CN109640461B - LED driving circuit and lighting lamp - Google Patents
LED driving circuit and lighting lamp Download PDFInfo
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- CN109640461B CN109640461B CN201910125430.9A CN201910125430A CN109640461B CN 109640461 B CN109640461 B CN 109640461B CN 201910125430 A CN201910125430 A CN 201910125430A CN 109640461 B CN109640461 B CN 109640461B
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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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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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Abstract
The invention relates to an LED driving circuit and an illuminating lamp, wherein the LED driving circuit comprises a boosting and stabilizing module and a constant current driving module; the LED lamp comprises a boosting and voltage stabilizing module, a first input end of the boosting and voltage stabilizing module is used for being connected with a first power supply, an output end of the boosting and voltage stabilizing module is used for being connected with an anode of an LED lamp, a first end of the constant current driving module is used for being connected with a cathode of the LED lamp, a second end of the constant current driving module is used for being connected with a second power supply, the boosting and voltage stabilizing module boosts the power supply into rated voltage of the LED lamp, stable direct current is output, ripple voltage in the power supply is filtered, stable direct current voltage is provided for the LED lamp, and current is constant when the LED lamp works through the arrangement of the constant current driving module, so that current or voltage jump when the LED lamp works can be reduced through the arrangement of the boosting and voltage stabilizing module and the constant current driving module, and no stroboscopic lighting of the LED lamp can be realized.
Description
Technical Field
The invention relates to the technical field of LED driving, in particular to an LED driving circuit and an illuminating lamp.
Background
The LED (Light-Emitting Diode) lighting lamp is a green and efficient Light source with long service life, no pollution, high luminous efficiency, etc., and is widely used in the lighting field. The LED illuminating lamp can work normally only by using a proper direct-current LED driving power supply, but because the traditional LED driving power supply is used for lighting the LED illuminating lamp, a serious stroboscopic phenomenon exists, visual fatigue of a user is easy to cause, the damage to eyes of the user is large, the user experience is affected, and the user requirement cannot be met.
Disclosure of Invention
Based on the above, aiming at the phenomenon that the traditional LED driving power supply drives the LED lamp to have serious stroboscopic effect, the LED driving circuit and the illuminating lamp are provided.
An LED driving circuit comprises a boosting and voltage stabilizing module and a constant current driving module; the first input end of the boosting and voltage stabilizing module is used for being connected with a first power supply, the output end of the boosting and voltage stabilizing module is used for being connected with an anode of the LED lamp, the first end of the constant current driving module is used for being connected with a cathode of the LED lamp, and the second end of the constant current driving module is used for being connected with a second power supply.
In one embodiment, the voltage boosting and stabilizing module includes a transformer T2, a voltage boosting and stabilizing chip U3 and a field effect transistor Q5, where the transformer T2 includes a primary winding and a secondary winding, the primary winding is coupled with the secondary winding, a first end of the primary winding is used to connect to a first power supply, a second end of the primary winding is used to connect to an anode of the LED lamp, the secondary winding is connected to a first input end of the voltage boosting and stabilizing chip U3, a first output end of the voltage boosting and stabilizing chip U3 is connected to a gate of the field effect transistor Q5, a second output end of the voltage boosting and stabilizing chip U3 is connected to a source of the field effect transistor Q5, and a drain of the field effect transistor Q5 is connected to a second end of the primary winding.
In one embodiment, the constant current driving module includes a resistor R1, a capacitor C1, and a constant current chip U4, where a first end of the constant current chip U4 is used to connect to a cathode of the LED lamp, a second end of the constant current chip U4 is used to connect to a second power supply, a third end of the constant current chip U4 is used to connect to a third power supply through the resistor R1, and a second end of the constant current chip U4 is connected to the third end of the constant current chip U4 through the capacitor C1.
In one embodiment, the LED driving circuit further includes a control module and a first switch module, wherein an output end of the control module is connected with a control end of the first switch module, a first end of the first switch module is used for grounding, and a second end of the first switch module is connected with a third end of the constant current driving module.
In one embodiment, the constant current driving circuit comprises a first constant current driving sub-module and a second constant current driving sub-module, the LED lamp comprises a first LED lamp and a second LED lamp, the first switch module comprises a first control switch and a second control switch, the output end of the voltage boosting and stabilizing module is used for being connected with the anode of the first LED lamp and the anode of the second LED lamp respectively, the first end of the first constant current driving sub-module is used for being connected with the cathode of the first LED lamp, the second end of the first constant current driving sub-module is used for being connected with a second power supply, the third end of the first constant current driving sub-module is connected with the second end of the first control switch, the first end of the first control switch is used for being grounded, the control end of the first control switch is connected with the first output end of the control module, the first end of the second constant current driving sub-module is used for being connected with the cathode of the second LED lamp, the second end of the second constant current driving sub-module is used for being connected with the second end of the second control switch, and the second end of the second constant current driving sub-module is connected with the second end of the second control switch.
In one embodiment, the LED driving circuit further includes an infrared receiver, and the infrared receiver is connected to the input end of the control module.
In one embodiment, the LED driving circuit further includes a voltage transformation module, an input end of the voltage transformation module is used for being connected with the first power supply, and an output end of the voltage transformation module is connected with a power end of the control module.
In one embodiment, the LED driving circuit includes an auxiliary control module, an output end of the control module is further connected to a first input end of the auxiliary control module, a second input end of the auxiliary control module is used for being connected to a fourth power supply, and an output end of the auxiliary control module is connected to a second input end of the boost voltage stabilizing module.
In one embodiment, the LED driving circuit further includes a second switch module, a control end of the second switch module is connected to an output end of the auxiliary control module, a first end of the second switch module is used for connecting a cathode of the LED lamp, and a second end of the switch module is connected to a first end of the constant current driving module.
An illumination lamp, comprising: the LED lamp and the LED driving circuit in any of the foregoing embodiments, wherein a first input end of the boost voltage stabilizing module is used for connecting a power supply, an output end of the boost voltage stabilizing module is connected with an anode of the LED lamp, a cathode of the LED lamp is connected with a first end of the constant current driving module, and a second end of the constant current driving module is used for connecting a second power supply.
Above-mentioned LED drive circuit and light, the steady voltage module that steps up into LED lamp rated voltage with the power to with ripple voltage filtering in the power, provide stable direct current voltage for the LED lamp, make the electric current of LED lamp during operation invariable through setting up constant current drive module, consequently, through setting up the steady voltage module and constant current drive module that step up, can reduce the jump of electric current or voltage during operation of LED lamp, can realize that the LED lamp does not have stroboscopic and shiny.
Drawings
FIG. 1 is a block diagram of an LED driver circuit in one embodiment;
FIG. 2 is a block diagram of an LED driver circuit in another embodiment;
FIG. 3 is a block diagram of an LED driver circuit in yet another embodiment;
FIG. 4 is a schematic circuit diagram of a constant current drive module in one embodiment;
FIG. 5 is a schematic circuit diagram of a boost regulator module and an auxiliary control module in one embodiment;
FIG. 6 is a schematic circuit diagram of a control module in one embodiment;
FIG. 7 is a schematic circuit diagram of a transformer module in one embodiment;
FIG. 8 is a schematic circuit diagram of a rectifier filter module in one embodiment;
Fig. 9 is a block diagram of the structure of the illumination lamp in one embodiment.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
For example, an LED driving circuit includes a boost voltage stabilizing module and a constant current driving module; the first input end of the boosting and voltage stabilizing module is used for being connected with a first power supply, the output end of the boosting and voltage stabilizing module is used for being connected with an anode of the LED lamp, the first end of the constant current driving module is used for being connected with a cathode of the LED lamp, and the second end of the constant current driving module is used for being connected with a second power supply.
According to the LED driving circuit, the boosting and voltage stabilizing module boosts the power supply into the rated voltage of the LED lamp, outputs stable direct current, filters ripple voltage in the power supply, provides stable direct current voltage for the LED lamp, and enables the current of the LED lamp during operation to be constant by arranging the constant current driving module, so that current or voltage jump during operation of the LED lamp can be reduced by arranging the boosting and voltage stabilizing module and the constant current driving module, and no stroboscopic lighting of the LED lamp can be realized.
In one embodiment, referring to fig. 1, an LED driving circuit 10 includes a boost voltage stabilizing module 100 and a constant current driving module 200; the first input end of the boost voltage stabilizing module 100 is used for being connected with the first power supply 120, the output end of the boost voltage stabilizing module 100 is used for being connected with an anode of an LED lamp, the first end of the constant current driving module 200 is used for being connected with a cathode of the LED lamp, and the second end of the constant current driving module 200 is used for being connected with the second power supply 130. The boost voltage stabilizing module 100 is used for boosting a power supply for the LED lamp and providing a stable direct current voltage for the LED lamp, and the constant current driving module is used for enabling the current flowing through the LED lamp to be constant. In one embodiment, the first power supply is a dc power supply, and in one embodiment, the second power supply is a ground, and the second end of the constant current driving module is used for being connected to the second power supply, that is, the second end of the constant current driving module is used for being grounded. In one embodiment, the second power source is a negative electrode of a power source and the first power source is a positive electrode of the power source.
Above-mentioned LED drive circuit, the steady voltage module that steps up into LED lamp rated voltage with the power, output stable direct current to with the ripple voltage filtering in the power, provide stable direct current voltage for the LED lamp, make the electric current of LED lamp during operation invariable through setting up constant current drive module, consequently, through setting up the jump of voltage module and constant current drive module that steps up, can reduce the electric current or the voltage of LED lamp during operation, can realize that the LED lamp does not have the stroboscopic and shines, and can realize that the reactive power of LED lamp reduces, realize that high power factor drives the LED lamp and shines.
In order to make the boost voltage stabilizing module output stable direct current, in one embodiment, referring to fig. 4 and 5, the boost voltage stabilizing module 100 includes a transformer T2, a boost voltage stabilizing chip U3, and a field effect transistor Q5, where the transformer T2 includes a primary winding and a secondary winding, the primary winding is coupled to the secondary winding, a first end of the primary winding is used for connecting a first power supply, a second end of the primary winding is used for connecting an anode of the LED lamp, the secondary winding is connected to a first input end of the boost voltage stabilizing chip U3, a first output end of the boost voltage stabilizing chip U3 is connected to a gate of the field effect transistor Q5, a second output end of the boost voltage stabilizing chip U3 is connected to a source of the field effect transistor Q5, and a drain of the field effect transistor Q5 is connected to a second end of the primary winding. The voltage of the primary winding of the transformer is regulated through the boosting and voltage stabilizing chip U3 and the field effect transistor Q5, so that the voltage of the first power supply is boosted to the rated voltage of the LED lamp, stable voltage is provided for the LED lamp, the ripple voltage of the first power supply is filtered, the jump of the voltage of the LED lamp during working is reduced, and the LED stroboscopic phenomenon is reduced.
In order to provide a constant current for an LED lamp and reduce a stroboscopic phenomenon of the LED, in one embodiment, referring to fig. 4, the constant current driving module includes a resistor R1, a capacitor C1, and a constant current chip U4, a first end of the constant current chip U4 is used for connecting with a cathode of the LED lamp, a second end of the constant current chip U4 is used for connecting with a second power supply, a third end of the constant current chip U4 is used for connecting with a third power supply through the resistor R1, and a second end of the constant current chip U4 is connected with a third end of the constant current chip U4 through the capacitor C1. In this embodiment, the second power supply is ground, that is, the second end of the constant current chip U4 is used for grounding. In one embodiment, the third power source is a 5V dc power source. Through setting up constant current chip U4 for the electric current in the return circuit is invariable, and the operating current of LED lamp is invariable promptly, and the jump of the electric current of less LED lamp during operation reduces LED stroboscopic phenomenon.
In order to facilitate the user to control the on/off of the LED lamp, referring to fig. 2, in one embodiment, the LED driving circuit 10 further includes a control module 300 and a first switch module 400, wherein an output end of the control module 300 is connected to a control end of the first switch module 400, a first end of the first switch module 400 is used for being grounded, and a second end of the first switch module 400 is connected to a third end of the constant current driving module 200. Specifically, the second end of the first switch module is connected to the third end of the constant current chip U4, in one embodiment, the first switch module includes a field effect transistor Q1, the output end of the control module is connected to the gate of the field effect transistor Q1, the source of the field effect transistor Q1 is used for grounding, and the drain of the field effect transistor Q1 is connected to the third end of the constant current chip U4. In one embodiment, the first switch includes a MOS (metal-oxide-semiconductor) transistor Q1. In one embodiment, the control module comprises a single chip microcomputer, by setting such control module and the first switch module, the user sends out corresponding control signals by controlling the control module, and the first switch module controls the first end and the second end of the first switch module to be turned on or off according to the received control signals, so that the LED lamp is turned on or off, and the user is convenient to control the on or off of the LED lamp.
Specifically, the control signal is a PWM (Pulse Width Modulation ) signal.
In order to enable the LED driving circuit to realize the adjustment of the color temperature, in one embodiment, please refer to fig. 3 and 4, the constant current driving module includes a first constant current driving sub-module 210 and a second constant current driving sub-module 220, the LED lamp includes a first LED lamp and a second LED lamp, the first LED lamp is LED1 in the figure, the second LED lamp is LED2 in the figure, the first switching module includes a first control switch 410 and a second control switch 420, the output end of the voltage boosting and stabilizing module 100 is connected with the anode of the first LED lamp and the anode of the second LED lamp, the first end of the first constant current driving sub-module 210 is connected with the cathode of the first LED lamp, the second end of the first constant current driving sub-module 210 is connected with the second end of the first control switch 410, the first end of the first control switch 410 is connected with the second end of the first control switch 300 is connected with the second end of the second constant current driving sub-module 220, and the second end of the second constant current driving sub-module is connected with the second end of the second control switch 220. In one embodiment, the first constant current driving sub-module 210 includes a resistor R1, a capacitor C1 and a constant current chip U4, a first end of the constant current chip U4 is used for being connected with a cathode of the first LED lamp, a second end of the constant current chip U4 is used for being connected with a second power supply, the third end of the constant current chip U4 is used for being connected with a third power supply through the resistor R1, the second end of the constant current chip U4 is connected with the third end of the constant current chip U4 through the capacitor C1, the third end of the constant current chip U4 is also connected with the second end of the first control switch, in one embodiment, the second constant current driving sub-module 220 includes a resistor R2, a capacitor C2 and a constant current chip U5, a first end of the constant current chip U5 is used for being connected with a cathode of the second LED lamp, a second end of the constant current chip U5 is used for being connected with a second power supply, the third end of the constant current chip U5 is used for being connected with a third power supply through the resistor R2, the second end of the constant current chip U5 is connected with the third end of the constant current chip U5 through the capacitor C2, the third end of the constant current chip U5 is also connected with the second end of the second control switch, in one embodiment, the first control switch comprises a field effect transistor Q1, the second control switch comprises a field effect transistor Q2, the grid electrode of the field effect tube Q1 is connected with the first output end of the control module, the source electrode of the field effect tube Q1 is used for grounding, the drain electrode of the field effect transistor Q1 is connected with the third end of the constant current chip U4, the grid electrode of the field effect transistor Q2 is connected with the second output end of the control module, the source electrode of the field effect transistor Q2 is used for being grounded, and the drain electrode of the field effect transistor Q2 is connected with the third end of the constant current chip U5. In one embodiment, the first control switch includes a MOS transistor Q1, and the second control switch includes a MOS transistor Q2. In one embodiment, the color temperatures of the first LED lamp and the second LED lamp outputs are different. Therefore, the first control switch and the second control switch are controlled to be turned on or off through the control module so as to respectively control the first constant current driving sub-module to drive the first LED lamp to be turned on or off and the second constant current driving sub-module to drive the second LED lamp to be turned on or off, and then the first LED lamp and the second LED lamp with different color temperatures can be controlled to be turned on or off through the control module according to the requirements of users so as to realize the adjustment of the color temperature.
In order to facilitate the user to control the LED lamp to turn on or off, in one embodiment, referring to fig. 6, the LED driving circuit further includes an infrared receiver 640, and the infrared receiver 640 is connected to the input terminal of the control module 300. Through setting up infrared receiver, then the user makes control module output corresponding control signal through the infrared remote controller of remote control to the user control LED lamp lights up or goes out, and lights up or goes out through first LED lamp and second LED lamp of infrared remote controller control, thereby the colour temperature of the user-friendly LED lamp of being convenient for adjusts.
In order to facilitate power supply to the control module, in one embodiment, referring to fig. 2, the LED driving circuit 10 further includes a voltage transformation module 700, an input end of the voltage transformation module 700 is used for being connected to a first power supply, an output end of the voltage transformation module 700 is connected to a power supply end of the control module 300, a dc voltage of the first power supply is reduced by the voltage transformation module and is converted into a low-voltage dc power for the control module to supply power, so that the power of the control module comes from the first power supply, no additional power supply is needed, thereby facilitating power supply to the control module, and in one embodiment, the low-voltage dc power is 16V.
In order to better provide the voltage stabilizing module with the voltage stabilizing module, in one embodiment, please refer to fig. 7 and 8, the LED driving circuit further includes a filter module 710, an input end of the filter module 710 is used for being connected to a first power supply, an output end of the filter module 710 is connected to an input end of the voltage stabilizing module 700, in one embodiment, the filter module includes a diode D4, a capacitor EC1, a capacitor EC2, and an inductor L2, an anode of the diode D4 is used for being connected to the first power supply, a cathode of the diode D4 is connected to an input end of the voltage stabilizing module through the inductor L2, a first end of the inductor L2 is used for being grounded through the capacitor EC1, a second end of the inductor L2 is used for being grounded through the capacitor EC2, in one embodiment, both the capacitor EC1 and the capacitor EC2 are aluminum capacitors, an anode of the capacitor EC1 is connected to a first end of the inductor L7 of the three-level transistor EC2, a cathode of the capacitor EC1 is used for being grounded, and a cathode of the capacitor EC2 is connected to an anode of the capacitor EC2 is used for being grounded to an input end of the filter module, and an output end of the filter module is connected to the anode of the capacitor EC 2. Through setting up such low pass filter module to make the transformation module better convert first power into low voltage direct current, thereby make the transformation module better provide stable voltage for control module.
In order to reduce the idle standby power consumption of the LED driving circuit, referring to fig. 2 and 5, in one embodiment, the LED driving circuit 10 includes an auxiliary control module 500, an output end of the control module 300 is further connected to a first input end of the auxiliary control module 500, a second input end of the auxiliary control module 500 is used to connect to a fourth power supply, and an output end of the auxiliary control module 500 is connected to a second input end of the boost voltage stabilizing module 100. Specifically, the output end of the auxiliary control module is connected with the second input end of the boost voltage stabilizing chip U3, that is, the output end of the auxiliary control module is connected with the VDD pin of the boost voltage stabilizing chip U3, in one embodiment, the fourth power supply is a direct current power supply, the fourth power supply is a 16V direct current power supply, and when the LED lamp does not work or is standby, that is, when the control module controls the first end and the second end of the first switch module to be disconnected, the control module sends a corresponding control signal to the auxiliary control module, so that the auxiliary control module disconnects the second input end of the boost voltage stabilizing module from the power supply, and the boost voltage stabilizing module does not work, thereby reducing idle standby power consumption and electric energy loss of the LED in a standby state, and when a user needs to light the LED lamp, the control module sends a corresponding control signal to enable the second end of the auxiliary control module to be connected with the boost voltage stabilizing module in a normal power supply state, so that the boost voltage stabilizing module can work normally. Specifically, by setting such an auxiliary control module, the idle standby power consumption can be reduced to 0.5W.
In order to better disconnect the second input end of the boost voltage stabilizing module from the power supply, in one embodiment, referring to fig. 4 to 6, the auxiliary power supply module includes a field effect transistor Q6, a triode Q7, and a resistor R57, where a gate of the field effect transistor Q6 is connected to an output end of the control module, a source of the field effect transistor Q6 is used for grounding, a drain of the field effect transistor Q6 is connected to a base of the triode Q7, a base of the triode Q7 is also connected to a collector of the triode Q7 through the resistor R57, a collector of the triode Q7 is also used for connecting to a fourth power supply, and an emitter of the triode Q7 is connected to the second input end of the boost voltage stabilizing module. Through setting up such auxiliary control module, when control module control first switch module first end and second end disconnection, control field effect transistor Q6's drain electrode and source electrode disconnection to make the fourth power can't give the voltage stabilizing module that steps up through the triode, thereby realize auxiliary control module with the second input and the power disconnection of voltage stabilizing module that steps up.
In one embodiment, the first output end and the second output end of the control module are both connected with the first input end of the auxiliary power supply module, that is, the first output end and the second output end of the control module are both connected with the output end of the field effect tube Q6.
In order to make the voltage-boosting and voltage-stabilizing module need not to be additionally connected with a power supply and optimize a circuit, in one embodiment, referring to fig. 2 and 5, the output end of the voltage-boosting and voltage-stabilizing module 700 is further connected with the second input end of the auxiliary control module 500, specifically, the output end of the voltage-boosting and voltage-stabilizing module is further connected with the collector of the triode Q7, that is, the output end of the voltage-boosting and voltage-stabilizing module is connected with the second input end of the auxiliary control module through the auxiliary control module, the voltage-boosting and voltage-stabilizing module converts the first power supply into a low voltage, that is, the voltage-boosting and voltage-stabilizing module converts the first power supply into a fourth power supply to provide a power supply for the voltage-boosting and voltage-stabilizing module, so that the voltage-boosting and voltage-stabilizing module can work normally, and the voltage-stabilizing module need not to be additionally connected with the power supply and optimize a circuit.
In order to further reduce the idle standby power consumption, referring to fig. 2, in one embodiment, the LED driving circuit 10 further includes a second switch module 600, a control end of the second switch module 600 is connected to the output end of the auxiliary control module 500, a first end of the second switch module 600 is used to connect to the cathode of the LED lamp, and a second end of the second switch module 600 is connected to the first end of the constant current driving module 200. Through setting up second switch module, then the LED lamp is in standby or when not working condition, auxiliary control module sends corresponding control signal to control second switch module's first end and second end disconnection, make the return circuit lose electricity, thereby further reduce idle standby power consumption, the loss of electric energy when the LED lamp is standby, reduce the electric energy extravagant, when the user need light the LED lamp, only need control module and send corresponding control signal, both can make the LED lamp light or normally work.
In one embodiment, referring to fig. 3 and 4, the second switch module includes a third control switch 610 and a fourth control switch 620, wherein a control end of the third control switch 610 is connected to an output end of the auxiliary control module 500, a first end of the third control switch 610 is connected to a cathode of the first LED lamp, a second end of the third control switch 610 is connected to a first end of the first constant current driving sub-module 210, a control end of the fourth control switch 620 is connected to a second output end of the auxiliary control module 500, a first end of the fourth control switch 620 is connected to a cathode of the second LED lamp, and a second end of the fourth control switch 620 is connected to a first end of the second constant current driving sub-module 220. In one embodiment, the third control switch includes a field effect transistor Q3, the fourth control switch includes a field effect transistor Q4, a gate of the field effect transistor Q3 is connected to the third output end of the auxiliary control module, a source of the field effect transistor Q3 is connected to the first end of the first constant current driving sub-module, a drain of the field effect transistor Q3 is used to connect to the cathode of the first LED lamp, a gate of the field effect transistor Q4 is connected to the output end of the auxiliary control module, a source of the field effect transistor Q4 is connected to the first end of the second constant current driving sub-module, a drain of the field effect transistor Q4 is used to connect to the cathode of the second LED lamp, and in one embodiment, the third control switch includes a MOS transistor Q3, and the fourth control switch includes a MOS transistor Q4.
In order to enable the LED driving circuit to use ac as a power source, in one embodiment, referring to fig. 2 and 8, the LED driving circuit 10 further includes a rectifying and filtering module 800, an input end of the rectifying and filtering module 800 is used for being connected to ac mains, and an input end of the rectifying and filtering module 800 is connected to the first input end of the voltage boosting and stabilizing module 100. In one embodiment, the output end of the rectifying and filtering module is also connected with the input end of the voltage transformation module. In one embodiment, the rectifying and filtering module 800 includes a bridge rectifying sub-module 810 and a low-pass filtering sub-module 820, wherein an input end of the bridge rectifying sub-module is used for connecting a voltage, an output end of the bridge rectifying sub-module is connected with an input end of the low-pass filtering sub-module, and an output end of the low-pass filtering sub-module is connected with a first input end of the boost voltage stabilizing module. Through setting up the rectification filter module, can turn into direct current voltage with exchanging the commercial power to for vary voltage module and step up voltage stabilizing module and provide direct current, thereby make LED drive circuit can direct connection exchanging the commercial power, LED drive circuit can adopt alternating current as the power promptly.
IN an embodiment, referring to fig. 4 and fig. 5, an input end of the rectifying and filtering module is used for being connected with an ac mains supply, an output end of the rectifying and filtering module is connected with a first end of the primary winding, the secondary winding is connected with a VCC pin of the boost voltage stabilizing chip U3, a G pin of the boost voltage stabilizing chip U3 is connected with a gate of the field effect transistor Q5, a CS pin of the boost voltage stabilizing chip U3 is connected with a source of the field effect transistor Q5, an output end of the auxiliary control module is connected with a VDD pin of the boost voltage stabilizing chip U3, an IN pin of the constant current chip U4 is used for being connected with a cathode of the LED lamp, a GND pin of the constant current chip U4 is used for being grounded, and a CS pin of the constant current chip U4 is connected with the first end of the first switch module.
In one embodiment, referring to fig. 9, there is provided an illumination lamp 20 comprising: the LED lamp 900 and the LED driving circuit in any of the foregoing embodiments, wherein the first input end of the voltage boosting and stabilizing module 100 is used for connecting with a power supply, the output end of the voltage boosting and stabilizing module 100 is connected with the anode of the LED lamp 900, and the cathode of the LED lamp 900 is connected with the constant current driving module 200.
Above-mentioned light, the steady voltage module that steps up the power into LED lamp rated voltage, outputs stable direct current to with the ripple voltage filtering in the power, provide stable direct current voltage for the LED lamp, make the electric current of LED lamp during operation invariable through setting up constant current drive module, consequently, through setting up the steady voltage module that steps up and constant current drive module, can reduce the jump of electric current or voltage during operation of LED lamp, can realize that the LED lamp does not have stroboscopic and shiny.
In one embodiment, the LED lamp includes a first LED lamp and a second LED lamp, an anode of the first LED lamp and an anode of the second LED lamp are connected with the output end of the voltage boosting and stabilizing module, a cathode of the first LED lamp is connected with the first end of the first constant current driving sub-module, and a cathode of the second LED lamp is connected with the second end of the second constant current driving sub-module.
In one embodiment, referring to fig. 4 to 8, there is provided an illumination lamp 20 comprising: the device comprises a rectifying and filtering module 800, a step-up voltage stabilizing module 100, a transformation module 700, a first LED lamp, a second LED lamp, a constant current driving module 200, a first switch module 400, a second switch module 600, a control module 300, an auxiliary control module 500 and a transformation module 700, wherein the step-up voltage stabilizing module 100 comprises a transformer T2, a step-up voltage stabilizing chip U3 and a field effect transistor Q5, the first switch module comprises a first control switch and a second control switch, the second switch module comprises a third control switch and a fourth control switch, the constant current driving module 200 comprises a first constant current driving sub-module 210 and a second constant current driving sub-module 220, the auxiliary control module comprises a field effect transistor Q6, a triode Q7 and a resistor R57, the input end of the rectifying and filtering module 800 is connected with the first end of a primary winding of the transformer T2, the second end of the primary winding of the transformer T2 is respectively connected with an anode of the first LED lamp and a second control switch, the second end of the primary winding of the transformer T2 is connected with the second end of the primary winding of the transformer T2 and the first end of the primary winding of the transformer T2 is connected with the first end of the first constant current driving sub-winding of the first LED lamp, the first end of the primary winding of the transformer T2 is connected with the first end of the primary winding of the Q2 is connected with the first end of the first constant current driving transistor Q5, the first end of the primary winding of the transformer is connected with the primary winding of the Q2 is connected with the first end of the primary winding of the Q5, the primary winding of the Q5 is connected with the first end of the primary winding of the primary transistor is connected with the first end of the primary transistor, the third end of the first constant current driving sub-module 210 is used for connecting a third power supply, the cathode of the second LED lamp is connected with the first end of the fourth control switch, the second end of the fourth control switch is connected with the first end of the second constant current driving sub-module 220, the second end of the second constant current driving sub-module 220 is used for grounding, the third end of the second constant current driving sub-module 220 is used for connecting a third power supply, the output end of the rectifying and filtering module 800 is also connected with the input end of the transforming module 700, the output end of the transforming module 700 is connected with the power supply end of the control module 300, the first output end of the control module 300 is connected with the control end of the first control switch, the second end of the first control switch is used for grounding, the first end of the first control switch is connected with the third end of the first constant current driving sub-module 210, the second output end of the control module 300 is connected with the control end of the second control switch, the second end of the second control switch is used for grounding, the first end of the second control switch is connected with the third end of the second constant current driving sub-module 220, the first output end and the second output end of the control module 300 are also connected with the grid electrode of a field effect transistor Q6, the source electrode of the field effect transistor Q6 is used for grounding, the drain electrode of the field effect transistor Q6 is connected with the base electrode of a triode Q7, the base electrode of the triode Q7 is also connected with the collector electrode of the triode Q7 through a resistor R57, the collector electrode of the triode Q7 is also connected with the output end of the voltage transformation module 700, the emitter electrode of the triode Q7 is connected with the second input end of the voltage boosting and stabilizing chip U2, the emitter of the triode Q7 is also connected with the control end of the third control switch and the control end of the fourth control switch respectively.
Through setting up voltage-boosting voltage-stabilizing module and constant current drive module to supply stable electric current and voltage for the LED lamp, make the LED lamp not have the stroboscopic and shine, and can realize that LED lamp reactive power reduces, realize that high power factor drives the LED lamp and shine, through setting up first LED lamp and second LED lamp, the user is through controlling control module so that first control switch control first LED lamp lights up or is extinguishing, and second control switch control second LED lamp lights up or is extinguishing, thereby realize the regulation of colour temperature, and when the LED lamp is in idle standby state, control module sends control signal, with supplementary control module with voltage-boosting voltage-stabilizing chip U3 disconnection, and supplementary control module control third control switch and fourth switch disconnection, thereby the light idle standby consumption has been reduced, reduce the electric energy waste.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. The LED driving circuit is characterized by comprising a boosting and voltage stabilizing module and a constant current driving module;
The first input end of the boosting and voltage stabilizing module is used for being connected with a first power supply, the output end of the boosting and voltage stabilizing module is used for being connected with an anode of the LED lamp, the first end of the constant current driving module is used for being connected with a cathode of the LED lamp, and the second end of the constant current driving module is used for being connected with a second power supply;
The voltage boosting and stabilizing module comprises a transformer T2, a voltage boosting and stabilizing chip U3 and a field effect transistor Q5, wherein the transformer T2 comprises a primary winding and a secondary winding, the primary winding is coupled with the secondary winding, a first end of the primary winding is used for being connected with a first power supply, a second end of the primary winding is used for being connected with an anode of the LED lamp, the secondary winding is connected with a first input end of the voltage boosting and stabilizing chip U3, a first output end of the voltage boosting and stabilizing chip U3 is connected with a grid electrode of the field effect transistor Q5, a second output end of the voltage boosting and stabilizing chip U3 is connected with a source electrode of the field effect transistor Q5, and a drain electrode of the field effect transistor Q5 is connected with a second end of the primary winding;
The constant current driving module comprises a resistor R1, a capacitor C1 and a constant current chip U4, wherein a first end of the constant current chip U4 is used for being connected with a cathode of the LED lamp, a second end of the constant current chip U4 is used for being connected with a second power supply, a third end of the constant current chip U4 is used for being connected with the third power supply through the resistor R1, and a second end of the constant current chip U4 is connected with the third end of the constant current chip U4 through the capacitor C1.
2. The LED driver circuit of claim 1, further comprising a control module and a first switch module, wherein an output of the control module is connected to a control end of the first switch module, a first end of the first switch module is configured to be grounded, and a second end of the first switch module is connected to a third end of the constant current driver module.
3. The LED driving circuit of claim 2, wherein the constant current driving module comprises a first constant current driving sub-module and a second constant current driving sub-module, the LED lamp comprises a first LED lamp and a second LED lamp, the first switch module comprises a first control switch and a second control switch, the output end of the voltage boosting and stabilizing module is connected with the anode of the first LED lamp and the anode of the second LED lamp respectively, the first end of the first constant current driving sub-module is used for connecting the cathode of the first LED lamp, the second end of the first constant current driving sub-module is used for connecting the second power supply, the third end of the first constant current driving sub-module is connected with the second end of the first control switch, the first end of the first control switch is used for grounding, the control end of the first control switch is connected with the first output end of the control module, the first end of the second constant current driving sub-module is used for connecting the cathode of the second LED lamp, the second end of the second constant current driving sub-module is used for connecting the second end of the second constant current driving sub-module with the second control switch, and the second end of the second constant current driving sub-module is connected with the second control switch.
4. A LED driving circuit according to claim 2 or 3, further comprising an infrared receiver connected to an input of the control module.
5. A LED driving circuit according to claim 2 or 3, further comprising a voltage transformation module, an input of the voltage transformation module being adapted to be connected to a first power source, an output of the voltage transformation module being connected to a power source of the control module.
6. A LED driving circuit according to claim 2 or 3, comprising an auxiliary control module, the output of the control module being further connected to a first input of the auxiliary control module, a second input of the auxiliary control module being adapted to be connected to a fourth power supply, the output of the auxiliary control module being connected to a second input of the boost voltage regulator module.
7. The LED driving circuit of claim 6, further comprising a second switch module, wherein a control end of the second switch module is connected to an output end of the auxiliary control module, a first end of the second switch module is used to connect to a cathode of the LED lamp, and a second end of the switch module is connected to a first end of the constant current driving module.
8. The LED driving circuit of claim 4, wherein the infrared receiver is adapted to control the first LED lamp and/or the second LED lamp to be turned on or off.
9. The LED driving circuit of claim 5, wherein the dc voltage of the first power source is reduced by the voltage transformation module to a low voltage dc power for the control module to supply power, the low voltage dc power being 16V.
10. A lighting lamp, comprising: the LED lamp and the LED driving circuit according to any one of claims 1 to 9, wherein the first input end of the boost voltage stabilizing module is used for being connected with a power supply, the output end of the boost voltage stabilizing module is connected with the anode of the LED lamp, the cathode of the LED lamp is connected with the first end of the constant current driving module, and the second end of the constant current driving module is used for being connected with a second power supply.
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