CN112770450B - Wide voltage isolation type AC-DC constant current driver and LED lighting equipment - Google Patents

Wide voltage isolation type AC-DC constant current driver and LED lighting equipment Download PDF

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CN112770450B
CN112770450B CN202110114148.8A CN202110114148A CN112770450B CN 112770450 B CN112770450 B CN 112770450B CN 202110114148 A CN202110114148 A CN 202110114148A CN 112770450 B CN112770450 B CN 112770450B
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auxiliary
main
port
voltage
converter
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CN112770450A (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
    • 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
    • H05B45/37—Converter circuits

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Abstract

The application discloses a wide-voltage isolation type AC-DC constant current driver and LED lighting equipment, wherein the wide-voltage isolation type AC-DC constant current driver comprises an isolation PFC main converter, a PFC controller, a DC-DC auxiliary converter and a DC-DC controller; the isolated PFC main converter comprises a PFC power conversion unit, a voltage converter and a main output port, wherein the voltage converter comprises a first main winding, a first auxiliary winding, a second main winding and a second auxiliary winding, and the DC-DC auxiliary converter comprises an auxiliary input port and an auxiliary output port; the PFC controller comprises a main feedback port and a main control port; the DC-DC controller comprises an auxiliary feedback port and an auxiliary control port; the main output port and the auxiliary output port are connected in series to form a total output port. The auxiliary voltage is controlled to be a fixed value in a closed loop mode, the total current is kept constant, and then the main voltage can be adjusted to enable the total voltage range to be wider.

Description

Wide voltage isolation type AC-DC constant current driver and LED lighting equipment
Technical Field
The application relates to the technical field of circuits, in particular to a wide-voltage isolation type 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 normal operation of the LED lighting device requires a driving power source, and the driving power source is generally a constant current driver. Current constant current drivers include both single stage and multi-stage. The single-stage constant current driver has simple structure and lower cost, but has narrower output voltage. Therefore, in the industry, a multi-stage constant current driver is generally selected, wherein two stages of constant current drivers are common, and the two stages of constant current drivers have wider output voltage, but have excessive components, serious heating phenomenon and high cost, so that the resources are not saved.
Disclosure of Invention
The application aims to provide a wide-voltage isolation type AC-DC constant current driver and LED lighting equipment, which have a wider output voltage range, fewer components are used, the heating phenomenon is relieved, the cost is lower, and the resource is saved.
The first aspect of the present application provides a wide voltage isolation type AC-DC constant current driver, comprising: isolating the PFC main converter, the PFC controller, the DC-DC auxiliary converter and the DC-DC controller; the isolating PFC main converter comprises a PFC power conversion unit, a voltage converter and a main output port, wherein the voltage converter comprises a first main winding, a first auxiliary winding, a second main winding and a second auxiliary winding, the first main winding and the first auxiliary winding are mutually inductive, and the second main winding and the second auxiliary winding are mutually inductive; the PFC power conversion unit, the first main winding and the first auxiliary winding form a main output module, and the PFC power conversion unit, the second main winding and the second auxiliary winding form an auxiliary output module; the DC-DC auxiliary converter comprises an auxiliary input port and an auxiliary output port; the PFC controller comprises a main feedback port and a main control port; the DC-DC controller comprises an auxiliary feedback port and an auxiliary control port; the main output port and the auxiliary output port are connected in series to form a total output port; the main output module is connected with the main output port, the auxiliary output module is connected with the auxiliary input port, the main feedback port is connected with the auxiliary output port, and the auxiliary feedback port is connected with the main output port; the main control port is connected with the isolating PFC main converter, and the auxiliary control port is connected with the DC-DC auxiliary converter; the main voltage output by the main output module is transmitted to a main output port and a total output port; the auxiliary voltage output by the auxiliary output module is transmitted to an auxiliary input port and a total output port; after receiving the auxiliary voltage from the auxiliary input port, the DC-DC controller processes the auxiliary voltage and transmits the processed auxiliary voltage to the main feedback port through the auxiliary output port; after receiving the auxiliary voltage from the main feedback port, the PFC controller controls and isolates the PFC main converter by using the auxiliary voltage; the total output port receives the main voltage and the auxiliary voltage and outputs total voltage and total current; the total current is transmitted to the auxiliary feedback port; and after receiving the total current from the auxiliary feedback port, the DC-DC controller controls the DC-DC auxiliary converter by using the total current.
In one embodiment, an output of the PFC power conversion unit is connected to the first main winding; the first auxiliary winding is connected with the main output port; the second auxiliary winding is connected with the auxiliary input port; after the PFC power conversion unit receives the alternating current, the alternating current is converted, so that the main output port outputs main voltage, and the auxiliary output port outputs auxiliary voltage.
In one embodiment, the isolated PFC main converter further comprises: a main power switching tube; the main power switching tube is connected with the second main winding; the PFC controller also comprises a first main acquisition port, a main reference voltage port and a main reference sawtooth wave signal port; the first main acquisition port is connected with the second main winding, and the main control port is connected with the control end of the main power switch tube; the PFC controller also receives a voltage from the second main winding of the first main acquisition port, a main reference voltage from the main reference voltage port, and a main reference sawtooth signal from the main reference sawtooth signal port; isolating the PFC main converter with auxiliary voltage control includes: comparing the auxiliary voltage with the main reference voltage to form a voltage error signal; comparing the voltage error signal with the main reference sawtooth wave signal to form a stop pulse signal; forming a start pulse signal based on the voltage of the second main winding; and controlling the on and off of the main power switch tube by using the stop pulse signal and the start pulse signal.
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 also receives the voltage of the main power switch tube from the second main acquisition port; comparing the voltage error signal with the main reference sawtooth signal to form a stop pulse signal includes: comparing the voltage error signal with the voltage of the main power switch tube to form a comparison result, and comparing the main reference sawtooth wave signal with the comparison result to form a stop pulse signal.
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; the first master comparator is for: comparing the auxiliary voltage with the main reference voltage to form a voltage error signal; the second master comparator is used for: comparing the voltage error signal with the voltage of the main power switching tube to form a comparison result; the third master comparator is used for: comparing the main reference sawtooth wave signal with the comparison result to form a stop pulse signal; the trigger is used for: forming a start pulse signal based on the voltage of the second main winding; and controlling the on and off of the main power switch tube by using the stop pulse signal and the start pulse signal.
In one embodiment, the DC-DC auxiliary converter further comprises: an auxiliary power switching tube; the DC-DC controller also comprises an auxiliary reference current port and an auxiliary reference sawtooth wave signal port; the auxiliary control port is connected with the control end of the auxiliary power switch tube; the DC-DC controller also receives an auxiliary reference current from the auxiliary reference current port and an auxiliary reference sawtooth signal from the auxiliary reference sawtooth signal port; controlling the DC-DC auxiliary converter with the total current includes: comparing the total current with the auxiliary reference current to form a voltage error signal; and comparing the voltage error signal with the auxiliary reference sawtooth wave signal to form a control signal, and transmitting the control signal to the control end of the auxiliary power switch tube.
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 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 an 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 an auxiliary control port; the first auxiliary comparator is used for: comparing the total current with the auxiliary reference current to form a voltage error signal; comparing the voltage error signal with the auxiliary reference sawtooth wave signal to form a control signal; the second auxiliary comparator is used for: and comparing the voltage error signal with the auxiliary reference sawtooth wave signal to form a control signal, and outputting the control signal to the control end of the auxiliary power switch tube.
In one embodiment, the isolated PFC main converter includes a flyback converter or a forward converter.
In one embodiment, the DC-DC auxiliary converter includes one of a buck converter, a boost converter, a buck-boost converter, a flyback converter, a forward converter, a cuckoo 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 the wide voltage isolation AC-DC constant current driver of any of the first aspects of the application.
According to the wide-voltage isolation type AC-DC constant current driver provided by the application, the auxiliary voltage output by the auxiliary output module is fed back to the PFC controller, and the PFC controller controls and isolates the PFC main converter based on the fed-back auxiliary voltage, so that the closed-loop control of the auxiliary voltage is realized. Wherein the total current of the port of the total output is fed back to the DC-DC controller, which controls the DC-DC converter based on the fed back total current, whereby a closed-loop control of the total current is achieved. In summary, the auxiliary voltage is controlled to be a constant value through the PFC controller in a closed loop manner, and the total current is controlled to be a constant value through the DC-DC controller in a constant current manner, so that the PFC controller can indirectly adjust the main voltage under the condition of maintaining the total current constant, thereby making the range of the total voltage wider. And because the main voltage is single-stage conversion, only two-stage conversion is needed for the auxiliary voltage, so that the number of required components and parts is reduced, the heating degree is reduced, the cost is reduced, and the resources are saved.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained by those skilled in the art without the inventive effort.
FIG. 1 is a schematic diagram of a wide voltage isolation type AC-DC constant current driver provided by an embodiment of the present application;
FIG. 2 is a schematic diagram of a wide voltage isolation type AC-DC constant current driver according to another embodiment of the present application;
FIG. 3 is a schematic diagram of a wide voltage isolation type AC-DC constant current driver according to another embodiment of the present application;
FIG. 4 is a schematic diagram of a wide voltage isolation type AC-DC constant current driver according to another embodiment of the present application;
FIG. 5 is a schematic diagram of a DC-DC auxiliary converter provided by an alternative embodiment of the application;
FIG. 6 is a schematic diagram of a DC-DC auxiliary converter provided by an alternative embodiment of the 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.
Reference numerals illustrate:
The isolated PFC main converter 10, PFC power conversion unit 11, voltage converter 110, first main winding 121, first auxiliary winding 122, second main winding 123, second auxiliary winding 124, 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 8, a wide voltage isolation type AC-DC constant current driver according to an embodiment of the present application includes an isolation PFC main converter 10, a PFC controller 30, a direct current-direct current (direct current to direct current, DC-DC) auxiliary converter, and a DC-DC controller 40.
The isolated PFC main converter 10 includes a PFC power conversion unit 11, a voltage converter 110, and a main output port, the voltage converter 110 includes a first main winding 121, a first auxiliary winding 122, a second main winding 123, and a second auxiliary winding 124, the first main winding 121 and the first auxiliary winding 122 are mutually-inductive, and the second main winding 123 and the second auxiliary winding 124 are mutually-inductive; the PFC power conversion unit 11, the first main winding 121 and the first auxiliary winding 122 form a main output module, and the PFC power conversion unit 11, the second main winding 123 and the second auxiliary winding 124 form an auxiliary output module.
The DC-DC auxiliary converter 20 includes an auxiliary input port and an auxiliary output port; the PFC controller 30 includes a main feedback port a1 and a main control port a3; the DC-DC controller 40 includes an auxiliary feedback port b1 and an auxiliary control port b2; the main output port and the auxiliary output port are connected in series to form a total output port.
Specifically, the main output module is connected with the main output port, the auxiliary output module is connected with the auxiliary input port, the main feedback port a1 is connected with the auxiliary output port, and the auxiliary feedback port b1 is connected with the total output port. The main control port a3 is connected to the isolated PFC main converter 10, and the auxiliary control port b2 is connected to the DC-DC auxiliary converter 20.
The main voltage Vo1 output by the main output module is transmitted to a main output port and a total output port; the auxiliary voltage Vo2 output by the auxiliary output module is transmitted to an auxiliary input port and a total output port; after receiving the auxiliary voltage Vo2 from the auxiliary input port, the DC-DC controller 40 processes the auxiliary voltage Vo2 and transmits the processed auxiliary voltage Vo2 to the main feedback port a1 through the auxiliary output port; after receiving the auxiliary voltage Vo2 from the main feedback port a1, the PFC controller 30 controls the isolated PFC main converter 10 using the auxiliary voltage Vo 2.
The total output port receives the main voltage Vo1 and the auxiliary voltage Vo2 and then outputs total voltage and total current Ios; the total current Ios is transmitted to the auxiliary feedback port b1; after receiving the total current Ios from the auxiliary feedback port b1, the DC-DC controller 40 controls the DC-DC auxiliary converter 20 by using the total current Ios.
The wide-voltage isolation type AC-DC constant current driver forms an isolation type structure by utilizing four windings, wherein the auxiliary voltage Vo2 output by the auxiliary output module is fed back to the PFC controller 30, and the PFC controller 30 controls the isolation PFC main converter 10 based on the fed-back auxiliary voltage Vo2, so that the closed-loop control of the auxiliary voltage Vo2 is realized. Wherein the total current Ios of the total output port is fed back to the DC-DC controller 40, and the DC-DC controller 40 controls the DC-DC converter based on the fed-back total current Ios, thereby realizing closed-loop control of the total current Ios.
In summary, the auxiliary voltage Vo2 is controlled to a constant value by the PFC controller 30 in a closed loop manner, and the total current Ios is also controlled to a constant value by the DC-DC controller 40 in a constant current manner, so that the PFC controller 30 can indirectly adjust the main voltage Vo1 under the condition of maintaining the total current Ios constant, thereby making the total voltage range wider. And because the main voltage Vo1 is single-stage conversion, only two-stage conversion is needed for the auxiliary voltage Vo2, so that the number of required components and parts is reduced, the heating degree is reduced, the cost is reduced, and the resources are saved.
In addition, 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 a part of the power to the load 60 through two-stage conversion, so that only a part of the power is converted through two stages as a whole, and the power consumption can be reduced by the way of the two-stage conversion compared with the way of the two-stage conversion of all the output power.
It will be appreciated by those skilled in the art that the isolated PFC main converter 10 also has a main input port. When the wide-voltage isolation type AC-DC constant current driver provided in the above embodiment is applied, a main input port of the wide-voltage isolation type AC-DC constant current driver is connected with an AC power supply 50, and a total output port formed by connecting a main output port and an auxiliary output port in series is connected with a load 60. Of course, the load 60 may be any device that needs power, and in the embodiment of the present application, an LED string light 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.
In one embodiment, the output of PFC power conversion unit 11 is connected to first main winding 121; the first auxiliary winding 122 is connected to the main output port; the second auxiliary winding 124 is connected to the auxiliary input port.
The voltage converter 110 may be a transformer or an inductor T1 having four windings.
Specifically, after the ac power supply 50 and the LED string light are connected, the current provided by the ac power supply 50 is directly output to the LED string light in the form of a main voltage Vo1 from the main output port after passing through the PFC power conversion unit 11, the first main winding 121 and the first auxiliary winding 122; and the current supplied from the ac power supply 50 is converted into a voltage by the PFC power conversion unit 11, the second main winding 123 and the second auxiliary winding 124, 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.
In an alternative embodiment, where the resistances of the first main winding 121 and the second main winding 123 are equal, the resistance of the first auxiliary winding 122 is smaller than the resistance of the second auxiliary winding 124, so that the main voltage Vo1 is greater than the auxiliary voltage Vo2 and the output power of the main output port is greater than the output power of the auxiliary output port with the same current. That is, the PFC power conversion unit 11 provides part of the output power to the LED string, and is only a single stage power conversion. The DC-DC auxiliary converter 20 provides a part of output power to the light string, and although the power provided by the DC-DC auxiliary converter 20 is subjected to two-stage conversion, only a part of the power is occupied, so that compared with the two-stage conversion of all output power, the power consumption is obviously reduced in the mode, and the overall conversion efficiency is improved.
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.
Specifically, assuming that the conversion efficiency of the 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 isolated PFC main converter 10 output power, the DC-DC auxiliary converter 20 output power, and the overall output power, respectively, the overall efficiency is:
Let P DC-DC＝％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 power loss of the wide-voltage isolation type AC-DC constant current driver provided by the embodiment of the application is lower, and the overall efficiency can be improved.
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.
In one embodiment, referring to fig. 2 and 3, the isolated PFC main converter 10 further includes a main power switching tube Q1; the main power switching tube Q1 is connected to the second main winding 123. The PFC controller 30 further includes a first main acquisition port a2, a main reference voltage port a5, and a main reference sawtooth signal port a4; the first main acquisition port a2 is connected with the second main winding 123, and the main control port a3 is connected with the control end of the main power switch tube Q1. The PFC controller 30 also receives the voltage from the second main winding 123 of the first main acquisition port a2, the main reference voltage from the main reference voltage port a5, and the main reference sawtooth signal from the main reference sawtooth signal port a 4.
The control of the isolated PFC main converter 10 with the auxiliary voltage Vo2 may be specifically; the isolated PFC main converter 10 is controlled with the auxiliary voltage Vo2, the voltage of the second main winding 123, the main reference voltage, and the main reference sawtooth signal. The detailed process is as follows:
Comparing the auxiliary voltage Vo2 with the main reference voltage to form a voltage error signal; comparing the voltage error signal with the main reference sawtooth wave signal to form a stop pulse signal; forming a start pulse signal based on the voltage of the second main winding 123; and controlling the on and off of the main power switch tube Q1 by using the stop pulse signal and the start pulse signal.
The stop pulse signal and the start pulse signal may form a pulse width modulation (pulse width modulation, PWM) signal that is used to control the main power switch Q1.
That is, the auxiliary voltage Vo2 of the auxiliary 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 a5, and the PFC controller 30 compares the auxiliary voltage Vo2 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 second main winding 123 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 second main winding 123; the PFC controller 30 then uses the start pulse signal to control the turn-on of the main power switching transistor Q1.
The control mode can control the auxiliary voltage Vo2 in a closed loop manner, and can realize that the input current and the output voltage are sine waves with the same frequency and the same phase so as to achieve power factor correction and better power factor, thereby realizing zero pollution to a power grid.
In one embodiment, PFC controller 30 further includes a second primary acquisition port a6; the second main acquisition port a6 is connected with the main power switch tube Q1. The PFC controller 30 also receives the voltage of the main power switch Q1 from the second main acquisition port a 6. Comparing the voltage error signal with the main reference sawtooth signal to form a stop pulse signal includes: the voltage error signal is compared with the voltage of the main power switch tube Q1 to form a comparison result, and the main reference sawtooth wave signal is compared with the comparison result to form a stop pulse signal.
That is, 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 isolated PFC main converter 10 further includes a first main harvester and a second main harvester; the second main acquisition element is connected with the main power switch tube Q1, and the first main acquisition element is connected between the first main acquisition port a2 and the second main winding 123. The second main acquisition port a6 acquires the voltage of the main power switching tube Q1 through the second main acquisition piece, and the first main acquisition port a2 acquires the voltage of the second main winding 123 through the first main acquisition piece. Alternatively, the first main collecting element and the second main collecting element may be a resistor Rdem and a resistor Ri, respectively.
The first main acquisition part and the second main acquisition part are arranged, so that PFC control can accurately acquire required signals, and accuracy of the PFC control main power switch tube Q1 is improved.
In one embodiment, PFC controller 30 includes a main reference voltage source, a main reference sawtooth signal source, 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.
Specifically, 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 a main reference voltage source through the main reference voltage port a5, 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 through a main reference sawtooth wave signal port a4, 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.
The first master comparator U1 is for: comparing the auxiliary voltage Vo2 with the main reference voltage to form a voltage error signal; the second master comparator U2 is for: comparing the voltage error signal with the voltage of the main power switching tube Q1 to form a comparison result; the third master comparator U3 is for: comparing the main reference sawtooth wave signal with the comparison result to form a stop pulse signal; the trigger U4 is configured to: forming a start pulse signal based on the voltage of the second main winding 123; and controlling the on and off of the main power switch tube Q1 by using the stop pulse signal and the start pulse signal.
In detail, after the first comparator receives the auxiliary voltage Vo2 and the main reference voltage of the main output port, the auxiliary voltage Vo2 and the main reference voltage of the main output port are compared, and then a voltage error signal is output to the second comparator. After receiving the voltage error signal and the voltage of the main power switching tube Q1, the second comparator controls the peak current of the main power switching tube Q1, compares the voltage error signal and the voltage of the main power switching tube Q1, and outputs a comparison result to the third comparator. After receiving the comparison result and the main reference sawtooth wave signal, the third comparator compares the comparison result with the main reference sawtooth wave signal and outputs a signal to the R end of the contactor; the contactor generates a stop pulse signal according to the signal, and outputs the stop pulse signal to the control end of the main power switching tube Q1 through the Q end of the contactor so as to control the turn-off of the main power switching tube Q1. After the contactor receives the voltage of the second main winding 123 through the S-terminal, a start pulse signal is generated by using the voltage of the second main winding 123; 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 accurate control of the isolated PFC main converter 10, and has simple manufacture, low cost and high control accuracy.
In one embodiment, the DC-DC auxiliary converter 20 further includes an auxiliary power switching tube Q2; the DC-DC controller 40 further includes an auxiliary reference current port b3 and an auxiliary reference sawtooth signal port b4; the auxiliary control port b2 is connected with the control end of the auxiliary power switch tube Q2. The DC-DC controller 40 also receives the auxiliary reference current from the auxiliary reference current port b3 and the auxiliary reference sawtooth signal from the auxiliary reference sawtooth signal port b 4.
The control of the DC-DC auxiliary converter 20 using the total current Ios includes: comparing the total current Ios with the auxiliary reference current to form a voltage error signal; and comparing the voltage error signal with the auxiliary reference sawtooth wave signal to form a control signal, and transmitting the control signal to the control end of the auxiliary power switch tube Q2.
The control strategy can realize the closed-loop control of the current of the LED lamp string on the one hand. In addition, the control strategy of the PFC controller 30 and the control strategy of the DC-DC controller 40 are combined, so that the ripple waves of the main voltage Vo1 of the main output port and the ripple waves of the auxiliary voltage Vo2 of the auxiliary output port are reversely overlapped and offset, and the ripple wave of the total output voltage Vo is reduced, so that the ripple wave of the current of the LED light string is reduced.
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 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 fast loop controlled and the isolated PFC main converter 10 is slow loop controlled. 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 one embodiment, referring to fig. 4, the DC-DC auxiliary converter 20 further includes an auxiliary collector; the auxiliary acquisition piece is connected between the auxiliary output port and the auxiliary feedback port b1. The auxiliary output port is used for collecting the voltage provided by the auxiliary output port and the main output port after being connected in series through the auxiliary collecting piece. Alternatively, the auxiliary collecting element may be a resistor R3. 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 one embodiment, the DC-DC controller 40 includes: the first auxiliary comparator U5, the second auxiliary comparator U6, an auxiliary reference current source and an auxiliary reference sawtooth signal source.
Specifically, 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 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 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.
The first auxiliary comparator U5 is configured to: comparing the total current Ios with the auxiliary reference current to form a voltage error signal; the voltage error signal and the auxiliary reference sawtooth signal are compared to form a control signal. The second auxiliary comparator U6 is configured to: and comparing the voltage error signal with the auxiliary reference sawtooth wave signal to form a control signal, and outputting the control signal to the control end of the auxiliary power switch tube.
Specifically, the first auxiliary comparator U5 receives the auxiliary reference current from the auxiliary reference current port b3, and compares the total current Ios with the auxiliary reference current to form a voltage error signal after receiving the total current Ios from the auxiliary feedback port b1, and outputs the voltage error signal 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 and the auxiliary reference sawtooth wave signal to generate a control signal of the auxiliary power switching tube Q2, and then outputs the control signal to a control end of the auxiliary power switching tube Q2 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.
The PFC controller 30 with the above structure can realize accurate control of the isolated PFC main converter 10, and has simple manufacture, low cost and high control accuracy.
In an alternative embodiment, the isolated PFC main converter 10 includes a flyback converter or a forward 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 isolated PFC main converter 10 includes a PFC power conversion unit 11, a rectifier diode D5, a rectifier diode Db, a voltage converter 110, and a main power switching tube Q1. The several cells may constitute an isolated PFC main converter 10 of the buck, boost and buck-boost converter type. 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 structure of the flyback converter type isolated PFC main converter 10 are provided: the first main winding 121, the main power switching tube Q1 and the resistor Ri are connected in series and then connected in parallel with the filter capacitor Cin. The drain electrode of the main power switch tube Q1 is connected with the first main winding 121, the source electrode of the main power switch tube Q1 is connected with the resistor Ri, and the grid electrode of the main power switch tube Q1 is connected with the Q end of the trigger U4 through the second main acquisition port a 6. A rectifying diode D5 is connected between the first auxiliary winding 122 and the main output port. The second main winding 123 is connected to the first main acquisition port through a resistor Rdem; the rectifier diode Db is connected between the second auxiliary winding 124 and the auxiliary input port 5.
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. 5, 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. 6, 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. 7, the following details of the construction 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. 8, 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 input 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 wide-voltage isolation type AC-DC constant current driver provided by any one of the optional embodiments of the application.
The foregoing has outlined rather closely the embodiments of the present application, and specific examples have been presented herein to illustrate the principles and embodiments of the present application.

Claims (10)

1. A wide voltage isolation type AC-DC constant current driver, comprising: isolating the PFC main converter, the PFC controller, the DC-DC auxiliary converter and the DC-DC controller;
The isolating PFC main converter comprises a PFC power conversion unit, a voltage converter and a main output port, wherein the voltage converter comprises a first main winding, a first auxiliary winding, a second main winding and a second auxiliary winding, the first main winding and the first auxiliary winding are mutually inductive, and the second main winding and the second auxiliary winding are mutually inductive; the PFC power conversion unit, the first main winding and the first auxiliary winding form a main output module, and the PFC power conversion unit, the second main winding and the second auxiliary winding form an auxiliary output module;
The DC-DC auxiliary converter comprises an auxiliary input port and an auxiliary output port; the PFC controller comprises a main feedback port and a main control port; the DC-DC controller comprises an auxiliary feedback port and an auxiliary control port; the main output port and the auxiliary output port are connected in series to form a total output port;
The main output module is connected with the main output port, the auxiliary output module is connected with the auxiliary input port, the main feedback port is connected with the auxiliary output port, and the auxiliary feedback port is connected with the total output port; the main control port is connected with the isolating PFC main converter, and the auxiliary control port is connected with the DC-DC auxiliary converter;
the main voltage output by the main output module is transmitted to the main output port and the total output port; the auxiliary voltage output by the auxiliary output module is transmitted to the auxiliary input port and the total output port; after receiving the auxiliary voltage from the auxiliary input port, the DC-DC controller processes the auxiliary voltage and transmits the processed auxiliary voltage to the main feedback port through the auxiliary output port; after the PFC controller receives the auxiliary voltage from the main feedback port, the auxiliary voltage is utilized to control the isolating PFC main converter;
The total output port receives the main voltage and the auxiliary voltage and then outputs total voltage and total current; the total current is transmitted to the secondary feedback port; and after the DC-DC controller receives the total current from the auxiliary feedback port, the DC-DC auxiliary converter is controlled by using the total current.
2. The wide voltage isolation AC-DC constant current driver of claim 1, wherein an output of the PFC power conversion unit is connected to the first main winding; the first auxiliary winding is connected with the main output port; the second auxiliary winding is connected with the auxiliary input port; after receiving the alternating current, the PFC power conversion unit converts the alternating current so that the main output port outputs the main voltage, and the auxiliary output port outputs the auxiliary voltage.
3. The wide voltage isolation AC-DC constant current driver of claim 2, wherein the isolated PFC main converter further comprises: a main power switching tube; the main power switch tube is connected with the second main winding;
the PFC controller also comprises a first main acquisition port, a main reference voltage port and a main reference sawtooth wave signal port; the first main acquisition port is connected with the second main winding, and the main control port is connected with the control end of the main power switch tube;
The PFC controller also receives a voltage of the second main winding from the first main acquisition port, a main reference voltage from the main reference voltage port, and a main reference sawtooth signal from the main reference sawtooth signal port;
The controlling the isolated PFC main converter with the auxiliary voltage includes: comparing the auxiliary voltage with the main reference voltage to form a voltage error signal; comparing the voltage error signal with the main reference sawtooth wave signal to form a stop pulse signal; forming a start pulse signal based on the voltage of the second main winding; and controlling the on and off of the main power switch tube by using the stop pulse signal and the start pulse signal.
4. The wide voltage isolation AC-DC constant current driver of claim 3 wherein said 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 also receives a voltage of the main power switch tube from the second main acquisition port;
said comparing said voltage error signal with said primary reference sawtooth signal to form a stop pulse signal includes: comparing the voltage error signal with the voltage of the main power switching tube to form a comparison result, and comparing the main reference sawtooth wave signal with the comparison result to form a stop pulse signal.
5. The wide voltage isolation AC-DC constant current driver of claim 4 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;
The first master comparator is to: comparing the auxiliary voltage with the main reference voltage to form a voltage error signal; the second master comparator is for: comparing the voltage error signal with the voltage of the main power switching tube to form a comparison result; the third master comparator is for: comparing the main reference sawtooth wave signal with the comparison result to form a stop pulse signal; the trigger is used for: forming a start pulse signal based on the voltage of the second main winding; and controlling the on and off of the main power switch tube by using the stop pulse signal and the start pulse signal.
6. The wide voltage isolation AC-DC constant current driver of claim 1, wherein the DC-DC auxiliary converter further comprises: an auxiliary power switching tube; the DC-DC controller also comprises an auxiliary reference current port and an auxiliary reference sawtooth wave signal port; the auxiliary control port is connected with the control end of the auxiliary power switch tube;
The DC-DC controller also receives an auxiliary reference current from the auxiliary reference current port and an auxiliary reference sawtooth signal from the auxiliary reference sawtooth signal port;
the controlling the DC-DC auxiliary converter using the total current includes:
Comparing the total current with the auxiliary reference current to form a voltage error signal; and comparing the voltage error signal with the auxiliary reference sawtooth wave signal to form a control signal, and transmitting the control signal to the control end of the auxiliary power switch tube.
7. The wide voltage isolation 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;
the first auxiliary comparator is used for: comparing the total current with the auxiliary reference current to form a voltage error signal; comparing the voltage error signal with the auxiliary reference sawtooth wave signal to form a control signal;
The second auxiliary comparator is used for: and comparing the voltage error signal with the auxiliary reference sawtooth wave signal to form a control signal, and outputting the control signal to the control end of the auxiliary power switch tube.
8. The wide voltage isolation AC-DC constant current driver of any of claims 1 to 7, wherein the isolated PFC main converter comprises a flyback converter or a forward converter.
9. The wide voltage isolation AC-DC constant current driver according to any of claims 1 to 7, wherein 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 hill-k converter, a single-ended primary inductive converter, and a zero-voltage switching converter.
10. An LED lighting device comprising the wide voltage isolation AC-DC constant current driver of any one of claims 1 to 9.
CN202110114148.8A 2021-01-27 2021-01-27 Wide voltage isolation type AC-DC constant current driver and LED lighting equipment Active CN112770450B (en)

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KR20190085691A (en) * 2018-01-11 2019-07-19 주식회사큐룩스 A Converter Circuit for LED Lamps
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