CN111384860A - DC/DC converter circuit and DC/DC converter - Google Patents

DC/DC converter circuit and DC/DC converter Download PDF

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Publication number
CN111384860A
CN111384860A CN202010100259.9A CN202010100259A CN111384860A CN 111384860 A CN111384860 A CN 111384860A CN 202010100259 A CN202010100259 A CN 202010100259A CN 111384860 A CN111384860 A CN 111384860A
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China
Prior art keywords
circuit
switching
diode
switch
input
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Chinese (zh)
Inventor
郭超群
梁舒展
王绍煦
刘旭明
黎文权
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SHENZHEN KEHUA TECHNOLOGY Co.,Ltd.
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Shenzhen Kehua Technology Co ltd
Xiamen Kehua Hengsheng Co Ltd
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Priority to CN202010100259.9A priority Critical patent/CN111384860A/en
Publication of CN111384860A publication Critical patent/CN111384860A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a DC/DC converter circuit, comprising: m switching circuits, m transformers, n rectifying circuits, n-1 first controllable switches and 2n-2 second controllable switches; each transformer comprises m secondary windings, m and n are positive integers greater than or equal to 2, each switching circuit comprises at least one bridge arm, and each bridge arm comprises 2 switching tubes connected in series; the output of the circuit in a wide voltage range is realized by mutually connecting the secondary windings of the m transformers in series; the first controllable switch and the second controllable switch are switched on to control the serial and parallel connection of the circuit output, and by using a simple and reliable circuit structure, no matter the circuit output is in the serial connection or in the parallel connection, the power balance of the circuit can be realized under the condition that the uniform power control circuit is not added, so that the cost is reduced. In addition, the invention also discloses a DC/DC converter which also has the beneficial effects.

Description

DC/DC converter circuit and DC/DC converter
Technical Field
The present invention relates to the field of electronic circuits, and more particularly, to a DC/DC converter circuit and a DC/DC converter.
Background
In the DC-DC conversion topology of the charging module of the new energy automobile, along with the gradual increase of the output power of the circuit, each topology circuit adopts corresponding series-parallel combination to distribute power so as to realize the output of high power and wide voltage range, so the power balance of the topology is very important.
The series and parallel combination mode of each topological circuit is not limited to four conditions of primary side parallel-secondary side series, primary side series-secondary side parallel, primary side parallel-secondary side parallel and primary side series-secondary side series of the transformer. The primary side parallel-secondary side series and the primary side series-secondary side parallel circuit structures can realize automatic voltage sharing of the circuit, but the secondary side series structure is difficult to realize output of large current and large power; the circuit structure of the primary side serial-secondary side parallel circuit is difficult to realize the output in a wide voltage range; the topology of primary side parallel-secondary side parallel and primary side serial-secondary side serial cannot realize uniform power, and a uniform power control circuit needs to be additionally added to realize power balance.
In the prior art, in most DC/DC converter circuits outputting wide voltage range and large current, a primary side parallel-secondary side series or parallel circuit structure is adopted, and balanced distribution of output power is realized by adding a uniform power control circuit at an output part; however, after the power control circuit is equalized, not only the area of the PCB layout and the board layout is occupied and the cost is increased, but also the risk of control failure is introduced. Therefore, how to provide a simple and reliable DC/DC converter circuit, which can achieve power balance without adding a uniform power control circuit, is a problem that needs to be solved nowadays.
Disclosure of Invention
The invention aims to provide a DC/DC converter circuit and a DC/DC converter, which can realize power balance of the circuit without adding a uniform power control circuit by using a simple and reliable circuit structure.
To solve the above technical problem, the present invention provides a DC/DC converter circuit, including: m switching circuits, m transformers, n rectifying circuits, n-1 first controllable switches and 2n-2 second controllable switches; each transformer comprises m secondary windings, m and n are positive integers greater than or equal to 2, each switching circuit comprises at least one bridge arm, and each bridge arm comprises 2 switching tubes connected in series;
the first input end and the second input end of each switch circuit are used as two direct current input ends to input direct current; the first output end of each switch circuit is connected with the first end of the primary winding of the corresponding transformer in a one-to-one manner, and the second output end of each switch circuit is connected with the second end of the primary winding of the corresponding transformer in a one-to-one manner;
the second end of the jth secondary winding of the ith transformer is connected with the first end of the jth secondary winding of the (i + 1) th transformer, the first end of the jth secondary winding of the 1 st transformer is connected with the first input end of the jth rectifying circuit, and the second end of the jth secondary winding of the mth transformer is connected with the second input end of the jth rectifying circuit; i is a positive integer less than or equal to m-1, j is a positive integer less than or equal to n;
the second output end of the kth rectifying circuit is connected with the first output end of the (k + 1) th rectifying circuit through a corresponding first controllable switch, the first output end of the (k + 1) th rectifying circuit is connected with the first output end of the 1 st rectifying circuit through a corresponding second controllable switch, and the second output end of the (k + 1) th rectifying circuit is connected with the second output end of the 1 st rectifying circuit through a corresponding second controllable switch; k is a positive integer less than or equal to n-1.
Optionally, a first input terminal of the ith switch circuit is connected to a first input terminal of the (i + 1) th switch circuit, and a second input terminal of the ith switch circuit is connected to a second input terminal of the (i + 1) th switch circuit.
Optionally, the DC/DC converter circuit further comprises m inductors and m first capacitors;
the first output end of each switching circuit is connected with the first end of the primary winding of the corresponding transformer in a one-to-one manner through the corresponding inductor, and the second output end of each switching circuit is connected with the second end of the primary winding of the corresponding transformer in a one-to-one manner through the corresponding first capacitor.
Optionally, when the rectifying circuit is a full-wave rectifying bridge circuit, the rectifying circuit includes: a first diode, a second diode, a third diode and a fourth diode;
the cathode of the first diode and the anode of the second diode are connected, the common end of the cathode of the second diode and the cathode of the third diode is connected, the first output end of the rectification circuit is used as the first output end of the rectification circuit, the common end of the anode of the third diode and the cathode of the fourth diode is connected, the second input end of the rectification circuit is used as the second input end of the rectification circuit, and the common end of the anode of the fourth diode and the anode of the first diode is connected, the second output end of the rectification circuit is used as the second output end of the rectification circuit.
Optionally, when the switch circuit is a full bridge circuit, the switch circuit includes: the first switching tube, the second switching tube, the third switching tube and the fourth switching tube;
the first end of the first switch tube and the first end of the second switch tube are connected with the common end of the first switch tube to serve as the first input end of the switch circuit, the second end of the second switch tube and the first end of the third switch tube are connected with the common end of the third switch tube to serve as the second output end of the switch circuit, the second end of the first switch tube and the first end of the fourth switch tube are connected with the common end of the first switch tube to serve as the first output end of the switch circuit, and the second end of the third switch tube and the second end of the fourth switch tube are connected with the common end of the fourth switch tube to serve as the second input end of the switch circuit.
Optionally, when the switching circuit is a half-bridge circuit, the switching circuit includes: a fifth switching tube and a sixth switching tube;
the first end of the fifth switching tube is used as the first input end of the switching circuit, the common end of the second end of the fifth switching tube and the first end of the sixth switching tube is connected and used as the first output end of the switching circuit, and the second end of the sixth switching tube is used as the second output end and the second input end of the switching circuit.
Optionally, the switching circuit further includes: a third diode, a fourth diode, a second capacitor, and a third capacitor;
the cathode of the third diode and the first end of the second capacitor are connected with the first end of the fifth switching tube, the common end of the third diode and the first end of the second capacitor is used as the first input end of the switching circuit, the anode of the third diode is connected with the cathode of the fourth diode, the second end of the second capacitor is connected with the first end of the third capacitor, the anode of the fourth diode and the second end of the third capacitor are connected with the second end of the sixth switching tube, the common end of the fourth diode and the first end of the third capacitor is used as the second input end of the switching circuit, and the common end of the cathode of the fourth diode and the first end of the third capacitor is connected with the second output end of the switching circuit.
Optionally, m and n are both 2.
Optionally, 2 of the switch tubes included in each of the bridge arms are specifically PMOS tubes.
The present invention also provides a DC/DC converter including:
such as the DC/DC converter circuit described above.
The invention provides a DC/DC converter circuit, comprising: m switching circuits, m transformers, n rectifying circuits, n-1 first controllable switches and 2n-2 second controllable switches; each transformer comprises m secondary windings, m and n are positive integers greater than or equal to 2, each switching circuit comprises at least one bridge arm, and each bridge arm comprises 2 switching tubes connected in series; the first input end and the second input end of each switching circuit are used as two direct current input ends to input direct current; the first output end of each switching circuit is connected with the first end of the primary winding of the corresponding transformer in a one-to-one manner, and the second output end of each switching circuit is connected with the second end of the primary winding of the corresponding transformer in a one-to-one manner; the second end of the jth secondary winding of the ith transformer is connected with the first end of the jth secondary winding of the (i + 1) th transformer, the first end of the jth secondary winding of the 1 st transformer is connected with the first input end of the jth rectifying circuit, and the second end of the jth secondary winding of the mth transformer is connected with the second input end of the jth rectifying circuit; i is a positive integer less than or equal to m-1, j is a positive integer less than or equal to n; the second output end of the kth rectifying circuit is connected with the first output end of the (k + 1) th rectifying circuit through a corresponding first controllable switch, the first output end of the (k + 1) th rectifying circuit is connected with the first output end of the 1 st rectifying circuit through a corresponding second controllable switch, and the second output end of the (k + 1) th rectifying circuit is connected with the second output end of the 1 st rectifying circuit through a corresponding second controllable switch; k is a positive integer less than or equal to n-1;
therefore, the output of the circuit in a wide voltage range is realized by mutually connecting the secondary windings of the m transformers in series; the first controllable switch and the second controllable switch are switched on to control the serial and parallel connection of the circuit output, and by using a simple and reliable circuit structure, no matter the circuit output is in the serial connection or in the parallel connection, the power balance of the circuit can be realized under the condition that the uniform power control circuit is not added, so that the cost is reduced. In addition, the invention also provides a DC/DC converter, which also has the beneficial effects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a circuit diagram of a DC/DC converter circuit according to an embodiment of the present invention;
FIG. 2 is a circuit output showing diagram of a DC/DC converter circuit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of another DC/DC converter circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a structural diagram of a DC/DC converter circuit according to an embodiment of the present invention. The DC/DC converter circuit may include: m switching circuits 10, m transformers 20, n rectifying circuits 30 and n-1 first controllable switches 40 and 2n-2 second controllable switches 50; each transformer 20 comprises m secondary windings, m and n are positive integers greater than or equal to 2, each switching circuit comprises at least one bridge arm, and each bridge arm comprises 2 switching tubes connected in series;
the first input end and the second input end of each switching circuit 10 are used as two direct current input ends to input a path of direct current; the first output end of each switch circuit 10 is connected with the first end of the primary winding of the corresponding transformer 20 in a one-to-one manner, and the second output end of each switch circuit 10 is connected with the second end of the primary winding of the corresponding transformer 20 in a one-to-one manner;
the second end of the jth secondary winding of the ith transformer 20 is connected with the first end of the jth secondary winding of the (i + 1) th transformer 20, the first end of the jth secondary winding of the 1 st transformer 20 is connected with the first input end of the jth rectifying circuit 30, and the second end of the jth secondary winding of the mth transformer 20 is connected with the second input end of the jth rectifying circuit 30; i is a positive integer less than or equal to m-1, j is a positive integer less than or equal to n;
the second output end of the kth rectifying circuit 30 is connected with the first output end of the (k + 1) th rectifying circuit 30 through a corresponding first controllable switch 40, the first output end of the (k + 1) th rectifying circuit 30 is connected with the first output end of the 1 st rectifying circuit 30 through a corresponding second controllable switch 50, and the second output end of the (k + 1) th rectifying circuit 30 is connected with the second output end of the 1 st rectifying circuit 30 through a corresponding second controllable switch 50; k is a positive integer less than or equal to n-1.
It is understood that each of the switch circuits 10 in this embodiment can convert a direct current input from the respective first input terminal and second input terminal into a corresponding alternating current and output the alternating current to the primary winding of the transformer 20 connected to the respective first output terminal and second output terminal, that is, each of the switch circuits 10 corresponds to a different transformer 20 and is connected to the primary winding of the transformer 20 corresponding thereto.
Specifically, the specific way of one path of direct current input by each switch circuit 10 in this embodiment, that is, the connection relationship between the first input terminal and the second input terminal of m switch circuits 10, may be set by a designer according to a practical scenario and a user requirement, for example, each switch circuit 10 may input one path of different direct current corresponding to each other, that is, the first input terminal and the second input terminal of each switch circuit 10 are not connected to the first input terminal and the second input terminal of other switch circuits 10, and are only connected to two ends of one power supply corresponding to each other. For example, the primary winding in the DC/DC converter circuit provided in this embodiment adopts a series connection form, that is, the second input terminal of the ith switch circuit 10 may be connected to the first input terminal of the (i + 1) th switch circuit 10, and the first terminal of the 1 st switch circuit 10 and the second terminal of the mth switch circuit 10 may serve as two direct current input terminals to input one path of direct current; in order to meet the requirement of high power level, the primary winding in the DC/DC converter circuit provided in this embodiment may also adopt a parallel connection form, that is, the first input terminal of the ith switch circuit 10 is connected to the first input terminal of the (i + 1) th switch circuit 10, the second input terminal of the ith switch circuit 10 is connected to the second input terminal of the (i + 1) th switch circuit 10, and a common terminal connected to the first input terminals of the m switch circuits 10 and a common terminal connected to the second input terminals of the m switch circuits 10 may serve as two DC input terminals to input a path of DC power. The present embodiment does not set any limit to this.
Correspondingly, in this embodiment, the one-to-one connection manner between the first output terminal and the second output terminal of each switch circuit 10 and the first end and the second end of the primary winding of the corresponding transformer 20 can be set by a designer, for example, the first output terminal and the second output terminal of each switch circuit 10 can be directly connected to the first end and the second end of the primary winding of the corresponding transformer 20 one-to-one, that is, the first output terminal of the ith switch circuit 10 is connected to the first end of the primary winding of the ith transformer 20, and the second output terminal of the ith switch circuit 10 is connected to the second end of the primary winding of the ith transformer 20; as shown in fig. 2, the first output terminal of each switch circuit 10 may also be connected to the first terminal of the primary winding of a corresponding transformer 20 through a corresponding inductor (L1 or L2) to filter the output of the switch circuit 10, that is, the DC/DC converter circuit provided in this embodiment may further include m inductors, and the first output terminal of the ith switch circuit 10 is connected to the first terminal of the primary winding of the ith transformer 20 through the ith inductor; as shown in fig. 2, the second output terminal of each switch circuit 10 can also be connected to the second terminal of the primary winding of a corresponding one of the transformers 20 one-to-one through a corresponding capacitor (C1 or C2, i.e., a first capacitor) to filter the output of the switch circuit 10, i.e., the DC/DC converter circuit provided by this embodiment can also include m first capacitors, and the second output terminal of the ith switch circuit 10 is connected to the second terminal of the primary winding of the ith transformer 20 through the ith first capacitor. The present embodiment is not limited to this, as long as each of the switching circuits 10 can convert the respective input dc power into the corresponding ac power and output the ac power to the primary winding of the respective connected transformer 20.
It should be noted that the m switching circuits 10 in the present embodiment may be a full bridge circuit including two bridge arms or a half bridge circuit including one bridge arm, such as a full bridge circuit or a half bridge circuit formed by only connecting switching tubes. As shown in fig. 1, when m is 2, each switch circuit 10 may be a full bridge circuit composed of 4 switch tubes (Q1-Q4 or Q5-Q8), that is, each switch circuit 10 includes one bridge arm composed of a first switch tube (Q1 or Q5) and a fourth switch tube (Q4 or Q8) connected in series, and another bridge arm composed of a second switch tube (Q2 or Q6) and a third switch tube (Q3 or Q7); that is, each of the switching circuits 10 may include: the first switching tube, the second switching tube, the third switching tube and the fourth switching tube; the first end of the first switch tube is connected with the first end of the second switch tube, and the common end of the first switch tube can be used as the first input end of the switch circuit 10 and used for being connected with the second input end of the switch circuit 10 respectively with the positive pole and the negative pole of the direct-current power supply to input one path of direct current; the second end of the second switching tube is connected with the first end of the third switching tube, and the common end of the second switching tube can be used as the second output end of the switching circuit 10 to be connected with the second end of the primary winding of the corresponding transformer 20; the second end of the first switching tube is connected with the first end of the fourth switching tube, and the common end of the first switching tube can be used as the first output end of the switching circuit 10 to be connected with the first end of the primary winding of a corresponding transformer 20; a second terminal of the third switching tube is connected to a second terminal of the fourth switching tube, and a common terminal thereof may serve as a second input terminal of the switching circuit 10.
Correspondingly, each switch circuit 10 may also be a half-bridge circuit formed by two switch tubes, that is, each switch circuit 10 includes a bridge arm formed by a fifth switch tube and a sixth switch tube connected in series. Each switching circuit 10 may include: a fifth switching tube and a sixth switching tube; the first end of the fifth switching tube is used as the first input end of the switching circuit 10, the second end of the fifth switching tube and the first end of the sixth switching tube are connected, and the common end of the fifth switching tube and the first end of the sixth switching tube is used as the first output end of the switching circuit 10, and the second end of the sixth switching tube is used as the second output end and the second input end of the switching circuit 10. Further, as shown in fig. 3, each switch circuit 10 may further include 2 diodes (i.e., a third diode and a fourth diode) and 2 capacitors (i.e., a second capacitor and a third capacitor), a cathode of the third diode (D9 or D11) and a first end of the second capacitor (C3 or C5) are connected to a first end of the fifth switch tube (Q1 or Q3) to have a common terminal thereof connected as a first input terminal of the switch circuit 10, an anode of the third diode is connected to a cathode of the fourth diode (D10 or D12), a second end of the second capacitor is connected to a first end of the third capacitor (C4 or C6), an anode of the fourth diode and a second end of the third capacitor are connected to a second end of the sixth switch tube (Q2 or Q4) to have a common terminal thereof connected as a second input terminal of the switch circuit 10, and a cathode of the fourth diode is connected to the first end of the third capacitor as a second output terminal of the switch circuit 10.
Correspondingly, for the specific type of the switching tube in the switching circuit 10 in this embodiment, the specific type may be set by a designer according to a practical scenario and a user requirement, for example, the specific type may be an MOS tube, such as the PMOS tube shown in fig. 1 to 3; other switching tubes such as a triode and an IGBT tube may also be used, and this embodiment does not limit this.
Similarly, the specific setting of the driving pulse output end to which the control end of the switching tube (e.g. the gate of the MOS tube) in the switching circuit 10 in this embodiment is connected, that is, the specific driving control manner of the switching tube, may be set by a designer, for example, PWM driving control may be adopted. The present embodiment does not set any limit to this.
It can be understood that the present embodiment may be directed to make the j-th secondary windings of the m transformers 20 output in series to the j-th rectification circuit 30 by the arrangement that the second end of the j-th secondary winding of the i-th transformer 20 in the DC/DC converter circuit is connected to the first end of the j-th secondary winding of the i + 1-th transformer 20, the first end of the j-th secondary winding of the 1-th transformer 20 is connected to the first input end of the j-th rectification circuit 30, and the second end of the j-th secondary winding of the m-th transformer 20 is connected to the second input end of the j-th rectification circuit 30, so that the DC voltages output by the n rectification circuits 30 are the same when the n-th secondary windings of each transformer 20 have the same specification (e.g. turns ratio).
Correspondingly, in the embodiment, through the arrangement of the n-1 first controllable switches 40 and the 2n-2 second controllable switches 50, the series connection and the parallel connection of the output of the DC/DC converter circuit can be controlled through the switching conduction of the first controllable switches 40 and the second controllable switches 50In the form that when the first controllable switch 40 is closed and the second controllable switch 50 is open, the circuit outputs in series; when the first controllable switch 40 is open and the second controllable switch 50 is closed, the DC/DC converter circuits are output in parallel; since the dc voltages output by the n rectifying circuits 30 are the same, for example, V, when the n secondary windings of each transformer 20 have the same specification (e.g., turns ratio), the dc voltage (V) output by the circuit is when the first controllable switch 40 is turned off and the second controllable switch 50 is turned onout) The direct current voltage is equal to the direct current voltage output by the n rectifying circuits 30, if the direct current voltage can be V, the power of each rectifying circuit 30 output can be automatically equalized, and the output voltage range of the DC/DC converter circuit is widened; when the first controllable switch 40 is closed and the second controllable switch 50 is open, the circuit outputs a direct voltage (V)out) The sum of the direct-current voltages output by the n-path rectifying circuit 30, which may be nV, widens the output voltage range of the DC/DC converter circuit, and the DC/DC converter circuit still has the function of automatically equalizing power when outputting a no-load or light-load state.
Specifically, as shown in fig. 2, when m and n are both 2, if the DC/DC converter circuits are output in parallel, that is, 1 first controllable switch 40(S1) is open and 2 second controllable switches 50(S2 and S3) are closed, the output voltage V of the DC/DC converter circuits isout＝Vout1＝Vout2. The turn ratio and inductance of the upper and lower transformers 20(T1 and T2) are consistent, but the parasitic parameters of the devices and circuits are discrete, and the parameters of the upper and lower circuits are not completely consistent, so that the voltage (V) generated by the secondary windings of the two transformers 20 is not uniformT1And VT2) Voltage (V) on the two secondary windings of the same transformer 20, not being exactly equal but being not identicalT1_1And VT1_2Or VT2_1And VT2_2) Are identical, VT1≠VT2But V isT1_1＝VT1_2And V isT2_1＝VT2_2(ii) a Let the voltage on the two secondary windings of transformer T1 be A, VT1_1＝VT1_2Let the voltage on the two secondary windings of transformer T2 be B, i.e. VT2_1＝VT2_2B; because the secondary windings of the upper and lower paths pass through a full-wave rectifier bridge(i.e. the rectifying circuit 30), the full-wave rectifier bridge may not be considered in the analysis, and at this time, no matter how the circuit load changes and whether the circuit parameters are different, the output voltages of the upper and lower paths are: vout1＝Vout2＝A+B＝Vout. Accordingly, the output current of the DC/DC converter circuit can be analyzed in a manner similar to the above-described analysis. From the above analysis, when the DC/DC converter circuit provided in this embodiment is output in a parallel connection manner, the upper and lower paths can automatically equalize power, and the output voltage range of the circuit is also widened.
If the DC/DC converter circuit is output in series, i.e. 1 first controllable switch 40(S1) is closed and 2 second controllable switches 50(S2 and S3) are open, as shown in fig. 2, the output voltage V of the DC/DC converter circuit isout＝Vout1+Vout2. Let the voltage on the two secondary windings of transformer T1 be A, VT1_1＝VT1_2Let the voltage on the two secondary windings of transformer T2 be B, i.e. VT2_1＝VT2_2B; at this time, no matter how the circuit load changes and whether the circuit parameters are different, the output voltages of the upper and lower paths are respectively: vout1＝Vout2＝A+B，Vout＝2×Vout1＝2×Vout2. When the DC/DC converter circuit provided by the embodiment is output in a series connection mode, the output voltage range of the circuit is further widened, and the circuit still has the function of automatically equalizing power when the circuit outputs a no-load or light-load state.
In summary, the DC/DC converter circuit provided in this embodiment, no matter the output is in a series connection form or a parallel connection form, no matter how the circuit load changes and whether the circuit parameters are different, can achieve power balance of the circuit without increasing the uniform power control circuit, and improve the reliability of the circuit; meanwhile, the output voltage range of the circuit can be widened.
It should be noted that, for the specific circuit structure of each rectifier circuit 30 in this step, it can be set by the designer according to the practical situation and the user's requirement, for example, each rectifier circuit 30 can be a full-wave rectifier bridge circuit including four diodes (i.e. a first diode, a second diode, a third diode and a fourth diode), as shown in fig. 1, the cathode of the first diode (D1 or D5) and the anode of the second diode (D2 or D6) are connected, and the common end thereof is connected as the first input end of the rectifier circuit 30 and the first end of a secondary winding corresponding to the 1 st transformer 20(T1), the cathode of the second diode and the cathode of the third diode (D3 or D7) are connected, and the common end thereof is connected as the first output end of the rectifier circuit 30, and the anode of the third diode and the cathode of the fourth diode (D4 or D8) are connected, and the common end thereof is connected as the second input end of the rectifier circuit 30 and the first output end of a secondary winding corresponding to the 1 st transformer 20(T1) The two terminals are connected, and the anode of the fourth diode and the anode of the first diode are connected with the common terminal thereof as the second output terminal of the rectifying circuit 30. The rectifier circuits 30 may also have other circuit structures, as long as each rectifier circuit 30 can convert the alternating current received by the two input ends (i.e., the first input end and the second input end) into corresponding direct current and output the direct current through the two output ends (i.e., the first output end and the second input end) (i.e., the first input end and the second input end), which is not limited in this embodiment.
In the embodiment of the present invention, the output of the circuit in a wide voltage range is realized by connecting the secondary windings of the m transformers 20 in series; the series and parallel connection of the circuit output is controlled by switching the first controllable switch 40 and the second controllable switch 50, and by utilizing a simple and reliable circuit structure, no matter the circuit output is in the series connection or the parallel connection, the power balance of the circuit can be realized under the condition of not increasing the uniform power control circuit, so that the cost is reduced.
In addition, an embodiment of the present invention further provides a DC/DC converter, including: the DC/DC converter circuit as provided in the above embodiments.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the DC/DC converter disclosed in the embodiment, since it corresponds to the DC/DC converter circuit disclosed in the embodiment, the description is relatively simple, and for the relevant points, refer to the description of the circuit part.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, 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, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The DC/DC converter circuit and the DC/DC converter according to the present invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (10)

1. A DC/DC converter circuit, comprising: m switching circuits, m transformers, n rectifying circuits, n-1 first controllable switches and 2n-2 second controllable switches; each transformer comprises m secondary windings, m and n are positive integers greater than or equal to 2, each switching circuit comprises at least one bridge arm, and each bridge arm comprises 2 switching tubes connected in series;
the first input end and the second input end of each switch circuit are used as two direct current input ends to input direct current; the first output end of each switch circuit is connected with the first end of the primary winding of the corresponding transformer in a one-to-one manner, and the second output end of each switch circuit is connected with the second end of the primary winding of the corresponding transformer in a one-to-one manner;
the second end of the jth secondary winding of the ith transformer is connected with the first end of the jth secondary winding of the (i + 1) th transformer, the first end of the jth secondary winding of the 1 st transformer is connected with the first input end of the jth rectifying circuit, and the second end of the jth secondary winding of the mth transformer is connected with the second input end of the jth rectifying circuit; i is a positive integer less than or equal to m-1, j is a positive integer less than or equal to n;
the second output end of the kth rectifying circuit is connected with the first output end of the (k + 1) th rectifying circuit through a corresponding first controllable switch, the first output end of the (k + 1) th rectifying circuit is connected with the first output end of the 1 st rectifying circuit through a corresponding second controllable switch, and the second output end of the (k + 1) th rectifying circuit is connected with the second output end of the 1 st rectifying circuit through a corresponding second controllable switch; k is a positive integer less than or equal to n-1.
2. A DC/DC converter circuit as claimed in claim 1, characterized in that the first input of the i-th switching circuit is connected to the first input of the i + 1-th switching circuit and the second input of the i-th switching circuit is connected to the second input of the i + 1-th switching circuit.
3. The DC/DC converter circuit of claim 1, further comprising m inductors and m first capacitors;
the first output end of each switching circuit is connected with the first end of the primary winding of the corresponding transformer in a one-to-one manner through the corresponding inductor, and the second output end of each switching circuit is connected with the second end of the primary winding of the corresponding transformer in a one-to-one manner through the corresponding first capacitor.
4. The DC/DC converter circuit according to claim 1, wherein when the rectifying circuit is a full-wave rectifier bridge circuit, the rectifying circuit comprises: a first diode, a second diode, a third diode and a fourth diode;
the cathode of the first diode and the anode of the second diode are connected, the common end of the cathode of the second diode and the cathode of the third diode is connected, the first output end of the rectification circuit is used as the first output end of the rectification circuit, the common end of the anode of the third diode and the cathode of the fourth diode is connected, the second input end of the rectification circuit is used as the second input end of the rectification circuit, and the common end of the anode of the fourth diode and the anode of the first diode is connected, the second output end of the rectification circuit is used as the second output end of the rectification circuit.
5. The DC/DC converter circuit of claim 1, wherein when the switching circuit is a full bridge circuit, the switching circuit comprises: the first switching tube, the second switching tube, the third switching tube and the fourth switching tube;
the first end of the first switch tube and the first end of the second switch tube are connected with the common end of the first switch tube to serve as the first input end of the switch circuit, the second end of the second switch tube and the first end of the third switch tube are connected with the common end of the third switch tube to serve as the second output end of the switch circuit, the second end of the first switch tube and the first end of the fourth switch tube are connected with the common end of the first switch tube to serve as the first output end of the switch circuit, and the second end of the third switch tube and the second end of the fourth switch tube are connected with the common end of the fourth switch tube to serve as the second input end of the switch circuit.
6. The converter circuit of claim 1, wherein when the switching circuit is a half-bridge circuit, the switching circuit comprises: a fifth switching tube and a sixth switching tube;
the first end of the fifth switching tube is used as the first input end of the switching circuit, the common end of the second end of the fifth switching tube and the first end of the sixth switching tube is connected and used as the first output end of the switching circuit, and the second end of the sixth switching tube is used as the second output end and the second input end of the switching circuit.
7. The converter circuit of claim 5, wherein the switching circuit further comprises: a third diode, a fourth diode, a second capacitor, and a third capacitor;
the cathode of the third diode and the first end of the second capacitor are connected with the first end of the fifth switching tube, the common end of the third diode and the first end of the second capacitor is used as the first input end of the switching circuit, the anode of the third diode is connected with the cathode of the fourth diode, the second end of the second capacitor is connected with the first end of the third capacitor, the anode of the fourth diode and the second end of the third capacitor are connected with the second end of the sixth switching tube, the common end of the fourth diode and the first end of the third capacitor is used as the second input end of the switching circuit, and the common end of the cathode of the fourth diode and the first end of the third capacitor is connected with the second output end of the switching circuit.
8. The converter circuit of claim 1, wherein m and n are both 2.
9. The converter circuit according to claim 1, wherein 2 of said switching transistors included in each of said bridge legs are each a PMOS transistor.
10. A DC/DC converter, comprising:
a DC/DC converter circuit as claimed in any one of claims 1 to 9.
CN202010100259.9A 2020-02-18 2020-02-18 DC/DC converter circuit and DC/DC converter Pending CN111384860A (en)

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CN113271029A (en) * 2021-05-28 2021-08-17 青岛大学 DAB type single-stage bidirectional AC/DC converter with low voltage stress and wide output range
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CN113841316A (en) * 2021-02-05 2021-12-24 华为数字能源技术有限公司 Charging circuit and charging device
CN113271029A (en) * 2021-05-28 2021-08-17 青岛大学 DAB type single-stage bidirectional AC/DC converter with low voltage stress and wide output range
CN113809931A (en) * 2021-11-19 2021-12-17 深圳市能效电气技术有限公司 DC-DC conversion circuit
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CN116581975A (en) * 2023-07-12 2023-08-11 深圳达德航空科技有限公司 Switching power supply circuit

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