CN217789660U - Precise multi-channel self-calibration constant-current driving circuit - Google Patents
Precise multi-channel self-calibration constant-current driving circuit Download PDFInfo
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Abstract
The application relates to a precise multi-channel self-calibration constant current driving circuit, and relates to the field of constant current driving circuits. Comprises a singlechip; the output module comprises a current control end and a current amplification end; the current control end is connected with the singlechip, and the current amplification end outputs amplified current which is amplified by the DAC control current; the light-emitting module comprises a plurality of light-emitting elements which are connected in parallel and connected with the output module; the multi-channel module comprises a switch control end and a plurality of multiplexing switches, the switch control end is connected with the single chip microcomputer, and the plurality of multiplexing switches are respectively connected with the light-emitting elements; and the photosensitive feedback module is connected with the singlechip and can feed back the output voltage feedback signal to the singlechip. And the current sampling and amplifying module comprises a sampling input end and an amplifying output end, the sampling input end is connected between the output module and the light-emitting module, and the amplifying output end is connected with the single chip microcomputer. The method and the device can relieve the problem that the multi-channel circuit needs frequent manual calibration in application.
Description
Technical Field
The application relates to the field of constant current drive circuits, in particular to a precise multi-channel self-calibration constant current drive circuit.
Background
Optical density measurement is a common measurement requirement, and an optical density detection device is composed of a light source and a photosensitive element, wherein the luminous intensity of the light source has a strong positive correlation with the working current, so a constant current source circuit is usually required for driving. The most commonly used constant current source circuit has a mutual clamping constant current circuit composed of two triodes or operational amplifiers.
In order to utilize the dynamic range of the photosensitive element as much as possible, achieve the largest possible measurement range, and improve the measurement accuracy in multi-channel measurement, it is required to calibrate the current of the light source of each detection channel in advance so that the output values of the photosensitive element are substantially equal in an idle condition. In this case, the current required for each channel is different, and different sampling resistor values must be set. Because the resistance value can take any value, only variable resistors can be used, the size is large, manual calibration is needed one by one, and time and labor are wasted.
In view of the above-mentioned related art, the inventor considers that the multi-channel circuit has a problem in application that frequent manual calibration is required.
SUMMERY OF THE UTILITY MODEL
In order to meet the requirement of a multi-channel circuit on convenient use, the application provides a precise multi-channel self-calibration constant-current driving circuit.
The application provides a precision multichannel self-calibration constant current driving circuit, which adopts the following technical scheme:
a precise multi-channel self-calibration constant current drive circuit comprises a singlechip;
the output module comprises a current control end and a current amplification end; the current control end is connected with the single chip microcomputer and receives DAC control current from the single chip microcomputer, and the current amplification end outputs amplified current amplified by the DAC control current;
the light emitting module comprises a plurality of light emitting elements which are connected in parallel and are used for being connected with the output module;
the multi-channel module comprises a switch control end and a multi-channel multiplexing switch, the switch control end is connected with the single chip microcomputer, and the multi-channel module receives a control signal of the single chip microcomputer; the multiplex switches are respectively connected with the light-emitting elements and can control the on-off of the parallel branches of the light-emitting elements;
the photosensitive feedback module receives the luminous intensity of the luminous module and converts the luminous intensity into a voltage feedback signal, the photosensitive element is connected with the single chip microcomputer, and the photosensitive element can feed the output voltage feedback signal back to the single chip microcomputer;
the current sampling and amplifying module comprises a sampling input end and an amplifying output end; the sampling input end is connected between the output module and the light-emitting module and is used for acquiring sampling voltage corresponding to the amplified current; the amplifying output end is connected with the single chip microcomputer, and the current sampling amplifying module (6) amplifies the sampling voltage by a preset multiple to generate an amplifying voltage which is output to the single chip microcomputer by the amplifying output end.
By adopting the technical scheme, the output module receives the current from the DAC of the singlechip and outputs the amplified current, and only one light-emitting element is conducted each time by using the multiplexing switch, so that the light-emitting element emits light. The photosensitive element outputs the voltage signal to an ADC port of the single chip microcomputer, and the single chip microcomputer adjusts the output of the DAC according to the voltage value output by the photosensitive element until the output voltage of the photosensitive element of the channel meets the requirement. At this moment, through current sampling amplifier circuit, the current value of the passageway and the DAC output value at this moment are noted to the singlechip. And repeating the above process for each channel until all the channels are calibrated, and recording the current value and the DAC value of each channel by the singlechip.
During formal measurement, one light-emitting element emits light each time, the singlechip outputs DAC according to the recorded value, and the current value at the moment is measured through the current sampling and amplifying circuit. If the current value is different from the recorded value, the output of the DAC is adjusted according to the difference until the current value is equal to the recorded value. Thereafter, the light intensity at this time is read by the photosensor, and the optical density is calculated together with the light intensity at the time of calibration.
According to the scheme, the current of each channel is not required to be adjusted by the resistance value, automatic calibration is carried out through the feedback of the output of the DAC of the single chip microcomputer and the input of the ADC of the single chip microcomputer, and the trouble of manual calibration is avoided. And each channel is independently measured by utilizing the storage and processing capacity of the single chip microcomputer. Only one current sampling amplifying circuit is needed, all channels can be dealt with, elements are saved, the size can be greatly reduced, and cost and power consumption can be saved. The constant current precision depends on the DAC output quantization precision of the single chip microcomputer, at present, 10-12 bit DAC output can be made by a plurality of single chip microcomputers, the constant current precision can be below 0.1%, and the current precision is not output to an operational amplifier precision constant current circuit. The requirement of convenient use of the multi-channel circuit is met.
Optionally, the output module is an amplifying triode, the amplifying triode is a PNP triode, and a base of the amplifying triode forms the current control terminal; and the emitting electrode of the amplifying triode is used for being connected with a power supply VCC, and the collecting electrode of the amplifying triode forms the current amplifying end.
Optionally, the output module is an amplifying triode, the amplifying triode is an NPN triode suitable for use when the current is large or the voltage required by the light emitting element is high, and a base of the amplifying triode forms the current control terminal; the emitting electrode of the amplifying triode is grounded, and the collector electrode of the amplifying triode forms the current amplifying end.
Optionally, an N-MOSFET for turning on the light emitting element is connected between the light emitting element and the multiplexing switch.
Optionally, the multichannel module is a PCF8575RGER 16-way multiplexing switch chip.
Optionally, the current sampling and amplifying module includes a sampling module and an amplifying module; the sampling module is connected between the output module and the light-emitting module and used for acquiring sampling voltage; the sampling module is connected with the amplifying module, and the sampling module receives the sampling voltage output by the sampling module; the amplifying module outputs an amplifying voltage to the single chip microcomputer based on the input sampling voltage.
Optionally, the sampling module includes a current sampling resistor R2, one end of the current sampling resistor R2 is connected to the collector of the amplifying triode, and the other end of the current sampling resistor R2 is connected to the light emitting module.
Optionally, the amplifying module includes an operational amplifier, a limiting resistor R3, a limiting resistor R4, a limiting resistor R5, a limiting resistor R6, and a decoupling capacitor C1, where a non-inverting input terminal of the operational amplifier is connected to one end of the limiting resistor R4 and one end of the limiting resistor R6, respectively; the other end of the limiting resistor R4 is connected with the current input end of the current sampling resistor R2; the other end of the limiting resistor R6 is grounded; the inverting input end of the operational amplifier is respectively connected with one end of the limiting resistor R5 and one end of the limiting resistor R3; the other end of the limiting resistor R3 is connected with the current output end of the current sampling resistor R2; the other end of the limiting resistor R5 is connected with the output end of the operational amplifier; the positive power end of the operational amplifier is connected with the power supply VCC; the power supply VCC is connected with one end of the decoupling capacitor C1; the other end of the decoupling capacitor C1 is grounded; the output end of the operational amplifier is connected with the single chip microcomputer, the amplification module amplifies the sampling voltage by a preset multiple to generate an amplified voltage, and the amplified voltage is output to the single chip microcomputer through the output end of the operational amplifier.
In summary, the present application includes at least one of the following beneficial technical effects:
(1) The circuit of the scheme does not need to adjust the current of each channel by using resistance values, and automatic calibration is carried out by feedback of the output of the single chip microcomputer DAC and the input of the single chip microcomputer ADC, so that the trouble of manual calibration is avoided.
(2) And each channel is independently measured by utilizing the storage and processing capacity of the single chip microcomputer. The current sampling amplifying circuit only needs one circuit, and all channels can be dealt with, so that elements are saved, the size can be greatly reduced, and the cost and the power consumption are saved.
(3) The constant current precision of the circuit depends on the DAC output quantization precision of the single chip microcomputer, at present, 10-12 bit DAC output can be made by a plurality of single chip microcomputers, the constant current precision can be below 0.1%, and the constant current precision is not output to the operational amplifier precision constant current circuit.
Drawings
Fig. 1 is a schematic block diagram of a precision multi-channel self-calibration constant current driving circuit according to one embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of the PNP transistor in the first embodiment.
Fig. 3 is a schematic circuit diagram of the second embodiment in which the amplifying transistor is an NPN transistor.
Reference numerals are as follows: 1. a single chip microcomputer; 2. an output module; 3. a light emitting module; 4. a multi-channel module; 5. a photosensitive feedback module; 6. a current sampling and amplifying module; 61. a sampling module; 62. and an amplifying module.
Detailed Description
The present application is described in further detail below with reference to the accompanying drawings.
The embodiment of the application discloses a precise multi-channel self-calibration constant-current driving circuit.
Example 1.
Referring to the attached drawing 1, the device comprises a single chip microcomputer 1, an output module 2, a light emitting module 3, a multi-channel module 4, a photosensitive feedback module 5 and a current sampling and amplifying module 6.
The output module 2 is connected with the single chip microcomputer 1, the output module 2 receives control current from the single chip microcomputer 1 to output amplified current, the light-emitting module 3 is connected with the output module 2, the multi-channel module 4 is connected with the single chip microcomputer 1 to receive control signals of the single chip microcomputer 1, the multi-channel module 4 is further connected with the light-emitting module 3, and the on-off of the light-emitting module 3 can be controlled. The photosensitive feedback module 5 is connected with the singlechip 1 and feeds back the received voltage value. The current sampling and amplifying module 6 is connected between the output module 2 and the light emitting module 3, the current sampling and amplifying module 6 is further connected with the single chip microcomputer 1, and the single chip microcomputer 1 can record a sampling and amplifying current value through the current sampling and amplifying module 6 and a DAC output value at the moment.
The output module 2 comprises a current control end and a current amplification end, the current control end is connected with the single chip microcomputer 1 and receives control current from a DAC of the single chip microcomputer 1, and the current amplification end outputs amplified current amplified by the DAC control current.
The light emitting module 3 includes a plurality of light emitting elements connected in parallel, and the light emitting elements are connected to the output module 2.
The multi-channel module 4 comprises a switch control end and a multi-channel multiplexing switch, the switch control end is connected with the single chip microcomputer 1, and the multi-channel module 4 receives a control signal of the single chip microcomputer 1. The multiplex switches are respectively connected with the light-emitting elements and can control the on-off of the parallel branches of the light-emitting elements;
the photosensitive feedback module 5 is connected with the single chip microcomputer 1, the photosensitive element receives the luminous intensity of the luminous module 3 and converts the luminous intensity into a voltage feedback signal, and the photosensitive element can feed the output voltage feedback signal back to the single chip microcomputer 1.
A current sampling and amplifying module 6; comprises a sampling input end and an amplifying output end; the sampling input end is connected between the output module 2 and the light-emitting module 3 and is used for acquiring sampling voltage corresponding to the amplified current; the amplifying output end is connected with the single chip microcomputer 1, and the current sampling amplifying module 6 amplifies the sampling voltage by a preset multiple to generate an amplifying voltage which is output to the single chip microcomputer 1 through the amplifying output end.
Specifically, as shown in fig. 2, VCC is 3.3V, which is relatively close to the forward voltage of the semiconductor light emitting element, so that R2 is not required to be large, and the amount of heat generation is reduced. The DAC output of the single chip microcomputer 1 is 10 bits, the output module 2 comprises a power supply VCC and an amplifying triode, the amplifying triode is a PNP type triode, the base electrode of the amplifying triode is connected with the single chip microcomputer 1 to form a current control end, the amplifying triode receives control current from the DAC of the single chip microcomputer 1, a conversion resistor R1 is connected between the single chip microcomputer 1 and the base electrode of the light emitting triode, the single chip microcomputer 1 outputs control current, the power supply VCC is connected with the emitting electrode of the amplifying triode, the collecting electrode of the amplifying triode forms a current amplifying end, and amplifying current amplified by the DAC control current is output.
Referring to fig. 2, the light emitting module 3 includes a plurality of light emitting elements, each light emitting element is a laser diode, each light emitting diode is connected in parallel, the laser diodes are connected to the collector of the amplifying triode, when current passes through the amplifying triode, the laser diodes can emit light, and the number of the laser diodes corresponds to the number of the channels of the multi-channel module 4 one by one.
Referring to fig. 2, the multi-channel module 4 is a PCF8575RGER 16 multiplexing switch chip, the PCF8575RGER 16 multiplexing switch chip is provided with 16 channels, each channel is connected with a corresponding laser diode, and the PCF8575RGER 16 multiplexing switch chip can control the on/off of the laser diodes. The PCF8575RGER 16 multiplexing switch chip is connected with the singlechip 1 and can receive the control signal of the singlechip 1.
Referring to fig. 2, the photosensor is BH1680, BH1680 is set on each channel of PCF8575RGER 16 multiplexing switch chip as a light intensity sensor, the light intensity sensor can convert the measured light intensity signal into a current signal and then convert it into a voltage value that can be processed, and finally the voltage value that can be processed is sent to the ADC port of the single chip microcomputer 1.
Referring to fig. 2, the current sampling and amplifying module 6 includes a sampling module 61 and an amplifying module 62. The sampling module 61 is connected between the output module 2 and the light-emitting module 3 for obtaining a sampling voltage, and is connected with the sampling module 61 and the amplifying module 62, and the sampling module 61 receives the sampling voltage output by the sampling module 61; the amplifying module 62 outputs an amplified voltage to the single chip microcomputer 1 based on the input sampling voltage.
Referring to fig. 2, the sampling module 61 includes a current sampling resistor R2 having a resistance value, one end of the current sampling resistor R2 is connected to the collector of the amplifying transistor, and the other end is connected to the input terminal of the laser diode. The amplifying module 62 includes an operational amplifier, a limiting resistor R5, a limiting resistor R3, a limiting resistor R6, a limiting resistor R4, and a decoupling capacitor C1. The non-inverting input end of the operational amplifier is respectively connected with one end of the limiting resistor R4 and one end of the limiting resistor R6, and the other end of the limiting resistor R4 is connected with the current input end of the current sampling resistor R2. The other end of the limiting resistor R6 is grounded. The inverting input terminal of the operational amplifier is connected to one end of the limiting resistor R5 and one end of the limiting resistor R3, respectively. The other end of the limiting resistor R3 is connected with the current output end of the current sampling resistor R2; the other end of the limiting resistor R5 is connected with the output end of the operational amplifier. The positive power supply end of the operational amplifier is connected with a power supply VCC. The power supply VCC is connected to one end of the decoupling capacitor C1. The other end of the decoupling capacitor C1 is grounded. The output end of the operational amplifier is output to the ADC of the single chip microcomputer 1 through the VC end, the amplification module 62 amplifies the sampling voltage by a preset multiple to generate an amplified voltage, and the amplified voltage is output to the single chip microcomputer 1 through the output end of the operational amplifier.
The implementation principle of the embodiment 1 of the application is as follows: the power VCC utilizes DAC of the single chip 1 to output amplified current through the amplifying triode, and only one channel is conducted each time through the control of the PCF8575RGER 16 multiplexing switch chip, so that the laser diode on the channel emits light. At this time, the BH1680 light intensity sensor arranged on the channel converts the detected light intensity signal into a current signal, converts the current signal into a voltage value which can be processed, and transmits the voltage value to the ADC port of the singlechip 1. The single chip microcomputer 1 adjusts the output of the DAC according to the voltage value output by the BH1680 until the voltage value output by the channel BH1680 meets the requirement. At this time, the single chip microcomputer 1 records the current value of the channel at this time and the DAC output value at this time through the current sampling and amplifying circuit. The above process is repeated for each channel until all channels are calibrated, and the single chip microcomputer 1 records the current value and the DAC value of each channel. During formal measurement, one channel is conducted each time, the single chip microcomputer 1 outputs DAC according to the recorded value, and the current value at the moment is measured through the current sampling amplifying circuit. If the current value is different from the recorded value, the output of the DAC is adjusted according to the difference until the current value is equal to the recorded value. Thereafter, the light intensity at this time is read by the photosensor, and the optical density is calculated together with the light intensity at the time of calibration.
Example 2.
Referring to fig. 3, the present embodiment is different from embodiment 1 in that VCC =8V, the amplifying transistor is an NPN transistor, a base of the amplifying transistor forms a current control terminal, an emitter of the amplifying transistor is grounded, and a collector of the amplifying transistor forms a current amplifying terminal. The light-emitting module 3 further comprises a plurality of N-MOSFETs which can amplify current and prevent the laser diodes from being weak in light-emitting intensity due to too small current which can pass through the multi-channel switch and not meeting the requirement, each channel of the PCF8575RGER 16 multiplexing switch chip is conducted by the N-MOSFET, the input end of each laser diode is connected with VCC, the drain of each N-MOSFET is connected with the output end of each laser diode for the pair, the source of each N-MOSFET is connected with the current sampling resistor R2, the grid of each N-MOSFET is connected with each channel of the PCF8575RGER 16 multiplexing switch chip, a pull-down resistor R7 is connected in parallel at the connection position of the grid of the N-MOSFET and each channel of the PCF8575RGER 16 multiplexing switch chip for enhancing the reliability of the circuit, and the other end of the pull-down resistor R7 is grounded.
The implementation principle of the embodiment 2 is as follows: when the laser diode needs to be driven by higher voltage, VCC selects higher voltage of 8V, the NPN type triode is suitable for the condition of larger current or higher voltage needed by the laser diode, and each channel controls the conduction of the laser diode by the N-MOSFET, so that the passing current of some laser diodes needing to be driven by higher voltage is not limited by the maximum current of the PCF8575RGER 16 multiplexing switch chip.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. A precision multichannel self-calibration constant-current driving circuit is characterized in that: comprises that
A single chip microcomputer (1);
the output module (2), the output module (2) includes the current control end and current amplification end; the current control end is connected with the single chip microcomputer (1) and receives DAC control current from the single chip microcomputer (1), and the current amplification end outputs amplified current amplified by the DAC control current;
the light emitting module (3), the light emitting module (3) comprises a plurality of light emitting elements, the plurality of light emitting elements are connected in parallel, and the light emitting elements are used for being connected with the output module (2);
the multi-channel module (4), the multi-channel module (4) includes a switch control end and a multiplex switch, the switch control end is connected with the single chip microcomputer (1), and the multi-channel module (4) receives a control signal of the single chip microcomputer (1); the multiplex switches are respectively connected with the light-emitting elements and can control the on-off of the parallel branches of the light-emitting elements;
the photosensitive feedback module (5) receives the luminous intensity of the luminous module (3) and converts the luminous intensity into a voltage feedback signal, the photosensitive feedback module (5) is connected with the singlechip (1), and the photosensitive feedback module (5) can feed the output voltage feedback signal back to the singlechip (1);
the current sampling and amplifying module (6) comprises a sampling input end and an amplifying output end; the sampling input end is connected between the output module (2) and the light-emitting module (3) and is used for acquiring sampling voltage corresponding to the amplified current; the amplifying output end is connected with the single chip microcomputer (1), the sampling voltage is amplified by a preset multiple through the current sampling amplifying module (6) to generate an amplifying voltage, and the amplifying voltage is output to the single chip microcomputer (1) through the amplifying output end.
2. The precise multi-channel self-calibration constant-current driving circuit according to claim 1, characterized in that: the output module (2) is an amplifying triode, the amplifying triode is a PNP type triode, and a base of the amplifying triode forms the current control end; and the emitting electrode of the amplifying triode is used for being connected with a power supply VCC, and the collecting electrode of the amplifying triode forms the current amplifying end.
3. The precise multi-channel self-calibration constant-current driving circuit according to claim 1, characterized in that: the output module (2) is an amplifying triode, the amplifying triode is an NPN triode suitable for being used when the current is large or the voltage required by a light-emitting element is high, and the base electrode of the amplifying triode forms the current control end; the emitting electrode of the amplifying triode is grounded, and the collector electrode of the amplifying triode forms the current amplifying end.
4. The precise multi-channel self-calibration constant-current driving circuit according to claim 3, wherein: and an N-MOSFET for conducting the light-emitting elements is connected between the light-emitting elements and the multiplex switch.
5. The precise multi-channel self-calibration constant-current driving circuit according to claim 1, characterized in that: the multichannel module (4) is a PCF8575RGER 16 multiplexing switch chip.
6. The precise multi-channel self-calibration constant-current driving circuit according to claim 2, wherein: the current sampling and amplifying module (6) comprises a sampling module (61) and an amplifying module (62); the sampling module (61) is connected between the output module (2) and the light emitting module (3) and used for acquiring a sampling voltage; the sampling module (61) is connected with the amplifying module (62), and the sampling module (61) receives the sampling voltage output by the sampling module (61); the amplifying module (62) outputs an amplified voltage to the single chip microcomputer (1) based on the input sampling voltage.
7. The precision multi-channel self-calibration constant current driving circuit of claim 6, wherein: the sampling module (61) comprises a current sampling resistor R2, one end of the current sampling resistor R2 is connected with the collector of the amplifying triode, and the other end of the current sampling resistor R2 is connected with the light-emitting module (3).
8. The precise multi-channel self-calibration constant current driving circuit according to claim 7, wherein: the amplifying module (62) comprises an operational amplifier, a limiting resistor R3, a limiting resistor R4, a limiting resistor R5, a limiting resistor R6 and a decoupling capacitor C1, wherein the non-inverting input end of the operational amplifier is respectively connected with one end of the limiting resistor R4 and one end of the limiting resistor R6; the other end of the limiting resistor R4 is connected with the current input end of the current sampling resistor R2; the other end of the limiting resistor R6 is grounded; the inverting input end of the operational amplifier is respectively connected with one end of the limiting resistor R5 and one end of the limiting resistor R3; the other end of the limiting resistor R3 is connected with the current output end of the current sampling resistor R2; the other end of the limiting resistor R5 is connected with the output end of the operational amplifier; the positive power end of the operational amplifier is connected with the power supply VCC; the power supply VCC is connected with one end of the decoupling capacitor C1; the other end of the decoupling capacitor C1 is grounded; the output end of the operational amplifier is connected with the single chip microcomputer (1), and the amplification module (62) amplifies the sampling voltage by a preset multiple to generate an amplified voltage which is output to the single chip microcomputer (1) from the output end of the operational amplifier.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116299360A (en) * | 2023-03-03 | 2023-06-23 | 江南大学 | Calibration light source adjusting control circuit and method for aerosol laser radar |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116299360A (en) * | 2023-03-03 | 2023-06-23 | 江南大学 | Calibration light source adjusting control circuit and method for aerosol laser radar |
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