CN104540304B - Electronic replacement-type double-end straight-tube LED fluorescent lamp and safety protection circuit thereof - Google Patents
Electronic replacement-type double-end straight-tube LED fluorescent lamp and safety protection circuit thereof Download PDFInfo
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Abstract
The invention relates to an electronic replacement-type double-end straight-tube LED fluorescent lamp and a safety protection circuit thereof. The safety protection circuit comprises a fluorescent-lamp tube simulating cathode circuit connected to a first output end and a second output end of a fluorescent-lamp electronic ballast, wherein the output end of the fluorescent-lamp tube simulating cathode circuit is connected with a first anode of a bidirectional silicon controlled rectifier, and a second anode of the bidirectional silicon controlled rectifier is connected to the input end of a high-frequency rectifying and filtering circuit of the double-end straight-tube LED fluorescent lamp by a fourth capacitor and a fifth capacitor; a high-frequency triggering circuit capable being triggered and conducted under the high-frequency state of more than 10KHz is arranged between a control electrode of the bidirectional silicon controlled rectifier and the output end of the fluorescent-lamp tube simulating cathode circuit; or an open-circuit state with distributed capacitance is arranged between the control electrode of the bidirectional silicon controlled rectifier and the output end of the fluorescent-lamp tube simulating cathode circuit; and circuits at a third output end and a fourth output end of the fluorescent-lamp electronic ballast are symmetrical to circuits at the first output end and the second output end.
Description
Technical Field
The invention relates to the technical field of illumination, in particular to an electronic replacement type double-end straight tube LED fluorescent lamp and a safety protection circuit thereof.
Background
The LED fluorescent lamp tube has the advantages of high luminous efficiency and low energy consumption, gradually replaces the traditional fluorescent lamp tube, and is more and more widely applied to various occasions to achieve the purposes of high-efficiency illumination and energy conservation. The double-end replacement type LED lamp tube for directly replacing the traditional fluorescent lamp tube can realize replacement without modifying the original lamp structure at present. Please refer to patent application CN 103929858A, which discloses an LED fluorescent tube and a lighting fixture driven by an electronic ballast of a fluorescent lamp, wherein a high-frequency rectifying and filtering unit is used to match with the filament impedance of the fluorescent lamp of the electronic ballast of the fluorescent lamp, and the LED module is used to emit light, so that the lighting fixture can be adapted to the electronic ballast of the fluorescent lamp without any modification.
According to the international IEC62776-2012 and IEC62776-2014 regulatory requirements, a number of safety tests need to be performed on double-ended LED lamps used to replace traditional fluorescent lamps. It is stated therein that, when only one lamp cap is inserted into the lamp base, electricity is transferred to the other lamp cap not yet inserted, and no electric shock should be induced, the following detection method is used to verify its compliance: and (3) switching on a circuit of the lamp by rated voltage, only enabling one end of the lamp holder to be electrified, inserting the lamp cap at one end of the lamp tube into the lamp holder, and detecting that the lamp cap at the other end which is not inserted into the lamp holder does not have a conductive part to cause electric shock according to the requirements of IEC60598-1 appendix A. In addition, the requirement of IEC61347-1 appendix A is stipulated that the insulation resistance between the pin or the contact of the lamp cap and the pin or the contact of the lamp cap at the other end is not less than 2M omega. When the insulation resistance test was performed, a dc voltage of about 500V was applied in a humidified chamber. The dielectric strength test should be performed immediately after the dielectric strength test. In the dielectric strength test, the applied voltage was more than 1500V.
However, in the above prior art circuit scheme of the LED fluorescent tube, the rectifying and filtering unit connected to the LED module is directly connected to the electronic ballast of the fluorescent lamp, and there is no safety protection circuit in the middle, so that it is impossible to pass the above multiple safety tests performed on the double-ended LED lamp, and there is a great potential safety hazard.
Disclosure of Invention
The invention aims to solve the technical problem of providing an electronic replacement type double-end straight tube LED fluorescent lamp and a safety protection circuit thereof, which meet the safety regulation requirements of international IEC62776-2012 and IEC62776-2014 aiming at the defects in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an electronic replacement type double-end straight tube LED fluorescent lamp safety protection circuit is constructed, wherein the circuit comprises a fluorescent tube simulated cathode circuit connected with a first output end and a second output end of a fluorescent lamp electronic ballast; the output end of the fluorescent lamp tube simulated cathode circuit is connected with a first anode of a bidirectional thyristor, and a second anode of the bidirectional thyristor is connected to the input end of a high-frequency rectification filter circuit of the double-end straight-tube LED fluorescent lamp through a fourth capacitor and a fifth capacitor;
a high-frequency trigger circuit which is triggered and conducted under the high-frequency state of more than 10kHz is arranged between the control electrode of the bidirectional controllable silicon and the output end of the fluorescent tube simulated cathode circuit;
or, an open circuit state with distributed capacitance exists between the control electrode of the bidirectional controllable silicon and the output end of the fluorescent lamp tube simulation cathode circuit;
the circuit arrangement of the third output end and the fourth output end of the fluorescent lamp electronic ballast is symmetrical to the circuit arrangement of the first output end and the second output end.
The safety protection circuit comprises a high-frequency trigger circuit, a first capacitor and a second capacitor, wherein the capacitance value range of the first capacitor is 1P-10 muF;
or the high-frequency trigger circuit consists of a sixth capacitor and a seventh capacitor which are connected in series, and the capacitance value ranges of the sixth capacitor and the seventh capacitor are both 1P-10 muF;
or the high-frequency trigger circuit consists of an eighth capacitor and a ninth resistor which are connected in series, the capacitance range of the eighth capacitor is 1P-10 muF, and the value range of the ninth resistor is 1 omega-10 omega;
the bidirectional controllable silicon is 1-5A and the withstand voltage is more than 1 KV.
The safety protection circuit comprises a fluorescent lamp tube simulated cathode circuit, a first resistor, a second resistor, a first capacitor and a second capacitor, wherein the fluorescent lamp tube simulated cathode circuit comprises the first resistor and the second resistor which are connected in series and then connected between a first output end and a second output end of a fluorescent lamp electronic ballast; wherein,
and the connection point between the first resistor and the second resistor is the output end of the fluorescent lamp tube simulation cathode circuit.
The safety protection circuit is characterized in that the value ranges of the first resistor and the second resistor are 1-1 k omega;
the value range of the first capacitor and the second capacitor is 0.01 mu F-10 mu F;
the value range of the fourth capacitor and the fifth capacitor is 0.01-50 muF.
The safety protection circuit comprises a fluorescent tube simulation cathode circuit, a first voltage regulator circuit, a second voltage regulator circuit and a control circuit, wherein the fluorescent tube simulation cathode circuit comprises a first self-recovery fuse and a second self-recovery fuse which are connected in series and then connected between a first output end and a second output end of a fluorescent lamp electronic ballast;
the connection point between the first self-recovery fuse and the second self-recovery fuse is the output end of the fluorescent tube analog cathode circuit;
the value range of the current parameter of the first self-recovery fuse and the second self-recovery fuse is 0.25-2A.
The invention relates to a safety protection circuit, wherein the safety protection circuit also comprises an isolation circuit resistance channel for maintaining a system low current working state, and the safety protection circuit comprises:
the third resistor is connected between the first output end of the fluorescent lamp electronic ballast and the second anode of the bidirectional controllable silicon;
the fourth resistor is connected between the second output end of the fluorescent lamp electronic ballast and the second anode of the bidirectional controllable silicon;
a fifth resistor connected in parallel to both ends of the fourth capacitor; the sixth resistor is connected to two ends of the fifth capacitor in parallel;
the value ranges of the third resistor, the fourth resistor, the fifth resistor and the sixth resistor are 1M omega-10M omega.
The invention also provides an electronic replacement type double-end straight tube LED fluorescent lamp safety protection circuit, which comprises a fluorescent tube simulated cathode circuit connected with a first output end and a second output end of a fluorescent lamp electronic ballast; the output end of the fluorescent tube simulated cathode circuit is connected with a bidirectional thyristor group consisting of at least two bidirectional thyristors which are connected in series and have the same type, a first anode of the bidirectional thyristor positioned at the forefront end in the bidirectional thyristor group is connected with the output end of the fluorescent tube simulated cathode circuit, and a second anode of the bidirectional thyristor positioned at the rearmost end in the bidirectional thyristor group is connected to the input end of a high-frequency rectification filter circuit of the double-end straight tube LED fluorescent lamp through a fourth capacitor and a fifth capacitor;
the control electrode of each bidirectional controllable silicon in the bidirectional controllable silicon group is connected with a high-frequency trigger circuit which is triggered and conducted under the high-frequency state of more than 10 kHz; the control electrode of the bidirectional controllable silicon at the rear end is electrically connected with the control electrode of the bidirectional controllable silicon at the adjacent front end through the high-frequency trigger circuit, and the control electrode of the bidirectional controllable silicon at the foremost end is electrically connected with the output end of the fluorescent tube simulation cathode circuit through the high-frequency trigger circuit;
or the control electrode of each bidirectional controllable silicon in the bidirectional controllable silicon group is in an open circuit state with distributed capacitance between the control electrode and the output end of the fluorescent lamp tube simulation cathode circuit;
the circuit arrangement of the third output end and the fourth output end of the fluorescent lamp electronic ballast is symmetrical to the circuit arrangement of the first output end and the second output end.
The invention also provides an electronic replacement type double-end straight tube LED fluorescent lamp which is driven by the electronic ballast of the fluorescent lamp and comprises a high-frequency rectifying and filtering circuit connected with an LED lamp bank; the safety protection circuit is connected between the output end of the fluorescent lamp electronic ballast and the high-frequency rectifying and filtering circuit.
The invention relates to an electronic type substitution double-end straight tube LED fluorescent lamp, wherein a high-frequency rectification filter circuit comprises a first diode, a second diode, a third diode, a fourth diode and a capacitor;
wherein the first diode and the second diode are connected in series by a seventh resistor or a third self-healing fuse;
the third diode and the fourth diode are connected in series through a seventh resistor or a third self-recovery fuse;
the cathode of the first diode is connected with the cathode of the third diode, and the anode of the second diode is connected with the anode of the fourth diode;
the second anode of the bidirectional controllable silicon positioned at the rearmost end is connected to the connection point of the first diode and the seventh resistor through the fourth capacitor;
the second anode of the bidirectional triode thyristor positioned at the rearmost end is simultaneously connected to the connecting point of the second diode and the seventh resistor through the fifth capacitor;
the capacitor is connected between the cathode of the third diode and the anode of the fourth diode;
and both ends of the capacitor are connected with a piezoresistor in parallel.
The electronic replacement type double-end straight tube LED fluorescent lamp is characterized in that the high-frequency rectification filter circuit is arranged in two lamp holders of the electronic replacement type double-end straight tube LED fluorescent lamp in a first module mode;
the safety protection circuit is arranged in the two lamp caps of the electronic replacement type double-end straight tube LED fluorescent lamp in a second module mode, and the two lamp caps are symmetrical in structure;
the first module and the second module in the lamp holder at one end are electrically connected through threaded copper columns, and the threaded copper columns are connected to two ends of the seventh resistor or connected to two ends of the third self-recovery fuse.
The invention has the beneficial effects that: the bidirectional thyristor is arranged between the output end of the fluorescent lamp electronic ballast of the electronic replacement type double-end straight tube LED fluorescent lamp and the high-frequency rectifying and filtering circuit, and the control electrode of the bidirectional thyristor is connected with the high-frequency trigger circuit which is triggered and conducted under the high-frequency state of more than 10kHz, or the open circuit state with distributed capacitance is arranged between the control electrode of the bidirectional thyristor and the output end of the fluorescent lamp tube simulation cathode circuit, so that the bidirectional thyristor cannot be triggered by signals under the low frequency (power frequency 50/60Hz), and the high-frequency trigger circuit is conducted to immediately trigger the bidirectional thyristor under the high-frequency (more than 10k Hz) state, so that the high-frequency output current of the fluorescent lamp electronic ballast and the normal working channel of an LED lamp set are switched on, and the safety.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of an electronic replacement type double-end straight-tube LED fluorescent lamp safety protection circuit and related circuits according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of an electronic replacement type double-end straight-tube LED fluorescent lamp safety protection circuit and related circuits according to a preferred embodiment of the present invention;
FIG. 3 is a schematic diagram of a high frequency trigger circuit according to a preferred embodiment of the present invention;
FIG. 4 is a schematic diagram of a high frequency trigger circuit of the preferred embodiment of the present invention;
FIG. 5 is a schematic diagram of an electronic replacement type double-end straight-tube LED fluorescent lamp safety protection circuit and related circuits using a self-recovery fuse to replace a resistor according to a preferred embodiment of the invention;
FIG. 6 is a schematic diagram of an electronic replacement type double-end straight-tube LED fluorescent lamp safety protection circuit and related circuits according to another embodiment of the present invention;
FIG. 7 is a schematic diagram of the internal structure of the electronic replacement type double-end straight-tube LED fluorescent lamp cap according to the preferred embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 and 2 show an electronic replacement type double-end straight-tube LED fluorescent lamp safety protection circuit according to a preferred embodiment of the present invention, wherein for convenience of description, only the parts related to the embodiment of the present invention are shown, and the details are as follows:
the electronic replacement type double-end straight tube LED fluorescent lamp safety protection circuit comprises a fluorescent tube simulated cathode circuit connected to a first output end 1 and a second output end 2 of a fluorescent lamp electronic ballast 100; the output end of the fluorescent tube simulated cathode circuit is connected with a first anode of a bidirectional Silicon Controlled Rectifier (SCR), and a second anode of the bidirectional Silicon Controlled Rectifier (SCR) is connected to the input end of the high-frequency rectification filter circuit 300 of the double-end straight-tube LED fluorescent lamp through a fourth capacitor C4 and a fifth capacitor C5; a high-frequency trigger circuit 201 which is triggered and conducted under the high-frequency state of more than 10kHz is arranged between the control electrode of the bidirectional Silicon Controlled Rectifier (SCR) and the output end of the fluorescent tube simulated cathode circuit; or, an open circuit state with distributed capacitance exists between the control electrode of the bidirectional controllable silicon and the output end of the fluorescent lamp tube simulation cathode circuit; the circuit arrangement of the third output terminal 3 and the fourth output terminal 4 of the electronic ballast 100 of the fluorescent lamp is symmetrical to the circuit arrangement of the first output terminal 1 and the second output terminal 2.
The working principle of the protection circuit is as follows: when the frequency is low (power frequency 50/60Hz), the signal can not trigger the bidirectional Silicon Controlled Rectifier (SCR), when the frequency is high (more than 10k Hz), the high frequency trigger circuit 201 connected to the control electrode of the bidirectional Silicon Controlled Rectifier (SCR) is conducted, the conduction current is about 0.1-50mA, the bidirectional Silicon Controlled Rectifier (SCR) is triggered instantly, the current is introduced to the first anode of the bidirectional Silicon Controlled Rectifier (SCR) through the fluorescent tube simulated cathode circuit, and then is rectified and filtered to the high frequency rectification filter circuit 300 of the double-end straight tube LED fluorescent lamp through the fourth capacitor C4 and the fifth capacitor C5 respectively, and then the LED lamp group 400 is lighted, so that the high frequency output current of the fluorescent lamp electronic ballast 100 and the normal working channel of the LED lamp group 400 are switched on, and the.
In the embodiment, different from a current triggering mode in common use, the frequency triggering characteristic of the SCR is skillfully utilized, and in the process of carrying out safety standard test or installing an LED fluorescent lamp by a user, the safety protection circuit can enable the insulation resistance at two ends of a double-end LED lamp tube to be larger than 2 MOmega, and when AC1500V and 50/60Hz voltages are applied to two ends of the lamp tube, the phenomena of flicker and breakdown cannot occur; meanwhile, when a power supply of AC500V and 50/60Hz is added at one end of the device, the contact current of the other end of the device connected to the human body measuring network specified in IEC60598-1 appendix G is less than 0.7 mA.
In the above embodiment, as shown in fig. 2, an open circuit state with distributed capacitance exists between the control electrode of the triac SCR and the output end of the fluorescent lamp tube simulated cathode circuit, specifically: the control electrode of the bidirectional thyristor SCR is opened, and is not connected with any element, but due to the influence of other elements of the circuit, a circuit distributed capacitor is substantially arranged between the control electrode and the output end of the fluorescent tube simulation cathode circuit. The distributed capacitor isolates low-frequency current, so that a signal cannot trigger the bidirectional Silicon Controlled Rectifier (SCR) in a low-frequency state, and when the signal is in a high-frequency (more than 10k Hz) state, the high-frequency current immediately triggers the bidirectional Silicon Controlled Rectifier (SCR) through the distributed capacitor, so that the high-frequency output current of the fluorescent lamp electronic ballast 100 and a normal working channel of the LED lamp set 400 are connected, and the effect of safety protection is achieved.
In the above embodiment, the bidirectional thyristor SCR preferably adopts a bidirectional thyristor having a value of 1 to 5A and a withstand voltage of more than 1 KV. The triac SCR may be regarded as being composed of a PNP transistor and an NPN transistor, and therefore, a composite transistor having the same function and formed by converting transistors with the same structure should be within the protection scope of the above embodiments.
In a further embodiment, as shown in fig. 1, the fluorescent tube simulated cathode circuit includes a first resistor R1 and a second resistor R2 connected in series with each other and then connected between the first output terminal 1 and the second output terminal 2 of the fluorescent lamp electronic ballast 100, a first capacitor C1 is connected in parallel with two ends of the first resistor R1, and a second capacitor C2 is connected in parallel with two ends of the second resistor R2; the connection point between the first resistor R1 and the second resistor R2 is the output end of the fluorescent tube analog cathode circuit.
Preferably, the first resistor R1 and the second resistor R2 are resistors with the same specification, and preferably have a value ranging from 1 Ω to 1k Ω; the preferable value range of the first capacitor C1 and the second capacitor C2 is 0.01 mu F-10 mu F; the preferred value range of the fourth capacitor C4 and the fifth capacitor C5 is 0.01 μ F-50 μ F.
In a further embodiment, as shown in fig. 5, the fluorescent tube simulated cathode circuit comprises a first self-recovery fuse P1 and a second self-recovery fuse P2 connected in series with each other and then connected between a first output terminal 1 and a second output terminal 2 of the fluorescent lamp electronic ballast 100; the connection point between the first self-recovery fuse P1 and the second self-recovery fuse P2 is the output end of the fluorescent tube analog cathode circuit; the current parameters of the first self-recovery fuse P1 and the second self-recovery fuse P2 both range from 0.25A to 2A. That is, the first and second self-healing fuses P1 and P2 are used instead of the first and second resistors R1 and R2 in the previous embodiment, and it is not necessary to connect the first and second capacitors C1 and C2.
The self-restoring fuse is composed of a polymer matrix and carbon black particles for making the polymer matrix conductive, and current can pass through the self-restoring fuse due to certain conductive capacity of the material. When an overcurrent passes through the thermistor, the thermistor expands due to the heat generated, and the carbon black particles are separated and the resistance thereof increases. This will cause the thermistor to generate heat faster, expand more, and further raise the resistance. When the temperature reaches 125 ℃, the resistance changes significantly, resulting in a significant reduction in current. The small current flowing through the thermistor is sufficient to keep it at this temperature and in a high resistance state. When the fault is eliminated, the thermistor shrinks to the original shape to connect the carbon black particles again, so that the high polymer PTC thermistor is cooled quickly and returns to the original low resistance state, and the cycle operation can be realized.
In a further embodiment, as shown in fig. 1, the high frequency trigger circuit 201 includes a third capacitor C3, one end of the third capacitor C3 is connected to the output terminal of the fluorescent tube analog cathode circuit, the other end is connected to the control electrode of the triac, and the preferred range of the capacitance of the third capacitor C3 is 1P-10 μ F. When the frequency is low (power frequency 50/60Hz), the third capacitor C3 isolates the low-frequency current, the signal cannot trigger the SCR, and when the frequency is high (more than 10k Hz), the high-frequency current triggers the SCR immediately through the third capacitor C3, so that the high-frequency output current of the fluorescent lamp electronic ballast 100 and the normal working channel of the LED lamp group 400 are switched on, and the effect of safety protection is achieved.
In a further embodiment, as shown in fig. 3, the high frequency trigger circuit 201 is composed of a sixth capacitor C6 and a seventh capacitor C7 connected in series, and the capacitance of the sixth capacitor C6 and the capacitance of the seventh capacitor C7 preferably both range from 1P to 10 μ F. Similarly, at a low frequency (power frequency 50/60Hz), the series circuit formed by the sixth capacitor C6 and the seventh capacitor C7 isolates a low-frequency current, a signal cannot trigger the triac SCR, and when the lamp is in a high-frequency (greater than 10 khz) state, the high-frequency current passes through the sixth capacitor C6 and the seventh capacitor C7 to immediately trigger the triac SCR, so that the high-frequency output current of the fluorescent lamp electronic ballast 100 and the normal working channel of the LED lamp set 400 are switched on, and a safety protection effect is achieved.
In a further embodiment, as shown in fig. 4, the high frequency trigger circuit is composed of an eighth capacitor C8 and a ninth resistor R9 connected in series, the capacitance of the eighth capacitor C8 preferably ranges from 1P to 10 μ F, and the capacitance of the ninth resistor R9 preferably ranges from 1 Ω to 10 Ω. Similarly, when the frequency is low (power frequency 50/60Hz), the series circuit formed by the eighth capacitor C8 and the ninth resistor R9 isolates the low-frequency current, the signal cannot trigger the SCR, and when the frequency is in a high-frequency (more than 10k Hz) state, the high-frequency current passes through the eighth capacitor C8 and the ninth resistor R9 to form a circuit which immediately triggers the SCR, so that the high-frequency output current of the electronic ballast of the fluorescent lamp and the normal working channel of the LED lamp set are switched on, and the effect of safety protection is achieved.
It is understood that the high frequency trigger circuit 201 in the above embodiments may have other conversion forms, and only needs to isolate the current in the low frequency state and trigger the conduction in the high frequency state, which is not listed here.
In a further embodiment, the electronic replacement type double-end straight-tube LED fluorescent lamp safety protection circuit 200 further includes an isolation circuit resistor channel for maintaining a low-current working state of the system, including: a third resistor R3 connected between the first output terminal 1 of the fluorescent lamp electronic ballast 100 and the second anode of the triac SCR; a fourth resistor R4 connected between the second output terminal 2 of the electronic ballast 100 and the second anode of the triac SCR; a fifth resistor R5 connected in parallel across the fourth capacitor C4; a sixth resistor R6 connected in parallel across the fifth capacitor C5; the preferable value range of the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 is 1M omega-10M omega.
In a low-frequency state, because the triac SCR is in a cut-off state, an isolation circuit resistor channel composed of the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 with large resistance values can allow a small current of a system to flow, so that different starting characteristics of various types of electronic ballasts are considered, and a circuit safety protection effect is achieved.
As shown in fig. 6, the present invention further provides another embodiment of an electronic replacement type double-end straight-tube LED fluorescent lamp safety protection circuit, which includes a fluorescent tube analog cathode circuit connected to a first output terminal 1 and a second output terminal 2 of a fluorescent lamp electronic ballast 100; the output end of the fluorescent tube simulated cathode circuit is connected with a bidirectional thyristor group SCR ' consisting of at least two bidirectional thyristors SCR which are connected in series and have the same type, the first anode of the bidirectional thyristor positioned at the forefront end in the bidirectional thyristor group SCR ' is connected with the output end of the fluorescent tube simulated cathode circuit, and the second anode of the bidirectional thyristor positioned at the rearmost end in the bidirectional thyristor group SCR ' is connected to the input end of the high-frequency rectification filter circuit 300 of the double-end straight tube LED fluorescent lamp through a fourth capacitor C4 and a fifth capacitor C5; the control electrode of each bidirectional controllable silicon in the bidirectional controllable silicon group SCR' is connected with a high-frequency trigger circuit 201 which is triggered and conducted under the high-frequency state of more than 10 kHz; the control electrode of the bidirectional controllable silicon at the rear end is electrically connected with the control electrode of the bidirectional controllable silicon at the adjacent front end through the high-frequency trigger circuit 201, and the control electrode of the bidirectional controllable silicon at the foremost end is electrically connected with the output end of the fluorescent tube simulation cathode circuit through the high-frequency trigger circuit 201; or the control electrode of each bidirectional controllable silicon in the bidirectional controllable silicon group is in an open circuit state with distributed capacitance between the control electrode and the output end of the fluorescent lamp tube simulation cathode circuit; the circuit arrangement of the third output terminal 3 and the fourth output terminal 4 of the electronic ballast 100 of the fluorescent lamp is symmetrical to the circuit arrangement of the first output terminal 1 and the second output terminal 2.
Referring to fig. 6, the working principle of the safety protection circuit is as follows: when the frequency is low (power frequency 50/60Hz), the signal can not trigger the SCR ', when the frequency is high (more than 10k Hz), the high frequency trigger circuit 201 connected to the control electrode of the SCR' is conducted, the conduction current is about 0.1-50mA, the SCR 'is triggered instantly, the current is introduced to the first anode of the SCR' by the fluorescent tube simulated cathode circuit, and then is rectified and filtered to the high frequency rectifying and filtering circuit 300 of the double-end straight tube LED fluorescent lamp by the fourth capacitor C4 and the fifth capacitor C5 respectively, and then the LED lamp set 400 is lighted, so that the high frequency output current of the fluorescent lamp electronic ballast 100 and the normal working channel of the LED lamp set 400 are connected, and the safety protection effect is achieved.
Because more than two (for example, two, three or four) bidirectional thyristors are connected in series to form the bidirectional thyristor group SCR', the voltage resistance of the protection circuit is better. In the process of carrying out safety standard test or installing an LED fluorescent lamp by a user, the safety protection circuit can enable the insulation resistance at two ends of the double-end LED lamp tube to be larger than 2 MOmega, and when AC1500V and 50/60Hz voltages are applied to the two ends of the lamp tube, the phenomena of flicker and breakdown cannot occur; meanwhile, when a power supply of AC500V and 50/60Hz is added at one end of the device, the contact current of the other end of the device connected to the human body measuring network specified in IEC60598-1 appendix G is less than 0.7 mA.
In the safety protection circuit shown in fig. 6, a single triac SCR in the triac group SCR' is 1 to 5A and has a withstand voltage greater than 1 KV. Taking three bidirectional thyristors connected in series as an example, the three bidirectional thyristors comprise a first bidirectional thyristor and a second bidirectional thyristor which are positioned at the front end and a third bidirectional thyristor which is positioned at the rear end, wherein the second anode of the first bidirectional thyristor is connected with the first anode of the second bidirectional thyristor, and the second anode of the second bidirectional thyristor is connected with the first anode of the third bidirectional thyristor; the control electrode of the third bidirectional controllable silicon positioned at the rearmost end is connected to the control electrode of the second bidirectional controllable silicon through a high-frequency trigger circuit 201; the control electrode of the second bidirectional controllable silicon is connected to the control electrode of the first bidirectional controllable silicon through another high-frequency trigger circuit 201; the control electrode of the first bidirectional controllable silicon at the most front end is connected to the output end of the fluorescent tube analog cathode circuit through another high-frequency trigger circuit 201.
In the safety protection circuit shown in fig. 6, the high-frequency trigger circuit 201 includes a third capacitor C3, and the capacitance of the third capacitor C3 has a value ranging from 1P to 10 μ F; or, the high-frequency trigger circuit 201 is composed of a sixth capacitor C6 and a seventh capacitor C7 which are connected in series, and the capacitance value ranges of the sixth capacitor C6 and the seventh capacitor C7 are both 1P-10 muf; or, the high-frequency trigger circuit 201 is composed of an eighth capacitor C8 and a ninth resistor R9 which are connected in series, the capacitance range of the eighth capacitor C8 is 1P-10 μ F, and the capacitance range of the ninth resistor R9 is 1 Ω -10 Ω. For a detailed description of the principle of the high frequency trigger circuit 201, please refer to the foregoing embodiments, which are not described herein.
In the safety protection circuit shown in fig. 6, the principle of the fluorescent lamp tube analog cathode circuit refers to the foregoing embodiments, and the parameter values of each component refer to the foregoing embodiments, which are not described herein again.
In the electronic replacement type double-end straight tube LED fluorescent lamp safety protection circuit 200 shown in fig. 6, further, an isolation circuit resistor channel for maintaining a low current working state of the system is further included, and the principle description of the isolation circuit resistor channel is also referred to the foregoing embodiments, and is not repeated herein.
The present invention further provides an embodiment of an electronic replacement type double-end straight tube LED fluorescent lamp, as shown in fig. 7, with reference to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5 and fig. 6, which is driven by an electronic ballast 100 of a fluorescent lamp and includes a high-frequency rectifying and filtering circuit 300 connected to an LED lamp set 400; the safety protection circuit 200 as described in any of the previous embodiments is connected between the output terminal of the fluorescent lamp electronic ballast 100 and the high frequency rectifying and filtering circuit 300. The safety protection circuit 200 functions as a safety switch between the output terminal of the fluorescent lamp electronic ballast and the high-frequency rectifying and filtering circuit 300, and the safety switch is a frequency-sensitive safety switch, and is switched off in a low-frequency (power frequency 50/60Hz) state and switched on in a high-frequency (more than 10k Hz) state. The working principle of the safety protection circuit 200 is described in the foregoing embodiments, and is not described herein again.
In the electronic replacement type double-end straight tube LED fluorescent lamp of the embodiment, different from a current triggering mode in common use, the frequency triggering characteristic of the bidirectional controllable silicon SCR is skillfully utilized, and in the process of carrying out safety standard test or installing the LED fluorescent lamp by a user, the safety protection circuit can enable the insulation resistance at two ends of the double-end LED lamp tube to be larger than 2 MOmega, and when AC1500V and 50/60Hz voltages are applied to the two ends of the lamp tube, the phenomena of flicker and breakdown cannot occur; meanwhile, when a power supply of AC500V and 50/60Hz is added at one end of the device, the contact current of the other end of the device connected to the human body measuring network specified in IEC60598-1 appendix G is less than 0.7 mA.
Therefore, the electronic replacement type double-end straight tube LED fluorescent lamp provided by the invention has the advantages that electric shock accidents can not occur and the lamp tube can not be damaged in the replacement installation process and normal work, so that the personal and property safety can be ensured. Meanwhile, the double-end LED fluorescent lamp can directly replace a fluorescent lamp tube without changing the circuit of the fluorescent lamp lighting lamp driven by the original electronic ballast, thereby achieving the purposes of energy conservation, safety, environmental protection and long-life work.
In the electronic replacement type double-end straight tube LED fluorescent lamp of the above embodiment, as shown in fig. 1 and fig. 2, the live line end L and the neutral line end N of the fluorescent lamp electronic ballast 100 are connected to commercial alternating current AC (voltage is 220V, frequency is 50Hz or 60Hz), the fluorescent lamp electronic ballast 100 converts alternating current commercial power AC into high-frequency alternating current through its internal AC-DC patent circuit and DC-AC conversion circuit, and outputs the high-frequency alternating current to the safety protection circuit 200 of the present invention, and the current frequency range is 20KHz to 80 KHz.
In the above embodiment, as shown in fig. 1 and 2, the high-frequency rectifying-smoothing circuit 300 includes the first diode D1, the second diode D2, the third diode D3, and the fourth diode D4, and the capacitor Co; wherein, the first diode D1 and the second diode D2 are connected in series through a seventh resistor R7 (or a third self-recovery fuse P3, as shown in fig. 5); the third diode D3 and the fourth diode D4 are connected in series through a seventh resistor R7 '(or a third self-recovery fuse P3', as shown in fig. 5); the cathode of the first diode D1 is connected with the cathode of the third diode D3, and the anode of the second diode D2 is connected with the anode of the fourth diode D4; the second anode of the triac SCR is connected to the junction of the first diode D1 and the seventh resistor through a fourth capacitor C4; the second anode of the triac SCR is connected to the connection point of the second diode D2 and the seventh resistor through a fifth capacitor C5; the capacitor Co is connected between the cathode of the third diode D3 and the anode of the fourth diode D4.
Preferably, both ends of the LED lamp set 400 are connected in parallel with 100V-200V voltage dependent resistors, so as to prevent a user from mistakenly connecting the lamp tube to the inductive fluorescent lamp, and avoid damage to the LED lamp bead caused by the instantaneous back electromotive force when the starter (bulb skipping) is turned off.
Preferably, in the electronic replacement type double-end straight tube LED fluorescent lamp, as shown in fig. 7 and referring to fig. 1 and 2, the high-frequency rectifying and filtering circuit 300 is disposed in the two lamp caps 501 of the electronic replacement type double-end straight tube LED fluorescent lamp in the form of a first module a; the safety protection circuit 200 is arranged in two lamp caps 501 of the electronic replacement type double-end straight tube LED fluorescent lamp in a second module B mode, and the two lamp caps are symmetrical in structure; the first module A and the second module B in the lamp holder at one end are electrically connected through the threaded copper pillar 504, the threaded copper pillar 504 is connected to two ends of the seventh resistor R7, or the threaded copper pillar 504 is connected to two ends of the third self-recovery fuse P3.
In the above-described embodiment of the electronic replacement type double-end straight-tube LED fluorescent lamp, as shown in fig. 1, the LED lamp set 400 is formed by connecting a plurality of LED light-emitting units (L1-Ln) in parallel, the input ends of the plurality of LED light-emitting units (L1-Ln) are commonly connected to the output end of the high-frequency rectifying and filtering circuit 300, the output ends of the plurality of LED light-emitting units (L1-Ln) are commonly connected to the loop end of the high-frequency rectifying and filtering circuit 300, and each LED light-emitting unit is formed by connecting a plurality of LED chips in series. Wherein, the number of the plurality of LED light-emitting units (L1-Ln) ranges from 2 to 20; in each LED light-emitting unit, the number of the plurality of LED chips ranges from 10 to 50.
The total length of the glass tube 503 of the electronic replacement type double-end straight tube LED fluorescent lamp of the embodiment is preferably 1178mm or 1478mm, and the length of the light bar 502 is preferably 1170mm or 1466 mm; the lamp cap 501 is lengthened by 6mm to avoid exposing wires or dark areas at the lamp cap.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (10)
1. An electronic replacement type double-end straight tube LED fluorescent lamp safety protection circuit is characterized by comprising a fluorescent tube simulated cathode circuit connected to a first output end (1) and a second output end (2) of a fluorescent lamp electronic ballast (100); the output end of the fluorescent tube simulated cathode circuit is connected with a first anode of a bidirectional Silicon Controlled Rectifier (SCR), and a second anode of the bidirectional Silicon Controlled Rectifier (SCR) is connected to the input end of a high-frequency rectification filter circuit (300) of the double-end straight-tube LED fluorescent lamp through a fourth capacitor (C4) and a fifth capacitor (C5);
a high-frequency trigger circuit (201) which is triggered and conducted under the high-frequency state of more than 10kHz is arranged between the control electrode of the bidirectional Silicon Controlled Rectifier (SCR) and the output end of the fluorescent tube simulated cathode circuit;
or, an open circuit state with distributed capacitance exists between the control electrode of the bidirectional Silicon Controlled Rectifier (SCR) and the output end of the fluorescent lamp tube simulation cathode circuit;
the circuit arrangement of the third output end (3) and the fourth output end (4) of the fluorescent lamp electronic ballast (100) is symmetrical to the circuit arrangement of the first output end (1) and the second output end (2).
2. The safety protection circuit according to claim 1, wherein the high frequency trigger circuit (201) comprises a third capacitor (C3), and the capacitance of the third capacitor (C3) ranges from 1P to 10 μ F;
or the high-frequency trigger circuit (201) is composed of a sixth capacitor (C6) and a seventh capacitor (C7) which are connected in series, and the capacitance value ranges of the sixth capacitor (C6) and the seventh capacitor (C7) are both 1P-10 muF;
or the high-frequency trigger circuit (201) consists of an eighth capacitor (C8) and a ninth resistor (R9) which are connected in series, the capacitance range of the eighth capacitor (C8) is 1P-10 muF, and the value range of the ninth resistor (R9) is 1 omega-10 omega;
the bidirectional Silicon Controlled Rectifier (SCR) is 1-5A and the withstand voltage is more than 1 KV.
3. The safety protection circuit according to claim 1, wherein said fluorescent tube simulated cathode circuit comprises a first resistor (R1) and a second resistor (R2) connected in series with each other and then connected between said first output terminal (1) and said second output terminal (2) of the fluorescent lamp electronic ballast (100), a first capacitor (C1) is connected in parallel with both ends of said first resistor (R1), and a second capacitor (C2) is connected in parallel with both ends of said second resistor (R2); wherein,
the connection point between the first resistor (R1) and the second resistor (R2) is the output end of the fluorescent tube analog cathode circuit.
4. The safety protection circuit according to claim 3, wherein the first resistor (R1) and the second resistor (R2) have values in the range of 1 Ω -1k Ω;
the first capacitor (C1) and the second capacitor (C2) have the value range of 0.01-10 muF;
the value range of the fourth capacitor (C4) and the value range of the fifth capacitor (C5) are 0.01-50 muF.
5. The safety protection circuit according to claim 1, wherein said fluorescent tube simulated cathode circuit comprises a first self-recovery fuse (P1) and a second self-recovery fuse (P2) connected in series with each other between said first output terminal (1) and said second output terminal (2) of the fluorescent lamp electronic ballast;
the connection point between the first self-recovery fuse (P1) and the second self-recovery fuse (P2) is the output end of the fluorescent tube analog cathode circuit;
the current parameter ranges of the first self-recovery fuse (P1) and the second self-recovery fuse (P2) are both 0.25-2A.
6. The safety protection circuit according to claim 1, wherein the safety protection circuit (200) further comprises an isolated circuit resistive path for maintaining a low current operating state of the system, comprising:
a third resistor (R3) connected between the first output terminal (1) of the fluorescent lamp electronic ballast (100) and the second anode of the bidirectional thyristor (SCR);
a fourth resistor (R4) connected between the second output terminal (2) of the fluorescent lamp electronic ballast (100) and the second anode of the bidirectional thyristor (SCR);
a fifth resistor (R5) connected in parallel across the fourth capacitor (C4); and a sixth resistor (R6) connected in parallel across the fifth capacitor (C5);
the value ranges of the third resistor (R3), the fourth resistor (R4), the fifth resistor (R5) and the sixth resistor (R6) are 1M omega-10M omega.
7. An electronic replacement type double-end straight tube LED fluorescent lamp safety protection circuit is characterized by comprising a fluorescent tube simulated cathode circuit connected to a first output end (1) and a second output end (2) of a fluorescent lamp electronic ballast (100); the output end of the fluorescent tube simulated cathode circuit is connected with a bidirectional thyristor group (SCR ') consisting of at least two bidirectional thyristors (SCR) which are connected in series and have the same type, a first anode of the bidirectional thyristor positioned at the foremost end in the bidirectional thyristor group (SCR ') is connected with the output end of the fluorescent tube simulated cathode circuit, and a second anode of the bidirectional thyristor positioned at the rearmost end in the bidirectional thyristor group (SCR ') is connected to the input end of the high-frequency rectification filter circuit (300) of the double-end straight tube LED fluorescent lamp through a fourth capacitor (C4) and a fifth capacitor (C5);
the control electrode of each bidirectional controllable silicon in the bidirectional controllable silicon group (SCR') is connected with a high-frequency trigger circuit (201) which is triggered and conducted under the high-frequency state of more than 10 kHz; the control electrode of the bidirectional controllable silicon at the rear end is electrically connected with the control electrode of the bidirectional controllable silicon at the adjacent front end through the high-frequency trigger circuit (201), and the control electrode of the bidirectional controllable silicon at the foremost end is electrically connected with the output end of the fluorescent tube simulated cathode circuit through the high-frequency trigger circuit (201);
or, the control electrode of each bidirectional controllable silicon in the bidirectional controllable silicon group (SCR') is in an open circuit state with distributed capacitance between the control electrode and the output end of the fluorescent tube simulation cathode circuit;
the circuit arrangement of the third output end (3) and the fourth output end (4) of the fluorescent lamp electronic ballast (100) is symmetrical to the circuit arrangement of the first output end (1) and the second output end (2).
8. An electronic replacement type double-end straight tube LED fluorescent lamp is driven by a fluorescent lamp electronic ballast (100) and comprises a high-frequency rectifying and filtering circuit (300) connected with an LED lamp set (400); the fluorescent lamp electronic ballast (100) is characterized in that a safety protection circuit (200) according to any one of claims 1-7 is connected between the output end of the fluorescent lamp electronic ballast (100) and the high-frequency rectifying and filtering circuit (300).
9. The electronic replacement double-ended straight tube LED fluorescent lamp according to claim 8, wherein the high frequency rectifying and filtering circuit (300) comprises a first diode (D1), a second diode (D2), a third diode (D3) and a fourth diode (D4) and a capacitor (Co);
wherein the first diode (D1) and the second diode (D2) are connected in series by a seventh resistor (R7) or a third self-recovery fuse (P3);
the third diode (D3) and the fourth diode (D4) are connected in series through a seventh resistor (R7 ') or a third self-recovery fuse (P3');
the cathode of the first diode (D1) is connected with the cathode of the third diode (D3), and the anode of the second diode (D2) is connected with the anode of the fourth diode (D4);
a second anode of a last triac (SCR) is connected to a connection point of the first diode (D1) and the seventh resistor (R7) through the fourth capacitor (C4);
a second anode of a last bidirectional controlled Silicon (SCR) is connected to a connection point of the second diode (D2) and the seventh resistor (R7) through the fifth capacitor (C5);
the capacitor (Co) is connected between the cathode of the third diode (D3) and the anode of the fourth diode (D4);
and both ends of the capacitor (Co) are connected with a piezoresistor (R8) in parallel.
10. The electronic replacement type double-end straight tube LED fluorescent lamp as claimed in claim 9, wherein the high-frequency rectifying and filtering circuit (300) is arranged in two lamp caps (501) of the electronic replacement type double-end straight tube LED fluorescent lamp in a first module (A) manner;
the safety protection circuit (200) is arranged in the two lamp caps (501) of the electronic replacement type double-end straight tube LED fluorescent lamp in the form of a second module (B), and the two lamp caps (501) are symmetrical in structure;
the first module (A) and the second module (B) in the lamp cap (501) at one end are electrically connected through a threaded copper column (504), the threaded copper column (504) is connected to two ends of the seventh resistor (R7), or the threaded copper column (504) is connected to two ends of the third self-recovery fuse (P3).
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| CN201510023550.XA CN104540304B (en) | 2015-01-16 | 2015-01-16 | Electronic replacement-type double-end straight-tube LED fluorescent lamp and safety protection circuit thereof |
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| CN201510023550.XA CN104540304B (en) | 2015-01-16 | 2015-01-16 | Electronic replacement-type double-end straight-tube LED fluorescent lamp and safety protection circuit thereof |
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| WO2016112538A1 (en) * | 2015-01-16 | 2016-07-21 | 邓树兴 | Electronic substitution-type double-end straight-tube led lamp and safety protection circuit thereof |
| CN106304522A (en) * | 2015-05-22 | 2017-01-04 | 讯强电子(惠州)有限公司 | General-purpose type light-emitting diode lamp tube, power-supply system and LED driving circuit |
| CN106413213A (en) * | 2015-08-03 | 2017-02-15 | 常州明石晶电科技有限公司 | Starting system used for LED lighting device and the LED lighting device |
| CN106102290B (en) * | 2016-08-02 | 2019-04-23 | 欧普照明股份有限公司 | A kind of device and illuminator based on electronic ballast control electronic control circuit |
| EP3566546B1 (en) * | 2017-01-03 | 2020-08-05 | Signify Holding B.V. | A retrofit light emitting diode, led, tube for replacing a fluorescent tube |
| CN107529713B (en) * | 2017-07-27 | 2024-02-02 | 邓树兴 | Universal LED lamp tube and module thereof |
| WO2019019080A1 (en) * | 2017-07-27 | 2019-01-31 | 邓树兴 | A universal led lamp bulb and module |
| CN107734779A (en) * | 2017-11-13 | 2018-02-23 | 广州格比瑞科技有限公司 | Two-terminal electronic compatible type LED lamp tube drives module |
| US10674586B1 (en) | 2019-10-22 | 2020-06-02 | Jiangxi Jingke Electronics Co., Ltd. | Universal LED tube and module thereof |
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| CN201781665U (en) * | 2010-08-17 | 2011-03-30 | 广德利德照明有限公司 | LED lamp tube protective circuit structure |
| KR101040833B1 (en) * | 2011-04-05 | 2011-06-14 | 김성윤 | Ballast circuit for led lamp |
| CN103841697B (en) * | 2012-11-23 | 2017-04-05 | 罗正华 | The IC chip and its control circuit of electric ballast direct drive LED |
| CN103929858B (en) * | 2014-04-15 | 2015-11-25 | 刘坚 | The LED fluorescent lamp tube utilizing electronic ballast for fluoresent lamp to drive and lighting |
| CN204350393U (en) * | 2015-01-16 | 2015-05-20 | 邓树兴 | Electronic type substituted type double end and straight tube LED daylight lamp and safety protective circuit thereof |
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Effective date of registration: 20170407 Address after: 516200 Huiyang Economic Development Zone, the village of Wai Wai Wai Patentee after: Huizhou yameiya Electronic Technology Co.,Ltd. Address before: 518000 Luohu District, Shenzhen, Liantang, Hong Kong, lotus road, No. 715, building 6, building, building 59 Patentee before: Deng Shuxing Patentee before: Liu Jian |
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