CN218675129U

CN218675129U - Simple AC voltage monitoring device based on motor-driven PWM carrier

Info

Publication number: CN218675129U
Application number: CN202222493875.2U
Authority: CN
Inventors: 凌立本; 张小群; 薛天威
Original assignee: Leibo Electric Changzhou Co ltd
Current assignee: Leibo Electric Changzhou Co ltd
Priority date: 2022-09-20
Filing date: 2022-09-20
Publication date: 2023-03-21
Anticipated expiration: 2032-09-20

Abstract

The utility model relates to a voltage monitoring technical field especially relates to a simple and easy AC voltage monitoring devices based on motor drive PWM carrier, including AC voltage, RC filter circuit, MCU circuit, ADC circuit and DC voltage, the output of AC voltage with RC filter circuit's input is connected, RC filter circuit with the input of MCU circuit is connected, the output of MCU circuit with the input of ADC circuit is connected, the output of ADC circuit with the DC voltage is connected. Can directly sample AC voltage on hardware, use resistance partial pressure after, can directly give the MCU circuit through behind the RC filtering, the MCU circuit uses the ADC module to sample, can directly detect the size and the frequency of specific AC voltage.

Description

Simple AC voltage monitoring device based on motor-driven PWM carrier

Technical Field

The utility model relates to a voltage monitoring technology field especially relates to a simple and easy AC voltage monitoring devices based on motor drive PWM carrier.

Background

In a traditional rectifying and filtering circuit, because a circuit contains a large capacitor, when the circuit is electrified for the first time, the capacitor is equivalent to a short circuit, so that a large charging current can be caused, in order to limit the charging current, a PTC resistor is arranged, after the capacitor charging of 2s and the like after the electrification is completed, the PTC resistor is completed, and then a relay K1 is closed through software to short circuit, which is the electrifying process of the whole circuit, when an AC voltage (220 VAC) is cut off, the LN input end in the circuit does not have voltage, but because of the existence of the large capacitor, the DC voltage after rectifying and filtering is not immediately 0 but slowly drops, at this time, a problem exists, when the DC voltage drops to 100V, a rear MCU still has electricity, at this time, the relay K1 is not disconnected, after the AC voltage (220 VAC) is electrified again, the DC voltage after rectifying and filtering is 310V through rectifying, so that a voltage difference exists between the large capacitor and a rectifying bridge, so that the internal resistance of a wire is very small, and the relay is still in a closed state, and the impact current on a bus can cause the relay to be very large, and the relay to be stuck;

a solution is then needed to detect whether the AC voltage is disconnected and to open the relay K1 in time when the AC voltage is disconnected, protecting the relay and the following circuits from damage due to excessive inrush current.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the shortcoming that exists among the prior art, and the simple and easy AC voltage monitoring device based on motor drive PWM carrier that proposes.

In order to realize the purpose, the utility model adopts the following technical scheme:

a simple AC voltage monitoring device based on a motor-driven PWM carrier comprises an AC voltage, an RC filter circuit, an MCU circuit, an ADC circuit and a DC voltage, wherein the output end of the AC voltage is connected with the input end of the RC filter circuit;

wherein, the output of AC voltage is connected with plug connector J1, the output of plug connector J1 is connected with diode D10, diode D10's negative pole is connected with test point TP167, the output of TP167 is connected with diode D11, diode D11 with diode D10 constitutes a parallel circuit, and this parallel circuit's output is connected with resistance R29, resistance R29's output is connected with test point TP40, and test point TP 40's output is connected with resistance R35, resistance R35's output is connected with test point TP47, test point TP 47's output is connected with resistance R38, resistance R38's output is connected with test point TP52.

Preferably, the types of the diode D10 and the diode D11 are S1M rectifier diodes, the types of the resistor R29 and the resistor R35 are R-1206-499K-F chip resistors, and the types of the resistor R38 are R-1206-330K-F chip resistors.

Preferably, the RC filter circuit includes a resistor R43, an input end of the resistor R43 is connected to an output end of the test point TP52, two ends of the resistor R43 are connected in parallel to a capacitor C25, two ends of the capacitor C25 are connected to a schottky diode D14, the capacitor C25 and the resistor R43 form a parallel circuit, one end of the parallel circuit is connected to the ADC circuit, an output voltage of the ADC circuit is 3.3V, and the other end of the parallel circuit is connected to a ground terminal GND.

Preferably, the type of the resistor R43 is R-0603-10K-F patch resistor, the type of the capacitor C25 is C-0603-1nF-50V patch capacitor, and the type of the Schottky diode D14 is BAT54S diode.

Preferably, the output of plug connector J1 still is connected with test point TP19, the output of test point TP19 is connected with rectifier bridge diode D5, rectifier bridge diode D5's fourth link is connected with test point TP25, TP 25's output is connected on the DC voltage, rectifier bridge diode D5's first link is connected with test point TP165, test point TP 165's output is connected with thermistor R15, thermistor R15 both ends are parallelly connected to have relay K1, just thermistor R15's output is in on diode D11's the positive pole, diode D11's positive pole still is connected with test point TP53, test point TP 53's output is connected with test point TP 6, the input of plug connector J6 is connected on the control pin of MCU circuit.

Preferably, the type of the rectifier bridge diode D5 is a GBJ2506 rectifier diode, the rectifier bridge diode D5 is composed of four diodes, the four diodes form a bridge full-wave rectifier circuit, the type of the thermistor R15 is a PTC thermistor, and the type of the relay K1 is an HF32FV-G power relay.

Preferably, the input end of the relay K1 is connected with a test point TP32, the input end of the test point TP32 is connected with a resistor R31, the input end of the resistor R31 is connected to the 15V voltage, two ends of the resistor R31 are connected in parallel with the resistor R34, the resistor R31 and the resistor R34 form a parallel circuit, the output end of the parallel circuit is connected with a diode D13, the anode of the diode D13 is connected with a test point TP39, the output end of the test point TP39 is connected with a triode Q2, the base level of the triode Q2 is connected with a test point TP46, the input end of the test point TP46 is connected with a resistor R36, the input end of the resistor 36 is connected with a test point TP44, the input end of the test point TP44 is connected with a surge current, the output end of the test point TP46 is connected with a resistor R37, the triode Q2 and the resistor R37 form a parallel circuit, and the output end of the parallel circuit is connected with a ground terminal GND.

Preferably, the resistor R31 and the resistor R34 are R-1206-200K-J chip resistors, the resistor R36 is R-0603-1K-F chip resistors, the resistor 37 is R-0603-4K7-F chip resistors, the triode Q2 is an NPN MMBT3904 switching transistor, and the diode D13 is a 1N4148W high-speed switching diode.

The utility model has the advantages that: the AC voltage can be directly sampled on hardware, after the voltage is divided by using resistors, the AC voltage can be directly sent to the MCU circuit after RC filtering, and the MCU circuit samples by using the ADC module and can directly detect the size and the frequency of the specific AC voltage;

through a software algorithm, whether the AC power supply is open-circuited or not can be monitored by using only one circuit, and the specific AC voltage can be obtained, so that the monitoring device has the advantages of less hardware, high detection speed, high accuracy and wide applicable voltage range.

Drawings

Fig. 1 is a schematic diagram of a hardware circuit principle of a simple AC voltage monitoring device based on a motor-driven PWM carrier according to the present invention;

fig. 2 is the utility model provides a simple and easy AC voltage monitoring devices's software program principle schematic diagram based on motor drive PWM carrier.

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.

The first embodiment is as follows: referring to fig. 1, a simple AC voltage monitoring device based on a motor-driven PWM carrier includes an AC voltage, an RC filter circuit, an MCU circuit, an ADC circuit, and a DC voltage, wherein an output end of the AC voltage is connected to an input end of the RC filter circuit, the RC filter circuit is connected to an input end of the MCU circuit, an output end of the MCU circuit is connected to an input end of the ADC circuit, and an output end of the ADC circuit is connected to the DC voltage;

wherein, the output of AC voltage is connected with plug connector J1, the output of plug connector J1 is connected with diode D10, diode D10's negative pole is connected with test point TP167, the output of TP167 is connected with diode D11, diode D11 constitutes a parallel circuit with diode D10, and this parallel circuit's output is connected with resistance R29, resistance R29's output is connected with test point TP40, test point TP 40's output is connected with resistance R35, resistance R35's output is connected with test point TP47, test point TP 47's output is connected with resistance R38, resistance R38's output is connected with test point TP52.

The types of the diode D10 and the diode D11 are S1M rectifier diodes, the types of the resistor R29 and the resistor R35 are R-1206-499K-F chip resistors, and the types of the resistor R38 are R-1206-330K-F chip resistors.

Further, the RC filter circuit includes a resistor R43, an input end of the resistor R43 is connected to an output end of the test point TP52, two ends of the resistor R43 are connected in parallel to a capacitor C25, two ends of the capacitor C25 are connected to a schottky diode D14, the capacitor C25 and the resistor R43 form a parallel circuit, one end of the parallel circuit is connected to the ADC circuit, an output voltage of the ADC circuit is 3.3V, and the other end of the parallel circuit is connected to a ground GND.

Wherein the resistor R43 is R-0603-10K-F patch resistor, the capacitor C25 is C-0603-1nF-50V patch capacitor, and the Schottky diode D14 is BAT54S diode.

Further, the output end of the plug connector J1 is further connected with a test point TP19, the output end of the test point TP19 is connected with a rectifier bridge diode D5, the fourth connecting end of the rectifier bridge diode D5 is connected with a test point TP25, the output end of the TP25 is connected with a DC voltage, the first connecting end of the rectifier bridge diode D5 is connected with a test point TP165, the output end of the test point TP165 is connected with a thermistor R15, two ends of the thermistor R15 are connected with a relay K1 in parallel, the output end of the thermistor R15 is arranged on the anode of the diode D11, the anode of the diode D11 is further connected with a test point TP53, the output end of the test point TP53 is connected with a plug connector J6, and the input end of the plug connector J6 is connected to a control pin of the MCU circuit.

The type of the rectifier bridge diode D5 is GBJ2506 rectifier diode, the rectifier bridge diode D5 is composed of four diodes, the four diodes form a bridge type full-wave rectifier circuit, the type of the thermistor R15 is PTC thermistor, and the type of the relay K1 is HF32FV-G power relay.

Further, the input end of the relay K1 is connected with a test point TP32, the input end of the test point TP32 is connected with a resistor R31, the input end of the resistor R31 is connected to the voltage of 15V, two ends of the resistor R31 are connected in parallel with the resistor R34, the resistor R31 and the resistor R34 form a parallel circuit, the output end of the parallel circuit is connected with a diode D13, the positive electrode of the diode D13 is connected with a test point TP39, the output end of the test point TP39 is connected with a triode Q2, the base level of the triode Q2 is connected with a test point TP46, the input end of the test point TP46 is connected with a resistor R36, the input end of the resistor 36 is connected with a test point TP44, the input end of the test point TP44 is connected with a surge current, the output end of the test point TP46 is connected with a resistor R37, the triode Q2 and the resistor R37 form a parallel circuit, and the output end of the parallel circuit is connected with the ground terminal GND.

The resistor R31 and the resistor R34 are R-1206-200K-J chip resistors, the resistor R36 is R-0603-1K-F chip resistor, the resistor 37 is R-0603-4K7-F chip resistor, the triode Q2 is an NPN MMBT3904 switching transistor, and the diode D13 is a 1N4148W high-speed switching diode.

In this embodiment, through directly sampling to AC voltage, AC voltage passes through plug connector J1 and enters into the circuit, divides voltage to AC voltage through a plurality of resistance, uses resistance partial pressure back, and rethread RC filter transmits AC voltage for MCU detection circuitry, and then the MCU circuit uses ADC circuit module to sample AC voltage.

The second embodiment: referring to fig. 2, on the basis of the first embodiment, a technical scheme of a simple AC voltage monitoring device based on a motor-driven PWM carrier is provided, which includes PWM pulse width modulation, a detection period of a PWM pulse width modulation signal is 16kHz, then a counter loop is entered, a minimum value and a maximum value of a voltage within 20ms are found by using an algorithm, if a difference value (Verr) between the minimum value and the maximum value within 20ms of the detection period is lower than a set threshold value, an AC power supply is open-circuited, if an error voltage Verr is higher than the set threshold value, an AC voltage is displayed, measurement is performed by reconstructing the AC voltage, and at the same time, the magnitude of the AC voltage can be determined by a difference between the maximum value and the minimum value, and if the measured AC voltage has an error, the AC voltage is reconstructed and re-input into the PWM pulse width modulation for measurement, so that erroneous determination of the AC voltage can be reduced.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. A simple AC voltage monitoring device based on a motor-driven PWM carrier comprises an AC voltage, an RC filter circuit, an MCU circuit, an ADC circuit and a DC voltage, and is characterized in that the output end of the AC voltage is connected with the input end of the RC filter circuit, the RC filter circuit is connected with the input end of the MCU circuit, the output end of the MCU circuit is connected with the input end of the ADC circuit, and the output end of the ADC circuit is connected with the DC voltage;

2. The simple AC voltage monitoring device based on the PWM carrier wave driven by the motor as claimed in claim 1, wherein the type of the diode D10 and the type of the diode D11 are S1M rectifier diodes, the type of the resistor R29 and the type of the resistor R35 are R-1206-499K-F chip resistors, and the type of the resistor R38 is R-1206-330K-F chip resistors.

3. The simple AC voltage monitoring device based on the PWM carrier driven by the motor according to claim 1, wherein the RC filter circuit comprises a resistor R43, an input terminal of the resistor R43 is connected to an output terminal of the test point TP52, a capacitor C25 is connected in parallel to two terminals of the resistor R43, a schottky diode D14 is connected to two terminals of the capacitor C25, the schottky diode D14, the capacitor C25 and the resistor R43 form a parallel circuit, one terminal of the parallel circuit is connected to the ADC circuit, an output voltage of the ADC circuit is 3.3V, and the other terminal of the parallel circuit is connected to a ground terminal GND.

4. The simple AC voltage monitoring device based on motor-driven PWM carrier waves as claimed in claim 3, wherein said resistor R43 is R-0603-10K-F chip resistor, said capacitor C25 is C-0603-1nF-50V chip capacitor, and said Schottky diode D14 is BAT54S diode.

5. The simple AC voltage monitoring device based on the motor-driven PWM carrier wave according to claim 1, characterized in that the output end of the plug connector J1 is further connected with a test point TP19, the output end of the test point TP19 is connected with a rectifier bridge diode D5, the fourth connection end of the rectifier bridge diode D5 is connected with a test point TP25, the output end of the TP25 is connected to the DC voltage, the first connection end of the rectifier bridge diode D5 is connected with a test point TP165, the output end of the test point TP165 is connected with a thermistor R15, two ends of the thermistor R15 are connected in parallel with a relay K1, the output end of the thermistor R15 is arranged on the anode of the diode D11, the anode of the diode D11 is further connected with a test point TP53, the output end of the test point TP53 is connected with a plug connector J6, and the input end of the plug connector J6 is connected to the control pin of the MCU circuit.

6. The simplified motor drive PWM carrier based AC voltage monitoring device as claimed in claim 5, wherein said rectifier bridge diode D5 is GBJ2506 rectifier diode, rectifier bridge diode D5 is composed of four diodes, four diodes constitute a bridge full wave rectifier circuit, said thermistor R15 is PTC thermistor, and said relay K1 is HF32FV-G power relay.