A topological structure of a bipolar current pulse generating circuit and a generating method thereof

Abstract

The present invention discloses a topological structure of a bipolar current pulse generating circuit, comprising a control device and a generating circuit module, the generating circuit module comprising a positive control signal input terminal, a negative control signal input terminal and the generating circuit module; the generating circuit module receives a positive control signal from the control device through the positive control signal input terminal, generates a positive output voltage, and generates a positive output current on an inductive load; the generating circuit module receives a negative control signal from the control device through the negative control signal input terminal, generates a negative output voltage, and generates a negative output current on an inductive load; a corresponding bipolar current pulse generating method is also disclosed; the present invention can realize wide-range voltage regulation and variable output voltage polarity at the same time, generate bipolar current pulses with adjustable pulse width, amplitude, and adjustable pulse rise and fall times; the height, width, and pulse current rise and fall times of the current pulse are all controllable.

Description

Technical Field

[0001] This patent relates to the field of current pulse generation topology and control method, specifically a topology structure and method of a bipolar current pulse generation circuit. Background Art

[0002] The topology generator for bipolar current pulses for inductive loads is a core component of devices such as high-magnetic field generators and geophysical magnetic field transmitters. In practical applications, it is necessary to control the frequency and amplitude of the topology generator circuit to control the frequency and intensity of the magnetic field.

[0003] Large inductive loads have large time constants. To achieve a higher frequency and magnetic field strength, it is necessary to further increase the voltage across the inductive load and the rate of change of the current during the pulse current rise process, so that the inductive load current reaches a steady state as quickly as possible and generates the required magnetic field. Therefore, the topology of the bipolar current pulse generation circuit requires a wide voltage regulation range. At the same time, because bipolar current needs to be generated, the output voltage must meet the condition of variable polarity.

[0004] Existing bipolar pulse current generation circuits, limited by their topological structure, struggle to simultaneously meet the requirements of wide-range voltage regulation and variable output voltage polarity. Therefore, achieving current pulses with the desired width / height, and rise / fall times, while utilizing a simplified topological structure, is a pressing challenge. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing technology and provide a topology structure generation circuit of a bipolar current pulse generation circuit, which solves the problem that it is difficult to simultaneously meet the requirements of wide-range voltage regulation and variable output voltage polarity under large inductive load conditions.

[0006] In view of the above problems, the technical solution adopted by the present invention is:

[0007] As one aspect of the present invention, a topological structure of a bipolar current pulse generating circuit is provided, including a control device and a generating circuit module, the generating circuit module having a positive control signal input terminal, a negative control signal input terminal and a generating circuit module; the generating circuit module receives a positive control signal from the control device through the positive control signal input terminal, generates a positive output voltage, and generates a positive output current on the inductive load; the generating circuit module receives a negative control signal from the control device through the negative control signal input terminal, generates a negative output voltage, and generates a negative output current on the inductive load.

[0008] Furthermore, the generating circuit module includes a first IGBT tube S1, a second IGBT tube S2, a third IGBT tube S3, a fourth IGBT tube S4, a fifth IGBT tube S5, a first diode D1, a second diode D2, a third diode D3, a filter inductor Lf, and an output filter capacitor Co; the positive electrode of the DC bus of the topological structure is connected to the emitter of the first IGBT tube S1, and the negative electrode of the DC bus is connected to the emitter of the fifth IGBT tube S5, the emitter of the fourth IGBT tube S4, the lower terminal of the output filter capacitor Co, and the lower terminal of the inductive load;

[0009] The collector of the first IGBT tube S1 is connected to the collector of the second IGBT tube S2, the left terminal of the filter inductor Lf and the cathode of the third diode D3; the emitter of the second IGBT tube S2 is connected to the cathode of the first diode D1;

[0010] The collector of the third IGBT tube S3 is connected to the right terminal of the filter inductor Lf and the collector of the fourth IGBT tube S4;

[0011] The emitter of the fifth IGBT tube S5 is connected to the anode of the third diode D3; the anode of the first diode D1 is connected to the anode of the second diode D2, the upper terminal of the output filter capacitor Co and the upper terminal of the inductive load; the output filter capacitor Co is connected in parallel to both ends of the inductive load.

[0012] As another aspect of the present invention, it also relates to a method for generating a topology structure of a bipolar current pulse generating circuit, comprising the following steps:

[0013] Step 1: In the initial state, the third IGBT tube S3 and the fifth IGBT tube S5 are turned on, and the second IGBT tube S2 is turned off. The first IGBT tube S1 and the fourth IGBT tube S4 are turned on and off synchronously within a current positive pulse time. Within this time, a positive output voltage can be generated on the output filter capacitor and a positive output current can be generated on the inductive load.

[0014] Step 2: In the initial state, the second IGBT tube S2 and the fourth IGBT tube S4 are turned on, and the third IGBT tube S3 and the fifth IGBT tube S5 are turned off. Within a current negative pulse time, the first IGBT tube S1 is turned on and off, which can generate a negative output voltage on the output filter capacitor and a negative output current on the inductive load within this time.

[0015] By alternately performing steps 1 and 2, the topological structure of the bipolar current pulse generating circuit can be used to generate bipolar current pulses, and the height, width, and pulse current rise and fall times of the current pulses can be controlled.

[0016] Furthermore, the initial state is a state in which the first IGBT tube S1 and the fourth IGBT tube S4 are turned on, and the other switches are turned off.

[0017] Furthermore, in step 1, by controlling the duty ratios of the first IGBT tube S1 and the fourth IGBT tube S4, the output voltage and current can be controlled.

[0018] Furthermore, in step 2, by controlling the duty cycle of the first IGBT tube S1, the output voltage and current can be controlled.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The topology of the bipolar current pulse generating circuit of the present invention can realize wide range voltage regulation and variable output voltage polarity, thereby generating bipolar current pulses with adjustable pulse width, amplitude, and adjustable pulse rise and fall times.

[0021] 2. The topology of the bipolar current pulse generating circuit of the present invention is such that the height, width, and rise and fall times of the current pulse are all controllable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the overall structure of a preferred embodiment of the present invention;

[0023] Figure 2 A schematic diagram of the topological structure of a preferred embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the working state of the preferred embodiment of the present invention when outputting a forward pulse current;

[0025] Figure 4 This is a schematic diagram of the working state of a preferred embodiment of the present invention when outputting a negative pulse current;

[0026] Figure 5 The working state of the preferred embodiment of the present invention in the initial state

[0027] Figure 6 The voltage waveform across the inductive load of the bipolar current pulse generating circuit of the preferred embodiment of the present invention is shown;

[0028] Figure 7 The current waveform across the inductive load of the bipolar current pulse generating circuit of the preferred embodiment of the present invention is shown; DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] like Figure 1 As shown, the present invention relates to a topological structure of a bipolar current pulse generating circuit, comprising a control device 1 and a generating circuit module 2, wherein the generating circuit module 2 comprises a positive control signal input terminal 21, a negative control signal input terminal 22 and a generating circuit module 23; the generating circuit module 2 receives a positive control signal from the control device 1 through the positive control signal input terminal 21, generates a positive output voltage, and generates a positive output current on the inductive load; the generating circuit module 2 receives a negative control signal from the control device 1 through the negative control signal input terminal 22, generates a negative output voltage, and generates a negative output current on the inductive load.

[0031] like Figure 2 As shown, a bipolar current pulse generating circuit, the topology of which is composed of a first IGBT tube S1, a second IGBT tube S2, a third IGBT tube S3, a fourth IGBT tube S4, a fifth IGBT tube S5, a first diode D1, a second diode D2, a third diode D3, a filter inductor Lf, an output filter capacitor Co and an inductive load;

[0032] The DC busbar's positive electrode in this topology is connected to the emitter of the first IGBT S1, and its negative electrode is connected to the emitter of the fifth IGBT S5, the emitter of the fourth IGBT S4, the lower terminal of the output filter capacitor Co, and the lower terminal of the inductive load. The collector of the first IGBT S1 is connected to the collector of the second IGBT S2, the left terminal of the filter inductor Lf, and the cathode of the third diode D3. The emitter of the second IGBT S2 is connected to the cathode of the first diode D1. The collector of the third IGBT S3 is connected to the right terminal of the filter inductor Lf and the collector of the fourth IGBT S4. The emitter of the fifth IGBT S5 is connected to the anode of the third diode D3. The anode of the first diode D1 is connected to the anode of the second diode D2, the upper terminal of the output filter capacitor Co, and the upper terminal of the inductive load. The output filter capacitor Co is connected in parallel across the inductive load.

[0033] Corresponding to the above topological structure, the present invention proposes a basic control method applicable to the bipolar current pulse generating circuit of the present invention. By using this basic control method, a bipolar pulse current with the required frequency and amplitude can be obtained.

[0034] Step 1, working status is as follows Figure 3 As shown in the figure, in the initial state, the third IGBT S3 and the fifth IGBT S5 are turned on, and the second IGBT S2 is turned off. During a current positive pulse, the first IGBT S1 and the fourth IGBT S4 are synchronously turned on and off. During this time, a positive output voltage is generated on the output filter capacitor and a positive output current is generated on the inductive load. By controlling the duty cycle of the first IGBT S1 and the fourth IGBT S4, the output voltage and current can be controlled.

[0035] Step 2, working status is as follows Figure 4 As shown in the figure, in the initial state, the second IGBT S2 and the fourth IGBT S4 are turned on, while the third IGBT S3 and the fifth IGBT S5 are turned off. During a negative current pulse, the first IGBT S1 is turned on and off, generating a negative output voltage on the output filter capacitor and a negative output current on the inductive load. By controlling the duty cycle of the first IGBT S1, the output voltage and current can be controlled.

[0036] By alternately performing steps 1 and 2, the bipolar current pulses generated by the bipolar current pulse generating circuit can be utilized, and the height, width, and pulse current rise and fall times of the current pulses are all controllable.

[0037] like Figure 6 、 7 As shown, the voltage and current waveforms at both ends of the inductive load of the bipolar current pulse generating circuit proposed by the present invention are as follows. Under the aforementioned basic control method, a bipolar current pulse with a given pulse width, amplitude, and rise and fall time that meets the requirements is generated.

[0038] The present invention proposes a bipolar current pulse generating circuit. The bipolar current pulse generating circuit of the present invention can achieve wide-range voltage regulation, while realizing variable output voltage polarity, and generating bipolar current pulses with adjustable pulse width, amplitude, and adjustable pulse rise and fall times.

[0039] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely illustrative of the structural relationships and principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. A topological structure of a bipolar current pulse generating circuit, characterized in that : including a control device (1) and a generator The generating circuit module (2) comprises a positive control signal input terminal (21), a negative control signal input terminal (22) and a generating circuit module (23); the generating circuit module (2) receives a positive control signal from the control device (1) through the positive control signal input terminal (21), generates a positive output voltage, and generates a positive output current on the inductive load; the generating circuit module (2) receives a negative control signal from the control device (1) through the negative control signal input terminal (22), generates a negative output voltage, and generates a negative output current on the inductive load; the generating circuit module (23) comprises a first IGBT tube S1, a second IGBT tube S2, a third IGBT tube S3, a fourth IGBT tube S4, a fifth IGBT tube S5, and a first diode D1. , a second diode D2, a third diode D3, a filter inductor Lf, and an output filter capacitor Co; the positive electrode of the DC bus of the topological structure is connected to the collector of the first IGBT tube S1, and the negative electrode of the DC bus is connected to the collector of the fifth IGBT tube S5, the emitter of the fourth IGBT tube S4, the lower terminal of the output filter capacitor Co, and the lower terminal of the inductive load; The emitter of the first IGBT tube S1 is connected to the emitter of the second IGBT tube S2, the left terminal of the filter inductor Lf and the cathode of the third diode D3; the collector of the second IGBT tube S2 is connected to the cathode of the first diode D1; The collector of the third IGBT tube S3 is connected to the right terminal of the filter inductor Lf and the collector of the fourth IGBT tube S4; The emitter of the fifth IGBT tube S5 is connected to the anode of the third diode D3; the anode of the first diode D1 is connected to the cathode of the second diode D2, the upper terminal of the output filter capacitor Co and the upper terminal of the inductive load; the output filter capacitor Co is connected in parallel to both ends of the inductive load.

2. The method for generating a bipolar current pulse according to the topological structure of the bipolar current pulse generating circuit according to claim 1, characterized in that: The steps include: Step 1: In the initial state, the third IGBT tube S3 and the fifth IGBT tube S5 are turned on, and the second IGBT tube S2 is turned off. The first IGBT tube S1 and the fourth IGBT tube S4 are synchronously turned on and off within a current positive pulse time. During this time, a positive output voltage is generated on the output filter capacitor and a positive output current is generated on the inductive load; Step 2: In the initial state, the second IGBT tube S2 and the fourth IGBT tube S4 are turned on, and the third IGBT tube S3 and the fifth IGBT tube S5 are turned off. During a current negative pulse time, the first IGBT tube S1 is turned on and off, which can generate a negative output voltage on the output filter capacitor and a negative output current on the inductive load during this time. By alternately performing steps 1 and 2, the topological structure of the bipolar current pulse generating circuit can be used to generate bipolar current pulses; and the height, width, pulse current rise and fall time of the current pulse are all controllable. 3 . The method for generating a bipolar current pulse according to the topological structure of the bipolar current pulse generating circuit according to claim 2 , wherein the initial state is a state in which the first IGBT tube S1 and the fourth IGBT tube S4 are turned on and the other switches are turned off.

4. The method for generating a bipolar current pulse according to the topological structure of the bipolar current pulse generating circuit according to claim 2, wherein in step 1, the output voltage and current are controlled by controlling the duty ratio of the first IGBT tube S1 and the fourth IGBT tube S4.

5. The method for generating bipolar current pulses according to the topological structure of the bipolar current pulse generating circuit according to claim 2, wherein in step 2, the output voltage and current are controlled by controlling the duty cycle of the first IGBT tube S1.

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