CN205643475U - Simple transformer input low voltage detect circuit - Google Patents
Simple transformer input low voltage detect circuit Download PDFInfo
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- CN205643475U CN205643475U CN201620293822.8U CN201620293822U CN205643475U CN 205643475 U CN205643475 U CN 205643475U CN 201620293822 U CN201620293822 U CN 201620293822U CN 205643475 U CN205643475 U CN 205643475U
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Abstract
The utility model discloses a simple transformer input low voltage detect circuit connects between transformer T1 and power consumption product, including zener diode Z1, NPN type triode Q2, PNP type triode Q1, first resistance R1, third resistance R3, during the input of commercial power 220V, transformer T1 output voltage is normal, reaches zener diode Z1's steady voltage scope, and zener diode Z1 switches on, and NPN type triode Q2's base was the high level this moment, and NPN type triode Q2 switch on, and PNP type triode Q1's base is the low level, and PNP type triode Q1 switch on, and output voltage uses in the power consumption product, when the line voltage floated decline, transformer T1 output voltage descended, and when dropping to the zener diode Z1 setting value, voltage is less than zener diode Z1's steady voltage scope, and zener diode Z1 ends, and NPN type triode Q2's base was ended for the low level this moment, and PNP type triode Q1's base is ended for the high level to reach the low voltage detect mesh.
Description
Technical field
This utility model relates to a kind of transformator input low-voltage detection circuit, inputs low-voltage detection circuit particularly to the simple transformator of one.
Background technology
Transformator is often applied between mains electricity input end and electricity consumption product, but mains electricity input end can't be always held at 220V, and the voltage of civil power can float, and when civil power floating range declines, and after dropping to certain degree, electricity consumption product can be caused damage.In prior art; the parts of the high costs such as IC chip and MCU can be connected into solve the problems referred to above between transformator and electricity consumption product; output can be turned off when making when civil power floating range declines and drop to setting value; thus there is protection or emergency function; there is low voltage test function, but relatively costly.
Therefore, how to realize a kind of simple and reasonable, can realize low voltage test function, cost-effective simple transformator input low-voltage detection circuit is technical problem the most urgently to be resolved hurrily.
Utility model content
Main purpose of the present utility model is to provide a kind of simple transformator input low-voltage detection circuit, it is intended to realize a kind of simple and reasonable, can realize low voltage test function, cost-effective simple transformator input low-voltage detection circuit.
The utility model proposes a kind of simple transformator input low-voltage detection circuit, be connected between transformator T1 and electricity consumption product, including Zener diode Z1, NPN type triode Q2, PNP type triode Q1, the first resistance R1, the 3rd resistance R3；During civil power 220V input, transformator T1 output voltage is normal, reach the voltage stabilized range of Zener diode Z1, Zener diode Z1 turns on, now the base stage of NPN type triode Q2 is high level, and NPN type triode Q2 turns on, and the base stage of PNP type triode Q1 is low level, PNP type triode Q1 turns on, and applies in output voltage to electricity consumption product；When line voltage floats and declines, transformator T1 output voltage declines, when dropping to Zener diode Z1 setting value, the voltage voltage stabilized range less than Zener diode Z1, Zener diode Z1 ends, now the base stage of NPN type triode Q2 is that low level is ended, and the base stage of PNP type triode Q1 is that high level ends, thus reaches low voltage test purpose；Regulation Zener diode Z1, the first resistance R1, the capable setting parameter low voltage test scope of the 3rd resistance R3.
Preferably, the outfan of transformator T1 connects rectifier bridge.
Preferably, transformator input low-voltage detection circuit also includes the first electric capacity C1, the 3rd electric capacity C3.
The utility model discloses a kind of novel transformator input low-voltage detection circuit; when this circuit is suitable for the decline of civil power floating range; the protection or emergency function exported and make can be turned off when dropping to setting value; can be applicable on the market in some fire emergency lamps; for some mid and low-end products; without use IC chip or the contour cost approach of MCU to realize low voltage test function, cost-effective.This utility model achieves a kind of simple and reasonable, can realize low voltage test function, cost-effective simple transformator input low-voltage detection circuit.
Accompanying drawing explanation
Fig. 1 is the electric circuit construction schematic diagram of an embodiment of a kind of simple transformator of this utility model input low-voltage detection circuit.
The realization of this utility model purpose, functional characteristics and advantage will in conjunction with the embodiments, are described further referring to the drawings.
Detailed description of the invention
Should be appreciated that specific embodiment described herein, only in order to explain this utility model, is not used to limit this utility model.
With reference to Fig. 1, one embodiment of a kind of simple transformator of the present utility model input low-voltage detection circuit is proposed, it is connected between transformator T1 and electricity consumption product, including Zener diode Z1, NPN type triode Q2, PNP type triode Q1, the first resistance R1, the 3rd resistance R3.
During civil power 220V input, transformator T1 output voltage is normal, reach the voltage stabilized range of Zener diode Z1, Zener diode Z1 turns on, now the base stage of NPN type triode Q2 is high level, and NPN type triode Q2 turns on, and the base stage of PNP type triode Q1 is low level, PNP type triode Q1 turns on, and applies in output voltage to electricity consumption product；When line voltage floats and declines, transformator T1 output voltage declines, when dropping to Zener diode Z1 setting value, the voltage voltage stabilized range less than Zener diode Z1, Zener diode Z1 ends, now the base stage of NPN type triode Q2 is that low level is ended, and the base stage of PNP type triode Q1 is that high level ends, thus reaches low voltage test purpose.
Regulation Zener diode Z1, the first resistance R1, the capable setting parameter low voltage test scope of the 3rd resistance R3.
The outfan of transformator T1 connects rectifier bridge.
Transformator input low-voltage detection circuit also includes the first electric capacity C1, the 3rd electric capacity C3.
The utility model discloses a kind of novel transformator input low-voltage detection circuit; when this circuit is suitable for the decline of civil power floating range; the protection or emergency function exported and make can be turned off when dropping to setting value; can be applicable on the market in some fire emergency lamps; for some mid and low-end products; without use IC chip or the contour cost approach of MCU to realize low voltage test function, cost-effective.This utility model achieves a kind of simple and reasonable, can realize low voltage test function, cost-effective simple transformator input low-voltage detection circuit.
The foregoing is only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every equivalent structure transformation utilizing this utility model description and accompanying drawing content to be made; or directly or indirectly it is used in other relevant technical fields, the most in like manner it is included in scope of patent protection of the present utility model.
Claims (3)
1. a simple transformator input low-voltage detection circuit, it is characterised in that be connected between transformator T1 and electricity consumption product, including Zener diode Z1, NPN type triode Q2, PNP type triode Q1, the first resistance R1, the 3rd resistance R3；
During civil power 220V input, transformator T1 output voltage is normal, reach the voltage stabilized range of Zener diode Z1, Zener diode Z1 turns on, now the base stage of NPN type triode Q2 is high level, and NPN type triode Q2 turns on, and the base stage of PNP type triode Q1 is low level, PNP type triode Q1 turns on, and applies in output voltage to electricity consumption product；When line voltage floats and declines, transformator T1 output voltage declines, when dropping to Zener diode Z1 setting value, the voltage voltage stabilized range less than Zener diode Z1, Zener diode Z1 ends, now the base stage of NPN type triode Q2 is that low level is ended, and the base stage of PNP type triode Q1 is that high level ends, thus reaches low voltage test purpose；
Regulation Zener diode Z1, the first resistance R1, the capable setting parameter low voltage test scope of the 3rd resistance R3.
One the most according to claim 1 simple transformator input low-voltage detection circuit, it is characterised in that the outfan of transformator T1 connects rectifier bridge.
One the most according to claim 2 simple transformator input low-voltage detection circuit, it is characterised in that transformator input low-voltage detection circuit also includes the first electric capacity C1, the 3rd electric capacity C3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620293822.8U CN205643475U (en) | 2016-04-11 | 2016-04-11 | Simple transformer input low voltage detect circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620293822.8U CN205643475U (en) | 2016-04-11 | 2016-04-11 | Simple transformer input low voltage detect circuit |
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| CN205643475U true CN205643475U (en) | 2016-10-12 |
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| CN201620293822.8U Active CN205643475U (en) | 2016-04-11 | 2016-04-11 | Simple transformer input low voltage detect circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110646659A (en) * | 2019-09-26 | 2020-01-03 | 浙江榆阳电子有限公司 | Sampling precision and hysteresis control lifting circuit |
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2016
- 2016-04-11 CN CN201620293822.8U patent/CN205643475U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110646659A (en) * | 2019-09-26 | 2020-01-03 | 浙江榆阳电子有限公司 | Sampling precision and hysteresis control lifting circuit |
| CN110646659B (en) * | 2019-09-26 | 2021-07-30 | 浙江榆阳电子有限公司 | Sampling precision and hysteresis control lifting circuit |
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