CN1157835C - Voltage stabilization and electric power and voltage regulating and monitoring protection circuit unit - Google Patents
Voltage stabilization and electric power and voltage regulating and monitoring protection circuit unit Download PDFInfo
- Publication number
- CN1157835C CN1157835C CNB011420774A CN01142077A CN1157835C CN 1157835 C CN1157835 C CN 1157835C CN B011420774 A CNB011420774 A CN B011420774A CN 01142077 A CN01142077 A CN 01142077A CN 1157835 C CN1157835 C CN 1157835C
- Authority
- CN
- China
- Prior art keywords
- voltage
- electric power
- battery
- detecting
- switch
- 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 - Fee Related
Links
Images
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention relates to a circuit device with the functions of voltage stabilization, power supply voltage detection and back current prevention, which at least comprises a voltage adjuster for providing stable voltage for a system, and a voltage detecting unit for detecting the electric power of a battery. When the electric power of the battery is higher than a standard, the voltage adjuster provides the stable voltage for the system, and simultaneously charges a capacitor so that the electric power charged into the capacitor can be used as standby electric power when the electric power of the battery is insufficient; when the electric power of the battery is lower than the standard, the voltage detecting unit provides a signal for the system so that the system enters an electricity saving mode, and simultaneously, a back current preventing switch is turned off so as to prevent the standby electric power of the capacitor back flowing to the voltage adjuster. At this point, the standby electric energy stored by the capacitor provides the standby electric power for the system so as to take emergency measures, for example, data is stored, and then the system is shut down; or the other battery is replaced; or an AC power supply is connected to the system so as to deal with the emergency, etc.
Description
Technical field
The present invention is a kind of relevant for the electronic detection circuit, particularly possesses supply voltage detecting and reverse battery reverse current prevention circuit about a kind of, so that the circuit design that system takes emergency measures under instant non-firm power avoids data with protection system and damages.
Background technology
The use of portable electronic consumer products, a kind of situation is in indoor use AC power, and utilize the rectifier carry, so that its operating voltage to be provided, but if emphasize its portability, modal mode be utilize that these portable electronic consumer products are equipped with substantially with machine battery, its electric power is provided.Yet common portable electronic consumer products when voltage is lower than predetermined value, just can make system's instability if battery is changed in untimely shutdown.At this moment, if processing in time may not cause the loss of data, and cause user's puzzlement.For example, notebook computer, personal digital aid (PDA) PDA or the like electronic product.
Though, Duo Shuo notebook computer on the market, personal digital aid (PDA) PDA or electronic dictionary all have the battery electric power arrangement for detecting, when the battery electric power arrangement for detecting detects power shortage, promptly send caution sound, to notify the user to shut down and to store.Yet above-mentioned battery electric power arrangement for detecting all is to belong to unidirectional detecting, has power supply just can move.When battery electric power was higher than standard, the battery electric power arrangement for detecting did not produce any effect.And when battery electric power was lower than standard, the battery electric power arrangement for detecting promptly provided a signal to system, to send caution sound.Yet above-mentioned battery electric power arrangement for detecting is to rely on battery electric power is provided, and when battery arrived a certain level if electric power descends too fast, the battery electric power arrangement for detecting did not just produce effect, so cause the shakiness of system.
Summary of the invention
In view of this, the present invention will provide a circuit design to improve above-mentioned problem.
Purpose of the present invention is providing a kind of voltage stabilizing and supply voltage monitoring protection circuit unit, in order to portable type electronic product one burning voltage that uses battery to be provided.
Detecting of the disclosed supply voltage of the present invention and back current prevent circuit, can be in order to system's one burning voltage that uses battery to be provided, and when this battery electric power is not enough, provide this system reserve electric power immediately, with the circuit design of taking emergency measures.
Circuit of the present invention comprises at least: voltage regulator, in order to the voltage of system stability to be provided; The detecting voltage unit in order to the battery electric power detecting to be provided, when battery electric power is higher than standard, provides stabilized power supply to system by voltage regulator, and voltage regulator charges with the non-firm power as the battery electric power deficiency to electric capacity simultaneously.When battery electric power was lower than standard, the detecting voltage unit provided a signal to system, to enter battery saving mode.Simultaneously adverse current prevents that switch from cutting out, and is back to voltage regulator with the non-firm power that prevents electric capacity.At this moment, the stored stand-by electric energy of electric capacity will provide system reserve electric power to take Emergency Countermeasures this moment, for example, carry out data storage, again with system closedown.Or change another battery, or connect AC AC power etc. and met an urgent need.
Preferred embodiment of the present invention will be done more detailed elaboration in attached explanation in back and accompanying drawing.
Description of drawings
Fig. 1 is voltage stabilizing of the present invention and supply voltage monitoring protection circuit unit, in order to system's one burning voltage that uses battery to be provided, has when battery electric power is not enough, provides this system reserve electric power immediately, with the circuit design of taking emergency measures.
Fig. 1 is according to one of the present invention embodiment designed voltage stabilizing and supply voltage monitoring protection circuit unit; in order to system's one burning voltage that uses battery to be provided; have when battery electric power is not enough, provide this system reserve electric power immediately, to take the circuit design of countermeasure.Comprise a detecting voltage unit 100, adverse current and prevent switch Q1, capacitor C 1 and low voltage regulator (the low-dropped out voltageregulator) LDOIC that decreases.Wherein: this battery provides the voltage regulator LDOIC of electric power, in order to the voltage of this system stability to be provided; This battery provides the detecting voltage unit 100 of electric power, in order to the battery electric power detecting to be provided, when this battery electric power is not enough, provides a signal to system, to enter battery saving mode; One capacitor C 1 prevents that with an adverse current switch Q1 is connected, in order to this system reserve electric power to be provided; This adverse current prevents that switch Q1 is connected between the output of the output of this voltage regulator LDOIC and detecting voltage unit 100, in order to prevent that the non-firm power of this capacitor C 1 is back to this voltage regulator LDOIC when this battery electric power is not enough.Said system is a portable type electronic product, can store data or the PDA of function such as processing data, and computerized dictionary or notebook computer etc., or have concurrently and transmit data function PDA mobile phone etc.And the foregoing circuit element all is to provide electric power by same battery if do not specify.
Wherein, adverse current prevents that switch Q1 from being the integrated circuit of a similar PMOS transistor function, when adverse current prevents that the grid G input voltage level of switch Q1 from being " 0 ", as shown in the figure, allows LDOIC to output current to the source S that adverse current prevents switch Q1 from output OUT.And make electric current flow to the capacitor C 1 that is connected in series with source S to charge via drain D.When capacitor C 1 charges to the electric capacity saturation voltage, provide a burning voltage to hold to system via VCC.When in addition, adverse current prevents that switch Q1 has conducting than the lower impedance of common metal oxide semi conductor transistor (MOS).But when the grid G input voltage level of Q1 was " 1 ", adverse current prevented that switch Q1 from closing, and relatively has the impedance higher than single MOS transistor.In other words, adverse current prevents that switch Q1 from being unidirectional conducting integrated circuit, also can be the PMOS transistor.
100 of detecting voltage unit comprise one second resistance R 2, a bipolar transistor Q2, one first resistance R 1 and a detecting voltage (voltage detector) IC110.2 cross-over connections of second resistance R prevent source S and the grid G of switch Q1 in adverse current.Whether detecting voltage IC110 still is higher than a reference voltage in order to the electric power of detecting battery.When if battery electric power is sufficient, cell voltage connects detecting voltage IC110 by the BAT1 end, and through comparing with reference voltage, then the voltage potential of the V fail of detecting voltage IC110 output is the signal of " 1 ", at this moment, bipolar transistor Q2 provides electric power by battery by the BAT2 end simultaneously.Open (ON) transistor via bias resistance R1 from base stage B.Therefore, the collector terminal BAT FAIL of transistor Q2 is protected in voltage level " 0 ".So continue to provide burning voltage to hold to system according to above-mentioned LDOIC, please note that LDOIC provides electric power by battery from the BAT3 end through VCC.
Another kind of situation, if detecting voltage IC110 detects the standard that battery electric power is lower than setting by the BAT1 end, or battery is when being pulled out, signal that changes from high to low of V fail output of detecting voltage IC110.Therefore, bipolar transistor Q2 will close (OFF).And be the current potential of " 1 " via the output BAT-FAIL output-voltage levels of transistor Q2, this current potential is about the terminal voltage (VCC) of capacitor C 1.At this moment, the BAT-FAIL reporting system enters battery saving mode, to save electric energy.And the electric energy of being laid in by capacitor C 1 provides of short duration electric energy via the VCC end.This moment is because adverse current prevents the existence of switch Q1, and is (grid G is in voltage level " 1 ") in off position, therefore, the electric energy of electric capacity can adverse current to LDOIC.And be lower than the standard of setting at battery electric power, or battery pulled out replenish electric power before, the time length of capacitor C 1 supply system electric power, the size of apparent capacity C1 and deciding.System can utilize in the time of capacitor C 1 supply system electric power, taked Emergency Countermeasures, for example, carried out data storage, again with system closedown.Or change another battery, or connect AC AC power etc. and met an urgent need.
Advantage of the present invention, the present invention can provide the portable type electronic product burning voltage, even and battery electric power when not enough, can provide the enough time emergent, therefore avoid the damage of data.
The above is preferred embodiment of the present invention only, is not in order to limit the interest field of applying for a patent of the present invention; All other ends break away from the equivalence of being finished under the disclosed spirit and change or modification, all should be included in the claim scope of the present utility model.
Claims (4)
1, a kind of voltage stabilizing and supply voltage monitoring protection circuit unit; so that system's one burning voltage that uses battery to be provided on the electronic product, and when this battery electric power is not enough, provide this system reserve electric power immediately; with the circuit design of taking emergency measures, it is characterized in that comprising:
One provides the voltage regulator of electric power by this battery, in order to the voltage of this system stability to be provided;
One provides the detecting voltage unit of electric power by this battery, in order to the battery electric power detecting to be provided, when this battery electric power is not enough, provides a signal to system, to enter battery saving mode;
One electric capacity prevents that with adverse current switch is connected, in order to this system reserve electric power to be provided; And
One adverse current prevents switch, is connected between the output of the output of this voltage regulator and detecting voltage unit, in order to prevent that the non-firm power of this electric capacity is back to this voltage regulator when this battery electric power is not enough.
2, voltage stabilizing as claimed in claim 1 and supply voltage monitoring protection circuit unit; it is characterized in that: above-mentioned detecting voltage unit comprises one first resistance, a transistor, one second resistance and a detecting voltage IC; wherein this second resistance cross-over connection prevents the grid and the source terminal of switch in this adverse current; this transistorized emitter grounding; the collection utmost point is connected in the grid that this adverse current prevents switch; base stage is connected in the output of this detecting voltage IC, and is that bias resistance provides electric power by this battery with this first resistance.
3, voltage stabilizing as claimed in claim 1 and supply voltage monitoring protection circuit unit is characterized in that: above-mentioned adverse current prevents that switch from being the PMOS transistor.
4, voltage stabilizing as claimed in claim 1 and supply voltage monitoring protection circuit unit is characterized in that: the two-plate of above-mentioned electric capacity is connected in this adverse current of formation and prevents between the transistorized source electrode of PMOS and grounded reference potential of switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011420774A CN1157835C (en) | 2001-09-10 | 2001-09-10 | Voltage stabilization and electric power and voltage regulating and monitoring protection circuit unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011420774A CN1157835C (en) | 2001-09-10 | 2001-09-10 | Voltage stabilization and electric power and voltage regulating and monitoring protection circuit unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1335664A CN1335664A (en) | 2002-02-13 |
| CN1157835C true CN1157835C (en) | 2004-07-14 |
Family
ID=4676608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011420774A Expired - Fee Related CN1157835C (en) | 2001-09-10 | 2001-09-10 | Voltage stabilization and electric power and voltage regulating and monitoring protection circuit unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1157835C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100353286C (en) * | 2004-09-03 | 2007-12-05 | 索尼株式会社 | Power supply circuit and electronic device |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100561403C (en) * | 2005-10-17 | 2009-11-18 | 鸿富锦精密工业（深圳）有限公司 | The DC voltage circuit for detecting |
| WO2009093884A1 (en) * | 2008-01-23 | 2009-07-30 | Vazquez Hernandez Jorge | System of smart contacts and method used in electrical appliances for optimizing the use of electricity and protecting said appliances |
| CN101841232B (en) * | 2010-03-02 | 2013-01-30 | 北京星网锐捷网络技术有限公司 | Redundancy backup processing method and redundancy backup control circuit of capacitor |
| CN104392841A (en) * | 2014-12-03 | 2015-03-04 | 安徽省库仑动力自动化科技有限公司 | Capacitor capable of continuously and steadily discharging by grouping electrodes |
-
2001
- 2001-09-10 CN CNB011420774A patent/CN1157835C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100353286C (en) * | 2004-09-03 | 2007-12-05 | 索尼株式会社 | Power supply circuit and electronic device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1335664A (en) | 2002-02-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN211266506U (en) | Control circuit | |
| JP3848239B2 (en) | Battery charging method, battery charging circuit, and portable electronic device having battery | |
| US6833983B2 (en) | Current limiting super capacitor charger | |
| EP3487031A1 (en) | Power management circuit | |
| US20040080892A1 (en) | Battery over voltage and over current protection circuit and adjustable adapter current limit circuit | |
| WO2020156141A1 (en) | Charging circuit and electronic device | |
| CN103607009A (en) | Charging and discharging circuit with automatic protecting function | |
| CN115378370B (en) | Audio amplification circuit, board card and electronic equipment | |
| WO2019174415A1 (en) | Charging circuit and electronic cigarette | |
| US20080054852A1 (en) | Charging system and charging method | |
| CN101316044B (en) | Charging device capable of providing backward current and inrush current protection | |
| CN209860582U (en) | Power protection circuit, electron cigarette, power protection device | |
| CN1157835C (en) | Voltage stabilization and electric power and voltage regulating and monitoring protection circuit unit | |
| CN111884303B (en) | Charging control circuit, charging control method and electronic device | |
| CN206922502U (en) | Power down protection control circuit and electronic equipment | |
| JP3080046B2 (en) | Secondary battery protection circuit | |
| CN114285128A (en) | Outdoor equipment power supply control circuit, outdoor equipment power supply system and outdoor equipment | |
| CN106712483A (en) | Synchronous rectification circuit, charger and protection method of charger | |
| CN217590284U (en) | Low-power consumption portable power source control circuit and electronic equipment | |
| CN220305433U (en) | Interface circuit and electronic equipment | |
| CN214176951U (en) | Power supply circuit of real-time clock | |
| CN109995107A (en) | A kind of detection device | |
| CN212646801U (en) | Voltage detection circuit and electronic device | |
| CN220190893U (en) | Power supply circuit and KVM switch | |
| CN212969122U (en) | Quick charging device for mobile terminal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20040714 Termination date: 20180910 |