Reliable driving circuit and lamp

Abstract

The utility model discloses a reliable driving circuit and a lamp. The circuit comprises a live wire end, a zero wire end, a ground wire end, a lightning protection circuit, a rectification filter circuit, a driving circuit, an output filter circuit, an LED positive electrode end and an LED negative electrode end. The live wire end and the null line end are used for receiving externally input alternating current; alternating current passes through the lightning protection circuit and then is transmitted to the input end of the rectification filter circuit, and the lightning protection circuit carries out lightning protection on the alternating current by utilizing a ground wire end through a multi-stage lightning protection circuit structure; the rectifying and filtering circuit is used for rectifying the received alternating current to obtain first direct current; the driving circuit converts the first direct current to obtain driving current, and the driving current acts on the LED positive electrode end and the LED negative electrode end through the output filter circuit. By arranging the lightning protection circuit with a multi-stage lightning protection circuit structure, the surge impact is effectively suppressed. And the driving stability and reliability of the lamp are improved. The utility model is mainly used in the technical field of lighting lamps.

Description

Technical Field

[0001] This utility model relates to the field of lighting fixture technology, specifically to a reliable driving circuit and a lamp. Background Technology

[0002] In the lighting industry, outdoor luminaires place high demands on the quality of high-power power supplies, requiring them to withstand various destructive impacts such as high outdoor temperatures and humidity, lightning strikes, and power surges. In medium-to-high power drive circuits, the transformers within the drive circuit are easily affected by environmental factors, such as lightning and high temperatures, leading to transformer failure. Therefore, improving the reliability and stability of drive circuits is a crucial technical issue that urgently needs to be addressed in the industry. Utility Model Content

[0003] This invention provides a reliable driving circuit and a lamp to solve one or more technical problems existing in the prior art, and at least provides a beneficial option or creates conditions.

[0004] This utility model provides a reliable driving circuit, including: a live wire terminal, a neutral wire terminal, a ground wire terminal, a surge protection circuit, a rectifier and filter circuit, a driving circuit, an output filter circuit, an LED positive terminal, and an LED negative terminal;

[0005] The live wire terminal is used to connect to an external live wire, the neutral wire terminal is used to connect to an external neutral wire, the ground wire terminal is used to connect to an external ground wire, and the live wire terminal and the neutral wire terminal are used to receive external AC power input.

[0006] The positive terminal of the LED is used to connect to the positive terminal of an external LED light panel, and the negative terminal of the LED is used to connect to the negative terminal of an external LED light panel.

[0007] The alternating current is transmitted to the input terminal of the rectifier and filter circuit after passing through the lightning protection circuit. The lightning protection circuit uses a multi-stage lightning protection circuit structure to protect the alternating current from lightning by utilizing the ground wire terminal.

[0008] The rectifier and filter circuit is used to rectify the received AC power to obtain a first DC power; the drive circuit is used to convert the first DC power into a constant current to obtain a drive current for driving the LED light source, and the drive current is applied to the positive and negative terminals of the LED through the output filter circuit.

[0009] Furthermore, the surge protection circuit includes: a front-stage protection circuit and a rear-stage isolation circuit; the front-stage protection circuit includes: a fuse, a discharge tube, a first varistor, a second varistor, a third varistor, a first Y capacitor, a second Y capacitor, a first ferrite bead, a second ferrite bead, and a third ferrite bead;

[0010] The live wire is connected to one end of the fuse, and the other end of the fuse is connected to one end of the third ferrite bead, one end of the first varistor, one end of the third varistor, and the first input terminal of the subsequent isolation circuit; the neutral wire is connected to one end of the first ferrite bead, the other end of the first varistor, one end of the second varistor, and the second input terminal of the subsequent isolation circuit.

[0011] The other end of the first magnetic bead is connected to one end of the second Y capacitor, the other end of the second Y capacitor is connected to one end of the second magnetic bead and one end of the first Y capacitor, and the other end of the first Y capacitor is connected to the other end of the third magnetic bead; the other end of the second varistor is connected to the other end of the third varistor and one end of the discharge tube, and the other end of the discharge tube is connected to the other end of the second magnetic bead and the ground terminal.

[0012] The first output terminal of the subsequent isolation circuit is connected to the first input terminal of the rectifier and filter circuit, and the second output terminal of the subsequent isolation circuit is connected to the second input terminal of the rectifier and filter circuit. The subsequent isolation circuit is used to isolate the AC power output by the preceding protection circuit and transmit the isolated AC power to the rectifier and filter circuit.

[0013] Furthermore, the pre-stage protection circuit also includes a first thermistor, and the neutral terminal is connected to one end of the first ferrite bead, the other end of the first varistor, one end of the second varistor, and the second input terminal of the subsequent isolation circuit through the first thermistor.

[0014] Furthermore, the subsequent isolation circuit includes: a first-stage isolation circuit, a second-stage isolation circuit, and a third-stage isolation circuit; the first-stage isolation circuit includes: a fourth varistor, a fifth varistor, and a first common-mode inductor; the second-stage isolation circuit includes: a first X capacitor, a second common-mode inductor, a third Y capacitor, a fourth Y capacitor, a sixth varistor, a fourth ferrite bead, a fifth ferrite bead, and a sixth ferrite bead; the third-stage isolation circuit includes: a second X capacitor, a first resistor, a third common-mode inductor, and a seventh varistor.

[0015] The first input terminal of the first common-mode inductor is connected to one end of the third varistor, one end of the first varistor, one end of the third ferrite bead, and the other end of the fuse, respectively; the second input terminal of the first common-mode inductor is connected to one end of the fourth varistor, the other end of the first varistor, one end of the second varistor, and the other end of the first thermistor, respectively; the first output terminal of the first common-mode inductor is connected to one end of the fourth varistor, one end of the fifth varistor, one end of the first X capacitor, and the first input terminal of the second common-mode inductor, respectively; the second output terminal of the first common-mode inductor is connected to the other end of the fifth varistor, the other end of the first X capacitor, and the second input terminal of the second common-mode inductor, respectively.

[0016] The first output terminal of the second common-mode inductor is connected to one end of the fourth ferrite bead, one end of the sixth varistor, one end of the second X capacitor, one end of the first resistor, and the first input terminal of the third common-mode inductor, respectively. The second output terminal of the second common-mode inductor is connected to one end of the fifth ferrite bead, the other end of the sixth varistor, the other end of the second X capacitor, the other end of the first resistor, and the second input terminal of the third common-mode inductor, respectively. The other end of the fourth ferrite bead is connected to one end of the third Y capacitor, the other end of the fifth ferrite bead is connected to one end of the fourth Y capacitor, and the other end of the fourth Y capacitor is connected to the other end of the third Y capacitor and one end of the sixth ferrite bead, respectively. The other end of the sixth ferrite bead is connected to the ground terminal.

[0017] The first output terminal of the third common-mode inductor is connected to one end of the seventh varistor and the first input terminal of the rectifier filter circuit, respectively. The second output terminal of the third common-mode inductor is connected to the other end of the seventh varistor and the second input terminal of the rectifier filter circuit, respectively.

[0018] Furthermore, the rectifier filter circuit includes: a rectifier bridge, a first capacitor, a second capacitor, a first electrolytic capacitor, a second resistor, a third resistor, a first inductor, a first diode, a seventh ferrite bead, an eighth ferrite bead, an eighth varistor, a ninth varistor, and a fifth Y capacitor;

[0019] The first input terminal of the rectifier bridge is connected to the first output terminal of the subsequent isolation circuit, and the second input terminal of the rectifier bridge is connected to the second output terminal of the subsequent isolation circuit. The first output terminal of the rectifier bridge is connected to one end of the eighth varistor, one end of the first inductor, one end of the second resistor, and one end of the first capacitor, respectively. The other end of the first inductor is connected to the other end of the second resistor, one end of the second capacitor, the anode of the first diode, one end of the ninth varistor, and the input node of the driving circuit, respectively.

[0020] The second output terminal of the rectifier bridge is connected to one end of the seventh ferrite bead, the other end of the eighth varistor, the other end of the first capacitor, and one end of the eighth ferrite bead, respectively. The other end of the eighth ferrite bead is connected to the other end of the second capacitor, the ground terminal, the negative terminal of the first electrolytic capacitor, one end of the third resistor, and the other end of the ninth varistor, respectively. The positive terminal of the first electrolytic capacitor is connected to the cathode of the first diode and the other end of the third resistor, respectively. The other end of the seventh ferrite bead is connected to one end of the fifth Y capacitor, and the other end of the fifth Y capacitor is connected to the ground terminal.

[0021] Furthermore, the rectifier and filter circuit also includes a second thermistor, and the first output terminal of the rectifier bridge is connected to one end of the eighth varistor, one end of the first inductor, one end of the second resistor and one end of the first capacitor through the second thermistor.

[0022] Furthermore, the output filter circuit includes: a third capacitor, a fourth capacitor, a fourth resistor, a fifth resistor, a ninth ferrite bead, a tenth ferrite bead, a fourth common-mode inductor, and a second electrolytic capacitor;

[0023] One end of the third capacitor is connected to the output node of the driving circuit, the other end of the third capacitor is connected to one end of the fifth resistor, the other end of the fifth resistor is connected to the first output terminal of the fourth common mode inductor and one end of the ninth ferrite bead, and the other end of the ninth ferrite bead is connected to the positive terminal of the second electrolytic capacitor and the positive terminal of the LED.

[0024] The second input terminal of the fourth common-mode inductor is connected to one end of the fourth capacitor and the isolation ground terminal, respectively; the other end of the fourth capacitor is connected to one end of the fourth resistor, the other end of the fourth resistor is connected to one end of the tenth ferrite bead and the second output terminal of the fourth common-mode inductor, and the other end of the tenth ferrite bead is connected to the cathode of the second electrolytic capacitor and the negative terminal of the LED, respectively.

[0025] Furthermore, the driving circuit includes: a first constant current driving module and a second constant current driving module, wherein the first constant current driving module is a driving module based on a constant current driving chip with model number KP1326SPA.

[0026] Furthermore, the second constant current drive module is a drive module based on a constant current drive chip with model number KP1326SPA.

[0027] On the other hand, a lamp is provided, including a reliable driving circuit as described in any one of the above-mentioned technical solutions.

[0028] This invention has at least the following beneficial effects: By setting up a surge protection circuit with a multi-level surge protection structure, it effectively suppresses surge impacts. Through the rectifier filter circuit and the output filter circuit, it achieves a stable output of the drive current, thereby improving the stability and reliability of the lamp drive. This invention is mainly used in the field of lighting fixture technology. Attached Figure Description

[0029] The accompanying drawings are provided to further understand the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this utility model to explain the technical solution of this utility model, and do not constitute a limitation on the technical solution of this utility model.

[0030] Figure 1 This is a schematic diagram of the circuit connection structure of a reliable drive circuit;

[0031] Figure 2 This is a schematic diagram of the circuit connection structure of a lightning protection circuit;

[0032] Figure 3This is a schematic diagram of the circuit connection structure of the first constant current drive module;

[0033] Figure 4 This is a schematic diagram of the circuit connection structure of the second constant current drive module. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0035] It should be noted that although functional modules are divided in the system diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the system or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, and the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0036] refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the circuit connection structure of a reliable drive circuit. Figure 2 This is a schematic diagram of the circuit connection structure of a lightning protection circuit.

[0037] The purpose of this utility model is to provide a reliable driving circuit to solve the problem of outdoor lighting fixtures being susceptible to destructive impacts from lightning surges, thereby improving the overall reliability of the lighting fixtures.

[0038] Therefore, this application provides a reliable driving circuit, including: a live wire terminal L, a neutral wire terminal N, a ground wire terminal PE, a surge protection circuit, a rectifier filter circuit 105, a driving circuit, an output filter circuit, an LED positive terminal LED+, and an LED negative terminal LED-.

[0039] The live wire terminal L is used to connect to an external live wire, the neutral wire terminal N is used to connect to an external neutral wire, the ground wire terminal PE is used to connect to an external ground wire, and the live wire terminal L and the neutral wire terminal N are used to receive external AC power input.

[0040] The positive terminal of the LED, LED+, is connected to the positive terminal of an external LED light panel, and the negative terminal of the LED, LED-, is connected to the negative terminal of an external LED light panel. The AC power is transmitted to the input terminal of the rectifier-filter circuit 105 after passing through the surge protection circuit. The surge protection circuit utilizes a multi-stage surge protection structure to provide surge protection for the AC power using the ground wire (PE).

[0041] The rectifier and filter circuit 105 is used to rectify the received AC power to obtain a first DC power; the drive circuit is used to convert the first DC power into a constant current to obtain a drive current for driving the LED light source, and the drive current is applied to the positive terminal LED+ and the negative terminal LED- of the LED through the output filter circuit.

[0042] In practical use, the positive terminal of the LED (LED+) is connected to the positive terminal of the external LED light board, and the negative terminal of the LED (LED-) is connected to the negative terminal of the external LED light board.

[0043] This invention effectively suppresses surge impacts by incorporating a surge protection circuit with a multi-level surge protection structure. Through the rectifier filter circuit 105 and the output filter circuit, a stable output of the drive current is achieved, thereby improving the stability and reliability of the lamp drive.

[0044] The lightning protection circuit includes a front-stage protection circuit 101 and a rear-stage isolation circuit. The front-stage protection circuit 101 includes a fuse F1, a discharge tube GD1, a first varistor VR1, a second varistor VR2, a third varistor VR3, a first Y capacitor CY1, a second Y capacitor CY2, a first ferrite bead B1, a second ferrite bead B2, and a third ferrite bead B3.

[0045] The live wire L is connected to one end of fuse F1, and the other end of fuse F1 is connected to one end of the third ferrite bead B3, one end of the first varistor VR1, one end of the third varistor VR3, and the first input terminal of the subsequent isolation circuit. The neutral wire N is connected to one end of the first ferrite bead B1, the other end of the first varistor VR1, one end of the second varistor VR2, and the second input terminal of the subsequent isolation circuit.

[0046] The other end of the first magnetic bead B1 is connected to one end of the second Y capacitor CY2. The other end of the second Y capacitor CY2 is connected to one end of the second magnetic bead B2 and one end of the first Y capacitor CY1. The other end of the first Y capacitor CY1 is connected to the other end of the third magnetic bead B3. The other end of the second varistor VR2 is connected to the other end of the third varistor VR3 and one end of the discharge tube GD1. The other end of the discharge tube GD1 is connected to the other end of the second magnetic bead B2 and the ground terminal PE.

[0047] The first output terminal of the post-stage isolation circuit is connected to the first input terminal of the rectifier-filter circuit 105, and the second output terminal of the post-stage isolation circuit is connected to the second input terminal of the rectifier-filter circuit 105. The post-stage isolation circuit is used to isolate the AC power output by the pre-stage protection circuit 101 and transmit the isolated AC power to the rectifier-filter circuit 105.

[0048] The pre-amplification protection circuit 101 primarily protects against surges caused by lightning. When a large surge occurs in the mains power due to lightning, for the live wire L, the surge can be released to the ground terminal GND through the path formed by the third ferrite bead B3, the first Y capacitor CY1, and the second ferrite bead B2. Alternatively, it can be released to the ground terminal GND through the path formed by the first varistor VR1, the second varistor VR2, the third varistor VR3, and the discharge tube GD1. For the neutral wire N, the surge can be released to the ground terminal GND through the path formed by the first ferrite bead B1, the second Y capacitor CY2, and the second ferrite bead B2. Alternatively, it can be released to the ground terminal GND through the path formed by the second varistor VR2 and the discharge tube GD1. The pre-amplification protection circuit 101 provides pre-amplification surge protection for the connected mains power.

[0049] In order to further suppress surge impact, in some further specific embodiments, the front-end protection circuit 101 further includes: a first thermistor NTC1, wherein the neutral terminal N is connected to one end of the first ferrite bead B1, the other end of the first varistor VR1, one end of the second varistor VR2 and the second input terminal of the subsequent isolation circuit through the first thermistor NTC1.

[0050] The first thermistor NTC1 is added to the pre-stage protection circuit 101 to further suppress surges from the perspective of heat.

[0051] Of course, after the pre-stage protection circuit 101, in order to suppress common-mode noise, the AC power after passing through the pre-stage protection circuit 101 will also pass through the subsequent isolation circuit to achieve the effect of suppressing common-mode noise.

[0052] The subsequent isolation circuit mainly employs a multi-stage isolation circuit with a common-mode inductor as its core to suppress common-mode noise. In some further specific embodiments, the subsequent isolation circuit includes: a first-stage isolation circuit 102, a second-stage isolation circuit 103, and a third-stage isolation circuit 104.

[0053] The first-stage isolation circuit 102 includes: a fourth varistor VR4, a fifth varistor VR5, and a first common-mode inductor LF1.

[0054] The second-stage isolation circuit 103 includes: a first X capacitor CX1, a second common-mode inductor LF2, a third Y capacitor CY3, a fourth Y capacitor CY4, a sixth varistor VR6, a fourth ferrite bead B4, a fifth ferrite bead B5, and a sixth ferrite bead B6.

[0055] The third-level isolation circuit 104 includes: a second X capacitor CX2, a first resistor R1, a third common-mode inductor LF3, and a seventh varistor VR7.

[0056] The first input terminal of the first common-mode inductor LF1 is connected to one end of the third varistor VR3, one end of the first varistor VR1, one end of the third ferrite bead B3, and the other end of the fuse F1. The second input terminal of the first common-mode inductor LF1 is connected to one end of the fourth varistor VR4, the other end of the first varistor VR1, one end of the second varistor VR2, and the other end of the first thermistor NTC1.

[0057] The first output terminal of the first common-mode inductor LF1 is connected to one end of the fourth varistor VR4, one end of the fifth varistor VR5, one end of the first X capacitor CX1, and the first input terminal of the second common-mode inductor LF2. The second output terminal of the first common-mode inductor LF1 is connected to the other end of the fifth varistor VR5, the other end of the first X capacitor CX1, and the second input terminal of the second common-mode inductor LF2. The first output terminal of the second common-mode inductor LF2 is connected to one end of the fourth ferrite bead B4, one end of the sixth varistor VR6, one end of the second X capacitor CX2, one end of the first resistor R1, and the first input terminal of the third common-mode inductor LF3.

[0058] The second output terminal of the second common-mode inductor LF2 is connected to one end of the fifth ferrite bead B5, the other end of the sixth varistor VR6, the other end of the second X capacitor CX2, the other end of the first resistor R1, and the second input terminal of the third common-mode inductor LF3.

[0059] The other end of the fourth magnetic bead B4 is connected to one end of the third Y capacitor CY3, the other end of the fifth magnetic bead B5 is connected to one end of the fourth Y capacitor CY4, the other end of the fourth Y capacitor CY4 is connected to the other end of the third Y capacitor CY3 and one end of the sixth magnetic bead B6 respectively; the other end of the sixth magnetic bead B6 is connected to the ground terminal PE.

[0060] The first output terminal of the third common-mode inductor LF3 is connected to one end of the seventh varistor VR7 and the first input terminal of the rectifier filter circuit 105, respectively. The second output terminal of the third common-mode inductor LF3 is connected to the other end of the seventh varistor VR7 and the second input terminal of the rectifier filter circuit 105, respectively.

[0061] In the first-stage isolation circuit 102, the AC current undergoes initial common-mode noise suppression via the first common-mode inductor LF1. After common-mode noise suppression in the first-stage isolation circuit 102, the AC current enters the second-stage isolation circuit 103, where it undergoes a second common-mode noise suppression via the second common-mode inductor LF2. Furthermore, the first X capacitor CX1 is used to filter the input AC current. Simultaneously, the fourth ferrite bead B4, the fifth ferrite bead B5, the third Y capacitor CY3, the fourth Y capacitor CY4, and the sixth ferrite bead B6 are used to guide additional surges to the ground terminal PE for further surge elimination. After passing through the first-stage isolation circuit 102 and the second-stage isolation circuit 103, the AC current passes through the third-stage isolation circuit 104, where it undergoes a final common-mode noise suppression via the third common-mode inductor LF3. The second X capacitor CX2 is also used to filter the input AC current. After the first-stage isolation circuit 102, the second-stage isolation circuit 103, and the third-stage isolation circuit 104, three stages of common-mode noise suppression are achieved, so that the AC power input to the rectifier filter circuit 105 has better waveform and stability.

[0062] In some further specific embodiments, the rectifier filter circuit 105 includes: a rectifier bridge BD1, a first capacitor C1, a second capacitor C2, a first electrolytic capacitor EC1, a second resistor R2, a third resistor R3, a first inductor L1, a first diode D1, a seventh ferrite bead B7, an eighth ferrite bead B8, an eighth varistor VR8, a ninth varistor VR9, and a fifth Y capacitor CY5.

[0063] The first input terminal of the rectifier bridge BD1 is connected to the first output terminal of the subsequent isolation circuit, and the second input terminal of the rectifier bridge BD1 is connected to the second output terminal of the subsequent isolation circuit.

[0064] The first output terminal of the rectifier bridge BD1 is connected to one end of the eighth varistor VR8, one end of the first inductor L1, one end of the second resistor R2, and one end of the first capacitor C1. The other end of the first inductor L1 is connected to the other end of the second resistor R2, one end of the second capacitor C2, the anode of the first diode D1, one end of the ninth varistor VR9, and the input node Vbus of the drive circuit.

[0065] The second output terminal of the rectifier bridge BD1 is connected to one end of the seventh ferrite bead B7, the other end of the eighth varistor VR8, the other end of the first capacitor C1, and one end of the eighth ferrite bead B8. The other end of the eighth ferrite bead B8 is connected to the other end of the second capacitor C2, the ground terminal GND, the negative terminal of the first electrolytic capacitor EC1, one end of the third resistor R3, and the other end of the ninth varistor VR9.

[0066] The positive terminal of the first electrolytic capacitor EC1 is connected to the cathode of the first diode D1 and the other end of the third resistor R3. The other end of the seventh ferrite bead B7 is connected to one end of the fifth Y capacitor CY5, and the other end of the fifth Y capacitor CY5 is connected to the ground terminal PE. In some further specific embodiments, the other end of the fifth Y capacitor CY5 can be connected to the ground terminal PE through a sixth ferrite bead B6.

[0067] To suppress output surges after rectifier bridge BD1, in some further embodiments, the rectifier filter circuit 105 further includes a second thermistor NTC2. The first output terminal of rectifier bridge BD1 is connected to one end of the eighth varistor VR8, one end of the first inductor L1, one end of the second resistor R2, and one end of the first capacitor C1 via the second thermistor NTC2. The second thermistor NTC2 is used to suppress output surges after rectifier bridge BD1 from a thermal perspective.

[0068] After the alternating current passes through the rectifier and filter circuit 105, it forms a first direct current. The driving circuit converts the first direct current into a driving current for driving the LED light source.

[0069] In some further specific embodiments, the driving circuit includes: a first constant current driving module and a second constant current driving module, wherein the first constant current driving module is a driving module based on a constant current driving chip of model KP1326SPA. The second constant current driving module is also a driving module based on a constant current driving chip of model KP1326SPA.

[0070] To better illustrate the structure of the drive circuit, a specific circuit structure will be used as an example below.

[0071] refer to Figure 3 , Figure 3 This is a schematic diagram of the circuit connection structure of the first constant current drive module.

[0072] The first constant current drive module includes: resistors R6 (sixth), R7 (seventh), R8 (eighth), R9 (ninth), R10 (tenth), R11 (eleventh), R12 (twelfth), R14 (fourteenth), R17 (seventeenth), R18 (eighteenth), R19 (nineteenth), R20 (twentieth), R21 (twenty-first), R22 (twenty-second), R23 (twenty-third), R24 (twenty-fourth), R25 (twenty-fifth), R26 (twenty-sixth), R27 (twenty-seventh), and R28 (twenty-eighth). The following capacitors are listed: fifth capacitor C5, sixth capacitor C6, seventh capacitor C7, eighth capacitor C8, ninth capacitor C9, tenth capacitor C10, eleventh capacitor C11, twelfth capacitor C12, thirteenth capacitor C13, fourteenth capacitor C14, third electrolytic capacitor EC3, fourth electrolytic capacitor EC4, eleventh ferrite bead B11, second diode D2, third diode D3, fourth diode D4, fifth diode D5, first MOSFET Q1, second transistor Q2, third transistor Q3, first Zener diode ZD1, first constant current drive chip U1, and first transformer T1.

[0073] The input node Vbus of the driving circuit is connected to one end of the sixth resistor R6, the ninth resistor R9, one end of the fifth capacitor C5, one end of the tenth varistor, one end of the seventeenth resistor R17, one end of the sixth capacitor C6, and one end of the primary winding of the first transformer T1.

[0074] The other end of the sixth resistor R6 is connected to the cathode of the fifth diode D5, one end of the twelfth capacitor C12, the positive terminal of the third electrolytic capacitor EC3, one end of the eighth resistor R8, one end of the thirteenth capacitor C13, and the sixth pin of the first constant current drive chip U1. The other end of the eighth resistor R8 is connected to the collector of the second transistor Q2. The base of the second transistor Q2 is connected to the base of the third transistor Q3, one end of the tenth resistor R10, one end of the twenty-first resistor R21, and the cathode of the second diode D2. The other end of the tenth resistor R10 is connected to the fifth pin of the first constant current drive chip U1.

[0075] The emitter of the second transistor Q2 is connected to the emitter of the third transistor Q3, the other end of the twenty-first resistor R21, the anode of the second diode D2, and one end of the twentieth resistor R20, respectively. The collector of the third transistor Q3 is connected to one end of the fourteenth resistor R14.

[0076] The other end of the twentieth resistor R20 is connected to the cathode of the first Zener diode ZD1, one end of the twenty-third resistor R23, and the gate of the first MOSFET Q1. The other end of the twenty-third resistor R23 is connected to one end of the twenty-second resistor R22, one end of the twenty-fourth resistor R24, the source of the first MOSFET Q1, and one end of the ninth capacitor C9. The other end of the twenty-second resistor R22 is connected to the third pin of the first constant current driver chip U1.

[0077] The other end of the ninth capacitor C9 is connected to the drain of the first MOS transistor Q1, one end of the eleventh ferrite bead B11, one end of the seventh capacitor C7, and the anode of the fourth diode D4. The other end of the seventh capacitor C7 is connected to the cathode of the fourth diode D4, one end of the eighteenth resistor R18, and one end of the nineteenth resistor R19. The other end of the eighteenth resistor R18 is connected to the other end of the nineteenth resistor R19, the other end of the seventeenth resistor R17, and the other end of the sixth capacitor C6. The other end of the eleventh ferrite bead B11 is connected to the other end of the primary winding of the first transformer T1.

[0078] The anode of the fifth diode D5 is connected to one end of the seventh resistor R7. The other end of the seventh resistor R7 is connected to one end of the twenty-fifth resistor R25 and one end of the auxiliary winding of the first transformer T1. The other end of the twenty-fifth resistor R25 is connected to one end of the twenty-sixth resistor R26, the second pin of the first constant current drive chip U1, and one end of the eleventh capacitor C11.

[0079] The seventh pin of the first constant current driver chip U1 is connected to one end of the eleventh resistor R11, and the eighth pin of the first constant current driver chip U1 is connected to one end of the fourteenth capacitor C14, the other end of the ninth resistor R9, and one end of the twelfth resistor R12.

[0080] The grounding terminal GND is connected to the other end of the fifth capacitor C5, the other end of the tenth varistor, the other end of the twelfth capacitor C12, the negative terminal of the third electrolytic capacitor EC3, the other end of the thirteenth capacitor C13, the other end of the eleventh resistor R11, the other end of the twelfth resistor R12, the other end of the fourteenth capacitor C14, the other end of the tenth capacitor C10, the fourth pin of the first constant current drive chip U1, the other end of the eleventh capacitor C11, the other end of the twenty-sixth resistor R26, the other end of the twenty-fourth resistor R24, and the other end of the auxiliary winding of the first transformer T1.

[0081] One end of the secondary winding of the first transformer T1 is connected to the anode of the third diode D3 and one end of the twenty-seventh resistor R27. The other end of the twenty-seventh resistor R27 is connected to one end of the eighth capacitor C8. The cathode of the third diode D3 is connected to the other end of the eighth resistor R8, the positive terminal of the fourth electrolytic capacitor EC4, one end of the twenty-eighth resistor R28, and the output node V+ of the drive circuit.

[0082] The other end of the secondary winding of the first transformer T1 is connected to the negative terminal of the fourth electrolytic capacitor EC4, the other end of the twenty-eighth resistor R28, and the isolation ground terminal SGND. The model of the first constant current drive chip U1 is KP1326SPA.

[0083] The first constant current driver chip U1 stores and discharges energy to the first transformer T1 by switching the first MOSFET Q1 on and off, providing energy to the load. Simultaneously, the third pin of the first constant current driver chip U1 is the output current sampling pin. It controls the no-load voltage output by detecting the voltage division ratio of the sampling resistor (the twenty-fourth resistor R24). The output circuit, composed of the third diode D3, the twenty-seventh resistor R27, the twenty-eighth resistor R28, the eighth capacitor C8, and the fourth electrolytic capacitor EC4, provides a stable drive current output to the load.

[0084] refer to Figure 4 , Figure 4 This is a schematic diagram of the circuit connection structure of the second constant current drive module.

[0085] The second constant current drive module includes: resistors R29 (twentieth), R30 (thirtieth), R31 (thirtieth), R32 (thirtieth), R33 (thirtieth), R34 (thirtieth), R36 (thirtieth), R37 (thirtieth), R38 (thirtieth), R39 (thirtieth), R40 (fortieth), R41 (fortieth), R42 (fortieth), R43 (fortieth), R44 (fortieth), R45 (fortieth), R46 (fortieth), R47 (fortieth), R48 (fortieth), R49 (fortieth), and R49 (fifth). Capacitor C15, sixteenth capacitor C16, seventeenth capacitor C17, eighteenth capacitor C18, nineteenth capacitor C19, twentieth capacitor C20, twenty-first capacitor C21, twenty-second capacitor C22, twenty-third capacitor C23, twenty-fourth capacitor C24, fifth electrolytic capacitor EC5, sixth electrolytic capacitor EC6, eleventh varistor VR11, twelfth ferrite bead B12, sixth diode D6, seventh diode D7, eighth diode D8, ninth diode D9, fourth MOSFET Q4, fifth transistor Q5, sixth transistor Q6, second Zener diode ZD2, second constant current driver chip U2, and second transformer T2.

[0086] The input node Vbus of the drive circuit is connected to one end of the 30th resistor R30, the 32nd resistor R32, one end of the 15th capacitor C15, one end of the 11th varistor VR11, one end of the 45th resistor R45, one end of the 16th capacitor C16, and one end of the primary winding of the second transformer T2.

[0087] The other end of the thirtieth resistor R30 is connected to the cathode of the ninth diode D9, one end of the twenty-fourth capacitor C24, the positive terminal of the fifth electrolytic capacitor EC5, one end of the thirty-first resistor R31, one end of the twentieth capacitor C20, and the sixth pin of the second constant current drive chip U2.

[0088] The other end of the thirty-first resistor R31 is connected to the collector of the fifth transistor Q5. The base of the fifth transistor Q5 is connected to the base of the sixth transistor Q6, one end of the forty-second resistor R42, one end of the forty-third resistor R43, and the cathode of the eighth diode D8. The other end of the forty-second resistor R42 is connected to the fifth pin of the first constant current drive chip U1.

[0089] The emitter of the fifth transistor Q5 is connected to the emitter of the sixth transistor Q6, the other end of the forty-third resistor R43, the anode of the eighth diode D8, and one end of the fortieth resistor R40. The collector of the sixth transistor Q6 is connected to one end of the forty-fourth resistor R44. The other end of the fortieth resistor R40 is connected to the cathode of the second Zener diode ZD2, one end of the forty-first resistor R41, and the gate of the fourth MOSFET Q4. The other end of the forty-first resistor R41 is connected to one end of the thirty-ninth resistor R39, one end of the thirty-eighth resistor R38, the source of the fourth MOSFET Q4, and one end of the nineteenth capacitor C19. The other end of the thirty-ninth resistor R39 is connected to the third pin of the second constant current driver chip U2.

[0090] The other end of the nineteenth capacitor C19 is connected to the drain of the fourth MOS transistor Q4, one end of the twelfth ferrite bead B12, one end of the seventeenth capacitor C17, and the anode of the sixth diode D6. The other end of the seventeenth capacitor C17 is connected to the cathode of the sixth diode D6, one end of the forty-sixth resistor R46, and one end of the forty-seventh resistor R47. The other end of the forty-sixth resistor R46 is connected to the other end of the forty-seventh resistor R47, the other end of the forty-fifth resistor R45, and the other end of the sixteenth capacitor C16. The other end of the twelfth ferrite bead B12 is connected to the other end of the primary winding of the second transformer T2.

[0091] The anode of the ninth diode D9 is connected to one end of the twenty-ninth resistor R29. The other end of the twenty-ninth resistor R29 is connected to one end of the thirty-seventh resistor R37 and one end of the auxiliary winding of the second transformer T2. The other end of the thirty-seventh resistor R37 is connected to one end of the thirty-sixth resistor R36, the second pin of the second constant current drive chip U2, and one end of the twenty-third capacitor C23.

[0092] The seventh pin of the second constant current driver chip U2 is connected to one end of the thirty-third resistor R33, and the eighth pin of the second constant current driver chip U2 is connected to one end of the twenty-first capacitor C21, the other end of the thirty-second resistor R32, and one end of the thirty-fourth resistor R34.

[0093] The grounding terminal GND is connected to the other end of the fifteenth capacitor C15, the other end of the eleventh varistor VR11, the negative terminal of the fifth electrolytic capacitor EC5, the other end of the twentieth capacitor C20, the other end of the twenty-first capacitor C21, the other end of the twenty-second capacitor C22, the other end of the twenty-third capacitor C23, the other end of the twenty-fourth capacitor C24, the other end of the thirty-third resistor R33, the thirty-fourth resistor R34, the other end of the thirty-sixth resistor R36, the fourth pin of the second constant current drive chip U2, and the other end of the auxiliary winding of the second transformer T2.

[0094] One end of the secondary winding of the second transformer T2 is connected to the anode of the seventh diode D7 and one end of the forty-eighth resistor R48. The other end of the forty-eighth resistor R48 is connected to one end of the eighteenth capacitor C18. The cathode of the seventh diode D7 is connected to the other end of the eighteenth resistor R18, the positive terminal of the sixth electrolytic capacitor EC6, one end of the forty-ninth resistor R49, and the output node V+ of the drive circuit.

[0095] The other end of the secondary winding of the second transformer T2 is connected to the negative terminal of the sixth electrolytic capacitor EC6, the other end of the forty-ninth resistor R49, and the isolation ground terminal SGND. The model of the second constant current drive chip U2 is KP1326SPA.

[0096] The second constant current driver chip U2 stores and discharges energy to the second transformer T2 through the conduction and closure of the fourth MOSFET Q4, providing energy to the load. Simultaneously, the third pin of the second constant current driver chip U2 is the output current sampling pin. It controls the no-load voltage output by detecting the voltage division ratio of the sampling resistor (the thirty-eighth resistor R38). The output circuit, composed of the seventh diode D7, the forty-eighth resistor R48, the forty-ninth resistor R49, the eighteenth capacitor C18, and the sixth electrolytic capacitor EC6, provides a stable drive current output to the load.

[0097] To ensure a more stable driving current, the driving current also passes through an output filter circuit. In some further specific embodiments, the output filter circuit includes: a third capacitor C3, a fourth capacitor C4, a fourth resistor R4, a fifth resistor R5, a ninth ferrite bead B9, a tenth ferrite bead B10, a fourth common-mode inductor LF4, and a second electrolytic capacitor EC2.

[0098] One end of the third capacitor C3 is connected to the output node V+ of the driving circuit, and the other end of the third capacitor C3 is connected to one end of the fifth resistor R5. The other end of the fifth resistor R5 is connected to the first output terminal of the fourth common mode inductor LF4 and one end of the ninth ferrite bead B9. The other end of the ninth ferrite bead B9 is connected to the positive terminal of the second electrolytic capacitor EC2 and the positive terminal of the LED LED+.

[0099] The second input terminal of the fourth common-mode inductor LF4 is connected to one end of the fourth capacitor C4 and the isolation ground terminal SGND. The other end of the fourth capacitor C4 is connected to one end of the fourth resistor R4, and the other end of the fourth resistor R4 is connected to one end of the tenth ferrite bead B10 and the second output terminal of the fourth common-mode inductor LF4. The other end of the tenth ferrite bead B10 is connected to the cathode of the second electrolytic capacitor EC2 and the negative terminal LED- of the LED.

[0100] To improve stability, the input node Vbus of the drive circuit is connected to the isolation ground terminal SGND via the seventh Y capacitor CY7. The isolation ground terminal SGND is then connected to the ground terminal GND via the sixth Y capacitor CY6.

[0101] On the other hand, this application also provides a lamp that integrates the reliable driving circuit described in any of the above embodiments.

[0102] Although the description of this application has been quite detailed and particularly focused on several described embodiments, it is not intended to limit itself to any of these details or embodiments or any particular embodiment. Rather, it should be considered as effectively covering the intended scope of this application by referring to the appended claims and taking into account the broad possible interpretations of these claims provided by the prior art. Furthermore, the foregoing description of this application with respect to embodiments foreseeable by the inventor is intended to provide a useful description, and non-substantial modifications to this application that have not yet been foreseen may still represent equivalent modifications.

Claims

1. A reliable driving circuit, characterized in that, include: Live wire terminal, neutral wire terminal, ground wire terminal, surge protection circuit, rectifier and filter circuit, driver circuit, output filter circuit, LED positive terminal and LED negative terminal; The live wire terminal is used to connect to an external live wire, the neutral wire terminal is used to connect to an external neutral wire, the ground wire terminal is used to connect to an external ground wire, and the live wire terminal and the neutral wire terminal are used to receive external AC power input. The positive terminal of the LED is used to connect to the positive terminal of an external LED light panel, and the negative terminal of the LED is used to connect to the negative terminal of an external LED light panel. The alternating current is transmitted to the input terminal of the rectifier and filter circuit after passing through the lightning protection circuit. The lightning protection circuit uses a multi-stage lightning protection circuit structure to protect the alternating current from lightning by utilizing the ground wire terminal. The rectifier and filter circuit is used to rectify the received AC power to obtain the first DC power. The driving circuit is used to convert the first DC current into a constant current to obtain a driving current for driving the LED light source. The driving current is applied to the positive and negative terminals of the LED through the output filter circuit.

2. The reliable driving circuit according to claim 1, characterized in that, The lightning protection circuit includes: a front-stage protection circuit and a rear-stage isolation circuit; The pre-stage protection circuit includes: a fuse, a discharge tube, a first varistor, a second varistor, a third varistor, a first Y capacitor, a second Y capacitor, a first ferrite bead, a second ferrite bead, and a third ferrite bead; The live wire is connected to one end of the fuse, and the other end of the fuse is connected to one end of the third ferrite bead, one end of the first varistor, one end of the third varistor, and the first input terminal of the subsequent isolation circuit; the neutral wire is connected to one end of the first ferrite bead, the other end of the first varistor, one end of the second varistor, and the second input terminal of the subsequent isolation circuit. The other end of the first magnetic bead is connected to one end of the second Y capacitor, the other end of the second Y capacitor is connected to one end of the second magnetic bead and one end of the first Y capacitor, and the other end of the first Y capacitor is connected to the other end of the third magnetic bead; the other end of the second varistor is connected to the other end of the third varistor and one end of the discharge tube, and the other end of the discharge tube is connected to the other end of the second magnetic bead and the ground terminal. The first output terminal of the subsequent isolation circuit is connected to the first input terminal of the rectifier and filter circuit, and the second output terminal of the subsequent isolation circuit is connected to the second input terminal of the rectifier and filter circuit. The subsequent isolation circuit is used to isolate the AC power output by the preceding protection circuit and transmit the isolated AC power to the rectifier and filter circuit.

3. A reliable driving circuit according to claim 2, characterized in that, The pre-stage protection circuit further includes a first thermistor, and the neutral terminal is connected to one end of the first ferrite bead, the other end of the first varistor, one end of the second varistor, and the second input terminal of the subsequent isolation circuit through the first thermistor.

4. A reliable driving circuit according to claim 2, characterized in that, The subsequent isolation circuit includes: a first-stage isolation circuit, a second-stage isolation circuit, and a third-stage isolation circuit; The first-stage isolation circuit includes: a fourth varistor, a fifth varistor, and a first common-mode inductor; the second-stage isolation circuit includes: a first X capacitor, a second common-mode inductor, a third Y capacitor, a fourth Y capacitor, a sixth varistor, a fourth ferrite bead, a fifth ferrite bead, and a sixth ferrite bead; the third-stage isolation circuit includes: a second X capacitor, a first resistor, a third common-mode inductor, and a seventh varistor. The first input terminal of the first common-mode inductor is connected to one end of the third varistor, one end of the first varistor, one end of the third ferrite bead, and the other end of the fuse, respectively; the second input terminal of the first common-mode inductor is connected to one end of the fourth varistor, the other end of the first varistor, one end of the second varistor, and the other end of the first thermistor, respectively; the first output terminal of the first common-mode inductor is connected to one end of the fourth varistor, one end of the fifth varistor, one end of the first X capacitor, and the first input terminal of the second common-mode inductor, respectively; the second output terminal of the first common-mode inductor is connected to the other end of the fifth varistor, the other end of the first X capacitor, and the second input terminal of the second common-mode inductor, respectively. The first output terminal of the second common-mode inductor is connected to one end of the fourth ferrite bead, one end of the sixth varistor, one end of the second X capacitor, one end of the first resistor, and the first input terminal of the third common-mode inductor, respectively. The second output terminal of the second common-mode inductor is connected to one end of the fifth ferrite bead, the other end of the sixth varistor, the other end of the second X capacitor, the other end of the first resistor, and the second input terminal of the third common-mode inductor, respectively. The other end of the fourth ferrite bead is connected to one end of the third Y capacitor, the other end of the fifth ferrite bead is connected to one end of the fourth Y capacitor, and the other end of the fourth Y capacitor is connected to the other end of the third Y capacitor and one end of the sixth ferrite bead, respectively. The other end of the sixth ferrite bead is connected to the ground terminal. The first output terminal of the third common-mode inductor is connected to one end of the seventh varistor and the first input terminal of the rectifier filter circuit, respectively. The second output terminal of the third common-mode inductor is connected to the other end of the seventh varistor and the second input terminal of the rectifier filter circuit, respectively.

5. A reliable driving circuit according to claim 1, characterized in that, The rectifier and filter circuit includes: a rectifier bridge, a first capacitor, a second capacitor, a first electrolytic capacitor, a second resistor, a third resistor, a first inductor, a first diode, a seventh ferrite bead, an eighth ferrite bead, an eighth varistor, a ninth varistor, and a fifth Y capacitor; The first input terminal of the rectifier bridge is connected to the first output terminal of the subsequent isolation circuit, and the second input terminal of the rectifier bridge is connected to the second output terminal of the subsequent isolation circuit. The first output terminal of the rectifier bridge is connected to one end of the eighth varistor, one end of the first inductor, one end of the second resistor, and one end of the first capacitor, respectively. The other end of the first inductor is connected to the other end of the second resistor, one end of the second capacitor, the anode of the first diode, one end of the ninth varistor, and the input node of the driving circuit, respectively. The second output terminal of the rectifier bridge is connected to one end of the seventh ferrite bead, the other end of the eighth varistor, the other end of the first capacitor, and one end of the eighth ferrite bead, respectively. The other end of the eighth ferrite bead is connected to the other end of the second capacitor, the ground terminal, the negative terminal of the first electrolytic capacitor, one end of the third resistor, and the other end of the ninth varistor, respectively. The positive terminal of the first electrolytic capacitor is connected to the cathode of the first diode and the other end of the third resistor, respectively. The other end of the seventh ferrite bead is connected to one end of the fifth Y capacitor, and the other end of the fifth Y capacitor is connected to the ground terminal.

6. A reliable driving circuit according to claim 5, characterized in that, The rectifier and filter circuit further includes a second thermistor, and the first output terminal of the rectifier bridge is connected to one end of the eighth varistor, one end of the first inductor, one end of the second resistor and one end of the first capacitor through the second thermistor.

7. A reliable driving circuit according to claim 1, characterized in that, The output filter circuit includes: a third capacitor, a fourth capacitor, a fourth resistor, a fifth resistor, a ninth ferrite bead, a tenth ferrite bead, a fourth common-mode inductor, and a second electrolytic capacitor; One end of the third capacitor is connected to the output node of the driving circuit, the other end of the third capacitor is connected to one end of the fifth resistor, the other end of the fifth resistor is connected to the first output terminal of the fourth common mode inductor and one end of the ninth ferrite bead, and the other end of the ninth ferrite bead is connected to the positive terminal of the second electrolytic capacitor and the positive terminal of the LED. The second input terminal of the fourth common-mode inductor is connected to one end of the fourth capacitor and the isolation ground terminal, respectively; the other end of the fourth capacitor is connected to one end of the fourth resistor, the other end of the fourth resistor is connected to one end of the tenth ferrite bead and the second output terminal of the fourth common-mode inductor, and the other end of the tenth ferrite bead is connected to the cathode of the second electrolytic capacitor and the negative terminal of the LED, respectively.

8. A reliable driving circuit according to claim 1, characterized in that, The driving circuit includes: a first constant current driving module and a second constant current driving module, wherein the first constant current driving module is a driving module based on a constant current driving chip with model number KP1326SPA.

9. A reliable driving circuit according to claim 8, characterized in that, The second constant current drive module is a drive module based on a constant current drive chip with model number KP1326SPA.

10. A lamp, characterized in that, include: The reliable drive circuit according to any one of claims 1 to 9.

Images