CN109728711A - A kind of contactor electricity saver circuit and its control method - Google Patents
A kind of contactor electricity saver circuit and its control method Download PDFInfo
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- CN109728711A CN109728711A CN201811585897.3A CN201811585897A CN109728711A CN 109728711 A CN109728711 A CN 109728711A CN 201811585897 A CN201811585897 A CN 201811585897A CN 109728711 A CN109728711 A CN 109728711A
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Abstract
The invention discloses a kind of contactor electricity saver circuit and its control method, the contactor electricity-saving appliance includes: contactor, sustained diode, resonant inductance Lr and N-MOS switching tube Q；The cathode of diode D and the tie point of contactor one end are used to connect bus Vin, and the anode of diode D1 and one end of resonant inductance Lr are commonly connected to the contactor other end；The drain electrode of the other end connection N-MOS switching tube Q of resonant inductance Lr, the source electrode ground connection of N-MOS switching tube Q.The present invention is interacted using the parasitic capacitance Cr of the turn-to-turn capacitance CL or N-MOS switching tube Q in resonant inductance Lr and contactor, the electric current of N-MOS switching tube is allowed to lag behind the variation of voltage, to obtain the effect of zero current turning-on, significantly reduce electricity-saving appliance loss.
Description
Technical field
The present invention relates to contactor, in particular to a kind of low-loss electricity-saving appliance topological circuit.
Background technique
Both ends subnet is formed after the circuit model of contactor such as Fig. 1, contactor coil inductance L and contactor internal resistance RL series connection
Network, turn-to-turn capacitance CL are in parallel with both ends sub-network.Traditional contactors electricity saver circuit model, as shown in Fig. 2, being continued by contactor
Flow diode D, metal-oxide-semiconductor Q composition.After metal-oxide-semiconductor Q is opened, it is in the excitation stage, excitation voltage Vin, inductive current IL increase；
After metal-oxide-semiconductor Q shutdown, inductive current reduces under the internal resistance pressure drop of contactor and the pressure drop of sustained diode, is in demagnetization rank
Section, demagnetization voltage be IL*RL+VF, inductance each cycle voltage-second balance, Vin*T*D=(1-T) * D* (IL*RL+VF) wherein, IL line
Enclose inductive current, VF freewheeling diode conduction voltage drop, T switch periods, D duty ratio.Pass through voltage-second balance formula, it is easy to obtain
Control duty ratio can control coil electric current conclusion.
The GATE pin of Fig. 2 electricity route test chip is realized to the gate input control signal of metal-oxide-semiconductor Q and is controlled, and is being controlled
During circuital current, metal-oxide-semiconductor Q with needing high-frequency turn-on and turn-off.Fig. 3 show Fig. 2 circuit metal-oxide-semiconductor drain-source voltage
VDS, drain current IDS, coil current IL, coil voltage UL, miscellaneous capacitance current ICL waveform, in each switching process
Inductive load characteristic, it may appear that the reduction of VDS voltage, IL electric current rise overlapping, this loss is normal node state conversion
Necessary process.But when metal-oxide-semiconductor VDS voltage reduces in opening process, the voltage on turn-to-turn capacitance CL generates mutation, capacitor CL
It is upper to generate very big electric current moment, and this immediate current is much larger than contactor running current, and this electric current is worked
It can not be eliminated in journey, be superimposed upon on normal inductive current and will increase great turn-on consumption.Input voltage is higher, and loss is bigger,
But switching loss caused by turn-to-turn capacitance is not but the necessary condition of circuit state conversion, but increases the loss of circuit
System heat generation is caused to increase.
Current existing contactor electricity-saving appliance is all made of circuit most basic shown in Fig. 2, by above-mentioned analysis it is found that the electricity
Road is defective, especially for when high voltage, according to capacitance characteristic formula:It is easy to obtain in contactor turn-to-turn capacitance
The capacitance current of the bigger generation of voltage jump is bigger, at the time of this electric current appears in metal-oxide-semiconductor VDS voltage close to input voltage,
Such high current and high pressure appear on metal-oxide-semiconductor simultaneously, and the loss of metal-oxide-semiconductor opening process increases, and cause metal-oxide-semiconductor fever serious same
When, electricity-saving appliance overall losses increase.
Summary of the invention
Have in view of that, technical problem solved by the invention is to provide a kind of contactor electricity saver circuit, can be significantly
Reduce the loss of contactor electricity-saving appliance.
The technical scheme to solve the above technical problems is that
A kind of contactor electricity saver circuit, characterized by comprising: contactor, sustained diode, resonant inductance Lr and N-
MOS switch pipe Q；The tie point of one end of the cathode and contactor of sustained diode is for connecting bus Vin, freewheeling diode
The anode of D1 and one end of resonant inductance Lr are commonly connected to the other end of contactor；The other end of resonant inductance Lr connects N-
The drain electrode of MOS switch pipe Q, the source electrode ground connection of N-MOS switching tube Q.
Above-mentioned technical proposal is resonant inductance Lr and contactor turn-to-turn capacitance or the hourglass source electrode parasitism of N-MOS switching tube Q
Capacitor resonance.
The first alternative solution as above-mentioned technical proposal, it is characterised in that further include: a capacitor, the capacitor are in parallel
At the both ends of contactor.This alternative solution is to realize goal of the invention by the capacitor and resonant inductance Lr resonance.
Second of alternative solution as above-mentioned technical proposal, it is characterised in that further include: a capacitor, the capacitor are in parallel
Between the drain electrode and source electrode of N-MOS switching tube Q.This alternative solution is similarly to be realized by the capacitor and resonant inductance Lr resonance
Goal of the invention.
Accordingly, the present invention also provides the first control methods of above-mentioned contactor electricity saver circuit, it is characterised in that:
After the drain-source voltage decline of N-MOS switching tube, electric current just flows through N-MOS switching tube Q.This control method is able to achieve N-MOS switch
In pipe Q opening process, the turn-to-turn capacitance CL resonance of resonant inductance Lr and contactor, allow electric current in turn-to-turn capacitance CL not exclusively and
The voltage at N-MOS switching tube Q drain-source end is overlapping.
Preferably, N-MOS switching tube Q is just opened after the drain-source voltage of N-MOS switching tube drops to 0V.It at this time can be complete
Avoid the voltage of the electric current and N-MOS switching tube Q drain-source end in turn-to-turn capacitance CL overlapping entirely.
Further, the driving speed of MOS switch pipe Q will be more than the resonance current rate of climb.
Accordingly, the present invention also provides second of control methods of above-mentioned contactor electricity saver circuit, it is characterised in that:
N-MOS switching tube Q is just opened when electric current in resonant inductance Lr is reversed.This control method is able to achieve resonant inductance Lr and N-
The drain-source end parasitic capacitance Cr of MOS switch pipe Q forms resonance soft switch circuit.
The working principle of the invention will carry out analytic explanation in conjunction with specific embodiments, available beneficial using the present invention
Effect is that electricity-saving appliance loss can be greatly lowered, and effect is obvious under wide-range input voltage.Circuit is simple, at low cost.
Detailed description of the invention
Fig. 1 is contactor circuit model；
Fig. 2 is common contactor electricity-saving appliance main power circuit；
Fig. 3 Fig. 2 circuit working timing figure；
Fig. 4 is contactor electricity saver circuit of the present invention and first embodiment contactor electricity saver circuit figure；
Fig. 5 is circuit working timing figure in first embodiment of the invention；
Fig. 6 is second embodiment of the invention contactor electricity saver circuit；
Fig. 7 is second embodiment of the invention contactor electricity-saving appliance working timing figure.
Specific embodiment
In order to which the present invention is more clearly understood, with reference to the accompanying drawings and embodiments, the present invention is described in more detail.
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
First embodiment
Referring to Fig. 4, being the contactor electricity saver circuit schematic diagram of first embodiment of the invention, the contactor of the present embodiment
Electricity saver circuit (is equivalent to contactor coil inductance L, contactor coil turn-to-turn capacitance CL, contactor coil internal resistance by contactor
RL), sustained diode, N-MOS switching tube Q and resonant inductance Lr composition, the company of one end of the cathode and contactor of diode D
Contact is commonly connected to the other end of contactor for connecting bus Vin, the anode of diode D1 and one end of resonant inductance Lr；
The drain electrode of the other end connection N-MOS switching tube Q of resonant inductance Lr, the source electrode ground connection of N-MOS switching tube Q.
The control strategy that the present embodiment is taken are as follows: just open N- after the drain-source voltage of N-MOS switching tube drops to 0V
MOS switch pipe Q.Working principle is as follows:
N-MOS switching tube Q opening process is in band inductive load, due to the feature that inductive current cannot be mutated, through whole
A system duty cycle, in N-MOS switching tube Q opening process, the electric current IL of coil inductance L first is transferred to from diode D
In metal-oxide-semiconductor Q, followed by the reduction of the drain-source voltage of N-MOS switching tube can during N-MOS switching tube Q drain-source voltage reduces
To be easy to obtain: VL=VCL=Vin-VDS.It will lead to turn-to-turn capacitance CL voltage jump, turn-to-turn capacitance CL voltage jump can make
Turn-to-turn capacitance CL generates very big peak current and flows through N-MOS switching tube Q, so that N-MOS switching tube Q generation is very big open-minded
Loss.In order to reduce N-MOS switching tube Q because of the loss that turn-to-turn capacitance CL is generated, in N-MOS switching tube Q and turn-to-turn capacitance CL
Between connect a resonant inductance Lr, reduce the speed that turn-to-turn capacitance CL generates electric current, allow the drain-source voltage of N-MOS switching tube
VDS is dropped to after 0V, and the drain-source current IDS of N-MOS switching tube just starts to increase, and this scheme, which can be substantially reduced, opens damage
Consumption.
The present embodiment course of work waveform is shown in Fig. 3, the present embodiment can be realized it is following the utility model has the advantages that
In N-MOS switching tube Q opening process, the turn-to-turn capacitance CL and resonant inductance Lr interaction in contactor makes to flow
The electric current for crossing N-MOS switching tube appears in its drain-source voltage and drops to after 0V, that is, the electric current of N-MOS switching tube is allowed to lag behind electricity
The variation of pressure, so that the effect of zero current turning-on is obtained, to significantly reduce electricity-saving appliance loss.
In N-MOS switching tube Q turn off process, because having the presence of turn-to-turn capacitance CL, it can be achieved that zero voltage turn-off, shutdown
The continuous current circuit of moment, the electric current IL of contactor coil inductance L are transferred on turn-to-turn capacitance CL, meet N-MOS switch tube zero electricity
The condition of shutdown is pressed, itself is lossless, it makes a concrete analysis of as follows:
N-MOS switching tube turns off the moment, and contactor coil electric current needs continuous current circuit, there is two paths at this time, and L → RL →
D and L → RL → CL.Wherein diode D anode voltage must reach VIN+VF voltage when the L → RL → circuit D conducting, this it
Before, the path that electric current is walked is L → RL → circuit CL, and IL electric current charges to capacitor CL, until CL both end voltage is equal to VIN+VF's
When, walk L → RL → circuit D.During electric current is transferred to diode D continuous current circuit from turn-to-turn capacitance CL continuous current circuit, circle
Between capacitor CL voltage begun to ramp up from 0V, N-MOS switching tube Q has been in close state at this time, and turn-off power loss is greatly reduced.
Therefore the present embodiment with zero voltage turn-off can be achieved in turn off process, turn-off power loss itself is relatively low.
The driving speed of the present embodiment MOS switch pipe Q is more than contactor turn-to-turn capacitance CL and resonant inductance Lr resonance current
The rate of climb thus turn-to-turn capacitance CL just can have big electric current to appear in MOS to open after the reduction of MOS switch pipe Q drain-source voltage
It closes on pipe Q, to reduce loss.
Illustrate effect of the invention below by way of actual test data.It is real in the range of 250Vac~500Vac
Border system loss significantly reduces, such as the following table 1:
Power consumption under the different input voltages of table 1
| Input voltage | Power consumption (W) before Fig. 2 is improved | Power consumption (W) after Fig. 4 present invention improves |
| 250Vac | 1.45 | 0.55 |
| 300Vac | 2.06 | 0.75 |
| 400Vac | 3.48 | 1.19 |
| 500Vac | 5.30 | 1.79 |
It should be noted that utilize is turn-to-turn capacitance CL and resonant inductance Lr resonance, if connecing for the present embodiment
One capacitor of tentaculum both ends parallel connection, it is humorous using the capacitor and resonant inductance Lr of the parallel connection to substitute the effect of turn-to-turn capacitance CL
Vibration, equally may be implemented goal of the invention.
Second embodiment
The present embodiment such as Fig. 6, the present embodiment are different from the first embodiment in the drain-source using N-MOS switching tube Q
The resonant relationship of pole parasitic capacitance Cr and resonant inductance Lr, the electric current in resonant inductance Lr are opened N-MOS when reversed and are opened
Pipe Q is closed, can also easily realize that no-voltage is open-minded, to reduce turn-on consumption.Below with reference to Fig. 7, circuit debugging process is analyzed.
Opening process: it is open-minded why to be able to achieve no-voltage, analyzes curent change, MOS obtaining the t0 moment shown in Fig. 7
After switching tube Q shutdown, resonant inductance Lr and coil inductance L give parasitic capacitance Cr to charge jointly, when the t1 of diode D conducting
It carves, parasitic capacitance Cr is by constant current charge, the end parasitic capacitance Cr voltage U during thisCrRise, the rate of riseTwo
After pole pipe D is connected, by diode D afterflow, parasitic capacitance Cr, resonant inductance Lr and bus Vin voltage are formed coil inductance L
Resonant tank, in resonant process, resonant inductance Lr charges to parasitic capacitance Cr, the end parasitic capacitance Cr voltage UCrConstantly rise, line
Enclose the electric current I in inductance LLrConstantly decline, until the electric current I in the t2 moment, coil inductance LLrDrop to zero, parasitic capacitance Cr
Hold voltage UCrReach resonance peak.After the t2 moment, parasitic capacitance Cr discharges to resonant inductance Lr, the electric current in coil inductance L
ILrChange direction, the end parasitic capacitance Cr voltage UCrConstantly decline, until the t3 moment, UCr=Vin, at this moment both ends resonant inductance Lr
Voltage is zero, the electric current I in coil inductance LLrReach reversed resonance peak.After the t3 moment, resonant inductance Lr is to parasitic capacitance Cr
Reverse charging, the end parasitic capacitance Cr voltage UCrContinue to decline, until t4 moment UCr=0.The end parasitic capacitance Cr voltage U after t4CrQuilt
Reverse current clamper, the conducting of MOS switch pipe Q body diode, resonant inductance Lr both end voltage are Vin, the electric current in coil inductance L
ILrIt is linear to reduce, until the t5 moment, ILr=0, MOS switch pipe Q pressure drop is zero during t4~t5, allows MOS switch pipe during this
Q conducting, is achieved that no-voltage is open-minded.
Turn off process: because there is the presence of parasitic capacitance Cr, MOS switch pipe Q voltage change speed, therefore MOS can be reduced
Switching tube Q loss reduces, and both turn off process working mechanism is identical with the first embodiment, and realizes the principle of zero voltage turn-off herein
It does not repeat.
It should be noted that utilize is parasitic capacitance Cr and resonant inductance Lr resonance, such as in MOS for the present embodiment
The hourglass source electrode of a switching tube Q capacitor in parallel, using the capacitor and resonant inductance Lr resonance of the parallel connection, to substitute parasitic capacitance
The effect of Cr, equally may be implemented goal of the invention.
The above is only the preferred embodiment of the present invention, it is noted that above-mentioned preferred embodiment is not construed as pair
Limitation of the invention, protection scope of the present invention should be defined by the scope defined by the claims..For the art
For those of ordinary skill, without departing from the spirit and scope of the present invention, several improvements and modifications can also be made, these change
It also should be regarded as protection scope of the present invention into retouching.
Claims (7)
1. a kind of contactor electricity saver circuit, characterized by comprising: contactor, sustained diode, resonant inductance Lr and N-
MOS switch pipe Q；The tie point of one end of the cathode and contactor of sustained diode is for connecting bus Vin, freewheeling diode
The anode of D1 and one end of resonant inductance Lr are commonly connected to the other end of contactor；The other end of resonant inductance Lr connects N-
The drain electrode of MOS switch pipe Q, the source electrode ground connection of N-MOS switching tube Q.
2. contactor electricity saver circuit according to claim 1, it is characterised in that further include: a capacitor, the capacitor is simultaneously
It is associated in the both ends of contactor.
3. contactor electricity saver circuit according to claim 1, it is characterised in that further include: a capacitor, the capacitor is simultaneously
It is associated between the drain electrode and source electrode of N-MOS switching tube Q.
4. a kind of control method of contactor electricity saver circuit as claimed in claim 1 or 2, it is characterised in that: in N-MOS switching tube
Drain-source voltage decline after, electric current just flows through N-MOS switching tube Q.
5. the control method of contactor electricity saver circuit according to claim 4, it is characterised in that: in N-MOS switching tube
Drain-source voltage just opens N-MOS switching tube Q after dropping to 0V.
6. the control method of contactor electricity saver circuit according to claim 4, it is characterised in that: the driving of MOS switch pipe Q
Speed will be more than the resonance current rate of climb.
7. a kind of control method of claim 1 or 3 contactor electricity saver circuit, it is characterised in that: in resonant inductance Lr
In electric current it is reversed when just open N-MOS switching tube Q.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811585897.3A CN109728711B (en) | 2018-12-24 | 2018-12-24 | Contactor electricity saver circuit and control method thereof |
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| CN201811585897.3A CN109728711B (en) | 2018-12-24 | 2018-12-24 | Contactor electricity saver circuit and control method thereof |
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| CN109728711B CN109728711B (en) | 2020-09-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110931312A (en) * | 2019-11-26 | 2020-03-27 | 广州金升阳科技有限公司 | Contactor power-saving control method and control circuit applying same |
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| CN110931312A (en) * | 2019-11-26 | 2020-03-27 | 广州金升阳科技有限公司 | Contactor power-saving control method and control circuit applying same |
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| CN109728711B (en) | 2020-09-15 |
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