CN203632353U - Single-chip microcomputer power down protection circuit - Google Patents
Single-chip microcomputer power down protection circuit Download PDFInfo
- Publication number
- CN203632353U CN203632353U CN201320879983.1U CN201320879983U CN203632353U CN 203632353 U CN203632353 U CN 203632353U CN 201320879983 U CN201320879983 U CN 201320879983U CN 203632353 U CN203632353 U CN 203632353U
- Authority
- CN
- China
- Prior art keywords
- chip microcomputer
- power supply
- diode
- battery
- main power
- 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
- 238000007599 discharging Methods 0.000 claims abstract description 11
- 230000000087 stabilizing effect Effects 0.000 claims description 13
- 230000001681 protective effect Effects 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000036186 satiety Effects 0.000 description 1
- 235000019627 satiety Nutrition 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Images
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model discloses a single-chip microcomputer power down protection circuit which comprises a battery charging and discharging module and a single-chip microcomputer interface module connected with the battery charging and discharging module. The battery charging and discharging module comprises a resistor R1, a diode D1 and a charging battery BT1. The cathode of the charging battery BT1 is connected with the cathode GND of a main power supply. The anode of the charging battery is connected with the cathode of the diode D1 through the resistor R1. The anode of the diode D1 is connected with the anode VCC of the main power supply. The single-chip microcomputer interface module comprises a diode D2 and a resistor R2. The anode VCC of the main power supply is connected with the anode of a single-chip microcomputer power supply through the diode D1. The anode of the single-chip microcomputer power supply is connected with the resistor R1 through the resistor R2. The cathode of the single-chip microcomputer power supply is connected with the cathode GND of the main power supply. With the single-chip microcomputer power down protection circuit, a single-chip microcomputer can still operate when the main power supply fails and can charge a battery when the main power supply works. The single-chip microcomputer power down protection circuit has a function of over charge protection and is characterized by being simple in structure, low in cost, high in practicability and the like.
Description
Technical field
The utility model relates to power technique fields, more specifically, relates to a kind of single-chip microcomputer power-down protection circuit.
Background technology
Conventionally,, in Single Chip Microcomputer (SCM) system, in the time that main power source VCC loses, be referred to as power down.After power down, single-chip microcomputer can quit work, and clock can stop going ahead, and this result is undesirable often in many occasions of real-time clock that need, in order to guarantee that single-chip microcomputer still can keep operation in the time that principal voltage loses, people just utilize dry cell to proceed power supply to Single Chip Microcomputer (SCM) system.At present the system of single-chip microcomputer possesses the interior condition that can implement smoothly " power down protection ", and Here it is: single-chip microcomputer allows in the time that voltage is low to moderate the even smaller power voltage supply of 2V.Still can guarantee its most basic operation (outside input/output function will be lost efficacy or stop).Battery is in the time that main power source loses, and it is very valuable providing the energy, battery power now to the continuation operation of single-chip microcomputer, is all often to calculate with " uA " level.And also have a unescapable result, and be exactly the prolongation along with guard time, the electric weight of battery also can be finished.So protective circuit has a parameter for the longest guard time, can not exceed, otherwise protection will be lost efficacy in use.When battery is through after the use of guard time, just need electric energy supplement, drop into protection work to can " feast to satiety " while protecting next time.So, have again the problem how to charge the battery.
Utility model content
In order to solve this situation of above-mentioned proposition, the utility model proposes a kind of simple in structure, practical single-chip microcomputer power-down protection circuit, solve preferably after Single Chip Microcomputer (SCM) system loses main power source, how to guarantee the problem that it moves substantially.
The purpose of this utility model can be by reaching by the following technical solutions:
A kind of single-chip microcomputer power-down protection circuit, is characterized in that, comprises battery charging and discharging module and the microcontroller power supply interface module being attached thereto;
Described battery charging and discharging module comprises resistance R 1, diode D1 and rechargeable battery BT1, the negative pole of rechargeable battery BT1 meets the negative pole GND of main power source, the positive pole of rechargeable battery connects the negative pole of diode D1 by resistance R 1, the positive pole of diode D1 meets the anodal VCC of main power source;
Described microcontroller power supply interface module comprises diode D2 and resistance R 2, the anodal VCC of main power source connects the positive pole of microcontroller power supply by diode D1, and the positive pole of microcontroller power supply is received in resistance R 1 by resistance R 2, the negative pole of microcontroller power supply meets the negative pole GND of main power source.
In the preferred scheme of one, described battery charging and discharging module also comprises voltage stabilizing didoe ZD1, voltage stabilizing didoe ZD1 and rechargeable battery BT1 parallel connection; This voltage stabilizing didoe ZD1 is for preventing that rechargeable battery BT1 from overcharging.
The utlity model has following outstanding beneficial effect: 1, circuit structure is simple.This circuit is by two diodes, two resistance, and a battery and a voltage stabilizing didoe composition, simple in structure, with low cost; 2, this has battery charging function, and has simple over-charge protective, practical.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described, but execution mode of the present utility model is not limited to this.
As Fig. 1, a kind of single-chip microcomputer power-down protection circuit, comprises battery charging and discharging module 2 and the microcontroller power supply interface module 1 being attached thereto;
Described battery charging and discharging module 2 comprises resistance R 1, diode D1, rechargeable battery BT1 and voltage stabilizing didoe ZD1, rechargeable battery BT1 and voltage stabilizing didoe ZD1 parallel connection, the negative pole of rechargeable battery BT1 meets the negative pole GND of main power source, the positive pole of rechargeable battery connects the negative pole of diode D1 by resistance R 1, the positive pole of diode D1 meets the anodal VCC of main power source;
Described microcontroller power supply interface module 1 comprises diode D2 and resistance R 2, the anodal VCC of main power source connects the positive pole of microcontroller power supply by diode D1, and the positive pole of microcontroller power supply is received in resistance R 1 by resistance R 2, the negative pole of microcontroller power supply meets the negative pole GND of main power source.
The operation principle of the present embodiment:
With reference to Fig. 1, in the time that main power source is normal, single-chip microcomputer is by VCC Power supply, and meanwhile, VCC power supply is by diode D1 and resistance R 1, and to rechargeable battery, BT1 charges, to guarantee the abundance of rechargeable battery BT1 electric weight.The size of suitably selecting resistance R 1, can guarantee that charging current and charging interval are all more reasonable.In the present embodiment, supply voltage is 5V, the specification of rechargeable battery BT1 is 3.2V, 120mAh, charging interval was chosen in about 12 hours, the charging current of selecting is 10 mA, so resistance R 1 just should be selected the resistance of 440 ohm, should be noted that the conduction voltage drop of the diode D1 of its series connection when calculating.The voltage stabilizing didoe ZD1 in parallel with rechargeable battery BT1 uses for preventing battery overcharge; the voltage that the voltage stabilizing value of this voltage stabilizing didoe ZD1 should be full of after electricity with battery approaches; along with the increase of battery electric quantity; the voltage at its two ends also can raise; after rechargeable battery BT1 is full of electricity, the voltage of its both end voltage and voltage stabilizing didoe ZD1 approaches; charging current is to flow away by voltage stabilizing didoe ZD1, and the rechargeable battery BT1 that can not flow through has so just realized the over-charge protective to battery.When losing after main power source, rechargeable battery BT1 is just by resistance R 1, resistance R 2, power port to single-chip microcomputer is powered, supply current is by producing pressure drop after resistance R 1, resistance R 2, and while arriving the power port of single-chip microcomputer, voltage can be lower than the voltage of battery itself, can pass through adjusting resistance R2, in the situation that guaranteeing that monolithic machine can keep operation, the minimizing current drain of trying one's best, this need to configure the operating state of single-chip microcomputer certainly.The effect of diode D1 and diode D2 is to guarantee that rechargeable battery BT1 can not pass through main power source circuit other device bleed off electric current to system, causes loss of electric quantity of battery after main power source is lost.It is exactly more than the operation principle of this circuit.
Above-described execution mode of the present utility model, does not form the restriction to the utility model protection range.Any modification of having done within spiritual principles of the present utility model, be equal to and replace and improvement etc., within all should being included in claim protection range of the present utility model.
Claims (2)
1. a single-chip microcomputer power-down protection circuit, is characterized in that, comprises battery charging and discharging module and the microcontroller power supply interface module being attached thereto;
Described battery charging and discharging module comprises resistance R 1, diode D1 and rechargeable battery BT1, the negative pole of rechargeable battery BT1 meets the negative pole GND of main power source, the positive pole of rechargeable battery connects the negative pole of diode D1 by resistance R 1, the positive pole of diode D1 meets the anodal VCC of main power source;
Described microcontroller power supply interface module comprises diode D2 and resistance R 2, the anodal VCC of main power source connects the positive pole of microcontroller power supply by diode D1, and the positive pole of microcontroller power supply is received in resistance R 1 by resistance R 2, the negative pole of microcontroller power supply meets the negative pole GND of main power source.
2. single-chip microcomputer power-down protection circuit according to claim 1, is characterized in that, described battery charging and discharging module also comprises voltage stabilizing didoe ZD1, voltage stabilizing didoe ZD1 and rechargeable battery BT1 parallel connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320879983.1U CN203632353U (en) | 2013-12-30 | 2013-12-30 | Single-chip microcomputer power down protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320879983.1U CN203632353U (en) | 2013-12-30 | 2013-12-30 | Single-chip microcomputer power down protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203632353U true CN203632353U (en) | 2014-06-04 |
Family
ID=50818795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320879983.1U Expired - Lifetime CN203632353U (en) | 2013-12-30 | 2013-12-30 | Single-chip microcomputer power down protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203632353U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066879A (en) * | 2018-08-31 | 2018-12-21 | 厦门科华恒盛股份有限公司 | A kind of charging circuit of on-board battery, charging method and single-chip computer control system |
| CN110350654A (en) * | 2019-08-12 | 2019-10-18 | 卡瓦科尔牙科医疗器械（苏州）有限公司 | SD card for medical instrument protects circuit |
-
2013
- 2013-12-30 CN CN201320879983.1U patent/CN203632353U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066879A (en) * | 2018-08-31 | 2018-12-21 | 厦门科华恒盛股份有限公司 | A kind of charging circuit of on-board battery, charging method and single-chip computer control system |
| CN110350654A (en) * | 2019-08-12 | 2019-10-18 | 卡瓦科尔牙科医疗器械（苏州）有限公司 | SD card for medical instrument protects circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204068347U (en) | A kind of solar control circuit | |
| CN201699585U (en) | Novel intelligent voltage stabilizing circuit | |
| CN204271698U (en) | A kind of power management monitoring device being applied to transmission line online monitoring system | |
| CN205212423U (en) | Protection circuit of electric motor car intelligent charging ware | |
| CN204465104U (en) | A kind of portable set charging power source circuit | |
| CN105515159A (en) | Solar energy controller power source circuit | |
| CN206099459U (en) | A activation circuit for battery management system | |
| CN203243071U (en) | Power supply charging and discharging circuit and mobile power supply | |
| CN203632353U (en) | Single-chip microcomputer power down protection circuit | |
| CN203788025U (en) | Storage battery charging and discharging management circuit | |
| CN204190446U (en) | A kind of accumulator routing inspection circuit | |
| CN203326667U (en) | Solar energy-based fault indicator power supplying power source | |
| CN204481518U (en) | A kind of solar powered power circuit | |
| CN104538937A (en) | Low-power protection apparatus of lithium ion battery | |
| CN204651907U (en) | Battery protecting circuit and system | |
| CN206908363U (en) | The low high voltage converter circuitry of lithium battery charger output voltage | |
| CN203896370U (en) | Wired router provided with own emergency power supply | |
| CN103779839B (en) | A kind of automatic shutoff start-up circuit adopting rechargeable battery to power | |
| CN204481563U (en) | A kind of quick converter circuitry of power of powering for microcomputer | |
| CN206820732U (en) | An a kind of key switch electromechanics road for low-power consumption | |
| CN203135502U (en) | Portable solar mobile power supply | |
| CN202997654U (en) | Constant-voltage constant-current charging circuit | |
| CN202076822U (en) | Overdischarge activation circuit of handset cell | |
| CN201260085Y (en) | Solar energy controller | |
| CN203933095U (en) | A kind of novel being full of automatically shuts down lithium electricity charger |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140604 |
|
| CX01 | Expiry of patent term |