A voltage regulator using zero-crossing transfer of an electric relay and its connection circuit

Abstract

The present invention relates to the technical field of voltage stabilizing equipment, specifically a voltage stabilizer using zero-crossing transfer of a power relay and its connection circuit, including a housing base, a circuit board, a QF circuit breaker, a transformer group, and an upper cover. The input end of transformer T2 is connected to the power supply side UA through the secondary winding of transformer T1 and the QF circuit breaker. The four secondary windings of transformer T2 respectively form two sets of step-up and step-down windings, which are formed into four groups through power relays J1 to J8 and are combined and connected to the primary winding of transformer T1. The control end of the power relay is connected to the single-chip microcomputer control circuit system. The step-up and step-down windings of the present invention can achieve the purpose of boosting the circuit by 10 - 70V and stepping down by 10 - 35V through the transfer of 8 power relays. The single-chip microcomputer sets the program to control the power relay to close at the zero-crossing of the voltage and separate at the zero-crossing of the current. It has the characteristics of small volume, low cost, fast response time, and strong load adaptability, and also has advantages such as digital display of electrical parameters. It has strong zero-crossing transfer and load adaptability.

Description

Technical Field

[0001] The present invention relates to the technical field of voltage stabilizing equipment, and specifically to a voltage stabilizer using zero-crossing transfer of a power relay and its connection circuit. Background Art

[0002] At present, in the power field, the number of electrical equipment is increasing day by day. However, due to the aging and lagging development of power transmission and distribution facilities, excessive line voltage drop in long transmission circuits, as well as poor design and insufficient power supply, the voltage at the end users is too low, while the voltage at the front-end users is often too high, thus affecting the normal operation of the load. Unstable voltage can cause damage or malfunction to the equipment, resulting in various losses such as production disruption and unstable quality. Therefore, the use of a voltage stabilizer is essential for electrical equipment, especially for numerically controlled equipment and precision instruments with strict voltage requirements.

[0003] Currently, common voltage stabilizer devices on the market include ordinary relay transfer type autotransformers, carbon brush contact type compensating power voltage stabilizers, thyristor control compensating type voltage stabilizers, etc. The ordinary relay transfer type voltage stabilizer has defects such as short contact life, and the contacts are easily burned and adhered by arc sparks when the current is too large, so the designed maximum power can only reach below 10KW. The thyristor control compensating type voltage stabilizer has the defect of poor harmonic resistance, and there are often disadvantages such as misfiring and short-circuit damage of the thyristor. Secondly, the thyristor requires a radiator for cooling and has a high cost. The existing voltage stabilizers have a complex internal structure, and are not convenient for installation, maintenance and disassembly operations, and have many internal electronic components with poor heat dissipation effect. In view of this, we provide a voltage stabilizer using zero-crossing transfer of a power relay and its connection circuit. Summary of the Invention

[0004] The purpose of the present invention is to provide a voltage stabilizer using zero-crossing transfer of a power relay and its connection circuit to solve the problems of short contact life, easy burning and adhesion of contacts by arc sparks when the current is too large, high cost, and complex internal structure of the current voltage stabilizers as mentioned in the above background art.

[0005] To achieve the above object, on the one hand, the present invention provides the following technical solution: A voltage regulator using a zero-crossing transfer of an electric relay, including a housing base, on one inner wall of the housing base, a wiring row is installed, on one side wall of the housing base, a circuit breaker mounting bracket is provided, on the side wall of the housing base, base heat dissipation holes are opened, on the bottom surface of the housing base, transformer fixing holes and circuit board fixing holes are opened; the housing base is connected to a circuit board through the circuit board fixing holes, at the bottom of the circuit board, a mounting seat is provided, at the four top corners of the mounting seat, mounting holes are opened, and the circuit board is threadedly connected to the housing base through fixing bolts sequentially passing through the mounting holes and the circuit board fixing holes; inside the circuit breaker mounting bracket, a QF circuit breaker is installed, the QF circuit breaker is clamped inside the circuit breaker mounting bracket, the housing base is connected to a transformer group through the transformer fixing holes, the transformer group is provided with four L-shaped fixing feet, on the L-shaped fixing feet, transformer mounting holes are opened, and the transformer group is threadedly connected to the housing base through fixing bolts sequentially passing through the transformer mounting holes and the transformer fixing holes, the top of the housing base is connected to an upper cover, and the upper cover is clamped and matched with the housing base.

[0006] Preferably, the mounting seat and the circuit board are of an integrally formed structure, the L-shaped fixing feet and the transformer group are of an integrally formed structure, on the transformer group, a wiring seat is connected, and on the wiring seat, a number of wiring columns are connected in a uniform and equidistant linear arrangement.

[0007] Preferably, the transformer group includes a transformer T1 and a transformer T2, and on the circuit board, 9 groups of circuit relays J1-J9 are provided.

[0008] Preferably, on the side of the upper cover, a number of upper cover heat dissipation holes are opened in a uniform and equidistant linear arrangement, on the top surface of the upper cover, a groove is opened, inside the groove, a display screen fixing seat is provided, and inside the display screen fixing seat, a display screen is installed.

[0009] Preferably, at the four top corners of the display screen fixing seat, display screen fixing holes are opened, the display screen is connected to a display screen mounting seat, and at the four top corners of the display screen mounting seat, display screen mounting holes corresponding to the positions of the display screen fixing holes and having matching dimensions are opened.

[0010] Preferably, the display screen mounting seat and the display screen are of an integrally formed structure, and the display screen is threadedly connected to the upper cover through fixing bolts sequentially passing through the display screen mounting holes and the display screen fixing holes.

[0011] On the other hand, the present invention also provides a voltage regulator connection circuit using a zero-crossing transfer of a power relay, including the voltage regulator with zero-crossing transfer of the power relay described in any one of the above, including a transformer T1, a transformer T2, a QF circuit breaker, and power relays J1 to J8. The input end of the transformer T2 is connected to the power supply side UA through the secondary winding of the transformer T1 and the QF circuit breaker. The four secondary windings of the transformer T2 respectively form two sets of step-up and step-down windings, which form four groups through the power relays J1 to J8 and are combined and connected to the primary winding of the transformer T1. The control end of the power relay is connected to the single-chip microcomputer control circuit system.

[0012] Preferably, the primary winding of the transformer T2 and the QF circuit breaker are connected through the secondary winding of the transformer T1, and the four secondary windings of the transformer T2 can form a step-up combination, a step-down combination, a step-up and step-down combination mode.

[0013] Preferably, the power relays J1 to J8 are grouped into four groups and are respectively connected to the secondary windings of the transformer T2. The contacts of the power relays J1 to J4 are respectively connected to the two 28V secondary windings of the transformer T2 to form a first set of step-up and step-down combinations; the contacts of the power relays J5 to J8 are respectively connected to the two 7V secondary windings of the transformer T2 to form a second set of step-up and step-down combinations. The step-up and step-down amplitude of the first set of step-up and step-down combination windings is ±28V; the step-up and step-down amplitude of the second set of step-up and step-down combination windings is ±7V.

[0014] Preferably, the zero-crossing opening and closing of the power relay are both controlled by the output instructions in the single-chip microcomputer.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. The voltage regulator using the zero-crossing transfer of the power relay fixes the circuit board, the QF circuit breaker, and the transformer group to the housing base through fixed bolts with threads, which is convenient for installation, maintenance, and replacement, saves costs, and has a more stable structure. All parts are placed in the housing base and protected by the upper cover to achieve a dust-proof effect, extend the service life of the internal parts. At the same time, the base heat dissipation holes provided on the side wall of the housing base and the upper cover heat dissipation holes provided on the side wall of the upper cover improve the heat dissipation efficiency of the internal electronic parts during operation, prevent the internal parts from being burned due to overheating, and reduce the maintenance cost.

[0017] 2. In the connection circuit of the voltage regulator using zero-crossing transfer of power relays, the step-up and step-down windings can achieve the purpose of boosting the circuit voltage by 10 - 70V and reducing the voltage by 10 - 35V through the transfer of 8 power relays. The single-chip microcomputer sets the program to control the power relays to close when the voltage crosses zero and separate when the current crosses zero. It has the characteristics of small volume, low cost, fast response time, and strong load adaptability. It also has advantages such as digital display of electrical parameters. The zero-crossing transfer and strong load adaptability effectively solve the above-mentioned deficiencies of the existing voltage regulators and other problems. Brief Description of the Drawings

[0018] Figure 1 Schematic diagram of the internal structure of the housing base of the present invention;

[0019] Figure 2 Structural diagram of the housing base of the present invention;

[0020] Figure 3 Schematic diagram of the structure of the circuit board in the present invention;

[0021] Figure 4 Schematic diagram of the structure of the QF circuit breaker in the present invention;

[0022] Figure 5 Schematic diagram of the structure of the transformer bank in the present invention;

[0023] Figure 6 Schematic diagram of the structure of the display screen of the present invention;

[0024] Figure 7 Schematic diagram of the structure of the upper cover of the present invention;

[0025] Figure 8 Schematic diagram of one of the circuit principles of the voltage regulator of the present invention;

[0026] Figure 9 Schematic diagram of another circuit principle of the voltage regulator of the present invention.

[0027] In the figure: 1. Housing base; 11. Terminal block; 12. Circuit breaker mounting bracket; 13. Base heat dissipation holes; 14. Transformer fixing holes; 15. Circuit board fixing holes; 2. Circuit board; 21. Mounting seat; 22. Mounting holes; 3. QF circuit breaker; 4. Transformer bank; 41. L-shaped fixing feet; 42. Transformer mounting holes; 43. Wiring seat; 44. Wiring posts; 45. Transformer T1; 46. Transformer T2; 5. Upper cover; 51. Grooves; 52. Display screen fixing seat; 53. Display screen fixing holes; 54. Upper cover heat dissipation holes; 6. Display screen; 61. Display screen mounting seat; 62. Display screen mounting holes. Detailed Embodiments

[0028] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 construed as a limitation to the present invention.

[0030] Embodiment 1

[0031] A voltage stabilizer using zero-crossing transfer of an electric relay, as Figure 1 , Figure 2 and Figure 4 shown, includes a housing base 1. A wiring terminal block 11 is installed on one inner wall of the housing base 1. A circuit breaker mounting bracket 12 is provided on one side wall of the housing base 1. Base heat dissipation holes 13 are opened on the side wall of the housing base 1. Transformer fixing holes 14 and circuit board fixing holes 15 are opened on the bottom surface of the housing base 1; the housing base 1 is connected to a circuit board 2 through the circuit board fixing holes 15, as Figure 3 shown. An installation seat 21 is provided at the bottom of the circuit board 2. Installation holes 22 are opened at the four top corners of the installation seat 21. The circuit board 2 is threadedly connected to the housing base 1 through the fixing bolts passing through the installation holes 22 and the circuit board fixing holes 15 in sequence; a QF circuit breaker 3 is installed in the circuit breaker mounting bracket 12. The QF circuit breaker 3 is clamped in the circuit breaker mounting bracket 12. The housing base 1 is connected to a transformer bank 4 through the transformer fixing holes 14, as Figure 5 shown. The transformer bank 4 is provided with four L-shaped fixing feet 41. Transformer installation holes 42 are opened on the L-shaped fixing feet 41. The transformer bank 4 is threadedly connected to the housing base 1 through the fixing bolts passing through the transformer installation holes 42 and the transformer fixing holes 14 in sequence. The top of the housing base 1 is connected to an upper cover 5. The upper cover 5 is in snap-fit connection with the housing base 1.

[0032] Further, the mounting base 21 and the circuit board 2 are of an integrally formed structure, and the L-shaped fixing feet 41 and the transformer bank 4 are of an integrally formed structure, making the structure more stable. A wiring base 43 is connected to the transformer bank 4, and a number of uniformly spaced and linearly arranged terminal posts 44 are connected to the wiring base 43, facilitating wiring.

[0033] Specifically, the transformer bank 4 includes a transformer T1 45 and a transformer T2 46, and 9 groups of circuit relays J1 - J9 are arranged on the circuit board 2.

[0034] It should be noted that, as Figure 7 shown, a number of uniformly spaced and linearly arranged upper cover heat dissipation holes 54 are provided on the side of the upper cover 5, and a groove 51 is provided on the top surface of the upper cover 5. A display screen fixing base 52 is arranged in the groove 51, and a display screen 6 is installed in the display screen fixing base 52. Display screen fixing holes 53 are provided at the four top corners of the display screen fixing base 52. As Figure 6 shown, the display screen 6 is connected with a display screen mounting base 61. Display screen mounting holes 62 corresponding to the positions of the display screen fixing holes 53 and having matching dimensions are provided at the four top corners of the display screen mounting base 61. The display screen mounting base 61 and the display screen 6 are of an integrally formed structure. The display screen 6 is threadedly connected to the upper cover 5 through fixing bolts successively passing through the display screen mounting holes 62 and the display screen fixing holes 53. The display screen 6 has the advantage of digitally displaying electrical parameters.

[0035] In this embodiment, the voltage regulator using zero-crossing transfer of the power relay connects the circuit board 2, the QF circuit breaker 3, and the transformer bank 4 to the housing base 1 through fixing bolts in a threaded manner, facilitating installation, maintenance, and replacement, saving costs, and making the structure more stable. All parts are placed in the housing base 1 and protected by the upper cover 5 to achieve a dust-proof effect and extend the service life of the internal parts. At the same time, the base heat dissipation holes 13 provided on the side wall of the housing base 1 and the upper cover heat dissipation holes 54 provided on the side wall of the upper cover 5 improve the heat dissipation efficiency of the internal electronic parts during operation, prevent the internal parts from being burned due to excessive temperature, and reduce the maintenance cost.

[0036] On the other hand, the present invention also provides a connection circuit for the voltage regulator using zero-crossing transfer of the power relay, as Figure 8As shown in the figure, it includes transformer T145, transformer T246, QF circuit breaker 3, and power relays J1 to J8. The input end of transformer T246 is connected to the power supply side UA through the secondary winding of transformer T145 and QF circuit breaker 3. The four secondary windings of transformer T246 respectively form two sets of step-up and step-down windings, which form four groups through power relays J1 to J8 and are combined and connected to the primary winding of transformer T145. The control ends of the power relays are connected to the single-chip microcomputer control circuit system. The zero-crossing opening and closing of the power relays are controlled by the output instructions in the single-chip microcomputer. Under the program control set by the single-chip microcomputer, the power relays close when the voltage passes through zero and open when the current passes through zero, so that there is no arc generated between the contacts during the switching of the power relays, ensuring that the contacts of the power relays will not be burned and adhered due to arc sparks, thereby prolonging the service life of the power relays. The power relays have a large passing current, low cost, and do not need to continuously supply power to the driving coil after closing, reducing the power of the control circuit power supply and achieving the purpose of saving electric energy.

[0037] Furthermore, the primary winding of transformer T246 and QF circuit breaker 3 are connected through the secondary winding of transformer T145. The four secondary windings of transformer T246 can form step-up combinations, step-down combinations, step-up and step-down combination modes.

[0038] Specifically, power relays J1 to J8 form four groups and are respectively connected to the secondary windings of transformer T246. The contacts of power relays J1 to J4 are respectively connected to the two 28V windings on the secondary side of transformer T2 to form the first set of step-up and step-down combinations; the contacts of power relays J5 to J8 are respectively connected to the two 7V windings on the secondary side of transformer T2 to form the second set of step-up and step-down combinations. The step-up and step-down amplitude of the first set of step-up and step-down combination windings is ±28V; the step-up and step-down amplitude of the second set of step-up and step-down combination windings is ±7V. The first step-up and step-down winding and the second step-up and step-down winding are both composed of two separate windings. Two contacts are provided under each of the two separate windings, and each contact corresponds to a power relay. Among them, the step-up and step-down amplitude of the two separate windings of the first step-up and step-down winding is ±28V, and the step-up and step-down amplitude of the two separate windings of the second step-up and step-down winding is ±7V. They can be combined into voltage values with a span of 7V between -35 and +70, and can realize the voltage range of the input voltage of 150 - 255V stably output as 220V ± 3V. 8 single-pole power relays can be used, or double-pole power relays can also be used. When fully disconnected, it is in a current cut-off state, which can play a role in protecting the output, saving a protection relay, and reducing the cost and control difficulty.

[0039] Embodiment 2

[0040] As the second embodiment of the present invention, as Figure 9 shown, in the embodiment of the present invention, the voltage regulator is a single-phase power relay transfer control compensation type voltage regulator.

[0041] Its principle control method is the same as that of Embodiment 1. The difference feature compared with the above Embodiment 1 is that the transformer T2 and the QF circuit breaker are connected through a compensation transformer T1. Compared with the technical solution of Embodiment 1, adding the compensation transformer T1 has advantages such as current non-break power supply. This invention design is mainly applied to medium and high power single-phase and three-phase voltage stabilizers.

[0042] Generally speaking, the voltage stabilizers of Embodiment 1 and Embodiment 2 have the characteristics of small volume, low cost, fast response time and strong load applicability, and also have advantages such as single-chip microcomputer programming control and digital display of electrical parameters.

[0043] It should be noted that the electrical components, electronic components and power modules involved in the present invention are only conventional adaptive applications of the prior art. Therefore, the improvement of the present invention over the prior art lies in the connection relationship between the hardware, rather than the electrical components, electronic components and power modules themselves. That is, although the present invention involves some electrical components, electronic components and power modules, it does not include improvements to the electrical components, electronic components and power modules themselves. The description of the electrical components, electronic components and power modules in the present invention is to better illustrate the present invention for better understanding of the present invention.

[0044] The working principle of the voltage stabilizer using zero-crossing transfer of power relays and its connection circuit of the present invention: The step-up and step-down windings are transferred through a total of eight power relays J1-J8. Through the vector compensation principle, the purpose of boosting the circuit by 7 - 70V and stepping down by 7 - 35V can be achieved. The single-chip microcomputer control circuit system controls different combination states of the 8 power relays to achieve the purpose of stabilizing the output voltage at 220V with an accuracy of ±3V. Under the control of the single-chip microcomputer control circuit system, the power relays close when the voltage crosses zero and separate when the current crosses zero, so that there is no arc generated between the contacts during the switching of the power relays, ensuring that the contacts of the power relays will not be burned and adhered due to arc sparks, thereby extending the service life of the power relays. The power relays have a large current-carrying capacity, low cost, and do not need to continuously supply power to the drive coil after closing, reducing the power of the control circuit power supply and achieving the purpose of energy saving. The single-chip microcomputer control circuit system controls 8 power relays and the first step-up and step-down winding and the second step-up and step-down winding to achieve 16 combination modes, which can subtract 35V voltage vectorially and add 70V voltage vectorially to the main circuit. The minimum span voltage value is 7V, and the input voltage range of 150 - 255V can be achieved, and the output voltage after voltage stabilization is in the accuracy range of 220V ± 3V.

[0045] It should be particularly noted that the transformer, QF circuit breaker 3 and power relay in the present invention are applications of existing technologies. The step-up and step-down windings can achieve the purpose of boosting the circuit voltage by 10 - 70V and reducing the voltage by 10 - 35V through the switching of 8 power relays. The microcontroller sets the program to control the power relay to close when the voltage passes through zero and open when the current passes through zero. It has the characteristics of small volume, low cost, fast response time and strong load adaptability, and also has advantages such as digital display of electrical parameters. The zero-crossing switching and strong load adaptability are the innovation points of the present invention, which effectively solve the above-mentioned deficiencies of existing voltage regulators and other problems.

[0046] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A voltage regulator that uses a power relay for zero-crossing transfer, characterized in that: It includes a housing base (1). On one side inner wall of the housing base (1), a terminal block (11) is installed. On one side wall of the housing base (1), a circuit breaker mounting bracket (12) is provided. On the side wall of the housing base (1), base heat dissipation holes (13) are opened. On the bottom surface of the housing base (1), transformer fixing holes (14) and circuit board fixing holes (15) are opened; the housing base (1) is connected to a circuit board (2) through the circuit board fixing holes (15). At the bottom of the circuit board (2), a mounting seat (21) is provided. At the four top corners of the mounting seat (21), mounting holes (22) are opened. The circuit board (2) is threadedly connected to the housing base (1) through fixing bolts sequentially passing through the mounting holes (22) and the circuit board fixing holes (15); a QF circuit breaker (3) is installed in the circuit breaker mounting bracket (12). The QF circuit breaker (3) is clamped in the circuit breaker mounting bracket (12). The housing base (1) is connected to a transformer bank (4) through the transformer fixing holes (14). The transformer bank (4) is provided with four L-shaped fixing feet (41). On the L-shaped fixing feet (41), transformer mounting holes (42) are opened. The transformer bank (4) is threadedly connected to the housing base (1) through fixing bolts sequentially passing through the transformer mounting holes (42) and the transformer fixing holes (14). At the top of the housing base (1), an upper cover (5) is connected. The upper cover (5) is in snap-fit with the housing base (1); it further includes a connection circuit, and the connection circuit includes a transformer T1 (45), a transformer T2 (46), a QF circuit breaker (3), and power relays J1 to J8. The input end of the transformer T2 (46) is connected to the power supply side UA through the secondary winding of the transformer T1 (45) and the QF circuit breaker (3). The four secondary windings of the transformer T2 (46) respectively form two sets of step-up and step-down windings, and form four groups through the power relays J1 to J8, and are combined and connected to the primary winding of the transformer T1 (45). The control ends of the power relays are connected to the single-chip microcomputer control circuit system; between the primary winding of the transformer T2 (46) and the QF circuit breaker (3), they are connected through the secondary winding of the transformer T1 (45). The four secondary windings of the transformer T2 (46) form step-up combinations, step-down combinations, step-up and step-down combination modes. The power relays J1 to J8 form four groups and are respectively connected to the secondary windings of the transformer T2 (46). The contacts of the power relays J1 to J4 are respectively connected to the two 28V windings of the secondary side of the transformer T2, forming the first set of step-up and step-down combinations; the contacts of the power relays J5 to J8 are respectively connected to the two 7V windings of the secondary side of the transformer T2, forming the second set of step-up and step-down combinations. The step-up and step-down amplitude of the first set of step-up and step-down combination windings is ±28V; the step-up and step-down amplitude of the second set of step-up and step-down combination windings is ±7V.

2. The voltage regulator using zero-crossing transfer of the power relay according to claim 1, characterized in that: The mounting base (21) and the circuit board (2) are of an integrally formed structure. The L-shaped fixing feet (41) and the transformer bank (4) are of an integrally formed structure. A terminal block (43) is connected to the transformer bank (4), and a number of uniformly spaced and linearly arranged terminal posts (44) are connected to the terminal block (43).

3. The voltage stabilizer using zero-crossing transfer of the power relay according to claim 1, characterized in that: The transformer bank (4) includes a transformer T1 (45) and a transformer T2 (46), and 9 groups of circuit relays J1-J9 are arranged on the circuit board (2).

4. The voltage regulator using zero-crossing transfer of a power relay according to claim 1, characterized in that: A number of uniformly spaced and linearly arranged upper cover heat dissipation holes (54) are formed in the side of the upper cover (5). A groove (51) is formed in the top surface of the upper cover (5), and a display fixing base (52) is arranged in the groove (51). A display screen (6) is installed in the display fixing base (52).

5. The voltage stabilizer using zero-crossing transfer of the power relay according to claim 4, characterized in that: Display fixing holes (53) are formed at the four corners of the display fixing base (52). The display screen (6) is connected with a display mounting base (61), and display mounting holes (62) corresponding to the positions of the display fixing holes (53) and having matching dimensions are formed at the four corners of the display mounting base (61).

6. The voltage regulator using zero-crossing transfer of the power relay according to claim 5, characterized in that: The display mounting base (61) and the display screen (6) are of an integrally formed structure. The display screen (6) is threadedly connected to the upper cover (5) through fixing bolts sequentially passing through the display mounting holes (62) and the display fixing holes (53).

7. The voltage regulator connection circuit using zero-crossing transfer of a power relay according to claim 1, characterized in that: The zero-crossing opening and closing of the power relay are both controlled by output instructions in the single-chip microcomputer.

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