CN209373081U - A kind of LED device tester - Google Patents
A kind of LED device tester Download PDFInfo
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- CN209373081U CN209373081U CN201822202448.8U CN201822202448U CN209373081U CN 209373081 U CN209373081 U CN 209373081U CN 201822202448 U CN201822202448 U CN 201822202448U CN 209373081 U CN209373081 U CN 209373081U
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- led device
- photoelectrical coupler
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Abstract
The utility model discloses a kind of LED device testers, including tester ontology, tester ontology is equipped with power switch, attaching plug, display screen, first output port and second output terminal mouth, power switch, attaching plug, display screen, first output port and second output terminal mouth are connect with the control panel being provided at its inner portion, control panel includes rectification circuit, DC/DC step-up/step-down circuit, controller, micro-current control circuit and constant-current drive circuit, external ac power source is connected with the rectifying circuit after passing sequentially through attaching plug and power switch, rectification circuit is connect with DC/DC step-up/step-down circuit, DC/DC step-up/step-down circuit is connect with controller and micro-current control circuit, controller is also connect with display screen and constant-current drive circuit respectively, constant-current drive circuit is also connect with the first output port, second output Port is connect with controller and micro-current control circuit respectively；Its effect is: the driving voltage of LED device is shown by the display screen being equipped with, consequently facilitating carrying out voltage matches to it.
Description
Technical field
The utility model relates to electric circuit electronics technical technical fields, and in particular to a kind of LED device tester.
Background technique
LED device is widely used in daily life, drives LED device by the driving plate of LED device, sets in LED
When for breaking down, needing to detect, repair, needs accurately to know the driving voltage of its driving plate, therefore, how to know driving
The problem of driving voltage of plate is urgent need to resolve.
Summary of the invention
The purpose of the utility model is to provide a kind of LED device testers of driving voltage that can know driving plate.
The technical solution that the utility model is taken are as follows: a kind of LED device tester, including tester ontology, the test
Instrument ontology be equipped with power switch, attaching plug, display screen, the first output port and second output terminal mouth, the power switch,
Attaching plug, display screen, the first output port and second output terminal mouth are connect with the control panel that tester body interior is arranged in,
The control panel includes rectification circuit, DC/DC step-up/step-down circuit, controller, micro-current control circuit and constant-current drive circuit, outside
Portion's AC power source is connect after passing sequentially through the attaching plug and power switch with the rectification circuit, the rectification circuit also with
The DC/DC step-up/step-down circuit connection, the DC/DC step-up/step-down circuit connect with the controller and micro-current control circuit respectively
It connects, the controller is also connect with the display screen and constant-current drive circuit respectively, and the constant-current drive circuit is also with described
The connection of one output port, the second output terminal mouth are connect with the controller and micro-current control circuit respectively.
Preferably, the DC/DC step-up/step-down circuit includes transformer T1 and Switching Power Supply driving chip, the transformer T1
One end of primary side is connect with the output end of the rectification circuit, and the other end of the transformer T1 primary side and the Switching Power Supply are driven
Dynamic chip connection, the secondary side of the transformer T1 include reduced output voltage end and boosting output end, the reduced output voltage end with it is described
Controller connection, the boosting output end are connect with the micro-current control circuit.
Preferably, a voltage stabilizing chip is additionally provided between the reduced output voltage end and the controller.
Preferably, the micro-current control circuit includes that the first photoelectrical coupler, TL431 and metal-oxide-semiconductor Q1, the boosting are defeated
Outlet is connect with the anode of the first photoelectrical coupler, and the cathode of first photoelectrical coupler and the cathode of TL431 connect,
The reference pole of the plus earth of TL431, TL431 is connect by metal-oxide-semiconductor Q1 with the second output terminal mouth, the first photoelectricity coupling
The collector and emitter of clutch is connect with the Switching Power Supply driving chip respectively.
Preferably, the second output terminal mouth is connect by adjustable resistance VR1 with the controller.
Preferably, the constant-current drive circuit includes the second photoelectrical coupler, constant current chip, metal-oxide-semiconductor Q2 and inductance L1, institute
The anode for stating the second photoelectrical coupler is connect with the controller, the minus earth of the second photoelectrical coupler, the second photoelectric coupling
The collector of device is connect with power supply VCC, and the collector of the second photoelectrical coupler is also connect with the constant current chip, the constant current core
Piece is connect connect with the inductance L1 again after with first output port, leakage of the constant current chip also with the metal-oxide-semiconductor Q2
Pole connection, the source electrode ground connection of metal-oxide-semiconductor Q2, the grid of metal-oxide-semiconductor Q2 are connect with the emitter of second photoelectrical coupler.
Preferably, the display screen uses charactron.
By adopting the above technical scheme, have the advantage that the utility model proposes a kind of LED device tester, work
When, the both ends of LED device are connect with the first output port and second output terminal mouth being equipped with, are gradually being lighted in LED device
While lamp bead, the driving voltage of this LED device is shown by the display screen being equipped with, thus know the driving voltage of driving plate,
Avoid damage caused by mismatching because of voltage equipment when replacing the driving plate of former LED device.
Detailed description of the invention
Fig. 1 is the functional block diagram of the utility model embodiment；
Fig. 2 is the circuit diagram I in the utility model embodiment；
Fig. 3 is the circuit diagram II in the utility model embodiment；
Fig. 4 is the circuit diagram III in the utility model embodiment；
Fig. 5 is the structural schematic diagram of controller in the utility model embodiment；
Fig. 6 is the structural schematic diagram of display screen in the utility model embodiment.
Specific embodiment
In order to keep the technical problems to be solved in the utility model, technical solution and advantage clearer, below in conjunction with attached
Figure and specific embodiment are described in detail, and the following examples illustrate the utility model, but it is practical new to be not limited to this
The range of type.
Referring to figs. 1 to shown in Fig. 6, scheme disclosed in the utility model embodiment: a kind of LED device tester, including
Tester ontology, it is defeated that the tester ontology is equipped with power switch, attaching plug, display screen, the first output port and second
Exit port, the power switch, attaching plug, display screen, the first output port and second output terminal mouth and setting are in tester
The control panel of body interior connects, and the control panel includes rectification circuit, DC/DC step-up/step-down circuit, controller, micro-current control
Circuit and constant-current drive circuit, external ac power source pass sequentially through after the attaching plug and power switch with the rectification circuit
Connection, the rectification circuit also connect with the DC/DC step-up/step-down circuit, the DC/DC step-up/step-down circuit respectively with the control
Device processed is connected with micro-current control circuit, and the controller is also connect with the display screen and constant-current drive circuit respectively, described
Constant-current drive circuit is also connect with first output port, the second output terminal mouth respectively with the controller and micro-current
Control circuit connection.
Specifically, microcontroller can be used in controller, and tester ontology is integrally in rectangular parallelepiped structure, and display screen is using digital
Pipe or liquid crystal display, in application, attaching plug to be connected after alternating current to the power switch opened on tester ontology, by LED
The both ends of equipment are connect with the first output port and second output terminal mouth being equipped with, and are gradually lighting the same of lamp bead in LED device
When, the second output terminal mouth is connect by adjustable resistance VR1 with the controller, and controller is made to obtain corresponding feedback letter
Number, it is indicated in figure with ADV, the driving voltage of this LED device is then shown by the display screen being equipped with, to know driving plate
Driving voltage, avoid damage caused by mismatching because of voltage equipment when replacing the driving plate of former LED device.It needs
Bright, the first output port, that is, LED device negative terminal here is indicated in Fig. 3, Fig. 4 with OUT-LED-, second output terminal
Mouth is the anode of LED device, is indicated in Fig. 3 with OUT-LED+.
Further, in order to meet the input voltage of distinct device, the DC/DC step-up/step-down circuit include transformer T1 and
Switching Power Supply driving chip, one end of the transformer T1 primary side are connect with the output end of the rectification circuit, the transformer
The other end of T1 primary side is connect with the Switching Power Supply driving chip, and the secondary side of the transformer T1 includes reduced output voltage end and liter
Output end is pressed, the reduced output voltage end is connect with the controller, and the boosting output end and the micro-current control circuit connect
It connects.
Specifically, it is additionally provided with a voltage stabilizing chip between the reduced output voltage end and the controller, which is used for
The supply voltage of 3.3V is provided to controller, the micro-current control circuit includes the first photoelectrical coupler, TL431 and metal-oxide-semiconductor
Q1, the boosting output end are connect with the anode of the first photoelectrical coupler, the cathode of first photoelectrical coupler and TL431's
The reference pole of cathode connection, the plus earth of TL431, TL431 is connect by metal-oxide-semiconductor Q1 with the second output terminal mouth, described
The collector and emitter of first photoelectrical coupler is connect with the Switching Power Supply driving chip respectively, is connected, can be led in this way
The input signal for crossing metal-oxide-semiconductor Q1 controls the signal output of preceding pole transformer T1 primary side upper switch power drives chip.Wherein,
TL431 is a kind of parallel voltage-stabilizing integrated circuit.Because its performance is good, price is low, therefore it is widely used in various power circuits.
Further, as shown in figure 4, the constant-current drive circuit includes the second photoelectrical coupler, constant current chip, metal-oxide-semiconductor
Q2 and inductance L1, the anode of second photoelectrical coupler are connect with the controller, the minus earth of the second photoelectrical coupler,
The collector of second photoelectrical coupler is connect with power supply VCC, and the collector of the second photoelectrical coupler also connects with the constant current chip
Connect, the constant current chip is connect connect with the inductance L1 again after with first output port, the constant current chip also with institute
State the drain electrode connection of metal-oxide-semiconductor Q2, the source electrode ground connection of metal-oxide-semiconductor Q2, the transmitting of the grid of metal-oxide-semiconductor Q2 and second photoelectrical coupler
Pole connection.The output current controling signal of controller is indicated with KT on the diagram, other specific connection relationships as shown,
Since circuit is too big, so Fig. 2 to Fig. 4 is provided separately, for the ease of seeing that figure, Fig. 2 and Fig. 3 have identical part CE1, Fig. 3
There is identical part L1 and OUT-LED- with Fig. 4, is used as sees figure reference in this way.
Fig. 5 is the structure chart of controller, and Fig. 6 is the structural schematic diagram of display screen, and the connection relationship of specific pin is as schemed
It is shown, it will not repeat them here.
Through the above scheme, the driving voltage of LED device can be very easily measured, and then in the drive of replacement LED device
It can accomplish voltage matches when movable plate, meanwhile, structure is simple, easy to use.
Finally, it should be noted that foregoing description is only specific embodiment of the present utility model, but the utility model
Protection scope is not limited thereto, the technical scope that anyone skilled in the art discloses in the utility model
Interior, any changes or substitutions that can be easily thought of, should be covered within the scope of the utility model.
Claims (7)
1. a kind of LED device tester, including tester ontology, the tester ontology be equipped with power switch, attaching plug,
Display screen, the first output port and second output terminal mouth, which is characterized in that the power switch, attaching plug, display screen,
One output port and second output terminal mouth are connect with the control panel that tester body interior is arranged in, and the control panel includes rectification
Circuit, DC/DC step-up/step-down circuit, controller, micro-current control circuit and constant-current drive circuit, external ac power source pass sequentially through
It is connect after the attaching plug and power switch with the rectification circuit, the rectification circuit also goes up and down piezoelectricity with the DC/DC
Road connection, the DC/DC step-up/step-down circuit are connect with the controller and micro-current control circuit respectively, and the controller also divides
It is not connect with the display screen and constant-current drive circuit, the constant-current drive circuit is also connect with first output port, institute
Second output terminal mouth is stated to connect with the controller and micro-current control circuit respectively.
2. a kind of LED device tester according to claim 1, which is characterized in that the DC/DC step-up/step-down circuit includes
Transformer T1 and Switching Power Supply driving chip, one end of the transformer T1 primary side are connect with the output end of the rectification circuit,
The other end of the transformer T1 primary side is connect with the Switching Power Supply driving chip, and the secondary side of the transformer T1 includes decompression
Output end and boosting output end, the reduced output voltage end are connect with the controller, the boosting output end and the micro-current
Control circuit connection.
3. a kind of LED device tester according to claim 2, which is characterized in that the reduced output voltage end and the control
A voltage stabilizing chip is additionally provided between device processed.
4. a kind of LED device tester according to claim 2, which is characterized in that the micro-current control circuit includes
First photoelectrical coupler, TL431 and metal-oxide-semiconductor Q1, the boosting output end are connect with the anode of the first photoelectrical coupler, and described
The cathode of one photoelectrical coupler and the cathode of TL431 connect, and the reference pole of the plus earth of TL431, TL431 passes through metal-oxide-semiconductor Q1
Connect with the second output terminal mouth, the collector and emitter of first photoelectrical coupler respectively with the Switching Power Supply
Driving chip connection.
5. a kind of LED device tester according to claim 1, which is characterized in that the second output terminal mouth passes through can
Resistance VR1 is adjusted to connect with the controller.
6. a kind of LED device tester according to claim 1, which is characterized in that the constant-current drive circuit includes the
Two photoelectrical couplers, constant current chip, metal-oxide-semiconductor Q2 and inductance L1, the anode and the controller of second photoelectrical coupler connect
It connects, the minus earth of the second photoelectrical coupler, the collector of the second photoelectrical coupler is connect with power supply VCC, the second photoelectric coupling
The collector of device is also connect with the constant current chip, and the constant current chip exports connect with the inductance L1 again after with described first
Port connection, the constant current chip are also connect with the drain electrode of the metal-oxide-semiconductor Q2, the source electrode ground connection of metal-oxide-semiconductor Q2, the grid of metal-oxide-semiconductor Q2
Pole is connect with the emitter of second photoelectrical coupler.
7. a kind of LED device tester according to claim 1, which is characterized in that the display screen uses charactron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822202448.8U CN209373081U (en) | 2018-12-26 | 2018-12-26 | A kind of LED device tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822202448.8U CN209373081U (en) | 2018-12-26 | 2018-12-26 | A kind of LED device tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209373081U true CN209373081U (en) | 2019-09-10 |
Family
ID=67831101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822202448.8U Active CN209373081U (en) | 2018-12-26 | 2018-12-26 | A kind of LED device tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209373081U (en) |
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2018
- 2018-12-26 CN CN201822202448.8U patent/CN209373081U/en active Active
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