CN109757008B - Control circuit and control method of lighting circuit and lighting circuit - Google Patents
Control circuit and control method of lighting circuit and lighting circuit Download PDFInfo
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- CN109757008B CN109757008B CN201910187503.7A CN201910187503A CN109757008B CN 109757008 B CN109757008 B CN 109757008B CN 201910187503 A CN201910187503 A CN 201910187503A CN 109757008 B CN109757008 B CN 109757008B
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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]
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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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- 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]
- H05B45/40—Details of LED load circuits
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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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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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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- 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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a control circuit of a lighting circuit, wherein alternating current input is rectified to obtain rectified voltage, a low-potential end of the rectified voltage is used as a reference ground, a load of the lighting circuit is formed by connecting N lamp strings in series, N is a natural number more than or equal to 2, when the control circuit detects that the alternating current input is connected with a dimmer, the N lamp strings are controlled to be conducted simultaneously, and the instruction current or the instruction voltage of the control circuit is first instruction current or first instruction voltage; and when the control circuit detects that the alternating current input is not connected with the light modulator, the N light strings are controlled to be respectively conducted according to the rectified voltage, and the instruction current or the instruction voltage of the control circuit is a second instruction current or a second instruction voltage. The invention can realize high power factor, is compatible with a dimmer, has simple scheme and is convenient to realize.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a control circuit and a control method of an illumination circuit and the illumination circuit.
Background
LED lamps are slowly replacing existing fluorescent and incandescent lamps because they are more energy efficient and environmentally friendly than conventional fluorescent and incandescent lamps. In incandescent lamps with dimmers, it is also desirable to replace them with LED lamps, so that the LEDs need to be compatible with the dimmer. The linear LED driving circuit is widely applied due to the advantages of simple realization and low cost. However, due to the inherent characteristics of the constant current conduction mode, the linear LED driving circuit has low power factor of the mainstream products of the linear dimming system in the current market, generates a large amount of harmonic pollution on the power grid, reduces the quality of the power grid, and generates interference on other electric equipment. Therefore, how to be compatible with the dimmer in the linear LED driving circuit and realize a high power factor is a problem to be solved at present.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a control circuit and a control method for an illumination circuit, and an illumination circuit, so as to solve the problems of low power factor and incompatibility with a dimmer in a linear driving circuit in the prior art.
The technical scheme includes that a control circuit of a lighting circuit is provided, alternating current input is rectified to obtain rectified voltage, a low-potential end of the rectified voltage serves as a reference ground, a load of the lighting circuit is formed by connecting N lamp strings in series, N is a natural number greater than or equal to 2, when the control circuit detects that the alternating current input is connected into a dimmer, the N lamp strings are controlled to be conducted simultaneously, and command current or command voltage of the control circuit is first command current or first command voltage; and when the control circuit detects that the alternating current input is not connected with the light modulator, the N light strings are controlled to be respectively conducted according to the rectified voltage, and the instruction current or the instruction voltage of the control circuit is a second instruction current or a second instruction voltage.
Optionally, a voltage detection circuit and a current control circuit are included, two input terminals of the voltage detection circuit are respectively connected to a high potential terminal and a low potential terminal of the rectified voltage, and the current control circuit receives an output voltage of the voltage detection circuit; the high-voltage end of the rectified voltage is connected to the first end of a first lamp string through a one-way conduction element, the second end of the first lamp string is connected to a reference ground through a first switch module, the second ends of the 2 nd to N th lamp strings are respectively connected to the 2 nd to N th switch modules through the 2 nd to N th one-way conduction elements, and the output voltage of the current control circuit is connected to the control ends of the 1 st to N th switch modules;
the voltage detection circuit detects the rectified voltage and judges whether the alternating current input end is connected with a light modulator, and when the light modulator is detected to be connected, the current control circuit controls the Nth switch module to be switched on and controls the 1 st to (N-1) th switch modules to be switched off; when the light modulator is not connected, the current control circuit controls one of the 1 st to N-th switch modules to be switched on and controls the rest to be switched off according to the output of the voltage detection circuit.
Optionally, when the voltage detection circuit detects that the dimmer is not connected, and when the rectified voltage is within a kth voltage range, the current control circuit controls the kth switch module to be turned on and the rest to be turned off, wherein k is a natural number from 1 to N.
Optionally, the first instruction current or the first instruction voltage is greater than or equal to the second instruction current or the second instruction voltage.
Optionally, the 1 st to nth switch modules are 1 st to nth MOSs, and gates of the 1 st to nth MOSs are control ends of the 1 st to nth switch modules.
Optionally, the lighting circuit includes N sampling resistors, a first terminal of the nth MOS is connected to the reference ground through the nth sampling resistor, first terminals of the 1 st to (N-1) th MOSs are connected to a first terminal of the nth MOS through the 1 st to (N-1) th sampling resistors, respectively, and the current control circuit receives voltages of the first terminals of the 1 st to N MOS.
Optionally, when it is detected that the dimmer is connected, the current control circuit performs operational amplification on the first end voltage of the nth MOS, and controls the gate voltage of the nth MOS so that the first end voltage of the nth MOS approaches the nth reference voltage; when the light modulator is not connected, the current control circuit performs operation amplification on the first end voltages of the 1 st to Nth MOS according to the output of the voltage detection circuit, and respectively controls the grid voltages of the 1 st to Nth MOS to enable the first end voltages of the 1 st to Nth MOS to be close to the 1 st to Nth reference voltages.
The invention also provides a control method of the lighting circuit, alternating current input is rectified to obtain rectified voltage, wherein a low potential end of the rectified voltage is used as a reference ground, a load of the lighting circuit is formed by connecting N lamp strings in series, N is a natural number more than or equal to 2, when the alternating current input is detected to be connected into a dimmer, the N lamp strings are controlled to be conducted simultaneously, and the command current or the command voltage is first command current or first command voltage; and when the AC input is detected not to be connected with the dimmer, controlling the N lamp strings to be respectively conducted according to the rectified voltage, wherein the instruction current or the instruction voltage is a second instruction current or a second instruction voltage.
Optionally, the high-voltage end of the rectified voltage is connected to the first end of the first light string through a unidirectional conducting element, the second end of the first light string is connected to the reference ground through a first switch module, and the second ends of the 2 nd to N th light strings are connected to the 2 nd to N th switch modules through 2 nd to N th unidirectional conducting elements respectively;
detecting the rectified voltage, judging whether the alternating current input end is connected with a light modulator or not, and controlling the switch-on of the Nth switch module and the switch-off of the switch modules from 1 st to (N-1) th when the light modulator is detected to be connected; and when the light modulator is not connected, controlling one of the 1 st to N switch modules to be switched on and controlling the rest to be switched off.
Optionally, when it is detected that the dimmer is not connected, when the rectified voltage is in a kth voltage range, the kth switch module is controlled to be turned on, and the rest of the kth switch module is controlled to be turned off, wherein k is a natural number from 1 to N.
Optionally, the 1 st to nth switch modules are 1 st to nth MOSs, and gates of the 1 st to nth MOSs are control ends of the 1 st to nth switch modules.
Optionally, the lighting circuit includes N sampling resistors, a first terminal of the nth MOS is connected to the reference ground through the nth sampling resistor, first terminals of the 1 st to (N-1) th MOSs are connected to a first terminal of the nth MOS through the 1 st to (N-1) th sampling resistors, respectively, and the current control circuit receives voltages of the first terminals of the 1 st to N MOS.
Optionally, when it is detected that the dimmer is connected, the first end voltage of the NMOS is subjected to operational amplification, and the gate voltage of the nth MOS is controlled so that the first end voltage of the nth MOS approaches to the nth reference voltage; when the light modulator is detected not to be connected, the first end voltages of the 1 st to N MOS are operated and amplified, and the grid voltages of the 1 st to N MOS are respectively controlled to enable the first end voltages of the 1 st to N MOS to be close to the 1 st to N reference voltages.
Another technical solution of the present invention is to provide a lighting circuit.
Compared with the prior art, the circuit structure and the method have the following advantages that: the high power factor can be realized, and the light modulator is compatible, and the scheme is simple, and is convenient to realize.
Drawings
FIG. 1 is a block diagram of an implementation of a lighting circuit and its control circuit according to the present invention;
FIG. 2(a) shows a capacitor connection method according to an embodiment of the present invention;
FIG. 2(b) shows a capacitor connection according to another embodiment of the present invention;
FIG. 3 is a diagram of a lighting circuit and a control circuit thereof according to an embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of a sampling resistor according to an embodiment of the present invention;
FIG. 5 is a schematic circuit diagram of a sampling resistor according to another embodiment of the present invention;
FIG. 6 shows an embodiment of a current control circuit 420 according to the present invention;
FIG. 7 shows a light string according to one embodiment of the present invention;
fig. 8 shows waveforms of the rectified voltage VREC, the voltage VF from the first string light to the nth string light, and the input current iin when the dimmer is not connected to the input terminal of the present invention;
fig. 9 shows waveforms of the rectified voltage VREC, the voltage VF from the first string light to the nth string light, and the input current iin when the input end of the present invention is connected to the dimmer and has a large dimming angle;
fig. 10 shows waveforms of the rectified voltage VREC, the voltage VF from the first string to the nth string, and the input current iin when the input end of the present invention is connected to the dimmer and has a small dimming angle;
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to only these embodiments. The invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention.
In the following description of the preferred embodiments of the present invention, specific details are set forth in order to provide a thorough understanding of the present invention, and it will be apparent to those skilled in the art that the present invention may be practiced without these specific details.
The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. It should be noted that the drawings are in simplified form and are not to precise scale, which is only used for convenience and clarity to assist in describing the embodiments of the present invention.
The invention provides a control circuit of a lighting circuit, wherein alternating current input is rectified to obtain rectified voltage VREC, wherein a low potential end of the rectified voltage is used as a reference ground, a load of the lighting circuit is formed by connecting N lamp strings in series, N is a natural number more than or equal to 2, when the control circuit detects that the alternating current input is connected with a dimmer, the N lamp strings are controlled to be conducted simultaneously, and the instruction current or the instruction voltage of the control circuit is first instruction current or first instruction voltage; and when the control circuit detects that the alternating current input is not connected with the light modulator, the N light strings are controlled to be respectively conducted according to the rectified voltage, and the instruction current or the instruction voltage of the control circuit is a second instruction current or a second instruction voltage. That is, if the rectified voltage VREC is in different voltage ranges, different strings are turned on. As an implementation mode, the rectification voltage is high, and the number of the conducted lamp strings is large; the rectification voltage is low, and the number of the connected lamp strings is small.
The invention can realize high power factor, is compatible with a dimmer, has simple scheme and is convenient to realize.
Referring to fig. 1, the control circuit 400 of the lighting circuit includes a voltage detection circuit 410 and a current control circuit 420, two input terminals of the voltage detection circuit 400 are respectively connected to a high potential terminal and a low potential terminal of the rectified voltage VREC, and the current control circuit 420 receives an output voltage of the voltage detection circuit 410; the high-voltage end of the rectified voltage VREC is connected to the first end of a first string LED1 through a unidirectional conduction element D01, the second end of the first string LED1 is connected to the reference ground through a first switch module SW1, the second ends of the 2 nd to N string LEDs 2 to LEDN are respectively connected to the 2 nd to N switch modules SW2 to SWN through 2 nd to N unidirectional conduction elements D02 to D0N, and the output voltage of the current control circuit 420 is connected to the control ends of the 1 st to N switch modules SW1 to SWN; the second end of the mth light string LEDk is connected to the first end of the (m +1) th light string LED (m +1), wherein m is a natural number from 1 to (N-1); the voltage detection circuit 410 detects the rectified voltage VREC and judges whether the alternating current input end is connected with a dimmer, and when the fact that the dimmer is connected is detected, the current control circuit 410 controls the switch-on of the switch module N, and controls the switch modules SW1 to SW (N-1) from 1 st to (N-1) to be switched off; when the dimmer is not connected, the current control circuit controls one of the 1 st to N-th switch modules SW1 to SWN to be switched on and controls the rest to be switched off according to the output of the voltage detection circuit.
As an embodiment, when the voltage detection circuit 410 detects that no dimmer is connected, when the rectified voltage VREC is in a kth voltage range, the current control circuit 420 controls the kth switch module SWk to be turned on and the rest to be turned off, where k is a natural number from 1 to N.
As an embodiment, when the dimmer is not connected, a smaller number of LED loads can be controlled to be turned on when the instantaneous value of the input voltage is lower, so that the loads can be turned on when the instantaneous value of the input voltage is lower. When the dimmer is switched in, the LED load is switched on only when the absolute value of the instantaneous value of the input voltage is greater than the forward conduction voltage drop of the LED load, since all the LED loads are switched in. In order to make the output power close when the dimmer is connected, the brightness is adjusted to the maximum and when the dimmer is not connected, the first command current or the first command voltage is generally set to be larger than the second command current or the second command voltage. In one embodiment, the first command current or the first command voltage is also set to be equal to the second command current or the second command voltage. Preferably, the first instruction current or the first instruction voltage is set to be 1-1.2 times of the second instruction current or the second instruction voltage.
Referring to fig. 2(a), two ends of the capacitor C00 are connected to the first end of the first string of lights and the second end of the nth string of lights, respectively. The addition of capacitor C00 reduces load ripple.
Referring to fig. 2(b), in another embodiment of the capacitor connection method, the capacitors C01-C0N are respectively connected in parallel with the first LED 1-the nth light string LEDN.
In one embodiment, the 1 st to nth switch modules are 1 st to nth MOSs, and gates of the 1 st to nth MOSs are control terminals of the 1 st to nth switch modules. The MOS transistor can be NMOS or PMOS. The description will be made by taking NMOS as an example. And the first end and the second end of the MOS are respectively a source electrode and a drain electrode of the NMOS.
Referring to fig. 3, the 1 st to nth switch modules SW1 to SWN are 1 st to nth NMOS, and the gates of the 1 st to nth switch modules SW1 to SWN are control terminals of the 1 st to nth switch modules SW1 to SWN.
With continued reference to fig. 3, the lighting circuit includes N sampling resistors, the source of the nth NMOS is connected to the reference ground through the nth sampling resistor R0N, the sources of the 1 st to (N-1) NMOS are connected to the source of the nth NMOS through the first to (N-1) th sampling resistors R01 to R0(N-1), respectively, and the current control circuit 420 receives the source voltages of the 1 st to N NMOS.
Referring to fig. 4, in another connection manner of the sampling resistors, a source of an nth NMOS is connected to the reference ground through the nth sampling resistor R0N, a source of an mth NMOS is connected to a source of the (m +1) th NMOS through the mth sampling resistor R0k, and the current control circuit 420 receives source voltages S01 to S0N of the 1 st to nth NMOS, where m is a natural number from 1 to (N-1).
Referring to fig. 5, in another connection manner of the sampling resistors, the sources of the 1 st to N NMOS are connected to the ground reference through the 1 st to N sampling resistors R01 to R0N, and the current control circuit 420 receives the source voltages S01 to S0N of the 1 st to N NMOS.
When the dimmer is detected to be switched on, the current control circuit 420 performs operational amplification on the source voltage S0N of the Nth NMOS, and controls the gate voltage G0N of the Nth NMOS so that the source voltage S0N of the Nth NMOS is close to the Nth reference voltage; when it is detected that the dimmer is not connected, the current control circuit 420 performs operation amplification on the source voltages S01 to S0N of the 1 st to N NMOS according to the magnitude of the rectified voltage VREC, and controls the gate voltages G01 to G0N of the 1 st to N NMOS such that the source voltages S01 to S0N of the 1 st to N NMOS approach the 1 st to N reference voltages.
Referring to fig. 6, an embodiment of the current control circuit 420 is shown. The source voltages S01-S0N of the 1 st-N NMOS are respectively connected to the negative input ends of the operational amplification circuits 421-42N, the 1 st-N reference voltages REF 1-REFN are respectively connected to the positive input end of the operational amplification circuit A, the voltage detection circuit 410 outputs enable signals EN 1-ENN which are respectively connected to the enable ends of the operational amplification circuits 421-42N, and the output ends of the operational amplification circuits 421-42N are connected to the gate voltages G01-G0N of the 1 st-N NMOS. The output terminal of the operational amplifier 42N is connected to the reference ground through the capacitor C421.
Referring to fig. 7, the mth light string is a plurality of LEDs connected in series in sequence. The number of different LED strings may not be equal.
To be compatible with the dimmer, the lighting circuit further comprises a bleeding circuit 300, both ends of the bleeding circuit 300 are connected to the high potential end and the low potential end of the rectified voltage, respectively, and the output of the voltage detection circuit 410 controls the bleeding circuit.
Referring to fig. 8, 9 and 10, N is 2, and the input end is not connected to the dimmer, the rectified voltage VREC when the dimmer is at a large angle or at a small angle, the voltage VF from the first string to the nth string, and the input current iin waveform. When the voltage detection circuit 410 detects that the input side is not connected to the dimmer, the bleeding circuit 300 is controlled not to generate a bleeding current. When the voltage detection circuit 410 detects that the input side is connected to the dimmer, the bleeding circuit 300 is controlled to generate a bleeding current to maintain the conduction of the dimmer.
The invention provides a lighting circuit comprising the control circuit 400.
The invention also provides a control method of the lighting circuit, alternating current input is rectified to obtain rectified voltage, wherein the low potential end of the rectified voltage is used as a reference ground, the load of the lighting circuit is formed by connecting N lamp strings in series, N is a natural number more than or equal to 2, and when the fact that the alternating current input is connected into a dimmer is detected, the N lamp strings are controlled to be conducted simultaneously; and when the AC input is detected not to be connected with a dimmer, controlling the N lamp strings to be respectively conducted according to the rectified voltage.
The high-voltage end of the rectified voltage is connected to the first end of a first lamp string through a one-way conduction element, the second end of the first lamp string is connected to the reference ground through a first switch module, and the second ends of the 2 nd to N th lamp strings are connected to the 2 nd to N th switch modules through the 2 nd to N th one-way conduction elements respectively;
detecting the rectified voltage, judging whether the alternating current input end is connected with a light modulator or not, and controlling the switch-on of the Nth switch module and the switch-off of the switch modules from 1 st to (N-1) th when the light modulator is detected to be connected; and when the light modulator is not connected, controlling one of the 1 st to N switch modules to be switched on and controlling the rest to be switched off.
And when detecting that the dimmer is not connected, controlling the kth switch module to be switched on and the rest to be switched off when the rectified voltage is in the kth voltage range, wherein k is a natural number from 1 to N.
The 1 st to Nth switch modules are 1 st to Nth MOS, and the grids of the 1 st to Nth MOS are control ends of the 1 st to Nth switch modules.
The lighting circuit comprises N sampling resistors, the first end of the Nth MOS is connected to the reference ground through the Nth sampling resistor, the first ends of the 1 st to (N-1) th MOS are connected to the first end of the Nth MOS through the 1 st to (N-1) th sampling resistors respectively, and the current control circuit receives the voltages of the first ends of the 1 st to N MOS.
When the light modulator is detected to be connected, the first end voltage of the Nth MOS is subjected to operational amplification, and the grid voltage of the Nth MOS is controlled to enable the first end voltage of the Nth MOS to be close to the Nth reference voltage; when the light modulator is detected not to be connected, the first end voltages of the 1 st to N MOS are operated and amplified, and the grid voltages of the 1 st to N MOS are respectively controlled to enable the first end voltages of the 1 st to N MOS to be close to the 1 st to N reference voltages.
In addition, although the embodiments are described and illustrated separately, it will be apparent to those skilled in the art that some common techniques may be substituted and integrated between the embodiments, and reference may be made to one of the embodiments without explicit mention.
The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.
Claims (10)
1. A control circuit for a lighting circuit, characterized by: the alternating current input is rectified to obtain rectified voltage, wherein a low potential end of the rectified voltage is used as a reference ground, a load of the lighting circuit is formed by connecting N lamp strings in series, N is a natural number which is more than or equal to 2, when the control circuit detects that the alternating current input is connected with a dimmer, the N lamp strings are controlled to be conducted simultaneously, and the command current or the command voltage of the control circuit is first command current or first command voltage; when the control circuit detects that the AC input is not connected with the light modulator, the N light strings are controlled to be respectively conducted according to the rectified voltage, the instruction current or the instruction voltage of the control circuit is a second instruction current or a second instruction voltage,
the control circuit comprises a voltage detection circuit and a current control circuit, wherein two input ends of the voltage detection circuit are respectively connected to a high potential end and a low potential end of the rectified voltage, and the current control circuit receives the output voltage of the voltage detection circuit;
the voltage detection circuit detects the rectified voltage and judges whether the alternating current input end is connected with a light modulator, and when the fact that the alternating current input end is connected with the light modulator is detected, the current control circuit controls the N light strings to be conducted simultaneously; and when the light modulator is not connected, the current control circuit controls the N light strings to be respectively conducted according to the output of the voltage detection circuit and the rectified voltage.
2. The control circuit of the lighting circuit according to claim 1, wherein: the high-voltage end of the rectified voltage is connected to the first end of a first lamp string through a one-way conduction element, the second end of the first lamp string is connected to a reference ground through a first switch module, the second ends of 2 nd to N th lamp strings are connected to 2 nd to N th switch modules through 2 nd to N th one-way conduction elements respectively, and the output voltage of the current control circuit is connected to the control ends of the 1 st to N th switch modules;
the voltage detection circuit detects the rectified voltage and judges whether the alternating current input end is connected with a light modulator or not, and when the fact that the alternating current input end is connected with the light modulator is detected, the current control circuit controls the Nth switch module to be switched on and controls the 1 st to (N-1) th switch modules to be switched off; when the light modulator is not connected, the current control circuit controls one of the 1 st to N-th switch modules to be switched on and controls the rest to be switched off according to the output of the voltage detection circuit.
3. The control circuit of the lighting circuit according to claim 2, wherein: when the voltage detection circuit detects that the dimmer is not connected, and when the rectified voltage is in a kth voltage range, the current control circuit controls the kth switch module to be switched on and other switch modules to be switched off, wherein k is a natural number from 1 to N.
4. The control circuit of the lighting circuit according to claim 2, wherein: the first instruction current or the first instruction voltage is greater than or equal to the second instruction current or the second instruction voltage.
5. The control circuit of the lighting circuit according to claim 2, wherein: the 1 st to N switch modules are 1 st to N MOS, and the grid electrodes of the 1 st to N MOS are the control ends of the 1 st to N switch modules.
6. A method of controlling a lighting circuit, comprising: the method comprises the steps that alternating current input is rectified to obtain rectified voltage, wherein a low-potential end of the rectified voltage serves as a reference ground, a load of the lighting circuit is formed by connecting N lamp strings in series, N is a natural number which is greater than or equal to 2, when the fact that the alternating current input is connected into a dimmer is detected, the N lamp strings are controlled to be conducted simultaneously, and the command current or the command voltage is first command current or first command voltage; when detecting that the AC input is not connected with the dimmer, controlling the N lamp strings to be respectively conducted according to the rectified voltage, wherein the instruction current or the instruction voltage is a second instruction current or a second instruction voltage,
detecting the rectified voltage, judging whether the alternating current input end is connected with a light modulator or not, and controlling the N light strings to be conducted simultaneously when the fact that the alternating current input end is connected with the light modulator is detected; and when the light modulator is not connected, the current control circuit controls the N light strings to be respectively conducted according to the output of the voltage detection circuit and the rectified voltage.
7. The control method of the lighting circuit according to claim 6, wherein: the high-voltage end of the rectified voltage is connected to the first end of the first lamp string through the one-way conduction element, the second end of the first lamp string is connected to the reference ground through the first switch module, and the second ends of the 2 nd to N th lamp strings are connected to the 2 nd to N th switch modules through the 2 nd to N th one-way conduction elements respectively.
8. The control method of the lighting circuit according to claim 7, wherein: when the fact that the light modulator is not connected is detected, when the rectified voltage is within a kth voltage range, the kth switch module is controlled to be connected, and the rest of the kth switch module is controlled to be disconnected, wherein k is a natural number ranging from 1 to N.
9. The control method of the lighting circuit according to claim 7, wherein: the 1 st to N switch modules are 1 st to N MOS, and the grid electrodes of the 1 st to N MOS are the control ends of the 1 st to N switch modules.
10. A lighting circuit, characterized by: comprising a control circuit according to any of claims 1-5.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2018104342788 | 2018-05-08 | ||
| CN201810434278 | 2018-05-08 |
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| Publication Number | Publication Date |
|---|---|
| CN109757008A CN109757008A (en) | 2019-05-14 |
| CN109757008B true CN109757008B (en) | 2021-06-18 |
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Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
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| CN201910187503.7A Active CN109757008B (en) | 2018-05-08 | 2019-03-13 | Control circuit and control method of lighting circuit and lighting circuit |
| CN201910229915.2A Active CN110035575B (en) | 2018-05-08 | 2019-03-25 | Control circuit and control method of lighting circuit and lighting circuit |
| CN201910366034.5A Active CN110198582B (en) | 2018-05-08 | 2019-04-30 | Control circuit and control method of lighting circuit and lighting circuit |
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| CN201910366034.5A Active CN110198582B (en) | 2018-05-08 | 2019-04-30 | Control circuit and control method of lighting circuit and lighting circuit |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201758472U (en) * | 2010-03-19 | 2011-03-09 | 技领半导体(上海)有限公司 | LED lighting string circuit containing long strings connected by a plurality of short strings |
| CN102665324A (en) * | 2012-04-12 | 2012-09-12 | 上海晶丰明源半导体有限公司 | LED linear driving circuit applicable to thyristor dimmer and control method |
| CN103561509A (en) * | 2013-10-17 | 2014-02-05 | 易美芯光（北京）科技有限公司 | LED drive circuit structure with separated switching tube |
| CN104582140A (en) * | 2014-12-08 | 2015-04-29 | 深圳市众明半导体照明有限公司 | Linear dimming circuit |
| CN105282929A (en) * | 2015-10-20 | 2016-01-27 | 晨辉光宝科技有限公司 | Full voltage segmented linear constant current LED drive circuit capable of switching modes automatically |
| CN105325061A (en) * | 2013-06-28 | 2016-02-10 | 硅工厂股份有限公司 | LED lighting apparatus and control circuit thereof |
| CN106132030A (en) * | 2016-08-18 | 2016-11-16 | 杰华特微电子（杭州）有限公司 | A kind of illumination driving circuit and illuminator |
| CN106455191A (en) * | 2015-08-13 | 2017-02-22 | 硅工厂股份有限公司 | Lighting apparatus |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI580305B (en) * | 2008-09-05 | 2017-04-21 | 艾杜雷控股有限公司 | Led based lighting application |
| JP2010218811A (en) * | 2009-03-16 | 2010-09-30 | Toshio Takahashi | Led lighting circuit |
| CN102186282B (en) * | 2011-03-21 | 2013-11-27 | 中国航天科技集团公司第九研究院第七七一研究所 | Drive circuit capable of improving power factors of alternating current light emitting diode (AC LED) lamp |
| CN202602987U (en) * | 2012-04-12 | 2012-12-12 | 上海晶丰明源半导体有限公司 | LED linear driving circuit suitable for silicon controlled light modulator |
| CN102858062A (en) * | 2012-08-22 | 2013-01-02 | 深圳市明微电子股份有限公司 | Light emitting diode (LED) control circuit and LED illuminating device |
| TWM485583U (en) * | 2014-05-16 | 2014-09-01 | Unity Opto Technology Co Ltd | Resistot type light adjusting circuit |
| CN104020377A (en) * | 2014-06-13 | 2014-09-03 | 成都芯源系统有限公司 | LED driving device, controller thereof and dimming mode detection method |
| JP6396793B2 (en) * | 2014-12-26 | 2018-09-26 | ニチコン株式会社 | Switching power supply circuit |
| KR102453820B1 (en) * | 2015-08-21 | 2022-10-17 | 서울반도체 주식회사 | Driving circuit and lighting apparatus for light emitting diode |
| CN110035576A (en) * | 2015-11-12 | 2019-07-19 | 台湾快捷国际股份有限公司 | LED drive |
| US10362643B2 (en) * | 2016-07-07 | 2019-07-23 | Semiconductor Components Industries, Llc | LED driver circuit and LED driving method |
| CN106793317B (en) * | 2016-12-30 | 2018-12-14 | 杰华特微电子（杭州）有限公司 | Light adjusting circuit, light-dimming method and LED drive circuit |
| CN206365087U (en) * | 2016-12-30 | 2017-07-28 | 杰华特微电子（杭州）有限公司 | Light adjusting circuit and LED drive circuit |
| CN206542605U (en) * | 2017-03-17 | 2017-10-03 | 厦门方光电子科技有限公司 | Multifunctional LED dims Dolby circuit and LED dimming power sources |
-
2019
- 2019-03-13 CN CN201910187503.7A patent/CN109757008B/en active Active
- 2019-03-25 CN CN201910229915.2A patent/CN110035575B/en active Active
- 2019-04-30 CN CN201910366034.5A patent/CN110198582B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201758472U (en) * | 2010-03-19 | 2011-03-09 | 技领半导体(上海)有限公司 | LED lighting string circuit containing long strings connected by a plurality of short strings |
| CN102665324A (en) * | 2012-04-12 | 2012-09-12 | 上海晶丰明源半导体有限公司 | LED linear driving circuit applicable to thyristor dimmer and control method |
| CN105325061A (en) * | 2013-06-28 | 2016-02-10 | 硅工厂股份有限公司 | LED lighting apparatus and control circuit thereof |
| CN103561509A (en) * | 2013-10-17 | 2014-02-05 | 易美芯光（北京）科技有限公司 | LED drive circuit structure with separated switching tube |
| CN104582140A (en) * | 2014-12-08 | 2015-04-29 | 深圳市众明半导体照明有限公司 | Linear dimming circuit |
| CN106455191A (en) * | 2015-08-13 | 2017-02-22 | 硅工厂股份有限公司 | Lighting apparatus |
| CN105282929A (en) * | 2015-10-20 | 2016-01-27 | 晨辉光宝科技有限公司 | Full voltage segmented linear constant current LED drive circuit capable of switching modes automatically |
| CN106132030A (en) * | 2016-08-18 | 2016-11-16 | 杰华特微电子（杭州）有限公司 | A kind of illumination driving circuit and illuminator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110035575B (en) | 2021-05-14 |
| CN110198582B (en) | 2021-08-31 |
| CN109757008A (en) | 2019-05-14 |
| CN110198582A (en) | 2019-09-03 |
| CN110035575A (en) | 2019-07-19 |
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