CN111239469B - Impact signal detection circuit and alternating current power supply equipment - Google Patents
Impact signal detection circuit and alternating current power supply equipment Download PDFInfo
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- CN111239469B CN111239469B CN201811436296.6A CN201811436296A CN111239469B CN 111239469 B CN111239469 B CN 111239469B CN 201811436296 A CN201811436296 A CN 201811436296A CN 111239469 B CN111239469 B CN 111239469B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16504—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the components employed
- G01R19/16523—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the components employed using diodes, e.g. Zener diodes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/17—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values giving an indication of the number of times this occurs, i.e. multi-channel analysers
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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
- H02H3/20—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 excess voltage
Abstract
The invention provides an impact signal detection circuit and alternating current power supply equipment, wherein the impact signal detection circuit comprises: an alternating current power supply; the bridge rectifier unit is electrically connected with the alternating current power supply and is used for converting alternating current voltage of the alternating current power supply into half-wave voltage; the impact signal detection unit is electrically connected with the output end of the bridge rectifier unit and is used for collecting a fluctuation signal in half-wave voltage and detecting whether the voltage value of the fluctuation signal is greater than a preset voltage threshold value or not; and the control unit is electrically connected with the impact signal detection unit and used for determining whether to disconnect the alternating current power supply and/or the alternating current load module according to the detection result of the impact signal detection unit. According to the technical scheme, on one hand, the safety of alternating current power supply can be improved, and on the other hand, compared with the scheme of detecting the bus voltage of the capacitor in the prior art, the scheme has the advantages that the response is faster and the detection precision is higher by arranging the impact signal detection unit.
Description
Technical Field
The invention relates to the field of alternating current power supply equipment, in particular to an impact signal detection circuit and alternating current power supply equipment.
Background
Because the alternating voltage has a fluctuation phenomenon, a filter capacitor and an alternating load module in the circuit can be subjected to electric fluctuation impact for a long time, so that the filter capacitor fails due to overvoltage, and the alternating load module is burned out due to overvoltage.
Disclosure of Invention
In order to solve at least one of the above technical problems, an object of the present invention is to provide a surge signal detection circuit.
Another object of the present invention is to provide an ac power supply apparatus.
In order to achieve the above object, an embodiment of a first aspect of the present invention proposes a surge signal detection circuit, including: an alternating current power supply; the bridge rectifier unit is electrically connected with the alternating current power supply and is used for converting alternating current voltage of the alternating current power supply into half-wave voltage; the impact signal detection unit is electrically connected with the output end of the bridge rectifier unit and is used for collecting a fluctuation signal in half-wave voltage and detecting whether the voltage value of the fluctuation signal is greater than a preset voltage threshold value or not; and the control unit is electrically connected with the impact signal detection unit and used for determining whether to disconnect the alternating current power supply and/or the alternating current load module according to the detection result of the impact signal detection unit.
In the technical scheme, the impact signal detection unit is arranged to detect whether the impact signal occurs or not through a plurality of electronic devices arranged in the impact signal detection unit, specifically, a preset voltage threshold value can be set, the impact is determined to occur through detecting that the voltage value of the fluctuation signal is greater than the voltage threshold value, and further transmits the impact signal to the control unit, the control unit determines whether a voltage signal which is unstable and can cause impact to the load is generated through further signal detection, when the voltage signal is determined to appear, the alternating current power supply and/or the alternating current load module are controlled to be cut off in time, on one hand, the safety of alternating current power supply can be improved, on the other hand, through setting up impact signal detecting element, compare the scheme through detecting the busbar voltage to the electric capacity among the prior art, the response is faster, and the precision of detection is also higher.
The impulse signal refers to a current or voltage signal causing an impulse to the ac load module, and in this application, refers to a half-wave voltage signal when a voltage value is greater than a preset voltage threshold.
It can be understood by those skilled in the art that detecting whether the voltage value of the fluctuation signal is greater than the voltage threshold may be performed by directly collecting the voltage value of the fluctuation signal for output comparison, or may be performed by detecting a state change of the output current of the impulse signal detecting unit to determine whether the voltage value is greater than the preset voltage threshold.
The impulse signal detection circuit provided by the invention in the above embodiment may further have the following additional technical features:
in the above technical solution, preferably, the method further includes: and the filtering unit is electrically connected with the output end of the bridge rectifier unit and is used for filtering the fluctuation signal.
In the technical scheme, the filtering unit is arranged to carry out filtering operation on the fluctuating signal so as to reduce the probability of false detection of the pulse signal.
In any of the above technical solutions, preferably, the bridge rectifier unit includes: and the four diodes are arranged in a bridge structure, wherein a connecting end between the anode of the first diode and the cathode of the second diode is determined as a first input end, a connecting end between the cathode of the third diode and the anode of the fourth diode is determined as a second input end, a connecting end between the cathode of the first diode and the cathode of the fourth diode is determined as a first output end, and a connecting end between the anode of the second diode and the anode of the third diode is determined as a second output end.
In this technical scheme, convert alternating current power supply's alternating voltage into half-wave voltage through setting up bridge type bridge rectifier cell to confirm whether impact signal appears through sampling and the detection to half-wave voltage, thereby do not need directly to follow and sample on the busbar voltage, and then can promote alternating current power supply's security and the promptness to the alternating current protection.
In any one of the above technical solutions, preferably, the impact signal detection unit includes: the sampling subunit is used for acquiring the fluctuation signal and comprises: the sampling resistor comprises at least two series-connected voltage-dividing resistors, wherein one end of each of the at least two series-connected voltage-dividing resistors is connected to the first output end, and the zero end of each of the at least two series-connected voltage-dividing resistors is connected to the second output end, and one of the at least two series-connected voltage-dividing resistors is determined as the sampling resistor.
In the technical scheme, the sampling subunit is arranged to realize the collection of the fluctuation signal, and the sampling subunit comprises at least two divider resistors, and determines one of the divider resistors as the sampling resistor, so as to detect the fluctuation condition of the fluctuation signal through the collection of the voltages at the two ends of the sampling resistor.
The half-wave sorting unit is arranged, so that the sampling resistor can perform sampling at least once in a technical period and correspondingly form a pulse signal after being fed back to the control unit.
In any one of the above technical solutions, preferably, the impact signal detection unit further includes: a detection subunit comprising: the voltage stabilizing diode and the optical coupler are connected in series, the voltage stabilizing diode and the optical coupler are connected in parallel with the sampling resistor, and the optical coupler is electrically connected with the control unit.
In the technical scheme, the optical coupler is arranged, so that signal isolation between an input signal and an output signal in the impact signal detection unit is realized, and the anti-interference capability of the circuit is improved while accurate response is ensured.
In any of the above technical solutions, preferably, the at least two voltage dividing resistors connected in series include a first resistor and a second resistor, and the second resistor is determined as a sampling resistor; the anode of the voltage-stabilizing diode is connected to the second input end, the cathode of the voltage-stabilizing diode is connected with the cathode of a light emitter in the optical coupler, the anode of the light emitter is connected between the first resistor and the second resistor, the emitting stage of a light receiver in the optical coupler is grounded, the collector of the light receiver is connected to one end of the control unit and one end of the pull-up resistor respectively, and the other end of the pull-up resistor is connected to the direct-current power supply.
In any of the above technical solutions, preferably, when the voltage value of the fluctuation signal is greater than the preset voltage threshold, and the voltage at both ends of the sampling resistor is greater than the sum of the breakdown voltage of the zener diode and the conduction voltage drop of the light emitter, the zener diode is turned on, and the pull-up resistor is grounded to transmit a low level to the control unit; the control unit generates a primary overvoltage pulse signal according to the low level so as to determine whether to disconnect the alternating current power supply and/or the alternating current load module according to the number of the overvoltage pulse signals in one technical cycle.
In the technical scheme, a light emitter in an optical coupler is connected with a voltage stabilizing diode in series and then connected with a sampling resistor in parallel, when the voltage at two ends of the sampling resistor is greater than the sum of the breakdown voltage of the voltage stabilizing diode and the conduction voltage drop of the light emitter, the voltage stabilizing diode is conducted, at the moment, a pull-up resistor is pulled to the ground, a low-level pulse signal is output to a control unit, at least one low-level signal is output in an alternating current signal unit, and when the control unit detects that the number of the low-level pulse signals in a technical cycle reaches a preset number threshold value, an alternating current power supply and/or an alternating current load module are controlled to be disconnected, so that the rapid response to an impact signal is realized, and the safety of an electric appliance adopting the detection circuit can be improved.
In any of the above technical solutions, preferably, the method further includes: and the anode of the electrolytic capacitor is connected to the first output end, and the cathode of the electrolytic capacitor is connected to the second output end and grounded.
In the technical scheme, the electrolytic capacitor is arranged between the two output ends, the charging and discharging characteristics of the electrolytic capacitor can be utilized to change the rectified half-wave voltage into relatively stable direct current voltage,
in any one of the above technical solutions, preferably, the filtering unit includes: and the filter capacitor is connected with the sampling resistor in parallel.
In the technical scheme, the filtering function is realized by arranging the filtering capacitor, so that the sampling signal sampled by the sampling resistor can truly reflect the fluctuation condition of half-wave voltage generated after the alternating current power supply is rectified by the bridge rectifier unit, the interference is reduced, and the purpose of improving the detection precision of the impact signal is realized.
An embodiment of the second aspect of the present invention proposes an ac power supply apparatus including a surge signal detection circuit proposed in an embodiment of the first aspect of the present invention.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a schematic block diagram of a shock signal detection circuit according to one embodiment of the present invention;
FIG. 2 shows a circuit schematic of a shock signal detection circuit according to another embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
An impact signal detection circuit according to some embodiments of the present invention is described below with reference to fig. 1 and 2.
The first embodiment is as follows:
as shown in fig. 1 and 2, the impact signal detection circuit according to an embodiment of the present invention includes: an alternating current power supply 10; a bridge rectifier unit 20 electrically connected to the ac power supply 10, for converting an ac voltage of the ac power supply 10 into a half-wave voltage; the impact signal detection unit 30 is electrically connected with the output end of the bridge rectifier unit 20, and is used for collecting a fluctuation signal in half-wave voltage and detecting whether the voltage value of the fluctuation signal is greater than a preset voltage threshold value; and the control unit 50 is electrically connected with the impact signal detection unit 30 and is used for determining whether to disconnect the alternating current power supply 10 and/or the alternating current load module 60 according to the detection result of the impact signal detection unit 30.
In this embodiment, by providing the impulse signal detection unit 30 to detect whether an impulse signal occurs or not through a plurality of electronic devices provided in the impulse signal detection unit 30, specifically, a preset voltage threshold may be set, and it is determined that an impulse occurs by detecting that the voltage value of the fluctuation signal is greater than the voltage threshold, and then the impulse signal is transmitted to the control unit 50, and the control unit 50 determines whether a voltage signal that is unstable and may cause an impulse to the load through further signal detection, so as to timely control to switch off the ac power supply 10 and/or the ac load module 60 when determining that the voltage signal occurs, on one hand, the safety of ac power supply can be improved, and on the other hand, by providing the impulse signal detection unit 30, the response is faster compared with the prior art that a bus voltage through a capacitor is detected, the detection accuracy is also higher.
The control unit 50 may be specifically a control chip.
The impulse signal refers to a current or voltage signal causing an impulse to the ac load module 60, and in this application, refers to a half-wave voltage signal when the voltage value is greater than a preset voltage threshold.
It can be understood by those skilled in the art that the detection of whether the voltage value of the fluctuation signal is greater than the voltage threshold may be performed by directly collecting the voltage value of the fluctuation signal for output comparison, or may be performed by detecting a state change of the output current of the surge signal detection unit 30 to determine whether the voltage value is greater than the preset voltage threshold.
The impulse signal detection circuit provided by the invention in the above embodiment may further have the following additional technical features:
in the above embodiment, preferably, the method further includes: and the filtering unit 40 is electrically connected with the output end of the bridge rectifier unit 20 and is used for filtering the fluctuation signal.
In this embodiment, the filtering unit 40 is arranged to perform a filtering operation on the fluctuating signal to reduce the probability of false detection of the pulse signal.
In any of the above embodiments, preferably, the bridge rectifier unit 20 includes: four diodes arranged in a bridge configuration, wherein a connection terminal between an anode of the first diode 202 and a cathode of the second diode 204 is determined as a first input terminal, a connection terminal between a cathode of the third diode 206 and an anode of the fourth diode 208 is determined as a second input terminal, a connection terminal between a cathode of the first diode 202 and a cathode of the fourth diode 208 is determined as a first output terminal, and a connection terminal between an anode of the second diode 204 and an anode of the third diode 206 is determined as a second output terminal.
In this embodiment, the bridge rectifier unit 20 is arranged to convert the ac voltage of the ac power supply 10 into a half-wave voltage, so as to determine whether an impact signal occurs by sampling and detecting the half-wave voltage, thereby avoiding directly sampling from the bus voltage, and further improving the safety of the power supply of the ac power supply 10 and the timeliness of the ac protection.
In any of the above embodiments, preferably, the impact signal detection unit 30 includes: the sampling subunit is used for collecting the fluctuation signal and comprises: the sampling resistor comprises at least two series-connected voltage-dividing resistors, wherein one end of each of the at least two series-connected voltage-dividing resistors is connected to the first output end, and the zero end of each of the at least two series-connected voltage-dividing resistors is connected to the second output end, and one of the at least two series-connected voltage-dividing resistors is determined as the sampling resistor.
In this embodiment, a sampling subunit is provided to realize the collection of the fluctuation signal, and the sampling subunit includes at least two voltage-dividing resistors, and determines one of the voltage-dividing resistors as a sampling resistor, so as to detect the fluctuation condition of the fluctuation signal through the collection of the voltages at the two ends of the sampling resistor.
The half-wave arrangement unit is arranged, so that the sampling resistor can perform at least one sampling in one technical period, and a pulse signal is correspondingly formed after the sampling resistor is fed back to the control unit 50.
In any of the above embodiments, preferably, the impact signal detection unit 30 further includes: a detection subunit comprising: the series-connected zener diode 306 and the optical coupler 308 are connected in parallel, the series-connected zener diode 306 and the optical coupler 308 are connected in parallel with the sampling resistor, and the optical coupler 308 is electrically connected with the control unit 50.
In this embodiment, by providing the optical coupler 308, signal isolation between the input signal and the output signal in the impulse signal detection unit 30 is achieved, and the anti-interference capability of the circuit is improved while the accurate response is ensured.
In any of the above embodiments, preferably, the at least two serially connected voltage dividing resistors include a first resistor 302 and a second resistor 304, and the second resistor 304 is determined as a sampling resistor; the anode of the zener diode 306 is connected to the second input terminal, the cathode of the zener diode 306 is connected to the cathode of the light emitter in the optical coupler 308, the anode of the light emitter is connected between the first resistor 302 and the second resistor 304, the emitting stage of the light receiver in the optical coupler 308 is grounded, the collector of the light receiver is connected to the control unit 50 and one end of the pull-up resistor 310, respectively, and the other end of the pull-up resistor 310 is connected to the dc power supply.
In any of the above embodiments, preferably, when the voltage value of the fluctuation signal is greater than the preset voltage threshold, and the voltage across the sampling resistor is greater than the sum of the breakdown voltage of the zener diode 306 and the conduction voltage drop of the light emitter, the zener diode 306 is turned on, and the pull-up resistor 310 is grounded to supply a low level to the control unit 50; the control unit 50 generates the primary overvoltage pulse signal according to the low level to determine whether to disconnect the ac power source 10 and/or the ac load module 60 according to the number of the overvoltage pulse signals within one technology cycle.
In this embodiment, the light emitter and the zener diode 306 in the optical coupler 308 are connected in series and then connected in parallel with the sampling resistor, when the voltage across the sampling resistor is greater than the sum of the breakdown voltage of the zener diode 306 and the conduction voltage drop of the light emitter, the zener diode 306 is turned on, and at this time, the pull-up resistor 310 is pulled to the ground, and outputs a low-level pulse signal to the control unit 50, and in an ac signal unit, at least one low-level signal is output, and when the control unit 50 detects that the number of low-level pulse signals in one technical cycle reaches a preset number threshold, the ac power supply 10 and/or the ac load module 60 are controlled to be turned off, so as to implement a fast response to the impact signal, thereby being able to improve the safety of an electrical appliance adopting the detection circuit.
In any of the above embodiments, preferably, the method further includes: and an anode of the electrolytic capacitor 404 is connected to the first output end, and a cathode of the electrolytic capacitor 404 is connected to the second output end and grounded.
In this embodiment, by providing the electrolytic capacitor 404 between the two output terminals, the rectified half-wave voltage can be converted into a relatively stable dc voltage by utilizing the charge/discharge characteristics of the electrolytic capacitor 404,
in any of the above embodiments, preferably, the filtering unit 40 includes: and a filter capacitor 402 arranged in parallel with the sampling resistor.
In this embodiment, the filtering function is realized by providing the filtering capacitor 402, so that the sampling signal sampled by the sampling resistor can truly reflect the fluctuation condition of the half-wave voltage generated after the alternating current power supply 10 is rectified by the bridge rectifier unit 20, thereby achieving the purposes of reducing interference and improving the detection precision of the impact signal.
The second embodiment:
as shown in fig. 2, the impact signal detection circuit includes: the first diode 202, the second diode 204, the third diode 206, and the fourth diode 208 constitute a bridge rectifier circuit.
The first resistor 302 is connected in series with the second resistor 304, one end of the series connection is connected to the cathode of the first diode 202, and the other end of the series connection is connected to the cathode of the third diode 206 to form a voltage division sampling circuit, and the second resistor 304 is determined as a sampling resistor.
The filter capacitor 402 is connected in parallel with the second resistor 304 to perform a filtering function.
The anode of the zener diode 306 is connected to the cathode of the third diode 206, the cathode of the zener diode 306 is connected to the cathode of the diode (i.e., the light emitter) inside the optical coupler 308, the anode of the diode inside the optical coupler 308 is connected to the connection point between the first resistor 302 and the second resistor 304, the emitter of the secondary (i.e., the light receiver) of the optical coupler 308 is connected to the signal ground, the collector of the secondary of the optical coupler 308 is connected to the main chip interface and the pull-up resistor 310, and the other end of the pull-up resistor 310 is connected to the power supply VDD.
The anode of the electrolytic capacitor 404 is connected to the cathode of the first diode 202, and the cathode of the electrolytic capacitor 404 is strongly connected to the connection point of the second and third diodes 206.
When the half-wave voltage of the alternating current input is overvoltage, the voltage at two ends of the second resistor 304 exceeds the breakdown voltage of the voltage stabilizing diode 306 and the conduction voltage drop of the diode in the optical coupler 308, the voltage stabilizing diode 306 is conducted, the diode in the optical coupler 308 is conducted, the third resistor is pulled to the ground, a low level is output to the interface of the main chip, the main control unit counts a primary overvoltage pulse signal, and accordingly, the main control unit controls the on and off of the power supply and the alternating current load module 60 according to the number of low level pulses in a counting period.
According to the ac power supply device of the embodiment of the present invention, since the impact signal detection circuit described in any of the above embodiments is provided, all the beneficial effects of the impact signal detection circuit are achieved, and details are not repeated herein.
In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. An impulse signal detection circuit, comprising:
an alternating current power supply;
the bridge rectifier unit is electrically connected with the alternating current power supply and is used for converting alternating current voltage of the alternating current power supply into half-wave voltage;
the impact signal detection unit is electrically connected with the output end of the bridge rectifier unit and is used for collecting a fluctuation signal in the half-wave voltage and detecting whether the voltage value of the fluctuation signal is greater than a preset voltage threshold value or not;
the control unit is electrically connected with the impact signal detection unit and used for determining whether to disconnect the alternating current power supply and/or the alternating current load module according to the detection result of the impact signal detection unit;
and the filtering unit is electrically connected with the output end of the bridge rectifier unit and is used for filtering the fluctuation signal.
2. The surge signal detection circuit according to claim 1, wherein the bridge rectifier unit comprises:
four diodes are arranged in a bridge structure,
the connection end between the anode of the first diode and the cathode of the second diode is determined as a first input end, the connection end between the cathode of the third diode and the anode of the fourth diode is determined as a second input end, the connection end between the cathode of the first diode and the cathode of the fourth diode is determined as a first output end, and the connection end between the anode of the second diode and the anode of the third diode is determined as a second output end.
3. The impact signal detection circuit according to claim 2, wherein the impact signal detection unit includes:
the sampling subunit is used for collecting the fluctuation signal and comprises:
at least two series-connected voltage-dividing resistors, one end of each of the at least two series-connected voltage-dividing resistors being connected to the first output terminal, and a zero end of each of the at least two series-connected voltage-dividing resistors being connected to the second output terminal,
wherein one of the at least two series-connected voltage dividing resistors is determined as a sampling resistor.
4. The impact signal detection circuit according to claim 3, wherein the impact signal detection unit further comprises:
a detection subunit comprising:
the sampling resistor is connected with the sampling resistor through the sampling resistor, and the sampling resistor is connected with the sampling resistor through the sampling resistor.
5. The impact signal detection circuit according to claim 4,
the at least two series-connected voltage-dividing resistors comprise a first resistor and a second resistor, and the second resistor is determined as the sampling resistor;
the anode of the voltage stabilizing diode is connected to the second input end, the cathode of the voltage stabilizing diode is connected with the cathode of a light emitter in the optical coupler, the anode of the light emitter is connected between the first resistor and the second resistor, the emitting stage of a light receiver in the optical coupler is grounded, the collector of the light receiver is connected to one end of the control unit and one end of a pull-up resistor respectively, and the other end of the pull-up resistor is connected to a direct-current power supply.
6. The impact signal detection circuit according to claim 5,
when the voltage value of the fluctuation signal is greater than a preset voltage threshold value, and the voltage at two ends of the sampling resistor is greater than the sum of the breakdown voltage of the voltage-stabilizing diode and the conduction voltage drop of the light emitter, the voltage-stabilizing diode is conducted, and the pull-up resistor is grounded so as to transmit a low level to the control unit;
the control unit generates primary overvoltage pulse signals according to the low level so as to determine whether to disconnect the alternating current power supply and/or the alternating current load module according to the number of the overvoltage pulse signals in one technical cycle.
7. The impact signal detection circuit according to any one of claims 2 to 6, wherein the filter unit includes:
and the anode of the electrolytic capacitor is connected to the first output end, and the cathode of the electrolytic capacitor is connected to the second output end and grounded.
8. The impact signal detection circuit according to any one of claims 3 to 6, wherein the filter unit further includes:
and the filter capacitor is connected with the sampling resistor in parallel.
9. An alternating current power supply apparatus, comprising:
the impact signal detection circuit of any one of claims 1 to 8.
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| CN201811436296.6A CN111239469B (en) | 2018-11-28 | 2018-11-28 | Impact signal detection circuit and alternating current power supply equipment |
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| CN201811436296.6A CN111239469B (en) | 2018-11-28 | 2018-11-28 | Impact signal detection circuit and alternating current power supply equipment |
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| CN112103922B (en) * | 2020-08-13 | 2021-10-08 | 珠海格力电器股份有限公司 | Power supply protection device, method and driver |
| CN116184019B (en) * | 2022-12-14 | 2023-12-08 | 广州市均能科技有限公司 | Harmonic detection system, method and device for alternating current |
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