CN115087166A - LED control circuit and LED lamp - Google Patents

LED control circuit and LED lamp Download PDF

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Publication number
CN115087166A
CN115087166A CN202210776698.0A CN202210776698A CN115087166A CN 115087166 A CN115087166 A CN 115087166A CN 202210776698 A CN202210776698 A CN 202210776698A CN 115087166 A CN115087166 A CN 115087166A
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CN
China
Prior art keywords
circuit
switch
module
control circuit
sub
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Pending
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CN202210776698.0A
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Chinese (zh)
Inventor
张良良
吕国荣
朱奕光
焦志刚
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Foshan Electrical and Lighting Co Ltd
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Foshan Electrical and Lighting Co Ltd
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Priority to CN202210776698.0A priority Critical patent/CN115087166A/en
Publication of CN115087166A publication Critical patent/CN115087166A/en
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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
    • 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
    • H05B45/345—Current stabilisation; Maintaining constant current
    • 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
    • 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
    • H05B45/3725—Switched mode power supply [SMPS]
    • 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]
    • H05B45/40—Details of LED load circuits
    • 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]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/165—Controlling the light source following a pre-assigned programmed sequence; Logic control [LC]

Abstract

The invention relates to the technical field of LED control, and discloses an LED control circuit and an LED lamp. The LED control circuit comprises a power supply end, a drive control circuit, a conversion control circuit and a switch circuit, wherein the power supply end provides direct current power for the drive control circuit and the LED load, when the switch circuit is switched on, direct current output by the power supply end sequentially passes through the LED load, the conversion control circuit and the drive control circuit, the input end of the conversion control circuit is used for being connected with a first control signal, and the conversion control circuit is used for controlling the switching-on or switching-off of the switch circuit when the first control signal is switched on, so that the on-off of the LED load is controlled. The LED load control circuit controls the conduction condition of the LED load by receiving the control signal through the conversion control circuit, the conversion control circuit is connected with the same potential reference point with the drive control circuit on the DC path of the LED load, and the power supply of the LED load and the control signal of the LED load can be controlled without being on one reference ground plane.

Description

LED control circuit and LED lamp
Technical Field
The invention relates to the technical field of LED control, in particular to an LED control circuit and an LED lamp.
Background
In the prior art, a Light Emitting Diode (LED) is used as a lighting fixture, the LED is generally driven in a constant current manner, and the brightness of the LED is controlled in a Pulse Width Modulation (PWM) manner. The LED is adopted for illumination, and has the remarkable advantages of high luminous efficiency, obvious energy-saving effect, long service life, no pollution and the like.
At present, in some LED driving power supplies, the power supply of the LED lamp and the control signal of the LED lamp are not at a reference ground plane, if a communication path is to be established between them, voltage isolation is required, generally, a coupling device such as an optical coupler, an inductor or a capacitor is used to establish the communication path for the purpose of voltage isolation, and an ungrounded signal is transmitted through the coupling device such as the optical coupler, the inductor or the capacitor, which are complex and expensive.
Disclosure of Invention
The present invention is directed to an LED control circuit and an LED lamp, which solve one or more technical problems in the prior art and provide at least one of the advantages.
In a first aspect, an LED control circuit is provided for driving an LED load, including a power supply terminal, a driving control circuit, a conversion control circuit, and a switch circuit;
the power supply end is connected with the drive control circuit and the anode used for connecting the LED load and provides direct current power for the drive control circuit and the LED load;
the first end of the switch circuit is used for connecting the cathode of the LED load, the second end of the switch circuit is connected with the drive control circuit, and when the switch circuit is switched on, the direct current output by the power supply end sequentially passes through the LED load, the conversion control circuit and the drive control circuit;
the input end of the conversion control circuit is used for being connected with a first control signal, the output end of the conversion control circuit is connected with the trigger end of the switch circuit, the conversion control circuit and the drive control circuit are respectively connected with the same potential reference point, and the conversion control circuit is used for controlling the switch-on or switch-off of the switch circuit when the first control signal is accessed, so that the on-off of the LED load is controlled.
Further, the driving control circuit is used for being connected with a second control signal, the second control signal and the driving control circuit are connected with the same potential reference point, and the driving control circuit is used for controlling the current of the LED load according to the connected second control signal so as to adjust the brightness of the LED load.
Furthermore, the drive control circuit comprises a constant current drive module, an energy storage sub-circuit, a fly-wheel diode, a current sampling sub-circuit and a filter sub-circuit;
the driving input end of the constant current driving module is respectively connected with one end of the energy storage sub-circuit and the anode of the fly-wheel diode, the driving output end of the constant current driving module is grounded, the other end of the energy storage sub-circuit is respectively connected with the second end of the switch circuit and one end of the filter sub-circuit, the cathode of the fly-wheel diode is connected with the power supply end, the other end of the filter sub-circuit is connected with the power supply end, the current sampling end of the constant current driving module is grounded through the current sampling sub-circuit, and the power taking end of the constant current driving module is connected with the power supply end.
Further, the conversion control circuit comprises a first conversion control module and a second conversion control module, wherein a first end of the first conversion control module and a trigger end and a first end of the second conversion control module are respectively connected with direct-current voltage, a second end of the first conversion control module is grounded, and the trigger end of the first conversion control module is used for being connected with a first control signal;
the switch circuit comprises a first switch module, wherein a first end of the first switch module is used for being connected with a cathode of the LED load, a second end of the first switch module is connected with the driving control circuit, and a trigger end of the first switch module is connected with a second end of the second conversion control module.
Further, the switch circuit further comprises a second switch module, a first end of the second switch module is used for being connected with a cathode of the LED load, a second end of the second switch module is connected with the driving control circuit, a trigger end of the second switch module is connected with the direct-current voltage, and the LED load connected with the first switch module is connected with the LED load connected with the second switch module in parallel.
Further, when the first conversion control module is connected to the first control signal, the first switch module is switched on, and the second switch module is switched off; or is
When the first conversion control module is connected with the first control signal, the first switch module is switched off, and the second switch module is switched on.
Further, when the first conversion control module is connected to the first control signal, the first switch module and the second switch module are simultaneously conducted; or is
When the first conversion control module is connected with the first control signal, the first switch module and the second switch module are simultaneously turned off.
Further, the first conversion control module comprises a first switch, a first voltage division sub-circuit, a second voltage division sub-circuit and a first bias sub-circuit; one end of the first voltage division sub-circuit is used for connecting a first control signal, the other end of the first voltage division sub-circuit is respectively connected with a trigger end of the first switch and one end of the first bias sub-circuit, the first end of the first switch is connected with direct-current voltage through the second voltage division sub-circuit, and the second end of the first switch and the other end of the first bias sub-circuit are grounded;
the second conversion control module comprises a third switch and a fourth voltage-dividing sub-circuit; one end of the fourth voltage dividing sub-circuit is connected with the direct-current voltage, the other end of the fourth voltage dividing sub-circuit is connected with the trigger end of the third switch, and the first end of the third switch is connected with the direct-current voltage;
the first switch module comprises a second switch, a third voltage division sub-circuit and a second bias sub-circuit; one end of the third voltage division sub-circuit is connected with the second end of the third switch, the other end of the third voltage division sub-circuit is respectively connected with the trigger end of the second switch and one end of the second bias sub-circuit, the first end of the second switch is connected with the cathode used for connecting the LED load, and the second end of the second switch and the other end of the second bias sub-circuit are respectively connected with the driving control circuit;
the first switch is an NPN type triode or an N type MOS tube, and the third switch is a PNP type triode or a P type MOS tube; or the first switch is a PNP type triode or a P type MOS tube, and the third switch is an NPN type triode or an N type MOS tube.
Further, the second switch module comprises a fourth switch, a fifth voltage division sub-circuit, a voltage stabilizing sub-circuit and a second diode; direct current voltage is connected to the one end of fifth partial voltage subcircuit, and the trigger end of fourth switch and the one end of regulator subcircuit are connected respectively to the other end of fifth partial voltage subcircuit, and the first end of fourth switch is used for connecting the negative pole of LED load, and the drive control circuit is connected to the second end of fourth switch and the other end of regulator subcircuit, and the first end of second switch is connected to the negative pole of second diode, and the trigger end of fourth switch is connected to the positive pole of second diode.
Further, the second switch module comprises a fourth switch, a fifth voltage division sub-circuit and a voltage stabilizing sub-circuit; one end of the fifth voltage-dividing sub-circuit is connected with the direct-current voltage, the other end of the fifth voltage-dividing sub-circuit is respectively connected with the trigger end of the fourth switch and one end of the voltage-stabilizing sub-circuit, the first end of the fourth switch is used for being connected with the cathode of the LED load, and the second end of the fourth switch and the other end of the voltage-stabilizing sub-circuit are connected with the driving control circuit.
In a second aspect, an LED lamp is provided, comprising the LED control circuit of the first aspect.
The invention has the beneficial effects that: the switching control circuit is connected with the same potential reference point with the driving control circuit on the LED load direct current path, so that the power supply of the LED load and the control signal of the LED load can realize the control effect without being on one reference ground plane, the control signal controls the LED load which is not on the same ground, the power supply and control states are stable, and coupling devices such as an optical coupler, an inductor or a capacitor are not needed.
Drawings
Fig. 1 is a circuit configuration diagram of an LED control circuit according to an embodiment.
Fig. 2 is a circuit configuration diagram of a drive control circuit according to an embodiment.
Fig. 3 is a circuit configuration diagram of a switching control circuit and a switch circuit provided in the first embodiment.
Fig. 4 is a circuit configuration diagram of a switching control circuit and a switch circuit provided in a second embodiment.
Fig. 5 is a circuit configuration diagram of a switching control circuit and a switch circuit provided in a third embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the present invention will be further described with reference to the embodiments and the accompanying drawings.
In the description of the present invention, a plurality of the terms are not limited to a certain number, and a plurality of the terms are two or more, and the terms larger, smaller, larger, and the like are understood to include the number of the terms, and the terms larger, smaller, and the like are understood to include the number of the terms. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated. Additionally, appearing throughout and/or representing three juxtapositions, for example, A and/or B represents a solution satisfied by A, a solution satisfied by B, or a solution satisfied by both A and B.
In the description of the present invention, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, which may include other elements not expressly listed, in addition to those listed.
As described in the background art, the power supply to the LED load and the control signal to the LED load in the LED driving power supply are not located at a reference ground plane, and if a communication path is to be established therebetween, voltage isolation is required, and generally, a coupling device such as an optocoupler, an inductor, or a capacitor is used to establish the communication path for the purpose of voltage isolation, so as to ensure that the power supply to the LED load and the control signal to the LED load are located at a reference ground plane, and the power supply and control states are stable, however, the use of the coupling device such as the optocoupler, the inductor, or the capacitor makes the power supply structure complicated and the volume of the power supply greatly increased, and the material cost is expensive.
Based on this, the first aspect of the present invention provides an LED control circuit, configured to drive an LED load, and on the basis that no coupling device such as an optocoupler, an inductor, or a capacitor is used, the power supply of the LED load and a control signal of the LED load can be controlled without being located at a reference ground plane, so as to ensure stable and reliable power supply and control states.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an LED control circuit according to a first embodiment. As shown in fig. 1, the LED control circuit includes a power supply terminal Vin, a driving control circuit 100, a conversion control circuit 200, and a switch circuit 300, for driving an LED load.
In the LED control circuit, a power supply terminal Vin is connected with the drive control circuit 100 and an anode for connecting an LED load, and supplies direct current power to the drive control circuit 100 and the LED load; the first end of the switch circuit 300 is used for connecting the cathode of the LED load, the second end of the switch circuit 300 is connected to the driving control circuit 100, and when the switch circuit 300 is turned on, the power supply terminal Vin, the LED load, the conversion control circuit 200 and the driving control circuit 100 form a direct current path; the input end of the conversion control circuit 200 is used for connecting the first control signal PWM1, the output end of the conversion control circuit 200 is connected to the trigger end of the switch circuit 300, the conversion control circuit 200 and the driving control circuit 100 are respectively connected to the same potential reference point, and the conversion control circuit 200 is used for controlling the on/off of the switch circuit 300 when the first control signal PWM1 is switched on, so as to control the on/off of the LED load.
In this embodiment, the power supply terminal Vin outputs a dc power to provide the dc power to the driving control circuit 100 and the LED load, the driving control circuit 100 is powered on and started, and when the conversion control circuit 200 is connected to the first control signal PWM1, the conversion control circuit 200 controls the switch circuit 300 to be turned on, so that the power supply terminal Vin, the LED load, the conversion control circuit 200 and the driving control circuit 100 form a dc path, and the LED load emits light. Since the driving control circuit 100 and the converting control circuit 200 are respectively connected to the same potential reference point, more specifically, the driving control circuit 100 and the converting control circuit 200 are respectively connected to the same reference ground, the first control signal PWM1 is input to the converting control circuit 200 as a switch control signal, when the converting control circuit 200 is connected to the first control signal PWM1 and controls the switch circuit 300 to be turned on, the power supply terminal Vin and the driving control circuit 100 form a voltage difference, and the LED load emits light, thereby realizing the control of the non-common ground LED load by the field control signal.
In one embodiment, as shown in fig. 2, the driving control circuit 100 is configured to connect the second control signal PWM2, the second control signal PWM2 is connected to the same potential reference point as the driving control circuit 100, and the driving control circuit 100 is configured to control the current of the LED load according to the connected second control signal PWM2, so as to adjust the brightness of the LED load.
In this embodiment, the second control signal PWM2 is input to the driving control circuit 100 as a dimming control signal, and the voltage difference between the driving control circuit 100 and the power supply terminal Vin is controlled to adjust the brightness of the LED load. For example, the second control signal PWM2 decreases the voltage difference between the driving control circuit 100 and the power supply terminal Vin to decrease the brightness of the LED load, and the second control signal PWM2 increases the voltage difference between the driving control circuit 100 and the power supply terminal Vin to increase the brightness of the LED load.
As an alternative embodiment, as shown in fig. 2, the driving control circuit 100 includes a constant current driving module 110, a tank sub-circuit 120, a freewheeling diode D1, a current sampling sub-circuit 130, and a filtering sub-circuit 140. Specifically, the driving input end of the constant current driving module 110 is connected to one end of the energy storage sub-circuit 120 and the anode of the freewheeling diode D1, respectively, the driving output end of the constant current driving module 110 is grounded, the other end of the energy storage sub-circuit 120 is connected to the second end of the switch circuit 300 and one end of the filter sub-circuit 140, respectively, the cathode of the freewheeling diode D1 is connected to the power supply terminal Vin, the other end of the filter sub-circuit 140 is connected to the power supply terminal Vin, and the current sampling end of the constant current driving module 110 is grounded through the current sampling sub-circuit 130.
The constant current driving module 110 adjusts a voltage difference between an anode and a cathode of the LED load according to the second control signal PWM2 to control the brightness of the LED load. The constant current driving module 110 collects the voltage of the driving output end through the current sampling sub-circuit 130, calculates the current sampling signal through the collected voltage value and the internal resistance of the current sampling sub-circuit 130, and then controls the current of the LED load to realize the constant current control.
More specifically, the constant current driving module 110 selects a constant current driving chip U1, the current sampling sub circuit 130 includes a first sampling resistor RS1 and a second sampling resistor RS2, the first sampling resistor RS1 is connected in parallel with the second sampling resistor RS2, the energy storage sub circuit 120 includes a first inductor L1, the filter sub circuit 140 includes a first electrolytic capacitor CE1, an anode of the first electrolytic capacitor CE1 is connected to the power supply terminal Vin, and a cathode of the first electrolytic capacitor CE1 is connected to the driving input terminal of the constant current driving module 110 through a first inductor L1.
In one embodiment, as shown in fig. 3, the switching control circuit 200 includes a first switching control module 210 and a second switching control module 220, and the switching circuit 300 includes a first switching module 310. Specifically, a first terminal of the first conversion control module 210 and a trigger terminal and a first terminal of the second conversion control module 220 are respectively connected to the dc voltage LED +, a second terminal of the first conversion control module 210 is grounded, the trigger terminal of the first conversion control module 210 is used for connecting the first control signal PWM1, the first terminal of the first switch module 310 is used for connecting a cathode of the LED load, the second terminal of the first switch module 310 is connected to the driving control circuit 100, and the trigger terminal of the first switch module 310 is connected to the second terminal of the second conversion control module 220.
The conversion control circuit 200 enables control of the off-common LED load by the field control signal. When the first control signal PWM1 triggers the first conversion control module 210 to turn on, the dc voltage LED + flows to the reference ground through the first conversion control module 210, and the voltage at the trigger end of the second conversion control module 220 is lowered, so that the second conversion control module 220 is turned on, the dc voltage LED + flows to the trigger end of the first switch module 310, which triggers the first switch module 310 to turn on, the voltage difference formed at two ends of the LED load turns on the LED load, and the LED load emits light.
Further, the first conversion control module 210 includes a first switch Q1, a first voltage-dividing sub-circuit 211, a second voltage-dividing sub-circuit 212, and a first biasing sub-circuit 213; one end of the first voltage-dividing sub-circuit 211 is used for connecting the first control signal PWM1, the other end of the first voltage-dividing sub-circuit 211 is respectively connected to the trigger end of the first switch Q1 and one end of the first bias sub-circuit 213, the first end of the first switch Q1 is connected to the dc voltage LED + through the second voltage-dividing sub-circuit 212, and the second end of the first switch Q1 and the other end of the first bias sub-circuit 213 are grounded. The second conversion control module 220 includes a third switch Q3 and a fourth voltage dividing sub-circuit 221; one end of the fourth voltage dividing sub-circuit 221 is connected to the dc voltage LED +, the other end of the fourth voltage dividing sub-circuit 221 is connected to the trigger end of the third switch Q3, and the first end of the third switch Q3 is connected to the dc voltage LED +. The first switching module 310 includes a second switch Q2, a third voltage division subcircuit 311, and a second biasing subcircuit 312; one end of the third voltage dividing sub-circuit 311 is connected to the second end of the third switch Q3, the other end of the third voltage dividing sub-circuit 311 is connected to the trigger end of the second switch Q2 and one end of the second bias sub-circuit 312, the first end of the second switch Q2 is connected to the cathode of the LED load, and the second end of the second switch Q2 and the other end of the second bias sub-circuit 312 are connected to the driving control circuit 100. The first switch Q1 is an NPN-type triode or an N-type MOS transistor, and the third switch Q3 is a PNP-type triode or a P-type MOS transistor; or the first switch Q1 is a PNP triode or a P MOS transistor, and the third switch Q3 is an NPN triode or an N MOS transistor.
In one embodiment, as shown in fig. 4, based on the embodiment of fig. 3, the switch circuit 300 further includes a second switch module 320, and the first switch module 310 and the second switch module 320 respectively control at least two groups of LED loads. Specifically, a first terminal of the second switch module 320 is used for connecting a cathode of the LED load, a second terminal of the second switch module 320 is connected to the driving control circuit 100, a trigger terminal of the second switch module 320 is connected to the direct current voltage LED +, and the LED load connected to the first switch module 310 is connected in parallel to the LED load connected to the second switch module 320.
In this embodiment, when the first switching control module 210 is connected to the first control signal PWM1, the first switching control module 210 and the second switching control module 220 are simultaneously turned on, so that the first switch module 310 is turned off and the second switch module 320 is turned on; or when the first switching control module 210 switches in the first control signal PWM1, the first switching control module 210 and the second switching control module 220 are simultaneously switched off, so that the first switching module 310 is switched on and the second switching module 320 is switched off. When the first control signal PWM1 triggers the first switching control module 210 to turn on, the second switching control module 220 also turns on at the same time, and the dc voltage LED + flows to the reference ground through the first switching control module 210 and flows to the trigger terminal of the first switching module 310 through the second switching control module 220, so that the first switching module 310 turns on, the level of the trigger terminal of the second switching module 320 is lowered, the second switching module 320 turns off, the LED load connected to the first switching module 310 emits light, and the LED load connected to the second switching module 320 does not emit light; when the first control signal PWM1 triggers the first switching control module 210 to turn off, the second switching control module 220 turns off at the same time, and the dc voltage LED + flows to the trigger terminal of the first switching module 310, so that the first switching module 310 turns off and the second switching module 320 turns on, the LED load connected to the first switching module 310 does not emit light, and the LED load connected to the second switching module 320 emits light.
Further, the second switch module 320 includes a fourth switch Q4, a fifth voltage division sub-circuit 321, a voltage regulation sub-circuit 322, and a second diode D2. Specifically, one end of the fifth voltage-dividing sub-circuit 321 is connected to the dc voltage, the other end of the fifth voltage-dividing sub-circuit 321 is connected to the trigger terminal of the fourth switch Q4 and the cathode of the voltage-stabilizing sub-circuit 322, the first terminal of the fourth switch Q4 is used for connecting the cathode of the LED load, the second terminal of the fourth switch Q4 and the anode of the voltage-stabilizing sub-circuit 322 are connected to the driving control circuit, the cathode of the second diode D2 is connected to the first terminal of the second switch Q2, and the anode of the second diode D2 is connected to the trigger terminal of the fourth switch Q4. When the second switch Q2 is turned on, the trigger terminal level of the fourth switch Q4 is pulled down through the second diode D2, so that the fourth switch Q4 is turned off. In this embodiment, the voltage regulator sub-circuit 322 employs a zener diode ZD1, a cathode of the zener diode ZD1 is connected to the trigger terminal of the fourth switch Q4, and an anode of the zener diode ZD1 is connected to the second terminal of the fourth switch Q4. In some other embodiments, the zener diode ZD1 may also be selected as a resistor.
In one embodiment, as shown in fig. 5, the switch circuit 300 includes a first switch module 310 and a second switch module 320, and the first switch module 310 and the second switch module 320 respectively control at least two groups of LED loads, which is different from the embodiment of fig. 4 in that when the first switching control module 210 is connected to the first control signal PWM1, the first switch module 310 and the second switch module 320 are simultaneously turned on, or when the first switching control module 210 is connected to the first control signal PWM1, the first switch module 310 and the second switch module 320 are simultaneously turned off.
Specifically, the second switch module 320 includes a fourth switch Q4, a fifth voltage division sub-circuit 321, and a voltage regulation sub-circuit 322. One end of the fifth voltage division sub-circuit 321 is connected to the dc voltage LED +, the other end of the fifth voltage division sub-circuit 321 is connected to the trigger end of the fourth switch Q4 and one end of the voltage stabilization sub-circuit 322, the first end of the fourth switch Q4 is used for connecting the cathode of the LED load, and the second end of the fourth switch Q4 and the other end of the voltage stabilization sub-circuit 322 are connected to the driving control circuit 100. In this embodiment, when the first control signal PWM1 triggers the first switching control module 210 to turn on, the second switching control module 220 also turns on at the same time, the dc voltage LED + flows to the reference ground through the first switching control module 210 and flows to the trigger terminal of the first switch module 310 and the trigger terminal of the second switch module 320 through the second switching control module 220, respectively, the first switch module 310 and the second switch module 320 turn on at the same time, and the LED loads connected to the first switch module 310 and the second switch module 320 emit light at the same time; conversely, the first switch module 310 and the second switch module 320 are turned off at the same time, and the LED loads connected to the first switch module 310 and the second switch module 320 are turned off at the same time.
In some other embodiments, when the first switching control module 210 switches in the first control signal PWM1, the first switching control module 210 is turned on, and the second switching control module 220 is turned off, so that the first switching module 310 and the second switching module 320 are turned off at the same time; or when the first switching control module 210 switches in the first control signal PWM1, the first switching control module 210 is turned off, and the second switching control module 220 is turned on, so that the first switching module 310 and the second switching module 320 are turned on simultaneously. When the first control signal PWM1 triggers the first conversion control module 210 to turn on and the second conversion control module 220 to turn off, the dc voltage LED + flows to the ground through the first conversion control module 210, so that the first switch module 310 and the second switch module 320 are turned off at the same time, and the LED loads connected to the first switch module 310 and the second switch module 320 do not emit light; when the first control signal PWM1 triggers the first switching control module 210 to turn off and the second switching control module 220 to turn on, the dc voltage LED + flows to the trigger terminal of the first switch module 310 and flows to the trigger terminal of the second switch module 320 through the second switching control module 220, so that the first switch module 310 turns on and the second switch module 320 turns on simultaneously, and the LED loads connected to the first switch module 310 and the second switch module 320 emit light.
The first voltage-dividing sub-circuit 211, the second voltage-dividing sub-circuit 212, the third voltage-dividing sub-circuit 311, the fourth voltage-dividing sub-circuit 221 and the fifth voltage-dividing sub-circuit 321 mentioned in the above embodiments are formed by connecting one or more resistors in series.
The LED control circuit of the embodiment of the invention receives the control signal through the conversion control circuit 200 to control the conduction condition of the LED load, the conversion control circuit 200 is connected with the drive control circuit 100 on the DC path of the LED load at the same potential reference point to control the LED load at different grounds by the signal on the spot, so that the power supply of the LED load and the control signal of the LED load are not on the same reference ground plane, the control effect can be realized, the power supply and control states are stable, and coupling devices such as an optical coupler, an inductor or a capacitor are not needed.
According to a second aspect of the present invention, an LED lamp is provided, where the LED lamp includes the LED control circuit, and the specific structure of the LED control circuit refers to the foregoing embodiments.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (11)

1. An LED control circuit is used for driving an LED load and is characterized by comprising a power supply end, a driving control circuit, a conversion control circuit and a switch circuit;
the power supply end is connected with the drive control circuit and an anode used for being connected with the LED load, and provides direct current power for the drive control circuit and the LED load;
the first end of the switch circuit is used for connecting the cathode of the LED load, the second end of the switch circuit is connected with the drive control circuit, and when the switch circuit is switched on, the direct current output by the power supply end sequentially passes through the LED load, the conversion control circuit and the drive control circuit;
the input end of the conversion control circuit is used for being connected with a first control signal, the output end of the conversion control circuit is connected with the trigger end of the switch circuit, the conversion control circuit and the drive control circuit are respectively connected with the same potential reference point, and the conversion control circuit is used for controlling the switch-on or switch-off of the switch circuit when the first control signal is accessed, so that the on-off of the LED load is controlled.
2. The LED control circuit of claim 1, wherein the driving control circuit is configured to connect a second control signal, the second control signal is connected to a same potential reference point as the driving control circuit, and the driving control circuit is configured to control a current of the LED load according to the connected second control signal to adjust a brightness of the LED load.
3. The LED control circuit according to claim 1 or 2, wherein the drive control circuit comprises a constant current drive module, an energy storage sub-circuit, a freewheeling diode, a current sampling sub-circuit and a filtering sub-circuit;
the driving input end of the constant current driving module is respectively connected with one end of the energy storage sub-circuit and the anode of the fly-wheel diode, the driving output end of the constant current driving module is grounded, the other end of the energy storage sub-circuit is respectively connected with the second end of the switch circuit and one end of the filter sub-circuit, the cathode of the fly-wheel diode is connected with the power supply end, the other end of the filter sub-circuit is connected with the power supply end, the current sampling end of the constant current driving module is grounded through the current sampling sub-circuit, and the power taking end of the constant current driving module is connected with the power supply end.
4. The LED control circuit of claim 1,
the conversion control circuit comprises a first conversion control module and a second conversion control module, wherein a first end of the first conversion control module and a trigger end and a first end of the second conversion control module are respectively connected with direct-current voltage, a second end of the first conversion control module is grounded, and the trigger end of the first conversion control module is used for being connected with a first control signal;
the switch circuit comprises a first switch module, wherein a first end of the first switch module is used for being connected with a cathode of the LED load, a second end of the first switch module is connected with the driving control circuit, and a trigger end of the first switch module is connected with a second end of the second conversion control module.
5. The LED control circuit of claim 4,
the switch circuit further comprises a second switch module, wherein a first end of the second switch module is used for being connected with a cathode of the LED load, a second end of the second switch module is connected with the driving control circuit, a trigger end of the second switch module is connected with direct-current voltage, and the LED load connected with the first switch module is connected with the LED load connected with the second switch module in parallel.
6. The LED control circuit of claim 5,
when the first conversion control module is connected with a first control signal, the first switch module is switched on, and the second switch module is switched off; or is
When the first conversion control module is connected with the first control signal, the first switch module is switched off, and the second switch module is switched on.
7. The LED control circuit of claim 5,
when the first conversion control module is connected with a first control signal, the first switch module and the second switch module are simultaneously conducted; or is
When the first conversion control module is connected with a first control signal, the first switch module and the second switch module are simultaneously turned off.
8. LED control circuit according to any of claims 4 to 7,
the first conversion control module comprises a first switch, a first voltage division sub-circuit, a second voltage division sub-circuit and a first bias sub-circuit; one end of the first voltage division sub-circuit is used for connecting a first control signal, the other end of the first voltage division sub-circuit is respectively connected with a trigger end of a first switch and one end of a first bias sub-circuit, the first end of the first switch is connected with direct-current voltage through a second voltage division sub-circuit, and the second end of the first switch and the other end of the first bias sub-circuit are grounded;
the second conversion control module comprises a third switch and a fourth voltage-dividing sub-circuit; one end of the fourth voltage dividing sub-circuit is connected with direct-current voltage, the other end of the fourth voltage dividing sub-circuit is connected with a trigger end of a third switch, and a first end of the third switch is connected with the direct-current voltage;
the first switch module comprises a second switch, a third voltage division sub-circuit and a second bias sub-circuit; one end of the third voltage division sub-circuit is connected with a second end of the third switch, the other end of the third voltage division sub-circuit is respectively connected with a trigger end of the second switch and one end of the second bias sub-circuit, the first end of the second switch is connected with a cathode used for connecting an LED load, and the second end of the second switch and the other end of the second bias sub-circuit are respectively connected with the driving control circuit;
the first switch is an NPN type triode or an N type MOS tube, and the third switch is a PNP type triode or a P type MOS tube; or the first switch is a PNP type triode or a P type MOS tube, and the third switch is an NPN type triode or an N type MOS tube.
9. LED control circuit according to claim 5 or 6,
the second switch module comprises a fourth switch, a fifth voltage division sub-circuit, a voltage stabilizing sub-circuit and a second diode; direct current voltage is connected to fifth partial pressure subcircuit's one end, the trigger end and the one end of steady voltage subcircuit of fourth switch are connected respectively to the other end of fifth partial pressure subcircuit, the first end of fourth switch is used for connecting the negative pole of LED load, the drive control circuit is connected to the second end of fourth switch and the other end of steady voltage subcircuit, the first end of second switch is connected to the negative pole of second diode, the trigger end of fourth switch is connected to the positive pole of second diode.
10. The LED control circuit of claim 7,
the second switch module comprises a fourth switch, a fifth voltage division sub-circuit and a voltage stabilizing sub-circuit; direct current voltage is connected to the one end of fifth partial pressure subcircuit, the trigger end and the one end of steady voltage subcircuit of fourth switch are connected respectively to the other end of fifth partial pressure subcircuit, the first end of fourth switch is used for connecting the negative pole of LED load, the second end of fourth switch and the other end of steady voltage subcircuit are connected drive control circuit.
11. An LED lamp comprising the LED control circuit of any one of claims 1 to 10.
CN202210776698.0A 2022-06-30 2022-06-30 LED control circuit and LED lamp Pending CN115087166A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210776698.0A CN115087166A (en) 2022-06-30 2022-06-30 LED control circuit and LED lamp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210776698.0A CN115087166A (en) 2022-06-30 2022-06-30 LED control circuit and LED lamp

Publications (1)

Publication Number Publication Date
CN115087166A true CN115087166A (en) 2022-09-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210776698.0A Pending CN115087166A (en) 2022-06-30 2022-06-30 LED control circuit and LED lamp

Country Status (1)

Country Link
CN (1) CN115087166A (en)

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