CN111712013A - Protection device for lighting assembly, lighting assembly and protection method thereof - Google Patents
Protection device for lighting assembly, lighting assembly and protection method thereof Download PDFInfo
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- CN111712013A CN111712013A CN202010661221.9A CN202010661221A CN111712013A CN 111712013 A CN111712013 A CN 111712013A CN 202010661221 A CN202010661221 A CN 202010661221A CN 111712013 A CN111712013 A CN 111712013A
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000001514 detection method Methods 0.000 claims abstract description 135
- 239000003990 capacitor Substances 0.000 claims description 58
- 230000001681 protective effect Effects 0.000 claims 3
- 238000005286 illumination Methods 0.000 abstract description 5
- 230000000903 blocking effect Effects 0.000 description 7
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- 238000010586 diagram Methods 0.000 description 4
- 206010014357 Electric shock Diseases 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000010891 electric arc Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The invention provides a protection device of an illumination assembly, the illumination assembly and a protection method thereof, wherein the illumination assembly comprises an LED light source, a first end lamp cap and a second end lamp cap, the protection device comprises a first detection module, a second detection module and a driving module, the first detection module and the second detection module are respectively used for detecting the connection state of the first end lamp cap and the second end lamp cap and outputting a first detection signal and a second detection signal, and the driving module is connected with the LED light source and is used for operating the LED light source based on the first detection signal and the second detection signal.
Description
Technical Field
The present invention relates to a lighting device, and more particularly, to a protection device for a lighting module, a lighting module and a protection method thereof.
Background
LED light sources have gained widespread attention and use due to their small size, high brightness, low power consumption, and long service life.
For an LED lighting assembly with lamp caps at two ends, power is supplied by a power supply device (e.g., a ballast or a commercial power direct) in a stable state, and after power is supplied, alternating current is supplied to an LED light source in a lamp tube through the lamp caps. If one end of the lamp holder is not installed well, the lamp holder has the risk of electric leakage, the circuit inside the lamp tube can be damaged, safety accidents such as smoking and fire of the lamp holder and the like can be caused by arc discharge, and even the risk of electric shock can be caused to installation personnel.
Disclosure of Invention
The protection device of the lighting assembly provided by the invention can turn off the lamp tube under the condition that the lamp tube is installed incorrectly (for example, the lamp holder is not installed), so that the LED light source does not work, thereby providing safety protection for people and preventing electric shock, and on the other hand, the protection device can also provide protection for other devices or circuits in the lamp tube, and can prevent the lamp holder from arcing.
The invention provides a protection device of an illumination assembly, wherein the illumination assembly comprises an LED light source, a first end lamp cap and a second end lamp cap, the protection device comprises a first detection module, a second detection module and a driving module, the first detection module and the second detection module are respectively used for detecting the connection state of the first end lamp cap and the second end lamp cap and outputting a first detection signal and a second detection signal, and the driving module is connected with the LED light source and is used for controlling the LED light source to work based on the first detection signal and the second detection signal.
Specifically, the first end lamp holder comprises a first pin and a second pin, and the first detection module comprises a first capacitor connected with the first pin and the second pin, so as to detect whether an alternating current signal passes through the first capacitor.
Specifically, when no ac signal passes through the first capacitor, the first end lamp is in an off state, and the first detection signal is at a low level, and when an ac signal passes through the first capacitor, the first end lamp is in an on state, and the first detection signal is at a pulse or a high level.
Specifically, the second lamp holder includes a third pin and a fourth pin, and the second detection module includes a second capacitor connected to the third pin and the fourth pin, so as to detect whether an ac signal passes through the second capacitor.
Specifically, when no ac signal passes through the second capacitor, the second lamp cap is in the off state, the second detection signal is at a low level, and when an ac signal passes through the second capacitor, the second lamp cap is in the on state, and the second detection signal is at a pulse or a high level.
Specifically, the driving module includes a control switch, and the on or off of the control switch can control the LED light source to operate or not operate.
Specifically, the driving module further includes a trigger circuit, and the trigger circuit is connected to the control switch and configured to generate a control signal based on the first detection signal and the second detection signal to control the control switch to be turned on or off.
Specifically, when the first detection signal and the second detection signal are both pulse or high level, the control switch is turned on to enable the LED light source to operate, and when at least one of the first detection signal and the second detection signal is low level, the control switch is turned off to enable the LED light source not to operate.
Specifically, the trigger circuit includes a first switch, a second switch and a third switch, a first end of the first switch is configured to receive the first detection signal, a first end of the second switch is configured to receive the second detection signal, a first end of the third switch is connected to a second end of the first switch and a second end of the second switch, and a second end of the third switch is connected to the driving end of the control switch.
Specifically, when the first detection signal and the second detection signal are both pulse or high level, the first switch and the second switch are turned on, the third switch is turned off, and the control switch is turned on.
Specifically, when at least one of the first detection signal and the second detection signal is at a low level, at least one of the first switch and the second switch is turned off, the third switch is turned on, and the control switch is turned off.
Specifically, the driving module further includes a delay circuit for turning on the control switch within a preset time after the power is turned on.
Specifically, the delay circuit is reset when at least one of the first detection signal and the second detection signal is at a low level.
Specifically, the LED lamp further comprises a rectifying module which is connected between the LED light source and the first end lamp cap and the second end lamp cap and is used for converting alternating current into direct current to be supplied to the LED light source.
The invention also provides a lighting assembly comprising a protection device as described above.
The invention also provides a protection method of the lighting assembly, the lighting assembly comprises an LED light source, a first end lamp cap and a second end lamp cap, the protection method comprises the steps of detecting the connection state of the first end lamp cap and the second end lamp cap to output a first detection signal and a second detection signal, and controlling the LED light source to work based on the first detection signal and the second detection signal.
Other features and aspects will become apparent from the following detailed description, the accompanying drawings, and the claims.
Drawings
The invention may be better understood by describing exemplary embodiments thereof in conjunction with the following drawings, in which:
FIG. 1 is a schematic view of a lighting assembly of some embodiments of the present invention;
FIG. 2 is a circuit schematic of a lighting assembly of some embodiments of the present invention;
FIG. 3 is a schematic diagram of a detection module of some embodiments of the present invention; and
fig. 4 is a flow chart of a method of protecting a lighting assembly of some embodiments of the present invention.
Detailed Description
While specific embodiments of the invention will be described below, it should be noted that in the course of the detailed description of these embodiments, in order to provide a concise and concise description, all features of an actual implementation may not be described in detail. It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions are made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another. Moreover, it should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another.
The use of "first," "second," and similar terms in the description and claims of the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The terms "a" or "an," and the like, do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprising" or "comprises" and its equivalent, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, nor are they restricted to direct or indirect connections.
The lighting assemblies of the present application include, but are not limited to, Light Emitting Diode (LED) lamps, Organic Light Emitting Diode (OLED) lamps, fluorescent lamps, and High Intensity Discharge (HID) lamps. The LED lamp will be described in detail below as an example.
Fig. 1 shows a schematic diagram of a lighting assembly of some embodiments of the present invention, and fig. 2 shows a specific circuit diagram of a lighting assembly 2 of some embodiments of the present invention. As shown in fig. 1-2, the lighting assembly 100 includes a first end cap 101 and a second end cap 102, an LED light source 103, and a protection device 110, where the protection device 110 includes a first detection module 111, a second detection module 112, and a driving module 113, the first detection module 111 and the second detection module 112 are respectively configured to detect a connection state of the first end cap 101 and the second end cap 102 and output a first detection signal and a second detection signal, and the driving module 113 is connected to the LED light source 103 and is configured to control the LED light source 103 to operate based on the first detection signal and the second detection signal.
The first detecting module 111 is connected to the first end cap 101 for detecting a connection state of the first end cap 101 to output a first detecting signal (a shown in fig. 2), and the second detecting module 112 is connected to the second end cap 102 for detecting a connection state of the second end cap 102 to output a second detecting signal (B shown in fig. 2).
Specifically, the term "connected state" refers to an electrically connected state of on or off, wherein the on state represents that the base is installed and an ac signal passes through the base, and the off state represents that the base is not installed and no ac signal passes through the base.
Specifically, the first end cap 101 includes a first pin 201 and a second pin 202, and the second end cap 102 includes a third pin 203 and a fourth pin 204.
The first detection module 111 comprises a first capacitor C1 connected to the first pin 201 and the second pin 202 for detecting whether an ac signal passes through the first capacitor C1. When no ac signal passes through the first capacitor C1, it indicates that the first end cap 101 is not installed and is in the off state, the output first detection signal is at a low level, and when an ac signal passes through the first capacitor C1, it indicates that the first end cap 101 is installed and is in the on state, the output first detection signal is at a pulse or a high level. Specifically, the pulses are periodic pulses, the frequency of the periodic pulses depends on the natural frequency of the ballast connected to the lamp head, and the high level is obtained by integrating the pulses.
Specifically, the first detection module 111 includes a first dc blocking circuit 211, and the first dc blocking circuit 211 further includes diodes D1 and D2 connected in series between the first pin 201 and the second pin 202 in addition to a first capacitor C1, wherein one end of the first capacitor C1 is connected to a connection point between the diode D1 and the diode D2, and the other end of the first capacitor C1 is configured to output the first detection signal a, wherein a positive terminal of the diode D1 is connected to the first pin 201, a negative terminal of the diode D1 is connected to a positive terminal of the diode D2, and a negative terminal of the diode D2 is connected to the second pin 202. When the first end cap 101 is installed, an ac signal passes through the first end cap 101, that is, an ac signal or an ac current passes through the first capacitor C1, and the first detection signal output from the point a is a pulse or a high level.
Similarly, the second detecting module 112 includes a second capacitor C2 connected to the third pin 203 and the fourth pin 204 for detecting whether an ac signal passes through the second capacitor C2. When no ac signal passes through the second capacitor C2, it indicates that the second end cap 102 is not installed and is in the off state, the second detection signal is at a low level, and when an ac signal passes through the second capacitor C2, it indicates that the second end cap 102 is installed and is in the on state, the second detection signal is at a pulse or a high level.
Specifically, the second detection module 112 includes a second dc blocking circuit 212, and the second dc blocking circuit 212 further includes diodes D3 and D4 connected in series between the third pin 203 and the fourth pin 204 in addition to a second capacitor C2, wherein one end of the second capacitor C2 is connected to a connection point between the diode D3 and the diode D4, and the other end of the second capacitor C2 is used for outputting the second detection signal B, wherein a positive end of the diode D3 is connected to the third pin 203, a negative end of the diode D3 is connected to a positive end of the diode D4, and a negative end of the diode D3 is connected to the fourth pin 204. When the second end cap 102 is installed, an ac signal passes through the second end cap 102, i.e., an ac signal or an ac current passes through the second capacitor C2, the second detection signal output from the point B is a pulse or a high level.
Although some embodiments of the present invention disclose the use of blocking capacitors (i.e., the first capacitor and the second capacitor) to detect the connection status of the first end cap and the second end cap, it should be understood by those skilled in the art that other ways may be used to detect, for example, but not limited to, detecting a voltage or current signal applied between two pins of the cap, detecting a voltage or current of a loop, or detecting whether the other end of the cap is accessible by releasing an electrical signal from the one end cap, etc.
In some embodiments, the driving module 113 includes a control switch 121, and the on or off of the control switch 121 can control the LED light source 103 to operate or not operate. Specifically, taking a MOSFET as an example, the second terminal (drain d) of the control switch 121 is connected to the negative terminal of the LED light source 103, the third terminal (source s) of the control switch 121 is connected to ground, when the control switch 121 is turned on, a circuit where the LED light source 103 is located is turned on, the LED light source 103 can normally operate, and when the control switch 121 is turned off, the circuit where the LED light source 103 is located is turned off, and the LED light source 103 cannot operate.
The control switch 121 may be, for example, a metal oxide semiconductor field effect transistor (mosfet), a Bipolar Junction Transistor (BJTs), a thyristor, a relay, or an LED control device such as a switching power supply or a linear power supply.
In some embodiments, the driving module 113 further includes a trigger circuit 122, and the trigger circuit 122 is connected to the control switch 121 for generating a control signal (or a trigger signal) based on the first detection signal and the second detection signal to control (or trigger) the control switch 121 to be turned on or off. Specifically, the output terminal of the trigger circuit 122 is connected to the first terminal (i.e., the gate g) of the control switch 121 to provide a control signal or a trigger signal to the first terminal of the control switch.
When the first detection signal and the second detection signal are both a pulse or a high level, the trigger circuit 122 outputs a control signal (a high level) to trigger the control switch 121 to be turned on so as to enable the LED light source 101 to operate, and when at least one of the first detection signal and the second detection signal is a low level, the trigger circuit outputs a control signal (a low level) to trigger the control switch 121 to be turned off so as to enable the LED light source 103 to be inoperative, where the low level at this time is a low level without a pulse signal, and specifically, is a low level lasting for a preset time.
In some embodiments, the trigger circuit 122 includes a first switch T1, a second switch T2, and a third switch T3, a first terminal of the first switch T1 is configured to receive the first detection signal a, a first terminal of the second switch T2 is configured to receive the second detection signal B, a first terminal of the third switch T3 is connected to a second terminal of the first switch T1 and a second terminal of the second switch T2, and a second terminal of the third switch T3 is an output terminal of the trigger circuit, which is connected to a driving terminal (i.e., a first terminal or a gate) of the control switch 121. Further, the third terminal of the first switch T1, the third terminal of the second switch T2 and the third terminal of the third switch T3 are connected to ground, respectively.
Specifically, the trigger circuit 122 further includes a capacitor C3 connected in parallel with the first switch T1, and a capacitor C4 connected in parallel with the second switch T2, so that when the detection signal is low, the power Vcc can charge the corresponding capacitor. In addition, the trigger circuit 122 further includes a diode D11 connected between the second terminal of the first switch T1 and the first terminal of the third switch T3, and a diode D12 connected between the second terminal of the second switch T2 and the first terminal of the third switch.
The first switch T1, the second switch T2, and the third switch T3 are all configured to turn on when the voltage at the first terminal is greater than the voltage at the third terminal. That is, when the first detection signal is a pulse, the first switch T1 may be turned on, specifically, the first switch T1 is turned on periodically, and at this time, the first terminal and the third terminal of the third switch T3 are equivalent to a short circuit, the third switch T3 is turned off, and since the third switch T3 is turned off, the voltage of the first terminal of the control switch 121 is higher than the voltage of the third terminal, and the control switch 121 may be turned on.
When the first detection signal is at a low level without a pulse, the first switch T1 is turned off, at this time, the power Vcc may charge the capacitor C3 connected to the first switch T1, and when the capacitor C3 is charged to a predetermined value, the diode D11 is turned on, at this time, the voltage of the first terminal of the third switch T3 is higher than the voltage of the third terminal, the third switch T3 is turned on, and the turning on of the third switch T3 causes a short circuit between the first terminal and the third terminal of the control switch 121, so that the control switch 121 is turned off.
Specifically, when the first detection signal outputs a periodic pulse, and a part of the time is at a low level, the capacitor C3 is charged, and the preset time for charging the capacitor C3 to turn on the diode D11 is configured to be shorter than the duration of the low level in the periodic pulse, so that the control switch 121 can be ensured to be kept in a conducting state when the first detection signal is a periodic pulse (i.e., the first terminal is in a conducting state).
Similarly, when the second detection signal is pulsed or at a high level, the second switch T2 may be turned on, and at this time, the short circuit is formed between the first terminal and the third terminal of the third switch T3, the third switch T3 is turned off, and the control switch 121 may be turned on.
When the second detection signal is at a low level without pulse, the second switch T2 is turned off, at this time, the power Vcc may charge the capacitor C4 connected to the second switch T2, and when the capacitor C4 is charged to a predetermined value, the diode D12 is turned on, at this time, the voltage at the first end of the third switch T3 is greater than the voltage at the third end, the third switch T3 is turned on, and the switch 121 is controlled to be turned off.
Therefore, when both the first and second detection signals are pulsed or high level, the first and second switches T1 and T2 are turned on, the third switch T3 is turned off, and the control switch 121 is turned on; when at least one of the first and second detection signals is at a low level without a pulse, at least one of the first and second switches T1 and T2 is turned off, the third switch T3 is turned on, and the control switch 121 is turned off. Specifically, as long as one of the two detection signals is at a low level, the control switch 121 is turned off, and the LED light source cannot operate, that is, as long as one end of the lamp cap is not installed, the LED light source cannot operate normally. Through the arrangement, the risk caused by electric leakage can be avoided, and the circuit in the lamp tube can be protected.
In some embodiments, the driving module 113 further includes a delay circuit 123, which is used to turn on the control switch 121 within a preset time after power-on. Specifically, the delay circuit 123 is a capacitor connected between the first terminal and the third terminal of the control switch 121. Under normal conditions, when the capacitor is charged for a preset time (e.g., 0.2 s) or reaches a preset voltage, the control switch 121 is turned on, and the LED light source 103 can operate.
In some embodiments, the delay circuit 123 is reset when at least one of the first detection signal and the second detection signal is low. For example, when the first detection signal is at a low level, the third switch T3 is turned on, the two ends of the capacitor 123 are short-circuited, the capacitor 123 is discharged, i.e., corresponding to a reset, when both the first detection signal and the second detection signal are at a high level, the third switch T3 is turned off, the capacitor 123 is charged, and when the capacitor is charged for a preset time (e.g., 0.2 s) or reaches a preset voltage, the control switch 121 is turned on, and the LED light source 103 can operate. The control switch can be switched on only by delaying again, so that arc discharge caused by incorrect installation of the lamp holder can be prevented.
That is, under normal conditions, when powered on or energized, the LED light source may operate normally after a preset time. Under the condition that need detect lamp holder connected state, when the circular telegram or circular telegram, electric capacity 123 can be charged, at this moment, if it does not install first end lamp holder and/or second end lamp holder, trigger module can produce protection signal so that electric capacity 123 is discharged, be equivalent to resetting, when detecting that first end lamp holder and second end lamp holder are installed, electric capacity 123 begins to charge, reach and predetermine time or predetermine the voltage after, control switch 121 switches on, the LED light source can only work.
Although the invention uses capacitors to delay the time, it will be understood by those skilled in the art that any other components may be used to delay or time.
In some embodiments, the lighting assembly 100 further comprises a rectifying module comprising a first rectifying circuit 104 connected between the LED light source 103 and the first end cap 101, and a second rectifying circuit 105 connected between the LED light source 103 and the second end cap 102 for converting alternating current to direct current for providing to the LED light source. Specifically, the first rectification circuit 130 includes a rectification bridge composed of diodes D21, D22, D23, and D24. The second rectification circuit 132 includes a rectification bridge composed of diodes D31, D32, D33, and D34.
FIG. 3 is a schematic diagram of a detection module 300 according to some embodiments of the invention. As shown in fig. 3, different from the first detection module 211 shown in fig. 2, the first detection module 300 includes, in addition to the diode D1, the diode D2 and the blocking capacitor C1, a resistor R1 connected between a connection point of the diode D1 and the diode D2 and the first capacitor C1, and an optical coupler 310 connected to two ends of the R1, wherein an output end of the optical coupler is a first detection signal a, that is, the first detection signal is taken before the blocking capacitor C1, and the detection module can measure whether the corresponding first terminal cap is connected by measuring whether an ac signal passes through the resistor R1. When the first end cap is connected, an alternating current signal passes through the resistor R1, and the corresponding first detection signal is at a pulse or high level, and when the first end cap is not connected, only a direct current signal passes through the resistor R1, and the corresponding first detection signal is at a low level. The second detection module is also the same configuration or arrangement.
Fig. 4 shows a flow chart of a protection method of a lighting assembly according to some embodiments of the present invention, as shown in fig. 4, the protection method comprising steps 410 and 420.
In step 410, the connection state of the first end cap and the second end cap is detected to output a first detection signal and a second detection signal.
Specifically, when the first end lamp holder is in a conducting state, an alternating current signal passes through a first capacitor connected with a first pin and a second pin of the first end lamp holder, the output first detection signal is a pulse or a high level, when the first end lamp holder is in a disconnecting state, no alternating current signal passes through the first capacitor, and the output first detection signal is a low level. Similarly, when the second end lamp holder is in the on state, the alternating current signal passes through the second capacitor connected with the third pin and the fourth pin of the second end lamp holder, the output second detection signal is a pulse or a high level, when the second end lamp holder is in the off state, no alternating current signal passes through the second capacitor, and the output second detection signal is a low level without a pulse.
In step 420, the LED light source is controlled to operate based on the first detection signal and the second detection signal.
Specifically, when the first detection signal and the second detection signal are both pulse or high level, the control switch connected with the LED light source is turned on to operate the LED light source, and when at least one of the first detection signal and the second detection signal is low level, the control switch is turned off to operate the LED light source.
According to the protection device and the protection method in the lighting assembly in some embodiments of the invention, whether the lamp caps at two ends are installed and in a conducting state can be conveniently detected by arranging the detection circuit, and by arranging the delay or timing circuit, the detection circuit cannot send a protection signal as long as the lamp caps at two ends are in the conducting state, and the circuit where the LED light source is located is conducted after the preset time of the delay circuit, so that the lamp tube can be turned off under the condition of wrong installation of the lamp tube, the circuit in the lamp tube is protected, the lamp cap is prevented from being pulled out, and on the other hand, the risks of electric leakage and electric shock can be prevented.
Some exemplary embodiments have been described above, however, it should be understood that various modifications may be made. For example, suitable results may be achieved if the described techniques are performed in a different order and/or if components in the described systems, architectures, devices, or circuits are combined in a different manner and/or replaced or supplemented by additional components or their equivalents. Accordingly, other embodiments are within the scope of the following claims.
Claims (16)
1. A protective device for a lighting assembly, the lighting assembly including an LED light source and first and second end caps, the protective device comprising:
the first detection module and the second detection module are respectively used for detecting the connection state of the first end lamp cap and the second end lamp cap and outputting a first detection signal and a second detection signal; and
and the driving module is connected with the LED light source and is used for controlling the LED light source to work based on the first detection signal and the second detection signal.
2. The protection device of claim 1, wherein the first termination cap includes a first pin and a second pin, and the first detection module includes a first capacitor connected to the first pin and the second pin for detecting whether an ac signal passes through the first capacitor.
3. The protection device of claim 2, wherein when no ac signal passes through the first capacitor, the first terminal cap is in an off state and the first detection signal is low, and when an ac signal passes through the first capacitor, the first terminal cap is in an on state and the first detection signal is pulsed or high.
4. The protection device of claim 1, wherein the second lamp cap comprises a third pin and a fourth pin, and the second detection module comprises a second capacitor connected to the third pin and the fourth pin for detecting whether an ac signal passes through the second capacitor.
5. The protection device of claim 4, wherein when no AC signal passes through the second capacitor, the second lamp cap is in an OFF state, the second detection signal is at a low level, and when an AC signal passes through the second capacitor, the second lamp cap is in an ON state, the second detection signal is at a pulse or a high level.
6. The protection device of claim 1, wherein the driving module comprises a control switch, and the on or off of the control switch can control the LED light source to work or not work.
7. The protection device of claim 6, wherein the driving module further comprises a trigger circuit connected to the control switch for generating a control signal based on the first detection signal and the second detection signal to control the control switch to be turned on or off.
8. The protection device of claim 7, wherein the control switch is turned on to operate the LED light source when both the first detection signal and the second detection signal are pulsed or high, and turned off to deactivate the LED light source when at least one of the first detection signal and the second detection signal is low.
9. The protection device of claim 7, wherein the trigger circuit comprises a first switch, a second switch, and a third switch, a first terminal of the first switch is configured to receive the first detection signal, a first terminal of the second switch is configured to receive the second detection signal, a first terminal of the third switch is connected to a second terminal of the first switch and a second terminal of the second switch, and a second terminal of the third switch is connected to the driving terminal of the control switch.
10. The protection device of claim 9, wherein when the first and second detection signals are both pulsed or high, the first and second switches are on, the third switch is off, and the control switch is on.
11. The protection device of claim 9, wherein at least one of the first switch and the second switch is turned off, the third switch is turned on, and the control switch is turned off when at least one of the first detection signal and the second detection signal is at a low level.
12. The protection device of claim 7, wherein the driving module further comprises a delay circuit for turning on the control switch within a preset time after power-on.
13. The protection device of claim 12, wherein the delay circuit is reset when at least one of the first detection signal and the second detection signal is low.
14. The protection device of claim 1, further comprising:
and the rectifying module is connected between the LED light source and the first end lamp cap and the second end lamp cap and is used for converting alternating current into direct current to be supplied to the LED light source.
15. A lighting assembly comprising a protective device as claimed in any one of claims 1-14.
16. A method of protecting a lighting assembly comprising an LED light source, a first end cap and a second end cap, the method comprising:
detecting the connection state of the first end lamp cap and the second end lamp cap to output a first detection signal and a second detection signal; and
and controlling the LED light source to work based on the first detection signal and the second detection signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010661221.9A CN111712013B (en) | 2020-07-10 | 2020-07-10 | Protection device for lighting assembly, lighting assembly and protection method thereof |
Applications Claiming Priority (1)
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| CN111712013B (en) | 2023-11-07 |
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