Current and voltage input sampling soft switching circuit on power unit

Abstract

The utility model discloses a current and voltage input sampling soft switching circuit on a power unit, which comprises a sampling unit and a switching unit, the sampling unit is used for adjusting voltage and current sampling values and sending AI-1 signals, and the switching unit is used for receiving the AI-1 signals sent by the sampling unit and switching current and voltage modes. The sampling unit is connected with the switching unit; the sampling unit comprises a current and voltage input AI, the current and voltage input AI is connected with a magnetic bead L1 used for electromagnetic interference suppression and power line filtering, the magnetic bead L1 is sequentially connected with a capacitor C4, a resistor R6 and a resistor R3, the resistor R3 is connected with an operational amplifier U1A in parallel, and the operational amplifier U1A is connected with a capacitor C1 in parallel. The circuit is simple, the number of used components is small, the cost is low, the power consumption of devices selected by the circuit is low, the service life of the power unit can be prolonged, the safety and reliability of the power unit are improved, the trouble of manual switching is omitted, and the error rate of manual hardware switching is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of analog soft switching, and specifically relates to a current and voltage input sampling soft switching circuit on a power unit. Background Technique

[0002] In a power unit, the pressure and speed of the power unit are controlled by analog signals.

[0003] In the prior art, the current and voltage input sampling circuits used in various power units are all switched by hardware. It is necessary to open the cover and manually switch to convert the current type to the voltage type or convert the voltage type to the current type. The possibility of manual switching error is relatively high. For this reason, we propose a current and voltage input sampling soft switching circuit on a power unit to solve the above problems. Summary of the Invention

[0004] The purpose of the utility model is to provide a current and voltage input sampling soft switching circuit on a power unit to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A current and voltage input sampling soft switching circuit on a power unit, including:

[0006] A sampling unit, which is used to adjust the voltage and current sampling values and send out an AI-1 signal;

[0007] A switching unit, which is used to receive the AI-1 signal sent by the sampling unit to switch the current and voltage modes;

[0008] The sampling unit is connected to the switching unit;

[0009] The sampling unit includes a current and voltage input AI. The current and voltage input AI is connected to a magnetic bead L1 for electromagnetic interference suppression and power line filtering. The magnetic bead L1 is sequentially connected to a capacitor C4, a resistor R6, and a resistor R3. The resistor R3 is connected in parallel with an operational amplifier U1A. A capacitor C1 is connected in parallel on the operational amplifier U1A. A resistor R1 is connected in parallel on the capacitor C1. The operational amplifier U1A is connected to a ±15V power supply, a resistor R7, and a resistor R4. The resistor R4 is connected to an operational amplifier U1B. A capacitor C2 is connected in parallel on the operational amplifier U1B. A resistor R2 is connected in parallel on the capacitor C2. The operational amplifier U1B is connected to a ±15V power supply, a resistor R8, and a resistor R5. A switching diode D1 is connected to the connection line between the operational amplifier U1B and the resistor R5. The resistor R5 is connected to a capacitor C3 and a sampling signal ADC.

[0010] Preferably, the switching unit includes a switching signal AI_V / I input by software through current and voltage. The switching signal AI_V / I is connected to a resistor R16. The resistor R16 is connected to a +3.3V power supply. An optocoupler U2 is connected in parallel to the resistor R16. The optocoupler U2 is connected to a resistor R11.

[0011] Preferably, the capacitor C4, resistor R6, resistor R7, resistor R8, and capacitor C3 are respectively grounded. The capacitors C1, C2, and C4 are filtering capacitors.

[0012] Preferably, the resistors R6 and R8 are pull-down resistors. The resistor R5 and capacitor C3 form a filtering circuit. The sampling signal ADC is a signal sampled by current and voltage input.

[0013] Preferably, the resistors R1, R2, R3, and R4 are gain resistors. The resistors R1 and R3 are used to amplify the magnitude of voltage and current adjustment. The resistors R2 and R4 are used to adjust the voltage and current output by U1A.

[0014] Preferably, the cathode of a switching diode D1 is connected to the line between the operational amplifier U1B and the resistor R5. The anode of the switching diode D1 is grounded.

[0015] Preferably, the model of the operational amplifier U1A is SGM8270-2XS8G / TR, and the model of the operational amplifier U1B is SGM8270-2XS8G / TR.

[0016] Preferably, the switching signal AI_V / I is a switching signal input by software through current and voltage. The resistors R13 and R16 are voltage-dividing resistors used to reduce voltage.

[0017] Preferably, the model of the optocoupler U2 is QX172-CuH-S. The voltage-dividing resistors include resistors R11, R12, R13, R14, and R15.

[0018] Preferably, a resistor R12 is connected in parallel to the resistor R11. A resistor R13 is connected in parallel to the resistor R12. A resistor R14 is connected in parallel to the resistor R13. A resistor R15 is connected in parallel to the resistor R14. The resistor R11 is connected to the current and voltage input AI.

[0019] Compared with the prior art, the beneficial effects of the present utility model are:

[0020] 1. The magnitude of the voltage and current sampling values of the dual operational amplifier can be adjusted by modifying the resistance value. The circuit is protected by the switching diode D1, and the optocoupler U2 is controlled by software to achieve the current and voltage switching. The circuit is simple, with fewer components used, lower cost, and lower power consumption of the selected devices, which can extend the service life of the power unit and improve the safety and reliability of the power unit. Switching the current and voltage modes on the power unit is simpler, eliminating the trouble of manual switching and reducing the error rate of manual hardware switching. Brief Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the sampling unit circuit in the present invention;

[0022] Figure 2 It is a schematic diagram of the switching unit circuit in the present invention. Detailed Embodiment

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] Please refer to Figure 1-2 , a current-voltage input sampling soft-switching circuit on a power unit, including: a sampling unit connected to a switching unit;

[0025] Sampling unit, which is used to adjust the voltage and current sampling values and send out the AI-1 signal; the sampling unit includes a current and voltage input AI, the current and voltage input AI is connected to a bead L1 for electromagnetic interference suppression and power line filtering, the bead L1 is successively connected with a capacitor C4, a resistor R6 and a resistor R3, the resistor R3 is connected in parallel with an operational amplifier U1A, a capacitor C1 is connected in parallel on the operational amplifier U1A, a resistor R1 is connected in parallel on the capacitor C1, the operational amplifier U1A is connected with a ±15V power supply, a resistor R7 and a resistor R4, the resistor R4 is connected to an operational amplifier U1B, a capacitor C2 is connected in parallel on the operational amplifier U1B, a resistor R2 is connected in parallel on the capacitor C2, the operational amplifier U1B is connected with a ±15V power supply, a resistor R8 and a resistor R5, a switching diode D1 is connected on the connection line between the operational amplifier U1B and the resistor R5, the resistor R5 is connected to a capacitor C3 and a sampling signal ADC, the capacitors C4, R6, R7, R8 and C3 are respectively grounded, the capacitors C1, C2 and C4 are filtering capacitors, the resistors R6 and R8 are pull-down resistors, the resistor R5 and the capacitor C3 are a filtering circuit, the sampling signal ADC is the signal of the current and voltage input sampling, the resistors R1, R2, R3 and R4 are amplification factor resistors, the resistors R1 and R3 are used to amplify the voltage and current magnitude adjustment, the resistors R2 and R4 are used to adjust the voltage and current output by U1A, the cathode of the switching diode D1 is connected on the connection line between the operational amplifier U1B and the resistor R5, the anode of the switching diode D1 is grounded, the model of the operational amplifier U1A is SGM8270-2XS8G / TR, and the model of the operational amplifier U1B is SGM8270-2XS8G / TR.

[0026] Switching unit, which is used to receive the AI-1 signal sent by the sampling unit to switch the current and voltage modes; the switching unit includes a switching signal AI_V / I input by software through the current and voltage, the switching signal AI_V / I is connected to a resistor R16, the resistor R16 is connected to a +3.3V power supply, an optocoupler U2 is connected in parallel on the said resistor R16, the optocoupler U2 is connected to a resistor R11, the switching signal AI_V / I is the switching signal input by software through the current and voltage, the resistors R13 and R16 are voltage-dividing resistors used to reduce the voltage across this circuit, the model of the optocoupler U2 is QX172-CuH-S, the voltage-dividing resistors include resistors R11, R12, R13, R14 and R15, the resistor R11 is connected in parallel with the resistor R12, the resistor R12 is connected in parallel with the resistor R13, the resistor R13 is connected in parallel with the resistor R14, the resistor R14 is connected in parallel with the resistor R15, and the resistor R11 is connected to the current and voltage input AI.

[0027] By modifying the resistance value and the magnitude of the voltage and current sampling values of the dual operational amplifier, protecting the circuit through the switching diode D1, and controlling the optocoupler U2 through software, the current and voltage can be switched. The circuit is simple, with fewer components used, lower cost, lower power consumption of the selected devices, which can extend the service life of the power unit, improve the safety and reliability of the power unit. Switching the current and voltage modes on the power unit is simpler, eliminating the trouble of manual switching and reducing the error rate of manual hardware switching.

[0028] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A current and voltage input sampling soft switching circuit on a power unit, characterized in that Including: A sampling unit, which is used to adjust the voltage and current sampling values and send out the AI-1 signal; A switching unit, which is used to receive the AI-1 signal sent by the sampling unit to switch the current and voltage modes; The sampling unit is connected to the switching unit; The sampling unit includes a current and voltage input AI, the current and voltage input AI is connected to a bead L1 for electromagnetic interference suppression and power line filtering, the bead L1 is sequentially connected with a capacitor C4, a resistor R6 and a resistor R3, the resistor R3 is connected in parallel with an operational amplifier U1A, a capacitor C1 is connected in parallel on the operational amplifier U1A, a resistor R1 is connected in parallel on the capacitor C1, the operational amplifier U1A is connected with a ±15V power supply, a resistor R7 and a resistor R4, the resistor R4 is connected to an operational amplifier U1B, a capacitor C2 is connected in parallel on the operational amplifier U1B, a resistor R2 is connected in parallel on the capacitor C2, the operational amplifier U1B is connected with a ±15V power supply, a resistor R8 and a resistor R5, a switching diode D1 is connected to the connection line between the operational amplifier U1B and the resistor R5, and the resistor R5 is connected to a capacitor C3 and a sampling signal ADC.

2. The current-voltage input sampling soft switching circuit on the power unit according to claim 1, characterized in that: The switching unit includes a switching signal AI_V / I input by software through current and voltage, the switching signal AI_V / I is connected to a resistor R16, the resistor R16 is connected to a +3.3V power supply, an optocoupler U2 is connected in parallel on the resistor R16, and the optocoupler U2 is connected to a resistor R11.

3. The current-voltage input sampling soft switching circuit on the power unit according to claim 1, characterized in that: The capacitor C4, the resistor R6, the resistor R7, the resistor R8 and the capacitor C3 are respectively grounded, and the capacitors C1, C2 and C4 are filter capacitors.

4. The current and voltage input sampling soft switching circuit on the power unit according to claim 1, characterized in that: The resistor R6 and the resistor R8 are pull-down resistors, the resistor R5 and the capacitor C3 are a filter circuit, and the sampling signal ADC is a signal for sampling the current and voltage input.

5. The current and voltage input sampling soft switching circuit on the power unit according to claim 1, characterized in that: The resistors R1, R2, R3 and R4 are amplification factor resistors. The resistors R1 and R3 are used to amplify the voltage and current magnitudes for adjustment, and the resistors R2 and R4 are used to adjust the voltage and current output by U1A.

6. The current-voltage input sampling soft switching circuit on the power unit according to claim 1, characterized in that: The cathode of a switching diode D1 is connected to the connection line between the operational amplifier U1B and the resistor R5, and the anode of the switching diode D1 is grounded.

7. The current-voltage input sampling soft switching circuit on the power unit according to claim 1, characterized in that: The model of the operational amplifier U1A is SGM8270-2XS8G / TR, and the model of the operational amplifier U1B is SGM8270-2XS8G / TR.

8. The current-voltage input sampling soft switching circuit on the power unit according to claim 2, characterized in that: The switching signal AI_V / I is a switching signal input by software through current and voltage, and the resistors R13 and R16 are voltage-dividing resistors used to reduce the voltage.

9. The current-voltage input sampling soft-switching circuit on the power unit according to claim 8, characterized in that: The model of the optocoupler U2 is QX172-CuH-S, and the voltage-dividing resistors include resistors R11, R12, R13, R14 and R15.

10. The current and voltage input sampling soft switching circuit on the power unit according to claim 9, characterized in that: A resistor R12 is connected in parallel on the resistor R11, a resistor R13 is connected in parallel on the resistor R12, a resistor R14 is connected in parallel on the resistor R13, a resistor R15 is connected in parallel on the resistor R14, and the resistor R11 is connected to the current and voltage input AI.

Images