CN212726986U

CN212726986U - Positive and negative logic level conversion circuit

Info

Publication number: CN212726986U
Application number: CN202021723595.0U
Authority: CN
Inventors: 李柯烨; 李爱夫; 胡封林
Original assignee: Hunan Central Core Valley Technology Co ltd
Current assignee: Hunan Central Core Valley Technology Co ltd
Priority date: 2020-08-18
Filing date: 2020-08-18
Publication date: 2021-03-16
Anticipated expiration: 2030-08-18

Abstract

The utility model discloses a positive negative logic level conversion circuit, its technical scheme is: including the VCC power, VCC power output end electric connection has first triode, first triode output end electric connection has first resistance, first resistance output end electric connection has active power filter, active power filter output end electric connection has the second triode, second triode output end electric connection has the second resistance, and a positive and negative logic level switching circuit beneficial effect is: through setting up converting circuit, in the operation of reality, RS 232's RXD end is RS-232 level signal receiving terminal, and RS 232's TXD end is RS-232 level signal sending terminal, and convenient to use is swift, and the running cost is lower, and the electrical components that use and relate to all comparatively common acquire easily, and low in manufacturing cost is convenient for mass production, and this circuit structural design is novel simultaneously, and is simple uncomplicated to applicable to in other communication types, it is high to use the flexibility.

Description

Positive and negative logic level conversion circuit

Technical Field

The utility model relates to a circuit design technical field, concretely relates to positive and negative logic level conversion circuit.

Background

Circuit conversion is a means of simplifying circuit computation. It changes a part of a given circuit into a new circuit with different connection modes (topological structures) and different parameter values of the contained elements under certain conditions, and the connection mode of circuit conversion is mostly simpler, even if not simpler, it can also provide certain convenience for calculation. The most common circuit transformation seen is the equivalent transformation. The voltage and current in the non-conversion part of the circuit can be ensured to be unchanged in conversion.

With the continuous development of electronic technology and the increasing number of electronic devices, information interaction between the devices is also increasingly frequent, and the requirements on the interface technology of the electronic devices are also increasingly high. Various types of interfaces, such as USB interfaces, serial interfaces, RS232 interfaces, RS485 interfaces, SPI interfaces, and the like, are available on the market. The RS232 interface is one of the personal computer communication interfaces, and most of the electronic equipment is also reserved with asynchronous serial ports, and the two are communicated based on an asynchronous serial port protocol, so the interface mode can be used for interactive communication between the personal computer and the electronic equipment, thereby completing operations such as downloading, debugging, data uploading and the like.

At present, in the prior art, the traditional conversion circuit has a complex structure, and used electrical components contain more expensive components, so that the manufacturing cost is higher and the application range is limited.

Therefore, it is necessary to develop a positive-negative logic level conversion circuit.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model provides a positive negative logic level shift circuit, through setting up converting circuit, in the actual operation, RS 232's RXD end is RS-232 level signal receiving terminal, RS 232's TXD end is RS-232 level signal transmitting terminal, high durability and convenient use is swift, the running cost is lower, the electric elements that use to relate to all comparatively common acquire easily, the cost of manufacture is cheap, be convenient for mass production, this circuit structure design is novel simultaneously, it is simple uncomplicated, and applicable to among other communication types, the use flexibility is high, it is complicated to solve traditional converting circuit structure among the prior art, the electric elements that use contains more expensive component, manufacturing cost is higher and the limited problem of application scope.

In order to achieve the above object, the present invention provides the following technical solutions: the utility model provides a positive negative logic level transfer circuit, includes the VCC power, VCC power output electric connection has first triode, first triode output electric connection has first resistance, first resistance output electric connection has active power filter, active power filter output electric connection has the second triode, second triode output electric connection has the second resistance, second resistance output and first triode input electric connection, the last parallel connection of second resistance has third resistance and USART interface, third resistance input electric connection has the fourth resistance, fourth resistance input and first triode electric connection.

Preferably, the USART interface TXD terminal is electrically connected to the third resistor, and the USART interface RXD terminal is electrically connected to the second triode.

Preferably, an RS323 interface is arranged between the first triode and the first resistor, the RS323 interface RXD end is electrically connected with the output end of the first triode, and the RS323 interface TXD end is electrically connected with the input end of the first resistor.

Preferably, the active power filter is connected in parallel with a first diode, a fifth resistor and a second diode, the input end of the first diode is electrically connected with the output end of the first resistor, the output end of the first diode is electrically connected with the fifth resistor, and the output end of the fifth resistor is electrically connected with the second triode and the second diode.

Preferably, the output end of the second diode is connected to the ground wire.

Preferably, an energy storage capacitor is connected in parallel to the active power filter.

The utility model has the advantages that:

the utility model discloses a setting is by first triode, the second triode, first diode, the second diode, first resistance, the second resistance, the converting circuit that electric components such as third resistance and active power filter constitute, in the actual function, RS 232's RXD end is RS-232 level signal receiving terminal, RS 232's TXD end is RS-232 level signal transmitting terminal, convenient to use is swift, the operation cost is lower, the electric components that the use relates to all comparatively common acquire easily, low in manufacturing cost, the mass production of being convenient for, this circuit structure design is novel simultaneously, and is simple uncomplicated, and applicable to in other communication types, it is high to use the flexibility.

Drawings

Fig. 1 is a circuit diagram provided by the present invention;

in the figure: the circuit comprises a 1VCC power supply, a 2 first triode, a 3 first resistor, a 4 active power filter, a 5 second triode, a 6 second resistor, a 7 third resistor, a 8USART interface, a 9 fourth resistor, a 10RS323 interface, a 11 first diode, a 12 fifth resistor, a 13 second diode and a 14 energy storage capacitor.

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.

Referring to the attached drawing 1, the utility model provides a positive and negative logic level switching circuit, including VCC power 1, VCC power 1 output end electric connection has first triode 2, the triode, the full name should be semiconductor triode, also called bipolar transistor, crystal triode, is a semiconductor device of control current, its effect is to amplify weak signal into electric signal with bigger amplitude value, also used as contactless switch, the triode is one of semiconductor basic components and parts, has current amplification effect, is the core component of electronic circuit, the triode is to make two PN junctions very close to each other on a semiconductor substrate, two PN junctions divide the whole semiconductor into three parts, the middle part is the base region, the both sides part is emitter region and collector region, the arrangement mode has two kinds of PNP and NPN, the first triode 2 output end electric connection has first resistance 3, the output end of the first resistor 3 is electrically connected with an active power filter 4, the active power filter 4 is a novel power electronic device for dynamically inhibiting harmonic waves and compensating reactive power, can quickly track and compensate harmonic waves with different sizes and frequencies, is called as active, is only capable of passively absorbing harmonic waves with fixed frequency and size relative to a passive LC filter, APF can sample load current and carry out separation of each harmonic wave and reactive power, control and actively output the size, frequency and phase of the current, and quickly respond to offset corresponding current in the load, thereby realizing dynamic tracking compensation and compensating both harmonic waves and reactive power and unbalance, the output end of the active power filter 4 is electrically connected with a second triode 5, the output end of the second triode 5 is electrically connected with a second resistor 6, the output end of the second resistor 6 is electrically connected with the input end of the first triode 2, the second resistor 6 is connected with a third resistor 7 and a USART interface 8 in parallel, the input end of the third resistor 7 is electrically connected with a fourth resistor 9, and the input end of the fourth resistor 9 is electrically connected with the first triode 2;

further, the USART interface 8TXD end is electrically connected to the third resistor 7, the USART interface 8RXD end is electrically connected to the second triode 5, the USART interface 8 is a universal synchronous/asynchronous serial receiver/transmitter, the USART is a full-duplex universal synchronous/asynchronous serial transceiver module, and the interface is a highly flexible serial communication device;

further, an RS323 interface 10 is arranged between the first triode 2 and the first resistor 3, an RXD end of the RS323 interface 10 is electrically connected with an output end of the first triode 2, a TXD end of the RS323 interface 10 is electrically connected with an input end of the first resistor 3, an output end of the RS323 interface 10 is connected to a ground wire, the RS232 interface is a serial port, a 9-core socket at the rear of the computer case is used as a standard communication port by a plurality of industrial instruments, and data transmission between the computer and the computer or between the computer and the terminal can adopt two modes of serial communication and parallel communication. Because the serial communication mode has few used lines and low cost, the method avoids the inconsistency of the characteristics of a plurality of lines and is widely adopted particularly in remote transmission, and requires that two communication parties adopt a standard interface during serial communication, so that different devices can be conveniently connected for communication;

further, a first diode 11, a fifth resistor 12 and a second diode 13 are connected in parallel to the active power filter 4, an input end of the first diode 11 is electrically connected with an output end of the first resistor 3, an output end of the first diode 11 is electrically connected with the fifth resistor 12, and an output end of the fifth resistor 12 is electrically connected with the second triode 5 and the second diode 13;

furthermore, the output end of the second diode 13 is connected to the ground, and the diode is an electronic device made of semiconductor materials (silicon, selenium, germanium and the like). It has one-way conducting performance, that is, when positive voltage is applied to the anode and cathode of the diode, the diode is conducted. When a reverse voltage is applied to the anode and the cathode, the diode is turned off. Therefore, the on and off of the diode is equivalent to the on and off of the switch;

further, the active power filter 4 is provided with an energy storage capacitor 14 in parallel, the capacitor is two conductors close to each other, and a layer of non-conductive insulating medium is sandwiched between the two conductors, so that the capacitor is formed. When a voltage is applied across the two plates of the capacitor, the capacitor stores charge. The capacitance of the capacitor is numerically equal to the ratio of the amount of charge on one conductive plate to the voltage between the two plates.

The utility model discloses a use as follows: when the utility model is used, the water-saving device,

the RXD end of the RS232 is an RS-232 level signal receiving end, the TXD end of the RS232 is an RS-232 level signal sending end, the TXD end of the RS232 is always kept between-3V and-15V when no data communication exists, and the voltage at the joint of the first diode 11 and the active power filter 4 is also kept between-3V and-15V due to the action of the first diode 11 and the active power filter 4. The VCC power supply 1 should be +5V, TXD of USART is connected with the single chip microcomputer TXD, RXD of USART is connected with the single chip microcomputer RXD, when TXD of USART is '0', the first triode 2 is conducted, RXD voltage of RS232 is about +5V, the voltage is between +3 to +15V, and according to RS232 level, it is '0'; when TXD of USART is '1', the first triode 2 is cut off, and from 1, the TXD of USART should be '1' for keeping RS232 level logic, if RS232 is converted into CMOS level, when TXD of RS232 is '1', namely-3 to-15V, the second triode 5 is cut off, RXD voltage of USART is about 5V and is '1'; when TXD of RS232 is "0", the first transistor 2 is turned on, the voltage is 0, and the level is "0".

The above description is only a preferred embodiment of the present invention, and any person skilled in the art may modify the present invention or modify it into an equivalent technical solution by using the technical solutions described above. Therefore, any simple modifications or equivalent replacements made according to the technical solution of the present invention belong to the scope of the claimed invention as far as possible.

Claims

1. A positive-negative logic level conversion circuit comprising a VCC power supply (1), characterized in that: VCC power (1) output electric connection has first triode (2), first triode (2) output electric connection has first resistance (3), first resistance (3) output electric connection has active power filter (4), active power filter (4) output electric connection has second triode (5), second triode (5) output electric connection has second resistance (6), second resistance (6) output and first triode (2) input electric connection, it has third resistance (7) and USART interface (8) to go up the parallel connection on second resistance (6), third resistance (7) input electric connection has fourth resistance (9), fourth resistance (9) input and first triode (2) electric connection.

2. The positive-negative logic level shifting circuit of claim 1, wherein: the USART interface (8) TXD end is electrically connected with the third resistor (7), and the USART interface (8) RXD end is electrically connected with the second triode (5).

3. The positive-negative logic level shifting circuit of claim 1, wherein: an RS323 interface (10) is arranged between the first triode (2) and the first resistor (3), an RXD end of the RS323 interface (10) is electrically connected with an output end of the first triode (2), a TXD end of the RS323 interface (10) is electrically connected with an input end of the first resistor (3), and an output end of the RS323 interface (10) is connected with a ground wire.

4. The positive-negative logic level shifting circuit of claim 1, wherein: active power filter (4) are gone up the parallel connection and have first diode (11), fifth resistance (12) and second diode (13), first diode (11) input and first resistance (3) output electric connection, first diode (11) output and fifth resistance (12) electric connection, fifth resistance (12) output and second triode (5) and second diode (13) electric connection.

5. The positive-negative logic level shifting circuit of claim 4, wherein: the output end of the second diode (13) is connected with the ground wire.

6. The positive-negative logic level shifting circuit of claim 1, wherein: and an energy storage capacitor (14) is arranged on the active power filter (4) in parallel.