Universal test lamp power supply control circuit

Abstract

The utility model relates to a universal test lamp power supply control circuit, which comprises a power supply, a voltage regulation module and a current and voltage test meter, the current and voltage test meter comprises a red meter pen interface, a black meter pen interface, an anode input port and a cathode input port. The voltage regulation module comprises a first resistor, a second resistor, an NPN triode, a third resistor, a first capacitor and a plurality of wires. Each wire comprises a first node, a second node and a third node. The first node is electrically connected with the positive electrode of the power supply; the first resistor is located on the wire between the first node and the third node, the second resistor is located on the wire between the first node and the second node, and the third resistor is located on the wire between the second node and the third node; the base of the NPN triode is connected with the third node, and the collector is connected with the second node; the second node is connected with the positive electrode input port through a wire, and the first capacitor is located on the wire. According to the utility model, the trouble of visual inspection of whether the LED lamps are turned on one by one by staff is avoided, and misjudgment is effectively avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to detection circuit technical field, especially relate to a general type measures lamp power control circuit. BACKGROUND

[0002] In recent years, with the rapid development of LED technology, LED products have been widely used in various fields, such as commercial advertising, sports events, transportation hubs, education, medical treatment, smart home, etc. LED has become the mainstream technology in the field of lighting and display with its advantages of high efficiency, energy saving, environmental protection and long service life. However, with the continuous expansion of application fields, the requirements for the quality and stability of LED products are becoming higher and higher, therefore, the detection and power control of LED are particularly important.

[0003] When the input voltage is detected, the visual inspection method is not practical. Because the LED has a high density on the PCB board, and when the LED light color and brightness are close, visual inspection is easy to produce misjudgment. Manual detection cannot cope with more and more fine products.

[0004] Chinese patent CN117471152A discloses a low-power-consumption voltage detection circuit, which can reduce circuit power consumption and cost, and reduce circuit volume; in addition, after the circuit is powered on, in the case of under-voltage or over-voltage of the input voltage, the corresponding level is directly output through the output end, the input voltage is detected, and the safety and reliability of the circuit are improved. However, this circuit structure is complex, and cannot directly feedback whether the parallel LED has quality problems.

[0005] Therefore, it is necessary to provide a new detection circuit to solve the above problems. UTILITY MODEL CONTENT

[0006] The main purpose of the utility model is to provide a general type measures lamp power control circuit, which can quickly and accurately complete the detection of parallel LED circuit and avoid misjudgment.

[0007] The utility model discloses a general type measures lamp power control circuit, including power supply, voltage regulation module and current voltage test table, the current voltage test table includes red table pen interface, black table pen interface, positive input and negative input, the negative input is grounded, the voltage regulation module includes first resistance, second resistance, NPN triode, third resistance, first electric capacity and a plurality of wires, and the wire includes first node, second node and third node, the first node is connected with the positive pole of power supply, and the negative pole of power supply is grounded, the first resistance is located the wire between the first node and the third node, the second resistance is located the wire between the first node and the second node, and the third resistance is located the wire between the second node and the third node, the emitter of NPN triode is grounded, and the base is connected with the third node, and the collector is connected with the second node, and the second node is connected with the positive input through wire and first electric capacity is located the wire.

[0008] Specifically, the voltage regulation module further comprises an adjusting resistor, and the adjusting resistor is located on the wire between the first node and the positive pole of the power supply.

[0009] Further, the voltage regulation module further comprises a second capacitor, and the second capacitor is connected in parallel on the wire between the first node and the third node.

[0010] Specifically, the voltage regulation module further comprises an adjusting resistor, and the adjusting resistor is located on the wire between the first node and the positive pole of the power supply.

[0011] The utility model discloses the beneficial effects of the technical scheme are as follows:

[0012] The utility model discloses the beneficial effects of the technical scheme are as follows: DRAWINGS

[0013] Figure 1 The utility model discloses the beneficial effects of the technical scheme are as follows:

[0014] The utility model discloses the beneficial effects of the technical scheme are as follows:

[0015] 1-power supply;

[0016] 2-Voltage regulation module, 2a-First node, 2b-Second node, 2c-Third node, 21-Regulating resistor, 22-First resistor, 23-Second resistor, 24-NPN transistor, 25-Third resistor, 26-First capacitor, 27-Second capacitor;

[0017] 3-Current and voltage tester, 31-Red probe interface, 32-Black probe interface;

[0018] 4-Speakers. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to specific embodiments.

[0020] Example:

[0021] like Figure 1 As shown, this utility model provides a general-purpose lamp power control circuit, which includes a power supply 1, a voltage regulation module 2, a current and voltage tester 3, and a speaker 4.

[0022] like Figure 1 As shown, the current and voltage test meter 3 includes a red probe interface 31, a black probe interface 32, a positive input port (IN+), a negative input port (IN-), a positive output port (OUT+), and a negative output port (OUT-). The negative input port is grounded, and the speaker 4 is electrically connected between the positive output port and the negative output port.

[0023] The red probe interface 31 connects to the red probe, and the black probe interface 32 connects to the black probe. The red probe interface 31 generally has a higher potential than the black probe interface 32, and in this embodiment, it is used to connect the two terminals of the parallel LEDs. The positive and negative input ports are grouped together, and the input is the voltage of the power supply 1 after being regulated by the voltage regulation module 2. The parallel LEDs can be considered as a resistor with a stable resistance value. Unless the LEDs are not lit or are missing, this resistance value should normally be within a reasonable range. This invention is used to detect the total circuit operating current under constant voltage conditions by directly contacting the positive and negative terminals of the parallel LED circuit with the red and black probes, thus detecting whether all LEDs are lit. This eliminates the hassle of employees visually inspecting each LED individually and effectively avoids misjudgment when the LED colors and brightness are similar.

[0024] like Figure 1As shown, the voltage regulation module 2 includes an adjustment resistor 21, a first resistor 22, a second resistor 23, an NPN transistor 24, a third resistor 25, a first capacitor 26, a second capacitor 27, and several wires. The wires include a first node 2a, a second node 2b, and a third node 2c. The first node 2a is electrically connected to the positive terminal of the power supply 1. The adjustment resistor 21 is located on the wire between the first node 2a and the positive terminal of the power supply 1, and the negative terminal of the power supply 1 is grounded. The first resistor 22 is located on the wire between the first node 2a and the third node 2c, the second resistor 23 is located on the wire between the first node 2a and the second node 2b, and the third resistor 25 is located on the wire between the second node 2b and the third node 2c. The emitter of the NPN transistor 24 is grounded, its base is connected to the third node 2c, and its collector is connected to the second node 2b. The second node 2b is connected to the positive input port via a wire, and the first capacitor 26 is located on this wire. The second capacitor 27 is connected in parallel on the wire between the first node 2a and the third node 2c.

[0025] NPN transistor 24 is a transistor composed of two N-type semiconductors sandwiching a P-type semiconductor. The base is led out from the P-type semiconductor, while the emitter and collector are led out from the two N-type semiconductors respectively. NPN transistor 24 can amplify current and act as a switch. It can convert weak electrical signals into signals of a certain strength. This conversion follows the law of conservation of energy; it simply converts the energy of power supply 1 into signal energy. During normal amplification, the potentials between the first node 2a, the second node 2b, and the third node 2c decrease sequentially, and the potential difference between them increases or decreases proportionally. The total input voltage of voltage regulation module 2 is the voltage of power supply 1. By controlling the resistance of regulating resistor 21, the output voltage of voltage regulation module 2 can be changed, which is the potential difference between the first capacitor 26 and ground. The potential of ground is 0, which is equivalent to electrically connecting the negative terminal of power supply 1, the emitter of NPN transistor 24, and the negative input port. In this application, power supply 1 provides 12V, and adjusting resistor 21 allows the output voltage to vary within the range of 2.8V to 12V. The first capacitor 26 isolates DC current, stabilizing the output voltage of the voltage regulation module 2. A surge current is generated when power supply 1 is switched on. When this current reaches the third node 2c, the sudden increase is filtered out by the second capacitor 27 and then slowly released, thus preventing damage to the NPN transistor 24.

[0026] Power supply 1, voltage regulation module 2, and current / voltage tester 3 are all grounded, thus forming a double closed-loop current detection circuit. When the red and black probes touch the two terminals of the parallel LED, the aforementioned voltage is applied to the parallel LED, resulting in a current. Current / voltage tester 3 can determine whether the obtained current value is within the test range. If the result is negative, an alarm will be triggered via speaker 4. Current / voltage tester 3 can also trigger an alarm in other ways, such as digital display or indicator light alarm.

[0027] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A universal lamp power supply control circuit, characterized in that: The system includes a power supply, a voltage regulation module, and a current and voltage tester. The current and voltage tester includes a red probe interface, a black probe interface, a positive input port, and a negative input port, with the negative input port grounded. The voltage regulation module includes a first resistor, a second resistor, an NPN transistor, a third resistor, a first capacitor, and several wires, each wire containing a first node, a second node, and a third node. The first node is electrically connected to the positive terminal of the power supply, and the negative terminal of the power supply is grounded. The first resistor is located on the wire between the first node and the third node, the second resistor is located on the wire between the first node and the second node, and the third resistor is located on the wire between the second node and the third node. The emitter of the NPN transistor is grounded, the base is connected to the third node, and the collector is connected to the second node. The second node is connected to the positive input port via a wire, and the first capacitor is located on this wire.

2. The universal lamp power control circuit according to claim 1, characterized in that: The voltage regulation module further includes an adjustment resistor, which is located on the wire between the first node and the positive terminal of the power supply.

3. The universal lamp power control circuit according to claim 1 or 2, characterized in that: The voltage regulation module also includes a second capacitor, which is connected in parallel on the wire between the first node and the third node.

4. The universal lamp power control circuit according to claim 1, characterized in that: It also includes a speaker, and the current and voltage tester includes a positive output port and a negative output port, with the speaker electrically connected between the positive output port and the negative output port.

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