CN102026447A - Constant current driving method of fluorescent lamp and its driving circuit - Google Patents

Abstract

The invention discloses a constant current driving method of a fluorescent lamp, which comprises the following steps: 1) an alternating current input end is arranged and used for inputting an alternating current driving power supply to realize the access of alternating current; 2) a direct current output end is arranged and used for outputting a direct current driving power supply to drive the fluorescent lamp; 3) a constant current drive control circuit is arranged, one end of the constant current drive control circuit is connected with the alternating current input end, the other end of the constant current drive control circuit is connected with the direct current output end, and the constant current drive control circuit is used for converting an accessed alternating current drive power supply into a direct current drive power supply and outputting the direct current drive power supply with constant current voltage so as to realize the action of driving the fluorescent lamp by constant current; it also discloses a driving circuit for implementing the method; the method provided by the invention can improve the utilization efficiency of electric energy, ensure the stability of the current and voltage of the driving power supply, and has low manufacturing cost and high safety performance; the driving circuit provided by the invention has the advantages of reasonable layout, small volume, high conversion efficiency, stable current and voltage output and obvious energy-saving effect.

Description

Constant current driving method of fluorescent lamp and its driving circuit

technical field

The invention belongs to the field of drive circuits, and in particular relates to a fluorescent lamp constant current drive method and a drive circuit thereof.

Background technique

LED lamp is a new type of solid light source with energy saving, environmental protection, small size and long life. In recent years, it has been continuously promoted and applied to the field of daily lighting. Because LED lights have the advantages of low power consumption, low temperature, no harmful metals such as mercury and lead, and long working life, it is an inevitable trend to use LED lights as lighting sources in the future. .

Due to the working characteristics of the LED itself, it is determined that it cannot use the same driving power as ordinary incandescent lamps. Some existing LED lamp groups are limited by the unstable current and voltage of the driving power, resulting in the lifespan and luminous efficiency of LED lamps. It is very ideal; at the same time, based on the layout of traditional components, the circuit is relatively complex, the volume is too large, the cost is high, and it is susceptible to electromagnetic interference, so that the output power changes, the work is unstable, it is easy to generate heat, and radiation produces a lot of loss. The efficiency is low, and the overall energy-saving effect is not very obvious.

Contents of the invention

In view of the above shortcomings, one of the purposes of the present invention is to provide a constant current driving method for fluorescent lamps that can not only improve the efficiency of electric energy utilization, but also ensure the stability of the current and voltage of the driving power supply, and has low manufacturing cost and high safety performance;

The purpose of the present invention is also to provide a drive circuit with reasonable layout, small size, high conversion efficiency, stable current and voltage output, and obvious energy-saving effect.

To achieve the above object, the technical solution provided by the present invention is:

A kind of fluorescent lamp constant current driving method, it comprises the following steps:

(1) Set up an AC input terminal, which is used to input the AC drive power supply to realize access to AC power;

(2) A DC output terminal is provided for outputting a DC drive power supply to drive fluorescent lamps;

(3) A constant current drive control circuit is provided, one end of which is connected to the AC input terminal, and the other end is connected to the DC output terminal, which is used to convert the connected AC drive power supply into a DC drive power supply, and with a constant Current and voltage output to realize the action of driving fluorescent lamps with constant current.

It also includes the steps of:

(4) A strip-shaped circuit board is arranged, which is formed by stacking a placement layer, an upper wiring layer, and a lower wiring layer in sequence, and the AC input terminal and the DC output terminal are symmetrically arranged at both ends of the circuit board , the components of the constant current drive control circuit are all arranged on the placement layer of the circuit board, and are parallel to each other and arranged in sequence along the long side direction of the circuit board.

Described step (3), it specifically comprises the following steps:

(31) A protection and lightning protection circuit is provided, which includes a protection unit and a lightning protection unit;

(32) An EMI filter circuit is set to filter out other frequency interference clutter that does not meet the frequency of the preset required AC drive power supply;

(33) A rectification circuit is set, which is used to convert the AC drive power processed by the EMI filter circuit into a DC drive power;

(34) A power factor correction circuit is set to correct and compensate the above-mentioned DC drive power supply to improve its power factor, and the power factor correction circuit includes a valley filling circuit unit and a resistance unit;

(35) A filter circuit is provided for performing adaptive charge and discharge actions on the DC drive power processed by the power factor correction circuit according to the current and voltage of the preset required DC drive power, so that the DC drive The current and voltage of the power supply are stable;

(36) A power conversion circuit is set, which includes an integrated control circuit, a grid discharge circuit with a band, a switch circuit and an energy storage circuit;

(37) The protection and lightning protection circuit, EMI filter circuit, rectifier circuit, power factor correction circuit, filter circuit, and power conversion circuit are laid out independently, and are set at corresponding high-frequency, Intermediate frequency and low frequency areas; the protection and lightning protection circuit, EMI filter circuit, rectifier circuit, power factor correction circuit, filter circuit, and power conversion circuit are sequentially connected to form a constant current drive control circuit;

The steps (31) to (36) are in no sequence.

A driving circuit of the above-mentioned constant current driving method for fluorescent lamps, which includes a circuit board and an AC input terminal and a DC output terminal arranged on the circuit board, and also includes a constant current drive control device arranged on the circuit board circuit, the AC input terminal is connected to the DC output terminal through the constant current drive control circuit, and the constant current drive control circuit includes a protection and lightning protection circuit, an EMI filter circuit, a rectification circuit, and a power factor correction circuit connected in sequence circuit, filter circuit and power conversion circuit.

The circuit board is in the shape of a strip, which is formed by stacking a placement layer, an upper wiring layer, and a lower wiring layer in sequence. The AC input terminal and the DC output terminal are symmetrically arranged at both ends of the circuit board. The components of the constant current drive control circuit are all arranged on the laying layer of the circuit board, and are parallel to each other and arranged in sequence along the long side direction of the circuit board.

The protection and lightning protection circuit is composed of a protection unit and a lightning protection unit, the lightning protection unit is a varistor Vz1, which is connected in series on the AC input end; the protection unit fuse is a fuse F1, It is connected in parallel to the AC input.

The EMI filter circuit includes a safety capacitor CX1, a safety capacitor CX2, an inductor LD1, an inductor LD1, an inductor LD2 and a resistor RD1, and the safety capacitor CX1 passes through the inductor LD1, the resistor RD1, the inductor LD2 and the safety capacitor respectively. Capacitor CX2 is connected.

The rectification circuit includes a bridge rectifier Db1, and the filter circuit includes an electrolytic capacitor C1.

The power factor correction circuit includes a valley filling circuit unit and a resistance unit, the resistance unit includes resistors R1-R3, the valley filling circuit unit includes diodes D1-D2, diode D4, electrolytic capacitor Ce1 and electrolytic capacitor Ce2, the The electrolytic capacitor Ce1 is connected in parallel with the resistor R1, one end thereof is connected with the diode D2 and the diode D1 respectively, and the other end is connected with the diode D4, the resistor R3 is connected in parallel with the electrolytic capacitor Ce2, and one end thereof is connected with the diode D2, The other end is respectively connected to the diode D4 and the resistor R2, and the resistor R2 is connected to the diode D1.

The power conversion circuit includes an integrated control circuit, a grid discharge circuit, a switch circuit and an energy storage circuit. The integrated control circuit includes a constant current control chip U1, a voltage regulator tube Dz1, resistors R4-R6, Resistor R8, resistor Rt1, detection resistors Rs1-Rs2 and capacitors C2-C4; the discharge circuit with gate includes a diode D5 and a resistor R7; the switch circuit includes a MOS switch tube Q1; the energy storage circuit It includes high-frequency transformers LM1-LM2, inductor LE1, diode D3, capacitors C5-C6 and capacitor Co1.

The beneficial effects of the present invention are: the method provided by the present invention can not only improve the utilization efficiency of electric energy, but also ensure the stability of the current and voltage of the driving power supply, and has low manufacturing cost and high safety performance; the layout of the driving circuit provided by the present invention is reasonable, Small size, high conversion efficiency, stable current and voltage output, and obvious energy-saving effect.

The EMI filter circuit adopts a symmetrical layout, and the filter stage and the power stage are symmetrically arranged on both sides of the output stage, so that the output stage and the power stage are far away from the filter stage, which reduces the coupling of the filter stage and avoids the output stage and power stage. The stages are in close proximity, causing noise to couple directly to the grid. At the same time, the wiring of the safety capacitor CX1 and the safety capacitor CX2 of the EMI filter level should be as short as possible to reduce the ESL and improve the electromagnetic compatibility.

The protection and lightning protection circuit includes a protection unit and a lightning protection unit, the protection unit is a fuse F1, the fuse F1 is used to detect the operating current of the power supply, and will automatically blow the fuse F1 when reaching or exceeding the rated current of the fuse F1, Play the role of protecting the circuit; the lightning protection unit is a piezoresistor Vz1, when the lightning high voltage enters the circuit, the circuit resistance of the piezoresistor Vz1 becomes smaller, forming a lightning high voltage circuit, thereby protecting the power supply circuit behind;

The EMI filter circuit utilizes the characteristics of inductance and capacitance, so that the alternating current with a frequency of about 50Hz/60Hz can pass through the filter smoothly, and the interference clutter of other frequencies is filtered out, thereby filtering out the high-frequency pulse of the external power grid to the power supply. interference, and at the same time reduce the electromagnetic interference of the power supply itself to the outside world;

The rectifier circuit adopts bridge rectification, and converts the input AC drive power into a DC drive power through the unidirectional conductivity of the internal diode of the bridge rectifier bridge pile Db1;

The power factor correction circuit includes a valley filling circuit unit and a resistance unit, the valley filling circuit is a passive power factor correction circuit, and the valley filling circuit behind the rectifier bridge is used to greatly increase the conduction angle of the rectifier tube , By filling the valley point, the input current changes from a peak pulse to a waveform close to a sine wave, thereby improving the power factor and significantly reducing the total harmonic distortion. Compared with the traditional inductive passive power factor correction circuit, the circuit is simple, the power factor compensation effect is remarkable, and there is no need to use a large inductor with a large volume and a heavy weight in the input circuit; the resistance unit is added, the The resistance unit includes resistors R1~R3, which can further improve the power factor, and the effect is obvious;

The filter circuit adopts an electrolytic capacitor C1, and uses the charging and discharging function of the electrolytic capacitor C1 to charge it when the voltage is high and discharge it when the voltage is low, so as to obtain a DC drive power supply with a relatively stable current and voltage;

The integrated control circuit uses a constant current control chip U1, resistors R4~R6, resistor R8, a voltage regulator tube Dz1, and a capacitor C3 to form a power supply circuit for the control chip. The detection resistors Rs1~Rs2 are output current detection resistors to detect the output peak current. The fourth pin of the constant current control chip U1 is the drain of the internal power switch of the chip, which is used to control the on-off of the external switching circuit. The constant current control chip U1 works in a continuous current mode step-down system. The detected output peak current is used to control the pulse width of the PWM pulse output by pin 4, so as to control the conduction time of the external MOS switch Q1, thereby stabilizing the output current. The switch circuit plays the role of high-frequency on-off of the output circuit.

A gate discharge circuit is added to discharge the parasitic stored in the gate parasitic capacitance of the MOS switch tube Q1.

charge to prevent the MOS switch Q1 from being turned on incorrectly due to parasitic charges.

An energy storage circuit is added. When the MOS switch tube Q1 is turned on, the main circuit is turned on through LM1 and LM2. LM1 and LM2 store energy and provide energy to the load. When the MOS switch tube is turned off, the high-frequency transformer LM1~LM2 The stored energy forms a loop through the inductor LE1 and the diode D1. The high-frequency transformers LM1~LM2 release energy to provide energy to the load. The main control chip controls the high-frequency transformers LM1~LM2 to store energy by controlling the conduction time of the MOS switch tube Q1. And the time to release energy, so as to achieve the stability of the output. The high-frequency transformers LM1-LM2 are EPC13 high-frequency transformers, which replace the traditional inductance of the original design, so that the inductance of the finished circuit will not be affected after the finished circuit is installed in the aluminum-plastic tube, thereby effectively stabilizing the output power.

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Description of drawings

Fig. 1 is a schematic diagram of the circuit principle of the present invention.

Detailed ways

Embodiment: Referring to FIG. 1, this embodiment provides a constant current driving method for fluorescent lamps, which includes the following steps:

(1) Set up an AC input terminal, which is used to input the AC drive power supply to realize access to AC power;

(2) A DC output terminal is provided for outputting a DC drive power supply to drive fluorescent lamps;

(3) A constant current drive control circuit is provided, one end of which is connected to the AC input terminal, and the other end is connected to the DC output terminal, which is used to convert the connected AC drive power supply into a DC drive power supply, and with a constant Current and voltage output, in order to realize the action of driving the eye light with constant current.

(4) A strip-shaped circuit board is arranged, which is formed by stacking a placement layer, an upper wiring layer, and a lower wiring layer in sequence, and the AC input terminal and the DC output terminal are symmetrically arranged at both ends of the circuit board , the components of the constant current drive control circuit are all arranged on the placement layer of the circuit board, and are parallel to each other and arranged in sequence along the long side direction of the circuit board.

Described step (3), it specifically comprises the following steps:

(31) A protection and lightning protection circuit is provided, which includes a protection unit and a lightning protection unit;

(32) An EMI filter circuit is set to filter out other frequency interference clutter that does not meet the frequency of the preset required AC drive power supply;

(33) A rectification circuit is set, which is used to convert the AC drive power processed by the EMI filter circuit into a DC drive power;

(34) A power factor correction circuit is set to correct and compensate the above-mentioned DC drive power supply to improve its power factor, and the power factor correction circuit includes a valley filling circuit unit and a resistance unit;

(35) A filter circuit is provided for performing adaptive charge and discharge actions on the DC drive power processed by the power factor correction circuit according to the current and voltage of the preset required DC drive power, so that the DC drive The current and voltage of the power supply are stable;

(36) A power conversion circuit is set, which includes an integrated control circuit, a grid discharge circuit with a band, a switch circuit and an energy storage circuit;

(37) The protection and lightning protection circuit, EMI filter circuit, rectifier circuit, power factor correction circuit, filter circuit, and power conversion circuit are laid out independently, and are set at corresponding high-frequency, Intermediate frequency and low frequency areas; the protection and lightning protection circuit, EMI filter circuit, rectifier circuit, power factor correction circuit, filter circuit, and power conversion circuit are sequentially connected to form a constant current drive control circuit;

The steps (31) to (36) are in no sequence.

A driving circuit for implementing the above-mentioned constant current driving method for fluorescent lamps, which includes a circuit board and an AC input terminal and a DC output terminal arranged on the circuit board, and also includes a constant current drive circuit board arranged on the circuit board A control circuit, the AC input terminal is connected to the DC output terminal through the constant current drive control circuit, and the constant current drive control circuit includes a protection and lightning protection circuit, an EMI filter circuit, a rectification circuit, and a power factor Correction circuit, filter circuit and power conversion circuit.

The circuit board is in the shape of a strip, which is formed by stacking a placement layer, an upper wiring layer, and a lower wiring layer in sequence. The AC input terminal and the DC output terminal are symmetrically arranged at both ends of the circuit board. The components of the constant current drive control circuit are all arranged on the laying layer of the circuit board, and are parallel to each other and arranged in sequence along the long side direction of the circuit board.

The protection and lightning protection circuit is composed of a protection unit and a lightning protection unit, the lightning protection unit is a varistor Vz1, which is connected in series on the AC input end; the protection unit fuse is a fuse F1, It is connected in parallel to the AC input.

The EMI filter circuit includes a safety capacitor CX1, a safety capacitor CX2, an inductor LD1, an inductor LD1, an inductor LD2 and a resistor RD1, and the safety capacitor CX1 passes through the inductor LD1, the resistor RD1, the inductor LD2 and the safety capacitor respectively. Capacitor CX2 is connected.

The rectification circuit includes a bridge rectifier Db1, and the filter circuit includes an electrolytic capacitor C1.

The power factor correction circuit includes a valley filling circuit unit and a resistance unit, the resistance unit includes resistors R1-R3, the valley filling circuit unit includes diodes D1-D2, diode D4, electrolytic capacitor Ce1 and electrolytic capacitor Ce2, the The electrolytic capacitor Ce1 is connected in parallel with the resistor R1, one end thereof is connected with the diode D2 and the diode D1 respectively, and the other end is connected with the diode D4, the resistor R3 is connected in parallel with the electrolytic capacitor Ce2, and one end thereof is connected with the diode D2, The other end is respectively connected to the diode D4 and the resistor R2, and the resistor R2 is connected to the diode D1.

The power conversion circuit includes an integrated control circuit, a grid discharge circuit, a switch circuit and an energy storage circuit. The integrated control circuit includes a constant current control chip U1, a voltage regulator tube Dz1, resistors R4-R6, Resistor R8, resistor Rt1, detection resistors Rs1-Rs2 and capacitors C2-C4; the discharge circuit with gate includes a diode D5 and a resistor R7; the switch circuit includes a MOS switch tube Q1; the energy storage circuit It includes high-frequency transformers LM1-LM2, inductor LE1, diode D3, capacitors C5-C6 and capacitor Co1.

The components of the constant current drive control circuit all need to be arranged on the placement layer of the circuit board, and according to the protection and lightning protection circuit, EMI filter circuit, rectifier circuit, power factor correction circuit, filter circuit and power conversion circuit itself The frequency of the circuit is set in the corresponding high frequency, intermediate frequency, and low frequency areas, so that the components between the circuits can form an independent layout, that is, the layout of the high and low frequency circuits is separated, and the interference between different circuits is avoided. The interference between low frequencies improves the stability of work and can pass the EMI test.

The components of the constant current drive control circuit are as parallel as possible to each other and arranged sequentially along the long side of the circuit board, which can further increase the anti-interference ability of the circuit, and at the same time be beautiful and tidy, easy to produce, and reduce production costs.

The EMI filter circuit adopts a symmetrical layout, and the filter stage and the power stage are symmetrically arranged on both sides of the output stage, so that the output stage and the power stage are far away from the filter stage, which reduces the coupling of the filter stage and avoids the output stage and power stage. The stages are in close proximity, causing noise to couple directly to the grid. At the same time, the wiring of the safety capacitor CX1 and the safety capacitor CX2 of the EMI filter level should be as short as possible to reduce the ESL and improve the electromagnetic compatibility.

When working, after connecting to the AC power through the AC input terminal, it first passes through the protection unit and the lightning protection unit in the protection and lightning protection circuit. The protection unit is a fuse F1, which is used to detect the working current of the power supply. When it reaches or exceeds When the rated current of the fuse F1 is set, the fuse F1 will be blown automatically to protect the circuit; the lightning protection unit is a piezoresistor Vz1, when a lightning high voltage enters the circuit, the circuit resistance of the piezoresistor Vz1 becomes smaller, forming a lightning high voltage circuit, thereby protecting the power circuit behind;

The AC drive power supply enters the EMI filter circuit after the protection and lightning protection circuit. The EMI filter circuit uses the characteristics of inductance and capacitance, so that the AC with a frequency of about 50Hz/60Hz can pass through the filter smoothly, and the interference clutter of other frequencies is filtered. In order to filter out the interference of the high-frequency pulse of the external power grid on the power supply, and at the same time reduce the electromagnetic interference of the power supply itself to the outside world;

The AC drive power enters the rectification circuit after passing through the EMI filter circuit. The rectification circuit adopts bridge rectification. Through the unidirectional conductivity of the internal diode of the bridge rectifier bridge stack Db1, the input AC drive power is converted into a DC drive power supply;

The DC drive power enters the power factor correction circuit. The power factor correction circuit includes a valley filling circuit unit and a resistance unit. The valley filling circuit is a passive power factor correction circuit. It uses the valley filling circuit behind the rectifier bridge to greatly increase The conduction angle of the rectifier can make the input current change from a peak pulse to a waveform close to a sine wave by filling the valley point, thereby improving the power factor and significantly reducing the total harmonic distortion. Compared with the traditional inductive passive power factor correction circuit, the circuit is simple, the power factor compensation effect is remarkable, and there is no need to use a large inductor with a large volume and weight in the input circuit; a resistance unit is added, and the resistance unit includes Resistors R1~R3 can further improve the power factor, and the effect is obvious;

After being processed by the power factor correction circuit, the DC drive power enters the filter circuit. The filter circuit uses an electrolytic capacitor C1, and uses the charge and discharge function of the electrolytic capacitor C1 to charge it when the voltage is high, and to charge it when the voltage is low. Discharge, so as to obtain a DC drive power supply with a relatively stable current and voltage;

The DC drive power enters the power conversion circuit through the filter circuit. The power conversion circuit adopts BUCK topology, which includes an integrated control circuit, a grid discharge circuit, a switch circuit and an energy storage circuit; the integrated control circuit adopts constant current control Chip U1, resistors R4~R6, resistor R8, voltage regulator tube Dz1, and capacitor C3 form the power supply circuit of the control chip. The detection resistors Rs1~Rs2 are output current detection resistors to detect the output peak current. The constant current control chip U1's first Pin 4 is the drain of the internal power switch of the chip, which is used to control the on-off of the external switching circuit. The constant current control chip U1 works in a continuous current mode step-down system, and the output peak current detected by the current detection resistor, To control the pulse width of the PWM pulse output by pin 4, so as to control the conduction time of the external MOS switch Q1, thereby stabilizing the output current. The switch circuit plays the role of high-frequency on-off of the output circuit.

A gate discharge circuit is added to discharge the parasitic charge stored in the parasitic capacitance of the gate of the MOS switch Q1, so as to prevent the MOS switch Q1 from being misconducted due to the parasitic charge.

An energy storage circuit is added. When the MOS switch tube Q1 is turned on, the main circuit is turned on through LM1 and LM2. LM1 and LM2 store energy and provide energy to the load. When the MOS switch tube is turned off, the high-frequency transformer LM1~LM2 The stored energy forms a loop through the inductor LE1 and the diode D1. The high-frequency transformers LM1~LM2 release energy to provide energy to the load. The main control chip controls the high-frequency transformers LM1~LM2 to store energy by controlling the conduction time of the MOS switch tube Q1. And the time to release energy, so as to achieve the stability of the output. The high-frequency transformers LM1-LM2 are EPC13 high-frequency transformers, which replace the traditional inductance of the original design, so that the inductance of the finished circuit will not be affected after the finished circuit is installed in the aluminum-plastic tube, thereby effectively stabilizing the output power.

As described in the above embodiments of the present invention, other driving methods and driving circuits obtained by adopting the same or similar technical features are within the protection scope of the present invention.

Claims (10)

1. A fluorescent lamp constant current driving method is characterized in that it comprises the following steps: (1) Set up an AC input terminal, which is used to input the AC drive power supply to realize access to AC power; (2) A DC output terminal is provided for outputting a DC drive power supply to drive fluorescent lamps; (3) A constant current drive control circuit is provided, one end of which is connected to the AC input terminal, and the other end is connected to the DC output terminal, which is used to convert the connected AC drive power supply into a DC drive power supply, and with a constant Current and voltage output to realize the action of driving fluorescent lamps with constant current. 2. The fluorescent lamp constant current driving method according to claim 1, further comprising the steps of: (4) A strip-shaped circuit board is arranged, which is formed by stacking a placement layer, an upper wiring layer, and a lower wiring layer in sequence, and the AC input terminal and the DC output terminal are symmetrically arranged at both ends of the circuit board , the components of the constant current drive control circuit are all arranged on the placement layer of the circuit board, and are parallel to each other and arranged in sequence along the long side direction of the circuit board. 3. The fluorescent lamp constant current driving method according to claim 1, characterized in that, described step (3), it specifically comprises the following steps: (31) A protection and lightning protection circuit is provided, which includes a protection unit and a lightning protection unit; (32) An EMI filter circuit is set to filter out other frequency interference clutter that does not meet the frequency of the preset required AC drive power supply; (33) A rectification circuit is set, which is used to convert the AC drive power processed by the EMI filter circuit into a DC drive power; (34) A power factor correction circuit is set to correct and compensate the above-mentioned DC drive power supply to improve its power factor, and the power factor correction circuit includes a valley filling circuit unit and a resistance unit; (35) A filter circuit is provided for performing adaptive charge and discharge actions on the DC drive power processed by the power factor correction circuit according to the current and voltage of the preset required DC drive power, so that the DC drive The current and voltage of the power supply are stable; (36) A power conversion circuit is set, which includes an integrated control circuit, a grid discharge circuit with a band, a switch circuit and an energy storage circuit; (37) The protection and lightning protection circuit, EMI filter circuit, rectifier circuit, power factor correction circuit, filter circuit, and power conversion circuit are laid out independently, and are set at corresponding high-frequency, Intermediate frequency and low frequency areas; the protection and lightning protection circuit, EMI filter circuit, rectifier circuit, power factor correction circuit, filter circuit, and power conversion circuit are sequentially connected to form a constant current drive control circuit; The steps (31) to (36) are in no sequence. 4. A driving circuit for implementing the fluorescent lamp constant current driving method as claimed in claim 1, comprising a circuit board and an AC input terminal and a DC output terminal arranged on the circuit board, characterized in that it also includes a setting The constant current drive control circuit on the circuit board, the AC input terminal is connected to the DC output terminal through the constant current drive control circuit, and the constant current drive control circuit includes protection and lightning protection circuits connected in sequence , EMI filter circuit, rectifier circuit, power factor correction circuit, filter circuit and power conversion circuit. 5. The drive circuit according to claim 4, wherein the circuit board is in the shape of a strip, and it is formed by stacking a placement layer, an upper wiring layer, and a lower wiring layer in sequence, and the AC input terminal and the The DC output ends are arranged symmetrically at both ends of the circuit board, and the components of the constant current drive control circuit are all arranged on the laying layer of the circuit board, parallel to each other, and arranged sequentially along the long side of the circuit board. 6. The drive circuit according to claim 4, wherein the protection and lightning protection circuit is composed of a protection unit and a lightning protection unit, the lightning protection unit is a piezoresistor Vz1 connected in series The AC input terminal; the protection unit fuse is a fuse F1, which is connected in parallel to the AC input terminal. 7. The driving circuit according to claim 4, characterized in that, the EMI filter circuit includes a safety capacitor CX1, a safety capacitor CX2, an inductor LD1, an inductor LD1, an inductor LD2 and a resistor RD1, and the safety capacitor CX1 is connected to the safety capacitor CX2 through the inductor LD1 , the resistor RD1 and the inductor LD2 respectively. 8 . The drive circuit according to claim 4 , wherein the rectification circuit comprises a bridge rectifier Db1 , and the filter circuit comprises an electrolytic capacitor C1 . 9. The driving circuit according to claim 4, wherein the power factor correction circuit comprises a valley filling circuit unit and a resistance unit, the resistance unit comprises resistors R1-R3, and the valley filling circuit unit comprises a diode D1～D2, diode D4, electrolytic capacitor Ce1 and electrolytic capacitor Ce2, the electrolytic capacitor Ce1 and resistor R1 are connected in parallel, one end of which is connected with the diode D2 and diode D1 respectively, and the other end is connected with the diode D4, the resistor R3 is connected in parallel with the electrolytic capacitor Ce2, one end of which is connected to the diode D2, and the other end is respectively connected to the diode D4 and a resistor R2, which is connected to the diode D1. 10. The driving circuit according to claim 4, wherein the power conversion circuit comprises an integrated control circuit, a band gate discharge circuit, a switch circuit and an energy storage circuit, and the integrated control circuit comprises a Constant current control chip U1, voltage regulator tube Dz1, resistors R4-R6, resistor R8, resistor Rt1, detection resistors Rs1-Rs2, and capacitors C2-C4; the grid discharge circuit includes a diode D5 and a resistor R7; The switch circuit includes a MOS switch tube Q1; the energy storage circuit includes high-frequency transformers LM1-LM2, inductor LE1, diode D3, capacitors C5-C6 and capacitor Co1.