Power factor correction circuit for multi-street lamp and multi-street lamp comprising same

Abstract

The utility model relates to a power factor correction circuit for a plurality of street lamps and a plurality of street lamps comprising the same, the plurality of street lamps comprise a plurality of branches, each branch comprises a capacitor element, a constant current driving chip and at least one lamp load, the anode of the at least one lamp load is connected to a power supply input end, the first end of the capacitor element is connected to the power supply input end, and the second end of the capacitor element is connected to the constant current driving chip. The first end of the capacitor element is grounded, the second end of the capacitor element is grounded, the constant-current driving chip is connected in series between the ground and the negative electrode of the at least one lamp load or between the power input end and the positive electrode of the at least one lamp load, and the power factor correction circuit is located in at least one branch of the multiple branches and comprises at least one resistor element. Each resistor element is located in the corresponding branch in the at least one branch, and the resistor elements are arranged between the power input end and the first end of the capacitor element or between the second end of the capacitor element and the ground, so that the technical effects of the multi-street lamp with high power factor, low cost and simple structure are achieved.

Description

Technical Field

[0001] This application relates to multi-way lights, and more particularly, to a power factor correction circuit for multi-way lights and a multi-way light including the same. Background Technology

[0002] Multi-channel lights are an indispensable component of modern lighting systems, especially suitable for scenarios requiring diverse lighting effects and flexibility, such as commercial spaces, residential areas, public places, and outdoor lighting. Through multiple independent channels, multi-channel lights can provide light of varying brightness, meeting a wide range of lighting needs from low to high illuminance.

[0003] Power factor is a crucial indicator of the energy efficiency of lighting equipment. With increasing global emphasis on energy conservation and environmental protection, lighting equipment is expected to have a high power factor, such as 0.7 or higher. A high power factor signifies efficient electricity utilization, reducing reactive power demand on the power grid, thereby lowering overall energy consumption and environmental pollution.

[0004] To meet this high standard, current multi-way lighting designs often employ complex active power factor correction (APFC) circuits. APC circuits typically include components such as control chips and power switches. While these can improve the power factor of the multi-way lighting, they significantly increase the manufacturing cost of the fixtures. Furthermore, the complexity of APC circuits can introduce additional maintenance and failure risks, further limiting the large-scale deployment and application of multi-way lighting.

[0005] Therefore, a new circuit design is desired to improve the overall power factor of multi-lamp circuits (especially when multiple branches are simultaneously active) in a cost-effective manner. Utility Model Content

[0006] This application is made in view of the above-mentioned problems. The main purpose of this application is to provide a solution for the power factor of multi-way lights, which can not only meet or exceed the power factor requirements of industry standards, but also keep the cost of multi-way lights low and the structure simple, so as to promote their application in a wider range of scenarios, so as to solve the technical problem that multi-way lights in the prior art cannot simultaneously meet the requirements of high power factor, low cost and simple structure.

[0007] To achieve the above objectives, according to one aspect of this application, a power factor correction circuit for a multi-channel lamp is provided. The multi-channel lamp includes multiple branches, each branch including a capacitor element, a constant current drive chip, and at least one lamp load. The at least one lamp load has a positive terminal and a negative terminal. The positive terminal of the at least one lamp load is directly or indirectly connected to a power input terminal. The capacitor element includes a first terminal and a second terminal. The first terminal of the capacitor element is connected to the power input terminal, and the second terminal of the capacitor element is grounded. The constant current drive chip is connected in series between ground and the negative terminal of the at least one lamp load or between the power input terminal and the positive terminal of the at least one lamp load. The power factor correction circuit is located in at least one of the multiple branches. The power factor correction circuit includes at least one resistor element, each resistor element located in a corresponding branch of the at least one branch, and the resistor element is arranged between the power input terminal and the first terminal of the capacitor element or between the second terminal of the capacitor element and ground.

[0008] In this manner, a power factor correction circuit for multi-way lights is provided. By connecting a resistor in series with either side of the capacitor element in at least one branch, the duration of the charging current during the charging of the capacitor element in that at least one branch is extended, thereby improving the overall power factor of the multi-way lights, particularly the power factor of the multi-way lights when the at least one branch is conducting. This improves the circuit's energy efficiency without increasing additional costs. Furthermore, the power factor correction circuit including the at least one resistor element is low in cost and simple in structure.

[0009] Furthermore, according to one embodiment of this application, the number of lamp loads in the multiple branches is different from each other.

[0010] In this way, because the number of lamps in each branch is different, different brightness levels can be achieved when different branches are turned on, thus enabling multi-light systems with multiple brightness levels. Combined with a power factor correction circuit, the power factor of the multi-light system can be improved at some or even all brightness levels.

[0011] Furthermore, according to one embodiment of this application, the power factor correction circuit further includes: at least one diode, each diode being located in a corresponding branch of at least one branch and connected in parallel with a resistive element in the branch, and the anode of the diode being located upstream of the discharge path of the capacitor element relative to the cathode of the diode.

[0012] In this way, by using a diode connected in parallel with the resistor and taking advantage of the diode's forward conduction characteristic, the capacitor can discharge through the diode instead of the resistor. This reduces the power loss caused by the capacitor discharging through the resistor, improves the circuit's energy efficiency, and maintains the circuit's simplicity and low cost.

[0013] Furthermore, according to one embodiment of this application, for any of the at least one resistive element, when the resistive element is arranged between the power input terminal and the first terminal of the capacitor element, the anode of the diode connected in parallel with the resistive element is connected to the first terminal of the capacitor element, and the cathode of the diode is connected to the power input terminal.

[0014] In this way, when the resistor is positioned between the power input terminal and the first terminal of the capacitor, the anode of the diode is connected to the first terminal of the capacitor, so that the anode of the diode is positioned upstream of the discharge path of the capacitor relative to the cathode.

[0015] Furthermore, according to one embodiment of this application, for any of the at least one resistive element, when the resistive element is arranged between the second end of the capacitor element and the ground, the anode of the diode connected in parallel with the resistive element is connected to the ground, and the cathode of the diode is connected to the second end of the capacitor element.

[0016] In this way, when the resistive element is arranged between the second end of the capacitor element and ground, the anode of the diode is connected to ground, so that the anode of the diode is located upstream of the discharge path of the capacitor element relative to the cathode.

[0017] Furthermore, according to one embodiment of this application, at least one resistive element comprises only one resistive element located in the branch with the largest number of lamp loads among multiple branches.

[0018] In multi-light circuits, high-load branches have a greater impact on the power factor than low-load branches. Therefore, by applying power factor correction circuitry only in high-load branches, a significant power factor improvement can be achieved at a lower cost.

[0019] Furthermore, according to one embodiment of this application, each of the at least one resistive element includes a plurality of resistors connected in parallel or in series.

[0020] This approach expands the flexibility of the power factor correction circuit, allowing it to adjust under different conditions to achieve optimal power factor performance. This design flexibility also facilitates cost control and performance optimization in the manufacturing of multi-way lights.

[0021] According to another aspect of this application, a multi-way lamp is provided, comprising: the power factor correction circuit for the multi-way lamp described above; and multiple branches, each branch including a capacitor element, a constant current drive chip, and at least one lamp load, the at least one lamp load having a positive terminal and a negative terminal, the positive terminal of the at least one lamp load being directly or indirectly connected to a power input terminal, the capacitor element including a first terminal and a second terminal, the first terminal of the capacitor element being connected to the power input terminal, the second terminal of the capacitor element being grounded, the constant current drive chip being connected in series between the ground and the negative terminal of the at least one lamp load or between the power input terminal and the positive terminal of the at least one lamp load, wherein at least one resistor element of the power factor correction circuit is located in at least one of the multiple branches.

[0022] In this way, a multi-channel light is provided. Compared with the existing technology, this multi-channel light can maintain a high power factor and reduce power consumption when multiple branches are simultaneously conducting. At the same time, it is inexpensive, simple in structure, and easy to apply on a large scale.

[0023] Furthermore, according to one embodiment of this application, for any one of the multiple branches, the negative terminal of the at least one lamp load is connected to the output terminal of the constant current drive chip, and the ground terminal of the constant current drive chip is connected to ground.

[0024] In this way, the constant current drive chip can be connected in series between ground and the negative terminal of the at least one lamp load.

[0025] Furthermore, according to one embodiment of this application, for any one of the plurality of branches, the power input terminal of the constant current drive chip is connected to the power input terminal, and the output terminal of the constant current drive chip is connected to the positive terminal of the at least one lamp load.

[0026] In this way, the constant current drive chip can be connected in series between the power input terminal and the positive terminal of the at least one lamp load.

[0027] In this application embodiment, a power factor correction circuit for a multi-channel lamp is provided. The multi-channel lamp includes multiple branches, each branch including a capacitor element, a constant current driver chip, and at least one lamp load. The at least one lamp load has a positive terminal and a negative terminal. The positive terminal of the at least one lamp load is directly or indirectly connected to a power input terminal. The capacitor element includes a first terminal and a second terminal. The first terminal of the capacitor element is connected to the power input terminal, and the second terminal of the capacitor element is grounded. The constant current driver chip is located between ground and the negative terminal of the at least one lamp load, or between the power input terminal and the positive terminal of the at least one lamp load. The power factor correction circuit is connected in series and located in at least one of the multiple branches. The power factor correction circuit includes at least one resistive element, each resistive element located in a corresponding branch of the at least one branch, and the resistive element is arranged between the power input terminal and the first terminal of the capacitor element or between the second terminal of the capacitor element and ground. This is to at least solve the technical problem in the prior art that multi-way lights cannot simultaneously meet the requirements of high power factor, low cost and simple structure, thereby achieving the technical effect of providing multi-way lights with high power factor while maintaining simple structure and low cost. Attached Figure Description

[0028] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0029] Figure 1 This is a schematic circuit diagram of a power factor correction circuit for a multi-way lamp according to the first embodiment of this application, and a multi-way lamp including the power factor correction circuit.

[0030] Figure 2 This is a schematic circuit diagram of a power factor correction circuit for a multi-way lamp according to the first embodiment of this application, and another schematic circuit diagram of a multi-way lamp including the power factor correction circuit;

[0031] Figure 3 This is a schematic circuit diagram of a power factor correction circuit for a multi-way lamp according to the second embodiment of this application, and a multi-way lamp including the power factor correction circuit.

[0032] Figure 4 This is a schematic circuit diagram of a multi-way lamp according to a third embodiment of this application; and

[0033] Figure 5 This is a schematic circuit diagram of a power factor correction circuit for a multi-way lamp according to the fourth embodiment of this application, and a multi-way lamp including the power factor correction circuit.

[0034] The above figures include the following reference numerals:

[0035] 100 Power Factor Correction Circuit

[0036] 110(1101, 1102): Resistive element

[0037] 120: Diode

[0038] 200: Multi-channel lights

[0039] 2001: First Branch Road

[0040] 2002: Second Branch Road

[0041] 2003: Third Branch Road

[0042] 210(2101, 2102, 2103): Capacitor element

[0043] 220 (2201, 2202, 2203): Constant current driver chip

[0044] 230(2301, 2302, 2303): At least one lamp load Detailed Implementation

[0045] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0046] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0047] In this application, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this application.

[0048] The purpose of this application is to provide a power factor correction circuit for a multi-way lamp and a multi-way lamp including the power factor correction circuit, which can improve the total power factor of the multi-way lamp while keeping the multi-way lamp simple in structure and low in cost.

[0049] Therefore, this application provides a power factor correction circuit for a multi-channel lamp, the multi-channel lamp including multiple branches, each branch including a capacitor element, a constant current drive chip and at least one lamp load, the at least one lamp load having a positive terminal and a negative terminal, the positive terminal of the at least one lamp load being directly or indirectly connected to a power input terminal, the capacitor element including a first terminal and a second terminal, the first terminal of the capacitor element being connected to the power input terminal and the second terminal of the capacitor element being grounded, the constant current drive chip being connected in series between ground and the negative terminal of the at least one lamp load or between the power input terminal and the positive terminal of the at least one lamp load, the power factor correction circuit being located in at least one of the multiple branches, the power factor correction circuit including at least one resistor element, each resistor element being located in a corresponding branch of the at least one branch, and the resistor element being arranged between the power input terminal and the first terminal of the capacitor element or between the second terminal of the capacitor element and ground.

[0050] In this application, by providing the aforementioned resistive element in each of at least one branch, the duration of the charging current of the capacitor element can be extended, thereby improving the power factor (PF) of the circuit. The principle of improving the power factor is explained below:

[0051] In each branch of a multi-channel light, the capacitor is charged during the positive half-cycle of each power supply voltage. Under normal conditions without resistors, the charging current of the capacitor will rise rapidly and reach its maximum value near the voltage peak, then drop rapidly as the voltage decreases. At this time, the charging time is short and the rise and fall of the current waveform are very steep.

[0052] When a resistor is introduced in series with the capacitor, the resistor increases the circuit impedance as the current rises, slowing down the rate of current increase and thus prolonging the time it takes for the current to reach its peak value. Similarly, when the voltage drops, the resistor slows down the rate of current decrease, prolonging the time it takes for the current to drop from its peak value to zero, thereby delaying the duration of the charging current of the capacitor.

[0053] An improvement in the power factor is closely related to the fit between the current and voltage waveforms. When the charging current of a capacitor element lasts longer and its waveform is smoother, the phase difference between the charging current and voltage waveforms decreases. This decrease in phase difference means that the ratio of active power (actual power consumed) to apparent power (the absolute value of the product of voltage and current) in the circuit increases. Since the power factor is defined as the ratio of active power to apparent power in a circuit, an improvement in the circuit's power factor is achieved.

[0054] Therefore, this application can improve the total power factor of a multi-way lamp by using a power factor correction circuit that is simple in structure and low in cost, especially the total power factor when all branches of the multi-way lamp are turned on.

[0055] In this application, a multi-way light may include two or more branches. In an exemplary embodiment, the number of resistive elements in the at least one resistive element may be one, and further, this single resistive element may be located in the branch with the largest number of lamp loads among the multiple branches of the multi-way light. This is because, among the multiple branches of a multi-way light, high-load branches have a greater impact on the power factor than low-load branches. Therefore, by applying power factor correction circuitry only in high-load branches, without having to apply power factor correction circuitry in low-load branches, a greater power factor improvement can be achieved at a lower cost.

[0056] Alternatively, the number of the at least one resistive element can be equal to the number of branches in the multi-way lamp, and each resistive element can be located in a corresponding branch. Alternatively, the number of the at least one resistive element can be greater than and less than the number of branches, and the at least one resistive element can be located in any at least one of the multiple branches. Preferably, the at least one resistive element can be located in at least one of the multiple branches with a larger number of lamp loads (e.g., the first at least one of the multiple branches arranged in descending order of lamp load).

[0057] Furthermore, in this application, each resistive element may include multiple resistors connected in parallel or series. This increases the flexibility of the resistive element composition and facilitates cost control and performance optimization in the manufacturing of multi-way lights. For example, each resistive element may include multiple resistors with the same resistance value connected in parallel or series; the resistance value of the resistive element can be changed simply by altering the number of resistors to meet circuit requirements. Alternatively, the resistance values ​​of the multiple resistors connected in parallel or series within a single resistive element may be different from each other, or partially the same and partially different.

[0058] Furthermore, in this application, the power factor correction circuit may also include a diode connected in parallel with each resistive element.

[0059] The diodes in this application may include at least one of Schottky diodes, fast recovery diodes, Zener diodes, and standard rectifier diodes. The capacitors in this application may include at least one of electrolytic capacitors, ceramic capacitors, and film capacitors. The lamp loads in this application may include light-emitting diodes (LEDs).

[0060] The power supply used in this application is an AC power supply, such as an AC power supply with a rated voltage of 120V and a rated frequency of 60Hz. In this application, the positive terminal of at least one lamp load in each branch can be directly or indirectly (e.g., via a rectifier circuit such as a rectifier bridge and / or via a constant current drive chip) connected to the power input terminal of the multi-way lamp, and the first terminal of the capacitor element in each branch can be directly or indirectly (e.g., via a rectifier circuit such as a rectifier bridge and / or via a resistor element) connected to the power input terminal of the multi-way lamp.

[0061] In this application, each capacitor element may also be connected in parallel with an additional resistor element to further control the charging and discharging process of the capacitor and improve the circuit response.

[0062] Figure 1 This is a schematic circuit diagram of a power factor correction circuit for a multi-way lamp according to a first embodiment of this application, and a multi-way lamp including the power factor correction circuit. The first embodiment shows a case where the resistive element of the power factor correction circuit is connected in series with the power supply side of the capacitor element. It should be noted that, for the sake of simplicity, the diagram is provided as an example. Figure 1 The illustration shows a multi-way light 200 comprising only two branches: a first branch 2001 and a second branch 2002, and a power factor correction circuit 100 comprising only one resistive element 110 located in the second branch 2002. However, those skilled in the art will understand that in the case of two branches, the resistive element 110 of the power factor correction circuit 100 may also be located in the first branch 2001 instead of the second branch 2002. Alternatively, the power factor correction circuit 100 may include two resistive elements, located in the first branch 2001 and the second branch 2002, respectively. Furthermore, the multi-way light 200 may also include more branches, and the power factor correction circuit 100 may include resistive elements in at least one of the multiple branches. Figure 1 The multi-channel light shown can also be called a "three-channel light" because it has three brightness levels, corresponding to: only the first branch 2001 is conducting, only the second branch 2002 is conducting, and both the first branch 2001 and the second branch 2002 are conducting.

[0063] like Figure 1As shown, the first branch 2001 of the multi-channel lamp 200 includes a capacitor element 2101, a constant current drive chip 2201, and at least one lamp load 2301. The at least one lamp load 2301 has a positive terminal and a negative terminal. The positive terminal of the at least one lamp load 2301 is connected to the power input terminal. The capacitor element 2101 includes a first end and a second end. The first end of the capacitor element 2101 is connected to the positive terminal of the at least one lamp load 2301, thus connecting to the power input terminal. The second end of the capacitor element 2101 is grounded. The constant current drive chip 2201 is connected in series between ground and the negative terminal of the at least one lamp load 2301. The second branch 2002 of the multi-channel lamp 200 includes a capacitor element 2102, a constant current drive chip 2202, and at least one lamp load 2302. The connection method of these components is the same as that in the first branch 2001. Without needing to distinguish between them, capacitor elements 2101 and 2102 can be collectively referred to as capacitor element 210, constant current drive chip 2201 and constant current drive chip 2202 can be collectively referred to as constant current drive chip 220, and at least one lamp load 2301 and at least one lamp load 2302 can be collectively referred to as at least one lamp load 230. The power factor correction circuit 100 includes a resistor element 110 located in the second branch 2002 and arranged between the positive terminal of at least one lamp load 2302 and the first terminal of capacitor element 2102.

[0064] Because a resistor 110 is connected in series with the power supply side of the capacitor 2102 in the second branch 2002, the resistor 110 can slow down the rise and fall rates of the charging current of the capacitor 2102, prolong the charging current time, smooth the waveform of the charging current, and reduce the phase difference between the charging current waveform and the voltage waveform, thereby improving the power factor of the circuit when the second branch is conducting. Therefore, the overall power factor of the multi-way light 200 can be improved in both positions (when only the second branch is conducting and when both the first and second branches are conducting). In particular, when both the first and second branches of the multi-way light 200 are conducting, the overall power factor of the multi-way light can be improved to over 0.7.

[0065] The number of lamp loads in the first branch 2001 and the second branch 2002 can be the same or different. In an exemplary embodiment, the number of at least one lamp load 2301 in the first branch 2001 can be less than the number of at least one lamp load 2302 in the second branch 2002, such that the second branch 2002 has a higher load compared to the first branch 2001. By applying a power factor correction circuit in the second branch with a higher load, a greater power factor improvement can be achieved at a lower cost compared to applying a power factor correction circuit in the first branch with a lower load.

[0066] Furthermore, the resistive element 110 may include multiple resistors connected in parallel or series. The resistance values ​​of these multiple resistors may be the same or different.

[0067] Furthermore, the power factor correction circuit 100 may also include another resistive element, which may be located in the first branch 2001 and arranged between the power input terminal and the first terminal of the capacitor element 2101 or between the second terminal of the capacitor element 2101 and ground.

[0068] In this application, each constant current driver chip 210 may further include an external resistor connection terminal (shown as REXT in the figure), which is used to connect to an external resistor whose resistance value can be used to determine the drive current of the lamp load. Each constant current driver chip 210 may further include a power input terminal, which is used to connect to the positive input terminal of a power supply.

[0069] It should be noted that, Figure 1 In each branch, the negative terminal of at least one lamp load 230 is connected to the output terminal OUT of the corresponding constant current driver chip 220, and the ground terminal GND of the constant current driver chip 220 is connected to ground, such that the constant current driver chip 220 is connected in series between the negative terminal of at least one lamp load 230 and ground. However, for any one or more branches, the constant current driver chip 220 can also be connected in series between the power input terminal and the positive terminal of at least one lamp load 230. Figure 4 This situation has been shown and will be described later.

[0070] Figure 2 This is a schematic circuit diagram of a power factor correction circuit for a multi-way lamp according to the first embodiment of this application, and another schematic circuit diagram of a multi-way lamp including the power factor correction circuit. Figure 2 The power factor correction circuit according to the first embodiment is shown to include a diode connected in parallel with a resistive element. Figure 2 The power factor correction circuit 100 and Figure 1 Compared to the first branch, it also includes a diode 120 connected in parallel with the resistor element 110 in the second branch 2002. For example... Figure 2 As shown, the anode of diode 120 is connected to the first terminal of capacitor element 2102, and the cathode of diode 120 is connected to the power input terminal (in... Figure 2 It is also connected to the positive terminal of at least one lamp load 2302. Thus, the anode of the diode 120, which is connected in parallel with the resistor element 110, is located upstream of the discharge path of the capacitor element 2102 relative to the cathode.

[0071] By positioning the anode of diode 120 upstream of the cathode in the discharge path of capacitor 2102, the forward conduction characteristic of diode 120 can be utilized. When capacitor 2102 is charging via resistor 110, diode 120 is not conducting and has no effect on the charging of capacitor 2102. However, when capacitor 2102 is discharging, diode 120 conducts due to forward bias, so the discharge current of capacitor 2102 flows through diode 120 instead of resistor 110. This reduces power loss caused by capacitor discharging via resistor 110, improving the energy efficiency of the circuit.

[0072] Figure 3 This is a schematic circuit diagram of a power factor correction circuit for a multi-way lamp according to a second embodiment of this application, and a multi-way lamp including the power factor correction circuit. The second embodiment shows a case where the resistive element of the power factor correction circuit is connected in series with the ground side of the capacitor element, rather than the power supply side. For ease of comparison, except for the arrangement of the resistive element 110, Figure 3 The number of components and connection method of the multi-way light shown are the same as those of the other components. Figure 1 The same applies to both. Figure 3 The power factor correction circuit 100 shown is... Figure 1 The only difference is: Figure 3 The resistor element 110 in the second branch 2002 is arranged between the second terminal of the capacitor element 2102 and ground.

[0073] By connecting the resistor 110 in series between the ground side of the capacitor and ground, rather than between the power supply side of the capacitor and the power input terminal, the resistor 110 can also slow down the rise and fall rate of the charging current when the capacitor 2102 is charging, prolong the charging current time, smooth the waveform of the charging current, reduce the phase difference between the charging current waveform and the voltage waveform, thereby improving the power factor of the circuit when the second branch is conducting.

[0074] Figures 1 to 3 The diagram illustrates the case where the power factor correction circuit 100 includes only one resistor element 110. When the power factor correction circuit 100 includes multiple resistor elements 110 instead of a single resistor element 110, these multiple resistor elements 110 can all be connected in series on the same side (power supply side or ground side) of the capacitor element, or some resistor elements 110 can be connected in series on the power supply side of the capacitor element while other resistor elements 110 are connected in series on the ground side of the capacitor element. Figure 5 This is a schematic circuit diagram of a power factor correction circuit for a multi-way lamp according to the fourth embodiment of this application, and a multi-way lamp including the power factor correction circuit. Figure 5 The multi-way lights shown Figure 1 Compared to the multi-way lights shown, the only difference is: Figure 5 The multi-channel lamp 200 also includes a third branch 2003, and a power factor correction circuit 100 is applied in two of the three branches (i.e., the second branch 2002 and the third branch 2003). The number of lamp loads in the three branches are different from each other.

[0075] like Figure 5 As shown, the third branch 2003 includes a capacitor element 2103, a constant current drive chip 2203, and at least one lamp load 2303. The connection method of these components is similar to... Figure 1 The first branch 2001 and the second branch 2002 shown are the same and will not be described again here. The power factor correction circuit 100 includes a first resistive element 1101 and a second resistive element 1102. The first resistive element 1101 is located in the second branch 2002 and is arranged between the power input terminal (i.e., the positive terminal of at least one lamp load 2302) and the first terminal of the capacitor element 2102. The second resistive element 1102 is located in the third branch 2003 and is arranged between the power input terminal (i.e., the positive terminal of at least one lamp load 2303) and the first terminal of the capacitor element 2103. Unless otherwise specified, the first resistive element 1101 and the second resistive element 1102 can be collectively referred to as resistive element 110.

[0076] use Figure 5 The arrangement of the power factor correction circuit 100 and the multi-way lamp 200 shown can also improve the overall power factor of the multi-way lamp, especially the overall power factor of the circuit when at least one of the second branch 2002 and the third branch 2003 is turned on.

[0077] In an exemplary embodiment, the number of lamp loads in the second branch 2002 and the third branch 2003 can be greater than the number of lamp loads in the first branch 2001. This allows for a greater power factor improvement at a lower cost.

[0078] Alternatively, the first resistor element 1101 in the second branch 2002 and / or the second resistor element 1102 in the third branch 2003 may also be arranged between the second terminal of the capacitor element 2103 and ground.

[0079] Furthermore, a resistor element can be provided in the first branch 200, which can be arranged between the second end of the capacitor element and ground or between the power input terminal and the first end of the capacitor element.

[0080] Alternatively, in any one or more of the first to third branches, the constant current drive chip can be connected in series between the power input terminal and the positive terminal of at least one lamp load.

[0081] Furthermore, the power factor correction circuit 100 may also include two diodes (not shown in the figure), which are connected in parallel with the first resistor element 1101 and the second resistor element 1102, respectively, and the anode of the diode is connected to the first terminal of the corresponding capacitor element, while the cathode of the diode 120 is connected to the positive terminal of the corresponding at least one lamp load.

[0082] The above is for reference only. Figures 1 to 5 Exemplary cases of multi-way lights with two or three branches are described. Those skilled in the art will recognize that a power factor correction circuit comprising at least one resistive element (or additional diodes) can also be applied in at least one branch of a multi-way light with more branches.

[0083] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0084] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0085] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A power factor correction circuit for a multi-lamp lighting system, characterized by, The multi-channel lamp (200) comprises a plurality of branches, each of the branches comprising a capacitor element, a constant current driving chip, and at least one lamp load having a positive electrode and a negative electrode, the positive electrode of the at least one lamp load being directly or indirectly connected to a power input, the capacitor element comprising a first end and a second end, the first end of the capacitor element being connected to the power input, the second end of the capacitor element being grounded, the constant current driving chip being connected in series between the ground and the negative electrode of the at least one lamp load or between the power input and the positive electrode of the at least one lamp load, the power factor correction circuit being located in at least one of the plurality of branches, the power factor correction circuit (100) comprising: at least one resistance element (110), each of the resistance elements being located in a corresponding one of the at least one branch, and the resistance element being arranged between the power input and the first end of the capacitor element or between the second end of the capacitor element and the ground.

2. The power factor correction circuit for a multi-lamp lighting system of claim 1, wherein, The number of lamp loads in the plurality of branches is different from each other.

3. The power factor correction circuit for a multi-lamp arrangement according to claim 1 or 2, characterized in that, The power factor correction circuit further comprises: at least one diode (120), each of the diodes being located in a corresponding one of the at least one branch and being connected in parallel with the resistance element in the branch, and the anode of the diode being located at an upstream position of a discharge path of the capacitor element relative to the cathode of the diode.

4. The power factor correction circuit for multi-channel lamp according to claim 3, wherein for any one of the at least one resistance element, when the resistance element is arranged between the power input and the first end of the capacitor element, the anode of the diode connected in parallel with the resistance element is connected to the first end of the capacitor element, and the cathode of the diode is connected to the power input.

5. The power factor correction circuit for multi-channel lamp according to claim 3, wherein for any one of the at least one resistance element, when the resistance element is arranged between the second end of the capacitor element and the ground, the anode of the diode connected in parallel with the resistance element is connected to the ground, and the cathode of the diode is connected to the second end of the capacitor element.

6. The power factor correction circuit for a multi-lamp ballast as defined in Claim 1 or 2, wherein, The at least one resistance element comprises only one resistance element, and the one resistance element is located in the branch having the largest number of lamp loads among the plurality of branches.

7. The power factor correction circuit for a multi-lamp ballast as defined in Claim 1 or 2, wherein Each of the at least one resistance element comprises a plurality of resistors connected in parallel or in series.

8. A multiple way light characterized by, comprises: the power factor correction circuit (100) for multi-channel lamp according to any one of claims 1 to 7; and and a plurality of branches, each of the branches comprising a capacitive element, a constant current driving chip and at least one lamp load, the at least one lamp load having a positive pole and a negative pole, the positive pole of the at least one lamp load being directly or indirectly connected to a power input, the capacitive element comprising a first end and a second end, the first end of the capacitive element being connected to the power input, the second end of the capacitive element being grounded, the constant current driving chip being connected in series between the ground and the negative pole of the at least one lamp load or between the power input and the positive pole of the at least one lamp load, wherein at least one resistive element of the power factor correction circuit is located in at least one of the plurality of branches, respectively.

9. The multiple way light of claim 8 wherein, For any of the plurality of branches, the negative pole of the at least one lamp load is connected to an output terminal of the constant current driving chip, and a ground terminal of the constant current driving chip is connected to the ground.

10. The multi-way light of claim 8, wherein, For any of the plurality of branches, a power input terminal of the constant current driving chip is connected to the power input, and an output terminal of the constant current driving chip is connected to the positive pole of the at least one lamp load.

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