Voltage-current conversion and voltage-voltage conversion dual-function circuit

Abstract

The utility model relates to a voltage-current conversion and voltage-voltage conversion dual-function circuit, which is characterized in that a voltage input signal Vin is connected to the positive input end of an operational amplifier U1, the output end of the operational amplifier U1 is connected with a resistor R1 in series and then connected to the base electrode of a triode Q2, and the collector electrode of the triode Q2 is connected with the positive input end of an operational amplifier U2; a collector electrode of the triode Q2 is connected in series with a resistor R6 and then is connected to a positive end of a power supply, an emitter electrode of the triode Q2 is connected in series with resistors R3, R4 and R5 and then is grounded, a collector electrode of the triode Q1 is connected to a first switching end of the change-over switch S1, a second switching end of the change-over switch S1 is connected between the resistors R4 and R5, and a common end of the change-over switch S1 is led out to serve as a signal output end. The change-over switch S1 is switched between the first switching end and the second switching end, so that switching between a voltage-current conversion function and a voltage-voltage conversion function can be realized.

Description

Technical Field

[0001] This utility model relates to the field of signal conversion technology, and in particular to a voltage-current conversion and voltage-voltage conversion dual-function circuit. Background Technology

[0002] Conventional signal conversion circuits can only output a single signal, either current or voltage. In actual circuits, it is often necessary to select between current and voltage as needed. This selection requires different circuits, which involves many components, high cost, and inconvenient operation. Therefore, a dual-function circuit for voltage-to-current conversion and voltage-to-voltage conversion is needed. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a dual-function circuit for voltage-to-current conversion and voltage-to-voltage conversion.

[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a voltage-current conversion and voltage-voltage conversion dual-function circuit, wherein the voltage input signal Vin is connected to the positive input terminal of the operational amplifier U1, the output terminal of the operational amplifier U1 is connected to the base of the transistor Q2 after series resistor R1, the collector of the transistor Q2 is connected to the positive input terminal of the operational amplifier U2, the collector of the transistor Q2 is connected to the positive power supply after series resistor R6, the emitter of the transistor Q2 is connected to ground after series resistors R3, R4, and R5, and a series resistor R2 is connected between the negative input terminal of the operational amplifier U1 and the emitter of the transistor Q2.

[0005] The negative input terminal of operational amplifier U2 is connected to the positive terminal of the power supply after series resistor R7. The negative input terminal of operational amplifier U2 is connected to the emitter of transistor Q1. The collector of transistor Q1 is connected to ground after series resistor R9. The output terminal of operational amplifier U1 is connected to the base of transistor Q1 after series resistor R8.

[0006] The collector of transistor Q1 is connected to the first switching terminal of switch S1, the second switching terminal of switch S1 is connected between resistors R4 and R5, and the common terminal of switch S1 is led out as the signal output terminal.

[0007] Preferably, the voltage-to-current conversion and voltage-to-voltage conversion dual-function circuit includes a filter capacitor C1, which is connected in parallel with resistors R3 and R4.

[0008] Preferably, the voltage at the positive terminal of the power supply is 15V.

[0009] Preferably, when the common terminal of the switch S1 is connected to the first switching terminal, the signal output terminal serves as the current output signal I. outWhen the common terminal of switch S1 is connected to the second switching terminal, the signal output terminal outputs a voltage signal V. out .

[0010] The beneficial effects of this utility model are: the voltage-current conversion and voltage-voltage conversion dual-function circuit of this utility model can switch between voltage-current conversion function and voltage-voltage conversion function by switching between the first switching terminal and the second switching terminal through the switching switch S1. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the voltage-to-current conversion and voltage-to-voltage conversion dual-function circuit of this utility model. Detailed Implementation

[0012] The present invention will now be described in further detail with reference to the accompanying drawings and preferred embodiments. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0013] like Figure 1 As shown, a voltage-to-current conversion and voltage-to-voltage conversion dual-function circuit is described. The voltage input signal Vin is connected to the positive input terminal of operational amplifier U1. The output terminal of operational amplifier U1 is connected to the base of transistor Q2 after series resistor R1. The collector of transistor Q2 is connected to the positive input terminal of operational amplifier U2. The collector of transistor Q2 is connected to the positive power supply terminal after series resistor R6. The emitter of transistor Q2 is connected to ground after series resistors R3, R4, and R5. The negative input terminal of operational amplifier U1 is connected to the emitter of transistor Q2 after series resistor R2.

[0014] The negative input terminal of operational amplifier U2 is connected to the positive terminal of the power supply after series resistor R7. The negative input terminal of operational amplifier U2 is connected to the emitter of transistor Q1. The collector of transistor Q1 is connected to ground after series resistor R9. The output terminal of operational amplifier U1 is connected to the base of transistor Q1 after series resistor R8.

[0015] The collector of transistor Q1 is connected to the first switching terminal of switch S1, the second switching terminal of switch S1 is connected between resistors R4 and R5, and the common terminal of switch S1 is led out as the signal output terminal.

[0016] Specifically, in one optional embodiment, the voltage-to-current conversion and voltage-to-voltage conversion dual-function circuit includes a filter capacitor C1, which is connected in parallel with resistors R3 and R4.

[0017] In the voltage-to-current conversion and voltage-to-voltage conversion dual-function circuit of this utility model, transistor Q1, operational amplifier U1, transistor Q2, and operational amplifier U2 are mainly used for the conversion of voltage to current. When the common terminal of the switch S1 is connected to the first switching terminal, the signal output terminal serves as the current output signal I. out Based on the virtual short and virtual open characteristics of the operational amplifier, the voltage input signal V... in Converted into the corresponding current output signal I out Current output signal I out With voltage input signal V in A proportional relationship is established. A resistor R2 is connected in series between the negative input terminal of operational amplifier U1 and the emitter of transistor Q2. The resistor R2 forms feedback, which allows for more precise control of the output current, maintaining a stable conversion relationship with the input voltage.

[0018] When the common terminal of switch S1 is connected to the second switching terminal, the signal output terminal outputs a voltage signal V. out Based on the voltage transformation requirements, the resistance values ​​of resistors R3, R4, and R5 are set to convert the voltage input signal V. in Converted into the corresponding voltage output signal V out Voltage output signal V out With voltage input signal V in A proportional relationship is established. A filter capacitor C1 is connected in parallel across resistors R3 and R4. After filtering, the output DC voltage becomes relatively smooth, resulting in a more stable voltage output signal V. out .

[0019] The voltage-to-current conversion and voltage-to-voltage conversion dual-function circuit of this invention can switch between voltage-to-current conversion and voltage-to-voltage conversion by switching between the first switching terminal and the second switching terminal using the switching switch S1.

[0020] The above description is only a specific embodiment of the present utility model. Various examples and illustrations do not constitute a limitation on the substantive content of the present utility model. Those skilled in the art can modify or transform the above-described specific embodiments after reading the description without departing from the essence and scope of the utility model.

Claims

1. A dual-function circuit for voltage-to-current conversion and voltage-to-voltage conversion, characterized in that: The voltage input signal Vin is connected to the positive input terminal of operational amplifier U1. The output terminal of operational amplifier U1 is connected to the base of transistor Q2 after series resistor R1. The collector of transistor Q2 is connected to the positive input terminal of operational amplifier U2. The collector of transistor Q2 is connected to the positive power supply terminal after series resistor R6. The emitter of transistor Q2 is connected to ground after series resistors R3, R4, and R5. The negative input terminal of operational amplifier U1 is connected to the emitter of transistor Q2 after series resistor R2. The negative input terminal of operational amplifier U2 is connected to the positive terminal of the power supply after series resistor R7. The negative input terminal of operational amplifier U2 is connected to the emitter of transistor Q1. The collector of transistor Q1 is connected to ground after series resistor R9. The output terminal of operational amplifier U1 is connected to the base of transistor Q1 after series resistor R8. The collector of transistor Q1 is connected to the first switching terminal of switch S1, the second switching terminal of switch S1 is connected between resistors R4 and R5, and the common terminal of switch S1 is led out as the signal output terminal.

2. The voltage-to-current conversion and voltage-to-voltage conversion dual-function circuit according to claim 1, characterized in that: It includes a filter capacitor C1, which is connected in parallel with resistors R3 and R4.

3. The voltage-to-current conversion and voltage-to-voltage conversion dual-function circuit according to claim 1, characterized in that: The voltage at the positive terminal of the power supply is 15V.

4. The voltage-to-current conversion and voltage-to-voltage conversion dual-function circuit according to claim 1, characterized in that: When the common terminal of the switch S1 is connected to the first switching terminal, the signal output terminal outputs a current signal I. out When the common terminal of switch S1 is connected to the second switching terminal, the signal output terminal outputs a voltage signal V. out .

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