CN203250174U - Voltage measure circuit and automatic change-over switch controller - Google Patents
Voltage measure circuit and automatic change-over switch controller Download PDFInfo
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- CN203250174U CN203250174U CN 201320273851 CN201320273851U CN203250174U CN 203250174 U CN203250174 U CN 203250174U CN 201320273851 CN201320273851 CN 201320273851 CN 201320273851 U CN201320273851 U CN 201320273851U CN 203250174 U CN203250174 U CN 203250174U
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Abstract
The utility model provides a voltage measure circuit and an automatic change-over switch controller. The voltage measure circuit comprises the following parts: a first to a third pulse resistor string, and each pulse resistor string has a same structure and comprises a plurality of pulse resistors in series connection, and each first terminal of the first to the third pulse resistor string is respectively connected with a first phase to a third phase of a power supply; a first to a third isolation capacitor, and each isolation capacitor has a same capacitance value, a first terminal of the first to the third isolation capacitor is respectively connected to a second terminal of the first to the third pulse resistor string; and a line voltage calculating portion, and a first to a third input terminal of the line voltage calculating portion is respectively connected to a second terminal of the first to the third isolation capacitor, and the first to the third output terminal respectively output a line voltage measured value representing a line voltage between a first phase and a second phase, a second line voltage measured value representing a line voltage between the first phase and a third phase, and a second line voltage measured value representing a line voltage between the second phase and the third phase.
Description
Technical field
The utility model relates to automatic change over (Automatic Transfer Switch) field, the automatic transfer switch controller that relates more specifically to a kind of tension measuring circuit for automatic change over and equipped this tension measuring circuit.
Background technology
Generally, automatic change over connects power supply commonly used (for example public electric wire net power supply) and the standby power supply two-way power supply in the electric power system, and can automatically change between this two-way power supply according to the voltage condition of this two-way power supply.
The on-off controller of existing automatic change over generally includes and separates adapter part and the controller part that realizes.In the adapter part, for the every road power supply in the described two-way power supply linear transformer is installed respectively, in order to the three-phase voltage of every road power supply is transformed to respectively lower detection three-phase voltage, for example, 220V or 400V AC voltage conversion are arrived the 20V alternating voltage.Then, the detection that obtains from every road power conversion is imported into the controller part with three-phase voltage, the controller part is carried out necessary voltage-regulation and AD conversion to the detection of the power supply commonly used of input with three-phase voltage, the detection of standby power supply to input is carried out voltage-regulation and AD conversion with three-phase voltage, and determines whether to commonly use the automatic conversion between power supply and the standby power supply.
This shows that the automatic conversion of existing automatic change over is subject to the impact of the voltage measurement precision of power supply commonly used and standby power supply easily.The voltage measurement precision of power supply commonly used and standby power supply depends on the conversion precision of linear transformer to a great extent, yet, the limited and difficult calibration of the range of linearity of known linear transformer.In other words, in existing automatic change over, the voltage measurement precision of power supply commonly used and standby power supply is good not.
On the other hand, owing to need to carry out mutually the linear voltage conversion to power supply commonly used and standby power supply every, therefore correspondingly need the every mutually hookup wire transformer to power supply commonly used and standby power supply, thus in the double power supply automatic transfer switch situation, need altogether 6 linear transformers in the adapter part, this has increased volume and the manufacturing cost of adapter part greatly.
Therefore, need a kind of novel tension measuring circuit that is used for automatic change over, it has higher voltage measurement precision, and has very little volume and manufacturing cost.
The utility model content
Consider the problems referred to above, proposed the utility model.The purpose of this utility model is to provide a kind of tension measuring circuit for automatic change over and automatic transfer switch controller, and it has higher voltage measurement precision, and has very little volume and manufacturing cost.
According to one side of the present utility model, a kind of tension measuring circuit for automatic change over is provided, comprise: the first to the 3rd pulse resistance device string, each pulse resistance device string has same structure and comprises a plurality of pulse resistance devices that are connected in series, the first end of the first pulse resistance device string connects the first-phase of power supply, the first end of the second pulse resistance device string connects the second-phase of power supply, the first end of the 3rd pulse resistance device string connects the third phase of power supply, and described power supply is three-phase supply; The first to the 3rd blocking capacitor, each blocking capacitor has identical capacitance values, the first end of the first blocking capacitor connects the second end of the first pulse resistance device string, the first end of the second blocking capacitor connects the second end of the second pulse resistance device string, and the first end of the 3rd blocking capacitor connects the second end of the 3rd pulse resistance device string; And line voltage calculating section, its first input end connects the second end of described the first blocking capacitor, the second input end connects the second end of described the second blocking capacitor, the 3rd input end connects the second end of described the 3rd blocking capacitor, and the First Line voltage measuring value of the line voltage between its first output terminal output described first-phase of expression and the second-phase, the second line voltage measurement value of the line voltage between its second output terminal output described first-phase of expression and the third phase, with and the 3rd output terminal output described second-phase of expression and third phase between the 3rd line voltage measurement value of line voltage.
According on the other hand of the present utility model, a kind of automatic transfer switch controller is provided, comprising: be used for the first tension measuring circuit of the voltage of measurement the first voltage source, this first tension measuring circuit adopts aforesaid tension measuring circuit; The one AD conversion fraction is used for First Line voltage measuring value, the second line voltage measurement value and the 3rd line voltage measurement value of described the first tension measuring circuit output are transformed to respectively First Line voltage digital value, the second line voltage digital value and the 3rd line voltage digital value; Be used for the second voltage metering circuit of the voltage in measurement second voltage source, this second voltage metering circuit adopts aforesaid tension measuring circuit; The 2nd AD conversion fraction is used for First Line voltage measuring value, the second line voltage measurement value and the 3rd line voltage measurement value of described second voltage metering circuit output are transformed to respectively the 4th line voltage digital value, the 5th line voltage digital value and the 6th line voltage digital value; And controller, be used for First Line voltage digital value, the second line voltage digital value and the 3rd line voltage digital value according to described the first voltage source, and the 4th line voltage digital value in described second voltage source, the 5th line voltage digital value and the 6th line voltage digital value are controlled described automatic change over and are automatically changed between the first voltage source that accesses and second voltage source.
Voltage detecting circuit and automatic transfer switch controller according to the utility model embodiment, utilize simple Pulse Electric depressor string to replace linear transformer, all focus on voltage detecting function in the automatic transfer switch controller, reduce manufacturing cost and the volume of automatic change over, and also improved the voltage detecting precision.
Description of drawings
By being described with reference to the drawings according to the utility model embodiment, the various feature and advantage of the utility model embodiment will be more obvious, and also easier being understood, in the accompanying drawings:
Fig. 1 schematically shows voltage measurement scheme of the prior art;
Fig. 2 schematically shows the voltage measurement scheme according to the utility model embodiment;
Fig. 3 schematically shows the tension measuring circuit according to the utility model embodiment;
Fig. 4 A and Fig. 4 B show the schematic example circuit diagram according to the line voltage calculating section among the utility model embodiment; And
Fig. 5 schematically shows the formation block diagram according to the automatic transfer switch controller among the utility model embodiment.
Embodiment
At first, as shown in Figure 1, schematically show voltage measurement scheme of the prior art.As previously mentioned, the on-off controller of existing automatic change over comprises adapter part and the controller part of separating realization.In the adapter part, utilize linear transformer that the three-phase voltage of every road power supply is transformed to respectively lower detection three-phase voltage, for example, 220V or 400V AC voltage conversion are arrived the 20V alternating voltage.Then, in the controller part, the controller part is carried out necessary voltage-regulation and AD conversion to the power supply commonly used of input and the detection of standby power supply with three-phase voltage, and determines whether to commonly use the automatic conversion between power supply and the standby power supply.
Yet, because the range of linearity of linear transformer is limited and be difficult to calibration, so that the voltage measurement precision of power supply commonly used and standby voltage is affected.On the other hand, because the volume of linear transformer is large and involve great expense, so that the volume of existing automatic change over and manufacturing cost are relatively large.
For the problems referred to above, the utility model proposes a kind of tension measuring circuit and automatic transfer switch controller.Below with reference to 2-5 below with reference to the accompanying drawings tension measuring circuit and automatic transfer switch controller according to the utility model embodiment are described.
As shown in Figure 2, schematically show voltage measurement scheme according to the utility model embodiment.According to the utility model embodiment, different from voltage measurement scheme of the prior art, in the adapter part, do not recycle linear transformer high alternating voltage is converted to the low alternating voltage that detects usefulness, but realize that in the controller part high alternating voltage is to the conversion of low alternating voltage, low alternating voltage to the conversion and control of AD conversion with conversion, AD conversion and the automatic change over of voltage.
As shown in Figure 3, schematically show the tension measuring circuit according to the utility model embodiment, it is included in the automatic transfer switch controller fully.
Tension measuring circuit according to the utility model embodiment comprises: the first to the 3rd pulse resistance device string 10A-10C, the first to the 3rd blocking capacitor 11A-11C and line voltage calculating section 12.
Each pulse resistance device string among the first to the 3rd pulse resistance device string 10A-10C has same structure and comprises a plurality of pulse resistance devices that are connected in series.The pulse resistance device has good linear properties, good homogeneity as standardized component, and does not need to be customized or to calibrate.In addition, the pulse resistance device is also realized Surge suppression easily.
The first end of the first pulse resistance device string 10A connects the first-phase U1A of power supply, and the first end of the second pulse resistance device string 10B connects the second-phase U1B of power supply, and the first end of the 3rd pulse resistance device string 10C connects the third phase U1C of power supply.Described power supply is three-phase supply.
Each blocking capacitor among the first to the 3rd blocking capacitor 11A-11C has identical capacitance values, the first end of the first blocking capacitor 11A connects the second end of the first pulse resistance device string 10A, the first end of the second blocking capacitor 11B connects the second end of the second pulse resistance device string 10B, and the first end of the 3rd blocking capacitor 11C connects the second end of the 3rd pulse resistance device string 10C.
The first input end 1A of line voltage calculating section 12 connects the second end of described the first blocking capacitor 11A, the second input end 1B connects the second end of described the second blocking capacitor 11B, the 3rd input end 1C connects the second end of described the 3rd blocking capacitor 11C, and the First Line voltage measuring value u1ab of the line voltage between its first output terminal 1AB output described first-phase of expression and the second-phase, the second line voltage measurement value u1ac of the line voltage between the described first-phase of its second output terminal 1AC output expression and the third phase, with and the 3rd output terminal 1CB output described second-phase of expression and third phase between the 3rd line voltage measurement value u1cb of line voltage
Compare with the automatic transfer switch controller of prior art, utilize the first to the 3rd pulse resistance device string to substitute three linear transformers, greatly reduce volume and the manufacturing cost of tension measuring circuit, and also improved simultaneously the voltage measurement precision.According to the manufacturing cost of tension measuring circuit of the present utility model only be tension measuring circuit of the prior art manufacturing cost 8%.
Shown in Fig. 4 A and 4B, show the schematic example circuit diagram according to the line voltage calculating section of the utility model embodiment.
In Fig. 4 A and Fig. 4 B, with identical among Fig. 3 A, 1A represents the first input end of line voltage calculating section, 1B represents the second input end of line voltage calculating section, 1C represents the 3rd input end of line voltage calculating section, 1AB represents the first output terminal of line voltage calculating section, and 1AC represents the second output terminal of line voltage calculating section, and 1CB represents the 3rd output terminal of line voltage calculating section.
Shown in Fig. 4 A, line voltage calculating section can comprise the first differential amplifier 13AB, the second differential amplifier 13AC and the 3rd differential amplifier 13CB.
The in-phase input end of the first differential amplifier 13AB connects the second end of described the first blocking capacitor 11A as the first input end 1A of described line voltage calculating section, its inverting input connects the second end of described the second blocking capacitor 11B as the second input end 1B of described line voltage calculating section, and its output terminal is exported described First Line voltage measuring value as the first output terminal 1AB of described line voltage calculating section.
The in-phase input end of the second differential amplifier 13AC and the in-phase input end of described the first differential amplifier 13AB are connected and connect the second end of described the first blocking capacitor 11A, its inverting input connects the second end of described the 3rd blocking capacitor 11C as the 3rd input end 1C of described line voltage calculating section, and its output terminal is exported described the second line voltage measurement value as the second output terminal 1AC of described line voltage calculating section.
The in-phase input end of the 3rd differential amplifier 13CB connects the output terminal of described the first differential amplifier 13AB, its inverting input connects the output terminal of described the second differential amplifier 13AC, and its output terminal is exported described the 3rd line voltage measurement value as the 3rd output terminal 1CB of described line voltage calculating section.
Those skilled in the art can require to select the resistor R1 shown in Fig. 4 A to the concrete resistance value of R4 according to specific design, and the present invention is not subject to the restriction of selected concrete resistance value.
Shown in Fig. 4 B, line voltage calculating section can comprise the first differential amplifier 13 ' AB, the second differential amplifier 13 ' AC and the 3rd differential amplifier 13 ' CB.
The in-phase input end of the first differential amplifier 13 ' AB connects the second end of described the first blocking capacitor 11A as the first input end 1A of described line voltage calculating section, its inverting input connects the second end of described the second blocking capacitor 11B as the second input end 1B of described line voltage calculating section, and its output terminal is exported described First Line voltage measuring value as the first output terminal 1AB of described line voltage calculating section.
The in-phase input end of the second differential amplifier 13 ' AC and the in-phase input end of described the first differential amplifier 13AB are connected and connect the second end of described the first blocking capacitor 11A, its inverting input connects the second end of described the 3rd blocking capacitor 11C as the 3rd input end 1C of described line voltage calculating section, and its output terminal is exported described the second line voltage measurement value as the second output terminal 1AC of described line voltage calculating section.
The in-phase input end of the 3rd differential amplifier 13 ' CB is connected with the inverting input of described the second differential amplifier 13 ' AC, its inverting input is connected with the inverting input of described the first differential amplifier 13 ' AB, and its output terminal is exported described the 3rd line voltage measurement value as the 3rd output terminal 1CB of described line voltage calculating section.
Those skilled in the art can require to select the resistor R5 shown in Fig. 4 B to the concrete resistance value of R7 according to specific design, and the present invention is not subject to the restriction of selected concrete resistance value.
Described First Line voltage measuring value, described the second line voltage measurement value and described the 3rd line voltage measurement value are AD conversion voltage, preferably arrive in the 3.3V scope 0.
For example, described tension measuring circuit can be with the 220V(effective value) AC voltage conversion to 0 to 3.3V, particularly, general-311V～311V(instantaneous value) AC voltage conversion to 0～3.3V.Except said elements, those skilled in the art can add other element with general-311V～311V(instantaneous value as required in described tension measuring circuit) AC voltage conversion to 0～3.3V, the utility model does not limit this physical circuit elements combination mode.
In addition, although it is not shown in Figure 3, tension measuring circuit according to the utility model embodiment can also comprise the AD conversion fraction, and it is used for described First Line voltage measuring value, the second line voltage measurement value and the 3rd line voltage measurement value are transformed to respectively First Line voltage digital value, the second line voltage digital value and the 3rd line voltage digital value.
Although in Fig. 3, Fig. 4 A and Fig. 4 B, show First Line voltage u1ab, the second line voltage u1ac and the 3rd line voltage u1cb, but it will be understood by a person skilled in the art that, be not limited to above order, can be First Line voltage u1ab, the second line voltage u1bc and the 3rd line voltage u1ca etc.
Then, be described with reference to Figure 5 automatic transfer switch controller 50 according to the utility model embodiment.
Automatic transfer switch controller 50 according to the utility model embodiment comprises: the first tension measuring circuit 51, an AD conversion fraction 52, second voltage metering circuit 53, the 2nd AD conversion fraction 54 and controller 55.
The structure and parameters of described the first tension measuring circuit 51 and described second voltage metering circuit 53 is identical.The structure and parameters of the one AD conversion fraction 52 and the 2nd AD conversion fraction 54 is identical.
Described the first tension measuring circuit 51 and described second voltage metering circuit 53 can adopt the tension measuring circuit shown in Fig. 3 and Fig. 4 A simultaneously.Alternatively, described the first tension measuring circuit 51 and described second voltage metering circuit 53 can adopt the tension measuring circuit shown in Fig. 3 and Fig. 4 B simultaneously.
The first tension measuring circuit 51 is used for measuring the voltage of the first voltage source.Described the first voltage source can be the power supply commonly used of three-phase.Particularly, the first tension measuring circuit can comprise: the first to the 3rd pulse resistance device string, the first to the 3rd blocking capacitor and First Line voltage calculating section.
Second voltage metering circuit 53 is used for measuring the voltage in second voltage source.Described second voltage source can be the standby power supply of three-phase.Particularly, the second voltage metering circuit can comprise: the 4th to the 6th pulse resistance device string, the 4th to the 6th blocking capacitor and the second line voltage calculating section.
Each pulse resistance device string has same structure and comprises a plurality of pulse resistance devices that are connected in series of equal number in described the first to the 6th pulse resistance device string.The first end of the first pulse resistance device string connects the first-phase of the first voltage source, the first end of the second pulse resistance device string connects the second-phase of the first voltage source, the first end of the 3rd pulse resistance device string connects the third phase of the first voltage source, the first end of the 4th pulse resistance device string connects the first-phase in second voltage source, the first end of the 5th pulse resistance device string connects the second-phase in second voltage source, and the first end of the 6th pulse resistance device string connects the third phase in second voltage source.
Each blocking capacitor in the first to the 6th blocking capacitor has identical capacitance values, the first end of the first blocking capacitor connects the second end of the first pulse resistance device string, the first end of the second blocking capacitor connects the second end of the second pulse resistance device string, the first end of the 3rd blocking capacitor connects the second end of the 3rd pulse resistance device string, the first end of the 4th blocking capacitor connects the second end of the 4th pulse resistance device string, the first end of the 5th blocking capacitor connects the second end of the 5th pulse resistance device string, and the first end of the 6th blocking capacitor connects the second end of the 6th pulse resistance device string.
The first input end of First Line voltage calculating section connects the second end of described the first blocking capacitor, the second input end connects the second end of described the second blocking capacitor, the 3rd input end connects the second end of described the 3rd blocking capacitor, and the first-phase of described the first voltage source of its first output terminal output expression and the First Line voltage measuring value of the line voltage between the second-phase, the first-phase of described the first voltage source of its second output terminal output expression and the second line voltage measurement value of the line voltage between the third phase, with and the second-phase of described the first voltage source of the 3rd output terminal output expression and the 3rd line voltage measurement value of the line voltage between the third phase.
The first input end of the second line voltage calculating section connects the second end of described the 4th blocking capacitor, the second input end connects the second end of described the 5th blocking capacitor, the 3rd input end connects the second end of described the 6th blocking capacitor, and the first-phase in the described second voltage of its first output terminal output expression source and the 4th line voltage measurement value of the line voltage between the second-phase, the first-phase in the described second voltage of its second output terminal output expression source and the 5th line voltage measurement value of the line voltage between the third phase, with and the second-phase in the described second voltage of the 3rd output terminal output expression source and the 6th line voltage measurement value of the line voltage between the third phase.
Described First Line voltage calculating section and described the second line voltage calculating section can adopt the line voltage counting circuit shown in Fig. 4 A simultaneously.Alternatively, described First Line voltage calculating section and described the second line voltage calculating section can adopt the line voltage counting circuit shown in Fig. 4 B simultaneously.
The one AD conversion fraction 52 is transformed to respectively First Line voltage digital value, the second line voltage digital value and the 3rd line voltage digital value with described First Line voltage measuring value, the second line voltage measurement value and the 3rd line voltage measurement value.
The 2nd AD conversion fraction 54 is transformed to respectively the 4th line voltage digital value, the 5th line voltage digital value and the 6th line voltage digital value with described the 4th line voltage measurement value, the 5th line voltage measurement value and the 6th line voltage measurement value.
Controller 55 is according to First Line voltage digital value, the second line voltage digital value and the 3rd line voltage digital value of described the first voltage source, and the 4th line voltage digital value in described second voltage source, the 5th line voltage digital value and the 6th line voltage digital value output switch control signal, automatically change between the first voltage source that is accessed and second voltage source to control described automatic change over.
Preferably, described controller 55 carries out at least one in the following detection according to described First Line voltage measuring value, described the second line voltage measurement value, described the 3rd line voltage measurement value: under-voltage detection, decompression detect, overvoltage detects and three-phase imbalance detects; And carry out at least one in the following detection according to described the 4th line voltage measurement value, described the 5th line voltage measurement value, described the 6th line voltage measurement value: under-voltage detection, decompression detect, overvoltage detects and three-phase imbalance detects.
Under-voltage detection, decompression detect, overvoltage detects and the three-phase imbalance detection is well known in the art, no longer it are detected principle at this and give unnecessary details.
Described First Line voltage measuring value, described the second line voltage measurement value, described the 3rd line voltage measurement value, the 4th line voltage measurement value, described the 5th line voltage measurement value and described the 6th line voltage measurement value, preferably arrive in the 3.3V scope 0 with in the voltage range in the AD conversion.
A described AD transducer 52, the 2nd AD transducer 54 and controller 55 can integrate, and for example can realize a described AD transducer 52, the 2nd AD transducer 54 and controller 55 with microcontroller.A described AD transducer 52, the 2nd AD transducer 54 and controller 55 can also have other implementation.
Voltage detecting circuit and automatic transfer switch controller according to the utility model embodiment, utilize simple Pulse Electric depressor string to replace linear transformer, all focus on voltage detecting function in the automatic transfer switch controller, reduce manufacturing cost and the volume of automatic change over, and also improved the voltage detecting precision.
The above has been described with reference to the drawings according to the voltage detecting circuit of the utility model embodiment and automatic transfer switch controller.It will be understood by a person skilled in the art that the utility model is not limited to above-described embodiment, can make various modifications in the situation that does not depart from spirit of the present utility model, described modification also should be included within the scope of the present utility model.Scope of the present utility model should be limited by claims and equivalent thereof.
Claims (10)
1. tension measuring circuit that is used for automatic change over comprises:
The first to the 3rd pulse resistance device string, each pulse resistance device string has same structure and comprises a plurality of pulse resistance devices that are connected in series, the first end of the first pulse resistance device string connects the first-phase of power supply, the first end of the second pulse resistance device string connects the second-phase of power supply, the first end of the 3rd pulse resistance device string connects the third phase of power supply, and described power supply is three-phase supply;
The first to the 3rd blocking capacitor, each blocking capacitor has identical capacitance values, the first end of the first blocking capacitor connects the second end of the first pulse resistance device string, the first end of the second blocking capacitor connects the second end of the second pulse resistance device string, and the first end of the 3rd blocking capacitor connects the second end of the 3rd pulse resistance device string; And
Line voltage calculating section, its first input end connects the second end of described the first blocking capacitor, the second input end connects the second end of described the second blocking capacitor, the 3rd input end connects the second end of described the 3rd blocking capacitor, and the First Line voltage measuring value of the line voltage between its first output terminal output described first-phase of expression and the second-phase, the second line voltage measurement value of the line voltage between its second output terminal output described first-phase of expression and the third phase, with and the 3rd output terminal output described second-phase of expression and third phase between the 3rd line voltage measurement value of line voltage.
2. tension measuring circuit as claimed in claim 1, it is characterized in that: described line voltage calculating section comprises:
The first differential amplifier, its in-phase input end connects the second end of described the first blocking capacitor as the first input end of described line voltage calculating section, its inverting input connects the second end of described the second blocking capacitor as the second input end of described line voltage calculating section, and its output terminal is exported described First Line voltage measuring value as the first output terminal of described line voltage calculating section;
The second differential amplifier, its in-phase input end and the in-phase input end of described the first differential amplifier are connected and connect the second end of described the first blocking capacitor, its inverting input connects the second end of described the 3rd blocking capacitor as the 3rd input end of described line voltage calculating section, and its output terminal is exported described the second line voltage measurement value as the second output terminal of described line voltage calculating section; And
The 3rd differential amplifier, its in-phase input end connects the output terminal of described the first differential amplifier, its inverting input connects the output terminal of described the second differential amplifier, and its output terminal is exported described the 3rd line voltage measurement value as the 3rd output terminal of described line voltage calculating section.
3. tension measuring circuit as claimed in claim 1, it is characterized in that: described line voltage calculating section comprises:
The first differential amplifier, its in-phase input end connects the second end of described the first blocking capacitor as the first input end of described line voltage calculating section, its inverting input connects the second end of described the second blocking capacitor as the second input end of described line voltage calculating section, and its output terminal is exported described First Line voltage measuring value as the first output terminal of described line voltage calculating section;
The second differential amplifier, its in-phase input end and the in-phase input end of described the first differential amplifier are connected and connect the second end of described the first blocking capacitor, its inverting input connects the second end of described the 3rd blocking capacitor as the 3rd input end of described line voltage calculating section, and its output terminal is exported described the second line voltage measurement value as the second output terminal of described line voltage calculating section; And
The 3rd differential amplifier, its in-phase input end and the inverting input of described the second differential amplifier are connected and connect the second end of described the 3rd blocking capacitor, its inverting input and the inverting input of described the first differential amplifier are connected and connect the second end of described the second blocking capacitor, and its output terminal is exported described the 3rd line voltage measurement value as the 3rd output terminal of described line voltage calculating section.
4. such as the described tension measuring circuit of one of claim 1-3, it is characterized in that: described First Line voltage measuring value, described the second line voltage measurement value and described the 3rd line voltage measurement value arrive in the 3.3V scope 0.
5. such as the described tension measuring circuit of one of claim 1-3, it is characterized in that: also comprise the AD conversion fraction, be used for described First Line voltage measuring value, the second line voltage measurement value and the 3rd line voltage measurement value are transformed to respectively First Line voltage digital value, the second line voltage digital value and the 3rd line voltage digital value.
6. automatic transfer switch controller comprises:
The first tension measuring circuit, the voltage for measuring the first three-phase voltage source comprises:
The first to the 3rd pulse resistance device string, each pulse resistance device string have same structure and comprise a plurality of pulse resistance devices that are connected in series, and the first end of the first to the 3rd pulse resistance device string connects respectively the first-phase of the first three-phase voltage source to third phase;
The first to the 3rd blocking capacitor, each blocking capacitor has identical capacitance values, and the first end of the first to the 3rd blocking capacitor connects respectively the second end of the first to the 3rd pulse resistance device string; And
First Line voltage calculating section, its the first to the 3rd input end connects respectively the second end of described the first to the 3rd blocking capacitor, and its first to the 3rd output terminal is exported respectively the second line voltage measurement value of the first-phase of First Line voltage measuring value, described the first three-phase voltage source of expression of the expression first-phase of described the first three-phase voltage source and the line voltage between the second-phase and the line voltage between the third phase and represented the second-phase of described the first three-phase voltage source and the 3rd line voltage measurement value of the line voltage between the third phase;
The one AD conversion fraction is used for described the first to the 3rd line voltage measurement value is transformed to respectively the first to the 3rd line voltage digital value;
The second voltage metering circuit, the voltage for measuring the second three-phase voltage source comprises:
The the 4th to the 6th pulse resistance device string, each pulse resistance utensil in each pulse resistance device string and the first to the 3rd pulse resistance device string has same structure, and the first end of the 4th to the 6th pulse resistance device string connects respectively the first-phase of the second three-phase voltage source to third phase;
The the 4th to the 6th blocking capacitor, each blocking capacitor in each blocking capacitor and the first to the 3rd blocking capacitor has identical capacitance values, and the first end of the 4th to the 6th blocking capacitor connects respectively the second end of the 4th to the 6th pulse resistance device string; And
The second line voltage calculating section, its the first to the 3rd input end connects respectively the second end of described the 4th to the 6th blocking capacitor, and its first to the 3rd output terminal is exported respectively the 5th line voltage measurement value of the first-phase of the 4th line voltage measurement value, described the second three-phase voltage source of expression of the expression first-phase of described the second three-phase voltage source and the line voltage between the second-phase and the line voltage between the third phase and represented the second-phase of described the second three-phase voltage source and the 6th line voltage measurement value of the line voltage between the third phase;
The 2nd AD conversion fraction is used for described the 4th to the 6th line voltage measurement value is transformed to respectively the 4th to the 6th line voltage digital value; And
Controller is used for controlling described automatic change over according to the 4th to the 6th line voltage digital value in the first to the 3rd line voltage digital value of described the first voltage source and described second voltage source and automatically changes between the first three-phase voltage source that accesses and the second three-phase voltage source.
7. automatic transfer switch controller as claimed in claim 6, it is characterized in that: described First Line voltage calculating section comprises:
The first differential amplifier, its in-phase input end connects the second end of described the first blocking capacitor as the first input end of described First Line voltage calculating section, its inverting input connects the second end of described the second blocking capacitor as the second input end of described First Line voltage calculating section, and its output terminal is exported described First Line voltage measuring value as the first output terminal of described First Line voltage calculating section;
The second differential amplifier, its in-phase input end and the in-phase input end of described the first differential amplifier are connected and connect the second end of described the first blocking capacitor, its inverting input connects the second end of described the 3rd blocking capacitor as the 3rd input end of described First Line voltage calculating section, and its output terminal is exported described the second line voltage measurement value as the second output terminal of described First Line voltage calculating section; And
The 3rd differential amplifier, its in-phase input end connects the output terminal of described the first differential amplifier, its inverting input connects the output terminal of described the second differential amplifier, and its output terminal is exported described the 3rd line voltage measurement value as the 3rd output terminal of described First Line voltage calculating section.
8. automatic transfer switch controller as claimed in claim 6, it is characterized in that: described First Line voltage calculating section comprises:
The first differential amplifier, its in-phase input end connects the second end of described the first blocking capacitor as the first input end of described First Line voltage calculating section, its inverting input connects the second end of described the second blocking capacitor as the second input end of described First Line voltage calculating section, and its output terminal is exported described First Line voltage measuring value as the first output terminal of described First Line voltage calculating section;
The second differential amplifier, its in-phase input end and the in-phase input end of described the first differential amplifier are connected and connect the second end of described the first blocking capacitor, its inverting input connects the second end of described the 3rd blocking capacitor as the 3rd input end of described First Line voltage calculating section, and its output terminal is exported described the second line voltage measurement value as the second output terminal of described First Line voltage calculating section; And
The 3rd differential amplifier, its in-phase input end and the inverting input of described the second differential amplifier are connected and connect the second end of described the 3rd blocking capacitor, its inverting input and the inverting input of described the first differential amplifier are connected and connect the second end of described the second blocking capacitor, and its output terminal is exported described the 3rd line voltage measurement value as the 3rd output terminal of described First Line voltage calculating section.
9. automatic transfer switch controller as claimed in claim 6 is characterized in that: described the first to the 6th line voltage measurement value 0 in the 3.3V scope.
10. automatic transfer switch controller as claimed in claim 6 is characterized in that: described controller carries out in the following detection at least one according to described First Line voltage measuring value, described the second line voltage measurement value, described the 3rd line voltage measurement value: under-voltage detection, decompression detect, overvoltage detects and three-phase imbalance detects; And
Described controller carries out at least one in the following detection according to described the 4th line voltage measurement value, described the 5th line voltage measurement value, described the 6th line voltage measurement value: under-voltage detection, decompression detect, overvoltage detects and three-phase imbalance detects.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320273851 CN203250174U (en) | 2013-05-20 | 2013-05-20 | Voltage measure circuit and automatic change-over switch controller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320273851 CN203250174U (en) | 2013-05-20 | 2013-05-20 | Voltage measure circuit and automatic change-over switch controller |
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| Publication Number | Publication Date |
|---|---|
| CN203250174U true CN203250174U (en) | 2013-10-23 |
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|---|---|---|---|
| CN 201320273851 Expired - Lifetime CN203250174U (en) | 2013-05-20 | 2013-05-20 | Voltage measure circuit and automatic change-over switch controller |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114660500A (en) * | 2022-05-19 | 2022-06-24 | 秦皇岛广控科技有限公司 | Three-phase monitoring protection system |
-
2013
- 2013-05-20 CN CN 201320273851 patent/CN203250174U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114660500A (en) * | 2022-05-19 | 2022-06-24 | 秦皇岛广控科技有限公司 | Three-phase monitoring protection system |
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