CN110544453A - Display device - Google Patents
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- CN110544453A CN110544453A CN201910829624.7A CN201910829624A CN110544453A CN 110544453 A CN110544453 A CN 110544453A CN 201910829624 A CN201910829624 A CN 201910829624A CN 110544453 A CN110544453 A CN 110544453A
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- 238000005070 sampling Methods 0.000 claims abstract description 97
- 238000001514 detection method Methods 0.000 claims abstract description 34
- 238000002955 isolation Methods 0.000 claims description 14
- 230000003287 optical effect Effects 0.000 claims description 10
- 230000007935 neutral effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 8
- 239000003990 capacitor Substances 0.000 description 6
- 238000001914 filtration Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- 235000008429 bread Nutrition 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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Abstract
The invention discloses a display device, which comprises a power failure detection module and a control module, wherein the power failure detection module comprises a sampling circuit, a comparison circuit and a switch circuit, the sampling circuit samples an input alternating current signal or an output signal of a rectification circuit and sends the sampling signal to a first input end of the comparison circuit, a second input end of the comparison circuit is connected with a reference voltage, an output end of the comparison circuit is connected with a control end of the switch circuit, the control module detects the conduction state of the switch circuit and carries out power failure judgment according to the conduction state of the switch circuit, and when the power failure judgment is power failure, power failure action is executed. The display device can timely judge the power failure state of the electronic equipment by sampling the alternating current input voltage or the direct current output voltage of the rectifier circuit, so that the power failure protection can be timely executed, and the reliability is high.
Description
Technical Field
The invention belongs to the technical field of voltage detection, and particularly relates to a display device.
Background
The current electronic equipment carries out filtering rectification on input alternating current by a power supply module, outputs direct current supply voltage to a mainboard after AC-DC conversion and DC conversion, in order to prevent a hard disk and mainboard data which store a large amount of data from being lost caused by sudden power failure, the current electronic equipment is generally provided with a power failure protection function, and takes certain protection measures when the power failure is detected. The power failure detection mode mainly adopted at present is judged by detecting the condition of direct current supply voltage output to a mainboard, when the direct current supply voltage cannot be detected, the power failure is judged, and under the conditions of quick startup and shutdown, poor plug-in power and the like, the power failure detection mode is easy to detect inaccurately, so that the problems of display screen splash, storage data loss and the like are caused.
Disclosure of Invention
The invention provides a display device aiming at the technical problem of poor timeliness of voltage state detection in the prior art, and can solve the problem.
In order to realize the purpose of the invention, the invention is realized by adopting the following technical scheme:
Including falling electric detection module and control module, fall electric detection module and include sampling circuit, comparison circuit and switch circuit, sampling circuit samples the alternating current signal of input or the output signal of rectifier circuit to with sampling signal send to comparison circuit's first input, reference voltage is connected to comparison circuit's second input, comparison circuit's output with switch circuit's control end is connected, control module detects switch circuit's the on-state and according to switch circuit's the on-state falls the electricity and judges, when judging for falling the electricity, carries out and falls the electricity action.
Further, the sampling circuit at least comprises a first sub-sampling circuit and a second sub-sampling circuit which are connected in series, the first input end of the comparison circuit is connected between the first sub-sampling circuit and the second sub-sampling circuit, and the first sub-sampling circuit comprises a resistor or a plurality of resistors which are connected in series.
Further, a first input end of the comparison circuit is a non-inverting input end, and a second input end of the comparison circuit is an inverting input end.
Furthermore, the first input end of the comparison circuit is also connected with a current limiting resistor.
And further, the voltage detection circuit further comprises an isolation circuit, wherein a receiving end of the isolation circuit is connected with the switch circuit, and a transmitting end of the isolation circuit is connected with the voltage detection end.
Furthermore, the isolation circuit comprises an optical coupler, a light emitter of the optical coupler is connected with the switch circuit in series, one end of a light receiver of the optical coupler is connected with the direct-current power supply, the other end of the light receiver is connected with the ground end through a voltage dividing resistor, and a detection end of the control module is connected between the light receiver and the voltage dividing resistor.
Further, the switch circuit is an NMOS transistor, a gate of the NMOS transistor is connected to an output terminal of the comparison circuit, a source is connected to ground, and a drain is connected to a dc power supply, or,
The switching circuit is an NPN triode, the base of the NPN triode is connected with the output end of the comparison circuit, the emitting electrode of the NPN triode is connected with the ground end, and the collecting electrode of the NPN triode is connected with the direct-current power supply.
Furthermore, if the sampling circuit samples the input alternating current signal, one end of the sampling circuit is connected with the zero line end and/or the fire line end, and the other end of the sampling circuit is connected with the ground end.
Furthermore, a rectifier diode is connected between the zero line end and/or the fire line end and the sampling circuit, and the cathode of the rectifier diode is connected with the sampling circuit.
Furthermore, if the sampling circuit samples the output signal of the rectifying circuit, one end of the sampling circuit is connected with the voltage output end of the rectifying circuit, and the other end of the sampling circuit is connected with the ground end.
Compared with the prior art, the invention has the advantages that: the display device judges the existence state of the alternating current input signal or the direct current output signal by sampling the alternating current input voltage or the direct current output voltage of the rectifying circuit, because the rectifying circuit is positioned at the front end of the power module, the existence state of the input signal directly reflects whether the electrical equipment has the alternating current voltage input or not, the existence state of the output signal directly determines whether the power module has the direct current voltage output or not, whether the existence state of the input signal of the rectifying circuit or the existence state of the output signal of the rectifying circuit exists or not can directly determine whether the direct current voltage output is supplied to a main board positioned at the rear end or not, because the rectifying circuit is positioned at the front end of the power module, other voltage processing modules positioned at the rear end of the rectifying circuit also have components such as capacitors and the like, the power failure has the delay performance, and by detecting the, the power failure state of the electronic equipment can be judged in time, so that power failure protection can be executed in time, and the reliability is high.
Other features and aspects of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic block diagram of a power module of a display device according to an embodiment of the present invention;
Fig. 2 is a schematic block diagram of a display device according to the present invention;
FIG. 3 is a schematic block diagram of a display device according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a circuit corresponding to FIG. 3;
Fig. 5 is a schematic block diagram of a circuit of a display device according to still another embodiment of the present invention;
Fig. 6 is a schematic diagram of a circuit corresponding to fig. 5.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As the demand for obtaining information is continuously increasing, various types of display devices, such as computers, televisions, projectors, and the like, are being developed. The power module is one of the most important circuit structures in the display device, and the power module can provide electric energy for the display device, so that the display device can normally operate. As shown in fig. 1, the power module includes a filter circuit, a rectifier circuit, an AC-DC conversion circuit, a DC-DC conversion circuit, etc. which are respectively used for filtering, rectifying, AC-DC converting, and DC-DC converting the input AC power and then outputting the DC power supply voltage to the motherboard, the current power-down protection function determines whether to power down by detecting the state of the DC power supply voltage output by the DC-DC conversion circuit of the power module to the motherboard of the display device, because the DC voltage output of the power module is basically located at the extreme end of the power module, because the power module uses a large electrolytic capacitor energy storage element, the power-down has a delay property, after the input end of the power module is powered down for a certain time, the DC voltage output at the rear end of the power module can be detected, that is, the existing detection mode has a hysteresis property.
In order to solve the above problems, this embodiment provides a display device, which includes a power-down detection module and a control module, as shown in fig. 2, the power-down detection module includes a sampling circuit, a comparison circuit and a switch circuit, the sampling circuit samples an input signal of a power module or an output signal of the power module and sends the sampling signal to a first input terminal of the comparison circuit, a second input terminal of the comparison circuit is connected to a reference voltage, the comparison circuit compares the sampling signal input by the first input terminal with the reference voltage input by the second input terminal and outputs a comparison result from an output terminal, the output terminal of the comparison circuit is connected to a control terminal of the switch circuit, the comparison result output by the output terminal of the comparison circuit is used to control a conducting state of the switch circuit, so that the control module detects the conducting state of the switch circuit and performs a power-down determination according to the conducting state of the switch circuit, and when the power failure is judged, executing corresponding power failure protection action.
As shown in fig. 3, the input terminal of the sampling circuit in this embodiment is connected to the input terminal of the rectifying circuit, and is used for sampling the input signal of the rectifying circuit. The rectifier circuit is one part of the power supply module, the rectifier circuit rectifies an input alternating current signal to output a direct current signal, the power failure detection module samples the input alternating current signal to judge whether the alternating current signal input exists or not, whether the power supply module has direct current voltage output or not is determined by directly judging whether the alternating current signal input exists or not, whether the direct current voltage output is provided for a mainboard at the rear end or not can be directly determined correspondingly, and the alternating current signal does not delay any energy storage modules such as capacitors and the like.
The execution of the power-down protection action can be but is not limited to the execution of time sequence control by the mainboard, the data storage and the closing of the load device are carried out in time, the loss of the stored data is prevented, and the system failure rate is reduced.
As shown in fig. 4, which is a schematic circuit diagram of a power-down detection module, an input terminal of a sampling circuit is connected to L/N respectively connected to input terminals of a rectification circuit for sampling an ac voltage input to the rectification circuit, in this embodiment, the sampling circuit at least includes a first sub-sampling circuit and a second sub-sampling circuit connected in series, a first input terminal of a comparison circuit is connected between the first sub-sampling circuit and the second sub-sampling circuit, the first sub-sampling circuit and the second sub-sampling circuit have a voltage division function to divide a sampling voltage, a voltage of the second sub-sampling circuit is collected at a first input terminal of the comparison circuit, when the power is not turned off, the voltage collected at the first input terminal of the comparison circuit is substantially constant, and when the power is turned off, the voltage collected at the first input terminal of the comparison circuit is zero, wherein the first sub-sampling circuit can be implemented by using a resistor, since there is a certain limit value in the voltage that the resistor can withstand, in order to improve the voltage endurance of the first sub-sampling circuit, the optional or first sub-sampling circuit includes a plurality of resistors connected in series, for example, as shown in fig. 4, the first resistor R1, the second resistor R2, and the third resistor R3 are connected in series to form the first sub-sampling circuit, and the input voltage is divided by the plurality of resistors, so that the input voltage can protect the resistors.
similarly, the second sub-sampling circuit may be implemented by using one resistor, or may be formed by connecting a plurality of resistors in series, in this embodiment, since the first sub-sampling circuit divides voltage by using a plurality of resistors, the second sub-sampling circuit may use one resistor, which corresponds to the fourth resistor R4 in fig. 4.
the comparator circuit can be implemented by using a comparator N1A, a first input terminal of the comparator circuit is a non-inverting input terminal of the comparator N1A, and a second input terminal of the comparator circuit is an inverting input terminal of the comparator N1A. The sampling signal is input to the non-inverting input terminal of the comparator N1A, when the sampling signal is greater than the reference voltage input by the inverting input terminal of the comparator N1A, the comparator N1A outputs a high level corresponding to the condition of no power failure, otherwise, the comparator N1A outputs a low level corresponding to the condition of power failure.
As shown in fig. 4, the reference voltage is obtained by sampling the dc input voltage VCC through an eleventh resistor R11 and a twelfth resistor R12 connected in series, and the input reference voltage can be adjusted by adjusting the resistance ratio of the eleventh resistor R11 and the twelfth resistor R12, and the dc input voltage is obtained from the dc output of the power module.
The first input end of the comparison circuit is also connected with a current limiting resistor R5 for limiting the current input to the first input end and preventing the comparator N1A from being damaged by the input large current.
the two ends of the second sub-sampling circuit are also connected in parallel with capacitors for filtering interference signals of the sampling signals, and can output stable signals to the comparator N1A to prevent the interference signals from influencing the judgment of the comparator N1A, specifically, as shown in fig. 3 and 4, the two ends of the fourth resistor R4 are connected in parallel with the first capacitor C1 to play a role in filtering the interference signals of the sampling signals.
When the sampling circuit samples the alternating current signal of input, have the unstable risk of alternating current signal, if directly transmit the mainboard through display device, cause the damage to the mainboard easily, in order to avoid the emergence of above-mentioned condition, still include the buffer circuit in the embodiment, buffer circuit's receiving terminal and switch circuit are connected, and the sending terminal is connected with the voltage detection end. The isolation circuit is used for isolating the sampling signal from the mainboard, prevents that the impact current in the power grid from damaging the mainboard, and the receiving end of the isolation circuit is connected with the switch circuit, and the transmitting end of the isolation circuit is transmitted to the conduction state of the switch circuit in a non-contact mode, and the transmitting end transmits the signal to the mainboard.
as shown in fig. 4, in this embodiment, the isolation circuit may be implemented by using an optical coupler N912, a light emitter of the optical coupler N912 is connected in series with the switch circuit, one end of a light receiver of the optical coupler N912 is connected to the dc power supply, the other end of the light receiver is connected to the ground through a voltage dividing resistor R10, and a detection end AC-DECT of the control module is connected between the light receiver and the voltage dividing resistor R10. When the switch circuit is conducted, the light emitter is lighted, the corresponding light receiver senses signal conduction, therefore, a current path is formed in the branch where the light receiver is located, voltage drop is formed at two ends of the divider resistor R10, the voltage drop is detected by the detection end AC-DECT of the control module and fed back to the main board, otherwise, if the switch circuit is not conducted, the light emitter is not lighted, the circuit where the corresponding light receiver is located does not have current, and the detection end AC-DECT of the control module does not detect a voltage signal. The isolation circuit of the invention is not limited to be realized by adopting an optical coupler, and can also be realized by adopting devices with isolation protection function, such as a magnetic induction isolator, a capacitance isolator and the like.
As shown in fig. 4, the switch circuit in this embodiment may be implemented by using an NMOS transistor VD3, a gate of the NMOS transistor VD3 is connected to an output terminal (corresponding to terminal 1 of the comparator N1A) of the comparison circuit, a source is connected to ground, a drain is connected to the dc power VCC, if the power is not turned off, a sampling signal is greater than a reference voltage input by an inverting input terminal of the comparator N1A, the comparator N1A outputs a high level, the NMOS transistor VD3 is turned on, the light emitter is turned on, the light receiver is a photodiode, therefore, the light receiver is conducted, the detection end AC-DECT of the control module detects that a high level signal is sent to the mainboard, otherwise, when the power is off, the sampling signal is less than the reference voltage input by the inverting input terminal of the comparator N1A, the comparator N1A outputs low level, the NMOS tube VD3 is cut off, the light emitter is not lighted, therefore, the light receiver is not conducted, and the detection end AC-DECT of the control module detects that the low-level signal is sent to the mainboard.
Certainly, the switching circuit is not limited to the above implementation manner, and may also be implemented by using one NPN transistor, where a base of the NPN transistor is connected to the output terminal of the comparison circuit, an emitter is connected to ground, and a collector is connected to the dc power supply. The conduction principle is similar to that of the NMOS tube VD3, and is not described herein.
If the sampling circuit samples the input alternating current signal, as shown in fig. 4, the alternating current signal includes two paths of signals of a zero line N and a live line L, and the two paths of signals have the same frequency and opposite phases, and if the power failure occurs, the zero line N and the live line L do not have any signal, so one end of the sampling circuit can be connected with the zero line end and also can be connected with the live line end for detecting the zero line signal or the live line signal, and any one path of detection signal can directly reflect the power failure condition.
in order to prevent the unstable device that damages display device in of alternating current signal in the electric wire netting, still include filter circuit in the power module, filter circuit is located the front end of rectifier circuit, and alternating current signal passes through filter circuit's filtering earlier and inputs to rectifier circuit, if the sampling circuit samples the alternating current signal of input, optional its link is connected between filter circuit and rectifier circuit, samples the alternating current signal after filtering, protects the electronic device in the display device.
If the sampled ac signal is directly fed back to the comparator, voltage detection is prone to be inaccurate due to the fact that the current of the ac signal changes constantly, as shown in fig. 4, in this embodiment, a rectifier diode is further connected between the zero line end N and/or the live line end L and the sampling circuit, that is, if the sampling circuit is only connected with the zero line end, a rectifier diode is further connected between the zero line end and the sampling circuit, if the sampling circuit is only connected with the live line end VD1, a rectifier diode VD2 is further connected between the live line end and the sampling circuit, if the sampling circuit is connected with both the zero line end and the live line end, rectifier diodes VD1 and VD2 are respectively connected between the zero line end and the live line end and the sampling circuit, and the cathode of the rectifier diode is connected with the sampling circuit, the rectifier diode is used for rectifying a signal input to the sampling circuit to form a direct current, the accuracy of voltage detection is improved.
Any alternating current signal on all the way has crest and trough, after alternating current signal is rectified, the signal that is located the trough can probably be filtered off, form discontinuous signal, will influence the power failure detection result, optionally be connected simultaneously with zero line and live wire in this embodiment, because the phase place of two way signals of zero line and live wire is opposite, therefore, even by the rectification back, still be continuous steamed bread ripples, improve the accuracy of power failure detection, the other end and the ground connection of sampling circuit, if not power failure, the branch circuit that sampling circuit is located switches on, form the current loop, and then produce the first input end that sampling signal sent to comparison circuit.
The rectifier circuit in the power module is used for rectifying an input alternating current signal and outputting a direct current signal VDD, as shown in fig. 3, the sampling circuit of this embodiment may also sample the direct current signal VDD output by the rectifier circuit, at this time, one end of the sampling circuit is connected to a voltage output end of the rectifier circuit, and the other end is connected to a ground end. If the power failure does not occur, the branch where the sampling circuit is located is conducted to form a current loop, and then a sampling signal is generated and sent to the first input end of the comparison circuit. When the direct current signal output by the rectifying circuit is sampled, the front end of the sampling circuit does not need to be provided with a rectifying diode, so that the cost expenditure of the rectifying diode can be saved. It can be understood that the sampling circuit samples the input alternating current signal more ahead than the sampling end for sampling the output direct current signal of the rectifier circuit, and the detection response speed is more timely.
in a second embodiment, the present embodiment provides another connection type power failure detection module, as shown in fig. 5, the power failure detection module in this embodiment includes a sampling circuit, a comparing circuit and a switching circuit, where structures of the comparing circuit and the switching circuit are the same as those in the above embodiments, and are not described here, and it is to be particularly described that the sampling circuit in this embodiment samples a dc output signal of the rectifying circuit, and further determines whether the rectifying circuit has a dc signal output, because the rectifying circuit is located at the foremost end or closer to the frontmost end of all functional circuits in the power module, a presence state of an output signal thereof directly reflects whether other functional circuits in the power module have voltage signal inputs, and also determines whether the power module has a dc voltage output, and further determines whether the power module has a dc voltage output to supply to a motherboard located at the backend, because the rectifying circuit is positioned at the front end of the power supply module, the output signal of the rectifying circuit does not need to pass through the delay of the large electrolytic capacitor energy storage module positioned at the rear end of the rectifying circuit, and therefore the power failure state of the electronic equipment can be judged in time by detecting the output signal of the rectifying circuit, so that the power failure protection action can be executed in time, and the reliability is high.
As shown in fig. 6, which is a schematic circuit diagram of the power down detection module in this embodiment, an input end of the sampling circuit is connected to an output end VDD of the rectification circuit, and is used for sampling the dc voltage output by the rectification circuit. Because the dc voltage is sampled, only one input end is needed to be adopted, and other circuit components of the sampling circuit are the same as those of the adopted circuit in the above embodiment, and are not described herein.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (10)
1. The utility model provides a display device, its characterized in that, includes power down detection module and control module, power down detection module includes sampling circuit, comparison circuit and switch circuit, sampling circuit samples the alternating current signal of input or rectifier circuit's output signal to with sampling signal send to comparison circuit's first input, reference voltage is connected to comparison circuit's second input, comparison circuit's output with switch circuit's control end is connected, control module detects switch circuit's the on-state and according to switch circuit's the on-state judges that falls the power, when judging for falling the power, carries out the power fail safe action.
2. The display device of claim 1, wherein the sampling circuit comprises at least a first sub-sampling circuit and a second sub-sampling circuit connected in series, wherein the first input of the comparison circuit is connected between the first sub-sampling circuit and the second sub-sampling circuit, and wherein the first sub-sampling circuit comprises one resistor or a plurality of resistors connected in series.
3. The display device according to claim 2, wherein the first input terminal of the comparison circuit is a non-inverting input terminal, and the second input terminal of the comparison circuit is an inverting input terminal.
4. The display device according to claim 2, wherein the first input terminal of the comparison circuit is further connected to a current-limiting resistor.
5. The display device according to claim 1, further comprising an isolation circuit, wherein a receiving end of the isolation circuit is connected to the switch circuit, and a transmitting end of the isolation circuit is connected to the voltage detecting end.
6. The display device according to claim 5, wherein the isolation circuit includes an optical coupler, a light emitter of the optical coupler is connected in series with the switching circuit, a light receiver of the optical coupler has one end connected to a dc power supply and the other end connected to a ground terminal through a voltage dividing resistor, and a detection end of the control module is connected between the light receiver and the voltage dividing resistor.
7. The display device according to any one of claims 1 to 6, wherein the switching circuit is an NMOS transistor having a gate connected to the output terminal of the comparison circuit, a source connected to ground, and a drain connected to a DC power supply, or,
The switching circuit is an NPN triode, the base of the NPN triode is connected with the output end of the comparison circuit, the emitting electrode of the NPN triode is connected with the ground end, and the collecting electrode of the NPN triode is connected with the direct-current power supply.
8. The display device according to any one of claims 1 to 6, wherein if the sampling circuit samples an input ac signal, one end thereof is connected to a neutral terminal and/or a live terminal, and the other end thereof is connected to a ground terminal.
9. The display device according to claim 8, wherein a rectifying diode is further connected between the zero line end and/or the fire line end and the sampling circuit, and a cathode of the rectifying diode is connected with the sampling circuit.
10. The display device according to any one of claims 1 to 6, wherein if the sampling circuit samples the output signal of the rectifying circuit, one end thereof is connected to a DC voltage output terminal of the rectifying circuit, and the other end thereof is connected to a ground terminal.
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| CN201910829624.7A CN110544453A (en) | 2019-09-03 | 2019-09-03 | Display device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111077356A (en) * | 2019-12-16 | 2020-04-28 | 广东格兰仕集团有限公司 | Current detection circuit, method, apparatus and storage medium |
| CN115424571A (en) * | 2022-09-20 | 2022-12-02 | 惠科股份有限公司 | Power supply circuit, display panel and display device |
| CN115561671A (en) * | 2022-04-29 | 2023-01-03 | 荣耀终端有限公司 | Power failure detection circuit and display device |
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