CN106647245A - Self-adaption on-off input circuit of electric power secondary equipment - Google Patents
Self-adaption on-off input circuit of electric power secondary equipment Download PDFInfo
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- CN106647245A CN106647245A CN201611074950.4A CN201611074950A CN106647245A CN 106647245 A CN106647245 A CN 106647245A CN 201611074950 A CN201611074950 A CN 201611074950A CN 106647245 A CN106647245 A CN 106647245A
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- Prior art keywords
- input
- circuit
- input circuit
- temperature
- output voltage
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
Abstract
The invention discloses a self-adaption on-off input circuit of electric power secondary equipment. The self-adaption on-off input circuit comprises a CPU with an ADC or an ADC and a CPU which are discrete devices, and also comprises an on-off dc power supply monitoring circuit, an on-off signal input circuit and a temperature monitoring circuit. The ADC has a plurality of sampling channels which respectively take samples of the output analog quantity of the on-off signal input circuit, the on-off dc power supply monitoring circuit and the temperature monitoring circuit. The self-adaption on-off input circuit of the electric power secondary equipment can adjust the on-off input voltage motion threshold value through software in a self-adaption manner, can monitor the state of the on-off power supply, and is characterized by being low in hardware cost, convenient in software maintenance, good in fault-tolerant and anti-interference performances and wide in application field, and being suitable for the industrial-grade operating temperature environment.
Description
Technical field
The present invention relates to a kind of self-adaptive switch amount input circuit of second power equipment, belongs to power automation technology neck
Domain.
Background technology
In power automatic device, the application of switch acquisition is very universal.State Grid Corporation of China is to relay protection class
What the On-off signal action threshold of device had puts forward higher requirement, and On-off signal operation voltage threshold must is fulfilled for
The rated supply voltage of 55%-70%, thus switching value point, conjunction state basis for estimation have to rely on external switch amount dc source
Voltage.Switching value dc source is generally all directly to take from the power supply or external dc screen output in power automatic device
Power supply, have plurality of specifications, such as DC24V, DV48V, DC110V and DC220V etc., supply voltage can be with the change of connect load
Change and change.
Under power automatic device is in order to adapt to different switching value input power, it is ensured that switching value operation voltage threshold falls
In 55%-70% rated supply voltages are interval, following two coping styles are usually taken：
1）For different On-off signal power supplys, using different On-off signal loop hardware schemes, using difference
Components and parts.Which causes the production schedule, stock control, the difficulty in user's O＆M spare parts management；
2）Using linear isolation optocoupler sampling switch amount input signal, the analog signalses of collection are delivered to into ADC, calculated with software
On-off signal voltage, judges whether on-off state.Which circuit is complicated, and each way switch amount signal input loop will
Using the components and parts such as a linear isolation optocoupler and corresponding insulating power supply, difference amplifier；High cost, using linear isolation light
The On-off signal loop Material Cost of coupling is the hundreds of times using conventional optocoupler loop.
The content of the invention
Purpose：In order to overcome the deficiencies in the prior art, the present invention to provide a kind of self adaptation of second power equipment
Switching value input circuit.The self adaptation for realizing On-off signal signalizing activity voltage threshold under industrial temperature environment is accurately known
Not.
To achieve these goals, the technical scheme is that what is be achieved in that：A kind of second power equipment it is adaptive
The circuit of inductive switch amount input, including：CPU with ADC or ADC, CPU adopt circuit, the switching value direct current of discrete device
Source monitoring circuit, on-off model input circuit, temperature monitoring loop.
The ADC has multiple sampling channels, and respectively switch amount signal input loop, switching value dc source are monitored back
Road, the output analog quantity sampling in temperature monitoring loop.
The switching value dc source monitoring circuit includes：Current-limiting resistance, sampling resistor, linear isolation optocoupler, amplifier are adjusted
Reason circuit.Between positive signal input, the negative signal input of the linear isolation optocoupler and connect sampling resistor, filter capacitor,
Positive signal input connects multiple current-limiting resistances to switching value dc source anode, the multiple current-limiting resistances of negative signal input series connection
To switching value dc source negative terminal.The signal output port of linear isolation optocoupler is connected to amplifier modulate circuit and drives output extremely
The sampling channel of ADC.
The on-off model input circuit includes：Switching value isolation optocoupler, current-limiting resistance, sampling resistor, amplifier conditioning
Circuit, between positive signal input, the negative signal input of the switching value isolation optocoupler and connects filter capacitor, positive signal input
Series connection multiple current-limiting resistances in end are to external switch amount signal output part anode, and it is defeated that negative signal input terminates to external switch amount signal
Go out and hold negative terminal, the positive supply of switching value isolation optocoupler positive signal output termination CPU sides power supply, switching value isolation optocoupler negative signal
The sampled resistance of output end, filter capacitor are connected to the ground terminal of CPU sides power supply, while negative signal output end Jing amplifier modulate circuit
Export to the sampling channel of ADC.
The temperature monitoring loop includes：Temperature sensor, amplifier modulate circuit, the output Jing fortune of the temperature sensor
Put after modulate circuit drives and access ADC simulation input pins.Temperature sensor is used for the ring in monitoring switch amount signal input loop
Border temperature.
Second power equipment self-adaptive switch amount input circuit method of discrimination：
Step one：CPU gathers the output voltage values Vai2 of switching value dc source monitoring circuit, obtains by the circuit parameter calculation
Go out the input voltage value in the loop, the i.e. input gate of switching value direct current power source voltage value Uin, and on-off model input circuit
Sill voltage Um, typically takes the 62.5% of Uin.CPU reads the AD sampled values in temperature monitoring loop, i.e., the work of current each associated loop
Make temperature t；
Step 2：CPU gathers the output voltage values Vai1 of on-off model input circuit；
Step 3：The on-off model input circuit is looked in 25 °C of input and output voltage relation tables of normal temperature, on-off model is defeated
The input threshold voltage Um of entry loop tables look-up and draws corresponding input and output voltage ratio as input voltage value, asks product to obtain
Go out corresponding output voltage values, as the output voltage threshold value Vm of 25 °C of on-off model input circuits of normal temperature（25°C）.
Step 4：The on-off model input circuit temperature characterisitic coefficient table looked under current temperature value t, obtains proportionality coefficient
K, can calculate the output voltage threshold value Vm of the on-off model input circuit under current temperature value t（t°C）, Vm（t°C）= Vm
（25°C）/K.
Step 5：The relatively output voltage values Vai1 and output voltage threshold value Vm of the on-off model input circuit（t°
C）.As Vai1 >=Vm（t°C）When, the On-off signal of the on-off model input circuit is effective；It is otherwise invalid.
This time when on-off model input circuit input and output voltage relation table in 25 °C of normal temperature is 25 °C of normal temperature
The input on road, the ratio of output voltage.It is mutually synthermal, identical defeated due to switching value isolation optocoupler current transfer ratio parameter differences
Under entering voltage conditions, many switching value isolation optocoupler output voltage values of same model are variant.The numerical value of the table needs to survey in advance
Examination, and be stored in the nonvolatile storage of system.
The on-off model input circuit temperature characterisitic coefficient table, the coefficient table is under different temperatures environment, difference
The ratio of the output voltage values of on-off model input circuit and 25 °C of lower output voltage values of normal temperature under the conditions of input voltage.This is
Number table data are the arithmetic mean of instantaneous value of multi-way switching values signal input loop measurement data.The value is stored in the non-volatile of system and deposits
In reservoir.
Beneficial effect：A kind of self-adaptive switch amount input circuit of second power equipment that the present invention is provided, can fit automatically
Following 24VDC-300VDC intakes are answered, threshold can be effectively judged using any point voltage as switching value, circuit is reduced and is set
Meter cost, ensures the safe and stable operation of second power equipment.
Description of the drawings
Fig. 1 is structured flowchart 1 of the present invention by taking the input of 3 way switch amounts as an example；
Fig. 2 is structured flowchart 2 of the present invention by taking the input of 3 way switch amounts as an example；
Fig. 3 is the circuit diagram of the present invention；
Fig. 4 is method of the present invention flow chart.
Specific embodiment
The present invention is further described below in conjunction with the accompanying drawings.
As shown in Figure 1, 2, mainly there is the tunnel of on-off model input circuit three for gathering switching value, for monitoring switch
The switching value dc source monitoring circuit of amount direct current power source voltage, it is for the temperature monitoring loop of measuring environment temperature and negative
Duty processes on-off model input circuit, switching value dc source monitoring circuit and switching value circuit temperature monitoring circuit output mould
Intend signal, completing the ADC of analog-to-digital conversion can adopt individual devices or be integrated in CPU, complete input switch amount adaptive judgement
CPU.
As shown in figure 3, on-off model input circuit all the way is illustrate only in the figure, the on-off model input circuit
Including：One switching value isolation optocoupler U1, a current-limiting resistance R1, a counnter attack diode D1, switching value isolation optocoupler U1 just,
Between negative signal input and meet a filter capacitor C1, its positive signal input concatenates current-limiting resistance R1 to the defeated of on-off model
Go out proper end, its negative signal input terminates to the output end negative terminal of on-off model, its positive signal output termination CPU sides power supply
Positive power source terminal VCC, its sampling resistor R2 of negative signal output end Jing mono- and filter capacitor C2 is connected to the ground terminal of CPU sides power supply, together
When negative signal output end be connected to ADC input pins via the amplifier modulate circuit that R3, C3, U2 are constituted；
The switching value dc source monitoring circuit includes：One linear isolation optocoupler U3, two current-limiting resistance R4 and R6, a sampling electricity
Resistance R5, between the positive and negative signal input part of linear isolation optocoupler U3 and meets a filter capacitor C4, its positive signal input concatenation limit
, to the output end anode of switching value dc source, its negative signal input concatenation current-limiting resistance R6 is to switching value direct current for leakage resistance R4
The output end negative terminal of power supply, the positive-negative output end of linear isolation optocoupler U3 is connect by resistance R7, R8, R9, R10, electric capacity C5, C6 and fortune
The amplifier modulate circuit for putting U4 compositions is connected to ADC input pins；
The temperature monitoring loop is a TEMP chip, and output is connected to ADC input pins.
As shown in figure 4, being that operation principle of the present invention is as follows：
1) CPU gather switching value dc source monitoring circuit output voltage Vai2, due to linear isolation optocoupler input,
Output voltage Ratio invariableness, can be by the intrinsic standoff ratio of current-limiting resistance and sampling resistor, the input of linear isolation optocoupler, output voltage ratio
The amplification coefficient of value and amplifier modulate circuit calculates On-off signal supply voltage Uin；
2) CPU samples to the output analog quantity in temperature monitoring loop, obtains current switch amount signal input loop works temperature t；
3) CPU gathers the output voltage values Vai1 of on-off model input circuit；
4) according to On-off signal supply voltage Uin, corresponding input threshold voltage Um is calculated, looks into the on-off model and be input into back
Input and output voltage relation table understands the output voltage threshold value of this loop correspondence Um in 25 °C of normal temperature during 25 °C of the normal temperature on road
Vm（25°C）.On-off model input circuit temperature characterisitic coefficient table is looked into, on-off model input under Current Temperatures t can be obtained
The output voltage threshold value Vm in loop（t°C）With output voltage threshold value Vm when 25 °C（25°C）Proportional coefficient K, calculate Vm
（t°C）= Vm（25°C）/K；
5) Vai1 and output voltage threshold value Vm is compared（t°C）Relation, as Vai1 >=Vm（t°C）When, on-off model input
The On-off signal in loop is effective；It is otherwise invalid.
The above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (4)
1. the self-adaptive switch amount input circuit of a kind of second power equipment, including：CPU with ADC or ADC, CPU are adopted and divided
Vertical device, it is characterised in that：Also include that switching value dc source monitoring circuit, on-off model input circuit, temperature monitoring are returned
Road；
The ADC has multiple sampling channels, respectively switch amount signal input loop, switching value dc source monitoring circuit,
The output analog quantity sampling in temperature monitoring loop；
The switching value dc source monitoring circuit includes：Current-limiting resistance, sampling resistor, linear isolation optocoupler, amplifier conditioning electricity
Road, between positive signal input, the negative signal input of the linear isolation optocoupler and connects sampling resistor, filter capacitor, just believes
Number input connects multiple current-limiting resistances to switching value dc source anode, and negative signal input connects multiple current-limiting resistances to opening
Measure dc source negative terminal in pass；The signal output port of linear isolation optocoupler is connected to amplifier modulate circuit and drives output to ADC's
Sampling channel；
The on-off model input circuit includes：Switching value isolation optocoupler, current-limiting resistance, sampling resistor, amplifier modulate circuit,
Between positive signal input, the negative signal input of the switching value isolation optocoupler and connect filter capacitor, positive signal input string
Join multiple current-limiting resistances to external switch amount signal output part anode, negative signal input terminates to external switch amount signal output part
Negative terminal, the positive supply of switching value isolation optocoupler positive signal output termination CPU sides power supply, the output of switching value isolation optocoupler negative signal
Sampled resistance, filter capacitor is held to be connected to the ground terminal of CPU sides power supply, while the output of negative signal output end Jing amplifier modulate circuit
The sampling channel of ADC；
The temperature monitoring loop includes：Analog temperature signal sensor, amplifier modulate circuit, the output of the temperature sensor
ADC is accessed Jing after amplifier modulate circuit drives；
Analog temperature signal sensor is used for the environment temperature in monitoring switch amount signal input loop.
2. a kind of second power equipment self-adaptive switch amount input circuit method of discrimination, it is characterised in that：The step is as follows：
Step one：CPU gathers the output voltage values Vai2 of switching value dc source monitoring circuit, obtains by the circuit parameter calculation
Go out the input voltage value in the current loop, i.e. switching value direct current power source voltage value Uin, and on-off model input circuit it is defeated
Enter threshold voltage Um, take the 62.5% of Uin；CPU reads the AD sampled values in temperature monitoring loop, i.e., the work of current each associated loop
Make temperature t；
Step 2：CPU gathers the output voltage values Vai1 of on-off model input circuit；
Step 3：The on-off model input circuit is looked in 25 °C of input and output voltage relation tables of normal temperature, on-off model is defeated
The input threshold voltage Um of entry loop tables look-up and draws corresponding input and output voltage ratio as input voltage value, asks product to obtain
Go out corresponding output voltage values, as the output voltage threshold value Vm of 25 °C of on-off model input circuits of normal temperature（25°C）；
Step 4：The on-off model input circuit temperature characterisitic coefficient table looked under current temperature value t, obtains Proportional coefficient K, can
Calculate the output voltage threshold value Vm of the on-off model input circuit under current temperature value t（t°C）, Vm（t°C）= Vm（25°
C）/K；
Step 5：The relatively output voltage values Vai1 and output voltage threshold value Vm of the on-off model input circuit（t°C）；When
Vai1≥Vm（t°C）When, the On-off signal of the on-off model input circuit is effective；It is otherwise invalid.
3. a kind of second power equipment self-adaptive switch amount input circuit method of discrimination according to claim 2, its feature
It is：Loop when on-off model input circuit input and output voltage relation table in 25 °C of normal temperature is 25 °C of normal temperature
Input, the ratio of output voltage.
4. a kind of second power equipment self-adaptive switch amount input circuit method of discrimination according to claim 2, its feature
It is：The on-off model input circuit temperature characterisitic coefficient table, the coefficient table is under different temperatures environment, different inputs
The ratio of the output voltage values of on-off model input circuit and 25 °C of lower output voltage values of normal temperature under voltage conditions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611074950.4A CN106647245A (en) | 2016-11-29 | 2016-11-29 | Self-adaption on-off input circuit of electric power secondary equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611074950.4A CN106647245A (en) | 2016-11-29 | 2016-11-29 | Self-adaption on-off input circuit of electric power secondary equipment |
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| CN106647245A true CN106647245A (en) | 2017-05-10 |
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ID=58813131
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611074950.4A Pending CN106647245A (en) | 2016-11-29 | 2016-11-29 | Self-adaption on-off input circuit of electric power secondary equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109188989A (en) * | 2018-11-07 | 2019-01-11 | 紫光测控有限公司 | One kind is opened into acquisition 110V220V Adaptable System |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109188989A (en) * | 2018-11-07 | 2019-01-11 | 紫光测控有限公司 | One kind is opened into acquisition 110V220V Adaptable System |
| CN109188989B (en) * | 2018-11-07 | 2021-06-01 | 紫光测控有限公司 | Open-in acquisition 110V220V self-adaptive system |
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Application publication date: 20170510 |
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