CN201252524Y

CN201252524Y - EMC electronic switch

Info

Publication number: CN201252524Y
Application number: CNU2008200984744U
Authority: CN
Inventors: 王宏哲; 刘青松; 许响林; 李彬; 胡芳芳
Original assignee: Chongqing Vehicle Test & Research Institute Co ltd
Current assignee: Chongqing Vehicle Test & Research Institute Co ltd
Priority date: 2008-06-02
Filing date: 2008-06-02
Publication date: 2009-06-03
Anticipated expiration: 2018-06-02

Abstract

The utility model relates to an EMC electronic switch, which comprises a Schmitt trigger for shaping pulse, a photocoupler for connecting and coupling the Schmitt trigger and two triodes, when a switch is closed, a field-effect tube generates millimicrosecond pulse through the excitation of the two triodes, an electric inductance whose one end is connected with a D electrode of the field-effect tube, the other end is connected with a capacitance, wherein the electric inductance conducts and generates an instant reverse high-voltage through the millimicrosecond pulse action emitted by the field-effect tube, the other end of the capacitance is connected with the other electric inductance, and the capacitance is forced by the multiple-voltage of the electric inductance, which enables the capacitance to instantly discharge to a Schottky diode connected with the capacitance, the photocoupler is further connected with a NPN type triode and a PNP type triode, which forms a push-pull amplifier and the field-effect tube, and the positive end of the Schottky diode is connected with the D electrode of the field-effect tube. The electronic switch of the utility mode can overcome the existing defects and realize the trigger rate of a millimicrosecond electrode.

Description

The EMC electronic switch

Technical field

The utility model relates to the electronic switch field, specifically, is meant a kind of electronic switch that can have electromagnetic compatibility simultaneously.

Background technology

So the electronic switch difficult point is at high-power, super bandwidth, the very high speediness of frequency microwave frequency.Shown in figure 1,2, in general, power is big more, the PN joint of components and parts is corresponding big more, and corresponding stray inductance Lj and capacitor C j are also big more, and stray inductance Lj and capacitor C j are inherent, it has defined the cut-off frequency of switch, has limited the speed of electronic switch.In addition, encapsulation electric capacity causes that isolation raises with frequency and reduction gradually.Package parasitic inductance Lp causes that the switch Insertion Loss increases in proportion with frequency.

The utility model content

The purpose of this utility model provides a kind of electronic switch, and it can overcome existing defective, can realize that nanosecond triggers speed.

In order to solve the problem that prior art exists, the technical solution adopted in the utility model is:

A kind of electronic switch, it comprises Schmidt trigger, is used for the paired pulses shaping; Photoelectrical coupler is used and is connected coupling Schmidt trigger and two triode Q1 and Q2; Triode Q1 is a NPN type triode, triode Q2 is the positive-negative-positive triode, the e utmost point of triode Q1 extremely links to each other with the c of triode Q2, the b utmost point of two triodes links to each other with photoelectrical coupler, during switch closure, field effect transistor Q3, it is the N channel enhancement gate field-effect transistor that stretches tight extremely, it is subjected to two triodes to excite the generation nanosecond pulse; Inductance L 1, one end connects the D utmost point of field effect transistor, and the other end connects an electric capacity, the nanosecond pulse effect that it is sent by field effect transistor, and conducting also produces flashy high back voltage; To the charging of described electric capacity, the electric capacity other end connects another inductance L 2, and it is subjected to inductance L 2 multiplication of voltages, makes this electric capacity moment to coupled Schottky diode discharge; Photoelectrical coupler is connected with a NPN type triode and a positive-negative-positive triode constitutes push-pull amplifier and field effect transistor, and the forward end of Schottky diode extremely links to each other with the D of this field effect transistor.

Above-mentioned electronic switch is connected with resistance between two triode Q1 and Q2 and photoelectrical coupler.

After adopting said structure, during use, toggle switch is to " closure " state, and Schmidt's shaping trigger U1 triggers photoelectrical coupler U2, drive push-pull amplifier Q1Q2, excite nanosecond pulse of fet Q3, make LI moment conducting, because the high frequency characteristics of L1, produce the high back voltage of a moment, C1 is charged; Simultaneously, L2 also stops voltage transient to raise, and to the C1 multiplication of voltage, C1 moment discharges to D1, makes it conducting, finishes " closure " action of electronic switch by D2; Toggle switch is to " shutoff " state subsequently, Schmidt's shaping trigger U1 disconnects Q4, finish " shutoff " of electronic switch, compare, this novel electron switch with commonly using electronic switch, can overcome existing defective, utilize Schottky diode to recover fast, low-power consumption, ultrahigh speed characteristics, especially its reverse recovery time is extremely short, forward conduction voltage drop is the characteristics about 0.4V only, realize the triggering speed of the nanosecond utmost point.

Description of drawings

Fig. 1 is the schematic diagram of existing electronic switch;

Fig. 2 is the schematic diagram of existing sealing electronic switch;

Fig. 3 is this novel structural representation.

Embodiment

As shown in Figure 3, the utility model discloses a kind of electronic switch, it comprises Schmidt trigger U1, is used for the paired pulses shaping; Its most important character is can input signal is shaped to the precipitous rectangular pulse in edge changing slowly.Simultaneously, Schmidt trigger also can utilize its hysteresis voltage to improve the antijamming capability of circuit.

Photoelectrical coupler U2 uses and is connected coupling Schmidt trigger U1 and two triode Q1 and Q2;

Triode Q1 is a NPN type triode, triode Q2 is the positive-negative-positive triode, the e utmost point of triode Q1 extremely links to each other with the c of triode Q2, the b utmost point of two triodes links to each other with photoelectrical coupler U2, during switch closure, field effect transistor Q3, it is the N channel enhancement gate field-effect transistor that stretches tight extremely, it is subjected to two triode Q1 and Q2 to excite the generation nanosecond pulse;

Inductance L 1, one end connects the D utmost point of field effect transistor, and the other end connects a capacitor C 1, the nanosecond pulse effect that it is sent by field effect transistor Q3, and conducting also produces flashy high back voltage; To 1 charging of described capacitor C, capacitor C 1 other end connects another inductance L 2, and it is subjected to inductance L 2 multiplication of voltages, makes 1 moment of this capacitor C to coupled Schottky diode D1 discharge;

Photoelectrical coupler U2 is connected with a NPN type triode and a positive-negative-positive triode constitutes push-pull amplifier and field effect transistor Q4, and the forward end of Schottky diode D1 extremely links to each other with the D that the effect pipe is stated in the place.

Be connected with resistance R 2 and R3 between two triode Q1 and Q2 and photoelectrical coupler.

During use, toggle switch 1 is to " closure " state, Schmidt's shaping trigger U1, trigger photoelectrical coupler U2, drive push-pull amplifier Q1Q2, excite nanosecond pulse of fet Q3, make LI moment conducting, because the high frequency characteristics of L1 produces the high back voltage of a moment, and C1 is charged; Simultaneously, L2 also stops voltage transient to raise, and to the C1 multiplication of voltage, C1 moment discharges to D1, makes it conducting, finishes " closure " action of electronic switch by D2; Toggle switch is to " shutoff " state subsequently, and Schmidt's shaping trigger U1 disconnects Q4, finishes " shutoff " of electronic switch.

Claims

1, a kind of electronic switch, it is characterized in that: it comprises Schmidt trigger, is used for the paired pulses shaping; Photoelectrical coupler is used and is connected coupling Schmidt trigger and two triodes (Q1) and (Q2); Triode (Q1) is a NPN type triode, triode (Q2) is the positive-negative-positive triode, the e utmost point of triode (Q1) extremely links to each other with the c of triode (Q2), the b utmost point of two triodes links to each other with photoelectrical coupler, during switch closure, field effect transistor (Q3), it is the N channel enhancement gate field-effect transistor that stretches tight extremely, it is subjected to two triodes to excite the generation nanosecond pulse; Inductance (L1), an end connects the D utmost point of field effect transistor, and the other end connects an electric capacity, the nanosecond pulse effect that it is sent by field effect transistor, conducting also produces flashy high back voltage; To the charging of described electric capacity, the electric capacity other end connects another inductance (L2), and it is subjected to inductance (L2) multiplication of voltage, makes this electric capacity moment to coupled Schottky diode discharge; Photoelectrical coupler is connected with a NPN type triode and a positive-negative-positive triode constitutes push-pull amplifier and field effect transistor, and the forward end of Schottky diode extremely links to each other with the D that the effect pipe is stated in the place.

2, electronic switch according to claim 1 is characterized in that: two triodes (Q1) reach (Q2) and are connected with between photoelectrical coupler resistance.