CN210468374U - Pulse solid laser power supply - Google Patents
Pulse solid laser power supply Download PDFInfo
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- CN210468374U CN210468374U CN201921561257.9U CN201921561257U CN210468374U CN 210468374 U CN210468374 U CN 210468374U CN 201921561257 U CN201921561257 U CN 201921561257U CN 210468374 U CN210468374 U CN 210468374U
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Abstract
The utility model discloses a pulse solid laser power, including drive circuit, sampling circuit, MCU module and control circuit. The driving circuit converts the input current; the sampling circuit outputs the current converted by the driving circuit and samples the current converted by the driving circuit; the MCU module outputs SPWM waveform based on the converted current and controls the on/off of the control circuit; the control circuit controls the on or off of the driving circuit based on the received SPWM waveform signal, and finally the purpose of stably outputting the required large and small currents is achieved. The utility model provides a laser instrument power, simple structure adopts the SPWM technique, and the harmonic is little, and power live time is long, and high to the utilization ratio of electric energy, and power efficiency is high.
Description
Technical Field
The utility model belongs to the technical field of laser instrument power technique and specifically relates to a pulse solid laser power is related to.
Background
The solid laser is a laser using a solid laser material as a working substance, and the working medium is a crystal or glass as a host material into which a small amount of active ions are uniformly doped. The solid laser has the characteristics of small volume, convenient use and high output power. The continuous power of the solid laser is generally more than 100 watts, and the pulse peak power can be as high as 109W。
The laser power supply, as an electrical pump source for generating laser energy, is one of the most important technical equipment in the laser device, and is an important factor for determining the overall performance of the laser. The laser power supply chops a dc voltage mainly by a switching element to output a required current.
A common laser power supply driven by Pulse Width Modulation (PWM) has large harmonic, and a switching element has large impact, which affects the service life. And the laser power supply driven by PWM has the advantages of insufficient utilization of electric energy and low electric energy efficiency.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a pulse solid laser power, this laser power harmonic is little, long service life, and the electric energy is efficient.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a pulsed solid state laser power supply comprising: the device comprises a driving circuit, a sampling circuit, an MCU module and a control circuit;
the output end of the driving circuit is electrically connected with the sampling circuit;
the output end of the sampling circuit is electrically connected with the input end of the MCU module;
the output end of the MCU module is electrically connected with the input end of the control circuit;
the output end of the control circuit is electrically connected with the driving circuit.
As a further aspect of the present invention: the transformer also comprises a main transformer and an auxiliary transformer;
the main transformer and the auxiliary transformer are electrically connected;
the output end of the driving circuit is electrically connected with the main transformer and the auxiliary transformer respectively;
the input end of the sampling circuit is connected with the main transformer;
and the output end of the control circuit is electrically connected with the auxiliary transformer.
As a further aspect of the present invention: the switching-on and switching-off frequency of the driving circuit is between 10KHz and 150 KHz.
As a further aspect of the present invention: and the MCU module outputs two SPWM waveforms with mutually exclusive waveforms.
As a further aspect of the present invention: the MCU module also comprises an error proportional amplification circuit.
As a further aspect of the present invention: the control circuit comprises at least two transistors, and the two transistors are respectively connected with the two SPWM outputs of the MCU module.
As a further aspect of the present invention: the driving circuit comprises two transistors which are respectively connected with the two transistors of the control circuit through auxiliary transformers.
As a further aspect of the present invention: the sampling circuit comprises a rectifier diode, a filter inductor, a filter capacitor and a current sampling sensor;
the output end of the rectifier diode is sequentially connected with a filter inductor and a filter capacitor, and the filter capacitor is connected with the positive end of the laser;
the output end of the main transformer is connected with the current sampling sensor, and the current sampling sensor is connected with the negative end of the laser.
As a further aspect of the present invention: a switch is arranged between the driving circuit and the auxiliary transformer.
As a further aspect of the present invention: the switch is any one of a mechanical switch or a transistor.
The utility model has the advantages of but not limited to:
(1) the utility model provides a pulse solid laser power, including drive circuit, sampling circuit, MCU module and control circuit. The driving circuit converts the input current; the sampling circuit outputs the current converted by the driving circuit and samples the current converted by the driving circuit; the MCU module outputs SPWM waveform based on the converted current and controls the on/off of the control circuit; the control circuit controls the on or off of the driving circuit based on the received SPWM waveform signal, and finally the purpose of stably outputting the required large and small currents is achieved. The utility model provides a laser instrument power, simple structure adopts the SPWM technique, and the harmonic is little, and power live time is long, and high to the utilization ratio of electric energy, and power efficiency is high.
(2) Furthermore, the utility model also comprises a main transformer and an auxiliary transformer, wherein the main transformer is electrically connected with the auxiliary transformer; the output end of the driving circuit is electrically connected with the main transformer and the auxiliary transformer to realize the transformation of the current of the main transformer; the input end of the sampling circuit is connected with the main transformer, outputs the current transformed by the main transformer and samples the transformed current; the output end of the control circuit is electrically connected with the auxiliary transformer, and the auxiliary transformer is controlled to be switched on or switched off based on the received SPWM waveform signal. In addition, the MCU module outputs two SPWM waveforms with mutually exclusive waveforms. The sampling circuit collects current signals in the circuit, the MCU module outputs two SPWM waveforms according to the received current signals, the transistors in the control circuit are controlled to be conducted alternately, and then the transistors in the driving circuit are controlled to be conducted alternately, so that conversion from direct current to alternating current is realized. On the other hand, the two SPWM waveforms control the conduction time of the transistor in the control circuit, so that the conduction time of the transistor in the driving circuit is controlled, and rapid constant current control is realized.
(3) For traditional pulse width modulation driven laser instrument power, the utility model provides a pulse solid laser instrument power, through switching-on and the on-time of transform auxiliary transformer, the size and the direction of regulating current, the electric current harmonic is little, and the impact that switching element received is little, long service life, and through the frequency that control drive circuit switched on and cut to, the heat loss is few, and the electric energy availability factor is high.
Drawings
Fig. 1 is a schematic structural diagram of a pulse solid-state laser power supply provided by the present invention;
fig. 2 is a circuit diagram of a driving circuit, an auxiliary transformer and a main transformer according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a sampling circuit provided by an embodiment of the present invention;
fig. 4 is a circuit diagram of a control circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to the following examples, but the present invention is not limited to these examples.
Fig. 1 is a schematic diagram of a power supply flow of a pulsed solid-state laser provided in the present application, as shown in fig. 1, including: the device comprises a driving circuit, a sampling circuit, an MCU (micro control unit) module and a control circuit;
the output end of the driving circuit is electrically connected with the sampling circuit and is used for converting the input current;
the output end of the sampling circuit is electrically connected with the input end of the MCU module and is used for outputting the current converted by the driving circuit and sampling the current converted by the driving circuit;
the output end of the MCU module is electrically connected with the input end of the control circuit and is used for outputting an SPWM waveform (Sinusoidal Pulse Width Modulation) based on the converted current and controlling the on-off of the control circuit;
the output end of the control circuit is electrically connected with the drive circuit and is used for controlling the on-off of the drive circuit based on the received SPWM waveform signal.
Furthermore, the utility model also comprises a main transformer and an auxiliary transformer;
wherein, the main transformer and the auxiliary transformer are electrically connected;
the output end of the driving circuit is respectively electrically connected with the main transformer and the auxiliary transformer and is used for converting the current of the main transformer;
the input end of the sampling circuit is connected with the main transformer and is used for outputting the current transformed by the main transformer and sampling the transformed current;
the output end of the control circuit is electrically connected with the auxiliary transformer and used for controlling the conduction or cut-off of the auxiliary transformer based on the received SPWM waveform signal.
Further, in order to reduce the thermal loss and improve the electromagnetic compatibility of the laser power supply, the utility model discloses set up that drive circuit switches on and cuts off the frequency between 10KHz to 150 KHz.
Furthermore, the MCU module outputs two paths of mutually exclusive SPWM waveforms through internal program programming, and the dead time, the frequency and the duty ratio of the SPWM waveforms are adjustable. The working frequency of the MCU is more than 20MHz, and the sampled current signal can be rapidly converted into an SPWM waveform signal, so that the rapid constant voltage and constant current functions are realized.
In addition, the MCU module also comprises an error proportional amplifying circuit which is used for amplifying the received current signal.
In the utility model, the control circuit comprises at least two transistors, and the two SPWM waveforms respectively control the two transistors to be sequentially and alternately conducted; the drive circuit comprises two transistors, two SPWM waveforms are sequentially conducted in turn by conducting and stopping the transistors in the control circuit, and the transmission direction of current in the main transformer is changed by the conversion of the SPWM waveforms, so that input direct current is converted into alternating current.
In addition, the on-time of a transistor in the control circuit is controlled by the frequency and the duty ratio of two SPWM waveforms; the conduction time of a transistor in the driving circuit is controlled by two SPWM waveforms through the control circuit, the current transmitted to the main transformer is changed by the conversion of the duty ratio of the SPWM waveforms, and then the size of an output circuit in the sampling circuit is changed, so that stable constant-voltage and constant-current output is realized.
In addition, a switch is arranged between the driving circuit and the auxiliary transformer and controls the on and off of the pulse solid laser power supply.
Specifically, the switch may be any one of a mechanical switch or a transistor.
The utility model provides a drive circuit in a pulse solid laser power supply for converting input current; the sampling circuit outputs the current converted by the driving circuit and samples the current converted by the driving circuit; the MCU module outputs SPWM waveform based on the converted current and controls the on/off of the control circuit; the control circuit controls the on or off of the driving circuit based on the received SPWM waveform signal, and finally the purpose of stably outputting the required large and small currents is achieved; furthermore, the utility model also comprises a main transformer and an auxiliary transformer, wherein the main transformer is electrically connected with the auxiliary transformer; the output end of the driving circuit is electrically connected with the main transformer and the auxiliary transformer to realize the transformation of the current of the main transformer; the input end of the sampling circuit is connected with the main transformer, outputs the current transformed by the main transformer and samples the transformed current; the output end of the control circuit is electrically connected with the auxiliary transformer, and the auxiliary transformer is controlled to be switched on or switched off based on the received SPWM waveform signal. In addition, the MCU module outputs two SPWM waveforms with mutually exclusive waveforms. The sampling circuit collects current signals in the circuit, the MCU module outputs two SPWM waveforms according to the received current signals, the transistors in the control circuit are controlled to be conducted alternately, and then the transistors in the driving circuit are controlled to be conducted alternately, so that conversion from direct current to alternating current is realized. On the other hand, the two SPWM waveforms control the conduction time of the transistor in the control circuit, so that the conduction time of the transistor in the driving circuit is controlled, and rapid constant current control is realized. The utility model provides a pulse solid laser power, simple structure adopts the SPWM technique, through the frequency and the duty cycle of adjustment SPWM wave form, adjusts the size and the direction of electric current, the utility model discloses the electric current harmonic of output is little, and power live time is long, and the frequency through transistor among the control drive circuit, and heat loss is few, and the high-usage of electric energy, power efficiency improves.
The following is a specific embodiment provided by the present invention.
A power flow schematic diagram of a pulsed solid state laser, comprising: the device comprises a driving circuit, a sampling circuit, an MCU module and a control circuit.
Fig. 2 is a circuit diagram of the driving circuit, the auxiliary transformer and the main transformer provided in this embodiment connected as a whole, and as shown in fig. 2, the driving circuit includes a capacitor C5, a capacitor C6, a resistor R1, a resistor R2, a diode D3, a diode D4, a first transistor Q1, and a second transistor Q2. The collector of the first transistor Q1 is connected with the rectified direct current input voltage, the base of the first transistor Q1 is connected with the resistor and then connected with the ST10 pin of the auxiliary transformer, the emitter of the first transistor Q1 is connected with the ST6 pin of the auxiliary transformer and the collector of the second transistor Q2; the base of the second transistor Q2 is connected with a resistor and then connected with the ST9 pin of the auxiliary transformer, and the emitter of the second transistor Q2 is grounded GND. The ST7 pin of the auxiliary transformer is grounded, the ST8 pin of the auxiliary transformer is connected with the main transformer, and the ST6 pin of the auxiliary transformer is connected with the midpoint of the half-bridge circuit, so as to prevent the current of the main transformer from being overlarge.
In the present embodiment, the switching frequency of the first transistor Q1 and the second transistor Q2 is limited to between 10KHz and 150 KHz.
Fig. 3 is a circuit diagram of the sampling circuit provided in this embodiment, and as shown in fig. 3, the sampling circuit includes a rectifier diode, a filter inductor L1, a filter capacitor, and a current sampling sensor SENSER. The output of the rectifier diode is connected with a filter inductor L1 and a filter capacitor and then is connected with the positive end of the laser load; the output end of the main transformer is connected with the current sampling sensor SENSER and then connected with the negative end of the laser load.
The filter capacitor is an electrolytic capacitor and is used for reducing ripples of the output voltage, and the filter capacitor comprises C18 and C19. The positive poles of the filter capacitors are connected with the positive pole of the direct current circuit output, and the negative poles of the filter capacitors are connected with the negative pole of the direct current output. And the output of the main transformer is output after passing through the filter capacitor.
The MCU module is programmed by an internal program to output two paths of SPWM waveforms with mutually exclusive waveforms, the dead time is adjustable, and the SPWM waveforms change the duty ratio and the frequency in real time according to the feedback of the sampling circuit.
The MCU module comprises an error proportional amplifying circuit for amplifying the received voltage and current signals. The working frequency of the MCU is more than 20MHz, and the sampled voltage and current signals can be rapidly converted into SPWM waveform signals.
Fig. 4 is a circuit diagram of the control circuit provided in the present embodiment, and as shown in fig. 4, includes a transistor Q4 and a transistor Q6. The bases of the transistors Q4 and Q6 are connected with the SPWM waveform output of the MCU module, the emitters of the transistors Q4 and Q6 are grounded, and the collectors of the transistors Q4 and Q6 are respectively connected with pins ST1 and ST3 of the auxiliary transformer. The two SPWMs respectively control transistors Q4 and Q6 to be sequentially turned on in turn, and the turn-on frequency and the turn-on duty ratio are determined by the SPWM.
Because the waveforms of the two SPWM paths are mutually exclusive, the voltages of the ST10 pin and the ST9 pin of the auxiliary transformer are opposite, when the transistor Q4 is turned on, the ST10 pin is at a high level, the ST9 pin is at a low level, the ST10 pin outputs a high level, and the high level is applied to the base of the first transistor Q1 through the D1, the R5, the C10 and the R7, so that the first transistor Q1 is turned on. At this time, since the output of ST9 is low, the second transistor Q2 is in an off state. The input current flows into the main transformer through the first transistor Q1. Correspondingly, when the transistor Q6 is turned on, the pin ST10 is at a low level, the pin ST9 is at a high level, and the input current flows into the main transformer through the second transistor Q2. The conversion of the direct current to the alternating current is realized through the alternate conduction of the first transistor Q1 and the second transistor Q2.
On the other hand, when the load becomes larger, the current output by the sampling circuit decreases, that is, the current flowing through the current sampling sensor SENSER becomes smaller, and the signal output to the MCU becomes smaller. The MCU increases the duty ratio of the SPWM according to the error value of the current signal, increases the on-time of the transistor Q4 and the transistor Q6, increases the time of the high level of the pins ST10 and ST9 of the auxiliary transformer, and then increases the on-time of the first transistor Q1 and the second transistor Q2, increases the current flowing through the main transformer, and increases the output current.
When the load becomes smaller, the current output by the sampling circuit increases, that is, the current flowing through the current sampling sensor SENSER becomes larger, and the signal output to the MCU becomes larger. The MCU reduces the duty cycle of the SPWM according to the error value of the current signal, reduces the on-time of the transistor Q4 and the transistor Q6, correspondingly reduces the time of the high level of the pins ST10 and ST9 of the auxiliary transformer, and reduces the on-time of the first transistor Q1 and the second transistor Q2, so that the current flowing through the main transformer is reduced, and the output current is also reduced accordingly. By adjusting the on-time of the first transistor Q1 and the second transistor Q2, fast constant current control is achieved.
The utility model provides a pulse solid laser power supply in which a driving circuit transforms the current of a main transformer; the sampling circuit outputs the current transformed by the main transformer and samples the transformed current; the MCU module outputs SPWM waveform based on the converted current and controls the on/off of the control circuit; the control circuit controls the conduction or the cut-off of the auxiliary transformer based on the received SPWM waveform signal, and finally the purpose of stably outputting the required large and small currents is achieved. In addition, the MCU module outputs two SPWM waveforms with mutually exclusive waveforms. The sampling circuit collects current signals in the circuit, the MCU module outputs two SPWM waveforms according to the received current signals, the transistors in the control circuit are controlled to be conducted alternately, and then the transistors in the driving circuit are controlled to be conducted alternately, so that conversion from direct current to alternating current is realized. On the other hand, the two SPWM waveforms control the conduction time of the transistor in the control circuit, so that the conduction time of the transistor in the driving circuit is controlled, and rapid constant current control is realized. The utility model provides a pulse solid laser power, simple structure adopts the SPWM technique, through the frequency and the duty cycle of adjustment SPWM wave form, adjusts the size and the direction of electric current, the utility model discloses the electric current harmonic of output is little, and power live time is long, and the frequency through transistor among the control drive circuit, and heat loss is few, and the high-usage of electric energy, power efficiency improves.
The above description is only an embodiment of the present invention, and is not intended to limit the present invention in any way, and although the present invention is disclosed in the above preferred embodiments, it is not intended to limit the present invention, and any person skilled in the art can make some changes or modifications equal to the equivalent embodiments without departing from the technical scope of the present invention, and all fall within the technical scope of the present invention.
Claims (9)
1. A pulsed solid state laser power supply, comprising: the device comprises a driving circuit, a sampling circuit, an MCU module and a control circuit;
the output end of the driving circuit is electrically connected with the sampling circuit;
the output end of the sampling circuit is electrically connected with the input end of the MCU module;
the output end of the MCU module is electrically connected with the input end of the control circuit;
the output end of the control circuit is electrically connected with the driving circuit;
the MCU module outputs two paths of mutually exclusive SPWM waveforms for controlling the on/off of the control circuit, and the control circuit is used for controlling the on/off of the drive circuit based on the received SPWM waveform signals.
2. The pulsed solid state laser power supply of claim 1, further comprising a main transformer and an auxiliary transformer;
the main transformer and the auxiliary transformer are electrically connected;
the output end of the driving circuit is electrically connected with the main transformer and the auxiliary transformer respectively;
the input end of the sampling circuit is connected with the main transformer;
and the output end of the control circuit is electrically connected with the auxiliary transformer.
3. A pulsed solid state laser power supply as defined in claim 1 wherein said drive circuit is turned on and off at a frequency of between 10KHz and 150 KHz.
4. A pulsed solid state laser power supply as claimed in claim 1 wherein the MCU module further comprises an error proportional amplification circuit.
5. A pulsed solid state laser power supply according to claim 1, wherein said control circuit comprises at least two transistors, said two transistors being connected to the two SPWM outputs of said MCU module, respectively.
6. A pulsed solid state laser power supply as claimed in claim 5 wherein the drive circuit comprises two transistors each connected to a respective one of the two transistors of the control circuit via an auxiliary transformer.
7. The pulsed solid state laser power supply of claim 2, wherein said sampling circuit comprises a rectifier diode, a filter inductor, a filter capacitor, and a current sampling sensor;
the output end of the rectifier diode is sequentially connected with a filter inductor and a filter capacitor, and the filter capacitor is connected with the positive end of the laser;
the output end of the main transformer is connected with the current sampling sensor, and the current sampling sensor is connected with the negative end of the laser.
8. A pulsed solid state laser power supply as claimed in claim 2 wherein a switch is provided between the drive circuit and the auxiliary transformer.
9. A pulsed solid state laser power supply according to claim 8, wherein the switch is any one of a mechanical switch or a transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921561257.9U CN210468374U (en) | 2019-09-19 | 2019-09-19 | Pulse solid laser power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921561257.9U CN210468374U (en) | 2019-09-19 | 2019-09-19 | Pulse solid laser power supply |
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| Publication Number | Publication Date |
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| CN210468374U true CN210468374U (en) | 2020-05-05 |
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| CN201921561257.9U Active CN210468374U (en) | 2019-09-19 | 2019-09-19 | Pulse solid laser power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113733984A (en) * | 2021-08-30 | 2021-12-03 | 北京理工大学 | Auxiliary equalizing charge device based on SOC estimation |
-
2019
- 2019-09-19 CN CN201921561257.9U patent/CN210468374U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113733984A (en) * | 2021-08-30 | 2021-12-03 | 北京理工大学 | Auxiliary equalizing charge device based on SOC estimation |
| CN113733984B (en) * | 2021-08-30 | 2024-03-22 | 北京理工大学 | Auxiliary equalizing charge device based on SOC estimation |
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