DC-DC power supply device

Abstract

The utility model relates to the field of power supply chips, in particular to a DC-DC power supply device, which comprises a plurality of DC-DC power supply channels and a mode switching unit, the mode switching unit comprises at least one change-over switch, the change-over switch is respectively connected with the corresponding pins of the plurality of DC-DC power supply channels, and the state of the change-over switch is controlled so as to switch the connection of the corresponding pins of the plurality of DC-DC power supply channels; the working mode of the DC-DC power supply device is controlled to be an independent working mode or a parallel working mode. The connection of the corresponding pins of the plurality of DC-DC power supply channels is switched by controlling the state of the change-over switch, so that the working mode of the DC-DC power supply device is controlled to be an independent working mode or a parallel working mode, and therefore, the DC-DC power supply device can be suitable for small-current or large-current application scenes.

Description

Technical Field

[0001] The present application relates to the field of power supply chips, and in particular to a DC-DC power supply device. Background Art

[0002] The DC-DC power supply device has a voltage conversion function and provides DC power to the load.

[0003] Existing DC-DC power supply devices use either standalone or parallel operation modes, but they are not suitable for both low current and high current and low voltage applications. For example, a DC-DC power supply device using standalone operation mode cannot meet the needs of high current and low voltage applications. Utility Model Content

[0004] Based on this, it is necessary to provide a DC-DC power supply device to address the above technical problems.

[0005] The embodiment of the present application provides a DC-DC power supply device, comprising a plurality of DC-DC power supply channels and a mode switching unit;

[0006] The mode switching unit includes at least one switching switch, which is respectively connected to the corresponding pins of the multiple DC-DC power supply channels. The state of the switching switch is controlled to switch the connection of the corresponding pins of the multiple DC-DC power supply channels, so as to control the working mode of the DC-DC power supply device to be an independent working mode or a parallel working mode.

[0007] In some embodiments, the plurality of DC-DC power supply channels include an enable pin, a feedback pin, a soft start pin, a clock pin, a signal pin, and a detection pin; the mode switching unit includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, and a sixth switch;

[0008] When the first switch is connected to the enable pins of the multiple DC-DC power supply channels, the second switch is connected to the feedback pins of the multiple DC-DC power supply channels, the third switch is connected to the soft start pins of the multiple DC-DC power supply channels, the fourth switch is connected to the clock pins of the multiple DC-DC power supply channels, the fifth switch is connected to the signal pins of the multiple DC-DC power supply channels, and the sixth switch disconnects the detection pins of the multiple DC-DC power supply channels, leaving the detection pin of one DC-DC power supply channel connected, the operating mode of the DC-DC power supply device is switched to the parallel operating mode.

[0009] In some embodiments, the DC-DC power supply device includes a plurality of output regulation circuits, and the plurality of DC-DC power supply channels include output pins connected to a load;

[0010] The output regulating circuit is connected to the proximal end and the distal end of the output pin, and is used to collect the proximal voltage of the output pin and regulate it to a preset voltage, and then switch to the distal voltage of the output pin and regulate it to the preset voltage.

[0011] In some embodiments, the output regulation circuit includes a near-remote switching circuit and a multi-stage voltage regulation circuit connected to the near-remote switching circuit;

[0012] The proximal-remote switching circuit is connected to the proximal end and the distal end of the output pin, and is used to collect the proximal voltage of the output pin and adjust it to a preset voltage through the multi-stage voltage regulation circuit, and then switch to the distal voltage of the output pin and adjust it to the preset voltage through the multi-stage voltage regulation circuit.

[0013] In some embodiments, the near-far switching circuit includes a first selection switch;

[0014] The fixed end of the first selection switch is connected to the detection pin of the DC-DC power supply channel, the first switching end of the first selection switch is connected to the proximal end of the output pin, and the second switching end of the first selection switch is connected to the distal end of the output pin.

[0015] In some embodiments, the multi-stage voltage regulation circuit includes a primary voltage regulation circuit and a secondary voltage regulation circuit;

[0016] The primary voltage regulation circuit is connected to the near-end and far-end switching circuit, and is used to perform primary voltage regulation on the near-end voltage or the far-end voltage of the DC-DC power supply channel;

[0017] The secondary voltage regulation circuit is connected to the proximal-remote switching circuit and is used to perform secondary voltage regulation on the proximal voltage or the remote voltage of the DC-DC power supply channel.

[0018] In some embodiments, the primary voltage regulation circuit includes a potentiometer, a first resistor, and a second resistor connected in series; the second resistor is connected in parallel with the DC-DC power supply channel, and the second resistor is also connected to the near-remote switching circuit.

[0019] In some embodiments, the DC-DC power supply device further includes at least one digital-to-analog conversion unit connected to the soft-start pin;

[0020] The digital-to-analog conversion unit is used to control the soft start of the DC-DC power supply channel.

[0021] In some embodiments, the DC-DC power supply device further includes at least one feedforward capacitor connected between the detection pin and the feedback pin.

[0022] In some embodiments, the DC-DC power supply channel includes at least one DC-DC power supply chip.

[0023] Compared with the prior art, the DC-DC power supply device in this technical solution includes multiple DC-DC power supply channels and a mode switching unit. According to the requirements of the application scenario, the state of the switching switch is controlled to switch the connection of the corresponding pins of the multiple DC-DC power supply channels to control the operating mode of the DC-DC power supply device to be an independent operating mode or a parallel operating mode, thereby being applicable to low current or high current application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of a DC-DC power supply device in one embodiment of the present application;

[0025] Figure 2 This is a connection diagram of a mode switching unit in an exemplary embodiment of the present application;

[0026] Figure 3 This is a structural diagram of an output regulation circuit in one embodiment of the present application;

[0027] Figure 4 This is a connection diagram of a digital-to-analog conversion unit in one embodiment of the present application;

[0028] Figure 5 Schematic diagram of the connection of the feedforward capacitor in one embodiment of the present application.

[0029] Among them, 100, DC-DC power supply channel; 200, mode switching unit; 300, load; 410, near-end and far-end switching circuit; 420, first-level voltage regulation circuit; 500, digital-to-analog conversion unit. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0031] Obviously, the drawings described below are merely examples or embodiments of the present application. Those skilled in the art can, without inventive effort, apply the present application to other similar scenarios based on these drawings. Furthermore, it is also understood that, although the effort involved in such a development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, changes in design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as an insufficiency of the content disclosed in this application.

[0032] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in multiple embodiments of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it necessarily refer to independent or alternative embodiments that are mutually exclusive with other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments unless there is a conflict.

[0033] Unless otherwise defined, the technical or scientific terms used in this application should have the ordinary meaning understood by a person of ordinary skill in the technical field to which this application belongs. The words "one", "a", "the" and the like used in this application do not indicate a limit on quantity and may indicate the singular or plural. The terms "include", "comprise", "have" and any variations thereof used in this application are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units that are not listed, or may also include other steps or units that are inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like used in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The word "multiple" used in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, "A and / or B" can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects before and after are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific order for the objects.

[0034] like Figure 1As shown, an embodiment of the present application provides a DC-DC power supply device, including multiple DC-DC power supply channels 100 and a mode switching unit 200. The mode switching unit 200 includes at least one switch, which is respectively connected to corresponding pins of the multiple DC-DC power supply channels 100. The state of the switch is controlled to switch the connection of the corresponding pins of the multiple DC-DC power supply channels 100, thereby controlling the operating mode of the DC-DC power supply device to an independent operating mode or a parallel operating mode.

[0035] In this embodiment, according to the requirements of the application scenario, the state of the switching switch is controlled to switch the connection of the corresponding pins of multiple DC-DC power supply channels, so as to control the working mode of the DC-DC power supply device to be an independent working mode or a parallel working mode, thereby being applicable to low current or high current application scenarios.

[0036] For example, when the DC-DC power supply device is in standalone mode, it outputs a 30A supply current; when it is in parallel mode, it outputs a 60A supply current. To achieve a high level of efficiency for different current load applications, when the load current is only 30A or less, the state of each switch is switched to control the DC-DC power supply device to operate in standalone mode. When the load current exceeds 30A but is less than 60A, the state of each switch is switched to control the DC-DC power supply device to operate in parallel mode, thereby meeting the high load current requirement.

[0037] In some embodiments, the DC-DC power supply channel 100 includes at least one DC-DC power supply chip. When the load current requirement is high, multiple DC-DC power supply chips can be connected in parallel in one DC-DC power supply channel to increase its supply current.

[0038] For example, when two EZ8630IY#7V5PBF DC-DC power supply chips are connected in parallel, the DC-DC power supply channel can output 0.4 to 6V with a maximum current of 30A. When two DC-DC power supply channels are connected in parallel, the output can reach 0.4 to 6V with a maximum current of 60A.

[0039] In some embodiments, the plurality of DC-DC power supply channels include an enable pin, a feedback pin, a slow-start pin, a clock pin, a signal pin, and a detection pin. The mode switching unit includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, and a sixth switch.

[0040] Among them, the feedback pin can be an FB feedback pin or a feedback pin of other forms; the signal pin can be a CMP signal pin or a signal pin of other forms; the detection pin can be a Sense detection pin or a detection pin of other forms.

[0041] The switching switch can be a relay or an optocoupler.

[0042] When the first switch is connected to the enable pins of multiple DC-DC power supply channels, the second switch is connected to the feedback pins of multiple DC-DC power supply channels, the third switch is connected to the soft start pins of multiple DC-DC power supply channels, the fourth switch is connected to the clock pins of multiple DC-DC power supply channels, the fifth switch is connected to the signal pins of multiple DC-DC power supply channels, and the sixth switch disconnects the detection pins of multiple DC-DC power supply channels, leaving the detection pin of one DC-DC power supply channel connected, the operating mode of the DC-DC power supply device is switched to the parallel operating mode.

[0043] On the contrary, when the first switch disconnects the enable pins of the multiple DC-DC power supply channels, the second switch disconnects the feedback pins of the multiple DC-DC power supply channels, the third switch disconnects the soft start pins of the multiple DC-DC power supply channels, the fourth switch disconnects the clock pins of each DC-DC power supply channel, the fifth switch disconnects the signal pins of the multiple DC-DC power supply channels, and the sixth switch connects the detection pins of the multiple DC-DC power supply channels, the operating mode of the DC-DC power supply device switches to the independent operating mode.

[0044] like Figure 2 As shown, taking the DC-DC power supply device including two DC-DC power supply channels (DC-DC power supply channel VS1 and DC-DC power supply channel VS2) as an example, the switching of the working mode of the DC-DC power supply device is described in detail.

[0045] When the DC-DC power supply device needs to be switched to the parallel working mode, the first switch K1 is controlled to connect the enable pins (VS1_EN and VS2_EN) of the two DC-DC power supply channels; the second switch K2 is controlled to connect the feedback pins (VS1_FB and VS2_FB) of the two DC-DC power supply channels; the third switch K3 is controlled to connect the soft start pins (VS1_SS and VS2_SS) of the two DC-DC power supply channels; the fourth switch K4 is controlled to connect the clock pins (VS1_CLK_ The clock pin VS1_CLK_IN of the DC-DC power supply channel VS1 is grounded, and the clock pin VS2_CLK_OUT of the DC-DC power supply channel VS2 is left floating; the fifth switch K5 is controlled to connect the signal pins (VS1_COMP and VS2_COMP) of the two DC-DC power supply channels, and the sixth switch K6 is controlled to disconnect the detection pin (VS2_SNS) of the DC-DC power supply channel VS2, while the detection pin (VS1_SNS) of the DC-DC power supply channel VS1 is connected.

[0046] In some embodiments, a DC-DC power supply device includes multiple output regulation circuits, and multiple DC-DC power supply channels include output pins connected to a load. The output regulation circuits are connected to the proximal and distal ends of the output pins and are configured to collect the proximal voltage of the output pins and regulate it to a preset voltage, then switch to the distal voltage of the output pins and regulate it to the preset voltage.

[0047] Considering that directly using the remote output voltage of the DC-DC power channel to supply the load may cause the voltage to exceed the load's required value, causing damage to the load, in this embodiment, before providing the preset voltage to the load, the DC-DC power channel is controlled to output the preset voltage. After collecting the proximal voltage of the output pin and adjusting it to the preset voltage, the DC-DC power channel provides the voltage to the load, and then collects the remote voltage of the output pin and adjusts it to the preset voltage, thereby ensuring that the output voltage is controllable, measurable, and reliable.

[0048] like Figure 3 As shown, the DC-DC power supply device includes multiple output regulation circuits ( Figure 3 (Only one output regulation circuit is shown in the figure) Each DC-DC power supply channel 100 includes an output pin VOUT connected to a load 300. The output regulation circuit includes a near-remote switching circuit 410 and a multi-stage voltage regulation circuit connected to the near-remote switching circuit. The near-remote switching circuit 410 is connected to the near and far ends of the output pins. It is used to collect the near-end voltage of the output pin, regulate it to a preset voltage through the multi-stage voltage regulation circuit, and then switch it to the far-end voltage of the output pin and regulate it to the preset voltage through the multi-stage voltage regulation circuit.

[0049] The near-far switching circuit 410 includes a first selection switch S1. A fixed end of the first selection switch S1 is connected to a detection pin of the DC-DC power supply channel 100, a first switching end of the first selection switch S1 is connected to a near-end of an output pin, and a second switching end of the first selection switch S1 is connected to a far-end of the output pin.

[0050] By controlling the first selection switch S1 , the connection between the proximal end and the distal end of the output pin can be switched.

[0051] In some embodiments, when the first selection switch S1 is turned on at the remote end of the output pin, a differential amplifier may be connected in series in the turned-on loop to perform differential amplification on the collected remote voltage.

[0052] The multi-stage voltage regulating circuit includes a primary voltage regulating circuit 420 and a secondary voltage regulating circuit ( Figure 3 The primary voltage regulating circuit 420 is used for coarse adjustment of the output voltage of the DC-DC power supply channel, and the secondary voltage regulating circuit is used for fine adjustment of the output voltage of the DC-DC power supply channel.

[0053] Among them, the first-level voltage regulation circuit 420 is connected to the near-end and far-end switching circuit, and is used to perform first-level voltage regulation, i.e., coarse regulation, on the near-end voltage or far-end voltage of the DC-DC power supply channel 100; the second-level voltage regulation circuit is connected to the near-end and far-end switching circuit, and is used to perform second-level voltage regulation, i.e., fine regulation, on the near-end voltage or far-end voltage of the DC-DC power supply channel.

[0054] The voltage regulation method of the multi-stage voltage regulator circuit can be selected based on the load's requirements for power supply voltage accuracy. For example, when the load has low requirements for power supply voltage accuracy, only a single-stage voltage regulator circuit can be used for coarse adjustment. When the load has high requirements for power supply voltage accuracy, a single-stage voltage regulator circuit can be used for coarse adjustment first, followed by a two-stage voltage regulator circuit for fine adjustment.

[0055] Specifically, the primary voltage regulation circuit 420 includes a potentiometer, a first resistor R1 , and a second resistor R2 connected in series; the second resistor R2 is connected in parallel with the DC-DC power supply channel, and the second resistor R2 is also connected to the near-remote switching circuit 410 .

[0056] The potentiometer has an adjustable resistor RL inside, and the internal resistance of the DC-DC power supply channel is Rb. By adjusting the adjustable resistor RL, the ratio between the equivalent resistance of the resistor Rb and the second resistor R2 and the equivalent resistance of the adjustable resistor RL and the first resistor R1 is adjusted, thereby achieving coarse adjustment of the near-end voltage or the far-end voltage.

[0057] In some embodiments, the secondary voltage regulation circuit uses the internal IIC voltage regulation method of the DC-DC power supply chip.

[0058] The DC-DC power supply chip has a controllable current source (IDAC) inside, with 128 adjustable levels in both the positive and negative directions, for a total of 256 levels, corresponding to 256 codes. Assuming the voltage value corresponding to each level is 10mV, this meets the design requirement of a voltage regulation accuracy of 10mV. The 256 codes enable at least a fine voltage adjustment range of ±1.25V based on coarse adjustment. The number of codes increases with the addition of parallel DC-DC power supply chips, with each additional DC-DC power supply chip adding 256 codes. Therefore, as the number of DC-DC power supply chips increases, the adjustable voltage range also increases.

[0059] In existing technology, the power-on slow-start function of a DC-DC power supply chip typically connects a capacitor in parallel to the slow-start pin. This slow-start function is achieved by charging the capacitor through a current source within the DC-DC power supply chip. When the charging voltage is below 0.6V, the voltage at the output of the DC-DC power supply chip equals the voltage at the slow-start pin. When the slow-start pin is charged above 0.6V, the voltage at the output of the DC-DC power supply chip equals the configured voltage. The larger the parallel capacitor, the longer the slow-start time.

[0060] Considering that the parallel capacitor cannot be adjusted, the slow start time cannot be adjusted. In some embodiments, Figure 4 As shown, the DC-DC power supply device further includes at least one digital-to-analog conversion unit 500 ( Figure 4 Only one digital-to-analog conversion unit is shown); the digital-to-analog conversion unit 500 is used to control its output voltage to control the soft start of the DC-DC power supply channel 100.

[0061] In this embodiment, the output voltage of the digital-to-analog conversion unit is controlled to control the voltage value of the soft start pin, thereby controlling the start time of the DC-DC power supply channel, thereby achieving adjustable and controllable soft start time.

[0062] Considering the current overshoot when changing from high load to low load, and the current undershoot when changing from low load to high load. Figure 5 As shown, the DC-DC power supply device further includes at least one feedforward capacitor C1 ( Figure 5 Only one feed-forward capacitor C1 is shown in the figure, thereby reducing the current overshoot when changing from high load to low load, reducing the current undershoot when changing from low load to high load, and improving the dynamic response index.

[0063] In addition, in order to improve the dynamic response index, various capacitors used for filtering can be removed from the feedback link where the detection pin is located to ensure that the voltage fluctuation at the remote end can be accurately fed back to the DC-DC power supply channel. At the same time, the anti-interference ability of the signal line connected to the detection pin needs to be considered during layout and wiring, and grounding treatment should be performed to keep it away from interference sources.

[0064] In order to achieve ripple suppression, sufficient capacitance can be added at the load end to achieve the purpose of ripple suppression.

[0065] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The above embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the concept of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be based on the appended claims.

Claims

1. A DC-DC power supply device, characterized in that: Includes multiple DC-DC power supply channels and mode switching units; The mode switching unit includes at least one switching switch, which is respectively connected to the corresponding pins of the multiple DC-DC power supply channels. The state of the switching switch is controlled to switch the connection of the corresponding pins of the multiple DC-DC power supply channels, so as to control the working mode of the DC-DC power supply device to be an independent working mode or a parallel working mode.

2. The DC-DC power supply device according to claim 1, wherein: The plurality of DC-DC power supply channels include an enable pin, a feedback pin, a soft start pin, a clock pin, a signal pin, and a detection pin; the mode switching unit includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, and a sixth switch; When the first switch is connected to the enable pins of the multiple DC-DC power supply channels, the second switch is connected to the feedback pins of the multiple DC-DC power supply channels, the third switch is connected to the soft start pins of the multiple DC-DC power supply channels, the fourth switch is connected to the clock pins of the multiple DC-DC power supply channels, the fifth switch is connected to the signal pins of the multiple DC-DC power supply channels, and the sixth switch disconnects the detection pins of the multiple DC-DC power supply channels, leaving the detection pin of one DC-DC power supply channel connected, the operating mode of the DC-DC power supply device is switched to the parallel operating mode.

3. The DC-DC power supply device according to claim 1, wherein: The DC-DC power supply device includes a plurality of output regulating circuits, and the plurality of DC-DC power supply channels include output pins connected to a load; The output regulating circuit is connected to the proximal end and the distal end of the output pin, and is used to collect the proximal voltage of the output pin and regulate it to a preset voltage, and then switch to the distal voltage of the output pin and regulate it to the preset voltage.

4. The DC-DC power supply device according to claim 3, wherein: The output regulation circuit includes a near-remote switching circuit and a multi-stage voltage regulation circuit connected to the near-remote switching circuit; The proximal-remote switching circuit is connected to the proximal end and the distal end of the output pin, and is used to collect the proximal voltage of the output pin and adjust it to a preset voltage through the multi-stage voltage regulation circuit, and then switch to the distal voltage of the output pin and adjust it to the preset voltage through the multi-stage voltage regulation circuit.

5. The DC-DC power supply device according to claim 4, characterized in that: The near-far switching circuit includes a first selection switch; The fixed end of the first selection switch is connected to the detection pin of the DC-DC power supply channel, the first switching end of the first selection switch is connected to the proximal end of the output pin, and the second switching end of the first selection switch is connected to the distal end of the output pin.

6. The DC-DC power supply device according to claim 4, characterized in that: The multi-stage voltage regulating circuit includes a primary voltage regulating circuit and a secondary voltage regulating circuit; The primary voltage regulation circuit is connected to the near-end and far-end switching circuit, and is used to perform primary voltage regulation on the near-end voltage or the far-end voltage of the DC-DC power supply channel; The secondary voltage regulation circuit is connected to the proximal-remote switching circuit and is used to perform secondary voltage regulation on the proximal voltage or the remote voltage of the DC-DC power supply channel.

7. The DC-DC power supply device according to claim 6, characterized in that: The primary voltage regulation circuit includes a potentiometer, a first resistor, and a second resistor connected in series; the second resistor is connected in parallel with the DC-DC power supply channel, and the second resistor is also connected to the near-remote switching circuit.

8. The DC-DC power supply device according to claim 2, wherein: The DC-DC power supply device further includes at least one digital-to-analog conversion unit connected to the soft-start pin; The digital-to-analog conversion unit is used to control the soft start of the DC-DC power supply channel.

9. The DC-DC power supply device according to claim 2, wherein: The DC-DC power supply device further includes at least one feedforward capacitor connected between the detection pin and the feedback pin.

10. The DC-DC power supply device according to any one of claims 1 to 9, characterized in that: The DC-DC power supply channel includes at least one DC-DC power supply chip.

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