CN115598409A - Electric fire stove power detection circuit and electric fire stove - Google Patents
Electric fire stove power detection circuit and electric fire stove Download PDFInfo
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- CN115598409A CN115598409A CN202211353083.3A CN202211353083A CN115598409A CN 115598409 A CN115598409 A CN 115598409A CN 202211353083 A CN202211353083 A CN 202211353083A CN 115598409 A CN115598409 A CN 115598409A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C7/00—Stoves or ranges heated by electric energy
- F24C7/06—Arrangement or mounting of electric heating elements
- F24C7/067—Arrangement or mounting of electric heating elements on ranges
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C7/00—Stoves or ranges heated by electric energy
- F24C7/08—Arrangement or mounting of control or safety devices
- F24C7/082—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C7/00—Stoves or ranges heated by electric energy
- F24C7/08—Arrangement or mounting of control or safety devices
- F24C7/087—Arrangement or mounting of control or safety devices of electric circuits regulating heat
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/06—Frequency selective two-port networks including resistors
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
- H03M1/1245—Details of sampling arrangements or methods
Abstract
The circuit receives a mains supply voltage signal of the electric fire stove through a voltage transformer, and outputs a low-voltage sampling signal after the mains supply voltage signal is subjected to mutual inductance isolation; the current transformer receives a mains supply current signal of the electric stove, and outputs a low-current sampling signal after the mains supply current signal is subjected to mutual inductance isolation; the processing module receives and processes the low-voltage sampling signal and the low-current sampling signal to obtain power information, so that real-time power detection of the electric stove is realized, a power detection circuit is simplified, the power detection cost is reduced, power detection of the electric stove can be realized, and meanwhile, the power detection data response time is shortened.
Description
Technical Field
The application relates to the technical field of power detection, in particular to an electric fire stove power detection circuit and an electric fire stove.
Background
The electric fire stove is a novel stove which converts electric energy into heat energy through a plasma technology and generates flame through ionized air so as to realize open fire cooking. The electric stove gets rid of dependence on raw materials such as gas and the like, and uses electric energy to convert flame. The traditional combustion mode is changed. Because gas and gas are not needed, the accident of gas explosion is fundamentally solved, and compared with a gas stove, the electric stove is safer and more convenient.
The electric fire stove usually needs to carry out power detection, and through monitoring the operating power of electric fire stove to this carries out firepower control and safety protection etc. to electric fire stove. At present, the power detection mode adopted by the existing electric cooking stove is high in cost, complex in power detection structure and slow in power detection data response time.
Disclosure of Invention
Therefore, it is necessary to provide a power detection circuit of an electric cooking stove and an electric cooking stove, which can reduce the power detection cost, simplify the power detection structure and shorten the response time of the power detection data, in order to solve the problems of high cost, complex power detection structure and slow response time of the power detection data of the conventional electric cooking stove.
In order to achieve the above object, an embodiment of the present invention provides a power detection circuit for an electric fire stove, including:
the voltage transformer is configured to receive a mains supply voltage signal of the electric stove, perform mutual inductance isolation on the mains supply voltage signal and output a low-voltage sampling signal;
the current transformer is configured to receive a mains supply current signal of the electric stove, and output a low-current sampling signal after carrying out mutual inductance isolation on the mains supply current signal;
and the processing module is configured to receive the low-voltage sampling signal and the low-current sampling signal, and process the low-voltage sampling signal and the low-current sampling signal to obtain power information.
In one embodiment, the processing module comprises a processing unit, a first signal conditioning circuit and a second signal conditioning circuit; the first signal conditioning circuit is connected between the voltage transformer and the processing unit, and the second signal conditioning circuit is connected between the current transformer and the processing unit;
the first signal conditioning circuit is configured to receive the low-voltage sampling signal, perform signal conditioning on the low-voltage sampling signal, and output a sampling voltage conditioning signal; the second signal conditioning circuit is configured to receive the low-current sampling signal, perform signal conditioning on the low-current sampling signal, and output a sampling current conditioning signal; the processing unit receives the sampling voltage conditioning signal and the low current sampling signal, and processes the sampling voltage conditioning signal and the low current sampling signal to obtain power information.
In one embodiment, the first signal conditioning circuit comprises a first primary filter circuit, a first operational amplifier circuit, a first rectifying circuit and a first secondary filter circuit;
the first primary filter circuit is connected between the voltage transformer and the input end of the first operational amplifier circuit, the first rectifying circuit is connected between the output end of the first operational amplifier circuit and the input end of the first secondary filter circuit, and the output end of the first secondary filter circuit is connected with the processing unit.
In one embodiment, the first primary filter circuit comprises a first capacitor and a first resistor; the first operational amplifier circuit comprises a first operational amplifier, a second resistor, a third resistor and a fourth resistor;
the first end of the first capacitor is connected with the first output end of the voltage transformer, and the second end of the first capacitor is connected with the second output end of the voltage transformer; the first end of the first resistor is connected with the first end of the first capacitor, and the second end of the first resistor is connected with the second end of the first capacitor; the second end of the first capacitor, the second end of the first resistor and the second output end of the voltage transformer are respectively connected with the ground wire;
the first end of the second resistor is connected with the first end of the first resistor, and the second end of the second resistor is connected with the inverting input end of the first operational amplifier; the first end of the third resistor is connected with the positive input end of the first operational amplifier, and the second end of the third resistor is connected with the ground wire; the first end of the fourth resistor is connected with the inverting input end of the first operational amplifier, the second end of the fourth resistor is connected with the output end of the first operational amplifier, and the output end of the first operational amplifier is connected with the first rectifying circuit.
In one embodiment, the first rectifying circuit comprises a first rectifying diode and a fifth resistor; the first secondary filter circuit comprises a second capacitor, a third capacitor, a fourth capacitor, a sixth resistor and a seventh resistor;
the anode of the first rectifying diode is connected with the output end of the first operational amplifier, and the cathode of the first rectifying diode is connected with the first end of the sixth resistor; the first end of the fifth resistor is connected with the anode of the first rectifying diode, and the second end of the fifth resistor is connected with the ground wire;
the anode of the second capacitor is connected with the cathode of the first rectifier diode, and the cathode of the second capacitor is connected with the second end of the fifth resistor; the second end of the sixth resistor is connected with the processing unit, the first end of the seventh resistor is connected with the second end of the sixth resistor, and the second end of the seventh resistor is connected with the ground wire; the first end of the third capacitor is connected with the second end of the sixth resistor, and the second end of the third capacitor is connected with the second end of the seventh resistor; the first end of the fourth capacitor is connected with the second end of the sixth resistor, and the second end of the fourth capacitor is connected with the second end of the seventh resistor.
In one embodiment, the second signal conditioning circuit comprises a second primary filter circuit, a second operational amplifier circuit, a second rectifying circuit and a second secondary filter circuit;
the second primary filter circuit is connected between the current transformer and the input end of the second operational amplifier circuit, the second rectifying circuit is connected between the output end of the second operational amplifier circuit and the input end of the second secondary filter circuit, and the output end of the second secondary filter circuit is connected with the processing unit.
In one embodiment, the second primary filter circuit comprises a fifth capacitor and an eighth resistor; the second operational amplification circuit comprises a second operational amplifier, a ninth resistor, a tenth resistor and an eleventh resistor;
the first end of the fifth capacitor is connected with the first output end of the current transformer, and the second end of the fifth capacitor is connected with the second output end of the current transformer; the first end of the eighth resistor is connected with the first end of the fifth capacitor, and the second end of the eighth resistor is connected with the second end of the fifth capacitor; the second end of the fifth capacitor, the second end of the eighth resistor and the second output end of the current transformer are respectively connected with the ground wire;
the first end of the ninth resistor is connected with the first end of the eighth resistor, and the second end of the ninth resistor is connected with the inverting input end of the second operational amplifier; a first end of the tenth resistor is connected with the positive input end of the second operational amplifier, and a second end of the tenth resistor is connected with the ground wire; the first end of the eleventh resistor is connected with the inverting input end of the second operational amplifier, the second end of the eleventh resistor is connected with the output end of the second operational amplifier, and the output end of the second operational amplifier is connected with the second rectifying circuit.
In one embodiment, the second rectifying circuit comprises a second rectifying diode and a twelfth resistor; the second secondary filter circuit comprises a sixth capacitor, a seventh capacitor, an eighth capacitor, a thirteenth resistor and a fourteenth resistor;
the anode of the second rectifying diode is connected with the output end of the second operational amplifier, and the cathode of the second rectifying diode is connected with the first end of the thirteenth resistor; the first end of the twelfth resistor is connected with the anode of the second rectifying diode, and the second end of the twelfth resistor is connected with the ground wire;
the anode of the sixth capacitor is connected with the cathode of the second rectifier diode, and the cathode of the sixth capacitor is connected with the second end of the twelfth resistor; the second end of the thirteenth resistor is connected with the processing unit, the first end of the fourteenth resistor is connected with the second end of the thirteenth resistor, and the second end of the fourteenth resistor is connected with the ground wire; a first end of the seventh capacitor is connected with a second end of the thirteenth resistor, and a second end of the seventh capacitor is connected with a second end of the fourteenth resistor; the first end of the eighth capacitor is connected with the second end of the thirteenth resistor, and the second end of the eighth capacitor is connected with the second end of the fourteenth resistor.
In one embodiment, a first input end of the voltage transformer is connected with a live wire of a power supply line of the electric stove through a resistance component, and a second input end of the voltage transformer is connected with a zero line of the power supply line of the electric stove;
the first input end of the current transformer is connected with a zero line of a power supply circuit of the electric stove, and the second input end of the current transformer is connected with a live wire of the power supply circuit of the electric stove through a fuse;
the processing unit comprises a processing chip connected with the first signal conditioning circuit and the second signal conditioning circuit, or a multiplier connected with the first signal conditioning circuit and the second signal conditioning circuit.
On the other hand, the embodiment of the invention also provides an electric fire stove which comprises the electric fire stove power detection circuit.
One of the above technical solutions has the following advantages and beneficial effects:
in each embodiment of the power detection circuit of the electric cooking stove, a voltage transformer is used for receiving a mains supply voltage signal of the electric cooking stove, and after mutual inductance isolation is carried out on the mains supply voltage signal, a low-voltage sampling signal is output; the current transformer receives a mains supply current signal of the electric stove, and outputs a low-current sampling signal after the mains supply current signal is subjected to mutual inductance isolation; the processing module receives the low-voltage sampling signal and the low-current sampling signal, processes the low-voltage sampling signal and the low-current sampling signal to obtain power information, and achieves real-time power detection of the electric stove. This application has simplified electric fire kitchen power detection circuitry, has reduced the power detection cost, can realize electric fire kitchen power detection while, short power detection data response time.
Drawings
FIG. 1 is a first circuit diagram of a power detection circuit of an electric cooking stove in one embodiment;
FIG. 2 is a second circuit diagram of a power detection circuit of an electric cooking stove in one embodiment;
FIG. 3 is a third circuit diagram of the power detection circuit of the electric range in one embodiment
Fig. 4 is a circuit diagram of a power detection circuit of an electric fire range in one embodiment.
Reference numerals:
100. a voltage transformer; 200. a current transformer; 300. a first signal conditioning circuit; 310. a first primary filter circuit; 320. a first operational amplifier circuit; 330. a first rectifying circuit; 340. a first secondary filter circuit; 400. a second signal conditioning circuit; 410. a second primary filter circuit; 420. a second operational amplifier circuit; 430. a second rectifying circuit; 440. a second secondary filter circuit; 500. a processing module; 510. and a processing unit.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In addition, the term "plurality" shall mean two as well as more than two.
In order to solve the problems of high cost, complex power detection structure and slow response time of power detection data in the power detection mode adopted by the existing electric cooking stove, in one embodiment, as shown in fig. 1, a power detection circuit of an electric cooking stove is provided, and comprises a voltage transformer 100, a current transformer 200 and a processing module 500.
The voltage transformer 100 is configured to receive a mains voltage signal of the electric cooking stove, and output a low-voltage sampling signal after performing mutual inductance isolation on the mains voltage signal; the current transformer 200 is configured to receive a mains current signal of the electric fire range, and output a low current sampling signal after mutual inductance isolation is performed on the mains current signal; the processing module 500 is configured to receive the low-voltage sampling signal and the low-current sampling signal, and process the low-voltage sampling signal and the low-current sampling signal to obtain power information.
The voltage transformer 100 is used to convert the line voltage, so that the back-end circuit measures the line voltage. The voltage transformer 100 can isolate the front-end high-voltage part circuit from the rear-end low-voltage part circuit, so as to avoid the interference of the high-voltage signal to the low-voltage signal. The current transformer 200 is used for converting a primary current with a large value into a secondary current with a small value through a certain transformation ratio, and is used for protection, measurement and the like. The current transformer 200 can isolate the front-end high-voltage part circuit from the rear-end low-voltage part circuit, so as to avoid the interference of high-voltage signals on low-voltage signals. The processing module 500 can be used for processing the received low-voltage sampling signal and the low-current sampling signal to obtain power information, and then accurately calculating the real-time power of the electric range.
The voltage transformer 100 is connected between an input power line of the electric cooking stove and the processing module 500; based on the fact that the current transformer 200 is connected between an input power line of the electric stove and the processing module 500, the voltage transformer 100 receives a mains supply voltage signal of the electric stove, and outputs a low-voltage sampling signal to the processing module 500 after mutual inductance isolation is carried out on the mains supply voltage signal; the current transformer 200 receives a mains current signal of the electric cooking stove, and outputs a low-current sampling signal to the processing module 500 after the mains current signal is subjected to mutual inductance isolation; the processing module 500 receives the low-voltage sampling signal and the low-current sampling signal, and performs signal processing on the low-voltage sampling signal and the low-current sampling signal to obtain power information, so as to realize real-time power detection on the electric fire stove. This application has simplified electric fire kitchen power detection circuitry, has reduced the power detection cost, can shorten power detection data response time when realizing electric fire kitchen power detection.
In one embodiment, as shown in fig. 2, there is provided an electric fire power detection circuit including a voltage transformer 100, a current transformer 200, and a processing module 500. The processing module 500 includes a first signal conditioning circuit 300, a second signal conditioning circuit 400, and a processing unit 510.
The first signal conditioning circuit 300 is connected between the voltage transformer 100 and the processing unit 510, and the second signal conditioning circuit 400 is connected between the current transformer 200 and the processing unit 510; the first signal conditioning circuit 300 is configured to receive the low-voltage sampling signal, perform signal conditioning on the low-voltage sampling signal, and output a sampled voltage conditioning signal; the second signal conditioning circuit 400 is configured to receive the low-current sampling signal, perform signal conditioning on the low-current sampling signal, and output a sampled-current conditioning signal; the processing unit 510 receives the sampled voltage conditioning signal and the low current sampling signal, and processes the sampled voltage conditioning signal and the low current sampling signal to obtain power information.
The first signal conditioning circuit 300 may be configured to perform signal conditioning such as rectification and filtering on the low-voltage sampling signal, reduce noise of the low-voltage sampling signal, and enable the output sampling voltage conditioning signal to meet the signal amplitude requirement of the processing unit 510. The second signal conditioning circuit 400 may be configured to perform signal conditioning such as rectification and filtering on the low-current sampling signal, so as to reduce noise of the low-current sampling signal, and enable the output sampling current conditioning signal to meet the signal amplitude requirement of the processing unit 510. The processing unit 510 may be configured to process the received sampled voltage conditioning signal and sampled current conditioning signal to obtain power information, and then accurately calculate the real-time power of the electric range.
The voltage transformer 100 is connected between an input power line of the electric cooking stove and the first signal conditioning circuit 300, and the first signal conditioning circuit 300 is connected with the processing unit 510; based on the fact that the current transformer 200 is connected between an input power line of the electric stove and the second signal conditioning circuit 400, the second signal conditioning circuit 400 is connected with the processing unit 510, and then the voltage transformer 100 receives a high-voltage signal of the electric stove, performs mutual inductance isolation on the high-voltage signal, and outputs a low-voltage sampling signal to the first signal conditioning circuit 300; the current transformer 200 receives a high current signal of the electric stove, and outputs a low current sampling signal to the second signal conditioning circuit 400 after performing mutual inductance isolation on the high current signal; the first signal conditioning circuit 300 receives the low voltage sampling signal, performs signal conditioning on the low voltage sampling signal, and outputs a sampling voltage conditioning signal to the processing unit 510; the second signal conditioning circuit 400 receives the low-current sampling signal, conditions the low-current sampling signal, and outputs a sampled current conditioning signal to the processing unit 510; the processing unit 510 receives the sampled voltage conditioning signal and the sampled current conditioning signal, processes the sampled voltage conditioning signal and the sampled current conditioning signal, obtains power information, and realizes real-time power detection of the electric fire stove. This application has simplified electric fire kitchen power detection circuitry, has reduced the power detection cost, can shorten power detection data response time when realizing electric fire kitchen power detection.
In one embodiment, as shown in fig. 3, the first signal conditioning circuit 300 includes a first primary filtering circuit 310, a first operational amplifying circuit 320, a first rectifying circuit 330, and a first secondary filtering circuit 340.
The first primary filter circuit 310 is connected between the voltage transformer 100 and the input terminal of the first operational amplifier circuit 320, the first rectifying circuit 330 is connected between the output terminal of the first operational amplifier circuit 320 and the input terminal of the first secondary filter circuit 340, and the output terminal of the first secondary filter circuit 340 is connected to the processing unit 510.
The first primary filter circuit 310 may be configured to filter the low-voltage sampling signal at the output end of the voltage transformer 100, so as to filter noise of the low-voltage signal. The first operational amplifier circuit 320 may be used to perform voltage conversion on the low-voltage sampling signal; the first rectifying circuit 330 may be used to rectify the voltage-converted low-voltage sampling signal. The first secondary filter circuit 340 may be configured to further filter the rectified signal, and further output a sampled voltage conditioning signal meeting the sampling requirement of the processing unit 510.
Based on that the first primary filter circuit 310 is connected between the input ends of the voltage transformer 100 and the first operational amplifier circuit 320, the first rectifying circuit 330 is connected between the output end of the first operational amplifier circuit 320 and the input end of the first secondary filter circuit 340, the output end of the first secondary filter circuit 340 is connected with the processing unit 510, the voltage transformer 100 receives a high voltage signal of the electric stove, and outputs a low voltage sampling signal to the first primary filter circuit 310 after carrying out mutual inductance isolation on the high voltage signal; after the first primary filter circuit 310 performs primary filtering processing on the low-voltage sampling signal, voltage conversion, rectification and secondary filtering processing are performed through the first operational amplifier circuit 320, the first rectifier circuit 330 and the first secondary filter circuit 340 in sequence, and then a sampling voltage conditioning signal is output to the processing unit 510, so that the acquisition of the voltage signal of the electric fire stove is realized.
In a specific embodiment, as shown in fig. 3 and 4, the first primary filter circuit 310 includes a first capacitor C1 and a first resistor R1; the first operational amplifier circuit 320 includes a first operational amplifier U1, a second resistor R2, a third resistor R3, and a fourth resistor R4.
A first end of the first capacitor C1 is connected to a first output end of the voltage transformer 100, and a second end of the first capacitor C1 is connected to a second output end of the voltage transformer 100; a first end of the first resistor R1 is connected with a first end of the first capacitor C1, and a second end of the first resistor R1 is connected with a second end of the first capacitor C1; the second end of the first capacitor C1, the second end of the first resistor R1 and the second output end of the voltage transformer 100 are respectively connected to the ground. A first end of the second resistor R2 is connected with a first end of the first resistor R1, and a second end of the second resistor R2 is connected with an inverting input end of the first operational amplifier U1; a first end of the third resistor R3 is connected with the positive input end of the first operational amplifier U1, and a second end of the third resistor R3 is connected with the ground wire; a first end of the fourth resistor R4 is connected to the inverting input terminal of the first operational amplifier U1, a second end of the fourth resistor R4 is connected to the output terminal of the first operational amplifier U1, and the output terminal of the first operational amplifier U1 is connected to the first rectifying circuit 330.
It should be noted that the first operational amplifier U1 may be an operational amplifier of the LM258 type.
In a specific embodiment, as shown in fig. 2 and 3, the first rectifying circuit 330 includes a first rectifying diode D1 and a fifth resistor R5; the first secondary filter circuit 340 includes a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a sixth resistor R6, and a seventh resistor R7.
The anode of the first rectifying diode D1 is connected with the output end of the first operational amplifier U1, and the cathode of the first rectifying diode D1 is connected with the first end of the sixth resistor R6; a first end of the fifth resistor R5 is connected to the anode of the first rectifying diode D1, and a second end of the fifth resistor R5 is connected to the ground. The anode of the second capacitor C2 is connected to the cathode of the first rectifying diode D1, and the cathode of the second capacitor C2 is connected to the second end of the fifth resistor R5; a second end of the sixth resistor R6 is connected to the processing unit 510, a first end of the seventh resistor R7 is connected to a second end of the sixth resistor R6, and a second end of the seventh resistor R7 is connected to the ground; a first end of the third capacitor C3 is connected to a second end of the sixth resistor R6, and a second end of the third capacitor C3 is connected to a second end of the seventh resistor R7; a first end of the fourth capacitor C4 is connected to a second end of the sixth resistor R6, and a second end of the fourth capacitor C4 is connected to a second end of the seventh resistor R7.
In the above embodiment, the low-voltage sampling signal is conditioned by sequentially passing through the first primary filter circuit 310, the first operational amplifier U1, the first rectifying circuit 330, and the first secondary filter circuit 340, and a sampling voltage conditioning signal meeting the sampling requirement of the processing unit 510 is output. Through the simplification to electric fire kitchen power detection circuitry, reduced the power detection cost, can shorten power detection data response time when realizing electric fire kitchen power detection.
In one embodiment, as shown in fig. 3, the second signal conditioning circuit 400 includes a second primary filtering circuit 410, a second operational amplifying circuit 420, a second rectifying circuit 430 and a second secondary filtering circuit 440. The second primary filter circuit 410 is connected between the current transformer 200 and the input terminal of the second operational amplifier circuit 420, the second rectifying circuit 430 is connected between the output terminal of the second operational amplifier circuit 420 and the input terminal of the second secondary filter circuit 440, and the output terminal of the second secondary filter circuit 440 is connected to the processing unit 510.
The second primary filter circuit 410 may be configured to filter the low-current sampling signal at the output end of the current transformer 200, so as to filter noise of the low-current signal. The second operational amplifier circuit 420 may be used to perform voltage conversion on the low current sampling signal; the second rectifying circuit 430 may be used to rectify the voltage-converted low-current sampling signal. The second secondary filter circuit 440 may be configured to further filter the rectified signal, and further output a sampled current conditioning signal meeting the sampling requirement of the processing unit 510.
Based on that the second primary filter circuit 410 is connected between the current transformer 200 and the input end of the second operational amplifier circuit 420, the second rectification circuit 430 is connected between the output end of the second operational amplifier circuit 420 and the input end of the second secondary filter circuit 440, the output end of the second secondary filter circuit 440 is connected with the processing unit 510, the current transformer 200 receives a high current signal of the electric stove, and outputs a low current sampling signal to the second primary filter circuit 410 after carrying out mutual inductance isolation on the high current signal; after the second primary filter circuit 410 performs primary filtering processing on the low current sampling signal, voltage conversion, rectification and secondary filtering processing are performed through the second operational amplifier circuit 420, the second rectifier circuit 430 and the second secondary filter circuit 440 in sequence, and then a sampling current conditioning signal is output to the processing unit 510, so that the acquisition of the current signal of the electric fire stove is realized.
In a specific embodiment, as in fig. 3 and 4, the second primary filter circuit 410 includes a fifth capacitor C5 and an eighth resistor R8; the second operational amplifier circuit 420 includes a second operational amplifier U2, a ninth resistor R9, a tenth resistor R10, and an eleventh resistor R11.
A first end of the fifth capacitor C5 is connected to the first output end of the current transformer 200, and a second end of the fifth capacitor C5 is connected to the second output end of the current transformer 200; a first end of the eighth resistor R8 is connected to a first end of the fifth capacitor C5, and a second end of the eighth resistor R8 is connected to a second end of the fifth capacitor C5; the second end of the fifth capacitor C5, the second end of the eighth resistor R8 and the second output end of the current transformer 200 are connected to the ground line, respectively.
A first end of the ninth resistor R9 is connected with a first end of the eighth resistor R8, and a second end of the ninth resistor R9 is connected with an inverting input end of the second operational amplifier U2; a first end of the tenth resistor R10 is connected with the positive input end of the second operational amplifier U2, and a second end of the tenth resistor R10 is connected with the ground wire; a first end of the eleventh resistor R11 is connected to the inverting input terminal of the second operational amplifier U2, a second end of the eleventh resistor R11 is connected to the output terminal of the second operational amplifier U2, and the output terminal of the second operational amplifier U2 is connected to the second rectifying circuit 430.
In a specific embodiment, as in fig. 2 and 3, the second rectifying circuit 430 includes a second rectifying diode D2 and a twelfth resistor R12; the second secondary filter circuit 440 includes a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a thirteenth resistor R13, and a fourteenth resistor R14.
The anode of the second rectifying diode D2 is connected to the output end of the second operational amplifier U2, and the cathode of the second rectifying diode D2 is connected to the first end of the thirteenth resistor R13; a first end of the twelfth resistor R12 is connected to the anode of the second rectifying diode D2, and a second end of the twelfth resistor R12 is connected to the ground. The anode of the sixth capacitor C6 is connected to the cathode of the second rectifier diode D2, and the cathode of the sixth capacitor C6 is connected to the second end of the twelfth resistor R12; a second end of the thirteenth resistor R13 is connected to the processing unit 510, a first end of the fourteenth resistor R14 is connected to a second end of the thirteenth resistor R13, and a second end of the fourteenth resistor R14 is connected to the ground; a first end of the seventh capacitor C7 is connected to a second end of the thirteenth resistor R13, and a second end of the seventh capacitor C7 is connected to a second end of the fourteenth resistor R14; a first end of the eighth capacitor C8 is connected to the second end of the thirteenth resistor R13, and a second end of the eighth capacitor C8 is connected to the second end of the fourteenth resistor R14.
In the above embodiment, the low-current sampling signal is conditioned by sequentially passing through the second primary filter circuit 410, the second operational amplifier U2, the second rectification circuit 430 and the second secondary filter circuit 440, and a sampling current conditioning signal meeting the sampling requirement of the processing unit 510 is output. Through the simplification to electric fire kitchen power detection circuitry, reduced the power detection cost, can shorten power detection data response time when realizing electric fire kitchen power detection.
In one embodiment, a first input end of the voltage transformer is connected with a live wire of a power supply line of the electric range through a resistance component, and a second input end of the voltage transformer is connected with a neutral wire of the power supply line of the electric range. The first input end of the current transformer is connected with a power supply line zero line of the electric stove, and the second input end of the current transformer is connected with a power supply line live line of the electric stove through a fuse.
Wherein, the power supply line of the electric fire stove can provide 220V alternating current. Through set up resistance module between voltage transformer's first input and the power supply line live wire of electric fire kitchen, exemplarily, resistance module can include the resistance of 2 series connections, and the resistance of resistance can be set for according to actual circuit design demand. The fuse is arranged between the second input end of the current transformer and a power line live wire of a power supply circuit of the electric cooking stove, and the starting point of the fuse plays a role in circuit protection.
In one embodiment, the processing module includes a processing chip connecting the first signal conditioning circuit and the second signal conditioning circuit, or a multiplier connecting the first signal conditioning circuit and the second signal conditioning circuit.
For example, the processing chip can be a single chip Microcomputer (MCU), receives the sampling voltage conditioning signal and the sampling current conditioning signal, processes the sampling voltage conditioning signal and the sampling current conditioning signal to obtain power information, and can shorten the response time of power detection data while realizing the power detection of the electric stove.
For another example, the first input end of the multiplier is connected with the first signal conditioning circuit, the second input end of the multiplier is connected with the second signal conditioning circuit, the multiplier receives the sampling voltage conditioning signal transmitted by the first signal conditioning circuit and the sampling current conditioning signal transmitted by the second signal conditioning circuit, and processes the sampling voltage conditioning signal and the sampling current conditioning signal to obtain power information, so that the power detection of the electric stove can be realized, and meanwhile, the response time of power detection data is shortened.
In one embodiment, there is also provided an electric fire comprising any one of the above electric fire power detection circuits.
For specific contents of the electric fire stove power detection circuit, reference may be made to the description of the electric fire stove power detection circuit in the above embodiments, and details are not repeated here.
Receiving a high-voltage signal of the electric fire stove through a voltage transformer, carrying out mutual inductance isolation on the high-voltage signal, and outputting a low-voltage sampling signal; the current transformer receives a high current signal of the electric stove, and outputs a low current sampling signal after carrying out mutual inductance isolation on the high current signal; the first signal conditioning circuit receives the low-voltage sampling signal, conditions the low-voltage sampling signal and outputs a sampling voltage conditioning signal; the second signal conditioning circuit receives the low-current sampling signal, conditions the low-current sampling signal and outputs a sampling current conditioning signal; the processing module receives the sampling voltage conditioning signal and the sampling current conditioning signal, processes the sampling voltage conditioning signal and the sampling current conditioning signal to obtain power information, and realizes real-time power detection of the electric fire stove. This application has simplified electric fire kitchen power detection circuitry, has reduced the power detection cost, can shorten power detection data response time when realizing electric fire kitchen power detection.
An electric fire comprising: a housing assembly; the furnace end assembly comprises a furnace end shell and a plasma assembly, the furnace end shell is arranged on the shell assembly, and the plasma assembly is arranged on the furnace end shell; the transformer assembly is arranged on the shell assembly and/or the furnace end assembly and is electrically connected with the plasma assembly, and the transformer assembly is used for supplying power to the plasma assembly; and the control assembly is electrically connected with the transformer assembly.
The utility model discloses an electric fire kitchen, supply high-voltage electricity to the furnace end subassembly through control assembly cooperation transformer subassembly, carry out the during operation at control assembly control transformer subassembly, plasma subassembly is towards the pot body effect of outside or is acted on between the plasma subassembly and punctures the air and produce plasma, thereby the heat that produces through the plasma that produces realizes realizing stable heating to the heating of the outside pot body. Heating through this kind of mode has comparatively stable heat supply, can avoid the use to the gas simultaneously. In the use, can last to the pot body heating, the process of heating is similar open flame heating, and the use can be accepted by the user more, and heating effect is close can comparatively stable carry out the heating that lasts to the pot body with open flame heating moreover.
Optionally, the electric fire power detection circuit forms part of the control assembly.
The transformer assembly comprises a transformer shell, a limiting support, a magnetic core assembly, a first coil assembly and a second coil assembly, the transformer shell is provided with a third installation cavity, the magnetic core assembly is located in the third installation cavity of the transformer shell, the magnetic core assembly is abutted to the transformer shell, the limiting support is arranged in the transformer shell and arranged on the magnetic core assembly, the limiting support is used for limiting the magnetic core assembly, the first coil assembly and the second coil assembly are sleeved on the magnetic core assembly, and the first coil assembly and the second coil assembly are matched with each other.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An electric fire range power detection circuit, comprising:
the voltage transformer is configured to receive a mains supply voltage signal of the electric stove, perform mutual inductance isolation on the mains supply voltage signal and output a low-voltage sampling signal;
the current transformer is configured to receive a mains current signal of the electric stove, perform mutual inductance isolation on the mains current signal and output a low-current sampling signal;
a processing module configured to receive the low-voltage sampled signal and the low-current sampled signal and process the low-voltage sampled signal and the low-current sampled signal to obtain power information.
2. The electric fire range power detection circuit of claim 1, wherein the processing module comprises a processing unit, a first signal conditioning circuit, and a second signal conditioning circuit; the first signal conditioning circuit is connected between the voltage transformer and the processing unit, and the second signal conditioning circuit is connected between the current transformer and the processing unit;
the first signal conditioning circuit is configured to receive the low-voltage sampling signal, perform signal conditioning on the low-voltage sampling signal, and output a sampling voltage conditioning signal; the second signal conditioning circuit is configured to receive the low-current sampling signal, perform signal conditioning on the low-current sampling signal, and output a sampled current conditioning signal; and the processing unit receives the sampling voltage conditioning signal and the low current sampling signal, and processes the sampling voltage conditioning signal and the low current sampling signal to obtain the power information.
3. The electric fire range power detection circuit of claim 2, wherein the first signal conditioning circuit comprises a first primary filter circuit, a first operational amplifier circuit, a first rectifier circuit, and a first secondary filter circuit;
the first primary filter circuit is connected between the voltage transformer and the input end of the first operational amplifier circuit, the first rectifying circuit is connected between the output end of the first operational amplifier circuit and the input end of the first secondary filter circuit, and the output end of the first secondary filter circuit is connected with the processing unit.
4. The electric fire power detection circuit of claim 3 wherein the first primary filter circuit comprises a first capacitor and a first resistor; the first operational amplifier circuit comprises a first operational amplifier, a second resistor, a third resistor and a fourth resistor;
the first end of the first capacitor is connected with the first output end of the voltage transformer, and the second end of the first capacitor is connected with the second output end of the voltage transformer; the first end of the first resistor is connected with the first end of the first capacitor, and the second end of the first resistor is connected with the second end of the first capacitor; the second end of the first capacitor, the second end of the first resistor and the second output end of the voltage transformer are respectively connected with a ground wire;
the first end of the second resistor is connected with the first end of the first resistor, and the second end of the second resistor is connected with the inverting input end of the first operational amplifier; the first end of the third resistor is connected with the positive input end of the first operational amplifier, and the second end of the third resistor is connected with the ground wire; the first end of the fourth resistor is connected with the inverting input end of the first operational amplifier, the second end of the fourth resistor is connected with the output end of the first operational amplifier, and the output end of the first operational amplifier is connected with the first rectifying circuit.
5. The electric fire range power detection circuit of claim 3, wherein the first rectification circuit comprises a first rectification diode and a fifth resistor; the first secondary filter circuit comprises a second capacitor, a third capacitor, a fourth capacitor, a sixth resistor and a seventh resistor;
the anode of the first rectifying diode is connected with the output end of the first operational amplifier, and the cathode of the first rectifying diode is connected with the first end of the sixth resistor; the first end of the fifth resistor is connected with the anode of the first rectifying diode, and the second end of the fifth resistor is connected with the ground wire;
the anode of the second capacitor is connected with the cathode of the first rectifier diode, and the cathode of the second capacitor is connected with the second end of the fifth resistor; the second end of the sixth resistor is connected with the processing unit, the first end of the seventh resistor is connected with the second end of the sixth resistor, and the second end of the seventh resistor is connected with the ground wire; a first end of the third capacitor is connected with a second end of the sixth resistor, and a second end of the third capacitor is connected with a second end of the seventh resistor; and the first end of the fourth capacitor is connected with the second end of the sixth resistor, and the second end of the fourth capacitor is connected with the second end of the seventh resistor.
6. The electric fire range power detection circuit of claim 2, wherein the second signal conditioning circuit comprises a second primary filter circuit, a second operational amplifier circuit, a second rectifier circuit, and a second secondary filter circuit;
the second primary filter circuit is connected between the current transformer and the input end of the second operational amplifier circuit, the second rectifier circuit is connected between the output end of the second operational amplifier circuit and the input end of the second secondary filter circuit, and the output end of the second secondary filter circuit is connected with the processing unit.
7. The electric fire range power detection circuit of claim 6, wherein the second primary filter circuit comprises a fifth capacitance and an eighth resistance; the second operational amplifier circuit comprises a second operational amplifier, a ninth resistor, a tenth resistor and an eleventh resistor;
a first end of the fifth capacitor is connected with the first output end of the current transformer, and a second end of the fifth capacitor is connected with the second output end of the current transformer; a first end of the eighth resistor is connected with a first end of the fifth capacitor, and a second end of the eighth resistor is connected with a second end of the fifth capacitor; the second end of the fifth capacitor, the second end of the eighth resistor and the second output end of the current transformer are respectively connected with a ground wire;
a first end of the ninth resistor is connected with a first end of the eighth resistor, and a second end of the ninth resistor is connected with an inverting input end of the second operational amplifier; a first end of the tenth resistor is connected with a positive input end of the second operational amplifier, and a second end of the tenth resistor is connected with a ground wire; the first end of the eleventh resistor is connected with the inverting input end of the second operational amplifier, the second end of the eleventh resistor is connected with the output end of the second operational amplifier, and the output end of the second operational amplifier is connected with the second rectifying circuit.
8. The electric fire range power detection circuit of claim 6, wherein the second rectification circuit comprises a second rectification diode and a twelfth resistor; the second secondary filter circuit comprises a sixth capacitor, a seventh capacitor, an eighth capacitor, a thirteenth resistor and a fourteenth resistor;
the anode of the second rectifying diode is connected with the output end of the second operational amplifier, and the cathode of the second rectifying diode is connected with the first end of the thirteenth resistor; a first end of the twelfth resistor is connected with the anode of the second rectifying diode, and a second end of the twelfth resistor is connected with the ground wire;
the anode of the sixth capacitor is connected with the cathode of the second rectifier diode, and the cathode of the sixth capacitor is connected with the second end of the twelfth resistor; a second end of the thirteenth resistor is connected with the processing unit, a first end of the fourteenth resistor is connected with a second end of the thirteenth resistor, and a second end of the fourteenth resistor is connected with a ground wire; a first end of the seventh capacitor is connected to the second end of the thirteenth resistor, and a second end of the seventh capacitor is connected to the second end of the fourteenth resistor; a first end of the eighth capacitor is connected to the second end of the thirteenth resistor, and a second end of the eighth capacitor is connected to the second end of the fourteenth resistor.
9. The electric fire stove power detection circuit according to claim 2, wherein a first input end of the voltage transformer is connected with a live line of a power supply line of the electric fire stove through a resistance component, and a second input end of the voltage transformer is connected with a zero line of the power supply line of the electric fire stove;
the first input end of the current transformer is connected with a zero line of a power supply circuit of the electric stove, and the second input end of the current transformer is connected with a live line of the power supply circuit of the electric stove through a fuse;
the processing unit comprises a processing chip connected with the first signal conditioning circuit and the second signal conditioning circuit, or a multiplier connected with the first signal conditioning circuit and the second signal conditioning circuit.
10. An electric fire comprising the electric fire power detection circuit of any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211353083.3A CN115598409A (en) | 2022-11-01 | 2022-11-01 | Electric fire stove power detection circuit and electric fire stove |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211353083.3A CN115598409A (en) | 2022-11-01 | 2022-11-01 | Electric fire stove power detection circuit and electric fire stove |
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| CN115598409A true CN115598409A (en) | 2023-01-13 |
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| CN202211353083.3A Pending CN115598409A (en) | 2022-11-01 | 2022-11-01 | Electric fire stove power detection circuit and electric fire stove |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117665382A (en) * | 2024-01-31 | 2024-03-08 | 季华实验室 | Power detection circuit and power detection PCB |
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Effective date of registration: 20230703 Address after: 419, No. 9, Fuhai Industrial Zone, Fuyong Community, Fuyong Subdistrict, Bao'an District, Shenzhen, Guangdong 518100 Applicant after: Shenzhen guoai Quandian Intelligent Technology Co.,Ltd. Applicant after: Guoai Intelligent Electrical Appliances (Zhongshan) Co.,Ltd. Address before: 518103 Room 302, Building A7, Fuhai Information Port, Xinhe Community, Fuhai Street, Baoan District, Shenzhen, Guangdong, China Applicant before: Shenzhen guoai Quandian Intelligent Technology Co.,Ltd. |