CN216981536U - Capacitor module voltage equalization circuit and system thereof - Google Patents
Capacitor module voltage equalization circuit and system thereof Download PDFInfo
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- CN216981536U CN216981536U CN202122390314.5U CN202122390314U CN216981536U CN 216981536 U CN216981536 U CN 216981536U CN 202122390314 U CN202122390314 U CN 202122390314U CN 216981536 U CN216981536 U CN 216981536U
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Abstract
The embodiment of the utility model discloses a capacitor module voltage equalization circuit and a system thereof. The capacitor module voltage balancing circuit includes: a voltage divider circuit, a voltage detector and an equalization regulating circuit. The first input end of the voltage detector is connected with the output end of the voltage division circuit, and the second input end of the voltage detector is connected with the second pole of the single capacitor; the voltage detector is used for changing the working state of the voltage detector when the voltage division signal output by the output end of the voltage division circuit is acquired to be equal to the balance starting voltage, and outputting a balance control signal at the output end of the voltage detector. The control end of the balance regulating circuit is connected with the output end of the voltage detector; the balance adjusting circuit is used for changing the working state of the balance adjusting circuit according to the balance control signal and adjusting the voltage of the single capacitor to the target voltage, so that the single capacitor is prevented from being damaged due to overhigh voltage of the single capacitor, the better consistency of the voltage among the single capacitors of the capacitor module is ensured, and the good balance of the voltage of the capacitor module is realized.
Description
Technical Field
The embodiment of the utility model relates to the technical field of capacitance equalization, in particular to a capacitor module voltage equalization circuit and a system thereof.
Background
Farad capacitor is a novel energy storage device between traditional capacitor and secondary battery, has the high power characteristic of traditional capacitor and the high energy characteristic of battery concurrently, still has advantages such as high specific power, heavy current charge-discharge ability, long-life, ultra-low temperature characteristic, high reliability, green simultaneously. The working voltage of the farad capacitor monomer is generally not higher than 3V, so that a plurality of farad capacitor monomers need to be combined in series and parallel to form a capacitor module, and the requirements of an actual application system on the voltage and energy levels can be met.
When the capacitor module is charged, because the internal resistance, the quality and the like of each monomer capacitor are not completely the same, partial monomer capacitors are not full of easily, and other monomer capacitors are full of in advance to exceed the target voltage, that is, the monomer capacitors are easily damaged by overvoltage in the charging process, however, the existing capacitor equalization circuit has poor effect of equalizing the voltage of the capacitor module.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a capacitor module voltage balancing circuit and a system thereof, which are used for preventing a monomer capacitor from being damaged due to overhigh voltage of the monomer capacitor, ensuring better consistency of voltage among monomers of a capacitor module and realizing good balancing of the voltage of the capacitor module.
In a first aspect, an embodiment of the present invention provides a capacitor module voltage equalization circuit, where the capacitor module voltage equalization circuit includes:
a first input end of the voltage division circuit is connected with a first pole of the single capacitor, and a second input end of the voltage division circuit is connected with a second pole of the single capacitor; the voltage division circuit outputs a voltage division signal at the output end of the voltage division circuit according to the voltage of the single capacitor;
a first input end of the voltage detector is connected with the output end of the voltage division circuit, and a second input end of the voltage detector is connected with a second pole of the single capacitor; the voltage detector is used for changing the working state of the voltage detector when the divided voltage signal is equal to or greater than the balance starting voltage and outputting a balance control signal at the output end of the voltage detector;
a first input end of the balance adjusting circuit is connected with a first pole of the single capacitor, a second input end of the balance adjusting circuit is connected with a second pole of the single capacitor, and a control end of the balance adjusting circuit is connected with an output end of the voltage detector; the balance adjusting circuit is used for changing the working state of the balance adjusting circuit according to the balance control signal and adjusting the voltage of the single capacitor to a target voltage.
Optionally, the equalization adjusting circuit includes: a signal transmission unit and an equalization main loop;
the first input end of the signal transmission unit is connected with the first input end of the balance adjusting circuit, the second input end of the signal transmission unit is connected with the second input end of the balance adjusting circuit, and the third input end of the signal transmission unit is connected with the control end of the balance adjusting circuit; the signal transmission unit is used for outputting an equalization starting signal at the output end of the signal transmission unit according to the equalization control signal;
the first input end of the equalization main loop is connected with the first input end of the equalization adjusting circuit, the second input end of the equalization main loop is connected with the second input end of the equalization adjusting circuit, and the control end of the equalization main loop is connected with the output end of the signal transmission unit; the balance main loop is used for changing the working state of the balance main loop according to the balance starting signal and adjusting the voltage of the single capacitor to a target voltage.
Optionally, the equalizing main loop comprises: the energy-consuming resistor comprises a first switch unit and an energy-consuming resistor;
the control end of the first switch unit is connected with the control end of the balance main loop, the first end of the first switch unit is connected with the first input end of the balance main loop, the second end of the first switch unit is connected with the first end of the energy consumption resistor, and the second end of the energy consumption resistor is connected with the second input end of the balance main loop.
Optionally, the first switching unit comprises: a Darlington tube; the energy dissipation resistor comprises: a first resistor and a second resistor;
a control end of the Darlington tube is used as a control end of the first switch unit, a first end of the Darlington tube is used as a first end of the first switch unit, and a second end of the Darlington tube is used as a second end of the first switch unit;
the first end of the first resistor is connected with the first end of the energy consumption resistor, and the second end of the second resistor is connected with the second end of the energy consumption resistor; the second resistor is connected in parallel with the first resistor.
Optionally, the signal transmission unit includes: the circuit comprises a second switching unit, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor;
a first end of the second switch unit is connected with a second input end of the signal transmission unit, a control end of the second switch unit is connected with a third input end of the signal transmission unit, and a second end of the second switch unit is connected with a control end of the third switch unit;
a first end of the third switching unit is connected with a first input end of the signal transmission unit, and a second end of the third switching unit is connected with a first end of the third resistor;
The second end of the third resistor is connected with the output end of the signal transmission unit;
a first end of the fourth resistor is connected with a second end of the third resistor, and a second end of the fourth resistor is connected with a second input end of the signal transmission unit;
a first end of the fifth resistor is connected with a control end of the third switching unit, and a second end of the fifth resistor is connected with a first end of the sixth resistor;
and the second end of the sixth resistor is connected with the first end of the signal transmission unit.
Optionally, the alert circuit includes: a seventh resistor and a light-emitting reminding unit;
the first end of the seventh resistor is connected with the first end of the third resistor, the second end of the seventh resistor is connected with the first pole of the luminous reminding unit, and the second pole of the luminous reminding unit is connected with the second end of the fourth resistor.
Optionally, the method further comprises: a signal processing circuit;
the first input end of the signal processing circuit is connected with the first pole of the single capacitor, the second input end of the signal processing circuit is connected with the second pole of the single capacitor, the control end of the signal processing circuit is connected with the output end of the signal transmission unit, and the output end of the signal processing circuit is connected with an external control circuit; the signal processing circuit is used for changing the working state of the signal processing circuit according to the equalization starting signal and transmitting the equalization starting signal to the external control circuit.
Optionally, the signal processing circuit comprises: the fourth switch unit, the fifth switch unit, the eighth resistor, the ninth resistor, the tenth resistor, the eleventh resistor and the photoelectric coupling unit;
a first end of the eighth resistor is connected with the control end of the signal processing circuit, and a second end of the eighth resistor is connected with the control end of the fourth switching unit;
a first end of the fourth switching unit is connected with the second input end of the signal transmission unit, and a second end of the fourth switching unit is connected with a first end of the ninth resistor;
the second end of the ninth resistor is connected with the first end of the tenth resistor;
a second end of the tenth resistor is connected with the first input end of the signal transmission unit;
a control end of the fifth switch unit is connected with a first end of the tenth resistor, a first end of the fifth switch unit is connected with a first input end of the signal transmission unit, and a second end of the fifth switch unit is connected with a first end of the photoelectric coupling unit;
the second end of the photoelectric coupling unit is connected with the external control circuit, and the third end of the photoelectric coupling unit is connected with the first end of the eleventh resistor;
And the second end of the eleventh resistor is connected with the second input end of the signal transmission unit.
Optionally, the voltage divider circuit includes: a twelfth resistor, a thirteenth resistor and a voltage dividing capacitor;
a first end of the twelfth resistor is connected with a first input end of the voltage division circuit, and a second end of the twelfth resistor is connected with an output end of the voltage division circuit;
a first pole of the voltage division capacitor is connected with a second end of the twelfth resistor, and a second pole of the voltage division capacitor is connected with a second input end of the voltage division circuit;
and a first end of the thirteenth resistor is connected with the first pole of the voltage division capacitor, and a second end of the thirteenth resistor is connected with the second input end of the voltage division circuit.
In a second aspect, an embodiment of the present invention further provides a capacitor module voltage equalization system, where the capacitor module includes a plurality of individual capacitors, and the system includes a plurality of capacitor module voltage equalization circuits according to the first aspect;
the capacitor module voltage equalization circuits correspond to the single capacitors one by one;
the capacitor module voltage balancing circuit is connected with a first pole of the corresponding monomer capacitor through a first lead, and is connected with a second pole of the corresponding monomer capacitor through a second lead.
The embodiment of the utility model provides a capacitor module voltage balancing circuit and a system thereof, wherein a voltage dividing circuit, a voltage detector, a balancing regulating circuit and the connection relation thereof are arranged; make voltage detector can gather the partial pressure signal of accurate monomer electric capacity voltage from bleeder circuit, and change the operating condition of self when judging that partial pressure signal equals or is greater than balanced opening voltage, the operating condition of balanced control signal control balanced regulating circuit of output, so that balanced regulating circuit adjusts the voltage of monomer electric capacity to target voltage, with this prevent that monomer electric capacity voltage is too high and damage monomer electric capacity, and then guaranteed the better uniformity of capacitor module voltage between the monomer, the good equilibrium of capacitor module voltage has been realized.
Drawings
Fig. 1 is a schematic structural diagram of a voltage equalization circuit of a capacitor module according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another voltage equalization circuit for a capacitor module according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another voltage equalization circuit for a capacitor module according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another voltage equalization circuit for a capacitor module according to an embodiment of the present invention;
Fig. 5 is a schematic structural diagram of another voltage equalizing circuit of a capacitor module according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another voltage equalizing circuit of a capacitor module according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another voltage equalizing circuit of a capacitor module according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another voltage equalizing circuit of a capacitor module according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a voltage equalizing system of a capacitor module according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not to be construed as limiting the utility model. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of a voltage equalizing circuit of a capacitor module according to an embodiment of the present invention. Referring to fig. 1, the capacitor module voltage equalizing circuit 100 includes: a voltage divider circuit 10, a voltage detector 20 and an equalization adjustment circuit 30.
A first input end a1 of the voltage divider circuit 10 is connected with a first pole of the single capacitor, and a second input end a2 of the voltage divider circuit 10 is connected with a second pole of the single capacitor; the voltage divider circuit 10 outputs a divided voltage signal at an output terminal a3 of the voltage divider circuit 10 according to the voltage of the individual capacitor. A first input terminal VCC of the voltage detector 20 is connected to the output terminal a3 of the voltage divider circuit 10, and a second input terminal VSS of the voltage detector 20 is connected to the second pole of the single capacitor; the voltage detector 20 is configured to change its operating state when the divided voltage signal is equal to or greater than the equalization start voltage, and output an equalization control signal at an output terminal OUT of the voltage detector 20. The first input end d1 of the balance adjusting circuit 30 is connected with the first pole of the single capacitor, the second input end d2 of the balance adjusting circuit 30 is connected with the second pole of the single capacitor, and the control end d3 of the balance adjusting circuit 30 is connected with the output end OUT of the voltage detector 20; the equalization adjusting circuit 30 is configured to change its operating state according to the equalization control signal, and adjust the voltage of the cell capacitor to a target voltage.
Specifically, a first electrode of the cell capacitor is a positive electrode of the cell capacitor, and is indicated by "+" in fig. 1, and a second electrode of the cell capacitor is a negative electrode of the cell capacitor, and is indicated by "-" in fig. 1. The voltage divider circuit 10 can divide the voltage of the individual capacitor based on the connection relationship between the voltage divider circuit 10 and the individual capacitor.
The voltage detector 20 is a high-precision electronic component, and based on the connection relationship with the voltage divider circuit 10, the voltage detector 20 can acquire a precise voltage division signal of the cell capacitor voltage from the output end a3 of the voltage divider circuit 10. The operating state of the voltage detector 20 may include conducting and non-conducting. For example, when the divided voltage signal is not equal to or greater than the turn-on voltage, it indicates that the cell capacitor is not fully charged, and the target voltage is not reached, the voltage detector 20 is not turned on, so that the voltage at the output terminal OUT of the voltage detector 20 is equal to the voltage at the second input terminal VSS of the voltage detector 20, that is, equal to the voltage at the second pole of the cell capacitor, and the equalization control signal is not output; when the divided voltage signal is equal to or greater than the turn-on voltage, it indicates that the cell capacitor is charged in advance, and exceeds the target voltage, the voltage detector 20 is turned on, so that the voltage at the output terminal OUT of the voltage detector 20 is equal to the voltage at the first input terminal VCC of the voltage detector 20, and the output terminal OUT of the voltage detector 20 outputs the equalization control signal. Accordingly, the voltage detector 20 is arranged, so that an accurate voltage division signal of the voltage of the single capacitor can be acquired, whether the single capacitor is full can be accurately judged, the voltage of the single capacitor can be detected once the voltage is over-voltage, the single capacitor can be prevented from being damaged due to over-voltage of the single capacitor, and good balance of the voltage of the capacitor module can be realized.
The equalization adjustment circuit 30 has the function of consuming electric energy, and the operation state of the equalization adjustment circuit 30 may include conduction and non-conduction. Illustratively, when the voltage detector 20 does not send the equalization control signal to the equalization adjusting circuit 30, the equalization adjusting circuit 30 is not turned on, and the equalization adjusting circuit 30 does not consume the electric energy of the single capacitor, so that the single capacitor remains charged; when the equalizing circuit 100 receives the equalizing control signal sent by the voltage detector 20, the equalizing control circuit 30 is turned on, and the equalizing control circuit 30 consumes the electric energy of the single capacitor, so that the single capacitor starts to discharge until the voltage of the single capacitor is adjusted to the target voltage, and the voltage detector 20 does not send the equalizing control signal any more, so that the equalizing control circuit 30 switches from being turned on to being turned off, stops consuming the electric energy of the single capacitor, and keeps the voltage of the single capacitor at the target voltage basically.
Accordingly, the voltage divider circuit 10, the voltage detector 20, the balance adjusting circuit 30 and the connection relationship thereof are arranged in the embodiment of the present invention; make voltage detector 20 can gather the partial pressure signal of accurate monomer electric capacity voltage from bleeder circuit 10, and switch on when the partial pressure signal equals or is greater than balanced opening voltage, thereby switch on of balanced control signal control balanced regulating circuit 30 of output, so that make balanced regulating circuit 30 consume the electric energy of monomer electric capacity, thereby voltage control to the target voltage of monomer electric capacity, with this prevent monomer electric capacity voltage too high and damage monomer electric capacity, and then guaranteed the better uniformity of voltage between capacitor module monomer, the good equilibrium of capacitor module voltage has been realized.
Fig. 2 is a schematic structural diagram of another capacitor module voltage equalization circuit according to an embodiment of the present invention. Referring to fig. 2, in one embodiment of the present invention, the equalization adjustment circuit 30 includes: a signal transmission unit 31 and an equalization main loop 32.
The first input terminal e1 of the signal transmission unit 31 is connected with the first input terminal d1 of the equalization adjusting circuit 30, the second input terminal e2 of the signal transmission unit 31 is connected with the second input terminal d2 of the equalization adjusting circuit 30, and the third input terminal e3 of the signal transmission unit 31 is connected with the control terminal d3 of the equalization adjusting circuit 30; the signal transmission unit 31 is configured to output an equalization-enabled signal at an output e4 of the signal transmission unit 31 according to the equalization control signal. The first input terminal f1 of the main equalization loop 32 is connected to the first input terminal d1 of the equalization adjustment circuit 30, the second input terminal f2 of the main equalization loop 32 is connected to the second input terminal d2 of the equalization adjustment circuit 30, and the control terminal f3 of the main equalization loop 32 is connected to the output terminal e4 of the signal transmission unit 31; the equalization main circuit 32 is configured to change its operating state according to the equalization start signal, and adjust the voltage of the cell capacitor to a target voltage.
Specifically, the signal transmission unit 31 outputs the equalization-on signal according to the equalization control signal may be understood as transmitting the equalization control signal to the equalization main loop 32 step by step backward, that is, the signal transmission unit 31 plays a role of transmitting a signal. The equalization main circuit 32 may consume the power of the single capacitor after receiving the signal transmitted by the signal transmission unit 31. In the embodiment of the utility model, the balance adjusting circuit 30 is arranged into two parts, so that the signal transmission and the power consumption are formed by two independent parts, the functions are not interfered with each other, and the circuit has strong reliability. Wherein, the operation status of the equalizing main loop 32 may include conducting and non-conducting; for example, the equalizing main circuit 32 is not turned on when not receiving the equalizing start signal, so that it does not consume the electric energy of the individual capacitors, and is turned on when receiving the equalizing start signal, so that the electric energy of the individual capacitors is consumed, so that the voltage of the individual capacitors is adjusted to the target voltage, and the voltage among the individual capacitors of the capacitor module has better consistency.
Fig. 3 is a schematic structural diagram of another voltage equalizing circuit of a capacitor module according to an embodiment of the present invention. Referring to fig. 3, in one embodiment of the present invention, equalization main loop 32 includes: a first switching unit 321 and a dissipation resistor 322. The control end of the first switch unit 321 is connected to the control end f3 of the main equalizing loop 32, the first end of the first switch unit 321 is connected to the first input end f1 of the main equalizing loop 32, the second end of the first switch unit 321 is connected to the first end of the energy dissipation resistor 322, and the second end of the energy dissipation resistor 322 is connected to the second input end f2 of the main equalizing loop 32.
When the first switch unit 321 is turned on, the equalizing main circuit 32 is turned on, and when the first switch unit 321 is turned off, the equalizing main circuit 32 is turned off. According to the technical scheme of the embodiment of the utility model, only the first switch unit 321 is arranged to realize the switching of the state of the balanced main loop 32, and the circuit has the advantages of simple structure, easiness in realization and strong practicability. Meanwhile, the energy consumption resistor 322 is arranged to consume the electric energy of the single capacitor, and the structure is simple and easy to set. The energy dissipation resistor 322 may be composed of a plurality of resistors connected in parallel and in series, which is not limited in particular.
With continued reference to fig. 3, in one embodiment of the present invention, the first switching unit 321 includes a darlington transistor, and the dissipation resistor 322 includes a first resistor R1 and a second resistor R2.
A control end of the darlington tube is used as a control end of the first switch unit 321, a first end of the darlington tube is used as a first end of the first switch unit 321 and is used as a first end of the first switch unit 321, and a second end of the darlington tube is used as a second end of the first switch unit 321. A first end of the first resistor R1 is connected to a first end of the dissipation resistor 322, and a second end of the second resistor R2 is connected to a second end of the dissipation resistor 322; the second resistor R2 is connected in parallel with the first resistor R1. The darlington tube can be composed of two NPN type triodes, and the resistance values of the first resistor R1 and the second resistor R2 can be set according to actual needs.
With continued reference to fig. 3, in one embodiment of the present invention, the signal transmission unit 31 includes: the circuit comprises a second switch unit, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6.
A first terminal of the second switching unit is connected to the second input terminal e2 of the signal transmission unit 31, a control terminal of the second switching unit is connected to the third input terminal e3 of the signal transmission unit 31, and a second terminal of the second switching unit is connected to the control terminal of the third switching unit. A first terminal of the third switching unit is connected to the first input terminal e1 of the signal transmission unit 31, and a second terminal of the third switching unit is connected to a first terminal of the third resistor R3. A second terminal of the third resistor R3 is connected to the output terminal e4 of the signal transmission unit 31. A first end of the fourth resistor R4 is connected to a second end of the third resistor R3, and a second end of the fourth resistor R4 is connected to the second input end e2 of the signal transmission unit 31. A first terminal of the fifth resistor R5 is connected to the control terminal of the third switching unit, and a second terminal of the fifth resistor R5 is connected to a first terminal of the sixth resistor R6. A second end of the sixth resistor R6 is connected to the first end of the signal transmission unit 31.
Illustratively, the second switching unit may include a first transistor Q1, the first transistor Q1 may be an NPN-type transistor, an emitter of the first transistor Q1 may serve as a first terminal of the second switching unit, a collector of the first transistor Q1 may serve as a second terminal of the second switching unit, and a base of the first transistor Q1 may serve as a control terminal of the second switching unit. The third switching unit may include a second transistor Q2, the second transistor Q2 may be a PNP type transistor, an emitter of the second transistor Q2 may serve as a first terminal of the third switching unit, a collector of the second transistor Q2 may serve as a second terminal of the third switching unit, and a base of the second transistor Q2 may serve as a control terminal of the third switching unit. The second switch unit is turned on after receiving the equalization control signal, the third switch unit is turned on, and finally the second end of the third resistor R3 outputs an equalization start signal.
Fig. 4 is a schematic structural diagram of another capacitor module voltage equalization circuit according to an embodiment of the present invention. Referring to fig. 4, in an embodiment of the present invention, the capacitor module voltage equalizing circuit 100 further includes a seventh resistor R7 and a light-emitting reminding unit 40. The first end of the seventh resistor R7 is connected to the first end of the third resistor R3, the second end of the seventh resistor R7 is connected to the first pole of the light-emitting alert unit 40, and the second pole of the light-emitting alert unit 40 is connected to the second end of the fourth resistor R4.
The light-emitting reminding unit 40 may include a light-emitting diode, and an anode of the light-emitting diode may be used as a first pole of the light-emitting reminding unit 40, and a cathode of the light-emitting diode may be used as a second pole of the light-emitting reminding unit 40. When the third switch unit is turned on, it indicates that the single capacitor is fully charged in advance, and exceeds the target voltage, at this time, the light-emitting reminding unit 40 is powered on to start emitting light, so as to remind the single capacitor of overvoltage in a light-emitting manner.
Fig. 5 is a schematic structural diagram of another voltage equalizing circuit for capacitor modules according to an embodiment of the present invention. Referring to fig. 5, in an embodiment of the present invention, the capacitor module voltage equalization circuit 100 further includes a signal processing circuit 50. A first input end g1 of the signal processing circuit 50 is connected with a first pole of the single capacitor, a second input end g2 of the signal processing circuit 50 is connected with a second pole of the single capacitor, a control end g3 of the signal processing circuit 50 is connected with an output end e4 of the signal transmission unit 31, and an output end g4 of the signal processing circuit 50 is connected with an external control circuit; the signal processing circuit 50 is configured to change an operating state thereof according to the equalization enable signal, and transmit the equalization enable signal to an external control circuit. Illustratively, when the signal processing circuit 50 receives the equalization on signal, the signal processing circuit 50 is turned on, so that the signal processing circuit 50 can transmit the equalization on signal to the external control circuit to realize the control of the external control circuit when the cell capacitor is over-voltage.
Fig. 6 is a schematic structural diagram of another voltage equalizing circuit of a capacitor module according to an embodiment of the present invention. Referring to fig. 6, in one embodiment of the present invention, a signal processing circuit 50 includes: the circuit comprises a fourth switching unit, a fifth switching unit, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11 and a photoelectric coupling unit S.
A first end of the eighth resistor R8 is connected to the control end g3 of the signal processing circuit 50, and a second end of the eighth resistor R8 is connected to the control end of the fourth switching unit. A first terminal of the fourth switching unit is connected to the second input terminal e2 of the signal transmission unit 31, and a second terminal of the fourth switching unit is connected to a first terminal of the ninth resistor R9. A second terminal of the ninth resistor R9 is connected to a first terminal of a tenth resistor R10. A second terminal of the tenth resistor R10 is connected to the first input terminal e1 of the signal transmission unit 31. The control end of the fifth switching unit is connected to the first end of the tenth resistor R10, the first end of the fifth switching unit is connected to the first input end e1 of the signal transmission unit 31, and the second end of the fifth switching unit is connected to the first end of the photocoupling unit S. The second end of the photoelectric coupling unit S is connected with an external control circuit, and the third end of the photoelectric coupling unit S is connected with the first end of the eleventh resistor R11. A second end of the eleventh resistor R11 is connected to the second input e2 of the signal transmission unit 31.
The photo-coupling unit S is, for example, a photo-coupler. The fourth switching unit may include a third transistor Q3, the third transistor Q3 may be an NPN type transistor, an emitter of the third transistor Q3 may serve as a first terminal of the fourth switching unit, a collector of the third transistor Q3 may serve as a second terminal of the fourth switching unit, and a base of the third transistor Q3 may serve as a control terminal of the fourth switching unit. The fifth switching unit may include a fourth transistor Q4, the fourth transistor Q4 may be a PNP type transistor, an emitter of the fourth transistor Q4 may serve as the first terminal of the fifth switching unit, a collector of the fourth transistor Q4 may serve as the second terminal of the fifth switching unit, and a base of the fourth transistor Q4 may serve as the control terminal of the fifth switching unit.
Fig. 7 is a schematic structural diagram of another voltage equalizing circuit for capacitor modules according to an embodiment of the present invention. Referring to fig. 7, in one embodiment of the present invention, a voltage dividing circuit 10 includes: a twelfth resistor R12, a thirteenth resistor R13 and a voltage dividing capacitor C0.
A first end of the twelfth resistor R12 is connected to the first input end a1 of the voltage divider 10, and a second end of the twelfth resistor R12 is connected to the output end a3 of the voltage divider 10. A first pole of the voltage-dividing capacitor is connected to the second end of the twelfth resistor R12, and a second pole of the voltage-dividing capacitor is connected to the second input terminal a2 of the voltage-dividing circuit 10. A first terminal of the thirteenth resistor R13 is connected to the first pole of the voltage dividing capacitor, and a second terminal of the thirteenth resistor R13 is connected to the second input terminal a2 of the voltage dividing circuit 10.
The following describes the working principle of the capacitor module voltage equalizing circuit 100 according to the embodiment of the present invention in detail, referring to fig. 7:
the first input VCC of the voltage detector 20 collects the voltage-dividing signal from the connection point between the twelfth resistor R12 and the thirteenth resistor R13 in real time. When the divided voltage signal is equal to or greater than the equalizing start voltage, it indicates that the cell capacitor is charged in advance, and exceeds the target voltage, the voltage detector 20 is turned on, so that the voltage at the output terminal OUT of the voltage detector 20 is switched from the voltage at the second input terminal VSS of the voltage detector 20 to the voltage at the first input terminal VCC of the voltage detector 20, that is, the output terminal OUT of the voltage detector 20 outputs the equalizing control signal. The first triode Q1 is turned on according to the equalizing control signal, and then the second triode Q2 is turned on, and the collector of the second triode Q2 outputs an equalizing start signal through the third resistor R3 and the fourth resistor R4. The first switch unit 321 is turned on according to the equalization start signal, the first resistor R1 and the second resistor R2 consume the electric energy of the single capacitor, until the voltage of the single capacitor is the target voltage, the divided voltage signal changes to be less than the equalization start voltage, the voltage detector 20 is turned off, the voltage of the output terminal OUT of the voltage detector 20 is switched from the voltage of the first input terminal VCC of the voltage detector 20 to the voltage of the second input terminal VSS of the voltage detector 20, the output terminal OUT of the voltage detector 20 does not output the equalization control signal any more, the first triode Q1, the second triode Q2 and the first switch unit 321 are all turned off, the first resistor R1 and the second resistor R2 stop consuming the electric energy of the single capacitor, and thus the voltage of the single capacitor is basically maintained at the target voltage.
Fig. 8 is a schematic structural diagram of another capacitor module voltage equalizing circuit 100 according to an embodiment of the present invention. Referring to fig. 8, in one embodiment of the present invention, the voltage divider circuit 10 further includes: a fourteenth resistor R14 and a fifteenth resistor R15. A first end of the fourteenth resistor R14 is connected to the first pole of the single capacitor, a second end of the fourteenth resistor R14 is connected to a first end of the fifteenth resistor R15, a second end of the fifteenth resistor R15 is connected to the second pole of the single capacitor, and an output end OUT of the voltage detector 20 is connected to a first end of the fifteenth resistor R15.
With continued reference to fig. 8, in one embodiment of the present invention, the capacitor module voltage equalization circuit 100 further includes: and a sixth switching unit. A first terminal of the sixth switch unit is connected to the second terminal of the fourth resistor R4, a second terminal of the sixth switch unit is connected to the first terminal of the fourth resistor R4, and a control terminal of the sixth switch unit is connected to the second terminal of the first switch unit 321. The sixth switching unit may include a fifth transistor Q5, the fifth transistor Q5 may be an NPN transistor, an emitter of the fifth transistor Q5 serves as a first terminal of the sixth switching unit, a base of the fifth transistor Q5 serves as a control terminal of the sixth switching unit, and a collector of the fifth transistor Q5 serves as a second terminal of the sixth switching unit. The sixth switching unit is used for stabilizing a high level, preventing the base voltage outgoing line of the first switching unit 321 from dropping, and better consuming the electric energy of the single capacitor, thereby better realizing balance.
The embodiment of the utility model also provides a voltage balancing system of the capacitor module. Fig. 9 is a schematic structural diagram of a voltage equalization system of a capacitor module according to an embodiment of the present invention. Referring to fig. 9, it is also illustrated in fig. 9 that the capacitor module includes a plurality of individual capacitors (e.g., individual capacitors C1, C2, C3,. cng), and the capacitor module voltage equalization system includes a plurality of capacitor module voltage equalization circuits (e.g., capacitor module voltage equalization circuits 100-1, 100-2, 100-3,... 100-n) as described in any of the above embodiments. The capacitor module voltage equalization circuits correspond to the monomer capacitors one by one; the capacitor module voltage equalization circuit is connected to a first pole of the corresponding cell capacitance through a first wire 61, and the capacitor module voltage equalization circuit is connected to a second pole of the corresponding cell capacitance through a second wire 62. With continued reference to fig. 9, the wire resistances r on the first wire 61 and the second wire 62 are also schematically illustrated in fig. 9. According to the technical scheme of the embodiment of the utility model, the capacitor module voltage equalization circuits are connected with the corresponding monomer capacitors by adopting the independent first lead 61 and the independent second lead 62, so that the situation that the second capacitor module voltage equalization circuit 100-2 is also started when the first capacitor module voltage equalization circuit 100-1 and the third capacitor module voltage equalization circuit 100-3 are started (namely, the electric energy of the corresponding monomer capacitors is consumed) due to the existence of the line resistance on the leads is avoided. The capacitor module voltage equalization system and the capacitor module voltage equalization circuit provided by the embodiment of the utility model belong to the same practical utility model concept, can realize the same technical effect, and repeated contents are not repeated herein.
It is to be noted that the foregoing description is only exemplary of the utility model and that the principles of the technology may be employed. Those skilled in the art will appreciate that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements and substitutions will now be apparent to those skilled in the art without departing from the scope of the utility model. Therefore, although the present invention has been described in some detail by the above embodiments, the utility model is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the utility model, and the scope of the utility model is determined by the scope of the appended claims.
Claims (10)
1. A capacitor module voltage equalization circuit, comprising:
a first input end of the voltage division circuit is connected with a first pole of the single capacitor, and a second input end of the voltage division circuit is connected with a second pole of the single capacitor; the voltage division circuit outputs a voltage division signal at the output end of the voltage division circuit according to the voltage of the single capacitor;
a first input end of the voltage detector is connected with the output end of the voltage division circuit, and a second input end of the voltage detector is connected with a second pole of the single capacitor; the voltage detector is used for changing the working state of the voltage detector when the divided voltage signal is equal to or greater than the balance starting voltage and outputting a balance control signal at the output end of the voltage detector;
A first input end of the balance adjusting circuit is connected with a first pole of the single capacitor, a second input end of the balance adjusting circuit is connected with a second pole of the single capacitor, and a control end of the balance adjusting circuit is connected with an output end of the voltage detector; the balance adjusting circuit is used for changing the working state of the balance adjusting circuit according to the balance control signal and adjusting the voltage of the single capacitor to a target voltage.
2. The capacitor module voltage equalization circuit of claim 1, wherein the equalization conditioning circuit comprises: a signal transmission unit and an equalization main loop;
the first input end of the signal transmission unit is connected with the first input end of the balance adjusting circuit, the second input end of the signal transmission unit is connected with the second input end of the balance adjusting circuit, and the third input end of the signal transmission unit is connected with the control end of the balance adjusting circuit; the signal transmission unit is used for outputting an equalization starting signal at the output end of the signal transmission unit according to the equalization control signal;
the first input end of the equalization main loop is connected with the first input end of the equalization adjusting circuit, the second input end of the equalization main loop is connected with the second input end of the equalization adjusting circuit, and the control end of the equalization main loop is connected with the output end of the signal transmission unit; the equalization main loop is used for changing the working state of the equalization main loop according to the equalization starting signal and adjusting the voltage of the single capacitor to a target voltage.
3. The capacitor module voltage equalization circuit of claim 2, wherein the equalization main loop comprises: the first switch unit and the energy consumption resistor;
the control end of the first switch unit is connected with the control end of the balance main loop, the first end of the first switch unit is connected with the first input end of the balance main loop, the second end of the first switch unit is connected with the first end of the energy consumption resistor, and the second end of the energy consumption resistor is connected with the second input end of the balance main loop.
4. The capacitor module voltage equalization circuit of claim 3, wherein the first switching unit comprises: a Darlington tube; the energy-consuming resistor comprises: a first resistor and a second resistor;
a control end of the Darlington tube is used as a control end of the first switch unit, a first end of the Darlington tube is used as a first end of the first switch unit, and a second end of the Darlington tube is used as a second end of the first switch unit;
the first end of the first resistor is connected with the first end of the energy consumption resistor, and the second end of the second resistor is connected with the second end of the energy consumption resistor; the second resistor is connected in parallel with the first resistor.
5. The capacitor module voltage equalization circuit of claim 2, wherein the signal transmission unit comprises: the circuit comprises a second switching unit, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor;
a first end of the second switch unit is connected with a second input end of the signal transmission unit, a control end of the second switch unit is connected with a third input end of the signal transmission unit, and a second end of the second switch unit is connected with a control end of the third switch unit;
a first end of the third switching unit is connected with a first input end of the signal transmission unit, and a second end of the third switching unit is connected with a first end of the third resistor;
the second end of the third resistor is connected with the output end of the signal transmission unit;
a first end of the fourth resistor is connected with a second end of the third resistor, and a second end of the fourth resistor is connected with a second input end of the signal transmission unit;
a first end of the fifth resistor is connected with a control end of the third switching unit, and a second end of the fifth resistor is connected with a first end of the sixth resistor;
And the second end of the sixth resistor is connected with the first end of the signal transmission unit.
6. The capacitor module voltage equalization circuit of claim 5, further comprising: a seventh resistor and a light-emitting reminding unit;
the first end of the seventh resistor is connected with the first end of the third resistor, the second end of the seventh resistor is connected with the first pole of the luminous reminding unit, and the second pole of the luminous reminding unit is connected with the second end of the fourth resistor.
7. The capacitor module voltage equalization circuit of claim 2, further comprising: a signal processing circuit;
the first input end of the signal processing circuit is connected with the first pole of the single capacitor, the second input end of the signal processing circuit is connected with the second pole of the single capacitor, the control end of the signal processing circuit is connected with the output end of the signal transmission unit, and the output end of the signal processing circuit is connected with an external control circuit; the signal processing circuit is used for changing the working state of the signal processing circuit according to the equalization starting signal and transmitting the equalization starting signal to the external control circuit.
8. The capacitor module voltage equalization circuit of claim 7, wherein the signal processing circuit comprises: the fourth switch unit, the fifth switch unit, the eighth resistor, the ninth resistor, the tenth resistor, the eleventh resistor and the photoelectric coupling unit;
a first end of the eighth resistor is connected with the control end of the signal processing circuit, and a second end of the eighth resistor is connected with the control end of the fourth switching unit;
a first end of the fourth switching unit is connected with the second input end of the signal transmission unit, and a second end of the fourth switching unit is connected with a first end of the ninth resistor;
the second end of the ninth resistor is connected with the first end of the tenth resistor;
a second end of the tenth resistor is connected with a first input end of the signal transmission unit;
a control end of the fifth switching unit is connected with a first end of the tenth resistor, a first end of the fifth switching unit is connected with a first input end of the signal transmission unit, and a second end of the fifth switching unit is connected with a first end of the photoelectric coupling unit;
the second end of the photoelectric coupling unit is connected with the external control circuit, and the third end of the photoelectric coupling unit is connected with the first end of the eleventh resistor;
And the second end of the eleventh resistor is connected with the second input end of the signal transmission unit.
9. The capacitor module voltage equalization circuit of claim 1, wherein the voltage divider circuit comprises: a twelfth resistor, a thirteenth resistor and a voltage dividing capacitor;
a first end of the twelfth resistor is connected with a first input end of the voltage division circuit, and a second end of the twelfth resistor is connected with an output end of the voltage division circuit;
a first pole of the voltage division capacitor is connected with a second end of the twelfth resistor, and a second pole of the voltage division capacitor is connected with a second input end of the voltage division circuit;
and the first end of the thirteenth resistor is connected with the first pole of the voltage division capacitor, and the second end of the thirteenth resistor is connected with the second input end of the voltage division circuit.
10. A capacitor module voltage equalization system, said capacitor module comprising a plurality of individual capacitors, said system comprising a plurality of capacitor module voltage equalization circuits according to any of claims 1-9;
the capacitor module voltage equalization circuits correspond to the single capacitors one by one;
the capacitor module voltage balancing circuit is connected with a first pole of the corresponding monomer capacitor through a first lead, and is connected with a second pole of the corresponding monomer capacitor through a second lead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122390314.5U CN216981536U (en) | 2021-09-29 | 2021-09-29 | Capacitor module voltage equalization circuit and system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122390314.5U CN216981536U (en) | 2021-09-29 | 2021-09-29 | Capacitor module voltage equalization circuit and system thereof |
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| Publication Number | Publication Date |
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| CN216981536U true CN216981536U (en) | 2022-07-15 |
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| CN202122390314.5U Active CN216981536U (en) | 2021-09-29 | 2021-09-29 | Capacitor module voltage equalization circuit and system thereof |
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| CN (1) | CN216981536U (en) |
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- 2021-09-29 CN CN202122390314.5U patent/CN216981536U/en active Active
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Address after: 261061 Shandong city in Weifang province Fu hi tech Industrial Development Zone, East Street No. 197 Patentee after: WEICHAI POWER Co.,Ltd. Patentee after: Weichai New Energy Power Technology Co.,Ltd. Address before: 261061 Shandong city in Weifang province Fu hi tech Industrial Development Zone, East Street No. 197 Patentee before: WEICHAI POWER Co.,Ltd. Patentee before: Weichai New Energy Technology Co.,Ltd. |