CN114205945B - Four-in-one dimming circuit adopting primary side feedback and constant voltage - Google Patents
Four-in-one dimming circuit adopting primary side feedback and constant voltage Download PDFInfo
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- CN114205945B CN114205945B CN202111404677.8A CN202111404677A CN114205945B CN 114205945 B CN114205945 B CN 114205945B CN 202111404677 A CN202111404677 A CN 202111404677A CN 114205945 B CN114205945 B CN 114205945B
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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]
- H05B45/10—Controlling the intensity of the light
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/34—Voltage stabilisation; Maintaining constant 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]
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Abstract
The invention discloses a primary side feedback constant voltage four-in-one dimming circuit, which comprises a first resistor connected with a transformer feedback winding, a control chip, a second resistor, an eleventh resistor, a triode, a third resistor, a voltage follower, a fourth resistor and a fifth resistor, wherein the control chip, the second resistor and the eleventh resistor are connected with the first resistor, the triode is connected with the second resistor, the third resistor is connected with the base electrode of the triode, the voltage follower is connected with the third resistor, the fourth resistor and the fifth resistor are connected with the same-phase input end of the voltage follower, the other end of the fourth resistor is connected with a power supply, the other end of the fifth resistor is connected with a first diode, and the negative electrode of the first diode is connected with a dimming signal. The conduction state of the triode is controlled through the dimming signal of the cathode of the first diode, the electric signal of the feedback pin of the control chip is further adjusted, the control chip controls the energy storage condition of the flyback starting circuit according to the electric signal of the feedback pin, the circuit is simplified, the reduction is saved, and the stability is improved.
Description
Technical Field
The invention relates to the technical field of lamp dimming circuits, in particular to a four-in-one dimming circuit adopting primary side feedback constant voltage.
Background
At present, in the application of the LED lightening engineering lamp strip, silicon controlled rectifier, 0-10V, PWM or linear dimming is generally expected to be adopted for driving. Because the lamp strip adopts the application of the constant voltage and the current limiting resistor, the driving adopts a secondary constant voltage mode, and the dimming adopts a linear change mode of driving output voltage, namely, the size of the output voltage is adjusted. When the silicon controlled rectifier is used for dimming, an input phase-cut signal needs to be fed back to a secondary side through the optical coupler, and an output voltage loop feedback signal needs to be fed back to a primary side through the optical coupler. The circuit is more complicated and the cost is higher.
Disclosure of Invention
The invention aims to solve at least one technical problem in the prior art, and therefore, the invention provides a primary side feedback constant voltage four-in-one dimming circuit which adopts a primary side feedback constant voltage mode, can save two paths of optocouplers, simplifies circuits, reduces the cost and improves the stability.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
according to an embodiment of the first aspect of the present invention, a four-in-one dimming circuit with a primary side feedback constant voltage includes: a transformer, a feedback winding of which is in phase with a secondary winding of the transformer; the flyback power supply circuit is connected with the primary winding of the transformer, and the control chip is connected with the flyback power supply circuit; and the dimming circuit is connected with the transformer feedback winding, and comprises a first resistor connected with the transformer feedback winding, a control chip, a second resistor and an eleventh resistor which are connected with the first resistor, a triode connected with the second resistor, a third resistor connected with a base electrode of the triode, a voltage follower connected with the third resistor, a fourth resistor and a fifth resistor connected with the same-phase input end of the voltage follower, wherein the other end of the fourth resistor is connected with a power supply, the other end of the fifth resistor is connected with a first diode, and a dimming signal is connected with the negative electrode of the first diode.
The primary side feedback constant voltage four-in-one dimming circuit at least has the following beneficial effects: the conduction state of the triode is controlled by the dimming signal of the cathode of the first diode or the second diode, the attenuation proportion (equivalent to the change of the lower resistor) of the FB pin is changed when the voltage of the feedback winding is sampled, the voltage of the feedback winding is in a proportional relation with the output voltage, namely the FB pin indirectly samples the output voltage to realize output voltage stabilization, and the output voltage is adjusted by the dimming signal. Therefore, the optical coupler is saved, the circuit is simplified, the cost is reduced, and the stability is improved.
According to some embodiments of the present invention, the dimming circuit further includes a TL431, a sixth resistor, and a seventh resistor, wherein a non-inverting input terminal of the voltage follower is connected to the K pole of the TL431 and one end of the sixth resistor, the other end of the sixth resistor is connected to the R pole of the TL431 and one end of the seventh resistor, and the other end of the seventh resistor and the a pole of the TL431 are grounded.
According to some embodiments of the invention, the dimming circuit further comprises a second diode, a third diode, a fourth diode and an eighth resistor, wherein an anode of the second diode and an anode of the first diode are connected with each other and are connected with the non-inverting input terminal of the voltage follower through a fifth resistor, a cathode of the second diode is connected with cathodes of the third diode and the fourth diode through the eighth resistor, and anodes of the third diode and the fourth diode are connected with an alternating current power supply.
According to some embodiments of the invention, the apparatus further comprises a resistor-capacitor circuit connected to the cathode of the second diode and the eighth resistor.
According to some embodiments of the invention, the dimming circuit further comprises a tenth resistor, and the base of the triode is grounded through the tenth resistor.
According to some embodiments of the present invention, the flyback primary switch circuit includes a second capacitor, a third capacitor, a twelfth resistor, a thirteenth resistor, a fifth diode, a rectifier bridge, and an MOS transistor, an output end of the rectifier bridge is connected to one end of the second capacitor, one end of the third capacitor, one end of the twelfth resistor, and one end of the primary winding of the transformer, a negative electrode of the fifth diode is connected to the other end of the third capacitor and the other end of the twelfth resistor, the other end of the primary winding of the transformer is connected to an anode of the fifth diode and a drain of the MOS transistor, a source of the MOS transistor is grounded through the thirteenth resistor, and a gate of the MOS transistor is connected to an output end of the control chip.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a circuit schematic of the present invention.
In the figure: 10. a flyback primary side switching circuit; 20. a dimming circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following description will further explain the embodiments of the present invention with reference to the accompanying drawings.
The technical solutions in the embodiments of the present invention will be fully described below, and it should be apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
According to some embodiments, a four-in-one dimming circuit with a primary side feedback constant voltage, as shown in fig. 1, comprises: a transformer T; the flyback starting circuit 10 is connected with a primary winding of the transformer T, and the control chip IC is connected with the flyback starting circuit 10; the dimming circuit 20 is connected with the control chip IC and the feedback winding of the transformer T, the dimming circuit 20 comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a capacitor C1, a TL431, a diode D1, a diode D2, a diode D3, a diode D4, a triode Q1 and a voltage follower U1, one end of the resistor R1 is connected with the output end of the feedback winding of the transformer T, the other end of the resistor R1 is connected with one ends of the resistor R2, the resistor R11 and a feedback pin of the control chip IC, the other end of the resistor R11 is grounded, the other end of the resistor R2 is connected with a collector of the triode Q1, a base of the triode Q1 is grounded through the resistor R10, the resistor R3 is connected with an output end of the voltage follower U1, a non-inverting input end of the voltage follower U1 is connected with a power supply through the resistor R4, the resistor R5 is connected with anodes of the diode D1 and the diode D2, the cathode of the diode D1 is connected with a dimming signal, the cathode of the diode D2 is connected with the resistor C9, the cathode of the capacitor R8 and the resistor R8, and the other end of the resistor R3 are connected with one ends of the diode D3, and the resistor R8, and the diode D3 are connected with the other ends of the diode D1, and the other ends of the diode D3. The non-inverting input end of the voltage follower U1 is further connected with the K pole of the TL431 and one end of the resistor R6, the other end of the sixth resistor R6 is connected with the R pole of the TL431 and one end of the resistor R7, and the other end of the resistor R7 and the a pole of the TL431 are grounded. Further, the flyback starting circuit 10 includes a capacitor C2, a capacitor C3, a resistor R12, a resistor R13, a diode D5, a rectifier bridge D6 and an MOS transistor Q2, wherein an output end of the rectifier bridge D6 is connected to one end of the capacitor C2, the capacitor C3, the resistor R12 and one end of a primary winding of the transformer T, a cathode of the diode D5 is connected to the other ends of the capacitor C3 and the resistor R12, the other end of the primary winding of the transformer T is connected to an anode of the diode D5 and a drain of the MOS transistor Q2, a source of the MOS transistor Q2 is grounded through the resistor R13, and a gate of the MOS transistor Q2 is connected to an output end of the control chip IC.
And the L or N ends in front of the anodes of the diode D3 and the diode D4 are connected with a silicon controlled dimmer.
The working principle of the embodiment is as follows:
as shown, the input voltage passes through the diode D3, the diode D4, the resistor R8, the resistor R9 and the capacitor C1, and then forms an attenuated input average voltage at a point a. And point b is a dimming voltage signal obtained by converting dimming modes such as 0-10V, PWM and linear dimming modes. The diode D1 and the diode D2 function as: which voltage is lower at the point a and the point b, which diode is conducting, i.e. if Va is smaller than Vb, then the voltage at the point c is Va + VD2, i.e. which dimming is larger and which dimming is active. The resistor R6, the resistor R7 and the TL431 have the function that when the voltage Va and the voltage Vb are large, namely when dimming is not carried out on two sides, the voltage Vd is stabilized at one voltage. The voltage follower U1 has the function of isolating the dimming signal from the base signal of the triode Q1, so that the anti-interference capability is improved. When the dimming is not performed, the Vd voltage is maximum and limited at a fixed value, and is applied to the base of the triode Q1 through the voltage follower U1 and then the resistor R3 and the resistor R10 to form a base current IB, wherein the IB is fixed at the maximum value. When dimming is minimal, vd is minimal, at which point IB is substantially zero and transistor Q1 is turned off. When Ve is to reach Vref, which controls the Error Amplifier (EA) inside the chip IC, when dimming is not performed, vf is larger. Since Vf is proportional to the secondary output voltage (i.e. related to the turn ratio of the feedback winding and the secondary winding), the secondary output voltage is at a maximum. When Vd decreases with dimming, IB also decreases and the output voltage decreases, and when dimming is minimal, the branch of resistor R2 and transistor Q1 is almost completely disconnected, at which time the secondary output voltage is minimal. That is, the secondary output voltage changes in a fixed range, thereby achieving the purpose of constant voltage dimming. The circuit is simple, practical, high in cost performance and very suitable for constant-voltage dimming application.
It will be evident to those skilled in the art that the invention is not limited to the exemplary embodiments described above, but that the present solution is capable of being embodied in other specific forms without departing from the essential characteristics thereof. Accordingly, the embodiments should be considered as exemplary and non-limiting.
Claims (5)
1. The utility model provides an adopt four unification light modulation circuit of former limit feedback constant voltage which characterized in that includes:
a transformer (T) having a feedback winding in phase with a secondary winding of the transformer (T);
the flyback transformer comprises a flyback primary side switch circuit (10) connected with a primary winding of the transformer (T) and a control chip (IC) connected with the flyback primary side switch circuit (10);
the dimming circuit (20) is connected with the control chip (IC) and a feedback winding of the transformer (T), the dimming circuit (20) comprises a first resistor (R1) connected with the feedback winding of the transformer (T), the control chip (IC), a second resistor (R2) and an eleventh resistor (R11) which are connected with the first resistor (R1), a triode (Q1) connected with the second resistor (R2), a third resistor (R3) connected with a base electrode of the triode (Q1), a voltage follower (U1) connected with the third resistor (R3), a fourth resistor (R4) and a fifth resistor (R5) which are connected with a non-inverting input end of the voltage follower (U1), the other end of the fourth resistor (R4) is connected with a power supply, the other end of the fifth resistor (R5) is connected with a first diode (D1), and the negative electrode of the first diode (D1) is connected with a dimming signal;
the dimming circuit (20) further comprises a second diode (D2), a third diode (D3), a fourth diode (D4) and an eighth resistor (R8), the anode of the second diode (D2) is connected with the anode of the first diode (D1) and is connected with the non-inverting input end of the voltage follower (U1) through a fifth resistor (R5), the cathode of the second diode (D2) is connected with the cathodes of the third diode (D3) and the fourth diode (D4) through the eighth resistor (R8), and the anodes of the third diode (D3) and the fourth diode (D4) are connected with an alternating current power supply.
2. The primary-side feedback constant-voltage four-in-one dimming circuit according to claim 1, wherein the dimming circuit (20) further comprises a TL431 (U2), a sixth resistor (R6) and a seventh resistor (R7), a non-inverting input terminal of the voltage follower (U1) is connected to the K pole of the TL431 (U2) and one end of the sixth resistor (R6), the other end of the sixth resistor (R6) is connected to the R pole of the TL431 (U2) and one end of the seventh resistor (R7), and the other end of the seventh resistor (R7) and the a pole of the TL431 (U2) are grounded.
3. The four-in-one dimming circuit with the primary side feedback constant voltage according to claim 1, wherein the dimming circuit (20) further comprises a resistor-capacitor circuit connected with the cathode of the second diode (D2) and the eighth resistor (R8).
4. The primary-side feedback constant-voltage four-in-one dimming circuit according to claim 1, wherein the dimming circuit (20) further comprises a tenth resistor (R10), and the base of the transistor (Q1) is grounded through the tenth resistor (R10).
5. The primary feedback constant voltage four-in-one dimming circuit according to claim 1, wherein the flyback primary switch circuit (10) comprises a second capacitor (C2), a third capacitor (C3), a twelfth resistor (R12), a thirteenth resistor (R13), a fifth diode (D5), a rectifier bridge (D6) and a MOS transistor (Q2), an output end of the rectifier bridge (D6) is connected to one end of the second capacitor (C2), the third capacitor (C3), and the twelfth resistor (R12) and one end of the primary winding of the transformer (T), a cathode of the fifth diode (D5) is connected to the other ends of the third capacitor (C3) and the twelfth resistor (R12), the other end of the primary winding of the transformer (T) is connected to an anode of the fifth diode (D5) and a drain of the MOS transistor (Q2), a source of the MOS transistor (Q2) is grounded through the thirteenth resistor (R13), and a gate of the MOS transistor (Q2) is connected to an output end of the control chip (IC).
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| CN202111404677.8A CN114205945B (en) | 2021-11-24 | 2021-11-24 | Four-in-one dimming circuit adopting primary side feedback and constant voltage |
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