CN209608901U - A kind of Triac switch detection circuit - Google Patents
A kind of Triac switch detection circuit Download PDFInfo
- Publication number
- CN209608901U CN209608901U CN201822095865.7U CN201822095865U CN209608901U CN 209608901 U CN209608901 U CN 209608901U CN 201822095865 U CN201822095865 U CN 201822095865U CN 209608901 U CN209608901 U CN 209608901U
- Authority
- CN
- China
- Prior art keywords
- triac
- detection circuit
- connects
- switch
- mos transistor
- 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.)
- Active
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Landscapes
- Rectifiers (AREA)
Abstract
The utility model discloses a kind of Triac switch detection circuits, it is characterised in that: including rectifier bridge, light emitting diode group, Triac switch keeping current path and LED current control circuit；The anode of rectifier bridge connection light emitting diode group；The anode connection Triac switch keeping current path of light emitting diode group, the cathode of light emitting diode group connect LED current control circuit；The output end of the LED current control circuit connects Triac switch keeping current path, and Triac switch keeping current path connects rectifier bridge；It further include TRIAC detection circuit and pulse width detection circuit.The utility model Triac switch detection circuit solves the detection whether lamps and lanterns are switched by access Triac, and according to testing result, the maintenance electric current of opening and closing Triac switch improves the efficiency of linear Triac LED driving.
Description
Technical field
The utility model relates to a kind of LED drive circuit, especially a kind of Triac switch detection circuit.
Background technique
Triac switch is the standard configuration of household light fixtures, but the LED lamp newly come out is not but to be adapted to very well, needs to answer
Miscellaneous driving circuit, early stage is realized with Switching Power Supply, and driving cost is very high；Linear Triac light modulation was developed later
Driving achievees the purpose that be adapted to Triac switch by way of increasing loss, this resulted in efficiency and be difficult substantially be more than
75%；The standard of the star of american energy is distinctly claimed, and the efficiency of lamps product has to be larger than 80%, and test environment is not connect
Triac switch, above-mentioned requirements are extremely difficult to traditional linear Triac light modulation product.
If Fig. 1 is traditional linear Triac LED drive circuit, linear Triac LED drive circuit includes rectifier bridge, hair
Optical diode group, the first amplifier OP1, the second amplifier OP2, power switch MOS transistor M1 and M2, output LED current sampling
Resistance RCS and Bleeder leakage current path sample resistance RBL；The input terminal of the rectifier bridge be separately connected power supply and
Triac switch；The output end connection light emitting diode group anode of rectifier bridge, the positive and negative anodes difference of light emitting diode group
The grid of the drain electrode of connection power switch MOS transistor M1 and M2, M1 and M2 are separately connected the first amplifier OP1 and the second amplifier
The source electrode of the output end of OP2, M1 and M2 connect and concatenate output one end LED current sampling resistor RCS, and the resistance RCS other end connects
Connect the output end of rectifier bridge；The reverse input end of first amplifier OP1 connects reference voltage VREF1, and the forward direction of the first amplifier OP1 is defeated
Enter end connection Bleeder current path sampling resistor RBL, resistance RBL connection sampling resistor RCS.
Specific works electric current as shown in Fig. 2, after system electrification, DCBUS voltage before not reaching LED voltage,
Bleeder access is opened, and is provided and is maintained electric current I1, and DCBUS voltage is V1, and V1 is steamed bun wave signal；When on DCBUS voltage V1
When being raised to LED voltage, M2 conducting provides LED conducting electric current I2, since VREF2 is greater than VREF1, so M1 is turned off, works as DCBUS
When voltage V1 drops to less than LED voltage, M2 can not be connected, and M1 is opened at this time, continue to provide maintenance electric current I1.
When being provided with Triac switch in the driving circuit of lamps and lanterns, there is the circuit for maintaining Triac switch to work normally, maintain
Circuit has certain loss；Due to that whether can not have Triac switch in detection circuit, holding circuit can be held always existing lamps and lanterns
It opens, causes unnecessary loss, so as to cause the low efficiency of lamps and lanterns；So the design of Triac switch detection circuit becomes especially
It is important.
Utility model content
The goal of the invention of the utility model is: in view of the above problems, providing a kind of Triac switch detection electricity
Road drives for linear Triac LED, can decide whether to open and guarantee by detecting whether lamps and lanterns access Triac switch
The maintenance current path that Triac switch works normally；If detecting lamps and lanterns by access Triac switch, pure loss is turned on
Maintenance current path directly closes if not being connected to Triac switch and maintains current path, greatly promotes LED driving
Efficiency.
The technical solution adopted in the utility model is as follows:
A kind of Triac switch detection circuit of the utility model, including rectifier bridge 100, light emitting diode group 200, Triac
Switch keeping current path 300 and LED current control circuit 400；The rectifier bridge 100, it is whole for carrying out all-wave to alternating current
Stream, and generate the anode of steamed bun wave signal V1, V1 connection light emitting diode group 200；The anode of light emitting diode group 200 is even
Triac switch keeping current path 300 is connect, the cathode of light emitting diode group 200 connects LED current control circuit 400；It is described
The output end of LED current control circuit 400 connects Triac switch keeping current path 300, Triac switch keeping current path
300 connection rectifier bridges 100；
It further include TRIAC detection circuit 500 and pulse width detection circuit 600；The TRIAC detection circuit 500 it is defeated
Enter IN is held to connect with V1, the output end OUT connection pulse width detection circuit 600 of TRIAC detection circuit 500, pulse width inspection
600 connection switch S1 of slowdown monitoring circuit, the one end switch S1 connect the output end of the first operational amplifier OP1；The TRIAC detection electricity
Road 500 generates square-wave signal by processing for detecting V1 signal；The pulse width detection circuit 600, for the side of detection
The low level pulse width of wave signal；
Wherein, when the low level pulse width of the square-wave signal of detection is less than preset value, closure switch S1；When the side of detection
The low level pulse width of wave signal is greater than preset value, and switch S1 keeps open circuit.
Preferably, the Triac switch keeping current path 300 includes the first operational amplifier OP1, power switch
MOS transistor M1, current path sampling resistor RBL and output LED current sampling resistor RCS are maintained；
The reverse input end of the first operational amplifier OP1 connects reference voltage VREF1, and noninverting input connection maintains
The one end current path sampling resistor RBL, output end connect the grid of power switch MOS transistor M1；
The drain electrode of the power switch MOS transistor M1 connects V1, and source electrode connects LED current control circuit 400；
The maintenance current path sampling resistor RBL other end connection LED current control circuit 400 and output LED current
The one end sampling resistor RCS；
The output LED current sampling resistor RCS other end connects rectifier bridge 100.
Preferably, the LED current control circuit 400 includes second operational amplifier OP2 and power switch MOS brilliant
Body pipe M2；
The noninverting input of the second operational amplifier OP2 connects reference voltage VREF2, and reverse input end connects power
The source electrode of switch mos transistor M2, output end connect the grid of power switch MOS transistor M2；
The drain electrode of the power switch MOS transistor M2 connects 200 cathode of light emitting diode group, and source electrode connects Triac
Switch keeping current path 300.
Preferably, the TRIAC detection circuit 500 includes power switch MOS transistor M3 and power switch MOS brilliant
Body pipe M4, reference voltage VREG, comparator COMP1；
The drain electrode of the power switch MOS transistor M3 connects input voltage, grounded-grid, and source electrode is separately connected benchmark electricity
Press the drain electrode of the JFETS pin and power switch MOS transistor M4 of VREG；
The VDD pin of the grid connection reference voltage VREG of the power switch MOS transistor M4, source electrode connect comparator
The INP pin of COMP1；The output end output voltage of the comparator COMP1.
Preferably, the TRIAC detection circuit includes comparator COMP2, resistance R1 and resistance R2；The resistance R1 mono-
End connection input voltage, the resistance R1 other end are separately connected the one end resistance R2 and the INP pin of comparator COMP2, and resistance R2 is another
One end ground connection, the output end output voltage of comparator COMP2.
In conclusion by adopting the above-described technical solution, the beneficial effects of the utility model are:
1, whether there is Triac switch, by the way that TRIAC detection circuit and pulse width are arranged in circuit in detection circuit
The steamed bun wave signal that rectifier bridge exports is converted into square-wave signal by detection circuit, TRIAC detection circuit, is examined further according to pulse width
Slowdown monitoring circuit detects the pulse width of square-wave signal, whether has Triac switch according in the pulse width decision circuitry of detection.
2, the linear LED drive circuit of the utility model application is high-efficient, due to being examined by Triac switch detection circuit
Whether in circuit have Triac switch, when detecting in circuit do not have Triac switch, close holding circuit, reduce circuit if measuring
Loss, improves the efficiency of circuit.
Detailed description of the invention
Fig. 1 is conventional linear Triac LED drive circuit figure.
Fig. 2 is the control waveform diagram of conventional linear Triac LED drive circuit.
Fig. 3 is a kind of Triac switch detection circuit figure of the present invention.
Fig. 4 is the timing diagram of TRIAC detection circuit input signal and output signal.
Fig. 5 is one of embodiment TRIAC detection circuit figure.
Fig. 6 is another TRIAC detection circuit figure in embodiment.
Marked in the figure: 100 be rectifier bridge, 200 be light emitting diode group, and 300 be Triac switch keeping current path,
400 be LED current control circuit, and 500 be TRIAC detection circuit, and 600 be pulse width detection circuit.
Specific embodiment
With reference to the accompanying drawing, the utility model is described in detail.
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only to explain this
Utility model is not used to limit the utility model.
As shown in figure 3, a kind of Triac switch detection circuit of the utility model, including rectifier bridge 100, light-emitting diodes nest of tubes
Group 200, Triac switch keeping current path 300 and LED current control circuit 400；The rectifier bridge 100, for alternating current
Full-wave rectification is carried out, and generates the anode of steamed bun wave signal V1, V1 connection light emitting diode group 200；Light emitting diode group
200 anode connection Triac switch keeping current path 300, the cathode of light emitting diode group 200 connect LED current control
Circuit 400；The output end of the LED current control circuit 400 connects Triac switch keeping current path 300, Triac switch
Current path 300 is maintained to connect rectifier bridge 100；
It further include TRIAC detection circuit 500 and pulse width detection circuit 600；The TRIAC detection circuit 500 it is defeated
Enter IN is held to connect with V1, the output end OUT connection pulse width detection circuit 600 of TRIAC detection circuit 500, pulse width inspection
600 connection switch S1 of slowdown monitoring circuit, the one end switch S1 connect the output end of the first operational amplifier OP1.
In embodiment, the Triac switch keeping current path 300 includes the first operational amplifier OP1, power switch
MOS transistor M1, current path sampling resistor RBL and output LED current sampling resistor RCS are maintained；First operation amplifier
The reverse input end of device OP1 connects reference voltage VREF1, and noninverting input connection maintains current path sampling resistor RBL mono-
End, output end connect the grid of power switch MOS transistor M1；The drain electrode of the power switch MOS transistor M1 connects V1,
Source electrode connects LED current control circuit 400；The maintenance current path sampling resistor RBL other end connection LED current control electricity
Road 400 and output one end LED current sampling resistor RCS；The output LED current sampling resistor RCS other end connects rectifier bridge
100。
In embodiment, the LED current control circuit 400 includes second operational amplifier OP2 and power switch MOS
Transistor M2；The noninverting input of the second operational amplifier OP2 connects reference voltage VREF2, and reverse input end connects function
The source electrode of rate switch mos transistor M2, output end connect the grid of power switch MOS transistor M2；The power switch MOS
The drain electrode of transistor M2 connects 200 cathode of light emitting diode group, and source electrode connects Triac switch keeping current path 300.
As shown in figure 4, the TRIAC detection circuit 500 generates square-wave signal by processing for detecting V1 signal；
The input TRIAC_DET_IN signal of TRIAC detection circuit 500 is steamed bun wave signal, by turning for TRIAC detection circuit 500
It changes, generates square-wave signal TRIAC_DET_OUT；In the present invention, there is no limit specific shapes for the TRIAC detection circuit 500
Formula can achieve the effect that technical solution as long as steamed bun wave signal can be converted into the circuit of square-wave signal；Following discloses
Two kinds of TRIAC detection circuits:
In one embodiment, a kind of TRIAC detection circuit is disclosed, the TRIAC detection circuit 500 is opened including power
Close MOS transistor M3 and power switch MOS transistor M4, reference voltage VREG, comparator COMP1；The power switch MOS
The drain electrode of transistor M3 connects input voltage, grounded-grid, and source electrode is separately connected the JFETS pin and function of reference voltage VREG
The drain electrode of rate switch mos transistor M4；The VDD of the grid connection reference voltage VREG of the power switch MOS transistor M4 draws
Foot, source electrode connect the INP pin of comparator COMP1；The output end output voltage of the comparator COMP1.
In another embodiment, a kind of TRIAC detection circuit is also disclosed, the TRIAC detection circuit includes comparing
Device COMP2, resistance R1 and resistance R2；The one end the resistance R1 connects input voltage, and the resistance R1 other end is separately connected resistance R2
The INP pin of one end and comparator COMP2, resistance R2 other end ground connection, the output end output voltage of comparator COMP2.
Since in the circuit that no Triac is switched, the low level pulse width Tdis of square-wave signal is far smaller than set
Value；And in the circuit for thering is Triac to switch, the low level pulse width Tdis of square-wave signal is far longer than setting value；Setting value
Representative value be 400uS, but other values can also be chosen, the numerical value in 100US to 600uS range is all feasible；So logical
Setting pulse width detection circuit 600 is crossed, for detecting the low level pulse width of square-wave signal；Work as pulse width detection circuit
Detect that the width Tdis of low level pulse is less than 400uS, then it is confirmed that switched without Triac, output signal closure switch S1,
The M1 of Triac switch keeping current path 300 is turned off, and electric current is maintained to disconnect；When pulse width detection circuit detect it is low
Level pulse widths Tdis is greater than 400uS, then it is confirmed that there is Triac switch, switch S1 keeps open circuit, and M1 is worked normally；It is logical
It crosses in detection LED drive circuit and whether accesses Triac switch, and decide whether to open the dimension for guaranteeing that Triac switch works normally
Current path is held, if not being connected to Triac switch, directly closes and maintains current path, greatly raising efficiency.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the utility model within the spirit and principle of utility model
Protection scope within.
Claims (5)
1. a kind of Triac switch detection circuit, it is characterised in that: including rectifier bridge (100), light emitting diode group (200),
Triac switch keeping current path (300) and LED current control circuit (400)；The rectifier bridge (100), for alternating current
Full-wave rectification is carried out, and generates the anode of steamed bun wave signal V1, V1 connection light emitting diode group (200)；Light-emitting diodes nest of tubes
The cathode of anode connection Triac switch keeping current path (300) of group (200), light emitting diode group (200) connects LED
Current control circuit (400)；The output end of the LED current control circuit (400) connects Triac switch keeping current path
(300), Triac switch keeping current path (300) connection rectifier bridge (100)；
It further include TRIAC detection circuit (500) and pulse width detection circuit (600)；
The input terminal (IN) of the TRIAC detection circuit (500) is connect with V1, the output end of TRIAC detection circuit (500)
(OUT) pulse width detection circuit (600) are connected, pulse width detection circuit (600) connection switch (S1) switchs the one end (S1)
Connect the output end of the first operational amplifier (OP1)；The TRIAC detection circuit (500), for detecting V1 signal, by place
Reason generates square-wave signal；The pulse width detection circuit (600), for detecting the low level pulse width of square-wave signal；
Wherein, when the low level pulse width of the square-wave signal of detection is less than preset value, closure switch (S1)；When the square wave of detection
The low level pulse width of signal is greater than preset value, and switch (S1) keeps open circuit.
2. Triac switch detection circuit as described in claim 1, it is characterised in that: the Triac switch keeping current path
(300) include the first operational amplifier (OP1), power switch MOS transistor (M1), maintain current path sampling resistor (RBL)
With output LED current sampling resistor (RCS)；
The reverse input end of first operational amplifier (OP1) connects reference voltage (VREF1), and noninverting input connection maintains
The one end current path sampling resistor (RBL), output end connect the grid of power switch MOS transistor (M1)；
The drain electrode of the power switch MOS transistor (M1) connects V1, and source electrode connects LED current control circuit (400)；
Maintenance current path sampling resistor (RBL) other end connection LED current control circuit (400) and output LED current
The one end sampling resistor (RCS)；
Output LED current sampling resistor (RCS) other end connects rectifier bridge (100).
3. Triac switch detection circuit as described in claim 1, it is characterised in that: the LED current control circuit (400)
Including second operational amplifier (OP2) and power switch MOS transistor (M2)；
The noninverting input of the second operational amplifier (OP2) connects reference voltage (VREF2), and reverse input end connects power
The source electrode of switch mos transistor (M2), output end connect the grid of power switch MOS transistor (M2)；
The drain electrode of the power switch MOS transistor (M2) connects light emitting diode group (200) cathode, and source electrode connects Triac
Switch keeping current path (300).
4. the Triac switch detection circuit as described in claims 1 or 2 or 3, it is characterised in that: the TRIAC detection circuit
It (500) include power switch MOS transistor (M3) and power switch MOS transistor (M4), reference voltage (VREG), comparator
(COMP1)；
The drain electrode of the power switch MOS transistor (M3) connects input voltage, grounded-grid, and source electrode is separately connected reference voltage
(VREG) drain electrode of JFETS pin and power switch MOS transistor (M4)；
The VDD pin of grid connection reference voltage (VREG) of the power switch MOS transistor (M4), source electrode connect comparator
(COMP1) INP pin；The output end output voltage of the comparator (COMP1).
5. the Triac switch detection circuit as described in claims 1 or 2 or 3, it is characterised in that: the TRIAC detection circuit packet
Include comparator (COMP2), resistance (R1) and resistance (R2)；
Described resistance one end (R1) connects input voltage, and resistance (R1) other end is separately connected resistance one end (R2) and comparator
(COMP2) INP pin, resistance (R2) other end ground connection, the output end output voltage of comparator (COMP2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822095865.7U CN209608901U (en) | 2018-12-14 | 2018-12-14 | A kind of Triac switch detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822095865.7U CN209608901U (en) | 2018-12-14 | 2018-12-14 | A kind of Triac switch detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209608901U true CN209608901U (en) | 2019-11-08 |
Family
ID=68395838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822095865.7U Active CN209608901U (en) | 2018-12-14 | 2018-12-14 | A kind of Triac switch detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209608901U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109640441A (en) * | 2018-12-14 | 2019-04-16 | 普诚创智（成都）科技有限公司 | A kind of Triac switch detection circuit |
-
2018
- 2018-12-14 CN CN201822095865.7U patent/CN209608901U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109640441A (en) * | 2018-12-14 | 2019-04-16 | 普诚创智（成都）科技有限公司 | A kind of Triac switch detection circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107046751B (en) | A kind of linear constant current LED drive circuit, driving chip and driving device | |
| CN106793246A (en) | Leadage circuit and its control method and LED control circuit | |
| CN103929855B (en) | LED lighting device, LED driving circuit and switch power source driving chip of LED driving circuit | |
| CN104918392B (en) | System for providing from output current to one or more light emitting diodes | |
| CN206181442U (en) | Bleeder circuit and LED control circuit | |
| CN208863094U (en) | A kind of Dimmable LED driving circuit | |
| CN105722272B (en) | A kind of constant pressure dimming power source starting voltage adaptive approach | |
| US20140333205A1 (en) | Stabilization circuit for low-voltage lighting | |
| WO2018024038A1 (en) | Ripple current generation circuit | |
| CN106954313B (en) | A kind of LED linear constant-current drive circuit of adaptive network voltage | |
| CN108541107A (en) | A kind of lighting load abnormal detector and corresponding lighting system | |
| CN209608901U (en) | A kind of Triac switch detection circuit | |
| CN206181454U (en) | Bleeder circuit and LED control circuit | |
| CN202799281U (en) | Control device for small LED strings | |
| CN106714367A (en) | Constant current circuit and constant current controller thereof | |
| CN100554974C (en) | The method and apparatus that semiconductor subassembly and Drive and Control Circuit thereof are detected | |
| CN208508899U (en) | A kind of inexpensive IGBT switch controlled circuit of high reliability | |
| CN109975645B (en) | Optical isolation wide voltage range electric leakage monitoring alarm module | |
| CN203761661U (en) | LED light-emitting apparatus, LED drive circuit, and switching power supply drive chip of LED drive circuit | |
| CN206602702U (en) | Electric ballast and UV lamp | |
| CN109640441A (en) | A kind of Triac switch detection circuit | |
| CN203435180U (en) | Low-cost LED lamp self-adaptive dimming control circuit | |
| CN208317072U (en) | A kind of PWM dimming device and its short-circuit protection circuit | |
| CN209314130U (en) | A kind of four tape fire-fighting infrared induction lamp drive circuits | |
| CN203413914U (en) | Door opening and closing detection circuit for refrigerator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |