Simple voltage and current detection circuit
By designing a simple voltage and current detection circuit, and using a power supply, voltage divider circuit, and main control chip to analyze voltage and current signals, the high cost of voltage and current detection circuits is solved, replacing dedicated sensor chips, thus achieving cost reduction and improved stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- EMDOOR CHINESE ACAD OF SCI CO LTD
- Filing Date
- 2025-04-16
- Publication Date
- 2026-05-15
AI Technical Summary
In the existing technology, voltage and current detection circuits use dedicated voltage and current detection sensor chips, resulting in high costs and affecting the market competitiveness of electronic devices.
Design a simple voltage and current detection circuit, including a power supply, a first voltage divider circuit, a second voltage divider circuit, a voltage and current analysis main control circuit, and a load device. Through a precision resistor R1 and a main control chip U1, the voltage and current signals are analyzed, replacing the dedicated voltage and current detection sensor chip.
It achieves cost reduction, improved stability and flexibility, and is suitable for electronic devices with various complex circuits, simplifying circuit structure and reducing failure rate.
Smart Images
Figure CN224247803U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of detection circuit technology, specifically to a simple voltage and current detection circuit. Background Technology
[0002] Voltage and current sensing circuits are an indispensable part of electronic equipment, mainly used to monitor the voltage and current levels in the circuit, thereby ensuring the stable operation and safety of the electronic equipment. Voltage and current sensing circuits are commonly found in various electronic equipment fields such as high-voltage protection, DC-DC converters, and electrostatic discharge protection.
[0003] Especially for electronic devices with complex circuits, it is often necessary to monitor the voltage and current output of the system power supply to ensure stable operation and troubleshooting. In existing technology, dedicated voltage and current sensor chips are typically installed in the circuit to monitor these output voltages and currents. However, this approach is hampered by the generally high cost of these dedicated sensors, which increases the production cost of electronic devices requiring voltage and current monitoring circuits, thereby reducing their market competitiveness. Utility Model Content
[0004] To address the problems in the prior art, this utility model provides a simple voltage and current detection circuit. By setting up a power supply, a first voltage divider circuit, a second voltage divider circuit, a voltage and current analysis main control circuit, and a load device in a simple voltage and current detection circuit, and with a precision resistor R1 between the power supply and the load device, this simple voltage and current detection circuit can replace the dedicated voltage and current detection sensor chip, reducing costs and improving stability. This solves the problem of high costs caused by the use of dedicated voltage and current detection sensor chips in the prior art.
[0005] This utility model provides a simple voltage and current detection circuit, including a power supply, a first voltage divider circuit, a second voltage divider circuit, a voltage and current analysis main control circuit, and a load device. The output terminal of the power supply is connected to the load device. A precision resistor R1 is also provided between the power supply and the load device. The input terminal of the first voltage divider circuit is connected to one end of the precision resistor R1 and the output terminal of the power supply. The output terminal of the first voltage divider circuit is connected to the input terminal of the voltage and current analysis main control circuit. The input terminal of the second voltage divider circuit is connected to the other end of the precision resistor R1 and the input terminal of the load device. The output terminal of the second voltage divider circuit is connected to the input terminal of the voltage and current analysis main control circuit. The voltage and current analysis main control circuit can receive the voltage signals input from the first voltage divider circuit and the second voltage divider circuit and analyze the voltage across the precision resistor R1 and the current of the load device.
[0006] In a further improvement of this utility model, the voltage and current analysis main control circuit is provided with a main control chip U1, which has 64 pins. The 58th pin of the main control chip U1 is connected to the output terminal of the first voltage divider circuit, and the 56th pin of the main control chip U1 is connected to the output terminal of the second voltage divider circuit.
[0007] This utility model is further improved by including a crystal oscillator Y1, a resistor R6, a capacitor C2, and a capacitor C4 in the voltage and current analysis main control circuit. The crystal oscillator Y1 has four pins. The first pin of the crystal oscillator Y1 is connected to one end of the resistor R6, one end of the capacitor C4, and the fifth pin of the main control chip U1. The fourth pin of the crystal oscillator Y1 is connected to the other end of the resistor R6, one end of the capacitor C2, and the sixth pin of the main control chip U1. The other end of the capacitor C2, the other end of the capacitor C4, and the second and third pins of the crystal oscillator Y1 are grounded.
[0008] This utility model is further improved in that the first voltage divider circuit includes a diode VZ1, a resistor R2, a capacitor C1, and a resistor R4. One end of the resistor R2 is connected to one end of the precision resistor R1 and the output terminal of the power supply. The other end of the resistor R2 is connected to the negative terminal of the diode VZ1, one end of the capacitor C1, one end of the resistor R4, and pin 58 of the main control chip U1. The positive terminal of the diode VZ1, the other end of the capacitor C1, and the other end of the resistor R4 are grounded.
[0009] This utility model is further improved in that the second voltage divider circuit includes a diode VZ2, a resistor R3, a capacitor C3, and a resistor R5. One end of the resistor R3 is connected to the other end of the precision resistor R1 and the input terminal of the load device. The other end of the resistor R3 is connected to the negative terminal of the diode VZ2, one end of the capacitor C3, one end of the resistor R5, and pin 56 of the main control chip U1. The positive terminal of the diode VZ2, the other end of the capacitor C3, and the other end of the resistor R5 are grounded.
[0010] This utility model is further improved, and the main control chip U1 is model GD32F305RBT6.
[0011] This utility model is further improved in that the diodes VZ1 and VZ2 are both of model number MMSZ5231BS.
[0012] Compared with the prior art, the beneficial effects of this utility model are: it provides a simple voltage and current detection circuit. By setting up a power supply, a first voltage divider circuit, a second voltage divider circuit, a voltage and current analysis main control circuit, and a load device in a simple voltage and current detection circuit, and a precision resistor R1 is also provided between the power supply and the load device, the voltage and current analysis main control circuit can receive the voltage signals input from the first voltage divider circuit and the second voltage divider circuit and analyze the voltage across the precision resistor R1 and the current of the load device. This can realize a simple voltage and current detection circuit, replacing the dedicated voltage and current detection sensor chip. It is suitable for electronic devices with various complex circuits, achieving the purpose of simplifying the circuit and saving costs. Moreover, the simple voltage and current detection circuit is more stable and has a lower failure rate, solving the problem that the voltage and current detection circuits in the prior art generally use dedicated voltage and current detection sensor chips, resulting in high costs. Attached Figure Description
[0013] To more clearly illustrate the solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0014] Figure 1 This is a schematic diagram of a simple voltage and current detection circuit according to the present invention.
[0015] Figure 2 This is a circuit diagram of a simple voltage and current detection circuit according to the present invention. Detailed Implementation
[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects, not to describe a particular order.
[0017] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0018] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
[0019] like Figures 1-2 As shown, this utility model provides a simple voltage and current detection circuit, including a power supply, a first voltage divider circuit, a second voltage divider circuit, a voltage and current analysis main control circuit, and a load device. The output terminal of the power supply is connected to the load device for power supply. A precision resistor R1 is also provided between the power supply and the load device. The input terminal of the first voltage divider circuit is connected to one end of the precision resistor R1 and the output terminal of the power supply. The output terminal of the first voltage divider circuit is connected to the input terminal of the voltage and current analysis main control circuit. The input terminal of the second voltage divider circuit is connected to the other end of the precision resistor R1 and the input terminal of the load device. The output terminal of the second voltage divider circuit is connected to the input terminal of the voltage and current analysis main control circuit. In this embodiment, the voltage and current analysis main control circuit can receive the voltage signals input from the first voltage divider circuit and the second voltage divider circuit, and analyze the voltage across the precision resistor R1 and the current of the load device. This enables a simple voltage and current detection circuit, replacing a dedicated voltage and current sensor chip. It is suitable for various complex electronic circuits, simplifying the circuit and saving costs. Furthermore, the simple voltage and current detection circuit is more stable and has a lower failure rate. The simple voltage and current detection circuit of this invention can achieve different voltage and current detection values by adjusting the first voltage divider circuit, the second voltage divider circuit, and the precision resistor R1, making it flexible for application in various circuit designs.
[0020] like Figures 1-2As shown, the main control circuit for voltage and current analysis includes a main control chip U1, model GD32F305RBT6, with 64 pins. Pin 58 of U1 is connected to the output of the first voltage divider circuit, and pin 56 is connected to the output of the second voltage divider circuit. The main control circuit also includes a crystal oscillator Y1, resistor R6, capacitor C2, and capacitor C4. Crystal oscillator Y1 has four pins: pin 1 is connected to one end of resistor R6, one end of capacitor C4, and pin 5 of main control chip U1; pin 4 is connected to the other end of resistor R6, one end of capacitor C2, and pin 6 of main control chip U1; and the other ends of capacitors C2 and C4, as well as pins 2 and 3 of crystal oscillator Y1, are grounded. The first voltage divider circuit includes a diode VZ1 and resistor R2. The first voltage divider circuit consists of a capacitor C1 and a resistor R4. One end of resistor R2 is connected to one end of precision resistor R1 and the output terminal of the power supply. The other end of resistor R2 is connected to the negative terminal of diode VZ1, one end of capacitor C1, one end of resistor R4, and pin 58 of the main control chip U1. The positive terminal of diode VZ1, the other end of capacitor C1, and the other end of resistor R4 are grounded. The second voltage divider circuit consists of a diode VZ2, a resistor R3, a capacitor C3, and a resistor R5. One end of resistor R3 is connected to the other end of precision resistor R1 and the input terminal of the load device. The other end of resistor R3 is connected to the negative terminal of diode VZ2, one end of capacitor C3, one end of resistor R5, and pin 56 of the main control chip U1. The positive terminal of diode VZ2, the other end of capacitor C3, and the other end of resistor R5 are grounded. Diodes VZ1 and VZ2 are both MMSZ5231BS. In this embodiment, the output terminal VCC_IN of the power supply is connected to VCC_OUT through a precision resistor R1 to supply power to the load device. Since VCC_IN is generally a relatively high voltage, a first voltage divider circuit and a second voltage divider circuit are needed to supply power to the ADC interface of the main control chip U1. Here, resistors R2, R4, R3, and R5 are simply used for voltage division. Different resistance values can be adjusted according to specific situations. Capacitor C1, diode VZ1, capacitor C3, and diode VZ2 are used to protect the ADC interface of the main control chip U1 and prevent pins 58 and 56 of the main control chip U1 from being subjected to external high voltage surges.The main control chip U1 receives the signal from the first voltage divider circuit and can calculate the voltage value of VOL1. The first voltage divider circuit can also calculate the voltage value of the output terminal VCC_IN of the power supply. Similarly, the second voltage divider circuit can calculate the voltage values of VOL2 and VCC_OUT. The voltage of VCC_OUT is the voltage value to be detected. Subtracting the voltage value of VCC_OUT from VCC_IN gives the voltage difference of the precision resistor R1. By dividing the voltage difference by the resistance value of the precision resistor R1 using Ohm's law, the magnitude of the load current can be obtained, thus completing the current detection.
[0021] As can be seen from the above, this utility model provides a simple voltage and current detection circuit. By setting up a power supply, a first voltage divider circuit, a second voltage divider circuit, a voltage and current analysis main control circuit, and a load device in a simple voltage and current detection circuit, and a precision resistor R1 is also provided between the power supply and the load device, the voltage and current analysis main control circuit can receive the voltage signals input from the first voltage divider circuit and the second voltage divider circuit and analyze the voltage across the precision resistor R1 and the current of the load device. This can realize a simple voltage and current detection circuit, which can replace the dedicated voltage and current detection sensor chip. It is suitable for electronic devices with various complex circuits, achieving the purpose of simplifying the circuit and saving costs. Moreover, the simple voltage and current detection circuit is more stable and has a lower failure rate, solving the problem that the existing voltage and current detection circuits generally use dedicated voltage and current detection sensor chips, resulting in high costs.
[0022] The specific embodiments described above are preferred embodiments of this utility model, and are not intended to limit the specific scope of this utility model. The scope of this utility model includes but is not limited to the specific embodiments described above. All equivalent changes made in accordance with this utility model are within the protection scope of this utility model.
Claims
1. A simple voltage and current detection circuit, characterized in that: The system includes a power supply, a first voltage divider circuit, a second voltage divider circuit, a voltage and current analysis main control circuit, and a load device. The output terminal of the power supply is connected to the load device. A precision resistor R1 is also provided between the power supply and the load device. The input terminal of the first voltage divider circuit is connected to one end of the precision resistor R1 and the output terminal of the power supply. The output terminal of the first voltage divider circuit is connected to the input terminal of the voltage and current analysis main control circuit. The input terminal of the second voltage divider circuit is connected to the other end of the precision resistor R1 and the input terminal of the load device. The output terminal of the second voltage divider circuit is connected to the input terminal of the voltage and current analysis main control circuit. The voltage and current analysis main control circuit can receive the voltage signals input from the first voltage divider circuit and the second voltage divider circuit and analyze the voltage across the precision resistor R1 and the current of the load device.
2. The simple voltage and current detection circuit according to claim 1, characterized in that: The voltage and current analysis main control circuit includes a main control chip U1 with 64 pins. Pin 58 of the main control chip U1 is connected to the output of the first voltage divider circuit, and pin 56 of the main control chip U1 is connected to the output of the second voltage divider circuit.
3. The simple voltage and current detection circuit according to claim 2, characterized in that: The voltage and current analysis main control circuit also includes a crystal oscillator Y1, a resistor R6, a capacitor C2, and a capacitor C4. The crystal oscillator Y1 has four pins. The first pin of the crystal oscillator Y1 is connected to one end of the resistor R6, one end of the capacitor C4, and the fifth pin of the main control chip U1. The fourth pin of the crystal oscillator Y1 is connected to the other end of the resistor R6, one end of the capacitor C2, and the sixth pin of the main control chip U1. The other end of the capacitor C2, the other end of the capacitor C4, and the second and third pins of the crystal oscillator Y1 are grounded.
4. The simple voltage and current detection circuit according to claim 3, characterized in that: The first voltage divider circuit includes a diode VZ1, a resistor R2, a capacitor C1, and a resistor R4. One end of the resistor R2 is connected to one end of the precision resistor R1 and the output terminal of the power supply. The other end of the resistor R2 is connected to the negative terminal of the diode VZ1, one end of the capacitor C1, one end of the resistor R4, and pin 58 of the main control chip U1. The positive terminal of the diode VZ1, the other end of the capacitor C1, and the other end of the resistor R4 are grounded.
5. The simple voltage and current detection circuit according to claim 4, characterized in that: The second voltage divider circuit includes a diode VZ2, a resistor R3, a capacitor C3, and a resistor R5. One end of the resistor R3 is connected to the other end of the precision resistor R1 and the input terminal of the load device. The other end of the resistor R3 is connected to the negative terminal of the diode VZ2, one end of the capacitor C3, one end of the resistor R5, and pin 56 of the main control chip U1. The positive terminal of the diode VZ2, the other end of the capacitor C3, and the other end of the resistor R5 are grounded.
6. The simple voltage and current detection circuit according to claim 5, characterized in that: The main control chip U1 is model GD32F305RBT6.
7. The simple voltage and current detection circuit according to claim 6, characterized in that: Both diodes VZ1 and VZ2 are model MMSZ5231BS.