CN2570811Y

CN2570811Y - Nuclear logging instrument controlled ion source high voltage power switch

Info

Publication number: CN2570811Y
Application number: CN 02256832
Authority: CN
Inventors: 王岩峰
Original assignee: Daqing Petroleum Administration Bureau
Current assignee: Daqing Petroleum Administration Bureau
Priority date: 2002-09-28
Filing date: 2002-09-28
Publication date: 2003-09-03
Anticipated expiration: 2012-09-28

Abstract

The utility model belongs to a nuclear logging instrument controlled ion source high voltage power switch, which is used for petroleum geologic exploration, and neutron burst time can be accurately reflected and accurate geological datum can be provided. The nuclear logging instrument controlled ion source high voltage power switch is composed of synchronous signals SS, a control circuit and a switch circuit, wherein, the width and the frequency of the synchronous signals can be arbitrarily adjusted. The control circuit is composed of U1, U2 and U3, which mainly has the function of generating control signals from S1 to S4 of the switch circuit. Tr1 to Tr8 are formed into four groups of emitting stage followers, and the time of ascending and descending of a switch is reduced. M1 to M12 (N-channel MOSEFT) are formed into four groups of switches from K1 to K4. Because the N-channel MOSFET is used as the switch on the side of a high electric potential, pulse transformers from TF1 to FT4 are used in the circuit to isolate the control circuit and the switch circuit. The start of ion source high voltage pulse of the existing nuclear logging instrument is improved to square wave pulse by the utility model, and the stability of ion source operating status of a neutron generator is improved.

Description

Nuclear logging instrument controllable type ion gun high-voltage electric switch

Technical field

The utility model belongs to petroleum geology exploration nuclear logging instrument controllable type ion gun high-voltage electric switch.

Background technology

At present, nuclear logging instrument neutron generator ion gun high pressure is by sync souce, and on-off circuit and pulse transformer produce.The direct pull switch circuit of sync souce output signal.On-off circuit is made up of the VMOS pipe.Be added in DC voltage in the drain electrode under on-off action, after transformer coupled boosting, at secondary acquisition pulsed ion gun high pressure.Nuclear logging instrument often will according to the purpose of measuring and formation characteristics select best time-program(me) select appropriate from source high-voltage pulse width and frequency very important.And the shape of original ion gun high-voltage pulse is not a square wave completely, time that can not entirely accurate reflection neutron burst.

The utility model content

Technical problem to be solved in the utility model is at the problem that exists in the background technology, can accurately reflect the nuclear logging instrument controllable type ion gun high-voltage electric switch of neutron burst time by the complete square wave of output and provide a kind of.

The invention for solving the technical problem can reach by following technical solution: synchronizing signal is connected on the pin 4 and pin 12 of two monostalbe trigger GB4528B, forms control circuit by respectively being connected to 42 Schmidt's input nand gate CD4093 on the pin 6 of GB4528B and pin 7, pin 10 and the pin 9; The control signal that is produced is connected into each respectively and forms four groups of emitter followers by the base terminal of two triode parallel connections; By each has pulse transformer through electric winding on two transistor emitters of every group of emitter follower, connect three switching tubes and a resistance is formed four groups of on-off circuits on the secondary of every pulse transformer, the drain electrode connecting resistance of back three switching tube circuit final stage switching tubes and the drain electrode of switching tube are connected on the DC voltage; Each connecting resistance between the former limit of preceding two pulse transformers, every pulse transformer of back two pulse transformers; The pin 2 of two monostalbe triggers and pin 1 indirect electric capacity as earth terminal, and pin 3 indirect resistances be+the 15VH incoming end, connect electric capacity as earth terminal between pin 14 and the pin 15, also can do+the 15VH incoming end through resistance.Pin 5,6 connecting resistances at 42 Schmidt's input nand gates are made earth terminal, the pin 7 indirect electric capacity of this pin and two monostalbe triggers; The pin 5,6 of another 42 Schmidt's input nand gates and pin 3 connect electric capacity in parallel after connecting resistance, pin 7 make earth terminal, pin 14 work+15VH incoming ends.

The controllable type ion gun high-voltage electric switch of being made up of above scheme is by synchronizing signal SS, control circuit, and on-off circuit constitutes.The width of synchronizing signal, frequency can be adjusted arbitrarily.U1, U2, U3 forms control circuit, and main effect is the control signal S1 that produces on-off circuit, S2, S3, S4.Tr1 and Tr2, Tr3 and Tr4, Tr5 and Tr6, Tr7 and Tr8 form four groups of emitting stage followers, reduce the rising and the fall time of switch.M1, M2, M3 and M4, M5, M6 and M7, M8, M9 and M10, M11, M12 (N-channel MOS EFT) constitutes four groups of K switch 1, K2, K3, K4.Because N-channel MOS FET constitutes four groups of switches.Because N-channel MOS FET makes the hot side switch, thus pulse transformer TF1 in circuit, adopted, TF2, TF3, TF4 isolates control circuit and on-off circuit.High direct voltage VH (VH＞1000V) through R11---ground connection behind the R18.Always having two groups in one-period leads simultaneously.The conducting relation is as follows: t0-t3 time period K1, K2 close (M3, the short circuit of the M6 drain-source utmost point), K3, and K4 disconnects (M9, the M12 drain-source utmost point opens circuit), Vout=VH.The t1-t2 time period, K1, K2 disconnects (M3, the M6 drain-source utmost point opens circuit), and K3, K4 close (M9, the short circuit of the M12 drain-source utmost point), Vout=OV.Go round and begin again, just form the high pressure Vout of square wave formula pulsation at the output terminal of circuit, its pulsewidth, frequency is subjected to synchro control, voltage magnitude Vout=VH.(the withstand voltage restriction of high workload of the N-channel MOS FET switching tube that uses in the circuit if will obtain higher high pressure output, except that can selecting high pressure resistant pipe for use, also can increase by two groups of switches again, but will consider the phase relation of driving pulse.)

The utility model is compared with background technology has following beneficial effect: this Switching Power Supply is square-wave pulse through improving the beginning that can improve existing nuclear logging instrument ion gun high-voltage pulse.Pulsewidth and frequency are controlled by synchronizing signal, can adjust arbitrarily.Neutron generator ion gun stability under working conditions is improved greatly.

Description of drawings

Accompanying drawing 1 is this on-off circuit schematic diagram;

Accompanying drawing 2 is SS on Fig. 1, S4, S3, S2, S1 and output signal Vout ripple diagrammatic sketch;

Embodiment

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

By shown in Figure 1, with synchronizing signal SS be connected on two monostalbe trigger GB4528B (U1A, on U1B) the pin 4 and pin 12, (U2 U3) forms control circuit by respectively being connected to 42 Schmidt's input nand gate CD4093 on the pin 6 of GB4528B and pin 7, pin 10 and the pin 9; (S3 S4) is connected into each base terminal (Tr8, Tr7 by two triode parallel connections respectively to the control signal that is produced for S1, S2; Tr6, Tr5; Tr4, Tr3; Tr2 Tr1) forms four groups of emitter followers; By on two transistor emitters of every group of emitter follower each through the electricity group (R8, R7, R6, (TF2 TF1), meets three switching tubes (M12, M11, M10 on the secondary of every pulse transformer for TF4, TF3 R5) to be connected to pulse transformer; M9, M8, M7; M6, M5, M4; M3, M2 is M1) with resistance (R17, R15, a R13, R11) form four groups of on-off circuits (K1, K2, K3, K4), back three open pipe circuit final stage switching tube (M12, M9, (R12) drain electrode with switching tube M13 is connected on the DC voltage VH drain D connecting resistance M6) for R16, R14; Preceding two pulse transformers (TF1, TF2), back two pulse transformers (TF3, TF4) each connecting resistance between the former limit of every pulse transformer (R9, R10); Two monostalbe triggers (U1A, pin 2 U1B) and pin 1 indirect capacitor C 1 as earth terminal, and pin 3 indirect resistance R1 be+the 15VH incoming end, connect capacitor C 3 as earth terminal between pin 14 and the pin 15, also can do+the 15VH incoming end through resistance R 3.Pin 5,6 connecting resistance R2 at 42 Schmidt's input nand gate U2 make earth terminal, the pin 7 indirect capacitor C 2 of this pin and two monostalbe trigger U1A; Pin 5,6 at another 42 Schmidt's input nand gate U3 meets capacitor C 4 back connecting resistance R4 in parallel with pin 3, pin 7 is made earth terminal, pin 14 work+15VH incoming ends.

In such scheme, can adopt the two monostalbe trigger U1 of GB4528B type, (U1A U1B) illustrates Fig. 1 by two parts.Triode (Tr1, Tr3, Tr5, Tr7) can adopt 3CG11C type, (Tr2, Tr4, Tr6, Tr8) can adopt the 3DK2B type, switching tube (M1, M3, M4, M5, M7, M8 M11) can adopt IRDF120 type, (M2, M6, M9) can adopt the IRFB30 type, their N-channel MOS FET constitutes four groups of switches (K1, K2, K3, K4).

Claims

1, a kind of nuclear logging instrument controllable type ion gun high-voltage electric switch that relates to, it is to be gone up by the synchronizing signal (SS) of synchronous generator output and high direct voltage (VH) to constitute, and it is characterized in that:

A, with synchronizing signal (SS) be connected on two monostalbe trigger GB4528B (U1A, on U1B) the pin 4 and pin 12, (U2 U3) forms control circuit by respectively being connected to 42 Schmidt's input nand gate CD4093 on the pin 6 of GB4528B and pin 7, pin 10 and the pin 9;

(S3 S4) is connected into each base terminal (Tr8, Tr7 by two triode parallel connections respectively for S1, S2 for b, the control signal that produced; Tr6, Tr5; Tr4, Tr3; Tr2 Tr1) forms four groups of emitter followers;

C, by on two transistor emitters of every group of emitter follower each through the electricity group (R8, R7, R6, (TF2 TF1), meets three switching tubes (M12, M11, M10 on the secondary of every pulse transformer for TF4, TF3 R5) to be connected to pulse transformer; M9, M8, M7; M6, M5, M4; M3, M2 is M1) with resistance (R17, R15, a R13, R11) form four groups of on-off circuits (K1, K2, K3, K4), back three open pipe circuit final stage switching tube (M12, M9, (R12) drain electrode with switching tube (M13) is connected on the DC voltage (VH) drain electrode M6) (D) connecting resistance for R16, R14;

D, preceding two pulse transformers (TF1, TF2), back two pulse transformers (TF3, TF4) each connecting resistance between the former limit of every pulse transformer (R9, R10);

E, at two monostalbe trigger (U1A, U1B) pin 2 and pin 1 indirect electric capacity (C1) as earth terminal, and pin 3 indirect resistances (R1) be+the 15VH incoming end, connect electric capacity (C3) between pin 14 and the pin 15 as earth terminal, also can do+the 15VH incoming end through resistance (R3).

F, make earth terminal, the pin 7 indirect electric capacity (C2) of this pin and two monostalbe triggers (U1A) at pin 5,6 connecting resistances (R2) of 42 Schmidt's input nand gates (U2); Pin 5,6 at another 42 Schmidt's input nand gates (U3) connects electric capacity (C4) back in parallel connecting resistance (R4) with pin 3, pin 7 is made earth terminal, pin 14 work+15VH incoming ends.