CN212322145U - Multi-path parallel ultrahigh-speed low-voltage large-current pulse type constant current source - Google Patents
Multi-path parallel ultrahigh-speed low-voltage large-current pulse type constant current source Download PDFInfo
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Abstract
A multi-path parallel ultra-high-speed low-voltage large-current pulse type constant current source relates to the technical field of power supplies, and how to design a multi-path parallel ultra-high-speed large-current pulse type constant current source with output current reaching kiloamperes and pulse rising speed of microsecond level; through the independent control of multi-path output, the DSP controller sends out SPI signals, uniformly sends out the same given pulse signals, and inputs the same given pulse signals to a pulse signal generating source circuit to ensure the current sharing of a constant current source; the Hall current sensors of the main circuit respectively sample output currents of the IGBT emitters as feedback signals, the feedback signals are input into the pulse constant current source control circuit and compared with given signals, the feedback signals are used for controlling driving voltage, the IGBTs in the main circuit work in a linear region, the output current and the pulse width are controlled, and constant current output is achieved; the control signal EN uniformly controls the pulse signal to be switched on and off through the same I/O port, the consistency of the time sequence of the rising edge of the control signal is ensured, the parallel connection of multiple paths of IGBTs is realized, and the output current reaches the kiloampere level.
Description
Technical Field
The utility model relates to a power technical field is a parallelly connected hypervelocity low pressure heavy current pulsed constant current source of multichannel particularly.
Background
The constant current source is a constant current source which can output current which is not changed along with the change of self resistance value and the fluctuation of external voltage, and the pulse type constant current source is used in the tests of semiconductors, laser diodes, superconductors and the like. The pulse type constant current source which is ubiquitous in the market at present is low in current, the rising time of pulses is slow, along with the development and the progress of science and technology, the pulse type constant current source has a plurality of types and currents up to thousands of A in the field similar to semiconductors, and high requirements are provided for the pulse type constant current source, so that the research on the novel multi-path parallel connection, ultrahigh speed, pulse type and high-current constant current source has high frontier and importance.
An ideal constant current source should have the following characteristics: does not change due to load (output voltage) variations; does not change due to the change of the environmental temperature; the internal resistance is infinite (so that its current can flow out to the outside entirely). A circuit capable of supplying a constant current is a constant current source circuit, which is also called a current mirror circuit.
The basic constant current source circuit mainly comprises an input stage and an output stage, wherein the input stage provides a reference current, and the output stage outputs a required constant current. The basic principle of forming a constant current source circuit is as follows: the constant current source circuit is to provide a stable current to ensure the stable operation of other circuits. That is, the constant current source circuit is required to output a constant current, and therefore the device as the output stage should have a current-voltage characteristic of a saturated output current. This can be achieved using BJTs or MOSFETs operating in saturation of the output current.
To ensure that the current of the output transistor is stable, two conditions must be met: a) the input voltage of the power supply needs to be stable-the input stage needs to be a constant voltage source; b) the output resistance of the output transistor is as large as possible (preferably infinite) -the output stage needs to be a constant current source.
Requirements for input stage devices: since the input stage needs to be a constant voltage source, a device having voltage saturation current-voltage characteristics may be employed as the input stage. A general pn junction diode has such a characteristic-exponentially rising current-voltage characteristic; in addition, a diode formed by short-circuiting the source-drain of the enhancement MOSFET also has a similar current-voltage characteristic, namely a parabolic rising current-voltage characteristic. When a diode is used as an input stage device in an IC, the diode is generally an integrated diode formed by connecting transistors appropriately, because the diode can adapt to IC processes and has its special advantages. For these triodes, it is required to have a certain amplification performance, which enables the corresponding diodes to have a good constant voltage performance.
Requirements for output stage devices: if BJT is used, in order to increase its output resistance, it is necessary to try to reduce the Evarly effect (the base width modulation effect), i.e., to increase Early voltage as much as possible. If a MOSFET is used, it is necessary to try to reduce its channel length modulation effect and substrate bias effect in order to increase its output resistance. Thus, long channel MOSFETs are generally selected here, rather than short channel devices.
In the prior art, a chinese utility model patent application with application number 201621119580.7, published as 2017, 2, month and 22, discloses that a high-speed high-current pulse constant current source is mainly provided by energy stored by a capacitor at the initial working stage of a load by connecting a large capacitor in parallel with a power supply, and a microsecond-level rising edge is provided for the load; meanwhile, a high-power Darlington tube is connected with the load in series, so that the load is ensured to pass through pulse current of hundreds of amperes, and the load can be protected to work in a safe current mode.
Although the above patent application can generate constant current pulses with corresponding pulse widths and amplitudes according to different requirements, is applicable to loads such as resistors and LEDs, has the characteristics of simple structure, stable function, safety and reliability, and has the characteristics of faster rising edge (dozens of microseconds), larger current (hundreds of amperes), and the like, the output current of the constant current source only reaches the hundreds of amperes level, and in the published documents of the constant current source, a pulse type constant current source which can be connected in parallel in a multi-path manner, has the current amplitude reaching the thousands of amperes level and has the rising time reaching the microseconds level does not exist.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of how to design a high-speed heavy current pulse type constant current source which can realize multi-path parallel connection, can reach the kiloampere level of output current and has the pulse rising speed at the microsecond level.
The utility model discloses a solve above-mentioned technical problem through following technical scheme:
a multi-path parallel ultra-high-speed low-voltage large-current pulse type constant current source comprises a main circuit (S11), a pulse constant current source control circuit (S12), a pulse signal generating source (S13) circuit and a DSP controller (S14); the main circuit (S11) comprises a direct current power supply DC5, a capacitor C, a plurality of IGBTs, a plurality of Hall current sensors and a load; the IGBTs are connected in parallel, the emitting electrodes of the IGBTs are respectively connected with the positive electrode of a direct current power supply DC5, the collecting electrodes of the IGBTs are respectively connected with one end of a load, and the other end of the load is connected with the negative electrode of a direct current power supply DC 5; the DSP controller (S14) sends out an SPI signal and inputs a control signal EN to a pulse signal generating source (S13) circuit; the pulse signal generating source (S13) circuit is connected with the pulse constant current source control circuit (S12) and is used for sending a plurality of paths of independent PWM signal sources with adjustable amplitude, pulse width and frequency as given signals to the pulse constant current source control circuit (S12); the multiple independent outputs of the pulse constant current source control circuit (S12) are respectively and correspondingly connected with the gates of the IGBTs of the main circuit (S11); a plurality of Hall current sensors of the main circuit (S11) respectively sample emitter output currents of a plurality of IGBTs as feedback signals, the feedback signals are input into the pulse constant current source control circuit (S12) to be compared with given signals, the given signals are used for controlling driving voltage, the plurality of IGBTs in the main circuit (S11) are all enabled to work in a linear region, the output current size and the pulse width are controlled, and constant current output is achieved.
The difficulty of achieving kiloampere-level constant current output by adopting multi-path parallel connection is how to achieve current sharing, the rising edge time of a control signal is microsecond level, and the consistency of the rising edge of the control signal and the accuracy of controlling the current of each path are difficult to ensure; the technical scheme of the utility model is that through the independent control of the multi-path output, the DSP controller (S14) sends out the SPI signal, the same given voltage signal is sent out in a unified way, and the SPI signal is input into the pulse signal generating source (S13) circuit, thereby ensuring the current equalization of the constant current source; the multiple Hall current sensors of the main circuit (S11) respectively sample emitter output currents of multiple IGBTs as feedback signals, and input the feedback signals into the pulse constant current source control circuit (S12) to be compared with given signals, so that the drive voltage is controlled, the multiple IGBTs in the main circuit (S11) all work in a linear region, the output current and the pulse width are controlled, and constant current output is achieved; the control signal EN uniformly controls the on-off of the pulse signal through the same I/O port, the consistency of the rising edge of the control signal is ensured, the parallel connection of multiple paths of IGBTs is realized, and the output current reaches the kiloampere level.
As the utility model discloses technical scheme ' S further improvement, pulse constant current source control circuit (S12) including the multichannel IGBT drive circuit that the structure is the same, multichannel IGBT drive circuit ' S output respectively corresponding be connected with a plurality of IGBT ' S gate pole.
As a further improvement of the technical solution of the present invention, the IGBT driving circuit includes an operational amplifier, a dc power supply, a PNP type triode, an NPN type triode, and a driving resistor; the direct current power supply supplies power for the operational amplifier, the operational amplifier forms a proportional integral regulator, the NPN type triode and the NPN type triode form a push-pull driving circuit, a collector electrode of the NPN type triode and an emitter electrode of the NPN type triode are respectively connected between a positive electrode and a negative electrode of the direct current power supply, an input end of the push-pull driving circuit is connected with an output end of the proportional integral regulator, an output end of the push-pull driving circuit is connected with one end of the driving resistor, and the other end of the driving resistor is used as an output port of the IGBT driving circuit and is connected with a gate electrode of.
As the further improvement of the technical proposal of the utility model, the pulse signal generating source (S13) circuit comprises independent PWM signal source circuits with the same multipath structure, the output end of the multipath independent PWM signal source circuit respectively outputs multipath PWM signal sources with adjustable amplitude, pulse width and frequency, and the multipath PWM signal sources are respectively input to one input end of a proportional-integral regulator in the corresponding multipath IGBT driving circuit as given signals; and the other input end of the proportional-integral regulator is respectively connected with the output ends of the Hall current sensors of the main circuit and is used for inputting the sampling current of the Hall current sensors as a feedback signal.
As the technical scheme of the utility model is further improved, each said independent PWM signal source circuit includes a digital isolation conversion chip, a digital-to-analog conversion chip, one is the high-speed opto-coupler, the SPI signal is input to the digital-to-analog conversion chip after the digital isolation conversion chip is isolated and changed, and is changed into the controllable analog voltage of amplitude through the digital-to-analog conversion chip; the control signal EN generates an isolated enable signal through high-speed optical coupling isolation to control the on-off of the digital-to-analog conversion chip, so that the pulse width and the frequency of the PWM signal are controlled.
As a further improvement of the technical scheme of the utility model, the electric capacity C include a plurality of Kathon 63V/22000uF electrolytic capacitor and a plurality of EACO700V/845uF film capacitor, a plurality of electrolytic capacitor and a plurality of film capacitor connect in parallel.
As the further improvement of the technical proposal of the utility model, the model of a plurality of IGBTs is the British flying FF600R12ME 4.
As the technical scheme of the utility model further improve, a plurality of hall current sensor' S model be lyme sensor LF-505S.
As the technical scheme of the utility model further improves, operational amplifier's model be ADA4610-1, the model of PNP type triode be FTZ951, the model of NPN type triode is FZT 851.
As the utility model discloses technical scheme's further improvement, the model of digit isolation conversion chip be ADUM1401, digital-to-analog conversion chip's model is DAC8830, the model of high-speed opto-coupler is 6N 137.
The utility model has the advantages that:
(1) the technical scheme of the utility model is that through the independent control of the multi-path output, the DSP controller (S14) sends out the SPI signal, the same given voltage signal is sent out in a unified way, and the SPI signal is input into the pulse signal generating source (S13) circuit, thereby ensuring the current equalization of the constant current source; the multiple Hall current sensors of the main circuit (S11) respectively sample emitter output currents of multiple IGBTs as feedback signals, and input the feedback signals into the pulse constant current source control circuit (S12) to be compared with given signals, so that the drive voltage is controlled, the multiple IGBTs in the main circuit (S11) all work in a linear region, the output current and the pulse width are controlled, and constant current output is achieved; the control signal EN uniformly controls the on-off of the pulse signal through the same I/O port, the consistency of the rising edge of the control signal is ensured, the parallel connection of multiple paths of IGBTs is realized, and the output current reaches the kiloampere level.
(2) The operational amplifier forms a proportional-integral regulator, the regulation speed of the proportional-integral regulator can reach 21V/us, and the proportional-integral regulator has the characteristics of high regulation speed, low offset voltage and low temperature drift;
(3) the NPN type triode and the NPN type triode form a push-pull driving circuit, and the driving capability of the push-pull driving circuit is enhanced; the output of the push-pull driving circuit is connected with the driving resistor, so that the rising speed of the driving voltage is improved.
(4) A plurality of large electrolytic capacitors on the laminated busbar are in parallel discharge, so that parasitic inductance on a circuit is reduced, a raised microsecond level is realized, and low ESR and low inductance of a circuit main loop are realized.
(5) The current sampling of the Hall current sensor adopts high-edge isolation sampling, so that the sampling interference is reduced, and the control accuracy is easy to realize.
(6) The method is realized by adopting the DSP instead of the FPGA, so that the cost is lower, and the scheme is simpler and easier to realize.
Drawings
Fig. 1 is a schematic circuit diagram of a multi-path parallel ultra-high-speed low-voltage large-current pulse type constant current source according to an embodiment of the present invention.
Detailed Description
In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are combined with the following description to clearly and completely describe the technical solution in the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The technical solution of the present invention is further described below with reference to the drawings and specific embodiments of the specification:
example one
As shown in fig. 1, the multi-path parallel ultra-high-speed low-voltage large-current pulse type constant current source comprises a main circuit (S11), a pulse constant current source control circuit (S12) and a pulse signal generating source (S13) circuit; the pulse signal generating source (S13) circuit is connected with the pulse constant current source control circuit (S12) and is used for sending a PWM signal source with adjustable amplitude, pulse width and frequency to the pulse constant current source control circuit (S12) as a given signal; the multi-path output of the pulse constant current source control circuit (S12) is respectively correspondingly connected with the IGBTs of the main circuit (S11), the output currents of the emitters of the IGBTs of the main circuit (S11) are input into the pulse constant current source control circuit (S12) as feedback signals, given signals are compared with the feedback signals, and a proportional-integral regulator is adopted to control driving voltage, so that the IGBTs in the main circuit (S11) all work in a linear region, the control of the output current and the pulse width is realized, and the constant current output is achieved.
The main circuit (S11) comprises a direct current power supply DC5, a capacitor C and a plurality of IGBTs, wherein four IGBTs are connected in parallel in the embodiment and are respectively a first IGBT, a second IGBT, a third IGBT, a fourth IGBT, a plurality of Hall current sensors and a load; two ends of the capacitor C are connected between the positive electrode and the negative electrode of the direct current power supply DC5 in parallel; the emitter of the first IGBT, the emitter of the second IGBT, the emitter of the third IGBT and the emitter of the fourth IGBT are all connected to the positive pole of a direct-current power supply DC5, the collector of the first IGBT, the collector of the second IGBT, the collector of the third IGBT and the collector of the fourth IGBT are all connected to one end of a load, and the other end of the load is connected to the negative pole of a direct-current power supply DC 5; the first Hall current sensor to the fourth Hall current sensor are respectively used for sampling the output currents of the emitting electrodes of the first IGBT to the fourth IGBT and feeding back the output currents to the pulse constant current source control circuit (S12), and the plurality of IGBTs in the main circuit (S11) are all operated in a linear region through the control of the driving voltage in the pulse constant current source control circuit (S12), so that the control of the output current size and the pulse width is realized, and the constant current output is achieved; and the sampling interference is reduced by adopting high-edge isolation sampling, and the control accuracy is easy to realize.
A capacitor C is charged by a direct current power supply DC5, a direct current power supply DC5 is a 48V voltage power supply, the capacitor C is formed by connecting a plurality of electrolytic capacitors of Kaempferon 63V/22000uF and a plurality of film capacitors of EACO700V/845uF in parallel, the plurality of large electrolytic capacitors on the laminated busbar are connected in parallel to discharge, parasitic inductance on a circuit is reduced, microsecond level rising is achieved, and low ESR (Equivalent Series Resistance) and low inductance of a circuit main loop are achieved.
The first IGBT to the fourth IGBT adopt Yingfei Ling FF600R12ME4, so that the output current of each path is larger, the output current reaches kiloampere level, and the rising edge time of each path is favorably controlled to reduce the overshoot of the current when the current is switched on; the first Hall current sensor to the fourth Hall current sensor adopt a Lyme sensor LF-505S; the load is a power semiconductor or a resistor.
The pulse constant current source control circuit (S12) comprises four IGBT drive circuits with the same structure, and the output ends of the four IGBT drive circuits are respectively connected with the gate pole of the first IGBT, the gate pole of the second IGBT, the gate pole of the third IGBT and the gate pole of the fourth IGBT.
Taking the first IGBT driving circuit as an example to be specifically explained: the first IGBT driving circuit comprises an operational amplifier U1, the model number of which is ADA 4610-1; a direct current power supply DC1 with a voltage of + -15V; the PNP type triode Q1 and the NPN type triode Q2 are arranged, the model of the triode Q1 is FTZ951, and the model of the triode Q2 is FZT 851; a drive resistor R1; the direct-current power supply DC1 supplies power to the operational amplifier U1, the operational amplifier U1 forms a proportional-integral regulator, the regulation speed of the proportional-integral regulator can reach 21V/us, and the proportional-integral regulator has the characteristics of high regulation speed, low offset voltage and low temperature drift; the triode Q1 and the triode Q2 form a push-pull driving circuit, a collector of the triode Q2 and an emitter of the triode Q1 are respectively connected between the positive pole and the negative pole of a direct-current power supply DC1, the input end of the push-pull driving circuit is connected with the output end of the proportional-integral regulator, the output end of the push-pull driving circuit is connected to one end of a driving resistor R1, and the other end of the driving resistor R1 is used as the output port of the first IGBT driving circuit and is correspondingly connected with the gate pole of the first IGBT; the push-pull driving circuit enhances the driving capability; the driving resistor R1 improves the stability of the driving voltage.
The pulse signal generating source (S13) circuit comprises four independent PWM signal source circuits with the same structure, and the output ends of the four independent PWM signal source circuits respectively output four PWM signal sources with adjustable amplitude, pulse width and frequency, namely PWM 1-PWM 4; the PWM 1-PWM 4 are respectively input to one input end of a proportional-integral regulator in the corresponding four-way IGBT driving circuit to be used as given signals; and the other input end of the proportional-integral regulator is respectively connected with the output ends of the first Hall current sensor to the fourth Hall current sensor of the main circuit and is used for inputting the sampling current of the Hall current sensors as a feedback signal.
The first path of independent PWM signal source circuit is taken as an example for specific explanation: the first independent PWM signal source circuit comprises a digital isolation conversion chip U5, the type of which is ADUM 1401; a digital-to-analog conversion chip U9, model DAC 8830; one is a high-speed optical coupler U13 with the model number of 6N 137; a DSP (Digital Signal processing) controller (S14) sends out an SPI Signal and a control Signal EN; a Serial Peripheral Interface (SPI), which is a synchronous Serial Interface technology and is a high-speed, full-duplex, synchronous communication bus, includes a CS/SDI/SDO/CLK signal, and the SPI signal is isolated and converted by a digital isolation conversion chip U5, then input into a digital-to-analog conversion chip U9, and converted by a digital-to-analog conversion chip U9 into an analog voltage with a controllable amplitude; the control signal EN is isolated by a high-speed optocoupler U13 to generate an isolated enabling signal to control the on-off of a digital-to-analog conversion chip U9, so that the pulse width and the frequency of a PWM signal are controlled; the method is realized by adopting the DSP instead of the FPGA, so that the cost is lower, and the scheme is simpler and easier to realize.
The difficulty of achieving kiloampere-level constant current output by adopting multi-path parallel connection is how to achieve current sharing, the rising edge time of a control signal is microsecond level, and the consistency of the rising edge of the control signal and the accuracy of controlling the current of each path are difficult to ensure; in the technical scheme, the multichannel output is independently controlled, and the DSP uniformly issues the same given voltage signal to ensure the current equalization of the constant current source; the pulse signals are uniformly controlled to be switched on and switched off through the same I/O port, and the consistency of the rising edges of the control signals is ensured.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (10)
1. A multi-path parallel ultra-high-speed low-voltage large-current pulse type constant current source is characterized by comprising a main circuit (S11), a pulse constant current source control circuit (S12), a pulse signal generating source (S13) circuit and a DSP controller (S14); the main circuit (S11) comprises a direct current power supply DC5, a capacitor C, a plurality of IGBTs, a plurality of Hall current sensors and a load; the IGBTs are connected in parallel, the emitting electrodes of the IGBTs are respectively connected with the positive electrode of a direct current power supply DC5, the collecting electrodes of the IGBTs are respectively connected with one end of a load, and the other end of the load is connected with the negative electrode of a direct current power supply DC 5; the DSP controller (S14) sends out an SPI signal and inputs a control signal EN to a pulse signal generating source (S13) circuit; the pulse signal generating source (S13) circuit is connected with the pulse constant current source control circuit (S12) and is used for sending a plurality of paths of independent PWM signal sources with adjustable amplitude, pulse width and frequency as given signals to the pulse constant current source control circuit (S12); the multiple independent outputs of the pulse constant current source control circuit (S12) are respectively and correspondingly connected with the gates of the IGBTs of the main circuit (S11); a plurality of Hall current sensors of the main circuit (S11) respectively sample emitter output currents of a plurality of IGBTs as feedback signals, the feedback signals are input into the pulse constant current source control circuit (S12) to be compared with given signals, the given signals are used for controlling driving voltage, the plurality of IGBTs in the main circuit (S11) are all enabled to work in a linear region, the output current size and the pulse width are controlled, and constant current output is achieved.
2. The constant current source of claim 1, wherein the pulse constant current source control circuit (S12) comprises a plurality of IGBT driving circuits having the same structure, and the output terminals of the plurality of IGBT driving circuits are respectively connected to the gate electrodes of the plurality of IGBTs.
3. The constant current source of claim 2, wherein the IGBT driver circuit comprises an operational amplifier, a dc power supply, a PNP transistor and an NPN transistor, a driving resistor; the direct current power supply supplies power for the operational amplifier, the operational amplifier forms a proportional integral regulator, the NPN type triode and the NPN type triode form a push-pull driving circuit, a collector electrode of the NPN type triode and an emitter electrode of the NPN type triode are respectively connected between a positive electrode and a negative electrode of the direct current power supply, an input end of the push-pull driving circuit is connected with an output end of the proportional integral regulator, an output end of the push-pull driving circuit is connected with one end of the driving resistor, and the other end of the driving resistor is used as an output port of the IGBT driving circuit and is connected with a gate electrode of.
4. The constant current source of claim 3, wherein the pulse signal generating source (S13) circuit comprises multiple independent PWM signal source circuits with the same structure, the output ends of the multiple independent PWM signal source circuits respectively output multiple PWM signal sources with adjustable amplitude, pulse width and frequency, and the multiple PWM signal sources are respectively input to one input end of a proportional-integral regulator in the corresponding multiple IGBT driving circuits as given signals; and the other input end of the proportional-integral regulator is respectively connected with the output ends of the Hall current sensors of the main circuit and is used for inputting the sampling current of the Hall current sensors as a feedback signal.
5. The constant current source according to claim 4, wherein each of the independent PWM signal source circuits includes a digital isolation conversion chip, a digital-to-analog conversion chip, and a high-speed optical coupler, the SPI signal is isolated and converted by the digital isolation conversion chip, and then input to the digital-to-analog conversion chip, and converted by the digital-to-analog conversion chip into an analog voltage with controllable amplitude; the control signal EN generates an isolated enable signal through high-speed optical coupling isolation to control the on-off of the digital-to-analog conversion chip, so that the pulse width and the frequency of the PWM signal are controlled.
6. The constant current source of claim 1, wherein the capacitor C comprises a plurality of kapton 63V/22000uF electrolytic capacitors and a plurality of EACO700V/845uF membrane capacitors, and the plurality of electrolytic capacitors are connected in parallel with the plurality of membrane capacitors.
7. The constant current source of claim 1, wherein the IGBTs are of the type of an inflight FF600R12ME 4.
8. The constant current source of claim 1, wherein said plurality of hall current sensors are of the type of lambda sensor LF-505S.
9. The constant current source of claim 3, wherein the operational amplifier is of the type ADA4610-1, the PNP triode is of the type FTZ951, and the NPN triode is of the type FZT 851.
10. The constant current source of claim 5, wherein the digital isolation conversion chip is of the type ADUM1401, the digital-to-analog conversion chip is of the type DAC8830, and the high-speed optical coupler is of the type 6N 137.
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| CN112000167A (en) * | 2020-09-23 | 2020-11-27 | 合肥科威尔电源系统股份有限公司 | Multi-path parallel ultrahigh-speed low-voltage large-current pulse type constant current source |
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Cited By (3)
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| CN112000167A (en) * | 2020-09-23 | 2020-11-27 | 合肥科威尔电源系统股份有限公司 | Multi-path parallel ultrahigh-speed low-voltage large-current pulse type constant current source |
| CN112000167B (en) * | 2020-09-23 | 2021-11-12 | 合肥科威尔电源系统股份有限公司 | Multi-path parallel ultrahigh-speed low-voltage large-current pulse type constant current source |
| WO2022062191A1 (en) * | 2020-09-23 | 2022-03-31 | 合肥科威尔电源系统股份有限公司 | Parallel-connected highspeed low-voltage large-current pulsed constant current source |
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Address after: 230088 Building 2, Hupu Industrial Park, No. 4715, Wangjiang West Road, hi tech Zone, Hefei City, Anhui Province Patentee after: Cowell Technology Co.,Ltd. Address before: 230088 Building 2, Hupu Industrial Park, No. 4715, Wangjiang West Road, hi tech Zone, Hefei City, Anhui Province Patentee before: Hefei Kewei Power System Co.,Ltd. |