WO2015196893A1

WO2015196893A1 - Led lamp string control circuit and led lamp string controller

Info

Publication number: WO2015196893A1
Application number: PCT/CN2015/080282
Authority: WO
Inventors: 曾仲铨
Original assignee: 深圳彩芯智科技有限公司; 曾仲铨
Priority date: 2014-06-23
Filing date: 2015-05-29
Publication date: 2015-12-30
Also published as: CN204157099U

Abstract

An LED lamp string control circuit and an LED lamp string controller, relating to the field of LED drive control. The control circuit comprises: a time sequence control circuit board (1) and a drive control circuit board (2). The time sequence control circuit board (1) comprises: a clamping circuit (11), a first single-chip microcomputer (MCU1), a voltage-dividing circuit (12) and a reset circuit (13). The drive control circuit board (2) comprises a plurality of LED drive circuit groups (21, 22), each LED drive circuit group comprising a plurality of LED drive modules (201) connected in series. Clamping is performed on a ground end of the single-chip microcomputer so as to ensure that the single-chip microcomputer can operate at a voltage of 24V, driving of a string having hundreds of lamps is implemented via a clamped voltage powering rear level driving, thereby increasing the length of the driven lamp string and implementing a long-distance LED lamp string design, and the lamp string transmits a trigger signal, enabling lamp strings in a long design having a plurality of lamp strings to be controlled together to flash in an integrated and consistent manner, further improving a product effect.

Description

LED string light control circuit and LED light string controller

[0001] The utility model belongs to the field of LED drive control, and particularly relates to an LED light string control circuit and an LED light string controller.

Background technique

[0002] At present, Light Emitting Diodes (LEDs) have greatly increased the proportion of high-brightness, low power consumption, and long life in the market to replace traditional light sources. However, existing single-chip-driven light strings are mostly due to integrated circuits ( Integrated circuit, IC) The withstand voltage is close to 5V low voltage, but it can't work under high voltage such as 24V supply voltage. Therefore, it is connected in parallel by 5V power supply, for example, the structure shown in Figure 1, where the controller and the single chip IC1 and MCU The power supply of IC2 is connected in parallel with the 5V power supply voltage. The output signal OUT1 of the controller sends the code signal D1, and then the input signal D1 of the single chip IC1 receives the code signal D1 for decoding, and then the code signal D1 is copied into the code signal. After D2, it is transmitted to the next single chip IC2 through the output terminal Do to perform the same decoding and copying and sending operation.

[0003] However, since the withstand voltage of the single-chip IC is close to 5V, the two single-chip ICs are connected in series, and the transmission voltage is too high, causing damage to the single-chip microcomputer of the next stage, and the current generated by the LED string is large. At the same time, it is limited by the output current capability of the power supply and the current withstand of the electric wire. As a result, the number of parallel LEDs in the architecture is limited to about 25 to 50, which cannot be increased, so that the long-distance light string design cannot be realized.

technical problem

[0004] An object of the embodiments of the present invention is to provide an LED light string control circuit, which aims to solve the problem that the number of LEDs driven by the parallel LED power string control structure is small, and the long-distance light string design cannot be realized. Problem solution

Technical solution

[0005] The embodiment of the present invention is implemented as follows, an LED light string control circuit, the LED light string control circuit includes a sequence control circuit board and a drive control circuit board, and the sequence control circuit board includes: [0006] a clamp circuit, an input end of the clamp circuit is connected to an input interface of the sequence control circuit board and a first power supply voltage;

[0007] The first single chip, the power end of the first single chip is connected to the first output end of the clamp circuit, and the ground end of the first single chip is connected to the second output end of the clamp circuit, The second output end of the first single chip microcomputer is a trigger signal interface of the sequence control circuit board;

[0008] a voltage dividing circuit, an input end of the voltage dividing circuit is connected to a ground end of the first single chip microcomputer;

[0009] a reset circuit, an input end of the reset circuit is connected to an input end of the clamp circuit, a control end of the reset circuit is connected to a first output end of the first single chip, and an output of the reset circuit The terminal is the first voltage output interface and the second voltage output interface of the sequence control circuit board;

[0010] the grounding interface of the sequence control circuit board is grounded;

[0011] The driving control circuit board includes a first LED driving circuit group and M-1 second LED driving circuit groups, and each of the first LED driving circuit group or the second LED driving circuit group includes N series of LED driving modules connected in series;

[0012] the power supply end of the first LED driving circuit group is a first input voltage interface of the driving control circuit board and a first voltage output interface of the sequencing control circuit board, M-1 said a power supply end of the two LED driving circuit groups is connected to a second input voltage interface of the driving control circuit board and a second voltage output interface of the sequencing control circuit board, the first LED driving circuit group and the M-1 The grounding end of the second LED driving circuit group is connected to the grounding interface of the driving control circuit board and the grounding interface of the sequence control circuit board, and the control end of the first LED driving circuit group is The trigger signal interface of the drive control circuit board is connected to the trigger signal of the sequence control circuit board, and the control end of the mth second LED drive circuit group and the output end of the m-1th second LED drive circuit group Connection

[0013] a power supply end of the first LED driving module in each of the LED driving circuit groups is a power supply end of the LED driving circuit group, a power supply end of the nth LED driving module and an n-1th LED driving The ground terminal of the module is connected, the control end of the first LED driving module is the control end of the LED driving circuit group, the control end of the nth LED driving module and the output of the n-1th LED driving module End connection, the ground end of the Nth LED driving module is the ground end of the LED driving circuit group, and the output end of the Nth LED driving module is the output end of the LED driving circuit group;

[0014] The N and M are both natural numbers greater than 2, and the n is a natural number greater than or equal to 2 and less than or equal to N, m is a natural number greater than or equal to 2 and less than or equal to M.

[0015] Further, the sequence control circuit board and the plurality of interfaces of the drive control circuit board are connected by a four-wire flat cable.

[0016] Further, the clamping circuit comprises:

[0017] resistor Rl, resistor R4, capacitor Cl, capacitor C2, capacitor C3 and diode Dl;

[0018] One end of the resistor R1 is connected to the input end of the clamp circuit, and is connected to one end of the capacitor C1 and the capacitor C2, and the other end of the resistor R1 is opposite to the capacitor C1 and the capacitor The other end of the resistor R1 is also connected to the cathode of the diode D1, the cathode of the diode D1 is also connected to one end of the resistor R4, and the other end of the resistor R4 is The first output end of the clamp circuit is connected to one end of the capacitor C3, and the other end of the capacitor C3 is connected to the anode of the diode D1.

[0019] Further, the voltage dividing circuit comprises:

[0020] resistor R2 and resistor R3;

[0021] One end of the resistor R2 is connected to an input end of the voltage dividing circuit and one end of the resistor R3, and the other end of the resistor R2 is grounded at the same end as the other end of the resistor R3.

[0022] Further, the reset circuit includes:

[0023] a resistor R5, a resistor R6, and a first bypass tube;

[0024] one end of the resistor R5 is connected to the input end of the reset circuit and the input end of the first switch, and the other end of the resistor R5 is the control end of the reset circuit and the first The control terminal of the bypass transistor is connected, the output end of the first bypass transistor is connected to one end of the resistor R6, and the other end of the resistor R6 is an output terminal of the reset circuit.

[0025] Further, the first bypass transistor is a P-type MOS transistor, the drain of the P-type MOS transistor is an input end of the first bypass transistor, and the source of the P-type MOS transistor is extremely The output end of the first bypass tube, the gate of the P-type MOS tube is the control end of the first bypass tube.

[0026] Further, the LED driving module includes:

[0027] LED driver chip, second microcontroller, diode D2 and capacitor C11;

[0028] The power supply end of the LED driving chip is connected to the power end of the LED driving module and the power end of the second single chip, and the plurality of output ends of the LED driving chip and the plurality of second MCUs Input end One end of the capacitor C1 is the control end of the LED driving module, the other end of the capacitor C11 is connected to the first transmission interface of the second single chip, and the power end of the second single chip is also The cathode of the diode D2 is connected, the anode of the diode D2 is connected to the ground end of the LED driving module, and the output end of the second single chip is the output mountain of the LED driving module.

[0029] Further, the LED string control circuit further includes a power conversion module, wherein an input end of the power conversion module is connected to a second AC power voltage, and an output end of the power conversion module and the clamp The input end of the bit circuit is connected, and the power conversion module includes:

[0030] Resistor R21, resistor R22, resistor R23, resistor R24, resistor R25, resistor R26, resistor R27, capacitor C21, capacitor C22, capacitor C23, capacitor C24, diode D4, diode D5, diode D6, controlled rectifier device D7 , the fourth switch, optocoupler, transformer, power conversion chip and power management chip

[0031] The input end of the power conversion chip is an input end of the power conversion module, the forward output end of the power conversion chip is grounded through the capacitor C21, and the reverse output end of the power conversion chip is grounded. The forward output end of the power conversion chip is further connected to one end of the resistor R21. The other end of the resistor R21 is connected to the power end of the power management chip and one end of the resistor R22. The power supply end of the management chip is also grounded through the capacitor C22, the ground end of the power management chip is grounded, the other end of the resistor R22 is connected to the cathode of the diode D4, and the anode of the diode D4 and the transformer are The same name end of the second coil is connected, the different end of the second coil of the transformer is grounded, and one end of the resistor R 21 is also connected to the cathode of the diode D5 and the same end of the first coil of the transformer. The anode of the diode D5 is connected to the opposite end of the first coil of the transformer and the input end of the fourth bypass tube, and the output end of the fourth bypass tube passes through the resistor R23 Grounding, the control end of the fourth switch is connected to the control end of the power management chip, the select end of the power management chip is connected to the output end of the fourth switch, and the feedback end of the power management chip Connected to the optocoupler receiving input end, the optocoupler receiving output end is grounded, the optocoupler transmitting input end is connected to one end of the resistor R24, and the other end of the resistor R24 is the output of the power conversion module The terminal is connected to the cathode of the diode D6, the anode of the diode D6 is connected to the same end of the third coil of the transformer, the cathode of the diode D6 is also grounded through the capacitor C23, and the third coil of the transformer is different. Ground terminal, the optocoupler The transmitting output terminal is connected to one end of the capacitor C24 and the cathode of the controlled rectifying device D7, and the other end of the capacitor C24 is connected to one end of the resistor R25, and the other end of the resistor R25 is the same One end of the resistor R26 is connected to one end of the resistor R27, the other end of the resistor R26 is connected to the other end of the resistor R24, and the other end of the resistor R27 is the same as the anode of the controlled rectifying device D7.吋 Grounding, the control terminal of the controlled rectifying device D7 is connected to one end of the resistor R27.

[0032] Further, the LED string control circuit further includes a crystal oscillator, one end of the crystal oscillator is connected to the third output end of the first single chip, and the other end of the crystal oscillator is opposite to the first single chip The fourth output is grounded at the same time.

Another object of an embodiment of the present invention is to provide an LED light string controller using the LED string control circuit described above.

Advantageous effects of the invention

Beneficial effect

[0034] The embodiment of the present invention clamps the grounding end of the single-chip microcomputer to ensure that the single-chip microcomputer can work normally under a high DC voltage or AC voltage, and supplies power to the rear-stage driving through the clamped single-chip grounding terminal to realize LED driving. The module is connected in series and then in parallel, which can easily realize the driving of hundreds of strings, greatly increase the length of the driving string, realize the long-distance LED string design, and the string can transmit the trigger signal, so that the string is More and longer designs can also be controlled together to show an overall consistent flash method, further improving product performance.

Brief description of the drawing

DRAWINGS

1 is a structural diagram of a power supply parallel-connected string control circuit provided by the prior art;

2 is a structural diagram of an LED light string control circuit according to an embodiment of the present invention;

3 is a circuit diagram showing an example circuit of a sequence control circuit board in an LED light string control circuit according to an embodiment of the present invention;

4 is a circuit diagram showing an example circuit of a driving control circuit board in an LED light string control circuit according to an embodiment of the present invention;

5 is a circuit diagram showing an example of an AC-DC isolated sequence control circuit board in an LED lamp string control circuit according to an embodiment of the present invention. Embodiments of the invention

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0041] The embodiment of the present invention clamps the grounding end of the single-chip microcomputer to ensure that the single-chip microcomputer can work normally under the higher voltage of 24V, and supplies power to the rear-stage driving through the clamped single-chip grounding terminal, thereby realizing the LED driving module to be connected in series. The parallel connection structure greatly increases the length of the driving light string, and the light string can transmit a trigger signal, so that the light string can be jointly controlled under a large and long design to exhibit an overall uniform flashing method.

[0042] The implementation of the present invention is described in detail below in conjunction with specific embodiments:

2 shows the structure of an LED light string control circuit provided by an embodiment of the present invention. For the convenience of description, only parts related to the present invention are shown.

[0044] As an embodiment of the present invention, the LED string control circuit can be applied to any LED string controller, including the sequencing control circuit board 1 and the drive control circuit board 2;

[0045] The sequence control circuit board 1 includes:

[0046] Clamp circuit 11, the input end of the clamp circuit 11 is the input interface of the sequence control circuit board 1 and the first DC power supply voltage of 24V is connected;

[0047] The first MCU MCU1, the power terminal VDD of the first MCU1 is connected to the first output end of the clamp circuit 11, the ground terminal GND of the first MCU1 is connected with the second output end of the clamp circuit 11, The second output end of a single-chip MCU1 is a trigger signal interface PDO of the sequence control circuit board 1;

[0048] The voltage dividing circuit 12, the input end of the voltage dividing circuit 12 is connected to the ground end of the first single chip MCU1;

[0049] The reset circuit 13 has an input end connected to the input end of the clamp circuit 11, and a control end of the reset circuit 13 is connected to the first output end of the first MCU1, and the output end of the reset circuit 13 is the same. The first voltage output interface PV1+ and the second voltage output interface PV2+ of the control circuit board 1 are sequentially controlled;

[0050] The grounding interface PGND of the sequence control circuit board 1 is grounded;

[0051] The driving control circuit board 2 includes a first LED driving circuit group 21 and M-1 second LED driving circuit groups 22, and each of the first LED driving circuit group 21 or the second LED driving circuit group 22 includes N a series of LED driver modules 201; [0052] The power supply end of the first LED driving circuit group 21 is connected to the first input voltage interface PV1+ of the driving control circuit board 2 and the first voltage output interface PV1+ of the sequencing control circuit board 1, M-1 second LED driving The power supply terminals of the circuit group 22 are both the second input voltage interface PV2+ of the drive control circuit board 2 and the second voltage output interface PV2+ of the sequence control circuit board 1, the first LED drive circuit group 21 and the M-1 second The ground terminal of the LED driving circuit group 22 is connected to the grounding interface PGND of the driving control circuit board 2 and the grounding interface PGND of the sequence control circuit board 1. The control terminal of the first LED driving circuit group 21 is the driving control circuit board 2. The trigger signal interface PDO is connected to the trigger signal interface PDO of the sequence control circuit board 1, and the control end of the mth second LED driving circuit group 22 is connected to the output end of the m-1th second LED driving circuit group 22;

[0053] The power terminal of the first LED driving module 201 in each LED driving circuit group is the power terminal of the LED driving circuit group, the power terminal of the nth LED driving module 201 and the n-1th LED driving module 201 The ground terminal is connected, the control end of the first LED driving module 201 is the control end of the LED driving circuit group, and the control end of the nth LED driving module 201 is connected with the output end of the n-1th LED driving module 201, The ground end of the N LED driving module 201 is the ground end of the LED driving circuit group, and the output end of the Nth LED driving module 201 is the output end of the LED driving circuit group;

Here, N and M are both natural numbers greater than 2, n is a natural number greater than or equal to 2 and less than or equal to N, and m is a natural number greater than or equal to 2 and less than or equal to M.

[0055] In the embodiment of the present invention, the sequence control circuit board 1 can be powered by 24V DC, and the voltage of the power supply terminal of the first MCU 1 is clamped to about 5V by the clamp circuit 11, and then passed through the voltage dividing circuit 12 The potential of the grounding terminal GND of the first single chip MCU1 is increased, thereby controlling the reset circuit 13 to output two 24V voltages to supply power to the LED string.

[0056] Here, the output voltage of the reset circuit 13 is a square wave signal having a high and low level, so that after the completion of a complete flash period of the string, a low level of the square wave is generated. After the power is turned off, the subsequent LED driving module 201 can be reset by power-off, and the high-level of the square wave re-accepts the control signal to work, effectively avoiding the flashing of the LED driving module, and ensuring that the flashing of the light string is not confusing.

[0057] In the meantime, since the potential of the first MCU M1 is padded, a trigger signal can be outputted by the second output terminal 102, and the serial driving of the plurality of LED driving modules 201 is realized by the trigger signal.

[0058] In the embodiment of the present invention, the first LED driving circuit group 21 or the first LED driving module 201 of the second LED driving circuit group 22 realizes driving control after receiving the DC voltage and the control signal of 24V. And a trigger signal is re-outputted through the output end as a control signal of the next-stage LED driving module 201, and the ground end of the first LED driving module 201 outputs a higher voltage for clamping as the latter-level LED. The power supply of the driving module 201, the voltage of the grounding terminal is generally lower than the received power supply voltage by about 4.8V, that is, the driving voltage required in the LED driving module 201. Therefore, when the input voltage is 24V, an LED driving circuit group is generally Five LEDs can be driven in series.

[0059] wherein, the grounding ends of the first four LED driving modules 201 are all driving voltages provided by the rear LED driving module 201, and the grounding end of the fifth LED driving module 201 (or the last LED driving module) is directly driven. The ground terminal of the control circuit board 2 is connected, and the output end of the fifth LED driving module 201 (or the last LED driving module) outputs a trigger signal to the control end of the first LED driving module in the next LED driving circuit group. . At the same time, the power supply end of the next group of LED driving circuit groups is directly connected with the input voltage interface of the driving control circuit board 2, and the 24V DC voltage is transmitted to the next group of LED driving circuit groups, and five LED driving modules are connected in series to form one. The LED driving circuit group has a structure in which a plurality of groups of LED driving circuit groups are connected in parallel, thereby being adapted to realize LED string driving at a higher voltage of 24V.

[0060] It should be noted that the input end of the clamp circuit in the embodiment of the present invention can be connected to a relatively high DC power, such as 24V, 36V DC voltage, or can be connected between 85V and 265V AC power, when the clamp circuit After connecting with the AC, a power conversion circuit should be added between the AC and the clamp circuit for AC-DC conversion.

[0061] The embodiment of the present invention clamps the grounding end of the single-chip microcomputer to ensure that the single-chip microcomputer can work normally under a high DC voltage or AC voltage, and supplies power to the rear-stage driving through the clamped single-chip grounding terminal to realize LED driving. The module is connected in series and then in parallel, which can easily realize the driving of hundreds of strings, greatly increase the length of the driving string, realize the long-distance LED string design, and the string can transmit the trigger signal, so that the string is More and longer designs can also be controlled together to show an overall consistent flash method, further improving product performance.

3 shows an exemplary circuit configuration of a sequence control circuit board in an LED lamp string control circuit according to an embodiment of the present invention. For convenience of description, only parts related to the present invention are shown.

[0063] As an embodiment of the present invention, the sequence control circuit board 1 and the plurality of interfaces of the drive control circuit board 2 are connected by a four-wire flat cable.

[0064] In the embodiment of the present invention, in order to achieve the above four-wire control circuit, four can be used in actual production. The line flat cable connects the first output voltage interface PV1+, the second output voltage interface P V2+ , the trigger signal interface PDO and the ground interface PGND of the sequence control circuit board 1 to the first output voltage interface PVl+ of the drive control circuit board 2, respectively. The two output voltage interfaces PV2+, the trigger signal interface PDO and the ground interface PGND are connected one-to-one. Therefore, in the mass production processing, the drive control circuit board 2 can be directly connected to the sequence control circuit board 1 through the four-wire flat cable, thereby achieving the purpose of simple production.

[0065] As an embodiment of the present invention, the clamp circuit 11 includes:

[0066] a resistor R1, a resistor R4, a capacitor Cl, a capacitor C2, a capacitor C3, and a diode D1;

[0067] One end of the resistor R1 is connected to the input end of the clamp circuit 11 and is connected to one end of the capacitor C1 and the capacitor C2, and the other end of the resistor R1 is grounded to the other end of the capacitor C1 and the capacitor C2, and one end of the resistor R1 is further Connected to the cathode of the diode D1, the cathode of the diode D1 is also connected to one end of the resistor R4, the other end of the resistor R4 is the first output end of the clamp circuit 11 is connected to one end of the capacitor C3, and the other end of the capacitor C3 is a clamp circuit. The second output of 11 is coupled to the anode of diode D1.

[0068] The voltage dividing circuit 12 includes:

[0069] resistor R2 and resistor R3;

[0070] One end of the resistor R2 is connected to the input end of the voltage dividing circuit 12 and one end of the resistor R3, and the other end of the resistor R2 is grounded to the other end of the resistor R3.

[0071] The reset circuit 13 includes:

[0072] a resistor R5, a resistor R6, and a first bypass transistor Q1;

[0073] One end of the resistor R5 is connected to the input end of the first switching transistor Q1, and the other end of the resistor R5 is connected to the control end of the first switching transistor Q1. The output of the first switch Q1 is connected to one end of the resistor R6, and the other end of the resistor R6 is the output of the reset circuit 13.

[0074] As a preferred embodiment of the present invention, the first bypass transistor Q1 is a P-type MOS transistor or a thyristor, and the drain of the P-type MOS transistor is the input end of the first bypass transistor Q1, and the source of the P-type MOS transistor It is extremely first to close the output end of Q1, and the gate of the P-type MOS tube is the control end of the first bypass tube Q1.

[0075] In the embodiment of the present invention, the input end of the clamp circuit 11 is 24V DC power supply, the power supply terminal voltage of the first single chip MCU1 is clamped at 5.1V through the Zener diode D1, and then the resistor R2 and the resistor R3 are passed. The voltage drop increases the potential of the grounding terminal GND of the first microcontroller MCU1, thereby controlling the first switching transistor Q1 to supply the string. At the same time, since the ground potential of the first MCU M1 is raised, it can be directly The trigger signal is output through the trigger signal interface PDO.

[0076] As a preferred embodiment of the present invention, the multi-mode LED string control circuit may further include a first crystal oscillator J1;

[0077] One end of the first crystal oscillator J1 is connected to the third output terminal 103 of the first single chip MCU1, and the other end of the first crystal oscillator J1 is grounded together with the fourth output terminal of the first single chip MCU1.

[0078] By externally connecting the first crystal oscillator J1 to the first single chip MCU1, the light strings controlled by the plurality of sets of the first single chip MCU1 can be combined together, because the first crystal oscillator J1 makes the working frequency of the first MCU1 more accurate, for example, an external one. The 12MHz crystal oscillator can make multiple sets of light strings work all night (12 hours). The difference between resets is less than 1 second, so that the sequence and effect of all the strings can be consistent without flashing each other. The chaos of the order.

4 shows an exemplary circuit configuration of a driving control circuit board in an LED lamp string control circuit according to an embodiment of the present invention. For the convenience of description, only parts related to the present invention are shown.

[0080] As an embodiment of the present invention, the LED driving module 201 includes:

[0081] red LED light emitting chip LED_R, green LED light emitting chip LED_G, blue LED light emitting chip LED _B, second single chip, diode D2 and capacitor C11;

[0082] The red LED light emitting chip LED_R, the green LED light emitting chip LED_G, the blue LED light emitting chip LED_B, the power terminal is the power terminal of the LED driving module 201 and the power terminal of the second single chip, the red LED light emitting chip LED_R The output terminals of the green LED light emitting chip LED_G and the blue LED light emitting chip LED_B are respectively connected to the plurality of input terminals 101, 102, 103 of the second single chip microcomputer, and one end of the capacitor C11 is the control end of the LED driving module 201, and the capacitor CI 1 The other end is connected to the fifth transmission interface 105 of the second single chip microcomputer, the power supply terminal VDD of the second single chip is also connected to the cathode of the diode D2, and the anode of the diode D2 is the ground terminal of the LED driving module 201 and the grounding end GND of the second single chip microcomputer. Connected, the fourth output 104 of the second microcontroller is the output of the LED driver module 201.

[0083] It can be understood that the LED driving module 201 can be disposed on the driving control circuit board 2 in the form of a PCB (Printed Circuit Board), or can be integrated into the LED lamp.

In the embodiment of the present invention, since the ground potential of the first MCU M1 is padded, the trigger signal can be directly output through the trigger signal interface PD0, and the first group of LED driving circuits connected in series to the string is connected. Group, and the LED driving module 201 in the LED driving circuit group is driven by a second single chip MCU2 The LED driving chip, the LED driving chip clamps the working voltage to about 5V through the Zener diode D2, and couples the trigger signal sent by the first single chip MCU1 through the capacitor C11, since the trigger signal is only a hopping signal, The second MCU 2 can be driven by the capacitor C11 to control the blinking of the RGB LED driven by the LED driving chip, and the trigger signal is output through the output terminal thereof, and the capacitor is coupled to the next LED driving module through the serial connection, and the repeated control is performed. To control the work of the entire string

[0085] The LED driving module structure in the driving control circuit board 2 provided by the embodiment of the present invention adopts five groups in series and multiple groups in parallel to adapt to the situation of 24V power supply.

5 shows an example circuit structure of an AC-DC isolated sequence control circuit board in an LED light string control circuit provided by an embodiment of the present invention. For convenience of description, only the related to the present invention is shown. section

[0087] In the embodiment of the present invention, in order to further meet the requirement of the user to apply the module in an AC environment, an AC-DC conversion circuit may be added between the clamp circuit 11 and the power source, and specifically AC- DC isolated circuit structure.

[0088] As an embodiment of the present invention, the LED string control circuit may further include a power conversion module 14, the input end of the power conversion module 14 is connected with a second AC power voltage between 85V and 285V, and the power conversion module The output of the 14 is connected to the input of the clamp circuit 11, and the power conversion module 14 includes:

[0089] Resistor R21, resistor R22, resistor R23, resistor R24, resistor R25, resistor R26, resistor R27, capacitor C21, capacitor C22, capacitor C23, capacitor C24, diode D4, diode D5, diode D6, controlled rectifier device D7 , the fourth switch Q4, the optocoupler Ul, the transformer, the first rectifier bridge stack UR1 and the power management chip IC3;

[0090] The two AC input ends of the first rectifier bridge stack UR1 are the input ends of the power conversion module 14, the DC positive output terminal of the first rectifier bridge stack UR1 is grounded through the capacitor C21, and the DC negative output terminal of the first rectifier bridge stack UR1 Grounding, the DC positive output of the first rectifier bridge stack UR1 is also connected to one end of the resistor R21, and the other end of the resistor R21 is connected to the power supply terminal VDD of the power management chip IC3 and one end of the resistor R22, and the power supply chip IC3 is powered. The terminal VDD is also grounded through the capacitor C22, the ground terminal GND of the power management chip IC3 is grounded, the other end of the resistor R22 is connected to the cathode of the diode D4, the anode of the diode D4 is connected to the same name end of the second coil L2 of the transformer, and the second coil L2 of the transformer The opposite end is grounded, and one end of the resistor R21 is also the same 吋 is connected with the cathode of the diode D5 and the same name end of the first coil LI of the transformer, and the anode of the diode D5 is connected to the opposite end of the first coil L1 of the transformer and the input end of the fourth bypass tube Q4, and the fourth switch The output end of Q4 is grounded through a resistor R23, and the control end of the fourth switch Q4 is connected to the control end Gate of the power management chip IC3, and the selection end CS of the power management chip IC3 is connected to the output end of the fourth switch Q4, the power supply The feedback terminal FE of the management chip IC3 is connected to the receiving end of the optocoupler U1, the optocoupler U1 receives the output terminal grounded, the optocoupler U1 transmitting input end is connected to one end of the resistor R24, and the other end of the resistor R24 is the output end of the power conversion module 14. Connected to the cathode of the diode D6, the anode of the diode D6 is connected to the same name end of the third coil L3 of the transformer, the cathode of the diode D6 is also grounded through the capacitor C23, the different name end of the third coil L3 of the transformer is grounded, and the output end of the optocoupler U1 is the same One end of the capacitor C24 is connected to the cathode of the controlled rectifying device D7, the other end of the capacitor C24 is connected to one end of the resistor R25, and the other end of the resistor R25 is the same as the end of the resistor R26. One end of R27 is connected to the other end and the other end of the resistor R26 and the resistor R24 is connected to the other end of the anode terminal of the controlled rectifier elements _D7, a resistor R27 with the ground inch, the control terminal of the controlled rectifier elements D7 and resistor R2 7 is connected .

[0091] It can be understood that the first rectifier bridge stack UR1 can also be replaced by four M7 type high voltage rectifier tubes, or replaced by integrated circuit chips with the same function.

[0092] The fourth bypass transistor Q4 can be implemented by an N-type MOS transistor or a corresponding thyristor, the drain of the N-type MOS transistor is the input end of the fourth bypass transistor Q4, and the source of the N-type MOS transistor is extremely fourth. At the output of the tube Q4, the gate of the N-type MOS transistor is the control terminal of the fourth bypass transistor Q4. As a preferred embodiment of the present invention, the controlled rectification device D7 can be implemented by using a 431 type voltage regulator chip.

[0093] In the embodiment of the present invention, the power conversion module 13 is a reverse-ride AC-DC circuit, wherein the resistor R26 and the resistor R27 divide the voltage of the output terminal, and feedback back to the power management chip IC3 by using the optocoupler U1. As the feedback signal, the terminal FB senses the voltage of the fourth switch Q 4 flowing through the resistor R23 through the selection terminal CS of the power management chip IC3, and compares the voltages outputted by the secondary side of the circuit through the two signals. The value is: D7-[(R26/R27)+1], where D7 is the operating voltage of the controlled rectifier device D7 (such as the 431 regulator chip), and R26 and R27 are the resistance values of the resistor R26 and the resistor R27, for example, The 431 type regulator chip maintains a balanced voltage of about 2.5V after power supply. If the output voltage of the secondary side is designed to be 24V, the voltage divider value of the resistor R26 and the resistor R27 must be transmitted back via the 431 regulator chip. The voltage is fed back to the power management chip IC3 so that the power conversion module 13 outputs a DC voltage of 24V to supply power to the drive control circuit board 2. [0094] Moreover, the multi-mode LED string control circuit may also include a first crystal oscillator J1;

[0095] One end of the first crystal oscillator J1 is connected to the third output terminal 103 of the first single chip MCU1, and the other end of the first crystal oscillator J1 is grounded together with the fourth output terminal of the first single chip MCU1.

[0096] By externally connecting the first crystal oscillator J1 to the first single-chip MCU1, the light strings controlled by the plurality of sets of the first single-chip MCU1 can be combined together, because the first crystal oscillator J1 makes the working frequency of the first MCU1 more accurate, for example, an external one. The 12MHz crystal oscillator can make multiple sets of light strings work all night (12 hours). The difference between resets is less than 1 second, so that the sequence and effect of all the strings can be consistent without flashing each other. The chaos of the order. Another object of the embodiments of the present invention is to provide an LED light string controller using the LED string control circuit described above.

[0097] The embodiment of the present invention clamps the grounding end of the single-chip microcomputer to ensure that the single-chip microcomputer can work normally under a high DC voltage or AC voltage, and supplies power to the rear-stage driving through the clamped single-chip grounding terminal to realize LED driving. The module is connected in series and then in parallel, which can easily realize the driving of hundreds of strings, greatly increase the length of the driving string, realize the long-distance LED string design, and the string can transmit the trigger signal, so that the string is More and longer designs can also be controlled together to show an overall consistent flash method, further improving product performance. At the same time, the embodiment of the utility model can also realize the technology of connecting long and long distance multiple number lamp groups through the four-wire flat cable, simplifying and accelerating the production process, breaking the current market, the single-chip light string is complicated and difficult to produce, and cannot be connected with multiple lamps. Stretching the distance between the string and other problems.

The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalents, and improvements made within the spirit and principles of the present invention should be included in the present invention. Within the scope of protection of the present invention.

Claims

Claim

[Claim 1] An LED light string control circuit, wherein the LED light string control circuit includes a sequence control circuit board and a drive control circuit board, and the sequence control circuit board includes: a clamp circuit, The input end of the clamp circuit is connected to the first power supply voltage of the input interface of the sequence control circuit board;

a first one-chip computer, wherein a power terminal of the first single chip is connected to a first output end of the clamp circuit, and a ground end of the first single chip is connected to a second output end of the clamp circuit, the first The second output end of the single chip microcomputer is a trigger signal interface voltage dividing circuit of the sequence control circuit board, the input end of the voltage dividing circuit is connected with the ground end of the first single chip; the reset circuit, the input of the reset circuit The terminal is connected to the input end of the clamp circuit, the control end of the reset circuit is connected to the first output end of the first single chip, and the output end of the reset circuit is the same as the sequence control circuit board a first voltage output interface and a second voltage output interface;

Grounding interface of the sequence control circuit board is grounded;

The driving control circuit board includes a first LED driving circuit group and M-1 second LED driving circuit groups, and each of the first LED driving circuit group or the second LED driving circuit group includes N serial devices. The LED driving module;

The power supply end of the first LED driving circuit group is connected to the first voltage output interface of the driving control circuit board and the first voltage output interface of the sequencing control circuit board, and M-1 the second LED driving The power supply end of the circuit group is connected to the second input voltage interface of the drive control circuit board and the second voltage output interface of the sequence control circuit board, the first LED drive circuit group and the M-1 The grounding end of the second LED driving circuit group is connected to the grounding interface of the driving control circuit board and the grounding interface of the sequence control circuit board, and the control end of the first LED driving circuit group is the driving control a trigger signal interface of the circuit board is connected to a trigger signal of the sequence control circuit board, and a control end of the mth second LED drive circuit group is connected to an output end of the m-1 second LED drive circuit group; a power supply end of the first LED driving module in the LED driving circuit group is the L a power supply end of the ED driving circuit group, a power end of the nth LED driving module is connected to a ground end of the n-1th LED driving module, and a control end of the first LED driving module is a control end of the LED driving circuit group a control end of the nth LED driving module is connected to an output end of the n-1th LED driving module, and a ground end of the Nth LED driving module is a ground end of the LE D driving circuit group, An output end of the N LED driving modules is an output end of the LED driving circuit group;

The N and M are both natural numbers greater than 2, and the n is a natural number greater than or equal to 2 and less than or equal to N, and the m is a natural number greater than or equal to 2 and less than or equal to M.

The LED string control circuit according to claim 1, wherein said sequence control circuit board and said plurality of interfaces of said drive control circuit board are connected by a four-wire flat cable. The LED string control circuit according to claim 1, wherein the clamp circuit comprises:

Resistor Rl, resistor R4, capacitor Cl, capacitor C2, capacitor C3, and diode D1;

One end of the resistor R1 is connected to the input end of the clamp circuit, and is connected to one end of the capacitor C1 and the capacitor C2, and the other end of the resistor R1 is opposite to the capacitor C1 and the capacitor C2. One end of the resistor R1 is also connected to the cathode of the diode D1, the cathode of the diode D1 is also connected to one end of the resistor R4, and the other end of the resistor R4 is the clamp circuit. The first output terminal is connected to one end of the capacitor C3, and the other end of the capacitor C3 is connected to the anode of the diode D1.

The LED string control circuit according to claim 1, wherein the voltage dividing circuit comprises:

Resistor R2 and resistor R3;

One end of the resistor R2 is connected to an input end of the voltage dividing circuit and one end of the resistor R3, and the other end of the resistor R2 is grounded to the other end of the resistor R3.

The LED string control circuit according to claim 1, wherein the reset circuit comprises:

a resistor R5, a resistor R6, and a first bypass tube; One end of the resistor R5 is connected to the input end of the reset circuit and the input end of the first switch, and the other end of the resistor R5 is the control end of the reset circuit and the first switch The control terminal is connected, the output end of the first bypass transistor is connected to one end of the resistor R6, and the other end of the resistor R6 is an output end of the reset circuit.

[Claim 6] The LED string control circuit of claim 5, wherein the first bypass transistor is a P-type MOS transistor, and the drain of the P-type MOS transistor is the first bypass The input end of the tube, the source of the P-type MOS tube is the output end of the first bypass tube, and the gate of the P-type MOS tube is the control end of the first bypass tube.

[Claim 7] The LED string control circuit according to claim 1, wherein the LED driving module comprises:

Red LED light-emitting chip, green LED light-emitting chip, blue LED light-emitting chip, second single chip machine, diode D2 and capacitor C11;

The power supply end of the red LED light emitting chip, the green LED light emitting chip, and the blue LED light emitting chip is connected to the power end of the LED driving module and the power end of the second single chip, the red LED The output ends of the light-emitting chip, the green LED light-emitting chip, and the blue LED light-emitting chip are respectively connected to a plurality of input ends of the second single-chip microcomputer, and one end of the capacitor C11 is a control end of the LED driving module. The other end of the capacitor C11 is connected to the fifth transmission interface of the second single chip, the power terminal of the second single chip is also connected to the cathode of the diode D2, and the anode of the diode D2 is the L ED drive. The ground end of the module is connected to the ground end of the second single chip, and the fourth output end of the second single chip is an output end of the LED driving module.

The LED string control circuit of claim 1 , wherein the LED string control circuit further comprises a power conversion module, the input end of the power conversion module and the second AC power voltage The output of the power conversion module is connected to the input end of the clamp circuit, and the power conversion module includes:

Resistor R21, resistor R22, resistor R23, resistor R24, resistor R25, resistor R26, resistor R27, capacitor C21, capacitor C22, capacitor C23, capacitor C24, diode D4, diode D5, diode D6, controlled rectifier device D7, fourth幵 Guan, optocoupler, transformer, number a rectifier bridge stack and a power management chip;

The two AC input ends of the first rectifier bridge stack are the input ends of the power conversion module, and the DC positive output terminals of the first rectifier bridge stack are grounded through the capacitor C21, and the DCs of the first rectifier bridge stack The negative output terminal is grounded, the DC positive output end of the first rectifier bridge stack is further connected to one end of the resistor R21, and the other end of the resistor R21 is the same as the power supply end of the power management chip and the resistor R22 The power supply end of the power management chip is also grounded through the capacitor C22, the ground end of the power management chip is grounded, and the other end of the resistor R22 is connected to the cathode of the diode D4, the diode D4 The anode is connected to the same end of the second coil of the transformer, the different end of the second coil of the transformer is grounded, and one end of the resistor R21 is also the same as the cathode of the diode D5 and the first coil of the transformer. Connected to the same end, the anode of the diode D5 is connected to the opposite end of the first coil of the transformer and the input end of the fourth switch, the fourth The output end of the switch is grounded through the resistor R23, and the control end of the fourth switch is connected to the control end of the power management chip, and the selection end of the power management chip and the output end of the fourth switch Connecting, the feedback end of the power management chip is connected to the optocoupler receiving input end, the optocoupler receiving output end is grounded, the optocoupler transmitting input end is connected to one end of the resistor R24, and the resistor R24 is The other end is connected to the cathode of the diode D6, the anode of the diode D6 is connected to the same end of the third coil of the transformer, and the cathode of the diode D6 is also passed through the capacitor C23. Grounding, the different name end of the third coil of the transformer is grounded, the optocoupler output end is connected to one end of the capacitor C24 and the cathode of the controlled rectifying device D7, and the other end of the capacitor C24 is One end of the resistor R25 is connected, and the other end of the resistor R25 is connected to one end of the resistor R26 and one end of the resistor R27, and the other end of the resistor R26 The other end of the resistor R24 is connected to the other end of the resistor and the anode of the controlled rectifier device with ground inch D7, R27 of the controlled control terminal of the resistor R27 is connected to one end of the rectifier elements D7.

[Claim 9] The LED string control circuit according to any one of claims 1 to 8, wherein

The LED string control circuit further includes a crystal oscillator, one end of the crystal oscillator and the first single chip microcomputer The third output terminal is connected, and the other end of the crystal oscillator is grounded at the same time as the fourth output end of the first single chip microcomputer.

[Claim 10] A LED string controller, characterized in that the LED string controller comprises the LED string control circuit of claim 9.