CN102647106A

CN102647106A - Pulse generator

Info

Publication number: CN102647106A
Application number: CN2012101606607A
Authority: CN
Inventors: 赵涛
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-05-23
Filing date: 2012-05-23
Publication date: 2012-08-22

Abstract

The invention discloses a pulse generator. The pulse generator comprises at least two basic units, wherein each basic unit comprises at least one inductor, at least one diode, at least one capacitor and at least one controllable switch; one end of the controllable switch unit is connected with the cathode of an input power source and the cathode of the diode; one end of the inductor is connected with the other end of the controllable switch unit and one electrode of the capacitor; the other end of the inductor is connected with the anode of the input power source; the other electrode of the capacitor is connected with the anode of the diode; and in the basic units, the respective electrodes of the capacitor are respectively connected with one end of a load and also can be respectively connected with one end of a transformer. The elements adopted by the invention are all normal components with simple structure and convenience in promotion and application.

Description

A kind of pulse generator

Technical field

The present invention relates to the transformation of electrical energy device in the electric and electronic technical field, be specially a kind of pulse generator.

Background technology

Pulse generator is the converters of using always, is widely used in fields such as prevention and cure of pollution, food processing, Laser Power Devices, nuclear physics.

High-power bipolar pulse source is widely used aspect a lot of in exhaust-gas treatment, food sterilization, material modification, PDP, radar power supply, laser technology and industrial processes etc.The complex structure in the high-power bipolar pulse source of using at present, porch is precipitous inadequately, and efficient is lower.Based on the pulse generator of solid state device because efficient is high, control flexibly, advantage such as volume is less, more and more receive people's attention, based on the high-power bipolar pulse source of solid state device; It has utilized the little characteristic of solid state device distributed capacitance and the high speed characteristics of fast recovery diode, and analysis and emulation show that this clock has following characteristics: step-up ratio is high, and voltage stress is little; Structure is simpler, and efficient is high, and the output porch is precipitous; Frequency is higher, positive and negative symmetry.Having proposed two multilevel hierarchies in the document " New solid-state Marx topology for bipolar repetitive high-voltage pulses " combines to realize the output pulse of plus or minus; The edge time is very fast; But complex structure; And solid state device wherein is a hard switching, and efficient is low.Document " Pulsed Power systems for Food and Wastewater processing " improves this; Thereby in a topology, can realize bipolarity output; But structure is still complicated; In addition, be difficult to realize the synchronous of a plurality of switches that the ball-gap discharge pulse generator exists shake and life problems.Provide the bipolar pulse generator of several kinds of band SG in the document " Narrow pulsed voltage generator for liquid food sterilization "; Prime at these several kinds of clocks is used anti exciting converter; Both limit power, increased complexity again.The pulse generator life-span based on solid state device is long, working stability.Through producing the bipolar pulse source to input square wave differential or through short-circuited transmission line, import circuit and square-wave but must increase like this, make circuit complicated.At document " A low-cost; High-performance pulse generator for ultrasound imaging ", in " Pulse generators for pulsed electric field exposure of biological cells and tissues "; In order to produce high pressure output pulse; Also will introduce high-voltage dc voltage, this has also increased the complexity of circuit.Provided a kind of well behaved high-power bipolar pulse source in the document " Design of Bipolar Pulse Generator for Biomedical Applications ", but power device works in the hard switching state.Need precipitous pulse edge under many circumstances.For example in flue gas desulphurization nitre, precipitous pulse edge can suppress secondary, and then reduces energy consumption; In test cell line, precipitous pulse edge can reduce cell mortality.It is much little to utilize clock that food sterilization is handled the energy that consumes than high temperature sterilization, better effects if.Document " All-Solid-State Repetitive Pulsed-Power Generator Using IGBT and Magnetic Compression Switches " is though introduce the magnetic field impulse compress technique; But the output porch still has 300ns; Precipitous inadequately, and the top is uneven.

Summary of the invention

The purpose of this invention is to provide a kind of pulse generator, to solve pulse generator complex structure in the prior art, efficient is lower, and the output porch is precipitous inadequately, the uneven problem in top.For reaching said purpose, the technical scheme that the present invention adopts is:

A kind of pulse generator; At least comprise two elementary cells; Each elementary cell comprises at least one inductance, at least one diode, at least one capacitor and at least one gate-controlled switch, and an end of said controllable switch unit links the negative pole of input power supply, and connects the negative pole of diode; One end of said inductance is connected on the other end of controllable switch unit, and connects a utmost point of electric capacity; The other end of said inductance links the positive pole of input power supply; Another utmost point of said electric capacity connects the positive pole of diode; A utmost point separately of the electric capacity in the elementary cell connects an end of load respectively, also can connect an end of transformer respectively.

Beneficial effect:

The present invention compares with conventional art has following advantage:

1, the present invention can be transformed to voltage pulse output to input direct voltage, and through control, this voltage pulse output amplitude can be higher than this input direct voltage, also can force down than this input dc power.The forward position of voltage pulse output is precipitous with the edge, back, and flat pulse top is arranged.Through suitable control, can make switching device M realize zero voltage switching, raise the efficiency.When using coupling inductance, the gate-controlled switch device can be realized soft switch, raises the efficiency greatly and useful life.The driving power of gate-controlled switch have a reference point (), this reference point also is the ground of input power supply Vin.So, can only use a driving power, economize on resources, reduce volume and cost greatly.

2, the output of the pulse generator among the present invention pulse repetition frequency is higher, can reach tens KHzs.

3, the element that adopts among the present invention is device commonly used, and is simple in structure, easy to utilize.

Description of drawings

Fig. 1 is the electrical block diagram of the elementary cell used among the present invention, and S represents gate-controlled switch, and L represents the part of inductance or coupling inductance, and D represents diode, and C represents electric capacity.

Fig. 2 is a kind of electrical block diagram of the present invention, and capacitor C 1, diode D1, inductance L 1 and controllable switch S 1 constitute first elementary cell, and capacitor C 2, diode D2, inductance L 2 and controllable switch S 2 constitute second elementary cell.The input power supply is Vin.Here L1 and L2 can make independent inductance, also can be coupling inductances.Can constitute two pairs of output ports respectively by A1 and A2, B1 and B2.

Fig. 3 is the main waveform sketch map of the present invention, and wherein wavy curve 1 is the potential pulse that drives controllable switch S 1, and wavy curve 2 is the potential pulses that drive controllable switch S 2;

Wavy curve

3 and 4 is respectively the voltage of gate-controlled

switch

1 and 2; Wavy curve 5 is the voltage of output port.

A kind of enforcement circuit diagram of Fig. 4 the present invention.

A kind of enforcement circuit diagram of Fig. 5 the present invention.

Embodiment

Be easy to understand and understand in order to make technological means of the present invention, creation characteristic, workflow, method for using reach purpose and effect,, further set forth the present invention below in conjunction with specific embodiment.

1, inductance can be non-coupling inductance, also can be coupling inductance.

2, said controllable switch unit is made up of a gate-controlled switch device, perhaps is electrically connected to form by a plurality of gate-controlled switch devices; When gate-controlled switch device when being a plurality of, the parallel with one another or series connection of a plurality of gate-controlled switch devices.

3, the gate-controlled switch device can be selected metal-oxide-semiconductor for use in the said controllable switch unit, or the IGBT pipe, or the GTO pipe, or the GTR pipe, or the IGCT pipe, or other gate-controlled switch devices.

4, load can be a resistive load, or inductive load, or capacitive load, or transformer, also can be other equipment or device, also can be the combination of above-mentioned load.

As shown in Figure 3,1 is the M1 drive waveforms, and 2 is the M2 drive waveforms, and 3 is the pressure drop of M1 drain-source, and 4 is the pressure drop of M2 drain-source, and 5 is output voltage.

As shown in Figure 4, after gate-controlled switch device M1 or M2 were driven conducting, inductance (or coupling inductance) L1 or L2 can magnetize.After M1 or M2 broke off, owing to can not changing suddenly of inductive current, capacitor C 1 or C2 can be recharged, and the voltage of C1 and C2 raises like this.When M2 breaks off and during the M1 conducting, sustained diode 4 conductings, the current potential of the end that load R is connected with D4 (H1 among Fig. 4) is higher than the current potential of the end (H2 among Fig. 4) that load R is connected with D2, on load R, obtains a pulse voltage.Otherwise, when M1 breaks off and during the M2 conducting, the current potential of H2 is higher than the current potential of H1, on load R, obtains a reverse pulse.Since the effect of inductance (or mutual inductance or leakage inductance) electric current, this diode D1 or the rapid conducting of D2 meeting; When inductance (or mutual inductance or leakage inductance) electric current was reduced to zero, D3 or D4 bore the reverse voltage of capacitor C 1 or C2, can end rapidly.Like this, the rising edge of the pulse voltage on load R and trailing edge time are very short.Because the capacitance of capacitor C 1 or C2 is very big, the flat-top fluctuation of the pulse voltage on the load R is also very little.

As shown in Figure 5, withstand voltage for improving switch, can isolating transformer T1 and T2 have been used in two or more IGBT series connection use simultaneously in principle, and the secondary series connection, can promote output like this and press, realize isolation output.Add two elementary cells like this again, and use transformer, can also further promote output voltage.Similarly, also can a plurality of IGBT parallel connections to improve output current.

More than show and described basic principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand; The present invention is not restricted to the described embodiments; That describes in the foregoing description and the specification just explains principle of the present invention; Under the prerequisite that does not break away from spirit and scope of the invention, the present invention also has various changes and modifications, and these variations and improvement all fall in the scope of the invention that requires protection.The present invention requires protection range to be defined by appending claims and equivalent thereof.

Claims

1. pulse generator; It is characterized in that; At least comprise two elementary cells; Each elementary cell comprises at least one inductance, at least one diode, at least one capacitor and at least one gate-controlled switch, and an end of said controllable switch unit links the negative pole of input power supply, and connects the negative pole of diode; One end of said inductance is connected on the other end of controllable switch unit, and connects a utmost point of electric capacity; The other end of said inductance links the positive pole of input power supply; Another utmost point of said electric capacity connects the positive pole of diode; A utmost point separately of the electric capacity in the elementary cell connects an end of load respectively, also can connect an end of transformer respectively.