Full-wave rectification circuit with hold-up time prolonging function and control method thereof

Abstract

The invention provides a full-wave rectification circuit with a hold-up time prolonging function and a control method thereof, and the circuit comprises K groups of first switching circuit units, M groups of second switching circuit units, N groups of third switching circuit units, P groups of fourth switching circuit units, a transformer, a filter capacitor, a filter inductor, and a load. One end of each first switching circuit unit is connected with a secondary winding of the transformer, and the other end is connected with a load; one end of each second switch circuit unit is connected with a secondary winding of the transformer, and the other end is connected with a load; the filter inductor is respectively connected with a secondary winding of the transformer and a load; one end of each third switch circuit unit is connected with the secondary winding of the transformer, and the other end is connected with the filter inductor; the filter capacitor is respectively connected with the filter inductor and the load; one end of each fourth switch circuit unit is connected with the secondary winding of the transformer, and the other end is connected with the filter capacitor. As a result, it is possible to ensure the power density of the system while prolonging the hold-up time.

Description

Technical Field

[0001] The present invention relates to the technical field of power electronics, and in particular to a full-wave rectifier circuit with a function of extending the hold-up time and a control method of the full-wave rectifier circuit with a function of extending the hold-up time. Background Art

[0002] In order to meet the user's requirements for power supply stability, for the full-wave rectifier circuit, when the input voltage of the input power supply suddenly drops or power outages, it is necessary to ensure that the power supply system output is normal within a certain maintenance time (i.e., hold-up time) so as not to affect the working state of the overall system.

[0003] In the related art, the hold-up time is usually extended by increasing the busbar capacitance. However, when the above method is adopted, as the rated power of the system increases, the capacity and volume of the energy storage capacitor that meets the requirements also increase, resulting in a decrease in the power density of the system. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a full-wave rectifier circuit with a function of extending the hold-up time. The function of extending the hold-up time can be achieved without increasing the capacitance of the bus capacitor, thereby ensuring the power density of the system.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A full-wave rectifier circuit with a function of extending hold-up time, comprising: K groups of first switch circuit units, M groups of second switch circuit units, N groups of third switch circuit units, P groups of fourth switch circuit units, a transformer, a filter capacitor, a filter inductor and a load, K and M are integers greater than or equal to 0, N and P are positive integers, wherein one end of each group of the first switch circuit units is connected to the first end of the secondary winding of the transformer, and the other end of each group of the first switch circuit units is connected to one end of the load; one end of each group of the second switch circuit units is connected to the first end of the secondary winding of the transformer, and the other end of each group of the second switch circuit units is connected to the other end of the load connected; one end of the filter inductor is connected to the second end of the secondary winding of the transformer, and the other end of the filter inductor is connected to the other end of the load; one end of each group of the third switch circuit units is connected to the third end of the secondary winding of the transformer, and the other end of each group of the third switch circuit units is connected to the other end of the filter inductor; one end of the filter capacitor is connected to the other end of the filter inductor, and the other end of the filter capacitor is connected to one end of the load; one end of each group of the fourth switch circuit units is connected to the third end of the secondary winding of the transformer, and the other end of each group of the fourth switch circuit units is connected to the other end of the filter capacitor.

[0007] In one embodiment of the present invention, the first switch circuit unit includes a first semiconductor device, a first end of the first semiconductor device is connected to a first end of the secondary winding of the transformer, and a second end of the first semiconductor device is connected to one end of the load.

[0008] In one embodiment of the present invention, the second switching circuit unit includes a second semiconductor device and a first diode, the second end of the second semiconductor device is connected to the first end of the secondary winding of the transformer, the cathode of the first diode is connected to the first end of the second semiconductor device, and the anode of the first diode is connected to the other end of the load.

[0009] In one embodiment of the present invention, the third switching circuit unit includes: a third semiconductor device and a second diode, the second end of the third semiconductor device is connected to the third end of the secondary winding of the transformer, the cathode of the second diode is connected to the first end of the third semiconductor device, and the anode of the second diode is connected to the other end of the filter capacitor.

[0010] In one embodiment of the present invention, the fourth switch circuit unit includes: a fourth semiconductor device, a first end of the fourth semiconductor device is connected to the third end of the secondary winding of the transformer, and a second end of the fourth semiconductor device is connected to the other end of the filter capacitor.

[0011] A control method for a full-wave rectifier circuit with a function of extending the hold-up time, the full-wave rectifier circuit comprising: K groups of first switch circuit units, M groups of second switch circuit units, N groups of third switch circuit units, P groups of fourth switch circuit units, a transformer, a filter capacitor, a filter inductor and a load, K, M, N and P are all positive integers, wherein one end of each group of the first switch circuit units is connected to the first end of the secondary winding of the transformer, the other end of each group of the first switch circuit units is connected to one end of the load, one end of each group of the second switch circuit units is connected to the first end of the secondary winding of the transformer, and each group The other end of each of the second switch circuit units is connected to the other end of the load, one end of the filter inductor is connected to the second end of the secondary winding of the transformer, and the other end of the filter inductor is connected to the other end of the load, one end of each group of the third switch circuit units is connected to the third end of the secondary winding of the transformer, and the other end of each group of the third switch circuit units is connected to the other end of the filter inductor, one end of the filter capacitor is connected to the other end of the filter inductor, and the other end of the filter capacitor is connected to one end of the load, and one end of each group of the fourth switch circuit units is connected to the transformer The third end of the secondary winding of the transformer is connected to the third end of the secondary winding of the transformer, and the other end of each group of the fourth switch circuit units is connected to the other end of the filter capacitor, wherein the control method comprises the following steps: when the input voltage of the input power supply of the full-wave rectifier circuit suddenly drops or is powered off, judging whether the same-name end of the transformer is positive; if the same-name end of the transformer is positive, controlling the third switch circuit unit to be in a conducting state, and controlling the first switch circuit unit, the second switch circuit unit and the fourth switch circuit unit to be in a shut-off state, and after a first preset time, controlling the fourth switch circuit unit to be in a conducting state, and controlling the first switch circuit unit, the second switch circuit unit and the third switch circuit unit to be in a shut-off state; if the same-name end of the transformer is negative, controlling the second switch circuit unit to be in a conducting state, and controlling the first switch circuit unit, the third switch circuit unit and the fourth switch circuit unit to be in a shut-off state, and after a second preset time, controlling the first switch circuit unit to be in a conducting state, and controlling the second switch circuit unit, the third switch circuit unit and the fourth switch circuit unit to be in a shut-off state.

[0012] A control method for a full-wave rectifier circuit with a function of extending the hold-up time, the full-wave rectifier circuit comprising N groups of third switch circuit units, P groups of fourth switch circuit units, a transformer, a filter capacitor, a filter inductor and a load, N and P are positive integers, one end of the filter inductor is connected to one end of the secondary winding of the transformer, the other end of the filter inductor is connected to the other end of the load, one end of each group of the third switch circuit units is connected to the other end of the secondary winding of the transformer, the other end of each group of the third switch circuit units is connected to the other end of the filter inductor; one end of the filter capacitor is connected to the other end of the filter inductor, and the The other end of the filter capacitor is connected to one end of the load; one end of each group of the fourth switch circuit units is connected to the other end of the secondary winding of the transformer, and the other end of each group of the fourth switch circuit units is connected to the other end of the filter capacitor, wherein the control method comprises the following steps: when the input voltage of the input power supply of the full-wave rectifier circuit suddenly drops or the power is cut off, the third switch circuit is controlled to be in the on state, and the fourth switch circuit is controlled to be in the off state, and after a third preset time, the fourth switch circuit is controlled to be in the on state, and the third switch circuit is controlled to be in the off state.

[0013] Beneficial effects of the present invention:

[0014] The present invention can achieve the function of extending the hold-up time without increasing the capacitance of the bus capacitor, thereby ensuring the power density of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the structure of a full-wave rectifier circuit with a function of extending the hold-up time according to an embodiment of the present invention;

[0016] Figure 2a and 2b It is a structural schematic diagram of a full-wave rectifier circuit with a function of extending the hold-up time according to a specific embodiment of the present invention;

[0017] Figure 3a and 3b It is a structural schematic diagram of a full-wave rectifier circuit with a function of extending the hold-up time according to another specific embodiment of the present invention;

[0018] Figure 4a and 4b The figure is a schematic structural diagram of a full-wave rectifier circuit with a function of extending the hold-up time according to another specific embodiment of the present invention. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Figure 1 4 is a schematic structural diagram of a full-wave rectifier circuit with a function of extending the hold-up time according to an embodiment of the present invention.

[0021] Specifically, Figure 1 As shown, the full-wave rectifier circuit with a function of extending the hold-up time according to the embodiment of the present invention may include: K groups of first switch circuit units 100 ( Figure 1 Only one group is shown), M groups of second switch circuit units 200 ( Figure 1 Only one group is shown), N groups of third switch circuit units 300 ( Figure 1 Only one group is shown), P groups of fourth switch circuit units 400 ( Figure 1 Only one group is shown), transformer T, filter capacitor C, filter inductor L and load R, K and M are integers greater than or equal to 0, and N and P are positive integers.

[0022] Among them, one end of each group of first switch circuit units 100 is connected to the first end of the secondary winding of the transformer T, and the other end of each group of first switch circuit units 100 is connected to one end of the load R; one end of each group of second switch circuit units 200 is connected to the first end of the secondary winding of the transformer T, and the other end of each group of second switch circuit units 200 is connected to the other end of the load R; one end of the filter inductor L is connected to the second end of the secondary winding of the transformer T, and the other end of the filter inductor L is connected to the other end of the load R; one end of each group of third switch circuit units 300 is connected to the third end of the secondary winding of the transformer T, and the other end of each group of third switch circuit units 300 is connected to the other end of the filter inductor L; one end of the filter capacitor C is connected to the other end of the filter inductor L, and the other end of the filter capacitor C is connected to one end of the load R; one end of each group of fourth switch circuit units 400 is connected to the third end of the secondary winding of the transformer T, and the other end of each group of fourth switch circuit units 400 is connected to the other end of the filter capacitor C.

[0023] In one embodiment of the present invention, Figure 1 As shown, the first switch circuit unit 100 includes a first semiconductor device S1, a first end of the first semiconductor device S1 is connected to a first end of a secondary winding of a transformer T, and a second end of the first semiconductor device S1 is connected to one end of a load R.

[0024] In one embodiment of the present invention, Figure 1 As shown, the second switching circuit unit 200 includes a second semiconductor device S2 and a first diode D1, the second end of the second semiconductor device S2 is connected to the first end of the secondary winding of the transformer T, the cathode of the first diode D1 is connected to the first end of the second semiconductor device S2, and the anode of the first diode D1 is connected to the other end of the load R.

[0025] In one embodiment of the present invention, Figure 1 As shown, the third switch circuit unit 300 includes: a third semiconductor device S3 and a second diode D2, the second end of the third semiconductor device S3 is connected to the third end of the secondary winding of the transformer T, the cathode of the second diode D2 is connected to the first end of the third semiconductor device S3, and the anode of the second diode D2 is connected to the other end of the filter capacitor C.

[0026] In one embodiment of the present invention, Figure 1 As shown, the fourth switch circuit unit 400 includes: a fourth semiconductor device S4, a first end of the fourth semiconductor device S4 is connected to the third end of the secondary winding of the transformer T, and a second end of the fourth semiconductor device S4 is connected to the other end of the filter capacitor C.

[0027] The following describes in detail how to achieve the hold-up time extension function in conjunction with a full-wave rectifier circuit with the hold-up time extension function.

[0028] As a possible implementation, K and M can be positive integers. In this case, the full-wave rectifier circuit is as follows: Figure 2a , 2b , 3a and 3b (the arrow direction in the figure represents the circuit conduction direction). Specifically, when the input voltage of the input power supply of the full-wave rectifier circuit suddenly drops or the power is cut off, it can be determined whether the same-name terminal of the transformer T is positive. If the same-name terminal of the transformer T is positive, such as Figure 2a As shown, the third switch circuit unit 300 can be controlled to be in the on state, and the first switch circuit unit 100, the second switch circuit unit 200 and the fourth switch circuit unit 400 can be controlled to be in the off state. Specifically, the third semiconductor device S3 can be controlled to be on, and the first semiconductor device S1, the second semiconductor device S2 and the fourth semiconductor device S4 can be controlled to be off. At this time, the transformer T charges the filter inductor L through the third semiconductor device S3 and the second diode D2, and the filter capacitor C supplies power to the load R. After the first preset time continues, as shown in FIG. Figure 2bAs shown, the fourth switch circuit unit 400 is controlled to be in the on state, and the first switch circuit unit 100, the second switch circuit unit 200 and the third switch circuit unit 300 are controlled to be in the off state. Specifically, the fourth semiconductor device S4 can be controlled to be on, and the first semiconductor device S1, the second semiconductor device S2 and the third semiconductor device S3 can be controlled to be off. At this time, the transformer T and the filter inductor L supply power to the load R through the fourth semiconductor device S4.

[0029] If the transformer's same-name terminal is negative, such as Figure 3a As shown, the second switch circuit unit 200 can be controlled to be in the on state, and the first switch circuit unit 100, the third switch circuit unit 300 and the fourth switch circuit unit 400 can be controlled to be in the off state. Specifically, the second semiconductor device S2 can be controlled to be on, and the first semiconductor device S1, the third semiconductor device S3 and the fourth semiconductor device S4 can be controlled to be off. At this time, the transformer T charges the filter inductor L through the second semiconductor device S2 and the first diode D1, and the filter capacitor C supplies power to the load R. After the second preset time continues, as shown in FIG. Figure 3b As shown, the first switch circuit unit 100 is controlled to be in the on state, and the second switch circuit unit 200, the third switch circuit unit 300 and the fourth switch circuit unit 400 are controlled to be in the off state. Specifically, the first semiconductor device S1 can be controlled to be on, and the second semiconductor device S1, the third semiconductor device S3 and the fourth semiconductor device S4 can be controlled to be off. At this time, the transformer T and the filter inductor L supply power to the load R through the first semiconductor device S1.

[0030] As another possible implementation, K and M can be 0. In this case, the full-wave rectifier circuit is as follows: Figure 4a and 4b As shown in the figure (the direction of the arrow in the figure represents the direction of circuit conduction). Specifically, when the input voltage of the input power supply of the full-wave rectifier circuit suddenly drops or the power is cut off, as Figure 4a As shown, the third switch circuit unit 300 can be controlled to be in the on state, and the fourth switch circuit unit can be controlled to be in the off state. Specifically, the third semiconductor device S3 can be controlled to be on, and the fourth semiconductor device S4 can be controlled to be off. At this time, the transformer T charges the filter inductor L through the third semiconductor device S3 and the second diode D2, and the filter capacitor C supplies power to the load R. After the third preset time continues, as shown in FIG. Figure 4b As shown, the fourth switch circuit unit 400 is controlled to be in the on state, and the third switch circuit unit 300 is controlled to be in the off state. Specifically, the fourth semiconductor device S4 can be controlled to be on, and the third semiconductor device S3 can be controlled to be off. At this time, the transformer T and the filter inductor L supply power to the load R through the fourth semiconductor device S4.

[0031] It should be noted that when K and M are 0, the transformer form will change accordingly, that is, the output end of the secondary winding of the transformer has only two output ports, such as Figure 4a and 4b In addition, in the above embodiments, controlling a certain switch circuit unit to be in the on state may be controlling one or more groups of the switch circuit units to be turned on, for example, controlling the third switch circuit unit 300 to be in the on state, that is, controlling one or more groups of the third switch circuit units 300 to be turned on, which may be specifically controlled according to the output current demand of the full-wave rectifier circuit; controlling a certain switch circuit unit to be in the off state may be controlling all groups of the switch circuit units to be turned off, for example, controlling the third switch circuit unit 300 to be in the off state, that is, controlling each group of the third switch circuit units 300 to be in the off state.

[0032] In summary, according to the embodiment of the present invention, the method for extending the hold-up A full-wave rectifier circuit with time function is composed of K groups of first switch circuit units, M groups of second switch circuit units, N groups of third switch circuit units, P groups of fourth switch circuit units, a transformer, a filter capacitor, a filter inductor and a load, wherein one end of each group of first switch circuit units is connected to the first end of the secondary winding of the transformer, and the other end of each group of first switch circuit units is connected to one end of the load; one end of each group of second switch circuit units is connected to the first end of the secondary winding of the transformer, and the other end of each group of second switch circuit units is connected to the other end of the load; one end of the filter inductor is connected to the second end of the secondary winding of the transformer, and the other end of the filter inductor is connected to the other end of the load; one end of each group of third switch circuit units is connected to the third end of the secondary winding of the transformer, and the other end of each group of third switch circuit units is connected to the other end of the filter inductor; one end of the filter capacitor is connected to the other end of the filter inductor, and the other end of the filter capacitor is connected to one end of the load; one end of each group of fourth switch circuit units is connected to the third end of the secondary winding of the transformer, and the other end of each group of fourth switch circuit units is connected to the other end of the filter capacitor. Therefore, the hold-up time can be extended without increasing the bus capacitor value, thereby ensuring the power density of the system.

[0033] Corresponding to the full-wave rectifier circuit with a function of extending the hold-up time in the above-mentioned embodiment, the present invention further proposes a control method for the full-wave rectifier circuit with a function of extending the hold-up time.

[0034] like Figure 2a , 2b, 3a and 3b, the full-wave rectifier circuit may include: K groups of first switch circuit units 100, M groups of second switch circuit units 200, N groups of third switch circuit units 300, P groups of fourth switch circuit units 400, a transformer T, a filter capacitor C, a filter inductor L and a load R, K, M, N and P are all positive integers, wherein one end of each group of first switch circuit units 100 is connected to the first end of the secondary winding of the transformer T, the other end of each group of first switch circuit units 100 is connected to one end of the load R, one end of each group of second switch circuit units 200 is connected to the first end of the secondary winding of the transformer T, and the other end of each group of second switch circuit units 200 is connected to the first end of the secondary winding of the transformer T. Each of the third switching circuit units 300 is connected to the other end of the load R, one end of the filter inductor L is connected to the second end of the secondary winding of the transformer T, and the other end of the filter inductor L is connected to the other end of the load R, one end of each group of third switching circuit units 300 is connected to the third end of the secondary winding of the transformer T, and the other end of each group of third switching circuit units 300 is connected to the other end of the filter inductor L, one end of the filter capacitor C is connected to the other end of the filter inductor L, and the other end of the filter capacitor C is connected to one end of the load R, one end of each group of fourth switching circuit units 400 is connected to the third end of the secondary winding of the transformer T, and the other end of each group of fourth switching circuit units 400 is connected to the other end of the filter capacitor C.

[0035] The control method includes the following steps: when the input voltage of the input power supply of the full-wave rectifier circuit suddenly drops or the power is cut off, determine whether the same-name terminal of the transformer is positive; if the same-name terminal of the transformer is positive, control the third switch circuit unit to be in the on state, and control the first switch circuit unit, the second switch circuit unit and the fourth switch circuit unit to be in the off state, and after a first preset time, control the fourth switch circuit unit to be in the on state, and control the first switch circuit unit, the second switch circuit unit and the third switch circuit unit to be in the off state; if the same-name terminal of the transformer is negative, control the second switch circuit unit to be in the on state, and control the first switch circuit unit, the third switch circuit unit and the fourth switch circuit unit to be in the off state, and after a second preset time, control the first switch circuit unit to be in the on state, and control the second switch circuit unit, the third switch circuit unit and the fourth switch circuit unit to be in the off state.

[0036] It should be noted that for details not disclosed in the control method of the full-wave rectifier circuit with a function of extending the hold-up time in an embodiment of the present invention, please refer to the details disclosed in the full-wave rectifier circuit with a function of extending the hold-up time in an embodiment of the present invention, and the specific details will not be described in detail here.

[0037] According to the control method of the full-wave rectifier circuit with the function of extending the hold-up time in the embodiment of the present invention, the function of extending the hold-up time can be realized without increasing the capacitance of the bus capacitor, thereby ensuring the power density of the system.

[0038] Corresponding to the full-wave rectifier circuit with a function of extending the hold-up time in the above-mentioned embodiment, the present invention further proposes another control method for the full-wave rectifier circuit with a function of extending the hold-up time.

[0039] like Figure 4a and 4b As shown, the full-wave rectifier circuit includes: N groups of third switch circuit units 300, P groups of fourth switch circuit units 400, a transformer T, a filter capacitor C, a filter inductor L and a load R, N and P are positive integers, one end of the filter inductor L is connected to one end of the secondary winding of the transformer T, and the other end of the filter inductor L is connected to the other end of the load R, one end of each group of third switch circuit units 300 is connected to the other end of the secondary winding of the transformer T, and the other end of each group of third switch circuit units 300 is connected to the other end of the filter inductor L; one end of the filter capacitor C is connected to the other end of the filter inductor L, and the other end of the filter capacitor C is connected to one end of the load R; one end of each group of fourth switch circuit units 400 is connected to the other end of the secondary winding of the transformer T, and the other end of each group of fourth switch circuit units 400 is connected to the other end of the filter capacitor C.

[0040] The control method includes the following steps: when the input voltage of the input power supply of the full-wave rectifier circuit suddenly drops or the power is cut off, the third switch circuit is controlled to be in the on state, and the fourth switch circuit is controlled to be in the off state, and after a third preset time, the fourth switch circuit is controlled to be in the on state, and the third switch circuit is controlled to be in the off state.

[0041] It should be noted that for details not disclosed in the control method of the full-wave rectifier circuit with a function of extending the hold-up time in an embodiment of the present invention, please refer to the details disclosed in the full-wave rectifier circuit with a function of extending the hold-up time in an embodiment of the present invention, and the specific details will not be described in detail here.

[0042] According to the control method of the full-wave rectifier circuit with the function of extending the hold-up time in the embodiment of the present invention, the function of extending the hold-up time can be realized without increasing the capacitance of the bus capacitor, thereby ensuring the power density of the system.

[0043] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0046] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0047] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0048] In addition, each functional unit in each embodiment of the present invention may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above integrated module may be implemented in the form of hardware or in the form of software functional modules.

[0049] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A full-wave rectifier circuit with a function of extending the hold-up time, characterized in that: include: K groups of first switch circuit units, M groups of second switch circuit units, N groups of third switch circuit units, P groups of fourth switch circuit units, transformers, filter capacitors, filter inductors and loads, K and M are integers greater than or equal to 0, N and P are positive integers, wherein, One end of each group of the first switch circuit units is connected to the first end of the secondary winding of the transformer, and the other end of each group of the first switch circuit units is connected to one end of the load; One end of each group of the second switch circuit units is connected to the first end of the secondary winding of the transformer, and the other end of each group of the second switch circuit units is connected to the other end of the load; One end of the filter inductor is connected to the second end of the secondary winding of the transformer, and the other end of the filter inductor is connected to the other end of the load; One end of each group of the third switch circuit units is connected to the third end of the secondary winding of the transformer, and the other end of each group of the third switch circuit units is connected to the other end of the filter inductor; One end of the filter capacitor is connected to the other end of the filter inductor, and the other end of the filter capacitor is connected to one end of the load; One end of each group of the fourth switch circuit units is connected to the third end of the secondary winding of the transformer, and the other end of each group of the fourth switch circuit units is connected to the other end of the filter capacitor.

2. The full-wave rectifier circuit with a function of extending the hold-up time according to claim 1, characterized in that: The first switch circuit unit includes a first semiconductor device, a first end of the first semiconductor device is connected to a first end of the secondary winding of the transformer, and a second end of the first semiconductor device is connected to one end of the load.

3. The full-wave rectifier circuit with a function of extending the hold-up time according to claim 1, characterized in that: The second switching circuit unit includes a second semiconductor device and a first diode, the second end of the second semiconductor device is connected to the first end of the secondary winding of the transformer, the cathode of the first diode is connected to the first end of the second semiconductor device, and the anode of the first diode is connected to the other end of the load.

4. The full-wave rectifier circuit with a function of extending the hold-up time according to claim 1, characterized in that: The third switching circuit unit includes: a third semiconductor device and a second diode, the second end of the third semiconductor device is connected to the third end of the secondary winding of the transformer, the cathode of the second diode is connected to the first end of the third semiconductor device, and the anode of the second diode is connected to the other end of the filter capacitor.

5. The full-wave rectifier circuit with a function of extending the hold-up time according to claim 1, characterized in that: The fourth switch circuit unit includes: a fourth semiconductor device, a first end of the fourth semiconductor device is connected to the third end of the secondary winding of the transformer, and a second end of the fourth semiconductor device is connected to the other end of the filter capacitor.

6. A control method for a full-wave rectifier circuit with a function of extending the hold-up time, characterized in that: The full-wave rectifier circuit includes: K groups of first switch circuit units, M groups of second switch circuit units, N groups of third switch circuit units, P groups of fourth switch circuit units, a transformer, a filter capacitor, a filter inductor and a load, K, M, N and P are all positive integers, wherein one end of each group of the first switch circuit units is connected to the first end of the secondary winding of the transformer, the other end of each group of the first switch circuit units is connected to one end of the load, one end of each group of the second switch circuit units is connected to the first end of the secondary winding of the transformer, the other end of each group of the second switch circuit units is connected to the other end of the load, one end of the filter inductor is connected to the The second end of the secondary winding of the transformer is connected, the other end of the filter inductor is connected to the other end of the load, one end of each group of the third switch circuit units is connected to the third end of the secondary winding of the transformer, the other end of each group of the third switch circuit units is connected to the other end of the filter inductor, one end of the filter capacitor is connected to the other end of the filter inductor, the other end of the filter capacitor is connected to one end of the load, one end of each group of the fourth switch circuit units is connected to the third end of the secondary winding of the transformer, and the other end of each group of the fourth switch circuit units is connected to the other end of the filter capacitor, wherein the control method comprises the following steps: When the input voltage of the input power supply of the full-wave rectifier circuit suddenly drops or is powered off, determining whether the same-name terminal of the transformer is positive; If the same-name terminal of the transformer is positive, the third switch circuit unit is controlled to be in an on state, and the first switch circuit unit, the second switch circuit unit and the fourth switch circuit unit are controlled to be in an off state, and after a first preset time, the fourth switch circuit unit is controlled to be in an on state, and the first switch circuit unit, the second switch circuit unit and the third switch circuit unit are controlled to be in an off state; If the same-name terminal of the transformer is negative, the second switch circuit unit is controlled to be in the on state, and the first switch circuit unit, the third switch circuit unit and the fourth switch circuit unit are controlled to be in the off state, and after a second preset time, the first switch circuit unit is controlled to be in the on state, and the second switch circuit unit, the third switch circuit unit and the fourth switch circuit unit are controlled to be in the off state.

7. A control method for a full-wave rectifier circuit with a function of extending the hold-up time, characterized in that: The full-wave rectifier circuit comprises: N groups of third switch circuit units, P groups of fourth switch circuit units, a transformer, a filter capacitor, a filter inductor and a load, N and P are positive integers, one end of the filter inductor is connected to one end of the secondary winding of the transformer, the other end of the filter inductor is connected to the other end of the load, one end of each group of the third switch circuit units is connected to the other end of the secondary winding of the transformer, and the other end of each group of the third switch circuit units is connected to the other end of the filter inductor; one end of the filter capacitor is connected to the other end of the filter inductor, and the other end of the filter capacitor is connected to one end of the load; one end of each group of the fourth switch circuit units is connected to the other end of the secondary winding of the transformer, and the other end of each group of the fourth switch circuit units is connected to the other end of the filter capacitor, wherein the control method comprises the following steps: When the input voltage of the input power supply of the full-wave rectifier circuit suddenly drops or is powered off, the third switch circuit is controlled to be in an on state, and the fourth switch circuit is controlled to be in an off state. After a third preset time, the fourth switch circuit is controlled to be in an on state, and the third switch circuit is controlled to be in an off state.

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