CN210351115U

CN210351115U - Switching value acquisition circuit supporting square wave input

Info

Publication number: CN210351115U
Application number: CN201921961859.3U
Authority: CN
Inventors: 徐钧; 王广州
Original assignee: Nanjing Createstar Electric Power Technology Co ltd
Current assignee: Nanjing Createstar Electric Power Technology Co ltd
Priority date: 2019-11-14
Filing date: 2019-11-14
Publication date: 2020-04-17
Anticipated expiration: 2029-11-14

Abstract

The utility model discloses a support switching value acquisition circuit of square wave input relates to switching value acquisition circuit field, for solving current switching value acquisition circuit in the problem that can not use sinusoidal waveform output after the square wave input. The utility model discloses an electric connection's input circuit in proper order, the protection circuit, buffer circuit and output circuit, the protection circuit is used for stabilizing input voltage, the buffer circuit is used for keeping apart the switching value signal of input and output, output circuit includes a square wave response return circuit, the square wave response return circuit is by the third resistance, fourth resistance and second electric capacity are established ties and are constituteed, the input of fourth resistance and buffer circuit's output electric connection, the output of fourth resistance and output circuit's output electric connection, the one end ground connection of third resistance connection second electric capacity. The utility model discloses square wave signal input can be adopted to with being close sine wave signal output, make things convenient for the matching of equipment.

Description

Switching value acquisition circuit supporting square wave input

Technical Field

The utility model relates to a switching value acquisition circuit field specifically is a switching value acquisition circuit who supports square wave input.

Background

The switching value refers to the acquisition and output of discontinuous signals, including remote acquisition and remote output. It has two states, 1 and 0, which is a switching property in digital circuits; the electric power refers to the on and off of a circuit or the on and off of a contact, and a switching value device in the electric power generally realizes the output of a switching value through an internal relay.

In the prior art, the switching value acquisition circuit mainly comprises a signal input unit, a protection unit, an isolation unit and a signal output unit, and is disclosed in the utility model patent with the publication number of CN209046621U entitled "switching value acquisition circuit for photovoltaic box transformer intelligent monitoring device", and the principle is that the input voltage is reduced through the resistance voltage division of the input unit, and after the voltage is stabilized by the protection unit, the voltage signal is transmitted to the isolation unit, and the voltage value is transmitted to the signal output unit and the subsequent circuit by using the optical coupling isolation area in the isolation unit, so as to transmit high level signals or extremely low level signals; the switching value acquisition circuit is commonly used for measurement and control devices, such as photovoltaic box transformer substation measurement and control devices, wind power box transformer substation measurement and control devices and the like.

At present, the switching value acquisition of a measurement and control device is generally alternating current and direct current 220V, the alternating current and direct current are provided by a UPS power supply, the UPS output is 220V when a box becomes to normally work, when an external power supply is disconnected, a UPS output signal is determined by the UPS model, in consideration of cost, the UPS power supply mostly adopts a square wave output type, most measurement and control devices do not support square wave input, the trouble is brought to equipment selection, and the equipment can be normally used only by matching of more parameters, so that a switching value acquisition circuit supporting the square wave input is urgently needed in the market to solve the problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a support switching value acquisition circuit of square wave input to current switching value acquisition circuit who proposes in solving above-mentioned background art is in the problem that can not export with sine waveform with the square wave input back.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a support switching value acquisition circuit of square wave input, includes electric connection's input circuit, protection circuit, buffer circuit and output circuit in proper order, protection circuit is used for stabilizing input voltage, buffer circuit is used for keeping apart the switching value signal of input and output, output circuit includes a square wave response return circuit, square wave response return circuit is established ties in proper order by third resistance, fourth resistance and second electric capacity and constitutes, fourth resistance with third resistance electric connection's one end with buffer circuit's output electric connection, third resistance with second electric capacity electric connection's one end ground connection, fourth resistance with second electric capacity electric connection's one end with output circuit's output electric connection.

Preferably, the input circuit includes a first resistor and a switching value signal input terminal, and one end of the first resistor is electrically connected to the switching value signal input terminal; the protection circuit comprises a second resistor, a first capacitor and a voltage stabilizing diode, wherein the other end of the first resistor is electrically connected with one end of the second resistor, one end of the first capacitor and the negative electrode of the voltage stabilizing diode respectively, the other end of the second resistor and the other end of the first capacitor are electrically connected with the positive electrode of the voltage stabilizing diode, and the positive electrode of the voltage stabilizing diode is grounded; the isolation circuit is an optocoupler, the optocoupler comprises a light emitting diode and a phototriode, the negative electrode of the voltage stabilizing diode is electrically connected with the positive electrode of the light emitting diode, the positive electrode of the voltage stabilizing diode is electrically connected with the negative electrode of the light emitting diode, and the emitting electrode of the phototriode is electrically connected with the input end of the fourth resistor; the output circuit further comprises a power supply, and the power supply is electrically connected with the collector electrode of the phototriode.

Preferably, the resistance value of the third resistor is 5.1 kilo-ohms, the resistance value of the fourth resistor is 1 kilo-ohms, and the capacity of the second capacitor is 0.1 uF.

Preferably, the resistance value of the first resistor is 100 kilo-ohms, the resistance value of the second resistor is 1 kilo-ohms, the capacity of the first capacitor is 0.1uF, and the power supply is direct current 5V.

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

according to the switching value acquisition circuit supporting square wave input, the square wave response loop is arranged in the output circuit, and the square wave output is responded to the output signal close to the sine wave in a resistance-capacitance series connection mode, so that the square wave signal input can be adopted and the output signal close to the sine wave signal output, the matching and the type selection of equipment are facilitated, and the application range of the square wave output type UPS is widened.

Drawings

FIG. 1 is a schematic circuit diagram of a switching value acquisition circuit in the prior art;

FIG. 2 is a schematic circuit diagram of the present invention;

FIG. 3 is a schematic diagram of waveforms of output signals measured by an oscilloscope when a RC series circuit inputs signals with a square wave of 20 Hz in the prior art;

fig. 4 is a schematic diagram of an output signal waveform measured by an oscilloscope when a resistance-capacitance series circuit of the prior art inputs a signal with a 60 hz square wave.

In the figure: r1, a first resistor; r2, a second resistor; r3, third resistor; r4, fourth resistor; c1, a first capacitance; c2, a second capacitor; d1, zener diode; OC and an optical coupler; d2, light emitting diode; q1, phototriode; u and a power supply.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 2, the present invention provides an embodiment: a switching value acquisition circuit supporting square wave input comprises an input circuit, a protection circuit, an isolation circuit and an output circuit which are electrically connected in sequence, wherein the input circuit is used for inputting a switching value voltage signal, the protection circuit is used for stabilizing input voltage, the isolation circuit is used for isolating the switching value signal of an input end and an output end, the output circuit is used for outputting the switching value voltage signal, the output circuit comprises a square wave response loop, the square wave response loop is formed by sequentially connecting a third resistor R3, a fourth resistor R4 and a second capacitor C2 in series, the resistance of the third resistor R3 can be 5.1 kilo ohms, the resistance of the fourth resistor R4 can be 1 kilo ohms, the model of the second capacitor C2 can be 104 patch capacitors, one end of the fourth resistor R4, which is electrically connected with the third resistor R3, is electrically connected with the output end of the isolation circuit, one end of the third resistor R3, which is electrically connected with the second capacitor C2, is grounded, one end of the fourth resistor R4 electrically connected to the second capacitor C2 is electrically connected to the output end of the output circuit.

Further, the input circuit comprises a first resistor R1 and a switching value signal input end, the resistance value of the first resistor R1 can be 100 kilo-ohms, and one end of the first resistor R1 is electrically connected with the switching value signal input end; the protection circuit comprises a second resistor R2, a first capacitor C1 and a voltage-regulator diode D1, the first capacitor C1 can adopt a 104-chip capacitor, the resistance value of the second resistor R2 can adopt 1 kilo-ohm, the model of the voltage-regulator diode D1 can adopt 1N4007, the other end of the first resistor R1 is electrically connected with one end of the second resistor R2, one end of the first capacitor C1 and the cathode of the voltage-regulator diode D1 respectively, the other end of the second resistor R2 and the other end of the first capacitor C1 are electrically connected with the anode of the voltage-regulator diode D1, and the anode of the voltage-regulator diode D1 is grounded; the isolation circuit is an optocoupler OC, the optocoupler OC can be of a TLP521-1 type, the optocoupler OC comprises a light emitting diode D2 and a phototriode Q1, the negative electrode of a voltage stabilizing diode D1 is electrically connected with the positive electrode of the light emitting diode D2, the positive electrode of the voltage stabilizing diode D1 is electrically connected with the negative electrode of the light emitting diode D2, and the emitting electrode of the phototriode Q1 is electrically connected with the input end of a fourth resistor R4; the output circuit further comprises a direct current 5V power supply U, and the power supply U is electrically connected with the collector electrode of the phototriode Q1.

The working principle is as follows: when the switching value acquisition circuit is used, the switching value acquisition circuit is connected to the terminal block, an electric signal of an input square waveform is subjected to voltage division through a first resistor R1 of the input circuit to obtain a low potential, the electric signal is subjected to voltage stabilization through a voltage stabilizing diode D1 of the protection circuit, clutter and alternating current components in a power supply are filtered through a first capacitor C1, an input signal and an output signal are isolated through an optical couple OC of the isolation circuit, the output signal is subjected to a square wave response circuit to enable the square waveform signal to be converted into a waveform close to a sine wave (as shown in figures 3 and 4, the waveform of a commercial power at 50 Hz is between the two and is more biased to a sharp peak), the output end of the output circuit is in telecommunication connection with a driving chip, and the output signal is amplified.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The utility model provides a support switching value acquisition circuit of square wave input, includes electric connection's input circuit, protection circuit, buffer circuit and output circuit in proper order, protection circuit is used for stabilizing input voltage, buffer circuit is used for keeping apart the switching value signal of input and output, its characterized in that: the output circuit comprises a square wave response loop, the square wave response loop is formed by sequentially connecting a third resistor (R3), a fourth resistor (R4) and a second capacitor (C2) in series, the fourth resistor (R4) is electrically connected with one end of the third resistor (R3) and the output end of the isolation circuit, the third resistor (R3) is electrically connected with one end of the second capacitor (C2) and is grounded, and the fourth resistor (R4) is electrically connected with one end of the second capacitor (C2) and is electrically connected with the output end of the output circuit.

2. The switching value acquisition circuit supporting square wave input according to claim 1, wherein: the input circuit comprises a first resistor (R1) and a switching value signal input end, wherein one end of the first resistor (R1) is electrically connected with the switching value signal input end; the protection circuit comprises a second resistor (R2), a first capacitor (C1) and a voltage stabilizing diode (D1), the other end of the first resistor (R1) is electrically connected with one end of the second resistor (R2), one end of the first capacitor (C1) and the cathode of the voltage stabilizing diode (D1) respectively, the other end of the second resistor (R2) and the other end of the first capacitor (C1) are electrically connected with the anode of the voltage stabilizing diode (D1), and the anode of the voltage stabilizing diode (D1) is grounded; the isolation circuit is an Optical Coupler (OC), the Optical Coupler (OC) comprises a light emitting diode (D2) and a phototriode (Q1), the negative electrode of the voltage-regulator diode (D1) is electrically connected with the positive electrode of the light emitting diode (D2), the positive electrode of the voltage-regulator diode (D1) is electrically connected with the negative electrode of the light emitting diode (D2), and the emitting electrode of the phototriode (Q1) is electrically connected with the input end of the fourth resistor (R4); the output circuit further comprises a power supply (U), and the power supply (U) is electrically connected with the collector electrode of the phototriode (Q1).

3. The switching value acquisition circuit supporting square wave input according to claim 1 or 2, wherein: the resistance value of the third resistor (R3) is 5.1 kilo-ohm, the resistance value of the fourth resistor (R4) is 1 kilo-ohm, and the capacity of the second capacitor (C2) is 0.1 uF.

4. The switching value acquisition circuit supporting square wave input according to claim 2, wherein: the resistance value of the first resistor (R1) is 100 kilo-ohms, the resistance value of the second resistor (R2) is 1 kilo-ohms, the capacity of the first capacitor (C1) is 0.1uF, and the power supply (U) is direct current 5V.