CN205105180U - Synchronous triggering signal circuit of all solid state high -pressure nanosecond pulser - Google Patents

Abstract

The utility model discloses a synchronous trigger signal circuit of an all-solid-state high-voltage nanosecond pulse generator, which comprises a multivibrator and a trigger pulse generating circuit. The oscillation signal generated by the oscillator outputs a pulse signal. The utility model adopts the current sensor to collect the pulse current on the load, which is reliable in real time; the method adopted by the utility model is relatively simple to realize, and the used devices can be easily obtained.

Description

All-solid-state high-voltage nanosecond pulse generator synchronous trigger signal circuit

technical field

The utility model belongs to the technical field of electric equipment, relates to a circuit capable of generating nanosecond-level trigger pulses, in particular to a synchronous trigger signal circuit of an all-solid-state high-voltage nanosecond pulse generator.

Background technique

The 555 timer circuit was first developed to replace the medium-scale integrated circuit that combines the analog function and digital function of the traditional mechanical timer with large volume and low precision and reliability. It has high timing accuracy and reliability, and temperature drift. It has many advantages such as small performance, fast operation speed, and direct interconnection with other digital circuits to enrich its functions. It is more flexible and convenient to use in actual circuit development. It only needs to combine a few resistance-capacitance components with the required functional peripherals to complete functions such as monostable, multivibrator, and Schmitt triggers. At the same time, because of its low price, perfect and stable technical performance and high cost performance, it is welcomed by the majority of digital circuit users and electrical and electronic professionals. 555 timer circuits are widely used

It is used in functional circuits such as signal generation, conversion, control, and detection. To sum up, the present application proposes a design scheme for a synchronous trigger signal of an all-solid-state high-voltage nanosecond pulse generator.

Utility model content

In view of this, the purpose of the utility model is to provide an all-solid-state high-voltage nanosecond pulse generator synchronous trigger signal circuit.

The purpose of this utility model is achieved through the following technical solutions, a synchronous trigger signal circuit of an all-solid-state high-voltage nanosecond pulse generator, including a multivibrator and a trigger pulse generating circuit, and the multivibrator is used to generate an oscillating signal , the trigger pulse generating circuit outputs a pulse signal according to the oscillation signal generated by the multivibrator.

Further, the multivibrator includes a 555 timer, a first resistor R1, a second resistor R2, a first capacitor C1 and a second capacitor C2, the second resistor is a variable resistor, and 4 of the 555 timer Pin and pin 8 are connected to the power signal, pin 1 of the 555 timer is grounded, and pin 5 is grounded through the first capacitor; one end of the first resistor is connected to the power supply, the other end of the first resistor is connected to the second resistor, and the second resistor Grounded via the second capacitor, pin 7 of the 555 timer is connected to the common end of the first resistor and the second resistor, pin 2 of the 555 timer is connected to pin 6 and the connection end is connected to the second resistor and the second capacitor The common terminal of the 555 timer is connected to the trigger pulse generation circuit as the output terminal.

Further, the trigger pulse generating circuit includes a monostable flip-flop SN74LS123, a double rising edge D flip-flop SN74LS74A, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a third capacitor C3, a Four capacitors C4 and the fifth capacitor C5, one end of the third resistor is connected to the power supply, the other end of the third resistor is grounded through the third capacitor, and the common ends of the third resistor and the third capacitor are respectively connected to the monostable trigger The 3 pins and 11 pins of the SN74LS123 are connected; the 3 pins of the 555 timer are respectively connected with the 2 pins and the 10 pins of the monostable flip-flop SN74LS123; the 14 pins and the 15 pins of the monostable flip-flop SN74LS123 are connected in parallel The fourth capacitor, the 15 pins of the monostable trigger SN74LS123 are connected to the power supply through the fourth resistor and the 5th resistor connected in sequence, the fifth capacitor is connected in parallel between the 6 pins and the 7 pins of the monostable trigger SN74LS123, And pin 7 is connected to the power supply through the sixth resistor; pin 13 of the monostable flip-flop SN74LS123 is connected to pin 1 of the double rising edge D flip-flop SN74LS74A, pin 12 is connected to pin 3 of the double rising edge D flip-flop SN74LS74A, Pin 2 and pin 4 of the double rising edge D flip-flop SN74LS74A are respectively connected to the power supply.

Owing to adopting above-mentioned technical scheme, the utility model has following advantage:

1. The utility model adopts the current sensor to collect the pulse current on the load, which is real-time and reliable;

2. The method adopted by the utility model is relatively simple to realize, and the used devices can be easily obtained.

Description of drawings

In order to make the purpose, technical solutions and advantages of the present utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings, wherein:

Fig. 1 is a block diagram of the utility model;

Fig. 2 is a schematic block diagram of a synchronous trigger signal circuit of an all-solid-state high-voltage nanosecond pulse generator;

Fig. 3 is the wave form diagram that all-solid-state high voltage nanosecond pulse generator 555 forms multivibrator;

Figure 4 is a nanosecond pulse trigger circuit of an all-solid-state high-voltage nanosecond pulse generator.

detailed description

The preferred embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings; it should be understood that the preferred embodiments are only for illustrating the present utility model, rather than limiting the protection scope of the present utility model.

As shown in Figure 1, the synchronous trigger signal circuit is composed of 555 timer, 74LS123 chip and 74LS74 chip. The 555 timer builds a multivibrator, and the combination of 74LS123 and 74LS74 builds a trigger pulse capable of generating nanoseconds. circuit. The trigger pulse generated by the synchronous trigger signal circuit has a trigger pulse amplitude of 5V and a pulse width of 5-1250ns.

The multivibrator includes a 555 timer, a first resistor R1, a second resistor R2, a first capacitor C1 and a second capacitor C2, the second resistor is a variable resistor, the 4 pins of the 555 timer and Pin 8 is connected to the power signal, pin 1 of the 555 timer is grounded, and pin 5 is grounded through the first capacitor; one end of the first resistor is connected to the power supply, the other end of the first resistor is connected to the second resistor, and the second resistor is connected to the second resistor through the first capacitor. The two capacitors are grounded, the 7 pins of the 555 timer are connected to the common end of the first resistor and the second resistor, the 2 pins of the 555 timer are connected to the 6 pins and the connection end is connected to the common of the second resistor and the second capacitor The terminal is connected, and the 3 pin of the 555 timer is used as an output terminal to connect with the trigger pulse generation circuit.

As shown in Figure 2, a multivibrator is composed of a 555 timer and external components R ₁ , R ₂ , and C, and pin 2 is directly connected to pin 6. The circuit has no steady state, only two temporary steady states, and the circuit does not need an external trigger signal. The power supply is used to charge C through R ₁ and R ₂ , and C discharges to the discharge terminal D _c through R ₂ to make the circuit oscillate. Capacitor C is charged and discharged between 2/V _CC and 1/V _CC , so that a series of rectangular waves are obtained at the output terminal, and the corresponding waveforms are shown in Figure 2.

The time parameter of the output signal is: T=t _w1 +t _w2

t _w1 =0.7(R ₁ +R ₂ )C

t _w2 =0.7R ₂ C

Among them, t _w1 is the time required for V _C to rise from 1/3V _CC to 2/3V _CC , and t _w2 is the time required for capacitor C to discharge.

In this circuit, R ₁ selects a 220Ω resistor, R ₂ is a sliding rheostat from 0 to 50kΩ, and the capacitor C is 4.7uF. According to the calculation formula of the time parameter of the output signal above, it can be obtained that the frequency of the output signal can be at least about 2 Hz.

The stability of the external components determines the stability of the multivibrator, and the 555 timer can obtain a high-precision oscillation frequency and a strong power output capability with a small number of components.

As shown in Figure 3, the trigger pulse generation circuit includes a monostable flip-flop SN74LS123, a double rising edge D flip-flop SN74LS74A, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a third resistor Capacitor C3, fourth capacitor C4 and fifth capacitor C5, one end of the third resistor is connected to the power supply, the other end of the third resistor is grounded through the third capacitor, and the common ends of the third resistor and the third capacitor are respectively connected to 3 pins and 11 pins of the monostable trigger SN74LS123 are connected; 3 pins of the 555 timer are respectively connected with 2 pins and 10 pins of the monostable trigger SN74LS123; 14 pins of the monostable trigger SN74LS123 are connected with The fourth capacitor is connected in parallel between the 15 pins, the 15 pins of the monostable trigger SN74LS123 are connected to the power supply through the fourth resistor and the fifth resistor connected in sequence, and the 6 pins and the 7 pins of the monostable trigger SN74LS123 are connected in parallel The fifth capacitor, and the 7th pin is connected to the power supply through the sixth resistor; the 13th pin of the monostable flip-flop SN74LS123 is connected to the 1st pin of the double rising edge D flip-flop SN74LS74A, and the 12th pin is connected to the double rising edge D flip-flop SN74LS74A 3-pin connection, the 2-pin and 4-pin of the double rising edge D flip-flop SN74LS74A are respectively connected to the power supply.

This circuit uses two one-shot timers and a D flip-flop to generate short pulses that, when subjected to a TTL-compatible positive rising edge, generate positive pulses. IC _1B provides a fixed pulse with a width of about 250ns. IC _1A can provide a variable pulse with a width of _250-1500ns by adjusting the sliding rheostat R5. When a positive pulse at input A triggers each timer, the trigger pulse output from IC _1A blocks IC _2A 's CLR input and causes its CK signal to go low. When IC1B's trigger pulse times out, its rising edge registers the time from a logic 1 at the D input of IC _2A to the B output. When IC _1A 's trigger pulse times out, its output clears IC _2A 's Q output, which weakens the B output. Therefore, the B output pulses as follows:

Pulse width of IC _2A = pulse width of IC _1A - pulse width of IC _1B

The output pulse width of the circuit is variable in the range of 5-1250ns, and a faster logic circuit can be used to generate shorter pulses.

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. Obviously, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the utility model. In this way, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and equivalent technologies thereof, the utility model is also intended to include these modifications and variations.

Claims (3)

1. an all-solid-state high-voltage nanosecond pulse generator synchronous trigger signal circuit, is characterized in that: comprise multivibrator and trigger pulse generation circuit, described multivibrator is used for generating oscillation signal, trigger pulse generation circuit according to multiple The oscillation signal generated by the harmonic oscillator outputs a pulse signal. 2. the all-solid-state high-voltage nanosecond pulse generator synchronous trigger signal circuit according to claim 1, is characterized in that: described multivibrator comprises 555 timers, the first resistance (R1), the second resistance (R2) , the first capacitor (C1) and the second capacitor (C2), the second resistor is a variable resistor, the 4 pins and 8 pins of the 555 timer are connected to the power signal, the 1 pin of the 555 timer is grounded, and the 5 pins Grounded through the first capacitor; one end of the first resistor is connected to the power supply, the other end of the first resistor is connected to the second resistor, the second resistor is grounded through the second capacitor, and pin 7 of the 555 timer is connected to the first resistor It is connected to the common end of the second resistor, the 2 pin of the 555 timer is connected to the 6 pin and the connecting end is connected to the common end of the second resistor and the second capacitor, and the 3 pin of the 555 timer is used as the output end and the trigger The pulse generating circuit is connected. 3. The all-solid-state high-voltage nanosecond pulse generator synchronous trigger signal circuit according to claim 2 is characterized in that: the trigger pulse generation circuit includes a monostable flip-flop SN74LS123, a double rising edge D flip-flop SN74LS74A, a third Resistor (R3), fourth resistor (R4), fifth resistor (R5), sixth resistor (R6), third capacitor (C3), fourth capacitor (C4) and fifth capacitor (C5), the first One end of the three resistors is connected to the power supply, the other end of the third resistor is grounded through the third capacitor, and the common ends of the third resistor and the third capacitor are respectively connected to pins 3 and 11 of the monostable flip-flop SN74LS123; The 3 pins of the 555 timer are respectively connected with the 2 pins and 10 pins of the monostable trigger SN74LS123; the fourth capacitor is connected in parallel between the 14 pins and the 15 pins of the monostable trigger SN74LS123, and the monostable trigger SN74LS123 The 15 pins of the SN74LS123 are connected to the power supply through the fourth resistor and the fifth resistor connected in sequence, the fifth capacitor is connected in parallel between the 6 pins and the 7 pins of the monostable flip-flop SN74LS123, and the 7 pins are connected to the power supply through the sixth resistor; Pin 13 of the monostable flip-flop SN74LS123 is connected to pin 1 of the double-rising edge D flip-flop SN74LS74A, pin 12 is connected to pin 3 of the double-rising D flip-flop SN74LS74A, pin 2 of the double-rising edge D flip-flop SN74LS74A is connected to pin 4 The pins are respectively connected to the power supply.