LED constant-power driving circuit and driving power supply

Abstract

The utility model discloses an LED constant power driving circuit and a driving power supply, the LED constant power driving circuit comprises a power supply circuit, a control circuit and a photoelectric module driving circuit, the power supply circuit comprises a first power supply circuit and a second power supply circuit, the photoelectric module driving circuit comprises a plurality of photoelectric module driving circuit units, each photoelectric module driving circuit unit is connected with a photoelectric module, the photoelectric modules are the same in power and different in color temperature, the control circuit is connected with a PWM port of each photoelectric module driving circuit unit through a PWM output end of the control circuit, and the photoelectric modules connected with the control circuit are lightened at constant power through the photoelectric module driving circuit units. Through the cooperation of the power supply circuit, the control circuit and the photoelectric module driving circuit, the power of the driving circuit is greatly reduced, the power of the driving circuit is saved, and the cost of the driving circuit is reduced under the condition that the single-color and mixed-color constant-power lightening of the photoelectric module connected with the photoelectric module driving circuit is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of LED drive circuits, and more specifically, to an LED constant power drive circuit and a drive power supply. Background Art

[0002] LED lights are usually composed of a light source, a heat sink, and a driver. At present, the common driver power supplies on the market are all constant current outputs, so when the driver power supply matches multiple optoelectronic modules with the same power and different color temperatures for constant power output, the power of the driver power supply must be the sum of the powers of all the optoelectronic modules to ensure the constant power output of the single-color and mixed-color optoelectronic modules. This will cause the driver power to have excess power, which undoubtedly increases the cost of the driver power supply.

[0003] Therefore, it is necessary to propose a new solution to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies of the above-mentioned prior art and provide an LED constant power drive circuit and a drive power supply. By coordinating a power supply circuit, a control circuit and a photoelectric module drive circuit, the power of the drive circuit is greatly reduced while ensuring that the single-color and mixed-color constant power of the photoelectric module connected to the photoelectric module drive circuit is lit, thereby saving the power of the drive circuit and reducing the cost of the drive circuit. At the same time, the control circuit is externally connected to a DMX512 controller to achieve constant power dimming.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A LED constant power drive circuit comprises a power supply circuit, a control circuit and a photoelectric module drive circuit, wherein the power supply circuit comprises a first power supply circuit and a second power supply circuit, wherein the output end of the first power supply circuit is connected to the power supply end of the photoelectric module drive circuit, the input end of the second power supply circuit is connected to the output end of the first power supply circuit, and the output end of the second power supply circuit is connected to the power supply end of the control circuit; the photoelectric module drive circuit comprises a plurality of photoelectric module drive circuit units, each of which is connected to a photoelectric module, the photoelectric modules have the same power but different color temperatures, the control circuit is connected to a PWM port of each photoelectric module drive circuit unit via its PWM output end, and the photoelectric module connected thereto is lit at constant power via the photoelectric module drive circuit unit.

[0007] Furthermore, the control circuit includes a chip U3, the first pin, the third pin, the fifth pin and the nineteenth pin of the chip U3 are PWM output ends, the eighth pin of the chip U3 is connected to one end of the capacitor C9, and its common connection end is connected to the output end of the second power supply circuit, and the tenth pin of the chip U3 is connected to the other end of the capacitor C9, and its common connection end is grounded.

[0008] Furthermore, the chip U3 is connected to a lightning protection circuit, which includes a TVS diode D1 and a TVS diode D2. The cathode of the TVS diode D1 is connected to the seventeenth pin of the chip U3, the anode of the TVS diode D1 is grounded, the cathode of the TVS diode D2 is connected to the eighteenth pin of the chip U3, and the anode of the TVS diode D2 is grounded.

[0009] Furthermore, the control circuit also includes a chip U2, a first pin of the chip U2 is connected to a chip U3 through a resistor R42, a second pin, a third pin and a fifth pin of the chip U2 are grounded, and an eighth pin of the chip U2 is connected to an output end of a second power supply circuit; a sixth pin and a seventh pin of the chip U2 are connected to a DMX512 signal through resistors R1 and R2 respectively, and a seventeenth pin and an eighteenth pin of the chip U3 are connected to an address code through resistors R4 and R3 respectively.

[0010] Furthermore, the first power supply circuit includes a chip U1, a first pin of the chip U1 is connected to one end of the capacitor C4, a second pin of the chip U1 is grounded, a third pin of the chip U1 is respectively connected to one end of the resistor R7 and one end of the resistor R8, the resistor R8 is grounded, a fifth pin of the chip U1 is connected to one end of the resistor R41, the other end of the resistor R41 is connected to the fourth pin of the chip U1, and the common connection end thereof is the input end of the first power supply circuit, a sixth pin of the chip U3 is respectively connected to the other end of the capacitor C4, the negative electrode of the diode D17 and one end of the inductor L5, the other end of the inductor L5 is respectively connected to the other end of the resistor R7 and one end of the capacitor C3, and the common connection end thereof is the output end of the first power supply circuit, the other end of the capacitor C3 is connected to the positive electrode of the diode D17, and the common connection end thereof is grounded.

[0011] Further, the input end of the first power supply circuit is connected to a DC constant voltage power supply through an input reverse connection protection circuit, the input reverse connection protection circuit includes a MOS tube Q1 and a MOS tube Q2, the source of the MOS tube Q1 is connected to the source of the MOS tube Q2, and the common connection end thereof is connected to the DC constant voltage power supply, the base of the MOS tube Q1 is respectively connected to the resistor R5, the base of the MOS tube Q2 and one end of the resistor R6, the other end of the resistor R5 is grounded, the drain of the MOS tube Q1 is respectively connected to the drain of the MOS tube Q2 and the other end of the resistor R6, and the common connection end thereof is connected to the input end of the first power supply circuit.

[0012] Furthermore, the second power supply circuit includes a chip U8, a first pin of the chip U8 is an input end of the second power supply circuit, a second pin of the chip U8 is grounded, a third pin of the chip U8 is connected to one end of a capacitor C2, and the common connection end thereof is an output end of the second power supply circuit, and the other end of the capacitor C2 is grounded.

[0013] Furthermore, the optoelectronic module driving circuit includes a first optoelectronic module driving circuit unit, a second optoelectronic module driving circuit unit, a third optoelectronic module driving circuit unit and a fourth optoelectronic module driving circuit unit, and the first optoelectronic module driving circuit unit, the second optoelectronic module driving circuit unit, the third optoelectronic module driving circuit unit and the fourth optoelectronic module driving circuit unit are constant current driver circuits.

[0014] Furthermore, the chip U7 of the first optoelectronic module driving circuit unit, the chip U6 of the second optoelectronic module driving circuit unit, the chip U5 of the third optoelectronic module driving circuit unit, and the chip U4 of the fourth optoelectronic module driving circuit unit use the HI7020S chip model.

[0015] The utility model also discloses an LED constant power driving power supply, comprising the above-mentioned LED constant power driving circuit.

[0016] The beneficial effects of the utility model are:

[0017] 1. In the utility model, the power supply circuit, the control circuit and the photoelectric module driving circuit are coordinated to ensure that the single-color and mixed-color constant-power lighting of the photoelectric module connected to the photoelectric module driving circuit is ensured, and the power of the driving circuit is greatly reduced, thereby saving the power of the driving circuit and reducing the cost of the driving circuit; at the same time, the control circuit is connected to an external DMX512 controller to achieve constant-power dimming.

[0018] 2. In the utility model, an input reverse connection protection circuit is provided to prevent the first power supply circuit from failing due to reverse polarity of the first power supply circuit when the first power supply circuit is connected to a DC constant voltage power supply.

[0019] 3. In the present invention, by providing a lightning protection circuit, the control circuit has a lightning protection effect to prevent the control circuit from being impacted by transient high-voltage spike pulses.

[0020] 4. In the utility model, by setting up a photoelectric module driving circuit, the driving circuit has the effect of output open circuit and short circuit protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a structural schematic diagram of a driving circuit in this embodiment;

[0022] Figure 2 is a circuit diagram of the first power supply circuit in this embodiment;

[0023] Figure 3 is a circuit diagram of the second power supply circuit in this embodiment;

[0024] Figure 4 A circuit diagram of the anti-reverse connection circuit in this embodiment;

[0025] Figure 5 is a circuit diagram of the control circuit in this embodiment;

[0026] Figure 6 is a circuit diagram of the first optoelectronic module driving circuit unit in this embodiment;

[0027] Figure 7 is a circuit diagram of the second optoelectronic module driving circuit unit in this embodiment;

[0028] Figure 8 is a circuit diagram of the third optoelectronic module driving circuit unit in this embodiment;

[0029] Fig. 9 Schematic diagram of a circuit of the fourth optoelectronic module driving circuit unit in this embodiment.

[0030] Figure numerals: power supply circuit 1, first power supply circuit 101, second power supply circuit 102, control circuit 2, optoelectronic module driving circuit 3, first optoelectronic module driving circuit unit 301, second optoelectronic module driving circuit unit 302, third optoelectronic module driving circuit unit 303, fourth optoelectronic module driving circuit unit 304. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] Embodiment 1: A LED constant power driving circuit, such as Figure 1-Figure 9As shown, it includes a power supply circuit 1, a control circuit 2 and a photoelectric module driving circuit 3, the power supply circuit 1 includes a first power supply circuit 101 and a second power supply circuit 102, the output end of the first power supply circuit 101 is connected to the power supply end of the photoelectric module driving circuit 3, the input end of the second power supply circuit 102 is connected to the output end of the first power supply circuit 101, and the output end of the second power supply circuit 102 is connected to the power supply end of the control circuit 2; the photoelectric module driving circuit 3 includes a plurality of photoelectric module driving circuit units, each of which is connected to a photoelectric module, and the photoelectric modules have the same power and different color temperatures, the control circuit 2 is connected to the PWM port of each photoelectric module driving circuit unit through its PWM output end, and the photoelectric module connected thereto is lit at constant power through the photoelectric module driving circuit unit.

[0033] Among them, the input end of the first power supply circuit 101 is connected to a DC constant voltage power supply, and the voltage of the DC constant voltage power supply is converted through it to supply power to the photoelectric module driving circuit 3; the input end of the second power supply circuit 102 is connected to the output end of the first power supply circuit 101, and the output voltage of the first power supply circuit 101 is converted through it to supply power to the control circuit 2; the control circuit 2 is connected to multiple photoelectric module driving circuit units through its PWM output end, and the photoelectric module connected thereto is lit at constant power through the photoelectric module driving circuit unit, so as to realize single-color constant power lighting and mixed-color constant power lighting of the photoelectric module.

[0034] Further, such as Figure 2 As shown, the first power supply circuit 101 includes a chip U1, and the chip U1 adopts the HI9204 chip model. The first pin of the chip U1 is connected to one end of the capacitor C4, the second pin of the chip U1 is grounded, the third pin of the chip U1 is respectively connected to one end of the resistor R7 and one end of the resistor R8, the resistor R8 is grounded, the fifth pin of the chip U1 is connected to one end of the resistor R41, the other end of the resistor R41 is connected to the fourth pin of the chip U1, and the common connection end thereof is the input end of the first power supply circuit 101, the sixth pin of the chip U3 is respectively connected to the other end of the capacitor C4, the cathode of the diode D17 and one end of the inductor L5, the other end of the inductor L5 is respectively connected to the other end of the resistor R7 and one end of the capacitor C3, and the common connection end thereof is the output end of the first power supply circuit 101, the other end of the capacitor C3 is connected to the anode of the diode D17, and the common connection end thereof is grounded.

[0035] like Figure 3 As shown, the second power supply circuit 102 includes a chip U8, and the chip U8 adopts the 78L05 chip model. The first pin of the chip U8 is the input end of the second power supply circuit 102, the second pin of the chip U8 is grounded, and the third pin of the chip U8 is connected to one end of the capacitor C2, and the common connection end thereof is the output end of the second power supply circuit 102, and the other end of the capacitor C2 is grounded.

[0036] In this embodiment, the input end of the first power supply circuit 101 is connected to a DC constant voltage power supply, the voltage of the DC constant voltage power supply is DC24 V-48V, the output voltage of the output end of the first power supply circuit 101 is 15V, the input voltage of the input end of the second power supply circuit 102 is 15V, and the output voltage of the output end of the second power supply circuit 102 is 5V.

[0037] As a preference, Figure 4 As shown, the input end of the first power supply circuit 101 is connected to the DC constant voltage power supply through the input reverse connection protection circuit, the input reverse connection protection circuit includes a MOS transistor Q1 and a MOS transistor Q2, the source of the MOS transistor Q1 is connected to the source of the MOS transistor Q2, and the common connection end thereof is connected to the DC constant voltage power supply, the base of the MOS transistor Q1 is respectively connected to the resistor R5, the base of the MOS transistor Q2 and one end of the resistor R6, the other end of the resistor R5 is grounded, the drain of the MOS transistor Q1 is respectively connected to the drain of the MOS transistor Q2 and the other end of the resistor R6, and the common connection end thereof is connected to the input end of the first power supply circuit 101. By setting the input reverse connection protection circuit, the first power supply circuit 101 is prevented from failing due to the reverse polarity of the first power supply circuit 101 when the first power supply circuit 101 is connected to the DC constant voltage power supply.

[0038] Preferably, the input end of the first power supply circuit 101 is further connected to a filter circuit, the filter circuit includes a capacitor C1 , a capacitor E1 and a capacitor E2 , and the capacitors C1 , E1 and E2 are connected in parallel to the input end of the first power supply circuit 101 .

[0039] Further, such as Figure 5 As shown, the control circuit 2 includes a chip U3, and the chip U3 adopts a DMX01 single-chip microcomputer. The first pin, the third pin, the fifth pin and the nineteenth pin of the chip U3 are PWM output terminals, the eighth pin of the chip U3 is connected to one end of the capacitor C9, and its common connection terminal is connected to the output terminal of the second power supply circuit 102, and the tenth pin of the chip U3 is connected to the other end of the capacitor C9, and its common connection terminal is grounded. When in use, the chip U3 is respectively connected to the first photoelectric module driving circuit unit 301, the second photoelectric module driving circuit unit 302, the third photoelectric module driving circuit unit 303 and the fourth photoelectric module driving circuit unit 304 through the PWM output terminal, and the first photoelectric module driving circuit unit 301, the second photoelectric module driving circuit unit 302, the third photoelectric module driving circuit unit 303 and the fourth photoelectric module driving circuit unit 304 are controlled by outputting high and low levels to output a constant current to the corresponding photoelectric module.

[0040] Preferably, the chip U3 is connected to a lightning protection circuit, which includes a TVS diode D1 and a TVS diode D2, wherein the cathode of the TVS diode D1 is connected to the seventeenth pin of the chip U3, the anode of the TVS diode D1 is grounded, the cathode of the TVS diode D2 is connected to the eighteenth pin of the chip U3, and the anode of the TVS diode D2 is grounded. By setting up the lightning protection circuit, the control circuit 2 has a lightning protection effect to prevent the control circuit 2 from being impacted by transient high-voltage spike pulses.

[0041] Preferably, the control circuit 2 also includes a chip U2, which adopts the SM485H chip model. The first pin of the chip U2 is connected to the chip U3 through a resistor R42, the second pin, the third pin and the fifth pin of the chip U2 are grounded, and the eighth pin of the chip U2 is connected to the output end of the second power supply circuit 102; the sixth pin and the seventh pin of the chip U2 are connected to the DMX512 signal through resistors R1 and R2 respectively, and the seventeenth pin and the eighteenth pin of the chip U3 are connected to the address code through resistors R4 and R3 respectively, that is, the sixth pin of the chip U2 is connected to the main line DA through resistor R1, and the seventh pin of the chip U2 is connected to the main line DB through resistor R2, and the main lines DA and DB are used to access the input signal of the DMX512 controller, the seventeenth pin of the chip U3 is connected to the main line AO ​​through resistor R4, and the eighteenth pin of the chip U3 is connected to the main line AI through resistor R3, and the main lines AO and AI are used to access the address code of the DMX512 controller. When in use, the DMX512 controller adopts the international standard DMX512 (1990) protocol to transmit the DMX512 signal to the chip U2 through the main line DA, the main line DB and the ground. After writing the address, the address is encoded to the chip U3 through the main line AO ​​and the main line AI. After analysis, the chip U2 and the chip U3 control the corresponding photoelectric module drive circuit unit to output a constant current to the corresponding photoelectric module, output the required constant power, and realize dimming.

[0042] The optoelectronic module driving circuit 3 includes a first optoelectronic module driving circuit unit 301, a second optoelectronic module driving circuit unit 302, a third optoelectronic module driving circuit unit 303 and a fourth optoelectronic module driving circuit unit 304. The first optoelectronic module driving circuit unit 301, the second optoelectronic module driving circuit unit 302, the third optoelectronic module driving circuit unit 303 and the fourth optoelectronic module driving circuit unit 304 are constant current driver circuits. Specifically:

[0043] like Figure 6As shown, the first optoelectronic module driving circuit unit 301 includes a chip U7, and the chip U7 adopts the HI7020S chip model. The first pin of the chip U7 is connected to the output end of the first power supply circuit 101, and the second pin of the chip U7 is respectively connected to one end of the resistor R40, one end of the resistor R20, one end of the resistor R24, one end of the resistor R28, one end of the resistor R32 and the source of the MOS tube Q6. The third pin of the chip U7 is respectively connected to the other end of the resistor R40, the other end of the resistor R20, the other end of the resistor R24, the other end of the resistor R28 and the other end of the resistor R32, and the common connection end thereof is grounded. The fourth pin of the chip U7 is connected to the source of the MOS tube Q6 through the power supply circuit 101. Resistor R39 is connected to the base of MOS tube Q6, the drain of MOS tube Q6 is respectively connected to the anode of diode D16, the anode of diode D12, the anode of diode D8 and one end of inductor L4, the cathode of diode D16 is respectively connected to the cathode of diode D12 and the cathode of diode D8, and their common connection end is connected to the input end of the first power supply circuit 101, the other end of inductor L4 is connected to the optoelectronic module, the fifth pin of chip U7 is respectively connected to one end of resistor R8 and one end of resistor R12, the other end of resistor R8 is grounded, the other end of resistor R12 is connected to one end of capacitor C8, and their common connection end is a PWM port for connecting to the PWM output end of chip U3.

[0044] like Figure 7 As shown, the second optoelectronic module driving circuit unit 302 includes a chip U6, and the chip U6 adopts the HI7020S chip model. The first pin of the chip U6 is connected to the output end of the first power supply circuit 101, and the second pin of the chip U7 is respectively connected to one end of the resistor R38, one end of the resistor R19, one end of the resistor R23, one end of the resistor R27, one end of the resistor R31 and the source of the MOS tube Q5. The third pin of the chip U6 is respectively connected to the other end of the resistor R38, the other end of the resistor R19, the other end of the resistor R23, the other end of the resistor R27 and the other end of the resistor R31, and the common connection end thereof is grounded. The fourth pin of the chip U6 is connected to the source of the MOS tube Q5 through the resistor R38. R37 is connected to the base of the MOS tube Q5, the drain of the MOS tube Q5 is respectively connected to the anode of the diode D15, the anode of the diode D11, the anode of the diode D7 and one end of the inductor L3, the cathode of the diode D15 is respectively connected to the cathode of the diode D11 and the cathode of the diode D7, and their common connection end is connected to the input end of the first power supply circuit 101, the other end of the inductor L3 is connected to the optoelectronic module, the fifth pin of the chip U6 is respectively connected to one end of the resistor R15 and one end of the resistor R11, the other end of the resistor R15 is grounded, the other end of the resistor R11 is connected to one end of the capacitor C7, and their common connection end is a PWM port for connecting the PWM output end of the chip U3.

[0045] like Figure 8As shown, the third optoelectronic module driving circuit unit 303 includes a chip U5, and the chip U5 adopts the HI7020S chip model. The first pin of the chip U5 is connected to the output end of the first power supply circuit 101, and the second pin of the chip U5 is respectively connected to one end of the resistor R36, one end of the resistor R18, one end of the resistor R22, one end of the resistor R26, one end of the resistor R30 and the source of the MOS tube Q4. The third pin of the chip U5 is respectively connected to the other end of the resistor R36, the other end of the resistor R18, the other end of the resistor R22, the other end of the resistor R26 and the other end of the resistor R30, and the common connection end thereof is grounded. The fourth pin of the chip U5 is connected to the source of the MOS tube Q4 through the resistor R36. R35 is connected to the base of the MOS tube Q4, the drain of the MOS tube Q4 is respectively connected to the anode of the diode D14, the anode of the diode D10, the anode of the diode D6 and one end of the inductor L2, the cathode of the diode D14 is respectively connected to the cathode of the diode D10 and the cathode of the diode D6, and their common connection end is connected to the input end of the first power supply circuit 101, the other end of the inductor L2 is connected to the optoelectronic module, the fifth pin of the chip U5 is respectively connected to one end of the resistor R14 and one end of the resistor R10, the other end of the resistor R14 is grounded, the other end of the resistor R10 is connected to one end of the capacitor C6, and their common connection end is a PWM port for connecting the PWM output end of the chip U3.

[0046] like Fig. 9 As shown, the fourth optoelectronic module driving circuit unit 304 includes a chip U4, and the chip U4 adopts the HI7020S chip model. The first pin of the chip U4 is connected to the output end of the first power supply circuit 101, and the second pin of the chip U4 is respectively connected to one end of the resistor R34, one end of the resistor R17, one end of the resistor R21, one end of the resistor R25, one end of the resistor R29 and the source of the MOS tube Q3. The third pin of the chip U4 is respectively connected to the other end of the resistor R34, the other end of the resistor R17, the other end of the resistor R21, the other end of the resistor R25 and the other end of the resistor R29, and the common connection end thereof is grounded. The fourth pin of the chip U4 is connected to the source of the MOS tube Q3. The resistor R33 is connected to the base of the MOS tube Q3, the drain of the MOS tube Q3 is respectively connected to the anode of the diode D13, the anode of the diode D9, the anode of the diode D5 and one end of the inductor L1, the cathode of the diode D13 is respectively connected to the cathode of the diode D9 and the cathode of the diode D5, and their common connection end is connected to the input end of the first power supply circuit 101, the other end of the inductor L1 is connected to the optoelectronic module, the fifth pin of the chip U4 is respectively connected to one end of the resistor R13 and one end of the resistor R9, the other end of the resistor R13 is grounded, the other end of the resistor R9 is connected to one end of the capacitor C5, and their common connection end is a PWM port for connecting the PWM output end of the chip U3.

[0047] The first photoelectric module driving circuit unit 301, the second photoelectric module driving circuit unit 302, the third photoelectric module driving circuit unit 303 and the fourth photoelectric module driving circuit unit 304 all use the HI7020S chip. The PWM port (fifth pin) of the HI7020S chip supports PWM dimming with an ultra-small duty cycle and can respond to a minimum pulse width of 60ns. When the PWM port is at a high level, the HI7020S chip works normally, and when the PWM port is at a low level, the HI7020S chip output is turned off. At the same time, the HI7020S chip achieves precise current control by sampling the current of its CS port (second pin), so that the output current accuracy is within ±3%.

[0048] The photoelectric module is an LED light string, the number of which is 1 to 12 strings, and each LED light string includes a plurality of LED lamp beads. In this embodiment, the photoelectric modules connected to the first photoelectric module driving circuit unit 301, the second photoelectric module driving circuit unit 302, the third photoelectric module driving circuit unit 303 and the fourth photoelectric module driving circuit unit 304 have the same power and different color temperatures, such as the first photoelectric module driving circuit unit 301 is connected to a red photoelectric module, the second photoelectric module driving circuit unit 302 is connected to a green photoelectric module, the third photoelectric module driving circuit unit 303 is connected to a blue photoelectric module, and the fourth photoelectric module driving circuit unit 304 is connected to a white photoelectric module, so that five colors of light can be output, namely red light, green light, blue light, white light, and mixed light of all light phases. At the same time, taking the optoelectronic module power of 100W as an example, when the driving circuit of this embodiment outputs 100W red light, 100W green light, 100W blue light, 100W white light, and 100W mixed light, the power of the driving circuit is only 100W. Compared with the current driving circuit power of 400W, the power and cost of the driving circuit are greatly reduced.

[0049] The optoelectronic module driving circuit 3 adopts the above design, so that the driving circuit has the effect of output open circuit and short circuit protection. For example, when the circuit is open, the HI7020S chip is in standby mode; when the circuit is short-circuited, since the load of the optoelectronic module is 0V, the output current of the HI7020S chip is still the set current, but the load voltage is 0, so that the output power is also approximately equal to 0, and the short circuit does not damage other components until the short circuit state is eliminated by human intervention.

[0050] Embodiment 2: This embodiment provides an LED constant power driving power supply, and the LED constant power driving power supply includes the LED constant power driving circuit provided in Embodiment 1.

[0051] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A LED constant power driving circuit, comprising a power supply circuit (1), a control circuit (2) and a photoelectric module driving circuit (3), characterized in that: The power supply circuit (1) comprises a first power supply circuit (101) and a second power supply circuit (102); the output end of the first power supply circuit (101) is connected to the power supply end of the photoelectric module driving circuit (3); the input end of the second power supply circuit (102) is connected to the output end of the first power supply circuit (101); the output end of the second power supply circuit (102) is connected to the power supply end of the control circuit (2); the photoelectric module driving circuit (3) comprises a plurality of photoelectric module driving circuit units, each of which is connected to a photoelectric module, the photoelectric modules have the same power but different color temperatures, the control circuit (2) is connected to the PWM port of each photoelectric module driving circuit unit via its PWM output end, and the photoelectric module connected thereto is lit at a constant power via the photoelectric module driving circuit unit.

2. The LED constant power driving circuit according to claim 1, characterized in that: The control circuit (2) comprises a chip U3, wherein the first pin, the third pin, the fifth pin and the nineteenth pin of the chip U3 are PWM output terminals, the eighth pin of the chip U3 is connected to one end of a capacitor C9, and the common connection terminal thereof is connected to the output end of a second power supply circuit (102), and the tenth pin of the chip U3 is connected to the other end of the capacitor C9, and the common connection terminal thereof is grounded.

3. The LED constant power driving circuit according to claim 2, characterized in that: The chip U3 is connected to a lightning protection circuit, which includes a TVS diode D1 and a TVS diode D2. The cathode of the TVS diode D1 is connected to the seventeenth pin of the chip U3, the anode of the TVS diode D1 is grounded, the cathode of the TVS diode D2 is connected to the eighteenth pin of the chip U3, and the anode of the TVS diode D2 is grounded.

4. The LED constant power driving circuit according to claim 2, characterized in that: The control circuit (2) also includes a chip U2, a first pin of the chip U2 is connected to a chip U3 via a resistor R42, a second pin, a third pin and a fifth pin of the chip U2 are grounded, and an eighth pin of the chip U2 is connected to an output end of a second power supply circuit (102); a sixth pin and a seventh pin of the chip U2 are connected to a DMX512 signal via resistors R1 and R2 respectively, and a seventeenth pin and an eighteenth pin of the chip U3 are connected to an address code via resistors R4 and R3 respectively.

5. The LED constant power driving circuit according to claim 1, characterized in that: The first power supply circuit (101) comprises a chip U1, a first pin of the chip U1 is connected to one end of a capacitor C4, a second pin of the chip U1 is grounded, a third pin of the chip U1 is respectively connected to one end of a resistor R7 and one end of a resistor R8, the resistor R8 is grounded, a fifth pin of the chip U1 is connected to one end of a resistor R41, the other end of the resistor R41 is connected to a fourth pin of the chip U1, and their common connection end is the input end of the first power supply circuit (101), a sixth pin of the chip U3 is respectively connected to the other end of the capacitor C4, the cathode of the diode D17 and one end of the inductor L5, the other end of the inductor L5 is respectively connected to the other end of the resistor R7 and one end of the capacitor C3, and their common connection end is the output end of the first power supply circuit (101), and the other end of the capacitor C3 is connected to the anode of the diode D17, and their common connection end is grounded.

6. The LED constant power driving circuit according to claim 1, characterized in that: The input end of the first power supply circuit (101) is connected to a DC constant voltage power supply via an input reverse connection protection circuit, the input reverse connection protection circuit comprises a MOS transistor Q1 and a MOS transistor Q2, the source of the MOS transistor Q1 is connected to the source of the MOS transistor Q2, and the common connection end thereof is connected to the DC constant voltage power supply, the base of the MOS transistor Q1 is respectively connected to a resistor R5, a base of the MOS transistor Q2 and one end of a resistor R6, the other end of the resistor R5 is grounded, the drain of the MOS transistor Q1 is respectively connected to the drain of the MOS transistor Q2 and the other end of the resistor R6, and the common connection end thereof is connected to the input end of the first power supply circuit (101).

7. The LED constant power driving circuit according to claim 1, characterized in that: The second power supply circuit (102) comprises a chip U8, a first pin of the chip U8 being an input end of the second power supply circuit (102), a second pin of the chip U8 being grounded, a third pin of the chip U8 being connected to one end of a capacitor C2, and a common connection end thereof being an output end of the second power supply circuit (102), and the other end of the capacitor C2 being grounded.

8. The LED constant power driving circuit according to claim 1, characterized in that: The photoelectric module driving circuit (3) comprises a first photoelectric module driving circuit unit (301), a second photoelectric module driving circuit unit (302), a third photoelectric module driving circuit unit (303) and a fourth photoelectric module driving circuit unit (304); the first photoelectric module driving circuit unit (301), the second photoelectric module driving circuit unit (302), the third photoelectric module driving circuit unit (303) and the fourth photoelectric module driving circuit unit (304) are constant current driver circuits.

9. The LED constant power driving circuit according to claim 8, characterized in that: The chip U7 of the first optoelectronic module driving circuit unit (301), the chip U6 of the second optoelectronic module driving circuit unit (302), the chip U5 of the third optoelectronic module driving circuit unit (303), and the chip U4 of the fourth optoelectronic module driving circuit unit (304) use the HI7020S chip model.

10. A LED constant power driving power supply, characterized in that: The invention comprises the LED constant power driving circuit as described in any one of claims 1 to 9.

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