Sampling system
By utilizing the transformer winding ratio relationship through the sampling system, the isolation voltage can be sampled proportionally, which solves the problem of increased cost of isolation chips and reduces design cost and device size.
Patent Information
- Application Number
- CN202422471415.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-12
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-10-12
AI Technical Summary
Existing technologies require the use of isolation chips when sampling isolated voltage, which increases design costs and device size.
The system employs an input unit, a transformer, an output circuit, and a sampling circuit. By utilizing the winding ratio of the transformer, the voltage is sent to the MCU processor through a rectification and filtering unit and an output unit, achieving proportional voltage sampling and avoiding the use of isolation chips.
It effectively reduces design costs, simplifies circuit structure, and reduces component size.
Smart Images
Figure CN223599744U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to electronic technical field especially relates to a sampling system. BACKGROUND
[0002] When sampling the isolation voltage, the signal sampled by the resistor must be transmitted by the isolation chip, then enter the resistor voltage division, and finally realize the purpose of sampling the isolation voltage, but the use of the isolation chip increases the design cost and the volume of the device. UTILITY MODEL CONTENT
[0003] The utility model discloses a sampling system to solve the technical problems in the prior art.
[0004] To achieve the above technical purpose, the utility model adopts the technical scheme as follows in the first aspect:
[0005] A sampling system is electrically connected with an MCU processor, and comprises an input unit, a transformer, an output circuit and a sampling circuit. The transformer comprises a primary coil A and a secondary coil B. The primary coil A is electrically connected with the input unit to input a voltage VIN. The secondary coil B is electrically connected with the output circuit and rectified by the output circuit to output a voltage VDD. The voltage VDD is in a same proportional relationship with the voltage VIN. The sampling circuit comprises a rectification filter unit and an output unit which are electrically connected with each other. The rectification filter unit is electrically connected with the secondary coil B and the output circuit respectively. The output unit is electrically connected with the MCU processor. The voltage VDD is rectified by the rectification filter unit to obtain a smooth voltage VIN_M. The output unit delivers the voltage VIN_M to the MCU processor.
[0006] Preferably, the two ends of the primary coil A are a first pin and a second pin of the transformer. The voltage VIN is an input voltage from the first pin to the second pin. The two ends of the secondary coil B are a third pin and a fourth pin of the transformer. The voltage VDD is a variable ratio output voltage from the third pin to the fourth pin.
[0007] Preferably, the output circuit comprises a capacitor C54, a capacitor C100, a resistor R11 and a diode D6. The capacitor C54, the capacitor C100 and the resistor R11 are connected with each other in parallel. The two ends of the capacitor C54 are electrically connected with the third pin and the anode of the diode D6 respectively. The cathode of the diode D6 is electrically connected with the fourth pin and the rectification filter unit respectively. One end of the capacitor C100 is connected with a ground SGND.
[0008] Preferably, the rectification filter unit comprises a capacitor C15, a capacitor C105 and a diode D17, the capacitor C15 and the capacitor C105 are connected in parallel with each other, the positive electrode of the diode D17 is electrically connected with the fourth pin, the negative electrode of the diode D17 is electrically connected with the capacitor C15, and the two ends of the capacitor C105 are respectively electrically connected with the output unit and the ground SGND.
[0009] Compared with the prior art, the utility model has the following beneficial technical effects: adopting the input unit, the transformer, the output circuit and the sampling circuit, using the winding ratio relationship of the transformer, obtaining the output voltage of the secondary coil B after the ratio, rectifying the voltage of the same proportion through the sampling circuit, and sending to the MCU processor to realize the function of sampling of the primary input voltage, without using the isolation chip, effectively reducing the design cost. BRIEF DESCRIPTION OF DRAWINGS
[0010] Figure 1 It is a circuit diagram of the utility model embodiment.
[0011] Corresponding reference signs are used in the drawings, and the same reference signs indicate the same parts throughout the drawings. DETAILED DESCRIPTION
[0012] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.
[0013] In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or component indicated must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.
[0014] In the description of the utility model, it is necessary to explain, unless another explicit provision and limitation, the term "installation", "link", "connection" should do the broad sense understanding, for example, can be fixed connection, also can be connected, or specifically connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two components inside the communication.For ordinary skilled in the art, the above-mentioned terms can be understood by the specific circumstances the specific meaning of the utility model.
[0015] The specific embodiments of the utility model are described in detail below in combination with the drawings.
[0016] As Figure 1 The utility model provides a sampling system, with MCU processor electric connection, this sampling system includes input unit 100, transformer 200, output circuit 300 and sampling circuit 400;Transformer 200 includes primary winding A and secondary winding B, primary winding A is electrically connected with input unit 100 to access voltage VIN, secondary winding B is electrically connected with output circuit 300, and rectifies through output circuit 300 to output voltage VDD, and voltage VDD and voltage VIN are same proportion relationship;Sampling circuit 400 includes rectifier filter unit 401 and output unit 402 that are electrically connected with each other, and rectifier filter unit 401 is electrically connected with secondary winding B and output circuit 300 respectively, and output unit 402 is electrically connected with MCU processor;Among them, voltage VDD rectifies through rectifier filter unit 401 to obtain smooth voltage VIN_M, and output unit 402 sends voltage VIN_M to MCU processor.
[0017] Specifically, in the embodiment, the sampling system is applied to power supply equipment, utilizes the winding ratio relationship of transformer 200, carries out the ratio to the voltage VIN that input unit 100 inputs, and rectifies through output circuit 300 to obtain smooth DC voltage VDD, and powers the latter circuit, another road rectifier filter unit 401 obtains smooth DC voltage VIN_M after filtering, and is sent to MCU processor through output unit 402, realizes voltage sampling, wherein, the voltage change relationship on VIN_M and primary winding A are same, if the voltage on the primary winding A of transformer 200 changes, then the voltage on the secondary winding B of transformer 200 after ratio also changes, and the voltage on VO also changes, and the voltage on VIN_M after rectification filtering also changes, and the voltage of MCU after voltage division of VIN_M also changes, to achieve the purpose of sampling voltage, and then without the use of isolation chip, effectively reduces the design cost.
[0018] Further, two ends of the primary coil A are a first pin and a second pin of the transformer 200, the voltage VIN is an input voltage from the first pin to the second pin, two ends of the secondary coil B are a third pin and a fourth pin of the transformer 200, and the voltage VDD is a variable ratio output voltage from the third pin to the fourth pin.
[0019] Further, the output circuit 300 includes a capacitor C54, a capacitor C100, a resistor R11 and a diode D6, the capacitor C54, the capacitor C100 and the resistor R11 are connected in parallel with each other, two ends of the capacitor C54 are electrically connected with the third pin and a positive electrode of the diode D6 respectively, a negative electrode of the diode D6 is electrically connected with the fourth pin and a rectifier filter unit 401 respectively, and one end of the capacitor C100 is connected with a ground SGND.
[0020] The rectifier filter unit 401 includes a capacitor C15, a capacitor C105 and a diode D17, the capacitor C15 and the capacitor C105 are connected in parallel with each other, a positive electrode of the diode D17 is electrically connected with the fourth pin, a negative electrode of the diode D17 is electrically connected with the capacitor C15, and two ends of the capacitor C105 are electrically connected with an output unit 402 and the ground SGND respectively.
[0021] In the embodiment, the turns ratio of the primary coil A to the secondary coil B is 120:11, the diode D6 and the diode D17 are both BAV21WS, the capacitor C15, the capacitor C105, the capacitor C54 and the capacitor C100 are all 0603B105K101NT, the first pin, the second pin, the third pin and the fourth pin of the transformer 200 are marked as 1-4 in the attached drawings, the input voltage range of the primary coil A of the transformer 200 is 400V-800V, the output voltage VDD is 12Vdc, the peak voltage of the VO point is 36.67Vdc-73.33Vdc, the voltage VIN_M is connected to the MCU processor after being divided by the resistor, and the voltage sampling is realized by sampling of the MCU processor, so that the use of the isolation chip is not needed, and the design cost is effectively reduced. Figure 1
[0022] The above is one or more embodiments provided in combination with specific contents, and the specific implementation of the utility model is not limited to these descriptions. Any approximation, similarity or replacement of the method and structure of the utility model, or any technical deduction or replacement under the concept of the utility model, should be regarded as the protection range of the utility model.
Claims
1. A sampling system, electrically connected with an MCU processor, characterized in that, The input unit (100), the transformer (200), the output circuit (300) and the sampling circuit (400) are included. The transformer (200) includes a primary coil A and a secondary coil B, the primary coil A is electrically connected with the input unit (100) to access the voltage VIN, the secondary coil B is electrically connected with the output circuit (300) and rectified through the output circuit (300) to output the voltage VDD, the voltage VDD is in the same proportional relationship with the voltage VIN. The sampling circuit (400) includes a rectifier filter unit (401) and an output unit (402) electrically connected with each other, the rectifier filter unit (401) is electrically connected with the secondary coil B and the output circuit (300) respectively, and the output unit (402) is electrically connected with the MCU processor. Wherein, the voltage VDD is rectified through the rectifier filter unit (401) to obtain the smooth voltage VIN_M, and the output unit (402) delivers the voltage VIN_M to the MCU processor. The two ends of the primary coil A are the first pin and the second pin of the transformer (200), the voltage VIN is the input voltage from the first pin to the second pin, the two ends of the secondary coil B are the third pin and the fourth pin of the transformer (200), and the voltage VDD is the variable ratio output voltage from the third pin to the fourth pin. The output circuit (300) includes a capacitor C54, a capacitor C100, a resistor R11 and a diode D6, the capacitor C54, the capacitor C100 and the resistor R11 are connected in parallel with each other, the two ends of the capacitor C54 are electrically connected with the third pin and the positive electrode of the diode D6 respectively, the negative electrode of the diode D6 is electrically connected with the fourth pin and the rectifier filter unit (401) respectively, and one end of the capacitor C100 is connected with the ground SGND. The rectifier filter unit (401) includes a capacitor C15, a capacitor C105 and a diode D17, the capacitor C15 and the capacitor C105 are connected in parallel with each other, the positive electrode of the diode D17 is electrically connected with the fourth pin, the negative electrode of the diode D17 is electrically connected with the capacitor C15, and the two ends of the capacitor C105 are electrically connected with the output unit (402) and the ground SGND respectively.