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CN112788814B - Non-isolated AC-DC constant current driver and LED lighting equipment - Google Patents

Non-isolated AC-DC constant current driver and LED lighting equipment Download PDF

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Publication number
CN112788814B
CN112788814B CN202110114151.XA CN202110114151A CN112788814B CN 112788814 B CN112788814 B CN 112788814B CN 202110114151 A CN202110114151 A CN 202110114151A CN 112788814 B CN112788814 B CN 112788814B
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main
auxiliary
port
converter
voltage
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CN112788814A (en
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胡炎申
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Moso Power Supply Technology Co ltd
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Moso Power Supply Technology Co ltd
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/345—Current stabilisation; Maintaining constant current
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/355—Power factor correction [PFC]; Reactive power compensation
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits

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Abstract

The application discloses a non-isolated AC-DC constant current driver and LED lighting equipment, wherein the former comprises a non-isolated PFC main converter and a DC-DC auxiliary converter; the non-isolated PFC main converter comprises a main input port, a PFC power conversion unit, a voltage converter and a main output port, wherein the voltage converter comprises a main winding and an auxiliary winding; the DC-DC auxiliary converter comprises an auxiliary input port and an auxiliary output port; the input end of the PFC power conversion unit is connected with the main input port, and the output end of the PFC power conversion unit is connected with one end of the main winding; the other end of the main winding is connected with a main output port; the auxiliary winding is connected with the auxiliary input port; the auxiliary output port is connected in series with the main output port. In the application, only a part of electric energy is provided to the load through two-stage conversion, and compared with the condition that all the power is subjected to two-stage conversion, the power consumption is reduced, and the overall conversion efficiency is improved.

Description

Non-isolated AC-DC constant current driver and LED lighting equipment
Technical Field
The application relates to the technical field of circuits, in particular to a non-isolated alternating current-direct current (ALTERNATING CURRENT TO DIRECT CURRENT, alternating current-direct current) constant current driver and a light emitting diode (LIGHT EMITTING diode) lighting device.
Background
The LED is applied to lighting equipment, and has advantages of wide color gamut, high brightness, large visual angle, low power consumption, long service life, etc., so that the LED lighting equipment is widely used in various lighting display fields. Such as more common stock exchange and financial information display, airport flight dynamic information display, port and station passenger guiding information display, stadium information display, road traffic information display, power dispatching and vehicle dynamic tracking and other dispatching command center information display, market shopping center and other service field business propaganda information display, advertisement media products and the like.
In general, the LED lighting device needs a driving power source for driving normally, and the driving power source is generally a constant current driver, and when the power of the LED lighting device is relatively large, the constant current driver needs to have a power factor correction (power factor correction, PFC) function.
Current constant current drivers include both single stage and multi-stage. The single-stage constant current driver has simple structure and lower cost, but cannot simultaneously input high power factor and output low ripple, and even the power tube has too high voltage or current stress. Accordingly, the industry generally selects multi-stage constant current drivers, which are more common in two stages, wherein a pre-stage PFC converter is used to regulate the input power factor and to balance the input and output energy; and a subsequent stage direct current-direct current (direct current to direct current, DC-DC) auxiliary converter is used to regulate the output voltage and reduce the output ripple voltage or current.
However, the ac output of the two-stage constant current driver is converted into total output by two-stage full power, and the power consumption is relatively large, resulting in low overall conversion rate.
Disclosure of Invention
The application aims to provide a non-isolated AC-DC constant current driver and LED lighting equipment, which have lower power consumption and higher overall conversion efficiency.
A first aspect of the present application provides a non-isolated AC-DC constant current driver comprising: a non-isolated PFC main converter and a DC-DC auxiliary converter; the non-isolated PFC main converter comprises a main input port, a PFC power conversion unit, a voltage converter and a main output port, wherein the voltage converter comprises a main winding and an auxiliary winding; the DC-DC auxiliary converter comprises an auxiliary input port and an auxiliary output port; the input end of the PFC power conversion unit is connected with the main input port, and the output end of the PFC power conversion unit is connected with one end of the main winding; the other end of the main winding is connected with a main output port; the auxiliary winding is connected with the auxiliary input port; the auxiliary output port is connected in series with the main output port; the PFC power conversion unit is used for: converting alternating current input through a main input port into direct current and transmitting the direct current to a voltage converter; the voltage converter is used for: transmitting the received direct current to a main output port through a main winding, and transmitting the received direct current to a DC-DC auxiliary converter through an auxiliary winding and an auxiliary input port; the DC-DC auxiliary converter is used for: and processing the received direct current and transmitting the processed direct current to an auxiliary output port.
In one embodiment, the non-isolated AC-DC constant current driver further comprises: a PFC controller; the non-isolated PFC main converter further includes: a main power switching tube; the main power switching tube is connected between the output end of the PFC power conversion unit and one end of the main winding; or the main power switch tube is connected with the other end of the main winding; the PFC controller comprises a main feedback port, a first main acquisition port, a main control port, a main reference voltage port and a main reference sawtooth wave signal port; the main feedback port is connected with the main output port, the first main acquisition port is connected with the auxiliary winding, and the main control port is connected with the control end of the main power switch tube; the PFC controller is used for: receiving a main voltage of a main output port through a main feedback port, receiving a voltage of an auxiliary winding through a first main acquisition port, receiving a main reference voltage through a main reference voltage port, and receiving a main reference sawtooth wave signal through a main reference sawtooth wave signal port; and then, the main voltage of the main output port, the voltage of the auxiliary winding, the main reference voltage and the main reference sawtooth wave signal are utilized to control the on and off of the main power switch tube.
In one embodiment, the PFC controller further comprises a second primary acquisition port; the second main acquisition port is connected with the main power switch tube; the PFC controller is further configured to: and receiving the voltage of the main power switch tube through the second main acquisition port.
In one embodiment, the non-isolated PFC main converter further includes: a first main acquisition member and a second main acquisition member; the first main acquisition part is connected between the second main acquisition port and the main power switch tube, and the second main acquisition part is connected between the first main acquisition port and the auxiliary winding; the second main acquisition port acquires the voltage of the main power switch tube through the first main acquisition piece, and the first main acquisition port acquires the voltage of the auxiliary winding through the second main acquisition piece.
In one embodiment, a PFC controller includes a primary reference voltage source, a primary reference sawtooth signal source, a first primary comparator, a second primary comparator, a third primary comparator, and a trigger; the trigger is provided with an S port, a Q port and an R port; the negative input end of the first main comparator is connected with the main feedback port, the positive input end of the first main comparator is connected with the main reference voltage source through the main reference voltage port, and the output end of the first main comparator is connected with the positive input end of the second main comparator; the negative input end of the second main comparator is connected with the second main acquisition port, and the output end of the second main comparator is connected with the positive input end of the third main comparator; the negative input end of the third main comparator is connected with the main reference sawtooth wave signal source through a main reference sawtooth wave signal port, and the output end of the third main comparator is connected with the R port; the Q port is connected with the main control port, and the S port is connected with the first main acquisition port.
In one embodiment, the non-isolated AC-DC constant current driver further comprises: a DC-DC controller; the DC-DC auxiliary converter further includes: an auxiliary power switching tube; the DC-DC controller comprises an auxiliary feedback port, an auxiliary control port, an auxiliary reference current port and an auxiliary reference sawtooth wave signal port; the auxiliary feedback port is connected with the auxiliary output port, and the auxiliary control port is connected with the control end of the auxiliary power switch tube; the DC-DC controller is used for: receiving current provided by the auxiliary output port and the main output port after being connected in series through the auxiliary feedback port, receiving auxiliary reference current through the auxiliary reference current port, and receiving auxiliary reference sawtooth wave signals through the auxiliary reference sawtooth wave signal port; and then, the current, the auxiliary reference current and the auxiliary reference sawtooth wave signal which are provided after the auxiliary output port and the main output port are connected in series are utilized to control the on and off of the auxiliary power switch tube.
In one embodiment, the DC-DC auxiliary converter further comprises: an auxiliary acquisition piece; the auxiliary acquisition piece is connected between the auxiliary output port and the auxiliary feedback port; the auxiliary output port is connected in series with the main output port through the auxiliary acquisition part to acquire the current provided by the auxiliary output port and the main output port.
In one embodiment, a DC-DC controller includes: the first auxiliary comparator, the second auxiliary comparator, the auxiliary reference current source and the auxiliary reference sawtooth wave signal source; the negative input end of the first auxiliary comparator is connected with the auxiliary output port, the positive input end of the first auxiliary comparator is connected with the auxiliary reference current source through the auxiliary reference current port, and the output end of the first auxiliary comparator is connected with the positive input end of the second auxiliary comparator; the negative input end of the second auxiliary comparator is connected with the auxiliary reference sawtooth wave signal source through an auxiliary reference sawtooth wave signal port, and the output end of the second auxiliary comparator is connected with the auxiliary control port.
In one embodiment, the non-isolated PFC main converter includes one of a buck converter, a boost converter, a buck-boost converter, a hill-k converter, a single-ended primary inductive converter, and a zero-voltage switching converter; the DC-DC auxiliary converter comprises one of a buck converter, a boost converter, a buck-boost converter, a flyback converter, a forward converter, a Cuck converter, a single-ended primary inductive converter and a zero-voltage switching converter.
A second aspect of the application provides an LED lighting device comprising a non-isolated AC-DC constant current driver according to any of the first aspects of the application.
In the application, when the non-isolated AC-DC constant current driver provided by the embodiment is applied, the main input port is connected with an alternating current power supply, and the main output port and the auxiliary output port are connected in series and then connected with a load. Wherein, part of the electric energy provided by the alternating current power supply is transmitted to the load through the single conversion, and part of the electric energy is transmitted to the load through the primary conversion and the secondary conversion. That is, only a part of electric energy is provided to the load through two-stage conversion, and compared with the condition that all the power is subjected to two-stage conversion, the power consumption is reduced, and the overall conversion efficiency is improved.
Drawings
In order to more clearly illustrate the technical solution of the present application, the drawings that are required to be used in the embodiments will be briefly described.
FIG. 1 is a schematic diagram of a non-isolated AC-DC constant current driver provided by one embodiment of the present application;
FIG. 2 is a schematic diagram of a non-isolated AC-DC constant current driver according to another embodiment of the present application;
FIG. 3 is a schematic diagram of a non-isolated AC-DC constant current driver according to another embodiment of the present application;
FIG. 4 is a schematic diagram of a non-isolated AC-DC constant current driver according to another embodiment of the present application;
fig. 5 is a schematic diagram of a non-isolated PFC main converter according to an alternative embodiment of the present application;
Fig. 6 is a schematic diagram of a non-isolated PFC main converter according to an alternative embodiment of the present application;
FIG. 7 is a schematic diagram of a DC-DC auxiliary converter provided by an alternative embodiment of the application;
FIG. 8 is a schematic diagram of a DC-DC auxiliary converter provided by an alternative embodiment of the application;
FIG. 9 is a schematic diagram of a DC-DC auxiliary converter provided by an alternative embodiment of the application;
fig. 10 is a schematic diagram of a DC-DC auxiliary converter provided by an alternative embodiment of the application.
Reference numerals illustrate:
Non-isolated PFC main converter 10, PFC power conversion unit 11, voltage converter 12, main winding 121, auxiliary winding 122, DC-DC auxiliary converter 20, PFC controller 30, DC-DC controller 40, ac power supply 50, load 60, main input ports 1,2, main output ports 3, 4, auxiliary input ports 5,6, auxiliary output ports 7, 8.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application.
Referring to fig. 1 to 10, an embodiment of the present application provides a non-isolated AC-DC constant current driver, which includes a non-isolated PFC main converter 10 and a DC-DC auxiliary converter 20.
Wherein the non-isolated PFC main converter 10 comprises a main input port, a PFC power conversion unit 11, a voltage converter 12 and a main output port, the voltage converter 12 comprising a main winding 121 and an auxiliary winding 122; the DC-DC auxiliary converter 20 includes an auxiliary input port and an auxiliary output port. An input end of the PFC power conversion unit 11 is connected with a main input port, and an output end of the PFC power conversion unit 11 is connected with one end of a main winding 121; the other end of the main winding 121 is connected with a main output port; the auxiliary winding 122 is connected with an auxiliary input port; the auxiliary output port is connected in series with the main output port.
Specifically, the PFC power conversion unit 11 converts ac power input through the main input port into dc power and transmits the dc power to the voltage converter 12; the voltage converter 12 transmits the received direct current to the main output port via the main winding 121, and transmits the received direct current to the DC-DC auxiliary converter 20 via the auxiliary winding 122 and the auxiliary input port; the DC-DC auxiliary converter 20 processes the received direct current and transmits the processed direct current to the auxiliary output port.
When the non-isolated AC-DC constant current driver according to the above embodiment is applied, the main input port is connected to the AC power supply 50, and the main output port and the auxiliary output port are connected in series and then connected to the load 60. Of course, the load 60 may be any device that needs power, and in the embodiment of the present application, for convenience of description, an LED string is described as the load 60. The main output port provides the main voltage Vo1 for the load 60, the auxiliary output port provides the auxiliary voltage Vo2 for the load 60, and then the total voltage of the load 60 is the sum of the main voltage Vo1 and the auxiliary voltage Vo 2. The main output port forms a direct current bus.
After the alternating current power supply 50 and the LED lamp string are connected, the current provided by the alternating current power supply 50 is directly output to the LED lamp string in the form of main voltage Vo1 from a main output port after passing through the PFC power conversion unit 11 and the main winding 121; and the current supplied from the ac power supply 50 is converted into a voltage through the PFC power conversion unit 11 and the auxiliary winding 122, and then outputted from the auxiliary output port to the DC-DC auxiliary converter 20 in the form of an auxiliary voltage Vo2, and the DC-DC auxiliary converter 20 adjusts the voltage and then outputs the voltage to the LED string.
As can be seen from the above, the PFC power conversion unit 11 outputs power to the load 60 in part through only a single stage conversion. The DC-DC auxiliary converter 20 supplies the load 60 with a part of the power subjected to two-stage conversion, that is, only a part of the power is subjected to two-stage conversion as a whole, so that the power consumption can be reduced in comparison with a mode in which all the output power is subjected to two-stage conversion.
In an alternative embodiment, the resistance of the main winding 121 is smaller than the resistance of the auxiliary winding 122, so that the voltage of the main winding 121 is greater than the voltage of the auxiliary winding 122, i.e. the main voltage is greater than the auxiliary voltage, and the output power of the main output port is greater than the output power of the auxiliary output port, for the same current. Thereby, the conversion efficiency can be improved better.
Specifically, assuming that the conversion efficiency of the non-isolated PFC main converter 10 is η PFC and the conversion efficiency of the DC-DC auxiliary converter 20 is η DC-DC,PPFC、PDC-DC、Pout, which are the output power of the non-isolated PFC main converter 10, the output power of the DC-DC auxiliary converter 20, and the overall output power, respectively, the overall efficiency is:
let P DC-DC＝10％xPout be: Let η DC-DC =90%, the overall conversion efficiency η total＝98.9％xηPFC.
From the above, if the output power of the DC-DC auxiliary converter 20 is 10%, the overall efficiency η total approaches 99% even if the conversion efficiency of the DC-DC auxiliary converter 20 is as low as 90%, which is very close to the conversion efficiency of a pure single-stage converter directly provided to the LED string. Therefore, the non-isolated AC-DC constant current driver provided by the embodiment of the application has lower power loss and can improve the overall efficiency.
It follows that PFC power conversion unit 11 provides most of the output power to the LED string and is only a single stage power conversion. The DC-DC auxiliary converter 20 provides a small portion of the output power to the light string, and although the power provided by the DC-DC auxiliary converter 20 is subjected to two-stage conversion, it only processes a small portion of the output power, i.e., only a small portion of the output power is subjected to two-stage conversion.
As can be seen from the above, in the embodiment of the application, most of the electric power provided by the ac power source 50 is transmitted to the LED string through the single conversion, and a small part of the electric power is transmitted to the LED string through the primary and secondary conversion. Therefore, the power consumption is reduced, and the overall conversion efficiency is improved. In addition, since the DC-DC auxiliary converter 20 converts only a small portion of the electric power, the internal device voltage and current stress thereof are also relatively small, so that the component cost can be reduced.
The voltage converter 12 may be a double winding type transformer or inductor L1 having a main winding 121 and an auxiliary winding 122.
In an alternative embodiment, referring to fig. 2, the non-isolated AC-DC constant current driver further includes a PFC controller 30; the non-isolated PFC main converter 10 also includes a main power switch Q1.
The main power switching tube Q1 is connected between the output end of the PFC power conversion unit 11 and one end of the main winding 121; or the main power switching tube Q1 is connected to the other end of the main winding 121.
The PFC controller 30 includes a main feedback port a1, a first main acquisition port a2, a main control port a3, a main reference voltage port a4, and a main reference sawtooth signal port a5; the main feedback port a1 is connected with the main output port, the first main acquisition port a2 is connected with the auxiliary winding 122, and the main control port a3 is connected with the control end of the main power switch tube Q1.
The PFC controller 30 is configured to receive the main voltage Vo1 output from the main output port through the main feedback port a1, receive the voltage of the auxiliary winding 122 through the first main acquisition port a2, receive the main reference voltage through the main reference voltage port a4, and receive the main reference sawtooth wave signal through the main reference sawtooth wave signal port a 5; and then controls the on and off of the main power switching tube Q1 by using the main voltage Vo1 of the main output port, the voltage of the auxiliary winding 122, the main reference voltage and the main reference sawtooth wave signal.
Specifically, the PFC controller 30 controls the following: after receiving the main voltage Vo1 from the main output port of the main feedback port a1 and the main reference voltage from the main reference voltage port a4, the main voltage Vo1 and the main reference voltage are compared to form a voltage error signal. After receiving the main reference sawtooth wave signal from the main reference sawtooth wave signal port a5, the main reference sawtooth wave signal and the voltage error signal are compared, and a stop pulse signal is formed according to the comparison result. After receiving the voltage of the auxiliary winding 122 from the first main acquisition port a2, a start pulse signal is formed by using the voltage of the auxiliary winding 122. And controlling the on and off of the main power switch tube Q1 by using the stop pulse signal and the start pulse signal.
That is, the main voltage Vo1 of the main output port is fed back to the PFC controller 30 through the main feedback port a1, the main reference voltage is supplied to the PFC controller 30 through the main reference voltage port a4, and the PFC controller 30 compares the main voltage Vo1 with the main reference voltage and then forms a voltage error signal. Next, the PFC controller 30 compares the voltage error signal with the main reference sawtooth signal to generate a stop pulse signal; the PFC controller 30 may then control the turn-off of the main power switching tube Q1 using the stop pulse signal. The voltage of the auxiliary winding 122 is fed back to the PFC controller 30 through the first main acquisition port a2, and the PFC controller 30 generates a start pulse signal using the voltage of the auxiliary winding 122; the PFC controller 30 then uses the start pulse signal to control the turn-on of the main power switching transistor Q1. The stop pulse signal and the start pulse signal form a pulse width modulation (pulse width modulation, PWM) control signal, and the on-off of the main power switch tube Q1 can be controlled by the PWM control signal.
The control mode can control the main voltage Vo1 of the main output port in a closed loop manner, and can realize that the input current and the output voltage are same-frequency and same-phase sine waves so as to achieve power factor correction and better power factor, thereby realizing zero pollution to a power grid.
In an alternative embodiment, referring to fig. 2, pfc controller 30 further includes a second main acquisition port a6; the second main acquisition port a6 is connected with the main power switch tube Q1. The voltage of the main power switch tube Q1 is received through the second main acquisition port a 6. The PFC controller 30 compares the voltage error signal with the voltage of the main power switching tube Q1 before comparing the main reference sawtooth signal with the voltage error signal, and then compares the comparison result with the main reference sawtooth signal. The peak current of the main power switching transistor Q1 can thereby be controlled.
In an alternative embodiment, referring to fig. 4, the non-isolated PFC main converter 10 further includes a first main harvesting component and a second main harvesting component; the first main acquisition element is connected between the second main acquisition port a6 and the main power switch tube Q1, and the second main acquisition element is connected between the first main acquisition port a2 and the auxiliary winding 122. The second main acquisition port a6 acquires the voltage of the main power switching tube Q1 through the first main acquisition member, and the first main acquisition port a2 acquires the voltage of the auxiliary winding 122 through the second main acquisition member. Alternatively, the first main collecting element and the second main collecting element may be a resistor Ri and a resistor Rdem, respectively.
By arranging the first main acquisition part and the second main acquisition part, PFC control can be facilitated to accurately acquire required signals, and accuracy of the PFC controller 30 for controlling the main power switching tube Q1 is improved.
In an alternative embodiment, referring to fig. 4, the pfc controller 30 includes a main reference voltage source Vref, a main reference sawtooth signal source Vramp1, a first main comparator U1, a second main comparator U2, a third main comparator U3, and a trigger U4; flip-flop U4 has an S port, a Q port, and an R port.
The negative input end of the first main comparator U1 is connected with the main feedback port a1, the positive input end of the first main comparator U1 is connected with the main reference voltage source Vref through the main reference voltage port a4, and the output end of the first main comparator U1 is connected with the positive input end of the second main comparator U2; the negative input end of the second main comparator U2 is connected with the second main acquisition port a6, and the output end of the second main comparator U2 is connected with the positive input end of the third main comparator U3; the negative input end of the third main comparator U3 is connected with a main reference sawtooth wave signal source Vramp1 through a main reference sawtooth wave signal port a5, and the output end of the third main comparator U3 is connected with an R port; the Q port is connected with the main control port a3, and the S port is connected with the first main acquisition port a 2.
Specifically, after the first main comparator U1 receives the main voltage Vo1 and the main reference voltage of the main output port, compares the main voltage Vo1 and the main reference voltage of the main output port, and then outputs a voltage error signal to the second main comparator U2. After receiving the voltage error signal and the voltage of the main power switch tube Q1, the second main comparator U2 controls the peak current of the main power switch tube Q1, compares the voltage error signal with the voltage of the main power switch tube Q1, and outputs the processed voltage error signal to the third main comparator U3. After receiving the processed voltage error signal and the main reference sawtooth wave signal, the third main comparator U3 compares the processed voltage error signal with the main reference sawtooth wave signal and then outputs a comparison result to the R end of the contactor; the contactor generates a stop pulse signal according to the comparison result, and outputs the stop pulse signal to the control end of the main power switch tube Q1 through the Q end of the contactor so as to control the turn-off of the main power switch tube Q1. After the contactor receives the voltage of the auxiliary winding 122 through the S terminal, a start pulse signal is generated by using the voltage of the auxiliary winding 122; and then, outputting a starting pulse signal to a control end of the main power switching tube Q1 through the Q end so as to control the on of the main power switching tube Q1.
The PFC controller 30 with the above structure can realize the precise control of the non-isolated PFC main converter 10, and has the advantages of simple manufacture, low cost and high control precision.
In an alternative embodiment, referring to fig. 2 and 3, the non-isolated AC-DC constant current driver further includes a DC-DC controller 40; the DC-DC auxiliary converter 20 further includes an auxiliary power switching tube Q2.
Wherein the DC-DC controller 40 includes an auxiliary feedback port b1, an auxiliary control port b2, an auxiliary reference current port b3, and an auxiliary reference sawtooth signal port b4; the auxiliary feedback port b1 is connected with the auxiliary output port, and the auxiliary control port b2 is connected with the control end of the auxiliary power switch tube Q2. The DC-DC controller 40 is configured to: receiving current provided by the auxiliary output port and the main output port after being connected in series through an auxiliary feedback port b1, receiving auxiliary reference current through an auxiliary reference current port b3 and receiving auxiliary reference sawtooth wave signals through an auxiliary reference sawtooth wave signal port b4; and then, the current, the auxiliary reference current and the auxiliary reference sawtooth wave signal provided after the auxiliary output port and the main output port are connected in series are utilized to control the on and off of the auxiliary power switch tube Q2.
Specifically, the auxiliary output port and the main output port are connected in series to provide electric energy for the LED lamp string, so that the current provided by the auxiliary output port and the main output port after being connected in series is actually the current of the LED lamp string.
The DC-DC controller 40 receives the current of the LED string fed back from the auxiliary output port, and compares the current of the LED string with the auxiliary reference current after receiving the auxiliary reference current from the auxiliary reference current port b3, and then forms a voltage error signal according to the comparison result; and then comparing the voltage error signal with the auxiliary reference sawtooth wave signal, generating a control signal of the auxiliary power switching tube Q2 according to the comparison result, and controlling the on and off of the auxiliary power switching tube Q2 by using the control signal. Therefore, the control strategy can realize the closed-loop control of the current of the LED lamp string.
In addition, the control strategy of the PFC controller 30 and the control strategy of the DC-DC controller 40 may further implement that the ripple of the main voltage Vo1 of the main output port and the ripple of the auxiliary voltage Vo2 of the auxiliary output port are reversely overlapped to cancel each other, so as to reduce the ripple of the total output voltage Vo, thereby reducing the ripple of the current of the LED string.
In detail, the purpose of the ripple reverse superposition of the main voltage Vo1 and the auxiliary voltage Vo2 is to reduce or cancel the power frequency ripple. The main voltage Vo1 of the main output port has a power frequency ripple, but is connected in series with the auxiliary voltage Vo2 of the auxiliary output port, and the reference signal in the current feedback loop of the DC-DC controller 40 of the DC-DC auxiliary converter 20 is an auxiliary reference current Iref, which is a DC reference signal.
In addition, the switching frequency of the DC-DC auxiliary converter 20 is far higher than that of the non-isolated PFC main converter 10, so that the dynamic response speed of the DC-DC auxiliary converter 20 is extremely fast, and the total current Ios of the total output port formed by connecting the auxiliary output port and the main output port in series can be theoretically equal to Iref in real time, so that the total current Ios is also infinitely close to a direct current value. Meanwhile, the main output port and the auxiliary output port are in series connection, so that the total current of the total output port formed by connecting the auxiliary output port and the main output port in series is equal to the current of the auxiliary output port, the current of the auxiliary output port is a direct current value, and the total current is also a direct current value, which is equivalent to canceling the power frequency ripple wave output by the main output port.
From the above, the DC-DC auxiliary converter 20 is a fast loop control and the non-isolated PFC main converter 10 is a slow loop control. In the application, in order to eliminate the power frequency ripple of the main output port, the main output port and the auxiliary output port are connected in series, so that the current of the main output port, the current of the auxiliary output port and the total current are equal.
The DC-DC controller 40 controls only the output current Ios, and the main voltage Vo1 or the total voltage Vo is controlled through the PFC controller 30. The reason for this is that if the magnitude of the total voltage output is smaller than the magnitude of the voltage for maintaining the normal operation of the load LED, the DC-DC controller 40 alone controls the output DC current required for maintaining the load, so that on the one hand, a sufficiently high output voltage required for maintaining the load is required; on the other hand, when the total output voltage amplitude reaches the load requirement, an output direct current required by the load is maintained by the DC-DC controller 40, and the output current is infinitely made to be a direct current value without power frequency ripple waves by a quick feedback loop of the DC-DC controller 40. Therefore, the method can meet the requirements of load working voltage and current, and can eliminate power frequency ripple waves.
In an alternative embodiment, referring to fig. 4, the DC-DC auxiliary converter 20 further includes an auxiliary collector. The auxiliary output port is connected in series with the main output port through the auxiliary acquisition part to acquire the current provided by the auxiliary output port and the main output port. Alternatively, the auxiliary collecting member may be a resistor Ro. The auxiliary acquisition part can convert the current of the LED lamp string into voltage and provide the voltage to the auxiliary feedback port b1.
In an alternative embodiment, referring to fig. 4, the DC-DC controller 40 includes a first auxiliary comparator U5, a second auxiliary comparator U6, an auxiliary reference current source Iref, and an auxiliary reference sawtooth signal source Vramp2. The negative input end of the first auxiliary comparator U5 is connected with the auxiliary feedback port b1, the positive input end of the first auxiliary comparator U5 is connected with the auxiliary reference current source Iref through the auxiliary reference current port b3, and the output end of the first auxiliary comparator U5 is connected with the positive input end of the second auxiliary comparator U6; the negative input end of the second auxiliary comparator U6 is connected with an auxiliary reference sawtooth wave signal source Vramp2 through an auxiliary reference sawtooth wave signal port b4, and the output end of the second auxiliary comparator U6 is connected with an auxiliary control port b 2.
Specifically, the resistor Ro detects the current of the LED string and converts the current into a voltage signal, so that the total current Ios forming feedback is transmitted to the negative input end of the first auxiliary comparator U5, and after receiving the auxiliary reference current from the auxiliary reference current port b3, the first auxiliary comparator U5 compares the total current Ios with the auxiliary reference current, and then outputs a voltage error signal formed according to the comparison result to the second auxiliary comparator U6; after receiving the voltage error signal and the auxiliary reference sawtooth wave signal, the second auxiliary comparator U6 compares the voltage error signal with the auxiliary reference sawtooth wave signal, generates a control signal of the auxiliary power switching tube Q2 according to the comparison result, and then outputs the control signal to the control end of the auxiliary power switching tube Q2 so as to control the on and off of the auxiliary power switching tube Q2. The DC-DC controller 40 of the above-described structure is simple in structure, high in control accuracy, and low in cost. It is understood that the control signal is a PWM control signal.
In an alternative embodiment, the non-isolated PFC main converter 10 includes one of a buck converter, a boost converter, a buck-boost converter, a hill-k converter, a single-ended primary inductive converter, and a zero-voltage switching converter; the DC-DC auxiliary converter 20 includes one of a buck converter, a boost converter, a buck-boost converter, a flyback converter, a forward converter, a hill-k converter, a single-ended primary inductive converter, and a zero-voltage switching converter.
The non-isolated PFC main converter 10 includes a PFC power conversion unit 11, a rectifier diode D5, a rectifier diode Db, a voltage converter 12, and a main power switching tube Q1. The several cells may constitute a non-isolated PFC main converter 10 of the buck, boost and buck-boost converters. The main power switch Q1 also has a body diode D Q1. The main input ports include a main input port 1 and a main input port 2. The main output ports include a main output port 3 and a main output port 4.
Specifically, referring to fig. 4, the PFC power conversion unit 11 may include an LC filter circuit, a diode full-bridge rectifier circuit, and a filter capacitor Cin. The LC filter circuit comprises a capacitor Cf and an inductor Lf, two half-bridge circuits of the diode full-bridge rectifying circuit, one half-bridge circuit is formed by connecting diodes D1 and D3 in series, the other half-bridge circuit is formed by connecting diodes D2 and D4 in series, D1 and D2 are located at the upper part, and D3 and D4 are located at the lower part. D1 and D3 have a first node between them and D2 and D4 have a second node between them. One end of the inductor Lf is connected with one pole of the alternating current power supply 50 through the main input port 1, and the other end of the inductor Lf is connected with a first node; one end of the capacitor Cf is connected to the other end of the inductor Lf, and the other end of the capacitor Cf and the second node are both connected to the other pole of the ac power supply 50 through the main input port 2. The half-bridge formed by the filter capacitors Cin and D2 and D4 is connected in parallel. In addition, the two half-bridges and the filter capacitor Cin are connected in parallel and then grounded.
Referring to fig. 4, the following details of the configuration of the buck converter type non-isolated PFC main converter 10 are provided:
The drain electrode of the main power switch tube Q1 is connected with one end of the filter capacitor Cin, the source electrode of the main power switch tube Q1 is connected with the main winding 121, and the grid electrode of the main power switch tube Q1 is connected with the Q end of the trigger U4. One end of the rectifying diode D5 is connected with the source electrode of the power switch tube, and the other end of the rectifying diode D is grounded. The rectifier diode Db is connected between one end of the auxiliary winding 122 and the auxiliary input port 5, and the other end of the auxiliary winding 122 is grounded.
Referring to fig. 5, the following details of the construction of a boost converter type non-isolated PFC main converter 10 are provided:
One end of the main winding 121 is connected with the filter capacitor Cin, and the other end is connected with one end of the rectifier diode D5; the other end of the rectifying diode D5 is connected with the main output port 3; one end of the auxiliary winding 122 is connected to the auxiliary input port 5 through the rectifier diode Db, and the other end of the auxiliary winding 122 is directly connected to the auxiliary input port 6. The source of the main power switch tube Q1 is connected with the main output port 4, the drain is connected between the main winding 121 and the rectifying diode D5, and the grid is connected with the Q end of the trigger U4.
Referring to fig. 6, the following details of the construction of a buck-boost converter type non-isolated PFC main converter 10 are provided:
The source electrode of the main power switch tube Q1 is connected with the main output port 4, the drain electrode is connected with the filter capacitor Cin, and the grid electrode is connected with the Q end of the trigger U4; one end of the main winding 121 is connected between the source electrode of the main power switch tube Q1 and the main output port 4, the other end is connected between the filter capacitor Cin and one end of the rectifying diode D5, and the other end of the rectifying diode D5 is connected with the main output port 3; the rectifier diode Db is connected between one end of the auxiliary winding 122 and the auxiliary input port 5, and the other end of the auxiliary winding 122 is connected to the auxiliary input port 6.
The DC-DC auxiliary converter 20 includes an auxiliary power switching tube Q2, an inductor L2 (or transformer T2), and a rectifying diode D7. The auxiliary input ports comprise an auxiliary input port 5 and an auxiliary input port 6. The auxiliary output ports include an auxiliary output port 7 and an auxiliary output port 8. The auxiliary power switch Q2 also has a body diode D Q2.
Referring to fig. 4, the following details of the configuration of the DC-DC auxiliary converter 20 of the buck converter type are given:
The source electrode of the auxiliary power switch tube Q2 is connected with one end of the inductor L2, the drain electrode is connected with the auxiliary input port 5, and the grid electrode is connected with the output end of the second auxiliary comparator U6. The other end of the inductor L2 is connected with the auxiliary output port 7, one end of the rectifier diode D7 is connected between the source electrode of the auxiliary power switch tube Q2 and one end of the inductor L2, and the other end of the rectifier diode D7 is connected between the auxiliary input port 6 and the auxiliary output port 8.
Referring to fig. 7, the following details of the construction of a boost converter type DC-DC auxiliary converter 20 are provided:
One end of the inductor L2 is connected to the auxiliary input port 5, and the other end is connected to one end of the rectifier diode D7. The other end of the rectifying diode D7 is connected to the auxiliary output port 7. The source electrode of the auxiliary power switch tube Q2 is connected between the auxiliary input port 6 and the auxiliary output port 8, the drain electrode is connected between the inductor L2 and the rectifying diode D7, and the grid electrode is connected with the output end of the second auxiliary comparator U6.
Referring to fig. 8, the following details of the structure of the buck-boost converter type DC-DC auxiliary converter 20 are shown:
The source electrode of the auxiliary power switch tube Q2 is connected with the auxiliary output port 8, the drain electrode is connected with the auxiliary input port 5, and the grid electrode is connected with the output end of the second auxiliary comparator U6. A rectifying diode D7 is connected between the auxiliary input port 6 and the auxiliary output port 7. One end of the inductor L2 is connected between the source of the auxiliary power switch tube Q2 and the auxiliary output port 8, and the other end of the inductor L2 is connected between the auxiliary input port 6 and the rectifier diode D7.
Referring to fig. 9, the following details of the constitution of the DC-DC auxiliary converter 20 of the negative-pressure buck converter type are given:
The source electrode of the auxiliary power switch tube Q2 is connected with one end of the inductor L2, the drain electrode is connected with the auxiliary input port 5, and the grid electrode is connected with the output end of the second auxiliary comparator U6. The other end of the inductor L2 is connected to the auxiliary output port 7. One end of the rectifying diode is connected between the auxiliary input port 6 and the auxiliary output port 8, and the other end of the rectifying diode is connected between the source electrode of the auxiliary power switch tube Q2 and one end of the inductor L2.
Referring to fig. 10, the following details of the structure of the flyback-type DC-DC auxiliary converter 20 are shown:
The transformer T2 comprises a first winding and a second winding, wherein one end of the first winding is connected with the auxiliary input port 5, and the other end of the first winding is connected with the drain electrode of the auxiliary power switching tube Q2; the source electrode of the auxiliary power switch tube Q2 is connected with the auxiliary input port 6, and the grid electrode of the auxiliary power switch tube Q2 is connected with the output end of the second auxiliary comparator U6; one end of a second winding of the transformer T2 is connected with a rectifying diode D7, the other end of the rectifying diode D7 is connected with an auxiliary output port 7, and the other end of the second winding is connected with an auxiliary output port 8.
In addition, filter capacitors Co1, cb and Co2 are also arranged in the circuit, wherein the filter capacitor Co1 is connected between the main output ports 3 and 4 and filters the output voltage of the main input ports. The filter capacitor Cb is connected between the auxiliary input ports 5 and 6 and filters the input voltage of the auxiliary input ports. The filter capacitor Co2 is connected between the auxiliary output ports 7 and 8, and filters the output voltage of the auxiliary output ports.
The embodiment of the application also provides LED lighting equipment, which comprises the non-isolated AC-DC constant current driver provided by any one of the optional embodiments of the application.
The foregoing has outlined rather broadly the more detailed description of embodiments of the application in order that the detailed description of the principles and embodiments of the application may be implemented in order that the detailed description of the embodiments may be better understood.

Claims (10)

1. A non-isolated AC-DC constant current driver, comprising: a non-isolated PFC main converter and a DC-DC auxiliary converter;
The non-isolated PFC main converter comprises a main input port, a PFC power conversion unit, a voltage converter and a main output port, wherein the voltage converter comprises a main winding and an auxiliary winding; the DC-DC auxiliary converter comprises an auxiliary input port and an auxiliary output port;
The input end of the PFC power conversion unit is connected with the main input port, and the output end of the PFC power conversion unit is connected with one end of the main winding; the other end of the main winding is connected with the main output port; the auxiliary winding is connected with the auxiliary input port; the auxiliary output port is connected in series with the main output port;
The PFC power conversion unit is used for: converting alternating current input through the main input port into direct current and transmitting the direct current to the voltage converter; the voltage converter is used for: transmitting the received direct current to the main output port through the main winding, and transmitting the received direct current to the DC-DC auxiliary converter through the auxiliary winding and the auxiliary input port; the DC-DC auxiliary converter is used for: and processing the received direct current and transmitting the processed direct current to the auxiliary output port.
2. The non-isolated AC-DC constant current driver of claim 1, further comprising: a PFC controller; the non-isolated PFC main converter further includes: a main power switching tube;
The main power switch tube is connected between the output end of the PFC power conversion unit and one end of the main winding; or the main power switch tube is connected with the other end of the main winding;
the PFC controller comprises a main feedback port, a first main acquisition port, a main control port, a main reference voltage port and a main reference sawtooth wave signal port; the main feedback port is connected with the main output port, the first main acquisition port is connected with the auxiliary winding, and the main control port is connected with the control end of the main power switch tube;
The PFC controller is used for: receiving a main voltage output by the main output port through the main feedback port, receiving the voltage of the auxiliary winding through the first main acquisition port, receiving a main reference voltage through the main reference voltage port, and receiving a main reference sawtooth wave signal through the main reference sawtooth wave signal port; and then, controlling the on and off of the main power switch tube by using the main voltage, the voltage of the auxiliary winding, the main reference voltage and the main reference sawtooth wave signal.
3. The non-isolated AC-DC constant current driver of claim 2, wherein the PFC controller further comprises a second main harvesting port; the second main acquisition port is connected with the main power switch tube;
the PFC controller is further configured to: and receiving the voltage of the main power switch tube through the second main acquisition port.
4. The non-isolated AC-DC constant current driver of claim 3, wherein the non-isolated PFC main converter further comprises: a first main acquisition member and a second main acquisition member; the first main acquisition piece is connected between the second main acquisition port and the main power switch tube, and the second main acquisition piece is connected between the first main acquisition port and the auxiliary winding;
The second main acquisition port acquires the voltage of the main power switch tube through the first main acquisition piece, and the first main acquisition port acquires the voltage of the auxiliary winding through the second main acquisition piece.
5. The non-isolated AC-DC constant current driver of claim 3, wherein the PFC controller comprises a main reference voltage source, a main reference sawtooth signal source, a first main comparator, a second main comparator, a third main comparator, and a trigger; the trigger is provided with an S port, a Q port and an R port;
The negative input end of the first main comparator is connected with the main feedback port, the positive input end of the first main comparator is connected with the main reference voltage source through the main reference voltage port, and the output end of the first main comparator is connected with the positive input end of the second main comparator; the negative input end of the second main comparator is connected with the second main acquisition port, and the output end of the second main comparator is connected with the positive input end of the third main comparator; the negative input end of the third main comparator is connected with the main reference sawtooth wave signal source through the main reference sawtooth wave signal port, and the output end of the third main comparator is connected with the R port; the Q port is connected with the main control port, and the S port is connected with the first main acquisition port.
6. The non-isolated AC-DC constant current driver of claim 1, further comprising: a DC-DC controller; the DC-DC auxiliary converter further includes: an auxiliary power switching tube;
The DC-DC controller comprises an auxiliary feedback port, an auxiliary control port, an auxiliary reference current port and an auxiliary reference sawtooth wave signal port; the auxiliary feedback port is connected with the auxiliary output port, and the auxiliary control port is connected with the control end of the auxiliary power switch tube;
The DC-DC controller is used for: receiving current provided by the auxiliary output port and the main output port after being connected in series through the auxiliary feedback port, receiving auxiliary reference current through the auxiliary reference current port, and receiving auxiliary reference sawtooth wave signals through the auxiliary reference sawtooth wave signal port; and then, controlling the on and off of the auxiliary power switch tube by utilizing the current provided by the auxiliary output port and the main output port after being connected in series, the auxiliary reference current and the auxiliary reference sawtooth wave signal.
7. The non-isolated AC-DC constant current driver of claim 6, wherein the DC-DC auxiliary converter further comprises: an auxiliary acquisition piece;
the auxiliary output port is used for collecting current provided by the auxiliary output port and the main output port after being connected in series through the auxiliary collecting piece.
8. The non-isolated AC-DC constant current driver of claim 6, wherein the DC-DC controller comprises: the first auxiliary comparator, the second auxiliary comparator, the auxiliary reference current source and the auxiliary reference sawtooth wave signal source;
The negative input end of the first auxiliary comparator is connected with the auxiliary feedback port, the positive input end of the first auxiliary comparator is connected with the auxiliary reference current source through the auxiliary reference current port, and the output end of the first auxiliary comparator is connected with the positive input end of the second auxiliary comparator; the negative input end of the second auxiliary comparator is connected with the auxiliary reference sawtooth wave signal source through the auxiliary reference sawtooth wave signal port, and the output end of the second auxiliary comparator is connected with the auxiliary control port.
9. The non-isolated AC-DC constant current driver according to any one of claims 1 to 8, wherein the non-isolated PFC main converter comprises one of a buck converter, a boost converter, a buck-boost converter, a hill-gram converter, a single-ended primary inductive converter, and a zero-voltage switching converter; the DC-DC auxiliary converter comprises one of a buck converter, a boost converter, a buck-boost converter, a flyback converter, a forward converter, a Cuck converter, a single-ended primary inductive converter and a zero-voltage switching converter.
10. An LED lighting device comprising the non-isolated AC-DC constant current driver of any one of claims 1 to 9.
CN202110114151.XA 2021-01-27 2021-01-27 Non-isolated AC-DC constant current driver and LED lighting equipment Active CN112788814B (en)

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