CN101174770A - Charging protection method and device - Google Patents

Charging protection method and device Download PDF

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Publication number
CN101174770A
CN101174770A CNA200710177859XA CN200710177859A CN101174770A CN 101174770 A CN101174770 A CN 101174770A CN A200710177859X A CNA200710177859X A CN A200710177859XA CN 200710177859 A CN200710177859 A CN 200710177859A CN 101174770 A CN101174770 A CN 101174770A
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China
Prior art keywords
unit
charging path
output
voltage detection
charger
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CNA200710177859XA
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Chinese (zh)
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CN101174770B (en
Inventor
李启瑞
马驰
姜宁波
李超
胡卫东
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中兴通讯股份有限公司
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The present invention relates to a charging protection method and a device. The method includes the following steps: whether the polarity of a charger is inverted and whether the output pressure of the charger is lager than the preset overpressure protection threshold value should be tested; if one of the items is yes, the step of cutting off the charging channel should be implemented so as to end the current process; otherwise, the step of getting through the charging channel should be implemented. The charging protection method provided by the present invention can provide overpressure protection and anti-inversion function at the same time, achieve the effective protection in the charging process of the terminal equipment and ensure the effect charging of the battery without reducing the actual charging pressure of the terminal equipment in the normal charging state.

Description

Charge protection method and device
Technical field
The present invention relates to terminal equipment charging device and control method thereof, particularly relate to a kind of charge protection method and device.
Background technology
At present; various mobile devices and some electric products; as terminal equipment; built-in or changeable type battery charges to it all to need to utilize charging device; in the charging process; should avoid owing to overvoltage or the anti-slotting damage that causes mobile device or battery; (the MII of China's Ministry of Information Industry for this reason; Ministry ofInformation Industry) issued " mobile phone charger and interfacing require and method of testing " in November, 2006, regulation mobile device inside must have charging overvoltage protection function and counnter attack plugging function.
In the prior art, adopt following several modes to realize for charging overvoltage protection is general:
Realize charging overvoltage, overcurrent protection function with fuse.This method circuit is fairly simple; directly in the charging path, be connected in series fuse; but this method has the shortcoming of irrecoverable property, when charger output voltage or electric current are higher than reservation threshold, and blowout; play overvoltage, overcurrent protection; after this prevent to damage terminal equipment, but can't repair voluntarily after the blowout, so terminal equipment can't charge again; after having only the fuse that more renews, could charge normal operation to battery.
At the charger overvoltage crowbar of connecting with the terminal charge input.This method can realize charging overvoltage protection, and can recover voluntarily, and when charging voltage during less than reservation threshold, terminal can normally be charged again.But the shortcoming of this method is: overvoltage crowbar certain chip commonly used realizes; cost is higher; and there is not the counnter attack plugging function; when between terminal equipment and the charger during error-polarity connection; the positive pole that is charger is connected to the negative pole of terminal equipment, the negative pole of charger is connected to the positive pole of terminal equipment, and terminal equipment or battery can be damaged.
The power diode of connecting between charger output and terminal equipment charging input end is realized the counnter attack plugging function.Though this scheme can play and anti-insert protective effect, because there is certain voltage drop in the power diode conducting, is generally 0.7V, can reduce the actual charging voltage of terminal equipment under the normal charging condition like this, cause the battery can't be sufficient.
Summary of the invention
In view of this; main purpose of the present invention is to provide a kind of charge protection method and device; this method can possess overvoltage protection and the slotting function of counnter attack simultaneously; this device can be realized the function that overvoltage protection and counnter attack are inserted by a small amount of simple elements; and under normal charging condition, can not reduce the actual charging voltage of terminal equipment.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of charge protection method, this method may further comprise the steps: whether A, to detect charger polarity anti-inserted, and whether detect the charger output voltage greater than predetermined excess pressure protection threshold values, if having one in the binomial for being, execution in step B then, otherwise execution in step C; B, disconnection charging path finish current flow process; C, connection charging path.
Between charge protection method steps A of the present invention and the step C, further comprise, carry out the delay operation for connection charging path of scheduled time length.
After the charge protection method step B of the present invention, the further whether anti-inserted operation of the detection charger polarity among the execution in step A.
After the charge protection method step C of the present invention, further detect the charger output voltage among the execution in step A whether greater than the operation of predetermined excess pressure protection threshold values.
A kind of charge protection device, described device connects the output of charger and the Power Management Unit of terminal equipment, comprise the anti-detecting unit of inserting, voltage detection unit and charging path control unit, wherein, the anti-detecting unit of inserting, connect charger output and voltage detection unit and charging path control unit, whether be used to detect charger polarity anti-inserted, and adjust its output signal according to testing result and be anti-state or the normal condition of inserting, its output signal is transferred to voltage detection unit and charging path control unit, output signal is when instead inserting state, off voltage detecting unit and charging path control unit; Voltage detection unit, connect anti-detecting unit and the charging path control unit inserted, be used to detect the charger output voltage whether greater than predetermined excess pressure protection threshold values, and to adjust its output signal according to testing result be overvoltage condition or normal condition, its output signal is transferred to charging path control unit; Charging path control unit, connect anti-Power Management Unit of inserting detecting unit and voltage detection unit and terminal equipment, be used for output signal according to anti-slotting detecting unit and voltage detection unit, the conducting of control charging path or end, when anti-output signal of inserting detecting unit and voltage detection unit is normal condition, the conducting of control charging path, otherwise control charging path ends.
Wherein, described charge protection device also comprises the detected state delay unit; described detected state delay unit is between voltage detection unit and charging path control unit; be used for when the voltage detection unit output signal is normal condition; that carries out scheduled time length outputs signal to the delay operation of charging path control unit to voltage detection unit; when the voltage detection unit output signal was overvoltage condition, directly the output signal with voltage detection unit sent to charging path control unit.
Wherein, the described anti-detecting unit of inserting comprises first diode, and its anode is connected to the charger output, and negative electrode is connected to voltage detection unit, detected state delay unit and charging path control unit.
Wherein, described voltage detection unit comprises first resistance, second resistance and first triode, first resistance, one end connects the anti-output of inserting detecting unit, the other end connects the base stage of an end and first triode of second resistance, second resistance, one end connects the base stage of first resistance and first triode, other end ground connection, the collector electrode of first triode are connected to the anti-output of inserting detecting unit, grounded emitter.
Wherein, described charging path control unit comprises second triode, the 4th resistance and first metal-oxide-semiconductor and second metal-oxide-semiconductor, wherein, one end of the 4th resistance connects the anti-output of inserting detecting unit, the other end connects the collector electrode of second triode, the base stage of second triode is connected to the output of detected state delay unit, grounded emitter, the grid of first metal-oxide-semiconductor and second metal-oxide-semiconductor is connected to the collector electrode of second triode, the source electrode of first metal-oxide-semiconductor is connected to the output of charger, drain electrode is connected to the drain electrode of second metal-oxide-semiconductor, and the source electrode of second metal-oxide-semiconductor is connected to the Power Management Unit of terminal equipment.
Wherein, described detected state delay unit comprises the 3rd resistance and first electric capacity, and the 3rd resistance one end connects the anti-output of inserting detecting unit, and the other end connects the output of voltage detection unit, and connects an end of first electric capacity, the other end ground connection of first electric capacity.
Charge protection method of the present invention, the function that can provide overvoltage protection and counnter attack to insert simultaneously realizes the effective protection in the terminal equipment charging process.
Charge protection device of the present invention can be realized overvoltage protection and counnter attack plugging function by a small amount of simple components, and is simple in structure, cost is low.And under normal charging condition, can not reduce the actual charging voltage of terminal equipment, guarantee effective charging of battery.
Description of drawings
Fig. 1 is the structural representation of charge protection device of the present invention;
Fig. 2 is the flow chart of charge protection method of the present invention;
Fig. 3 is the circuit diagram of an embodiment of charge protection device of the present invention.
Embodiment
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
As shown in Figure 1, charge protection device of the present invention connects the Power Management Unit of charger and terminal equipment, comprises anti-detecting unit, voltage detection unit, detected state delay unit and the charging path control unit inserted, wherein,
The anti-detecting unit of inserting, connect charger output and voltage detection unit, detected state delay unit and charging path control unit, whether be used to detect charger polarity anti-inserted, and adjust its output signal according to testing result and be anti-state or the normal condition of inserting, anti-output signal of inserting detecting unit is transferred to voltage detection unit, detected state delay unit and charging path control unit, when monitoring charger polarity when anti-inserted, by output signal is the anti-state off voltage detecting unit of inserting, detected state delay unit and charging path control unit, when avoiding instead inserting all devices are caused damage, when not monitoring charger polarity when anti-inserted, by the output normal condition, make voltage detection unit, detected state delay unit and charging path control unit are realized its function separately;
Voltage detection unit, connect anti-detecting unit and the detected state delay unit inserted, whether be used to detect the charger output voltage greater than predetermined excess pressure protection threshold values, and to adjust its output signal according to testing result be overvoltage condition or normal condition, and output signal sent to the detected state delay unit, when wherein said output signal is normal condition, the detected state delay unit carry out predetermined amount of time to sending the delay operation that this outputs signal to charging path control unit, and output signal is when being overvoltage condition, the detected state delay unit directly sends to output signal charging path control unit, wherein, described predetermined excess pressure protection threshold values is different with the difference of terminal equipment, and for example being provided with and charging normal voltage is that the predetermined excess pressure protection threshold values of the terminal equipment of 5V is 5.5V etc.;
The detected state delay unit, connect anti-detecting unit, voltage detection unit and the charging path control unit inserted, be used for when the voltage detection unit output signal is normal condition, carry out predetermined amount of time to sending the delay operation that this outputs signal to charging path control unit, and the output signal of voltage detection unit is transferred to charging path control unit, when output signal was overvoltage condition, the detected state delay unit directly sent to output signal charging path control unit;
Charging path control unit, connect anti-slotting detecting unit and detected state delay unit Power Management Unit to terminal equipment, be used for output signal according to anti-slotting detecting unit and voltage detection unit, the conducting of control charging path or end, promptly when the anti-signal of inserting detecting unit output for anti-when inserting state or voltage detection unit output signal when being overvoltage condition, control charging path ends, when the anti-signal of inserting detecting unit and voltage detection unit output all is normal condition, the conducting of control charging path.
As shown in Figure 2, the charge protection device according to the present invention, charge protection method of the present invention may further comprise the steps:
Whether step 101: it is anti-inserted to detect charger polarity, if execution in step 103 then, otherwise execution in step 102.
Step 102: whether detect the charger output voltage greater than predetermined excess pressure protection threshold values, if execution in step 103 then, otherwise execution in step 104.
Wherein, described predetermined excess pressure protection threshold value is according to the charging piezoelectric voltage of terminal equipment and different, and for example being provided with and charging normal voltage is that the predetermined excess pressure protection threshold values of the terminal equipment of 5V is 5.5V etc.
Step 103: disconnect the charging path; Continuing execution in step 101 then detects.
If detection by step 101; discovery charger output voltage is protected threshold values greater than predetermined excess pressure; or charger polarity is anti-inserted; then disconnect the charging path; continue the detection of execution in step 101 then; after finding that the correct and charger output voltage of charger polarity is less than predetermined excess pressure protection threshold values, execution in step 104.
Step 104: the delay operation of carrying out scheduled time length for connection charging path;
The purpose of described delay operation is, detect in the step 101 detect charging voltage in the correct and step 102 of polarity and belong to normal range (NR) after, delay operation through certain hour, just the normal state signal with voltage detection unit output is transferred to charging path control unit, prevent that with this demand working charging path from causing the moment overcurrent to burn out terminal equipment, and can eliminate the shake of charger output voltage.
Step 105: connect the charging path, and continue execution in step 102 and detect.
Connect after the charging path, continue to detect the charger output voltage, if the charger output voltage is protected threshold values greater than predetermined excess pressure, the then operation of the open circuit in the execution in step 103.
Each unit for charge protection device of the present invention; can utilize multiple circuit or device to realize; for example voltage detection unit uses the special chip that detects voltage; when the charger output voltage is higher than predetermined excess pressure protection threshold values; export a high level or low level etc.; the circuit diagram of an embodiment of charge protection device of the present invention as shown in Figure 3, wherein
The anti-detecting unit of inserting comprises the first diode D1, and its anode is connected to the charger output, and negative electrode is connected to voltage detection unit, detected state delay unit and charging path control unit.
Voltage detection unit comprises first resistance R 1, second resistance R 2 and the first triode Q1, R1 one end connects the anti-output of inserting detecting unit, it is the negative electrode of D1, the other end connects the end of R2 and the base stage of Q1, R2 one end connects the base stage of R1 and Q1, other end ground connection, the collector electrode of Q1 is connected to the negative electrode of D1, grounded emitter.
The detected state delay unit comprises the 3rd resistance R 3 and first capacitor C 1, and R3 one end connects the negative electrode of D1, the other end connect voltage detection unit output, be the collector electrode of Q1, and connect the end of C1, the other end ground connection of C1.
Charging path control unit comprises the second triode Q2, the 4th resistance R 4, the first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2, wherein, the end of R4 connects the negative electrode of D1, and the other end connects the collector electrode of Q2, and the base stage of Q2 is connected to the output of detected state delay unit, be between C1 and the R3, grounded emitter, the grid of M1 and M2 is connected to the collector electrode of Q2, and the source electrode of M1 is connected to the output of charger, drain electrode is connected to the drain electrode of M2, and the source electrode of M2 is connected to the VCHG pin of the Power Management Unit of terminal equipment.
By above structure as can be known, when charger was instead inserted, D1 oppositely ended, and negative electrode is a low level, causes Q2 to end, and makes 2 metal-oxide-semiconductor M1 and M2 end, and VCHG also is a low level, and the charging path disconnects.
When charger was not instead inserted, the D1 conducting only had the diode current flow pressure drop, negative electrode is output as high level, selects the proportionate relationship of R1 and R2 this moment, makes when charger is output as the normal voltage value, the resulting pressure drop of R2 dividing potential drop is less than the conduction voltage drop of Q1, Q1 ends, the current collection of Q1 high level very then, and when when charger output during greater than the normal voltage value, the resulting pressure drop of R2 dividing potential drop is greater than the conduction voltage drop of Q1, the Q1 conducting, this moment Q1 current collection low level very, for about 0.3V.
When charger was output as the normal voltage value, Q1 ended, and this moment, the negative electrode of D1 charged to C1 by R3, the voltage of C1 increases gradually, when its voltage during, Q2 conducting, cause the process of Q2 conducting to be equivalent to carry out the delay operation of scheduled time length to the charging of C1 greater than 0.7V.
When Q2 ended, the R4 both end voltage was identical, is the charger output voltage, and the source electrode of M1 and M2 and the pressure drop between the grid are 0V, and M1 and M2 end, and this moment, the VCHG pin voltage was 0V, and the Power Management Unit of terminal equipment is not carried out charging operations.
When the Q2 conducting, the source electrode of M1 and M2 and the pressure drop between the grid are the charger output voltage, M1 and M2 conducting, and VCHG pin voltage value also is about the charger output voltage, and Power Management Unit begins to carry out charging operations.
Because the manufacture craft of metal-oxide-semiconductor; then between the drain electrode of M1 and M2 and source electrode, be parallel with a diode respectively; so used two the metal-oxide-semiconductor M1 and the M2 of serial connection mutually in the present embodiment, so that the polarity of charge protector of the present invention and charger output voltage is irrelevant.
The above is preferred embodiment of the present invention only, is not to be used for limiting protection scope of the present invention.Those skilled in that art should be able to associate; utilize different circuit or functional module to realize each unit of charge protection device of the present invention; charge protection device of the present invention has other greater functionality modules; and other charge protection device that utilizes the distortion of the facies type that method and structure of the present invention done and meet architectural feature of the present invention all should belong to protection scope of the present invention.

Claims (10)

1. a charge protection method is characterized in that, this method may further comprise the steps:
Whether A, to detect charger polarity anti-inserted, and whether detect the charger output voltage greater than predetermined excess pressure protection threshold values, if having one in the binomial for being, and execution in step B then, otherwise execution in step C;
B, disconnection charging path finish current flow process;
C, connection charging path.
2. charge protection method according to claim 1 is characterized in that, between steps A and the step C, further comprises, carries out the delay operation for connection charging path of scheduled time length.
3. charge protection method according to claim 1 is characterized in that, after the step B, and the further whether anti-inserted operation of the detection charger polarity among the execution in step A.
4. charge protection method according to claim 1 is characterized in that, after the step C, further detects the charger output voltage among the execution in step A whether greater than the operation of predetermined excess pressure protection threshold values.
5. a charge protection device is characterized in that, described device connects the output of charger and the Power Management Unit of terminal equipment, comprises anti-detecting unit, voltage detection unit and the charging path control unit inserted, wherein,
The anti-detecting unit of inserting, connect charger output and voltage detection unit and charging path control unit, whether be used to detect charger polarity anti-inserted, and adjust its output signal according to testing result and be anti-state or the normal condition of inserting, its output signal is transferred to voltage detection unit and charging path control unit, output signal is when instead inserting state, off voltage detecting unit and charging path control unit;
Voltage detection unit, connect anti-detecting unit and the charging path control unit inserted, be used to detect the charger output voltage whether greater than predetermined excess pressure protection threshold values, and to adjust its output signal according to testing result be overvoltage condition or normal condition, its output signal is transferred to charging path control unit;
Charging path control unit, connect anti-Power Management Unit of inserting detecting unit and voltage detection unit and terminal equipment, be used for output signal according to anti-slotting detecting unit and voltage detection unit, the conducting of control charging path or end, when anti-output signal of inserting detecting unit and voltage detection unit is normal condition, the conducting of control charging path, otherwise control charging path ends.
6. charge protection device according to claim 5; it is characterized in that; described charge protection device also comprises the detected state delay unit; described detected state delay unit is between voltage detection unit and charging path control unit; be used for when the voltage detection unit output signal is normal condition; that carries out scheduled time length outputs signal to the delay operation of charging path control unit to voltage detection unit; when the voltage detection unit output signal was overvoltage condition, directly the output signal with voltage detection unit sent to charging path control unit.
7. charge protection device according to claim 6; it is characterized in that; the described anti-detecting unit of inserting comprises first diode, and its anode is connected to the charger output, and negative electrode is connected to voltage detection unit, detected state delay unit and charging path control unit.
8. charge protection device according to claim 6; it is characterized in that; described voltage detection unit comprises first resistance, second resistance and first triode; first resistance, one end connects the anti-output of inserting detecting unit; the other end connects the base stage of an end and first triode of second resistance, and second resistance, one end connects the base stage of first resistance and first triode, other end ground connection; the collector electrode of first triode is connected to the anti-output of inserting detecting unit, grounded emitter.
9. charge protection device according to claim 6; it is characterized in that; described charging path control unit comprises second triode; the 4th resistance and first metal-oxide-semiconductor and second metal-oxide-semiconductor; wherein; one end of the 4th resistance connects the anti-output of inserting detecting unit; the other end connects the collector electrode of second triode; the base stage of second triode is connected to the output of detected state delay unit; grounded emitter; the grid of first metal-oxide-semiconductor and second metal-oxide-semiconductor is connected to the collector electrode of second triode; the source electrode of first metal-oxide-semiconductor is connected to the output of charger, and drain electrode is connected to the drain electrode of second metal-oxide-semiconductor, and the source electrode of second metal-oxide-semiconductor is connected to the Power Management Unit of terminal equipment.
10. charge protection device according to claim 6; it is characterized in that; described detected state delay unit comprises the 3rd resistance and first electric capacity; the 3rd resistance one end connects the anti-output of inserting detecting unit; the other end connects the output of voltage detection unit; and connect an end of first electric capacity, the other end ground connection of first electric capacity.
CN200710177859XA 2007-11-21 2007-11-21 Charging protection device CN101174770B (en)

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CN101741052A (en) * 2008-11-27 2010-06-16 无锡松下冷机有限公司 Device and method for over-current over-voltage protection
CN102136717A (en) * 2011-03-22 2011-07-27 惠州Tcl移动通信有限公司 Charger and charging protection device
CN102142681A (en) * 2010-12-23 2011-08-03 聚信科技有限公司 Method and device for preventing input reverse-connection damage
CN102842886A (en) * 2011-06-24 2012-12-26 鸿富锦精密工业(深圳)有限公司 Overvoltage protection circuit
CN101552482B (en) * 2008-03-31 2013-05-01 精工电子有限公司 Charge and discharge control circuit and battery device
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CN101741052A (en) * 2008-11-27 2010-06-16 无锡松下冷机有限公司 Device and method for over-current over-voltage protection
CN102142681A (en) * 2010-12-23 2011-08-03 聚信科技有限公司 Method and device for preventing input reverse-connection damage
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CN104037734B (en) * 2013-03-04 2017-04-26 中兴通讯股份有限公司 Charging protection device for intelligent terminal, and intelligent terminal
CN104426145A (en) * 2013-09-09 2015-03-18 海洋王(东莞)照明科技有限公司 Inverse connection prevention circuit and lamp
CN104426145B (en) * 2013-09-09 2018-09-11 海洋王(东莞)照明科技有限公司 Prevent reversed circuit and lamps and lanterns
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CN107580174A (en) * 2017-07-18 2018-01-12 西安电子科技大学 Multi-function data acquisition card

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