CN2595065Y - Power supply circuit of portable product - Google Patents
Power supply circuit of portable product Download PDFInfo
- Publication number
- CN2595065Y CN2595065Y CN 02294341 CN02294341U CN2595065Y CN 2595065 Y CN2595065 Y CN 2595065Y CN 02294341 CN02294341 CN 02294341 CN 02294341 U CN02294341 U CN 02294341U CN 2595065 Y CN2595065 Y CN 2595065Y
- Authority
- CN
- China
- Prior art keywords
- circuit
- change
- power
- power supply
- over circuit
- 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.)
- Expired - Lifetime
Links
Images
Landscapes
- Direct Current Feeding And Distribution (AREA)
Abstract
The utility model relates to a power supply circuit in a portable product, which comprises the power supply control circuit, a key, a DC/DC change-over circuit. The utility model is characterized in that the DC/DC change-over circuit comprises a DC/DC chip with a shutdown pin; the power supply control circuit is connected with the input end of a DC power, the key and the DC/DC change-over circuit; the power supply control circuit is connected with the shutdown pin of the DC/DC chip in the DC/DC change-over circuit to control the working status of the DC/DC change-over circuit. The key is a single-contact type key; the DC/DC change-over circuit is connected with the input end of the DC power via a field effect transistor of which the grid is connected with the power supply control circuit, and the power supply control circuit is controlled by a microprocessor or a hardware logic circuit. The utility model has the advantage that the DC/DC change-over circuit can be connected or disconnected with the DC power of external connection each time when the key is pushed; the cost and the power consumption are low when the utility model is used in the portable product.
Description
Technical field
The utility model relates to power circuit, relate in particular in a kind of portable product power circuit.
Background technology
Along with the rapid rise and the extensive use of radio communication and portable type electronic product, power circuit design causing day by day people's attention and attention, the particularly design of low-power consumption application product in the product.For different application products, the requirement of system design difference, also can there be bigger difference in its power circuit design.The low-power consumption application product wide to market prospects, that the new product release time is short does not adopt as yet in its power circuit scheme under the situation of special-purpose Integrated Solution design, needs to select reliable and stable, the simple power circuit design of realization.
Extensively adopt two kinds of power circuit designs at all kinds of portable products (as PDA, Cellphone) at present.
First kind of scheme, as shown in Figure 1, this power circuit comprises power supply control chip 11, button 12, DC/DC change-over circuit 13 and system central processor 14.Power management and control that power supply control chip 11 is realized whole system, guarantee the needed working power voltage of circuit realization whole system, central authorities of system microcontroller 14 is not directly realized control to DC/DC change-over circuit 13, but carry out the exchange of information with power supply control chip 11, assist to finish the realization of systemic-function and be 15 power supplies of systemic-function circuit.The following problem that this power supply controlling schemes exists: first, in the portable product design, often use powered battery, power supply control chip is concerning power input, it often must have enough low operating voltage, so that self can normally start and work, concerning the output of power supply control chip, it often must have sufficiently high output voltage again to realize the control to power circuit, there is evident difference between the two, therefore, very high requirement is proposed other circuit unit in power supply control chip and the system; Second, in the portable product design, power consumption is the key factor that must consider, power supply control chip is the power circuit in management effectively and the control system, self must continuous operation, and lasting electric consumption energy, self be difficult to realize the low-power consumption working method that this directly influences the product serviceability; The 3rd, the use of power supply control chip directly can cause the raising of system product cost, and its function is strong more good more, and the cost increase also can be high more.
Second kind of scheme, as shown in Figure 2, power circuit advances to comprise the power supply control chip that integrates and system's central microprocessor 21, button 22, DC/DC change-over circuit 23.DC/DC change-over circuit 23 is to 24 power supplies of systemic-function circuit.The main difference of second kind of scheme and first kind of scheme is that a power supply control chip and central authorities of system microcontroller chip integrate; Angle from power supply control, can solve first problem that exists in above-mentioned first kind of scheme, but problems such as the energy that power control circuit consumed in the central microcontroller chip that is brought, the increase of central microcontroller chip cost still are difficult to fine solution.In addition, the function of power supply control chip is integrated into scheme in the system central authorities microcontroller chip, being extensive use of at all kinds of portable products of greatly having limited power control function.
Summary of the invention
The purpose of this utility model provides the power circuit in a kind of portable product, stresses to consider low-power consumption, the low cost of circuit.
In order to reach above purpose, power circuit of the present utility model has adopted following technical scheme, and described power circuit comprises:
Power control circuit, button, DC/DC change-over circuit;
Described DC/DC change-over circuit comprises that has a DC/DC chip of closing pin;
The input of described power control circuit and DC power supply, described button and described DC/DC change-over circuit link to each other, and what described power control circuit connected DC/DC chip in the described DC/DC change-over circuit closes pin to control the operating state of described DC/DC change-over circuit;
Described button is a single contact formula button;
Described DC/DC change-over circuit links to each other with the DC power supply input;
Described DC/DC change-over circuit links to each other with described DC power supply input by a field effect transistor, and the grid of described field effect transistor links to each other with described power control circuit;
Described button links to each other with described DC/DC change-over circuit;
Described power control circuit is by microprocessor or hardware logic electric circuit control.
The utility model adopts single contact formula button, whenever press one-touch, the DC/DC change-over circuit opens or cuts out, use the more convenient realization of shutdown pin that microcontroller or hardware logic electric circuit can be by control DC/DC change-over circuit to the unlatching of DC/DC change-over circuit or close the control of operating state, increase control flexibility circuit system or circuit unit working power.
Description of drawings
Fig. 1 is the block diagram of the power circuit in a kind of portable product of prior art;
Fig. 2 is the block diagram of the power circuit in the another kind of portable product of prior art;
Fig. 3 is the block diagram of the power circuit in the portable product of the present utility model;
Fig. 4 is an embodiment of the present utility model, uses the circuit diagram of microprocessor controls power control circuit;
Fig. 5 is an embodiment of the present utility model, uses the circuit diagram of the circuit of hardware logic electric circuit control power control circuit.
Embodiment
Further describe the technical solution of the utility model and execution mode below in conjunction with accompanying drawing.
Fig. 3 is the block diagram of power circuit of the present utility model, and the utility model power circuit comprises:
Power control circuit 31, button 32 and DC/DC change-over circuit 33;
DC/DC change-over circuit 33 comprises that has a DC/DC chip of closing pin;
The input of power control circuit 31 and DC power supply, button 32 and DC/DC change-over circuit 33 link to each other, and what power control circuit 31 connected DC/DC chip in the DC/DC change-over circuits 33 closes pin to control the operating state of DC/DC change-over circuit 33;
Button 32 is single contact formula buttons;
DC/DC change-over circuit 33 links to each other with the DC power supply input;
DC/DC change-over circuit 33 links to each other with the DC power supply input by a field effect transistor, and the grid of this field effect transistor links to each other with power control circuit 31;
Button 32 links to each other with DC/DC change-over circuit 33;
Power control circuit 31 is by microprocessor or hardware logic electric circuit control;
Power control circuit 31 is controlled DC/DC change-over circuit 33 by the shutdown pin of the DC/DC chip in the control DC/DC change-over circuit 33 and whether is worked, DC/DC change-over circuit 33 by DC power supply input power supply and output services voltage to systemic-function circuit 34, whenever press one-touch, the DC/DC change-over circuit opens successively or cuts out.
Fig. 4 is an embodiment of the present utility model.
Among this embodiment, power control circuit is resistance R 41, R42, R43, capacitor C 41, C42, diode D41, D42 and triode Q41; Button is single contact formula button S41; The DC/DC change-over circuit is resistance R 44, R45, R46, capacitor C 43, C44, the DC/DC chip LTC3400 of inductance L 41 and Linear company.
Among this embodiment, power control circuit links to each other with DC power supply input, button and field effect transistor Q42; The DC/DC change-over circuit links to each other with the DC power supply input by field effect transistor Q42, and the grid of field effect transistor Q42 links to each other with power control circuit.
The power control circuit of this embodiment is controlled by microprocessor.
The operation principle of this embodiment is as follows: as shown in Figure 4, under the situation of not conducting of field effect transistor Q42, DC/DC change-over circuit power input and external power supply disconnection, its output does not have operating voltage Vout output, other functional units of system do not have operating voltage, quit work.
The shutdown pin function of DC/DC change-over circuit is the function pin 4 of LTC3400 chip, among this embodiment, the shutdown pin is connected with DC/DC change-over circuit power input through resistance R 44, when input terminal voltage when the DC/DC change-over circuit is worked input voltage range normally, guarantee that this circuit is in opening.
After pressing switch S 41, form voltage between the field effect transistor Q42 pin 2 and 1, impel field effect transistor Q42 conducting, after the field effect transistor Q42 conducting, the DC/DC change-over circuit is worked immediately, export the operational voltage value that other functional unit needs at its output, because there is microcontroller MCU in system, so behind the MCU electrification reset, can pin MCU_PIN2 be set to low level by its program control, the MCU_PIN2 pin is put the low triode Q41 saturation conduction that directly causes, and locking field effect transistor Q42 pin 1 is certain low level value, keep field effect transistor Q42 conducting, thereby realize that pressing button can connect the function of importing power supply.Button can discharge after pressing, and the time of button actual contact generally can be to reach the requirement of electric power starting.
After the MCU work in the systemic-function unit, except that the MCU_PIN2 pin is set to the low level, also need the MCU_PIN1 pin is set to high level, the MCU program monitors the situation of change of pin MCU_PIN1 pin level in running; When button is pressed, the MCU_PIN1 pin level is step-down immediately, microcontroller MCU monitors this variation, and wait for that button discharges, and after button discharges, puts height with the MCU_PIN2 pin level, this pin level is put height, cause triode Q41, field effect transistor Q42 ends, thereby realizes pressing the function that button can disconnect the input power supply.Button can discharge after pressing, and the time of button actual contact generally can be with powered-down.
This embodiment realizes that the single contact button presses, finish the DC/DC change-over circuit and import being connected and disconnection of power supply, the components and parts that circuit increases only are common low price triode, field effect transistor, diode, resistance, electric capacity etc., and negligible amounts, realize that the cost of required function is very cheap.
Field effect transistor Q42 is when its conducting, and conducting resistance is very low, and much smaller than 1 ohm, the power consumption when making its real work is very little.Because field effect transistor is voltage-controlled device, circuit as shown in Figure 2 can be less so that the actual saturation conduction current value of triode Q41 is selected, thus the power consumption when reducing triode Q41 real work greatly.
Fig. 5 is another embodiment of the present utility model.
Among this embodiment, power control circuit is resistance R 51, R52, R53, R54, R57, capacitor C 52, C54, diode D51, triode Q51 and Schmidt trigger U52A, U52B; Button is single contact formula button S51; The DC/DC change-over circuit is resistance R 55, R56, capacitor C 51, C53, the DC/DC chip LTC3400 of inductance L 51 and Linear company.
Among this embodiment, power control circuit links to each other with DC power supply input, button and DC/DC change-over circuit; Button links to each other with the DC/DC change-over circuit; The DC/DC change-over circuit links to each other with the DC power supply input.
The power control circuit of this embodiment is controlled by hardware logic electric circuit.
The operation principle of this embodiment is as follows: as shown in Figure 5, in the ordinary course of things, the shutdown pin of DC/DC change-over circuit is pulled to low level, the DC/DC change-over circuit is not worked, output does not have operating voltage Vout output, when pressing switch S 51, the input external power supply links to each other with LTC3400 pin of chip shutdown by resistance R 51, diode D51, this pin level uprises, the DC/DC change-over circuit is worked immediately, the operational voltage value that other functional unit needs in its output output system.As can be seen from the figure, the operating voltage of output makes Schmidt trigger U2A and U2B work equally, and in the pin 4 output services voltage level values of Schmidt trigger U2B, after resistance R 52, R53 dividing potential drop, produce the LTC3400 chip at the shutdown pin and normally open the necessary level value of work, if when the external input supply voltage of ratio that this level value is selected is high, also can force diode D51 to end, cutting off fully influences input; Button unclamps, and circuit can be finished auto-lock function.
After the work of DC/DC change-over circuit, concerning resistance R 57, capacitor C 54 loops, charge constant is bigger, and before the DC/DC change-over circuit was finished self-locking, triode Q51 was in cut-off state all the time, can not produce any influence to the unlatching of DC/DC change-over circuit.
In case the DC/DC change-over circuit has been opened work, and after circuit has entered normal operating conditions, Schmidt trigger U2A pin 2 input high level values, triode Q51 is in conducting state, if press button, in the choose reasonable circuit after the resistance of resistance R 51, R52, R53, can guarantee that DC/DC change-over circuit shutdown pin level puts lowly, the DC/DC change-over circuit quits work, the release of LTC3400 chip shutdown pin level, the output voltage values step-down, circuit quits work.
This embodiment realizes that the single contact button presses, finish being connected and the function of disconnection of DC/DC change-over circuit and input power supply, but the components and parts that circuit increases are cheap Schmidt trigger chip, triode, diode, resistance, electric capacity etc., and negligible amounts, omit microprocessor simultaneously, further reduced the cost of realizing required function.
This embodiment by selecting the parameter value of components and parts in the circuit, makes that the actual saturation conduction current value of triode Q51 is less when DC/DC change-over circuit operate as normal, thus the power consumption when having reduced triode Q51 real work.Select the Schmidt trigger element of low-power consumption in the circuit, can guarantee the characteristic of low-power consumption from circuit design.
Owing to used technique scheme, the utility model to realize that whenever by one-touch, the DC/DC change-over circuit is connected with external direct current power supply successively or disconnects, and is applied in the portable product, reached the requirement of low cost and low-power consumption.
Claims (4)
1. the power circuit in the portable product comprises power control circuit, button, DC/DC change-over circuit,
It is characterized in that,
Described DC/DC change-over circuit comprises that has a DC/DC chip of closing pin;
The input of described power control circuit and DC power supply, described button and described DC/DC change-over circuit link to each other, and what described power control circuit connected DC/DC chip in the described DC/DC change-over circuit closes pin to control the operating state of described DC/DC change-over circuit;
Described button is a single contact formula button;
Described DC/DC change-over circuit links to each other with the DC power supply input.
2. the power circuit in the portable product as claimed in claim 1 is characterized in that, described DC/DC change-over circuit links to each other with described DC power supply input by a field effect transistor, and the grid of described field effect transistor links to each other with described power control circuit.
3. the power circuit in the portable product as claimed in claim 1 is characterized in that, described button links to each other with described DC/DC change-over circuit.
4. the power circuit in the portable product as claimed in claim 1 is characterized in that, described power control circuit is by microprocessor or hardware logic electric circuit control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02294341 CN2595065Y (en) | 2002-12-31 | 2002-12-31 | Power supply circuit of portable product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02294341 CN2595065Y (en) | 2002-12-31 | 2002-12-31 | Power supply circuit of portable product |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2595065Y true CN2595065Y (en) | 2003-12-24 |
Family
ID=33751831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02294341 Expired - Lifetime CN2595065Y (en) | 2002-12-31 | 2002-12-31 | Power supply circuit of portable product |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2595065Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100392537C (en) * | 2004-04-08 | 2008-06-04 | 上海华虹集成电路有限责任公司 | Onboard power supply unit managing method |
| CN100458612C (en) * | 2006-11-24 | 2009-02-04 | 北京中星微电子有限公司 | Apparatus for controlling power supply, method and electron system |
| CN110198070A (en) * | 2019-07-04 | 2019-09-03 | 深圳致晟文化创新有限公司 | Double-direction radio charging/discharging apparatus |
| WO2021035481A1 (en) * | 2019-08-26 | 2021-03-04 | 广东高普达集团股份有限公司 | Power control circuit having single-button-press control function, and mobile terminal |
-
2002
- 2002-12-31 CN CN 02294341 patent/CN2595065Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100392537C (en) * | 2004-04-08 | 2008-06-04 | 上海华虹集成电路有限责任公司 | Onboard power supply unit managing method |
| CN100458612C (en) * | 2006-11-24 | 2009-02-04 | 北京中星微电子有限公司 | Apparatus for controlling power supply, method and electron system |
| CN110198070A (en) * | 2019-07-04 | 2019-09-03 | 深圳致晟文化创新有限公司 | Double-direction radio charging/discharging apparatus |
| WO2021035481A1 (en) * | 2019-08-26 | 2021-03-04 | 广东高普达集团股份有限公司 | Power control circuit having single-button-press control function, and mobile terminal |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101770248B (en) | Intermittent power supply micropower standby control circuit | |
| CN100533911C (en) | Power supply device for implementing dormant state of vehicle hybrid power controller | |
| CN2595065Y (en) | Power supply circuit of portable product | |
| CN202145692U (en) | LED flicker filter circuit | |
| CN202310206U (en) | Control circuit of ultra-low-power single wire power supply touch switch | |
| CN201397454Y (en) | Intermittence-type power-supply micro-power-consumption standby control circuit | |
| CN201039333Y (en) | Voltage conversion circuit and TV set with this circuit | |
| CN2904456Y (en) | Frequency reducing circuit for power managing chip | |
| CN2904457Y (en) | Three state feedback power controlling circuit | |
| CN201532756U (en) | Power supply switch device for LCD TV | |
| WO2022242037A1 (en) | Power supply circuit, power supply system and smart door lock | |
| CN103078370B (en) | Power module of automobile intelligent switch | |
| CN101175227A (en) | IC chip and its electric control method | |
| CN201237718Y (en) | Power supply control circuit of single-chip | |
| CN218848651U (en) | Power supply circuit and electric equipment | |
| CN102291115B (en) | Voltage multiplying circuit, relay driving circuit and intelligent controller | |
| CN207305018U (en) | A kind of intelligent controller applied to lighting system | |
| CN110351924A (en) | A kind of LED drive circuit of low standby power loss | |
| CN219322135U (en) | Low-power consumption power supply control circuit and electric equipment | |
| CN2859596Y (en) | Power shifter for household appliance | |
| CN201467324U (en) | Low power consumption CPU standby commutation circuit | |
| CN100472384C (en) | Power circuit | |
| CN2452195Y (en) | Electric power apparatus to maintain ultralow current of readiness for information products | |
| CN219105355U (en) | Key control circuit | |
| CN100470988C (en) | Live-line plugging control circuit for pluggable module and control method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20130104 Granted publication date: 20031224 |