CN2781629Y - Control circuit of indicator light in charger - Google Patents
Control circuit of indicator light in charger Download PDFInfo
- Publication number
- CN2781629Y CN2781629Y CN 200520040143 CN200520040143U CN2781629Y CN 2781629 Y CN2781629 Y CN 2781629Y CN 200520040143 CN200520040143 CN 200520040143 CN 200520040143 U CN200520040143 U CN 200520040143U CN 2781629 Y CN2781629 Y CN 2781629Y
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- indicator light
- pin
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- integrated circuit
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Abstract
The utility model discloses a control circuit of an indicator light in a charging seat. The circuit comprises an integrated circuit which is provided with an output connected pin, a state connected pin and an error connected pin, wherein the output connected pin is connected with a rechargeable battery waiting for being charged, the state connected pin and the error connected pin can output different electric potentials, and the state connected pin and the error connected pin are respectively connected with negative poles of a first and a second diodes which are contained in a connection circuit. Positive poles of the first and the second diodes are connected with a grid of a transistor which is contained in the connection circuit, a source of the transistor is grounded, a drain of the transistor is coupled with a first indicator light, and a second indicator light is connected with the state connected pin of the integrated circuit simultaneously. The integrated circuit, the connection circuit and the first and the second indicator lights are all coupled with a power supply. When the utility model is used, the integrated circuit controls whether the first and the second indicator lights are switched on through the connection circuit according to the different electric potentials of the state connected pin and the error connected pin. Consequently, the utility model knows the operating state of the charging seat. The utility model has the advantages of simple circuit, low cost and favorable use value.
Description
Technical field
The utility model relates to a kind of control circuit of indicator light of cradle of portable electron device.
Background technology
Along with development of science and technology, mobile phone or PDA (Personal Digital Assist, personal digital assistant) etc. use more and more widely, because this class of electronic devices is short and small light, has portable function, therefore be provided with rechargeable battery in this class of electronic devices, when power shortage, can give the charging of the rechargeable battery in the equipment by the cradle that matches.
Generally speaking, cradle is provided with the indicator light of indication cradle operating state, and this indicator light comprises red led and green indicating lamp, represents when red led is bright that cradle charges to rechargeable battery; Represent when green indicating lamp is bright that rechargeable battery in the cradle has charged and finish; And when red indicator light and green indicating lamp did not all work, the expression cradle was in abnormal operating state, did not have target or cradle itself such as cradle and broke down etc.
And existing cradle generally is by being microprocessor, logic lock circuit or special-purpose integrated circuit are controlled the conducting state of indicator light, this class control circuit is because the cooperation microprocessor is finished the working condition that detects cradle and the peripheral logic lock circuit of controlling led status is very complicated, the electronic building brick of its formation is more, thereby the The whole control circuit cost is than higher, and this logic gates can make that the The whole control circuit is complicated and increase integrated manufacturing cost, and if the circuit of controlling that adopts application-specific integrated circuit (ASIC) few and price is relatively costly owing to the integrated circuit quantity that can Gong select for use at present has a significant limitation.
So, be necessary to adopt a kind of new control circuit to control the working condition of the conducting of indicator light/not conducting indication cradle, and this control circuit need save cost, and realize simply, can be widely used in the various cradles.
Summary of the invention
The purpose of this utility model is to provide a kind of control circuit of indicator light of cradle.
To achieve these goals, the control circuit of the indicator light of cradle of the present utility model comprises: an integrated circuit, and it has an output connecting pin, is connected with battery to be charged, and a state pin, a wrong pin with output different potentials; One connecting circuit couples mutually with described integrated circuit; And first, second indicator light, couple mutually with above-mentioned connecting circuit; Said integrated circuit, connecting circuit and first, second indicator light all with supply coupling, and integrated circuit is according to the different potentials of state pin, mistake pin, and whether control first, second indicator light of conducting, thereby understand the operating state of this cradle by connecting circuit.
And described connecting circuit comprises: first, second diode, its negative pole electrically connect with the state pin of described integrated circuit, mistake pin respectively; One transistor, the positive pole of its grid and first, second diode all electrically connects, and its source ground, and its drain electrode couples mutually with first indicator light; Above-mentioned transistorized grid is connected with power supply after being connected in series first, second resistance respectively with drain electrode.
Described first, second indicator light is a light-emitting diode, and sends the color difference of light during its both conductings.
Owing to adopted above-mentioned control circuit, state pin when the utility model has made full use of integrated circuit different operating state is different with the current potential of wrong pin, be used as the controlling signal of connecting circuit, conducting/not the conducting of the indicator light of control cradle, the circuit structure of this connecting circuit is simple, therefore cost is low, can be extensive use of.
Description of drawings
Fig. 1 is the control circuit block schematic diagram of the utility model cradle indicator light;
Fig. 2 is the form schematic diagram of the utility model control circuit institute corresponding working state.
Embodiment
Be illustrated in figure 1 as the control circuit block schematic diagram of the utility model cradle indicator light.In cradle, have first, second indicator light 410 and 420 of indication cradle operating state, and show different colours this first, second indicator light 410 and 420 work the time, with the different operating state of expression cradle; And first, second indicator light 410 and 420 is via after the coupling of connecting circuit 10, be connected with integrated circuit 20, the unlike signal that is produced by integrated circuit 20 correspondence when the different operating state comes the whether conducting of branch road between control connection circuit 10 and first, second indicator light 410 and 420, shows the operating state of cradle.
Wherein, integrated circuit 20 is one to detect and the integrated circuit of control cradle operating state in the cradle, and this integrated circuit 20 has power supply input pin 203, and this input pin 203 also is connected with a power supply; And this integrated circuit 20 is provided with an output connecting pin 204 in addition, and these output connecting pin 204 exportable certain voltage/currents are given connected battery 30 to be charged; In addition, this integrated circuit 20 also is provided with a state pin 201 and wrong pin 202, and this state pin 201 and wrong pin 202 output potentials produce according to integrated circuit 20 different operating states.Judge according to self having the state that measuring ability detects as for the operating state system of, this integrated circuit 20; Promptly whether be connected with output connecting pin 204 according to battery 30, and battery 30 whether charge in or charging different conditions such as finish, and see through the detection of output connecting pin 204 and judge self working state, control its state pin 201 of control and wrong pin 202 are exported corresponding control signal then, to export to connected connecting circuit 10, wherein, state pin 201 is different with the output potential under wrong pin 202 different conditions: this state pin 201 is an electronegative potential at the current potential when battery 30 is in charged state only, and other state is all high potential; Insert or the current potential that takes place when unusual is an electronegative potential and should mistake pin 202 have only when no battery 30, other state is all high potential, detailed see also shown in Figure 2.
In addition, connecting circuit 10 has first, second diode 111 and 112, its negative pole is connected with wrong pin 202 with the state pin 201 of integrated circuit 20 respectively, and first, second diode 111 all is connected with the grid of transistor 130 with 112 positive pole, this transistor 130 is a nmos pass transistor, and the source ground of this transistor 130, and drain electrode is connected with first indicator light 410; Simultaneously; the grid of transistor 130 is connected in series first, second resistance 121 respectively with drain electrode and is connected with power supply with 122 backs; wherein, first, second resistance 121 and 122 is playing current limliting in the circuit of place separately, with protective transistor 130 and first, second diode 111 and 112.
In addition, the state pin 201 of integrated circuit 20 is connected with described second indicator light 420.
Described first, second indicator light 410 and 420 is a light-emitting diode, and, the light of generation different colours during these first, second indicator light 410,420 work conductings.Generally speaking, send green glow and ruddiness when first, second indicator light 410,420 is set to conducting respectively, wherein, the green glow that first indicator light 410 sends represents that filling a little of battery 30 finishes in the cradle; And second indicator light 420 represents that battery 30 is in the charged state in the cradle when sending ruddiness; But, if battery 30 not in this cradle or battery 30 produce unusually, so, first, second indicator light 410,420 is neither can conductings and produce light.The different operating state of above-mentioned first, second indicator light 410,420 is seen shown in Figure 2.
Described first, second indicator light 410,420 anodal and connect after, and be connected with power supply with the 3rd resistance 123 serial connection backs, the 3rd resistance 123 works to limit electric current in this circuit.
Described voltage is positive 5 volts DC power supply; And the voltage of the high potential of the state pin 201 of integrated circuit 20 and wrong pin 202 is 5 volts, and the voltage of electronegative potential is 0 volt, and state pin 201 and wrong pin 202 to be all electronegative potential be effective current potential.
Below in conjunction with the 1st, 2 figure the concrete working condition of foregoing circuit under the different operating state described.
1. do not insert cradle or take place when unusual when battery 30
At this moment, the state pin 201 of integrated circuit 20 and wrong pin 202 are exported high and low current potential respectively.Because the positive and negative electrode current potential of second indicator light 420 is all high potential, thus these second indicator light, 420 not conductings and be rendered as " secretly " not luminance; And owing to the negative pole of second diode 112 is connected with wrong pin 202, be electronegative potential, at this moment, power supply, the branch road that first resistance 121 and second diode 112 are connected in series is with conducting, at this moment, second diode 112 is owing to conducting produces a voltage drop (being approximately the 0.6-0.7 volt), so the time transistor 130 the grid voltage size equal the voltage drop that 112 conductings of second diode produce, and the turn-on condition of transistor 130 is, potential difference between its this grid and the source electrode is less than conducting voltage, this conducting voltage is approximately 1.2 volts, so transistor 130 not conductings, it between the drain electrode of this transistor 130 and the source electrode high impedance of not conducting, so power supply, not conducting of branch road between second resistance 122 and the transistor 130, therefore the negative pole of first indicator light 410 also is a high potential, so this first indicator light 410 also is rendered as for not conducting " secretly " not luminance.
2. when battery 30 is in the charging
At this moment, the state pin 201 of integrated circuit 20 and wrong pin 202 are exported low, high potential respectively.Being connected with state pin 201 owing to the negative pole of second indicator light 420 is electronegative potential, and it is high potential just very, so this second indicator light, 420 conductings and send ruddiness; And owing to this moment first diode 111 also to be connected with state pin 201 be electronegative potential, so the branch road that power supply, first resistance and first diode 111 are connected in series will conducting, make the grid of transistor 130 and the potential difference not conducting between the source electrode less than conducting voltage, so the time first indicator light 410 positive and negative electrode be all high potential and not conducting is promptly not luminous.
3. when battery 30 chargings are finished
At this moment, the state pin 201 of integrated circuit 20 and wrong pin 202 are all exported high potential.Because the positive and negative electrode of second indicator light 420 is all high potential and not conducting, so not luminous; And simultaneously because first, second diode 111 and 112 negative pole are respectively with state pin 201 and wrong pin 202 and be high potential, so this is first years old, second diode 111 and 112 neither conductings, at this moment, the grid potential of transistor 130 is positive 5 volts high potential, make the grid and the conducting of the potential difference between the source electrode of transistor 130 greater than conducting voltage, so power supply, the branch road conducting that second resistance 122 is connected in series with transistor 130, this moment, the drain electrode of transistor 130 was an electronegative potential, promptly the negative pole of first indicator light 410 is an electronegative potential, and the just very high potential of this first indicator light 410, so this first indicator light, 410 conductings and send green glow.
Claims (7)
1. the control circuit of indicator light in the cradle is characterized in that this control circuit comprises:
One integrated circuit, it has an output connecting pin, be connected with battery to be charged, and a state pin, a wrong pin with output different potentials, this integrated circuit is that the mat oneself detects the output potential of state of a control pin and wrong pin with the connection status of battery;
One connecting circuit couples mutually with described integrated circuit, works in order to cooperate integrated circuit; And
One first indicator light couples mutually with above-mentioned connecting circuit, is used to refer to battery charging state; When this first indicator light is bright, finish with the pilot cell charging;
One second indicator light couples mutually with above-mentioned connecting circuit, is used to refer to battery charging state; When this second indicator light is bright, be in the charging with pilot cell;
Said integrated circuit, connecting circuit and first, second indicator light all with supply coupling, and integrated circuit is according to the different potentials of state pin, mistake pin, and whether controls first, second indicator light of conducting by connecting circuit.
2. the control circuit of indicator light in the cradle according to claim 1 is characterized in that described connecting circuit comprises:
One first, second diode, its negative pole electrically connect with the state pin of described integrated circuit, mistake pin respectively;
One transistor, the positive pole of its grid and first, second diode all electrically connects, and its source ground, and its drain electrode couples mutually with first indicator light;
Above-mentioned transistorized grid is connected with power supply after being connected in series first, second resistance respectively with drain electrode.
3. the control circuit of indicator light in the cradle as claimed in claim 1 or 2 is characterized in that described second indicator light couples mutually with the state pin of integrated circuit.
4. the control circuit of indicator light in the cradle according to claim 1 is characterized in that described power supply is 5 volts of direct currents.
5. the control circuit of indicator light in the cradle according to claim 1 is characterized in that described first, second indicator light is a light-emitting diode, and sends the color difference of light during its both conductings.
6. the control circuit of indicator light in the cradle according to claim 1, wherein said integrated circuit has an input pin, and this input pin is connected with power supply.
7. as the control circuit of indicator light in the cradle as described in the claim 5, it is characterized in that the positive pole of described first, second indicator light all with after the 3rd resistance is connected in series, couples with described power supply mutually.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520040143 CN2781629Y (en) | 2005-03-15 | 2005-03-15 | Control circuit of indicator light in charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520040143 CN2781629Y (en) | 2005-03-15 | 2005-03-15 | Control circuit of indicator light in charger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2781629Y true CN2781629Y (en) | 2006-05-17 |
Family
ID=36762827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520040143 Expired - Fee Related CN2781629Y (en) | 2005-03-15 | 2005-03-15 | Control circuit of indicator light in charger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2781629Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185941A (en) * | 2011-04-22 | 2011-09-14 | 惠州Tcl移动通信有限公司 | Mobile terminal |
-
2005
- 2005-03-15 CN CN 200520040143 patent/CN2781629Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185941A (en) * | 2011-04-22 | 2011-09-14 | 惠州Tcl移动通信有限公司 | Mobile terminal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060517 Termination date: 20120315 |