CN105813260A - Secondary linear back cutting regulator and regulation method - Google Patents
Secondary linear back cutting regulator and regulation method Download PDFInfo
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- CN105813260A CN105813260A CN201610206302.3A CN201610206302A CN105813260A CN 105813260 A CN105813260 A CN 105813260A CN 201610206302 A CN201610206302 A CN 201610206302A CN 105813260 A CN105813260 A CN 105813260A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- 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]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
- Electronic Switches (AREA)
Abstract
The invention provides a secondary linear back cutting regulator and a regulation method. The secondary linear back cutting regulator comprises an alternating current switch circuit, a zero-cross detection circuit, a driving control circuit and a power supply circuit, wherein the alternating current switch circuit is connected with a load loop in series; the zero-cross detection circuit detects the alternating current input current; when the input current crosses the zero point, a zero-cross signal is output; the driving control circuit is connected with the alternating current switch circuit and the zero-cross detection circuit; within one input current period, when the driving control circuit receives the zero-cross signal, the driving control circuit drives the alternating current switch circuit to be conducted; the load is connected to the circuit; after a certain time delay, the driving control circuit outputs the signal to cut off the alternating current switch, wherein the time delay for a certain time refers to a time section less than or equal to the half period of the input current; and the power supply circuit is connected with the alternating current switch circuit, the zero-cross detection circuit and the driving control circuit separately.
Description
Technical field
The present invention relates to LED control field, and particularly to a kind of two line style rear cutout actuator and control methods.
Background technology
The present dimmer overwhelming majority adopts controllable silicon to dim, and is called controllable silicon dimmer.Controllable silicon dimmer be a kind of front cut actuator its to traditional resistive load, be completely compatible such as electric filament lamp etc. and there is good dimming effect.But, along with the universal of LED light source and development, and the eliminating of electric filament lamp, the ligthing paraphernalia of the high-luminous-efficiencies such as the substantial amounts of Novel light modulator of market demand regulates substantial amounts of LED, electricity-saving lamp.
Traditional controllable silicon dimmer is a kind of Delayed conducting, the device of zero-crossing switching, and namely when controlled silicon conducting, input voltage is relatively big, and the electric current in load is bigger.For the low-voltage devices such as LED, the electric current of bigger load is easy to make load damage and cause the accident.Further, controllable silicon itself only has the function of firing current, it does not have complete switch off the ability of electric current.And the light fixtures such as LED itself have a lowest starting voltage value, when input voltage starts under magnitude of voltage at it time, lamp will extinguish, and light fixture will be show high-impedance state.As long as at this time light fixture there being very small penetrating current to pass through, it will be made slowly to increase and to reach to start magnitude of voltage, lamp know again after arising that a sudden strain of a muscle go out low frequency, low-light level phosphere, be called threshold values phosphere.
Summary of the invention
The present invention easily makes load damage or threshold value phosphere occur to overcome existing LED dimmer, it is provided that a kind of passing zero trigger, two line style rear cutout actuator and control methods of time delayed turn-off.
To achieve these goals, the present invention provides a kind of two line style rear cutout actuators, including alternating current switching circuit, zero cross detection circuit, driving control circuit and power supply circuits.Alternating current switching circuit is connected with load circuit.The input current of zero cross detection circuit detection exchange, exports zero cross signal when input current zero crossing.Control circuit is driven to connect alternating current switching circuit and zero cross detection circuit respectively, within an input current cycle, alternating current switching circuit conducting is driven when driving control circuit to receive zero cross signal, in load access circuit, time delay a period of time rear drive control circuit output signal makes alternating current switching circuit end, and a period of time is less than or equal to the half period of input current.Power supply circuits connect alternating current switching circuit, zero cross detection circuit and driving control circuit respectively.
In one embodiment of the invention, alternating current switching circuit is made up of two VMOS pipe differential concatenations, and the control of two VMOS pipes is extremely all connected with driving control circuit.
In one embodiment of the invention, two line style rear cutout actuators also include being connected to circuit input end and driving the potentiometer between control circuit, and the resistance on potentiometer determines the length of delay time.
In one embodiment of the invention, control circuit is driven to include comparison control circuit, PWM generator circuit and drive circuit, comparison control circuit connects potentiometer and zero cross detection circuit, and comparison control circuit controls the dutycycle of PWM generator circuit according to the resistance exported on signal and potentiometer of zero cross detection circuit.
In one embodiment of the invention, potentiometer is key switch potentiometer.
In one embodiment of the invention, two line style rear cutout actuators also include minimum spacing regulator potentiometer, and minimum spacing regulator potentiometer connects driving control circuit, and minimum spacing regulator potentiometer determines the shortest time of time delay.
In one embodiment of the invention, alternating current switching circuit and driving control circuit are formed on aluminum base circuit board.
In one embodiment of the invention, power supply circuits are connected in parallel on the two ends of alternating current switching circuit, and within the deadline of alternating current switching circuit, power supply circuits obtain input voltage and form unidirectional current output after AC-DC changes.
In one embodiment of the invention, input voltage range for 220V～240V, frequency is 50Hz.
Another aspect of the present invention also provides for a kind of two line style rear cutout control methods, including: the input current of detection exchange, zero cross signal is exported when input current zero crossing；Within an input current cycle, control circuit is driven to receive zero cross signal and drive alternating current switching circuit to turn on, in load access circuit；After time delay a period of time, driving control circuit output signal to make alternating current switching circuit end, a period of time is less than or equal to the half period of input current.
In sum, two line style rear cutout actuators provided by the invention and control method compared with prior art, have the advantage that
Detect AC input current by arranging zero cross detection circuit, drive when AC input current zero crossing control circuit to drive the alternating current switching circuit conducting connected with load circuit, it is achieved passing zero trigger.Conducting time delay a period of time rear drive control circuit drives alternating current switching circuit cut-off, and the length of delay time, by determining the output power to load, namely determines the luminous flux (or illumination brightness) of load, reaches the purpose of light modulation.Traditional controllable silicon dimmer compared by two line style rear cutout actuators provided by the invention, it turns on when input current zero crossing, now exports to the current value of load less, load will not be produced bigger impact, the proof load performance safety when starting is stable, load long service life.Further, comparing traditional controllable silicon dimmer, the cut-off of alternating current switching circuit can realize complete switching off of load current, effectively prevent the generation of LED lamp threshold value phosphere.
For above and other objects of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and coordinate accompanying drawing, it is described in detail below.
Accompanying drawing explanation
Fig. 1 show the circuit theory diagrams of the two line style rear cutout actuators that one embodiment of the invention provides.
Fig. 2 show in two line style rear cutout actuators shown in Fig. 1 the sequential chart of input voltage waveform and output voltage waveforms.
Detailed description of the invention
Traditional controllable silicon dimmer is due to its Delayed conducting, the characteristic of zero-crossing switching so that it has bigger firing current when conducting in load.For low-voltage devices such as LED lamp, LED lamp can be impacted by the larger current that controllable silicon produces when conducting so that it is is damaged.Additionally, due to cannot realize complete switching off of electric current during controllable silicon cut-off, this characteristic will make the LED lamp with low start voltage the problem that threshold value is glistened occur.In view of this, applicant provides a kind of passing zero trigger, time delayed turn-off after long-time research, and can complete switch off two line style rear cutout actuator and control methods of load current when off.
Fig. 1 show the circuit theory diagrams of the two line style rear cutout actuators that one embodiment of the invention provides.Fig. 2 show in two line style rear cutout actuators shown in Fig. 1 the sequential chart of input voltage waveform and output voltage waveforms.See also Fig. 1 and Fig. 2.L-IN is electric power incoming line in FIG, and L-OUT is power outlet, and N is zero-power line.In fig. 2, UL is the ac voltage signal of input, and Ulout is the output voltage signal after two line style rear cutout devices.
As it is shown in figure 1, the two line style rear cutout actuators that the present embodiment provides include alternating current switching circuit 1, zero cross detection circuit 2, drive control circuit 3 and power supply circuits 4.Alternating current switching circuit 1 is connected with load circuit.The input current of zero cross detection circuit 2 detection exchange, exports zero cross signal when input current zero crossing.Control circuit 3 is driven to connect alternating current switching circuit 1 and zero cross detection circuit 2 respectively, within an input current cycle, drive alternating current switching circuit 1 to turn on when driving control circuit 3 to receive zero cross signal, in load R access circuit, time delay a period of time rear drive control circuit 3 exports signal makes alternating current switching circuit 1 end, and a period of time is less than or equal to the half period of input current.Power supply circuits 4 connect alternating current switching circuit 1, zero cross detection circuit 2 respectively and drive control circuit 3.
The concrete structure of zero cross detection circuit 2 is not limited in any way by the present invention.As long as any available circuit that can realize zero crossing detection function is used equally to the present invention.In the present embodiment, input voltage range for 220V～240V, frequency is 50Hz.But, this is not limited in any way by the present invention.
In the two line style rear cutout actuators that the present embodiment provides, detecting input current by zero cross detection circuit 2, when input current zero crossing, alternating current switching circuit 1 turns on.Now input current value is less, and the electric current namely flowing through load R is less, will not load R be impacted, load can clean boot, there is good security performance.Alternating current switching circuit 1 will end after turning on time delay a period of time, and in actual use, user can use environments to arrange different delay times according to the difference of load R.In the present embodiment, load R is LED lamp.But, this is not limited in any way by the present invention.In other embodiments, two line style rear cutout actuators provided by the invention can be equally used for regulating the products such as electric fan (needing the components and parts that configuration is corresponding, not narration in this example).
Specifically, when ambient light is brighter, for reaching energy-conservation purpose, the now brightness of LED lamp can be relatively low, now arranges the time that time delay is shorter, and the power namely exported to LED lamp within a cycle is relatively low.And when ambient light is dark, due to the good illuminance of needs, now needing the power exported to LED lamp relatively big, the time of corresponding arranged time delay is longer.
In the present embodiment, two line style rear cutout actuators include being connected to circuit input end and driving the potentiometer 5 between control circuit 2, and the resistance on potentiometer 5 determines the length of delay time.Control circuit 3 is driven to include comparison control circuit 31, PWM generator circuit 32 and drive circuit 33.Comparison control circuit 31 connects potentiometer 5 and zero cross detection circuit 2, and comparison control circuit 31 controls the dutycycle of PWM generator circuit 32 according to the resistance exported on signal and potentiometer 5 of zero cross detection circuit 2.In actual use, user only need to can realize the control of delay time by the gear (resistances that different gears is corresponding different) of regulator potentiometer 5, namely realizes the light modulation of LED lamp.
Below with reference to Fig. 1, the principle adopting potentiometer 5 and zero cross detection circuit 2 to dim is described in detail.When input current signal zero crossing, zero cross detection circuit 2 exports zero cross signal.Due to the impact by load characteristic, as when load is inductive load, phase contrast can be there is between zero signal on the voltage of input circuit and electric current, the zero crossing of the zero cross detection circuit 2 automatic detecting circuit electric current of meeting, comparison control circuit 31 outputs signal to PWM generator circuit 32, PWM generator circuit 32 exports Continuity signal to drive circuit 33, and drive circuit 33 drives alternating current switching circuit 1 to turn on.When load is resistive load, the zero cross signal that zero cross detection circuit 2 detects is input voltage zero-acrross ing moment, is absent from phase contrast between the two.
After alternating current switching circuit 1 turns on, comparison control circuit 31 judges the resistance of potentiometer 5, specifically judge that potentiometer 5 accesses the resistance of circuit part and accounts for the percentage ratio of potentiometer resistance, comparison control circuit 31 is according to this non-standard output signal pick-off signal to PWM generator circuit 32, realize the control of pwm signal dutycycle, namely realize the control of alternating current switching circuit 1 delay time.Implementation can be: arranges a charging capacitor connected with potentiometer 5 in comparison control circuit 31, comparison control circuit 31 obtains the magnitude of voltage on charging capacitor, when this magnitude of voltage reaches the voltage threshold set, comparison control circuit 31 exports pick-off signal to PWM generator circuit 32, alternating current switching circuit 1 ends, and charging capacitor discharges.But, this is not limited in any way by the present invention.Specifically, when potentiometer 5 10 accesses circuit, now charging capacitor reaches the time of voltage threshold is R1*C*10%, and wherein R1 is the resistance value of localizer 5, and C is the capacitance of charging capacitor, and namely alternating current switching circuit 1 turns off after turning on R1*C*10%.And when potentiometer 5 absolutely accesses circuit, now charging capacitor reaches the time of voltage threshold is R1*C, namely turn off after alternating current switching circuit conducting R1*C.When carrying out circuit design, can arranging the half period of input current signal equal to R1*C, namely when potentiometer 5 all accesses circuit, LED lamp is up to high-high brightness.
In the present embodiment, potentiometer 5 is key switch potentiometer.The potentiometer 5 of this kind of structure position of lamplight brightness when closing or opening LED lamp will not change.But, the structure of potentiometer 5 is not limited in any way by the present invention.
In actual use, when delay time very in short-term, LED lamp in dimming process it is possible that low-light level phosphere.For avoiding this problem, in the present embodiment, two line style rear cutout actuators also include minimum spacing regulator potentiometer 6, and minimum spacing regulator potentiometer 6 connects driving control circuit 3, and in the present embodiment, minimum spacing regulator potentiometer 6 connects comparison control circuit 31.Minimum spacing regulator potentiometer 6 determines the shortest time of time delay.Specifically, when potentiometer 5 accesses the resistance value of circuit part less than minimum spacing regulator potentiometer 6, pick-off signal is exported to PWM generator circuit 32 when comparison control circuit 31 is by time delay R2*C, alternating current switching circuit 1 cut-off after conducting R2*C, wherein R2 is the resistance of minimum spacing regulator potentiometer.The effect of minimum spacing regulator potentiometer 6 is the minimum brightness regulating LED lamp, it is to avoid flash of light occurs in dimming scope in LED lamp.In other embodiments, when load is the inductive loads such as electric fan time, minimum delay time R2*C cannot be below 35%, and no person will cause motor step-out phenomenon, produces high pressure self-induction pulse voltage and punctures alternating current switching circuit 1.
In the present embodiment, alternating current switching circuit 1 is made up of two VMOS pipe differential concatenations, and the control of two VMOS pipes is extremely all connected with driving control circuit 3.Electric current can be complete switched off by the alternating current switching circuit of this kind of structure when cut-off, and LED load does not have phosphere.Additionally, switching damage is not only down to minimum by this kind of alternating current switching circuit, and improve the output waveform of load, reduce the dash current to load, there is better dimming effect.In actual applications, when two line style rear cutout actuator power are relatively big, during as reached more than 400W, now the power of two VMOS pipes also will be relatively big, the problem needing to solve heat radiation when design.For having better radiating effect, in the present embodiment, alternating current switching circuit 1 is set and driving control circuit 3 is formed and is being circuit board and on the aluminum base circuit board of heat sink.This design can reduce the volume of two line style rear cutout actuators to greatest extent.But, this is not limited in any way by the present invention.The extra fin that increases can be adopted in other embodiments to dispel the heat.
In the present embodiment, power supply circuits 4 are connected in parallel on the two ends of alternating current switching circuit 1, and within the deadline of alternating current switching circuit, power supply circuits 4 obtain input voltage and form unidirectional current output after AC-DC changes.Owing to the conducting delay time of alternating current switching circuit 1 is variable, the power supply circuits 4 that the present embodiment is provided are had the voltage range of ultra-wide by this characteristic.But, the concrete structure of power supply circuits 4 is not limited in any way by the present invention.In other embodiments, can connect outside DC source be alternating current switching circuit 1, zero cross detection circuit 2 and drive control circuit 3 power.
Corresponding with above-mentioned two line style rear cutout actuators, the present embodiment also provides for a kind of two line style rear cutout control methods, including:
The input current of detection exchange, exports zero cross signal when input current zero crossing；
Within an input current cycle, control circuit is driven to receive zero cross signal and drive alternating current switching circuit to turn on, in load access circuit；
After time delay a period of time, driving control circuit output signal to make alternating-current switch end, described a period of time is less than or equal to the half period of input current.
In sum, two line style rear cutout actuators provided by the invention and control method detect AC input current by arranging zero cross detection circuit, control circuit is driven to drive the alternating current switching circuit conducting connected with load circuit when AC input current zero crossing, it is achieved passing zero trigger.Conducting time delay a period of time rear drive control circuit drives alternating current switching circuit cut-off, and the length of delay time, by determining the output power to load, namely determines the luminous flux (or illumination brightness) of load, reaches the purpose of light modulation.Traditional controllable silicon dimmer compared by two line style rear cutout actuators provided by the invention, it turns on when input current zero crossing, now exports to the current value of load less, load will not be produced bigger impact, the proof load performance safety when starting is stable, load long service life.Further, comparing traditional controllable silicon dimmer, the cut-off of alternating current switching circuit can realize complete switching off of load current, effectively prevent the generation of LED lamp threshold value phosphere.
Although the present invention is disclosed above by preferred embodiment; but it is not limited to the present invention, any know this those skilled in the art, without departing from the spirit and scope of the present invention; can doing a little change and retouching, therefore protection scope of the present invention is when being as the criterion depending on claims scope required for protection.
Claims (10)
1. a line style rear cutout actuator, it is characterised in that including:
Alternating current switching circuit, connects with load circuit；
Zero cross detection circuit, the input current of detection exchange, zero cross signal is exported when input current zero crossing；
Drive control circuit, connect described alternating current switching circuit and zero cross detection circuit respectively, within an input current cycle, alternating current switching circuit conducting is driven when described driving control circuit receives zero cross signal, in load access circuit, time delay a period of time rear drive control circuit output signal makes alternating current switching circuit end, and described a period of time is less than or equal to the half period of input current；
Power supply circuits, connect described alternating current switching circuit, zero cross detection circuit and driving control circuit respectively.
2. two line style rear cutout actuators according to claim 1, it is characterised in that described alternating current switching circuit is made up of two VMOS pipe differential concatenations, the control of two VMOS pipes is extremely all connected with driving control circuit.
3. two line style rear cutout actuators according to claim 1, it is characterised in that described two line style rear cutout actuators also include being connected to circuit input end and driving the potentiometer between control circuit, and the resistance on potentiometer determines the length of delay time.
4. two line style rear cutout actuators according to claim 3, it is characterized in that, described driving control circuit includes comparison control circuit, PWM generator circuit and drive circuit, described comparison control circuit connects described potentiometer and zero cross detection circuit, and described comparison control circuit controls the dutycycle of PWM generator circuit according to the resistance exported on signal and potentiometer of zero cross detection circuit.
5. two line style rear cutout actuators according to claim 3, it is characterised in that described potentiometer is key switch potentiometer.
6. two line style rear cutout actuators according to claim 1, it is characterized in that, described two line style rear cutout actuators also include minimum spacing regulator potentiometer, and described minimum spacing regulator potentiometer connects described driving control circuit, and described minimum spacing regulator potentiometer determines the shortest time of time delay.
7. two line style rear cutout actuators according to claim 6, it is characterised in that described alternating current switching circuit and driving control circuit are formed on aluminum base circuit board.
8. two line style rear cutout actuators according to claim 1, it is characterized in that, described power supply circuits are connected in parallel on the two ends of described alternating current switching circuit, and within the deadline of alternating current switching circuit, power supply circuits obtain input voltage and form unidirectional current output after AC-DC changes.
9. two line style rear cutout actuators according to claim 1, it is characterised in that described input voltage range for 220V～240V, frequency is 50Hz.
10. a line style rear cutout control method, it is characterised in that including:
The input current of detection exchange, exports zero cross signal when input current zero crossing；
Within an input current cycle, control circuit is driven to receive zero cross signal and drive alternating current switching circuit to turn on, in load access circuit；
After time delay a period of time, driving control circuit output signal to make alternating current switching circuit end, described a period of time is less than or equal to the half period of input current.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610206302.3A CN105813260B (en) | 2016-04-01 | 2016-04-01 | Adjuster and adjusting method are cut after two line styles |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610206302.3A CN105813260B (en) | 2016-04-01 | 2016-04-01 | Adjuster and adjusting method are cut after two line styles |
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| CN105813260A true CN105813260A (en) | 2016-07-27 |
| CN105813260B CN105813260B (en) | 2018-04-27 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106385745A (en) * | 2016-08-24 | 2017-02-08 | 宁波奇特电子科技有限公司 | Novel single-chip microcomputer light adjusting switch |
| WO2019210704A1 (en) * | 2018-05-01 | 2019-11-07 | 上海晶丰明源半导体股份有限公司 | Power control circuit, driving system, chip, power control method, and driving method |
| WO2019242282A1 (en) * | 2018-06-21 | 2019-12-26 | 上海晶丰明源半导体股份有限公司 | Control circuit, led driving chip, led driving system, and led driving method |
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| US11388792B2 (en) | 2018-06-21 | 2022-07-12 | Shanghai Bright Power Semiconductor Co., Ltd. | Control circuit, LED driving chip, LED driving system and LED driving method thereof |
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