CN201622325U - Keypad testing device and television testing system - Google Patents

As shown in Figure 1, in the prior art, usually be provided with a plurality of

2 on the

1, each

2 all links to each other with

10 on the

1, after

2 is pressed, each

2 that is pressed all can make

10 conductings, and the signal output part Aout that passes through

10 on the

1 exports the correspondent voltage signal, the signal output part Aout of

10 links to each other with the master chip 30 of televisor, if the voltage of this voltage signal is in the

2 pairing effective ranges that are pressed, the master chip 30 of televisor just can be according to the

2 defined functions that are pressed, the various operations that pressing

2 will realize are finished in control and corresponding various functional modules 40 of

2 defined functions or function element.

Because the cost of the master chip 30 of televisor and last and corresponding various functional modules 40 of

2 defined functions or function element is quite high usually, and the interlock circuit on the master chip 30 peripheral circuits plates of televisor is very complicated, the attended operation of

1 with the master chip 30 of televisor not only bothered, and not quick detachable, so common detection to

1 is by the lower key testing device of cost in the prior art.

As shown in Figure 2, when using existing key testing device to test

1, key circuit on the

1 10 is linked to each other with existing key testing device, when the button on the

12 was pressed, whether the key testing device just can be measured the

2 that is pressed can make

10 conductings.

Existing key testing device, when only can the

2 on

1 as shown in Figure 2 being pressed, measure the

2 that is pressed and whether can make

10 conductings, but can't detect which

2 on the

1 when being pressed, the voltage of the voltage signal of the signal output part Aout output of

10 is not or not in the effective range, because effective range and this

2 defined functions of the magnitude of voltage of each

2 pairing voltage signal are corresponding, if the magnitude of voltage of voltage signal is provided with inaccurate, nor can detect and correct,

2 parafunctional problems appear in the

1 that can cause producing easily.

As shown in Figure 3 and Figure 4, the key testing device that the utility model embodiment is provided comprises at least one

3 that links to each other with the

1 that is provided with at least one

2 and the indicating

4 that links to each other with

3, wherein:

When the

2 on the

1 was pressed, each

2 that is pressed all can be by the signal output part Aout output correspondent voltage signal of the

10 on the

1;

3 links to each other with the signal output part Aout of

10, is used to receive voltage signal, and whether the magnitude of voltage of judging voltage signal in the

2 pairing effective scopes that are pressed, and judged result is imported indicating

4;

4 is used to indicate judged result.

Because when

3 can receive

2 and is pressed in the key testing device that provided of the utility model embodiment, the

2 that is pressed is by the voltage signal of the signal output part Aout output of

10, and whether the magnitude of voltage of judging voltage signal is in the

2 pairing effective scopes that are pressed, and judged result imported indicating

4, and indicating

4 can be indicated judged result, and then can realize the complete detection to keypress function;

Compare with existing key testing device, the key testing device that present embodiment provided can detect when which

2 is pressed on the

1, the voltage of the voltage signal of the signal output part Aout output of

10 is not or not in the effective range, thereby can in time find in-problem

2, and can be in time to in-

2 places under repair, correct, and then when guaranteeing that each

2 is pressed, the voltage signal of its signal output part Aout output by

10 is all in the

2 pairing effective scopes that are pressed, avoided voltage signal to surmount effective scope and caused parafunction, occurred

2 parafunctional technical matterss easily so solved the

1 that existing key testing device can cause producing;

Simultaneously, because usually

3 is than low many of the cost of the master chip of televisor, indicating

4 with indication judged result effect also can select much to realize than corresponding various functional modules of

2 defined functions or function element is simple in structure and cost is also low electron device, so use key testing device that present embodiment provided can also reduce the cost of

2 test macros.

As shown in Figure 4,

3 comprises at least one judging unit L in the present embodiment, be equipped with the highest effective voltage input end Vh, minimum effective voltage input end V1, voltage signal input end Uin, electric energy input end Vin, output terminal out1, out2 and earth terminal GND as a result on each judging unit L, wherein:

The highest effective voltage input end Vh links to each other with power module Vcc, is used for obtaining from power module Vcc the highest effective voltage of the

2 that is pressed, and the highest effective voltage is imported judging unit L;

Minimum effective voltage input end V1 links to each other with power module Vcc, is used for obtaining from power module Vcc the minimum effective voltage of the

2 that is pressed, and with minimum effective voltage input judging unit L;

Voltage signal input end Uin links to each other with the signal output part Aout of

10, is used to receive voltage signal, and voltage signal is imported judging unit L;

The magnitude of voltage that judging unit L is used to judge each voltage signal whether between

2 the highest pairing effective voltages that are pressed and minimum effective voltage, and with judged result by the indicating

4 of output terminal out1, out2 input as a result;

3 can only comprise a judging unit L in the present embodiment, also can comprise two and even more a plurality of judging unit L.

When an

3 comprises as shown in Figure 4 two judging unit L,

3 can judge two

2 be pressed after the voltage signal exported respectively of the signal output part Aout of

10 whether in each

2 pairing effective range.

During to the

1 of the highest effective voltage input end Vh input of one of them judging unit L in the

3 that comprises two judging unit L (being labeled as 2L among the figure) as shown in Figure 4, minimum effective voltage input end V1 input voltage U2, after this judging unit L can judge that a

2 is pressed, whether the magnitude of voltage of the voltage signal of the signal output part Aout of

10 output was between U1 and U2;

The highest effective voltage input end Vh of another judging unit L among two judging unit L of

2 inputs, simultaneously, when the minimum effective voltage input end V1 input voltage U3 of this judging unit L, after this judging unit L can judge that another

2 is pressed, whether the magnitude of voltage of the voltage signal of the signal output part Aout of

10 output was between U2 and U3.

Therefore, the number of the

2 that can detect as required in the present embodiment, the number of judging unit L in the number of

3 and the

3 in selection the utility model embodiment key testing device.

As shown in Figure 5, when an

3 comprises two judging unit L (being labeled as 2L among the figure),, then need 4

3 just can finish detection at least if the

2 that needs to detect is 7.At this moment, the effective range of the key testing device voltage signal that can detect has 7 respectively.

As shown in Figure 8, in the present embodiment power module Vcc comprise plug, stabilivolt N1, supply voltage output end vo ut,

1,

2,

3,

4, the

5 that links to each other with plug and the bleeder circuit as shown in Figure 6 that links to each other with supply voltage output end vo ut, wherein:

Electric energy input end Vin links to each other with supply voltage output end vo ut, and the highest effective voltage input end Vh and minimum effective voltage input end V1 link to each other with the voltage output end of

1, U2, U3, U4, U5, U6, U7 on the bleeder circuit respectively;

Stabilivolt N1 as shown in Figure 8 comprises two input pin Vin1, Vin2 and two output pin Vout1, Vout2, and a wherein utmost point of

1 and

2 is connected between input pin Vin1 and the plug, wherein another utmost point ground connection;

A wherein utmost point of

3 is connected on the input pin Vin2, wherein another utmost point ground connection;

A wherein utmost point of

4 and

5 links to each other with output pin Vout1, Vout2 and supply voltage output end vo ut respectively, wherein another utmost point ground connection.

Stabilivolt N1 and

1,

2,

3,

4,

5 can be converted into the electric energy from the plug input a more stable voltage, and (for example: 3.3V) export from supply voltage output end vo ut the back, thereby guarantee the accuracy that the key testing device detects.Certainly, can also use other mu balanced circuits to replace stabilivolt N1 and coupled a plurality of electric capacity in the present embodiment.

1, U2, U3, U4, U5, U6 and U7, obtain by 7 pairs of electric resistance partial pressures in parallel in the bleeder circuit respectively, for example:

1 by resistance R 01 and R02 dividing potential drop obtain,

2 by

3 and R4 dividing potential drop obtain,

3 obtains by

5 and R6 dividing potential drop.Certainly, power module Vcc also can directly export the different electric energy of plurality of voltages value.

The voltage that power module Vcc is exported all when the function of

2, is just predesignated.Certainly, the electric energy input end Vin of a plurality of

3 can a shared power module Vcc in the present embodiment, also can be respectively links to each other with different power module Vcc.

When the magnitude of voltage of voltage signal, in the time of in the

2 pairing effective scopes that are pressed, judged result is high level or low level;

When the magnitude of voltage of voltage signal, in the time of not in the

2 pairing effective scopes that are pressed, judged result is low level or high level.

Be difficult for loss in the signals transmission of high-low level form, and it is a lot of to discern the electron device of indicating

4 of signal of high-low level form, the wide range of selecting for use helps to reduce the cost of present embodiment key testing device.

When the magnitude of voltage of voltage signal, in the time of not in the

2 pairing effective scopes that are pressed, judged result is a low level in the present embodiment, otherwise then judged result is a high level.

Indicating

4 is luminescent device and/or microphone device in the present embodiment, each as a result output terminal out1, out2 link to each other with an indicating

4, indicating

4 is indicated judged result by the mode of luminous or jingle bell.

No matter be luminous or the mode of jingle bell all can be indicated tester's judged result, be preferably in the present embodiment and adopt luminous mode that because luminous mode can not produce noise pollution, and a plurality of different indicating

4 also is convenient to differentiate when simultaneously luminous.

Indicating

4 is light emitting diode VD as shown in Figure 4 and Figure 5.Light emitting diode VD is a kind of luminous electron device with low cost, and power consumption is very low, helps to reduce the cost of the utility model key testing device.

As shown in Figure 4 and Figure 5,

3 also is connected with and draws power supply Vs in the present embodiment, output terminal out1, out2 comprise two output pin Out1, Out2 as a result as a result, indicating

4 with one of them as a result output pin Out2 link to each other, on draw power supply Vs output pin Out1, Out2 link to each other as a result with two by

1.

On draw the main effect of power supply Vs to be: when the output of output terminal out1, out2 as a result high level, be indicating

4 power supplies, thereby drive indicating

4 work.When output terminal out1, out2 output low level as a result, on draw the electric current that flows through

1 of power supply Vs very little, the electric energy of

4 also seldom is not enough to drive indicating

4 work.

3 is a voltage comparator.Voltage comparator can carry out voltage ratio more accurately, thus judge accurately judge each voltage signal magnitude of voltage whether between

2 the highest pairing effective voltages that are pressed and minimum effective voltage.Certainly,

3 can also adopt outside the voltage comparator other to have the electron device of voltage comparing function in the present embodiment.

3 is a double-limit comparator.Double-limit comparator stable performance, and be provided with two judging unit L in the common double-limit comparator is so

3 can be used to test the

2 of two difference in functionalitys simultaneously.

As shown in Figure 7, also be connected with the signal power source circuit on the voltage signal input end Uin in the present embodiment, wherein: the signal power source circuit comprises signal power source Vcd, capacitor C and divider resistance Rcd, one end of capacitor C links to each other with signal power source Vcd, the other end of capacitor C and ground connection after the earth terminal GND of

10 is in parallel;

Divider resistance Rcd one end links to each other with signal power source Vcd, and the other end of divider resistance Rcd is connected between the signal output part Aout of voltage signal input end Uin and

10.

When testing the

2 on the

1,

10 is linked to each other with voltage signal input end Ui n and signal power source circuit respectively, after

2 is pressed, feasible

10 conductings as shown in Figure 3 of

2 meetings, because

2 can insert the signal power source circuit with the resistance of different resistances, the resistance of different resistances is understood with divider resistance Rcd dividing potential drop after inserting the signal power source circuit, and then produces the voltage signal with magnitude of voltage.

The tv test system that present embodiment provided comprises being provided with at least one

1 of

2 and key testing device that above-mentioned the utility model embodiment is provided as shown in Figure 3.

1. key testing device is characterized in that: comprise at least one amplifier chip that links to each other with the keypad that is provided with at least one button and the indicating module that links to each other with described amplifier chip, wherein:

When the described button on the described keypad was pressed, the described button of each that is pressed all can be by the signal output part output correspondent voltage signal of the key circuit on the described keypad;

Described amplifier chip links to each other with the signal output part of described key circuit, be used to receive described voltage signal, and whether the magnitude of voltage of judging described voltage signal in the pairing effective scope of the described button that is pressed, and judged result is imported described indicating module;

Described indicating module is used to indicate described judged result.

2. key testing device according to claim 1, it is characterized in that: described amplifier chip comprises at least one judging unit, be equipped with the highest effective voltage input end, minimum effective voltage input end, voltage signal input end, electric energy input end, output terminal and earth terminal as a result on each described judging unit, wherein:

The highest described effective voltage input end links to each other with power module, is used for obtaining from described power module the highest effective voltage of the described button that is pressed, and the highest described effective voltage is imported described judging unit;

Described minimum effective voltage input end links to each other with power module, is used for obtaining from described power module the minimum effective voltage of the described button that is pressed, and described minimum effective voltage is imported described judging unit;

Described voltage signal input end links to each other with the signal output part of described key circuit, is used to receive described voltage signal, and described voltage signal is imported described judging unit;

Described electric energy input end links to each other with power module, is used for obtaining the required electric energy of described judging unit from described power module;

The magnitude of voltage that described judging unit is used to judge each described voltage signal and is imported described indicating module with judged result by described output terminal as a result whether between pairing the highest described effective voltage of the described button that is pressed and described minimum effective voltage;

Described earth terminal ground connection.

3. key testing device according to claim 2 is characterized in that: the described judged result that described output terminal is as a result exported is the high-low level form;

When the magnitude of voltage of described voltage signal, in the time of in the pairing effective scope of the described button that is pressed, described judged result is high level or low level;

When the magnitude of voltage of described voltage signal, in the time of not in the pairing effective scope of the described button that is pressed, described judged result is low level or high level.

4. key testing device according to claim 3, it is characterized in that: described indicating module is luminescent device and/or microphone device, each described output terminal as a result links to each other with a described indicating module, and described indicating module is indicated described judged result by the mode of luminous or jingle bell.

5. key testing device according to claim 4 is characterized in that: described indicating module is a light emitting diode.

6. key testing device according to claim 5, it is characterized in that: described amplifier chip also is connected with and draws power supply, described output terminal as a result comprises two output pins as a result, described indicating module links to each other with one of them described output pin as a result, draws power supply to pass through first resistance on described and links to each other with two described output pins as a result.

7. key testing device according to claim 3 is characterized in that: described amplifier chip is a voltage comparator.

8. key testing device according to claim 7 is characterized in that: described amplifier chip is a double-limit comparator.

9. key testing device according to claim 3 is characterized in that: also be connected with the signal power source circuit on the described voltage signal input end, wherein:

Described signal power source circuit comprises signal power source, electric capacity and divider resistance, and a utmost point of described electric capacity links to each other with described signal power source, another utmost point of described electric capacity and ground connection after the earth terminal of described key circuit is in parallel;

Described divider resistance one end links to each other with described signal power source, and the other end of described divider resistance is connected between the signal output part of described voltage signal input end and described key circuit.

10. a tv test system is characterized in that: comprise that the keypad and the aforesaid right that are provided with at least one button require 1 to 9 arbitrary described key testing device.