Power supply circuit and alternating current power supply comprising same

Abstract

The utility model discloses a power supply circuit and an AC power supply comprising the same. The circuit comprises an AC / DC power supply input full-bridge rectification circuit, a DC / DC power supply input and output circuit, a DC / AC control full-bridge inversion circuit, a plurality of transformer circuits and a controller. The AC / DC power supply input full-bridge rectifier circuit, the DC / DC power supply input and output circuit and the DC / AC control full-bridge inverter circuit are connected in sequence, and the DC / AC control full-bridge inverter circuit is connected with each transformer circuit; each transformer circuit comprises a control switch and a transformer loop, and the control switch is used for receiving a signal of the controller so as to turn on or turn off the transformer loop. According to the circuit provided by the embodiment of the invention, AC voltage output with a wider range can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of AC power supply, in particular to an AC power supply circuit and an AC power supply comprising the same, and belongs to the field of AC power supply. BACKGROUND

[0002] Adjustable AC power supply can provide stable output, which is crucial for electronic device testing that requires different power supply. They can help engineers accurately detect the performance and reliability of the device and avoid test errors caused by power fluctuations. However, the current AC power supply circuit uses a single transformer for voltage regulation, with limited adjustment range.

[0003] In view of the above problems, no effective solution has been proposed so far. CONTENT OF THE INVENTION

[0004] Therefore, the present application provides an AC power supply circuit and an AC power supply comprising the same, aiming to realize a wider range of AC voltage output.

[0005] According to an aspect of the present application, an AC power supply circuit is provided, comprising an AC / DC power input full-bridge rectifier circuit, a DC / DC power input / output circuit, a DC / AC control full-bridge inverter circuit, a plurality of transformer circuits and a controller; the AC / DC power input full-bridge rectifier circuit, the DC / DC power input / output circuit and the DC / AC control full-bridge inverter circuit are connected in sequence, and the DC / AC control full-bridge inverter circuit is connected with each transformer circuit; each transformer circuit comprises a control switch and a transformer loop, and the control switch is used to receive the signal of the controller to turn on or turn off the transformer loop.

[0006] Further, the DC / AC control full-bridge inverter circuit comprises an input end, a first switch component, a second switch component, a third switch component, a fourth switch component and an output end; the input end is connected with the first switch component and the second switch component respectively, the output end is connected with the third switch component and the fourth switch component respectively, the first switch component and the third switch component are connected, and the second switch component and the fourth switch component are connected; one end of the transformer circuit is connected between the first switch component and the third switch component, and the other end of the transformer circuit is connected between the second switch component and the fourth switch component.

[0007] Further, the DC / AC control full-bridge inverter circuit further comprises a plurality of series capacitors, and the plurality of series capacitors are connected between the input end and the output end.

[0008] Furthermore, the first, second, third, and fourth switching components each include a control output terminal, a resistor, a diode, a field-effect transistor, a Zener diode, and a capacitor; the control output terminal, the resistor, and the gate of the field-effect transistor are connected in sequence, the diode is connected in parallel with the resistor, and the source and drain of the field-effect transistor are connected in parallel with the Zener diode and the capacitor, respectively.

[0009] Furthermore, the transformer circuit also includes a signal amplification circuit, and the controller, signal amplification circuit, control switch and transformer circuit are connected in sequence.

[0010] Furthermore, the control switch is a relay switch.

[0011] Furthermore, the number of transformer circuits is five, and the transformer windings are respectively: first preset value, second preset value, third preset value, fourth preset value and fifth preset value.

[0012] Furthermore, the output voltage of the AC / DC power input full-bridge rectifier circuit is 115-230V.

[0013] Furthermore, the input voltage of the DC / DC power input / output circuit is 100-300V, and the output voltage is 0-200V.

[0014] According to another aspect of the present invention, an AC power supply is also provided, including the power supply circuit of the above embodiment.

[0015] Compared with the prior art, the embodiments of this application have the following beneficial effects:

[0016] The circuit includes an AC / DC power input full-bridge rectifier circuit, a DC / DC power input / output circuit, a DC / AC control full-bridge inverter circuit, multiple transformer circuits, and a controller. The AC / DC power input full-bridge rectifier circuit, DC / DC power input / output circuit, and DC / AC control full-bridge inverter circuit are connected sequentially, and the DC / AC control full-bridge inverter circuit is connected to each transformer circuit. Each transformer circuit includes a control switch and a transformer circuit. The control switch receives signals from the controller to turn the transformer circuit on or off. The circuit provided in this embodiment can turn on the required transformer and turn off other transformers according to control commands to achieve the output of the corresponding required AC voltage. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a power supply circuit provided in an embodiment of this application.

[0019] Figure 2 This is a schematic diagram of a DC / AC controlled full-bridge inverter circuit provided in an embodiment of this application.

[0020] Figure 3 This is a schematic diagram of a transformer circuit provided in an embodiment of this application. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0022] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0023] like Figure 1 As shown, Figure 1This is a schematic diagram of a power supply circuit provided in an embodiment of this application. The power supply circuit includes an AC / DC power input full-bridge rectifier circuit 10, a DC / DC power input / output circuit 20, a DC / AC control full-bridge inverter circuit 30, multiple transformer circuits 40, and a controller (not shown). The AC / DC power input full-bridge rectifier circuit, the DC / DC power input / output circuit, and the DC / AC control full-bridge inverter circuit are connected in sequence, and the DC / AC control full-bridge inverter circuit is connected to each transformer circuit. Each transformer circuit includes a control switch and a transformer circuit. The control switch is used to receive signals from the controller to turn the transformer circuit on or off.

[0024] In this embodiment, each transformer has different windings, so the required transformer can be turned on and other transformers can be turned off according to control commands to achieve the output of the corresponding required AC voltage. These control commands can be issued by the user through button operations for the desired voltage. The number of transformer circuits is set according to requirements, thereby expanding the voltage range.

[0025] In some embodiments, such as Figure 2 As shown, the DC / AC controlled full-bridge inverter circuit includes an input terminal J1, a first switching assembly, a second switching assembly, a third switching assembly, a fourth switching assembly, and an output terminal J2. The input terminal is connected to the first switching assembly and the second switching assembly, and the output terminal is connected to the third switching assembly and the fourth switching assembly. The first switching assembly and the third switching assembly are connected together, and the second switching assembly and the fourth switching assembly are connected together. A transformer circuit is connected between the first switching assembly and the third switching assembly, and a transformer circuit is connected between the second switching assembly and the fourth switching assembly, and a transformer circuit is connected between the other end of the transformer, VS2.

[0026] In some embodiments, such as Figure 2 As shown, the DC / AC controlled full-bridge inverter circuit also includes multiple series capacitors (C10, C11 and C13), and multiple series capacitors are connected between the input terminal and the output terminal.

[0027] In some embodiments, such as Figure 2 As shown, the first switching assembly includes a control output terminal HO, a resistor R3, a diode D41, a field-effect transistor Q1, a Zener diode D22, and a capacitor C39. The control output terminal, the resistor, and the gate of the field-effect transistor are connected in sequence. The diode is connected in parallel with the resistor, and the source and drain of the field-effect transistor are connected in parallel with the Zener diode and the capacitor, respectively. The second, third, and fourth switching assemblies are similar and will not be described in detail here.

[0028] In this embodiment, the control output terminal plays the role of controlling the switch to turn on and off, which is a conventional technology and will not be described in detail here.

[0029] In some embodiments, such as Figure 3 As shown, the transformer circuit also includes a signal amplification circuit (resistor R67, resistor R70 and transistor Q8), and the controller, signal amplification circuit, control switch and transformer circuit H1 are connected in sequence.

[0030] In this embodiment, the controller is connected to the PC4 pin to transmit the signal to the signal amplification circuit.

[0031] In some embodiments, the control switch is a relay switch K1.

[0032] It should be noted that when K1 receives a high level, the switch is connected. Figure 3 The state is such that accepting a low level will result in the opposite. Figure 3 H1 represents the open circuit state, and 3 and 1 represent the first and second ends of the winding, respectively. When the relay connects 1 and 2, it represents the closed circuit state.

[0033] In some embodiments, the number of transformer circuits is five, and the transformer windings are respectively: a first preset value, a second preset value, a third preset value, a fourth preset value, and a fifth preset value.

[0034] In some embodiments, the output voltage of the AC / DC power input full-bridge rectifier circuit is 115-230V.

[0035] In some embodiments, the input voltage of the DC / DC power input / output circuit is 100-300V, and the output voltage is 0-200V.

[0036] It should be noted that the AC / DC power input full-bridge rectifier circuit and the DC / DC power input / output circuit are common rectification and voltage regulation modules, and will not be specifically described here. This embodiment achieves frequency and voltage regulation of AC voltage by setting a certain voltage range. This frequency and voltage regulation is achieved by controlling the control signal at the output terminal using conventional algorithm control technology. For example, a preset value can be set between 5kHz and 100kHz. Here, the preset value refers to the frequency range of the frequency modulation, which can be adjusted as needed.

[0037] The above description is only a preferred embodiment of this patent, but the protection scope of this patent is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed in this patent, based on the technical solution and utility model concept of this patent, shall fall within the protection scope of this patent.

Claims

1. A power supply circuit, characterized in that, It includes an AC / DC power input full-bridge rectifier circuit, a DC / DC power input and output circuit, a DC / AC control full-bridge inverter circuit, multiple transformer circuits, and a controller; The AC / DC power input full-bridge rectifier circuit, the DC / DC power input and output circuit, and the DC / AC control full-bridge inverter circuit are connected in sequence. The DC / AC control full-bridge inverter circuit is connected to each transformer circuit respectively. Each transformer circuit includes a control switch and a transformer circuit. The control switch is used to receive signals from the controller to turn the transformer circuit on or off.

2. The power supply circuit according to claim 1, characterized in that, The DC / AC controlled full-bridge inverter circuit includes an input terminal, a first switching assembly, a second switching assembly, a third switching assembly, a fourth switching assembly, and an output terminal. The input terminals are connected to the first switch assembly and the second switch assembly respectively, and the output terminals are connected to the third switch assembly and the fourth switch assembly respectively. The first switch assembly is connected to the third switch assembly, and the second switch assembly is connected to the fourth switch assembly. One end of a transformer circuit is connected between the first and third switching assemblies, and the other end of a transformer circuit is connected between the second and fourth switching assemblies.

3. The power supply circuit according to claim 2, characterized in that, The DC / AC controlled full-bridge inverter circuit also includes multiple series capacitors, with multiple series capacitors connected between the input and output terminals.

4. The power supply circuit according to claim 2, characterized in that, The first, second, third, and fourth switching components each include a control output terminal, a resistor, a diode, a field-effect transistor, a Zener diode, and a capacitor; The control output terminal, resistor, and gate of the field-effect transistor are connected in sequence. The diode is connected in parallel with the resistor. The source and drain of the field-effect transistor are connected in parallel with the Zener diode and the capacitor, respectively.

5. The power supply circuit according to claim 1, characterized in that, The transformer circuit also includes a signal amplification circuit, and the controller, signal amplification circuit, control switch and transformer circuit are connected in sequence.

6. The power supply circuit according to claim 4, characterized in that, The control switch is a relay switch.

7. The power supply circuit according to claim 1, characterized in that, The transformer circuit has five windings, and the transformer windings are respectively: first preset value, second preset value, third preset value, fourth preset value and fifth preset value.

8. The power supply circuit according to claim 1, characterized in that, The output voltage of the AC / DC power input full-bridge rectifier circuit is 115-230V.

9. The power supply circuit according to claim 1, characterized in that, The input voltage of the DC / DC power input / output circuit is 100-300V, and the output voltage is 0-200V.

10. An AC power supply, characterized in that, Includes the power supply circuit as described in any one of claims 1 to 9.

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