CN113163549A - LED driving power supply starting method and circuit thereof - Google Patents
LED driving power supply starting method and circuit thereof Download PDFInfo
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- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- H—ELECTRICITY
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- H05B45/30—Driver circuits
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Abstract
The application relates to the field of driving power supplies, in particular to a method and a circuit for starting an LED driving power supply, wherein the method comprises the steps of rectifying input alternating-current voltage to obtain rectified voltage; synchronously tracking the alternating current waveform of the constant current voltage so as to synchronize the alternating current waveform with the rectified voltage waveform to obtain synchronous current; performing full-wave rectification on the synchronous current, and outputting direct current, wherein the direct current is used for supplying power to an LED load; electrolytic-capacitor-free filtering is performed across the LED load. The traditional LED driver output circuit needs electrolytic capacitor filtering, so that the effects of smoothing output current and reducing LED stroboscopic are achieved. The primary side of the power supply adopts a half-bridge type switching power supply, the secondary side adopts an LC filtering mode, high-frequency ripple components can be filtered, low ripple current output can be realized, and the effect of ultra-long service life is achieved.
Description
Technical Field
The application relates to the field of driving power supplies, in particular to a starting method and a circuit of an LED driving power supply.
Background
The LED lamp has the advantages of environmental friendliness, long service life, high luminous efficiency, high response speed and the like, at present, the LED illumination is applied to the fields of urban landscape illumination, liquid crystal display backlight sources, street lamp illumination, common illumination, medical treatment, traffic and the like, the LED lamp needs to work in a low-voltage and high-current environment and cannot be directly powered by mains supply to emit light like an incandescent lamp, so an LED driving power supply is required for the LED illumination, and therefore, the LED driving power supply with high development efficiency, small size, long service life and high reliability is a key for ensuring the luminous quality and the integral illumination performance of the LED lamp.
An LED driving power supply is a voltage converter that converts a power supply into a specific voltage and current to drive an LED to emit light. Typically, the input of the LED driving power source includes high-voltage high-frequency alternating current (i.e. commercial power), low-voltage direct current, high-voltage direct current, low-voltage high-frequency alternating current (e.g. output of an electronic transformer), and the like. The output of the LED driving power supply is mostly a constant current source that can change voltage with the forward voltage drop value of the LED light source.
The service life of the LED light source is 5-10 ten thousand hours. Converted into a lifetime of 6 to 12 years for continuous lighting. The service life of the LED driving power supply is hard to reach 6 years, the quality guarantee period of the LED driving power supply sold on the market is usually 2-3 years, the quality guarantee period of the LED driving power supply reaching 6 years is military grade, the price is 4-6 times of that of the common LED driving power supply, and the common LED driving power supply is hard to bear in common lamp factories. Therefore, the LED lamp has more faults on the LED driving power supply. Compared with a semiconductor device and a passive element with the service life of 10 ten thousand hours and the semi-permanent service life, the LED driving power supply can only work for about 5 thousand hours generally, and the service life requirement of an LED lamp can not be met.
Disclosure of Invention
In order to prolong the service life of the LED driving power supply, the application provides a starting method of the LED driving power supply and a circuit thereof.
In a first aspect, the present application provides a method for starting an LED driving power supply, which adopts the following technical scheme:
an LED driving power supply starting method comprises the following steps:
rectifying the input alternating voltage to obtain rectified voltage;
synchronously tracking the alternating current waveform of the constant current voltage so as to synchronize the alternating current waveform with the rectified voltage waveform to obtain synchronous current;
performing full-wave rectification on the synchronous current, and outputting direct current, wherein the direct current is used for supplying power to an LED load;
electrolytic-capacitor-free filtering is performed across the LED load.
By adopting the technical scheme, the alternating-current voltage is rectified, so that the voltage meets the requirement of the direct-current voltage of the LED load; the synchronous current is synchronous with the rectified voltage, so that the power loss in a circuit can be reduced, the conversion efficiency of a power supply is improved, and the heat generated by the power supply is reduced, so that the service life of the LED driving power supply is prolonged; full-wave rectification can convert synchronous current into direct current, so that the current can be matched with the constant current requirement of an LED load; electrolytic capacitor-free filtering is carried out at two ends of the LED load, so that the LED load and the LED driving power supply are prevented from surge impact and filtering, and the service life of the LED driving power supply is prolonged. Therefore, the LED driving power supply has the effect of prolonging the service life of the LED driving power supply.
Preferably, after the synchronous current is obtained, the synchronous current is subjected to resonance filtering to reduce the ripple of the direct current.
By adopting the technical scheme, because some high-frequency pulse current still exists in the synchronous current, in order to suppress the high-frequency pulse as much as possible, the direct current component is kept as much as possible, the synchronous current is close to the ideal direct current, the effect of reducing the pulse current can be played through the resonance filtering, and the effect that the output of the synchronous current is smooth is achieved.
Preferably, in the process of obtaining the rectified voltage, the absorption ultrahigh frequency signal processing is performed on the alternating voltage.
By adopting the technical scheme, the ultrahigh frequency signal absorbing processing can inhibit high-frequency noise and spike interference in the rectification process, and the ultrahigh frequency signal absorbing processing device also has the capability of absorbing electrostatic pulses, reduces the load of the LED driving power supply and plays a role in protecting the LED driving power supply.
In a second aspect, the present application provides an LED driving power supply starting circuit, which adopts the following technical solution:
a starting circuit of an LED driving power supply comprises a rectifying circuit;
the PFC circuit comprises a PFC controller, wherein the PFC controller comprises a power supply end VCC, a half-bridge high-end driving end HSGD, a half-bridge high-end ground end HSGND and a half-bridge low-end driving end LSGD;
the half-bridge resonant circuit is used for realizing steady-state operation of voltage and current; the half-bridge resonant circuit comprises a high-side drive MOS tube Q2, a low-side drive MOS tube Q3, a resonant capacitor C19, a resonant inductor L5 and a transformer T1; the transformer T1 is a center tap transformer;
the drain electrode of the high-side driving MOS tube Q2 is connected with the output end of the rectifying circuit, the gate electrode of the high-side driving MOS tube Q2 is connected with the high-side driving end HSGD of the half bridge, and the source electrode of the high-side driving MOS tube Q2 is connected with the high-side ground end HSGND of the half bridge;
the drain of the low-side driving MOS transistor Q3 is connected to a half-bridge high-side ground terminal HSGND, the gate of the low-side driving MOS transistor Q3 is connected to a half-bridge low-side driving terminal LSGD, and the source of the low-side driving MOS transistor Q3 is connected to the ground;
one end of the resonant inductor L5 is connected with a half-bridge high-end ground end HSGND, the other end of the resonant inductor L5 is connected with one pole of a resonant capacitor C19, the other pole of the resonant capacitor C19 is connected with the head end of the primary side of a transformer T1, and the tail end of the primary side of the transformer T1 is grounded;
a full wave rectifier comprising a first rectifying diode D12, a second rectifying diode D13, and an output capacitor C22;
the anode of the first rectifying diode D12 is connected with the head end of the secondary side of the transformer T1, and the anode of the second rectifying diode D13 is connected with the tail end of the secondary side of the transformer T1; the cathode of the first rectifier diode D12 and the cathode of the second rectifier diode D13 are connected to a low-voltage side direct current positive bus, and the secondary side center tap of the transformer T1 is connected to a low-voltage side direct current negative bus;
the low-voltage side direct-current negative bus grounding wire;
the low-voltage side direct-current positive bus and the low-voltage side direct-current negative bus are used for connecting an LED load; the output capacitor C22 is connected between the low-voltage side direct current positive bus and the low-voltage side direct current negative bus;
the output capacitor is a non-electrolytic capacitor.
By adopting the technical scheme, the rectifying circuit can convert power supply into specific voltage and current, for example, commercial power is converted into direct current voltage after passing through the rectifying circuit, and the primary rectifying function is achieved;
the PFC circuit can realize an electrical isolation function, so that the safety of power supply equipment is ensured, and the danger from a high-voltage feeder is avoided; the power factor correction function is provided, and the power factor correction function is used for forcing the line current to follow the line voltage, so that the line current is sinusoidal, the power factor is improved, and the harmonic content is reduced; the inverter circuit realizes an inverter function, namely the frequency and the amplitude of the output voltage or current of the inverter are flexibly changed according to requirements by controlling the working frequency and the output time proportion of the inverter circuit.
The resonant inductor L5 and the resonant capacitor C19 are connected in series to form a half-bridge resonant circuit, so that when the power supply is a direct-current power supply, the current in the circuit changes according to a sine rule. Because the current or the voltage changes according to a sine rule and has a zero crossing point, the high-end driving MOS transistor Q2 and the low-end driving MOS transistor Q3 are switched on or off regularly, so that the loss generated by the high-end driving MOS transistor Q2 and the low-end driving MOS transistor Q3 is zero, and the soft switching function is realized.
The full-wave rectifier can be unidirectionally conducted by the filtered currents alternately output from the head end and the tail end of the secondary side of the transformer T1 by the first rectifying diode D12 and the second rectifying diode D13, and the conducted direct currents are collected in the low-voltage direct-current positive bus, so that the continuous current output can be realized by making full use of the positive and negative periodic currents.
The LED driving power supply has the advantages that no electrolytic capacitor is generated, no electrolyte is generated, the LED driving power supply has almost no inductance, and the loss is not easy to occur at a high temperature generated by the LED driving power supply; the electrolytic capacitor has very high working electric field intensity and small volume, is beneficial to the miniaturization of the whole LED driving power supply, and can reduce the short service life of the LED driving power supply and prolong the service life of the LED driving power supply.
Preferably, a power compensation capacitor C18 is connected in parallel to the head end and the tail end of the primary side of the transformer T1.
By adopting the technical scheme, because the transformer T1 belongs to an inductive load and the power factor is lower, the power factor of the half-bridge resonant circuit can be improved by connecting the power compensation capacitor C18 in parallel on the primary side of the transformer T1.
Preferably, the low-side direct-current positive bus is connected in series with a filter capacitor L6 between the cathode of the first rectifying diode D12 and the output capacitor C22.
By adopting the technical scheme, the filter capacitor L6 can filter the circuit of the full-wave rectifier on one hand, and can form an LC parallel resonance circuit with the winding of the transformer T1 on the other hand, so that the current is increased.
The capacitor without electrolysis is any one of a thin film capacitor, a non-polar capacitor or a CBB capacitor.
By adopting the technical scheme, the electrolytic-free capacitor has the performance of automatically repairing or isolating the defects in the oxide film in the working process, so that the oxide film medium in the electrolytic-free capacitor is reinforced and recovered with the due insulating capability at any time, and continuous accumulative damage is avoided. The unique self-healing performance provides advantages for the overall long service life and reliability of the LED driving power supply.
Preferably, the secondary side of the transformer T1 is connected in parallel with a protective capacitor C20.
By adopting the technical scheme, the power factor on the line is reduced due to the characteristic that the current of the inductive load of the transformer T1 lags behind the voltage, so that the capacity of effectively doing work on the output power is reduced. In order to better utilize the output electric energy, the characteristic that the voltage of the capacitor lags behind the current is utilized, and the compensation capacitor is connected to the output line of the transformer to counteract the phenomenon of power factor reduction caused by the load operation of the inductive transformer T1 and improve the power factor.
Preferably, an open-circuit protector is arranged in the full-wave rectifier, and the open-circuit protector comprises a bidirectional thyristor Q8, an auxiliary capacitor C21, a protection diode D14, a transistor Q9, a fifty-first capacitor R50, a fifty-first resistor R51, a fifty-second resistor R52 and a fifty-third resistor R53;
a first anode of the bidirectional thyristor Q8 is connected with a filter capacitor L6, and a second anode of the bidirectional thyristor Q8 is connected with a low-voltage side direct-current negative bus;
two ends of the auxiliary capacitor C21 are connected between the first anode of the bidirectional thyristor Q8 and the control end;
two ends of the fifty-fifth capacitor R50 are connected between the first anode of the bidirectional thyristor Q8 and the control end;
one end of the fifty-first resistor R51 is connected to the control end of the bidirectional thyristor Q8, the other end of the fifty-first resistor R51 is connected to the negative electrode of the protection diode D14, the positive electrode of the protection diode D14 is connected to the first electrode of the transistor Q9, and the second electrode of the transistor Q9 is connected to the low-voltage side direct-current negative bus;
the fifty-second resistor R52 and the fifty-third resistor R53 are connected in series between the low-voltage-side direct-current positive bus and the low-voltage-side direct-current negative bus, and the third pole of the transistor Q9 is connected to a connection point between the fifty-second resistor R52 and the fifty-third resistor R53.
By adopting the technical scheme, the second electrode of the transistor Q9 drives the transistor Q9 to be conducted when being electrified, so that whether the LED load is in an open-circuit state or not is detected, if the LED load is in the open-circuit state, the control end of the bidirectional thyristor Q8 receives a pulse current under the conduction of the transistor Q9, and the bidirectional thyristor Q8 is conducted in a bidirectional mode; the current of the low-voltage side direct current positive bus is led into a ground wire connected with the low-voltage side direct current negative bus through the bidirectional thyristor Q8, and the full-wave rectification circuit is protected. The auxiliary capacitors C21 and the fifty-fifth capacitor R50 are used for filtering transient signals and unstable voltage and current signals applied between the control end of the triac Q8 and the first anode, and the triac Q8 is prevented from being turned on under external interference.
Preferably, the model of the PFC controller is ICB2FL 03G.
By adopting the technical scheme, the ICB2FL03G has high compatibility, can adapt to the characteristics of various LED loads, and can be suitable for the requirements of dimming ballasts and multi-power ballasts.
In summary, the present application includes at least one of the following beneficial technical effects:
1. according to the starting method of the LED driving power supply, high-frequency ripple components can be filtered, low ripple current output can be achieved, and the effect of long service life of the LED driving power supply is achieved;
2. the LED driving power supply has the advantages that no electrolytic capacitor is generated, no electrolyte is generated, the LED driving power supply has almost no inductance, and the loss is not easy to occur at a high temperature generated by the LED driving power supply;
3. the resonant inductor L5 and the resonant capacitor C19 are connected in series to form a resonant circuit, so that when the power supply is a direct-current power supply, the current in the circuit changes according to a sine rule, and the generation of pulse spikes of the current is reduced.
Drawings
Fig. 1 is a schematic flowchart of a method for starting an LED driving power supply according to an embodiment of the present disclosure.
Fig. 2 is an overall circuit diagram of a starting circuit of an LED driving power supply according to an embodiment of the present application.
Fig. 3 is a circuit diagram of a rectifier circuit according to an embodiment of the present application.
Fig. 4 is a circuit diagram of a filtering unit according to an embodiment of the present application.
Fig. 5 is a circuit diagram of a PFC circuit according to an embodiment of the present application.
Fig. 6 is a circuit diagram of a full wave rectifier according to an embodiment of the present application.
Detailed Description
The present application is described in further detail below with reference to fig. 1-6.
The embodiment of the application provides a method for starting an LED driving power supply.
Referring to fig. 1, a method for starting an LED driving power supply includes rectifying an input ac voltage to obtain a rectified voltage; synchronously tracking the alternating current waveform of the constant current voltage so as to synchronize the alternating current waveform with the rectified voltage waveform to obtain synchronous current; performing full-wave rectification on the synchronous current, and outputting direct current, wherein the direct current is used for supplying power to an LED load; electrolytic-capacitor-free filtering is performed across the LED load. After the synchronous current is obtained, the synchronous current is subjected to resonance filtering so as to reduce the ripple of the direct current. And in the process of obtaining the rectified voltage, the alternating voltage is subjected to absorption ultrahigh frequency signal processing.
The implementation principle of the method for starting the LED driving power supply in the embodiment of the application is as follows: rectifying the alternating voltage to make the voltage meet the requirement of the direct voltage of the LED load; the synchronous current is synchronous with the rectified voltage, so that the power loss in a circuit can be reduced, the conversion efficiency of a power supply is improved, and the heat generated by the power supply is reduced, so that the service life of the LED driving power supply is prolonged; full-wave rectification can convert synchronous current into direct current, so that the current can be matched with the constant current requirement of an LED load; electrolytic capacitor-free filtering is carried out at two ends of the LED load, so that the LED load and the LED driving power supply are prevented from surge impact and filtering, and the service life of the LED driving power supply is prolonged. Therefore, the LED driving power supply has the effect of prolonging the service life of the LED driving power supply.
The embodiment of the application also provides an LED driving power supply starting circuit.
Referring to fig. 2, an LED driving power supply starting circuit includes a rectifying circuit for rectifying an alternating current into a direct current, a PFC circuit for adjusting a voltage frequency and an amplitude, a half-bridge resonant circuit for adjusting a current to be conducted in a positive half cycle, and a full-wave rectifier for smoothly outputting the current in the positive half cycle, an output terminal of the rectifying circuit is connected to an input terminal of the PFC circuit, an output terminal of the PFC circuit is connected to an input terminal of the half-bridge resonant circuit, and an output terminal of the half-bridge resonant circuit is connected to an output terminal of the full-wave rectifier. The current output after passing through the LED driving power supply starting circuit is stable. The LED driving power supply starting circuit is specifically analyzed below.
Referring to fig. 2 and 3, the rectifier circuit includes a rectifier bridge B1, an ac input terminal L and an ac input terminal N, where the ac input terminal L and the ac input terminal N are used for receiving alternating current. The rectifier bridge B1 comprises 4 diodes, wherein the diodes are connected in series two by two to form two branches, the cathode of the previous diode in each branch is connected with the anode of the next diode to form a first input connection point and a second input connection point respectively; the two branches are connected in parallel, suspended cathodes of the diodes in each branch are connected with each other to form an output end of the rectifying circuit, and suspended anodes of the diodes are connected with each other to form a rectifying ground end. The ac input terminal L is connected to the first input connection point, and the ac input terminal N is connected to the second input connection point, so that ac power passing through the rectifier bridge B1 is converted into dc power.
Furthermore, a voltage dependent resistor RV1 is connected between the first input connection point and the second input connection point, and a second capacitor C2 is connected in parallel at two ends of the voltage dependent resistor RV 1. The ac input terminal L and the ac input terminal N are connected to a first transformer L1 between the first capacitor C1 and the second capacitor C2, and further, the first transformer L1 may be a transformer with iron core and two windings, one of the windings of the first transformer L1 is connected in series to the ac input terminal L, and the other winding is connected in series to the ac input terminal N. Since the first transformer L1 has the functions of filtering, oscillating, delaying, notching, etc. in the trimming circuit, the current output after passing through the first transformer L1 is smoother.
Further, a protective tube P1 is connected in series between the ac access end L and the input end of the rectifier bridge. The ac input terminal N is connected to a ground unit between the first transformer L1 and the second input connection point, one end of the ground unit is grounded, and the ground unit is connected in series with a fourth resistor C4, a second inductor L2, and a second resistor R2 in this order.
Referring to fig. 4 and 5, the PFC circuit includes a filtering unit and a PFC controller. The model of the PFC controller may be a controller of S9S08DZ48F2MLF, S9S08AW60MFGE, ICB2FL01G series, ICB2FL02G series, or ICB2FL03G series, and the present embodiment exemplifies a PFC controller of model ICB2FL03G, which includes a loop sub-unit for supplying power to the PFC controller to form a loop, a low-side driving sub-unit and a high-side driving sub-unit for controlling the conduction of the half-bridge resonant circuit, a PFC parameter sub-unit for controlling the operating parameters of the PFC controller, a setting parameter sub-unit for controlling the operating parameters of the LED lamp, and a protection sub-unit for controlling the blocking of the controller in case of abnormality.
The circuit subunit comprises a power supply terminal VCC and a ground terminal GND, the low-side drive subunit comprises a half-bridge low-side drive terminal LSGD and a half-bridge low-side current detection terminal LSCS, the high-side drive subunit comprises a half-bridge high-side ground terminal HSGND, a high-side drive power supply terminal HSVCC and a half-bridge high-side drive terminal HSGD, the PFC parameter subunit comprises a PFC drive terminal PFCGD, a PFC current detection terminal PFCCS, a PFC zero current detection terminal PFCZCD and a PFC voltage detection terminal PFCVS, the parameter setting subunit comprises a working pause rate setting terminal RFRUN, a first parameter setting terminal N1 and a second parameter setting terminal N2, and the protection subunit comprises an overvoltage protection terminal OVP and an over-temperature protection terminal OTP.
Referring to fig. 4, the filtering unit includes a sixteenth diode D16, the sixteenth diode D16 is further connected in parallel with a third inductor L3, and the third inductor L3 is a double-winding transformer. The head end of the primary side of the third inductor L3 is connected to the anode of the sixteenth diode D16, and the tail end of the primary side of the third inductor L3 is connected to the cathode of the sixteenth diode D16; the head end of the secondary side of the third inductor L3 is grounded, the secondary side of the third inductor L3 is connected to the detection terminal ZCD, and the detection terminal ZCD is connected to the PFC zero current detection terminal PFCZCD. Further, a third resistor R3 is connected in series between the secondary side of the third inductor L3 and the detection terminal ZCD.
Referring to fig. 2 and 4, a fourth inductor L4 and a first diode D1 are further connected in series between the end of the primary side of the third inductor L3 and the cathode of the sixteenth diode D16, the anode of the first diode D1 is connected to one end of the fourth inductor, and the cathode of the first diode D1 is connected to the cathode of the sixteenth diode D16; the cathode of the first diode D1 is connected to ground. A twenty-fifth capacitor C25 is also connected in parallel across the first diode D1. In another embodiment, the sixteenth diode D16 may be replaced with a patch magnetic bead.
Referring to fig. 2 and 5, an eighth capacitor C8 is connected between the power supply terminal VCC and the ground terminal GND, and a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, and a nineteenth resistor R19 are connected in series between the negative electrode of the sixteenth diode D16 and the power supply terminal VCC. The ground terminal GND is grounded. A first resistor R1 is connected in series between the power supply terminal VCC and the PFC driving terminal PFCGD.
The PFC driving end PFCGD is connected to a PFC driving MOS Q1, a drain of the PFC driving MOS Q1 is connected between the fourth inductor L4 and the end of the primary side of the third inductor L3, a gate of the PFC driving MOS Q1 is connected to ground, and a source PFC driving end PFCGD of the PFC driving MOS Q1 is connected. Furthermore, a current limiting resistor group is connected in series between the gate of the PFC driving MOS transistor Q1 and the ground, and the current limiting resistor group is formed by connecting a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6 in parallel. Further, a seventh resistor R7 is connected between the source PFC driving end PFCGD of the PFC driving MOS transistor Q1.
The PFC current detection terminal PFCCS is connected to the source of the PFC driving MOS transistor Q1 through the eighth resistor.
A tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12 and a thirteenth resistor R13 are connected in series between the PFC voltage detection terminal PFCVS and the cathode of the sixteenth diode D16. Further, the PFC voltage detection terminal PFCVS is connected to the ground line through a ninth resistor R9, and the ninth resistor R9 is further connected in parallel with the sixth capacitor C6.
The half-bridge resonant circuit is used for realizing steady-state operation of voltage and current, and comprises a high-end driving MOS transistor Q2, a low-end driving MOS transistor Q3, a resonant capacitor C19, a resonant inductor L5 and a transformer T1; transformer T1 is a center tapped transformer.
The drain electrode of the high-end driving MOS tube Q2 is connected with the output end of the rectifying circuit through a sixteenth diode D16, the grid electrode of the high-end driving MOS tube Q2 is connected with the high-end driving end HSGD of the half bridge through a sixteenth resistor R36, and the source electrode of the high-end driving MOS tube Q2 is connected with the high-end ground end HSGND of the half bridge.
A thirtieth resistor R30 and a second diode D2 are connected between the half-bridge high-end ground end HSGND and the power supply end VCC, the thirtieth resistor R30 is connected between the power supply end and the anode of the second diode D2, and the cathode of the second diode D2 is connected with the half-bridge high-end ground end HSGND; further, a thirteenth capacitor C13 is connected between the cathode of the second diode D2 and the source of the high-side driving MOS transistor Q2.
The drain of the low-side driving MOS transistor Q3 is connected to the half-bridge high-side ground HSGND, the gate of the low-side driving MOS transistor Q3 is connected to the half-bridge low-side driving end LSGD through a seventeenth resistor R37, the source of the low-side driving MOS transistor Q3 is connected to the ground through an anti-vibration resistor group, and the anti-vibration resistor group includes a thirty-ninth resistor R39, a forty-fourth resistor R40, a forty-first resistor R41, and a forty-third resistor R43, which are connected in parallel.
One end of the resonant inductor L5 is connected to the high-end ground end HSGND of the half bridge, the other end of the resonant inductor L5 is connected to one pole of the resonant capacitor C19, the other pole of the resonant capacitor C19 is connected to the head end of the primary side of the transformer T1, and the tail end of the primary side of the transformer T1 is grounded. Furthermore, a power compensation capacitor C18 is connected in parallel to both ends of the primary side of the transformer T1.
Referring to fig. 2 and 6, the full-wave rectifier includes a first rectifying diode D12, a second rectifying diode D13, and an output capacitor C22. The anode of the first rectifying diode D12 is connected with the dotted terminal on the secondary side of the transformer T1, and the anode of the second rectifying diode D13 is connected with the terminal on the secondary side of the transformer T1; the cathode of the first rectifier diode D12 and the cathode of the second rectifier diode D13 are connected to the low-voltage side direct current positive bus, and the secondary side center tap of the transformer T1 is connected to the low-voltage side direct current negative bus; a low-voltage side direct-current negative bus grounding wire; the low-voltage side direct-current positive bus and the low-voltage side direct-current negative bus are used for connecting an LED load; the output capacitor C22 is connected between the low-side direct-current positive bus and the low-side direct-current negative bus. Further, a filter capacitor L6 is connected in series between the cathode of the first rectifying diode D12 and the output capacitor C22 on the low-side direct current positive bus.
Further, the output capacitor C22 is a non-electrolytic capacitor, which may be any one of a thin film capacitor, a non-polar capacitor, or a CBB capacitor.
Further, a secondary side of the transformer T1 is connected in parallel with a protective capacitor C20.
Further, an open-circuit protector is arranged in the full-wave rectifier, and the open-circuit protector comprises a bidirectional thyristor Q8, an auxiliary capacitor C21, a protection diode D14, a transistor Q9, a fifty-first capacitor R50, a fifty-first resistor R51, a fifty-second resistor R52 and a fifty-third resistor R53; a first anode of the bidirectional thyristor Q8 is connected with the filter capacitor L6, and a second anode of the bidirectional thyristor Q8 is connected with the low-voltage side direct-current negative bus; two ends of the auxiliary capacitor C21 are connected between the first anode of the bidirectional thyristor Q8 and the control end; two ends of a fifty-fifth capacitor R50 are connected between the first anode of the bidirectional thyristor Q8 and the control end; one end of a fifty-first resistor R51 is connected to the control end of the bidirectional thyristor Q8, the other end of the fifty-first resistor R51 is connected to the negative electrode of the protection diode D14, the positive electrode of the protection diode D14 is connected to the first electrode of the transistor Q9, and the second electrode of the transistor Q9 is connected to the low-voltage side direct-current negative bus; a fifty-second resistor R52 and a fifty-third resistor R53 are connected in series between the low-side direct-current positive bus and the low-side direct-current negative bus, and a third pole of the transistor Q9 is connected to a connection point between the fifty-second resistor R52 and the fifty-third resistor R53. The transistor Q9 comprises a Zener diode and a combined diode, and the cathode of the combined diode forms the first pole of the transistor Q9; the anode of the Zener diode is connected with the anode of the combined diode to form a second pole of the transistor Q9; the cathode of the zener forms the third pole of transistor Q9.
The implementation principle of the LED driving power supply starting circuit provided by the embodiment of the application is as follows: the rectification circuit converts power supply into specific voltage and current, for example, commercial power is converted into direct current voltage after passing through the rectification circuit, so that the primary rectification function is realized; the PFC circuit realizes an electrical isolation function, so that the safety of power supply equipment is ensured, and the danger from a high-voltage feeder is avoided; meanwhile, the device has a power factor correction function and is used for forcing the line current to follow the line voltage, so that the line current is sinusoidal, the power factor is improved, and the harmonic content is reduced; the inverter circuit realizes an inverter function, namely the frequency and the amplitude of the output voltage or current of the inverter are flexibly changed according to requirements by controlling the working frequency and the output time proportion of the inverter circuit. The resonant inductor L5 and the resonant capacitor C19 are connected in series to form a half-bridge resonant circuit, so that when the power supply is a direct-current power supply, the current in the circuit changes according to a sine rule. Because the current or the voltage changes according to a sine rule and has a zero crossing point, the high-end driving MOS transistor Q2 and the low-end driving MOS transistor Q3 are switched on or off regularly, so that the loss generated by the high-end driving MOS transistor Q2 and the low-end driving MOS transistor Q3 is zero, and the soft switching function is realized. The full-wave rectifier can be unidirectionally conducted by the filtered currents alternately output from the head end and the tail end of the secondary side of the transformer T1 by the first rectifying diode D12 and the second rectifying diode D13, and the conducted direct currents are collected in the low-voltage direct-current positive bus, so that the continuous current output can be realized by making full use of the positive and negative periodic currents. The LED driving power supply has the advantages that no electrolytic capacitor is generated, no electrolyte is generated, the LED driving power supply has almost no inductance, and the loss is not easy to occur at a high temperature generated by the LED driving power supply; the electrolytic capacitor has very high working electric field intensity and small volume, is beneficial to the miniaturization of the whole LED driving power supply, and can reduce the short service life of the LED driving power supply and prolong the service life of the LED driving power supply.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. A method for starting an LED driving power supply is characterized in that: the method comprises the following steps:
rectifying the input alternating voltage to obtain rectified voltage;
synchronously tracking the alternating current waveform of the constant current voltage so as to synchronize the alternating current waveform with the rectified voltage waveform to obtain synchronous current;
performing full-wave rectification on the synchronous current, and outputting direct current, wherein the direct current is used for supplying power to an LED load;
electrolytic-capacitor-free filtering is performed across the LED load.
2. The method for starting the LED driving power supply according to claim 1, wherein: after the synchronous current is obtained, the synchronous current is subjected to resonance filtering so as to reduce the ripple of the direct current.
3. The method for starting the LED driving power supply according to claim 1, wherein: and in the process of obtaining the rectified voltage, the alternating voltage is subjected to absorption ultrahigh frequency signal processing.
4. The utility model provides a LED drive power supply starting circuit which characterized in that: the method comprises the following steps:
a rectifying circuit;
the PFC circuit comprises a PFC controller, wherein the PFC controller comprises a power supply end VCC, a half-bridge high-end driving end HSGD, a half-bridge high-end ground end HSGND and a half-bridge low-end driving end LSGD;
the half-bridge resonant circuit is used for realizing steady-state operation of voltage and current; the half-bridge resonant circuit comprises a high-side drive MOS tube Q2, a low-side drive MOS tube Q3, a resonant capacitor C19, a resonant inductor L5 and a transformer T1; the transformer T1 is a center tap transformer;
the drain electrode of the high-side driving MOS tube Q2 is connected with the output end of the rectifying circuit, the gate electrode of the high-side driving MOS tube Q2 is connected with the high-side driving end HSGD of the half bridge, and the source electrode of the high-side driving MOS tube Q2 is connected with the high-side ground end HSGND of the half bridge;
the drain of the low-side driving MOS transistor Q3 is connected to a half-bridge high-side ground terminal HSGND, the gate of the low-side driving MOS transistor Q3 is connected to a half-bridge low-side driving terminal LSGD, and the source of the low-side driving MOS transistor Q3 is connected to the ground;
one end of the resonant inductor L5 is connected with a half-bridge high-end ground end HSGND, the other end of the resonant inductor L5 is connected with one pole of a resonant capacitor C19, the other pole of the resonant capacitor C19 is connected with the head end of the primary side of a transformer T1, and the tail end of the primary side of the transformer T1 is grounded;
a full wave rectifier comprising a first rectifying diode D12, a second rectifying diode D13, and an output capacitor C22;
the anode of the first rectifying diode D12 is connected with the head end of the secondary side of the transformer T1, and the anode of the second rectifying diode D13 is connected with the tail end of the secondary side of the transformer T1; the cathode of the first rectifier diode D12 and the cathode of the second rectifier diode D13 are connected to a low-voltage side direct current positive bus, and the secondary side center tap of the transformer T1 is connected to a low-voltage side direct current negative bus;
the low-voltage side direct-current negative bus grounding wire;
the low-voltage side direct-current positive bus and the low-voltage side direct-current negative bus are used for connecting an LED load; the output capacitor C22 is connected between the low-voltage side direct current positive bus and the low-voltage side direct current negative bus;
the output capacitor is a non-electrolytic capacitor.
5. The LED driving power supply starting circuit according to claim 4, wherein: and the head end and the tail end of the primary side of the transformer T1 are connected with a power compensation capacitor C18 in parallel.
6. The LED driving power supply starting circuit according to claim 4, wherein: and a filter capacitor L6 is connected in series between the cathode of the first rectifying diode D12 and the output capacitor C22 in the low-voltage side direct current positive bus.
7. The LED driving power supply starting circuit according to claim 4, wherein: the capacitor without electrolysis is any one of a thin film capacitor, a non-polar capacitor or a CBB capacitor.
8. The LED driving power supply starting circuit according to claim 4, wherein: the secondary side of the transformer T1 is connected in parallel with a protective capacitor C20.
9. The LED driving power supply starting circuit according to claim 4, wherein: an open-circuit protector is arranged in the full-wave rectifier and comprises a bidirectional thyristor Q8, an auxiliary capacitor C21, a protection diode D14, a transistor Q9, a fifty-first capacitor R50, a fifty-first resistor R51, a fifty-second resistor R52 and a fifty-third resistor R53;
a first anode of the bidirectional thyristor Q8 is connected with a filter capacitor L6, and a second anode of the bidirectional thyristor Q8 is connected with a low-voltage side direct-current negative bus;
two ends of the auxiliary capacitor C21 are connected between the first anode of the bidirectional thyristor Q8 and the control end;
two ends of the fifty-fifth capacitor R50 are connected between the first anode of the bidirectional thyristor Q8 and the control end;
one end of the fifty-first resistor R51 is connected to the control end of the bidirectional thyristor Q8, the other end of the fifty-first resistor R51 is connected to the negative electrode of the protection diode D14, the positive electrode of the protection diode D14 is connected to the first electrode of the transistor Q9, and the second electrode of the transistor Q9 is connected to the low-voltage side direct-current negative bus;
the fifty-second resistor R52 and the fifty-third resistor R53 are connected in series between the low-voltage-side direct-current positive bus and the low-voltage-side direct-current negative bus, and the third pole of the transistor Q9 is connected to a connection point between the fifty-second resistor R52 and the fifty-third resistor R53.
10. The LED driving power supply starting circuit according to claim 4, wherein: the model of the PFC controller is ICB2FL 03G.
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