CN-122017315-A - Voltage rapid detection circuit

Abstract

The invention discloses a voltage rapid detection circuit which comprises a voltage dividing circuit, a diode protection circuit and a filter circuit, wherein an input power supply U is connected with a high-potential end of a resistor I R1, a low-potential end of the resistor I R1 is connected with a high-potential end of a resistor II R2, a low-potential end of the resistor II R2 is grounded, a +5V power supply is singly connected with a low-potential end of a diode, a 0V power supply is singly connected with a high-potential end of the other diode, a common end connected with the two diodes is connected with a low-potential end of the resistor I R1 or a high-potential end of the resistor II R2, a high-potential end of a resistor III R3 is connected with a common end connected with the two diodes or a low-potential end of the resistor I R1 or a high-potential end of the resistor II R2, a capacitor C1 is connected with a low-potential end of the resistor III R3, and the low-potential end of the resistor III R3 is a voltage detection end. The device realizes that different input voltages can ensure that components of the detection end are not easy to damage, and meanwhile, the existing hardware is not changed while the cost is low.

Inventors

• ZHANG ZHIWEI

Assignees

• 北京大华无线电仪器有限责任公司

Dates

Publication Date

20260512

Application Date

20260206

Claims (5)

1. 1. The voltage rapid detection circuit is characterized by comprising a voltage dividing circuit, a diode protection circuit and a filter circuit; the voltage dividing circuit comprises an input power supply U, a first resistor (R1) and a second resistor (R2), wherein the input power supply U is connected with the high potential end of the first resistor (R1), the low potential end of the first resistor (R1) is connected with the high potential end of the second resistor (R2), and the low potential end of the second resistor (R2) is grounded.
2. 2. The rapid voltage detection circuit of claim 1 wherein the diode protection circuit comprises a +5V power supply connected to the low potential terminal of one diode, a 0V power supply connected to the high potential terminal of the other diode, and a common termination resistor connected to the two diodes, either the low potential terminal of resistor one (R1) or the high potential terminal of resistor two (R2).
3. 3. The fast voltage detection circuit according to claim 2, wherein the filter circuit comprises a resistor three (R3) with a high potential end connected to a common end connected to two diodes or a low potential end of a resistor one (R1) or a high potential end of a resistor two (R2), a capacitor (C1) connected to a low potential end of the resistor three (R3), and a low potential end of the resistor three (R3) being a voltage detection end.
4. 4. A voltage quick detect circuit according to claim 3, wherein the two diodes are of opposite polarity.
5. 5. The circuit according to any one of claims 1 to 4, wherein an oscilloscope is connected to a connection point between the low potential end of the first resistor (R1) and the high potential end of the second resistor (R2).

Description

Voltage rapid detection circuit Technical Field The present disclosure relates to electronic devices, and particularly to a voltage fast detection circuit. Background With the demands of production and scientific technology development, the current electronic technology application has penetrated all links of life and production of people, and the manufacture of components, communication equipment, computers, television electronic equipment and the like. In the design or use process, in order to avoid unreliable use conditions such as level failure or excessive voltage, etc., damage to the device can be caused. So that one would add a detection circuit or a protection circuit to the device to stabilize the operation of the device. Therefore, a voltage detection circuit should be provided. The voltage detection circuit is divided into three parts. And the first voltage dividing part is used for dividing the input power supply through the connection of two resistor strings. And the second part, the detection end is connected with the connection ends of the two resistors. And the third part, the connection ends of the two resistors are connected with the anode of the diode, and the cathode is connected with +5V voltage. The connection end of the two resistors is also connected with the cathode of the other diode, and the anode is connected with 0V voltage. When the voltage of the connecting end obtained by the voltage dividing resistor of the input voltage is higher than +5V or lower than 0V, the voltage of the detecting end is detected through voltage adjustment of the two ends of the diode. The voltage detection circuit of the prior art has the following defects: different input voltages are difficult to ensure that components of the detection end are not damaged. In view of this, the present invention has been made. Disclosure of Invention The invention aims to provide a voltage rapid detection circuit so as to solve the technical problems in the prior art. The invention aims at realizing the following technical scheme: A voltage rapid detection circuit comprises a voltage dividing circuit, a diode protection circuit and a filter circuit; The voltage dividing circuit comprises an input power supply U connected with the high potential end of a resistor I R1, the low potential end of the resistor I R1 connected with the high potential end of a resistor II R2, and the low potential end of the resistor II R2 grounded. Compared with the prior art, the voltage rapid detection circuit provided by the invention uses two or more resistor voltage dividing circuits, takes one point as input, takes a diode and a filter circuit as media, detects stable voltage with the detection end of 0-5V, and adopts a connection method of the two or more resistor voltage dividing circuits and a connection method of using the diode end as a sampling voltage limiting mode. The different input voltages can be realized, so that the components of the detection end are not easy to damage, and meanwhile, the existing hardware is not changed while the cost is low. Drawings Fig. 1 is a schematic diagram of a voltage fast detecting circuit according to an embodiment of the invention. Detailed Description The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments of the present invention, and this is not limiting to the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention. The terms that may be used herein will first be described as follows: The terms "comprises," "comprising," "includes," "including," "has," "having" or other similar referents are to be construed to cover a non-exclusive inclusion. The term "consisting of" means excluding any technical feature elements not explicitly listed. If such term is used in a claim, the term will cause the claim to be closed, such that it does not include technical features other than those specifically listed, except for conventional impurities associated therewith. If the term is intended to appear in only a clause of a claim, it is intended to limit only the elements explicitly recited in that clause, and the elements recited in other clauses are not excluded from the overall claim. The technical scheme provided by the invention is described in detail below. What is not described in detail in the embodiments of the present invention belongs to the prior art known to those skilled in the art. The specific conditions are not noted in the examples of the present invention and are carried out according to the conditions conventional in the art or suggested by the manufacturer