CN107147076A - A kind of LED under-voltage protecting circuit - Google Patents
A kind of LED under-voltage protecting circuit Download PDFInfo
- Publication number
- CN107147076A CN107147076A CN201710527998.4A CN201710527998A CN107147076A CN 107147076 A CN107147076 A CN 107147076A CN 201710527998 A CN201710527998 A CN 201710527998A CN 107147076 A CN107147076 A CN 107147076A
- Authority
- CN
- China
- Prior art keywords
- triode
- voltage
- resistance
- protecting circuit
- diode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
Abstract
The invention provides a kind of LED under-voltage protecting circuit, including resistance R1~R4, voltage-regulator diode D5, diode D6, the first triode Q1 and the second triode Q2 and reverse-blocking tetrode thyristor S；First triode Q1 base stage is connected with voltage-regulator diode D5 anode and resistance R1 one end respectively, first triode Q1 colelctor electrode is connected with voltage-regulator diode D5 negative terminal and the second triode Q2 emitter stage respectively, and the first triode Q1 emitter stage is connected with reverse-blocking tetrode thyristor S gate pole and resistance R2 one end respectively；Second triode Q2 base stage is connected with voltage-stabiliser tube D6 negative terminal, and the second triode Q2 colelctor electrode connects load；The one end of voltage-stabiliser tube D6 anode respectively with resistance R3 and the resistance R4 is connected, and the resistance R1~R4 other end is all grounded.Present invention, avoiding the use of capacity cell, the stability of circuit is improved, circuit is more succinct, reacted sensitiveer.
Description
Technical field：
The present invention relates to a kind of electronic circuit, more particularly to a kind of LED under-voltage protecting circuit.
Background technology：
Emergent industrial lamp is frequently run onto situations such as burst has a power failure, it is necessary to set the rechargeable batteries such as ni-mh, therefore to excessively deficient
Pressure protection has higher requirement.The under-voltage protecting circuit of prior art is usually using more capacity cell, because electric capacity is each
Secondary discharge and recharge can bring more heavy load, while electric capacity can also produce stray inductance, so that the filter effect of circuit is reduced, and influence electricity
Road stability.
The content of the invention：
(1) technical problem solved
In order to solve the above problems, the invention provides a kind of LED under-voltage protecting circuit, it is to avoid making for capacity cell
With.
(2) technical scheme
A kind of LED under-voltage protecting circuit, including resistance R1~R4, voltage-regulator diode D5, diode D6, the first triode
Q1 and the second triode Q2 and reverse-blocking tetrode thyristor S；The base stage of the first triode Q1 respectively with the voltage-regulator diode D5
Anode and the resistance R1 one end connection, the colelctor electrode of the first triode Q1 is respectively with the voltage-regulator diode D5's
Negative terminal and the second triode Q2 emitter stage connection, the emitter stage of the first triode Q1 are opened with the controllable silicon respectively
Close one end connection of S gate pole and the resistance R2；The base stage of the second triode Q2 connects with the negative terminal of the voltage-stabiliser tube D6
Connect, the colelctor electrode of the second triode Q2 connects load；The anode of the voltage-stabiliser tube D6 respectively with the resistance R3 and the electricity
R4 one end connection is hindered, the other end of the resistance R1~R4 is all grounded.
Further, the first triode Q1 is NPN type triode, and the second triode Q2 is PNP type triode.
(3) beneficial effect
The invention provides a kind of LED under-voltage protecting circuit, it is to avoid the use of capacity cell, improves the steady of circuit
Qualitative, circuit is more succinct, reacts sensitiveer.
Brief description of the drawings：
Fig. 1 is a kind of LED involved in the present invention under-voltage protecting circuit schematic diagram.
Embodiment：
Embodiment involved in the present invention is described in further details below in conjunction with the accompanying drawings.
As shown in figure 1, a kind of LED under-voltage protecting circuit, including resistance R1~R4, voltage-regulator diode D5, diode D6,
First triode Q1 and the second triode Q2 and reverse-blocking tetrode thyristor S；First triode Q1 base stage respectively with voltage-regulator diode
D5 anode and resistance R1 one end connection, the first triode Q1 colelctor electrode respectively with voltage-regulator diode D5 negative terminal and second
Triode Q2 emitter stage connection, the first triode Q1 emitter stage respectively with reverse-blocking tetrode thyristor S gate pole and resistance R2 one
End connection；Second triode Q2 base stage is connected with voltage-stabiliser tube D6 negative terminal, and the second triode Q2 colelctor electrode connects load；Voltage stabilizing
The one end of pipe D6 anode respectively with resistance R3 and resistance R4 is connected, and the resistance R1~R4 other end is all grounded.First triode
Q1 is NPN type triode, and the second triode Q2 is PNP type triode.
The bridge rectifier filter circuit that AC civil powers are constituted by diode D1~D4 and electric capacity C1, exports half-sine wave direct current
Voltage.When input AC civil powers are normal, the first triode Q1 base potential is higher, therefore the current potential of its emitter stage is also higher, controllable
Transwitch S is turned on, therefore the second triode Q2 is turned on, the load normal work of output end.When inputting AC city's electrical anomalies, first
Triode Q1 base potential step-down, causes the current potential of emitter stage also with step-down, reverse-blocking tetrode thyristor S shut-offs make the two or three pole
Pipe Q2 ends, and has cut off the power supply to load.
The invention provides a kind of LED under-voltage protecting circuit, it is to avoid the use of capacity cell, improves the steady of circuit
Qualitative, circuit is more succinct, reacts sensitiveer.
The above-described embodiments are merely illustrative of preferred embodiments of the present invention, not to the structure of the present invention
Think and scope is defined.On the premise of design concept of the present invention is not departed from, technology of this area ordinary person to the present invention
The all variations and modifications that scheme is made, all should drop into protection scope of the present invention, claimed technology contents of the invention,
All record in detail in the claims.
Claims (3)
1. a kind of LED under-voltage protecting circuit, it is characterised in that：Including resistance R1~R4, voltage-regulator diode D5, diode D6,
First triode Q1 and the second triode Q2 and reverse-blocking tetrode thyristor S；The base stage of the first triode Q1 respectively with it is described steady
Press one end connection of diode D5 anode and the resistance R1, the colelctor electrode of the first triode Q1 respectively with the voltage stabilizing
Diode D5 negative terminal and the second triode Q2 emitter stage connection, the emitter stage of the first triode Q1 respectively with institute
State one end connection of reverse-blocking tetrode thyristor S gate pole and the resistance R2；The base stage of the second triode Q2 and the voltage-stabiliser tube
D6 negative terminal connection, the colelctor electrode of the second triode Q2 connects load；The anode of the voltage-stabiliser tube D6 respectively with the resistance
R3 and the resistance R4 one end connection, the other end of the resistance R1~R4 are all grounded.
2. a kind of LED according to claim 1 under-voltage protecting circuit, it is characterised in that：The first triode Q1 is
NPN type triode.
3. a kind of LED according to claim 1 under-voltage protecting circuit, it is characterised in that：The second triode Q2 is
PNP type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710527998.4A CN107147076A (en) | 2017-06-30 | 2017-06-30 | A kind of LED under-voltage protecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710527998.4A CN107147076A (en) | 2017-06-30 | 2017-06-30 | A kind of LED under-voltage protecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107147076A true CN107147076A (en) | 2017-09-08 |
Family
ID=59784964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710527998.4A Withdrawn CN107147076A (en) | 2017-06-30 | 2017-06-30 | A kind of LED under-voltage protecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107147076A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201044157A (en) * | 2009-06-09 | 2010-12-16 | Kerio Technologies Inc | Power supply terminal with conduction threshold non-active component set and the power supply |
| CN105846402A (en) * | 2016-06-01 | 2016-08-10 | 江苏安纳金机械有限公司 | Power source protection circuit |
| CN206977025U (en) * | 2017-06-30 | 2018-02-06 | 湖州灵感电子科技有限公司 | A kind of LED under-voltage protecting circuit |
-
2017
- 2017-06-30 CN CN201710527998.4A patent/CN107147076A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201044157A (en) * | 2009-06-09 | 2010-12-16 | Kerio Technologies Inc | Power supply terminal with conduction threshold non-active component set and the power supply |
| CN105846402A (en) * | 2016-06-01 | 2016-08-10 | 江苏安纳金机械有限公司 | Power source protection circuit |
| CN206977025U (en) * | 2017-06-30 | 2018-02-06 | 湖州灵感电子科技有限公司 | A kind of LED under-voltage protecting circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20170908 |
|
| WW01 | Invention patent application withdrawn after publication |