CN201355876Y - Power automatic calibration circuit of electromagnetic oven - Google Patents
Power automatic calibration circuit of electromagnetic oven Download PDFInfo
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- CN201355876Y CN201355876Y CNU2008202349765U CN200820234976U CN201355876Y CN 201355876 Y CN201355876 Y CN 201355876Y CN U2008202349765 U CNU2008202349765 U CN U2008202349765U CN 200820234976 U CN200820234976 U CN 200820234976U CN 201355876 Y CN201355876 Y CN 201355876Y
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Abstract
The utility model relates to a power automatic calibration circuit of an electromagnetic oven, which comprises a current detection and acquisition circuit consisting of a current sampling circuit, an amplifier and an A/D converter, and a voltage detection and acquisition circuit consisting of a voltage sampling circuit and the A/D converter, a memory, a CPU and the like; and a control program, an operating program and current or power calibration parameters are resided and stored in the memory. When the power automatic calibration circuit is debugged, the CPU calculates current or power calibration parameters by the set current test value and the detected voltage value of a current signal and stores the current or power calibration parameters; and when in work, the calibration parameters are used to automatically calibrate the current power and current and used as accurate reference for the adjustment and protection of the power of the electromagnetic oven. The calibration circuit can replace the conventional calibration mode of a potentiometer, save the cost and improve the reliability.
Description
Technical field
The utility model relates to electromagentic furnace technology, specifically is a kind of electromagnetic oven power automatic calibration circuit.
Background technology
Common electromagnetism furnace gauge is calculated electromagnetic oven power and is generally adopted detection work at present voltage, operating current, by power=voltage * current formula, calculates current power.
And current sampling circuit generally is converted to voltage signal by instrument transformer or sampling resistor sample rate current small-signal, through amplifying, calculates again.Because this mode error ratio is bigger, according to straight line expression formula y=kx+b (k ≠ 0), generally to utilize potentiometer to regulate, with the coefficient k in the correction formula, this mode has increased potentiometer, in transportation and use, potentiometer all is easy to occur the resistance value skew, causes the electromagnetic oven power error bigger.
In addition, the product information of common electromagnetic oven is generally passed through the paster form, expression product type, serial number, date of manufacture or bar code information etc. on fuselage, packing case, but the counterfeit difficulty of this mode is low, just can counterfeit best brand of product by simple printing paster, technology of the package.
Summary of the invention
For overcoming the above-mentioned defective that existing electromagentic furnace technology exists, the utility model provides a kind of electromagnetic oven power automatic calibration circuit, with the calibration of power that satisfies electromagnetic oven, the needs that realtime power calculates and controls.
Electromagnetic oven power automatic calibration circuit of the present utility model comprises:
One current detecting Acquisition Circuit, it comprises current sampling circuit, amplifier and A/D converter, amplifier is connected between this current sampling circuit and A/D converter one input;
One voltage detecting Acquisition Circuit, it comprises voltage sampling circuit and described A/D converter, voltage sampling circuit output connects another input of A/D converter;
One memory is used for storage control program, operation program and electric current or calibration of power parameter; And,
One CPU, the output of the described A/D converter of an input termination of this CPU, described memory is connected with CPU; CPU calculates electric current or calibration of power parameter with the magnitude of voltage of the current signal of setting testing current value and detection, and is stored in described memory, and then adopts this calibration parameter that current electric current and current power are calibrated automatically.
Wherein, the step that CPU calculates electric current or calibration of power parameter comprises: two the testing current values of electromagnetic oven in its current margin are reached under the zero situation move, detect the magnitude of voltage of the current signal under three kinds of running statuses; Described CPU adopts described three groups of data by formula y
(i)=k * i+b design factor k and intercept b, and store this coefficient k and intercept b.
During work, the step that CPU calibrates current electric current and current power comprises: CPU adopts the magnitude of voltage y of the current current signal that is detected by the current detecting Acquisition Circuit
(i)And described k and b, by formula i=1/k * y
(i)-b/k calculates current current signal i, and then calculates current power with this current current signal and current voltage signal.
Described amplifier, A/D converter, CPU and memory are integrated in the same chip.
The utility model has proposed the electromagnetic oven power automatic calibration scheme first, it will be built in the chip in the automated power calibration procedure module, when electromagnetic oven is produced according to setup parameter collection automatically, rated output or correcting current parameter, and this calibration parameter is recorded in the built-in chip type memory, and this memory has the power-failure memory function.In electromagnetic oven when work,, the calibration parameter that CPU reads in the built-in chip type memory is calibrated current signal, and then calculates the current power value with voltage signal, for CPU provides accurate foundation to adjustment, the protection of electromagnetic oven power.
The utility model can replace conventional hardware potentiometer calibrating mode, cost savings, and product reliability improves.
Amplifier, A/D converter, CPU and memory in its automatic calibration of power circuit is integrated in the same chip, the chip integration height, and the peripheral applications circuit is simple, greatly reduces production, maintenance difficulty and cost.
Its store memory contains the electromagnetic oven product information, by button operation, shows product information on charactron or LED, and information privacy is effective, increases the counterfeit difficulty of product greatly.
Description of drawings
Fig. 1 is a theory diagram of the present utility model;
Fig. 2 is the embodiment circuit diagram.
Embodiment
Below in conjunction with accompanying drawing the utility model is further specified.
With reference to Fig. 1,2, shown in the electromagnetic oven power automatic calibration circuit, mainly comprise: current detecting Acquisition Circuit, voltage detecting Acquisition Circuit, memory and Digital Logic processor controls CPU.
The current detecting Acquisition Circuit comprises current sampling circuit, amplifier and A/D converter, and amplifier is connected between this current sampling circuit and A/D converter one input.Wherein, current sampling circuit comprises constantan wire resistance R K between being connected on rectifier bridge BG1 and IGBT draining and the resistance R 8 that is connected with constantan wire resistance R K, resistance R 8 one termination amplifier ins (being the 13Pin of CHK-S008 chip among Fig. 2), connect parallel resistor R12 and capacitor C 7 feedback circuits between amplifier in and the output (being the 12Pin of CHK-S008 chip among Fig. 2), amplifier in connects capacitor C 8 to a ground constantan wire resistance R K1 capacitor C 5 in parallel.
The voltage detecting Acquisition Circuit comprises voltage sampling circuit and described A/D converter, and voltage sampling circuit output connects another input of A/D converter.Wherein, voltage sampling circuit comprises diode D1, D2, be connected in divider resistance R17, R18 between diode D1 and D2 negative pole and the ground, diode D1, D2 positive pole meet rectifier bridge BG1 two respectively and exchange incoming line, resistance R 18 shunt capacitance C22, the common port of resistance R 17, R18 output voltage signal to A/D converter one input (being the 7Pin of CHK-S008 chip among Fig. 2).
The output of the described A/D converter of Digital Logic processor controls CPU one input termination, memory answers port to be connected with the CPU item, and memory stores has the linear gauging program of control, operation program and current amplifier etc.Memory is a nonvolatile memory, has the power-failure memory function.
Above-mentioned amplifier, A/D converter, Digital Logic processor controls CPU and memory are integrated in a SoC (the System on a Chip) chip, as the CHK-S008 chip among Fig. 2.
Wherein, an interval stores the correcting current parameter in the nonvolatile memory in the CHK-S008 chip, the power of calibration electromagnetic oven when being used for CPU operation calibration procedure.This non-volatile memory configuration is useful on the memory block of storage products information, can store the electromagnetic oven product information in this memory block, as: information such as product bar code, supplier number, serial number, date of manufacture.By button operation, on charactron or LED, show product information, can strengthen the information privacy effect, increase the counterfeit difficulty of product greatly.
Adopt above-mentioned electromagnetic oven power automatic calibration circuit to realize that the automatic calibration of power process is as follows:
1), in the current margin of electromagnetic oven, chooses two testing current value i1, i2, major loop is moved under this testing current value i1, i2 and zero situation successively, gather current signal under described three kinds of running statuses respectively by above-mentioned current detecting Acquisition Circuit, and store the output voltage values y of this current detecting Acquisition Circuit
(i 1), y
(i 2), y
(i 0)
CPU adopts described i1 and y
(i 1), i2 and y
(i 2)Two groups of data are by formula y
(i)=k * i+b (k ≠ 0) calculates coefficient k, and the testing current value is zero pairing magnitude of voltage y
(i 0)Be intercept b, this coefficient k and intercept b are stored in the memory;
2), electromagnetic oven when work, CPU adopts the magnitude of voltage y of the current current signal that is detected by above-mentioned current detecting Acquisition Circuit
(i), and described memory in coefficient k and intercept b, by formula i=1/k * y
(i)-b/k calculates current current signal i, and then calculates the current power value with this current current signal and the current voltage signal that detected by above-mentioned voltage detecting Acquisition Circuit.
Claims (8)
1, a kind of electromagnetic oven power automatic calibration circuit comprises:
One current detecting Acquisition Circuit, it comprises current sampling circuit, amplifier and A/D converter, amplifier is connected between this current sampling circuit and A/D converter one input;
One voltage detecting Acquisition Circuit, it comprises voltage sampling circuit and described A/D converter, voltage sampling circuit output connects another input of A/D converter;
One memory is used for storage control program, operation program and electric current or calibration of power parameter; And,
One CPU, the output of the described A/D converter of an input termination of this CPU, described memory is connected with CPU; CPU calculates electric current or calibration of power parameter with the magnitude of voltage of the current signal of setting testing current value and detection, and is stored in described memory, and then adopts this calibration parameter that current electric current and current power are calibrated automatically.
2, according to the electromagnetic oven power automatic calibration circuit of claim 1, it is characterized in that: described amplifier, A/D converter, CPU and memory are integrated in the same chip.
3, according to the electromagnetic oven power automatic calibration circuit of claim 1 or 2, it is characterized in that: described current sampling circuit comprises constantan wire resistance R K between being connected on rectifier bridge and IGBT draining and the resistance R 8 that is connected with constantan wire resistance R K, current sampling circuit output connects amplifier in, connects parallel resistor and capacitive feedback circuit between amplifier in and the output.
4, according to the electromagnetic oven power automatic calibration circuit of claim 3, it is characterized in that: described voltage sampling circuit comprises diode D1, D2, be connected in divider resistance R17, R18 between diode D1 and D2 negative pole and the ground, diode D1, D2 positive pole connect rectifier bridge two respectively and exchange incoming line, resistance R 18 shunt capacitance C22, the common port of resistance R 17, R18 outputs voltage signal to A/D converter one input.
5, according to the electromagnetic oven power automatic calibration circuit of claim 1 or 2, it is characterized in that: described voltage sampling circuit comprises diode D1, D2, be connected in divider resistance R17, R18 between diode D1 and D2 negative pole and the ground, diode D1, D2 positive pole connect rectifier bridge two respectively and exchange incoming line, resistance R 18 shunt capacitance C22, the common port of resistance R 17, R18 outputs voltage signal to A/D converter one input.
6, according to the electromagnetic oven power automatic calibration circuit of claim 1 or 2, it is characterized in that: described memory is a nonvolatile memory.
7, according to the electromagnetic oven power automatic calibration circuit of claim 1 or 2, it is characterized in that: be provided with the product information memory block that is used to store the electromagnetic oven product information in the described memory.
8, according to the electromagnetic oven power automatic calibration circuit of claim 1 or 2, it is characterized in that: described amplifier, A/D converter, CPU and memory are integrated in the CHK-S008 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202349765U CN201355876Y (en) | 2008-12-12 | 2008-12-12 | Power automatic calibration circuit of electromagnetic oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202349765U CN201355876Y (en) | 2008-12-12 | 2008-12-12 | Power automatic calibration circuit of electromagnetic oven |
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| Publication Number | Publication Date |
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| CN201355876Y true CN201355876Y (en) | 2009-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2008202349765U Expired - Fee Related CN201355876Y (en) | 2008-12-12 | 2008-12-12 | Power automatic calibration circuit of electromagnetic oven |
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| CN (1) | CN201355876Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010066102A1 (en) * | 2008-12-12 | 2010-06-17 | 深圳市鑫汇科科技有限公司 | Method and circuit for automatic calibration of the power of electromagnetic oven |
| CN109194123A (en) * | 2018-11-19 | 2019-01-11 | 晶晨半导体(上海)股份有限公司 | A kind of PWM voltage regulator circuit |
| CN109695899A (en) * | 2017-10-24 | 2019-04-30 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating cooking utensil and its heating power bearing calibration and device |
| CN117389369A (en) * | 2023-12-06 | 2024-01-12 | 徐州科亚机电有限公司 | Current calibration device and method for detecting electric motorcycle controller |
-
2008
- 2008-12-12 CN CNU2008202349765U patent/CN201355876Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010066102A1 (en) * | 2008-12-12 | 2010-06-17 | 深圳市鑫汇科科技有限公司 | Method and circuit for automatic calibration of the power of electromagnetic oven |
| CN109695899A (en) * | 2017-10-24 | 2019-04-30 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating cooking utensil and its heating power bearing calibration and device |
| CN109695899B (en) * | 2017-10-24 | 2020-03-03 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating cooking utensil and heating power correction method and device thereof |
| CN109194123A (en) * | 2018-11-19 | 2019-01-11 | 晶晨半导体(上海)股份有限公司 | A kind of PWM voltage regulator circuit |
| CN117389369A (en) * | 2023-12-06 | 2024-01-12 | 徐州科亚机电有限公司 | Current calibration device and method for detecting electric motorcycle controller |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091202 Termination date: 20121212 |