Alternating current sampling circuit
By designing an AC sampling circuit including an operational amplifier, a voltage lift circuit and a voltage follow circuit, the complex and cost-effective sampling circuit in the prior art is solved, and the effect of simplifying the structure and reducing costs is achieved.
CN222638522UActive Publication Date: 2025-03-18CHONGQING CHUANYI AUTOMATION CO LTD
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Patent Information
- Application Number
- CN202421228880.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-31
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-05-31
AI Technical Summary
Technical Problem
Existing AC sampling circuits require two op amps, resulting in complex circuits, high cost, and difficulty in directly outputting voltage to analog-to-digital converters.
Method used
An alternating sampling circuit is designed, through an operational amplifier, voltage lift circuit and voltage follow circuit, the circuit structure composed of magnetic beads, resistors and capacitors is used to reduce the cost of the sampling circuit and ensure that the minimum value of the output voltage is greater than 0.
Benefits of technology
The circuit structure is simplified, the use of operational amplifiers and related circuit components is reduced, production costs are reduced, and sampling accuracy and output voltage are guaranteed.
✦ Generated by Eureka AI based on patent content.
Abstract
An alternating current sampling circuit comprises alternating current to be sampled, a current or voltage conversion circuit, a voltage lifting circuit and a voltage follower circuit, the voltage lifting circuit is composed of a magnetic bead, a second resistor, a third resistor and a first capacitor, one end of the magnetic bead is connected with a first output pin of the conversion circuit, and the other end of the magnetic bead is connected with one end of the second resistor. The other end of the second resistor is connected with direct current bias voltage through a third resistor and grounded through a first capacitor, the voltage follower circuit is composed of an operational amplifier, a second capacitor and a fourth resistor, and the other end of the second resistor is connected with a positive input pin of the operational amplifier. A reverse input pin of the operational amplifier is connected with an output pin of the operational amplifier, a voltage pin of the operational amplifier is connected with power supply voltage and is grounded through a second capacitor, a grounding pin of the operational amplifier is grounded, and an output pin of the operational amplifier is connected with a fourth resistor to adjust input impedance. And the output voltage is input into the analog-to-digital converter.
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