CN112203382A - Light source driving device and driving method - Google Patents
Light source driving device and driving method Download PDFInfo
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- CN112203382A CN112203382A CN202011059517.XA CN202011059517A CN112203382A CN 112203382 A CN112203382 A CN 112203382A CN 202011059517 A CN202011059517 A CN 202011059517A CN 112203382 A CN112203382 A CN 112203382A
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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
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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]
- H05B45/10—Controlling the intensity of the light
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Abstract
The invention provides a light source driving device and a driving method, wherein the light source driving device comprises a light source, a feedback circuit, a first operational amplification circuit and a driving circuit, wherein the feedback circuit is connected with the light source and is configured to acquire feedback voltage representing the light intensity of the light source; the reference voltage input end of the first operational amplification circuit is connected with the reference voltage power supply end, the feedback voltage input end is connected with the output end of the feedback circuit, and the first operational amplification circuit is configured to receive the feedback voltage and obtain a difference voltage according to the feedback voltage and the reference voltage; the input end of the driving circuit is respectively connected with the output end of the first operational amplification circuit and the preset driving voltage supply end, the output end of the driving circuit is connected with the light source, and the driving circuit is configured to receive the difference voltage and adjust the supply current of the light source according to the difference voltage and the preset driving voltage. By implementing the invention, the efficiency and the accuracy of light intensity regulation of the light source can be improved while the circuit cost is saved.
Description
Technical Field
The invention relates to the technical field of light source driving, in particular to a light source driving device and a driving method.
Background
In the conventional light source driving circuit, the light intensity emitted by the light source is easy to change along with the problems of temperature change, attenuation of the light source and the like in the long-term use process of the light source. In some application scenarios with higher requirements for light source stability, for example, when a chemical instrument is used to detect pollutants in water, the light intensity emitted by the light source of the chemical instrument needs to have good stability, so as to achieve the purpose of accurate detection.
In order to solve the above problems in the prior art, the light intensity of the light source is usually judged directly by the controller and then adjusted by the controller, the technical scheme needs to occupy a large amount of operation time of the controller chip and the operation amount is on adjusting the light intensity, the cost of the controller chip is high and the adjusting efficiency is affected, moreover, the controller is adopted to directly collect the light intensity and control the current, the adjusting precision is not high, and if an external ADC chip or DAC chip is adopted, the adjusting precision can be improved, but the circuit cost can be increased.
Disclosure of Invention
In view of this, embodiments of the present invention provide a light source driving apparatus and a driving method thereof, so as to achieve the purpose of saving circuit cost and improving efficiency and accuracy of light intensity adjustment of a light source.
According to a first aspect, an embodiment of the present invention provides a light source driving apparatus, including a light source, further including: a feedback circuit connected to the light source, the feedback circuit configured to collect a feedback voltage indicative of a light intensity of the light source; a first operational amplifier circuit having a reference voltage input terminal and a feedback voltage input terminal, the reference voltage input terminal being connected to a reference voltage supply terminal, the feedback voltage input terminal being connected to an output terminal of the feedback circuit, the first operational amplifier circuit being configured to receive the feedback voltage and obtain a difference voltage from the feedback voltage and the reference voltage; and the input end of the driving circuit is respectively connected with the output end of the first operational amplification circuit and a preset driving voltage supply end, the output end of the driving circuit is connected with the light source, and the driving circuit is configured to receive the difference voltage and adjust the supply current of the light source according to the difference voltage and the preset driving voltage.
Preferably, the driving circuit includes a second operational amplification circuit and a constant current source circuit; the second operational amplifier circuit has a first voltage input terminal and a second voltage input terminal, the first voltage input terminal is connected with the output terminal of the first operational amplifier circuit, the second voltage input terminal is connected with the preset driving voltage supply terminal, and the second operational amplifier circuit is configured to obtain the supply voltage of the light source according to the difference voltage and the preset driving voltage; the input end of the constant current source circuit is connected with the output end of the second operational amplification circuit, the output end of the constant current source circuit is connected with the light source, and the constant current source circuit is configured to output the supply current of the light source according to the supply voltage.
Preferably, the second operational amplification circuit comprises an adder configured to sum the difference voltage and the preset driving voltage to obtain a supply voltage of the light source.
Preferably, the first operational amplifier circuit comprises an error amplifier, an input end of the error amplifier is respectively connected with the reference voltage supply end and an output end of the feedback circuit, and the error amplifier is configured to obtain a difference value between the feedback voltage and the reference voltage and perform inverse amplification to obtain the difference voltage.
Preferably, the first operational amplifier circuit further includes a band-pass filter, an input end of the band-pass filter is connected to the output end of the error amplifier, and an output end of the band-pass filter is connected to the input end of the driving circuit.
Preferably, the power supply driving device further comprises a reference voltage circuit, an output terminal of the reference voltage circuit is connected to a reference voltage input terminal of the first operational amplification circuit, and is configured to provide a reference voltage for the first operational amplification circuit.
Preferably, the power driving apparatus further comprises a preset driving voltage circuit, an output end of the preset driving voltage circuit is connected to an input end of the driving circuit, and is configured to provide the driving circuit with a preset driving voltage for driving the light source.
According to a second aspect, an embodiment of the present invention provides a light source driving method applied to a light source driving apparatus including a light source, the light source driving method including: collecting feedback voltage representing the light intensity of the light source; obtaining a difference voltage according to the feedback voltage and the reference voltage through a first operational amplifier circuit; and adjusting the power supply current of the light source according to the difference voltage and a preset driving voltage.
Preferably, the driving circuit includes a second operational amplification circuit and a constant current source circuit; the adjusting the power supply current of the light source according to the difference voltage and the preset driving voltage includes: acquiring a power supply voltage of the light source according to the difference voltage and the preset driving voltage through the second operational amplifier circuit; and outputting the power supply current of the light source according to the power supply voltage by the constant current source circuit.
Preferably, the acquiring the feedback voltage representing the light intensity of the light source comprises: acquiring feedback voltage representing the light intensity of the light source through a feedback circuit; and determining the reference voltage according to a distance between the feedback circuit and the light source.
The technical scheme of the embodiment of the invention has the following advantages:
1. the embodiment of the invention provides a light source driving device which comprises a feedback circuit, a first operational amplification circuit and a driving circuit. Firstly, a feedback circuit can collect feedback voltage representing light intensity of a light source and send the feedback voltage to a first operational amplification circuit, the first operational amplification circuit obtains difference voltage according to the feedback voltage and reference voltage after obtaining the feedback voltage, voltage errors caused by the feedback circuit can be eliminated, then the calculated difference voltage is sent to a driving circuit, and the driving circuit adjusts power supply current of the light source according to the difference voltage and preset driving voltage after receiving the difference voltage, namely, the preset driving voltage is adjusted. The preset driving voltage is theoretically the voltage required by the light source to reach the preset light intensity, but as the service time of the light source and the temperature change in the circuit, the preset driving voltage often cannot enable the light source to reach the preset light intensity and keep stable. The whole light source driving circuit does not need a controller chip to calculate and adjust the light intensity, but can be realized through a feedback circuit and an operational amplification circuit, extra software control is not needed, the light source driving device is low in cost, the adjustment of the light intensity through a hardware circuit can reduce the operation amount and the operation time of the driving device, and the light intensity adjustment precision and the adjustment efficiency are improved.
2. The embodiment of the invention provides a light source driving method which comprises the steps of collecting feedback voltage representing light intensity of a light source, obtaining difference voltage according to the feedback voltage and reference voltage through a first operational amplification circuit, and adjusting power supply current of the light source according to the difference voltage and preset driving voltage. According to the light source driving method, after the feedback voltage representing the light intensity is collected, the difference voltage of the reference voltage and the feedback voltage is obtained through the first operational amplifier, so that errors in a circuit for collecting the feedback voltage are eliminated, then the preset driving voltage is adjusted according to the difference voltage, and the actual power supply voltage is obtained, so that the light intensity of the light source can be automatically adjusted in real time, the light source is not influenced by attenuation of the light source in the service life, stable light intensity is kept, the operation amount and operation time of the driving device can be reduced, and the light intensity adjustment precision and adjustment efficiency are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic view of a light source driving apparatus according to an embodiment of the present invention;
fig. 2 is another schematic diagram of a light source driving apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a light source driving method according to an embodiment of the invention;
reference numerals: 1-a light source; 2-a feedback circuit; 3-a first operational amplifier circuit, 31-an error amplifier, 32-a band-pass filter; 4-a driving circuit, 41-a second operational amplification circuit, 42-a constant current source circuit; 5-a reference voltage circuit; 6-preset driving voltage circuit.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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 invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
In some application scenarios with higher requirements for light source stability, for example, when a chemical instrument is used to detect pollutants in water, the light intensity emitted by the light source of the chemical instrument needs to have good stability, so as to achieve the purpose of accurate detection. The light source is, for example, a laser, an LED lamp, etc., and the embodiments of the present invention are not limited thereto.
An embodiment of the present invention provides a light source driving apparatus, as shown in fig. 1, the light source driving apparatus includes a light source 1, a feedback circuit 2, a first operational amplifier circuit 3, and a driving circuit 4.
The feedback circuit 2 is connected to the light source 1, the first operational amplifier circuit 3 has a reference voltage input terminal and a feedback voltage input terminal, and the output terminal of the feedback circuit 2 is connected to the feedback voltage input terminal of the first operational amplifier circuit 3. The output end of the first operational amplifier circuit 3 is connected to the driving circuit 4, and the output end of the driving circuit 4 is connected to the light source 1.
Specifically, feedback circuit 2 can gather the feedback voltage of the light intensity of representation light source 1 in real time, and here, feedback circuit 2 can be including the sensor that can gather the light intensity signal, convert the light intensity signal into current signal, then through the I/V converting circuit, convert current signal into voltage signal, and then amplify voltage signal through amplifier circuit, later carry out filtering process again, send to first operational amplifier circuit 3. It is to be understood that this is by way of illustration only and that the embodiments of the invention are not limited thereto.
After receiving the feedback voltage sent by the feedback circuit 2, the first operational amplifier circuit 3 calculates a difference between the input reference voltage and the feedback voltage, amplifies the difference according to a certain proportion to obtain a difference voltage, and sends the difference voltage to the drive circuit 4. Here, because in practical application and in different use scenarios, the setting distance between the sensor acquiring the light intensity signal of the light source 1 in the feedback circuit 2 and the light source 1 may be different, in order to ensure stability and accuracy of the light intensity adjustment of the final light source 1, the reference voltage in the embodiment of the present invention may be set according to the distance between the feedback circuit 2 and the light source 1, for example, the closer the sensor acquiring the light intensity signal to the light source 1, the larger the value of the reference voltage may be, and the farther the sensor is from the light source 1, the smaller the value of the reference voltage may be, so that when the difference between the feedback voltage and the reference voltage is calculated, an error caused by the distance between the feedback voltage and the light source 1 may be eliminated, and the calculation accuracy of the final supply current of the light source 1 may be improved.
After receiving the difference voltage, the driving circuit 4 adjusts the preset driving voltage according to the difference voltage, so as to obtain an actual supply current which enables the light source 1 to reach the preset light intensity and then drive the light source 1 to emit light. The preset driving voltage is theoretically a voltage required for the light source 1 to reach a preset light intensity, but the preset driving voltage often cannot make the light source reach the preset light intensity and keep stable due to the use time of the light source 1 and the temperature change in the circuit. The embodiment of the invention adjusts the preset driving voltage in real time through the differential voltage, thereby automatically compensating the light source intensity in real time, not being influenced by the attenuation of a light source in the service life of the light source, and maintaining stable light intensity.
In some preferred implementations, the reference voltage may be provided by a reference voltage circuit 5, as shown in fig. 2. The reference voltage is, for example, 0.4V, and the reference voltage circuit 5 includes, for example, a voltage source of 5V, and then the reference voltage is converted into a reference voltage of 0.4V by the operational amplifier circuit and supplied to the first operational amplifier circuit 3. The preset drive voltage may also be provided by the preset drive voltage circuit 6. The preset driving voltage 6 may be, for example, 2V, and similarly, may also be provided by a voltage source and an operational amplifier circuit, which is not limited in this embodiment of the invention.
Preferably, as shown in fig. 2, the driving circuit 4 may include a second operational amplification circuit 41 and a constant current source circuit 42. The first voltage input end of the second operational amplifier circuit 41 is connected to the output end of the first operational amplifier circuit 3, the second voltage input end is connected to the output end of the preset driving voltage circuit 6, and the difference voltage and the preset driving voltage are calculated and summed through the second operational amplifier circuit 41 to obtain the power supply voltage of the light source 1. The difference voltage here may be a positive value or a negative value. Then, the second operational amplifier circuit 41 sends the supply voltage to the constant current source circuit 42, and the constant current source circuit 42 outputs a stable supply current to the light source, so that the light source 1 stably emits a desired light intensity. As an example, the second operational amplifier circuit 41 may be an adder, and the adder sums the difference voltage and the preset driving voltage to obtain the power supply voltage of the light source. It is to be understood that the second operational amplifier circuit 41 may also be other operational amplifier devices capable of implementing the embodiments of the present invention, and the present embodiment is not limited thereto.
In some preferred implementations of the embodiment of the present invention, the first operational amplifier circuit 3 may include an error amplifier 31 and a band-pass filter 32. The input terminals of the error amplifier 31 are connected to the reference voltage supply terminal and the output terminal of the feedback circuit 2, respectively. That is, after the feedback circuit 2 sends the obtained feedback voltage to the error amplifier 31, the error amplifier 31 calculates a difference between the input feedback voltage and the reference voltage and performs inverse amplification to obtain a difference voltage. Then, the difference voltage is input to the next stage of band-pass filter 32 for filtering, and the band-pass filter 32 may be formed by multiple feedbacks, so as to obtain the difference voltage of the actual application frequency band, thereby improving the accuracy of the finally calculated power supply current. For example, if the feedback voltage is 0.8V, the reference voltage is 0.4V, and the difference is 0.4V (indicating that the light intensity of the light source exceeds the preset light intensity), the difference is-0.4V after being amplified by the error amplifier, and then the preset driving voltage is adjusted to 2V, so that the actual supply voltage is 1.6V, and the supply current of the light source is adjusted by the actual supply voltage, thereby reducing the brightness of the light source and maintaining the light intensity of the light source 1 stable. On the contrary, when the light intensity is weakened, the power supply current can be increased by the embodiment of the present invention, so that the light intensity of the light source 1 reaches the preset light intensity.
The light source driving device provided by the embodiment of the invention can eliminate the voltage error caused by the feedback circuit 2, and can adjust the preset driving voltage in real time through the difference voltage, so that the power supply current required by the required light intensity is obtained, the light intensity of the light source 1 is compensated in real time, the influence of the attenuation of the light source is avoided in the service life of the light source, and the stable light intensity is kept. The whole light source driving circuit does not need a controller chip to calculate and adjust the light intensity, but can be realized through a feedback circuit and an operational amplification circuit, extra software control is not needed, the light source driving device is low in cost, the adjustment of the light intensity through a hardware circuit can reduce the operation amount and the operation time of the driving device, and the light intensity adjustment precision and the adjustment efficiency are improved.
Example 2
An embodiment of the present invention provides a light source driving method, which can be applied to the light source driving apparatus in any implementation manner of embodiment 1, and as shown in fig. 3, the light source driving method includes:
In the embodiment of the invention, the feedback voltage representing the light intensity of the light source can be acquired through the feedback circuit. The feedback circuit here can refer to the description in embodiment 1, and is not described here again.
In the embodiment of the present invention, the reference voltage may be set according to a distance between the feedback circuit and the light source, for example, the closer the sensor is to the light source, the larger the value of the reference voltage may be, and the farther the sensor is from the light source, the smaller the value of the reference voltage may be, so that when a difference between the reference voltage and the feedback voltage is calculated, an error caused by the distance between the feedback voltage and the light source may be eliminated, and the final calculation accuracy of the supply current of the light source is improved.
And 303, adjusting the power supply current of the light source according to the difference voltage and the preset driving voltage.
After the difference voltage is obtained, the difference voltage and the preset driving voltage can be summed, and the difference voltage can be a positive value or a negative value, namely when the light intensity of the light source exceeds the preset light intensity, the difference voltage is a negative value, and the difference voltage and the preset driving voltage are summed, so that the actual power supply voltage is reduced, the power supply current is adjusted, and the light intensity of the light source is reduced; when the light intensity of the light source is smaller than the preset light intensity, the difference voltage is a positive value, and the difference voltage and the preset driving voltage are summed, so that the actual power supply voltage is increased, the power supply current is adjusted, the light intensity of the light source is increased, and finally the light intensity of the light source is kept stable.
In some preferred implementations of the embodiment of the present invention, the driving circuit includes a second operational amplifier circuit and a constant current source circuit, and the step 303 may specifically include: acquiring a power supply voltage of the light source through a second operational amplifier circuit according to the difference voltage and a preset driving voltage; and outputting the power supply current of the light source at constant current according to the power supply voltage through the constant current source circuit. For a specific implementation, reference may be made to the related description in embodiment 1, and details are not described here.
The light source driving method comprises the steps of firstly collecting feedback voltage representing light intensity of a light source, then obtaining difference voltage according to the feedback voltage and reference voltage through a first operational amplifier circuit, and then adjusting power supply current of the light source according to the difference voltage and preset driving voltage. According to the light source driving method, after the feedback voltage representing the light intensity is collected, the difference voltage of the reference voltage and the feedback voltage is obtained through the first operational amplifier, so that errors in a circuit for collecting the feedback voltage are eliminated, then the preset driving voltage is adjusted according to the difference voltage, and the actual power supply voltage is obtained, so that the light intensity of the light source can be automatically adjusted in real time, the light intensity is not influenced by attenuation of a light source in the service life of the light source, stable light intensity is kept, the operation amount and operation time of the driving device are reduced, and the light intensity adjustment precision and adjustment efficiency are improved.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A light source driving device including a light source, characterized by further comprising:
a feedback circuit connected to the light source, the feedback circuit configured to collect a feedback voltage indicative of a light intensity of the light source;
a first operational amplifier circuit having a reference voltage input terminal and a feedback voltage input terminal, the reference voltage input terminal being connected to a reference voltage supply terminal, the feedback voltage input terminal being connected to an output terminal of the feedback circuit, the first operational amplifier circuit being configured to receive the feedback voltage and obtain a difference voltage from the feedback voltage and the reference voltage;
and the input end of the driving circuit is respectively connected with the output end of the first operational amplification circuit and a preset driving voltage supply end, the output end of the driving circuit is connected with the light source, and the driving circuit is configured to receive the difference voltage and adjust the supply current of the light source according to the difference voltage and the preset driving voltage.
2. The light source driving device according to claim 1, wherein the driving circuit includes a second operational amplification circuit and a constant current source circuit;
the second operational amplifier circuit has a first voltage input terminal and a second voltage input terminal, the first voltage input terminal is connected with the output terminal of the first operational amplifier circuit, the second voltage input terminal is connected with the preset driving voltage supply terminal, and the second operational amplifier circuit is configured to obtain the supply voltage of the light source according to the difference voltage and the preset driving voltage;
the input end of the constant current source circuit is connected with the output end of the second operational amplification circuit, the output end of the constant current source circuit is connected with the light source, and the constant current source circuit is configured to output the supply current of the light source according to the supply voltage.
3. The light source driving apparatus according to claim 2, wherein the second operational amplifier circuit comprises an adder configured to sum the difference voltage and the preset driving voltage to obtain a supply voltage of the light source.
4. The light source driving apparatus according to claim 1, wherein the first operational amplifier circuit comprises an error amplifier having an input terminal connected to the reference voltage supply terminal and an output terminal of the feedback circuit, respectively, and the error amplifier is configured to obtain a difference between the feedback voltage and the reference voltage and perform inverse amplification to obtain the difference voltage.
5. The light source driving device according to claim 4, wherein the first operational amplifier circuit further comprises a band-pass filter having an input terminal connected to the output terminal of the error amplifier and an output terminal connected to the input terminal of the driving circuit.
6. The light source driving device according to claim 1, further comprising a reference voltage circuit, wherein an output terminal of the reference voltage circuit is connected to a reference voltage input terminal of the first operational amplifier circuit, and is configured to provide a reference voltage for the first operational amplifier circuit.
7. The light source driving apparatus according to any one of claims 1 to 6, further comprising a preset driving voltage circuit, wherein an output terminal of the preset driving voltage circuit is connected to an input terminal of the driving circuit, and is configured to provide the driving circuit with a preset driving voltage for driving the light source.
8. A light source driving method is applied to a light source driving device, the light source driving device comprises a light source, and the light source driving method comprises the following steps:
collecting feedback voltage representing the light intensity of the light source;
obtaining a difference voltage according to the feedback voltage and the reference voltage through a first operational amplifier circuit;
and adjusting the power supply current of the light source according to the difference voltage and a preset driving voltage.
9. The light source driving method according to claim 8, wherein the driving circuit includes a second operational amplification circuit and a constant current source circuit; the adjusting the power supply current of the light source according to the difference voltage and the preset driving voltage includes:
acquiring a power supply voltage of the light source according to the difference voltage and the preset driving voltage through the second operational amplifier circuit;
and outputting the power supply current of the light source according to the power supply voltage by the constant current source circuit.
10. The method of claim 9, wherein the collecting the feedback voltage indicative of the light intensity of the light source comprises:
acquiring feedback voltage representing the light intensity of the light source through a feedback circuit; and
the reference voltage is determined according to a distance between the feedback circuit and the light source.
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| CN114567944A (en) * | 2022-02-18 | 2022-05-31 | 广东盈峰科技有限公司 | Mercury lamp constant current drive arrangement |
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