Multiplexing high-power power supply based on path modulation and control method

Abstract

The invention discloses a multiplexing high-power power supply based on path modulation, and belongs to the technical field of power supply design, and the multiplexing high-power power supply comprises a voltage conversion module, a switch modulation module and a load access module. The switch working mode of the switch modulation module is adjusted by controlling the difference value between the drain-source voltage VDS and the gate-source voltage VGS of the MOS tube, so that the first output end outputs a direct current waveform, or the second output end outputs a pulse waveform or a square waveform to supply power to different loads, and the power supply efficiency is improved. The power supply with one topological structure can meet various output requirements; in addition, the voltage can reach the 10kV level, the current can reach the 10kA level, and the device has important significance for miniaturization and integration of power supplies under the conditions of complex input power supplies and multiple types of loads. In addition, the voltage can reach the 10kV level, the current can reach the 10kA level, and the device has important significance for miniaturization and integration of power supplies under the conditions of complex input power supplies and multiple types of loads.

Description

Technical Field

[0001] The present invention belongs to the technical field of power supply design, and more specifically, relates to a multiplexed high-power power supply and a control method based on path modulation. Background Art

[0002] High-power power supplies can output high voltage and high current after rectifying, boosting and inverting different forms of electrical energy. They are widely used in many fields such as electrostatic precipitators, military equipment, detection equipment, etc., and are the core link of power conversion.

[0003] When high-power power supplies are used with different loads, the voltage and current waveforms required to be output vary greatly. For example, in electrostatic dust removal applications, stable DC high voltage is required to be output, with a voltage level of 10kV; in electromagnetic emission applications, 10kA-level pulsed high current is required to be output, which requires a certain amount of energy compression on a time scale to achieve instantaneous power doubling; in semiconductor laser applications, the laser works in pulse drive mode, the rise and fall time of the pulse emission determines the measurement accuracy, and the peak power of the pulse determines the measurement range. It is required to output high-power continuous square wave current, and a high-quality, high-power pulse laser drive circuit is essential.

[0004] However, the existing conventional power supplies have a single output current waveform. When faced with complex input power supplies and multiple types of load conditions, multiple sets of power supplies with different topologies are required to meet complex output requirements. The operation is complicated and is not conducive to miniaturization and convenience. Summary of the invention

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a multiplexed high-power power supply based on path modulation, which aims to solve the technical problem that the existing power supply has a single output current waveform and is subject to limited application.

[0006] To achieve the above object, according to one aspect of the present invention, a multiplexed high-power power supply based on path modulation is provided, comprising:

[0007] A voltage conversion module, used for converting an input voltage into a DC voltage signal of a preset amplitude;

[0008] A switch modulation module, comprising: a MOS tube, a diode, a current transformer, a current sampling unit and a driving unit; the MOS tube and the diode are connected in reverse parallel, and the drain of the MOS tube is connected to the positive electrode of the voltage conversion module, and the source of the MOS tube is connected to the input end of the current transformer; the gate of the MOS tube is connected to the output end of the driving unit; the output end of the current transformer is connected to the input end of the current sampling unit, and the output end of the current sampling unit is connected to the input end of the driving unit;

[0009] The load access module includes: a first output end and a second output end in different paths, the first output end is connected to the positive pole of the voltage conversion module and is used to output a DC waveform, and the second output end is connected to the output end of the current transformer and is used to output a pulse waveform or a square wave waveform.

[0010] In one embodiment, when the drain-source voltage V DS and the gate-source voltage V GS Meet V GS <V th When the MOS tube works in the cut-off region and is not turned on, the first output terminal outputs a DC waveform.

[0011] In one embodiment, when the drain-source voltage V DS and the gate-source voltage V GS Meet V GS ≥V th And V DS <V GS -V th When the MOS tube works in the variable resistance region, the drain-source voltage V GS If the voltage remains unchanged, the MOS tube is equivalent to a closed switch, and the second output end outputs a pulse waveform.

[0012] In one embodiment, when the MOS tube drain-source voltage V DS and the gate-source voltage V GS Meet V GS ≥V th And V DS ≥V GS -V th When the MOS tube works in the constant current region, the current transformer obtains the output current of the MOS tube, and adjusts the gate-source voltage V in real time through the negative feedback regulation of the current sampling unit and the driving unit. GS So that the second output terminal outputs a DC waveform with adjustable amplitude.

[0013] In one embodiment, the switch modulation module is further configured to periodically control the gate-source voltage V GS amplitude, so that the second output end outputs a periodic square wave waveform with adjustable amplitude.

[0014] In one embodiment, the voltage conversion module includes:

[0015] A voltage conversion unit, used for converting a DC voltage or AC voltage of an input original intensity into a DC voltage signal of the preset amplitude;

[0016] The signal filtering unit is connected to the voltage conversion unit and is used to filter out the clutter signal in the voltage signal of the preset amplitude and transmit it to the switch modulation module.

[0017] In one embodiment, the voltage conversion unit includes:

[0018] The AC-DC conversion unit is used to connect to the mains or wall power to rectify the AC voltage corresponding to the mains or wall power to output a DC voltage;

[0019] The DC-DC conversion unit is connected to the AC-DC conversion unit and is used to convert the DC voltage output by the AC-DC conversion unit into a DC voltage signal of the preset amplitude.

[0020] In one of the embodiments, the AC-DC conversion unit includes: an AC power supply, a first rectifier bridge, an inductor, a voltage stabilizing capacitor and a first switch;

[0021] The AC power supply is connected to the first rectifier bridge; the voltage-stabilizing capacitor is connected in series with the inductor and then connected in parallel with the first rectifier bridge; one side of the first switch is located between the inductor and the voltage-stabilizing capacitor, and the other side is located at the input end of the DC-DC conversion unit.

[0022] In one of the embodiments, the DC-DC conversion unit includes: a DC power supply, a second switch, an inverter bridge, a resonant inductor, a resonant capacitor, a step-up transformer, and a second rectifier bridge;

[0023] The DC power supply is connected in series with the second switch and then connected to the input end of the inverter bridge;

[0024] The output end of the inverter bridge is connected to the resonant inductor and the resonant capacitor, and the resonant inductor is connected to the input end of the resonant capacitor and the input end of the step-up transformer;

[0025] The output end of the step-up transformer is connected to the input end of the second rectifier bridge.

[0026] According to another aspect of the present invention, a control method for the multiplexed high-power power supply based on path modulation is provided, comprising:

[0027] By controlling the drain-source voltage V DS and the gate-source voltage V GS The difference is large enough to make the first output end output a DC waveform, or make the second output end output a pulse waveform or a square wave waveform.

[0028] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0029] (1) The present invention provides a multiplexed high-power power supply based on path modulation, comprising a voltage conversion module, a switch modulation module and a load access module; wherein the drain of the MOS tube in the switch modulation module is connected to the positive electrode of the voltage conversion module, the source of the MOS tube is connected to the input end of the current transformer; the gate of the MOS tube is connected to the output end of the driving unit; the output end of the current transformer is connected to the input end of the current sampling unit, and the output end of the current sampling unit is connected to the input end of the driving unit; by controlling the drain-source voltage V DS and the gate-source voltage V GS The difference is used to adjust the switching working mode of the switching modulation module, so that the first output end of the load access module connected to the positive pole of the voltage conversion module outputs a DC waveform, or the second output end of the load access module connected to the output end of the current transformer outputs a pulse waveform or a square wave waveform to power different loads, that is, a power supply with a topology structure can meet multiple output requirements; in addition, the voltage can reach 10kV level and the current can reach 10kA level, which is of great significance for the miniaturization and integration of power supplies under complex input power supplies and multi-type load conditions.

[0030] (2) In this scheme, when V GS <V th When the MOS tube works in the cut-off region and is not turned on, the first output terminal outputs a DC waveform. At this time, the first output terminal can be connected to a constant resistance load whose required current waveform is DC to supply power.

[0031] (3) In this scheme, when V GS ≥V th And V DS <V GS -V th When the MOS tube works in the variable resistance region, the drain-source voltage V GS If the current waveform is unchanged, the MOS tube is equivalent to a closed switch, and the second output terminal outputs a pulse waveform. At this time, the second output terminal can be connected to a constant resistance load whose current waveform is a pulse wave to supply power.

[0032] (4) In this scheme, when V GS ≥V th And V DS ≥V GS -V th When the MOS tube works in the constant current region, the current transformer obtains the output current of the MOS tube, and adjusts the gate-source voltage V in real time through the negative feedback regulation of the current sampling unit and the driving unit. GS So that the second output terminal outputs a DC waveform with adjustable amplitude. At this time, the second output terminal can be connected to a variable resistance load whose required current waveform is a square wave to supply power to it.

[0033] (5) In this scheme, the gate-source voltage V is periodically controlled. GS The amplitude is set so that the second output terminal outputs a periodic square wave waveform with adjustable amplitude. At this time, the second output terminal can be connected to a variable resistance load whose required current waveform is a periodic square wave to power it.

[0034] (6) In this solution, the voltage conversion of the voltage conversion unit enables the reused high-power power supply to operate under different forms of primary power supply conditions. In addition, the signal filtering unit filters redundant signals to improve the working stability of the reused high-power power supply.

[0035] (7) In this solution, the AC-DC conversion unit is connected to the mains or wall power and rectifies the AC voltage to output a DC voltage; the DC-DC conversion unit is connected to the DC voltage output by the AC-DC conversion unit or a DC power source such as a battery, outputs a DC voltage with adjustable amplitude, the voltage can reach 10kV, and is applied to the positive and negative poles of the signal filtering unit; the multiplexed high-power power supply can operate under different forms of primary power supply conditions.

[0036] (8) The AC-DC conversion unit in this solution includes: an AC power supply, a first rectifier bridge, an inductor, a voltage-stabilizing capacitor and a first switch. The advantage of such a design is that the AC power or wall power can be rectified to output a DC voltage, which is used as the input voltage of the DC-DC conversion unit.

[0037] (9) The DC-DC conversion unit in this solution includes: a DC power supply, a second switch, an inverter bridge, a resonant inductor, a resonant capacitor, a step-up transformer and a second rectifier bridge. The advantage of such a design is that the DC voltage output by the AC-DC conversion unit or a DC power supply such as a battery can be converted into a DC voltage of the amplitude required by the load, and the voltage can reach 10kV. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic block diagram of a multiplexed high-power power supply based on path modulation provided by Embodiment 1 of the present invention;

[0039] Figure 2 This is a structural diagram of a multiplexed high-power power supply based on path modulation provided by Embodiment 1 of the present invention;

[0040] Figure 3 This is an output characteristic curve of a MOS tube of a switch modulation module in a multiplexed high-power power supply based on path modulation provided in Embodiment 1 of the present invention.

[0041] Figure 4 This is a waveform diagram of a stable DC current output by a multiplexed high-power power supply based on path modulation provided in Example 1 of the present invention.

[0042] Figure 5 The embodiment 1 of the present invention provides a multiplexed high-power power supply based on path modulation to output a pulse current waveform and a voltage signal V on a MOS tube. GS Waveform graph.

[0043] Figure 6 The embodiment 1 of the present invention provides a multiplexed high-power power supply based on path modulation to output a continuous square wave current waveform and a voltage signal V on a MOS tube. GS Waveform graph. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0045] Example 1

[0046] This embodiment provides a multiplexed high-power power supply based on path modulation, such as Figure 1 As shown, it includes: a voltage conversion module, a switch modulation module 4 and a load access module 5; the voltage conversion module is used to convert the input voltage into a DC voltage signal of a preset amplitude; the switch modulation module 4 includes: a MOS tube, a diode, a current transformer, a current sampling unit and a drive unit; the MOS tube and the diode are connected in reverse parallel, and the drain of the MOS tube is connected to the positive electrode of the voltage conversion module, and the source of the MOS tube is connected to the input end of the current transformer; the gate of the MOS tube is connected to the output end of the drive unit; the output end of the current transformer is connected to the input end of the current sampling unit, and the output end of the current sampling unit is connected to the input end of the drive unit; the load access module 5 includes: a first output end and a second output end in different paths, the first output end is connected to the positive electrode of the voltage conversion module, and is used to output a DC waveform, and the second output end is connected to the output end of the current transformer, and is used to output a pulse waveform or a square wave waveform.

[0047] In one embodiment, the voltage conversion module includes: a voltage conversion unit and a signal filtering unit 3; the voltage conversion unit is used to convert the DC voltage or AC voltage of the input original intensity into a DC voltage signal of a preset amplitude; the signal filtering unit 3 is connected to the voltage conversion unit, and is used to filter out the noise signal in the voltage signal of the preset amplitude and transmit it to the switch modulation module 4.

[0048] In one embodiment, the voltage conversion unit includes: an AC-DC conversion unit 1 and a DC-DC conversion unit 2; the AC-DC conversion unit 1 is used to connect to the mains or wall power to rectify the AC voltage corresponding to the mains or wall power to output a DC voltage; the DC-DC conversion unit 2 is connected to the AC-DC conversion unit 1, or to a DC power source such as a battery, and is used to convert the DC voltage output by the AC-DC conversion unit 1 or the initial DC voltage of the battery or the like into a DC voltage signal of a preset amplitude.

[0049] In one embodiment, the AC-DC conversion unit 1 includes: an AC power supply, a first rectifier bridge, an inductor, a voltage-stabilizing capacitor and a first switch; the AC power supply is connected to the first rectifier bridge; the voltage-stabilizing capacitor is connected in series with the inductor and then in parallel with the first rectifier bridge; one side of the first switch is located between the inductor and the voltage-stabilizing capacitor, and the other side is located at the input end of the DC-DC conversion unit.

[0050] In one embodiment, the DC-DC conversion unit includes: a DC power supply, a second switch, an inverter bridge, a resonant inductor, a resonant capacitor, a boost transformer and a second rectifier bridge; the DC power supply is connected in series with the second switch and then connected to the input end of the inverter bridge; the output end of the inverter bridge is connected to the resonant inductor and the resonant capacitor, and the input ends of the resonant inductor and the resonant capacitor are connected to the input end of the boost transformer; the output end of the boost transformer is connected to the input end of the second rectifier bridge.

[0051] like Figure 1 As shown, this embodiment provides a multiplexed high-power power supply based on path modulation, including an AC-DC conversion unit 1, a DC-DC conversion unit 2, a signal filtering unit 3, a switch modulation module 4, and a load access module 5.

[0052] Specifically, the output end of the AC-DC conversion unit 1 is connected to the input end of the DC-DC conversion unit 2, the output end of the DC-DC conversion unit 2 is connected to the input end of the signal filtering unit 3, the output end of the signal filtering unit 3 is connected to the input end of the switch modulation module 5, the output end of the switch modulation module 4 is connected to the input end of the load access module 5, and the end of the load access module 5 is grounded. Among them, the AC-DC conversion unit 1 is connected to the mains or wall power; the AC-DC conversion unit 1 is used to rectify the AC voltage and output a DC voltage. The DC-DC conversion unit 2 is connected to the DC voltage output by the AC-DC conversion unit 1; in addition, the DC-DC conversion unit 2 can also be directly connected to a DC power source such as a solar panel or a battery; the DC-DC conversion unit 2 is used to output a DC voltage with adjustable amplitude and apply it to both ends of the signal filtering unit 3. The signal filtering unit 3 is used to store the electric energy output by the AC-DC conversion unit 1 or the DC-DC conversion unit 2. The switch modulation module 4 can switch the working state, output the electric energy of the signal filtering unit 3 to the load access module 5, and output a specified current waveform. The load access module 5 can be connected to different types of loads, and the load terminal is grounded.

[0053] Among them, Figure 2 As shown, the AC-DC conversion unit 1 includes: a power supply U in1 , diodes D1, D2, D3 and D4, inductor L1, voltage stabilizing capacitor C1 and switch S1; power supply U in1 One end of the output side is connected between diodes D1 and D2, and the other end is connected between diodes D3 and D4; the voltage-stabilizing capacitor C1 is connected in series with the inductor L1, and then connected in parallel with the diode D3 and D4 branches; one side of S1 is located between the L1 inductor and the voltage-stabilizing capacitor C1, and the other side is located at the input end of the DC-DC conversion unit 2.

[0054] Among them, Figure 2 As shown, the DC-DC conversion unit 2 includes: a power supply U in2 , switch S2, thyristors V1, V2, V3 and V4, diodes D5, D6, D7 and D8, resonant inductor L r , resonant capacitor C r , step-up transformer TX and diode D9, D 10 , D 11 and D 12 ; Power supply U in2 The switch S2 is connected in parallel with the thyristor V1 and V2 branches; the diodes D5, D6, D7 and D8 are connected in reverse parallel with the thyristors V1, V2, V3 and V4 respectively; the resonant inductor L r One end is connected between thyristors V1 and V2, and the other end is connected to the input end of the step-up transformer TX; the resonant capacitor C rOne end of the boost transformer is connected between thyristors V3 and V4, and the other end is connected to the input end of the boost transformer TX; one side of the output end of the boost transformer TX is connected to diodes D9 and D 11 The other side is connected to the diode D 10 and D 12 The step-up transformer TX has an adjustable transformation ratio and is used to output DC voltages of different amplitudes, up to 10kV.

[0055] Among them, Figure 2 As shown, the signal filtering unit 3 includes: a voltage-stabilizing large capacitor C2 and a diode D9; the diode D9 is connected in reverse parallel with the voltage-stabilizing large capacitor C2; and the input end of the voltage-stabilizing large capacitor C2 is connected to the inductor L1.

[0056] Among them, Figure 2 As shown, the switch modulation module 4 includes: a MOS tube, a diode D 14 , current transformer, current sampling unit and driving unit; MOS tube and diode D 14 Reverse parallel connection; the drain of the MOS tube is connected to the output end of the voltage-stabilizing large capacitor C2 of the signal filtering unit 3, the source of the MOS tube is connected to the switches S4 and S5 of the load access module 5, and the gate of the MOS tube is connected to the output end of the driving unit; the current transformer is connected in series between the source of the MOS tube and the switches S4 and S5 of the load access module 5; the input end of the current sampling unit is connected to the output end of the current transformer, and the output end of the current sampling unit is connected to the input end of the driving unit.

[0057] The working mode of the MOS tube of the switch modulation module 4 is as follows Figure 3 As shown. The MOEFET cut-off voltage is V th , when the drain-source voltage V DS <V th , the MOS tube works in the cut-off region and is not conducting; when V GS ≥V th , the MOS tube is turned on, when V DS >V GS -V th MOS tube works in the constant current region and can output a constant current. The current is determined by the gate-source voltage V GS Control; when V DS <V GS -V th , the MOS tube works in the saturated resistance area, and the resistance value is negligible relative to the load; the current transformer obtains the output current of the MOS tube, and adjusts the gate-source voltage V in real time through negative feedback regulation of the current sampling unit and the driving unit. GS The size of the MOS tube makes it work in the target mode and output a current with adjustable waveform and amplitude.

[0058] Among them, Figure 2As shown, when the load access module 5 is connected to different load resistors R1, R2 and R3, switches S3, S4 and S5 can be used to control it. Specifically, the constant resistor R1 is connected in series with the switch S3, the resistor R2 is connected in series with the switch S4, and the resistor R3 is connected in series with the switch S5; the switch S3 is connected to the output end of the voltage-stabilizing large capacitor C2 of the signal filtering unit 3; the switches S4 and S5 are respectively connected to the source of the MOS tube of the switch modulation module 4; and the low-voltage ends of the resistors R1, R2 and R3 are grounded.

[0059] In one embodiment, when the drain-source voltage V DS and the gate-source voltage V GS Meet V GS <V th When the MOS tube works in the cut-off region and does not conduct, the first output terminal outputs a DC waveform.

[0060] Specifically, the load R1 is a common resistor, and the required current waveform is DC. Close switch S3, and open switches S4 and S5. At this time, the load R1 is connected in parallel with the large voltage-stabilizing capacitor C2 of the energy storage unit 3, and the voltage and current waveforms of the load R1 are consistent with the voltage waveforms of the large voltage-stabilizing capacitor C2; if the input power supply is an AC power supply, close switch S1 and open switch S2; if the input power supply is a DC power supply, close switch S2 and open switch S1. The power supply voltage passes through the AC-DC conversion unit 1 and the DC-DC conversion unit 2 and is input to the load R1. The current waveform of R1 is a constant DC, and the output current waveform is as follows: Figure 4 shown.

[0061] In one embodiment, when the drain-source voltage V DS and the gate-source voltage V GS Meet V GS ≥V th And V DS <V GS -V th When the MOS tube works in the variable resistance area, the drain-source voltage V GS If the voltage remains unchanged, the MOS tube is equivalent to a closed switch, and the second output terminal outputs a pulse waveform.

[0062] Among them, load R2 is a common resistor, and the required current waveform is a pulse wave. Close switch S4, open switches S3 and S5, and load R2 is connected to the source of the MOS tube. If the input power supply is an AC power supply, close switch S1 and open switch S2. If the input power supply is a DC power supply, close switch S2 and open switch S1. The power supply voltage passes through AC-DC conversion unit 1 and DC-DC conversion unit 2 and is input to the voltage stabilizing large capacitor C2 of the signal filtering unit 3. Control the drain-source voltage V of the MOS tube DS and the gate-source voltage V GS , satisfying V GS≥V th , and V DS <V GS -V th MOS tube works in the variable resistance area, and the resistance value is negligible relative to the load R2, maintaining the input voltage signal V GS The MOS tube gate-source voltage V GS The waveform and corresponding output current waveform are as follows Figure 5 shown.

[0063] In one embodiment, when the MOS tube drain-source voltage V DS and the gate-source voltage V GS Meet V GS ≥V th And V DS ≥V GS -V th When the MOS tube works in the constant current region, the current transformer obtains the output current of the MOS tube, and adjusts the gate-source voltage V in real time through the negative feedback regulation of the current sampling unit and the driving unit. GS So that the second output terminal outputs a DC waveform with adjustable amplitude.

[0064] The load is a variable resistor, and the required current waveform is a repetitive square wave. Close switch S5, open switches S3 and S4, and the load R3 is connected to the source of the MOS tube. If the input power supply is an AC power supply, close switch S1 and open switch S2. If the input power supply is a DC power supply, close switch S2 and open switch S1. The power supply voltage passes through the AC-DC conversion unit 1 and the DC-DC conversion unit 2 and is input to the voltage-stabilizing large capacitor C2 of the signal filtering unit 3. When it needs to be turned on, the gate-source voltage V of the MOS tube is controlled. GS , satisfying V GS ≥V th , and V DS >V GS -V th MOS tube works in the constant current region, the current transformer obtains the output current of the MOS tube, and adjusts the gate-source voltage V in real time through negative feedback regulation of the current sampling unit and the driving unit. GS The output amplitude of the DC current waveform is adjustable; when it needs to be turned off, the gate-source voltage V of the MOS tube is controlled GS , satisfying V GS <V th , the MOS tube works in the cut-off region, there is no conductive channel, and the output current is 0.

[0065] In one embodiment, the switch modulation module 4 is further configured to periodically control the gate-source voltage V GS amplitude so that the second output terminal outputs a periodic square wave waveform with adjustable amplitude.

[0066] Example 2

[0067] This embodiment provides a control method for the multiplexed high-power power supply based on path modulation, comprising: controlling the drain-source voltage V DS and the gate-source voltage V GS The difference is large enough to make the first output end output a DC waveform, or make the second output end output a pulse waveform or a square wave waveform.

[0068] In one embodiment, the load R2 is a common resistor, and the required current waveform is a pulse wave. The switch S4 is closed, and the switches S3 and S5 are opened. At this time, the load R2 is connected to the source of the MOS tube. If the input power supply is an AC power supply, the switch S1 is closed and the switch S2 is opened. If the input power supply is a DC power supply, the switch S2 is closed and the switch S1 is opened. The power supply voltage passes through the AC-DC conversion unit 1 and the DC-DC conversion unit 2 and is input to the voltage stabilizing large capacitor C2 of the signal filtering unit 3. The drain-source voltage V of the MOS tube is controlled. DS and the gate-source voltage V GS , satisfying V GS ≥V th , and V DS <V GS -V th MOS tube works in the variable resistance area, and the resistance value is negligible relative to the load R2, maintaining the input voltage signal V GS The MOS tube gate-source voltage V GS The waveform and corresponding output current waveform are as follows Figure 5 shown.

[0069] In one embodiment, the load R2 is a common resistor, and the required current waveform is a pulse wave. The switch S4 is closed, and the switches S3 and S5 are opened. At this time, the load R2 is connected to the source of the MOS tube. If the input power supply is an AC power supply, the switch S1 is closed and the switch S2 is opened. If the input power supply is a DC power supply, the switch S2 is closed and the switch S1 is opened. The power supply voltage passes through the AC-DC conversion unit 1 and the DC-DC conversion unit 2 and is input to the voltage stabilizing large capacitor C2 of the signal filtering unit 3. The drain-source voltage V of the MOS tube is controlled. DS and the gate-source voltage V GS , satisfying V GS ≥V th , and V DS <V GS -V th MOS tube works in the variable resistance area, and the resistance value is negligible relative to the load R2, maintaining the input voltage signal V GS The MOS tube gate-source voltage V GSThe waveform and corresponding output current waveform are as follows Figure 5 shown.

[0070] In one embodiment, the load is a variable resistor, and the required current waveform is a repetitive square wave. The switch S5 is closed, and the switches S3 and S4 are opened. At this time, the load R3 is connected to the source of the MOS tube. If the input power supply is an AC power supply, the switch S1 is closed and the switch S2 is opened. If the input power supply is a DC power supply, the switch S2 is closed and the switch S1 is opened. The power supply voltage passes through the AC-DC conversion unit 1 and the DC-DC conversion unit 2 and is input to the voltage stabilizing large capacitor C2 of the signal filtering unit 3. When it needs to be turned on, the gate-source voltage V GS , satisfying V GS ≥V th , and V DS >V GS -V th MOS tube works in the constant current region, the current transformer obtains the output current of the MOS tube, and adjusts the gate-source voltage V in real time through negative feedback regulation of the current sampling unit and the driving unit. GS The output amplitude of the DC current waveform is adjustable; when it needs to be turned off, the gate-source voltage V of the MOS tube is controlled GS , satisfying V GS <V th , the MOS tube works in the cut-off region, there is no conductive channel, and the output current is 0.

[0071] In one embodiment, by repeatedly controlling the gate-source voltage V GS , can output repetitive square wave current with adjustable amplitude; MOS tube gate-source voltage V GS The waveform and corresponding output current waveform are as follows Figure 6 shown.

[0072] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multiplexed high-power power supply based on path modulation, characterized in that: include: A voltage conversion module, used for converting an input voltage into a DC voltage signal of a preset amplitude; A switch modulation module, comprising: a MOS tube, a diode, a current transformer, a current sampling unit and a driving unit; the MOS tube and the diode are connected in reverse parallel, and the drain of the MOS tube is connected to the positive electrode of the voltage conversion module, and the source of the MOS tube is connected to the input end of the current transformer; the gate of the MOS tube is connected to the output end of the driving unit; the output end of the current transformer is connected to the input end of the current sampling unit, and the output end of the current sampling unit is connected to the input end of the driving unit; The load access module includes: a first output end and a second output end in different paths, the first output end is connected to the positive pole of the voltage conversion module and is used to output a DC waveform, and the second output end is connected to the output end of the current transformer and is used to output a pulse waveform or a square wave waveform.

2. The multiplexed high-power power supply based on path modulation as claimed in claim 1, characterized in that: When the drain-source voltage V DS and the gate-source voltage V GS Meet V GS <V th When the MOS tube works in the cut-off region and is not turned on, the first output terminal outputs a DC waveform.

3. The multiplexed high-power power supply based on path modulation as claimed in claim 1, characterized in that: When the drain-source voltage V DS and the gate-source voltage V GS Meet V GS ≥V th And V DS <V GS -V th When the MOS tube works in the variable resistance region, the drain-source voltage V GS If the voltage remains unchanged, the MOS tube is equivalent to a closed switch, and the second output end outputs a pulse waveform.

4. The multiplexed high-power power supply based on path modulation as claimed in claim 1, characterized in that: When the MOS tube drain-source voltage V DS and the gate-source voltage V GS Meet V GS ≥V th And V DS ≥V GS -V th When the MOS tube works in the constant current region, the current transformer obtains the output current of the MOS tube, and adjusts the gate-source voltage V in real time through the negative feedback regulation of the current sampling unit and the driving unit. GS So that the second output terminal outputs a DC waveform with adjustable amplitude.

5. The multiplexed high-power power supply based on path modulation as claimed in claim 4, characterized in that: The switch modulation module is also used to periodically control the gate-source voltage V GS amplitude, so that the second output end outputs a periodic square wave waveform with adjustable amplitude.

6. The multiplexed high-power power supply based on path modulation as claimed in claim 1, characterized in that: The voltage conversion module comprises: A voltage conversion unit, used for converting a DC voltage or AC voltage of an input original intensity into a DC voltage signal of the preset amplitude; The signal filtering unit is connected to the voltage conversion unit and is used to filter out the clutter signal in the voltage signal of the preset amplitude and transmit it to the switch modulation module.

7. The multiplexed high-power power supply based on path modulation as claimed in claim 6, characterized in that: The voltage conversion unit comprises: The AC-DC conversion unit is used to connect to the mains or wall power to rectify the AC voltage corresponding to the mains or wall power to output a DC voltage; The DC-DC conversion unit is connected to the AC-DC conversion unit and is used to convert the DC voltage output by the AC-DC conversion unit into a DC voltage signal of the preset amplitude.

8. The multiplexed high-power power supply based on path modulation as claimed in claim 7, characterized in that: The AC-DC conversion unit includes: an AC power supply, a first rectifier bridge, an inductor, a voltage stabilizing capacitor and a first switch; The AC power supply is connected to the first rectifier bridge; the voltage-stabilizing capacitor is connected in series with the inductor and then connected in parallel with the first rectifier bridge; one side of the first switch is located between the inductor and the voltage-stabilizing capacitor, and the other side is located at the input end of the DC-DC conversion unit.

9. The multiplexed high-power power supply based on path modulation as claimed in claim 7, characterized in that: The DC-DC conversion unit includes: a DC power supply, a second switch, an inverter bridge, a resonant inductor, a resonant capacitor, a step-up transformer and a second rectifier bridge; The DC power supply is connected in series with the second switch and then connected to the input end of the inverter bridge; The output end of the inverter bridge is connected to the resonant inductor and the resonant capacitor, and the resonant inductor is connected to the input end of the resonant capacitor and the input end of the step-up transformer; The output end of the step-up transformer is connected to the input end of the second rectifier bridge.

10. A control method for a multiplexed high-power power source based on path modulation according to any one of claims 1 to 9, characterized in that: include: By controlling the drain-source voltage V DS and the gate-source voltage V GS The difference is large enough to make the first output end output a DC waveform, or make the second output end output a pulse waveform or a square wave waveform.

Images