Light source driving circuit, lighting system and light source driving method for improving power factor

Abstract

A light source driving circuit, lighting system and light source driving method for improving power factor, the light source driving circuit comprising: a rectifier component, at least one energy storage component, a voltage divider component, a first current control component and a second current control component; when a detection voltage is greater than or equal to a starting voltage and less than a second set voltage, a preset current is output to each light-emitting module; when the detection voltage is greater than or equal to the second set voltage, the branch between each light-emitting module and the corresponding energy storage component is controlled to be turned on in sequence, and the preset current is output to the corresponding light-emitting module; when the detection voltage is less than the starting voltage and the energy storage component is in a discharging stage, the discharge current of the energy storage component is controlled to be output to each light-emitting module; the light source driving circuit drives multiple light-emitting modules in sections within one AC cycle, thereby improving the power factor of the light-emitting module.

Description

Technical Field

[0001] The present application belongs to the field of light source driving technology, and in particular, relates to a light source driving circuit, a lighting system and a light source driving method for improving power factor. Background Art

[0002] LED (Light Emitting Diode) can convert electrical energy into light energy. In traditional technology, adaptive wire network input is used to perform constant current linear full voltage control on LED lamps. Although it can meet general application needs, as end customers' requirements for finished power supplies or lamps and cost control become increasingly stringent, power supplies or lamps made based on linear control schemes in traditional technology cannot meet corresponding certification standards once peripheral parameters are appropriately adjusted. For example, after adjusting the LED lamp string voltage of the scheme to increase the overall lamp flux, the LED lamp string voltage is too high, resulting in the power factor not meeting the standard.

[0003] Therefore, when using traditional technology to control the constant current of LED lamps, the power factor of the lamps will not meet the relevant industry certification standards. Summary of the invention

[0004] In view of this, the embodiments of the present application provide a light source driving circuit, a lighting system and a light source driving method for improving the power factor, aiming to solve the problem of low power factor of light fixtures during full voltage control of LED lamps in traditional technical solutions.

[0005] A first aspect of an embodiment of the present application provides a light source driving circuit for improving a power factor, which is connected to a light emitting component, wherein the light emitting component includes at least two light emitting modules cascaded in sequence, and the light source driving circuit includes:

[0006] A rectifier component, connected to the mains, for receiving the AC voltage output by the mains, and rectifying the AC voltage to obtain a DC voltage;

[0007] At least one energy storage component is connected to the rectifying component, one energy storage component is connected to one light-emitting module correspondingly, and each energy storage component is used for charging or discharging;

[0008] A voltage dividing component, connected to the rectifying component, for dividing the DC voltage to obtain a detection voltage;

[0009] a first current control component connected to the rectifying component, the light-emitting component, the voltage dividing component and each of the energy storage components, and configured to output a first preset current to each of the light-emitting modules when the detection voltage is greater than or equal to the starting voltage and less than a first set voltage; and output a second preset current to each of the light-emitting modules when the detection voltage is greater than or equal to the first set voltage and less than a second set voltage; and

[0010] a second current control component connected to the light-emitting component, the voltage-dividing component and at least one of the energy storage components, and configured to control the branch between each of the light-emitting modules and the corresponding energy storage component to be turned on in sequence when the detection voltage is greater than or equal to the second set voltage, and output a third preset current to the corresponding light-emitting module;

[0011] The first current control component is also used to control the discharge current of the energy storage component to be output to each of the light-emitting modules when the detection voltage is less than the start-up voltage and the energy storage component is in the discharge stage.

[0012] In one embodiment, each of the energy storage components comprises:

[0013] A first diode, a second diode and a first capacitor;

[0014] The first end of the first capacitor is connected to the rectifier component and the first current control component, the anode of the first diode and the cathode of the second diode are connected to the second end of the first capacitor, the cathode of the first diode is connected to the second current control component, and the anode of the second diode is connected to the corresponding energy storage component.

[0015] In one embodiment, the voltage dividing component includes:

[0016] A first voltage dividing component, connected to the rectifying component and the first current control component, and configured to divide the DC voltage to obtain the detection voltage; and

[0017] The second voltage dividing component is connected to the rectifying component and the second current control component, and is used for dividing the DC voltage to obtain the detection voltage.

[0018] In one embodiment, the first voltage dividing component includes: a first resistor and a second resistor;

[0019] The second voltage dividing component includes: a third resistor and a fourth resistor;

[0020] The first end of the first resistor is connected to the rectifying component, the second end of the first resistor and the first end of the second resistor are commonly connected to the first current control component, and the second end of the second resistor is used to access the reference voltage;

[0021] The first end of the third resistor is connected to the rectifier component, the second end of the third resistor and the first end of the fourth resistor are commonly connected to the second current control component, and the second end of the fourth resistor is used to access the reference voltage.

[0022] In one embodiment, the first current control component includes:

[0023] A first constant current control chip and a fifth resistor;

[0024] The voltage detection pin of the first constant current control chip is connected to the first voltage dividing component, the power output pin of the first constant current control chip is connected to the first end of the fifth resistor, and the second end of the fifth resistor is connected to the light emitting component;

[0025] The power control pin of the first constant current control chip is connected to the rectifier component and each of the energy storage components.

[0026] In one embodiment, the second current control component includes:

[0027] A second constant current control chip and a sixth resistor;

[0028] The voltage detection pin of the second constant current control chip is connected to the second voltage dividing component, the power output pin of the second constant current control chip is connected to the first end of the sixth resistor, the second end of the sixth resistor is connected to the light-emitting component, and the second constant current control chip includes at least two power control pins, wherein at least one of the power control pins is connected one-to-one with at least one of the energy storage components.

[0029] In one embodiment, the light source driving circuit further includes:

[0030] A flicker elimination component is connected to the light-emitting component, the first current control component and the second current control component, and is used to eliminate the flicker of the light-emitting component.

[0031] In one embodiment, the flicker elimination component includes:

[0032] a seventh resistor and a second capacitor;

[0033] The first end of the seventh resistor and the first end of the second capacitor are connected to the first current control component, the second current control component and the first end of the light-emitting component, and the second end of the seventh resistor and the second end of the second capacitor are connected to the second end of the light-emitting component.

[0034] A second aspect of an embodiment of the present application provides a lighting system, including:

[0035] The light source driving circuit as described above; and

[0036] A light-emitting component, wherein the light-emitting component comprises at least two light-emitting modules cascaded in sequence, and each of the light-emitting modules is connected to the light source driving circuit.

[0037] A third aspect of the embodiments of the present application provides a light source driving method for improving a power factor, which is applied to a light emitting component, wherein the light emitting module includes at least two light emitting modules cascaded in sequence, and the light source driving method includes:

[0038] Connecting an AC voltage and rectifying the AC voltage to obtain a DC voltage;

[0039] Dividing the DC voltage to obtain a detection voltage;

[0040] When the detection voltage is greater than or equal to the start-up voltage and less than the first set voltage, the first preset voltage is output to each of the light-emitting modules; when the detection voltage is greater than or equal to the first set voltage and less than the second set voltage, the second preset current is output to each of the light-emitting modules;

[0041] When the detection voltage is greater than or equal to the second set voltage, the power supply branch of each light-emitting module is controlled to be turned on in sequence, and the third preset current is output to the turned-on light-emitting module, and the energy storage component is controlled to be charged;

[0042] When the detection voltage is less than the start-up voltage and the energy storage component is in a discharge stage, the discharge current of the energy storage component is controlled to be output to each of the light-emitting modules.

[0043] The above-mentioned light source driving circuit can not only combine the first current control component and the second current control component to perform full voltage control on the light-emitting component, but also divide the light-emitting component into multiple light-emitting modules. During the variation cycle of the AC voltage, each light-emitting module is driven separately. The light-emitting component has input power during a variation cycle of the AC power, which effectively improves the power factor of the light-emitting module, and the application range of the light source driving circuit is wider. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0045] Figure 1 A schematic diagram of the structure of a light source driving circuit for improving power factor provided in one embodiment of the present application;

[0046] Figure 2 Another structural schematic diagram of a light source driving circuit for improving power factor provided in one embodiment of the present application;

[0047] Figure 3 A schematic diagram of the circuit structure of an energy storage component provided in one embodiment of the present application;

[0048] Figure 4 A schematic diagram of the structure of a voltage divider component provided in one embodiment of the present application;

[0049] Figure 5 A schematic diagram of the circuit structure of a first voltage dividing component and a second voltage dividing component provided in an embodiment of the present application;

[0050] Figure 6 A schematic diagram of the circuit structure of a first current control component provided in one embodiment of the present application;

[0051] Figure 7 A schematic diagram of the circuit structure of a second current control component provided in one embodiment of the present application;

[0052] Figure 8 Another structural schematic diagram of a light source driving circuit for improving power factor provided in one embodiment of the present application;

[0053] Fig. 9 A schematic diagram of the circuit structure of a flicker elimination component provided in one embodiment of the present application;

[0054] Fig.10 A schematic diagram of the change of the current connected to the light-emitting component is provided for one embodiment of the present application;

[0055] Fig.11 A schematic diagram of the structure of a lighting system provided in one embodiment of the present application;

[0056] Fig.12 A specific flow chart of a light source driving method for improving power factor provided in one embodiment of the present application. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0058] See also Figure 1 and Figure 2, a schematic diagram of the structure of a light source driving circuit 10 for improving power factor provided in an embodiment of the present application, wherein the light source driving circuit 10 is connected to a light emitting module 20, wherein the light emitting module 20 includes at least two light emitting modules cascaded in sequence, and the light source driving circuit 10 performs full voltage control on the light emitting module 20; for ease of explanation, only the part related to the present embodiment is shown, which is described in detail as follows:

[0059] The light source driving circuit 10 comprises: a rectifying component 101 , at least one energy storage component, a voltage dividing component 103 , a first current control component 104 and a second current control component 105 .

[0060] in Figure 1 and Figure 2 The difference is: Figure 1 The light source driving circuit 10 includes an energy storage component 1021, and the light emitting module 20 includes two light emitting modules cascaded in sequence; Figure 2 The light source driving circuit 10 includes at least two energy storage components ( Figure 2 2021, ..., 202M, where M is an integer greater than 1), and the light-emitting module includes at least two light-emitting modules cascaded in sequence ( Figure 2 It is represented by 301, ..., 30N, where N is an integer greater than 1); Figure 1 and attached Figure 2 Provide explanation.

[0061] The rectifier assembly 101 is connected to the mains, and is used to receive the AC voltage output by the mains, and rectify the AC voltage to obtain a DC voltage.

[0062] Optionally, the rectifier assembly 101 includes a rectifier bridge, which realizes the AC-to-DC function of the AC voltage through the rectifier bridge; illustratively, the AC power outputs a 220V AC voltage; the rectifier assembly 101 outputs a DC voltage of a preset amplitude.

[0063] At least one energy storage component is connected to the rectifying component 101, one energy storage component is connected to one light-emitting module correspondingly, and each energy storage component is used for charging or discharging.

[0064] Exemplarily, each energy storage component is connected to a DC voltage, and the DC voltage is used to perform DC charging on the energy storage component, so that each energy storage component stores electricity; and each energy storage component outputs DC power during a discharge phase.

[0065] The voltage dividing component 103 is connected to the rectifying component 101 and is used to divide the DC voltage to obtain a detection voltage.

[0066] The voltage divider component 103 has a preset voltage divider ratio, and divides the DC voltage according to the preset voltage divider ratio; obtains the change of the AC voltage according to the change of the detected voltage, and performs full voltage control on each light-emitting module based on the change of the AC voltage.

[0067] The first current control component 104 is connected to the rectifying component 101, the light-emitting component 20, the voltage dividing component 103 and each energy storage component, and is used to output the first preset current to each light-emitting module when the detection voltage is greater than or equal to the starting voltage and less than the first set voltage; when the detection voltage is greater than or equal to the first set voltage and less than the second set voltage, output the second preset current to each light-emitting module.

[0068] In this embodiment, the first set voltage is smaller than the second set voltage.

[0069] The rectifier component 101 outputs a DC voltage to the first current control component 104. After the first current control component 104 converts the DC voltage, it performs a linear constant current drive on the light-emitting component 20. Optionally, the first set voltage and the second set voltage are both pre-stored by the first current control component 104. When the detection voltage is in different amplitude ranges, the first current control component 104 outputs a specific preset current to each light-emitting module, and each light-emitting module emits a light source.

[0070] Specifically, when the detection voltage is greater than or equal to the starting voltage of the light-emitting component 20, the first current control component 104 enters the working state, and the first current control component 104 drives the light-emitting component 20 with a constant current; wherein the first preset current output by the first current control component 104 is a fixed value.

[0071] Specifically, when the detection voltage is greater than or equal to the first set voltage and less than the second set voltage, the change of the second preset current output by the first current control component 104 is correlated with the change of the AC voltage, for example, the waveform of the second preset current output by the first current control component 104 is interlaced with the waveform of the AC voltage.

[0072] The second current control component 105 is connected to the light-emitting component 20, the voltage dividing component 103 and at least one energy storage component, and is used to control the branch between each light-emitting module and the corresponding energy storage component to be turned on in sequence when the detection voltage is greater than or equal to the second set voltage, and output the third preset current to the corresponding light-emitting module;

[0073] The first current control component 104 is also used to control the discharge current of the energy storage component to be output to each light-emitting module when the detection voltage is less than the start-up voltage and the energy storage component is in the discharge stage.

[0074] For example, when the detection voltage is greater than or equal to the starting voltage and less than the second set voltage, the energy storage component is in the stop stage; when the detection voltage is greater than or equal to the second set voltage, the energy storage component is in the charging stage, the energy storage component is connected to the DC voltage, and DC charging is performed; when the energy storage component is fully charged, when the first current control component 104 and the second current control circuit 105 are unable to output the preset current, the energy storage component is in the discharge stage, and the remaining power stored in the energy storage component is used to power the light-emitting component 20.

[0075] Optionally, when the detection voltage is greater than or equal to the second set voltage, the first current control component 104 no longer outputs current, and outputs a third preset current through the second current control component 105 to perform constant current driving on each light-emitting module respectively. At this time, the second current control component 105 controls the charging of the energy storage component; specifically, when the detection voltage is greater than or equal to the second set voltage, the second current control component 105, the light-emitting module and the corresponding energy storage component form a current loop; exemplarily, Figure 2 For example, when the detection voltage is greater than the sum of the on-voltage of the light-emitting component 20 and the voltage of the energy storage component 2021, the branch between the light-emitting module 301 and the corresponding energy storage component 2021 is turned on, and the second current control component 105 outputs the first step current to the light-emitting module 301, so that the light-emitting module 201 can emit light; when the detection voltage is greater than the sum of the on-voltage of the light-emitting component 20 and the voltage of the energy storage component 2022, the branch between the light-emitting module 302 and the corresponding energy storage component 2022 is turned on, and the second current control component 105 outputs the second step current to the light-emitting module 302, so that the light-emitting module 302 can emit light; and so on; the second current control component 105 drives each light-emitting module with a constant current in turn according to the change in the detection voltage.

[0076] As the AC voltage decreases, the detection voltage is less than the starting voltage, the energy storage component is in the discharge stage, the energy storage component outputs a discharge current in the discharge stage, the light-emitting component 20, the first current control component 104 and the energy storage component form a discharge branch, and the light-emitting component 20 is connected to the discharge current to achieve light emission.

[0077] Please compare Figure 1 and Figure 2 , for example, in Figure 1 In the embodiment, since there is only one energy storage component 1021, the energy storage component 1021 is connected to the light-emitting module 201 accordingly. When the energy storage component 1021 is charged, the light-emitting module 201 and the light-emitting module 202 are connected in series, and the light-emitting module 201 and the light-emitting module 202 are both connected to the current; when the energy storage component 1021 is discharged, only the light-emitting module 201 is connected to the discharge current of the energy storage component 1021, and the light-emitting module 202 cannot be connected to the discharge current; therefore, in Figure 1In the embodiment, the light emitting component 20 is divided into two light emitting modules. With the charging and discharging process of the energy storage component 1021 , the currents connected to the light emitting module 201 and the light emitting module 202 are adjusted respectively to improve the power factor of the light emitting component 20 .

[0078] As an optional implementation, Figure 3 The circuit structure of the energy storage assembly provided in this embodiment is shown. Figure 3 The energy storage component includes: a first diode D1, a second diode D2 and a first capacitor C1.

[0079] The first end of the first capacitor C1 is connected to the rectifying component 101 and the first current control component 104, the anode of the first diode D1 and the cathode of the second diode D2 are connected to the second end of the first capacitor C1, the cathode of the first diode D1 is connected to the second current control component 105, and the anode of the second diode D2 is connected to the corresponding light-emitting component.

[0080] Among them Figure 3 In the circuit structure diagram of the energy storage component, the first capacitor C1 can store energy, and the second diode D2 can prevent the electric energy stored in the first capacitor C1 from flowing back to the corresponding light-emitting module.

[0081] As an optional implementation, Figure 4 The structure of the voltage dividing component 103 provided in this embodiment is shown in FIG. Figure 4 The voltage dividing component 103 includes: a first voltage dividing component 1031 and a second voltage dividing component 1032; wherein the first voltage dividing component 1031 is connected to the rectifying component 101 and the first current control component 104, and is used to divide the DC voltage to obtain the detection voltage.

[0082] The second voltage dividing component 1032 is connected to the rectifying component 101 and the second current control component 105 and is used for dividing the DC voltage to obtain a detection voltage.

[0083] The voltage dividing ratio of the first voltage dividing component 1031 is the same as that of the second voltage dividing component 1032. The first voltage dividing component 1031 and the second voltage dividing component 1032 are both connected to the detection voltage so that the change trend of the current connected to the light-emitting component 20 matches the change trend of the AC voltage, thereby improving the power factor of the light-emitting component 20.

[0084] As an optional implementation, Figure 5 FIG. 1 shows a schematic diagram of the circuit structure of the first voltage dividing component 1031 and the second voltage dividing component 1032 provided in this embodiment. Figure 5 The first voltage dividing component 1031 includes: a first resistor R1 and a second resistor R2.

[0085] The second voltage dividing component 1031 includes a third resistor R3 and a fourth resistor R4.

[0086] A first end of the first resistor R1 is connected to the rectifying component 101 , a second end of the first resistor R1 and a first end of the second resistor R2 are commonly connected to the first current control component 104 , and a second end of the second resistor R2 is used to access a reference voltage.

[0087] A first end of the third resistor R3 is connected to the rectifying component 101 , a second end of the third resistor R3 and a first end of the fourth resistor R4 are connected to the second current control component 105 , and a second end of the fourth resistor R4 is used to access a reference voltage.

[0088] Optionally, the reference voltage is a preset voltage reference value, for example, the second end of the second resistor R2 and the second end of the fourth resistor R4 are connected to the light-emitting module 20, and the first current control component 104 and the second current control component 105 can be connected to the detection voltage at the same time.

[0089] As an optional implementation, Figure 6 The circuit structure of the first current control component 104 provided in this embodiment is shown in FIG. Figure 6 , the first current control component 104 includes: a first constant current control chip U1 and a fifth resistor R5.

[0090] The voltage detection pin VT of the first constant current control chip U1 is connected to the first voltage dividing component 1031 , the power output pin REXT1 of the first constant current control chip U1 is connected to the first end of the fifth resistor R5 , and the second end of the fifth resistor R5 is connected to the light emitting component 20 .

[0091] The power control pin OUT1 of the first constant current control chip U1 is connected to the rectifier component 101 and each energy storage component.

[0092] As an optional implementation, Figure 7 The circuit structure of the second current control component 105 provided in this embodiment is shown in FIG. Figure 7 The second current control component 105 includes: a second constant current control chip U2 and a sixth resistor R6.

[0093] The voltage detection pin VT of the second constant current control chip U2 is connected to the second voltage dividing component 1032, the power output pin REXT of the second constant current control chip U2 is connected to the first end of the sixth resistor R6, and the second end of the sixth resistor R6 is connected to the light emitting component 20. The second constant current control chip U2 includes at least one power control pin ( Figure 6 OUT1 and OUT2 are used to represent this, wherein at least one power control pin is connected to at least one energy storage component in a one-to-one correspondence.

[0094] As an optional implementation, Figure 8 Another structural diagram of the light source driving circuit 10 provided in this embodiment is shown. Figure 2 The structure of the light source driving circuit 10 is shown in FIG. Figure 8 The light source driving circuit 10 further includes a flicker elimination component 106 , which is connected to the light emitting component 20 , the first current control component 104 and the second current control component 105 , and is used to eliminate the flicker of the light emitting component 20 .

[0095] When the first current control component 104 and the second current control component 105 respectively perform constant current control on the light emitting component 20 , the light emitting component 20 can be connected to the rated voltage through the flicker elimination component 106 .

[0096] As an optional implementation, Fig. 9 The circuit structure of the flicker elimination component 106 provided in this embodiment is shown in FIG. Fig. 9 The flicker elimination component 106 includes: a seventh resistor R7 and a second capacitor C2.

[0097] The first end of the seventh resistor R7 and the first end of the second capacitor C2 are connected to the first current control element 104 , the second current control element 105 and the first end of the light emitting element 20 . The second end of the seventh resistor R7 and the second end of the second capacitor C2 are connected to the second end of the light emitting element 20 .

[0098] In order to better illustrate the working principle of the light source driving circuit 10 in this embodiment, Figure 1 To Attachment Fig. 9 , through a specific application scenario to illustrate:

[0099] Phase 1: When the detection voltage is greater than or equal to the start voltage and less than the first set voltage, the energy storage component is in the stop phase, and the amount of electricity stored in the energy storage component is small. At this time, the first current control component 104 outputs the first preset current to the light emitting component 20; for example, please refer to Figure 6 , wherein the first preset current is as shown in formula (1):

[0100] I OUT1 =V REXT / R5 (1)

[0101] In the above formula (1), I OUT1 is the first preset current, V REXT is the voltage of the power output pin REXT1 of the first constant current control chip U1, and R5 is the resistance value of the fifth resistor R5.

[0102] The second stage: when the detection voltage is greater than or equal to the first set voltage and less than the second set voltage, the energy storage component is in the stop stage, and the power output pin REXT1 of the first constant current control chip U1 outputs the second preset current to each light-emitting module; please refer to Figure 6 , the second preset current is as shown in formula (2):

[0103] I OUT2 =V1 / R5 (2)

[0104] In the above formula (2), I OUT2 is the second preset current, V1 is the internal equivalent voltage of the first constant current control chip U1; and the change of V1 is negatively correlated with the change of the detection voltage.

[0105] The third stage: when the detection voltage is greater than or equal to the second set voltage, the energy storage component is connected to the DC voltage and charged; the first constant current control chip U1 is in a stopped state, and the second constant current control chip U2, the first capacitor C1, the first diode D1 and the corresponding light-emitting module form a working circuit; Figure 1 For example, when the voltage of the power output pin REXT of the second constant current control chip U2 is greater than the sum of the voltage of the light-emitting module 201 and the voltage of the corresponding first capacitor C1, the branch between the light-emitting module 201 and the corresponding first capacitor C1 is turned on, and the power output pin REXT of the second constant current control chip U2 outputs the third preset current to the light-emitting module 201; similarly, Figure 2 In the example, as the AC voltage changes, when the voltage of the power output pin REXT of the second constant current control chip U2 changes, Figure 2 Each light-emitting module in the system is sequentially connected to a step current through a power supply branch to achieve constant current driving of each light-emitting module.

[0106] The fourth stage: when the detection voltage is less than the starting voltage, since the energy storage component has passed the third stage and completed charging, the energy storage component enters the discharge stage, and the light-emitting module, the second diode D2, the first capacitor C1 and the first constant current control chip U1 form a working loop, and the discharge current of the first capacitor C1 can sustainably power the corresponding light-emitting module.

[0107] Fig.10 It shows that the embodiment provides the following conditions at various stages of the AC voltage: Figure 2 In the figure, the current connected to the light-emitting component 20 follows the change of the AC voltage. Therefore, the change trend of the current connected to the light-emitting component 20 in this embodiment follows the change trend of the AC voltage, thereby improving the power factor of the light-emitting component 20.

[0108] Fig.11 The structure of the lighting system 100 provided in this embodiment is shown in FIG. Fig.11 The lighting system 100 includes: the light source driving circuit 10 and the light emitting component 20 as described above, wherein the light emitting component 20 includes at least two light emitting modules cascaded in sequence, and each light emitting module is connected to the light source driving circuit 10.

[0109] Optionally, each light-emitting module includes at least one lamp bead, and the lamp bead is illustratively a red lamp bead, a blue lamp bead or a green lamp bead. In this embodiment, the light-emitting component 20 is divided into a plurality of light-emitting modules, so that the current connected to the light-emitting module during operation changes according to the AC voltage, thereby improving the power factor of the light-emitting component 20.

[0110] Fig.12 The implementation process of the light source driving method for improving the power factor provided by this embodiment is shown. Fig.12 The light source driving method is applied to a light emitting component, the light emitting module includes at least two light emitting modules cascaded in sequence, and the light source driving method includes the following steps:

[0111] S1101: Connect an AC voltage and rectify the AC voltage to obtain a DC voltage.

[0112] S1102: Divide the DC voltage to obtain a detection voltage.

[0113] S1103: When the detection voltage is greater than or equal to the start-up voltage and less than the first set voltage, the first preset voltage is output to each light-emitting module; when the detection voltage is greater than or equal to the first set voltage and less than the second set voltage, the second preset current is output to each light-emitting module.

[0114] S1104: When the detection voltage is greater than or equal to the second set voltage, control the branch between each light-emitting module and the corresponding energy storage component to be turned on in sequence, and output the third preset current to the corresponding light-emitting module.

[0115] Among them, one energy storage component is connected to one light-emitting module in a one-to-one correspondence, and the energy storage component has charging and discharging functions.

[0116] S1105: When the detection voltage is less than the start-up voltage and the energy storage component is in the discharge stage, the discharge current of the energy storage component is controlled to be output to each light-emitting module.

[0117] in Fig.12 Light source driving method and Figure 1 The light source driving circuit 10 corresponds to the Fig.12 The specific implementation of the light source driving method can be referred to Figures 1 to 10 The embodiments of the present invention will not be described in detail here.

[0118] Various embodiments are described herein for various devices, circuits, apparatuses, systems and / or methods. Many specific details are set forth to provide a thorough understanding of the overall structure, function, manufacture and use of the embodiments as described in the specification and shown in the drawings. However, those skilled in the art will appreciate that the embodiments may be implemented without such specific details. In other examples, well-known operations, parts and elements are described in detail so as not to make the embodiments in the specification difficult to understand. Those skilled in the art will appreciate that the embodiments herein and shown are non-limiting examples, and therefore it will be appreciated that the specific structural and functional details disclosed herein may be representative and do not necessarily limit the scope of the embodiments.

[0119] References to "various embodiments", "in an embodiment", "one embodiment", or "an embodiment" throughout the specification, etc., mean that a particular feature, structure, or characteristic described with respect to an embodiment is included in at least one embodiment. Therefore, the appearance of the phrases "in various embodiments", "in some embodiments", "in an embodiment", or "in an embodiment", etc., in appropriate places throughout the specification, do not necessarily refer to the same embodiment. In addition, particular features, structures, or characteristics may be combined in any appropriate manner in one or more embodiments. Therefore, a particular feature, structure, or characteristic shown or described with respect to one embodiment may be combined in whole or in part with features, structures, or characteristics of one or more other embodiments without assuming that such a combination is not an illogical or non-functional limitation. Any directional references (e.g., plus, minus, upper, lower, up, down, left, right, leftward, rightward, top, bottom, above, below, vertical, horizontal, clockwise, and counterclockwise) are used for identification purposes to help the reader understand the present disclosure, and do not create limitations, particularly with respect to the location, orientation, or use of the embodiments.

[0120] Although certain embodiments are described above with a certain degree of detail, those skilled in the art may make many changes to the disclosed embodiments without departing from the scope of the present disclosure. Connection references (e.g., attachment, coupling, connection, etc.) should be interpreted broadly and may include intermediate members between the connection of elements and relative motion between elements. Therefore, connection references do not necessarily imply that two elements are directly connected / coupled and are in a fixed relationship with each other. The use of "for example" throughout the specification should be interpreted broadly and used to provide non-limiting examples of embodiments of the present disclosure, and the present disclosure is not limited to such examples. It is intended that all matters included in the above description or shown in the accompanying drawings should be interpreted as merely illustrative rather than restrictive. Changes in details or structure may be made without departing from the present disclosure.

[0121] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A light source driving circuit for improving power factor, connected to a light emitting component, wherein the light emitting component comprises at least two light emitting modules cascaded in sequence, characterized in that: The light source driving circuit comprises: A rectifier component is connected to the mains, and the rectifier component includes a rectifier bridge, which is used to access the AC voltage output by the mains and rectify the AC voltage to obtain a DC voltage; At least one energy storage component is connected to the rectifying component, one energy storage component is connected to one light-emitting module correspondingly, and each energy storage component is used for charging or discharging; A voltage dividing component, connected to the rectifying component, for dividing the DC voltage to obtain a detection voltage; a first current control component connected to the rectifying component, the light-emitting component, the voltage dividing component and each of the energy storage components, and configured to output a first preset current to each of the light-emitting modules when the detection voltage is greater than or equal to the starting voltage and less than a first set voltage; and output a second preset current to each of the light-emitting modules when the detection voltage is greater than or equal to the first set voltage and less than a second set voltage; and a second current control component connected to the light-emitting component, the voltage-dividing component and at least one of the energy storage components, and configured to control the branch between each of the light-emitting modules and the corresponding energy storage component to be turned on in sequence when the detection voltage is greater than or equal to the second set voltage, and output a third preset current to the corresponding light-emitting module; The first current control component is also used to control the discharge current of the energy storage component to be output to each of the light-emitting modules when the detection voltage is less than the start-up voltage and the energy storage component is in the discharge stage; Among them, the first preset current is a fixed value, and the second preset current is negatively correlated with the change in the detection voltage. When the detection voltage is greater than or equal to the second set voltage, the first current control component no longer outputs current, and the third preset current is output through the second current control component to perform constant current drive on each light-emitting module respectively. At this time, the second current control component controls the charging of the energy storage component; specifically, when the detection voltage is greater than or equal to the second set voltage, the second current control component, the light-emitting module and the corresponding energy storage component form a current loop, and the second current control component performs constant current drive on each light-emitting module in turn according to the change in the detection voltage.

2. The light source driving circuit according to claim 1, characterized in that: Each of the energy storage components comprises: A first diode, a second diode and a first capacitor; The first end of the first capacitor is connected to the rectifier component and the first current control component, the anode of the first diode and the cathode of the second diode are connected to the second end of the first capacitor, the cathode of the first diode is connected to the second current control component, and the anode of the second diode is connected to the corresponding light-emitting component.

3. The light source driving circuit according to claim 1, characterized in that: The voltage dividing component comprises: A first voltage dividing component, connected to the rectifying component and the first current control component, and configured to divide the DC voltage to obtain the detection voltage; and The second voltage dividing component is connected to the rectifying component and the second current control component, and is used for dividing the DC voltage to obtain the detection voltage.

4. The light source driving circuit according to claim 3, characterized in that: The first voltage dividing component includes: a first resistor and a second resistor; The second voltage dividing component includes: a third resistor and a fourth resistor; The first end of the first resistor is connected to the rectifying component, the second end of the first resistor and the first end of the second resistor are commonly connected to the first current control component, and the second end of the second resistor is used to access the reference voltage; The first end of the third resistor is connected to the rectifier component, the second end of the third resistor and the first end of the fourth resistor are commonly connected to the second current control component, and the second end of the fourth resistor is used to access the reference voltage.

5. The light source driving circuit according to claim 3, characterized in that: The first current control component comprises: A first constant current control chip and a fifth resistor; The voltage detection pin of the first constant current control chip is connected to the first voltage dividing component, the power output pin of the first constant current control chip is connected to the first end of the fifth resistor, and the second end of the fifth resistor is connected to the light emitting component; The power control pin of the first constant current control chip is connected to the rectifier component and each of the energy storage components.

6. The light source driving circuit according to claim 3, characterized in that: The second current control component comprises: A second constant current control chip and a sixth resistor; The voltage detection pin of the second constant current control chip is connected to the second voltage dividing component, the power output pin of the second constant current control chip is connected to the first end of the sixth resistor, the second end of the sixth resistor is connected to the light-emitting component, and the second constant current control chip includes at least one power control pin, wherein at least one of the power control pins is connected one-to-one with at least one of the energy storage components.

7. The light source driving circuit according to claim 1, characterized in that: The light source driving circuit further includes: A flicker elimination component is connected to the light-emitting component, the first current control component and the second current control component, and is used to eliminate the flicker of the light-emitting component.

8. The light source driving circuit according to claim 7, characterized in that: The flicker elimination component comprises: a seventh resistor and a second capacitor; The first end of the seventh resistor and the first end of the second capacitor are connected to the first current control component, the second current control component and the first end of the light-emitting component, and the second end of the seventh resistor and the second end of the second capacitor are connected to the second end of the light-emitting component.

9. A lighting system, characterized in that: include: The light source driving circuit according to any one of claims 1 to 8; and A light-emitting component, wherein the light-emitting component comprises at least two light-emitting modules cascaded in sequence, and each of the light-emitting modules is connected to the light source driving circuit.

10. A method for driving a light source to improve power factor, applied to a light emitting assembly, wherein the light emitting assembly comprises at least two light emitting modules cascaded in sequence, characterized in that: The light source driving method comprises: Connecting an AC voltage and rectifying the AC voltage through a rectifier bridge to obtain a DC voltage; Dividing the DC voltage to obtain a detection voltage; When the detection voltage is greater than or equal to the start-up voltage and less than the first set voltage, a first preset current is output to each of the light-emitting modules; when the detection voltage is greater than or equal to the first set voltage and less than the second set voltage, a second preset current is output to each of the light-emitting modules; When the detection voltage is greater than or equal to the second set voltage, the branch between each of the light-emitting modules and the corresponding energy storage component is controlled to be turned on in sequence, and the third preset current is output to the corresponding light-emitting module; When the detection voltage is less than the start-up voltage and the energy storage component is in a discharge stage, controlling the discharge current of the energy storage component to be output to each of the light-emitting modules; Among them, the first preset current is a fixed value, and the second preset current is negatively correlated with the change in the detection voltage. When the detection voltage is greater than or equal to the second set voltage, the first current control component no longer outputs current, and the third preset current is output through the second current control component to perform constant current drive on each light-emitting module respectively. At this time, the second current control component controls the charging of the energy storage component; specifically, when the detection voltage is greater than or equal to the second set voltage, the second current control component, the light-emitting module and the corresponding energy storage component form a current loop, and the second current control component performs constant current drive on each light-emitting module in turn according to the change in the detection voltage.

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