CN213028651U - Ripple voltage detection circuit, power control circuit and display device - Google Patents
Ripple voltage detection circuit, power control circuit and display device Download PDFInfo
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Abstract
The application provides a ripple voltage detection circuit, it includes: a voltage comparison unit and a switch control unit; the voltage comparison unit comprises a first comparator and a second comparator, the first comparator comprises a first input end, a second input end and a first output end, the first input end inputs a first reference voltage, and the second input end receives an output voltage; the second comparator comprises a third input end, a fourth input end and a second output end, the third input end receives output voltage, the fourth input end inputs second reference voltage, and the first output end and the second output end are both electrically connected with the switch control unit; when the ripple voltage of the input voltage comparison unit is greater than the preset ripple voltage, the first reference voltage and the second reference voltage are respectively compared with the output voltage, and according to the comparison result, any one of the first comparator and the second comparator outputs a control signal to the switch control unit, and then the switch control unit is switched off according to the control signal. The application also discloses a power supply control circuit.
Description
Technical Field
The utility model relates to a detection circuitry technical field especially relates to a ripple voltage detection circuit and power control circuit and display device who has this ripple voltage detection circuit.
Background
Currently, in the Light Emitting Diode (LED) display industry, a power supply connected to a HUB board (i.e., a patch panel) generally directly uses an Alternating Current (AC) -Direct Current (DC) power supply to perform Current conversion, and performs processing such as rectification and filtering, and a filter capacitor of the AC-DC power supply after secondary rectification is generally an aluminum electrolytic capacitor. However, the electrolyte of the aluminum electrolytic capacitor is less and less along with the increase of time, the reduction of the electrolyte can lead to the reduction of the electric capacity, and the reduction of the electric capacity can lead to the increase of the ripple voltage output by the aluminum electrolytic capacitor. When the ripple voltage of output increases to a certain degree, the stability of LED lamp plate system can receive serious influence, and then leads to the life-span of LED lamp plate system to shorten.
Therefore, how to solve the problem that the service life of the LED lamp panel system is shortened due to the overlarge ripple voltage output by the AC-DC power supply is an urgent need to be solved.
SUMMERY OF THE UTILITY MODEL
In view of the defects of the prior art, an object of the present application is to provide a ripple voltage detection circuit, a power control circuit having the ripple voltage detection circuit, and a display device, which aim to solve the problem that the service life of an LED lamp panel system is shortened due to an excessive ripple voltage output by an AC-DC power supply in the prior art.
A ripple voltage detection circuit, comprising: voltage comparing element and switch control unit, voltage comparing element with switch control unit electric connection, wherein: the voltage comparison unit comprises a first comparator and a second comparator, the first comparator comprises a first input end, a second input end and a first output end, the first input end inputs a first reference voltage, the second input end receives an output voltage, and the first output end is electrically connected with the switch control unit; the second comparator comprises a third input end, a fourth input end and a second output end, the third input end receives the output voltage, the fourth input end inputs a second reference voltage, and the second output end is electrically connected with the switch control unit; the first reference voltage and the second reference voltage are respectively compared with the output voltage, and any one of the first comparator and the second comparator outputs a control signal to the switch control unit according to a comparison result.
Among the above-mentioned ripple voltage detection circuit, can real-time detection ripple voltage's size, when the input voltage comparison unit's ripple voltage is greater than when predetermineeing ripple voltage, first reference voltage with second reference voltage respectively with output voltage carries out the comparison, according to the comparative result first comparator with any output control signal in the second comparator extremely the on-off control unit, the on-off control unit basis control signal switches off to stop for the power supply of back stage circuit, thereby effectual LED lamp plate system of avoiding lasts the work under high ripple voltage state, in order to prolong LED lamp plate system life-span.
Optionally, when a first reference voltage of the first input terminal in the ripple voltage detection circuit is greater than an output voltage of the second input terminal, the first output terminal outputs a low-level voltage signal to the switch control unit; or, when the first reference voltage of the first input terminal is less than the output voltage of the second input terminal, the first output terminal outputs a high-level voltage signal to the switch control unit.
Optionally, in the ripple voltage detection circuit, when a second reference voltage at the fourth input terminal is greater than an output voltage at the third input terminal, the second output terminal outputs a high-level voltage signal to the switch control unit; or, when the second reference voltage of the fourth input terminal is less than the output voltage of the third input terminal, the second output terminal outputs a low-level voltage signal to the switch control unit.
Optionally, the first reference voltage in the ripple voltage detection circuit is not equal to the second reference voltage.
Optionally, the switch control unit in the ripple voltage detection circuit includes a control signal receiving end, a voltage input end and a voltage output end, the voltage input end receives the output voltage, and the voltage output end is electrically connected to the post-stage circuit and supplies power to the post-stage circuit; the control signal receiving end is respectively connected with the first output end and the second output end.
Optionally, the initial state of the switch control unit is a conducting state, and the output voltage received by the voltage input end of the switch control unit supplies power to the post-stage circuit; in the ripple voltage detection circuit, when the switch control unit receives a low-level voltage signal output by any one of the first comparator and the second comparator, the switch control unit is turned off, and the output voltage received by the voltage input end of the switch control unit stops supplying power to the post-stage circuit.
Optionally, the initial state of the switch control unit is a conducting state, and the output voltage received by the voltage input end of the switch control unit supplies power to the post-stage circuit; in the ripple voltage detection circuit, when the switch control unit receives a high-level voltage signal output by any one of the first comparator and the second comparator, the switch control unit is turned off, and the output voltage received by the voltage input end of the switch control unit stops supplying power to the post-stage circuit.
Optionally, the ripple voltage detection circuit further includes a reset unit, where the reset unit is electrically connected to the switch control unit and is configured to reset the switch control unit, so that the switch control unit is switched from an off state to an on state.
Among the above-mentioned ripple voltage detection circuit, on the basis that sets up the comparison unit, set up the unit that resets, when ripple voltage is too big the on-off control unit in time cuts off the circuit in order to stop for the power supply of back stage circuit, it needs right the on-off control unit resets and just enables it and carry out the work of opening again, makes the on-off control unit switches to the on-state by the off-state to remind the staff in time to change the power, thereby avoid LED lamp plate system to last the work under high ripple voltage state, in order to prolong LED lamp plate system life-span.
Based on same utility model conceive, this application still provides a power control circuit, including power conversion circuit, interface circuit and ripple voltage detection circuit, power conversion circuit with voltage comparison unit electric connection, and do voltage comparison unit provides output voltage, interface circuit with on-off control unit electric connection.
To sum up, among the above-mentioned power control circuit, among the ripple voltage detection circuit, the size that can real-time detection ripple voltage, when inputing voltage comparison unit's ripple voltage is greater than when predetermineeing ripple voltage, first reference voltage with second reference voltage respectively with output voltage carries out the comparison, according to the comparison result first comparator with any output control signal in the second comparator extremely the on-off control unit, the on-off control unit basis control signal turns off to stop for the power supply of back stage circuit, thereby the effectual LED lamp plate system of avoiding lasts the work under high ripple voltage state, with extension LED lamp plate system life-span.
Based on same utility model conceive, this application still provides a display device, display device include a plurality of display module with ripple voltage detection circuit, wherein, every display module's power input end all with the on-off control unit connects.
To sum up, among the above-mentioned display device, among the ripple voltage detection circuit, the size that can real-time detection ripple voltage, when inputing voltage comparison unit's ripple voltage is greater than when predetermineeing ripple voltage, first reference voltage with second reference voltage respectively with output voltage carries out the comparison, according to the comparison result first comparator with any output control signal in the second comparator extremely the on-off control unit, the on-off control unit basis control signal turns off to stop for the power supply of back stage circuit, thereby the effectual LED lamp plate system of avoiding lasts the work under high ripple voltage state, with extension LED lamp plate system life-span.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a power control circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a ripple voltage detection circuit disclosed in an embodiment of the present application;
fig. 3 is a schematic circuit diagram of the ripple voltage detection circuit shown in fig. 2;
fig. 4 is another schematic circuit structure diagram of the ripple voltage detection circuit shown in fig. 2.
Description of reference numerals:
100-a power supply control circuit;
10-a power conversion circuit;
11-a power conversion unit;
12-a filtering unit;
20-ripple voltage detection circuit;
21-a voltage comparison unit;
22-a switch control unit;
221-a control signal receiving end;
222-voltage input;
224-voltage output;
23-a reset unit;
24-a first comparator;
241-a first input;
242-a second input terminal;
243-first output;
25-a second comparator;
251-a third input;
252-a fourth input;
253-a second output;
30-interface circuit.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
Currently, in the Light Emitting Diode (LED) display industry, a power supply connected to a HUB board (i.e., a patch panel) generally directly uses an Alternating Current (AC) -Direct Current (DC) power supply to perform Current conversion, and performs processing such as rectification and filtering, and a filter capacitor of the AC-DC power supply after secondary rectification is generally an aluminum electrolytic capacitor. However, the aluminum electrolytic capacitor has a non-negligible disadvantage that the electrolyte is less and less with the increase of time, the reduction of the electrolyte leads to the reduction of the capacitance, and the reduction of the capacitance leads to the increase of the ripple voltage output by the aluminum electrolytic capacitor. When the ripple voltage of output increases to a certain degree, the stability of LED lamp plate system can receive serious influence, and then leads to the life-span of LED lamp plate system to shorten.
Based on this, the present application is expected to provide a technical solution capable of solving the problem of shortened life of an LED lamp panel system caused by an excessive ripple voltage output by an Alternating Current (AC) -Direct Current (DC) power supply, and details of which will be described in the following embodiments.
The detailed explanation of this application scheme ripple voltage detection circuit and this ripple voltage detection circuit's the concrete circuit structure of power control circuit.
Please refer to fig. 1, which is a schematic structural diagram of a power control circuit according to an embodiment of the present disclosure. As shown in fig. 1, the present application provides a power control circuit 100, which includes a power conversion circuit 10, a ripple voltage detection circuit 20, and an interface circuit 30. The power conversion circuit 10 is configured to convert an input current, and perform rectification, filtering and other processing on the converted current, so as to provide an output voltage for the ripple voltage detection circuit 20. Specifically, the power conversion circuit 10 includes a power conversion unit 11 and a filtering unit 12, where the power conversion unit 11 is electrically connected to the filtering unit 12, and is configured to convert an input current, specifically, an input alternating current into a direct current. Since a large amount of ac components still exist in the ac power converted into the pulsating dc power, in order to obtain a smooth dc voltage, a corresponding filter circuit is added after the power conversion unit 11 to filter most of the ac components. The filtering unit 12 receives the dc power output by the power conversion unit 11, and performs rectification, filtering and other processing to filter most ac components in the dc power, so as to provide the rectified and filtered output voltage for the ripple voltage detection circuit 20.
Because the filtering unit 12 may have incomplete filtering, the output voltage still contains a certain ripple alternating current component, which is called ripple voltage, that is, the output voltage output by the power conversion circuit 10 contains a part of ripple voltage. When the ripple voltage in the output voltage is too large, there are many hazards, such as reducing the efficiency of the power supply, disturbing the logic relationship of the digital circuit, and bringing noise interference so that the image device and the sound device cannot work normally, and in order to avoid the above hazards caused by the too large ripple voltage, the power supply control circuit 100 of the present application is provided with the ripple voltage detection circuit 20.
In this embodiment, the ripple voltage detection circuit 20 is electrically connected to the filtering unit 12 and the interface circuit 30, and is configured to detect a magnitude of the ripple voltage, and is in an off state when the ripple voltage is greater than a preset ripple voltage, so as to stop supplying power to the interface circuit 30. Specifically, the ripple voltage detection circuit 20 detects the magnitude of the ripple voltage in real time, and when the ripple voltage is smaller than the preset ripple voltage, the ripple voltage detection circuit 20 is in a conducting state and supplies power to the interface circuit 30 and other subsequent circuits; when ripple voltage is greater than or equal to when predetermineeing ripple voltage, ripple voltage detection circuit 20 switches to the off-state to stop giving back stage circuit power supplies such as interface circuit 30, then sets up the LED lamp plate on interface circuit 30 and extinguishes, thereby effectually avoids LED lamp plate system to last work under high ripple voltage state, in order to prolong LED lamp plate system life-span. The interface circuit 30 is used for transmitting a voltage signal to a subsequent stage circuit. It should be noted that, when the ripple voltage is greater than the preset ripple voltage, the output voltage may be increased or decreased.
In the embodiment of the present application, the power conversion circuit 10 may be specifically an AC-DC power supply, and the AC-DC power supply may convert an alternating voltage into a direct voltage and may keep a potential difference between two poles of the direct voltage constant. In this embodiment, the interface circuit 30 specifically can be a HUB board, and the HUB board is the interface keysets, because the restriction of LED lamp plate area, the position of output interface is limited, then needs to expand with the HUB board, but does not regard this as the limit.
Please refer to fig. 2, which is a schematic diagram of a specific structure of the power control circuit shown in fig. 1. As shown in fig. 2, the ripple voltage detection circuit 20 provided by the present application includes a voltage comparison unit 21 and a switch control unit 22. The voltage comparison unit 21 is electrically connected to the switch control unit 22, and is configured to detect a magnitude between the ripple voltage and the preset ripple voltage in real time, and when the ripple voltage is smaller than the preset ripple voltage, the switch control unit 22 is in a conducting state and supplies power to a subsequent circuit such as the interface circuit 30; when ripple voltage is greater than or equal to when predetermineeing ripple voltage, voltage comparison unit 21 outputs corresponding control signal, in order to control on-off control unit 22 switches to the off-state by the on-state, in order to stop giving the power supply of post circuit such as interface circuit 30, then sets up the LED lamp plate on interface circuit 30 and extinguishes to effectual LED lamp plate system of avoiding lasts under the high ripple voltage state, in order to prolong LED lamp plate system life-span. It is understood that, in the embodiment of the present application, the switch control unit 22 is initially in the on state all the time, that is, the initial state of the switch control unit 22 is the on state.
Please refer to fig. 3, which is a schematic circuit diagram of the ripple voltage detection circuit shown in fig. 2. As shown in fig. 3, the first comparator 24 and the second comparator 25 of the voltage comparison unit 21 in the ripple voltage detection circuit 20. The first comparator 24 includes a first input terminal 241, a second input terminal 242, and a first output terminal 243, wherein the first input terminal 241 inputs a first reference voltage VRef1The second input end 242 is electrically connected to the filter unit 12 and receives the output voltage Power _ V output by the filter unit 12oThe first output end 243 is electrically connected to the switch control unit 22 and is based on a first reference voltage VRef1And the output voltage Power _ VoThe comparison result is output to the switch control unit 22 as a high level voltage signal or a low level voltage signal. Specifically, the first comparator 24 compares the first reference voltage V with the second reference voltage VRef1And an output voltage Power _ VoPerforming a logic operation when the first reference voltage V of the first input terminal 241 is appliedRef1The output voltage Power _ V is larger than that of the second input end 242oWhen the voltage is detected, the first output terminal 243 outputs a low level voltage signal to the switch control unit 22; when the first reference voltage V of the first input terminal 241Ref1Output voltage Power _ V smaller than the second input terminal 242oAt this time, the first output terminal 243 outputs a high level voltage signal to the switch control unit 22.
The second comparator 25 includes a third input end 251, a fourth input end 252 and a second output end 253, the third input end 251 is electrically connected to the filtering unit 12 and receives the filteringOutput voltage Power _ V output by unit 12oA second reference voltage V is input to the fourth input terminal 252Ref2The second output terminal 253 is electrically connected to the switch control unit 22 and is based on a second reference voltage VRef2And the output voltage Power _ VoThe comparison result is output to the switch control unit 22 as a high level voltage signal or a low level voltage signal. Specifically, the second comparator 25 compares the second reference voltage V with the second reference voltage VRef2And the output voltage Power _ VoPerforming a logic operation when the second reference voltage V of the fourth input terminal 252 is appliedRef2The output voltage Power _ V is larger than that of the third input end 251oWhen the voltage is applied, the second output terminal 253 outputs a high-level voltage signal to the switch control unit 22; when the second reference voltage V of the fourth input terminal 252 is higherRef2The output voltage Power _ V is smaller than that of the third input end 251oAt this time, the second output terminal 253 outputs a low level voltage signal to the switch control unit 22. In an embodiment of the present application, the first reference voltage is not equal to the second reference voltage. The second input end 242 and the third input end 251 are electrically connected to each other and receive the output voltage Power _ V output by the filter unit 12o。
The switch control unit 22 includes two control signal receiving terminals 221, a voltage input terminal 222 and a voltage output terminal 224, wherein the control signal receiving terminal 221 is electrically connected to the first output terminal 243 and the second output terminal 253, and the voltage output terminal 224 receives an output voltage Power _ VoThe voltage output end 224 is electrically connected to the interface circuit 30 and other subsequent circuits, and supplies power to the interface circuit 30 and other subsequent circuits.
As can be seen from the above, the initial state of the switch control unit 22 is the conducting state, and at this time, the output voltage Power _ V received by the voltage input terminal 222 of the switch control unit 22oPower is supplied to subsequent stages of the interface circuit 30 through a voltage output 224. When the switch control unit 22 receives a low-level voltage signal output by any one of the first comparator 24 and the second comparator 25, the switch control unit is enabled to control the switch22 is turned off, i.e. the switch control unit 22 is in an off state, the output voltage Power _ V received by the voltage input 222 of the switch control unit 22oThe power supply to the subsequent stage circuits such as the interface circuit 30 is stopped. That is, when the ripple voltage input to the voltage comparing unit 21 is greater than the preset ripple voltage, the first reference voltage and the second reference voltage are respectively compared with the output voltage, and according to the comparison result, any one of the first comparator 24 and the second comparator 25 outputs a control signal to the switch control unit 22, and the switch control unit 22 is turned off according to the control signal.
It is understood that, according to different circuit structure requirements, the switch control unit 22 may be configured to make the switch control unit 22 in an off state when receiving a high-level voltage signal output by any one of the first comparator 24 and the second comparator 25, and the output voltage Power _ V received by the voltage input terminal 222 of the switch control unit 22oThe application is not limited in this respect to stopping power supply to the subsequent circuits such as the interface circuit 30. In the embodiment of the present application, the control signal output by the voltage comparing unit 21 may be a low-level voltage signal or a high-level voltage signal. The first comparator 24 and the second comparator 25 may be voltage comparators.
Because there may be incomplete filtering in the filtering unit 12, the output voltage still contains a certain pulsating alternating current component, that is, the output voltage Power _ V output by the Power conversion circuit 10oThe ripple voltage is included in the output voltage, and when the ripple voltage is too large, for example, the ripple voltage is larger than a preset ripple voltage, the output voltage is increased or decreased. Therefore, when the ripple voltage is greater than the preset ripple voltage, the output voltage Power _ V of the Power conversion circuit 10 is caused to beoIs increased or decreased, and the output voltage Power _ V appearsoIs less than the first reference voltage VRef1Or greater than the second reference voltage VRef2At this time, the first comparator 24 or the second comparator 25 outputs a low level voltage signal to the switch control unit 22, so that the switch is turned on or offThe control unit 22 is turned off and stops supplying power to the interface circuit 30. When the ripple voltage is less than or equal to the preset ripple voltage, the output voltage Power _ V of the Power conversion circuit 10oIs greater than the first reference voltage VRef1And is less than the second reference voltage VRef2At this time, the first comparator 24 and the second comparator 25 both output high level voltage signals to the switch control unit 22, the switch control unit 22 is not turned off, that is, the switch control unit 22 is in a conducting state, and the output voltage Power _ V received by the voltage input terminal 222 of the switch control unit 22oPower is supplied to the interface circuit 30 through a voltage output 224.
For convenience of description, taking the output voltage Power _ Vo of the Power conversion circuit 10 as 3.8V as an example, if the ripple voltage is allowed to be set to 1000mv, that is, the preset ripple voltage is 1000mv, the first reference voltage V is correspondingly setRef1Set to 3.3V, the second reference voltage VRef2The ripple voltage is set to 4.3V, and it is understood that the preset ripple voltage (i.e. the allowable ripple voltage) can be set by itself according to a specific circuit structure, and is not limited thereto. When the ripple voltage exceeds 1000mv, that is, when the ripple voltage exceeds the preset ripple voltage, the output voltage Power _ V appearsoLess than 3.3V or more than 4.3V, i.e. output voltage Power _ VoIs less than the first reference voltage VRef1Or greater than the second reference voltage VRef2At this moment, first comparator 24 or second comparator 25 output low level voltage signal extremely on-off control unit 22 for on-off control unit 22 breaks off, and stops giving interface circuit 30 supplies power, thereby has realized the size of real-time detection ripple voltage, and in time the cutting off circuit in order to stop giving when detecting ripple voltage too big back stage circuit power supplies such as interface circuit 30, then sets up the LED lamp plate on interface circuit 30 and extinguishes, thereby effectual LED lamp plate system of avoiding lasts under the work in high ripple voltage state, in order to prolong LED lamp plate system life-span.
Therefore, it can be seen from the above that, in the ripple voltage detection circuit 20 provided in the present application, through the circuit design of the switch control unit 22, the first comparator 24 and the second comparator 25, it is realized that when the ripple voltage output by the power conversion circuit 10 is too large, the switch control unit 22 is switched to the off state, so as to realize the real-time detection of the ripple voltage. Moreover, when ripple voltage is too big the switch control unit 22 in time cuts off the circuit in order to stop giving the power supply of post-stage circuits such as interface circuit 30, then set up the LED lamp plate on interface circuit 30 and extinguish to the effectual LED lamp plate system of avoiding lasts under the work in high ripple voltage state of LED lamp plate system life-span is in order to prolong LED lamp plate system.
Please refer to fig. 4, which is another schematic diagram of the ripple voltage detection circuit shown in fig. 2. As shown in fig. 4, the ripple voltage detection circuit 20 according to the embodiment of the present application includes the voltage comparison unit 21, the switch control unit 22, and a reset unit 23. Wherein, when the output voltage Power _ V of the Power conversion circuit 10oIs less than the first reference voltage VRef1Or greater than the second reference voltage VRef2At this time, the first comparator 24 or the second comparator 25 outputs a low-level voltage signal to the switch control unit 22, so that the switch control unit 22 is turned off, and at this time, the switch control unit 22 needs to be reset to be turned on again, that is, the switch control unit 22 is switched from the off state to the on state. Based on this, the reset unit 23 is electrically connected to the switch control unit 22, and is configured to reset the switch control unit 22, so that the switch control unit 22 is switched from the off state to the on state.
The present application further provides a display device, the display device includes a plurality of display modules and the ripple voltage detection circuit 20 of the embodiment shown in fig. 3, wherein, each of the power input terminals of the display modules is connected to the switch control unit 22 of the ripple voltage detection circuit 20. In this application embodiment, the display module can be the HUB lamp plate, also can be the display area of a plurality of LED matrix arrangements, and this application does not do specific restriction to this.
To sum up, among the above-mentioned display device, among ripple voltage detection circuit 20, the size that can real-time detection ripple voltage, when inputing voltage comparison unit's ripple voltage is greater than when predetermineeing ripple voltage, first reference voltage with second reference voltage respectively with output voltage compares, according to the comparison result first comparator 24 with any output control signal in the second comparator 25 extremely switch control unit 22, switch control unit 22 basis control signal cuts off to stop for the power supply of back stage circuit, thereby the effectual LED lamp plate system of avoiding lasts under the work of high ripple voltage state, with extension LED lamp plate system life-span.
It should be understood that the application of the present application is not limited to the above examples, and that modifications or changes may be made by those skilled in the art based on the above description, and all such modifications and changes are intended to fall within the scope of the appended claims.
Claims (10)
1. A ripple voltage detection circuit, comprising: voltage comparing element and switch control unit, voltage comparing element with switch control unit electric connection, wherein:
the voltage comparison unit comprises a first comparator and a second comparator, the first comparator comprises a first input end, a second input end and a first output end, the first input end inputs a first reference voltage, the second input end receives an output voltage, and the first output end is electrically connected with the switch control unit; the second comparator comprises a third input end, a fourth input end and a second output end, the third input end receives the output voltage, the fourth input end inputs a second reference voltage, and the second output end is electrically connected with the switch control unit; the first reference voltage and the second reference voltage are respectively compared with the output voltage, and any one of the first comparator and the second comparator outputs a control signal to the switch control unit according to a comparison result.
2. The ripple voltage detection circuit of claim 1,
when the first reference voltage of the first input end is greater than the output voltage of the second input end, the first output end outputs a low-level voltage signal to the switch control unit;
or the like, or, alternatively,
when the first reference voltage of the first input end is smaller than the output voltage of the second input end, the first output end outputs a high-level voltage signal to the switch control unit.
3. The ripple voltage detection circuit of claim 2,
when the second reference voltage of the fourth input end is greater than the output voltage of the third input end, the second output end outputs a high-level voltage signal to the switch control unit;
or the like, or, alternatively,
when the second reference voltage of the fourth input terminal is less than the output voltage of the third input terminal, the second output terminal outputs a low level voltage signal to the switch control unit.
4. The ripple voltage detection circuit of any one of claims 1 to 3, wherein the first reference voltage is not equal to the second reference voltage.
5. The ripple voltage detection circuit according to claim 1, wherein the switch control unit includes a control signal receiving terminal, a voltage input terminal and a voltage output terminal, the voltage input terminal receives the output voltage, and the voltage output terminal is electrically connected to the post-stage circuit and supplies power to the post-stage circuit;
the control signal receiving end is respectively connected with the first output end and the second output end.
6. The ripple voltage detection circuit according to claim 5, wherein the initial state of the switch control unit is a conducting state, and the output voltage received by the voltage input terminal of the switch control unit supplies power to the subsequent circuit; when the switch control unit receives a low-level voltage signal output by any one of the first comparator and the second comparator, the switch control unit is switched off, and the output voltage received by the voltage input end of the switch control unit stops supplying power to the rear-stage circuit.
7. The ripple voltage detection circuit according to claim 5, wherein the initial state of the switch control unit is a conducting state, and the output voltage received by the voltage input terminal of the switch control unit supplies power to the subsequent circuit; when the switch control unit receives a high-level voltage signal output by any one of the first comparator and the second comparator, the switch control unit is switched off, and the output voltage received by the voltage input end of the switch control unit stops supplying power to the rear-stage circuit.
8. The ripple voltage detection circuit according to claim 5, further comprising a reset unit electrically connected to the switch control unit, for resetting the switch control unit, so that the switch control unit is switched from an off state to an on state.
9. A power control circuit, comprising a power conversion circuit, an interface circuit and the ripple voltage detection circuit according to any one of claims 1 to 8, wherein the power conversion circuit is electrically connected to the voltage comparison unit and provides the output voltage to the voltage comparison unit, and the interface circuit is electrically connected to the switch control unit.
10. A display device comprising a plurality of display modules and the ripple voltage detection circuit of any one of claims 1 to 8;
and the power supply input end of each display module is connected with the switch control unit.
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| US11915654B1 (en) | 2022-08-26 | 2024-02-27 | HKC Corporation Limited | Power-supply voltage generator for outputting varied voltages to display panel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11915654B1 (en) | 2022-08-26 | 2024-02-27 | HKC Corporation Limited | Power-supply voltage generator for outputting varied voltages to display panel |
| WO2024040833A1 (en) * | 2022-08-26 | 2024-02-29 | 惠科股份有限公司 | Driving circuit of display panel, and display apparatus |
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