CN112738947A - Lighting circuit and synchronization method thereof - Google Patents
Lighting circuit and synchronization method thereof Download PDFInfo
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- CN112738947A CN112738947A CN201910980360.5A CN201910980360A CN112738947A CN 112738947 A CN112738947 A CN 112738947A CN 201910980360 A CN201910980360 A CN 201910980360A CN 112738947 A CN112738947 A CN 112738947A
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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
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- 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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention relates to a lighting circuit comprising: an alternating current power supply; a first LED light emitting assembly and a second LED light emitting assembly; the first driving circuit is connected between the alternating current power supply and the first LED light-emitting component; the second driving circuit is connected between the alternating current power supply and the second LED light-emitting component; the LED lamp also comprises a control signal generating device, wherein the control signal generating device can detect the time difference of the starting currents of the first LED light-emitting component and the second LED light-emitting component correspondingly obtained by the first driving circuit and the second driving circuit respectively, and supplies power to the first driving circuit/the second driving circuit which obtains the starting currents in a lagging mode so as to achieve synchronous lighting of the first LED light-emitting component and the second LED light-emitting component.
Description
Technical Field
The invention relates to the technical field of illumination, in particular to an illumination circuit and a synchronization method thereof.
Background
In the prior art, a plurality of driving circuits are usually used to realize synchronous control of a plurality of light emitting components, for example, synchronous control of two LED light emitting components is taken, a schematic diagram of which is shown in fig. 1, an ac power supply 1 is connected to a first LED light emitting component 5 and a second LED light emitting component 6 through a first driving circuit 3 and a second driving circuit 4, respectively, because of a difference in starting time of the first driving circuit 3 and the second driving circuit 4 and a difference in starting voltage of the first LED light emitting component 5 and the second LED light emitting component 6; in order to avoid the above two differences, designers often need to modify hardware parameters or software programs of the first driving circuit 3 or the second driving circuit 4 to synchronize the start times of the first LED light emitting element 5 and the second LED light emitting element 6, such modification requires a lot of design effort, and the number of the driving circuits is increased due to the change of the hardware parameters or the software programs, which is not favorable for the normalization of the product.
Therefore, there is a need for an improved lighting circuit for an existing light emitting assembly.
Disclosure of Invention
The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an illumination circuit capable of synchronously lighting a plurality of light emitting elements while ensuring the uniformity of the structure of the drive circuit.
Specifically, the present invention provides a lighting circuit comprising: an alternating current power supply; a first LED light emitting assembly and a second LED light emitting assembly; the first driving circuit is connected between the alternating current power supply and the first LED light-emitting component; the second driving circuit is connected between the alternating current power supply and the second LED light-emitting component; the control signal generating device can detect the time difference of the first driving circuit and the second driving circuit which respectively and correspondingly obtain the starting currents of the first LED light-emitting component and the second LED light-emitting component, and supplies power to the first driving circuit/the second driving circuit which firstly obtains the starting currents in a delayed mode to achieve synchronous lighting of the first LED light-emitting component and the second LED light-emitting component.
Compared with the prior art, the invention obtains the time difference of the starting currents of the first LED light-emitting component and the second LED light-emitting component respectively and correspondingly by arranging the first driving circuit and the second driving circuit which are detected by the control signal generating device, and supplies power to the first driving circuit/the second driving circuit which obtains the starting currents in a lagging mode so as to realize synchronous lighting of the first LED light-emitting component and the second LED light-emitting component.
In a preferred embodiment of the present invention, the control signal generating device includes: the first switch circuit is connected between the alternating current power supply and the first drive circuit; the second switch circuit is connected between the alternating current power supply and the second drive circuit; and the control unit is used for respectively sending control signals to the first switch circuit and the second switch circuit so as to control the on-off of the first switch circuit and the second switch circuit.
In a preferred embodiment of the present invention, the control unit includes: one port of the A/D converter is connected with the first resistor and/or the second resistor, and the other port of the A/D converter is connected with the electronic switch; one terminal of the electronic switch is connected to the a/D converter, and the other terminal is alternatively connectable to the first input terminal of the comparator, or to the second input terminal of the comparator via the register; and the timer is connected with the output end of the comparator.
In a preferred embodiment of the present invention, the first switch circuit includes: a first relay having a third inductance, a first relay contact, and a first contactor; the base electrode of the first triode is connected with the control signal emitting end of the control unit on one hand and one end of the third inductor on the other hand, the emitting electrode of the first triode is connected with the grounding end of the alternating current power supply on the one hand and the grounding end of the first driving circuit on the other hand, and the collecting electrode of the first triode is connected with the other end of the third inductor through a ninth resistor; the second switching circuit includes: a second relay having a fourth inductance, a second relay contact, and a second contactor; a base electrode of the second triode is connected with a control signal transmitting end of the control unit on one hand and one end of a fourth inductor on the other hand, an emitting electrode of the second triode is connected with a grounding end of an alternating current power supply on the one hand and a grounding end of a second driving circuit on the other hand, and a collecting electrode of the second triode is connected with the other end of the fourth inductor through a tenth resistor; the first triode and the second triode can be switched on or switched off under the driving of the control unit, and the first contactor and the second contactor can be correspondingly engaged with or disengaged from the first relay contact and the second relay contact when the first triode and the second triode are switched on or switched off, so that the connection or disconnection between the alternating current power supply and the driving circuit and the second driving circuit is realized.
In a preferred technical scheme of the invention, the first driving circuit at least comprises a first constant current circuit, and a load end of the first constant current circuit is connected with the first light-emitting component; the second driving circuit at least comprises a second constant current circuit, and the load end of the second constant current circuit is connected with the second light-emitting component.
In a preferred technical solution of the present invention, the method further comprises: a first detection circuit and a second detection circuit, the first detection circuit comprising: a first secondary inductor coupled to a first primary inductor of the first constant current circuit; a first resistor in series with the first secondary inductor; a first diode connected in series with the first secondary inductor; a first capacitor connected in parallel with the first resistor; a first voltage dividing resistor connected in series with the first secondary inductor; the second detection circuit includes: a second secondary inductor coupled to a second primary inductor of the second constant current circuit; a second resistor connected in series with the second secondary inductor; a second diode in series with the second secondary inductor; a second capacitor connected in parallel with the second resistor; and a second voltage divider resistor connected in series with the second secondary inductor; the control signal generating circuit is respectively connected with the first detecting circuit and the second detecting circuit so as to detect a first voltage and a second voltage at two ends of the first resistor and the second resistor, and the control signal generating circuit can determine the time difference of the voltage of the first main inductor and the voltage of the second main inductor reaching a steady state according to the detection result of the first voltage and the second voltage.
In this technical solution, the first detection circuit and the second detection circuit are provided to detect the time when the current flowing through the first main inductor and the second main inductor enters the steady state, in this embodiment, the first sub inductor and the second sub inductor are provided to be respectively coupled to the first main inductor and the second main inductor, specifically, the first sub inductor and the first main inductor, the second main inductor and the second sub inductor are respectively wound on the same iron core or magnetic core to form a transformer, the first sub inductor and the second sub inductor can generate induced currents when the current flows through the first main inductor and the second main inductor, respectively, so that the time when the current of the first main inductor and the current of the second main inductor enter the steady state can be confirmed by measuring the time when the voltage values V1 and V2 at both ends of the first resistor connected in series with the first sub inductor and the second resistor connected in series with the second sub inductor enter the steady state, only when the first main inductor L1 and the second main inductor enter the steady state, the first LED lighting assembly and the second LED lighting assembly can obtain the starting current.
In this technical solution, taking the first detection circuit as an example, the magnitude of V1 can be respectively regulated and controlled by the coil turn ratio of the first secondary inductor and the first primary inductor and the resistance value of the first voltage dividing resistor to be matched with the voltage signal receiving end of the control signal generating device, in some technical solutions, the first voltage dividing resistor may not be provided, and V1 can be regulated and controlled only by the coil turn ratio of the first secondary inductor and the first primary inductor.
In order to achieve the above object, the present invention provides a synchronization method for synchronizing start times of different constant current circuits in the above lighting circuit including a plurality of constant current circuits, the synchronization method including the steps of: a steady-state voltage providing step of providing voltage values X1 and X2 of the first constant current circuit and the second constant current circuit at two ends of the first resistor and the second resistor in a steady state; a time difference determining step of determining a time difference between a time at which the voltage value V1 of the first resistor reaches X1 and a time at which the voltage value V2 of the second resistor reaches X2 during the starting process; and a control signal output step of outputting a control signal to the corresponding first switch circuit or second switch circuit with a delay with respect to the first main inductor or second main inductor which has first reached the steady state, based on the time difference determined in the time difference determination step.
In a preferred embodiment of the present invention, a delay time between control signals output to the first switch circuit and the second switch circuit is equal to a time difference.
In the preferred technical scheme of the invention, the method also comprises the following steps: and a lag time storage step of storing the lag time.
In a preferred embodiment of the present invention, before the step of determining the time difference, the method further includes: a synchronous mode switching step of switching the lighting circuit to a synchronous mode; after the time difference determining step, before the control signal outputting step, further comprising: and a working mode switching step, namely switching the lighting circuit to a working mode.
Drawings
FIG. 1 is a schematic diagram of a prior art lighting circuit;
FIG. 2 is a schematic diagram of a lighting circuit of a preferred embodiment of the present invention;
fig. 3 is a circuit diagram of a first constant current circuit and a first detection circuit of the lighting circuit according to the preferred embodiment of the present invention;
fig. 4 is a circuit diagram of a second constant current circuit and a second detection circuit of the lighting circuit of the preferred embodiment of the present invention;
fig. 5 is a circuit diagram of a control unit of the lighting circuit of the preferred embodiment of the present invention;
FIG. 6 is a schematic diagram of a first switching circuit of the lighting circuit of the preferred embodiment of the present invention;
FIG. 7 is a schematic diagram of a second switching circuit of the lighting circuit of the preferred embodiment of the present invention;
fig. 8 is a waveform diagram of the voltage value across the first resistor R1 and the current value flowing through the first LED lighting assembly in the lighting circuit according to the preferred embodiment of the present invention;
fig. 9 is a flow chart of the synchronization method of the preferred embodiment of the present invention.
Description of reference numerals:
1-an alternating current power supply; 2-control signal generating means, 21-first switching circuit, 211-first relay, 212-third inductance, 213-first relay contact, 214-first contactor, 215-first triode; 22-second switching circuit, 221-second relay, 222-fourth inductor, 223-second relay contact, 224-second contactor, 225-second triode, control unit 23; 3-a first driving circuit, 31-a first constant current circuit, 41-a first input rectifying circuit; 4-a second driving circuit, 41-a second constant current circuit, and 42-a second input rectifying circuit; 5-a first LED lighting assembly; 6-a second LED lighting assembly; 7-a first detection circuit; 8-a second detection circuit; r1-a first resistor, R2-a second resistor, R3-a third resistor, R4-a fourth resistor, R5-a first divider resistor, R6-a sixth resistor, R7-a seventh resistor, R8-a second divider resistor, R9-a ninth resistor, and R10-a tenth resistor; d1-first diode, D2-second diode, D3-third diode, D5-fourth diode; c1-first capacitor, C2-second capacitor, C3-third capacitor, C4-fourth capacitor, C5-fifth capacitor, C6-sixth capacitor; l1-first main inductor, L2-first auxiliary inductor, L3-second main inductor, L4-second auxiliary inductor; IC 1-first drive, IC 2-second drive; q1-first N channel MOS tube, Q2-second N channel MOS tube; A/D1-first A/D converter, A/D2-second A/D converter; s1-first electronic switch, S2-second electronic switch; u1-first comparator, U2-second comparator; 100-a first register, 200-a second register; 101-a first timer, 201-a second timer, 102-a first INT signal circuit, 202-a second INT signal circuit; 103-a processor.
Detailed Description
The present invention will be described in further detail below with reference to the accompanying drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto.
Fig. 2 shows a schematic diagram of a lighting circuit of the present embodiment, the lighting circuit including: the LED driving circuit comprises an alternating current power supply 1, a control signal generating device 2, a first driving circuit 3, a second driving circuit 4, a first LED light-emitting component 5, a second LED light-emitting component 6, a first detection circuit 7 and a second detection circuit 8; wherein, the alternating current power supply 1 is connected with the control signal generating device 2, the control signal generating device 2 is respectively and correspondingly connected with the first LED luminous component 5 and the second LED luminous component 6 through the first drive circuit 3 and the second drive circuit 4, on the one hand, the first detection circuit 7 and the second detection circuit 8 are respectively connected between the control signal generating device 2 and the first drive circuit 3 and the second drive circuit 4, concretely, the control signal generating device 2 can respectively and correspondingly obtain the time difference of the starting current of the first LED luminous component 5 and the second LED luminous component 6 through the first detection circuit 7 and the second detection circuit 8 to detect the first drive circuit 3 and the second drive circuit 4, and the first drive circuit 3/the second drive circuit 4 which obtains the starting current firstly are supplied with power in a hysteresis mode to realize synchronous lighting of the first LED luminous component 5 and the second LED luminous component 6.
Specifically, as shown in fig. 2, 6 and 7, the control signal generating device 2 includes a first switching circuit 21 connected between the ac power supply 1 and the first driving circuit 3; a second switch circuit 22 connected between the ac power supply 1 and the second drive circuit 4; the control unit 23 comprises a voltage signal receiving end and a control signal transmitting end, and is used for respectively sending control signals to the first switch circuit 21 and the second switch circuit 22 to control the on-off of the first switch circuit 21 and the second switch circuit 22, so as to control the on-off of the alternating current power supply 1 and the first drive circuit 3 and the second drive circuit 4; the first driving circuit 3 at least comprises a first constant current circuit 31 and a first input rectifying circuit 32, the second driving circuit 4 at least comprises a second constant current circuit 41 and a second input rectifying circuit 42, and the first detecting circuit 7 and the second detecting circuit 8 are respectively connected with the first constant current circuit 31 and the second constant current circuit 41 correspondingly and are connected with a voltage signal receiving end of the control signal generating device 2 to detect the time difference of current starting time in the first driving circuit 3 and the second driving circuit 4.
Fig. 3 is a specific circuit diagram of the first constant current circuit 31 and the first detection circuit 7 in the lighting circuit, according to fig. 3, the first detection circuit 7 is arranged inside a dashed line frame, the first constant current circuit 31 is arranged outside the dashed line frame, the first constant current circuit 31 includes a first N-channel MOS transistor Q1, a source of the first N-channel MOS transistor Q1 is connected to a third capacitor C3 connected to the ground through a third resistor R3 in series, and is connected to an input terminal CS1 of a first driving IC1 of the first constant current circuit 31 through a fourth resistor R4 in series, the first driving IC1 has an input terminal CS1 capable of detecting a current signal, a ground terminal GND1, a driving power supply Vcc1, and an output terminal Gate 1; the drain of the first N-channel MOS transistor Q1 is connected in series to the first main inductor L1, on the other hand, to a third capacitor C3 through a third diode D3, the cathode of the third diode D3 is connected to a third capacitor C3, the anode is connected to the drain of the first N-channel MOS transistor Q1, the first main inductor L1 is connected to the third capacitor C3 through the series first LED lighting module 5, on the other hand, to the third capacitor C3 through the series fourth capacitor C4; the Gate of the first N-channel MOS transistor Q1 is connected to the output Gate1 of the driver IC 1; GND1 is connected to ground; the first detection circuit 7 comprises a first secondary inductor L2 coupled with a first main inductor L1, one end of the first secondary inductor L2 is connected in series with a first diode D1 and connected with the ground terminal of a third capacitor C3, the other end is connected in series with a first voltage dividing resistor R5 and a first resistor R1 in sequence, two ends of the first resistor R1 are connected in parallel with the first capacitor C1, one end of the first resistor R1 is connected with the first voltage dividing resistor R5 on the one hand and used for being connected with the voltage signal receiving end of the control unit 23 on the other hand, and the other end is connected with a first diode D1 to form a loop, wherein the cathode of the first diode D1 is connected with the first secondary inductor L2, and the anode is connected with the first resistor R1; it should be noted that Vcc1 is connected to the first switch circuit 21, and can obtain a high level when the first switch circuit 21 is connected to drive the first constant current circuit 31 to supply power to the output terminal.
As shown in fig. 4, the circuit structure of the second constant current circuit 41 is the same as that of the first constant current circuit 31, specifically, the second detection circuit 8 is arranged inside the dashed-line frame, the second constant current circuit 41 is arranged outside the dashed-line frame, the second constant current circuit 41 includes a second N-channel MOS transistor Q2, the source of the 2 nd N-channel MOS transistor Q2 is connected to the fifth capacitor C5 connected to the ground through a series resistor R6, and is connected to the input terminal CS2 of the second drive IC2 of the second constant current circuit 41 through a series resistor R7, and the second drive IC2 has an input terminal CS2 capable of detecting current, a ground terminal GND2, a drive power supply Vcc2, and an output terminal Gate 2; the drain of the second N-channel MOS transistor Q2 is connected in series to the second main inductor L3, on the other hand, to the fifth capacitor C5 through the fourth diode D4, the cathode of the fourth diode D4 is connected to the fifth capacitor C5, the anode is connected to the drain of the second N-channel MOS transistor Q2, the second main inductor L3 is connected to the fifth capacitor C5 through the series second LED lighting element 6, on the other hand, the fifth capacitor C5 through the series sixth capacitor C6; the Gate of the second N-channel MOS transistor Q1 is connected to the output Gate2 of the second driver IC 2; GND2 is connected to ground; vcc2 is connected to second switch circuit 22; the second detection circuit 8 includes a second secondary inductor L4 coupled to the second main inductor L3, one end of the second secondary inductor L4 is connected in series to a second diode D2 and connected to the ground terminal of the fifth capacitor C5, the other end of the second secondary inductor L4 is connected in series to a second voltage dividing resistor R8 and a second resistor R2, the two ends of the second resistor R2 are connected in parallel to the second capacitor C2, one end of the second resistor R2 is connected to the second voltage dividing resistor R8, the other end of the second resistor R2 is connected to the voltage signal receiving end of the control signal generating device 2, and the other end of the second resistor R2 is connected to form a loop, wherein the cathode of the second diode D2 is connected to the second secondary inductor L4, and the anode is connected to the second resistor R2.
It should be noted that, in the preferred embodiment of this embodiment, as shown in fig. 3 and fig. 4, the first constant current circuit 31 and the second constant current circuit 32 are both designed as BUCK circuits, and in some alternative embodiments, the first constant current circuit 31 and the second constant current circuit 32 may also be designed as other types of constant current circuits, as long as the output end of the constant current circuit is connected in series with an inductor for preventing current from suddenly changing, the time when the inductor enters a steady state can be sampled by a detection circuit which is designed to be the same as or equivalent to the first detection circuit 7 or the second detection circuit 8, so as to obtain the time difference of the current start time in the first drive circuit 3 and the second drive circuit 4.
Referring to fig. 5, the control unit 23 will be described, a voltage signal receiving terminal of the control unit 23 is provided with a first a/D converter a/D1 and a second a/D converter a/D2, each of the first a/D converter a/D1 and the second a/D converter a/D2 has a port corresponding to the connection with the first resistor R1 and the second resistor R2, respectively, since the first constant current circuit 31 and the second constant current circuit 41 have the same connection relationship with the control unit 23, the following first describes a structure corresponding to the first constant current circuit 31 in the control unit 23, the control unit 23 further has a first electronic switch S1, one terminal of the first electronic switch S1 is connected to the first a/D converter a/D1, the other terminal is a switchable terminal, which can be alternatively connected to a first input terminal of the first comparator U1, or, the second input terminal of the first comparator U1 is connected via the first register 100, the output terminal of the first comparator U1 is connected to the first timer 101, one input port of the first timer 101 is connected to the first INT signal circuit 102, and the output port of the first timer 101 is connected to the processor 103; similarly, the control unit 23 further has a second electronic switch S2, one terminal of the second electronic switch S2 is connected to the second a/D converter a/D2, the other terminal is a switchable terminal, which can be alternatively connected to the first input terminal of the second comparator U2, or connected to the second input terminal of the second comparator U2 via the second register 200, the output terminal of the second comparator U2 is connected to the second timer 201, one input port of the second timer 201 is connected to the second INT signal circuit 202, the output port of the second timer 201 is connected to the processor 10, the processor 103 is connected to the first switch circuit 21 and the second switch circuit 22 respectively, so as to send control signals to the first switch circuit 21 and the second switch circuit 22 respectively, the control signals include control signals for the first control signal and the second control signal, it is noted that, in this embodiment, since the first constant current circuit 31 and the second constant current circuit 41 share one ac power supply 1 and are synchronously powered on, the first INT signal circuit 102 and the second INT signal circuit 202 do not need to be separately provided, and only one INT signal circuit is provided to detect the voltage signal of the ac power supply 1.
Next, referring to fig. 6, the first switch circuit 21 will be described, and the first switch circuit 21 includes: a first relay 211, the first relay 211 having a third inductor 212, a first relay contact 213, a first contactor 214 and a first transistor 215, a base of the first transistor 215 being connected to a control signal transmitting terminal of the control unit 23 and to one end of the third inductor 212, an emitter of the first transistor 215 being connected to a ground terminal of the ac power supply 1 and to a ground terminal of the first constant current circuit 31, a collector of the first transistor 215 being connected to the other end of the third inductor 212 through a ninth resistor R9, one end of the first relay contact 213 being connected to an anode of the ac power supply 1, and the other end being connected to the Vcc 1.
As shown in fig. 7, the second switch circuit 22 includes: a second relay 221, the second relay 221 having a fourth inductance 222, a second relay contact 223 and a second contactor 224; and a second transistor 225, a base of the second transistor 225 is connected to the control signal emitting end of the control unit 23, and is connected to one end of the fourth inductor 222, an emitter of the second transistor 225 is connected to the ground end of the ac power supply 1, and is connected to the ground end of the second constant current circuit 41, a collector of the second transistor 225 is connected to the other end of the fourth inductor 222 through a tenth resistor R10, one end of a second relay contact 223 is connected to the positive electrode of the ac power supply 1, and the other end is connected to Vcc 2.
Wherein, the first transistor 215 and the second transistor 225 can be driven to be turned on or off by the control signal transmitting terminal, and the first contactor 214 and the second contactor 224 can be correspondingly engaged with or disengaged from the first relay contact 213 and the second relay contact 223 when the first transistor 215 and the second transistor 225 are turned on or off, so as to achieve the connection or disconnection between the ac power supply 1 and the first constant current circuit 31 and the second constant current circuit 41, specifically, the control signals include a first control signal and a second control signal, taking the first switch circuit 21 as an example, the first transistor 215 is an NPN type transistor, the first control signal is a voltage signal, when the first control signal is received, that is, after a forward voltage is applied to the base, the first transistor 215 is turned on, the third inductor 212 generates an induced current, the first contactor 214 is attracted to be in contact with the first relay contact 213, it should be noted that, in some technical solutions, the first transistor 215 may be a PNP transistor and be correspondingly adjusted to output the first control signal as a low level signal to implement conduction of the first transistor 215, and in other technical solutions, the first transistor 215 may also be replaced by another semiconductor switch tube, for example, an MOS transistor.
The operation principle of the lighting circuit is described below with reference to fig. 2 to 7:
the first detection circuit 7 and the second detection circuit 8 are provided for detecting the time when the current flowing through the first main inductor L1 and the second main inductor L3 enters the steady state, in the present embodiment, the first sub-inductor L2 and the second sub-inductor L4 are provided to be coupled to the first main inductor L1 and the second main inductor L3, respectively, specifically, the first sub-inductor L2 and the first main inductor L1, the second main inductor L3 and the second sub-inductor L4 are wound around the same iron core or magnetic core to form a transformer, respectively, the first sub-inductor L2 and the second sub-inductor L4 can generate an induced current when the current flows through the first main inductor L1 and the second main inductor L3, respectively, and therefore, the time when the voltage values V1 and V5 across the first resistor R4642 connected in series with the first sub-inductor L2 and the second resistor R2 connected in series enter the steady state can be measured to confirm the time when the current entering the first main inductor L1 and the second main inductor L3 enter the steady state, the first LED lighting assembly 5 and the second LED lighting assembly 6 can obtain the starting current only when the first main inductor L1 and the second main inductor L3 enter the steady state.
Taking the first detection circuit 7 as an example, when a current flows through the first main inductor L1, the induced current generated in the first secondary inductor L2 charges the first capacitor C1, the electric energy is stored in the first secondary inductor L2 and also powers the first resistor R1 and the first voltage dividing resistor R5, when the current in the first main inductor L1 gradually decreases to zero, the first secondary inductor L2 forms a conducting loop through the first diode D1, so as to power the output load, the first resistor R1 and the first voltage dividing resistor R5, and at the same time, the first capacitor C1 also discharges the first resistor R1 and the first voltage dividing resistor R5 to power the output load, in this embodiment, the magnitude of V1 is regulated by the coil turn ratio of the first secondary inductor L2 and the first main inductor L1 and the resistance value of the first voltage dividing resistor R5, respectively, so as to be adapted to the voltage signal receiving end of the control signal generating device 2, in some embodiments, the first voltage dividing resistor R5 may not be provided, the V1 is regulated and controlled only by the winding turns ratio of the first secondary inductor L2 and the first primary inductor L1, and the structure of the second detection circuit 8 is the same as the structure and the operation principle of the first detection circuit 7, and will not be described again.
The control signal generating device 2 has a synchronization mode capable of modifying a control parameter to synchronize the start time of the first LED lighting assembly 5 and the second LED lighting assembly 6 and an operation mode for controlling the lighting states of the first LED lighting assembly 5 and the second LED lighting assembly 6 by using the modified control parameter in the synchronization mode, and the control signal generating device 2 can switch between the synchronization mode and the operation mode under the trigger of an external signal.
When the ac power supply 1 is turned on for the first time after the lighting circuit enters the synchronous mode, the first switch circuit 21 and the second switch circuit 22 are turned on, the first constant current circuit 31 and the second constant current circuit 41 respectively obtain voltages Vcc1 and Vcc2 for driving the first driver IC1 and the second driver IC2 from the ac power supply 1, the first constant current circuit 31 and the second constant current circuit 41 respectively output currents to the first LED lighting assembly 5 and the second LED lighting assembly 6 to light the first LED lighting assembly 5 and the second LED lighting assembly 6 until the first LED lighting assembly 5 and the second LED lighting assembly 6 stably emit light, in this process, the first control signal and the second control signal are synchronously output from the processor 103, and switchable terminals of the first electronic switch S1 and the second electronic switch S2 connected to the first a/D converter a/D1 and the second a/D converter a/D2 are respectively and correspondingly connected to the first register 100 and the second register 200 side, when the first LED lighting assembly 5 and the second LED lighting assembly 6 are stably lighted, the voltage signals detected from the first constant current circuit 31 and the second constant current circuit 41, that is, the voltages at the two ends of the first resistor R1 and the second resistor R2 are converted into digital signals by the first a/D converter a/D1 and the second a/D converter a/D2, and then the voltage value X1 and the voltage value X2 are stored in the first register 100 and the second register 200.
The voltage value X1 and the voltage value X2 are voltage values corresponding to two ends of the first resistor R1 and the second resistor R2 when the first constant current circuit 31 and the second constant current circuit 41 are in a stable state, respectively. In the subsequent steps, the time when the two ends of the first resistor R1 and the second resistor R2 reach the voltage values respectively reflects the time when the first constant current circuit 31 and the second constant current circuit 41 reach the steady state.
Next, the ac power supply 1 is turned off, and switchable terminals of the first electronic switch S1 and the second electronic switch S2 connected to the first a/D converter a/D1 and the second a/D converter a/D2 are connected to the first comparator U1 and the second comparator U2 side, respectively.
When the ac power supply 1 is turned on again, the first INT signal circuit 102 and the second INT signal circuit 202 are triggered, wherein the first INT signal circuit 102 and the second INT signal circuit 202 can detect the input voltage signals of the first constant current circuit 31 and the second constant current circuit 41, respectively, and trigger the first timer 101 and the second timer 201 to start timing when the voltage signals are detected, specifically, in the present embodiment, when the ac power supply 1 is turned on again, the first timer 101 and the second timer 201 start timing, and the first comparator U1 and the second comparator U2 can compare the voltage value V1 at both ends of the first resistor R1 and the voltage value V2 at both ends of the second resistor R2, which are obtained in real time, with the X1 and the X2, respectively, and stop timing when V1 is equal to X1 and V2 is equal to X2, respectively.
Referring to fig. 8, the inventor finds, through theoretical analysis and waveform detection, that, taking the first LED lighting assembly 5 as an example, the current I flowing through the first LED lighting assembly 5outThe start point of the waveform of (2) is almost identical to the stable point of the voltage value V1 waveform across the first resistor R1, and therefore, the start time of the current output can be determined by detecting the time when the start-time voltage value V1 and the voltage value V2 reach the stable point. Therefore, when V1 and V2 reach X1 and X2, respectively, and the timing is stopped, the timing times T1 and T2 are current start times of the first constant current circuit 31 and the second constant current circuit 41.
Thereafter, the processor 103 delays the output of the first/second control signals by | Δ T | according to the time difference Δ T of T1 and T2, specifically, when T1 > T2; when T1 < T2, the output of the first control signal is delayed by | Δ T |.
After the | Δ T | after the output time is obtained through calculation, the synchronous setting of the lighting circuit is completed, and the delayed output information of the first/second control signals is saved for the operation mode to call, so as to realize the synchronous lighting of the first and second LED lighting assemblies 5 and 6 in the operation mode.
In the present embodiment, in the synchronous mode, the control signal generating device 2 can respond according to the on/off of the ac power supply 1, and a specific implementation manner thereof may be to communicatively connect a power switch (not shown) of the ac power supply 1 with the processor 103 of the control signal generating device 2, and in some alternative implementation manners, the response made by the control signal generating device 2 may also be triggered by other signals.
Referring to fig. 9, the present embodiment provides a synchronization method for synchronizing the start times of different constant current circuits in an illumination circuit including a plurality of constant current circuits, based on the illumination circuit described above, including the steps of:
s01, a step of switching the synchronous mode, which switches the lighting circuit to the synchronous mode;
s02, a steady-state voltage providing step, namely providing voltage values X1 and X2 of the first resistor R1 and the second resistor R2 at two ends of the first constant current circuit 31 and the second constant current circuit 41 in a steady state;
and a time difference determining step of determining a time difference between a time at which the voltage value V1 of the first voltage reaches X1 and a time at which the voltage value V2 of the second voltage reaches X2 during the starting process S03.
And S04, an operation mode switching step, namely switching the lighting circuit to an operation mode.
And S05, a control signal output step of outputting a control signal to the corresponding first switch circuit 21 or second switch circuit 22 with a delay for the first main inductor L1 or second main inductor L3 which reaches the steady state first, based on the time difference determined in the time difference determination step.
And S06, a lag time storage step for storing the lag time.
In some alternative embodiments, the operation mode switching step may also be arranged after the lag time saving step, i.e. the synchronous setting of the first LED lighting assembly 5 and the second LED lighting assembly 6 is completed in the synchronous mode.
It will be appreciated by those of ordinary skill in the art that in the embodiments described above, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solutions claimed in the claims of the present application can be basically implemented without these technical details and various changes and modifications based on the above-described embodiments. Accordingly, in actual practice, various changes in form and detail may be made to the above-described embodiments without departing from the spirit and scope of the invention.
Claims (10)
1. A lighting circuit, comprising:
an alternating current power supply;
a first LED light emitting assembly and a second LED light emitting assembly;
the first driving circuit is connected between the alternating current power supply and the first LED light-emitting component;
the second driving circuit is connected between the alternating current power supply and the second LED light-emitting component;
the LED lamp is characterized by further comprising a control signal generating device, wherein the control signal generating device can detect the time difference of the starting currents of the first LED light-emitting component and the second LED light-emitting component correspondingly obtained by the first driving circuit and the second driving circuit respectively, and supply power to the first driving circuit/the second driving circuit which obtains the starting currents in a lagging mode so as to achieve synchronous lighting of the first LED light-emitting component and the second LED light-emitting component.
2. The lighting circuit of claim 1, wherein the control signal generating means comprises:
a first switching circuit connected between the ac power supply and the first driving circuit;
a second switching circuit connected between the ac power supply and the second driving circuit;
and the control unit is used for respectively sending control signals to the first switch circuit and the second switch circuit so as to control the on-off of the first switch circuit and the second switch circuit.
3. The lighting circuit of claim 2, wherein the control unit comprises:
one port of the A/D converter is connected with the first resistor and/or the second resistor, and the other port of the A/D converter is connected with an electronic switch;
one terminal of the electronic switch is connected to the a/D converter, the other terminal being alternatively connectable to a first input of a comparator or, via a register, to a second input of the comparator;
and the timer is connected with the output end of the comparator.
4. A lighting circuit as claimed in claim 2 or 3, wherein the first switching circuit comprises:
a first relay having a third inductance, a first relay contact, and a first contactor; and
a base electrode of the first triode is connected with a control signal transmitting end of the control unit on one hand and one end of the third inductor on the other hand, an emitting electrode of the first triode is connected with a grounding end of the alternating current power supply on the one hand and a grounding end of the first driving circuit on the other hand, and a collecting electrode of the first triode is connected with the other end of the third inductor through a ninth resistor;
the second switching circuit includes:
a second relay having a fourth inductance, a second relay contact, and a second contactor; and
a base electrode of the second triode is connected with a control signal transmitting end of the control unit on one hand and one end of the fourth inductor on the other hand, an emitting electrode of the second triode is connected with a grounding end of the alternating current power supply on the one hand and a grounding end of the second driving circuit on the other hand, and a collecting electrode of the second triode is connected with the other end of the fourth inductor through a tenth resistor;
the first triode and the second triode can be switched on or switched off under the driving of the control unit, and the first contactor and the second contactor can be respectively engaged with or disengaged from the first relay contact and the second relay contact when the first triode and the second triode are switched on or switched off so as to realize the connection or disconnection between the alternating current power supply and the driving circuit and the second driving circuit.
5. A lighting circuit according to any one of claims 1 to 3, wherein the first driving circuit includes at least a first constant current circuit, a load terminal of which is connected to the first light emitting element; the second driving circuit at least comprises a second constant current circuit, and the load end of the second constant current circuit is connected with the second light-emitting component.
6. The lighting circuit of claim 5, further comprising:
a first detection circuit and a second detection circuit,
the first detection circuit includes:
a first secondary inductor coupled to a first primary inductor of the first constant current circuit;
a first resistor in series with the first secondary inductor;
a first diode in series with the first secondary inductor;
a first capacitor connected in parallel with the first resistor; and
a first voltage dividing resistor connected in series with the first secondary inductor;
the second detection circuit includes:
a second secondary inductor coupled to a second primary inductor of the second constant current circuit;
a second resistor in series with the second secondary inductor;
a second diode in series with the second secondary inductor;
a second capacitor connected in parallel with the second resistor; and
a second voltage divider resistor connected in series with the second secondary inductor;
the control signal generating circuit is respectively connected with the first detecting circuit and the second detecting circuit to detect a first voltage and a second voltage at two ends of the first resistor and the second resistor, and the control signal generating circuit can determine a time difference of the voltages of the first main inductor and the second main inductor reaching a steady state according to the detection results of the first voltage and the second voltage.
7. A synchronization method for synchronizing the start times of different constant current circuits in an illumination circuit including a plurality of constant current circuits, wherein the illumination circuit is the illumination circuit as claimed in claim 6, the synchronization method comprising the steps of:
a steady-state voltage providing step of providing voltage values X1 and X2 of the first resistor and the second resistor at two ends of the first constant current circuit and the second constant current circuit in a steady state;
a time difference determining step of determining a time difference between a time when the voltage value V1 of the first resistor reaches X1 and a time when the voltage value V2 of the second resistor reaches X2 during the starting process;
and a control signal output step of outputting a control signal to the corresponding first or second switching circuit with a delay in response to the first or second main inductor which has first reached a steady state, based on the time difference determined in the time difference determination step.
8. The synchronization method according to claim 7, wherein a lag time between control signals output to the first switch circuit and the second switch circuit is equal to the time difference.
9. The synchronization method according to claim 7 or 8, further comprising the steps of:
and a lag time storage step of storing the lag time.
10. The synchronization method of claim 9, prior to the time difference determining step, further comprising:
a synchronous mode switching step of switching the lighting circuit to a synchronous mode;
after the time difference determining step, before the control signal outputting step, further comprising:
and a working mode switching step of switching the lighting circuit to a working mode.
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