CN216212266U - Display circuit board - Google Patents
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- CN216212266U CN216212266U CN202121669431.9U CN202121669431U CN216212266U CN 216212266 U CN216212266 U CN 216212266U CN 202121669431 U CN202121669431 U CN 202121669431U CN 216212266 U CN216212266 U CN 216212266U
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- 238000005070 sampling Methods 0.000 claims abstract description 66
- 238000003466 welding Methods 0.000 claims abstract description 44
- 230000002093 peripheral effect Effects 0.000 claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 2
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Abstract
The display circuit board comprises a control unit, a constant current connection unit and a constant voltage connection unit; the peripheral sampling pin of the control unit is respectively connected with the sampling end of the constant current connection unit and the sampling end of the constant voltage connection unit, and the positive output end of the control unit is used for being connected with the positive end of an external display unit; the positive end of the constant current connection unit is connected with the positive output end of the control unit, and the positive end of the constant voltage connection unit is used for connecting the negative end of the display unit; the constant current connection unit comprises a constant current welding area provided with a plurality of constant current welding points; the constant voltage connection unit includes a constant voltage welding area provided with a plurality of constant voltage welding points. The constant current connection unit and the constant voltage connection unit which are connected with the control unit and the display unit provide connection positions which can be connected with the constant current element and the constant voltage element, so that the control unit controls the display unit to be in a constant current state or a constant voltage state respectively, the complexity of a circuit structure is simplified, and the development difficulty and the production difficulty are reduced.
Description
Technical Field
The present disclosure relates to the field of circuit technology, and for example, to a display circuit board.
Background
In the prior art, in order to select the output state of a product according to the requirements of a customer, at least one complete constant voltage display circuit board and at least one complete constant current output power circuit are compatible on the same PCB, so that the customer can select one of the two functional circuits. However, providing two complete functional circuits on the same PCB board at the same time leads to problems of increased complexity and difficulty of circuit layout, and increased circuit development cost and material cost.
SUMMERY OF THE UTILITY MODEL
The purpose of the disclosure is: the display circuit board can be respectively connected with a constant current element or a constant voltage element according to actual working requirements, is simple in circuit structure and is low in development and production difficulty.
In order to achieve the purpose, the following technical scheme is adopted in the application:
provided herein is a display circuit board including a control unit and a display unit;
the device comprises a constant current connection unit and a constant voltage connection unit, wherein a peripheral sampling pin of the control unit is respectively connected with a sampling end of the constant current connection unit and a sampling end of the constant voltage connection unit, and a positive output end of the control unit is used for being connected with a positive end of an external display unit; the positive end of the constant current connection unit is connected with the positive output end of the control unit, and the positive end of the constant voltage connection unit is used for being connected with the negative end of the display unit;
the constant current connection unit comprises a constant current welding area, the constant current welding area is provided with a plurality of constant current welding points, the constant current welding points are used for welding a constant current element, and after the constant current element is welded to the constant current welding points, a constant current circuit used for providing sampling current for the control unit is formed, so that the control unit provides constant current for the display unit;
the constant voltage linkage unit includes the constant voltage weld zone, the constant voltage weld zone is provided with a plurality of constant voltage welding points, the constant voltage welding point is used for welding the constant voltage component, works as the constant voltage component welds to behind the constant voltage welding point, form be used for to the control unit provides the constant voltage circuit of sampling voltage, so that the control unit to the display element provides constant voltage.
The display circuit board provides a connecting position for connecting the constant current element and the constant voltage element through the constant current connecting unit and the constant voltage connecting unit which are connected with the control unit and the display unit, so that the constant current element is connected through the constant current connecting unit or the constant voltage element is connected through the constant voltage connecting unit according to actual requirements, the control unit controls the display unit to be in a constant current state or a constant voltage state respectively, the complexity of a circuit structure is simplified, and the development difficulty and the production difficulty are reduced.
Drawings
FIG. 1 is a schematic diagram of a display circuit board structure according to an embodiment;
FIG. 2 is a schematic diagram of a specific structure of a display circuit board according to an embodiment;
fig. 3 is a schematic structural diagram of a display circuit board according to an embodiment.
In fig. 1 to 3:
1. a control unit; 2. a constant current connection unit; 3. a constant voltage connection unit; 4. a first switch unit; 5. a second switching unit; 6. a third switching unit; 7. a fourth switching unit; r1 and a first constant current resistor; r2 and a second constant current resistor; r3 and a third constant current resistor; d1, a first diode; r4, a first constant voltage resistor; r5 and a second constant voltage resistor; r6 and a third constant voltage resistor.
The implementation, functional features and advantages of the objectives of the present application will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
As used herein, the singular forms "a", "an", "the" and "the" include plural referents unless the content clearly dictates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, modules, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, modules, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any module and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Referring to fig. 1, the schematic diagram of the structure of the display circuit board disclosed in the present disclosure includes a control unit 1, a constant current connection unit 2 and a constant voltage connection unit 3, a peripheral sampling pin of the control unit 1 is respectively connected to a sampling terminal 21 of the constant current connection unit 2 and a sampling terminal 31 of the constant voltage connection unit 3, and an anode output terminal of the control unit 1 is used for connecting an anode terminal of an external display unit; the positive terminal 22 of the constant current connection unit 2 is connected with the positive output terminal of the control unit 1, and the positive terminal 32 of the constant voltage connection unit 3 is used for connecting with the negative terminal of the display unit;
the constant current connection unit 2 comprises a constant current welding area, the constant current welding area is provided with a plurality of constant current welding points, the constant current welding points are used for welding a constant current element, and after the constant current element is welded to the constant current welding points, a constant current circuit used for providing sampling current for the control unit 1 is formed, so that the control unit 1 provides constant current for the display unit;
the constant voltage connection unit 3 includes a constant voltage welding area provided with a plurality of constant voltage welding points for welding a constant voltage element, and after the constant voltage element is welded to the constant voltage welding points, a constant voltage circuit for supplying a sampling voltage to the control unit 1 is formed so that the control unit 1 supplies a constant voltage to the display unit.
In one embodiment, the control unit 1 comprises a control circuit and a main power circuit based on a constant current chip, and is used for inputting constant current or constant voltage to the display unit; the peripheral sampling pin of the control unit 1 is a constant voltage output end and is used for collecting the sampling current value of the sampling end 21 of the constant current connection unit 2 or the sampling voltage value of the sampling end 31 of the constant voltage connection unit 3.
In an embodiment, the external display unit may include a plurality of LED lamps connected in series, a plurality of LED light bars connected in parallel, or other electronic components capable of displaying and requiring a constant current or a constant voltage, which is not described herein again.
In an embodiment, when the display unit needs to work under a constant current state in an actual application scene, the constant voltage connection unit 3 is not loaded during production, and only the corresponding constant current elements are connected at each welding point of the constant current connection unit 2, so that a constant current circuit is formed in the welded constant current connection unit 2, and the constant current circuit is used for providing sampling current for the control unit 1, so that the control unit 1 provides constant current for the display unit according to the sampling current, and the working current of the display unit is constant, at the moment, the voltage of the display unit can change within a certain range along with the difference of the load resistance value in the display unit, when the load resistance value is smaller, the voltage of the display unit is lower, and when the load resistance value is larger, the voltage of the display unit is higher, the impact of overcurrent on each element of the display unit is avoided, and the service life of the display unit is prolonged.
In an embodiment, when the display unit needs to work in a constant voltage state in an actual application scene, the constant current connection unit 2 is not loaded during production, and only corresponding constant voltage elements are connected at each welding point of the constant voltage connection unit 3, so that a constant voltage circuit is formed in the welded constant voltage connection unit 3, the constant voltage circuit is used for providing sampling voltage for the control unit 1, so that the control unit 1 provides constant voltage for the display unit according to the sampling voltage, the working voltage is constant, the current flowing through the display unit can change within a certain range along with the difference of the load resistance value, when the load resistance value is smaller, the current flowing through the display unit is larger, and when the load resistance value is larger, the current flowing through the display unit is smaller, the display unit is suitable for the display unit with larger load, and the influence of the load open circuit fault is lower.
In one embodiment, in the constant current connection unit 2 and the constant voltage connection unit 3, a corresponding gap is reserved between each welding point so as to place a constant current element or a constant voltage element.
In conclusion, the constant current connection unit 2 and the constant voltage connection unit 3 which are connected with the control unit 1 and the display unit provide connection positions which can be connected with the constant current element and the constant voltage element, so that the constant current element is connected through the constant current connection unit 2 or the constant voltage element is connected through the constant voltage connection unit 3 according to actual requirements, the display unit formed on the basis of the display circuit board disclosed by the utility model can respectively meet the effect of constant current or constant voltage, the complexity of the circuit structure is simplified, and the development difficulty and the production difficulty are reduced.
Further, referring to fig. 2, which is a schematic diagram of a specific structure of the display circuit board disclosed in the present disclosure, the constant current element includes a first constant current resistor R1, a second constant current resistor R2, a third constant current resistor R3, and a first diode D1;
when the first constant current resistor R1, the second constant current resistor R2, the third constant current resistor R3 and the first diode D1 are welded to a constant current welding point, a constant current circuit is formed;
in the constant current circuit, a first constant current resistor R1 is used for being connected in series between a peripheral sampling pin and a negative electrode end of a display unit; one end of the second constant current resistor R2 is connected to a lead between the first constant current resistor R1 and the peripheral sampling pin, and the other end of the second constant current resistor R2 is grounded; one end of the third constant current resistor R3 is connected to the lead between the first constant current resistor R1 and the negative terminal of the display unit, and the other end is grounded to the second constant current resistor R2; the positive terminal of the first diode D1 is connected to a lead between the first constant current resistor R1 and the negative terminal of the display unit, and the negative terminal is connected to the common ground of the second constant current resistor R2.
In one embodiment, one end of the first constant current resistor R1 connected to the peripheral sampling pin serves as the sampling terminal 21 of the constant current connection unit 2, and one end of the first constant current resistor R1 connected to the negative terminal of the display unit serves as the positive terminal 22 of the constant current connection unit 2.
In one embodiment, the first diode D1 is arranged to fix the current direction in the constant current circuit, so as to avoid interference from other electronic components and improve the accuracy of the sampling current collected by the peripheral sampling pin.
Further, referring to fig. 2, the constant voltage element includes a first constant voltage resistor R4, a second constant voltage resistor R5, and a third constant voltage resistor R6;
wherein, after the first constant voltage resistor R4, the second constant voltage resistor R5 and the third constant voltage resistor R6 are welded on a constant voltage welding point, a constant voltage circuit is formed;
in the constant voltage circuit, a first constant voltage resistor R4 is used to be connected in series between the positive output terminal of the control unit 1 and one end of a second constant voltage resistor R5, the other end of the second constant voltage resistor R5 is connected to one end of a third constant voltage resistor R6, and the other end of the third constant voltage resistor R6 is grounded; the peripheral sampling pin is connected to a lead between the second constant voltage resistor R5 and the third constant voltage resistor R6.
In one embodiment, one end of the first constant current resistor R4 connected to the positive output terminal of the control unit 1 serves as the sampling terminal 31 of the constant voltage connection unit 3, and one end of the first constant current resistor R1 connected to the peripheral sampling pin serves as the positive terminal 32 of the constant voltage connection unit 3.
In one embodiment, the resistances of the first, second, and third constant voltage resistors R4, R5, and R6 may be set according to a desired constant voltage. Specifically, the relationship of the resistance value of each resistance in the constant voltage circuit to the sampling voltage can be calculated according to the following equation:
Vo＝(RB4+RB5+RB6)/RB6*V1
in the formula, Vo is a sampling voltage value, RB4, RB5, and RB6 are resistance values of the first constant voltage resistor R4, the second constant voltage resistor R5, and the third constant voltage resistor R6, respectively, and V1 is a voltage value output by a peripheral sampling pin of the control unit 21. Specifically, the voltage value of the constant voltage input to the display unit by the control unit 1 is generally an integral multiple of Vo.
Specifically, when the first constant voltage resistor R4, the second constant voltage resistor R5 and the third constant voltage resistor R6 are welded into each welding point of the constant voltage connection unit 3, the first constant voltage resistor R4, the second constant voltage resistor R5 and the first diode D1 are not connected, and the third constant voltage resistor R6 selects a 0-ohm resistor or short-circuits the resistor, so that the sampling voltage acquired by the peripheral sampling pin is fed back to the control unit, and the effect that the control unit controls the positive terminal of the display unit to input the constant voltage is realized.
Specifically, when the first constant voltage resistor R4, the second constant voltage resistor R5 and the third constant voltage resistor R6 are not loaded, the first constant voltage resistor R4, the second constant voltage resistor R5 and the first diode D1 are welded to respective welding points of the constant current connection unit 2, and the third constant voltage resistor R6 is adjusted to an appropriate resistance value, so that the control unit can collect the sampling current conveniently.
Specifically, if the resistance of the third constant voltage resistor R6 is made to be a small value, for example, the resistance of the third constant voltage resistor R6 is less than 0.5 Ω, the third constant voltage resistor R6 can be left on top when the first, second, and third constant voltage resistors R4, R5, and R6 are welded into the constant voltage connection unit 3, thereby simplifying the welding process and avoiding the need to repeatedly remove or weld the third constant voltage resistor R6.
Further, referring to fig. 3, the display circuit board disclosed in the present embodiment is a schematic diagram of a specific structure, and further includes a first switch unit 4 and a second switch unit 5;
the first switch unit 4 is connected between the negative terminal of the display unit and the positive terminal 22 of the constant current connection unit 2;
the second switching unit 5 is connected between the peripheral sampling pin and the sampling terminal 21 of the constant current connection unit 2.
In one embodiment, the first switch unit 4 and the second switch unit 5 are used for controlling whether the constant current element is connected to a circuit on the display circuit board or not, so that the switching of the constant current state is realized, and the switching efficiency of the constant current state is improved.
Further, referring to fig. 3, a third switching unit 6 and a fourth switching unit 7 are further included;
the third switching unit 6 is connected between the positive output terminal of the control unit 1 and the positive terminal 32 of the constant voltage connection unit 3;
the fourth switching unit 7 is connected between the peripheral sampling pin and the sampling terminal 31 of the constant voltage connection unit 3.
In one embodiment, whether the constant voltage element is connected to the display circuit board is controlled by the third switching unit 6 and the fourth switching unit 7, so that the switching of the constant voltage state is realized, and the switching efficiency of the constant voltage state is improved.
Further, the first constant current resistor R1, the second constant current resistor R2 and the third constant current resistor R3 are adjustable resistors respectively.
In an embodiment, the first constant current resistor R1, the second constant current resistor R2 and the third constant current resistor R3 are set as adjustable resistors, and the value of the current flowing through the first diode D1 can be changed by adjusting the resistance values of the first constant current resistor R1, the second constant current resistor R2 and the third constant current resistor R3, so that the adjustment of the sampling current is realized, the control unit can output different constant current according to the sampling current, the universality of the display circuit board is improved, and the display circuit board is suitable for scenes with different constant current requirements.
In one embodiment, except for the case of controlling the first switch unit 4 and the second switch unit 5, when the constant voltage state is required, the first constant current resistor R1 and the second constant current resistor R2 are adjusted to the maximum value, that is, an effect of approximately breaking is formed, and the third constant current resistor R3 is adjusted to the minimum value, that is, an effect of approximately short-circuiting is formed, so that voltage division is avoided, and the influence on the sampling voltage is reduced.
Further, the first constant voltage resistor R4, the second constant voltage resistor R5, and the third constant voltage resistor R6 are adjustable resistors, respectively.
In one embodiment, the first constant voltage resistor R4, the second constant voltage resistor R5 and the third constant voltage resistor R6 are set as adjustable resistors, and the current value flowing through each constant voltage resistor can be changed by adjusting the resistance values of the first constant voltage resistor R4, the second constant voltage resistor R5 and the third constant voltage resistor R6, so that the sampling voltage can be adjusted, the control unit can output different constant voltage voltages according to the sampling voltage, the universality of the display circuit board is improved, and the display circuit board is suitable for scenes with different constant voltage requirements.
In one embodiment, except for the case of controlling the third switching unit 6 and the fourth switching unit 7, when the constant current state is required, the first constant voltage resistor R4, the second constant voltage resistor R5, and the third constant voltage resistor R6 are adjusted to the maximum value, i.e., an approximately open circuit effect is formed, thereby greatly reducing the influence of the sampling voltage on the constant voltage circuit.
Further, the first switching unit 4 and the second switching unit 5 are relays for turning on or off according to a control signal, respectively.
In one embodiment, the switch unit is set as a relay for switching on or off according to the control signal, so that a user can send a switching signal to the relay driving control circuit through a remote controller, a key and the like according to the requirement of the user, so that the relay is switched off or on according to the control signal of the relay driving control circuit, and the constant current state switching is performed.
Further, the third switching unit 6 and the fourth switching unit 7 are relays for turning on or off according to a control signal, respectively.
In one embodiment, the switch unit is set as a relay for switching on or off according to the control signal, so that a user can send a switching signal to the relay driving control circuit through a remote controller, a key and the like according to the requirement of the user, so that the relay is switched off or on according to the control signal of the relay driving control circuit, and the relay is switched in a constant voltage state.
Further, the control unit 1 includes a BD94121 chip.
In one embodiment, pin 6 of the BD94121 chip is a second output terminal of the control unit 1; since the 6 th pin of the BD94121 chip is a peripheral sampling pin, the voltage thereof is constant at 0.5V, the relationship between the resistance value and the constant voltage can be calculated according to the following formula:
Vo＝(RB4+RB5+RB6)/RB6*0.5
in the formula, Vo is a constant voltage value, and RB4, RB5, and RB6 are resistance values of the first constant voltage resistor R4, the second constant voltage resistor R5, and the third constant voltage resistor R6, respectively.
To sum up, for the display circuit board provided in the embodiment of the present application, a connection position capable of connecting the constant current element and the constant voltage element is provided through the constant current connection unit 2 and the constant voltage connection unit 3 connected to the control unit 1 and the display unit, so that the constant current element is connected through the constant current connection unit 2 or the constant voltage element is connected through the constant voltage connection unit 3 according to actual requirements, and thus the control unit 1 controls the display unit to be in a constant current state or a constant voltage state respectively, the complexity of the circuit structure is simplified, and the development difficulty and the production difficulty are reduced; the first constant current resistor R1, the second constant current resistor R2, the third constant current resistor R3 and the first diode D1 form a constant current circuit, so that accurate sampling current is provided for the control unit 1, the control unit 1 can output constant current to the display unit, and the display unit works in a constant current state, and the service life of the display unit is prolonged; the first constant voltage resistor R4, the second constant voltage resistor R5 and the third constant voltage resistor R6 form a constant voltage circuit, accurate sampling voltage is provided for the control unit 1, the control unit 1 can output constant voltage to the display unit, the display unit works in a constant voltage state, and the constant voltage circuit is suitable for the display unit with a large load, so that the display unit is less affected by a load open-circuit fault; whether the constant current element is connected into the circuit or not is controlled by the first switch unit 4 and the second switch unit 5, so that the switching of the constant current state is realized, and the switching efficiency of the constant current state is improved; whether the constant voltage element is connected into the circuit or not is controlled through the third switching unit 6 and the fourth switching unit 7, so that the switching of the constant voltage state is realized, and the switching efficiency of the constant voltage state is improved; the first constant current resistor R1, the second constant current resistor R2 and the third constant current resistor R3 are set as adjustable resistors, so that the magnitude of sampling current is changed, the control unit 1 can output constant current with different magnitudes according to the sampling current with different magnitudes to realize the adjustment of the constant current, the universality of the display circuit board is improved, and the display circuit board is suitable for scenes with different constant current requirements; the first constant voltage resistor R4, the second constant voltage resistor R5 and the third constant voltage resistor R6 are set as adjustable resistors, so that the size of the sampling voltage is changed, the control unit 1 can output constant voltage with different sizes according to the sampling voltage with different sizes, the adjustment of the constant voltage can be realized, the universality of the display circuit board is improved, and the display circuit board is suitable for scenes with different constant voltage requirements; the switching unit is set to be a relay which is used for being switched on or switched off according to the control signal, so that a user can send a switching signal to the relay driving control circuit through a remote controller, a key and the like according to the requirement of the user, the relay is switched off or switched on according to the control signal of the relay driving control circuit, and the relay is switched to be in a constant current state or a constant voltage state.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A display circuit board comprises a control unit;
the device is characterized by further comprising a constant current connection unit and a constant voltage connection unit, wherein peripheral sampling pins of the control unit are respectively connected with a sampling end of the constant current connection unit and a sampling end of the constant voltage connection unit, and a positive output end of the control unit is used for being connected with a positive end of an external display unit; the positive end of the constant current connection unit is connected with the positive output end of the control unit, and the positive end of the constant voltage connection unit is used for being connected with the negative end of the display unit;
the constant current connection unit comprises a constant current welding area, the constant current welding area is provided with a plurality of constant current welding points, the constant current welding points are used for welding a constant current element, and after the constant current element is welded to the constant current welding points, a constant current circuit used for providing sampling current for the control unit is formed, so that the control unit provides constant current for the display unit;
the constant voltage linkage unit includes the constant voltage weld zone, the constant voltage weld zone is provided with a plurality of constant voltage welding points, the constant voltage welding point is used for welding the constant voltage component, works as the constant voltage component welds to behind the constant voltage welding point, form be used for to the control unit provides the constant voltage circuit of sampling voltage, so that the control unit to the display element provides constant voltage.
2. The display circuit board according to claim 1, wherein the constant current element includes a first constant current resistor, a second constant current resistor, a third constant current resistor, and a first diode;
the first constant current resistor, the second constant current resistor, the third constant current resistor and the first diode are welded on the constant current welding point to form the constant current circuit;
in the constant current circuit, the first constant current resistor is used for being connected in series between the peripheral sampling pin and the negative electrode end of the display unit; one end of the second constant current resistor is connected to a lead between the first constant current resistor and the peripheral sampling pin, and the other end of the second constant current resistor is grounded; one end of the third constant current resistor is connected to a lead between the first constant current resistor and the cathode end of the display unit, and the other end of the third constant current resistor is grounded with the second constant current resistor; and the positive end of the first diode is connected to a lead between the first constant current resistor and the negative end of the display unit, and the negative end of the first diode is grounded with the second constant current resistor.
3. The display circuit board of any one of claims 1-2, wherein the constant voltage element includes a first constant voltage resistance, a second constant voltage resistance, and a third constant voltage resistance;
the constant voltage circuit is formed after the first constant voltage resistor, the second constant voltage resistor and the third constant voltage resistor are welded on the constant voltage welding point;
in the constant voltage circuit, the first constant voltage resistor is used for being connected in series between the positive output end of the control unit and one end of the second constant voltage resistor, the other end of the second constant voltage resistor is connected to one end of the third constant voltage resistor, and the other end of the third constant voltage resistor is grounded; and the peripheral sampling pin is connected to a lead between the second constant voltage resistor and the third constant voltage resistor.
4. The display circuit board of claim 1, further comprising a first switch unit and a second switch unit;
the first switch unit is connected between the negative end of the display unit and the positive end of the constant current connection unit;
the second switch unit is connected between the peripheral sampling pin and the sampling end of the constant current connection unit.
5. The display circuit board of claim 1, further comprising a third switching unit and a fourth switching unit;
the third switch unit is connected between the positive output end of the control unit and the positive end of the constant voltage connection unit;
and the fourth switching unit is connected between the peripheral sampling pin and the sampling end of the constant voltage connection unit.
6. The display circuit board according to claim 2, wherein the first constant current resistor, the second constant current resistor, and the third constant current resistor are each an adjustable resistor.
7. The display circuit board of claim 3, wherein the first, second and third constant voltage resistors are adjustable resistors, respectively.
8. The display circuit board of claim 4, wherein the first and second switching units are relays for turning on or off according to a control signal, respectively.
9. The display circuit board of claim 5, wherein the third and fourth switching units are relays for being turned on or off according to a control signal, respectively.
10. The display circuit board of claim 1, wherein the control unit comprises a BD94121 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121669431.9U CN216212266U (en) | 2021-07-21 | 2021-07-21 | Display circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121669431.9U CN216212266U (en) | 2021-07-21 | 2021-07-21 | Display circuit board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216212266U true CN216212266U (en) | 2022-04-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121669431.9U Active CN216212266U (en) | 2021-07-21 | 2021-07-21 | Display circuit board |
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| Country | Link |
|---|---|
| CN (1) | CN216212266U (en) |
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2021
- 2021-07-21 CN CN202121669431.9U patent/CN216212266U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |