CN107565509A - A kind of delay overcurrent turn-off function circuit for elevator switch power supply - Google Patents
A kind of delay overcurrent turn-off function circuit for elevator switch power supply Download PDFInfo
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- CN107565509A CN107565509A CN201710943865.5A CN201710943865A CN107565509A CN 107565509 A CN107565509 A CN 107565509A CN 201710943865 A CN201710943865 A CN 201710943865A CN 107565509 A CN107565509 A CN 107565509A
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Abstract
The invention discloses a kind of delay overcurrent turn-off function circuit for elevator switch power supply, including power circuit, reference voltage circuit, open-loop current amplifying circuit, charging current delay circuit, voltage comparator circuit, output current sample circuit, output current sample circuit includes sampling resistor J1, divider resistance, sampling resistor J1 right-hand member is connected with the negative output terminal VO on ground and Switching Power Supply, and left end passes through the positive output end VO+ connections of divider resistance and Switching Power Supply and is connected with one end of switching current amplifier；Reference voltage circuit includes power end, output end, earth terminal, the output end connection of power end and power circuit；The output end of open-loop current amplifying circuit is connected through the output end of overcharge current delay circuit and voltage comparator circuit, and the chip pin of pulse width of the output end of voltage comparator circuit with controlling integrated circuit is connected.The advantages of invention, is：The circuit has the characteristics of circuit is simple, protection is reliable, and precision is high.
Description
Technical field
The present invention relates to the technical field of automatic protection circuit, more particularly to a kind of delay for elevator switch power supply
Flow breaking circuit.
Background technology
Elevator requires of short duration overload capability with Switching Power Supply, but the overcurrent of simple increasing Switching Power Supply
Ability, danger can be triggered when overload fault occurs in apparatus for controlling elevator, so party in request proposes to switch in existing HF150W-S
Install power per liter delay protection circuit in power circuit additional.
The content of the invention
In order to overcome the above-mentioned deficiencies of the prior art, it is an object of the invention to solve how to protect elevator in the prior art
The problem of Switching Power Supply, therefore, the present invention provides a kind of delay overcurrent turn-off function circuit for elevator switch power supply.
To achieve the above object, the present invention uses following technical scheme：
A kind of delay overcurrent turn-off function circuit for elevator switch power supply, including power circuit, reference voltage circuit, open loop
Current amplification circuit, charging current delay circuit, voltage comparator circuit, output current sample circuit, the output current sampling
Circuit includes sampling resistor J1, divider resistance, and sampling resistor J1 right-hand member is connected with the negative output terminal VO- on ground and Switching Power Supply,
Left end passes through the positive output end VO+ connections of divider resistance and Switching Power Supply and is connected with one end of switching current amplifier；
The reference voltage circuit includes power end, output end, earth terminal, the output end of the power end and power circuit
Connection；
The open-loop current amplifying circuit includes operational amplifier IC4A, resistance R39, resistance R33, resistance R34, resistance
R35, resistance R38, potentiometer VR2, one end of the resistance R34 and resistance R35 one end are defeated with reference voltage circuit respectively
Go out end connection, the other end of resistance R34 is connected with operational amplifier IC4A negative input end, the resistance R35 other end and computing
Amplifier IC4A negative input end connection, sampling resistor J1 left end pass through resistance R39, potentiometer VR2 and operational amplifier
IC4A negative input end connection, operational amplifier IC4A positive input terminal are connected to ground by resistance R38；Operational amplifier IC4A
Output end through the output end of overcharge current delay circuit and voltage comparator circuit connect, the output of the voltage comparator circuit
Hold with controlling the chip pin of the pulse width of integrated circuit to be connected.
Optimization, the charging current delay circuit includes resistance R40, electric capacity C26, and the operational amplifier IC4A's is defeated
Go out end to be connected with resistance R40 right-hand member, resistance R40 left end is connected to ground by electrochemical capacitor C26.
Optimization, the voltage comparator circuit includes operational amplifier IC4B, diode D12, diode D16, resistance
Positive input terminal of R49, the resistance R40 left end also with operational amplifier IC4B is connected, operational amplifier IC4B output end
It is connected by diode D16 and resistance R49 with operational amplifier IC4B positive pole, also the input with diode D12 is connected, and two
Output end of the pole pipe D12 output end as voltage comparator circuit.
Optimization, the operational amplifier IC4A and operational amplifier IC4B form operational amplifier IC4, and the computing is put
Big device IC4 model LM358.
Optimization, the power circuit includes power supply chip IC2, electrochemical capacitor C14, input and the external world of power supply chip
Power supply connects, and the positive pole connection of the power end and electrochemical capacitor C14 of output end and reference voltage circuit, electrochemical capacitor C14's is negative
Pole is connected to ground.
Optimization, the model IM7812 of the power supply chip IC2.
Optimization, the reference voltage circuit includes resistance R33, three end adjustable voltage fiducial chip IC3, electric capacity C27, institute
The one end for stating resistance R33 is connected with three end adjustable voltage fiducial chip IC3 anode as power end, the other end and is used as benchmark
The output end of potential circuit, reference edge are connected with anode, and negative electrode is connected to ground, and electric capacity C27 is connected in parallel on three end adjustable voltage benchmark
Between the anode and negative electrode of chip IC 3.
Optimization, the model TL431 of the three ends adjustable voltage fiducial chip IC3.
Optimization, the delay time of the charging current delay circuit is the 3-9 seconds.
Optimization, the divider resistance includes resistance R47, resistance R48, and the output current sample circuit also includes resistance
R46, LED, the resistance R46 and LED are connected between the positive output end VO+ of Switching Power Supply and negative output terminal, and
The both ends of positive output end and negative output terminal are parallel with multiple electric capacity, and resistance R47 is connected in parallel with resistance R48, and in resistance R47
Both ends be parallel with multiple electric capacity.
This circuit of the invention is exclusively used in KA7500C, and as in the Switching Power Supply of power-supply controller of electric, having, circuit is simple, protects
Reliably, the characteristics of precision is high.
Brief description of the drawings
Fig. 1 is a kind of circuit diagram of delay overcurrent turn-off function circuit for elevator switch power supply of the present invention.
Embodiment
As shown in figure 1, a kind of delay overcurrent turn-off function circuit for elevator switch power supply, including power circuit, benchmark electricity
Volt circuit, open-loop current amplifying circuit, charging current delay circuit, voltage comparator circuit, output current sample circuit, it is described defeated
Going out current sampling circuit includes sampling resistor J1, divider resistance, sampling resistor J1 right-hand member and ground and the negative output of Switching Power Supply
Hold VO- connections, left end pass through the positive output end VO+ connections of divider resistance and Switching Power Supply and with switching current amplifier one
End connection；
The reference voltage circuit includes power end, output end, earth terminal, the output end of the power end and power circuit
Connection；
The open-loop current amplifying circuit includes operational amplifier IC4A, resistance R39, resistance R33, resistance R34, resistance
R35, resistance R38, potentiometer VR2, one end of the resistance R34 and resistance R35 one end are defeated with reference voltage circuit respectively
Go out end connection, the other end of resistance R34 is connected with operational amplifier IC4A negative input end, the resistance R35 other end and computing
Amplifier IC4A negative input end connection, sampling resistor J1 left end pass through resistance R39, potentiometer VR2 and operational amplifier
IC4A negative input end connection, operational amplifier IC4A positive input terminal are connected to ground by resistance R38；Operational amplifier IC4A
Output end through the output end of overcharge current delay circuit and voltage comparator circuit connect, the output of the voltage comparator circuit
Hold with controlling the chip pin of the pulse width of integrated circuit to be connected.Wherein resistance R34 and resistance R35 resistance are 22K Ω,
Resistance R39 resistance is 430 Ω, and potentiometer VR2 maximum value is 500 Ω, and resistance R38 resistance is 15 Ω.
The charging current delay circuit includes resistance R40, electric capacity C26, the output end of the operational amplifier IC4A with
Resistance R40 right-hand member connection, resistance R40 left end are connected to ground by electrochemical capacitor C26.Resistance R40 resistance is 220K Ω,
Electric capacity C26 capacitance is 100UF.The delay time of the charging current delay circuit is the 3-9 seconds.
The voltage comparator circuit includes operational amplifier IC4B, diode D12, diode D16, resistance R49, the electricity
Hinder positive input terminal of the R40 left end also with operational amplifier IC4B to be connected, operational amplifier IC4B output end passes through diode
D16 and resistance R49 are connected with operational amplifier IC4B positive pole, and also the input with diode D12 is connected, diode D12's
Output end of the output end as voltage comparator circuit.Wherein, resistance R49 resistance is 6.3K Ω, diode D12 and diode
D16 model 1N4148.
Operational amplifier IC4A and operational amplifier IC4B composition the operational amplifier IC4, the operational amplifier IC4
Model LM358.
The power circuit includes power supply chip IC2, electrochemical capacitor C14, and the input of power supply chip connects with extraneous power supply
Connect, the positive pole connection of the power end and electrochemical capacitor C14 of output end and reference voltage circuit, electrochemical capacitor C14 negative pole and ground
Connection.Electrochemical capacitor C14 capacitance is 100UF.The model IM7812 of the power supply chip IC2, power circuit output 12V electricity
Pressure.
The reference voltage circuit includes resistance R33, three end adjustable voltage fiducial chip IC3, electric capacity C27, the resistance
As power end, the other end is connected with three end adjustable voltage fiducial chip IC3 anode and is used as reference voltage electric for R33 one end
The output end on road, reference edge are connected with anode, and negative electrode is connected to ground, and electric capacity C27 is connected in parallel on three end adjustable voltage fiducial chip IC3
Anode and negative electrode between.The model TL431 of the three ends adjustable voltage fiducial chip IC3,2.5V base is provided for circuit
Quasi- voltage.
The divider resistance includes resistance R47, resistance R48, and the output current sample circuit also includes resistance R46, LED
Lamp, the resistance R46 and LED are connected between the positive output end VO+ of Switching Power Supply and negative output terminal, and in positive output end
Multiple electric capacity, respectively electric capacity C33, electrochemical capacitor C13, electrochemical capacitor C21, electrochemical capacitor are parallel with the both ends of negative output terminal
C22, resistance R47 are connected in parallel with resistance R48, and multiple electric capacity are parallel with resistance R47 both ends, and electric capacity is respectively to be electrolysed
Electric capacity C18 and electrochemical capacitor C19.
Switch power supply output current flows through current sampling resistor J1 and produces negative voltage in A points, by resistance R39, resistance
R34, potentiometer VR2 partial pressures, when output current exceedes the power per liter current set point 7A of setting, B points are operational amplifier
The current potential of IC4A output ends is down to below 0V, and the current potential of open-loop current amplifier out C points rises to 10V or so, to by electric capacity
The delay circuit of C2 and resistance R40 compositions charges to electrochemical capacitor C26, and the delay time of charging circuit is by resistance R40 and electrolysis
Electric capacity C26 and comparison voltage 2.5V determines that this programme sets the 3-9 seconds, when the voltage that D points are electrochemical capacitor C26 positive pole passes through
When charging (delay) is reached more than reference voltage 2.5V, by operational amplifier IC4B, diode D12, diode D16 and resistance
The voltage comparator circuit of R49 compositions in the output end output voltage that E points are diode D12 be 6V, and by diode D16 with
Resistance R49 carries out locking E point voltages so that output current continues to E level points after disappearing on current sampling resistor J11.
The preferred embodiment of the invention is these are only, is not intended to limit the invention creation, it is all in the present invention
All any modification, equivalent and improvement made within the spirit and principle of creation etc., should be included in the guarantor of the invention
Within the scope of shield.
Claims (10)
1. a kind of delay overcurrent turn-off function circuit for elevator switch power supply, it is characterised in that including power circuit, reference voltage
Circuit, open-loop current amplifying circuit, charging current delay circuit, voltage comparator circuit, output current sample circuit, the output
Current sampling circuit includes sampling resistor J1, divider resistance, sampling resistor J1 right-hand member and ground and the negative output terminal of Switching Power Supply
VO- connections, left end pass through divider resistance and the positive output end VO+ connections of Switching Power Supply and one end with switching current amplifier
Connection；
The reference voltage circuit includes power end, output end, earth terminal, and the output end of the power end and power circuit connects
Connect；
The open-loop current amplifying circuit includes operational amplifier IC4A, resistance R39, resistance R33, resistance R34, resistance R35, electricity
R38, potentiometer VR2 are hindered, the output end of one end of the resistance R34 and resistance R35 one end respectively with reference voltage circuit connects
Connect, the other end of resistance R34 is connected with operational amplifier IC4A negative input end, resistance the R35 other end and operational amplifier
IC4A negative input end connection, sampling resistor J1 left end are negative by resistance R39, potentiometer VR2 and operational amplifier IC4A's
Input is connected, and operational amplifier IC4A positive input terminal is connected to ground by resistance R38；Operational amplifier IC4A output end
Connected through the output end of overcharge current delay circuit and voltage comparator circuit, the output end of the voltage comparator circuit and control
The chip pin connection of the pulse width of integrated circuit.
A kind of 2. delay overcurrent turn-off function circuit for elevator switch power supply according to claim 1, it is characterised in that institute
Stating charging current delay circuit includes resistance R40, electric capacity C26, the output end of the operational amplifier IC4A and the resistance R40 right side
End connection, resistance R40 left end are connected to ground by electrochemical capacitor C26.
A kind of 3. delay overcurrent turn-off function circuit for elevator switch power supply according to claim 2, it is characterised in that institute
Stating voltage comparator circuit includes operational amplifier IC4B, diode D12, diode D16, resistance R49, a left side of the resistance R40
The positive input terminal also with operational amplifier IC4B is held to be connected, operational amplifier IC4B output end passes through diode D16 and resistance
R49 is connected with operational amplifier IC4B positive pole, and also the input with diode D12 is connected, diode D12 output end conduct
The output end of voltage comparator circuit.
A kind of 4. delay overcurrent turn-off function circuit for elevator switch power supply according to claim 3, it is characterised in that institute
State operational amplifier IC4A and operational amplifier IC4B composition operational amplifier IC4, the model of the operational amplifier IC4
LM358。
A kind of 5. delay overcurrent turn-off function circuit for elevator switch power supply according to claim 1, it is characterised in that institute
Stating power circuit includes power supply chip IC2, electrochemical capacitor C14, and the input of power supply chip is connected with extraneous power supply, output end with
The power end of reference voltage circuit is connected with electrochemical capacitor C14 positive pole, and electrochemical capacitor C14 negative pole is connected to ground.
A kind of 6. delay overcurrent turn-off function circuit for elevator switch power supply according to claim 5, it is characterised in that institute
State power supply chip IC2 model IM7812.
A kind of 7. delay overcurrent turn-off function circuit for elevator switch power supply according to claim 1, it is characterised in that institute
Stating reference voltage circuit includes resistance R33, three end adjustable voltage fiducial chip IC3, electric capacity C27, the resistance R33 one end work
For power end, the other end is connected with three end adjustable voltage fiducial chip IC3 anode and is used as the output end of reference voltage circuit,
Reference edge is connected with anode, and negative electrode is connected to ground, and electric capacity C27 is connected in parallel on three end adjustable voltage fiducial chip IC3 anode and the moon
Between pole.
A kind of 8. delay overcurrent turn-off function circuit for elevator switch power supply according to claim 7, it is characterised in that institute
State three end adjustable voltage fiducial chip IC3 model TL431.
A kind of 9. delay overcurrent turn-off function circuit for elevator switch power supply according to claim 7, it is characterised in that institute
The delay time for stating charging current delay circuit is the 3-9 seconds.
A kind of 10. delay overcurrent turn-off function circuit for elevator switch power supply according to claim 1, it is characterised in that
The divider resistance includes resistance R47, resistance R48, and the output current sample circuit also includes resistance R46, LED, described
Resistance R46 and LED are connected between the positive output end VO+ of Switching Power Supply and negative output terminal, and in positive output end and are born defeated
The both ends for going out end are parallel with multiple electric capacity, and resistance R47 is connected in parallel with resistance R48, and are parallel with resistance R47 both ends more
Individual electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710943865.5A CN107565509A (en) | 2017-10-11 | 2017-10-11 | A kind of delay overcurrent turn-off function circuit for elevator switch power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710943865.5A CN107565509A (en) | 2017-10-11 | 2017-10-11 | A kind of delay overcurrent turn-off function circuit for elevator switch power supply |
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| Publication Number | Publication Date |
|---|---|
| CN107565509A true CN107565509A (en) | 2018-01-09 |
Family
ID=60985418
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710943865.5A Pending CN107565509A (en) | 2017-10-11 | 2017-10-11 | A kind of delay overcurrent turn-off function circuit for elevator switch power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111342430A (en) * | 2020-03-23 | 2020-06-26 | 珠海格力电器股份有限公司 | Overcurrent protection circuit based on switching power supply output end |
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Patent Citations (7)
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| CN102170103A (en) * | 2011-03-24 | 2011-08-31 | 华为技术有限公司 | Electronic circuit breaker and processing method thereof |
| CN102858049A (en) * | 2011-06-30 | 2013-01-02 | 海洋王照明科技股份有限公司 | Over-current protection sampling circuit, light-emitting diode (LED) drive circuit and LED lamp |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111342430A (en) * | 2020-03-23 | 2020-06-26 | 珠海格力电器股份有限公司 | Overcurrent protection circuit based on switching power supply output end |
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Application publication date: 20180109 |
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| RJ01 | Rejection of invention patent application after publication |