CN109548237B - Centralized and distributed LED integrated power supply system - Google Patents
Centralized and distributed LED integrated power supply system Download PDFInfo
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- CN109548237B CN109548237B CN201811497609.9A CN201811497609A CN109548237B CN 109548237 B CN109548237 B CN 109548237B CN 201811497609 A CN201811497609 A CN 201811497609A CN 109548237 B CN109548237 B CN 109548237B
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- H—ELECTRICITY
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- H—ELECTRICITY
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Abstract
The invention relates to a centralized distributed LED integrated power supply system which comprises a centralized main power supply and a plurality of distributed sub-power supplies, wherein the centralized main power supply comprises a filter circuit, an active power factor correction PFC circuit, a high-frequency inverter circuit, an auxiliary power supply and a main control circuit, the filter circuit is electrically connected with a mains supply, the filter circuit, the active PFC circuit and the high-frequency inverter circuit are sequentially and electrically connected, the active PFC circuit is also electrically connected with the auxiliary power supply, the main control circuit is respectively electrically connected with the auxiliary power supply and the high-frequency inverter circuit, the high-frequency inverter circuit is respectively electrically connected with the sub-power supply circuits, and the sub-power supply circuits are electrically connected with LED lamps in a one-to-one correspondence manner. The invention adopts high-frequency high-voltage power supply to reduce the sectional area of a high-power supply bus and reduce the wiring cost; the adoption of the current interleaving critical mode can improve the efficiency of the active PFC circuit, reduce the noise of the active PFC circuit, ensure that the circuit works in a weak inductive state, reduce the pollution of the LED lighting circuit to a power grid, prolong the service life of a power supply and improve the reliability of the power supply.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a centralized and distributed LED integrated power supply system.
Background
The LED lamp is energy-saving and environment-friendly, has long service life, is a light source with development prospect, is widely used for LED illumination, display, light supplementing and the like, and has larger power and larger application scale. However, the power supply for supplying power to the LED light source has poor reliability and low efficiency, so that the LED light source is energy-saving and not cost-saving, and the wide application of the LED light source is severely restricted.
At present, the power supply of the LED lamp mainly has two modes, namely a centralized and distributed power supply mode of a low-voltage direct current bus, which is to convert 220V alternating current into low-voltage direct current by an AC/DC circuit to be used as the power supply of the low-voltage direct current bus, and the power supply is redistributed into direct current power supply required by LED lamps through DC/DC conversion, wherein each LED lamp is provided with a DC/DC conversion and a driving circuit. The power supply mode has the problems of complex circuit, low reliability, low power factor, high transmission loss and low system efficiency, and increases the consumption of copper materials of the transmission line to reduce the transmission loss.
The other is to use 220V alternating current as alternating current bus power supply, and the redistribution type step-down rectification supplies power to each LED lamp, and each LED lamp is provided with a power frequency step-down transformer, a rectifier, a DC/DC converter and a driving circuit. Although the transmission line voltage drop is small, the transmission line voltage drop device is provided with a power frequency step-down transformer, an AC/DC, a DC/DC conversion circuit and a driving circuit. The problems of the power supply mode mainly include three: firstly, because the power of a single LED lamp is small, and a perfect power factor correction circuit is not provided, the input power supply harmonic wave is large, and serious pollution is caused to a power grid, secondly, each LED lamp is provided with a power frequency step-down transformer, an AC/DC (alternating current)/DC (direct current)/DC conversion circuit and a driving circuit, the circuit is complex, the system efficiency is low, the reliability is poor, and thirdly, the power frequency step-down transformer is large in size and heavy.
Disclosure of Invention
The invention aims to solve the technical problem of providing a centralized and distributed LED integrated power supply system aiming at the defects of the prior art.
The technical scheme for solving the technical problems is as follows: the utility model provides a centralized distributed LED synthesizes electrical power generating system, includes centralized main power supply and a plurality of distributed extension power supply, centralized main power supply includes filter circuit, active power factor correction PFC circuit, high frequency inverter circuit, auxiliary power supply and main control circuit, filter circuit is connected with the commercial power, filter circuit, active power factor correction PFC circuit, high frequency inverter circuit are electric connection in order, active power factor correction PFC circuit still with auxiliary power supply electricity is connected, auxiliary power supply with main control circuit electricity is connected, main control circuit with high frequency inverter circuit electricity is connected, high frequency inverter circuit respectively with a plurality of extension power supply electricity is connected, extension power supply and LED lamps and lanterns one-to-one electricity are connected.
The beneficial effects of the invention are as follows: according to the centralized and distributed LED integrated power supply system, the centralized main power supply converts commercial power into high-frequency and high-voltage alternating current, so that the problems of low power factor of an LED driving circuit, large size, low efficiency and large noise of a traditional alternating current transformer are solved, and the sectional area of a high-power supply bus can be reduced by adopting high-frequency and high-voltage power supply, so that the wiring cost is reduced; in addition, the centralized main power supply adopts a current interleaving critical mode, so that the efficiency of the active PFC circuit can be improved, the noise of the active PFC circuit can be reduced, and the circuit works in a weak inductive state, so that the pollution of the LED lighting circuit to a power grid can be reduced, the service life of the power supply can be prolonged, and the reliability of the power supply can be improved.
Based on the technical scheme, the invention can also be improved as follows:
further: the active Power Factor Correction (PFC) circuit comprises a main branch and at least one auxiliary branch;
the main branch comprises a rectifier bridge B, a capacitor C1, an inductor L1, a main controller U1, a MOS tube M1, a diode D1, a capacitor Cx, a synchronous current sampling circuit for detecting the current of the inductor L1 and a voltage sampling circuit for detecting the output voltage, wherein two input ends of the rectifier bridge B are respectively and correspondingly and electrically connected with two output ends of the filter circuit, the negative electrode output end of the rectifier bridge B is grounded, the positive electrode output end is grounded through the capacitor C1, the positive electrode output end is also electrically connected with the drain electrode of the MOS tube M1 through the inductor L1, the source electrode of the MOS tube M1 is grounded, the grid electrode of the MOS tube M1 is electrically connected with one output end of the main controller U1, two input ends of the main controller U1 are respectively and electrically connected with the output end of the synchronous current sampling circuit and the output end of the voltage sampling circuit, the drain electrode of the MOS tube M1 is also electrically connected with the positive electrode of the diode D1, the negative electrode of the diode D1 is grounded through the capacitor C1, and the negative electrode of the MOS tube D1 is connected with the high-frequency output end of the inverter circuit as the high-frequency input end;
the secondary branch comprises a capacitor C2, an inductor L2, a secondary controller U2, a MOS tube M2 and a diode D2, wherein the positive output end of the rectifier bridge B is grounded through the capacitor C2, the positive output end is also electrically connected with the drain electrode of the MOS tube M2 through the inductor L2, the source electrode of the MOS tube M2 is grounded, the grid electrode of the MOS tube M2 is electrically connected with one output end of the secondary controller U2, one input end of the secondary controller U2 is electrically connected with the other output end of the main controller U1, the drain electrode of the MOS tube M2 is electrically connected with the positive electrode of the diode D2, and the negative electrode of the diode D2 is electrically connected with the negative electrode of the diode D1.
The beneficial effects of the above-mentioned further scheme are: the rectifier bridge B in the active power factor correction PFC circuit can rectify filtered commercial power, and adopts a current critical mode multipath master-slave staggered parallel circuit topology, so that current peaks can be reduced, switching loss of MOS (metal oxide semiconductor) tubes is reduced, EM I noise is reduced, heating values of power devices and PCB (printed circuit board) on-board inductors are reduced, system efficiency and reliability are improved, and meanwhile, the power factor of the whole power supply is improved.
Further: the number of the slave branches is a plurality, the master branch is connected with the plurality of the slave branches in parallel, and the slave controllers U2 of the plurality of the slave branches are sequentially cascaded.
The beneficial effects of the above-mentioned further scheme are: the secondary branch connected with the main branch in parallel is expanded, so that different input current, power device capacity and total power requirements of a power supply can be met, and the universality of the whole power supply is enhanced.
Further: the synchronous current sampling circuit is a winding wound on the inductor L1, one end of the winding is electrically connected with one input end of the main controller, and the other end of the winding is grounded.
The beneficial effects of the above-mentioned further scheme are: the current on the inductor L1 can be accurately and synchronously sensed through the winding on the inductor L1, and the formed induction current is output to the main controller U1, so that the main controller U1 can synchronously detect the current of the main branch, and the voltage collected by the voltage sampling circuit is combined to control the on-off of the MOS tube.
Further: the auxiliary power supply comprises a DC-DC conversion circuit, wherein the input end of the DC-DC conversion circuit is electrically connected with the positive electrode output end of the rectifier bridge B, and the output end of the DC-DC conversion circuit is electrically connected with the master controller, the slave controller and the master control circuit respectively.
The beneficial effects of the above-mentioned further scheme are: through the DC-DC conversion circuit, the voltage output by the rectifier bridge B can be subjected to buck conversion, direct-current voltages of 5V and 15V are respectively output, and power supplies are provided for the master controller U1, the slave controller U2 and the master control circuit.
Further: the high-frequency inverter circuit comprises a capacitor C3, a capacitor C4, a capacitor C5, an inductor L3, a MOS tube Q1, a MOS tube Q2, a driving circuit, an input sampling circuit and an output sampling circuit, wherein the capacitor C3 is electrically connected between the output end of the active power factor correction PFC circuit and the ground, the output end of the active power factor correction PFC circuit is electrically connected with the drain electrode of the MOS tube Q1, the source electrode of the MOS tube Q1 is electrically connected with the drain electrode of the MOS tube Q2, the source electrode of the MOS tube Q2 is electrically connected with the input end of the input sampling circuit, the output end of the input sampling circuit is electrically connected with one input end of the main control circuit, the ground of the input sampling circuit is grounded, the output end of the main control circuit is electrically connected with the input end of the driving circuit, the output end of the driving circuit is respectively connected with the grid electrode of the MOS tube Q1 and the grid electrode of the MOS tube Q2, the inductor C4, the inductor L3 and the capacitor C5 are also sequentially connected between the drain electrode of the source electrode of the MOS tube Q2, and the input end of the capacitor C3 are respectively connected with the input end of the capacitor C3 in series as power supply; the source electrode of the MOS tube Q2 is also electrically connected with the input end of the output sampling circuit, the output end of the output sampling circuit is electrically connected with the other input end of the main control circuit, and the grounding of the output sampling circuit is grounded.
The beneficial effects of the above-mentioned further scheme are: the high-frequency inverter circuit can convert direct current into alternating current, and can detect output current, voltage and load conditions, and the MCU processor can adjust output frequency and other parameters at any time according to collected parameters so as to automatically adapt to load changes
Further: the distributed extension power supply is a constant voltage drive extension power supply circuit or a constant current drive extension power supply circuit.
Further: the constant voltage drive extension power supply circuit comprises a transformer T1, a diode D3, a diode D4, a capacitor C6, an inductor L4 and a capacitor C7, wherein the input end of a primary coil of the transformer T1 is electrically connected with the output end of the high-frequency inverter circuit, one end of a secondary coil of the transformer T1 is electrically connected with the positive electrode of the diode D3, the negative electrode of the diode D3 is electrically connected with the negative electrode of the diode D4, the positive electrode of the diode D4 is electrically connected with the other end of the secondary coil of the transformer T1, the capacitor C6 is connected in series between the negative electrode of the diode D3 and a middle tap of the secondary coil of the transformer T1, the inductor L4 is connected with the capacitor C6 in parallel after being connected in series, and the common end of the inductor L4 and the capacitor C7 is used as the output end to be electrically connected with the corresponding LED lamp.
The beneficial effects of the above-mentioned further scheme are: the constant voltage driving extension power supply circuit can be used for reducing, rectifying and filtering the high-frequency and high-voltage alternating current output by the high-frequency inverter circuit and outputting constant direct voltage, so that the LED lamp is driven to be lighted, and the circuit is simple in structure, high in efficiency, high in reliability, long in service life and free of maintenance.
Further: the constant current driving extension power supply circuit comprises a transformer T2, a diode D5, a diode D6, a capacitor C8, a resistor R1, a diode D7, an inductor L5, a capacitor C9 and a constant current driving chip I C1, wherein the input end of a primary coil of the transformer T2 is electrically connected with the output end of the high-frequency inverter circuit, one end of a secondary coil of the transformer T2 is electrically connected with the positive electrode of the diode D5, the negative electrode of the diode D5 is electrically connected with the negative electrode of the diode D6, the positive electrode of the diode D6 is electrically connected with the other end of the secondary coil of the transformer T1, the capacitor C8 is connected in series between the negative electrode of the diode D5 and a middle tap of the secondary coil of the transformer T2, the middle tap of the transformer T2 is electrically connected with the grounding end of the constant current driving chip I C, the negative electrode of the diode D5 is electrically connected with the voltage input end of the constant current driving chip I C, the voltage input end of the constant current driving chip I C is electrically connected with the voltage input end of the constant current driving chip 571, the drain end of the capacitor C3 is connected with the drain end of the constant current driving chip and the drain end of the capacitor C3 in series between the drain end of the constant current driving chip and the drain end of the capacitor C1, and the drain end of the capacitor C3 is connected in series with the drain end of the capacitor C3, and the drain end of the constant current driving chip is connected with the drain end of the capacitor C3.
The beneficial effects of the above-mentioned further scheme are: the constant current driving extension power supply circuit can be used for reducing voltage, rectifying and filtering the high-frequency and high-voltage alternating current output by the high-frequency inverter circuit and outputting constant direct current, so that the LED lamp is driven to be lighted, and the circuit is simple in structure, high in efficiency, high in reliability, long in service life and free of maintenance.
Further: the distributed extension power supply is arranged in the corresponding LED lamp and is integrally arranged with the corresponding LED lamp.
The beneficial effects of the above-mentioned further scheme are: through arranging the distributed extension power supply in the corresponding LED lamp and integrally arranging the distributed extension power supply, the space occupied by the distributed extension power supply can be effectively saved, the cost is reduced, and the large-scale production and the application are facilitated.
Drawings
FIG. 1 is a schematic diagram of a centralized and distributed LED integrated power system of the present invention;
fig. 2 is a schematic diagram of an active PFC circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a high-frequency inverter circuit according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a power circuit of a constant voltage driving extension set according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a power circuit of a constant current driving extension set according to an embodiment of the present invention.
In the drawings, the list of components represented by the various numbers is as follows:
1. the LED lamp comprises a centralized main power supply, a distributed extension power supply, a filtering circuit, an active Power Factor Correction (PFC) circuit, a high-frequency inverter circuit, an auxiliary power supply, a main control circuit, a LED lamp and a power supply.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
As shown in fig. 1, a centralized and distributed LED integrated power supply system comprises a centralized main power supply 1 and a plurality of distributed sub-power supplies 2, wherein the centralized main power supply 1 comprises a filter circuit 3, an active power factor correction PFC circuit 4, a high-frequency inverter circuit 5, an auxiliary power supply 6 and a main control circuit 7 which are electrically connected in sequence, the filter circuit 3 is electrically connected with a mains supply, the filter circuit 3, the active power factor correction PFC circuit 4 and the high-frequency inverter circuit 5 are electrically connected in sequence, the active power factor correction PFC circuit 4 is also electrically connected with the auxiliary power supply 6, the auxiliary power supply 6 is electrically connected with the main control circuit 7, the main control circuit 7 is electrically connected with the high-frequency inverter circuit 5, the high-frequency inverter circuit 5 is respectively electrically connected with the sub-power supplies 2, and the sub-power supplies 2 are electrically connected with LED lamps 8 in one-to-one correspondence.
According to the centralized and distributed LED integrated power supply system, the centralized main power supply converts commercial power into high-frequency and high-voltage alternating current, so that the problems of low power factor of an LED driving circuit, large size, low efficiency and large noise of a traditional alternating current transformer are solved, and the sectional area of a high-power supply bus can be reduced by adopting high-frequency and high-voltage power supply, so that the wiring cost is reduced; in addition, the centralized main power supply adopts a current interleaving critical mode, so that the efficiency of the active PFC circuit can be improved, the noise of the active PFC circuit can be reduced, and the circuit works in a weak inductive state, so that the pollution of the LED lighting circuit to a power grid can be reduced, the service life of the power supply can be prolonged, and the reliability of the power supply can be improved.
In the embodiment provided by the invention, the filter circuit 3 adopts a finished high-power EM I power filter, which is beneficial to reducing the system cost, ensuring the consistency of parameters and having strong anti-interference capability.
As shown in fig. 2, in the embodiment provided by the present invention, the active PFC circuit 4 includes a main branch and at least one sub-branch;
the main branch comprises a rectifier bridge B, a capacitor C1, an inductor L1, a main controller U1, a MOS tube M1, a diode D1, a capacitor Cx, a synchronous current sampling circuit for detecting the current of the inductor L1 and a voltage sampling circuit for detecting the output voltage, wherein two input ends of the rectifier bridge B are respectively and correspondingly and electrically connected with two output ends of the filter circuit 3, the negative electrode output end of the rectifier bridge B is grounded, the positive electrode output end is grounded through the capacitor C1, the positive electrode output end is also electrically connected with the drain electrode of the MOS tube M1 through the inductor L1, the source electrode of the MOS tube M1 is grounded, the grid electrode of the MOS tube M1 is electrically connected with one output end of the main controller U1, two input ends of the main controller U1 are respectively and electrically connected with the output end of the synchronous current sampling circuit and the output end of the voltage sampling circuit, the drain electrode of the MOS tube M1 is also electrically connected with the positive electrode of the diode D1, the negative electrode of the diode D1 is grounded through the capacitor C1, and the negative electrode of the MOS tube D1 is connected with the high-frequency output end of the inverter circuit 5;
the secondary branch comprises a capacitor C2, an inductor L2, a secondary controller U2, a MOS tube M2 and a diode D2, wherein the positive output end of the rectifier bridge B is grounded through the capacitor C2, the positive output end is also electrically connected with the drain electrode of the MOS tube M2 through the inductor L2, the source electrode of the MOS tube M2 is grounded, the grid electrode of the MOS tube M2 is electrically connected with one output end of the secondary controller U2, one input end of the secondary controller U2 is electrically connected with the other output end of the main controller U1, the drain electrode of the MOS tube M2 is electrically connected with the positive electrode of the diode D2, and the negative electrode of the diode D2 is electrically connected with the negative electrode of the diode D1.
The filtered commercial power can be rectified through the rectifier bridge B in the active power factor correction PFC circuit 4, a current critical mode multipath master-slave staggered parallel circuit topology is adopted, current peaks can be reduced, switching loss of MOS tubes is reduced, EM I noise is reduced, heating values of power devices and PCB on-board inductors are reduced, system efficiency and reliability are improved, and meanwhile, the power factor of the whole power supply is improved.
Preferably, in the embodiment provided by the invention, the number of the slave branches is a plurality, the master branch is connected with the plurality of the slave branches in parallel, and the plurality of slave controllers U2 of the slave branches are sequentially cascaded. Only two secondary branches are shown in fig. 2, and by expanding the secondary branches connected with the main branch in parallel, different input currents, power device capacities and total power supply power requirements can be met, so that the universality of the whole power supply is enhanced.
In the embodiment provided by the invention, the synchronous current sampling circuit is a winding wound on the inductor L1, one end of the winding is electrically connected with one input end of the main controller, and the other end of the winding is grounded. The current on the inductor L1 can be accurately and synchronously sensed through the winding on the inductor L1, and the formed induction current is output to the main controller U1, so that the main controller U1 can synchronously detect the current of the main branch, and the voltage collected by the voltage sampling circuit is combined to control the on-off of the MOS tube.
In the embodiment provided by the invention, the voltage sampling circuit adopts the voltage division circuit formed by connecting a plurality of resistors in series, and the divided voltage of part of the resistors is taken out and output to the main controller U1, so that the main controller U1 can calculate the output voltage of the active power factor correction PFC circuit according to the divided voltage.
In the invention, the master controller U1 adopts a MH2501 SC chip, the slave controller U2 adopts a MH2511 SC chip, and the energy storage inductor L1 of the main branch is wound with an additional winding to detect the triggering of the zero crossing point of the current of the inductor L1 to generate a control signal, so as to drive the power MOS tube M1 to be conducted. Meanwhile, the output voltage of the active power factor correction PFC circuit 4 is detected, waveform is tidied up and fed back to the main controller U1, the control signal is turned off, and the power MOS tube M1 is driven to be turned off. The power MOS tube M1 realizes zero-current turn-on, and the pump-up diode D1 realizes zero-current turn-off. The master controller U1 of the first path delays and then sends a control signal to the slave controller U2 of the second path to control the on and off of the power MOS tube M2 of the second path, the slave controller U2 of the second path delays and then sends a control signal to the slave controller U2 of the third path to control the on and off of the power MOS tube M2 of the third path, and so on. The multi-path N+1 can be connected in parallel in a staggered way by adopting a master-slave control mode, the proper number of parallel branches can be selected according to the total power of the power supply, and the total current is uniformly distributed by all parallel branches. And other control modes can only realize the staggered parallel connection of two paths at most.
The filtered commercial power is rectified by the rectifier bridge B to obtain 200V direct current voltage, the 200V direct current voltage is processed by the active power factor correction PFC circuit 4 to obtain stable 400V direct current voltage with smaller ripple waves, and the 400V direct current voltage is transmitted to the high-frequency inverter circuit 5, and meanwhile, the power factor of the whole main power supply can be adjusted to be more than 0.99.
In the embodiment provided by the invention, the auxiliary power supply comprises a DC-DC conversion circuit, wherein the input end of the DC-DC conversion circuit is electrically connected with the positive output end of the rectifier bridge B, and the output end of the DC-DC conversion circuit is electrically connected with the master controller, the slave controller and the master control circuit 7 respectively. Through the DC-DC conversion circuit, the voltage output by the rectifier bridge B can be subjected to buck conversion, direct-current voltages of 5V and 15V are respectively output, and power supplies are provided for the master controller U1, the slave controller U2 and the master control circuit.
As shown in fig. 3, in the embodiment provided by the present invention, the high-frequency inverter circuit includes a capacitor C3, a capacitor C4, a capacitor C5, an inductor L3, a MOS transistor Q1, a MOS transistor Q2, a driving circuit, an input sampling circuit, and an output sampling circuit, where the capacitor C3 is electrically connected between an output end of the active PFC circuit and ground, the output end of the active PFC circuit is electrically connected to a drain electrode of the MOS transistor Q1, a source electrode of the MOS transistor Q1 is electrically connected to a drain electrode of the MOS transistor Q2, a source electrode of the MOS transistor Q2 is electrically connected to an input end of the input sampling circuit, an output end of the input sampling circuit is electrically connected to an input end of the main control circuit 7, an output end of the main control circuit 7 is electrically connected to an input end of the driving circuit, output ends of the driving circuit are respectively electrically connected to a gate electrode of the MOS transistor Q1 and a gate electrode of the MOS transistor Q2, a drain electrode of the MOS transistor Q2 is also electrically connected to the inductor L3 and the capacitor L5, and the capacitor L3 are respectively connected in series with the input ends of the capacitor L2 and the capacitor L2; the source electrode of the MOS tube Q2 is also electrically connected with the input end of the output sampling circuit, the output end of the output sampling circuit is electrically connected with the other input end of the main control circuit 7, and the grounding end of the output sampling circuit is grounded. The high-frequency inverter circuit can convert direct current into alternating current, and can detect output current, voltage and load conditions, and the MCU processor can adjust parameters such as output frequency at any time according to collected parameters and automatically adapt to load changes.
It should be noted that, in the present invention, the input sampling circuit adopts a voltage dividing circuit formed by connecting a plurality of resistors in series, and the divided voltage of a part of the resistors is taken out and output to the main control circuit 7, so that the main control circuit 7 can calculate the input voltage of the high-frequency inverter circuit 5 according to the divided voltage; the output sampling circuit includes a voltage dividing circuit and an inductor formed by connecting a plurality of resistors in series, the principle of detecting the output voltage is the same as that of detecting the input voltage, and is not repeated here, the output current is detected by winding a winding on the output inductor, one end of the winding is grounded, the other end of the winding is electrically connected with the input end of the main control circuit 7, the detected induced current is output to the main control circuit 7, and the main control circuit 7 calculates the output current of the high-frequency inverter circuit 5 according to the detected induced current. The driving circuit can adopt the existing MOS tube driving chip, such as SI8235 and the like.
In the invention, the high-frequency inverter circuit 5 adopts a circuit structure form of half-bridge plus LCC, and two high-voltage high-current MOS tubes Q1 and Q2 form a bridge arm. During normal operation, the working states of the MOS transistors Q1 and Q2 are complementary, that is, when the MOS transistor Q1 is in an on/off state, the MOS transistor Q2 is in an off/on state, and dead time is set for driving signals of the MOS transistors Q1 and Q2 to prevent bridge arm through, and the parameter is determined by the main control circuit 7. The capacitor C3 is equivalent to a direct current voltage, the voltage value of the capacitor is about half of the output direct current voltage, the series inductor L3 enables the half-bridge output to be weak in inductance, the capacitor C3 and the output capacitor C5 form a high-frequency filter together, and the whole centralized power supply output is made to be quasi-sine wave, so that the interference of an EMI power supply filter is reduced.
When the high-frequency inverter circuit works normally, after being electrified, the main control circuit 7 is initialized, the main control circuit 7 starts to detect a load, and the load is detected to be in a normal working state only when no short circuit exists normally, so that the high-frequency inverter circuit 5 is controlled to enter a frequency conversion voltage regulation working mode; the output voltage and current are respectively processed by the output sampling circuit and then are sent to the main control circuit 7 for sampling, the main control circuit 7 judges the condition of the output connected load and then generates a control signal which is sent to the driving circuit to respectively drive the MOS transistors Q1 and Q2 to be turned off and turned on timely, so that the output of the main power supply is ensured to be constant voltage alternating current which is variable in frequency along with the load, the lower the load is, the lower the output frequency is, and otherwise, the higher the output frequency is.
During the whole normal working period, the main control circuit 7 monitors the input and output voltage and current parameters in real time, and once abnormality occurs, the output voltage of the whole main power supply is immediately cut off, so that the high reliability of the whole system is ensured. The centralized main power supply outputs alternating current with variable frequency and high voltage and constant voltage, so that the section of a lead can be reduced compared with a traditional power supply mode for a main power supply bus of the whole LED power supply system, the unit power cost of the system is reduced, the power supply bus adopts a twisted pair mode, the interference of an EM I power supply filter for high frequency voltage output can be reduced, the influence of fluctuation of power grid voltage on a distributed extension power supply 2 behind the main power supply can be effectively avoided by constant voltage output, the power factor and the power supply efficiency of the LED power supply are improved, and the service life of LED lamp beads is prolonged.
In the present invention, the main control circuit 7 may use a microprocessor such as a conventional single-chip microcomputer.
Preferably, in the embodiment provided by the present invention, the slave power supply 2 is a constant voltage drive slave power supply circuit or a constant current drive slave power supply circuit.
As shown in fig. 4, in a further preferred embodiment of the present invention, the constant voltage driving extension power supply circuit includes a transformer T1, a diode D3, a diode D4, a capacitor C6, an inductor L4, and a capacitor C7, where an input end of a primary coil of the transformer T1 is electrically connected to an output end of the high frequency inverter circuit 5, one end of a secondary coil of the transformer T1 is electrically connected to an anode of the diode D3, a cathode of the diode D3 is electrically connected to a cathode of the diode D4, an anode of the diode D4 is electrically connected to another end of the secondary coil of the transformer T1, the capacitor C6 is connected in series between the cathode of the diode D3 and a center tap of the secondary coil of the transformer T1, the inductor L4 is connected in parallel with the capacitor C6 after being connected in series with the capacitor C7, and a common end of the inductor L4 and the capacitor C7 is electrically connected to the corresponding LED lamp 8 as an output end.
The high-frequency alternating voltage sent from the centralized main power supply is sent to the primary coil of the isolation transformer T1, is reduced by the isolation transformer, is full-wave rectified by the diodes D3 and D4, and is filtered by the pi-type filter circuit formed by C6, L4 and C7 to obtain stable direct voltage.
The constant voltage driving extension power supply circuit can be used for reducing, rectifying and filtering the high-frequency and high-voltage alternating current output by the high-frequency inverter circuit 5 and outputting constant direct voltage, so that the LED lamp 8 is driven to be lightened, and the circuit is simple in structure, high in efficiency, high in reliability, long in service life and free of maintenance.
As shown in fig. 5, in a further preferred embodiment of the present invention, the constant current driving sub power supply circuit includes a transformer T2, a diode D5, a diode D6, a capacitor C8, a resistor R1, a diode D7, an inductor L5, a capacitor C9, and a constant current driving chip I C1, where an input end of a primary coil of the transformer T2 is electrically connected to an output end of the high frequency inverter circuit 5, one end of a secondary coil of the transformer T2 is electrically connected to an anode of the diode D5, a cathode of the diode D5 is electrically connected to a cathode of the diode D6, an anode of the diode D6 is electrically connected to the other end of a secondary coil of the transformer T1, the capacitor C8 is connected in series between the cathode of the diode D5 and an intermediate tap of the secondary coil of the transformer T2, the intermediate tap of the transformer T2 is electrically connected to a ground end of the constant current driving chip I C, an anode of the diode D5 is electrically connected to an anode of the constant current driving chip 571, a drain end of the constant current driving chip is connected to a drain end of the constant current driving chip 3723, and a drain end of the constant current driving chip is connected in series between the drain end of the constant current driving chip and the constant current driving chip 371, and the drain end of the constant current driving chip is connected to the drain end of the constant current driving chip.
The high-frequency alternating voltage sent from the centralized main power supply is sent to the primary coil of the isolation transformer T2, is reduced by the isolation transformer T2, is full-wave rectified by the diodes D5 and D6, and is filtered by the capacitor C8 to obtain direct-current voltage, the resistor R1 is connected in series with the power supply loop of the LED to be used as the LED driving current for sampling, and the sampled voltage is sent to the LED special constant-current driving chip I C1, so that the driving current can be ensured to be kept at a required constant value even if the external input voltage or the load LED changes within a certain range. Different driving currents can be obtained by changing the value of the sampling resistor R, and the LED lamp bead is suitable for LED lamp beads with different specifications.
The constant current driving extension power supply circuit can be used for reducing voltage, rectifying and filtering the high-frequency and high-voltage alternating current output by the high-frequency inverter circuit 5 and outputting constant direct current, so that the LED lamp 8 is driven to be lightened, and the circuit is simple in structure, high in efficiency, high in reliability, long in service life and free of maintenance. Here, the constant current driving chip I C1 may perform targeted matching selection according to the power of the load LED lamp 8, and the conventional constant current driving chip may be adopted, which is not limited in any way.
Preferably, in the embodiment provided by the present invention, the distributed sub-power supply 2 is disposed in the corresponding LED lamp 8, and is integrally disposed with the corresponding LED lamp 8. Through arranging the extension power supply 2 in the corresponding LED lamp 8 and integrally arranging, the space occupied by the distributed extension power supply 2 can be effectively saved, the cost is reduced, and the large-scale production and the application are facilitated.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (8)
1. The centralized and distributed LED integrated power supply system is characterized by comprising a centralized main power supply (1) and a plurality of distributed sub-power supplies (2), wherein the centralized main power supply (1) comprises a filter circuit (3), an active power factor correction PFC circuit (4), a high-frequency inverter circuit (5), an auxiliary power supply (6) and a main control circuit (7), the filter circuit (3) is electrically connected with mains supply, the filter circuit (3), the active power factor correction PFC circuit (4) and the high-frequency inverter circuit (5) are electrically connected in sequence, the active power factor correction PFC circuit (4) is also electrically connected with the auxiliary power supply (6), the auxiliary power supply (6) is electrically connected with the main control circuit (7), the main control circuit (7) is electrically connected with the high-frequency inverter circuit (5), the high-frequency inverter circuit (5) is respectively electrically connected with the sub-power supplies (2), and the power supplies (2) are electrically connected with LED lamps (8) in a one-to-one correspondence manner;
the active Power Factor Correction (PFC) circuit (4) comprises a main branch and at least one auxiliary branch;
the main branch comprises a rectifier bridge B, a capacitor C1, an inductor L1, a main controller U1, a MOS tube M1, a diode D1, a capacitor Cx, a synchronous current sampling circuit for detecting the current of the inductor L1 and a voltage sampling circuit for detecting the output voltage, wherein two input ends of the rectifier bridge B are respectively and correspondingly and electrically connected with two output ends of a filter circuit (3), the negative electrode output end of the rectifier bridge B is grounded, the positive electrode output end is grounded through the capacitor C1, the positive electrode output end is also electrically connected with the drain electrode of the MOS tube M1 through the inductor L1, the source electrode of the MOS tube M1 is grounded, the grid electrode of the MOS tube M1 is electrically connected with one output end of the main controller U1, two input ends of the main controller U1 are respectively and electrically connected with the output end of the synchronous current sampling circuit and the output end of the voltage sampling circuit, the drain electrode of the MOS tube M1 is also electrically connected with the positive electrode of the diode D1, the negative electrode of the diode D1 is grounded through the capacitor C1, and the negative electrode of the MOS tube D1 is connected with the high-frequency output end of the inverter circuit (D5);
the secondary branch comprises a capacitor C2, an inductor L2, a secondary controller U2, a MOS tube M2 and a diode D2, wherein the positive output end of the rectifier bridge B is grounded through the capacitor C2, the positive output end is also electrically connected with the drain electrode of the MOS tube M2 through the inductor L2, the source electrode of the MOS tube M2 is grounded, the grid electrode of the MOS tube M2 is electrically connected with one output end of the secondary controller U2, one input end of the secondary controller U2 is electrically connected with the other output end of the main controller U1, the drain electrode of the MOS tube M2 is also electrically connected with the positive electrode of the diode D2, and the negative electrode of the diode D2 is electrically connected with the negative electrode of the diode D1;
the slave power supply (2) is a constant voltage drive slave power supply circuit or a constant current drive slave power supply circuit.
2. The integrated power supply system according to claim 1, wherein the number of the secondary branches is plural, the primary branch is connected in parallel with the plural secondary branches, and the plural secondary controllers U2 of the secondary branches are serially cascaded.
3. The integrated power supply system for the centralized and distributed LED as set forth in claim 1, wherein the synchronous current sampling circuit is a winding wound on the inductor L1, and one end of the winding is electrically connected with one input end of the main controller, and the other end is grounded.
4. The centralized and distributed LED integrated power system as claimed in claim 1, wherein the auxiliary power supply comprises a DC-DC conversion circuit, an input end of the DC-DC conversion circuit is electrically connected with an output end of the positive electrode of the rectifier bridge B, and the output ends of the DC-DC conversion circuit are electrically connected with the master controller, the slave controller and the master control circuit (7) respectively.
5. The centralized and distributed LED integrated power system as set forth in claim 1, wherein the high-frequency inverter circuit comprises a capacitor C3, a capacitor C4, a capacitor C5, an inductor L3, a MOS transistor Q1, a MOS transistor Q2, a driving circuit, an input sampling circuit and an output sampling circuit, wherein the capacitor C3 is electrically connected between the output end of the active power factor correction PFC circuit and the ground, the output end of the active power factor correction PFC circuit is electrically connected with the drain electrode of the MOS transistor Q1, the source electrode of the MOS transistor Q1 is electrically connected with the drain electrode of the MOS transistor Q2, the source electrode of the MOS transistor Q2 is electrically connected with the input end of the input sampling circuit, the output end of the input sampling circuit is electrically connected with one input end of the main control circuit (7), the output end of the main control circuit (7) is electrically connected with the input end of the driving circuit, the output end of the driving circuit is respectively connected with the grid electrode of the MOS transistor Q1 and the drain electrode of the MOS transistor Q2, the source electrode of the MOS transistor Q2 is electrically connected with the capacitor C3 and the drain electrode of the main control circuit (7), and the capacitor C3 is also connected in series with the capacitor C4 and the drain electrode of the MOS transistor Q2; the source electrode of the MOS tube Q2 is also electrically connected with the input end of the output sampling circuit, the output end of the output sampling circuit is electrically connected with the other input end of the main control circuit (7), and the grounding end of the output sampling circuit is grounded.
6. The centralized and distributed LED integrated power system as set forth in claim 1, wherein the constant voltage driving extension power circuit comprises a transformer T1, a diode D3, a diode D4, a capacitor C6, an inductor L4 and a capacitor C7, wherein the input end of a primary coil of the transformer T1 is electrically connected with the output end of the high frequency inverter circuit (5), one end of a secondary coil of the transformer T1 is electrically connected with the positive electrode of the diode D3, the negative electrode of the diode D3 is electrically connected with the negative electrode of the diode D4, the positive electrode of the diode D4 is electrically connected with the other end of the secondary coil of the transformer T1, the capacitor C6 is connected in series between the negative electrode of the diode D3 and a center tap of the secondary coil of the transformer T1, the inductor L4 is connected with the capacitor C6 in parallel after being connected in series, and the common end of the inductor L4 and the capacitor C7 is electrically connected with the corresponding LED lamp (8) as the output end.
7. The centralized and distributed LED integrated power system as set forth in claim 1, wherein the constant current driving extension power circuit comprises a transformer T2, a diode D5, a diode D6, a capacitor C8, a resistor R1, a diode D7, an inductor L5, a capacitor C9 and a constant current driving chip IC1, wherein the primary coil input end of the transformer T2 is electrically connected with the output end of the high frequency inverter circuit (5), one end of the secondary coil of the transformer T2 is electrically connected with the positive electrode of the diode D5, the negative electrode of the diode D5 is electrically connected with the negative electrode of the diode D6, the positive electrode of the diode D6 is electrically connected with the other end of the secondary coil of the transformer T1, the capacitor C8 is connected in series between the negative electrode of the diode D5 and the intermediate tap of the secondary coil of the transformer T2, the intermediate tap of the transformer T2 is electrically connected with the ground end of the constant current driving chip IC1, the negative electrode of the diode D5 is electrically connected with the drain end of the constant current driving chip IC1, and the drain end of the constant current driving chip is connected in series between the drain end of the constant current driving chip IC1 and the drain end of the constant current driving chip, and the drain end of the constant current driving chip is connected with the drain end of the constant current driving chip IC 1.
8. The centralized and distributed integrated power supply system for LEDs as claimed in any one of claims 1-7, wherein said extension power supply (2) is disposed in a corresponding LED lamp (8) and integrally disposed with a corresponding LED lamp (8).
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| CN114744867A (en) * | 2022-06-09 | 2022-07-12 | 深圳市高斯宝电气技术有限公司 | PFC boost circuit with parallel-connection interleaved CRM modes |
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