CN212572399U - Control device of variable frequency power supply - Google Patents
Control device of variable frequency power supply Download PDFInfo
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- CN212572399U CN212572399U CN202021269844.3U CN202021269844U CN212572399U CN 212572399 U CN212572399 U CN 212572399U CN 202021269844 U CN202021269844 U CN 202021269844U CN 212572399 U CN212572399 U CN 212572399U
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Abstract
The utility model provides a control device of a variable frequency power supply, which comprises a power supply module, a sampling module, a frequency modulation module and a pulse width modulation module; the power supply module is used for converting an alternating current power supply provided by the variable frequency power supply into a direct current power supply required by work; the sampling module is used for sampling the direct-current power supply acquired by the power supply module to acquire a direct-current signal in the direct-current power supply; the frequency modulation module is used for modulating the direct current signal acquired by the sampling module according to preset frequency information to acquire a driving signal; the pulse width modulation module is used for modulating the pulse width of the driving signal acquired by the frequency modulation module to acquire a voltage adjustment signal; the voltage adjusting signal obtained by the pulse width modulation module is a multi-pulse width modulation signal obtained by processing an alternating current power supply provided by a variable frequency power supply by the device; therefore, the device realizes the acquisition of multiple pulse width modulation signals.
Description
Technical Field
The utility model relates to a power technical field, in particular to variable frequency power supply's controlling means.
Background
The variable frequency power supply outputs pure sine waves by alternating current → direct current → alternating current conversion of alternating current in commercial power, and the output frequency and voltage are adjustable within a certain range. The variable frequency power supply can simulate and output power grid indexes of different countries, and provides pure, reliable, low-harmonic-distortion and high-stability voltage and frequency sine wave power supply output for export electrical appliance manufacturers in the applications of design, development, production, detection and the like.
Multiple pwm signals are a very effective technique for controlling analog circuits using the digital output of a microprocessor, and are widely used in many fields ranging from measurement, communications, to power control and conversion.
Therefore, there is a need for a device for converting the signal provided by the variable frequency power supply into a multi-pulse width modulation signal to control the analog circuit.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a variable frequency power supply's controlling means for the realization is to many pulse width modulation signal's acquirement.
The embodiment of the utility model provides a control device of variable frequency power supply, the device, including power supply module, sampling module, frequency modulation module and pulse width modulation module; wherein,
the power supply module is used for converting an alternating current power supply provided by the variable frequency power supply into a direct current power supply required by work;
the sampling module is used for sampling the direct-current power supply acquired by the power supply module to acquire a direct-current signal in the direct-current power supply;
the frequency modulation module is used for modulating the direct current signal acquired by the sampling module according to preset frequency information to acquire a driving signal;
the pulse width modulation module is used for modulating the pulse width of the driving signal acquired by the frequency modulation module to acquire a voltage adjustment signal.
In one embodiment, the power supply module comprises a power transformer, a rectifying unit, a filtering unit and a voltage stabilizing unit; the power transformer, the rectifying unit, the filtering unit and the voltage stabilizing unit are sequentially connected; wherein,
the power transformer is used for converting the alternating current power supply provided by the variable frequency power supply into a low-voltage alternating current power supply required by work;
the rectifying unit is used for rectifying the voltage of the low-voltage alternating-current power supply acquired by the power transformer into unidirectional pulsating voltage;
the filtering unit is used for filtering alternating current components in the unidirectional pulsating voltage obtained by the rectifying unit to obtain a direct current power supply;
and the voltage stabilizing unit is used for keeping the voltage of the direct current power supply obtained by the filtering unit stable when the voltage of a power grid or the voltage of a load changes.
In one embodiment, the device further comprises an emergency processing module and a control module; the control module is connected with the emergency processing module;
the control module is used for receiving an emergency instruction transmitted by a worker and transmitting the emergency instruction to the emergency processing module; the emergency processing module is used for executing corresponding emergency operation according to the emergency instruction transmitted by the control module;
the emergency instruction comprises an emergency stop instruction or a reset instruction.
In one embodiment, the apparatus further comprises a fault detection module and a display; the control module is connected with the fault detection module and the display;
the fault detection module comprises a plurality of fault detection nodes; the fault detection node is used for acquiring fault information of the position of the fault detection node and transmitting the fault information to the control module; and the control module is used for transmitting the fault information to the display for displaying.
In one embodiment, the fault information includes one or more of over-temperature information, over-current information, and over-voltage information.
In one embodiment, the apparatus further comprises a temperature detection module; the temperature detection module is electrically connected with the control module;
the temperature detection module comprises a temperature detector; the temperature detector is used for acquiring temperature information of a working environment where the device is located and transmitting the temperature information to the control module; the control module is further configured to transmit the temperature information to the display for display.
In one embodiment, the apparatus further comprises a wireless communication module; the control module is connected with the wireless communication module;
the control module is further used for comparing the temperature information with preset temperature threshold information, and when the temperature information exceeds the temperature threshold information, the control module transmits overhigh temperature information to communication equipment at a worker through the wireless communication module so as to remind the worker that the temperature of the working environment of the device is overhigh.
In one embodiment, the wireless communication module comprises one or more of a WiFi communication module, a 5G communication module and a ZigBee communication module;
the communication equipment comprises one or more of a smart phone with a communication function, a tablet computer and a personal computer.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic structural diagram of a control device of a variable frequency power supply provided by the present invention;
fig. 2 is a circuit structure diagram of a control device of a variable frequency power supply according to the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.
The embodiment of the utility model provides a control device of variable frequency power supply, as shown in fig. 1, the device includes a power supply module 11, a sampling module 12, a frequency modulation module 13 and a pulse width modulation 14 module; wherein,
the power supply module 11 is used for converting an alternating current power supply provided by the variable frequency power supply into a direct current power supply required by work;
the sampling module 12 is configured to sample the dc power source obtained by the power supply module 11 to obtain a dc signal in the dc power source;
the frequency modulation module 13 is configured to modulate the dc signal obtained by the sampling module 12 according to preset frequency information to obtain a driving signal;
and a pulse width modulation module 14, configured to perform modulation processing on the pulse width of the driving signal obtained by the frequency modulation module 13, so as to obtain a voltage adjustment signal.
The working principle of the device is as follows: the power supply module 11 converts an alternating current power supply provided by the variable frequency power supply into a direct current power supply required by work; the sampling module 12 samples the direct-current power supply obtained by the power supply module 11 to obtain a direct-current signal in the direct-current power supply; the frequency modulation module 13 modulates the direct current signal acquired by the sampling module 12 according to preset frequency information to acquire a driving signal; the pulse width modulation module 14 modulates the pulse width of the driving signal acquired by the frequency modulation module 13 to acquire a voltage adjustment signal.
The beneficial effect of above-mentioned device lies in: the alternating current power supply provided by the variable frequency power supply is converted into the direct current power supply required by work through the power supply module; the sampling module samples the direct current power supply acquired by the power supply module, so that the direct current signal in the direct current power supply is acquired; the direct current signal acquired by the sampling module is modulated by the frequency modulation module according to the preset frequency information, so that the driving signal is acquired; modulating the pulse width of the driving signal acquired by the frequency modulation module through a pulse width modulation module, thereby acquiring a voltage adjustment signal; the voltage adjusting signal obtained by the pulse width modulation module is a multi-pulse width modulation signal obtained by processing an alternating current power supply provided by a variable frequency power supply by the device; therefore, the device realizes the acquisition of multiple pulse width modulation signals.
In a specific embodiment, the sampling module is mainly composed of an IL084 integrated operational amplifier, firstly, signals are collected through a differential circuit, the amplitude of the signals is adjusted by using the parameters of the differential circuit, and then, the processed direct current signals are sent to the frequency modulation module through a precise rectifying and amplifying circuit composed of the operational amplifier.
In a specific embodiment, the frequency modulation module mainly comprises a frequency division unit and a gating unit, wherein the frequency division unit comprises fixed frequencies of 50Hz, 60Hz and 400Hz selected by an external band switch and variable frequencies of 47-63 Hz controlled by an external potentiometer. The step state of the external band switch is interfaced to the 74LS148 digital decoder and the gating frequency is used to modulate the drive signal.
In a specific embodiment, the pulse width modulation module receives a resistance signal of an external potentiometer, and converts the resistance signal into an electrical signal through a processing circuit formed by integrating OP07 operational amplifiers to modulate the pulse width of the driving signal, thereby implementing the adjustment of the output voltage.
In an embodiment, a circuit structure of a control device of a variable frequency power supply is shown in fig. 2.
In a specific embodiment, the driving signal circuit receives the modulated driving signal, the modulated driving signal is amplified and buffered by an operational amplifier and then is combined with a gating frequency to form a pulse width modulation signal driving pulse, and four driving signals are formed after the pulse width modulation signal driving pulse passes through a direction converter to respectively control a full-bridge inverter circuit formed by IGBTs; the circuit adopts a CPU and peripheral circuits thereof to select PIC16P877 as a control main chip, and the peripheral circuits thereof comprise a crystal oscillator, a reference power supply and the like.
In one embodiment, the sine wave generator and the triangular wave generator are designed by using integrated circuits such as "TL 084IN PDIP14 TI", "CD 4093BE DIP14 TI", "MC 14584 BCP", and the generated sine wave and triangular wave are processed and synthesized into a multi-pulse width modulation signal for modulation processing.
In one embodiment, the resistance matching degree is adjusted by reconfiguring the resistance parameters to achieve the expected waveform target, thereby avoiding the defect of waveform distortion in the traditional test process.
In one embodiment, the problem of inaccurate output overcurrent regulation in the traditional test is solved by improving the rectifying circuit and adding the direct current filter capacitor.
In one embodiment, the power supply module comprises a power transformer, a rectifying unit, a filtering unit and a voltage stabilizing unit; the power transformer, the rectifying unit, the filtering unit and the voltage stabilizing unit are sequentially connected; wherein,
the power transformer is used for converting an alternating current power supply provided by the variable frequency power supply into a low-voltage alternating current power supply required by work;
the rectifying unit is used for rectifying the voltage of the low-voltage alternating current power supply acquired by the power transformer into unidirectional pulsating voltage;
the filtering unit is used for filtering alternating current components in the unidirectional pulsating voltage obtained by the rectifying unit to obtain a direct current power supply;
and the voltage stabilizing unit is used for keeping the voltage of the direct-current power supply obtained by the filtering unit stable when the voltage of the power grid or the load voltage changes. In the technical scheme, the alternating current power supply provided by the variable frequency power supply is converted into the low-voltage alternating current power supply required by work through the power transformer; and the alternating current power supply is converted into a direct current power supply required by work through the rectifying unit, the filtering unit and the voltage stabilizing unit.
In a specific embodiment, the power supply module adopts three independent single-phase rectifier bridges and an S0854 three-terminal voltage stabilizer, and power is supplied through three-phase voltage at the input end simultaneously, so that the power supply module can work reliably and stably under the condition that any one phase is electrified.
In one embodiment, the device further comprises an emergency processing module and a control module; the control module is connected with the emergency processing module;
the control module is used for receiving the emergency instruction transmitted by the staff and transmitting the emergency instruction to the emergency processing module; the emergency processing module is used for executing corresponding emergency operation according to the emergency instruction transmitted by the control module;
and emergency instructions comprise emergency stop instructions or reset instructions. In the technical scheme, the emergency instruction is transmitted to the control module by the staff, and the emergency instruction transmitted by the staff is transmitted to the emergency processing module by the control module; the emergency processing module executes corresponding emergency operation according to the transmitted emergency instruction, so that the function of performing emergency operation of the device according to the emergency instruction transmitted by the working personnel is realized.
In one embodiment, the apparatus further comprises a fault detection module and a display; the control module is connected with the fault detection module and the display;
a fault detection module comprising a plurality of fault detection nodes; the fault detection node is used for acquiring fault information of the position of the fault detection node and transmitting the fault information to the control module; and the control module is used for transmitting the fault information to the display for displaying. According to the technical scheme, the fault information of the position of the fault detection node is acquired through the plurality of fault detection nodes in the fault detection module, and the fault information is transmitted to the display to be displayed through the control module, so that the fault information is acquired by a worker in real time through the display.
In one embodiment, the fault detection module transmits the fault information to the control module, and the control module transmits the fault information to the display; the display displays the fault information code through the 74LC47 decoder and the nixie tube; the fault detection module adopts a PIC16F877A-I/P DIP40 Microchip IC chip to process relevant fault signals and transmits and displays fault codes to a display through the controller.
In one embodiment, the fault information includes one or more of over-temperature information, over-current information, and over-voltage information.
In one embodiment, the apparatus further comprises a temperature detection module; the temperature detection module is electrically connected with the control module;
a temperature detection module comprising a temperature detector; the temperature detector is used for acquiring the temperature information of the working environment of the device and transmitting the temperature information to the control module; and the control module is also used for transmitting the temperature information to the display for displaying. According to the technical scheme, the temperature detector in the temperature detection module is used for acquiring the temperature information of the working environment where the device is located, the temperature information is transmitted to the display through the control module to be displayed, and the temperature information is displayed to workers in real time.
In one embodiment, the apparatus further comprises a wireless communication module; the control module is connected with the wireless communication module;
the control module is also used for comparing the temperature information with preset temperature threshold information, and when the temperature information exceeds the temperature threshold information, the control module transmits overhigh temperature information to the communication equipment at the position of the working personnel through the wireless communication module so as to remind the working environment of the working personnel device that the temperature is overhigh. According to the technical scheme, the temperature information acquired by the temperature detection module is compared with the preset temperature threshold value information through the control module, when the temperature information exceeds the temperature threshold value information, the overhigh temperature information is transmitted to the communication equipment of the worker through the wireless communication module, the worker is reminded that the temperature of the working environment of the worker is overhigh, and therefore the worker can timely cool down the working environment of the device.
In one embodiment, the wireless communication module comprises one or more of a WiFi communication module, a 5G communication module and a ZigBee communication module; in the technical scheme, the functions of the wireless communication module are realized through various communication modules.
The communication device comprises one or more of a smart phone with a communication function, a tablet computer and a personal computer. In the technical scheme, the functions of the communication equipment are realized through various devices.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. The control device of the variable frequency power supply is characterized by comprising a power supply module, a sampling module, a frequency modulation module and a pulse width modulation module; wherein,
the power supply module is used for converting an alternating current power supply provided by the variable frequency power supply into a direct current power supply required by work;
the sampling module is used for sampling the direct-current power supply acquired by the power supply module to acquire a direct-current signal in the direct-current power supply;
the frequency modulation module is used for modulating the direct current signal acquired by the sampling module according to preset frequency information to acquire a driving signal;
the pulse width modulation module is used for modulating the pulse width of the driving signal acquired by the frequency modulation module to acquire a voltage adjustment signal.
2. The apparatus of claim 1,
the power supply module comprises a power transformer, a rectifying unit, a filtering unit and a voltage stabilizing unit; the power transformer, the rectifying unit, the filtering unit and the voltage stabilizing unit are sequentially connected; wherein,
the power transformer is used for converting the alternating current power supply provided by the variable frequency power supply into a low-voltage alternating current power supply required by work;
the rectifying unit is used for rectifying the voltage of the low-voltage alternating-current power supply acquired by the power transformer into unidirectional pulsating voltage;
the filtering unit is used for filtering alternating current components in the unidirectional pulsating voltage obtained by the rectifying unit to obtain a direct current power supply;
and the voltage stabilizing unit is used for keeping the voltage of the direct current power supply obtained by the filtering unit stable when the voltage of a power grid or the voltage of a load changes.
3. The apparatus of claim 1,
the device also comprises an emergency processing module and a control module; the control module is connected with the emergency processing module;
the control module is used for receiving an emergency instruction transmitted by a worker and transmitting the emergency instruction to the emergency processing module; the emergency processing module is used for executing corresponding emergency operation according to the emergency instruction transmitted by the control module;
the emergency instruction comprises an emergency stop instruction or a reset instruction.
4. The apparatus of claim 3,
the device also comprises a fault detection module and a display; the control module is connected with the fault detection module and the display;
the fault detection module comprises a plurality of fault detection nodes; the fault detection node is used for acquiring fault information of the position of the fault detection node and transmitting the fault information to the control module; and the control module is used for transmitting the fault information to the display for displaying.
5. The apparatus of claim 4,
the fault information comprises one or more of over-temperature information, over-current information and over-voltage information.
6. The apparatus of claim 4,
the device also comprises a temperature detection module; the temperature detection module is electrically connected with the control module;
the temperature detection module comprises a temperature detector; the temperature detector is used for acquiring temperature information of a working environment where the device is located and transmitting the temperature information to the control module; the control module is further configured to transmit the temperature information to the display for display.
7. The apparatus of claim 6,
the device further comprises a wireless communication module; the control module is connected with the wireless communication module;
the control module is further used for comparing the temperature information with preset temperature threshold information, and when the temperature information exceeds the temperature threshold information, the control module transmits overhigh temperature information to communication equipment at a worker through the wireless communication module so as to remind the worker that the temperature of the working environment of the device is overhigh.
8. The apparatus of claim 7,
the wireless communication module comprises one or more of a WiFi communication module, a 5G communication module and a ZigBee communication module;
the communication equipment comprises one or more of a smart phone with a communication function, a tablet computer and a personal computer.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116566219A (en) * | 2023-07-10 | 2023-08-08 | 深圳市嘉力电气技术有限公司 | Frequency control method of variable frequency power supply |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116566219A (en) * | 2023-07-10 | 2023-08-08 | 深圳市嘉力电气技术有限公司 | Frequency control method of variable frequency power supply |
| CN116566219B (en) * | 2023-07-10 | 2023-10-31 | 深圳市嘉力电气技术有限公司 | Frequency control method of variable frequency power supply |
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