CN205726622U - DC failure detector circuit in lamp control system - Google Patents
DC failure detector circuit in lamp control system Download PDFInfo
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- CN205726622U CN205726622U CN201620656204.5U CN201620656204U CN205726622U CN 205726622 U CN205726622 U CN 205726622U CN 201620656204 U CN201620656204 U CN 201620656204U CN 205726622 U CN205726622 U CN 205726622U
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- resistance
- control system
- effect transistor
- lamp control
- stabilivolt
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Abstract
This utility model provides the DC failure detector circuit in a kind of lamp control system, it includes field-effect transistor, composition DC fault detect end is outwards drawn in the drain electrode of described field-effect transistor, the source ground of described field-effect transistor, the grid of described field-effect transistor is connected to by the first resistance, the partial pressure unit that stabilivolt and the second resistant series are constituted, first end of described first resistance obtains DC voltage from the output filter rectification unit of lamp control system, second end of described first resistance is connected to the negative electrode of stabilivolt, first end of described second resistance is connected with the anode of stabilivolt, second end ground connection of described second resistance, the grid of described field-effect transistor is connected to the anode of stabilivolt.The DC secondary fail of lamp control system can be detected by DC failure detector circuit like clockwork that the utility model proposes, and is maintained at relatively low power consumption levels, has higher promotional value.
Description
Technical field
This utility model relates to light fixture and controls technical field, the DC fault detect being specifically related in a kind of lamp control system
Circuit.
Background technology
Street lamp, shows the light fixture that road provides illumination functions, refers to the light fixture in the illumination zone of road surface in traffic lighting.With
Science and technology, the development of electron trade and progress, the controller system for light fixtures such as such as LED street lamp becomes all the more
Complexity, function also becomes diversification all the more.For the control system only controlling light fixture light on and off that tradition is original, it is clear that be
Improve a lot.Generally, LED street lamp is using mains electricity as power supply, and then this power supply is through power factor (PF) school
Positive circuit, LLC resonant converter control circuit and output filter rectifier flow to the street lamp of required power supply, now load
Voltage signal in LED street lamp is low-voltage dc signal.In this lamp control system, AC AC signal input side is defined as
Primary side, DC DC signal output side is defined as primary side.System is provided with AC fault detection unit to primary side, to primary side
It is provided with DC fault detection unit.DC fault detection unit peripheral component designed in current most of lamp control system
Many, voltage detecting is not accurate enough, and power dissipation ratio is relatively big, and how to be constituted with audion, and audion belongs to current drive-type element,
Ideal base drive current is required by it, and this makes the power consumption above divider resistance increase, and is unfavorable for DC fault detect.
Utility model content
For the deficiency in the presence of prior art, this utility model provides the DC fault in a kind of lamp control system
Testing circuit, the DC secondary fail of lamp control system can be detected, and be maintained at relatively low by like clockwork
Power consumption levels.
For achieving the above object, this utility model have employed following technical scheme:
A kind of DC failure detector circuit in lamp control system, it includes field-effect transistor (Q802),
Composition DC fault detect end is outwards drawn in the drain electrode of described field-effect transistor (Q802),
The source ground of described field-effect transistor (Q802),
The grid of described field-effect transistor (Q802) is connected to by the first resistance (R804), stabilivolt (ZD800) and
The partial pressure unit that two resistance (R802) are in series, the first end of described first resistance (R804) is from the output of lamp control system
Filter rectification unit obtains DC voltage, and the second end of described first resistance (R804) is connected to the negative electrode of stabilivolt (ZD800),
First end of described second resistance (R802) is connected with the anode of stabilivolt (ZD800), the second of described second resistance (R802)
End ground connection, the grid of described field-effect transistor (Q802) is connected to the anode of stabilivolt (ZD800).
Compared to prior art, this utility model has the advantages that
DC failure detector circuit in lamp control system provided by the utility model, the peripheral components of design is few, profit
Obtaining DC voltage by partial pressure unit from the output filter rectification unit of lamp control system, divider resistance is big, low in energy consumption, DC event
Barrier test side utilizes the drain electrode of metal-oxide-semiconductor to draw, as long as direct current output is normal, then and the drain electrode of metal-oxide-semiconductor then output low level, therefore DC
DC voltage detection accuracy improves.And abandoned traditional audion design, use field-effect transistor to carry out
Replacing, field-effect transistor is voltage mode control element, as long as the voltage between its gate-source has reached certain value, so that it may make
Field-effect transistor possesses turn-on condition.In addition its grid current requires the highest, so the power consumption on divider resistance also shows
Write and reduce.
Accompanying drawing explanation
Fig. 1 is the DC failure detector circuit schematic diagram in lamp control system described in the utility model.
Detailed description of the invention
For the technological means making this utility model realize, creation characteristic, reach purpose and act on more clear and be prone to
Understand, with detailed description of the invention, this utility model be further elaborated below in conjunction with the accompanying drawings:
In conjunction with Fig. 1, the utility model proposes the DC failure detector circuit in a kind of lamp control system, it includes that field is imitated
Answering transistor Q802, composition DC fault detect end DC-OK is outwards drawn in the drain electrode of described field-effect transistor Q802, and described field is imitated
The source ground of transistor Q802, the grid of described field-effect transistor Q802 is answered to be connected to by the first resistance R804, stabilivolt
ZD800 and the second partial pressure unit in series for resistance R802, first end of described first resistance R804 is from lamp control system
Output filter rectification unit obtain DC voltage V+, the first resistance R804 the second end be connected to the negative electrode of stabilivolt ZD800,
Described first end of the second resistance R802 is connected with the anode of stabilivolt ZD800, the second end ground connection of described second resistance R802,
The grid of described field-effect transistor Q802 is connected to the anode of stabilivolt ZD800.
In such scheme, described field-effect transistor Q802 preferentially uses N-channel field-effect transistor.This utility model sets
The DC failure detector circuit peripheral element of meter is few, and is set with stabilivolt by divider resistance R804, R802, can accurately detect DC
Voltage.When specifically detecting, DC fault detect end is detected by external microcontroller, now the drain electrode of field-effect transistor Q802
A test voltage is accessed by external pull-up resistor.Therefore, if the output rectification filter unit of lamp control system exports
Street lamp DC voltage in normal range of operation, then metal-oxide-semiconductor Q802 can turn on, and 3 feet i.e. drain output low level, the most defeated
Go out high level.When external microcontroller knows that this pin is low level, then judge that the direct current of lamp control system normally exports, when
External microcontroller is known when this pin is high level, then judge the direct current of lamp control system to fail normally and export.
As this utility model further technical scheme it is, between described stabilivolt ZD800 and the second resistance R802
Also it is parallel with the 3rd resistance R803, sees Fig. 1.3rd resistance R803 be connected in parallel on stabilivolt ZD800 and the second resistance R802 it
Between, primarily serve the effect of pressure limiting.
In order to enable DC failure detector circuit provided by the utility model to carry out light fixture control when low-power consumption
The direct current of system processed exports effectively, accurately detects, and the test of many times through inventor obtains, the parameter of above-mentioned each components and parts
Arrange and preferentially choose following value: the resistance size of described first resistance (R804) is 510K ohm, described second resistance
(R802) resistance size is 82K ohm, and the burning voltage of described stabilivolt (ZD800) is 3.6V.Described 3rd resistance
(R803) resistance size is 510K ohm.Wherein a kind of preferred embodiment is, at above-mentioned field-effect transistor
A stabilivolt also it is parallel with, as shown in Figure 1 between the drain-source pole of Q802.First this stabilivolt is to Q802 gate protection,
Secondly use such connection only to make just can turn on more than 25V, Q802 in D/C voltage, it is to avoid the erroneous judgement that low-voltage produces
Disconnected.
Finally illustrating, above example is only in order to illustrate the technical solution of the utility model and unrestricted, although ginseng
According to preferred embodiment, this utility model is described in detail, it will be understood by those within the art that, can be to this
The technical scheme of utility model is modified or equivalent, without deviating from objective and the model of technical solutions of the utility model
Enclosing, it all should be contained in the middle of right of the present utility model.
Claims (5)
1. the DC failure detector circuit in a lamp control system, it is characterised in that include field-effect transistor (Q802),
Composition DC fault detect end is outwards drawn in the drain electrode of described field-effect transistor (Q802),
The source ground of described field-effect transistor (Q802),
The grid of described field-effect transistor (Q802) is connected to by the first resistance (R804), stabilivolt (ZD800) and the second electricity
The partial pressure unit that resistance (R802) is in series, the first end of described first resistance (R804) filters from the output of lamp control system
Rectification unit obtains DC voltage, and the second end of described first resistance (R804) is connected to the negative electrode of stabilivolt (ZD800), described
First end of the second resistance (R802) is connected with the anode of stabilivolt (ZD800), the second termination of described second resistance (R802)
Ground, the grid of described field-effect transistor (Q802) is connected to the anode of stabilivolt (ZD800).
2. the DC failure detector circuit in lamp control system as claimed in claim 1, it is characterised in that described stabilivolt
(ZD800) the 3rd resistance (R803) also it is parallel with between and the second resistance (R802).
3. the DC failure detector circuit in lamp control system as claimed in claim 1 or 2, it is characterised in that described field is imitated
Transistor (Q802) is answered to use N-channel field-effect transistor.
4. the DC failure detector circuit in lamp control system as claimed in claim 3, it is characterised in that described first resistance
(R804) resistance size is 510K ohm, and the resistance size of described second resistance (R802) is 82K ohm, described stabilivolt
(ZD800) burning voltage is 3.6V.
5. the DC failure detector circuit in lamp control system as claimed in claim 2, it is characterised in that described 3rd resistance
(R803) resistance size is 510K ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620656204.5U CN205726622U (en) | 2016-06-28 | 2016-06-28 | DC failure detector circuit in lamp control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620656204.5U CN205726622U (en) | 2016-06-28 | 2016-06-28 | DC failure detector circuit in lamp control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205726622U true CN205726622U (en) | 2016-11-23 |
Family
ID=57317864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620656204.5U Active CN205726622U (en) | 2016-06-28 | 2016-06-28 | DC failure detector circuit in lamp control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205726622U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113365388A (en) * | 2021-03-18 | 2021-09-07 | 上海可大光电科技有限公司 | Lamp strip and lamp driven by constant-current power supply |
-
2016
- 2016-06-28 CN CN201620656204.5U patent/CN205726622U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113365388A (en) * | 2021-03-18 | 2021-09-07 | 上海可大光电科技有限公司 | Lamp strip and lamp driven by constant-current power supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170331 Address after: Hongqi Town Jinwan District golden grain road 519090 Guangdong province Zhuhai City No. 2, No. 1 building sixth room 602 Patentee after: Zhuhai Source Electronic Technology Co., Ltd. Address before: Jiang Xi Road 401336 Chongqing Nan'an District No. 11 No. 11-2 A2 second Patentee before: Chongqing Can Yuan Electronics Co., Ltd. |
|
| TR01 | Transfer of patent right |