CN215072348U - Multi-channel direct current acquisition multiplexing circuit based on analog switch - Google Patents
Multi-channel direct current acquisition multiplexing circuit based on analog switch Download PDFInfo
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- CN215072348U CN215072348U CN202120395804.1U CN202120395804U CN215072348U CN 215072348 U CN215072348 U CN 215072348U CN 202120395804 U CN202120395804 U CN 202120395804U CN 215072348 U CN215072348 U CN 215072348U
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Abstract
The utility model is suitable for an electronic information technical field relates to a multichannel direct current acquisition multiplexing circuit based on analog switch, include: the double-path four-channel CMOS analog multiplexer, the voltage isolator and the decoupling capacitor; the two-way four-channel CMOS analog multiplexer comprises an address line A0, an address line A1, an enable end EN, a chip digital Ground end group, a power supply section + V, a power supply section-V, a two-way four-one-out-of-one COMS analog switch, an output end OUTA and an output end OUTB; the third pin of the voltage isolator is connected with the output end OUTA, the first pin of the voltage isolator is connected with the second pin and outputs a signal AIN1+, the fifth pin of the voltage isolator is connected with the output end OUTB, and the sixth pin of the voltage isolator is connected with the seventh pin and outputs a signal AIN2 +. The utility model discloses can practice thrift analog-to-digital converter port resource, hardware circuit is simple, and input impedance is high, is favorable to realizing the miniaturization and the reduce cost of equipment.
Description
Technical Field
The utility model belongs to the technical field of electronic information, especially, relate to a multichannel direct current gathers multiplexing circuit based on analog switch.
Background
By utilizing modern electronic technology, communication technology, computer and network technology, the real-time information, the off-line information, the user information, the power grid structure parameters and the geographic information of the power distribution network are integrated to form a complete automatic management system, so that the monitoring, protection, control and power distribution management of the power distribution system under normal operation and accident conditions are realized. The system is a system integrating real-time power distribution automation and a power distribution management system.
The automation of the power distribution network is to apply computer technology, automatic control technology, electronic technology, communication technology and new high-performance power distribution equipment and other technical means to carry out off-line and on-line intelligent monitoring and management on the power distribution network, so that the power distribution network is always in a safe, reliable, high-quality, economic and efficient optimal operation state.
The problem that when an existing distribution network automatic terminal acquires eight direct-current analog signals, the AD converters of eight channels are required to acquire the eight direct-current analog signals, equipment and circuit structures in the mode are complex, waste of port resources of the analog-to-digital converters is caused, and cost is increased is solved.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a multichannel direct current gathers multiplexing circuit based on analog switch to the circuit of solving among the prior art causes the waste of analog to digital converter port resource and the problem of incremental cost.
In order to solve the technical problem, the utility model discloses a following technical scheme:
the utility model provides a multichannel direct current gathers multiplexing circuit based on analog switch, include:
the double-path four-channel CMOS analog multiplexer, the voltage isolator and the decoupling capacitor; the two-way four-channel CMOS analog multiplexer comprises an address line A0, an address line A1, an enable end EN, a chip digital Ground end group, a power supply section + V, a power supply section-V, a two-way four-one-out-one COMS analog switch, an output end OUTA and an output end OUTB; the first path of the two-path one-out-of-four CMOS analog switch is a pin IN1A, a pin IN2A, a pin IN3A and a pin IN4A, the second path of the two-path one-out-of-four CMOS analog switch is a pin IN1B, a pin IN2B, a pin IN3B and a pin IN4B, and the control of the two-path four-channel CMOS analog multiplexer is realized by connecting a digital signal control pin CS _ A0 with an address line A0 and connecting a digital signal control pin CS _ A1 with an address line A1; the third pin of the voltage isolator is connected with the output end OUTA, the first pin of the voltage isolator is connected with the second pin and outputs a signal AIN1+, the fifth pin of the voltage isolator is connected with the output end OUTB, and the sixth pin of the voltage isolator is connected with the seventh pin and outputs a signal AIN2 +.
Further, the decoupling capacitor comprises a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C4, and the capacitor C1, the capacitor C2, the capacitor C3 and the capacitor C4 are respectively arranged between the power supply voltage VCC and the ground.
Furthermore, the double power supplies of the power supply voltage of the multi-path direct current acquisition multiplexing circuit based on the analog switch are +/-5V-22V.
Further, the switching time of the analog switch-based multi-channel direct current acquisition multiplexing circuit is 200ns and 250ns respectively.
Further, the two-way four-channel CMOS analog multiplexer is model MPC509 AU.
Further, the voltage isolator is in the model of OPA2277 UA.
Further, the capacitance of the capacitor C1, the capacitor C2, the capacitor C3 and the capacitor C4 is 0.1 μ F.
The utility model provides a multichannel direct current gathers multiplexing circuit based on analog switch compares with prior art, has following beneficial effect at least:
the utility model discloses can practice thrift analog-to-digital converter port resource, hardware circuit is simple, and input impedance is high, is favorable to realizing the miniaturization and the reduce cost of equipment.
Drawings
In order to illustrate the solution of the present invention more clearly, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained without inventive work.
Fig. 1 is a circuit diagram of a two-way four-channel CMOS analog multiplexer of a multi-way dc acquisition multiplexing circuit based on an analog switch according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a voltage isolator of a multi-path dc acquisition multiplexing circuit based on an analog switch according to an embodiment of the present invention.
Detailed Description
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs; the terminology used herein in the description is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention, for example, the terms "length," "width," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc. refer to an orientation or position illustrated in the drawings, which are for convenience of description only and are not to be construed as limiting of the present disclosure.
The terms "including" and "having," and any variations thereof, in the description and claims of this invention and the description of the above figures are intended to cover non-exclusive inclusions; the terms "first," "second," and the like in the description and in the claims, or in the drawings, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. In the description and claims of the present invention and in the description of the above figures, when an element is referred to as being "fixed" or "mounted" or "disposed" or "connected" to another element, it can be directly or indirectly located on the other element. For example, when an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element.
Furthermore, reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The utility model provides a multichannel direct current gathers multiplexing circuit based on analog switch, include:
the double-path four-channel CMOS analog multiplexer, the voltage isolator and the decoupling capacitor; the two-way four-channel CMOS analog multiplexer comprises an address line A0, an address line A1, an enable end EN, a chip digital Ground end group, a power supply section + V, a power supply section-V, a two-way four-one-out-of-one COMS analog switch, an output end OUTA and an output end OUTB; the first path of the two-path four-selection CMOS analog switch is a pin IN1A, a pin IN2A, a pin IN3A and a pin IN4A, the second path of the two-path four-selection CMOS analog switch is a pin IN1B, a pin IN2B, a pin IN3B and a pin IN4B, and the control of the two-path four-channel CMOS analog multiplexer is realized by connecting a digital signal control pin CS _ A0 with an address line A0 and connecting a digital signal control pin CS _ A1 with an address line A1; a third pin of the voltage isolator is connected with an output end OUTA, a first pin of the voltage isolator is connected with a second pin and outputs a signal AIN1+, a fifth pin of the voltage isolator is connected with an output end OUTB, and a sixth pin of the voltage isolator is connected with a seventh pin and outputs a signal AIN2 +; the decoupling capacitor comprises a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C4, wherein the capacitor C1, the capacitor C2, the capacitor C3 and the capacitor C4 are respectively arranged between the power supply voltage VCC and the ground.
The utility model discloses can practice thrift analog-to-digital converter port resource, hardware circuit is simple, and input impedance is high, is favorable to realizing the miniaturization and the reduce cost of equipment.
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
The utility model provides a multichannel direct current acquisition multiplexing circuit of analog switch, as shown in figure 1, include: the double-path four-channel CMOS analog multiplexer, the voltage isolator and the decoupling capacitor; the two-way four-channel CMOS analog multiplexer comprises an address line A0, an address line A1, an enable end EN, a chip digital Ground end group, a power supply section + V, a power supply section-V, a two-way four-one-out-of-one COMS analog switch, an output end OUTA and an output end OUTB; the first path of the two-path four-selection CMOS analog switch is a pin IN1A, a pin IN2A, a pin IN3A and a pin IN4A, the second path of the two-path four-selection CMOS analog switch is a pin IN1B, a pin IN2B, a pin IN3B and a pin IN4B, and the control of the two-path four-channel CMOS analog multiplexer is realized by connecting a digital signal control pin CS _ A0 with an address line A0 and connecting a digital signal control pin CS _ A1 with an address line A1; the third pin of the voltage isolator is connected with the output end OUTA, the first pin of the voltage isolator is connected with the second pin and outputs a signal AIN1+, the fifth pin of the voltage isolator is connected with the output end OUTB, and the sixth pin of the voltage isolator is connected with the seventh pin and outputs a signal AIN2 +.
Further, in this embodiment, the decoupling capacitor includes a capacitor C1, a capacitor C2, a capacitor C3, and a capacitor C4, and the capacitor C1, the capacitor C2, the capacitor C3, and the capacitor C4 are respectively disposed between the power voltage VCC and the ground.
Furthermore, in the embodiment, the dual power supply voltage of the multi-path direct current acquisition multiplexing circuit based on the analog switch is +/-5-22V; the switching times are respectively 200ns and 250 ns; the model of the two-way four-channel CMOS analog multiplexer is MPC509 AU; the model of the voltage isolator is OPA2277 UA; the capacitance of the capacitor C1, the capacitor C2, the capacitor C3 and the capacitor C4 is 0.1 μ F.
Specifically, the distribution automation terminal direct-current sampling input channels VIN _ DC1 to VIN _ DC8 control a two-way four-way CMOS analog switch of the MPC509AU through a direct-current acquisition analog switch MPC509AU and two address lines CS _ a0 and CS _ a1, wherein the first way is a pin IN1A, a pin IN2A, a pin IN3A and a pin IN4A, the second way is a pin IN1B, a pin IN2B, a pin IN3B and a pin IN4B, when CS _ a0 is 0 and CS _ a1 is 0, output terminals OUTA and VIN _ DC1 are closed, and output terminals OUTB and VIN _ DC2 are closed; when CS _ a0 is 0 and CS _ a1 is 1, the output terminals OUTA and VIN _ DC2 are closed, and the output terminals OUTB and VIN _ DC4 are closed; when CS _ a0 is 1 and CS _ a1 is 0, the output terminals OUTA and VIN _ DC3 are closed, and the output terminals OUTB and VIN _ DC6 are closed; when CS _ a0 is 1 and CS _ a1 is 1, the output terminals OUTA and VIN _ DC4 are closed, and the output terminals OUTB and VIN _ DC8 are closed; therefore, direct current acquisition analog quantities VIN _ DC1 to VIN _ DC8 reaching eight channels are converted into single two-channel output AIN1+ and AIN2+ through channel selection signals CS _ A0 and CS _ A1, and multiplexing acquisition of the eight-channel direct current analog quantities is achieved.
Specifically, the collected voltage signal passes through a voltage isolator OPA2277UA, an output end OUTA is connected with a third pin of the voltage isolator circuit, a first pin and a second pin of the voltage isolator OPA2277UA are connected, and a signal AIN1+ is output; the output end OUTB is connected with the fifth pin of the voltage isolator OPA2277UA circuit, the sixth pin of the voltage isolator OPA2277UA is connected with the seventh pin, and a signal AIN2+ is output; the voltage isolator OPA2277UA converts input impedance, and reduces the influence of the AD converter on the signal.
Specifically, the decoupling circuit is composed of four ceramic chip capacitors with the capacitance of 0.1 muF, such as a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4 and the like, so that low-frequency noise is filtered, the transient characteristic of the circuit is improved, and parasitic oscillation caused by a positive feedback path formed by the circuit through a power supply is prevented.
According to the multi-channel direct current acquisition multiplexing circuit based on the analog switch, after the four-channel CMOS analog multiplexing circuit is designed, eight direct current analog quantities can be acquired only by the two-channel AD converters, port resources of the analog-to-digital converter can be saved, a hardware circuit is simple, input impedance is high, and miniaturization and cost reduction of equipment are facilitated.
It is to be understood that the above-described embodiments are merely preferred embodiments of the present invention, rather than all embodiments, and that the appended drawings illustrate preferred embodiments of the invention and do not limit the scope of the invention. The present invention may be embodied in many different forms and, on the contrary, these embodiments are provided so that this disclosure will be thorough and complete. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and modifications can be made, and equivalents may be substituted for elements thereof. All utilize the equivalent structure that the content of the utility model discloses a specification and attached drawing was done, direct or indirect application is in other relevant technical field, all is in the same way the utility model discloses within the patent protection scope.
Claims (7)
1. A multi-channel DC acquisition multiplexing circuit based on an analog switch is characterized by comprising:
the double-path four-channel CMOS analog multiplexer, the voltage isolator and the decoupling capacitor;
the two-way four-channel CMOS analog multiplexer comprises an address line A0, an address line A1, an enable end EN, a chip digital Ground end group, a power supply section + V, a power supply section-V, a two-way four-one-out-one COMS analog switch, an output end OUTA and an output end OUTB; the first path of the two-path one-out-of-four CMOS analog switch is a pin IN1A, a pin IN2A, a pin IN3A and a pin IN4A, the second path of the two-path one-out-of-four CMOS analog switch is a pin IN1B, a pin IN2B, a pin IN3B and a pin IN4B, and the control of the two-path four-channel CMOS analog multiplexer is realized by connecting a digital signal control pin CS _ A0 with an address line A0 and connecting a digital signal control pin CS _ A1 with an address line A1;
the third pin of the voltage isolator is connected with the output end OUTA, the first pin of the voltage isolator is connected with the second pin and outputs a signal AIN1+, the fifth pin of the voltage isolator is connected with the output end OUTB, and the sixth pin of the voltage isolator is connected with the seventh pin and outputs a signal AIN2 +.
2. The analog-switch-based multi-channel direct current acquisition multiplexing circuit of claim 1, wherein the decoupling capacitor comprises a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C4, and the capacitor C1, the capacitor C2, the capacitor C3 and the capacitor C4 are respectively placed between a power supply voltage VCC and ground.
3. The analog switch-based multi-channel direct current acquisition multiplexing circuit of claim 1, wherein the dual power supply voltage of the analog switch-based multi-channel direct current acquisition multiplexing circuit is ± 5V to 22V.
4. The analog-switch-based multi-channel DC acquisition multiplexing circuit of claim 1, wherein the switching time of the analog-switch-based multi-channel DC acquisition multiplexing circuit is 200ns and 250ns respectively.
5. The analog switch-based multi-channel DC acquisition multiplexing circuit of claim 1, wherein the two-way four-channel CMOS analog multiplexer is model MPC509 AU.
6. The analog switch based multi-channel dc acquisition multiplexing circuit of claim 1, wherein the voltage isolator is of type OPA2277 UA.
7. The analog switch-based multi-channel DC acquisition multiplexing circuit of claim 2, wherein the capacitances of the capacitor C1, the capacitor C2, the capacitor C3 and the capacitor C4 are 0.1 μ F.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120395804.1U CN215072348U (en) | 2021-02-23 | 2021-02-23 | Multi-channel direct current acquisition multiplexing circuit based on analog switch |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120395804.1U CN215072348U (en) | 2021-02-23 | 2021-02-23 | Multi-channel direct current acquisition multiplexing circuit based on analog switch |
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| CN215072348U true CN215072348U (en) | 2021-12-07 |
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Address after: 411201 28 Bai Shi Road, Jing Kai District, Xiangtan, Hunan Patentee after: Weisheng Energy Technology Co.,Ltd. Address before: 411201 28 Bai Shi Road, Jing Kai District, Xiangtan, Hunan Patentee before: WASION ELECTRIC Co.,Ltd. |