CN201550090U

CN201550090U - Pulse modulator

Info

Publication number: CN201550090U
Application number: CN 200920180350
Authority: CN
Inventors: 王玮; 熊才伟; 朱永亮
Original assignee: WUHU GLORYMV ELECTRONICS CO Ltd
Current assignee: WUHU GLORYMV ELECTRONICS CO Ltd
Priority date: 2009-11-09
Filing date: 2009-11-09
Publication date: 2010-08-11
Anticipated expiration: 2019-11-09

Abstract

The utility model discloses a pulse modulator. The pulse modulator comprises a charge power supply, a trigger unit and a load, wherein an output terminal of the charge power supply is connected with an energy-storage capacitor; the energy-storage capacitor and the trigger unit are respectively connected with a switch unit; the switch unit is connected with a pulse transformer; and an output terminal of the pulse transformer is connected with the load. As the structure is adopted, the pulse modulator has the following advantages: firstly, the output pulse width is continuously adjustable; secondly, the pulse modulator is instantly available; thirdly, the circuit is simple, and the structure is compact; and fourthly, long-time reliable operation is ensured.

Description

A kind of pulse modulator

Technical field

The utility model relates to pulse power modulation technique field, particularly a kind of pulse modulator.

Background technology

Traditional pulse modulator produces impulse waveform by boostrap in conjunction with vacuum-tube switch usually, after by charge power supply boostrap being charged to operating voltage, trigger the energy storage release of vacuum-tube switch with boostrap, because vacuum tube is to turn-off uncontrollable element, the width of modulator output pulse is determined by the boostrap parameter, in case after the boostrap parameter was determined, the modulator output pulse width was just fixing, the therefore traditional modulator continuously adjustable system of output pulse width that can't satisfy the demand; Traditional modulator adopts vacuum tube (thyratron) as discharge switch usually, vacuum tube is a kind of hot cathode equipment that adopts ionized gas as conducting medium, before using, system needs preheating filament, can not plug and play, thyratron also needs subsystems such as hydrogen pressure power supply, filament supply and high-voltage trigger to be used, cause that modulator is bulky, because the life-span of thyratron filament is limited, causes modulator to need to change thyratron after operation a period of time and could continue to use simultaneously; Because conventional modulated device boostrap operating voltage is higher usually, the voltage at boostrap electric capacity two ends frequently switches between high pressure and zero potential in the course of the work, has weakened the operational reliability of system.

The utility model content

Technical problem to be solved in the utility model is, at the deficiencies in the prior art, provide a kind of output pulse width adjustable continuously, can plug and play and the pulse modulator of long-time reliability service.

For solving the problems of the technologies described above, the technical solution of the utility model is: a kind of pulse modulator, comprise charge power supply, trigger element and load, the output of described charge power supply is connected with storage capacitor, storage capacitor is connected with switch element respectively with trigger element, described switch element is connected with pulse transformer, and the output of pulse transformer is connected with load.

Described switch element adopts IGBT type solid-state switch.

Described pulse transformer is the elementary winding transformer of fractional turns.

Described each storage capacitor connects to form independently energized circuit by the elementary winding of solid-state switch and pulse transformer independently respectively, and the secondary winding of described pulse transformer and load are composed in series the output loop of pulse transformer.

Be in series with compensating circuit in the described energized circuit, described compensating circuit is composed in parallel by inductance and resistance.

Described charge power supply adopts the high-frequency inversion resonant power.

The utility model adopts said structure, and have the following advantages: 1, output pulse width is adjustable continuously; 2, can plug and play; 3, circuit is simple, compact conformation; 4, long-time reliability service.

Description of drawings

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail;

Fig. 1 is a theory diagram of the present utility model;

Fig. 2 is the circuit structure diagram of the output loop of energized circuit and pulse transformer in the utility model;

Fig. 3 adopts the circuit structure diagram of inductance resnstance transformer network for the utility model.

In Fig. 1～Fig. 3,1, charge power supply; 2, trigger element; 3, load; 4, storage capacitor; 5, switch element; 6, pulse transformer; 7, compensating circuit.

Embodiment

As Fig. 1～a kind of pulse modulator shown in Figure 3, comprise charge power supply 1, trigger element 2 and load 3, the output of charge power supply 1 is connected with storage capacitor 4, charge power supply 1 adopts the high-frequency inversion resonant power, the VD of high stability and low ripple will be obtained behind the rectification of civil power process low frequency, high-frequency inversion and the high-frequency rectification, adopt diode-isolated between charge power supply 1 and the storage capacitor 4, be in series with fuse and current-limiting resistance in the circuit.Storage capacitor 4 is connected with switch element 5 respectively with trigger element 2, and switch element 5 is connected with pulse transformer 6, and the output of pulse transformer 6 is connected with load 3.After charge power supply 1 charges to operating voltage with storage capacitor 4, after boosting by pulse transformer 6, the energy that the triggering signal that switch element 5 reception trigger elements 2 send is stored storage capacitor 4 is applied to the two ends of load 3 as the output pulse.Switch element 5 adopts IGBT type solid-state switch.The high-pressure side of storage capacitor 4 is connected with solid-state switch.Pulse transformer 6 is the elementary winding transformer of fractional turns, because the elementary winding transformer of fractional turns is lower than the umber of turn of the elementary winding transformer of single turn, so its leakage inductance is lower, thereby can obtain to export faster rising edge of a pulse and trailing edge.Each storage capacitor 4 connects to form independently energized circuit by the elementary winding of solid-state switch and pulse transformer 6 independently respectively, and the secondary winding of pulse transformer 6 and load 3 are composed in series the output loop of pulse transformer 6.Because the restriction of the rated voltage of solid-state switch, the operating voltage of energized circuit is lower, and about 1KV, the no-load voltage ratio of pulse transformer 6 is higher.

In Fig. 3, be in series with compensating circuit 7 in the energized circuit, compensating circuit 7 is composed in parallel by inductance and resistance.Z is the equiva lent impedance of load 3, and in discharge process, load 3 voltage waveforms certain top can occur and fall, and influence output pulse is at the flat-top degree.Compensating circuit 7 can be offset output pulse top and be fallen, and at the pulse flat-top initial stage, because inductance presents higher impedance, compensating circuit 7 presents higher impedance, has suppressed the voltage at load 3 two ends; As time passes, the impedance of compensating circuit 7 diminishes gradually, and the influence of load 3 voltages is slowly weakened, and offsets the purpose that the top falls thereby the amplitude by the suppressor pulse initial stage reaches.

In conjunction with the accompanying drawings the utility model has been carried out exemplary description above; obviously the utility model specific implementation is not subjected to the restriction of aforesaid way; as long as the various improvement of having adopted method design of the present utility model and technical scheme to carry out; or directly apply to other occasion without improvement, all within protection range of the present utility model.

Claims

1. pulse modulator, comprise charge power supply (1), trigger element (2) and load (3), it is characterized in that: the output of described charge power supply (1) is connected with storage capacitor (4), storage capacitor (4) is connected with switch element (5) respectively with trigger element (2), described switch element (5) is connected with pulse transformer (6), and the output of pulse transformer (6) is connected with load (3).

2. a kind of pulse modulator according to claim 1 is characterized in that: described switch element (5) adopts IGBT type solid-state switch.

3. a kind of pulse modulator according to claim 1 is characterized in that: described pulse transformer (6) is the elementary winding transformer of fractional turns.

4. according to claim 1 or 2 or 3 described a kind of pulse modulators, it is characterized in that: described each storage capacitor (4) connects to form independently energized circuit by the elementary winding of solid-state switch and pulse transformer (6) independently respectively, and the secondary winding of described pulse transformer (6) and load (3) are composed in series the output loop of pulse transformer (6).

5. a kind of pulse modulator according to claim 4 is characterized in that: be in series with compensating circuit (7) in the described energized circuit, described compensating circuit (7) is composed in parallel by inductance and resistance.

6. a kind of pulse modulator according to claim 1 is characterized in that: described charge power supply (1) adopts the high-frequency inversion resonant power.