CN113873714B - Light source driver and sample analyzer - Google Patents
Light source driver and sample analyzer Download PDFInfo
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- CN113873714B CN113873714B CN202010615320.3A CN202010615320A CN113873714B CN 113873714 B CN113873714 B CN 113873714B CN 202010615320 A CN202010615320 A CN 202010615320A CN 113873714 B CN113873714 B CN 113873714B
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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
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Abstract
The invention discloses a light source driver and a sample analyzer, wherein the light source driver comprises: the power supply is connected with the light source and used for generating a power supply voltage for supplying power to the light source; the control part is used for sending out a first control signal when the light source is required to be in a normal working state and sending out a second control signal when the light source is required to be in a standby state; and an execution part connected with the light source, the power supply and the control part, and used for controlling the power supply to output the first voltage based on the received first control signal and controlling the power supply to output the second voltage based on the received second control signal. The invention is beneficial to ensuring the service life and the performance of the light source, is more suitable for being applied to sample analysis scenes, and can ensure the accuracy and the reliability of sample analysis data.
Description
Technical Field
The invention relates to the technical field of light source driving, in particular to a light source driver and a sample analyzer.
Background
In the field of medical equipment, detection and analysis are common application scenarios in which blood, body fluid, tissue samples and the like are taken out of a human body. In sample analysis, it is often necessary to irradiate the measurement sample with a light source, and then use the generated optical characteristics to learn the detection and analysis results of the measurement sample. It can be seen that the operation of the light source is directly related to the accuracy and reliability of the analysis data of the measured sample.
The light source driving mode in the prior art mainly comprises direct switching between an electrified working state and a powered off state of the light source. Specifically, under the condition that the light source is required to work, a power supply required by normal work is provided for the light source, and under the condition that the light source is not required to work, the normal work power supply of the light source is powered off and turned off. The light source driving method has the following problems:
1. the light source goes directly from the powered-on operating state to the powered-off operating state, or directly from the powered-off operating state to the powered-on operating state, back and forth between the two relatively extreme states, which is detrimental to the life and performance of the light source.
2. The light source is directly switched on from the power-off state to the power-on working state, and the cold light source is difficult to quickly enter the stable working state, so that the in-vitro detection aging and speed are influenced, and the accuracy and reliability of the analysis data of the measured sample are influenced.
How to provide a light source driving mode which is beneficial to guaranteeing the service life and performance of a light source, is more suitable for being applied to sample analysis scenes and can guarantee the accuracy and reliability of sample analysis data, and no effective solution exists in the prior art at present.
Disclosure of Invention
The invention aims at the proposal of the problems, provides a light source driver which is favorable for ensuring the service life and the performance of a light source, is more suitable for being applied to a sample analysis scene and can ensure the accuracy and the reliability of sample analysis data, and also provides a sample analyzer with the light source driver.
The invention adopts a technical means that: there is provided a light source driver comprising:
the power supply is connected with the light source and used for generating a power supply voltage for supplying power to the light source; when the power supply voltage is the first voltage, the light source is in a normal working state, and when the power supply voltage is the second voltage, the light source is in a standby state;
the control part is used for sending out a first control signal when the light source is required to be in a normal working state and sending out a second control signal when the light source is required to be in a standby state; and
and an execution part connected with the light source, the power supply and the control part and used for controlling the power supply to output the first voltage based on the received first control signal and controlling the power supply to output the second voltage based on the received second control signal.
The invention adopts another technical means that: there is provided a sample analyzer comprising:
a light source; and
the light source driver; the light source driver is connected with the light source.
By adopting the technical scheme, the light source driver and the sample analyzer can control the power supply to provide the power supply voltage required by the standby state for the light source by using the control part and the execution part, so that the light source can be in the standby state except for the power-on working state and the power-off closing state, and the light source does not need to be always powered, so that standby dormancy treatment can be performed, the energy is saved, the aging of the light source is slowed down, and the service life of the light source is prolonged. The control part sends out the difference of control signals, and then the power supply voltage of control power output is different, is convenient for realize the light source and changes between normal operating condition and standby state, when being applied to sample analysis scene with the light source driver, is favorable to switching the thermal state light source that is in standby state to normal operating condition to time efficiency and the speed of sample analysis have been improved, accuracy and the reliability of survey sample analysis data have been guaranteed.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Wherein:
FIG. 1 is a block diagram of a light source driver in one embodiment;
FIG. 2 is a block diagram of the structure of a light source driver in one embodiment;
FIG. 3 is a block diagram of the structure of a light source driver in one embodiment;
FIG. 4 is a block diagram of the structure of a light source driver in one embodiment;
FIG. 5 is a schematic circuit diagram of a light source driver in one embodiment;
FIG. 6 is a schematic circuit diagram of a light source driver in one embodiment;
FIG. 7 is a schematic diagram of a sample analyzer in one embodiment.
Detailed Description
In order to make the objects, technical solutions and technical effects of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings and detailed description. It should be understood that the detailed description is presented herein for purposes of illustration only and is not intended to limit the invention. Embodiments of the invention and features of the embodiments may be combined with each other without conflict.
The present invention provides a light source driver, as shown in fig. 1, which may include, in one embodiment: a power supply, a control part and an execution part. The power supply is connected with the light source and is used for generating a power supply voltage for supplying power to the light source, and the light source can be an LED light source, a laser light source, or other light sources, such as some light sources which can be applied to a sample analyzer. When the power supply voltage is a first voltage, the light source is in a normal working state, when the power supply voltage is a second voltage, the light source is in a standby state, the second voltage is lower than the first voltage, the first voltage and the second voltage can be generated by the power supply in different time periods according to the control of the control part, namely, the same power supply can generate at least two power supply voltages. The normal working state means that the light source is in a light-emitting state, and meanwhile, the current flowing through the light source reaches the forward working current range of the light source. The standby state refers to a micro-conduction state in which the light source is not emitting light, and the current flowing through the light source is lower than the forward working current of the light source. The control part is used for sending out a first control signal when the light source is required to be in a normal working state, and sending out a second control signal when the light source is required to be in a standby state. The executing part is connected with the light source, the power supply and the control part. The execution part is used for controlling the power supply to output the first voltage based on the received first control signal, and when the power supply voltage is the first voltage, the light source enters a normal working state. The execution part is used for controlling the power supply to output the second voltage based on the received second control signal, and when the power supply voltage is the second voltage, the light source enters a standby state.
The control part and the execution part can be used for controlling the power supply to provide the power supply voltage required by the standby state for the light source, so that the light source can be in the standby state except for the two states of the power-on working state and the power-off closing state, and the light source does not need to be always powered, the standby dormancy treatment can be performed, the energy is saved, the aging of the light source is slowed down, and the service life of the light source is prolonged. The control part sends out the difference of control signals, and then the power supply voltage of control power output is different, is convenient for realize the light source and changes between normal operating condition and standby state, when being applied to sample analysis scene with the light source driver, is favorable to switching the thermal state light source that is in standby state to normal operating condition to time efficiency and the speed of sample analysis have been improved, accuracy and the reliability of survey sample analysis data have been guaranteed.
In one embodiment, the power supply may cease to supply power to the light source in the event that the light source is required to be in a deactivated state. The stop working state means that the light source is in a non-luminous state, meanwhile, the light source does not flow current, and when the power supply stops supplying power to the light source, the light source enters the stop working state. The light source can be switched among the normal working state, the standby state and the stop working state according to the difference of the power supply voltage, for example, when the power supply voltage is changed from the first voltage to the second voltage, the state of the light source is correspondingly switched from the normal working state to the standby state, and when the power supply voltage is changed from the second voltage to the first voltage, the state of the light source is correspondingly switched from the standby state to the normal working state. When the power supply voltage is changed from the first voltage or the second voltage to the no-power supply voltage, the state of the light source is correspondingly switched from the normal working state or the standby state to the stop working state. The state of the light source can be controlled by controlling the power supply of the light source, so that the state of the light source can be controlled by adopting the same power supply.
In one embodiment, as shown in fig. 2, the light source driver may further include a load adjustment part. The load adjusting section is connected to the power supply and the executing section. The execution section controls the load adjustment section to provide a first load based on the received first control signal, and controls the load adjustment section to provide a second load based on the received second control signal, the load adjustment section being capable of adjusting the magnitude of the load provided by itself in accordance with the first control signal or the second control signal. Specifically, the load adjusting part and the light source can be mutually connected between the positive power supply end and the negative power supply end of the power supply in parallel, namely, relative to the output of the power supply, the load adjusting part forms a shunting effect on the light source, the load adjusting part adjusts the shunting effect on the light source by adjusting the self-supplied load, when the load provided by the load adjusting part is larger, the shunting effect on the light source is smaller, the current flowing through the light source is larger, and when the load provided by the load adjusting part is smaller, the shunting effect on the light source is larger, and the current flowing through the light source is smaller. When the load adjustment portion includes a resistor, the load is larger, which means that the resistor is larger, and the load is smaller, which means that the resistor is smaller, i.e., the load is larger corresponding to the resistor is larger, and the load is smaller corresponding to the resistor is smaller. In the case where the second load is lower than the first load, a current flowing through the light source when the load adjustment section supplies the second load is smaller than a current flowing through the light source when the load adjustment section supplies the first load. The load adjusting part can be realized by adopting an adjustable resistor, the load provided by the load adjusting part can be adjusted by adjusting the adjustable resistor, the load adjusting part can also be realized by adopting a plurality of resistors which are mutually connected in series, and the load provided by the load adjusting part can be adjusted by bypassing one or a plurality of resistors. By the configuration of the load adjustment portion, the power supply voltage supplied by the power supply to the light source, that is, the power supply voltage applied to the light source by the power supply can be flexibly adjusted.
In one embodiment, as shown in fig. 4, the executing part may include a first switching part. The first switch part is controlled by the control part. The first switch unit is turned off when the control unit transmits the first control signal, and is turned on when the control unit transmits the second control signal. The load adjustment portion is connected to the first switch portion, and when the first switch portion is turned off, the load adjustment portion provides a first load. The load adjustment section provides a second load when the first switch section is turned on; the second load is lower than the first load. Specifically, the first switch portion may be connected in parallel with a partial load of the load adjustment portion, and when the first switch portion is turned on, a branch where the first switch portion is located may bypass the partial load connected in parallel with the first switch portion, and when the first switch portion is turned off, the partial load connected in parallel with the first switch portion is not bypassed. The first switch part is used for automatically and conveniently adjusting the load adjusting part with a simple structure.
Fig. 5 and 6 show schematic circuit examples of the light source driving circuit according to the present invention, and in one embodiment, as shown in fig. 5 and 6, the power source may have a positive power source terminal and a negative power source terminal for outputting the power supply voltage. The load adjustment part may include a first load resistor R2 and a second load resistor R4 connected in series with each other between the power supply positive terminal VCC2 and the power supply negative terminal GND. The value of the first load is equal to the sum of the resistance values of the first load resistor R2 and the second load resistor R4; the value of the second load is equal to the resistance value of the first load resistor R2. The first load resistor R2 also serves as a feedback resistor of the power supply and acts between the adjustment terminal and the output terminal of the three-terminal voltage regulator U1. The first switch part is provided with a first control end, a first switch end and a second switch end; the first control terminal is configured to receive the first control signal or the second control signal, the second load resistor R4 is connected between the first switch terminal and the switch terminal, the reference VCC2 in fig. 5 and 6 indicates the positive terminal of the power supply, the reference GND indicates the negative terminal of the power supply, and the network reference pwr_en indicates the connection with the control portion, where the control portion may use a single chip microcomputer, a microcontroller, a processor, a CPU, or other electronic devices with control functions. Specifically, the control portion may be connected to the first switch portion via a connection terminal J1. The above reference numbers are examples only and do not limit specific voltage values.
In one embodiment, as shown in fig. 5 and 6, the first switching part may include: the first triode Q1, the first driving resistor R3, the protection resistor R5 and the protection capacitor C3. One end of the first driving resistor R3 is connected to the base electrode of the first triode Q1, and the other end of the first driving resistor R3 is used as the first control end. The protection resistor R5 and the protection capacitor C3 form a parallel branch, and two ends of the parallel branch are respectively connected with the base electrode and the emitter electrode of the first triode Q1. The collector and emitter of the first triode Q1 are respectively used as the first switch end and the second switch end, and the second load resistor R4 is connected between the collector and the emitter of the first triode Q1. Illustratively, the first transistor Q1 shown in fig. 5 and 6 employs SS8050, and the first transistor Q1 may employ transistors, MOS transistors, other controllable electronic switches, and the like.
In one embodiment, as shown in fig. 5 and 6, the power supply may include a DC-DC converter. The DC-DC converter is configured to DC-DC convert an input power source to generate the supply voltage, where the input power source is an external power source or a direct current voltage provided by an internal energy storage module such as a battery, and reference numerals VCC1 and GND in fig. 5 or 6 denote a positive electrode and a negative electrode of the input power source, and the direct current voltage 12V is merely an example, and the input power source may be a direct current voltage of other voltage values.
In one embodiment, as shown in fig. 5 and 6, the DC-DC converter may include a three-terminal regulator U1. The input terminal VIN of the three-terminal voltage regulator U1 is connected to the input power VCC1, the adjustment terminal ADJ of the three-terminal voltage regulator U1 is connected to the output terminals VOUT1, VOUT2, VOUT3, VOUT4 of the three-terminal voltage regulator U1 via the first load resistor R2, and the output terminals VOUT1, VOUT2, VOUT3, VOUT4 of the three-terminal voltage regulator U1 are used as the power supply positive terminal VCC2. The embodiment can achieve the effect of generating two power supply voltages by adopting one power supply chip, simplify the circuit structure and save the development cost, and the schematic circuit diagrams shown in fig. 5 and 6 can achieve the first voltage of 9V and the second voltage of 1.2V, which can be configured and adjusted according to the power supply characteristics of different light sources. The three terminal regulator U1 shown in fig. 5 and 6 employs LM317, but other three terminal regulators or switching power supplies may be used instead.
In one embodiment, as shown in fig. 3, the light source driver may further include a current limiter. The current limiter is used for limiting the current flowing through the light source, and in particular, the current limiter and the light source can be mutually connected between the positive power supply end and the negative power supply end of the power supply in series; the execution part controls the current limiter to be connected to the power supply based on the received first control signal, the current limiter plays a role in limiting the current flowing through the light source when the current limiter is connected to the power supply, the execution part controls the current limiter not to be connected to the power supply based on the received second control signal, and the current limiter cannot limit the current flowing through the light source when the current limiter is not connected to the power supply. The current limiting part of the light source is controlled, so that the current flowing through the light source can be adjusted, and the state of the light source is changed.
In one embodiment, as shown in fig. 4, the executing part may include a second switching part. The second switch part is controlled by the control part. The second switch section is turned off when the control section sends the first control signal, and is turned on when the control section sends the second control signal. The current limiting part is connected with the second switch part, when the second switch part is turned off, the current limiting part is connected with the power supply, and when the second switch part is turned on, the current limiting part is not connected with the power supply. Specifically, the second switch portion may be connected in parallel with the current-limiting portion, and when the second switch portion is turned on, the branch where the second switch portion is located may bypass the current-limiting portion connected in parallel with the second switch portion, and when the second switch portion is turned off, the current-limiting portion connected in parallel with the second switch portion is not bypassed. The adoption of the second switch part is beneficial to automatically and conveniently adjusting the current-limiting part with a simple structure.
In one embodiment, as shown in fig. 5 and 6, the power supply may have a power supply positive terminal VCC2 and a power supply negative terminal GND that output the power supply voltage. The second switch part is provided with a second control end, a third switch end and a fourth switch end; the second control end is used for receiving the first control signal or the second control signal, and the current limiter is connected between the third switch end and the fourth switch end in parallel. The current limiter may include a current limiting resistor R12 disposed between the power supply positive terminal VCC2 and the power supply negative terminal GND; the current limiting resistor R12 and the light source D1 are mutually connected in series. The reference VCC2 in fig. 5 and 6 indicates the positive terminal of the power supply, the reference GND indicates the negative terminal of the power supply, and the network reference pwr_en indicates the connection with the control portion, where the control portion may use a single-chip microcomputer, a microcontroller, a processor, a CPU, or other electronic devices with control functions. Specifically, the control portion may be connected to the second switch portion via the connection terminal J1. The above reference numbers are examples only and do not limit specific voltage values. The light source shown in fig. 5 and 6 is an LED light source D1, specifically, the LED light source D1 may employ the HSE450, and other LED light sources may be employed.
In one embodiment, as shown in fig. 5 and 6, the second switching part may include: a second triode Q4 and a second driving resistor R20; one end of the second driving resistor R20 is connected to the base electrode of the second triode Q4, and the other end of the second driving resistor R is used as the second control end; the collector and the emitter of the second triode Q4 are respectively used as the third switch end and the fourth switch end, and are connected with the current limiter. As a further example, the current limiter in fig. 5 comprises only a current limiting resistor R12. The current limiting portion in fig. 6 includes a current limiting resistor R12 and a triode Q3, where the triode Q3 can be connected with the control portion through a network reference symbol Ctrl via a connection terminal J1, so as to control the conducting state of the triode Q3, and through the configuration of the triode Q3, the light source can be driven by a constant current after exiting from the standby state, and the control portion controls the conducting state of the triode Q3, so as to affect the conducting internal resistance of the triode Q3, thereby adjusting the current flowing through the light source, and the conducting internal resistance of the triode Q3 can be adjusted according to the current variation flowing through the light source, so as to achieve the purpose of constant current driving when the light source is in the normal working state. Illustratively, the second transistor Q4 shown in fig. 5 and 6 employs SS8050, and the second transistor Q4 may employ transistors, MOS transistors, other controllable electronic switches, and the like.
As a specific embodiment, for example, as shown in fig. 5 and 6, in a case where the light source is required to be in a standby state, the control part sends out a second control signal (may be at a high level) to control the first transistor Q1 and the second transistor Q4 to be turned on. At this time, the adjusting terminal ADJ of the three-terminal voltage regulator U1 is grounded, the second load resistor R4 is bypassed by the first triode Q1, and the dc voltage between the power positive terminal VCC2 and the power negative terminal GND is changed from 9V to about 1.2V. Since the second transistor Q4 is turned on, the negative electrode of the LED light source D1 is grounded, and the power supply voltage 1.2V is applied to both ends of the LED light source D1, thereby entering a standby state in which no light is emitted. Under the condition that the light source is required to be in a normal working state, a control part sends a first control signal (can be in a low level) to control the first triode Q1 and the second triode Q4 to be turned off, at the moment, the second load resistor R4 is normally connected back to the power supply, the power supply positive end VCC2 and the power supply negative end GND are restored to 9V power supply voltage, and the LED light source D1 is restored to the normal working state.
The present invention also provides a sample analyzer, as shown in fig. 7, which may include: a light source and a light source driver as in any one of the embodiments above. The light source driver is connected with the light source. Further, in use, the light source may be used to illuminate the assay sample, and the light source may be an LED or laser light source. The sample analyzer may be a sample analyzer. The sample analyzer may be a blood analyzer for performing functional analysis and testing of blood. Further, the sample analyzer may further include a photoelectric receiving portion and a photoelectric conversion portion so as to receive and convert an optical signal after irradiating the measurement sample.
In one embodiment, the light source is in a normal operating state in the case where the sample analyzer uses the light source for sample detection. When the sample analyzer stops using the light source and the stop time is not longer than the preset time, the light source is in a standby state, and after the sample analyzer finishes sample analysis work, if the time difference between the next sample analysis work distance and the current sample analysis work does not exceed the preset time, the light source can be controlled to enter the standby state, when the next sample analysis work is started, the light source directly enters a normal working state from the standby state, and after the time difference between the next sample analysis work distance and the current sample analysis work exceeds the preset time, the light source is controlled to enter the stop working state. The preset time period can be 0-24h, or can be adjusted according to application requirements. Before the sample analyzer uses the light source to detect the sample, the light source is in a standby state, and before the sample analyzer is ready to perform sample analysis work, the light source is firstly controlled to enter the standby state, and then the light source enters a normal working state from the standby state when the sample analysis work is started. The sample analyzer adopting the light source driver can not only slow down the aging of the light source, lower the power consumption and save more energy, but also can quickly enter a stable test state when the sample analysis is started, thereby improving the sample analysis efficiency and being beneficial to ensuring the accuracy and the reliability of the analysis data of the measured sample.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present invention in any way.
Claims (14)
1. A light source driver, the light source driver comprising:
the power supply is connected with the light source and used for generating a power supply voltage for supplying power to the light source; when the power supply voltage is the first voltage, the light source is in a normal working state, and when the power supply voltage is the second voltage, the light source is in a standby state;
the control part is used for sending out a first control signal when the light source is required to be in a normal working state and sending out a second control signal when the light source is required to be in a standby state; and
an execution section, connected to the control section, for controlling the power supply to output the first voltage based on the received first control signal, and controlling the power supply to output the second voltage based on the received second control signal;
the power supply is provided with a power supply positive end and a power supply negative end which output the power supply voltage;
the light source driver further includes: a load adjustment unit connected to the power supply and the execution unit; the load adjusting part and the light source are mutually connected between the positive power end and the negative power end of the power supply in parallel;
the load adjusting part is used for adjusting the load size provided by the load adjusting part according to the first control signal or the second control signal so as to adjust the power supply voltage provided by the power supply for the light source;
wherein the load adjustment portion includes at least a first load resistor between the positive power supply terminal and the negative power supply terminal;
wherein, the power supply includes: a DC-DC conversion unit;
wherein the DC-DC conversion section includes: a three-terminal voltage regulator; the input end of the three-terminal voltage stabilizer is connected with an input power supply, the adjusting end of the three-terminal voltage stabilizer is connected with the output end of the three-terminal voltage stabilizer through the first load resistor, and the output end of the three-terminal voltage stabilizer is used as the positive end of the power supply.
2. A light source driver according to claim 1, wherein the power supply stops supplying power to the light source in case the light source is required to be in a stopped state.
3. The light source driver according to claim 1, wherein the executing section controls the load adjusting section to supply a first load based on the received first control signal, and controls the load adjusting section to supply a second load based on the received second control signal.
4. A light source driver according to claim 3,
the execution unit includes: a first switch controlled by the control part; the first switch part is turned off when the control part sends the first control signal, and the first switch part is turned on when the control part sends the second control signal;
the load adjusting part is connected with the first switch part, and provides a first load when the first switch part is turned off, and provides a second load when the first switch part is turned on; the second load is lower than the first load.
5. A light source driver according to claim 4, wherein,
the load adjusting part further comprises a second load resistor, and the first load resistor and the second load resistor are mutually connected in series between the positive end of the power supply and the negative end of the power supply; the value of the first load is equal to the sum of the resistance values of the first load resistor and the second load resistor; the value of the second load is equal to the resistance value of the first load resistor;
the first switch part is provided with a first control end, a first switch end and a second switch end; the first control end is used for receiving the first control signal or the second control signal, and the second load resistor is connected between the first switch end and the second switch end in parallel.
6. The light source driver according to claim 5, wherein the first switching section includes: the first triode, the first driving resistor, the protection resistor and the protection capacitor; one end of the first driving resistor is connected to the base electrode of the first triode, and the other end of the first driving resistor is used as the first control end; the protection resistor and the protection capacitor form a parallel branch, and two ends of the parallel branch are respectively connected with the base electrode and the emitter electrode of the first triode; the second load resistor is connected between the collector and the emitter of the first triode.
7. The light source driver according to claim 5, wherein the DC-DC conversion section is configured to DC-DC convert an input power source to generate the power supply voltage.
8. A light source driver as recited in claim 1, wherein the light source driver further comprises: a current limiter for limiting a current flowing through the light source; the executing portion controls the current limiter to be connected to the power supply based on the received first control signal, and controls the current limiter not to be connected to the power supply based on the received second control signal.
9. The light source driver of claim 8, wherein the light source driver comprises,
the execution unit includes: a second switch controlled by the control part; the second switch part is turned off when the control part sends the first control signal, and is turned on when the control part sends the second control signal;
the current limiting part is connected with the second switch part, when the second switch part is turned off, the current limiting part is connected with the power supply, and when the second switch part is turned on, the current limiting part is not connected with the power supply.
10. The light source driver of claim 9, wherein the light source driver comprises,
the power supply is provided with a power supply positive end and a power supply negative end which output the power supply voltage;
the second switch part is provided with a second control end, a third switch end and a fourth switch end; the second control end is used for receiving the first control signal or the second control signal, and the current limiter is connected between the third switch end and the fourth switch end in parallel;
the current limiter comprises a current limiting resistor arranged between the positive end of the power supply and the negative end of the power supply; the current limiting resistor and the light source are mutually connected in series.
11. The light source driver according to claim 10, wherein the second switching section includes: the second triode and the second driving resistor; one end of the second driving resistor is connected to the base electrode of the second triode, and the other end of the second driving resistor is used as the second control end; the current limiter is connected between the collector and the emitter of the second triode.
12. A sample analyzer, the sample analyzer comprising:
a light source; and
the light source driver of any one of claims 1 to 11; the light source driver is connected with the light source.
13. The sample analyzer of claim 12, wherein the sample analyzer comprises a sample cell,
under the condition that the sample analyzer uses the light source to detect samples, the light source is in a normal working state;
under the condition that the sample analyzer stops using the light source and the stop time is not longer than a preset time, the light source is in a standby state;
the light source is in a standby state before the sample analyzer uses the light source for sample detection.
14. The sample analyzer of claim 12, wherein the sample analyzer comprises a sample cell,
the light source is an LED or laser light source.
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| CN113873714A (en) | 2021-12-31 |
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