CN203312892U - Handheld identity card verification instrument voltage conversion and protection circuit - Google Patents
Handheld identity card verification instrument voltage conversion and protection circuit Download PDFInfo
- Publication number
- CN203312892U CN203312892U CN2013203537160U CN201320353716U CN203312892U CN 203312892 U CN203312892 U CN 203312892U CN 2013203537160 U CN2013203537160 U CN 2013203537160U CN 201320353716 U CN201320353716 U CN 201320353716U CN 203312892 U CN203312892 U CN 203312892U
- Authority
- CN
- China
- Prior art keywords
- circuit
- power supply
- electronic switch
- voltage conversion
- identity card
- 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
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model discloses a handheld identity card verification instrument voltage conversion and protection circuit which comprises a power supply, a power supply switching circuit, an electronic switch, a charging management unit and a voltage conversion unit. The charging management unit comprises a charging management controller and a lithium battery. The power supply is connected with the input of the power supply switching circuit. One path of output of the power supply switching circuit is connected with the first input end of the electronic switch sequentially through the charging management controller and the lithium battery. The voltage conversion unit comprises a DC-DC circuit a, a DC-DC circuit b, an intelligent detection circuit and an overvoltage protection circuit. The electronic switch is respectively connected with the DC-DC circuit a and the DC-DC circuit b. The control output end of the intelligent detection circuit is connected with the overvoltage protection circuit. The control output end of the overvoltage protection circuit is connected with the electronic switch. According to the utility model, voltage conversion can be carried out; 3.3V and 5V voltages are respectively provided for internal circuit modules; and the circuit has the advantages of intelligent control, safety and reliability.
Description
Technical field
The utility model relates to a kind of hand-held identity card checking instrument voltage transitions and protective circuit.
Background technology
The identity card checking function that hand-held identity card checking instrument is powerful and the convenience of use, allow some business departments, and particularly social supervision department has produced keen interest to it.Along with popularizing of China second-generation identity card, and the continuous increase of social population, the use of hand-held identity card checking instrument is seen everywhere especially.But meanwhile, existing identity card checking instrument has also exposed many problems.Along with people increase gradually to identity card checking equipment frequency of utilization, the shortcoming that the electricity shortage of existing identity card checking equipment and charge efficiency are not high is just more and more obvious, only rely on the increase of battery capacity, original old-fashioned charging circuit is not changed, and allows the consumer that kind of a sensation of not knowing whether to laugh or to cry is arranged.After original battery electric quantity is finished, old-fashioned charging circuit can not efficient quick battery is full of to electricity, the part charging circuit is even arranged, the information of voltage of monitoring battery in real time not only in charging process, and can not automatic shutoff circuit, also continual the charging after battery is full of electricity.There is very large infringement in this life-span to storage battery.
For existing identity card checking instrument, the special internal circuit module of part needs different direct voltages, too high voltage may cause certain infringement to circuit, and too low voltage can not allow functional module normally effectively work, and this just needs a safe and reliable voltage conversion circuit.In the voltage transitions process, if safe and reliable voltage detecting circuit and the voltage protection circuit of neither one is easy to just allow inner function module impaired.
The utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of voltage that the internal circuit module provides 3.3V and 5V that is respectively is provided, Based Intelligent Control, safe and reliable hand-held identity card checking instrument voltage transitions and protective circuit.
The purpose of this utility model is achieved through the following technical solutions: hand-held identity card checking instrument voltage transitions and protective circuit, and it comprises for power supply, power supply switch circuit, electronic switch, Charge Management unit and voltage conversion unit; The Charge Management unit comprises Charge Management controller and lithium battery; Power supply is connected with the input of power supply switch circuit, and a road output of power supply switch circuit is connected with the first input end of electronic switch with lithium battery by the Charge Management controller successively; Voltage conversion unit comprises DC-DC circuit a, DC-DC circuit b, Intelligent detection circuit and overvoltage crowbar; electronic switch is connected with DC-DC circuit b with DC-DC circuit a respectively; the control output end of Intelligent detection circuit is connected with overvoltage crowbar, and the control output end of overvoltage crowbar is connected with electronic switch.
Power source management controller described in the utility model comprises linear-charging Management Controller MCP73832.
The chip of DC-DC circuit a described in the utility model is AN_SY8008, and the chip of DC-DC circuit b is FP6291.
The beneficial effects of the utility model are: dispatch from foreign news agency can be directly voltage transitions and protective circuit by hand-held identity card checking instrument work on power; described DC-DC chip AN_SY800 and FP6291 provide respectively 3.3V and 5V DC power supply, for module and peripheral circuit.
The accompanying drawing explanation
Fig. 1 is hand-held identity card checking instrument voltage transitions and protective circuit.
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is described in further detail, but protection range of the present utility model is not limited to the following stated.
As shown in Figure 1, hand-held identity card checking instrument voltage transitions and protective circuit, it comprises power supply, power supply switch circuit, electronic switch, Charge Management unit and voltage conversion unit; The Charge Management unit comprises Charge Management controller and lithium battery; Power supply is connected with the input of power supply switch circuit, and a road output of power supply switch circuit is connected with the first input end of electronic switch with lithium battery by the Charge Management controller successively; Voltage conversion unit comprises DC-DC circuit a, DC-DC circuit b, Intelligent detection circuit and overvoltage crowbar; electronic switch is connected with DC-DC circuit b with DC-DC circuit a respectively; the control output end of Intelligent detection circuit is connected with overvoltage crowbar, and the control output end of overvoltage crowbar is connected with electronic switch.
Described lithium battery is set to discharge and recharge lithium battery, and lithium battery can be internal module the 7.4V direct voltage is provided.
Described power supply switch circuit arranges power change-over switch, is connected with the Charge Management controller, can regulate power change-over switch by the Charge Management controller, selects conducting described Charge Management unit or direct conducting two-way electronic switch, provides power supply to internal circuit.
Described Charge Management controller comprises linear-charging Management Controller MCP73832 and voltage detecting circuit, and voltage detecting circuit is by the voltage detecting of lithium battery, and the information of battery is fed back to the Charge Management controller carries out Charge Management control.Described Charge Management controller can regulate and control power supply switch circuit, to lithium battery power, power operation.Described Charge Management controller divides three phases to charge to battery: preliminary filling, controllable current charging and constant voltage charge stage.Described power source management controller is in similar charging management chip, and cost performance is the highest.
Described electronic switch is set to the two-way electronic switch, and electronic switch is connected with DC-DC circuit b with DC-DC circuit a respectively.
The DC-DC chip that described DC-DC circuit a arranges is AN_SY8008, and the DC-DC chip arranged in described DC-DC circuit b is FP6291, and DC-DC circuit a and DC-DC circuit b are respectively the direct voltage that internal circuit and module provide 3.3V and 5V.
Described Intelligent detection circuit arranges voltage detecting circuit, whether surpasses the preset value threshold voltage for detection of voltage, or whether voltage fluctuation is over preset value voltage fluctuation threshold values, to realize voltage protection function.As: voltage bleeds off excess enthalpy voltage or deenergization protection while surpassing the preset value threshold voltage.
Described overvoltage crowbar is shunted the use voltage to internal circuit for the protection of the two-way electronic switch; as: while in electric line, producing overvoltage, overvoltage crowbar can be dredged, and the voltage of excess enthalpy is bled off; or send feedback information to the two-way electronic switch, the deenergization protection.
Claims (3)
1. hand-held identity card checking instrument voltage transitions and protective circuit, it is characterized in that: it comprises power supply, power supply switch circuit, electronic switch, Charge Management unit and voltage conversion unit; The Charge Management unit comprises Charge Management controller and lithium battery; Power supply is connected with the input of power supply switch circuit, and a road output of power supply switch circuit is connected with the first input end of electronic switch with lithium battery by the Charge Management controller successively; Voltage conversion unit comprises DC-DC circuit a, DC-DC circuit b, Intelligent detection circuit and overvoltage crowbar; electronic switch is connected with DC-DC circuit b with DC-DC circuit a respectively; the control output end of Intelligent detection circuit is connected with overvoltage crowbar, and the control output end of overvoltage crowbar is connected with electronic switch.
2. hand-held identity card checking instrument voltage transitions according to claim 1 and protective circuit, it is characterized in that: described Charge Management controller comprises linear-charging Management Controller chip MCP73832.
3. hand-held identity card checking instrument voltage transitions according to claim 1 and protective circuit, it is characterized in that: the chip of described DC-DC circuit a is AN_SY8008, the chip of DC-DC circuit b is FP6291.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203537160U CN203312892U (en) | 2013-06-20 | 2013-06-20 | Handheld identity card verification instrument voltage conversion and protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203537160U CN203312892U (en) | 2013-06-20 | 2013-06-20 | Handheld identity card verification instrument voltage conversion and protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203312892U true CN203312892U (en) | 2013-11-27 |
Family
ID=49619067
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203537160U Expired - Lifetime CN203312892U (en) | 2013-06-20 | 2013-06-20 | Handheld identity card verification instrument voltage conversion and protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203312892U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105262348A (en) * | 2015-09-25 | 2016-01-20 | 江苏峰谷源储能技术研究院有限公司 | Handset power adapter |
-
2013
- 2013-06-20 CN CN2013203537160U patent/CN203312892U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105262348A (en) * | 2015-09-25 | 2016-01-20 | 江苏峰谷源储能技术研究院有限公司 | Handset power adapter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202134955U (en) | Power supply circuit for remote meter reading terminal | |
| CN207150246U (en) | A kind of ups power device | |
| CN205986274U (en) | Multichannel battery charging system | |
| CN102185358A (en) | Simple and practical movable uninterruptible power supply | |
| CN203312892U (en) | Handheld identity card verification instrument voltage conversion and protection circuit | |
| CN204719450U (en) | A kind of equipment of Based Intelligent Control multiple stage charging pile | |
| CN202260572U (en) | Hand-held device for stably supplying power to batteries of second-generation identity card reader | |
| CN104485716A (en) | Solar electrical bicycle charging device additionally installed on parking shed | |
| CN204835586U (en) | Show portable portable power source complete, that output current is big | |
| CN204304538U (en) | A kind of solar electric vehicle charging device being installed at carport | |
| CN203813535U (en) | Power supply device used for electricity larceny prevention inspection device | |
| CN207134835U (en) | Public bus type power supply | |
| CN203193323U (en) | Mobile phone capable of outward charging | |
| CN204794216U (en) | Wireless portable power source that charges | |
| CN203859557U (en) | Lithium battery protection plate with self-checking load | |
| CN110138074A (en) | A kind of power supply circuit for electronic equipment and its control method | |
| CN209805434U (en) | Portable multifunctional power supply circuit | |
| CN102170153B (en) | Device and method for supplying power for batteries of handheld second-generation ID card reader | |
| CN203326685U (en) | High frequency switch power supplying system | |
| CN103683364A (en) | Circuit control system of back-up power supply | |
| CN202111490U (en) | Mobile uninterrupted power source of being simple and practical | |
| CN203352226U (en) | Solar charging multistage switching control device | |
| CN202474938U (en) | Portable multifunctional back-up power supply for digital products | |
| CN206948006U (en) | A kind of cell phone intelligent charging module | |
| CN204695221U (en) | A kind of emergent computer power supply with clocking capability |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131127 |