CN210143136U - High power factor LED linear constant current control circuit - Google Patents
High power factor LED linear constant current control circuit Download PDFInfo
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- CN210143136U CN210143136U CN201920186619.4U CN201920186619U CN210143136U CN 210143136 U CN210143136 U CN 210143136U CN 201920186619 U CN201920186619 U CN 201920186619U CN 210143136 U CN210143136 U CN 210143136U
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The utility model provides a high power factor LED linear constant current control circuit, which comprises a rectifier module, a capacitor element C, at least two branch linear constant current circuits, an active power factor correction circuit and a branch control circuit; the at least two branch linear constant current circuits are configured to provide constant current for the LED light source; the active power factor correction circuit is configured to correct the triangular wave current rectified by the rectifying module into sine wave current and provide the sine wave current to the branch control circuit; and the branch control circuit is configured to detect the current of the at least two branch linear constant current circuits, and switch the branch control state if the detected current value reaches a preset current value, so that after the current value of the linear constant current circuit reaches a preset current range, the switched branch control state is used for controlling the switching state of the at least two branch linear constant current circuits, and the switching state of the LED light source is controlled. The embodiment of the utility model provides an use in input power is greater than 25W's lamps and lanterns, also can satisfy the national standard requirement about harmonic current emission restriction.
Description
Technical Field
The utility model relates to the field of lighting technology, especially, relate to a linear constant current control circuit of high power factor LED.
Background
According to the standard requirement of national 'GB 17625.1-2003 harmonic current emission limit (equipment current is not more than 16A)', harmonic requirements exist for lamps with input power more than 25W under rated input voltage. Because the voltage of the power grid is 50Hz alternating current, after rectification and filtration through the rectifier bridge and the large-capacity capacitor, the input current is not sine wave but triangular wave, for example, fig. 1a is the voltage waveform of the sine wave of the power grid, fig. 1b is the triangular wave of the sine wave of the power grid after rectification and filtration through the rectifier bridge, and the harmonic content of the triangular wave is very high, so that the standard requirement cannot be met.
With the development of high-voltage LEDs and linear constant current technologies, the costs of high-voltage LEDs and linear constant currents are continuously reduced, and in order to save production costs, more and more linear constant current circuits are adopted in the constant current circuits of the lamps, and when the lamps are controlled by the linear constant current circuits, the lamps smaller than 25W are usually limited to be switched and controlled, and the lamps cannot be well adapted to the lamps larger than 25W.
SUMMERY OF THE UTILITY MODEL
In view of the above problem, the present invention has been made to provide a high power factor LED linear constant current control circuit that overcomes or at least partially solves the above problems, including a rectifier module, a capacitor element C, at least two branch linear constant current circuits, an active power factor correction circuit, and a sub-control circuit;
the at least two branch linear constant current circuits are respectively and correspondingly connected with the at least two paths of LED light sources and are configured to provide constant current for the at least two paths of LED light sources;
the active power factor correction circuit is respectively connected with the sub-control circuit and the rectifying module, and is configured to correct the triangular wave current rectified by the rectifying module into sine wave current which is provided for the sub-control circuit;
the branch control circuit is configured to detect currents of the at least two branch linear constant current circuits and preset at least two branch control states, if the detected current value reaches a preset current value, the current branch control state is switched to the next branch control state, and after the current value of the linear constant current circuit reaches a preset current range, the switched branch control state is used for controlling the switching states of the at least two branch linear constant current circuits so as to control the switching state of the LED light source.
Optionally, the at least two branch linear constant current circuits include a first branch linear constant current circuit and a second branch linear constant current circuit, and two branch control states are preset in the branch control circuit;
the two branch control states are respectively controlling the first branch linear constant current circuit to be opened and the second branch linear constant current circuit to be disconnected, and controlling the first branch linear constant current circuit to be disconnected and the second branch linear constant current circuit to be opened.
Optionally, four branch control states are preset in the branch control circuit,
the first to fourth branch control states of the four branch control states are respectively as follows: controlling a first branch linear constant current circuit and a second branch linear constant current circuit to be opened, controlling the first branch linear constant current circuit to be opened and the second branch linear constant current circuit to be disconnected, controlling the first branch linear constant current circuit to be disconnected and the second branch linear constant current circuit to be opened, and controlling the first branch linear constant current circuit and the second branch linear constant current circuit to be disconnected;
if the current value detected by the branch control circuit reaches a preset current value, the current branch control state is switched to the next branch control state, and after the current value of the linear constant current circuit reaches a preset current range, the switched branch control state is used for controlling the switching state of the corresponding linear constant current circuit, so that the branch control circuit sequentially and circularly executes four branch control states to control the switching state of the corresponding linear constant current circuit.
Optionally, the method further comprises:
one end of the sampling resistor R1 is connected with the input ends of the rectifying module and the active power factor correction circuit, and the other end of the sampling resistor R1 is connected with the branch control circuit;
the sub-control circuit is further configured to sample a voltage value obtained after rectification by the rectification module through the sampling resistor R1, and switch the sub-control state of the sub-control circuit if the sampled voltage value reaches a preset voltage value.
Optionally, the active power factor correction circuit comprises any one of: the Boost circuit, Flyback circuit and BUCK-Boost circuit.
Optionally, the rectifier module comprises: the rectifier bridge is provided with an input end and an output end, the input end of the rectifier bridge is connected with an external power supply, the output end of the rectifier bridge is connected with the active power factor correction circuit, and the rectifier bridge is configured to rectify a current signal provided by the external power supply and provide the rectified current signal to the active power factor correction circuit.
Optionally, the method further comprises:
and one end of the capacitor element C1 is connected with the branch control circuit, the other end of the capacitor element C1 is grounded, and the capacitor element C1 is configured to provide working voltage for the branch control circuit when the current of the at least two branch linear constant current circuits reaches the preset current value.
Optionally, the sub-control circuit is integrated in an IC chip, the IC chip includes a power pin Vin, a power pin VCC, a ground pin GND, and at least two detection sub-control pins, wherein,
the at least two detection sub-control pins are respectively connected with the at least two branch linear constant current circuits, the power supply pin Vin is connected with the active power factor correction circuit, the power supply pin VCC is connected with the capacitor element C1, and the grounding pin GND is grounded.
Optionally, the number of the sub-control circuits is two, each sub-control circuit is integrated in one IC chip, and the two integrated IC chips are connected in parallel.
Optionally, the circuit further comprises at least two resistors configured to set a maximum constant current value for the at least two branch linear constant current circuits;
the branch control circuit and the at least two branch linear constant current circuits are integrated in an IC chip, the IC chip comprises a sampling pin DIM, at least two detection branch control pins, at least two enable pins, a power supply pin Vin and a grounding pin GND, and the sampling pin DIM is connected with the sampling resistor R1; the at least two detection sub-control pins are respectively and correspondingly connected with the at least two paths of LED light sources; the at least two enable pins are respectively and correspondingly connected with the at least two resistors; the power supply pin Vin is connected with the active power factor correction circuit, and the grounding pin GND is grounded.
Optionally, the method further comprises: the dimming control circuit is provided with a wireless communication module, the dimming control circuit is respectively connected with the at least two branch linear constant current circuits and is configured to be adopted, the wireless communication module receives an external control signal, the external control signal is converted into at least two paths of PWM dimming control signals, and the current of the corresponding branch linear constant current circuits is adjusted by utilizing the PWM dimming control signals, so that the at least two paths of LED light sources are respectively dimmed.
Optionally, the wireless communication module includes any one of a 2.4G-RF module, a WiFi module, and a bluetooth module.
The embodiment of the utility model provides an in, through set up active power factor correction circuit in linear constant current circuit to utilize active power factor correction circuit to rectify the higher triangle wave current of harmonic content after the rectifier module rectification into sine wave current, thereby can be fine be greater than 25W's lamps and lanterns in input power, not only satisfied the national standard requirement about harmonic current emission restriction, still make the output voltage of circuit more stable. In addition, the on-off of the multi-path linear constant current circuit can be conveniently and quickly controlled by arranging the branch control circuit, so that the on-off state of a multi-path light source is effectively controlled, and further, various light emitting effects of the lamp are realized.
The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the present invention is given.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1a shows a prior art grid sine wave voltage waveform schematic;
FIG. 1b is a schematic diagram of a triangular wave of a sine wave of a power grid after rectification and filtration by a rectifier bridge in the prior art;
fig. 2a is a schematic circuit diagram of a linear constant current circuit according to an embodiment of the present invention after an active power factor correction circuit is added;
fig. 2b is a schematic circuit diagram of a linear constant current circuit according to another embodiment of the present invention after an active power factor correction circuit is added;
fig. 3 shows a schematic diagram of a high power factor LED linear constant current control circuit according to an embodiment of the present invention;
fig. 4 shows a schematic diagram of a high power factor LED linear constant current control circuit according to another embodiment of the present invention;
fig. 5 shows a schematic diagram of a high power factor LED linear constant current control circuit according to yet another embodiment of the present invention;
fig. 6 shows a schematic diagram of a high power factor LED linear constant current control circuit according to yet another embodiment of the present invention; and
fig. 7 shows a schematic diagram of a high power factor LED linear constant current control circuit according to yet another embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
For solving above-mentioned technical problem to make the lamps and lanterns that are greater than 25W also can adopt linear constant current circuit to carry out the constant current under the prerequisite that satisfies the national standard requirement about harmonic current emission restriction, and practice thrift the lamps and lanterns cost, see that fig. 2a shows, the embodiment of the utility model provides a can increase active power factor correction circuit 1 in linear constant current circuit 2, correct the triangle wave current of input into sine wave current through active power factor correction circuit 1, and can improve the power factor of circuit effectively. The utility model discloses active power factor correction circuit 1 can connect all the way or the linear constant current circuit 2 of multichannel at the back. As shown in fig. 2b, the active power factor correction circuit 1 is connected to a plurality of linear constant current circuits 2, and each linear constant current circuit 2 is connected to a group of LED light sources, each group of LED light sources may include a plurality of LEDs connected in series.
The embodiment of the utility model provides an adopt the integrated control circuit of high accuracy, active power factor correction circuit 1 can make the voltage of circuit output very stable promptly, the embodiment of the utility model provides a pressure drop V of LED light source on every branch road can also be selected as far as possibleLEDAs close as possible to the voltage output by the active power factor correction circuit 1 so that the loss of the linear constant current circuit 2 is very low.
Based on the above analysis, the utility model provides a linear constant current control circuit of high power factor LED, see fig. 3, the linear constant current control circuit of high power factor LED includes rectifier module (as shown in fig. 3 rectifier bridge DB), capacitive element C, the linear constant current circuit 2 of two at least branch roads, active power factor correction circuit 1, divides control circuit 3.
The at least two branch linear constant current circuits 2 are respectively and correspondingly connected with the at least two paths of LED light sources and are configured to provide constant current for the LED light sources. The linear constant current circuit 2 of one branch may include one linear constant current circuit 2, or may include a plurality of parallel linear constant current circuits 2. Each linear constant current circuit 2 is connected in series with a group of LED light sources, and each group of LED light sources may include a plurality of LEDs connected in series.
The active power factor correction circuit 1 is connected with the sub-control circuit 3 and the rectifier module respectively, and is configured to correct the triangular wave current rectified by the rectifier module into a sine wave current, and provide the sine wave current to the sub-control circuit 3.
And the branch control circuit 3 is configured to detect the current of the at least two branch linear constant current circuits 2, preset at least two branch control states, and switch from the current branch control state to the next branch control state if the detected current value reaches the preset current value. When the current values of the at least two branch linear constant current circuits 2 reach a preset current range, the branch control circuit 3 controls the on-off state of the at least two branch linear constant current circuits 2 by using the switched branch control state to control the on-off state of the LED light source.
The embodiment of the utility model provides an in, through set up active power factor correction circuit in linear constant current circuit to utilize active power factor correction circuit to rectify the higher triangle wave current of harmonic content after the rectifier module rectification into sine wave current, thereby can be fine be greater than 25W's lamps and lanterns in input power, not only satisfied the national standard requirement about harmonic current emission restriction, still make the output voltage of circuit more stable. In addition, the on-off of the multi-path linear constant current circuit can be conveniently and quickly controlled by arranging the branch control circuit, so that the on-off state of a multi-path light source is effectively controlled, and further, various light emitting effects of the lamp are realized.
Continuing to refer to fig. 3, in the utility model discloses an embodiment, rectifier module can adopt rectifier bridge DB, and rectifier bridge DB has input and output, and external power supply (not shown in the figure) is connected to rectifier bridge DB's input, and active power factor correction circuit 1 is connected to the output, and rectifier bridge DB can configure into and carry out the rectification to the current signal that external power supply provided, and then provides the current signal after the rectification to active power factor correction circuit 1. Further, F shown in fig. 3 is a fuse.
The embodiment of the utility model provides an in, active power factor correction circuit 1 generally can adopt topological structure Boost circuit, also can be Flyback circuit, can also be the topological circuit that BUCK-Boost circuit etc. can realize active power factor correction, and concrete injecing is not done to the type of active power factor correction circuit 1 to the embodiment of the invention.
Taking fig. 3 as an example, the working principle of the sub-control circuit 3 in the embodiment of the present invention will be described in detail. In order to describe the working principle of the sub-control circuit 3 more clearly, the connection ends of the sub-control circuit 3 and other circuits are labeled, and the linear constant current circuits 2 of the two branches shown in fig. 3 are respectively connected to the OUT1 end and the OUT2 end of the sub-control circuit 3, that is, the sub-control circuit 3 realizes two-way sub-control. In the embodiment of the invention, two branch control states can be preset in the branch control circuit, wherein the two branch control states are respectively to control the opening of one linear constant current circuit connected to the OUT1 end and the opening of one linear constant current circuit connected to the OUT2 end, and to control the opening of one linear constant current circuit connected to the OUT1 end and the opening of one linear constant current circuit connected to the OUT2 end.
The embodiment of the utility model provides an in still include switching element 4, it connects external power supply and rectifier module respectively, and after switching element 4 disconnection, electric capacity C stored electric energy can descend rapidly, can only maintain about bright 0.1 second of LED light source, and at this moment, branch accuse circuit 3 also descends rapidly through OUT1 end and OUT2 end two branch road linear constant current circuit's that detect electric current, and is 0 up to the electric current. When the current value detected by the sub-control circuit 3 reaches the preset current value, the sub-control state of the sub-control circuit is switched, that is, the current sub-control state is switched to the next sub-control state. Here, the preset current value may be a small current value or may be a 0 value.
In an embodiment of the present invention, four sub-control states are preset in the sub-control circuit 3, and the four sub-control states are, according to the control sequence, respectively to control the OUT1 end and the OUT2 end to be both turned on, the OUT1 end to be turned on, the OUT2 end to be turned off, the OUT1 end to be turned off, the OUT2 end to be turned on, and the OUT1 end and the OUT2 end to be turned off. Assuming that the current LED light sources connected to each branch linear constant current circuit 2 are all bright, that is, the OUT1 terminal and the OUT2 are both turned on, after the switching element 4 is turned off, the sub-control circuit 3 switches the sub-control state to "control the OUT1 terminal to be turned on and the OUT2 terminal to be turned off", further, after the switching element 4 is turned on again, the current in the linear constant current circuit 2 increases and reaches a preset current range, at this time, the sub-control circuit 3 controls the OUT1 terminal to be turned on and the OUT2 terminal to be turned off, that is, the sub-line linear constant current circuit 2 connected to the OUT1 terminal is controlled to be turned on, and the sub-line linear constant current circuit 2 connected to the OUT2 terminal is controlled to be turned off, so that the LED light source corresponding to the OUT1 terminal is bright. The preset current range refers to a corresponding current range on the linear constant current circuit 2 when the circuit normally works.
When the switch element 4 is turned off again, the sub-control circuit 3 is switched to the next sub-control state, and when the switch element 4 is turned on again, the sub-control circuit 3 respectively controls the on-off states of the LED light sources according to the current sub-control state, and the on-off states are circulated in sequence. The above functions are only examples, and the present embodiment does not limit the related sub-control functions.
Therefore, if the current value detected by the sub-control circuit 3 reaches 0, the current sub-control state is switched to the next sub-control state, and after the current value of the linear constant current circuit reaches the preset current range, the switched sub-control state is used for controlling the switching state of the corresponding linear constant current circuit, so that the sub-control circuit 3 sequentially and circularly executes the four sub-control states to control the switching state of the corresponding linear constant current circuit.
Referring to fig. 3, the embodiment of the present invention may further include a capacitor element C1, one end of which is connected to the sub-control circuit 3, and the other end of which is grounded. The capacitance element C1 has a large enough capacity, and is configured to provide a working voltage for the sub-control circuit 3 when the current of the at least two branch linear constant current circuits 2 reaches a preset current value, that is, after the switching element 4 is turned off, the sub-control circuit 3 can be ensured to continue to work for a period of time, and the maintenance time is generally about 3 seconds.
Referring to fig. 4, in an embodiment of the present invention, the present invention may further include a sampling resistor R1, one end of which is connected to the input terminals of the rectifier module and the active power factor correction circuit 1, and the other end of which is connected to the sub-control circuit 3. The sub-control circuit 3 may also be configured to sample a voltage value obtained after rectification by the rectifier module through the sampling resistor R1, switch the sub-control state if the sampled voltage value reaches a preset voltage value, and control the switching state of the at least two branch linear constant current circuits by using the switched sub-control state after the voltage value sampled by the sub-control circuit 3 through the sampling resistor R1 reaches a preset voltage range. In this embodiment, the preset voltage value may be a small voltage value, or may be a 0 value. The preset voltage range refers to a voltage range obtained after rectification by the rectification module when the circuit normally works.
In this embodiment, the power factor correction circuit further includes a diode D1, the anode of which is connected to the active power factor correction circuit 1, and the cathode of which is connected to the capacitive element C. After the switching element 4 is switched off, the voltage rectified by the rectifying module can be rapidly reduced, the voltage is reduced slowly due to the large capacitance of the capacitor element C, and the diode D1 is cut off reversely, so that the voltage rectified by the rectifying module is sampled by the sampling resistor R1, the sub-control state of the sub-control circuit 3 can be switched more rapidly, and the voltage of the capacitor element C can be effectively prevented from influencing the timely switching of the sub-control state by the sub-control circuit 3.
Referring to fig. 5, in an embodiment of the present invention, the sub-control circuit can be integrated in an IC chip to obtain a sub-control IC, the sub-control IC includes a power pin Vin, a power supply pin VCC, a ground pin GND, and at least two sub-control pins for detection, wherein at least two sub-control pins for detection correspond to and are connected to at least two branch linear constant current circuits respectively, the number of sub-control pins for detection is the same as the number of branches of the linear constant current circuits, and three sub-control pins for detection (OUT1, OUT2, and OUT3) are shown in fig. 5. The power supply pin Vin is connected to the active power factor correction circuit 1 through a diode D1, the power supply pin VCC is connected to one end of the capacitor element C1, and the ground pin GND is grounded.
In an embodiment of the present invention, in order to ensure the reliable operation of the branch control circuit 3, a plurality of branch control circuits 3 can be further disposed in a high power factor LED linear constant current control circuit, and a plurality of branch control circuits 3 are connected in parallel, and at this time, the number of the capacitor element C1 is also corresponding to the number of the branch control circuits 3. For example, referring to fig. 6, two sub-control circuits and two capacitive elements (i.e., capacitive elements C1 and C2) are included, and each sub-control circuit is integrated in one IC chip, and the two integrated sub-control ICs are connected in parallel.
Referring to fig. 7, in an embodiment of the present invention, the sub-control circuit (not shown in fig. 7) and the at least two branch linear constant current circuits (not shown in fig. 7) can be integrated into one IC chip, and the IC chip includes a sampling pin DIM, at least two detection sub-control pins, at least two enable pins, a power pin Vin, a power supply pin VCC, and a ground pin GND. Because the IC chip of fig. 7 integrates a branch control circuit and two branch linear constant current circuits, fig. 7 shows two detection branch control pins (OUT1 and OUT2), and two enable pins (CS1 and CS 2).
The embodiment of the utility model provides a still include two at least resistances, the configuration is for setting for the linear constant current circuit of two at least branch roads maximum constant current value. The number of the at least two resistors corresponds to the number of branches of the linear constant current circuit, and the linear constant current circuit 2 of two branches is shown in fig. 7, and thus the resistor R3 and the resistor R4 are provided.
In this embodiment, the enable pin CS1 is connected to the resistor R3, the enable pin CS2 is connected to the resistor R4, the sensing sub-control pin OUT1 is connected to the LED light source of one branch, and the sensing sub-control pin OUT2 is connected to the LED light source of the other branch. The sampling pin DIM is connected to a sampling resistor R1. The power supply pin Vin is connected to the active power factor correction circuit 1 through a diode D1, and the ground pin GND is grounded. The supply pin VCC is connected to one end of the capacitive element C1.
In the embodiment, the sub-control circuit and the at least two branch linear constant current circuits are integrated in one IC chip, so that the field effect transistor or the triode and other elements in the sub-control circuit and the linear constant current circuits can share one set, thereby effectively saving circuit element resources and further reducing the production cost of the lamp.
In an embodiment of the present invention, the high power factor LED linear constant current control circuit may further include a dimming control circuit (not shown in the figure), the dimming control circuit has a wireless communication module, the dimming control circuit is connected to the at least two branch linear constant current circuits, the wireless communication module may be adopted to receive an external control signal, convert the external control signal into at least two paths of PWM dimming control signals, and adjust the current of the corresponding branch linear constant current circuit by using each path of PWM dimming control signal, so as to dim the at least two paths of LED light sources respectively.
In this embodiment, the wireless communication module includes any one of a 2.4G-RF module, a WiFi module, and a bluetooth module. When the wireless communication module adopts the 2.4G-RF module, the external device may adopt a remote controller, that is, the remote controller transmits the external control signal to the 2.4G-RF module of the dimming control circuit 3 according to a preset transmission protocol. When the wireless communication module adopts a WIFI module or a Bluetooth module, the external device can adopt a mobile phone, and a special APP is installed on the mobile phone, so that the mobile phone APP is used for sending an external control signal to the WIFI module or the Bluetooth module of the dimming control circuit 3, and when the mobile phone sends the external control signal to the WIFI module of the dimming control circuit 3, the mobile phone also needs to be connected with a wireless network. In addition, the sending and receiving modes of the external control signal are not limited to the above several modes, and other modes can be used for sending or receiving, for example, network voice control (such as a makita sprite) and the like can be designed.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments can be modified or some or all of the technical features can be equivalently replaced within the spirit and principle of the present invention; such modifications or substitutions do not depart from the scope of the present invention.
Claims (12)
1. A high power factor LED linear constant current control circuit is characterized by comprising a rectification module, a capacitance element C, at least two branch linear constant current circuits, an active power factor correction circuit and a branch control circuit;
the at least two branch linear constant current circuits are respectively and correspondingly connected with the at least two paths of LED light sources and are configured to provide constant current for the at least two paths of LED light sources;
the active power factor correction circuit is respectively connected with the sub-control circuit and the rectifying module, and is configured to correct the triangular wave current rectified by the rectifying module into sine wave current which is provided for the sub-control circuit;
the branch control circuit is configured to detect currents of the at least two branch linear constant current circuits and preset at least two branch control states, if the detected current value reaches a preset current value, the current branch control state is switched to the next branch control state, and after the current value of the linear constant current circuit reaches a preset current range, the switched branch control state is used for controlling the switching states of the at least two branch linear constant current circuits so as to control the switching state of the LED light source.
2. The high power factor LED linear constant current control circuit according to claim 1, wherein the at least two branch linear constant current circuits comprise a first branch linear constant current circuit and a second branch linear constant current circuit, and two branch control states are preset in the branch control circuit;
the two branch control states are respectively controlling the first branch linear constant current circuit to be opened and the second branch linear constant current circuit to be disconnected, and controlling the first branch linear constant current circuit to be disconnected and the second branch linear constant current circuit to be opened.
3. The linear constant-current control circuit for the high-power-factor LED according to claim 2, wherein four sub-control states are preset in the sub-control circuit,
the first to fourth branch control states of the four branch control states are respectively as follows: controlling a first branch linear constant current circuit and a second branch linear constant current circuit to be opened, controlling the first branch linear constant current circuit to be opened and the second branch linear constant current circuit to be disconnected, controlling the first branch linear constant current circuit to be disconnected and the second branch linear constant current circuit to be opened, and controlling the first branch linear constant current circuit and the second branch linear constant current circuit to be disconnected;
if the current value detected by the branch control circuit reaches a preset current value, the current branch control state is switched to the next branch control state, and after the current value of the linear constant current circuit reaches a preset current range, the switched branch control state is used for controlling the switching state of the corresponding linear constant current circuit, so that the branch control circuit sequentially and circularly executes four branch control states to control the switching state of the corresponding linear constant current circuit.
4. The high power factor LED linear constant current control circuit according to any one of claims 1-3, further comprising:
one end of the sampling resistor R1 is connected with the input ends of the rectifying module and the active power factor correction circuit, and the other end of the sampling resistor R1 is connected with the branch control circuit;
the sub-control circuit is further configured to sample a voltage value obtained after rectification by the rectification module through the sampling resistor R1, and switch the sub-control state of the sub-control circuit if the sampled voltage value reaches a preset voltage value.
5. The high power factor LED linear constant current control circuit according to any one of claims 1-3, wherein the active power factor correction circuit comprises any one of:
the Boost circuit, Flyback circuit and BUCK-Boost circuit.
6. The high power factor LED linear constant current control circuit according to any one of claims 1-3, wherein the rectifying module comprises:
the rectifier bridge is provided with an input end and an output end, the input end of the rectifier bridge is connected with an external power supply, the output end of the rectifier bridge is connected with the active power factor correction circuit, and the rectifier bridge is configured to rectify a current signal provided by the external power supply and provide the rectified current signal to the active power factor correction circuit.
7. The high power factor LED linear constant current control circuit according to any one of claims 1-3, further comprising:
and one end of the capacitor element C1 is connected with the branch control circuit, the other end of the capacitor element C1 is grounded, and the capacitor element C1 is configured to provide working voltage for the branch control circuit when the current of the at least two branch linear constant current circuits reaches the preset current value.
8. The high power factor LED linear constant current control circuit of claim 7,
the sub-control circuit is integrated in an IC chip, the IC chip comprises a power supply pin Vin, a power supply pin VCC, a grounding pin GND and at least two detection sub-control pins, wherein,
the at least two detection sub-control pins are respectively and correspondingly connected with the at least two branch linear constant current circuits; the power supply pin Vin is connected with the active power factor correction circuit; the power supply pin VCC is connected with the capacitance element C1; the ground pin GND is grounded.
9. The high power factor LED linear constant current control circuit of claim 8,
the branch control circuit comprises two branch control circuits, each branch control circuit is integrated in one IC chip, and the two integrated IC chips are connected in parallel.
10. The high power factor LED linear constant current control circuit according to claim 4, further comprising at least two resistors configured to set a maximum constant current value for the at least two branch linear constant current circuits;
the sub-control circuit and the at least two branch linear constant current circuits are integrated in an IC chip, the IC chip comprises a sampling pin DIM, at least two detection sub-control pins, at least two enable pins, a power supply pin Vin and a grounding pin GND, wherein,
the sampling pin DIM is connected with the sampling resistor R1; the at least two detection sub-control pins are respectively and correspondingly connected with the at least two paths of LED light sources; the at least two enable pins are respectively and correspondingly connected with the at least two resistors; the power supply pin Vin is connected with the active power factor correction circuit, and the grounding pin GND is grounded.
11. The high power factor LED linear constant current control circuit according to claim 1, further comprising:
the dimming control circuit is provided with a wireless communication module, the dimming control circuit is respectively connected with the at least two branch linear constant current circuits and is configured to be adopted, the wireless communication module receives an external control signal, the external control signal is converted into at least two paths of PWM dimming control signals, and the current of the corresponding branch linear constant current circuits is adjusted by utilizing the PWM dimming control signals, so that the at least two paths of LED light sources are respectively dimmed.
12. The high power factor LED linear constant current control circuit of claim 11,
the wireless communication module comprises any one of a 2.4G-RF module, a WiFi module and a Bluetooth module.
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