Voltage conversion circuit and vehicle-mounted power supply

Abstract

The utility model discloses a voltage conversion circuit and a vehicle-mounted power supply, and relates to the technical field of electronic circuits. The voltage conversion circuit comprises a controller, a first conversion branch and a second conversion branch. The first conversion branch converts an alternating current power supply into a first direct current power supply; the first conversion branch comprises a rectification module, a signal output module, a transformer and a rectification wave-emitting module which are connected in sequence; the rectification module rectifies an AC power supply and then inputs the rectified AC power supply to the signal output module, so that the signal output module outputs a high-frequency signal to the transformer, and the rectification wave-emitting module rectifies the signal output by the transformer and then outputs a first DC power supply. The second conversion branch comprises a first winding; the first winding is coupled to a magnetic core of the transformer, so that the combination of the rectification wave-generating module and the second conversion branch converts the first direct-current power supply into a second direct-current power supply; the rectification wave-emitting module outputs a high-frequency signal to the transformer based on the first DC power supply. Through the mode, a common switch can be adopted to realize a voltage conversion function, and the cost is relatively low.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of electronic circuits, and in particular to a voltage conversion circuit and a vehicle-mounted power supply. Background Art

[0002] At present, two-in-one vehicle power supplies usually include OBC (on-board charger) and DCDC (direct current converter). Among them, OBC, as a key component connecting the charging pile and the new energy vehicle, converts AC power into the high-voltage DC power required by the power battery, providing power for the new energy vehicle from the source. DCDC converts the high-voltage DC power of the power battery into low-voltage DC power, providing energy for low-voltage vehicle equipment, and is the guarantee of the intelligence of new energy vehicles.

[0003] However, in the existing two-in-one vehicle power supply, each switching device needs to realize multiple functions at the same time, which results in each switching device needing to use a high-speed switch, which is costly and has a complex control scheme. Utility Model Content

[0004] The embodiments of the present application provide a voltage conversion circuit and a vehicle-mounted power supply, which enable some switching devices to use ordinary switches, have low costs, and simplify the control scheme.

[0005] In a first aspect, an embodiment of the present application provides a voltage conversion circuit, including:

[0006] Controller;

[0007] A first conversion branch, connected to the controller and inputting an AC power source, and configured to be controlled by the controller to convert the AC power source into a first DC power source;

[0008] The first conversion branch includes a rectifier module, a signal output module, a transformer and a rectifier wave generator module which are connected in sequence, and the rectifier module, the signal output module and the rectifier wave generator module are all controlled by the controller;

[0009] The rectifying module rectifies the AC power supply and then inputs it into the signal output module, so that the signal output module outputs a high-frequency signal to the transformer, and the rectifying and emitting module rectifies the signal output by the transformer and then outputs the first DC power supply;

[0010] A second conversion branch is connected to the controller, the second conversion branch includes a first winding, and the first winding is coupled to the magnetic core of the transformer, so that the combination of the rectifying and waving module and the second conversion branch is controlled by the controller to convert the first DC power supply into a second DC power supply, wherein the rectifying and waving module also outputs a high-frequency signal to the transformer based on the first DC power supply.

[0011] In one or more embodiments, the first conversion branch further includes:

[0012] The filter module is connected between the AC power supply and the rectifier module, and is configured to filter the AC power supply and then input the filtered AC power to the rectifier module.

[0013] In one or more embodiments, the filtering module includes a first capacitor, a first inductor and a second capacitor;

[0014] The first end of the first capacitor is connected to the first end of the AC power supply and the first end of the first inductor respectively, the second end of the first capacitor is connected to the second end of the AC power supply, the second end of the first inductor is connected to the first end of the second capacitor and the first end of the rectifier module respectively, and the second end of the second capacitor is connected to the second end of the AC power supply and the second end of the rectifier module.

[0015] In one or more embodiments, the rectifier module includes a first switch, a second switch, a third switch and a fourth switch;

[0016] The first switch and the second switch are connected in series between the first end and the second end of the signal output module, and the connection point between the first switch and the second switch is connected to the first end of the AC power supply;

[0017] The third switch and the fourth switch are connected in series between the first end and the second end of the signal output module, and the connection point between the third switch and the fourth switch is connected to the second end of the AC power supply;

[0018] Control ends of the first switch, the second switch, the third switch and the fourth switch are all connected to the controller.

[0019] In one or more embodiments, the controller is further configured to:

[0020] In a first time period of a working cycle, the second switch and the third switch are controlled to be turned on, and other switches are controlled to be turned off;

[0021] In a second time period of a working cycle, the first switch and the fourth switch are controlled to be turned on, and the other switches are controlled to be turned off;

[0022] Wherein, the working cycle of the rectifier module is the same as the working cycle of the AC power supply.

[0023] In one or more embodiments, the signal output module includes a fifth switch, a sixth switch, a seventh switch, and an eighth switch, and the transformer includes a second winding;

[0024] The fifth switch and the sixth switch are connected in series between the first end and the second end of the rectifier module, and the connection point between the fifth switch and the sixth switch is connected to the second end of the second winding;

[0025] The seventh switch and the eighth switch are connected in series between the first end and the second end of the rectifier module, and the connection point between the seventh switch and the eighth switch is connected to the first end of the second winding;

[0026] Control ends of the fifth switch, the sixth switch, the seventh switch and the eighth switch are all connected to the controller.

[0027] In one or more embodiments, the rectifying and waving module includes a ninth switch, a tenth switch, an eleventh switch and a twelfth switch, and the transformer includes a third winding;

[0028] The ninth switch is connected in series with the tenth switch, and a connection point between the ninth switch and the tenth switch is connected to a first end of the third winding; the eleventh switch is connected in series with the twelfth switch, and a connection point between the eleventh switch and the twelfth switch is connected to a second end of the third winding;

[0029] One end of the combination of the ninth switch and the tenth switch connected in series and the combination of the eleventh switch and the twelfth switch connected in series in parallel is the first end of the first DC power supply, and the other end is the second end of the first DC power supply;

[0030] Control ends of the ninth switch, the tenth switch, the eleventh switch, and the twelfth switch are all connected to the controller.

[0031] In one or more embodiments, the first conversion branch further includes a second inductor, a third capacitor and a fourth capacitor;

[0032] The second inductor is connected between a connection point between the seventh switch and the eighth switch and the second end of the second winding, a combination of the fifth switch and the sixth switch in series is connected in parallel with the third capacitor, and a combination of the ninth switch and the tenth switch in series is connected in parallel with the fourth capacitor.

[0033] In one or more embodiments, the second conversion branch includes a thirteenth switch, a fourteenth switch, a fifteenth switch, a sixteenth switch, a third inductor, a fourth inductor and a fifth capacitor;

[0034] One end of the combination of the fourteenth switch and the fifteenth switch connected in series is connected to the second end of the first winding, and the other end is connected to one end of the combination of the thirteenth switch and the sixteenth switch connected in series and the first end of the fifth capacitor, and serves as the second end of the second DC power supply, the other end of the combination of the thirteenth switch and the sixteenth switch connected in series is connected to the first end of the first winding, the connection point between the fourteenth switch and the fifteenth switch is connected to the first end of the fourth inductor, the connection point between the thirteenth switch and the sixteenth switch is connected to the first end of the third inductor, the second end of the third inductor is respectively connected to the second end of the fourth inductor and the second end of the fifth capacitor, and serves as the first end of the second DC power supply;

[0035] Control ends of the thirteenth switch, the fourteenth switch, the fifteenth switch, and the sixteenth switch are all connected to the controller.

[0036] In one or more embodiments, the controller is further configured to:

[0037] In a first time period of a working cycle, the sixth switch, the seventh switch, the ninth switch, the twelfth switch, the thirteenth switch, the fourteenth switch and the fifteenth switch are controlled to be turned on, and the other switches are controlled to be turned off;

[0038] In a second time period of a working cycle, the sixth switch, the seventh switch, the tenth switch, the twelfth switch, the thirteenth switch, the fourteenth switch, the fifteenth switch and the sixteenth switch are controlled to be turned on, and the other switches are controlled to be turned off;

[0039] In a third time period of a working cycle, the sixth switch, the seventh switch, the tenth switch, the eleventh switch, the thirteenth switch and the sixteenth switch are controlled to be turned on, and the other switches are controlled to be turned off;

[0040] In a fourth time period of a working cycle, the sixth switch, the seventh switch, the tenth switch, the eleventh switch, the thirteenth switch, the fourteenth switch and the sixteenth switch are controlled to be turned on, and the other switches are controlled to be turned off;

[0041] In a fifth time period of a working cycle, the fifth switch, the eighth switch, the tenth switch, the eleventh switch, the thirteenth switch, the fourteenth switch and the sixteenth switch are controlled to be turned on, and the other switches are controlled to be turned off;

[0042] In a sixth time period of a working cycle, the fifth switch, the eighth switch, the ninth switch, the eleventh switch, the thirteenth switch, the fourteenth switch, the fifteenth switch and the sixteenth switch are controlled to be turned on, and the other switches are controlled to be turned off;

[0043] In a seventh time period of a working cycle, the fifth switch, the eighth switch, the ninth switch, the twelfth switch, the fourteenth switch and the fifteenth switch are controlled to be turned on, and the other switches are controlled to be turned off;

[0044] In an eighth time period of a working cycle, the fifth switch, the eighth switch, the ninth switch, the twelfth switch, the thirteenth switch, the fourteenth switch and the fifteenth switch are controlled to be turned on, and the other switches are controlled to be turned off;

[0045] The signal output module, the rectifying and waving module and the second conversion branch have the same working cycle, but are different from the working cycle of the AC power supply.

[0046] In a second aspect, an embodiment of the present application provides a vehicle-mounted power supply, comprising the voltage conversion circuit as described above.

[0047] The beneficial effect of the present application is as follows: the voltage conversion circuit of the embodiment of the present application includes a controller, a first conversion branch and a second conversion branch. The first conversion branch is connected to the controller and inputs an AC power supply, and is configured to be controlled by the controller to convert the AC power supply into a first DC power supply. The first conversion branch includes a rectifier module, a signal output module, a transformer and a rectifier wave generator module connected in sequence, and the rectifier module, the signal output module and the rectifier wave generator module are all controlled by the controller. The rectifier module rectifies the AC power supply and inputs it into the signal output module, so that the signal output module outputs a high-frequency signal to the transformer, and the rectifier wave generator module rectifies the signal output by the transformer and outputs the first DC power supply. The second conversion branch is connected to the controller, and the second conversion branch includes a first winding, and the first winding is coupled to the magnetic core of the transformer, so that the combination of the rectifier wave generator module and the second conversion branch is controlled by the controller to convert the first DC power supply into a second DC power supply, wherein the rectifier wave generator module also outputs a high-frequency signal to the transformer based on the first DC power supply. By adopting the above method, the functions of rectifying and outputting high-frequency signals can be realized by different modules, and then the switch device in the rectifying module only needs to be an ordinary switch, which is conducive to reducing costs. Secondly, since the functions of rectifying and outputting high-frequency signals are realized separately, it is conducive to simplifying the control scheme and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] One or more embodiments are exemplarily described by the figures in the corresponding drawings, and these exemplary descriptions are not intended to limit the embodiments. Elements with the same reference numerals in the drawings represent similar elements.

[0049] Figure 1 The structure of the voltage conversion circuit provided in the embodiment of the present application is shown in FIG. Figure 1 ;

[0050] Figure 2 The structure of the voltage conversion circuit provided in the embodiment of the present application is shown in FIG. Figure 2 ;

[0051] Figure 3 is with Figure 2 A schematic diagram of a circuit structure corresponding to the structure shown;

[0052] Figure 4 yes Figure 3 A schematic diagram of control signals of each switch in the rectifier module shown;

[0053] Figure 5 yes Figure 3 The schematic diagram of the control signals of the signal output module, the rectifier and generator module and each switch in the second conversion branch is shown. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and in detail in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0055] It should be noted that, when an element is described as being “connected to” another element, it may be directly connected to the other element, or one or more intervening elements may exist therebetween.

[0056] In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as there is no structural conflict between them.

[0057] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of the voltage conversion circuit provided in the embodiment of the present application. Figure 1 As shown, the voltage conversion circuit 100 includes a first conversion branch 10 , a second conversion branch 20 and a controller 30 .

[0058] The controller 30 may be a microcontroller unit (MCU) or a digital signal processing (DSP) controller, etc. The controller 30 can output signals for controlling the switches in the first conversion branch 10 and the second conversion branch 20 to drive the switches in the first conversion branch 10 and the second conversion branch 20 to turn on or off.

[0059] The first conversion branch 10 is connected to the controller 30. The first conversion branch 10 inputs the AC power VAC. The first conversion branch 10 is configured to be controlled by the controller 30 to convert the AC power VAC into a first DC power VD1.

[0060] The first conversion branch 10 includes a rectifier module 11, a signal output module 12, a transformer T1 and a rectifier wave generator module 13 connected in sequence. The rectifier module 11, the signal output module 12 and the rectifier wave generator module 13 are all controlled by the controller 30. Specifically, after the AC power VAC is input to the rectifier module 11, the rectifier module 11 rectifies the AC power VAC and inputs the rectified signal to the signal output module 12. Then, the signal output module 12 outputs a high-frequency signal to the transformer T1 to drive the transformer T1 to operate. Finally, the signal output by the transformer T1 is rectified by the rectifier wave generator module 13 and converted into the first DC power VD1.

[0061] The second conversion branch 20 is connected to the controller 30. The second conversion branch 20 includes a first winding L1, which is coupled to the magnetic core of the transformer T1, so that the combination of the rectifier and oscillator module 13 and the second conversion branch 20 is controlled by the controller 30 to convert the first DC power source VD1 into the second DC power source VD2. Specifically, after the first DC power source VD1 is input to the rectifier and oscillator module 13, the rectifier and oscillator module 13 outputs a high-frequency signal to the transformer T1 based on the first DC power source VD1 to drive the transformer T1 to operate. Afterwards, the second conversion branch 20 converts the voltage output by the transformer T1 into the second DC power source VD2.

[0062] In the related art, the circuit structure on the left side of the transformer T1 is usually implemented by one module. At this time, each switch device in the circuit structure on the left side of the transformer T1 needs to realize multiple functions at the same time, including the function of outputting high-frequency signals, so each switch device needs to use a high-speed switch, which is costly. In the embodiment of the present application, it is respectively separated into a rectifier module 11 and a signal output module 12 to realize different functions, and then each switch device in the rectifier module 11 only needs to use an ordinary switch, which is less costly than a high-speed switch.

[0063] Secondly, in the related art, since each switch device needs to realize multiple functions, it is necessary to consider the compatibility between the functions when controlling each switch device, which makes the control scheme more complicated. In the embodiment of the present application, since each function is realized separately, it is only necessary to consider the realization of each function separately, which can simplify the control scheme.

[0064] Furthermore, by coupling the first winding L1 to the magnetic core of the transformer T1, the first DC power source VD1 can be converted into the second DC power source VD2 by using the combination of the rectifying and waving module 13 and the second conversion branch 20. Through the above process, the process of converting the AC power source VAC into the first DC current VD1 and converting the first DC power source VD1 into the second DC power source VD2 through the first-level power conversion is realized. At the same time, the multiplexing of the rectifying and waving module 13 is also realized, that is, the rectifying and waving module 13 plays a role in the process of converting the AC power source VAC into the first DC current VD1, and also plays a role in the process of converting the first DC power source VD1 into the second DC power source VD2, which is conducive to reducing the volume and reducing the cost.

[0065] In one embodiment of the present application, Figure 2 As shown, the first conversion branch 10 further includes a filtering module 14 .

[0066] The filter module 14 is connected between the AC power supply VAC and the rectifier module 11. The filter module 14 is configured to filter the AC power supply VAC and then input it to the rectifier module 11. The filter module 14 is used to filter out ripples in the AC power supply VAC.

[0067] Please refer to Figure 3 , Figure 3 The embodiments of the present application provide Figure 2 A circuit structure corresponding to the structure shown in FIG. Figure 3 As shown, the filter module 14 includes a first capacitor C1 , a first inductor LA1 and a second capacitor C2 .

[0068] Among them, the first end of the first capacitor C1 is respectively connected to the first end of the AC power supply VAC and the first end of the first inductor LA1, the second end of the first capacitor C1 is connected to the second end of the AC power supply VAC, the second end of the first inductor LA1 is respectively connected to the first end of the second capacitor C2 and the first end of the rectifier module 11, and the second end of the second capacitor C2 is connected to the second end of the AC power supply VAC and the second end of the rectifier module 11.

[0069] Specifically, the first capacitor C1, the first inductor LA1 and the second capacitor C2 form a π-type filter circuit.

[0070] In this embodiment, the rectifier module 11 includes a first switch K1 , a second switch K2 , a third switch K3 and a fourth switch K4 .

[0071] The first switch K1 and the second switch K2 are connected in series between the first end and the second end of the signal output module 12, and the connection point between the first switch K1 and the second switch K2 is connected to the first end of the AC power supply VAC. The third switch K3 and the fourth switch K4 are connected in series between the first end and the second end of the signal output module 12, and the connection point between the third switch K3 and the fourth switch K4 is connected to the second end of the AC power supply VAC. The control ends of the first switch K1, the second switch K2, the third switch K3 and the fourth switch K4 are all connected to the controller 30 (not shown).

[0072] It should be noted that, in the embodiments of the present application, each switch (such as the first switch K1) can be any controllable switch, such as an insulated gate bipolar transistor (IGBT) device, an integrated gate-commutated thyristor (IGCT) device, a gate-turn-off thyristor (GTO) device, a silicon-controlled rectifier (SCR) device, a junction-gate field-effect transistor (JFET) device, a MOS-controlled thyristor (MCT) device, etc.

[0073] Taking the first switch K1 as a MOS tube as an example, the control end of the first switch K1 is the gate of the MOS tube, and the other two ends of the first switch K1 are the source and the drain respectively.

[0074] In this embodiment, the signal output module includes a fifth switch K5, a sixth switch K6, a seventh switch K7 and an eighth switch K8, and the transformer T1 includes a second winding L2.

[0075] The fifth switch K5 and the sixth switch K6 are connected in series between the first end and the second end of the rectifier module 12, and the connection point between the fifth switch K5 and the sixth switch K6 is connected to the second end of the second winding L2. The seventh switch K7 and the eighth switch K8 are connected in series between the first end and the second end of the rectifier module 12, and the connection point between the seventh switch K7 and the eighth switch K8 is connected to the first end of the second winding L2. The control ends of the fifth switch K5, the sixth switch K6, the seventh switch K7 and the eighth switch K8 are all connected to the controller 30 (not shown).

[0076] In this embodiment, the rectifying and pulsating module 13 includes a ninth switch K9 , a tenth switch K10 , an eleventh switch K11 , and a twelfth switch K12 , and the transformer T1 includes a third winding L3 .

[0077] The ninth switch K9 is connected in series with the tenth switch K10, and the connection point between the ninth switch K9 and the tenth switch K10 is connected to the first end of the third winding L3. The eleventh switch K11 is connected in series with the twelfth switch K12, and the connection point between the eleventh switch K11 and the twelfth switch K12 is connected to the second end of the third winding L3. The combination of the ninth switch K9 and the tenth switch K10 in series and the combination of the eleventh switch K11 and the twelfth switch K12 in series are connected in parallel to form a first end of the first DC power supply VD1, and the other end is a second end of the first DC power supply VD1. The control ends of the ninth switch K9, the tenth switch K10, the eleventh switch K11, and the twelfth switch K12 are all connected to the controller 30 (not shown).

[0078] In this embodiment, the first conversion branch 10 further includes a second inductor LA2 , a third capacitor C3 and a fourth capacitor C4 .

[0079] The second inductor LA2 is connected between the connection point between the seventh switch K7 and the eighth switch K8 and the second end of the second winding L2. The fifth switch K5 and the sixth switch K6 are connected in series and connected in parallel with the third capacitor C3. The ninth switch K9 and the tenth switch K10 are connected in series and connected in parallel with the fourth capacitor C4.

[0080] Specifically, the second inductor LA2 is used to achieve a voltage boosting function. The third capacitor C3 and the fourth capacitor C4 are both filter capacitors.

[0081] In this embodiment, the second conversion branch 20 includes a thirteenth switch K13, a fourteenth switch K14, a fifteenth switch K15, a sixteenth switch K16, a third inductor LA3, a fourth inductor LA4 and a fifth capacitor C5.

[0082] Among them, one end of the combination of the fourteenth switch K14 and the fifteenth switch K15 connected in series is connected to the second end of the first winding L1, and the other end of the combination of the fourteenth switch K14 and the fifteenth switch K15 connected in series is connected to one end of the combination of the thirteenth switch K13 and the sixteenth switch K16 connected in series and the first end of the fifth capacitor C5. The other end of the combination of the fourteenth switch K14 and the fifteenth switch K15 connected in series also serves as the second end of the second DC power supply. The other end of the combination of the thirteenth switch K13 and the sixteenth switch K16 connected in series is connected to the first end of the first winding L1, the connection point between the fourteenth switch K14 and the fifteenth switch K15 is connected to the first end of the fourth inductor LA4, the connection point between the thirteenth switch K13 and the sixteenth switch K16 is connected to the first end of the third inductor LA3, and the second end of the third inductor LA3 is respectively connected to the second end of the fourth inductor LA4 and the second end of the fifth capacitor C5, and serves as the first end of the second DC power supply VD2. Control ends of the thirteenth switch K13 , the fourteenth switch K14 , the fifteenth switch K15 and the sixteenth switch K16 are all connected to a controller (not shown).

[0083] exist Figure 3 In the embodiment shown, the first switch K1 to the fourth switch K4 can be implemented by ordinary switches without high-speed switches, which is low in cost. In addition, the control of the first switch K1 to the fourth switch K4 and the control of the fifth switch K5 to the eighth switch K8 are independent of each other, which is conducive to simplifying the control scheme.

[0084] Secondly, in this embodiment, the output voltage of the second DC power supply VD2 is adjusted only by the duty cycle of the thirteenth switch K13 and the fourteenth switch K14. Moreover, when the duty cycle of the thirteenth switch K13 and the fourteenth switch K14 is adjusted, the output voltage of the first DC power supply VD1 will not be affected, and the first DC power supply VD1 and the second DC power supply VD2 are power decoupled, which is beneficial to improve the stability and reliability of the voltage conversion circuit 100. On the other hand, when the thirteenth switch K13 and the fourteenth switch K14 are turned off, the connection between the first winding L1 and the second DC power supply VD2 is cut off, and at this time, the first DC power supply VD1 can work alone, and the second DC power supply VD2 can be shut down, which is beneficial to make the voltage conversion circuit 100 suitable for a variety of different application scenarios.

[0085] Furthermore, the controller 30 controls the first switch K1 to the fourth switch K4 and the fifth switch K5 to the twelfth switch K12 to be turned on and off in an orderly manner, which can realize the conversion of the AC power supply VAC into the first DC power supply VD1, and realize the process of power factor correction. At the same time, compared with the solution in the related art that needs to first pass through the non-isolated totem PFC and the isolated DC-DC circuit, this process can improve the power conversion efficiency while reducing the overall volume and cost of the voltage conversion circuit 100. Of course, the controller 30 controls the first switch K1 to the fourth switch K4 and the fifth switch K5 to the twelfth switch K12 to be turned on and off in an orderly manner, which can also realize the conversion of the first DC power supply VD1 into the AC power supply VAC, that is, realize the inversion process.

[0086] Among them, PFC (Power Factor Correction) is a power electronics technology used to improve the power factor of the AC power supply VAC system. It aims to improve energy efficiency by making the input current and input voltage in phase and reducing harmonic distortion, bringing the system's power factor close to the ideal value. A DC-DC circuit is a circuit used to convert the voltage of a DC power supply into different voltage levels.

[0087] At the same time, a first winding L1 is added to increase the output of a DC power supply (i.e., the second DC power supply VD2). The first winding L1 is coupled to the magnetic core of the transformer T1 to achieve the purpose of sharing the magnetic circuit, which can also reduce the overall volume and cost of the voltage conversion circuit 100. It can be understood that in the process of the controller 30 controlling the fifth switch K5 to the twelfth switch K12, the thirteenth switch K13 to the sixteenth switch K16 are also controlled to be turned on and off in an orderly manner to maintain the stable output of the second DC power supply VD2.

[0088] In addition, the controller 30 can also convert the first DC power source VD1 into the second DC power source VD2 without adding a transformer T1 by controlling the combination of the ninth switch K9 to the twelfth switch K12 and the thirteenth switch K13 to the sixteenth switch K16. The reuse of the ninth switch K9 to the twelfth switch K12 is achieved, so that the reuse of the ninth switch K9 to the twelfth switch K12 can be reduced, which is conducive to reducing the overall volume and cost of the voltage conversion circuit 100. Of course, the controller 30 can also convert the second DC power source VD2 into the first DC power source VD1 by controlling the combination of the ninth switch K9 to the twelfth switch K12 and the thirteenth switch K13 to the sixteenth switch K16.

[0089] Please refer to Figure 4 , Figure 4 An example is shown Figure 3Schematic diagram of control signals of switches in the rectifier module 11 shown. The horizontal axis is time. Curve SK1 is the control signal output by the controller 30 to control the first switch K1; curve SK2 is the control signal output by the controller 30 to control the second switch K2; curve SK3 is the control signal output by the controller 30 to control the third switch K3; curve SK4 is the control signal output by the controller 30 to control the fourth switch K4.

[0090] It can be seen that the embodiment of the present application also provides a Figure 3 The control method of the rectifier module 11 shown in the figure. Specifically, the controller 30 is also used to: in a first time period (such as the time period between time t1 and time t2) of a working cycle (such as the time period between time t1 and time t3 as a working cycle), control the second switch K2 and the third switch K3 to be turned on, and control other switches to be turned off. In a second time period (such as the time period between time t2 and time t3) of a working cycle, control the first switch K1 and the fourth switch K4 to be turned on, and control other switches to be turned off. Among them, the working cycle of the rectifier module 11 is the same as the working cycle of the AC power supply VAC.

[0091] Through the above process, the controller 30 controls each switch (including the first switch K1 to the fourth switch K4) to be in a corresponding working state within two time periods of a working cycle to achieve a rectification function.

[0092] Please refer to Figure 5 , Figure 5 An example is shown Figure 3 The control signals of the signal output module 12, the rectifying and emitting module 13 and each switch in the second conversion branch 20 are shown. The horizontal axis is time. Curve SK5 is a control signal output by the controller 30 for controlling the fifth switch K5; curve SK6 is a control signal output by the controller 30 for controlling the sixth switch K6; curve SK7 is a control signal output by the controller 30 for controlling the seventh switch K7; curve SK8 is a control signal output by the controller 30 for controlling the eighth switch K4; curve SK9 is a control signal output by the controller 30 for controlling the ninth switch K9; curve SK10 is a control signal output by the controller 30 for controlling the tenth switch K10; curve SK11 is a control signal output by the controller 30 for controlling the eleventh switch K11; curve SK8 is a control signal output by the controller 30 for controlling the twelfth switch K12; curve SK13 is a control signal output by the controller 30 for controlling the thirteenth switch K13; curve SK14 is a control signal output by the controller 30 for controlling the fourteenth switch K14; curve SK15 is a control signal output by the controller 30 for controlling the fifteenth switch K15; and curve SK16 is a control signal output by the controller 30 for controlling the sixteenth switch K16.

[0093] It can be seen that the embodiment of the present application also provides a Figure 3The control method of the signal output module 12, the rectifying and waving module 13 and the second conversion branch 20 shown in the figure. Specifically, the controller 30 is also used to: in the first time period (such as the time period between t5 and t6) of a working cycle (such as the time period between t5 and t13 as a working cycle), control the sixth switch K6, the seventh switch K7, the ninth switch K9, the twelfth switch K12, the thirteenth switch K13, the fourteenth switch K14 and the fifteenth switch K15 to be turned on, and control other switches to be turned off. In the second time period (such as the time period between t6 and t7) of a working cycle, control the sixth switch K6, the seventh switch K7, the tenth switch K10, the twelfth switch K12, the thirteenth switch K13, the fourteenth switch K14, the fifteenth switch K15 and the sixteenth switch K16 to be turned on, and control other switches to be turned off. In the third time period of a working cycle (for example, the time period between time t7 and time t8), the sixth switch K6, the seventh switch K7, the tenth switch K10, the eleventh switch K11, the thirteenth switch K13 and the sixteenth switch K16 are controlled to be turned on, and the other switches are controlled to be turned off. In the fourth time period of a working cycle (for example, the time period between time t8 and time t9), the sixth switch K6, the seventh switch K7, the tenth switch K10, the eleventh switch K11, the thirteenth switch K13, the fourteenth switch K14 and the sixteenth switch K16 are controlled to be turned on, and the other switches are controlled to be turned off. In the fifth time period of a working cycle (for example, the time period between time t9 and time t10), the fifth switch K5, the eighth switch K8, the tenth switch K10, the eleventh switch K11, the thirteenth switch K13, the fourteenth switch K14 and the sixteenth switch K16 are controlled to be turned on, and the other switches are controlled to be turned off. In the sixth time period of a working cycle (for example, the time period between time t10 and time t11), the fifth switch K5, the eighth switch K8, the ninth switch K9, the eleventh switch K11, the thirteenth switch K13, the fourteenth switch K14, the fifteenth switch K15 and the sixteenth switch K16 are controlled to be turned on, and the other switches are controlled to be turned off. In the seventh time period of a working cycle (for example, the time period between time t11 and time t12), the fifth switch K5, the eighth switch K8, the ninth switch K9, the twelfth switch K12, the fourteenth switch K14 and the fifteenth switch K15 are controlled to be turned on, and the other switches are controlled to be turned off. In the eighth time period of a working cycle (for example, the time period between time t12 and time t13), the fifth switch K5, the eighth switch K8, the ninth switch K9, the twelfth switch K12, the thirteenth switch K13, the fourteenth switch K14 and the fifteenth switch K15 are controlled to be turned on, and the other switches are controlled to be turned off. The signal output module 12 , the rectifying and waving module 13 and the second conversion branch 20 have the same working cycle, and are different from the working cycle of the AC power supply.In an optional embodiment of the present application, the working cycle of the rectifier module 11 is configured to be 50 Hz, and the working cycles of the signal output module 12 , the rectifier and wave generator module 13 and the second conversion branch 20 are configured to be 100 Hz.

[0094] Through the above process, the controller 30 controls each switch (including the fifth switch K5 to the sixteenth switch K16) to be in a corresponding working state within eight time periods of a working cycle, so as to convert the AC power rectified by the rectifier module 11 into the first DC power VD1, and convert the first DC power VD1 into the second DC power VD2 by stepping down.

[0095] An embodiment of the present application further provides a vehicle-mounted power supply, which includes the voltage conversion circuit 100 in any embodiment of the present application.

[0096] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

[0097] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them. Under the idea of ​​the present application, the technical features in the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order. It should be understood by ordinary technicians in this field that they can still modify the technical solutions recorded in the above embodiments, or replace some of the technical features by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A voltage conversion circuit, characterized in that: include: Controller; A first conversion branch, connected to the controller and inputting an AC power source, and configured to be controlled by the controller to convert the AC power source into a first DC power source; The first conversion branch includes a rectifier module, a signal output module, a transformer and a rectifier wave generator module which are connected in sequence, and the rectifier module, the signal output module and the rectifier wave generator module are all controlled by the controller; The rectifying module rectifies the AC power supply and then inputs it into the signal output module, so that the signal output module outputs a high-frequency signal to the transformer, and the rectifying and emitting module rectifies the signal output by the transformer and then outputs the first DC power supply; A second conversion branch is connected to the controller, the second conversion branch includes a first winding, and the first winding is coupled to the magnetic core of the transformer, so that the combination of the rectifying and waving module and the second conversion branch is controlled by the controller to convert the first DC power supply into a second DC power supply, wherein the rectifying and waving module also outputs a high-frequency signal to the transformer based on the first DC power supply.

2. The voltage conversion circuit according to claim 1, characterized in that: The first conversion branch also includes: The filter module is connected between the AC power supply and the rectifier module, and is configured to filter the AC power supply and then input the filtered AC power to the rectifier module.

3. The voltage conversion circuit according to claim 2, characterized in that: The filtering module includes a first capacitor, a first inductor and a second capacitor; The first end of the first capacitor is connected to the first end of the AC power supply and the first end of the first inductor respectively, the second end of the first capacitor is connected to the second end of the AC power supply, the second end of the first inductor is connected to the first end of the second capacitor and the first end of the rectifier module respectively, and the second end of the second capacitor is connected to the second end of the AC power supply and the second end of the rectifier module.

4. The voltage conversion circuit according to claim 1, characterized in that: The rectifier module includes a first switch, a second switch, a third switch and a fourth switch; The first switch and the second switch are connected in series between the first end and the second end of the signal output module, and the connection point between the first switch and the second switch is connected to the first end of the AC power supply; The third switch and the fourth switch are connected in series between the first end and the second end of the signal output module, and the connection point between the third switch and the fourth switch is connected to the second end of the AC power supply; Control ends of the first switch, the second switch, the third switch and the fourth switch are all connected to the controller.

5. The voltage conversion circuit according to claim 1, characterized in that: The signal output module includes a fifth switch, a sixth switch, a seventh switch and an eighth switch, and the transformer includes a second winding; The fifth switch and the sixth switch are connected in series between the first end and the second end of the rectifier module, and the connection point between the fifth switch and the sixth switch is connected to the second end of the second winding; The seventh switch and the eighth switch are connected in series between the first end and the second end of the rectifier module, and the connection point between the seventh switch and the eighth switch is connected to the first end of the second winding; Control ends of the fifth switch, the sixth switch, the seventh switch and the eighth switch are all connected to the controller.

6. The voltage conversion circuit according to claim 5, characterized in that: The rectifying and waving module includes a ninth switch, a tenth switch, an eleventh switch and a twelfth switch, and the transformer includes a third winding; The ninth switch is connected in series with the tenth switch, and a connection point between the ninth switch and the tenth switch is connected to a first end of the third winding; the eleventh switch is connected in series with the twelfth switch, and a connection point between the eleventh switch and the twelfth switch is connected to a second end of the third winding; One end of the combination of the ninth switch and the tenth switch connected in series and the combination of the eleventh switch and the twelfth switch connected in series in parallel is the first end of the first DC power supply, and the other end is the second end of the first DC power supply; Control ends of the ninth switch, the tenth switch, the eleventh switch, and the twelfth switch are all connected to the controller.

7. The voltage conversion circuit according to claim 6, characterized in that: The first conversion branch further includes a second inductor, a third capacitor and a fourth capacitor; The second inductor is connected between a connection point between the seventh switch and the eighth switch and the second end of the second winding, a combination of the fifth switch and the sixth switch in series is connected in parallel with the third capacitor, and a combination of the ninth switch and the tenth switch in series is connected in parallel with the fourth capacitor.

8. The voltage conversion circuit according to claim 1, characterized in that: The second conversion branch includes a thirteenth switch, a fourteenth switch, a fifteenth switch, a sixteenth switch, a third inductor, a fourth inductor and a fifth capacitor; One end of the combination of the fourteenth switch and the fifteenth switch connected in series is connected to the second end of the first winding, and the other end is connected to one end of the combination of the thirteenth switch and the sixteenth switch connected in series and the first end of the fifth capacitor, and serves as the second end of the second DC power supply, the other end of the combination of the thirteenth switch and the sixteenth switch connected in series is connected to the first end of the first winding, the connection point between the fourteenth switch and the fifteenth switch is connected to the first end of the fourth inductor, the connection point between the thirteenth switch and the sixteenth switch is connected to the first end of the third inductor, the second end of the third inductor is respectively connected to the second end of the fourth inductor and the second end of the fifth capacitor, and serves as the first end of the second DC power supply; Control ends of the thirteenth switch, the fourteenth switch, the fifteenth switch, and the sixteenth switch are all connected to the controller.

9. A vehicle-mounted power supply, characterized in that: Comprising the voltage conversion circuit as described in any one of claims 1-8.

Images