Rapid voltage detection circuit

Abstract

The invention discloses a rapid voltage detection circuit which comprises a voltage division circuit, a diode protection circuit and a filter circuit. An input power supply U is connected with a high-potential end of a first resistor R1, a low-potential end of the first resistor R1 is connected with a high-potential end of a second resistor R2, and a low-potential end of the second resistor R2 is grounded; a + 5V power supply is independently connected with a low-potential end of one diode, a 0V power supply is independently connected with a high-potential end of the other diode, and a common end where the two diodes are connected is connected with a low-potential end of a first resistor R1 or a high-potential end of a second resistor R2; the high potential end of the third resistor R3 is connected with the common end where the two diodes are connected or the low potential end of the first resistor R1 or the high potential end of the second resistor R2, the capacitor C1 is connected with the low potential end of the third resistor R3, and the low potential end of the third resistor R3 is a voltage detection end. Different input voltages can ensure that components at a detection end are not easy to damage, and meanwhile, the existing hardware is not changed while low cost is realized.

Description

Technical Field

[0001] This invention relates to protection circuits for electronic devices, and more particularly to a fast voltage detection circuit. Background Technology

[0002] With the development of production and science and technology, electronic technology has permeated all aspects of people's lives and production, including component manufacturing, communication equipment, computers, and television electronic equipment. During the design or use process, to avoid unreliable conditions such as voltage level failure or excessive voltage that could damage components, detection or protection circuits are often added to stabilize the equipment's operation. Therefore, a voltage detection circuit has emerged.

[0003] The voltage detection circuit consists of three parts. The first part is a voltage divider, where the input power supply is grounded via two resistors connected in series. The second part connects the detection terminal to the junction of the two resistors. The third part connects the junction of the two resistors to the anode of a diode, while the cathode is connected to +5V. Additionally, the junction of two resistors is connected to the cathode of another diode, with the anode connected to 0V. When the input voltage, obtained through the voltage divider resistors, is higher than +5V or lower than 0V, the voltage across the diode is adjusted to detect the voltage at the detection terminal.

[0004] The disadvantages of existing voltage detection circuits are:

[0005] Different input voltages make it difficult to guarantee that the components at the detection end will not be damaged.

[0006] In view of this, the present invention is hereby proposed. Summary of the Invention

[0007] The purpose of this invention is to provide a fast voltage detection circuit to solve the aforementioned technical problems existing in the prior art.

[0008] The objective of this invention is achieved through the following technical solution:

[0009] A voltage fast detection circuit includes a voltage divider circuit, a diode protection circuit, and a filter circuit;

[0010] The voltage divider circuit includes: the input power supply U is connected to the high potential end of resistor R1, the low potential end of resistor R1 is connected to the high potential end of resistor R2, and the low potential end of resistor R2 is grounded.

[0011] Compared with existing technologies, the voltage fast detection circuit provided by this invention uses two or more resistors to divide the voltage, taking one of them as the input, and a diode and filter circuit as the dielectric. It detects a stable voltage of 0 to 5V at the detection terminal through a voltage divider connection using two or more resistors; and uses two terminals as the sampling voltage limit connection. This allows for different input voltages while ensuring that the components at the detection terminal are not easily damaged, and simultaneously achieves low cost without changing existing hardware. Attached Figure Description

[0012] Figure 1 A schematic diagram of a fast voltage detection circuit is provided for an embodiment of the present invention. Detailed Implementation

[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them, and do not constitute a limitation on the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0014] First, the following explanations are provided for the terms that may be used in this article:

[0015] The terms “including,” “contains,” “comprising,” “having,” or other similar semantic descriptions shall be interpreted as non-exclusive inclusion.

[0016] The term "composed of" excludes any technical features not expressly listed. When used in a claim, it closes the claim to exclude all technical features other than those expressly listed, except for associated conventional impurities. If the term appears only in a clause of a claim, it limits the claim to the elements expressly listed in that clause; elements recited in other clauses are not excluded from the overall claim.

[0017] The technical solution provided by this invention will be described in detail below. Contents not described in detail in the embodiments of this invention are prior art known to those skilled in the art. Where specific conditions are not specified in the embodiments of this invention, they shall be performed according to conventional conditions in the art or conditions recommended by the manufacturer. Reagents or instruments used in the embodiments of this invention whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0018] like Figure 1 As shown, a voltage fast detection circuit includes a voltage divider circuit, a diode protection circuit, and a filter circuit.

[0019] The voltage divider circuit includes: the input power supply U is connected to the high potential end of resistor R1, the low potential end of resistor R1 is connected to the high potential end of resistor R2, and the low potential end of resistor R2 is grounded.

[0020] The diode protection circuit includes: a +5V power supply connected to the low potential end of one diode, a 0V power supply connected to the high potential end of another diode, and the common terminal of the two diodes connected to the low potential end of resistor R1 or the high potential end of resistor R2.

[0021] The filter circuit includes: the high potential end of resistor R3 is connected to the common terminal of two diodes, or the low potential end of resistor R1, or the high potential end of resistor R2; capacitor C1 is connected to the low potential end of resistor R3; and the low potential end of resistor R3 is the voltage detection terminal.

[0022] The two diodes have opposite polarities.

[0023] An oscilloscope is connected to the connection point between the low potential end of resistor R1 and the high potential end of resistor R2.

[0024] In summary, the voltage fast detection circuit of this invention uses two or more resistors to divide the voltage, taking one of them as the input, and a diode and filter circuit as the dielectric. It detects a stable voltage of 0 to 5V at the detection terminal through a voltage divider configuration using two or more resistors; and uses two terminals as the sampling voltage limit. This allows for different input voltages while ensuring that the components at the detection terminal are not easily damaged, and simultaneously achieves low cost without changing existing hardware.

[0025] To more clearly demonstrate the technical solution and its effects provided by the present invention, the voltage fast detection circuit provided by the embodiments of the present invention will be described in detail below with reference to specific examples.

[0026] 1. The voltage fast detection circuit includes:

[0027] A voltage detection circuit is a design that transforms the input voltage through a resistor divider and then supplies a voltage level to the detection terminal. Its technical solution includes:

[0028] First, connect the input voltage to two resistors connected in series;

[0029] Secondly, the voltage divider is limited by connecting 0V and 5V using two diodes;

[0030] Then, connect the pin detection terminal to the middle terminal of the series resistor;

[0031] Finally, use an oscilloscope to connect the two resistors to the middle section to observe the waveform and values.

[0032] 2. Advantages of the fast voltage detection circuit

[0033] 1) By using a voltage divider circuit and a diode voltage limiting circuit, the voltage at the detection terminal is always maintained between 0 and 5V, ensuring that it does not exceed the detection range of the safety device and thus prevent damage to the detection terminal components. Furthermore, it can be analyzed that damage to the detection terminal components due to changes in the input terminal U can also be avoided.

[0034] 2) This fast voltage detection circuit is built with hardware components, and its response speed is faster than that of software detection and protection. Furthermore, the hardware components are simple and low-cost.

[0035] 3. The technical problem to be solved by this invention:

[0036] 1) Achieving different input voltages can ensure that the components at the detection end are not easily damaged.

[0037] 2) Achieve low cost without changing the existing hardware operating principle.

[0038] 2.2 The complete technical solution provided by this invention (invention solution)

[0039] Example 1

[0040] like Figure 1 The following is stated:

[0041] This unit is mainly divided into three parts: voltage divider circuit, diode protection circuit, and filter circuit.

[0042] Part 1: Voltage divider circuit, the input power supply U is connected to the high potential end of resistor R1, the low potential end of resistor R1 is connected to the high potential end of R2, and the low potential end of R2 is grounded.

[0043] Part 2: Diode protection circuit. The +5V power supply is connected to the low potential end of the diode, and the 0V power supply is connected to the high potential end of the other diode. The common terminal of the diodes is connected to the low potential end of R1 or the high potential end of R2.

[0044] Part 3: Filtering circuit. Resistor R3 is connected to the common terminal of the diode, or to the low potential terminal of R1 or the high potential terminal of R2. Capacitor C1 is connected to the low potential terminal of R3. The low potential terminal of R3 is the voltage detection terminal.

[0045] The beneficial effects of the technical solution of this invention are as follows:

[0046] 1) Achieving different input voltages can ensure that the components at the detection end are not easily damaged.

[0047] 2) Achieve low cost without changing the existing hardware operating principle.

[0048] Key technical points of this invention:

[0049] A detection method that uses two or more resistors to divide the voltage, takes one of them as the input, uses diodes and filter circuits as the medium, and has a stable voltage of 0 to 5V at the detection terminal;

[0050] A voltage divider connection using two or more resistors;

[0051] A connection method that uses two terminals as the sampling voltage limit.

[0052] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims. The information disclosed in the background section is intended only to enhance the understanding of the overall background technology of the present invention and should not be construed as an admission or implication in any way that such information constitutes prior art known to those skilled in the art.

Claims

1. A voltage fast detection circuit, characterized in that, Includes voltage divider circuits, diode protection circuits, and filter circuits; The voltage divider circuit includes: the input power supply U is connected to the high potential end of resistor one (R1), the low potential end of resistor one (R1) is connected to the high potential end of resistor two (R2), and the low potential end of resistor two (R2) is grounded.

2. The voltage fast detection circuit according to claim 1, characterized in that, The diode protection circuit includes: a +5V power supply connected to the low potential end of one diode, a 0V power supply connected to the high potential end of another diode, and the common terminal of the two diodes connected to the low potential end of resistor one (R1) or the high potential end of resistor two (R2).

3. The voltage fast detection circuit according to claim 2, characterized in that, The filter circuit includes: the high potential end of resistor three (R3) is connected to the common terminal of two diodes, or the low potential end of resistor one (R1) or the high potential end of resistor two (R2), capacitor (C1) is connected to the low potential end of resistor three (R3), and the low potential end of resistor three (R3) is the voltage detection terminal.

4. The voltage fast detection circuit according to claim 3, characterized in that, The two diodes have opposite polarities.

5. The voltage fast detection circuit according to any one of claims 1 to 4, characterized in that, An oscilloscope is connected to the connection point between the low potential end of resistor one (R1) and the high potential end of resistor two (R2).

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