CN215576342U

CN215576342U - Low-frequency function magnetic moment generating device

Info

Publication number: CN215576342U
Application number: CN202022565371.8U
Authority: CN
Inventors: 钱汉明; 孙平; 刘亚非; 郝文旭; 李益青
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-09
Filing date: 2020-11-09
Publication date: 2022-01-18
Anticipated expiration: 2030-11-09

Abstract

The utility model provides a low-frequency function magnetic moment generating device, comprising: a digital controller for receiving an external control signal and an output signal of the measuring sensor and outputting a pulse width modulation signal; the power amplifier receives the pulse width modulation signal output by the digital controller, linearly amplifies the pulse width modulation signal and outputs a power signal to the outside; the iron core solenoid assembly receives a power signal output by the power amplifier and generates a magnetic moment consistent with the change rule of an input signal; the measuring sensor circuit measures the current value in the iron core helical tube coil and inputs the measuring result into the digital controller, and the magnetic moment signal consistent with the function signal can be generated for the iron core solenoid assembly according to the function signal input by the digital controller, so that the function of any function magnetic moment generator is realized.

Description

Low-frequency function magnetic moment generating device

Technical Field

The utility model belongs to the field of magnetic moment generating devices, and particularly relates to a low-frequency function magnetic moment generating device.

Background

In many application scenarios, it is necessary to generate magnetic moments of variable frequency and amplitude in response to a control input signal to further generate a spatial magnetic field.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a low-frequency function magnetic moment generating device which can generate a magnetic moment consistent with a function signal input by a controller according to the function signal, thereby realizing the function of any function magnetic moment generator and being realized by the following technical scheme: the method comprises the following steps: a digital controller for receiving an external control signal and an output signal of the measuring sensor and outputting a pulse width modulation signal; the power amplifier receives the pulse width modulation signal output by the digital controller, linearly amplifies the pulse width modulation signal and outputs a power signal to the outside; the iron core solenoid assembly receives a power signal output by the power amplifier and generates a magnetic moment consistent with the change rule of an input signal; and a measurement sensor circuit that measures a current value in the core solenoidal coil and inputs the measurement result into the digital controller.

Preferably, the digital controller adopts a UC3637 dual PWM control chip to output two PWM signals, and controls the time length of magnetic moment generation by using the pulse width of the PWM signals.

Preferably, the power amplifier adopts an H-bridge circuit, and generates the current of the corresponding driving coil according to the instruction of a digital controller.

Preferably, the iron core spiral tube assembly is formed by winding a conducting wire on a magnetic rod.

Preferably, the measurement sensor circuit includes: the current acquisition chip, the current sensor and the differential amplifier are used for acquiring magnetic current signals of the iron core solenoid assembly and outputting voltage signals; the differential amplifier is used for amplifying the output voltage signal of the current sensor and transmitting the signal to the AD sampling circuit.

Preferably, the current collection chip is an ACS712 chip, which has a low-bias linear hall sensor circuit therein, and is capable of outputting a voltage proportional to the detected ac or dc current.

Preferably, the differential amplifier adopts AD8827, and the differential amplifier amplifies the front-end voltage and outputs a signal to the digital controller through the AD sampling circuit.

The utility model has the beneficial effects that: this patent application can produce the magnetic moment signal unanimous with it for iron core solenoid subassembly according to the function signal of digital control ware input to realize arbitrary function magnetic moment generator function.

Drawings

FIG. 1 is a system framework diagram of the present patent application;

FIG. 2 is a schematic diagram of a core solenoid assembly;

FIG. 3 is a circuit schematic of a power amplifier, employing a typical H-bridge circuit;

FIG. 4 is a pin diagram of a current collection chip;

FIG. 5 is a circuit schematic of a differential amplifier;

fig. 6 is a control schematic diagram of the application of PWM control of the present patent application.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Shown in fig. 1, comprising: a digital controller for receiving an external control signal and an output signal of the measuring sensor and outputting a pulse width modulation signal; the power amplifier receives the pulse width modulation signal output by the digital controller, linearly amplifies the pulse width modulation signal and outputs a power signal to the outside; the iron core solenoid assembly receives a power signal output by the power amplifier and generates a magnetic moment consistent with the change rule of an input signal; and a measurement sensor circuit that measures a current value in the core solenoidal coil and inputs the measurement result into the digital controller.

Preferably, the digital controller adopts UC3637 double-PWM control chip, is a pulse width modulation controller, can work with single power supply or double power supply, has double-path PWM output, has the characteristics of current-limiting protection, under-voltage blocking, temperature compensation and the like, and controls the time length of magnetic moment generation by utilizing the pulse width of PWM signals.

As shown in fig. 3, the power amplifier employs an H-bridge circuit to generate the corresponding current of the driving coil according to the instruction of the digital controller.

The iron core spiral tube component is formed by winding a wire coil on a magnetic rod, the number of winding turns of the wire coil is large, a multilayer coil mode is adopted, and three connection modes of series connection, parallel connection and series-parallel connection mixing shown in figure 2 can be adopted among the multilayer coils.

Preferably, the ACS712 chip shown in fig. 4 is used as the current collection chip, a low-bias linear hall sensor circuit is arranged in the current collection chip, the current collection chip can output a voltage proportional to a detected alternating current or direct current, and the current collection chip has the characteristics of low noise, fast response time (corresponding to a stepping input current, the output rise time is 5 μ s), 50kHz bandwidth, maximum total output error of 4%, high output sensitivity 185mV/a, convenience in use, high cost performance, high insulation voltage and the like.

Preferably, the differential amplifier is an AD8827 shown in fig. 5, and the differential amplifier amplifies the front-end voltage and outputs a signal to the digital controller through an AD sampling circuit.

Fig. 6 shows an application circuit of the present patent application, which is composed of four parts: the circuit comprises a main circuit, a pulse width signal generating circuit, a bootstrap drive circuit and a protection circuit.

The pulse width signal generating circuit generates corresponding PWM pulse waves based on a UC3637 double PWM control chip, 15v voltage is connected with a pin 1 and a pin 3 of the chip through a voltage dividing circuit, the pin 1 and the pin 3 respectively obtain 10v voltage and 5v voltage, and the voltage of a pin 2 connected with a capacitor CT changes within 5-10 v; the voltage signal obtained by the pin 9 is a voltage obtained by D/A conversion output by a computer, and controls the duty ratio of the output end of the UC 3637; in fig. 6, UC3637 outputs two complementary PWM pulse signals.

Because the 15V DC power supply contains certain AC noise, 1 capacitor C1 is connected in parallel in front of the pin 1, the pin 3 and the 15V power supply respectively to filter the interference of AC noise.

Wherein, bootstrapping drive circuit includes: the power amplifier circuit comprises two IR2110 drivers and 4 MOS (metal oxide semiconductor) tubes, wherein the IR2110 drivers are connected by an H-bridge circuit consisting of 4 MOS tubes, an iron core coil assembly is connected between the H-bridge circuit, the power supply voltage of the IR2110 drivers is 15V power supply voltage, the output working power supply is a suspension power supply, and C3 is a bootstrap capacitor in the figure; vd is a charging diode for preventing the voltage at the two ends of the bootstrap capacitor from discharging; c4, C5 are bypass capacitors whose purpose is to provide transient current to the capacitive load of the switch.

A main circuit: magnetic current signals of the iron core coil assembly are measured through the measuring sensor circuit and transmitted to the computer, when output signals of the measuring sensor circuit are larger than control signals, the computer outputs control signals through the D/A converter and inputs the control signals to a pin 9 and a pin 11 of the UC3637, the pin 4 is conducted, conducting signals of the pin 4 are transmitted to a pin 10 of the left side IR2110 driver and a pin 12 of the right side IR2110, and the pin 10 of the upper channel and the pin 12 of the lower channel are conducted respectively. At this time, VF1 and VF2 in an H bridge circuit among 2 pieces of IR2110 are triggered to be conducted, and the iron core and spiral tube assembly is electrified in a positive phase; when the output signal of the measurement sensor circuit is greater than the control signal, the pin 7 in the UC3637 is turned on, the on signal of the pin 7 is transmitted to the pin 12 of the left IR2110 and the pin 10 of the right IR2110, so that the pin 12 of the lower channel and the pin 1O of the upper channel are respectively turned on, at this time, VF4 and VF3 in the "H" bridge circuit are triggered to be turned on, and the core-solenoid assembly is powered in reverse phase.

A protection circuit: TA is a current sampling element for over-current protection of IR 2110; vf is a voltage feedback signal, forming a closed-loop voltage regulating network.

Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the utility model, and the appended claims are intended to cover such modifications and equivalents as fall within the true spirit and scope of the utility model.

Claims

1. A low frequency function magnetic moment generating device, comprising: the method comprises the following steps: a digital controller for receiving an external control signal and an output signal of the measuring sensor and outputting a pulse width modulation signal; the power amplifier receives the pulse width modulation signal output by the digital controller, linearly amplifies the pulse width modulation signal and outputs a power signal to the outside; the iron core solenoid assembly receives a power signal output by the power amplifier and generates a magnetic moment consistent with the change rule of an input signal; and a measurement sensor circuit that measures a current value in the core solenoidal coil and inputs the measurement result into the digital controller.

2. The low frequency function magnetic moment generating device according to claim 1, wherein: the digital controller adopts UC3637 double PWM control chips to output two paths of PWM signals, and the pulse width of the PWM signals is used for controlling the time of generating magnetic moment.

3. A low frequency function magnetic moment generating device as claimed in claim 2, wherein: the power amplifier adopts an H-bridge circuit and generates the current of the corresponding driving coil according to the instruction of a digital controller.

4. The low frequency function magnetic moment generating device according to claim 1, wherein: the iron core spiral tube component is formed by winding a conducting wire on a magnetic rod.

5. A low frequency function magnetic moment generating device as claimed in claim 3, wherein: the measurement sensor circuit includes: the current acquisition chip, the current sensor and the differential amplifier are used for acquiring magnetic current signals of the iron core solenoid assembly and outputting voltage signals; the differential amplifier is used for amplifying the output voltage signal of the current sensor and transmitting the signal to the AD sampling circuit.

6. The device for generating a magnetic moment according to claim 5, wherein: the current acquisition chip adopts an ACS712 chip, and a low-bias linear Hall sensor circuit is arranged in the current acquisition chip and can output voltage proportional to detected alternating current or direct current.

7. The device for generating a magnetic moment according to claim 6, wherein: the differential amplifier adopts AD8827, amplifies the front end voltage, and outputs a signal to the digital controller through the AD sampling circuit.