CN111065189A - LED linear constant current circuit with overvoltage detection function and overvoltage detection method - Google Patents
LED linear constant current circuit with overvoltage detection function and overvoltage detection method Download PDFInfo
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- CN111065189A CN111065189A CN201911294446.9A CN201911294446A CN111065189A CN 111065189 A CN111065189 A CN 111065189A CN 201911294446 A CN201911294446 A CN 201911294446A CN 111065189 A CN111065189 A CN 111065189A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The invention discloses an LED linear constant current circuit with an overvoltage detection function, which comprises at least one LED lamp, a feedback loop and an overvoltage protection circuit, wherein the feedback loop is connected with the LED lamp; the invention also discloses an LED lamp overvoltage detection method. The invention abandons the traditional switch power supply, operational amplifier and BJT circuit, reduces the use of EMI/switch voltage peak/special switch power supply chip/high frequency transformer and other chips, thus reducing the hardware cost in the design process; the negative feedback linear LED constant current of the double triodes is adopted, so that the control port resource of a single chip microcomputer is abandoned, the stable self-regulation of the current of the LED lamp is realized, and the development cost is reduced; the working voltage of a negative feedback linear LED constant current circuit of the double triodes is controlled by the self overvoltage protection circuit, so that the overvoltage protection function of the LED lamp is realized.
Description
Technical Field
The invention belongs to the technical field of LED constant current output circuits, and particularly relates to an LED linear constant current circuit with an overvoltage detection function and an overvoltage detection method.
Background
Household appliances, such as a range hood, a steam box, an oven and the like, are often provided with LED atmosphere lamps on display panels, and also illumination lamps used in daily life are generally driven by a constant current power supply; the existing constant current circuit is generally an LED constant current circuit based on a switching power supply, is used in high-power occasions, and has the defects of poor EMI effect, prominent switching peak signal, high circuit cost and the like; still another type is an LED constant current circuit based on operational amplifiers and transistors, which is used in low power applications, but which operates with low efficiency, less than 50%.
In addition, the main methods for the current balance control circuit of the matrix LED in the market generally include: the method is simple in form and only needs one constant current chip; however, the dedicated chip is expensive, and in order to satisfy the functions of the chip, more peripheral circuits and unit machines are required, which results in high hardware cost, excessive detection ports, and large temperature influence on the LED current.
Disclosure of Invention
In order to solve the problems, the invention provides the LED linear constant current circuit with the overvoltage detection function, and through mutual matching between the feedback loop and the overvoltage protection circuit, constant current output is realized, and meanwhile, overvoltage protection is realized on an LED lamp.
The invention further aims to provide an LED lamp overvoltage detection method.
The technical scheme adopted by the invention is as follows:
the utility model provides a linear constant current circuit of LED with overvoltage detection function, its includes LED lamp, feedback loop and overvoltage protection circuit, the LED lamp sets up one at least, feedback loop and LED lamp are connected, overvoltage protection circuit is connected with the LED lamp through feedback loop and is used for carrying out overvoltage detection to the operating voltage of LED lamp.
Preferably, the overvoltage protection circuit comprises a zener diode D1, a cathode of the zener diode D1 is connected to the input voltage VBAT, an anode of the zener diode D1 is connected to the ground through a first resistor R1, the other anode of the zener diode D1 is connected to a base of a second transistor Q2 through a fifth resistor R5, the first resistor R1 and a fourth capacitor C4 are connected to the ground in parallel, an emitter of the second transistor Q2 and the first resistor R1 are connected to the ground in common, and a collector of the second transistor Q2 is connected to the feedback loop.
Preferably, the feedback loop includes a fourth transistor Q4, an emitter of the fourth transistor Q4 is connected to a thirteenth resistor R13, the thirteenth resistor R13 is connected to ground through a sixteenth resistor R16 in one path, the other path is connected to a base of a third transistor Q3 through a twelfth resistor R12, the sixteenth resistor R16 is connected to a fifteenth resistor R15 in parallel, a base of the fourth transistor Q4 is connected to ground through a ninth capacitor C9, an emitter of the third transistor Q3 is connected to an eleventh capacitor C11 in parallel and commonly grounded, a collector of the third transistor Q3 is connected to a base of the fourth transistor Q4 through a tenth resistor R10 in one path, and is connected to the voltage detection circuit in one path, and is connected to a voltage division unit, and the voltage division unit is connected to the LED lamp.
Preferably, the voltage division unit includes a sixth resistor R6, a seventh resistor R7, and a fifth capacitor C5 connected in parallel.
Preferably, any one of the LED lamps is connected with a capacitor for filtering in parallel.
Preferably, the type of the fourth transistor Q4 is: BCX56-16, the model of the third triode Q3 is: BC 817-16.
Preferably, the LED lamp includes a fourth diode D4.
The LED lamp overvoltage detection method applies the LED linear circuit with the overvoltage detection function, and the method specifically comprises the following steps:
when the input voltage is too high, the overvoltage protection circuit controls the LED lamp to be closed through the feedback loop, and overvoltage protection is completed.
Preferably, the overvoltage protection circuit controls the LED lamp to be turned off through a feedback loop, specifically:
when the input voltage VBAT is too high, the zener diode D1 is turned on in a reverse voltage-stabilizing manner, the collector-emitter voltage of the second transistor Q2 is about zero, and the fourth transistor Q4 is turned off, so that the LED lamp is turned off.
Preferably, the method further comprises:
when the input voltage VBAT becomes low, the zener diode D1 is turned off in the reverse direction, the second triode Q2 is turned off, the fourth triode Q4 is turned on again, the LED lamp is turned on, and low-voltage automatic recovery is achieved.
Compared with the prior art, the invention abandons the traditional switching power supply, operational amplifier and BJT circuit, reduces the use of EMI/switching voltage spike/special switching power supply chip/high-frequency transformer and other chips, thereby reducing the hardware cost in the design process; the negative feedback linear LED constant current of the double triodes is adopted, so that the control port resource of a single chip microcomputer is abandoned, the stable self-regulation of the current of the LED lamp is realized, and the development cost is reduced; the working voltage of a negative feedback linear LED constant current circuit of the double triodes is controlled by the self overvoltage protection circuit, so that the overvoltage protection function of the LED lamp is realized.
Drawings
Fig. 1 is a circuit diagram of an LED linear constant current circuit with an overvoltage detection function according to embodiment 1 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 invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "vertical", "lateral", "longitudinal", "front", "rear", "left", "right", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention, and do not mean that the device or member to which the present invention is directed must have a specific orientation or position, and thus, cannot be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
The embodiment 1 of the invention provides an LED linear constant current circuit with an overvoltage detection function, as shown in FIG. 1, the LED linear constant current circuit comprises an LED lamp 1, at least one feedback loop 2 and an overvoltage protection circuit 3, wherein the feedback loop 2 is connected with the LED lamp 1, and the overvoltage protection circuit 3 is connected with the LED lamp 1 through the feedback loop 2 and is used for carrying out overvoltage detection on the working voltage of the LED lamp 1;
thus, by adopting the structure, the constant current output of the LED lamp 1 is realized through the feedback loop 2;
the overvoltage protection and low-voltage automatic recovery of the LED lamp 1 are realized through the arrangement of the overvoltage protection circuit 3.
Specifically, the overvoltage protection circuit 3 includes a zener diode D1, a negative electrode of the zener diode D1 is connected to the input voltage VBAT, an anode of the zener diode is connected to the ground through a first resistor R1, another anode of the zener diode is connected to the base of a second transistor Q2 through a fifth resistor R5, the first resistor R1 and a fourth capacitor C4 are connected to the ground in parallel, an emitter of the second transistor Q2 and the first resistor R1 are connected to the ground in common, and a collector of the second transistor Q2 is connected to the feedback loop 2;
thus, the principle of realizing overvoltage protection and low-voltage automatic recovery by the overvoltage protection circuit 3 is as follows:
overvoltage self-protection principle:
when the input voltage VBAT is too high, the zener diode D1 is reverse voltage-stabilized and conducted; the voltage of the first resistor R1 is:
VR1＝VBAT-VD1 (1)
wherein VBAT is the input voltage of the self-protection circuit 4; VR1 is the voltage of the first resistor R1; VD1 is the reverse conducting voltage drop of Zener diode D1; therefore, when the zener diode D1 is turned on in a reverse voltage-stabilizing manner, the base voltage Vbe _ Q2 of the second transistor Q2 becomes saturated and turned on as VR 1; the collector-emitter voltage Vce _ Q2 of the second triode Q2 is VBAT approximately equal to 0V, so that the third triode Q3 is turned off, and the fourth diode D4 is turned off, thereby realizing overvoltage self-protection;
low-pressure self-recovery principle:
after overvoltage protection, when the input voltage VBAT changes from high to low, the Zener diode D1 is cut off in the reverse direction; VR1 ≈ 0V according to formula (1); the second transistor Q2 is off; the third triode Q3 is turned on again, the fourth diode D4 is turned on, and low voltage automatic recovery is achieved.
The feedback loop 2 comprises a fourth triode Q4, an emitter of the fourth triode Q4 is connected with a thirteenth resistor R13, one path of the thirteenth resistor R13 is grounded through a sixteenth resistor R16, the other path of the thirteenth resistor R13 is connected with a base of a third triode Q3 through a twelfth resistor R12, the sixteenth resistor R16 is connected with a fifteenth resistor R15 in parallel, a base of the fourth triode Q4 is grounded through a ninth capacitor C9, an emitter of the third triode Q3 is connected with an eleventh capacitor C11 in parallel and commonly grounded, one path of a collector of the third triode Q3 is connected with a base of the fourth triode Q4 through a tenth resistor R10, one path of the collector is connected with the voltage detection circuit 3, the other path is connected with the voltage division unit 21, and the voltage division unit 21 is connected with the LED lamp 1;
the voltage dividing unit 21 includes a sixth resistor R6, a seventh resistor R7, and a fifth capacitor C5 connected in parallel.
Thus, the control principle of realizing linear constant current by the feedback loop 2 is as follows:
suppose that the current of the LED lamp (fourth diode D4) suddenly increases, i.e. "ID4↓ "sixteenth resistance R16 voltage VR16≠ → ' third triode Q3 base current Ib _ Q3 ↓ "→ ' third triode Q3 collector current Ic _ Q3 → ' after voltage division by the voltage division unit 21, collector voltage Vc _ Q4 ↓" → ' of the fourth triode Q4 after R10 voltage ↓ "→ ' fourth triode Q4 base current Ib _ Q4 ↓" → ' fourth triode Q4 collector current Ic _ Q4 ↓ "→ ' fourth diode D4(ID4)↓”；
By adding the first capacitor C9, the eleventh capacitor C11 increases the current (I) of the fourth diode D4D4) And the offset of the phase margin, thereby improving the stability of the feedback loop.
Any one LED lamp 1 is connected with a capacitor for filtering in parallel.
The model of the fourth triode Q4 is as follows: BCX56-16, the model of the third triode Q3 is: BC 817-16.
The LED lamp 1 includes a fourth diode D4.
In another embodiment, the LED lamp 1 further comprises a fifth diode D5.
The fourth diode D4 and the fifth diode D5 are connected in parallel with the sixth capacitor C6 and the seventh capacitor C7, respectively, for filtering the fourth diode D4 and the fifth diode D5.
The working principle of the embodiment is as follows:
when the current of the LED lamp 1 is set to pass through the resistance formed by the parallel connection of the fifteenth resistor R15 and the sixteenth resistor R16, the voltage makes the third triode Q3 be conducted and in an amplification state; at this time, the collector electrode current of the third triode Q3 is divided by the voltage dividing unit 21 composed of the sixth resistor R6 and the seventh resistor R7 to obtain a collector-emitter voltage Vce _ Q3 of the third triode Q3, and the fourth triode Q4 is turned on by the tenth resistor R10; the current of the LED lamps D4 and D5 continuously passes through the fourth triode Q4, so that a normal negative feedback linear LED constant current output circuit is established.
The embodiment abandons the traditional switching power supply, an operational amplifier and a BJT circuit, reduces the use of EMI/switching voltage spike/special switching power supply chip/high-frequency transformer and other chips, and reduces the hardware cost in the design process; the negative feedback linear LED constant current of the double triodes is adopted, so that the control port resource of a single chip microcomputer is abandoned, the stable self-regulation of the current of the LED lamp is realized, and the development cost is reduced; the overvoltage protection circuit is adopted to control the working voltage of the negative feedback linear LED constant current circuit of the double triodes, so that the overvoltage protection function and the low-voltage self-recovery function are realized.
Example 2
The embodiment 2 of the invention provides an overvoltage detection method for an LED lamp, which applies the LED linear circuit with the overvoltage detection function described in the embodiment 1, and the method specifically comprises the following steps:
when the input voltage VBAT is too high, the zener diode D1 is reversely regulated and turned on, the collector-emitter voltage of the second triode Q2 is about zero, and further the fourth triode Q4 is turned off, and the LED lamp 1 is turned off;
when the input voltage VBAT becomes low, the zener diode D1 is turned off in the reverse direction, the second triode Q2 is turned off, the fourth triode Q4 is turned on again, the LED lamp 1 is turned on, and low-voltage automatic recovery is realized.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in 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 (10)
1. The utility model provides a linear constant current circuit of LED with overvoltage detection function, its characterized in that, it includes LED lamp (1), feedback loop (2) and overvoltage crowbar (3), LED lamp (1) sets up one at least, feedback loop (2) and LED lamp (1) are connected, overvoltage crowbar (3) are connected with LED lamp (1) through feedback loop (2) and are used for carrying out overvoltage crowbar (r) to the operating voltage of LED lamp (1).
2. The LED linear constant current circuit with the over-voltage detection function as claimed in claim 1, wherein the over-voltage protection circuit (3) comprises a Zener diode D1, the cathode of the Zener diode D1 is connected with the input voltage VBAT, the anode of the Zener diode D1 is connected with the ground through a first resistor R1, the other circuit of the Zener diode D1 is connected with the base of a second triode Q2 through a fifth resistor R5, the first resistor R1 is connected with a fourth capacitor C4 in parallel and is connected with the ground, the emitter of the second triode Q2 is connected with the first resistor R1 in common, and the collector of the second triode Q2 is connected with the feedback loop (2).
3. The LED linear constant current circuit with the overvoltage detection function as claimed in claim 2, characterized in that the feedback loop (2) comprises a fourth transistor Q4, the emitter of the fourth transistor Q4 being connected to a thirteenth resistor R13, one path of the thirteenth resistor R13 is grounded through a sixteenth resistor R16, the other path is connected with the base electrode of a third triode Q3 through a twelfth resistor R12, the sixteenth resistor R16 is connected in parallel with the fifteenth resistor R15, the base of the fourth triode Q4 is grounded through a ninth capacitor C9, an emitting electrode of the third triode Q3 and an eleventh capacitor C11 are connected in parallel and are grounded in common, one path of a collector electrode of the third triode Q3 is connected with a base electrode of the fourth triode Q4 through a tenth resistor R10, one path of the collector electrode is connected with the voltage detection circuit (3), the other path of the collector electrode is connected with the voltage division unit (21), and the voltage division unit (21) is connected with the LED lamp (1).
4. The LED linear constant current circuit with the overvoltage detection function according to claim 3, wherein the voltage division unit (21) comprises a sixth resistor R6, a seventh resistor R7 and a fifth capacitor C5 which are connected in parallel.
5. The LED linear constant current circuit with the overvoltage detection function according to any one of claims 1 to 4, wherein any one of the LED lamps (1) is connected with a capacitor for filtering in parallel.
6. The LED linear constant current circuit with the overvoltage detection function as claimed in claim 3, wherein the fourth triode Q4 is of the following model: BCX56-16, the model of the third triode Q3 is: BC 817-16.
7. The LED linear constant current circuit with the overvoltage detection function as claimed in claim 1, wherein the LED lamp (1) comprises a fourth diode D4.
8. An overvoltage detection method for an LED lamp, which is characterized in that the LED linear circuit with the overvoltage detection function as claimed in any one of claims 1 to 7 is applied, and the method specifically comprises the following steps:
when the input voltage is too high, the overvoltage protection circuit (3) controls the LED lamp (1) to be closed through the feedback loop (2), and overvoltage protection is completed.
9. The method for detecting the overvoltage of the LED lamp according to claim 8, wherein the overvoltage protection circuit (3) controls the LED lamp (1) to be turned off through the feedback loop (2), and specifically comprises:
when the input voltage VBAT is too high, the zener diode D1 is turned on in a reverse voltage-stabilizing manner, the collector-emitter voltage of the second transistor Q2 is about zero, and the fourth transistor Q4 is turned off, so that the LED lamp is turned off.
10. The method of claim 9, further comprising:
when the input voltage VBAT becomes low, the Zener diode D1 is cut off in the reverse direction, the second triode Q2 is closed, the fourth triode Q4 is turned on again, the LED lamp (1) is turned on, and low-voltage automatic recovery is achieved.
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| CN201911294446.9A CN111065189B (en) | 2019-12-16 | 2019-12-16 | LED linear constant current circuit with overvoltage detection function and overvoltage detection method |
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| CN111065189B CN111065189B (en) | 2022-04-26 |
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| CN202049714U (en) * | 2010-12-01 | 2011-11-23 | 国琏电子（上海）有限公司 | Light-emitting diode (LED) driving system |
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