CN203643498U - Voltage sampling circuit of double supply change-over switch - Google Patents
Voltage sampling circuit of double supply change-over switch Download PDFInfo
- Publication number
- CN203643498U CN203643498U CN201420000953.3U CN201420000953U CN203643498U CN 203643498 U CN203643498 U CN 203643498U CN 201420000953 U CN201420000953 U CN 201420000953U CN 203643498 U CN203643498 U CN 203643498U
- Authority
- CN
- China
- Prior art keywords
- sampling circuit
- operational amplifier
- supply network
- circuit
- resistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Control Of Voltage And Current In General (AREA)
Abstract
The utility model discloses a voltage sampling circuit of a double supply change-over switch. The voltage sampling circuit comprises multiple unit sampling circuits which are connected to a three-phase power supply network; and is characterized in that each unit sampling circuit comprises a pre-stage isolation circuit which comprises two isolating resistors and a difference amplification circuit which comprises an operational amplifier and a load resistor, one end of one isolating resistor is connected with the live line in the three-phase power supply network, the other end of the isolating resistor is connected with the anti-phase input end of the operational amplifier, one end of the other isolating resistor is connected with the zero line in the three-phase power supply network, the other end of the isolating resistor is connected with the in-phase input end of the operational amplifier, the load resistor is connected in series between the anti-phase input end and the output end of the operational amplifier, and the output end of the operational amplifier is connected with a single-chip microcomputer. The sampling circuit is high in sampling precision and strong in anti-interference capability, and can ensure accurate and stable motion of the double supply change-over switch.
Description
Technical field
The utility model relates to a kind of voltage sampling circuit for dual-power transfer switch.
Background technology
Dual-power transfer switch is the important electrical equipment in distribution system, conventional power supply and the standby power supply two-way power supply of general switch access three-phase power supply system, and can between two-way power supply, automatically switch, thereby guarantee continuity and the reliability of powering.Dual-power transfer switch switches when action making, and first collect the voltage real-time change situation on two-way power supply, makes corresponding action again after the signal collecting is passed to control gear by control gear according to signal controlling switch.On dual-power transfer switch, the voltage of power supply being carried out to real-time sampling at present realizes by transformer, but transformer not only volume is larger, cost is higher, and be easily subject to the impact of the external environments such as temperature, thereby cause the signal that collects not accurate enough, the action that switch is done make mistake.
Summary of the invention
For the deficiencies in the prior art, problem to be solved in the utility model is to provide a kind of can being used in conjunction with single-chip microcomputer, and antijamming capability is strong and make the voltage sampling circuit of the more accurate dual-power transfer switch of collection result.
For this reason, the utility model is realized in the following way: a kind of voltage sampling circuit of dual-power transfer switch, comprise the unit sampling circuit of some access three phase supply networks, it is characterized in that: described unit sampling circuit comprises prime buffer circuit and differential amplifier circuit, described prime buffer circuit comprises two isolation resistances, described differential amplifier circuit comprises operational amplifier and pull-up resistor, isolation resistance one end described in one of them is connected with the live wire in three phase supply network, the other end is connected with the inverting input of operational amplifier, isolation resistance one end described in another is connected with the zero line in three phase supply network, the other end is connected with the in-phase input end of operational amplifier, described pull-up resistor is connected between the inverting input and output terminal of operational amplifier, the output terminal of described operational amplifier is connected with single-chip microcomputer.
Comprise the unit sampling circuit described in six groups, wherein three groups of unit sampling circuit access respectively the three-way power of commonly using three phase supply network, and other three groups of unit sampling circuit access respectively the three-way power of three phase supply network for subsequent use.
In the utility model, first the forceful electric power voltage coming from the three phase supply network of access dual-power transfer switch change a weak electric signal for millivolt level into through the isolation of two isolation resistances, then by differential amplifier circuit, this signal is amplified, again this signal is delivered to single-chip microcomputer, make corresponding action by single-chip microcomputer according to the voltage signal control switch collecting.This voltage sampling circuit sampling precision is high, and antijamming capability is strong, can guarantee that switch there will not be to misroute to change.The utility model and like product relatively have following superiority: 1. impedance is large, can arrive 4 megaohms, and human body can touch back-end circuit; 2. measuring accuracy is high, can reach 5%; 3. cost is low, and good reliability can be promoted in batches.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of unit sampling circuit in the utility model;
Fig. 2 is circuit diagram of the present utility model.
Embodiment
Shown in Fig. 1, the voltage sampling circuit of this dual-power transfer switch, comprise the unit sampling circuit of access three phase supply network, described unit sampling circuit comprises prime buffer circuit 1 and differential amplifier circuit 2, described prime buffer circuit 1 comprises two isolation resistance R15, R12, described differential amplifier circuit 2 comprises operational amplifier U5C and pull-up resistor R22, described isolation resistance R15 one end is connected with the live wire in three phase supply network, the other end is connected with the inverting input of operational amplifier U5C, described isolation resistance R12 one end is connected with the zero line in three phase supply network, the other end is connected with the in-phase input end of operational amplifier U5C, described pull-up resistor R22 is connected between the inverting input and output terminal of operational amplifier U5C, the output terminal of described operational amplifier U5C is connected with single-chip microcomputer, as shown in Figure 2, the voltage sampling circuit of this dual-power transfer switch comprises altogether the unit sampling circuit described in six groups, wherein three groups of unit sampling circuit access respectively the three-way power of commonly using three phase supply network, other three groups of unit sampling circuit access respectively the three-way power of three phase supply network for subsequent use, its concrete connected mode is all identical with the unit sampling circuit access way shown in Fig. 1, just repeats no more here.In above-mentioned sample circuit, adopt voltage follower, set up reference voltage, magnitude of voltage is supply voltage 1/2nd.
In the time that dual-power transfer switch is worked, three groups of unit sampling circuit of the conventional three phase supply network of access can carry out voltage sample to the three-way power of supply network simultaneously, thereby obtain more accurate voltage real-time parameter to feed back to single-chip microcomputer, make single-chip microcomputer can control switch and make correct action, and in the time that switch is switched to stand-by power supply network, three groups of unit sampling circuit on three phase supply network for subsequent use can accurately gather voltage signal equally and feed back to single-chip microcomputer, thereby guarantee that switch must switch action very correctly and duty is very stable.
Claims (2)
1. the voltage sampling circuit of a dual-power transfer switch, comprise the unit sampling circuit of some access three phase supply networks, it is characterized in that: described unit sampling circuit comprises prime buffer circuit and differential amplifier circuit, described prime buffer circuit comprises two isolation resistances, described differential amplifier circuit comprises operational amplifier and pull-up resistor, isolation resistance one end described in one of them is connected with the live wire in three phase supply network, the other end is connected with the inverting input of operational amplifier, isolation resistance one end described in another is connected with the zero line in three phase supply network, the other end is connected with the in-phase input end of operational amplifier, described pull-up resistor is connected between the inverting input and output terminal of operational amplifier, the output terminal of described operational amplifier is connected with single-chip microcomputer.
2. the voltage sampling circuit of dual-power transfer switch according to claim 1, it is characterized in that: comprise the unit sampling circuit described in six groups, wherein three groups of unit sampling circuit access respectively the three-way power of commonly using three phase supply network, and other three groups of unit sampling circuit access respectively the three-way power of three phase supply network for subsequent use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420000953.3U CN203643498U (en) | 2014-01-02 | 2014-01-02 | Voltage sampling circuit of double supply change-over switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420000953.3U CN203643498U (en) | 2014-01-02 | 2014-01-02 | Voltage sampling circuit of double supply change-over switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203643498U true CN203643498U (en) | 2014-06-11 |
Family
ID=50874733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420000953.3U Expired - Fee Related CN203643498U (en) | 2014-01-02 | 2014-01-02 | Voltage sampling circuit of double supply change-over switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203643498U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104166034A (en) * | 2014-08-12 | 2014-11-26 | 成都信息工程学院 | High-precision difference sampling circuit |
| CN104198801A (en) * | 2014-07-14 | 2014-12-10 | 珠海格力电器股份有限公司 | AC voltage sampling circuit and AC voltage sampling method |
-
2014
- 2014-01-02 CN CN201420000953.3U patent/CN203643498U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198801A (en) * | 2014-07-14 | 2014-12-10 | 珠海格力电器股份有限公司 | AC voltage sampling circuit and AC voltage sampling method |
| CN104198801B (en) * | 2014-07-14 | 2017-05-31 | 珠海格力电器股份有限公司 | Alternating voltage sampling circuit and method |
| CN104166034A (en) * | 2014-08-12 | 2014-11-26 | 成都信息工程学院 | High-precision difference sampling circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109387686B (en) | Non-contact voltage measurement circuit | |
| CN104201892A (en) | Method and circuit for detecting input voltage of isolated flyback high-frequency switching power supply | |
| CN203444012U (en) | High accuracy and rapid speed measurement circuit of wide range current in power system | |
| CN203643498U (en) | Voltage sampling circuit of double supply change-over switch | |
| CN203643502U (en) | Full-automatic microcurrent detection device | |
| CN103063905A (en) | Single battery voltage isolation detecting system | |
| CN104062496B (en) | Portable mobile electric testing recorder and optimization method therefor | |
| CN204241537U (en) | A kind of current collection circuit | |
| CN203587634U (en) | Wide-range metering electric energy meter sampling in compound manner | |
| CN104678854A (en) | Remote controller, temperature sampling control system and temperature sampling control method | |
| CN104535875A (en) | Electric power parameter wireless monitoring terminal for dynamic simulation experimental platform of electrical power system | |
| CN206077072U (en) | A kind of electric energy control system based on ADE7755 | |
| CN105092959A (en) | Intelligent power meter and power measuring system | |
| CN204131397U (en) | A kind of input voltage detection circuit of isolating inverse-excitation type high frequency switch power | |
| CN103199574B (en) | A kind of charging device and system | |
| CN203825065U (en) | Circuit used for amplifying input signal of intelligent controller | |
| CN204331350U (en) | The switch arrays circuit of changeable access diverse location battery | |
| CN204287285U (en) | Capture card measured by a kind of multimeter | |
| CN206450739U (en) | A kind of automatic transfer switching electric appliance voltage sampling circuit | |
| CN203385782U (en) | Non-transformer isolated voltage and current acquisition device | |
| CN203455695U (en) | Switch signal input/output extended module | |
| CN105182057A (en) | high precision cell voltage monitoring device | |
| CN104731129A (en) | Remote control unit and temperature sampling control system and method | |
| CN206002585U (en) | Perception for electric fire disaster monitoring and resistive load share signal processor | |
| CN104749546A (en) | Novel type-III specific power transformer acquisition terminal testing device and testing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140611 Termination date: 20180102 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |