CN111090055A - Abnormal power failure detection circuit and method - Google Patents
Abnormal power failure detection circuit and method Download PDFInfo
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- CN111090055A CN111090055A CN201911382046.3A CN201911382046A CN111090055A CN 111090055 A CN111090055 A CN 111090055A CN 201911382046 A CN201911382046 A CN 201911382046A CN 111090055 A CN111090055 A CN 111090055A
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- power supply
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- 238000001514 detection method Methods 0.000 title claims abstract description 76
- 230000002159 abnormal effect Effects 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title abstract description 11
- 238000005070 sampling Methods 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005465 channeling Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
- G01R31/42—AC power supplies
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
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Abstract
The invention discloses an abnormal power failure detection circuit and a method thereof, wherein the abnormal power failure detection circuit comprises: the detection circuit is provided with a detection module for detecting the actual frequency of the alternating current power supply line, the detection module judges whether the alternating current power supply line is abnormally powered off according to the actual frequency, if the shutdown instruction is not received and f =0 is adopted, the alternating current power supply line is judged to be abnormally powered off, and if the shutdown instruction is not received and f is not in the normal frequency range f0If so, it is determined that the AC power supply line is abnormally interrupted. The invention can quickly detect whether the AC power supply is abnormally powered off, is convenient for accurately carrying out power-off shutdown operation and effectively protects the electrical appliance.
Description
Technical Field
The invention relates to the technical field of detection circuits, in particular to an abnormal power failure detection circuit and method.
Background
Along with the improvement of the living quality requirement of people, the idea of comfortable life is deep in mind, the safety of household appliances is the basis of the comfortable life, and the air conditioner is one of electric appliances widely used in families, can bring good effect in the aspect of refrigeration, and can bring convenience to the life of people in the aspects of heating, hot water and the like.
In the prior art, a large number of detection methods related to air conditioner faults exist, but a scheme for accurately judging whether an alternating current power supply of an air conditioner is abnormally powered off does not exist at present, and because the air conditioner is frequently used, if the air conditioner is abnormally powered off in the running process, the air conditioner is possibly abnormal in operation, so that accidents or parts are damaged, and particularly when the abnormal power supply is abnormally powered off in working hours or outgoing hours, more serious consequences are possibly caused.
Therefore, how to design a detection circuit and a method capable of rapidly determining abnormal power failure is an urgent technical problem to be solved in the industry.
Disclosure of Invention
The invention provides an abnormal power failure detection circuit and method, aiming at solving the defect that the prior art can not detect abnormal power failure of an alternating current power supply.
The technical scheme adopted by the invention is that the abnormal power failure detection circuit is designed, and comprises the following components: the detection circuit is provided with a detection module for detecting the actual frequency of the AC power supply line, and the detection module judges whether the AC power supply line is abnormally powered off according to the actual frequency.
Preferably, the detection module cuts off power supply to the ac power supply line after determining abnormal power failure of the ac power supply line.
Preferably, the detection circuit comprises a current-limiting resistor and an optocoupler, a light-emitting diode of the optocoupler is connected to an alternating current power supply line through the current-limiting resistor, and the detection module is connected in parallel with two ends of a photosensitive triode of the optocoupler.
Preferably, the current limiting resistor includes: the resistor R1, the resistor R2 and the resistor R3 are connected in series to an AC power supply line, and the light emitting diode is connected in parallel to both ends of the resistor R3.
Preferably, the detection circuit further includes: and a reverse diode VD connected with the two ends of the resistor R3, wherein the reverse diode VD is opposite to the direction of the light-emitting diode.
Preferably, the detection circuit further includes: resistance R4 and resistance R5, resistance R4's one end direct current voltage, the other end connects sampling resistance R5 ground connection in series, and the phototriode of opto-coupler, sampling resistance R5 and the detection module set up in parallel.
Preferably, the inertial reverse charging circuit comprises a load provided with an electric motor, the alternating current supply line supplying power to the load.
The invention also provides an abnormal power failure detection method using the abnormal power failure detection circuit, which comprises the following steps: detecting the actual frequency f of the AC power supply line, determining whether the actual frequency f is 0 and/or determining whether the actual frequency f is in the normal frequency range f0Internal; if the shutdown instruction is not received and f =0, judging that the alternating current power supply line is abnormally powered off; if the shutdown instruction is not received and f is not equal to f0If so, it is determined that the AC power supply line is abnormally interrupted.
Preferably, the detection method comprises: firstly, determining whether the actual frequency f is 0, if f is not equal to 0, then determining whether the actual frequency f is in the normal frequency range f0If f = f0Then the actual frequency f of the ac supply line is detected back.
Preferably, the power supply to the ac power supply line is cut off after the ac power supply line is determined to be abnormally interrupted.
Compared with the prior art, the method and the device have the advantages that the actual frequency of the alternating current power supply line is detected through the detection module, whether the alternating current power supply line is abnormally powered off or not is rapidly judged according to the actual frequency, and the problem that the abnormal power off of the alternating current power supply cannot be detected in the prior art is solved. Further, compare actual frequency and normal frequency value, solve the unusual outage back of alternating current power supply line because motor inertia leads to detection module to detect wrong problem to in the accuracy shut down operation of cutting off the power supply, prevent that the electrical apparatus at load place from damaging.
Drawings
The invention is described in detail below with reference to examples and figures, in which:
FIG. 1 is a schematic diagram of an abnormal power outage detection circuit according to the present invention;
FIG. 2 is a schematic diagram showing a detection level waveform of the detection device before and after abnormal power outage in the present invention;
FIG. 3 is a flow chart of the abnormal power outage detection method according to the present invention.
Detailed Description
As shown in fig. 1, the present invention provides an abnormal power failure detection circuit, including: the detection circuit and the inertia reverse charging circuit are connected on an alternating current power supply line in parallel, the inertia reverse charging circuit comprises a load, the load is provided with a motor, the alternating current power supply line supplies power to the load, and after abnormal power failure, the motor can continue to operate for a period of time due to inertia, and reversely charges the alternating current power supply line. In the embodiment provided in fig. 1, the ac supply line supplies power to the load via the rectifier module and the inverter module. It should be noted that the load is mainly a fan and a compressor, and of course, the load may also be other components having inertia reverse charging performance, and the present invention is not limited thereto.
The detection circuit is provided with a detection module for detecting the actual frequency of the alternating current power supply line, the detection module judges whether the alternating current power supply line is abnormally powered off or not according to the actual frequency, and the power supply of the alternating current power supply line is cut off when the alternating current power supply line is judged to be abnormally powered off, so that the abnormal operation of an electric appliance where a load is located is prevented, and the effect of protecting the electric appliance is achieved.
As shown in fig. 1, the detailed circuit structure of the detection circuit is as follows, the detection circuit includes a current-limiting resistor, an optocoupler and the like, a light emitting diode of the optocoupler is connected to an ac power supply line through the current-limiting resistor, the detection module is connected in parallel at two ends of a phototriode of the optocoupler, one end of a resistor R4 is connected to a 3.3V dc voltage, the other end is connected in series with a sampling resistor R5 and is grounded, and the phototriode of the optocoupler, the sampling resistor R5 and the detection module.
The current limiting resistor includes: the LED is connected in series with a resistor R1, a resistor R2 and a resistor R3 on an alternating current power supply line, the LED is connected in parallel with two ends of the resistor R3, and the current limiting resistor is arranged to reduce the current passing through the LED so as to protect the LED. Preferably, the two ends of the resistor R3 are also connected in parallel with a reverse diode VD, the reverse diode VD is opposite to the light emitting diode in direction, and the reverse diode VD plays a role of follow current protection to prevent high voltage from channeling, thereby further protecting the light emitting diode.
The detection process of the detection circuit is as follows, when the AC power supply line is in normal power supply, the input frequency range of the live wire L is f0Of the sine wave signal of f0The sine wave signal is converted into a high-low level signal with the same frequency through an optical coupler, a light emitting diode is conducted in the positive half cycle of the sine wave, a photosensitive triode is conducted at the same time, and the detection module detects the low level signal; and in the negative half cycle of the sine wave, the light emitting diode is turned off, the reverse diode VD is turned on, the photosensitive diode is turned off, and the detection module detects a high level signal at the moment. As shown in fig. 2, when the ac power supply line is abnormally powered off at time t1, the input signal of the live line L suddenly disappears, but the motor in the load continues to run for a while until it stops due to inertia, and this process motor will be used as a generator to supply power to the ac power supply line, the process is exactly opposite to the ac power supply line, the frequency is the ratio of the number of the poles of the motor to the number of the pole pairs, and then the frequency gradually decays to 0, so the detection module at this time detects high and low level signals with the frequency decaying from high to 0, and the detection module detects the high and low level signals and calculates the actual frequency f.
Based on the detection circuit, the invention provides an abnormal power failure detection method, which comprises the following steps: detecting the actual frequency f of the AC power supply line, determining whether the actual frequency f is 0 and/or determining whether the actual frequency f is in the normal frequency range f0Internal; if the shutdown instruction is not received and f =0, judging that the alternating current power supply line is abnormally powered off; if the shutdown instruction is not received and f is not equal to f0If so, it is determined that the AC power supply line is abnormally interrupted. It should be noted that, when the electrical appliance where the detection circuit is located does not receive the shutdown instruction, the electrical appliance is in a working state, and the detection circuit isAnd when the electrical appliance receives a shutdown instruction, the switch between the alternating current power supply line and the power supply is cut off, and the electrical appliance enters a power-off shutdown state.
As shown in fig. 3, in the preferred embodiment, it is determined whether the actual frequency f is 0, and if the shutdown command is not received and f =0 is received, it is determined that the ac power supply line is abnormally powered off and the power supply to the ac power supply line is cut off, and if f ≠ 0, it is determined whether the actual frequency f is within the normal frequency range f0If f = f0If f =0 and the shutdown command is not received, it is determined that the ac power supply line is abnormally powered off and the power supply to the ac power supply line is cut off. Where f ≠ f0Indicates that f is not in the normal frequency range f0Inner, f = f0Denotes that f is in the normal frequency range f0And (4) the following steps.
The abnormal power failure detection circuit can be used in an air conditioner, and the air conditioner detects whether the power supply of the alternating current power supply line is abnormally powered off or not by adopting the abnormal power failure detection method when in work.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. An abnormal power failure detection circuit, comprising: the detection circuit is provided with a detection module for detecting the actual frequency of the alternating current power supply line, and the detection module judges whether the alternating current power supply line is abnormally powered off according to the actual frequency.
2. The abnormal power outage detection circuit according to claim 1, wherein the detection module cuts off power to the ac power supply line after determining that the ac power supply line is abnormally powered off.
3. The abnormal power failure detection circuit of claim 1, wherein the detection circuit comprises: a current limiting resistor and an optical coupler; the light emitting diode of the optical coupler is connected to the alternating current power supply line through a current limiting resistor, and the detection module is connected to two ends of the photosensitive triode of the optical coupler in parallel.
4. The abnormal power failure detection circuit of claim 3, wherein the current limiting resistor comprises: the resistor R1, the resistor R2 and the resistor R3 are connected in series to the AC power supply line, and the light emitting diode is connected in parallel to both ends of the resistor R3.
5. The abnormal power failure detection circuit of claim 4, wherein the detection circuit further comprises: and a backward diode VD connected to two ends of the resistor R3, wherein the backward diode VD is opposite to the direction of the light emitting diode.
6. The abnormal power failure detection circuit of claim 3, wherein the detection circuit further comprises: resistance R4 and resistance R5, resistance R4's one end direct current voltage, the other end series connection sampling resistance R5 ground connection, the phototriode of opto-coupler the sampling resistance R5 reaches detection module parallel arrangement.
7. The abnormal power failure detection circuit according to any one of claims 1 to 6, wherein the inertial reverse charging circuit includes a load provided with a motor, and the AC power supply line supplies power to the load.
8. The abnormal power failure detection method is characterized in that a detection circuit and an inertia reverse charging circuit are connected on an alternating current power supply line in parallel, and a detection module for detecting the actual frequency of the alternating current power supply line is arranged in the detection circuit;
the detection method comprises the following steps: detecting the actual frequency f of the AC power supply line, judging whether the actual frequency f is 0 and/or judging whether the actual frequency f is in a normal frequency range f0Internal;
if a shutdown command is not received and f =0, determining that the alternating current power supply line is abnormally powered off;
if the shutdown instruction is not received and f is not equal to f0And judging that the AC power supply line is abnormally powered off.
9. The abnormal power outage detection method according to claim 8, wherein the detection method includes: firstly, judging whether the actual frequency f is 0, if f is not equal to 0, then judging whether the actual frequency f is in a normal frequency range f0If f = f0Then the actual frequency f of the ac supply line is detected back.
10. The abnormal power outage detection method according to claim 8 or 9, characterized in that after it is determined that the ac power supply line is abnormally powered off, the power supply to the ac power supply line is cut off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911382046.3A CN111090055A (en) | 2019-12-27 | 2019-12-27 | Abnormal power failure detection circuit and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911382046.3A CN111090055A (en) | 2019-12-27 | 2019-12-27 | Abnormal power failure detection circuit and method |
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| CN111090055A true CN111090055A (en) | 2020-05-01 |
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| CN201911382046.3A Pending CN111090055A (en) | 2019-12-27 | 2019-12-27 | Abnormal power failure detection circuit and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112023208A (en) * | 2020-09-03 | 2020-12-04 | 合肥康居人智能科技有限公司 | Intelligent oxygen-making and breathing integrated robot control system and use method thereof |
| CN112578837A (en) * | 2020-12-07 | 2021-03-30 | 四川富肯斯科技有限公司 | Output voltage linear regulation circuit, method and device |
| CN113138720A (en) * | 2021-04-29 | 2021-07-20 | 群联电子股份有限公司 | Data storage method, memory control circuit unit and memory storage device |
| CN114229638A (en) * | 2021-11-10 | 2022-03-25 | 淮北矿业股份有限公司 | Mine hoist safety circuit instant open circuit fault capture circuit |
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2019
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112023208A (en) * | 2020-09-03 | 2020-12-04 | 合肥康居人智能科技有限公司 | Intelligent oxygen-making and breathing integrated robot control system and use method thereof |
| CN112578837A (en) * | 2020-12-07 | 2021-03-30 | 四川富肯斯科技有限公司 | Output voltage linear regulation circuit, method and device |
| CN113138720A (en) * | 2021-04-29 | 2021-07-20 | 群联电子股份有限公司 | Data storage method, memory control circuit unit and memory storage device |
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| CN114229638A (en) * | 2021-11-10 | 2022-03-25 | 淮北矿业股份有限公司 | Mine hoist safety circuit instant open circuit fault capture circuit |
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