CN101799538A - Digitalized ultrasonic receiving conditioning circuit - Google Patents
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Abstract
The invention discloses a digitalized ultrasonic receiving conditioning circuit, which belongs to electronic devices. The gain of the circuit is controlled by adopting a mode with the combination of a fixed gain and a variable gain, wherein the variable gain is realized by a voltage-controlled amplifier; and the gate position and the gate width of an echo signal are controlled by controlling the working state of a triode, wherein the working state of the triode is controlled by external input signals. The digitalized ultrasonic receiving conditioning circuit solves the problems of the gain of the circuit essentially and the automatic control of the gate position and the gate width of the echo signal, and has certain universality and practicability; besides, the circuit is simple, is convenient to use and maintain, and has a low cost.
Description
Affiliated technical field
The present invention proposes a kind of digitalized ultrasonic receiving conditioning circuit that belongs to electronic installation, especially can thoroughly solve in ultrasonic receiving conditioning circuit, and first usefulness is regulated the gain that replaces the manual adjustments control circuit automatically; Second usefulness is regulated door position, the gate-width that replaces manual adjustments control echoed signal automatically.
Background technology
Ultrasonic receiving conditioning circuit is the core of ultrasonic testing system, and it has directly determined the overall performance of system.In the present ultrasonic receiving conditioning circuit: (1) changes its resistance by the manual adjustments potentiometer, the regulating circuit gain; (2) change its resistance by the manual adjustments potentiometer, regulate door position, the gate-width of echoed signal.Have some problems like this: (1) has increased the requirement to operating personnel virtually.The manual adjustments potentiometer, the circuit that requires operating personnel to be familiar with being correlated with; (2) control accuracy is not high.The manual adjustments potentiometer, the notion of the amount of not having, thus during assurance that will degree of having, must the dependence experience, and this degree is also difficult holds, so control accuracy also can be high; (3) life-span is short.The potentiometer of manual adjustments belongs to a kind of mechanical organ, is exactly the serviceable life of reducing it to its operation; (4) inconvenient operation.When the manual adjustments potentiometer, should see potentiometer on the one hand, view screen all makes troubles for debugging, operation, maintenance again; When a plurality of manual adjustments potentiometer is arranged in the circuit, easily produce maloperation on the other hand.
Summary of the invention
In order to pass through hand from solving present ultrasonic receiving conditioning circuit in essence, the door position of regulating circuit gain, echoed signal, gate-width, the present invention proposes a kind of digitalized ultrasonic receiving conditioning circuit, and it adopts digitized mode, the door position of auto-adjusting circuit gain and echoed signal, gate-width.
The technical solution adopted for the present invention to solve the technical problems: the gain of the mode control circuit that employing fixed gain and variable gain combine, wherein variable gain realizes by voltage-controlled amplifier; By the duty of control triode, realize door position, the gate-width control of echoed signal, wherein the duty of triode provides signal to control by the outside.Its structure is seen Fig. 1: composition frame chart of the present invention, voltage follow module wherein, attenuation module, voltage-controlled amplification module, anti-phase amplification module, noise suppression module, homophase amplification module, monostable trigger module, echo be door position, gate-width control module once, echo secondary door position, gate-width control module, peak are protected module order electrical connection successively.In order to express conveniently, provide Fig. 2: echoed signal door position, gate-width synoptic diagram.
Beneficial effect of the present invention: propose a kind of digitalized ultrasonic receiving conditioning circuit, regulate automatically, replace relevant manual adjustments by door position, the gate-width of program control realization circuit gain and echoed signal.In addition, circuit proposed by the invention is simple, cheap, and installation, easy to use, and has certain versatility and practicality.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is a composition frame chart of the present invention.
Fig. 2 is door position, the gate-width synoptic diagram of echoed signal.
Fig. 3 is circuit theory diagrams of the present invention.
Among Fig. 1,1. voltage follow module, 2. attenuation module, 3. voltage-controlled amplification module, 4. anti-phase amplification module, 5. noise suppression module, 6. homophase amplification module, 7. monostable trigger module, 8. once door position, gate-width control module of echo, 9. echo secondary door position, gate-width control module, 10. module is protected at the peak.
Among Fig. 2,1. trigger pip, 2. echoed signal, i.e. received signal, 3. echo door position, 4. echo gate-width.
Among Fig. 3, provided concrete title and the annexation of device among the present invention: wherein
(1) in the voltage follow module, 1,2 pin of operational amplifier (U1A) are electrically connected, and a pin of resistance (RA1) is electrically connected with 8 pin of U1A, and another pin is electrically connected with+5V; One pin of electric capacity (CA1) is electrically connected with 8 pin of U1A, another pin be electrically connected; One pin of resistance (RA7) is electrically connected with 4 pin of U1A, and another pin is electrically connected with-5V; One pin of electric capacity (CA2) is electrically connected with 4 pin of U1A, another pin be electrically connected; The in-phase end of diode (DA1) be electrically connected, end of oppisite phase is electrically connected with 3 pin of U1A; The in-phase end of diode (DA2) is electrically connected with 3 pin of U1A, end of oppisite phase be electrically connected; One pin of resistance (RA4) is electrically connected with 3 pin of U1A, and the pin that is connected with resistance (RA5) in another pin and the resistance (RA3) is electrically connected; One pin of resistance (RA5) be electrically connected, another pin is electrically connected with RA3; One pin of resistance (RA3) is electrically connected with the output (Vin) of receiving transducer, and another pin is electrically connected simultaneously with RA4 and RA5;
(2) in the attenuation module, potentiometer (WA1) end is electrically connected with resistance (RA2), and the other end is electrically connected with resistance (RA6), and slide head is electrically connected with electric capacity (CB3); One pin of resistance (RA2) is electrically connected with 1 pin of U1A, and another pin is electrically connected with WA1; One pin of resistance (RA6) is electrically connected with WA1, another pin be electrically connected;
(3) in the voltage-controlled amplification module, a pin of electric capacity (CB3) is electrically connected with the slide head of WA1, and another pin is electrically connected with 3 pin of voltage-controlled amplifier (U2); One pin of resistance (RB2) is electrically connected with 3 pin of U2, another pin be electrically connected; 2 pin of reference voltage chip (P1) are electrically connected with 2 pin of U2,3 pin of P1 be electrically connected; One pin of resistance (R1) is electrically connected with 2 pin of P1, and another pin is electrically connected with+5V; One pin of resistance (RB1) is electrically connected with 8 pin of U2, and another pin is electrically connected with+5V; One pin of electric capacity (CB1) is electrically connected with 8 pin of U2, another pin be electrically connected; One pin of resistance (RB5) is electrically connected with 6 pin of U2, and another pin is electrically connected with-5V; One pin of electric capacity (CB6) is electrically connected with 6 pin of U2, another pin be electrically connected; One pin of resistance (RB3) is electrically connected with 5 pin of U2, and another pin is electrically connected with 7 of U2; One pin of electric capacity (CB2) is electrically connected with 7 pin of U2, and another pin is electrically connected with a pin of resistance (RB4), another pin of RB4 be electrically connected; The pin that is connected with CB2 among one pin of electric capacity (CB4) and the RB4 is electrically connected, another pin be electrically connected; One pin of resistance (CZB1) is electrically connected with 1 pin of U2, and another pin is electrically connected with outside voltage-controlled input signal (VC1); One pin of electric capacity (CB5) is electrically connected with 1 pin of U2, another pin be electrically connected;
(4) in the anti-phase amplification module, the pin that is connected with RB4 among a pin of resistance (RC5) and the CB4 is electrically connected, and another pin is electrically connected with 6 pin of operational amplifier (U1B); One pin of electric capacity (CC6) is electrically connected with 5 pin of U1B, another pin be electrically connected; One pin of resistance (RC8) is electrically connected with 5 pin of U1B, another pin be electrically connected; One pin of electric capacity (CC1) is electrically connected with 6 pin of U1B, and another pin is electrically connected with 7 pin of U1B; One pin of electric capacity (RC2) is electrically connected with 6 pin of U1B, and another pin is electrically connected with 7 pin of U1B;
(5) in the noise suppression module, a pin of resistance (RC6) is electrically connected with 7 pin of U1B, and another pin is electrically connected with the in-phase end of diode (DD1), and the end of oppisite phase of DD1 is connected with the positive electrical of electric capacity (CD2); One pin of resistance (RD5) is connected with the positive electrical of CD2, and another pin is electrically connected with the slide head of potentiometer (WT1), the end of WT1 be electrically connected, the other end is electrically connected with a pin of resistance (RT1), another pin of RT1 is electrically connected with+5V;
(6) in the homophase amplification module, the positive pole of electric capacity (CD2) is electrically connected with the end of oppisite phase of DD1, and a pin of the negative pole resistance (RD4) of CD2 is electrically connected, and another pin of RD4 is electrically connected with 3 pin of operational amplifier (U4); One pin of resistance (RD6) is electrically connected with 3 pin of U4, another pin be electrically connected; One pin of resistance (RD3) is electrically connected with 2 pin of U4, another pin be electrically connected; One pin of resistance (RD1) is electrically connected with 2 pin of U4, and another pin is electrically connected with 6 pin of U4; One pin of resistance (RD2) is electrically connected with 7 pin of U4, and another pin is electrically connected with+12V; One pin of electric capacity (CD1) is electrically connected with 7 pin of U4, another pin be electrically connected; One pin of resistance (RD7) is electrically connected with 4 pin of U4, and another pin is electrically connected with-12V; One pin of electric capacity (CD4) is electrically connected with 4 pin of U4, another pin be electrically connected;
(7) in the monostable trigger module, 3,13,16 pin of monostalbe trigger (U5) are electrically connected with+12V, 4,8,12 pin of U5 be electrically connected, 5 pin of U5 are electrically connected with the trigger pip (CF) of outside input, 6, the 11 pin electrical connection of U5; One pin of electric capacity (CM1) is electrically connected with 1 pin of U5, and another pin is electrically connected with 2 pin of U5; One pin of resistance (RM1) is electrically connected with 2 pin of U5, and another pin is electrically connected with the slide head of potentiometer (ZMQ1), and the end of ZMQ1 is electrically connected with+12V; One pin of electric capacity (CM2) is electrically connected with 15 pin of U5, and another pin is electrically connected with 14 pin of U5; One pin of resistance (RM2) is electrically connected with 14 pin of U5, and another pin is electrically connected with the slide head of potentiometer (ZMK1), and the end of ZMK1 is electrically connected with+12V;
(8) once in door position, the gate-width control module, the negative pole of electric capacity (CJ1) is electrically connected with 6 pin of U4 echo, and positive pole is electrically connected with the base stage of triode (Q1), and the collector of Q1 is electrically connected with+12V; One pin of resistance (RJ1) is electrically connected with+12V, and another pin is electrically connected with the base stage of Q1; One pin of resistance (RJ4) be electrically connected, another pin is electrically connected with the base stage of Q1; One pin of resistance (RJ8) be electrically connected, another pin is electrically connected with the emitter of Q1; One pin of resistance (RJ3) is electrically connected with the emitter of Q1, and another pin is electrically connected with the collector of triode (Q3); One pin of resistance (RJ6) and 9 pin of U5 be electrically connected, another pin is electrically connected with the base stage of Q3, the emitter of Q3 be electrically connected; The negative pole of electric capacity (CJ2) is electrically connected with the collector of Q3, anodal is electrically connected with the base stage of triode (Q2), and the collector of Q2 is electrically connected with+12V; One pin of resistance (RJ2) is electrically connected with+12V, and another pin is electrically connected with the base stage of Q2; One pin of resistance (RJ5) be electrically connected, another pin is electrically connected with the base stage of Q2; One pin of resistance (RJ7) be electrically connected, another pin is electrically connected with the emitter of Q2;
(9) in echo secondary door position, the gate-width control module, one pin of resistance (RF2) is electrically connected with external door position, gate-width control input signals (MK), another pin is electrically connected with the base stage of triode (Q4), the emitter of Q4 be electrically connected, 6 pin that chip (U6) is protected at the collector of Q4 and peak are electrically connected; One pin of resistance (RF1) is electrically connected with the emitter of Q2, and another pin is electrically connected with the collector of Q4;
(10) peak is protected in the module, 1,14 pin that chip (U6) is protected at the peak are electrically connected with outside peaks guarantor's control input signals (RST-PDK01), 5,9,3 pin of U6 are electrically connected with the end of oppisite phase of diode (DZ1), the in-phase end of DZ1 be electrically connected, 8,13 pin of U6 be electrically connected; One pin of resistance (RF4) is electrically connected with 2 pin of U6, and another pin is electrically connected with+12V; One pin of electric capacity (CF3) is electrically connected with 2 pin of U6, another pin be electrically connected; One pin of resistance (RF3) is electrically connected with 7 pin of U6, and another pin is electrically connected with-12V; One pin of electric capacity (CF2) is electrically connected with 7 pin of U6, another pin be electrically connected; One pin of electric capacity (CF1) is electrically connected with 4 pin of U6, and another pin is electrically connected with 8 of U6;
In order to express conveniently, provide table 1: the inventory of core devices in the digitalized ultrasonic receiving conditioning circuit that the present invention proposes.
Embodiment
In the embodiment shown in fig. 1, voltage follow module (1) selects for use the A road amplifier among the dual operational amplifier AD8032 to form the realization of emitter voltage follow circuit; Attenuation module (2) is selected for use the manual potentiometer of 100k Ω to form the resistance in series bleeder circuit and is realized; Voltage-controlled amplification module (3) selects for use voltage-controlled amplifier AD603 to realize; Anti-phase amplification module (4) is selected for use the B road amplifier among the dual operational amplifier AD8032 to form anti-phase scale operation amplifying circuit and is realized; Noise suppression module (5) selects for use the manual potentiometer of 10k Ω to form the resistance in series bleeder circuit and diode 2AP9 realizes; Homophase amplification module (6) is selected for use single operational amplifier A D844 to form the in-phase proportion operational amplification circuit and is realized; Monostable trigger module (7) selects for use two-way monostalbe trigger HEF4538 to realize; Echo once door position, gate-width control module (8) selects for use the output of single-shot trigger circuit to control the conducting state of NPN type triode 9013, and the switching of control echoed signal transmission realizes; Echo secondary door position, gate-width control module (9) are selected the conducting state of external input signal control NPN type triode 9013 for use, and the switching of control echoed signal transmission realizes; The peak is protected module (10) and is selected for use the peak to protect chip PDK01 realization.
In embodiment illustrated in fig. 2, trigger pip (1) refers to the trigger pip of ultrasound emission probe; Echoed signal (2) refers to the echoed signal that ultrasonic receiving transducer receives, and is called for short echoed signal; Echo door position (3) refers to beginning to the mistiming that effective echoed signal begins occurring of trigger pip, and unit is μ s; Echo gate-width (4) refers to that effective echoed signal begins the mistiming that finishes to effective echoed signal, and unit is μ s.
The inventory of core devices in the digitalized ultrasonic receiving conditioning circuit that table 1 the present invention proposes
| Title | Function or model | Quantity (only) |
| ??AD8032 | Dual operational amplifier | ??1 |
| ??LM336-2.5 | 2.5 volt reference voltage chip | ??1 |
| ??AD603 | Voltage-controlled amplifier | ??1 |
| ??AD844 | Single operational amplifier | ??1 |
| ??HEF4538 | The two-way monostalbe trigger | ??1 |
| ??PDK01 | Process chip is protected at the peak | ??1 |
| ??IN4148 | Unidirectional conducting diode | ??2 |
| ??2AP9 | Schottky diode | ??1 |
| Voltage stabilizing diode | 4.7V voltage stabilizing diode | ??1 |
| ??9013 | NPN type triode | ??4 |
| Potentiometer | ??100K | ??1 |
| Potentiometer | ??10K | ??3 |
In the embodiment shown in fig. 3, wherein
(1) circuit of voltage follow module shows: with 1, the 3 pin short circuits of dual operational amplifier AD8032, i.e. and end of oppisite phase and output terminal short circuit, signal is imported by in-phase end, forms typical voltage emitter follower circuit, improves the input impedance of circuit; The series connection bleeder circuit that echo input signal Vin forms through resistance R A3 and RA5 is again through diode DA2, DA1 clamper, to sealing in high pressure in the echoed signal amplitude limit that transmits;
(2) circuit of attenuation module shows: resistance R A2, RA6 and potentiometer WA1 are formed the resistance in series bleeder circuit, when regulating the slide head of WA1, can change the magnitude of voltage of 3 pin input signals among the AD603, thereby change the entire circuit gain, the digitalized ultrasonic receiving conditioning circuit that the present invention is proposed has certain flexibility, applicable to multiple ultrasonic testing system; Wherein the range of adjustment of this attenuation module is 0～60dB;
(3) circuit of voltage-controlled amplification module shows: the mode of operation that voltage-controlled amplifier AD603 is designed to 0～40dB; In two voltage-controlled signals that AD603 needs, voltage-controlled signal provides the DC voltage of 2.5V by reference voltage chip LM3362.5, and another voltage-controlled signal is provided by the outside, i.e. VC1; The gain of AD603 changes according to fixing mathematical relation according to VC1, and VC1 is a program-controlled signal, thereby realizes the automatic control of the entire gain of the digitalized ultrasonic receiving conditioning circuit that the present invention proposes by VC1;
(4) circuit of anti-phase amplification module shows: signal is by the end of oppisite phase 6 pin input of AD8032, and typical anti-phase scale operation amplifying circuit is formed in the output of 7 pin; The resistance of resistance R C5, RC2 is respectively 200 Ω, 2400 Ω, so the gain of this anti-phase amplification module is 12 times;
(5) circuit of noise suppression module shows: resistance R T1 and potentiometer WT1 are formed the resistance in series bleeder circuit, and when regulating the slide head of WT1, the magnitude of voltage of in-phase end in the time of can changing diode DD1 conducting; Noise figure in the ifs circuit is bigger, and the magnitude of voltage of in-phase end increased when the slide head of adjusting WT1 made the DD1 conducting, suppressed noise; Noise figure in the ifs circuit is little, and the magnitude of voltage of in-phase end reduced when the slide head of adjusting WT1 made the DD1 conducting, kept echoed signal;
(6) circuit of homophase amplification module shows: signal is by the in-phase end 3 pin input of AD844, and typical in-phase proportion operational amplification circuit is formed in the output of 6 pin; The resistance of resistance R D3, RD1 is respectively 100 Ω, 470 Ω, so the gain of this homophase amplification module is 5.7 times;
(7) circuit of monostable trigger module shows: with the RC filtering circuit of resistance R M1, potentiometer ZMQ1 and capacitor C M1 composition, insert time control 1,2 pin of two-way monostalbe trigger HEF4538, external trigger control signal CF is inserted the triggering of HEF4538 and control 5 pin, realize that first via monostable triggers; RC filtering circuit with resistance R M2, potentiometer ZMK1 and capacitor C M2 composition, insert time control 14,15 pin of two-way monostalbe trigger HEF4538, the monostable triggering of the first via is exported the triggering of 6 pin access HEF4538 and control 11 pin, realize that the second tunnel monostable triggers; With output 9 pin that the second tunnel monostable triggers, the duty of control triode Q3; Wherein, by regulating the slide head of ZMQ1, ZMK1, can change the time that first via monostable triggers, the second tunnel monostable triggers respectively;
(8) echo once the circuit of door position, gate-width control module show: when triode Q3 conducting, echoed signal forbids being transferred to Q2 from Q1; When triode Q3 ended, echoed signal allowed to be transferred to Q2 from Q1; Q3 conducting or the output control that triggers by the second tunnel monostable by HEF4538, the slide head of adjusting ZMQ1, ZMK1 can change echoed signal once door position, gate-width control respectively; By echoed signal once door position, gate-width control both can thoroughly suppress to seal in transmitting in the echoed signal, can be convenient to echo secondary door position, gate-width control again and observe; Wherein after detection system was determined, echo once door position, gate-width control did not need to regulate again;
(9) circuit of echo secondary door position, gate-width control module shows: when triode Q4 conducting, echoed signal forbids that being transferred to the peak from Q2 protects chip; When triode Q4 ended, echoed signal allowed to be transferred to the peak from Q2 and protects chip; Q4 conducting or the gate-control signal MK that ends by the outside input control, thereby realize secondary door position, the gate-width control of echoed signal; MK belongs to a program control signal, thereby by the door position of echoed signal in the digitalized ultrasonic receiving conditioning circuit of its realization the present invention proposition, the automatic control of gate-width;
(10) the peak circuit of protecting module shows: 1, the 14 pin short circuits of chip PDK01 are protected at the peak, and the duty of the input signal RST-PDK01 control PDK01 by the outside, i.e. sampling still keeps; Export the final output of the digitalized ultrasonic receiving conditioning circuit that i.e. the present invention proposes behind the voltage stabilizing diode DZ1 amplitude limit of 3 pin of PDK01 (output is protected at the peak) by 4.7V.
Claims (11)
1. digitalized ultrasonic receiving conditioning circuit that belongs to electronic installation, it is characterized in that: the voltage follow module, attenuation module, voltage-controlled amplification module, anti-phase amplification module, noise suppression module, homophase amplification module, monostable trigger module, echo be door position, gate-width control module once, echo secondary door position, gate-width control module, peak are protected module order electrical connection successively;
2. digitalized ultrasonic receiving conditioning circuit according to claim 1, it is characterized in that: in the voltage follow module, 1,3 pin short circuits with dual operational amplifier AD8032, be end of oppisite phase and output terminal short circuit, signal is imported by in-phase end, form typical voltage emitter follower circuit, improve the input impedance of circuit; The series connection bleeder circuit that echo input signal Vin forms through resistance R A3 and RA5 is again through diode DA2, DA1 clamper, to sealing in high pressure in the echoed signal amplitude limit that transmits;
3. digitalized ultrasonic receiving conditioning circuit according to claim 1, it is characterized in that: in attenuation module, resistance R A2, RA6 and potentiometer WA1 are formed the resistance in series bleeder circuit, when regulating the slide head of WA1, can change the magnitude of voltage of 3 pin input signals among the AD603, thereby change the entire circuit gain, the digitalized ultrasonic receiving conditioning circuit that the present invention is proposed has certain flexibility, applicable to multiple ultrasonic testing system; Wherein the range of adjustment of this attenuation module is 0～60dB;
4. digitalized ultrasonic receiving conditioning circuit according to claim 1 is characterized in that: in voltage-controlled amplification module, voltage-controlled amplifier AD603 is designed to the mode of operation of 0～40dB; In two voltage-controlled signals that AD603 needs, voltage-controlled signal provides the DC voltage of 2.5V by reference voltage chip LM336_2.5, and another voltage-controlled signal is provided by the outside, i.e. VC1; The gain of AD603 changes according to fixing mathematical relation according to VC1, and VC1 is a program-controlled signal, thereby realizes the automatic control of the entire gain of the digitalized ultrasonic receiving conditioning circuit that the present invention proposes by VC1;
5. digitalized ultrasonic receiving conditioning circuit according to claim 1 is characterized in that: in anti-phase amplification module, signal is by the end of oppisite phase 6 pin input of AD8032, and typical anti-phase scale operation amplifying circuit is formed in the output of 7 pin; The resistance of resistance R C5, RC2 is respectively 200 Ω, 2400 Ω, so the gain of this anti-phase amplification module is 12 times;
6. digitalized ultrasonic receiving conditioning circuit according to claim 1, it is characterized in that: in noise suppression module, resistance R T1 and potentiometer WT1 are formed the resistance in series bleeder circuit, when regulating the slide head of WT1, the magnitude of voltage of in-phase end in the time of can changing diode DD1 conducting; Noise figure in the ifs circuit is bigger, and the magnitude of voltage of in-phase end increased when the slide head of adjusting WT1 made the DD1 conducting, suppressed noise; Noise figure in the ifs circuit is little, and the magnitude of voltage of in-phase end reduced when the slide head of adjusting WT1 made the DD1 conducting, kept echoed signal;
7. digitalized ultrasonic receiving conditioning circuit according to claim 1 is characterized in that: in the homophase amplification module, signal is by the in-phase end 3 pin input of AD844, and typical in-phase proportion operational amplifier is formed in the output of 6 pin; The resistance of resistance R D3, RD1 is respectively 100 Ω, 470 Ω, so the gain of this homophase amplification module is 5.7 times;
8. digitalized ultrasonic receiving conditioning circuit according to claim 1, it is characterized in that: in the monostable trigger module, RC filtering circuit with resistance R M1, potentiometer ZMQ1 and capacitor C M1 composition, insert time control 1,2 pin of two-way monostalbe trigger HEF4538, external trigger control signal CF is inserted the triggering of HEF4538 and control 5 pin, realize that first via monostable triggers; RC filtering circuit with resistance R M2, potentiometer ZMK1 and capacitor C M2 composition, insert time control 14,15 pin of two-way monostalbe trigger HEF4538, the monostable triggering of the first via is exported the triggering of 6 pin access HEF4538 and control 11 pin, realize that the second tunnel monostable triggers; With output 9 pin that the second tunnel monostable triggers, the duty of control triode Q3; Wherein, by regulating the slide head of ZMQ1, ZMK1, can change the time that first via monostable triggers, the second tunnel monostable triggers respectively;
9. digitalized ultrasonic receiving conditioning circuit according to claim 1 is characterized in that: once in door position, the gate-width control module, when triode Q3 conducting, echoed signal forbids being transferred to Q2 from Q1 at echo; When triode Q3 ended, echoed signal allowed to be transferred to Q2 from Q1; Q3 conducting or the output control that triggers by the second tunnel monostable by HEF4538, the slide head of adjusting ZMQ1, ZMK1 can change echoed signal once door position, gate-width control respectively; By echoed signal once door position, gate-width control both can thoroughly suppress to seal in transmitting in the echoed signal, can be convenient to echo secondary door position, gate-width control again and observe; Wherein after detection system was determined, echo once door position, gate-width control did not need to regulate again;
10. digitalized ultrasonic receiving conditioning circuit according to claim 1 is characterized in that: in echo secondary door position, gate-width control module, when triode Q4 conducting, echoed signal forbids that being transferred to the peak from Q2 protects chip; When triode Q4 ended, echoed signal allowed to be transferred to the peak from Q2 and protects chip; Q4 conducting or the gate-control signal MK that ends by the outside input control, thereby realize secondary door position, the gate-width control of echoed signal; MK belongs to a program control signal, thereby by the door position of echoed signal in the digitalized ultrasonic receiving conditioning circuit of its realization the present invention proposition, the automatic control of gate-width;
11. digitalized ultrasonic receiving conditioning circuit according to claim 1, it is characterized in that: protect in the module at the peak, 1, the 14 pin short circuits of chip PDK01 are protected at the peak, the duty of the input signal RST-PDK01 control PDK01 by the outside, i.e. sampling still keeps; Export the final output of the digitalized ultrasonic receiving conditioning circuit that i.e. the present invention proposes behind the voltage stabilizing diode DZ1 amplitude limit of 3 pin of PDK01 (output is protected at the peak) by 4.7V.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110635815A (en) * | 2019-09-09 | 2019-12-31 | 云南康木信科技有限责任公司 | Circuit for automatic attenuation control of front-stage radio frequency input end of medium-short wave receiver |
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| JPS5663332A (en) * | 1979-10-25 | 1981-05-29 | Radionics Ltd | Measuring device for axial length of eye |
| CN1045865A (en) * | 1990-04-29 | 1990-10-03 | 左传庆 | Range finder for car rear obstacle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110635815A (en) * | 2019-09-09 | 2019-12-31 | 云南康木信科技有限责任公司 | Circuit for automatic attenuation control of front-stage radio frequency input end of medium-short wave receiver |
| CN110635815B (en) * | 2019-09-09 | 2021-07-30 | 云南康木信科技有限责任公司 | Circuit for automatic attenuation control of front-stage radio frequency input end of medium-short wave receiver |
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