CN105071795A - A Multiplexing Circuit Based on USB Interface - Google Patents
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Abstract
Description
技术领域technical field
本发明实施例涉及电子电路技术，尤其涉及一种基于USB接口的复用电路。The embodiment of the present invention relates to electronic circuit technology, in particular to a multiplexing circuit based on a USB interface.
背景技术Background technique
随着智能手机的快速发展，人们已经不能仅仅满足于功能上的实现，也对产品的差异化和至美视觉提出了更高的需求。其中极致超薄就是手机设计者和消费者的一大诉求。为了实现这个目的，手机设计就要从各个方面去评估器件的高度，比如3.5mm耳机就是影响手机超薄设计的一个重要因素，为了兼顾耳机的功能和性能，一种解决方案需要对耳机与通用串行总线(UniversalSerialBus，USB)的接口采用复用的设计方式，具体是将USB接口复用为耳机接口。对于5个引脚(pin)的USB接口，耳机接口中的麦克风(microphone，MIC)信号通常会选择ID脚或者充电脚进行复用。With the rapid development of smart phones, people are not only satisfied with the realization of functions, but also put forward higher requirements for product differentiation and perfect vision. Among them, extreme ultra-thinness is a major demand of mobile phone designers and consumers. In order to achieve this goal, mobile phone design must evaluate the height of the device from various aspects. For example, 3.5mm earphones are an important factor affecting the ultra-thin design of mobile phones. A serial bus (Universal Serial Bus, USB) interface adopts a multiplexing design method, specifically, the USB interface is multiplexed as an earphone interface. For a USB interface with 5 pins, the microphone (microphone, MIC) signal in the earphone interface usually selects the ID pin or the charging pin for multiplexing.
然而，采用ID脚来复用的情况，由于手机需要支持的设备比较多，此时就会出现耳机检测与其他设备ID冲突的问题。若MIC信号复用充电引脚，复用时会出现MIC信号受到充电通路的干扰问题，所以需要进行隔离。However, in the case of using the ID pin for multiplexing, since the mobile phone needs to support more devices, there will be a problem of headphone detection conflicting with other device IDs. If the MIC signal is multiplexed with the charging pin, the MIC signal will be interfered by the charging path during multiplexing, so isolation is required.
如图1所示为现有技术中复用USB接口为耳机接口的电路示意图，该电路包括USB接口10、切换芯片30、音频处理单元40和充电单元50。具体地，USB接口10通过切换芯片30与音频处理单元40和充电单元50连接，当复用USB接口10为耳机接口时，音频处理单元40中的MIC信号线对应的是USB接口10的充电引脚VBUS，音频处理单元40中的左、右声道信号线对应的是USB接口10中的DM、DP脚，通过切换芯片30的切换功能控制接口的复用。如当给切换芯片30的EN脚施加一个高电平时，切换芯片30就控制内部的单刀双掷开关使充电引脚VBUS接通充电单元50，对手机进行充电，当给切换芯片的EN脚施加一个低电平时，切换芯片30就控制内部的单刀双掷开关使充电引脚VBUS与MIC信号线连接，传输音频信号，同时使音频处理单元的左右声道线S_L、S_H与USB接口10的DM、DP脚分别接通，实现复用功能。As shown in FIG. 1 , a schematic circuit diagram of multiplexing a USB interface as an earphone interface in the prior art, the circuit includes a USB interface 10 , a switching chip 30 , an audio processing unit 40 and a charging unit 50 . Specifically, the USB interface 10 is connected to the audio processing unit 40 and the charging unit 50 through the switching chip 30. When the USB interface 10 is multiplexed as the earphone interface, the MIC signal line in the audio processing unit 40 corresponds to the charging port of the USB interface 10. Pin VBUS, the left and right channel signal lines in the audio processing unit 40 correspond to the DM and DP pins in the USB interface 10, and the multiplexing of the interface is controlled by the switching function of the switching chip 30. For example, when a high level is applied to the EN pin of the switching chip 30, the switching chip 30 controls the internal SPDT switch so that the charging pin VBUS is connected to the charging unit 50, and the mobile phone is charged. When the EN pin of the switching chip is applied When a low level, the switching chip 30 controls the internal SPDT switch to connect the charging pin VBUS to the MIC signal line to transmit audio signals, and simultaneously connect the left and right channel lines S_L and S_H of the audio processing unit to the DM of the USB interface 10. , DP pins are respectively connected to realize multiplexing function.
目前对于USB与耳机接口复用的产品设计，对于MIC信号和充电引脚的复用采用单刀双掷或者单刀多掷的形式，一般采用集成的芯片来完成此功能，如图1中的切换芯片，此方案中需要复用的线路较多，采用多路复用功能的集成芯片成本相对较高，且电路不可裁剪，电路设计不够优化。At present, for the product design of multiplexing USB and earphone interface, the multiplexing of MIC signal and charging pin adopts the form of single pole double throw or single pole multiple throw, and generally uses an integrated chip to complete this function, as shown in the switching chip in Figure 1 , In this solution, there are many lines that need to be multiplexed, and the cost of the integrated chip using the multiplexing function is relatively high, and the circuit cannot be tailored, and the circuit design is not optimized enough.
发明内容Contents of the invention
本发明的实施例目的在于提供了一种基于USB接口的复用电路，以解决以USB接口复用为耳机接口，充电引脚作为传输MIC信号受到充电信号干扰问题。The purpose of the embodiments of the present invention is to provide a multiplexing circuit based on the USB interface to solve the problem that the USB interface is multiplexed as the earphone interface, and the charging pin is used as the transmission MIC signal to be interfered by the charging signal.
本发明实施例提供了一种基于USB接口的复用电路，包括USB接口、切换芯片、音频处理单元和充电单元，所述切换芯片连接在所述USB接口和音频处理单元之间，所述电路还包括：An embodiment of the present invention provides a multiplexing circuit based on a USB interface, including a USB interface, a switching chip, an audio processing unit, and a charging unit, the switching chip is connected between the USB interface and the audio processing unit, and the circuit Also includes:
隔离开关单元，所述隔离开关单元的输入端与所述USB接口的充电引脚相连，所述隔离开关单元的输出端分别与所述充电单元以及所述音频处理单元连接，用于根据所述充电引脚的电压值，交替地导通所述充电引脚与充电单元或所述音频处理单元之间通路的其中一条，同时隔离另一条。An isolating switch unit, the input end of the isolating switch unit is connected to the charging pin of the USB interface, and the output end of the isolating switch unit is respectively connected to the charging unit and the audio processing unit, for according to the The voltage value of the charging pin alternately conducts one of the paths between the charging pin and the charging unit or the audio processing unit while isolating the other.
本发明通过提供一种基于USB接口的复用电路，解决了USB接口充电引脚作为传输MIC信号复用的电路干扰问题，实现了MIC信号复用充电引脚时有效隔离干扰信号的效果，电路设计灵活、可裁剪且节省用户成本。By providing a multiplexing circuit based on the USB interface, the present invention solves the circuit interference problem that the charging pin of the USB interface is multiplexed as the transmission MIC signal, and realizes the effect of effectively isolating the interference signal when the MIC signal is multiplexing the charging pin. The design is flexible, tailorable and saves user cost.
附图说明Description of drawings
图1为现有技术中复用USB接口为耳机接口的电路示意图；Fig. 1 is the circuit schematic diagram of multiplexing the USB interface as the earphone interface in the prior art;
图2是本发明实施例一提供的一种基于USB接口的复用电路示意图；2 is a schematic diagram of a multiplexing circuit based on a USB interface provided by Embodiment 1 of the present invention;
图3是本发明实施例二提供的一种隔离开关电路图；Fig. 3 is a circuit diagram of an isolating switch provided in Embodiment 2 of the present invention;
图4是本发明实施例三提供的一种隔开开关电路图。Fig. 4 is a circuit diagram of a partition switch provided by Embodiment 3 of the present invention.
具体实施方式detailed description
下面结合附图和实施例对本发明作进一步的详细说明。可以理解的是，此处所描述的具体实施例仅仅用于解释本发明，而非对本发明的限定。另外还需要说明的是，为了便于描述，附图中仅示出了与本发明相关的部分而非全部结构。The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.
实施例一Embodiment one
图2为本发明实施例一提供的一种基于USB接口的复用电路示意图，本实施例可适用于USB接口复用为耳机接口的情况，本实施例提供的一种基于USB接口的复用电路，包括USB接口10、切换芯片30、音频处理单元40和充电单元50，所述切换芯片30连接在所述USB接口10和音频处理单元40之间，所述电路还包括：Figure 2 is a schematic diagram of a multiplexing circuit based on a USB interface provided by Embodiment 1 of the present invention. This embodiment is applicable to the case where a USB interface is multiplexed as an earphone interface. The circuit includes a USB interface 10, a switching chip 30, an audio processing unit 40 and a charging unit 50, the switching chip 30 is connected between the USB interface 10 and the audio processing unit 40, and the circuit also includes:
隔离开关单元20，所述隔离开关单元20的输入端与所述USB接口10的充电引脚VBUS相连，所述隔离开关单元20的输出端分别与所述充电单元50以及所述音频处理单元40连接，用于根据所述充电引脚VBUS的电压值，交替地导通所述充电引脚VBUS与充电单元50或音频处理单元40之间通路的其中一条，同时隔离另一条。An isolating switch unit 20, the input end of the isolating switch unit 20 is connected to the charging pin VBUS of the USB interface 10, and the output end of the isolating switch unit 20 is respectively connected to the charging unit 50 and the audio processing unit 40 The connection is used for alternately conducting one of the paths between the charging pin VBUS and the charging unit 50 or the audio processing unit 40 according to the voltage value of the charging pin VBUS, while isolating the other.
示例性的，当USB接口10接入电源充电时，充电引脚VBUS的电压相对较高，隔离开关单元20检测到充电引脚VBUS的高电压值，就接通充电引脚VBUS与充电单元50之间的通路，断开与音频处理单元40之间的通路；同时，切换芯片30检测到VBUS的高电压信号，就断开USB接口10上DM、DP引脚与音频处理单元40的S_L、S_R音频信号线的连接，接通相应的USB功能线路。当USB接口10接入耳机时，充电引脚VBUS的电压相对低，隔离开关单元20检测到充电引脚VBUS的低电压值，就接通充电引脚VBUS与音频处理单元40之间的通路，断开与充电单元50之间的通路；同时，切换芯片30检测到VBUS的低电压信号，就接通USB接口10上DM、DP引脚与音频处理单元40的S_L、S_R音频信号线的连接，实现接口的复用。Exemplarily, when the USB interface 10 is connected to a power supply for charging, the voltage of the charging pin VBUS is relatively high, and the isolation switch unit 20 detects the high voltage value of the charging pin VBUS, and then connects the charging pin VBUS and the charging unit 50. The path between them is disconnected with the path between the audio processing unit 40; at the same time, the switching chip 30 detects the high voltage signal of VBUS, and then disconnects the DM, DP pins on the USB interface 10 and the S_L, DP pins of the audio processing unit 40. Connect the S_R audio signal line and connect the corresponding USB function line. When the USB interface 10 is connected to the earphone, the voltage of the charging pin VBUS is relatively low, and the isolating switch unit 20 detects the low voltage value of the charging pin VBUS, and then connects the path between the charging pin VBUS and the audio processing unit 40, Disconnect the path with the charging unit 50; at the same time, the switching chip 30 detects the low voltage signal of VBUS, and then connects the DM, DP pins on the USB interface 10 and the S_L, S_R audio signal lines of the audio processing unit 40 , to realize the multiplexing of the interface.
本发明实施例提供的技术方案，以音频信号引脚与充电引脚共用实现USB接口复用为耳机接口，并且使音频信号与充电信号有效隔离，将耳机MIC信号的复用电路单独进行设计，节省了单刀双掷开关的路数，节约成本，并且电路设计灵活、可裁剪。In the technical solution provided by the embodiment of the present invention, the USB interface is multiplexed as the earphone interface by sharing the audio signal pin and the charging pin, and the audio signal is effectively isolated from the charging signal, and the multiplexing circuit of the earphone MIC signal is designed separately, The number of circuits of the single-pole double-throw switch is saved, the cost is saved, and the circuit design is flexible and can be cut.
实施例二Embodiment two
图3为本发明示例二提供的一种隔离开关电路图，实施例二是在实施一的基础上进行优化，优选的，所述隔离开关单元20包括：FIG. 3 is a circuit diagram of an isolating switch provided in Example 2 of the present invention. Embodiment 2 is optimized on the basis of Implementation 1. Preferably, the isolating switch unit 20 includes:
设备类型检测单元201，所述设备类型检测单元201的输入端与所述充电引脚VBUS连接，用于检测所述充电引脚VBUS接入的充电信号或音频信号，并根据所述充电引脚VBUS的信号类型输出高电平或低电平控制信号；A device type detection unit 201, the input terminal of the device type detection unit 201 is connected to the charging pin VBUS, for detecting the charging signal or audio signal connected to the charging pin VBUS, and according to the charging pin VBUS The signal type of VBUS outputs a high level or low level control signal;
信号选通控制单元202，第一输入端与所述设备类型检测单元201的输出端连接，第二输入端与所述充电引脚VBUS连接，第一输出端与所述充电单元50的电源输入端连接，第二输出端与所述音频处理单元40的音频信号输入端连接，用于接收所述设备类型检测单元201的控制信号控制所述充电引脚VBUS与充电单元50或音频处理单元40之间通路的连接或断开。Signal gating control unit 202, the first input end is connected to the output end of the device type detection unit 201, the second input end is connected to the charging pin VBUS, and the first output end is connected to the power input of the charging unit 50 The second output terminal is connected to the audio signal input terminal of the audio processing unit 40, and is used to receive the control signal of the device type detection unit 201 to control the charging pin VBUS and the charging unit 50 or the audio processing unit 40. connection or disconnection of paths.
优选的，设备类型检测单元201包括比较器U1；Preferably, the device type detection unit 201 includes a comparator U1;
所述比较器U1的同相输入端连接第二电源VDD2，用于接收预设参考电压；The non-inverting input terminal of the comparator U1 is connected to the second power supply VDD2 for receiving a preset reference voltage;
所述比较器U2的反相输入端通过限流电阻R1连接所述第一电源VDD1，且通过二极管D1连接所述充电引脚VBUS，所述二极管D1的阳极与所述反相输入端相连；The inverting input terminal of the comparator U2 is connected to the first power supply VDD1 through a current limiting resistor R1, and connected to the charging pin VBUS through a diode D1, and the anode of the diode D1 is connected to the inverting input terminal;
所述比较器U1的输出端与所述信号选通控制单元202的第一输入端连接，用于给所述信号选通控制单元202提供控制信号。The output end of the comparator U1 is connected to the first input end of the signal gating control unit 202 for providing a control signal to the signal gating control unit 202 .
比较器U1反向输入端接收的预设参考电压值可根据电路设计通过改变第一电源VDD2电压进行设计调节。电阻R1起限制电流的作用，降低系统的静态功耗，可根据二极管正向导通允许最大电流值进行设计选择。The preset reference voltage value received by the inverting input terminal of the comparator U1 can be designed and adjusted by changing the voltage of the first power supply VDD2 according to the circuit design. Resistor R1 plays the role of limiting the current and reducing the static power consumption of the system. It can be designed and selected according to the maximum current value allowed by the forward conduction of the diode.
优选的，所述信号选通控制单元202包括：Preferably, the signal gating control unit 202 includes:
二合一控制开关U2，所述二合一控制开关U2的控制端作为所述第一输入端，与所述设备类型检测单元201的输出端相连；所述二合一控制开关U2的输入端与所述充电引脚VBUS相连；所述二合一控制开关U2的第一输出端和第二输出端分别与所述充电单元50和音频信号处理单元40相连。Two-in-one control switch U2, the control end of the two-in-one control switch U2 is used as the first input end, connected to the output end of the device type detection unit 201; the input end of the two-in-one control switch U2 It is connected to the charging pin VBUS; the first output terminal and the second output terminal of the two-in-one control switch U2 are respectively connected to the charging unit 50 and the audio signal processing unit 40 .
二合一控制开关U2正常工作时，当控制端输入低电平时，二合一控制开关U2的第一输出端与输入端导通连接，同时二合一控制开关U2的第二输出端与输入端断开连接；当控制端输入高电平时，二合一控制开关U2的第一输出端与输入端断开连接，同时二合一控制开关U2的第二输出端与输入端导通连接。When the two-in-one control switch U2 is working normally, when the control terminal inputs a low level, the first output terminal of the two-in-one control switch U2 is connected to the input terminal, and at the same time, the second output terminal of the two-in-one control switch U2 is connected to the input terminal. terminal is disconnected; when the control terminal inputs a high level, the first output terminal of the two-in-one control switch U2 is disconnected from the input terminal, and at the same time, the second output terminal of the two-in-one control switch U2 is connected to the input terminal.
下面结合附图3来说明设备类型检测单元201与信号选通控制单元202的工作过程，示例性的，第一电源VDD1的电压为2.8V，第二电源VDD2的电压为2V。The working process of the device type detection unit 201 and the signal gating control unit 202 will be described below with reference to FIG. 3 . Exemplarily, the voltage of the first power supply VDD1 is 2.8V, and the voltage of the second power supply VDD2 is 2V.
当在USB接口接入电源信号进行充电时，USB充电引脚的电压为5V，二极管D1阴极端电压也即为5V，二极管D1阴极电压高于阳极电压，二极管D1方向截止，则比较器U1反向输入端接收到的电压为2.8V，此时，比较器U1的反向输入端的电压高于同向输入端的电压，比较器U1输出低电平。由于二合一控制开关U2的控制端与比较器U1的输出端连接，二合一控制开关U2控制端输入低电平，二合一控制开关控制USB充电引脚与第一输出端导通连接，即充电引脚与充电单元50连接且与音频处理单元40断开连接，实现充电功能。When the power signal is connected to the USB interface for charging, the voltage of the USB charging pin is 5V, the voltage of the cathode terminal of the diode D1 is also 5V, the cathode voltage of the diode D1 is higher than the anode voltage, and the direction of the diode D1 is cut off, then the comparator U1 reverses The voltage received at the input terminal is 2.8V. At this time, the voltage at the inverting input terminal of the comparator U1 is higher than the voltage at the non-inverting input terminal, and the comparator U1 outputs a low level. Since the control end of the two-in-one control switch U2 is connected to the output end of the comparator U1, the control end of the two-in-one control switch U2 inputs a low level, and the two-in-one control switch controls the USB charging pin to be connected to the first output end. , that is, the charging pin is connected to the charging unit 50 and disconnected from the audio processing unit 40 to realize the charging function.
当在USB接口接入耳机时，耳机音频信号为交流信号，USB充电引脚的电压为0～1.2V，二极管D1阳极电压高于阴极电压，二极管D1正向导通，由于二极管D1的钳位作用，比较器U1反向输入端接收到的电压为0～1.2V，此时，比较器U1反向输入端电压低于同向输入端电压，比较器U1输出高电平。此时，二合一控制开关U2控制端输入为高电平，二合一控制开关U2控制USB充电引脚与第二输出端导通连接，即充电引脚与音频处理单元40连接且与充电单元50断开连接，实现音频信号的隔离传输。When the earphone is connected to the USB interface, the audio signal of the earphone is an AC signal, the voltage of the USB charging pin is 0-1.2V, the anode voltage of the diode D1 is higher than the cathode voltage, and the forward conduction of the diode D1 is due to the clamping effect of the diode D1 , the voltage received by the inverting input terminal of the comparator U1 is 0-1.2V, at this time, the voltage at the inverting input terminal of the comparator U1 is lower than the voltage at the non-inverting input terminal, and the comparator U1 outputs a high level. At this time, the input of the control terminal of the two-in-one control switch U2 is at a high level, and the two-in-one control switch U2 controls the USB charging pin to be connected to the second output end, that is, the charging pin is connected to the audio processing unit 40 and connected to the charging pin. The unit 50 is disconnected to realize isolated transmission of audio signals.
在USB接口不接入任何设备时，此时比较器U1反向输入端电压为2.8V，与USB接口接入电源进行充电时的情况相同，不再赘述。When the USB interface is not connected to any device, the voltage at the reverse input terminal of the comparator U1 is 2.8V at this time, which is the same as when the USB interface is connected to a power supply for charging, and will not be repeated here.
本发明提供的技术方案，能有效的实现USB接口作为耳机接口复用，并且在复用时，音频信号能与充电信号隔离，消除充电信号对音频信号的干扰，与现有技术方案相比，将MIC信号的复用电路单独进行设计，节省单刀双掷开关的路数，节省成本，可实现电路灵活控制。The technical solution provided by the present invention can effectively realize the multiplexing of the USB interface as the earphone interface, and when multiplexing, the audio signal can be isolated from the charging signal, eliminating the interference of the charging signal on the audio signal. Compared with the prior art solution, The multiplexing circuit of the MIC signal is separately designed to save the number of single-pole double-throw switches, save costs, and realize flexible control of the circuit.
实施例三Embodiment three
图4为本发明实施三提供的一种隔离开关电路图，优选的，在实施例二的基础上，所述设备类型检测单元还包括：Fig. 4 is a circuit diagram of an isolating switch provided in Embodiment 3 of the present invention. Preferably, on the basis of Embodiment 2, the device type detection unit further includes:
串联在所述第一电源VDD1和地线之间的第一分压电阻R2和第二分压电阻R3，所述比较器U1的同相输入端连接在所述第一分压电阻R2和第二分压电阻R3之间；The first voltage dividing resistor R2 and the second voltage dividing resistor R3 are connected in series between the first power supply VDD1 and the ground wire, and the non-inverting input terminal of the comparator U1 is connected between the first voltage dividing resistor R2 and the second voltage dividing resistor R2. Between the voltage dividing resistor R3;
静电防护电阻R4，所述比较器U1的反相输入端通过静电防护电阻R4连接至所述第一电源VDD1；ESD protection resistor R4, the inverting input terminal of the comparator U1 is connected to the first power supply VDD1 through the ESD protection resistor R4;
防抖电容C，所述二极管D1的阳极通过所述防抖电容C接地；An anti-shake capacitor C, the anode of the diode D1 is grounded through the anti-shake capacitor C;
上拉电阻R5，所述比较器U1的输出端通过所述上拉电阻R5连接至第三电源VDD3。Pull-up resistor R5, the output terminal of the comparator U1 is connected to the third power supply VDD3 through the pull-up resistor R5.
在本实施中，只采用一个第一电源，通过第一分压电阻R2和第二分压电阻R3成组成分压电路来灵活的调节比较器U1同向输入端的预设参考电压，并且减少一个电源，节约成本。In this implementation, only one first power supply is used, and the first voltage dividing resistor R2 and the second voltage dividing resistor R3 are used to form a voltage dividing circuit to flexibly adjust the preset reference voltage of the same-inverting input terminal of the comparator U1, and reduce one power supply, saving costs.
静电防护电阻R4主要用于降低静电，保护电路器件，由于设备在使用时，USB接口是裸露在设备外壳上的，经常会产生静电感应，当这个静电感应电压通过二极管D1传输到静电防护电阻R4上时，就会在其上消耗掉，保护比较器U1等元器件。The static protection resistor R4 is mainly used to reduce static electricity and protect circuit devices. When the device is in use, the USB interface is exposed on the device shell, which often generates static induction. When the static induction voltage is transmitted to the static protection resistor R4 through the diode D1 , it will be consumed on it to protect comparator U1 and other components.
防抖电容C用于消除抖动，防止逻辑电平的误翻转。The anti-shake capacitor C is used to eliminate jitter and prevent false inversion of logic levels.
上拉电阻R5主要是为了增加比较器U1输出端的输出能力，以驱动后面电路工作。The pull-up resistor R5 is mainly used to increase the output capability of the output terminal of the comparator U1 to drive the following circuits to work.
本实施例提供的技术方案，对隔离开关电路进行了优化设计，使该电路抗干扰能力增强，并节省电路成本。The technical solution provided by this embodiment optimizes the design of the isolating switch circuit, which enhances the anti-interference ability of the circuit and saves circuit cost.
注意，上述仅为本发明的较佳实施例及所运用技术原理。本领域技术人员会理解，本发明不限于这里所述的特定实施例，对本领域技术人员来说能够进行各种明显的变化、重新调整和替代而不会脱离本发明的保护范围。因此，虽然通过以上实施例对本发明进行了较为详细的说明，但是本发明不仅仅限于以上实施例，在不脱离本发明构思的情况下，还可以包括更多其他等效实施例，而本发明的范围由所附的权利要求范围决定。Note that the above are only preferred embodiments of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention, and the present invention The scope is determined by the scope of the appended claims.
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