CN113811045A - Power supply and light source system - Google Patents

Power supply and light source system Download PDF

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Publication number
CN113811045A
CN113811045A CN202010529214.3A CN202010529214A CN113811045A CN 113811045 A CN113811045 A CN 113811045A CN 202010529214 A CN202010529214 A CN 202010529214A CN 113811045 A CN113811045 A CN 113811045A
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China
Prior art keywords
circuit
power supply
signal
current
light emitting
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Pending
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CN202010529214.3A
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Chinese (zh)
Inventor
黄国生
邹立波
胡飞
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Shenzhen Appotronics Corp Ltd
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Appotronics Corp Ltd
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Application filed by Appotronics Corp Ltd filed Critical Appotronics Corp Ltd
Priority to CN202010529214.3A priority Critical patent/CN113811045A/en
Priority to PCT/CN2021/099501 priority patent/WO2021249510A1/en
Publication of CN113811045A publication Critical patent/CN113811045A/en
Pending legal-status Critical Current

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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
    • H05B45/345—Current stabilisation; Maintaining constant current
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The application discloses a power supply and a light source system, wherein the power supply comprises a control circuit and at least one constant current circuit, the control circuit is used for receiving a current instruction and generating a control signal according to the current instruction; the constant current circuit is connected with the control circuit and comprises a direct current conversion circuit and an amplification circuit which are connected with each other, wherein the direct current conversion circuit is used for receiving a power supply signal and a control signal and converting the power supply signal into a constant current signal according to the control signal; the amplifying circuit is used for converting the power supply signal into a voltage feedback signal and inputting the voltage feedback signal to the control circuit; the control circuit is also used for controlling the direct current conversion circuit after receiving the voltage feedback signal so as to dynamically adjust the magnitude of a current signal output by the direct current conversion circuit; the current value in the current command is the same as the current value of the constant current signal output by the direct current conversion circuit. Through the mode, the output current can be dynamically adjusted, and the control circuit is simplified.

Description

Power supply and light source system
Technical Field
The application relates to the technical field of circuits, in particular to a power supply and a light source system.
Background
With the rapid development of LED (Light Emitting Diode) and laser technology, LEDs and lasers are widely used in many fields, and there are many schemes for driving LEDs or lasers, for example, Local Dimming control of flat panel televisions, because it uses a large number of LED arrays with small current, the current driven by the arrays is small, and is not suitable for application scenarios with large current; for a light source used for a laser projector, the driving current ratio is large, the lasers are connected in series and then driven in the existing driving mode, each laser is inconvenient to adjust independently, and if each laser is provided with one drive, the size and the cost of the drive are high, so that the laser is not suitable for being applied to productization; in addition, the problem that independent adjustment cannot be performed is solved by adopting a multi-channel linear constant current mode, but the analog quantity of each path of current is uniformly adjusted, so that the current is not convenient to adjust respectively, and the usability is not high.
Disclosure of Invention
The application provides a power supply and a light source system, which can dynamically adjust output current and simplify a control circuit.
In order to solve the technical problem, the technical scheme adopted by the application is as follows: providing a power supply, the power supply comprising: the control circuit is used for receiving a current instruction and generating a control signal according to the current instruction, wherein the current instruction comprises at least one current value; the constant current circuit is connected with the control circuit and comprises a direct current conversion circuit and an amplification circuit which are connected with each other, wherein the direct current conversion circuit is used for receiving a power supply signal and a control signal and converting the power supply signal into a constant current signal according to the control signal; the amplifying circuit is used for converting the power supply signal into a voltage feedback signal and inputting the voltage feedback signal to the control circuit; the control circuit is also used for controlling the direct current conversion circuit after receiving the voltage feedback signal so as to dynamically adjust the magnitude of a current signal output by the direct current conversion circuit; the current value in the current command is the same as the current value of the constant current signal output by the direct current conversion circuit.
In order to solve the above technical problem, another technical solution adopted by the present application is: there is provided a light source system comprising: the processing circuit is used for receiving the image signals, processing the image signals to obtain corresponding current values, and generating current instructions according to the current values; the power supply is connected with the processing circuit and used for receiving the current instruction and outputting a constant current value corresponding to the current instruction; the light source is connected with the power supply and used for receiving the current value output by the power supply and emitting light with corresponding brightness; wherein, the power supply is the power supply.
Through the scheme, the beneficial effects of the application are that: the control circuit can judge whether the current value output by the constant current circuit is the same as the corresponding current value in the current instruction or not by receiving the voltage feedback signal, and if not, the control circuit controls the direct current conversion circuit to dynamically adjust the current output by the constant current circuit; when the power supply is applied to a light source system, one constant current circuit can simultaneously control a plurality of constant current circuits, so that the light source is driven by the constant current circuits, the control circuit can be simplified, the integration level of the control circuit is improved, the circuit size is reduced, and the cost is saved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:
FIG. 1 is a schematic diagram of an embodiment of a power supply provided herein;
FIG. 2 is a schematic diagram of another embodiment of a power supply provided herein;
FIG. 3 is a schematic diagram of the driving circuit in the embodiment shown in FIG. 2;
FIG. 4 is a schematic structural diagram of an embodiment of a light source system provided in the present application;
FIG. 5 is a schematic structural diagram of another embodiment of a light source system provided herein;
FIG. 6 is a schematic structural diagram of a light emitting assembly in the embodiment shown in FIG. 5;
fig. 7 is another arrangement diagram of the light source system in the embodiment shown in fig. 5.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a power supply provided in the present application, and a power supply 10 includes: a control circuit 11 and at least one constant current circuit 12.
The control circuit 11 is configured to receive a current command and generate a control signal according to the current command, and specifically, the control circuit 11 may be an MCU (micro controller Unit), and the current command includes at least one current value.
The constant current circuit 12 is connected to the control circuit 11, the constant current circuit 12 includes a dc conversion circuit 121 and an amplification circuit 122 connected to each other, the constant current circuit 12 can output a plurality of constant current values each corresponding to a current value in a current command under the control of the control circuit 11, for example, the power source 10 is connected to one light emitting element, the light emitting assembly comprises a red light source, a green light source and a blue light source, wherein the light source (comprising the red light source, the green light source and the blue light source) can be an LED light source or a laser light source, at least one current value in the current command comprises three current values I1-I3, the control circuit 11 can output a constant current value I1 to the red light source after receiving the current command, then, a constant current value I2 is outputted to the green light source, and finally a constant current value I3 is outputted to the blue light source, so that the light emitting assembly emits light with corresponding brightness.
The dc conversion circuit 121 is configured to receive a power supply signal and a control signal, and convert the power supply signal into a constant current signal according to the control signal; specifically, the current value in the current command is the same as the current value of the constant current signal output by the dc conversion circuit 121, the power supply signal is a dc signal, for example, 12V, and the dc conversion circuit 121 may be a BUCK circuit (step-down converter circuit), and can process the input power supply signal and output a current signal.
The amplifying circuit 122 is configured to convert the power supply signal into a voltage feedback signal, and input the voltage feedback signal to the control circuit 11, and after receiving the voltage feedback signal, the control circuit 11 controls the dc converting circuit 121 to dynamically adjust the magnitude of the current signal output by the dc converting circuit 121.
In this embodiment, the amplifying circuit 122 obtains the voltage feedback signal, and the control circuit 11 can determine whether the current value output by the constant current circuit 12 is the same as the corresponding current value in the current command according to the voltage feedback signal, and if the current value output by the constant current circuit 12 is not the same as the corresponding current value in the current command, the control circuit 11 dynamically adjusts the current output by the constant current circuit 12 by controlling the dc conversion circuit 121, so that the constant current circuit 12 outputs the constant current value that is the same as the corresponding current value in the current command.
Referring to fig. 2, fig. 2 is a schematic structural diagram of another embodiment of the power supply provided in the present application, in which the power supply 10 further includes a fuse 13 and a common mode coil 14, and the constant current circuit 12 further includes: a current detection circuit 123 and a driving circuit 124.
In order to prevent the circuit from short-circuiting due to the overlarge current or voltage, a fuse 13 is arranged, one end of the fuse 13 is used for receiving a power supply signal, the other end of the fuse 13 is connected with the current detection circuit 123, and when the amplitude of the power supply signal is larger than a second preset voltage value, the fuse 13 can prevent the power supply signal from flowing into the direct current conversion circuit 121; specifically, the second preset voltage value is a safe voltage of the dc conversion circuit 121, and when the voltage of the power supply signal is greater than the second preset voltage value, the fuse 13 cuts off a path with the dc conversion circuit 121, so that the power supply signal cannot flow into the dc conversion circuit 121.
The dc conversion circuit 121 includes: the capacitor comprises a storage capacitor C1, an inductor L, a diode D and a first switch tube T1, wherein one end of the storage capacitor C1 is used for receiving a power supply signal transmitted by the fuse 13, the other end of the storage capacitor C1 is connected with one end of the inductor L, the storage capacitor C1 can comprise a plurality of capacitors connected in parallel, and the other end of the inductor L is connected with a first end of the first switch tube T1; one end of the diode D is connected with one end of the storage capacitor C1, and the other end of the diode D is connected with the other end of the inductor L; the second end of the first switch tube T1 is connected to the driving circuit 124, and the third end of the first switch tube T1 is grounded; specifically, the first switch transistor T1 is an N-type Metal Oxide Semiconductor (nmos), and the first end, the second end, and the third end are a drain, a gate, and a source, respectively.
The common mode coil 14 is used for filtering an interference signal, a first end of the common mode coil 14 is connected to the current detection circuit 123, a second end of the common mode coil 14 is connected to the dc conversion circuit 121, specifically, the second end of the common mode coil 14 is connected to the other end of the storage capacitor C1, a third end of the common mode coil 14 serves as a positive electrode LD + of the power supply 10 and outputs a constant current signal, and a fourth end of the common mode coil 14 serves as a negative electrode LD-of the power supply 10.
The current detection circuit 123 is connected to the amplification circuit 122 and the dc conversion circuit 121, and is configured to detect an average current of a signal input to the constant current circuit 12 and a peak current of a signal output from the constant current circuit 12, and can accurately detect the peak current cycle by cycle so as to prevent erroneous detection or erroneous operation; and the grounding resistor is adopted to detect the peak current, so that the anti-interference performance is good, the operational amplifier conversion is not needed, and the response speed is improved. Specifically, as shown in fig. 2, the current detection circuit 123 includes a first resistor R1 and a second resistor R2, one end of the first resistor R1 receives a power supply signal, which is connected to the other end of the fuse 13, the other end of the first resistor R1 is connected to the amplification circuit 122, specifically, to the first end of the common mode coil 14, the first resistor R1 may be connected to the control circuit 11, and by detecting the current flowing into the first resistor R1, average current detection may be implemented; the second resistor R2 is a ground resistor, one end of the second resistor R2 is connected to the dc conversion circuit 121, specifically, the third end of the first switch transistor T1 is connected to the second resistor R2, the other end of the second resistor R2 is grounded, the second resistor R2 can be connected to the control circuit 11, and peak current detection can be achieved by detecting current flowing through the second resistor R2.
The driving circuit 124 is connected to the control circuit 11 and the dc conversion circuit 121, and is configured to provide a driving signal to the dc conversion circuit 121 so as to operate the dc conversion circuit 121; specifically, with reference to fig. 3 and 4, the driving circuit 124 includes a driving chip 1241 and a peripheral circuit, the peripheral circuit is used for supplying power to the driving chip 1241, limiting the magnitude of a signal input to the driving chip 1241 or limiting the magnitude of a signal input to the first switching tube T1, and includes a third resistor R3 to a seventh resistor R7 and a capacitor C2, one end of the third resistor R3 receives a power supply signal, the other end of the third resistor R3 is connected to one end of a capacitor C2 and the power supply terminal VDD of the driving chip 1241, and the other end of the capacitor C2 is grounded; one end of the fourth resistor R4 is connected to the control circuit 11, the other end of the fourth resistor R4 is connected to one end of the fifth resistor R5 and the signal input end Vin of the driving chip 1241, the other end of the fifth resistor R5 is connected to the ground GND of the driving chip 1241 and is grounded, one end of the sixth resistor R6 is connected to the signal output end Vout of the driving chip 1241, the other end of the sixth resistor R6 is connected to one end of the seventh resistor R7 and the second end of the first switch tube T1, and the other end of the seventh resistor R7 is grounded.
The amplifying circuit 122 includes a differential operational amplifying circuit 1221 and an operational amplifying circuit 1222 connected to each other, the differential operational amplifying circuit 1221 is connected to the current detecting circuit 123, and is configured to receive the first differential signal and the second differential signal output by the current detecting circuit 123 and output the differential amplified signal to the operational amplifying circuit 1222; the operational amplifier circuit 1222 amplifies the differential operational amplifier signal, and outputs a voltage feedback signal to the control circuit 11.
The control circuit 11 is further configured to compare the voltage feedback signal with a first preset voltage value after receiving the voltage feedback signal output by the operational amplifier circuit 1222, and output a control signal to the driving circuit 124 according to the comparison result, so as to adjust the duty ratio of the first switch transistor T1.
When the power supply 10 is connected to a load, and the load may be an LED or a laser, specifically, when the driving circuit 124 drives the first switch tube T1 to be turned on, a power supply signal sequentially passes through the first resistor R1 and the common mode coil 14, is input to the load from the third end of the common mode coil 14, flows into the inductor L through the load, and then flows into the ground through the first switch tube T1 and the second resistor R2, so as to complete energy storage, and the load enters a working state; when the first switch transistor T1 is turned off, the inductor L charges the storage capacitor C1 through the diode D, and the load is not operated.
Referring to fig. 4, fig. 4 is a schematic structural diagram of an embodiment of a light source system provided in the present application, the light source system including: a power supply 10, a processing circuit 20 and a light source 30.
The processing circuit 20 is configured to receive an image signal, process the image signal to obtain a corresponding current value, and generate a current instruction according to the current value; specifically, the image signal may be a digital image signal, and the processing circuit 20 may be an FPGA (Field Programmable Gate Array).
Further, the processing circuit 20 is configured to analyze the image signal to obtain a brightness value corresponding to each pixel in the image, convert the brightness value into a current value, and issue a current instruction through a Serial Peripheral Interface (SPI); specifically, for a color image, the luminance value corresponding to each pixel includes a red luminance value, a green luminance value, and a blue luminance value.
The power supply 10 is connected to the processing circuit 20, and is configured to receive a current instruction issued by the processing circuit 20 and output a constant current value corresponding to the current instruction, where the power supply 10 is the power supply 10 in the foregoing embodiment; specifically, the power supply 10 includes at least one control circuit 11 and at least one constant current circuit 12, the control circuit 11 is configured to adjust an output signal after receiving a current instruction and a frame synchronization signal, so that a current value received by the Light source 30 matches a brightness value of an image, the control circuit 11 may be a Digital control chip, the frame synchronization signal may be a signal output by a Digital Light Processing (DLP) chip or a video signal chip, and the Digital control chip rapidly changes the output current value when the frame synchronization signal appears after receiving the current instruction, so as to implement rapid change of currents of three colors, red, green and blue; the amplitude of the current output by each constant current circuit 12 can be dynamically adjusted between 0.5 and 5A, and when the current value of each constant current circuit 12 is rapidly refreshed, the refreshing rate can reach 120 Hz.
The light source 30 is connected to the power source 10, and is configured to receive a current value output by the power source 10 and emit light with a corresponding brightness.
In a specific embodiment, referring to fig. 4 and 5, the light source 30 includes a plurality of light emitting elements 31 arranged in an array, each light emitting element 31 includes a red light emitting element 311, a green light emitting element 312, and a blue light emitting element 313, and the light emitting elements (including the red light emitting element 311, the green light emitting element 312, or the blue light emitting element 313) may be LEDs or lasers; for example, each power supply 10 includes two control circuits 11, each control circuit 11 can control 4 constant current circuits 12, and since each light emitting element 31 includes 3 light emitting elements, each constant current circuit 12 can alternately drive 3 light emitting elements, and thus 24 light emitting elements can be driven to operate.
As shown in fig. 6, the negative electrodes LD of the red light emitting element 311, the green light emitting element 312, and the blue light emitting element 313 are all connected to the negative electrode LD-of the power supply 10, the positive electrodes of the red light emitting element 311, the green light emitting element 312, and the blue light emitting element 313 are respectively connected to the positive electrode LD + of the power supply 10 through the second switching tubes T21-T23, the control ends of the second switching tubes are connected to the control circuit 11, and the control circuit 11 is configured to output an enable signal to the control ends of the second switching tubes, so that the second switching tubes T21-T23 corresponding to the red light emitting element 311, the green light emitting element 312, and the blue light emitting element 313 are alternately turned on, thereby achieving alternate light emission.
Further, the control circuit 11 generates a RED light enable signal RED _ EN, a green light enable signal GRE _ EN, and a blue light enable signal BLU _ EN, respectively, when the RED light enable signal RED _ EN is at a high level, and the green light enable signal GRE _ EN and the blue light enable signal BLU _ EN are at a low level, the second switch tube T21 corresponding to the RED light emitting element 311 is turned on, and the constant current circuit 12 outputs a signal to the RED light emitting element 311 through the second switch tube T21, so that the RED light emitting element 311 emits RED light; when the green enable signal GRE _ EN is at a high level, and the RED enable signal RED _ EN and the blue enable signal BLU _ EN are both at a low level, the second switch tube T22 corresponding to the green light emitting element 312 is turned on, and the constant current circuit 12 sends a signal to the green light emitting element 312 through the second switch tube T22, so that the green light emitting element 312 emits green light; when the blue enable signal BLU _ EN is at a high level and the RED enable signal RED _ EN and the green enable signal GRE _ EN are both at a low level, the second switch tube T23 corresponding to the blue light emitting element 313 is turned on, and the constant current circuit 12 sends a signal to the blue light emitting element 313 through the second switch tube T23, so that the blue light emitting element 313 emits blue light.
In order to avoid the mutual interference between the power supply line (i.e., the power channel) and the output line (i.e., the control channel) of the constant current circuit 12, and to make the control channel and the power channel staggered, as shown in fig. 7, the processing circuit 20 may be disposed at an upper middle position of the circuit board, the processing circuit 20 is respectively in communication with the two control circuits 11, the power supply interface 40 is disposed at a lower middle position of the circuit board, and the power supply interface 40 is used for receiving a power supply signal.
The embodiment provides a scheme suitable for local dimming of a projector, wherein a digital control chip is adopted to control four constant current circuits 12, each constant current circuit 12 can drive a red light emitting element 311, a green light emitting element 312 and a blue light emitting element 313 in a time-sharing manner by combining a frame synchronization signal, the control is accurate, and the local dimming of the projector can be realized after a plurality of circuits are cascaded; because a plurality of constant current circuits 12 can share one digital control chip, the number of the digital control chips can be effectively reduced, the simplification of a control circuit is facilitated, the circuit size can be reduced, and the cost is saved.
The above embodiments are merely examples, and not intended to limit the scope of the present application, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present application, or those directly or indirectly applied to other related arts, are included in the scope of the present application.

Claims (10)

1. A power supply, comprising:
the control circuit is used for receiving a current instruction and generating a control signal according to the current instruction, wherein the current instruction comprises at least one current value;
the constant current circuit is connected with the control circuit and comprises a direct current conversion circuit and an amplification circuit which are connected with each other, and the direct current conversion circuit is used for receiving a power supply signal and the control signal and converting the power supply signal into a constant current signal according to the control signal; the amplifying circuit is used for converting the power supply signal into a voltage feedback signal and inputting the voltage feedback signal to the control circuit;
the control circuit is further used for controlling the direct current conversion circuit after receiving the voltage feedback signal so as to dynamically adjust the magnitude of a current signal output by the direct current conversion circuit;
wherein a current value in the current command is the same as a current value of a constant current signal output by the direct current conversion circuit.
2. The power supply of claim 1, wherein the constant current circuit further comprises:
the current detection circuit is connected with the amplifying circuit and the direct current conversion circuit and is used for detecting the average current of the signals input to the constant current circuit and the peak current of the signals output by the constant current circuit;
and the driving circuit is connected with the control circuit and the direct current conversion circuit and used for providing a driving signal for the direct current conversion circuit so as to enable the direct current conversion circuit to work.
3. The power supply of claim 2,
the amplifying circuit comprises an operational amplifying circuit and a differential operational amplifying circuit which are connected with each other, the differential operational amplifying circuit is connected with the current detecting circuit and is used for receiving a first differential signal and a second differential signal output by the current detecting circuit and outputting a differential amplifying signal to the operational amplifying circuit; the operational amplification circuit is used for amplifying the differential operational amplification signal and outputting the voltage feedback signal to the control circuit.
4. The power supply of claim 3,
the direct current conversion circuit includes: the power supply circuit comprises a storage capacitor, an inductor, a diode and a first switching tube, wherein one end of the storage capacitor is used for receiving the power supply signal, the other end of the storage capacitor is connected with one end of the inductor, and the other end of the inductor is connected with the first end of the first switching tube; one end of the diode is connected with one end of the storage capacitor, and the other end of the diode is connected with the other end of the inductor; the second end of the first switch tube is connected with the driving circuit, and the third end of the first switch tube is grounded.
5. The power supply of claim 4,
the control circuit is further used for comparing the voltage feedback signal with a first preset voltage value after receiving the voltage feedback signal, and outputting a control signal to the driving circuit according to a comparison result so as to adjust the duty ratio of the first switching tube.
6. The power supply of claim 2,
the power supply further comprises a fuse and a common-mode coil, the fuse is used for preventing the power supply signal from flowing into the direct current conversion circuit when the amplitude of the power supply signal is larger than a second preset voltage value, one end of the fuse is used for receiving the power supply signal, and the other end of the fuse is connected with the current detection circuit; the common mode coil is used for filtering interference signals, a first end of the common mode coil is connected with the current detection circuit, a second end of the common mode coil is connected with the direct current conversion circuit, a third end of the common mode coil is used as a positive electrode of the power supply, and a fourth end of the common mode coil is used as a negative electrode of the power supply.
7. The power supply of claim 2,
the current detection circuit comprises a first resistor and a second resistor, one end of the first resistor receives the power supply signal, and the other end of the first resistor is connected with the amplifying circuit; one end of the second resistor is connected with the direct current conversion circuit, and the other end of the second resistor is grounded.
8. A light source system, comprising:
the processing circuit is used for receiving an image signal, processing the image signal to obtain a corresponding current value, and generating a current instruction according to the current value;
the power supply is connected with the processing circuit and used for receiving the current instruction and outputting a constant current value corresponding to the current instruction;
the light source is connected with the power supply and is used for receiving the current value output by the power supply and emitting light with corresponding brightness;
wherein the power supply is the power supply of any one of claims 1-7.
9. The light source system of claim 8,
the processing circuit is used for analyzing the image signal to obtain a brightness value corresponding to each pixel in the image, converting the brightness value into a current value, and issuing the current instruction through a serial peripheral interface;
the power supply comprises at least one control circuit, and the control circuit is used for adjusting an output signal after receiving the current instruction and the frame synchronization signal so as to enable a current value received by the light source to be matched with a brightness value of the image.
10. The light source system of claim 8,
the light source comprises a plurality of light emitting assemblies arranged in an array, each light emitting assembly comprises a red light emitting element, a green light emitting element and a blue light emitting element, the cathodes of the red light emitting element, the green light emitting element and the blue light emitting element are all connected with the cathode of the power supply, the anodes of the red light emitting element, the green light emitting element and the blue light emitting element are respectively connected to the anode of the power supply through a second switching tube, the control end of the second switching tube is connected with the control circuit, and the control circuit is used for outputting an enabling signal to the control end of the second switching tube so that the red light emitting element, the green light emitting element and the blue light emitting element emit light in turn.
CN202010529214.3A 2020-06-11 2020-06-11 Power supply and light source system Pending CN113811045A (en)

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CN202010529214.3A CN113811045A (en) 2020-06-11 2020-06-11 Power supply and light source system
PCT/CN2021/099501 WO2021249510A1 (en) 2020-06-11 2021-06-10 Power source and light source system

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