CN103401441A - Rectification filter circuit and starting method thereof - Google Patents
Rectification filter circuit and starting method thereof Download PDFInfo
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- CN103401441A CN103401441A CN201310317346XA CN201310317346A CN103401441A CN 103401441 A CN103401441 A CN 103401441A CN 201310317346X A CN201310317346X A CN 201310317346XA CN 201310317346 A CN201310317346 A CN 201310317346A CN 103401441 A CN103401441 A CN 103401441A
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Abstract
The invention relates to a rectification filter circuit and a starting method thereof. The rectification filter circuit comprises a rectification circuit, a capacitor group, an electric reactor L1, a diode D1 and a switching tube T1, wherein the diode D1 is connected to the output end of the rectification circuit in parallel; the switching tube T1 is connected between the output end of the rectification circuit and the diode D1 in series; the electric reactor L1 is connected between the cathode of the diode D1 and the anode of the capacitor group; the anode of the diode D1 is connected with the cathode of the capacitor group. According to the starting method of the rectification filter circuit, the rectification circuit is controlled by the switching tube T1 to carry out periodic interval-type charging on the capacitor group. According to the rectification filter circuit disclosed by the invention, a starting resistor is replaced by the electric reactor L1, the diode D1 and the switching tube, a pulse signal is loaded to the gate pole of the switching tube T1, and the capacitor group is subjected to the periodic interval-type charging by the rectification circuit and the electric reactor L1. In the circuit starting process, the electric energy loss is low, the calorific value is small, and the safety is improved.
Description
Technical field
The present invention relates to power electronic equipment, relate in particular to a kind of current rectifying and wave filtering circuit and starting method thereof.
Background technology
bridge rectifier filter circuit is widely used in modern electronic equipment especially powerful device, due at this circuit powered on moment, characteristic based on capacitor element, its both end voltage can not be suddenlyd change, it is also powered on moment, electric capacity is equivalent to short-circuit condition, on whole rectifying and wave-filtering loop because internal resistance is minimum, thereby in theory infinitely-great electric current will appear, the impact of this electric current will damage the bonding conductor in rectifier bridge and loop very soon, perhaps with AC front end circuit breaker or air switch punching tripping operation, cause and can't normally power on, traditional solution is (can exchange input side in its rectifying and wave-filtering loop, also can be in the dc bus side) seal in the buffer resistance of current limliting, make its slow charging, after capacitance voltage is charged to substantially near the rectification crest voltage, with lower pressure reduction, by and in ohmically contactor or this resistance of relay short circuit, complete safe startup power up.
Although prior art can realize safe startup, along with the increase of plant capacity, this starting resistance is also corresponding will reduce resistance and increasing power, resistance is that the mode of loss heating is worked, will waste part energy, increase excess loss, reduce system effectiveness; And the heating problem that resistance produces is difficult to solution, and parameter designing and heat radiation assembling also may cause near the roasting bad device of high temperature and cause the risk of fire when unreasonable.
Summary of the invention
The object of the present invention is to provide a kind of current rectifying and wave filtering circuit and starting method thereof, with the electric energy loss that reduces current rectifying and wave filtering circuit and the fail safe that improves current rectifying and wave filtering circuit.
For achieving the above object, the present invention is by the following technical solutions: a kind of current rectifying and wave filtering circuit, comprise rectification circuit and capacitance group, this current rectifying and wave filtering circuit also comprises reactor L1, diode D1 and switch transistor T 1, diode D1 is parallel to the output of rectification circuit, be connected in series switch transistor T 1 between the output of rectification circuit and diode D1, reactor L1 is series between the positive pole of the negative electrode of diode D1 and capacitance group, the negative pole of the anodic bonding capacitance group of diode D1.
Further, switch transistor T 1 is the IGBT pipe, and the drain electrode of switch transistor T 1 connects the anode of diode D1, and the source electrode of switch transistor T 1 connects the negative pole of output end of rectification circuit.
Further, parallel contactor between the source electrode of switch transistor T 1 and drain electrode.
The invention also discloses a kind of starting method of current rectifying and wave filtering circuit, this current rectifying and wave filtering circuit is above-described current rectifying and wave filtering circuit, and this starting method comprises the following steps:
S1, the grid loading cycle pulse signal of switch transistor T 1, switch transistor T 1 is controlled rectification circuit capacitance group is carried out the charging of periodicity clearance-type.
Further, step S1 comprises the following steps:
S11, switch transistor T 1 is connected, and rectification circuit slowly charges to capacitance group by reactor L1, and its charging current increases gradually, and the voltage of capacitance group raises gradually;
S12, switch transistor T 1 disconnects, and reactor L1 slowly charges to capacitance group, and its charging current reduces gradually, and the voltage of capacitance group raises gradually;
S13, repeating step S11 and step S12, until the voltage of capacitance group is close to Output Voltage in Rectified Circuits, the charge cycle of capacitance group finishes.
Further, further comprising the steps of after step S1:
S2, switch transistor T 1 keeps connecting.
The present invention's beneficial effect compared with prior art is:
(1) current rectifying and wave filtering circuit of the present invention removes starting resistance, replace with reactor L1, diode D1 and switch transistor T 1, the gate pole load pulses signal of switch transistor T 1, by rectification circuit and reactor L1, capacitance group is carried out the charging of periodicity clearance-type, after a plurality of periodicity chargings, after capacitance group voltage approaches the voltage of exporting with rectification circuit, charging process finishes, switch transistor T 1 is directly opened and is got final product for a long time, the electric energy loss of circuit start process is lower, caloric value is few, and fail safe is improved.
(2) current rectifying and wave filtering circuit of the present invention parallel contactor between the grid of switch transistor T 1 and source electrode, purpose is can connect contactor with short switch pipe T1 after charging process finishes, and allows electric current pass through contactor, plays the effect of protection switch pipe T1.
(3) starting method of current rectifying and wave filtering circuit of the present invention adopts the periodically alternative starting resistance of clearance-type charging slowly to charge, and has avoided the electric energy loss of starting resistance, and whole charging process caloric value is few, safe, is fit to the startup of high-power circuit.
Description of drawings
Fig. 1 is the circuit diagram of current rectifying and wave filtering circuit embodiment of the present invention
Fig. 2 is the flow chart of the starting method of current rectifying and wave filtering circuit of the present invention
Embodiment
, in order to more fully understand technology contents of the present invention, below in conjunction with specific embodiment, technical scheme of the present invention is described further and illustrates.
The physical circuit figure of current rectifying and wave filtering circuit embodiment of the present invention as shown in Figure 1.The current rectifying and wave filtering circuit of the present embodiment comprises rectification circuit 10 and capacitance group 20.This current rectifying and wave filtering circuit also comprises reactor L1, diode D1 and switch transistor T 1.Diode D1 is parallel to the output of rectification circuit 10, be connected in series switch transistor T 1 between the output of rectification circuit 10 and diode D1, reactor L1 is series between the positive pole of the negative electrode of diode D1 and capacitance group 20, the negative pole of the anodic bonding capacitance group 20 of diode D1.Switch transistor T 1 is the IGBT pipe, and the drain electrode of switch transistor T 1 connects the anode of diode D1, and the source electrode of switch transistor T 1 connects the negative pole of output end of rectification circuit 10.The gate pole load pulses signal of switch transistor T 1, by reactor L1, capacitance group 20 is carried out periodic slowly charging, after a plurality of periodicity chargings, after capacitance group 20 voltages approach the voltage of exporting with rectification circuit 10, charging process finishes, and switch transistor T 1 is directly opened and got final product for a long time, and the electric energy loss of circuit start process is lower, caloric value is few, and fail safe is improved.
In other embodiments, parallel contactor between the source electrode of switch transistor T 1 and drain electrode.The purpose of contactor is can connect contactor with short switch pipe T1 after charging process finishes, and allows electric current pass through contactor, plays the effect of protection switch pipe T1.
The job step of the current rectifying and wave filtering circuit of the present embodiment is as follows:
1) powered on for the first time just at the beginning, because voltage on capacitance group 20 is zero, can equivalence think that capacitance group 20 is to be in short-circuit condition this moment, but because the gate pole of switch transistor T 1 does not load high level signal, switch transistor T 1 is in off state, and high pressure puts on switch transistor T 1, but does not have electric current to pass through;
2) give burst pulse high level signal of gate pole of switch transistor T 1, switch transistor T 1 is open-minded, be under zero initial condition at voltage on capacitance group 20, dc high voltage all puts on reactor L1, because of the suppression characteristic of reactor L1 self to electric current, charging current will be started from scratch, and the slope that determines by the inductance value size progressively increases; The current charges path that this stage produces is: the positive pole of rectification circuit 10 outputs charges to capacitance group 20 is anodal through reactor L1, then by capacitance group 20 negative poles, turns back to the negative pole of rectification circuit 10 via switch transistor T 1.In this process, diode D1 ends owing to being in reverse withstand voltage state always, does not have electric current to pass through, and this rises to along with charging current in the process of peak value, and capacitance group 20 progressively is recharged, and capacitance group 20 both end voltage progressively raise;
3) transfer low level signal to after switch transistor T 1 gate pole loads the burst pulse high level signal, switch transistor T 1 is turn-offed, at this moment, inductance characteristic due to reactor L1, electric current can not reduce suddenly, reactor L1 produces the reverse induction electromotive force, drive current continues to capacitance group 20 chargings, the diode D1 this moment of conducting due to loop current, induced current is carried out afterflow, electric current will charge by 20 positive poles from reactor L1 to capacitance group this moment, turn back to reactor L1 by capacitance group 20 negative poles through diode D1 again, form complete freewheel current charge circuit, in this process, electric current is decreased to zero gradually,
4) above step 1 to step 3 is completed the minor cycle of a charging, after postponing certain hour, circuit will again repeat above-mentioned steps 1 to 3 step capacitance group 20 will be carried out the 2nd second periodicity clearance-type charging, and repeat to n cycle always, after making capacitance group 20 voltages be charged to the voltage of exporting near rectification, the clearance-type charging process finishes, switch transistor T 1 will be directly open-minded for a long time, if the operating current of load 30 is less than the withstand long term exposure value of switch transistor T 1, as long as after charging is completed, directly the gate pole of switch transistor T 1 is set high level for a long time opens the work of getting final product; If the operating current of load 30 is larger, for avoiding switch transistor T 1 overcurrent damage, can be on switch transistor T 1 contactor in parallel again, directly connect contactor with short switch pipe T1 after the clearance-type charging process is completed, allow the large electric current of normal operation pass through from bypass contactor.
The starting method of current rectifying and wave filtering circuit of the present invention, as shown in Figure 2, this current rectifying and wave filtering circuit is above-described current rectifying and wave filtering circuit, this starting method comprises the following steps:
S1, the grid loading cycle pulse signal of switch transistor T 1, switch transistor T 1 is controlled 10 pairs of capacitance group of rectification circuit 20 and is carried out the charging of periodicity clearance-type.
Step S1 comprises the following steps:
Step S11, switch transistor T 1 is connected, and rectification circuit 10 slowly charges to capacitance group 20 by reactor L1, and its charging current increases gradually, and the voltage of capacitance group 20 raises gradually;
Step S12, switch transistor T 1 disconnects, and reactor L1 slowly charges to capacitance group 20, and its charging current reduces gradually, and the voltage of capacitance group 20 raises gradually;
Step S13, repeating step S11 and step S12, until the voltage of capacitance group 20 is close to rectification circuit 10 output voltages, the charge cycle of capacitance group 20 finishes.
Further comprising the steps of after step S1:
Step S2, switch transistor T 1 keeps connecting.
Above statement only further illustrates technology contents of the present invention with embodiment, so that the reader is easier to understand, but does not represent that embodiments of the present invention only limit to this, and any technology of doing according to the present invention is extended or recreation, all is subjected to protection of the present invention.
Claims (6)
1. current rectifying and wave filtering circuit, comprise rectification circuit and capacitance group, it is characterized in that, also comprise reactor L1, diode D1 and switch transistor T 1, described diode D1 is parallel to the output of rectification circuit, be connected in series switch transistor T 1 between the output of described rectification circuit and diode D1, described reactor L1 is series between the positive pole of the negative electrode of diode D1 and capacitance group, the negative pole of the anodic bonding capacitance group of described diode D1.
2. current rectifying and wave filtering circuit as claimed in claim 1, is characterized in that, described switch transistor T 1 is the IGBT pipe, and the drain electrode of described switch transistor T 1 connects the anode of diode D1, and the source electrode of described switch transistor T 1 connects the negative pole of output end of rectification circuit.
3. current rectifying and wave filtering circuit as claimed in claim 1 or 2, is characterized in that, parallel contactor between the source electrode of described switch transistor T 1 and drain electrode.
4. the starting method of a current rectifying and wave filtering circuit, this current rectifying and wave filtering circuit is current rectifying and wave filtering circuit claimed in claim 1, described starting method is characterised in that, comprises the following steps:
S1, the grid loading cycle pulse signal of described switch transistor T 1, described switch transistor T 1 is controlled rectification circuit capacitance group is carried out the charging of periodicity clearance-type.
5. the starting method of current rectifying and wave filtering circuit as claimed in claim 4, is characterized in that, described step S1 comprises the following steps:
S11, described switch transistor T 1 is connected, and described rectification circuit slowly charges to capacitance group by reactor L1, and its charging current increases gradually, and the voltage of described capacitance group raises gradually;
S12, described switch transistor T 1 disconnects, and described reactor L1 slowly charges to capacitance group, and its charging current reduces gradually, and the voltage of described capacitance group raises gradually;
S13, repeating step S11 and step S12, until the voltage of capacitance group is close to Output Voltage in Rectified Circuits, the charge cycle of described capacitance group finishes.
6. the starting method of current rectifying and wave filtering circuit as claimed in claim 4, is characterized in that, and is further comprising the steps of after described step S1:
S2, described switch transistor T 1 keeps connecting.
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| CN201310317346XA CN103401441A (en) | 2013-07-25 | 2013-07-25 | Rectification filter circuit and starting method thereof |
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| CN201310317346XA CN103401441A (en) | 2013-07-25 | 2013-07-25 | Rectification filter circuit and starting method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113793461A (en) * | 2021-09-16 | 2021-12-14 | 中磊电子（苏州）有限公司 | Video doorbell and automatic setting method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1428911A (en) * | 2001-12-27 | 2003-07-09 | 深圳市中兴通讯股份有限公司上海第二研究所 | Slowly-starting circuit of power factor correction circuit and its control device |
| CN102412717A (en) * | 2011-11-18 | 2012-04-11 | 广州三晶电气有限公司 | Lossless soft start device and method for frequency converter |
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2013
- 2013-07-25 CN CN201310317346XA patent/CN103401441A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1428911A (en) * | 2001-12-27 | 2003-07-09 | 深圳市中兴通讯股份有限公司上海第二研究所 | Slowly-starting circuit of power factor correction circuit and its control device |
| CN102412717A (en) * | 2011-11-18 | 2012-04-11 | 广州三晶电气有限公司 | Lossless soft start device and method for frequency converter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113793461A (en) * | 2021-09-16 | 2021-12-14 | 中磊电子（苏州）有限公司 | Video doorbell and automatic setting method thereof |
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Address after: 5, 4, 6 building, Pingshan private technology park, Taoyuan street, Nanshan District, Shenzhen, Guangdong 518000, China Applicant after: SHENZHEN ENC ELECTRICAL TECHNOLOGY CO., LTD. Address before: 5, 4, 6 building, Pingshan private technology park, Taoyuan street, Nanshan District, Shenzhen, Guangdong 518000, China Applicant before: Shenzhen Encom Electric Technologies Co., Ltd. |
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Application publication date: 20131120 |