CN209298013U - A kind of circuit detecting panel switches power relay coil state - Google Patents
A kind of circuit detecting panel switches power relay coil state Download PDFInfo
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- CN209298013U CN209298013U CN201920110877.4U CN201920110877U CN209298013U CN 209298013 U CN209298013 U CN 209298013U CN 201920110877 U CN201920110877 U CN 201920110877U CN 209298013 U CN209298013 U CN 209298013U
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Abstract
The utility model relates to a kind of circuits for detecting panel switches power relay coil state, comprising: isolated power supply circuit, constant-current source circuit, state switching circuit and V-F convert isolation circuit.Isolated power supply circuit provides isolated power supply for entire circuit；Constant-current source circuit generates the weak current Iout for detection；State of the state switching circuit for entire circuit switches；V-F conversion isolation circuit send the CPU into state switching circuit for generating VFO frequency signal, by the IVF frequency signal after the isolation of VFO frequency signal.The utility model use state switching circuit, increases the flexibility used；Power relay coil state is detected using weak current, relay misoperation will not be caused；Coil resistance can be accurately calculated, the circuit design is simple, occupy few cpu resource, save the cost, increases anti-jamming effectiveness；Simplified calculation method improves detection accuracy.
Description
Technical field
The utility model belongs to electric power system power distribution switching technique field, and in particular to a kind of to utilize Weak current signal detection distribution
The circuit of switch power relay coil state.
Background technique
Panel switches are usually to drive its switch motion by power relay by control unit.Control unit exports division
The power relay in signal distribution control box is controlled, the operating mechanism of power relay driving switch carries out division, completes to match
The breaking-closing operating of electric line.
Actual demands, the power relay such as facilitated by the volume and output power limit of control unit and maintenance, replacement
It is not placed in control unit generally, but is placed in distribution box together with control unit, installed using guide rail mode, this is just
Need manual wiring.Since manual wiring is more and power relay Status unknown, this link easily breaks down, such as connects
Situations such as line disconnection, contact loosening, power relay coil short or disconnection.If there is switch motion exception under traditional mode
When, it needs manually checked, overhauled to scene.
Summary of the invention
Based on above-mentioned problem, Weak current signal detection panel switches power relay line is utilized the utility model proposes a kind of
The circuit of round state, before power relay movement, using the resistance of Weak current signal detection power relay coil, if resistance
In the normal range, the driving power actuating of relay again ensures that power relay is failure to actuate during the test, will not cause to switch
Malfunction.Technical solution used by the utility model is as follows:
A kind of circuit detecting panel switches power relay coil state characterized by comprising isolated power supply electricity
Road, constant-current source circuit, state switching circuit and V-F convert isolation circuit；
Isolated power supply circuit provides isolated power supply for entire circuit；Constant-current source circuit generates the weak current for detection
Iout is electrically connected the exit relay for being delivered to state switching circuit；State of the state switching circuit for entire circuit is cut
It changes and power relay coil resistance calculates, judges, the common end (COM) two of the exit relay in state switching circuit
End is electrically connected the power relay coil both ends being external in V-F conversion isolation circuit, driving panel switches；V-F conversion isolation
Circuit send the IVF frequency signal after the isolation of VFO frequency signal into state switching circuit for generating VFO frequency signal
CPU。
The utility model has the beneficial effects that
1) use state switching circuit increases the flexibility used.
2) power relay coil state is detected using weak current, relay misoperation will not be caused.
3) on-site signal is converted into frequency signal using V-F conversion isolation circuit, coil resistance can be accurately calculated,
The circuit design is simple, occupy few cpu resource, save the cost, increases anti-jamming effectiveness.
4) adjustment is carried out to circuit parameter using adjustable potentiometer, simplified calculation method improves detection accuracy.
Detailed description of the invention
Fig. 1 is the isolated power supply electrical block diagram of the utility model embodiment；
Fig. 2 is the constant-current source circuit structure schematic diagram of the utility model embodiment；
Fig. 3 is the state switching circuit structural schematic diagram of the utility model embodiment；
Fig. 4 is the V-F conversion isolation circuit structural schematic diagram of the utility model embodiment.
Specific embodiment
With reference to the accompanying drawing, the embodiments of the present invention is illustrated.
As shown in Figure 1, being the isolated power supply electrical block diagram of the utility model embodiment；As shown in Fig. 2, being this reality
With the constant-current source circuit structure schematic diagram of new embodiment；As shown in figure 3, being the state switching circuit of the utility model embodiment
Structural schematic diagram；As shown in figure 4, being the V-F conversion isolation circuit structural schematic diagram of the utility model embodiment.This is practical new
The circuit of type embodiment is mainly made of four parts: isolated power supply circuit, constant-current source circuit, state switching circuit and V-F conversion
Isolation circuit.Isolated power supply circuit provides isolated power supply for entire circuit, it is ensured that the CPU electricity of state switching circuit during the test
Road part and detected element realize electrical isolation；Constant-current source circuit generates the weak current Iout for detection, is electrically connected defeated
It send to the exit relay of state switching circuit；State switching and power relay of the state switching circuit for entire circuit
Functions, the both ends electrical connections of the exit relay in state switching circuit such as device coil resistance calculates, judgement are external to V-F conversion
Power relay coil both ends, driving panel switches in isolation circuit；V-F conversion isolation circuit is for generating VFO frequency letter
Number, it send the IVF frequency signal after the isolation of VFO frequency signal to the CPU into state switching circuit, calculates the resistance value of coil,
It may determine that coil resistance value is in states such as normal range (NR), the super upper limit, super lower limit, short circuit, open circuits according to calculated result.Isolation electricity
The particular circuit configurations that source circuit, constant-current source circuit, state switching circuit and V-F convert isolation circuit are described as follows:
One, the structure of isolated power supply circuit is shown in attached drawing 1.In Fig. 1, power input VCC is through filter capacitor E1 and filter circuit
LC1 is electrically connected with DC-DC isolated power supply module DC1, and DC1 is exported through power supply and is in turn electrically connected to wink through self-recovery fuse PTC1
Between inhibit diode TVS1, power supply output filter capacitor E2, most afterwards through by filter circuit LC2 output with input power VCC every
From out-put supply VC+.When load current is greater than the rated value of PTC1, PTC1 be will be switched off, protective separation power module；TVS1
It is moment to inhibit diode, when output voltage is higher than load voltage value, by output voltage clamper in load voltage value.Pass through this
Input power VCC is become the VC+ out-put supply being isolated with VCC by circuit after DC1, provides electricity for other circuits in attached drawing
Source, the power supply of all mark VC+, VC- network labels is provided by the isolated power supply in attached drawing.
The circuit ensures that electrical isolation is realized in cpu circuit part during the test and detected element, improves anti-interference energy
Power can select different isolated power supply voltage according to the input voltage range that V-F is converted.
Two, constant-current source circuit structure is shown in attached drawing 2.In Fig. 2, current source is used as using LM334 (U1), uses R2 and adjustable electric
The output electric current of constant-current source had both been adjusted in device RT1 concatenated method in position, ensured that constant-current source output not will cause the feelings of short circuit
Condition；J1 is devised simultaneously and is shorted wire jumper, is cooperated with J2, RT2, RT3 in V-F conversion isolation circuit, can be simplified rate-adaptive pacemaker tune
It is whole, it does not need CPU and state switching circuit participates in.U1 (LM334) is adjustable current source chip, and CI provides isolated power supply circuit
VC+ power supply be filtered and provide power supply for U1, resistance R2 and adjustable resistance RT1 form constant-current source output regulation circuit, will adjust
Whole resistance is divided into R2 and RT2, if being to ensure that RT value is 0 Ω before constant-current source adjusts, adjustment circuit is again because there is resistance R2, really
It protects output electric current and is less than certain certain value；J1 is to be shorted wire jumper, is used cooperatively with J2, and adjustment V-F converts isolation circuit rate-adaptive pacemaker
Value, detailed directions illustrate in V-F conversion isolation circuit.
The output electric current Iout of constant-current source flows through power relay coil by state switching circuit, is produced by coil resistance
Raw voltage, which converts by V-F and isolation circuit generates the resistance value state that frequency signal is sent to CPU detection coil.
Constant-current source circuit provides constant test electric current for relay-coil resistance detection, for convenience of calculating, the utility model
In used R2 and adjustable potentiometer RT1, adjust RT1, make to export 1 milliampere of electric current of electric current Iout constant output.It can also basis
Actual operation requirements, adjustment RT1 export different current values, and the Iout maximum value of this circuit is 10 milliamperes.
Three, state switching circuit structure is shown in attached drawing 3.In Fig. 3, CPU board is responsible for the state switching of entire circuit, power relay
The functions such as the calculating of device coil resistance, judgement.In state switching circuit, mainly by normal-open type relay (1A type) RY2 and it is normally opened often
Closed form relay (1C type) RY1 composition, the common end (COM) of RY1 connect power relay coil both ends, and normal opened contact (O) connects function
The operation power (KM) of rate relay driving coil motion, normally closed contact (C) connect the normally open end (O) of RY2；The common end RY2
(COM) the electric current output (Iout) of constant-current source circuit is connect, the open and-shut mode of two relays is controlled by CPU according to process requirements
System.
RY1 is exit relay in figure, and state is driven by CPU board by isolation circuit, and common end (COM) holds (net
Network marks I_RY3 and VC-_RY3) external power relay RY3 coil both ends, RY3 drives panel switches；RY2 is detection relay
Device is driven by CPU board by isolation circuit.The conversion of state switching circuit processing two states:
1, detect power relay coil state: CPU is connected to remote control command, if setting requirements put into detection function,
Driving detection relay RY2 is switched to closed state by normally open, connects constant-current source circuit, 1 milliampere of electricity that constant-current source generates
The voltage V_RY3 that stream signal (Iout) flows through the generation of power relay coil is converted into frequency signal through V-F conversion isolation circuit
CPU is sent to calculate, if calculated result meets the requirements, then first driving detection relay RY2 switches back into normally open by closed state, breaks
Constant-current source circuit is opened, then exit relay RY1 is driven to be switched to normal opened contact by normally closed contact, by+KM and-KM power supply signal
It is added on the coil of RY3 power relay, RY3 movement drives panel switches division, after the completion of movement, by RY1 by normal opened contact
It is switched to normally closed contact；If calculated result is undesirable, then detection relay RY2 is driven to switch back into normally opened shape by closed state
State, CPU warning note cancel remote control actions.
2, do not detect power relay coil state: CPU is connected to remote control command, if setting requirements do not put into detection function
Can, driving exit relay RY1 is switched to source side and executes remote control command, i.e. RY1 is switched to normal opened contact by normally closed contact,
+ KM and-KM power supply signal are added on the coil of RY3 power relay, RY3 movement drives panel switches division, acted
RY1 is switched to normally closed contact by normal opened contact by Cheng Hou.
Four, V-F conversion isolation circuit structure is shown in attached drawing 4.V-F is converted in isolation circuit, and LM331 (U2) is that V-F is converted
Master chip, the connection configuration of periphery component are the typical cases of the chip.Typical case is improved in the utility model,
After wire jumper J2 and adjustable potentiometer RT2 series connection will be shorted, it is connected in parallel on before voltage input resistance R3, and it is short in constant-current source circuit
Wire jumper J1 cooperation is connect, provides debugging voltage for the V-F conversion of this circuit；Another improvement be using variable potentiometer RT2 and
RT3 adjusts rate-adaptive pacemaker, flows through RT2 by 1 milliampere of electric current that constant-current source circuit exports, adjusts RT2 resistance value, make the voltage at its both ends
For 1VDC, RT3 is then adjusted, so that rate-adaptive pacemaker VFO is equal to 1KHZ, facilitates calculating；Later by frequency output signal VFO through light
IVF signal after electrical isolation device TLP281-1 (OU1) is sent to CPU.
General voltage signal acquisition partition method is isolated using linear optical coupling, uses A/D converter circuit later,
Digital quantity is converted by analog quantity be sent to CPU calculate；Or voltage analog is first converted into number using AD conversion circuit
Word amount is sent to CPU after digital quantity is isolated later and calculates.The shortcomings that these traditional approach be occupy cpu resource compared with
It is more, at high cost, occupy plate suqare it is more, debugging link it is cumbersome.
In the utility model, state switching circuit is switched to detection power relay coil state, constant-current source in figure by CPU
The 1 milliampere of electric current (IOUT) generated flows through the coil of power relay RY3, will generate voltage V_RY3 on coil resistance at this time, this
Voltage signal generates VFO frequency signal by V-F conversion circuit, and the IVF frequency signal after VFO is isolated send to CPU, calculates
The resistance value of coil may determine that coil resistance value is in normal range (NR), the super upper limit, super lower limit, short circuit, open circuit according to calculated result
Etc. states.
Circuit connection is the typical usage of V-F rate-adaptive pacemaker in figure.U2 (LM331) is V-F conversion chip, and R3 is needed and R4
100K Ω is all selected in matching；R6 and C4 determines RC filter constant, and taking representative value R6 is 6.8K Ω, and C4 takes 0.01uF；C2 is to input
Voltage is filtered, we selected typical value 0.1uF, C3 we selected typical value 1uF, R5 we selected typical value 47 Ω, C3, R4 and R5 composition
Threshold voltage, representative value ensure that LM331 internal comparator is overturn, correctly output frequency；C5 is the filtering of LM331 power supply VC+
Capacitor, the gain adjustment of R8 and RT3 component frequency output, R7 is the pull-up resistor of LM331 frequency open-drain output；J2 is short circuit
Wire jumper.
OU1 is photoelectric coupling chip in figure, by frequency output signal VFO by Phototube Coupling be converted to IVF signal send to
CPU is calculated, and R9 is input current-limiting resistance, and R10 is output driving resistance.
It with wire jumper, variable resistance RT2 is shorted is debugging adjustable resistance, simulated power relay when debugging that J2, which is debugging, in figure
Device coil resistance value.
The utility model circuit is verification, convenience of calculation, and two adjustable potentiometers RT2, RT3 and two short circuits has been used to jump
Line J1, J2.In debugging, adjustment RT1 exports 1 milliampere of electric current；It is shorted J1, J2 (do not need state switching circuit and CPU is participated in),
1 milliampere of electric current (IOUT) of constant-current source output flows through RT2 (I_RY3=IOUT at this time), and adjustment RT2 makes the voltage (V_ at its both ends
RY3 it is) 1VDC, then adjusts RT3, make output frequency IVF 1KHZ, can converts and be for the resistance output frequency of 1K Ω
1KHZ is linear relationship, facilitates calculating and judgement, computational accuracy is up to 5 ‰ after the completion of adjustment.After debugging must disconnect J1 and
J2 shorting stub.The adjustment method has avoided state switching circuit, participates in debugging without CPU, facilitates scheduling and planning.
It is 1K Ω~2K Ω, bound that the use setting condition of the utility model, which is power relay coil resistance rated value,
It is ± 30%.Can according to actual needs and in conjunction with the state that measured value set coil be short-circuit, super lower limit, normally, the super upper limit,
The states such as open circuit.
If necessary to power relay resistance detection function, first passing through internal relay will test panel switches power relay
The circuitous resistance detection circuit of device coil state is put into, and is flowed through power relay coil by the weak current that constant-current source circuit generates and is produced
Voltage access V-F is converted isolation circuit by raw coil voltage, and the frequency signal after being isolated, which is sent to CPU, to be calculated, is obtained
Relay-coil resistance.The state of panel switches power relay coil is judged according to resistance value, if calculated value is in specified model
In enclosing, then judge that relay is normal, carries out routine operation；If over range, judges relay exception, reported
Alert, termination operation.This constant-current source circuit maximum generates 10 milliamperes of electric currents, and driving current should be selected to be greater than 20 when selecting relay
Milliampere, to ensure during resistance detection, power relay malfunction will not be caused.
Claims (5)
1. a kind of circuit for detecting panel switches power relay coil state characterized by comprising isolated power supply circuit,
Constant-current source circuit, state switching circuit and V-F convert isolation circuit；
Isolated power supply circuit provides isolated power supply for entire circuit；Constant-current source circuit generates the weak current Iout for detection, warp
Electrical connection is delivered to the exit relay of state switching circuit；State of the state switching circuit for entire circuit switches, and
Power relay coil resistance calculates, judges that the common end both ends the COM electrical connection of the exit relay in state switching circuit is outer
Be connected to V-F conversion isolation circuit in power relay coil both ends, driving panel switches；V-F conversion isolation circuit is for producing
Raw VFO frequency signal send the IVF frequency signal after the isolation of VFO frequency signal to the CPU into state switching circuit.
2. a kind of circuit for detecting panel switches power relay coil state according to claim 1, which is characterized in that
In the isolated power supply circuit, power input VCC is through filter capacitor E1 and filter circuit LC1 and DC-DC isolated power supply module
DC1 electrical connection, DC1 are exported through power supply and are in turn electrically connected to moment inhibition diode TVS1, power supply through self-recovery fuse PTC1
Output filter capacitor E2, most afterwards through exporting the out-put supply VC+ being isolated with input power VCC by filter circuit LC2.
3. a kind of circuit for detecting panel switches power relay coil state according to claim 1, which is characterized in that
In the constant-current source circuit, using LM334, that is, U1 as current source, R2 and adjustable potentiometer RT1 series connection, J1 be shorted wire jumper with
V-F converts J2, RT2, RT3 cooperation in isolation circuit.
4. a kind of circuit for detecting panel switches power relay coil state according to claim 1, which is characterized in that
In the state switching circuit, it is made of 1A type normal-open type relay RY2 and 1C type normally-open normally-close type relay RY1, RY1's
Common end COM connects power relay coil both ends, and normal opened contact O meets the operation power KM of power relay driving coil movement,
Normally closed contact C meets the normally open end O of RY2；The common end RY2 COM meets the electric current output Iout of constant-current source circuit, and two relays are opened
Closed state is controlled by CPU according to process requirements.
5. a kind of circuit for detecting panel switches power relay coil state according to claim 1, which is characterized in that
In the V-F conversion isolation circuit, LM331, that is, U2 is the master chip of V-F conversion, will be shorted wire jumper J2 and adjustable potentiometer
It after RT2 series connection, is connected in parallel on before voltage input resistance R3, cooperates with the short circuit wire jumper J1 in constant-current source circuit；Use variable electric potential
Device RT2 and RT3 adjust rate-adaptive pacemaker, and IVF of the frequency output signal VFO after photoelectric isolating device TLP281-1, that is, OU1 is believed
Number it is sent to CPU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920110877.4U CN209298013U (en) | 2019-01-23 | 2019-01-23 | A kind of circuit detecting panel switches power relay coil state |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920110877.4U CN209298013U (en) | 2019-01-23 | 2019-01-23 | A kind of circuit detecting panel switches power relay coil state |
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| CN209298013U true CN209298013U (en) | 2019-08-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109727813A (en) * | 2019-01-23 | 2019-05-07 | 积成电子股份有限公司 | A kind of circuit and method detecting panel switches power relay coil state |
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2019
- 2019-01-23 CN CN201920110877.4U patent/CN209298013U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109727813A (en) * | 2019-01-23 | 2019-05-07 | 积成电子股份有限公司 | A kind of circuit and method detecting panel switches power relay coil state |
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