CN213244419U - LED lamp driving control circuit - Google Patents
LED lamp driving control circuit Download PDFInfo
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- CN213244419U CN213244419U CN202022198397.3U CN202022198397U CN213244419U CN 213244419 U CN213244419 U CN 213244419U CN 202022198397 U CN202022198397 U CN 202022198397U CN 213244419 U CN213244419 U CN 213244419U
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Abstract
The utility model discloses a LED lamp driving control circuit, which comprises a rectifier bridge with an input end connected with an alternating current power supply, wherein the positive pole of the output end of the rectifier bridge is respectively connected with a plurality of parallel LED branches, and the LED branches are respectively connected with the negative pole of the output end of the rectifier bridge through a linear constant current circuit; the LED branch circuit comprises a shunt constant current circuit and an AC LED lamp string connected in series with the shunt constant current circuit. The utility model adds the constant current circuit and the shunt constant current circuit in the circuit, when the input voltage rises, the parameters of the constant current circuit are adjusted to ensure that the current flowing through the LED lamp string keeps stable, thus ensuring the problem of brightness change of the LED lamp adopting the AC direct drive circuit; the situation that the current flowing through the LED changes along with the change of the voltage when the input voltage of the alternating current direct drive LED lamp changes is thoroughly solved.
Description
Technical Field
The utility model belongs to the technical field of the LED illumination, especially, relate to a LED lamps and lanterns drive control circuit.
Background
Currently, an LED light source is a semiconductor device operating at low voltage (VF ═ 3.2V) and large current (IF ═ 350mA), and a proper direct current must be provided to normally emit light. Because the power used in daily lighting is high-voltage alternating current, the alternating current must be converted into direct current and then into a direct current constant current source by a scheme of driving the power or a transformer, rectifying and constant current source, so that the LED light source can emit light.
However, no matter via the transformer + rectification or the switching power supply step-down, the system has a certain amount of loss; when the direct current LED is converted between alternating current and direct current, about 15% -30% of electric power is lost, and the system efficiency is difficult to achieve more than 90%.
Korean seoul semiconductor used AC LEDs that can be directly driven by AC to emit light in 2005, and us III-N Technology also used single-chip AC light emitting diodes (AC LEDs), and the system application scheme is greatly simplified, and the system efficiency reaches 92% or more.
Taiwan "industrial technology research institute" 2008, finished an AC LED product that could be industrially produced and had a practical application system scheme, and could be directly plugged in AC 110V AC voltage with a frequency of 60Hz or higher to make it AC light.
However, the driving current of the ac direct-drive lamp varies with the voltage, and when the ac voltage applied to the two ends of the ac direct-drive lamp increases, the current flowing through the ac direct-drive lamp increases, which leads to aggravation of heat generation of the LED, acceleration of light decay, and reduction of the service life of the ac direct-drive lamp. Therefore, an overcurrent protection circuit must be added to the ac direct drive lamp, so that when the ac voltage rises, the current flowing through the ac direct drive lamp is within the rated range.
However, as the working voltage of the alternating current direct drive lamp is alternating voltage, the current waveform of the alternating current direct drive lamp is actually pulsating direct current, when the alternating voltage rises, the current peak value and the duty ratio are increased, the effective value is increased, and the lamp becomes bright; when the alternating voltage is reduced, the current peak value and the duty ratio are reduced, the effective value is reduced, and the lamp becomes dark. Therefore, the conventional constant current circuit can only limit the peak value of the current flowing through the alternating current direct drive lamp, and the effective value of the current cannot be kept unchanged when the alternating current voltage rises.
SUMMERY OF THE UTILITY MODEL
The utility model provides a problem lie in providing a LED lamps and lanterns drive control circuit, can adjust constant current circuit's parameter, guarantee to flow through the electric current remain stable of LED light source to the assurance adopts the luminance stability of exchanging direct drive circuit LED lamps and lanterns.
The utility model discloses a realize through following technical scheme:
a LED lamp driving control circuit comprises a rectifier bridge with an input end connected with an alternating current power supply, wherein the positive electrode of the output end of the rectifier bridge is respectively connected with a plurality of LED branches which are connected in parallel, and the LED branches are respectively connected with the negative electrode of the output end of the rectifier bridge through a linear constant current circuit; the LED branch circuit comprises a shunt constant current circuit and an AC LED lamp string connected in series with the shunt constant current circuit.
The linear constant current circuit comprises an MOS tube V1, the grid electrode of the MOS tube V1 is connected with the positive electrode of the output end of the rectifier bridge through a resistor R1 and is connected with the negative electrode of the output end of the rectifier bridge through an adjustable voltage-stabilizing source U1, the source electrode of the MOS tube V8 is connected with the negative electrode of the output end of the rectifier bridge, and the drain electrode of the MOS tube V1 is connected with the positive electrode of the shunt.
The shunt constant current circuit consists of a voltage-dividing resistor, a front MOS tube and a rear MOS tube:
the drain electrode of the preposed MOS tube is connected with the source electrode of the MOS tube V1 through a first divider resistor, the grid electrode of the preposed MOS tube is connected with the positive electrode of the output end of the rectifier bridge through a second divider resistor, and the source electrode of the preposed MOS tube is connected with the negative electrode of the output end of the rectifier bridge through an AC LED lamp string;
the source electrode of the rear MOS tube is connected with the source electrode of the front MOS tube, the drain electrode of the rear MOS tube is connected with the grid electrode of the front MOS tube, and the grid electrode of the rear MOS tube is connected with the positive electrode of the output end of the rectifier bridge through a third voltage dividing resistor and connected with the negative electrode of the output end of the rectifier bridge through a fourth voltage dividing resistor.
The shunt constant current circuit comprises a first shunt circuit and a second shunt circuit; the first shunt circuit is composed of resistors R3, R4, R6 and R9 and MOS transistors V2 and V3:
the drain electrode of the MOS tube V2 is connected with the source electrode of the MOS tube V1 through a resistor R3, the grid electrode of the MOS tube V2 is connected with the positive electrode of the output end of the rectifier bridge through a resistor R4, and the source electrode of the MOS tube V2 is connected with the negative electrode of the output end of the rectifier bridge through an AC LED lamp string;
the source electrode of the MOS tube V3 is connected with the source electrode of the MOS tube V2, the drain electrode of the MOS tube V2 is connected with the grid electrode of the MOS tube V2, the grid electrode of the MOS tube V6 is connected with the positive electrode of the output end of the rectifier bridge, and the grid electrode of the MOS tube V9 is connected with the negative electrode of the output end of the rectifier bridge;
the second shunt circuit is composed of resistors R2, R5, R7 and R10 and MOS transistors V4 and V5:
the drain electrode of the MOS tube V4 is connected with the source electrode of the MOS tube V1 through a resistor R2, the grid electrode of the MOS tube V4 is connected with the positive electrode of the output end of the rectifier bridge through a resistor R5, and the source electrode of the MOS tube V4 is connected with the negative electrode of the output end of the rectifier bridge through an AC LED lamp string;
the source electrode of the MOS transistor V5 is connected with the source electrode of the MOS transistor V4, the drain electrode is connected with the grid electrode of the MOS transistor V4, the grid electrode is connected with the positive electrode of the output end of the rectifier bridge through a resistor R7, and is connected with the negative electrode of the output end of the rectifier bridge through a resistor R10.
The rectifier bridge is a bridge rectifier circuit formed by serially connecting diodes, and the output waveform of the rectifier bridge is steamed bread waves; the voltage waveforms at the two ends of the shunt constant current circuit are steamed bread waves; when the input voltage exceeds the rated value, the voltage across the AC LED maintains the rated value, and the increased voltage is applied across the linear constant current circuit.
The adjustable voltage stabilizing source U1 is TL 431.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model provides a LED lamps and lanterns drive control circuit through increase linear constant current circuit and reposition of redundant personnel constant current circuit in the circuit, can adjust according to input voltage's change: when the input voltage is increased, the parameters of the constant current circuit can be adjusted, and the current flowing through the LED light source is ensured to be stable, so that the problem of brightness change of an LED lamp adopting an alternating current direct drive circuit can be solved; the problem that when the input voltage changes, the current flowing through the LED of the alternating current direct drive LED lamp changes along with the change of the voltage is thoroughly solved.
Drawings
Fig. 1 is a schematic diagram of the circuit framework of the present invention.
Fig. 2 is a schematic diagram of the circuit connection of the present invention.
Detailed Description
The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention can be more clearly and clearly defined.
Referring to fig. 1, an LED lamp driving control circuit includes a rectifier bridge having an input end connected to an ac power supply, wherein an anode of an output end of the rectifier bridge is connected to a plurality of LED branches connected in parallel, and the LED branches are connected to a cathode of the output end of the rectifier bridge through a linear constant current circuit; the LED branch circuit comprises a shunt constant current circuit and an AC LED lamp string connected in series with the shunt constant current circuit.
Referring to fig. 2, the linear constant current circuit includes a MOS transistor V1, a gate of which is connected to an anode of an output terminal of the rectifier bridge through a resistor R1 and connected to a cathode of the output terminal of the rectifier bridge through an adjustable voltage regulator U1, a source of which is connected to a cathode of the output terminal of the rectifier bridge through a resistor R8, and a drain of which is connected to an anode of the shunt constant current circuit.
Referring to fig. 2, the shunt constant current circuit is composed of a voltage-dividing resistor, a front MOS transistor and a rear MOS transistor:
the drain electrode of the preposed MOS tube is connected with the source electrode of the MOS tube V1 through a first divider resistor, the grid electrode of the preposed MOS tube is connected with the positive electrode of the output end of the rectifier bridge through a second divider resistor, and the source electrode of the preposed MOS tube is connected with the negative electrode of the output end of the rectifier bridge through an AC LED lamp string;
the source electrode of the rear MOS tube is connected with the source electrode of the front MOS tube, the drain electrode of the rear MOS tube is connected with the grid electrode of the front MOS tube, and the grid electrode of the rear MOS tube is connected with the positive electrode of the output end of the rectifier bridge through a third voltage dividing resistor and connected with the negative electrode of the output end of the rectifier bridge through a fourth voltage dividing resistor.
Specifically, the shunt constant current circuit comprises a first shunt circuit and a second shunt circuit; the first shunt circuit is composed of resistors R3, R4, R6 and R9 and MOS transistors V2 and V3:
the drain electrode of the MOS tube V2 is connected with the source electrode of the MOS tube V1 through a resistor R3, the grid electrode of the MOS tube V2 is connected with the positive electrode of the output end of the rectifier bridge through a resistor R4, and the source electrode of the MOS tube V2 is connected with the negative electrode of the output end of the rectifier bridge through an AC LED lamp string;
the source electrode of the MOS tube V3 is connected with the source electrode of the MOS tube V2, the drain electrode of the MOS tube V2 is connected with the grid electrode of the MOS tube V2, the grid electrode of the MOS tube V6 is connected with the positive electrode of the output end of the rectifier bridge, and the grid electrode of the MOS tube V9 is connected with the negative electrode of the output end of the rectifier bridge;
the second shunt circuit is composed of resistors R2, R5, R7 and R10 and MOS transistors V4 and V5:
the drain electrode of the MOS tube V4 is connected with the source electrode of the MOS tube V1 through a resistor R2, the grid electrode of the MOS tube V4 is connected with the positive electrode of the output end of the rectifier bridge through a resistor R5, and the source electrode of the MOS tube V4 is connected with the negative electrode of the output end of the rectifier bridge through an AC LED lamp string;
the source electrode of the MOS transistor V5 is connected with the source electrode of the MOS transistor V4, the drain electrode is connected with the grid electrode of the MOS transistor V4, the grid electrode is connected with the positive electrode of the output end of the rectifier bridge through a resistor R7, and is connected with the negative electrode of the output end of the rectifier bridge through a resistor R10.
Specifically, the rectifier bridge is a bridge rectifier circuit formed by serially connecting diodes, and the output waveform of the rectifier bridge is a steamed bread wave; the voltage waveforms at the two ends of the shunt constant current circuit are steamed bread waves; when the input voltage exceeds the rated value, the voltage across the AC LED maintains the rated value, and the increased voltage is applied across the linear constant current circuit.
Specific examples are given below.
Referring to fig. 1 and 2, an LED lamp driving control circuit includes a rectifier bridge having an input end connected to an ac power supply, wherein an anode of an output end of the rectifier bridge is connected to a plurality of LED branches connected in parallel, and the LED branches are connected to a cathode of the output end of the rectifier bridge through a linear constant current circuit; the LED branch circuit comprises a shunt constant current circuit and an AC LED lamp string connected in series with the shunt constant current circuit.
The resistors R1 and R8, the MOS transistor V1 and the adjustable primary voltage reference U1 form a linear constant current circuit;
the resistors R3, R4, R6 and R9 and the MOS transistors V2 and V3 form a first shunt circuit; the resistors R2, R5, R7 and R10 and the MOS transistors V4 and V5 form a second shunt circuit.
The voltage waveforms added at the two ends of the alternating current direct drive LED lamp are 100Hz steamed bread waves, the overcurrent protection circuit is connected in series in a loop of the alternating current direct drive LED lamp, the voltage waveforms at the two ends of the overcurrent protection circuit are also 100Hz steamed bread waves, when the input voltage exceeds a rated value, the voltage at the two ends of the circuit of the alternating current direct drive LED lamp keeps 220V unchanged, the total voltage increment is set to be 45V, and the increased 45V voltage is added at the two ends of the linear constant current circuit. The incremental voltages across the two self-controlled shunt circuits are at 1/3 and 2/3 (about 15V, 30V) of the total incremental voltage, and the default operating states of both shunt circuits are in the conducting mode.
When the incremental voltage at two ends of the linear constant current circuit is below the total incremental voltage 1/3 (< 15V), V2 in the first group of automatic control shunt circuits is conducted, V3 is turned off, V4 in the second group of automatic control shunt circuits is conducted, V5 is turned off, alternating current directly drives current to flow through the constant current circuit and the two shunt circuits, and peak current is set by the linear constant current circuit and the two automatic control shunt circuits.
When the increment voltage at two ends of the linear constant current circuit is within the range of total increment voltage 1/3-2/3 (15V is less than 30V), V3 in the first group of self-control shunt circuits is conducted, V2 is turned off, V4 in the second group of self-control shunt circuits is conducted, V5 is turned off, current flows through the linear constant current circuit and the second self-control shunt circuits, and working current is set by the linear constant current circuit and the second self-control shunt circuits.
When the incremental voltage at two ends of the linear constant current circuit is larger than 2/3 (more than or equal to 30V) total incremental voltage, V3 in the first group of self-control shunt circuits is conducted, V2 is turned off, V5 in the second group of self-control shunt circuits is conducted, V4 is turned off, current only flows through the linear constant current circuit, and working current is set by the linear constant current circuit.
The peak current limiting point in the overcurrent protection circuit is jointly determined by a current detection resistor R8 in the linear constant current circuit and resistors R2 and R3 in the two shunt circuits, and the calculation formula of the current limiting point is as follows:
in the formula: IDS is the peak current limiting point; vref is the reference voltage of U1(TL 431).
From the above formula, by changing the resistance values of R8, R2, R3, the peak current limiting value can be accurately set. When the input voltage is higher than the rated voltage, the overcurrent protection circuit reduces the current flowing through the LED through the plurality of self-control shunt circuits, avoids the damage of the LED lamp due to the flowing of large current under the action of the AC direct power supply voltage, and greatly improves the reliability and the service life of the AC direct drive LED lamp.
The utility model discloses an increase linear constant current circuit and reposition of redundant personnel constant current circuit in the circuit, can adjust according to input voltage's change: when the input voltage is increased, the parameters of the constant current circuit can be adjusted, and the current flowing through the LED light source is ensured to be stable, so that the problem of brightness change of an LED lamp adopting an alternating current direct drive circuit can be solved; the problem that when the input voltage changes, the current flowing through the LED of the alternating current direct drive LED lamp changes along with the change of the voltage is thoroughly solved.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment, but all equivalent modifications or changes made by those skilled in the art according to the present invention should be included in the protection scope of the claims.
Claims (6)
1. A LED lamp driving control circuit is characterized by comprising a rectifier bridge with an input end connected with an alternating current power supply, wherein the positive electrode of the output end of the rectifier bridge is respectively connected with a plurality of LED branches which are connected in parallel, and the LED branches are respectively connected with the negative electrode of the output end of the rectifier bridge through a linear constant current circuit; the LED branch circuit comprises a shunt constant current circuit and an AC LED lamp string connected in series with the shunt constant current circuit.
2. The LED lamp driving control circuit according to claim 1, wherein the linear constant current circuit comprises a MOS transistor V1, the gate of which is connected to the positive pole of the output terminal of the rectifier bridge via a resistor R1 and to the negative pole of the output terminal of the rectifier bridge via an adjustable voltage regulator U1, the source of which is connected to the negative pole of the output terminal of the rectifier bridge via a resistor R8, and the drain of which is connected to the positive pole of the shunt constant current circuit.
3. The LED lamp driving control circuit according to claim 1 or 2, wherein the shunt constant current circuit is composed of a shunt resistor, a pre-MOS transistor and a post-MOS transistor:
the drain electrode of the preposed MOS tube is connected with the source electrode of the MOS tube V1 through a first divider resistor, the grid electrode of the preposed MOS tube is connected with the positive electrode of the output end of the rectifier bridge through a second divider resistor, and the source electrode of the preposed MOS tube is connected with the negative electrode of the output end of the rectifier bridge through an AC LED lamp string;
the source electrode of the rear MOS tube is connected with the source electrode of the front MOS tube, the drain electrode of the rear MOS tube is connected with the grid electrode of the front MOS tube, and the grid electrode of the rear MOS tube is connected with the positive electrode of the output end of the rectifier bridge through a third voltage dividing resistor and connected with the negative electrode of the output end of the rectifier bridge through a fourth voltage dividing resistor.
4. The LED lamp driving control circuit according to claim 3, wherein the shunt constant current circuit includes a first shunt circuit and a second shunt circuit; the first shunt circuit is composed of resistors R3, R4, R6 and R9 and MOS transistors V2 and V3:
the drain electrode of the MOS tube V2 is connected with the source electrode of the MOS tube V1 through a resistor R3, the grid electrode of the MOS tube V2 is connected with the positive electrode of the output end of the rectifier bridge through a resistor R4, and the source electrode of the MOS tube V2 is connected with the negative electrode of the output end of the rectifier bridge through an AC LED lamp string;
the source electrode of the MOS tube V3 is connected with the source electrode of the MOS tube V2, the drain electrode of the MOS tube V2 is connected with the grid electrode of the MOS tube V2, the grid electrode of the MOS tube V6 is connected with the positive electrode of the output end of the rectifier bridge, and the grid electrode of the MOS tube V9 is connected with the negative electrode of the output end of the rectifier bridge;
the second shunt circuit is composed of resistors R2, R5, R7 and R10 and MOS transistors V4 and V5:
the drain electrode of the MOS tube V4 is connected with the source electrode of the MOS tube V1 through a resistor R2, the grid electrode of the MOS tube V4 is connected with the positive electrode of the output end of the rectifier bridge through a resistor R5, and the source electrode of the MOS tube V4 is connected with the negative electrode of the output end of the rectifier bridge through an AC LED lamp string;
the source electrode of the MOS transistor V5 is connected with the source electrode of the MOS transistor V4, the drain electrode is connected with the grid electrode of the MOS transistor V4, the grid electrode is connected with the positive electrode of the output end of the rectifier bridge through a resistor R7, and is connected with the negative electrode of the output end of the rectifier bridge through a resistor R10.
5. The LED lamp driving control circuit according to claim 1, wherein the rectifier bridge is a bridge rectifier circuit formed by diodes connected in series, and the output waveform thereof is a steamed bread wave; the voltage waveforms at the two ends of the shunt constant current circuit are steamed bread waves; when the input voltage exceeds the rated value, the voltage across the AC LED maintains the rated value, and the increased voltage is applied across the linear constant current circuit.
6. The LED lamp driver control circuit of claim 2 wherein the regulated voltage source U1 is TL 431.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022198397.3U CN213244419U (en) | 2020-09-29 | 2020-09-29 | LED lamp driving control circuit |
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| CN202022198397.3U CN213244419U (en) | 2020-09-29 | 2020-09-29 | LED lamp driving control circuit |
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| CN213244419U true CN213244419U (en) | 2021-05-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023051698A1 (en) * | 2021-09-29 | 2023-04-06 | 嘉兴山蒲照明电器有限公司 | Led filament and bulb lamp applying same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023051698A1 (en) * | 2021-09-29 | 2023-04-06 | 嘉兴山蒲照明电器有限公司 | Led filament and bulb lamp applying same |
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