CN112018596A - Radiation driving circuit, radiation driving method and radiation emitting device - Google Patents
Radiation driving circuit, radiation driving method and radiation emitting device Download PDFInfo
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- CN112018596A CN112018596A CN201910469315.3A CN201910469315A CN112018596A CN 112018596 A CN112018596 A CN 112018596A CN 201910469315 A CN201910469315 A CN 201910469315A CN 112018596 A CN112018596 A CN 112018596A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
- H01S5/0428—Electrical excitation ; Circuits therefor for applying pulses to the laser
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
Abstract
The invention provides a radiation driving circuit, a radiation driving method and a radiation emitting device, wherein the radiation driving circuit comprises: the radiation generating module and the at least two power supply modules are arranged, and the input end of the radiation generating module is connected with the output ends of the at least two power supply modules; the at least two power supply modules include: an initial power supply module for supplying a first voltage V1 as an initial voltage to the radiation generating module; the final state power supply module is used for providing a second voltage V2 to the radiation generation module so that the current of the radiation generation module is a preset threshold; the at least two power supply modules are switched to the next power supply module when a preset condition is met according to the sequence of the output voltage from high to low until the power supply modules are switched to the final state. The invention shortens the rising edge time of the radiation generating module and reduces the energy consumption at the same time.
Description
Technical Field
The invention belongs to the field of radiation driving, and particularly relates to a radiation driving circuit, a radiation driving method and a radiation emitting device.
Background
The semiconductor laser has the advantages of small volume, strong reliability, high efficiency, light weight, low price and the like, so that the semiconductor laser is widely applied to the field of photoelectronics. In recent years, semiconductor lasers have been used as light emitting sources in fields such as laser ranging, laser detection and target identification.
In practical application, higher and higher requirements are put forward on the rising edge time of the laser pulse, and the pulse width and the rising edge of the laser pulse are generally required to be narrow and fast in order to obtain good application effect. Particularly, in a laser radar ranging system, the distance needs to be determined by combining the time difference between the emission of laser pulses and the echo and the propagation speed of light, and the longer the rise time is, the larger the introduced time error is, so that the measurement error is directly caused, and the accuracy of laser radar ranging is reduced.
The rising edge time of the laser pulse depends mainly on the performance of the driving circuit. At present, in order to obtain laser pulse with a fast rising edge, a capacitor is mostly adopted as an energy storage device, the capacitor is charged to power voltage firstly, and then the capacitor discharges to supply the power voltage to a laser so as to generate transient large current. However, a parasitic inductance, usually several tens nH, inevitably exists in the drive path, and even if the packaging method of the laser is optimized by rational wiring, the parasitic inductance is still high, and cannot meet the requirement of high precision.
In the prior art, in order to increase the rising speed of current flowing through a laser, a resistor is additionally arranged in a power supply loop of the laser, and the power supply voltage is increased by utilizing the voltage division effect of the resistor during the working of the laser. When the laser is started, the current is very small, and the voltage division U on the resistorRIR is so small that at the moment of switching-on almost the full supply voltage is applied to the parasitic inductor and the laser, as a result of the relationship U between the inductor current and the voltage across the inductorLKnown as L (di/dt), ULThe higher the current change speed will be, the larger the current change speed will be, thereby achieving fast light emission and obtaining a steep rising edge.
However, according to P ═ I2R indicates that the power consumption of the driving circuit is additionally increased due to the existence of the current limiting resistor, and especially for a high-power laser, the power consumption is particularly serious due to the large current.
Therefore, it is highly desirable to design a driving scheme with low power consumption that can increase the current rise speed.
Disclosure of Invention
Aiming at the defects in the prior art, the embodiment of the invention provides a radiation driving circuit, a radiation driving method and a radiation emitting device, and aims to solve the technical problem that a pulse signal with high rising speed and low power consumption cannot be obtained in the prior art.
In order to solve the technical problem, the application adopts the following technical scheme:
in a first aspect of embodiments of the present invention, there is provided a radiation driving circuit comprising a radiation generating module and at least two power supply modules. The input end of the radiation generation module is connected with the output ends of the at least two power supply modules. The at least two power supply modules include: an initial power supply module for supplying a first voltage V1 as an initial voltage to the radiation generating module; the final state power supply module is used for providing a second voltage V2 to the radiation generation module so that the current of the radiation generation module is a preset threshold; and the at least two power supply modules are switched to the next power supply module when a preset condition is met according to the sequence of the output voltage from high to low until the power supply module is switched to the final state.
In an embodiment of the present invention, the initial power supply module includes a driving unit and a first energy storage unit, and a first end of the first energy storage unit is connected to an output end of the driving unit and an input end of the radiation generation module, respectively.
In one embodiment of the present invention, the driving unit includes a first power source and a first switch, and the first power source is connected to the first end of the first energy storage unit through the first switch.
In one embodiment of the invention, the final state power supply module comprises a second power supply and a second energy storage unit. The first end of the second energy storage unit is respectively connected with the output end of the second power supply and the input end of the radiation generation module.
In an embodiment of the invention, the final-state power supply module further includes a second switch, which is disposed between a common terminal of the second energy storage unit and the second power supply and the input terminal of the radiation generation module.
In an embodiment of the invention, the final-state power supply module further includes a self-adaptive conducting unit, which is disposed between the second energy storage unit and the common terminal of the second power supply, and the input terminal of the radiation generation module, and is configured to conduct automatically when a preset condition is met.
In an embodiment of the present invention, when a preset condition is satisfied, switching to a next power supply module is specifically configured to: if the current voltage of the radiation generation module is equal to the output voltage of the next power supply module, switching to the next power supply module to supply power to the radiation generation module; or switching to the next power supply module to supply power to the radiation generation module based on the preset time sequence.
In one embodiment of the present invention, the radiation generating module is grounded through a third switch; wherein the radiation generating module comprises at least one radiation generating unit.
In a second aspect of embodiments of the present invention, there is provided a radiation driving method applied to the radiation driving circuit according to any one of the first aspects, including:
providing a first voltage V1 as an initial voltage to the radiation generating module; judging whether a preset condition is met;
if the output voltage is satisfied, switching to the next power supply module to provide voltage for the radiation generation module according to the sequence of the output voltage from high to low; and circularly judging whether the preset condition is met, switching to the next power supply module when the preset condition is met, and stopping switching until the final power supply module is switched.
In an embodiment of the present invention, before providing the first voltage V1 as the initial voltage to the radiation generating module, the method further includes: the first energy storage unit is charged to a first voltage V1 with a pulse signal of a preset period, for providing the first voltage V1 as an initial voltage to the radiation generating module.
In an embodiment of the present invention, before providing the first voltage V1 as the initial voltage to the radiation generating module, the method further includes: the first switch is closed to charge the first energy storage unit to the first voltage V1 through the first power supply for providing the first voltage V1 as the initial voltage to the radiation generating module.
In one embodiment of the invention, the third switch is closed to provide the first voltage V1 as an initial voltage to the radiation generating module through the first energy storage unit.
In an embodiment of the present invention, before providing the second voltage V2 to the radiation generating module, the method further includes: the second energy storage unit is charged by a second power supply for providing a second voltage V2 to the radiation generating module.
In one embodiment of the present invention, when the preset condition is satisfied, the second switch is closed, so that the second energy storage unit provides the second voltage V2 to the radiation generating module.
In one embodiment of the present invention, the states of the first switch, the second switch, and the third switch are controlled based on a preset timing, or based on detection of a current or a voltage in the circuit.
In an embodiment of the present invention, switching to a next power supply module to provide a voltage to the radiation generating module when a preset condition is met includes: when the current voltage of the radiation generation module is equal to the output voltage of the next power supply module, switching to the next power supply module to provide voltage for the radiation generation module; or switching to the next power supply module based on the preset time sequence to provide the voltage for the radiation generation module.
In a third aspect of an embodiment of the present invention, at least one radiation driving circuit as in any of the first aspect is comprised.
According to the invention, at least two power supply modules are sequentially switched from high to low in output voltage, so that the radiation generation module is rapidly started at high voltage to obtain a steep rising edge; finally, the power supply module is switched to the final state to maintain the current required by the normal work of the radiation generation module, and the use of a current limiting resistor is avoided, so that the power supply module has lower power consumption in the working process.
Drawings
Fig. 1 is a schematic structural diagram of a radiation driving circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an alternative radiation driving circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an alternative radiation driving circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an alternative radiation driving circuit according to an embodiment of the present invention;
FIG. 5 is a flow chart of an alternative radiation driving method of an embodiment of the present invention;
FIG. 6a is a radiation driven simulation according to the prior art;
fig. 6b is an alternative radiation driven simulation of an embodiment of the present invention.
Detailed Description
The principles and spirit of the present invention will be described with reference to a number of exemplary embodiments, it being understood that the described embodiments are only a few, but not all, embodiments of the present invention. It is understood that these embodiments are given solely for the purpose of enabling those skilled in the art to better understand and to practice the invention, and are not intended to limit the scope of the invention in any way. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. 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.
It will be understood that when an element/module is referred to as being "connected," it can be directly connected to the other element/module or intervening elements/modules may be present. In contrast, when units/modules are said to be "directly connected," there are no intervening units/modules.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein.
In the prior radiation driving circuit, the rising edge time is limited to be long when the circuit is started, so that the radiation source driven by the circuit has adverse effect on the application. For example, when a laser, an LED or an electromagnetic wave is used as a radiation source of the distance measuring device, a long rise time may cause a decrease in the distance measuring accuracy,
in order to shorten the rising edge time during startup, embodiments of the present invention provide a radiation driving circuit, a radiation driving method, and a radiation emitting device. The radiation driving circuit, the radiation driving method and the radiation emitting device are based on the same inventive concept, and because the principles for solving the problems are similar, the implementation of the radiation driving circuit, the radiation driving method and the radiation emitting device can be referred to each other, and repeated parts are not described again.
An embodiment of the present invention shown in fig. 1 provides a radiation driving circuit, which includes: the device comprises a radiation generation module and at least two power supply modules; the input end of the radiation generation module is connected with the output ends of at least two power supply modules; the at least two power supply modules include: an initial power supply module for supplying a first voltage V1 as an initial voltage to the radiation generating module; the final state power supply module is used for providing a second voltage V2 to the radiation generation module so that the current of the radiation generation module is a preset threshold; and the at least two power supply modules are switched to the next power supply module when a preset condition is met according to the sequence of the output voltage from high to low until the power supply modules are switched to the final state.
By adopting the embodiment of the invention, the radiation generation module can be started by the initial power supply module at high voltage, the initial power supply module is conducted to load the high voltage on the parasitic inductor and the radiation generation module, and the relation U between the inductor current and the voltage at two ends of the inductor is usedLAs can be seen from L (di/dt), the higher the applied voltage UL, the higher the current change speed, so that fast light emission is achieved and a steep rising edge is obtained. When the voltage of the radiation generation module is equal to the output voltage of the final-state power supply module, the radiation generation module is switched to the final-state power supply module to provide the required voltage, the radiation generation module is maintained to work under the current required by normal work, the current-limiting resistance mode adopted in the prior art is avoided, and the energy consumption can be reduced.
The radiation driving circuit provided by the embodiment of the invention can be applied to a radiation emitting device, and particularly can be applied to the radiation emitting device in various fields such as high-precision distance measurement and high-frame-rate imaging.
The radiation generating module related to the embodiment of the invention is used for generating radiation based on input electric energy, can be an electro-optical conversion device or a combination thereof, and converts the input electric energy into light, such as devices such as a laser diode and an LED; or an electromagnetic conversion device or a combination thereof, and converts the input electric energy into electromagnetic waves, for example, converts the input electric energy into millimeter waves.
The drive current of the radiation generation module is I when the radiation generation module works normallyDRadiation product of the present embodimentThe preset threshold value of the current of the generating module is greater than or equal to 0.7IDAnd is less than or equal to 1.1IDFor example, it can be preset to 0.8IDOr 0.9IDWherein is preferably ID。
It should be noted that the preset condition includes that the output voltage of the current power supply module is equal to the voltage provided by the next power supply module. The voltage provided by the next power supply module refers to an initial voltage output by the next power supply module when the voltage provided by the next power supply module is changed.
In one possible implementation manner, the power supply module includes i power supply modules, output voltages of which are sequentially reduced from the initial power supply module to the final power supply module, where i is a positive integer greater than or equal to 2. When i is equal to 2, namely the power supply module comprises an initial power supply module and a final power supply module, the initial power supply module provides a first voltage V1 to start the radiation generation module, and when the voltage of the radiation generation module is equal to the output voltage of the final power supply module, the output voltage is switched to be output by the final power supply module, so that the current of the radiation generation module is maintained at a preset threshold value.
When i is greater than 2, i-2 intermediate power supply modules with sequentially reduced output voltages are arranged between the initial power supply module and the final state power supply module, the initial power supply module is connected with the radiation generation module, a first voltage V1 is provided to start the radiation generation module, when the output voltage of the radiation generation module is equal to the output voltage of the next power supply module, the next power supply module is switched to output the voltage to the radiation generation module, and the like are carried out until the last final state power supply module is switched on to output the voltage to the radiation generation module, so that the current of the radiation generation module is maintained at a preset threshold value.
It should be noted that, the power supply modules are sequentially turned on from high to low of the output voltage, regardless of the position sequence.
In one embodiment of the present invention, the initial power supply module includes a driving unit and a first energy storage unit, as shown in fig. 2.
The first end of the first energy storage unit is respectively connected with the output end of the driving unit and the input end of the radiation generation module. The driving unit is used for charging the first energy storage unit; the first energy storage unit is used for supplying electric energy to the radiation generation module.
It should be understood that, in the process of supplying the electric energy to the radiation generating module by the first energy storage unit, the driving unit may continuously charge the first energy storage unit; the driving unit may stop charging the first energy storage unit before the first energy storage unit provides the electric energy to the radiation generating module.
In order to prevent the excessive voltage variation from causing the instability of the circuit and the insecurity of the radiation generating module when switching to the final-state power supply module, it is preferable that the driving unit stops charging the first energy storage unit before supplying the electric energy to the radiation generating module.
On the basis of the above embodiments, the driving unit further includes a first power supply and a first switch S1, where the first power supply is connected to the first end of the first energy storage unit through the first switch. The first switch S1 is configured to charge the first energy storage unit to a first voltage V1 through the first power source after the first switch S1 is closed, and to turn off the first switch S1 to stop charging the first energy storage unit before the third switch is turned on, that is, before the first energy storage unit provides power to the radiation generating module.
With the above embodiment of the present invention, since the first energy storage unit stops charging before supplying power to the radiation generating module, as the first energy storage unit supplies power to the radiation generating module, the voltage at the first end of the radiation generating module gradually decreases, so that the voltage change when the power supply module is switched to the final state for supplying power is small, and even seamless connection can be achieved, that is, when the voltage value at the first end of the radiation generating module decreases from the first voltage V1 to the second voltage V2, the power supply module is switched to the final state for supplying power to the radiation generating module.
Specifically, the first switch S1 according to the above embodiments may be a P-type or N-type MOS transistor, and is preferably a P-type MOS transistor; the first energy storage unit may be a capacitor C1, as shown in fig. 3 and 4, a first end of the capacitor C1 is connected to the output end of the driving unit and the input end of the radiation generating module, respectively, and a second end of the capacitor C1 is grounded.
Optionally, an embodiment of the present invention further provides another optional scheme, where the driving unit controls to charge the first energy storage unit based on a preset time sequence, or charges the first energy storage unit with pulses of a preset period.
It should be noted that the pulse of the preset period of the driving unit is at a low level when the first energy storage unit supplies power to the radiation generating module, and emits a high level to complete charging during the period when no power is supplied. In this way, the voltage provided by the first energy storage unit is gradually reduced along with the discharging, and in this way, a large voltage change can be avoided when the power supply module is switched to the final state.
In an embodiment of the present invention, on the basis of the above embodiment, the final-state power supply module further includes a second power supply and a second energy storage unit. The first end of the second energy storage unit is respectively connected with the output end of the second power supply and the input end of the radiation generation module, and is used for providing voltage for the radiation generation module when the voltage of the radiation generation module is the output voltage of the final-state power supply module.
Optionally, in the above embodiment of the present invention, the final-state power supply module further includes a second switch S2, as shown in fig. 3 and 4, the second switch S2 is disposed between the first end of the second energy storage unit and the input end of the radiation generating module, and is configured to be closed when the voltage of the radiation generating module is the output voltage of the final-state power supply module.
Optionally, in another embodiment provided by the present invention, the final-state power supply module includes an adaptive turn-on module, configured to turn on automatically when the radiation generating module voltage is the output voltage of the final-state power supply module, and the adaptive turn-on module may adopt a diode, a triode, or another device having two states of turn-off and turn-on according to voltage variation between two terminals. As shown in fig. 4, taking a diode as an example, the diode is disposed between the first end of the second energy storage unit and the input end of the radiation generating module, and is configured to be turned on when the current of the radiation generating module is a preset threshold.
Specifically, the anode of the diode is connected to the first end of the second energy storage unit, and the cathode of the diode is connected to the radiation generation module. When the power supply module is started, the initial voltage of the capacitor C1 is higher than the voltage of the capacitor C2 due to the fact that the initial voltage of the capacitor C1 is higher than the voltage of the capacitor C2, and the diode is in a reverse cut-off state. As the capacitor C1 discharges, its voltage gradually decreases, and when the voltage of C1, i.e., the voltage value at the input of the radiation generating module, decreases to the output voltage of the final-state power supply module, the diode conducts forward, thereby switching the power supply module to the final-state power supply module. The embodiment of the invention can perform self-adaptive switching of the two power supply modules by utilizing the reverse cut-off characteristic of the diode, realizes seamless connection of voltage when the two power supply modules are switched, and has simple circuit structure and easy operation.
The first switch S1 according to the above embodiments may be a P-type or N-type MOS transistor, and is preferably a P-type MOS transistor; the second energy storage unit may be a capacitor, as shown in fig. 3 and 4, a first terminal of the capacitor C2 serves as a first terminal of the second energy storage unit, and a second terminal of the capacitor C2 is grounded.
Optionally, in the above embodiment, the second voltage V2 is a voltage value corresponding to the first end of the radiation generating module when the current of the radiation generating module is the preset threshold. When the preset threshold value of the radiation generation module current is set as the driving current I when the radiation generation module normally worksDAnd then, seamless switching of the two circuit modules can be realized.
Optionally, the radiation generating module in the above embodiments includes one or more radiation generating units, and when a plurality of radiation generating units are included, the radiation generating units may be connected in various manners, for example, when two radiation generating units are included, the two radiation generating units are connected in series or in parallel; when at least three radiation generating units are included, the radiation generating units are connected in series and/or parallel.
It should be noted that the radiation generating module is grounded through the third switch S3, as shown in fig. 3 and 4. The third switch S3 is closed when the radiation generating module is in operation, forming a path. The inductance L shown in fig. 3 and 4 is an equivalent parasitic inductance in the circuit, and is shown for the convenience of understanding the generation of the technical problem.
Specifically, the radiation generating unit may be an electro-optical conversion device, which converts input electrical energy into light, such as a laser diode and an LED; or an electromagnetic conversion device, which converts the input electric energy into electromagnetic waves, for example, into millimeter waves. The third switch S3 may be a P-type or N-type MOS transistor, and is preferably an N-type MOS transistor.
It should be noted that the switching states of the first switch S1, the second switch S2, and the third switch S3 may be controlled based on a preset timing, or may be controlled based on direct or indirect detection of current or voltage in the circuit of the present invention. If the opening and closing states of the first switch S1, the second switch S2 and the third switch S3 can be controlled based on the detection of the voltage of the first energy storage unit, the first switch S1 is controlled to be opened when the first voltage V1 is reached, and the third switch is controlled to be closed; when the voltage of the first energy storage unit drops to the second voltage V2, the second switch S2 is controlled to be closed. The direct or indirect detection method of the voltage can adopt any one or more schemes in the prior art, and the details are not repeated here.
Referring to fig. 3, an alternative embodiment of the present invention will be described in detail, where the initial power supply module includes a first power supply, a first switch S1, a capacitor C1, and a switch S12, a first end of the capacitor C1 is connected to the first power supply through the first switch S1, and the first end is also connected to the radiation generating module through the switch S12; the second terminal of the capacitor C1 is connected to ground. The final state power supply module comprises a second power supply, a second switch S2 and a capacitor C2, wherein a first end of the capacitor C2 is connected with the second power supply and is simultaneously connected with the radiation generating module through the second switch S2. The radiation generating module comprises a laser diode D2 and a third switch S3, the anode of the laser diode D2 intersects the initial power supply module and the final power supply module at a node A, and the cathode of the laser diode D2 is grounded through the third switch S3. The inductance L shown in fig. 3 is an equivalent parasitic inductance of the circuit. In this embodiment, P-type MOS transistors are used for the first switch S1 and the second switch S2, and N-type MOS transistors are used for the third switch S3.
On the basis of the above embodiment, the radiation driving circuit further includes a third power supply module including a third power supply, a switch S31, a capacitor C3 and a switch S32, wherein one end of the capacitor C3 is grounded, and the other end is connected to the third power supply through the switch S31 and is connected to the radiation generating module through the switch S32. The charged voltage V3 of the capacitor C3 is between the first voltage and the second voltage.
The working process of the embodiment is as follows:
s401, the first switch S1 is closed to charge the capacitor C1 to a first voltage V1, and the switch S31 is closed to charge the capacitor C3 to a voltage V3 from the third power supply;
s402, opening the first switch S1, closing the switch S12 and the third switch S3, and starting the laser diode D2 by the initial power supply module;
s403, when the voltage at the input end of the radiation generation module is equal to the voltage V3, turning off the switch S31 and the switch S12, closing the switch S32, and supplying power to the radiation generation module by the third power supply module;
and S404, when the voltage at the input end of the radiation generation module is equal to the second voltage V2, closing a second switch S2, and switching to a final state power supply module to supply power to the laser diode.
Since the second power supply voltage is dependent on the selected laser diode D2 when the circuit configuration is determined, the second voltage is a determined value in this embodiment, corresponding to the voltage value at the input terminal when the laser diode reaches the current required for normal operation. Therefore, in step 402, in actual operation, a switching action may be performed according to the voltage at the input terminal of the laser diode D2.
In a specific embodiment, the power supply modules include a start power supply module and a final power supply module, the first power supply voltage is 30V, the second power supply voltage is 6V, the capacitor C1 is charged first before the laser diode D2 is activated, and the first switch S1 is opened to stop charging before the third switch S3 is closed. When the third switch S3 is closed, the voltage across the capacitor C1 decreases with the discharge process, and when it decreases to 6V, the second switch S2 is closed to freewheel the laser. Therefore, the scheme that parasitic inductance is charged at high voltage and laser diode freewheeling is performed at low voltage is realized.
In the embodiment shown in fig. 4, the power supply module includes a start power supply module and a final power supply module, in which the second switch S2 is replaced by a diode D1, the anode of the diode D1 is connected to the second power supply, the cathode is connected to the laser diode D2, and the diode D1 is used to cut off the power supply in the reverse directionThe characteristic of (a) is maintained in an off state when the initial power module is powered at a high voltage, but is adaptively turned on when the voltage drops to a second voltage. At this time, if the voltage outputted from the final power supply module to the radiation generating module is the second voltage V2, the voltage of the capacitor C2 is actually set to V2+ V if the voltage drop of the diode is consideredD1In which V isD1Is the voltage drop of the diode.
The present invention further provides a radiation-driven method embodiment based on the above-described embodiment, it should be noted that the steps shown in the flowchart of the drawings may be executed in a computer system such as a set of computer-executable instructions, and that although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in an order different from the order shown.
Fig. 5 is a radiation driving method according to an embodiment of the present invention, including the steps of:
step S501, providing a first voltage V1 as an initial voltage to the radiation generation module;
step S502, judging whether a preset condition is met;
step S503, if yes, switching to the next power supply module to provide voltage for the radiation generation module according to the sequence of the output voltage from high to low;
and circularly judging whether the preset condition is met, and switching to the next power supply module when the preset condition is met, and stopping switching until the final power supply module is switched.
By adopting the embodiment of the invention, the parasitic inductor L and the radiation generation module can be loaded with a higher first voltage V1, so that the current is rapidly increased, and a steep rising edge is obtained; when the voltage of the radiation generation module is reduced to the voltage provided by the next power supply module, the next power supply module is switched to supply power, otherwise, the current power supply module is continuously kept to supply power until the voltage provided by the next power supply module is switched to meet the conditions, and the process is repeated until the power supply module is switched to the final state and the lower second voltage V2 is used as follow current of the radiation generation module.
The drive current of the radiation generation module is I when the radiation generation module works normallyDThe preset threshold of the current of the radiation generating module in this embodiment is greater than or equal to 0.7IDAnd is less than or equal to 1.1IDWherein is preferably ID。
As an alternative embodiment, before the first voltage V1 is used as the initial voltage to supply the electric energy to the radiation generating module, the method further includes charging the first energy storage unit to the first voltage V1 by the driving unit; the first end of the first energy storage unit is respectively connected with the input ends of the driving unit and the radiation generation module and used for providing electric energy for the radiation generation module. During the period that the first energy storage unit supplies power to the radiation generation module, the driving unit can keep continuously charging the first energy storage unit, and can also stop charging.
In order to avoid abrupt voltage changes when switching from the initial power supply module to the final power supply module, on the basis of the above-described embodiment, the first energy storage unit is charged to the first voltage V1 by the first power supply by closing the first switch S1, and the first switch S1 is opened to stop charging the first energy storage unit before the first energy storage unit supplies power to the radiation generating module; the first power supply is connected to the first end of the first energy storage unit through a first switch S1.
With the above embodiment of the present invention, since the first energy storage unit stops charging before supplying power to the radiation generating module, as the first energy storage unit supplies power to the radiation generating module, the voltage at the first end of the radiation generating module gradually decreases, so that the voltage change when the power supply module is switched to the final state for supplying power is small, and even seamless connection can be achieved, that is, when the voltage value at the first end of the radiation generating module decreases from the first voltage V1 to the second voltage V2, the power supply module is switched to the final state for supplying power to the radiation generating module.
As an alternative embodiment, in addition to controlling the driving unit to charge the first energy storage unit based on the preset timing, the driving unit having a preset periodic pulse may also be used to charge the first energy storage unit. The driving unit presets a periodic pulse, is at a low level when the first energy storage unit provides electric energy for the radiation generation module, and transmits a high level to finish charging during the period of no electric energy. In this way, it is likewise possible to avoid large voltage changes when switching to the final power supply module.
As an optional implementation manner, when it is determined that the preset condition is reached, switching to providing the electric energy to the radiation generating module at the second voltage V2 specifically includes: charging the second energy storage unit to a second voltage V2 through the second power supply; when the voltage of the radiation generation module is judged to be equal to the second voltage V2, the second energy storage unit is controlled to provide electric energy for the radiation generation module; the first end of the second energy storage unit is connected with the second power supply and the input end of the radiation generation module respectively. Since the second voltage V2 is used for providing current when the radiation generating module operates normally, and is therefore preferably output as a constant current, the second power supply continuously charges the second energy storage unit during the period that the second energy storage unit supplies power to the radiation generating module, so as to maintain the constant second voltage V2, thereby obtaining a constant current output. In addition, the second energy storage unit can also play a role in filtering, and damage to the rear-stage radiation generation module when the power supply voltage is unstable is avoided.
As an optional implementation manner, when it is determined that the preset condition is met, the second energy storage unit is controlled to provide electric energy to the radiation generation module, which specifically includes: when the voltage of the radiation generation module is judged to be equal to the output voltage of the second energy storage unit, the second switch is closed to enable the second energy storage unit to provide electric energy for the radiation generation module; the second switch is arranged at the first end of the second energy storage unit and the input end of the radiation generation module.
As an optional implementation manner, when it is determined that the current of the radiation generating module is the preset threshold, the second energy storage unit is controlled to provide electric energy to the radiation generating module, which specifically includes: the first end of the second energy storage unit and the radiation generation module are connected through a self-adaptive conduction module such as a diode, and the diode is conducted when the current of the radiation generation module is a preset threshold value. The anode of the diode is connected with the first end of the second energy storage unit, and the cathode of the diode is connected with the radiation generation module. When the power supply module is started, the diode is in a reverse cut-off state because the initial voltage of the first energy storage unit is the first voltage V1 and is higher than the second voltage V2 of the second energy storage unit. When the voltage of the first energy storage unit, i.e. the voltage value at the input terminal of the radiation generating module, drops to V2, the diode conducts in the forward direction, so as to switch the power supply module to the final power supply module. The embodiment of the invention can perform self-adaptive switching of the two power supply modules by utilizing the reverse cut-off characteristic of the diode, realizes seamless connection of voltage when the two power supply modules are switched, and has simple circuit structure and easy operation.
As an optional implementation manner, the second voltage V2 is a voltage value corresponding to the first end of the radiation generating module when the current of the radiation generating module is a preset threshold. Thereby, seamless switching of the two circuit modules can be realized.
As an alternative embodiment, the radiation generating module generates radiation based on the provided electrical energy, including generating radiation by one or more radiation generating units; when the two radiation generating units generate radiation, the two radiation generating units are connected in series or in parallel; or, when the radiation is generated by at least three radiation generating units, the at least three radiation generating units are connected in series and/or parallel.
Embodiments of the present invention also provide a radiation emitting device, where the radiation emitting device includes at least one radiation driving circuit shown in fig. 1, or the radiation emitting device includes at least one radiation driving circuit shown in fig. 2, or the radiation emitting device includes at least one radiation driving circuit shown in fig. 3, or the radiation emitting device includes at least one radiation driving circuit shown in fig. 4.
Through simulation of an embodiment of the present invention, it is found that 4.76ns is required to raise the current from 0A to 5.79A using the prior art as shown in fig. 6 a; by adopting the scheme of the embodiment of the invention, when the first power supply is 30V and the second voltage is 6V, the current needs 1.39ns to rise from 0A to 5.79A as shown in FIG. 6b, so that the current rising speed is greatly increased and a steep rising edge is obtained.
Claims (10)
1. A radiation driving circuit, comprising: the device comprises a radiation generation module and at least two power supply modules; the input end of the radiation generation module is connected with the output ends of the at least two power supply modules;
the at least two power supply modules include: an initial power supply module for supplying a first voltage V1 as an initial voltage to the radiation generation module; the final state power supply module is used for supplying a second voltage V2 to the radiation generation module so that the current of the radiation generation module is a preset threshold; wherein the content of the first and second substances,
and the at least two power supply modules are switched to the next power supply module when a preset condition is met according to the sequence of the output voltage from high to low until the power supply modules are switched to the final state.
2. The circuit of claim 1, wherein the initial power module comprises a driving unit and a first energy storage unit;
the first end of the first energy storage unit is respectively connected with the output end of the driving unit and the input end of the radiation generation module.
3. The circuit of claim 2, wherein the driving unit comprises a first power source and a first switch, and the first power source is connected to the first end of the first energy storage unit through the first switch.
4. The circuit according to any one of claims 1 to 3, wherein the final state power supply module comprises a second power supply and a second energy storage unit;
and the first end of the second energy storage unit is respectively connected with the output end of the second power supply and the input end of the radiation generation module.
5. The circuit of claim 4, wherein the final power supply module further comprises a second switch disposed between a common terminal of the second energy storage unit and the second power source and the input terminal of the radiation generating module.
6. The circuit of claim 4, wherein the final power supply module further comprises a self-adaptive conducting unit, disposed between a common terminal of the second energy storage unit and the second power supply and the input terminal of the radiation generation module, for automatically conducting when the preset condition is met.
7. A radiation driving method applied to the radiation driving circuit according to any one of claims 1 to 6, comprising:
providing a first voltage V1 as an initial voltage to the radiation generating module;
judging whether a preset condition is met;
if the output voltage is satisfied, switching to the next power supply module to provide voltage for the radiation generation module according to the sequence of the output voltage from high to low;
and circularly judging whether preset conditions are met or not, switching to the next power supply module when the preset conditions are met, and stopping switching until the final power supply module is switched.
8. The method of claim 7, wherein before providing the first voltage V1 as the initial voltage to the radiation generating module, further comprising:
the first switch is closed to charge the first energy storage unit to a first voltage V1 through the first power supply for providing the first voltage V1 as an initial voltage to the radiation generating module.
9. The method of claim 7, wherein before providing the second voltage V2 to the radiation generating module, further comprising:
the second energy storage unit is charged by the second power supply for providing a second voltage V2 to the radiation generating module.
10. A radiation emitting device comprising a radiation driving circuit as claimed in any one of claims 1 to 6.
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| CN201910469315.3A CN112018596A (en) | 2019-05-31 | 2019-05-31 | Radiation driving circuit, radiation driving method and radiation emitting device |
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| US20010043093A1 (en) * | 2000-05-16 | 2001-11-22 | Shigeyuki Sakura | Led driving circuit and optical transmitting module |
| CN1928969A (en) * | 2005-09-09 | 2007-03-14 | 富士通日立等离子显示器股份有限公司 | Plasma display device and method of driving the same |
| US20190025406A1 (en) * | 2015-08-13 | 2019-01-24 | Brightway Vision Ltd. | Pulsed light illuminator for various uses |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010043093A1 (en) * | 2000-05-16 | 2001-11-22 | Shigeyuki Sakura | Led driving circuit and optical transmitting module |
| CN1928969A (en) * | 2005-09-09 | 2007-03-14 | 富士通日立等离子显示器股份有限公司 | Plasma display device and method of driving the same |
| US20190025406A1 (en) * | 2015-08-13 | 2019-01-24 | Brightway Vision Ltd. | Pulsed light illuminator for various uses |
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Application publication date: 20201201 |