Isolation driving circuit, power converter and power supply
Through the multi-transformer parallel structure and the design of a single input control switch, the problems of inflexible wiring and high cost in traditional isolated power supplies are solved, and more efficient PCB board design and cost savings are achieved.
Patent Information
- Application Number
- CN202422418823.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-09-30
AI Technical Summary
In traditional isolated power supplies, the control switch wiring of multiple transformers is inflexible and costly, resulting in complex and increased PCB board design.
The multi-transformer parallel structure is adopted to control the working state of all transformers through an input control switch, reducing the number of control signals and improving trace flexibility.
Improves the routing flexibility of PCB board to multiple transformer control sections, reduces costs and improves product quality.
Smart Images
Figure CN223194613U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of drive technology, and in particular to an isolation drive circuit, a power converter, and a power supply. Background Art
[0002] Isolated power supplies are currently widely used due to their ability to achieve isolated power transmission. However, traditional isolated power supplies use multiple independent control switches to control the corresponding transformers in the transformer module. Because each control switch requires a trace on the PCB to carry its control signal, a large number of transformers in a transformer module also requires a large number of control switches. This results in inflexible and costly routing of the control components (i.e., the multiple control switches) on the PCB to the multiple transformers. Utility Model Content
[0003] In view of this, an embodiment of the present application provides an isolation drive circuit, which aims to improve the routing flexibility from a PCB board to multiple transformer control parts in an isolated power supply.
[0004] The technical solution of the embodiment of the present application is implemented as follows:
[0005] In a first aspect, an embodiment of the present application provides an isolation driving circuit, the isolation driving circuit comprising:
[0006] Voltage input interface, used to access input voltage;
[0007] A transformer circuit comprising a plurality of transformers, wherein the primary windings of all the transformers are connected in parallel to form an input end of the transformer circuit;
[0008] an input control switch connected between the voltage input interface and the input end of the transformer circuit;
[0009] The input control switch is used to connect the input voltage and output the input voltage to the primary winding of each transformer when it is turned on, and each transformer is used to transform the connected input voltage and output it through the secondary winding; and the input control switch is used to stop outputting the input voltage to each transformer when it is turned off.
[0010] In some embodiments, the voltage input interface includes a first input terminal and a second input terminal;
[0011] The first ends of the primary windings of all the transformers are connected to the first input terminal respectively, and the second ends of the primary windings of all the transformers are connected to the second input terminal respectively.
[0012] In some embodiments, each of said transformers comprises at least one secondary winding;
[0013] The isolation drive circuit further includes:
[0014] Multiple secondary circuits are connected one-to-one with the secondary windings of all the transformers.
[0015] In some embodiments, each of the secondary circuits includes a diode and a first resistor, the anode of the diode is connected to the first end of the secondary winding, the cathode of the diode is connected to the first end of the first resistor, the second end of the first resistor is connected to the first output end of the secondary circuit, and the second end of the secondary winding is connected to the second output end of the secondary circuit.
[0016] In some embodiments, each of the secondary circuits further includes a first capacitor, a second capacitor, a second resistor, and a Zener diode;
[0017] The first end of the first capacitor is connected to the second end of the first resistor, the second end of the first capacitor is connected to the second end of the secondary winding via the second capacitor, and the second end of the first capacitor is also grounded;
[0018] The second resistor is connected in parallel with the first capacitor, the cathode of the voltage stabilizing diode is connected to the second end of the first capacitor, and the anode of the voltage stabilizing diode is connected to the second end of the secondary winding.
[0019] In some embodiments, the first end of each secondary winding and the first end of the primary winding are the same end.
[0020] In some embodiments, a first switching device is provided between the first end of the primary winding of each transformer and the first input terminal.
[0021] In some embodiments, a second switching device is provided between the second end of the primary winding of each transformer and the second input terminal.
[0022] In a second aspect, an embodiment of the present application further provides a power converter, which includes the isolation drive circuit as described in any one of the first aspects above.
[0023] In a third aspect, an embodiment of the present application further provides a power supply, which includes the isolation drive circuit as described in any one of the first aspects above; or, the power supply includes the power converter as described in the second aspect above.
[0024] The technical solution provided by the embodiment of the present application is an isolation drive circuit, which includes a voltage input interface, a transformer circuit and an input control switch; the voltage input interface is used to connect the input voltage; the transformer circuit includes multiple transformers, and the primary windings of all transformers are connected in parallel to form the input end of the transformer circuit; the input control switch is connected between the voltage input interface and the input end of the transformer circuit; the input control switch is used to connect the input voltage and output the input voltage to the primary winding of each transformer when it is turned on, and each transformer is used to transform the connected input voltage and output it through the secondary winding; and the input control switch is used to stop outputting the input voltage to each transformer when it is turned off.
[0025] In this way, the embodiment of the present application adopts a structure in which multiple transformers are connected in parallel, and the working status of all transformers can be controlled by a single input control switch. Compared with traditional control schemes, there is no need to set a control switch for the primary winding of each transformer. Therefore, there is no need to route the control signals of multiple control switches on the PCB. Only the control signals of the input control switches need to be routed on the PCB board. This can improve the routing flexibility from the PCB board to the control parts of multiple transformers, which is conducive to further improving product quality and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 A schematic diagram of a module of an isolation drive circuit provided in an embodiment of the present application;
[0027] Figure 2 A schematic structural diagram of an isolation drive circuit provided in an embodiment of the present application;
[0028] Figure 3 A schematic structural diagram of another isolation drive circuit provided in an embodiment of the present application. DETAILED DESCRIPTION
[0029] In order to make the purpose, technical solutions and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limiting this application. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.
[0030] In the description of this application, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.
[0031] In the description of this application, the terms "first," "second," etc., are used merely to distinguish similar objects and do not represent a specific ordering of the objects. It is understood that "first," "second," etc., may be interchanged with the specific order or precedence where permitted, so that the embodiments of the application described herein can be implemented in an order other than that illustrated or described herein. Unless otherwise specified, "plurality" means at least two.
[0032] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.
[0033] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.
[0034] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.
[0035] The embodiment of the present application provides an isolation driving circuit, such as Figure 1 As shown, the isolation drive circuit includes a voltage input interface 10 , a transformer circuit 20 and an input control switch 30 .
[0036] It is understandable that the voltage input interface 10 is an interface for accessing the input voltage. Figure 1 In the embodiment, the voltage input interface 10 is a DC voltage input interface 10, and the input voltage may be a DC pulse voltage.
[0037] It can be understood that the transformer circuit 20 includes multiple transformers, and the primary windings of all the transformers are connected in parallel to form the input end of the transformer circuit 20.
[0038] Exemplarily, multiple transformers are represented by T1, T2...Tn, where n is the total number of transformers. Transformers T1, T2...Tn have two main functions in the circuit: one is voltage conversion, that is, the DC pulse voltage can be increased, decreased or maintained by the turns ratio of the primary winding and the secondary winding; the other is to achieve front-end and back-end electrical isolation of the input voltage and output voltage of the input isolation drive circuit by utilizing the non-electrical connection relationship between the primary winding and the primary winding.
[0039] The structure of each transformer T1, T2...Tn is mainly divided into an iron core and a winding. The iron core is the magnetic circuit channel of the transformer, and the iron core can usually be made of ferrite. The winding is the circuit part of the transformer, which is formed by winding a certain number of turns of enameled wire on the iron core. The winding on the input side is called the primary winding, also known as the primary winding, or the primary winding. The winding on the output side is generally called the secondary winding, also known as the secondary winding, or the secondary winding. The ratio of the number of turns of the primary winding to the number of turns of the secondary winding is the turns ratio of the two. It can be understood that the turns ratio determines whether the output voltage of the secondary winding of the transformer is greater than, less than, or equal to the input DC pulse voltage, thereby achieving regulation of the input DC pulse voltage. In this embodiment, the regulation effect of each transformer on the DC pulse voltage may be the same or different, and this embodiment of the present application is not limited to this.
[0040] like Figure 2 As shown, Figure 2 The transformer circuit 20 includes n transformers, T1, T2, T3, ..., Tn. T1, T2, T3, ..., Tn are all independent transformers; the design specifications of the n transformers can be the same or different, and this application does not limit this. The primary windings of the n transformers are connected in parallel to form the input end of the transformer circuit 20. In this way, all primary windings share the same input voltage. When the input voltage is applied to one primary winding, it is also applied to all other primary windings at the same time.
[0041] Here, as Figures 1 to 3As shown, the input control switch 30 is connected between the voltage input interface 10 and the input end of the transformer circuit 20. In this embodiment, the input control switch 30 can be any one or more combinations of switching devices such as IGBT (Insulated Gate Bipolar Transistor), Metal-oxide semiconductor Field Effect Transistor (MOSFET), relay, optocoupler, single-pole single-throw switch, etc.
[0042] Here, the input control switch 30 is used to connect the input voltage and output the input voltage to the primary winding of each transformer when it is turned on. Each transformer is used to transform the connected input voltage and output it through the secondary winding, that is, all transformers are in a working state at this time; and the input control switch 30 is also used to stop outputting the input voltage to each transformer when it is turned off, that is, all transformers are in a stopped working state at this time.
[0043] In this way, the embodiment of the present application adopts a structure in which multiple transformers are connected in parallel, and the working status of all transformers can be controlled by a single input control switch 30. Compared with the traditional control scheme, there is no need to set a control switch for the primary winding of each transformer. Therefore, there is no need to route the control signals of multiple control switches on the PCB. Only the control signal of the input control switch 30 needs to be routed on the PCB board, thereby improving the routing flexibility from the PCB board to the control parts of multiple transformers, which is conducive to further improving product quality and saving costs.
[0044] In some embodiments, as Figure 2 As shown, the voltage input interface 10 includes a first input terminal DC+ and a second input terminal DC-.
[0045] Here, the first input terminal DC+ is used to input a positive voltage, and the second input terminal DC- is used to input a negative voltage.
[0046] It should be noted that the primary winding of the transformer is a port connected to the power supply side for receiving input voltage. The primary winding of the transformer includes a first end and a second end, one for receiving a positive voltage and the other for receiving a negative voltage.
[0047] Here, the first ends of the primary windings of all transformers are connected to the first input terminal, and the second ends of the primary windings of all transformers are connected to the second input terminal. This allows the primary windings of all transformers to be connected in parallel. The first end of each transformer's primary winding is used to receive a positive voltage, and the second end of the transformer's primary winding is used to receive a negative voltage. This ensures that the input positive and negative voltages are correctly transmitted to the transformer's primary winding, thereby starting the transformers in transformer circuit 20. Figure 2 In the embodiment shown, the input control switch 30 adopts a single-pole double-throw S1. Figure 3 The input control switch 30 in the embodiment shown is an N-MOS transistor; and Figure 2 and Figure 3 In the embodiment, the input control switch 30 is arranged between the second input terminal DC- and the second ends of the primary windings of all transformers; of course, in other embodiments, the input control switch 30 can also be arranged between the first input terminal DC+ and the first ends of the primary windings of all transformers.
[0048] In some embodiments, each transformer includes at least one secondary winding.
[0049] It is understood that the secondary winding refers to a set of coils inside the transformer that are connected to the load side. In the embodiments of the present application, the number of secondary windings of the transformer can be single (single winding), two (dual winding), or multiple (multi-winding), which is not limited in the embodiments of the present application.
[0050] Here, the isolation drive circuit also includes a multi-way secondary circuit 40, which is connected one-to-one with the secondary windings of all transformers. In other words, the number of secondary circuits 40 in the present application can be consistent with the number of secondary windings of all transformers. The secondary circuit 40 is used to perform corresponding current limiting and anti-reverse processing on the voltage output by the connected secondary winding and then output it, so as to achieve independent control and monitoring of the output of each transformer, thereby improving the load balancing capability, redundancy and reliability of the system. Figure 2 and Figure 3 In the illustrated embodiment, each transformer has two secondary windings. Accordingly, the total number of secondary circuits 40 is 2n.
[0051] In some embodiments, each secondary circuit 40 includes a diode and a first resistor R1, wherein the anode of the diode D1 is connected to the first end of the secondary winding, the cathode of the diode D1 is connected to the first end of the first resistor R1, and the second end of the first resistor R1 is connected to the second output end of the secondary circuit 40. The diode D1 can prevent reverse current flow, and the first resistor R1 can limit current.
[0052] Here, the diodes of each secondary circuit 40 may be represented by D1, D2, ..., Dn, respectively.
[0053] In some embodiments, each secondary circuit 40 further includes a first capacitor C1 , a second capacitor C2 , a second resistor R2 , and a Zener diode Zn.
[0054] Exemplarily, the voltage-stabilizing diode Zn is a Zener diode.
[0055] Here, a first end of the first capacitor C1 is connected to the second end of the first resistor R1 , a second end of the first capacitor C1 is connected to the second end of the secondary winding via the second capacitor C2 , and the second end of the first capacitor C1 is also grounded.
[0056] Here, the second resistor R2 is connected to the first capacitor C1 in parallel, the cathode of the Zener diode Zn is connected to the second end of the first capacitor C2, and the anode of the Zener diode Zn is connected to the second end of the secondary winding.
[0057] For example, Figure 3 As shown, there are two transformers in the transformer circuit 20, including transformer T1 and transformer T2. For transformer T1 and transformer T2, each transformer has two secondary windings, and all secondary windings are connected one-to-one with the multi-way secondary circuit 40. Figure 3 In the embodiment, the secondary circuit 40 has four paths in total, and each path is connected to a corresponding secondary winding.
[0058] Taking the secondary circuit 40 corresponding to the first secondary winding of the transformer T1 as an example, the secondary circuit 40 includes a diode D1 and a first resistor R1; the anode of the diode D1 is connected to the first end of the secondary winding, the cathode of the diode D1 is connected to the first end of the first resistor R1, the second end of the first resistor R1 is connected to the first output end of the secondary circuit 40, and the second end of the secondary winding is connected to the second output end of the secondary circuit 40.
[0059] The secondary circuit 40 also includes a first capacitor C1, a second capacitor C2, a second resistor R2 and a Zener diode Zn; the first end of the first capacitor C1 is connected to the second end of the first resistor R1, the second end of the first capacitor C1 is connected to the second end of the secondary winding via the second capacitor C2, and the second end of the first capacitor C1 is also grounded GND; the second resistor R2 is connected in parallel with the first capacitor C1, the cathode of the Zener diode Zn is connected to the second end of the first capacitor C1, and the anode of the Zener diode Zn is connected to the second end of the secondary winding.
[0060] In some embodiments, the first end of each secondary winding is the same as the first end of the primary winding.
[0061] It can be understood that the transformer's same-name terminals refer to the terminals with the same potential polarity in two (or more) windings at any time under the action of the same alternating magnetic flux. Otherwise, they are opposite-name terminals. When the two windings of the transformer are in the same direction, the starting points of the two windings are the same-name terminals. When the two windings are in opposite directions, the starting point of one winding and the ending point of the other winding are the same-name terminals. Please refer to Figure 2 and Figure 3 , the hollow points marked on the transformer T1, T2, T3...Tn coils represent the terminals of the transformer with the same name. Figure 2 and Figure 3 In the embodiment, the first end of each secondary winding and the first end of the primary winding are the same end.
[0062] In some embodiments, a first switching device (not shown) is provided between the first end of the primary winding of each transformer and the first input terminal.
[0063] At the same time, each transformer can be controlled independently. Since each transformer has an independent first switching device, the working state of each transformer can be controlled independently.
[0064] In some embodiments, a second switching device (not shown) is provided between the second end of the primary winding of each transformer and the second input terminal.
[0065] In this way, by controlling the state (on or off) of the second switching device (e.g., a toggle switch), it is possible to control whether current flows into the primary winding of the transformer. Furthermore, since each transformer has an independent second switching device, the operating state of each transformer can be independently controlled, improving the flexibility and controllability of the system. The implementation of the first and second switching devices can be referenced to the input control switch 30 and will not be further described here.
[0066] An embodiment of the present application further provides a power converter, which includes the above-mentioned isolation drive circuit.
[0067] The embodiment of the present application further provides a power supply, which includes the above-mentioned isolation drive circuit; or includes the above-mentioned power converter. Specifically, the power supply can be an isolated power supply.
[0068] For example, Figure 2 As shown, DC+ / DC- can be the input voltage of the isolated power supply, and also the primary power supply after the system is stepped down and isolated; the input control switch 30 can be the main switch of the isolated power supply, which can be an IGBT, MOS tube, etc.; T1, T2, T3...Tn are all independent transformers with the same design specifications. The secondary winding of the transformer can be single-winding, double-winding or multi-winding, which is defined according to the number of isolated power supplies required to drive the actual semiconductor.
[0069] When the entire isolated power supply operates in an open loop and a fixed duty cycle is applied to the input voltage (DC+ / DC-), the secondary outputs of T1, T2, T3…Tn correspond to the same refracted voltage and are independent of each other and do not share a common ground. Each set of transformers can be placed near the semiconductor switch tube, effectively reducing the parasitic parameters of the circuit and improving the quality of the isolated power supply.
[0070] In addition, the technical solutions described in the embodiments of the present application can be arbitrarily combined without conflict.
[0071] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by any person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.
Claims
1. An isolation drive circuit, characterized in that: The isolation driving circuit includes: Voltage input interface, used to access input voltage; A transformer circuit comprising a plurality of transformers, wherein the primary windings of all the transformers are connected in parallel to form an input end of the transformer circuit; an input control switch connected between the voltage input interface and the input end of the transformer circuit; The input control switch is used to connect the input voltage and output the input voltage to the primary winding of each transformer when it is turned on, and each transformer is used to transform the connected input voltage and output it through the secondary winding; and the input control switch is used to stop outputting the input voltage to each transformer when it is turned off.
2. The isolation driving circuit according to claim 1, wherein: The voltage input interface includes a first input terminal and a second input terminal; The first ends of the primary windings of all the transformers are connected to the first input terminal respectively, and the second ends of the primary windings of all the transformers are connected to the second input terminal respectively.
3. The isolation driving circuit according to claim 1, wherein: Each of said transformers comprises at least one secondary winding; The isolation driving circuit further includes: Multiple secondary circuits are connected one-to-one with the secondary windings of all the transformers.
4. The isolation driving circuit according to claim 3, wherein: Each of the secondary circuits includes a diode and a first resistor, the anode of the diode is connected to the first end of the secondary winding, the cathode of the diode is connected to the first end of the first resistor, the second end of the first resistor is connected to the first output end of the secondary circuit, and the second end of the secondary winding is connected to the second output end of the secondary circuit.
5. The isolation driving circuit according to claim 4, characterized in that: Each of the secondary circuits further includes a first capacitor, a second capacitor, a second resistor and a voltage stabilizing diode; The first end of the first capacitor is connected to the second end of the first resistor, the second end of the first capacitor is connected to the second end of the secondary winding via the second capacitor, and the second end of the first capacitor is also grounded; The second resistor is connected in parallel with the first capacitor, the cathode of the voltage stabilizing diode is connected to the second end of the first capacitor, and the anode of the voltage stabilizing diode is connected to the second end of the secondary winding.
6. The isolation driving circuit according to any one of claims 1 to 5, characterized in that: The first end of each secondary winding is the same as the first end of the primary winding.
7. The isolation driving circuit according to claim 2, wherein: A first switching device is provided between the first end of the primary winding of each transformer and the first input terminal.
8. The isolation driving circuit according to claim 2, wherein: A second switching device is provided between the second end of the primary winding of each transformer and the second input terminal.
9. A power converter, characterized in that: The power converter includes the isolation drive circuit according to any one of claims 1 to 8.
10. A power supply, characterized in that: The power supply includes the isolation drive circuit according to any one of claims 1 to 8; or, the power supply includes the power converter according to claim 9.