CN202976383U - Dual-path one-from-four circuit for multifunctional electric fire monitor - Google Patents
Dual-path one-from-four circuit for multifunctional electric fire monitor Download PDFInfo
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- CN202976383U CN202976383U CN 201220678726 CN201220678726U CN202976383U CN 202976383 U CN202976383 U CN 202976383U CN 201220678726 CN201220678726 CN 201220678726 CN 201220678726 U CN201220678726 U CN 201220678726U CN 202976383 U CN202976383 U CN 202976383U
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Abstract
Disclosed in the utility model is a dual-path one-from-four circuit for a multifunctional electric fire monitor. The circuit comprises a dual-path one-from-four analog switch, three paths of three-phase line voltage signal circuits, and three paths of three-phase line current signal circuits. The outputs of the three paths of three-phase line voltage signal circuits are respectively connected with a first input port of the dual-path one-from-four analog switch; and the outputs of the three paths of three-phase line current signal circuits are respectively connected with a second input port of the dual-path one-from-four analog switch. And the dual-path one-from-four analog switch interruptedly collects voltage signals of the three paths of three-phase line voltage signal circuits and current signals of the three paths of three-phase line current signal circuits one by one. According to the provided circuit, AD conversion pins of a single-chip microcomputer are saved. And due to the utilization of the dual-path one-from-four analog switch, the space of the PCB circuit board in the terms of circuit is saved, so that the circuit is arranged clearly under the circumstances that the function of the circuit is not influenced.
Description
Technical field
The utility model relates to a kind of two-way four for the multifunctional electric fire monitor and selects a circuit.
Background technology
The signals collecting function of existing electric fire alarm is divided into four kinds of residual currents, three-phase current, three-phase voltage, line temperature, generally corresponding AD switched pins of each road collection signal when circuit design.Due to the few quantity that limits collection signal of quantity of the AD switched pins of single-chip microcomputer, thereby limited the function of watch-dog.If the increase function just need to increase AD converter, thereby make circuit complicated and take the PCB circuit board space more on original basis.
The utility model content
For the problems referred to above, the utility model purpose is to provide a kind of two-way four for the multifunctional electric fire monitor and selects a circuit.
For addressing the above problem, the utility model adopts following technical scheme:
A kind of two-way four for the multifunctional electric fire monitor selects a circuit, and it is characterized in that comprising: two-way four selects an analog switch; 3 road three-phase line voltage signal circuits, their output connect respectively the first input end mouth that described two-way four selects an analog switch; 3 tunnel triple-phase line current signal circuit, their output connects respectively the second input port that described two-way four selects an analog switch; Two-way four selects an analog switch to gather one by one incessantly the voltage signal of 3 road three-phase line voltage signal circuit outputs and the current signal of 3 tunnel triple-phase line current signal circuits output.
The utility model has the advantages that: the AD that has saved single-chip microcomputer transforms pin, uses simultaneously 74HC4052D (two-way four selects an analog switch) to save the space of PCB wiring board on circuit, makes circuit more clear and do not affect its function.
Description of drawings
Fig. 1 is that two-way four of the present utility model selects circuit theory diagrams;
Fig. 2, Fig. 3 are the utility model three-phase voltage signal circuit theory diagrams in circuit;
Fig. 4, Fig. 5 are the utility model three-phase current signal circuit theory diagrams in circuit;
Fig. 6 is the utility model composition frame chart.
Embodiment
The utility model relates to a kind of two-way four for the multifunctional electric fire monitor and selects a circuit.
As shown in Figure 6, it comprises: two-way four selects an analog switch; 3 road three-phase line voltage signal circuits, their output connect respectively the first input end mouth that described two-way four selects an analog switch; 3 tunnel triple-phase line current signal circuit, their output connects respectively the second input port that described two-way four selects an analog switch; Two-way four selects an analog switch to gather one by one incessantly the voltage signal of 3 road three-phase line voltage signal circuit outputs and the current signal of 3 tunnel triple-phase line current signal circuits output.Two-way four selects the output of an analog switch to connect single-chip microcomputer.
Further:
the input end of described three-phase line voltage signal circuit connects phase line and zero line, be input to the primary coil of transformer after the first electric resistance partial pressure, two ends series connection second resistance of the secondary coil of transformer, the two ends of the second resistance connect respectively the 3rd resistance and the 4th resistance, the 3rd resistance and the 4th resistance connect respectively the first operational amplifier positive-negative input end, be connected the 6th resistance between the negative input end of the first operational amplifier and output terminal, the 3rd resistance, the 4th resistance, the 6th resistance, the first operational amplifier forms differential amplifier circuit, the positive input terminal of the first operational amplifier also connects the 5th resistance, 2.048V voltage source and the 5th resistance, the first operational amplifier forms threshold voltage circuit, the voltage and the protection components and parts that are used for the restriction input voltage, voltage signal after the first operational amplifier amplifies outputs to the first input end mouth that two-way four selects an analog switch.
Described triple-phase line current signal circuit comprises: current transformer is used for gathering phase current; Amplitude limiter circuit, its secondary two ends with described current transformer are in parallel; Sample resistance, its secondary two ends with described current transformer are in parallel; Voltage follower, its input end is connected with the output of described sample resistance; The second operational amplifier, the positive input terminal of the second operational amplifier connects the output of described voltage follower, the negative input end of the second operational amplifier connects the voltage source of 2.048V, and the signal after the second operational amplifier amplifies is input to the second input port that two-way four selects an analog switch.
The input end of described triple-phase line current signal circuit connects current transformer secondary of phase line, the amplitude limiter circuit that the secondary two ends parallel connection of current transformer is comprised of the stabilivolt of the stabilivolt of a forward connection and a reverse connection, the secondary two ends of current transformer are sample resistance in parallel also, and the sampled signal on sample resistance is input to the positive input terminal of the second operational amplifier by voltage follower.
The voltage source of described 2.048V is comprised of the voltage follower circuit that reference source REF3020 and amplifier LM258 form, and forms the voltage source of the low output impedance of a 2.048V.
Be described further below in conjunction with accompanying drawing.
Figure 1 shows that two-way four selects a circuit (the actual use is the two-way one-out-three), EN connects low level, 52-A (10 pin) and 52-B (9 pin) are the gating control end, and 52-X (13 pin), 52-Y (3 pin) are output terminal, connect the Chip Microcomputer A/D switched pins.Wherein:
Ua (12 pin), Ub (14 pin), Uc (15 pin) are the three-phase voltage signal input pin, are subjected to the control of 52-A, 52-B, output to the AD switched pins of single-chip microcomputer by 52-X.Ia (1 pin), Ib (5 pin), Ic (2 pin) are the three-phase current signal input end, are subjected to the control of 52-A, 52-B, output to the AD switched pins of single-chip microcomputer by 52-Y.
As shown in Figure 2, circuit adopts reference source REF3020 and amplifier LM258 to form the voltage source that voltage follower circuit produces the low output impedance of a 2.048V.
Figure 3 shows that 3 road signal acquisition circuits of three-phase line voltage, in figure, the input end of the signal acquisition circuit of A phase voltage is A phase line and zero line, be input to after the 1R1 dividing potential drop in transformer T1, if the inductive coil of T1 produces induced voltage u, the inductive coil internal resistance is r, and the electric potential difference at 1R2 two ends is 50u/ (r+50).1R3,1R4,1R6, U1A form differential amplifier circuit.2.048V voltage source and 1R5, U1A form threshold voltage circuit, be used for the voltage of restriction input voltage, the protection components and parts, the voltage signal after amplification is input to by 1R7 12 pin that two-way four selects an analog switch.
Identical with the A phase line, the voltage signal of B, C phase line is input to 14,15 pin that two-way four selects an analog switch.
As shown in Figure 4, circuit adopts REF3020 and amplifier LM258 to form the voltage source that voltage follower circuit produces the low output impedance of a 2.048V.
Figure 5 shows that 3 road signal acquisition circuits of triple-phase line electric current, in figure, the input end of the signal acquisition circuit of A phase current is the input and output side of the primary current mutual inductor of A phase line, T1 is the secondary current mutual inductor, 2D1 and 2D2 form amplitude limiter circuit, prevent the excessive amplifier that burns out of input signal, 2R1, 2R2 (preventing the excessive resistance that burns out of electric current) in parallel forms sample resistance, if the inductive coil of T1 produces induced voltage u, the inductive coil internal resistance is r, sample resistance two ends electric potential difference is 75u/ (r+75), sampled signal passes through 2R3, the voltage follower that 2U1A forms is input to by 2R5, 2R6, 2R7, the operational amplification circuit that 2U1B forms, enlargement factor is 2R7/2R6, current signal after amplification is input to through 2R8 1 pin that two-way four selects an analog switch.
Identical with the A phase line, the current signal input two-way four of B, C phase line selects 5,2 pin of an analog switch.
Use two-way four to select the pin resource of both rationally having used single-chip microcomputer after a circuit, also make gating circuit clear simultaneously, reduced the space hold rate of pcb board.
Claims (5)
1. a two-way four that is used for the multifunctional electric fire monitor selects a circuit, it is characterized in that comprising:
Two-way four selects an analog switch;
3 road three-phase line voltage signal circuits, their output connect respectively the first input end mouth that described two-way four selects an analog switch;
3 tunnel triple-phase line current signal circuit, their output connects respectively the second input port that described two-way four selects an analog switch;
Two-way four selects an analog switch to gather one by one incessantly the voltage signal of 3 road three-phase line voltage signal circuit outputs and the current signal of 3 tunnel triple-phase line current signal circuits output.
2. the two-way four for the multifunctional electric fire monitor as claimed in claim 1 selects a circuit, it is characterized in that:
the input end of described three-phase line voltage signal circuit connects phase line and zero line, be input to the primary coil of transformer after the first electric resistance partial pressure, two ends series connection second resistance of the secondary coil of transformer, the two ends of the second resistance connect respectively the 3rd resistance and the 4th resistance, the 3rd resistance and the 4th resistance connect respectively the first operational amplifier positive-negative input end, be connected the 6th resistance between the negative input end of the first operational amplifier and output terminal, the 3rd resistance, the 4th resistance, the 6th resistance, the first operational amplifier forms differential amplifier circuit, the positive input terminal of the first operational amplifier also connects the 5th resistance, 2.048V voltage source and the 5th resistance, the first operational amplifier forms threshold voltage circuit, the voltage and the protection components and parts that are used for the restriction input voltage, voltage signal after the first operational amplifier amplifies outputs to the first input end mouth that two-way four selects an analog switch.
3. the two-way four for the multifunctional electric fire monitor as claimed in claim 1 selects a circuit, it is characterized in that:
Described triple-phase line current signal circuit comprises:
Current transformer is used for gathering phase current;
Amplitude limiter circuit, its secondary two ends with described current transformer are in parallel;
Sample resistance, its secondary two ends with described current transformer are in parallel;
Voltage follower, its input end is connected with the output of described sample resistance;
The second operational amplifier, the positive input terminal of the second operational amplifier connects the output of described voltage follower, the negative input end of the second operational amplifier connects the voltage source of 2.048V, and the signal after the second operational amplifier amplifies is input to the second input port that two-way four selects an analog switch.
4. the two-way four for the multifunctional electric fire monitor as claimed in claim 3 selects a circuit, it is characterized in that:
The input end of described triple-phase line current signal circuit connects current transformer secondary of phase line, the amplitude limiter circuit that the secondary two ends parallel connection of current transformer is comprised of the stabilivolt of the stabilivolt of a forward connection and a reverse connection, the secondary two ends of current transformer are sample resistance in parallel also, and the sampled signal on sample resistance is input to the positive input terminal of the second operational amplifier by voltage follower.
5. the two-way four that is used for as claimed in claim 2 or claim 3 the multifunctional electric fire monitor selects a circuit, it is characterized in that:
The voltage source of described 2.048V is comprised of the voltage follower circuit that reference source REF3020 and amplifier LM258 form, and forms the voltage source of the low output impedance of a 2.048V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220678726 CN202976383U (en) | 2012-12-10 | 2012-12-10 | Dual-path one-from-four circuit for multifunctional electric fire monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220678726 CN202976383U (en) | 2012-12-10 | 2012-12-10 | Dual-path one-from-four circuit for multifunctional electric fire monitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202976383U true CN202976383U (en) | 2013-06-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220678726 Expired - Lifetime CN202976383U (en) | 2012-12-10 | 2012-12-10 | Dual-path one-from-four circuit for multifunctional electric fire monitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202976383U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106353558A (en) * | 2016-08-26 | 2017-01-25 | 成都鑫豪斯电子探测技术有限公司 | The co-signal processor of inductive load and resistive load used for electrical fire supervision |
| CN107733384A (en) * | 2017-11-21 | 2018-02-23 | 雷顿电气科技有限公司 | Folk art term bit arithmetic amplifier circuit |
-
2012
- 2012-12-10 CN CN 201220678726 patent/CN202976383U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106353558A (en) * | 2016-08-26 | 2017-01-25 | 成都鑫豪斯电子探测技术有限公司 | The co-signal processor of inductive load and resistive load used for electrical fire supervision |
| CN107733384A (en) * | 2017-11-21 | 2018-02-23 | 雷顿电气科技有限公司 | Folk art term bit arithmetic amplifier circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130605 |