CN221531727U - LED driving circuit - Google Patents
LED driving circuit Download PDFInfo
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- CN221531727U CN221531727U CN202322959830.4U CN202322959830U CN221531727U CN 221531727 U CN221531727 U CN 221531727U CN 202322959830 U CN202322959830 U CN 202322959830U CN 221531727 U CN221531727 U CN 221531727U
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Abstract
The utility model discloses an LED driving circuit, which has the technical scheme that the LED driving circuit comprises: the LED driving circuit comprises a voltage stabilizing type booster circuit, a potentiometer, a switching tube driving circuit and an LED load; the LED high-definition camera is characterized in that the input end of the voltage-stabilizing type booster circuit is connected with the output end of the power supply circuit, the output end of the voltage-stabilizing type booster circuit is connected with the input end of the LED load, the control end of the voltage-stabilizing type booster circuit is connected with the grounding end through the potentiometer, the input end of the switching tube driving circuit is connected with the PWM signal output end, the output end of the switching tube driving circuit is connected with the grid electrode of the switching tube, the source electrode of the switching tube is connected with the output end of the LED load, and the drain electrode of the switching tube is connected with the grounding end.
Description
Technical Field
The utility model belongs to the technical field of LED driving, and particularly relates to an LED driving circuit.
Background
The existing LEDs are widely applied in the field of stage lamps and landscaping due to the advantages of energy conservation, long service life, environmental protection, high efficiency and the like, so that the LED light source gradually replaces the traditional light source in the field of stage lamps and landscaping.
In addition, in the field of stage lighting and landscape lighting, the LED light source needs to be driven with a constant current, and in addition, the brightness of the LED light source needs to be regulated by regulating the driving current of the LED light source, most of LED driving circuits adopt a PWM (Pulse-width modulation) mode to regulate the brightness of the LED, when the LED is low in brightness, if the PWM frequency is low, light and dark streak light can occur in light rays when a mobile phone with higher resolution is used for photographing or a video camera is used for photographing/shooting, if the PWM frequency is high, the requirement on the driving frequency of the LED is high, the driving frequency of the LED needs to be high, the driving frequency of the LED is high, and the heating of an electronic element is high, so that the driving frequency of the LED is limited, so that the PWM frequency in the existing LED driving scheme for regulating the brightness of the LED by the PWM mode is limited, and the LED load can generate the light and dark streak light under the lens of a high-definition camera under the condition of the low brightness of the LED.
Disclosure of utility model
The utility model aims to provide an LED driving circuit, which can prevent the LED load from generating bright and dark stripe light under the lens of a high-definition camera when the LED load is low in brightness.
An LED driving circuit comprising: the LED driving circuit comprises a voltage stabilizing type booster circuit, a potentiometer, a switching tube driving circuit and an LED load; the input end of the voltage-stabilizing type booster circuit is connected with the output end of the power supply circuit, the output end of the voltage-stabilizing type booster circuit is connected with the input end of the LED load, the control end of the voltage-stabilizing type booster circuit is connected with the grounding end through the potentiometer, the input end of the switching tube driving circuit is connected with the PWM signal output end, the output end of the switching tube driving circuit is connected with the grid electrode of the switching tube, the source electrode of the switching tube is connected with the output end of the LED load, and the drain electrode of the switching tube is connected with the grounding end.
Optionally, the method further comprises: a voltage stabilizing circuit; the input end of the voltage stabilizing circuit is connected with the output end of the power supply circuit, and the output end of the voltage stabilizing circuit is connected with the voltage stabilizing type boosting circuit and the switching tube driving circuit.
Optionally, the voltage stabilizing boost circuit includes: a first diode, a first inductor, a first capacitor, a fourth capacitor, a fifth capacitor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor and a switch circuit;
the first end of the first inductor is used as the input end of the voltage-stabilizing type booster circuit and is connected with the output end of the power supply circuit, the first end of the first inductor is also connected with the grounding end through the first capacitor, the other end of the first inductor is connected with the anode of the first diode, the cathode of the first diode is used as the output end of the voltage-stabilizing type booster circuit and is connected with the input end of the LED load, the cathode of the first diode is also connected with the grounding end through the fifth capacitor, and the cathode of the first diode is also connected with the grounding end through the eleventh resistor;
The input end of the switching circuit is connected with the output end of the power supply circuit, the output end of the switching circuit is connected with the cathode of the first diode, and the feedback input end of the switching circuit is connected with the cathode of the first diode through a ninth resistor;
The first end of the eighth resistor is connected with the cathode of the first diode through the tenth resistor and the fourth capacitor in sequence, the first end of the eighth resistor is also connected with the cathode of the first diode through the ninth resistor, and the second end of the eighth resistor is used as the control end of the voltage stabilizing type booster circuit and is connected with the grounding end through the potentiometer.
Optionally, the switching circuit includes: the MOS transistor comprises a first chip, an MOS transistor, a second capacitor, a third capacitor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and an MOS transistor driving circuit;
The first pin of the first chip is connected with the grounding end through a second capacitor, the second pin is connected with the output end of the power supply circuit through a second resistor, the seventh pin is connected with the grounding end, the eighth pin is connected with the grid electrode of the MOS tube through a fifth resistor, the eighth pin is also connected with the source electrode of the MOS tube, the ninth pin is connected with the input end of the MOS tube driving circuit, the tenth pin is connected with the grounding end through a third capacitor, and the tenth pin is also connected with the output end of the power supply circuit through a third resistor;
The output end of the MOS tube driving circuit is connected with the grid electrode of the MOS tube, the source electrode of the MOS tube is connected with the grounding end through the sixth resistor, and the drain electrode of the MOS tube is used as the output end of the switching circuit to be connected with the anode of the first diode;
The first end of the fourth resistor is connected with the fifth pin of the first chip, the second end of the fourth resistor is connected with the cathode of the first diode through the ninth resistor as a feedback input end of the switching circuit.
Optionally, the MOS transistor driving circuit includes: the second chip, the sixth capacitor and the seventh resistor;
The first pin of the second chip is used as an input end of the MOS tube driving circuit to be connected with a ninth pin of the first chip, the second pin of the second chip is connected with a grounding end, the third pin of the second chip is connected with a fourth pin of the second chip, the fifth pin of the second chip is connected with auxiliary voltage, and the fifth pin of the second chip is also connected with the grounding end through a sixth capacitor;
And the first end of the seventh resistor is connected with the fourth pin of the second chip, and the second end of the seventh resistor is used as the output end of the MOS tube driving circuit and is connected with the grid electrode of the MOS tube.
Optionally, the first diode is a first TVS diode; and the anode of the first TVS diode is connected with the drain electrode of the MOS tube, and the cathode of the first TVS diode is connected with the input end of the LED load.
Optionally, the switching tube driving circuit includes: a third chip, a seventh capacitor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor and a fifteenth resistor;
The first end of the fifteenth resistor is used as the input end of the switching tube driving circuit to be connected with the PWM signal output end, and the second end of the fifteenth resistor is connected with the first pin of the third chip;
The second pin of the third chip is connected with the grounding end, the third pin of the third chip is connected with the fourth pin of the third chip, the fifth pin of the third chip is connected with the auxiliary voltage, and the fifth pin of the third chip is also connected with the grounding end through a seventh capacitor;
The first end of the thirteenth resistor is connected with the third pin of the third chip, the second end of the thirteenth resistor is used as the output end of the switching tube driving circuit to be connected with the grid electrode of the switching tube, and the second end of the thirteenth resistor is also connected with the grounding end through the twelfth resistor.
Optionally, the voltage stabilizing circuit includes: a fourth chip, a second inductor, a second diode, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, and a twentieth resistor;
The seventh pin of the fourth chip is used as an input end of the voltage stabilizing circuit and is connected with an output end of the power circuit, the eighth pin of the fourth chip is connected with the first pin of the fourth chip through a twelfth capacitor, the second pin of the fourth chip is connected with the seventh pin of the fourth chip through a sixteenth resistor, the second pin of the fourth chip is also connected with a grounding end through a sixteenth resistor and a seventeenth resistor in sequence, the third pin of the fourth chip is connected with the grounding end through a tenth capacitor and an eighteenth resistor in sequence, the third pin of the third chip is also connected with the grounding end through an eleventh capacitor, the fourth pin of the fourth chip is connected with the grounding end through a twentieth resistor, the fifth pin of the fourth chip and the ninth chip are connected with the grounding end, and the sixth pin of the fourth chip is connected with the grounding end through the seventeenth resistor;
The first end of the second inductor is connected with the first pin of the fourth chip, the first end of the second inductor is also connected with the cathode of the second diode, the second end of the second inductor is used as the output end of the voltage stabilizing circuit to be connected with the voltage stabilizing type voltage boosting circuit and the switching tube driving circuit, the second end of the second inductor is also connected with the grounding end through a thirteenth capacitor, the second end of the second inductor is also connected with the fourth pin of the fourth chip through a nineteenth resistor, and the anode of the second diode is connected with the grounding end.
Optionally, the second diode is a second TVS diode; and the anode of the second TVS diode is connected with the grounding end, and the cathode of the second TVS diode is connected with the first end of the second inductor.
Optionally, the LED load includes: a plurality of light emitting diodes; the LEDs are sequentially connected in series to form an LED string, the anode of the LED string is used as the input end of the LED load to be connected with the output end of the voltage stabilizing type booster circuit, and the cathode of the LED string is used as the output end of the LED load to be connected with the drain electrode of the switching tube.
The technical scheme provided by the utility model has the following advantages and effects: the voltage-stabilizing type voltage-boosting circuit boosts the power supply voltage output by the output end of the power supply circuit, so that the boosted power supply voltage meets the requirements of an LED load, the resistor of the potentiometer is regulated through the arrangement of the potentiometer, the current flowing through the LED load is regulated, the LED current reaches the rated current of the LED load, the effect of constant-voltage and constant-current driving of the LED load is realized, the LED load is driven by constant voltage, the ripple of the LED current is controlled in a smaller range, the output average current of the LED load can reach the maximum current of the LED load, the brightness of the LED load can reach the highest, the input end of the switching tube driving circuit is connected with the PWM signal output end, the switching tube driving circuit is controlled through the PWM signal, so that the on-off of the switching tube is controlled, the frequency of the PWM signal can reach higher frequency, the LED load can be prevented from generating bright and dark stripe light under the lens of the high-definition camera even if the LED load is low-brightness, and the LED load is suitable for places with strict requirements on light such as theatres and studio.
Drawings
FIG. 1 is a schematic diagram of the circuit connections of an LED driver circuit of the present disclosure;
FIG. 2 is a schematic circuit diagram of a voltage stabilizing type boost circuit of the present disclosure;
FIG. 3 is a schematic circuit diagram of a switching tube driving circuit of the present disclosure;
Fig. 4 is a schematic circuit diagram of a voltage regulator circuit of the present disclosure.
Reference numerals illustrate:
100. A voltage stabilizing type boost circuit; 101. a switching circuit; 102. a MOS tube driving circuit; 200. a switching tube driving circuit; 300. an LED load; 400. a voltage stabilizing circuit; 500. a power supply circuit; u1, a first chip; u2, a second chip; u3, a third chip; u4, a fourth chip; VR, potentiometer; q1, a switching tube; q2, MOS tube; d1, a first diode; d2, a second diode; l1, a first inductor; l2, a second inductor; c1, a first capacitor; c2, a second capacitor; c3, a third capacitor; c4, a fourth capacitor; c5, a fifth capacitor; c6, a sixth capacitor; c7, a seventh capacitor; c8, an eighth capacitor; c9, a ninth capacitor; c10, tenth capacitance; c11, eleventh capacitance; c12, twelfth capacitance; c13, thirteenth capacitance; r1, a first resistor; r2, a second resistor; r3, a third resistor; r4, a fourth resistor; r5, a fifth resistor; r6, a sixth resistor; r7, a seventh resistor; r8, eighth resistor; r9, ninth resistor; r10, tenth resistor; r11, eleventh resistor; r12, twelfth resistor; r13, thirteenth resistance; r14, fourteenth resistor; r15, fifteenth resistor; r16, sixteenth resistance; r17, seventeenth resistance; r18, eighteenth resistor; r19, nineteenth resistor; r20, twentieth resistance.
Detailed Description
In order that the utility model may be readily understood, a more particular description of specific embodiments thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
As used herein, "first and second.+ -." are used merely to distinguish names and do not represent a specific number or order unless specifically indicated or otherwise defined.
The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items, unless specifically stated or otherwise defined.
The term "fixed" or "connected" as used herein may be directly fixed or connected to an element, or indirectly fixed or connected to an element.
As shown in fig. 1, an embodiment of the present utility model discloses an LED driving circuit, including:
a voltage stabilizing type booster circuit 100;
A potentiometer VR;
a switching tube Q1;
A switching tube driving circuit 200;
An LED load 300;
The input end of the voltage-stabilizing type boost circuit 100 is connected with the output end of the power supply circuit 500, the output end of the voltage-stabilizing type boost circuit 100 is connected with the input end of the LED load 300, the control end of the voltage-stabilizing type boost circuit 100 is connected with the grounding end through the potentiometer VR, the input end of the switching tube driving circuit 200 is connected with the PWM signal output end, the output end of the switching tube driving circuit 200 is connected with the grid electrode of the switching tube Q1, the source electrode of the switching tube Q1 is connected with the output end of the LED load 300, and the drain electrode of the switching tube Q1 is connected with the grounding end.
In practical application, the voltage-stabilizing boost circuit 100 boosts the power supply voltage output by the output end of the power supply circuit 500, so that the boosted power supply voltage meets the requirement of the LED load 300, the boosted power supply voltage is delivered to the LED load 300, the resistor of the potentiometer VR is regulated through the arrangement of the potentiometer VR, so that the current flowing through the LED load 300 is regulated, that is, the regulation of the LED current is realized, the LED current reaches the rated current of the LED load 300, the effect of constant voltage and constant current driving of the LED load 300 is realized, the LED load 300 is driven by the constant voltage, the LED current ripple is controlled in a smaller range, the output average current of the LED load 300 can reach the maximum current of the LED load 300, the brightness of the LED load 300 can reach the highest, the switching tube Q1 adopts an N-channel MOS (Metal Oxide Semiconductor FIELD EFFECT Transistor, a metal oxide semiconductor field effect Transistor) tube, the output end of the PWM signal is connected through the input end of the switching tube driving circuit 200, the grid electrode of the switching tube Q1 is connected, the PWM signal is controlled by the output end of the switching tube driving circuit 200, the switching tube 300 can be controlled by the PWM signal, the switching tube 300 can be controlled by the switching tube, the LED load 300 can be controlled by the switching on and off the LED load 300, the light can reach the high-off frequency, even when the LED load 300 has high brightness, and the light can reach the brightness, and the high-level can reach the requirements of the light level, and can reach the high brightness, and can reach the high level, and can reach the high brightness, and the brightness, and can reach the high brightness, and can and high quality, and high quality.
Further, as shown in fig. 1, the method further includes: a voltage stabilizing circuit 400; an input end of the voltage stabilizing circuit 400 is connected with an output end of the power supply circuit 500, and an output end of the voltage stabilizing circuit 400 is connected with the voltage stabilizing type booster circuit 100 and the switching tube driving circuit 200. In practical application, the input end of the voltage stabilizing circuit 400 is connected to the output end of the power supply circuit 500, and is used for providing auxiliary voltage to the voltage stabilizing boost circuit 100 and the switching tube driving circuit 200, and in this embodiment, the auxiliary voltage is 12V.
Further, as shown in fig. 2, the voltage stabilizing type booster circuit 100 includes; a first diode D1, a first inductance L1, a first capacitance C1, a fourth capacitance C4, a fifth capacitance C5, an eighth resistance R8, a ninth resistance R9, a tenth resistance R10, an eleventh resistance R11, and a switching circuit 101;
The first end of the first inductor L1 is used as the input end of the voltage-stabilizing boost circuit 100 and is connected with the output end of the power circuit 500, the first end of the first inductor L1 is also connected with the ground end through a first capacitor C1, the other end of the first inductor L1 is connected with the anode of a first diode D1, the cathode of the first diode D1 is used as the output end of the voltage-stabilizing boost circuit 100 and is connected with the input end of the LED load 300, the cathode of the first diode D1 is also connected with the ground end through a fifth capacitor C5, and the cathode of the first diode D1 is also connected with the ground end through an eleventh resistor R11;
The input end of the switch circuit 101 is connected with the output end of the power circuit 500, the output end of the switch circuit is connected with the cathode of the first diode D1, and the feedback input end of the switch circuit is connected with the cathode of the first diode D1 through a ninth resistor R9;
The first end of the eighth resistor R8 is connected to the cathode of the first diode D1 through the tenth resistor R10 and the fourth capacitor C4 in sequence, the first end of the eighth resistor R8 is further connected to the cathode of the first diode D1 through the ninth resistor R9, and the second end of the eighth resistor R8 is used as the control end of the voltage stabilizing boost circuit 100 and is connected to the ground end through the potentiometer VR.
In this embodiment, through the arrangement of the first capacitor C1, the output end of the power supply circuit 500 is filtered, when the switch circuit 101 is closed, the first diode D1 is reverse biased, the current on the first inductor L1 is continuously increased, when the switch circuit 101 is opened, the first inductor L1 can enable the current to continue flowing, the capacitor starts to charge, through continuously opening and closing the switch circuit 101, a voltage higher than the power supply voltage is received on the LED load 300, the boost of the power supply voltage is realized, in this embodiment, the output voltage is controlled by controlling the on time of the switch circuit 101, so as to realize constant voltage driving of the LED load 300, in this embodiment, the adjustment of the LED current is realized by adjusting the size of the resistor through the potentiometer VR, and the LED current reaches the rated current.
Further, as shown in fig. 2, the switching circuit 101 includes; the MOS transistor driving circuit comprises a first chip U1, a MOS transistor Q2, a second capacitor C2, a third capacitor C3, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a MOS transistor driving circuit 102; the serial numbers 1-8 around the first chip U1 in fig. 2 represent the first pin, the second pin, the third pin, the fourth pin, the fifth pin, the sixth pin, the seventh pin, and the eighth pin of the first chip U1, respectively;
The first pin of the first chip U1 is connected with the grounding end through a second capacitor C2, the second pin is connected with the output end of the power circuit 500 through a second resistor R2, the seventh pin is connected with the grounding end, the eighth pin is connected with the grid electrode of the MOS tube Q2 through a fifth resistor R5, the eighth pin is also connected with the source electrode of the MOS tube Q2, the ninth pin is connected with the input end of the MOS tube driving circuit 102, the tenth pin is connected with the grounding end through a third capacitor C3, and the tenth pin is also connected with the output end of the power circuit 500 through a third resistor R3;
the output end of the MOS tube driving circuit 102 is connected with the grid electrode of the MOS tube Q2, the source electrode of the MOS tube Q2 is connected with the grounding end through the sixth resistor R6, and the drain electrode of the MOS tube Q2 is used as the output end of the switching circuit 101 to be connected with the anode of the first diode D1;
the first end of the fourth resistor R4 is connected to the fifth pin of the first chip U1, and the second end of the fourth resistor R4 is connected to the cathode of the first diode D1 through the ninth resistor R9 as the feedback input end of the switch circuit 101.
In this embodiment, the first chip U1 adopts a DC-DC boost constant voltage driving chip of Hi8000 type, in other embodiments, the first chip U1 can adopt DC-DC boost constant voltage driving chips of other types, the output end of the power circuit 500 transmits an enabling signal to the first chip U1 after passing through the second resistor R2, the output end of the power circuit 500 provides a working voltage to the first chip U1 after passing through the third resistor R3, the ninth pin of the first chip U1 sends a driving signal to the MOS transistor driving circuit 102, so as to realize closing or opening of the MOS transistor Q2 through the MOS transistor driving circuit 102, thereby realizing control of closing and opening of the switch circuit 101, and through the arrangement of the MOS transistor driving circuit 102, when the driving signal is for driving the MOS transistor Q2 to be closed, enough driving capability can be provided to enable the MOS transistor Q2 to be closed, that is, so that the MOS transistor Q2 is turned on.
Further, as shown in fig. 2, the MOS transistor driving circuit 102 includes: the second chip U2, the sixth capacitor C6 and the seventh resistor R7; the reference numbers 1-5 around the second chip U2 in fig. 2 represent the first pin, the second pin, the third pin, the fourth pin, and the fifth pin of the second chip U2, respectively;
The first pin of the second chip U2 is used as an input end of the MOS transistor driving circuit 102 and connected to a ninth pin of the first chip U1, the second pin thereof is connected to a ground end, the third pin thereof is connected to a fourth pin thereof, the fifth pin thereof is connected to an auxiliary voltage, and the fifth pin thereof is also connected to the ground end through a sixth capacitor C6;
The first end of the seventh resistor R7 is connected to the fourth pin of the second chip U2, and the second end thereof is connected to the gate of the MOS transistor Q2 as the output end of the MOS transistor driving circuit 102.
In this embodiment, the second chip U2 adopts a single-channel low-side gate driver of the sdh21697 model, in other embodiments, the second chip U2 may adopt a gate driver of another model, the first pin of the second chip U2, that is, the signal input end is used for receiving the driving signal sent by the first chip U1, and the third pin and the fourth pin of the second chip U2 are used as signal output ends, so that sufficient driving current can be provided to the gate of the MOS transistor Q2 through the seventh resistor R7 to drive the MOS transistor Q2 to be turned on.
Further, the first diode D1 is a first TVS (TRANSIENT VOLTAGE SUPPRESSOR, transient voltage suppression) diode; an anode of the first TVS diode is connected with a drain electrode of the MOS tube Q2, and a cathode of the first TVS diode is connected with an input end of the LED load 300.
In this embodiment, the first TVS diode is provided to protect the circuit, and when the two ends of the first TVS diode are subjected to the transient high energy impact, the impedance of the first TVS diode is suddenly reduced at a very high speed, and a large current is absorbed, so that the voltage between the two ends of the first TVS diode is clamped to a predetermined value, thereby ensuring that the following circuit elements are protected from being damaged by the transient high energy impact, that is, the LED load 300 is prevented from being damaged by the transient high energy impact.
Further, as shown in fig. 3, the switching tube driving circuit 200 includes: the third chip U3, the seventh capacitor C7, the twelfth resistor R12, the thirteenth resistor R13, the fourteenth resistor R14 and the fifteenth resistor R15; the serial numbers 1-5 around the third chip U3 in fig. 3 represent the first pin, the second pin, the third pin, the fourth pin, and the fifth pin of the third chip U3, respectively;
A first end of the fifteenth resistor R15 is connected to the PWM signal output end as an input end of the switching tube driving circuit 200, and a second end thereof is connected to the first pin of the third chip U3;
The second pin of the third chip U3 is connected with the grounding end, the third pin of the third chip U3 is connected with the fourth pin of the third chip U3, the fifth pin of the third chip U3 is connected with the auxiliary voltage, and the fifth pin of the third chip U3 is also connected with the grounding end through a seventh capacitor C7;
The first end of the thirteenth resistor R13 is connected to the third pin of the third chip U3, the second end thereof is connected to the gate of the switching tube Q1 as the output end of the switching tube driving circuit 200, and the second end thereof is also connected to the ground end through the twelfth resistor R12.
In this embodiment, the third chip U3 may use a gate driver of the same type as the second chip U2, in other embodiments, the third chip U3 may use a gate driver of a different type than the second chip U2, the first pin of the third chip U3, that is, the signal input end, is used for receiving the PWM signal, and the third pin and the fourth pin of the third chip U3 are used as signal output ends, and can provide enough driving current to the gate of the switching tube Q1 through the thirteenth resistor R13 to drive the switching tube Q1 to be turned on, that is, the on and off of the switching tube Q1 is controlled through the PWM signal, and the on time of the switching tube Q1 is controlled, which in turn controls the magnitude of the output average current of the LED load 300, so as to realize brightness control of the LED load 300.
Further, as shown in fig. 4, the voltage stabilizing circuit 400 includes: the fourth chip U4, the second inductor L2, the eighth capacitor C8, the ninth capacitor C9, the tenth capacitor C10, the eleventh capacitor C11, the twelfth capacitor C12, the thirteenth capacitor C13, the sixteenth resistor R16, the seventeenth resistor R17, the eighteenth resistor R18, the nineteenth resistor R19, and the twentieth resistor R20; the serial numbers 1-8 around the fourth chip U4 in fig. 4 represent the first pin, the second pin, the third pin, the fourth pin, the fifth pin, the sixth pin, the seventh pin, and the eighth pin of the fourth chip U4, respectively;
The seventh pin of the fourth chip U4 is used as an input end of the voltage stabilizing circuit 400 and connected to the output end of the power circuit 500, the eighth pin thereof is connected to the first pin thereof through a twelfth capacitor C12, the second pin thereof is connected to the seventh pin thereof through a sixteenth resistor R16, the second pin thereof is also connected to the ground end sequentially through a sixteenth resistor R16 and a seventeenth resistor R17, the third pin thereof is connected to the ground end sequentially through a tenth capacitor C10 and an eighteenth resistor R18, the third pin thereof is also connected to the ground end through an eleventh capacitor C11, the fourth pin thereof is connected to the ground end through a twentieth resistor R20, the fifth pin thereof and the ninth pin thereof are connected to the ground end, and the sixth pin thereof is connected to the ground end through a seventeenth resistor R17;
The first end of the second inductor L2 is connected to the first pin of the fourth chip U4, the first end thereof is further connected to the cathode of the second diode D2, the second end thereof is used as the output end of the voltage stabilizing circuit 400 to be connected to the voltage stabilizing boost circuit 100 and the switching tube driving circuit 200, the second end thereof is further connected to the ground end with a thirteenth capacitor C13, the second end thereof is further connected to the fourth pin of the fourth chip U4 through a nineteenth resistor R19, and the anode D2 of the second diode is connected to the ground end.
In this embodiment, the fourth chip U4 may be a voltage stabilizing chip, the second end of the second inductor L2 is connected to the fifth pin of the second chip U2, the second end of the second inductor L2 is further connected to the fifth pin of the third chip U3, and through the arrangement of the voltage stabilizing circuit 400, the voltage stabilizing circuit is used to provide 12V voltage for the second chip U2 and the third chip U3, that is, provide auxiliary voltage for the voltage stabilizing voltage boosting circuit 100 and the switching tube driving circuit 200, so that the second chip U2 and the third chip U3 can work normally, and in other embodiments, the magnitude of the auxiliary voltage provided by the voltage stabilizing circuit 400 can be increased or decreased according to the working voltages required by the second chip U2 and the third chip U3.
Further, the second diode D2 is a second TVS diode; an anode of the second TVS diode is connected with a grounding end, and a cathode of the second TVS diode is connected with a first end of the second inductor L2. In this embodiment, the circuit is protected by the second TVS diode.
Further, the LED load 300 includes: a plurality of light emitting diodes (LED 1, LED 2..ledn); the LEDs are sequentially connected in series to form an LED string, the anode of the LED string is used as the input end of the LED load 300 to be connected with the output end of the voltage stabilizing type booster circuit 100, and the cathode of the LED string is used as the output end of the LED load 300 to be connected with the drain electrode of the switching tube Q1.
In this embodiment, the plurality of light emitting diodes are serially connected in turn to form an LED string, that is, the cathode of the first light emitting diode LED1 is connected to the anode of the second light emitting diode LED2, the cathode of the second light emitting diode LED2 is connected to the anode of the third light emitting diode, and so on, until the cathode of the last light emitting diode is connected to the anode of the last light emitting diode LEDn to form an LED string, the anode of the first light emitting diode is used as the anode led+ of the LED string and is connected to the cathode of the first diode D1, and the cathode of the last light emitting diode is used as the cathode LED of the LED string and is connected to the drain of the switching tube Q1.
According to the LED driving circuit disclosed by the embodiment of the utility model, the voltage-stabilizing type booster circuit 100 boosts the power supply voltage output by the output end of the power supply circuit 500, so that the boosted power supply voltage meets the requirements of the LED load 300, the resistor of the potentiometer VR is regulated through the arrangement of the potentiometer VR to realize the regulation of the current flowing through the LED load 300, the LED current reaches the rated current of the LED load 300, the effect of constant-voltage constant-current driving of the LED load 300 is realized, the LED load 300 is driven by constant voltage, the LED current ripple is controlled in a smaller range, the output average current of the LED load 300 can reach the maximum current of the LED load 300, the brightness of the LED load 300 can reach the highest, the input end of the switching tube driving circuit 200 is connected with the PWM signal output end, the switching tube driving circuit 200 is controlled through the PWM signal, so that the on-off of the switching tube Q1 is controlled, the frequency of the PWM signal can reach higher frequency, even if the LED load 300 is low-brightness, the LED load 300 can be prevented from generating stripe light under the lens of a high-definition camera, and the camera is suitable for severe lighting requirements of a theatre, and the like.
The above examples are also not an exhaustive list based on the utility model, and there may be a number of other embodiments not listed. Any substitutions and modifications made without departing from the spirit of the utility model are within the scope of the utility model.
Claims (10)
- An led driving circuit, comprising: the LED driving circuit comprises a voltage stabilizing type booster circuit, a potentiometer, a switching tube driving circuit and an LED load; the input end of the voltage-stabilizing type booster circuit is connected with the output end of the power supply circuit, the output end of the voltage-stabilizing type booster circuit is connected with the input end of the LED load, the control end of the voltage-stabilizing type booster circuit is connected with the grounding end through the potentiometer, the input end of the switching tube driving circuit is connected with the PWM signal output end, the output end of the switching tube driving circuit is connected with the grid electrode of the switching tube, the source electrode of the switching tube is connected with the output end of the LED load, and the drain electrode of the switching tube is connected with the grounding end.
- 2. The LED driving circuit of claim 1, further comprising: a voltage stabilizing circuit; the input end of the voltage stabilizing circuit is connected with the output end of the power supply circuit, and the output end of the voltage stabilizing circuit is connected with the voltage stabilizing type boosting circuit and the switching tube driving circuit.
- 3. The LED driving circuit of claim 1, wherein the voltage stabilizing boost circuit comprises: a first diode, a first inductor, a first capacitor, a fourth capacitor, a fifth capacitor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor and a switch circuit;the first end of the first inductor is used as the input end of the voltage-stabilizing type booster circuit and is connected with the output end of the power supply circuit, the first end of the first inductor is also connected with the grounding end through the first capacitor, the other end of the first inductor is connected with the anode of the first diode, the cathode of the first diode is used as the output end of the voltage-stabilizing type booster circuit and is connected with the input end of the LED load, the cathode of the first diode is also connected with the grounding end through the fifth capacitor, and the cathode of the first diode is also connected with the grounding end through the eleventh resistor;The input end of the switching circuit is connected with the output end of the power supply circuit, the output end of the switching circuit is connected with the cathode of the first diode, and the feedback input end of the switching circuit is connected with the cathode of the first diode through a ninth resistor;The first end of the eighth resistor is connected with the cathode of the first diode through the tenth resistor and the fourth capacitor in sequence, the first end of the eighth resistor is also connected with the cathode of the first diode through the ninth resistor, and the second end of the eighth resistor is used as the control end of the voltage stabilizing type booster circuit and is connected with the grounding end through the potentiometer.
- 4. The LED driving circuit of claim 3, wherein the switching circuit comprises: the MOS transistor comprises a first chip, an MOS transistor, a second capacitor, a third capacitor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and an MOS transistor driving circuit;The first pin of the first chip is connected with the grounding end through a second capacitor, the second pin is connected with the output end of the power supply circuit through a second resistor, the seventh pin is connected with the grounding end, the eighth pin is connected with the grid electrode of the MOS tube through a fifth resistor, the eighth pin is also connected with the source electrode of the MOS tube, the ninth pin is connected with the input end of the MOS tube driving circuit, the tenth pin is connected with the grounding end through a third capacitor, and the tenth pin is also connected with the output end of the power supply circuit through a third resistor;The output end of the MOS tube driving circuit is connected with the grid electrode of the MOS tube, the source electrode of the MOS tube is connected with the grounding end through the sixth resistor, and the drain electrode of the MOS tube is used as the output end of the switching circuit to be connected with the anode of the first diode;The first end of the fourth resistor is connected with the fifth pin of the first chip, the second end of the fourth resistor is connected with the cathode of the first diode through the ninth resistor as a feedback input end of the switching circuit.
- 5. The LED driving circuit of claim 4, wherein the MOS transistor driving circuit comprises: the second chip, the sixth capacitor and the seventh resistor;The first pin of the second chip is used as an input end of the MOS tube driving circuit to be connected with a ninth pin of the first chip, the second pin of the second chip is connected with a grounding end, the third pin of the second chip is connected with a fourth pin of the second chip, the fifth pin of the second chip is connected with auxiliary voltage, and the fifth pin of the second chip is also connected with the grounding end through a sixth capacitor;And the first end of the seventh resistor is connected with the fourth pin of the second chip, and the second end of the seventh resistor is used as the output end of the MOS tube driving circuit and is connected with the grid electrode of the MOS tube.
- 6. The LED driving circuit of claim 3, wherein the first diode is a first TVS diode; and the anode of the first TVS diode is connected with the drain electrode of the MOS tube, and the cathode of the first TVS diode is connected with the input end of the LED load.
- 7. The LED driving circuit according to any one of claims 1 to 6, wherein the switching tube driving circuit includes: a third chip, a seventh capacitor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor and a fifteenth resistor;The first end of the fifteenth resistor is used as the input end of the switching tube driving circuit to be connected with the PWM signal output end, and the second end of the fifteenth resistor is connected with the first pin of the third chip;The second pin of the third chip is connected with the grounding end, the third pin of the third chip is connected with the fourth pin of the third chip, the fifth pin of the third chip is connected with the auxiliary voltage, and the fifth pin of the third chip is also connected with the grounding end through a seventh capacitor;The first end of the thirteenth resistor is connected with the third pin of the third chip, the second end of the thirteenth resistor is used as the output end of the switching tube driving circuit to be connected with the grid electrode of the switching tube, and the second end of the thirteenth resistor is also connected with the grounding end through the twelfth resistor.
- 8. The LED driving circuit of claim 2, wherein the voltage stabilizing circuit comprises: a fourth chip, a second inductor, a second diode, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, and a twentieth resistor;The seventh pin of the fourth chip is used as an input end of the voltage stabilizing circuit and is connected with an output end of the power circuit, the eighth pin of the fourth chip is connected with the first pin of the fourth chip through a twelfth capacitor, the second pin of the fourth chip is connected with the seventh pin of the fourth chip through a sixteenth resistor, the second pin of the fourth chip is also connected with a grounding end through a sixteenth resistor and a seventeenth resistor in sequence, the third pin of the fourth chip is connected with the grounding end through a tenth capacitor and an eighteenth resistor in sequence, the third pin of the third chip is also connected with the grounding end through an eleventh capacitor, the fourth pin of the fourth chip is connected with the grounding end through a twentieth resistor, the fifth pin of the fourth chip and the ninth chip are connected with the grounding end, and the sixth pin of the fourth chip is connected with the grounding end through the seventeenth resistor;The first end of the second inductor is connected with the first pin of the fourth chip, the first end of the second inductor is also connected with the cathode of the second diode, the second end of the second inductor is used as the output end of the voltage stabilizing circuit to be connected with the voltage stabilizing type voltage boosting circuit and the switching tube driving circuit, the second end of the second inductor is also connected with the grounding end through a thirteenth capacitor, the second end of the second inductor is also connected with the fourth pin of the fourth chip through a nineteenth resistor, and the anode of the second diode is connected with the grounding end.
- 9. The LED driving circuit of claim 8, wherein the second diode is a second TVS diode; and the anode of the second TVS diode is connected with the grounding end, and the cathode of the second TVS diode is connected with the first end of the second inductor.
- 10. The LED driving circuit of any of claims 1-6, wherein the LED load comprises: a plurality of light emitting diodes; the LEDs are sequentially connected in series to form an LED string, the anode of the LED string is used as the input end of the LED load to be connected with the output end of the voltage stabilizing type booster circuit, and the cathode of the LED string is used as the output end of the LED load to be connected with the drain electrode of the switching tube.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322959830.4U CN221531727U (en) | 2023-11-01 | 2023-11-01 | LED driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202322959830.4U CN221531727U (en) | 2023-11-01 | 2023-11-01 | LED driving circuit |
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| CN221531727U true CN221531727U (en) | 2024-08-13 |
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