Isolation power supply module

Abstract

The utility model provides an isolation power supply module which comprises a primary side circuit, a secondary side circuit, a feedback circuit and a resistance adjustable unit, the primary side circuit comprises a control chip and a primary side winding, and the secondary side circuit comprises at least one secondary side rectification circuit; the feedback circuit is electrically connected with the primary winding and the control chip, or the feedback circuit is electrically connected with any one of the secondary rectification circuits and the control chip, and the resistance adjustable unit is electrically connected with the feedback circuit. According to the utility model, the resistance adjustable unit is additionally arranged on the basis of the feedback circuit on the primary side circuit side or the secondary side circuit side, so that the feedback voltage can be adjusted, and the control chip can change the conduction time of the primary side winding according to the change of the feedback voltage, thereby adjusting the output voltage; therefore, the input voltage and the output voltage of the isolated power supply module can be adjusted in a wide range, the voltage compatibility of the power supply module is improved, and the requirements of different driving scenes are met.

Description

Technical Field

[0001] This utility model relates to the field of power supply technology, and in particular to an isolated power supply module. Background Technology

[0002] The widespread application of third-generation semiconductor SiC MOSFETs has placed higher demands on drive power supplies. However, the drive voltage standards for SiC devices from different manufacturers are not uniform, with various specifications such as 18V, 15V, and even 12V. Therefore, when replacing SiC MOSFETs from different manufacturers, it is necessary to replace the matching drive power supply. For this reason, an isolated drive power supply with a wide voltage output range is particularly important.

[0003] Existing DC-DC isolated power supplies can be divided into two control methods: open-loop and closed-loop, depending on the control approach. Traditional open-loop schemes lack a feedback mechanism; the output is directly determined by the input and the transformer, lacking automatic adjustment capability. Therefore, their output voltage regulation accuracy, load regulation, and line regulation are all poor. Furthermore, their input range adaptability is poor, limiting adjustment over a wide range (e.g., 9 to 36V). Closed-loop schemes, on the other hand, sample the output voltage through a feedback network, compare it with a reference voltage, and adjust the PWM signal to achieve voltage regulation. This significantly improves voltage regulation accuracy, load regulation, and line regulation, and offers better input range adaptability, allowing for a wider adjustment range (e.g., 9 to 36V). However, traditional closed-loop schemes also have drawbacks. For example, the output voltage is fixed, making wide-range adjustment difficult. Adjusting the output voltage requires modifying the internal circuitry and parameters of the module, increasing the complexity of the power supply design. Utility Model Content

[0004] This invention provides an isolated power supply module, which aims to solve the problem that the output voltage of closed-loop control schemes in related technologies is difficult to adjust over a wide range.

[0005] To address the aforementioned technical problems, this utility model provides an isolated power supply module, comprising: a primary circuit, a secondary circuit, a feedback circuit, and an adjustable resistance unit. The primary circuit includes a control chip and a primary winding, and the secondary circuit includes at least one secondary rectifier circuit. The feedback circuit is electrically connected to the primary winding and the control chip, or the feedback circuit is electrically connected to any secondary rectifier circuit and the control chip, and the adjustable resistance unit is electrically connected to the feedback circuit.

[0006] Furthermore, the primary winding includes a primary main winding and a primary auxiliary winding. The primary main winding is electrically connected to the control chip, one end of the primary auxiliary winding is grounded, and the other end of the primary auxiliary winding is electrically connected to the control chip and the feedback circuit, respectively.

[0007] Furthermore, the first terminal of the feedback circuit is electrically connected to the positive terminal of the diode, and the second terminal of the feedback circuit is electrically connected to the control chip.

[0008] Furthermore, the first terminal of the feedback circuit is electrically connected to the negative terminal of the diode, and the second terminal of the feedback circuit is electrically connected to the control chip.

[0009] Furthermore, the feedback circuit includes a first resistor and a second resistor. One end of the first resistor is electrically connected to a diode, and the other end of the first resistor is electrically connected to one end of the second resistor, the control chip, and the adjustable resistance unit, respectively. The other end of the second resistor is grounded.

[0010] Furthermore, the feedback circuit includes a Zener diode, an optocoupler, and a resistor divider unit; the optocoupler is electrically connected to the control chip, the Zener diode, and the secondary rectifier circuit, respectively; the resistor divider unit is electrically connected to the secondary rectifier circuit and the Zener diode, respectively; and the adjustable resistance unit is electrically connected to the resistor divider unit.

[0011] Furthermore, the resistor voltage divider unit includes a third resistor and a fourth resistor; one end of the third resistor is electrically connected to any secondary rectifier circuit, the other end of the third resistor is electrically connected to the Zener diode, one end of the fourth resistor and the adjustable resistance unit, and the other end of the fourth resistor is grounded.

[0012] Furthermore, the adjustable resistance unit includes multiple adjustable resistance sub-units, each of which includes a fifth resistor and a switching device; one end of the fifth resistor is electrically connected to the feedback circuit, the other end of the fifth resistor is electrically connected to the first end of the switching device, the second end of the switching device is grounded, and the third end of the switching device is used for electrical connection to an external control unit.

[0013] As can be seen from the above, this utility model adds an adjustable resistance unit to the feedback circuit on the primary or secondary circuit side. By adjusting the output resistance of the adjustable resistance unit, the feedback voltage can be changed, so that the control chip can change the conduction time of the primary winding according to the change of the feedback voltage, thereby adjusting the output voltage. Thus, the input and output voltages of the isolated power module can be adjusted over a wide range, improving the voltage compatibility of the power module and meeting the needs of different driving scenarios. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the first type of isolated power supply module according to an embodiment of this utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the second type of isolated power supply module according to an embodiment of this utility model;

[0016] Figure 3 This is a circuit schematic diagram of an isolated power supply module with a first primary-side feedback architecture according to an embodiment of this utility model.

[0017] Figure 4 This is a circuit schematic diagram of an isolated power supply module with a second primary-side feedback architecture according to an embodiment of this utility model.

[0018] Figure 5 This is a circuit schematic diagram of an isolated power supply module with a secondary-side feedback architecture according to an embodiment of the present invention.

[0019] Figure 6 This is a circuit diagram of an adjustable resistance unit according to an embodiment of the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Throughout the description, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Furthermore, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0021] In related technologies, due to the problem that the output voltage of closed-loop control schemes is difficult to adjust over a wide range, this utility model provides an isolated power supply module.

[0022] like Figure 1 , Figure 2 The figures shown are schematic diagrams of the first type of isolated power supply module and the second type of isolated power supply module provided in the embodiments of this application. The isolated power supply module includes: a primary circuit 100, a secondary circuit 200, a feedback circuit 300, and a resistance adjustable unit 400. The primary circuit 100 includes a control chip 110 and a primary winding 120. The secondary circuit 200 includes at least one secondary rectifier circuit. The feedback circuit 300 is electrically connected to the primary winding 120 and the control chip 110, or the feedback circuit 300 is electrically connected to any secondary rectifier circuit and the control chip 110. The resistance adjustable unit 400 is electrically connected to the feedback circuit 300.

[0023] Specifically, the feedback circuit 300 samples the output voltage of the primary circuit 100 and the output voltage of the secondary circuit 100, and forms a feedback voltage that is transmitted to the control chip 110. The feedback circuit 300 of the isolated power supply module can be located in the primary circuit 100 or the secondary circuit 200. That is, the isolated power supply module can be either a primary-side sampling closed-loop control architecture or a secondary-side sampling closed-loop control architecture. By adding an adjustable resistance unit 400 to the feedback circuit 300, the output resistance of the adjustable resistance unit 400 can be adjusted to change the magnitude of the feedback voltage. This allows the control chip 110 to adjust the conduction time of the primary winding 120 according to the feedback voltage, thereby adjusting the output voltage. This enables the input and output voltages to be adjusted within a wide range to meet the needs of different voltage scenarios. The isolated power supply module can be a multi-output DC-DC power supply module. When the isolated power supply module adopts a secondary-side sampling closed-loop control architecture, the feedback circuit 300 can be connected to any secondary-side rectifier circuit.

[0024] like Figure 3 , Figure 4 The figures shown are circuit schematics of the first type of primary-side feedback architecture isolated power supply module and the second type of primary-side feedback architecture isolated power supply module provided in this application. Please refer to [link / reference]. Figure 3 and Figure 4 The primary winding 120 includes a primary main winding and a primary auxiliary winding. The primary main winding is electrically connected to the control chip 110. One end of the primary auxiliary winding is grounded, and the other end of the primary auxiliary winding is electrically connected to the control chip 110 and the feedback circuit 300, respectively.

[0025] Further, please see Figure 3 and Figure 4 The primary circuit 100 also includes a diode D1, the positive terminal of which is electrically connected to the other end of the primary auxiliary winding, and the negative terminal of which is electrically connected to the control chip 110.

[0026] Further, please see Figure 3 The first terminal of the feedback circuit 300 is electrically connected to the positive terminal of the diode D1, and the second terminal of the feedback circuit 300 is electrically connected to the control chip 110.

[0027] Further, please see Figure 4 The first terminal of the feedback circuit 300 is electrically connected to the negative terminal of the diode D1, and the second terminal of the feedback circuit 300 is electrically connected to the control chip 110.

[0028] Specifically, in this embodiment, the primary-side circuit 100 includes a primary-side main winding and a primary-side auxiliary winding. The feedback circuit 300 is connected to the primary-side auxiliary winding to sample the primary-side output voltage. A rectifier diode D1 is also provided between the primary-side auxiliary winding and the control chip 110. The anode of the rectifier diode D1 is connected to the primary-side auxiliary winding, and the cathode of the rectifier diode D1 is connected to the control chip 110. The feedback circuit 300 can be connected to either the anode or the cathode of the rectifier diode D1. When the feedback circuit 300 is connected to the cathode of the rectifier diode D1, the voltage of the primary-side auxiliary winding first passes through the rectifier diode D1 and then through the feedback circuit 300, thereby acquiring the DC level. When the feedback circuit 300 is connected to the anode of the rectifier diode D1, the voltage of the primary-side auxiliary winding directly passes through the feedback circuit 300. Compared to connecting it to the cathode of the rectifier diode D1, this connection method avoids errors introduced by the forward voltage drop Vf of the rectifier diode D1.

[0029] Because this embodiment uses an isolated power supply module with primary-side control, it can detect the current and voltage of the primary winding 120 in real time, thus adapting to a wide range of input voltages. When the input voltage changes, the control chip 110 can automatically adjust the operating state of its internal switching transistors based on primary-side feedback information to ensure stable operation of the power supply module. For example, when the input voltage fluctuates within a large range, the control chip 110 can adjust the ratio of the on-time and off-time of the switching transistors to ensure stable energy transfer in the primary winding 120 of the transformer, thereby keeping the secondary output voltage within the allowable fluctuation range. Furthermore, by employing primary-side sampling closed-loop control and adding an adjustable resistance unit 400, such as... Figure 3 or Figure 4 As shown, the adjustable resistance unit 400 (equivalent to a resistor with a preset resistance value) and the feedback circuit 300 form a voltage divider network. By changing the resistance value of the adjustable resistance unit 400, the voltage division ratio of the voltage divider network can be changed, thereby changing the feedback voltage detected by the control chip 110. Based on the change of this feedback voltage, the control chip 110 adjusts the on-time of the switching transistor, thereby adjusting the output voltage. In this way, only the resistance value of the adjustable resistance unit 400 needs to be adjusted to obtain a wide-range input and wide-range output isolated power supply module; and when the isolated power supply module has multiple outputs, the performance of each output is superior.

[0030] Further, please see Figure 3 and Figure 4 The feedback circuit 300 includes a first resistor and a second resistor. One end of the first resistor is electrically connected to the diode D1, and the other end of the first resistor is electrically connected to one end of the second resistor, the control chip 110, and the resistance adjustable unit 400. The other end of the second resistor is grounded.

[0031] Specifically, in this embodiment, the feedback circuit 300 in the primary-side feedback architecture uses a resistor voltage divider structure to sample the primary-side voltage and form a feedback voltage that is transmitted to the feedback terminal (i.e., FB in the figure) of the control chip 110. After adjustment, the adjustable resistance unit 400 can be equivalent to a resistor with a preset resistance value connected to a second resistor to change the magnitude of the feedback voltage.

[0032] like Figure 5 The diagram shown is a circuit schematic of an isolated power supply module with a secondary-side feedback architecture provided in an embodiment of this application. Figure 5 In the feedback circuit 300, there are a Zener diode 310, an optocoupler 320 and a resistor divider unit 330. The optocoupler is electrically connected to the control chip 110, the Zener diode and the secondary rectifier circuit respectively. The resistor divider unit is electrically connected to the secondary rectifier circuit and the Zener diode respectively. The adjustable resistance unit 400 is electrically connected to the resistor divider unit.

[0033] Specifically, in this embodiment, the feedback circuit 300 in the secondary-side feedback architecture includes an optocoupler, a Zener diode, and a resistor divider unit. The optocoupler can achieve the isolation requirement between the power input terminal and the output terminal, preventing high-voltage side faults from affecting the low-voltage side. The Zener diode can convert the error between the detected output voltage and the set value into a feedback signal, which is transmitted to the control chip 110 of the primary-side circuit 100 through the optocoupler. The control chip 110 controls the conduction time of the main switch according to the change of the feedback voltage, thereby controlling the magnitude of the output voltage.

[0034] Further, please see Figure 5 The voltage divider unit includes a third resistor and a fourth resistor; one end of the third resistor is electrically connected to any secondary rectifier circuit, the other end of the third resistor is electrically connected to the Zener diode, one end of the fourth resistor and the adjustable resistance unit 400, and the other end of the fourth resistor is grounded.

[0035] Specifically, in this embodiment, the resistor voltage divider unit samples the output voltage of the secondary rectifier circuit through two voltage divider resistors. After adjustment, the resistance adjustable unit 400 can be equivalent to a resistor with a preset resistance value connected in parallel with the fourth resistor to change the magnitude of the sampled voltage, thereby changing the magnitude of the feedback signal.

[0036] like Figure 6 The diagram shown is a circuit schematic of an adjustable resistance unit 400 provided in an embodiment of this application. Please refer to [link / reference]. Figure 6 The adjustable resistance unit 400 includes multiple adjustable resistance sub-units, each including a fifth resistor and a switching device. One end of the fifth resistor is electrically connected to the feedback circuit 300, and the other end is electrically connected to the first end of the switching device. The second end of the switching device is grounded, and the third end of the switching device is used for electrical connection to an external control unit. The switching device includes any one of the following: a MOSFET or an IGBT.

[0037] Specifically, in this embodiment, the adjustable resistance unit 400 may be composed of multiple adjustable resistance sub-units. Each adjustable resistance sub-unit includes a switching device and a fifth resistor. According to the actual adjustment needs, the corresponding switching device can be set to the on state, thereby connecting the fifth resistor connected to the switching device to realize the adjustment of the output resistance value.

[0038] The isolated power supply module provided in this embodiment adds an adjustable resistance unit to the feedback circuit. This adjustable resistance unit can be a single resistor with a preset resistance value or a unit containing multiple selectively connected resistors. By adjusting a single structure, a wide-range voltage adaptive function is achieved, enabling the conversion of a single standardized power supply into multiple output voltage specifications. This optimizes the efficiency of large-scale production and significantly reduces the overall operating costs of production management and warehousing logistics. Furthermore, it achieves excellent voltage compatibility performance while maintaining system simplicity. Simultaneously, when the isolated power supply module has multiple outputs, if a primary-side sampling closed-loop control architecture is adopted, its output voltage can be adjusted simultaneously. The voltage regulation accuracy of each output is relatively good, reaching within 4%, and the cross-regulation and linear regulation rates are maintained within a good range, ensuring the stability and reliability of the power supply module.

[0039] It should be noted that the various embodiments in this utility model are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0040] It should also be noted that, in the present invention, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0041] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined in the present invention may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An isolated power supply module, characterized in that, include: The circuit includes a primary circuit, a secondary circuit, a feedback circuit, and an adjustable resistance unit. The primary circuit includes a control chip and a primary winding, and the secondary circuit includes at least one secondary rectifier circuit. The feedback circuit is electrically connected to the primary winding and the control chip respectively, or the feedback circuit is electrically connected to any secondary rectifier circuit and the control chip respectively, and the adjustable resistance unit is electrically connected to the feedback circuit.

2. The isolated power supply module according to claim 1, characterized in that, The primary winding includes a primary main winding and a primary auxiliary winding. The primary main winding is electrically connected to the control chip. One end of the primary auxiliary winding is grounded, and the other end of the primary auxiliary winding is electrically connected to the control chip and the feedback circuit, respectively.

3. The isolated power supply module according to claim 2, characterized in that, The primary circuit also includes a diode, the positive terminal of which is electrically connected to the other end of the primary auxiliary winding, and the negative terminal of which is electrically connected to the control chip.

4. The isolated power supply module according to claim 3, characterized in that, The first terminal of the feedback circuit is electrically connected to the positive terminal of the diode, and the second terminal of the feedback circuit is electrically connected to the control chip.

5. The isolated power supply module according to claim 3, characterized in that, The first terminal of the feedback circuit is electrically connected to the negative terminal of the diode, and the second terminal of the feedback circuit is electrically connected to the control chip.

6. The isolated power supply module according to claim 4 or 5, characterized in that, The feedback circuit includes a first resistor and a second resistor. One end of the first resistor is electrically connected to a diode, and the other end of the first resistor is electrically connected to one end of the second resistor, the control chip, and the adjustable resistance unit. The other end of the second resistor is grounded.

7. The isolated power supply module according to claim 1, characterized in that, The feedback circuit includes a Zener diode, an optocoupler, and a resistor divider unit. The optocoupler is electrically connected to the control chip, the Zener diode and the secondary rectifier circuit respectively. The resistor voltage divider unit is electrically connected to the secondary rectifier circuit and the Zener diode respectively. The adjustable resistance unit is electrically connected to the resistor voltage divider unit.

8. The isolated power supply module according to claim 7, characterized in that, The voltage divider unit includes a third resistor and a fourth resistor; One end of the third resistor is electrically connected to any secondary rectifier circuit, and the other end of the third resistor is electrically connected to the Zener diode, one end of the fourth resistor, and the adjustable resistance unit, respectively. The other end of the fourth resistor is grounded.

9. The isolated power supply module according to any one of claims 1 to 8, characterized in that, The adjustable resistance unit includes multiple adjustable resistance sub-units, and each adjustable resistance sub-unit includes a fifth resistor and a switching device; One end of the fifth resistor is electrically connected to the feedback circuit, the other end of the fifth resistor is electrically connected to the first end of the switching device, the second end of the switching device is grounded, and the third end of the switching device is used for electrical connection to an external control unit.

10. The isolated power supply module according to claim 9, characterized in that, The switching device includes any one of the following: MOSFET or IGBT.

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