CN106061037A - LED driving circuit with power factor correction and driver - Google Patents
LED driving circuit with power factor correction and driver Download PDFInfo
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- CN106061037A CN106061037A CN201610574899.7A CN201610574899A CN106061037A CN 106061037 A CN106061037 A CN 106061037A CN 201610574899 A CN201610574899 A CN 201610574899A CN 106061037 A CN106061037 A CN 106061037A
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- 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
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Abstract
The invention provides an LED driving circuit with power factor correction and a driver. The LED driving circuit with power factor correction comprises a first sub circuit, a second sub circuit and a third sub circuit, wherein the first sub circuit provides power for an LED array, and comprises a diode, an inductor, a switching transistor and a current induced resistor; the second sub circuit controls on and off of the switching transistor and comprises a comparator, a logic control unit and a driver; and the third sub circuit comprises a divider and a peak detector, the peak detector detects the peak voltage of an input power supply, the divider removes the peak voltage of the input power supply to generate reference voltage, current of the current induced resistor is determined by the comparator through the reference voltage, and thus current does not change along with the peak voltage of the input power supply. The LED driving circuit solves the problem that constant current driving in a full voltage range can not be realized in the prior art, average current flowing through the LED under different input voltages can be constant, that is, the average current flowing through the LED is constant when the peak voltage of the input power supply changes is constant.
Description
Technical Field
The embodiment of the invention relates to an LED drive circuit, in particular to an LED drive circuit with power factor correction and a driver.
Background
A Light Emitting Diode (LED) is a high-efficiency lamp, and has been widely used in various fields such as indication, display, decoration, backlight, general lighting, and night scene in cities. Generally, a Power Factor Correction (PFC) function is required for an LED lamp, especially for a high-Power LED driver, so as to improve the utilization efficiency of electric energy, increase the capacity of a Power system, and stabilize current.
Generally, LED lamps require a power factor correction function, especially a high-power LED driving circuit, to improve the utilization efficiency of electric energy, increase the capacity of the power system, and stabilize the current. Fig. 1 provides a conventional LED driving circuit with power factor correction, which uses a Buck circuit, as shown in fig. 1, including a diode, an inductor, a current sensing resistor, a switching tube, and a control sub-circuit, where the diode, the inductor, the current sensing resistor, the switching tube, and the control sub-circuit are connected as shown in the figure. The control sub-circuit consists of a comparator, a clock, a reset set trigger (RS trigger) and a switching tube driver. When a power supply is applied to the input end and the grounding point, current flows from the voltage input end to the grounding point through the LED array, the inductor, the switching tube and the current sensing resistor to form a voltage outer ring, and in the action period of the voltage outer ring, when the current flows through the current sensing resistor, the voltage Vcs at two ends of the current sensing resistor gradually rises due to the existence of the inductor, and the Vcs is applied to one end of the comparator. The input signal at the other end of the comparator is a reference voltage, which is formed by dividing the voltage at the input end through a first resistor and a second resistor of a divider resistor, and the waveform of the reference voltage is the same as the sine wave waveform of the input voltage. If VCSWhen the voltage is greater than the reference voltage, the working state is changed, the switch tube is closed, and therefore a current hysteresis loop action period is entered, and due to energy storage of the inductor, current flows from the inductor to the LED array through the diode to form a current hysteresis loop, and the current is reduced at the moment.When the current drops to a certain preset value, the clock circuit provides timed periodic pulses to conduct the switching tube through the RS trigger and the switching tube driving circuit, the switching tube returns to the voltage outer ring action period, the current continues to increase, and the inductor stores energy again. Therefore, the current flowing through the LED array is modulated by the input voltage waveform, so that the envelope of the current flowing through the LED array varies with the waveform of the input voltage, and has a high power factor value (PF).
In the LED driving circuit with PFC function as described above, the average current flowing through the LED varies with the input voltage VIN, i.e. within the full voltage range (85V to 265V ac), the average current flowing through the LED is not constant, and the LED cannot normally emit light due to the variation of the average current because the LED brightness is related to the average current passing through, for example, when the voltage in the power supply grid is unstable or the power supply grid is changed (e.g. the 220V grid environment in china is changed to the 110V grid environment in japan), the LED cannot normally emit light. Specifically, LEDs cannot achieve ideal luminous intensity when the average current is reduced; when the average current rises, damage is caused to the LED, affecting the service life.
Disclosure of Invention
The invention provides an LED drive circuit with power factor correction and a driver, solves the problem that constant current drive in a full voltage range cannot be realized in the prior art, and can realize that the average current flowing through an LED is constant under different input voltages, namely the average current flowing through the LED is constant when the peak value of the input power supply voltage changes.
The invention provides an LED drive circuit with power factor correction in a first aspect, which comprises:
a first sub-circuit, a second sub-circuit, and a third sub-circuit; wherein,
the first sub-circuit comprises a diode, an inductor, a switching tube and a current sensing resistor, wherein the drain electrode of the switching tube is respectively and electrically connected with the anode of the diode and the inductor, and the source electrode of the switching tube is electrically connected with the current sensing resistor;
the inductor is electrically connected with the LED array, an input power supply is respectively connected with the cathode of the diode and the LED array, and the first sub-circuit is used for supplying power to the LED array;
the second sub-circuit comprises a comparator, a logic control unit and a driver, the output end of the comparator is electrically connected with the grid electrode of the switching tube through the logic control unit and the driver in sequence, and the second sub-circuit is used for controlling the switching tube to be turned on or turned off;
the third sub-circuit comprises a divider and a peak detector, the divider is respectively electrically connected with the input power supply, the peak detector and the comparator, the peak detector is electrically connected with the input power supply, the peak detector is used for detecting the peak voltage of the input power supply, the divider is used for removing the peak voltage in the input power supply and generating a reference voltage, the comparator determines the current flowing through the current sensing resistor according to the reference voltage, and the current does not change along with the change of the peak voltage of the input power supply.
Further, the voltage of the input power source is Vpeak | sin (wt) |, the peak voltage is Vpeak, and the reference voltage is | sin (wt) |.
Further, the third sub-circuit further comprises a reference voltage regulator, and the divider is electrically connected with the comparator through the reference voltage regulator; the reference voltage regulator is used for controlling the amplitude of the reference voltage.
Further, the output voltage of the reference voltage regulator is k × | sin (wt) |.
Further, the comparator is specifically configured to compare the output voltage of the reference voltage regulator with the voltage across the current sense resistor.
Further, the ratio isThe critical condition for triggering the switching tube to be turned off by the comparator is k × sin (wt) | ═ RCS*ICS(ii) a Wherein R isCSRepresents the resistance value of the current sensing resistor, ICSRepresenting the current flowing through the current sense resistor.
Furthermore, the logic control unit comprises an RS trigger and a clock, a first input end of the RS trigger is electrically connected to an output end of the comparator, and a second input end of the RS trigger is electrically connected to the clock.
Further, the first sub-circuit further comprises a filter capacitor, and the filter capacitor is connected in parallel with the LED array.
Further, the input power is respectively input to the divider and the peak detector through a divider resistor.
The invention provides an LED driver with power factor correction, which comprises the LED driving circuit with power factor correction.
According to the LED driving circuit with the power factor correction function and the driver, power is supplied to the LED array through the first sub-circuit, the switch of the switch tube is controlled through the second sub-circuit, the switch tube is turned off when the current in the circuit reaches the preset current upper limit, and the switch tube is turned on when the current reaches the preset current lower limit, so that the conversion of a voltage outer ring and a current hysteresis is realized, the envelope of the current flowing through the LED array is changed along with the waveform of the input power voltage, and the LED driving circuit has a high PF value. The preset current upper limit is controlled by reference voltage, the peak value detector of the third sub-circuit detects the peak value voltage of the input power supply, the divider removes the peak value voltage in the input power supply and generates the reference voltage, the influence of the input voltage peak value on the reference voltage is eliminated, and the reference voltage has the same waveform with the input power supply; the comparator determines the current flowing through the current sensing resistor R according to the reference voltageCSI.e. in the voltage outer ring action period, the preset upper limit of the current flowing through the LED array is controlled to be constant, so that the current does not change along with the change of the peak voltage of the input power supplyTherefore, the average current flowing through the LED array is irrelevant to the peak value of the voltage of the input power supply, namely when the voltage of the input power supply changes within the full voltage range, the constant current driving of the LED within the full voltage range is realized, the normal work of the LED array is ensured, and the problem that the LED in the prior art can not be driven by the constant current within the full voltage range is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a circuit in the prior art;
fig. 2 is a schematic structural diagram of an LED driving circuit with power factor correction according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an LED driving circuit with power factor correction according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of an LED driving circuit with power factor correction according to a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Fig. 2 is a schematic structural diagram of an LED driving circuit with power factor correction according to an embodiment of the present invention, and as shown in fig. 2, the LED driving circuit with power factor correction according to the embodiment of the present invention includes:
a first sub-circuit, a second sub-circuit, and a third sub-circuit; wherein,
the first sub-circuit comprises a diode, an inductor, a switching tube and a current sensing resistor, wherein the drain electrode of the switching tube is electrically connected with the anode of the diode and the inductor respectively, and the source electrode of the switching tube is electrically connected with the current sensing resistor;
the inductor is electrically connected with the LED array, the input power supply is respectively connected with the cathode of the diode and the LED array, and the first sub-circuit is used for supplying power to the LED array;
the second sub-circuit comprises a comparator, a logic control unit and a driver, the output end of the comparator is electrically connected with the grid electrode of the switching tube through the logic control unit and the driver in sequence, and the second sub-circuit is used for controlling the switching tube to be turned on or turned off;
the third sub-circuit comprises a divider and a peak detector, wherein the divider is respectively electrically connected with the input power supply, the peak detector and the comparator, the peak detector is electrically connected with the input power supply, the peak detector is used for detecting the peak voltage of the input power supply, the divider is used for removing the peak voltage in the input power supply and generating a reference voltage, the comparator determines the current flowing through the current sensing resistor according to the reference voltage, and the current does not change along with the change of the peak voltage of the input power supply.
In this embodiment, the BUCK circuit is used to correct the power factor of the LED array, and may also be applied to Boost, BUCK-Boost, and self-excited feedback (flyback). Specifically, as shown in fig. 2, the Buck circuit supplies power to the LED array through the first sub-circuit, wherein the switching tube includes two states of on and off, and when the switching tube is turned on, because the diode is not conducting, the input power is grounded through the LED array, the inductor and the current sensing resistor, so as to form a voltage outer ring; when the switch tube is disconnected, a closed loop is formed by the LED array, the inductor and the diode to form a current hysteresis loop. The second sub-circuit is used for controlling the switching tube to be switched on or switched off. In this embodiment, the input power supply is a direct current, may be a pulsating direct current obtained by full-wave rectifying an alternating current, or may be a direct current of another waveform.
In the action period of the voltage outer ring, the switching tube is switched on, the current gradually rises due to the existence of an inductor in the voltage outer ring, when the current in the voltage outer ring rises to a preset current upper limit, the second sub-circuit passes through the comparator, the logic control unit and the driver, the output end of the comparator is electrically connected with the grid electrode of the switching tube through the logic control unit and the driver in sequence, and the second sub-circuit controls the switching tube to be switched off, so that the switching tube enters the current hysteresis loop; in the current hysteresis action period, the switching tube is turned off, when the switching tube is turned off, the LED array, the inductor and the diode form a closed loop, and because the inductor stores energy in the voltage outer loop action period, current flows from the inductor to the LED array through the diode, so that the LED array is continuously driven; in the current hysteresis action period, the current in the current hysteresis is reduced along with the consumption of the LED array to the electric energy, namely the electric energy stored in the inductor, and when the current is smaller than a preset current lower limit, the second sub-circuit controls the switching tube to be opened through the logic control unit and the driver, so that the voltage outer loop action period is entered again, and the inductor stores energy again. Through the circulation, the current flowing through the LED array is modulated by the input voltage waveform, so that the envelope of the current flowing through the LED array changes along with the waveform of the input power supply voltage, and the current has a high PF value. In this embodiment, the upper limit of the preset current is controlled by the reference voltage, and the lower limit of the preset current is controlled by the logic control unit. In general, a reference voltage of the comparator is directly input by the input power or is input after being divided, so that when the input power is changed, the reference voltage is changed, and therefore, an upper limit of a preset current controlled by the reference voltage is changed, which causes a change in an average current flowing through the LED array with the change of the input power, that is, when a peak value of the input power is changed, the average current flowing through the LED array is also changed, which may cause the LED array to fail to emit light normally.
In the embodiment, the peak voltage of the input power supply is detected by the third sub-circuit peak detector, and the divider removes the peak voltage in the input power supply to generate the reference voltage, namely, the divider divides the input power supply voltage by the peak voltage to eliminate the influence of the peak value of the input voltage on the reference voltage, wherein the reference voltage is irrelevant to the peak value of the input power supply and has the same waveform with the input power supply; the comparator determines the current flowing through the current sensing resistor R according to the reference voltageCSThe current of the LED array is controlled to be constant, namely, in the action period of the voltage outer ring, the upper limit of the preset current flowing through the LED array is controlled to be constant, so that the current does not change along with the change of the peak voltage of the input power supply, the average current flowing through the LED array is irrelevant to the peak value of the voltage of the input power supply, namely, when the voltage of the input power supply changes in the full voltage range, the constant current driving of the LED in the full voltage range is realized, and the normal work of the LED is ensured.
As a further improvement of this embodiment, the voltage of the (additional/optional/further) input power supply is pulsating direct current, i.e. Vpeak × | sin (wt) |, peak voltage is Vpeak, and reference voltage is | sin (wt) |. Where w is the angular frequency and t is time. The voltage of the input power supply adopts pulsating direct current, and can be obtained by performing full-wave rectification on alternating current through a bridge rectifier circuit, the bridge rectifier circuit is the most commonly used circuit for converting the alternating current into the direct current, and the LED driving circuit with the power factor correction of the embodiment can directly supply power after the alternating current passes through the bridge rectifier circuit, so that the power supply of an alternating current power grid can be adapted. When the input terminals of the divider and the peak detector are directly connected to the input power source, the peak detector can detect that the peak voltage of the input power source is Vpeak, and the divider divides the input power source by Vpeak to obtain the reference voltage | sin (wt) |. The reference voltage obtained by the third sub-circuit is irrelevant to the peak value of the input power supply and has the same waveform as the voltage waveform of the input power supply.
The LED driving circuit with power factor correction provided in this embodiment supplies power to the LED array through the first sub-circuit, and controls the switching of the switching tube through the second sub-circuit, the switching tube is turned off when the current in the circuit reaches the preset upper current limit, and the switching tube is turned on when the current reaches the preset lower current limit, so as to realize the conversion between the voltage outer loop and the current hysteresis loop, thereby realizing that the envelope of the current flowing through the LED array changes along with the waveform of the input power voltage, and having a very high PF value. The preset current upper limit is controlled by reference voltage, the peak value detector of the third sub-circuit detects the peak value voltage of the input power supply, the divider removes the peak value voltage in the input power supply and generates the reference voltage, the influence of the input voltage peak value on the reference voltage is eliminated, and the reference voltage has the same waveform with the input power supply; the comparator determines the current flowing through the current sensing resistor R according to the reference voltageCSThe current of (1) controlling the upper limit of the preset current flowing through the LED array to be constant in the action period of the voltage outer ring, so that the current does not change along with the change of the peak voltage of the input power supply, and the average current flowing through the LED array is irrelevant to the peak value of the voltage of the input power supply, namely when the voltage of the input power supply changes in the full voltage range, the constant current driving of the LED in the full voltage range is realized, the normal work of the LED array is ensured, and the problem that the LED in the prior art can not be driven by the constant current in the full voltage range is solved.
Example two
Fig. 3 is a schematic structural diagram of an LED driving circuit with power factor correction according to a second embodiment of the present invention, and based on the embodiment shown in fig. 2, the third sub-circuit further includes a reference voltage adjuster, and as shown in fig. 3, the divider is electrically connected to the comparator through the reference voltage adjuster; the reference voltage regulator is used for controlling the amplitude of the reference voltage. Since the reference voltage can control the preset current upper limit in the circuit, the preset current upper limit in the circuit can be adjusted when the reference voltage is adjusted. In this embodiment, a reference voltage regulator is additionally arranged between the output end of the divider and the input end of the comparator, and the amplitude of the reference voltage is controlled by the reference voltage regulator, so that the upper limit of the preset current in the circuit is changed.
Further, after the reference voltage is amplitude-modulated by the reference voltage regulator, the output voltage of the reference voltage regulator is k × | sin (wt) |. Only the peak value of the reference voltage is changed, and the waveform of the reference voltage is not changed, so that the obtained amplitude-modulated reference voltage has no relation with the peak voltage of the input power supply, and is not influenced by the change of the peak voltage of the input power supply.
Further, in this embodiment, the comparator is specifically configured to compare the output voltage of the reference voltage regulator with the voltage across the current sensing resistor. The current of the voltage outer ring is sampled by the current sensing resistor, a voltage to be compared, namely the voltage at two ends of the current sensing resistor, is input to the comparator, the voltage to be compared in the comparator is compared with a reference voltage, and the switching tube is controlled to be closed through the logic control unit and the driver after a preset critical condition is reached.
In this embodiment, the critical condition for the comparator to trigger the switching tube to turn off is k × | sin (wt) | RCS*ICS；
Wherein R isCSRepresenting current sense resistance RCSResistance value of (1)CSIndicating the current flowing through the sense resistor RCSThe current of (2).
The current through the current sense resistor is equal to the current in the circuit in the voltage outer loop, i.e. the current through the LED array. The above relation can be transformed into: i isCS＝k*|sin(wt)|/RCS(ii) a I.e. when the current I flows through the current sensing resistorCSThe critical current k x | sin (wt) |/R is reachedCSAnd meanwhile, the switch-off of the switch tube is realized, so that a current hysteresis action period is entered. At this time, the critical current is the preset upper current limit.
Of course, the preset current in the regulating circuit in this embodimentThe upper limit is set by the resistance R of the current sensing resistorCSThe amplitude of the reference voltage is changed without changing, and the resistance R of the current sensing resistor can be changed without changing the reference voltageCSThe scheme also can realize the purpose of controlling the preset current upper limit, namely ICS＝|sin(wt)|/(n*RCS) Of course, the resistance R of the resistor can also be sensed by the amplitude of the reference voltage and the currentCSAdjustment is performed simultaneously.
In this embodiment, the logic control unit includes an RS flip-flop and a clock, a first input terminal of the RS flip-flop is electrically connected to an output terminal of the comparator, and a second input terminal of the RS flip-flop is electrically connected to the clock. As shown in fig. 3, specifically, the reset terminal R of the RS flip-flop is electrically connected to the output terminal of the comparator, the set terminal S of the RS flip-flop is electrically connected to the clock, and the output terminal Q of the RS flip-flop is electrically connected to the driver, wherein the + input terminal of the comparator inputs the voltage across the current sensing resistor, and the-input terminal of the comparator inputs the reference voltage. When the voltage across the current sensing resistor reaches the reference voltage, i.e., k × sin (wt) | RCS*ICSWhen the trigger condition of the comparator is met, the comparator outputs a high level signal '1', namely R is equal to 1, the set clock is a low level signal '0', namely S is equal to 0, the output end Q of the RS trigger outputs a high level signal '1', and the driver is controlled to act to close the switching tube; after the switch tube is closed, the current flows through RCSIs 0, then RCSThe voltage at the two ends is 0, at this time, the comparator outputs a low level signal "0", that is, R equals 0, when the clock is a high level signal "1", that is, S equals 1, the output end Q of the RS flip-flop outputs a low level signal "0", and at this time, the driver is controlled to turn on the switching tube. The switching tube can be controlled to be opened by controlling the clock signal, so that the conversion from the current hysteresis loop to the voltage outer loop is controlled, namely the preset current lower limit in the current hysteresis loop is controlled.
Of course, the logic control unit of this embodiment is not limited to the RS flip-flop, and other logic flip-flops capable of implementing this scheme are also within the scope of the present invention.
As a further improvement of this embodiment, the first sub-circuit further includes a filter capacitor, and the filter capacitor is connected in parallel with the LED array. The filter capacitor is an energy storage device which is arranged at two ends of the rectifying circuit and used for reducing the alternating current ripple coefficient and improving the high-efficiency smooth direct current output, the working performance of the electronic circuit can be more stable by arranging the filter capacitor, and meanwhile, the interference of the alternating current ripple on the electronic circuit is also reduced. The filter capacitor not only enables the direct current output of the power supply to be stable, reduces the influence of alternating ripple on the electronic circuit, but also can absorb the current fluctuation generated in the working process of the electronic circuit and the interference of the alternating current power supply in series, so that the working performance of the circuit is more stable.
In the embodiment, a reference voltage regulator is additionally arranged between the output end of the divider and the input end of the comparator, and the amplitude of the reference voltage is controlled by the reference voltage regulator, so that the upper limit of the preset current in the circuit is changed to control the switching-off of the switching tube, and the upper limit of the current flowing through the LED can be regulated; the conduction of the switch tube is controlled by the RS trigger and the clock of the logic control unit, namely, the preset lower current limit in the current hysteresis loop is controlled. Therefore, the scheme can realize the control of the upper limit and the lower limit of the current flowing through the LED array, thereby controlling the average current flowing through the LED array and realizing the normal light emission of the LED array. In addition, the filter capacitors are connected in parallel at two ends of the LED array, so that the working performance of the circuit is more stable.
EXAMPLE III
Fig. 4 is a schematic structural diagram of an LED driving circuit with power factor correction according to a third embodiment of the present invention, and as shown in fig. 4, an input power is respectively input to a divider and a peak detector through a voltage dividing resistor on the basis of the third embodiment shown in fig. 3. As shown in fig. 4, the input power is divided by the first resistor and the second resistor of the voltage dividing resistor, and then is input to the divider and the peak detector, respectively, that is, the voltage input to the divider and the peak detector is Vpeak × R1/(R1+R2) | sin (wt) |, wherein the first resistance is R1The second resistance value is R2The peak voltage detected by the peak detector is Vpeak R1/(R1+R2) The reference voltage generated after the divider operation is still | sin (wt) |.
In the embodiment, the input voltage is divided and then input into the divider and the peak detector, so that the input voltage of the divider and the peak detector is reduced, higher requirements on the divider and the peak detector can be reduced, the cost is reduced, the divider and the peak detector can be protected, and the service life is prolonged.
Example four
The fourth embodiment of the invention provides an LED driver with power factor correction, which includes the above LED driving circuit with power factor correction.
The LED driver with power factor correction provided by this embodiment solves the problem in the prior art that constant current driving cannot be performed within a full voltage range, and can achieve the purpose of making the average current flowing through the LED constant at different input voltages, that is, making the average current flowing through the LED constant when the peak value of the input power supply voltage changes. As will be clear to those skilled in the art, for convenience and brevity of description, specific implementations of the LED driver may be referred to in the circuit embodiments, and are not described herein again.
The connection relationships between the elements in the above embodiments are not limited to the connection relationships described in the specification and the drawings, and the positions and connection relationships of some elements may be changed on the premise that the technical solutions of the embodiments of the present invention can be implemented.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An LED driving circuit with power factor correction, comprising: a first sub-circuit, a second sub-circuit, and a third sub-circuit; wherein,
the first sub-circuit comprises a diode, an inductor, a switching tube and a current sensing resistor, wherein the drain electrode of the switching tube is respectively and electrically connected with the anode of the diode and the inductor, and the source electrode of the switching tube is electrically connected with the current sensing resistor;
the inductor is electrically connected with the LED array, an input power supply is respectively connected with the cathode of the diode and the LED array, and the first sub-circuit is used for supplying power to the LED array;
the second sub-circuit comprises a comparator, a logic control unit and a driver, the output end of the comparator is electrically connected with the grid electrode of the switching tube through the logic control unit and the driver in sequence, and the second sub-circuit is used for controlling the switching tube to be turned on or turned off;
the third sub-circuit comprises a divider and a peak detector, the divider is respectively electrically connected with the input power supply, the peak detector and the comparator, the peak detector is electrically connected with the input power supply, the peak detector is used for detecting the peak voltage of the input power supply, the divider is used for removing the peak voltage in the input power supply and generating a reference voltage, the comparator determines the current flowing through the current sensing resistor according to the reference voltage, and the current does not change along with the change of the peak voltage of the input power supply.
2. The driving circuit of claim 1, wherein the input power supply has a voltage of Vpeak | sin (wt) |, the peak voltage is Vpeak, and the reference voltage is | sin (wt) |.
3. The driving circuit of claim 2, wherein the third sub-circuit further comprises a reference voltage regulator, and wherein the divider is electrically connected to the comparator through the reference voltage regulator;
the reference voltage regulator is used for controlling the amplitude of the reference voltage.
4. The driving circuit of claim 3, wherein the output voltage of the reference voltage regulator is k x | sin (wt) |.
5. The driver circuit of claim 4, wherein the comparator is specifically configured to compare the output voltage of the reference voltage regulator with the voltage across the current sense resistor.
6. The driving circuit according to claim 5, wherein the critical condition for the comparator to trigger the switching tube to turn off is k | sin (wt) | RCS*ICS；
Wherein R isCSRepresents the resistance value of the current sensing resistor, ICSRepresenting the current flowing through the current sense resistor.
7. The driving circuit according to claim 6, wherein the logic control unit comprises a reset-set RS flip-flop and a clock, a first input terminal of the RS flip-flop is electrically connected with the output terminal of the comparator, and a second input terminal of the RS flip-flop is electrically connected with the clock.
8. The driver circuit according to any of claims 1-7, wherein the first sub-circuit further comprises a filter capacitor connected in parallel with the LED array.
9. The driving circuit according to claim 8, wherein the input power is input to the divider and the peak detector through voltage dividing resistors, respectively.
10. An LED driver with power factor correction, comprising: a driver circuit as claimed in any one of claims 1 to 9.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106714382B (en) * | 2017-01-11 | 2018-05-04 | 福州华芯电子有限公司 | Quantization PFC based on the detection of full voltage wave crest |
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| CN108093508A (en) * | 2016-11-23 | 2018-05-29 | 晶豪科技股份有限公司 | Light emitting diode driving module |
| CN106714382B (en) * | 2017-01-11 | 2018-05-04 | 福州华芯电子有限公司 | Quantization PFC based on the detection of full voltage wave crest |
| CN108495416A (en) * | 2018-04-19 | 2018-09-04 | 中山市欧帝尔电器照明有限公司 | LED constant current driving temperature protects chip and LED light |
| CN108495416B (en) * | 2018-04-19 | 2024-04-23 | 中山市欧帝尔电器照明有限公司 | LED constant-current driving temperature protection chip and LED lamp |
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