CN105449803A - Overvoltage protection circuit of charger and control method of overvoltage protection circuit - Google Patents
Overvoltage protection circuit of charger and control method of overvoltage protection circuit Download PDFInfo
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- CN105449803A CN105449803A CN201610047439.9A CN201610047439A CN105449803A CN 105449803 A CN105449803 A CN 105449803A CN 201610047439 A CN201610047439 A CN 201610047439A CN 105449803 A CN105449803 A CN 105449803A
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- 238000002955 isolation Methods 0.000 claims abstract description 15
- 230000005540 biological transmission Effects 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 14
- 230000006837 decompression Effects 0.000 claims description 13
- 230000001681 protective effect Effects 0.000 claims description 7
- 230000003321 amplification Effects 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract 1
- 238000007599 discharging Methods 0.000 abstract 1
- 230000005611 electricity Effects 0.000 description 9
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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Classifications
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- H02J7/027—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
Abstract
The invention discloses an overvoltage protection circuit of a charger. The overvoltage protection circuit of the charger comprises a detecting unit and a charging unit, the detecting unit is connected to an AC-N line through a first isolation resistor and connected to an AC-L line through a second isolation resistor, the detecting unit comprises a voltage signal line and a frequency signal line which are connected to the same central processing unit, the AC-N line is electrically connected with a partial pressure current limiting unit, the AC-L line is switched and conducted at one end of the partial pressure current limiting unit through a relay K1 which is used for switching the line according to a feedback signal, the relay K1 is electrically connected with the central processing unit, and the partial pressure current limiting unit is connected with the discharging unit. The invention further discloses a control method of the overvoltage protection circuit of the charger. The method comprises the steps of equipment starting, circuit detection, mode selection and voltage transmission. The overvoltage protection circuit can effectively ensure that a machine works normally, and by means of the control method of the overvoltage protection circuit, the service life of the charger is effectively guaranteed.
Description
Technical field
The present invention relates to the technical field of charger, espespecially a kind of overvoltage crowbar of charger and control method thereof.
Background technology
High Altitude Platform car is a kind of aerial work platform equipment be usually used on building site, and it is provided convenience for workmen's work high above the ground, is arranged on the charger on High Altitude Platform car, is mainly used to as the charging of High Altitude Platform car.
At present, in actual job, the electrical network majority at building site initial stage is temporary guy, on building site, general use is all three-phase electricity leakage switch or distribution box, by workman's wiring voluntarily, and building site to be all under normal circumstances single-phase electricity equipment and three-phase electricity equipment be jointly exists, but, a lot of workman layman, if what receive is a live wire and a ground wire, that is exactly single-phase electricity, have no problem, if but misconnection two live wires, that is exactly the voltage of 380V, power socket does not distinguish again, workman is when using equipment (charger as on High Altitude Platform car), be easy to misplug on the circuit of 380V, the actual use voltage of equipment is made to exceed the rated voltage of equipment itself, cause device damage.
Summary of the invention
The object of the invention is to overcome weak point of the prior art and the overvoltage crowbar that a kind of charger is provided; its circuit can effectively prevent relay contact sticky dead; prevent the sparking of access AC plug; guarantee that charger is under any environment of civil power; can normally work, even if when inputting three-phase electricity, machine is not also damaged; its control method effectively can protect the overtension avoiding inputting charhing unit, effectively ensure that the useful life of charger.
For achieving the above object, the present invention adopts following technical scheme:
A kind of overvoltage crowbar of charger, comprise detecting unit and charhing unit, described detecting unit to be connected on an AC-N line by one first isolation resistance and to be connected on an AC-L line by one second isolation resistance, this detecting unit includes voltage signal circuit and frequency signal circuit, this voltage signal circuit and frequency signal circuit are connected on same central processing unit, this AC-N line and a dividing potential drop flow-restriction are electrically connected, this AC-L line passes through a relay (K1) in dividing potential drop flow-restriction one end switched conductive, this relay (K1) is in order to the signal switching circuit according to feedback, this relay (K1) and central processing unit are electrically connected, this dividing potential drop flow-restriction is connected with charhing unit.
Described first isolation resistance is by resistance (R11, R12, R13, R14, R15) sequential series forms, this resistance (R11) one end is connected on AC-N line, this resistance (R15) one end and a resistance (R2) in parallel, this resistance (R15) is connected on detecting unit with the link of resistance (R2), described second isolation resistance is by resistance (R16, R17, R18, R19, R20) sequential series forms, this resistance (R16) one end is connected on AC-L line, this resistance (R20) one end resistance (R35) in parallel, this resistance (R20) is connected on detecting unit with the link of resistance (R35), this resistance (R2) is connected mutually with resistance (R35).
Amplifier (U2A) and amplifier (U3A) is included in the voltage signal circuit of described detecting unit, the pin 3 of this amplifier (U2A) is connected with resistance (R2) by a resistance (R25), the resistance (R29) of a ground connection in parallel between the pin 3 of this amplifier (U2A) and resistance (R25), the pin 2 of this amplifier (U2A) is connected with resistance (R35) by a resistance (R28), the pin 1 of this amplifier (U2A) is connected with the pin 3 of amplifier (U3A) by a resistance (R26), an electric capacity (C1) in parallel between the pin 3 of this resistance (R26) and amplifier (U3A), an also resistance (R31) in parallel between the pin 1 of this amplifier (U2A) and pin 2, the pin 2 of this amplifier (U3A) connects a resistance (R24), the resistance (R32) of this resistance (R24) and a ground connection that the link of the pin 2 of amplifier (U3A) is connected, at the electric capacity (C9) of the pin 2 also ground connection in parallel of amplifier (U3A), the pin 1 of this amplifier (U3A) is connected on central processing unit by a resistance (R27), this resistance (R27) and an order resistance (R30) in parallel and an electric capacity (C8) on the link of central processing unit, this resistance (R30) and electric capacity (C8) ground connection respectively.
Amplifier (U2B) and amplifier (U3B) is included in the frequency signal circuit of described detecting unit, the pin 6 of this amplifier (U2B) is connected with resistance (R2) by a resistance (R36), the pin 2 of this amplifier (U2B) is connected with resistance (R35) by a resistance (R38), the resistance (R41) of a ground connection in parallel between the pin 2 of this resistance (R38) and amplifier (U2B), a resistance (R33) in parallel between the pin 6 of this amplifier (U2B) and pin 7, the pin 7 of this amplifier (U2B) is connected in parallel on electric capacity (C1) by a resistance (R37), this electric capacity (C1) is also parallel with resistance (R40), this resistance (R40) is connected by the pin 5 of a resistance (R39) with amplifier (U3B), the electric capacity (C2) of a ground connection in parallel between the pin 5 of this resistance (R39) and amplifier (U3B), an electric capacity (C10) in parallel between this resistance (R39) and resistance (R40), this electric capacity (C10) is connected on central processing unit by a resistance (R34), the pin 6 of this amplifier (U3B) and pin 7 are connected to electric capacity (C10) and resistance (R34) jointly, the electric capacity (C11) of this resistance (R34) ground connection in parallel with between central processing unit.
Described dividing potential drop flow-restriction includes circuit 3 and circuit 5, and described relay (K1) switched conductive between circuit 3 and circuit 5, this circuit 3 is connected directly between on charhing unit.
Described circuit 5 comprises resistance (R1), is parallel to the decompression capacitor (C15) on resistance (R1) and is jointly parallel to decompression capacitor (C15) to be gone up and the resistance (R22, R23) of series connection mutually, in this resistance (R23) piezo-resistance (MOV1) in parallel with between AC-N line, described circuit 3 is connected to the link of piezo-resistance (MOV1) and resistance (R23), the link of this circuit 3 and resistance (R23) and AC-N line parallel one electric capacity (C5), this electric capacity (C5) two ends are connected with charhing unit respectively.
An overvoltage protection control methods for charger, is provided with protective circuit in this charger, and described protective circuit is above-mentioned overvoltage crowbar, and the overvoltage protection control methods step of this charger is as follows:
1) opening of device: the equipment connection situation detecting charger, determines to connect normally, charger is accessed civil power, opens charger;
2) electric circuit inspection: the charger of step 1) by the voltage signal circuit and the civil power of frequency signal circuit to access forming detecting unit carry out amplification ratio comparatively after, be converted to the readable voltage signal of central processing unit and frequency signal;
3) model selection: central processing unit is according to step 2) voltage signal and frequency signal decision circuitry situation, control relay (K1) switches between the circuit 3 and circuit 5 of dividing potential drop flow-restriction, under selecting to be applicable to current civil power, the circuit that applicable charger normally uses;
4) voltage transmission: when central processing unit judges morning session electrical anomaly, central processing unit can send switching drive singal to relay (K1), control relay (K1) is switched to circuit 5 and reports city's electrical anomaly, after voltage being carried out dividing potential drop by the decompression capacitor (C15) in electric capacity (C5) and dividing potential drop flow-restriction, to the line powering of charhing unit simultaneously; Before CPU judges, civil power is normal, and relay is switched to circuit 3, for the circuit of charger is directly powered.
Beneficial effect of the present invention is: its overvoltage crowbar is detected by the AC of detecting unit to access, and convert voltage signal to and frequency signal flows to central processing unit, this central processing unit is according to the signal received, drive relay circuit switched, and coordinate dividing potential drop flow-restriction, when city's electrical anomaly, prevent relay contact sticky dead, prevent the sparking of access AC plug, voltage is divided equally by the decompression capacitor C15 in X electric capacity and dividing potential drop flow-restriction, thus guarantee that charger is under any environment of civil power, can normally work, even if when inputting three-phase electricity, machine is not also damaged, its control method effectively can protect the overtension avoiding inputting charhing unit, effectively ensure that the useful life of charger.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the dividing potential drop flow-restriction of the present invention.
Fig. 2 is the circuit diagram of the detecting unit of the present invention.
Fig. 3 is way circuit figure of the present invention.
Embodiment
Below in conjunction with Figure of description, the invention will be further described:
As Figure 1-3, the present invention is about a kind of overvoltage crowbar of charger, comprise detecting unit and charhing unit, detecting unit to be connected on an AC-N line by one first isolation resistance and to be connected on an AC-L line by one second isolation resistance, this detecting unit includes voltage signal circuit and frequency signal circuit, this voltage signal circuit and frequency signal circuit are connected on same central processing unit, this AC-N line and a dividing potential drop flow-restriction are electrically connected, this AC-L line passes through a relay K 1 in dividing potential drop flow-restriction one end switched conductive, this relay K 1 is in order to the signal switching circuit according to feedback, this relay K 1 is electrically connected with central processing unit, this dividing potential drop flow-restriction is connected with charhing unit, wherein, the use of isolation resistance, can effectively prevent from influencing each other between two signal source amplifier outs, injurious effects are reduced greatly, be conducive to the steady operation of circuit.
As shown in Figure 1, first isolation resistance is by resistance R11, R12, R13, R14, R15 sequential series forms, this resistance R11 one end is connected on AC-N line, this resistance R15 one end and a resistance R2 in parallel, the link of this resistance R15 and resistance R2 is connected on detecting unit, second isolation resistance is by resistance R16, R17, R18, R19, R20 sequential series forms, this resistance R16 one end is connected on AC-L line, this resistance R20 one end resistance R35 in parallel, the link of this resistance R20 and resistance R35 is connected on detecting unit, this resistance R2 connects mutually with resistance R35.
As Fig. 1, shown in 3, amplifier U2A and amplifier U3A is included in the voltage signal circuit of detecting unit, the pin 3 of this amplifier U2A is connected with resistance R2 by a resistance R25, the resistance R29 of a ground connection in parallel between the pin 3 of this amplifier U2A and resistance R25, the pin 2 of this amplifier U2A is connected with resistance R35 by a resistance R28, the pin 1 of this amplifier U2A is connected with the pin 3 of amplifier U3A by a resistance R26, an electric capacity C1 in parallel between the pin 3 of this resistance R26 and amplifier U3A, an also resistance R31 in parallel between the pin 1 of this amplifier U2A and pin 2, the pin 2 of this amplifier U3A connects a resistance R24, the resistance R32 of this resistance R24 and a ground connection that the link of the pin 2 of amplifier U3A is connected, at the electric capacity C9 of the pin 2 also ground connection in parallel of amplifier U3A, the pin 1 of this amplifier U3A is connected on central processing unit by a resistance R27, an a this resistance R27 and order resistance R30 in parallel and electric capacity C8 on the link of central processing unit, this resistance R30 and electric capacity C8 is ground connection respectively.
As Fig. 1, shown in 3, amplifier U2B and amplifier U3B is included in the frequency signal circuit of detecting unit, the pin 6 of this amplifier U2B is connected with resistance R2 by a resistance R36, the pin 2 of this amplifier U2B is connected with resistance R35 by a resistance R38, the resistance R41 of a ground connection in parallel between the pin 2 of this resistance R38 and amplifier U2B, a resistance R33 in parallel between the pin 6 of this amplifier U2B and pin 7, the pin 7 of this amplifier U2B is connected in parallel on electric capacity C1 by a resistance R37, this electric capacity C1 is also parallel with resistance R40, this resistance R40 is connected with the pin 5 of amplifier U3B by a resistance R39, the electric capacity C2 of a ground connection in parallel between the pin 5 of this resistance R39 and amplifier U3B, an electric capacity C10 in parallel between this resistance R39 and resistance R40, this electric capacity C10 is connected on central processing unit by a resistance R34, the pin 6 of this amplifier U3B and pin 7 are connected to electric capacity C10 and resistance R34 jointly, the electric capacity C11 of this resistance R34 ground connection in parallel with between central processing unit.
Wherein, amplifier U2A, U2B preferably adopts the dual operational amplifier of LM358 respectively; Amplifier U3A, U3B preferably adopt the dual operational amplifier of LM2904DR respectively; Resistance R25, R28, R36, R38 preferably adopt 24K9 resistance respectively, and resistance R29, R31, R33, R41 preferably adopt 3M01 resistance respectively; Resistance R26, R37 preferably adopt 10K resistance respectively; Resistance R39, R40 preferably adopt 49K9 resistance respectively, and resistance R27, R32 preferably adopt 2K resistance respectively; Resistance R30, R34 preferably adopt 1K resistance respectively; Resistance R24 preferably adopts 49K99 resistance respectively; Resistance R2, R35 preferably adopt 2K2 resistance respectively; Resistance R22, R23 preferably adopt 449K/1206 resistance respectively; Piezo-resistance MOV1 is the resistance of 20D471; Electric capacity C8, C9, C12 preferably adopt 102 electric capacity respectively; Electric capacity C11 preferably adopts 104 electric capacity; Electric capacity C13 preferably adopts 105 electric capacity; Electric capacity C10 preferably adopts 106 electric capacity.
As shown in Figure 1, 2, dividing potential drop flow-restriction includes circuit 3 and circuit 5, and described relay K 1 switched conductive between circuit 3 and circuit 5, this circuit 3 is connected directly between on charhing unit.
As Fig. 1, shown in 2, circuit 5 comprises resistance R1, be parallel to the decompression capacitor C15 on resistance R1 and be jointly parallel on decompression capacitor C15 and the resistance R22 of series connection mutually, R23, in this resistance R23 piezo-resistance MOV1 in parallel with between AC-N line, circuit 3 is connected to the link of piezo-resistance MOV1 and resistance R23, the link of this circuit 3 and resistance R23 and AC-N line parallel one electric capacity C5, this electric capacity C5 two ends are connected with charhing unit respectively, preferably, this decompression capacitor C15 adopts 3u3/305V electric capacity, this electric capacity C15 is 3.3U, with X electric capacity (i.e. electric capacity C5/C7, this electric capacity C5 and C7 adds up as 3U, this electric capacity C5 and C7 preferably adopts 1U5/305VAC electric capacity respectively) the most close, wherein, the use of piezo-resistance MOV1, the effect of " safety valve " is played in circuit, the abnormal overvoltage often occurred in circuit can be suppressed, protective circuit is from superpotential infringement.
During use, civil power is entered by the P2 end of AC-N line and the P4 termination of AC-L line, wherein, AC-L line is provided with fuse F1 near its P4 end place, this fuse F1 is F15A/250V fuse, amplification ratio is comparatively and convert voltage signal and frequency signal to respectively by the voltage signal circuit of detecting unit and frequency signal circuit for civil power, flow to central processing unit, according to the voltage signal received and frequency signal, central processing unit judges that whether civil power is abnormal, when civil power is normal, the drive singal of relay K 1 beaten by central processing unit before the zero point of civil power, relay K 1 is made to be switched to the circuit 3 of dividing potential drop flow-restriction, make the contact of relay K 1 closed at electrical zero place of city, to prevent relay K 1 contact sticky dead, when city's electrical anomaly, as AC is input as three-phase electricity, central processing unit sends drive singal, relay K 1 is made to switch to the circuit 5 of dividing potential drop flow-restriction, and report city electrical anomaly Fault, the voltage of AC end input is through decompression capacitor C15 and X condenser paper component voltage, to the line powering of accessory power supply, with the bulky capacitor current-limiting charge exported PFC, such as, when the voltage inputted is the three-phase electricity of 380V, decompression capacitor C15 and X electric capacity can carry out dividing potential drop to the voltage of input, the virtual voltage being transported to charhing unit is like this about 180V, to prevent the sparking of access AC plug, thus guarantee when inputting three-phase electricity, machine is not damaged.
Present invention further teaches a kind of overvoltage protection control methods of charger, be provided with protective circuit in this charger, described protective circuit is above-mentioned overvoltage crowbar, and the overvoltage protection control methods step of this charger is as follows:
1) opening of device: the equipment connection situation detecting charger, determines to connect normally, charger is accessed civil power, opens charger;
2) electric circuit inspection: the charger of step 1) by the voltage signal circuit and the civil power of frequency signal circuit to access forming detecting unit carry out amplification ratio comparatively after, be converted to the readable voltage signal of central processing unit and frequency signal;
3) model selection: central processing unit is according to step 2) voltage signal and frequency signal decision circuitry situation, control relay K1 switches between the circuit 3 and circuit 5 of dividing potential drop flow-restriction, under selecting to be applicable to current civil power, the circuit that applicable charger normally uses;
4) voltage transmission: when central processing unit judges morning session electrical anomaly, central processing unit can send switching drive singal to relay K 1, control relay K1 is switched to circuit 5 and reports city's electrical anomaly, after voltage being carried out dividing potential drop by the decompression capacitor C15 in electric capacity C5 and dividing potential drop flow-restriction, to the line powering of charhing unit simultaneously; Before CPU judges, civil power is normal, and relay is switched to circuit 3, for the circuit of charger is directly powered.
The above is only to preferred embodiment of the present invention; not scope of the present invention is limited; therefore under not departing from the present invention and designing the prerequisite of spirit; the common engineers and technicians in this area change or decoration the equivalence that structure of the present invention, feature and principle are done, and all should fall in the protection range of the present patent application patent.
Claims (7)
1. the overvoltage crowbar of a charger, comprise detecting unit and charhing unit, it is characterized in that: described detecting unit to be connected on an AC-N line by one first isolation resistance and to be connected on an AC-L line by one second isolation resistance, this detecting unit includes voltage signal circuit and frequency signal circuit, this voltage signal circuit and frequency signal circuit are connected on same central processing unit, this AC-N line and a dividing potential drop flow-restriction are electrically connected, this AC-L line passes through a relay (K1) in dividing potential drop flow-restriction one end switched conductive, this relay (K1) is in order to the signal switching circuit according to feedback, this relay (K1) and central processing unit are electrically connected, this dividing potential drop flow-restriction is connected with charhing unit.
2. the overvoltage crowbar of charger according to claim 1, it is characterized in that: described first isolation resistance is by resistance (R11, R12, R13, R14, R15) sequential series forms, this resistance (R11) one end is connected on AC-N line, this resistance (R15) one end and a resistance (R2) in parallel, this resistance (R15) is connected on detecting unit with the link of resistance (R2), described second isolation resistance is by resistance (R16, R17, R18, R19, R20) sequential series forms, this resistance (R16) one end is connected on AC-L line, this resistance (R20) one end resistance (R35) in parallel, this resistance (R20) is connected on detecting unit with the link of resistance (R35), this resistance (R2) is connected mutually with resistance (R35).
3. the overvoltage crowbar of charger according to claim 2, it is characterized in that: in the voltage signal circuit of described detecting unit, include amplifier (U2A) and amplifier (U3A), the pin 3 of this amplifier (U2A) is connected with resistance (R2) by a resistance (R25), the resistance (R29) of a ground connection in parallel between the pin 3 of this amplifier (U2A) and resistance (R25), the pin 2 of this amplifier (U2A) is connected with resistance (R35) by a resistance (R28), the pin 1 of this amplifier (U2A) is connected with the pin 3 of amplifier (U3A) by a resistance (R26), an electric capacity (C1) in parallel between the pin 3 of this resistance (R26) and amplifier (U3A), an also resistance (R31) in parallel between the pin 1 of this amplifier (U2A) and pin 2, the pin 2 of this amplifier (U3A) connects a resistance (R24), the resistance (R32) of this resistance (R24) and a ground connection that the link of the pin 2 of amplifier (U3A) is connected, at the electric capacity (C9) of the pin 2 also ground connection in parallel of amplifier (U3A), the pin 1 of this amplifier (U3A) is connected on central processing unit by a resistance (R27), this resistance (R27) and an order resistance (R30) in parallel and an electric capacity (C8) on the link of central processing unit, this resistance (R30) and electric capacity (C8) ground connection respectively.
4. the overvoltage crowbar of charger according to claim 2, it is characterized in that: in the frequency signal circuit of described detecting unit, include amplifier (U2B) and amplifier (U3B), the pin 6 of this amplifier (U2B) is connected with resistance (R2) by a resistance (R36), the pin 2 of this amplifier (U2B) is connected with resistance (R35) by a resistance (R38), the resistance (R41) of a ground connection in parallel between the pin 2 of this resistance (R38) and amplifier (U2B), a resistance (R33) in parallel between the pin 6 of this amplifier (U2B) and pin 7, the pin 7 of this amplifier (U2B) is connected in parallel on electric capacity (C1) by a resistance (R37), this electric capacity (C1) is also parallel with resistance (R40), this resistance (R40) is connected by the pin 5 of a resistance (R39) with amplifier (U3B), the electric capacity (C2) of a ground connection in parallel between the pin 5 of this resistance (R39) and amplifier (U3B), an electric capacity (C10) in parallel between this resistance (R39) and resistance (R40), this electric capacity (C10) is connected on central processing unit by a resistance (R34), the pin 6 of this amplifier (U3B) and pin 7 are connected to electric capacity (C10) and resistance (R34) jointly, the electric capacity (C11) of this resistance (R34) ground connection in parallel with between central processing unit.
5. the overvoltage crowbar of charger according to claim 1; it is characterized in that: described dividing potential drop flow-restriction includes circuit 3 and circuit 5; described relay (K1) switched conductive between circuit 3 and circuit 5, this circuit 3 is connected directly between on charhing unit.
6. the overvoltage crowbar of charger according to claim 5, it is characterized in that: described circuit 5 comprises resistance (R1), be parallel to the decompression capacitor (C15) on resistance (R1) and be jointly parallel to decompression capacitor (C15) and go up and the resistance (R22 of series connection mutually, R23), in this resistance (R23) piezo-resistance (MOV1) in parallel with between AC-N line, described circuit 3 is connected to the link of piezo-resistance (MOV1) and resistance (R23), the link of this circuit 3 and resistance (R23) and AC-N line parallel one electric capacity (C5), this electric capacity (C5) two ends are connected with charhing unit respectively.
7. an overvoltage protection control methods for charger, is provided with protective circuit in this charger, it is characterized in that, described protective circuit is the overvoltage crowbar described in any one of claim 1-6, and the overvoltage protection control methods step of this charger is as follows:
1) opening of device: the equipment connection situation detecting charger, determines to connect normally, charger is accessed civil power, opens charger;
2) electric circuit inspection: the charger of step 1) by the voltage signal circuit and the civil power of frequency signal circuit to access forming detecting unit carry out amplification ratio comparatively after, be converted to the readable voltage signal of central processing unit and frequency signal;
3) model selection: central processing unit is according to step 2) voltage signal and frequency signal decision circuitry situation, control relay (K1) switches between the circuit 3 and circuit 5 of dividing potential drop flow-restriction, under selecting to be applicable to current civil power, the circuit that applicable charger normally uses;
4) voltage transmission: when central processing unit judges morning session electrical anomaly, central processing unit can send switching drive singal to relay (K1), control relay (K1) is switched to circuit 5 and reports city's electrical anomaly, after voltage being carried out dividing potential drop by the decompression capacitor (C15) in electric capacity (C5) and dividing potential drop flow-restriction, to the line powering of charhing unit simultaneously; Before CPU judges, civil power is normal, and relay is switched to circuit 3, for the circuit of charger is directly powered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610047439.9A CN105449803B (en) | 2016-01-25 | 2016-01-25 | The overvoltage crowbar and its control method of charger |
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| CN201610047439.9A CN105449803B (en) | 2016-01-25 | 2016-01-25 | The overvoltage crowbar and its control method of charger |
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| CN105449803A true CN105449803A (en) | 2016-03-30 |
| CN105449803B CN105449803B (en) | 2018-10-09 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105939094A (en) * | 2016-06-27 | 2016-09-14 | 杨霜 | Power converter and control method thereof |
| CN108683159A (en) * | 2018-04-27 | 2018-10-19 | 东莞市熠源电子科技有限公司 | The power supply protection circuit and its control method of anti-abrupt voltage wave |
| CN112039324A (en) * | 2020-07-31 | 2020-12-04 | 珠海格力电器股份有限公司 | Overvoltage protection circuit, method and device, power supply equipment and computer readable medium |
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|---|---|---|---|---|
| CN101082439A (en) * | 2006-05-30 | 2007-12-05 | 海尔集团公司 | Air conditioner soft start-up control device |
| KR20100136769A (en) * | 2009-06-19 | 2010-12-29 | 최형오 | Charging circuit of battery for forklift truck |
| CN103401215A (en) * | 2013-07-31 | 2013-11-20 | 深圳市金立通信设备有限公司 | Over-voltage and under-voltage protection circuit, protection socket and terminal |
| CN205355900U (en) * | 2016-01-25 | 2016-06-29 | 东莞龙升电子有限公司 | Overvoltage crowbar of charger |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105939094A (en) * | 2016-06-27 | 2016-09-14 | 杨霜 | Power converter and control method thereof |
| CN108683159A (en) * | 2018-04-27 | 2018-10-19 | 东莞市熠源电子科技有限公司 | The power supply protection circuit and its control method of anti-abrupt voltage wave |
| CN112039324A (en) * | 2020-07-31 | 2020-12-04 | 珠海格力电器股份有限公司 | Overvoltage protection circuit, method and device, power supply equipment and computer readable medium |
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|---|---|
| CN105449803B (en) | 2018-10-09 |
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