CN1790862A - Dry battery type portable telephone set charging circuit - Google Patents
Dry battery type portable telephone set charging circuit Download PDFInfo
- Publication number
- CN1790862A CN1790862A CNA2004101014830A CN200410101483A CN1790862A CN 1790862 A CN1790862 A CN 1790862A CN A2004101014830 A CNA2004101014830 A CN A2004101014830A CN 200410101483 A CN200410101483 A CN 200410101483A CN 1790862 A CN1790862 A CN 1790862A
- Authority
- CN
- China
- Prior art keywords
- circuit
- mentioned
- telephone set
- portable telephone
- charging
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a dry-cell portable charge circuit for telephone set to display the charge action on LED when charging, which comprises: a dry cell as power supply for circuit, a voltage step-up chopper, a LED 105 for display, a control circuit 102 to generate drive signal for said chopper, a detection circuit 103 to detect the conduction time of said chopper, and a light circuit tp drive said LED when conduction time achieves threshold.
Description
Technical field
The present invention relates to utilize dry cell to the charge portable telephone set charging circuit of (normally promptly charging) of portable telephone set internal battery, particularly relate to and when actual the charging, to show the dry battery type portable telephone set charging circuit that this charging is moved with LED.
Background technology
Dry battery type portable telephone set charger in the past, most not being provided with is used to show to be just at the device (LED) of charged state.In addition, in the portable telephone set charger, also have and possess the charger that is used to show the charging action and shows the LED that is full of electricity.
Fig. 6 is a block diagram of representing the example of the dry battery type portable telephone set charger that possesses the LED that is used to show the charging action in the past.In the charger 5 of Fig. 6, dry cell BC (supply voltage: E) be connected input terminal a1, the a2 of power circuit (DC/DC converter) 51.Be connected with charging current limiter resistance R 1 between a power circuit 51 and the lead-out terminal (b1), be connected with the display circuit of forming by LED current-limiting resistance R2 and LED (D1 represents with symbol) between lead-out terminal b1, the b2.Portable telephone set internal battery 52 is connected lead-out terminal b1, b2, lights LED (D1) when charging.
Fig. 7 represents that in the past the portable telephone set internal battery that possesses the LED that is used to show the charging action is with the block diagram of the example of charger.In the charger 6 of Fig. 7, industrial AC power supplies is connected input terminal a1, the a2 of power circuit (AC/DC converter) 61.Be connected with charging current limiter resistance R 1 between a power circuit 61 and the lead-out terminal (b1).In addition, the back segment of power circuit 61 is connected with the comparison circuit 63 that constitutes of resistance R 3, R4, R5, R6 and feedback resistance R7 by comparator C MP, input one side.In addition, be connected with between the lead-out terminal of the terminal of a side of charging current limiter resistance R 1 of power circuit 61 and comparator C MP and be connected with the display circuit that constitutes by LED current-limiting resistance R2 and LED (D1 represents with symbol).Portable telephone set internal battery 62 is connected lead-out terminal b1, b2, for example, lights LED (D1) when charging.
Summary of the invention
Yet, in the charger 5 of Fig. 6, behind the driving power circuit 51, just portable telephone set internal battery 52 being powered, LED (D1) is lighted by the charging voltage between lead-out terminal b1, the b2.Therefore, no matter whether carrying out charging to portable telephone set internal battery 52, if power circuit 51 drives, just light LED (D1), the user also is judged as the charging action and carries out under the state that can not charge.
Specifically, the situation of charging at (1) portable telephone set internal battery 52 refusals;
(2) portable telephone set internal battery 52 is full of the situation of electricity; (3) the dry cell capacity of charger 5 reduces, and is exporting can not charge but enough light the voltage condition etc. of LED, and LED (D1) is also lighted.
General LED if apply voltage more than or equal to forward voltage Vf between anode and negative electrode, just lights.The forward voltage Vf of LED is owing to glow color, electric current, method for making, luminescent material etc. are former thereby different, and general red LED is approximately about 1.5～2.0 (V).Therefore, even under the situation that the dry cell capacity of the charger 5 of above-mentioned (3) has reduced, LED also will be driven.
In addition, in the charger 6 of Fig. 7, can under the situation of the portable telephone set internal battery 62 of flowing through more than or equal to the electric current of certain value, light LED.
That is, in charger 6, detect the potential difference Vd of charging current limiter resistance R 1, when the potential difference Vd that detects more than or equal to certain value, (R1 * i=Vd, i are charging current) comparator C MP action, LED (D1) has electric current to flow through and is lighted.
But this charger 6 is because many, the part price height of number of parts, so, just use as the charger that is used for the portable telephone set internal battery at last, can not use as dry battery type portable telephone set charger with sale at a low price.
The objective of the invention is to, a kind of dry battery type portable telephone set charging circuit is provided, described dry battery type portable telephone set charging circuit has simple circuit configuration, can only just show this charging action when actual the charging.
Dry battery type portable telephone set charging circuit of the present invention is a power supply with the dry cell, has the boosted switch adjuster of supplying with predetermined charging power to the charging terminal of portable telephone set, it is characterized in that, comprises: LED is used for charging and shows; Control circuit generates the on signal of the boost chopper be used to drive above-mentioned boosted switch adjuster; Chopper testing circuit turn-on time detects turn-on time of above-mentioned boost chopper; And the LED lighting circuit, when above-mentioned chopper testing circuit turn-on time has reached predetermined value detected this turn-on time, drive above-mentioned LED.
Dry battery type portable telephone set charging circuit of the present invention mainly is applicable to the urgent charging device of portable telephone set.
In dry battery type portable telephone set charging circuit of the present invention, can be with the CR integrating circuit of above-mentioned chopper testing circuit turn-on time as the above-mentioned on signal of input, and can constitute following mode: above-mentioned LED lighting circuit drives when the magnitude of voltage of above-mentioned CR integrating circuit has reached predetermined value.At this moment, above-mentioned LED lighting circuit has (+) terminal that is connected above-mentioned dry cell, resistance and the transistor switch between (-) terminal, above-mentioned LED is connected between above-mentioned transistor switch and the ground wire, and the output voltage of above-mentioned CR integrating circuit is input to the control terminal of transistor switch.
According to the present invention, a kind of dry battery type portable telephone set charging circuit can be provided, described dry battery type portable telephone set charging circuit has simple circuit configuration, i.e. lower manufacturing cost, can only show just when reality is charged that this charging moves.
Description of drawings
Fig. 1 is the functional block diagram of expression dry battery type portable telephone set charging circuit of the present invention;
Fig. 2 is the physical circuit figure of dry battery type portable telephone set charging circuit shown in Figure 1;
Fig. 3 extracts the circuit diagram that chopper testing circuit turn-on time, LED lighting circuit and LED in the circuit shown in Figure 2 represent out;
Fig. 4 is the control signal in presentation graphs 2, the circuit shown in Figure 3, the terminal voltage of electric capacity, the sequential chart of transistor switch conduction and cut-off state;
Fig. 5 is the front elevation that the dry battery type portable telephone set charging device of dry battery type portable telephone set charging circuit of the present invention has been installed in expression;
Fig. 6 is a block diagram of representing the example of the dry battery type portable telephone set charger that possesses the LED that is used to show the charging action in the past;
Fig. 7 represents that in the past the portable telephone set internal battery that possesses the LED that is used to show the charging action is with the block diagram of the example of charger.
Embodiment
Fig. 1 is the functional block diagram of expression dry battery type portable telephone set charging circuit of the present invention.In Fig. 1, dry battery type portable telephone set charging circuit 100 has: the LED105 that boost chopper 101, control circuit 102, chopper testing circuit turn-on time 103, LED lighting circuit 104 and being used to charged and shown.Boost chopper 101 has such inductance coil of aftermentioned and transistor switch.
In addition, as shown in Figure 2, in the circuit of reality, constitute the boosted switch adjuster by boost chopper 101 and output circuit 106.
In the dry battery type portable telephone set charging circuit 100 of Fig. 1, behind the connection circuit power (from the power supply of dry cell 200), control circuit 102 is just according to prearranged signals (S3) control boost chopper 101.Thus, be fed into boost chopper 101 from the electric power (S1) of dry cell 200, boost chopper 101 charges to portable telephone set internal battery 300 with predetermined charge voltages and predetermined charging current (representing with charging current S2 at this).
On the other hand, be input to chopper testing circuit turn-on time 103 from the control signal S3 of control circuit 102 after, chopper testing circuit turn-on time 103 can detect the turn-on time of boost chopper 101.Specifically, chopper testing circuit turn-on time 103 can be made of following CR integrating circuit.For example, at chopper testing circuit turn-on time 103 is that CR integrating circuit, output voltage (constituting the charging voltage of the electric capacity of this CR integrating circuit) have reached under the situation of predetermined value (detection signal is represented with S4), just connect LED lighting circuit 104, light LED105 by electric power (S5) from dry cell 200.
In addition, as portable telephone set internal battery 300, use lithium-ions battery usually.The specified output of lithium-ions battery generally is about 3.6～3.7 (V).Lithium-ions battery need charge with the voltage that is not less than above-mentioned voltage and with the electric current that is not less than 80mA, uses usually more than or equal to 4.5 (V), less than the voltage of 5.7 (V), and the electric current of 300mA～600mA charges.
Fig. 2 is the physical circuit figure of dry battery type portable telephone set charging circuit 100 shown in Figure 1.In the dry battery type portable telephone set charging circuit 100 of Fig. 2, dry cell 200 is connected input terminal a1, a2.At this, dry cell is two battery strings that save 1.5 (V) to be unified into 3 (V) use.
In addition, boost chopper 101 has inductance coil L, transistor switch Q1 (is FET at this) and diode (Schottky barrier diode SBD).Control circuit 102 is made of the IC that the control signal of PWM or PFM can be outputed to the control terminal of transistor switch Q1.
Chopper testing circuit turn-on time 103 constitutes as the integrating circuit of being made up of resistance R 2 and capacitor C 2.LED lighting circuit 104 is made of LED current-limiting resistance R3 and transistor switch Q2 (is bipolar transistor at this).LED105 is a red LED.
In addition, in Fig. 2, the deferent segment of dry battery type portable telephone set charging circuit 100 (between lead-out terminal b1, the b2) is connected with the output circuit of being made up of output current limiting resistance R 1 and level and smooth capacitor C 1 106.
In Fig. 2, form the boosted switch adjuster by boost chopper 101 and output circuit 106.
In the dry battery type portable telephone set charging circuit 100 of Fig. 2, after the transistor Q1 conducting, energy just is accumulated on the inductance coil L.Then, after transistor Q1 ended, the energy that is accumulated in inductance coil L just supplied to output circuit 106 by Schottky barrier diode SBD, and charging current i is fed into portable telephone set internal battery 300.
Therefore, the conduction period of transistor Q1 (conduction time of inductance coil L) is long more, and the energy that then is accumulated among the inductance coil L just becomes big more, thereby it is big more that charging current i also just becomes.
In the present embodiment, if charging current i surpasses certain value, therefore the conduction period of transistor Q1, just lights LED105 in this case also just greater than the regular hour.
Extract chopper testing circuit turn-on time 103, LED lighting circuit 104 and LED105 out, in Fig. 3, represent.With reference to Fig. 3, the integrating circuit that the control signal of transistor switch Q1 (the control signal CTRL that A is ordered) utilization is made up of resistance R 2, capacitor C 2 carries out integration, after the voltage that B is ordered (voltage of capacitor C 2) reaches predetermined value Vsh (Vsh=Vbe+Vf), then transistor switch Q2 conducting, electric current flows through LED105, and this LED lights.
At this, Vbe is the voltage between emitter-base stage of transistor switch Q2, and Vf is the forward voltage of LED105.
Fig. 4 is expression control signal CTRL, the terminal voltage VC2 of capacitor C 2, the sequential chart of transistor switch Q2 conduction and cut-off state.
In the present embodiment, LED105 is connected emitter one side of transistor switch Q2.Thus, the threshold voltage Vsh of transistor switch Q2 conducting can be improved, the value of raising equals the magnitude of voltage of Vf (for example, about 1.7 (V)).
In addition, when the waveform that A is ordered becomes low level, can discharge the electric charge that is accumulated on the capacitor C 2 rapidly (promptly, can make the difference of Vsh and low level current potential become big), thus, the high level time of A point waveform shortens, and when charging current i does not flow through portable telephone set internal battery 300, guarantees that LED extinguishes.
When dry cell 200 power consumptions, make cell voltage E step-down after, even charging current i is identical, the high level time that A is ordered is also with elongated, but, in the present embodiment, as mentioned above, LED105 is connected transistor switch Q2 emitter one side, and, by the direct driving LED 105 of cell voltage E.
Therefore, light, establish the voltage between emitter-collector electrode that Vce is transistor switch Q2, establish And if be the electric current of LED105 of flowing through, meet the following conditions in order to make LED:
Vf＜E-Vce-If * R3, i.e. E＞Vf+Vce+If * R3.
At this, establish Vf=1.7 (V), Vce=0.2 (V), If * R3=0.1 (V), then E＞1.7+0.2+0.1=2.0 (V).
Fig. 5 is the figure of example that the dry battery type portable telephone set charging device of above-mentioned dry battery type portable telephone set charging circuit 100 has been installed in expression.In the dry battery type portable telephone set charging device 400 of Fig. 5, after portion of terminal 401 (being equivalent to b1, b2) is connected the charging terminal of not shown portable telephone set, only when the charging current from dry cell 200 flows through and carrying out suitable charging, just light LED105.
Claims (3)
1. a dry battery type portable telephone set charging circuit is a power supply with the dry cell, has the boosted switch adjuster of supplying with predetermined charging power to the charging terminal of portable telephone set, it is characterized in that, comprises:
LED is used for charging and shows;
Control circuit generates the on signal of the boost chopper be used to drive above-mentioned boosted switch adjuster;
Chopper testing circuit turn-on time detects turn-on time of above-mentioned boost chopper; And
The LED lighting circuit when above-mentioned chopper testing circuit turn-on time has reached predetermined value detected this turn-on time, drives above-mentioned LED.
2. battery type portable telephone set charging circuit according to claim 1 is characterized in that:
Above-mentioned chopper testing circuit turn-on time is the CR integrating circuit of the above-mentioned on signal of input, and above-mentioned LED lighting circuit drives when the magnitude of voltage of above-mentioned CR integrating circuit has reached predetermined value.
3. battery type portable telephone set charging circuit according to claim 2 is characterized in that:
Above-mentioned LED lighting circuit, have (+) terminal that is connected above-mentioned dry cell, resistance and the transistor switch between (-) terminal, above-mentioned LED is connected between above-mentioned transistor switch and the ground wire, and the output voltage of above-mentioned CR integrating circuit is input to the control terminal of above-mentioned transistor switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2004101014830A CN1790862A (en) | 2004-12-16 | 2004-12-16 | Dry battery type portable telephone set charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2004101014830A CN1790862A (en) | 2004-12-16 | 2004-12-16 | Dry battery type portable telephone set charging circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1790862A true CN1790862A (en) | 2006-06-21 |
Family
ID=36788447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2004101014830A Pending CN1790862A (en) | 2004-12-16 | 2004-12-16 | Dry battery type portable telephone set charging circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1790862A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106941390A (en) * | 2017-05-16 | 2017-07-11 | 南京铁道职业技术学院 | A kind of closely digital data transmission interference preventer |
-
2004
- 2004-12-16 CN CNA2004101014830A patent/CN1790862A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106941390A (en) * | 2017-05-16 | 2017-07-11 | 南京铁道职业技术学院 | A kind of closely digital data transmission interference preventer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102256403B (en) | Load determination device and illumination apparatus using same | |
| CN101389168B (en) | High-voltage large power LCD constant current driving device | |
| CN103974502A (en) | Electronic control device of LED light engine and application thereof | |
| CN101527983B (en) | White-light LED illumination driving circuit on basis of current-type charge pump | |
| CN101808444A (en) | Constant-current control method of power switch type LED (Light-Emitting Diode) drive circuit and circuit thereof | |
| TWI477192B (en) | Dc dimming led driving circuit | |
| CN101795515B (en) | Started overshoot current suppression circuit | |
| CN102811530A (en) | Voltage-rising type LED driving circuit and lamp | |
| CN102403895B (en) | Self-excitation Sepic converter based on MOSFET | |
| TWM451772U (en) | DC dimming LED driving circuit | |
| CN1868107A (en) | Boost converter | |
| CN201001215Y (en) | Sound, light-operated constant-current LED lighting lamp | |
| CN1717858A (en) | Energy saving startup circuit for power supply | |
| CN2896782Y (en) | Luminating device | |
| CN102403896B (en) | Self excited Boost converter based on MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) | |
| CN201657408U (en) | Starting overshoot current suppression circuit | |
| CN1790862A (en) | Dry battery type portable telephone set charging circuit | |
| CN202077230U (en) | LED power circuit matched with electronic transformer | |
| CN210429267U (en) | LED backlight driving circuit | |
| CN202713705U (en) | Buck-boost hybrid drive circuit for light emitting diode | |
| CN102510216A (en) | MOSFET-based auto-excitation type Cuk converter | |
| CN209627755U (en) | A kind of solar street lamp controller based on MPPT | |
| CN102522892B (en) | Auto-excitation-type Buck converter based on metal oxide semiconductor field effect transistor (MOSFET) | |
| CN102510217B (en) | MOSFET-based auto-excitation type Zeta converter | |
| JP3999719B2 (en) | Charging circuit for dry cell phone |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20060621 |