Series-parallel dual-voltage output system for variable frequency generator set

Abstract

The utility model discloses a series-parallel dual-voltage output system for a variable-frequency generator set, which comprises a first variable-frequency generator, a second variable-frequency generator and a switch switching device, the output end of the first variable frequency generator is connected with the first input end of the switch switching device, and the output end of the second variable frequency generator is connected with the second input end of the switch switching device; when the switch switching device is switched to be in a series connection mode, the output end of the switch switching device is connected with the first interface, and a first voltage is output; when the switch switching device is switched to the parallel connection mode, the output end of the switch switching device is connected with the second interface, and a second voltage is output. According to the utility model, the connection states of the first variable-frequency generator and the second variable-frequency generator are switched through the switch switching device, so that the generator set can realize dual-voltage output of the first voltage and the second voltage under the condition that the use effect of a single generator set is not changed, and the requirements of different working environments are met.

Description

Technical Field

[0001] The utility model relates to the technical field of generators, in particular to a series-parallel dual-voltage output system for a variable-frequency generator set. Background Art

[0002] With the development of society and people's needs, frequency converters are becoming more and more popular due to their compact structure and power generation function.

[0003] However, in the prior art, small frequency converters can generally only output 120V voltage due to limited space structure and cannot achieve dual voltage (120V / 240V) output, resulting in the inability to meet high voltage requirements and having great limitations in use. Summary of the invention

[0004] Aiming at the problem that small and medium-sized frequency converters in the prior art cannot achieve dual-voltage output, the utility model proposes a series-parallel dual-voltage output system for a frequency converter generator set.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A series-parallel dual-voltage output system for a variable frequency generator set, comprising a first variable frequency generator, a second variable frequency generator, and a switch switching device;

[0007] The output end of the first variable frequency generator is connected to the first input end of the switch device, and the output end of the second variable frequency generator is connected to the second input end of the switch device;

[0008] When the switch switching device is switched to the series mode, the output end of the switch switching device is connected to the first interface and outputs the first voltage; when the switch switching device is switched to the parallel mode, the output end of the switch switching device is connected to the second interface and outputs the second voltage.

[0009] Preferably, the first variable frequency generator is provided with a first inverter (T1), and the second variable frequency generator is provided with a second inverter (T2).

[0010] Preferably, the first input end of the switch switching device includes a first switch and a second switch; the second input end of the switch switching device includes a third switch and a fourth switch.

[0011] Preferably, the first switch, the second switch, the third switch and the fourth switch are single-pole double-throw switches.

[0012] Preferably, when the switch switching device is switched to the series mode, it includes a first circuit, a second circuit, a third circuit and a fourth circuit; wherein,

[0013] The first circuit comprises:

[0014] The first output positive electrode (AC_H1) of the first inverter (T1) is connected to the input end (2) of the first switch, the input end (2) of the first switch and the first output end (1) of the first switch are conductive, and the first output end (1) of the first switch is connected to the first end (a) of the first interface (U1);

[0015] The second circuit comprises:

[0016] The first output cathode (AC_L1) of the first inverter (T1) is connected to the input end (5) of the second switch, the input end (5) of the second switch and the first output end (4) of the second switch are conductive, and the first output end (4) of the second switch is connected to the third end (c) of the first interface (U1) after passing through the first circuit breaker (QF1) and the second circuit breaker (QF2) in sequence;

[0017] The third circuit comprises:

[0018] The second output positive electrode (AC_H2) of the second inverter (T2) is connected to the input end (8) of the third switch, the input end (8) of the third switch and the first output end (7) of the third switch are conductive, and the first output end (7) of the third switch is connected to the second end (b) of the first interface (U1) through a third circuit breaker (QF3);

[0019] The fourth circuit comprises:

[0020] The second output cathode (AC_L2) of the second inverter (T2) is connected to the input end (11) of the fourth switch, the input end (11) of the fourth switch and the first output end (10) of the fourth switch are conductive, and the first output end (10) of the fourth switch is connected to the first end (a) of the first interface (U1).

[0021] Preferably, the rated current of the first circuit breaker (QF1), the second circuit breaker (QF2), and the third circuit breaker (QF3) is 30A.

[0022] Preferably, the first grounding terminal of the first inverter (T1), the second grounding terminal of the second inverter (T2), and the fourth terminal (d) of the first interface (U1) are connected in parallel and then grounded.

[0023] Preferably, the first phase line (S1_1) of the first inverter (T1) is connected to the fourth phase line (S2_4) of the second inverter (T2); the second phase line (S1_2) of the first inverter (T1) is connected to the third phase line (S2_3) of the second inverter (T2); the third phase line (S1_3) of the first inverter (T1) is connected to the second phase line (S2_2) of the second inverter (T2); and the fourth phase line (S1_4) of the first inverter (T1) is connected to the first phase line (S2_1) of the second inverter (T2).

[0024] Preferably, when the switch switching device is switched to the parallel mode, it includes a fifth circuit, a sixth circuit, a seventh circuit and an eighth circuit; wherein,

[0025] The fifth circuit comprises:

[0026] The first output positive electrode (AC_H1) of the first inverter (T1) is connected to the input end (2) of the first switch, the input end (2) of the first switch and the second output end (3) of the first switch are conductive, and the second output end (3) of the first switch is connected to the first end (U21) of the second interface (U2);

[0027] The sixth circuit comprises:

[0028] The first output cathode (AC_L1) of the first inverter (T1) is connected to the input end (5) of the second switch, the input end (5) of the second switch and the second output end (6) of the second switch are conductive, and the second output end (6) of the second switch is connected to the second end (U22) and the third end (U23) of the second interface (U2) through a fourth circuit breaker (QF4);

[0029] The seventh circuit includes:

[0030] The second output positive electrode (AC_H2) of the second inverter (T2) is connected to the input end (8) of the third switch, the input end (8) of the third switch and the second output end (9) of the third switch are conductive, and the second output end (9) of the third switch is connected to the first end (U21) of the second interface (U2);

[0031] The eighth circuit comprises:

[0032] The second output cathode (AC_L2) of the second inverter (T2) is connected to the input end (11) of the fourth switch, the input end (11) of the fourth switch and the second output end (12) of the fourth switch are conductive, and the second output end (12) of the fourth switch is connected to the second end (U22) and the third end (U23) of the second interface (U2) through a fourth circuit breaker (QF4).

[0033] Preferably, the rated current of the fourth circuit breaker (QF4) is 50A.

[0034] In summary, due to the adoption of the above technical solution, compared with the prior art, the utility model has at least the following beneficial effects:

[0035] The utility model switches the connection status of the first variable frequency generator and the second variable frequency generator through a switch switching device, thereby solving the disadvantage that conventional small-scale variable frequency machines cannot have dual voltage outputs. When the effect of a single unit remains unchanged, the generator set can achieve dual voltage outputs of the first voltage and the second voltage, thereby meeting the needs of different working environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The figure is a schematic diagram of a series-parallel dual-voltage output system for a variable frequency generator set according to an exemplary embodiment of the present utility model.

[0037] Figure 2 It is a schematic diagram of the series mode according to exemplary embodiment 1 of the present utility model.

[0038] Figure 3 It is a schematic diagram of the parallel mode according to exemplary embodiment 2 of the present utility model. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below in conjunction with the embodiments and specific implementation methods. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0040] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] like Figure 1 As shown, the utility model provides a series-parallel dual-voltage output system for a variable frequency generator set, comprising a first variable frequency generator, a second variable frequency generator and a switch switching device, wherein the output end of the first variable frequency generator is connected to the first input end of the switch switching device, and the output end of the second variable frequency generator is connected to the second input end of the switch switching device; when the switch switching device is switched to a series mode, the output end of the switch switching device is connected to a first interface to output a first voltage; when the switch switching device is switched to a parallel mode, the output end of the switch switching device is connected to a second interface to output a second voltage.

[0042] In this embodiment, the connection status of the first variable frequency generator and the second variable frequency generator is switched by the switch switching device, so that the generator set can achieve dual voltage output of the first voltage and the second voltage to meet the needs of different working environments.

[0043] In this embodiment, a first inverter T1 is provided in the first variable frequency generator, and a second inverter T2 is provided in the second variable frequency generator; the first input end of the switch switching device K1 includes a first switch and a second switch, and the first switch and the second switch are both single-pole double-throw switches; the second input end of the switch switching device K1 includes a third switch and a fourth switch, and the third switch and the fourth switch are both single-pole double-throw switches.

[0044] In this embodiment, the output voltages of the first variable frequency generator and the second variable frequency generator are 120V respectively.

[0045] Example 1

[0046] Specifically, Figure 2 As shown, when the switch device K1 is switched to the series mode, it includes a first circuit, a second circuit, a third circuit and a fourth circuit.

[0047] Specifically, the first circuit includes:

[0048] The first output positive electrode (AC_H1) of the first inverter T1 is connected to the input end (2) of the first switch, the input end (2) of the first switch and the first output end (1) of the first switch are conductive, and the first output end (1) of the first switch is connected to the first end (a) of the first interface (U1);

[0049] Specifically, the second circuit includes:

[0050] The first output negative electrode (AC_L1) of the first inverter T1 is connected to the input end (5) of the second switch, the input end (5) of the second switch and the first output end (4) of the second switch are conductive, and the first output end (4) of the second switch is connected to the third end (c) of the first interface (U1) after passing through the first circuit breaker (QF1) and the second circuit breaker (QF2) in sequence;

[0051] Specifically, the third circuit includes:

[0052] The second output positive electrode (AC_H2) of the second inverter T2 is connected to the input end (8) of the third switch, the input end (8) of the third switch and the first output end (7) of the third switch are conductive, and the first output end (7) of the third switch is connected to the second end (b) of the first interface (U1) through the third circuit breaker (QF3);

[0053] Specifically, the fourth circuit includes:

[0054] The second output cathode (AC_L2) of the second inverter T2 is connected to the input end (11) of the fourth switch, the input end (11) of the fourth switch and the first output end (10) of the fourth switch are conductive, and the first output end (10) of the fourth switch is connected to the first end (a) of the first interface (U1).

[0055] Among them, the rated current of the first circuit breaker (QF1), the second circuit breaker (QF2), and the third circuit breaker (QF3) is 30A.

[0056] It also includes that a first grounding terminal (GND1) of the first inverter T1, a second grounding terminal (GND2) of the second inverter T2, and a fourth terminal (d) of the first interface (U1) are connected in parallel and then grounded.

[0057] In this embodiment, in order to make the output phases of the first inverter T1 and the second inverter T2 consistent and the voltage waveform tracks overlap, it also includes:

[0058] The first phase line (S1_1) of the first inverter T1 is connected to the fourth phase line (S2_4) of the second inverter T2; the second phase line (S1_2) of the first inverter T1 is connected to the third phase line (S2_3) of the second inverter T2; the third phase line (S1_3) of the first inverter T1 is connected to the second phase line (S2_2) of the second inverter T2; the fourth phase line (S1_4) of the first inverter T1 is connected to the first phase line (S2_1) of the second inverter T2.

[0059] The patent (CN202320123818.7) discloses a generator control system that realizes the series-parallel function, in which the phase lines of the two inverters are connected to the series-parallel box, and the phase matching is achieved by collecting the back-end voltage. The phase cannot be matched without shutting down and switching the inverter.

[0060] However, in this embodiment, when the phase lines of the first inverter T1 and the second inverter T2 are connected, it indicates that the two inverters are matched successfully (for example, the first inverter T1 sends a phase matching signal to the second inverter T2, and the second inverter T2 is matched successfully after receiving the phase matching signal). After the matching is successful, the two inverters can achieve voltage switching without shutting down, thereby improving the phase matching quality.

[0061] In this embodiment, when the switch device K1 is switched to the series mode, the voltage output by the first interface (U1) is 240V.

[0062] Example 2

[0063] Specifically, Figure 3 As shown, when the switch device K1 is switched to the parallel mode, it includes a fifth circuit, a sixth circuit, a seventh circuit and an eighth circuit.

[0064] Specifically, the fifth circuit includes:

[0065] The first output positive electrode (AC_H1) of the first inverter T1 is connected to the input end (2) of the first switch, the input end (2) of the first switch and the second output end (3) of the first switch are conductive, and the second output end (3) of the first switch is connected to the first end (U21) of the second interface (U2);

[0066] Specifically, the sixth circuit includes:

[0067] The first output cathode (AC_L1) of the first inverter T1 is connected to the input end (5) of the second switch, the input end (5) of the second switch and the second output end (6) of the second switch are conductive, and the second output end (6) of the second switch is connected to the second end (U22) and the third end (U23) of the second interface (U2) through a fourth circuit breaker (QF4);

[0068] Specifically, the seventh circuit includes:

[0069] The second output positive electrode (AC_H2) of the second inverter T2 is connected to the input end (8) of the third switch, the input end (8) of the third switch and the second output end (9) of the third switch are conductive, and the second output end (9) of the third switch is connected to the first end (U21) of the second interface (U2);

[0070] Specifically, the eighth circuit includes:

[0071] The second output negative electrode (AC_L2) of the second inverter T2 is connected to the input end (11) of the fourth switch, the input end (11) of the fourth switch and the second output end (12) of the fourth switch are conductive, and the second output end (12) of the fourth switch is connected to the second end (U22) and the third end (U23) of the second interface (U2) through a fourth circuit breaker (QF4).

[0072] Among them, the rated current of the fourth circuit breaker (QF4) is 50A.

[0073] In this embodiment, the first ground terminal (GND1) of the first inverter T1, the second ground terminal (GND2) of the second inverter T2, and the fourth terminal (U24) of the second interface (U2) are connected in parallel and then grounded.

[0074] In this embodiment, in order to make the output phases of the first inverter T1 and the second inverter T2 consistent and the voltage waveform tracks overlap, it also includes:

[0075] The first phase line (S1_1) of the first inverter T1 is connected to the fourth phase line (S2_4) of the second inverter T2; the second phase line (S1_2) of the first inverter T1 is connected to the third phase line (S2_3) of the second inverter T2; the third phase line (S1_3) of the first inverter T1 is connected to the second phase line (S2_2) of the second inverter T2; the fourth phase line (S1_4) of the first inverter T1 is connected to the first phase line (S2_1) of the second inverter T2.

[0076] When the phase lines of the first inverter T1 and the second inverter T2 are connected, it indicates that the two inverters are matched successfully (for example, the first inverter T1 sends a phase matching signal to the second inverter T2, and the second inverter T2 is matched successfully after receiving the phase matching signal). After the matching is successful, the two inverters can achieve voltage switching without shutting down, thereby improving the phase matching quality.

[0077] In this embodiment, when the switch device K1 is switched to the parallel mode, the voltage output by the second interface (U2) is 120V.

[0078] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A series-parallel dual-voltage output system for a variable frequency generator set, comprising a first variable frequency generator and a second variable frequency generator, characterized in that: Also included is a switch switching device; The output end of the first variable frequency generator is connected to the first input end of the switch device, and the output end of the second variable frequency generator is connected to the second input end of the switch device; When the switch switching device is switched to the series mode, the output end of the switch switching device is connected to the first interface and outputs the first voltage; when the switch switching device is switched to the parallel mode, the output end of the switch switching device is connected to the second interface and outputs the second voltage.

2. A series-parallel dual-voltage output system for a variable frequency generator set as claimed in claim 1, characterized in that: The first variable frequency generator is provided with a first inverter (T1), and the second variable frequency generator is provided with a second inverter (T2).

3. A series-parallel dual-voltage output system for a variable frequency generator set as claimed in claim 2, characterized in that: The first input end of the switch switching device includes a first switch and a second switch; the second input end of the switch switching device includes a third switch and a fourth switch.

4. A series-parallel dual-voltage output system for a variable frequency generator set as claimed in claim 3, characterized in that: The first switch, the second switch, the third switch and the fourth switch are single-pole double-throw switches.

5. A series-parallel dual-voltage output system for a variable frequency generator set as claimed in claim 1, characterized in that: When the switch switching device is switched to the series mode, it includes a first circuit, a second circuit, a third circuit and a fourth circuit; wherein, The first circuit comprises: The first output positive electrode (AC_H1) of the first inverter (T1) is connected to the input end (2) of the first switch, the input end (2) of the first switch and the first output end (1) of the first switch are conductive, and the first output end (1) of the first switch is connected to the first end (a) of the first interface (U1); The second circuit comprises: The first output cathode (AC_L1) of the first inverter (T1) is connected to the input end (5) of the second switch, the input end (5) of the second switch and the first output end (4) of the second switch are conductive, and the first output end (4) of the second switch is connected to the third end (c) of the first interface (U1) after passing through the first circuit breaker (QF1) and the second circuit breaker (QF2) in sequence; The third circuit comprises: The second output positive electrode (AC_H2) of the second inverter (T2) is connected to the input end (8) of the third switch, the input end (8) of the third switch and the first output end (7) of the third switch are conductive, and the first output end (7) of the third switch is connected to the second end (b) of the first interface (U1) through a third circuit breaker (QF3); The fourth circuit comprises: The second output cathode (AC_L2) of the second inverter (T2) is connected to the input end (11) of the fourth switch, the input end (11) of the fourth switch and the first output end (10) of the fourth switch are conductive, and the first output end (10) of the fourth switch is connected to the first end (a) of the first interface (U1).

6. A series-parallel dual-voltage output system for a variable frequency generator set as claimed in claim 5, characterized in that: The rated current of the first circuit breaker (QF1), the second circuit breaker (QF2), and the third circuit breaker (QF3) is 30A.

7. A series-parallel dual-voltage output system for a variable frequency generator set as claimed in claim 5, characterized in that: The first grounding terminal of the first inverter (T1), the second grounding terminal of the second inverter (T2), and the fourth terminal (d) of the first interface (U1) are connected in parallel and then grounded.

8. A series-parallel dual-voltage output system for a variable frequency generator set as claimed in claim 5, characterized in that: The first phase line (S1_1) of the first inverter (T1) is connected to the fourth phase line (S2_4) of the second inverter (T2); the second phase line (S1_2) of the first inverter (T1) is connected to the third phase line (S2_3) of the second inverter (T2); the third phase line (S1_3) of the first inverter (T1) is connected to the second phase line (S2_2) of the second inverter (T2); and the fourth phase line (S1_4) of the first inverter (T1) is connected to the first phase line (S2_1) of the second inverter (T2).

9. A series-parallel dual-voltage output system for a variable frequency generator set as claimed in claim 1, characterized in that: When the switch switching device is switched to the parallel mode, it includes a fifth circuit, a sixth circuit, a seventh circuit and an eighth circuit; wherein, The fifth circuit comprises: The first output positive electrode (AC_H1) of the first inverter (T1) is connected to the input end (2) of the first switch, the input end (2) of the first switch and the second output end (3) of the first switch are conductive, and the second output end (3) of the first switch is connected to the first end (U21) of the second interface (U2); The sixth circuit comprises: The first output cathode (AC_L1) of the first inverter (T1) is connected to the input end (5) of the second switch, the input end (5) of the second switch and the second output end (6) of the second switch are conductive, and the second output end (6) of the second switch is connected to the second end (U22) and the third end (U23) of the second interface (U2) through a fourth circuit breaker (QF4); The seventh circuit includes: The second output positive electrode (AC_H2) of the second inverter (T2) is connected to the input end (8) of the third switch, the input end (8) of the third switch and the second output end (9) of the third switch are conductive, and the second output end (9) of the third switch is connected to the first end (U21) of the second interface (U2); The eighth circuit comprises: The second output cathode (AC_L2) of the second inverter (T2) is connected to the input end (11) of the fourth switch, the input end (11) of the fourth switch and the second output end (12) of the fourth switch are conductive, and the second output end (12) of the fourth switch is connected to the second end (U22) and the third end (U23) of the second interface (U2) through a fourth circuit breaker (QF4).

10. A series-parallel dual-voltage output system for a variable frequency generator set as claimed in claim 9, characterized in that: The rated current of the fourth circuit breaker (QF4) is 50A.

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