CN111426871A - Overvoltage indicating circuit, overvoltage indicating method and household appliance - Google Patents
Overvoltage indicating circuit, overvoltage indicating method and household appliance Download PDFInfo
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- CN111426871A CN111426871A CN202010311587.3A CN202010311587A CN111426871A CN 111426871 A CN111426871 A CN 111426871A CN 202010311587 A CN202010311587 A CN 202010311587A CN 111426871 A CN111426871 A CN 111426871A
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- overvoltage
- circuit
- alternating current
- power supply
- voltage
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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
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
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- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses an overvoltage indicating circuit, an overvoltage indicator and a household appliance. The overvoltage indicating circuit comprises a first indicating circuit and a voltage detecting circuit; the first indicating circuit comprises an overvoltage indicating lamp which is electrically connected in series, a first end of the overvoltage indicating lamp is electrically connected with a live wire of the alternating current power supply through a second current-limiting resistor, and a second end of the overvoltage indicating lamp is electrically connected with a zero line of the alternating current power supply through a controllable element; the voltage detection circuit comprises a bidirectional trigger diode, wherein a first end of the bidirectional trigger diode is electrically connected with a live wire of the alternating current power supply through a first current-limiting resistor, and a second end of the bidirectional trigger diode is electrically connected with a control end of the controllable element; when the alternating voltage reaches or exceeds an overvoltage threshold value, the bidirectional trigger diode is conducted to trigger the controllable element to conduct, so that the overvoltage indicator lamp is electrified and lightened to indicate that the alternating voltage of the alternating current power supply has overvoltage. The invention has the advantages of simple circuit structure, low realization cost, stability, reliability and the like.
Description
Technical Field
The invention relates to an overvoltage detection technology, in particular to an overvoltage indicating circuit, an overvoltage indicating method and a household appliance with the overvoltage indicating circuit.
Background
This section merely provides background information related to the present application so as to enable those skilled in the art to more fully and accurately understand the present application, which is not necessarily prior art.
Electronic equipment such as household appliances generally provides a voltage detection function to detect whether the used voltage is too high, and the voltage detection result is visually reflected through an indicator lamp, and particularly, the electronic equipment reminds a user of the use safety of the electronic equipment when the used voltage is too high.
As shown in fig. 1, in the prior art, a single chip microcomputer is mostly used for overvoltage detection, and a detection result is indicated through an indicator light. Specifically, an overvoltage indicating circuit is arranged in a power supply circuit of an alternating current power supply for a power utilization circuit, and the overvoltage indicating circuit comprises an AC-DC power supply circuit 11 connected with the power utilization circuit in parallel, a single chip microcomputer 12 electrically connected with the output end of the AC-DC power supply circuit 11, a voltage detection circuit 13 electrically connected between the input end of the AC-DC power supply circuit 11 and one data port of the single chip microcomputer 12, a work indicating circuit 14 and an overvoltage indicating circuit 15 which are respectively and electrically connected with a first control port and a second control port of the single chip microcomputer 12. In the process of supplying power to the power utilization circuit by the alternating current power supply, the alternating current is converted into direct current by the AC-DC power supply circuit 11 to be used as a direct current power supply of the single chip microcomputer 12, the alternating current provided for the power utilization circuit is sampled by the voltage detection circuit 13 and then provided to one data port of the single chip microcomputer 12, the single chip microcomputer 12 judges whether the alternating current provided for the power utilization circuit has overhigh voltage, if the voltage is normal, the first control port of the single chip microcomputer 12 outputs a first level and the second control port outputs a second level so as to enable the work indicator lamp in the work indicator circuit 14 to be lightened, otherwise, if the single chip microcomputer 12 judges that the voltage is overhigh, the first control port outputs the second level and the second control port outputs the first level so as to enable the overvoltage indicator lamp in the overvoltage indicator circuit 15 to be lightened.
Although the prior art can accurately detect whether overvoltage exists in the alternating current supplied to the power utilization circuit by utilizing the matching of the single chip microcomputer 12 and the voltage detection circuit 13, the prior art depends on the realization of the single chip microcomputer or a similar controller, the required circuit modules are more, the circuit is more complex, and the overall realization cost is higher.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides an overvoltage indicating circuit, an overvoltage indicating method and a household appliance with the overvoltage indicating circuit, and the circuit is simple in structure and stable and reliable in operation.
The invention also provides an overvoltage indicating circuit, which comprises a first indicating circuit and a voltage detecting circuit; the first indicating circuit comprises an overvoltage indicating lamp which is electrically connected in series, a first end of the overvoltage indicating lamp is electrically connected with a live wire of the alternating current power supply through a second current-limiting resistor, and a second end of the overvoltage indicating lamp is electrically connected with a zero line of the alternating current power supply through a controllable element; the voltage detection circuit comprises a bidirectional trigger diode, wherein a first end of the bidirectional trigger diode is electrically connected with a live wire of the alternating current power supply through a first current-limiting resistor, and a second end of the bidirectional trigger diode is electrically connected with a control end of the controllable element; the forward breakover voltage of the bidirectional trigger diode is matched with the overvoltage threshold of the alternating current power supply, and only when the alternating current voltage reaches or exceeds the overvoltage threshold, the bidirectional trigger diode is conducted to trigger the controllable element to be conducted, so that the overvoltage indicator lamp is electrified and lightened to indicate that the alternating current voltage of the alternating current power supply has overvoltage.
In a preferred embodiment, the voltage indicator circuit further comprises a second indicator circuit, the second indicator circuit comprises an operation indicator light, a first end of the operation indicator light is electrically connected with the live wire of the alternating current power supply through a third current limiting resistor, and a second end of the operation indicator light is electrically connected with the zero wire of the alternating current power supply.
In a preferred embodiment, the over-voltage indicator light and the operation indicator light are both neon lights.
In a preferred embodiment, the controllable element is a thyristor.
In a preferred embodiment, the thyristor is a triac.
In a preferred embodiment, the controllable element is a transistor, and the gate, the source and the drain of the transistor are electrically connected with the diac, the overvoltage indicator lamp and the zero line of the alternating current power supply respectively.
The invention discloses a household appliance, which comprises an alternating current power supply, a power utilization circuit powered by the alternating current power supply and an overvoltage indicating circuit connected with the power utilization circuit in parallel.
The invention discloses an overvoltage indication method, which comprises the following steps: setting the forward breakover voltage of the bidirectional trigger diode to be matched with the overvoltage threshold of the alternating-current power supply; a controllable element connected with the overvoltage indicating lamp in a series connection mode is controlled by a bidirectional trigger diode; only when the alternating voltage provided by the alternating current power supply to the circuit reaches or exceeds the overvoltage threshold value, the bidirectional trigger diode is conducted to trigger the controllable element to conduct, so that the overvoltage indicator lamp is powered on to indicate that the alternating voltage provided by the alternating current power supply to the circuit has overvoltage.
In a preferred embodiment, the overvoltage indication method further comprises: an operation indicator lamp is provided to indicate whether the ac power source has an output ac voltage.
In a preferred embodiment, the controllable element is a thyristor or a transistor.
Compared with the prior art, the invention has the following beneficial effects:
the overvoltage indicating circuit detects whether an alternating current power supply has overvoltage through the bidirectional trigger diode, and the bidirectional trigger diode controls and triggers the controllable element which is electrically connected in series with the overvoltage indicating lamp, so that the whole circuit structure is very simple; in addition, the invention does not need to use controllers such as a singlechip and the like, does not need to carry out programming processing similar to the controllers on the circuit, and does not have the problem that the controllers such as the singlechip and the like are easily damaged by factors such as static electricity and the like, thereby reducing the realization cost and the realization difficulty compared with the prior art, being beneficial to improving the integral reliability and the service life of the circuit.
Drawings
Fig. 1 is a schematic block diagram of a circuit for detecting overvoltage by using a single chip microcomputer in the prior art.
Fig. 2 is a circuit schematic of the disclosed overvoltage indication circuit.
Fig. 3 is an equivalent circuit diagram of the overvoltage indication circuit when the diac DB is in a cut-off state.
Fig. 4 is an equivalent circuit diagram of the overvoltage indication circuit when the diac DB is in a conducting state.
Detailed Description
To further clarify the technical solutions and effects adopted by the present application to achieve the intended purpose, the following detailed description is given with reference to the accompanying drawings and preferred embodiments according to the present application. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
As shown in fig. 2, in a household electric appliance, an alternating current power supply (for example, 220V alternating current) supplies power to a power utilization circuit, an overvoltage indicating circuit 2 is arranged in parallel with the power utilization circuit, and the overvoltage indicating circuit 2 indicates whether the alternating current power supply supplied to the power utilization circuit is overvoltage or not.
Specifically, the over-voltage indicating circuit 2 comprises a first indicating circuit and a voltage detecting circuit, wherein the first indicating circuit comprises an over-voltage indicator lamp N1 (generally adopting a neon lamp) which is electrically connected in series, a first end of the over-voltage indicator lamp N1 is electrically connected with a live wire (AC _ L) of an alternating current power supply through a second current limiting resistor R2, a second end of the over-voltage indicator lamp N1 is electrically connected with a zero wire (AC _ N) of the alternating current power supply through a controllable element, the voltage detecting circuit comprises a bidirectional trigger diode DB, a first end of the bidirectional trigger diode DB is electrically connected with a live wire (AC _ L) of the alternating current power supply through a first current limiting resistor R1, and a second end of the bidirectional trigger diode DB is electrically connected with a control end of the controllable element.
Of course, in order to more intuitively indicate that the AC power source is supplying power to the power utilization circuit, the voltage indicating circuit 2 further comprises a second indicating circuit, the second indicating circuit comprises an operation indicator N2 (generally a neon lamp), a first end of the operation indicator N2 is electrically connected to the live wire (AC _ L) of the AC power source through a third current-limiting resistor R3, and a second end of the operation indicator N2 is electrically connected to the zero wire (AC _ N) of the AC power source, so that the operation indicator N2 is lighted to indicate that the AC power source is normally supplying power to the power utilization circuit regardless of whether the AC power source has overvoltage or not as long as the AC power source is normally supplying power to the power utilization circuit, and the operation indicator N2 is not lighted when the power supply path between the AC power source and the power utilization circuit is disconnected.
Therefore, the overvoltage threshold of the alternating current power supply is determined according to the working voltage required by the power utilization circuit, and the forward breakover voltage of the diac DB is selected to be matched with the overvoltage threshold. For example, if the required operating voltage of the power circuit is 50V and the overvoltage threshold is determined to be 60V, the diac DB having a forward breakover voltage value of 60V may be selected. As another example. The required working voltage of the power utilization circuit is 220V, and the over-voltage threshold is determined to be 250V, then the bidirectional trigger diode DB with the forward breakover voltage value of 250V can be selected.
In one embodiment, the controllable element is a Silicon Controlled Rectifier (SCR), and the Silicon Controlled Rectifier (SCR) is preferably a bidirectional SCR.
Of course, the controllable element may also be another component. For example, the controllable element is a transistor, and the gate, the source and the drain of the transistor are electrically connected to the diac DB, the overvoltage indicator N1 and the zero line of the ac power source, respectively.
The following controllable element is a silicon controlled SCR as an example to further explain the working principle of the overvoltage indicating circuit disclosed by the invention.
When the alternating voltage supplied by the alternating current power supply to the circuit does not exceed the overvoltage threshold, that is, the alternating current power supply does not generate overvoltage, at this time, the alternating voltage of the alternating current power supply is lower than the forward transition voltage of the diac DB, so that the diac DB is in an off state, the silicon controlled rectifier SCR is not conducted and keeps in the off state, and the overvoltage indicator lamp N1 cannot be powered on to be lit, that is, the overvoltage indicator lamp N1 is in an off state. At this time, the equivalent circuit diagram of the overvoltage indicating circuit is shown in fig. 3, and only the operation indicator lamp N2 is in an illuminated state.
When the alternating voltage provided by the alternating current power supply to the circuit exceeds an overvoltage threshold value, namely, the alternating current power supply generates overvoltage, at the moment, the alternating voltage of the alternating current power supply reaches or is even higher than the forward turning voltage of the bidirectional trigger diode DB, the bidirectional trigger diode DB is switched from a cut-off state to a conduction state, so that a high-level trigger signal is provided for the silicon controlled rectifier SCR, the silicon controlled rectifier SCR is switched from the cut-off state to the conduction state, and the overvoltage indicator lamp N1 is lightened and is lightened through the overvoltage indicator lamp N1 to indicate that the alternating current power supply generates overvoltage at the moment. At this time, as shown in fig. 4, the equivalent circuit diagram of the overvoltage indicating circuit shows that the overvoltage indicating lamp N1 and the operation indicating lamp N2 are both in an on state.
Therefore, the overvoltage indicating circuit does not need to use controllers such as a single chip microcomputer and the like, has a simple overall structure, and is beneficial to reducing the implementation cost and improving the overall reliability.
The invention also discloses household electricity which comprises an alternating current power supply, an electricity utilization circuit powered by the alternating current power supply and the overvoltage indicating circuit 2 connected with the electricity utilization circuit in parallel, wherein an overvoltage indicating lamp N1 in the overvoltage indicating circuit 2 indicates that the alternating current voltage provided by the alternating current power supply to the electricity utilization circuit is overvoltage through lighting.
The power utilization circuit varies depending on the load of the household electrical appliance. For example, the electric circuit of electric kettles and rice cookers is mainly a heating tube or a heating plate. For another example, the electric circuit of the induction cooker is mainly an electromagnetic coil.
It is understood that the ac power source is not necessarily directly electrically connected to the power consuming circuit, and a power switch may be provided between the ac power source and the power consuming circuit as needed. The ac power supply is not necessarily only 220V commercial power in the conventional sense, for example, the ac power supply is 220V commercial power, and outputs processed by a step-up and step-down component such as a transformer and the like according to needs and an operating voltage required by a power utilization circuit, for example, the ac power supply provides 50V or 300V ac power.
In addition, corresponding to the overvoltage indicating circuit, the invention discloses an overvoltage indicating method, which comprises the following steps: setting the forward breakover voltage of the bidirectional trigger diode DB to be matched with the overvoltage threshold of the alternating current power supply; a controllable element which is controlled by a bidirectional trigger diode DB and is connected with an overvoltage indicator lamp N1 in series; when the ac voltage supplied by the ac power source to the consumer circuit reaches or exceeds the overvoltage threshold, the diac DB conducts to conduct the controllable element to electrically illuminate the overvoltage indicator N1 to indicate that the ac voltage supplied by the ac power source to the consumer circuit is overvoltage.
Even further, the overpressure indicating method comprises: an operation indicator lamp is provided to indicate whether the ac power source has an output ac voltage. That is, in the overvoltage indication circuit, whether or not the ac power supply outputs the ac voltage is indicated by the operation indicator lamp N2, and the operation indicator lamp N2 is kept lit as long as the ac power supply outputs the ac voltage.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. An overvoltage indicating circuit is characterized by comprising a first indicating circuit and a voltage detecting circuit;
the first indicating circuit comprises an overvoltage indicating lamp which is electrically connected in series, a first end of the overvoltage indicating lamp is electrically connected with a live wire of the alternating current power supply through a second current-limiting resistor, and a second end of the overvoltage indicating lamp is electrically connected with a zero line of the alternating current power supply through a controllable element;
the voltage detection circuit comprises a bidirectional trigger diode, wherein a first end of the bidirectional trigger diode is electrically connected with a live wire of the alternating current power supply through a first current-limiting resistor, and a second end of the bidirectional trigger diode is electrically connected with a control end of the controllable element;
the forward breakover voltage of the bidirectional trigger diode is matched with the overvoltage threshold of the alternating current power supply, and only when the alternating current voltage reaches or exceeds the overvoltage threshold, the bidirectional trigger diode is conducted to trigger the controllable element to be conducted, so that the overvoltage indicator lamp is electrified and lightened to indicate that the alternating current voltage of the alternating current power supply has overvoltage.
2. The overvoltage indication circuit of claim 1, wherein the voltage indication circuit further comprises a second indication circuit, the second indication circuit comprising an operation indicator light, a first end of the operation indicator light being electrically connected to the hot line of the ac power source through a third current limiting resistor, a second end of the operation indicator light being electrically connected to the neutral line of the ac power source.
3. The overvoltage indication circuit of claim 2, wherein the overvoltage indication light and the operation indication light are neon lights.
4. The overvoltage indication circuit of claim 1, wherein the controllable element is a thyristor.
5. The overvoltage indication circuit of claim 4, wherein the thyristor is a triac.
6. The overvoltage indication circuit of claim 1, wherein the controllable element is a transistor having a gate, a source, and a drain electrically connected to the diac, the overvoltage indicator light, and the neutral line of the ac power supply, respectively.
7. An electric household appliance comprising an alternating current source, a consumer circuit powered by the alternating current source and an overvoltage indicating circuit connected in parallel with the consumer circuit, characterized in that the overvoltage indicating circuit is such as to implement the overvoltage indicating circuit according to any one of claims 1 to 6.
8. A method of indicating an overpressure, comprising:
setting the forward breakover voltage of the bidirectional trigger diode to be matched with the overvoltage threshold of the alternating-current power supply;
a controllable element connected with the overvoltage indicating lamp in a series connection mode is controlled by a bidirectional trigger diode;
only when the alternating voltage provided by the alternating current power supply to the circuit reaches or exceeds the overvoltage threshold value, the bidirectional trigger diode is conducted to trigger the controllable element to conduct, so that the overvoltage indicator lamp is powered on to indicate that the alternating voltage provided by the alternating current power supply to the circuit has overvoltage.
9. The overvoltage indication method of claim 8, further comprising: an operation indicator lamp is provided to indicate whether the ac power source has an output ac voltage.
10. The overvoltage indication method of claim 8, wherein the controllable element is a thyristor or a transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010311587.3A CN111426871A (en) | 2020-04-20 | 2020-04-20 | Overvoltage indicating circuit, overvoltage indicating method and household appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010311587.3A CN111426871A (en) | 2020-04-20 | 2020-04-20 | Overvoltage indicating circuit, overvoltage indicating method and household appliance |
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| Publication Number | Publication Date |
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| CN111426871A true CN111426871A (en) | 2020-07-17 |
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| CN202010311587.3A Pending CN111426871A (en) | 2020-04-20 | 2020-04-20 | Overvoltage indicating circuit, overvoltage indicating method and household appliance |
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2020
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Application publication date: 20200717 |