CN109587878B - A + B type LED fluorescent lamp circuit with double-end input - Google Patents
A + B type LED fluorescent lamp circuit with double-end input Download PDFInfo
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- CN109587878B CN109587878B CN201811453480.1A CN201811453480A CN109587878B CN 109587878 B CN109587878 B CN 109587878B CN 201811453480 A CN201811453480 A CN 201811453480A CN 109587878 B CN109587878 B CN 109587878B
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- 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]
- H05B45/10—Controlling the intensity of the light
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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]
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Abstract
The invention discloses a double-end input A + B type LED fluorescent lamp circuit, which comprises a first rectifying circuit, a second rectifying circuit, an EMI circuit, an LED light-emitting circuit, a filter circuit, a B type anti-electric shock circuit, a voltage trigger circuit, a voltage-boosting and voltage-reducing constant current circuit, a high-frequency conduction circuit and a controllable rectifying circuit, wherein the first rectifying circuit is connected with the second rectifying circuit; the LED fluorescent lamp has the advantages that on the basis of low cost, high working voltage can be provided for the LED light-emitting circuit, and the maximum power can meet the requirements of users no matter the LED fluorescent lamp is used as an A-type LED fluorescent lamp circuit or a B-type LED fluorescent lamp circuit.
Description
Technical Field
The invention relates to an LED fluorescent lamp circuit, in particular to an A + B type LED fluorescent lamp circuit with double-end input.
Background
The conventional fluorescent lamp generally includes a lamp holder and a fluorescent lamp tube, the appearance of the fluorescent lamp tube is shown in fig. 1, the conventional fluorescent lamp tube is generally of a tube type structure and includes a tube body and a fluorescent lamp circuit located inside, two ends of the tube body are respectively provided with two connection pins (P1 and P2, P3 and P4), and when the fluorescent lamp tube is mounted on the lamp holder, the connection pins P1, P2, P3 and P4 connect the fluorescent lamp circuit inside the tube body with an external circuit (mains supply or ballast).
In recent years, LED fluorescent lamps with the advantages of environmental protection and energy conservation are more and more widely applied. The LED fluorescent lamp comprises a lamp holder and an LED fluorescent lamp tube, and although the LED fluorescent lamp tube has a similar appearance with the traditional fluorescent lamp tube, the circuits of the LED fluorescent lamp tube and the traditional fluorescent lamp tube have different light-emitting principles. For the LED fluorescent lamp with double-end input, the LED fluorescent lamp circuit in the lamp tube is electrically connected. When the LED fluorescent tube is installed, generally, the connecting pin at one end of the LED fluorescent tube is inserted into a socket for installing the LED fluorescent tube, which is arranged at one end of the lamp holder, and then the connecting pin at the other end of the LED fluorescent tube is inserted into a socket for installing the LED fluorescent tube, which is arranged at the other end of the lamp holder. In the installation process, when the power switch connected with the lamp holder is in an on state, if an installer accidentally touches the connecting pin at the other end of the LED fluorescent lamp tube when inserting the connecting pin at one end of the LED fluorescent lamp tube, a conductive loop is formed among the power supply, a human body and the LED fluorescent lamp tube, and the installer is easily shocked by electricity to cause personal injury.
In order to ensure the personal safety of installation personnel and avoid electric shock accidents in the installation process, the north american countries require that the LED fluorescent lamp has an electric shock prevention function when being installed. Currently, the means for solving the above problems is to set an anti-electric shock circuit in the LED fluorescent lamp circuit, and the LED fluorescent lamp determines whether the LED fluorescent lamp is normally connected to the lamp holder according to an electric indicator when the LED fluorescent lamp is connected to the lamp holder, so as to determine whether to switch on the anti-electric shock circuit according to the determination result. When only one end of the LED fluorescent tube is connected with the lamp holder through the connecting pin, the anti-electric shock circuit is not conducted and is in a high-resistance state, even if one end of the LED fluorescent tube is electrified, the anti-electric shock circuit disconnects one end of the LED fluorescent tube from the other end of the LED fluorescent tube, and at the moment, if an installer contacts the connecting pin at the other end of the LED fluorescent tube, an electric shock phenomenon cannot be generated. When the LED fluorescent lamp tube is normally connected to the lamp holder, the anti-electric shock circuit is conducted, and the LED fluorescent lamp tube can normally emit light at the moment.
In the LED fluorescent lamp industry, an LED fluorescent lamp capable of being matched with a ballast is called an a-class LED fluorescent lamp, and because of the constraint of the existing lamp holder, a lamp tube of the a-class LED fluorescent lamp has a double-end input, that is, a voltage output by the ballast is input into an LED fluorescent lamp circuit from both ends of the LED fluorescent lamp tube. LED fluorescent lamps that can be operated directly to the mains without a ballast are known as class B LED fluorescent lamps. When the class B LED fluorescent lamp is input at a single end, a live wire and a zero line of commercial power are only connected to two connecting pins at one end of the class B LED fluorescent lamp, and two connecting pins at the other end of the class B LED fluorescent lamp are not connected with an external circuit; when the B-type LED fluorescent lamp is input from two ends, the live wire and the zero wire of the commercial power are respectively connected to any connecting pin at two ends of the B-type LED fluorescent lamp.
The LED fluorescent lamp can be compatible with commercial power and a ballast at the same time, has the using functions of an A-type LED fluorescent lamp and a B-type LED fluorescent lamp, and is called an A + B-type LED fluorescent lamp by selecting a proper working mode according to the actual condition of connection. The circuit diagram of the existing A + B type LED fluorescent lamp circuit with double input ends is shown in figure 2, and the A + B type LED fluorescent lamp circuit with double input ends comprises a first rectifying current, a second rectifying circuit, an EMI circuit, a voltage-reducing constant-current circuit, a B type anti-electric-shock circuit, a filter circuit, an LED light-emitting circuit, a voltage trigger circuit and an electronic switch circuit. The first rectifying circuit and the second rectifying circuit are both realized by adopting a high-frequency full-bridge rectifying circuit and are respectively provided with a live wire input end, a zero line input end, an output end and a grounding end; the EMI circuit is used for eliminating the interference of high-frequency signals generated by the switching power supply to a power grid and is provided with an input end, an output end and a grounding end; the LED light-emitting circuit and the filter circuit are respectively provided with a positive electrode and a negative electrode; the class B anti-electric shock circuit is provided with a detection end, an output end and a grounding end, when the LED fluorescent lamp tube is not connected into the lamp holder, the output end and the grounding end of the class B anti-electric shock circuit are in a high-impedance state, when the LED fluorescent lamp tube is normally connected into the lamp holder, if a signal of the detection end of the class B anti-electric shock circuit is a low-frequency voltage of commercial power, the output end and the grounding end are in a conducting state, and when the voltage of the detection end of the class B anti-electric shock circuit is a high-frequency input voltage signal, the output end and the grounding end are always in the high-impedance state; the voltage trigger circuit is provided with an anode and a cathode, a voltage trigger threshold is arranged in the voltage trigger circuit, when the voltages at the two ends of the anode and the cathode exceed the voltage trigger threshold, the anode and the cathode are conducted, when the voltages at the two ends of the anode and the cathode are smaller than the voltage trigger threshold, the anode and the cathode return to a high-resistance state, and the voltage trigger circuit is a normally-open device; the electronic switch circuit is provided with a detection end, an output end and a grounding end, and when the detection end of the electronic switch circuit has high-frequency voltage input, the output end and the grounding end of the electronic switch circuit are conducted; the voltage reduction constant current circuit is provided with an input end, an output end and a grounding end and is used for converting the voltage input into the voltage into direct current with constant magnitude and outputting the direct current; the live wire input end of the first rectifying circuit is used for being connected with a connecting pin P1 at one end of the LED fluorescent lamp tube, and the zero wire input end of the first rectifying circuit is used for being connected with a connecting pin P2 at one end of the LED fluorescent lamp tube; the live wire input end of the second rectifying circuit is connected with the detection end of the electronic switch circuit, the connection end of the second rectifying circuit is used for being connected with a connection pin P4 at the other end of the LED fluorescent lamp tube, and the zero line input end of the second rectifying circuit is used for being connected with a connection pin P3 at the other end of the LED fluorescent lamp tube; the output end of the first rectifying circuit, the output end of the second rectifying circuit and the input end of the EMI circuit are connected with the detection end of the B-type anti-electric shock circuit; the output end of the EMI circuit, the input end of the voltage reduction constant current circuit, the anode of the filter circuit and the anode of the LED light-emitting circuit are connected, and the output end of the voltage reduction constant current circuit, the cathode of the filter circuit, the cathode of the LED light-emitting circuit and the anode of the voltage trigger circuit are connected; the grounding end of the voltage-reducing constant-current circuit and the grounding end of the EMI are connected with the output end of the B-type electric shock preventing circuit; the negative electrode of the voltage trigger circuit is connected with the output end of the electronic switch circuit; the grounding end of the first rectifying circuit, the grounding end of the second rectifying circuit, the grounding end of the B-type electric shock preventing circuit and the grounding end of the electronic switch circuit are connected together.
When the A + B type LED fluorescent lamp circuit with double-end input is used as a B type LED fluorescent lamp circuit, no matter the A + B type LED fluorescent lamp circuit is in single-end input or double-end input, direct current voltage is output at the connection position of the output end of the first rectifying circuit and the output end of the second rectifying circuit, after the B type anti-electric shock circuit judges that the A + B type LED fluorescent lamp circuit belongs to a state of normally connecting commercial power, the output end and the grounding end of the A + B type LED fluorescent lamp circuit are conducted, commercial power alternating current voltage passes through the direct current voltage output by the first rectifying circuit and the second rectifying circuit and supplies power to the voltage reduction constant current circuit after passing through the EMI circuit, the voltage reduction constant current circuit converts the direct current voltage input into high-frequency pulse current with constant size, the high-frequency pulse current is converted into smooth voltage through the filter circuit and supplies. Because the signal at the detection end of the electronic switch circuit is not a high-frequency voltage signal, the output end and the grounding end of the electronic switch circuit are in a high-impedance state, and meanwhile, the voltage trigger circuit cannot be conducted because the voltages at the two ends of the anode and the cathode of the voltage trigger circuit are lower, so that the voltage trigger circuit and the electronic switch circuit do not influence the normal work of the B-type LED fluorescent lamp circuit.
When the A + B type LED fluorescent lamp circuit with double-end input is used as an A type fluorescent lamp circuit, the output voltage of the electronic ballast is loaded at the two ends of the LED fluorescent lamp tube for input, the detection end of the electronic switch circuit is conducted with the output end and the grounding end under the action of the high-frequency voltage of the electronic ballast, the B type anti-electric shock circuit keeps a high-impedance state when the high-frequency voltage is input, at the moment, the direct-current voltage output by the output ends of the first rectifying circuit and the second rectifying circuit is loaded to the two ends of the voltage trigger circuit through the EMI circuit and the LED light-emitting circuit, when the voltage at the two ends of the voltage trigger circuit exceeds a voltage trigger threshold value, the output end and the grounding end of the voltage trigger circuit are conducted, after the voltage trigger circuit is conducted, the electronic ballast is changed from a high-voltage output state to a constant-current output state, at the moment, the high-frequency constant, then flows through the EMI circuit, passes through the filter circuit, and is loaded to the anode and the cathode of the LED light-emitting circuit, so that the LED light-emitting circuit emits light.
In the existing A + B type LED fluorescent lamp circuit with double-end input, a voltage reduction constant current circuit adopts the working mode of a common non-isolated voltage reduction switch power supply. When the fluorescent lamp is used as a B-type LED fluorescent lamp, the maximum voltage of an LED light-emitting circuit can only be controlled to be about 60V in order to meet the current harmonic requirement when the voltage is input at 120V. When the voltage of the LED light-emitting circuit is applied as an A-type LED fluorescent lamp, the electronic ballast is a constant-current output device, and the requirement of users on the light-emitting brightness cannot be met. In general, when the fluorescent lamp is used as a class-A LED fluorescent lamp, the LED light-emitting circuit with the highest voltage of about 100V is required to meet the requirements of customers.
Disclosure of Invention
The invention aims to solve the technical problem of providing a circuit of the A + B type LED fluorescent lamp with double-end input, which has an electric shock prevention function when being installed and can meet the requirement of a user on the maximum power whether being used as an A type fluorescent lamp or a B type LED fluorescent lamp.
The technical scheme adopted by the invention for solving the technical problems is as follows: a kind of A + B type LED daylight lamp circuit of double-end input, including the first rectifier circuit, the second rectifier circuit, EMI circuit, LED luminescent circuit, filter circuit, B type prevent electric shock circuit and voltage trigger circuit, said first rectifier circuit and said second rectifier circuit have live wire input end, zero line input end, output end and earthing terminal respectively, said EMI circuit has input end, output end and earthing terminal, said LED luminescent circuit, said filter circuit and said voltage trigger circuit have positive pole and negative pole respectively, said B type prevent electric shock circuit have detection end, output end and earthing terminal, said output end of the first rectifier circuit, said output end of the second rectifier circuit, said detection end of B type prevent electric shock circuit and said input end of EMI circuit connect, said earthing terminal of EMI circuit and said output end of B type prevent electric shock circuit connect, the grounding end of the first rectifying circuit, the grounding end of the second rectifying circuit and the grounding end of the B-type anti-shock circuit are connected, the A + B-type LED fluorescent lamp circuit with double-end input further comprises a buck-boost constant-current circuit, a high-frequency conduction circuit and a controllable rectifying circuit, the high-frequency conduction circuit is provided with an input end and an output end, the buck-boost constant-current circuit is provided with an input end, a grounding end, a positive output end and a negative output end, the controllable rectifying circuit is provided with a first input end, a second input end, a positive output end, a negative output end, a positive control end and a negative control end, the input end of the high-frequency conduction circuit is connected with the live wire input end of the first rectifying circuit, the first input end of the controllable rectifying circuit is connected with the live wire input end of the second rectifying circuit, and the output end of the EMI circuit is connected with the input end of the buck-, the ground terminal of the buck-boost constant current circuit is connected with the output terminal of the B-type anti-electric-shock circuit, the positive output terminal of the buck-boost constant current circuit, the output terminal of the controllable rectifying circuit and the positive electrode of the filter circuit are connected with the positive electrode of the LED light-emitting circuit, the negative output terminal of the buck-boost constant current circuit, the negative output terminal of the controllable rectifying circuit and the negative electrode of the filter circuit are connected with the negative electrode of the LED light-emitting circuit, the second input terminal of the controllable rectifying circuit is connected with the output terminal of the high-frequency conduction circuit, the positive control terminal of the controllable rectifying circuit is connected with the positive electrode of the voltage trigger circuit, and the negative control terminal of the controllable rectifying circuit is connected with the negative electrode of the voltage trigger circuit.
The buck-boost constant current circuit comprises a first capacitor, a second capacitor, a first diode, a second diode, a first resistor, a second resistor, a third resistor, a first inductor and a first integrated circuit chip, wherein the model of the first integrated circuit chip is MT7845, the first diode and the second diode are both high-frequency rectifier diodes, the 5 th pin and the 6 th pin of the first integrated circuit chip are connected, the connecting end of the first integrated circuit chip is the input end of the buck-boost constant current circuit, the anode of the first diode is the negative output end of the buck-boost constant current circuit, the cathode of the second diode is the positive output end of the buck-boost constant current circuit, the cathode of the first diode, one end of the third resistor and the 4 th pin of the first integrated circuit chip are connected, the 1 st pin of the first integrated circuit chip is connected with one end of the first capacitor, the 2 nd pin of the first integrated circuit chip, one end of the first resistor and one end of the second resistor are connected, the 3 rd pin of the first integrated circuit chip and one end of the second capacitor are connected, the other end of the first capacitor, the other end of the first resistor, the other end of the second capacitor, the other end of the third resistor, one end of the first inductor and the 7 th pin of the first integrated circuit chip are connected, the other end of the second resistor, the other end of the first inductor and the anode of the second diode are connected, and the connecting end of the second resistor, the other end of the first inductor and the anode of the second diode is the grounding end of the buck-boost constant current circuit. The circuit has the advantages of simple structure and low cost on the basis of ensuring higher output power.
The controllable rectifying circuit comprises a third diode, a fourth diode, a fifth diode, a sixth diode, a seventh diode and an eighth diode, wherein the third diode, the fourth diode, the fifth diode, the sixth diode, the seventh diode and the eighth diode are all high-frequency rectifying diodes, the cathode of the third diode is connected with the anode of the fourth diode, the connecting end of the third diode is the second input end of the controllable rectifying circuit, the anode of the seventh diode is connected with the cathode of the eighth diode, the connecting end of the seventh diode is the first input end of the controllable rectifying circuit, the cathode of the fourth diode is connected with the cathode of the sixth diode, the connecting end of the fourth diode is the positive output end of the controllable rectifying circuit, the anode of the third diode is connected with the anode of the fifth diode, and the connecting end of the third diode is the controllable electrical rectifying circuit And the negative electrode of the fifth diode is connected with the negative electrode of the seventh diode, the connecting end of the fifth diode is the positive control end of the controllable rectifying circuit, the positive electrode of the sixth diode is connected with the positive electrode of the eighth diode, and the connecting end of the sixth diode is the negative control end of the controllable rectifying circuit. The circuit rectifies high-frequency alternating-current voltage input into the circuit through the cooperation of the third diode, the fourth diode, the fifth diode, the sixth diode, the seventh diode and the eighth diode and can conduct and break control on the output of the high-frequency alternating-current voltage, the circuit is easy to cooperate with a voltage trigger circuit, and the cost is low.
The high-frequency conducting circuit comprises a third capacitor, one end of the third capacitor is an input end of the high-frequency conducting circuit, and the other end of the third capacitor is an output end of the high-frequency conducting circuit. The circuit utilizes the characteristic that the capacitor presents high impedance to low frequency, realizes the purpose of isolating low-frequency commercial power by the least components, and has simple structure and lower cost on the basis of realizing the functions.
The B-class electric shock preventing circuit comprises a ninth diode, a fourth resistor, a fifth resistor, a sixth resistor, a fourth capacitor, a fifth capacitor and a second integrated circuit chip, the model of the second integrated circuit chip is DL002, the ninth diode is a rectifier diode, the anode of the ninth diode is the detection end of the B-class electric shock preventing circuit, the cathode of the ninth diode is connected with one end of the fourth resistor, the other end of the fourth resistor, one end of the fourth capacitor and the 8 th pin of the second integrated circuit chip are connected, one end of the fifth resistor, one end of the sixth resistor and the 5 th pin of the second integrated circuit chip are connected, one end of the fifth capacitor is connected with the 6 th pin of the second integrated circuit chip, the 3 rd pin and the 4 th pin of the second integrated circuit chip are connected, and the connection end of the fifth capacitor is the output end of the B-class electric shock preventing circuit chip The other end of the fifth resistor, the other end of the sixth resistor, the other end of the fourth capacitor, the other end of the fifth capacitor and the No. 2 pin of the second integrated circuit chip are connected, and the connecting end of the fifth resistor, the sixth resistor, the fourth capacitor and the No. 2 pin of the second integrated circuit chip is the grounding end of the B-type electric shock preventing circuit.
The voltage trigger circuit comprises a seventh resistor, an eighth resistor and a twelfth diode, wherein the twelfth diode is a discharge diode, one end of the twelfth diode is connected with one end of the seventh resistor, the connecting end of the twelfth diode is the anode of the voltage trigger circuit, the other end of the seventh resistor is connected with one end of the eighth resistor, the other end of the eighth resistor is connected with the other end of the twelfth diode, and the connecting end of the eighth resistor is the cathode of the voltage trigger circuit. In the circuit, the setting of the voltage trigger threshold is realized through the setting of the tenth diode, and the twelfth diode is used as the switch of the voltage trigger circuit, so that the structure is simple, and the cost is low.
The EMI circuit comprises a second inductor, a ninth resistor, a sixth capacitor and a seventh capacitor, wherein one end of the second inductor, one end of the ninth resistor and one end of the sixth capacitor are connected, the connection end of the second inductor and the ninth resistor is the input end of the EMI circuit, the other end of the second inductor and the ninth resistor are connected with one end of the seventh capacitor, the connection end of the second inductor and the ninth resistor is the output end of the EMI circuit, the other end of the sixth capacitor is connected with the other end of the seventh capacitor, and the connection end of the sixth capacitor is the grounding end of the EMI circuit.
The filter circuit comprises an eighth capacitor and a tenth resistor, the eighth capacitor is an electrolytic capacitor, the anode of the eighth capacitor is connected with one end of the tenth resistor, the connecting end of the eighth capacitor is the anode of the filter circuit, the cathode of the eighth capacitor is connected with the other end of the tenth resistor, and the connecting end of the eighth capacitor is the cathode of the filter circuit.
The first rectifying circuit comprises an eleventh diode, a twelfth diode, a thirteenth diode and a fourteenth diode, the eleventh diode, the twelfth diode, the thirteenth diode and the fourteenth diode are all high frequency rectifier diodes, the anode of the eleventh diode is connected with the cathode of the twelfth diode, and the connection end of the eleventh diode is the live wire input end of the first rectifying circuit, the cathode of the thirteenth diode is connected with the anode of the fourteenth diode, and the connecting end of the thirteenth diode is the zero line input end of the first rectifying circuit, the cathode of the eleventh diode is connected with the cathode of the fourteenth diode, and the connection end of the eleventh diode is the output end of the first rectifying circuit, the anode of the twelfth diode is connected with the anode of the thirteenth diode, and the connecting end of the twelfth diode is the grounding end of the first rectifying circuit; the second rectifying circuit comprises a fifteenth diode, a sixteenth diode, a seventeenth diode and an eighteenth diode, the fifteenth diode, the sixteenth diode, the seventeenth diode and the eighteenth diode are all high-frequency rectifier diodes, the anode of the fifteenth diode is connected with the cathode of the sixteenth diode, and the connection end of the fifteenth diode is the live wire input end of the second rectifying circuit, the cathode of the seventeenth diode is connected with the anode of the eighteenth diode, the connecting end of the seventeenth diode is the zero line input end of the second rectifying circuit, the cathode of the fifteenth diode is connected with the cathode of the eighteenth diode, and the connection end of the fifteenth diode is the output end of the second rectifying circuit, the anode of the sixteenth diode is connected with the anode of the seventeenth diode, and the connection end of the sixteenth diode is the grounding end of the second rectifying circuit.
The LED light-emitting circuit comprises at least one LED light-emitting unit, each LED light-emitting unit comprises n LED lamp beads, n is an integer larger than or equal to 2, the negative pole of the mth lamp bead is connected with the positive pole of the (m + 1) th lamp bead, m is 1,2, …, n-1, the 1 st positive pole of the lamp bead is the positive pole of the LED light-emitting unit, the negative pole of the nth lamp bead is the negative pole of the LED light-emitting unit, the positive poles of all the LED light-emitting units are connected, the connecting ends of all the LED light-emitting units are the positive poles of the LED light-emitting circuit, and the negative poles of all the LED light-emitting units are connected, and the connecting ends of all the LED light-emitting units are the negative poles of the LED light-emitting circuit.
Compared with the prior art, the invention has the advantages that by arranging the buck-boost constant current circuit, the high-frequency conduction circuit and the controllable rectification circuit, when the commercial power low-frequency alternating current is connected, the high-frequency conduction circuit is in an open circuit high-resistance state, the voltage input into the high-frequency conduction circuit can be converted into high-frequency pulse current with constant magnitude by the voltage-boosting constant-current circuit, under the condition of meeting the harmonic wave of input current, the high-frequency voltage can be output, when the high-frequency voltage of the electronic ballast is connected, the high-frequency conduction circuit is in a short-circuit conduction state, and the B-class lightning protection circuit is in a short-circuit conduction state under the condition of high-frequency input, the output end of the buck-boost constant current circuit keeps an open circuit state, so that the voltage loaded between the input end and the grounding end of the buck-boost constant current circuit cannot enable the buck-boost constant current circuit to work, and the output end of the buck-boost constant current circuit is in the open circuit state, so that the working states of the high-frequency conduction circuit and the controllable rectifying circuit cannot be influenced; when the invention is used as a B-type LED fluorescent lamp circuit and is connected with mains supply low-frequency alternating current, the connecting end of the output ends of the first rectifying circuit and the second rectifying circuit outputs direct-current voltage, the output end and the grounding end of the B-type anti-electric shock circuit are conducted after judging that the B-type LED fluorescent lamp circuit belongs to the state of normally connecting the mains supply, the direct-current voltage output by the first rectifying circuit and the second rectifying circuit passes through an EMI circuit and then supplies power to a buck-boost constant-current circuit, and the buck-boost constant-current circuit converts the voltage input into high-frequency pulse current with constant magnitude, the high-frequency pulse current is changed into smooth voltage through the filter circuit to supply power to the LED light-emitting circuit, the LED light-emitting circuit emits light, in the working process, the high-frequency conduction circuit is connected with the low-frequency voltage of the commercial power and is in an open circuit state, the voltage trigger threshold of the voltage trigger circuit cannot be reached by the conventional commercial power voltage, so that the voltage trigger circuit cannot be conducted, the controllable rectifier circuit is in an output open circuit state, and the high-frequency conduction circuit, the voltage trigger circuit and the controllable rectifier circuit do not influence the normal work of other circuits in the LED daylight lamp circuit; when the high-frequency conduction circuit is connected to the output end of the electronic ballast as a class A fluorescent lamp circuit by double-end input, the high-frequency conduction circuit is conducted at the moment, the high-frequency voltage of the electronic ballast connected from the LED fluorescent lamp tube connecting pins P1 and P4 is loaded to the first input end and the second input end of the controllable rectifying circuit, after high-frequency rectification in the controllable rectifying circuit, direct-current voltage is output between the positive control end and the negative control end of the controllable rectifying circuit, when the direct-current voltage is greater than the voltage trigger threshold value of the voltage trigger circuit, short circuit is generated between the positive electrode and the negative electrode of the voltage trigger circuit, the positive output end of the controllable rectifying circuit outputs direct-current voltage, meanwhile, the electronic ballast is converted into a constant-current output state from a high-voltage output state, and the high-frequency alternating constant current output by the electronic ballast is converted into a high, after passing through the filter circuit, the LED light-emitting circuit is provided with direct current with small fluctuation, so that the LED fluorescent lamp emits light; the buck-boost constant current circuit can convert voltage input into the buck-boost constant current circuit into high-frequency pulse current with constant magnitude, can provide higher working voltage for the LED light-emitting circuit on the basis of lower cost, and can meet the requirement of a user on maximum power no matter being used as an A-type LED fluorescent lamp circuit or a B-type LED fluorescent lamp circuit.
Drawings
FIG. 1 is an external view of a conventional fluorescent tube;
FIG. 2 is a schematic block diagram of a conventional circuit of a double-input A + B LED fluorescent lamp;
FIG. 3 is a schematic block diagram of the structure of the double-input A + B LED fluorescent lamp circuit of the present invention;
FIG. 4 is a circuit diagram of a double-input A + B class LED fluorescent lamp circuit of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The first embodiment is as follows: as shown in FIG. 3, a dual-end input A + B class LED fluorescent lamp circuit comprises a first rectifying circuit, a second rectifying circuit, an EMI circuit, an LED light-emitting circuit, a filter circuit, a B class anti-electric shock circuit and a voltage trigger circuit, wherein the first rectifying circuit and the second rectifying circuit respectively have a live wire input end, a zero wire input end, an output end and a grounding end, the EMI circuit has an input end, an output end and a grounding end, the LED light-emitting circuit, the filter circuit and the voltage trigger circuit respectively have a positive electrode and a negative electrode, the B class anti-electric shock circuit has a detection end, an output end and a grounding end, the output end of the first rectifying circuit, the output end of the second rectifying circuit, the detection end of the B class anti-electric shock circuit and the input end of the EMI circuit are connected, the grounding end of the EMI circuit is connected with the output end of the B class anti-electric shock circuit, the grounding end of the first rectifying circuit, the grounding, the A + B class LED fluorescent lamp circuit with double-end input further comprises a buck-boost constant current circuit, a high-frequency conduction circuit and a controllable rectification circuit, wherein the high-frequency conduction circuit is provided with an input end and an output end, the buck-boost constant current circuit is provided with an input end, a grounding end, a positive output end and a negative output end, the controllable rectification circuit is provided with a first input end, a second input end, a positive output end, a negative output end, a positive control end and a negative control end, the input end of the high-frequency conduction circuit is connected with the live wire input end of the first rectification circuit, the first input end of the controllable rectification circuit is connected with the live wire input end of the second rectification circuit, the output end of the EMI circuit is connected with the input end of the buck-boost constant current circuit, the grounding end of the buck-boost constant current circuit is connected with the output end of the B class anti-surge circuit, the positive, the negative output end of the buck-boost constant current circuit, the negative output end of the controllable rectifying circuit, the negative electrode of the filter circuit and the negative electrode of the LED light-emitting circuit are connected, the second input end of the controllable rectifying circuit is connected with the output end of the high-frequency conduction circuit, the positive control end of the controllable rectifying circuit is connected with the positive electrode of the voltage trigger circuit, and the negative control end of the controllable rectifying circuit is connected with the negative electrode of the voltage trigger circuit.
Example two: this embodiment is substantially the same as the first embodiment, except that:
as shown in fig. 4, in this embodiment, the buck-boost constant current circuit includes a first capacitor C1, a second capacitor C2, a first diode D1, a second diode D2, a first resistor R1, a second resistor R2, a third resistor R3, a first inductor L1 and a first integrated circuit chip U1, the model of the first integrated circuit chip U1 is MT7845, the first diode D1 and the second diode D2 are both high-frequency rectifier diodes, the 5 th pin and the 6 th pin of the first integrated circuit chip U1 are connected and the connection end of the first diode D1 is the input end of the buck-boost constant current circuit, the positive electrode of the first diode D1 is the negative output end of the buck-boost constant current circuit, the negative electrode of the second diode D2 is the positive output end of the buck-boost constant current circuit, the negative electrode of the first diode D1, one end of the third resistor R3 and the 4 th pin of the first integrated circuit chip U1 are connected, the first pin 1 of the first integrated circuit chip U1 is connected with the first terminal 1 of the first integrated circuit chip U1, the pin 2 of the first integrated circuit chip U1 and one end of the first resistor R1 are connected with one end of the second resistor R2, the pin 3 of the first integrated circuit chip U1 is connected with one end of the second capacitor C2, the other end of the first capacitor C1, the other end of the first resistor R1, the other end of the second capacitor C2, the other end of the third resistor R3 and one end of the first inductor L1 are connected with the pin 7 of the first integrated circuit chip U1, the other end of the second resistor R2, the other end of the first inductor L1 are connected with the positive pole of the second diode D2, and the connection end of the second resistor R2 and the connection end of the first inductor L1 are the ground end of the buck-boost constant current circuit.
In this embodiment, the controllable rectification circuit includes a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, a seventh diode D7 and an eighth diode D8, the third diode D3, the fourth diode D4, the fifth diode D5, the sixth diode D6, the seventh diode D7 and the eighth diode D8 are all high frequency rectification diodes, the cathode of the third diode D3 is connected to the anode of the fourth diode D4 and the connection end thereof is the second input end of the controllable rectification circuit, the anode of the seventh diode D7 is connected to the cathode of the eighth diode D8 and the connection end thereof is the first input end of the controllable rectification circuit, the cathode of the fourth diode D4 is connected to the cathode of the sixth diode D6 and the connection end thereof is the positive output end of the controllable rectification circuit, the anode of the third diode D3 is connected to the anode of the fifth diode D5 and the connection end thereof is the negative output end of the controllable rectification circuit, the cathode of the fifth diode D5 is connected to the cathode of the seventh diode D7, and the connection end thereof is the positive control end of the controllable rectification circuit, and the anode of the sixth diode D6 is connected to the anode of the eighth diode D8, and the connection end thereof is the negative control end of the controllable rectification circuit.
In this embodiment, the high frequency conducting circuit includes a third capacitor C3, one end of the third capacitor C3 is an input end of the high frequency conducting circuit, and the other end of the third capacitor C3 is an output end of the high frequency conducting circuit.
In this embodiment, the class B shock-proof circuit includes a ninth diode D9, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a fourth capacitor C4, a fifth capacitor C5 and a second integrated circuit chip U2, the model of the second integrated circuit chip U2 is DL002, the ninth diode D9 is a rectifier diode, the anode of the ninth diode D9 is the detection end of the class B shock-proof circuit, the cathode of the ninth diode D9 is connected to one end of the fourth resistor R4, the other end of the fourth resistor R4, one end of the fourth capacitor C4 and the 8 th pin of the second integrated circuit chip U2 are connected, one end of the fifth resistor R5, one end of the sixth resistor R6 and the 5 th pin of the second integrated circuit chip U2 are connected, one end of the fifth capacitor C5 and the 6 th pin of the second integrated circuit chip U2 are connected, the connection end of the second integrated circuit chip U464 and the output end of the class B shock-proof circuit chip U464 is connected to the output end of the class B shock-proof circuit chip, the other end of the fifth resistor R5, the other end of the sixth resistor R6, the other end of the fourth capacitor C4, the other end of the fifth capacitor C5 and the 2 nd pin of the second integrated circuit chip U2 are connected, and the connection end of the fifth capacitor C5 and the pin 2 of the second integrated circuit chip U2 are grounded ends of the B-type electric shock preventing circuit.
In this embodiment, the voltage trigger circuit includes a seventh resistor R7, an eighth resistor R8, and a twelfth diode D10, the twelfth diode D10 is a semiconductor discharge diode, one end of the twelfth diode D10 is connected to one end of the seventh resistor R7, and the connection end thereof is the positive electrode of the voltage trigger circuit, the other end of the seventh resistor R7 is connected to one end of the eighth resistor R8, the other end of the eighth resistor R8 is connected to the other end of the twelfth diode D10, and the connection end thereof is the negative electrode of the voltage trigger circuit.
In this embodiment, the EMI circuit includes a second inductor L2, a ninth resistor R9, a sixth capacitor C6, and a seventh capacitor C7, one end of the second inductor L2, one end of the ninth resistor R9, and one end of the sixth capacitor C6 are connected, and a connection end thereof is an input end of the EMI circuit, the other end of the second inductor L2, the other end of the ninth resistor R9, and one end of the seventh capacitor C7 are connected, and a connection end thereof is an output end of the EMI circuit, and the other end of the sixth capacitor C6 and the other end of the seventh capacitor C7 are connected, and a connection end thereof is a ground end of the EMI circuit.
In this embodiment, the filter circuit includes an eighth capacitor C8 and a tenth resistor R10, the eighth capacitor C8 is an electrolytic capacitor, the positive electrode of the eighth capacitor C8 is connected to one end of the tenth resistor R10, and the connection end of the eighth capacitor C8 is the positive electrode of the filter circuit, the negative electrode of the eighth capacitor C8 is connected to the other end of the tenth resistor R10, and the connection end of the eighth capacitor C8 is the negative electrode of the filter circuit.
In this embodiment, the first rectifying circuit includes an eleventh diode D11, a twelfth diode D12, a thirteenth diode D13 and a fourteenth diode D14, the eleventh diode D11, the twelfth diode D12, the thirteenth diode D13 and the fourteenth diode D14 are all high-frequency rectifying diodes, the anode of the eleventh diode D11 is connected to the cathode of the twelfth diode D12, and the connection end thereof is the live input end of the first rectifying circuit, the cathode of the thirteenth diode D13 is connected to the anode of the fourteenth diode D14, and the connection end thereof is the neutral input end of the first rectifying circuit, the cathode of the eleventh diode D11 is connected to the cathode of the fourteenth diode D14, and the connection end thereof is the output end of the first rectifying circuit, the anode of the twelfth diode D12 is connected to the anode of the thirteenth diode D13, and the connection end thereof is the ground end of the first rectifying circuit; the second rectifying circuit comprises a fifteenth diode D15, a sixteenth diode D16, a seventeenth diode D17 and an eighteenth diode D18, the fifteenth diode D15, the sixteenth diode D16, the seventeenth diode D17 and the eighteenth diode D18 are all high-frequency rectifying diodes, the anode of the fifteenth diode D15 is connected with the cathode of the sixteenth diode D16, the connection end of the fifteenth diode D15 is the live wire input end of the second rectifying circuit, the cathode of the seventeenth diode D17 is connected with the anode of the eighteenth diode D18, the connection end of the seventeenth diode D17 is the neutral wire input end of the second rectifying circuit, the cathode of the fifteenth diode D15 is connected with the cathode of the eighteenth diode D18, the connection end of the seventeenth diode D16 is the output end of the second rectifying circuit, the anode of the sixteenth diode D16 is connected with the anode of the seventeenth diode D17.
In this embodiment, the LED light-emitting circuit includes an LED light-emitting unit, each LED light-emitting unit includes n LED lamp beads (LED 1-LEDn) respectively, n is an integer greater than or equal to 2, the negative pole of the mth lamp bead and the positive pole of the (m + 1) th lamp bead are connected, m is 1,2, …, n-1, the positive pole of the 1 st lamp bead is the positive pole of the LED light-emitting unit, the negative pole of the nth lamp bead is the negative pole of the LED light-emitting unit, the positive pole of the LED light-emitting unit is the positive pole of the LED light-emitting circuit, and the negative pole of the LED light-emitting unit is the negative pole of the LED light-emitting circuit.
Claims (9)
1. A kind of A + B type LED daylight lamp circuit of double-end input, including the first rectifier circuit, the second rectifier circuit, EMI circuit, LED luminescent circuit, filter circuit, B type prevent electric shock circuit and voltage trigger circuit, said first rectifier circuit and said second rectifier circuit have live wire input end, zero line input end, output end and earthing terminal respectively, said EMI circuit has input end, output end and earthing terminal, said LED luminescent circuit, said filter circuit and said voltage trigger circuit have positive pole and negative pole respectively, said B type prevent electric shock circuit have detection end, output end and earthing terminal, said output end of the first rectifier circuit, said output end of the second rectifier circuit, said detection end of B type prevent electric shock circuit and said input end of EMI circuit connect, said earthing terminal of EMI circuit and said output end of B type prevent electric shock circuit connect, the LED fluorescent lamp circuit is characterized in that the A + B type LED fluorescent lamp circuit with double input ends comprises a buck-boost constant current circuit, a high-frequency conduction circuit and a controllable rectifying circuit, wherein the high-frequency conduction circuit comprises an input end and an output end, the buck-boost constant current circuit comprises an input end, a grounding end, a positive output end and a negative output end, the controllable rectifying circuit comprises a first input end, a second input end, a positive output end, a negative output end, a positive control end and a negative control end, the input end of the high-frequency conduction circuit is connected with the live wire input end of the first rectifying circuit, the first input end of the controllable rectifying circuit is connected with the live wire input end of the second rectifying circuit, and the output end of the EMI circuit is connected with the input end of the buck-boost constant current circuit, the ground terminal of the buck-boost constant current circuit is connected with the output terminal of the B-type anti-electric-shock circuit, the positive output terminal of the buck-boost constant current circuit, the output terminal of the controllable rectifying circuit and the positive electrode of the filter circuit are connected with the positive electrode of the LED light-emitting circuit, the negative output terminal of the buck-boost constant current circuit, the negative output terminal of the controllable rectifying circuit and the negative electrode of the filter circuit are connected with the negative electrode of the LED light-emitting circuit, the second input terminal of the controllable rectifying circuit is connected with the output terminal of the high-frequency conduction circuit, the positive control terminal of the controllable rectifying circuit is connected with the positive electrode of the voltage trigger circuit, and the negative control terminal of the controllable rectifying circuit is connected with the negative electrode of the voltage trigger circuit; the controllable rectifying circuit comprises a third diode, a fourth diode, a fifth diode, a sixth diode, a seventh diode and an eighth diode, wherein the third diode, the fourth diode, the fifth diode, the sixth diode, the seventh diode and the eighth diode are all high-frequency rectifying diodes, the cathode of the third diode is connected with the anode of the fourth diode, the connecting end of the third diode is the second input end of the controllable rectifying circuit, the anode of the seventh diode is connected with the cathode of the eighth diode, the connecting end of the seventh diode is the first input end of the controllable rectifying circuit, the cathode of the fourth diode is connected with the cathode of the sixth diode, the connecting end of the fourth diode is the positive output end of the controllable rectifying circuit, the anode of the third diode is connected with the anode of the fifth diode, and the connecting end of the third diode is the controllable electrical rectifying circuit And the negative electrode of the fifth diode is connected with the negative electrode of the seventh diode, the connecting end of the fifth diode is the positive control end of the controllable rectifying circuit, the positive electrode of the sixth diode is connected with the positive electrode of the eighth diode, and the connecting end of the sixth diode is the negative control end of the controllable rectifying circuit.
2. The A + B type LED fluorescent lamp circuit with double-end input according to claim 1, wherein the buck-boost constant current circuit comprises a first capacitor, a second capacitor, a first diode, a second diode, a first resistor, a second resistor, a third resistor, a first inductor and a first integrated circuit chip, the model of the first integrated circuit chip is MT7845, the first diode and the second diode are both high-frequency rectifier diodes, the 5 th pin and the 6 th pin of the first integrated circuit chip are connected, the connection end of the first integrated circuit chip is the input end of the buck-boost constant current circuit, the anode of the first diode is the negative output end of the buck-boost constant current circuit, the cathode of the second diode is the positive output end of the buck-boost constant current circuit, the cathode of the first diode, one end of the third resistor and the 4 th pin of the first integrated circuit chip are connected, the 1 st pin of the first integrated circuit chip is connected with one end of the first capacitor, the 2 nd pin of the first integrated circuit chip, one end of the first resistor and one end of the second resistor are connected, the 3 rd pin of the first integrated circuit chip is connected with one end of the second capacitor, the other end of the first resistor, the other end of the second capacitor, the other end of the third resistor, one end of the first inductor and the 7 th pin of the first integrated circuit chip are connected, the other end of the second resistor, the other end of the first inductor and the anode of the second diode are connected, and the connecting end of the second resistor, the other end of the first inductor and the anode of the second diode is the grounding end of the buck-boost constant current circuit.
3. A double-ended input a + B type LED fluorescent lamp circuit according to claim 1, wherein the high frequency conducting circuit comprises a third capacitor, one end of the third capacitor is an input end of the high frequency conducting circuit, and the other end of the third capacitor is an output end of the high frequency conducting circuit.
4. The circuit of claim 1, wherein the class B anti-surge circuit comprises a ninth diode, a fourth resistor, a fifth resistor, a sixth resistor, a fourth capacitor, a fifth capacitor and a second IC chip, the type of the second IC chip is DL002, the ninth diode is a rectifier diode, the anode of the ninth diode is the detection terminal of the class B anti-surge circuit, the cathode of the ninth diode is connected with one end of the fourth resistor, the other end of the fourth resistor, one end of the fourth capacitor and the pin 8 of the second IC chip are connected, one end of the fifth resistor, one end of the sixth resistor and the pin 5 of the second IC chip are connected, one end of the fifth capacitor and the pin 6 of the second IC chip are connected, the 3 rd pin and the 4 th pin of the second integrated circuit chip are connected and the connecting end of the second integrated circuit chip is the output end of the B-type anti-electric-shock circuit, the other end of the fifth resistor, the other end of the sixth resistor, the other end of the fourth capacitor, the other end of the fifth capacitor and the 2 nd pin of the second integrated circuit chip are connected and the connecting end of the second integrated circuit chip is the grounding end of the B-type anti-electric-shock circuit.
5. A double-ended input a + B type LED fluorescent lamp circuit according to claim 1, wherein the voltage trigger circuit comprises a seventh resistor, an eighth resistor, and a twelfth diode, the twelfth diode is a discharge diode, one end of the twelfth diode is connected to one end of the seventh resistor and the connection end thereof is the positive electrode of the voltage trigger circuit, the other end of the seventh resistor is connected to one end of the eighth resistor, the other end of the eighth resistor is connected to the other end of the twelfth diode and the connection end thereof is the negative electrode of the voltage trigger circuit.
6. The circuit of claim 1, wherein the EMI circuit comprises a second inductor, a ninth resistor, a sixth capacitor and a seventh capacitor, one end of the second inductor, one end of the ninth resistor and one end of the sixth capacitor are connected, and the connection end thereof is the input end of the EMI circuit, the other end of the second inductor, the other end of the ninth resistor and one end of the seventh capacitor are connected, and the connection end thereof is the output end of the EMI circuit, the other end of the sixth capacitor and the other end of the seventh capacitor are connected, and the connection end thereof is the ground end of the EMI circuit.
7. A double-input a + B type LED fluorescent lamp circuit according to claim 1, wherein the filter circuit comprises an eighth capacitor and a tenth resistor, the eighth capacitor is an electrolytic capacitor, an anode of the eighth capacitor is connected to one end of the tenth resistor, a connection end of the eighth capacitor is an anode of the filter circuit, a cathode of the eighth capacitor is connected to the other end of the tenth resistor, and a connection end of the eighth capacitor is a cathode of the filter circuit.
8. The double-end-input A + B type LED fluorescent lamp circuit according to claim 1, characterized in that the first rectifying circuit comprises an eleventh diode, a twelfth diode, a thirteenth diode and a fourteenth diode, wherein the eleventh diode, the twelfth diode, the thirteenth diode and the fourteenth diode are all high-frequency rectifying diodes, the anode of the eleventh diode is connected with the cathode of the twelfth diode and the connection end thereof is the live wire input end of the first rectifying circuit, the cathode of the thirteenth diode is connected with the anode of the fourteenth diode and the connection end thereof is the neutral wire input end of the first rectifying circuit, the cathode of the eleventh diode is connected with the cathode of the fourteenth diode and the connection end thereof is the output end of the first rectifying circuit, the anode of the twelfth diode is connected with the anode of the thirteenth diode, and the connecting end of the twelfth diode is the grounding end of the first rectifying circuit; the second rectifying circuit comprises a fifteenth diode, a sixteenth diode, a seventeenth diode and an eighteenth diode, the fifteenth diode, the sixteenth diode, the seventeenth diode and the eighteenth diode are all high-frequency rectifier diodes, the anode of the fifteenth diode is connected with the cathode of the sixteenth diode, and the connection end of the fifteenth diode is the live wire input end of the second rectifying circuit, the cathode of the seventeenth diode is connected with the anode of the eighteenth diode, the connecting end of the seventeenth diode is the zero line input end of the second rectifying circuit, the cathode of the fifteenth diode is connected with the cathode of the eighteenth diode, and the connection end of the fifteenth diode is the output end of the second rectifying circuit, the anode of the sixteenth diode is connected with the anode of the seventeenth diode, and the connection end of the sixteenth diode is the grounding end of the second rectifying circuit.
9. The circuit of claim 1, wherein the LED lighting circuit comprises at least one LED lighting unit, each LED lighting unit comprises n LED light beads, n is an integer greater than or equal to 2, the negative electrode of the mth light bead is connected to the positive electrode of the m +1 th light bead, m is 1,2, …, n-1, the positive electrode of the 1 st light bead is the positive electrode of the LED lighting unit, the negative electrode of the nth light bead is the negative electrode of the LED lighting unit, the positive electrodes of all the LED lighting units are connected and the connection end thereof is the positive electrode of the LED lighting circuit, the negative electrodes of all the LED lighting units are connected and the connection end thereof is the negative electrode of the LED lighting circuit.
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| CN201811453480.1A CN109587878B (en) | 2018-11-30 | 2018-11-30 | A + B type LED fluorescent lamp circuit with double-end input |
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| CN201811453480.1A CN109587878B (en) | 2018-11-30 | 2018-11-30 | A + B type LED fluorescent lamp circuit with double-end input |
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| CN206564714U (en) * | 2017-03-09 | 2017-10-17 | 东莞泛美光电有限公司 | The LED drive circuit of compatible ballast |
| CN106937444B (en) * | 2017-03-23 | 2018-09-28 | 东莞泛美光电有限公司 | The LED drive circuit of controllable leakage current and compatible ballast |
| CN207251959U (en) * | 2017-08-08 | 2018-04-17 | 深圳市福瑞新科技有限公司 | A kind of LED lamp tube compatible circuit and LED lamp tube |
| CN107396497B (en) * | 2017-08-15 | 2023-11-10 | 浙江阳光美加照明有限公司 | LED lamp tube with single-end and double-end power supply and driving circuit |
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