CN218735073U - Voltage and current adjustable light source driving circuit - Google Patents
Voltage and current adjustable light source driving circuit Download PDFInfo
- Publication number
- CN218735073U CN218735073U CN202222108591.7U CN202222108591U CN218735073U CN 218735073 U CN218735073 U CN 218735073U CN 202222108591 U CN202222108591 U CN 202222108591U CN 218735073 U CN218735073 U CN 218735073U
- Authority
- CN
- China
- Prior art keywords
- voltage
- current
- operational amplifier
- circuit
- model
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model relates to the technical field of electronic circuits, a light source drive circuit with adjustable voltage and current is disclosed, including circuit connection's controller, DAC converter, front end operational amplifier and multiplex switch, the follower circuit that multiplex switch constitutes through multichannel operational amplification connects voltage regulation circuit and current regulation circuit respectively, voltage regulation circuit passes through switching regulator BUCK circuit output regulating voltage; 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 utility model discloses a voltage setting and current setting accomplish the switching of the mode of constant voltage or constant current to this cooperates the operating mode demand of various differences.
Description
Technical Field
The utility model relates to an electronic circuit technical field especially relates to a voltage current adjustable light source drive circuit.
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.
At present, a light source controller on the market generally adopts a constant voltage mode or a constant current mode, the constant voltage mode is low in cost and is applied to a low-power light source, and the stability of the constant current mode and the matching performance of the light source are good. The two are selectively used under different working conditions. And cannot switch between the two.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the above problem, provide a voltage and current adjustable light source drive circuit, through voltage setting and current setting, accomplish the switching of the mode of constant voltage or constant current to this operating mode demand of the various differences of cooperation.
The DC/DC circuit output by the DAC is configured through the register, and the 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 utility model adopts the technical proposal that:
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 multiplex switch which are connected by a circuit, wherein the multiplex switch is connected with a voltage regulating circuit and a current regulating circuit through a follower circuit consisting of multiplex operational 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.
Furthermore, a voltage dividing 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 utility model has the advantages that:
(1) Through voltage setting and current setting, a constant-voltage or constant-current working mode can be completed, so that various different working condition requirements are met;
(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 regulation circuit diagram.
Detailed Description
The following describes in detail a specific embodiment of the voltage-current adjustable light source driving circuit according to the present invention 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-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
Base pin, SCLK base pin>
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 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. 3, the OUT pin 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
has been administered with a dose of 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 diagram of the current setting circuit, the voltage setting function is accomplished by using a DAC conversion circuit including a DAC converter U1, a front-end operational amplifier U2, a multi-way 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
Base pin, SCLK base pin>
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 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. 4, the OUT pin signal I of the multi-way operational amplifier U3 SET Connected to the IN-pin of the precision operational amplifier U11 through a designated resistor, finishing the setting function of the output current; 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 above 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 the I can be passed through the external input through 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 above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements 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 connected with a voltage regulating circuit and a current regulating circuit through a follower circuit formed by multiplex operational amplification,
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 driving 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 driving circuit according to claim 1 or 2, wherein: the controller is of a model of 10M08SAE144CG, the DAC converter is of a model of LTC2641CMS8, the front-end operational amplifier is of a model of LMV321 AIDBRR, the multi-path operational amplifier is of a model of LMV324AIPWR, the multiplexing switch is of a model of ADG608BRU, the switching regulator is of a model of LM2576HVS-ADJ, the precision operational amplifier is of a model of TL082CDR, the high-speed operational amplifier is of a model of LT1363CS8, and the MOS tube is of a model of IRFP250NPBF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222108591.7U CN218735073U (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 |
|---|---|---|---|
| CN202222108591.7U CN218735073U (en) | 2022-08-11 | 2022-08-11 | Voltage and current adjustable light source driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218735073U true CN218735073U (en) | 2023-03-24 |
Family
ID=85628161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222108591.7U Active CN218735073U (en) | 2022-08-11 | 2022-08-11 | Voltage and current adjustable light source driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218735073U (en) |
-
2022
- 2022-08-11 CN CN202222108591.7U patent/CN218735073U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104883793B (en) | A kind of multipath LED constant current drive circuit and driving method | |
| CN112582876B (en) | Voltage adaptive laser driving circuit and control method thereof | |
| CN109152158B (en) | Constant voltage-to-constant current driving circuit capable of automatically adapting to input and output changes | |
| CN203967995U (en) | A kind of controlled rectification D.C. regulated power supply | |
| CN110299819A (en) | A kind of digitlization power control circuit and method | |
| CN111628537A (en) | Multi-path charging circuit and protocol control module and control method thereof | |
| CN218735073U (en) | Voltage and current adjustable light source driving circuit | |
| CN101711069B (en) | LED driving power supply circuit | |
| CN104798306A (en) | Device for controlling a field effect transistor | |
| CN106385734A (en) | Voltage sampling circuit | |
| CN115426740A (en) | Voltage and current adjustable light source driving circuit | |
| WO2011029383A1 (en) | Led lamp driving circuit | |
| WO2011054196A1 (en) | Pump driving circuit equipment with low power consumption | |
| CN110198581A (en) | A kind of current driver of high efficiency multichannel | |
| CN104253956B (en) | Low-power-consumption stable voltage backlight control circuit and television | |
| CN113271004A (en) | Adjustable boost power supply of high accuracy software | |
| CN105549669A (en) | Constant current source device based on dual ring negative feedback | |
| CN206181440U (en) | Voltage sampling circuit | |
| CN214412379U (en) | Wide-range voltage-adjustable current-adjustable power supply charging device | |
| CN206481043U (en) | One kind carries multiple-channel output single channel short circuit over-current protection circuit | |
| CN109149935A (en) | A kind of control circuit of Switching Power Supply different working modes free switching | |
| CN114153258A (en) | Power supply closed-loop feedback control circuit and control method | |
| CN211406380U (en) | Power parallel driver | |
| CN112399674A (en) | Self-adaptive constant voltage-to-constant current driving circuit | |
| CN108834256B (en) | Constant current control system for automobile LED signal lamp and circuit board structure thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |