Direct current indicator lamp with test loop

Abstract

The utility model discloses a direct current indicating lamp with a test loop, which belongs to the technical field of low-voltage digital circuit systems and is technically characterized by comprising a diode D1, a diode D2, an indicating bulb L1 and a lampshade of a direct current indicating bulb. Wherein the diode D1 and the diode D2 are connected in parallel, and after being connected in parallel, the diode D1 and the diode D2 are connected with the positive electrode end of the indicating bulb L1. According to the utility model, through the parallel connection structure of the diode D1 and the diode D2, the line OR logic function is realized, which means that as long as any one of the input is high level, the output is high level, and the indicating bulb L1 is on. Through the test terminal A and the power supply driving terminal B, a user of the direct-current indicating lamp can test and debug the low-voltage indicating lamp L1 under the condition that normal logic operation is not interfered, and the structure allows an engineer to easily judge the working state of each diode, so that potential problems are quickly positioned and repaired.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-voltage digital circuit systems, and in particular relates to a DC indicator light with a test loop. Background Art

[0002] A circuit that uses digital signals to perform arithmetic and logical operations on digital quantities is called a digital circuit, or a digital system. Because it has logical operations and logic processing functions, it is also called a digital logic circuit. Modern digital circuits are constructed from a number of digital integrated devices made by semiconductor technology. Logic gates are the basic units of digital logic circuits. On the whole, digital circuits can be divided into two categories: combinational logic circuits and sequential logic circuits.

[0003] With the development of electronic technology, digital circuits are used more and more widely. Detecting whether the test indicator light is good or bad and whether it works normally is an important part of modern control engineering. For this reason, we propose a DC indicator light with a test circuit to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a DC indicator light with a test circuit to solve the problems raised in the above background technology.

[0005] To achieve the above object, the utility model provides the following technical solutions: a DC indicator light with a test circuit, comprising a diode D1, a diode D2, an indicator bulb L1, and a lampshade of the DC bulb;

[0006] The diode D1 and the diode D2 are connected in parallel, and the diode D1 and the diode D2 are connected in parallel and then connected to the positive terminal of the indicator bulb L1.

[0007] Preferably, the circuit further comprises a test terminal A and a power supply drive terminal B, the test terminal A is connected in parallel with the diode D2, and the power supply drive terminal B is connected with the diode D1.

[0008] Preferably, the circuit has a power supply terminal C, which is connected to the negative pole of the indicator light L1.

[0009] Compared with the prior art, the utility model has the following beneficial effects: the utility model realizes the line OR logic function through the parallel structure of diodes D1 and D2. This means that as long as any one of the inputs is at a high level, the output will be at a high level, thereby driving the indicator light L1 to light up. This clear logic function makes the circuit easy to integrate and apply in digital systems;

[0010] Through the test terminal A and the drive terminal B, the circuit designer can test and debug the indicator light L1 without interfering with the normal logic operation. This structure also allows engineers to check the working status of each diode without disassembling the circuit, so as to quickly locate and repair potential problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The utility model is a circuit working principle diagram of a low-voltage DC indicator light. DETAILED DESCRIPTION

[0012] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0013] See also Figure 1 , the utility model provides a DC indicator light with a test circuit, including a diode D1, a diode D2, an indicator light L1 and a DC bulb shade;

[0014] The diode D1 and the diode D2 are connected in parallel, and the diode D1 and the diode D2 are connected in parallel and then connected to the positive terminal of the indicator light L1.

[0015] In this embodiment, the circuit further includes a test terminal A and a power supply drive terminal B. The test terminal A is connected to the diode D2, and the test terminal B is connected to the diode D1.

[0016] In this embodiment, the circuit power supply terminal C is connected to the negative electrode of the indicator light L1.

[0017] Further, the parts are introduced in detail: Diodes D1 and D2: They are logic switches used to control the on and off of current.

[0018] Indicator light L1: Usually an LED light, used to indicate the status of the circuit.

[0019] The DC bulb housing refers to the external packaging of the LED lamp itself and D1 and D2.

[0020] Test terminal A: used to test or debug the circuit without affecting the normal logic function.

[0021] Power supply terminals B and C: provide driving power for the DC indicator light and control the on and off of the DC indicator light.

[0022] Working principle:

[0023] Normal logic works:

[0024] When the power supply terminal C provides power, if any end of the diode D1 or D2 receives a high-level signal (usually a positive voltage of the power supply voltage), the corresponding diode will be turned on.

[0025] Once the diode is turned on, current will flow through the diode and the indicator bulb L1, making L1 light up. Therefore, as long as either D1 or D2 is turned on, L1 will light up, indicating an "OR" logic function.

[0026] If both D1 and D2 are cut off (i.e. neither receives a high level signal), L1 will not light up.

[0027] Test circuit operation:

[0028] Through the test terminal A, the DC indicator light can be tested independently without changing other circuits.

[0029] When a DC low voltage is provided through the test terminal A and the power supply drive terminal B, the logic function of D1 and D2 can be directly tested to see if they are normal. For example, if a high level signal is applied through A and B, L1 should light up, indicating that the corresponding diode is working properly.

[0030] Power connection:

[0031] The power supply terminal C provides a direct current path for the entire circuit through a 0V power supply, so that the circuit can work normally.

[0032] The negative pole of the indicator light L1 is connected to the power supply terminal C to form a complete current loop.

[0033] Furthermore, the low-voltage DC indicator light of the utility model has a test terminal on its body for randomly testing whether the indicator light is good or bad and whether it is working normally. The DC indicator light range is a standard DC low-voltage drive, such as the following low-voltage DC indicator lights:

[0034] A.5VDC;

[0035] B.12VDC;

[0036] C.24VDC;

[0037] D.36VDC.

[0038] This patent adds a power supply drive and uses a diode or gate logic control circuit inside the indicator light housing to randomly check whether the indicator light is normal.

[0039] The DC indicator light with test circuit can be installed on the panel or board.

Claims

1. A DC indicator light with a test circuit, characterized in that: It includes a diode D1, a diode D2, an indicator light L1 and a DC light bulb shade; The diode D1 and the diode D2 are connected in parallel, and the diode D1 and the diode D2 are connected in parallel and then connected to the positive terminal of the indicator light L1.

2. A DC indicator light with a test circuit according to claim 1, characterized in that: It also includes a test terminal A and a power supply drive terminal B. The test terminal A is connected to the diode D2, and the drive terminal B is connected to the diode D1.

3. A DC indicator light with a test circuit according to claim 1, characterized in that: It also includes a power supply terminal C, which is connected to the negative pole of the indicator bulb L1.

4. A DC indicator light with a test circuit according to claim 1, characterized in that: The DC bulb, diode D1 and diode D2 are all installed inside the lampshade of the indicator light L1.

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