CN205846858U - A kind of uninterrupted voltage-stabilizing power supply system of PLC - Google Patents
A kind of uninterrupted voltage-stabilizing power supply system of PLC Download PDFInfo
- Publication number
- CN205846858U CN205846858U CN201620800460.7U CN201620800460U CN205846858U CN 205846858 U CN205846858 U CN 205846858U CN 201620800460 U CN201620800460 U CN 201620800460U CN 205846858 U CN205846858 U CN 205846858U
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- circuit
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- power supply
- voltage
- stabilizing
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Abstract
This utility model belongs to PLC power switching technical field, it is specifically related to a kind of uninterrupted voltage-stabilizing power supply system of PLC, including the PLC main power source module powered for PLC device and PLC standby power supply module, PLC standby power supply module includes accumulator battery, charge circuit circuit, reference voltage stabilizing source circuit, comparison circuit and discharge loop circuit, and charge circuit circuit input end is connected with the positive power source terminal of PLC device；Charge circuit circuit output end is connected with accumulator battery positive pole, accumulator battery minus earth；Accumulator battery is connected with the input of reference voltage stabilizing source circuit, the outfan of reference voltage stabilizing source circuit is connected with comparison circuit input, reference voltage is provided for comparison circuit, the outfan of comparison circuit is connected with the input of discharge loop circuit, and the outfan of discharge loop circuit is connected with the positive power source terminal of PLC device.This utility model can offer stable operating voltage uninterrupted to PLC device.
Description
Technical field
This utility model belongs to PLC power switching technical field, be specifically related to a kind of PLC and power with uninterrupted voltage stabilizing be
System.
Background technology
PLC Industry Control use local a lot, be the core of whole control system, be also to realize whole factory automation
Important equipment.At present automatization's industry PLC is powered commonly used directly from electric power system power taking access PLC power supply mould
Block, electric power system fault, short circuit, tripping operation, voltage pulsation etc. occur, PLC can be caused to restart, this startup is for common
Equipment may affect little, but for some special installations, in running, PLC can not restart, and otherwise can make
Become product rejection, even there is also major accident.
Utility model content
The purpose of this utility model be to provide a kind of circuit simple, can offer steady operation uninterrupted to PLC device
The uninterrupted voltage-stabilizing power supply system of the PLC of voltage.
For achieving the above object, this utility model is by the following technical solutions: a kind of PLC powers with uninterrupted voltage stabilizing and is
System, including the PLC main power source module powered for PLC device and PLC standby power supply module, described PLC main power source module directly from
Power taking in electrical network electric power system, described PLC standby power supply module includes accumulator battery, charge circuit circuit, reference voltage stabilizing source electricity
Road, comparison circuit and discharge loop circuit, described charge circuit circuit input end is connected with the positive power source terminal of PLC device；Described
Charge circuit circuit output end is connected with accumulator battery positive pole, described accumulator battery minus earth；Described accumulator battery and benchmark
The input of source of stable pressure circuit connects, and the outfan of described reference voltage stabilizing source circuit is connected with comparison circuit input, for comparing
Circuit provides reference voltage, and the outfan of described comparison circuit is connected with the input of discharge loop circuit, described discharge loop
The outfan of circuit is connected with the positive power source terminal of PLC device.
Described charge circuit circuit includes the first diode, the positive pole of described first diode and the positive supply of PLC device
End connects, and the negative pole of the first diode is connected with accumulator battery positive pole.
Described discharge loop circuit includes audion, relay, discharge diode, fly-wheel diode and inspection switch, institute
The base stage stating audion is connected with the outfan of comparison circuit by the second resistance, the grounded emitter of audion, audion
Colelctor electrode connects 12V DC source by the coil of relay, and the coil two ends of relay are parallel with fly-wheel diode, Qi Zhongxu
The negative pole of stream diode connects 12V DC source, and the static contact of relay normally open contact is connected with the positive pole of discharge diode, puts
The negative pole of electric diode is connected with the positive power source terminal of PLC device, the moving contact of relay normally open contact and one end of inspection switch
Connecting, the inspection switch other end is connected with the positive pole of accumulator battery.
Described discharge loop circuit also includes light emitting diode, and the positive pole of light emitting diode is by the first resistance and afterflow two
The negative pole of pole pipe connects, and the positive pole of light emitting diode connects 12V DC source by the first resistance, the negative pole of light emitting diode and three
The colelctor electrode of pole pipe connects.
Described reference voltage stabilizing source circuit includes three-terminal voltage-stabilizing chip, the 5th divider resistance, the 6th divider resistance and the first pole
Property electric capacity, the described input of three-terminal voltage-stabilizing chip is connected with the positive pole of accumulator battery, the earth terminal ground connection of three-terminal voltage-stabilizing chip,
The outfan output 12V DC source of three-terminal voltage-stabilizing chip, the outfan of three-terminal voltage-stabilizing chip is just connecting the first polar capacitor
Pole, the minus earth of the first polar capacitor；The outfan of three-terminal voltage-stabilizing chip is by the 5th divider resistance that is connected in series and the
Six divider resistance ground connection, the junction point of the 5th divider resistance and the 6th divider resistance is connected with the inverting input of comparison circuit.
Described comparison circuit includes operational amplifier, the 3rd resistance, the 4th resistance and the second polar capacitor, operational amplifier
In-phase input end be connected with the positive pole of accumulator battery by the 3rd resistance, in-phase input end is also by the 4th resistance and accumulator
The negative pole of group connects, and the in-phase input end of operational amplifier also positive pole with the second polar capacitor is connected, and described second polarity is electric
The minus earth held；The power supply termination 12V DC source of operational amplifier, the earth terminal ground connection of operational amplifier, operation amplifier
The outfan of device is connected with the base stage of audion with by the second resistance.
Described accumulator battery includes the accumulator of two 1A/12V connected.
Described three-terminal voltage-stabilizing chip is voltage stabilizing chip 7812.
Described operational amplifier is LM358.
Compared with prior art, the beneficial effects of the utility model are:
1, the PLC standby power supply module in this utility model PLC main power source module can not normal power supply time, automatically switch
Powered by PLC standby power supply module, it is not necessary to manually operate；PLC standby power supply module volume is little, and circuit structure is simple, when
During PLC main power source module normal power supply, the positive power source terminal of PLC device is battery charging by the first diode, accumulator
There is voltage in group itself, charging current is little, will not impact the 24V Switching Power Supply powered to PLC device；Because of the one or two
There is pressure drop in pole pipe, the voltage above accumulator battery can only high charge to about 23.5V, then higher position stop charging, now
Accumulator battery is at floating charge state；The effect of reference voltage stabilizing source circuit is: on the one hand provide reference voltage for comparison circuit；Separately
On the one hand it is to provide 12V DC supply for the relay in the operational amplifier in comparison circuit and discharge loop circuit；
Comparison circuit is that after reference voltage and accumulator battery both end voltage being compared, output one controls voltage, this control voltage control
Triode ON in discharge loop circuit processed；I.e. whether control discharge loop circuit ON；When discharge loop circuit ON,
If PLC main power source module energy normal power supply, now, although relay is in attracting state, but accumulator battery both end voltage is low
In outside 24V voltage, discharge diode is in cut-off state, accumulator battery not supplying power for outside；Only too low not when external voltage
The when of stablizing, discharge diode turns on, and PLC device just can be powered by PLC standby power supply module；Whole power switching does not affects
PLC device is properly functioning；When needs power-off is overhauled, inspection switch is disconnected, PLC standby power supply module can be made no longer to discharge,
Avoid the occurrence of unnecessary problem；
2, the light emitting diode in this utility model is relay relay indicating light, when relay obtains electric, and light-emitting diodes
Pipe conducting luminescence；
3, the effect of the reference voltage stabilizing source circuit in this utility model has two, and first provides benchmark electricity for comparison circuit
Pressure, when accumulator battery both end voltage changes, remains able to provide for comparison circuit stablize constant reference voltage；Second
Being to provide 12V DC supply for the relay in the operational amplifier in comparison circuit and discharge loop circuit, circuit is tied
Structure is simple；
4, in order to avoid accumulator battery over-discharge, the in-phase input end of operational amplifier passes through the 3rd resistance and accumulator
The positive pole of group connects, and the in-phase input end of operational amplifier is connected with the negative pole of accumulator battery by the 4th resistance, the 3rd resistance
Bleeder circuit is become with the 4th resistor group, when accumulator battery both end voltage is equal to 20V, the 3rd resistance and the 4th ohmically dividing potential drop
Value is 5V voltage, and when accumulator battery voltage is higher than 20V, operational amplifier output high level, this level is added by the second resistance
In the base stage of audion, triode ON, the coil of relay obtains electric, normally opened contact adhesive, discharge loop circuit ON；When
When accumulator battery both end voltage is less than 20V, operational amplifier output low level, relay electric-loss, discharge loop circuit stops putting
Electricity, to prevent accumulator battery overdischarge.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the PLC standby power supply module in this utility model.
Detailed description of the invention
The utility model discloses a kind of uninterrupted voltage-stabilizing power supply system of PLC, as it is shown in figure 1, power for PLC device
PLC main power source module and PLC standby power supply module, the directly power taking from electrical network electric power system of PLC main power source module, PLC is standby
Power module includes accumulator battery BT1, charge circuit circuit, reference voltage stabilizing source circuit, comparison circuit and discharge loop circuit, stores
Set of cells BT1 includes the accumulator of two 1A/12V connected, and volume is little, owing to when PLC device works, electric current is the least, and two storages
Voltage after battery series connection is just 24V, consistent with PLC device power supply.Charge circuit circuit includes the first diode D1,
First diode D1 positive pole is connected with the positive power source terminal of PLC device, the earth terminal ground connection of PLC device；First diode D1 negative pole
It is connected with accumulator battery BT1 positive pole, accumulator battery BT1 minus earth, when PLC main power source module is normally powered for PLC device,
The positive power source terminal of PLC device is that accumulator battery BT1 is charged by the first diode D1；Accumulator battery BT1 and reference voltage stabilizing source electricity
The input on road connects.
Reference voltage stabilizing source circuit includes three-terminal voltage-stabilizing chip U2, the 5th divider resistance R5, the 6th divider resistance R6 and first
Polar capacitor C1, three-terminal voltage-stabilizing chip U2 use voltage stabilizing chip 7812 model, the input of three-terminal voltage-stabilizing chip U2 and accumulator
The positive pole of group BT1 connects, the earth terminal ground connection of three-terminal voltage-stabilizing chip U2, the outfan output 12V direct current of three-terminal voltage-stabilizing chip U2
Power supply, provides stable operating voltage for the operating die in comparison circuit and discharge loop circuit.Three-terminal voltage-stabilizing chip U2's is defeated
Go out the positive pole that end connects the first polar capacitor C1, the minus earth of the first polar capacitor C1；The outfan of three-terminal voltage-stabilizing chip U2
It is concatenated the 5th divider resistance R5 and the 6th divider resistance R6 ground connection, the 5th divider resistance R5 and the 6th divider resistance R6 connected
Composition bleeder circuit, the junction point of the 5th divider resistance R5 and the 6th divider resistance R6 is connected with comparison circuit, for comparison circuit
Thering is provided a reference voltage, when accumulator battery BT1 both end voltage changes, reference voltage does not changes.
Comparison circuit includes operational amplifier U1, the 3rd resistance R3, the 4th resistance R4 and the second polar capacitor C2, and computing is put
Big device uses LM358 amplifier chip, and the inverting input of operational amplifier U1 passes through the 6th divider resistance R6, the 5th divider resistance
R5 is connected with the outfan of three-terminal voltage-stabilizing chip U2, the power supply termination 12V DC source of operational amplifier U1, operational amplifier U1
Earth terminal ground connection, the in-phase input end of operational amplifier U1 is connected with the positive pole of accumulator battery BT1 by the 3rd resistance R3, transports
The in-phase input end calculating amplifier U1 is connected with the negative pole of accumulator battery BT1 by the 4th resistance R4, the 3rd resistance R3 and the 4th
Resistance R4 forms bleeder circuit, and the in-phase input end of operational amplifier U1 also positive pole with the second polar capacitor C2 is connected, and second
The minus earth of polar capacitor C2, the second polar capacitor C2 is filter capacitor, and the voltage after dividing potential drop is filtered through the second polar capacitor C2
Being added to the in-phase input end of operational amplifier U1 after ripple, the reference voltage of inverting input is inputted by operational amplifier U1 with homophase
After terminal voltage compares, output controls voltage, and the outfan of comparison circuit is connected with discharge loop circuit.
Discharge loop circuit includes that audion Q1, relay J DQ1, discharge diode D2, sustained diode 3 and maintenance are left
Closing S1, the base stage of audion Q1 is connected with the outfan of comparison circuit by the second resistance R2, the grounded emitter of audion Q1,
The colelctor electrode of audion Q1 connects 12V DC source by the coil of relay J DQ1, and the coil two ends of relay J DQ1 are in parallel
There are sustained diode 3, the wherein colelctor electrode of the positive pole connecting triode Q1 of sustained diode 3；Relay J DQ1 normally opened contact
Static contact be connected with the positive pole of discharge diode D2, the negative pole of discharge diode D2 is connected with the positive power source terminal of PLC device, continues
The moving contact of electrical equipment JDQ1 normally opened contact is connected with one end of inspection switch S1, the inspection switch S1 other end and accumulator battery BT1
Positive pole connect.
Discharge loop circuit also includes LED 1, the positive pole of LED 1 by the first resistance R1 with
The negative pole of sustained diode 3 connects, and the negative pole of LED 1 is connected with the colelctor electrode of audion Q1.
Operation principle: when PLC main power source module normal power supply, the positive power source terminal of PLC device passes through the first diode D1
Charging for accumulator battery BT1, now, accumulator battery BT1 both end voltage exports high level, three poles higher than 20V, operational amplifier U1
Pipe Q1 turns on, and relay J DQ1 obtains electric normally opened contact and closes, discharge loop circuit ON, but due to discharge diode D2 negative electricity
Pressure is higher than cathode voltage, and discharge diode D2 is in cut-off state, although therefore now discharge loop circuit ON, but PLC is standby
PLC device is not powered by power module.
When PLC main power source module occur the fault such as short circuit, tripping operation, voltage pulsation can not normal power supply time, now discharge two
Pole pipe D2 cathode voltage is higher than cathode voltage, and discharge diode D2 turns on, and automatically switches into by PLC standby power supply module PLC
Equipment is powered, and it is properly functioning that handoff procedure does not interferes with PLC device；In order to protect accumulator battery BT1, when accumulator battery BT1 two
When terminal voltage is less than 20V, operational amplifier U1 output low level, relay J DQ1 dead electricity, discharge loop circuit stops electric discharge, with
Prevent the overdischarge of accumulator battery BT1, reach to protect the purpose of accumulator battery BT1.
When needs power-off is overhauled, inspection switch S1 is disconnected, PLC standby power supply module can be made no longer to discharge, it is to avoid go out
Existing unnecessary problem.
Claims (9)
1. the uninterrupted voltage-stabilizing power supply system of PLC, including the PLC main power source module powered for PLC device and PLC standby electricity
Source module, the directly power taking from electrical network electric power system of described PLC main power source module, it is characterised in that: described PLC stand-by power supply mould
Block includes accumulator battery, charge circuit circuit, reference voltage stabilizing source circuit, comparison circuit and discharge loop circuit, and described charging is returned
Road circuit input end is connected with the positive power source terminal of PLC device；Described charge circuit circuit output end is connected with accumulator battery positive pole,
Described accumulator battery minus earth；Described accumulator battery is connected with the input of reference voltage stabilizing source circuit, described reference voltage stabilizing source
The outfan of circuit is connected with comparison circuit input, provides reference voltage, the outfan of described comparison circuit for comparison circuit
Being connected with the input of discharge loop circuit, the described outfan of discharge loop circuit is connected with the positive power source terminal of PLC device.
2. the uninterrupted voltage-stabilizing power supply system of PLC as claimed in claim 1, it is characterised in that: described charge circuit circuit bag
Including the first diode, the described positive pole of the first diode is connected with the positive power source terminal of PLC device, the negative pole of the first diode and storage
Battery anode connects.
3. the uninterrupted voltage-stabilizing power supply system of PLC as claimed in claim 2, it is characterised in that: described discharge loop circuit bag
Including audion, relay, discharge diode, fly-wheel diode and inspection switch, the base stage of described audion passes through the second resistance
Being connected with the outfan of comparison circuit, the grounded emitter of audion, the colelctor electrode of audion is connected by the coil of relay
12V DC source, the coil two ends of relay are parallel with fly-wheel diode, and wherein the negative pole of fly-wheel diode connects 12V direct current
Power supply, the static contact of relay normally open contact is connected with the positive pole of discharge diode, the negative pole of discharge diode and PLC device
Positive power source terminal connects, and the moving contact of relay normally open contact is connected with one end of inspection switch, the inspection switch other end and electric power storage
The positive pole of pond group connects.
4. the uninterrupted voltage-stabilizing power supply system of PLC as claimed in claim 3, it is characterised in that: described discharge loop circuit is also
Including light emitting diode, the positive pole of light emitting diode is connected with the negative pole of fly-wheel diode by the first resistance, light emitting diode
Positive pole connect 12V DC source by the first resistance, the negative pole of light emitting diode is connected with the colelctor electrode of audion.
5. the uninterrupted voltage-stabilizing power supply system of PLC as claimed in claim 4, it is characterised in that: described reference voltage stabilizing source circuit
Including three-terminal voltage-stabilizing chip, the 5th divider resistance, the 6th divider resistance and the first polar capacitor, described three-terminal voltage-stabilizing chip defeated
Enter end to be connected with the positive pole of accumulator battery, the earth terminal ground connection of three-terminal voltage-stabilizing chip, the outfan output 12V of three-terminal voltage-stabilizing chip
DC source, the outfan of three-terminal voltage-stabilizing chip connects the positive pole of the first polar capacitor, the minus earth of the first polar capacitor；Three
The outfan of end voltage stabilizing chip by the 5th divider resistance that is connected in series and the 6th divider resistance ground connection, the 5th divider resistance and
The junction point of the 6th divider resistance is connected with the input of comparison circuit.
6. the uninterrupted voltage-stabilizing power supply system of PLC as claimed in claim 5, it is characterised in that: described comparison circuit includes fortune
Calculate amplifier, the 3rd resistance, the 4th resistance and the second polar capacitor, the inverting input of operational amplifier and the 5th divider resistance
Connecting with the junction point of the 6th divider resistance, the in-phase input end of operational amplifier is by the positive pole of the 3rd resistance with accumulator battery
Connect, in-phase input end is connected with the negative pole of accumulator battery also by the 4th resistance, the in-phase input end of operational amplifier also with
The positive pole of the second polar capacitor connects, the minus earth of described second polar capacitor；The power supply termination 12V direct current of operational amplifier
Power supply, the earth terminal ground connection of operational amplifier, the outfan of operational amplifier connects with by the base stage of the second resistance with audion
Connect.
7. the uninterrupted voltage-stabilizing power supply system of PLC as claimed in claim 1, it is characterised in that: described accumulator battery includes two
The accumulator of the 1A/12V of individual series connection.
8. the uninterrupted voltage-stabilizing power supply system of PLC as claimed in claim 5, it is characterised in that: described three-terminal voltage-stabilizing chip is
Voltage stabilizing chip 7812.
9. the uninterrupted voltage-stabilizing power supply system of PLC as claimed in claim 6, it is characterised in that: described operational amplifier is
LM358。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620800460.7U CN205846858U (en) | 2016-07-28 | 2016-07-28 | A kind of uninterrupted voltage-stabilizing power supply system of PLC |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620800460.7U CN205846858U (en) | 2016-07-28 | 2016-07-28 | A kind of uninterrupted voltage-stabilizing power supply system of PLC |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205846858U true CN205846858U (en) | 2016-12-28 |
Family
ID=57641541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620800460.7U Expired - Fee Related CN205846858U (en) | 2016-07-28 | 2016-07-28 | A kind of uninterrupted voltage-stabilizing power supply system of PLC |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205846858U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112018875A (en) * | 2020-08-27 | 2020-12-01 | 临沂会宝岭铁矿有限公司 | PLC uninterrupted power supply device of mining electric locomotive |
-
2016
- 2016-07-28 CN CN201620800460.7U patent/CN205846858U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112018875A (en) * | 2020-08-27 | 2020-12-01 | 临沂会宝岭铁矿有限公司 | PLC uninterrupted power supply device of mining electric locomotive |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161228 Termination date: 20210728 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |