AC / DC output control circuit and power supply equipment

Abstract

The utility model relates to an AC / DC output control circuit and power supply equipment. The circuit comprises a rectifying circuit, a bus capacitor, an inverter circuit and a switch control circuit, the input end of the rectifying circuit is electrically connected with a power supply, the output end of the rectifying circuit is connected with the bus capacitor in parallel, and the input end of the inverter circuit is connected with the bus capacitor in parallel; the direct current input end of the switch control circuit is electrically connected with the direct current output end of the inverter circuit or the alternating current output end of the inverter circuit, and the direct current output end of the switch control circuit is used for being electrically connected with a direct current load; the AC input end of the switch control circuit is electrically connected with the AC output end of the inverter circuit, and the AC output end of the switch control circuit is used for being electrically connected with an AC load. Compared with the independent output mode of alternating current and direct current, the alternating current or direct current can be output under the control and conversion of the same circuit and share the same inverter circuit, the used circuit materials are less, and the circuit complexity is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply, in particular to an AC / DC output control circuit and a power supply device. BACKGROUND

[0002] In the field of power supply and conversion technology today, with the rapid development of technology and the continuous change of market demand, the design and implementation of power supply systems are facing unprecedented challenges and opportunities. Among them, the independent output scheme of direct current (DC) output and alternating current (AC) output has become the mainstream trend in the current market. This trend not only reflects the achievements of technological progress, but also deeply affects the cost structure, efficiency and application range expansion of power equipment.

[0003] However, it cannot be ignored that the way of independent output of direct current and alternating current not only has many circuit materials, but also has high cost. CONTENT OF THE UTILITY MODEL

[0004] The present application provides an AC / DC output control circuit and a power supply device, which can solve the technical problems of complex circuit structure and high cost caused by the AC and DC independent output mode of the prior art due to many circuit materials.

[0005] According to one aspect of the embodiments of the present application, the present application provides an AC / DC output control circuit applied to the output control of a direct current load or an alternating current load in a power supply device, comprising a rectifier circuit, a bus capacitor, an inverter circuit and a switch control circuit; the input end of the rectifier circuit is used for electrically connecting a power supply, the output end of the rectifier circuit is connected in parallel with the bus capacitor, and the input end of the inverter circuit is connected in parallel with the bus capacitor; the direct current input end of the switch control circuit is electrically connected with the direct current output end of the inverter circuit or the alternating current output end of the inverter circuit, and the direct current output end of the switch control circuit is used for electrically connecting a direct current load; the alternating current input end of the switch control circuit is electrically connected with the alternating current output end of the inverter circuit, and the alternating current output end of the switch control circuit is used for electrically connecting an alternating current load.

[0006] Optionally, the inverter circuit comprises a first bridge arm unit, a second bridge arm unit and an inductor, the first bridge arm unit and the second bridge arm unit each comprise two series-connected switch tubes, one end of the inductor is electrically connected with the series connection point of the two switch tubes in the first bridge arm unit, the other end of the inductor is electrically connected with the series connection point of the two switch tubes in the second bridge arm unit and serves as the alternating current output end of the inverter circuit, and the parallel connection point of the first bridge arm unit and the second bridge arm unit serves as the direct current output end of the inverter circuit.

[0007] Optionally, when the direct current input end of the switch control circuit is connected with the direct current output end of the inverter circuit, the inverter circuit further comprises a first switch, one end of the first switch is electrically connected with one end of the inductor and the alternating current input end of the switch control circuit, and the other end of the first switch is electrically connected with the alternating current output end on the second bridge arm unit.

[0008] Optionally, the first bridge arm unit comprises a first switch tube and a second switch tube connected in series, the second bridge arm unit comprises a third switch tube and a fourth switch tube connected in series, the first switch tube and the third switch tube are electrically connected, the other end of the second switch tube and the fourth switch tube is used for grounding, and the inverter circuit further comprises a second switch, the second switch is arranged on a line where the first switch tube and the second switch tube are connected.

[0009] Optionally, a third switch is arranged between the direct current input end of the switch control circuit and the direct current output end of the switch control circuit, and a fourth switch is arranged between the alternating current input end of the switch control circuit and the alternating current output end of the switch control circuit.

[0010] Optionally, the alternating current output end of the inverter circuit is connected in parallel with a first capacitor.

[0011] Optionally, when the power supply is a three-phase power supply, the rectifier circuit comprises a three-phase bridge half-controlled rectifier circuit.

[0012] Optionally, the three-phase bridge half-controlled rectifier circuit comprises a first group of rectifier units, a second group of rectifier units and a third group of rectifier units connected in parallel, each group of rectifier units comprises a bidirectional thyristor and a diode connected in series, and the anode of the diode is connected with the bidirectional thyristor.

[0013] The middle point of each group of the bidirectional thyristor and the diode connected in series is used as the input end of the rectifier circuit and is connected with the power supply, the parallel connection end of the first group of rectifier units, the second group of rectifier units and the third group of rectifier units is used as the rectification output end of the rectifier circuit, each phase of the power supply is correspondingly electrically connected with the input end in the first group of rectifier units, the second group of rectifier units and the third group of rectifier units, and the rectification output end of the rectifier circuit is electrically connected with the bus capacitor and the input end of the inverter circuit.

[0014] Optionally, a controller is further included, and the controller is electrically connected with the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the first switch, the second switch, the third switch and the fourth switch respectively.

[0015] According to another aspect of the embodiments of this application, this application provides a power supply device, the power supply device comprising: a power supply; and an AC / DC output control circuit as described above, wherein the power supply is electrically connected to the input terminal of the rectifier circuit in the AC / DC output control circuit.

[0016] Compared with related technologies, the technical solutions provided in this application have the following advantages:

[0017] This application provides an AC / DC output control circuit. The AC power supplied by the power supply is rectified by a rectifier circuit to output DC power to an inverter circuit. The inverter circuit performs inversion or voltage reduction. When a DC load is connected to the circuit, the DC path of the circuit is turned on by a control switch, connecting the inverter circuit to the DC load and providing DC power. When an AC load is connected to the circuit, the AC path of the circuit is turned on by a control switch, connecting the inverter circuit to the AC load and providing AC power. This circuit not only enables AC or DC output under the control and conversion of the same circuit, but also allows both AC and DC outputs to share the same inverter circuit. Compared to independent AC and DC output methods, this circuit requires fewer components, reducing circuit complexity and lowering the material cost of the power supply. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of an optional AC / DC output control circuit module provided according to an embodiment of this application;

[0021] Figure 2 This is a circuit diagram of an optional AC / DC output control circuit according to an embodiment of this application;

[0022] Figure 3 This is a circuit diagram of another optional AC / DC output control circuit provided according to an embodiment of this application;

[0023] Figure 4 This is a circuit diagram of another optional AC / DC output control circuit provided according to an embodiment of this application;

[0024] Figure 5 Another optional AC / DC output control circuit module schematic diagram is provided according to the embodiment of the application.

[0025] The reference signs are explained as follows: 1, rectifier circuit, 11, first group of rectifier units, 12, second group of rectifier units, 13, third group of rectifier units, 2, inverter circuit, 3, switch control circuit. DETAILED DESCRIPTION

[0026] To make the objectives, technical solutions and advantages of the embodiments of the application clearer, the technical solutions in the embodiments of the application will be described below in connection with the drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the application.

[0027] The technical problem of the prior art is that the AC and DC independent output mode causes the circuit structure to be complex and the cost to be high due to many circuit materials.

[0028] In combination with Figure 1 As shown in the drawings, to solve the aforementioned problems, according to an aspect of the embodiment of the application, an AC / DC output control circuit is provided. The AC / DC output control circuit is applied to output control of a DC load or an AC load in a power supply device, and includes a rectifier circuit 1, a bus capacitor, an inverter circuit 2 and a switch control circuit 3.

[0029] The input end of the rectifier circuit 1 is electrically connected to a power supply, the output end of the rectifier circuit 1 is connected in parallel to the bus capacitor, and the input end of the inverter circuit 2 is connected in parallel to the bus capacitor.

[0030] The DC input end of the switch control circuit 3 is electrically connected to the DC output end of the inverter circuit 2 or the AC output end of the inverter circuit 2, and the DC output end of the switch control circuit 3 is electrically connected to a DC load. The AC input end of the switch control circuit 3 is electrically connected to the AC output end of the inverter circuit 2, and the AC output end of the switch control circuit 3 is electrically connected to an AC load.

[0031] The AC load and the DC load are arranged in the power supply device. The AC load can be an AC power supply, which is used to provide an AC power supply for an external device plugged into the AC load in the power supply device. The DC load can be a DC power supply, which is used to provide a DC power supply for an external device plugged into the DC load in the power supply device. The AC / DC output control circuit provided by the embodiment can realize the function of outputting an AC power supply for an AC load or providing a DC power supply for a DC load.

[0032] The bus capacitor C1 is connected in parallel with the rectifier circuit 1 and the inverter circuit 2, and can stabilize and filter the voltage rectified by the rectifier circuit 1 and store energy, thereby improving the anti-interference capability and ensuring that the inverter circuit 2 receives a more stable input voltage.

[0033] The power supply can be a three-phase or two-phase alternating current power supply, and the rectifier circuit 1 can be a fully controlled rectifier circuit or a semi-controlled rectifier circuit. In this embodiment, the power supply is a three-phase alternating current power supply, and the rectifier circuit 1 is a semi-controlled rectifier circuit. The rectifier circuit 1 can perform semi-controlled rectification on the three-phase alternating current output by the thyristor device through the three-phase alternating current power supply, and then output a direct current BUS voltage. The semi-controlled rectification can refer to rectifying the input alternating current by combining a controllable rectifier element and an uncontrollable rectifier element, for example, combining a thyristor and a diode.

[0034] The inverter circuit 2 can be an H-bridge inverter circuit, a push-pull inverter circuit, a half-bridge inverter circuit, a full-bridge inverter circuit, etc. In this embodiment, an H-bridge inverter circuit is described. When an external device is plugged into the direct current load, the switch control circuit 3 electrically connected to the direct current load can be controlled to be turned on, so that the inverter circuit 2 is connected to the direct current load to form a control loop. The inverter circuit 2 performs step-up and step-down processing on the direct current BUS voltage output by the rectifier circuit 1 and then outputs it to the direct current load, thereby providing a direct current power supply for the external device plugged into the direct current load. When an external device is plugged into the alternating current load, the switch control circuit 3 electrically connected to the alternating current load can be controlled to be turned on, so that the inverter circuit 2 is connected to the alternating current load to form a control loop. The inverter circuit 2 performs inverter processing on the direct current BUS voltage output by the rectifier circuit 1 and then outputs it to the alternating current load, thereby providing an alternating current power supply for the external device plugged into the alternating current load. Finally, by sharing one inverter circuit 2, the direct current power supply or the alternating current power supply can be output at different times in the same circuit.

[0035] The switch control circuit 3 can only include a plurality of switches, or can include switches, inductors, capacitors and the like, or a combination circuit composed of switches, inductors and capacitors. The direct current input end of the switch control circuit 3 is electrically connected with the direct current output end of the inverter circuit 2 or the alternating current output end of the inverter circuit 2, and the direct current output end of the switch control circuit 3 is used for electrically connecting a direct current load. In this case, when the switch control circuit 3 is turned on, a direct current output control loop can be formed through different connection modes of the direct current input end of the switch control circuit 3, and a direct current power supply is provided for the direct current load. Similarly, by electrically connecting the alternating current input end of the switch control circuit 3 with the alternating current output end of the inverter circuit 2, the alternating current output end of the switch control circuit 3 is used for electrically connecting an alternating current load. In this case, when the switch control circuit 3 is turned on, an alternating current output control loop can be formed, and an alternating current power supply is provided for the alternating current load. In this way, by controlling the switch control circuit 3, the same inverter circuit 2 can be used to realize alternating current power supply or direct current power supply for the load.

[0036] In the embodiment of the utility model, the alternating current provided by the power supply is rectified by the rectifier circuit 1 and then the direct current is output to the inverter circuit 2, and the inverter or voltage reduction is realized through the inverter circuit 2. When the direct current load is connected in the circuit, the direct current path of the switch control circuit 3 is turned on by control, the inverter circuit 2 is connected with the direct current load, and the direct current power supply can be provided for the direct current load. When the alternating current load is connected in the circuit, the alternating current path of the switch control circuit 3 is turned on by control, the inverter circuit 2 is connected with the alternating current load, and the alternating current power supply can be provided for the alternating current load. Not only the alternating current or direct current output can be realized under the control and conversion of the same circuit, but also the alternating current output and the direct current output share the same inverter circuit 2. Compared with the circuit material used in the independent output mode of alternating current and direct current, the circuit complexity is reduced, and the material cost of the power supply circuit is reduced.

[0037] In some optional embodiments, in combination with Figures 2 to 4 As shown, the inverter circuit 2 includes a first bridge arm unit, a second bridge arm unit and an inductor. The first bridge arm unit and the second bridge arm unit each include two series-connected switch tubes. One end of the inductor is electrically connected with the series connection point of the two switch tubes in the first bridge arm unit, and the other end of the inductor is electrically connected with the series connection point of the two switch tubes in the second bridge arm unit and serves as the alternating current output end of the inverter circuit 2. The parallel connection point of the first bridge arm unit and the second bridge arm unit serves as the direct current output end of the inverter circuit 2.

[0038] In the embodiment, when the inverter circuit 2 is an H-bridge inverter circuit, the inverter circuit 2 comprises a first bridge arm unit, a second bridge arm unit and an inductor L. The inductor L1 can be used to store / release energy when the inverter circuit 2 is in step-down mode, and one end of the inductor L is electrically connected to the series connection point of the two switch tubes in the first bridge arm unit, and the other end of the inductor L is electrically connected to the series connection point of the two switch tubes in the second bridge arm unit and serves as the AC output end of the inverter circuit 2. When the AC input end of the switch control circuit 3 is electrically connected to the AC output end of the inverter circuit 2, the AC power outputted through the first bridge arm unit and the second bridge arm unit can be outputted to the AC load based on the AC output end of the inverter circuit 2 and the switch control circuit 3; when the DC input end of the switch control circuit 3 is electrically connected to the AC output end of the inverter circuit 2, the DC power outputted through the first bridge arm unit and the second bridge arm unit in step-up / step-down mode can be outputted to the AC load based on the AC output end of the inverter circuit 2. By taking the parallel connection point of the first bridge arm unit and the second bridge arm unit as the DC output end of the inverter circuit 2, when the DC input end of the switch control circuit 3 is electrically connected to the DC output end of the inverter circuit 2, the DC power processed through the first bridge arm unit and the second bridge arm unit in step-up / step-down mode can be outputted to the DC load based on the two DC output ends of the inverter circuit 2 and the switch control circuit 3.

[0039] In the embodiment, in the inverter circuit 2, based on the inductor L, the storage / release of energy can be realized when the inverter circuit 2 is in step-down mode, and by controlling the conduction state of each switch tube in the first bridge arm unit and the second bridge arm unit, the DC power can be converted into AC power or the step-up / step-down processing of the DC power can be realized, and then the AC output or the DC output of the inverter circuit 2 can be realized, thereby providing the corresponding type of power supply for the subsequent AC load or DC load.

[0040] In some alternative embodiments, in combination with Figure 3 As shown in the figure, when the DC input end of the switch control circuit 3 is connected to the DC output end of the inverter circuit 2, the inverter circuit 2 further comprises a first switch S1.

[0041] One end of the first switch S1 is electrically connected to one end of the inductor L1 and the AC input end of the switch control circuit 3, and the other end of the first switch S1 is electrically connected to the AC output end on the second bridge arm unit.

[0042] In the embodiment, the first switch S1 described above can be used to control the inverter circuit 2 to output DC power to the DC load. When the first switch S1 is turned on, the first switch tube Q1, the inductor L1, the fourth switch tube Q4, the third switch tube Q3 and the part of the switch control circuit 3 connected to the DC load can form a buck-boost step-up / step-down circuit to supply DC power to the DC load.

[0043] In some alternative embodiments, in combination withFigure 4 As shown, the first bridge arm unit includes a first switch tube and a second switch tube connected in series, the second bridge arm unit includes a third switch tube and a fourth switch tube connected in series, the first switch tube and the third switch tube are electrically connected, and the other end of the second switch tube and the fourth switch tube is used for grounding. The inverter circuit further includes a second switch, which is arranged on a line connected with the first switch tube and the second switch tube.

[0044] The first bridge arm unit includes a first switch tube Q1 and a second switch tube Q2 connected in series, and the second bridge arm unit includes a third switch tube Q3 and a fourth switch tube Q4 connected in series. The first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 can be silicon-based transistors, MOSFET tubes, IGBT tubes, etc. The midpoint of the first switch tube Q1 and the second switch tube Q2 is used as one of the AC output ends of the inverter circuit 2, and the midpoint of the third switch tube Q3 and the fourth switch tube Q4 is used as the other AC output end of the inverter circuit 2. The two ends of the first bridge arm unit and the second bridge arm unit are respectively provided with a parallel connection point, and the two parallel connection points are used as the two DC output ends of the inverter circuit 2.

[0045] Further, the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 and the inductor L1 can constitute an H4 bridge circuit. The DC BUS voltage output by the rectifier circuit 1 can pass through the H4 bridge circuit to output AC power to the load, or the DC BUS voltage can pass through the H4 bridge circuit to output DC power to the load.

[0046] Further, the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 can be controlled to be turned on and turned off by the control signal input by the controller, so as to control the current direction and the conduction period. When the input end of the inverter circuit 2 inputs DC power, the conduction state of the four switch tubes can be controlled to generate AC power. For example, when the first switch tube Q1 and the fourth switch tube Q4 are turned on at the same time, and the circuit in which the control switch control circuit 3 is electrically connected with the DC load is turned on, the current flows from the positive electrode of the power supply, passes through the first switch tube Q1, the DC load and the fourth switch tube Q4, and then flows back to the negative electrode of the power supply, forming a DC control loop, and at this time, the current direction is positive. When the second switch tube Q2 and the third switch tube Q3 are turned on at the same time, and the circuit in which the control switch control circuit 3 is electrically connected with the AC load is turned on, the current flows from the negative electrode of the power supply, passes through the second switch tube Q2, the AC load and the third switch tube Q3, and then flows back to the positive electrode of the power supply, forming an AC control loop, and at this time, the current direction is negative. In this way, the conduction state of the four switch tubes can be regularly switched to simulate the fluctuation effect of AC power or DC power.

[0047] In the embodiment, as shown in Figure 4 The inverter circuit 2 further comprises a second switch, which is electrically connected to a DC output terminal of the inverter circuit 2, and is arranged on a line connected between the first switch tube and the second switch tube.

[0048] Specifically, when the DC input terminal of the switch control circuit 3 is connected to the DC output terminal of the inverter circuit 2, the inverter circuit 2 further comprises a second switch S2. By controlling the on or off state of the second switch S2, the inverter circuit 2 can output DC voltage to a DC load or output AC voltage to an AC load.

[0049] Further, when AC output is needed, the second switch S2 is controlled to be closed, S1 remains open, and the switches in the switch control circuit 3 connected to the AC load are turned on, and the inverter output is realized through the H4 bridge circuit; when DC output is needed, the second switch S2 is controlled to remain open, the first switch S1 is closed, and the switches in the switch control circuit 3 connected to the AC load are turned off. At this time, Q1, L1, Q4, Q3, S2 and the switches in the switch control circuit 3 connected to the DC load form a buck-boost circuit. When Q1 and Q4 are turned on, S1 is closed, and the switches in the switch control circuit 3 connected to the DC load are turned off, the inductor L1 stores energy. When Q1 and Q2 are turned on, S1 is closed, and the switches in the switch control circuit 3 connected to the DC load are turned on, L1 releases energy, and finally provides a DC voltage meeting the requirements of the DC load, realizing power supply for the load plugged into the DC load.

[0050] As a possible embodiment, as shown in Figure 2 When the DC input terminal of the switch control circuit 3 is electrically connected to the AC output terminal of the inverter circuit 2, the inverter circuit 2 can not comprise the first switch S1 and the second switch S2. In this case, the output of the DC voltage or the AC power supply can be controlled by directly controlling the on or off of the DC path or the AC path in the switch control circuit 3.

[0051] In the embodiment, the first switch tube Q1, the second switch tube Q2, the third switch tube Q3, the fourth switch tube Q4 and the inductor L can realize inverter or boost-buck processing, output DC or AC to the DC load or the AC load. Secondly, according to the different structures of the inverter circuit 2, various connection modes between the inverter circuit 2 and the switch control circuit 3 and the realization modes of the DC or AC output are provided, which have wider selectivity, and all can realize the output of AC or DC by controlling the on or off of the switch control circuit 3 or jointly controlling the first switch S1, the second switch S2 and the switch control circuit 3 under the condition of sharing one H4 bridge circuit, which uses less circuit materials and has low circuit complexity, and is conducive to reducing the cost of materials.

[0052] In some alternative embodiments, in combination with Figures 2 to 4 As shown, a third switch is provided between the DC input end of the switch control circuit 3 and the DC output end of the switch control circuit 3, and a fourth switch is provided between the AC input end of the switch control circuit 3 and the AC output end of the switch control circuit 3.

[0053] Specifically, when the DC input end of the switch control circuit 3 is electrically connected with the DC output end of the inverter circuit 2 or the AC output end of the inverter circuit 2, a third switch can be provided between the DC input end of the switch control circuit 3 and the DC output end of the switch control circuit 3. The switch control circuit 3 is connected with the inverter circuit 2 and the DC load through a double-line circuit, and the third switch can include a switch provided on one of the two lines, or can include two switches provided on the two lines, i.e., there can be only one switch or two switches. If there are two switches, the DC power output by the inverter circuit 2 can be output to the DC load through the switch control circuit 3 only when both of the two switches are turned on. In this embodiment, the third switch includes one switch S3, which is taken as an example. When the switch S3 is turned on, the DC voltage generated by the inverter circuit 2 performing step-up and step-down conversion can be output to the DC load to provide DC power supply for the DC load.

[0054] Specifically, the fourth switch provided between the AC input end of the switch control circuit 3 and the AC output end of the switch control circuit 3 can include only one switch or two switches. Specifically, one switch is provided on one branch between the AC input end of the switch control circuit 3 and the AC output end of the switch control circuit 3, or one switch is respectively provided on the two branches between the AC input end of the switch control circuit 3 and the AC output end of the switch control circuit 3. In this embodiment, one switch is respectively provided on the two branches between the AC input end of the switch control circuit 3 and the AC output end of the switch control circuit 3, including the switch S4 and the switch S5. When AC output is needed, the switches S2, S4 and S5 are closed, and the H4 bridge circuit is used for inverter output; when DC output is needed, the switches S2, S4 and S5 are kept open, and the other switches are turned on, and the devices Q1, L1, Q4, Q3, S1 and S3 form a buck-boost step-up and step-down circuit to output DC voltage for the DC load.

[0055] In the embodiment, a third switch is arranged between the DC input end of the switch control circuit 3 and the DC output end of the switch control circuit 3, and a fourth switch is arranged between the AC input end of the switch control circuit 3 and the AC output end of the switch control circuit 3. By controlling the third switch to be turned on and the fourth switch to be turned off, the DC output of the inverter circuit 2 can be realized to supply power to the DC load. By controlling the third switch to be turned off and the fourth switch to be turned on, the AC output of the inverter circuit 2 can be realized to supply power to the AC load.

[0056] In some optional embodiments, in combination with Figures 2 to 4 As shown, the AC output end of the inverter circuit 2 is connected in parallel with the first capacitor.

[0057] The first capacitor C2 is used as a filter capacitor to stabilize and filter the output voltage of the inverter circuit 2, which is more conducive to providing a more stable DC voltage for the DC load or a more stable AC voltage for the AC load.

[0058] In some optional embodiments, when the power supply is a three-phase power supply, the rectifier circuit 1 includes a three-phase bridge half-controlled rectifier circuit.

[0059] Specifically, in the half-controlled rectification of three-phase AC power, a three-phase half-wave controllable rectifier circuit and a three-phase bridge half-controlled rectifier circuit are usually included. The three-phase half-wave controllable rectifier circuit can refer to using three thyristors (thyristors), each of which is electrically connected to one phase of the three-phase power supply. Each thyristor is turned on when its phase is in the positive half cycle to provide a corresponding DC output. When the voltage of a phase of the three-phase power supply is positive, the corresponding thyristor is turned on to convert the AC power of the phase into a DC output. As the phase of the power supply changes, different thyristors are sequentially turned on to obtain pulsed DC power on the load. By adjusting the trigger angle of the thyristor, the average value of the output voltage can be controlled.

[0060] In the embodiment, when the power supply is a three-phase power supply, the provided rectifier circuit can be a three-phase bridge half-controlled rectifier circuit. The three-phase bridge half-controlled rectifier circuit can be composed of three thyristors and three diodes to form a bridge rectifier structure. The thyristors are used as controllable switching elements to adjust the rectification process by controlling the thyristor conduction and cutoff, while the diodes are used as non-controllable elements to perform rectification and reverse protection. In the three-phase bridge half-controlled rectifier circuit, two thyristors are turned on at any time to form a current path. When the three-phase AC load is connected, the thyristors and diodes are turned on and off in a certain order to convert the AC power into pulsed DC power output. Similarly, by adjusting the trigger angle of the thyristor, the size of the output voltage can be controlled.

[0061] In the embodiment, when the power supply is a three-phase power supply, the rectification is realized by the three-phase bridge half-controlled rectification circuit, the number of components is reduced compared with a three-phase fully-controlled rectification circuit, and the circuit structure is simpler; and the number of thyristors in the three-phase bridge half-controlled rectification circuit is smaller, so it is relatively easy to adjust the trigger angle and control the circuit, and the circuit can be more flexibly adapted to different loads and input voltage changes in actual application, while providing a stable DC output voltage.

[0062] In some optional embodiments, in combination with Figures 2 to 5 As shown, the three-phase bridge half-controlled rectification circuit includes a first group of rectification units 11, a second group of rectification units 12 and a third group of rectification units 13 connected in parallel, each group of rectification units includes a bidirectional thyristor and a diode connected in series, and the anode of the diode is connected with the bidirectional thyristor;

[0063] The midpoint of each group of series-connected bidirectional thyristors and diodes serves as the input end of the rectification circuit 1 and is connected with the power supply, the parallel connection end of the first group of rectification units 11, the second group of rectification units 12 and the third group of rectification units 13 serves as the rectification output end of the rectification circuit 1, each phase of the power supply is respectively connected with the input end in the first group of rectification units 11, the second group of rectification units 12 and the third group of rectification units 13, and the rectification output end of the rectification circuit 1 is connected with the bus capacitor and the input end of the inverter circuit 2.

[0064] In the embodiment, the power supply can be respectively connected with each rectification unit by connecting three groups of rectification units in parallel, so that the rectification of each phase output can be realized, for example, the A phase is connected to the first group of rectification units 11, the B phase is connected to the second group of rectification units 12, and the C phase is connected to the third group of rectification units 13, so that the rectification of the A, B and C three-phase is realized.

[0065] Each rectifying unit can be composed of one thyristor and one diode. Three groups of rectifying units are composed of three thyristors and three diodes. In each group of rectifying units, the thyristor and the diode are connected in series, and the midpoint of the thyristor and the diode connected in series can be used as the input end of the rectifying circuit to be connected to each phase of the three-phase power supply. The parallel connection end of each group of rectifying units is used as the rectifying output end of the rectifying circuit 1 to output the BUS direct current voltage to the inverter circuit 2. For example, the first group of rectifying units 11 includes a thyristor T1 and a diode D1, the second group of rectifying units 12 includes a thyristor T2 and a diode D2, and the third group of rectifying units 13 includes a thyristor T3 and a diode D3. The A phase of the three-phase power supply is connected to the midpoint of the thyristor T1 and the diode D1, the B phase is connected to the midpoint of the thyristor T2 and the diode D2, and the C phase is connected to the midpoint of the thyristor T3 and the diode D3. In this way, not only can the direct current output be achieved, but also the rectification and reverse protection functions can be achieved through the diode, and the materials used are also less. The thyristor can be a bidirectional thyristor. The bidirectional thyristor is turned on by applying a trigger pulse to its control electrode, thereby controlling the direction and size of the current.

[0066] In the embodiment, when the power supply is a three-phase power supply, the input ends of the three groups of rectifying units are respectively electrically connected to the three phases of the power supply. The three-phase alternating current can be rectified by the rectifying units to convert the three-phase alternating current into direct current to meet the power supply requirements of subsequent direct current loads or alternating current loads. By connecting the bidirectional thyristor and the diode in series in each group of rectifying units, not only can each phase of the power supply be converted into direct current, but also the diode can be used to achieve reverse protection, thereby providing basic output for subsequent power consumption.

[0067] In some optional embodiments, the AC / DC output control circuit further includes a controller electrically connected to the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the first switch, the second switch, the third switch, and the fourth switch.

[0068] In the embodiment, the controller can control each switching device in the circuit as a control center, and can be electrically connected with the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, the fourth switching tube Q4, and the first switch S1, the second switch S2, the third switch, and the fourth switch in the inverter circuit 2 to realize the on or off control of the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, the fourth switching tube Q4, and the first switch S1, the second switch S2, the third switch, and the fourth switch. For the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, and the fourth switching tube Q4, different sizes of voltage can be input to make the switching tube on or off; for the first switch S1, the second switch S2, the third switch, and the fourth switch, control instructions can be input to control the switch to open or close.

[0069] According to another aspect of the embodiments of the present application, the embodiments of the present application further provide a power supply device, which comprises a power supply;

[0070] and the AC / DC output control circuit in any of the above embodiments, and the input end of the rectifier circuit 1 in the AC / DC output control circuit is electrically connected with the power supply.

[0071] In the embodiment, the provided power supply device can be used in various scenes or fields, including but not limited to portable electronic devices such as mobile phones, notebook computers, tablet computers, etc., many household appliances such as televisions, audio equipment, etc., and electric vehicles, renewable energy systems, generators, and energy storage systems, etc.

[0072] The power supply device comprises the AC / DC output control circuit in each embodiment and the power supply, and the input end of the rectifier circuit 1 in the AC / DC output circuit is electrically connected with the power supply to provide the input AC input voltage to the AC / DC output control circuit, and the input AC input voltage is rectified and inverter / boosting processed by the AC / DC output control circuit, and under the corresponding control of the controller on the switches in the inverter circuit 2 and the switching control circuit 3, the DC load output DC voltage or the AC load output AC voltage is realized. It should be noted that the power supply device comprises the AC / DC output control circuit in each of the above embodiments, and thus each embodiment in the AC / DC output control circuit can be realized and the corresponding technical effects can be achieved, which will not be repeated here.

[0073] It should be noted that, in the present document, relational terms such as first and second, and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process or method that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process or method. Items under "including" or "having" are not meant to be open-ended including any and all subsequent similar terms or items.

[0074] It should be understood that the same or similar reference signs in the drawings of the embodiments represent the same or similar parts; in the description of the present application, if the orientation or position relationship indicated by the terms "upper", "lower", "left", "right" and the like is based on the orientation or position relationship shown in the drawings, it is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the position relationship in the drawings are only used for exemplary illustration, and cannot be understood as a limitation on the present application, for those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances. The components in the circuit in the embodiments can be electrically connected.

[0075] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described or recorded in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0076] The above is only a specific embodiment of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. An AC / DC output control circuit, characterized in that, It is used for output control of DC or AC loads in power supply equipment, including rectifier circuits, bus capacitors, inverter circuits and switch control circuits; The input terminal of the rectifier circuit is used to electrically connect to the power supply, the output terminal of the rectifier circuit is connected in parallel with the bus capacitor, and the input terminal of the inverter circuit is connected in parallel with the bus capacitor. The DC input terminal of the switch control circuit is electrically connected to either the DC output terminal or the AC output terminal of the inverter circuit. The DC output terminal of the switch control circuit is used to electrically connect to a DC load. The AC input terminal of the switch control circuit is electrically connected to the AC output terminal of the inverter circuit. The AC output terminal of the switch control circuit is used to electrically connect to an AC load.

2. The AC / DC output control circuit according to claim 1, characterized by The inverter circuit includes a first bridge arm unit, a second bridge arm unit, and an inductor. Both the first bridge arm unit and the second bridge arm unit include two switching transistors connected in series. One end of the inductor is electrically connected to the series connection point of the two switching transistors in the first bridge arm unit, and the other end of the inductor is electrically connected to the series connection point of the two switching transistors in the second bridge arm unit and serves as the AC output terminal of the inverter circuit. The parallel connection point of the first bridge arm unit and the second bridge arm unit serves as the DC output terminal of the inverter circuit.

3. The AC / DC output control circuit according to claim 2, characterized by When the DC input terminal of the switch control circuit is connected to the DC output terminal of the inverter circuit, the inverter circuit further includes a first switch; One end of the first switch is electrically connected to one end of the inductor and the AC input terminal of the switch control circuit, and the other end of the first switch is electrically connected to the AC output terminal on the second bridge arm unit.

4. The AC / DC output control circuit according to claim 3, characterized by The first bridge arm unit includes a first switch and a second switch connected in series. The second bridge arm unit includes a third switch and a fourth switch connected in series. The first switch and the third switch are electrically connected. The other end of the second switch and the fourth switch is used for grounding. The inverter circuit also includes a second switch, which is disposed on the line connecting the first switch and the second switch.

5. The AC / DC output control circuit according to claim 4, characterized by A third switch is provided between the DC input terminal and the DC output terminal of the switch control circuit, and a fourth switch is provided between the AC input terminal and the AC output terminal of the switch control circuit.

6. The AC / DC output control circuit according to claim 1, characterized by A first capacitor is connected in parallel to the AC output terminal of the inverter circuit.

7. The AC / DC output control circuit according to claim 1, characterized by When the power supply is a three-phase power supply, the rectifier circuit includes a three-phase bridge semi-controlled rectifier circuit.

8. The AC / DC output control circuit according to claim 7, characterized by The three-phase bridge semi-controlled rectifier circuit includes a first group of rectifier units, a second group of rectifier units, and a third group of rectifier units connected in parallel. Each group of rectifier units includes a bidirectional thyristor and a diode connected in series, and the positive terminal of the diode is connected to the bidirectional thyristor. The midpoint of the bidirectional thyristor and the diode connected in series in each group is connected with the power supply as the input terminal of the rectifier circuit, the parallel connection terminal of the first group of rectifier units, the second group of rectifier units and the third group of rectifier units is the rectification output terminal of the rectifier circuit, each phase of the power supply is respectively connected with the input terminal of the first group of rectifier units, the second group of rectifier units and the third group of rectifier units, and the rectification output terminal of the rectifier circuit is connected with the bus capacitor and the input terminal of the inverter circuit.

9. The AC / DC output control circuit according to claim 5, wherein The controller is further connected with the first switch, the second switch, the third switch, the fourth switch, the first switch tube, the second switch tube, the third switch tube and the fourth switch tube.

10. A power supply device, characterized by comprising: The power supply device comprises: a power supply; and the AC / DC output control circuit according to any one of claims 1-9, wherein the power supply is connected with the input terminal of the rectifier circuit in the AC / DC output control circuit.

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