CN214380047U - Voltage protection circuit and Miro-LED display - Google Patents
Voltage protection circuit and Miro-LED display Download PDFInfo
- Publication number
- CN214380047U CN214380047U CN202023350810.XU CN202023350810U CN214380047U CN 214380047 U CN214380047 U CN 214380047U CN 202023350810 U CN202023350810 U CN 202023350810U CN 214380047 U CN214380047 U CN 214380047U
- Authority
- CN
- China
- Prior art keywords
- voltage
- protection
- module
- comparator
- protection circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The embodiment of the utility model discloses voltage protection circuit and Miro-LED display. The voltage protection circuit includes: the device comprises a filtering module, a first switch, a comparator, a voltage division module and a protection module; the input end of the comparator is connected to the first voltage division node through the first switch, and the reference voltage end of the comparator is used for receiving reference voltage; the filter circuit is connected between the input end of the comparator and the ground; the input end of the protection module is connected to the output end of the comparator, and the output end of the protection module is connected to the second voltage division node. The power supply voltage is compared with the reference voltage through the voltage protection circuit consisting of the filtering module, the first switch, the comparator, the voltage division module and the protection module, the driving circuit stops working when the voltage is not consistent with a preset value, the problem that the display effect and the service life of the Micro-LED are affected due to the voltage protection problem is solved, and the display effect and the service life effect of the Micro-LED are improved.
Description
Technical Field
The embodiment of the utility model provides a relate to the electronic science technique, especially relate to a voltage protection circuit and Miro-LED display.
Background
Micro Light-Emitting diodes (Micro-LEDs) have self-luminous display characteristics, are all-solid-state LEDs, have long life, high brightness, low power consumption, small size, and ultra-high resolution, can be applied to extreme environments such as high temperature or radiation, and are planned as a new generation of display technology by more and more manufacturers.
The product morphology of Micro-LED can be divided into two directions: a Micro-display of high pixel density (PPI (Pixels Per inc) >1000) Micro-LED array and a larger size display screen of low pixel density (PPI <1000) Micro-LED array. The driving method for the Micro-LED is classified into a high pixel density display driving and a low pixel density display driving. However, the problem of voltage protection in the Micro-LED display driving circuit is more prominent, and the display effect and the service life of the Micro-LED are reduced.
SUMMERY OF THE UTILITY MODEL
The utility model provides a voltage protection circuit and Miro-LED display to realize the voltage protection to drive circuit, thereby improve Micro-LED's display effect and life.
To achieve the purpose, the utility model adopts the following technical proposal:
in a first aspect, an embodiment of the present invention provides a voltage protection circuit, including: a filtering module, a first switch, a comparator, a voltage division module and a protection module,
the voltage division module at least comprises a first voltage division node and a second voltage division node, and the output voltage of the first voltage division node is greater than that of the second voltage division node;
the input end of the comparator is connected to the first voltage division node through the first switch, and the reference voltage end of the comparator is used for receiving a reference voltage;
the filter circuit is connected between the input end of the comparator and the ground;
the input end of the protection module is connected to the output end of the comparator, and the output end of the protection module is connected to the second voltage division node.
Optionally, the voltage dividing module includes a first voltage dividing resistor, a second voltage dividing resistor, and a third voltage dividing resistor connected in series in sequence;
a first end of the first voltage-dividing resistor is connected to a power supply, a second end of the third voltage-dividing resistor is grounded, a node between the first voltage-dividing resistor and the second voltage-dividing resistor is a first voltage-dividing node, and a node between the second voltage-dividing resistor and the third voltage-dividing resistor is a second voltage-dividing node.
Optionally, the filtering module includes a fourth resistor, and the fourth resistor is connected between the first switch and the input end of the comparator.
Optionally, the voltage protection circuit further includes a second switch, the filtering module further includes a first capacitor, and the second switch is connected in parallel to two ends of the first capacitor.
Optionally, the controller is connected to the first switch and the second switch, and is configured to control the first switch and the second switch to be not closed or opened at the same time.
Optionally, when the voltage protection circuit is powered on, after the reference voltage reaches a preset reference voltage, the controller controls the first switch to be closed, and the second switch is opened.
Optionally, when the power supply voltage of the voltage protection circuit is smaller than a preset first protection voltage, the comparator outputs a normal working signal, and the protection module directly grounds the second voltage division node; when the power supply voltage of the voltage protection circuit is larger than a preset first protection voltage, the comparator outputs an overvoltage protection signal, the protection module disconnects the second voltage division node from the grounding point according to the overvoltage protection signal so as to pull up the voltage of the first voltage division node, and the pulled-up voltage of the first voltage division node maintains the output of the overvoltage protection signal.
Optionally, when the power supply voltage of the voltage protection circuit is reduced from being greater than the preset first protection voltage to being less than the preset second protection voltage, the comparator outputs a normal working signal, and the protection module grounds the second voltage division node according to the normal working signal to reduce the voltage of the first voltage division node.
Optionally, the protection module is a switch tube.
In a second aspect, embodiments of the present invention provide a Miro-LED display, including a voltage protection circuit as described in any one of the first aspects.
The utility model discloses a voltage protection circuit by filter module, first switch, comparator, partial pressure module and protection module are constituteed compares supply voltage with reference voltage, and Micro-LED matrix stops image output when the voltage is not conform to the default, solves because the problem of the display effect and the life of the influence Micro-LED that voltage protection problem leads to, realizes having improved Micro-LED's display effect and life effect.
Drawings
Fig. 1 is a schematic structural diagram of a voltage protection circuit according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of input/output characteristics of overvoltage protection of a voltage protection circuit according to a first embodiment of the present invention;
fig. 3 is a schematic diagram of the input/output characteristics of the under-voltage protection of the voltage protection circuit according to a first embodiment of the present invention;
fig. 4 is a schematic structural diagram of a Micro-LED display provided in the second 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.
Example one
The embodiment of the utility model provides a voltage protection circuit, as shown in figure 1, include: a filtering module 10, a first switch S1, a comparator P1, a voltage dividing module 20 and a protection module 30,
the voltage division module 30 at least comprises a first voltage division node a and a second voltage division node b, wherein the output voltage of the first voltage division node a is greater than that of the second voltage division node b;
an input terminal Vin of the comparator P1 is connected to the first voltage dividing node a through the first switch S1, and a reference voltage terminal Vref of the comparator P1 is used for receiving a reference voltage;
the filter circuit 10 is connected between the input terminal Vin of the comparator P1 and ground;
the input terminal c of the protection module 30 is connected to the output terminal Vout of the comparator P1, the output terminal d of the protection module 30 is connected to the second voltage-dividing node b, and the protection module 30 is grounded through the e pin.
The power supply is connected with the voltage division module 30 so as to input the power supply voltage VDD to the voltage protection circuit, the input end Vin of the comparator P1 obtains the voltage at the first voltage division node a, and the reference voltage end Vref receives a preset reference voltage; the voltage at the first node a increases with the increase of the supply voltage VDD, the comparator P1 outputs a protection signal according to the comparison result of the voltage at the first voltage division node a and the reference voltage, the protection module 30 adjusts the voltage at the second voltage division node b according to the protection signal, and the driving circuit stops/normally operates according to the protection signal. The filtering module 10 prevents a protection signal output by the comparator from jumping due to a glitch of the supply voltage, so that the voltage protection circuit can stably operate.
The utility model discloses a voltage protection circuit by filter module, first switch, comparator, partial pressure module and protection module are constituteed compares supply voltage with reference voltage, and Micro-LED matrix stops image output when the voltage is not conform to the default, solves because the problem of the display effect and the life of the influence Micro-LED that voltage protection problem leads to, realizes having improved Micro-LED's display effect and life effect.
With continued reference to fig. 1, optionally, the voltage dividing module 20 includes a first voltage dividing resistor R1, a second voltage dividing resistor R2, and a third voltage dividing resistor R3 connected in series between the power supply VDD and ground in sequence;
the first terminal f of the first voltage-dividing resistor R1 is connected to a power supply, the second terminal g of the third voltage-dividing resistor R3 is grounded, the node between the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 is a first voltage-dividing node a, and the node between the second voltage-dividing resistor R2 and the third voltage-dividing resistor R3 is a second voltage-dividing node b.
When the first switch S1 is closed, the voltage at the input terminal Vin of the comparator P1 is the voltage at the first voltage-dividing node a, and the voltage at the input terminal Vin of the comparator P1 increases with the increase of the power supply voltage under the condition that the resistances of the second voltage-dividing resistor R2 and the third voltage-dividing resistor R3 are stable and unchanged.
Optionally, the filtering module 10 includes a fourth resistor R4, and the fourth resistor R4 is connected between the first switch S1 and the input terminal Vin of the comparator P1.
Optionally, the voltage protection circuit further includes a second switch S2, the filter module 10 further includes a first capacitor C1, and the second switch S2 is connected in parallel to two ends of the first capacitor C1.
The filtering module 10 filters out low frequency signals in the current through the fourth resistor R4 and the first capacitor C1.
Optionally, a controller (not shown) is further included, and the controller is connected to the first switch S1 and the second switch S2, and is configured to control the first switch S1 and the second switch S2 to be not closed or opened at the same time.
Optionally, when the voltage protection circuit is powered on, after the reference voltage reaches the preset reference voltage, the controller controls the first switch S1 to be closed, and the second switch S2 to be opened.
When the reference voltage reaches the preset reference voltage, the controller controls the first switch S1 to be closed and the second switch S2 to be opened, and at this time, the fourth resistor R4 and the first capacitor C1 in the filtering module 10 are both connected to the voltage protection circuit to filter the low-frequency signal in the current; when the reference voltage does not reach the preset reference voltage, the controller controls the first switch S1 to be open-circuited, the second switch S2 to be closed, the fourth resistor R4 in the filter module 10 is not connected to the voltage protection circuit, the first capacitor C1 is connected to the voltage protection circuit, and the first capacitor C1 discharges.
Optionally, when the supply voltage of the voltage protection circuit is greater than the preset first protection voltage, the comparator P1 outputs an overvoltage protection signal, the protection module 30 grounds the second voltage-dividing node b according to the overvoltage protection signal to increase the voltage of the first voltage-dividing node a, and the voltage of the increased first voltage-dividing node a maintains the output of the overvoltage protection signal.
Optionally, when the power supply voltage of the voltage protection circuit is reduced from being greater than the preset first protection voltage to being lower than the preset second protection voltage, the comparator outputs a normal working signal, the protection module 30 connects the third voltage dividing resistor R3 to the voltage protection circuit according to the normal working signal to reduce the voltage of the first voltage dividing node a, and the reduced voltage of the first voltage dividing node a maintains the normal working signal output.
Optionally, the protection module 30 is a switch tube. Specifically, the protection module 30 is an NMOS transistor.
In an embodiment, a reference voltage is selected to be 1.5V, input and output characteristics of the overvoltage protection are shown in fig. 2, a first protection voltage V1 is preset to be 6.0V, a second protection voltage V2 is preset to be 5.25V, a first voltage dividing resistor R1 is 15 Ω, a second voltage dividing resistor R2 is 5 Ω, and a third voltage dividing resistor is 1 Ω; when the power supply voltage VDD is less than 6V, the voltage protection circuit outputs a normal working signal, the normal working signal is a high voltage signal, when the NMOS transistor in the protection module 30 receives the high voltage signal, the NMOS transistor is in a conducting state, the second voltage division node b is directly grounded, the voltage of the first voltage division node a acquired by the comparator P1 is less than 1.5V, the comparator P1 outputs a normal working signal, and the driving circuit connected to the voltage protection circuit operates normally; when the power supply voltage VDD is greater than or equal to 6V, the voltage of the first voltage dividing node a obtained by the comparator P1 is greater than or equal to 1.5V, at this time, the comparator P1 outputs an overvoltage protection signal, the driving circuit connected to the voltage protection circuit stops working, at this time, the overvoltage protection signal is a low voltage signal, when the NMOS transistor in the protection module 30 receives the low voltage signal, the NMOS transistor is in a cut-off state, the second voltage dividing node b is disconnected from the ground point, that is, the third voltage dividing resistor R3 is connected to the voltage protection circuit to increase the voltage of the first voltage dividing node a, the voltage at the input end of the comparator P1 is further increased, at this time, if the power supply voltage fluctuates by a small amplitude, the comparator P1 continuously outputs the overvoltage protection signal; when the power supply voltage VDD is decreased from greater than the preset first protection voltage to less than or equal to 5.25V, the voltage of the first voltage division node a obtained by the comparator P1 is less than or equal to 1.5V, at this time, the comparator P1 outputs a normal signal, the driving circuit connected to the voltage protection circuit normally operates, at this time, the NMOS transistor in the protection module 30 is in a conducting state when receiving a high voltage signal, the third voltage division resistor R3 is short-circuited, that is, the second voltage division node b is grounded, so that the voltage of the first voltage division node a is reduced, the voltage of the input terminal Vin of the comparator P1 is further reduced, at this time, if the power supply voltage fluctuates by a small amplitude, the comparator P1 still continuously outputs a normal operating signal. The preset first protection voltage and the preset second protection voltage can be adjusted by adjusting resistance values of resistors of a voltage division module in the voltage regulation protection circuit, and illustratively, the preset first protection voltage can be set to be 5.5V-6.0V, and the preset second protection voltage can be set to be 4.75V-5.25V.
The structure and principle of the undervoltage protection circuit are similar to those of the overvoltage protection circuit, and the undervoltage protection is specifically described as follows, in an embodiment, the reference voltage is selected to be 1.5V, the input and output characteristics of the undervoltage protection are as shown in fig. 3, the first voltage-dividing resistor R1 is 6 Ω, the second voltage-dividing resistor R2 is 3 Ω, and the third voltage-dividing resistor R3 is 1 Ω; when the power supply voltage VDD is less than 4.5V, the voltage protection circuit outputs an under-voltage protection signal, the under-voltage protection signal is a high-voltage signal, when the NMOS in the protection module 30 receives the high-voltage signal, the NMOS is in a conducting state, the second voltage-dividing node b is directly grounded, the voltage of the first voltage-dividing node a acquired by the comparator P1 is less than 1.5V, the comparator P1 outputs the under-voltage protection signal, and the driving circuit connected to the voltage protection circuit stops working; when the supply voltage VDD of the voltage protection circuit is increased from a small value to more than 4.5V, the voltage of the input terminal Vin of the comparator P1 is equal to 1.5V, the comparator P1 outputs a normal working signal, the driving circuit connected to the voltage protection circuit works normally, the normal working signal is a low voltage signal, the NMOS transistor in the protection module 30 is in a cut-off state when receiving the low voltage signal, and disconnects the second voltage-dividing node b from the ground point, so that the voltage of the first voltage-dividing node a is increased, and at this time, if the supply voltage VDD fluctuates by a small amplitude, the comparator P1 still continuously outputs the normal working signal; when the supply voltage VDD is reduced from greater than 4.5V to less than or equal to 3.75V, the voltage at the input terminal Vin of the comparator P1 is less than or equal to 1.5V, the comparator P1 outputs an under-voltage protection signal, the driving circuit connected to the voltage protection circuit stops working, the NMOS transistor in the protection module 30 is in a conducting state when receiving a high voltage signal, and grounds the second voltage-dividing node b, i.e., short-circuits the third voltage-dividing resistor R3, thereby reducing the voltage at the first voltage-dividing node a, further reducing the voltage at the input terminal Vin of the comparator P1, and at this time, if the supply voltage VDD fluctuates by a small amplitude, the comparator P1 still continuously outputs the under-voltage protection signal. The preset third protection voltage and the preset third protection voltage can be adjusted by adjusting resistance values of resistors of a voltage division module in the voltage regulation protection circuit, and for example, the preset third protection voltage can be set to be 4.0V-4.5V, and the preset third protection voltage can be set to be 3.25V-3.75V.
The utility model provides a voltage protection circuit, under the condition that overvoltage or undervoltage appear in supply voltage, output overvoltage protection signal or undervoltage protection signal for the drive circuit stop work of being connected with voltage protection circuit protects Micro-LED, realizes having improved Micro-LED's display effect and life effect.
Example two
As shown in fig. 4, an embodiment of the present invention provides a Miro-LED display, which includes a voltage protection circuit 1, a power supply chip 40 and a Micro-LED array, wherein only one Micro-LED is shown in the figure; when the voltage protection circuit 1 outputs a normal working signal, the power supply chip 40 supplies power supply voltage VDD to the Micro-LED array, and the Micro-LED array outputs an image; when the voltage protection circuit 1 outputs an overvoltage protection signal or an undervoltage protection signal, the power supply chip 40 does not supply power to the light-emitting Micro-LED array, and the Micro-LED array stops outputting images.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. 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 with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. A voltage protection circuit, comprising: a filtering module, a first switch, a comparator, a voltage division module and a protection module,
the voltage division module at least comprises a first voltage division node and a second voltage division node, and the output voltage of the first voltage division node is greater than that of the second voltage division node;
the input end of the comparator is connected to the first voltage division node through the first switch, and the reference voltage end of the comparator is used for receiving a reference voltage;
the filtering module is connected between the input end of the comparator and the ground;
the input end of the protection module is connected to the output end of the comparator, and the output end of the protection module is connected to the second voltage division node.
2. The voltage protection circuit of claim 1, wherein the voltage dividing module comprises a first voltage dividing resistor, a second voltage dividing resistor and a third voltage dividing resistor connected in series in sequence;
a first end of the first voltage-dividing resistor is connected to a power supply, a second end of the third voltage-dividing resistor is grounded, a node between the first voltage-dividing resistor and the second voltage-dividing resistor is a first voltage-dividing node, and a node between the second voltage-dividing resistor and the third voltage-dividing resistor is a second voltage-dividing node.
3. The voltage protection circuit of claim 1, wherein the filtering module comprises a fourth resistor connected between the first switch and the input of the comparator.
4. The voltage protection circuit of claim 1, further comprising a second switch, wherein the filtering module further comprises a first capacitor, and wherein the second switch is connected in parallel across the first capacitor.
5. The voltage protection circuit of claim 1, further comprising a controller coupled to the first switch and the second switch for controlling the first switch and the second switch to not close or open at the same time.
6. The voltage protection circuit of claim 5, wherein the controller controls the first switch to close and the second switch to open after the reference voltage reaches a preset reference voltage when the voltage protection circuit is powered on.
7. The voltage protection circuit of claim 1, wherein when the supply voltage of the voltage protection circuit is less than a preset first protection voltage, the comparator outputs a normal operation signal, and the protection module directly grounds the second voltage division node; when the power supply voltage of the voltage protection circuit is larger than a preset first protection voltage, the comparator outputs an overvoltage protection signal, the protection module disconnects the second voltage division node from the grounding point according to the overvoltage protection signal so as to pull up the voltage of the first voltage division node, and the pulled-up voltage of the first voltage division node maintains the output of the overvoltage protection signal.
8. The voltage protection circuit of claim 7, wherein when the supply voltage of the voltage protection circuit decreases from greater than the predetermined first protection voltage to less than a predetermined second protection voltage, the comparator outputs a normal operation signal, and the protection module grounds the second voltage division node according to the normal operation signal to decrease the voltage of the first voltage division node.
9. The voltage protection circuit of claim 1, wherein the protection module is a switching tube.
10. A Miro-LED display comprising the voltage protection circuit of any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023350810.XU CN214380047U (en) | 2020-12-31 | 2020-12-31 | Voltage protection circuit and Miro-LED display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023350810.XU CN214380047U (en) | 2020-12-31 | 2020-12-31 | Voltage protection circuit and Miro-LED display |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214380047U true CN214380047U (en) | 2021-10-08 |
Family
ID=77952715
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023350810.XU Active CN214380047U (en) | 2020-12-31 | 2020-12-31 | Voltage protection circuit and Miro-LED display |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214380047U (en) |
-
2020
- 2020-12-31 CN CN202023350810.XU patent/CN214380047U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7129679B2 (en) | Power supply circuit having soft start | |
| US10140931B2 (en) | Shadow mask assemblies and reusing methods of shadow mask assemblies thereof | |
| CN103620760A (en) | Overvoltage protection circuit, power supply apparatus, liquid crystal display apparatus, electronic apparatus, and television set | |
| US8604710B2 (en) | Multi-mode dimming circuit | |
| US9258860B2 (en) | Load driving apparatus relating to light-emitting-diodes | |
| CN108882450B (en) | Limiting circuit for highest output power of constant-current LED power supply and constant-current LED power supply circuit | |
| US20210273470A1 (en) | Driving circuit for switch and battery control circuit using the same | |
| JP4599146B2 (en) | Test device and power supply circuit | |
| US9268350B2 (en) | Power management apparatus with rapid short response and full load recovery | |
| CN214380047U (en) | Voltage protection circuit and Miro-LED display | |
| US20110040988A1 (en) | Single phase line switch | |
| KR102634453B1 (en) | Battery charging control system and method for vehicle | |
| CN104426367A (en) | Boost apparatus with over-current and over-voltage protection function | |
| CN107750076B (en) | LED driving circuit | |
| CN115411936A (en) | Overpower protection circuit and switching power supply | |
| CN110350765A (en) | Voltage conversion device | |
| CN117694022A (en) | Driver for delivering current to an LED load | |
| CN112904925B (en) | Load driving and protection circuit | |
| CN206947944U (en) | Printer head power supply circuit and printer | |
| CN108988629B (en) | Detection circuit, boosting device, and DC/DC converter | |
| CN111883085A (en) | Device for improving stable work of liquid crystal equipment | |
| CN216699818U (en) | Load driving circuit and display device | |
| CN211240200U (en) | Power supply control circuit | |
| CN114980422B (en) | Self-adaptive constant current control circuit | |
| CN219351528U (en) | Short-circuit protection circuit and switching power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |