CN218850631U - Direct current bidirectional conversion circuit for battery - Google Patents
Direct current bidirectional conversion circuit for battery Download PDFInfo
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- CN218850631U CN218850631U CN202223072172.9U CN202223072172U CN218850631U CN 218850631 U CN218850631 U CN 218850631U CN 202223072172 U CN202223072172 U CN 202223072172U CN 218850631 U CN218850631 U CN 218850631U
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Abstract
The application relates to a direct current bidirectional conversion circuit for a battery, which comprises two direct current sources, an input filter capacitor, an output filter capacitor, a voltage reduction switch, two follow current switches, an energy storage inductor and a control unit; the input filter capacitor and the output filter capacitor are respectively connected with two direct current sources; the voltage reduction switch is connected with the high-voltage direct current source and the energy storage inductor; the first follow current switch is connected with the energy storage inductor, and the second follow current switch is connected with the two direct current sources; the output filter capacitor is connected with the two follow current switches; the control unit is connected with the two direct current sources, the voltage reduction switch and the two follow current switches. The utility model discloses a control unit judges the mode and controls step-down switch and two afterflow switches and work under corresponding mode, can effectively promote the pressure boost that realizes the wideer scope, obtain bigger gain and the step-down duty cycle of stepping up and less step-down decay to better satisfying the use of product such as battery class broad voltage range, obtaining better price/performance ratio.
Description
Technical Field
The application relates to the technical field of converters for switching power supplies and batteries, in particular to a direct-current bidirectional conversion circuit for a battery.
Background
With the increasing application of power batteries, the batteries or battery packs need to be charged or discharged by using direct current, the voltage range of the batteries or battery packs with 1.5V to 5V is wide, and in practical use, a wide-range direct current power supply or equivalent loads like the batteries or battery packs need to be supplied or discharged, the traditional battery conversion circuit adopts a simplest BUCK/BOOST (voltage reduction/BOOST) circuit, and because the voltage range needs to be increased from 1.5V to 14V or reduced from 14V to 1.5V, the traditional circuit has a duty ratio greater than 90% and close to 1 in circuit conversion, or is lower than 10% and close to 0, so that the ripple wave is caused by limited duty ratio adjustment, poor circuit element selection, or relatively low efficiency, large current and the like. The use of conventional buck/boost converters is therefore limited. In order to change the use limitation of the specific application scene, some people try to use an isolated transformer scheme, that is, the principle that the turn ratio of the transformer can transform is utilized to increase the low voltage to the high voltage, so that the situation that the duty ratio is relatively limited in the circuit transformation is avoided as much as possible; but this scheme is because the great conduction loss of converter can appear in the heavy current under the low-voltage condition, simultaneously because isolation converter is comparatively complicated, compare non-isolated form converter and introduce new loss again, the cost also has great increase simultaneously, also is not the preferred scheme of price/performance ratio height in the actual scheme yet, consequently is necessary to be useful in the utility model a new circuit, both can not have great change by ordinary non-isolated form BUCK/BOOST circuit cost and efficiency relatively, but can solve the duty cycle problem of low-voltage heavy current and wide range step-up-down simultaneously again.
Disclosure of Invention
An object of the utility model is to provide a direct current bidirectional conversion circuit that can be used to battery can effectively promote the pressure boost that realizes the wideer scope, obtains bigger gain and the step-down duty cycle of stepping up and less step-down decay to better satisfying the use of the product such as battery class broad voltage range, obtaining better price/performance ratio.
The utility model discloses a technical scheme who takes is: a direct current bidirectional conversion circuit for a battery comprises a high-voltage direct current source, an input filter capacitor, a voltage reduction switch, a first follow current switch, a second follow current switch, an energy storage inductor, an output filter capacitor, a low-voltage direct current source and a control unit; two ends of the input filter capacitor are connected with the positive end and the negative end of the high-voltage direct current source; the voltage reduction switch is connected with the high-voltage direct current source, the energy storage inductor and the control unit; the first follow current switch is connected with the energy storage inductor and the control unit, and the second follow current switch is connected with the negative end of the high-voltage direct current source, the positive end of the low-voltage direct current source and the control unit; two ends of the output filter capacitor are respectively connected with the first follow current switch and the second follow current switch and are also connected with the positive end and the negative end of the low-voltage direct current source; the control unit is also connected with a high-voltage direct current source and a low-voltage direct current source.
Further, the energy storage inductor is composed of two highly tightly coupled windings or two separate inductors; when the energy storage inductor is two coupling windings which are highly tightly coupled, the number of turns and the inductance of the two coupling windings are the same; when the energy storage inductor is an independent inductor, the inductance of the two inductors is the same; the first follow current switch is connected with the homonymous ends of the two coupling windings or the two inductors; the second freewheeling switch is connected with the two coupling windings or the different name ends of the two inductors.
Further, the voltage reduction switch is connected with the positive end or the negative end of the high-voltage direct current source; when the voltage reduction switch is connected with the positive end of the high-voltage direct-current source, the voltage reduction switch is connected with the first coupling winding or the dotted end of the first inductor; when the voltage reduction switch is connected with the negative end of the high-voltage direct current source, the voltage reduction switch is connected with the second coupling winding or the synonym end of the second inductor.
Furthermore, the voltage reduction switch, the first freewheeling switch and the second freewheeling switch are switching tubes or diodes which are provided with antiparallel diodes and can be switched on and off at high frequency; the reverse parallel diode is an integrated diode, a parasitic diode or an additional independent diode; the input filter capacitor and the output filter capacitor are small-capacity high-frequency nonpolar capacitors or large-capacity electrolytic capacitors.
Further, the control unit comprises a signal sampling unit, an arithmetic processing unit, a driving unit and an auxiliary power supply; and a signal sampling bus of the signal sampling unit, a power bus of the auxiliary power supply and a driving signal of the driving unit are respectively connected with the high-voltage direct-current source, the low-voltage direct-current source, the voltage reduction switch and the follow current switch.
The utility model discloses another kind of technical scheme who takes is: a control method of a direct current bidirectional conversion circuit for a battery is used for controlling the direct current bidirectional conversion circuit in the technical scheme, and comprises the following steps:
s1: the control unit detects a high-voltage direct-current source voltage signal and a low-voltage direct-current source voltage signal or receives an external communication command;
s2: the control unit judges whether the working mode is a boosting mode or a voltage reduction mode; when the required output power supply voltage is higher than the input power supply voltage, the step-up mode is adopted, and when the required output power supply voltage is lower than the input power supply voltage, the step-down mode is adopted;
s3: the control unit applies corresponding driving control signals to the voltage reduction switch, the first follow current switch and the second follow current switch to control the voltage reduction switch, the first follow current switch and the second follow current switch to work in corresponding modes.
Furthermore, when the control unit judges that the direct-current bidirectional conversion circuit needs to work in a boosting interval, the first follow current switch and the second follow current switch work in a boosting mode, the voltage reduction switch is equivalently used as a diode, and the control unit applies PWM (pulse width modulation) driving signals to the first follow current switch and the second follow current switch to enable the first follow current switch and the second follow current switch to store energy to the energy storage inductor so as to realize boosting;
when the control unit judges that the direct-current bidirectional conversion circuit needs to work in a voltage reduction interval, the voltage reduction switch works in a voltage reduction mode, the control unit applies a PWM (pulse width modulation) driving signal to the voltage reduction switch to enable the voltage reduction switch to carry out voltage reduction work, and at the moment, the first freewheeling switch and the second freewheeling switch are used as freewheeling diodes.
Further, when the step-down switch, the first freewheel switch and the second freewheel switch are equivalently used as a diode and have the functions of the MOSFET tubes, when the step-down switch, the first freewheel switch and the second freewheel switch are turned on, the PWM driving signal is applied to the step-down switch, the first freewheel switch and the second freewheel switch, so that a synchronous rectification function is realized, and the conduction loss of the diode is reduced.
The beneficial effects of the utility model reside in that:
(1) Compared with the prior art, the utility model can realize the voltage boosting in a wider range, obtain larger gain and output stable voltage; the step-down attenuation ratio is reduced, so that larger duty ratio conduction is realized, the inductor follow current ripple current is reduced, the follow current loss is reduced, and high efficiency is realized; compared with the traditional voltage stabilizer needing two stages, the voltage stabilizer has smaller volume and higher cost performance;
(2) The utility model has two working modes of boosting and reducing voltage, under the boosting mode, two coupling windings or inductors can be connected in parallel to store energy, and when releasing energy, the two coupling windings or inductors form a series connection relation in the circuit, thereby improving the boosting ratio; in a voltage reduction mode, the two coupling windings or the two inductors form series voltage division and energy storage in a loop, and form a parallel connection follow current relation in the loop when releasing energy, so that the voltage reduction attenuation ratio is reduced; the utility model discloses can realize the effective extension of the step-up ratio or step-down ratio in the wide range, effectively change the loss under these two kinds of modes, realize efficiency promotion and energy-conservation.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic circuit structure diagram of embodiment 1 of the present invention;
fig. 2 is a block diagram of a control unit according to embodiment 1 of the present invention;
fig. 3 is a schematic view of the operation in the depressurization mode according to embodiment 1 of the present invention;
fig. 4 is a schematic view of the boost mode operation of embodiment 1 of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and the present invention is not limited to the specific embodiments disclosed below.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The use of "first," "second," and similar terms in the description and claims of this patent application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.
A direct current bidirectional conversion circuit for a battery comprises a high-voltage direct current source, an input filter capacitor C1, a voltage reduction switch Q1, a first follow current switch Q2, a second follow current switch Q3, an energy storage inductor, an output filter capacitor C2, a low-voltage direct current source and a control unit; two ends of the input filter capacitor C1 are connected with positive and negative ends DCH + and DCH-of a high-voltage direct current source; the voltage reduction switch Q1 is connected with the high-voltage direct current source, the energy storage inductor and the control unit; the first follow current switch Q2 is connected with the energy storage inductor and the control unit, and the second follow current switch Q2 is connected with the negative terminal DCH of the high-voltage direct current source, the positive terminal DCL + of the low-voltage direct current source and the control unit; two ends of the output filter capacitor C2 are respectively connected with the first follow current switch Q2 and the second follow current switch Q3, and are also connected with the positive and negative ends DCL + and DCL-of the low-voltage direct current source; the control unit is also connected with a high-voltage direct current source and a low-voltage direct current source.
In an embodiment of the present invention, the energy storage inductor is composed of two highly tightly coupled coupling windings or two separate inductors; when the energy storage inductor is two coupling windings which are highly tightly coupled, the number of turns and the inductance of the two coupling windings are the same; when the energy storage inductor is an independent inductor, the inductance of the two inductors is the same; the first follow current switch is connected with the homonymous ends of the two coupling windings or the two inductors; the second freewheeling switch is connected with the synonym terminals of the two coupling windings or the two inductors. The voltage reduction switch Q1, the first freewheeling switch Q2 and the second freewheeling switch Q3 are switching tubes or diodes which are provided with reverse parallel diodes and can be switched on and off at high frequency; the reverse parallel diode is an integrated diode, a parasitic diode or an additional independent diode; the input filter capacitor C1 and the output filter capacitor C2 are small-capacity high-frequency nonpolar capacitors or large-capacity electrolytic capacitors.
The voltage reduction switch Q1 is connected with a positive end DCH + or a negative end DCH-of the high-voltage direct current source; when the voltage reduction switch Q1 is connected with the positive end DCH + of the high-voltage direct current source, the voltage reduction switch Q1 is connected with the first coupling winding or the dotted terminal of the first inductor; when the buck switch Q1 is connected to the negative terminal DCH-of the high voltage dc source, the buck switch Q1 is connected to the synonym terminal of the second coupling winding or the second inductor.
The control unit comprises a signal sampling unit, an arithmetic processing unit, a driving unit and an auxiliary power supply; and a signal sampling bus of the signal sampling unit, a power bus of the auxiliary power supply and a driving signal of the driving unit are respectively connected with the high-voltage direct-current source, the low-voltage direct-current source, the voltage reduction switch and the follow current switch. The control unit may further include a communication unit so that the control unit can communicate with the outside.
The working principle of the present invention is explained below with reference to the following embodiments:
example 1
As shown in fig. 1 to 4, a dc bidirectional conversion circuit for a battery includes a high voltage dc source, an input filter capacitor C1, a voltage-reducing switch Q1, a first freewheeling switch Q2, a second freewheeling switch Q3, an energy-storage inductor, an output filter capacitor C2, a low voltage dc source, and a control unit. The energy storage inductor is composed of a first coupling winding L1-1 and a second coupling winding L1-2 which are closely coupled, and the voltage reduction switch Q1, the first follow current switch Q2 and the second follow current switch Q3 are all switching tubes which are provided with reverse parallel diodes and can be switched on and off at high frequency. Two ends of the input filter capacitor C1 are connected with positive and negative ends DCH + and DCH-of the high-voltage direct current source; the drain electrode of the voltage reduction switch Q1 is connected with the positive end DCH + of the high-voltage direct-current source, the source electrode of the voltage reduction switch Q1 is connected with the drain electrode of the first follow current switch Q2 and the dotted terminal of the first coupling winding L1-1, and the base electrode of the voltage reduction switch Q1 is connected with the control unit. The source electrode of the first follow current switch Q2 is connected with the dotted terminal of the second coupling winding L1-2 and the negative terminal DCL-of the low-voltage direct current source, and the base electrode is connected with the control unit. The source electrode of the second follow current switch Q3 is connected with the synonym end of the second coupling winding L1-2, the drain electrode of the second follow current switch Q3 is connected with the synonym end of the first coupling winding L1-1, and the base electrode of the second follow current switch Q3 is connected with the control unit. Two ends of the output filter capacitor C2 are connected with the source electrode of the first follow current switch Q2 and the drain electrode of the second follow current switch Q3, and are also connected with the positive and negative ends DCL + and DCL-of the low-voltage direct current source. The control unit is also connected with the high-voltage direct current source and the low-voltage direct current source.
The control method of embodiment 1 includes the steps of:
s1: the control unit detects a high-voltage direct-current source voltage signal and a low-voltage direct-current source voltage signal or receives an external communication command;
s2: the control unit judges whether the working mode is a boosting mode or a voltage reduction mode; when the required output power supply voltage is higher than the input power supply voltage, the step-up mode is adopted, and when the required output power supply voltage is lower than the input power supply voltage, the step-down mode is adopted;
s3: the control unit applies corresponding driving control signals to the voltage reduction switch Q1, the first follow current switch Q2 and the second follow current switch Q3, and controls the voltage reduction switch Q1, the first follow current switch Q2 and the second follow current switch Q3 to work in corresponding modes.
When the control unit judges that the direct-current bidirectional conversion circuit needs to work in a boosting interval, the first follow current switch Q2 and the second follow current switch Q3 work in a boosting mode, the voltage reduction switch Q1 is equivalently used as a diode, and the control unit applies PWM (pulse width modulation) driving signals to the first follow current switch Q2 and the second follow current switch Q3 to enable the first follow current switch Q2 and the second follow current switch Q3 to store energy to the energy storage inductor so as to realize boosting;
when the control unit judges that the direct-current bidirectional conversion circuit needs to work in a voltage reduction interval, namely a high-voltage direct-current source end is converted into low voltage, the voltage reduction switch Q1 works in a voltage reduction mode, the control unit applies a PWM driving signal to the voltage reduction switch Q1 to enable the voltage reduction switch Q1 to carry out voltage reduction work, and at the moment, the first freewheeling switch Q2 and the second freewheeling switch Q3 are used as freewheeling diodes.
When step-down switch Q1, first freewheel switch Q2 and second freewheel switch Q3 are used as the diode by the equivalence, and step-down switch Q1, when first freewheel switch Q2 and second freewheel switch Q3 have the function of MOSFET pipe, when step-down switch Q1, first freewheel switch Q2 and second freewheel switch Q3 switch on, exert the PWM drive signal to step-down switch Q1, first freewheel switch Q2 and second freewheel switch Q3, realize synchronous rectification function, reduce diode conduction loss.
The control unit is operated by a program in the operation processor unit through a voltage signal sampled by the signal sampling unit or a command obtained by external communication, and when the control unit judges that the control unit needs to work in a voltage reduction mode, namely, the voltage is converted from high voltage to low voltage, the first follow current switch Q2 and the second follow current switch Q3 have a follow current function and can be regarded as a follow current diode, a driving signal does not need to be applied, or the driving signal is applied to perform synchronous rectification work when the anti-parallel diode is conducted. The buck switch Q1 needs to apply a PWM signal for buck conversion. At this time, when the rectified input voltage is higher than the conversion output part, the rectified input voltage is respectively reduced on the first coupling winding L1-1 and the second coupling winding L1-2 for energy storage, the direction of the electromotive force is as shown in fig. 3 (a), and the current returns to the second coupling winding L1-2 from the positive end DCH + of the high-voltage direct current source through the voltage reduction switch Q1, the first coupling winding L1-1, the low-voltage direct current source and the output filter capacitor C2, and then returns to the negative end DCH-of the high-voltage direct current source. When the driving signal of the voltage-reducing switch Q1 is turned off, the voltage-reducing switch Q1 is changed from a connection conduction state to a disconnection state, and the current cannot change abruptly and reversely due to the action of the energy-storage inductor, so that the first follow current switch Q2 is biased by the first coupling winding L1-1 to conduct follow current, the second follow current switch Q3 is biased by the second coupling winding L1-2 to conduct follow current, a high-voltage direct-current source is replaced to form a complete follow current channel, and a relevant loop is shown in fig. 3 (b).
Assuming that the load is sufficient to make the current of the energy storage inductor continuous or critical, it can be seen from the above analysis that the duty ratio of the PWM of the buck switch Q1 is D, vl during energy storage 1-1 +Vl 1-2 = Vin-Vo =2Vl, wherein Vl 1-1 For the voltage, vl, of the first coupling winding L1-1 at the moment when the step-down switch Q1 is switched on to store energy 1-2 The voltage of the second coupling winding L1-2 at the moment when the voltage reduction switch Q1 is switched on for energy storage is adopted, vin is input voltage, and Vo is output voltage; the voltages of the first coupling winding L1-1 and the second coupling winding L1-2 at the moment when the energy storage switch Q1 is switched on are consistent and are uniformly marked as Vl. When the voltage reducing switch Q1 is driven to close follow current and release energy, the duty ratio is 1-D, and the potential voltage Vl on the first coupling winding L1-1 and the second coupling winding L1-2 1-1 ＝Vl 1-2 = Vo. According to the volt-second balance principle, (Vin-Vo) × D × T/2= Vo × (1-D) × T, wherein T is the switching period of the direct current bidirectional conversion circuit; therefore, vo = Vin × D/(2-D), and since 1 > D > 0, it can be known that D/(2-D) < D, in the step-down mode, compared with the conventional circuit, a larger duty ratio is required to obtain the same voltage, that is, the step-down attenuation coefficient is reduced, the duty ratio is effectively increased, the follow-up time is reduced, and the current ripple is also reduced.
When the step-up mode needs to be operated, namely the low-voltage direct-current source end is converted into high voltage, the step-down switch Q1 is regarded as a diode, a driving signal does not need to be applied, or the driving signal is applied to perform synchronous rectification operation when the step-down switch Q1 is conducted with an anti-parallel diode. The first follow current switch Q2 and the second follow current switch Q3 are used as boost switch tubes, and PWM signals are applied to carry out boost conversion. At this time, the input voltage of the low-voltage dc source is directly applied to the first coupling winding L1-1 and the second coupling winding L1-2 respectively for energy storage, and the electromotive force direction is as shown in fig. 4 (a), and at this time, there are two current paths. In the first current path, the current flows from the positive terminal DCL + of the low-voltage DC source, through the first coupling winding L1-1, the first freewheeling switch Q2, and back to the negative terminal DCL-of the low-voltage DC source. In the first current path, the current flows from the positive terminal DCL + of the low-voltage DC source, through the second freewheeling switch Q3, the second coupling winding L1-2, and back to the negative terminal DCL-of the low-voltage DC source. When the driving signals of the first freewheeling switch Q2 and the second freewheeling switch Q3 are turned off, the first freewheeling switch Q2 and the second freewheeling switch Q3 are changed from a connection conducting state to a disconnection state, and the current cannot change suddenly and reversely due to the action of the energy storage inductor, so that the first coupling winding L1-1 and the second coupling winding L1-2 both have reverse electromotive force, and are connected in series in a loop. Therefore, the voltage-reducing switch Q1 is biased by the first coupling winding L1-1 and the second coupling winding L1-2 to conduct follow current, and the current returns to the second coupling winding L1-2 from the positive end DCL + of the low-voltage direct current source through the first coupling winding L1-1, the voltage-reducing switch Q1, the high-voltage direct current source and the input filter capacitor C1, and then returns to the negative end DCL-of the low-voltage direct current source, and the related energy-releasing follow current loop is shown in FIG. 4 (b).
Assuming that the load is enough to make the current of the energy storage inductor continuous or critical, it can be seen from the above analysis that, when energy is stored, the conduction duty ratio of the first freewheeling switch Q2 and the second freewheeling switch Q3 is D, and the voltages on the first coupling winding L1-1 and the second coupling winding L1-2 satisfy: vl 1-1 = Vin = Vl. When follow current releases energy, the conduction duty ratio of the voltage reduction switch Q1 is 1-D, and the voltages on the first coupling winding L1-1 and the second coupling winding L1-2 meet the following conditions: vl 1-1 ＝Vl 1-2 ，Vin+(Vl 1 -1+Vl 1-2 ) = Vo. From volt-second equilibrium theorem, vin x DT = (Vo-Vin) ((1-D) × T/2), so Vo = Vin: (1 + D)/(1-D), and since 1 > D > 0, (1 + D)/(1-D) > 1/(1-D) can be known, in the boost mode, compared with a traditional circuit, the same voltage can be obtained only by a slightly smaller duty ratio, namely, the boost ratio is effectively increased, the energy storage time is reduced, and the boost range is expanded.
Example 2
The circuit structure of the embodiment 2 is basically the same as that of the embodiment 1, except that the voltage-reducing switch Q1 is arranged on a negative terminal loop of the high-voltage direct-current source, that is, the source of the voltage-reducing switch Q1 is connected with the negative terminal DCH "of the high-voltage direct-current source, the drain is connected with the drain of the first freewheeling switch Q2 and the synonym terminal of the second coupling winding L1-2, the base is connected with the control unit, and the connection relationship of the rest components is unchanged.
The control method and operation principle of embodiment 2 are the same as those of embodiment 1, and are not described herein again.
Example 3
Embodiment 3 is the same as embodiment 1 or embodiment 2 in that the first freewheel switch Q2 and the second freewheel switch Q3 are provided as diodes, and the circuit connection relationship and the control method are not changed. At this time, embodiment 3 can only be used as a buck converter, the operation principle is the same as that of embodiment 1 in the buck mode, and only at this time, the first freewheeling switch Q2 and the second freewheeling switch Q3 do not have the synchronous rectification function, and detailed description is omitted here.
Example 4
Embodiment 4 is based on embodiment 1 or embodiment 2, and the step-down switch Q1 is provided as a diode, and the circuit connection relationship and the control mode are not changed. At this time, embodiment 4 can only be used as a boost converter, and the operation principle is the same as that of embodiment 1 in the boost mode, except that the buck switch Q1 does not have the synchronous rectification function, and details are not described here.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A direct current bidirectional conversion circuit for a battery is characterized by comprising a high-voltage direct current source, an input filter capacitor, a voltage reduction switch, a first follow current switch, a second follow current switch, an energy storage inductor, an output filter capacitor, a low-voltage direct current source and a control unit; two ends of the input filter capacitor are connected with the positive end and the negative end of the high-voltage direct current source; the voltage reduction switch is connected with the high-voltage direct current source, the energy storage inductor and the control unit; the first follow current switch is connected with the energy storage inductor and the control unit, and the second follow current switch is connected with the negative end of the high-voltage direct-current source, the positive end of the low-voltage direct-current source and the control unit; two ends of the output filter capacitor are respectively connected with the first follow current switch and the second follow current switch and are also connected with the positive end and the negative end of the low-voltage direct current source; the control unit is also connected with a high-voltage direct current source and a low-voltage direct current source.
2. The DC bi-directional conversion circuit for battery of claim 1, wherein the energy storage inductor is composed of two coupled windings with high coupling or two separate inductors; when the energy storage inductor is two coupling windings which are highly tightly coupled, the number of turns and the inductance of the two coupling windings are the same; when the energy storage inductor is an independent inductor, the inductance of the two inductors is the same; the first follow current switch is connected with the homonymous ends of the two coupling windings or the two inductors; the second freewheeling switch is connected with the synonym terminals of the two coupling windings or the two inductors.
3. The dc bi-directional converter circuit for a battery as claimed in claim 2, wherein the buck switch is connected to the positive or negative terminal of the high voltage dc source; when the voltage reduction switch is connected with the positive end of the high-voltage direct current source, the voltage reduction switch is connected with the same-name end of the first coupling winding or the first inductor; when the voltage reduction switch is connected with the negative end of the high-voltage direct current source, the voltage reduction switch is connected with the second coupling winding or the synonym end of the second inductor.
4. The direct-current bidirectional conversion circuit applicable to the battery according to claim 1, wherein the step-down switch, the first freewheeling switch and the second freewheeling switch are switch transistors or diodes with antiparallel diodes, which can be turned on and off at high frequency; the reverse parallel diode is an integrated diode, a parasitic diode or an additional independent diode; the input filter capacitor and the output filter capacitor are small-capacity high-frequency nonpolar capacitors or large-capacity electrolytic capacitors.
5. The direct current bidirectional conversion circuit applicable to the battery according to claim 1, wherein the control unit comprises a signal sampling unit, an arithmetic processing unit, a driving unit and an auxiliary power supply; and a signal sampling bus of the signal sampling unit, a power bus of the auxiliary power supply and a driving signal of the driving unit are respectively connected with the high-voltage direct-current source, the low-voltage direct-current source, the voltage reduction switch and the follow current switch.
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| CN202223072172.9U CN218850631U (en) | 2022-11-17 | 2022-11-17 | Direct current bidirectional conversion circuit for battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223072172.9U CN218850631U (en) | 2022-11-17 | 2022-11-17 | Direct current bidirectional conversion circuit for battery |
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| CN218850631U true CN218850631U (en) | 2023-04-11 |
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