DC conversion circuit and DC conversion chip

Abstract

The utility model discloses a direct-current conversion circuit and a direct-current conversion chip, relates to the technical field of power conversion, and discloses the direct-current conversion circuit which comprises a voltage output end and an adjustable voltage module connected to the voltage output end. The first voltage end of the adjustable voltage module is connected to the feedback voltage end of the direct current conversion circuit, and the adjustable voltage module is used for reducing the feedback voltage on the feedback voltage end according to the internal resistance value so as to reduce the output voltage on the voltage output end. According to the invention, the adjustable voltage module is connected between the voltage output end and the feedback voltage end of the DC conversion circuit, and the feedback voltage output by the feedback voltage end is reduced through the adjustable voltage module, so that the output end on the voltage output end is reduced, and the demand of the core working voltage of the DSP can be met. And meanwhile, redesign of an internal conversion circuit of the direct current conversion circuit is avoided, and increase of design cost is avoided.

Description

Technical Field

[0001] The present application relates to the field of power conversion technology, and in particular to a DC conversion circuit and a DC conversion chip. Background Art

[0002] The lower the core operating voltage of the DSP (Digital Signal Processor), the more difficult the corresponding design of the DC conversion chip is. Currently, the feedback voltage of conventional DC conversion chips is generally 0.6V~0.8V, and the lowest output voltage output to the DSP is greater than 0.6V, which can meet the needs of DSPs with 16nm and 7nm processes.

[0003] However, DSPs with 5nm or even 3nm processes have appeared, and their corresponding core operating voltages are further reduced. In order to enable the DC conversion chip to output the output voltage that meets the requirements of DSPs with 5nm or even 3nm processes, the internal conversion circuit of the DC conversion chip needs to be redesigned, which greatly increases the design cost of the DC conversion chip. Utility Model Content

[0004] The main purpose of the present application is to provide a DC conversion circuit and a DC conversion chip, aiming to solve the technical problem of avoiding an increase in the design cost of the DC conversion chip while enabling the output voltage of the DC conversion chip to meet the DSP core operating voltage requirement.

[0005] To achieve the above-mentioned purpose, the present application proposes a DC conversion circuit, which includes a voltage output terminal and an adjustable voltage module connected to the voltage output terminal;

[0006] The first voltage terminal of the adjustable voltage module is connected to the feedback voltage terminal of the DC conversion circuit, and is used to reduce the feedback voltage on the feedback voltage terminal according to the internal resistance value, thereby reducing the output voltage on the voltage output terminal.

[0007] In one embodiment, the adjustable voltage module includes a voltage regulating unit and a voltage lowering unit;

[0008] The voltage pull-down unit is connected to the voltage output terminal, and the voltage regulating unit is connected between the feedback voltage terminal and the voltage pull-down unit;

[0009] A voltage regulating unit, used for adjusting a pull-down voltage value on the voltage pull-down unit;

[0010] The voltage lowering unit is used to lower the output voltage according to the lowering voltage value.

[0011] In one embodiment, the voltage regulating unit includes a first resistor;

[0012] The first end of the first resistor is connected to the feedback voltage end.

[0013] In one embodiment, the voltage regulating unit further includes a first transistor;

[0014] The control end of the first transistor is connected to the second end of the first resistor, and the input end of the first transistor is connected to the voltage input end.

[0015] In one embodiment, the voltage regulating unit further includes a first diode;

[0016] The anode of the first diode is connected to the voltage input terminal, and the cathode of the first diode is connected to the input terminal of the first transistor.

[0017] In one embodiment, the voltage pull-down unit includes a second resistor;

[0018] A first end of the second resistor is connected to the output end of the first transistor, and a second end of the second resistor is connected to the ground.

[0019] In one embodiment, the voltage pull-down unit further includes a third resistor;

[0020] A first end of the third resistor is connected to a connection point between the second resistor and the first transistor, and a second end of the third resistor is connected to the voltage output terminal.

[0021] In one embodiment, the DC conversion circuit further includes a filtering module;

[0022] The filter module is connected to the voltage output terminal and is used for filtering the output voltage.

[0023] In one embodiment, the filtering module includes a first capacitor;

[0024] A first end of the first capacitor is connected to the voltage output end, and a second end of the first capacitor is connected to the ground end.

[0025] In addition, to achieve the above-mentioned purpose, the present application also provides a DC conversion chip, the DC conversion chip includes the DC conversion circuit as described above, the DC conversion circuit includes a voltage output terminal and an adjustable voltage module connected to the voltage output terminal;

[0026] The first voltage terminal of the adjustable voltage module is connected to the feedback voltage terminal of the DC conversion circuit, and is used to reduce the feedback voltage on the feedback voltage terminal according to the internal resistance value, thereby reducing the output voltage on the voltage output terminal.

[0027] One or more technical solutions proposed in this application have at least the following technical effects:

[0028] A DC conversion circuit is proposed, which includes a voltage output terminal and an adjustable voltage module connected to the voltage output terminal; the first voltage terminal of the adjustable voltage module is connected to the feedback voltage terminal of the DC conversion circuit, and is used to reduce the feedback voltage on the feedback voltage terminal according to the internal resistance value, thereby reducing the output voltage on the voltage output terminal. That is, the present application connects an adjustable voltage module between the voltage output terminal and the feedback voltage terminal of the DC conversion circuit, and reduces the feedback voltage outputted by the feedback voltage terminal through the adjustable voltage module, thereby reducing the output terminal on the voltage output terminal, so that it can meet the core operating voltage requirements of the DSP, and at the same time avoids redesigning the internal conversion circuit of the DC conversion circuit, and avoids the increase of design cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0031] Figure 1 This is a schematic diagram of the structure of the DC conversion circuit of this application;

[0032] Figure 2 It is a structural schematic diagram of a conventional DC conversion circuit;

[0033] Figure 3 A schematic diagram of the structure of the DC conversion circuit of this application;

[0034] Figure 4 This is a detailed structural diagram of the DC conversion circuit of this application.

[0035] Figure Number:

[0036] 10. Adjustable voltage module;

[0037] 101, voltage regulating unit; R1, first resistor; Q1, first transistor; D1, first diode;

[0038] 102, voltage pull-down unit; R2, second resistor; R3, third resistor;

[0039] 20. Filter module; C1. first capacitor.

[0040] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0043] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0044] The present application proposes a DC conversion circuit, referring to Figure 1 The DC conversion circuit includes a voltage output terminal and an adjustable voltage module 10 connected to the voltage output terminal. The first voltage terminal of the adjustable voltage module 10 is connected to the feedback voltage terminal of the DC conversion circuit, and is used to reduce the feedback voltage on the feedback voltage terminal according to the internal resistance value, thereby reducing the output voltage on the voltage output terminal.

[0045] Depend on Figure 2 As shown in the conventional DC conversion circuit, the voltage output terminal (i.e. Figure 2 Vout in the circuit) and the feedback voltage terminal (i.e. Figure 2 There is only one series voltage divider resistor string (i.e. Figure 2When the voltage value of the feedback voltage output at the feedback voltage terminal is between 0.6V and 0.8V, the voltage across the second resistor in the series voltage divider resistor string is also between 0.6V and 0.8V, making the output voltage at the voltage output terminal (i.e. Figure 2 The minimum Vout' in the circuit can only be above 0.6V. If an output voltage lower than 0.6V is to be output, the existing solution is to redesign the internal conversion circuit of the DC conversion circuit to output a lower feedback voltage. However, this solution has the problem of increased design cost.

[0046] In order to output a lower output voltage to meet the core operating voltage requirement of DSP without the high design cost caused by redesigning the internal conversion circuit of the DC conversion circuit, the present application proposes connecting an adjustable voltage module 10 to the voltage output end of the DC conversion circuit, and lowering the feedback voltage on the feedback voltage end of the DC conversion circuit through the adjustable voltage module 10, thereby lowering the output voltage.

[0047] That is, only the voltage output terminal of the DC conversion circuit (i.e. Figure 1 Vout in the circuit) and the feedback voltage terminal (i.e. Figure 1 By connecting the adjustable voltage module 10 proposed in the present application between the FB in the circuit, the output voltage (i.e., Figure 1 Vout' in.

[0048] Specifically, refer to Figure 3 As shown, the adjustable voltage module 10 includes a voltage regulating unit 101 and a voltage lowering unit 102. The voltage lowering unit 102 is connected to the voltage output terminal (i.e. Figure 3 The voltage regulating unit 101 is connected to the feedback voltage terminal (i.e. Figure 3 The voltage adjustment unit 101 is used to adjust the pull-down voltage value on the voltage pull-down unit 102, and the voltage pull-down unit 102 is used to adjust the output voltage (i.e. Figure 3 Vout' in the circuit is pulled low.

[0049] The adjustable voltage module 10 in this embodiment includes a voltage regulating unit 101 and a voltage lowering unit 102. The voltage regulating unit 101 can adjust the lower voltage value on the voltage lowering unit 102, and the voltage lowering unit 102 is used to lower the output voltage according to the lower voltage value.

[0050] Depend on Figure 3It can be seen that the output voltage value at the voltage output terminal is related to the feedback voltage at the feedback voltage terminal. When the feedback voltage decreases, the output voltage also decreases. Therefore, the feedback voltage is pulled down by the voltage regulating unit 101, thereby controlling the voltage lowering unit 102 to lower the output voltage, thereby achieving the effect of lowering the output voltage without redesigning the internal conversion circuit of the DC conversion circuit.

[0051] Specifically, refer to Figure 4 As shown, the voltage regulating unit 101 includes a first resistor R1, a first end of the first resistor R1 is connected to the feedback voltage end (ie Figure 4 on FB).

[0052] The first resistor R1 included in the voltage regulating unit 101 is arranged on the feedback voltage terminal. By adjusting the resistance value of the first resistor R1 , the feedback voltage outputted from the feedback voltage terminal can be adjusted accordingly.

[0053] Specifically, the higher the resistance of the first resistor R1 is, the lower the voltage value of the feedback voltage will be. When the resistance of the first resistor R1 increases, the current in the voltage regulating unit 101 will decrease, and the current in the voltage regulating unit 101 is the feedback current output by the feedback voltage terminal, so correspondingly, the feedback voltage will also decrease accordingly.

[0054] Furthermore, the voltage regulating unit 101 further includes a first transistor Q1, the control end of the first transistor Q1 is connected to the second end of the first resistor R1, and the input end of the first transistor Q1 is connected to the voltage input end (ie Figure 4 VCC in the .

[0055] The voltage regulation module in this embodiment further includes a first transistor Q1, which is arranged between the first resistor R1 and the voltage input terminal for isolation. It should be noted that the first transistor Q1 in this embodiment is a conduction voltage drop type, and the conduction voltage is about 0.1V.

[0056] When the feedback voltage is applied to the first transistor Q1 through the first resistor R1 at the feedback voltage end, the first transistor Q1 will be turned on, connected to the input voltage on the voltage input end, and the input voltage will be transmitted to the output end of the first transistor Q1. The input voltage will be applied to the output end of the first transistor Q1 together with the voltage drop voltage of the first transistor Q1, so as to adjust the voltage value of the feedback voltage.

[0057] Furthermore, the voltage regulating unit 101 further includes a first diode D1 , an anode of the first diode D1 is connected to the voltage input terminal, and a cathode of the first diode D1 is connected to the input terminal of the first transistor Q1 .

[0058] In order to prevent the input voltage at the input end of the first transistor Q1 from flowing back to the voltage input end, thereby preventing the circuit from being abnormal or damaged.

[0059] Furthermore, the voltage lowering unit 102 includes a second resistor R2 , a first end of the second resistor R2 is connected to the output end of the first transistor Q1 , and a second end of the second resistor R2 is grounded.

[0060] The second resistor R2 is connected to the output end of the first transistor Q1, that is, when the first transistor Q1 is turned on, the input voltage and the voltage drop voltage connected will be applied to the second resistor R2, so as to change the resistance voltage on the second resistor R2 (that is, pull down the voltage value), so that the resistance voltage across the second resistor R2 can be stabilized at the required voltage, so that the output voltage on the voltage output end (that is, Figure 4 Vout' in the circuit is pulled low.

[0061] For example, the voltage value of the feedback voltage outputted at the feedback voltage terminal is 0.6V. Through the adjusted resistance values ​​of the first resistor R1 and the second resistor R2, the resistance voltage on the second resistor R2 is 0.1V. On this basis, the voltage drop voltage of the first transistor Q1 that is turned on, 0.1V, is added. That is, at this time, the resistance voltage of the second resistor R2 can stably operate at about 0.2V. Because the first end of the second resistor R2 is also connected to the voltage output terminal via the third resistor R3, the second resistor R2 can pull down the output voltage on the voltage output terminal, so that the output voltage can be pulled down to above 0.2V, thereby achieving low-cost reduction of the output voltage on the basis of outputting a lower feedback voltage without redesigning the internal conversion circuit of the DC conversion circuit.

[0062] It should be noted that, based on actual application requirements, the resistance value of the first resistor R1, the resistance value of the second resistor R2 and the voltage drop of the first transistor Q1 can be correspondingly replaced to meet the core operating voltage requirements of various DSP processes, reduce the limitations of the use of DC conversion circuits, and improve the flexibility of DSP selection.

[0063] Furthermore, the voltage lowering unit 102 further includes a third resistor R3, a first end of the third resistor R3 is connected to the connection point between the second resistor R2 and the first transistor Q1, and a second end of the third resistor R3 is connected to the voltage output end.

[0064] In addition, the third resistor R3 is used as an output voltage adjustment resistor to adjust the output voltage. When the resistance of the third resistor R3 is changed, the voltage across the resistor R3 will also change accordingly, thereby affecting the output voltage.

[0065] Reference Figure 3As shown, the DC conversion circuit further includes a filter module 20; the filter module 20 is connected to the voltage output terminal and is used to filter the output voltage.

[0066] In order to remove the AC component in the output voltage, reduce or eliminate the pulsating voltage and harmonics in the output voltage and eliminate interference signals, and improve the quality of the output voltage, this embodiment proposes to connect a filter module 20 to the voltage output end, and filter the output voltage output to the DSP through the filter module 20, so as to output a smooth output voltage to the DSP.

[0067] Further, in Figure 4 In the embodiment, the filter module 20 includes a first capacitor C1, a first end of the first capacitor C1 is connected to the voltage output end, and a second end of the first capacitor C1 is connected to the ground end. In this embodiment, the output voltage output to the DSP is filtered by connecting the first capacitor C1 to the voltage output end, thereby filtering harmonics and interference signals in the output voltage, providing a stable output voltage to the DSP, and ensuring the working stability of the DSP.

[0068] The present application also provides a DC conversion chip, the DC conversion chip includes the DC conversion circuit as described above, the DC conversion circuit includes a voltage output terminal and an adjustable voltage module 10 connected to the voltage output terminal;

[0069] The first voltage terminal of the adjustable voltage module 10 is connected to the feedback voltage terminal of the DC conversion circuit, and is used to reduce the feedback voltage on the feedback voltage terminal according to the internal resistance value, thereby reducing the output voltage on the voltage output terminal.

[0070] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A DC conversion circuit, characterized in that: The DC conversion circuit includes a voltage output terminal and an adjustable voltage module connected to the voltage output terminal; The first voltage terminal of the adjustable voltage module is connected to the feedback voltage terminal of the DC conversion circuit, and is used to reduce the feedback voltage on the feedback voltage terminal according to the internal resistance value, thereby reducing the output voltage on the voltage output terminal.

2. The DC conversion circuit according to claim 1, characterized in that: The adjustable voltage module includes a voltage regulating unit and a voltage lowering unit; The voltage lowering unit is connected to the voltage output terminal, and the voltage regulating unit is connected between the feedback voltage terminal and the voltage lowering unit; The voltage adjustment unit is used to adjust the pull-down voltage value of the voltage pull-down unit; The voltage lowering unit is used to lower the output voltage according to the lowering voltage value.

3. The DC conversion circuit according to claim 2, characterized in that: The voltage regulating unit includes a first resistor; The first end of the first resistor is connected to the feedback voltage end.

4. The DC conversion circuit according to claim 3, characterized in that: The voltage regulating unit further includes a first transistor; The control end of the first transistor is connected to the second end of the first resistor, and the input end of the first transistor is connected to the voltage input end.

5. The DC conversion circuit according to claim 4, characterized in that: The voltage regulating unit further includes a first diode; An anode of the first diode is connected to the voltage input terminal, and a cathode of the first diode is connected to the input terminal of the first transistor.

6. The DC conversion circuit according to claim 5, characterized in that: The voltage pull-down unit includes a second resistor; A first end of the second resistor is connected to the output end of the first transistor, and a second end of the second resistor is grounded.

7. The DC conversion circuit according to claim 6, characterized in that: The voltage lowering unit further includes a third resistor; A first end of the third resistor is connected to a connection point between the second resistor and the first transistor, and a second end of the third resistor is connected to the voltage output end.

8. The DC conversion circuit according to claim 7, characterized in that: The DC conversion circuit also includes a filtering module; The filter module is connected to the voltage output terminal and is used for filtering the output voltage.

9. The DC conversion circuit according to claim 8, characterized in that: The filtering module includes a first capacitor; A first end of the first capacitor is connected to the voltage output end, and a second end of the first capacitor is connected to the ground end.

10. A DC conversion chip, characterized in that: The DC conversion chip comprises a DC conversion circuit as claimed in any one of claims 1 to 9.

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