CN212992653U - Linear constant-current LED lamp circuit working at wide voltage - Google Patents
Linear constant-current LED lamp circuit working at wide voltage Download PDFInfo
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- CN212992653U CN212992653U CN202020977842.3U CN202020977842U CN212992653U CN 212992653 U CN212992653 U CN 212992653U CN 202020977842 U CN202020977842 U CN 202020977842U CN 212992653 U CN212992653 U CN 212992653U
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Abstract
The utility model discloses a linear constant current LED lamp circuit of wide voltage work, including rectifier circuit, first LED lighting circuit, second LED lighting circuit, two sections linear constant current circuit, one-way conduction circuit and controllable linear constant current circuit, the conduction voltage of first LED lighting circuit and second LED lighting circuit equals, through two sections linear constant current circuit, one-way conduction circuit and controllable linear constant current circuit control flow through the electric current on first LED lighting circuit and second LED lighting circuit, make first LED lighting circuit and second LED lighting circuit give out light or not give out light simultaneously; the LED lighting circuit has the advantages that when the alternating-current voltage of the accessed mains supply changes, the two LED lighting circuits can emit light at the same time or do not emit light at the same time, the light is emitted uniformly, and the misunderstanding of failure can not be caused.
Description
Technical Field
The utility model relates to a linear constant current LED lamp circuit especially relates to a linear constant current LED lamp circuit of wide voltage work.
Background
As shown in fig. 1, a linear constant current LED lamp circuit operating at a wide voltage in the prior art mainly includes a rectifying circuit, a first LED light emitting circuit, a second LED light emitting circuit, and two segments of linear constant current circuits. The rectification circuit is provided with a live wire input end, a zero wire input end, an output end and a grounding end, the first LED light-emitting circuit and the second LED light-emitting circuit are respectively provided with a positive electrode and a negative electrode, the two sections of linear constant current circuits are provided with a first output end, a second output end and a negative electrode, the inside of the two sections of linear constant current circuits is provided with a maximum conduction current value of the first output end and a maximum conduction current value of the second output end, the maximum conduction current value of the second output end is larger than or equal to the maximum conduction current value of the first output end, when the current flowing into the second output end of the two sections of linear constant current circuits is larger than or equal to the maximum conduction current value of the first output end, the current flowing into the first; when the current flowing into the second output ends of the two linear constant current circuits is smaller than the maximum conduction current value of the first output ends of the two linear constant current circuits, the maximum current value flowing into the first output ends of the two linear constant current circuits is the difference value of the current flowing into the second output ends subtracted from the maximum conduction current value of the first output ends of the two linear constant current circuits, the output ends of the rectifying circuit are connected with the anode of the first LED light-emitting circuit, the cathode of the first LED light-emitting circuit and the anode of the second LED light-emitting circuit are connected with the first output ends of the two linear constant current circuits, the cathode of the second LED light-emitting circuit is connected with the second output ends of the two linear constant current circuits, and the cathodes. When the live wire input end and the zero line input end of the rectifying circuit are connected with commercial power, the rectifying circuit converts the connected commercial power alternating-current voltage into direct-current voltage and outputs the direct-current voltage between the output end and the grounding end of the rectifying circuit, when the direct-current voltage output between the output end and the grounding end of the rectifying circuit is larger than or equal to the sum of the conduction voltages of the first LED light-emitting circuit and the second LED light-emitting circuit, the current between the second output end and the negative electrode of the two linear constant-current circuits is the maximum conduction current value of the second output end of the two linear constant-current circuits, the first output end and the negative electrode of the two linear constant-current circuits are cut off, the current flowing through the first LED light-emitting circuit and the second LED light-emitting circuit is equal at the moment, the current is the maximum conduction current value set by the second output. When the direct current voltage output between the output end and the grounding end of the rectifying circuit is smaller than the sum of the conduction voltages of the first LED light-emitting circuit and the second LED light-emitting circuit and larger than the conduction voltage of the first LED light-emitting circuit, the direct current voltage output between the output end and the grounding end of the rectifying circuit cannot enable the first LED light-emitting circuit and the second LED light-emitting circuit to be conducted in series, so that the current flowing into the second output end of the two sections of linear constant current circuits is zero, no current is output from the second output end of the two sections of linear constant current circuits, the first output end and the negative electrode of the two sections of linear constant current circuits are conducted in a constant current mode, the current is the maximum conduction current value set by the first output end, at the moment, the first LED light-emitting circuit emits light, and the second LED light. When the direct current voltage output between the output end and the grounding end of the rectifying circuit is smaller than the conduction voltage of the first LED light-emitting circuit, no current passes through the first LED light-emitting circuit and the second LED light-emitting circuit, and no light is emitted.
According to the linear constant-current LED lamp circuit working at the wide voltage, as long as the direct-current voltage output after the connected mains supply alternating-current voltage is rectified by the rectifying circuit meets the condition that the direct-current voltage is greater than or equal to the conduction voltage of the first LED light-emitting circuit, the linear constant-current LED lamp circuit working at the wide voltage can emit light, and the requirement of working at the wide voltage is met. However, when the linear constant current LED lamp circuit working at a wide voltage is at a low mains voltage, only the first LED light emitting circuit emits light, and the second LED light emitting circuit cannot emit light, so that when the linear constant current LED lamp circuit working at a wide voltage is installed in a lamp capable of seeing the light emitting condition of the internal LED light emitting circuit, when only the first LED light emitting circuit emits light and the second LED light emitting circuit does not emit light, uneven light emission is directly shown, on one hand, the linear constant current LED lamp circuit is easily misinterpreted as failure of the second LED light emitting circuit, and on the other hand, the second LED light emitting circuit does not emit light, which causes uneven light emission of the whole lamp, and affects the lighting effect.
Disclosure of Invention
The utility model aims to solve the technical problem that a linear constant current LED lamp circuit of wide voltage work that the utility model provides an when the commercial power alternating voltage who inserts changes, two LED luminescent circuit perhaps give out light simultaneously, perhaps do not give out light simultaneously, and it is even to give out light, can not cause the failure of mistake to understand.
The utility model provides a technical scheme that above-mentioned technical problem adopted does: a linear constant current LED lamp circuit working under wide voltage comprises a rectifying circuit, a first LED light-emitting circuit, a second LED light-emitting circuit and two sections of linear constant current circuits, wherein the rectifying circuit is provided with a live wire input end, a zero wire input end, an output end and a grounding end, the first LED light-emitting circuit and the second LED light-emitting circuit are respectively provided with a positive electrode and a negative electrode, the two sections of linear constant current circuits are provided with a first output end, a second output end and a negative electrode, the maximum conduction current value of the first output end and the maximum conduction current value of the second output end of the two sections of linear constant current circuits are arranged in the two sections of linear constant current circuits, the maximum conduction current value of the second output end of the two sections of linear constant current circuits is larger than or equal to the maximum conduction current value of the first output end of the two sections of linear constant current circuits, when the current flowing in the second output end of, the current flowing into the first output end of the two linear constant current circuits is zero, when the current flowing into the second output end of the two linear constant current circuits is smaller than the maximum conduction current value of the first output end, the maximum current flowing into the first output end of the two linear constant current circuits is equal to the difference value of the maximum conduction current value of the first output end minus the current flowing into the second output end of the two linear constant current circuits, the conduction voltages of the first LED light-emitting circuit and the second LED light-emitting circuit are equal, the output end of the rectifying circuit is connected with the anode of the first LED light-emitting circuit, the cathode of the first LED light-emitting circuit is connected with the first output ends of the two linear constant current circuits, the cathode of the second LED light-emitting circuit is connected with the second output ends of the two linear constant current circuits, and the cathodes of the two linear constant current circuits are connected with the grounding end of the rectifying circuit, the linear constant current LED lamp circuit working under wide voltage further comprises a one-way conduction circuit and a controllable linear constant current circuit, wherein the one-way conduction circuit is provided with a positive electrode and a negative electrode, when the voltage of the positive electrode of the one-way conduction circuit is larger than or equal to the voltage of the negative electrode of the one-way conduction circuit, the positive electrode and the negative electrode of the one-way conduction circuit are conducted, when the voltage of the positive electrode of the one-way conduction circuit is smaller than the voltage of the negative electrode of the one-way conduction circuit, the positive electrode and the negative electrode of the one-way conduction circuit are cut off, the controllable linear constant current circuit is provided with an output end, a negative electrode and a control end, the maximum conduction current value of the output end of the controllable linear constant current circuit is preset in the controllable linear constant current circuit, the maximum conduction current value of the output end of the controllable linear constant current circuit is half of the maximum conduction current value of the first, the output end and the negative electrode of the controllable linear constant current circuit are connected, when the current flowing into the control end of the controllable linear constant current circuit is larger than or equal to the maximum conduction current value of the output end, the output end and the negative electrode of the controllable linear constant current circuit are cut off, when the current flowing into the control end of the controllable linear constant current circuit is larger than 0 and smaller than the maximum conduction current value of the output end, the maximum conduction current between the output end and the negative electrode of the controllable linear constant current circuit is equal to the difference value of the maximum conduction current value of the output end minus the current currently accessed by the control end of the controllable linear constant current circuit, the output end of the controllable linear constant current circuit is connected with the positive electrode of the first LED light-emitting circuit, the positive electrode of the unidirectional conduction circuit is connected with the negative electrode of the first LED light-emitting circuit, the negative electrode of the unidirectional conduction circuit is connected with the control end of the controllable linear constant current circuit, and, when the live wire input end and the zero line input end of the rectifying circuit are connected with commercial power, the rectifying circuit converts commercial power alternating-current voltage into direct-current voltage to be output between the output end and the grounding end, at the moment, if the direct-current voltage output by the rectifying circuit is more than or equal to the sum of the conducting voltages of the first LED light-emitting circuit and the second LED light-emitting circuit, the anode and the cathode of the one-way conducting circuit are conducted, the current flowing through the first LED light-emitting circuit, the one-way conducting circuit and the second LED light-emitting circuit is equal to the maximum conducting current value set by the second output end of the two linear constant current circuits, at the moment, the first LED light-emitting circuit and the second LED light-emitting circuit both emit light, and the current flowing into the output end of the controllable linear constant current circuit and the first output end of the two linear constant current circuits is zero, if the direct current voltage output by the rectifying circuit is smaller than the sum of the conduction voltages of the first LED light-emitting circuit and the second LED light-emitting circuit, the direct current voltage output by the rectifying circuit cannot enable the first LED light-emitting circuit and the second LED light-emitting circuit to be simultaneously conducted, the current flowing through the one-way conduction circuit is zero, the anode and the cathode of the one-way conduction circuit are cut off, the current flowing between the output end and the cathode of the controllable linear constant current circuit is the maximum conduction current value set by the output end of the controllable linear constant current circuit, the current flowing through the second LED light-emitting circuit and the current flowing into the second output end of the two linear constant current circuits are the maximum conduction current value set by the output end of the controllable linear constant current circuit, and the current flowing into the first output end of the two linear constant current circuits is the maximum conduction current value set by the first output end of the two linear constant current circuits And when the direct current voltage output by the rectifying circuit is less than the conduction voltage of the first LED light-emitting circuit, the first LED light-emitting circuit and the second LED light-emitting circuit do not emit light.
The controllable linear constant current circuit comprises a first integrated circuit chip and a first resistor, wherein the first integrated circuit chip is realized by adopting a universal three-terminal linear constant current chip with the model number SM2082, the 1 st pin of the first integrated circuit chip is the output end of the controllable linear constant current circuit, the 3 rd pin of the first integrated circuit chip is connected with one end of the first resistor, the connecting end of the first integrated circuit chip is the control end of the controllable linear constant current circuit, the 2 nd pin of the first integrated circuit chip is connected with the other end of the first resistor, and the connecting end of the first integrated circuit chip is the negative electrode of the controllable linear constant current circuit.
The two linear constant current circuits comprise a second integrated circuit chip and a second resistor, the model of the second integrated circuit chip is SM2086, the 8 th pin of the second integrated circuit chip is the first output end of the two linear constant current circuits, the 5 th pin of the second integrated circuit chip is the second output end of the two linear constant current circuits, the 1 st pin of the second integrated circuit chip is connected with one end of the second resistor, the other end of the second resistor is connected with the 4 th pin of the second integrated circuit chip, and the connecting end of the second resistor is the negative electrode of the two linear constant current circuits.
The unidirectional conduction circuit is realized by adopting a rectifier diode, the anode of the rectifier diode is the anode of the unidirectional conduction circuit, and the cathode of the rectifier diode is the cathode of the unidirectional conduction circuit.
The first LED luminous circuit is formed by connecting n first LED luminous bodies in series, the positive electrode of the 1 st first LED luminous body is the positive electrode of the first LED luminous circuit, the negative electrode of the nth first LED luminous body is the negative electrode of the first LED luminous circuit, the negative electrode of the kth first LED luminous body is connected with the positive electrode of the (k + 1) th first LED luminous body, k is 1, 2, …, n-1, the second LED luminous circuit is formed by connecting n second LED luminous bodies in series, the positive electrode of the 1 st second LED luminous body is the positive electrode of the second LED luminous circuit, the negative electrode of the nth second LED luminous body is the negative electrode of the second LED luminous circuit, the negative electrode of the kth second LED luminous body is connected with the positive electrode of the (k + 1) th second LED luminous body, n is an integer more than or equal to 2, the first LED luminous body and the second LED luminous body are the same in specification and model.
The rectifier circuit adopts full-bridge rectifier circuit to realize, two interchange input feet of full-bridge rectifier circuit do respectively the live wire input end and zero line input end of rectifier circuit, full-bridge rectifier circuit's positive voltage output foot do rectifier circuit's output, full-bridge rectifier circuit's negative voltage output foot do rectifier circuit's earthing terminal.
Compared with the prior art, the utility model has the advantages that by arranging the one-way conduction circuit and the controllable linear constant current circuit, the one-way conduction circuit has an anode and a cathode, when the anode voltage of the one-way conduction circuit is more than or equal to the cathode voltage, the anode and the cathode of the one-way conduction circuit are conducted, when the anode voltage of the one-way conduction circuit is less than the cathode voltage, the anode and the cathode of the one-way conduction circuit are cut off, the controllable linear constant current circuit has an output end, a cathode and a control end, the maximum conduction current value of the output end of the controllable linear constant current circuit is preset in the controllable linear constant current circuit, the maximum conduction current value of the output end of the controllable linear constant current circuit is half of the maximum conduction current value of the first output end of the two sections of linear constant current circuits, when the control end of the controllable linear constant current circuit has, when the current flowing into the control end of the controllable linear constant current circuit is larger than or equal to the maximum conduction current value of the output end of the controllable linear constant current circuit, the output end and the negative electrode of the controllable linear constant current circuit are cut off, when the current flowing into the control end of the controllable linear constant current circuit is larger than 0 and smaller than the maximum conduction current value of the output end of the controllable linear constant current circuit, the maximum conduction current between the output end and the negative electrode of the controllable linear constant current circuit is equal to the difference value of the maximum conduction current value of the output end minus the current currently connected into the control end of the controllable linear constant current circuit, the output end of the controllable linear constant current circuit is connected with the positive electrode of the first LED light-emitting circuit, the positive electrode of the unidirectional conduction circuit is connected with the negative electrode of the first LED light-emitting circuit, the negative electrode of the unidirectional conduction circuit is connected with the control end of, the rectifying circuit converts alternating-current voltage of commercial power into direct-current voltage and outputs the direct-current voltage between an output end and a ground end, at the moment, if the direct-current voltage output by the rectifying circuit is larger than or equal to the sum of conducting voltages of the first LED light-emitting circuit and the second LED light-emitting circuit, the positive electrode and the negative electrode of the one-way conducting circuit are conducted, the current flowing through the first LED light-emitting circuit, the one-way conducting circuit and the second LED light-emitting circuit is equal to the maximum conducting current value set by the second output end of the two linear constant-current circuits, at the moment, the first LED light-emitting circuit and the second LED light-emitting circuit both emit light, the current flowing into the output end of the controllable linear constant-current circuit and the first output end of the two linear constant-current circuits is zero, and if the direct-current voltage output by the rectifying circuit is smaller than the sum of the conducting voltages of the first LED light-emitting circuit and the, the current flowing through the one-way conduction circuit is zero, the anode and the cathode of the one-way conduction circuit are cut off, the magnitude of the current flowing between the output end and the cathode of the controllable linear constant current circuit is the maximum conduction current value set by the output end of the controllable linear constant current circuit, the magnitudes of the currents flowing through the second LED light-emitting circuit and the second output ends of the two sections of linear constant current circuits are the maximum conduction current values set by the output end of the controllable linear constant current circuit, the magnitude of the current flowing into the first output end of the two sections of linear constant current circuits is half of the maximum conduction current value set by the first output end of the two sections of linear constant current circuits, the current flowing through the first LED light-emitting circuit is half of the maximum conduction current value set by the first output end of the two sections of linear constant current circuits, the first LED light-emitting circuit and the second LED light-emitting circuit both emit light, when the direct current voltage output by the, first LED light emitting circuit and second LED light emitting circuit all do not give out light, from this the utility model discloses when the commercial power alternating voltage who inserts changes, two LED light emitting circuits perhaps give out light simultaneously, perhaps do not give out light simultaneously, and it is even to give out light, can not cause the inefficacy misunderstanding.
Drawings
FIG. 1 is a block diagram of a conventional linear constant current LED lamp circuit operating at a wide voltage;
fig. 2 is a block diagram of the linear constant current LED lamp circuit of the present invention;
fig. 3 is a circuit diagram of the linear constant current LED lamp circuit of the present invention operating at a wide voltage.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
Example (b): as shown in FIG. 2, a linear constant current LED lamp circuit working at a wide voltage comprises a rectifying circuit, a first LED light-emitting circuit, a second LED light-emitting circuit and two sections of linear constant current circuits, wherein the rectifying circuit is provided with a live wire input end, a zero wire input end, an output end and a grounding end, the first LED light-emitting circuit and the second LED light-emitting circuit are both provided with a positive electrode and a negative electrode, the two sections of linear constant current circuits are provided with a first output end, a second output end and a negative electrode, the maximum conduction current value of the first output end and the maximum conduction current value of the second output end are arranged in the two sections of linear constant current circuits, the maximum conduction current value of the second output end of the two sections of linear constant current circuits is larger than or equal to the maximum conduction current value of the first output end, when the current flowing in the second output end of the two sections of linear constant current circuits is larger than, when the current flowing into the second output ends of the two linear constant current circuits is smaller than the maximum conduction current value of the first output ends, the maximum current flowing into the first output ends is equal to the difference value of the current flowing into the second output ends subtracted from the maximum conduction current value of the first output ends, the conduction voltages of the first LED light-emitting circuit and the second LED light-emitting circuit are equal, the output end of the rectifying circuit is connected with the anode of the first LED light-emitting circuit, the cathode of the first LED light-emitting circuit is connected with the first output ends of the two linear constant current circuits, the cathode of the second LED light-emitting circuit is connected with the second output ends of the two linear constant current circuits, the cathodes of the two linear constant current circuits are connected with the grounding end of the rectifying circuit, the linear constant current LED lamp circuit working at wide voltage further comprises a one-way conduction circuit and a controllable linear constant current circuit, the one-way conduction, when the voltage of the positive pole of the unidirectional conduction circuit is more than or equal to the voltage of the negative pole of the unidirectional conduction circuit, the positive pole and the negative pole of the unidirectional conduction circuit are conducted, when the voltage of the positive pole of the unidirectional conduction circuit is less than the voltage of the negative pole of the unidirectional conduction circuit, the unidirectional conduction circuit is cut off, the controllable linear constant current circuit is provided with an output end, a negative pole and a control end, the maximum conduction current value of the output end of the controllable linear constant current circuit is preset in the controllable linear constant current circuit, the maximum conduction current value of the output end of the controllable linear constant current circuit is half of the maximum conduction current value of the first output end of the two linear constant current circuits, when no current flows in the control end of the controllable linear constant current circuit, the output end and the negative pole of the controllable linear constant current circuit are conducted, when the current flowing in the control end of the controllable linear constant current circuit is more than or equal to the maximum conduction current value of When the live wire input end and the zero line input end of the rectifying circuit are connected with commercial power, the rectifying circuit converts commercial power alternating voltage into direct voltage to be output between the output end and the grounding end, and at the moment, if the direct voltage output by the rectifying circuit is more than or equal to the sum of the conducting voltages of the first LED light-emitting circuit and the second LED light-emitting circuit, the positive electrode and the negative electrode of the one-way conduction circuit are conducted, the current flowing through the first LED light-emitting circuit, the one-way conduction circuit and the second LED light-emitting circuit is equal to the maximum conduction current value set by the second output end of the two sections of linear constant current circuits, at the moment, the first LED light-emitting circuit and the second LED light-emitting circuit both emit light, the current flowing into the output end of the controllable linear constant current circuit and the first output end of the two sections of linear constant current circuits is zero, if the direct current voltage output by the rectifying circuit is less than the sum of the conduction voltages of the first LED light-emitting circuit and the second LED light-emitting circuit, the direct current voltage output by the rectifying circuit cannot enable the first LED light-emitting circuit and the second LED light-emitting circuit to be simultaneously conducted, the current flowing through the one-way conduction circuit is zero, the positive pole and the negative pole of the one-way conduction circuit are cut off, and the current flowing between the output end and the negative pole of the controllable linear constant current, the current flowing through the second LED light-emitting circuit and the current flowing into the second output ends of the two sections of linear constant current circuits are the maximum conduction current values set by the output ends of the controllable linear constant current circuits, the current flowing into the first output ends of the two sections of linear constant current circuits is half of the maximum conduction current value set by the first output ends of the two sections of linear constant current circuits, the current flowing through the first LED light-emitting circuit is half of the maximum conduction current value set by the first output ends of the two sections of linear constant current circuits, the first LED light-emitting circuit and the second LED light-emitting circuit both emit light, and when the direct current voltage output by the rectifying circuit is smaller than the conduction voltage of the first LED light-emitting circuit, the first LED light-emitting circuit and the second LED light-emitting circuit do not.
As shown in fig. 3, in this embodiment, the controllable linear constant current circuit includes a first integrated circuit chip U1 and a first resistor R1, the first integrated circuit chip U1 is implemented by a general three-terminal linear constant current chip of model SM2082, a 1 st pin of the first integrated circuit chip U1 is an output terminal of the controllable linear constant current circuit, a 3 rd pin of the first integrated circuit chip U1 is connected to one end of the first resistor R1, and a connection terminal thereof is a control terminal of the controllable linear constant current circuit, a 2 nd pin of the first integrated circuit chip U1 is connected to the other end of the first resistor R1, and a connection terminal thereof is a negative electrode of the controllable linear constant current circuit.
As shown in fig. 3, in this embodiment, the two segments of linear constant current circuits include a second integrated circuit chip U2 and a second resistor R2, the model of the second integrated circuit chip U2 is SM2086, the 8 th pin of the second integrated circuit chip U2 is a first output end of the two segments of linear constant current circuits, the 5 th pin of the second integrated circuit chip U2 is a second output end of the two segments of linear constant current circuits, the 1 st pin of the second integrated circuit chip U2 is connected to one end of a second resistor R2, the other end of the second resistor R2 is connected to the 4 th pin of the second integrated circuit chip U2, and the connection end of the second resistor R2 is a negative electrode of the two segments of linear constant current circuits.
As shown in fig. 3, in the present embodiment, the unidirectional conducting circuit is implemented by using a rectifying diode D1, the anode of the rectifying diode D1 is the anode of the unidirectional conducting circuit, and the cathode of the rectifying diode D1 is the cathode of the unidirectional conducting circuit.
As shown in fig. 3, in this embodiment, the first LED lighting circuit is formed by connecting n first LED luminaries LED1-1 to LED1-n in series, the positive electrode of the 1 st first LED luminary is the positive electrode of the first LED lighting circuit, the negative electrode of the nth first LED luminary is the negative electrode of the first LED lighting circuit, the negative electrode of the kth first LED luminary is connected to the positive electrode of the k +1 th first LED luminary, k is 1, 2, …, n-1, the second LED lighting circuit is formed by connecting n second LED luminaries LED2-1 to LED2-n in series, the positive electrode of the 1 st second LED luminary is the positive electrode of the second LED lighting circuit, the negative electrode of the nth second LED luminary is the negative electrode of the second LED lighting circuit, the negative electrode of the kth second luminary is connected to the positive electrode of the k +1 th second LED luminary, n is an integer greater than or equal to 2, the first LED luminous body and the second LED luminous body are the same in specification and model.
As shown in fig. 3, in this embodiment, the rectifier circuit is implemented by using a full-bridge rectifier circuit Db, two ac input pins of the full-bridge rectifier circuit Db are respectively a live wire input terminal and a zero line input terminal of the rectifier circuit, a positive voltage output pin of the full-bridge rectifier circuit Db is an output terminal of the rectifier circuit, and a negative voltage output pin of the full-bridge rectifier circuit Db is a ground terminal of the rectifier circuit.
Claims (5)
1. A linear constant current LED lamp circuit working under wide voltage comprises a rectifying circuit, a first LED light-emitting circuit, a second LED light-emitting circuit and two sections of linear constant current circuits, wherein the rectifying circuit is provided with a live wire input end, a zero wire input end, an output end and a grounding end, the first LED light-emitting circuit and the second LED light-emitting circuit are respectively provided with a positive electrode and a negative electrode, the two sections of linear constant current circuits are provided with a first output end, a second output end and a negative electrode, the maximum conduction current value of the first output end and the maximum conduction current value of the second output end of the two sections of linear constant current circuits are arranged in the two sections of linear constant current circuits, the maximum conduction current value of the second output end of the two sections of linear constant current circuits is larger than or equal to the maximum conduction current value of the first output end of the two sections of linear constant current circuits, when the current flowing in the second output end of, the current flowing into the first output end of the two linear constant current circuits is zero, when the current flowing into the second output end of the two linear constant current circuits is smaller than the maximum conduction current value of the first output end, the maximum current flowing into the first output end of the two linear constant current circuits is equal to the difference value of the maximum conduction current value of the first output end minus the current flowing into the second output end of the two linear constant current circuits, the conduction voltages of the first LED light-emitting circuit and the second LED light-emitting circuit are equal, the output end of the rectifying circuit is connected with the anode of the first LED light-emitting circuit, the cathode of the first LED light-emitting circuit is connected with the first output ends of the two linear constant current circuits, the cathode of the second LED light-emitting circuit is connected with the second output ends of the two linear constant current circuits, and the cathodes of the two linear constant current circuits are connected with the grounding end of the rectifying circuit, the linear constant current LED lamp circuit is characterized by further comprising a one-way conduction circuit and a controllable linear constant current circuit, wherein the one-way conduction circuit is provided with a positive electrode and a negative electrode, when the voltage of the positive electrode of the one-way conduction circuit is larger than or equal to the voltage of the negative electrode of the one-way conduction circuit, the positive electrode and the negative electrode of the one-way conduction circuit are conducted, when the voltage of the positive electrode of the one-way conduction circuit is smaller than the voltage of the negative electrode of the one-way conduction circuit, the positive electrode and the negative electrode of the one-way conduction circuit are cut off, the controllable linear constant current circuit is provided with an output end, a negative electrode and a control end, the maximum conduction current value of the output end of the controllable linear constant current circuit is preset in the controllable linear constant current circuit, the maximum conduction current value of the output end of the controllable linear constant current circuit is half of the maximum conduction current value of the first output end of the, the output end and the negative electrode of the controllable linear constant current circuit are connected, when the current flowing into the control end of the controllable linear constant current circuit is larger than or equal to the maximum conduction current value of the output end, the output end and the negative electrode of the controllable linear constant current circuit are cut off, when the current flowing into the control end of the controllable linear constant current circuit is larger than 0 and smaller than the maximum conduction current value of the output end, the maximum conduction current between the output end and the negative electrode of the controllable linear constant current circuit is equal to the difference value of the maximum conduction current value of the output end minus the current currently accessed by the control end of the controllable linear constant current circuit, the output end of the controllable linear constant current circuit is connected with the positive electrode of the first LED light-emitting circuit, the positive electrode of the unidirectional conduction circuit is connected with the negative electrode of the first LED light-emitting circuit, the negative electrode of the unidirectional conduction circuit is connected with the control end of the controllable linear constant current circuit, and, when the live wire input end and the zero line input end of the rectifying circuit are connected with commercial power, the rectifying circuit converts commercial power alternating-current voltage into direct-current voltage to be output between the output end and the grounding end, at the moment, if the direct-current voltage output by the rectifying circuit is more than or equal to the sum of the conducting voltages of the first LED light-emitting circuit and the second LED light-emitting circuit, the anode and the cathode of the one-way conducting circuit are conducted, the current flowing through the first LED light-emitting circuit, the one-way conducting circuit and the second LED light-emitting circuit is equal to the maximum conducting current value set by the second output end of the two linear constant current circuits, at the moment, the first LED light-emitting circuit and the second LED light-emitting circuit both emit light, and the current flowing into the output end of the controllable linear constant current circuit and the first output end of the two linear constant current circuits is zero, if the direct current voltage output by the rectifying circuit is smaller than the sum of the conduction voltages of the first LED light-emitting circuit and the second LED light-emitting circuit, the direct current voltage output by the rectifying circuit cannot enable the first LED light-emitting circuit and the second LED light-emitting circuit to be simultaneously conducted, the current flowing through the one-way conduction circuit is zero, the anode and the cathode of the one-way conduction circuit are cut off, the current flowing between the output end and the cathode of the controllable linear constant current circuit is the maximum conduction current value set by the output end of the controllable linear constant current circuit, the current flowing through the second LED light-emitting circuit and the current flowing into the second output end of the two linear constant current circuits are the maximum conduction current value set by the output end of the controllable linear constant current circuit, and the current flowing into the first output end of the two linear constant current circuits is the maximum conduction current value set by the first output end of the two linear constant current circuits When the direct current voltage output by the rectifying circuit is less than the conduction voltage of the first LED light-emitting circuit, the first LED light-emitting circuit and the second LED light-emitting circuit do not emit light; the two linear constant current circuits comprise a second integrated circuit chip and a second resistor, the model of the second integrated circuit chip is SM2086, the 8 th pin of the second integrated circuit chip is the first output end of the two linear constant current circuits, the 5 th pin of the second integrated circuit chip is the second output end of the two linear constant current circuits, the 1 st pin of the second integrated circuit chip is connected with one end of the second resistor, the other end of the second resistor is connected with the 4 th pin of the second integrated circuit chip, and the connecting end of the second resistor is the negative electrode of the two linear constant current circuits.
2. The linear constant-current LED lamp circuit working at wide voltage according to claim 1, characterized in that the controllable linear constant-current circuit comprises a first integrated circuit chip and a first resistor, the first integrated circuit chip is realized by a universal three-terminal linear constant-current chip with model number SM2082, the 1 st pin of the first integrated circuit chip is the output end of the controllable linear constant-current circuit, the 3 rd pin of the first integrated circuit chip is connected with one end of the first resistor, the connection end of the first integrated circuit chip is the control end of the controllable linear constant-current circuit, the 2 nd pin of the first integrated circuit chip is connected with the other end of the first resistor, and the connection end of the first integrated circuit chip is the negative electrode of the controllable linear constant-current circuit.
3. The linear constant-current LED lamp circuit working at wide voltage according to claim 1, characterized in that the unidirectional conduction circuit is realized by adopting a rectifier diode, the anode of the rectifier diode is the anode of the unidirectional conduction circuit, and the cathode of the rectifier diode is the cathode of the unidirectional conduction circuit.
4. The linear constant current LED lamp circuit operated under wide voltage range according to claim 1, wherein the first LED lighting circuit is formed by connecting n first LED lighting bodies in series, the positive electrode of the 1 st first LED lighting body is the positive electrode of the first LED lighting circuit, the negative electrode of the nth first LED lighting body is the negative electrode of the first LED lighting circuit, the negative electrode of the kth first LED lighting body is connected with the positive electrode of the k +1 th first LED lighting body, k is 1, 2, …, n-1, the second LED lighting circuit is formed by connecting n second LED lighting bodies in series, the positive electrode of the 1 st second LED lighting body is the positive electrode of the second LED lighting circuit, the negative electrode of the nth second LED lighting body is the negative electrode of the second LED lighting circuit, the negative electrode of the kth second LED lighting body is connected with the positive electrode of the k +1 th second LED lighting body, n is an integer more than or equal to 2, and the specification models of the first LED luminous body and the second LED luminous body are the same.
5. The linear constant-current LED lamp circuit operated under wide voltage according to claim 1, wherein the rectification circuit is implemented by a full-bridge rectification circuit, two AC input pins of the full-bridge rectification circuit are respectively a live input terminal and a zero input terminal of the rectification circuit, a positive voltage output pin of the full-bridge rectification circuit is an output terminal of the rectification circuit, and a negative voltage output pin of the full-bridge rectification circuit is a ground terminal of the rectification circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020977842.3U CN212992653U (en) | 2020-06-02 | 2020-06-02 | Linear constant-current LED lamp circuit working at wide voltage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020977842.3U CN212992653U (en) | 2020-06-02 | 2020-06-02 | Linear constant-current LED lamp circuit working at wide voltage |
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