CN1704657A - Power supply circuit for touch sensor - Google Patents
Power supply circuit for touch sensor Download PDFInfo
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- CN1704657A CN1704657A CN 200410019390 CN200410019390A CN1704657A CN 1704657 A CN1704657 A CN 1704657A CN 200410019390 CN200410019390 CN 200410019390 CN 200410019390 A CN200410019390 A CN 200410019390A CN 1704657 A CN1704657 A CN 1704657A
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- microprocessor
- touch sensor
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Abstract
This invention relates to a power circuit of a contact sensor, which comprises a micro processor, wherein the micro processor comprises display part, contact sensor, inverse voltage preventing part and power supply part; the micro processor output display controlling signal which displaying driving impulse and key scanning impulse, and the display part connects to the display special port of the micro processor; according to the display controlling signal and grid scanning impulse action, the contact sensor connects with part ports of the special display port; according to the key input signal emitted by the key scanning impulse, the inverse voltage prevent part will connects with output of the micro processor, preventing the inverse voltage of the contact sensor; the output of the micro processor connects to the contact sensor, and the power supply part connects to the output of the inverse voltage prevent part, applying some voltage to the sensor according to the output key scanning impulse.
Description
Technical field
The present invention relates to micro-wave oven, relate in particular to the power circuit field of the touch sensor in the common circuit of the display part of micro-wave oven and touch sensor.
Background technology
The micro-wave oven of prior art is the electrical equipment for use in kitchen that the microwave that mainly utilizes magnetron to produce takes the indoor food of cooking.The microprocessor of micro-wave oven is made of 44 to 64 input/output ports usually.But, be connected in the existing special-purpose output port of microprocessor of display element and connecting touch panel on the part port because of microprocessor port deficiency.
As shown in Figure 1, as main heating source, the common circuit of its display part and touch sensor is made of display part 2, touch sensor 3, microprocessor 1 micro-wave oven the microwave that produces on the magnetron.After part port P50 to P56 among display part 2 private port P50 to P57, P70 to P77, P80 to P87, the P30 to P31 connected touch sensor 3, the key scan pulse of touch sensor 3 outputs had just been exported by microprocessor 1.
Display part with the action of the common circuit of touch sensor is: the input port G1 to G10, the P1 to P16 that at first are connected display part 2 at display part 2 special-purpose output port P50 to P57, P70 to P77, P80 to P87, the P30 to P31 of microprocessor 1.As shown in Figure 2, part port P50 to P56 prevents portion 4 by back voltage in the special-purpose output port of the display part of the microprocessor 1 of connection display part 2, connects touch sensor 3.Back voltage prevents that portion 4 from being made of several diodes, and the positive pole of diode is connected on the output port P50 to P56 of microprocessor 1.Back voltage prevents that portion 4 from can prevent to produce back voltage from touch sensor 3 to microprocessor 1.And when the part port P50 to P56 in the special-purpose output port of the display part of microprocessor 1 is connected touch sensor 3, in order to improve the key input sensitivity of touch sensor 3, the mode of twice above key scan pulse is exported in employing in the one-period of microprocessor 1 magnetron, one-period comprises the interval and non-oscillatory interval of vibration.This moment, touch sensor 3 needed 4.5 volts to 5.5 volts voltage for the key input sensitivity, and the key scan pulse of normal microprocessor 1 output should be 5 volts.
But in existing display part and the touch sensor common circuit, though the key scan pulse of microprocessor 1 output is 5 volts, but because used descended 0.7 volt voltage of the diode that prevents back voltage, diode inside, so touch sensor 3 can not obtain 5 volts of voltages.In display part and the touch sensor common circuit, can not provide 5 volts voltage to touch sensor, touch sensor just can not use as key input apparatus.
Summary of the invention
Technical problem to be solved by this invention is, a kind of power circuit of touch sensor is provided, and in display part and touch sensor common circuit, in order to improve the key input sensitivity of touch sensor, provides suitable voltage to touch sensor.
For the technical solution problem, the technical solution used in the present invention is:
A kind of power circuit of touch sensor is provided, comprise microprocessor 10, microprocessor 10 comprises display part 20, touch sensor 30, back voltage prevents portion 40 and power supply, microprocessor 10 output display control signals, display driver pulse and key scan pulse, display part 20 is connected on the demonstration private port of microprocessor 10, and display control signal and gated sweep pulse action according to microprocessor 10 outputs, touch sensor 30 is connected the part port in the demonstration private port of microprocessor 10, key scan pulse according to microprocessor 10 outputs is exported outside key input signal to microprocessor, back voltage prevents that portion 40 is connected the output of microprocessor port, be used to prevent the back voltage of touch sensor, the output of microprocessor port is connecting touch sensor, power supply is connected the output that back voltage prevents portion 40, and the key scan pulse according to microprocessor output applies certain voltage to touch sensor.
The invention has the beneficial effects as follows:
The power circuit of touch sensor of the present invention, in the display part private port of the microprocessor of micro-wave oven on the part port, connecting touch sensor, in this display part and touch sensor common circuit, in order to improve the key input sensitivity of touch sensor, provide suitable voltage to touch sensor.
Description of drawings
Fig. 1 is the circuit diagram of the touch sensor power circuit of prior art.
Fig. 2 is the circuit diagram of A part in the enlarged drawing 1.
Fig. 3 is the circuit diagram of touch sensor power circuit of the present invention.
Wherein:
10: microprocessor 20: display part
30: touch sensor 31: power supply
40: back voltage prevents portion
The specific embodiment
Be described in further detail below in conjunction with the power circuit of the drawings and specific embodiments touch sensor of the present invention:
As shown in Figure 3, the power circuit of the touch sensor of display part of the present invention and touch sensor common circuit, comprise microprocessor 10, display part 20, touch sensor 30, back voltage prevents portion 40 and power supply 31, microprocessor 10 output display control signals, display driver pulse and key scan pulse, display part 20 is connected the demonstration private port P50 to P57 of microprocessor 10, P70 to P77, P80 to P87, on the P30 to P31, and display control signal and gated sweep pulse action according to microprocessor 10 outputs, touch sensor 30 is connected the demonstration private port P50 to P57 of microprocessor 10, P70 to P77, P80 to P87, part port P50 to P56 among the P30 to P31, key scan pulse according to microprocessor 10 outputs is exported outside key input signal to microprocessor 10, back voltage prevents that portion 40 is connected the output of microprocessor 10 port P50 to P56, be used to prevent the back voltage of touch sensor 30, power supply 31 is connecting the output that back voltage prevents portion 40, and the key scan pulse according to microprocessor output applies certain voltage to touch sensor 30.Back voltage prevents that portion 40 from being made of several diodes D90 to D96, and the positive pole of diode D90 to D96 is connected on the microprocessor port P50 to P56.Power supply 31 is made of several the first transistors Q80 to Q86 and several transistor secondses Q90 to Q96 in addition.The base stage of the first transistor Q80 to Q86 is connecting the positive pole of diode D90 to D96 respectively, emitter stage connects-5 volts of outside power supplys, the base stage of transistor seconds Q90 to Q96 connects the colelctor electrode of the first transistor Q80 to Q86 respectively, and emitter stage has connected ground terminal.Several the first transistors Q80 to Q86 is a NPN transistor, and several transistor secondses Q90 to Q96 is a PNP transistor.
The course of action of the power circuit of touch sensor is: at first, connect display part 20 by the special-purpose output port P50 to P57 of the display part of microprocessor 10, P70 to P77, P80 to P87, P30 to P31.At this moment, the input port P1 to P16 of display part 20 shows related text or character for the control by microprocessor 10, receives display control signal from microprocessor 10, and the input port P1 to P16 of display part 20 is connecting microprocessor 10.When input port G1 to G10 closes at microprocessor 10, receive grid voltage that scanning impulse is decided from microprocessor 10.And, behind the part port P50 to P56 that touch sensor 30 connects among display part 20 special-purpose output port P50 to P57, P70 to P77, P80 to P87, the P30 to P31, receive the key scan pulse of microprocessor 10 outputs.The key scan pulse of microprocessor 10 outputs in the present invention prevents that through back voltage portion 40 is input to the drive source that voltage provides portion 31.Have other key scan pulse of 5 volts of levels, the process back voltage prevents the diode D90 to D96 of portion 40, is output as 4.3 volts voltage then, and continues to be input to the base stage that voltage provides the first transistor Q80 to Q86 of portion 31.By the input of key scan pulse, start the first transistor Q80 to Q86 and transistor seconds Q90 to Q96 successively.
The power circuit of the invention described above touch sensor, this professional those of ordinary skill are appreciated that in the claim scope of determining in not exceeding right request scope of the present invention, can make various displacements.
Claims (4)
1, a kind of power circuit of touch sensor, it is characterized by: comprise microprocessor (10) in the power circuit of described touch sensor, microprocessor (10) comprises display part (20), touch sensor (30), back voltage prevents portion (40) and power supply (31), microprocessor (10) output display control signal, display driver pulse and key scan pulse, display part (20) is connected on the demonstration private port of microprocessor (10), and display control signal and gated sweep pulse action according to microprocessor (10) output, touch sensor (30) is connected the part port in the demonstration private port of microprocessor (10), key scan pulse according to microprocessor (10) output is exported outside key input signal to microprocessor (10), back voltage prevents that portion (40) is connected the output of microprocessor port, be used to prevent the back voltage of touch sensor (30), the output of microprocessor (10) port is connecting touch sensor (30), power supply (31) is connected the output that back voltage prevents portion (40), and the key scan pulse according to microprocessor (10) output applies certain voltage to touch sensor (30).
2, the power circuit of touch sensor according to claim 1, it is characterized in that: described back voltage prevents that portion (40) from being made of several diodes (D90 to D96), and the positive pole of diode (D90 to D96) is connected on each microprocessor port of touch sensor (30).
3, the power circuit of touch sensor according to claim 2, it is characterized in that: power supply (31) is made of several the first transistors (Q80 to Q86) and several transistor secondses (Q90 to Q96), the base stage of the first transistor (Q80 to Q86) is connecting the positive pole of diode (D90 to D96) respectively, emitter stage is connecting-5 volts of outside power supplys, the base stage of transistor seconds (Q90 to Q96) is connecting the colelctor electrode of the first transistor (Q80 to Q86) respectively, and emitter stage is connecting ground terminal.
4, the power circuit of touch sensor according to claim 3 is characterized in that: described several the first transistors (Q80 to Q86) are NPN transistor, and described several transistor secondses (Q90 to Q96) are PNP transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410019390 CN1704657A (en) | 2004-05-27 | 2004-05-27 | Power supply circuit for touch sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410019390 CN1704657A (en) | 2004-05-27 | 2004-05-27 | Power supply circuit for touch sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1704657A true CN1704657A (en) | 2005-12-07 |
Family
ID=35576771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410019390 Pending CN1704657A (en) | 2004-05-27 | 2004-05-27 | Power supply circuit for touch sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1704657A (en) |
-
2004
- 2004-05-27 CN CN 200410019390 patent/CN1704657A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |