Linear thyristor dimming full-voltage constant power input circuit

Abstract

The application relates to a linear thyristor light-adjusting full-voltage constant-power input circuit, wherein a thyristor light adjuster is arranged in communication with an external voltage in front of an input protection circuit, a bridge rectifier circuit is arranged at the rear end of the input protection circuit, an output end of the input protection circuit is connected with a voltage conversion detection circuit, the voltage conversion detection circuit is connected with a full-voltage control circuit, a power supply resistor R11 is connected with the output end of the bridge rectifier circuit, the power supply resistor R11 is connected with the full-voltage control circuit, a series-parallel conversion circuit is connected with the full-voltage control circuit, and an isolation circuit is connected with the series-parallel conversion circuit, wherein four groups of full-balance circuits, reference position circuits, lamp string circuits and filter circuits are arranged respectively, the full-balance circuits, the reference position circuits and the lamp string circuits are connected correspondingly, the filter circuits are connected in parallel at both ends of the lamp string circuit, and the isolation circuit is connected between the full-balance circuit and the reference position circuit. The input circuit can realize full-voltage constant-power input, has strong universality and low cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of LED circuit, in particular to a linear thyristor dimming full-voltage constant power input circuit. BACKGROUND

[0002] With the continuous improvement of modern life quality, people's requirements for light have also been constantly improved, so various lamps appear on the market, such as dimming and color changing lamps, and fantasy lamps. Since the thyristor dimmer is widely used in traditional lighting markets such as incandescent lamps, it is simple and easy for consumers to use, and it meets people's usage habits, so the promotion of LED thyristor has good market prospects. However, the existing LED thyristor dimming technology has defects. Referring to the attached Figure 1 The input voltage in the circuit is single, only 120 / 220V segmented voltage input can be made, and the so-called full-voltage input is 85-264Vac, which cannot achieve full-voltage input. The current is not constant when the input voltage is switched from 120V to 220V, which can easily lead to uneven dimming, flickering light, and the circuit is not suitable for other voltages such as American and European standards, and has poor universality and high manufacturing cost. In addition, the existing circuit does not meet the THD and stroboscopic requirements of the new ERP regulations of the European standard, and cannot pass the ERP regulation certification.

[0003] Therefore, it is necessary to provide an integrated DALI dimming and color changing circuit to solve the above problems. SUMMARY

[0004] The present application aims to overcome the deficiencies and defects of the prior art, and provides a linear thyristor dimming full-voltage constant power input circuit, which uses a thyristor full-voltage input, is suitable for multiple voltage segment inputs, has strong universality, and low cost.

[0005] The present application is achieved by the following technical solutions:

[0006] The application discloses a linear thyristor dimming full-voltage constant power input circuit, which comprises a thyristor dimmer, an input protection circuit, a bridge rectifier circuit, a voltage conversion detection circuit, a full-voltage control circuit, a series-parallel conversion circuit, a full-balance circuit, a reference bit circuit, a lamp string circuit, a filter circuit and an isolation circuit, the thyristor dimmer is connected at the front end of the input protection circuit, the bridge rectifier circuit is connected at the rear end of the input protection circuit, the output end of the input protection circuit is connected with the voltage conversion detection circuit, the voltage conversion detection circuit is connected with the full-voltage control circuit, the output end of the bridge rectifier circuit is connected with a power supply resistor R11, the other end of the power supply resistor R11 is connected with the full-voltage control circuit, the series-parallel conversion circuit is connected with the full-voltage control circuit, the isolation circuit is connected with the series-parallel conversion circuit, the full-balance circuit, the reference bit circuit, the lamp string circuit and the filter circuit are respectively provided with four groups, and the full-balance circuit, the reference bit circuit and the lamp string circuit are correspondingly connected, the filter circuit is connected in parallel at both ends of the lamp string circuit, and the isolation circuit is connected between the full-balance circuit and the reference bit circuit.

[0007] As a preferred technical scheme of the application, the input protection circuit is provided with a live wire L and a zero wire N for external power supply, the thyristor dimmer is connected in series on the live wire L, a fuse F1 is connected at the rear end of the thyristor dimmer, and an adjustable resistor V1 is connected across the live wire L and the zero wire N.

[0008] As a preferred technical scheme of the application, the bridge rectifier circuit is provided with a rectifier bridge BD1, a transient diode RTVS, a capacitor CV1 and a voltage stabilizing diode Z1, the rectifier bridge BD1 is connected with the live wire L and the zero wire N at the front end, the capacitor CV1 is connected across the rear end of the rectifier bridge BD1, the transient diode RTVS is connected in series between the rectifier bridge BD1 and the capacitor CV1, and the voltage stabilizing diode Z1 is connected in parallel at the rear end of the capacitor CV1.

[0009] As a preferred technical scheme of the application, the voltage conversion detection circuit is provided with a resistor R1, a resistor R2 and a capacitor C3, the resistor R1 is connected with the input protection circuit, the resistor R2 is connected in series at the rear end of the resistor R1, the capacitor C3 is connected in parallel at both ends of the resistor R2, and the capacitor C3 is connected with the full-voltage control circuit.

[0010] As a preferred technical scheme of the present application, the full pressure control circuit is provided with the controller U1 and the controller U2 in parallel, and the rear end of the power supply resistor R11 is connected with the VIN terminal of the controller U1 and the controller U2 respectively, the RXT1 terminal of the controller U1 and the controller U2 is connected with the high-voltage current setting resistor R3 and R6 respectively, the RXT2 terminal of the controller U1 and the controller U2 is connected with the low-voltage current setting resistor R4 and R7 respectively, and the other end of the high-voltage current setting resistor R3, R6 and the low-voltage current setting resistor R4, R7 is connected with the capacitor C3, and the capacitor C3 is also connected with the BUS terminal of the controller U1 and the controller U2.

[0011] As a preferred technical scheme of the present application, the series-parallel conversion circuit is provided with the MOS tube Q1 and the voltage stabilizing diode ZD7, the source of the MOS tube is connected with the bridge rectifier circuit, the gate of the MOS tube is connected with the resistor R12, the other end of the resistor R12 is connected with the resistor R11, one end of the voltage stabilizing diode ZD7 is connected with the drain of the MOS tube, the other end of the voltage stabilizing diode ZD7 is connected with the gate of the MOS tube, and the gate of the MOS tube is also connected with the EN terminal of the controller U1.

[0012] As a preferred technical scheme of the present application, the full balance circuit is provided with circuit boards U3, U4, U5 and U6, the reference bit circuit is provided with resistors RS3, RS4 and a voltage stabilizing diode ZD3 connected in parallel, resistors RS5, RS6 and a voltage stabilizing diode ZD4 connected in parallel, resistors RS7, RS8 and a voltage stabilizing diode ZD5 connected in parallel, resistors RS9, RS10 and a voltage stabilizing diode ZD6 connected in parallel, the lamp string circuit is provided with a first lamp string circuit, a second lamp string circuit, a third lamp string circuit and a fourth lamp string circuit, and the OUT terminal of the circuit board U3 is connected to the rear end of the bridge rectifier circuit, and the OUT terminal of the circuit board U3 is connected to one end of the first lamp string circuit, the other end of the first lamp string circuit is connected to the OUT terminal of the circuit board U4, the two ends of the resistors RS3, RS4 and the voltage stabilizing diode ZD3 are respectively connected to the REXT and GND terminals of the circuit board U3, and one end of the resistors RS3, RS4 and the voltage stabilizing diode ZD3 is further connected to a resistor R8 and a diode D1 connected in parallel, the other end of the resistor R8 and the diode D1 is connected to the OUT terminal of the circuit board U4, one end of the second lamp string circuit is connected to the GND terminal of the circuit board U3, the other end of the second lamp string circuit is connected to the REXT terminal of the circuit board U4, the two ends of the resistors RS5, RS6 and the voltage stabilizing diode ZD4 are respectively connected to the REXT and GND terminals of the circuit board U4, one end of the resistors RS5, RS6 and the voltage stabilizing diode ZD4 is connected to an isolation circuit, the other end of the isolation circuit is connected to the OUT terminal of the circuit board U5, the two ends of the fourth lamp string circuit are respectively connected to the OUT terminals of the circuit boards U5 and U6, the two ends of the resistors RS7, RS8 and the voltage stabilizing diode ZD5 are respectively connected to the REXT and GND terminals of the circuit board U5, and one end of the resistors RS7, RS8 and the voltage stabilizing diode ZD5 is further connected to a resistor R9 and a diode D3 connected in parallel, the other end of the resistor R9 and the diode D3 is connected to the OUT terminal of the circuit board U6, one end of the fourth lamp string circuit is connected to the GND terminal of the circuit board U5, the other end of the fourth lamp string circuit is connected to the REXT terminal of the circuit board U6, the two ends of the resistors RS9, RS10 and the voltage stabilizing diode ZD6 are respectively connected to the REXT and GND terminals of the circuit board U6, and one end of the resistors RS9, RS10 and the voltage stabilizing diode ZD6 is connected to the OUT2 terminal of the controller U2.

[0013] As a preferred technical scheme of the present application, the lamp string circuit is provided with a plurality of LED lamp beads connected in series, and four of the LED lamp beads are 1800K-7500K arbitrary color temperature lamp beads.

[0014] As a preferred technical scheme of the present application, the filter circuit is provided with a resistor RD and a capacitor CP connected in parallel.

[0015] Compared with the prior art, the present application has the following beneficial effects:

[0016] 1. The silicon-controlled dimmer of the present application can adopt the general dimmer of the market, so that the circuit of the present application can be used for voltage segment input of American standard, European standard, and national standard without replacing any element.

[0017] 2. No specific degree needs to be programmed, and the present application can use general full-voltage switching IC and single-segment linear constant-current IC, which is convenient to purchase and has strong universality.

[0018] 3. The electronic elements have strong replaceability, all products of the present application adopt general electronic elements on the market, all electronic elements can be found in multiple suppliers, and only electronic elements with the same parameters and performance can be selected, so that the problem of lack of goods and long delivery time in a supplier is avoided, and multiple selection and more diversified selection are realized.

[0019] 4. Easy to pass the certification, the linear drive of the present application eliminates the switching frequency problem, no disturbance is generated when the MOS is turned on and turned off, no conducted and radiated disturbance is generated, and no additional safety device is needed to save cost.

[0020] 5. Smooth dimming without flicker, and no flicker phenomenon occurs in the process.

[0021] 6. Easy to integrate, the present application realizes the scheme without a large transformer and numerous safety devices, the volume can be extremely small, which greatly facilitates integration into LED lamps, becomes a light source integrated with the driver and the lamp, and reduces the volume and weight of the lamp. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The prior art is an LED silicon-controlled dimming circuit.

[0023] Figure 2 The present application is a full-voltage constant-power input circuit of a silicon-controlled dimming circuit.

[0024] Figure 3 The present application is a full-voltage constant-power input circuit of a silicon-controlled dimming circuit. DETAILED DESCRIPTION

[0025] The present application will be further described in detail below in combination with the embodiments and the drawings, but the embodiments of the present application are not limited thereto.

[0026] In the description of the present application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "connection" and the like should be understood in a broad sense, for example, "connection" can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0028] As shown in Figures 2-3 The specific implementation process of the present application is as follows: a linear SCR dimming full-voltage constant power input circuit, comprising a SCR dimmer 1, an input protection circuit 2, a bridge rectifier circuit 3, a voltage conversion detection circuit 4, a full-voltage control circuit 5, a series-parallel conversion circuit 6, a full-balance circuit 7, a reference bit circuit 8, a lamp string circuit 9, a filter circuit 10 and an isolation circuit 11, wherein the SCR dimmer 1 can adopt a general dimmer of national standard, American standard and European standard on the market, improving the universality of the circuit, connecting the SCR dimmer 1 at the front end input voltage of the input protection circuit 2, then connecting the bridge rectifier circuit 3 at the rear end of the input protection circuit 2, converting the input AC point into DC, at the same time protecting the entire circuit system from damage by external power grid surge voltage, connecting the output end of the input protection circuit 2 with the voltage conversion detection circuit 4, connecting the other end of the voltage conversion detection circuit 4 with the full-voltage control circuit 5, detecting the input voltage to the full-voltage controller for input judgment, thereby controlling the series-parallel output of the lamp string, the output end of the bridge rectifier circuit 3 is connected with a power supply resistor R11, and the other end of the power supply resistor R11 is connected with the full-voltage control circuit 5, thereby providing working voltage for the controller, then connecting the series-parallel conversion circuit 6 with the full-voltage control circuit 5, for executing the series-parallel conversion signal output by the full-voltage controller, and working the lamp string circuit 9 in series or in parallel; in addition, the full-balance circuit 7, the reference bit circuit 8, the lamp string circuit 9 and the filter circuit 10 are respectively provided with four groups, each group of the full-balance circuit 7, the reference bit circuit 8 and the lamp string circuit 9 is correspondingly connected, and the filter circuit 10 is connected in parallel at both ends of the lamp string circuit 9, filtering the voltage and current ripple of the output, and the isolation circuit 11 is connected with the series-parallel conversion circuit 6, and the isolation circuit 11 is further connected between the full-balance circuit and the reference bit circuit, which can prevent the controller from interfering with each other in realizing series-parallel work, thereby realizing the SCR dimming function.

[0029] Further, the full voltage control circuit 5 is provided with the controller U1 and the controller U2 in parallel, and the back end of the power supply resistor R11 is connected with the VIN terminal of the controller U1 and the controller U2 respectively, the RXT1 terminal of the controller U1 and the controller U2 is connected with the high-voltage current setting resistor R3, R6 respectively, the RXT2 terminal of the controller U1 and the controller U2 is connected with the low-voltage current setting resistor R4, R7 respectively, and the other end of the high-voltage current setting resistor R3, R6 and the low-voltage current setting resistor R4, R7 is connected with the capacitor C3, and the capacitor C3 is also connected with the BUS terminal of the controller U1 and the controller U2. By connecting the voltage conversion circuit 4 with the full voltage controller, the input voltage is detected to the full voltage controller to make input judgment, so as to control the series-parallel output of the lamp string and realize the dimming function.

[0030] Further, the lamp string circuit 9 is provided with several series-connected LED lamp beads, and four groups of LED lamp beads are provided with 1800K-7500K arbitrary section color temperature lamp beads, and LED lighting lamp beads are adopted, and the packaging can be 2835 or 3030 or 3535 or other common LED lamp beads in the market.

[0031] Further, the filter circuit 11 is provided with the resistor RD and the capacitor CP in parallel, and since the lamp string circuit is provided with four groups, the filter circuit is also provided with four groups, so as to eliminate the voltage and current ripple of the output of each group of circuits and make the circuit more stable.

[0032] Embodiment one:

[0033] When inputting 220V high voltage, the firewire L and zero line N of input protection circuit 2 are connected to the firewire and zero line of 220V or other power supply, and after the surge absorption of the fuse F1 and adjustable resistor V1 connected to the firewire L, one path supplies voltage conversion detection circuit 4 for full voltage control circuit 5 sampling, and the full voltage controller enters the starting working state, and the other path is rectified by the rectifier bridge BD1 in the bridge rectifier circuit 3 and then is absorbed by the capacitor CV1 and the voltage stabilizing diode Z1 after secondary surge absorption, the positive electrode is divided into three paths, one path provides working voltage for the full voltage control circuit 5 after the power supply resistor R11, and at the same time, it also provides the MOS tube Q1 drain D voltage for the series-parallel conversion circuit 6 to prepare for the execution of the work of the series-parallel conversion circuit 6, and at the same time, the negative electrode of the controller is also connected to the negative electrode of the BD1 rectifier bridge to form a circuit loop, at this time, the full voltage controller starts to work and makes logical judgment, when the controller BUS port detects that the voltage is greater than BUS_L and less than BUS_H, the full voltage controller works in parallel mode, the EN port is opened, and the OUT1 and OUT2 ports are opened; when the controller BUS port detects that the voltage is greater than BUS_H, the full voltage controller works in series mode, the EN port is closed, the OUT2 port is opened, and the OUT1 port is closed. When the high voltage is 140-264V, the full voltage controller is in series mode, the EN port is closed, the OUT2 port is opened, and the OUT1 port is closed, and when the low voltage is about 140V-200V, the circuit boards U3 and U4 of the full balance circuit 7 are turned on, at this time, the two groups of circuits work in parallel, the circuit boards U5 and U6 of the full balance circuit 7 are also turned on at the same time, and the two groups of circuits also work in parallel, the positive electrode of the rectifier bridge DB1 is divided into two branches, branch 1 is connected to the OUT terminal of the circuit board U3 of the full balance circuit 1, the GND terminal of the circuit board U3 is connected to the second lamp string circuit L8-L14, branch 2 is connected to one end of the first lamp string circuit L1-L7, the other end of the first lamp string circuit L1-L7 is connected to the OUT terminal of the circuit board U4 of the full balance circuit 2, the two branches are connected to the OUT terminal of the circuit board U5 of the full balance circuit 3, and also connected to the third lamp string circuit L15-L21, the GND terminal of the circuit board U5 of the full balance circuit 3 is connected to the fourth lamp string circuit L22-L28, the third lamp string circuit L15-L21 is connected to the OUT terminal of the circuit board U6 of the full balance circuit 4, and the circuit board U6 is connected to the OUT2 terminal of the controller, and is connected to the negative electrode of the rectifier bridge BD1 through the full voltage controller.

[0034] With the input voltage rises, the reference potential circuit 8 set A, B, C, D four potential also rises, when the reference potential circuit A, B, C, D four electric rise to more than the maximum reference value of the circuit board of the full balance circuit 1-4 REXT pin, that is, the closing valve value, at this time the full balance circuit 1-4 are not turned on, line circuit loop is: rectifier bridge positive L1-L7-R8 or D8-L8-L14-RS5 or RS6-D4-L15-L21-R9 or D13-RS7 or RS9-L22-L28-RS9 or RS10-OUT2-full voltage controller-BD1 rectifier bridge negative.

[0035] Example two:

[0036] When the input 120V low voltage, the input protection circuit 2 of the fire line L, zero line N is connected to the fire line and zero line of 120V or other power supply, through the connection of the silicon light dimmer 1 on the fire line L fuse F1 and adjustable resistance V1 do surge absorption, then a supply voltage conversion detection circuit 4 for full voltage control circuit 5 sampling, full voltage controller into the starting state, the other way after the bridge rectifier circuit 3 in the rectifier bridge BD1 rectification after the secondary surge absorption by the capacitor CV1 and voltage regulator diode Z1 absorption, the positive electrode is divided into three ways, one way through the power supply resistance R11 for full voltage control circuit 5 to provide working voltage, while also for the series-parallel conversion circuit 6 to provide MOS tube Q1 drain D voltage, for the series-parallel conversion circuit 6 to prepare for work, at the same time the full voltage controller negative also connected to the negative of BD1 rectifier bridge to form a circuit loop, at this time the full voltage controller starts to work, logic judgment, when the controller BUS port detects voltage greater than BUS_L and less than BUS_H, full voltage controller works in parallel mode, EN port open, OUT1 and OUT2 port open; When the controller BUS port detects voltage greater than BUS_H, full voltage controller works in series mode, EN end closed, OUT2 port open, OUT1 port closed.

[0037] When the input voltage is 50-140V, the full voltage controller is in parallel mode, the EN port is open, the OUT1 and OUT2 ports are open, when the low voltage is about 50V-100V, the circuit boards U3, U4 of the 1st and 2nd groups of the full balance circuit 7 are turned on, at this time, the two groups of circuits work in parallel, the circuit boards U5, U6 of the 3rd and 4th groups of the full balance circuit 7 are also turned on at the same time, and the two groups of circuits also work in parallel, the positive electrode of the rectifier bridge DB1 is branched into two branches, branch 1 connects the OUT terminal of the circuit board U3 of the full balance circuit 1, the GND terminal of the circuit board U3 is connected to the second lamp string circuit L8-L14, branch 2 passes through one end of the first lamp string circuit L1-L7, the other end of the first lamp string circuit L1-L7 is connected to the OUT terminal of the circuit board U4 of the full balance circuit 2, the circuit board U4 is connected to the OUT1 terminal of the controller, and then connected to the negative electrode of the rectifier bridge BD1 through the controller, branch 2 is connected to the MOS tube Q1 and the diode D1 of the series-parallel conversion circuit 6 through the positive electrode of the rectifier bridge BD1, and then connected to the OUT terminal of the circuit board U5 of the full balance circuit 3, and also connected to the third lamp string circuit L15-L21, the GND terminal of the circuit board U5 of the full balance circuit 3 is connected to the fourth lamp string circuit L22-L28, the third lamp string circuit L15-L21 is connected to the OUT terminal of the circuit board U6 of the full balance circuit 4, the fourth lamp string circuit L22-L28 is connected to the REXT terminal of the circuit board U6, and the circuit board U6 is connected to the OUT2 terminal of the controller, and then connected to the negative electrode of the rectifier bridge BD1 through the full voltage controller.

[0038] With the increase of the input voltage, the reference potential circuit 8 sets the potential of A, B, C, and D to rise, when the reference potential circuit A, B, C, and D rises to more than the maximum reference value of the REXT pin of the circuit board of the full balance circuit 1-4, that is, the closing valve value, at this time, the full balance circuit 1-4 is not turned on, and the line circuit is: rectifier bridge positive L1-L7-R8 or D8-L8-L14-RS5 or RS6-OUT1-full voltage controller-DB1 rectifier bridge negative; the other way is rectifier bridge positive L15-L21-RS7 or RS9-L22-L28-RS9 or RS10-OUT2-full voltage controller-BD1 rectifier bridge negative.

[0039] The application discloses a linear thyristor dimming full-voltage constant-power input circuit, which can realize the parallel connection of lamp strings under low voltage (such as 127Vac) and the series connection of lamp strings under high voltage (such as 220Vac), so that the system input power is consistent under low voltage and high voltage input; the full-voltage controller can set the system output current under low voltage and high voltage input through peripheral resistors REXT1 and REXT2, has a built-in constant-power function, and can basically keep the input power unchanged when the input voltage fluctuates, so as to prevent the chip temperature from being too high, improve the system application reliability, realize the thyristor dimming function, and be compatible with various brands of dimmers on the market, and the dimming is smooth and has no flicker.

[0040] The above-mentioned embodiments only express the implementation of the present application, and the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A linear thyristor dimming full voltage constant power input circuit, characterized by, The application relates to a full-pressure control circuit, which comprises a thyristor dimmer, an input protection circuit, a bridge rectifier circuit, a voltage conversion detection circuit, a full-pressure control circuit, a series-parallel conversion circuit, a full-balance circuit, a reference bit circuit, a lamp string circuit, a filter circuit and an isolation circuit, wherein the thyristor dimmer is connected at the front end of the input protection circuit, the bridge rectifier circuit is connected at the rear end of the input protection circuit, the output end of the input protection circuit is connected with the voltage conversion detection circuit, the voltage conversion detection circuit is connected with the full-pressure control circuit, the output end of the bridge rectifier circuit is connected with a power supply resistor R11, the other end of the power supply resistor R11 is connected with the full-pressure control circuit, the series-parallel conversion circuit is connected with the full-pressure control circuit, the isolation circuit is connected with the series-parallel conversion circuit, the full-balance circuit, the reference bit circuit, the lamp string circuit and the filter circuit are respectively provided with four groups, and the full-balance circuit, the reference bit circuit and the lamp string circuit are correspondingly connected, the filter circuit is connected in parallel at the two ends of the lamp string circuit, and the isolation circuit is connected between the full-balance circuit and the reference bit circuit. The voltage conversion detection circuit is provided with a resistor R1, a resistor R2 and a capacitor C3, the resistor R1 is connected with the input protection circuit, the resistor R2 is connected in series at the rear end of the resistor R1, the capacitor C3 is connected in parallel at the two ends of the resistor R2, and the capacitor C3 is connected with the full-pressure control circuit. The full-pressure control circuit is provided with a controller U1 and a controller U2 connected in parallel, the rear end of the power supply resistor R11 is respectively connected with the VIN terminal of the controller U1 and the controller U2, the RXT1 terminal of the controller U1 and the controller U2 is respectively connected with a high-voltage current setting resistor R3 and a high-voltage current setting resistor R6, the RXT2 terminal of the controller U1 and the controller U2 is respectively connected with a low-voltage current setting resistor R4 and a low-voltage current setting resistor R7, the other end of the high-voltage current setting resistor R3, the high-voltage current setting resistor R6, the low-voltage current setting resistor R4 and the low-voltage current setting resistor R7 is connected with the capacitor C3, and the capacitor C3 is also connected with the BUS terminal of the controller U1 and the controller U2. The series-parallel conversion circuit is provided with a MOS tube Q1 and a voltage stabilizing diode ZD7, the source of the MOS tube is connected with the bridge rectifier circuit, the gate of the MOS tube is connected with a resistor R12, the other end of the resistor R12 is connected with the resistor R11, one end of the voltage stabilizing diode ZD7 is connected with the drain of the MOS tube, the other end of the voltage stabilizing diode ZD7 is connected with the gate of the MOS tube, and the gate of the MOS tube is also connected with the EN terminal of the controller U1. The full balance circuit is provided with circuit boards U3, U4, U5, U6, the reference bit circuit is provided with resistors RS3, RS4 and voltage stabilizing diodes ZD3 in parallel, resistors RS5, RS6 and voltage stabilizing diodes ZD4 in parallel, resistors RS7, RS8 and voltage stabilizing diodes ZD5 in parallel, resistors RS9, RS10 and voltage stabilizing diodes ZD6 in parallel, the lamp string circuit is provided with first, second, third and fourth lamp string circuits, and the OUT terminal of the circuit board U3 is connected to the rear end of the bridge rectifier circuit, at the same time, the OUT terminal of the circuit board U3 is connected to one end of the first lamp string circuit, the other end of the first lamp string circuit is connected to the OUT terminal of the circuit board U4, the two ends of the resistors RS3, RS4 and voltage stabilizing diodes ZD3 are respectively connected to the REXT and GND terminals of the circuit board U3, and one end of the resistors RS3, RS4 and voltage stabilizing diodes ZD3 is further connected to resistors R8 and diodes D1 in parallel, the other end of the resistors R8 and diodes D1 is connected to the OUT terminal of the circuit board U4, one end of the second lamp string circuit is connected to the GND terminal of the circuit board U3, the other end of the second lamp string circuit is connected to the REXT terminal of the circuit board U4, the two ends of the resistors RS5, RS6 and voltage stabilizing diodes ZD4 are respectively connected to the REXT and GND terminals of the circuit board U4, one end of the resistors RS5, RS6 and voltage stabilizing diodes ZD4 is connected to an isolation circuit, the other end of the isolation circuit is connected to the OUT terminal of the circuit board U5, the two ends of the fourth lamp string circuit are respectively connected to the OUT terminals of the circuit boards U5, U6, the two ends of the resistors RS7, RS8 and voltage stabilizing diodes ZD5 are respectively connected to the REXT and GND terminals of the circuit board U5, and one end of the resistors RS7, RS8 and voltage stabilizing diodes ZD5 is further connected to resistors R9 and diodes D3 in parallel, the other end of the resistors R9 and diodes D3 is connected to the OUT terminal of the circuit board U6, one end of the fourth lamp string circuit is connected to the GND terminal of the circuit board U5, the other end of the fourth lamp string circuit is connected to the REXT terminal of the circuit board U6, the two ends of the resistors RS9, RS10 and voltage stabilizing diodes ZD6 are respectively connected to the REXT and GND terminals of the circuit board U6, and one end of the resistors RS9, RS10 and voltage stabilizing diodes ZD6 is connected to the OUT2 terminal of the controller U2.

2. A linear SCR dimming full voltage constant power input circuit according to claim 1, wherein, The input protection circuit is provided with a firewire L and a zero line N for external power supply, a silicon controlled dimmer is connected in series on the firewire L, a fuse F1 is connected to the rear end of the silicon controlled dimmer, and an adjustable resistor is connected between the firewire L and the zero line N.

3. A linear SCR dimming all-voltage constant power input circuit according to claim 2, wherein The bridge rectifier circuit is provided with a rectifier bridge BD1, a transient diode RTVS, a capacitor CV1 and a voltage stabilizing diode Z1, the front end of the rectifier bridge BD1 is connected with a live wire L and a neutral wire N, the capacitor CV1 is connected across the back end of the rectifier bridge BD1, the transient diode RTVS is connected in series between the rectifier bridge BD1 and the capacitor CV1, and the voltage stabilizing diode Z1 is connected in parallel at the back end of the capacitor CV1.

4. A linear SCR dimming all-voltage constant power input circuit according to claim 1, wherein The lamp string circuit is provided with a plurality of serially connected LED lamp beads, and four LED lamp beads are provided as 1800K-7500K arbitrary section color temperature lamp beads.

5. A linear SCR dimming all-voltage constant power input circuit according to claim 1, wherein The filter circuit is provided with a parallel resistance RD and a capacitor CP.

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