CN108966416B - Control system of ultraviolet light-emitting diode light source - Google Patents

Control system of ultraviolet light-emitting diode light source Download PDF

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Publication number
CN108966416B
CN108966416B CN201810758295.7A CN201810758295A CN108966416B CN 108966416 B CN108966416 B CN 108966416B CN 201810758295 A CN201810758295 A CN 201810758295A CN 108966416 B CN108966416 B CN 108966416B
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module
light source
electrically connected
current
pwm
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CN108966416A (en
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郭磊
杨逍
佘安明
陈亮亮
王麟芳
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Kunshan Shiyouwei Electronic Technology Co ltd
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Kunshan Shiyouwei Electronic Technology Co ltd
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]

Abstract

The embodiment of the invention discloses a control system of an ultraviolet light-emitting diode light source, which comprises: the device comprises an ultraviolet light emitting diode UVLED light source module, a current acquisition module, a set current output module, a comparison module and a Pulse Width Modulation (PWM) module; the UVLED light source module is used for emitting ultraviolet light; the current acquisition module is electrically connected with the UVLED light source module and is used for acquiring the working current of the UVLED light source; the comparison module is respectively electrically connected with the set current output module and the current acquisition module and is used for outputting the set current and the working current to the comparison module; the comparison module is used for generating a control signal according to the set current and the working current; the comparison module is electrically connected with the PWM module and used for sending the control signal to the PWM module; the PWM module is used for generating a PWM driving signal according to the control signal and driving the UVLED light source through the PWM driving signal. The technical scheme provided by the embodiment of the invention can solve the problem that the light decay period of the UVLED light source is short due to the existing control mode of the UVLED light source.

Description

Control system of ultraviolet light-emitting diode light source
Technical Field
The embodiment of the invention relates to the field of organic light emitting diodes, in particular to a control system of an ultraviolet light emitting diode light source.
Background
An Ultraviolet Light Emitting Diode (UVLED) is one of LED lamps, and emits a single wavelength of invisible Light, and the wavelength is generally below 400 nm. The UVLED light source is set to light spots with different shapes and different irradiance, and the production requirements in the fields of edge sealing, printing and the like are met. The UVLED light source has the advantages of ultra-long service life, stable performance and sterilization effect, and is widely applied to various fields such as printing, industrial curing, anti-counterfeiting, disinfection and sterilization, medical treatment and the like.
The conventional driving mode of the UVLED light source is mostly a constant voltage control mode, and along with the increase of the working time of the UVLED light source, the junction temperature of the UVLED light source is increased, and the junction temperature of the UVLED light source is in a high value for a long time, so that the light decay period of the UVLED light source is shortened. When the plurality of UVLED light sources jointly complete the photoetching or curing process, the illumination intensities of the UVLED light sources with large light attenuation degrees are different from the illumination intensities of the UVLED light sources with small light attenuation degrees, so that the energy distribution of the plurality of UVLED light sources is uneven.
Disclosure of Invention
The invention provides a control system of an ultraviolet light-emitting diode light source, which aims to solve the problem that the light decay period of a UVLED light source is short due to the existing control mode of the UVLED light source.
An embodiment of the present invention provides an organic light emitting display panel, including: the device comprises an ultraviolet light emitting diode UVLED light source module, a current acquisition module, a set current output module, a comparison module and a Pulse Width Modulation (PWM) module;
the UVLED light source module is used for emitting ultraviolet light through a UVLED light source; the current collection module is electrically connected with the UVLED light source module and is used for collecting working current flowing through the UVLED light source;
the comparison module is respectively electrically connected with the set current output module and the current acquisition module and is used for outputting the set current output by the set current output module and the working current output by the current acquisition module to the comparison module; the comparison module is used for comparing the set current with the working current and generating a control signal;
the comparison module is electrically connected with the PWM module and used for sending the control signal to the PWM module; the PWM module is used for generating a PWM driving signal according to the control signal;
the PWM module is electrically connected with the UVLED light source module and is used for driving the UVLED light source through the PWM driving signal.
Optionally, the UVLED light source module is a boost switching circuit.
Optionally, the boost switching circuit includes: the first switch, the first inductor, the first diode and the storage capacitor; the control end of the first switch is electrically connected with the PWM output end of the PWM module and is electrically connected with the ground end through a first voltage dividing resistor; the first end is electrically connected with the ground end; the second end of the first inductor is electrically connected with the first end of the first diode and the positive electrode of the first diode respectively; the second end of the first inductor is electrically connected with the first level output end; the cathode of the first diode is electrically connected with the first end of the storage capacitor and the first end of the UVLED light source respectively; the second end of the storage capacitor is electrically connected with the ground end; and the second end of the UVLED light source is connected with the ground end.
Optionally, the current collecting module includes: a first sampling resistor; the first end of the first sampling resistor is electrically connected with the second end of the UVLED light source and the first input end of the comparison module respectively, and the second end of the first sampling resistor is electrically connected with the ground end and used for converting the collected working current into a voltage signal from a current signal and sending the voltage signal to the comparison module.
Optionally, the control system of the ultraviolet light emitting diode light source further includes: a current detection module; the current detection module comprises a second sampling resistor; the first end of the second sampling resistor is electrically connected with the second end of the first switch, and the second end of the second sampling resistor is connected with the ground end; and the first end of the second sampling resistor is also electrically connected with the current detection end of the PWM module and is used for controlling the peak value of the working current.
Optionally, the PWM module further includes an adjusting capacitor and a second voltage dividing resistor, and is configured to adjust a switching frequency of the first switch; the first end of the adjusting capacitor is connected with a ground end, and the second end of the adjusting capacitor is respectively and electrically connected with the frequency adjusting end of the PWM module and the first end of the second divider resistor; and the second end of the second voltage-dividing resistor is electrically connected with the reference voltage end of the PWM module.
Optionally, the comparing module includes: a comparator; the first input end of the comparator is electrically connected with the output end of the current acquisition module and is used for acquiring the working current acquired by the current acquisition module; the second input end is electrically connected with the output end of the set current output module and is used for acquiring the set current; the output end of the PWM module is electrically connected with the feedback end of the PWM module and used for sending the control signal to the PWM module.
Optionally, the setting current output module includes: a current signal conversion unit and an amplifier; the input end of the current signal conversion unit is electrically connected with the set current output end and is used for converting the set current from a current signal into a voltage signal, and the output end of the current signal conversion unit is electrically connected with the input end of the amplifier and is used for amplifying the set current converted into the voltage signal; the output end of the amplifier is electrically connected with the comparison module and is used for transmitting the amplified set current to the comparison module.
Optionally, the control system of the ultraviolet light emitting diode light source further includes: the voltage acquisition module is electrically connected with the UVLED light source module and is used for acquiring the working voltage of the UVLED light source; the PWM module is electrically connected with the power supply and is used for transmitting the working voltage to the power supply; the PWM module is further used for adjusting the PWM driving signal according to the working voltage.
Optionally, the voltage acquisition module includes: the third sampling resistor, the slide rheostat and the fourth sampling resistor; the first end of the third sampling resistor is electrically connected with the first end of the UVLED light source, and the second end of the third sampling resistor is electrically connected with the first end of the sliding rheostat; the second end of the sliding rheostat is electrically connected with the control end of the sliding rheostat, the feedback end of the PWM module and the first end of the fourth sampling resistor respectively; and the second end of the fourth sampling resistor is connected with the ground end.
The control system of the ultraviolet light-emitting diode light source provided by the embodiment of the invention adopts the feedback circuit formed by the current acquisition module, and forms a constant-current closed-loop control system with the UVLED light source module, the comparison module and the PWM module, compares the actual working current of the UVLED light source module with the set current, and continuously corrects the actual working current of the UVLED light source so as to enable the actual working current to reach the set current value, so that the UVLED light source obtains the constant working current, the light intensity distribution uniformity of the UVLED light source can be greatly improved, the light decay is reduced, the service life of the UVLED light source is prolonged, and the problems that the light decay period of the UVLED light source is shortened and the energy distribution of a plurality of UVLED light sources is not uniform due to the existing control mode.
Drawings
Fig. 1 is a schematic structural diagram of a control system of an ultraviolet light emitting diode according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another control system for an ultraviolet light emitting diode according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
An embodiment of the present invention provides a control system for an ultraviolet light emitting diode light source, and referring to fig. 1, fig. 1 is a schematic structural diagram of the control system for an ultraviolet light emitting diode provided in the embodiment of the present invention, where the control system for an ultraviolet light emitting diode light source includes:
an ultraviolet light emitting diode (UVLED) light source module 11, a current collecting module 12, a set current output module 13, a comparing module 14 and a Pulse Width Modulation (PWM) module 15;
the UVLED light source module 11 is used for emitting ultraviolet light through a UVLED light source; the current collection module 12 is electrically connected with the UVLED light source module 11 and is used for collecting the working current flowing through the UVLED light source;
the comparison module 14 is electrically connected with the setting current output module 13 and the current collection module 12, and is configured to output the setting current output by the setting current output module 13 and the working current output by the current collection module 12 to the comparison module 14; the comparison module 14 is used for comparing the set current with the working current and generating a control signal;
the comparison module 14 is electrically connected with the PWM module 15, and is configured to send a control signal to the PWM module 15; the PWM module 15 is configured to generate a PWM driving signal according to the control signal;
the PWM module 15 is electrically connected to the UVLED light source module 11, and is configured to drive the UVLED light source through a PWM driving signal.
According to the traditional constant voltage driving method of the UVLED light source, the UVLED light source driven by constant voltage generates heat along with the increase of time, and the working current is larger than the rated current of the UVLED light source at certain moment, so that chemical migration occurs inside the UVLED light source chip, and light decay is caused. The embodiment adopts a constant current driving method, firstly, a set current value is determined according to factory data such as rated power and rated current of a UVLED light source and illumination intensity required by a curing process, working current of the UVLED light source is collected constantly, the working current of the UVLED light source is compared with the set current output by a set current output module 13 through a comparison module 14, and the comparison module 14 automatically adjusts a control signal according to a difference value between the set current and actual working current. The PWM module 15 adjusts the pulse width of the PWM driving signal according to the control signal, and increases or decreases the actual working current of the UVLED light source, thereby completing the whole working current adjustment process. Illustratively, when the operating current of the UVLED light source is greater than the set current, the pulse width of the PWM driving signal is narrowed, and the amplitude of the power boost of the UVLED light source module 11 is reduced, so that the operating current of the UVLED light source is reduced; when the working current of the UVLED light source is smaller than the set current, the pulse width of the PWM driving signal is widened, and the amplitude of the power boost of the UVLED light source module 11 is increased, so that the working current of the UVLED light source is increased, and the operation is circulated in such a manner that the working current of the UVLED light source reaches dynamic balance near the set current.
The UVLED light source module 11 is used as a drive circuit of the UVLED light source and drives the UVLED light source to work. The UVLED light source generally includes a plurality of UVLEDs arranged in an array, the UVLEDs arranged in the array are disposed on the substrate, and the array arrangement shape of the UVLEDs can be adjusted according to an area to be cured, for example, if the area to be cured is a rectangle, the UVLEDs are arranged in a rectangle, and if the area to be cured is a circle, the UVLEDs are arranged in a circle. In the using process, a plurality of substrates provided with UVLED light sources can be spliced into a needed curing area, and because the traditional UVLED light source control method causes a short UVLED light source light decay period, the problem of uneven light intensity distribution of the UVLED light sources of different substrates is easily caused, the exposure and curing effects are influenced, the control system of the UVLED light source provided by the embodiment can prolong the light decay period of the UVLED light sources, and the problem of uneven light intensity distribution of the UVLED light sources of different substrates is solved.
The control system of the ultraviolet light-emitting diode light source provided by the embodiment of the invention adopts the feedback circuit formed by the current acquisition module, and forms a constant-current closed-loop control system with the UVLED light source module, the comparison module and the PWM module, compares the actual working current of the UVLED light source module with the set current, and continuously corrects the actual working current of the UVLED light source so as to enable the actual working current to reach the set current value, so that the UVLED light source obtains the constant working current, the light intensity distribution uniformity of the UVLED light source can be greatly improved, the light decay is reduced, the service life of the UVLED light source is prolonged, and the problems that the light decay period of the UVLED light source is shortened and the energy distribution of a plurality of UVLED light sources is not uniform due to the existing control mode.
Alternatively, referring to fig. 2, fig. 2 is a schematic structural diagram of another ultraviolet light emitting diode control system according to an embodiment of the present invention, and the UVLED light source module 11 may be a boost switching circuit. Compared with a step-down switching circuit, the step-up switching circuit adopted by the implementation has certain advantages. For example, when the constant current control circuit fails, the power supply voltage of the boost-type switching circuit may be lower than the rated voltage of the UVLED light source, so that the chip of the UVLED light source is not burned out, while the power supply voltage of the buck-type switching circuit is higher than the rated voltage of the UVLED light source, so that the chip of the UVLED light source is easily burned out. In addition, the boost type switch circuit can also protect personal safety, the output end of the circuit is just the power supply voltage under the condition that the boost type switch circuit is not connected to the UVLED light source, the power supply voltage of the boost type switch circuit is small, and the injury to the human body can be reduced to a certain extent. However, when the step-down switching circuit is not connected to the UVLED light source, if a person accidentally touches the output end of the circuit, the step-down switching circuit is very prone to electric shock due to the fact that the power supply voltage of the step-down switching circuit is too large.
Alternatively, with continued reference to fig. 2, the boost-type switching circuit may comprise: a first switch Q1, a first inductor L1, a first diode D1, and a storage capacitor C1; a control terminal of the first switch Q1 is electrically connected to the PWM output terminal OUT of the PWM module 15, and is electrically connected to the ground terminal GND through the first voltage dividing resistor R1; the first end is electrically connected with a ground end GND; the second end is respectively electrically connected with the first end of the first inductor L1 and the positive electrode of the first diode D1; the second end of the first inductor L1 is electrically connected to the first level output terminal VI; the cathode of the first diode D1 is electrically connected with the first end of the storage capacitor C1 and the first end of the UVLED light source J3 respectively; a second terminal of the storage capacitor C1 is electrically connected to the ground terminal GND; the second end of the UVLED light source J3 is connected with the ground end GND.
Referring to fig. 2, the working process of the boost switching circuit adopted in this embodiment is as follows: when the first switch Q1 is turned on, the current of the boost type switching circuit flows through the first inductor L1, the first inductor L1 linearly increases, and the electric energy is stored in the first inductor L1 in the form of magnetic energy. At this time, the storage capacitor C1 is discharged, and optionally, to enhance the discharging and charging effects, a plurality of storage capacitors C1 may be arranged in parallel, and exemplarily, as shown in fig. 2, two storage capacitors C1 connected in parallel are arranged to enhance the discharging and charging effects. Since the first switch Q1 is turned on, the anode of the first diode D1 is negative, the first diode D1 is turned off in the opposite direction, and the storage capacitor C1 cannot discharge through the first diode D1 and discharges through the UVLED light source J3. When the first switch Q1 is turned off, the magnetic field in the first inductor L1 will change the polarity of the voltage across the first inductor L1 to keep the current direction of the first inductor L1 unchanged. The voltage converted from the magnetic energy in the first inductor L1 and the first level V input by the first level output terminal VIIConnected in series and together supply power to a load, and output voltage VOGreater than the input voltage VITo realize a boosting process when an input voltage VIAnd the sum of the voltages of the first inductor L1 is higher than the output voltage VOAt this time, the storage capacitor C1 is charged.
The control terminal of the first switch Q1 is electrically connected to the PWM output terminal OUT of the PWM module 15 through a current limiting resistor R6, and the value of the current limiting resistor R6 determines the switching speed of the first switch Q1, and generally ranges from several ohms to several hundred ohms.
Optionally, with continued reference to fig. 2, the current collection module 12 may include: a first sampling resistor R3; the first end Vsen of the first sampling resistor R3 is electrically connected to the second end of the UVLED light source J3 and the first input end Vin1 of the comparing module 14, and the second end is electrically connected to the ground end GND, so as to convert the collected working current from a current signal to a voltage signal and transmit the voltage signal to the comparing module 14.
Optionally, the comparing module 14 may include: a comparator; a first input terminal Vin1 of the comparator is electrically connected to an output terminal Vsen of the current collection module 12, and is used for acquiring the working current collected by the current collection module 12; the second input terminal Vin2 is electrically connected to the output terminal of the setting current output module 13, and is used for obtaining the setting current; the output end is electrically connected with the feedback end FB of the PWM module 15 for sending the control signal to the PWM module.
Optionally, the first input terminal Vin1 is a positive input terminal of the comparator, and the second input terminal Vin2 is a negative input terminal of the comparator. The comparator performs a difference processing on the positive input end and the negative output end, generates a corresponding control signal according to the difference value, and outputs the control signal to the feedback end FB of the PWM module 15 through the output end Vout of the comparator.
Alternatively, referring to fig. 2, the setting current output module 13 may include: a current signal conversion unit 131 and an amplifier 132; the input end of the current signal conversion unit 131 is electrically connected to the setting current output end J2, and is configured to convert the setting current from a current signal to a voltage signal; the output end is electrically connected with the amplifier 132 and is used for amplifying the set current converted into the voltage signal; the output end of the amplifier 132 is electrically connected to the comparing module 14, and is used for transmitting the amplified setting current to the comparing module 14. Illustratively, as shown in fig. 2, the output terminal of the amplifier 132 is electrically connected to the second input terminal Vin2 of the comparison module 14.
Optionally, referring to fig. 2, the control system of the uv led light source may further include: a current detection module 16; the current detection module 16 includes a second sampling resistor R2; a first end of the second sampling resistor R2 is electrically connected with a second end of the first switch Q1, and the second end is connected with the ground end GND; the first terminal of the second sampling resistor R2 is also connected to the current detection terminal I of the PWM module 15SAnd the electrical connection is used for controlling the peak value of the working current.
The second sampling resistor R2 converts the current flowing through the first switch Q1 from a current signal to a voltage signal, and the voltage signal is compared with the error amplifier voltage set inside the PWM module 15 to control the UVLED light source module 11, the conditions of overcurrent, short circuit and the like of the circuit can be detected, and the working stability of the UVLED light source module 11 is ensured. The divider resistor R5 and the filter capacitor C3 form a filter circuit for detecting the input current at the I terminalSThe voltage signal of (2) is filtered.
Optionally, the PWM module 15 may further include a regulating capacitor C2 and a second voltage dividing resistor R4, for regulating the switching frequency of the first switch Q1; a first end of the adjusting capacitor C2 is connected to the ground GND, and a second end is electrically connected to the frequency adjusting terminal RT of the PWM module 15 and the first end of the second voltage-dividing resistor R4, respectively; a second terminal of the second voltage-dividing resistor R4 is electrically connected to the reference voltage terminal VREF of the PWM module 15.
The adjusting capacitor C2 and the second voltage-dividing resistor R4 determine the switching frequency of the first switch Q1, and for example, if the resistance value of the second voltage-dividing resistor R4 is 8k Ω, the duty ratio of the PWM driving signal output by the PWM module 15 may reach 95%, and when the adjusting capacitor C2 is 5nF, the operating frequency is 50 kHz.
Referring to fig. 2, the current limiting resistor R7 is connected in parallel with the adjusting capacitor C4 and then connected to the compensation terminal COMP of the PWM module 15, which can improve the gain and frequency characteristics of the error amplifier.
Optionally, with continued reference to fig. 2, the control system of the uv led light source may further include: the voltage acquisition module 17 is electrically connected with the UVLED light source module 11 and is used for acquiring the working voltage of the UVLED light source J3; and is electrically connected with the PWM module 15 for transmitting the operating voltage to the PWM module 15; the PWM module 15 is also used to regulate the PWM driving signal according to the operating voltage.
In the embodiment, the working current of the UVLED light source J3 is detected and feedback-regulated, and meanwhile, the working voltage of the UVLED light source J3 is regulated, so as to further ensure the stability of the operation of the UVLED light source module 11. The control system of the ultraviolet light emitting diode light source of the embodiment is further provided with a voltage acquisition module 17, the output end of the voltage acquisition module 17 is electrically connected with the feedback end FB of the PWM module 15, the control system of the ultraviolet light emitting diode light source of the embodiment adopts a mode of combining current feedback and voltage feedback, a constant current control technology is realized through multiple closed loops, the light source distribution uniformity of the UVLED light source can be greatly improved, the light attenuation is reduced, and the service life of the UVLED light source is prolonged.
Optionally, the voltage collecting module 17 may include: a third sampling resistor R8, a slide rheostat R10 and a fourth sampling resistor R9; a first end of the third sampling resistor R8 is electrically connected with a first end of the UVLED light source J3, and a second end is electrically connected with a first end of the slide rheostat R10; the second end of the sliding rheostat R10 is electrically connected with the control end of the sliding rheostat R10, the feedback end FB of the PWM module 15 and the first end of the fourth sampling resistor R9 respectively; the second end of the fourth sampling resistor R9 is connected to the ground GND.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (7)

1. A control system for an ultraviolet light emitting diode light source, comprising: the device comprises an ultraviolet light emitting diode UVLED light source module, a current acquisition module, a set current output module, a comparison module and a Pulse Width Modulation (PWM) module;
the UVLED light source module is used for emitting ultraviolet light through a UVLED light source; the current collection module is electrically connected with the UVLED light source module and is used for collecting working current flowing through the UVLED light source;
the comparison module is respectively electrically connected with the set current output module and the current acquisition module and is used for outputting the set current output by the set current output module and the working current output by the current acquisition module to the comparison module; the comparison module is used for comparing the set current with the working current and generating a control signal;
the comparison module is electrically connected with the PWM module and used for sending the control signal to the PWM module; the PWM module is used for generating a PWM driving signal according to the control signal;
the PWM module is electrically connected with the UVLED light source module and used for driving the UVLED light source through the PWM driving signal; the UVLED light source module is a boost type switch circuit;
the control system of the ultraviolet light-emitting diode light source further comprises: the voltage acquisition module is electrically connected with the UVLED light source module and is used for acquiring the working voltage of the UVLED light source; the PWM module is electrically connected with the power supply and is used for transmitting the working voltage to the power supply; the PWM module is also used for adjusting the PWM driving signal according to the working voltage; the voltage acquisition module is also connected with the output end of the comparison module;
wherein, voltage acquisition module includes: the third sampling resistor, the slide rheostat and the fourth sampling resistor; the first end of the third sampling resistor is electrically connected with the first end of the UVLED light source, and the second end of the third sampling resistor is electrically connected with the first end of the sliding rheostat; the second end of the sliding rheostat is electrically connected with the control end of the sliding rheostat, the feedback end of the PWM module and the first end of the fourth sampling resistor respectively; and the second end of the fourth sampling resistor is connected with the ground end.
2. The control system of claim 1, wherein the boost switching circuit comprises: the first switch, the first inductor, the first diode and the storage capacitor;
the control end of the first switch is electrically connected with the PWM output end of the PWM module and is electrically connected with the ground end through a first voltage dividing resistor; the first end is electrically connected with the ground end; the second end of the first inductor is electrically connected with the first end of the first diode and the positive electrode of the first diode respectively;
the second end of the first inductor is electrically connected with the first level output end; the cathode of the first diode is electrically connected with the first end of the storage capacitor and the first end of the UVLED light source respectively;
the second end of the storage capacitor is electrically connected with the ground end; and the second end of the UVLED light source is connected with the ground end.
3. The control system of the uv led light source as claimed in claim 2, wherein the current collection module comprises: a first sampling resistor;
the first end of the first sampling resistor is electrically connected with the second end of the UVLED light source and the first input end of the comparison module respectively, and the second end of the first sampling resistor is electrically connected with the ground end and used for converting the collected working current into a voltage signal from a current signal and sending the voltage signal to the comparison module.
4. The control system of an ultraviolet light emitting diode light source as set forth in claim 2, further comprising: a current detection module; the current detection module comprises a second sampling resistor;
the first end of the second sampling resistor is electrically connected with the second end of the first switch, and the second end of the second sampling resistor is connected with the ground end; and the first end of the second sampling resistor is also electrically connected with the current detection end of the PWM module and is used for controlling the peak value of the working current.
5. The control system of the uv led light source according to any one of claims 2 to 4, wherein: the PWM module further comprises an adjusting capacitor and a second voltage-dividing resistor, and the adjusting capacitor and the second voltage-dividing resistor are used for adjusting the switching frequency of the first switch;
the first end of the adjusting capacitor is connected with a ground end, and the second end of the adjusting capacitor is respectively and electrically connected with the frequency adjusting end of the PWM module and the first end of the second divider resistor; and the second end of the second voltage-dividing resistor is electrically connected with the reference voltage end of the PWM module.
6. The control system of the uv led light source as claimed in claim 1, wherein the comparing module comprises: a comparator;
the first input end of the comparator is electrically connected with the output end of the current acquisition module and is used for acquiring the working current acquired by the current acquisition module; the second input end is electrically connected with the output end of the set current output module and is used for acquiring the set current; the output end of the PWM module is electrically connected with the feedback end of the PWM module and used for sending the control signal to the PWM module.
7. The control system of claim 1, wherein the set current output module comprises: a current signal conversion unit and an amplifier;
the input end of the current signal conversion unit is electrically connected with the set current output end and is used for converting the set current from a current signal into a voltage signal, and the output end of the current signal conversion unit is electrically connected with the input end of the amplifier and is used for amplifying the set current converted into the voltage signal; the output end of the amplifier is electrically connected with the comparison module and is used for transmitting the amplified set current to the comparison module.
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