Voltage conversion circuit, power supply device and electric equipment

Abstract

The utility model relates to a voltage conversion circuit, a power supply device and electric equipment. The circuit comprises a control module; a first direct current-direct current converter, wherein the first direct current-direct current converter is connected with the control module; the second direct current-direct current converter is connected with the control module, and the first direct current-direct current converter and the second direct current-direct current converter are connected in parallel; the input end of the first DC-DC converter and the input end of the second DC-DC converter are connected with the same input voltage; the output end of the first direct current-direct current converter and the output end of the second direct current-direct current converter are both connected with the output port; wherein the control module is used for controlling the output power of the first DC-DC converter and the second DC-DC converter. The scheme provided by the utility model has the effects of meeting high-power output and reducing the size and cost of components and parts at the same time.

Description

Technical Field

[0001] The present application relates to the technical field of power supply devices, and in particular to a voltage conversion circuit, a power supply device and an electrical equipment. Background Art

[0002] At present, the existing power supply technology mostly converts voltage through DCDC (direct current-direct current) circuit to achieve DC voltage boost or voltage reduction. When high power output is required, it is necessary to select inductors and MOS tubes (semiconductor field effect transistors) with large current capacity to meet its high power output requirements.

[0003] In the related art, voltage conversion devices use inductors and MOS tubes with large current capacity to achieve high power output, which often leads to a relatively large size of the device, thereby increasing its occupied space and manufacturing cost. Utility Model Content

[0004] The present application is proposed to solve the above-mentioned problem. According to one aspect of the present application, a voltage conversion circuit is provided, the circuit comprising: a control module; a first DC-DC converter, the first DC-DC converter being connected to the control module; a second DC-DC converter, the second DC-DC converter being connected to the control module, the first DC-DC converter and the second DC-DC converter being connected in parallel, and the input end of the first DC-DC converter and the input end of the second DC-DC converter being connected to the same input voltage; an output port, the output end of the first DC-DC converter and the output end of the second DC-DC converter being connected to the output port; wherein the control module is used to control the output power of the first DC-DC converter and the second DC-DC converter.

[0005] Exemplarily, the output port includes a first output port and a second output port, the first output port includes a first port and a second port, and the second output port includes a third port and a fourth port; the first port and the third port are both connected to the first output end of the first DC-DC converter, and the first output end of the second DC-DC converter is connected to the first output end of the first DC-DC converter; the second port is connected to the second output end of the first DC-DC converter, and the fourth port is connected to the second output end of the second DC-DC converter.

[0006] Exemplarily, the control module is provided with a feedback terminal, so as to obtain the sampled voltage and / or sampled current of the first output port and the second output port through the feedback terminal.

[0007] Exemplarily, the first DC-DC converter is connected in parallel with a detection resistor, the two ends of the detection resistor are respectively connected to the first output terminal and the second output terminal of the first DC-DC converter, and the detection resistor is connected to the feedback terminal through a first amplifier so that the control module obtains the voltage of the detection resistor as a sampling voltage of the first output port.

[0008] Exemplarily, the second DC-DC converter is connected to a second sampling resistor, the second sampling resistor is connected to the second output terminal of the second DC-DC converter, and the second sampling resistor is connected to the feedback terminal through a second operational amplifier, so that the control module obtains the current of the second sampling resistor as the sampling current of the second output port.

[0009] Exemplarily, the second operational amplifier includes: a first-level amplifier connected to the second sampling resistor, and a second-level amplifier connected to the first-level amplifier, and the second-level amplifier is connected to the feedback end; the first-level amplifier is used to amplify the electrical signal of the current value of the second sampling resistor, and the second-level amplifier is used to input a current reference value and the current value of the second sampling resistor for comparison and then feed back to the feedback end.

[0010] Exemplarily, the controller is suitable for being configured to: adjust the duty cycle of the first DC-DC converter and / or the second DC-DC converter so that the sampled current of the second output port does not exceed the current reference value.

[0011] Exemplarily, the first DC-DC converter is connected to a first sampling resistor, the first sampling resistor is connected to the second output end of the first DC-DC converter, and the control module is further used to obtain a sampling current of the first sampling resistor.

[0012] Exemplarily, the control module is adapted to be configured in a single-phase interleaved operation mode to provide the same operating frequency for the first DC-DC converter and the second DC-DC converter.

[0013] Exemplarily, the first DC-DC converter is connected in parallel with a first capacitor, and the two ends of the first capacitor are respectively connected to the first output end and the second output end of the first DC-DC converter; the second DC-DC converter is connected in parallel with a second capacitor, and the two ends of the second capacitor are respectively connected to the first output end and the second output end of the second DC-DC converter.

[0014] According to another aspect of the present application, a power supply device is provided, and the power supply device includes the above-mentioned voltage conversion circuit.

[0015] According to another aspect of the present application, an electrical device is provided, wherein the electrical device includes the above-mentioned power supply device.

[0016] The voltage conversion circuit in the present application uses a first DC-DC converter and a second DC-DC converter in parallel, and the same voltage is passed to the two DC-DC converters for voltage conversion, which can effectively increase the output power, thereby avoiding the use of large-volume components to adapt to high-power output, and can effectively reduce the volume occupation and preparation cost. The solution of the present application has the effect of reducing the volume and cost of components while meeting high-power output. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By describing the embodiments of the present application in more detail in conjunction with the accompanying drawings, the above and other purposes, features and advantages of the present application will become more apparent. The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0018] Figure 1 A schematic diagram of a voltage conversion circuit in the related art is shown.

[0019] Figure 2 The structure block diagram of the voltage conversion circuit in the embodiment of the present application is shown.

[0020] Figure 3 A circuit diagram of a voltage conversion circuit in an embodiment of the present application is shown.

[0021] Figure 4 The structural block diagram of the electrical equipment and the power supply device in the embodiment of the present application is shown. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present application more obvious, the example embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application, and it should be understood that the present application is not limited to the example embodiments described herein. Based on the embodiments of the present application described in the present application, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present application.

[0023] like Figure 1As shown, it is a schematic diagram of a voltage conversion circuit in the related art. In the related art, a MOS tube Q1 and a diode D1 are used for voltage conversion, and an inductor L1 is connected in series and a capacitor C1 is connected in parallel in the circuit for circuit protection. When high-power voltage conversion is performed, components with stronger overcurrent capacity need to be used, but at the same time, the volume and cost of the components will increase, and the layout of the circuit is not flexible enough. Based on these problems, the present application is proposed, aiming to reduce the volume occupancy and component cost under the premise of meeting high-power output.

[0024] like Figure 2 As shown, the embodiment of the present application provides a voltage conversion circuit, including: a control module, a first DC-DC converter, a second DC-DC converter, and an output port.

[0025] The first DC-DC converter is connected to the control module; the second DC-DC converter is connected to the control module, the first DC-DC converter and the second DC-DC converter are connected in parallel, and the input end of the first DC-DC converter and the input end of the second DC-DC converter are connected to the same input voltage.

[0026] The output end of the first DC-DC converter and the output end of the second DC-DC converter are both connected to the output port. The control module is used to control the output power of the first DC-DC converter and the second DC-DC converter.

[0027] The voltage conversion circuit in the present application uses a first DC-DC converter and a second DC-DC converter in parallel, and the same voltage is passed to the two DC-DC converters for voltage conversion, which can effectively increase the output power, thereby avoiding the use of large-volume components to adapt to high-power output, and can effectively reduce the volume occupation and preparation cost. The solution of the present application has the effect of reducing the volume and cost of components while meeting high-power output.

[0028] Exemplarily, the control module in the embodiment of the present application is a buck controller, and the buck controller is configured in a single-phase interleaved operation mode to provide the same operating frequency for the first DC-DC converter and the second DC-DC converter.

[0029] like Figure 3As shown, it is a circuit diagram of the voltage conversion circuit in the embodiment of the present application. Exemplarily, the first DC-DC converter (hereinafter referred to as the first DCDC) includes a second MOS tube Q2 and a third MOS tube Q3, and the second DC-DC converter (hereinafter referred to as the second DCDC) includes a fourth MOS tube Q4 and a fifth MOS tube Q5. The input ends of the first DCDC and the second DCDC are both connected to the same input voltage. The positive and negative poles of the input voltage in the figure are represented by B+ and B-. The gates of the second MOS tube Q2-the fifth MOS tube Q5 are all connected to the control module, and the control module is provided with ports connected to each MOS tube respectively (as shown in HO1, LO1, HO2, and LO2 in the figure).

[0030] Exemplarily, the drain of the second MOS tube Q2 in the first DCDC and the drain of the third MOS tube Q3 in the second DCDC are both connected to the positive electrode B+ of the input voltage, the source of the second MOS tube Q2 is connected to the first output end of the first DCDC and the drain of the third MOS tube Q3, and the source of the fourth MOS tube Q4 is connected to the first output end of the second DCDC and the drain of the fifth MOS tube Q5. The source of the third MOS tube Q3 is connected to the second output end of the first DCDC and to the ground line (GND of the first DCDC part in the figure). The source of the fifth MOS tube Q5 is connected to the second output end of the second DCDC and to the ground line (GND of the second DCDC part in the figure), and the fifth MOS tube Q5 is also connected to the negative electrode B- for the input voltage.

[0031] The first DCDC and the second DCDC are respectively connected to a second inductor L2 and a third inductor L3 for storing and releasing electric energy and limiting the current change in the voltage conversion circuit.

[0032] Exemplarily, the output port includes a first output port and a second output port, the first output port includes a first port and a second port (as shown in the figure Vout1 and Vout1-), and the second output port includes a third port and a fourth port (as shown in the figure Vout2 and Vout2-).

[0033] The first port and the third port are both connected to the first output end of the first DCDC, and the first output end of the second DCDC is connected to the first output end of the first DCDC, that is, in the present application, the positive terminals of the first output port and the second output port are common. The second port is connected to the second output end of the first DCDC, and the fourth port is connected to the second output end of the second DCDC. Therefore, the positive terminals of the two output ports are equivalent, and when selecting or confirming the output port, only the output port of the negative terminal needs to be confirmed. By adjusting the duty cycle of the first DCDC and the second DCDC, the first output port and the second output port can have the same or different output powers.

[0034] For example, in the embodiment of the present application, the first DCDC is connected in parallel with a first capacitor Co1, and the two ends of the first capacitor Co1 are respectively connected to the first input end and the second output end of the first DCDC. The second DCDC is connected in parallel with a second capacitor Co2, and the two ends of the second capacitor Co2 are respectively connected to the first output end and the second output end of the second DCDC. The first capacitor Co1 and the second capacitor Co2 can be used to store energy in the voltage conversion circuit and smooth the output voltage, and can also be used to improve the stability of the voltage conversion circuit.

[0035] The control module is provided with a feedback terminal (shown as FB in the figure), which obtains the sampled voltage and / or sampled current of the first output port and the second output port. Exemplarily: it is used to collect the sampled voltage of the first output port and the sampled current of the second output port.

[0036] The first DCDC is connected in parallel with a detection resistor, and the two ends of the detection resistor are respectively connected to the first output end and the second output end of the first DCDC, and the detection resistor is connected to the feedback end through the first amplifier, so that the control module obtains the voltage of the detection resistor as the sampling voltage of the first output port. The detection resistor includes a first resistor R1 and a second resistor R2, and the resistance values ​​of the first resistor R1 and the second resistor R2 can be the same or different, and the first resistor R1 and the second resistor R2 are connected in series to form a detection resistor. Because the two ends of the detection resistor are respectively connected to the first output end and the second output end of the first DCDC, the voltage of the detection resistor can be used as the sampling voltage of the first output port after it is obtained. Exemplarily, the midpoint of the series connection of the first resistor R1 and the second resistor R2 is electrically connected to the positive pole of the first amplifier for transmitting the detection signal, and the electric signal is amplified by the first amplifier and then fed back to the feedback end of the detection module. The first amplifier is an isolation amplifier, which can isolate the circuit part of the detection resistor, prevent signal loss and power waste, and ensure the safe operation of the circuit.

[0037] Exemplarily, the first DCDC is also connected to a first sampling resistor Rs1, and the first sampling resistor is connected to the second output end of the first DCDC. Specifically, one end of the first sampling resistor Rs1 is grounded, and the other end is connected to the second port Vout1-. The control module is also used to be electrically connected to the first sampling resistor Rs1 to obtain the current of the first sampling resistor, thereby obtaining the sampling current of the first output port.

[0038] Exemplarily, the second DCDC is connected to a second sampling resistor Rs2, which is connected to the second output end of the second DCDC. The second sampling resistor Rs2 is connected to the feedback end through a second operational amplifier, so that the control module obtains the current of the second sampling resistor Rs2 as the sampling current of the second output port.

[0039] Wherein, the second operational amplifier includes a two-stage amplifier, which is respectively connected to the second sampling resistor and the second amplifier connected to the first amplifier, and the second amplifier is connected to the feedback end of the control module. The first amplifier is used to amplify the electrical signal of the current value of the second sampling resistor, and the second amplifier is used to input the current reference value (as shown in Vref in the figure) and the current value of the second sampling resistor and then feedback to the feedback end. Wherein the current reference value can be set to the current threshold of the second output port, and the control module can confirm whether the current of the second output port exceeds the threshold after receiving the current reference value and the sampling current. When it is confirmed that the sampling current of the second output port exceeds the threshold, it can be configured to: adjust the duty cycle of the first DCDC and / or the second DCDC, thereby changing the output power of the second output port. So that the current output of the second output port does not exceed the threshold, thereby realizing the constant current output of the second output port. Exemplarily, the power of the first output port is not limited. When the first output port is used for output, constant current output can be used instead of outputting with the maximum power of the first DCDC and the second DCDC, so as to better meet the demand for high-power output. Based on this, the first output port and the second output port have different output schemes, and a reasonable selection can be made based on the above configuration when in use. Exemplarily, the resistance value of the second resistor Rs2 can be greater than the resistance value of the first resistor Rs1.

[0040] Exemplarily, the first output port and the second output port can be configured as DC output ports of different power levels such as a car charger cigarette lighter port, an Anderson port, etc.

[0041] Exemplarily, the control module in the present application adopts peak current mode control for the first DCDC and the second DCDC, not only detecting the feedback signal of the output voltage, but also detecting the current value of the main power circuit (i.e., the first sampling current and the second sampling current mentioned above), to achieve fast transient response and excellent load and line regulation. In the control module, the sampling type II compensation network offsets the load pole and the ESR zero point, leaving sufficient amplitude margin and phase margin to stabilize the output voltage. The control module has a built-in ramp function that can compensate for the insufficient performance of the system when disturbed and maintain loop stability, which is used to address subharmonic oscillation problems in low input voltage applications.

[0042] In the embodiment of the present application, the first DCDC and the second DCDC are turned on and off based on the same enable signal. The output voltage is adjusted based on the same feedback signal, and the soft start sequence and compensation loop are shared. This is used to achieve a high degree of consistency in the output voltage of the two DCDCs, reducing the risk. In addition, in the embodiment of the present application, the control module operates the two DCDC control channels at 180° out of phase, which reduces the capacitor ripple current and minimizes the body diode conduction during the switch switching, thereby reducing the heat loss at high input voltage and high switching frequency and minimizing high-frequency emission, thereby improving thermal performance and anti-interference performance.

[0043] like Figure 4 As shown, the embodiment of the present application also provides an electric device and a power supply device. The electric device includes the power supply device, and the power supply device includes a power supply and the above-mentioned voltage conversion circuit. The power supply provides voltage to the power conversion circuit for voltage conversion, and outputs the voltage through the first output port or the second output port to power the electric device. Exemplarily, the electric device can be an electric car or other equipment, and the direct current provided by the power supply device is used to power the components.

[0044] The electrical equipment and power supply device in the present application adopt the above-mentioned voltage conversion circuit, and the same voltage is passed to the two DCDCs for voltage conversion by connecting the first DCDC and the second DCDC in parallel, which can effectively improve the output power, thereby avoiding the use of large-volume components to adapt to high-power output, and can effectively reduce the volume occupation and preparation cost. The solution of the present application has the effect of reducing the volume and cost of components while meeting high-power output.

[0045] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present application to this. Those of ordinary skill in the art may make various changes and modifications therein without departing from the scope and spirit of the present application. All these changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0046] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0047] Similarly, it should be understood that in order to streamline the present application and help understand one or more of the various inventive aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the present application should not be interpreted as reflecting the following intention: the claimed application requires more features than the features clearly stated in each claim. More specifically, as reflected in the corresponding claims, the inventive point is that the corresponding technical problem can be solved with features less than all the features of a single disclosed embodiment. Therefore, the claims following the specific embodiment are hereby explicitly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present application.

[0048] It will be understood by those skilled in the art that, except for mutually exclusive features, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this specification may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature that provides the same, equivalent or similar purpose.

[0049] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0050] The above is only a specific implementation or description of a specific implementation of the present application, and the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A voltage conversion circuit, characterized in that: The circuit comprises: Control module; a first DC-DC converter, the first DC-DC converter being connected to the control module; a second DC-DC converter, wherein the second DC-DC converter is connected to the control module, the first DC-DC converter and the second DC-DC converter are connected in parallel, and an input end of the first DC-DC converter and an input end of the second DC-DC converter are connected to the same input voltage; an output port, to which an output end of the first DC-DC converter and an output end of the second DC-DC converter are both connected; The control module is used to control the output power of the first DC-DC converter and the second DC-DC converter.

2. The circuit according to claim 1, characterized in that The output port includes a first output port and a second output port, the first output port includes a first port and a second port, and the second output port includes a third port and a fourth port; The first port and the third port are both connected to the first output end of the first DC-DC converter, and the first output end of the second DC-DC converter is connected to the first output end of the first DC-DC converter; the second port is connected to the second output end of the first DC-DC converter, and the fourth port is connected to the second output end of the second DC-DC converter.

3. The circuit according to claim 2, characterized in that The control module is provided with a feedback terminal, so as to obtain the sampled voltage and / or sampled current of the first output port and the second output port through the feedback terminal.

4. The circuit according to claim 3, characterized in that The first DC-DC converter is connected in parallel with a detection resistor, and the two ends of the detection resistor are respectively connected to the first output end and the second output end of the first DC-DC converter. The detection resistor is connected to the feedback end through a first amplifier so that the control module obtains the voltage of the detection resistor as a sampling voltage of the first output port.

5. The circuit according to claim 3, characterized in that The second DC-DC converter is connected to a second sampling resistor, the second sampling resistor is connected to the second output end of the second DC-DC converter, and the second sampling resistor is connected to the feedback end through a second operational amplifier, so that the control module obtains the current of the second sampling resistor as the sampling current of the second output port.

6. The circuit according to claim 5, characterized in that The second operational amplifier includes: a primary amplifier connected to the second sampling resistor, and a secondary amplifier connected to the primary amplifier, wherein the secondary amplifier is connected to the feedback end; the primary amplifier is used to amplify the electrical signal of the current value of the second sampling resistor, and the secondary amplifier is used to input a current reference value and the current value of the second sampling resistor for comparison and then feed back to the feedback end.

7. The circuit according to claim 6, characterized in that The control module is suitable for being configured to: adjust the duty cycle of the first DC-DC converter and / or the second DC-DC converter so that the sampled current of the second output port does not exceed the current reference value.

8. The circuit according to any one of claims 2 to 7, characterized in that: The first DC-DC converter is connected to a first sampling resistor, the first sampling resistor is connected to the second output end of the first DC-DC converter, and the control module is further used to obtain a sampling current of the first sampling resistor.

9. The circuit according to any one of claims 1 to 7, characterized in that: The control module is adapted to be configured in a single-phase interleaved operation mode to provide the first DC-DC converter and the second DC-DC converter with the same operating frequency.

10. The circuit according to any one of claims 1 to 7, characterized in that The first DC-DC converter is connected in parallel with a first capacitor, and two ends of the first capacitor are respectively connected to the first output end and the second output end of the first DC-DC converter; the second DC-DC converter is connected in parallel with a second capacitor, and two ends of the second capacitor are respectively connected to the first output end and the second output end of the second DC-DC converter.

11. A power supply device, characterized in that: The power supply device comprises the voltage conversion circuit according to any one of claims 1-10.

12. An electrical equipment, characterized in that: The electrical equipment includes the power supply device according to claim 11.

Images