Multiplexing high power supply and control method based on path modulation

Abstract

The present invention discloses a multiplexed high-power power supply based on path modulation, which belongs to the technical field of power supply design. The multiplexed high-power power supply includes: a voltage conversion module, a switch modulation module and a load access module; by controlling the drain-source voltage V DS and the gate-source voltage V GS The difference in value is used to adjust the switching mode of the switching modulation module, thereby causing the first output terminal to output a DC waveform, or the second output terminal to output a pulse waveform or a square wave waveform to power different loads. In other words, a power supply with one topology can meet multiple output requirements. In addition, the voltage can reach 10kV and the current can reach 10kA, which is of great significance for the miniaturization and integration of power supplies for complex input power supplies and multi-type load conditions. In addition, the voltage can reach 10kV and the current can reach 10kA, which is of great significance for the miniaturization and integration of power supplies for complex input power supplies and multi-type load conditions.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of power supply design, and more particularly to a multiplexing high-power power supply based on path modulation and a control method. BACKGROUND

[0002] The high-power power supply can output high voltage and large current after rectification, voltage boosting and inversion of different forms of electric energy, and is widely used in many fields such as electrostatic precipitation, military equipment and detection equipment, and is the core link of electric energy conversion.

[0003] The high-power power supply has great differences in the required output voltage and current waveforms when matched with different loads. For example, in the application of electrostatic precipitation, a stable DC high voltage with a voltage level of 10 kV is required; in the application of electromagnetic emission, a 10 kA level pulse large current is required, so the energy needs to be compressed in time scale to achieve instantaneous power multiplication; in the application of semiconductor laser, the laser works in pulse driving mode, and the rise and fall time of pulse emission determines the measurement accuracy, and the peak power of pulse determines the measurement range, so a high-power continuous square wave current is required, and a high-quality, high-power pulse laser driving circuit is essential.

[0004] However, the existing conventional power supply has a single output current waveform, and in the face of complex input power supply and multiple types of loads, multiple sets of power supplies with different topological structures need to be used to meet the complex output requirements, which is complex to operate and is not conducive to miniaturization and convenience development. SUMMARY

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

[0006] To achieve the above-mentioned purpose, according to one aspect of the present application, a multiplexing high-power power supply based on path modulation is provided, comprising:

[0007] A voltage conversion module for converting an input voltage into a DC voltage signal with 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 with the positive electrode of the voltage conversion module, and the source of the MOS tube is connected with the input end of the current transformer; the gate of the MOS tube is connected with the output end of the driving unit; the output end of the current transformer is connected with the input end of the current sampling unit, and the output end of the current sampling unit is connected with the input end of the driving unit;

[0009] The load access module comprises a first output end and a second output end in different paths, the first output end is connected with the positive pole of the voltage conversion module and is used for outputting a direct current waveform, and the second output end is connected with the output end of the current transformer and is used for outputting a pulse waveform or a square waveform.

[0010] In one embodiment, when the drain-source voltage V DS and the gate-source voltage V GS satisfy V GS <V th , the MOS tube works in the cut-off region and is not conductive, so that the first output end outputs a direct current waveform.

[0011] In one embodiment, when the drain-source voltage V DS and the gate-source voltage V GS satisfy V GS ≥V th and V DS <V GS -V th , the MOS tube works in the variable resistance region, and when the drain-source voltage V GS 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 drain-source voltage V DS and the gate-source voltage V GS satisfy V GS ≥V th and V DS ≥V GS -V th , the MOS tube works in the constant current region, the current transformer obtains the output current of the MOS tube, and the gate-source voltage V GS is adjusted in real time through the negative feedback regulation of the current sampling unit and the driving unit, so that the second output end outputs a direct current waveform with adjustable amplitude.

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

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

[0015] a voltage conversion unit, used for converting an input original intensity direct current voltage or alternating current voltage into a direct current voltage signal with a preset amplitude;

[0016] A signal filtering unit is connected with the voltage conversion unit, and is configured to filter out a noise signal in the voltage signal with the preset amplitude and transmit the voltage signal to the switch modulation module.

[0017] In one of the embodiments, the voltage conversion unit comprises:

[0018] An AC-DC conversion unit is configured to connect to a commercial power or a wall power, rectify an alternating voltage corresponding to the commercial power or the wall power, and output a direct current voltage.

[0019] A DC-DC conversion unit is connected with the AC-DC conversion unit, and is configured to convert the direct current voltage output by the AC-DC conversion unit into a direct current voltage signal with the preset amplitude.

[0020] In one of the embodiments, the AC-DC conversion unit comprises an alternating power source, a first rectifier bridge, an inductor, a voltage stabilizing capacitor, and a first switch.

[0021] The alternating power source is connected with the first rectifier bridge; the voltage stabilizing capacitor and the inductor are connected in series, and are 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 of the first switch is located at an input end of the DC-DC conversion unit.

[0022] In one of the embodiments, the DC-DC conversion unit comprises a direct current power source, a second switch, an inverter bridge, a resonant inductor, a resonant capacitor, a step-up transformer, and a second rectifier bridge.

[0023] The direct current power source is connected with the second switch in series, and is connected with an input end of the inverter bridge.

[0024] An output end of the inverter bridge is connected with the resonant inductor and the resonant capacitor; the resonant inductor is connected with an input end of the resonant capacitor and an input end of the step-up transformer.

[0025] An output end of the step-up transformer is connected with an input end of the second rectifier bridge.

[0026] According to another aspect of the present application, a control method of the multiplexing high-power power supply based on the path modulation is provided, and the control method comprises:

[0027] The difference between a drain-source voltage V DS and a gate-source voltage V GS of the MOS transistor is controlled to make the first output end output a direct current waveform, or make the second output end output a pulse waveform or a square waveform.

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

[0029] (1) The application provides a multiplexing 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 a MOS tube in the switch modulation module is connected with the anode of the voltage conversion module, the source of the MOS tube is connected with the input end of a current transformer; the gate of the MOS tube is connected with the output end of a driving unit; the output end of the current transformer is connected with the input end of a current sampling unit, and the output end of the current sampling unit is connected with the input end of the driving unit; the difference between the drain-source voltage V DS and the gate-source voltage V GS of the MOS tube is controlled to adjust the switch working mode of the switch modulation module, so that the first output end of the load access module connected with the anode of the voltage conversion module outputs a direct current waveform, or the second output end of the load access module connected with the output end of the current transformer outputs a pulse waveform or a square waveform, so as to supply power to different loads, that is, a power supply with a topology structure can meet the output requirements; in addition, the voltage can reach 10kV level, and the current can reach 10kA level, which has important significance for the miniaturization and integration of power supplies used in complex input power supplies and multiple load conditions.

[0030] (2) In the scheme, when V GS V th , the MOS tube works in the cutoff region and is not conductive, so that the first output end outputs a direct current waveform, and at this time, the first output end can be connected with a constant resistance load whose required current waveform is direct current, to supply power to the load.

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

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

[0033] (5) In this scheme, the amplitude of the gate-source voltage V GS of the second output end is adjusted to make the second output end output an amplitude-adjustable periodic square wave, and the second output end can be connected to a variable resistance load with a required current waveform of a periodic square wave to supply power.

[0034] (6) In this scheme, the voltage conversion of the voltage conversion unit can make the multiplexing high-power power supply work under different forms of primary power supply working conditions, and the signal filtering unit filters redundant signals to improve the working stability of the multiplexing high-power power supply.

[0035] (7) In this scheme, the AC-DC conversion unit connects the mains or wall power and rectifies the alternating voltage to output a direct current voltage; the DC-DC conversion unit connects the direct current voltage output by the AC-DC conversion unit or a battery as a direct current power supply, and outputs an amplitude-adjustable direct current voltage with a voltage of up to 10 kV and applied to the positive and negative electrodes of the signal filtering unit; and the multiplexing high-power power supply can work under different forms of primary power supply working conditions.

[0036] (8) In this scheme, the AC-DC conversion unit includes an alternating current power supply, a first rectifier bridge, an inductor, a voltage stabilizing capacitor, and a first switch; and the advantage of this design is that the mains or wall power can be rectified to output a direct current voltage for the input voltage of the DC-DC conversion unit.

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

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

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

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

[0041] Figure 4 is a graph of an output stable direct current waveform of a multiplexing high-power power supply based on path modulation provided by Embodiment 1 of the present application.

[0042] Figure 5 is a multiplexing high-power power supply output pulse current waveform based on path modulation and MOS tube voltage signal V GS waveform diagram.

[0043] Figure 6 is a multiplexing high-power power supply output continuous square wave current waveform based on path modulation and MOS tube voltage signal V GS waveform diagram. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0045] Embodiment 1

[0046] The present embodiment provides a multiplexing high-power power supply based on path modulation, as shown in Figure 1 including: 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 preset amplitude direct current voltage signal; the switch modulation module 4 includes: 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 anti-parallel, and the drain of the MOS tube is connected with the positive electrode of the voltage conversion module, and the source of the MOS tube is connected with the input end of the current transformer; the gate of the MOS tube is connected with the output end of the driving unit; the output end of the current transformer is connected with the input end of the current sampling unit, and the output end of the current sampling unit is connected with the input end of the driving 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 with the positive electrode of the voltage conversion module, and is used to output a direct current waveform, and the second output end is connected with 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 input original intensity direct current voltage or alternating current voltage into a preset amplitude direct current voltage signal; the signal filtering unit 3 is connected with the voltage conversion unit, and is used to filter out the noise signal in the preset amplitude voltage signal and transmit it to the switch modulation module 4.

[0048] In one of the embodiments, the voltage conversion unit comprises: 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 alternating voltage corresponding to the mains or wall power to output a direct current voltage; the DC-DC conversion unit 2 is connected to the AC-DC conversion unit 1 or a direct current power source such as a battery, and is used to convert the direct current voltage output by the AC-DC conversion unit 1 or the initial direct current voltage of the battery into a direct current voltage signal with a preset amplitude.

[0049] In one of the embodiments, the AC-DC conversion unit 1 comprises: an alternating current power source, a first rectifier bridge, an inductor, a voltage stabilizing capacitor and a first switch; the alternating current power source is connected to the first rectifier bridge; the voltage stabilizing capacitor is connected in series with the inductor and is 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 of the first switch is located at the input end of the DC-DC conversion unit.

[0050] In one of the embodiments, the DC-DC conversion unit comprises: a direct current power source, a second switch, an inverter bridge, a resonant inductor, a resonant capacitor, a step-up transformer and a second rectifier bridge; the direct current power source is connected in series with the second switch and is 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; the input end of the resonant inductor and the resonant capacitor is connected to 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.

[0051] As shown in Figure 1 , the embodiment provides a multiplexing high-power power supply based on path modulation, which comprises 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 of AC-DC converter unit 1 is connected to the input of DC-DC converter unit 2, which is connected to the input of signal filter unit 3. The output of signal filter unit 3 is connected to the input of switch modulation module 5, and the output of switch modulation module 4 is connected to the input of load access module 5. The load access module 5 is grounded. AC-DC converter unit 1 is connected to mains or wall power; it rectifies the AC voltage and outputs a DC voltage. DC-DC converter unit 2 is connected to the DC voltage output by AC-DC converter unit 1. Alternatively, DC-DC converter unit 2 can be directly connected to a DC power source such as a solar panel or battery. DC-DC converter unit 2 outputs a DC voltage with adjustable amplitude, which is applied to both ends of signal filter unit 3. Signal filter unit 3 stores the electrical energy output by either AC-DC converter unit 1 or DC-DC converter unit 2. Switch modulation module 4 can switch its operating state, outputting the electrical energy from signal filter unit 3 to load access module 5 and outputting a specified current waveform. The load access module 5 can be connected to different types of loads, and the load terminals are 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, 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 branch; one side of S1 is located between the inductor L1 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 diodes 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 thyristor is connected between V3 and V4, and the other end is connected to the input of the step-up transformer TX; one side of the output of the step-up transformer TX is connected to the 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, such as Figure 2 As shown, the signal filtering unit 3 includes: a large voltage-stabilizing capacitor C2 and a diode D9; the diode D9 is connected in anti-parallel to the large voltage-stabilizing capacitor C2; and the input end of the large voltage-stabilizing capacitor C2 is connected to the inductor L1.

[0056] Among them, such as Figure 2 As shown, the switch modulation module 4 includes: MOS tube, 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 large voltage-stabilizing 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 , 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 saturation 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 MOSFET makes the MOSFET work in the target mode and outputs a current with adjustable waveform and amplitude.

[0058] Among them, such as Figure 2As shown, the load access module 5 is connected with different load resistors R1, R2 and R3, and can be controlled by switches S3, S4 and S5. 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 with the output end of the large voltage stabilizing capacitor C2 of the signal filtering unit 3; the switches S4 and S5 are respectively connected with the source electrode 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 satisfy V GS ≥ V th , the MOS tube works in the cut-off region and is not conductive, so that the first output end outputs a direct current waveform.

[0060] Specifically, the load R1 is a normal resistor, and the required current waveform is a direct current. The switch S3 is closed, and the switches S4 and S5 are opened, so that the load R1 is connected in parallel with the large voltage stabilizing capacitor C2 of the energy storage unit 3. The voltage and current waveforms of the load R1 are consistent with the voltage waveform of the large voltage stabilizing capacitor C2. If the input power supply is an alternating current power supply, the switch S1 is closed and the switch S2 is opened. If the input power supply is a direct current power supply, the switch S2 is closed and the switch S1 is opened. The power supply voltage is input to the load R1 after passing through the AC-DC conversion unit 1 and the DC-DC conversion unit 2. The current waveform of the load R1 is a constant direct current, and the output current waveform is as shown in Figure 4 .

[0061] In one embodiment, when the drain-source voltage V DS and the gate-source voltage V GS satisfy V GS ≥ V th and V DS <V GS -V th , the MOS tube works in the variable resistance region, and the drain-source voltage V GS is kept unchanged. The MOS tube is equivalent to a closed switch, and the second output end outputs a pulse waveform.

[0062] Specifically, the load R2 is a normal resistor, and the required current waveform is a pulse. The switch S4 is closed, and the switches S3 and S5 are opened, so that the load R2 is connected with the source electrode of the MOS tube. If the input power supply is an alternating current power supply, the switch S1 is closed and the switch S2 is opened. If the input power supply is a direct current power supply, the switch S2 is closed and the switch S1 is opened. The power supply voltage is input to the large voltage stabilizing capacitor C2 of the signal filtering unit 3 after passing through the AC-DC conversion unit 1 and the DC-DC conversion unit 2. The drain-source voltage V DS and the gate-source voltage V GS of the MOS tube are controlled to satisfy V GS≥ V th , and V DS < V GS - V th , MOS works in the variable resistance region, and the resistance is negligible relative to the load R2, the input voltage signal V GS is kept unchanged, and MOS can be considered as a closed switch at this time. The MOS gate-source voltage V GS waveform and the corresponding output current waveform are shown in Figure 5 .

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

[0064] The load is a variable resistor, and the required current waveform is a repeating square wave. Close switch S5 and open switches S3 and S4, at this time the load R3 is connected to the MOS source. 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 is input to the voltage stabilizing capacitor C2 of the signal filtering unit 3 after passing through the AC-DC conversion unit 1 and the DC-DC conversion unit 2. When it is needed to be turned on, the MOS gate-source voltage V GS is controlled to satisfy V GS ≥ V th and V DS > V GS - V th , MOS works in the constant current region, the current transformer obtains the output current of MOS, and the size of the gate-source voltage V GS is adjusted in real time through the negative feedback regulation of the current sampling unit and the driving unit, so that a DC current waveform with adjustable amplitude is output; when it is needed to be turned off, the MOS gate-source voltage V GS is controlled to satisfy V GS < V th , MOS works in the cut-off region, there is no conduction channel, and the output current is 0.

[0065] In one embodiment, the switch modulation module 4 is also used to control the amplitude of the gate-source voltage V GS periodically, so that the second output end 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 between the values ​​of the first output terminal and the second output terminal is such that the first output terminal outputs a DC waveform, or the second output terminal outputs a pulse waveform or a square wave waveform.

[0068] In one embodiment, load R2 is a common resistor, and the required current waveform is a pulse wave. Switch S4 is closed, and switches S3 and S5 are opened. At this point, load R2 is connected to the source of the MOS transistor. If the input power supply is an AC power supply, switch S1 is closed, and switch S2 is opened. If the input power supply is a DC power supply, switch S2 is closed, and switch S1 is opened. The power supply voltage passes through the AC-DC converter unit 1 and the DC-DC converter unit 2 and is then input to the voltage-stabilizing capacitor C2 of the signal filter unit 3. The drain-source voltage V of the MOS transistor is controlled. DS and the gate-source voltage V GS , satisfying V GS ≥V th , and V DS <V GS -V th , the 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, load R2 is a common resistor, and the required current waveform is a pulse wave. Switch S4 is closed, and switches S3 and S5 are opened. At this point, load R2 is connected to the source of the MOS transistor. If the input power supply is an AC power supply, switch S1 is closed, and switch S2 is opened. If the input power supply is a DC power supply, switch S2 is closed, and switch S1 is opened. The power supply voltage passes through the AC-DC converter unit 1 and the DC-DC converter unit 2 and is then input to the voltage-stabilizing capacitor C2 of the signal filter unit 3. The drain-source voltage V of the MOS transistor is controlled. DS and the gate-source voltage V GS , satisfying V GS ≥V th , and V DS <V GS -V th , the 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 of the gate-source voltage V Figure 5 and the corresponding output current waveform are shown in Fig. 3.

[0070] In one embodiment, the load is a variable resistor, and the required current waveform is a repetitive square wave. Close switch S5 and open switches S3 and S4, so that the load R3 is connected to the source of the MOS transistor. If the input power supply is an AC power supply, close switch S1 and open switch S2, and if the input power supply is a DC power supply, close switch S2 and open switch S1. The power supply voltage is input to the large capacitor C2 of the signal filter unit 3 after passing through the AC-DC conversion unit 1 and the DC-DC conversion unit 2. When conduction is required, the gate-source voltage V GS of the MOS transistor is controlled to satisfy V GS >V th , and V DS >V GS -V th , so that the MOS transistor works in the constant current region. The output current of the MOS transistor is obtained by the current transformer, and the size of the gate-source voltage V GS is adjusted in real time by the negative feedback regulation of the current sampling unit and the driving unit, so that a DC current waveform with adjustable amplitude is output. GS When conduction is not required, the gate-source voltage V GS of the MOS transistor is controlled to satisfy V th <V GS , so that the MOS transistor works in the cut-off region without a conduction channel, and the output current is 0.

[0071] In one embodiment, the gate-source voltage V GS is repeatedly controlled, so that a repetitive square wave current with adjustable amplitude is output. The waveform of the gate-source voltage V GS and the corresponding output current waveform are shown in Fig. 3. Figure 6

[0072] Those skilled in the art will easily understand that the above description is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A multiplexed high-power power supply based on path modulation, characterized in that: include: A voltage conversion module, used to convert the input voltage into a DC voltage signal of a preset amplitude; A switch modulation module, comprising: a MOS transistor, a diode, a current transformer, a current sampling unit, and a drive unit; the MOS transistor and the diode are connected in reverse parallel, with the drain of the MOS transistor connected to the positive electrode of the voltage conversion module, the source of the MOS transistor connected to the input end of the current transformer; the gate of the MOS transistor connected to the output end of the drive unit; the output end of the current transformer connected to the input end of the current sampling unit, and the output end of the current sampling unit connected to the input end of the drive 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 according to claim 1, characterized in that: When the drain-source voltage of the MOS tube V DS and the gate-source voltage V GS Meet V GS <V th When the MOS tube operates in the cut-off region and does not conduct, the first output end outputs a DC waveform.

3. The multiplexed high-power power supply based on path modulation according to claim 1, characterized in that: When the drain-source voltage of the MOS tube 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 according to 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 according to claim 4, characterized in that: The switch modulation module is also used to periodically control the gate-source voltage V GS The amplitude of the second output terminal is adjusted so that the second output terminal outputs a periodic square wave waveform with adjustable amplitude.

6. The multiplexed high-power power supply based on path modulation according to claim 1, characterized in that: The voltage conversion module includes: A voltage conversion unit, configured to convert 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 the clutter signal to the switch modulation module.

7. The multiplexed high-power power supply based on path modulation according to claim 6, characterized in that: The voltage conversion unit includes: 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 according to 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 according to 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 supply 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 between the values ​​of the first output terminal and the second output terminal is set to be large enough to cause the first output terminal to output a DC waveform, or cause the second output terminal to output a pulse waveform or a square wave waveform.

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