CN201918970U

CN201918970U - Impulse modulator based on separation transmission technology of front and back edges of impulse

Info

Publication number: CN201918970U
Application number: CN2010206557726U
Authority: CN
Inventors: 徐晓荣; 陈永浩; 李可; 钟国俭; 谢政
Original assignee: CETC 38 Research Institute
Current assignee: CETC 38 Research Institute
Priority date: 2010-12-13
Filing date: 2010-12-13
Publication date: 2011-08-03
Anticipated expiration: 2020-12-13

Abstract

The utility model belongs to a pulse modulator based on the separation transmission technology of the front and back edges of an impulse. The pulse modulator comprises an impulse generator, a first separation drive circuit, a second separation drive circuit, a third separation circuit, a first separation pulse transformer, a second pulse transformer, a first impulse restoration circuit, a second impulse restoration circuit, an MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) switch opening tube and an MOSFET switch truncation tube. The impulse generator adopts a programmable logic device, separates the front edge and the back edge of inputted primary impulses to form three-way pulse signals, namely, a start impulse, a turn-off impulse and a truncation pulse, the three-way impulse signals pass the drive circuit, the separation pulse transformers and the restoration circuits, and control the MOSFET switch opening tube and the MOSFET switch truncation tube to obtain the modulation impulse output. On the condition that the pulse transformers are used to transmit signals, the impulse modulator can realize real-time response and output the same pulse signals at the secondary under the conditions of arbitrarily controllable primary impulse signal width and arbitrary frequency input, and improves the adapting range and field.

Description

A kind of based on the pulse modulator of pulse front and back along the separated transmission technology

Technical field

The utility model belongs to the radar transmitter technical field, is specifically related to a kind of based on the pulse modulator of pulse front and back along the separated transmission technology.

Background technology

Pulse modulator, the subject matter that needs to solve is elementary control wave can be delivered to the secondary high pressure end in real time, and realizes pulse modulated a kind of device.The device that can isolate transmission of control signals mainly contains: optocoupler or optical fiber, pulse transformer, radio frequency (RF) transformer etc.According to the difference of selected isolation, coupled apparatus, people habitually are called corresponding modulator respectively usually: the box-like modulator of optocoupler, pulse transformer manifold type modulator, the transformer coupled formula modulator of RF.Yet these traditional forwarding methods all have the defective of self.

Though optocoupler or optical fiber can be sent to elementary random waveform secondary, but it is higher relatively that shortcoming is a cost, and the accessory power supply of an isolation of needs when high-pressure side is converted into the signal of telecommunication by light signal, make voltage when low the secondary switch plumber, switching tube can realize that this shortcoming also can be stood with single tube, if voltage is higher, when needing with a plurality of pipe tandem working, need many groups accessory power supplys of isolation mutually, this will seriously limit promoting the use of of this mode.

The output pulse amplitude of pulse transformer and polarity can design as required, and is more convenient flexible; And the negligible amounts of its components and parts helps improving reliability.Its shortcoming is: the operating current of switching tube is big, and loss is bigger, and the pulsewidth of being transmitted is restricted, its width be about transmit 200～300 times of control impuls forward position.

Thus, in a lot of the application, secondary employing voltage-controlled type switch, the transmission of control signal adopts the pulse modulator and the pulse modulation method of the spike on edge before and after the pulse of elementary pulse shaping to bring into use.The secondary voltage-type control switch of pulse modulator adopts the circuit of field controller, drive signal does not need big electric current, only need the on/off of a control of transmission voltage with regard to may command tube used for bottom pouring and truncation pipe, but but exist interelectrode capacitance between the grid source electrode of this class field controller, the forward position of drive signal must at first be charged to the required electric field of tube used for bottom pouring conducting to this electric capacity, can keep the conducting of switch.After the pulse front edge, interelectrode capacitance has been full of electricity, need not control impuls energy is provided again, so the pulsewidth of control impuls is meaningless, only needs a pulse front edge to get final product; When end-of-pulsing, if allow the anti-phase electric charge of filling with of interelectrode capacitance, produce anti-phase electric field equally, then tube used for bottom pouring will end immediately.Like this, pulse transformer only need transmit a forward position pulse and a trailing edge, just can make control secondary switch pipe with certain pulsewidth work, pulsewidth is determined to the time of delay between the forward position of trailing edge by the forward position of forward position pulse, rather than the pulse duration of control signal (forward position pulse and trailing edge) decision, the electric charge that the maximum pulse width of modulator is subject to interelectrode capacitance leaks ability, rather than the maximum transmitted pulsewidth ability of pulse transformer.Not only keep this moment pulse transformer to isolate the advantage of transmission of control signals, and overcome the limited deficiency of maximum pulse width of pulse transformer.

The utility model content

The purpose of this utility model provides a kind of based on the pulse modulator of pulse front and back along the separated transmission technology, to overcome the defective of existing pulse modulator.

The technical solution that the utility model is taked is as follows:

A kind ofly comprise: pulse generator based on the pulse modulator along the separated transmission technology before and after the pulse, first isolated drive circuit, second isolated drive circuit, the 3rd isolated drive circuit, the first Isolated Pulse Transformer T1, the second Isolated Pulse Transformer T2, the first pulse-recovery circuit, the second pulse-recovery circuit, switch mosfet tube used for bottom pouring, switch mosfet truncation pipe;

Pulse generator comprises: inverter, delayer, the first rising edge trigger, the second rising edge trigger, the 3rd rising edge trigger, first pulse counter, second pulse counter, the 3rd pulse counter;

Input pulse A is connected to the input of the first rising edge trigger, and its output signal is connected to first pulse counter, output unbalanced pulse D after first pulse counter is handled;

Input pulse A is output rp pulse B after inverter is handled; Rp pulse B is connected to the second rising edge trigger input, and its output signal is connected to second pulse counter, and pulse E is turn-offed in output after second pulse counter is handled;

The delayed device of rp pulse B postpones back output delay rp pulse C, postpones rp pulse C and is connected to the 3rd rising edge trigger input, and its output signal is connected to the 3rd pulse counter, output truncation pulse F after the 3rd pulse counter is handled;

Unbalanced pulse D, shutoff pulse E, truncation pulse F are connected with the signal input part of first isolated drive circuit, second isolated drive circuit, the 3rd isolated drive circuit respectively; The elementary two ends of the first Isolated Pulse Transformer T1 respectively with the first isolated drive circuit signal output part, the second isolated drive circuit signal output part connects; The elementary end ground connection of the second Isolated Pulse Transformer T2, the other end is connected with the 3rd isolated drive circuit signal output part;

The drain electrode of switch mosfet tube used for bottom pouring is connected with positive bias-voltage, and switch mosfet truncation pipe source electrode is connected with negative bias voltage, and drain electrode is connected switch mosfet tube used for bottom pouring source electrode with switch mosfet truncation pipe, and this tie point is the modulating pulse output;

The grid of switch mosfet tube used for bottom pouring is connected with the first pulse-recovery circuit signal output, and switch mosfet truncation tube grid is connected with the second pulse-recovery circuit signal output;

Pulse signal generator adopts programmable logic device to realize;

First isolated drive circuit is by photoelectrical coupler V1, prime chip for driving U1A, and power drive chip U2, resistance R 1, R2, capacitor C 1, C2, C3, C4 constitute; Unbalanced pulse D imports by R1, and the unbalanced pulse D after the amplification is by capacitor C 4 outputs;

Second isolated drive circuit is by photoelectrical coupler V2, prime chip for driving U1B, and power drive chip U3, resistance R 3, R4, capacitor C 5, C6, C7, C8 constitute; Turn-off pulse E by resistance R 3 inputs, the shutoff pulse E after the amplification is by capacitor C 8 outputs;

The 3rd isolated drive circuit is by photoelectrical coupler V3, prime chip for driving U1C, and power drive chip U4, resistance R 5, R6, capacitor C 9, C10, C11, C12 constitute; Truncation pulse F imports by R5, and the truncation pulse F after the amplification exports by C12;

The first pulse-recovery circuit is by diode 6V1,6V2,6V3, Transient Suppression Diode 6V6, and NPN triode 6V4, field effect transistor 6V5, resistance 6R1,6R2,6R3,6R4,6R5 constitute; Its input is connected with T1 level of first Isolated Pulse Transformer two ends respectively; Its signal output part is connected with switch mosfet tube used for bottom pouring 6V7 grid;

The second pulse-recovery circuit is by diode 6V8,6V9, Transient Suppression Diode 6V11, and PNP triode 6V10, resistance 6R6,6R7,6R8 constitute; Two signal input part is connected with T2 level of second Isolated Pulse Transformer two ends respectively; Its signal output part is connected with switch mosfet truncation pipe 6V12 grid.

The good effect that the utility model had is:

1, using under the pulse transformer transmission signals prerequisite, realized under elementary any control wave width (hundreds of nanosecond is to continuous wave) and optional frequency input condition, but in secondary real-time response and export the identical pulse signal, improved the accommodation of pulse modulator.

2, secondary use passive circuit, switch adopt the MOSFET pipe to realize that not only circuit is simple, realize that cost is low, the reliability height, and before and after the modulating pulse output waveform along little, waveform is undistorted.

3, under the situation of elementary no input pulse, by regularly replenishing the technology of turn-offing pulse, make additional shutoff burst pulse realize that electric capacity can reliably discharge between switch mosfet grid source electrode, guarantee reliably ending of switch mosfet, can effectively prevent under the situation that sparking or other interference occur, pulse modulator can misoperation, and use that can safety is under various environmental conditions.

Description of drawings

Fig. 1 is along forming schematic diagram before and after the elementary control impuls of the utility model.

Fig. 2 is the elementary pulse shaping sequential chart of the utility model.

Fig. 3 isolates output for the utility model pulse signal and drives figure.

Fig. 4 drives isolating transformer figure for the utility model.

Fig. 5 is the secondary oscillogram of the utility model Isolated Pulse Transformer.

Fig. 6 is the secondary waveform restore circuit of the utility model figure.

Fig. 7 is the utility model pulse modulator output waveform figure.

Fig. 8 is the utility model circuit structure block diagram.

Embodiment

As Fig. 1-shown in Figure 8:

Pulse signal generator adopts programmable logic device to realize;

The first pulse-recovery circuit is by diode 6V1,6V2,6V3, voltage stabilizing didoe 6V6, and NPN triode 6V4, field effect transistor 6V5, resistance 6R1,6R2,6R3,6R4,6R5 constitute; Its input is connected with T1 level of first Isolated Pulse Transformer two ends respectively; Its signal output part is connected with switch mosfet tube used for bottom pouring 6V7 grid;

The second pulse-recovery circuit is by diode 6V8,6V9, voltage stabilizing didoe 6V11, and PNP triode 6V10, resistance 6R6,6R7,6R8 constitute; Two signal input part is connected with T2 level of second Isolated Pulse Transformer two ends respectively; Its signal output part is connected with switch mosfet truncation pipe 6V12 grid.

Below in conjunction with accompanying drawing the utility model is further described.

As shown in Figure 1, whole elementary pulse generator adopts programmable logic device realizations such as CPLD/FPGA, comprised inverter modules, delayer module, rising edge igniter module and pulse counter module etc., the major function of the circuit that a plurality of module combinations become is the front and back of realizing input pulse along separating, regularly replenish unlatchings/shutoffs pulse and according to the back edge generation truncation pulse of input pulse.Elementary input control impuls waveform is shown in Fig. 2 A, it is the pulse signal of one-period, when pulse signal arrives, through behind the first rising edge trigger of Fig. 1, automatically pulse front edge is taken out, deliver to first pulse counter of Fig. 1 afterwards after, count, determine the width of output forward position pulse, can recover identical pulse secondary for adapting under the burst pulse situation (for example hundreds of nanosecond), the width of forward position pulse can be decided to be about 200-300ns.Because what secondary switch (Fig. 6 6V7) adopted is switch mosfet, the size of electric capacity is certain between its grid source electrode, under elementary broad pulse input condition when continuous wave (for example), give electric capacity charging between switch mosfet grid source electrode if only depend on a forward position pulse, because there is the slow leakage of electric charge in electric capacity between the grid source electrode, behind certain hour, electric charge on the electric capacity will be fewer and feweri, the electric field of last its last electric charge can't be kept the conducting of switch, thereby forward position pulse of simple dependence transmission can't adapt to the very wide situation of pulsewidth, so in first pulse counter of elementary pulse generator, also automatic setting regularly replenish the unbalanced pulse function, when promptly importing pulsewidth above 200 μ S, automatically replenish a unbalanced pulse, therefore the impulse waveform of finally exporting behind first pulse counter of Fig. 1 is for shown in the D of Fig. 2.

The elementary input control impuls of Fig. 1 through an inverter modules after, become the waveform shown in Fig. 2 B point, by behind the second rising edge trigger and second pulse counter, take out the back edge of output pulse afterwards, its operation principle is identical with above-mentioned unbalanced pulse producing method.Under normal circumstances, only needing to transmit a shutoff pulse just can discharge the electric charge on the electric capacity between the grid source electrode on the secondary switch mosfet, but because modulator operating voltage height, operational environment is more abominable, when abnormal conditions such as some sparkings or interference occurring, 6V7 switch mosfet undesired open-minded among Fig. 6 can appear, if do not turn-off pulse this moment, will cause MOSFET to continue conducting and damage, serious may damage whole system, therefore in order to ensure system's reliably working, in second pulse counter of Fig. 1 also automatic setting regularly replenish to turn-off pulse function, replenish one every 200 μ S and turn-off pulse, its impulse waveform of finally exporting behind second pulse counter of Fig. 1 is for shown in the E of Fig. 2.

For guaranteeing that secondary unlatching MOSEFT pipe (Fig. 6 6V7) can end fast, guarantee after the modulator pulses along little, also need a truncation pulse, truncation MOSFET pipe (Fig. 6 6V12) is open-minded fast, pulse (Fig. 2 B) among Fig. 1 behind the process inverter, after through a Postponement module (Fig. 2 C), send into the 3rd rising edge trigger and the 3rd pulse counter after, produce the truncation pulse.The effect of Postponement module is with the signal delay certain hour, and guaranteeing to turn-off between pulse (Fig. 2 D) and the truncation pulse (Fig. 2 E) has a Dead Time, avoids secondary (6V7 and 6V12 among Fig. 6) two switches to occur periodically being communicated with and damaging.The final waveform of truncation pulse among Fig. 1 is shown in Fig. 2 F.

As shown in Figure 3, three road pulse signals that produce among Fig. 1 (unlatching, shutoff and truncation pulse), deliver to three road optocoupler V1, V2 among Fig. 3 and the input of V3 by R1, R3 and R5 respectively, after light-coupled isolation, the arrival optocoupler is secondary, for guaranteeing certain driving force, arriving three road secondary signals of optocoupler drives through CMOS drive circuit U1, give chip for driving U2, U3 and U4 afterwards, and drive the isolating transformer of back level through capacitor C 4, C8 and C12 after straight respectively with big output peak current.

Chip for driving U2 among Fig. 3, U3 and U4 adopt the chip of the complementary symmetrical version of N raceway groove and P channel mosfet switch composition, and its structure as shown in Figure 4.When unbalanced pulse arrived, 4V1 among Fig. 4 and 4V4 conducting were in the pulse of the forward of secondary generation of transformer T1; When turn-offing the pulse arrival, 4V3 among Fig. 4 and 4V2 conducting produce an anti-phase pulse in T1 level of transformer, and therefore, the waveform of T1 level of final transformer is shown in the G-H of Fig. 5.Truncation pulse among Fig. 1 produces the pulse of a forward at Fig. 4 transformer T2 two ends behind overdrive circuit, its waveform is shown in the M-N of Fig. 5.

As shown in Figure 6, Fig. 4 driving transformer T1 and T2 time level two ends are connected to G, the H of Fig. 6 and M, N end points respectively.After unbalanced pulse arrives, be the relative H point of G point when high, the 6V5 conducting, electric current is from the G point 6V1 that flows through, 6R5,6C0,6V5, get back to the H point, tube used for bottom pouring 6V7 conducting this moment, electric capacity 6C0 is recharged between 6V7 grid source electrode, after unbalanced pulse finishes, owing on the electric capacity 6C0 voltage is arranged always between 6V7 grid source electrode, therefore the grid source electrode of 6V7 keeps conducting state, the D of 6V7, S is open-minded, and this moment, positive bias-voltage was exported by 6V7, when elementary control impuls width broadens, unbalanced pulse by replenishing still can guarantee the required electric field of electric capacity 6C0 conducting between tube used for bottom pouring 6V7 grid source electrode, continues to keep the 6V7 conducting; After turn-offing the pulse arrival, when promptly the relative G point of H point is high, the 6V4 conducting, electric current is got back to the G point from H point flow through 6V0,6C0,6R5,6V4, and electric capacity 6C0 is discharged between 6V7 grid source electrode, this moment, tube used for bottom pouring 6V7 was because of instead ending partially between the grid source electrode, and positive bias-voltage can't be exported by 6V7.After the truncation pulse arrives, be the relative N point of M point when high, electric current is from M point flow through 6V8,6V9,6R7,6C1, get back to the N point, truncation this moment pipe 6V12 conducting, negative bias voltage is given 6V7 partially anti-and output rapidly by 6V12, has guaranteed that the pulse back edge of modulator does not trail, along little, waveform is undistorted after the modulating pulse.After the pulse between M, N disappeared, the electric charge at electric capacity 6C1 two ends can pass through 6R7,6V10 discharge between truncation pipe 6V12 grid source electrode, and 6V12 can be ended fast, the logical 6R8 output of negative bias voltage, and final pulse modulator output waveform is as shown in Figure 7.

An outstanding advantage of this modulator is can effectively prevent to disturb, and prevents that the false triggering situation from occurring.For preventing when occurring disturbing, conducting false triggering appears and in 6V7 among Fig. 6, this modulator has been taked the elimination perturbation technique, promptly during elementary uncontrolled pulse, regularly replenish to send and turn-off pulse, make that electric capacity 6C0 is in anti-phase charged state between 6V7 grid source electrode always, in pulse modulator work between secondary H, G, even there is disturbing pulse to arrive, can not cause the false triggering of 6V7 yet and open.

Claims

One kind based on before and after the pulse along the pulse modulator of separated transmission technology, it is characterized in that: described a kind ofly comprise: pulse generator based on the pulse modulator along the separated transmission technology before and after the pulse, first isolated drive circuit, second isolated drive circuit, the 3rd isolated drive circuit, the first Isolated Pulse Transformer T1, the second Isolated Pulse Transformer T2, the first pulse-recovery circuit, the second pulse-recovery circuit, the switch mosfet tube used for bottom pouring, switch mosfet truncation pipe;

Pulse generator comprises: inverter, delayer, the first rising edge trigger, the second rising edge trigger, the 3rd rising edge trigger, first pulse counter, second pulse counter, the 3rd pulse counter;

Input pulse A is connected to the input of the first rising edge trigger, and its output signal is connected to first pulse counter, output unbalanced pulse D after first pulse counter is handled;

Input pulse A is output rp pulse B after inverter is handled; Rp pulse B is connected to the second rising edge trigger input, and its output signal is connected to second pulse counter, and pulse E is turn-offed in output after second pulse counter is handled;

The delayed device of rp pulse B postpones back output delay rp pulse C, postpones rp pulse C and is connected to the 3rd rising edge trigger input, and its output signal is connected to the 3rd pulse counter, output truncation pulse F after the 3rd pulse counter is handled;

Unbalanced pulse D, shutoff pulse E, truncation pulse F are connected with the signal input part of first isolated drive circuit, second isolated drive circuit, the 3rd isolated drive circuit respectively; The elementary two ends of the first Isolated Pulse Transformer T1 respectively with the first isolated drive circuit signal output part, the second isolated drive circuit signal output part connects; The elementary end ground connection of the second Isolated Pulse Transformer T2, the other end is connected with the 3rd isolated drive circuit signal output part;

The drain electrode of switch mosfet tube used for bottom pouring is connected with positive bias-voltage, and switch mosfet truncation pipe source electrode is connected with negative bias voltage, and drain electrode is connected switch mosfet tube used for bottom pouring source electrode with switch mosfet truncation pipe, and this tie point is the modulating pulse output;

The grid of switch mosfet tube used for bottom pouring is connected with the first pulse-recovery circuit signal output, and switch mosfet truncation tube grid is connected with the second pulse-recovery circuit signal output.
2. according to claim 1 a kind of based on the pulse modulator of pulse front and back along the separated transmission technology, it is characterized in that: pulse signal generator adopts programmable logic device to realize.
3. according to claim 1 a kind of based on the pulse modulator of pulse front and back along the separated transmission technology, it is characterized in that: first isolated drive circuit is by photoelectrical coupler V1, prime chip for driving U1A, power drive chip U2, resistance R 1, R2, capacitor C 1, C2, C3, C4 constitute; Unbalanced pulse D imports by R1, and the unbalanced pulse D after the amplification is by capacitor C 4 outputs;

Second isolated drive circuit is by photoelectrical coupler V2, prime chip for driving U1B, and power drive chip U3, resistance R 3, R4, capacitor C 5, C6, C7, C8 constitute; Turn-off pulse E by resistance R 3 inputs, the shutoff pulse E after the amplification is by capacitor C 8 outputs;

The 3rd isolated drive circuit is by photoelectrical coupler V3, prime chip for driving U1C, and power drive chip U4, resistance R 5, R6, capacitor C 9, C10, C11, C12 constitute; Truncation pulse F imports by R5, and the truncation pulse F after the amplification exports by C12.
4. according to claim 1 a kind of based on the pulse modulator of pulse front and back along the separated transmission technology, it is characterized in that: the first pulse-recovery circuit is by diode 6V1,6V2,6V3, voltage stabilizing didoe 6V6, NPN triode 6V4, field effect transistor 6V5, resistance 6R1,6R2,6R3,6R4,6R5 constitute; Its input is connected with T1 level of first Isolated Pulse Transformer two ends respectively; Its signal output part is connected with switch mosfet tube used for bottom pouring 6V7 grid;

The second pulse-recovery circuit is by diode 6V8,6V9, voltage stabilizing didoe 6V11, and PNP triode 6V10, resistance 6R6,6R7,6R8 constitute; Two signal input part is connected with T2 level of second Isolated Pulse Transformer two ends respectively; Its signal output part is connected with switch mosfet truncation pipe 6V12 grid.