A low power consumption constant current start LED driver power supply

Abstract

The invention discloses a low-power consumption constant-current starting LED driving power supply, comprising a DC power supply module, a flyback power supply module, a control module, a constant-current starting module, an auxiliary power supply module, a switch switching module and a dimming module; the DC power supply module is used for converting an AC input into a DC bus voltage; the power input end and the power output end of the flyback power supply module are respectively connected to the DC bus voltage and an LED; the power end of the control module is used for receiving the starting voltage, the signal receiving end thereof is used for receiving an external signal, the signal output end thereof is connected to the driving end of the flyback power supply module and controls the on-off of the flyback power supply module; the power input end of the constant-current starting module is connected to the DC bus voltage, and the power output end thereof is connected to the power end of the control module; the switch switching module is used for pulling down the voltage of the first control end to turn off the constant-current starting module when the flyback power supply module is started, thereby achieving low power consumption and fast starting.

Description

Technical Field

[0001] The invention relates to the technical field of LED power supplies, and in particular to a low-power consumption constant-current starting LED driving power supply. Background Art

[0002] As people's living standards improve, their requirements for quality of life are getting higher and higher. In the field of lighting, LED lamps are widely used due to their energy-saving and durability characteristics.

[0003] However, most of the current LED driver power supplies power the control module during startup by connecting several resistors with relatively large resistance to the DC bus voltage and then connecting them to the power supply end of the control module. However, when the DC bus voltage is full voltage input, the startup speed of the LED driver power supply will be affected; when the input voltage is large, the input current is large and the startup speed is fast, and when the input voltage is small, the input current is small and the startup speed is slow; if under the same input voltage, the startup speed can be increased by reducing the resistance value of the resistor connected to the DC bus voltage, but when the resistance value of the resistor is reduced, the power consumption on the resistor will increase, which will affect the standby power consumption.

[0004] In summary, the LED driving power supply in the prior art still needs to be further improved. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned defects or problems existing in the background technology and provide a low-power consumption constant current starting LED driving power supply to achieve low power consumption and fast startup.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A low-power consumption constant current start LED driving power supply, comprising a DC power supply module, a flyback power supply module, a control module, a constant current start module, an auxiliary power supply module and a switch switching module; the DC power supply module is used to convert AC input into a DC bus voltage output; the flyback power supply module comprises a power input terminal, a driving terminal and a power output terminal; the power input terminal and the power output terminal are respectively connected to the DC bus voltage and the power input terminal of the LED; the control module comprises a power supply terminal, a signal receiving terminal and a signal output terminal; the power supply terminal is used to receive a start voltage; the signal receiving terminal is used to receive an external signal; the signal output terminal is connected to the driving terminal of the flyback power supply module And according to the external signal, a control signal for controlling the start and stop of the flyback power supply module is output; the constant current starting module includes a power input terminal, a power output terminal and a first control terminal; its power input terminal is connected to the DC bus voltage; its power output terminal is connected to the power terminal of the control module; the input terminal of the auxiliary power supply module is connected to the flyback power supply module, and its output terminal outputs an auxiliary voltage when the flyback power supply module is started; the input terminal of the switch switching module is connected to the output terminal of the auxiliary power supply module, and its output terminal is connected to the first control terminal of the constant current starting module, and is used to pull down the voltage of the first control terminal of the constant current starting module to shut down the constant current starting module when the flyback power supply module is started.

[0008] Furthermore, the switch switching module includes a first resistor, a second resistor and a first transistor; one end of the first resistor serves as an input end of the switch switching module, and the other end thereof is connected to one end of the second resistor; the other end of the second resistor is grounded and connected to the emitter of the first transistor; the base of the first transistor is connected between the first resistor and the second resistor, and the collector thereof serves as an output end of the switch switching module; when the flyback power supply module is started, the first transistor is turned on.

[0009] Furthermore, the constant current starting module includes a voltage divider circuit and a constant current circuit; the input end of the voltage divider circuit serves as the power input end of the constant current starting module, and the output end thereof is connected to the input end of the constant current circuit; the constant current circuit includes a first MOS tube, a first voltage stabilizing diode, a third resistor, a first diode, a charging capacitor, a fourth resistor, a fifth resistor, a first capacitor, a second voltage stabilizing diode and a second diode; the drain of the first MOS tube serves as the input end of the constant current circuit and is connected to the cathode of the first voltage stabilizing diode; the anode of the first voltage stabilizing diode is connected to the cathode of the first diode through the third resistor; the anode of the first diode is connected to the positive electrode of the charging capacitor and serves as the power output end of the constant current starting module; the negative electrode of the charging capacitor is grounded; the source of the first MOS tube is connected to the cathode of the first diode, and is also connected to the positive electrode of the charging capacitor and the gate of the first MOS tube through the fourth resistor and the fifth resistor respectively; the gate of the first MOS tube is connected to the cathode of the second voltage stabilizing diode as the first control end of the constant current starting module; the anode of the second voltage stabilizing diode is connected to the positive electrode of the charging capacitor through the first capacitor; and the second diode is connected in parallel with the first capacitor.

[0010] Furthermore, the voltage divider circuit includes a sixth resistor, a seventh resistor, a second MOS tube, an eighth resistor, a ninth resistor and a tenth resistor; one end of the sixth resistor is connected to the DC bus voltage as the input end of the voltage divider circuit, and the other end thereof is connected to the drain of the second MOS tube through the seventh resistor; the gate of the second MOS tube is connected to the anode of the first voltage zener diode; the eighth resistor is connected between the gate and the source of the second MOS tube; the source of the second MOS tube is connected to the cathode of the first voltage zener diode; and the tenth resistor is connected between the drain and the source of the second MOS tube.

[0011] Furthermore, the control module also includes an electrical signal sampling end; the flyback power supply module includes a first absorption circuit, a third MOS tube, a third capacitor, a transformer, a rectifier circuit, a second absorption circuit, a filter circuit, a first common mode inductor and a current ripple elimination circuit; the transformer includes a first primary winding, a second primary winding and a secondary winding; the non-same-name end of the first primary winding is connected to the DC bus voltage, and its same-name end is connected to the drain of the third MOS tube; the source of the third MOS tube is connected to the electrical signal sampling end of the control module, and its gate serves as the driving end of the flyback power supply module; the third capacitor is connected across the drain and source of the third MOS tube; the input end of the first absorption circuit is connected to the non-same-name end of the first primary winding, and its output end is connected to the third MOS tube. The same-name end of a primary winding is connected; the same-name end of a second primary winding is connected to the input end of an auxiliary power supply module, and its non-same-name end is grounded; the same-name end of a secondary winding is connected to the input end of a rectifier circuit and a second absorption circuit, and its non-same-name end is grounded; the output end of the second absorption circuit is connected to the output end of the rectifier circuit; the first common-mode inductor is composed of a first coil and a second coil; the non-same-name end of the first coil is connected to the output end of the rectifier circuit, and its same-name end is connected to the input end of a current ripple elimination circuit; the non-same-name end of the second coil is connected to the non-same-name end of a secondary winding, and its same-name end is grounded; a filter circuit is connected across the same-name end and the non-same-name end of the secondary winding; and the output end of the current ripple elimination circuit serves as the power output end of the flyback power supply module.

[0012] Further, the control module includes a first chip, a twenty-seventh resistor, a twenty-eighth resistor, a twenty-ninth resistor, a thirtieth resistor, a thirty-first resistor, a thirty-second resistor, a thirty-third resistor, a thirty-fourth resistor, a thirty-fifth resistor, a thirty-sixth resistor, a thirty-seventh resistor, a thirty-eighth resistor, a thirty-ninth resistor, a seventh capacitor, an eighth capacitor, a ninth capacitor and a seventh diode; the first pin of the first chip is grounded through the eighth capacitor and the thirtieth resistor; the second pin thereof is grounded through the thirty-first resistor and the thirty-second resistor respectively; the third pin thereof is grounded through the thirty-sixth resistor, the thirty-seventh resistor, the thirty-eighth resistor and the thirty-ninth resistor respectively , and is also connected to the gate of the third MOS tube and the anode of the seventh diode respectively through the thirty-fourth resistor; its fourth pin is grounded; its fifth pin is connected to the cathode of the seventh diode; its sixth pin is connected to the positive electrode of the charging capacitor through the twenty-seventh resistor; its seventh pin is grounded through the seventh capacitor; its eighth pin is connected to the external signal through the twenty-ninth resistor; the twenty-eighth resistor is connected between the sixth pin and the eighth pin of the first chip; the thirty-fifth resistor is connected in parallel with the fourth diode; the thirty-third resistor is connected between the input end of the auxiliary power module and the second pin of the first chip; and the ninth capacitor is connected between the sixth pin of the first chip and the ground.

[0013] Furthermore, the auxiliary power supply module includes an eighth diode, a tenth capacitor, an eleventh capacitor, a fortieth resistor, a third voltage-stabilizing diode, a second triode and a ninth diode; the anode of the eighth diode is connected to the same-name end of the second primary winding as the input end of the auxiliary power supply module, and its cathode is connected to the collector of the second triode; one end of the eleventh capacitor is connected to the cathode of the eighth diode, and the other end is connected to the non-same-name end of the second primary winding; the tenth capacitor is connected in parallel with the eleventh capacitor; the fortieth resistor is connected between the collector and the base of the second triode; the cathode of the third voltage-stabilizing diode is connected to the base of the second triode, and its anode is connected to the non-same-name end of the second primary winding; the emitter of the second triode is connected to the anode of the ninth diode as the output end of the auxiliary power supply module; the cathode of the ninth diode is connected to the power output end of the constant current starting module.

[0014] Further, the DC power supply module includes a first fuse, a second fuse, a twelfth capacitor, a forty-first resistor, a forty-second resistor, a forty-third resistor, a forty-fourth resistor, a second common-mode inductor, a first varistor, a thirteenth capacitor, a rectifier bridge, a second varistor, a fourteenth capacitor, a fifteenth capacitor, a forty-fifth resistor and a first inductor; the second common-mode inductor is composed of a third coil and a fourth coil; the same-name end of the third coil is connected to the live wire of the AC input through the first fuse; the second fuse is connected in parallel with the first fuse; the same-name end of the fourth coil is connected to the neutral wire of the AC input; the twelfth capacitor is connected across the same-name ends of the third coil and the fourth coil, and is respectively connected in series with the forty-first resistor, the forty-fourth resistor and the forty-third resistor, the forty-fourth resistor connected in series with each other. The first varistor is connected in parallel with the thirteenth capacitor; the first varistor is connected between the non-same-name ends of the third coil and the fourth coil; the rectifier bridge stack includes a first input end, a second input end, a first output end and a second output end; the thirteenth capacitor is connected between the first input end and the second input end of the rectifier bridge stack; the non-same-name end of the third coil and the non-same-name end of the fourth coil are respectively connected to the first input end and the second output end of the rectifier bridge stack; the first varistor is connected in parallel with the thirteenth capacitor; the second varistor is connected between the first output end and the second output end of the rectifier bridge stack; the second output end of the rectifier bridge stack is grounded, and its first output end is connected to one end of the first inductor; the other end of the first inductor serves as the output end of the DC power supply module; the forty-fifth resistor is connected in parallel with the first inductor, and its two ends are grounded through the fourteenth capacitor and the fifteenth capacitor respectively.

[0015] Furthermore, it also includes an external driving module; the external driving module includes an external control signal input terminal, a power input terminal, a control signal output terminal, a forty-sixth resistor and a first optocoupler and a second optocoupler that cooperate with each other; the constant current starting module also includes a control signal input terminal; the source of the second MOS tube serves as the control signal input terminal of the constant current starting module; the external control signal input terminal is used to connect the external control signal, and is connected to the power input terminal of the external driving module through the first optocoupler and the forty-sixth resistor; one end of the second optocoupler is grounded, and the other end is connected to the gate of the second MOS tube as the control signal output terminal of the external driving module; when the external control signal is at a low level, the first optocoupler is turned on and linked to the second optocoupler; when the second optocoupler is turned on, the voltage of the gate of the second MOS tube is pulled down to turn off the second MOS tube.

[0016] Furthermore, it also includes a dimming module; the dimming module includes a pulse signal input terminal, a power input terminal, a pulse signal output terminal, a forty-ninth resistor, an eleventh diode, a fiftieth resistor, a fifty-first resistor, a third transistor, a third optocoupler and a fourth optocoupler; the pulse signal input terminal is used to connect an external PWM signal, and is connected to the anode of the eleventh diode through the forty-ninth resistor; the cathode of the eleventh diode is connected to the base of the third transistor; the base of the third transistor is connected to its emitter through the fiftieth resistor; the third optocoupler and the fourth optocoupler cooperate with each other and are bridged between the collector and emitter of the third transistor; the collector of the third transistor is connected to the power input terminal of the dimming module through the fifty-first resistor; the pulse signal output terminal of the dimming module is used to output an external signal; one end of the fourth optocoupler is grounded, and the other end is connected to the eighth pin of the first chip through the twenty-ninth resistor as the pulse signal output terminal of the dimming module.

[0017] From the above description of the present invention, it can be seen that compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. By setting a switch switching module between the output end of the auxiliary power supply module connected to the flyback power supply module and the first control end of the constant current starting module, the constant current starting module can be turned off when the flyback power supply module is started, so as to avoid the problem that the constant current starting module continues to work after the flyback power supply module is started, causing circuit loss and affecting the standby power consumption of the LED driving power supply; by setting the constant current starting module between the power supply end of the control module and the DC bus voltage, the power consumption of the LED driving power supply is avoided from being affected by the input DC bus voltage during high-voltage startup, and this setting improves the reliability of the circuit, is conducive to improving the startup speed of the LED driving power supply, and improves the user experience.

[0019] 2. By providing a specific circuit structure of the switch switching module, the constant current startup module can be turned off when the flyback power supply module is started to reduce power consumption and improve the stability of the circuit. When the flyback power supply module is started, the auxiliary power supply module supplies power to the switch switching module, so that the first transistor is turned on; since the emitter of the first transistor is grounded, and its collector is connected to the first control end of the control module; therefore, when the first transistor is turned on, the voltage of the first control end of the constant current startup module will be lowered to turn off the constant current startup module, thereby avoiding the problem of the constant current startup module continuing to work after the flyback power supply module is started, increasing circuit loss and standby power consumption.

[0020] 3. By providing a specific circuit structure of a constant current starting module, the power consumption of the LED driving power supply is not affected by the input DC bus voltage during high voltage starting, and the constant current starting module can improve the starting speed and current accuracy at different temperatures during high voltage starting of the LED driving power supply. When the DC bus voltage is input, the first MOS tube is turned on, and the current passes through the fourth resistor to charge the charging capacitor. When the charging capacitor is fully charged, the control module is started; by connecting the fifth resistor between the gate and the source of the first MOS tube, the power output end of the constant current starting module can be isolated from the gate of the first MOS tube, so as to provide a material basis for the switch switching module to control the on and off of the constant current starting module; by arranging the second zener diode and the second diode between the gate of the first MOS tube and the positive electrode of the rechargeable battery, the current accuracy at different temperatures is improved; when the temperature rises, since the PN junction inside the first MOS tube and the PN junction inside the second zener diode and the second diode are affected by the temperature, when the threshold of the conduction voltage of the first MOS tube decreases due to the influence of temperature, the forward voltages of the second diode and the zener diode will also decrease, and then offset each other to achieve the effect of improving the current accuracy at different temperatures; this arrangement is conducive to reducing losses and improving the reliability of the circuit.

[0021] 4. By setting a voltage divider circuit between the DC bus voltage and the input end of the constant current circuit, the DC bus voltage can drive the high-power first MOS tube to work after voltage division; wherein, when the DC bus voltage is input, the current passes through the sixth resistor and the sixth resistor in sequence to turn on the second MOS tube so that the first MOS tube is turned on; in addition, the setting of the first MOS tube also provides a material basis for the subsequent opening and closing of the circuit controlled by an external signal.

[0022] 5. The power supply of the LED is realized by providing a specific circuit structure of the flyback power supply module; wherein, the first absorption circuit and the second absorption circuit are used to absorb the peak voltage; the first common-mode inductor is used to eliminate common-mode interference; the current ripple elimination circuit is used to output low-frequency ripple to avoid the situation where the stroboscopic irritation to the eyes and the user experience are affected when there is a 50HZ power frequency ripple; this setting is conducive to improving the stability of the product.

[0023] 6. By providing a specific circuit structure of the control module, the control module can output a control signal for controlling the on / off of the flyback power supply and adjust the brightness of the output LED according to an external signal; wherein the first chip outputs a drive signal for controlling the on / off of the third MOS tube at its fifth pin according to the external signal received at its eighth pin to start the flyback power supply module.

[0024] 7. By providing a specific circuit structure of the auxiliary power supply module, the auxiliary power supply module can output an auxiliary voltage to power the control module and the switch switching module when the flyback power supply module is started; wherein, when the flyback power supply module is started, its second primary winding generates a voltage and the second transistor is turned on to output the auxiliary voltage.

[0025] 8. The specific circuit structure of the DC power supply module is provided so that the AC input can be converted into the DC bus voltage; wherein the forty-first resistor, the forty-second resistor, the forty-third resistor and the forty-fourth resistor are discharge resistors; the first fuse and the second fuse are used to prevent short circuits and protect the overall circuit; the twelfth capacitor helps conduction and radiation; the rectifier bridge stack is used to rectify the AC input; the first varistor is used for lightning protection; the second varistor is used for secondary lightning protection; the first inductor, the fourteenth capacitor and the fifteenth capacitor together constitute a π-type filter, which helps radiation and conduction.

[0026] 9. By setting up an external driving module, the external driving module can control the on and off of the LED driving power supply according to the signal received by its external control signal input terminal; wherein, when the external control signal input terminal receives a low level, the first optocoupler is turned on and the second optocoupler is linked; when the second optocoupler is turned on, the voltage of the gate of the second MOS tube is pulled down to turn off the second MOS tube.

[0027] 10. By setting up a dimming module, the control module can adjust the current of the LED to dim the light according to the external signal output by the dimming module; when a pulse signal is input to the pulse signal input end of the dimming module, the pulse signal controls the opening and closing of the third transistor, thereby controlling the opening and closing of the third optocoupler; when the control module is started, the external signal is input to the eighth pin of the first chip. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 This is a schematic diagram of module connections of a low-power constant-current start-up LED drive power supply according to an embodiment of the present invention;

[0030] Figure 2 A circuit schematic diagram of a DC power supply module according to an embodiment of the present invention;

[0031] Figure 3 A circuit schematic diagram of a switch switching module according to an embodiment of the present invention;

[0032] Figure 4 A circuit schematic diagram of a constant current starting module according to an embodiment of the present invention;

[0033] Figure 5 A circuit schematic diagram of a flyback power supply module, an auxiliary power supply module and a control module according to an embodiment of the present invention;

[0034] Figure 6 This is a circuit schematic diagram of the external driving module and the dimming module according to an embodiment of the present invention.

[0035] Description of main reference numerals:

[0036] Switching module 1, first resistor R1, second resistor R2, first transistor Q1;

[0037] Constant current starting module 2, third resistor R3, fourth resistor R4, fifth resistor R5, first MOS tube Q2, first voltage zener diode Z1, second voltage zener diode Z2, first diode D1, second diode D2, first capacitor C1, charging capacitor EC1;

[0038] A sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a second MOS transistor Q3, and a control signal input terminal P1;

[0039] Flyback power supply module 3, third MOS tube Q4, eleventh resistor R11, twelfth resistor R12, thirteenth resistor R13, fourteenth resistor R14, fifteenth resistor R15, sixteenth resistor R16, second capacitor C2, third diode D3, transformer T1, first primary winding TR1A, second primary winding TR1B, seventeenth resistor R17, eighteenth resistor R18, third capacitor C3, fourth diode D4, fifth diode D5, sixth diode D6, first electrolytic capacitor EC2, second electrolytic capacitor EC3, nineteenth resistor R19, first common mode inductor T2, second chip U2, fourth electrolytic capacitor EC4, twentieth resistor R20, twenty-first resistor R21, twenty-second resistor R22, twenty-third resistor R23, twenty-fourth resistor R24, twenty-fifth resistor R25, twenty-sixth resistor R26, fourth capacitor C4, fifth capacitor C5, sixth capacitor C6, fifth electrolytic capacitor EC5, fourth MOS tube Q5;

[0040] Control module 4, first chip U1, twenty-seventh resistor R27, twenty-eighth resistor R28, twenty-ninth resistor R29, thirtieth resistor R30, thirty-first resistor R31, thirty-second resistor R32, thirty-third resistor R33, thirty-fourth resistor R34, thirty-fifth resistor R35, thirty-sixth resistor R36, thirty-seventh resistor R37, thirty-eighth resistor R38, thirty-ninth resistor R39, seventh capacitor C7, eighth capacitor C8, ninth capacitor C9, seventh diode D7;

[0041] Auxiliary power module 5: an eighth diode D8, a tenth capacitor C10, an eleventh capacitor C11, a fortieth resistor R40, a second transistor Q6, a third voltage stabilizing diode Z3, an eighth diode D8, and a ninth diode D9;

[0042] DC power supply module 6, first fuse F1, second fuse F2, twelfth capacitor C12, forty-first resistor R41, forty-second resistor R42, forty-third resistor R43, forty-fourth resistor R44, second common mode inductor T3, first varistor RV1, rectifier bridge DB1, second varistor RV2, fourteenth capacitor C14, fifteenth capacitor C15, forty-fifth resistor R45, first inductor L1;

[0043] External driving module 7, first optical coupler PH1A, second optical coupler PH1B, forty-sixth resistor R46;

[0044] Dimming module 8, forty-ninth resistor R49, eleventh diode D11, fiftieth resistor R50, fifty-first resistor R51, third optical coupler PH2A, third transistor Q8, fourth optical coupler PH2B. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are preferred embodiments of the present invention and should not be regarded as excluding other embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] In the claims, description and the above-mentioned drawings of the present invention, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" etc. are for distinguishing different objects rather than for describing a specific order.

[0047] In the claims, specification and the above-mentioned drawings of the present invention, unless otherwise explicitly defined, directional words, such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise", etc., indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the specific protection scope of the present invention.

[0048] In the claims, specification and the above drawings of the present invention, unless otherwise clearly defined, if the term "fixed connection" or "fixed connection" is used, it should be understood in a broad sense, that is, any connection method without a displacement relationship and relative rotation relationship between the two, that is to say, including non-detachable fixed connection, detachable fixed connection, integrated connection and fixed connection through other devices or elements.

[0049] In the claims, description and drawings of the present invention, if the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to".

[0050] like Figure 1 As shown, the present invention discloses a low-power consumption constant current starting LED driving power supply, which includes a switch switching module 1, a constant current starting module 2, a flyback power supply module 3, a control module 4, an auxiliary power supply module 5, a DC power supply module 6, an external driving module 7 and a dimming module 8.

[0051] The DC power supply module 6 is used to convert the AC input into a DC bus voltage output. In the embodiment of the invention, the DC bus voltage is output on the BUS bus; the flyback power supply module 3 includes a power input terminal, a drive terminal and a power output terminal; its power input terminal and power output terminal are respectively connected to the DC bus voltage and the power input terminal of the LED.

[0052] The flyback power supply module 3 comprises a power input terminal, a driving terminal and a power output terminal; the power input terminal and the power output terminal thereof are respectively connected to the DC bus voltage and the power input terminal of the LED.

[0053] The control module 4 includes a power supply end, a signal receiving end, an electrical signal sampling end, and a signal output end; its power supply end is used to receive a starting voltage; its signal receiving end is used to receive an external signal; its signal output end is connected to the driving end of the flyback power supply module 3 and outputs a control signal for controlling the start and stop of the flyback power supply module 3 according to the external signal.

[0054] The constant current starting module 2 includes a power input terminal, a power output terminal, a first control terminal and a control signal input terminal P1; its power input terminal is connected to the DC bus voltage; and its power output terminal is connected to the power terminal of the control module 4.

[0055] The auxiliary power supply module 5 includes an input end and an output end; the input end is connected to the flyback power supply module 3; and the output end outputs an auxiliary voltage when the flyback power supply module 3 is started.

[0056] The switch switching module 1 includes an input end and an output end; its input is connected to the output end of the auxiliary power supply module 5; its output end is connected to the first control end of the constant current starting module 2, and is used to pull down the voltage of the first control end of the constant current starting module 2 to shut down the constant current starting module 2 when the flyback power supply module 3 is started.

[0057] The external driving module 7 includes an external control signal input terminal, a power input terminal and a control signal output terminal; its external control signal input terminal is used to connect an external control signal; its power input terminal is used to receive a power supply voltage; and its control signal output terminal is used to output high and low levels.

[0058] The dimming module 8 includes a pulse signal input terminal, a power input terminal and a pulse signal output terminal; the pulse signal input terminal is used to connect

[0059] like Figure 2 As shown, in an embodiment of the present invention, the DC power supply module 6 includes a first fuse F1, a second fuse F2, a twelfth capacitor C12, a forty-first resistor R41, a forty-second resistor R42, a forty-third resistor R43, a forty-fourth resistor R44, a second common-mode inductor T3, a first varistor RV1, a thirteenth capacitor C13, a rectifier bridge stack DB1, a second varistor RV2, a fourteenth capacitor C14, a fifteenth capacitor C15, a forty-fifth resistor R45 and a first inductor L1.

[0060] The second common-mode inductor T3 is composed of a third coil and a fourth coil; the same-name end of the third coil is connected to the live wire of the AC input through the first fuse F1; the second fuse F2 is connected in parallel with the first fuse F1; the same-name end of the fourth coil is connected to the neutral wire of the AC input; the twelfth capacitor C12 is connected between the same-name ends of the third coil and the fourth coil, and is respectively connected in parallel with the forty-first resistor R41 and the forty-fourth resistor R44 connected in series with each other and the forty-third resistor R43 and the forty-fourth resistor R44 connected in series with each other; the first varistor RV1 is connected between the non-same-name ends of the third coil and the fourth coil; the rectifier bridge DB1 includes a first input end, a second input end, a first output end and a second output end; the thirteenth capacitor C12 is connected between the same-name ends of the third coil and the fourth coil, and is respectively connected in parallel with the forty-first resistor R41 and the forty-fourth resistor R44 connected in series with each other and the forty-third resistor R43 and the forty-fourth resistor R44 connected in series with each other; the first varistor RV1 is connected between the non-same-name ends of the third coil and the fourth coil; the rectifier bridge DB1 includes a first input end, a second input end, a first output end and a second output end; Capacitor C13 is connected between the first input terminal and the second input terminal of the rectifier bridge stack DB1; the non-same-name end of the third coil and the non-same-name end of the fourth coil are respectively connected to the first input terminal and the second output terminal of the rectifier bridge stack DB1; the first varistor RV1 is connected in parallel with the thirteenth capacitor C13; the second varistor RV2 is connected between the first output terminal and the second output terminal of the rectifier bridge stack DB1; the second output terminal of the rectifier bridge stack DB1 is grounded, and its first output terminal is connected to one end of the first inductor L1; the other end of the first inductor L1 serves as the output end of the DC power supply module 6; the forty-fifth resistor R45 is connected in parallel with the first inductor L1, and its two ends are respectively grounded through the fourteenth capacitor C14 and the fifteenth capacitor C15.

[0061] like Figure 3 As shown, in an embodiment of the present invention, the switch switching module 1 includes a first resistor R1, a second resistor R2 and a first transistor Q1; one end of the first resistor R1 serves as an input end of the switch switching module 1, and the other end thereof is connected to one end of the second resistor R2; the other end of the second resistor R2 is grounded and connected to the emitter of the first transistor Q1; the base of the first transistor Q1 is connected between the first resistor R1 and the second resistor R2, and the collector thereof serves as an output end of the switch switching module 1; when the flyback power supply module 3 is started, the first transistor Q1 is turned on.

[0062] like Figure 4As shown, the constant current starting module 2 includes a voltage divider circuit and a constant current circuit; the input end of the voltage divider circuit serves as the power input end of the constant current starting module 2, and its output end is connected to the input end of the constant current circuit; in an embodiment of the present invention, the constant current circuit includes a first MOS tube Q2, a first voltage zener diode Z1, a third resistor R3, a first diode D1, a charging capacitor EC1, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a second voltage zener diode Z2 and a second diode D2. The drain of the first MOS tube Q2 is connected to the cathode of the first voltage stabilizing diode Z1 as the input end of the constant current circuit; the anode of the first voltage stabilizing diode Z1 is connected to the cathode of the first diode D1 through the third resistor R3; the anode of the first diode D1 is connected to the positive electrode of the charging capacitor EC1 and serves as the power output end of the constant current starting module 2; the negative electrode of the charging capacitor EC1 is grounded; the source of the first MOS tube Q2 is connected to the cathode of the first diode D1, and is also connected to the positive electrode of the charging capacitor EC1 and the gate of the first MOS tube Q2 through the fourth resistor R4 and the fifth resistor R5 respectively; the gate of the first MOS tube Q2 is connected to the cathode of the second voltage stabilizing diode Z2 as the first control end of the constant current starting module 2; the anode of the second voltage stabilizing diode Z2 is connected to the positive electrode of the charging capacitor EC1 through the first capacitor C1; the second diode D2 is connected in parallel with the first capacitor C1. The voltage divider circuit includes a sixth resistor R6, a seventh resistor R7, a second MOS tube Q3, an eighth resistor R8, a ninth resistor R9 and a tenth resistor R10; one end of the sixth resistor R6 is connected to the DC bus voltage as an input end of the voltage divider circuit, and the other end thereof is connected to the drain of the second MOS tube Q3 through the seventh resistor R7; the gate of the second MOS tube Q3 is connected to the anode of the first voltage zener diode Z1 as a control signal input end P1 of the constant current starting module 2; the eighth resistor R8 is connected between the gate and the source of the second MOS tube Q3; the source of the second MOS tube Q3 is connected to the cathode of the first voltage zener diode Z1; and the tenth resistor R10 is connected between the drain and the source of the second MOS tube Q3.

[0063] like Figure 5As shown, the flyback power supply module 3 includes a first absorption circuit, a third MOS tube Q4, a third capacitor C3, a transformer T1, a rectifier circuit, a second absorption circuit, a filter circuit, a first common mode inductor T2 and a current ripple elimination circuit. The transformer T1 includes a first primary winding, a second primary winding and a secondary winding; the non-same-name end of the first primary winding is connected to the DC bus voltage, and its same-name end is connected to the drain of the third MOS tube Q4; the source of the third MOS tube Q4 is connected to the electrical signal sampling end of the control module, and its gate serves as the driving end of the flyback power supply module 3; the third capacitor C3 is connected across the drain and source of the third MOS tube Q4; the input end of the first absorption circuit is connected to the non-same-name end of the first primary winding, and its output end is connected to the same-name end of the first primary winding; in the embodiment of the present invention, the first absorption circuit includes an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a third capacitor C3, a fourth capacitor C3, a fifth ... The fourteenth resistor R14, the fifteenth resistor R15, the sixteenth resistor R16, the second capacitor C2 and the third diode D3; one end of the eleventh resistor R11 is used as the input end of the first absorption resistor, and the other end thereof is connected to one end of the twelfth resistor R12; the other end of the twelfth resistor R12 is connected to the cathode of the third diode D3; the anode of the third diode D3 is used as the output end of the first absorption circuit; the thirteenth resistor R13 is connected in parallel with the eleventh resistor R11; the fourteenth resistor R14 is connected in parallel with the twelfth resistor R12; the second capacitor C2 is connected in parallel with the thirteenth resistor R13; the sixteenth resistor R16 is connected in parallel with the fifteenth resistor R15; the same-name end of the second primary winding is connected to the auxiliary The input end of the power module 5 is connected, and its non-same-name end is grounded; the same-name end of the secondary winding is connected to the input end of the rectifier circuit and the second absorption circuit, and its non-same-name end is grounded; the output end of the second absorption circuit is connected to the output end of the rectifier circuit; in an embodiment of the present invention, the rectifier circuit includes a fourth diode D4, a fifth diode D5 and a sixth diode D6; the anode of the fourth diode D4 is connected to the anode of the fifth diode D5 and the sixth diode D6 as the input end of the rectifier circuit, and its cathode is connected to the cathode of the fifth diode D5 and the sixth diode D6 as the output end of the rectifier circuit; in an embodiment of the present invention, the second absorption circuit includes a seventeenth resistor R17, a tenth resistor R21 and a sixth diode D3. Eighth resistor R18 and third capacitor C3; one end of the seventeenth resistor R17 is used as the input end of the second absorption circuit, and the other end thereof is connected to the cathode of the fourth diode D4 through the third capacitor C3; the eighteenth resistor R18 is connected in parallel with the seventeenth resistor R17; the first common mode inductor T2 is composed of a first coil and a second coil; the non-same-name end of the first coil is connected to the output end of the rectifier circuit, and its same-name end is connected to the input end of the current ripple elimination circuit; the non-same-name end of the second coil is connected to the non-same-name end of the secondary winding, and its same-name end is grounded; the filter circuit is connected across the same-name end and the non-same-name end of the secondary winding; the output end of the current ripple elimination circuit is used as the power output end of the flyback power supply module 3;In an embodiment of the present invention, the current ripple elimination circuit includes a second chip U2, a fourth electrolytic capacitor EC4, a twentieth resistor R20, a fourth capacitor C4, a fifth capacitor C5, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, a twenty-fourth resistor R24, a sixth capacitor C6, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a fifth electrolytic capacitor EC5 and a fourth MOS tube Q5; the fourth electrolytic capacitor EC4 is connected across the first coil and the same-name end of the second coil of the first common-mode inductor T2; one end of the twentieth resistor R20 serves as the input end of the current ripple elimination circuit, and the other end thereof is connected to the first pin of the second chip U2; the fourth capacitor C4 is connected between the first pin and the second pin of the second chip U2; the third pin of the second chip U2 is grounded through the fifth capacitor C5, and the fourth pin thereof is connected to one end of the twenty-first resistor R21; the other end of the twenty-first resistor R21 serves as the current ripple elimination circuit. The first power supply output terminal of the elimination circuit is connected to the negative power supply input terminal of the LED; the fifth pin of the second chip U2 is connected to the ground through the twenty-third resistor R23 and the twenty-fifth resistor R25 in sequence; the twenty-sixth resistor R26 is connected in parallel with the twenty-fifth resistor R25; the sixth pin of the second chip U2 is connected to the gate of the fourth MOS tube Q5 through the twenty-second resistor R22; the source of the fourth MOS tube Q5 is connected to the ground through the twenty-sixth resistor R26, and its drain is connected to the negative power supply input terminal of the LED and connected to the rectifier power supply input terminal of the LED through the fifth electrolytic capacitor EC5; the twenty-fourth resistor R24 ​​is connected in parallel with the fifth electrolytic capacitor EC5; in the embodiment of the present invention, the filter circuit includes the second electrolytic capacitor EC2, the third electrolytic capacitor EC3 and the nineteenth resistor R19; the positive electrode of the second electrolytic capacitor EC2 is used as the output terminal of the filter circuit, and its negative electrode is grounded; the third electrolytic capacitor EC3 and the nineteenth resistor R19 are both connected in parallel with the second electrolytic capacitor EC2. ;

[0064] like Figure 5As shown, the auxiliary power module 5 includes an eighth diode D8D8, a tenth capacitor C10, an eleventh capacitor C11, a fortieth resistor R40, a third voltage stabilizing diode Z3, a second triode Q6 and a ninth diode D9. The anode of the eighth diode D8D8 is connected to the same-name end of the second primary winding as the input end of the auxiliary power module 5, and its cathode is connected to the collector of the second triode Q6; one end of the eleventh capacitor C11 is connected to the cathode of the eighth diode D8D8, and the other end is connected to the non-same-name end of the second primary winding; the tenth capacitor C10 is connected in parallel with the eleventh capacitor C11; the fortieth resistor R40 is connected between the collector and the base of the second triode Q6; the cathode of the third voltage stabilizing diode Z3 is connected to the base of the second triode Q6, and its anode is connected to the non-same-name end of the second primary winding; the emitter of the second triode Q6 is connected to the anode of the ninth diode D9 as the output end of the auxiliary power module 5; the cathode of the ninth diode D9 is connected to the power output end of the constant current starting module 2.

[0065] like Figure 5 As shown, the control module 4 includes a first chip U1, a twenty-seventh resistor R27, a twenty-eighth resistor R28, a twenty-ninth resistor R29, a thirtieth resistor R30, a thirty-first resistor R31, a thirty-second resistor R33, a thirty-third resistor R33, a thirty-fourth resistor R34, a thirty-fifth resistor R35, a thirty-sixth resistor R36, a thirty-seventh resistor R37, a thirty-eighth resistor R38, a thirty-ninth resistor R39, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9 and a seventh diode D7; the first pin of the first chip U1 is grounded through the eighth capacitor C8 and the thirtieth resistor R30; its second pin is grounded through the thirty-first resistor R31 and the thirty-second resistor R33 respectively; its third pin is grounded through the thirty-sixth resistor R36, the thirty-seventh resistor R37, the thirty-eighth resistor R38, the thirty-ninth resistor R39, the seventh capacitor C7, the eighth capacitor C8, the ninth capacitor C9 and the seventh diode D7; The thirty-eighth resistor R38 and the thirty-ninth resistor R39 are grounded, and are also connected to the gate of the third MOS tube and the anode of the seventh diode D7 respectively through the thirty-fourth resistor R34; its fourth pin is grounded; its fifth pin is connected to the cathode of the seventh diode D7; its sixth pin is connected to the positive electrode of the charging capacitor through the twenty-seventh resistor R27; its seventh pin is grounded through the seventh capacitor C7; its eighth pin is connected to the external signal through the twenty-ninth resistor R29; the twenty-eighth resistor R28 is connected between the sixth pin and the eighth pin of the first chip U1; the thirty-fifth resistor R35 is connected in parallel with the fourth diode; the thirty-third resistor R33 is connected between the input end of the auxiliary power module 5 and the second pin of the first chip U1; the ninth capacitor C9 is connected between the sixth pin of the first chip U1 and the ground.

[0066] like Figure 6As shown, the external driving module 7 also includes a forty-sixth resistor R46 and a first optocoupler PH1A and a second optocoupler PH1B that cooperate with each other; the external control signal input end is connected to the power input end of the external driving module 7 through the first optocoupler PH1A and the forty-sixth resistor R46; one end of the second optocoupler PH1B is grounded, and the other end is connected to the source of the second MOS tube as the control signal output end of the external driving module 7; when the external control signal is at a low level, the first optocoupler PH1A is turned on and linked to the second optocoupler PH1B; when the second optocoupler PH1B is turned on, the voltage of the gate of the second MOS tube is pulled down to turn off the second MOS tube.

[0067] like Figure 6 As shown, the dimming module 8 also includes a forty-ninth resistor R49, an eleventh diode D11, a fiftieth resistor R50, a fifty-first resistor R51, a third transistor Q8, a third optical coupler PH2A and a fourth optical coupler PH2B; the pulse signal input end is connected to the anode of the eleventh diode D11 through the forty-ninth resistor R49; the cathode of the eleventh diode D11 is connected to the base of the third transistor Q8; the base of the third transistor Q8 is connected to its emitter through the fiftieth resistor R50; the third optical coupler PH2A and the fourth optical coupler PH2B are linked and coordinated, and are bridged between the collector and emitter of the third transistor Q8; the collector of the third transistor Q8 is connected to the power input end of the dimming module 8 through the fifty-first resistor R51; the pulse signal output end of the dimming module 8 is used to output an external signal; one end of the fourth optical coupler PH2B is grounded, and the other end is connected to the eighth pin of the first chip through the twenty-ninth resistor as the pulse signal output end of the dimming module 8.

[0068] In summary, the low-power consumption constant-current starting LED driving power supply provided by the present invention avoids the problem that the constant-current starting module 2 continues to work after the flyback power supply module 3 is started, causing circuit loss and affecting the standby power consumption of the LED driving power supply, and also improves the reliability and starting speed of the circuit.

[0069] The description of the above specification and embodiments is used to explain the protection scope of the present invention, but does not constitute a limitation on the protection scope of the present invention. Through the enlightenment of the present invention or the above embodiments, ordinary technicians in this field can obtain modifications, equivalent substitutions or other improvements to the embodiments of the present invention or part of the technical features thereof through logical analysis, reasoning or limited experiments, which should be included in the protection scope of the present invention.

Claims

1. A low-power constant-current start-up LED driver power supply, comprising a DC power supply module for converting AC input into a DC bus voltage output, characterized in that: Also includes A flyback power supply module, comprising a power input terminal, a driving terminal and a power output terminal; the power input terminal and the power output terminal thereof are respectively connected to the DC bus voltage and the power input terminal of the LED; The control module includes a power supply terminal, a signal receiving terminal and a signal output terminal; the power supply terminal is used to receive a start-up voltage; the signal receiving terminal is used to receive an external signal; Its signal output end is connected to the driving end of the flyback power supply module and outputs a control signal for controlling the start and stop of the flyback power supply module according to the external signal; A constant current starting module, comprising a power input terminal, a power output terminal and a first control terminal; the power input terminal is connected to the DC bus voltage; the power output terminal is connected to the power terminal of the control module; An auxiliary power supply module, whose input end is connected to the flyback power supply module, and whose output end outputs an auxiliary voltage when the flyback power supply module is started; and A switch switching module, whose input end is connected to the output end of the auxiliary power supply module, and whose output end is connected to the first control end of the constant current startup module, and is used to pull down the voltage of the first control end of the constant current startup module to shut down the constant current startup module when the flyback power supply module is started; the constant current startup module includes a voltage divider circuit and a constant current circuit; the input end of the voltage divider circuit serves as the power input end of the constant current startup module, and the output end is connected to the input end of the constant current circuit; the constant current circuit includes a first MOS tube, a first voltage regulator diode, a third resistor, a first diode, a charging capacitor, a fourth resistor, a fifth resistor, a first capacitor, a second voltage regulator diode and a second diode; The drain of the first MOS tube is connected to the cathode of the first voltage stabilizing diode as the input end of the constant current circuit; the anode of the first voltage stabilizing diode is connected to the cathode of the first diode through the third resistor; the anode of the first diode is connected to the positive electrode of the charging capacitor and serves as the power output end of the constant current starting module; the negative electrode of the charging capacitor is grounded; the source of the first MOS tube is connected to the cathode of the first diode, and is also connected to the positive electrode of the charging capacitor and the gate of the first MOS tube through the fourth resistor and the fifth resistor respectively; the gate of the first MOS tube is connected to the cathode of the second voltage stabilizing diode as the first control end of the constant current starting module; the anode of the second voltage stabilizing diode is connected to the positive electrode of the charging capacitor through the first capacitor; the second diode is connected in parallel with the first capacitor; wherein the constant current starting module is turned off when the flyback power supply module is started; when the DC bus voltage is input, the first MOS tube is turned on, and the current charges the charging capacitor through the fourth resistor, and the control module is started when the charging capacitor is fully charged.

2. A low-power consumption constant current start-up LED driving power supply as claimed in claim 1, characterized in that: The switch switching module includes a first resistor, a second resistor and a first transistor; One end of the first resistor serves as the input end of the switch switching module, and the other end thereof is connected to one end of the second resistor; the other end of the second resistor is grounded and connected to the emitter of the first transistor; the base of the first transistor is connected between the first resistor and the second resistor, and the collector thereof serves as the output end of the switch switching module; when the flyback power supply module is started, the first transistor is turned on.

3. A low-power consumption constant current start-up LED driving power supply as claimed in claim 1, characterized in that: The voltage divider circuit includes a sixth resistor, a seventh resistor, a second MOS transistor, an eighth resistor, a ninth resistor and a tenth resistor; One end of the sixth resistor is connected to the DC bus voltage as the input end of the voltage divider circuit, and the other end is connected to the drain of the second MOS transistor through the seventh resistor; the gate of the second MOS transistor is connected to the anode of the first voltage zener diode; the eighth resistor is connected between the gate and source of the second MOS transistor; the source of the second MOS transistor is connected to the cathode of the first voltage zener diode; The tenth resistor is connected between the drain and the source of the second MOS tube.

4. A low-power consumption constant current start-up LED driving power supply as claimed in claim 1, characterized in that: The control module also includes an electrical signal sampling terminal; the flyback power supply module includes a first absorption circuit, a third MOS tube, a third capacitor, a transformer, a rectifier circuit, a second absorption circuit, a filter circuit, a first common mode inductor and a current ripple elimination circuit; The transformer comprises a first primary winding, a second primary winding and a secondary winding; the non-same-name end of the first primary winding is connected to the DC bus voltage, and the same-name end thereof is connected to the drain of the third MOS tube; the source of the third MOS tube is connected to the electrical signal sampling end of the control module, and the gate thereof serves as the driving end of the flyback power supply module; the third capacitor is connected across the drain and source of the third MOS tube; the input end of the first absorption circuit is connected to the non-same-name end of the first primary winding, and the output end thereof is connected to the same-name end of the first primary winding; the second primary winding is connected to the same-name end of the first primary winding; The same-name end of the winding is connected to the input end of the auxiliary power supply module, and its non-same-name end is grounded; the same-name end of the secondary winding is connected to the input end of the rectifier circuit and the second absorption circuit, and its non-same-name end is grounded; the output end of the second absorption circuit is connected to the output end of the rectifier circuit; the first common-mode inductor is composed of a first coil and a second coil; the non-same-name end of the first coil is connected to the output end of the rectifier circuit, and its same-name end is connected to the input end of the current ripple elimination circuit; the non-same-name end of the second coil is connected to the non-same-name end of the secondary winding, and its same-name end is grounded; The filter circuit is connected across the same-name end and the non-same-name end of the secondary winding; the output end of the current ripple elimination circuit serves as the power output end of the flyback power supply module.

5. A low-power consumption constant current start-up LED driving power supply as claimed in claim 1, characterized in that: The control module includes a first chip, a twenty-seventh resistor, a twenty-eighth resistor, a twenty-ninth resistor, a thirtieth resistor, a thirty-first resistor, a thirty-second resistor, a thirty-third resistor, a thirty-fourth resistor, a thirty-fifth resistor, a thirty-sixth resistor, a thirty-seventh resistor, a thirty-eighth resistor, a thirty-ninth resistor, a seventh capacitor, an eighth capacitor, a ninth capacitor and a seventh diode; The first pin of the first chip is grounded through the eighth capacitor and the thirtieth resistor; The second pin thereof is grounded through the thirty-first resistor and the thirty-second resistor respectively; The third pin thereof is grounded through the thirty-sixth resistor, the thirty-seventh resistor, the thirty-eighth resistor and the thirty-ninth resistor respectively, and is also connected to the gate of the third MOS tube and the anode of the seventh diode respectively through the thirty-fourth resistor; the fourth pin thereof is grounded; Its fifth pin is connected to the cathode of the seventh diode; its sixth pin is connected to the positive electrode of the charging capacitor through the twenty-seventh resistor; its seventh pin is grounded through the seventh capacitor; The eighth pin thereof is connected to the external signal via the twenty-ninth resistor; The twenty-eighth resistor is connected between the sixth pin and the eighth pin of the first chip; the thirty-fifth resistor is connected in parallel with the fourth diode; the thirty-third resistor is connected between the input end of the auxiliary power supply module and the second pin of the first chip; and the ninth capacitor is connected between the sixth pin of the first chip and ground.

6. A low-power consumption constant current start-up LED driving power supply as claimed in claim 4, characterized in that: The auxiliary power supply module includes an eighth diode, a tenth capacitor, an eleventh capacitor, a fortieth resistor, a third voltage-stabilizing diode, a second triode and a ninth diode; The anode of the eighth diode is connected to the same-name end of the second primary winding as the input end of the auxiliary power supply module, and its cathode is connected to the collector of the second transistor; one end of the eleventh capacitor is connected to the cathode of the eighth diode, and the other end is connected to the non-same-name end of the second primary winding; the tenth capacitor is connected in parallel with the eleventh capacitor; the fortieth resistor is connected between the collector and the base of the second transistor; the cathode of the third voltage-stabilizing diode is connected to the base of the second transistor, and its anode is connected to the non-same-name end of the second primary winding; the emitter of the second transistor is connected to the anode of the ninth diode as the output end of the auxiliary power supply module; the cathode of the ninth diode is connected to the power output end of the constant current starting module.

7. A low-power consumption constant current start-up LED driving power supply as claimed in claim 1, characterized in that: The DC power supply module includes a first fuse, a second fuse, a twelfth capacitor, a forty-first resistor, a forty-second resistor, a forty-third resistor, a forty-fourth resistor, a second common-mode inductor, a first varistor, a thirteenth capacitor, a rectifier bridge stack, a second varistor, a fourteenth capacitor, a fifteenth capacitor, a forty-fifth resistor and a first inductor; The second common-mode inductor is composed of a third coil and a fourth coil; the same-name end of the third coil is connected to the live wire of the AC input through a first fuse; the second fuse is connected in parallel with the first fuse; the same-name end of the fourth coil is connected to the neutral wire of the AC input; the twelfth capacitor is connected across the same-name ends of the third coil and the fourth coil, and is respectively connected in parallel with the forty-first resistor and the forty-fourth resistor connected in series with each other and the forty-third resistor and the forty-fourth resistor connected in series with each other; the first varistor is connected to the non-same-name ends of the third coil and the fourth coil; the rectifier bridge stack includes a first input end, a second input end, a first output end and a second output end; the thirteenth capacitor is connected between the first input end and the second input end of the rectifier bridge stack; the non-same-name end of the third coil and the non-same-name end of the fourth coil are respectively connected to the first input end and the second output end of the rectifier bridge stack; the first varistor is connected in parallel with the thirteenth capacitor; The second varistor is connected between the first output end and the second output end of the rectifier bridge stack; the second output end of the rectifier bridge stack is grounded, and its first output end is connected to one end of the first inductor; the other end of the first inductor serves as the output end of the DC power supply module; the forty-fifth resistor is connected in parallel with the first inductor, and its two ends are grounded respectively through the fourteenth capacitor and the fifteenth capacitor.

8. A low-power consumption constant current start-up LED driving power supply as claimed in claim 3, characterized in that: It also includes an external driving module; the external driving module includes an external control signal input terminal, a power input terminal, a control signal output terminal, a forty-sixth resistor, and a first optocoupler and a second optocoupler that cooperate with each other; the constant current starting module also includes a control signal input terminal; the gate of the second MOS tube serves as the control signal input terminal of the constant current starting module; The external control signal input terminal is used to connect an external control signal, and is connected to the power input terminal of the external driving module through the first optical coupler and the forty-sixth resistor; One end of the second optical coupler is grounded, and the other end is connected to the source of the second MOS tube as a control signal output end of the external driving module; When the external control signal is at a low level, the first optocoupler is turned on and links the second optocoupler; when the second optocoupler is turned on, the voltage of the gate of the second MOS tube is pulled down to turn off the second MOS tube.

9. A low-power consumption constant current start-up LED driving power supply as claimed in claim 5, characterized in that: It also includes a dimming module; the dimming module includes a pulse signal input terminal, a power input terminal, a pulse signal output terminal, a forty-ninth resistor, an eleventh diode, a fiftieth resistor, a fifty-first resistor, a third transistor, a third optical coupler and a fourth optical coupler; The pulse signal input terminal is used to connect an external PWM signal, and is connected to the anode of the eleventh diode through the forty-ninth resistor; the cathode of the eleventh diode is connected to the base of the third transistor; the base of the third transistor is connected to its emitter through the fiftieth resistor; the third optocoupler cooperates with the fourth optocoupler and is bridged between the collector and emitter of the third transistor; the collector of the third transistor is connected to the power input terminal of the dimming module through the fifty-first resistor; the pulse signal output terminal of the dimming module is used to output the external signal; one end of the fourth optocoupler is grounded, and the other end is connected to the eighth pin of the first chip through the twenty-ninth resistor as the pulse signal output terminal of the dimming module.

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