CN216057564U - LED drive circuit and LED lamp - Google Patents

LED drive circuit and LED lamp Download PDF

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Publication number
CN216057564U
CN216057564U CN202122067047.8U CN202122067047U CN216057564U CN 216057564 U CN216057564 U CN 216057564U CN 202122067047 U CN202122067047 U CN 202122067047U CN 216057564 U CN216057564 U CN 216057564U
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resistor
led lamp
module
voltage
led
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黄始文
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Huizhou Topband Electronic Technology Co Ltd
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Huizhou Topband Electronic Technology Co Ltd
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    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

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Abstract

The utility model is used in the technical field of LED lamps, and provides an LED drive circuit and an LED lamp, wherein the circuit comprises an LED drive module, a driving module and a control module, wherein the LED drive module is connected with an LED lamp and is used for driving the LED lamp to work; the current detection module is connected with the LED lamp and used for detecting the working current of the LED lamp; the control module is connected with the current detection module and used for outputting a control signal according to the working current; and the voltage regulating module is connected with the control module and the OVP port of the LED driving module and used for lifting the set voltage of the OVP port according to the control signal. According to the utility model, the LED driving module outputs voltage to drive the LED lamp to work, the control module outputs a control signal according to the working current of the LED lamp detected by the current detection module to control the voltage regulation module to raise the set voltage of the OVP port of the LED driving module, so that the OVP voltage of the LED driving module is raised to a certain extent, and further the raised OVP voltage is higher than the sum of the forward voltage and the hysteresis voltage of the LED lamp, thereby reducing the condition that the LED lamp cannot be lightened.

Description

LED drive circuit and LED lamp
Technical Field
The utility model belongs to the technical field of LED lamps, and particularly relates to an LED driving circuit and an LED lamp.
Background
The LED lamp is a light emitting diode which is composed of a PN junction as a common diode and also has unidirectional conductivity. When a forward voltage is applied to the light emitting diode, holes injected from the P region to the N region and electrons injected from the N region to the P region recombine with the electrons in the N region and the holes in the P region within a few micrometers near the PN junction, respectively, and spontaneous emission fluorescence is generated.
The existing LED driving circuit usually includes a dedicated LED driving chip, which has an OVP (over voltage protection) function, and the OVP function has a hysteresis voltage, and the hysteresis voltage has the function of reducing the power consumption of the circuit when the LED is open-circuited, and is turned on again when the output voltage drops to a certain value. In practical applications, the sum of VF (forward voltage) and the hysteresis voltage of the LED lamp must be lower than the OVP set voltage, but the maximum voltage in the LED driving circuit is limited due to the safety requirement, and when the forward voltage of the LED lamp approaches the maximum safe voltage, the LED lamp may not be normally turned on due to the hysteresis voltage of the OVP.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides an LED drive circuit, aiming at solving the problem that the LED lamp cannot be lightened due to the hysteresis voltage of an OVP when the forward voltage of the LED lamp in the conventional LED drive circuit is close to the highest safe voltage.
An embodiment of the present invention provides an LED driving circuit, including:
the LED driving module is connected with the LED lamp and used for driving the LED lamp to work;
the current detection module is connected with the LED lamp and used for detecting the working current of the LED lamp;
the control module is connected with the current detection module and used for outputting a control signal according to the working current;
and the voltage regulating module is connected with the control module and the OVP port of the LED driving module and used for lifting the set voltage of the OVP port according to the control signal.
Further, the LED driving module comprises a driving chip, a first resistor, a second resistor, a third resistor, a first capacitor and a first diode;
the anode of the first diode is connected with the first input end, the cathode of the first diode is connected with one end of the LED lamp, the other end of the LED lamp is grounded, the first input end is also connected with the voltage input end of the driving chip, and the grounding end of the driving chip is grounded;
the cathode of the first diode is also connected with one end of a first resistor, the other end of the first resistor is connected with one end of a second resistor and the OVP port of the driving chip, and the other end of the second resistor is grounded through a third resistor;
the cathode of the first diode is also connected with one end of the first capacitor, and the other end of the first capacitor is grounded.
Further, the current detection module comprises a fourth resistor and a fifth resistor;
the LED lamp is connected with the fourth resistor in series and then grounded;
one end of the fourth resistor, which is connected with the LED lamp, is connected with one end of the fifth resistor, and the other end of the fifth resistor is connected with the control module.
Furthermore, the control module comprises a control chip and a chip peripheral circuit, a first input/output end of the control chip is connected with the current detection module, and a second input/output end of the control chip is connected with the voltage regulation module.
Further, the voltage regulation module comprises a first switch element, a sixth resistor and a seventh resistor;
one end of a sixth resistor is connected with the control module, and the other end of the sixth resistor is connected with a first pole tube foot of the first switching element;
the second-stage pin of the first switching element is grounded, and the third-stage pin of the first switching element is connected with the other end of the second resistor;
one end of the seventh resistor is connected with the first pole tube pin of the first switch element, and the other end of the seventh resistor is connected with the second pole tube pin of the first switch element.
Further, the first switching element includes any one of a transistor, a MOS transistor, and an IGBT.
In a second aspect, the present application further provides an LED lamp, which includes the LED driving circuit as described above.
According to the embodiment of the utility model, the LED driving module outputs voltage to drive the LED lamp to work, the control module outputs a control signal according to the working current of the LED lamp detected by the current detection module to control the voltage regulation module to raise the set voltage of the OVP port of the LED driving module, so that the OVP voltage of the LED driving module is raised by a certain amplitude, and the raised OVP voltage is higher than the sum of the forward voltage and the hysteresis voltage of the LED lamp, thereby reducing the condition that the LED lamp cannot be lightened.
Drawings
Fig. 1 is a schematic block diagram of an embodiment of an LED driving circuit according to the present invention;
fig. 2 is a schematic circuit structure diagram of a first embodiment of an LED driving circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
In the existing driving circuit, when the forward voltage of the LED lamp is close to the highest safe voltage, the situation that the LED lamp cannot be normally lighted due to the hysteresis voltage of the OVP may be caused. According to the utility model, the situation that the LED lamp cannot be lightened can be reduced by lifting the OVP voltage of the LED driving module.
Example one
In some alternative embodiments, as shown in fig. 1, an embodiment of the present application provides an LED driving circuit, which includes an LED driving module 100, a current detection module 200, a control module 300, and a voltage regulation module 400.
The LED driving module 100 is connected with the LED lamp and used for driving the LED lamp to work;
the current detection module 200 is connected with the LED lamp and is used for detecting the working current of the LED lamp;
the control module 300 is connected with the current detection module 200 and is used for outputting a control signal according to the working current;
the voltage adjusting module 400 is connected to the OVP ports of the control module 300 and the LED driving module 100, and is configured to raise the set voltage of the OVP port according to the control signal.
In implementation, the LED lamp may adopt one LED lamp bead or an LED lamp string formed by connecting more than one LED lamp bead in series, for example, the LED lamp string includes N LED lamp beads, which are LED1, LED2 to LEDN, where N is greater than or equal to 1, and the forward voltage of the LED lamp is the anode voltage of the first LED lamp bead in the series-connected LED lamp beads, for example, the LED1 and the LED2 to LEDN are connected in series in sequence, where one end of the LED1, which is far away from the LED2, is connected to the output end of the LED driving module 100, and then the voltage of one end of the LED1, which is far away from the LED2, is the forward voltage of the LED lamp. Because the LED lamp beads are connected in series, the currents of the LED lamp beads are the same, and the current detection module 200 can be connected with any one of the LED lamp beads to detect the working current of the LED lamp.
Upon receiving the operating current of the LED lamp detected by the current detection module 200, outputs a control signal to the voltage regulation module 400, the voltage regulation module 400 can raise the set voltage of the OVP port of the LED driving module 100, in practice, the voltage at the OVP port, i.e. the OVP voltage, is adjustable, for example, when the LED lamp is not operating, the default voltage of the OVP voltage is Y1, when the LED lamp is driven by the LED driving module 100 to operate, the voltage regulating module 400 increases the voltage of the OVP voltage to Y2, for example, the voltage regulation module 400 outputs a compensation voltage to the OVP port to raise the OVP voltage to Y2, Y2 > Y1, even when the VF (forward voltage) of the LED lamp is close to the highest safe voltage, for example, the sum of VF and the hysteresis current is equal to Y1, since Y2 is higher than Y1, the sum of VF and the hysteresis current of the LED lamp is still less than Y2, and the LED lamp can still be driven normally.
In some embodiments, for example, the safety voltage in safety regulations cannot exceed 60V, VF of the LED lamp is 56V, OVP voltage of the LED driving module 100 can only be set to 59V, if the LED driving module 100 has 3V hysteretic voltage, the sum of VF and hysteretic voltage reaches OVP voltage, and although current passes through the LED lamp, the LED lamp cannot be normally turned on. When the current detection module 200 detects that the LED lamp has a current, the control module 300 outputs a control signal to the voltage regulation module 400, so that the voltage regulation module 400 raises the OVP voltage, and thus the OVP voltage is higher than the sum of VF and the hysteresis voltage, and the LED lamp can be normally turned on.
This application is worked in order to drive the LED lamp through LED drive module 100 output voltage, control module 300 detects the operating current output control signal of LED lamp according to current detection module 200, set up the voltage with the OVP port of control voltage regulation module 400 lifting LED drive module 100, thereby make the OVP voltage of LED drive module 100 improve certain range, and then make the OVP voltage after improving be higher than the sum of the forward voltage and the hysteresis voltage of LED lamp, in order to reduce the condition that can't light the LED lamp.
Example two
In some alternative embodiments, as shown in fig. 2, the LED driving module 100 includes a driving chip U1, a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1 and a first diode D1;
the anode of the first diode D1 is connected with a first input terminal Vin, the cathode of the first diode D1 is connected with one end of the LED lamp, the other end of the LED lamp is grounded, the first input terminal Vin is also connected with a voltage input terminal VCC of the driving chip U1, and the ground terminal GND of the driving chip U1 is grounded;
the cathode of the first diode D1 is further connected with one end of a first resistor R1, the other end of the first resistor R1 is connected with one end of a second resistor R2 and the OVP port of the driving chip U1, and the other end of the second resistor R2 is grounded through a third resistor R3;
the cathode of the first diode D1 is also connected to one end of a first capacitor C1, and the other end of the first capacitor C1 is grounded.
The current detection module 200 includes a fourth resistor R4 and a fifth resistor R5; the LED lamp is connected with a fourth resistor R4 in series and then is grounded; one end of the fourth resistor R4 connected with the LED lamp is connected with one end of the fifth resistor R5, and the other end of the fifth resistor R5 is connected with the control module 300. Specifically, the other end of the LED lamp is connected to one end of a fourth resistor R4, and the other end of the fourth resistor R4 is grounded; the other end of the LED lamp is connected with one end of a fifth resistor R5, and the other end of the fifth resistor R5 is connected with the control module 300.
In implementation, the control module 300 includes a control chip U2 and a chip peripheral circuit (not shown), a first input/output IO1 of the control chip U2 is connected to the current detection module 200, and a second input/output IO2 of the control chip U2 is connected to the voltage regulation module 400.
The voltage regulation module 400 includes a first switching element Q1, a sixth resistor R6, and a seventh resistor R7;
one end of the sixth resistor R6 is connected to the control module 300, and the other end of the sixth resistor R6 is connected to the first pole leg of the first switching element Q1;
a second-stage pin of the first switching element Q1 is grounded, and a third-stage pin of the first switching element Q1 is connected to the other end of the second resistor R2;
one end of the seventh resistor R7 is connected to the first pole pin of the first switching element Q1, and the other end of the seventh resistor R7 is connected to the second pole pin of the first switching element Q1. Specifically, the first input/output terminal IO1 is connected to the other end of the fifth resistor R5, and the second input/output terminal IO2 is connected to one end of the sixth resistor R6.
In practice, the driving chip U1 may be a common LED driving chip, and the types of the driving chip U1 include, but are not limited to, CAT4201, LM3404, AMC7150, SB42511, and the like, and may be used for driving an LED lamp to work, and are not limited specifically herein.
The first input terminal Vin can supply power to the driving chip U1, the first resistor R1, the second resistor R2 and the third resistor R3 form a voltage dividing resistor, and the OVP voltage is determined by the resistances of the first resistor R1, the second resistor R2 and the third resistor R3. The control chip U2 may adopt a single chip microcomputer, for example, a 51 single chip microcomputer, a voltage terminal of the control chip U2 is connected to the chip power supply terminal VDD, a first input/output terminal IO1 of the control chip U2 detects a working current of the LED lamp through a fifth resistor R5, and outputs a control signal to the first switching element Q1 through a second input/output terminal IO2, and the first switching element Q1 may adopt a triode, a MOS transistor or an IGBT. The first, second, and third pole pins of the first switching element Q1 correspond to three pins of a transistor, a MOS transistor, or an IGBT, respectively, for example, when the first switching element Q1 is a transistor, the first, second, and third pole pins of the first switching element Q1 correspond to a base, an emitter, and a collector of the transistor, respectively, and when the first switching element Q1 is a MOS transistor, the first, second, and third pole pins of the first switching element Q1 correspond to a gate, a source, and a drain of the MOS transistor, respectively.
Taking the first switching element Q1 as an NMOS transistor, a gate of the NMOS transistor is connected to the other end of the sixth resistor R6, a source of the NMOS transistor is grounded, a drain of the NMOS transistor is connected to a line between the second resistor R2 and the third resistor R3, when the control chip U2 detects that the LED lamp has a current, the first switching element Q1 is controlled to be turned on to short-circuit the third resistor R3, so that the OVP voltage of the driving chip U1 is increased, for example, the safety voltage in the above safety regulations cannot exceed 60V, the OVP voltage of the LED driving module 100 is set to 59V, if the LED driving module 100 still has a hysteresis voltage of 3V, when the VF of the LED lamp is 56V, by raising the OVP voltage, for example, raising the OVP voltage to 59.5V, the sum of the VF and the hysteresis voltage is lower than OVP, so that the LED lamp can be normally driven.
EXAMPLE III
In some optional embodiments, the present application further provides an LED lamp comprising the LED driving circuit as described above.
The LED lamp includes an LED driving module 100, a current detection module 200, a control module 300, and a voltage regulation module 400. The LED driving module 100 is connected with the LED lamp and used for driving the LED lamp to work; the current detection module 200 is connected with the LED lamp and is used for detecting the working current of the LED lamp; the control module 300 is connected with the current detection module 200 and is used for outputting a control signal according to the working current; the voltage adjusting module 400 is connected to the OVP ports of the control module 300 and the LED driving module 100, and is configured to raise the set voltage of the OVP port according to the control signal.
In implementation, the LED lamp may be a single LED lamp bead or a string of LED lamps formed by connecting more than one LED lamp beads in series, because the LED lamp beads are connected in series, the currents of the LED lamp beads are the same, and the current detection module 200 may be connected to any one of the LED lamp beads to detect the operating current of the LED lamp.
Upon receiving the operating current of the LED lamp detected by the current detection module 200, outputs a control signal to the voltage regulation module 400, the voltage regulation module 400 can raise the set voltage of the OVP port of the LED driving module 100, in practice, the voltage at the OVP port, i.e. the OVP voltage, is adjustable, for example, when the LED lamp is not operating, the default voltage of the OVP voltage is Y1, when the LED lamp is driven by the LED driving module 100 to operate, the voltage regulating module 400 increases the voltage of the OVP voltage to Y2, for example, the voltage regulation module 400 outputs a compensation voltage to the OVP port to raise the OVP voltage to Y2, Y2 > Y1, even when the VF of the LED lamp is close to the highest safe voltage, for example, the sum of VF and the hysteresis current is equal to Y1, since Y2 is higher than Y1, the sum of VF and the hysteresis current of the LED lamp is still less than Y2, and the LED lamp can still be driven normally.
This application is worked in order to drive the LED lamp through LED drive module 100 output voltage, control module 300 detects the operating current output control signal of LED lamp according to current detection module 200, set up the voltage with the OVP port of control voltage regulation module 400 lifting LED drive module 100, thereby make the OVP voltage of LED drive module 100 improve certain range, and then make the OVP voltage after improving be higher than the sum of the forward voltage and the hysteresis voltage of LED lamp, in order to reduce the condition that can't light the LED lamp.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. An LED driving circuit, comprising:
the LED driving module is connected with the LED lamp and used for driving the LED lamp to work;
the current detection module is connected with the LED lamp and used for detecting the working current of the LED lamp;
the control module is connected with the current detection module and used for outputting a control signal according to the working current;
and the voltage regulating module is connected with the control module and the OVP port of the LED driving module and used for lifting the set voltage of the OVP port according to the control signal.
2. The LED driving circuit according to claim 1, wherein the LED driving module includes a driving chip, a first resistor, a second resistor, a third resistor, a first capacitor, and a first diode;
the anode of the first diode is connected with a first input end, the cathode of the first diode is connected with one end of the LED lamp, the other end of the LED lamp is grounded, the first input end is also connected with the voltage input end of the driving chip, and the grounding end of the driving chip is grounded;
the cathode of the first diode is also connected with one end of the first resistor, the other end of the first resistor is connected with one end of the second resistor and the OVP port of the driving chip, and the other end of the second resistor is grounded through the third resistor;
the cathode of the first diode is also connected with one end of the first capacitor, and the other end of the first capacitor is grounded.
3. The LED driving circuit according to claim 1, wherein the current detection module includes a fourth resistor and a fifth resistor;
the LED lamp is connected with the fourth resistor in series and then grounded;
one end of the fourth resistor, which is connected with the LED lamp, is connected with one end of the fifth resistor, and the other end of the fifth resistor is connected with the control module.
4. The LED driving circuit according to claim 1, wherein the control module comprises a control chip and a chip peripheral circuit, a first input/output terminal of the control chip is connected to the current detection module, and a second input/output terminal of the control chip is connected to the voltage regulation module.
5. The LED driving circuit according to claim 2, wherein the voltage regulating module includes a first switching element, a sixth resistor, and a seventh resistor;
one end of the sixth resistor is connected with the control module, and the other end of the sixth resistor is connected with the first pole tube foot of the first switching element;
a second pole pin of the first switching element is grounded, and a third pole pin of the first switching element is connected with the other end of the second resistor;
one end of the seventh resistor is connected with the first pole tube pin of the first switch element, and the other end of the seventh resistor is connected with the second pole tube pin of the first switch element.
6. The LED driving circuit according to claim 5, wherein the first switching element includes any one of a transistor, a MOS transistor, and an IGBT.
7. An LED lamp comprising the LED driving circuit according to any one of claims 1 to 6.
CN202122067047.8U 2021-08-30 2021-08-30 LED drive circuit and LED lamp Active CN216057564U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202122067047.8U CN216057564U (en) 2021-08-30 2021-08-30 LED drive circuit and LED lamp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202122067047.8U CN216057564U (en) 2021-08-30 2021-08-30 LED drive circuit and LED lamp

Publications (1)

Publication Number Publication Date
CN216057564U true CN216057564U (en) 2022-03-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202122067047.8U Active CN216057564U (en) 2021-08-30 2021-08-30 LED drive circuit and LED lamp

Country Status (1)

Country Link
CN (1) CN216057564U (en)

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