External power factor compensation device for low-power-factor lighting equipment and lighting equipment

Abstract

The invention provides an external power factor compensation device for low-power-factor lighting equipment and the lighting equipment. The device comprises an external power factor compensation shell and an external power factor compensation module, the external power factor compensation module is arranged in the external power factor compensation shell, the external power factor compensation module comprises an input protection circuit, an input EMC circuit, a rectification filter circuit, a power output circuit and a control circuit, and the output end of the power output circuit is connected with the output interface and the power supply end of the control circuit; the output end of the control circuit is connected with the control end of the power output circuit so as to switch on or switch off the power output circuit. Through the passive compensation circuit formed by the external power factor compensation module, the overall power factor of the lighting equipment is improved, an active built-in compensation mode does not need to be adopted, the assembly convenience for improving the power factor of the low-power-factor lighting equipment is improved, and thus the cost is reduced.

Description

Technical Field

[0001] This disclosure relates to the field of lighting technology, and in particular to an external power factor compensation device for low power factor lighting equipment and a lighting equipment. Background Technology

[0002] With the popularization of LED lighting technology, low-power lighting products below 24W (such as LED bulbs, tubes, and downlights) have been widely used. Due to cost and control strategy considerations, these products typically employ simple rectifier bridge and capacitor filtering drive circuits, resulting in generally low power factors (PF), mostly around 0.5. A low power factor means that the equipment draws a large amount of reactive power from the grid, which not only increases grid transmission losses and leads to energy waste, but also increases the burden on the power supply transformer, potentially preventing the fulfillment of certain energy efficiency standards at the user end.

[0003] Currently, the main method for improving power factor is through internal modifications to the equipment, such as using active power factor correction (APFC) circuits. However, for the large number of existing low-power factor lighting products, internal modifications are neither economical nor practical. There is a lack of a simple, low-cost, plug-and-play external solution on the market for centralized or point-to-point power factor compensation of already installed low-power factor lighting equipment. Summary of the Invention

[0004] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide an external power factor compensation device and lighting equipment for low power factor lighting equipment that effectively improves the overall power factor and reduces costs.

[0005] The purpose of this disclosure is achieved through the following technical solution:

[0006] An external power factor compensation device for low power factor lighting equipment includes: an external power factor compensation housing and an external power factor compensation module; the external power factor compensation housing has an input interface and an output interface, the input interface is used to connect to a mains power supply, and the output interface is used to connect to the input terminal of at least one low power factor lighting equipment; the external power factor compensation module is disposed inside the external power factor compensation housing, and the external power factor compensation module includes an input protection circuit, an input EMC circuit, a rectifier filter circuit, a power output circuit, and a control circuit; the input terminal of the input protection circuit is connected to the input interface, the output terminal of the input protection circuit is connected to the input terminal of the input EMC circuit, the output terminal of the input EMC circuit is connected to the input terminal of the rectifier filter circuit, the output terminal of the rectifier filter circuit is connected to the input terminal of the power output circuit and the voltage detection terminal of the control circuit, the output terminal of the power output circuit is connected to the output interface and the power supply terminal of the control circuit, and the output terminal of the control circuit is connected to the control terminal of the power output circuit to turn the power output circuit on or off.

[0007] In one embodiment, the input protection circuit includes a fuse, a first thermistor, and a varistor. The first end of the fuse is connected to the live wire of the input interface, and the second end of the fuse is connected to the first end of the varistor. The first end of the first thermistor is connected to the neutral wire of the input interface, and the second end of the first thermistor is connected to the second end of the varistor. The varistor is connected in parallel to the input terminal of the input EMC circuit.

[0008] In one embodiment, the input EMC circuit includes a first Y capacitor, a second Y capacitor, a first X capacitor, a second X capacitor, a first common-mode inductor, a second common-mode inductor, a first discharge resistor, a second discharge resistor, and a second thermistor. The first terminal of the first Y capacitor is connected to the first output terminal of the input protection circuit, and the second terminal of the first Y capacitor is connected to a common terminal. The first terminal of the second Y capacitor is connected to the second output terminal of the input protection circuit, and the second terminal of the second Y capacitor is connected to a common terminal. The first terminal of the first X capacitor is connected to the first terminal of the first Y capacitor, and the second terminal of the first X capacitor is connected to the first terminal of the second Y capacitor. The first terminal of the first discharge resistor is connected to the first terminal of the first X capacitor, and the second terminal of the first discharge resistor is connected to the first terminal of the second discharge resistor. The second terminal of the second discharge resistor is connected to the first terminal of the second Y capacitor; the first terminal of the first common-mode inductor is connected to the first terminal of the first discharge resistor, the second terminal of the first common-mode inductor is connected to the second terminal of the second discharge resistor, the first terminal of the first common-mode inductor is connected to the first terminal of the second X capacitor, the second terminal of the first common-mode inductor is connected to the second terminal of the second X capacitor; the first terminal of the second common-mode inductor is connected to the first terminal of the first common-mode inductor, the second terminal of the second common-mode inductor is connected to the second terminal of the first common-mode inductor, the second terminal of the second common-mode inductor is connected to the first terminal of the second common-mode inductor, and the first terminal of the second common-mode inductor and the second terminal of the second thermistor are connected in parallel at the input terminal of the rectifier filter circuit.

[0009] In one embodiment, the rectifier-filter circuit includes a bridge rectifier, a differential-mode inductor, a differential-mode resistor, a first filter capacitor, a second filter capacitor, a third filter capacitor, and a fourth filter capacitor. The input terminal of the bridge rectifier is connected to the output terminal of the input EMC circuit. The first output terminal of the bridge rectifier is connected to the first terminal of the differential-mode inductor. The second terminal of the differential-mode inductor is connected to the input terminal of the power output circuit. The differential-mode resistor is connected in parallel with the differential-mode inductor. The first terminals of the first and second filter capacitors are both connected to the first output terminal of the bridge rectifier. The second terminals of the first and second filter capacitors are both connected to the second output terminal of the bridge rectifier and grounded. The first terminals of the third and fourth filter capacitors are both connected to the second terminal of the differential-mode inductor. The second terminals of the third and fourth filter capacitors are both grounded.

[0010] In one embodiment, the power output circuit includes an energy storage inductor, a fifth filter capacitor, a bypass diode, a bypass capacitor, a rectifier diode, a spike absorption resistor, a spike absorption capacitor, and a power electronic switch. The output terminal of the rectifier filter circuit is connected to the opposite terminal of the primary side of the energy storage inductor and the positive terminal of the bypass diode. The negative terminal of the bypass diode is connected to the first terminal of the spike absorption resistor. The bypass capacitor is connected in parallel with the bypass diode. The first terminal of the spike absorption resistor is connected to the same terminal of the primary side of the energy storage inductor through the bypass capacitor. The positive terminal of the rectifier diode is also connected to the negative terminal of the rectifier diode. The positive terminal of the rectifier diode is connected to the primary side of the energy storage inductor. The positive terminal of the rectifier diode is also connected to the first terminal of the power electronic switch. The second terminal of the power electronic switch is grounded. The control terminal of the power electronic switch is connected to the output terminal of the control circuit. The negative terminal of the rectifier diode is also connected to the first terminal of the fifth filter capacitor. The second terminal of the fifth filter capacitor is grounded. The first terminal of the fifth filter capacitor is also connected to the power supply terminal of the control circuit and the output interface, respectively.

[0011] In one embodiment, the control circuit includes a controller, a first electronic switch, a second electronic switch, a first Zener diode, a second Zener diode, a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor. The output terminal of the power output circuit is connected to the control terminal of the first electronic switch through the first resistor. The control terminal of the first electronic switch is connected to the negative terminal of the second Zener diode, and the positive terminal of the second Zener diode is grounded. The output terminal of the power output circuit is also connected to the first terminal of the first electronic switch through the second resistor. The second terminal of the first electronic switch is connected to the power supply terminal of the controller. The first terminal of the third resistor is connected to the output terminal of the rectifier and filter circuit. The second end of the third resistor is connected to the opposite-named terminal of the secondary side of the energy storage inductor. The second end of the third resistor is also connected to the same-named terminal of the secondary side of the energy storage inductor through the fourth resistor. The same-named terminal of the secondary side of the energy storage inductor is connected to the first end of the second electronic switch. The first end of the second electronic switch is connected to the control terminal of the second electronic switch through the fifth resistor. The control terminal of the second electronic switch is also connected to the negative terminal of the first Zener diode. The positive terminal of the first Zener diode is connected to the positive terminal of the first Zener diode. The second end of the second electronic switch is connected to the power supply terminal of the controller. The first end of the third resistor is also connected to the voltage detection terminal of the controller. The control output terminal of the controller is connected to the control terminal of the power electronic switch.

[0012] In one embodiment, the control circuit further includes a first anti-sinking diode and a second anti-sinking diode, the second terminal of the fourth resistor is connected to the anode of the first anti-sinking diode, the cathode of the first anti-sinking diode is connected to the secondary side terminal of the energy storage inductor, the cathode of the first anti-sinking diode is also connected to the anode of the second anti-sinking diode, and the cathode of the second anti-sinking diode is connected to the first terminal of the second electronic switch.

[0013] In one embodiment, the control circuit further includes a sixth resistor and an energy storage capacitor. The secondary side of the energy storage inductor is connected to the first end of the sixth resistor, and the second end of the sixth resistor is connected to the first end of the second electronic switch via the energy storage capacitor.

[0014] In one embodiment, the external power factor compensation module further includes an anti-interference circuit, which includes a third Y capacitor and a fourth Y capacitor. The first end of the fourth Y capacitor is connected to the output end of the power output circuit, and the second end of the fourth Y capacitor is connected to a common terminal. The first end of the third Y capacitor is grounded, and the second end of the third Y capacitor is connected to a common terminal.

[0015] A lighting device includes a power factor driver, an LED lamp, and an external power factor compensation device for low power factor lighting devices as described in any of the above embodiments. The input terminal of the external power factor compensation device is connected to mains power, the output terminal of the external power factor compensation device is connected to the input terminal of the power factor driver, and the output terminal of the power factor driver is connected to the power supply terminal of the LED lamp. The power factor of the power factor driver is less than the power factor of the external power factor compensation device.

[0016] Compared with the prior art, this disclosure has at least the following advantages:

[0017] By using an external power factor compensation module to form a passive compensation circuit, a passive compensation module is connected between the low power factor lighting equipment and the mains power, thereby improving the overall power factor of the lighting equipment. Moreover, this compensation device only needs to be external, without the need for an active built-in compensation method, which improves the ease of assembly for improving the power factor of low power factor lighting equipment and thus reduces costs. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of an external power factor compensation device for a low power factor lighting device in one embodiment;

[0020] Figure 2 This is a circuit diagram of an external power factor compensation module in one embodiment;

[0021] Figure 3 This is a circuit diagram of an input protection circuit in one embodiment;

[0022] Figure 4 This is a circuit diagram of the input EMC circuit 202 in one embodiment;

[0023] Figure 5 This is a circuit diagram of the rectifier filter circuit 203 in one embodiment;

[0024] Figure 6 This is a circuit diagram of the power output circuit 204 in one embodiment;

[0025] Figure 7 This is a circuit diagram of the control circuit in one embodiment;

[0026] Figure 8 This is a circuit diagram of an anti-interference circuit in one embodiment;

[0027] Figure 9 This is a schematic diagram of an external power factor compensation housing in one embodiment;

[0028] Figure 10 This is a schematic diagram of an external power factor compensation housing in another embodiment;

[0029] Figure 11 This is a schematic diagram of an external power factor compensation housing in another embodiment;

[0030] Figure 12 This is a schematic diagram of a lighting device in one embodiment. Detailed Implementation

[0031] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0032] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] This disclosure relates to an external power factor compensation device for low power factor lighting equipment. In one embodiment, the external power factor compensation device for low power factor lighting equipment includes an external power factor compensation housing and an external power factor compensation module. The external power factor compensation housing has an input interface and an output interface. The input interface is used to connect to a mains power supply, and the output interface is used to connect to the input terminal of at least one low power factor lighting equipment. The external power factor compensation module is disposed inside the external power factor compensation housing. The external power factor compensation module includes an input protection circuit, an input EMC circuit, a rectifier filter circuit, a power output circuit, and a control circuit. The input terminal of the input protection circuit is connected to the input interface, the output terminal of the input protection circuit is connected to the input terminal of the input EMC circuit, the output terminal of the input EMC circuit is connected to the input terminal of the rectifier filter circuit, the output terminal of the rectifier filter circuit is connected to the input terminal of the power output circuit and the voltage detection terminal of the control circuit, respectively, the output terminal of the power output circuit is connected to the output interface and the power supply terminal of the control circuit, and the output terminal of the control circuit is connected to the control terminal of the power output circuit to turn the power output circuit on or off. By using an external power factor compensation module to form a passive compensation circuit, a passive compensation module is connected between the low power factor lighting equipment and the mains power, thereby improving the overall power factor of the lighting equipment. Moreover, this compensation device only needs to be external, without the need for an active built-in compensation method, which improves the ease of assembly for improving the power factor of low power factor lighting equipment and thus reduces costs.

[0035] Please see Figure 1 This is a schematic diagram of the structure of an external power factor compensation device for a low power factor lighting device according to an embodiment of the present disclosure.

[0036] An embodiment of an external power factor compensation device 10 for low power factor lighting equipment includes an external power factor compensation housing 100. The housing 100 has an input interface CON1 and an output interface CON2. The input interface CON1 is used to connect to a mains power supply, and the output interface CON2 is used to connect to the input terminal of at least one low power factor lighting device. Please refer to the accompanying documentation. Figure 2 The external power factor compensation device 10 for low power factor lighting equipment further includes an external power factor compensation module 200. The external power factor compensation module 200 is disposed within the external power factor compensation housing 100. The external power factor compensation module 200 includes an input protection circuit 201, an input EMC circuit 202, a rectifier and filter circuit 203, a power output circuit 204, and a control circuit 206. The input terminal of the input protection circuit 201 is connected to the input interface CON1, and the output terminal of the input protection circuit 201 is connected to the input interface CON1. The input terminal of the input EMC circuit 202 is connected, and the output terminal of the input EMC circuit 202 is connected to the input terminal of the rectifier and filter circuit 203. The output terminal of the rectifier and filter circuit 203 is connected to the input terminal of the power output circuit 204 and the voltage detection terminal of the control circuit 206, respectively. The output terminal of the power output circuit 204 is connected to the output interface CON2 and the power supply terminal of the control circuit 206, respectively. The output terminal of the control circuit 206 is connected to the control terminal of the power output circuit 204 to turn the power output circuit 204 on or off.

[0037] In this embodiment, a passive compensation circuit formed by an external power factor compensation module 200 is used to connect a passive compensation module between the low power factor lighting device and the mains power, thereby improving the overall power factor of the lighting device. Moreover, this compensation device only needs to be external and does not require an active built-in compensation method, which improves the ease of assembly for improving the power factor of the low power factor lighting device and reduces costs.

[0038] In one embodiment, please refer to Figure 3The input protection circuit 201 includes a fuse F1, a first thermistor NTC1, and a varistor MOV1. The first terminal of the fuse F1 is connected to the live wire of the input interface CON1, and the second terminal of the fuse F1 is connected to the first terminal of the varistor MOV1. The first terminal of the first thermistor NTC1 is connected to the neutral wire of the input interface CON1, and the second terminal of the first thermistor NTC1 is connected to the second terminal of the varistor MOV1. The varistor MOV1 is connected in parallel to the input terminal of the input EMC circuit 202. In this embodiment, the fuse F1 provides current limiting protection for the input current, the first thermistor NTC1 senses the heating status of the fuse F1, and the varistor MOV1 senses the input voltage. These three components together constitute a lightning strike and overvoltage protection circuit to prevent damage to subsequent circuits from excessively high input voltage and lightning strikes, thereby improving the safety level of the external power factor compensation device.

[0039] In one embodiment, please refer to Figure 4The input EMC circuit 202 includes a first Y capacitor CY1, a second Y capacitor CY2, a first X capacitor CX1, a second X capacitor CX2, a first common-mode inductor LF1, a second common-mode inductor LF2, a first discharge resistor R1, a second discharge resistor R2, and a second thermistor NTC2. The first terminal of the first Y capacitor CY1 is connected to the first output terminal of the input protection circuit 201, and the second terminal of the first Y capacitor CY1 is connected to a common terminal. The first terminal of the second Y capacitor CY2 is connected to the second output terminal of the input protection circuit 201, and the second terminal of the second Y capacitor CY2 is connected to a common terminal. The first terminal of the first X capacitor CX1 is connected to the first terminal of the first Y capacitor CY1, and the second terminal of the first X capacitor CX1 is connected to the first terminal of the second Y capacitor CY2. The first terminal of the first discharge resistor R1 is connected to the first terminal of the first X capacitor CX1, and the second terminal of the first discharge resistor R1 is connected to the first terminal of the second discharge resistor R2. The second terminal of the second discharge resistor R2 is connected to the first terminal of the second Y capacitor CY2; the first terminal of the first common-mode inductor LF1 is connected to the first terminal of the first discharge resistor R1, the second terminal of the first common-mode inductor LF1 is connected to the second terminal of the second discharge resistor R2, the first terminal of the first common-mode inductor LF1 is connected to the first terminal of the second X capacitor CX2, and the second terminal of the first common-mode inductor LF1 is connected to the second terminal of the second X capacitor CX2; the first terminal of the second common-mode inductor LF2 is connected to the first terminal of the first common-mode inductor LF1, the second terminal of the second common-mode inductor LF2 is connected to the second terminal of the first common-mode inductor LF1, and the second terminal of the second common-mode inductor LF2 is connected to the first terminal of the second thermistor NTC2; the first terminal of the second common-mode inductor LF2 and the second terminal of the second thermistor NTC2 are connected in parallel at the input terminal of the rectifier filter circuit 203. In this embodiment, the first Y capacitor CY1, the second Y capacitor CY2, the first X capacitor CX1, the second X capacitor CX2, the first common-mode inductor LF1, the second common-mode inductor LF2, and the second thermistor NTC2 form an EMC circuit to improve the filtering capability of electromagnetic interference signals and meet EMC requirements. The first discharge resistor R1 and the second discharge resistor R2 are discharge resistors that can quickly release the energy in the first X capacitor CX1 and the second X capacitor CX2 within a specified time after the input power is cut off, avoiding voltage spikes.

[0040] In one embodiment, please refer to Figure 5The rectifier-filter circuit 203 includes a bridge rectifier, a differential-mode inductor L1, a differential-mode resistor R3, a first filter capacitor C1, a second filter capacitor C2, a third filter capacitor C3, and a fourth filter capacitor C4. The input terminal of the bridge rectifier is connected to the output terminal of the input EMC circuit 202. The first output terminal of the bridge rectifier is connected to the first terminal of the differential-mode inductor L1. The second terminal of the differential-mode inductor L1 is connected to the input terminal of the power output circuit 204. The differential-mode resistor R3 is connected in parallel with the differential-mode inductor L1. The first terminals of the first filter capacitor C1 and the second filter capacitor C2 are both connected to the first output terminal of the bridge rectifier. The second terminals of the first filter capacitor C1 and the second filter capacitor C2 are both connected to the second output terminal of the bridge rectifier and grounded. The first terminals of the third filter capacitor C3 and the fourth filter capacitor C4 are both connected to the second terminal of the differential-mode inductor L1. The second terminals of the third filter capacitor C3 and the fourth filter capacitor C4 are both grounded. In this embodiment, the bridge rectifier is formed by combining four diodes to perform full-wave rectification of the input current. Furthermore, the bridge rectifier, together with the differential-mode inductor L1, the differential-mode resistor R3, the first filter capacitor C1, the second filter capacitor C2, the third filter capacitor C3, and the fourth filter capacitor C4, forms a Π-type filter circuit to rectify and filter the AC power input from the input EMC circuit 202, thereby improving the utilization efficiency of mains power.

[0041] In one embodiment, please refer to Figure 6The power output circuit 204 includes an energy storage inductor T1, a fifth filter capacitor CE2, a bypass diode D5, a bypass capacitor C7, a rectifier diode D10, a spike absorption resistor R18, a spike absorption capacitor C10, and a power electronic switch Q3. The output terminal of the rectifier filter circuit 203 is connected to the opposite terminal of the primary side of the energy storage inductor T1 and the positive terminal of the bypass diode D5. The negative terminal of the bypass diode D5 is connected to the first terminal of the spike absorption resistor R18. The bypass capacitor C7 is connected in parallel with the bypass diode D5. The first terminal of the spike absorption resistor R18 is connected to the same terminal of the primary side of the energy storage inductor T1 through the bypass capacitor C7. The bypass diode D10... The positive terminal of diode D5 is also connected to the negative terminal of rectifier diode D10. The positive terminal of rectifier diode D10 is connected to the primary side of energy storage inductor T1. The positive terminal of rectifier diode D10 is also connected to the first terminal of power electronic switch Q3. The second terminal of power electronic switch Q3 is grounded. The control terminal of power electronic switch Q3 is connected to the output terminal of control circuit 206. The negative terminal of rectifier diode D10 is also connected to the first terminal of fifth filter capacitor CE2. The second terminal of fifth filter capacitor CE2 is grounded. The first terminal of fifth filter capacitor CE2 is also connected to the power supply terminal of control circuit 206 and the output interface CON2, respectively. In this embodiment, energy storage inductor T1 serves as an auxiliary power supply to control circuit 206, that is, the induced voltage of energy storage inductor T1 provides part of the power supply voltage to control circuit 206. Fifth filter capacitor CE2 filters the output voltage to improve the power supply stability to lighting equipment and control circuit 206. The fifth filter capacitor CE2, the bypass diode D5, the bypass capacitor C7, the rectifier diode D10, the spike absorption resistor R18, and the spike absorption capacitor C10 are all located on the primary side of the energy storage inductor T1, facilitating the output of a stable DC voltage to power the load. The power electronic switch Q3 acts as the output switch for the power output circuit 204. The control circuit 206 adjusts the output state of the power output circuit 204 in a timely manner according to the voltage state at the voltage detection terminal, that is, controls the output of the power output circuit 204 to be turned on or off, thereby achieving precise output to the lighting equipment.

[0042] In another embodiment, the fifth filter capacitor CE2 is an electrolytic capacitor.

[0043] In another embodiment, the power electronic switch Q3 is an N-type MOS transistor, the first terminal of the power electronic switch Q3 is the drain of the N-type MOS transistor, the second terminal of the power electronic switch Q3 is the source of the N-type MOS transistor, and the control terminal of the power electronic switch Q3 is the gate of the N-type MOS transistor.

[0044] In one embodiment, please refer to Figure 7 The control circuit 206 includes a controller U1, a first electronic switch Q1, a second electronic switch Q2, a first Zener diode ZD1, a second Zener diode ZD2, a first resistor R4, a second resistor R5, a third resistor R11, a fourth resistor R14, and a fifth resistor R15. The output terminal of the power output circuit 204 is connected to the control terminal of the first electronic switch Q1 through the first resistor R4. The control terminal of the first electronic switch Q1 is connected to the negative terminal of the second Zener diode ZD2, and the positive terminal of the second Zener diode ZD2 is grounded. The output terminal of the power output circuit 204 is also connected to the first terminal of the first electronic switch Q1 through the second resistor R5. The second terminal of the first electronic switch Q1 is connected to the power supply terminal of the controller U1. The first terminal of the third resistor R11 is connected to the output terminal of the rectifier and filter circuit 203. The second end of the third resistor R11 is connected to the opposite-named terminal of the secondary side of the energy storage inductor T1. The second end of the third resistor R11 is also connected to the same-named terminal of the secondary side of the energy storage inductor T1 through the fourth resistor R14. The same-named terminal of the secondary side of the energy storage inductor T1 is connected to the first end of the second electronic switch Q2. The first end of the second electronic switch Q2 is connected to the control terminal of the second electronic switch Q2 through the fifth resistor R15. The control terminal of the second electronic switch Q2 is also connected to the negative terminal of the first Zener diode ZD1. The positive terminal of the first Zener diode ZD1 is connected to the power supply terminal of the controller U1. The first end of the third resistor R11 is also connected to the voltage detection terminal of the controller U1. The control output terminal of the controller U1 is connected to the control terminal of the power electronic switch Q3. In this embodiment, the controller U1 serves as the main control component for the power output circuit 204. The controller U1 detects the main line voltage of the power output circuit 204 through the third resistor R11, which facilitates the control of the output power of the power output circuit 204 and thus adjusts the power factor. Specifically, after the controller U1 performs calculations by detecting the input voltage and current signals, the output PMW controls the on and off of the power electronic switch Q3 through the control output terminal of the controller U1 to achieve the power factor compensation function.

[0045] In another embodiment, the first electronic switch Q1 is an N-type MOS transistor, the first terminal of the first electronic switch Q1 is the drain of the N-type MOS transistor, the second terminal of the first electronic switch Q1 is the source of the N-type MOS transistor, and the control terminal of the first electronic switch Q1 is the gate of the N-type MOS transistor.

[0046] In another embodiment, the second electronic switch Q2 is an NPN transistor, the first segment of the second electronic switch Q2 is the collector of the NPN transistor, the second terminal of the second electronic switch Q2 is the emitter of the NPN transistor, and the control terminal of the second electronic switch Q2 is the base of the NPN transistor.

[0047] Furthermore, the control circuit 206 also includes a first anti-current diode D6 and a second anti-current diode D8. The second terminal of the fourth resistor R14 is connected to the anode of the first anti-current diode D6, the cathode of the first anti-current diode D6 is connected to the corresponding terminal on the secondary side of the energy storage inductor T1, the cathode of the first anti-current diode D6 is also connected to the anode of the second anti-current diode D8, and the cathode of the second anti-current diode D8 is connected to the first terminal of the second electronic switch Q2. In this embodiment, the first anti-current diode D6 and the second anti-current diode D8 are connected in series, that is, located between the fourth resistor R14 and the first terminal of the second electronic switch Q2, to prevent current from flowing back from the first terminal of the second electronic switch Q2 to the secondary side of the energy storage inductor T1, thereby ensuring the normal operation of the energy storage inductor T1.

[0048] In another embodiment, the control circuit 206 further includes a sixth resistor R16 and an energy storage capacitor C8. The secondary side of the energy storage inductor T1 is connected to the first terminal of the sixth resistor R16, and the second terminal of the sixth resistor R16 is connected to the first terminal of the second electronic switch Q2 through the energy storage capacitor C8. In this embodiment, the sixth resistor R16 limits the output current of the secondary side of the energy storage inductor T1. The energy storage capacitor C8 is connected in series with the sixth resistor R16, stores electrical energy, isolates the secondary side of the energy storage inductor T1 from the first terminal of the second electronic switch Q2, and also provides the steady-state operating point voltage for the first terminal of the second electronic switch Q2, ensuring the normal conduction or cutoff of the second electronic switch Q2.

[0049] In another embodiment, the controller is model BP2638C.

[0050] In one embodiment, please refer to Figure 8The external power factor compensation module 200 further includes an anti-interference circuit 205, which includes a third Y capacitor CY3 and a fourth Y capacitor CY4. The first terminal of the fourth Y capacitor CY4 is connected to the output terminal of the power output circuit 204, and the second terminal of the fourth Y capacitor CY4 is connected to a common terminal. The first terminal of the third Y capacitor CY3 is grounded, and the second terminal of the third Y capacitor CY3 is connected to a common terminal. In this embodiment, the third Y capacitor CY3 and the fourth Y capacitor CY4 form a common-mode rejection circuit, which plays a common-mode rejection role on the output of the power output circuit 204, thereby improving the output stability of the power output circuit 204.

[0051] In another embodiment, the external power factor compensation housing is provided with a structure for fixing, such as mounting holes or clips.

[0052] In another embodiment, the external power factor compensation housing is made of flame-retardant material, and the external power factor compensation housing has heat dissipation holes.

[0053] In another embodiment, the external power factor compensation housing is an 86-type chassis mounting type, such as... Figure 9 As shown, it can be pre-embedded together with the switch panel.

[0054] In another embodiment, the external power factor compensation housing adopts a borderless pre-embedded structure, such as... Figure 10 As shown, existing ceiling embedded parts are replaced to achieve a concealed effect without disrupting the interior design style.

[0055] In another embodiment, the external power factor compensation enclosure is a circuit breaker or air switch type, such as... Figure 11 As shown, the entire circuit can be modified within the pre-installed distribution box.

[0056] In one embodiment, this disclosure also provides a lighting device, see [link to relevant documentation]. Figure 12The lighting device 20 includes a power factor driver 300, an LED lamp 400, and an external power factor compensation device 10 for low power factor lighting devices as described in any of the above embodiments. The input terminal of the external power factor compensation device 10 is connected to the mains power, the output terminal of the external power factor compensation device 10 is connected to the input terminal of the power factor driver 300, and the output terminal of the power factor driver 300 is connected to the power supply terminal of the LED lamp 400. The power factor of the power factor driver 300 is less than the power factor of the external power factor compensation device 10. In this embodiment, the external power factor compensation device 10 for low power factor lighting equipment includes an external power factor compensation housing and an external power factor compensation module; the external power factor compensation housing has an input interface and an output interface, the input interface is used to connect to a mains power supply, and the output interface is used to connect to the input terminal of at least one low power factor lighting device; the external power factor compensation module is disposed inside the external power factor compensation housing, and the external power factor compensation module includes an input protection circuit, an input EMC circuit, a rectifier filter circuit, and a power output circuit. The system includes a control circuit. The input terminal of the input protection circuit is connected to the input interface. The output terminal of the input protection circuit is connected to the input terminal of the input EMC circuit. The output terminal of the input EMC circuit is connected to the input terminal of the rectifier and filter circuit. The output terminal of the rectifier and filter circuit is connected to the input terminal of the power output circuit and the voltage detection terminal of the control circuit. The output terminal of the power output circuit is connected to the output interface and the power supply terminal of the control circuit. The output terminal of the control circuit is connected to the control terminal of the power output circuit to turn the power output circuit on or off. A passive compensation circuit formed by an external power factor compensation module connects a passive compensation module between the low power factor lighting equipment and the mains power, thereby improving the overall power factor of the lighting equipment. Moreover, this compensation device only needs to be external, eliminating the need for an active built-in compensation method, which improves the ease of assembly for improving the power factor of low power factor lighting equipment and reduces costs.

[0057] In another embodiment, the power factor driver is a driver for a low power factor lighting device, wherein the power factor of the power factor driver is 0.4 to 0.6, and the power of the LED lamp is less than or equal to 24W. Through the external power factor compensation device, the power factor of the entire lighting device is increased to above 0.9.

[0058] In another embodiment, the power factor driver is a constant voltage driver or a constant current driver. For example, the constant voltage driver has a power of 300W and a power factor of 0.5; or the constant current driver has a power of 300W and a power factor of 0.5.

[0059] In another embodiment, the low power factor lighting device includes any one of spotlights, downlights, ceiling lights, and magnetic lights.

[0060] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. An external power factor compensation device for low power factor lighting equipment, characterized in that, include: An external power factor compensation housing has an input interface and an output interface. The input interface is used to connect to an AC power supply, and the output interface is used to connect to the input terminal of at least one low power factor lighting device. An external power factor compensation module is disposed within an external power factor compensation housing. The external power factor compensation module includes an input protection circuit, an input EMC circuit, a rectifier and filter circuit, a power output circuit, and a control circuit. The input terminal of the input protection circuit is connected to the input interface, and the output terminal of the input protection circuit is connected to the input terminal of the input EMC circuit. The output terminal of the input EMC circuit is connected to the input terminal of the rectifier and filter circuit. The output terminal of the rectifier and filter circuit is connected to the input terminal of the power output circuit and the voltage detection terminal of the control circuit. The output terminal of the power output circuit is connected to the output interface and the power supply terminal of the control circuit. The output terminal of the control circuit is connected to the control terminal of the power output circuit to turn the power output circuit on or off.

2. The external power factor compensation device for low power factor lighting equipment according to claim 1, characterized in that, The input protection circuit includes a fuse, a first thermistor, and a varistor. The first end of the fuse is connected to the live wire of the input interface, and the second end of the fuse is connected to the first end of the varistor. The first end of the first thermistor is connected to the neutral wire of the input interface, and the second end of the first thermistor is connected to the second end of the varistor. The varistor is connected in parallel to the input terminal of the input EMC circuit.

3. The external power factor compensation device for low power factor lighting equipment according to claim 1, characterized in that, The input EMC circuit includes a first Y capacitor, a second Y capacitor, a first X capacitor, a second X capacitor, a first common-mode inductor, a second common-mode inductor, a first discharge resistor, a second discharge resistor, and a second thermistor. The first terminal of the first Y capacitor is connected to the first output terminal of the input protection circuit, and the second terminal of the first Y capacitor is connected to a common terminal. The first terminal of the second Y capacitor is connected to the second output terminal of the input protection circuit, and the second terminal of the second Y capacitor is connected to a common terminal. The first terminal of the first X capacitor is connected to the first terminal of the first Y capacitor, and the second terminal of the first X capacitor is connected to the first terminal of the second Y capacitor. The first terminal of the first discharge resistor is connected to the first terminal of the first X capacitor, and the second terminal of the first discharge resistor is connected to the first terminal of the second discharge resistor. The second terminal of the resistor is connected to the first terminal of the second Y capacitor; the first terminal of the first common-mode inductor is connected to the first terminal of the first discharge resistor, the second terminal of the first common-mode inductor is connected to the second terminal of the second discharge resistor, the first terminal of the first common-mode inductor is connected to the first terminal of the second X capacitor, the second terminal of the first common-mode inductor is connected to the second terminal of the second X capacitor; the first terminal of the second common-mode inductor is connected to the first terminal of the first common-mode inductor, the second terminal of the second common-mode inductor is connected to the second terminal of the first common-mode inductor, the second terminal of the second common-mode inductor is connected to the first terminal of the second thermistor, and the first terminal of the second common-mode inductor and the second terminal of the second thermistor are connected in parallel at the input terminal of the rectifier filter circuit.

4. The external power factor compensation device for low power factor lighting equipment according to claim 1, characterized in that, The rectifier and filter circuit includes a bridge rectifier, a differential-mode inductor, a differential-mode resistor, a first filter capacitor, a second filter capacitor, a third filter capacitor, and a fourth filter capacitor. The input terminal of the bridge rectifier is connected to the output terminal of the input EMC circuit. The first output terminal of the bridge rectifier is connected to the first terminal of the differential-mode inductor. The second terminal of the differential-mode inductor is connected to the input terminal of the power output circuit. The differential-mode resistor is connected in parallel with the differential-mode inductor. The first terminal of the first filter capacitor and the first terminal of the second filter capacitor are both connected to the first output terminal of the bridge rectifier. The second terminal of the first filter capacitor and the second terminal of the second filter capacitor are both connected to the second output terminal of the bridge rectifier and grounded. The first terminal of the third filter capacitor and the first terminal of the fourth filter capacitor are both connected to the second terminal of the differential mode inductor. The second terminals of the third filter capacitor and the second terminals of the fourth filter capacitor are both grounded.

5. The external power factor compensation device for low power factor lighting equipment according to claim 1, characterized in that, The power output circuit includes an energy storage inductor, a fifth filter capacitor, a bypass diode, a bypass capacitor, a rectifier diode, a spike absorption resistor, a spike absorption capacitor, and a power electronic switch. The output terminal of the rectifier filter circuit is connected to the opposite terminal of the primary side of the energy storage inductor and the positive terminal of the bypass diode. The negative terminal of the bypass diode is connected to the first terminal of the spike absorption resistor. The bypass capacitor is connected in parallel with the bypass diode. The first terminal of the spike absorption resistor is connected to the same terminal of the primary side of the energy storage inductor through the bypass capacitor. The bypass diode... The positive terminal is also connected to the negative terminal of the rectifier diode, the positive terminal of the rectifier diode is connected to the primary side of the energy storage inductor, the positive terminal of the rectifier diode is also connected to the first terminal of the power electronic switch, the second terminal of the power electronic switch is grounded, and the control terminal of the power electronic switch is connected to the output terminal of the control circuit; the negative terminal of the rectifier diode is also connected to the first terminal of the fifth filter capacitor, the second terminal of the fifth filter capacitor is grounded, and the first terminal of the fifth filter capacitor is also connected to the power supply terminal of the control circuit and the output interface respectively.

6. The external power factor compensation device for low power factor lighting equipment according to claim 5, characterized in that, The control circuit includes a controller, a first electronic switch, a second electronic switch, a first Zener diode, a second Zener diode, a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor. The output terminal of the power output circuit is connected to the control terminal of the first electronic switch through the first resistor. The control terminal of the first electronic switch is connected to the negative terminal of the second Zener diode, and the positive terminal of the second Zener diode is grounded. The output terminal of the power output circuit is also connected to the first terminal of the first electronic switch through the second resistor. The second terminal of the first electronic switch is connected to the power supply terminal of the controller. The first terminal of the third resistor is connected to the output terminal of the rectifier and filter circuit. The second end of the third resistor is connected to the opposite-named terminal of the secondary side of the energy storage inductor. The second end of the third resistor is also connected to the same-named terminal of the secondary side of the energy storage inductor through the fourth resistor. The same-named terminal of the secondary side of the energy storage inductor is connected to the first end of the second electronic switch. The first end of the second electronic switch is connected to the control terminal of the second electronic switch through the fifth resistor. The control terminal of the second electronic switch is also connected to the negative terminal of the first Zener diode. The positive terminal of the first Zener diode is connected to the positive terminal of the first Zener diode. The second end of the second electronic switch is connected to the power supply terminal of the controller. The first end of the third resistor is also connected to the voltage detection terminal of the controller. The control output terminal of the controller is connected to the control terminal of the power electronic switch.

7. The external power factor compensation device for low power factor lighting equipment according to claim 6, characterized in that, The control circuit further includes a first anti-sinking diode and a second anti-sinking diode. The second terminal of the fourth resistor is connected to the anode of the first anti-sinking diode. The cathode of the first anti-sinking diode is connected to the same terminal on the secondary side of the energy storage inductor. The cathode of the first anti-sinking diode is also connected to the anode of the second anti-sinking diode. The cathode of the second anti-sinking diode is connected to the first terminal of the second electronic switch.

8. The external power factor compensation device for low power factor lighting equipment according to claim 6, characterized in that, The control circuit also includes a sixth resistor and an energy storage capacitor. The secondary side of the energy storage inductor is connected to the first end of the sixth resistor, and the second end of the sixth resistor is connected to the first end of the second electronic switch through the energy storage capacitor.

9. The external power factor compensation device for low power factor lighting equipment according to claim 1, characterized in that, The external power factor compensation module also includes an anti-interference circuit, which includes a third Y capacitor and a fourth Y capacitor. The first end of the fourth Y capacitor is connected to the output end of the power output circuit, and the second end of the fourth Y capacitor is connected to a common terminal. The first end of the third Y capacitor is grounded, and the second end of the third Y capacitor is connected to a common terminal.

10. A lighting device, characterized in that, The device includes a power factor driver, an LED luminaire, and an external power factor compensation device for low power factor lighting equipment as described in any one of claims 1 to 9. The input terminal of the external power factor compensation device is connected to mains power, the output terminal of the external power factor compensation device is connected to the input terminal of the power factor driver, and the output terminal of the power factor driver is connected to the power supply terminal of the LED luminaire. The power factor of the power factor driver is less than the power factor of the external power factor compensation device.

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