CN105635377A - Broadcast phone based on power supply effective management - Google Patents

Broadcast phone based on power supply effective management Download PDF

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Publication number
CN105635377A
CN105635377A CN201510969183.2A CN201510969183A CN105635377A CN 105635377 A CN105635377 A CN 105635377A CN 201510969183 A CN201510969183 A CN 201510969183A CN 105635377 A CN105635377 A CN 105635377A
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CN
China
Prior art keywords
circuit
module
power supply
battery
audion
Prior art date
Application number
CN201510969183.2A
Other languages
Chinese (zh)
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CN105635377B (en
Inventor
权循忠
吴琰
廖晓纬
Original Assignee
淮南师范学院
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Priority to CN201510969183.2A priority Critical patent/CN105635377B/en
Publication of CN105635377A publication Critical patent/CN105635377A/en
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Publication of CN105635377B publication Critical patent/CN105635377B/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M1/00Substation equipment, e.g. for use by subscribers; Analogous equipment at exchanges
    • H04M1/02Constructional features of telephone sets
    • H04M1/18Telephone sets modified for use in ships, mines, or other places exposed to adverse environment
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0026Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially using safety or protection circuits, e.g. overcharge/discharge disconnection
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/36Arrangements using end-cell switching
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/061Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads

Abstract

The invention discloses a broadcast phone based on power supply effective management, belongs to the mining communication electronic equipment field. The broadcast phone comprises a power supply management module, a central processing unit, a lockout circuit module, a voice ring tone transmitting circuit module, a voice ring tone receiving circuit module and a battery charge-discharge management module; the battery charge-discharge management module comprises a charge voltage reduction module, a circuit signal collection module and a battery assembly; two battery modules are contained in the battery assembly; the power supply management module comprises three power supply circuits: a voltage reduction power supply circuit, a battery assembly power supply circuit and an emergency external power supply circuit; power is supplied to the lockout circuit module by the power supply management module; and power is directly supplied to the voice ring tone transmitting circuit module and the voice ring tone receiving circuit module by the battery assembly. According to the broadcast phone of the invention, the power supply management mode is efficient and flexible; the battery can be charged and discharged fully; and the problem of short service life resulted from the battery nickel hydride effect is solved.

Description

A kind of expansion telephone call screener effectively managed based on power supply

Technical field

The invention belongs to mining communication electronic device field, more particularly, it relates to a kind of expansion telephone call screener effectively managed based on power supply.

Background technology

Having the equipment motor of substantial amounts under mine, motor start-up procedure generally requires early warning, and motor is under running into emergency episode situation, it is necessary to signal transmits. Expanding telephone call screener is that communication, signal contact, sound and light alarm and jerk blocking device are broadcast in a kind of Mine-used I. S expansion, it is adaptable to underground coal mine has the environment of gas, coal dust explosion hazard. It can from becoming expansion to broadcast communication and sending dotter signal contacted system, it is possible to accepts external control signal, can send sound and light alarm signal, starts advance notice for equipment or report to the police.

Expand telephone call screener effect in Coal Mine underground equipment motor automated system particularly significant, but current existing expansion telephone call screener power supply is single, if abnormal conditions occur, power-off, expands telephone call screener and just cannot effectively the run signal of equipment motor be transferred out.

Through retrieval, the patent No.: 201120577521.5, the applying date: on December 31st, 2011, invention and created name: the hands-free full duplex hands free telephone of Mine-used I. S band. Expansion telephone call screener in this patent also has backup battery except external power supply, more than when can guarantee that after external power supply power-off that hands free telephone normal operation 2 is little. In this patent, common external power supply transformation efficiency is low, and battery is intended only as stand-by power supply, and power management is not efficient. And prior art expands in telephone call screener general equipped with a cell panel or a set of set of cells, long-term insufficient cycle charging electric discharge, the memory effect that Ni-MH battery carries greatly reduces the life-span of battery.

Summary of the invention

1. invention to solve the technical problem that

A kind of expansion telephone call screener effectively managed based on power supply of the present invention, adopts efficient power management, and the voltage energy of acquisition is few, adopts three kinds of power supplys to select, and flexibility ratio is high, system adaptability to changes is good. Adopting groundwork power supply to power, battery supply is standby, reasonable distribution, is effectively improved energy conservation efficiency, and when overload, the situation such as abnormal occur, simply minor loop disconnects, and expands telephone call screener main road and keeps long-time uninterrupted power supply. Adopting double cell module for power supply, control to make a charging battery module by measure loop and central processing unit, another block battery module discharges, it is ensured that battery can discharge and recharge fully, solve the life-span of battery ni-mh effect belt short and small problem.

2. technical scheme

A kind of expansion telephone call screener effectively managed based on power supply of the present invention includes power management module, central processing unit, exclusive circuit module, voice tone telecommunication circuit module and voice tone PAC circuit module, it is characterized in that: also include battery charging and discharging management module, described battery charging and discharging management module includes charging voltage reduction module, circuit signal acquisition module and battery component, comprises two battery modules in described battery component; Described power management module includes 3 power supplys provides circuit: manages the voltage dropping power supply circuit of the voltage reduction module that charges in module from battery charging and discharging, manages the battery component power circuit of module and emergent external power source circuit from battery charging and discharging; Described battery charging and discharging management module electrically connects with central processing unit, and central processing unit receives the voltage and current signal of circuit signal acquisition module and inputs blood pressure lowering charging signals to charging voltage reduction module and provide battery module switching signal to battery component; Described exclusive circuit module is provided power supply by power management module and electrically connects with central processing unit, described voice tone telecommunication circuit module, voice tone PAC circuit module are directly powered by battery component and electrically connect with central processing unit, and described voice tone telecommunication circuit module electrically connects with described voice tone PAC circuit module.

As a further improvement on the present invention, described charging voltage reduction module includes audion Q18, charging current protection circuit and decompression tube Q3, the input that base stage is buck signal of described audion Q18, the input of this buck signal accesses central processing unit, the collector and emitter of audion Q18 passes into charging current protection circuit loop, charging current protection circuit is connected with colelctor electrode with the base stage of decompression tube Q3, the emitter stage of described decompression tube Q3 is divided into two-way: a road output buck power supply, one road is provided with the combination of circuit signal acquisition module, then access the set of cells charging end of battery component, described circuit signal acquisition module is connected with central processing unit, and the battery charge collected and battery charging voltage input central processing unit and the battery charge input charging current protection circuit that circuit signal acquisition module will collect, the battery module port switching of described battery component electrically connects with central processing unit.

As a further improvement on the present invention, described power management module includes isolation filter module, is used for processing+18V alternating current, flows into battery charging and discharging module or provides emergent external power source; Article three, power supply provides circuit, inputs three kinds of different electrical power modes; Voltage conversion chip, for being converted to+5V intrinsic safety electric source by above-mentioned three kinds of input powers.

As a further improvement on the present invention, described emergent external power source circuit includes starting current protection circuit, for controlling the audion Q10 that emergent external power source circuit turns off or opens, the biasing resistor R30 of audion Q10, the audion Q9 of grounded emitter, and it is serially connected with the dropping resistor R78 between audion Q10 base stage and audion Q9 colelctor electrode, wherein, the colelctor electrode of audion Q10, the base stage of audion Q9 all protects circuit to electrically connect with starting current, biasing resistor R30 connects with dropping resistor R78, the emitter stage of audion Q10 accesses voltage conversion chip, described voltage dropping power supply circuit and battery component power circuit are divided into two-way: voltage conversion chip is accessed on a road, and another road electrically connects with the base stage of audion Q9.

As a further improvement on the present invention, also including sending dotter signal selects switch, described sending dotter signal to select switch to electrically connect with central processing unit, voice tone telecommunication circuit module; Described sending dotter signal selects switch to be provided power supply by power management module.

As a further improvement on the present invention, described voice tone telecommunication circuit module includes DAB and produces circuit, and described voice tone PAC circuit module includes digital power amplifying circuit.

As a further improvement on the present invention, also including LED light, described LED light is connected with central processing unit, and described LED light is directly powered by battery component.

3. beneficial effect

Adopt technical scheme provided by the invention, compared with prior art, there is following remarkable result:

(1) a kind of expansion telephone call screener effectively managed based on power supply of the present invention, two battery modules are included in battery component, battery charging is controlled according to the voltage and current signal of charging circuit by central processing unit, one charging battery module, another battery module discharges, it is always ensured that two pieces of batteries can fully discharge and recharge, overcome and existing expansion telephone call screener only has a long-term non-abundant discharge and recharge of battery thus the short problem of the battery life that causes because of the ni-mh effect of battery, effectively by 3 months lifes of general battery to more than a year.

(2) a kind of expansion telephone call screener effectively managed based on power supply of the present invention, the power supply that power management module provides is adopted to provide power supply for main performance loop, battery component provides standby power for expanding telephone call screener, under the abnormal conditions such as overload, simply minor loop disconnects, and expands telephone call screener major loop and keeps long-time uninterrupted power supply.

(3) a kind of expansion telephone call screener effectively managed based on power supply of the present invention, power management module adopts 3 kinds of power supplys to power according to primary and secondary, and motility is high, system adaptability to changes is good.

(4) a kind of expansion telephone call screener effectively managed based on power supply of the present invention, groundwork power supply in power management module is by reduction voltage loop supply of charging, what adopt is the pressure drop mode conversion gained that charges efficiently, because efficiency is high, thus the little energy captured by main circuit voltage and comparatively efficient.

(5) a kind of expansion telephone call screener effectively managed based on power supply of the present invention; the audion Q9 adopted in power management module acts not only as the circuit protecting switch of emergent external power source circuit, it is also possible to as the selection switch of battery component power circuit, charging voltage dropping power supply circuit.

(6) a kind of expansion telephone call screener effectively managed based on power supply of the present invention, battery charging and discharging management inside modules power circuit is reasonable in design, it is possible to effectively control the switching of battery module according to the voltage x current of charging circuit.

(7) a kind of expansion telephone call screener effectively managed based on power supply of the present invention, Modular circuit design is reasonable, and simple in circuits effectively reduces cost, it is simple to promote the use of.

Accompanying drawing explanation

Fig. 1Circuit module for expanding telephone call screener in the present invention is illustratedFigure;

Fig. 2For battery charging and discharging management modular circuit in the present inventionFigure;

Fig. 3For power management module circuit in the present inventionFigure;

Fig. 4 is the constitutional diagram of battery charging and discharging management circuit and electric power management circuit in the present invention.

Detailed description of the invention

For further appreciating that present disclosure, in conjunction withAccompanying drawingAnd embodiment the present invention is described in detail.

Embodiment 1

Such as Fig. 1Shown in, a kind of expansion telephone call screener effectively managed based on power supply of the present embodiment, manages module, power management module, central processing unit, exclusive circuit module, voice tone telecommunication circuit module, voice tone PAC circuit module, sending dotter signal selection switch and LED light including battery charging and discharging. Described battery charging and discharging management module electrically connects with central processing unit, and central processing unit receives the voltage and current signal of circuit signal acquisition module and inputs blood pressure lowering charging signals to charging voltage reduction module and provide battery module switching signal to battery component; Described exclusive circuit module is provided power supply by power management module and electrically connects with central processing unit, described voice tone telecommunication circuit module, voice tone PAC circuit module are directly powered by battery component and electrically connect with central processing unit, and described voice tone telecommunication circuit module electrically connects with described voice tone PAC circuit module. Described sending dotter signal selects switch to electrically connect with central processing unit, voice tone telecommunication circuit module; Described sending dotter signal selects switch to be provided power supply by power management module. Described LED light is connected with central processing unit, and described LED light is directly powered by battery component.

As in figure 2 it is shown, described battery charging and discharging management module includes charging voltage reduction module, circuit signal acquisition module and battery component, in described battery component, comprise two battery modules, described charging voltage reduction module includes audion Q18, charging current protection circuit and decompression tube Q3, the input that base stage is buck signal of described audion Q18, the input of this buck signal accesses 1 foot of central processing unit, the collector and emitter of audion Q18 passes into charging current protection circuit loop, charging current protection circuit is connected with colelctor electrode with the base stage of decompression tube Q3, the emitter stage of described decompression tube Q3 is divided into two-way: a road output buck power supply, one road is provided with the combination of circuit signal acquisition module, then access the set of cells charging end of battery component, described circuit signal acquisition module is connected with central processing unit, and the battery charge collected and battery charging voltage input central processing unit and the battery charge input charging current protection circuit that circuit signal acquisition module will collect, the battery module port switching of described battery component is connected with 32 feet of central processing unit. as shown in the figure, + 18V is through the unidirectional isolation of diode D2 in exchange, by inductance L6, electric capacity C12, the filtered main circuit power of C26 is sent to decompression tube Q3, blood pressure lowering mode is on-off mode, the buck signal sent by 1 foot of central processing unit is through electric capacity C60, resistance R61 promotes audion Q18 turn off and open Q3 signal, direct current signal is through diode D5, inductance L3, electric capacity C23 filtering obtains the DC source after blood pressure lowering, this supply voltage is through the resistance R31 of circuit signal acquisition module, R60 dividing potential drop feeds back to central processor unit, the size of this voltage is sampled through E1 by resistance R62, R65, C9 gained current signal feeds back to central processor unit simultaneously, another loop of this current signal is through being positioned at the resistance R76 of charging current protection circuit, send into Q77 after R77 dividing potential drop to compare, after exceeding certain numerical value, by resistance R70, R79 controls Q15 output high level and is forced shutdown decompression tube Q3. power supply after blood pressure lowering is sent to the 3rd foot of battery component and points out assembly charging port, charging voltage size is fed back to central processor unit by resistance R31, R60 dividing potential drop equally, charging current is fed back to central processor unit by E1, R65, C9, after voltage reaches the upper voltage limit of set of cells, this buck signal will turn off. the discharge and recharge in turn of two battery modules in battery component is arranged by 32 foot output battery switching signals of central processing unit.

Power management module as described in Fig. 3, Fig. 4 includes isolation filter module, is used for processing+18V alternating current, flows into battery charging and discharging module or provides emergent external power source, article 3, power supply provides circuit: manages the voltage dropping power supply circuit of the voltage reduction module that charges in module from battery charging and discharging, manages the battery component power circuit of module and emergent external power source circuit from battery charging and discharging, inputs three kinds of different electrical power modes, voltage conversion chip, for being converted to+5V intrinsic safety electric source by above-mentioned three kinds of input powers. described emergent external power source circuit includes starting current protection circuit, for controlling the audion Q10 that emergent external power source circuit turns off or opens, the biasing resistor R30 of audion Q10, the audion Q9 of grounded emitter, and it is serially connected with the dropping resistor R78 between audion Q10 base stage and audion Q9 colelctor electrode, wherein, the colelctor electrode of audion Q10, the base stage of audion Q9 all protects circuit to electrically connect with starting current, biasing resistor R30 connects with dropping resistor R78, and the emitter stage of audion Q10 accesses voltage conversion chip, described voltage dropping power supply circuit and battery component power circuit are divided into two-way: voltage conversion chip is accessed on a road, and another road electrically connects with the base stage of audion Q9. as shown in the figure, + 18V is through the unidirectional isolation of diode D2 in exchange, by inductance L6, electric capacity C12, C26 filters, starting current protection circuit it is made up of resistance R63 and audion Q12, if the audion Q12 conducting output 18V voltage in starting protection circuit sends into Q9 base stage through protective resistance R66, voltage through dropping resistor R78 blood pressure lowering thus closing audion Q10, emergent external power source circuit input is made to disconnect, under peacetime state, audion Q12 is not turned on, audion Q10 is biased conducting by biasing resistor R30 makes Q10 base send into blood pressure lowering, integrated circuit U4 powers through central processing unit, foregoing description power supply non-master working power, for emergent external power source, the charging reduction voltage loop supply that main working power is produced by battery charging and discharging loop, employing is the pressure drop mode conversion gained that charges efficiently, because efficiency is high, thus comparatively efficient by the plucked little energy of main circuit voltage. efficient voltage dropping power supply is sent to the anode of D6 through unilateral diode D3, R64 current-limiting resistance, makes its Q9 turn on after being punctured by ZW1 Zener diode simultaneously, closes main circuit power supply audion Q10. also having a power source is battery feed circuit, and power supply is sent to D6 anode by the unidirectional isolating diode of D4, makes its Q9 turn on after being punctured by ZW1 Zener diode simultaneously, closes main circuit power supply audion Q10. this expansion telephone call screener adopts three kinds of power supplys select, preferentially use voltage dropping power supply, be secondly internal cell power supply, when cell voltage power shortage, the emergent external power source start-up circuit of major loop.

Sending dotter signal selects switch to have four kinds of tone selections, by SW1 codes selection tone by 2 foot outputs of central processing unit, filter through R4, C6, R9, C5, C56, amplify through triode Q8 and send into the electrical switch U3 incoming IC3 power amplification of conducting, send on voice band line for IC4A, IC4B switch. Described voice tone telecommunication circuit module includes DAB and produces circuit, voice is opened C39 DC-isolation by the input of mike MIC+ end through U30 electrical switch and is sent into diversity IC3, then is exported to capacitance C20 to voice band line by electrical switch IC4A, IC4B control. Described voice tone PAC circuit module includes digital power amplifying circuit, and under holding state, voice signal is amplified by 5 feet outputs by IC2 by R12, C16, and C21 to electrical switch U3C sends into digital power amplifying circuit U5 and shifts speaker onto.

Schematically the present invention and embodiment thereof being described above, this description does not have restricted, and shown in accompanying drawing is also one of embodiments of the present invention, and actual structure is not limited thereto. So, if those of ordinary skill in the art is enlightened by it, when without departing from the invention objective, design the frame mode similar to this technical scheme and embodiment without creationary, protection scope of the present invention all should be belonged to.

Claims (7)

1. the expansion telephone call screener effectively managed based on power supply, including power management module, central processing unit, exclusive circuit module, voice tone telecommunication circuit module and voice tone PAC circuit module, it is characterized in that: also include battery charging and discharging management module, described battery charging and discharging management module includes charging voltage reduction module, circuit signal acquisition module and battery component, comprises two battery modules in described battery component; Described power management module includes 3 power supplys provides circuit: manages the voltage dropping power supply circuit of the voltage reduction module that charges in module from battery charging and discharging, manages the battery component power circuit of module and emergent external power source circuit from battery charging and discharging; Described battery charging and discharging management module electrically connects with central processing unit, and central processing unit receives the voltage and current signal of circuit signal acquisition module and inputs blood pressure lowering charging signals to charging voltage reduction module and provide battery module switching signal to battery component; Described exclusive circuit module is provided power supply by power management module and electrically connects with central processing unit, described voice tone telecommunication circuit module, voice tone PAC circuit module are directly powered by battery component and electrically connect with central processing unit, and described voice tone telecommunication circuit module electrically connects with described voice tone PAC circuit module.
2. a kind of expansion telephone call screener effectively managed based on power supply according to claim 1, it is characterized in that: described charging voltage reduction module includes audion Q18, charging current protection circuit and decompression tube Q3, the input that base stage is buck signal of described audion Q18, the input of this buck signal accesses central processing unit, the collector and emitter of audion Q18 passes into charging current protection circuit loop, charging current protection circuit is connected with colelctor electrode with the base stage of decompression tube Q3, the emitter stage of described decompression tube Q3 is divided into two-way: a road output buck power supply, one road is provided with the combination of circuit signal acquisition module, then access the set of cells charging end of battery component, described circuit signal acquisition module is connected with central processing unit, and the battery charge collected and battery charging voltage input central processing unit and the battery charge input charging current protection circuit that circuit signal acquisition module will collect, the battery module port switching of described battery component electrically connects with central processing unit.
3. a kind of expansion telephone call screener effectively managed based on power supply according to claim 1 or 2 any one, it is characterized in that: described power management module includes isolation filter module, for processing+18V alternating current, flow into battery charging and discharging module or emergent external power source is provided; Article three, power supply provides circuit, inputs three kinds of different electrical power modes; Voltage conversion chip, for being converted to+5V intrinsic safety electric source by above-mentioned three kinds of input powers.
4. a kind of expansion telephone call screener effectively managed based on power supply according to claim 3, it is characterized in that: described emergent external power source circuit includes starting current protection circuit, for controlling the audion Q10 that emergent external power source circuit turns off or opens, the biasing resistor R30 of audion Q10, the audion Q9 of grounded emitter, and it is serially connected with the dropping resistor R78 between audion Q10 base stage and audion Q9 colelctor electrode, wherein, the colelctor electrode of audion Q10, the base stage of audion Q9 all protects circuit to electrically connect with starting current, biasing resistor R30 connects with dropping resistor R78, the emitter stage of audion Q10 accesses voltage conversion chip, described voltage dropping power supply circuit and battery component power circuit are divided into two-way: voltage conversion chip is accessed on a road, and another road electrically connects with the base stage of audion Q9.
5. a kind of expansion telephone call screener effectively managed based on power supply according to claim 4, it is characterised in that: also include sending dotter signal and select switch, described sending dotter signal to select switch to electrically connect with central processing unit, voice tone telecommunication circuit module; Described sending dotter signal selects switch to be provided power supply by power management module.
6. a kind of expansion telephone call screener effectively managed based on power supply according to claim 5, it is characterised in that: described voice tone telecommunication circuit module includes DAB and produces circuit, and described voice tone PAC circuit module includes digital power amplifying circuit.
7. a kind of expansion telephone call screener effectively managed based on power supply according to claim 6, it is characterised in that: also including LED light, described LED light is connected with central processing unit, and described LED light is directly powered by battery component.
CN201510969183.2A 2015-12-18 2015-12-18 Broadcast telephone based on effective power management CN105635377B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109649996A (en) * 2018-12-29 2019-04-19 常州三恒自动化科技有限公司 Mining working face and belt-conveying monitoring system

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CN101394094A (en) * 2007-09-20 2009-03-25 李仕清 Full automatic high efficient voltage step-up step-down circuit
CN202475553U (en) * 2011-12-31 2012-10-03 徐州中矿大华洋通信设备有限公司 Mine intrinsic safe hand-free full duplex sound amplifying phone
CN104253469A (en) * 2014-09-24 2014-12-31 于志章 Secondary battery pack charging and discharging management system

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Publication number Priority date Publication date Assignee Title
US20060113969A1 (en) * 2004-10-29 2006-06-01 Tadata Hatanaka Voltage detection circuit, overcurrent detection circuit, charging current control system, and voltage detection method
US20070013434A1 (en) * 2005-07-18 2007-01-18 Dialog Semiconductor Gmbh Voltage regulated charge pump with regulated charge current into the flying capacitor
CN101394094A (en) * 2007-09-20 2009-03-25 李仕清 Full automatic high efficient voltage step-up step-down circuit
CN202475553U (en) * 2011-12-31 2012-10-03 徐州中矿大华洋通信设备有限公司 Mine intrinsic safe hand-free full duplex sound amplifying phone
CN104253469A (en) * 2014-09-24 2014-12-31 于志章 Secondary battery pack charging and discharging management system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109649996A (en) * 2018-12-29 2019-04-19 常州三恒自动化科技有限公司 Mining working face and belt-conveying monitoring system

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