CN108770124B - LED drive circuit and lighting equipment - Google Patents
LED drive circuit and lighting equipment Download PDFInfo
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- CN108770124B CN108770124B CN201810644245.6A CN201810644245A CN108770124B CN 108770124 B CN108770124 B CN 108770124B CN 201810644245 A CN201810644245 A CN 201810644245A CN 108770124 B CN108770124 B CN 108770124B
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- 238000001514 detection method Methods 0.000 claims abstract description 83
- 239000003990 capacitor Substances 0.000 claims abstract description 62
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- 230000001276 controlling effect Effects 0.000 claims abstract description 29
- 238000005070 sampling Methods 0.000 claims description 21
- 230000004044 response Effects 0.000 claims description 11
- 230000009123 feedback regulation Effects 0.000 claims description 10
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- 230000001419 dependent effect Effects 0.000 description 3
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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]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The application discloses an LED driving circuit and lighting equipment, comprising a control circuit and a resonance circuit, wherein the control circuit comprises a feedback regulating circuit, a turn-off control circuit and a switching circuit. The feedback regulating circuit firstly detects the output parameter of the resonant circuit to obtain a detection parameter, and makes a difference between a given reference parameter and the detection parameter, and then the deviation is subjected to proportional integral regulation to obtain a feedback voltage. When the turn-off control circuit detects that the voltage of the resonant capacitor rises to the feedback voltage, the switch tube connected with the turn-off control circuit is controlled to be turned off so as to adjust the driving signals of the upper switch tube and the lower switch tube, and therefore the working frequency of the resonant circuit is adjusted so as to stabilize the output parameters. In the control mode of the application, the switching circuit can set whether the control circuit works in a fast loop or a slow loop only according to the output voltage of the resonant circuit, thereby simplifying the switching basis; and even if the LED device has a dimming function, the dimming signal does not need to be considered, so that a circuit for controlling the switching loop state becomes simple and accurate.
Description
Technical Field
The present application relates to the field of lighting technologies, and in particular, to an LED driving circuit and a lighting device.
Background
At present, the LED (Light Emitting Diode ) has the advantages of high light efficiency, long service life, no pollution and the like, and is widely applied to the field of illumination. In the prior art, an LED driving circuit for driving an LED to operate includes: the resonant circuit comprises a resonant capacitor Cr, an upper switching tube Q1 and a lower switching tube Q2 which are alternately conducted (refer to fig. 1, fig. 1 is a topology diagram of a resonant circuit in the prior art), and a control circuit for controlling the resonant circuit.
For circuit applications with a relatively wide operating range, to stabilize the control circuit, the control circuit typically sets the inner loop to two operating states: a fast loop state (fast loop) and a slow loop state (slow loop). In general, a voltage-controlled control chip is selected as the control circuit, and in a resonant circuit controlled by voltage control, the switching basis of the loop state is the output power of the resonant circuit, and when the output power is low, the switching is performed to the fast loop, and when the output power is high, the switching is performed to the slow loop. Therefore, for the voltage-controlled control circuit, the switching basis of the loop state needs to consider the output voltage and the output current at the same time, so that the switching basis is complex; if the LED also has a dimming function, the dimming signal is considered within the switching basis, which results in a complicated circuit for controlling the state of the switching loop, and the more variables considered by the switching basis, the more the relationships between the variables cannot be coordinated, which results in an inaccurate determined switching point.
Therefore, how to provide a solution to the above technical problem is a problem that a person skilled in the art needs to solve at present.
Disclosure of Invention
The application aims to provide an LED driving circuit and lighting equipment, wherein a switching circuit can set a control circuit to work in a fast loop or a slow loop only according to the output voltage of a resonant circuit, so that the switching basis is simplified; since the switching basis of the switching circuit is only related to the output voltage of the resonant circuit, even if the LED device has a dimming function, the dimming signal does not need to be considered, so that the circuit for controlling the state of the switching loop becomes simple and accurate.
In order to solve the technical problems, the application provides an LED driving circuit, which comprises a control circuit, an upper switching tube, a lower switching tube and a resonant circuit, wherein the resonant circuit comprises a resonant capacitor, the upper switching tube and the lower switching tube are alternately conducted, and the resonant circuit is used for driving a Light Emitting Diode (LED) device to emit light, and the control circuit comprises:
the feedback regulating circuit is used for detecting the output parameters of the resonant circuit, differencing the preset given reference parameters and the obtained detection parameters, and regulating the deviation through proportional integral to obtain feedback voltage;
the input end of the switching-off control circuit is connected with the output end of the feedback regulating circuit, and the switching-off control circuit is used for controlling any selected switching tube in the resonant circuit to be switched off and correspondingly regulating the driving signal of the other switching tube when the voltage of the resonant capacitor rises to the feedback voltage;
and the switching circuit is used for controlling the feedback regulating circuit to switch to a fast loop so as to accelerate the response speed of the feedback regulating circuit when the detected output voltage of the resonant circuit is not less than a preset voltage, and otherwise, switching to a slow loop.
Preferably, the detected output parameter of the resonant circuit is in particular an output current.
Preferably, the output terminal of the resonant circuit comprises an output positive terminal and an output negative terminal; the feedback regulation circuit comprises a sampling resistor, an input resistor, an operational amplifier and a loop circuit, wherein:
the first end of the sampling resistor is connected with the output negative end of the resonant circuit, the common end of the sampling resistor is grounded, the second end of the sampling resistor is respectively connected with the input negative end of the LED device and the first end of the input resistor, the second end of the input resistor is respectively connected with the input negative end of the operational amplifier and the first end of the loop circuit, the input positive end of the operational amplifier inputs the given reference parameter, the output end of the operational amplifier is connected with the second end of the loop circuit, the common end of the operational amplifier is used as the output end of the feedback regulating circuit, and the switching end of the loop circuit is used as the switching end of the feedback regulating circuit;
the switching circuit is specifically configured to increase the equivalent resistance value of the loop circuit or decrease the equivalent capacitance value of the loop circuit when the detected output voltage of the resonant circuit is not less than a preset voltage, so as to control the feedback adjustment circuit to switch to the fast loop, and vice versa.
Preferably, the loop circuit includes a first switching tube, a first resistor, a second resistor, a third resistor, and a first capacitor, wherein:
the first end of the first switch tube is respectively connected with the first end of the second resistor and the first end of the third resistor, the common end of the first switch tube is used as the first end of the loop circuit, the second end of the third resistor is connected with the first end of the first capacitor, the second end of the first switch tube is connected with the first end of the first resistor, the second end of the first resistor is respectively connected with the second end of the second resistor and the second end of the first capacitor, the common end of the first switch tube is used as the second end of the loop circuit, and the control end of the first switch tube is used as the switching end of the loop circuit.
Preferably, the loop circuit includes a second switching tube, a fourth resistor, a fifth resistor, and a second capacitor, wherein:
the first end of the second switch tube is connected with the first end of the fifth resistor, the common end of the second switch tube is used as the first end of the loop circuit, the second end of the second switch tube is connected with the first end of the fourth resistor, the second end of the fourth resistor is respectively connected with the second end of the fifth resistor and the first end of the second capacitor, the second end of the second capacitor is used as the second end of the loop circuit, and the control end of the second switch tube is used as the switching end of the loop circuit.
Preferably, the off control circuit includes:
the input end is used as the comparison circuit of the input end of the turn-off control circuit and is used for comparing the voltage of the resonance capacitor with the feedback voltage, and when the voltage of the resonance capacitor rises to the feedback voltage, a turn-off signal is generated;
and the switching tube driving circuit is used for controlling the selected switching tube to be turned off when the turn-off signal is detected, and correspondingly adjusting the driving signal of the other switching tube.
Preferably, the comparing circuit is specifically a first comparator, one input end of the first comparator is used as an input end of the comparing circuit, the other input end of the first comparator inputs the voltage of the resonant capacitor or the sampling value thereof, and the output end of the first comparator is connected with the input end of the switching tube driving circuit.
Preferably, the switching circuit includes:
the detection end is used as a detection comparison circuit of the detection end of the switching circuit and is used for detecting the output voltage of the resonant circuit, comparing the detected output voltage with a preset voltage, and generating a fast loop switching signal by the output end when the detected output voltage is not smaller than the preset voltage, otherwise, generating a slow loop switching signal;
and the driving end is used as a switching driving circuit of the control end of the switching circuit and is used for correspondingly driving the feedback regulating circuit to switch to a fast loop or a slow loop when the fast loop switching signal or the slow loop switching signal is detected so as to correspondingly accelerate or slow down the response speed.
Preferably, the detection end of the detection comparison circuit comprises a first detection end and a second detection end, the output end of the resonance circuit comprises an output positive end and an output negative end, the first detection end of the detection comparison circuit is connected with the output positive end of the resonance circuit, the second detection end of the detection comparison circuit is connected with the output negative end of the resonance circuit, and the common end of the second detection end of the detection comparison circuit is grounded; the detection comparison circuit comprises a first voltage dividing resistor, a second voltage dividing resistor and a second comparator, wherein:
the first end of the first voltage dividing resistor is used as a first detection end of the detection comparison circuit, the second end of the first voltage dividing resistor is respectively connected with the first end of the second voltage dividing resistor and one of the input ends of the second comparator, the second end of the second voltage dividing resistor is used as a second detection end of the detection comparison circuit, the other input end of the second comparator inputs the preset voltage, and the output end of the second comparator is used as an output end of the detection comparison circuit.
In order to solve the technical problem, the application also provides a lighting device which comprises an LED device and also comprises any LED driving circuit.
The application provides an LED driving circuit, which comprises a control circuit and a resonance circuit. The feedback regulating circuit firstly detects the output parameter of the resonant circuit to obtain a detection parameter, and makes a difference between a given reference parameter and the detection parameter, and then the deviation is subjected to proportional integral regulation to obtain a feedback voltage, wherein the feedback voltage represents the deviation degree of the reference parameter and the detection parameter. Then, when the turn-off control circuit detects that the voltage of the resonant capacitor rises to the feedback voltage, the switch tube connected with the turn-off control circuit is controlled to turn off so as to adjust the driving signals of the upper switch tube and the lower switch tube, thereby adjusting the working frequency of the resonant circuit, and controlling the output parameter of the resonant circuit through the working frequency so that the output parameter gradually approaches a given reference parameter to stabilize the output parameter.
In the control mode of the application, the stability of the control circuit is not dependent on the output power of the resonant circuit any more, and is only related to the output voltage of the resonant circuit, specifically, when the switching circuit detects that the output voltage of the resonant circuit is not less than the set voltage, the feedback regulating circuit is controlled to switch to the fast loop so as to accelerate the response speed of the feedback regulating circuit, otherwise, the feedback regulating circuit is switched to the slow loop. Therefore, the switching circuit can set whether the control circuit works in a fast loop or a slow loop only according to the output voltage of the resonant circuit, so that the switching basis is simplified; since the switching basis of the switching circuit is only related to the output voltage of the resonant circuit, even if the LED device has a dimming function, the dimming signal does not need to be considered, so that the circuit for controlling the state of the switching loop becomes simple and accurate.
The application also provides a lighting device which has the same beneficial effects as the LED driving circuit.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required in the prior art and the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a topology of a resonant circuit of the prior art;
fig. 2 is a schematic structural diagram of an LED driving circuit according to the present application;
fig. 3 is a schematic structural diagram of another LED driving circuit according to the present application;
fig. 4 (a) is a schematic structural diagram of a first loop circuit according to the present application;
fig. 4 (b) is a schematic structural diagram of a second loop circuit according to the present application;
fig. 4 (c) is a schematic structural diagram of a third loop circuit according to the present application.
Detailed Description
The core of the application is to provide an LED driving circuit and lighting equipment, the switching circuit can set the control circuit to work in a fast loop or a slow loop only according to the output voltage of the resonant circuit, thereby simplifying the switching basis; since the switching basis of the switching circuit is only related to the output voltage of the resonant circuit, even if the LED device has a dimming function, the dimming signal does not need to be considered, so that the circuit for controlling the state of the switching loop becomes simple and accurate.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of 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, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a first LED driving circuit according to the present application.
The LED driving circuit comprises a control circuit 1, an upper switching tube, a lower switching tube and a resonant circuit 2, wherein the upper switching tube and the lower switching tube comprise a resonant capacitor and are alternately conducted, and the resonant circuit 2 is used for driving a light-emitting diode (LED) device to emit light, wherein the control circuit 1 comprises:
the feedback adjustment circuit 21 is configured to detect an output parameter of the resonant circuit 2, make a difference between a preset reference parameter and the obtained detected parameter, and adjust the deviation by proportional integral to obtain a feedback voltage;
the turn-off control circuit 22, the input end of which is connected with the output end of the feedback regulation circuit 21, is used for controlling any selected switching tube in the resonance circuit 2 to turn off when the voltage of the resonance capacitor rises to the feedback voltage, and correspondingly adjusting the driving signal of the other switching tube;
and the switching circuit 23, the detection end of which is connected with the output end of the resonant circuit 2 and the control end of which is connected with the switching end of the feedback regulating circuit 21, is used for controlling the feedback regulating circuit 21 to switch to the fast loop so as to accelerate the response speed of the resonant circuit when the detected output voltage of the resonant circuit 2 is not less than the preset voltage, and otherwise, switching to the slow loop.
It should be noted that, the preset in the present application is set in advance, and only needs to be set once, and no resetting is needed unless the preset is modified according to the actual situation.
Specifically, the LED driving circuit in the present application includes the control circuit 1 and the resonant circuit 2, where the resonant circuit 2 may be a three-element resonant circuit, such as an LLC resonant circuit (fig. 1, lm represents an excitation inductance of a transformer, lr represents a resonant inductance, and Cr represents a resonant capacitance) and an LCC resonant circuit, and may be a four-element resonant circuit or other multi-element resonant circuit, and the present application is not limited herein. However, whether a few element resonant circuits are chosen, one condition is followed: the resonant circuit includes a resonant capacitor.
In addition, the resonant circuit 2 includes an upper switching tube and a lower switching tube that are alternately turned on, and the duty ratio of driving signals for driving the upper switching tube and the lower switching tube to be turned on is 50%, so the on/off time of one switching tube can be estimated by knowing the on/off time of the other switching tube.
The control circuit 1 is used for controlling the resonant circuit 2 and comprises a feedback regulating circuit 21, a turn-off control circuit 22 and a switching circuit 23, wherein the feedback regulating circuit 21 and the turn-off control circuit 22 together form a circuit for controlling the output parameter of the resonant circuit 2 to be stable, and the switching circuit 23 is used for controlling the loop state of the feedback regulating circuit 21, namely controlling the response speed of the feedback regulating circuit 21 to the change of the output parameter.
More specifically, the output parameter of the stable resonant circuit 2 of the present application may be an output current or an output voltage, which may all play a role in stabilizing the resonant circuit 2. For the stable output parameter of the application, the application sets a given reference parameter in advance, namely the value reached by the output parameter of the stable resonant circuit 2. The process of controlling the output parameter of the resonant circuit 2 to stabilize to a given reference parameter comprises:
first, the feedback adjustment circuit 21 detects the output parameter of the resonant circuit 2 to obtain a detected parameter, and makes a difference between a given reference parameter and the obtained detected parameter to obtain a deviation therebetween, and adjusts the deviation by proportional integral to obtain a feedback voltage, so that the feedback voltage reflects the degree to which the detected parameter deviates from the given reference parameter, and when the degree of deviation therebetween increases, the value of the feedback voltage also increases.
Secondly, the application considers that the upper and lower switching tubes in the resonant circuit 2 work alternately, and the voltage of the resonant capacitor contained in the resonant circuit also changes in a period of rising and falling trend, so that a certain corresponding relation exists between the on/off time of the upper and lower switching tubes of the resonant circuit 2 and the voltage of the resonant capacitor; the application also considers that changing the on/off time of the upper and lower switching tubes of the resonant circuit 2 changes the working frequency of the resonant circuit 2, so as to change the output parameter of the resonant circuit 2, so that the turn-off control circuit 22 detects the voltage of the resonant capacitor (Vcs represents the voltage of the resonant capacitor in fig. 2), and when the voltage of the resonant capacitor rises to the feedback voltage, any selected switching tube (upper switching tube or lower switching tube, the selected switching tube is the main switching tube) in the resonant circuit 2 is controlled to turn off, so that the driving signal of the other switching tube is correspondingly adjusted, so as to adjust the working frequency of the resonant circuit 2, and further adjust the output parameter of the resonant circuit 2, so that the output parameter gradually approaches to the given reference parameter, so as to stabilize the output parameter. Further, the application selects the lower switching tube as the main switching tube.
It can be seen that, unlike the existing voltage-controlled control circuit, the control circuit 1 of the present application adopts a new control mode, i.e. by detecting the voltage of the resonant capacitor, to control the main switching tube in the resonant circuit 2 to be turned off. The control mode is different from a voltage-controlled control mode, wherein the voltage-controlled control mode adjusts the frequency of the resonant circuit by directly controlling the operating frequency of the switching tube, and the control mode of the application selects the turn-off time of the switching tube and indirectly controls the operating frequency of the switching tube to influence the frequency of the resonant circuit 2 (the frequency of the resonant circuit 2 directly relates to the output power of the resonant circuit 2). The inherent features of this control mode of the application are: the stability of the circuit is only related to the output voltage of the resonant circuit 2, and is not dependent on the output power of the resonant circuit 2, so that the switching basis is simplified, and the circuit for controlling the state of the switching loop is simple and accurate.
In the control mode of the present application, the control loop is required to respond quickly when the output voltage of the resonant circuit 2 is high, and to respond slowly when the output voltage is low. Therefore, the switching circuit 23 detects the output voltage of the resonant circuit 2 (Vo represents the output voltage in fig. 2), and when the output voltage of the resonant circuit 2 is not less than the set voltage, the feedback regulation circuit 21 is controlled to switch to the fast loop so as to accelerate the response speed thereof to the change of the output parameter; when the output voltage of the resonance circuit 2 is smaller than the set voltage, the feedback regulation circuit 21 is controlled to switch to a slow loop to slow down its response speed to the change of the output parameter, thereby stabilizing the control circuit 1.
The application provides an LED driving circuit, which comprises a control circuit and a resonance circuit. The feedback regulating circuit firstly detects the output parameter of the resonant circuit to obtain a detection parameter, and makes a difference between a given reference parameter and the detection parameter, and then the deviation is subjected to proportional integral regulation to obtain a feedback voltage, wherein the feedback voltage represents the deviation degree of the reference parameter and the detection parameter. Then, when the turn-off control circuit detects that the voltage of the resonant capacitor rises to the feedback voltage, the switch tube connected with the turn-off control circuit is controlled to turn off so as to adjust the driving signals of the upper switch tube and the lower switch tube, thereby adjusting the working frequency of the resonant circuit, and controlling the output parameter of the resonant circuit through the working frequency so that the output parameter gradually approaches a given reference parameter to stabilize the output parameter.
In the control mode of the application, the stability of the control circuit is not dependent on the output power of the resonant circuit any more, and is only related to the output voltage of the resonant circuit, specifically, when the switching circuit detects that the output voltage of the resonant circuit is not less than the set voltage, the feedback regulating circuit is controlled to switch to the fast loop so as to accelerate the response speed of the feedback regulating circuit, otherwise, the feedback regulating circuit is switched to the slow loop. Therefore, the switching circuit can set whether the control circuit works in a fast loop or a slow loop only according to the output voltage of the resonant circuit, so that the switching basis is simplified; since the switching basis of the switching circuit is only related to the output voltage of the resonant circuit, even if the LED device has a dimming function, the dimming signal does not need to be considered, so that the circuit for controlling the state of the switching loop becomes simple and accurate.
Referring to fig. 3, fig. 3 is a schematic structural diagram of another LED driving circuit according to the present application, where the LED driving circuit is based on the above embodiments:
as a preferred embodiment, the detected output parameter of the resonant circuit 2 is in particular the output current.
Specifically, in the present application, the feedback adjustment circuit 21 detects the output current of the resonant circuit 2 (Io in fig. 3 represents the output current), and the control circuit 1 controls the output current of the resonant circuit 2.
As a preferred embodiment, the output terminals of the resonant circuit 2 comprise an output positive terminal and an output negative terminal; the feedback adjustment circuit 21 includes a sampling resistor Rsc, an input resistor Re, an operational amplifier U, and a loop circuit 211, wherein:
the first end of the sampling resistor Rsc is connected with the output negative end of the resonant circuit 2, the common end of the sampling resistor Rsc is grounded, the second end of the sampling resistor Rsc is respectively connected with the input negative end of the LED device and the first end of the input resistor Re, the second end of the input resistor Re is respectively connected with the input negative end of the operational amplifier U and the first end of the loop circuit 211, the input positive end of the operational amplifier U inputs a given reference parameter, the output end of the operational amplifier U is connected with the second end of the loop circuit 211, the common end of the operational amplifier U is used as the output end of the feedback regulating circuit 21, and the switching end of the loop circuit 211 is used as the switching end of the feedback regulating circuit 21;
the switching circuit 23 is specifically configured to increase the equivalent resistance value of the loop circuit 211 or decrease the equivalent capacitance value of the loop circuit 211 when the detected output voltage of the resonant circuit 2 is not less than the preset voltage, so as to control the feedback adjustment circuit 21 to switch to the fast loop, and vice versa.
Specifically, regarding "detection" of the feedback regulation circuit 21, a detection circuit should be provided inside the feedback regulation circuit 21 to detect an output parameter of the resonant circuit 2 to obtain a detection signal (detection parameter), for example, an output current of the resonant circuit 2 is detected by a series sampling resistor, thereby obtaining a current detection signal; the output voltage of the resonance circuit 2 is detected by a voltage dividing resistor, thereby obtaining a voltage detection signal. Similarly, the "detection" of the switching circuit 23 is also a detection circuit provided in the circuit.
Based on the output current of the resonant circuit 2 detected by the feedback adjustment circuit 21, the feedback adjustment circuit 21 includes a sampling resistor Rsc, an input resistor Re, an operational amplifier U and a loop circuit 211, wherein the amplification adjustment of the operational amplifier U is actually proportional integral adjustment, and the proportional parameter and the integral parameter are determined according to the resistance in the loop circuit 211 and the input resistor Re.
Principle of feedback regulation circuit 21: the sampling resistor Rsc detects the output current of the resonant circuit 2 to obtain a current detection signal, the current detection signal is limited by the input resistor Re to obtain an input voltage of the input negative terminal of the operational amplifier U, and since the input positive terminal of the operational amplifier U inputs a given reference parameter (Vr in fig. 3 represents the given reference parameter), the operational amplifier U obtains a difference value between the given reference parameter and the input voltage, and adjusts the difference value according to the proportional integral parameter corresponding to the loop circuit 211 and the input resistor Re to obtain a feedback voltage.
With respect to the above-described circuit, the present application actually stabilizes the input voltage of the negative input terminal of the operational amplifier U to a given reference parameter, and the input voltage represents the output current of the resonant circuit 2, so that when a specific parameter value is set for the given reference parameter, it should be set for the actual circuit.
Further, with the feedback adjustment circuit 21 of the present embodiment, the switching circuit 23 controls the principle of loop state switching of the feedback adjustment circuit 21: when the detected output voltage of the resonance circuit 2 is not less than the set voltage, the switching circuit 23 increases the equivalent resistance value of the loop circuit 211 or decreases the equivalent capacitance value of the loop circuit 211, thereby controlling the feedback regulation circuit 21 to switch to the fast loop; when the detected output voltage of the resonance circuit 2 is smaller than the set voltage, the switching circuit 23 decreases the equivalent resistance value of the loop circuit 211 or increases the equivalent capacitance value of the loop circuit 211, thereby controlling the feedback regulation circuit 21 to switch to the slow loop.
As a preferred embodiment, the loop circuit 211 includes a first switching tube K1, a first resistor R1, a second resistor R2, a third resistor R3, and a first capacitor C1, wherein:
the first end of the first switch tube K1 is connected with the first end of the second resistor R2 and the first end of the third resistor R3 respectively, the common end of the first switch tube K1 is used as the first end of the loop circuit 211, the second end of the third resistor R3 is connected with the first end of the first capacitor C1, the second end of the first switch tube K1 is connected with the first end of the first resistor R1, the second end of the first resistor R1 is connected with the second end of the second resistor R2 and the second end of the first capacitor C1 respectively, the common end of the first switch tube K1 is used as the second end of the loop circuit 211, and the control end of the first switch tube K1 is used as the switching end of the loop circuit 211.
Specifically, the switching circuit 23 in this embodiment realizes the change of the equivalent resistance value of the loop circuit 211 by controlling the on-off of the first switching tube K1: when the first switching tube K1 is controlled to be turned on, the equivalent resistance value of the loop circuit 211 is reduced, so that the feedback regulating circuit 21 is switched to the slow loop; when the first switching transistor K1 is controlled to be turned off, the equivalent resistance value of the loop circuit 211 increases, so that the feedback adjustment circuit 21 is switched to the fast loop.
In the present application, the loop circuit 211 may have other circuit structures besides the circuit structure in fig. 3, please refer to fig. 4 (a), fig. 4 (b) and fig. 4 (c), and fig. 4 (a) is a schematic structural diagram of a first loop circuit provided in the present application; fig. 4 (b) is a schematic structural diagram of a second loop circuit according to the present application; fig. 4 (c) is a schematic structural diagram of a third loop circuit according to the present application.
As a preferred embodiment, the loop circuit includes a second switching tube K2, a fourth resistor R4, a fifth resistor R5, and a second capacitor C2, wherein:
the first end of the second switch tube K2 is connected to the first end of the fifth resistor R5, the common end thereof is used as the first end of the loop circuit 211, the second end of the second switch tube K2 is connected to the first end of the fourth resistor R4, the second end of the fourth resistor R4 is respectively connected to the second end of the fifth resistor R5 and the first end of the second capacitor C2, the second end of the second capacitor C2 is used as the second end of the loop circuit 211, and the control end of the second switch tube K2 is used as the switching end of the loop circuit 211.
Referring to fig. 4 (a), similarly, in the present embodiment, the switching circuit 23 controls the on/off of the second switching tube K2 to change the equivalent resistance value of the loop circuit 211, thereby switching the loop state of the feedback adjustment circuit 21.
Alternatively, referring to fig. 4 (b), the loop circuit 211 includes a third switch tube K3, a third capacitor C3, a fourth capacitor C4 and a sixth resistor R6, wherein:
the first end of the third switch tube K3 is connected to the first end of the fourth capacitor C4, the common end thereof is used as the first end of the loop circuit 211, the second end of the third switch tube K3 is connected to the first end of the third capacitor C3, the second end of the third capacitor C3 is respectively connected to the second end of the fourth capacitor C4 and the first end of the sixth resistor R6, the second end of the sixth resistor R6 is used as the second end of the loop circuit 211, and the control end of the third switch tube K3 is used as the switching end of the loop circuit 211.
Specifically, the switching circuit 23 in this embodiment realizes the change of the equivalent capacitance value of the loop circuit 211 by controlling the on/off of the third switching tube K3: when the third switching tube K3 is controlled to be turned on, the equivalent capacitance value of the loop circuit 211 increases, so that the feedback regulating circuit 21 is switched to the slow loop; when the third switching transistor K3 is controlled to be turned off, the equivalent capacitance value of the loop circuit 211 decreases, so that the feedback adjustment circuit 21 is switched to the fast loop.
Alternatively, referring to fig. 4 (C), the loop circuit 211 includes a seventh resistor R7, an eighth resistor R8, a fourth switching tube K4, and a fifth capacitor C5, wherein: the first end of the seventh resistor R7 is used as the first end of the loop circuit 211, the second end of the seventh resistor R7 is respectively connected with the first end of the eighth resistor R8 and the first end of the fourth switching tube K4, the second end of the eighth resistor R8 is respectively connected with the second end of the fourth switching tube K4 and the first end of the fifth capacitor C5, the second end of the fifth capacitor C5 is used as the second end of the loop circuit 211, and the control end of the fourth switching tube K4 is used as the switching end of the loop circuit 211.
It is understood that the switching tube of the loop circuit 211 is not limited to the embodiment of the present application, as long as the switching tube can change the magnitude of the equivalent resistance value or the magnitude of the equivalent capacitance value in the loop circuit 211.
As a preferred embodiment, the shutdown control circuit 22 includes:
the input end is used as a comparison circuit of the input end of the turn-off control circuit 22 and is used for comparing the voltage of the resonant capacitor with the feedback voltage, and when the voltage of the resonant capacitor rises to the feedback voltage, a turn-off signal is generated;
and the switching tube driving circuit is used for controlling the selected switching tube to be switched off when the switching-off signal is detected, and correspondingly adjusting the driving signal of the other switching tube.
Specifically, the turn-off control circuit 22 includes a comparison circuit and a switching tube driving circuit, the comparison circuit compares the voltage of the resonance capacitor with the feedback voltage, and when the voltage of the resonance capacitor rises to the feedback voltage, a turn-off signal is generated and input to the switching tube driving circuit; and then the switching tube driving circuit controls the selected switching tube to be turned off after receiving the turn-off signal, and correspondingly adjusts the driving signal of the other switching tube.
As a preferred embodiment, the comparison circuit is specifically a first comparator U1, one input terminal of the first comparator U1 is used as an input terminal of the comparison circuit, the other input terminal of the first comparator U1 inputs the voltage of the resonant capacitor or the sampling value thereof, and the output terminal of the first comparator U1 is connected with the input terminal of the switching tube driving circuit.
Further, the comparison circuit in the present application may select the first comparator U1, and the input end of the first comparator U1 has two connection modes: first, the input positive terminal of the first comparator U1 is used as an input terminal (input feedback voltage) of the comparison circuit, and the input negative terminal inputs the voltage of the resonant capacitor (the voltage of the resonant capacitor is not suitable for being input into the control circuit 1 when the voltage of the resonant capacitor is too high, and therefore, a sampling value of the voltage of the resonant capacitor is usually selected here), when the voltage of the resonant capacitor (or the sampling value thereof) rises to the feedback voltage, the output of the first comparator U1 is changed from high level to low level, namely, a turn-off signal is generated; the second, the negative input terminal of the first comparator U1 is used as the input terminal of the comparison circuit, the positive input terminal inputs the voltage (or sampling value) of the resonant capacitor, when the voltage of the resonant capacitor rises to the feedback voltage, the output of the first comparator U1 is changed from low level to high level, namely, a turn-off signal is generated.
As a preferred embodiment, the switching circuit 23 includes:
the detection end is used as a detection comparison circuit of the detection end of the switching circuit 23 and is used for detecting the output voltage of the resonant circuit 2, comparing the detected output voltage with a preset voltage, and generating a fast loop switching signal by the output end when the detected output voltage is not less than the preset voltage, otherwise, generating a slow loop switching signal;
the driving end is used as a switching driving circuit of the control end of the switching circuit 23, and is used for correspondingly driving the feedback regulating circuit 21 to switch to the fast loop or the slow loop when the fast loop switching signal or the slow loop switching signal is detected, so as to correspondingly accelerate or slow down the response speed.
Specifically, the switching circuit 23 includes a detection comparing circuit and a switching driving circuit, and first the detection comparing circuit detects the output voltage of the resonance circuit 2 and compares the detected output voltage with a set voltage, and generates a fast loop switching signal when the detected output voltage is not less than the set voltage; when the detected output voltage is smaller than the set voltage, generating a slow loop switching signal, and inputting a fast loop switching signal or a slow loop switching signal to a switching driving circuit; then, the switching driving circuit correspondingly drives the feedback regulating circuit 21 to switch to the fast loop or the slow loop after receiving the fast loop switching signal or the slow loop switching signal.
As a preferred embodiment, the detection end of the detection comparison circuit comprises a first detection end and a second detection end, the output end of the resonance circuit 2 comprises an output positive end and an output negative end, the first detection end of the detection comparison circuit is connected with the output positive end of the resonance circuit 2, the second detection end of the detection comparison circuit is connected with the output negative end of the resonance circuit 2, and the common end of the detection comparison circuit is grounded; the detection comparison circuit comprises a first voltage dividing resistor Rd1, a second voltage dividing resistor Rd2 and a second comparator U2, wherein:
the first end of the first voltage dividing resistor Rd1 is used as a first detection end of the detection comparison circuit, the second end of the first voltage dividing resistor Rd1 is respectively connected with the first end of the second voltage dividing resistor Rd2 and one of the input ends of the second comparator U2, the second end of the second voltage dividing resistor Rd2 is used as a second detection end of the detection comparison circuit, the other input end of the second comparator U2 inputs preset voltage, and the output end of the second comparator U2 is used as an output end of the detection comparison circuit.
Further, the detection and comparison circuit in the application comprises a first voltage dividing resistor Rd1, a second voltage dividing resistor Rd2 and a second comparator U2, wherein the first voltage dividing resistor Rd1 and the second voltage dividing resistor Rd2 are used for detecting the output voltage of the resonant circuit 2, and the signal obtained by voltage division is the detection signal of the output voltage; the input end of the second comparator U2 has two connection modes: first, the input positive terminal of the second comparator U2 inputs a detection signal, the input negative terminal inputs a set voltage (Vs in fig. 3 represents the set voltage), when the voltage of the detection signal is not less than the set voltage, the second comparator U2 outputs a high level, i.e. a fast loop switching signal, and otherwise outputs a low level, i.e. a slow loop switching signal; the second, the input positive terminal of the second comparator U2 inputs the set voltage, input negative terminal inputs the detection signal, when the voltage of the detection signal is not smaller than the set voltage, the second comparator U2 outputs the low level, namely the fast loop switching signal, otherwise, outputs the high level, namely the slow loop switching signal.
The application also provides a lighting device which comprises an LED device and further comprises any one of the LED driving circuits.
For the description of the lighting device provided by the present application, please refer to the above-mentioned driving circuit embodiment, and the description of the present application is omitted herein.
It should also be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a LED drive circuit which characterized in that includes control circuit and includes resonant capacitor and upper switch tube and lower switch tube that switch on in turn, is used for driving the resonant circuit that the emitting diode LED device shines, wherein, control circuit includes:
the feedback regulating circuit is used for detecting the output parameters of the resonant circuit, differencing the preset given reference parameters and the obtained detection parameters, and regulating the deviation through proportional integral to obtain feedback voltage;
the input end of the switching-off control circuit is connected with the output end of the feedback regulating circuit, and the switching-off control circuit is used for controlling any selected switching tube in the resonant circuit to be switched off and correspondingly regulating the driving signal of the other switching tube when the voltage of the resonant capacitor rises to the feedback voltage;
and the switching circuit is used for controlling the feedback regulating circuit to switch to a fast loop so as to accelerate the response speed of the feedback regulating circuit when the detected output voltage of the resonant circuit is not less than a preset voltage, and otherwise, switching to a slow loop.
2. The LED driving circuit according to claim 1, wherein the detected output parameter of the resonant circuit is in particular an output current.
3. The LED driver circuit of claim 2, wherein the output terminals of the resonant circuit include an output positive terminal and an output negative terminal; the feedback regulation circuit comprises a sampling resistor, an input resistor, an operational amplifier and a loop circuit, wherein:
the first end of the sampling resistor is connected with the output negative end of the resonant circuit, the common end of the sampling resistor is grounded, the second end of the sampling resistor is respectively connected with the input negative end of the LED device and the first end of the input resistor, the second end of the input resistor is respectively connected with the input negative end of the operational amplifier and the first end of the loop circuit, the input positive end of the operational amplifier inputs the given reference parameter, the output end of the operational amplifier is connected with the second end of the loop circuit, the common end of the operational amplifier is used as the output end of the feedback regulating circuit, and the switching end of the loop circuit is used as the switching end of the feedback regulating circuit;
the switching circuit is specifically configured to increase the equivalent resistance value of the loop circuit or decrease the equivalent capacitance value of the loop circuit when the detected output voltage of the resonant circuit is not less than a preset voltage, so as to control the feedback adjustment circuit to switch to the fast loop, and vice versa.
4. The LED driving circuit of claim 3, wherein the loop circuit comprises a first switching tube, a first resistor, a second resistor, a third resistor, and a first capacitor, wherein:
the first end of the first switch tube is respectively connected with the first end of the second resistor and the first end of the third resistor, the common end of the first switch tube is used as the first end of the loop circuit, the second end of the third resistor is connected with the first end of the first capacitor, the second end of the first switch tube is connected with the first end of the first resistor, the second end of the first resistor is respectively connected with the second end of the second resistor and the second end of the first capacitor, the common end of the first switch tube is used as the second end of the loop circuit, and the control end of the first switch tube is used as the switching end of the loop circuit.
5. The LED driving circuit of claim 3, wherein the loop circuit comprises a second switching tube, a fourth resistor, a fifth resistor, and a second capacitor, wherein:
the first end of the second switch tube is connected with the first end of the fifth resistor, the common end of the second switch tube is used as the first end of the loop circuit, the second end of the second switch tube is connected with the first end of the fourth resistor, the second end of the fourth resistor is respectively connected with the second end of the fifth resistor and the first end of the second capacitor, the second end of the second capacitor is used as the second end of the loop circuit, and the control end of the second switch tube is used as the switching end of the loop circuit.
6. The LED driving circuit according to claim 1, wherein the off control circuit includes:
the input end is used as the comparison circuit of the input end of the turn-off control circuit and is used for comparing the voltage of the resonance capacitor with the feedback voltage, and when the voltage of the resonance capacitor rises to the feedback voltage, a turn-off signal is generated;
and the switching tube driving circuit is used for controlling the selected switching tube to be turned off when the turn-off signal is detected, and correspondingly adjusting the driving signal of the other switching tube.
7. The LED driving circuit according to claim 6, wherein the comparing circuit is specifically a first comparator, one of the input terminals of the first comparator is used as the input terminal of the comparing circuit, the other input terminal of the first comparator inputs the voltage of the resonant capacitor or the sampling value thereof, and the output terminal of the first comparator is connected with the input terminal of the switching tube driving circuit.
8. The LED driving circuit according to any one of claims 1 to 7, wherein the switching circuit includes:
the detection end is used as a detection comparison circuit of the detection end of the switching circuit and is used for detecting the output voltage of the resonant circuit, comparing the detected output voltage with a preset voltage, and generating a fast loop switching signal by the output end when the detected output voltage is not smaller than the preset voltage, otherwise, generating a slow loop switching signal;
and the driving end is used as a switching driving circuit of the control end of the switching circuit and is used for correspondingly driving the feedback regulating circuit to switch to a fast loop or a slow loop when the fast loop switching signal or the slow loop switching signal is detected so as to correspondingly accelerate or slow down the response speed.
9. The LED driving circuit of claim 8, wherein the detection terminals of the detection comparison circuit comprise a first detection terminal and a second detection terminal, the output terminal of the resonant circuit comprises an output positive terminal and an output negative terminal, the first detection terminal of the detection comparison circuit is connected to the output positive terminal of the resonant circuit, the second detection terminal of the detection comparison circuit is connected to the output negative terminal of the resonant circuit, and the common terminal is grounded; the detection comparison circuit comprises a first voltage dividing resistor, a second voltage dividing resistor and a second comparator, wherein:
the first end of the first voltage dividing resistor is used as a first detection end of the detection comparison circuit, the second end of the first voltage dividing resistor is respectively connected with the first end of the second voltage dividing resistor and one of the input ends of the second comparator, the second end of the second voltage dividing resistor is used as a second detection end of the detection comparison circuit, the other input end of the second comparator inputs the preset voltage, and the output end of the second comparator is used as an output end of the detection comparison circuit.
10. A lighting device comprising an LED arrangement, further comprising an LED driving circuit according to any one of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810644245.6A CN108770124B (en) | 2018-06-21 | 2018-06-21 | LED drive circuit and lighting equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810644245.6A CN108770124B (en) | 2018-06-21 | 2018-06-21 | LED drive circuit and lighting equipment |
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| CN108770124B true CN108770124B (en) | 2023-08-18 |
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| CN1909351A (en) * | 2006-06-30 | 2007-02-07 | 艾默生网络能源有限公司 | Feedback circuit adapted for series resonance dc-dc converter |
| CN104143920A (en) * | 2013-05-10 | 2014-11-12 | 国钰电子(北海)有限公司 | Resonant transformation circuit |
| WO2016000259A1 (en) * | 2014-07-04 | 2016-01-07 | 深圳欧陆通电子有限公司 | Power supply |
| CN208490012U (en) * | 2018-06-21 | 2019-02-12 | 英飞特电子（杭州）股份有限公司 | A kind of LED drive circuit and lighting apparatus |
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| US8779680B2 (en) * | 2006-11-26 | 2014-07-15 | Tritonics Technologies Ltd | Enabling simultaneous dimming and power supply operations within a dimmer assembly through a single pair of electrical wires |
| US9331565B2 (en) * | 2010-07-14 | 2016-05-03 | Delta Electronics (Shanghai) Co., Ltd. | Switching power conversion circuit and power supply using same |
| EP2477456B1 (en) * | 2011-01-14 | 2016-04-06 | Ontopx LED GmbH | Drive circuit for light-emitting diode array |
| US20140103962A1 (en) * | 2012-10-11 | 2014-04-17 | Sl3J Systems S.A.R.L. | High-speed gate driver for power switches with reduced voltage ringing |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1909351A (en) * | 2006-06-30 | 2007-02-07 | 艾默生网络能源有限公司 | Feedback circuit adapted for series resonance dc-dc converter |
| CN104143920A (en) * | 2013-05-10 | 2014-11-12 | 国钰电子(北海)有限公司 | Resonant transformation circuit |
| WO2016000259A1 (en) * | 2014-07-04 | 2016-01-07 | 深圳欧陆通电子有限公司 | Power supply |
| CN208490012U (en) * | 2018-06-21 | 2019-02-12 | 英飞特电子（杭州）股份有限公司 | A kind of LED drive circuit and lighting apparatus |
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Denomination of invention: A LED driver circuit and lighting equipment Granted publication date: 20230818 Pledgee: Industrial and Commercial Bank of China Limited Hangzhou Qianjiang Branch Pledgor: INVENTRONICS (HANGZHOU), Inc. Registration number: Y2024330000378 |