System for automatic frequency conversion control of high-voltage equipment

Abstract

The utility model provides a system for automatic frequency conversion control of high-voltage equipment, which comprises an alternating-current power supply module and a direct-current control voltage output circuit which are connected with the input end of a frequency converter, and the output end of the frequency converter is connected with an alternating-current voltage regulator motor through a motor control circuit. The direct current control voltage output circuit composed of the upper computer and the analog quantity conversion module controls the frequency converter to output voltage so as to control the rotating speed of the motor of the alternating current voltage regulator, the frequency converter and alternating current motor voltage regulation control mode is used, compared with direct current motor speed regulation, the anti-interference capability is higher, and the control over the rotating speed of the motor of the alternating current voltage regulator is achieved. The problem that a carbon brush in the direct current motor is easy to damage is solved, the service life of the motor is longer, and compared with the direct current motor, the speed regulation range is wider, the circuit structure is simple and the reliability is high; an analog quantity conversion module in the direct-current control voltage output circuit can output a control instruction of the upper computer as direct-current control voltage, and output of the frequency converter is controlled through the direct-current voltage.

Description

TECHNICAL FIELD

[0001] The utility model belongs to motor control technical field, concretely relates to a system for high voltage equipment automatic frequency conversion control. BACKGROUND

[0002] The voltage regulator of the equipment is commonly controlled by the DC servo voltage regulation mode, and the DC motor is used for voltage regulation, but the internal carbon brush of the DC motor is easily worn and damaged, and the carbon brush needs to be replaced 2-3 times every month on average, so the failure rate is high; moreover, the DC servo voltage regulation device has poor anti-electromagnetic interference capability, and the failure rate of the voltage regulation control system is very high; under the DC servo speed regulation mode, the output voltage of the voltage regulator is not smooth enough, and the stability is not good, so the use performance of the equipment is greatly reduced; meanwhile, the electrical control of the DC speed regulation device is relatively complex, and the maintenance difficulty is increased. CONTENT

[0003] The utility model discloses a system for high voltage equipment automatic frequency conversion control to overcome the technical problem that the internal carbon brush of the DC motor is easily worn and damaged in the prior art.

[0004] To solve the above technical problems, the utility model adopts the following technical scheme:

[0005] A system for high voltage equipment automatic frequency conversion control, frequency converter, the first input end of the frequency converter is connected with AC power supply, the second input end of frequency converter is connected with DC control voltage output circuit, the output end of frequency converter is connected with AC voltage regulator motor through motor control circuit;

[0006] The DC control voltage output circuit includes host computer and analog quantity conversion module, and the output end of the host computer is connected with the input end of the analog quantity conversion module, and the output end of the analog quantity conversion module is connected with the second input end of the frequency converter.

[0007] Further, the switch and power filter are further arranged between the AC power supply and the first input end of the frequency converter.

[0008] Further, the grounding port is further arranged on the frequency converter.

[0009] Further, the switch and the fuse are further installed between the analog quantity conversion module and the second input end of the frequency converter.

[0010] Further, the input of the analog quantity conversion module is current, and the output is DC voltage.

[0011] Further, the DC voltage range is 0-10v.

[0012] Further, the motor control circuit comprises an alternating voltage regulator motor forward and reverse interlocking direction control circuit and an alternating voltage regulator motor forward and reverse interlocking speed control circuit.

[0013] Further, the alternating voltage regulator motor is internally provided with an alternating voltage regulator motor limiting circuit.

[0014] Further, the frequency converter is further provided with a second output port, and a frequency converter self-starting circuit is connected to the second output port.

[0015] Further, the input voltage at the first input end of the frequency converter is 380v.

[0016] Compared with the prior art, the system has the following beneficial technical effects:

[0017] The utility model provides a system for high voltage equipment automatic frequency conversion control, including with frequency converter input end connection's alternating current power module and direct current control voltage output circuit, frequency converter output passes through motor control circuit and connects alternating voltage regulator motor, and the direct current control voltage output circuit that the host computer and analog quantity conversion module are controlled frequency converter output voltage and then realize to alternating voltage regulator motor speed control, the utility model discloses use frequency converter + alternating current motor voltage regulation control mode, compared with direct current motor speed regulation, alternating frequency converter speed control, and the output voltage of voltage regulator is smooth and stable, and the anti -interference ability is stronger, solves the problem that direct current motor internal carbon brush is easy to damage, and the motor life is longer, compared with direct current motor, and the speed regulation range is wider, and the circuit structure is simple, and the reliability is strong.

[0018] The analog quantity conversion module in the direct current control voltage output circuit can output the control instruction of the host computer as a direct current control voltage, and control the output of the frequency converter through the direct current voltage.

[0019] Preferably, a power filter is installed between the alternating current power supply and the first input end of the frequency converter, which can effectively suppress electromagnetic interference and improve the stability and reliability of the equipment.

[0020] Preferably, a fuse is installed in the direct current control voltage output circuit, which protects the circuit and the analog quantity conversion module.

[0021] Preferably, a fuse is installed in the motor control circuit, which is arranged at the input port of the alternating voltage regulator motor and protects the alternating voltage regulator motor.

[0022] Preferably, the motor control circuit comprises an alternating voltage regulator motor forward and reverse interlocking direction control circuit and an alternating voltage regulator motor forward and reverse interlocking speed control circuit, which can control the forward and reverse rotation of the alternating voltage regulator motor. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a system structure diagram for automatic frequency conversion control of high-voltage equipment in the embodiment of the utility model;

[0024] Figure 2 The utility model discloses an alternating voltage regulator motor positive and negative rotation interlocking speed control circuit structure diagram in the embodiment of the utility model,

[0025] Figure 3 The utility model discloses an alternating voltage regulator motor internal alternating voltage regulator motor limiting circuit structure diagram in the embodiment of the utility model. DETAILED DESCRIPTION

[0026] In order to make the personnel in the technical field better understand the utility model scheme, the technical scheme in the embodiment of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiment of the utility model, and obviously, the described embodiment is only a part of the embodiment of the utility model, not all. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor should belong to the protection scope of the utility model.

[0027] It should be noted that: similar signs and letters show similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0028] In one embodiment of the utility model, as shown in Figure 1 The utility model discloses a system for automatic frequency conversion control of high-voltage equipment, including frequency converter, alternating current power supply, direct current control voltage output circuit, motor control circuit and alternating voltage regulator motor, wherein alternating current power supply is connected with the first input of frequency converter, and the first input includes R, S and T three interfaces, that is, alternating current power supply provides three-phase electricity to frequency converter power supply, direct current control voltage output circuit is connected with frequency converter through the second input of frequency converter, and the second input of frequency converter includes AI and GND two interfaces, the second input of frequency converter is connected with the output of analog quantity conversion module, and the input of analog quantity conversion module is connected with host computer, and the three constitute the direct current control voltage output circuit of frequency converter, and the output voltage of frequency converter is input to the voltage control frequency converter through direct current control voltage output circuit, and then the control of alternating voltage regulator speed is realized, and the first output of frequency converter is connected with voltage regulator motor through motor control circuit, and the first output of frequency converter includes U, V and W three ports.

[0029] In order to ensure the normal work of the frequency converter, one port of the frequency converter needs to be grounded; a second output end is further arranged on the frequency converter, the second output end is connected with the self-starting circuit of the frequency converter, the second output end comprises a DI1 port and a com port, the self-starting circuit of the frequency converter is electrically connected with the DI1 port and the com port, and a control switch is arranged in the connecting circuit.

[0030] The analog quantity conversion module is an electronic device for converting analog signals into digital signals or other forms of signals for subsequent processing and transmission.

[0031] In an embodiment of the utility model, the output voltage range of the analog quantity conversion module is 0-10v direct current.

[0032] As an optional mode, a fuse is installed between the output end of the analog quantity conversion module and the second input end of the frequency converter to protect the direct current control voltage output circuit.

[0033] The first output end of the frequency converter is connected with the voltage regulator motor through a motor control circuit, the motor control circuit comprises an alternating voltage regulator motor forward and reverse interlocking direction control circuit and an alternating voltage regulator motor forward and reverse interlocking speed control circuit, and the structure of the alternating voltage regulator motor forward and reverse interlocking speed control circuit is as shown in Figure 2 In addition, a fuse is further arranged in the motor control circuit, the fuse is installed near the input port of the voltage regulator motor, and the fuse is mainly used for protecting the voltage regulator motor.

[0034] As shown in Figure 3 An alternating voltage regulator motor limiting circuit is further arranged in the voltage regulator motor, and the alternating voltage regulator motor limiting circuit is used for controlling the upper limit and the lower limit.

[0035] In still another embodiment of the utility model, provide a kind of for high voltage equipment automatic frequency conversion control system, including frequency converter, alternating current power supply, DC control voltage output circuit, motor control circuit and AC voltage regulator motor, wherein alternating current power supply is connected with the first input end of frequency converter, i.e.

[0036] Power filter is installed on the connecting circuit between alternating current power supply and frequency converter, and power filter is a filter circuit composed of capacitor, inductor and resistor, also known as "power EMI filter", which is a bidirectional passive network based on impedance adaptation network. When the input and output sides of power filter are more adapted to the impedance of power supply and load side, the attenuation of electromagnetic interference is more effective. The filter can effectively filter out the specific frequency point in the power line or the frequency outside the frequency point, so as to obtain a specific frequency power signal or eliminate a specific frequency power signal.

[0037] Working principle:

[0038] The output of alternating current power supply is connected to frequency converter for power supply after being processed by power filter;

[0039] The grounding end of frequency converter is grounded;

[0040] The frequency converter is self-started;

[0041] The host computer issues an instruction signal, and the analog quantity conversion module converts it into a DC voltage, which is input into the frequency converter;

[0042] The frequency converter outputs corresponding AC voltage according to the input self-control voltage, thereby realizing the start of AC voltage regulator motor.

[0043] The forward and reverse rotation of AC voltage regulator motor is controlled by motor control circuit.

[0044] The above is only the preferred specific implementation of the utility model, but the protection scope of the utility model is not limited to this. Any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which should be covered within the protection scope of the utility model.

Claims

1. A system for automatic variable frequency control of high voltage equipment, characterized by, The frequency converter is provided with an AC power supply connected to a first input end, a DC control voltage output circuit connected to a second input end, and an AC voltage regulator motor connected to a first output end through a motor control circuit. The DC control voltage output circuit comprises a host computer and an analog quantity conversion module, the output end of the host computer is connected to the input end of the analog quantity conversion module, and the output end of the analog quantity conversion module is connected to the second input end of the frequency converter.

2. A system for automatic variable frequency control of high voltage equipment as claimed in claim 1 wherein, A switch and a power filter are further arranged between the AC power supply and the first input end of the frequency converter.

3. A system for automatic variable frequency control of high voltage equipment as claimed in claim 1 wherein, A grounding port is further arranged on the frequency converter.

4. A system for automatic variable frequency control of high voltage equipment as claimed in claim 1 wherein, A switch and a fuse are further arranged between the analog quantity conversion module and the second input end of the frequency converter.

5. A system for automatic variable frequency control of high voltage equipment according to claim 1 or 4, characterized in that, The input of the analog quantity conversion module is current, and the output is DC voltage.

6. A system for automatic variable frequency control of high voltage equipment as claimed in claim 5 wherein, The range of the DC voltage is 0-10v.

7. A system for automatic variable frequency control of high voltage equipment as claimed in claim 1 wherein, The motor control circuit comprises an AC voltage regulator motor forward and reverse interlocking direction control circuit and an AC voltage regulator motor forward and reverse interlocking speed control circuit.

8. A system for automatic variable frequency control of high voltage equipment as claimed in claim 1 wherein, An AC voltage regulator motor limiting circuit is arranged in the AC voltage regulator motor.

9. A system for automatic variable frequency control of high voltage equipment as claimed in claim 1 wherein, The frequency converter is further provided with a second output end connected to a frequency converter self-starting circuit.

10. A system for automatic variable frequency control of high voltage equipment as claimed in claim 1 wherein, The input voltage at the first input end of the frequency converter is 380v.

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