CN205029345U - Low voltage compensation circuit - Google Patents
Low voltage compensation circuit Download PDFInfo
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- CN205029345U CN205029345U CN201520544657.4U CN201520544657U CN205029345U CN 205029345 U CN205029345 U CN 205029345U CN 201520544657 U CN201520544657 U CN 201520544657U CN 205029345 U CN205029345 U CN 205029345U
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Abstract
The utility model discloses a low voltage compensation circuit for solve among the prior art that stabiliser weight is big, bulky, inefficiency, technical problem with high costs, low voltage compensation circuit includes: connect switch module (1) and inductance (L) between voltage input end (Lin) and central line (N), when electric wire netting input voltage was low, voltage input end (Lin), inductance (L), switch module (1) and central line (N) formed the current loop to make inductance (L) stored energy, establish ties and hold voltage conversion sub circuit (2) between (Lout) in inductance (L) and voltage output, be used for during the current loop disconnection, the energy conversion of saving inductance (L) is the offset voltage to on superposeing electric wire netting input voltage, the low -voltage of importing the electric wire netting compensates, and generates stable output voltage, exports from voltage output end (Lout). Realized that the response is fast, efficient, small, light in weight, technological effect with low costs.
Description
Technical field
The utility model relates to electrical network output voltage compensation technical field, particularly relates to a kind of low-voltage compensating circuit.
Background technology
According to relevant regulations, power network line is required to be user's stable power-supplying, but, at city and country power network line end (i.e. power network line access user end), the deviation that voltage ubiquity is very large and voltage fluctuation is also very large, current main employing motor adjustable type, from lotus root voltage regulator, compensated voltage regulator or parameter voltage stabilizator, carries out voltage stabilizing to power network line output voltage, and these three kinds of voltage regulation ways all adopt heavy silicon steel sheet to do iron core.
Wherein, motor adjustable type utilizes electronic circuit to gather the height of electrical network output voltage from lotus root voltage regulator and compensated voltage regulator, and after the voltage collected and normal voltage being compared, drive motors drives brush to carry out ascending, descending pressure and regulates; Its advantage is that reliable operation, overload capacity are strong; Shortcoming is that reaction is slow, heavy, efficiency is low, cost is high and brush needs periodic maintenance.Parameter voltage stabilizator utilizes the saturation characteristic of magnetic core to carry out voltage stabilizing; Its advantage is reliable operation, overload capacity is strong, output short-circuit time can automatically protect, structure is simple, voltage stabilized range is large, antijamming capability is strong; Shortcoming is that weight is large, volume is large, price is high, noise is large, iron core temperature rise, high to input power operating frequency requirements.
Visible, although existing voltage regulation way has certain advantage, also at least exist: the technical problem that pressurizer weight is large, volume is large, efficiency is low, cost is high.
Utility model content
The embodiment of the present application is by providing a kind of low-voltage compensating circuit, solve in prior art the technical problem that pressurizer weight is large, volume is large, efficiency is low, cost is high, utilize the mode of circuit transformations, produce the voltage needing to compensate, the voltage inputted with electrical network superposes, the final burning voltage exporting needs, this low-voltage compensating circuit response fast (namely can transient compensation Voltage Drop), efficiency is high, volume is little, lightweight, with silicon replace copper iron and after high frequency cost lower than prior art.
The embodiment of the present application provides a kind of low-voltage compensating circuit, comprising:
Be connected to the switch module between the voltage input end of electrical network live wire and electrical network center line and energy storage inductor, described switch module and the series connection of described energy storage inductor; Wherein, when electrical network input voltage is low, described voltage input end, described energy storage inductor, described switch module and described electrical network center line form current circuit, to make described energy storage inductor stored energy;
Voltage transitions electronic circuit between the voltage output end being series at described energy storage inductor and described electrical network live wire, for when described current circuit disconnects, the power conversion stored by described energy storage inductor is bucking voltage; Wherein, described bucking voltage is added on the input voltage of described electrical network, compensates with the low-voltage inputted described electrical network, and generates stable output voltage, exports from described voltage output end.
Optionally, described switch module comprises:
To be connected between described voltage input end and described electrical network center line and the first switch member of series connection mutually and second switch part;
Wherein, described first switch member comprises the first parasitic body diode, and described second switch part comprises the second parasitic body diode; When the positive half cycle voltage of electrical network input voltage is low, described first switch member conducting, electric current inputs from described voltage input end, flows through described energy storage inductor, described first switch member of conducting and described second parasitic body diode successively, forms loop to described electrical network center line; When the negative half period voltage of electrical network input voltage is low, the conducting of described second switch part, electric current inputs from described electrical network center line, flows through the described second switch part of conducting, described first parasitic body diode and described energy storage inductor successively, forms loop to described voltage input end.
Optionally, described energy storage inductor comprises the first terminals and the second terminals, and described voltage transitions electronic circuit comprises:
The 3rd switch member that one end is connected with described first terminals and the 4th switch member, the first electric capacity that one end is connected with described second terminals and the second electric capacity; The other end of described 3rd switch member is connected with the other end of described first electric capacity, and is connected to described voltage output end; The other end of described 4th switch member is connected with the other end of described second electric capacity, and is connected to described voltage output end;
Wherein, described 3rd switch member comprises trixenie body diode, and described 4th switch member comprises the 4th parasitic body diode; When the positive half cycle voltage of electrical network input voltage is low, and during described current circuit disconnection, the energy that described energy storage inductor stores discharges to described first electric capacity by described trixenie body diode, to form positive half cycle bucking voltage at described first electric capacity two ends, described positive half cycle bucking voltage is added on the positive half cycle voltage of described electrical network input voltage, compensate with the positive half cycle low-voltage inputted described electrical network, and generate the positive half cycle output voltage of stable electrical network, by described voltage output end, the positive half cycle output voltage of described stable electrical network is exported simultaneously; And
When the negative half period voltage of electrical network input voltage is low, and during described current circuit disconnection, the energy that described energy storage inductor stores discharges to described second electric capacity by described 4th parasitic body diode, to form negative half period bucking voltage at described second electric capacity two ends, described negative half period bucking voltage is added on the negative half period voltage of described electrical network input voltage, compensate with the negative half period low-voltage inputted described electrical network, and generate stable electrical network negative half period output voltage, by described voltage output end, described stable electrical network negative half period output voltage is exported simultaneously.
Optionally, described low-voltage compensating circuit also comprises: be series at the short-circuit protection electronic circuit between described voltage transitions electronic circuit and described voltage output end.
Optionally, described short-circuit protection electronic circuit comprises:
Be series at the 5th switch member between the other end of described 3rd switch member and described voltage output end, for input positive half cycle voltage at electrical network and there is short circuit in power network line time disconnect, to carry out short-circuit protection to power network line;
Be series at the 6th switch member between the other end of described 4th switch member and described voltage output end, for disconnecting when electrical network inputs negative half period voltage and short circuit appears in power network line, to carry out short-circuit protection to power network line.
Optionally, the type of the switching device of described low-voltage compensating circuit employing is metal-oxide-semiconductor or IGBT.
The one or more technical schemes provided in the embodiment of the present application, at least have following technique effect or advantage:
Due in the embodiment of the present application, low-voltage compensating circuit comprises: be connected between the voltage input end of electrical network live wire and electrical network center line, and the switch module of series connection mutually and energy storage inductor; Voltage transitions electronic circuit between the voltage output end being series at described energy storage inductor and described electrical network live wire; Wherein, when electrical network input voltage is low, described voltage input end, described energy storage inductor, described switch module and described electrical network center line form current circuit, to make described energy storage inductor stored energy; When described current circuit disconnects, the power conversion that described energy storage inductor stores by described voltage transitions electronic circuit is bucking voltage; Described bucking voltage is added on the input voltage of described electrical network, compensates with the low-voltage inputted described electrical network, and generates stable output voltage, exports from described voltage output end.That is, by utilizing the mode of circuit transformations, produce the voltage needing to compensate when electrical network input voltage is low, the voltage inputted with electrical network superposes, the burning voltage that final output needs; Efficiently solve in prior art the technical problem that pressurizer weight is large, volume is large, efficiency is low, cost is high; This low-voltage compensating circuit response fast (namely can transient compensation Voltage Drop), efficiency is high, and volume is little, lightweight, replace copper iron with silicon and after high frequency cost lower than prior art.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiment of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
The first low-voltage compensating circuit structural representation that Fig. 1 provides for the embodiment of the present application;
The second low-voltage compensating circuit structural representation that Fig. 2 provides for the embodiment of the present application;
The employing metal-oxide-semiconductor that Fig. 3 provides for the embodiment of the present application is as the low-voltage compensating circuit schematic diagram of switching device;
The employing IGBT that Fig. 4 provides for the embodiment of the present application is as the low-voltage compensating circuit schematic diagram of switching device.
Embodiment
The embodiment of the present application is by providing a kind of low-voltage compensating circuit, solve in prior art the technical problem that pressurizer weight is large, volume is large, efficiency is low, cost is high, utilize the mode of circuit transformations, produce the voltage needing to compensate, the voltage inputted with electrical network superposes, the final burning voltage exporting needs, this low-voltage compensating circuit response fast (namely can transient compensation Voltage Drop), efficiency is high, volume is little, lightweight, with silicon replace copper iron and after high frequency cost lower than prior art.
The technical scheme of the embodiment of the present application is for solving the problems of the technologies described above, and general thought is as follows:
The embodiment of the present application provides a kind of low-voltage compensating circuit, comprising: be connected to the switch module between the voltage input end of electrical network live wire and electrical network center line and energy storage inductor, described switch module and the series connection of described energy storage inductor; Wherein, when electrical network input voltage is low, described voltage input end, described energy storage inductor, described switch module and described electrical network center line form current circuit, to make described energy storage inductor stored energy; Voltage transitions electronic circuit between the voltage output end being series at described energy storage inductor and described electrical network live wire, for when described current circuit disconnects, the power conversion stored by described energy storage inductor is bucking voltage; Wherein, described bucking voltage is added on the input voltage of described electrical network, compensates with the low-voltage inputted described electrical network, and generates stable output voltage, exports from described voltage output end.
Visible, in the embodiment of the present application, by utilizing the mode of circuit transformations, produce the voltage needing to compensate when electrical network input voltage is low, the voltage inputted with electrical network superposes, the burning voltage that final output needs; Efficiently solve in prior art the technical problem that pressurizer weight is large, volume is large, efficiency is low, cost is high; This low-voltage compensating circuit response fast (namely can transient compensation Voltage Drop), efficiency is high, and volume is little, lightweight, replace copper iron with silicon and after high frequency cost lower than prior art.
In order to better understand technique scheme, below in conjunction with Figure of description and concrete execution mode, technique scheme is described in detail, the specific features being to be understood that in the embodiment of the present application and embodiment is the detailed description to technical scheme, instead of the restriction to technical scheme, when not conflicting, the technical characteristic in the embodiment of the present application and embodiment can combine mutually.
First, please refer to Fig. 1, the embodiment of the present application provides a kind of low-voltage compensating circuit, comprising:
Be connected to the switch module 1 between the voltage input end Lin of electrical network live wire and electrical network center line N and energy storage inductor L, switch module 1 and energy storage inductor L connect; Wherein, when electrical network input voltage is low, voltage input end Lin, energy storage inductor L, switch module 1 and electrical network center line N form current circuit, to make energy storage inductor L stored energy;
Voltage transitions electronic circuit 2 between the voltage output end Lout being series at energy storage inductor L and electrical network live wire, for when described current circuit disconnects, the power conversion stored by energy storage inductor L is bucking voltage; Wherein, described bucking voltage is added on the input voltage of described electrical network, compensates with the low-voltage inputted described electrical network, and generates stable output voltage, exports from voltage output end Lout.
In specific implementation process, please refer to Fig. 2, switch module 1 comprises: to be connected between voltage input end Lin and electrical network center line N and the first switch member Q1 of series connection mutually and second switch part Q2; Wherein, the first switch member Q1 comprises the first parasitic body diode D1, and second switch part Q2 comprises the second parasitic body diode D2; When the positive half cycle voltage of electrical network input voltage is low, the first switch member Q1 conducting, electric current inputs from voltage input end Lin, flows through energy storage inductor L, the first switch member Q1 of conducting and the second parasitic body diode D2 successively, forms loop to electrical network center line N; When the negative half period voltage of electrical network input voltage is low, second switch part Q2 conducting, electric current inputs from electrical network center line N, flows through second switch part Q2, the first parasitic body diode D1 and the energy storage inductor L of conducting successively, forms loop to voltage input end Lin.
In specific implementation process, still please refer to Fig. 2, energy storage inductor L comprises the first terminals a and the second terminals b, and voltage transitions electronic circuit 2 comprises:
The 3rd switch member Q3 that one end is connected with the first terminals a and the 4th switch member Q4, the first electric capacity C1 that one end is connected with the second terminals b and the second electric capacity C2; The other end of the 3rd switch member Q3 is connected with the other end of the first electric capacity C1, and is connected to line voltage output Lout; The other end of the 4th switch member Q4 is connected with the other end of the second electric capacity C2, and is connected to line voltage output Lout;
Wherein, the 3rd switch member Q3 comprises trixenie body diode D3, and the 4th switch member Q4 comprises the 4th parasitic body diode D4; When the positive half cycle voltage of electrical network input voltage is low, and during described current circuit disconnection, the energy that energy storage inductor L stores discharges to the first electric capacity C1 by trixenie body diode D3, to form positive half cycle bucking voltage at the first electric capacity C1 two ends, described positive half cycle bucking voltage is added on the positive half cycle voltage of described electrical network input voltage, compensate with the positive half cycle low-voltage inputted described electrical network, and generate the positive half cycle output voltage of stable electrical network, by line voltage output Lout, the positive half cycle output voltage of described stable electrical network is exported simultaneously; And
When the negative half period voltage of electrical network input voltage is low, and during described current circuit disconnection, the energy that energy storage inductor L stores discharges to the second electric capacity C2 by the 4th parasitic body diode D4, to form negative half period bucking voltage at the second electric capacity C2 two ends, described negative half period bucking voltage is added on the negative half period voltage of described electrical network input voltage, compensate with the negative half period low-voltage inputted described electrical network, and generate stable electrical network negative half period output voltage, by line voltage output Lout, described stable electrical network negative half period output voltage is exported simultaneously.
Further, still please refer to Fig. 2, described low-voltage compensating circuit also comprises: be series at the short-circuit protection electronic circuit 3 between voltage transitions electronic circuit 2 and line voltage output Lout.Concrete, short-circuit protection electronic circuit 3 comprises: be series at the 5th switch member Q5 (comprising the 5th parasitic body diode D5) between the other end of the 3rd switch member Q3 and line voltage output Lout, for input positive half cycle voltage at electrical network and there is short circuit in power network line time disconnect, to carry out short-circuit protection to power network line;
Be series at the 6th switch member Q6 (comprising the 6th parasitic body diode D6) between the other end of the 4th switch member Q4 and line voltage output Lout; for disconnecting when electrical network inputs negative half period voltage and short circuit appears in power network line, to carry out short-circuit protection to power network line.
Wherein, first to the 6th switch member (Q1 ~ Q6) is all connected with external drive circuit (not shown); this external drive circuit to first to the 6th switch member (Q1 ~ Q6) sends control signal; to control being turned on or off of first to the 6th switch member (Q1 ~ Q6); and/or its duration that is turned on or off; low or when the negative half period voltage of electrical network input voltage is low to realize the above-mentioned positive half cycle voltage when electrical network input voltage; the low-voltage of electrical network input is compensated, and in whole voltage compensation procedure, short-circuit protection is carried out to power network line.
In specific implementation process, please refer to Fig. 3 or Fig. 4, switch module 1, voltage transitions electronic circuit 2 and short-circuit protection electronic circuit 3 comprise switching device, and described switching device is metal-oxide-semiconductor or IGBT:
Execution mode 1, the first to the 6th switch member (Q1 ~ Q6) is metal-oxide-semiconductor
Concrete, please refer to Fig. 3, the first to the 6th switch member (Q1 ~ Q6) is equal N-type metal-oxide-semiconductor, between the source of each metal-oxide-semiconductor, drain electrode, be connected with parasitic body diode.Voltage input end Lin is connected with the second terminals b of energy storage inductor L, the leakage of the first switch member Q1, source electrode is connected with the first terminals a of energy storage inductor L and the source electrode of second switch part Q2 respectively, the drain electrode of second switch part Q2 is connected with electrical network center line N, the first terminals a of the source electrode of the 3rd switch member Q3 and the drain electrode of the 4th switch member Q4 and energy storage inductor L, the drain electrode of the 3rd switch member Q3 is connected with one end of the first electric capacity C1 and the second electric capacity C2 respectively with the source electrode of the 4th switch member Q4, first electric capacity C1 is connected with the other end of the second electric capacity C2, the drain electrode of the 3rd switch member Q3 is also connected with the drain electrode of the 5th switch member Q5 and the source electrode of the 6th switch member Q6 respectively with the source electrode of the 4th switch member Q4, the source electrode of the 5th switch member Q5 is all connected with line voltage output Lout with the drain electrode of the 6th switch member Q6.In addition, the grid of the first to the 6th switch member (Q1 ~ Q6) all and external drive circuit, as impulse controller connects, not shown, this external pulse controller to first to the 6th switch member (Q1 ~ Q6) sends control impuls, to control being turned on or off of first to the 6th switch member (Q1 ~ Q6), and/or its duration that is turned on or off.
Execution mode 2, the first to the 6th switch member (Q1 ~ Q6) is insulated gate bipolar transistor IGBT (InsulatedGateBipolarTransistor)
Concrete, please refer to Fig. 4, the first to the 6th switch member (Q1 ~ Q6) is P type IGBT, between the emitter and collector of each IGBT, be connected with parasitic body diode.Voltage input end Lin is connected with the second terminals b of energy storage inductor L, the collector and emitter of the first switch member Q1 is connected with the first terminals a of energy storage inductor L and the emitter of second switch part Q2 respectively, the collector electrode of second switch part Q2 is connected with electrical network center line N, the first terminals a of the emitter of the 3rd switch member Q3 and the collector electrode of the 4th switch member Q4 and energy storage inductor L, the collector electrode of the 3rd switch member Q3 is connected with one end of the first electric capacity C1 and the second electric capacity C2 respectively with the emitter of the 4th switch member Q4, first electric capacity C1 is connected with the other end of the second electric capacity C2, the collector electrode of the 3rd switch member Q3 is also connected with the collector electrode of the 5th switch member Q5 and the emitter of the 6th switch member Q6 respectively with the emitter of the 4th switch member Q4, the emitter of the 5th switch member Q5 is all connected with line voltage output Lout with the collector electrode of the 6th switch member Q6.In addition, the grid of the first to the 6th switch member (Q1 ~ Q6) is all connected with external drive circuit (as impulse controller), not shown, this external pulse controller to first to the 6th switch member (Q1 ~ Q6) sends control impuls, to control being turned on or off of first to the 6th switch member (Q1 ~ Q6), and/or its duration that is turned on or off.
The circuit working principle of above-mentioned two kinds of execution modes is: when the positive half cycle voltage of electrical network input voltage is low, external drive circuit drives the first switch member Q1 open-minded, electric current is successively through the second parasitic body diode D2 of electrical network hot voltage input Lin, energy storage inductor L, the first switch member Q1 opened, second switch part Q2, form loop to electrical network center line N, energy storage is in inductance L; After of short duration ON time, external drive circuit drives the first switch member Q1 to disconnect, and in inductance L, energy discharges to electric capacity first electric capacity C1 through the trixenie body diode D3 of the 3rd switch member Q3.Wherein, controlled the service time of the first switch member Q1 by external drive circuit, just can control the size of the positive half cycle bucking voltage (Δ U1) that the first electric capacity C1 obtains, produce the positive half cycle bucking voltage needed; In addition, when electrical network inputs positive half cycle voltage, drive the 5th switch member Q5 to be in opening state by external drive circuit always, the voltage (Uin1) of electrical network live wire input input adds positive half cycle bucking voltage (Δ U1), just obtains stable positive half cycle output voltage (Uout1).
In like manner, low at the negative half period voltage of electrical network input voltage, external drive circuit drives second switch part Q2 open-minded, electric current is successively through electrical network center line N, second switch part Q2, the first parasitic body diode D1 of the first switch member Q1, the inductance L opened, form loop to electrical network live wire input Lin, energy storage is in inductance L; After of short duration ON time, external drive circuit drives second switch part Q2 to disconnect, and in inductance L, energy discharges to the second electric capacity C2 through the 4th parasitic body diode D4 of the 4th switch member Q4.Wherein, controlled the service time of second switch part Q2 by external drive circuit, just can control the size of the negative half period bucking voltage (Δ U2) that the second electric capacity C2 obtains, produce the negative half period bucking voltage needed; In addition, when electrical network input negative half period voltage, drive the 6th switch member Q6 to be in opening state by external drive circuit always, the voltage (Uin2) of input adds negative half period bucking voltage (Δ U2), just obtains stable negative half period output voltage (Uout2).
Certainly, in specific implementation process, in this programme low-voltage compensating circuit, included switching device also can be metal-oxide-semiconductor or the IGBT of other model, also can be turn-off thyristor GTO, integrated gate commutated thyristor IGCT etc., is not specifically limited here.Wherein, the alternating-current switch that the first switch member Q1 and second switch part Q2 is formed, also adds single tube by single-phase bridge and forms.
In sum, the technical essential adopted in this low-voltage compensating circuit comprises: 1) by the conducting of control switch device Q3/Q4, and energy storage inductor L stores and transfer energy, obtains the bucking voltage needed at electric capacity C1/C2 two ends.2) superpose bucking voltage by input voltage, obtain stable output voltage, by the size of control and compensation voltage, have adjusted the size of output voltage.3) open-minded by switching device Q1/Q2, energy storage inductor L stores and transfer energy, control on electric capacity C1/C2, obtain stable total busbar voltage, make total input current be the sinusoidal current synchronous with input voltage, thus reach the lifting of input power factor and the improvement of load harmonic current.
Further, by adopting this programme low-voltage compensating circuit, at least possess following advantage: 1) Circuit responce is fast, can transient compensation Voltage Drop; 2) efficiency is high, only has the conversion of Partial Power Δ U*I, only has single stage shift, and theoretical efficiency can be greater than 98%; 3) due to the existence of the first electric capacity C1 and the second electric capacity C2, can temporary transient storage power, by the lifting of control realization power factor; 4) there is short-circuit protection ability, when there is short circuit current, the 5th switch member Q5 or the 6th switch member Q6 can be turned off immediately, to reach the effect of instantaneous protection; 5) compensating circuit volume is little, lightweight, and replace copper iron with silicon, after high frequency, cost is lower than former technical scheme.
Although described preferred embodiment of the present utility model, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the utility model scope.
Obviously, those skilled in the art can carry out various change and modification to the utility model and not depart from spirit and scope of the present utility model.Like this, if these amendments of the present utility model and modification belong within the scope of the utility model claim and equivalent technologies thereof, then the utility model is also intended to comprise these change and modification.
Claims (6)
1. a low-voltage compensating circuit, is characterized in that, comprising:
Be connected to the switch module (1) between the voltage input end (Lin) of electrical network live wire and electrical network center line (N) and energy storage inductor (L), described switch module (1) and described energy storage inductor (L) series connection; Wherein, when electrical network input voltage is low, described voltage input end (Lin), described energy storage inductor (L), described switch module (1) and described electrical network center line (N) form current circuit, to make described energy storage inductor (L) stored energy;
Voltage transitions electronic circuit (2) between the voltage output end (Lout) being series at described energy storage inductor (L) and described electrical network live wire, for when described current circuit disconnects, be bucking voltage by the power conversion that described energy storage inductor (L) stores; Wherein, described bucking voltage is added on the input voltage of described electrical network, compensates with the low-voltage inputted described electrical network, and generates stable output voltage, exports from described voltage output end (Lout).
2. low-voltage compensating circuit as claimed in claim 1, it is characterized in that, described switch module (1) comprising:
To be connected between described voltage input end (Lin) and described electrical network center line (N) and first switch member (Q1) of series connection mutually and second switch part (Q2);
Wherein, described first switch member (Q1) comprises the first parasitic body diode (D1), and described second switch part (Q2) comprises the second parasitic body diode (D2); When the positive half cycle voltage of electrical network input voltage is low, the conducting of described first switch member (Q1), electric current inputs from described voltage input end (Lin), flow through described energy storage inductor (L), described first switch member (Q1) of conducting and described second parasitic body diode (D2) successively, form loop to described electrical network center line (N); When the negative half period voltage of electrical network input voltage is low, the conducting of described second switch part (Q2), electric current inputs from described electrical network center line (N), flow through the described second switch part (Q2) of conducting, described first parasitic body diode (D1) and described energy storage inductor (L) successively, form loop to described voltage input end (Lin).
3. low-voltage compensating circuit as claimed in claim 1, is characterized in that, described energy storage inductor (L) comprises the first terminals (a) and the second terminals (b), and described voltage transitions electronic circuit (2) comprising:
The 3rd switch member (Q3) that one end is connected with described first terminals (a) and the 4th switch member (Q4), the first electric capacity (C1) that one end is connected with described second terminals (b) and the second electric capacity (C2); The other end of described 3rd switch member (Q3) is connected with the other end of described first electric capacity (C1), and is connected to described voltage output end (Lout); The other end of described 4th switch member (Q4) is connected with the other end of described second electric capacity (C2), and is connected to described voltage output end (Lout);
Wherein, described 3rd switch member (Q3) comprises trixenie body diode (D3), and described 4th switch member (Q4) comprises the 4th parasitic body diode (D4), when the positive half cycle voltage of electrical network input voltage is low, and during described current circuit disconnection, the energy that described energy storage inductor (L) stores is discharged to described first electric capacity (C1) by described trixenie body diode (D3), to form positive half cycle bucking voltage at described first electric capacity (C1) two ends, described positive half cycle bucking voltage is added on the positive half cycle voltage of described electrical network input voltage, compensate with the positive half cycle low-voltage inputted described electrical network, and generate the positive half cycle output voltage of stable electrical network, by described voltage output end (Lout), the positive half cycle output voltage of described stable electrical network is exported simultaneously, and
When the negative half period voltage of electrical network input voltage is low, and during described current circuit disconnection, the energy that described energy storage inductor (L) stores is discharged to described second electric capacity (C2) by described 4th parasitic body diode (D4), to form negative half period bucking voltage at described second electric capacity (C2) two ends, described negative half period bucking voltage is added on the negative half period voltage of described electrical network input voltage, compensate with the negative half period low-voltage inputted described electrical network, and generate stable electrical network negative half period output voltage, by described voltage output end (Lout), described stable electrical network negative half period output voltage is exported simultaneously.
4. low-voltage compensating circuit as claimed in claim 3; it is characterized in that, described low-voltage compensating circuit also comprises: be series at the short-circuit protection electronic circuit (3) between described voltage transitions electronic circuit (2) and described voltage output end (Lout).
5. low-voltage compensating circuit as claimed in claim 4, it is characterized in that, described short-circuit protection electronic circuit (3) comprising:
Be series at the 5th switch member (Q5) between the other end of described 3rd switch member (Q3) and described voltage output end (Lout), for input positive half cycle voltage at electrical network and there is short circuit in power network line time disconnect, to carry out short-circuit protection to power network line;
Be series at the 6th switch member (Q6) between the other end of described 4th switch member (Q4) and described voltage output end (Lout); for disconnecting when electrical network inputs negative half period voltage and short circuit appears in power network line, to carry out short-circuit protection to power network line.
6. the low-voltage compensating circuit as described in claim as arbitrary in Claims 1 to 5, is characterized in that, the type of the switching device that described low-voltage compensating circuit adopts is metal-oxide-semiconductor or IGBT.
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| CN201520544657.4U CN205029345U (en) | 2015-07-24 | 2015-07-24 | Low voltage compensation circuit |
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| CN201520544657.4U CN205029345U (en) | 2015-07-24 | 2015-07-24 | Low voltage compensation circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108092279A (en) * | 2017-12-22 | 2018-05-29 | 国网山东省电力公司滨州供电公司 | A kind of device for comprehensively compensating reactive power harmonics of electric power system |
-
2015
- 2015-07-24 CN CN201520544657.4U patent/CN205029345U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108092279A (en) * | 2017-12-22 | 2018-05-29 | 国网山东省电力公司滨州供电公司 | A kind of device for comprehensively compensating reactive power harmonics of electric power system |
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