CN114040543B - LED linear driving circuit - Google Patents
LED linear driving circuit Download PDFInfo
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- CN114040543B CN114040543B CN202110820591.7A CN202110820591A CN114040543B CN 114040543 B CN114040543 B CN 114040543B CN 202110820591 A CN202110820591 A CN 202110820591A CN 114040543 B CN114040543 B CN 114040543B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/36—Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
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Abstract
The invention provides an LED linear driving circuit, which is characterized in that an input voltage is obtained after alternating current input is subjected to a rectifying circuit, the LED linear driving circuit comprises a first capacitor and a current adjusting circuit, the input voltage is input to the first capacitor, and the voltage of the first capacitor is supplied to an LED load; the current adjusting circuit is connected with the first capacitor to restrain peak current generated in the discharging process of the first capacitor. The LED linear driving circuit can inhibit peak current generated in the discharging process of the first capacitor, has high integration level, reduces system cost and light absorption caused by devices, and reduces the light passing level requirement on a light source.
Description
Technical Field
The invention relates to the field of power electronics, in particular to an LED linear driving circuit.
Background
The existing LED control chip linear products are DOB (Driver-On-Board) architecture, namely, a light source and a Driver are placed On an aluminum substrate, so that high requirements are put On the high integration level of the chip; in the existing integrated circuit driven by the LED, too many peripheral devices cannot be integrated in the LED driving chip, so that light absorption can be caused, the luminous flux of the whole lamp is low, and higher requirements on a light source are required.
Disclosure of Invention
The invention aims to provide an LED linear driving circuit with improved integration level, which is used for solving the problems of excessive peripheral devices, high cost and low luminous flux of the whole lamp in the prior art.
In order to achieve the above object, the present invention provides an LED linear driving circuit, in which an ac input is rectified to obtain an input voltage, comprising:
the first regulating circuit is used for receiving the input voltage and supplying the input voltage to an LED load after regulating the input voltage;
a first capacitor to which the input voltage is input, the voltage of the first capacitor being supplied to the LED load;
the second regulating circuit is connected with the first capacitor in series and then connected with the first regulating circuit in parallel;
and the current adjusting circuit is connected with the first capacitor to inhibit peak current generated in the discharging process of the first capacitor.
Optionally, the current adjusting circuit is configured to reduce a negative current flowing to the rectifying circuit during the discharging process of the first capacitor.
Optionally, the rectifying circuit includes four diodes, at least two of the four diodes are fast recovery diodes, and the fast recovery diodes serve as the current adjusting circuit.
Optionally, each of the four diodes is a fast recovery diode.
Optionally, two diodes among the four diodes are fast recovery diodes; the anodes of the two fast recovery diodes are connected with each other, or the cathodes of the two fast recovery diodes are connected with each other.
Optionally, the recovery time of the fast recovery diode is greater than zero and less than 1us.
Optionally, the recovery time of the fast recovery diode is greater than zero and less than 500ns.
Optionally, the LED linear driving circuit further includes:
the reference voltage generating circuit receives the input voltage and outputs a first reference voltage and a second reference voltage;
the first regulating circuit receives the first reference voltage to regulate the LED load current according to the first reference voltage;
the second regulating circuit receives the second reference voltage to regulate the current of the LED load according to the second reference voltage;
the first regulating circuit operates when the input voltage is greater than a first voltage and less than a second voltage, and the second regulating circuit operates when the input voltage is greater than a second voltage.
Optionally, the circuit further comprises a first diode, wherein the anode of the first diode is connected with the first capacitor, and the cathode of the first diode is connected with the second regulating circuit.
Optionally, the current adjusting circuit includes a first resistor and a first switch, where the first resistor and the first switch are connected in series and then connected in parallel with the first capacitor, and when the input voltage is greater than the first voltage and less than the second voltage, the first switch is turned on.
Optionally, the system further comprises a second diode, wherein the anode of the second diode is connected with the system ground, and the cathode of the second diode is connected with the first capacitor and the intermediate node of the first diode.
Optionally, the current regulation circuit further comprises a second diode, the anode of the second diode is connected with the first end of the second resistor, the second end of the second resistor is connected with the system ground, and the cathode of the second diode is connected with the first capacitor and the intermediate node of the first diode.
Optionally, the current adjusting circuit includes a second diode, the cathode of the second diode is connected to the first capacitor, and when the input voltage is greater than the first voltage and less than the second voltage, the anode of the second diode is connected to the middle of the LED load; when the input voltage is greater than the second voltage, the second diode anode is connected to system ground.
Optionally, the first adjusting circuit includes a first adjusting tube, a first operational amplifier and a first sampling resistor, and the first adjusting tube and the first sampling resistor are connected in series; the first operational amplifier first input end receives the first reference voltage, the first operational amplifier second end is connected with the common connection end of the first adjusting tube and the first sampling resistor, and the first operational amplifier output end is connected with the control end of the first adjusting tube.
Optionally, the second adjusting circuit includes a second adjusting tube, a second operational amplifier and a second sampling resistor, the second adjusting tube and the second sampling resistor are sequentially connected in series, the first input end of the second operational amplifier receives the second reference voltage, the second end of the second operational amplifier is connected with the common connection end of the second adjusting tube and the second sampling resistor, and the output end of the second operational amplifier is connected with the control end of the second adjusting tube.
Optionally, the rectifying circuit is integrated within the LED linear driving circuit chip.
Compared with the prior art, the invention has the following advantages: the LED linear driving circuit is connected with the first capacitor through the current adjusting circuit, so that peak current generated in the discharging process of the first capacitor is restrained. The LED linear driving circuit can inhibit peak current generated in the discharging process of the first capacitor, has high integration level, reduces system cost and light absorption caused by devices, and reduces the light flux level of a light source.
Drawings
FIG. 1 is a schematic diagram of an embodiment of an LED linear driving circuit according to the present invention;
FIG. 2 is a schematic diagram of a linear driving circuit for LEDs according to a second embodiment of the invention;
FIG. 3 is a schematic diagram of a linear driving circuit of an LED according to a third embodiment of the present invention;
FIG. 4 is a fourth schematic diagram of an embodiment of the LED linear driving circuit of the present invention;
FIG. 5 is a schematic diagram of a first adjustment circuit of the LED linear driving circuit of the present invention;
FIG. 6 is a schematic diagram of a second regulation circuit of the LED linear driving circuit of the present invention;
fig. 7 is a diagram of an integrated peripheral device of the LED linear driving circuit of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments only. The invention is intended to cover any alternatives, modifications, equivalents, and variations that fall within the spirit and scope of the invention.
In the following description of preferred embodiments of the invention, specific details are set forth in order to provide a thorough understanding of the invention, and the invention will be fully understood to those skilled in the art without such details.
The invention is more particularly described by way of example in the following paragraphs with reference to the drawings. It should be noted that the drawings are in a simplified form and are not to scale in order to facilitate a clear and concise description of embodiments of the present inventions.
Although the embodiments have been described and illustrated separately above, and with respect to a partially common technique, it will be apparent to those skilled in the art that alternate and integration may be made between embodiments, with reference to one embodiment not explicitly described, and reference may be made to another embodiment described.
Fig. 1 illustrates a block diagram of an embodiment of an LED linear driving circuit according to the present invention, an ac power supply obtains an input voltage VIN through a rectifying circuit, the control circuit includes a reference voltage generating circuit U00, a first adjusting circuit U01, a second adjusting circuit U02, a first capacitor C01, a first diode D01 and a second diode D02, the input voltage obtains a divided voltage V1 through a dividing resistor R1 and a resistor R2, and the reference voltage generating circuit U01 receives the divided voltage V1 and outputs a first reference voltage VREF1 and a second reference voltage VREF2. The first end of the first regulating circuit U01 is connected with the output end of the rectifying circuit, the second end of the first regulating circuit U01 is connected with the LED load, and the control end of the first regulating circuit U01 receives the first reference voltage VREF1. The second adjusting circuit U02, the first capacitor C01 and the first diode D01 are connected in series and then connected in parallel with the first adjusting circuit U01, wherein the first diode D01 is connected in series between the second adjusting circuit U02 and the first capacitor C01. The control end of the second adjusting circuit U02 receives the second reference voltage VREF2. The first diode D01 is connected in series to the branch of the second adjusting circuit U02, so as to avoid that a current portion flowing out of the first adjusting circuit flows into the second adjusting circuit when the first adjusting circuit U01 is turned on, thereby affecting the LED load current. And the anode of the second diode D02 is connected with the second regulating circuit U02, and the cathode of the second diode D02 is connected with the system ground.
When the divided voltage V1 is larger than the first voltage and smaller than the second voltage, the first regulating circuit U01 is conducted, the first capacitor C01 discharges, a discharge loop is formed through the first regulating circuit, the LED load, the system ground and the second diode D02, and the first regulating circuit U01 is controlled to conduct current according to the first reference voltage VREF 1; when the divided voltage V1 is greater than the second voltage, the first adjusting circuit U01 is turned off, the second adjusting circuit U02 is turned on, the input voltage charges the first capacitor C01, and at the same time, the second adjusting circuit U02 is controlled to turn on current according to the second reference voltage VREF2. The first voltage represents a voltage when the input voltage VIN reaches a sum of the load voltage VDF and the conduction voltage drop of the first regulating circuit U01, the divided voltage V1 is greater than the first voltage and smaller than the second voltage, the divided voltage V1 is greater than the second voltage, the input voltage VIN is corresponding to the low voltage, and the divided voltage V1 is greater than the second voltage, and the input voltage VIN is corresponding to the high voltage.
A diode is usually connected in series to the bus to avoid the problem of bus current reverse oscillation when the second regulating circuit U02 discharges. However, the four diodes in the rectifying circuit can adopt fast recovery diodes, or the two diodes FRD1 and FRD2 connected with the anodes adopt fast recovery diodes, or the two diodes FRD3 and FRD4 connected with the cathodes adopt fast recovery diodes, and the diodes are not required to be connected in series on the bus, so that the problem of bus current reverse oscillation is solved; if one bridge arm in the whole circuit adopts a common diode, the parasitic capacitance of the common diode is larger, and the first capacitor C01 can be discharged to the ground from the parasitic capacitance of the bridge arm diode, so that bus current reverse oscillation is caused. The reverse recovery time of the adopted fast recovery diode is generally more than 0 and less than 1us, the reverse recovery time of some fast recovery diodes is also faster and generally more than 0 and less than 500ns, the reverse recovery time of the ultra-fast recovery diode can even reach tens of nanoseconds, the voltage peak and electromagnetic interference caused by the fast recovery diode can be reduced by adopting the fast recovery diode, so that an absorption circuit is reduced or even removed as much as possible, and the problem of larger bus current reverse oscillation can be caused by adopting a common diode with lower cost in a rectifying circuit.
Fig. 2, 3 and 4 respectively illustrate schematic diagrams of three other embodiments of the LED linear driving circuit, which are all used to suppress the reverse oscillation of the bus current during the discharging process of the first capacitor C01. In fig. 2, in the process of switching from the high-voltage input section to the low-voltage input section, a resistor R3 is connected in parallel to both ends of a first capacitor C01. In fig. 3, in the process of switching the input voltage from a high-voltage section to a low-voltage section, the switch K1 is turned on, and the anode of the second diode D02 is connected to the middle of the LED load lamp bead, so as to reduce the voltage drop change of the cathode of the first capacitor C01, and thus reduce the bus current reverse oscillation; at the high-voltage stage, the switch K2 is turned on, and the positive electrode of the second diode D02 is connected to the system ground. In fig. 4, in the process of switching the input voltage from the high voltage section to the low voltage section, a resistor R4 is connected in series to the second diode D02, so that the bus current reverse oscillation can be reduced.
FIG. 5 is a schematic diagram of a first adjusting circuit of the present invention, including a first adjusting tube M101, a first operational amplifier U101, and a first sampling resistor R S1 The first end of the first adjusting tube M101 is connected with the bus terminal, and the second end thereof passes through the first sampling resistor R S1 The first input end of the first operational amplifier U101 receives a first reference voltage VREF1, the second end of the first operational amplifier U101 is connected with the second end of the first adjusting tube M101, and the output end of the first operational amplifier U101 is connected with the output end of the first adjusting tube M101. When the divided voltage is greater than the first voltage and smaller than the second voltage, the first adjusting tube M101 is turned on, and the first reference voltage VREF1 controls the on current of the first adjusting tube M101.
FIG. 6 is a schematic diagram of a second regulating circuit of the present invention, including a first capacitor C01, a second regulating tube M201, a second operational amplifier U201 and a first sampling resistor R S2 A second adjusting tube M201 and a first sampling resistor R S2 The first input end of the second operational amplifier U201 receives the second reference voltage VREF2, the second input end thereof is connected to the source electrode of the second adjusting tube M102, and the output end thereof is connected. When the divided voltage is greater than the second voltage, the second adjusting tube M201 is turned on, and the second reference voltage VREF2 controls the on current of the second adjusting tube M201.
Fig. 7 illustrates a diagram of a peripheral device after the LED linear driving circuit of the present invention is integrated, in which the first capacitor C01, the first sampling resistor RS1, and the second sampling resistor RS2 are disposed off-chip, and the rectifying circuit and other LED linear driving circuits are disposed inside the chip. The common connection end of the first sampling resistor RS1 and the second sampling resistor RS2 and the LED load is set as the reference ground end of the chip. Compared with the prior art, the LED linear driving circuit has the advantages of fewer peripheral devices, low cost and fewer light absorption of the peripheral devices after being integrated.
The above-described embodiments do not limit the scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the above embodiments should be included in the scope of the present invention.
Claims (15)
1. An LED linear driving circuit, in which an ac input is rectified to obtain an input voltage, comprising:
the first regulating circuit is used for receiving the input voltage and supplying the input voltage to an LED load after regulating the input voltage;
a first capacitor to which the input voltage is input, the voltage of the first capacitor being supplied to the LED load;
the second regulating circuit is connected with the first capacitor in series and then connected with the first regulating circuit in parallel;
the current adjusting circuit is connected with the first capacitor to inhibit peak current generated in the discharging process of the first capacitor; the current adjusting circuit is used for reducing negative current flowing to the rectifying circuit in the discharging process of the first capacitor.
2. The LED linear driving circuit according to claim 1, wherein: the rectifying circuit comprises four diodes, at least two of the four diodes are fast recovery diodes, and the fast recovery diodes serve as the current adjusting circuit.
3. The LED linear driving circuit according to claim 2, wherein: the four diodes are all fast recovery diodes.
4. The LED linear driving circuit according to claim 2, wherein: of the four diodes, two diodes are fast recovery diodes; the anodes of the two fast recovery diodes are connected with each other, or the cathodes of the two fast recovery diodes are connected with each other.
5. The LED linear driving circuit according to any one of claims 2, 3 or 4, wherein: the recovery time of the fast recovery diode is more than zero and less than 1us.
6. The LED linear driving circuit according to any one of claims 2, 3 or 4, wherein: the recovery time of the fast recovery diode is more than zero and less than 500ns.
7. The LED linear driving circuit according to claim 1, wherein: and also comprises
The reference voltage generating circuit receives the input voltage and outputs a first reference voltage and a second reference voltage;
the first regulating circuit receives the first reference voltage to regulate the LED load current according to the first reference voltage;
the second regulating circuit receives the second reference voltage to regulate the current of the LED load according to the second reference voltage;
the first regulating circuit operates when the input voltage is greater than a first voltage and less than a second voltage, and the second regulating circuit operates when the input voltage is greater than a second voltage.
8. The LED linear driving circuit of claim 7, wherein: the circuit further comprises a first diode, wherein the anode of the first diode is connected with the first capacitor, and the cathode of the first diode is connected with the second regulating circuit.
9. The LED linear driving circuit of claim 7, wherein: the current adjusting circuit comprises a first resistor and a first switch, wherein the first resistor and the first switch are connected in series and then connected with the first capacitor in parallel, and when the input voltage is larger than the first voltage and smaller than the second voltage, the first switch is conducted.
10. The LED linear driving circuit of claim 8, wherein: the second diode is connected with the system ground at the anode, and the second diode is connected with the first capacitor and the intermediate node of the first diode at the cathode.
11. The LED linear driving circuit of claim 8, wherein: the current regulation circuit further comprises a second resistor, the anode of the second resistor is connected with the first end of the second resistor, the second end of the second resistor is connected with the system ground, and the cathode of the second diode is connected with the first capacitor and the middle node of the first diode.
12. The LED linear driving circuit of claim 7, wherein: the current adjusting circuit comprises a second diode, the cathode of the second diode is connected with the first capacitor, and when the input voltage is larger than the first voltage and smaller than the second voltage, the anode of the second diode is connected with the middle of the LED load; when the input voltage is greater than the second voltage, the second diode anode is connected to system ground.
13. The LED linear driving circuit of claim 7, wherein: the first adjusting circuit comprises a first adjusting tube, a first operational amplifier and a first sampling resistor, and the first adjusting tube and the first sampling resistor are connected in series; the first operational amplifier first input end receives the first reference voltage, the first operational amplifier second end is connected with the common connection end of the first adjusting tube and the first sampling resistor, and the first operational amplifier output end is connected with the control end of the first adjusting tube.
14. The LED linear driving circuit of claim 7, wherein: the second adjusting circuit comprises a second adjusting tube, a second operational amplifier and a second sampling resistor, the second adjusting tube and the second sampling resistor are sequentially connected in series, a first input end of the second operational amplifier receives the second reference voltage, a second end of the second operational amplifier is connected with a common connecting end of the second adjusting tube and the second sampling resistor, and an output end of the second operational amplifier is connected with a control end of the second adjusting tube.
15. The LED linear driving circuit according to any one of claims 2, 3, 4, wherein: the rectification circuit is integrated in the LED linear driving circuit chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110820591.7A CN114040543B (en) | 2021-07-20 | 2021-07-20 | LED linear driving circuit |
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| CN202110820591.7A CN114040543B (en) | 2021-07-20 | 2021-07-20 | LED linear driving circuit |
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| CN114040543B true CN114040543B (en) | 2023-08-29 |
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| CN114040543A (en) | 2022-02-11 |
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