CN100508669C

CN100508669C - Power supply control circuit structure and method for electronic cooker

Info

Publication number: CN100508669C
Application number: CNB2005100915590A
Authority: CN
Inventors: 刘源河; 陈俊雄; 林俊谷
Original assignee: Holtek Semiconductor Inc
Current assignee: Holtek Semiconductor Inc
Priority date: 2005-08-23
Filing date: 2005-08-23
Publication date: 2009-07-01
Anticipated expiration: 2025-08-23
Also published as: CN1921708A

Abstract

A power supply control circuit structure and method of an electronic cooker, comprising an input unit; an output unit; the micro control unit is used for processing the input unit and the output unit and detecting and processing signals of synchronization, oscillation, overload voltage and overload current; a power supply circuit; the exciting coil circuit is used for power switching adjustment of the control circuit of the electronic cooker; an output circuit of the insulated gate bipolar transistor to drive the exciting coil circuit; the drive circuit of the insulated gate bipolar transistor is used as a voltage conversion interface of the micro control unit and the output circuit of the insulated gate bipolar transistor and drives the insulated gate bipolar output circuit. When the programmable pulse wave generator is started each time, the programmable pulse wave generator provides output of a primary pulse wave, and the pulse wave width can be set by software to achieve the purposes of power adjustment and protection control.

Description

The structure and method for electrical source control circuit of electronic cook ware

Technical field

The present invention relates to a kind of structure and method for electrical source control circuit of electronic cook ware, particularly a kind of structure and method for electrical source control circuit step of utilizing micro-control unit inside that the electronic cook ware of at least one group of above programmable pulse baud generator is set.

Background technology

Usually, 3C Product in the electronic industry occupies great status in modern's life, wherein the consumer electronics trend is light, thin, short, little, and has high practicality, so being subjected to ordinary consumer favors, has splendid business opportunity, for example: electromagnetic oven or the electric cooker (product of similar electronic pot, but possess the functions that boil arranged more) etc. electronic cook ware, it only needs to provide domestic power supply, can carry out the heating work of food, inconvenience place of using traditional gas oven of having forgone (for example: methane gas has danger ... etc.), and its price is also very cheap, for general family can easily purchase.

And the binomial control technology of power control and protection control is the use often of electronic cook ware (for example: electromagnetic oven, electric cooker) institute; see also shown in Figure 1; it is the functional-block diagram of known electromagnetic oven, and the member of its hardware includes: the drive circuit 15 of micro-control unit 11, input unit 12, output unit 13, circuit for detecting 14, insulated gate bipolar transistor, the output circuit 16 of insulated gate bipolar transistor, excitation coil circuit 17 and power circuit 18.Wherein this input unit 12 also includes: function button 121, temperature detecting device 122.Wherein this output unit 13 also includes: fan 131, buzzer 132 and display unit 133.By above-mentioned member with hardware directly detect handle as: synchronous circuit; oscillating circuit; voltage overload; current overload ... wait electronic signal that circuit provides; and the control circuit of hardware must utilize four groups of above comparators to detect; its control action need use micro-control unit 11 (Micro Controller Unit; MCU) do an execution; in addition; this micro-control unit 11 more need cooperate many group comparators and other peripheral component to carry out the action of power control and protection jointly; the major defect of this structure is that control loop is comparatively complicated; and its manufacturing cost is also comparatively expensive, is engaged in the space that this journey dealer is improved so have wait.

Summary of the invention

Based on the shortcoming that solves the above known technology, the invention provides a kind of structure and method for electrical source control circuit of electronic cook ware, main purpose of the present invention is to utilize the micro-control unit that has a programmable pulse baud generator and analog/digital converter in the micro-control unit, by this programmable pulse baud generator, can directly start or stop the output of control programmable pulse baud generator by the outside input.When each startup, the programmable pulse baud generator provides the output of pulsatile once ripple, and its impulse wave width can reach power adjustment and protection control purpose by software set.

Another object of the present invention is for when detecting overload current, overload voltage or excess temperature; system can be by stopping to control the output of programmable pulse baud generator; or the impulse wave width output of regulating the programmable pulse baud generator is protected the purpose of controlling to reach; and can further reach simplification circuit design and all Multilateral parts, and the purpose that manufacturing cost is reduced.

In order to achieve the above object, the power control circuit structure of a kind of electronic cook ware of the present invention, it includes: an input unit is used for the input parameter of design temperature, power and time; One output unit is used for the input parameter of displays temperature, power and time; Have the micro-control unit of programmable pulse baud generator in one, be used to handle input unit, output unit and detect the signal of handling synchronously, shaking, transship voltage, overload current; One power circuit provides the needed power supply of power control circuit of electronic cook ware; One excitation coil circuit is used for switching adjustment as the power of electronic cook ware control circuit; The output circuit of one insulated gate bipolar transistor is to drive excitation coil circuit; And the drive circuit of an insulated gate bipolar transistor, as the voltage transitions interface of the output circuit of micro-control unit and insulated gate bipolar transistor, and drive the output circuit of insulated gate bipolar transistor.

According to the power control circuit structure of described electronic cook ware, wherein this input unit also includes a function button and a temperature detecting device.

According to the power control circuit structure of described electronic cook ware, wherein this output unit also includes a fan, a buzzer and a display unit.

According to the power control circuit structure of described electronic cook ware, wherein this micro-control unit also includes a power detecting circuit.

According to the power control circuit structure of described electronic cook ware, this programmable pulse baud generator includes two comparators, a timer, a pre-device and the control unit of removing.This micro-control unit also includes: at least one group analog/digital converter; And a central processing unit core heart, be used for the control unit of control and treatment programmable pulse baud generator.

According to the power control circuit structure of described electronic cook ware, wherein this electronic cook ware is an electromagnetic oven.

According to the power control circuit structure of described electronic cook ware, wherein this electronic cook ware is an electric cooker.

In order to achieve the above object, the micro-control unit process control method of a kind of electronic cook ware of the present invention, it includes the following step:

(1) one comparator provides the signal Controlling Source of startup, to control as starting the output of programmable pulse baud generator, and utilize a timer to come timing, the time span of output is controlled by timer and the pre-device that removes, and timer and the pre-setting numerical value that removes device can be set by software, when the timer timing finished, the programmable pulse baud generator stopped output at once;

(2) this comparator provides the signal that stops, as the output control that stops the programmable pulse baud generator;

(3) timer cooperates the pre-control that removes device as the output time length of programmable pulse baud generator; And

(4) control unit is the part of whole programmable pulse baud generator major control, controls, stops forbidden energy or activation control and output of software control programmable pulse baud generator or detecting programmable pulse baud generator output state so that comparator forbidden energy or activation control, pre-setting, startup forbidden energy or the activation that removes value and timer to be provided.

According to the micro-control unit process control method of described electronic cook ware, described control method is as follows:

The application that output stops as control programmable pulse baud generator of (1) first comparator, when the output of first comparator produces the drop edge, if forbidden energy and activation position (being called for short P0SPEN bit) are activations, then can directly stop the output of programmable pulse baud generator, first comparator is used to handle overload current and overload voltage, when load current moment is excessive, when promptly the instantaneous required electric current interior above the predetermined control scope of the electric current of process insulated gate bipolar transistor is excessive, will react on the voltage overload current point of current converter generation, overload current is connected to the negative terminal of first comparator of micro-control unit, when having served as live miscarriage and having given birth to voltage greater than the anode reference voltage of first comparator, the output of first comparator is by high step-down, and then control programmable pulse baud generator stops output; Identical, when excess temperature, make the negative terminal voltage of first comparator be higher than the anode reference voltage of first comparator, and the output of programmable pulse baud generator is stopped;

(2) second comparators start the application of programmable pulse baud generator output mainly as control, when second comparator output terminal produces the drop edge, if forbidden energy and activation position (being called for short P1SPEN bit) are when being activation, can directly start the output of programmable pulse baud generator, second comparator is used to handle synchronizing signal, when the insulated gate bipolar transistor end of excitation coil circuit is pressed when high potential reduces to zero, the programmable pulse baud generator will be activated once again, be that the insulated gate bipolar transistor end points (SYN-I) of synchronizing signal voltage is when being lower than DC power supply port (SYN-P) electrical voltage point, second comparator output terminal produces the drop edge, and second comparator will start the programmable pulse baud generator and do an output;

(3) the programmable pulse baud generator is undertaken outside hardware controls programmable pulse baud generator stops and starting by above-mentioned first comparator and second comparator, and program also can be carried out the control that the output of programmable pulse baud generator stops and starting by setting or detect soft switch bit (being called for short POST bit);

(4) the programmable pulse baud generator provides timer function, carries out timer and the pre-setting that removes the device value with software, can reach the control of decision programmable pulse baud generator output time length, reaches power adjustments; And

(5) cooperate above-mentioned steps (1) to step (4) point discloses hardware-initiated with stop, and the setting of software programmable pulse generator timer reaches power output control, synchronously, the detecting of signal of voltage, overload current of shaking, transship controls.

Pass through said structure, it is mainly and utilizes the micro-control unit that has a programmable pulse baud generator and analog/digital converter in the micro-control unit, by this programmable pulse baud generator, can directly start or stop the output of control programmable pulse baud generator by the outside input.When each startup, the programmable pulse baud generator provides the output of pulsatile once ripple, and its impulse wave width can reach power adjustment and protection control purpose by software set.For further the present invention being had more deep explanation, be by the following drawings, description of drawings and detailed description of the invention.

Description of drawings

Fig. 1 is the functional-block diagram of known electromagnetic oven;

Fig. 2 is the functional-block diagram of electronic cook ware power control circuit of the present invention;

Fig. 3 is a comparatively detailed functional block diagram of micro-control unit of the present invention inside.

Wherein, description of reference numerals is as follows:

11 micro-control units

12 input units

121 function buttons

122 temperature detecting devices

13 output units

131 fans

132 buzzers

133 display units

14 circuit for detecting

The drive circuit of 15 insulated gate bipolar transistors

The output circuit of 16 insulated gate bipolar transistors

17 excitation coil circuits

18 power circuits

21 micro-control units

211 comparators

212 analog/digital converters

The 213 central processing unit core hearts

214 programmable pulse baud generators

22 input units

221 function buttons

222 temperature detecting devices

23 output units

231 fans

232 buzzers

233 display units

The drive circuit of 24 insulated gate bipolar transistors

The output circuit of 25 insulated gate bipolar transistors

26 excitation coil circuits

27 power circuits

Embodiment

Now cooperate following graphic explanation detailed structure of the present invention and connection relationship thereof.

See also shown in Figure 2ly, it is the functional-block diagram of electronic cook ware power control circuit of the present invention, this electronic cook ware general reference electromagnetic oven and electric cooker, and its power control circuit includes:

One input unit 22 is used for the input parameter of design temperature, power and time, and wherein this input unit 22 also includes a function button 221 and a temperature detecting device 222;

One output unit 23 is used for the input parameter of displays temperature, power and time, and wherein output unit 23 also includes a fan 231, a buzzer 232 and a display unit 233;

One micro-control unit 21 is used to handle input unit 22, output unit 23 and detects the signal of handling synchronously, shaking, transship voltage, overload current;

One power circuit 27 provides the electronic cook ware control circuit needed power supply;

One excitation coil circuit 26 is used for switching adjustment as the power of electronic cook ware control circuit;

One insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, output circuit 25 IGBT) is to drive excitation coil circuit 26; And

The drive circuit 24 of one insulated gate bipolar transistor, as the voltage transitions interface of micro-control unit 21 with the output circuit 25 of insulated gate bipolar transistor, and the output circuit 25 of driving insulated gate bipolar transistor.

See also shown in Figure 3ly, Fig. 3 is micro-control unit of the present invention inside detailed functional block diagram comparatively, and this micro-control unit also includes:

At least one group of above analog/digital converter (A/D Converter) 212:

One programmable pulse baud generator (Programmable Pulse Generator, PPG) 214, it includes at least one group of above comparator 211, and (disclosed embodiment is two comparators, be respectively first comparator and second comparator, the function of this two comparator and the detailed description of action will be done a detailed description below), a timer (Timer), a pre-device and the control unit of removing; And

The one central processing unit core heart (CPU Core) 213 is used for the control unit of control and treatment programmable pulse baud generator.

The formation that mat is above-mentioned, relevant electronic signal that micro-control unit is detected is analyzed as follows:

(1) overload voltage (Over Voltage, OV): insulated gate bipolar transistor is in the ON/OFF control procedure, connected excitation coil circuit 26 may produce too high voltages, this voltage has got the input that live pressure (OV) is connected to the analog/digital converter (Analog/Digital Converter) 212 of micro-control unit 21 inside through electric resistance partial pressure, and this voltage overload is as the reference data of micro-control unit 21 power control.

(2) overload current (Over Current, OC): when load current is excessive, electric current through insulated gate bipolar transistor surpasses required electric current in the former predetermined control scope, current converter in the power circuit produces voltage and has got the live flow point after by electric resistance partial pressure, be connected in the C0VIN-end (the first comparator negative terminal) of micro-control unit 21, when having served as the living voltage of live miscarriage greater than COVIN+ end (the first comparator anode) voltage, the output of first comparator is converted to low (drop edge) by height, and then the output of control programmable pulse baud generator stops.

(3) power detecting circuit: from power circuit by current converter (the Current Transform of electric resistance partial pressure to obtain system voltage point SYSV and power circuit, CT) end, be used for dividing potential drop and obtain system power point SYSC, these 2 are connected to micro-control unit analog output mouth (Analog Inputs) respectively, with these 2 reference datas of trying to achieve performance number, be the foundation of adjusting programmable pulse baud generator impulse wave width adjustment as the power adjustment.

(4) synchronous circuit for detecting: at excitation coil circuit 26 two ends respectively by electric resistance partial pressure to take out SYN-P and SYN-I, SYN-P is the voltage of out-put supply end, this point is provided as the reference voltage of micro-control unit 21 comparator C 1VIN+ (the second comparator anode); SYN-I is for connecting the electrical voltage point of insulated gate bipolar transistor end, and this electrical voltage point is connected to micro-control unit 21 comparator C 1VIN-(the second comparator negative terminal) again as synchronizing signal voltage.When synchronizing signal voltage SYN-I is lower than the SYN-P electrical voltage point, second comparator will start the programmable pulse baud generator and do an output action.

By above-mentioned formation, the micro-control unit process control method of its electronic cook ware is as follows:

(1) second comparator provides the signal Controlling Source of startup (Restart), to control as starting the output of programmable pulse baud generator, and utilize a timer to come timing, the time span of output is controlled by timer and the pre-device that removes, and timer and the pre-setting numerical value that removes device can be set by software, when the timer timing finished, the programmable pulse baud generator stopped output at once.

(2) first comparators provide the signal that stops, as the output control that stops the programmable pulse baud generator.

(3) timer cooperates the pre-control that removes device as the output time length of programmable pulse baud generator.

(4) control unit is the part of whole programmable pulse baud generator major control, controls, stops forbidden energy or activation control and output of software control programmable pulse baud generator or detecting programmable pulse baud generator output state so that comparator forbidden energy (Disable) or activation (Enable) control, pre-setting, startup forbidden energy or the activation that removes value and timer to be provided.

Programmable pulse baud generator function and control method relevant for the special-purpose micro-control unit of electronic cook ware are as follows:

The application that (1) first comparator stops mainly as the output of control programmable pulse baud generator, when the output of first comparator produces drop edge (Falling Edge), if P0SPEN bit is activation, then can directly stop the output of programmable pulse baud generator.First comparator is used to handle overload current and overload voltage, when load current moment is excessive, when promptly the instantaneous required electric current interior above the predetermined control scope of the electric current of process insulated gate bipolar transistor is excessive, will react on the voltage overload current point of current converter generation, overload current is connected to the C0VIN-end (negative terminal of first comparator) of micro-control unit.When having served as live miscarriage and giving birth to voltage greater than C0VIN+ end (anode of first comparator) reference voltage, first comparator output (C0OUT) is by high step-down (Falling Edge), and then control programmable pulse baud generator output and stopping; Identical, when excess temperature, make C0VIN-end (negative terminal of first comparator) voltage be higher than the reference voltage of C0VIN+ end (anode of first comparator), and the output of programmable pulse baud generator is stopped.

(2) second comparators are used for control and start the output of programmable pulse baud generator, when second comparator output terminal (C1OUT) produces the drop edge, when being activation (Enable) as if P1SPEN bit, can directly start the output of programmable pulse baud generator.Second comparator is mainly the processing synchronizing signal, when the insulated gate bipolar transistor end of excitation coil circuit is pressed when high potential reduces to zero, the programmable pulse baud generator will be activated once again, be that synchronizing signal voltage SYN-I is when being lower than the SYN-P electrical voltage point, second comparator output terminal produces the drop edge, and second comparator will start the programmable pulse baud generator and do an output action.

(3) the programmable pulse baud generator is undertaken outside hardware controls programmable pulse baud generator stops and starting by above-mentioned first comparator and second comparator, and program also can be by setting or detecting POST bit carry out the control that the output of programmable pulse baud generator stops and starting.

(4) the programmable pulse baud generator provides timer (Timer) function, carry out timer and the pre-setting that removes the device value with software and can reach the decision programmable pulse baud generator output time length impulse wave width of programmable pulse baud generator (or be called) control, reach the purpose of power adjustments.

(5) cooperate above-mentioned (1) to (4) point discloses hardware-initiated with stop, and the setting of software programmable pulse generator timer reach power output control, synchronously, the purpose controlled of the detecting of signal of voltage, overload current of shaking, transship.

By above-mentioned Fig. 2,3 contents that disclosed, can understand the present invention can reach and utilize the micro-control unit that has a programmable pulse baud generator and analog/digital converter in the micro-control unit, by this programmable pulse baud generator, can directly start or stop the output of control programmable pulse baud generator by the outside input.When each startup, the programmable pulse baud generator provides the output of pulsatile once ripple, and its impulse wave width can reach power adjustment and protection control purpose by software set.In sum, architectural feature of the present invention and each embodiment disclose all in detail, and can fully demonstrate the present invention's all dark well-off progressive of executing on purpose and beneficial effect, the value that has industry, and be utilization not seen before on the market at present, spiritual described according to Patent Law, the present invention meets the requirement of patent of invention fully.

The above only is preferred embodiment of the present invention, and can not with the scope implemented of qualification the present invention, promptly the equalization of doing according to claim of the present invention generally changes and modifies, and all should still belong in the scope that patent of the present invention contains.

Claims

1. A power supply control circuit structure of an electronic cooker, which includes:

An input unit for setting input parameters of temperature, power and time;

An output unit for displaying input parameters of temperature, power and time;

A micro-control unit with a built-in programmable pulse wave generator for processing input units, output units, and detecting and processing signals of synchronization, oscillation, overload voltage, and overload current;

A power circuit, which provides the power required by the power control circuit of the electronic cooker;

An excitation coil circuit, used as a power switching adjustment of the control circuit of the electronic cooker;

an IGBT output circuit to drive the field coil circuit; and

A driving circuit of the IGBT is used as a voltage conversion interface between the micro control unit and the output circuit of the IGBT, and drives the output circuit of the IGBT.

2. The power control circuit structure of an electronic cooker according to claim 1, wherein the input unit further comprises a function key and a temperature detector.

3. The power control circuit structure of an electronic cooker according to claim 1, wherein the output unit further comprises a fan, a buzzer and a display unit.

4. The power control circuit structure of an electronic cooker according to claim 1, wherein the micro control unit further comprises a power detection circuit.

5. The power supply control circuit structure of electronic cooker according to claim 1, wherein the programmable pulse wave generator includes two comparators, a timer, a pre-divider and a control unit, and the micro control unit also includes have:

at least one set of analog/digital converters;

as well as

A central processing unit core for controlling and processing the control unit of the programmable pulse wave generator.

6. The power control circuit structure of an electronic cooker according to claim 1, wherein the electronic cooker is an induction cooker.

7. The power control circuit structure of an electronic cooker according to claim 1, wherein the electronic cooker is an electric rice cooker.

8. A micro control unit processing control method for an electronic cooker, comprising the following steps:

(1) A comparator provides a start-up signal control source as a start-up programmable pulse wave generator output control, and uses a timer to time the time. The output time length is controlled by the timer and the pre-divider, and the timer And the setting value of the predivider can be set by software, when the timer ends, the programmable pulse wave generator stops outputting immediately;

(2) The comparator provides a stop signal to stop the output control of the programmable pulse wave generator;

(3) the timer cooperates with the control of the output time length of the programmable pulse wave generator as the pre-divider; And

(4) The control unit is the main control part of the entire programmable pulse wave generator to provide one of the comparator disable and enable control, as well as the pre-divided value, timer setting, start disable or enable control , Stop, disable or enable control and software control the output of the programmable pulse wave generator or detect the output state of the programmable pulse wave generator.

9. The micro control unit processing control method of electronic cooker according to claim 8, said control method is as follows:

(1) The first comparator is used as an application to control the output stop of the programmable pulse wave generator. When the output terminal of the first comparator generates a falling edge, if the disable and enable bit P0SPEN bit is enabled, it can be directly Stop the output of the programmable pulse wave generator. The first comparator is used to deal with the overload current and overload voltage. When the load current is too large instantaneously, it will respond to the voltage overload current point generated by the current converter. The overload current is connected to the micro The negative terminal of the first comparator of the control unit, when the overload current generates a voltage greater than the positive terminal reference voltage of the first comparator, the output of the first comparator changes from high to low, and then controls the programmable pulse wave generator to stop output; the same When the temperature is over, the negative terminal voltage of the first comparator is higher than the positive terminal reference voltage of the first comparator, so that the output of the programmable pulse wave generator is stopped;

(2) The second comparator is mainly used to control and start the output of the programmable pulse wave generator. When the output terminal of the second comparator generates a falling edge, if the disable and enable bit P0P1SPEN bit is enabled, it can be started directly The output of the programmable pulse wave generator, the second comparator is used to process the synchronous signal, when the terminal voltage of the insulated gate bipolar transistor of the excitation coil circuit drops from high potential to zero, the programmable pulse wave generator will be started again, That is, when the voltage SYN-I of the synchronous signal IGBT terminal is lower than the voltage SYN-P voltage point of the output power supply terminal, the output terminal of the second comparator generates a falling edge, and the second comparator will start the programmable pulse wave generator to do an output;

(3) In addition to the above-mentioned first comparator and the second comparator to control the stop and start of the programmable pulse wave generator by hardware, the program can also set or detect the soft switch bit POST bit Control the output stop and start of the programmable pulse wave generator;

(4) The programmable pulse wave generator provides a timer function, and the setting of the timer and the prescaler value by software can achieve the control of the output time length of the programmable pulse wave generator to achieve power regulation; and

(5) Cooperate with the hardware start and stop disclosed in the above steps (1) to (4), and the setting of the software programmable pulse wave generator timer to achieve output power control, synchronization, oscillation, overload voltage, and overload current The detection control of the signal.