CN201499340U

CN201499340U - High-accuracy program-controlled output current circuit device of induction cooker

Info

Publication number: CN201499340U
Application number: CN2009202348733U
Authority: CN
Inventors: 张铸; 史祖匡; 邵军; 沈敏
Original assignee: SUZHOU CHUNHE ELECTRIC CO Ltd
Current assignee: SUZHOU CHUNHE ELECTRIC CO Ltd
Priority date: 2009-08-12
Filing date: 2009-08-12
Publication date: 2010-06-02
Anticipated expiration: 2019-08-12

Abstract

The utility model relates to a high-accuracy program-controlled output current circuit device of an induction cooker. The device comprises a single-chip microcomputer which comprises a sampling module used for outputting current samplings, a control logic module used for controlling the induction cooker, an output module used for outputting current, and a feedback module used for connecting the output module and the sampling module and feeding back information. The device is characterized in that the single-chip microcomputer further comprises a storage unit used for storing current regulation information, and a storage processing module used for processing the storage unit; and the storage processing module is connected with the control logic module connected a human-computer interface module used for inputting and displaying data. The device utilizes the memory function of the storage unit at the inner part of the single-chip microcomputer in the induction cooker, regulates and outputs current through the human-computer interface module, cancels a variable resistor in the circuit, and has the advantages of low cost, high accuracy, and simple and convenient regulation.

Description

High-precision program control output current circuit device of induction cooker

(1) technical field

The utility model relates to the control circuit of electromagnetic oven output current, is specially a kind of high-precision program control output current circuit device of induction cooker.

(2) background technology

For the control mode of electromagnetic oven output current, mainly be to utilize variable resistor to carry out mechanical adjustment at present.Variable resistor generally is the variable resistor of carbon film, because structure and material has the restriction (about 20 times) of access times, precision is also lower, so it is very unstable to adjust output current in process of production, variable resistor also is easier to damage.When adjusting variable resistor, if product is installation, will reserve so and regulate the space, will require producers very skilled like this, but, more can have influence on the speed of production line on-line testing because producers' hand can cause the adjustment accuracy error of final output current big in the shake of leaving moment; Product finds that when final assembling individual product output current deviation is big if adjustment back assembling earlier will bring, only opens product and readjusts, thus the speed of production of having a strong impact on.In addition, because variable resistor is packing less, the dust of operational environment and steam can cause variable-resistance resistance value to change, and finally cause output current to change, and make system failure.

(3) summary of the invention

At the problems referred to above, the utility model provides a kind of high-precision program control output current circuit device of induction cooker, and this circuit is adjusted the precision height, and can not influence the on-line testing speed of production line.

Its technical scheme is such:

High-precision program control output current circuit device of induction cooker, it comprises single-chip microcomputer, described single-chip microcomputer comprises the sampling module that is used for the output current sampling, be used to control the control logic module of electromagnetic oven, be used for the output module of output current and the feedback module that is used for feedback information that output module is connected with sampling module, it is characterized in that: also comprise in the described single-chip microcomputer being used to the stores processor module of preserving the memory cell of Current Regulation information and being used for described memory cell is handled, described stores processor module is connected with described control logic module, and described control logic module is connected with being used to import with the human-computer interface module of video data.

Its further technical scheme is:

Described memory cell is the NVM or the FLASH of described single-chip microcomputer inside; The numerical value a that described sampling module is gathered, the storing value b of described memory cell obtains the c value by formula c=f*a/b, and wherein f is an any number, repaiies the storing value b of described memory cell by described human-computer interface module, and the c value is conformed to current setting value.

The utility model utilizes the memory function of the memory cell of single-chip microcomputer inside in the electromagnetic oven, adjusts output current by human-computer interface module, has cancelled the variable resistor in the circuit, and cost is low, precision is high, adjustment is easy.

(4) description of drawings

Fig. 1 is the position view of the utility model in electromagnetic oven circuit;

Fig. 2 is a structured flowchart of the present utility model;

Fig. 3 is an electrical schematic diagram of the present utility model.

(5) embodiment

As shown in Figure 1, be the utility model residing position in electromagnetic oven circuit, the utility model is used for that the value that current sample processing back quantizes is sent into comparator with current setting value and compares.

As shown in Figure 2, the utility model comprises single-chip microcomputer, this single-chip microcomputer comprises the sampling module that is used for the output current sampling, be used to control the control logic module of electromagnetic oven, be used for the output module of output current and the feedback module that is used for feedback information that output module is connected with sampling module, also comprise in this single-chip microcomputer and be used to the stores processor module of preserving the memory cell of Current Regulation information and being used for memory cell is handled, the stores processor module is connected with control logic module, and control logic module is connected with being used to import with the human-computer interface module of video data.Described memory cell is the NVM or the FLASH of single-chip microcomputer inside.

Below in conjunction with Fig. 3 principle of the present utility model is further described:

1, current sample:

Electric current can't directly be read, and only converts voltage to.T1 is a high power valve, and when the T1 conducting, supply voltage U1 constitutes the loop by load RL, T1 and sampling resistor R1 and has electric current I 1 to produce.I1 forms voltage U 2 on sampling resistor R1, on negative just down, U2 is undertaken obtaining voltage U 3 after the RC filtering by R2 and C1, U3 oppositely amplifies by amplifier OP and obtains U4, the filtering that U4 advanced R4 and C2 enters single-chip microprocessor MCU, sample conversion is finished.

2, AD conversion and data processing:

After entering MCU, by the value of obtaining a after the digitlization of AD sample variance, MCU sends the instruction value of obtaining b from NVM or FLASH, obtains the c value by formula c=f*a/b then.The f value is the same with the initial value of b.

In order accurately to control output current, the b value adopts the counting of 16 precision, adopts 32768 for up-down adjustment makes things convenient for denominator, so b just can regulate arbitrarily from 0 to 65535, precision can reach 1/32768 so.That is to say that when being 10A electric current when output step-length can reach 0.3 milliampere of (promptly 3/10000ths) adjusting and reach High Accuracy Control.Because b adopts 16 preservations, for balance plus-minus number of times initial value is decided to be 32768.

3, control logic:

When c when setting current value, reduce to export control signal d high level time and reach the purpose that reduces output current I1.When c when setting electric current, increase output control signal d high level time and reach the purpose that strengthens output current I1.

4, man-machine interface control

Operating personnel enter the Current Regulation pattern after by the regulating command of man-machine interface input current, read the value b of NVM or FLASH, and be kept at the e unit, deposit among NVM or the FLASH to replace original value b after e added and subtracted processing, to reach the control purpose, whenever add one or subtract one and can control output current and reduce or increase by 3/10000ths.

The utility model also can be used for the large power, electrically source current, among the high-power firing equipment system. The utility model is determined output current according to actual measured value, regulates by program and man-machine interface, solves the low problem of the slow precision of speed of production line on-line testing, the characteristic and advantage with low cost, high stability.

Claims

1. high-precision program control output current circuit device of induction cooker, comprise single-chip microcomputer, described single-chip microcomputer comprises the sampling module that is used for the output current sampling, be used to control the control logic module of electromagnetic oven, be used for the output module of output current and the feedback module that is used for feedback information that output module is connected with sampling module, it is characterized in that: also comprise in the described single-chip microcomputer being used to the stores processor module of preserving the memory cell of Current Regulation information and being used for described memory cell is handled, described stores processor module is connected with described control logic module, and described control logic module is connected with being used to import with the human-computer interface module of video data.

2. high-precision program control output current circuit device of induction cooker according to claim 1 is characterized in that: described memory cell is the NVM or the FLASH of described single-chip microcomputer inside.

3. high-precision program control output current circuit device of induction cooker according to claim 1, it is characterized in that: the numerical value a that described sampling module is gathered, the storing value b of described memory cell, obtain the c value by formula c=f*a/b, wherein f is an any number, repair the storing value b of described memory cell by described human-computer interface module, the c value is conformed to current setting value.