CN111083838A - Boost following control circuit and LED driving power supply - Google Patents
Boost following control circuit and LED driving power supply Download PDFInfo
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Abstract
The invention relates to a boost following control circuit and an LED driving power supply. An EMI filter circuit in the boost following control circuit is used for filtering input alternating current, and a rectifying circuit converts the filtered alternating current into direct current; the boost control circuit is used for acquiring a first voltage signal of direct current output by the rectifying circuit and sending a second processed voltage signal to the boost feedback circuit; the boost feedback circuit is used for acquiring the BUCK voltage output by the PFC boost circuit, processing the second voltage signal and the BUCK voltage by the boost feedback circuit and sending a third voltage signal obtained by processing to the PFC control circuit; the PFC control circuit controls the BUCK voltage output by the PFC boost circuit according to the third voltage signal. The invention can ensure that the boosted BUCK voltage changes in a certain range along with the input voltage, solves the index requirements of the global LED driving power supply on the full voltage range (90-305Vac) power factor and THD, reduces the design risk, and improves the reliability and the service life of the product.
Description
Technical Field
The invention relates to the field of LED driving power supplies, in particular to a boost following control circuit and an LED driving power supply.
Background
With the further globalization, the LED driving power supply is required to meet the global input voltage of 90-305Vac, the PF value and the THD of the power supply are reduced in the maximum input voltage section in a wide input voltage range, the conversion efficiency is low in the minimum input voltage section, the temperature of a device is high, and the performance and the reliability of a product are directly influenced.
The conventional PFC circuit is mostly realized by adopting a BOOST topology structure, the BUCK voltage boosted by the BOOST topology structure is a fixed value, and if the maximum input voltage 305Vac power factor value is to be met, the boosted BUCK voltage is to reach more than 440Vdc (305 × 1.414+10 ═ 441), and the electrolytic capacitor is easy to be damaged when reaching the design limit value because the cost and the pressure of the space are 450V selected from the BUCK electrolytic capacitor. Meanwhile, when the minimum voltage is input into 90Vac, the boosted voltage is too high, so that the stress of a power switch device for realizing conversion is higher and the energy requirement of PFC (power factor correction) inductance storage is higher during voltage conversion, thereby increasing the overall design cost and space of the power supply and influencing the overall service life of the power supply. The conventional PFC circuit cannot satisfy the conventional requirements.
Disclosure of Invention
The present invention provides a boost-follow control circuit and an LED driving power supply, aiming at the above-mentioned defects in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a boost following control circuit is constructed and comprises an EMI filter circuit, a rectifying circuit, a PFC boost circuit, a boost control circuit, a boost feedback circuit and a PFC control circuit;
the input end of the EMI filter circuit is connected with an alternating current power supply end, the output end of the EMI filter circuit is connected with the input end of the rectifier circuit, the output end of the rectifier circuit is connected with the input end of the PFC booster circuit, and the output end of the PFC booster circuit outputs BUCK voltage; the input end of the boost control circuit is connected with the output end of the rectification circuit, the output end of the boost control circuit is connected with the first input end of the boost feedback circuit, the output end of the PFC boost circuit is connected with the second input end of the boost feedback circuit, the output end of the boost feedback circuit is connected with the PFC control circuit, and the output end of the PFC control circuit is connected with the PFC boost circuit;
the EMI filter circuit is used for filtering input alternating current, and the rectifier circuit is used for converting the filtered alternating current into direct current; the boost control circuit is used for acquiring a first voltage signal of direct current output by the rectifying circuit and sending a processed second voltage signal to the boost feedback circuit; the boost feedback circuit is used for acquiring the BUCK voltage output by the PFC boost circuit, processing the second voltage signal and the BUCK voltage by the boost feedback circuit and sending a third voltage signal obtained by processing to the PFC control circuit; and the PFC control circuit controls the BUCK voltage output by the PFC boost circuit according to the third voltage signal.
Further, in the boost following control circuit of the present invention, the boost control circuit includes a voltage dividing circuit, a transistor Q9, a capacitor C2, a resistor R8;
the input end of the voltage division circuit is connected with the output end of the rectifying circuit, the first output end of the voltage division circuit is grounded, the second output end of the voltage division circuit is connected with the base electrode of the triode Q9, the base electrode of the triode Q9 is grounded through the capacitor C2, the emitter electrode of the triode Q9 is grounded through the resistor R8, and the collector electrode of the triode Q9 is connected with the first input end of the voltage boosting feedback circuit.
Further, in the boost following control circuit of the present invention, the voltage dividing circuit includes a resistor R4, a resistor R5, a resistor R6, a resistor R7, and a zener diode ZD 1;
a first end of the resistor R4 is connected with an output end of the rectifying circuit, a second end of the resistor R4 is connected with a first end of the resistor R7 through the resistor R6, a second end of the resistor R7 is connected with a negative electrode of the zener diode ZD1, and a positive electrode of the zener diode ZD1 is grounded through the resistor R5; the base electrode of the triode Q9 is connected with the anode of the zener diode ZD 1;
the resistor R4, the resistor R5, the resistor R6 and the resistor R7 are connected in series to divide voltage, a first voltage signal at the output end of the rectifying circuit changes along with the voltage change of the alternating current power supply end, so that the voltage on the resistor R5 changes along with the voltage change of the alternating current power supply end, synchronous detection of the voltage change of the alternating current power supply end is achieved, and the triode Q9 adjusts the conducting state according to the voltage on the resistor R5.
Further, in the boost following control circuit of the present invention, the boost feedback circuit includes a resistor R2, a resistor R9, a resistor R10, a resistor R24, and a capacitor C1;
a first end of the resistor R2 is connected to an output end of the PFC boost circuit, a second end of the resistor R2 is connected to a first end of the resistor R10 through the resistor R9, and a second end of the resistor R10 is connected to a collector of the transistor Q9; the second end of the resistor R10 is grounded through the resistor R24, and the second end of the resistor R10 is grounded through the capacitor C1;
the resistor RQ9 of the triode Q9 is connected with the resistor R24 in parallel and then connected with the resistor R2, the resistor R9 and the resistor R10 in series to divide voltage, and the voltage divided by the resistor RQ9 connected with the resistor R24 in parallel is input to the PFC control circuit.
Further, in the boost following control circuit of the present invention, the PFC control circuit is a PFC control chip, and the PFC control chip is an NCL2801 chip;
pin 1 of the PFC control chip is connected with the second end of the resistor R10; the voltage divided by the resistor RQ9 and the resistor R24 after being connected in parallel is input to a pin 1 of the PFC control chip, and the PFC control chip controls the BUCK voltage output by the PFC boost circuit according to the received voltage.
Further, in the boost following control circuit of the present invention, the PFC boost circuit includes a low pass filter LF2, a MOS transistor Q1, a diode D1, and an electrolytic capacitor CE 1;
the grid electrode of the MOS tube Q1 is connected with a pin 7 of the PFC control chip, the source electrode of the MOS tube Q1 is grounded, the drain electrode of the MOS tube Q1 is connected with the anode of the diode D1, the cathode of the diode D1 outputs the BUCK voltage, and the cathode of the diode D1 is grounded through the electrolytic capacitor CE 1; the anode of the diode D1 is connected to the output end of the low-pass filter LF2, and the input end of the low-pass filter LF2 is connected to the output end of the rectifier circuit.
Further, in the boost following control circuit of the present invention, the PFC boost circuit further includes a capacitor CBB1 and a resistor R1;
the source of the MOS transistor Q1 is grounded through the resistor R1, and the input of the low-pass filter LF2 is grounded through the capacitor CBB 1.
Further, in the boost following control circuit of the present invention, the EMI filter circuit includes a low pass filter LF1 and a capacitor CX 1;
a first input end and a second input end of the low-pass filter LF1 are respectively connected with an L pole and an N pole of an alternating current power supply end, and two ends of the capacitor CX1 are respectively connected with a first output end and a second output end of the low-pass filter LF 1; and the first output end and the second output end of the low-pass filter LF1 are connected with the input end of the rectifying circuit.
Further, in the boost follow-up control circuit of the present invention, the rectifier circuit is a diode rectifier circuit.
In addition, the invention also provides an LED driving power supply which comprises the boost following control circuit.
The boost following control circuit and the LED driving power supply have the following beneficial effects: the invention can ensure that the boosted BUCK voltage changes in a certain range along with the input voltage, solves the index requirements of the global LED driving power supply on the full voltage range (90-305Vac) power factor and THD, reduces the design risk, and improves the reliability and the service life of the product.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic structural diagram of a boost follower control circuit according to an embodiment;
fig. 2 is a circuit diagram of a boost follower control circuit according to an embodiment.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Examples
Referring to fig. 1, the boost follow control circuit of the present embodiment includes an EMI filter circuit 10, a rectifier circuit 20, a PFC boost circuit 30, a boost control circuit 40, a boost feedback circuit 50, and a PFC control circuit 60, wherein an input end of the EMI filter circuit 10 is connected to an ac power supply end, an output end of the EMI filter circuit 10 is connected to an input end of the rectifier circuit 20, an output end of the rectifier circuit 20 is connected to an input end of the PFC boost circuit 30, and an output end of the PFC boost circuit 30 outputs a BUCK voltage; the input end of the boost control circuit 40 is connected with the output end of the rectification circuit 20, the output end of the boost control circuit 40 is connected with the first input end of the boost feedback circuit 50, the output end of the PFC boost circuit 30 is connected with the second input end of the boost feedback circuit 50, the output end of the boost feedback circuit 50 is connected with the PFC control circuit 60, and the output end of the PFC control circuit 60 is connected with the PFC boost circuit 30;
the EMI filter circuit 10 is used for filtering input alternating current, and the rectifier circuit 20 converts the filtered alternating current into direct current; the boost control circuit 40 is configured to acquire a first voltage signal of the direct current output by the rectification circuit 20, and send a second processed voltage signal to the boost feedback circuit 50; the boost feedback circuit 50 is configured to acquire the BUCK voltage output by the PFC boost circuit 30, and the boost feedback circuit 50 processes the second voltage signal and the BUCK voltage and sends a processed third voltage signal to the PFC control circuit 60; the PFC control circuit 60 controls the BUCK voltage output from the PFC boost circuit 30 according to the third voltage signal.
According to the embodiment, the boosted BUCK voltage can change within a certain range along with the input voltage, the index requirements of a global LED driving power supply on the full-voltage range power factor and the THD are met, meanwhile, the design risk is reduced, and the reliability and the service life of the product are improved.
Examples
Referring to fig. 2, on the basis of the previous embodiment, in the boost follow control circuit of the present embodiment, the boost control circuit 40 includes a voltage dividing circuit, a transistor Q9, a capacitor C2, and a resistor R8, an input end of the voltage dividing circuit is connected to an output end of the rectifying circuit 20, a first output end of the voltage dividing circuit is grounded, a second output end of the voltage dividing circuit is connected to a base of the transistor Q9, a base of the transistor Q9 is grounded through a capacitor C2, an emitter of the transistor Q9 is grounded through a resistor R8, and a collector of the transistor Q9 is connected to a first input end of the boost feedback circuit 50.
The voltage division circuit in the boost follow control circuit of the embodiment comprises a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a zener diode ZD1, wherein a first end of the resistor R4 is connected with the output end of the rectifying circuit 20, a second end of the resistor R4 is connected with a first end of the resistor R7 through a resistor R6, a second end of the resistor R7 is connected with the negative electrode of the zener diode ZD1, and the positive electrode of the zener diode ZD1 is grounded through a resistor R5; the base of the transistor Q9 is connected to the anode of the zener diode ZD 1. The resistor R4, the resistor R5, the resistor R6 and the resistor R7 are connected in series to divide voltage, a first voltage signal at the output end of the rectifying circuit 20 changes along with the voltage change of the alternating current power supply end, so that the voltage on the resistor R5 changes along with the voltage change of the alternating current power supply end, synchronous detection of the voltage change of the alternating current power supply end is achieved, and the triode Q9 adjusts the conducting state according to the voltage on the resistor R5.
The boost feedback circuit 50 in the boost follow control circuit of the present embodiment includes a resistor R2, a resistor R9, a resistor R10, a resistor R24, and a capacitor C1, wherein a first end of the resistor R2 is connected to the output end of the PFC boost circuit 30, a second end of the resistor R2 is connected to a first end of the resistor R10 through a resistor R9, and a second end of the resistor R10 is connected to the collector of the transistor Q9; the second terminal of the resistor R10 is grounded through a resistor R24, and the second terminal of the resistor R10 is grounded through a capacitor C1. The resistor RQ9 of the triode Q9 is connected with the resistor R24 in parallel and then connected with the resistor R2, the resistor R9 and the resistor R10 in series to divide voltage, and the divided voltage is input to the PFC control circuit 60 after the resistor RQ9 is connected with the resistor R24 in parallel.
In the boost follow control circuit of the present embodiment, the PFC control circuit 60 is a PFC control chip, and the PFC control chip is an NCL2801 chip. Pin 1 of the PFC control chip is connected with the second end of the resistor R10; the voltage divided by the resistor RQ9 and the resistor R24 after being connected in parallel is input to the pin 1 of the PFC control chip, and the PFC control chip controls the BUCK voltage output by the PFC boost circuit 30 according to the received voltage.
The PFC boost circuit 30 in the boost follow control circuit of the present embodiment includes a low pass filter LF2, a MOS transistor Q1, a diode D1, and an electrolytic capacitor CE1, a gate of the MOS transistor Q1 is connected to a pin 7 of the PFC control chip, a source of the MOS transistor Q1 is grounded, a drain of the MOS transistor Q1 is connected to an anode of the diode D1, a cathode of the diode D1 outputs a BUCK voltage, and a cathode of the diode D1 is grounded through the electrolytic capacitor CE 1; the anode of the diode D1 is connected to the output terminal of the low-pass filter LF2, and the input terminal of the low-pass filter LF2 is connected to the output terminal of the rectifier circuit 20.
The PFC boost circuit 30 in the boost follow control circuit of this embodiment further includes a capacitor CBB1 and a resistor R1, the source of the MOS transistor Q1 is grounded through the resistor R1, and the input terminal of the low-pass filter LF2 is grounded through the capacitor CBB 1.
The EMI filter circuit 10 in the boost follow-up control circuit of this embodiment includes a low-pass filter LF1 and a capacitor CX1, wherein a first input terminal and a second input terminal of the low-pass filter LF1 are respectively connected to an L pole and an N pole of an ac power supply terminal, and two ends of the capacitor CX1 are respectively connected to a first output terminal and a second output terminal of the low-pass filter LF 1; the first output terminal and the second output terminal of the low-pass filter LF1 are connected to the input terminal of the rectifier circuit 20.
The working principle of the embodiment is as follows:
the alternating current is filtered by a low-pass filter LF1 and then is input into the input end of the rectifying circuit, and the alternating current is rectified and then outputs direct current. The series resistor R4, the resistor R6, the resistor R7, the voltage regulator ZD1 and the resistor R5 divide the voltage to detect the dc voltage output by the rectifier circuit 20, that is, the series resistor R4, the resistor R6, the resistor R7, the voltage regulator ZD1 and the resistor R5 divide the voltage to detect the input AC voltage, so that when the AC voltage changes, the dc voltage output by the rectifier circuit 20 changes along with the change of the AC voltage, and further the detection voltage on the resistor R5 changes along with the change of the AC voltage; alternatively, the alternating current AC is mains AC. The detection voltage on the resistor R5 controls the conduction state of the triode Q9, so that the BUCK voltage passing through the PFC booster circuit and the rectified AC mains supply AC voltage are in a linear relation in a certain range, and the BUS voltage is a dynamic value which changes linearly in a certain range. In this embodiment, the voltage across the resistor R5 is a detection voltage, when the AC mains supply AC changes, the detection voltage across the resistor R5 changes, so that the base current of the transistor Q9 changes, the transistor Q9 is enabled to operate in a linear amplification state, an off state and a complete on state by selecting and setting reasonable peripheral element parameters, the transistor Q9 presents different impedances (the impedance is set to be RQ9) in different operating states, the transistor Q9 is connected in series with the resistor R8 and then connected in parallel with the resistor R24, the parallel resistor is connected in series with the resistor R2, the resistor R9 and the resistor R10 to divide the voltage, and the divided voltage is transmitted to the pin 1 of the PFC control chip, and the PFC control chip controls the PFC boost circuit to output the BUCK voltage.
Further, the BUCK voltage output by the FPC boost circuit can be expressed by the formula:
VPFC＝VFB*(R2+R9+R10)/{R24*(RQ9+R8)/(R24+RQ9+R8)}
where VFB is a reference voltage, and R2, R9, R10, R24, and R8 are fixed-value resistors corresponding to the resistors, it can be understood that VPFC and RQ9 have a variation relationship within a certain range.
The rectifying circuit 20 in the boost follow control circuit of the present embodiment is a diode rectifying circuit, that is, a diode 1 in the figure rectifies current, and the diode rectifying circuit includes four diodes. Alternatively, other rectifying circuits may be used to convert ac power to dc power.
The embodiment can ensure that the boosted BUCK voltage changes within a certain range along with the input voltage, solves the index requirements of the global LED driving power supply on the full voltage range (90-305Vac) power factor and THD, reduces the design risk, and improves the reliability and the service life of the product.
Examples
The embodiment also provides an LED driving power supply which comprises the boost following control circuit.
The embodiment can ensure that the boosted BUCK voltage changes within a certain range along with the input voltage, solves the index requirements of the global LED driving power supply on the full voltage range (90-305Vac) power factor and THD, reduces the design risk, and improves the reliability and the service life of the product.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (10)
1. A boost following control circuit is characterized by comprising an EMI filter circuit (10), a rectification circuit (20), a PFC boost circuit (30), a boost control circuit (40), a boost feedback circuit (50) and a PFC control circuit (60);
the input end of the EMI filter circuit (10) is connected with an alternating current power supply end, the output end of the EMI filter circuit (10) is connected with the input end of the rectifier circuit (20), the output end of the rectifier circuit (20) is connected with the input end of the PFC boost circuit (30), and the output end of the PFC boost circuit (30) outputs BUCK voltage; the input end of the boost control circuit (40) is connected with the output end of the rectifying circuit (20), the output end of the boost control circuit (40) is connected with the first input end of the boost feedback circuit (50), the output end of the PFC boost circuit (30) is connected with the second input end of the boost feedback circuit (50), the output end of the boost feedback circuit (50) is connected with the PFC control circuit (60), and the output end of the PFC control circuit (60) is connected with the PFC boost circuit (30);
the EMI filter circuit (10) is used for filtering input alternating current, and the rectifying circuit (20) converts the filtered alternating current into direct current; the boost control circuit (40) is used for acquiring a first voltage signal of direct current output by the rectifying circuit (20) and sending a second processed voltage signal to the boost feedback circuit (50); the boost feedback circuit (50) is used for acquiring the BUCK voltage output by the PFC boost circuit (30), and the boost feedback circuit (50) processes the second voltage signal and the BUCK voltage and sends a processed third voltage signal to the PFC control circuit (60); the PFC control circuit (60) controls the BUCK voltage output by the PFC boost circuit (30) according to the third voltage signal.
2. The boost follow control circuit according to claim 1, wherein the boost control circuit (40) comprises a voltage divider circuit, a transistor Q9, a capacitor C2, a resistor R8;
the input end of the voltage division circuit is connected with the output end of the rectifying circuit (20), the first output end of the voltage division circuit is grounded, the second output end of the voltage division circuit is connected with the base electrode of the triode Q9, the base electrode of the triode Q9 is grounded through the capacitor C2, the emitter electrode of the triode Q9 is grounded through the resistor R8, and the collector electrode of the triode Q9 is connected with the first input end of the boosting feedback circuit (50).
3. The boost follow control circuit according to claim 2, wherein the voltage dividing circuit comprises a resistor R4, a resistor R5, a resistor R6, a resistor R7, a zener diode ZD 1;
a first end of the resistor R4 is connected with an output end of the rectifying circuit (20), a second end of the resistor R4 is connected with a first end of the resistor R7 through the resistor R6, a second end of the resistor R7 is connected with a negative electrode of the zener diode ZD1, and a positive electrode of the zener diode ZD1 is grounded through the resistor R5; the base electrode of the triode Q9 is connected with the anode of the zener diode ZD 1;
the resistor R4, the resistor R5, the resistor R6 and the resistor R7 are connected in series to divide voltage, a first voltage signal at the output end of the rectifying circuit (20) changes along with the voltage change of the alternating current power supply end, so that the voltage on the resistor R5 changes along with the voltage change of the alternating current power supply end, synchronous detection of the voltage change of the alternating current power supply end is achieved, and the triode Q9 adjusts the conducting state according to the voltage on the resistor R5.
4. The boost follow control circuit according to claim 3, wherein the boost feedback circuit (50) comprises a resistor R2, a resistor R9, a resistor R10, a resistor R24, a capacitor C1;
a first end of the resistor R2 is connected with an output end of the PFC boost circuit (30), a second end of the resistor R2 is connected with a first end of the resistor R10 through the resistor R9, and a second end of the resistor R10 is connected with a collector of the triode Q9; the second end of the resistor R10 is grounded through the resistor R24, and the second end of the resistor R10 is grounded through the capacitor C1;
the resistor RQ9 of the triode Q9 is connected with the resistor R24 in parallel and then connected with the resistor R2, the resistor R9 and the resistor R10 in series to divide voltage, and the voltage divided by the resistor RQ9 connected with the resistor R24 in parallel is input into the PFC control circuit (60).
5. The boost follow control circuit according to claim 4, wherein the PFC control circuit (60) is a PFC control chip, the PFC control chip being a NCL2801 chip;
pin 1 of the PFC control chip is connected with the second end of the resistor R10; the voltage divided by the resistor RQ9 and the resistor R24 after being connected in parallel is input to a pin 1 of the PFC control chip, and the PFC control chip controls the BUCK voltage output by the PFC boost circuit (30) according to the received voltage.
6. The boost-follow control circuit according to claim 5, wherein the PFC boost circuit (30) comprises a low-pass filter LF2, a MOS transistor Q1, a diode D1, an electrolytic capacitor CE 1;
the grid electrode of the MOS tube Q1 is connected with a pin 7 of the PFC control chip, the source electrode of the MOS tube Q1 is grounded, the drain electrode of the MOS tube Q1 is connected with the anode of the diode D1, the cathode of the diode D1 outputs the BUCK voltage, and the cathode of the diode D1 is grounded through the electrolytic capacitor CE 1; the anode of the diode D1 is connected with the output end of the low-pass filter LF2, and the input end of the low-pass filter LF2 is connected with the output end of the rectifying circuit (20).
7. The boost-follower control circuit of claim 6, wherein the PFC boost circuit (30) further comprises a capacitor CBB1, a resistor R1;
the source of the MOS transistor Q1 is grounded through the resistor R1, and the input of the low-pass filter LF2 is grounded through the capacitor CBB 1.
8. The boost-follower control circuit according to claim 1, wherein the EMI filter circuit (10) comprises a low-pass filter LF1, a capacitance CX 1;
a first input end and a second input end of the low-pass filter LF1 are respectively connected with an L pole and an N pole of an alternating current power supply end, and two ends of the capacitor CX1 are respectively connected with a first output end and a second output end of the low-pass filter LF 1; the first output end and the second output end of the low-pass filter LF1 are connected with the input end of the rectifying circuit (20).
9. The boost-follow control circuit according to claim 1, wherein the rectifying circuit (20) is a diode rectifying circuit.
10. An LED driving power supply comprising the boost follow control circuit according to any one of claims 1 to 9.
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| CN201911293409.6A CN111083838A (en) | 2019-12-16 | 2019-12-16 | Boost following control circuit and LED driving power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111490691A (en) * | 2020-05-21 | 2020-08-04 | 四川虹美智能科技有限公司 | Adaptive boosting apparatus and method |
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| US20180035500A1 (en) * | 2016-07-28 | 2018-02-01 | Lumileds Llc | Dimming led circuit augmenting dc/dc controller integrated circuit |
| CN110493922A (en) * | 2019-08-28 | 2019-11-22 | 厦门亚锝电子科技有限公司 | A kind of LED drive circuit of the low ripple without stroboscopic |
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Application publication date: 20200428 |