CN104931172A - Current vortex power measuring system based on constant current source circuit - Google Patents
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- CN104931172A CN104931172A CN201510249638.3A CN201510249638A CN104931172A CN 104931172 A CN104931172 A CN 104931172A CN 201510249638 A CN201510249638 A CN 201510249638A CN 104931172 A CN104931172 A CN 104931172A
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Abstract
The invention discloses a current vortex power measuring system based on a constant current source circuit; the system comprises a one-chip microcomputer (4), a signal processing module (3) connected with the one-chip microcomputer (4), a motor control module (5), a display (6), an operation module (7), and a to be tested motor (1) connected with the motor control module (5), and a current vortex power measuring machine (2) connected with the to be tested motor (1). The features are that the constant current source circuit (8) is also arranged between the current vortex power measuring machine (2) and the signal processing module (3). The current vortex power measuring system has constant current so as to prevent current fluctuation from affecting power test.
Description
Technical field
The present invention relates to a kind of eddy current dynamometric system, specifically refer to a kind of eddy current dynamometric system based on constant-current source circuit.
Background technology
Electric eddy current dynamometer is the loading measurement of power equipment of current domestic advanced person, especially load in dynamometer test at the power machine of middle low power and micropower, the low speed of each power machine and High speed load dynamometer test aspect, relatively other type measurement of power loading equipemtn, in performance, price, reliability, safeguards there is obvious advantage in complexity etc.Especially in the loading measurement of power of low-speed machinery and micropower machinery, then other method is unrivaled especially.Therefore, replaced powder clutch, hydraulic dynamometer, DC generation unit etc. at a lot of occasion electric eddy current dynamometer, be used for measuring the performance of the power machines such as various motor, gasoline engine, diesel engine, gear case, become the necessaries of type approval test.But current used eddy current dynamometric system there will be the situation of electric current instability in the course of the work unavoidably, thus the output power of the equipment that detects causing power-measuring system stable.
Summary of the invention
The object of the invention is to overcome the defect that traditional eddy current dynamometric system operationally there will be electric current instability, a kind of eddy current dynamometric system based on constant-current source circuit is provided.
Object of the present invention is achieved through the following technical solutions: a kind of eddy current dynamometric system based on constant-current source circuit, by single-chip microcomputer, the signal processing module be connected with single-chip microcomputer, motor control module, display, operational module, what be connected with motor control module treats measured motor, with treat the electric eddy current dynamometer that measured motor is connected, between electric eddy current dynamometer and signal processing module, be also provided with constant-current source circuit.
Further, described constant-current source circuit is by constant current chip U1, amplifier P1, amplifier P2, field effect transistor Q1, negative pole is connected with the VIN pin of constant current chip U1, positive pole is then as the polar capacitor C8 of an input pole of this constant-current source circuit, one end is connected with the EN pin of constant current chip U1, the other end then together with the positive pole of polar capacitor C8 as the resistance R12 of the input end of this constant-current source circuit, N pole is connected with the ADJ pin of constant current chip U1 after resistance R14, the diode D5 that P pole is then connected with 15V voltage after resistance R11, one end is connected with the ADJ pin of constant current chip U1, the resistance R13 that the other end is then connected with the output terminal of amplifier P1, N pole together with the negative pole of amplifier P1 as the output terminal of this constant-current source circuit, the diode D6 that P pole is then connected with the drain electrode of field effect transistor Q1 after resistance R16, and one end is connected with the P pole of diode D6, the resistance R15 that the other end is then connected with the positive pole of amplifier P1 forms, the VIN pin of described constant current chip U1 is all connected with the P pole of diode D5 with its EN pin, its GND pin ground connection, and VOUT pin is then connected with the P pole of diode D6, the output terminal of described amplifier P1 is connected with the P pole of diode D6, its negative pole is then connected with the drain electrode of field effect transistor Q1, the positive pole of described amplifier P2 is connected with the P pole of diode D6, negative pole is then connected with the source electrode of field effect transistor Q1, its output terminal is then connected with the grid of field effect transistor Q1, the source electrode of described field effect transistor Q1 is then connected with the P pole of diode D5.
Described signal processing module is by signal processing circuit, the Sheffer stroke gate control circuit be connected with signal processing circuit, the bistable trigger-action circuit be connected with Sheffer stroke gate control circuit, and form with the rear end transformation output circuit that bistable trigger-action circuit is connected with Sheffer stroke gate control circuit simultaneously.
Described signal processing circuit is by process chip U, the resistance R1 that one end is connected with-SIG the pin of process chip U, the other end is then connected with the BIAS pin of process chip U after resistance R3, one end is connected with-CAR the pin of process chip U, the resistance R2 of other end ground connection, and the resistance R4 that one end is connected with the GMIN pin of process chip U, the other end is then connected with the ADJ pin of process chip U after potentiometer R5 forms;-V the pin of described process chip U is respectively with the tie point of resistance R1 and resistance R3 and bistable trigger-action circuit is connected, its-OUT pin is all connected with Sheffer stroke gate control circuit with+OUT pin; + SIG the pin of described process chip U together with its-V pin as the input end of this signal processing circuit.
Described Sheffer stroke gate control circuit is by Sheffer stroke gate A1, Sheffer stroke gate A2, positive pole is connected with the output terminal of Sheffer stroke gate A1 after polar capacitor C4 through resistance R6 in turn, the polar capacitor C1 of its minus earth, N pole is connected with the tie point of polar capacitor C4 with resistance R6, the diode D1 of P pole ground connection, positive pole is connected with the N pole of diode D1 after resistance R7, the polar capacitor C2 of minus earth, one end is connected with-OUT the pin of process chip U, the resistance R8 that the other end is then connected with the positive pole of Sheffer stroke gate A1, one end is connected with+OUT the pin of process chip U, the resistance R9 that the other end is then connected with the negative pole of Sheffer stroke gate A1, negative pole is connected with the output terminal of Sheffer stroke gate A1, the polar capacitor C5 that positive pole is then connected with the negative pole of Sheffer stroke gate A2, be serially connected in the resistance R10 between the positive pole of Sheffer stroke gate A2 and output terminal, and form with the polar capacitor C7 that resistance R10 is in parallel,-OUT the pin of described process chip U is connected with the positive pole of polar capacitor C1, its+OUT pin is then connected with the positive pole of polar capacitor C2, the negative pole of described Sheffer stroke gate A1 is all connected with bistable trigger-action circuit with its output terminal, the negative pole of described Sheffer stroke gate A2 is connected with bistable trigger-action circuit, its output terminal is then connected with bistable trigger-action circuit and rear end transformation output circuit respectively.
Described bistable trigger-action circuit is by triode VT1, triode VT2, the polar capacitor C3 that positive pole is connected with the collector of triode VT1, negative pole is then connected with the base stage of triode VT2, the polar capacitor C6 that positive pole is connected with the base stage of triode VT1, negative pole is then connected with the emitter of triode VT2, and the diode D2 that N pole is connected with the collector of triode VT2, P pole is then connected with the emitter of triode VT1 forms; The described collector of triode VT1 is connected with the negative pole of Sheffer stroke gate A1, its emitter is then connected with-V the pin of process chip U, base stage is then connected with the negative pole of Sheffer stroke gate A2; The described base stage of triode VT2 is connected with the output terminal of Sheffer stroke gate A1, its emitter is then connected with the output terminal of Sheffer stroke gate A2, collector is then connected with rear end transformation output circuit.
Described rear end transformation output circuit is by transformer T, and triode VT3, triode VT4, be arranged on telefault L1 and the telefault L2 on limit, transformer T source, be arranged on the telefault L3 of transformer T secondary, diode D3, and diode D4 forms; The N pole of described diode D3 is connected with the tap of telefault L1, P pole is then connected with the output terminal of Sheffer stroke gate A2, the P pole of diode D4 is connected with the non-same polarity of telefault L3, its N pole then together with the Same Name of Ends of telefault L3 as the output terminal of this rear end transformation output circuit; The described Same Name of Ends of telefault L1 is connected with the output terminal of Sheffer stroke gate A2, its non-same polarity is then connected with the base stage of triode VT4; The Same Name of Ends of described telefault L2 is connected with the collector of triode VT4, non-same polarity is then connected with the collector of triode VT3, its tap is then connected with the Same Name of Ends of telefault L1; The emitter of described triode VT3 is connected with the emitter of triode VT4, its base stage is then connected with the output terminal of Sheffer stroke gate A2 and the collector of triode VT2 respectively.
In order to reach better effect, described process chip U is preferably LM146 integrated circuit, and described constant current chip U1 is then preferably MIC29152 integrated circuit and realizes.
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 more saves energy consumption while guaranteeing measuring accuracy, reduces the cost in electromechanical testing process.
(3) the present invention has constant electric current, with the impact avoiding current fluctuation to cause power test.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present invention;
Fig. 2 is signal processing module electrical block diagram of the present invention;
Fig. 3 is constant-current source circuit structure schematic diagram of the present invention.
Reference numeral name in above accompanying drawing is called:
1-treat measured motor, 2-electric eddy current dynamometer, 3-signal processing module, 4-single-chip microcomputer, 5-motor control module, 6-display, 7-operational module, 8-constant-current source circuit, 31-signal processing circuit, 32-Sheffer stroke gate control circuit, 33-bistable trigger-action circuit, 34-rear end 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 4, the signal processing module 3 be connected with single-chip microcomputer 4, motor control module 5, display 6, operational module 7, what be connected with motor control module 5 treats measured motor 1, with the electric eddy current dynamometer 2 treating that measured motor 1 is connected, in order to reach object of the present invention, the present invention is also provided with constant-current source circuit 8 between electric eddy current dynamometer 2 and signal processing module 3.
Wherein, single-chip microcomputer 4 is as control center of the present invention.Electric eddy current dynamometer 2 is for detecting the torque signal for the treatment of measured motor and exporting.Signal processing module 3 processes for the torque signal exported electric eddy current dynamometer 2.Constant-current source circuit 8 can guarantee that the present invention has constant electric current.Single-chip microcomputer 4 can calculate by torque signal the realtime power treating measured motor 1, and is shown intuitively by display 6.Motor control module 5 controls for treating measured motor 1, and staff then can set by operational module 7 output power treating measured motor 1.
During work, start and treat measured motor 1, operator sets the output power treating measured motor 1 on operational module 7, and at this moment single-chip microcomputer 4 sends instruction to motor control module 5, makes it treat measured motor 1 according to the power set by operator and controls.The torque signal of measured motor 1 is treated in electric eddy current dynamometer 2 detections, and single-chip microcomputer 4 is calculated according to torque signal the realtime power for the treatment of measured motor 1 and shown by display 6.Operator can treating compared with the performance number that the realtime power of measured motor 1 and its are arranged in operational module 7, to judge the performance treating measured motor 1 thus.
In order to reach better effect, the DWD system electric eddy current dynamometer that this electric eddy current dynamometer 2 preferentially adopts Sichuan Cheng Bang observation and control technology company limited to produce realizes, and the electric eddy current dynamometer structure of this series is simple, convenient operating maintenance, braking moment is large, and measuring accuracy is high.And single-chip microcomputer 4, motor control module 5, operational module 7 and display 6 all adopt existing technology to realize.
As shown in Figure 2, signal processing module 3 is by signal processing circuit 31, the Sheffer stroke gate control circuit 32 be connected with signal processing circuit 31, the bistable trigger-action circuit 33 be connected with Sheffer stroke gate control circuit 32, and form with the rear end transformation output circuit 34 that bistable trigger-action circuit 33 is connected with Sheffer stroke gate control circuit 32 simultaneously.
Signal processing circuit 31 is wherein by process chip U, the resistance R1 that one end is connected with-SIG the pin of process chip U, the other end is then connected with the BIAS pin of process chip U after resistance R3, one end is connected with-CAR the pin of process chip U, the resistance R2 of other end ground connection, and the resistance R4 that one end is connected with the GMIN pin of process chip U, the other end is then connected with the ADJ pin of process chip U after potentiometer R5 forms.-V the pin of described process chip U is respectively with the tie point of resistance R1 and resistance R3 and bistable trigger-action circuit 33 is connected, its-OUT pin is all connected with Sheffer stroke gate control circuit 32 with+OUT pin.+ SIG the pin of described process chip U together with its-V pin as the input end of this signal processing circuit 31.In order to better implement the present invention, described process chip U preferentially adopts LM1496 integrated circuit to realize.
Described Sheffer stroke gate control circuit 32 is by Sheffer stroke gate A1, Sheffer stroke gate A2, positive pole is connected with the output terminal of Sheffer stroke gate A1 after polar capacitor C4 through resistance R6 in turn, the polar capacitor C1 of its minus earth, N pole is connected with the tie point of polar capacitor C4 with resistance R6, the diode D1 of P pole ground connection, positive pole is connected with the N pole of diode D1 after resistance R7, the polar capacitor C2 of minus earth, one end is connected with-OUT the pin of process chip U, the resistance R8 that the other end is then connected with the positive pole of Sheffer stroke gate A1, one end is connected with+OUT the pin of process chip U, the resistance R9 that the other end is then connected with the negative pole of Sheffer stroke gate A1, negative pole is connected with the output terminal of Sheffer stroke gate A1, the polar capacitor C5 that positive pole is then connected with the negative pole of Sheffer stroke gate A2, be serially connected in the resistance R10 between the positive pole of Sheffer stroke gate A2 and output terminal, and form with the polar capacitor C7 that resistance R10 is in parallel.-OUT the pin of described process chip U is connected with the positive pole of polar capacitor C1, its+OUT pin is then connected with the positive pole of polar capacitor C2; The negative pole of described Sheffer stroke gate A1 is all connected with bistable trigger-action circuit 33 with its output terminal.The negative pole of described Sheffer stroke gate A2 is connected with bistable trigger-action circuit 33, its output terminal is then connected with bistable trigger-action circuit 33 and rear end transformation output circuit 34 respectively.
Described bistable trigger-action circuit 33 is by triode VT1, triode VT2, the polar capacitor C3 that positive pole is connected with the collector of triode VT1, negative pole is then connected with the base stage of triode VT2, the polar capacitor C6 that positive pole is connected with the base stage of triode VT1, negative pole is then connected with the emitter of triode VT2, and the diode D2 that N pole is connected with the collector of triode VT2, P pole is then connected with the emitter of triode VT1 forms.The described collector of triode VT1 is connected with the negative pole of Sheffer stroke gate A1, its emitter is then connected with-V the pin of process chip U, base stage is then connected with the negative pole of Sheffer stroke gate A2.The described base stage of triode VT2 is connected with the output terminal of Sheffer stroke gate A1, its emitter is then connected with the output terminal of Sheffer stroke gate A2, collector is then connected with rear end transformation output circuit 34.
Described rear end transformation output circuit 34 is by transformer T, and triode VT3, triode VT4, be arranged on telefault L1 and the telefault L2 on limit, transformer T source, be arranged on the telefault L3 of transformer T secondary, diode D3, and diode D4 forms.During connection, the N pole of described diode D3 is connected with the tap of telefault L1, P pole is then connected with the output terminal of Sheffer stroke gate A2, the P pole of diode D4 is connected with the non-same polarity of telefault L3, its N pole then together with the Same Name of Ends of telefault L3 as the output terminal of this rear end transformation output circuit 34; The described Same Name of Ends of telefault L1 is connected with the output terminal of Sheffer stroke gate A2, its non-same polarity is then connected with the base stage of triode VT4; The Same Name of Ends of described telefault L2 is connected with the collector of triode VT4, non-same polarity is then connected with the collector of triode VT3, its tap is then connected with the Same Name of Ends of telefault L1; The emitter of described triode VT3 is connected with the emitter of triode VT4, its base stage is then connected with the output terminal of Sheffer stroke gate A2 and the collector of triode VT2 respectively.
Constant-current source circuit 8 is emphasis of the present invention, and as shown in Figure 3, it is by constant current chip U1, amplifier P1, amplifier P2, field effect transistor Q1, resistance R11, resistance R12, resistance R13, resistance R14, resistance R15, resistance R16, diode D6, diode D5, polar capacitor C8 form.During connection, the negative pole of polar capacitor C8 is connected with the VIN pin of constant current chip U1, its positive pole is then as an input pole of this constant-current source circuit 8, one end of resistance R12 is connected with the EN pin of constant current chip U1, its other end then together with the positive pole of polar capacitor C8 as the input end of this constant-current source circuit 8, the N pole of diode D5 is connected with the ADJ pin of constant current chip U1 after resistance R14, its P pole is then connected with 15V voltage after resistance R11, one end of resistance R13 is connected with the ADJ pin of constant current chip U1, its other end is then connected with the output terminal of amplifier P1, the N pole of diode D6 together with the negative pole of amplifier P1 as the output terminal of this constant-current source circuit 8, its P pole is then connected with the drain electrode of field effect transistor Q1 after resistance R16, one end of resistance R15 is connected with the P pole of diode D6, its other end is then connected with the positive pole of amplifier P1.The VIN pin of described constant current chip U1 is all connected with the P pole of diode D5 with its EN pin, and its GND pin ground connection, VOUT pin is then connected with the P pole of diode D6.The output terminal of described amplifier P1 is connected with the P pole of diode D6, its negative pole is then connected with the drain electrode of field effect transistor Q1.The positive pole of described amplifier P2 is connected with the P pole of diode D6, negative pole is then connected with the source electrode of field effect transistor Q1, its output terminal is then connected with the grid of field effect transistor Q1.The source electrode of described field effect transistor Q1 is then connected with the P pole of diode D5.In order to reach better implementation result, this constant current chip U1 preferentially adopts MIC29152 integrated circuit to realize.
As mentioned above, just well the present invention can be realized.
Claims (8)
1. the eddy current dynamometric system based on constant-current source circuit, by single-chip microcomputer (4), the signal processing module (3) be connected with single-chip microcomputer (4), motor control module (5), display (6), operational module (7), what be connected with motor control module (5) treats measured motor (1), and with treat that the electric eddy current dynamometer (2) that measured motor (1) is connected forms, it is characterized in that: between electric eddy current dynamometer (2) and signal processing module (3), be also provided with constant-current source circuit (8), described constant-current source circuit (8) is by constant current chip U1, amplifier P1, amplifier P2, field effect transistor Q1, negative pole is connected with the VIN pin of constant current chip U1, positive pole is then as the polar capacitor C8 of an input pole of this constant-current source circuit (8), one end is connected with the EN pin of constant current chip U1, the other end then together with the positive pole of polar capacitor C8 as the resistance R12 of the input end of this constant-current source circuit (8), N pole is connected with the ADJ pin of constant current chip U1 after resistance R14, the diode D5 that P pole is then connected with 15V voltage after resistance R11, one end is connected with the ADJ pin of constant current chip U1, the resistance R13 that the other end is then connected with the output terminal of amplifier P1, N pole together with the negative pole of amplifier P1 as the output terminal of this constant-current source circuit (8), the diode D6 that P pole is then connected with the drain electrode of field effect transistor Q1 after resistance R16, and one end is connected with the P pole of diode D6, the resistance R15 that the other end is then connected with the positive pole of amplifier P1 forms, the VIN pin of described constant current chip U1 is all connected with the P pole of diode D5 with its EN pin, its GND pin ground connection, and VOUT pin is then connected with the P pole of diode D6, the output terminal of described amplifier P1 is connected with the P pole of diode D6, its negative pole is then connected with the drain electrode of field effect transistor Q1, the positive pole of described amplifier P2 is connected with the P pole of diode D6, negative pole is then connected with the source electrode of field effect transistor Q1, its output terminal is then connected with the grid of field effect transistor Q1, the source electrode of described field effect transistor Q1 is then connected with the P pole of diode D5.
2. a kind of eddy current dynamometric system based on constant-current source circuit according to claim 1, it is characterized in that: described signal processing module (3) is by signal processing circuit (31), the Sheffer stroke gate control circuit (32) be connected with signal processing circuit (31), the bistable trigger-action circuit (33) be connected with Sheffer stroke gate control circuit (32), and form with rear end transformation output circuit (34) that bistable trigger-action circuit (33) is connected with Sheffer stroke gate control circuit (32) simultaneously.
3. a kind of eddy current dynamometric system based on constant-current source circuit according to claim 2, it is characterized in that: described signal processing circuit (31) is by process chip U, the resistance R1 that one end is connected with-SIG the pin of process chip U, the other end is then connected with the BIAS pin of process chip U after resistance R3, one end is connected with-CAR the pin of process chip U, the resistance R2 of other end ground connection, and the resistance R4 that one end is connected with the GMIN pin of process chip U, the other end is then connected with the ADJ pin of process chip U after potentiometer R5 forms;-V the pin of described process chip U is respectively with the tie point of resistance R1 and resistance R3 and bistable trigger-action circuit (33) is connected, its-OUT pin is all connected with Sheffer stroke gate control circuit (32) with+OUT pin; + SIG the pin of described process chip U together with its-V pin as the input end of this signal processing circuit (31).
4. a kind of eddy current dynamometric system based on constant-current source circuit according to claim 3, it is characterized in that: described Sheffer stroke gate control circuit (32) is by Sheffer stroke gate A1, Sheffer stroke gate A2, positive pole is connected with the output terminal of Sheffer stroke gate A1 after polar capacitor C4 through resistance R6 in turn, the polar capacitor C1 of its minus earth, N pole is connected with the tie point of polar capacitor C4 with resistance R6, the diode D1 of P pole ground connection, positive pole is connected with the N pole of diode D1 after resistance R7, the polar capacitor C2 of minus earth, one end is connected with-OUT the pin of process chip U, the resistance R8 that the other end is then connected with the positive pole of Sheffer stroke gate A1, one end is connected with+OUT the pin of process chip U, the resistance R9 that the other end is then connected with the negative pole of Sheffer stroke gate A1, negative pole is connected with the output terminal of Sheffer stroke gate A1, the polar capacitor C5 that positive pole is then connected with the negative pole of Sheffer stroke gate A2, be serially connected in the resistance R10 between the positive pole of Sheffer stroke gate A2 and output terminal, and form with the polar capacitor C7 that resistance R10 is in parallel,-OUT the pin of described process chip U is connected with the positive pole of polar capacitor C1, its+OUT pin is then connected with the positive pole of polar capacitor C2, the negative pole of described Sheffer stroke gate A1 is all connected with bistable trigger-action circuit (33) with its output terminal, the negative pole of described Sheffer stroke gate A2 is connected with bistable trigger-action circuit (33), its output terminal is then connected with bistable trigger-action circuit (33) and rear end transformation output circuit (34) respectively.
5. a kind of eddy current dynamometric system based on constant-current source circuit according to claim 4, it is characterized in that: described bistable trigger-action circuit (33) is by triode VT1, triode VT2, the polar capacitor C3 that positive pole is connected with the collector of triode VT1, negative pole is then connected with the base stage of triode VT2, the polar capacitor C6 that positive pole is connected with the base stage of triode VT1, negative pole is then connected with the emitter of triode VT2, and the diode D2 that N pole is connected with the collector of triode VT2, P pole is then connected with the emitter of triode VT1 forms; The described collector of triode VT1 is connected with the negative pole of Sheffer stroke gate A1, its emitter is then connected with-V the pin of process chip U, base stage is then connected with the negative pole of Sheffer stroke gate A2; The described base stage of triode VT2 is connected with the output terminal of Sheffer stroke gate A1, its emitter is then connected with the output terminal of Sheffer stroke gate A2, collector is then connected with rear end transformation output circuit (34).
6. a kind of eddy current dynamometric system based on constant-current source circuit according to claim 5, it is characterized in that: described rear end transformation output circuit (34) is by transformer T, triode VT3, triode VT4, be arranged on telefault L1 and the telefault L2 on limit, transformer T source, be arranged on the telefault L3 of transformer T secondary, diode D3, and diode D4 forms; The N pole of described diode D3 is connected with the tap of telefault L1, P pole is then connected with the output terminal of Sheffer stroke gate A2, the P pole of diode D4 is connected with the non-same polarity of telefault L3, its N pole then together with the Same Name of Ends of telefault L3 as the output terminal of this rear end transformation output circuit (34); The described Same Name of Ends of telefault L1 is connected with the output terminal of Sheffer stroke gate A2, its non-same polarity is then connected with the base stage of triode VT4; The Same Name of Ends of described telefault L2 is connected with the collector of triode VT4, non-same polarity is then connected with the collector of triode VT3, its tap is then connected with the Same Name of Ends of telefault L1; The emitter of described triode VT3 is connected with the emitter of triode VT4, its base stage is then connected with the output terminal of Sheffer stroke gate A2 and the collector of triode VT2 respectively.
7. a kind of eddy current dynamometric system based on constant-current source circuit according to claim 6, is characterized in that: described process chip U is LM146 integrated circuit.
8. a kind of eddy current dynamometric system based on constant-current source circuit according to any one of claim 1 ~ 6, is characterized in that: described constant current chip U1 is MIC29152 integrated circuit.
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| CN201510249638.3A CN104931172A (en) | 2015-05-17 | 2015-05-17 | Current vortex power measuring system based on constant current source circuit |
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| CN201510249638.3A CN104931172A (en) | 2015-05-17 | 2015-05-17 | Current vortex power measuring system based on constant current source circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105291858A (en) * | 2015-11-23 | 2016-02-03 | 成都科瑞信科技有限责任公司 | Novel eddy current retarder control system |
| CN105404210A (en) * | 2015-12-16 | 2016-03-16 | 成都飞凯瑞科技有限公司 | Smoke ventilator energy conservation control system based on constant-current source driving circuit |
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