Portable SMD LED lamp bead test pen

Abstract

The utility model provides a portable SMD LED lamp bead test pen, comprising a battery, and a charge and discharge protection circuit, a boost circuit, and a constant current output current switching circuit which are connected in sequence, the constant current output current switching circuit comprises input ends IN + and IN-and output ends OUT + and OUT-, one end of the input end IN + is connected with a change-over switch, and the other end of the input end IN + is connected with the boost circuit. One end of the output end OUT + is connected with the constant current module, and the change-over switch is connected with the constant current module. The portable SMD LED lamp bead test pen adopted by the utility model is small and light in appearance, convenient to carry, free from setting parameters, simple to operate, and capable of reducing the dependency on the skill level of production staff, meeting the lightening test of single-core and multi-core LED lamp beads and improving the working efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of LED lamps, in particular to a portable patch LED lamp bead test pen. Background Art

[0002] Before patching the LED lamp board, it is necessary to identify the polarity of the LED lamp beads. However, the positive and negative pad shapes on the back of some LED lamp beads are very small and symmetric structures, and it cannot be judged only from the appearance. Tools are needed to light up the LED lamp beads for identification.

[0003] Previously, the commonly used lamp beads were basically single-chip lamp beads with a VF value of about 3V, and a common multimeter was used for lighting judgment. However, as the market's requirement for the light efficiency of LED lamps is getting higher and higher, single-chip LED lamp beads are difficult to meet the demand. Therefore, multi-chip LED lamp beads have emerged on the market, such as 3030 dual-core, 3030 four-core, 5050 eight-core, 5050 ten-chip lamp beads, etc. If these multi-chip lamp beads are still lit with a multimeter, there are limitations, because the output voltage of the common multimeter is low and can only light up single-core or dual-core series-connected LED lamp beads. To light up LED lamp beads with more than two cores, a bulky DC power supply is required, which is very inconvenient and affects work efficiency. Summary of the Utility Model

[0004] To solve the above problems, the utility model provides a portable patch LED lamp bead test pen, which can light up and test both single-core and multi-core LED lamp beads, is not restricted by the working environment, is convenient to operate, and compared with using a DC power supply or a multimeter, not only improves work efficiency but also reduces the cost of detection tools.

[0005] The technical solution of the utility model is as follows: A portable patch LED lamp bead test pen, which includes a battery and a charge-discharge protection circuit, a boost circuit, and a constant current output current switching circuit connected in sequence. The constant current output current switching circuit includes input terminals IN+ and IN- and output terminals OUT+ and OUT-. One end of the input terminal IN+ is connected to a switching switch, one end of the output terminal OUT+ is connected to a constant current module, and the switching switch is connected to the constant current module.

[0006] Further, the constant current module includes a constant current diode or a current limiting resistor. One end of the constant current diode or the current limiting resistor is connected to the switching switch, and the other end of the constant current diode or the current limiting resistor is connected to the output terminal OUT+.

[0007] Further, the constant current module includes two or more constant current diodes with different constant current values. One ends of the constant current diodes with different constant current values are respectively connected to the output terminal OUT+, and the switching switch can selectively connect one end of the constant current diodes with different constant current values.

[0008] Further, the constant current module includes more than two current-limiting resistors with different resistance values. One ends of the current-limiting resistors with different resistance values are respectively connected to the output terminal OUT+, and the switching switch can selectively connect to one of the other ends of the current-limiting resistors with different resistance values.

[0009] Further, the test pen further includes two test probes with adjustable spacing, and an elastic member is provided between the test probes.

[0010] Further, the test pen further includes an adjustment button protruding from the surface of the pen barrel, and the adjustment button adjusts the elastic member.

[0011] Further, the test pen further includes a charging port, and the charging port is connected to the charge and discharge protection circuit.

[0012] Further, the charging port is a Micro USB interface or a USB Type C interface.

[0013] Further, the battery is a polymer lithium battery.

[0014] Compared with the prior art, the portable patch LED lamp bead test pen adopted by the present utility model is small, light and convenient to carry. It does not need to set parameters, has simple operation, reduces the dependence on the skill level of production employees, and at the same time meets the lighting tests of single-core and multi-core LED lamp beads, improving work efficiency. Description of the Drawings

[0015] Figure 1 It is the working circuit framework diagram of the test pen in Embodiment 1 and Embodiment 2 of the present utility model.

[0016] Figure 2 It is the constant current output current switching circuit diagram in Embodiment 1 of the present utility model.

[0017] Figure 3 It is the constant current output current switching circuit diagram in Embodiment 2 of the present utility model.

[0018] Figure 4 It is the internal structure schematic diagram of the test pen in Embodiment 1 and Embodiment 2 of the present utility model.

[0019] Figure 5 It is the external structure schematic diagram of the test pen in Embodiment 1 and Embodiment 2 of the present utility model.

[0020] Reference Signs: 1-Type C charging port, 2-lithium battery, 3-charge and discharge circuit protection board, 4-booster circuit board, 51-constant current output current switching circuit board, 52-constant current switching switch, 6-adjustment button, 7-test probe, 8-spring, 9-switch. Detailed Embodiments

[0021] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments. The following description is merely exemplary and does not limit the protection scope of the present utility model.

[0022] It should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0023] Please refer to Figure 1 - Figure 2 and Figure 4 - Figure 5 , Embodiment 1 of the present utility model, a portable patch LED lamp bead test pen, which includes a lithium battery 2 and a charge-discharge protection circuit, a boost circuit, and a constant current output current switching circuit connected in sequence. The constant current output current switching circuit includes an input terminal IN+ and IN-, and an output terminal OUT+ and OUT-. One end of the input terminal IN+ is connected to a switching switch, one end of the output terminal OUT+ is connected to a constant current module, the switching switch is connected to the constant current module, and the input terminal IN- and the output terminal OUT- are grounded. The charge-discharge protection circuit can prevent the lithium battery 2 from overcharging and over-discharging.

[0024] Since lighting the lamp bead does not require a large current and it is only necessary to light it so that it can be recognized by the naked eye, the constant current module uses a constant current diode CRD to achieve constant current output. Also, because the current demand ranges of LED lamp beads with different chip series and parallel numbers are different, the constant current module uses 3 constant current diodes with different constant current values to flexibly switch the output current. One ends of the constant current diodes with different constant current values are respectively connected to the output terminal OUT+. The switching switch can selectively connect to one of the other ends of the constant current diodes with different constant current values. The lithium battery 2 uses a single-section lithium battery of 3.7V, which is small in size and occupies little space in the test pen. The voltage output by the lithium battery 2 can be boosted to about 30V through the boost circuit.

[0025] This portable patch LED lamp bead test pen further includes a Type-C charging port 1 provided at the top of the pen barrel. The Type-C charging port 1 is connected to the charge and discharge protection circuit, and can be charged using an ordinary mobile phone 5V charger, which is very convenient. At the bottom of the test pen, there are 2 adjustable-spacing positive and negative test probes 7. The test probes 7 have a support part and a test end that connects the support part and is provided at the bottom of the test probe 7. The test end is made of metal, the support part is made of insulating material and is hollow inside. The test end is electrically connected to the constant current output current switching circuit through a wire passing through the inside of the support part. A spring 8 is provided between the support parts of the test probes 7. An adjustment button 6 protrudes from the surface of the pen barrel of the test pen. The adjustment button 6 adjusts the length of the spring 8 to adjust the spacing between the test probes 7 to adapt to the pad spacing of the LED lamp beads.

[0026] This portable patch LED lamp bead test pen further includes a charge and discharge circuit protection board 3, a boost circuit board 4, and a constant current output current switching circuit board 51 provided inside the pen barrel. The charge and discharge circuit protection board 3 is provided with a charge and discharge protection circuit. The boost circuit board 4 is provided with a boost circuit. The constant current output current switching circuit board 51 is provided with a constant current output current switching circuit. An external switch 9 is provided on the test pen, which is a switch for controlling the functions of the test pen. An external constant current switching switch 52 is also provided on the test pen. The constant current switching switch 52 controls the switching switch to selectively connect to different constant current diodes with different constant current values to achieve the switching of the output current magnitude, and then lights the LED lamp beads through the test probes 7.

[0027] Please refer to Figure 3 , in Embodiment 2 of the present utility model, compared with Embodiment 1, only the constant current module is different. The constant current module of Embodiment 2 uses a current limiting resistor R to achieve constant current output. Similarly, in order to meet the current demand range of LED lamp beads with different chip series and parallel numbers, the constant current module uses 3 current limiting resistors with different resistance values. One ends of the current limiting resistors with different resistance values are respectively connected to the output terminal OUT+. The switching switch can selectively connect to the other ends of the current limiting resistors with different resistance values to achieve flexible switching of the output current.

[0028] The portable patch LED lamp bead test pen adopted by the present utility model is small, light, and convenient to carry. It does not need to set parameters, is easy to operate, reduces the dependence on the skill level of production employees, and at the same time meets the lighting tests of single-core and multi-core LED lamp beads, improving work efficiency.

[0029] The above embodiments are only preferred embodiments of the present utility model, and do not limit the protection scope of the present utility model accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A portable patch LED lamp bead test pen, characterized in that: It includes a battery and a charge and discharge protection circuit, a boost circuit, and a constant current output current switching circuit connected in sequence. The constant current output current switching circuit includes input terminals IN+ and IN- and output terminals OUT+ and OUT-. One end of the input terminal IN+ is connected to a switching switch, one end of the output terminal OUT+ is connected to a constant current module, and the switching switch is connected to the constant current module.

2. A portable patch LED lamp bead test pen as claimed in claim 1, characterized in that: The constant current module includes a constant current diode or a current limiting resistor, one end of the constant current diode or the current limiting resistor is connected to the switching switch, and the other end of the constant current diode or the current limiting resistor is connected to the output terminal OUT+.

3. A portable SMD LED lamp bead test pen as claimed in claim 1, characterized in that: The constant current module includes more than two constant current diodes with different constant current values, one end of the constant current diodes with different constant current values ​​is respectively connected to the output end OUT+, and the switching switch can selectively connect the other end of the constant current diodes with different constant current values.

4. A portable patch LED lamp bead test pen as claimed in claim 1, characterized in that: The constant current module includes more than two current limiting resistors with different resistance values, one end of the current limiting resistors with different resistance values ​​is respectively connected to the output end OUT+, and the switching switch can selectively connect to the other end of the current limiting resistors with different resistance values.

5. A portable SMD LED lamp bead test pen as claimed in claim 1, characterized in that: The test pen also includes two test probes with adjustable spacing, and an elastic member is arranged between the test probes.

6. A portable patch LED lamp bead test pen as claimed in claim 5, characterized in that: The test pen also includes an adjustment button protruding from the surface of the pen shaft, and the adjustment button adjusts the elastic member.

7. A portable SMD LED lamp bead test pen as claimed in claim 1, characterized in that: The test pen also includes a charging port, which is connected to the charge and discharge protection circuit.

8. A portable patch LED lamp bead test pen as claimed in claim 7, characterized in that: The charging port is a Micro USB port or a USB Type C port.

9. A portable SMD LED lamp bead test pen as claimed in claim 1, characterized in that: The battery is a polymer lithium battery.

Images