CN1265271C

CN1265271C - Keying scan circuit

Info

Publication number: CN1265271C
Application number: CN 02124209
Authority: CN
Inventors: 李丙龙
Original assignee: LG Electronics Tianjin Appliances Co Ltd
Current assignee: LG Electronics Tianjin Appliances Co Ltd
Priority date: 2002-07-12
Filing date: 2002-07-12
Publication date: 2006-07-19
Anticipated expiration: 2022-07-12
Also published as: CN1467414A

Abstract

The present invention discloses a keying scanning circuit. The keying scanning circuit comprises a microcontroller, a screen display device, a keyboard, positive scanning lines and grid scanning lines, wherein the screen display device is used for displaying signals, and the positive scanning lines and the grid scanning lines receive control display signals through the microcontroller and transmit the control display signals to the screen display device; switches are connected between the microcontroller and the screen display device through the positive scanning lines; before graphics or characters corresponding to some functions of microwaves input by a user are not output by the screen display device, the screen display device is provided with a positive port which can continuously emit scanning output waveforms according to the keying scanning circuit; in this way, the output signals of the positive port can be transmitted to an A/D option circuit of detection signals without transistors and diodes, and the processing procedure and the circuit structure are simplified. The port number of the positive ports in the keying scanning circuit of the present invention is increased, the connection of the keying scanning circuit and the keyboard is enlarged, thereby, a certain number of function keys can be guaranteed.

Description

Keying scan circuit

Technical field

The present invention relates to a kind of sweep circuit, the relevant keying scan circuit that can make the microwave oven safety ground output scanning output waveform that screen display unit is installed of further saying so.

Background technology

General micro-wave oven utilizes electric energy to drive well heater or magnetron, thereby utilizes microwave or heat to come cooking food.The most important thing is that micro-wave oven in a short period of time just can heat food, old family front yard, company, the utilization factor of local micro-wave oven such as fast food restaurant is very high.

Moreover, nearest several in the period of along with the improving constantly of living standard, use the number of micro-wave oven also to improve constantly, we can say that almost each family has all possessed micro-wave oven.Therefore the function of micro-wave oven is also gradually become strong, and can finish various culinary arts, heating, sterilization etc.And the function of micro-wave oven also can constantly improve.

A lot of function keys will be formed with in the multifunction microwave oven like this, micro-wave oven can be operated like a cork.Possessing as the general function option has automatic cooking, manually culinary art, and other thaw, and scald to wait option.Subfunction option as certain option of general function also has a lot of options.Cook puffed rice in addition in the subfunction such as the automatic cooking option of general function, culinary art egg cake, cooked potato, options such as culinary art batch Sa cake.Each function choosing-item just needs a button like this, therefore needs a lot of buttons.And press each function key and just can send corresponding signal.

Have a look at the keyboard scanning circuit of prior art below.

Fig. 1 a is the keyboard input circuit of prior art.Fig. 1 b is the keying scan circuit of prior art.

As shown in Figure 1a, Fig. 1 a is by the microcontroller 30 that comes the controlled microwave stove according to the signal that receives; Keyboard 35 with most keyswitches; The option current 40 of identification control signal constitutes.

In the keying scan circuit, keyboard 35 parts are made of matrix shape.The option current 40 that constitutes is connected in the option port P10 in the microcontroller 30 separately.

The annexation of control circuit can be found among careful observation Fig. 1, has most receiver port P1～P10 in the microcontroller, and the 1st resistance R 1` is connected among port P1 in the port, and above-mentioned the 1st resistance R 1` is connected in keyboard 35.

In the port in being arranged at microcontroller 30, No. two port P2 is connected with the 2nd resistance R 2`, and the 2nd resistance R 2` is connected in keyboard 35 again.As mentioned above, in the port in microcontroller 30, No. three port P3 is connected with the 3rd resistance R 3`, and No. four port P4 is connected with the 4th resistance R 4`, and five-port P5 is connected with the 5th resistance R 5`.The 3rd resistance R 3`, the 4th resistance R 4`, the other end of the 5th resistance R 5` are connected to again on the keyboard 35 corresponding positions.

Be arranged at No. six ports in the microcontroller 30, No. seven ports, No. eight ports, No. nine port is connected with keyboard 35.Keyboard 35 is the keyswitches that are made of 4 * 5 matrix shape, and the point of crossing of each matrix shape is formed with keyswitch.Keyswitch will be under the state of opening along with the user's beats, and along with opening of keyswitch, signal will be sent to microcontroller 30.The microcontroller 30 that receives signal will be handled the pairing function of button that the user beats, thus the action of controlled microwave stove.In addition, No. ten port P10 are the option port in the port of microcontroller 30.

The course of work of the keying scan circuit of being mentioned above describing in detail below.

After the energized, the user presses desirable button, and the control signal of button will send by keyboard 35.In other words, the switch on the keyboard 35 will be under the state of opening along with the user's beats, and along with opening of keyswitch, signal will be sent to microcontroller 30.

At this moment the control signal that is sent to microcontroller 30 will be input in the port that is provided with in it.Be input to the control signal of microcontroller 30, along with the difference of button on the keyboard of pressing, control signal also is sent in the different ports.Microcontroller 30 just can be discerned different control signals like this, thereby the controlled microwave stove is done various culinary art, heating etc.

In addition, Fig. 1 b is made of following components.The energising back is in order to judge the option part 57 of goods style; Identification signal and controlled microwave stove are carried out the microcontroller 45 of various functions; Be provided with the keyboard 50 of most keyswitches; Show the pattern of the function choosing-item that the user imports or the screen display unit 55 of literal.

Microcontroller 45 possesses ten port P1～P10 is arranged, and screen display unit 55 possesses the first grid port G1 is arranged～the 7th grid port G7.Microcontroller 45 is connected with screen display unit 55 usefulness sweep traces.

Also be provided with the keyboard 50 that is made of 7 * 6 matrix shape, the row end of keyboard 50 is connected with button input port P9, the P10 of microcontroller 45.The row end of keyboard 50 is connected with sweep trace above-mentioned then.Between keyboard 50 and the sweep trace, shown in Fig. 1 b, be provided with transistor Q80～Q96 and diode D80～D86 like that.

From the scanning output waveform of microcontroller 45 output, be sent to the grid port (G1～G7) of screen display unit 55 by the network scanning line.At this moment, the sweep waveform power consumption that transmits by the network scanning line is very big, nor stable.So the phenomenon that keyboard 50 can't operate as normal takes place.Be connected with transistor (Q80～Q96) and diode (D80～D86) for what prevent this bad phenomenon.Signal will be stable like this is sent to keyboard 50.

The user is by keyboard 50 input control signals, along with the user will open by the corresponding keyswitch that the button on the lower keyboard is provided with on keyboard 50.Its result has only the sweep trace of opening just to understand the output scanning waveform.Sweep waveform will be sent to button input port P9, P10 by the sweep trace of opening like this.

Microcontroller 45 just can be discerned the signal of the button that the user presses like this, thereby makes micro-wave oven begin corresponding work.In other words, microcontroller 45 controlled microwave stoves can be seen the icon or the literal of the function that the user is performed from screen display unit 55.

Option port P8 is set in microcontroller 45.Option port P8 is connected with sweep trace.Option port P8 plays supervision is sent to the sweep signal of screen display unit 55 from microcontroller 45 the effect of voltage.The microcontroller 45 that detects scanning voltage signal then just can be held the characteristic of various signals, thus controlled microwave stove operate as normal.

But the keying scan circuit according to prior art has following said problem.

As shown in Figure 1a, a lot of option ports had been utilized in the past.Will be provided with a lot of option ports like this in microcontroller 45, its result just causes the rising of microcontroller 45 prices.And the number of the various parts that use in the option port is also very many, will bring a lot of inconvenience to production.Moreover, used independent port, the pairing port of button also increases thereupon so in the past.The structure of parts is extremely complicated like this.

On the other hand, the scanning output waveform instability of exporting in the grid port that in the existing screen display unit of Fig. 1 b, is provided with.And extremely responsive to the variation of environment, so very irregular output voltage.

Summary of the invention

The problem that place of the present invention solves is that the keying scan circuit stable output key scan output waveform of a kind of energy, that simplify relatively is provided.

The technical solution adopted in the present invention is: a kind of keying scan circuit, include screen display unit, the keyboard of microcontroller, shows signal, wherein, keyboard possesses to be had and the corresponding switch of function button that transmits signal to microcontroller, it is characterized in that, also be provided with by microcontroller reception control shows signal and also will control anodal sweep trace and the network scanning line that shows signal is sent to screen display unit, wherein anodal sweep trace is connected each switch between microcontroller and the screen display unit.

Also be provided with the A/D option current on the anodal sweep trace that is connected between microcontroller and the screen display unit, this A/D option current detects toward the anodal sweep signal of screen display unit output when energising, is sent to microcontroller then.

In screen display unit, also do not export before the pairing figure of certain function of micro-wave oven or literal of user's input, possessed the anodal port that on screen display unit, continues to send the scanning output waveform according to keying scan circuit of the present invention.The signal of exporting from anodal port is till the A/D option current of detection signal like this, and the centre is not provided with transistor and diode, and processing procedure can be oversimplified like this, and the formation of circuit will be simpler simultaneously.And the increase of the anodal port number that possesses in keying scan circuit of the present invention just can enlarge and being connected of keyboard, thereby can guarantee the function key of some.

Description of drawings

Fig. 1 a is the keyboard input circuit of prior art;

Fig. 1 b is the keying scan circuit of prior art;

Fig. 2 is a keying scan circuit of the present invention;

Fig. 3 a is the network scanning output waveform figure of exporting in the microcontroller of the present invention.

Fig. 3 b is the positive pole scanning output waveform figure of exporting in the microcontroller of the present invention.

Fig. 3 c is the output time and the anodal oscillogram that scans the output time of output waveform of network scanning output waveform.

Fig. 4 is the control flow chart of the control procedure of keying scan circuit of the present invention.

Wherein:

20,57: option current 35,50,60: keyboard 30,40,70: microcontroller

55,80: screen display unit A:A/D option current B: signal perception circuit

GL: network scanning line AL: anodal sweep trace

Embodiment

Describe in detail according to keying scan circuit of the present invention below with reference to accompanying drawing.

As shown in Figure 2, comprise the just automatic option current A that detects micro-wave oven of energized on the micro-wave oven according to keying scan circuit of the present invention; The keyboard 60 as input equipment of input user instruction; Come the microcontroller 70 of identification signal according to user's input; Control signal according to microcontroller 70 shows that the icon of the selected function of user or the screen display unit 80 of literal constitute.

The annexation of the keying scan circuit of the present invention that is made of above-mentioned several sections is such:

Be connected with network scanning line GL and anodal sweep trace AL between microcontroller 70 and the screen display unit 80.Network scanning line GL be connected with anodal sweep trace AL separately both sides grid port G1～G7 and both sides positive terminal P1～P7 port separately.

Possessing has the keyboard 60 that is made of 7 * 6 matrix shape, and the first row port of keyboard 60～the 7th row port 01～07 is connected with column scan line a1～a7.The 8th row port～the tenth triplex row port 08～13 of keyboard 60 is connected with horizontal scanning line b1～b6.

Keyboard 60 is connected with microcontroller 70.And microcontroller 70 is provided with two port P21, P22 in order to pass through the capable signal that horizontal scanning line b1～b6 receives keyboard 60.

Further describe above-mentioned two port P21, P22, the 8th row port 08 of keyboard 60 is connected with the 20th resistance R 20.The 9th row port 09 is connected with the 21st resistance R 21.The 21st resistance R 21 is connected between the 9th row port 09 and the 20th resistance R 20.The tenth row port one 0 is connected with the 22nd resistance R 22, and the 22nd resistance R 22 is connected between the tenth row port one 0 and the 21st resistance R 21.

The 20th resistance R 20 is connected with the 21 port P21 on being arranged on microcontroller 70.The 20th resistance R 20 and be arranged between the 21 port 21 on the microcontroller 70 and be connected with the first capacitor C1, the other end ground connection of the first capacitor C1.

The tenth delegation's port one 1 of keyboard 60 is connected with the 23rd resistance R 23.The 12 row port one 2 is connected with the 24th resistance R 24.The 24th resistance R 24 is connected between the 12 row port one 2 and the 23rd resistance R 23.The tenth triplex row port one 3 is connected with the 25th resistance R 25, and the 25th resistance R 25 is connected between the tenth triplex row port one 3 and the 24th resistance R 24.

The 23rd resistance R 23 is connected with the 22 port P22 on being arranged on microcontroller 70.The 23rd resistance R 23 and be arranged between the 22 port 22 on the microcontroller 70 and be connected with the second capacitor C2, the other end ground connection of the second capacitor C2.

Be arranged in the middle of the first row port～the 7th row port 01～07 in the keyboard 60, the first row port 01 is connected with diode D1, diode D1 and 11 series connection of the 11st resistance R.Secondary series port 02 is connected with diode D2, diode D2 and 12 series connection of the 12nd resistance R.The 3rd row port 03 is connected with diode D3, diode D3 and 13 series connection of the 13rd resistance R.The 4th row port 04 is connected with diode D4, diode D4 and 14 series connection of the 14th resistance R.The 5th row port 05 is connected with diode D5, diode D5 and 15 series connection of the 15th resistance R.The 6th row port 06 is connected with diode D6, diode D6 and 16 series connection of the 16th resistance R.At last, the 7th row port 07 is connected with diode D7, diode D7 and 17 series connection of the 17th resistance R.

The 11st resistance R 11 is connected with the first anodal sweep trace AL1 that is connected microcontroller 70 and screen display unit 80, the 12nd resistance R 12 is connected with the second anodal sweep trace AL2, the 13rd resistance R 13 is connected with the 3rd anodal sweep trace AL3, the 14th resistance R 14 is connected with the 4th anodal sweep trace AL4, the 15th resistance R 15 is connected with the 5th anodal sweep trace AL5, the 16th resistance R 16 is connected with the 6th anodal sweep trace AL6, and the 17th resistance R 17 is connected with the 7th anodal sweep trace AL7.

Possess on the microcontroller 70 option port P20 is arranged, option port P20 connects the all-in resistance of most resistance R 1～R6 parallel connections.That is, the 2nd resistance R the 2, the 3rd resistance R the 3, the 4th resistance R the 4, the 5th resistance R the 5, the 6th resistance R 6 is connected in parallel.An above-mentioned majority resistance is connected with diode D8～D12 one to one.That is the 6th resistance R 6 and diode D8 series connection, the 5th resistance R 5 and diode D9 series connection, the 4th resistance R 4 and diode D10 series connection, the 3rd resistance R 3 and diode D11 series connection, the 2nd resistance R 2 and diode D12 series connection.

Diode D8～D12 one to one with the column scan line (a1～a7) be connected that transmits sweep signal.(end of a1～a7) is connected on the row port 01～07 of keyboard 60 the column scan line one to one, and the other end is connected one to one with the anodal sweep trace AL1～AL7 that is connected microcontroller 70 and screen display unit 80.Promptly, diode D12 is connected with the 3rd column scan line a3, and diode D11 is connected with the 4th column scan line a4, and diode D10 is connected with the 5th column scan line a5, diode D9 is connected with the 6th column scan line a6, and diode D8 is connected with the 7th column scan line a7.

A/D option current A detects from the signal of anodal sweep trace output like this, and A/D option current A goes up the difference of the resistance that connects, and the voltage that is sent to option port P21, the P22 of microcontroller 70 will be different.Microcontroller 70 is discerned user's various different instructions according to the difference of the voltage that receives.

As shown in Figure 2, grid port G1～G7 and anodal port P1～P7 output scanning output waveform from microcontroller 70 toward screen display unit 80, just as Fig. 3 a, Fig. 3 b, the such output scanning output waveform shown in Fig. 3 c.That is, Fig. 3 a, such grid port G1～G7 and the anodal port P1～P7 with the past screen display unit 80 of certain frequency shown in Fig. 3 b sends sweep signal.Thereby receive the screen display unit 80 of signal, show corresponding figure or literal according to the scanning output signal.

At first observe the network scanning output waveform that transmits toward the grid port of Fig. 3 a, the scanning output waveform is exported in the cycle at t1 and is opened signal.The scanning output signal of output one by one be sent to each port among grid port G1～G7.Be input to the scanning output control signal of the first grid port G1, through the s1 time, finish the t1 cycle and close after starting work, meanwhile, the second grid port G2 will receive the scanning output control signal in t1 cycle, thereby beginning to do starts work.

As described above, the network scanning output waveform of output order is sent to the first grid port G1 to the, seven grid port G7.The sweep waveform output procedure in this cycle is finished, and meanwhile the output cycle is the anodal sweep waveform of t1 from the first anodal port P1 of microcontroller 70.As described above, the output of the first grid port G1 to the, seven grid port G7 is retouched the process of output waveform and can be carried out repeatedly, and when process was carried out repeatedly, each anodal port (produced the scanning output waveform among the G1～G7).

Below, with reference to control procedure and Fig. 3 a of figure 2, Fig. 3 b, the control procedure of the scanning output waveform explanation keying scan circuit of Fig. 3 c.

After the micro-wave oven energising, in proper order transmission sweep waveform among the grid port G1～G7 of the screen display unit 80 that comprises in the control structure of sweep circuit.As shown in the figure, finish, then as shown in the figure, from the first anodal port P1, transmit sweep waveform from the transmission of the network scanning waveform of the first grid port G1 to the, seven grid port G7.

That is, shown in Fig. 3 c like that, toward the seven grid port G7 transmission cycles of the first grid port G1 to the be the sweep waveform of t1.At this moment, the first grid port G1 wait for s1 after the time output cycle be the sweep waveform of t1, the second grid port G2 wait for s2 after the time output cycle be the sweep waveform of t1.Like this grid port G1～G7 wait for separately behind fixed time S1～S7 the output cycle be the sweep waveform of t1.Its result just can doing of order start work.The output of network scanning waveform finishes, and the output cycle is the scanning output waveform of t1 in the first anodal port P1.

The scanning output waveform of exporting from the first anodal port P1 is identical with the output control procedure of above sweep waveform.From separately anodal port P2～P7 output waveform process output procedure as grid port G1～G7.

Therefore, the A/D option current A that possesses in the sweep circuit of energising back will be by the output voltage of option line OL perception from the sweep waveform of anodal sweep trace AL output.Like this by the just exercises of energy controlled microwave stove of option line OL.The reason that option line OL is set is in order to come the various functions of controlled microwave stove with a microcontroller 70.

As mentioned above, sweep signal is sent to diode D12 from possessing in the diode D8 of A/D option current A, in the 2nd resistance R 2, the voltage signal that distributes according to the 6th resistance R 6 will transmit by an option port P20 in the microcontroller 70, after microcontroller receives above-mentioned signal, will come the action of controlled microwave stove according to voltage of signals.

The user is by the function of the desirable micro-wave oven of keyboard 60 selections, and the signal of the selected function of user will be sent to microcontroller 70.As shown in Figure 2, in keyboard 60, possesses the switch that various function button correspondences are arranged.The user selects one of them button, signal will be sent to microcontroller 70 A/D button input port 1,2 (P21, P22).

For example, select puffed rice (POP CORN) option in the function key of keyboard 60, the pairing switch of puffed rice button will be connected, and the signal of No. five line outputs of anodal sweep trace AL will be sent to the 5th column scan line a5, connects the 5th row port 05 of keyboard.Toward with the tenth horizontal scanning line b3 that the 5th column scan line a5 is connected in transmit signal, signal will be ultimately delivered to signal perception circuit B like this.And, be input to the signal perception port 21 of microcontroller 70 by distribution at the resistance R 20～R22 that is connected with signal perception circuit B.

Therefore the microcontroller 70 that receives signal will be discerned the operation that the user imports, thereby makes a certain function operation of the pairing micro-wave oven of operation.Meanwhile No. five lines by anodal sweep trace AL above-mentioned transmit signals, make the pairing figure of execution function or the literal of in screen display unit 80 microwave oven.

The control procedure of the keying scan circuit of above-mentioned such output scanning waveform is such:

As shown in Figure 4, energized on micro-wave oven (100 stage) by the grid port G1～G7 output scanning waveform of microcontroller 70, and then is sent to the grid port G1～G7 of screen display unit 80.As shown in Figure 3, behind the first grid port G1 to the, seven grid port G7 output scanning waveforms, only then since first anodal port P1 output scanning output waveform in proper order.From the network scanning waveform process of the first grid port G1 to the, seven grid port G7, on first anodal port P1 to the seven anodal port P7 (the 110th stage) repeatedly.

At this moment, A/D option current A shown in Figure 2 reads the voltage (the 120th stage) of retouching output waveform.Identify the voltage (the 130th stage) of retouching output waveform then, just carry out corresponding instruction, make microwaves corresponding stove function on.

When retouching output waveform output, the user imports desirable function (the 140th stage) by keyboard.The control signal that produces by a certain button of lower keyboard will be sent to anodal sweep trace as shown in Figure 2 like this.Be sent to the control signal of the corresponding button of anodal sweep trace,, be sent to the 1st, 2 signal perception port P21, the P22 of microcontroller 70 again along with the work that starts on the keyboard 60 to inductive switch.Then, according to the control signal that transmits, microcontroller 70 will the controlled microwave stove be done the action corresponding to control signal.And microcontroller 70 control screen display units 80 make figure or the literal (150 stage) that screen display unit 80 shows corresponding to the micro-wave oven function.

According to keying scan circuit of the present invention, though with reference to the micro-wave oven explanation, but be applicable to that other comprise the household appliances of screen protective device.

Claims

1. keying scan circuit, include microcontroller (70), the screen display unit of shows signal (80), keyboard (60), wherein, keyboard (60) possesses to be had and the corresponding switch of function button that transmits signal to microcontroller (70), it is characterized in that, also be provided with by microcontroller (70) reception control shows signal and also will control anodal sweep trace (AL) and the network scanning line (GL) that shows signal is sent to screen display unit (80), wherein anodal sweep trace (AL) is connected each switch between microcontroller (70) and the screen display unit (80).

2。Keying scan circuit according to claim 1, it is characterized in that, also be provided with the A/D option current (A) on the anodal sweep trace (AL) that is connected between microcontroller (70) and the screen display unit (80), this A/D option current (A) detects toward the anodal sweep signal of screen display unit (80) output when energising, is sent to microcontroller (70) then.