CN105635377B - Broadcast telephone based on effective power management - Google Patents

Broadcast telephone based on effective power management Download PDF

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Publication number
CN105635377B
CN105635377B CN201510969183.2A CN201510969183A CN105635377B CN 105635377 B CN105635377 B CN 105635377B CN 201510969183 A CN201510969183 A CN 201510969183A CN 105635377 B CN105635377 B CN 105635377B
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CN
China
Prior art keywords
module
power supply
circuit
battery
triode
Prior art date
Application number
CN201510969183.2A
Other languages
Chinese (zh)
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CN105635377A (en
Inventor
权循忠
吴琰
廖晓纬
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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 an extension telephone based on effective power management, and belongs to the field of mining communication electronic equipment. The invention comprises a power supply management module, a central processing unit, a locking circuit module, a voice ring tone sending circuit module, a voice ring tone receiving circuit module and a battery charging and discharging management module, wherein the battery charging and discharging management module comprises a charging voltage reduction module, a circuit signal acquisition module and a battery assembly, and the battery assembly comprises two battery modules; the power management module comprises 3 power supply circuits: the emergency power supply comprises a voltage reduction power supply circuit, a battery pack power supply circuit and an emergency external power supply circuit; the locking circuit module is powered by the power management module, and the voice ring tone transmitting circuit module and the voice ring tone receiving circuit module are directly powered by the battery component. The power supply management mode is efficient and flexible, the battery can be fully charged and discharged, and the problem of short service life caused by the nickel-hydrogen effect of the battery is solved.

Description

Broadcast telephone based on effective power management

Technical Field

The invention belongs to the field of mining communication electronic equipment, and particularly relates to an extension telephone based on effective power management.

Background

The underground mine is provided with a large number of equipment motors, early warning is often needed in the starting process of the motors, and the motors need signal transmission under the condition of emergency accidents. The broadcast telephone is an intrinsic safety type broadcast communication, signal communication, sound-light alarm and emergency stop locking device for mine, and is suitable for the environment with gas and coal dust explosion danger under the coal mine. It can be used as communication system of self-expanding broadcast and dotting signal, and can also receive external control signal, and can give out sound-light alarm signal for equipment starting advance notice or alarm.

The function of the extension phone in an automatic system of the motor of the equipment under the coal mine well is very important, but the existing extension phone has a single power supply, and if abnormal conditions occur, the power supply is turned off, and the extension phone cannot effectively transmit the running signal of the motor of the equipment.

Through search, the patent number: 201120577521.5, filing date: 2011, 12 and 31, the invention and creation name is: the mining intrinsic safety type full duplex audio-visual telephone with hands-free function. The broadcasting telephone in the patent is provided with a backup battery besides an external power supply, and can ensure that the broadcasting telephone normally works for more than 2 hours after the external power supply is powered off. In this patent, ordinary external power source conversion inefficiency, the battery is just as stand-by power supply, and power management is not high-efficient. In addition, in the prior art, a battery panel or a set of battery pack is generally arranged in the broadcast telephone, long-term insufficient cyclic charging and discharging are realized, and the service life of the battery is greatly shortened due to the memory effect of the nickel-hydrogen battery.

Disclosure of Invention

1. Technical problem to be solved by the invention

The broadcast telephone based on the effective power management adopts an efficient power management mode, acquires less voltage energy, adopts three power selection modes, and has high flexibility and good system strain capacity. The main working power supply is adopted for power supply, the battery power supply is standby and reasonably distributed, the energy management efficiency is effectively improved, and when the conditions of overload, abnormity and the like occur, only the local loop is disconnected, and the main circuit of the broadcast telephone keeps long-time uninterrupted power supply. The double battery modules are adopted for power supply, one battery module is charged and the other battery module is discharged under the control of the detection circuit and the central processing unit, so that the battery can be fully charged and discharged, and the problem of short service life caused by the nickel-hydrogen effect of the battery is solved.

2. Technical scheme

The invention discloses an extended broadcasting telephone based on effective power management, which comprises a power management module, a central processing unit, a locking circuit module, a voice ring tone transmitting circuit module and a voice ring tone receiving circuit module, and is characterized in that: the battery charging and discharging management module comprises a charging voltage reduction module, a circuit signal acquisition module and a battery assembly, wherein the battery assembly comprises two battery modules; the power management module comprises 3 power supply lines: a voltage reduction power supply line from a charging voltage reduction module in the battery charging and discharging management module, a battery assembly power supply line from the battery charging and discharging management module and an emergency external power supply line; the battery charging and discharging management module is electrically connected with the central processing unit, and the central processing unit receives a voltage and current signal of the circuit signal acquisition module, inputs a voltage reduction signal to the charging voltage reduction module and provides a battery module switching signal for the battery assembly; the locking circuit module is powered by the power management module and is electrically connected with the central processing unit, the voice ring tone transmitting circuit module and the voice ring tone receiving circuit module are directly powered by the battery assembly and are electrically connected with the central processing unit, and the voice ring tone transmitting circuit module is electrically connected with the voice ring tone receiving circuit module.

As a further improvement of the present invention, the charging buck module includes a triode Q18, a charging current protection circuit and a buck tube Q3, a base of the triode Q18 is an input end of a buck signal, the input end of the buck signal is connected to the central processing unit, a collector and an emitter of the triode Q18 are connected to a charging current protection circuit loop, the charging current protection circuit is connected to a base and an emitter of the buck tube Q3, and a collector of the buck tube Q3 is divided into two paths: one path of output voltage reduction power supply and the other path of output voltage reduction power supply are provided with a circuit signal acquisition module combination and then are connected to a battery pack charging end of the battery pack; the circuit signal acquisition module is connected with the central processing unit and inputs the acquired battery charging current and the battery charging voltage into the central processing unit, and the circuit signal acquisition module inputs the acquired battery charging current into the charging current protection circuit; and the battery module switching port of the battery assembly is electrically connected with the central processing unit.

As a further improvement of the invention, the power management module comprises an isolation filtering module, which is used for processing +18V alternating current, flowing into the battery charging and discharging module or providing an emergency external power supply; three power supply lines for inputting three different power supply modes; and the voltage conversion chip is used for converting the three input power supplies into a +5V intrinsic safety power supply.

As a further improvement of the present invention, the emergency external power supply line includes a start current protection circuit, a transistor Q10 for controlling the emergency external power supply line to be turned off or on, a bias resistor R30 of the transistor Q10, a transistor Q9 with an emitter grounded, and a step-down resistor R78 connected in series between the base of the transistor Q10 and the collector of the transistor Q9, wherein the collector of the transistor Q10 and the base of the transistor Q9 are both electrically connected to the start current protection circuit, the bias resistor R30 is connected in series with the step-down resistor R78, and the emitter of the transistor Q10 is connected to the voltage conversion chip; the voltage reduction power supply circuit and the battery pack power supply circuit are equally divided into two paths: one path is connected to the voltage conversion chip, and the other path is electrically connected with the base electrode of the triode Q9.

As a further improvement of the invention, the invention also comprises a dotting signal selection switch which is electrically connected with the central processing unit and the voice ring tone telephone sending circuit module; the dotting signal selection switch is powered by the power management module.

As a further improvement of the invention, the voice ring tone transmitting circuit module comprises a digital audio generating circuit, and the voice ring tone receiving circuit module comprises a digital power amplifying circuit.

As a further improvement of the invention, the LED lamp is also included and is connected with the central processing unit, and the LED lamp is directly powered by the battery component.

3. Advantageous effects

Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:

(1) the invention relates to an extension phone based on effective power management, wherein a battery pack comprises two battery modules, a central processing unit controls the charging of batteries according to voltage and current signals of a charging circuit, one battery module charges and the other battery module discharges, the two batteries can be fully charged and discharged all the time, the problem that the service life of the battery is short due to the nickel-hydrogen effect of the battery because only one battery in the existing extension phone is insufficiently charged and discharged for a long time is solved, and the service life of a common battery is effectively prolonged to more than one year in 3 months.

(2) The invention relates to an extension telephone based on effective power management, which adopts a power supply provided by a power supply management module to provide a power supply for a main working loop, adopts a battery component to provide a standby power supply for the extension telephone, and only a local loop is disconnected under the abnormal conditions of overload and the like, so that the main loop of the extension telephone keeps uninterrupted power supply for a long time.

(3) According to the broadcast telephone based on the effective power management, the power management module adopts 3 power supplies to supply power according to primary and secondary power supplies, so that the flexibility is high, and the system strain capacity is good.

(4) According to the broadcast telephone based on the effective power management, the main working power supply in the power management module is supplied by the charging voltage reduction circuit, the main working power supply is obtained by conversion in an efficient charging voltage reduction mode, and the energy captured by the voltage of the main circuit is less and more efficient due to high efficiency.

(5) According to the extended broadcasting telephone based on the effective power management, the triode Q9 adopted in the power management module can be used as a circuit protection switch of an emergency external power supply circuit and also can be used as a selection switch of a battery pack power supply circuit and a charging voltage reduction power supply circuit.

(6) According to the broadcasting telephone based on the effective power management, the power circuit inside the battery charging and discharging management module is reasonably designed, and the switching of the battery module can be effectively controlled according to the voltage and the current of the charging circuit.

(7) The broadcasting telephone based on the effective power management has the advantages of reasonable module circuit design, concise circuit, effective cost reduction and convenient popularization and use.

Drawings

Fig. 1 is a schematic diagram of a circuit module of an extension phone according to the present invention;

FIG. 2 is a circuit diagram of a battery charge/discharge management module according to the present invention;

FIG. 3 is a circuit diagram of a power management module according to the present invention;

fig. 4 is a combination diagram of a battery charging/discharging management circuit and a power management circuit according to the present invention.

Detailed Description

For a further understanding of the present invention, reference will now be made in detail to the embodiments illustrated in the drawings.

Example 1

As shown in fig. 1, the extended broadcasting telephone based on power supply effective management of the embodiment includes a battery charging and discharging management module, a power supply management module, a central processing unit, a locking circuit module, a voice ring tone transmitting circuit module, a voice ring tone receiving circuit module, a dotting signal selection switch, and an LED indicator. The battery charging and discharging management module is electrically connected with the central processing unit, and the central processing unit receives a voltage and current signal of the circuit signal acquisition module, inputs a voltage reduction signal to the charging voltage reduction module and provides a battery module switching signal for the battery assembly; the locking circuit module is powered by the power management module and is electrically connected with the central processing unit, the voice ring tone transmitting circuit module and the voice ring tone receiving circuit module are directly powered by the battery assembly and are electrically connected with the central processing unit, and the voice ring tone transmitting circuit module is electrically connected with the voice ring tone receiving circuit module. The dotting signal selection switch is electrically connected with the central processing unit and the voice ring tone and voice transmission circuit module; the dotting signal selection switch is powered by the power management module. The LED indicator light is connected with the central processing unit and is directly powered by the battery component.

As shown in fig. 2, the battery charging and discharging management module includes a charging step-down module, a circuit signal acquisition module, and a battery assembly, where the battery assembly includes two battery modules; the charging and voltage-reducing module comprises a triode Q18, a charging current protection circuit and a voltage-reducing tube Q3, wherein the base of the triode Q18 is the input end of a voltage-reducing signal, the input end of the voltage-reducing signal is connected with a pin 1 of a central processing unit, the collector and the emitter of the triode Q18 are connected into a charging current protection circuit loop, the charging current protection circuit is connected with the base and the emitter of the voltage-reducing tube Q3, and the collector of the voltage-reducing tube Q3 is divided into two paths: one path of output voltage reduction power supply and the other path of output voltage reduction power supply are provided with a circuit signal acquisition module combination and then are connected to a battery pack charging end of the battery pack; the circuit signal acquisition module is connected with the central processing unit and inputs the acquired battery charging current and the battery charging voltage into the central processing unit, and the circuit signal acquisition module inputs the acquired battery charging current into the charging current protection circuit; and a battery module switching port of the battery assembly is connected with a 32-pin of the central processing unit. As shown in the figure, alternating current +18V is isolated in a single direction through a diode D2, a main loop power supply filtered by an inductor L6, a capacitor C12 and a capacitor C26 is sent to a voltage reduction tube Q3, the voltage reduction mode is a switching mode, a voltage reduction signal sent by a pin 1 of a central processing unit pushes a triode Q18 through a capacitor C60 and a resistor R61 to turn off and turn on a Q3 signal, a direct current signal is filtered through a diode D5, an inductor L3 and a capacitor C23 to obtain a direct current power supply after voltage reduction, the power supply voltage is fed back to the central processing unit through the voltage division of the resistors R31 and R60 of the circuit signal acquisition module, the voltage is sampled by a resistor R62 and current signals obtained by E1, R65 and C9 are simultaneously fed back to the central processing unit, the other loop of the current signal is divided by resistors R76 and R77 in the charging current protection circuit and then sent to Q77 for comparison, and after the voltage exceeds a certain value, the Q15 is controlled by resistors R70 and R79 to output high level to forcibly turn off the voltage reducing tube Q3. The reduced voltage power is sent to a 3 rd pin point-out component charging port of the battery component, the charging voltage is divided by resistors R31 and R60 and fed back to the central processing unit, the charging current is fed back to the central processing unit by E1, R65 and C9, and the voltage reduction signal is automatically turned off after the voltage reaches the upper limit voltage of the battery pack. The 32-pin output battery switching signal of the central processing unit arranges the alternate charging and discharging of the two battery modules in the battery assembly.

The power management module shown in fig. 3 and 4 includes an isolation filter module for processing +18V ac power, flowing into a battery charging and discharging module or providing emergency external power; 3 power supply lines: a voltage reduction power supply line from a charging voltage reduction module in the battery charging and discharging management module, a battery assembly power supply line from the battery charging and discharging management module and an emergency external power supply line are input in three different power supply modes; and the voltage conversion chip is used for converting the three input power supplies into a +5V intrinsic safety power supply. The emergency external power supply line comprises a starting current protection circuit, a triode Q10 for controlling the emergency external power supply line to be turned off or turned on, a bias resistor R30 of a triode Q10, a triode Q9 with an emitting electrode grounded, and a voltage reduction resistor R78 connected between the base electrode of the triode Q10 and the collector electrode of the triode Q9 in series, wherein the base electrode of the triode Q10 and the base electrode of the triode Q9 are electrically connected with the starting current protection circuit, the bias resistor R30 is connected with the voltage reduction resistor R78 in series, and the emitting electrode of the triode Q10 is connected with a voltage conversion chip; the voltage reduction power supply circuit and the battery pack power supply circuit are equally divided into two paths: one path is connected to the voltage conversion chip, and the other path is electrically connected with the base electrode of the triode Q9. As shown in the figure, ac +18V is isolated unidirectionally through a diode D2, and is filtered by an inductor L6, a capacitor C12 and a C26, and a starting current protection circuit is formed by a resistor R63 and a transistor Q12, if a transistor Q12 in the starting protection circuit is turned on and outputs 18V voltage, the voltage is sent to a base of a transistor Q9 through a protection resistor R66, the voltage is reduced through a voltage reduction resistor R78 to turn off the transistor Q10, so that the input of an emergency external power supply line is disconnected, the transistor Q12 is not turned on in a normal state, the transistor Q10 is biased to be turned on by a bias resistor R30 to reduce the voltage of the base of the transistor Q10, and the integrated circuit U4 is powered by a central processing unit, wherein; the main working power supply is supplied by a charging voltage reduction circuit generated by a battery charging and discharging circuit, and is converted by adopting a high-efficiency charging voltage reduction mode, so that the efficiency is high, and the energy extracted by the voltage of the main circuit is less and is more efficient. The high-efficiency voltage-reducing power supply is sent to the positive end of the D6 through the current-limiting resistors of the unidirectional diodes D3 and R64, and meanwhile, the Q9 of the high-efficiency voltage-reducing power supply is conducted after the high-efficiency voltage-reducing power supply is broken down through the ZW1 voltage-stabilizing diode, and the power supply triode Q10 of the main loop is closed. And a power source is a battery power supply circuit, the power source is sent to the positive end of the D6 through a D4 unidirectional isolation diode, and meanwhile, the ZW1 voltage stabilizing diode breaks down to enable the Q9 of the diode to be conducted, and the power supply triode Q10 of the main loop is closed. This expand and broadcast the telephone in adopt three kinds of power selections, preferentially use the step-down power, secondly be the internal battery power, when battery voltage is insufficient, the emergent external power supply starting circuit of major loop.

The dotting signal selection switch has four kinds of ring tone selection, SW1 codes the selected ring tone, the ring tone is output from pin 2 of the CPU, filtered by R4, C6, R9, C5 and C56, amplified by the triode Q8, sent to the electronic switch U3, conducted and transmitted to the IC3 for power amplification, and sent to the audio circuit for the IC4A and IC4B switches. The voice ring tone sending circuit module comprises a digital audio generating circuit, voice is input from the MIC + end of the microphone, is input through the U30 electronic switch to turn on C39 direct current to be isolated and sent into the integrated IC3, and is output to the DC blocking capacitor C20 to an audio circuit under the control of the electronic switch IC4A and the IC 4B. The voice ring tone receiving circuit module comprises a digital power amplifying circuit, in a standby state, voice signals are amplified by an IC2 through R12 and C16 and output by a pin 5, and the voice signals are sent to an electronic switch U3C through the C21 and are pushed to a loudspeaker through a digital power amplifying circuit U5.

The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.

Claims (1)

1. The utility model provides an expand broadcasting telephone based on power is effective to be managed, includes power management module, central processing unit, blocking circuit module, voice ring tone send telephone circuit module and voice ring tone receive telephone circuit module, its characterized in that: the battery charging and discharging management module comprises a charging voltage reduction module, a circuit signal acquisition module and a battery assembly, wherein the battery assembly comprises two battery modules; the power management module comprises 3 power supply lines: a voltage reduction power supply line from a charging voltage reduction module in the battery charging and discharging management module, a battery assembly power supply line from the battery charging and discharging management module and an emergency external power supply line; the battery charging and discharging management module is electrically connected with the central processing unit, and the central processing unit receives a voltage and current signal of the circuit signal acquisition module, inputs a voltage reduction signal to the charging voltage reduction module and provides a battery module switching signal for the battery assembly; the locking circuit module is powered by a power management module and is electrically connected with a central processing unit, the voice ring tone sending circuit module and the voice ring tone receiving circuit module are directly powered by a battery assembly and are electrically connected with the central processing unit, the voice ring tone sending circuit module is electrically connected with the voice ring tone receiving circuit module, the charging and voltage reducing module comprises a triode Q18, a charging current protection circuit and a voltage reducing tube Q3, the base of the triode Q18 is the input end of a voltage reducing signal, the input end of the voltage reducing signal is connected with the central processing unit, the collector and the emitter of the triode Q18 are connected with a charging current protection circuit loop, the charging current protection circuit is connected with the base and the emitter of the voltage reducing tube Q3, and the collector of the voltage reducing tube Q3 is divided into two paths: one path of output voltage reduction power supply and the other path of output voltage reduction power supply are provided with a circuit signal acquisition module combination and then are connected to a battery pack charging end of the battery pack; the circuit signal acquisition module is connected with the central processing unit and inputs the acquired battery charging current and the battery charging voltage into the central processing unit, and the circuit signal acquisition module inputs the acquired battery charging current into the charging current protection circuit; the battery module switching port of the battery assembly is electrically connected with the central processing unit, and the power management module comprises an isolation filtering module which is used for processing +18V alternating current and flowing into the battery charging and discharging module or providing an emergency external power supply; three power supply lines for inputting three different power supply modes; the emergency external power supply circuit comprises a starting current protection circuit, a triode Q10 for controlling the emergency external power supply circuit to be turned off or on, a bias resistor R30 of the triode Q10, a triode Q9 with an emitting electrode grounded, and a voltage reduction resistor R78 connected between the base electrode of the triode Q10 and the collecting electrode of the triode Q9 in series, wherein the collecting electrode of the triode Q10 and the base electrode of the triode Q9 are electrically connected with the starting current protection circuit, the bias resistor R30 is connected with the voltage reduction resistor R78 in series, and the emitting electrode of the triode Q10 is connected into the voltage conversion chip; the voltage reduction power supply circuit and the battery pack power supply circuit are equally divided into two paths: one path is connected to a voltage conversion chip, the other path is electrically connected with the base of a triode Q9, the broadcast telephone further comprises a dotting signal selection switch, the dotting signal selection switch is electrically connected with a central processing unit and a voice ring tone telephone sending circuit module, a high-efficiency voltage reduction power supply is sent into the positive end of a D6 through a one-way diode D3 and an R64 current-limiting resistor, the Q9 of the high-efficiency voltage reduction power supply is conducted after being broken through a ZW1 voltage stabilizing diode, a main loop power supply triode Q10 is closed, a power source is a battery power supply circuit, the power supply is sent into the positive end of the D6 through a D4 one-way isolation diode, the Q9 of the high-efficiency voltage reduction telephone is conducted after being broken through a ZW1 voltage stabilizing diode, and the second power supply triode Q10 of the main loop power supply triode is closed.
CN201510969183.2A 2015-12-18 2015-12-18 Broadcast telephone based on effective power management CN105635377B (en)

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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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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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