CN211603329U

CN211603329U - Voltage detection system

Info

Publication number: CN211603329U
Application number: CN201921400581.2U
Authority: CN
Inventors: 龙智强; 谭建明; 郭文标
Original assignee: Zhuhai Shengchi Electrical Appliance Co ltd
Current assignee: Zhuhai Shengchi Electrical Appliance Co ltd
Priority date: 2019-08-27
Filing date: 2019-08-27
Publication date: 2020-09-29
Anticipated expiration: 2029-08-27

Abstract

The utility model discloses a voltage detection system, including voltage detection module and CPU treater, voltage detection module input termination indoor voltage unit, voltage detection module output is connected with the CPU treater, the utility model discloses can provide a simulated voltage value for the CPU treater, make the singlechip can make a correct judgement through judging this voltage value, make electrical apparatus work under a normal state; the utility model discloses the theory of operation is simple for the error of transformer is to the reduction by a wide margin of the influence of voltage, and voltage output's stability also has the promotion that is showing, can be used to ice-cream machine's voltage self-checking protection.

Description

Voltage detection system

Technical Field

The utility model relates to a voltage detection technical field specifically is a voltage detection system.

Background

Along with the intelligent development of household appliances, more and more household appliances need to use a voltage detection system to more intuitively know whether the process of using the appliances is dangerous or not. For example, the voltage of a large stirring device is too high or too low, which can cause the current of the stirrer to be too high or the voltage to exceed the rated value of the motor, thereby causing operation failure and damage, and seriously possibly causing personal safety. The prior art uses a transformer, fast diodes, and several resistive capacitors to reduce and filter the indoor voltage, resulting in excessive accuracy of the most demanding transformer, which increases its cost. The voltage is reduced by using the transformer, so that the design of a circuit is facilitated, the use of elements is reduced, but the detection precision is always poor, the influence of the environment is large, and the danger of abnormal work can be met.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a voltage detection system to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: a voltage detection system comprises a voltage detection module and a CPU (central processing unit), wherein the input end of the voltage detection module is connected with an indoor voltage unit, and the output end of the voltage detection module is connected with the CPU; the voltage detection module comprises a comparator and a transformer, the model of the comparator adopts LM324, the positive input end of the comparator is respectively connected with one end of a capacitor A and one end of a transformer secondary coil of a resistor B and is grounded, the negative input end of the comparator is respectively connected with one end of a resistor A, one end of a resistor D, the anode of a diode and one end of a resistor C, the other end of the resistor C is respectively connected with the other end of the capacitor A, the other end of the resistor B and the other end of the transformer secondary coil, one end of a transformer primary coil is connected with one end of the resistor A, the other end of the resistor A and the other end of the transformer primary coil are connected with a voltage input end, the output end of the comparator is respectively connected with one end of the resistor D and the anode of the diode, the cathode of the diode is respectively connected, the other end of the capacitor B is connected with the other end of the capacitor C and is grounded '', and the CPU processor adopts an AT89C51 singlechip.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model can provide a simulated voltage value for the CPU processor, so that the single chip microcomputer can make a correct judgment by judging the voltage value, and the electric appliance works in a normal state; the utility model discloses the theory of operation is simple for the error of transformer is to the reduction by a wide margin of the influence of voltage, and voltage output's stability also has the promotion that is showing, can be used to ice-cream machine's voltage self-checking protection.

Drawings

FIG. 1 is a schematic block diagram of the present invention;

fig. 2 is a circuit diagram of the voltage detection module of the present invention.

In the figure: the device comprises a voltage detection module 1, a CPU (central processing unit) 2, an indoor voltage unit 3, a comparator 4, a transformer 5 and a diode 6.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution: the voltage detection system comprises a voltage detection module 1 and a CPU (Central processing Unit) processor 2, wherein the input end of the voltage detection module 1 is connected with an indoor voltage unit 3, the output end of the voltage detection module 1 is connected with the CPU processor 2, and the CPU processor 2 adopts an AT89C51 single chip microcomputer.

In the utility model, the voltage detection module 1 comprises a comparator 4 and a transformer 5, the model of the comparator 4 is LM324, the positive input end of the comparator 4 is connected with one end of a capacitor A1B and one end of a resistor B2a, the secondary coil of the transformer 5 is connected with one end of the ground, the negative input end of the comparator 4 is connected with one end of a resistor A1a, one end of a resistor D4a, the positive electrode of a diode 6 and one end of a resistor C3a, the other end of the resistor C3a is connected with the other end of a capacitor A1C, the other end of a resistor B2a and the other end of the secondary coil of the transformer 5, one end of the primary coil of the transformer 5 is connected with one end of a resistor A1a, the other end of a resistor A1a and the other end of the primary coil of the transformer 5 are connected with the voltage input end, the output end of the comparator 4 is connected with one end of a resistor D4a and the, the other end of the resistor E5a is connected with one end of a capacitor C3B and a voltage output end respectively, and the other end of the capacitor B2B is connected with the other end of the capacitor C3B and is grounded.

The working principle is as follows: the utility model discloses a use method includes following step:

A. the resistor A1a and the primary side of the transformer form a loop of room electric voltage, the value of the resistor 1a is set, so that the potential at two ends of the primary side of the transformer is kept at a proper value, and the voltage of the primary side and the voltage of the secondary side of the transformer T1 are not changed and are output;

B. the resistor B2a is used for a dummy load to consume redundant energy for a voltage detection module, the capacitor A1B is used for a circuit to carry out first-stage filtering processing, and the resistor 3a is used for keeping the secondary output current of the transformer flowing into the comparator stably;

C. the diode rectifies an alternating current signal into a direct current signal, the voltage amplification factor of the direct current signal is controlled by the resistor D4a and the resistor C3a, secondary filtering is performed by the capacitor B2B, the capacitor C3B and the resistor E5a, and the port P1 of the CPU processor receives the voltage signal.

To sum up, the utility model can provide a simulated voltage value for the CPU processor, so that the single chip microcomputer can make a correct judgment by judging the voltage value, and the electric appliance works in a normal state; the utility model discloses the theory of operation is simple for the error of transformer is to the great reduction of influence of voltage, and voltage output's stability also has apparent promotion, voltage self-checking protection that can be used to ice-cream machine although having shown and described the embodiment of the utility model, to the ordinary skilled person in this field, can understand to carry out multiple change, modification, replacement and the variant to these embodiments under the circumstances that does not deviate from the principle and the spirit of the utility model, the scope of the utility model is defined by attached claim and its equivalent.

Claims

1. A voltage detection system comprising a voltage detection module (1) and a CPU processor (2), characterized in that: the input end of the voltage detection module (1) is connected with the indoor voltage unit (3), and the output end of the voltage detection module (1) is connected with the CPU (2); the voltage detection module (1) comprises a comparator (4) and a transformer (5), the model of the comparator (4) adopts LM324, the anode input end of the comparator (4) is respectively connected with one end of a capacitor A (1B), one end of a resistor B (2a), one end of a secondary coil of the transformer (5) and is grounded, the cathode input end of the comparator (4) is respectively connected with one end of a resistor A (1a), one end of a resistor D (4a), the anode of a diode (6) and one end of a resistor C (3a), the other end of the resistor C (3a) is respectively connected with the other end of a capacitor A (1C), the other end of a resistor B (2a) and the other end of the secondary coil of the transformer (5), one end of a primary coil of the transformer (5) is connected with one end of the resistor A (1a), the other end of the resistor A (1a) and the other end, the output end of the comparator (4) is respectively connected with one end of a resistor D (4a) and the anode of a diode (6), the cathode of the diode (6) is respectively connected with the other end of the resistor D (4a), one end of a resistor E (5a) and one end of a capacitor B (2B), the other end of the resistor E (5a) is respectively connected with one end of a capacitor C (3B) and a voltage output end, and the other end of the capacitor B (2B) is connected with the other end of the capacitor C (3B) and grounded; the CPU processor (2) adopts an AT89C51 singlechip.