resistor, a third resistor, a fourth resistor and a galvanometer;
the first end of the first resistor is electrically connected with the first end of the second resistor, the first end of the first resistor and the first end of the second resistor are connected with a reference signal, the reference signal is used for providing a reference potential, and the second end of the first resistor is electrically connected with the first end of the third resistor;
the second end of the second resistor is electrically connected with the first end of the fourth resistor;
a second end of the third resistor is used as a second end of the current detection unit, and a second end of the fourth resistor is used as a first end of the current detection unit;
the first end of the galvanometer is connected between the third resistor and the first resistor, the second end of the galvanometer is connected between the fourth resistor and the second resistor, and the galvanometer is configured to determine whether the device to be detected is short-circuited according to the current reading change condition flowing through the galvanometer.
3. The short circuit detection device according to claim 2, wherein the first resistor has a resistance equal to that of the second resistor; the third and fourth resistances are configured to: the sum of the resistance value of the third resistor and the internal resistance of the device to be detected in the initial state is equal to the sum of the resistance value of the fourth resistor and the internal resistance of the main detection unit.
4. The short circuit detection device of claim 1, wherein the current detection unit is a multimeter.
5. The short circuit detection device of claim 1, wherein the device to be detected comprises a display panel and a flexible circuit board, and the main detection unit comprises a main board.
6. A short circuit detection method performed by the short circuit detection apparatus of any one of claims 1 to 5, the short circuit detection method comprising:
electrically connecting at least two second current outflow ends of the short circuit detection device with at least two second current inflow ends of the device to be detected in a one-to-one correspondence manner, and electrically connecting a second end of the current detection unit with a first current outflow end of the device to be detected;
and determining whether the device to be detected is short-circuited according to the current flowing through the first current outflow end detected by the current detection unit.
7. The short circuit detection method of claim 6, wherein the method comprises:
and determining whether the device to be detected is short-circuited according to whether the current flowing through the first current outflow end detected by the current detection unit changes within a preset time.
8. The short circuit detection method of claim 6, wherein the method comprises:
and performing preset operation on the device to be detected, and determining whether the device to be detected is short-circuited according to whether the current flowing through the first current outflow end detected by the current detection unit changes.
9. The short circuit detection method according to claim 8, wherein if the current flowing through the first current outflow end detected by the current detection unit before the preset operation is performed on the device to be detected is different from the current flowing through the first current outflow end detected by the current detection unit after the preset operation is performed on the device to be detected, it is determined that the device to be detected is short-circuited;
and if the current flowing through the first current outflow end detected by the current detection unit before the preset operation is performed on the device to be detected is the same as the current flowing through the first current outflow end detected by the current detection unit after the preset operation is performed on the device to be detected, determining that the short circuit does not occur in the device to be detected.
10. The short circuit detection method according to claim 6, wherein the current detection unit includes: the current meter comprises a first resistor, a second resistor, a third resistor, a fourth resistor and a galvanometer; the first end of the first resistor is electrically connected with the first end of the second resistor, the first end of the first resistor and the first end of the second resistor are connected with a reference signal, the reference signal is used for providing a reference potential, and the second end of the first resistor is electrically connected with the first end of the third resistor; the second end of the second resistor is electrically connected with the first end of the fourth resistor; a second end of the third resistor is used as a second end of the current detection unit, and a second end of the fourth resistor is used as a first end of the current detection unit; a first end of the galvanometer is connected between the third resistor and the first resistor, and a second end of the galvanometer is connected between the fourth resistor and the second resistor;
the determining whether the device to be detected is short-circuited according to the current flowing through the first current outflow end detected by the current detection unit includes:
if the galvanometer readings are different from the initial readings when the device to be detected is connected into the short circuit detection device, determining that the device to be detected is short-circuited; and if the current indicator of the galvanometer is the same as the initial indicator when the device to be detected is connected into the short circuit detection device, determining that the short circuit does not occur in the device to be detected.
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