CN209861220U - LED drive circuit capable of inhibiting stroboflash - Google Patents
LED drive circuit capable of inhibiting stroboflash Download PDFInfo
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- CN209861220U CN209861220U CN201920243354.7U CN201920243354U CN209861220U CN 209861220 U CN209861220 U CN 209861220U CN 201920243354 U CN201920243354 U CN 201920243354U CN 209861220 U CN209861220 U CN 209861220U
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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]
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Abstract
The utility model discloses a LED drive circuit capable of inhibiting stroboscopic, which comprises a rectifier bridge, a linear constant current LED driver, an LED load, a sampling circuit, a current amplifying circuit and a current clamping circuit; the sampling circuit is used for collecting direct current components contained in input current flowing into the LED load, the current amplification circuit is used for amplifying the direct current components collected by the sampling circuit to obtain a direct current amplification signal, and the current clamping circuit is used for clamping current flowing through the LED load according to the direct current amplification signal. The utility model discloses can the clamper current of flowing through the LED load to can restrain the stroboscopic of LED load.
Description
Technical Field
The utility model relates to a LED drive circuit especially indicates a can restrain stroboscopic LED drive circuit.
Background
LEDs are typically current mode devices, and the ideal power supply is constant current. As shown in fig. 1, the conventional LED driving circuit includes: rectifier bridge 1, linear constant current LED driver 2, filter capacitor C4 and LED load 3. Wherein the LED load 3 is connected in parallel with a filter capacitor C4. And the output of general linear constant current LED driver 2 can contain the power frequency ripple component, and consider the problem of power factor, filter capacitor C4 can not choose the electric capacity of big capacitance value for use, this makes the electric current that flows through LED load 3 contain the ripple, the electric current that flows through LED load 3 promptly is invariable, thereby make the light of LED load 3 output can have stroboscopic problem, and human eyes can be damaged to higher stroboscopic, also can influence LED's luminous efficacy and luminous color, shorten LED's life.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a can restrain stroboscopic LED drive circuit, it can restrain the stroboscopic of LED load.
In order to achieve the above purpose, the solution of the present invention is:
an LED drive circuit capable of inhibiting stroboflash comprises a rectifier bridge, a linear constant-current LED driver, an LED load, a sampling circuit, a current amplification circuit and a current clamping circuit; the sampling circuit is used for collecting direct current components contained in input current flowing into the LED load, the current amplifying circuit is used for amplifying the direct current components collected by the sampling circuit to obtain a direct current amplifying signal, and the current clamping circuit is used for clamping current flowing through the LED load according to the direct current amplifying signal; the input side of the rectifier bridge is connected with an alternating current source, the output anode of the rectifier bridge is connected with the current setting end of the linear constant-current LED driver and the input end of the LED load, and the output cathode of the rectifier bridge is grounded; the input end of the sampling circuit is connected with the input end of the LED load, the output end of the sampling circuit is connected with the input end of the current amplifying circuit, the output end of the current amplifying circuit is connected with the bias control end of the current clamping circuit, the input end of the current clamping circuit is connected with the output end of the LED load, and the output end of the current clamping circuit is connected with the current input end of the linear constant-current LED driver.
The sampling circuit comprises a capacitor C3, a voltage stabilizing diode ZD2 and a resistor R6, one end of the capacitor C3 is connected with the negative electrode of the voltage stabilizing diode ZD2 and one end of the resistor R6, the positive electrode of the voltage stabilizing diode ZD2 and the other end of the resistor R6 are connected with the current input end of the linear constant-current LED driver, the other end of the capacitor C3 is the input end of the sampling circuit, and the common end of the capacitor C3, the voltage stabilizing diode ZD2 and the resistor R6 is the output end of the sampling circuit.
The current amplifying circuit is a current amplifier.
The current clamping circuit comprises a triode Q1, a triode Q1 is a PNP type triode, an emitter of a triode Q1 is an input end of the current clamping circuit, a base of the triode Q1 is a bias control end of the current clamping circuit, and a collector of the triode Q1 is an output end of the current clamping circuit.
After the technical scheme is adopted, the utility model discloses a sampling circuit, current amplification circuit and current clamp circuit can carry out the clamper to the electric current of flowing through the LED load to make the electric current of flowing through the LED load invariable stroboscopic in order to restrain the LED load.
Drawings
Fig. 1 is a schematic circuit diagram of a conventional LED driving circuit;
fig. 2 is a schematic circuit diagram of the present invention.
Detailed Description
In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following embodiments.
As shown in fig. 2, the present invention discloses an LED driving circuit capable of suppressing stroboscopic phenomenon, which includes a rectifier bridge 1, a linear constant current LED driver 2, an LED load 3, a sampling circuit 4, a current amplifying circuit 5 and a current clamping circuit 6; the sampling circuit 4 is configured to collect a dc component contained in an input current input to the LED load 3, the current amplifying circuit 5 is configured to amplify the dc component collected by the sampling circuit to obtain a dc amplified signal, and the current clamping circuit 6 is configured to clamp a current flowing through the LED load 3 according to the dc amplified signal; the input side of the rectifier bridge 1 is connected with an alternating current source, the output anode of the rectifier bridge 1 is connected with the current setting end of the linear constant-current LED driver 2 and the input end of the LED load 3, and the output cathode of the rectifier bridge 1 is grounded; the input end of the sampling circuit 4 is connected with the input end of the LED load 3, the linear constant-current LED driver 2 can adopt a linear constant-current driving circuit based on an integrated constant-current control IC, and the current flowing into the current input end of the linear constant-current LED driver 2 is controlled by the voltage input from the current setting end so as to realize constant current; the output end of the sampling circuit 4 is connected with the input end of the current amplifying circuit 5, the output end of the current amplifying circuit 5 is connected with the bias control end of the current clamping circuit 6, the input end of the current clamping circuit 6 is connected with the output end of the LED load 3, and the output end of the current clamping circuit 6 is connected with the current input end of the linear constant-current LED driver 2.
Specifically, as shown in fig. 2, the sampling circuit 4 includes a capacitor C3, a zener diode ZD2, and a resistor R6, one end of the capacitor C3 is connected to a negative electrode of the zener diode ZD2 and one end of the resistor R6, an anode of the zener diode ZD2 and the other end of the resistor R6 are connected to a current input terminal of the linear constant-current LED driver, the other end of the capacitor C3 is an input terminal of the sampling circuit 4, and a common terminal of the capacitor C3, the zener diode ZD2, and the resistor R6 is an output terminal of the sampling circuit 4. The current amplifying circuit 5 is a current amplifier, which is a conventional circuit and will not be described herein. The current clamping circuit 6 comprises a triode Q1, the triode Q1 is a PNP type triode, an emitter of the triode Q1 is an input end of the current clamping circuit 6, a base of the triode Q1 is a bias control end of the current clamping circuit 6, and a collector of the triode Q1 is an output end of the current clamping circuit 6.
For easy understanding the utility model discloses, following explanation the utility model discloses a theory of operation:
a direct current component contained in an input current to the LED load 3 is taken out through a capacitor C3, a zener diode ZD2, and a resistor R6 of the sampling circuit 4; then, a current amplifying circuit 5 amplifies the direct current component collected by the sampling circuit to obtain a direct current amplifying signal, the direct current amplifying signal is input to a base electrode of a triode Q1, under the action of a triode Q1, the current of an emitting electrode of a triode Q1 is beta times of the current of the base electrode of the triode Q1, beta is an amplification factor of the triode Q1, the current of a base electrode of a triode Q1 is the direct current amplifying signal, and thus the current of the base electrode of a triode Q1 is a constant value, so that the current of the emitting electrode of the triode Q1 is a constant value, and the current of the emitting electrode of the triode Q1 is clamped; the current of the emitter of the transistor Q1 is the current flowing through the LED load, so that the transistor Q1 clamps the current flowing through the LED load 3 according to the dc amplified signal, and the output current of the collector of the transistor Q1 flows into the linear constant current LED driver 2 from the current input terminal of the linear constant current LED driver, so that the current flowing through the LED load is constant to suppress the stroboscopic of the LED load 3.
In summary, the present invention clamps the current flowing through the LED load 3 through the sampling circuit 4, the current amplifying circuit 5 and the current clamping circuit 6, so that the current flowing through the LED load is constant to suppress the stroboflash of the LED load 3.
The above embodiments and drawings are not intended to limit the form and style of the present invention, and any suitable changes or modifications made by those skilled in the art should not be construed as departing from the scope of the present invention.
Claims (4)
1. An LED drive circuit capable of inhibiting stroboflash comprises a rectifier bridge, a linear constant-current LED driver and an LED load; the method is characterized in that: the sampling circuit, the current amplifying circuit and the current clamping circuit are also included; the sampling circuit is used for collecting direct current components contained in input current flowing into the LED load, the current amplifying circuit is used for amplifying the direct current components collected by the sampling circuit to obtain a direct current amplifying signal, and the current clamping circuit is used for clamping current flowing through the LED load according to the direct current amplifying signal;
the input side of the rectifier bridge is connected with an alternating current source, the output anode of the rectifier bridge is connected with the current setting end of the linear constant-current LED driver and the input end of the LED load, and the output cathode of the rectifier bridge is grounded; the input end of the sampling circuit is connected with the input end of the LED load, the output end of the sampling circuit is connected with the input end of the current amplifying circuit, the output end of the current amplifying circuit is connected with the bias control end of the current clamping circuit, the input end of the current clamping circuit is connected with the output end of the LED load, and the output end of the current clamping circuit is connected with the current input end of the linear constant-current LED driver.
2. The LED driving circuit for suppressing stroboscopic events as claimed in claim 1, wherein: the sampling circuit comprises a capacitor C3, a voltage stabilizing diode ZD2 and a resistor R6, one end of the capacitor C3 is connected with the negative electrode of the voltage stabilizing diode ZD2 and one end of the resistor R6, the positive electrode of the voltage stabilizing diode ZD2 and the other end of the resistor R6 are connected with the current input end of the linear constant-current LED driver, the other end of the capacitor C3 is the input end of the sampling circuit, and the common end of the capacitor C3, the voltage stabilizing diode ZD2 and the resistor R6 is the output end of the sampling circuit.
3. The LED driving circuit for suppressing stroboscopic events as claimed in claim 1, wherein: the current amplifying circuit is a current amplifier.
4. The LED driving circuit for suppressing stroboscopic events as claimed in claim 1, wherein: the current clamping circuit comprises a triode Q1, a triode Q1 is a PNP type triode, an emitter of a triode Q1 is an input end of the current clamping circuit, a base of the triode Q1 is a bias control end of the current clamping circuit, and a collector of the triode Q1 is an output end of the current clamping circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920243354.7U CN209861220U (en) | 2019-02-26 | 2019-02-26 | LED drive circuit capable of inhibiting stroboflash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920243354.7U CN209861220U (en) | 2019-02-26 | 2019-02-26 | LED drive circuit capable of inhibiting stroboflash |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209861220U true CN209861220U (en) | 2019-12-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920243354.7U Active CN209861220U (en) | 2019-02-26 | 2019-02-26 | LED drive circuit capable of inhibiting stroboflash |
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| Country | Link |
|---|---|
| CN (1) | CN209861220U (en) |
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2019
- 2019-02-26 CN CN201920243354.7U patent/CN209861220U/en active Active
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