CN115426740A - Voltage and current adjustable light source driving circuit - Google Patents

Voltage and current adjustable light source driving circuit Download PDF

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Publication number
CN115426740A
CN115426740A CN202210960713.7A CN202210960713A CN115426740A CN 115426740 A CN115426740 A CN 115426740A CN 202210960713 A CN202210960713 A CN 202210960713A CN 115426740 A CN115426740 A CN 115426740A
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China
Prior art keywords
voltage
operational amplifier
circuit
current
light source
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CN202210960713.7A
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Chinese (zh)
Inventor
李富银
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JIAXING JINGYAN INTELLIGENT EQUIPMENT TECHNOLOGY CO LTD
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JIAXING JINGYAN INTELLIGENT EQUIPMENT TECHNOLOGY CO LTD
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Priority to CN202210960713.7A priority Critical patent/CN115426740A/en
Publication of CN115426740A publication Critical patent/CN115426740A/en
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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
    • 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
    • H05B45/34—Voltage stabilisation; Maintaining constant voltage
    • 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
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/17—Operational modes, e.g. switching from manual to automatic mode or prohibiting specific operations

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  • Control Of Voltage And Current In General (AREA)

Abstract

The invention relates to the technical field of electronic circuits, and discloses a voltage and current adjustable light source driving circuit which comprises a controller, a DAC (digital-to-analog converter), a front-end operational amplifier and a multiplex switch, wherein the controller, the DAC, the front-end operational amplifier and the multiplex switch are connected through a circuit, the multiplex switch is a follower circuit formed by multiplex operational amplification and is respectively connected with a voltage adjusting circuit and a current adjusting circuit, and the voltage adjusting circuit outputs adjusting voltage through a switching regulator BUCK circuit; the current regulating circuit sets output current through the precise operational amplifier circuit, then sends the set output current to the high-speed operational amplifier circuit and the MOS tube, and outputs regulated voltage through the sampling resistor. The invention completes the switching of the working modes of constant voltage or constant current by voltage setting and current setting so as to match with various working condition requirements.

Description

Voltage and current adjustable light source driving circuit
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a light source driving circuit with adjustable voltage and current.
Background
Due to the widespread use of vision systems in the industrial field, different devices and different locations of the devices have different requirements for the light source, and a light source driver capable of being applied to various conditions is needed.
The light source controller on the market generally adopts constant voltage or constant current mode at present, and the constant voltage mode is with low costs, is applied to miniwatt light source, and the stability of constant current mode and the matching nature of light source are good. The two are selectively used under different working conditions. And cannot switch between the two.
Disclosure of Invention
The invention aims to solve the problems and provides a light source driving circuit with adjustable voltage and current, which can complete the switching of the constant-voltage or constant-current working mode through voltage setting and current setting so as to meet the requirements of various working conditions.
A DC/DC circuit output by a DAC is configured through a register, so that a voltage setting function is realized; and a current control circuit output by the DAC is configured through the register, so that a current setting function is realized. And an ADC sampling circuit is arranged to protect and monitor the output current and voltage state.
The technical scheme adopted by the invention is as follows:
a light source driving circuit with adjustable voltage and current is characterized by comprising a controller, a DAC (digital-to-analog converter), a front-end operational amplifier and a multiplexing switch which are connected by a circuit, wherein the multiplexing switch is connected with a voltage regulating circuit and a current regulating circuit through a follower circuit formed by multiplexing operation amplification, and the voltage regulating circuit outputs regulated voltage through a switching regulator BUCK circuit; the current regulating circuit sets output current through the precise operational amplifier circuit, then sends the set output current to the high-speed operational amplifier circuit and the MOS tube, and outputs regulated voltage through the sampling resistor.
Further, the controller is connected with the DAC through an SPI communication protocol, the DAC is connected with the front-end operational amplifier, and the IN-end and the OUT-end of the front-end operational amplifier are connected to achieve the function of the follower.
Further, a divider resistor is connected between the feedback end and the output end of the switching regulator of the voltage regulating circuit.
Further, the source electrode of the MOS tube of the current regulating circuit is connected with the sampling resistor and is grounded.
Furthermore, the model of the controller is 10M08SAE144CG, the model of the DAC is LTC2641CMS8, the model of the front-end operational amplifier is LMV321 AIDBRR, the model of the multi-path operational amplifier is LMV324AIPWR, the model of the multiplexing switch is ADG608BRU, the model of the switching regulator is LM2576HVS-ADJ, the model of the precision operational amplifier is TL082CDR, the model of the high-speed operational amplifier is LT1363CS8, and the model of the MOS tube is IRFP250NPBF.
The beneficial effects of the invention are:
(1) Through voltage setting and current setting, a constant-voltage or constant-current working mode can be completed so as to match various different working condition requirements;
(2) The single-channel ADC is matched with the multiplex switch to be used, so that the load end voltage and the load current are set skillfully;
(3) The light source driving circuit with constant voltage or constant current output capability is completed by combining the communication interface with external software, different output modes can be set under various working conditions, the types of required light source driving are reduced, and the adaptability of a load light source in industrial application is greatly improved.
Drawings
FIG. 1 is a circuit diagram portion of a register configuration DAC of the present invention;
FIG. 2 is a circuit diagram portion of a multi-way operational amplifier;
FIG. 3 is a portion of a voltage regulation circuit diagram;
fig. 4 is a portion of a current regulating circuit diagram.
Detailed Description
The following describes a specific embodiment of the voltage-current adjustable light source driving circuit according to the present invention in detail with reference to the accompanying drawings.
Referring to fig. 1 and 2, the voltage setting function is achieved by using a DAC conversion circuit including a DAC converter U1, a front-end operational amplifier U2, a multi-way operational amplifier U3, a multiplexer switch U4, a switching regulator U5, and a controller U9.
Microcontroller U9 passes through SPI communication and DAC converter U1
Figure DEST_PATH_IMAGE002
A pin, an SCLK pin,
Figure DEST_PATH_IMAGE004
The pin is connected with the DIN pin. An output pin of the DAC U1 is connected with an IN + pin of a front-end operational amplifier U2, and an IN-pin of the front-end operational amplifier U2 is connected with an OUT front-end pin thereof to form a follower. The OUT pin of the front-end operational amplifier U2 is connected with the D pin of the multiplexing switch U4. And the S1 of the multiplexing switch U4 is connected with an IN + pin of the multiplexing operational amplifier U3, and an IN-pin of the multiplexing operational amplifier U3 is respectively connected to an OUT pin of a corresponding channel, so that the function of a follower is realized.
Referring to fig. 3, the OUT pin signal VSET of the multi-way operational amplifier U3 is connected to the FB pin of the switching regulator U5 through a designated resistor to complete the output voltage V BUS The setting function of (1).
The voltage control process is as follows:
the FPGA receives a voltage setting instruction → D/A conversion → an FB pin of the BUCK IC is adjusted, so that the output voltage of the BUCK circuit is adjusted to reach a set value.
The output voltage of the Buck circuit is set as V BUS (ii) a The FB end voltage of the switching regulator U5 is V FB (ii) a DAC output voltage is V SET (ii) a Known from kirchhoff's law:
V FB /R8= (Vo-V FB )/R7+（V SET -V FB ）/R5
with the addition of a benzodiazepine V FB ，R5，R7，R8
By adjusting V SET Thereby regulating the output voltage Vo
Referring to fig. 1 and 2, as shown in the schematic diagrams of the current setting circuit, the voltage setting function is accomplished by using a DAC conversion circuit, which includes a DAC converter U1, a front-end operational amplifier U2, a multi-path operational amplifier U3, a multiplexing switch U4, a switching regulator U5, and a controller U9.
Microcontroller U9 passes through SPI communication and DAC converter U1
Figure 369259DEST_PATH_IMAGE002
A pin, an SCLK pin,
Figure 224083DEST_PATH_IMAGE004
The pin is connected with the DIN pin; an output pin of the DAC U1 is connected with an IN + pin of a front-end operational amplifier U2, and an IN-pin of the front-end operational amplifier U2 is connected with an OUT pin thereof to form a follower; the OUT pin of the front-end operational amplifier U2 is connected with the D pin of the multiplexing switch U4; and the S2 of the multiplexing switch U4 is connected with the IN + pin of the multiplexing operational amplifier U3, and the IN-pin of the multiplexing operational amplifier U3 is respectively connected with the OUT pin of the corresponding channel, so that the function of a follower is realized.
Referring to FIG. 4, the OUT pin signal I of the multi-way operational amplifier U3 SET The input end of the precision operational amplifier U11 is connected with the input end of the precision operational amplifier U11 through a specified resistor; the IN + pin of the precise operational amplifier U11 is grounded, the Y pin of the precise operational amplifier U11 is connected to the IN-pin of the high-speed operational amplifier U15, the IN + pin of the high-speed operational amplifier U15 is grounded, the Y pin of the high-speed operational amplifier U15 is connected to the G pole of the MOS tube Q1 through a resistor, the D pole of the MOS tube Q1 is connected with the cathode of the load LED, the S pole of the MOS tube Q1 is connected with one end of a sampling resistor, and the sampling resistor R is connected with the sampling resistor R SHUNT The other end is grounded, so that the current control function is completed.
Analysis of the current control process:
the current is set by collecting a sampling resistor R SHUNT Voltage V on 2 =I×R SHUNT To be implemented. Flows through R SHUNT I.e. the current through the load.
Due to the virtual short and the virtual disconnection of the two input ends of the LT1363, the voltage of the two ends is equal and is 0, and the inflow current is 0. Thus, i2= i3.
Thus having (V) 2 -0)/R 2 =(0-V 3 )/R 3 I.e. V 2 =-V 3 ×R 2 /R 3 Establishing V 2 And V 3 Functional relationship between them. V 3 Then I may be passed through the external input by way of a subtractor formed by TL082-B SET Set to control the load current.
I SW The signal controls the on-off of the load path.
The specific elements are selected here as follows: the model of a controller U9 is 10M08SAE144CG, the model of a DAC digital-to-analog converter U1 is LTC2641CMS8, the model of a front-end operational amplifier U2 is LMV321 AIDBR, the model of a multi-path operational amplifier U3 is LMV324AIPWR, the model of a multiplexing switch U4 is ADG608BRU, the model of a switching regulator U5 is LM2576HVS-ADJ, the model of a precision operational amplifier U11 is TL082CDR, the model of a high-speed operational amplifier U15 is LT1363CS8, and the model of a MOS tube Q1 is IRFP250NPBF.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (5)

1. The utility model provides a voltage electric current adjustable light source drive circuit which characterized in that: comprises a controller, a DAC converter, a front-end operational amplifier and a multiplex switch which are connected by circuits, wherein the multiplex switch is a follower circuit formed by multiplex operation amplification and is respectively connected with a voltage regulating circuit and a current regulating circuit,
the voltage regulating circuit outputs regulated voltage through the switching regulator BUCK circuit;
the current regulating circuit sets output current through the precise operational amplifier circuit, then sends the set output current to the high-speed operational amplifier circuit and the MOS tube, and outputs regulated voltage through the sampling resistor.
2. The voltage-current tunable light source driving circuit according to claim 1, wherein: the controller is connected with the DAC through an SPI communication protocol, the DAC is connected with the front-end operational amplifier, and the IN-end and the OUT-end of the front-end operational amplifier are connected to achieve the function of a follower.
3. A voltage-current tunable light source driver circuit according to claim 1 or 2, wherein: and a voltage dividing resistor is connected between the feedback end and the output end of the switching regulator of the voltage regulating circuit.
4. A voltage-current tunable light source driving circuit according to claim 1 or 2, wherein: and the source electrode of the MOS tube of the current regulating circuit is connected with the sampling resistor and is grounded.
5. A voltage-current tunable light source driver circuit according to claim 1 or 2, wherein: the controller is 10M08SAE144CG, the DAC converter is LTC2641CMS8, the front-end operational amplifier is LMV321AIDBVR, the multi-path operational amplifier is LMV324AIPWR, the multiplexing switch is ADG608BRU, the switching regulator is LM2576HVS-ADJ, the precision operational amplifier is TL082CDR, the high-speed operational amplifier is LT1363CS8, and the MOS transistor is IRFP250NPBF.
CN202210960713.7A 2022-08-11 2022-08-11 Voltage and current adjustable light source driving circuit Pending CN115426740A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210960713.7A CN115426740A (en) 2022-08-11 2022-08-11 Voltage and current adjustable light source driving circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210960713.7A CN115426740A (en) 2022-08-11 2022-08-11 Voltage and current adjustable light source driving circuit

Publications (1)

Publication Number Publication Date
CN115426740A true CN115426740A (en) 2022-12-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210960713.7A Pending CN115426740A (en) 2022-08-11 2022-08-11 Voltage and current adjustable light source driving circuit

Country Status (1)

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