CN210609796U - LED drive circuit - Google Patents
LED drive circuit Download PDFInfo
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- CN210609796U CN210609796U CN201920858921.XU CN201920858921U CN210609796U CN 210609796 U CN210609796 U CN 210609796U CN 201920858921 U CN201920858921 U CN 201920858921U CN 210609796 U CN210609796 U CN 210609796U
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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]
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Abstract
The utility model discloses a LED drive circuit, which adopts a master control chip to comprehensively control an MOS tube, each capacitor, each resistor and each diode, can realize the drive control of the LED, compared with the traditional technology, an active device is not used in the circuit, the whole circuit structure is simpler, and the manufacturing cost is lower; particularly, the third capacitor and the twelfth resistor which are connected in parallel are adopted to protect the source electrode and the drain electrode of the MOS tube, so that the interference voltage introduced into the MOS tube can be isolated, and the overall working stability of the circuit is improved. Therefore, the utility model has the advantages of simple structure, low cost, safety, reliability, etc.
Description
Technical Field
The utility model belongs to the technical field of the LED drive and specifically relates to a LED drive circuit.
Background
The LED lamp is a high-brightness white light-emitting diode light-emitting source, has the characteristics of high luminous efficiency, low power consumption, long service life, easy control, maintenance-free, safety and environmental protection, is a new generation of solid cold light source with excellent performance, and needs to be controlled by a special driving circuit. The traditional LED drive circuit has more components, particularly a large number of active components, and although the performance of the drive circuit can be improved, the circuit structure is more complex and the cost is higher, and the traditional LED drive circuit lacks corresponding circuit protection function, so that the safety and reliability of the circuit are not high.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, the present invention provides a LED driving circuit with simple structure, low cost, safety and reliability.
In order to compensate the deficiency of the prior art, the embodiment of the utility model provides an adopt technical scheme is:
an LED driver circuit comprising:
an IC control circuit for driving and controlling the LED; the IC control circuit comprises a main control chip, an MOS (metal oxide semiconductor) tube, a second capacitor, a third capacitor, a fourth capacitor, a first diode, a second diode, a first grounding resistor, a second grounding resistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor and a fourteenth resistor;
a current sensing pin of the main control chip is connected to a cathode of the first diode through the fifth resistor, the fourth resistor, the sixth resistor, the seventh resistor and the eighth resistor which are connected in sequence, and is also connected to a source of the MOS tube and the first grounding resistor and the second grounding resistor which are grounded in parallel through the first resistor; a power supply voltage end is arranged at the connection position between the seventh resistor and the eighth resistor;
a power tube driving pin of the main control chip is connected to one end of the third resistor, and the other end of the third resistor is connected to the grid electrode of the MOS tube and is also connected to the source electrode of the MOS tube through the second resistor;
a feedback voltage pin of the main control chip is connected to the anode of the first diode through the thirteenth resistor and is also connected to a reference ground through the second capacitor and the fourteenth resistor which are connected in parallel;
the third capacitor and the twelfth resistor are connected between the drain electrode and the source electrode of the MOS tube in parallel; the drain of the MOS tube is connected to the anode of the second diode, and the cathode of the second diode is connected to the fourth capacitor and the eleventh resistor which are connected in parallel through the ninth resistor and the tenth resistor which are connected in parallel.
Furthermore, the IC control circuit further comprises a first capacitor and an electrolytic capacitor, the internal error output pin of the main control chip is connected to the reference ground through the first capacitor, and the power supply pin of the main control chip is connected to the reference ground through the electrolytic capacitor.
Furthermore, the technical solution further includes a power conversion circuit for converting an output current of the IC control circuit into a required operating current, wherein an input end of the power conversion circuit is respectively connected to the fourth capacitor, the eleventh resistor, the anode of the first diode, and the anode of the second diode.
Further, the power conversion circuit comprises a transformer, a fifth capacitor, a sixth capacitor, a seventh capacitor, a third diode, a fourth diode, a fifteenth resistor and a sixteenth resistor;
the positive pole of the first primary coil of the transformer is connected to the fourth capacitor and the eleventh resistor respectively and is also connected to digital ground through the sixth capacitor; the cathode of the first primary coil of the transformer is connected to the anode of the second diode;
the anode of the second primary coil of the transformer is connected to the cathode of the first diode, and the cathode of the second primary coil of the transformer is connected to the reference ground;
the anode of the secondary coil of the transformer is connected to the seventh capacitor, the anode of the third diode and the anode of the fourth diode respectively, the third diode and the fourth diode are connected in parallel, the fifteenth resistor and the sixteenth resistor are connected in parallel, and the seventh capacitor is arranged between the sixteenth resistor and the anode of the third diode;
the cathode of the secondary coil of the transformer is connected to digital ground;
the fifth capacitor is arranged between the negative electrode of the second primary coil and the negative electrode of the secondary coil of the transformer.
Further, the main control chip adopts an MT7932 chip.
The embodiment of the utility model provides an in one or more technical scheme, following beneficial effect has at least: the main control chip is adopted for overall control, under the coordination of each resistor and each capacitor, the driving control of the LED can be realized based on the MOS tube, active devices are not used in the circuit, the whole circuit structure is simpler, and the manufacturing cost is lower; particularly, the third capacitor and the twelfth resistor which are connected in parallel are adopted to protect the source electrode and the drain electrode of the MOS tube, so that the interference voltage introduced into the MOS tube can be isolated, and the overall working stability of the circuit is improved. Therefore, the utility model has the advantages of simple structure, low cost, safety, reliability, etc.
Drawings
The following description of the preferred embodiments of the present invention will be made with reference to the accompanying drawings.
Fig. 1 is a schematic circuit diagram of an LED driving circuit according to an embodiment of the present invention.
Detailed Description
This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.
The embodiments of the present invention will be further explained with reference to the drawings.
Referring to fig. 1, an embodiment of the present invention provides a LED driving circuit, including: an IC control circuit 100 for drive-controlling the LEDs; the IC control circuit 100 comprises a main control chip U1, a MOS transistor Q1, a second capacitor C5, a third capacitor C3, a fourth capacitor C2, a first diode D1, a second diode D3, a first grounding resistor RA, a second grounding resistor RB, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13 and a fourteenth resistor R14;
a current sensing pin CS of the main control chip U1 is connected to a cathode of the first diode D1 through the fifth resistor R5, the fourth resistor R4, the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 which are connected in sequence, and is also connected to a source of the MOS transistor Q1 and the first ground resistor RA and the second ground resistor RB which are connected to ground in parallel through the first resistor R1; a power supply voltage end VCC is arranged at the connection position between the seventh resistor R7 and the eighth resistor R8;
a power tube driving pin DRV of the master chip U1 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is connected to the gate of the MOS tube Q1 and is also connected to the source of the MOS tube Q1 through the second resistor R2;
a feedback voltage pin DSEN of the main control chip U1 is connected to the positive electrode of the first diode D1 through the thirteenth resistor R13, and is also connected to the reference ground through the second capacitor C5 and the fourteenth resistor R14 connected in parallel;
the third capacitor C3 and the twelfth resistor R12 are connected between the drain and the source of the MOS transistor Q1 in parallel; the drain of the MOS transistor Q1 is connected to the anode of the second diode D3, and the cathode of the second diode D3 is connected to the fourth capacitor C2 and the eleventh resistor R11 connected in parallel through the ninth resistor R9 and the tenth resistor R10 connected in parallel.
In this embodiment, generally, an LED is connected to an output terminal of the circuit, a main control chip U1 is adopted for overall control, and under the coordination of each resistor and each capacitor, driving control over the LED can be realized based on the on or off of the MOS transistor Q1, that is, the current of the MOS transistor Q1 is mainly controlled through a power transistor driving pin DRV of the main control chip U1, so that the on or off of the MOS transistor is realized, and thus the LED is driven correspondingly, an active device is not used in the circuit, the overall circuit structure is simpler, and the manufacturing cost is lower; particularly, the third capacitor C3 and the twelfth resistor R12 which are connected in parallel are used for protecting the source electrode and the drain electrode of the MOS transistor Q1, so that the interference voltage introduced into the MOS transistor Q1 can be isolated, and the overall working stability of the circuit is improved. Therefore, the utility model has the advantages of simple structure, low cost, safety, reliability, etc.
Specifically, the first resistor R1, in cooperation with the first grounding resistor RA and the second grounding resistor RB, can stably ground the induced current and prevent crosstalk from being formed between the induced current and the MOS transistor Q1; the third resistor R3 and the second resistor R2 are both connected to the power transistor driving pin DRV of the main control chip U1, and can respectively provide bias voltages for the gate and the source of the MOS transistor Q1; the second capacitor C5 and the fourteenth resistor R14 cooperate to play a role of stabilizing filtering, the thirteenth resistor R13 plays a role of outputting voltage, preferably, a winding set or an inductor may be disposed behind the thirteenth resistor R13 to induce the output voltage, and further feed the output voltage back to the feedback voltage pin DSEN of the main control chip U1, so as to implement feedback, and the driving of the LED may be more accurately controlled through the feedback; the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 play a role in voltage division and current limitation, and can be matched with the cathode of the first diode D1 to provide on-state voltage; the ninth resistor R9, the tenth resistor R10, the eleventh resistor R11 and the fourth capacitor C2 may be matched to provide an input voltage to the second diode D3, so that normal conduction can be achieved; the supply voltage terminal VCC serves as an external power supply and may provide external voltage support for various passive devices in the IC control circuit 100.
It should be noted that the LED driving circuit of the present embodiment is mainly improved by the IC control circuit 100, and actually includes not only the IC control circuit 100 but also a peripheral circuit (such as an amplification output circuit) matched with the IC control circuit 100, and since the peripheral circuit is the prior art in the field, it is not described herein again.
Further, another embodiment of the present invention further provides an LED driving circuit, wherein the IC control circuit 100 further includes a first capacitor C6 and an electrolytic capacitor EC1, the internal error output pin COMP of the main control chip U1 is connected to the reference ground through the first capacitor C6, and the power supply pin VDD of the main control chip U1 is connected to the reference ground through the electrolytic capacitor EC 1.
In this embodiment, the first capacitor C6 connected to ground can implement frequency compensation of internal error output, and similarly, the electrolytic capacitor EC1 can perform frequency compensation for power error output, thereby ensuring internal stability of the main control chip U1.
Further, another embodiment of the present invention further provides an LED driving circuit, wherein the present embodiment further includes a power conversion circuit 200 for converting the output current of the IC control circuit 100 into the required operating current, and the input end of the power conversion circuit 200 is respectively connected to the fourth capacitor C2, the eleventh resistor R11, the anode of the first diode D1 and the anode of the second diode D3.
In this embodiment, the power conversion circuit 200 can conveniently convert the output current into an applicable current matched with the LED, so that the corresponding LED can be stably driven in a matching manner, a good driving effect is ensured, and specific parameters can be set by a manufacturer.
Further, another embodiment of the present invention further provides an LED driving circuit, wherein the power conversion circuit 200 includes a transformer T1, a fifth capacitor CY2, a sixth capacitor CY1, a seventh capacitor C7, a third diode D4, a fourth diode D5, a fifteenth resistor R22, and a sixteenth resistor R21;
the positive electrode of the first primary winding S1 of the transformer T1 is connected to the fourth capacitor C2 and the eleventh resistor R11, respectively, and is also connected to digital ground through the sixth capacitor CY 1; the cathode of the first primary coil S1 of the transformer T1 is connected to the anode of the second diode D3;
the anode of the second primary winding S2 of the transformer T1 is connected to the cathode of the first diode D1, and the cathode of the second primary winding S2 of the transformer T1 is connected to the reference ground;
an anode of the secondary winding S3 of the transformer T1 is connected to the seventh capacitor C7, an anode of the third diode D4, and an anode of the fourth diode D5, respectively, the third diode D4 and the fourth diode D5 are connected in parallel, the fifteenth resistor R22 and the sixteenth resistor R21 are connected in parallel, and the seventh capacitor C7 is disposed between the sixteenth resistor R21 and the anode of the third diode D4;
the cathode of the secondary winding S3 of the transformer T1 is connected to digital ground;
the fifth capacitor CY2 is disposed between the negative terminal of the second primary winding S2 and the negative terminal of the secondary winding S3 of the transformer T1.
In this embodiment, a transformer T1, a third diode D4 and a fourth diode D5 are adopted, the third diode D4 and the fourth diode D5 are arranged at the secondary end of the transformer T1, conversion parameters are provided through a feedback voltage pin DSEN of a main control chip U1, and output power can be converted into required working voltage and current by matching with the third diode D4 and the fourth diode D5; the fifth capacitor CY2 plays a role in preventing crosstalk generated inside the transformer T1, the sixth capacitor CY1 is used for filtering, the seventh capacitor C7 is used for isolating alternating current components in the output current, and the fifteenth resistor R22 and the sixteenth resistor R21 play a role in providing the converted output voltage.
Further, another embodiment of the present invention further provides an LED driving circuit, wherein the main control chip U1 adopts an MT7932 chip. In this embodiment, the MT7932 chip is used as a dc LED driving chip, which has stable performance, can accurately modulate LED current without active devices such as an optical coupler and a secondary side sensing device, and is very convenient and reliable, but is not limited to this, and a chip having a similar function to this chip can be used as a replacement.
While the preferred embodiment and basic principles of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited to the embodiments disclosed, but is intended to cover various modifications, equivalents and alternatives falling within the scope of the invention as claimed.
Claims (5)
1. An LED driving circuit, comprising:
an IC control circuit for driving and controlling the LED; the IC control circuit comprises a main control chip, an MOS (metal oxide semiconductor) tube, a second capacitor, a third capacitor, a fourth capacitor, a first diode, a second diode, a first grounding resistor, a second grounding resistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor and a fourteenth resistor;
a current sensing pin of the main control chip is connected to a cathode of the first diode through the fifth resistor, the fourth resistor, the sixth resistor, the seventh resistor and the eighth resistor which are connected in sequence, and is also connected to a source of the MOS tube and the first grounding resistor and the second grounding resistor which are grounded in parallel through the first resistor; a power supply voltage end is arranged at the connection position between the seventh resistor and the eighth resistor;
a power tube driving pin of the main control chip is connected to one end of the third resistor, and the other end of the third resistor is connected to the grid electrode of the MOS tube and is also connected to the source electrode of the MOS tube through the second resistor;
a feedback voltage pin of the main control chip is connected to the anode of the first diode through the thirteenth resistor and is also connected to a reference ground through the second capacitor and the fourteenth resistor which are connected in parallel;
the third capacitor and the twelfth resistor are connected between the drain electrode and the source electrode of the MOS tube in parallel; the drain of the MOS tube is connected to the anode of the second diode, and the cathode of the second diode is connected to the fourth capacitor and the eleventh resistor which are connected in parallel through the ninth resistor and the tenth resistor which are connected in parallel.
2. The LED driving circuit as claimed in claim 1, wherein the IC control circuit further comprises a first capacitor and an electrolytic capacitor, the internal error output pin of the main control chip is connected to a ground reference through the first capacitor, and the power supply pin of the main control chip is connected to a ground reference through the electrolytic capacitor.
3. An LED driving circuit according to claim 1 or 2, further comprising a power conversion circuit for converting the output current of the IC control circuit into a required operating current, wherein the input terminals of the power conversion circuit are respectively connected to the fourth capacitor, the eleventh resistor, the anode of the first diode and the anode of the second diode.
4. An LED driving circuit according to claim 3, wherein:
the power conversion circuit comprises a transformer, a fifth capacitor, a sixth capacitor, a seventh capacitor, a third diode, a fourth diode, a fifteenth resistor and a sixteenth resistor;
the positive pole of the first primary coil of the transformer is connected to the fourth capacitor and the eleventh resistor respectively and is also connected to digital ground through the sixth capacitor; the cathode of the first primary coil of the transformer is connected to the anode of the second diode;
the anode of the second primary coil of the transformer is connected to the cathode of the first diode, and the cathode of the second primary coil of the transformer is connected to the reference ground;
the anode of the secondary coil of the transformer is connected to the seventh capacitor, the anode of the third diode and the anode of the fourth diode respectively, the third diode and the fourth diode are connected in parallel, the fifteenth resistor and the sixteenth resistor are connected in parallel, and the seventh capacitor is arranged between the sixteenth resistor and the anode of the third diode;
the cathode of the secondary coil of the transformer is connected to digital ground;
the fifth capacitor is arranged between the negative electrode of the second primary coil and the negative electrode of the secondary coil of the transformer.
5. An LED driving circuit according to claim 1 or 2, wherein: the main control chip adopts an MT7932 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920858921.XU CN210609796U (en) | 2019-06-06 | 2019-06-06 | LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920858921.XU CN210609796U (en) | 2019-06-06 | 2019-06-06 | LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210609796U true CN210609796U (en) | 2020-05-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920858921.XU Expired - Fee Related CN210609796U (en) | 2019-06-06 | 2019-06-06 | LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210609796U (en) |
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2019
- 2019-06-06 CN CN201920858921.XU patent/CN210609796U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200522 Termination date: 20210606 |