CN108012380B - Linear wide-voltage constant-current constant-power circuit and LED lamp with same - Google Patents
Linear wide-voltage constant-current constant-power circuit and LED lamp with same Download PDFInfo
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- CN108012380B CN108012380B CN201711451989.8A CN201711451989A CN108012380B CN 108012380 B CN108012380 B CN 108012380B CN 201711451989 A CN201711451989 A CN 201711451989A CN 108012380 B CN108012380 B CN 108012380B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The invention provides a linear wide-voltage constant-current constant-power circuit and an LED lamp with the same, comprising: a rectifying circuit loop and two loads, a first constant-current tube IC1 and a second constant-current tube IC2; and a switching constant current tube IC3 is arranged, and the D3 end of the switching constant current tube IC3 is connected to the S1 end of the first constant current tube or the D1 end of the first constant current tube and is used for controlling the serial-parallel connection relation of the first component and the second component. The two loads of the invention can be serially connected with partial pressure under high-voltage input, and shunt under low-voltage input; meanwhile, the two loads are connected in series or in parallel, and are connected with at least one constant current tube or switching constant current tube which plays a role in constant current, so that the purposes of constant current and constant power of the loads under full voltage are realized, and the global universality of the loads is greatly provided.
Description
Technical Field
The invention relates to the field of LED illuminating lamp driving circuits, in particular to a linear wide-voltage constant-current constant-power circuit and an LED lamp with the same.
Background
As a high-efficiency new light source, the LED lamp has the advantages of long service life, low energy consumption, energy conservation and environmental protection, and is widely applied to illumination in various fields. The LED lamp for general household illumination is driven by a switch power supply or a resistance-capacitance power supply;
for the resistance-capacitance power supply, although the LED lamp can be driven to work under the working voltage VF value, the globalization and the universality of 110-220VAC wide voltage of the LED lamp cannot be realized.
For the switching power supply, the LED lamp can be driven to work under the working voltage VF value, the globalization and the universality of 110-220VAC wide voltage of the LED lamp can be realized through a frequency conversion technology, but the technology is complex and high in price, and the LED lamp has high production cost and needs to be improved or replaced urgently.
Disclosure of Invention
In order to solve the problems, the invention provides a linear wide-voltage constant-current constant-power circuit and an LED lamp with the same. The LED lamp can meet the power supply of 110-220VAC power supply worldwide, and automatically switch the serial-parallel state of the loads, specifically, the two loads can be serially connected and divided under high-voltage input, and the two loads can be parallelly connected and divided under low-voltage input; meanwhile, whether the two loads are connected in series or in parallel, the LED lamp is connected with at least one constant current tube or switching constant current tube which plays a role in constant current, so that the purposes of constant current and constant power of the loads under full voltage are realized, and the global universality of the LED lamp is greatly improved.
In order to achieve the technical purpose, the technical scheme of the invention is as follows: a linear wide voltage constant current constant power circuit comprising:
the input end of the rectifying circuit is connected to a power supply;
First and second loads, first and second constant current pipes IC1 and IC2;
an output end DB1 of the rectifying circuit is connected to an S2 end of the second constant-current tube IC 2; the S2 end of the second constant current tube IC2 is connected to the first load and then grounded;
the output end DB1 of the rectifying circuit is connected with the end D1 of the second load and the end D1 of the first constant-current tube IC1 in sequence;
the S1 end of the first constant flow pipe IC1 is connected to the CS2 end of the second constant flow pipe IC2 and is used for controlling the state of the second constant flow pipe IC 2;
And a switching constant current tube IC3 is arranged, and the D3 end of the switching constant current tube IC3 is connected to the S1 end of the first constant current tube or the D1 end of the first constant current tube and is used for controlling the serial-parallel connection relation of the first component and the second component.
Further, the CS1 end of the first constant-current tube IC1 is connected to the S1 end of the first constant-current tube IC1 through a first piezoresistor R4; the S1 end of the first constant flow pipe IC1 is grounded.
Further, the CS2 end of the second constant-current tube IC2 is connected to the S2 end of the second constant-current tube IC2 through a second piezoresistor R3.
Further, the S1 end of the first constant current tube IC1 is connected to the CS2 end of the second constant current tube IC2 through a guiding diode D, the positive end of the guiding diode D is connected with the S1 end of the first constant current tube IC1, and the negative end of the guiding diode D is connected with the CS2 end of the second constant current tube IC 2.
Further, an output end DB1 of the rectifying circuit is connected with a first clamping resistor R5 and a second clamping resistor R6 which are sequentially connected with each other and grounded, and is used for clamping the output voltage of the rectifying circuit to the voltage measuring range of the FB end of the switching constant-current tube IC 3; the FB end of the switching constant-current tube IC3 is connected between the first clamping resistor R5 and the second clamping resistor R6.
Further, the CS3 end of the switching constant current tube IC3 is connected to the S3 end of the switching constant current tube IC3 through a third piezoresistor R7; and an S3 end of the switching constant current tube IC3 is grounded.
Further, the rectifying circuit adopts a bridge rectifying circuit.
As a preferred embodiment of the present invention, based on the above, except that a reference voltage is set between 0V of the output voltage of the rectifying circuit and a peak voltage;
The D3 end of the switching constant current tube IC3 is connected to the S1 end of the first constant current tube, if the output voltage of the rectifying circuit is smaller than the reference voltage, the FB end of the switching constant current tube IC3 controls the switching constant current tube IC3 to be in a conducting state, the guide diode D is cut off, the output end DB1 of the rectifying circuit is a first branch consisting of a second constant current tube IC2 and a first load, and the second branch consisting of the second load, the first constant current tube IC1 and a third constant current tube IC3 is powered; if the output voltage of the rectifying circuit is greater than the reference voltage, the FB terminal of the switching constant current tube IC3 controls the switching constant current tube IC3 to be in an off state, and the steering diode D is turned on, so that the second constant current tube IC2 is turned off, and the rectifying circuit output terminal DB1, the second load, the first constant current tube IC1, the steering diode D, the second piezoresistor R3 and the first load form a loop, and at this time, the first load and the second load are connected in series.
It should be noted that, in this embodiment, when the input voltage is relatively large, the first load, the second load and the first constant current tube are connected in series to each other to perform voltage division (it should be noted that the constant current tube can perform a dynamic voltage division function, so that the load always operates at its operating voltage VF), and the first constant current tube operates at a constant current state, so that the two loads also operate at a constant current state, and the load power is the operating voltage VF multiplied by the constant current; when the input voltage is smaller, the first load and the second load are shunted in parallel, and the two constant current tubes are in a constant current state, so that the load current is a shunt current (the two constant current tubes are respectively connected in series with the load, so that the shunt current is also the constant current), the load voltage is also the working voltage VF, the load power is the working voltage VF multiplied by the shunt current, and the load power under the condition of larger input voltage is consistent with the load power under the condition of larger input voltage; or, in the two cases, according to the output voltage of the rectifying circuit, the two loads are connected in series at high voltage and in parallel at low voltage, so that the automatic series-parallel connection of the loads under full voltage is realized, and the purposes of constant current and constant power are further achieved.
As another preferred embodiment of the present invention, based on the above, except that a reference voltage is set between 0V of the output voltage of the rectifying circuit and a peak voltage;
An LED lamp comprises at least one linear wide-voltage constant-current constant-power circuit of the two embodiments, and the load is an LED lamp.
The invention has the beneficial effects that:
The LED lamp can meet the global 110-220VAC power supply, automatically switch the serial-parallel state of the loads, and particularly, the two loads can be serially connected and divided under high-voltage input and parallelly connected and divided under low-voltage input; meanwhile, the two loads are connected in series or in parallel, and are connected with at least one constant current tube or switching constant current tube which plays a role in constant current, so that the purposes of constant current and constant power of the loads under full voltage are realized, and the global universality of the loads is greatly provided.
Drawings
FIG. 1 is a schematic diagram of one embodiment of a linear wide voltage constant current constant power circuit of the present invention;
FIG. 2 is a schematic diagram of another embodiment of a linear wide voltage constant current constant power circuit of the present invention;
FIG. 3 is a diagram of the external pin configuration of the constant current tube of the present invention;
FIG. 4 is a schematic circuit diagram of the internal module of the constant current tube of the present invention;
FIG. 5 is a block diagram of the external pins of the switching constant current tube of the present invention;
FIG. 6 is a waveform diagram of the load current and voltage when the output of the rectifying circuit of the present invention is 110V;
fig. 7 is a waveform diagram of each load current voltage when the rectifying circuit of the present invention outputs 220V.
Detailed Description
The technical scheme of the present invention will be clearly and completely described below.
It should be noted that, as shown in fig. 3 and fig. 4, the constant current tube is a common knowledge as a person skilled in the art of the present invention, the inside of the constant current tube is integrated with a high voltage power device, the outside pin includes a grounding electrode S terminal, a drain electrode D terminal, and a detection CS terminal, the inside of the constant current tube is composed of an operational amplifier and a mos tube, and the gate electrode of the mos tube is connected with the operational amplifier; and the grounding electrode S is grounded, the detection CS is connected with the mos tube source electrode, and the drain electrode D is connected with the mos tube source electrode. When the CS terminal is at a low level (the current voltage is smaller than Vref in FIG. 3), the constant current tube is in a constant current state, at the moment, the D terminal of the drain is conducted to the ground, and the current of the D terminal is in a constant (constant current) state; and conversely, when the CS end is at a high level, the constant flow pipe is in a cut-off state.
As shown in fig. 5, the switching constant current tube is also a common general knowledge for those skilled in the art, and includes an S terminal, a D terminal, a CS terminal, and an FB terminal; the S end is grounded, and when the FB end is at a high level, the D-S end is in a cut-off (cut-off) state, and is turned on otherwise; when the CS terminal is at low level, the switching constant current tube is in a switching state (the state of the switching constant current tube is determined by the FB terminal), and otherwise, the switching constant current tube is in a constant current state.
Meanwhile, it should be noted that, the resistance values of the resistors in the present invention need to be set according to the design reference voltage Vref of the constant current tube and the switching constant current tube and the power of each load, so that the technician in the present invention can calculate the resistance values of each resistor according to the self load power and the reference voltage Vref by combining the circuit framework of the present invention, and the details are not described in the present invention.
As shown in fig. 1 and 2, a linear wide-voltage constant-current constant-power circuit includes:
the input end of the rectifying circuit is connected to a power supply; the power source may be a global 110V-220VAC power source. Meanwhile, the input voltage, the output voltage, and the like described below are effective values of the alternating-current voltage.
First and second loads, first and second constant current pipes IC1 and IC2;
an output end DB1 of the rectifying circuit is connected to an S2 end of the second constant-current tube IC 2; the S2 end of the second constant current tube IC2 is connected to the first load and then grounded;
the output end DB1 of the rectifying circuit is connected with the end D1 of the second load and the end D1 of the first constant-current tube IC1 in sequence;
the S1 end of the first constant flow pipe IC1 is connected to the CS2 end of the second constant flow pipe IC2 and is used for controlling the state of the second constant flow pipe IC 2;
And a switching constant current tube IC3 is arranged, and the D3 end of the switching constant current tube IC3 is connected to the S1 end of the first constant current tube or the D1 end of the first constant current tube and is used for controlling the serial-parallel connection relation of the first component and the second component.
Further, the CS1 end of the first constant-current tube IC1 is connected to the S1 end of the first constant-current tube IC1 through a first piezoresistor R4; the S1 end of the first constant flow pipe IC1 is grounded.
Further, the CS2 end of the second constant-current tube IC2 is connected to the S2 end of the second constant-current tube IC2 through a second piezoresistor R3.
Further, the S1 end of the first constant current tube IC1 is connected to the CS2 end of the second constant current tube IC2 through a guiding diode D, the positive end of the guiding diode D is connected with the S1 end of the first constant current tube IC1, and the negative end of the guiding diode D is connected with the CS2 end of the second constant current tube IC 2. When the output voltage of the rectifying circuit is higher than the reference voltage described below, the steering diode D is turned on, and the negative terminal of the steering diode D is connected to the CS2 terminal of the second constant current tube IC2, so that the voltage at the CS2 terminal is increased, and the second constant current tube IC2 can be turned off.
Further, an output end DB1 of the rectifying circuit is connected with a first clamping resistor R5 and a second clamping resistor R6 which are sequentially connected with each other and grounded, and is used for clamping the output voltage of the rectifying circuit to the voltage measuring range of the FB end of the switching constant-current tube IC 3; the FB end of the switching constant-current tube IC3 is connected between the first clamping resistor R5 and the second clamping resistor R6.
Further, the CS3 end of the switching constant current tube IC3 is connected to the S3 end of the switching constant current tube IC3 through a third piezoresistor R7; and an S3 end of the switching constant current tube IC3 is grounded.
Further, the rectifying circuit adopts a bridge rectifying circuit.
As a preferred embodiment of the present invention, based on the above, except that as shown in fig. 1, the D3 terminal of the switching constant current tube IC3 is connected to the S1 terminal of the first constant current tube; if the output voltage of the rectifying circuit is smaller than the reference voltage, the FB end of the switching constant-current tube IC3 controls the switching constant-current tube IC3 to be in a conducting state, the guide diode D is cut off, the output end DB1 of the rectifying circuit respectively supplies power to a first branch consisting of a second constant-current tube IC2 and a first load, and a second branch consisting of the second load, the first constant-current tube IC1 and a third constant-current tube IC3 is connected in parallel; if the output voltage of the rectifying circuit is greater than the reference voltage, the FB terminal of the switching constant current tube IC3 controls the switching constant current tube IC3 to be in an off state, and the steering diode D is turned on, so that the second constant current tube IC2 is turned off, and the rectifying circuit output terminal DB1, the second load, the first constant current tube IC1, the steering diode D, the second piezoresistor R3 and the first load form a loop, and at this time, the first load and the second load are connected in series.
It should be noted that, in this embodiment, when the input voltage is relatively large, the first load, the second load and the first constant current tube are connected in series to each other to perform voltage division (it should be noted that the constant current tube can perform a dynamic voltage division function, so that the load always operates at its operating voltage VF), and the first constant current tube operates at a constant current state, so that the two loads also operate at a constant current state, and the load power is the operating voltage VF multiplied by the constant current; when the input voltage is smaller, the first load and the second load are shunted in parallel, and the two constant current tubes are in a constant current state, so that the load current is a shunt current (the two constant current tubes are respectively connected in series with the load, so that the shunt current is also the constant current), the load voltage is also the working voltage VF, the load power is the working voltage VF multiplied by the shunt current, and the load power under the condition of larger input voltage is consistent with the load power under the condition of larger input voltage; or, in the two cases, according to the output voltage of the rectifying circuit, the two loads are connected in series at high voltage and in parallel at low voltage, so that the automatic series-parallel connection of the loads under full voltage is realized, and the purposes of constant current and constant power are further achieved.
As another preferred embodiment of the present invention, based on the above, except that the D3 terminal of the switching constant current tube IC3 is connected to the D1 terminal of the first constant current tube;
As shown in fig. 2, the D3 end of the switching constant-current tube IC3 is connected to the D1 end of the first constant-current tube, if the output voltage of the rectifying circuit is smaller than the reference voltage, the FB end of the switching constant-current tube IC3 and the CS control the switching constant-current tube IC3 to be in a constant-current state, the steering diode D and the first constant-current tube IC1 are turned off, the output end DB1 of the rectifying circuit is a first branch composed of the second constant-current tube IC2 and the first load, and a second branch composed of the second load and the third constant-current tube IC3 is powered, at this time, the first load and the second load are shunted in parallel; if the output voltage of the rectifying circuit is greater than the reference voltage, the FB terminal of the switching constant current tube IC3 controls the switching constant current tube IC3 to be in an off state, and the steering diode D is turned on, so that the second constant current tube IC2 is turned off, and the rectifying circuit output terminal DB1, the second load, the first constant current tube IC1, the steering diode D, the second piezoresistor R3 and the first load form a loop, and at this time, the first load and the second load are serially shunted.
It should be noted that, in this embodiment, when the input voltage is relatively large (greater than the reference voltage), the first load, the second load, and the first constant current tube IC1 are serially connected to divide the voltage (it should be noted that, the constant current tube can realize a dynamic voltage dividing function, so that the load always works at the working voltage VF thereof), and the first constant current tube IC1 is in a constant current state, so that the load voltage is the working voltage VF, the load current is a constant current, and the load power is the working voltage VF multiplied by the constant current; when the input voltage is smaller, the first load and the second load are shunted in parallel, the second constant current pipe IC2 and the switching constant current pipe IC3 are in a constant current state, so that the load voltage is working voltage VF, the load current is shunt current (the second constant current pipe and the switching constant current pipe are respectively connected in series with the load, so that the shunt current is constant current), the load power is the working voltage VF multiplied by the constant current, and the load power under the condition of larger input voltage is consistent with the load power under the condition of larger input voltage. Or, in the two cases, according to the output voltage of the rectifying circuit, the two loads are connected in series at high voltage and in parallel at low voltage, so that the automatic series-parallel connection of the loads under full voltage is realized, and the purposes of constant current and constant power are further achieved. When the input voltage is smaller, the first load and the second load are connected in parallel and split, the switching constant-current tube IC3 and the second constant-current tube IC2 are in a constant-current state, so that the two loads also work in the constant-current state, and the load power is the input voltage multiplied by the split current;
An LED lamp comprises at least one linear wide-voltage constant-current constant-power circuit of the two embodiments, and the load is an LED lamp.
It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the invention.
Claims (7)
1. A linear wide voltage constant current constant power circuit comprising:
the input end of the rectifying circuit is connected to a power supply;
First and second loads, first and second constant current pipes IC1 and IC2;
It is characterized in that the method comprises the steps of,
An output end DB1 of the rectifying circuit is connected to an S2 end of the second constant-current tube IC 2; the S2 end of the second constant current tube IC2 is connected to the first load and then grounded;
the output end DB1 of the rectifying circuit is connected with the end D1 of the second load and the end D1 of the first constant-current tube IC1 in sequence;
the S1 end of the first constant flow pipe IC1 is connected to the CS2 end of the second constant flow pipe IC2 and is used for controlling the state of the second constant flow pipe IC 2;
setting a switching constant current tube IC3, wherein the D3 end of the switching constant current tube IC3 is connected to the S1 end of the first constant current tube or the D1 end of the first constant current tube and is used for controlling the serial-parallel connection relation of the first component and the second component;
The output end DB1 of the rectifying circuit is connected with the first clamping resistor R5 and the second clamping resistor R6 in sequence and grounded, and is used for clamping the output voltage of the rectifying circuit to the voltage measuring range of the FB end of the switching constant-current tube IC 3; the FB end of the switching constant-current tube IC3 is connected between the first clamping resistor R5 and the second clamping resistor R6;
The CS3 end of the switching constant current tube IC3 is connected to the S3 end of the switching constant current tube IC3 through a third piezoresistor R7; the S3 end of the switching constant-current tube IC3 is grounded;
The S1 end of the first constant flow pipe IC1 is connected to the CS2 end of the second constant flow pipe IC2 through a guiding diode D, the positive end of the guiding diode D is connected with the S1 end of the first constant flow pipe IC1, and the negative end of the guiding diode D is connected with the CS2 end of the second constant flow pipe IC 2.
2. The linear wide-voltage constant-current constant-power circuit according to claim 1, wherein the end CS1 of the first constant-current tube IC1 is connected to the end S1 of the first constant-current tube IC1 through a first piezoresistor R4; the S1 end of the first constant flow pipe IC1 is grounded.
3. The linear wide-voltage constant-current constant-power circuit according to claim 1, wherein the end CS2 of the second constant-current tube IC2 is connected to the end S2 of the second constant-current tube IC2 through a second piezoresistor R3.
4. The linear wide-voltage constant-current constant-power circuit according to claim 1, wherein the rectifying circuit is a bridge rectifying circuit.
5. A linear wide voltage constant current constant power circuit according to any one of claims 2 to 4, wherein a reference voltage is set between 0V of the output voltage of the rectifying circuit and a peak voltage;
The D3 end of the switching constant current tube IC3 is connected to the S1 end of the first constant current tube, if the output voltage of the rectifying circuit is smaller than the reference voltage, the FB end of the switching constant current tube IC3 controls the switching constant current tube IC3 to be in a conducting state, the guide diode D is cut off, the output end DB1 of the rectifying circuit is a first branch consisting of a second constant current tube IC2 and a first load, and the second branch consisting of the second load, the first constant current tube IC1 and a third constant current tube IC3 is powered; if the output voltage of the rectifying circuit is greater than the reference voltage, the FB terminal of the switching constant current tube IC3 controls the switching constant current tube IC3 to be in an off state, and the steering diode D is turned on, so that the second constant current tube IC2 is turned off, and the rectifying circuit output terminal DB1, the second load, the first constant current tube IC1, the steering diode D, the second piezoresistor R3 and the first load form a loop, and at this time, the first load and the second load are connected in series.
6. A linear wide voltage constant current constant power circuit according to any one of claims 2 to 4, wherein a reference voltage is set between 0V of the output voltage of the rectifying circuit and a peak voltage;
The D3 end of the switching constant current tube IC3 is connected to the D1 end of the first constant current tube, if the output voltage of the rectifying circuit is smaller than the reference voltage, the FB end of the switching constant current tube IC3 and the CS control the switching constant current tube IC3 to be in a constant current state, the guide diode D and the first constant current tube IC1 are cut off, the output end DB1 of the rectifying circuit is a first branch consisting of a second constant current tube IC2 and a first load, and a second branch consisting of the second load and a third constant current tube IC3 is powered; if the output voltage of the rectifying circuit is greater than the reference voltage, the FB terminal of the switching constant current tube IC3 controls the switching constant current tube IC3 to be in an off state, and the steering diode D is turned on, so that the second constant current tube IC2 is turned off, and the rectifying circuit output terminal DB1, the second load, the first constant current tube IC1, the steering diode D, the second piezoresistor R3 and the first load form a loop, and at this time, the first load and the second load are connected in series.
7. An LED lamp comprising a linear wide voltage constant current constant power circuit as claimed in any one of claims 1 to 6, characterized in that the load is an LED lamp.
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| CN201711451989.8A CN108012380B (en) | 2017-12-27 | 2017-12-27 | Linear wide-voltage constant-current constant-power circuit and LED lamp with same |
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| CN201711451989.8A CN108012380B (en) | 2017-12-27 | 2017-12-27 | Linear wide-voltage constant-current constant-power circuit and LED lamp with same |
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| CN108012380B true CN108012380B (en) | 2024-04-19 |
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| CN108430140A (en) * | 2018-05-31 | 2018-08-21 | 东莞艾笛森光电限公司 | A kind of PWM modulation LED drive circuit with power failure memory function |
| CN109618467B (en) * | 2019-01-21 | 2024-04-23 | 苏州菲达旭微电子有限公司 | Linear LED load matching circuit under double voltages |
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