Line self-identification detection circuit of non-coding audible and visual alarm

Abstract

The utility model discloses a line self-identification detection circuit of a non-coding audible and visual alarm, comprising a first voltage output end L1 and a second voltage output end L2, the first voltage output end L1 is connected in parallel with a first end of a first resistor R1 and a first end of a diode D1 at the same time; the second end of the first resistor R1 is simultaneously connected with the second end of the diode D1, the first end of the second resistor R2 and the first end of the first capacitor C1, the second end of the first capacitor C1 is grounded, the second end of the second resistor R2 is connected with the base electrode of the triode Q1, the collector electrode of the triode Q1 is connected with the first ends of the third resistor R3 and the fourth resistor R4, and the emitter electrode of the triode Q1 is grounded. According to the self-identification detection circuit, the first voltage output end L1 and the second voltage output end L2 have two different power supply states in the forward direction and the reverse direction, the two states are judged through continuous high and low levels of output signals, and an acousto-optic product decides to output two different tones.

Description

Technical Field

[0001] The utility model relates to fire alarm equipment, in particular to a line self-identification detection circuit on a non-coding sound and light product. Background Art

[0002] Non-coded sound and light alarm is a sound and light alarm device installed on site. When a fire occurs and is confirmed on site, the fire sound and light alarm installed on site can be activated by the fire alarm controller of the fire control center to send out a strong sound and light alarm signal to alert the on-site personnel. Non-coded sound and light alarm is a sound and light alarm device installed on site. It is a non-coded sound and light product with non-polarity input power supply connection. It needs to identify the positive and negative voltage status of the two input lines to drive two different tones. Under the condition of positive power supply, the sound and light drive sounds an alarm sound; under the condition of reverse power supply, the sound and light drive sounds a prevention and control sound. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a line self-identification detection circuit of a non-coding sound and light alarm, input two different power supply voltages, forward and reverse, judge two driving states through the continuous high and low levels of the output signal, and decide to output two different tones.

[0004] In order to solve the above technical problems, the utility model provides a line self-identification detection circuit of a non-coding sound and light alarm, which includes a first voltage output terminal L1 and a second voltage output terminal L2. The first voltage output terminal L1 is simultaneously connected in parallel to the first end of a first resistor R1 and the first end of a diode D1. The second end of the first resistor R1 is simultaneously connected to the second end of the diode D1, the first end of the second resistor R2 and the first end of the first capacitor C1. The second end of the first capacitor C1 is grounded, the second end of the second resistor R2 is connected to the base of a transistor Q1, the collector of the transistor Q1 is connected to the first ends of a third resistor R3 and a fourth resistor R4, and the emitter of the transistor Q1 is grounded.

[0005] A further optimized solution is: the first voltage output terminal L1 and the second voltage output terminal L2 are connected to the first interface AC1 and the second interface AC2 of the rectifier bridge U1.

[0006] A further optimized solution is: the third interface V+ and the fourth interface V− of the rectifier bridge U1 are connected to the first end and the second end of the second capacitor C2.

[0007] A further optimization solution is: the second end of the capacitor C2 is grounded, and the first end of the capacitor C2 is connected to the voltage end V0.

[0008] A further optimization solution is: the second end of the fourth resistor R4 is connected to the signal terminal IO.

[0009] The technical effect of the utility model is that the utility model discloses a line self-identification detection circuit of a non-coding sound and light alarm, and the first voltage output terminal L1 and the second voltage output terminal L2 have two different power supply states, forward and reverse, and the two states are judged by the continuous high and low levels of the output signal, and the sound and light product determines to output two different tones. In addition, there is a synchronization signal in the DC input voltage waveform between the first voltage output terminal L1 and the second voltage output terminal L2, and a periodic instantaneous input power-off form of a down-jump waveform, and the power-off waveform does not affect the detection state of the detection circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural diagram of the line self-identification detection circuit of the non-coding sound and light alarm. DETAILED DESCRIPTION

[0011] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[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] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0014] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0015] like Figure 1 As shown, the utility model discloses a line self-identification detection circuit of a non-coding sound and light alarm, which includes a first voltage output terminal L1 and a second voltage output terminal L2, the first voltage output terminal L1 is connected in parallel with the first end of the first resistor R1 and the first end of the diode D1, the second end of the first resistor R1 is connected to the second end of the diode D1, the first end of the second resistor R2 and the first end of the first capacitor C1, the second end of the first capacitor C1 is grounded, the second end of the second resistor R2 is connected to the base of the transistor Q1, the collector of the transistor Q1 is connected to the first ends of the third resistor R3 and the fourth resistor R4, and the emitter of the transistor Q1 is grounded. The first end of the capacitor C2 is connected to the voltage terminal V0, the second end of the capacitor C2 is grounded, and the second end of the fourth resistor R4 is connected to the signal terminal IO.

[0016] The first voltage output terminal L1 and the second voltage output terminal L2 are connected to the first interface AC1 and the second interface AC2 of the rectifier bridge U1. The third interface V+ and the fourth interface V- of the rectifier bridge U1 are connected to the first end and the second end of the second capacitor C2.

[0017] The line self-identification detection circuit of the utility model non-coding sound and light alarm adopts 24V DC input power supply, the input power supply adopts non-polarity input mode, and the input end adopts a rectifier bridge to perform non-polarity input processing to supply power for subsequent electrical equipment.

[0018] When a positive 24V voltage is input between the first voltage output terminal L1 and the second voltage output terminal L2, and the first voltage output terminal L1 is input with respect to the second voltage output terminal L2 as a positive voltage, the ground GND is forwardly connected to the second voltage output terminal L2 through the diode D1, and the first voltage output terminal L1 is a positive voltage with respect to the ground GND. The voltage charges the capacitor C1 through the diode D1, and the voltage on C1 drives the transistor Q1 to turn on through R2. After the transistor Q1 is turned on, the collector C pole voltage is pulled down, and the signal input to IO through R4 is a low level.

[0019] When the first voltage output terminal L1 is a negative voltage relative to the second voltage output terminal L2, GND is forwardly connected to the first voltage output terminal L1 through a diode, and the first voltage output terminal L1 is a negative voltage of a diode D1 voltage drop relative to GND. After the first voltage output terminal L1 is connected to C1 through the first resistor R1, a negative voltage relative to the ground GND is generated on the capacitor C1, which cannot drive the transistor Q1 to conduct. The C-pole voltage of the transistor Q1 is a high level, and the signal input to the signal terminal IO through the fourth resistor R4 is a high level. Under two different input states, the level state of the input to the processor detection signal terminal IO port is inconsistent, so the input state is effectively identified.

[0020] There is a synchronization signal in the DC input voltage between the first voltage output terminal L1 and the second voltage output terminal L2. The signal is a pulse signal that is pulled down to zero potential for 5ms and is generated once every 500ms. It is a status signal for synchronization identification of the product. The existence of this pull-down signal cannot affect the input status detection level signal. When the first voltage output terminal L1 is a forward voltage input relative to the second voltage output terminal L2, the capacitor C1 is fully charged through the diode D1 under normal voltage, which prompts the transistor Q1 to be reliably turned on. When the synchronization signal is generated, the first voltage output terminal L1 is zero voltage relative to the second voltage output terminal L2. Within 5ms, the capacitor C1 is discharged through the first resistor R1. Due to the inhibitory effect of the first resistor R1, a part of the capacitor voltage on C1 is discharged in a short time, but the residual voltage can still ensure the stable conduction of the transistor Q1. After the synchronization signal disappears, the first voltage output terminal L1 continues to generate voltage to the second voltage output terminal L2, and the capacitor C1 continues to be fully charged through the diode D1, ensuring the stable conduction of the transistor Q1 under the condition of the synchronization signal, and continuously outputting a low level to the processor. When the first voltage output terminal L1 is a negative voltage relative to the second voltage output terminal L2, regardless of whether there is a synchronization signal, the first voltage output terminal L1 is at a low potential relative to GND, the transistor Q1 is always in the cut-off state, and the signal input to the processor is always at a high level, which also does not affect the change of the output detection state.

[0021] The above-described embodiments are only preferred embodiments for fully illustrating the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or changes made by technicians in the technical field on the basis of the present utility model are all within the protection scope of the present utility model. The protection scope of the present utility model shall be subject to the claims.

Claims

1. A line self-identification detection circuit for a non-coding sound and light alarm, characterized in that: It includes a first voltage output terminal L1 and a second voltage output terminal L2. The first voltage output terminal L1 is connected in parallel to the first end of the first resistor R1 and the first end of the diode D1. The second end of the first resistor R1 is connected to the second end of the diode D1, the first end of the second resistor R2 and the first end of the first capacitor C1. The second end of the first capacitor C1 is grounded. The second end of the second resistor R2 is connected to the base of the transistor Q1. The collector of the transistor Q1 is connected to the first ends of the third resistor R3 and the fourth resistor R4. The emitter of the transistor Q1 is grounded.

2. The line self-identification detection circuit of the non-coding sound and light alarm according to claim 1 is characterized in that: The first voltage output terminal L1 and the second voltage output terminal L2 are connected to the first interface AC1 and the second interface AC2 of the rectifier bridge U1 .

3. The line self-identification detection circuit of the non-coding sound and light alarm according to claim 2 is characterized in that: The third interface V+ and the fourth interface V− of the rectifier bridge U1 are connected to the first end of the second capacitor C2 and the second end of the second capacitor C2.

4. The line self-identification detection circuit of the non-coding sound and light alarm according to claim 3 is characterized in that: The second end of the capacitor C2 is grounded, and the first end of the capacitor C2 is connected to the voltage end V0.

5. The line self-identification detection circuit of the non-coding sound and light alarm according to claim 1 is characterized in that: The second end of the fourth resistor R4 is connected to the signal terminal IO.

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