CN104808144A - Motor test system based on compound type oscillating circuit - Google Patents
Motor test system based on compound type oscillating circuit Download PDFInfo
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- CN104808144A CN104808144A CN201510224576.0A CN201510224576A CN104808144A CN 104808144 A CN104808144 A CN 104808144A CN 201510224576 A CN201510224576 A CN 201510224576A CN 104808144 A CN104808144 A CN 104808144A
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Abstract
The invention discloses a motor test system based on a compound type oscillating circuit. The motor test system comprises a single chip microcomputer (1), a power module (2), a motor rotation speed control module (3), a triode triggering circuit (8), a displayer (7), a rotation speed signal processing module (5), a to-be-tested motor (4) and a speed sensor (6). The power module (2) is connected with the single chip microcomputer (1), the rotation speed signal processing module (5) is connected with the triode triggering circuit (8), the to-be-tested motor (4) is connected with the motor rotation speed control module (3), and the speed sensor (6) is connected with the to-be-tested motor (4). The motor rotation speed control module (3) is connected with the power module (2). The motor test system is characterized in that the compound type oscillating circuit (9) is arranged between the rotation speed signal processing module (5) and the speed sensor (6). The motor test system has the advantages that rotation speed signals are more stable through the compound type oscillating circuit, and rotation speed test accuracy is further improved.
Description
Technical field
The present invention relates to a kind of Motor Measuring System, specifically refer to a kind of Motor Measuring System based on compound oscillatory circuit.
Background technology
Along with national economy and scientific and technical development, the effect that motor plays in all trades and professions is more and more important.Meanwhile, along with the development of every profession and trade, more and more higher requirement is proposed to motor product, so motor product needs to verify whether its characteristic reaches application requirement by some pilot projects.Therefore, Motor Measuring Technology has considerable meaning for the performance verification of motor.
But the stability of traditional Motor Measuring System when testing of electric motors rotating speed is not high, have impact on the assessment of tester to motor performance to a great extent.Therefore, a kind of stable Motor Measuring System is provided to be then the current task of top priority.
Summary of the invention
The object of the invention is to overcome the low defect of its stability of traditional Motor Measuring System, a kind of Motor Measuring System based on compound oscillatory circuit is provided.
Object of the present invention is achieved through the following technical solutions: a kind of Motor Measuring System based on compound oscillatory circuit, by single-chip microcomputer, the power module be connected with single-chip microcomputer, motor speed control module, triode trigger circuit, display, the tach signal processing module be connected with triode trigger circuit, be connected with motor speed control module by measured motor, the speed pickup be connected with by measured motor, described motor speed control module is also connected with power module.In order to realize object of the present invention, the present invention is also provided with compound oscillatory circuit between tach signal processing module and speed pickup.
Further, described compound oscillatory circuit is by transformer T1, triode VT8, triode VT9, P pole is connected with the emitter of triode VT8, N pole then in turn after resistance R17 and resistance R16 as the diode D6 of circuit one output stage, one end is connected with the base stage of triode VT8 after oscillator X, the resistance R18 of other end ground connection, minus earth, the polar capacitor C10 that positive pole is then connected with the tie point of resistance R17 with resistance R16 after polar capacitor C9, and P pole ground connection, the diode D7 that N pole is then connected with the N pole of diode D6 after polar capacitor C11 forms, the collector of described triode VT9 is connected with the collector of triode VT8, its grounded emitter, base stage are then connected with the tie point of oscillator X with resistance R18, the described Same Name of Ends on the former limit of transformer T1 is connected with the N pole of diode D6, its non-same polarity is then connected with the N pole of diode D7 and the positive pole of polar capacitor C10 respectively, the Same Name of Ends of transformer T1 secondary together with its non-same polarity as the output terminal of circuit.
Described triode trigger circuit are by triode VT5, pole pipe VT6, triode VT7, one end is connected with the base stage of triode VT5, the other end then inputs the resistance R11 of pole as circuit one, one end is connected with the emitter of triode VT5, the other end is then as the resistance R10 of circuit one output stage, P pole is connected with the base stage of triode VT6, the diode D5 that N pole is then connected with the collector of triode VT5, positive pole is connected with the base stage of triode VT7, negative pole is then as the polar capacitor C8 of another input pole of circuit, the resistance R12 be in parallel with polar capacitor C8, and one end is connected with the emitter of triode VT7, the resistance R13 that the other end is then connected with the collector of triode VT7 after resistance R15 through resistance R14 in turn forms, the base stage of described triode VT7 is connected with the tie point of resistance R14 with resistance R13, its collector is then connected with the collector of triode VT5, the emitter of described triode VT6 is connected with the collector of triode VT7, its grounded collector, the tie point ground connection of described resistance R14 and resistance R15.
Described tach signal processing module by signal screening circuit, the signal processing circuit be connected with signal screening circuit, and the transformation output circuit be connected with signal processing circuit forms.
Described signal screening circuit is by companion chip U, triode VT1, triode VT2, Sheffer stroke gate A1, Sheffer stroke gate A2, negative pole is connected with the VIN pin of companion chip U, the polar capacitor C1 that positive pole is then connected with the emitter of triode VT1 after resistance R1, positive pole is connected with the LX pin of companion chip U, the polar capacitor C2 that negative pole is then connected with the collector of triode VT2, positive terminal is connected with the PGND pin of companion chip U, the polarity-inverting amplifier D1 that end of oppisite phase is then connected with the negative pole of Sheffer stroke gate A2, negative pole is connected with the negative pole of Sheffer stroke gate A1, the polar capacitor C3 that positive pole is then connected with the emitter of triode VT2 after resistance R2, and minus earth, the polar capacitor C4 that positive pole is then connected with the positive pole of Sheffer stroke gate A2 after resistance R3 forms, the LX pin of described companion chip U is connected with the collector of triode VT1, its OUT pin is then connected with the negative pole of Sheffer stroke gate A2, GND pin ground connection, the output terminal of described Sheffer stroke gate A2 is connected with signal processing circuit, its positive pole is then connected with the output terminal of Sheffer stroke gate A1 and signal processing circuit respectively, and the positive pole of described Sheffer stroke gate A1 is connected with the collector of triode VT2, its negative pole is then connected with signal processing circuit, the positive pole of described polar capacitor C4 is also connected with signal processing circuit.
Described signal processing circuit is by process chip U1, field effect transistor Q1, field effect transistor Q2, triode VT3, P pole is connected with the positive pole of Sheffer stroke gate A2, the diode D2 that N pole is then connected with the BOOT pin of process chip U1, positive pole is connected with the GND pin of process chip U1, the polar capacitor C5 that negative pole is then connected with the FB pin of process chip U1, positive pole is connected with the drain electrode of field effect transistor Q1, the polar capacitor C7 of minus earth, one end is connected with the PHASE pin of process chip U1, the inductance L 1 that the other end is then connected with the emitter of triode VT3, one end is connected with the OCSET pin of process chip U1, the resistance R4 that the other end is then connected with the source electrode of field effect transistor Q1, one end is connected with the LGATE pin of process chip U1, the resistance R5 that the other end is then connected with the base stage of triode VT3, and negative pole is connected with the LGAET pin of process chip U1, the polar capacitor C6 that positive pole is then connected with the collector of triode VT3 after resistance R6 forms, the VCC pin of described process chip U1 is connected with the positive pole of polar capacitor C4, its FB pin is then connected with the negative pole of Sheffer stroke gate A1, GND pin ground connection, LGATE pin are connected with the grid of field effect transistor Q2, UGATE pin is then connected with the grid of field effect transistor Q1, the drain electrode of described field effect transistor Q1 is respectively with the output terminal of Sheffer stroke gate A2 and transformation output circuit is connected, its source electrode is then connected with the drain electrode of field effect transistor Q2, the source ground of described field effect transistor Q2, the emitter of triode VT3 is then connected with transformation output circuit.
Described transformation output circuit is by transformer T, triode VT4, field effect transistor Q3, N pole is connected with transformer T former limit non-same polarity, the diode D3 of P pole ground connection, the diode D4 that P pole is connected with transformer T secondary non-same polarity, N pole is then connected with the grid of field effect transistor Q3 after resistance R8, the resistance R9 that one end is connected with transformer T secondary Same Name of Ends, the other end is then connected with the grid of field effect transistor Q3, and the resistance R7 that one end is connected with transformer T secondary Same Name of Ends, the other end is then connected with the base stage of triode VT4 forms; Described transformer T former limit Same Name of Ends is connected with the drain electrode of field effect transistor Q1, its non-same polarity is then connected with the emitter of triode VT3, and the grid of described field effect transistor Q3 is connected with the collector of triode VT4, its source electrode is then connected with the emitter of triode VT4 and transformer T secondary Same Name of Ends respectively.
Described companion chip U is MAX1921 integrated circuit, and process chip U1 is APW7120 integrated circuit.
The present invention comparatively prior art compares, and has the following advantages and beneficial effect:
(1) structure of the present invention is simple, and easy to operate, system cost is cheap.
(2) the present invention can test motor speed accurately, and tester can better judge motor performance.
(3) the present invention adopts APW7120 integrated chip as process chip, more energy-conservation.
(4) the present invention can make tach signal more stable by the effect of compound oscillatory circuit, further increases measurement of rotating speed precision of the present invention.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present invention;
Fig. 2 is tach signal processing module electrical block diagram of the present invention;
Fig. 3 is triode trigger circuit structure schematic diagram of the present invention;
Fig. 4 is compound oscillatory circuit structural representation of the present invention.
Reference numeral name in above accompanying drawing is called:
1-single-chip microcomputer, 2-power module, 3-motor speed control module, 4-by measured motor, 5-tach signal processing module, 6-speed pickup, 7-display, 8-triode trigger circuit, 9-compound oscillatory circuit, 51-signal screening circuit, 52-signal processing circuit, 53-transformation output circuit.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment
As shown in Figure 1, the present invention is by single-chip microcomputer 1, the power module 2 be connected with single-chip microcomputer 1, motor speed control module 3, display 7, triode trigger circuit 8, the tach signal processing module 5 be connected with triode trigger circuit 8, be connected with motor speed control module 3 by measured motor 4, the speed pickup 6 be connected with by measured motor 4, described motor speed control module 3 is also connected with power module 2.In order to reach object of the present invention, the present invention is also provided with compound oscillatory circuit 9 between tach signal processing module 5 and speed pickup 6.
Wherein, single-chip microcomputer 1 is as control center of the present invention, and power module 2 is for providing power supply to Motor Measuring System.Motor speed control module 3 is for controlling by the rotating speed of measured motor 4, namely after tester inputs motor speed value in single-chip microcomputer 1, signal is sent to motor speed control module 3, by motor speed control module 3 the rotating speed set by the adjustment of rotational speed of measured motor 4 to tester by single-chip microcomputer 1.Speed pickup 6 is for gathering by the real-time rotate speed signal of measured motor 4, and tach signal processing module 5 is then for processing tach signal.Triode trigger circuit 8 are for doing further process to tach signal.Display 7 is for showing intuitively by the tachometer value of measured motor 4.Compound oscillatory circuit 9 is as inventive point of the present invention, and it is for triggering tach signal processing module 5, tach signal process is obtained sooner, more stable.
Better effect is reached in order to enable the present invention, the MEMS type magnetic resistance speed sensor of the BNP-16 series that this speed pickup 6 adopts great Gong An road, Dalian instrument and meter for automation company to produce, this speed probe has extremely low velocity deviation, and the impact do not shaken.Motor speed control module 3, power module 2, display 7, single-chip microcomputer 1 all adopt existing technology to realize.
As shown in Figure 2, this tach signal processing module 5 by the signal screening circuit 51 screened tach signal, the signal processing circuit 52 be connected with signal screening circuit 51, and the transformation output circuit 53 be connected with signal processing circuit 52 forms.
Wherein, signal screening circuit 51 is by companion chip U, triode VT1, triode VT2, Sheffer stroke gate A1, Sheffer stroke gate A2, negative pole is connected with the VIN pin of companion chip U, the polar capacitor C1 that positive pole is then connected with the emitter of triode VT1 after resistance R1, positive pole is connected with the LX pin of companion chip U, the polar capacitor C2 that negative pole is then connected with the collector of triode VT2, positive terminal is connected with the PGND pin of companion chip U, the polarity-inverting amplifier D1 that end of oppisite phase is then connected with the negative pole of Sheffer stroke gate A2, negative pole is connected with the negative pole of Sheffer stroke gate A1, the polar capacitor C3 that positive pole is then connected with the emitter of triode VT2 after resistance R2, and minus earth, the polar capacitor C4 that positive pole is then connected with the positive pole of Sheffer stroke gate A2 after resistance R3 forms.The LX pin of described companion chip U is connected with the collector of triode VT1, its OUT pin is then connected with the negative pole of Sheffer stroke gate A2, GND pin ground connection, the output terminal of described Sheffer stroke gate A2 is connected with signal processing circuit 52, its positive pole is then connected with the output terminal of Sheffer stroke gate A1 and signal processing circuit 52 respectively, and the positive pole of described Sheffer stroke gate A1 is connected with the collector of triode VT2, its negative pole is then connected with signal processing circuit 52.The positive pole of described polar capacitor C4 is also connected with signal processing circuit 52.In order to better implement the present invention, this companion chip U preferentially adopts MAX1921 integrated circuit to realize.
Described signal processing circuit 52 is by process chip U1, field effect transistor Q1, field effect transistor Q2, triode VT3, P pole is connected with the positive pole of Sheffer stroke gate A2, the diode D2 that N pole is then connected with the BOOT pin of process chip U1, positive pole is connected with the GND pin of process chip U1, the polar capacitor C5 that negative pole is then connected with the FB pin of process chip U1, positive pole is connected with the drain electrode of field effect transistor Q1, the polar capacitor C7 of minus earth, one end is connected with the PHASE pin of process chip U1, the inductance L 1 that the other end is then connected with the emitter of triode VT3, one end is connected with the OCSET pin of process chip U1, the resistance R4 that the other end is then connected with the source electrode of field effect transistor Q1, one end is connected with the LGATE pin of process chip U1, the resistance R5 that the other end is then connected with the base stage of triode VT3, and negative pole is connected with the LGAET pin of process chip U1, the polar capacitor C6 that positive pole is then connected with the collector of triode VT3 after resistance R6 forms.The VCC pin of described process chip U1 is connected with the positive pole of polar capacitor C4, its FB pin is then connected with the negative pole of Sheffer stroke gate A1, GND pin ground connection, LGATE pin are connected with the grid of field effect transistor Q2, UGATE pin is then connected with the grid of field effect transistor Q1; The drain electrode of described field effect transistor Q1 is respectively with the output terminal of Sheffer stroke gate A2 and transformation output circuit 53 is connected, its source electrode is then connected with the drain electrode of field effect transistor Q2.The source ground of described field effect transistor Q2; The emitter of triode VT3 is then connected with transformation output circuit 53.In order to better implement the present invention, described process chip U1 is preferably APW7120 integrated circuit to realize.
Described transformation output circuit 53 is by transformer T, triode VT4, field effect transistor Q3, N pole is connected with transformer T former limit non-same polarity, the diode D3 of P pole ground connection, the diode D4 that P pole is connected with transformer T secondary non-same polarity, N pole is then connected with the grid of field effect transistor Q3 after resistance R8, the resistance R9 that one end is connected with transformer T secondary Same Name of Ends, the other end is then connected with the grid of field effect transistor Q3, and the resistance R7 that one end is connected with transformer T secondary Same Name of Ends, the other end is then connected with the base stage of triode VT4 forms.Described transformer T former limit Same Name of Ends is connected with the drain electrode of field effect transistor Q1, its non-same polarity is then connected with the emitter of triode VT3, and the grid of described field effect transistor Q3 is connected with the collector of triode VT4, its source electrode is then connected with the emitter of triode VT4 and transformer T secondary Same Name of Ends respectively.
As shown in Figure 3, triode trigger circuit 8 are by triode VT5, pole pipe VT6, triode VT7, one end is connected with the base stage of triode VT5, the other end then inputs the resistance R11 of pole as circuit one, one end is connected with the emitter of triode VT5, the other end is then as the resistance R10 of circuit one output stage, P pole is connected with the base stage of triode VT6, the diode D5 that N pole is then connected with the collector of triode VT5, positive pole is connected with the base stage of triode VT7, negative pole is then as the polar capacitor C8 of another input pole of circuit, the resistance R12 be in parallel with polar capacitor C8, and one end is connected with the emitter of triode VT7, the resistance R13 that the other end is then connected with the collector of triode VT7 after resistance R15 through resistance R14 in turn forms.The base stage of described triode VT7 is connected with the tie point of resistance R14 with resistance R13, its collector is then connected with the collector of triode VT5; The emitter of described triode VT6 is connected with the collector of triode VT7, its grounded collector; The tie point ground connection of described resistance R14 and resistance R15.In order to better implement the present invention, described triode VT5, triode VT6, triode VT7 preferentially adopts negative-positive-negative transistor to realize.
As shown in Figure 4, described compound oscillatory circuit 9 is by transformer T1, triode VT8, triode VT9, P pole is connected with the emitter of triode VT8, N pole then in turn after resistance R17 and resistance R16 as the diode D6 of circuit one output stage, one end is connected with the base stage of triode VT8 after oscillator X, the resistance R18 of other end ground connection, minus earth, the polar capacitor C10 that positive pole is then connected with the tie point of resistance R17 with resistance R16 after polar capacitor C9, and P pole ground connection, the diode D7 that N pole is then connected with the N pole of diode D6 after polar capacitor C11 forms.The collector of described triode VT9 is connected with the collector of triode VT8, its grounded emitter, base stage are then connected with the tie point of oscillator X with resistance R18; The described Same Name of Ends on the former limit of transformer T1 is connected with the N pole of diode D6, its non-same polarity is then connected with the N pole of diode D7 and the positive pole of polar capacitor C10 respectively, the Same Name of Ends of transformer T1 secondary together with its non-same polarity as the output terminal of circuit.
As mentioned above, just well the present invention can be realized.
Claims (8)
1. the Motor Measuring System based on compound oscillatory circuit, by single-chip microcomputer (1), the power module (2) be connected with single-chip microcomputer (1), motor speed control module (3), triode trigger circuit (8), display (7), the tach signal processing module (5) be connected with triode trigger circuit (8), be connected with motor speed control module (3) by measured motor (4), the speed pickup (6) be connected with by measured motor (4) forms, described motor speed control module (3) is also connected with power module (2), it is characterized in that, compound oscillatory circuit (9) is also provided with between tach signal processing module (5) and speed pickup (6), described compound oscillatory circuit (9) is by transformer T1, triode VT8, triode VT9, P pole is connected with the emitter of triode VT8, N pole then in turn after resistance R17 and resistance R16 as the diode D6 of circuit one output stage, one end is connected with the base stage of triode VT8 after oscillator X, the resistance R18 of other end ground connection, minus earth, the polar capacitor C10 that positive pole is then connected with the tie point of resistance R17 with resistance R16 after polar capacitor C9, and P pole ground connection, the diode D7 that N pole is then connected with the N pole of diode D6 after polar capacitor C11 forms, the collector of described triode VT9 is connected with the collector of triode VT8, its grounded emitter, base stage are then connected with the tie point of oscillator X with resistance R18, the described Same Name of Ends on the former limit of transformer T1 is connected with the N pole of diode D6, its non-same polarity is then connected with the N pole of diode D7 and the positive pole of polar capacitor C10 respectively, the Same Name of Ends of transformer T1 secondary together with its non-same polarity as the output terminal of circuit.
2. a kind of Motor Measuring System based on compound oscillatory circuit according to claim 1, it is characterized in that: described triode trigger circuit (8) are by triode VT5, pole pipe VT6, triode VT7, one end is connected with the base stage of triode VT5, the other end then inputs the resistance R11 of pole as circuit one, one end is connected with the emitter of triode VT5, the other end is then as the resistance R10 of circuit one output stage, P pole is connected with the base stage of triode VT6, the diode D5 that N pole is then connected with the collector of triode VT5, positive pole is connected with the base stage of triode VT7, negative pole is then as the polar capacitor C8 of another input pole of circuit, the resistance R12 be in parallel with polar capacitor C8, and one end is connected with the emitter of triode VT7, the resistance R13 that the other end is then connected with the collector of triode VT7 after resistance R15 through resistance R14 in turn forms, the base stage of described triode VT7 is connected with the tie point of resistance R14 with resistance R13, its collector is then connected with the collector of triode VT5, the emitter of described triode VT6 is connected with the collector of triode VT7, its grounded collector, the tie point ground connection of described resistance R14 and resistance R15.
3. a kind of Motor Measuring System based on compound oscillatory circuit according to claim 2, it is characterized in that: described tach signal processing module (5) is by signal screening circuit (51), the signal processing circuit (52) be connected with signal screening circuit (51), and the transformation output circuit (53) be connected with signal processing circuit (52) forms.
4. a kind of Motor Measuring System based on compound oscillatory circuit according to claim 3, it is characterized in that: described signal screening circuit (51) is by companion chip U, triode VT1, triode VT2, Sheffer stroke gate A1, Sheffer stroke gate A2, negative pole is connected with the VIN pin of companion chip U, the polar capacitor C1 that positive pole is then connected with the emitter of triode VT1 after resistance R1, positive pole is connected with the LX pin of companion chip U, the polar capacitor C2 that negative pole is then connected with the collector of triode VT2, positive terminal is connected with the PGND pin of companion chip U, the polarity-inverting amplifier D1 that end of oppisite phase is then connected with the negative pole of Sheffer stroke gate A2, negative pole is connected with the negative pole of Sheffer stroke gate A1, the polar capacitor C3 that positive pole is then connected with the emitter of triode VT2 after resistance R2, and minus earth, the polar capacitor C4 that positive pole is then connected with the positive pole of Sheffer stroke gate A2 after resistance R3 forms, the LX pin of described companion chip U is connected with the collector of triode VT1, its OUT pin is then connected with the negative pole of Sheffer stroke gate A2, GND pin ground connection, the output terminal of described Sheffer stroke gate A2 is connected with signal processing circuit (52), its positive pole is then connected with the output terminal of Sheffer stroke gate A1 and signal processing circuit (52) respectively, and the positive pole of described Sheffer stroke gate A1 is connected with the collector of triode VT2, its negative pole is then connected with signal processing circuit (52), the positive pole of described polar capacitor C4 is also connected with signal processing circuit (52).
5. a kind of Motor Measuring System based on compound oscillatory circuit according to claim 4, it is characterized in that: described signal processing circuit (52) is by process chip U1, field effect transistor Q1, field effect transistor Q2, triode VT3, P pole is connected with the positive pole of Sheffer stroke gate A2, the diode D2 that N pole is then connected with the BOOT pin of process chip U1, positive pole is connected with the GND pin of process chip U1, the polar capacitor C5 that negative pole is then connected with the FB pin of process chip U1, positive pole is connected with the drain electrode of field effect transistor Q1, the polar capacitor C7 of minus earth, one end is connected with the PHASE pin of process chip U1, the inductance L 1 that the other end is then connected with the emitter of triode VT3, one end is connected with the OCSET pin of process chip U1, the resistance R4 that the other end is then connected with the source electrode of field effect transistor Q1, one end is connected with the LGATE pin of process chip U1, the resistance R5 that the other end is then connected with the base stage of triode VT3, and negative pole is connected with the LGAET pin of process chip U1, the polar capacitor C6 that positive pole is then connected with the collector of triode VT3 after resistance R6 forms, the VCC pin of described process chip U1 is connected with the positive pole of polar capacitor C4, its FB pin is then connected with the negative pole of Sheffer stroke gate A1, GND pin ground connection, LGATE pin are connected with the grid of field effect transistor Q2, UGATE pin is then connected with the grid of field effect transistor Q1, the drain electrode of described field effect transistor Q1 is respectively with the output terminal of Sheffer stroke gate A2 and transformation output circuit (53) is connected, its source electrode is then connected with the drain electrode of field effect transistor Q2, the source ground of described field effect transistor Q2, the emitter of triode VT3 is then connected with transformation output circuit (53).
6. a kind of Motor Measuring System based on compound oscillatory circuit according to claim 5, it is characterized in that: described transformation output circuit (53) is by transformer T, triode VT4, field effect transistor Q3, N pole is connected with transformer T former limit non-same polarity, the diode D3 of P pole ground connection, P pole is connected with transformer T secondary non-same polarity, the diode D4 that N pole is then connected with the grid of field effect transistor Q3 after resistance R8, one end is connected with transformer T secondary Same Name of Ends, the resistance R9 that the other end is then connected with the grid of field effect transistor Q3, and one end is connected with transformer T secondary Same Name of Ends, the resistance R7 that the other end is then connected with the base stage of triode VT4 forms, described transformer T former limit Same Name of Ends is connected with the drain electrode of field effect transistor Q1, its non-same polarity is then connected with the emitter of triode VT3, and the grid of described field effect transistor Q3 is connected with the collector of triode VT4, its source electrode is then connected with the emitter of triode VT4 and transformer T secondary Same Name of Ends respectively.
7. a kind of Motor Measuring System based on compound oscillatory circuit according to claim 6, is characterized in that: described companion chip U is MAX1921 integrated circuit.
8. a kind of Motor Measuring System based on compound oscillatory circuit according to claim 6, is characterized in that: described process chip U1 is APW7120 integrated circuit.
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Application publication date: 20150729 |