CN107171554B - Voltage-regulating power supply of pulse xenon lamp pumping laser welding machine - Google Patents
Voltage-regulating power supply of pulse xenon lamp pumping laser welding machine Download PDFInfo
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- CN107171554B CN107171554B CN201710537211.2A CN201710537211A CN107171554B CN 107171554 B CN107171554 B CN 107171554B CN 201710537211 A CN201710537211 A CN 201710537211A CN 107171554 B CN107171554 B CN 107171554B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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Abstract
The invention relates to a voltage regulating power supply of a pulse xenon lamp pumping laser welding machine, which comprises a rectifying circuit, an energy storage capacitor, a boosting circuit, a rectifying voltage sampling circuit, an energy storage capacitor voltage sampling circuit and a voltage regulating control circuit, wherein the rectifying circuit is connected with the energy storage capacitor; the output positive electrode of the rectifying circuit is connected with the negative electrode of the energy storage capacitor, and the output end of the boosting circuit is connected with the positive electrode of the energy storage capacitor; the voltage regulation control circuit comprises a differential amplifier; collecting the voltage of the positive output electrode of the rectifying circuit through a rectifying voltage sampling circuit and inputting the voltage into a differential amplifier; the energy storage capacitor voltage sampling circuit collects the positive voltage of the energy storage capacitor and inputs the positive voltage into the differential amplifier; the voltage regulation control circuit controls the operation and stop of the boost circuit according to the feedback voltage output by the differential amplifier, thereby controlling the wide-range regulation of the voltage of the energy storage capacitor, and realizing the wide-range regulation of the voltage of the energy storage capacitor, namely, the voltage which can be larger than or equal to the voltage of the rectification output and the voltage which can be smaller than the voltage of the rectification output, and the power device is few, and the volume is greatly reduced.
Description
Technical Field
The invention relates to the technical field of laser power supplies, in particular to a voltage-regulating power supply of a pulse xenon lamp pump laser welding machine.
Background
The pulse xenon lamp pump laser is widely applied to laser welding, and a power supply for the pulse xenon lamp pump laser is generally called a laser welding power supply for short. The laser welding power supply is an energy source of a pulse xenon lamp pumping YAG laser, provides pumping energy for the xenon lamp pumping laser and controls laser output energy, is a power supply device for the xenon lamp pumping YAG laser welding machine, and is applied to laser welding equipment such as jewelry laser welding machines, mould laser welding machines, automatic laser welding machines and the like. In laser welding applications, the waveform of the single pulse laser energy affects the welding effect, with typical power ranges for pulsed xenon lamp pumped YAG laser welding power sources being 1KW to 20KW, pulse current ranges 30A to 400A, pulse width 1 ms to 20 ms.
There are two ways of current power supplies for pulsed xenon lamp pumped lasers: the current regulating mode A is that after the power frequency alternating current is subjected to half-wave voltage doubling rectification and filtration, the pulse current of the xenon lamp is controlled by a switch chopper module and an air core inductor, the total capacity of a filter capacitor reaches more than 2 kilo mu F, the impact interference to a power grid is large, and the electromagnetic radiation of the air core inductor is large; the voltage regulating mode requires the voltage regulating range of the energy storage capacitor to be 100V to 500V, after the power frequency alternating current is directly rectified and filtered, the voltage is regulated by a half-bridge or full-bridge circuit, a high-power energy storage transformer, a high-power resonance inductor and a high-power resonance capacitor are needed, the circuit is complex, power devices are too many, the size and the weight are large, the power grid interference is relatively large, and the cost is too high.
In summary, the current laser welding machine has poor electromagnetic compatibility, large volume and high cost. Currently, the national power grid is pushing new electromagnetic compatibility standards, and the efficiency, volume, weight, anti-interference performance, ripple and the like of the power supply all put forward brand new requirements. The traditional laser welding power source has the disadvantages of large power loss, excessive circuit parts, low efficiency, large power grid interference and huge volume. With the continuous development of laser welding technology, the laser welding power supply has higher and higher requirement efficiency and smaller volume, and provides a new difficult problem for power supply design. Therefore, a laser welding voltage regulating power supply with small electromagnetic interference, high electromagnetic compatibility, high efficiency and small volume will become the main stream of development.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the voltage regulating power supply of the pulse xenon lamp pumping laser welding machine, which can realize wide-range regulation of the voltage of the energy storage capacitor, namely, the voltage which can be larger than or equal to the voltage of the rectification output and the voltage which can be smaller than the voltage of the rectification output, and has fewer power devices and greatly reduced volume.
The invention provides a voltage regulating power supply of a pulse xenon lamp pump laser welding machine, which comprises the following components: the device comprises a rectifying circuit, an energy storage capacitor, a boosting circuit, a rectifying voltage sampling circuit, an energy storage capacitor voltage sampling circuit and a voltage regulation control circuit; the input end of the rectifying circuit is connected with an alternating current power supply, the output positive electrode of the rectifying circuit is connected with the negative electrode of the energy storage capacitor, and the output negative electrode of the rectifying circuit is grounded; the input end of the boosting circuit is connected with the output positive electrode of the rectifying circuit, the output end of the boosting circuit is connected with the positive electrode of the energy storage capacitor, and the control end of the boosting circuit is connected with the voltage regulation control circuit; the voltage regulation control circuit comprises a differential amplifier; the sampling end of the rectification voltage sampling circuit is connected with the output positive electrode of the rectification circuit, and the output end of the rectification voltage sampling circuit is connected with the negative input end of the differential amplifier; the sampling end of the energy storage capacitor voltage sampling circuit is connected with the positive electrode of the energy storage capacitor, and the output end of the energy storage capacitor voltage sampling circuit is connected with the positive input end of the differential amplifier; the voltage regulation control circuit controls the operation and stop of the boost circuit according to the feedback voltage output by the differential amplifier, so as to control the wide-range regulation of the voltage of the energy storage capacitor.
In the invention, the positive electrode of the energy storage capacitor is respectively connected with the negative electrode of the follow current diode, the negative electrode of the energy storage capacitor is connected with the positive electrode of the output of the rectifying circuit, so that the voltage difference between the two ends of the energy storage capacitor can be larger than or equal to the voltage output by the rectifying circuit or smaller than the voltage output by the rectifying circuit, the voltage regulation range of the energy storage capacitor can reach 0V at the lowest, and the highest value of the adjustable voltage of the energy storage capacitor depends on the withstand voltage values of the power switch device and the energy storage capacitor. Compared with the voltage regulation mode in the prior art, the scheme of the embodiment can provide a wider voltage regulation range.
Preferably, the power supply comprises at least two paths of booster circuits, wherein the input end of each path of booster circuit is connected with the output positive electrode of the rectifying circuit, the output end of each path of booster circuit is connected with the positive electrode of the energy storage capacitor, the control end of each path of booster circuit is connected with the voltage regulation control circuit, and the output ends of all the booster circuits are connected with the output negative electrode of the rectifying circuit through the high-voltage absorption capacitor.
Preferably, the boost circuit comprises an energy storage inductor, a freewheel diode and a switch tube, wherein one end of the energy storage inductor is an input end of the boost circuit, the other end of the energy storage inductor is connected with an output negative electrode of the rectifying circuit through the switch tube, a control end of the switch tube is a control end of the boost circuit, an anode of the freewheel diode is connected with the other end of the energy storage inductor, and a negative electrode of the freewheel diode is connected with an anode of the energy storage capacitor; a current sensor is connected in series between the energy storage inductor and the freewheeling diode, and the current sensor detects a current signal in the boost circuit and sends the current signal to the voltage regulation control circuit; the voltage regulation control circuit outputs a pulse modulation signal for controlling the switching tube according to the comparison result of the voltage waveform signal output by the rectification voltage sampling circuit and the current signal of the boosting circuit, so that the current waveform of the boosting circuit and the current waveform of the alternating current power supply are synchronous.
Preferably, the voltage regulation control circuit generates multiple control signals which are staggered with each other to the control end of the boost circuit.
Preferably, the voltage regulation control circuit includes: the pulse generator, the frequency divider, the first comparators, the pulse width controllers and the drivers; the number of the first comparators, the pulse width controllers and the drivers is the same as that of the boosting circuits, and the number of the signal output ends of the frequency dividers is the same as that of the boosting circuits; the output end of the pulse generator is connected with the clock input end of the frequency divider, one signal output end of the frequency divider is connected with the clock output end of the pulse width controller, the output end of the pulse width controller is connected with the control end of the switching tube through the driver, the negative input end of the first comparator is connected with the output end of the current sensor, the positive input end of the first comparator is connected with the output end of the rectifying voltage sampling circuit, and the output end of the first comparator is connected with the enabling end of the pulse width controller.
Preferably, the voltage regulation control circuit further comprises an operation interface, wherein a user can modify the voltage set value through the operation interface, and the operation interface sends the voltage set value to the voltage regulation control circuit; the voltage regulation control circuit further comprises a second comparator, the negative input end of the second comparator is connected with the output end of the differential amplifier, the positive input end of the second comparator is connected with the output end of the voltage set value, and the output end of the second comparator is connected with the enabling end of the frequency divider.
Preferably, a high-frequency filter capacitor is connected between the output positive electrode of the rectifying circuit and the output negative electrode of the rectifying circuit.
Preferably, the energy storage capacitor is formed by connecting a plurality of electrolytic capacitors in parallel or in series-parallel.
Preferably, the high voltage absorption capacitor is a metallized film capacitor.
Compared with the prior art, the power regulating source provided by the invention adopts staggered parallel boosting, reduces the current in each power tube and the energy storage inductor, has fewer power switch devices in the circuit, has no electromagnetic radiation generated by the air core inductor, and has the advantages of simple structure, small volume, small electromagnetic interference and high efficiency, so that the power factor of the power source is high, the electromagnetic compatibility is good, and the electro-optical efficiency of the laser welding machine can be effectively improved. In addition, the slow charging resistor and contactor in the prior art are omitted, the large electrolytic capacitor without rectification and filtering is omitted, the volume of the energy storage inductor is greatly reduced, the advantages of low cost and the like are achieved, and meanwhile, the current waveform of the alternating current power supply is synchronous with the voltage waveform, the current waveform of the input power supply is sine wave, so that the electromagnetic interference of the power supply is minimized.
Drawings
Fig. 1 is a circuit diagram of a voltage regulating power supply of a pulse xenon lamp pump laser welding machine according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a voltage regulation control circuit according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of another voltage regulating power supply of a pulse xenon lamp pump laser welding machine according to the embodiment of the present invention;
FIG. 4 shows two paths of pulse signals output by the frequency divider;
fig. 5 shows control signals output from the driver Q1 and the driver Q2;
fig. 6 is a current waveform in the energy storage inductor L1 and the energy storage inductor L2;
fig. 7 is a voltage waveform and a current waveform output from the rectifying circuit.
Detailed Description
Embodiments of the technical scheme of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and thus are merely examples, which should not be construed as limiting the scope of the present invention.
It is noted that unless otherwise indicated, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.
Example 1
As shown in fig. 1, this embodiment provides a voltage regulating power supply of a pulse xenon lamp pump laser welding machine, including: the device comprises a rectifying circuit 1, an energy storage capacitor C3, a boosting circuit 2, a rectifying voltage sampling circuit 3, an energy storage capacitor voltage sampling circuit 4 and a voltage regulation control circuit 5.
Fig. 1 shows only part of the voltage regulation control circuit, the remainder being shown in fig. 2. The connections of the circuits in fig. 1 and 2 are indicated with the same network identification.
The input end L, N of the rectifying circuit 1 is connected with an alternating current power supply, the alternating current power supply is generally 220V alternating current, the output positive electrode 11 of the rectifying circuit 1 is connected with the negative electrode of the energy storage capacitor C3, and the output negative electrode 12 of the rectifying circuit 1 is connected with the power supply reference ground.
The input end 21 of the booster circuit 2 is connected with the output positive electrode 11 of the rectifying circuit 1, the output end 22 of the booster circuit 2 is connected with the positive electrode of the energy storage capacitor C3, and the control end of the booster circuit is connected with the voltage regulation control circuit.
The voltage regulation control circuit 5 includes a differential amplifier U1. The sampling end 31 of the rectification voltage sampling circuit 3 is connected with the output positive electrode 11 of the rectification circuit 1, and the output end ZLBX of the rectification voltage sampling circuit 3 is connected with the negative input end of the differential amplifier U1. The sampling end 41 of the energy storage capacitor voltage sampling circuit 4 is connected with the positive electrode of the energy storage capacitor C3, and the output end DRDY of the energy storage capacitor voltage sampling circuit 4 is connected with the positive input end of the differential amplifier U1. The voltage regulation control circuit 5 controls the operation and stop of the booster circuit 2 according to the feedback voltage outputted from the output terminal FKDY of the differential amplifier U1, thereby controlling the wide-range regulation of the voltage of the storage capacitor C3.
A high-frequency filter capacitor C1 is connected between the output positive electrode 11 of the rectifier circuit 1 and the output negative electrode 12 of the rectifier circuit 1. The rectifier bridge in the rectifier circuit 1 is preferably GBPC5010, and the high-frequency filter capacitor C1 is preferably a CBB capacitor of 2uF275 VAC. The energy storage capacitor C3 is preferably 2 electrolytic capacitors of 500V6800uF connected in parallel so as to improve the capacity of the energy storage capacitor for storing electric energy.
As shown in fig. 1, the boost circuit 2 includes an energy storage inductor L1, a freewheeling diode D1, and a switching tube T1, wherein one end of the energy storage inductor L1 is an input end 21 of the boost circuit 2, the other end of the energy storage inductor L1 is connected with an output negative electrode 11 of the rectifying circuit 1 through the switching tube T1, a control end QD1 of the switching tube T1 is a control end of the boost circuit 2, an anode of the freewheeling diode D1 is connected with the other end of the energy storage inductor L1, and a cathode of the freewheeling diode D1 is connected with an anode of the energy storage capacitor C3. A current sensor HG1 is connected in series between the energy storage inductor L1 and the flywheel diode D1, and the current sensor HG1 detects a current signal in the boost circuit 2 and sends the current signal to the voltage regulation control circuit 5. The voltage regulation control circuit 5 outputs a pulse modulation signal for controlling the switching transistor T1 based on the comparison result between the voltage waveform signal output from the rectified voltage sampling circuit 3 and the current signal of the booster circuit 2, and synchronizes the current waveform of the booster circuit 2 with the current waveform of the ac power supply. A high-voltage absorption capacitor C2 is also connected between the negative electrode of D1 and the output negative electrode 11 of the rectifying circuit 1.
The high-voltage absorption capacitor C2 is used for limiting the voltage rising speed of the switching tube and preventing the switching tube from being damaged by overvoltage, and the high-voltage absorption capacitor C2 is preferably a 1200V 1uF metallized film capacitor. The energy storage inductors L1 and L2 are preferably iron silicon aluminum annular iron silicon aluminum inductors. The current sensors HG1 and HG2 are preferably 200:1 current transformers. The switching transistors T1 and T2 are preferably IGBT transistors K40T1203. Freewheeling diodes D1 and D2 are preferably fast-recovery diodes RHRG75120.
In the preferred embodiment of the rectified voltage sampling circuit 3, as shown in fig. 1, one end of a resistor R1 is connected to the rectified output positive electrode, and the other end is connected to the negative input end of the differential amplifier U1 as an output end ZLBX.
In the preferred embodiment of the storage capacitor voltage sampling circuit 4, as shown in fig. 1, resistors R3 and R4 are connected in series, and a line is led out from the connection of R3 and R4 as an output terminal DRDY of the storage capacitor voltage sampling circuit 4, where the output terminal DRDY is connected to the positive input terminal of the differential amplifier U1.
The voltage regulation control circuit 5 is used for acquiring various parameter indexes in the voltage regulation power supply, such as: the voltage of the positive terminal of the energy storage capacitor C3 output by the energy storage capacitor voltage sampling circuit 4, the voltage V2 of the rectified voltage V1 output by the rectified voltage sampling circuit 3, the current signal I1 of the energy storage inductor L1 output by the current sensor HG1, the voltage set value Vr output by the operation interface 9, and the like. Through the parameter indexes, the operation and the stop of the booster circuit 2 are controlled according to preset logic, so that the wide-range adjustment of the voltage of the energy storage capacitor C3 is controlled. A circuit capable of realizing the above-described logic control can be used in the present embodiment, and therefore, the specific structure of the voltage regulation control circuit 5 is not limited here.
In order to reduce the cost and achieve efficient control, the present embodiment provides a preferred embodiment of the voltage regulation control circuit 5, as shown in fig. 2, the voltage regulation control circuit 5 includes a pulse generator U2, a frequency divider U3, first comparators U5 and U6, pulse width controllers PWM1 and PWM2, drivers Q1 and Q2, and a second comparator U4. The pulse output end O of the pulse generator U2 is connected with the clock input end CLK of the frequency divider U3, the signal output end Q of the frequency divider U3 is connected with the clock output end CLK of the pulse width controller PWM1, and the output end Q of the pulse width controller PWM1 is connected with the control end QD1 of the switching tube T1 through the driver Q1. The negative input end of the first comparator U5 is connected with the output end DL1 of the current sensor HG1, the positive input end of the first comparator U5 is connected with the output end ZLBX of the rectification voltage sampling circuit 3, and the output end of the first comparator U5 is connected with the enabling end of the pulse width controller PWM1The negative input end of the second comparator U4 is connected with the output end FKDY of the differential amplifier U1, the positive input end of the second comparator U4 is connected with the output end SDZ of the voltage set value, and the output end of the second comparator U4 and the enabling end of the frequency divider U3 are->And (5) connection. Since only one booster circuit 2 needs to be controlled in the voltage-regulating power supply of the present embodiment, the first comparator U6, the pulse width controller PWM2 and the driver Q2 are not needed in the actual voltage-regulating control circuit 5 to save devices.
As shown in fig. 1, the voltage regulating power supply of the present embodiment further includes an operation interface 9, and the user can modify the voltage set value through the operation interface 9, and the operation interface 9 sends the voltage set value to the second comparator U4 in the voltage regulating control circuit 5. The operation interface 9 may be a touch liquid crystal screen or a combination of a display and a control keyboard.
The specific connection mode of the voltage-regulating power supply of the embodiment applied to the power supply of the pulse xenon lamp pump laser is shown in fig. 3, and the energy storage capacitor C3 is connected in parallel with the xenon lamp precombustion and pulse energy control circuit.
The working principle of the voltage-regulating power supply of the embodiment is specifically as follows:
the pulse generator U2 generates a pulse signal and sends the pulse signal to the frequency divider U3, the frequency divider U3 outputs two complementary square waves with a duty ratio of 50% (as shown in fig. 4), one square wave is input into the input end CLK of the pulse width controller PWM1, and the pulse width controller PWM1 outputs a square wave signal. The output signal of the pulse width controller PWM1 is sent to the driver Q1, and the output of the driver Q1 is sent to the G pole of the switching tube T1 to control the on and off of the switching tube T1. When the input end CLK of the pulse width controller PWM1 receives the rising edge signal of the pulse, a high level is output, and the switching tube T1 is conducted.
The input ac power is rectified by the rectifier circuit 1 as shown in fig. 7, and the rectified power is charged into the energy storage inductor L1. When the switching tube T1 is turned on, the energy storage inductor L1 starts to store energy, and when the switching tube T1 is turned off, the energy storage inductor L1 charges the energy storage capacitor C3 through the freewheel diode D1.
During the process of storing energy into the energy storage inductance L1, the current signal I1 is compared with the rectified voltage V1 by the comparator U5, when I1 is larger than V1, the comparator U5 outputs low level, when the input end of the pulse width controller PWM1When the voltage is low, the output end Q of the PWM1 outputs low level, and the switching tube T1 is cut off; after the switching tube T1 is turned off and turned off, the current signal I1 drops, the comparator U5 outputs a high level, the switching tube T1 is still in an off-state, and when the input end CLK of the pulse width controller PWM1 receives the rising edge signal of the pulse again, the switching tube T1 is controlled to be turned on. According to the comparison result of the current signal I1 and the rectified voltage V1, the pulse modulation signal of the switching tube T1 is controlled, so that the current waveform of the booster circuit 2 and the waveform of the rectified current are synchronous, electromagnetic interference is reduced, and the power factor is improved.
The reverse input end of the differential amplifier U1 is a rectification voltage V1, the forward input end is a voltage V2 of the positive electrode of the energy storage capacitor C3, and the voltage V3 = V2-V1 of the energy storage capacitor is obtained through the differential amplifier U1, namely, the difference value of the voltage of the positive electrode end and the voltage of the negative electrode end of the energy storage capacitor C3.
The reverse input end of the comparator U4 is the energy storage capacitor voltage V3, and the forward input end is the voltage set value Vr. When V3 is larger than Vr, the comparator U4 outputs a low level, the low level output by the comparator U4 controls the frequency divider U3 to stop outputting pulses, and the pulse width controller is closed at the moment; when V3 is smaller than Vr, the high level output by the comparator U4 controls the frequency divider U3 to output a pulse, and the pulse width controller restarts to work. In this way, the user can control the voltage of the storage capacitor by modifying the voltage set point.
When the voltage at two ends of the energy storage capacitor C3 reaches the voltage value set by the user, the voltage regulation control circuit 5 outputs a control signal to the xenon lamp precombustion and pulse energy control circuit to conduct the switching tube T3, and under the condition that the high-voltage isolating switch JC1 is closed, the energy storage capacitor C3 provides pulse electric energy for the xenon lamp XD1 to enable the xenon lamp to work to generate laser.
In this embodiment, the positive electrode of the energy storage capacitor C3 is connected with the negative electrode of the freewheeling diode D1, and the negative electrode of the energy storage capacitor C3 is connected with the positive electrode of the output of the rectifying circuit 1, so that the voltage difference between the two ends of the energy storage capacitor C3 may be greater than or equal to the voltage output by the rectifying circuit 1, or may be less than the voltage output by the rectifying circuit, the voltage adjustment range of the energy storage capacitor C3 may reach 0V at the lowest, and the highest value of the adjustable voltage of the energy storage capacitor C3 depends on the withstand voltage values of the power switch device and the energy storage capacitor C3. Compared with the voltage regulation mode in the prior art, the scheme of the embodiment can provide a wider voltage regulation range.
The voltage regulating power supply provided by the embodiment has only a few power switch devices such as T1 and D1, and no electromagnetic radiation generated by air core inductance, and has the advantages of simple structure, small volume, small electromagnetic interference and high efficiency, so that the power factor of the power supply is high, the electromagnetic compatibility is good, and the electro-optical efficiency of the laser welding machine can be effectively improved.
In addition, the slow charging resistor and contactor in the prior art are omitted, the large electrolytic capacitor without rectification and filtering is omitted, the volume of the energy storage inductor is greatly reduced, the advantages of low cost and the like are achieved, and meanwhile, the current waveform of the alternating current power supply is synchronous with the voltage waveform, the current waveform of the input power supply is sine wave, so that the electromagnetic interference of the power supply is minimized.
Example two
As shown in fig. 3, this embodiment provides a voltage regulating power supply of a pulse xenon lamp pump laser welding machine, including: the device comprises a rectifying circuit 1, an energy storage capacitor C3, a two-way booster circuit 2, a rectifying voltage sampling circuit 3, an energy storage capacitor voltage sampling circuit 4 and a voltage regulation control circuit 5.
Only a portion of the voltage regulation control circuit is shown in fig. 3, the remainder being shown in fig. 2. The connections of the circuits in fig. 2 and 3 are indicated with the same network identification.
The input end L, N of the rectifying circuit 1 is connected with an alternating current power supply, the alternating current power supply is generally 220V alternating current, the output positive electrode 11 of the rectifying circuit 1 is connected with the negative electrode of the energy storage capacitor C3, and the output negative electrode 12 of the rectifying circuit 1 is connected with the power supply reference ground.
The input end 21 of the booster circuit 2 is connected with the output positive electrode 11 of the rectifying circuit 1, the output end 22 of the booster circuit 2 is connected with the positive electrode of the energy storage capacitor C3, and the control end of the booster circuit is connected with the voltage regulation control circuit.
The voltage regulation control circuit 5 includes a differential amplifier U1. The sampling end 31 of the rectification voltage sampling circuit 3 is connected with the output positive electrode 11 of the rectification circuit 1, and the output end ZLBX of the rectification voltage sampling circuit 3 is connected with the negative input end of the differential amplifier U1. The sampling end 41 of the energy storage capacitor voltage sampling circuit 4 is connected with the positive electrode of the energy storage capacitor C3, and the output end DRDY of the energy storage capacitor voltage sampling circuit 4 is connected with the positive input end of the differential amplifier U1. The voltage regulation control circuit 5 controls the operation and stop of the two-way booster circuit 2 according to the feedback voltage outputted by the output end FKDY of the differential amplifier U1, thereby controlling the wide-range regulation of the voltage of the energy storage capacitor C3.
A high-frequency filter capacitor C1 is connected between the output positive electrode 11 of the rectifier circuit 1 and the output negative electrode 12 of the rectifier circuit 1. The rectifier bridge in the rectifier circuit 1 is preferably GBPC5010, and the high-frequency filter capacitor C1 is preferably 2 CBB capacitors of 2uF275VAC connected in parallel. The energy storage capacitor C3 is preferably formed by connecting 4 electrolytic capacitors with the voltage of 500V6800uF in parallel so as to improve the capacity of the energy storage capacitor for storing electric energy.
As shown in fig. 3, the booster circuit 2 includes two booster circuits 2, and the two booster circuits 2 have the same configuration. The energy storage inductor L1, the current sensor HG1, the switching tube T1 and the freewheeling diode D1 are sequentially connected to form a booster circuit; the energy storage inductor L2, the current sensor HG2, the switching tube T2 and the freewheeling diode D2 are sequentially connected to form another path of boost circuit. The outputs of the two booster circuits 2 (the cathodes of the freewheeling diodes D1 and D2) are connected in parallel with the high-voltage absorption capacitor C2 to form a staggered parallel booster circuit. The output of the two booster circuits 2 is connected with the positive electrode of the energy storage capacitor C3. The voltage regulation control circuit 5 outputs a pulse modulation signal for controlling the switching transistors T1 and T2 based on the comparison result of the voltage waveform signal output from the rectified voltage sampling circuit 3 and the current signal of the two-way booster circuit 2, so that the current waveform of the two-way booster circuit 2 and the current waveform of the ac power supply are synchronized.
The high-voltage absorption capacitor C2 is used for limiting the voltage rising speed of the switching tube and preventing the switching tube from being damaged by overvoltage, and the high-voltage absorption capacitor C2 is preferably a 1200V 1uF metallized film capacitor. The energy storage inductors L1 and L2 are preferably iron silicon aluminum annular iron silicon aluminum inductors. The current sensors HG1 and HG2 are preferably 200:1 current transformers. The switching transistors T1 and T2 are preferably IGBT transistors K40T1203. Freewheeling diodes D1 and D2 are preferably fast-recovery diodes RHRG75120.
In the preferred embodiment of the rectified voltage sampling circuit 3, as shown in fig. 3, one end of a resistor R1 is connected to the rectified output positive electrode, and the other end is connected to the negative input end of the differential amplifier U1 as an output end ZLBX.
In the preferred embodiment of the storage capacitor voltage sampling circuit 4, as shown in fig. 3, resistors R3 and R4 are connected in series, and a line is led out from the connection of R3 and R4 as an output terminal DRDY of the storage capacitor voltage sampling circuit 4, where the output terminal DRDY is connected to the positive input terminal of the differential amplifier U1.
The voltage regulation control circuit 5 is used for acquiring various parameter indexes in the voltage regulation power supply, such as: the voltage V1 of the rectification voltage output by the rectification voltage sampling circuit 3, the voltage V2 of the positive end of the energy storage capacitor C3 output by the energy storage capacitor voltage sampling circuit 4, the current signal I1 of the energy storage inductor L1 output by the current sensor HG1, the current signal I2 of the energy storage inductor L2 output by the current sensor HG2, the voltage set value Vr output by the operation interface 9 and the like. Through the parameter indexes, the operation and the stop of the two paths of boost circuits 2 are controlled according to preset logic, so that the wide-range adjustment of the voltage of the energy storage capacitor C3 is controlled. A circuit capable of realizing the above-described logic control can be used in the present embodiment, and therefore, the specific structure of the voltage regulation control circuit 5 is not limited here.
In order to better explain the inventive concept of the present embodiment, and to explain the working principle, the present embodiment provides a preferred embodiment mode of the voltage regulation control circuit 5, as shown in fig. 2, the voltage regulation control circuit 5 includes a pulse generator U2, a frequency divider U3, first comparators U5, U6, pulse width controllers PWM1, PWM2, drivers Q1, Q2, and a second comparator U4. The pulse output end O of the pulse generator U2 is connected with the clock input end CLK of the frequency divider U3, the signal output end Q of the frequency divider U3 is connected with the clock output end CLK of the pulse width controller PWM1, and the output end Q of the pulse width controller PWM1 is connected with the control end QD1 of the switching tube T1 through the driver Q1. The negative input end of the first comparator U5 is connected with the output end DL1 of the current sensor HG1, the positive input end of the first comparator U5 is connected with the output end ZLBX of the rectification voltage sampling circuit 3, and the output end of the first comparator U5 is connected with the enabling end of the pulse width controller PWM1The negative input end of the first comparator U6 is connected with the output end DL2 of the current sensor HG2, the positive input end of the first comparator U6 is connected with the output end ZLBX of the rectification voltage sampling circuit 3, and the output end of the first comparator U6 is connected with the enabling end of the pulse width controller PWM2>The negative input end of the second comparator U4 is connected with the output end FKDY of the differential amplifier U1, the positive input end of the second comparator U4 is connected with the output end SDZ of the voltage set value, and the output end of the second comparator U4 and the enabling end of the frequency divider U3And (5) connection.
As shown in fig. 3, the voltage regulating power supply of the present embodiment further includes an operation interface 9, and the user can modify the voltage set value through the operation interface 9, and the operation interface 9 sends the voltage set value to the second comparator U4 in the voltage regulating control circuit 5. The operation interface 9 may be a touch liquid crystal screen or a combination of a display and a control keyboard.
The circuit of the voltage regulating power supply of the embodiment is applied to the power supply of the pulse xenon lamp pump laser, and the specific connection mode is shown in fig. 3, and the energy storage capacitor C3 is connected in parallel with the xenon lamp precombustion and pulse energy control circuit.
The input signals of the voltage regulation control circuit 5 include: the output end of the rectification voltage sampling circuit 3 rectifies the voltage V1, the voltage V2 at the positive end of the energy storage capacitor C3 output by the energy storage capacitor voltage sampling circuit 4, the current signal I1 of the energy storage inductor L1 output by the current sensor HG1, the current signal I2 of the energy storage inductor L2 output by the current sensor HG2 and the voltage set value Vr output by the operation interface 9. The output signal of the voltage regulation control circuit 5 includes a control signal for controlling the switching transistors T1, T2.
The working principle of the voltage regulation control circuit of the embodiment is specifically as follows:
the pulse generator U2 generates a pulse signal and sends the pulse signal to the frequency divider U3, the frequency divider U3 outputs two complementary square waves with a duty ratio of 50% (as shown in fig. 4), the two square waves are respectively sent to the input terminals CLK of the pulse width controllers PWM1 and PWM2, and the outputs of the pulse width controllers PWM1 and PWM2 are mutually staggered waveforms. The output signals of the pulse width controller PWM1 and the pulse width controller PWM2 are respectively sent to the driver Q1 and the driver Q2, the outputs of the driver Q1 and the driver Q2 are respectively sent to the G poles of the switching tube T1 and the switching tube T2, the on and off of the switching tube T1 and the switching tube T2 are controlled, and the outputs of the driver Q1 and the driver Q2 are shown in fig. 5. When the input end CLK of the pulse width controller PWM1 receives a rising edge signal of a pulse, a high level is output, and the switching tube T1 is conducted; when the input end CLK of the pulse width controller PWM2 receives the rising edge signal of the pulse, a high level is output, and the switching tube T2 is conducted.
As shown in fig. 7, the voltage waveform and the current waveform output by the ac power supply after passing through the rectifying circuit 1 are shown, and the shaped power supply charges the energy storage inductors L1 and L2. When the switching tube T1 is turned on, the energy storage inductor L1 starts to store energy, and when the switching tube T1 is turned off, the energy storage inductor L1 charges the energy storage capacitor C3 through the freewheel diode D1. When the switching tube T2 is turned on, the energy storage inductor L2 starts to store energy, and when the switching tube T2 is turned off, the energy storage inductor L2 charges the energy storage capacitor C3 through the flywheel diode D2. Under the control of the voltage regulation control circuit 5, the T1 and the T2 are alternately conducted, the energy storage capacitor C3 is alternately charged through two circuits, an interleaved parallel boost circuit is adopted, the current high-frequency ripple amplitude of an input power supply can be reduced by half, and meanwhile, the current in each circuit of power tube and the current in the energy storage inductor are reduced. The current waveforms of the energy storage inductors L1 and L2 are shown in fig. 6.
During the process of storing energy into the energy storage inductance L1, the current signal I1 is compared with the rectified voltage V1 by the comparator U5, when I1 is larger than V1, the comparator U5 outputs low level, when the input end of the pulse width controller PWM1When the voltage is low, the output end Q of the PWM1 outputs low level, and the switching tube T1 is cut off; after the switching tube T1 is turned off and turned off, the current signal I1 drops, the comparator U5 outputs a high level, the switching tube T1 is still in an off-state, and when the input end CLK of the pulse width controller PWM1 receives the rising edge signal of the pulse again, the switching tube T1 is controlled to be turned on. According to the comparison result of the current signal I1 and the rectified voltage V1, the pulse modulation signal of the switching tube T1 is controlled, so that the current waveform of the booster circuit 2 and the waveform of the rectified current are synchronous, electromagnetic interference is reduced, and the power factor is improved. The method for controlling the switching tube T2 is the same as T1, and will not be described here again.
The reverse input end of the differential amplifier U1 is a rectification voltage V1, the forward input end is a voltage V2 of the positive electrode of the energy storage capacitor C3, and the voltage V3 = V2-V1 of the energy storage capacitor is obtained through the differential amplifier U1, namely, the difference value of the voltage of the positive electrode end and the voltage of the negative electrode end of the energy storage capacitor C3.
The reverse input end of the comparator U4 is the energy storage capacitor voltage V3, and the forward input end is the voltage set value Vr. When V3 is larger than Vr, the comparator U4 outputs a low level, the low level output by the comparator U4 controls the frequency divider U3 to stop outputting pulses, and the pulse width controller is closed at the moment; when V3 is smaller than Vr, the high level output by the comparator U4 controls the frequency divider U3 to output a pulse, and the pulse width controller restarts to work. In this way, the user can control the voltage of the storage capacitor by modifying the voltage set point.
When the voltage at two ends of the energy storage capacitor C3 reaches the voltage value set by the user, the voltage regulation control circuit 5 outputs a control signal to the xenon lamp precombustion and pulse energy control circuit to conduct the switching tube T3, and under the condition that the high-voltage isolating switch JC1 is closed, the energy storage capacitor C3 provides pulse electric energy for the xenon lamp XD1 to enable the xenon lamp to work to generate laser.
According to the principle, more than two paths of booster circuits 2 can be connected in parallel to form a plurality of paths of mutually staggered parallel booster circuits, so that the current high-frequency ripple amplitude of an input power supply is further reduced, the current of each path of booster circuit is reduced, and better benefits are obtained. On the circuit, only the number of the first comparators, the pulse width controllers and the drivers is guaranteed to be the same as that of the boosting circuits, the number of signal output ends of the frequency dividers is the same as that of the boosting circuits, and multiple paths of mutually staggered control signals are generated through the voltage regulation control circuit to respectively control switching tubes of the boosting circuits of all paths, so that the multiple paths of mutually staggered parallel boosting circuits are realized.
In this embodiment, the positive electrode of the energy storage capacitor C3 is connected to the negative electrodes of the freewheeling diode D1 and the freewheeling diode D2, and the negative electrode of the energy storage capacitor C3 is connected to the positive electrode of the output of the rectifying circuit 1, so that the voltage difference between the two ends of the energy storage capacitor C3 may be greater than or equal to the voltage output by the rectifying circuit 1, or may be less than the voltage output by the rectifying circuit, the voltage adjustment range of the energy storage capacitor C3 may reach 0V at the lowest, and the highest value of the adjustable voltage of the energy storage capacitor C3 depends on the withstand voltage values of the power switch device and the energy storage capacitor C3. Compared with the voltage regulation mode in the prior art, the scheme of the embodiment can provide a wider voltage regulation range.
The voltage regulating power supply provided by the embodiment has only 4 total power switch devices of T1, D1, T2 and D2, has no electromagnetic radiation generated by air core inductance, and has the advantages of simple structure, small volume, small electromagnetic interference and high efficiency, so that the power factor of the power supply is high, the electromagnetic compatibility is good, and the electro-optical efficiency of the laser welding machine can be effectively improved.
In addition, the slow charging resistor and contactor in the prior art are omitted, the large electrolytic capacitor without rectification and filtering is omitted, the volume of the energy storage inductor is greatly reduced, the advantages of low cost and the like are achieved, and meanwhile, the current waveform of the alternating current power supply is synchronous with the voltage waveform, the current waveform of the input power supply is sine wave, so that the electromagnetic interference of the power supply is minimized.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description.
Claims (9)
1. A voltage regulating power supply for a pulse xenon lamp pumped laser welder, comprising:
the device comprises a rectifying circuit, an energy storage capacitor, a boosting circuit, a rectifying voltage sampling circuit, an energy storage capacitor voltage sampling circuit and a voltage regulation control circuit;
the input end of the rectifying circuit is connected with an alternating current power supply, the output positive electrode of the rectifying circuit is connected with the negative electrode of the energy storage capacitor, and the output negative electrode of the rectifying circuit is connected with the power supply reference ground;
the input end of the boosting circuit is connected with the output positive electrode of the rectifying circuit, the output end of the boosting circuit is connected with the positive electrode of the energy storage capacitor, and the control end of the boosting circuit is connected with the voltage regulation control circuit;
the voltage regulation control circuit comprises a differential amplifier;
the sampling end of the rectification voltage sampling circuit is connected with the output positive electrode of the rectification circuit, and the output end of the rectification voltage sampling circuit is connected with the negative input end of the differential amplifier;
the sampling end of the energy storage capacitor voltage sampling circuit is connected with the positive electrode of the energy storage capacitor, and the output end of the energy storage capacitor voltage sampling circuit is connected with the positive input end of the differential amplifier;
the voltage regulation control circuit controls the operation and stop of the boost circuit according to the feedback voltage output by the differential amplifier, so as to control the wide-range regulation of the voltage of the energy storage capacitor.
2. The voltage-regulating power supply according to claim 1, comprising at least two booster circuits, wherein the input end of each booster circuit is connected with the output positive electrode of the rectifying circuit, the output end of each booster circuit is connected with the positive electrode of the energy storage capacitor, the control end of each booster circuit is connected with the voltage-regulating control circuit, and the output ends of all booster circuits are connected with the output negative electrode of the rectifying circuit through high-voltage absorption capacitors.
3. The voltage-regulating power supply according to claim 1 or 2, wherein the boost circuit comprises an energy storage inductor, a freewheel diode and a switch tube, one end of the energy storage inductor is an input end of the boost circuit, the other end of the energy storage inductor is connected with an output negative electrode of the rectifying circuit through the switch tube, a control end of the switch tube is a control end of the boost circuit, an anode of the freewheel diode is connected with the other end of the energy storage inductor, and a negative electrode of the freewheel diode is connected with an anode of the energy storage capacitor;
a current sensor is connected in series between the energy storage inductor and the freewheeling diode, and the current sensor monitors a current signal in the boost circuit and sends the current signal to the voltage regulation control circuit;
the voltage regulation control circuit outputs a pulse modulation signal for controlling the switching tube according to the comparison result of the rectified voltage output by the rectified voltage sampling circuit and the current signal of the boosting circuit, so that the current waveform of the boosting circuit and the current waveform of the alternating current power supply are synchronous.
4. A voltage regulator according to claim 3, wherein the voltage regulator control circuit generates a plurality of mutually staggered control signals to the control terminal of the boost circuit.
5. A voltage regulator power supply according to claim 3, wherein the voltage regulation control circuit comprises: the pulse generator, the frequency divider, the first comparators, the pulse width controllers and the drivers; the number of the first comparators, the pulse width controllers and the drivers is the same as that of the boosting circuits, and the number of the signal output ends of the frequency dividers is the same as that of the boosting circuits;
the output end of the pulse generator is connected with the clock input end of the frequency divider, one signal output end of the frequency divider is connected with the clock output end of the pulse width controller, the output end of the pulse width controller is connected with the control end of the switching tube through the driver, the negative input end of the first comparator is connected with the output end of the current sensor, the positive input end of the first comparator is connected with the output end of the rectifying voltage sampling circuit, and the output end of the first comparator is connected with the enabling end of the pulse width controller.
6. The voltage regulator power supply of claim 5, further comprising an operator interface through which a user can modify the voltage set point, the operator interface sending the voltage set point to the voltage regulator control circuit;
the voltage regulation control circuit further comprises a second comparator, wherein the negative input end of the second comparator is connected with the output end of the differential amplifier, the positive input end of the second comparator receives the voltage set value, and the output end of the second comparator is connected with the enabling end of the frequency divider.
7. The voltage-regulating power supply of claim 1, wherein a high-frequency filter capacitor is connected between the output positive electrode of the rectifying circuit and the output negative electrode of the rectifying circuit.
8. The voltage regulator of claim 1, wherein the energy storage capacitor is formed by a plurality of electrolytic capacitors connected in parallel or in series-parallel.
9. The voltage regulator of claim 2, wherein the high voltage absorption capacitor is a metallized film capacitor.
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| US5510974A (en) * | 1993-12-28 | 1996-04-23 | Philips Electronics North America Corporation | High frequency push-pull converter with input power factor correction |
| JP4375914B2 (en) * | 2001-03-30 | 2009-12-02 | 新電元工業株式会社 | Switching power supply |
| CN100352150C (en) * | 2001-12-28 | 2007-11-28 | 中兴通讯股份有限公司 | Power factor correction method and its equipment |
| JP2011152017A (en) * | 2010-01-25 | 2011-08-04 | Murata Mfg Co Ltd | Switching power supply device |
| CN104038042B (en) * | 2013-03-04 | 2016-12-28 | 珠海格力电器股份有限公司 | Alternating expression circuit of power factor correction and control method thereof |
| CN104242422B (en) * | 2014-08-27 | 2016-09-28 | 武汉凌云光电科技有限责任公司 | The charging method of a kind of pulse xenon lamp power source storage capacitor and charging circuit |
| JP6451586B2 (en) * | 2015-10-13 | 2019-01-16 | 株式会社富士通ゼネラル | DC power supply |
| CN106602865B (en) * | 2016-12-26 | 2019-10-25 | 中国电子科技集团公司第十一研究所 | A kind of energy storage capacitor charging circuit and pulse laser power supply |
| CN206894502U (en) * | 2017-07-04 | 2018-01-16 | 东莞市微视激光科技有限责任公司 | The voltage controller power source of xenon flash lamp pumping laser bonding machine |
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