CN205812474U - A kind of pressing type dimmer of band over-current detection - Google Patents
A kind of pressing type dimmer of band over-current detection Download PDFInfo
- Publication number
- CN205812474U CN205812474U CN201620629526.0U CN201620629526U CN205812474U CN 205812474 U CN205812474 U CN 205812474U CN 201620629526 U CN201620629526 U CN 201620629526U CN 205812474 U CN205812474 U CN 205812474U
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- circuit
- mcu
- field effect
- current detection
- effect transistor
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Abstract
This utility model relates to the pressing type dimmer of a kind of band over-current detection; the load including push switch and being attached thereto and light adjusting circuit, light adjusting circuit includes that half-wave rectifying circuit, low dropout voltage regulator, current foldback circuit, MCU process circuit, PMW controls on-off circuit and overload protecting circuit；The input of half-wave rectifying circuit is connected with civil power；The outfan of half-wave rectifying circuit produces DC source by low dropout voltage regulator and connects MCU process circuit；MCU processes the outfan of circuit and connects PMW control on-off circuit；Overload protecting circuit is connected to load and PMW controls between on-off circuit and process circuit with MCU to be connected；The input of current foldback circuit connects civil power and low dropout voltage regulator respectively；The outfan of current foldback circuit connects MCU respectively and processes circuit and PMW control on-off circuit.This utility model circuit structure is simple, and precision is high, and action is fast, compares safety, and reliability is high.
Description
Technical field
This utility model relates to a kind of dimmer, the pressing type dimmer of a kind of band over-current detection.
Background technology
Dimmer is applied widely at Intelligent House Light, and present people are more and more higher to the pursuit of quality of the life, adjusts
Light device can be with the light levels of light regulating, according to individual Man's Demands, can the luminous intensity of lamp be transferred to that individual likes bright
Degree, allows and oneself feels more comfortable.
For dimmer, if bearing power is excessive, then the biggest by the electric current of power device so that power device
Part heating ratio is more serious.Owing to dimmer is typically mounted in wall socket, therefore heat dispersal situations is less desirable, and heat can not
Well distributing, because temperature is too high, so can cause dimmer moulds shell deformation, more seriously, can cause fire,
Huge economic loss is brought to consumer.
The scheme taked for this problem in the market is to arrange current foldback circuit in the dimmer itself in order, concrete
Current foldback circuit has:
A: Thermal Cutoffs；Shortcoming: after overcurrent protection, it is impossible to recover voluntarily.
B:PTC (critesistor of positive temperature coefficient)；Shortcoming: when PTC themistor starts in high-impedance state, it is necessary to hold
By most supply voltage, when therefore selecting PTC themistor, to there is sufficiently high maximum working voltage, also simultaneously
The issuable fluctuation of supply voltage to be considered.In addition, it is necessary to consider the restriction of PTC maximum current, if it exceeds PTC is
Big electric current, PTC can be damaged.PTC over-current detection precision is the highest, and the action current of PTC can not accurately judge
C: carry out over-current detection as shown in Figure 1 with comparator circuit.Part I is resistance sampling, and load and R2 connect,
Voltage on R2 changes along with the curent change of load, and electric current is big, and R2 both end voltage is the highest, R3, D1 composition amplifier protection electricity
Road, prevents too high voltage from entering amplifier and causes amplifier to be damaged, and C1 prevents from disturbing use.Part II in-phase amplifier, by
The least in the signal of the resistance sampling of prime, amplify with amplifying circuit.Part III is a comparator circuit, and amplifier is taking
The signal of sample amplifies, and compares through this level, thus goes to control the action of rear class, if cut off the electricity supply or other operation, comparator
It is open circuit output, so to add upper resistance, not so cannot export high level；Shortcoming: precision is the highest, it is easy to be interfered；Device
Part is many.
Utility model content
The technical problems to be solved in the utility model is: provides the pressing type dimmer of a kind of band over-current detection, has knot
Structure is simple, precision high.
This utility model solves its technical problem and be the technical scheme is that the pressing type light modulation of a kind of band over-current detection
Device, the load including push switch and being attached thereto and light adjusting circuit, described light adjusting circuit includes halfwave rectifier electricity
Road, low dropout voltage regulator, current foldback circuit, MCU process circuit, PMW control on-off circuit and overload protecting circuit；Institute
The input of the half-wave rectifying circuit stated is connected with civil power；The outfan of half-wave rectifying circuit is produced by low dropout voltage regulator
Raw DC source connects MCU and processes circuit；Described MCU processes the outfan of circuit and connects PMW control on-off circuit；Described
Overload protecting circuit is connected to load and PMW controls between on-off circuit and process circuit with MCU to be connected；
The input of described current foldback circuit connects civil power and low dropout voltage regulator respectively；Current foldback circuit
Outfan connect MCU respectively and process circuit and PMW and control on-off circuit.
Further, current foldback circuit described in the utility model includes the first field effect transistor and the second field effect
Pipe；Connect between the first described field effect transistor and the second field effect transistor and have the first resistance；The first described field effect transistor connects
There are the second resistance, diode and audion；When crossing stream, the base stage of described audion obtains the first ohmically voltage and leads
Logical；The gate drive voltage making the first field effect transistor and the second field effect transistor reduces and closes.
Further saying, in order to improve precision, the resistance of the first resistance described in the utility model is 75 milliohms.
Further, when the base stage of audion described in the utility model obtains the first ohmically voltage more than 1.1V
Conducting.
Further, MCU described in the utility model processes circuit and receives the signal control PMW control produced by compressing switch
The dutycycle of on-off circuit processed.Thus regulate the ON time of power tube, thus complete the process of pressing type light modulation.
The beneficial effects of the utility model are: circuit structure is simple, and precision is high, and action is fast, compare safety, and reliability is high.
Accompanying drawing explanation
With embodiment, this utility model is further illustrated below in conjunction with the accompanying drawings.
Fig. 1 is the circuit theory diagrams of prior art；
Fig. 2 is structured flowchart of the present utility model；
Fig. 3 is the schematic diagram of this utility model over-current detection circuit.
Detailed description of the invention
Presently in connection with accompanying drawing and preferred embodiment, this utility model is described in further detail.These accompanying drawings are letter
The schematic diagram changed, illustrates basic structure of the present utility model the most in a schematic way, and therefore it only shows relevant with this utility model
Composition.
As it is shown in figure 1, prior art uses comparator circuit to carry out over-current detection, background technology is explained,
Narration is not repeated herein.
The pressing type dimmer of a kind of band over-current detection as shown in Figure 2, including push switch and be attached thereto
Load and light adjusting circuit, light adjusting circuit includes half-wave rectifying circuit, low dropout voltage regulator, current foldback circuit, MCU process
Circuit, PMW control on-off circuit and overload protecting circuit；The input of half-wave rectifying circuit is connected with civil power；Half-wave is whole
The outfan of current circuit produces DC source by low dropout voltage regulator and connects MCU process circuit；Described MCU processes circuit
Outfan connect PMW control on-off circuit；Described overload protecting circuit is connected to load and PMW controls between on-off circuit
And be connected with MCU process circuit；The input of current foldback circuit connects civil power and low dropout voltage regulator respectively；Cross stream to protect
The outfan of protection circuit connects MCU respectively and processes circuit and PMW control on-off circuit.
Pressing type dimmer operation principle, civil power produces unidirectional current through halfwave rectifier and LDO (low dropout voltage regulator)
Source powers to MCU, and MCU is according to by the signal produced that compresses switch simultaneously, controls the dutycycle of PWM (pulse width modulation), regulation
The ON time of power tube, thus complete the process of pressing type light modulation.
Current foldback circuit is as it is shown on figure 3, connect R5 between Q1 and Q3；One end ground connection of R5；R5 resistance is 75 milliohms；D1
In parallel with R5 with after D2 series connection；The grounded emitter of audion Q6, is connected between the colelctor electrode of Q6 and Q1 and has R8 and D4；The base of Q6
Pole is sequentially connected with ground connection after the resistance R21 of a 10K, audion Q4 and R20；The colelctor electrode of Q4 connects R14 and D4 respectively；
The operation principle of overcurrent protection is: use high-precision resistance R5, and resistance is 75 milliohms, when power device being detected
When flowing through big electric current in Q1 and Q3, the voltage on resistance R5 increases, i.e. the base voltage of audion Q6 increases, as the V of Q6beGreatly
When 1.1V, so that audion Q6 conducting, branch road R8, D4, Q6 turn on over the ground, as shown in Fig. 3 direction of arrow.Can be direct
The gate drive voltage of power device Q1 (IPB60R190C6) and Q3 (IPB60R190C6) is reduced, so that power device
Q1 and Q3 closes.Electric current is turned off, so that load (light fixture) is extinguished, reaches the purpose of over-current detection, protects pressing type
Dimmer.
Simply detailed description of the invention of the present utility model described in description above, various illustrations are not to this practicality
Novel flesh and blood is construed as limiting, person of an ordinary skill in the technical field after having read description can to before institute
The detailed description of the invention stated is made an amendment or deforms, without departing from the spirit and scope of utility model.
Claims (5)
1. a pressing type dimmer for band over-current detection, the load including push switch and being attached thereto and light modulation electricity
Road, it is characterised in that: described light adjusting circuit includes half-wave rectifying circuit, low dropout voltage regulator, current foldback circuit, MCU
Process circuit, PMW controls on-off circuit and overload protecting circuit；The input of described half-wave rectifying circuit is electrically connected with city
Connect；The outfan of half-wave rectifying circuit produces DC source by low dropout voltage regulator and connects MCU process circuit；Described
MCU processes the outfan of circuit and connects PMW control on-off circuit；Described overload protecting circuit is connected to load and PMW controls
Between on-off circuit and process circuit with MCU to be connected；
The input of described current foldback circuit connects civil power and low dropout voltage regulator respectively；Current foldback circuit defeated
Go out end and connect MCU process circuit and PMW control on-off circuit respectively.
The pressing type dimmer of a kind of band over-current detection the most as claimed in claim 1, it is characterised in that: described overcurrent protection
Circuit includes the first field effect transistor and the second field effect transistor；Connect between the first described field effect transistor and the second field effect transistor and have
First resistance；The first described field effect transistor connects the second resistance, diode and audion；When crossing stream, three described poles
The base stage of pipe obtains the first ohmically voltage and turns on；Make the raster data model electricity of the first field effect transistor and the second field effect transistor
Pressure drop is low and closes.
The pressing type dimmer of a kind of band over-current detection the most as claimed in claim 2, it is characterised in that: the first described resistance
Resistance be 75 milliohms.
The pressing type dimmer of a kind of band over-current detection the most as claimed in claim 2, it is characterised in that: described audion
Base stage obtains the first ohmically voltage more than conducting during 1.1V.
The pressing type dimmer of a kind of band over-current detection the most as claimed in claim 1, it is characterised in that: described MCU process
Circuit receives the signal produced by compressing switch and controls the dutycycle of PMW control on-off circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620629526.0U CN205812474U (en) | 2016-06-23 | 2016-06-23 | A kind of pressing type dimmer of band over-current detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620629526.0U CN205812474U (en) | 2016-06-23 | 2016-06-23 | A kind of pressing type dimmer of band over-current detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205812474U true CN205812474U (en) | 2016-12-14 |
Family
ID=57506125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620629526.0U Expired - Fee Related CN205812474U (en) | 2016-06-23 | 2016-06-23 | A kind of pressing type dimmer of band over-current detection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205812474U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106132041A (en) * | 2016-06-23 | 2016-11-16 | 英特曼电工（常州）有限公司 | Pressing type dimmer with over-current detection |
| CN107027225A (en) * | 2017-06-15 | 2017-08-08 | 乐健科技（珠海）有限公司 | LED light adjusting circuits and LED modules, the light-dimming method of LED modules |
-
2016
- 2016-06-23 CN CN201620629526.0U patent/CN205812474U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106132041A (en) * | 2016-06-23 | 2016-11-16 | 英特曼电工（常州）有限公司 | Pressing type dimmer with over-current detection |
| CN106132041B (en) * | 2016-06-23 | 2019-01-01 | 英特曼电工（常州）有限公司 | Push type light modulator with over-current detection |
| CN107027225A (en) * | 2017-06-15 | 2017-08-08 | 乐健科技（珠海）有限公司 | LED light adjusting circuits and LED modules, the light-dimming method of LED modules |
| CN107027225B (en) * | 2017-06-15 | 2019-01-29 | 乐健科技（珠海）有限公司 | The light-dimming method of LED light adjusting circuit and LED module, LED module |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161214 Termination date: 20210623 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |