Non-isolated circuit

Abstract

The embodiment of the invention provides a non-isolated circuit which comprises a multi-winding inductor, the two ends of the multi-winding inductor are configured to have different potentials, the multi-winding inductor comprises N taps, and the number of turns of coils between each tap and the first end of the multi-winding inductor is different; the first end of each first switch is connected with one tap, different first switches are connected with different taps, the second end of each first switch is used for being connected with a load, and N is an integer larger than or equal to 1. According to the invention, the problems of low multi-path output efficiency and complex control are solved, and the effects of improving the multi-path output efficiency and simplifying the control process are achieved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of power conversion, and in particular to a non-isolated circuit. Background Art

[0002] The multi-output DC / DC converter is easy to use, small in size, and low in cost, so it is widely used. Traditional multi-output requires multiple inputs and multiple power supplies. The single-input multiple-output solution can achieve multiple outputs with only one input, greatly reducing the size and cost. In this application, it is a more optimized solution to adjust the voltage of multiple outputs by only controlling the time-sharing of an inductor to power different outputs in different time periods. The schematic diagram of the non-isolated circuit in the related technology can be found in the attached Figure 1 The duty cycle diagram of each switch in the circuit can be found in the attached Figure 2 , the inductor current IL flowing through L is continuous, and the switch tubes S0, S1, S2, S3, and Sf are continuously turned on, and the duty ratios are D0, D1, D2, D3, and Df respectively. When S0 is turned on, the inductor current increases and the inductor is charged. When S1 to S3 are turned on, the inductor current decreases and the inductor is discharged. When Sf is turned on, the inductor continues to flow and the inductor current remains unchanged. According to the volt-second balance principle, there is the following relationship.

[0003] V in ×D0=V1×D1+V2×D2+V3×D3

[0004] The specific values ​​of D0~D3 are determined by the load size of each channel of V1~V3, that is, the integral of the inductor current IL in D1~D3 needs to meet the load requirements of each channel of V1~V3 in a whole cycle. Its disadvantage is that all output voltages are controlled by the duty cycle, which makes the duty cycle of each channel low, the efficiency is low, and the control is more complicated. The duty cycle needs to take into account the control voltage and load at the same time, and it is difficult for the system to reach a steady state.

[0005] It can be seen from this that the related technology has problems of low multi-channel output efficiency and complex control.

[0006] Currently, no effective solution has been proposed for the above-mentioned problems existing in the related technologies. Summary of the invention

[0007] The embodiment of the present invention provides a non-isolated circuit to at least solve the problems of low multi-channel output efficiency and complex control existing in the related art.

[0008] According to one embodiment of the present invention, a non-isolated circuit is provided, comprising: a multi-winding inductor, wherein the two ends of the multi-winding inductor are configured to have different potentials, the multi-winding inductor comprises N taps, and the number of coil turns between each tap and the first end of the multi-winding inductor is different; N first switches, the first end of each of the first switches is connected to one of the taps, different first switches are connected to different taps, and the second end of each of the first switches is used for connecting to a load, wherein N is an integer greater than or equal to 1.

[0009] According to another embodiment of the present invention, a converter is provided, comprising: the non-isolated circuit as described in the above embodiment.

[0010] According to yet another embodiment of the present invention, there is provided an electronic device, comprising the converter as described in the above embodiment.

[0011] Through the present invention, the two ends of the multi-winding inductor of the non-isolated circuit are configured to have different potentials, the multi-winding inductor includes N taps, and the number of coil turns between each tap and the first end of the multi-winding inductor is different; the first end of each first switch is connected to one of the taps, and different first switches are connected to different taps, and the second end of each first switch is used to connect to the load, wherein N is an integer greater than or equal to 1. Since the number of turns corresponding to each tap is different, the voltage output by each tap is different, thereby achieving output of different voltages; compared with adjusting the output voltage by adjusting the duty cycle, there is no need to control the on-time, which simplifies the control process. In addition, since there is no need to control the on-time, the on-time can be appropriately extended to improve the circuit efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of a non-isolated circuit in the related art;

[0013] Figure 2 It is a schematic diagram of the duty cycle of controlling each switch in the circuit in the related art;

[0014] Figure 3 is a schematic diagram of a non-isolated circuit according to an embodiment of the present invention;

[0015] Figure 4 is a schematic diagram of a single-channel multi-output Boost circuit according to an exemplary embodiment of the present invention;

[0016] Figure 5 is a schematic diagram of a single-channel four-output Boost circuit according to an exemplary embodiment of the present invention;

[0017] Figure 6 is a schematic diagram of a single-input four-output Buck circuit according to an exemplary embodiment of the present invention.

[0018] Figure 7 is a schematic diagram of a single-input multiple-output Buck-Boost circuit according to an exemplary embodiment of the present invention;

[0019] Figure 8 is a schematic diagram of a single-input four-output Buck-Boost circuit according to an exemplary embodiment of the present invention;

[0020] Fig. 9 A single-channel multi-output negative-to-positive Buck-Boost circuit according to an exemplary embodiment of the present invention;

[0021] Fig.10 is a schematic diagram of the working condition of a single-input four-output circuit according to an exemplary embodiment of the present invention;

[0022] Fig.11 is a schematic diagram of the working condition of a single-input four-output circuit when the first switch is a diode according to an exemplary embodiment of the present invention;

[0023] Fig.12 1 is a schematic diagram of the operation of a single-input four-output circuit with independently adjustable output voltages according to an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0024] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and in combination with the embodiments.

[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0026] In this embodiment, a non-isolated circuit is provided, comprising: a multi-winding inductor, wherein two ends of the multi-winding inductor are configured to have different potentials; the multi-winding inductor comprises N taps, and the number of coil turns between each tap and the first end of the multi-winding inductor is different. The non-isolated circuit also comprises N first switches, wherein the first end of each first switch is connected to one of the taps, and different first switches are connected to different taps, and the second end of each first switch is used to connect to a load, wherein N is an integer greater than or equal to 1.

[0027] In this embodiment, the first end and the second end of the multi-winding inductor can be respectively connected to the two ends of the input power supply. Of course, the first end and the second end of the multi-winding inductor can also be respectively connected to devices with different potentials. The embodiment of the present application does not limit this, as long as the first end and the second end of the multi-winding inductor have different potentials.

[0028] In this embodiment, the multi-winding inductor may include N taps, where N is an integer greater than or equal to 1, such as 2, 3, 4, 5, 6, 8, etc. The present invention does not limit the value of N.

[0029] In the above embodiment, the multi-winding inductor can be directly connected to the input power supply or indirectly connected to the input power supply. The first end of the multi-winding inductor can be directly connected to the positive electrode of the input power supply or indirectly connected to the positive electrode of the input power supply.

[0030] In the above implementation, the first switch may include a relay, a single-pole single-throw switch, a diode, a triode, a switch tube, etc. The embodiment of the present application does not limit the first switch as long as it can control the connection between the tap and the corresponding load.

[0031] Attached Figure 3 is a schematic diagram of a non-isolated circuit according to an embodiment of the present invention. Figure 3 As shown, the first end of the multi-winding inductor corresponds to the first potential, and the second end of the multi-winding inductor corresponds to the second potential. The multi-winding inductor includes three taps, each of which is connected to the first capacitor through a first switch. Each first capacitor can be connected to a load, and the attached Figure 3 The load is not shown. The first potential can be a fixed potential or a jump potential. The second potential can be a fixed potential or a jump potential.

[0032] In the non-isolated circuit provided in the embodiment of the present application, the two ends of the multi-winding inductor are configured to have different potentials, the multi-winding inductor includes N taps, and the number of coil turns between each tap and the first end of the multi-winding inductor is different; the first end of each of the first switches is connected to one of the taps, and different first switches are connected to different taps, and the second end of each of the first switches is used to connect to the load, wherein N is an integer greater than or equal to 1. Since the number of turns corresponding to each tap is different, the voltage output by each tap is different, thereby achieving the output of different voltages; compared with adjusting the output voltage by adjusting the duty cycle, there is no need to control the on-time, which simplifies the control process. In addition, since there is no need to control the on-time, the on-time can be appropriately extended to improve the circuit efficiency.

[0033] In an exemplary embodiment, the non-isolated circuit further includes: an input power supply, the input power supply is connected to the first end of the multi-winding inductor; a second switch, the second end of the multi-winding inductor is connected to the load through the second switch, and the second switch is also configured to be connected to the controller and turned on or off according to the control signal sent by the controller. In this embodiment, the non-isolated circuit also includes an input power supply, and the input power supply can be a constant power supply. The input power supply can be directly connected to the first end of the multi-winding inductor, and can also be indirectly connected to the first end of the multi-winding inductor to provide different first points for the first end of the multi-winding inductor. The second end of the multi-winding inductor can be connected to the load through the second switch. That is, the second end of the multi-winding inductor can also be used as an output of the non-isolated circuit. Among them, the second switch can be a relay, a transistor, a switch tube, a bidirectional switch tube, a diode, etc.

[0034] In an exemplary embodiment, the non-isolated circuit further includes a third switch, the second end of the multi-winding inductor is also grounded through the third switch, and the third switch is further configured to be connected to a controller and turned on or off according to a control signal sent by the controller. Figure 4 When the first end of the multi-winding inductor is directly connected to the input power supply, that is, when the first potential of the first end of the multi-winding inductor is a fixed potential and the second end of the multi-winding inductor is grounded through the third switch, the topology is a single-channel multi-output Boost circuit.

[0035] In an exemplary embodiment, the non-isolated circuit receives a first control signal sent by the controller to the third switch; when the first control signal is at a high level, the third switch is turned on, and the first switch and the second switch are turned off; when the first control signal is at a low level, the third switch is turned off, and the controller controls at least one switch included in the first switch and the second switch to be turned on, or controls the switches included in the first switch and the second switch to be turned on in different time periods. In this embodiment, the turning on and off of the switches included in the non-isolated circuit can be controlled by the controller. The controller can send a first control signal to the third switch to set a duty cycle for the third switch. When the first control signal is at a high level, the third switch is turned on, and the first switch and the second switch are turned off. When the first control signal is at a low level, the third switch is turned off, and the switches in the first switch and the second switch can be turned on at the same time, or one of the switches is turned on and the other switches are turned off. The switches in the first switch and the second switch can be partially turned on at the same time, and partially turned off at the same time. The switches in the first switch and the second switch can also be controlled independently, that is, the switches in the first switch and the second switch can be turned on or off in different time periods.

[0036] In the above embodiment, the single-channel four-output Boost circuit can be seen in the attached Figure 5 ,like Figure 5 As shown, this circuit is a boost circuit. The input Vin always charges the inductor, and the switch determines the discharge time of the inductor to the output to achieve a boosted output. The rules that need to be met when this circuit works are:

[0037] 1. At least one switch is in the on state at the same time (one of Q1, S1~S4);

[0038] 2. When Q1 is turned on, S1~S4 are all in the off state;

[0039] 3. Any of the tubes S1 to S4 can be opened and closed at the same time, or opened independently, so as to realize the mutual correlation or independent adjustment of Vo1 to Vo4.

[0040] In an exemplary embodiment, the non-isolated circuit further includes: a fourth switch, wherein the input power supply is connected to the first end of the multi-winding inductor via the fourth switch, and the fourth switch is further configured to be connected to a controller and turned on or off according to a control signal sent by the controller; a diode, wherein the cathode of the diode is connected to the first end of the multi-winding inductor, and the anode of the diode is grounded. In this embodiment, the fourth switch may be a switch tube, a bidirectional switch tube, etc. When the fourth switch is turned on, the potential of the first end of the multi-winding inductor is a fixed potential, and when the fourth switch is turned off, the potential of the first end of the multi-winding inductor is 0. Therefore, the potential jump of the first end of the multi-winding inductor can be achieved by the on-off state of the fourth switch. Please refer to the attached Figure 6 ,like Figure 6 As shown, the first end of the multi-winding inductor is connected to the input power supply through the fourth switch, that is, the switch tube Q1, the cathode of the diode D1 is connected to the first end of the multi-winding inductor, and the anode of the diode is grounded. When the fourth switch is turned on, the multi-winding inductor is charged, and when the fourth switch is turned off, the multi-winding inductor is discharged. By setting a diode, the unidirectional conduction of the multi-winding inductor can be achieved, so that the multi-winding inductor supplies power to the load. The second end of the multi-winding inductor can be connected to the load through the second switch S1. The fourth switch can be controlled by the controller to supply power to the load or stop supplying power according to the control signal of the controller.

[0041] In an exemplary embodiment, the non-isolated circuit receives a second control signal sent by the controller to the fourth switch; when the second control signal is at a high level, the fourth switch is turned on, and the controller controls at least one switch included in the first switch and the second switch to be turned on or off, or the controller controls the switches included in the first switch and the second switch to be turned on in different time periods; when the second control signal is at a low level, the fourth switch is turned off, and the controller controls at least one switch included in the first switch and the second switch to be turned on or off, or the controller controls the switches included in the first switch and the second switch to be turned on in different time periods. In this embodiment, the on and off of the fourth switch can be controlled by the controller to achieve a jump of the first potential of the first end of the multi-winding inductor. When the first potential of the first end of the multi-winding inductor is a jump potential, and the second potential of the multi-winding inductor is connected to the load through the second switch, the topology is a single-input multiple-output Buck circuit. Figure 6 This is a single-input, four-output Buck circuit. This is a step-down circuit. The inductor always discharges to the output. The switch is used to control the time for Vin to charge the inductor to achieve a step-down output. The rules that need to be met during operation are:

[0042] 1. At least one switch is in the on state (one of S1 to S4) at the same time;

[0043] 2. Any of the tubes S1 to S4 can be opened and closed at the same time, or opened independently, so as to realize the mutual correlation or independent adjustment of Vo1 to Vo4.

[0044] In an exemplary embodiment, the non-isolated circuit further includes: a fourth switch, through which the input power source is connected to the first end of the multi-winding inductor, and the fourth switch is further configured to be connected to a controller and turned on or off according to a control signal sent by the controller; a diode, a cathode of the diode is connected to the first end of the multi-winding inductor, and an anode of the diode is grounded. In this embodiment, the first end of the multi-winding inductor is connected to the input power source through the fourth switch, and the second end of the multi-winding inductor is grounded through the third switch. Figure 7 , the first potential of the first end of the multi-winding inductor is a jump potential, the second end of the multi-winding inductor is grounded through the third switch, and the second end of the multi-winding inductor is also connected to the load through the second switch. The topology is a single-input multi-output Buck-Boost circuit.

[0045] In an exemplary embodiment, the non-isolated circuit receives a second control signal sent by the controller to the fourth switch; when the second control signal is at a high level, the fourth switch is turned on, and the controller controls at least one switch included in the first switch and the second switch to be turned on or off, or the controller controls the switches included in the first switch and the second switch to be turned on in different time periods; when the second control signal is at a low level, the fourth switch is turned off, and the controller controls at least one switch included in the first switch and the second switch to be turned on or off, or the controller controls the switches included in the first switch and the second switch to be turned on in different time periods.

[0046] In the above embodiment, the schematic diagram of the single-input four-output Buck-Boost circuit can be found in the attached Figure 8 ,like Figure 8 As shown, Q2 is the fourth switch, Q1 is the third switch, S1 is the second switch, and S2-S4 are the first switches. This is a buck-boost circuit. The opening of Q2 determines the time for the input voltage Vin to charge the inductor L, and the closing of Q1 determines the time for the inductor L to discharge the output voltage, so as to achieve buck-boost voltage regulation. The rules to be met during operation are:

[0047] 1. At least one switch is in the on state at the same time (one of Q1, S1~S4);

[0048] 2. When Q1 is turned on, S1~S4 are all in the off state;

[0049] 3. Any of the tubes S1 to S4 can be opened and closed at the same time, or opened independently, so as to realize the mutual correlation or independent adjustment of Vo1 to Vo4.

[0050] In an exemplary embodiment, the non-isolated circuit further includes a fifth switch, the second end of the multi-winding inductor is connected to the input power supply through the fifth switch, the first end of the multi-winding inductor is grounded, and the fifth switch is further configured to be connected to a controller and turned on or off according to a control signal sent by the controller. In this embodiment, see the attached Fig. 9 ,like Fig. 9 As shown, the second end of the multi-winding inductor is connected to the input power supply through the fifth switch Q1, and the first end of the multi-winding inductor is grounded. At this time, the first potential of the first end of the multi-winding inductor is a fixed potential of 0V, and the second potential of the second end of the multi-winding inductor is a jump potential. This topology is a single-channel multi-output negative-to-positive Buck-Boost circuit.

[0051] In an exemplary embodiment, the non-isolated circuit receives a fifth control signal sent by the controller to the fifth switch; when the fifth control signal is at a high level, the fifth switch is turned on, and the controller controls the first switch and the second switch to be turned off; when the fifth control signal is at a low level, the fifth switch is turned off, and the controller controls at least one of the first switch and the second switch to be turned on, or the controller controls the switches included in the first switch and the second switch to be turned on in different time periods.

[0052] In the above embodiment, the basic principle of negative-to-positive conversion is to achieve mutually opposite input and output voltages by switching between Q1 conduction (reverse charging the inductor through -Vin) and S1 conduction (discharging the inductor to the output Vo).

[0053] The present invention can realize single-input four-output negative-to-positive conversion by using multiple windings and multiple taps on the inductor. Compared with the transformer solution with multiple windings, the primary winding can be omitted, the cost and volume of the magnetic components can be reduced, and the corresponding winding loss can be reduced.

[0054] The circuit includes input voltage Vin, output voltages Vo1, Vo2, Vo3, and Vo4. Its internal circuit includes a main power tube Q1, 4-way switches S1, S2, S3, and S4, and a main inductor, i.e., a multi-winding inductor L. The main inductor is composed of multiple windings, with a total number of turns of N, of which the number of turns between Va and Vb is n1, the number of turns between Vb and Vc is n2, the number of turns between Vc and Vd is n3, and the number of turns between Vd and ground is n4 (the ratio of n1 to n4 is not fixed, and can be set in advance according to the voltage requirements of the multi-way output voltage), and N = n1 + n2 + n3 + n4.

[0055] For S1~S4, any tube can be turned on and off at the same time. The following is an explanation with two examples of control schemes: Example 1: S1~S4 are all turned on and off at the same time. In this case, S1~S4 can also be replaced by diodes; Example 2: S1 and S2 are turned on and off at the same time, and S3 and S4 are turned on independently.

[0056] Example 1:

[0057] The working diagram of the single-input four-output circuit in one switching cycle can be found in the attached figure. Fig.10 , the specific working modes are as follows:

[0058] When the fifth switch Q1 is turned on, the input voltage Vin charges the multi-winding inductor L, and the inductor current flows through Q1, and Iq continues to rise, and its rising slope is determined by the input voltage Vin and the size of the inductor L. Then Q1 is turned off, and S1~S4 are turned on. At the moment S1~S4 is turned on, the sum of the energy flowing through the inductor L by I1~I4 is equal to the energy flowing through L by Iq when Q1 is turned off. Then the inductor L starts to discharge and outputs the four paths Vo1~Vo4.

[0059] In this process, by utilizing the principle that the voltage ratio at both ends of the inductor winding is equal to the ratio of the number of winding turns, during the conduction phase of the switch tubes S1 to S4, the voltage sizes of Vo1 to Vo4 can satisfy the proportional relationship of Vo1:Vo2:Vo3:Vo4=N:(N-n1):(n3+n4):n4.

[0060] At this time, the four currents I1 to I4 of S1 to S4 continue to decrease, and the current decrease slopes of I1 to I4 are consistent and are determined by the output voltage Vo1 and the size of the inductor L.

[0061] The current waveforms of I1~I4 are determined by the load size of Vo1~Vo4. When the load is small, the current waveforms of I1~I4 may be negative (such as Fig.10 3 and I4 in the example above).

[0062] When S1~S4, i.e. the first switch and the second switch are both diodes, there is no need to control their on and off. The working diagram of the single-input four-output circuit can be found in the attached figure. Fig.11 Since the diodes are used instead, the current waveforms of I1 to I4 cannot be negative. When the loads of Vo3 and Vo4 are small, the following will occur: Fig.11 The I3 current shown is always zero, and the I4 current drops to zero in advance.

[0063] In this working mode, let the duty cycle of Q1 (the conduction time in one cycle) be Dq, and the duty cycle of S1 to S4 is complementary to Q1, which is (1-Dq). The output voltage of Vo1 to Vo4 can be increased by increasing Dq, and vice versa. According to the volt-second balance principle of inductance, in steady state, Vin*Dq=Vo1*(1-Dq).

[0064] In summary, the output effects that can be achieved in this embodiment are: Vo1 = Vin*Dq / (1-Dq), Vo2 = Vo1*(N-n1) / N, Vo3 = Vo1*(n3+n4) / N, Vo4 = Vo1*n4 / N. Therefore, the size of Vo1 to Vo4 can be adjusted by adjusting Dq.

[0065] Example 2: To achieve independent adjustment of Vo3~Vo4, the following solution can also be used. The working diagram of the single-input four-output circuit with independent adjustable output voltage can be found in the attached Fig.12 . This solution can independently adjust the size of Vo3 and Vo4 without being affected by Vo1 and Vo2. In this embodiment, by turning on S3 and S4 at different times, the size of the transferred energy is adjusted by the length of the conduction time, thereby realizing multi-channel output voltage regulation. The turn ratio of a part of the inductor can be used to adjust the output voltage, reduce the need for conduction time adjustment, increase the conduction time of each channel, and improve the overall efficiency.

[0066] See also Figure 8 and Fig.12 , when Q1 is turned on, the input voltage Vin charges the inductor L, the inductor current flows through Q1, rising continuously, and the inductor stores energy. Then Q1 is turned off, and S1 and S2 are turned on. S3 and S4 are in the off state. At this time, the inductor energy is released to Vo1 and Vo2 through S1 and S2 to maintain their voltage. At this time, Vo1 and Vo2 are the same as in Example 1, and conform to the proportional relationship, Vo1:Vo2=N:(N-n1). The voltage and load of Vo3 and Vo4 are maintained by their output capacitors. Then S1 and S2 are turned off, and S3 is turned on. At this time, the inductor energy is released to Vo3 through S3 to maintain its voltage. The voltage and load of Vo1, Vo2, and Vo4 are maintained by their output capacitors. Then S3 is turned off, and S4 is turned on. At this time, the inductor energy is released to Vo4 through S4 to maintain its voltage. The voltage and load of Vo1, Vo2, and Vo3 are maintained by their output capacitors.

[0067] Since S1 and S2 are always turned on at the same time, Vo1 and Vo2 are proportional, Vo1:Vo2=N:(N-n1). S3 and S4 are turned on independently, so Vo3 and Vo4 can be adjusted independently. The size of Vo3 and Vo4 can be adjusted by the on-time of S3 and S4. In the actual control process, if the output voltage of a certain path is low, the output voltage of this path can be increased by reducing the on-time of this switch. Vice versa.

[0068] In the above embodiment, under the premise of keeping the output voltages of Vo1 and Vo2 unchanged, the magnitudes of Vo3 and Vo4 can be independently adjusted by time-sharing conduction of S3 and S4. Similarly, independent adjustment of Vo1 to Vo4 can be achieved by time-sharing conduction of S1 to S4.

[0069] In summary, through the method of Example 2, it can be achieved that Vo1~Vo4 are partially independently adjustable and partially interrelated. The advantage of interrelatedness is that multiple channels can transmit energy at the same time, and the energy transmission efficiency is higher, while independent adjustment can make the output more flexible. You can make the corresponding selection according to actual needs.

[0070] In an exemplary embodiment, the non-isolated circuit further includes N first capacitors, and the second end of each of the first switches is connected to the load through one of the first capacitors; and a second capacitor, and the second end of the second switch is connected to the load through the second capacitor. In this embodiment, the non-isolated circuit may also include N first capacitors, and each output end of the non-isolated circuit is connected to a first capacitor. By connecting the load through the first capacitor, a stable voltage can be output for the load, thereby improving the stability of the power supply. The second end of the second switch can also be connected to the load through the second capacitor, so as to use the stable voltage output through the second capacitor to power the load.

[0071] In an exemplary embodiment, the N first switches are configured to be connected to a controller and turned on or off according to a control signal sent by the controller. In this embodiment, the first switch can be connected to the controller, and the controller can control the turning on and off of the first switch through the control signal.

[0072] In the above embodiment, the first switch, the second switch, the third switch, the fourth switch and the fifth switch can all be controlled by a controller. The controller can control the above switches to be turned on and off at the same time, or to turn on some of the above switches and turn off some of the switches.

[0073] In an exemplary embodiment, the first switch includes at least one of the following: a diode, a bidirectional switch tube, and a switch tube. In this embodiment, the first switch can be a diode, a switch tube, or a bidirectional switch tube.

[0074] In the above embodiment, the second switch, the third switch, the fourth switch and the fifth switch may also be diodes, switch tubes or bidirectional switch tubes.

[0075] When all switches are turned on and off at the same time and the output voltage is turned on by the second potential at the same time, all switches may be diodes.

[0076] In the above embodiments, the single-input multiple-output solution can simplify the control process and increase the duty cycle of each output, thereby improving the overall efficiency of the converter. Compared with the multi-winding transformer solution, the primary winding is omitted, the cost and volume of the magnetic components are reduced, and the corresponding winding loss is reduced.

[0077] In this embodiment, a converter is also provided, including any one of the non-isolated circuits included in the above embodiments. In this embodiment, the non-isolated circuit can be applied to a converter with multiple outputs, and can realize voltage regulation of multiple outputs. It is particularly suitable for occasions requiring high efficiency and high power density.

[0078] In this embodiment, an electronic device is also provided, including the converter included in the above embodiment. In this embodiment, the electronic device can be a wireless communication device, and the converter can be used to power a radio frequency power amplifier in a wireless communication device.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A non-isolated circuit, characterized in that: include: A multi-winding inductor, wherein two ends of the multi-winding inductor are configured to have different potentials, the multi-winding inductor comprises N taps, and each of the taps has a different number of coil turns between the first end of the multi-winding inductor; N first switches, a first end of each of the first switches is connected to a tap, different first switches are connected to different taps, and a second end of each of the first switches is used to connect to a load, wherein N is an integer greater than or equal to 1.

2. The non-isolated circuit according to claim 1, characterized in that: The non-isolated circuit further comprises: an input power source connected to the first end of the multi-winding inductor in a targeted manner; A second switch, wherein the second end of the multi-winding inductor is connected to the load via the second switch, and the second switch is further configured to be connected to a controller and to be turned on or off according to a control signal sent by the controller.

3. The non-isolated circuit according to claim 2, characterized in that: The non-isolated circuit further comprises: A third switch, the second end of the multi-winding inductor is also grounded through the third switch, and the third switch is also configured to be connected to a controller and to be turned on or off according to a control signal sent by the controller.

4. The non-isolated circuit according to claim 3, characterized in that: The non-isolated circuit receives a first control signal sent by the controller to the third switch; When the first control signal is at a high level, the third switch is turned on, and the first switch and the second switch are turned off; When the first control signal is at a low level, the third switch is turned off, and the controller controls at least one of the first switch and the second switch to be turned on, or controls the switches included in the first switch and the second switch to be turned on in different time periods.

5. The non-isolated circuit according to claim 2, characterized in that: The non-isolated circuit further comprises: a fourth switch, wherein the input power source is connected to the first end of the multi-winding inductor through the fourth switch, and the fourth switch is further configured to be connected to a controller and to be turned on or off according to a control signal sent by the controller; A diode, wherein a cathode of the diode is connected to a first end of the multi-winding inductor, and an anode of the diode is grounded.

6. The non-isolated circuit according to claim 5, characterized in that: The non-isolated circuit receives a second control signal sent by the controller to the fourth switch; When the second control signal is at a high level, the fourth switch is turned on, and the controller controls at least one of the first switch and the second switch to be turned on or off, or the controller controls the switches included in the first switch and the second switch to be turned on in different time periods; When the second control signal is at a low level, the fourth switch is turned off, and the controller controls at least one of the first switch and the second switch to be turned on or off, or the controller controls the switches included in the first switch and the second switch to be turned on in different time periods.

7. The non-isolated circuit according to claim 3, characterized in that: The non-isolated circuit further comprises: a fourth switch, wherein the input power source is connected to the first end of the multi-winding inductor through the fourth switch, and the fourth switch is further configured to be connected to a controller and to be turned on or off according to a control signal sent by the controller; A diode, wherein a cathode of the diode is connected to a first end of the multi-winding inductor, and an anode of the diode is grounded.

8. The non-isolated circuit according to claim 7, characterized in that: The non-isolated circuit receives a third control signal sent by the controller to the fourth switch; When the third control signal is at a high level, the fourth switch is turned on, and when the third control signal is at a low level, the fourth switch is turned off; The non-isolated circuit receives a fourth control signal sent by the controller to the third switch; When the fourth control signal is at a high level, the third switch is turned on, and the controller controls the first switch and the second switch to be turned off; When the fourth control signal is at a low level, the third switch is turned off, and the controller controls at least one of the first switch and the second switch to be turned on, or the controller controls the switches included in the first switch and the second switch to be turned on in different time periods.

9. The non-isolated circuit according to claim 2, characterized in that: The non-isolated circuit also includes a fifth switch, the second end of the multi-winding inductor is connected to the input power supply through the fifth switch, the first end of the multi-winding inductor is grounded, and the fifth switch is also configured to be connected to a controller and turned on or off according to a control signal sent by the controller.

10. The non-isolated circuit according to claim 9, characterized in that: The non-isolated circuit receives a fifth control signal sent by the controller to the fifth switch; When the fifth control signal is at a high level, the fifth switch is turned on, and the controller controls the first switch and the second switch to be turned off; When the fifth control signal is at a low level, the fifth switch is turned off, and the controller controls at least one of the first switch and the second switch to be turned on, or the controller controls the switches included in the first switch and the second switch to be turned on in different time periods.

11. The non-isolated circuit according to claim 2, characterized in that: The non-isolated circuit further comprises: N first capacitors, the second end of each of the first switches being connected to a load via one of the first capacitors; A second capacitor, wherein the second end of the second switch is connected to the load through the second capacitor.

12. The non-isolated circuit according to claim 1, characterized in that: The N first switches are configured to be connected to a controller and to be turned on or off according to a control signal sent by the controller.

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