CN113646986A - Series capacitor voltage equalization circuit - Google Patents
Series capacitor voltage equalization circuit Download PDFInfo
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- CN113646986A CN113646986A CN202080025338.6A CN202080025338A CN113646986A CN 113646986 A CN113646986 A CN 113646986A CN 202080025338 A CN202080025338 A CN 202080025338A CN 113646986 A CN113646986 A CN 113646986A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 230000001939 inductive effect Effects 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000010409 thin film Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000003071 parasitic effect Effects 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/50—Charging of capacitors, supercapacitors, ultra-capacitors or double layer capacitors
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Abstract
The application discloses series capacitance voltage equalizer circuit includes: the circuit comprises a series capacitor circuit, an equalizing voltage circuit and a first equalizing circuit; a first node is arranged between the first capacitor and the second capacitor of the series capacitor circuit; the equalizing voltage circuit is used for providing equalizing voltage; the first equalizing circuit comprises a first equalizing resistor and a first triode; one end of the first equalizing resistor is connected with the collector of the first triode, the emitter of the first triode is connected with the first node, and the base of the first triode is connected with the equalizing voltage circuit. This application is through setting up first equalizing resistance and first triode for when the voltage at second electric capacity both ends and equalizing voltage's pressure differential are greater than the conduction pressure drop of first triode, charge to the second electric capacity through first equalizing resistance and first triode, so that the voltage value of the two of first electric capacity and second electric capacity reaches balanced state, so that the life-span of first electric capacity and second electric capacity reaches the state that equals basically, prolongs series capacitance's life-span from this.
Description
Technical Field
The application relates to the technical field of circuits, in particular to a series capacitor voltage equalization circuit.
Background
With the development of the times, the voltage value requirements of a plurality of devices on products are higher and higher, a plurality of power supply devices even need 800V or even higher voltage, and the withstand voltage value of a large-capacity electrolytic capacitor for filtering is usually only 450V, so that under the condition of facing higher voltage value requirements, a plurality of large-capacity electrolytic capacitors are required to be connected in series to meet the high voltage requirements.
The traditional series capacitor is usually directly connected in series or connected in parallel with a resistor at two ends of the capacitor, as shown in the traditional capacitor series using mode shown in fig. 1, C10 and C20 are capacitors used in series, R10 and R20 are resistors arranged in parallel with C10 and C20, and R20 is a resistorC10And RC20Parasitic resistances of C10 and C20, respectively. Ideally, the capacitance values and characteristics of the capacitor C10 and the capacitor C20 are identical to those of the parasitic resistor, and the resistances of the resistor R10 and the resistor R20 are also identical to each other. Thus, the voltage V1 is 1/2 VH +, and then each of C10 and C20 shares half of VH +. In fact, although C10 and C20 generally use the same type of capacitors with the same specification, due to process accuracy, parasitic parameters (parasitic resistance, inductance, etc.) and capacitance values of C10 and C20 may have deviations, which may cause different voltages shared across C10 and C20, and as VH + increases, the difference between the voltage across C10 and the voltage across C20 is more significant, which may cause one of C10 and C20 to be damaged by overvoltage. Therefore, the entire series capacitance is shortened, and the safety factor of the circuit using the series capacitance is low.
Disclosure of Invention
An object of this application is to provide a series capacitance voltage equalizer circuit, reduces the voltage difference at the respective both ends of series capacitance, promotes voltage balance nature, reduces the possibility that electric capacity overvoltage damaged to extension series capacitance's life increases the factor of safety that uses series capacitance's circuit.
The application provides a series capacitance voltage equalizer circuit includes: the circuit comprises a series capacitor circuit, an equalizing voltage circuit and a first equalizing circuit; the series capacitor circuit comprises a first capacitor and a second capacitor which are connected in series, and a first node is arranged between the first capacitor and the second capacitor; the equalizing voltage circuit is used for providing equalizing voltage; the first equalizing circuit comprises a first equalizing resistor and a first triode; one end of the first equalizing resistor is connected with the collector of the first triode, the emitter of the first triode is connected with the first node, and the base of the first triode is connected with the equalizing voltage circuit.
Optionally, the first equalizing circuit further includes: the second equalizing resistor and the second triode; one end of the second equalizing resistor is connected with the collector of the second triode, the emitter of the second triode is connected with the first node, and the base of the second triode is connected with the equalizing voltage circuit.
Optionally, the first triode Q1 is an NPN-type triode or an N-type MOS transistor; the second triode Q2 is a PNP triode or P-type MOS transistor.
Optionally, the voltage equalizing circuit includes a first resistor and a second resistor connected in series, and a second node is provided between the first resistor and the second resistor; and the base electrode of the first triode and the base electrode of the second triode are respectively connected with the second node.
Optionally, the first resistor and the second resistor are both any one of a carbon film resistor, a metal film resistor, a wire-wound resistor, a non-inductive resistor, or a thin film resistor.
Optionally, the series capacitor circuit is further connected in series with a third capacitor, and a third node is arranged between the second capacitor and the third capacitor; the series capacitor voltage equalization circuit further comprises a second equalization circuit, and the second equalization circuit comprises a third equalization resistor and a third triode; one end of the third equalizing resistor is connected with the collector of the third triode, the emitter of the third triode is connected with the third node, and the base of the third triode is connected with the equalizing voltage circuit.
Optionally, the second equalizing circuit further includes: a fourth equalizing resistor and a fourth triode; one end of the fourth equalizing resistor is connected with the collector of the fourth triode, the emitter of the fourth triode is connected with the third node, and the base of the fourth triode is connected with the equalizing voltage circuit.
Optionally, the voltage equalizing circuit is further connected in series with a third resistor, and a fourth node is arranged between the third resistor and the second resistor; and the base electrode of the third triode and the base electrode of the fourth triode are respectively connected with the fourth node.
Optionally, the first capacitor and the second capacitor are both electrolytic capacitors.
Optionally, the circuit further comprises a voltage source circuit, and the voltage source circuit is connected with one end of the first capacitor far away from the second capacitor.
The application provides a series capacitance voltage equalizer circuit includes: the circuit comprises a series capacitor circuit, an equalizing voltage circuit and a first equalizing circuit; the series capacitor circuit comprises a first capacitor and a second capacitor which are connected in series, and a first node is arranged between the first capacitor and the second capacitor; the equalizing voltage circuit is used for providing equalizing voltage; the first equalizing circuit comprises a first equalizing resistor and a first triode; one end of the first equalizing resistor is connected with the collector of the first triode, the emitter of the first triode is connected with the first node, and the base of the first triode is connected with the equalizing voltage circuit. Therefore, according to the voltage source circuit, the first equalizing resistor and the first triode are arranged, the voltage between the first capacitor and the second capacitor is unbalanced, and when the voltage difference between the voltage at the two ends of the second capacitor and the equalizing voltage is larger than the conduction voltage drop of the first triode, the voltage source circuit charges the second capacitor through the first equalizing resistor and the first triode so that the voltage values of the first capacitor and the second capacitor reach an equilibrium state. Therefore, the voltages born by the first capacitor and the second capacitor are equal, so that the service lives of the first capacitor and the second capacitor are basically equal, the possibility of overvoltage damage of the first capacitor is reduced, the service life of the series capacitor is prolonged, and the safety factor of a circuit using the series capacitor is increased.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application. Reference will now be made in brief to the accompanying drawings which are needed to describe the embodiments,
FIG. 1 is a diagram of an equalizing circuit in the prior art;
fig. 2 is a circuit diagram of a series capacitor voltage equalization circuit according to an embodiment of the present disclosure;
fig. 3 is a circuit diagram of a series capacitor voltage equalization circuit according to an embodiment of the present disclosure;
fig. 4 is a circuit diagram of a series capacitor voltage equalization circuit according to an embodiment of the present disclosure;
fig. 5 is a circuit diagram of a series capacitor voltage equalization circuit according to an embodiment of the present disclosure;
fig. 6 is a circuit diagram of a series capacitance voltage equalization circuit according to an embodiment of the present application.
Reference numerals:
10-series capacitance circuit, 20-equalizing voltage circuit, 30-first equalizing circuit, 40-second equalizing circuit and 50-voltage source circuit.
The implementation, functional features and advantages of the objectives of the present application will be further explained with reference to the accompanying drawings. Specific embodiments of the present application have been shown by way of example in the drawings and will be described in detail hereinafter.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope herein.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the recitation of an element by the phrase "comprising an … …" does not exclude the presence of additional like elements in the process, method, article, or apparatus that comprises the element, and further, where similarly-named elements, features, or elements in different embodiments of the disclosure may have the same meaning, or may have different meanings, that particular meaning should be determined by their interpretation in the embodiment or further by context with the embodiment.
Referring to fig. 2, an embodiment of the present application provides a series capacitor voltage equalization circuit, including: a series capacitance circuit 10, an equalizing voltage circuit 20, and a first equalizing circuit 30.
The series capacitor circuit 10 comprises a first capacitor C1 and a second capacitor C2 which are connected in series, and a first node n1 is arranged between the first capacitor C1 and the second capacitor C2; the equalizing voltage circuit 20 is used to provide an equalizing voltage. The first equalizing circuit 30 includes a first equalizing resistor RL1 and a first transistor Q1; one end of the first equalizing resistor RL1 is connected to the collector of the first transistor Q1, the emitter of the first transistor Q1 is connected to the first node n1, and the base of the first transistor Q1 is connected to the equalizing voltage circuit 20.
It should be understood by those skilled in the art that, in this embodiment, the type and capacitance of the first capacitor C1 and the second capacitor C2 are equal, so that the voltage loaded across the first capacitor C1 and the voltage loaded across the second capacitor C2 are equal, the service lives of the first capacitor C1 and the second capacitor C2 are substantially the same, and the probability that the life of the first capacitor C1 is shorter than that of the second capacitor C2 or the life of the second capacitor C2 is shorter than that of the first capacitor C1 is reduced, so as to prolong the life of the module using the series capacitance equalization circuit.
When the series capacitor voltage equalization circuit is used, a voltage source circuit 50 is provided, the voltage source circuit 50 is used for providing a voltage V, the voltage source circuit 50 and one end of the first capacitor C1 far away from the second capacitor C2 are connected, and the second capacitor C2 is far away from the ground end GND of one end of the first capacitor C1.
Then ideally the voltage V1 at the first node n1 should be equal to one half of the voltage V provided by the voltage source circuit 50, i.e. V1 is 0.5V. Therefore, the equalizing voltage V2 provided by the equalizing voltage circuit 20 is set to 0.5V, that is, V2 is 0.5V.
When the voltage V1 at the first node n1 is 0.5V, the voltage difference between the base and the emitter of the first transistor Q1 is 0, and the first transistor Q1 is in the off state. If the first capacitor C1 and the second capacitor C2 have a difference due to the difference in the process accuracy between the first capacitor C1 and the second capacitor C2, or due to the fact that the first capacitor C1 and the second capacitor C2 have been used for a certain period of time, the difference may be represented in terms of capacitance or impedance. The capacitance or impedance difference between the first capacitor C1 and the second capacitor C2 will cause the voltage V1 at the first node n1 to change, if the voltage V1 at the first node n1 is less than the voltage V2, that is: v2 is greater than V1, and if the voltage drop between V2 and V1 is greater than or equal to the conduction voltage drop V01 of the first triode Q1, namely V2-V1 is greater than or equal to V01, the first triode Q1 is conducted, at the moment, the voltage source circuit 50 charges the second capacitor C2 through the first equalizing resistor RL1 and the first triode Q1 until the voltage difference between V2 and V1 is smaller than the conduction voltage drop V01 of the first triode Q1, namely V2-V1 is smaller than V01, at the moment, the voltage values of the first capacitor C1 and the second capacitor C2 substantially reach an equilibrium state. The first equalizing resistor RL1 is a current limiting resistor.
As can be seen from the above, in the series capacitor voltage equalizing circuit provided in the embodiment of the present application, by providing the first equalizing resistor RL1 and the first transistor Q1, when the voltage between the first capacitor C1 and the second capacitor C2 is unbalanced, and the voltage difference between the voltage at the two ends of the second capacitor C2 and the equalizing voltage is greater than the conduction voltage drop of the first transistor Q1, the voltage source circuit 50 charges the second capacitor C2 through the first equalizing resistor RL1 and the first transistor Q1, so that the voltage values of the first capacitor C1 and the second capacitor C2 reach an equilibrium state. Therefore, the voltages borne by the first capacitor C1 and the second capacitor C2 are equal, the service lives of the first capacitor C1 and the second capacitor C2 are basically equal, the possibility that the first capacitor is damaged due to overvoltage is reduced, the service life of the series capacitor is prolonged, and the safety factor of a circuit using the series capacitor is increased.
In an alternative embodiment, as shown in fig. 3, the first equalizing circuit 30 further includes a second equalizing resistor RL2 and a second transistor Q2. One end of the second equalizing resistor RL2 is connected to the collector of the second transistor Q2, the emitter of the second transistor Q2 is connected to the first node n1, and the base of the second transistor Q2 is connected to the equalizing voltage circuit 20.
The capacitance or impedance difference between the first capacitor C1 and the second capacitor C2 will cause the voltage V1 at the first node n1 to change, if the voltage V1 at the first node n1 is less than the voltage V2, that is: v2 < V1, and if the voltage drop between V2 and V1 is greater than or equal to the conduction voltage drop V02 of the second triode Q2, namely V1-V2 is greater than or equal to V02, the second triode Q2 is conducted, the voltage V1 at the first node n1 is discharged through the second equalizing resistor RL2 and the second triode Q2 until the voltage difference between V2 and V1 is less than the conduction voltage drop V02 of the second triode Q2, namely V1-V2 < V02, and the voltage values of the first capacitor C1 and the second capacitor C2 reach an equilibrium state basically. The second equalizing resistance RL2 is a voltage dividing resistance.
As can be seen from the above, in the series capacitor voltage equalizing circuit provided in the embodiment of the present application, by providing the second equalizing resistor RL2 and the second transistor Q2, when the voltage between the first capacitor C1 and the second capacitor C2 is unbalanced, and the voltage difference between the voltage at the two ends of the second capacitor C2 and the equalizing voltage is greater than the conduction voltage drop of the first transistor Q1, the voltage V1 at the first node n1 is discharged through the second equalizing resistor RL2 and the second transistor Q2, so that the voltage values of the first capacitor C1 and the second capacitor C2 reach an equilibrium state. Therefore, the voltages borne by the first capacitor C1 and the second capacitor C2 are equal, so that the service lives of the first capacitor C1 and the second capacitor C2 reach a substantially equal state, and the service life of the series capacitor is prolonged.
In an alternative embodiment, the first transistor Q1 is an NPN transistor or an N MOS transistor; the second triode Q2 is a PNP triode or P-type MOS transistor.
In an alternative embodiment, as shown in fig. 4 and 5, the equalizing voltage circuit 20 includes a first resistor R1 and a second resistor R2 connected in series, and a second node n2 is provided between the first resistor R1 and the second resistor R2; the base of the first transistor Q1 and the base of the second transistor Q2 are connected to the second node n2, respectively.
Specifically, one end of the first resistor R1 of the equalizing voltage circuit 20, which is far from the second resistor R2, is connected to the voltage source circuit 50, that is, the voltage source circuit 50 is also used as a power source of the equalizing voltage circuit 20, thereby reducing the cost and saving the resources. The first resistor R1 and the second resistor R2 are equal in resistance and type, and the voltage at the second node n2 is half of the voltage V provided by the voltage source circuit 50, i.e., 0.5V, so that the voltage at the second node n2 is used as the equalizing voltage.
The first resistor R1 and the second resistor R2 are arranged, and the voltage at the second node n2 between the first resistor R1 and the second resistor R2 is used as the equalizing voltage V2, because the precision of the resistors is very high and can reach 1% or even 0.1%, and the resistor has a simple structure and is low in cost.
In an alternative embodiment, the first resistor R1 and the second resistor R2 are both any one of a carbon film resistor, a metal film resistor, a wire-wound resistor, a non-inductive resistor, or a thin film resistor. The selection can be specifically performed according to actual needs, and the embodiment of the application is not limited.
In an alternative embodiment, the first capacitor C1 and the second capacitor C2 may both be electrolytic capacitors. The reason for this is that, first, the electrolytic capacitor has a very large capacitance per unit volume, which is several tens to several hundreds times larger than other types of capacitors. Secondly, the rated capacity of the electrolytic capacitor is very large and can easily reach tens of thousands of muf or even a few f. Third, the electrolytic capacitor has a price advantage because the constituent materials of the electrolytic capacitor are common industrial materials such as aluminum and the like; the equipment for manufacturing the electrolytic capacitor is common industrial equipment, can be produced in large scale and has relatively low cost.
In an alternative embodiment, referring to fig. 6, the series capacitor circuit 10 is further connected in series with a third capacitor C3, and a third node n3 is disposed between the second capacitor C2 and the third capacitor C3. The series capacitor voltage equalization circuit further comprises a second equalization circuit 40, and the second equalization circuit 40 comprises a third equalization resistor RL3 and a third triode Q3; one end of the third equalizing resistor RL3 is connected to the collector of the third transistor Q3, the emitter of the third transistor Q3 is connected to the third node n3, and the base of the third transistor Q3 is connected to the equalizing voltage circuit 20.
In this embodiment, the series capacitor circuit 10 includes three capacitors, namely, the first capacitor C1, the second capacitor C2 and the third capacitor C3, so that ideally, the voltage V1 at the first node n1 and the voltage V3 at the third node n3 are both 1/3V, and thus the equalizing voltage circuit 20 is set to provide the equalizing voltage V2-1/3V.
When the voltage V1 at the first node n1 is 1/3V, the voltage difference between the base and the emitter of the first transistor Q1 is 0, and thus the first transistor Q1 is in the off state. If the capacitance or impedance of the first capacitor C1 and the second capacitor C2 is different, the voltage V1 at the first capacitor C1 and the first node n1 is smaller than the voltage V2, that is: v2 is greater than V1, and if the voltage drop between V2 and V1 is greater than or equal to the conduction voltage drop V0 of the first triode Q1, namely V2-V1 is greater than or equal to V0, the first triode Q1 is conducted, at the moment, the voltage source circuit 50 charges the second capacitor C2 through the first equalizing resistor RL1 and the first triode Q1 until the voltage difference between V2 and V1 is smaller than the conduction voltage drop V0 of the first triode Q1, namely V2-V1 is smaller than V0, at the moment, the voltage values of the first capacitor C1 and the second capacitor C2 substantially reach an equilibrium state.
When the voltage V3 at the third node n3 is 1/3V, the voltage difference between the base and the emitter of the third transistor Q3 is 0, and thus the third transistor Q3 is in the off state. If the capacitance or impedance of the second capacitor C2 and the third capacitor C3 are different, the voltage V3 at the third node n3 is smaller than the voltage V2, that is: v2 is greater than V3, and if the voltage drop between V2 and V3 is greater than or equal to the conduction voltage drop V03 of the third triode Q3, namely V2-V3 is greater than or equal to V0, the third triode Q3 is conducted, at the moment, the voltage source circuit 50 charges the third capacitor C3 through the third equalizing resistor RL3 and the third triode Q3 until the voltage difference between V2 and V3 is smaller than the conduction voltage drop V03 of the third triode Q3, namely V2-V1 is smaller than V03, at the moment, the voltage values of the second capacitor C2 and the third capacitor C3 substantially reach an equilibrium state.
As can be seen from the above, the first equalizing circuit 30 may equalize the voltages of the first capacitor C1 and the second capacitor C2, and the second equalizing circuit 40 may equalize the voltages of the second capacitor C2 and the third capacitor C3, and may finally reach a state where the voltages of the first capacitor C1, the second capacitor C2, and the third capacitor C3 are equalized. The series capacitor voltage circuit provided by the embodiment of the application is not only suitable for the situation that two capacitors are connected in series, but also suitable for the situation that three, four, say. The specific arrangement manner is the same as that of the first capacitor C1 to the third capacitor C3, and is not described again.
In an alternative embodiment, the second equalizing circuit 40 further includes a fourth equalizing resistor RL4 and a fourth transistor Q4. One end of the fourth equalizing resistor RL4 is connected to the collector of the fourth transistor Q4, the emitter of the fourth transistor Q4 is connected to the third node n3, and the base of the fourth transistor Q4 is connected to the equalizing voltage circuit 20.
As mentioned above, the series capacitor circuit 10 includes three capacitors, namely, the first capacitor C1, the second capacitor C2 and the third capacitor C3, and ideally, the voltage V1 at the first node n1 and the voltage V3 at the third node n3 are both 1/3V, so that the equalizing voltage circuit 20 is set to provide the equalizing voltage V2-1/3V.
In this case, when a difference occurs in the capacitance or impedance of the first capacitor C1 and the second capacitor C2, the voltage V1 at the first node n1 is smaller than the voltage V2, that is: v2 < V1, and if the voltage drop between V2 and V1 is greater than or equal to the conduction voltage drop V02 of the second triode Q2, namely V1-V2 is greater than or equal to V02, the second triode Q2 is conducted, the voltage V1 at the first node n1 is discharged through the second equalizing resistor RL2 and the second triode Q2 until the voltage difference between V2 and V1 is less than the conduction voltage drop V02 of the second triode Q2, namely V1-V2 < V02, and the voltage values of the first capacitor C1 and the second capacitor C2 reach an equilibrium state basically.
When a difference occurs in the capacitance or impedance of the second capacitor C2 and the third capacitor C3, the voltage V3 at the third node n3 is smaller than the voltage V2, that is: v2 < V3, and if the voltage drop between V2 and V3 is greater than or equal to the conduction voltage drop V04 of the fourth triode Q4, namely V3-V2 is greater than or equal to V04, the fourth triode Q4 is conducted, at the moment, the voltage V3 at the third node n3 is discharged through the fourth equalizing resistor RL4 and the fourth triode Q4 until the voltage difference between V2 and V3 is less than the conduction voltage drop V04 of the fourth triode Q4, namely V3-V2 < V04, at the moment, the voltage values of the second capacitor C2 and the third capacitor C3 reach an equilibrium state basically.
That is, the first equalizing circuit 30 may equalize the voltages of the first capacitor C1 and the second capacitor C2, and the second equalizing circuit 40 may equalize the voltages of the second capacitor C2 and the third capacitor C3, and may finally reach a state where the voltages of the first capacitor C1, the second capacitor C2, and the third capacitor C3 are all equalized.
In an alternative embodiment, the equalizing voltage circuit 20 is further connected in series with a third resistor R3, and a fourth node n4 is provided between the third resistor R3 and the second resistor R2; the base of the third transistor Q3 and the base of the fourth transistor Q4 are connected to the fourth node n4, respectively.
Specifically, it has been mentioned above that the equalizing voltage is 1/3V for the case where the series capacitance circuit 10 includes the first capacitance C1, the second capacitance C2, and the third capacitance C3. Then, the first resistor R1, the second resistor R2 and the third resistor R3 are arranged in series, and one end of the first resistor R1, which is far away from the second resistor R2, is connected to the voltage source circuit 50, and the third resistor R3 is connected to the ground terminal GND, so that the voltage at the second node n2 between the first resistor R1 and the second resistor R2 is 1/3V, and the voltage at the fourth node n4 between the second resistor R2 and the third resistor R3 is also 1/3V. Thus, the voltage at the second node n2 and the voltage at the fourth node n4 may be utilized as the equalizing voltage.
Of course, the third transistor Q3 is an NPN type transistor and the fourth transistor Q4 is a PNP type transistor, similar to the first equalizing circuit 30. The third equalizing resistor RL3 is a current limiting resistor, and the fourth equalizing resistor RL4 is a voltage dividing resistor.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A series capacitance voltage equalization circuit, comprising: the circuit comprises a series capacitor circuit, an equalizing voltage circuit and a first equalizing circuit;
the series capacitor circuit comprises a first capacitor and a second capacitor which are connected in series, and a first node is arranged between the first capacitor and the second capacitor; the equalizing voltage circuit is used for providing equalizing voltage;
the first equalizing circuit comprises a first equalizing resistor and a first triode; one end of the first equalizing resistor is connected with a collector of the first triode, an emitter of the first triode is connected with the first node, and a base of the first triode is connected with the equalizing voltage circuit.
2. The series capacitance voltage equalization circuit of claim 1, wherein the first equalization circuit further comprises: the second equalizing resistor and the second triode;
one end of the second equalizing resistor is connected with the collector of the second triode, the emitter of the second triode is connected with the first node, and the base of the second triode is connected with the equalizing voltage circuit.
3. The series capacitance-voltage equalization circuit of claim 2, wherein the first transistor is an NPN transistor or an N MOS transistor, and the second transistor is a PNP transistor or a P MOS transistor.
4. The series capacitance voltage equalization circuit of claim 2 wherein the equalization voltage circuit comprises a first resistor and a second resistor connected in series with a second node disposed therebetween; and the base electrode of the first triode and the base electrode of the second triode are respectively connected with the second node.
5. The series capacitance voltage equalization circuit of claim 4, wherein the first resistor and the second resistor are each any one of a carbon film resistor, a metal film resistor, a wire wound resistor, a non-inductive resistor, or a thin film resistor.
6. The series capacitance-voltage equalizing circuit of claim 4, wherein a third capacitor is further connected in series with the series capacitance circuit, and a third node is provided between the second capacitor and the third capacitor;
the series capacitor voltage equalization circuit further comprises a second equalization circuit, and the second equalization circuit comprises a third equalization resistor and a third triode; one end of the third equalizing resistor is connected with the collector of the third triode, the emitter of the third triode is connected with the third node, and the base of the third triode is connected with the equalizing voltage circuit.
7. The series capacitance voltage equalization circuit of claim 6, wherein the second equalization circuit further comprises: a fourth equalizing resistor and a fourth triode;
one end of the fourth equalizing resistor is connected with the collector of the fourth triode, the emitter of the fourth triode is connected with the third node, and the base of the fourth triode is connected with the equalizing voltage circuit.
8. The series capacitance voltage equalization circuit of claim 7 wherein the equalization voltage circuit is further connected in series with a third resistor, and a fourth node is provided between the third resistor and the second resistor; and the base electrode of the third triode and the base electrode of the fourth triode are respectively connected with the fourth node.
9. The series capacitance voltage equalization circuit of any of claims 1-8, wherein the first capacitance and the second capacitance are both electrolytic capacitances.
10. The series capacitance voltage equalization circuit of any of claims 1-8 further comprising a voltage source circuit connected to an end of the first capacitance distal from the second capacitance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2020/142431 WO2022141532A1 (en) | 2020-12-31 | 2020-12-31 | Series capacitor voltage equalization circuit |
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| CN113646986A true CN113646986A (en) | 2021-11-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080025338.6A Pending CN113646986A (en) | 2020-12-31 | 2020-12-31 | Series capacitor voltage equalization circuit |
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| CN (1) | CN113646986A (en) |
| WO (1) | WO2022141532A1 (en) |
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| CN115912899B (en) * | 2023-02-20 | 2023-05-23 | 广东东菱电源科技有限公司 | Capacitor series voltage dividing circuit |
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| CN203761266U (en) * | 2014-03-22 | 2014-08-06 | 深圳市德兰明海科技有限公司 | Dynamic voltage balancing circuit based on series connected capacitors |
| CN204030954U (en) * | 2014-08-26 | 2014-12-17 | 中国电子科技集团公司第四十一研究所 | A kind of series capacitance voltage dynamic balance circuit |
| CN111301226A (en) * | 2020-03-31 | 2020-06-19 | 西安工业大学 | Active balancing device and method for power battery of electric automobile |
| CN112104021A (en) * | 2020-08-28 | 2020-12-18 | 苏州腾冉电气设备股份有限公司 | Monomer voltage balance control system and method for super-capacitor energy storage system |
| CN214314625U (en) * | 2020-12-31 | 2021-09-28 | 深圳欣锐科技股份有限公司 | Series capacitor voltage equalization circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510114B (en) * | 2011-11-13 | 2014-04-23 | 东华大学 | Four-end type capacitor node voltage balancing module |
| CN103337955A (en) * | 2013-07-01 | 2013-10-02 | 浙江省能源与核技术应用研究院 | Low-loss series capacitance voltage-sharing device |
| CN206992934U (en) * | 2017-06-26 | 2018-02-09 | 杭州奥能电源设备有限公司 | More electric capacity series average-voltage circuits |
-
2020
- 2020-12-31 CN CN202080025338.6A patent/CN113646986A/en active Pending
- 2020-12-31 WO PCT/CN2020/142431 patent/WO2022141532A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203761266U (en) * | 2014-03-22 | 2014-08-06 | 深圳市德兰明海科技有限公司 | Dynamic voltage balancing circuit based on series connected capacitors |
| CN204030954U (en) * | 2014-08-26 | 2014-12-17 | 中国电子科技集团公司第四十一研究所 | A kind of series capacitance voltage dynamic balance circuit |
| CN111301226A (en) * | 2020-03-31 | 2020-06-19 | 西安工业大学 | Active balancing device and method for power battery of electric automobile |
| CN112104021A (en) * | 2020-08-28 | 2020-12-18 | 苏州腾冉电气设备股份有限公司 | Monomer voltage balance control system and method for super-capacitor energy storage system |
| CN214314625U (en) * | 2020-12-31 | 2021-09-28 | 深圳欣锐科技股份有限公司 | Series capacitor voltage equalization circuit |
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| WO2022141532A1 (en) | 2022-07-07 |
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