CN1979006A - Microwave-oven power-supply voltage monitoring circuit and method for protecting abnormal power-supply voltage - Google Patents
Microwave-oven power-supply voltage monitoring circuit and method for protecting abnormal power-supply voltage Download PDFInfo
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- CN1979006A CN1979006A CN 200510125953 CN200510125953A CN1979006A CN 1979006 A CN1979006 A CN 1979006A CN 200510125953 CN200510125953 CN 200510125953 CN 200510125953 A CN200510125953 A CN 200510125953A CN 1979006 A CN1979006 A CN 1979006A
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Abstract
The invention discloses a microwave furnace power supply voltage monitoring circuit that includes sampling circuit, microwave furnace central control unit to judge if the voltage is in normal working range, microwave furnace working control unit to realize control the working mode of microwave furnace according to the instruction of microwave furnace central control unit. The invention could monitor power supply voltage of microwave furnace and could stop working when voltage fluctuation exceeding normal range. The invention also discloses a protecting method for microwave furnace power supply voltage abnormal.
Description
Technical field
The present invention relates to electric voltage observation circuit, relate in particular to the unusual guard method of micro-wave oven electric voltage observation circuit and supply voltage.
Background technology
It is 5% that the theoretical voltage of present Chinese electrical network is floated, but the situation of electrical network is very complicated, and therefore in different regions, time domain, bigger floating may appear in voltage, makes electrical equipment be in the duty of super-pressure or ultralow pressure, has a strong impact on Electrical Safety.For example, because spread of voltage might cause electric apparatus temperature rise too high, the fire that might cause when serious; Reduce harm such as electrical equipment service life because of spread of voltage then more extensive.
Specific to micro-wave oven, its magnetron etc. is used to realize that the parts of heating using microwave are more responsive to voltage, works under the voltage of specified requirement not meeting, and its life-span reduces.If overtension also may cause the heating clamber temperature too high, influence adds thermal effect.Therefore, guarantee that micro-wave oven works in suitable voltage range particular importance.Under the prior art, to the working power voltage of micro-wave oven without any monitoring, become a big hidden danger of micro-wave oven work.
Summary of the invention
At above-mentioned defective, the technical problem that the present invention solves is, a kind of observation circuit of microwave oven supply power voltage is provided, and when making overtension or mistake low, can in time stop the work of micro-wave oven.The present invention provides a kind of guard method of microwave oven supply power electric voltage exception simultaneously.
Electric voltage observation circuit provided by the invention comprises:
Sample circuit is used for the microwave oven supply power voltage sample; It is input as microwave oven supply power voltage, is output as the sampled signal of supply voltage;
The micro-wave oven central control unit is used for calculating supply voltage value according to described sampled signal, and this voltage is compared with the micro-wave oven operating voltage range, if supply voltage is in the normal range (NR) of operating voltage, then controls the micro-wave oven operate as normal; If supply voltage exceeds the normal range (NR) of supply voltage, then output stops the instruction of micro-wave oven work or the instruction of output locking micro-wave oven work;
The micro-wave oven control of working unit is used to receive the instruction of micro-wave oven central control unit, according to the control of this instruction realization to micro-wave oven work; If the instruction of micro-wave oven central control unit output stopping micro-wave oven work, then its control micro-wave oven device work quits work.
Preferably, this micro-wave oven electric voltage observation circuit also comprises display unit, is used to receive the display driver information of described micro-wave oven central control unit, the relevant information of display power supply voltage; When described micro-wave oven central control unit judges that supply voltage is in normal range (NR), then the normal display driver information of output supply voltage is to described display unit, exceed normal range (NR) if judge supply voltage, then the unusual display driver information of output supply voltage is to described display unit.
Preferably, described micro-wave oven central control unit is according to the display driver information of calculating the supply voltage output supply voltage value that obtains; Described display unit receives the display driver information of described supply voltage value, the magnitude of voltage of display power supply voltage in view of the above.
Preferably, described sample circuit comprises transforming circuit, rectification circuit, bleeder circuit;
Described transforming circuit is used for supply voltage is changed into the voltage and the output of the voltage range that is suitable for detecting;
Described rectification circuit, the voltage commutation that is used for described transforming circuit output is DC voltage output;
Described bleeder circuit is used for the sampled signal as supply voltage after the DC voltage dividing potential drop of described rectification circuit output is exported.
Preferably, described transforming circuit is a low-tension transformer, and its primary coil connects microwave oven supply power voltage, and secondary coil output is through the voltage after the transformation.
Preferably, described rectification circuit comprises: bridge rectifier and diode; The input of described bridge rectifier receives the output voltage of described transforming circuit, and output head anode connects the anode of described diode, and negative pole connects power supply ground; This rectification circuit is output as the negative electrode of described diode and the DC voltage between the power supply ground.
Preferably, described bleeder circuit comprises first resistance and second resistance; Wherein first resistance, one end connects the positive pole of rectifier power source output voltage, and the other end is connected to power supply ground by second resistance; Described sampled signal is the voltage between first resistance and the second resistance common port and the power supply ground.
This guard method that a kind of microwave oven supply power electric voltage exception is provided simultaneously is characterized in that, comprising:
81) current supply voltage is sampled;
82) acquisition supply voltage sampled value and the normal voltage scope of having set are compared, judge whether in the normal voltage scope; If then enter step 83); If not, then enter step 84)
83) make the micro-wave oven operate as normal; And return 81)
84) output supply voltage abnormal signal quits work micro-wave oven or locks the work of micro-wave oven; And return 81).
Preferably, described step 83) also comprise the normal information of display unit display power supply voltage; Described step 84) also comprises the warning message of display unit display power supply electric voltage exception.
Microwave oven supply power electric voltage observation circuit provided by the invention and the unusual guard method of supply voltage; supply voltage that can the timely monitor micro-wave oven; and when supply voltage exceeds the normal voltage fluctuation range; stop the work of micro-wave oven; make the micro-wave oven device work can be and suffer damage, also can avoid the heating clamber temperature too high because of being operated under the too high or too low voltage.
Description of drawings
Fig. 1 is the circuit diagram of first embodiment of the invention;
Fig. 2 is the flow chart of first embodiment of the invention.
The specific embodiment
Please, be the circuit diagram of first embodiment of the invention referring to Fig. 1.
Microwave oven supply power electric voltage observation circuit provided by the invention comprises sample circuit, micro-wave oven central control unit, display unit, micro-wave oven control of working unit.
Described sample circuit is used to realize the sampling to supply voltage.It receives the supply voltage of micro-wave oven, the output sampled voltage, and this sampled voltage is directly proportional with the supply voltage of micro-wave oven.
Described sample circuit comprises: transforming circuit, rectification circuit, bleeder circuit.
Described transforming circuit is used for changing supply voltage into be suitable for detecting voltage range.Because line voltage is higher, generally can't directly detect it, therefore at first should line voltage be changed in the voltage range of suitable detection by transformer, could be to its further processing.
Fig. 1 illustrates described transforming circuit and comprises a low-tension transformer B, and its parallel connection of primary windings is on the AC power for the micro-wave oven power supply, and secondary coil provides a suitable alternating voltage output.The output voltage of the secondary coil of this low-tension transformer B is far below the input voltage of primary coil.For example, the input voltage of primary coil is civil power 220V, and the output voltage of secondary coil is 24V.
Described rectification circuit is used for the output voltage with described transforming circuit, and changes it into DC voltage output.This is because the A/D input terminal of micro-wave oven central control unit can only be accepted the DC voltage input, therefore must change alternating voltage into DC voltage earlier.
Fig. 1 illustrates described rectification circuit and comprises a bridge rectifier QZ, a diode D.The input of this rectification circuit is exactly the input of described bridge rectifier, it receives the output of described transformer B, the negative pole of output end of bridge rectifier QZ connects power supply ground, and output head anode connects the anode of described diode D, and the negative electrode of described diode D is the output of rectification circuit.
Described bridge rectifier QZ can be direct current output with the AC rectification of input.The effect of described diode D is when bridge rectifier breaks down, and avoids alternating current directly to enter the micro-wave oven central control unit.
Described bleeder circuit receives the DC voltage of described rectification circuit output, to exporting after this DC voltage dividing potential drop.The voltage that the effect of this circuit is to provide suitable is to the micro-wave oven central control unit.
Fig. 1 illustrates resistance R 1, the resistance R 2 that described bleeder circuit comprises mutual series connection.Resistance R 1 one ends connect the negative electrode of described rectification circuit diode D, and the other end connects power supply ground by resistance R 2.Therefore, the resistance R 1 of series connection, resistance R 2 two ends receive the DC voltage of described rectification circuit output.The output voltage of this bleeder circuit is the voltage between resistance R 2 and the power supply ground.This output voltage is the dividing potential drop of Output Voltage in Rectified Circuits, and this output voltage should meet the required voltage range of A/D input terminal of micro-wave oven central control unit.This voltage range can be selected with the ratio of the resistance value of resistance R 2 by changing resistance R 1.
Described micro-wave oven central control unit is the kernel control chip of micro-wave oven, and it receives command signal, detection signal, realizes logic control to micro-wave oven work according to above-mentioned input signal and default program, finally exports control command.This micro-wave oven central control unit generally can be the microprocessor of single-chip microcomputer or other type.In this circuit, its A/D conversion port receives the voltage of described bleeder circuit output, and this voltage input is converted to digital value by computing, the current voltage of this digital value reflection electrical network.This digital value that this central control unit will obtain and predefined range of voltage values relatively judge whether voltage is normal.If normal, then control the micro-wave oven operate as normal; If current voltage exceeds normal range (NR), and micro-wave oven works, and then exports the work that halt instruction stops micro-wave oven; If micro-wave oven is not worked as yet, then export lock instruction, micro-wave oven can't be worked.
Described micro-wave oven control of working unit, the electrical equipment control to micro-wave oven is carried out in the instruction that is used for exporting according to micro-wave oven, realizes the heavy-current control to micro-wave oven.Described output order is subjected to the influence of aforesaid voltage judged result, when detection shows that current voltage exceeds normal range (NR), this output order is for stopping running of microwave oven, and it is out of service that then the micro-wave oven control of working unit will be controlled the operation parts such as magnetron, high-tension transformer of micro-wave oven.
Described display unit is used to receive the output of micro-wave oven central control unit, shows the situation of current supply voltage.Particularly, can be the magnitude of voltage that shows work at present voltage, so that the user judges voluntarily; Also can be when electric voltage exception, display alarm information.
Please, carry out the flow chart of voltage monitoring and supply voltage abnormal protection for micro-wave oven electric voltage observation circuit of the present invention referring to Fig. 2.
Step S21 carries out the supply voltage sampling.
Described supply voltage collection specifically is that the micro-wave oven central control unit is gathered supply voltage value from its A/D input terminal.This supply voltage needs to look the supply voltage situation through transformation rectification and dividing potential drop before being sampled and entering the A/D input terminal, obtains to meet the DC voltage that the input of A/D terminal requires.Detailed process as previously mentioned.The voltage that sampling obtains is directly proportional with supply voltage value.
Step S22 judges that supply voltage is whether in normal domain of walker, if then enter step S23; If not, then enter step S24.
Judge that supply voltage is whether in claimed range.The size of described sampled voltage has reflected the size of supply voltage, and its sampling enters after the micro-wave oven central control unit, is converted into digital quantity through A/D.This digital quantity is compared with the digital quantity of normal floating voltage scope in being set in the micro-wave oven central control unit, if it is in the floating voltage scope, then normal; Otherwise, then undesired.
Step S23, prompting voltage is normal, and makes the micro-wave oven operate as normal.
The micro-wave oven central control unit drives display unit and shows that voltage is normal, also can while display power supply magnitude of voltage.
Simultaneously, micro-wave oven central control unit output order makes the micro-wave oven can operate as normal.
After being finished, return step S21.
Step S24, display alarm information, and micro-wave oven is quit work or lock the work of micro-wave oven.
The micro-wave oven central control unit drives the warning message that display unit shows electric voltage exception, also can while display power supply magnitude of voltage.
Simultaneously, the micro-wave oven central control unit quits work micro-wave oven or locks micro-wave oven work.If micro-wave oven is in running order, then output quits work to instruct micro-wave oven is quit work; If micro-wave oven is not in running order, then exports lock instruction and make micro-wave oven can't start work.
Described micro-wave oven control of working unit can't obtain work order, and can't drive workpiece work such as microwave oven magnetic.
After above-mentioned being finished, return step S21.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1, a kind of microwave oven supply power electric voltage observation circuit is characterized in that, comprising:
Sample circuit is used for the microwave oven supply power voltage sample; It is input as microwave oven supply power voltage, is output as the sampled signal of supply voltage;
The micro-wave oven central control unit is used for calculating supply voltage value according to described sampled signal, and this voltage is compared with the micro-wave oven operating voltage range, if supply voltage is in the normal range (NR) of operating voltage, then controls the micro-wave oven operate as normal; If supply voltage exceeds the normal range (NR) of supply voltage, then output stops the instruction of micro-wave oven work or the instruction of output locking micro-wave oven work;
The micro-wave oven control of working unit is used to receive the instruction of micro-wave oven central control unit, according to the control of this instruction realization to micro-wave oven work; If the instruction of micro-wave oven central control unit output stopping micro-wave oven work, then its control micro-wave oven device work quits work.
2, micro-wave oven electric voltage observation circuit according to claim 1 is characterized in that, also comprises display unit, is used to receive the display driver information of described micro-wave oven central control unit, the relevant information of display power supply voltage; When described micro-wave oven central control unit judges that supply voltage is in normal range (NR), then the normal display driver information of output supply voltage is to described display unit, exceed normal range (NR) if judge supply voltage, then the unusual display driver information of output supply voltage is to described display unit.
3, microwave oven supply power electric voltage observation circuit according to claim 2 is characterized in that, described micro-wave oven central control unit is according to the display driver information of calculating the supply voltage output supply voltage value that obtains; Described display unit receives the display driver information of described supply voltage value, the magnitude of voltage of display power supply voltage in view of the above.
4, according to each described micro-wave oven electric voltage observation circuit of claim 1 to 3, it is characterized in that described sample circuit comprises transforming circuit, rectification circuit, bleeder circuit;
Described transforming circuit is used for supply voltage is changed into the voltage and the output of the voltage range that is suitable for detecting;
Described rectification circuit, the voltage commutation that is used for described transforming circuit output is DC voltage output;
Described bleeder circuit is used for the sampled signal as supply voltage after the DC voltage dividing potential drop of described rectification circuit output is exported.
5, micro-wave oven electric voltage observation circuit according to claim 4 is characterized in that, described transforming circuit is a low-tension transformer, and its primary coil connects microwave oven supply power voltage, and secondary coil output is through the voltage after the transformation.
6, micro-wave oven electric voltage observation circuit according to claim 4 is characterized in that, described rectification circuit comprises: bridge rectifier and diode; The input of described bridge rectifier receives the output voltage of described transforming circuit, and output head anode connects the anode of described diode, and negative pole connects power supply ground; This rectification circuit is output as the negative electrode of described diode and the DC voltage between the power supply ground.
7, micro-wave oven electric voltage observation circuit according to claim 4 is characterized in that, described bleeder circuit comprises first resistance and second resistance; Wherein first resistance, one end connects the positive pole of rectifier power source output voltage, and the other end is connected to power supply ground by second resistance; Described sampled signal is the voltage between first resistance and the second resistance common port and the power supply ground.
8, a kind of guard method of microwave oven supply power electric voltage exception is characterized in that, comprising:
81) current supply voltage is sampled;
82) acquisition supply voltage sampled value and the normal voltage scope of having set are compared, judge whether in the normal voltage scope; If then enter step 83); If not, then enter step 84)
83) make the micro-wave oven operate as normal; And return 81)
84) output supply voltage abnormal signal quits work micro-wave oven or locks the work of micro-wave oven; And return 81).
9, method according to claim 8 is characterized in that, described step 83) also comprise the normal information of display unit display power supply voltage; Described step 84) also comprises the warning message of display unit display power supply electric voltage exception.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510125953 CN1979006A (en) | 2005-11-30 | 2005-11-30 | Microwave-oven power-supply voltage monitoring circuit and method for protecting abnormal power-supply voltage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510125953 CN1979006A (en) | 2005-11-30 | 2005-11-30 | Microwave-oven power-supply voltage monitoring circuit and method for protecting abnormal power-supply voltage |
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| CN1979006A true CN1979006A (en) | 2007-06-13 |
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| CN 200510125953 Pending CN1979006A (en) | 2005-11-30 | 2005-11-30 | Microwave-oven power-supply voltage monitoring circuit and method for protecting abnormal power-supply voltage |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103845025A (en) * | 2012-11-28 | 2014-06-11 | 佛山市顺德区美的洗涤电器制造有限公司 | Dish washing machine and input voltage detection and protection circuit and method thereof |
| CN104104059A (en) * | 2014-07-29 | 2014-10-15 | 广东美的厨房电器制造有限公司 | Microwave oven, safety protection circuit and safety protection control method thereof |
| CN104280598A (en) * | 2014-09-19 | 2015-01-14 | 合肥荣事达三洋电器股份有限公司 | Power supply detection method and detection system for microwave oven |
| CN107831689A (en) * | 2017-10-31 | 2018-03-23 | 惠州鼎宝金属制品有限公司 | A kind of intelligence control system for oven |
| CN108235480A (en) * | 2016-12-15 | 2018-06-29 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and its protective device |
-
2005
- 2005-11-30 CN CN 200510125953 patent/CN1979006A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103845025A (en) * | 2012-11-28 | 2014-06-11 | 佛山市顺德区美的洗涤电器制造有限公司 | Dish washing machine and input voltage detection and protection circuit and method thereof |
| CN103845025B (en) * | 2012-11-28 | 2016-08-03 | 佛山市顺德区美的洗涤电器制造有限公司 | Dish-washing machine and input voltage measurement thereof and protection circuit and method |
| CN104104059A (en) * | 2014-07-29 | 2014-10-15 | 广东美的厨房电器制造有限公司 | Microwave oven, safety protection circuit and safety protection control method thereof |
| CN104280598A (en) * | 2014-09-19 | 2015-01-14 | 合肥荣事达三洋电器股份有限公司 | Power supply detection method and detection system for microwave oven |
| CN108235480A (en) * | 2016-12-15 | 2018-06-29 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and its protective device |
| CN108235480B (en) * | 2016-12-15 | 2024-07-05 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and protection device thereof |
| CN107831689A (en) * | 2017-10-31 | 2018-03-23 | 惠州鼎宝金属制品有限公司 | A kind of intelligence control system for oven |
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