Switching power supply, pulse multi-level voltage output device and control method thereof

Abstract

The application belongs to the technical field of power supply, and particularly relates to a switching power supply, a pulse multi-level voltage output device and a control method thereof. The device comprises multiple input power supply modules, a power supply conversion module, a current sampling module, a voltage output module and a master control module. Each input power supply module is connected with the current sampling module and the power supply conversion module respectively. The input end of the power supply conversion module is connected with the current sampling module. The output end of the power supply conversion module is connected with the voltage output module. The voltage output module is further connected with a load. The master control module is connected with the power supply conversion module and the current sampling module respectively. The pulse multi-level voltage output device introduces multiple direct current power supplies through multiple input power supply modules. The high-speed switching of the power supply conversion module and the rectification of the voltage output module are adopted to achieve the purpose of realizing the pulse level of the multi-mode voltage output to the load. The current sampling module is adopted to improve the safety and reliability of the pulse multi-level voltage output device.

Description

Technical Field

[0001] The present application belongs to the field of power supply technology, and in particular relates to a switching power supply, a pulse multi-level voltage output device and a control method thereof. Background Art

[0002] At present, the level pulse output circuit has only one fixed power supply, which relies on the duty cycle to adjust the power supply output voltage. It can only output a single-mode voltage and cannot achieve multi-mode voltage output. As a result, this type of level pulse output circuit causes a lot of inconvenience in fields such as industry and medical testing that require multi-mode voltage. In addition, the overcurrent protection detection circuit of this type of level pulse output circuit requires a specific overcurrent detection chip, which leads to the problem of high price of this level pulse output circuit. Moreover, the existing overcurrent detection circuit can only detect the overcurrent phenomenon of a single switching tube, and cannot detect the overcurrent of multiple switching tubes and the system. On top of this, due to the limitation of the chip detection speed, the circuit system responds slowly to fault problems and cannot protect the subsequent circuit modules in time, which reduces the safety and reliability of the system and causes a lot of inconvenience in the design of the power protection circuit. Summary of the Invention

[0003] An embodiment of the present application provides a switching power supply, a pulse multi-level voltage output device and a control method thereof to solve the problem that the existing level pulse output circuit can only output a single-mode voltage and cannot achieve multi-mode voltage output.

[0004] In a first aspect, an embodiment of the present application provides a pulse multi-level voltage output device, comprising: multiple input power modules, a power conversion module, a current sampling module, a voltage output module and a main control module, each of the input power modules is respectively connected to the current sampling module and the power conversion module, the input end of the power conversion module is connected to the current sampling module, the output end of the power conversion module is connected to the voltage output module, the voltage output module is also connected to a load, and the main control module is respectively connected to the power conversion module and the current sampling module;

[0005] The input power module is used to provide DC power to the power conversion module;

[0006] The power conversion module is used to convert the voltage of the DC power supply into a pulse level of a multi-mode voltage;

[0007] The current sampling module is used to collect the current input to the power conversion module and generate a driving output signal according to the current;

[0008] The main control module is used to control the power conversion module to output a plurality of pulse level voltages of different voltages according to the drive output signal;

[0009] The voltage output module is used to isolate and transform the pulse-level voltage output by the power conversion module and then output it to the load.

[0010] Optionally, each of the input power modules includes a DC power supply and a freewheeling element connected in parallel with the DC power supply.

[0011] Optionally, the current sampling module includes a current sampling element, a first rectifier element and a signal generating unit, the first end of the primary side of the current sampling element is connected to each of the input power modules, the second end of the primary side of the current sampling element is connected to the power conversion module, the secondary side of the current sampling element is connected to the input end of the first rectifier element, the output end of the first rectifier element is connected to the input end of the signal generating unit, and the output end of the signal generating unit is connected to the main control module.

[0012] Optionally, the signal generating unit includes a first follower element, a comparison element, a second follower element and a signal generating element composed of four NOR gate elements. The first rectifier element is respectively connected in parallel with the first capacitor and the first resistor, and then in series with the second resistor and then connected to the positive input terminal of the first follower element. The output terminal of the first follower element is respectively connected to the negative input terminal of the first follower element and the third resistor. The third resistor is also connected to the third capacitor and the fourth resistor. The fourth resistor is also connected to the positive input terminal of the comparison element. The negative input terminal of the comparison element is respectively connected to the fifth resistor and the sixth resistor. The output terminal of the comparison element is connected to the positive input terminal of the second follower element through the eighth resistor. The output terminal of the second follower element is respectively connected to the negative input terminal of the second follower element and the signal generating element. The signal generating element is connected to the main control module. The signal generating element is used to generate four drive signals according to the signal output by the second follower element through each of the NOR gate elements.

[0013] Optionally, the main control module includes multiple driver chips, each of which is connected to the output end of the signal generating element, and each of which is used to output a driving output signal to the first end and the second end of the switching tube in the power conversion module.

[0014] Optionally, the power conversion module includes a first switching tube, a second switching tube, a third switching tube and a fourth switching tube. The third end of the second switching tube is connected to the first end of the primary side of the current sampling element, the third end of the fourth switching tube is connected to the second end of the primary side of the current sampling element, the second end of the second switching tube is respectively connected to the main control module, the voltage output module and the third end of the first switching tube, the second end of the fourth switching tube is respectively connected to the main control module, the voltage output module and the third end of the third switching tube, the second end of the first switching tube is respectively connected to the main control module and each of the input power modules, the second end of the third switching tube is respectively connected to the main control module and each of the input power modules, and the first end of the first switching tube, the first end of the second switching tube, the first end of the third switching tube and the first end of the fourth switching tube are all connected to the main control module.

[0015] Optionally, the voltage output module includes a first current mutual inductance element, a second current mutual inductance element, a second capacitor, an inductor, a transformer and a second rectifier element, the first end of the first current mutual inductance element is respectively connected to the second end of the fourth switching tube and the third end of the third switching tube, the second end of the first current mutual inductance element is connected to the first end of the primary winding in the transformer through the second capacitor and the inductor, the second end of the primary winding in the transformer is respectively connected to the second end of the second switching tube and the third end of the first switching tube, the secondary winding of the transformer is connected to the input end of the second rectifier element, the first output end of the second rectifier element is connected to the first end of the load through the second current mutual inductance element, and the second output end of the second rectifier element is connected to the second end of the load.

[0016] In a second aspect, an embodiment of the present application provides a control method for a pulse multi-level voltage output device, which is applied to the pulse multi-level voltage output device described above. The control method includes:

[0017] Acquiring the current input to the power conversion module through the current sampling module of the pulse multi-level voltage output device;

[0018] Processing the current using a signal generating unit to obtain a plurality of driving signals;

[0019] According to all the driving signals, multiple driving chips of the main control module are used to generate driving output signals for controlling the first and second ends of each switch tube in the power conversion module;

[0020] The operation of each switch tube in the power conversion module is controlled according to all the driving output signals, so that the power conversion module outputs a plurality of pulse level voltages of different voltages.

[0021] Optionally, controlling the operation of each switch tube in the power conversion module according to all the drive output signals so that the power conversion module outputs a plurality of pulse level voltages of different voltages includes:

[0022] If the first switch tube and the fourth switch tube in the power conversion module are controlled to be turned on according to all the driving output signals, the pulse level voltage output by the power conversion module to the voltage output module is the first voltage;

[0023] If the second switch tube and the third switch tube in the power conversion module are controlled to be turned on according to all the driving output signals, the pulse level voltage output by the power conversion module to the voltage output module is the second voltage;

[0024] If all the switch tubes in the power conversion module are controlled to be turned on according to all the driving output signals, the power conversion module outputs a pulse multi-level voltage composed of the superposition of the first voltage and the second voltage to the voltage output module.

[0025] In a second aspect, an embodiment of the present application provides a switching power supply, comprising the pulse multi-level voltage output device described above.

[0026] An embodiment of the present application provides a switching power supply, a pulse multi-level voltage output device and a control method thereof. The pulse multi-level voltage output device includes multiple input power modules, a power conversion module, a current sampling module, a voltage output module and a main control module. Each input power module is respectively connected to the current sampling module and the power conversion module, the input end of the power conversion module is connected to the current sampling module, the output end of the power conversion module is connected to the voltage output module, the voltage output module is also connected to the load, and the main control module is respectively connected to the power conversion module and the current sampling module; the input power module is used to provide a DC power supply to the power conversion module; the power conversion module is used to convert the voltage of the DC power supply into a pulse level of a multi-mode voltage; the current sampling module is used to collect the current input to the power conversion module and generate a drive output signal according to the current; the main control module is used to control the power conversion module to output multiple pulse level voltages of different voltages according to the drive output signal; the voltage output module is used to isolate and transform the voltage of the pulse level output of the power conversion module before outputting it to the load. This pulse multi-level voltage output device introduces multiple DC power supplies through multiple input power modules, adopts high-speed switching of the power conversion module and rectification of the voltage output module to achieve the purpose of outputting pulse levels of multi-mode voltage to the load, and adopts a current sampling module to improve the safety and reliability of the pulse multi-level voltage output device, solving the problem that the existing level pulse output circuit can only output single-mode voltage and cannot achieve multi-mode voltage output.

[0027] The control method of the pulse multi-level voltage output device achieves the purpose of outputting a pulse multi-level voltage.

[0028] The switching power supply realizes bus multi-mode voltage and current output, and implements overcurrent detection through dual primary current transformers as current sampling elements. It not only has a fast response speed, but also realizes the function of protecting cross current, through current and power system current. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] To more clearly illustrate the technical solution in one embodiment of the present application, the following briefly introduces the drawings required for describing the embodiment. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0030] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings. In the following description, the same reference numerals represent the same parts.

[0031] Figure 1 A schematic diagram of a framework of a pulse multi-level voltage output device provided in one embodiment of the present application.

[0032] Figure 2 A circuit diagram of a pulse multi-level voltage output device provided in one embodiment of the present application.

[0033] Figure 3 A circuit diagram of a current sampling module in a pulse multi-level voltage output device provided in one embodiment of the present application.

[0034] Figure 4 A circuit diagram of a first switch tube and a fourth switch tube of a power conversion module in a pulse multi-level voltage output device provided by an embodiment of the present application being turned on is provided.

[0035] Figure 5 A circuit diagram of the second switch tube and the third switch tube of the power conversion module in the pulse multi-level voltage output device provided by one embodiment of the present application is turned on.

[0036] Figure 6 A voltage waveform diagram of a pulse multi-level voltage output device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in one embodiment of the present application to clearly and completely describe the technical solution in one embodiment of the present application. Obviously, the described embodiment is only a part of the embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

[0038] One embodiment of the present application provides a switching power supply, a pulsed multi-level voltage output device, and a control method thereof to address the problem that existing level pulse output circuits can only output a single-mode voltage and cannot achieve multi-mode voltage output. This switching power supply, pulsed multi-level voltage output device, and control method thereof are applicable to switching power supplies such as high-frequency pulse switching power supplies and high-power DC switching power supplies; specifically, they are suitable for current balancing in parallel with high-frequency pulse switching power supplies and voltage balancing in series with high-frequency pulse switching power supplies.

[0039] Example 1:

[0040] An embodiment of the present application provides a pulse multi-level voltage output device, for example, see Figure 1 , Figure 1 A schematic diagram of a pulse multi-level voltage output device according to an embodiment of the present application is provided. Figure 2 A circuit diagram of a pulse multi-level voltage output device provided in one embodiment of the present application.

[0041] like Figure 1 and Figure 2 As shown, the present invention provides a pulse multi-level voltage output device, including multiple input power modules 10, power conversion modules 20, current sampling modules 30, voltage output modules 40 and main control modules 50. Each input power module 10 is connected to the current sampling module 30 and the power conversion module 20 respectively, the input end of the power conversion module 30 is connected to the current sampling module 30, the output end of the power conversion module 20 is connected to the voltage output module 40, the voltage output module 40 is also connected to the load Load, and the main control module 50 is connected to the power conversion module 20 and the current sampling module 30 respectively.

[0042] It is further explained that the pulse multi-level voltage output device realizes the pulse level of output multi-mode voltage by introducing multiple DC power supplies, with fast response speed and low cost. The function of protecting cross current, through current and system current is realized by the current sampling module. In this embodiment, the pulse multi-level voltage output device introduces multiple DC power supplies through multiple input power modules 10, adopts the high-speed switching of the power conversion module 20 and the rectification of the voltage output module 40 to achieve the purpose of outputting the pulse level of the multi-mode voltage to the load Load, wherein the current sampling module 30 is added to improve the safety and reliability of the pulse multi-level voltage output device.

[0043] In the embodiment of the invention of the application, the input power module 10 is used to provide DC power to the power conversion module 20.

[0044] It is further explained that each input power module 10 includes a DC power supply and a freewheeling element connected in parallel with the DC power supply. The DC power supply includes but is not limited to an adjustable DC power supply and a fixed DC power supply. The freewheeling element is used to release the residual electromotive force in the circuit of the pulse multi-level voltage output device. The freewheeling element can be selected as a diode, and the diode type includes but is not limited to a fast recovery diode and a Schottky diode. In this embodiment, Figure 2 As shown, the pulse multi-level voltage output device includes two input power modules 10, which are respectively denoted as a first input power module and a second power input module. The first power input module includes a DC power supply E1 and a freewheeling element D1 connected in parallel with the DC power supply E1, and the second power input module includes a DC power supply E2 and a freewheeling element D2 connected in parallel with the DC power supply E2.

[0045] In the embodiment of the invention of the application, the power conversion module 20 is used to convert the voltage of the DC power supply into a pulse level of a multi-mode voltage.

[0046] In the embodiment of the invention of the application, the current sampling module 30 is used to collect the current Ise1 input to the power conversion module 20 and generate a driving output signal according to the current Ise1.

[0047] In the embodiment of the invention of the application, the main control module 50 is used to control the power conversion module 20 to output a plurality of pulse level voltages of different voltages according to the driving output signal.

[0048] In the embodiment of the invention of the application, the voltage output module 40 is used to isolate and transform the pulse-level voltage output by the power conversion module 20 and then output it to the load Load.

[0049] An embodiment of the present application provides a pulse multi-level voltage output device, including multiple input power modules, power conversion modules, current sampling modules, voltage output modules and a main control module, each input power module is respectively connected to the current sampling module and the power conversion module, the input end of the power conversion module is connected to the current sampling module, the output end of the power conversion module is connected to the voltage output module, the voltage output module is also connected to the load, and the main control module is respectively connected to the power conversion module and the current sampling module; the input power module is used to provide a DC power supply to the power conversion module; the power conversion module is used to convert the voltage of the DC power supply into a pulse level of a multi-mode voltage; the current sampling module is used to collect the current input to the power conversion module and generate a drive output signal according to the current; the main control module is used to control the power conversion module to output multiple pulse level voltages of different voltages according to the drive output signal; the voltage output module is used to isolate and transform the voltage of the pulse level output of the power conversion module before outputting it to the load. This pulse multi-level voltage output device introduces multiple DC power supplies through multiple input power modules, adopts high-speed switching of the power conversion module and rectification of the voltage output module to achieve the purpose of outputting pulse levels of multi-mode voltage to the load, and adopts a current sampling module to improve the safety and reliability of the pulse multi-level voltage output device, solving the problem that the existing level pulse output circuit can only output single-mode voltage and cannot achieve multi-mode voltage output.

[0050] Figure 3 A circuit diagram of a current sampling module in a pulse multi-level voltage output device provided in one embodiment of the present application. Figure 3 The REF in it represents the reference voltage of 15V.

[0051] like Figure 2 and Figure 3 As shown, in the embodiment of the invention of the application, the current sampling module 30 includes a current sampling element T2, a first rectifying element D3 and a signal generating unit. The first end of the primary side of the current sampling element T2 is connected to each input power module 10, the second end of the primary side of the current sampling element T2 is connected to the power conversion module 20, the secondary side of the current sampling element T2 is connected to the input end of the first rectifying element D3, the output end of the first rectifying element D3 is connected to the input end of the signal generating unit, and the output end of the signal generating unit is connected to the main control module 50.

[0052] It is further explained that the current sampling element T2 can be selected as a dual primary current transformer, which is used to sample and detect the current flowing through the dual primary current transformer. The main control module 50 can perform overcurrent cut-off circuit protection according to the current used. The first rectifier element D3 can be selected as a rectifier bridge. Figure 2 As shown, the primary side of the current sampling element T2 is connected to the freewheeling element.

[0053] like Figure 3 As shown, in the embodiment of the invention of the application, the signal generating unit includes a first follower element U1, a comparison element U2, a second follower element U3 and a signal generating element composed of four NOR gate elements. The first rectifier element D3 is respectively connected in parallel with the first capacitor C1 and the first resistor R1, and then connected in series with the second resistor R2 and then connected to the positive input terminal of the first follower element U1. The output terminal of the first follower element U1 is respectively connected to the negative input terminal of the first follower element U1 and the third resistor R3. The third resistor R3 is also connected to the third capacitor C3 and the fourth resistor R4. The fourth Resistor R4 is also connected to the positive input terminal of the comparison element U2. The negative input terminal of the comparison element U2 is respectively connected to the fifth resistor R5 and the sixth resistor R6. The output terminal of the comparison element U2 is connected to the positive input terminal of the second follower element U3 through the eighth resistor R8. The output terminal of the second follower element U3 is respectively connected to the negative input terminal of the second follower element U3 and the signal generating element. The signal generating element is connected to the main control module 10. The signal generating element is used to generate four drive signals based on the signal output by the second follower element U3 through each NOR gate element. The main control module includes multiple driver chips, each of which is connected to the output terminal of the signal generating element. Each driver chip is used to output a drive output signal to the first and second terminals of the switching tube in the power conversion module 20.

[0054] To further illustrate, the first follower element U1 can be a TL084A follower. The comparison element U2 can be an LM211 comparator. The second follower element U3 can be a TL084B follower. The signal generation element includes four NOR gates: CD4001A NOR gate U4, CD4001B NOR gate U5, CD4001C NOR gate U6, and CD4001D NOR gate U7. The signal generation unit operates as follows: current fluctuations pass through the dual-primary current transformer T2, generating a sampled current signal Ise1. This current signal Ise1 is input to the positive terminal of the first follower element U1. After filtering, it is input to the positive terminal of the comparison element U2. The negative terminal of the comparison element U2 receives a reference voltage divided by 15V. The voltages at the positive and negative terminals of the comparison element U2 are compared, and the comparison output is input to the positive terminal of the second follower element U3. The second follower element U3 outputs signal G, which passes through four NOR gates to produce four drive signals, designated DR1, DR2, DR3, and DR4. If the collected current signal Ise1 exhibits an abnormality, it passes through the first follower element U1 and then into the comparison element U2. Comparison element U2 outputs a high-level signal, pulling signal G high. Signal G then passes through NOR gates U4, U5, U6, and U7, outputting a low level. Consequently, the output drive signals DR1, DR2, DR3, and DR4 are all low-level signals.

[0055] like Figure 2 As shown, in the embodiment of the invention of the application, the power conversion module 20 includes a first switch tube Q1, a second switch tube Q2, a third switch tube Q3 and a fourth switch tube Q4. The third end of the second switch tube Q2 is connected to the first end of the primary side of the current sampling element T2, and the third end of the fourth switch tube Q4 is connected to the second end of the primary side of the current sampling element T2. The second end of the second switch tube Q2 is respectively connected to the main control module 50, the voltage output module 40 and the third end of the first switch tube Q1. The second end of the fourth switch tube Q4 is respectively connected to the main control module 50, the voltage output module 40 and the third end of the third switch tube Q3. The second end of the first switch tube Q1 is respectively connected to the main control module 50 and each input power module 10. The second end of the third switch tube Q3 is respectively connected to the main control module 50 and each input power module 10. The first end of the first switch tube Q1, the first end of the second switch tube Q2, the first end of the third switch tube Q3 and the first end of the fourth switch tube Q4 are all connected to the main control module 10.

[0056] It should be further noted that two switching transistors connected in a half-bridge push-pull configuration are used as a basic unit in the power conversion module 20. The number of basic units is not limited and matches the DC power supply used. The switching transistors used in the power conversion module 20 may include, but are not limited to, IGBTs, programmable switches, gallium nitride MOS transistors, silicon carbide MOS transistors, etc. In this embodiment, the switching transistors may be MOS transistors, with the gate of the MOS transistor serving as the first terminal of the switching transistor, the source of the MOS transistor serving as the second terminal of the switching transistor, and the drain of the MOS transistor serving as the third terminal of the switching transistor.

[0057] like Figure 3 As shown, in the embodiment of the invention of the application, the two pin connection ends of the signal generating element for outputting the driving signals DR1 and DR2 are connected to the driver chip IC1 and the driver chip IC2, respectively; the two pin connection ends of the signal generating element for outputting the driving signals DR3 and DR4 are connected to the driver chip IC3 and the driver chip IC4, respectively. The pin connection ends of the driver chip IC1 for outputting the driving output signals G1 and e1 are connected to the first terminal G1 and the third terminal e1 of the first switch transistor Q1, respectively; the pin connection ends of the driver chip IC2 for outputting the driving output signals G2 and e2 are connected to the first terminal G2 and the third terminal e2 of the second switch transistor Q2, respectively; the pin connection ends of the driver chip IC3 for outputting the driving output signals G3 and e3 are connected to the first terminal G3 and the third terminal e3 of the third switch transistor Q3, respectively; and the pin connection ends of the driver chip IC4 for outputting the driving output signals G4 and e4 are connected to the first terminal G4 and the third terminal e4 of Q4, respectively.

[0058] like Figure 2 As shown, in the embodiment of the invention of the application, the voltage output module 40 includes a first current mutual induction element A1, a second current mutual induction element A2, a second capacitor C2, an inductor L1, a transformer T1 and a second rectifier element D4. The first end of the first current mutual induction element A1 is respectively connected to the second end of the fourth switch tube Q4 and the third end of the third switch tube Q3, the second end of the first current mutual induction element A1 is connected to the first end of the primary winding in the transformer T1 through the second capacitor C2 and the inductor L1, the second end of the primary winding in the transformer T1 is respectively connected to the second end of the second switch tube Q2 and the third end of the first switch tube Q1, the secondary winding of the transformer T1 is connected to the input end of the second rectifier element D4, the first output end of the second rectifier element D4 is connected to the first end of the load Load through the second current mutual induction element A2, and the second output end of the second rectifier element D4 is connected to the second end of the load Load.

[0059] It is further explained that the first current mutual inductance element A1 and the second current mutual inductance element A2 can both be current transformers, and the second rectifier element D4 can both be rectifier bridges.

[0060] Figure 4 This is a circuit diagram of a first switch tube and a fourth switch tube of a power conversion module in a pulse multi-level voltage output device provided by an embodiment of the present application being turned on. Figure 5 This is a circuit diagram of a second switch tube and a third switch tube of a power conversion module in a pulse multi-level voltage output device provided by an embodiment of the present application being turned on. Figure 6 This is a voltage waveform diagram of a pulse multi-level voltage output device provided by an embodiment of the present application. Figure 4 The circuit diagram shows the primary side of transformer T1 outputting a 300V pulse level. Figure 5 The diagram shows the circuit diagram of the primary side of transformer T1 outputting a 500V pulse level. Figure 6 , A1 represents the voltage waveform flowing through the first current mutual inductance element A1, A2 represents the voltage waveform flowing through the second current mutual inductance element A2, DR1 is the voltage waveform of the output drive signal DR1, DR2 is the voltage waveform of the output drive signal DR2, DR3 is the voltage waveform of the output drive signal DR3, and DR4 is the voltage waveform of the output drive signal DR4.

[0061] like Figure 2 、 Figure 4 、 Figure 5 and Figure 6 As shown in the embodiment of the invention of the application, the pulse multi-level voltage output device includes two sets of DC power supplies, one set is a 500V DC power supply E1, and the other set is a 300V DC power supply E2. The driving pulse signal is transmitted to the first end of the switch tube of the power conversion module 20, such as Figure 4 As shown in FIG, when the first switch tube Q1 and the fourth switch tube Q4 are driven to conduct, the primary side of the transformer T1 outputs a pulse level of 300V. Figure 5 As shown in FIG, when the second switch tube Q2 and the third switch tube Q3 are turned on, the primary side of the transformer T1 outputs a pulse level of 500V. The square wave pulse signals generated by the primary side of the transformer T1 are superimposed, and the output signal is as follows Figure 6 As shown in A1. After passing through the second rectifier element D4 on the secondary side of the transformer, the rectifier output is given to the load Load, so that the pulse multi-level voltage output device outputs to the load Load a multi-level pulse waveform voltage consisting of 300V and 500V. The output pulse signal corresponding to the voltage of the multi-level pulse waveform is as follows: Figure 6 As shown in A2.

[0062] This pulsed multi-level voltage output device uses multiple DC power supplies simultaneously, combined with switching transistors to achieve multi-mode voltage and current output. This device is fast and low-cost, reducing the power consumption of individual switching transistors while improving circuit power tolerance and system reliability. This pulsed multi-level voltage output device implements bus multi-mode voltage and current output, and uses dual-primary current transformers as current sampling elements for overcurrent detection. This device not only provides fast response speed but also protects against cross-current, shoot-through, and system current.

[0063] Example 2:

[0064] The present invention further provides a control method for a pulse multi-level voltage output device, which is used in the above-mentioned pulse multi-level voltage output device. The control method includes the following steps:

[0065] The current input to the power conversion module is obtained by a current sampling module of a pulse multi-level voltage output device;

[0066] A signal generating unit is used to process the current to obtain a plurality of driving signals;

[0067] According to all driving signals, multiple driving chips of the main control module are used to generate driving output signals for controlling the first and second ends of each switch tube in the power conversion module;

[0068] The operation of each switch tube in the power conversion module is controlled according to all the driving output signals, so that the power conversion module outputs a plurality of pulse level voltages of different voltages.

[0069] It is further noted that the contents of the pulse multi-level voltage output device have been described in Example 1 and will not be repeated in this embodiment. The control method of the pulse multi-level voltage output device achieves the purpose of outputting a pulse multi-level voltage.

[0070] In an embodiment of the invention of the application, the operation of each switch tube in the power conversion module is controlled according to all driving output signals so that the power conversion module outputs multiple pulse level voltages of different voltages, including:

[0071] If the first switch tube and the fourth switch tube in the power conversion module are turned on and the second switch tube and the third switch tube are turned off according to all the driving output signals, the pulse level voltage output by the power conversion module to the voltage output module is the first voltage;

[0072] If the second switch tube and the third switch tube in the power conversion module are turned on and the first switch tube and the fourth switch tube are turned off according to all the driving output signals, the pulse level voltage output by the power conversion module to the voltage output module is the second voltage;

[0073] If all the switches in the power conversion module are controlled to be turned on according to all the driving output signals, the power conversion module outputs a pulse multi-level voltage composed of the superposition of the first voltage and the second voltage to the voltage output module.

[0074] It is further explained that the first voltage may be 300V, and the second voltage may be 500V.

[0075] Example 3:

[0076] The present invention further provides a switching power supply including the above-mentioned pulse multi-level voltage output device.

[0077] The details of this pulsed multi-level voltage output device have been described in Example 1 and will not be repeated here. This switching power supply implements multi-mode bus voltage and current outputs and uses dual primary current transformers as current sampling elements for overcurrent detection. This not only provides a fast response speed but also protects against cross-current, shoot-through current, and power system current.

[0078] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0079] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more features.

[0080] The above is a detailed introduction to the pulse multi-level voltage output device provided by an embodiment of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for technical personnel in this field, based on the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A pulse multi-level voltage output device, characterized in that: include: Multiple input power modules, power conversion modules, current sampling modules, voltage output modules and main control modules, each of the input power modules is respectively connected to the current sampling module and the power conversion module, the input end of the power conversion module is connected to the current sampling module, the output end of the power conversion module is connected to the voltage output module, the voltage output module is also connected to the load, and the main control module is respectively connected to the power conversion module and the current sampling module; The input power module is used to provide DC power to the power conversion module; The power conversion module is used to convert the voltage of the DC power supply into a pulse level of a multi-mode voltage; The current sampling module is used to collect the current input to the power conversion module and generate a driving output signal according to the current; The main control module is used to control the power conversion module to output a plurality of pulse level voltages of different voltages according to the drive output signal; The voltage output module is used to isolate and transform the pulse-level voltage output by the power conversion module and then output it to the load; The current sampling module includes a current sampling element, a first rectifier element, and a signal generating unit. The first end of the primary side of the current sampling element is connected to each of the input power modules, the second end of the primary side of the current sampling element is connected to the power conversion module, the secondary side of the current sampling element is connected to the input end of the first rectifier element, the output end of the first rectifier element is connected to the input end of the signal generating unit, and the output end of the signal generating unit is connected to the main control module. The signal generating unit includes a first follower element, a comparison element, a second follower element and a signal generating element composed of four NOR gate elements. The first rectifier element is respectively connected in parallel with the first capacitor and the first resistor, and then connected in series with the second resistor and then connected to the positive input terminal of the first follower element. The output terminal of the first follower element is respectively connected to the negative input terminal of the first follower element and the third resistor. The third resistor is also connected to the third capacitor and the fourth resistor. The fourth resistor is also connected to the positive input terminal of the comparison element. The negative input terminal of the comparison element is respectively connected to the fifth resistor and the sixth resistor. The output terminal of the comparison element is connected to the positive input terminal of the second follower element through the eighth resistor. The output terminal of the second follower element is respectively connected to the negative input terminal of the second follower element and the signal generating element. The signal generating element is connected to the main control module. The signal generating element is used to generate four driving signals through each of the NOR gate elements according to the signal output by the second follower element; The current passes through the current sampling element to generate a sampling current signal. The sampling current signal is input into the positive end of the first follower element and then input into the positive end of the comparison element after filtering. The negative end of the comparison element inputs a reference voltage after 15V voltage division. The voltage of the positive end and the voltage of the negative end of the comparison element are compared and the output result is then input into the positive end of the second follower element; the second follower element outputs a signal, and the signal produces four drive signals through the four NOR gate elements.

2. The pulse multi-level voltage output device according to claim 1, characterized in that: Each of the input power modules includes a DC power supply and a freewheeling element connected in parallel with the DC power supply.

3. The pulse multi-level voltage output device according to claim 1, characterized in that: The main control module includes multiple driver chips, each of which is connected to the output end of the signal generating element, and each of which is used to output a driving output signal to the first end and the second end of the switch tube in the power conversion module.

4. The pulse multi-level voltage output device according to claim 1, characterized in that: The power conversion module includes a first switching tube, a second switching tube, a third switching tube, and a fourth switching tube. The third end of the second switching tube is connected to the first end of the primary side of the current sampling element, the third end of the fourth switching tube is connected to the second end of the primary side of the current sampling element, the second end of the second switching tube is respectively connected to the main control module, the voltage output module, and the third end of the first switching tube, the second end of the fourth switching tube is respectively connected to the main control module, the voltage output module, and the third end of the third switching tube, the second end of the first switching tube is respectively connected to the main control module and each of the input power modules, the second end of the third switching tube is respectively connected to the main control module and each of the input power modules, and the first end of the first switching tube, the first end of the second switching tube, the first end of the third switching tube, and the first end of the fourth switching tube are all connected to the main control module.

5. The pulse multi-level voltage output device according to claim 4, characterized in that: The voltage output module includes a first current mutual induction element, a second current mutual induction element, a second capacitor, an inductor, a transformer and a second rectifier element. The first end of the first current mutual induction element is connected to the second end of the fourth switching tube and the third end of the third switching tube respectively. The second end of the first current mutual induction element is connected to the first end of the primary winding in the transformer through the second capacitor and the inductor. The second end of the primary winding in the transformer is connected to the second end of the second switching tube and the third end of the first switching tube respectively. The secondary winding of the transformer is connected to the input end of the second rectifier element. The first output end of the second rectifier element is connected to the first end of the load through the second current mutual induction element. The second output end of the second rectifier element is connected to the second end of the load.

6. A control method for a pulse multi-level voltage output device, applied to the pulse multi-level voltage output device according to any one of claims 1 to 5, characterized in that: The control method includes: Acquiring the current input to the power conversion module through the current sampling module of the pulse multi-level voltage output device; Processing the current using a signal generating unit to obtain a plurality of driving signals; According to all the driving signals, multiple driving chips of the main control module are used to generate driving output signals for controlling the first and second ends of each switch tube in the power conversion module; The operation of each switch tube in the power conversion module is controlled according to all the driving output signals, so that the power conversion module outputs a plurality of pulse level voltages of different voltages.

7. The control method of the pulse multi-level voltage output device according to claim 6, characterized in that: Controlling the operation of each switch tube in the power conversion module according to all the drive output signals so that the power conversion module outputs a plurality of pulse level voltages of different voltages includes: If the first switch tube and the fourth switch tube in the power conversion module are controlled to be turned on according to all the driving output signals, the pulse level voltage output by the power conversion module to the voltage output module is the first voltage; If the second switch tube and the third switch tube in the power conversion module are controlled to be turned on according to all the driving output signals, the pulse level voltage output by the power conversion module to the voltage output module is the second voltage; If all the switch tubes in the power conversion module are controlled to be turned on according to all the driving output signals, the power conversion module outputs a pulse multi-level voltage composed of the superposition of the first voltage and the second voltage to the voltage output module.

8. A switching power supply, characterized in that: A pulse multi-level voltage output device comprising the pulse multi-level voltage output device as described in any one of claims 1-5.

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