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An input undervoltage alarm circuit

A technology of alarm circuit and input undervoltage, which is applied in the direction of measuring electrical variables, measuring current/voltage, measuring devices, etc., can solve the problems of high cost, many circuit components, complex circuits, etc., and achieve the effect of preventing burnout and increasing service life

Active Publication Date: 2017-10-13
SHENZHEN OCEANS KING LIGHTING ENG CO LTD +1
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  • Abstract
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Problems solved by technology

[0003] The above-mentioned circuit devices are many, the circuit is more complicated, and the cost is higher

Method used

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  • An input undervoltage alarm circuit

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Embodiment Construction

[0014] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0015] Please refer to figure 1 , an input undervoltage alarm circuit, including operational amplifier U1, photocoupler U2, transistors Q1, Q2, three-terminal shunt regulator D1, buzzer T1, light source, resistors R1, R2, R3, R4; U1 the first Pin 1 is connected to the third pin of D1; the second pin of U1 is connected to the input terminal of the input undervoltage alarm circuit, one end of R4, one end of R3, one end of R1 and one end of the light source; the third...

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Abstract

The embodiment of the present invention discloses an input undervoltage alarm circuit, which includes an operational amplifier U1, a photocoupler U2, transistors Q1 and Q2, a three-terminal shunt regulator D1, a buzzer T1, a light source, and resistors R1, R2 and R3 , R4; the first pin of U1 is connected to the third pin of D1; the second pin of U1 is respectively connected to the input terminal of the input undervoltage alarm circuit, one end of R4, one end of R3, one end of R1 and one end of the light source; the third pin of U1 is respectively connected to the base of Q2 And the base of Q1 is connected; the first pin of U1 is connected to the collector of Q1 and the other end of R1; the second pin of U2 is connected to one end of T1, the emitter of Q2, the emitter of Q1 and one end of R2; the third pin of U2 is connected to the other end of R2 Connect; U2 pin 4 is connected to the other end of the light source. Adopting the present invention has the advantages of effectively protecting the input under-voltage, alarming the user in time, preventing components from being burned, and increasing the service life of the circuit.

Description

technical field [0001] The invention relates to an alarm circuit, in particular to an input undervoltage alarm circuit. Background technique [0002] Comparing the documents of undervoltage alarm method, undervoltage alarm circuit and switching power supply (Chinese Patent Application No. 200610001956.9), a method for identifying the cause of the shortage when the output voltage is less than or equal to the undervoltage set value and giving an alarm is disclosed, including: the first In the comparison step, the output voltage is compared with a fixed first undervoltage set value; in the second comparison step, the output voltage is compared with a second undervoltage set value that is delayed and followed relative to the output voltage. Based on two steps to identify the cause of insufficient output voltage and give an alarm. Preferably, the first undervoltage setting value is set according to the reverse conduction voltage of the Zener diode, and the second undervoltage se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/165
Inventor 周明杰杨小军
Owner SHENZHEN OCEANS KING LIGHTING ENG CO LTD
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