CN212210870U - Simple inverter power supply system and simple inverter power supply - Google Patents

Abstract

The utility model provides a simple and easy invertion power supply system and simple and easy invertion power supply, including host system, host system links to each other with temperature sampling module, protection module, keyboard display module, voltage current sampling module, drive module links to each other with the inverter module, the inverter module links to each other with voltage current sampling module, drive module still produces the module with the PWM ripples and links to each other, the PWM ripples produces the module and produces the module with the triangle ripples and just joins in marriage ripples and produce the module and link to each other, has the real-time sampling to simple and easy invertion power supply output current voltage, power, efficiency temperature, realizes the advantage to its overheated, undervoltage protection simultaneously.

Description

Simple inverter power supply system and simple inverter power supply

Technical Field

The utility model belongs to machine-building and power field, concretely relates to simple and easy invertion power supply system and simple and easy invertion power supply.

Background

The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.

The current simple inverter power supply outputs current, voltage, power, efficiency and temperature, is difficult to acquire data in real time, and lacks the protection on overheating and undervoltage.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve above-mentioned problem, provide a simple and easy inverter power supply system and simple and easy inverter power supply, the utility model discloses a solve how to sample the real-time of simple and easy inverter power supply output current voltage, power, efficiency and temperature, realize the technical problem to its overheated, undervoltage protection simultaneously.

According to some embodiments, the utility model adopts the following technical scheme:

the simple inverter power supply system comprises a main control module, wherein the main control module is connected with a temperature sampling module, a protection module, a keyboard display module, a voltage and current sampling module and a driving module, the driving module is connected with an inverter module, the inverter module is connected with the voltage and current sampling module, and the driving module is also connected with a PWM wave generation module.

In addition, according to the utility model discloses simple and easy contravariant power supply system can also have following additional technical characterstic:

preferably, the main control module adopts a PIC16F876 singlechip.

Preferably, the inverter module adopts a full-bridge DC-AC converter.

Preferably, the alternating current and voltage acquisition module adopts a mutual inductor.

Preferably, the keyboard display module adopts a four-digit nixie tube and a keyboard control chip CH 452.

Preferably, the temperature measuring module adopts a DS18B20 temperature sensor.

Preferably, the PIC16F876 singlechip is internally provided with an A/D conversion module.

Preferably, the driving module includes a transistor.

Preferably, the protection module is connected with a buzzer.

A simple inverter power supply comprises a simple inverter power supply system.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses a host system control chip control temperature sampling module, voltage current sampling module carry out real-time sampling to inverter circuit as control chip, and control protection module carries out real-time protection, has realized the real-time sampling to inverter circuit's input/output current voltage, power, efficiency, temperature to the protection to faults such as overheated, under-voltage has been accomplished.

Drawings

The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention.

Fig. 1 is a schematic structural diagram of a simple inverter power supply system of the present invention;

fig. 2 is a full-bridge inverter circuit diagram of the simple inverter power supply system of the present invention;

fig. 3 is an ac voltage sampling circuit diagram of the simple inverter power supply system of the present invention;

fig. 4 is an ac current sampling circuit diagram of the simple inverter power supply system of the present invention;

fig. 5 is a circuit diagram of the dc voltage sampling of the simple inverter system of the present invention;

fig. 6 is a circuit diagram of the dc current sampling of the simple inverter system of the present invention;

fig. 7 is a circuit diagram of the temperature acquisition of the simple inverter power system of the present invention;

fig. 8 is a keyboard display control circuit diagram of the simple inverter power supply system of the present invention;

fig. 9 is a circuit diagram of PWM wave generation of the simple inverter power supply system of the present invention;

fig. 10 is a circuit diagram for generating triangular waves of the simple inverter power supply system of the present invention;

fig. 11 is a flowchart of the operation of the simple inverter power supply system of the present invention.

Description of reference numerals:

in fig. 1-11, a master control module 1; a temperature sampling module 2; a protection module 3; a drive module 4; a keyboard display module 5; a PWM wave generation module 6; an inverter module 7; a voltage current sampling module 8; a positive sine wave generation module 9; a triangular wave generating module 10.

The specific implementation mode is as follows:

the present invention will be further explained with reference to the accompanying drawings and examples.

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

As shown in fig. 1 to 11, the simple inverter power supply system includes a main control module 1, the main control module 1 is connected to a temperature sampling module 2, a protection module 3, a keyboard display module 5, a voltage and current sampling module 8, and a driving module 4, the driving module 4 is connected to an inverter module 7, the inverter module 7 is connected to the voltage and current sampling module 8, and the driving module 4 is further connected to a PWM wave generation module 6.

The main control module 1 adopts a PIC16F876 singlechip. The inverter module 7 employs a full bridge DC-AC converter. The alternating current voltage acquisition module adopts a mutual inductor. The keyboard display module 5 adopts a four-digit nixie tube and a keyboard control chip CH 452. The temperature measurement module employs a DS18B20 temperature sensor.

The PIC16F876 singlechip is internally provided with an A/D conversion module. The driving module 4 includes a transistor. The protection module 3 is connected with the buzzer.

The simple inverter power supply takes PIC16F876 as a main control module 1 and consists of a PWM wave generation module 6 (generated by a non-integrated chip), a driving module 4, an inverter module 7, a voltage and current sampling module 8, a protection module 3 and a keyboard display module 5. The main control module 1 adopts a PIC16F876 singlechip as a control core, carries out A/D conversion processing and analysis calculation on data obtained by current and voltage sampling, and displays the data through the keyboard display module 5. The keyboard display module 5 adopts a nixie tube driving and keyboard control chip CH 452. Four paths of PWM waves are generated by comparing triangular waves with sine waves, a driving circuit consisting of triodes is utilized to drive an inverter module to generate alternating current, and rated alternating current output voltage is obtained after output and filtering. The protection module 3 has the functions of overheating, overload protection, short-circuit protection and undervoltage protection, and when the system is in an abnormal operation state, the alarm is given and the circuit is automatically disconnected so as to ensure safety. The device has the advantages of simple structure, complete functions and stable and reliable operation.

The main control module 1 is in a core position in the system, and the work of the main control module comprises the acquisition of voltage and current signals, the data processing and the control of the operation of an execution mechanism. The PIC16F876 has the advantages of low price, high speed, low power consumption, small volume, strong anti-interference performance and the like, and the PIC16F876 is internally provided with an A/D conversion performance module, so that a hardware circuit and software programming can be greatly simplified.

The PWM wave signal is generated by using a hardware circuit, namely, the required square wave signal can be obtained by comparing the triangular wave with the sine wave, and the PWM wave signal is realized by using the hardware circuit, so that the burden of a singlechip is reduced.

The inverter module 7 adopts a full-bridge DC-AC converter, two switches which are opposite to each other in the full-bridge circuit are simultaneously switched on, and an upper switch and a lower switch of the same half-bridge are alternately switched on, so that a direct current voltage is converted into an alternating current voltage with the amplitude of an input voltage, and the alternating current voltage is applied to the primary side of the transformer. The supply voltage of the full bridge may be half lower than the supply voltage of the half bridge when obtaining the same output voltage.

Because the system needs to measure voltage and current parameters, and the existing measuring chip can not measure large current and high voltage, the two quantities need to be sampled. And sampling the voltage and the current by adopting a mutual inductor. On one hand, the mutual inductor can sample the current parameters to reduce the change of the original circuit characteristics to the maximum extent; on the other hand, the mutual inductor has a certain isolation effect and is beneficial to independently processing a post-stage circuit.

The display and keyboard module adopts a nixie tube, and has the advantages of low power consumption, low voltage, long service life, aging resistance, sun protection, moisture protection, high temperature protection, low requirement on external environment, easiness in maintenance and the like, so that a display part uses a four-digit nixie tube (LED) for display. The keyboard part adopts a keyboard control chip CH 452.

The temperature measuring module adopts DS18B20 as a temperature sensor, the digital temperature output of DS18B20 is in a unique single-wire interface mode through a one-wire bus, and the two-way communication between the microprocessor and the DS18B20 can be realized only by one port line when the DS18B20 is connected with the single chip microcomputer. The temperature measurement device has great improvement on temperature measurement precision, conversion time, transmission distance, resolution ratio and the like compared with other temperature sensors, brings more convenient use and more satisfactory effect to users, and the DS18B20 directly outputs digital temperature values without correction and is easy to realize.

The inverter circuit adopts full-bridge inversion, the output voltage is 36V, the power is 200W, the field effect transistor PHM0201 is selected, a freewheeling diode is added between a source electrode and a drain electrode for protecting the field effect transistor, a driving resistor is added on a grid electrode, and 1 and 4 paths, 2 and 3 paths are respectively conducted under the control of the driving circuit for enabling an output waveform to be smoother, so that the inversion is realized.

The drive circuit is formed by adopting triodes in the prior art. In order to ensure safe conduction and disconnection of the field effect transistors, provide independent power supplies for all the paths of field effect transistors and provide positive and negative 10V voltages for the grid electrodes, the NPN type triodes and the PNP type triodes are conducted in turn, and in order to avoid interference signals generated in the inversion process from interfering with sampling of the single chip microcomputer, the isolation is carried out by the optocoupler TLP 250.

And a PWM wave generation circuit for generating a PWM wave by the triangular wave and the reference sine wave after passing through the comparison circuit. 19.6KHz square waves generated by the 555 timer pass through the frequency dividing circuit, triangular waves generated by 9.6KHz square waves through TL072 and reference sine waves with adjustable output amplitude are compared to generate PWM waves, the control on PWM can be realized, the control on PWM waveforms is realized, the utilization rate of direct current voltage is high, dead zones are reduced, the interference of harmonic components is reduced, the waveforms of the waveforms after inversion and after filtering and boosting are smoother, and the generation of positive sine waves is realized by adopting the circuit in the prior art.

Voltage and current sampling and protecting module 3, alternating voltage sampling: the voltage transformer samples the output alternating voltage, and the sampling is transmitted to the singlechip for voltage processing through the signal processing circuit; sampling of alternating current: the current transformer samples the output current of the inverter, and the sampled signal is transmitted to the singlechip for voltage processing through the signal processing circuit; direct-current voltage sampling: the direct current input voltage is subjected to voltage division and sampling, and a sampling signal passes through a signal processing circuit and is transmitted to a single chip microcomputer for voltage processing; direct current sampling: the direct current is sampled by adopting an induction micro-current series resistor boosting mode, and a sampling signal is transmitted to the singlechip for voltage processing through a signal processing circuit; all sampling signals are sent to a main control single chip microcomputer for A/D conversion, after being analyzed and processed by the single chip microcomputer, the sampling signals respectively display voltage, current and power, and the working state of the circuit is judged for real-time protection. Overheat protection: the temperature of the inverter circuit is sampled by a temperature sensor DS18B20, and real-time protection is performed when the inverter has an overheating fault.

The keyboard and display module, the keyboard display part adopts the drive of the nixie tube and keyboard control chip CH452, can scan the display automatically, can discern the key number pressed on the keyboard, so can replace CPU to finish the control to keyboard and display, thus has lightened CPU's burden. CH452 can exchange data with the singlechip through an economical 2-wire serial interface, and the resource occupation of an I/O port is effectively reduced. The CH452 has a latching function, so that the singlechip can conveniently control the display of the digital code without continuously outputting display data, the defect that the dynamic display occupies longer CPU time is effectively overcome, and the CH452 and PIC16F876 series interfaces are convenient. CH452 adopts dynamic scanning drive to the nixie tube, and when one pin sucks current, the other pins do not suck current. And supporting the scanning limit, and only distributing scanning time for the effective nixie tube. CH452 periodically inserts a keyboard scan during the display drive scan.

The control part of the single chip microcomputer is realized by software, the single chip microcomputer adopts PIC16F876, and the single chip microcomputer has the advantages of low cost, high speed, low power consumption, small size, strong anti-interference performance and the like, and an A/D conversion performance module is arranged in the PIC16F876, so that the PIC16F876 is used as a control chip to sample and protect an inverter circuit in real time. The method mainly realizes real-time sampling of input and output current voltage, power, efficiency and temperature of the inverter circuit, and completes protection of faults such as overheating and undervoltage.

A simple inverter power supply comprises a simple inverter power supply system.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Although the present invention has been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without inventive work are still within the scope of the present invention.

Claims (10)

1. The simple inverter power supply system is characterized by comprising a main control module, wherein the main control module is connected with a temperature sampling module, a protection module, a keyboard display module, a voltage and current sampling module and a driving module, the driving module is connected with an inverter module, the inverter module is connected with the voltage and current sampling module, the driving module is further connected with a PWM wave generation module, and the PWM wave generation module is connected with a triangular wave generation module and a sine wave generation module.

2. The simple inverter power supply system according to claim 1, wherein the main control module adopts a PIC16F876 single chip microcomputer.

3. The simplified inverter power system of claim 1, wherein the inverter module employs a full bridge DC-AC converter.

4. The simple inverter power supply system according to claim 1, wherein the voltage and current sampling module employs a transformer.

5. The simple inverter power supply system as claimed in claim 1, wherein the keyboard display module employs a four-digit nixie tube and a keyboard control chip CH 452.

6. The simple inverter power supply system as claimed in claim 1, wherein the temperature sampling module employs a DS18B20 temperature sensor.

7. The simple inverter power supply system according to claim 2, wherein the PIC16F876 singlechip is internally provided with an A/D conversion module.

8. The simplified inverter power supply system according to claim 1, wherein the driving module comprises a transistor.

9. The simple inverter power supply system according to claim 1, wherein the protection module is connected with a buzzer.

10. A simple inverter power supply comprising the simple inverter power supply system according to any one of claims 1 to 9.

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