CN111435795A - Civil air defense alarm power management system with secondary alarm capability - Google Patents
Civil air defense alarm power management system with secondary alarm capability Download PDFInfo
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit 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
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- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
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- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Abstract
The invention discloses a civil air defense warning power supply management system with secondary warning capacity, and belongs to the technical field of civil air defense. The system comprises a control module, a lithium battery pack, a battery parameter acquisition module, a battery discharge maintenance module, a battery heating module, a mains supply power supply control module, a battery power supply control module, a power supply selection module and a fan. The invention can provide standby power supply for the alarm and the controller, so that the alarm and the controller have the capability of secondary alarm.
Description
Technical Field
The invention relates to a civil air defense warning power supply management system with secondary warning capability, and belongs to the technical field of civil air defense.
Background
The civil air defense warning system plays an important role in modern war, and all levels of civil air defense organize and command the masses to fight against air attacks through the civil air defense warning system. In peace time, people's air defense warning relevant knowledge education is carried out to people periodically, people's warning consciousness is strengthened, casualties can be reduced in wartime, and vital force is preserved. When natural disasters occur, the people defense warning system can send out warning in time, and casualties and people property loss are greatly reduced. Therefore, each level of civil air defense pays more attention to the anti-destruction capability of the civil air defense warning device.
However, most of the existing alarm devices use 220V commercial power for power supply, and when a power grid is damaged, the alarm devices in the area also lose alarm capability and do not have secondary alarm capability.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a civil air defense warning power supply management system with secondary warning capability, which can provide standby power supply for a warning device and a controller so as to enable the warning device and the controller to have the secondary warning capability.
In order to achieve the above purpose, the invention provides the following technical scheme:
a civil air defense warning power supply management system with secondary warning capability comprises a control module, a lithium battery pack, a battery parameter acquisition module, a battery discharge maintenance module, a battery heating module, a commercial power supply control module, a battery power supply control module, a power supply selection module and a fan;
the battery parameter acquisition module comprises a voltage acquisition circuit for acquiring the positive voltage of the lithium battery pack, a sampling resistor positioned on a charging and discharging trunk circuit of the lithium battery pack, two sampling circuits respectively used for acquiring the voltages at two ends of the sampling resistor, an electronic switch and an AD conversion chip, wherein the two sampling circuits are correspondingly connected with two input ports of the electronic switch one by one, and the input end of the AD conversion chip is connected with one output end of the electronic switch;
the battery discharge maintenance module comprises a discharge resistor for discharging the lithium battery pack and a first switch for controlling the on-off of the discharge resistor;
the battery heating module comprises a heating resistor for heating the lithium battery pack, a second switch for controlling the on-off of the heating resistor, and a battery temperature sensor for detecting the temperature of the lithium battery pack;
the mains supply control module comprises a detection circuit for detecting whether mains supply exists or not and a third switch for controlling the output of the mains supply;
the battery power supply control module comprises a fourth switch for controlling the output of battery power supply;
the power supply selection module comprises a mains supply input interface, at least one other power input interface, a charging interface for charging the lithium battery pack and a plurality of fifth switches; each fifth switch corresponds to one input interface and is used for controlling the on-off of the input interface and the charging interface;
the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the electronic switch and the fan are all controlled by the control module, and the AD conversion chip, the battery temperature sensor and the detection circuit all transmit data to the control module;
the control module executes a battery state detection program, a power state switching program, a maintenance discharge program, a battery temperature control program and a charging program, wherein,
the battery state detection program is for executing the steps of:
(101) the battery parameter acquisition module is used for acquiring the battery positive voltage U1 before discharge maintenance and the battery positive voltage U2 during discharge maintenance, and calculating the internal resistance r of the battery:
r＝(U1–U2)/I；
(102) the battery parameter acquisition module is used for acquiring the positive voltage U3 of the sampling resistor and the negative voltage U4 of the sampling resistor, and calculating the current I flowing through the battery according to the known resistance R of the sampling resistor:
I＝(U3–U4)/R；
(103) calculating the battery electric quantity E:
E＝U+r×I；
in the formula, U is the current voltage of the battery anode acquired by the battery parameter acquisition module;
the power state switching program is used for executing the following steps:
(201) detecting whether commercial power exists through a detection circuit, if so, executing a step (202), otherwise, executing a step (203);
(202) the commercial power supply output is turned on through the commercial power supply control module, and the battery power supply output is turned off through the battery power supply control module;
(203) the mains supply output is closed through the mains supply control module, and the battery supply output is opened through the battery supply control module;
the maintenance discharge program is used for executing the following steps:
(301) judging whether a maintenance instruction is received or the maintenance time is up, if so, executing a step (302);
(302) judging whether the current electric quantity of the battery meets a discharging condition, if so, executing a step (303);
(303) discharging maintenance is carried out on the battery through a battery discharging maintenance module;
(304) monitoring the electric quantity of the battery in real time through a battery state detection program, and stopping discharging when the electric quantity of the battery is lower than a preset value;
the battery temperature control program is used for executing the following steps:
(401) monitoring the temperature of the battery in real time through a battery temperature sensor, executing a step (402) if the temperature of the battery exceeds a first threshold value, and executing a step (403) if the temperature of the battery is lower than a second threshold value;
(402) the fan is turned on to dissipate heat, the temperature of the battery is continuously monitored through the battery temperature sensor, and heat dissipation is stopped when the temperature is lower than a third threshold value;
(403) heating the battery through the heating resistor, continuously monitoring the temperature of the battery through the battery temperature sensor, and stopping heating when the temperature reaches a fourth threshold value;
the charging program is used for executing the following steps:
(501) judging whether a charging instruction is received or not or the battery electric quantity reaches a charging threshold value, if so, executing a step (502);
(502) closing a fifth switch through the power supply selection module so as to conduct the power input interface corresponding to the fifth switch, wherein at most one fifth switch is closed at each moment;
(503) detecting whether a voltage difference exists between two ends of the sampling resistor through a battery parameter acquisition module so as to judge whether current passes through the lithium battery pack, if no voltage difference exists, executing a step (504), and if yes, executing a step (505);
(504) repeating steps (502) - (503) with another fifth switch closed;
(505) and charging the battery pack by using the current power input interface until a charging stopping instruction is received or the battery parameter acquisition module detects that the battery pack is fully charged, and disconnecting the currently conducted fifth switch.
Furthermore, the battery power supply control modules are two in number and are respectively used for controlling the power supply of the lithium battery pack to the alarm and the controller, wherein the battery power supply control module used for controlling the power supply of the controller further comprises a battery voltage conversion module used for converting the output voltage of the lithium battery pack into the input voltage of the controller.
Further, the system also comprises a mains voltage conversion module used for converting the mains voltage into the power supply voltage of the alarm and the controller.
Further, the heating resistor is powered by a lithium battery pack.
Furthermore, the device also comprises a display module and a mobile communication module, wherein the display module and the mobile communication module are both connected with the control module.
As can be seen from the above description, the technical scheme of the invention has the beneficial effects that:
1. the invention is provided with a lithium battery pack, can accept various power supply inputs, can provide stable and reliable power supply outputs for the alarm and the controller, and can provide power supply for the alarm and the controller through the lithium battery pack when a commercial power grid is damaged, thereby ensuring that the alarm and the controller have the capability of secondary alarm.
2. The invention has the functions of battery monitoring and maintenance, can carry out charging and discharging maintenance on the battery pack in time, ensures that the battery is in a usable state, and improves the reliability of the battery.
3. The invention also has the function of heating the battery, can ensure the normal work of the battery under the cold condition, and further improves the reliability of the battery.
Drawings
In order to more clearly describe this patent, one or more of the following figures are provided.
FIG. 1 is a block diagram of an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a control module in an embodiment of the invention;
FIG. 3 is a schematic circuit diagram of a battery parameter acquisition module according to an embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of a detection circuit according to an embodiment of the present invention;
FIG. 5 is a schematic circuit diagram of a power selection module according to an embodiment of the invention;
fig. 6 is a schematic diagram of a circuit for controlling the output of the mains supply in an embodiment of the present invention;
FIG. 7 is a schematic circuit diagram of a battery discharge maintenance module in an embodiment of the present invention;
FIG. 8 is a schematic circuit diagram of the heating portion of the battery heating module in an embodiment of the present invention;
fig. 9 is a schematic circuit diagram of a fan control circuit according to an embodiment of the present invention.
The circuit symbols in fig. 2 to 9 are common knowledge of those skilled in the art, and are not described herein again.
Detailed Description
In order to facilitate the understanding of the technical solutions of the present patent by those skilled in the art, the technical solutions of the present patent are further described in the following specific cases.
As shown in fig. 1, a civil air defense warning power management system with secondary warning capability includes a control module, a lithium battery pack, a battery parameter acquisition module, a battery discharge maintenance module, a battery heating module, a commercial power supply control module, a battery power supply control module, a power selection module, and a fan. Wherein:
the battery parameter acquisition module comprises a voltage acquisition circuit for acquiring the positive voltage of the lithium battery pack, a sampling resistor, two sampling circuits, an electronic switch and an AD conversion chip, wherein the sampling resistor is positioned on a charging and discharging trunk circuit of the lithium battery pack, the two sampling circuits are respectively used for acquiring the voltages at two ends of the sampling resistor, the two sampling circuits are connected with two input ports of the electronic switch in a one-to-one correspondence manner, and the input end of the AD conversion chip is connected with one output end of the electronic switch.
Specifically, a schematic circuit diagram of the battery parameter acquisition module is shown in fig. 3. The circuit mainly comprises two parts, wherein the rightmost side of the circuit is a battery voltage acquisition circuit, and the rest part of the circuit is a voltage acquisition circuit of a sampling resistor. In the voltage acquisition circuit of the sampling resistor, the voltage required to be acquired is selected through the CD4051 electronic switch, and the voltage is subjected to AD conversion through the MCP3421 chip, so that the voltages at two ends of the sampling resistor are acquired and transmitted to the control module. The control module can know whether the current is charging or discharging by calculating the voltage at two ends of the sampling resistor, and can calculate the current magnitude. In the circuit of fig. 3, the sampling resistor is 0.5m Ω, the voltage collected by the battery voltage collecting circuit is the voltage of the positive electrode of the battery, the load comprises a plurality of parallel branches such as a maintenance resistor, an alarm, a controller and a fan, and the on-off of each parallel branch is controlled by the control module, so that the equivalent resistance of the load is changed.
The battery discharge maintenance module comprises a discharge resistor for discharging the lithium battery pack and a first switch for controlling the on-off of the discharge resistor. The control module carries out discharge maintenance on the battery at regular time, and in the maintenance process, the temperature of the battery is detected through the battery temperature sensor, and the fan is started or the discharge is stopped when necessary, so that the equipment is prevented from being overheated. The circuit schematic of the module is shown in fig. 7, and the circuit schematic of the fan control circuit is shown in fig. 9.
The battery heating module comprises a heating resistor for heating the lithium battery pack, a second switch for controlling the on-off of the heating resistor, and a battery temperature sensor for detecting the temperature of the lithium battery pack. The control module judges whether the battery needs to be heated according to the detection value of the battery temperature sensor, and in the heating process, the real-time temperature of the battery is detected through the battery temperature sensor, so that the temperature of the battery is maintained in a reasonable interval, and the normal work of the battery is ensured. The circuit schematic of the heating portion of the module is shown in fig. 8.
The mains supply control module comprises a detection circuit for detecting whether mains supply exists or not and a circuit for controlling mains supply output. The detection circuit is shown in fig. 4, and detects whether 220VAC exists or not through an optical coupler; the circuit for controlling the commercial power supply output is shown in fig. 6, and controls the action of the solid state relay by controlling the triode and further controlling the relay, thereby controlling the output of 220 VAC.
The battery power supply control module includes a fourth switch for controlling the battery power supply output, and the principle thereof is similar to that of the commercial power supply control circuit shown in fig. 6, and is not described herein again.
The power supply selection module comprises a mains supply input interface, at least one other power input interface, a charging interface for charging the lithium battery pack and a plurality of fifth switches; and each fifth switch corresponds to one input interface and is used for controlling the on-off of the input interface and the charging interface. The circuit of the power supply selection module is shown in fig. 5, and the circuit selects a charging power supply in a mode of controlling a triode and further controlling a relay, wherein the charging power supply comprises 3 types of 220VAC, solar energy and wind energy.
The first switch, the second switch, the third switch, the fourth switch, the fifth switch, the electronic switch and the fan are all controlled by a control module, and the AD conversion chip, the battery temperature sensor and the detection circuit all transmit data to the control module, wherein the control module can be of a model STM32F103 RE-T6-L QFP64, and the wiring circuit of the control module is shown in figure 2.
Furthermore, the battery power supply control modules are two in number and are respectively used for controlling the power supply of the lithium battery pack to the alarm and the controller, wherein the battery power supply control module used for controlling the power supply of the controller further comprises a battery voltage conversion module used for converting the output voltage of the lithium battery pack into the input voltage of the controller. The battery voltage conversion module is a DC-DC module, and the circuit principle and the type selection mode thereof are common knowledge of those skilled in the art, and are not described herein again.
Further, the system also comprises a mains voltage conversion module used for converting the mains voltage into the power supply voltage of the alarm and the controller. Some existing alarms and controllers have a mains supply input interface, and a mains supply voltage conversion module is provided for the alarm and the controller, so that the mains supply voltage conversion module is not required to be arranged in the power management circuit structure, and for the alarm and the controller without the mains supply voltage conversion module, the mains supply voltage conversion module can be arranged in the power management circuit structure, and the principle and the type of the mains supply voltage conversion module are common knowledge of those skilled in the art, and are not described herein again.
Further, the heating resistor is powered by a lithium battery pack.
Furthermore, the power management circuit structure can also comprise a display module, a mobile communication module and a communication serial port, wherein the display module, the mobile communication module and the communication serial port are all connected with the control module. The display module is used for displaying the equipment parameters obtained by the control module, the mobile communication module can be used for enabling the control module to directly communicate with the outside and upload equipment data, and the communication serial port can facilitate equipment maintenance personnel to maintain and set the control module.
The control module executes a battery state detection program, a power state switching program, a maintenance discharge program, a battery temperature control program and a charging program, wherein,
the battery state detection program is for executing the steps of:
(101) the battery parameter acquisition module is used for acquiring the battery positive voltage U1 before discharge maintenance and the battery positive voltage U2 during discharge maintenance, and calculating the internal resistance r of the battery:
r＝(U1–U2)/I；
(102) the battery parameter acquisition module is used for acquiring the positive voltage U3 of the sampling resistor and the negative voltage U4 of the sampling resistor, and calculating the current I flowing through the battery according to the known resistance R of the sampling resistor:
I＝(U3–U4)/R；
(103) calculating the battery electric quantity E:
E＝U+r×I；
and U is the current voltage of the battery anode acquired by the battery parameter acquisition module.
The power state switching program is used for executing the following steps:
(201) detecting whether commercial power exists through a detection circuit, if so, executing a step (202), otherwise, executing a step (203);
(202) the commercial power supply output is turned on through the commercial power supply control module, and the battery power supply output is turned off through the battery power supply control module;
(203) and the commercial power supply output is closed through the commercial power supply control module, and the battery power supply output is opened through the battery power supply control module.
In addition, because the alarm and the controller in the prior art have circuits for automatically selecting power sources, the alarm and the controller can also simultaneously receive power supply outputs of the battery and the commercial power.
The maintenance discharge program is used for executing the following steps:
(301) judging whether a maintenance instruction is received or the maintenance time is up, if so, executing a step (302);
(302) judging whether the current electric quantity of the battery meets a discharging condition (for example, the electric quantity is more than 80%), if so, executing a step (303);
(303) discharging maintenance is carried out on the battery through a battery discharging maintenance module;
(304) the discharge is stopped when the battery charge is lower than a preset value, for example, the preset value for shallow maintenance is 60%, and the preset value for deep maintenance is 20%.
The battery temperature control program is used for executing the following steps:
(401) monitoring the temperature of the battery in real time through a battery temperature sensor, executing a step (402) if the temperature of the battery exceeds 40 ℃, and executing a step (403) if the temperature of the battery is lower than 0 ℃;
(402) opening a fan to dissipate heat, continuously monitoring the temperature of the battery through a battery temperature sensor, and stopping heat dissipation when the temperature is lower than 38 ℃;
(403) the battery is heated through the heating resistor, the temperature of the battery is continuously monitored through the battery temperature sensor, and the heating is stopped when the temperature reaches 35 ℃.
The charging program is used for executing the following steps:
(501) judging whether a charging instruction is received or not or the battery electric quantity reaches a charging threshold value, if so, executing a step (502);
(502) closing a fifth switch through the power supply selection module so as to conduct the power input interface corresponding to the fifth switch, wherein at most one fifth switch is closed at each moment;
(503) detecting whether a voltage difference exists between two ends of the sampling resistor through a battery parameter acquisition module so as to judge whether current passes through the lithium battery pack, if no voltage difference exists, executing a step (504), and if yes, executing a step (505);
(504) repeating steps (502) - (503) with another fifth switch closed;
(505) and charging the battery pack by using the current power input interface until a charging stopping instruction is received or the battery parameter acquisition module detects that the battery pack is fully charged, and disconnecting the currently conducted fifth switch.
In a word, the intelligent alarm device provided by the invention is provided with the lithium battery pack, can accept various power supply inputs, can provide stable and reliable power supply outputs for the alarm and the controller, and can provide power for the alarm and the controller through the lithium battery pack when a mains supply power grid is damaged, so that the intelligent alarm device has the capability of secondary alarm. In addition, the power management system also has the functions of battery monitoring, heating and maintenance, can carry out charging and discharging maintenance on the battery pack in time, can ensure the normal work of the battery under cold conditions, ensures the battery to be in a usable state, and improves the reliability of the battery.
It should be noted that the above embodiments are only specific examples of the implementation schemes of this patent, and do not cover all the implementation schemes of this patent, and therefore, the scope of protection of this patent cannot be considered as limited; all the implementations which belong to the same concept as the above cases or the combination of the above schemes are within the protection scope of the patent.
Claims (5)
1. A civil air defense warning power supply management system with secondary warning capability is characterized by comprising a control module, a lithium battery pack, a battery parameter acquisition module, a battery discharge maintenance module, a battery heating module, a commercial power supply control module, a battery power supply control module, a power supply selection module and a fan;
the battery parameter acquisition module comprises a voltage acquisition circuit for acquiring the positive voltage of the lithium battery pack, a sampling resistor positioned on a charging and discharging trunk circuit of the lithium battery pack, two sampling circuits respectively used for acquiring the voltages at two ends of the sampling resistor, an electronic switch and an AD conversion chip, wherein the two sampling circuits are correspondingly connected with two input ports of the electronic switch one by one, and the input end of the AD conversion chip is connected with one output end of the electronic switch;
the battery discharge maintenance module comprises a discharge resistor for discharging the lithium battery pack and a first switch for controlling the on-off of the discharge resistor;
the battery heating module comprises a heating resistor for heating the lithium battery pack, a second switch for controlling the on-off of the heating resistor, and a battery temperature sensor for detecting the temperature of the lithium battery pack;
the mains supply control module comprises a detection circuit for detecting whether mains supply exists or not and a third switch for controlling the output of the mains supply;
the battery power supply control module comprises a fourth switch for controlling the output of battery power supply;
the power supply selection module comprises a mains supply input interface, at least one other power input interface, a charging interface for charging the lithium battery pack and a plurality of fifth switches; each fifth switch corresponds to one input interface and is used for controlling the on-off of the input interface and the charging interface;
the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the electronic switch and the fan are all controlled by the control module, and the AD conversion chip, the battery temperature sensor and the detection circuit all transmit data to the control module;
the control module executes a battery state detection program, a power state switching program, a maintenance discharge program, a battery temperature control program and a charging program, wherein,
the battery state detection program is for executing the steps of:
(101) the battery parameter acquisition module is used for acquiring the battery positive voltage U1 before discharge maintenance and the battery positive voltage U2 during discharge maintenance, and calculating the internal resistance r of the battery:
r＝(U1–U2)/I；
(102) the battery parameter acquisition module is used for acquiring the positive voltage U3 of the sampling resistor and the negative voltage U4 of the sampling resistor, and calculating the current I flowing through the battery according to the known resistance R of the sampling resistor:
I＝(U3–U4)/R；
(103) calculating the battery electric quantity E:
E＝U+r×I；
in the formula, U is the current voltage of the battery anode acquired by the battery parameter acquisition module;
the power state switching program is used for executing the following steps:
(201) detecting whether commercial power exists through a detection circuit, if so, executing a step (202), otherwise, executing a step (203);
(202) the commercial power supply output is turned on through the commercial power supply control module, and the battery power supply output is turned off through the battery power supply control module;
(203) the mains supply output is closed through the mains supply control module, and the battery supply output is opened through the battery supply control module;
the maintenance discharge program is used for executing the following steps:
(301) judging whether a maintenance instruction is received or the maintenance time is up, if so, executing a step (302);
(302) judging whether the current electric quantity of the battery meets a discharging condition, if so, executing a step (303);
(303) discharging maintenance is carried out on the battery through a battery discharging maintenance module;
(304) monitoring the electric quantity of the battery in real time through a battery state detection program, and stopping discharging when the electric quantity of the battery is lower than a preset value;
the battery temperature control program is used for executing the following steps:
(401) monitoring the temperature of the battery in real time through a battery temperature sensor, executing a step (402) if the temperature of the battery exceeds a first threshold value, and executing a step (403) if the temperature of the battery is lower than a second threshold value;
(402) the fan is turned on to dissipate heat, the temperature of the battery is continuously monitored through the battery temperature sensor, and heat dissipation is stopped when the temperature is lower than a third threshold value;
(403) heating the battery through the heating resistor, continuously monitoring the temperature of the battery through the battery temperature sensor, and stopping heating when the temperature reaches a fourth threshold value;
the charging program is used for executing the following steps:
(501) judging whether a charging instruction is received or not or the battery electric quantity reaches a charging threshold value, if so, executing a step (502);
(502) closing a fifth switch through the power supply selection module so as to conduct the power input interface corresponding to the fifth switch, wherein at most one fifth switch is closed at each moment;
(503) detecting whether a voltage difference exists between two ends of the sampling resistor through a battery parameter acquisition module so as to judge whether current passes through the lithium battery pack, if no voltage difference exists, executing a step (504), and if yes, executing a step (505);
(504) repeating steps (502) - (503) with another fifth switch closed;
(505) and charging the battery pack by using the current power input interface until a charging stopping instruction is received or the battery parameter acquisition module detects that the battery pack is fully charged, and disconnecting the currently conducted fifth switch.
2. The people air defense warning power management system of claim 1, characterized in that the battery power supply control modules are two in number and are respectively used for controlling the power supply of the alarm and the controller by the lithium battery pack, wherein the battery power supply control module for controlling the power supply of the controller further comprises a battery voltage conversion module for converting the output voltage of the lithium battery pack into the input voltage of the controller.
3. The people air defense warning power management system of claim 1 further comprising a mains voltage conversion module for converting mains voltage to supply voltage for the siren and the controller.
4. The people air defense warning power management system of claim 1, characterized in that the heating resistor is powered by a lithium battery pack.
5. The people's air defense warning power management system of claim 1, further comprising a display module and a mobile communication module, both of which are connected with the control module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910030530.3A CN111435795A (en) | 2019-01-14 | 2019-01-14 | Civil air defense alarm power management system with secondary alarm capability |
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| CN201910030530.3A CN111435795A (en) | 2019-01-14 | 2019-01-14 | Civil air defense alarm power management system with secondary alarm capability |
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Inventor after: Ma Guangcun Inventor after: Wang Yan Inventor after: Jin Shanshan Inventor after: Sun Detao Inventor after: Yuan Hongqiang Inventor after: Peng Guanghui Inventor after: Zhao Guofu Inventor before: Cheng Zihan Inventor before: Yuan Hongqiang Inventor before: Zhao Guofu Inventor before: Wang Yan Inventor before: Sun Detao Inventor before: Zhang Xiaofei Inventor before: Liu Xinbao |