A power distribution voltage reduction and energy-saving device and its control method

Abstract

The present invention provides a power distribution voltage reduction and power saving device and a control method, wherein the control method comprises: after providing a load to the primary coil of the step-down transformer in the power distribution voltage reduction and power saving device, switching the power distribution mode of the power distribution voltage reduction and power saving device, and when the connection time of the load reaches a preset time, cutting off the load; when switching back and forth to the power distribution mode, the power distribution voltage reduction and power saving device collects the voltage and current values ​​of each sampling time period; and calculates the corresponding active power and / or active electricity indication in each power distribution mode, and then calculates the total power saving and the total power saving rate. The beneficial effects of the present invention: avoiding the extremely high voltage generated by the instantaneous open circuit of the primary coil of the step-down transformer of the power distribution voltage reduction and power saving device when switching the power distribution mode, thereby protecting the power distribution voltage reduction and power saving device, collecting the voltage and current values ​​of each sampling time period in real time and calculating the active power and / or active electricity indication in different power distribution modes, thereby realizing the real-time calculation of the total power saving and the total power saving rate.

Description

Technical Field

[0001] The present invention relates to the field of circuit technology, and in particular to a power distribution voltage reduction and power saving device and a control method. Background Art

[0002] As the country completes the transformation of urban and rural power grids to improve the low terminal voltage of the original urban and rural power grids, the voltage of urban and rural power grids is generally high;

[0003] The State Grid's low-voltage distribution network sets the voltage between power supply lines to 400V based on line loss factors, while the rated voltage of users' electrical equipment is 380V / 220V, thereby increasing the single-phase voltage of the above-mentioned electrical equipment. In particular, the single-phase voltage of electrical equipment at night can reach 240V-250V, which in turn causes the electrical equipment to generate additional power and heat during operation, further reducing the service life of the electrical equipment.

[0004] Therefore, how to reduce the extra voltage has become a problem that needs to be solved urgently, wherein the extra voltage is a voltage higher than the rated voltage.

[0005] The prior art generally adopts the technical solution of auto-coupling buck regulation, and the technical solution of auto-coupling buck regulation in the prior art includes the following methods:

[0006] The first is fixed control mode;

[0007] Advantages: simple circuit, low cost, high reliability, no mechanical noise of gear shifting, low power consumption of the machine;

[0008] Disadvantages: It can only reduce the voltage at a fixed level, the voltage cannot be adjusted according to the change of the output voltage, and the power saving rate and power saving cannot be calculated in real time.

[0009] The second type is the thyristor automatic shift control method;

[0010] Advantages: No mechanical noise from gear shifting, voltage can be adjusted according to the change of output voltage;

[0011] Disadvantages: complex circuit, high cost, high power consumption, and inability to calculate power saving rate and power saving in real time.

[0012] The third type is the contactor automatic shift control method;

[0013] Advantages: The voltage can be adjusted according to the change of output voltage;

[0014] Disadvantages: There is mechanical noise when the contactor shifts gears, and there will be a momentary open circuit on the primary side of the autotransformer to generate high voltage when shifting gears. The reliability and safety are poor, frequent switching is not allowed, the cost is slightly high, the power consumption of this machine is medium, and the power saving rate and power saving cannot be calculated in real time.

[0015] Fourth, transformer primary sliding contact control method;

[0016] Advantages: No mechanical noise from gear shifting, voltage can be adjusted according to the change of output voltage;

[0017] Disadvantages: high cost, need for regular power outages to replace contacts and remove deposits, and inability to calculate power saving rate and amount of power saved in real time.

[0018] It can be seen that the common defect of the above four technical solutions is that the power saving rate and the amount of power saved cannot be calculated in real time. The core indicator of the power distribution and power saving device is the power saving rate. In order to obtain this indicator of the device, it is generally necessary to conduct a comparative test under constant load conditions on site, or to conduct a comparative test under laboratory conditions. In the past, users who have installed the device need to see the power saving effect intuitively. They often need to know the power saving rate or the amount of power saved through comparative calculations when settling the monthly electricity bill. They cannot see the power saving rate of the device in real time; nor can they know how many kilowatt-hours of electricity have been saved in any period of time. When the user's electricity consumption changes greatly, it is even more difficult to see the power saving effect, and thus question the power saving device. Summary of the invention

[0019] In view of the above problems existing in the prior art, a control method for a power distribution voltage reduction and power saving device is now provided.

[0020] The specific technical solutions are as follows:

[0021] A control method for a power distribution voltage reduction and power saving device, wherein the control method is applied to the power distribution voltage reduction and power saving device; the control method comprises the following steps:

[0022] After providing a load to the primary coil of the step-down transformer in the power distribution step-down power saving device, the power distribution mode of the power distribution step-down power saving device is switched, and when the load connection time reaches the preset time, the load is cut off; each power distribution mode is switched back and forth, and when switching to the corresponding power distribution mode, the voltage and current values ​​are collected in the sampling time period and the corresponding active power and / or active electricity indication is calculated; the start time and interval time are set, and the power distribution mode is switched back and forth according to the start time and interval time;

[0023] When switching to the power distribution mode, the power distribution voltage reduction and power saving device calculates the active power and / or active energy indication according to the voltage and current values ​​in each sampling time period;

[0024] The total power saving and the total power saving rate are calculated according to the active power and / or active energy indication in each sampling time period under each power distribution mode.

[0025] Preferably, a control method for a power distribution voltage reduction and power saving device, wherein the power distribution mode of the power distribution voltage reduction and power saving device is switched after a load is provided to the primary coil of a step-down transformer in the power distribution voltage reduction and power saving device, and when the load connection time reaches a preset time, the load is cut off, comprising:

[0026] Connecting a load circuit so that the load circuit provides a load to the primary coil of the step-down transformer, and recording the connection time of the load circuit;

[0027] Switching a power distribution mode of the step-down transformer so that the step-down transformer converts an input voltage into an output voltage corresponding to the power distribution mode;

[0028] When the on time reaches the preset time, the load circuit is cut off.

[0029] Preferably, in the control method of the power distribution voltage reduction and power saving device, the power distribution mode includes a power saving mode and a mains power mode.

[0030] Preferably, a control method for a power distribution voltage reduction and power saving device, wherein active power and / or active electric degree indication is calculated according to the voltage and current values ​​in each sampling time period under each power distribution mode, and then the total power saving and total power saving rate are calculated, comprises the following steps:

[0031] The active power in each sampling period when switching to the mains mode and the power-saving mode is calculated, and the active power in the mains mode is set as the mains active power, the active power in the power-saving mode is set as the power-saving active power, and the active energy indication in the power-saving mode is set as the power-saving active energy indication;

[0032] Calculate the power saving active energy in the power saving mode according to the starting power saving active energy indication value and the ending power saving active energy indication value of each sampling time period;

[0033] Calculate the real-time power saving rate according to the mains active power and power saving active power in each sampling period;

[0034] Calculate the mains active energy in mains mode according to the real-time power saving rate and power saving active energy in each sampling period;

[0035] Calculate the total energy saving according to the mains active energy and energy saving active energy corresponding to each sampling period;

[0036] The total power saving rate is calculated based on the mains active energy and real-time power saving rate in each sampling period.

[0037] Preferably, the control method of the power distribution voltage reduction and power saving device, wherein the active power switched to the mains mode and the power saving mode in each sampling time period is calculated, comprises the following steps:

[0038] The mains active power is calculated based on the voltage and current collected during the current sampling period in the mains mode;

[0039] Switch to the power saving mode, and calculate the power saving active power and power saving active energy indication according to the voltage and current collected in the current sampling period in the power saving mode;

[0040] The next sampling period is set as the current sampling period, and the process returns to step S311 until the commercial power active power, power-saving active power and power-saving active energy indication values ​​of each sampling period are calculated.

[0041] Also included is a power distribution voltage reduction and power saving device, which includes:

[0042] An input terminal, used for providing an input voltage;

[0043] An output terminal, used for inputting an output voltage;

[0044] The step-down circuit is connected between the input terminal and the output terminal, and is used to switch the power distribution mode of the power distribution step-down power saving device back and forth, so that the input voltage is converted into an output voltage corresponding to the power distribution mode; the power saving mode in the power distribution mode is set with multiple gears to obtain several different output voltages;

[0045] The automatic controller is connected between the input end and the output end and is connected to the step-down circuit, and is used to control the step-down circuit to switch the power distribution mode back and forth, and obtain the active power and / or active electricity indication of each sampling time period in the corresponding power distribution mode, and calculate the total power saving rate and the total power saving according to the active power and / or active electricity indication of each sampling time period.

[0046] Preferably, the power distribution voltage reduction and power saving device, wherein the voltage reduction circuit comprises:

[0047] A step-down transformer, the step-down transformer is connected between the input terminal and the output terminal, and the step-down transformer is used to convert the input voltage into an output voltage corresponding to the power distribution mode;

[0048] A switch circuit is connected between the input terminal and the power line, and the switch circuit is connected to the step-down transformer, and the switch circuit is used to switch the power distribution mode of the step-down transformer so that the step-down transformer switches the input voltage to an output voltage corresponding to the power distribution mode;

[0049] The load circuit is connected between the switch circuit and the power line, and is connected to the step-down transformer to provide a load to the primary coil of the step-down transformer before the switch circuit switches the power distribution mode of the step-down transformer.

[0050] Preferably, in the power distribution voltage reduction and power saving device, the load circuit comprises a first switch and a load element, one end of the first switch is connected to the first end of the step-down transformer, and the other end of the first switch is connected to the power line through the load element.

[0051] Preferably, the power distribution voltage reduction and power saving device, wherein the switch circuit comprises:

[0052] a second switch, one end of the second switch being connected to the first end of the step-down transformer, and the other end of the second switch being connected to the input end;

[0053] a third switch, one end of the third switch being connected to the first end of the step-down transformer, and the other end of the third switch being connected to the power line;

[0054] a fourth switch, one end of the fourth switch being connected to the second end of the step-down transformer, and the other end of the fourth switch being connected to the input end;

[0055] a fifth switch, one end of the fifth switch being connected to the third end of the step-down transformer, and the other end of the fifth switch being connected to the input end;

[0056] The first end and the fourth end are arranged at two ends of the primary coil of the step-down transformer;

[0057] The second end and the third end are sequentially arranged between the first end and the fourth end.

[0058] Preferably, the power distribution voltage reduction and electricity saving device further includes a switch driving circuit, which is respectively connected to the automatic controller and the voltage reduction circuit, so that the automatic controller controls the voltage reduction circuit by controlling the switch driving circuit.

[0059] The above technical solution has the following advantages or beneficial effects:

[0060] By providing a load to the step-down transformer of the power distribution step-down power saving device before switching the power distribution mode of the power distribution step-down power saving device, the extremely high voltage generated by the instantaneous primary open circuit of the power distribution step-down power saving device when switching the power distribution mode is avoided, thereby protecting the power distribution step-down power saving device;

[0061] By cutting off the load within a preset time range, the power consumption of the load is reduced, thereby reducing the use cost of the load and improving the safety of the power distribution mode of the switching power distribution voltage reduction and power saving device;

[0062] By switching back and forth between each power distribution mode, and collecting voltage and current values ​​in a sampling period when switching to the corresponding power distribution mode, the active power and / or active energy indication of the sampling period is obtained, thereby achieving the active power and / or active energy indication in each sampling period under different power distribution modes at nearly the same time;

[0063] The active power and / or active energy indications are calculated based on the real-time collection of the voltage and current values ​​of each distribution mode in each sampling time period, and thus the total power saving and total power saving rate can be calculated in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] The embodiments of the present invention will be described more fully with reference to the attached drawings, which are provided for illustration and description only and are not intended to limit the scope of the present invention.

[0065] Figure 1 It is a principle block diagram of an embodiment of a power distribution voltage reduction and power saving device of the present invention;

[0066] Figure 2 It is a principle block diagram of a voltage reduction circuit of an embodiment of a power distribution voltage reduction and power saving device of the present invention;

[0067] Figure 3 This is a diagram of collected data for an embodiment of the power distribution voltage reduction and power saving device of the present invention. DETAILED DESCRIPTION

[0068] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0069] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0070] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0071] The present invention includes that it should be noted that in other embodiments, the steps of the corresponding method are not necessarily performed in the order shown and described in this specification. In some other embodiments, the steps included in the method may be more or less than those described in this specification. In addition, a single step described in this specification may be decomposed into multiple steps for description in other embodiments; and multiple steps described in this specification may be combined into a single step for description in other embodiments.

[0072] A control method for a power distribution voltage reduction and power saving device is applied to a power distribution voltage reduction and power saving device, such as Figure 1 As shown; the control method comprises the following steps:

[0073] Step S1, after providing a load to the primary coil of the step-down transformer in the power distribution step-down power saving device, switching the power distribution mode of the power distribution step-down power saving device, and when the load connection time reaches a preset time, cutting off the load;

[0074] Step S2, when switching to the power distribution mode, the power distribution voltage reduction and power saving device calculates the active power and / or active energy indication according to the voltage and current values ​​in each sampling time period;

[0075] Step S3, calculating the total power saving and the total power saving rate according to the active power and / or active energy indication in each sampling time period under each power distribution mode.

[0076] In the above embodiment, it should be noted that the execution order of step S1, step S2 and step S3 may not be sequential;

[0077] This embodiment provides a load to the primary coil of the step-down transformer of the power distribution step-down power saving device before switching the power distribution mode of the power distribution step-down power saving device, thereby avoiding the extremely high voltage generated by the instantaneous primary open circuit of the power distribution step-down power saving device when switching the power distribution mode, thereby protecting the power distribution step-down power saving device;

[0078] This embodiment reduces the power consumption of the load by cutting off the load within a preset time range, thereby reducing the use cost of the load and improving the safety of the power distribution mode of the switching power distribution voltage reduction and power saving device;

[0079] This embodiment switches back and forth between each power distribution mode, and collects voltage and current values ​​within a sampling period when switching to the corresponding power distribution mode, so as to obtain the active power and / or active energy indication of the sampling period, thereby realizing the calculation of the active power and / or active energy indication of each sampling period under different power distribution modes at nearly the same time;

[0080] This embodiment can collect the voltage and current values ​​in each sampling time period in each power distribution mode in real time and calculate the corresponding active power and / or active energy indication, so this embodiment can realize real-time calculation of total power saving and total power saving rate.

[0081] Furthermore, in the above embodiment, step S1 includes the following steps:

[0082] Step S11, connecting a load circuit so that the load circuit provides a load to the primary coil of the step-down transformer, and recording the connection time of the load circuit;

[0083] Step S12, switching the power distribution mode of the step-down transformer so that the step-down transformer converts the input voltage into an output voltage corresponding to the power distribution mode;

[0084] Step S13, when the on time reaches a preset time, the load circuit is cut off.

[0085] In the above embodiment, step S11, step S12 and step S13 are executed sequentially; this embodiment connects the load circuit before switching the power distribution mode of the step-down transformer T, thereby achieving safe and fast switching between different power distribution modes.

[0086] As a preferred embodiment, the power distribution voltage reduction and power saving device needs to collect the voltage and current values ​​of each sampling time period within a preset time and calculate the corresponding active power and / or active electricity indication;

[0087] First, the current power distribution mode of the step-down transformer T is the first power distribution mode. At this time, the power distribution step-down power saving device has collected the voltage and current values ​​of the current sampling time period under the first power distribution mode and calculated the corresponding active power and / or active electricity indication. At this time, the step-down transformer T needs to be switched to the second power distribution mode;

[0088] Next, before the step-down transformer T switches to the second power distribution mode, the load circuit may be turned on so that the load circuit provides a load to the step-down transformer T, and the turn-on time of the load circuit is recorded;

[0089] Subsequently, the step-down transformer T switches the first power distribution mode to the second power distribution mode, and the power distribution step-down and power saving device collects the voltage and current values ​​of the current sampling time period under the second power distribution mode and calculates the corresponding active power and / or active electricity indication;

[0090] Then, it is determined whether the connection time of the calculated load circuit is within a preset time range;

[0091] If so, cut off the load circuit;

[0092] If not, determining whether the on-time of the load circuit exceeds a maximum value of a preset time range;

[0093] and cut off the load circuit when the on time of the load circuit exceeds the maximum value of the preset time range;

[0094] And when the on-time of the load circuit does not exceed the maximum value of the preset time range, the load circuit continues to be connected until the on-time of the load circuit reaches the preset time, and then the load circuit is disconnected.

[0095] Next, the next sampling time period is taken as the current sampling time period, and the above steps are repeated until the active power and / or active energy indications in the first power distribution mode and the second power distribution mode in each sampling time period within the preset time are calculated.

[0096] Furthermore, in the above embodiment, the power distribution mode includes a power saving mode and a mains power mode.

[0097] In the above embodiment, it should be noted that when the rated input voltage is provided to the primary coil of the step-down transformer T, the secondary coil wound through the opposite same-name terminals will output a voltage value with a phase opposite to the input voltage; when the number of turns of the secondary coil remains unchanged, the magnitude of its output voltage value is related to the number of turns of the primary coil;

[0098] Among them, the power saving mode may include multiple gears. In this embodiment, when several different output voltages are required, it is necessary to provide input taps corresponding to several gears to adjust the output voltage. Therefore, the power saving mode in the power distribution mode is set with multiple gears. The number of gears in the power saving mode can be increased or decreased according to demand. For example, the output terminal OUT corresponding to the power saving mode gear can include the first gear, the second gear and the third gear arranged from small to large, and the voltage values ​​of the first gear, the second gear and the third gear can be customized. Here, the first gear can be set to 10V, the second gear can be set to 20V, and the third gear can be set to 30V.

[0099] It should be noted that when the primary coil of the step-down transformer T is short-circuited, the output voltage is zero, that is, the output coil is also in a short-circuit state. That is, the voltage will not be reduced. However, when the primary coil is short-circuited, the AC rated voltage cannot be applied to prevent the external AC power supply from short-circuiting. Therefore, the output terminal OUT corresponding to the gear position of the AC power mode is set to 0V.

[0100] Furthermore, in the above embodiment, step S3 includes the following steps:

[0101] Step S31, calculate the active power in each sampling time period when switching to the mains mode and the power saving mode, and set the active power in the mains mode as the mains active power, set the active power in the power saving mode as the power saving active power, and set the active energy indication in the power saving mode as the power saving active energy indication;

[0102] like Figure 3 As shown, when it is necessary to obtain the total power saving and total power saving rate in a specific time period, the specific time period can be divided into n sampling time periods, and the power distribution mode can be switched back and forth to obtain the mains active power, power saving active power and power saving active energy indication values ​​in the sampling time period;

[0103] Step S32, calculating the power saving active energy in the power saving mode according to the starting power saving active energy indication value and the ending power saving active energy indication value of each sampling time period, as shown in the following formula;

[0104] W bn-1 ={D bn -D bn-1};

[0105] Among them, D b Used to indicate the active power of power saving;

[0106] n is used to indicate the sequence number of the sampling time period;

[0107] That is, in this embodiment, the energy-saving active energy of the sampling period in the energy-saving mode can be calculated by the difference between the energy-saving active energy indication at the end of each sampling period and the energy-saving active energy indication at the start, such as Figure 3 As shown, for example, when the power-saving active energy of the collection time period from the 1st sequence number to the 2nd sequence number is to be obtained, it is necessary to obtain the power-saving active energy indications of the collection time points of the 1st sequence number and the 2nd sequence number, and use the difference between the two as the power-saving active energy of the collection time period of the 1st sequence number;

[0108] Step S33, calculating the real-time power saving rate according to the mains active power and the power saving active power in each sampling time period, as shown in the following formula;

[0109] ε n =(P an -P bn ) / P n ;

[0110] Among them, P a Used to indicate the active power of the mains;

[0111] P b Used to indicate the active power of power saving;

[0112] P is used to represent active power;

[0113] ε is used to represent the real-time power saving rate;

[0114] n is the sampling time period number;

[0115] Step S34, calculating the mains active energy in the mains mode according to the real-time power saving rate and the power saving active energy in each sampling time period, as shown in the following formula:

[0116] W an-1 =W bn-1 / (1-ε n-1 );

[0117] Among them, W b Used to indicate the active energy of power saving;

[0118] ε is used to represent the real-time power saving rate;

[0119] W a Used to indicate the active energy of the mains;

[0120] Step S35, calculating the total energy saving amount according to the mains active energy and energy saving active energy corresponding to each sampling time period, as shown in the following formula;

[0121] W s =ΣW an-1 -ΣW bn-1 ;

[0122] Among them, W a Used to indicate the active energy of the mains;

[0123] W b Used to indicate the active energy of power saving;

[0124] W s Used to indicate total power savings;

[0125] Step S36, calculating the total power saving rate according to the mains active energy and the real-time power saving rate in each sampling time period, as shown in the following formula;

[0126] ε s =(ε1W a1 +ε2W a2 +……+ε n-1 W an-1 ) / (W a1 +W a2 +……+W an-1 );

[0127] Among them, ε s Used to indicate the total power saving rate.

[0128] As a preferred implementation, the power distribution mode of the power distribution voltage reduction and power saving device includes the first gear, the second gear, the third gear and the mains mode in the power saving mode as an example;

[0129] The first gear in the power saving mode corresponds to an output voltage of 10V, the second gear in the power saving mode corresponds to an output voltage of 20V, and the third gear in the power saving mode corresponds to an output voltage of 30V;

[0130] Take the current power distribution mode as the first gear under the power saving mode, and the corresponding output voltage is 10V as an example. At this time, the power distribution voltage reduction power saving device collects the power saving active power and power saving active electricity indication of the current sampling time period under the first gear. At this time, if you want to know the real-time power saving rate of the current sampling time period, you must immediately switch to the mains mode to measure the mains active power value in real time, and then switch back to the first gear under the voltage reduction gear power saving mode, as follows:

[0131] Firstly, after obtaining the power-saving active power and the power-saving active energy indication value according to the voltage and current collected in the current sampling time period in the power-saving mode, the load circuit is connected;

[0132] Subsequently, the step-down transformer T switches the first gear in the power-saving mode to the mains mode, and at this time, the power distribution step-down power-saving device collects the mains active power in the current sampling time period in the mains mode;

[0133] Then, the load circuit is cut off when the on time of the load circuit reaches a preset time.

[0134] Further, in the above embodiment, step S31 includes the following steps:

[0135] Step S311, calculating the mains active power according to the voltage and current collected in the current sampling period in the mains mode;

[0136] Step S312, switching to the power saving mode, and calculating the power saving active power and the power saving active energy indication according to the voltage and current collected in the current sampling period in the power saving mode;

[0137] Step S313, setting the next sampling time period as the current sampling time period, and returning to step S311, until the commercial power active power, power-saving active power and power-saving active energy indication values ​​of each sampling time period are calculated.

[0138] In the above embodiment, the voltage and current values ​​within the same sampling time period are collected by switching the power distribution mode in real time and the corresponding active power and / or active electricity indication is calculated, so as to obtain the mains active power, power-saving active power and power-saving active electricity indication of each sampling time period in a nearly synchronous manner.

[0139] Furthermore, in the above embodiment, the preset time range is 1s to 2s. Thus reducing the power consumption and cost of the load circuit also includes a power distribution voltage reduction and power saving device, such as Figure 1 As shown, including:

[0140] The input terminal IN is used to provide an input voltage;

[0141] The output terminal OUT is used to input an output voltage;

[0142] The step-down circuit 1 is connected between the input terminal IN and the output terminal OUT and is used to switch the power distribution mode of the power distribution step-down power saving device so that the input voltage is converted into an output voltage corresponding to the power distribution mode;

[0143] The automatic controller 2 is connected between the input terminal IN and the output terminal OUT, and is used to control the step-down circuit 1 to switch the power distribution mode, and collect the active power and / or active electricity indication of each sampling time period in the power distribution mode, and calculate the total power saving rate and the total power saving according to the active power and / or active electricity indication of each sampling time period.

[0144] In the above embodiment, each power distribution mode is switched back and forth by the step-down circuit 1, and when switching to the corresponding power distribution mode, the voltage and current values ​​are collected for the sampling time period and the corresponding active power and / or active energy indication is calculated, so that the active power and / or active energy indication of each sampling time period under different power distribution modes is obtained at nearly the same time;

[0145] In the above embodiment, the automatic controller 2 can control the step-down circuit 1 to switch the power distribution mode, so that the automatic controller 2 collects the voltage and current values ​​of each sampling time period in each power distribution mode and calculates the corresponding active power and / or active electricity indication; and calculates the total power saving and the total power saving rate according to the active power and / or active electricity indication in each sampling time period in each power distribution mode. Since the step-down circuit 1 can collect the voltage and current values ​​of each sampling time period in each power distribution mode in real time and calculate the corresponding active power and / or active electricity indication, the automatic controller 2 can realize real-time calculation of the total power saving and the total power saving rate.

[0146] In the above embodiment, the automatic controller 2 can set the start time and interval time, and control the step-down circuit 1 to switch the power distribution mode according to the above start time and interval time, so as to obtain the active power and / or active electricity indication of the corresponding sampling time period under the corresponding power distribution mode at every interval time.

[0147] As a preferred embodiment, an in-line switch ZK1 is provided between the step-down circuit 1 and the input terminal IN, an out-line switch ZK3 is provided between the step-down circuit 1 and the output terminal OUT, and a bypass switch ZK2 is provided between the input terminal IN and the output terminal OUT;

[0148] The input end is the A-phase incoming line end, the output end is the A-phase outgoing line end, and the A-phase line can be the live line L;

[0149] The power line is the neutral line N.

[0150] It should be noted that the power distribution voltage reduction and power saving device in this embodiment takes a single-phase circuit as an example, and can be expanded to a three-phase circuit.

[0151] Furthermore, in the above embodiment, if Figure 2 As shown, the buck circuit 1 includes:

[0152] A step-down transformer T, the step-down transformer T is connected to the input terminal IN and the output terminal OUT, and the step-down transformer T is used to convert the input voltage into an output voltage corresponding to the power distribution mode;

[0153] A switch circuit, the switch circuit is connected between the input terminal IN and the power line, and the switch circuit is connected to the step-down transformer T, and the switch circuit is used to switch the power distribution mode of the step-down transformer T, so that the step-down transformer T switches the input voltage to an output voltage corresponding to the power distribution mode;

[0154] The load circuit is connected between the switch circuit and the power line, and the load circuit is connected to the step-down transformer, and is used to provide a load to the primary coil of the step-down transformer T before the switch circuit switches the power distribution mode of the step-down transformer T.

[0155] This embodiment provides a load to the step-down transformer T before the step-down transformer T switches the power distribution mode, thereby preventing the extremely high voltage generated by the instantaneous primary open circuit of the step-down transformer T when switching the power distribution mode, thereby protecting the power distribution voltage reduction and energy saving device;

[0156] This embodiment achieves safe and rapid switching between different power distribution modes by connecting the load circuit before the step-down transformer T switches the power distribution mode.

[0157] As a preferred embodiment, the power distribution voltage reduction and power saving device needs to collect the voltage and current values ​​of each sampling time period within a preset time and calculate the corresponding active power and / or active electricity indication;

[0158] First, the current power distribution mode of the step-down transformer T is the first power distribution mode. At this time, the power distribution step-down power saving device has collected the active power and / or active energy indication of the current sampling time period under the first power distribution mode. At this time, the step-down transformer T needs to be switched to the second power distribution mode;

[0159] Next, before the step-down transformer T switches to the second power distribution mode, the load circuit can be directly connected so that the load circuit provides a load to the step-down transformer T, and the connection time of the load circuit is recorded;

[0160] Subsequently, the step-down transformer T switches the first power distribution mode to the second power distribution mode, and the power distribution step-down and power saving device collects the active power and / or active energy indication of the current sampling time period under the second power distribution mode;

[0161] Then, it is determined whether the connection time of the calculated load circuit is within a preset time range;

[0162] If so, cut off the load circuit;

[0163] If not, determining whether the on-time of the load circuit exceeds a maximum value of a preset time range;

[0164] and cut off the load circuit when the on time of the load circuit exceeds the maximum value of the preset time range;

[0165] And when the on time of the load circuit does not exceed the maximum value of the preset time range, the load circuit continues to be connected until the on time of the load circuit is within the preset time range and the load circuit is cut off.

[0166] Next, the next sampling time period is taken as the current sampling time period, and the above steps are repeated until the active power and / or active energy indications in the first power distribution mode and the second power distribution mode in each sampling time period within the preset time are measured.

[0167] Furthermore, in the above embodiment, the load circuit includes a first switch K1 and a load element L, one end of the first switch K1 is connected to the first end 11 of the step-down transformer T, and the other end of the first switch K1 is connected to the power line through the load element L.

[0168] As a preferred implementation, the load circuit may be a reactor; the load circuit in this embodiment is not a resistor because the resistor has high active power, high heat generation and high temperature, which will increase the power consumption and cost of the load.

[0169] When it is necessary to use the automatic controller 2 to control the step-down transformer T to switch the distribution mode, it is necessary to put the reactor into use in advance to provide an inductive load for the primary coil of the step-down transformer T, and then switch to the corresponding distribution mode, and then cut off the reactor to prevent the extremely high voltage caused by the instantaneous primary open circuit when switching gears, thereby reducing the active power, heat generation and temperature.

[0170] Furthermore, in the above embodiment, if Figure 2 As shown, the switch circuit includes:

[0171] A second switch K2, one end of the second switch K2 is connected to the first end 11 of the step-down transformer T, and the other end of the second switch K2 is connected to the input end IN;

[0172] a third switch K3, one end of the third switch K3 is connected to the first end 11 of the step-down transformer T, and the other end of the third switch K3 is connected to the power line;

[0173] A fourth switch K4, one end of the fourth switch K4 is connected to the second end 12 of the step-down transformer T, and the other end of the fourth switch K4 is connected to the input end IN;

[0174] a fifth switch K5, one end of the fifth switch K5 is connected to the third end 13 of the step-down transformer T, and the other end of the fourth switch K4 is connected to the input end IN;

[0175] The first end 11 and the fourth end 14 are arranged at two ends of the primary coil of the step-down transformer T;

[0176] The second end 12 and the third end 13 are disposed between the first end 11 and the fourth end 14 in sequence.

[0177] Furthermore, in the above embodiment, a switch driving circuit 3 is also included, which is connected to the automatic controller 2 and the step-down circuit 1 respectively, so that the automatic controller controls the step-down circuit by controlling the switch driving circuit.

[0178] The switch drive circuit 3 may be a contactor coil drive circuit or a thyristor drive circuit, so that the automatic controller 2 controls the switch circuit in the step-down circuit 1 by controlling the switch drive circuit. Similarly, if it is a thyristor drive circuit, the switch in the corresponding switch circuit is a thyristor switch element.

[0179] Taking the power distribution mode including multiple gears in the power saving mode and the mains mode, the output terminal OUT corresponding to the power saving mode gear includes the first gear, the second gear and the third gear arranged from small to large, wherein the voltage values ​​of the first gear, the second gear and the third gear can be customized, and the first gear can be set to 10V, the second gear can be set to 20V, and the third gear can be set to 30V. For example, the on-off state of the switch of each power distribution mode is shown in Table 1 below:

[0180]

[0181] Table 1

[0182] It should be noted that: OFF in the above table 1 means disconnection, and ON means connection;

[0183] It can be seen from Table 1 above that only when the third switch K3 is turned on, the power distribution mode of the step-down transformer T is the mains mode, and the corresponding output voltage is 0V;

[0184] Only when the second switch K2 is turned on, the power distribution mode of the step-down transformer T is the first gear of the power saving mode, and the corresponding output voltage is 10V;

[0185] Only when the fourth switch K4 is turned on, the power distribution mode of the step-down transformer T is the second gear of the power saving mode, and the corresponding output voltage is 20V;

[0186] Only when the fifth switch K5 is turned on, the power distribution mode of the step-down transformer T is the third gear of the power saving mode, and the corresponding output voltage is 30V.

[0187] Further, in the above embodiment, the step-down transformer T includes a secondary coil and a primary coil;

[0188] The input end of the secondary coil is set as the fifth end 15, the fifth end 15 is connected to the input end IN, and the output end of the secondary coil is set as the sixth end 16, the sixth end 16 is connected to the output end OUT;

[0189] The input end of the primary coil is set as the first end 11, which is respectively connected to the first switch K1, the second switch K2 and the third switch K3; the output end of the primary coil is set as the fourth end 14, which is connected to the power line.

[0190] Furthermore, in the above embodiment, the power distribution mode includes a power saving mode and a mains power mode.

[0191] In the above embodiment, it should be noted that when the rated input voltage is provided to the primary coil of the step-down transformer T, the secondary coil wound through the opposite same-name terminals will output a voltage value with a phase opposite to the input voltage; when the number of turns of the secondary coil remains unchanged, the magnitude of its output voltage value is related to the number of turns of the primary coil;

[0192] Therefore, in this embodiment, when several different output voltages are required, it is necessary to provide input taps corresponding to several gears to adjust the output voltage. Therefore, the power saving mode in the power distribution mode is set with multiple gears, and the number of gears in the power saving mode can be increased or decreased according to demand. For example, the output terminal OUT corresponding to the power saving mode gear can include the first gear, the second gear and the third gear arranged from small to large, wherein the voltage values ​​of the first gear, the second gear and the third gear can be customized. Here, the first gear can be set to 10V, the second gear can be set to 20V, and the third gear can be set to 30V.

[0193] It should be noted that when the primary coil of the step-down transformer T is short-circuited, the output voltage is zero, that is, the output coil is also in a short-circuit state. That is, the voltage will not be reduced. However, when the primary coil is short-circuited, the AC rated voltage cannot be applied to prevent the external AC power supply from short-circuiting. Therefore, the output terminal OUT corresponding to the gear position of the AC power mode is set to 0V.

[0194] Take the current power distribution mode as the first gear under the power saving mode, and the corresponding output voltage is 10V as an example. At this time, the power distribution voltage reduction power saving device measures the power saving active power and power saving active electricity indication value in the current sampling time period under the first gear. At this time, if you want to know the real-time power saving rate at the current moment, you must immediately switch to the mains mode to measure the mains active power value in real time, and then switch back to the first gear under the voltage reduction gear power saving mode, as described below:

[0195] Step A1, the automatic controller 2 measures the energy-saving active power and energy-saving active electricity indication in the current sampling time period under the first gear, at which time only the second switch K2 is turned on, as shown in the following Table 2;

[0196] First switch K1 Second switch K2 The third switch K3 The fourth switch K4 Fifth switch K5 OFF ON OFF OFF OFF

[0197] Table 2

[0198] Step A2, since it is necessary to measure the mains active power of the current sampling time period in the mains mode, the load circuit is turned on, and at this time the first switch K1 is changed from off to on, that is, at this time only the second switch K2 and the first switch K1 are turned on, as shown in the following Table 3;

[0199] First switch K1 Second switch K2 The third switch K3 The fourth switch K4 Fifth switch K5 ON ON OFF OFF OFF

[0200] Table 3

[0201] Step A3, delaying the mains load time interval, changing the second switch K2 from on to off, that is, at this time only the first switch K1 is on, as shown in Table 4 below;

[0202] First switch K1 Second switch K2 The third switch K3 The fourth switch K4 Fifth switch K5 ON OFF OFF OFF OFF

[0203] Table 4

[0204] Step A4, delaying the power-saving load time interval, changing the third switch K3 from off to on, that is, at this time only the first switch K1 and the third switch K3 are turned on, as shown in Table 5 below;

[0205] First switch K1 Second switch K2 The third switch K3 The fourth switch K4 Fifth switch K5 ON OFF ON OFF OFF

[0206] Table 5

[0207] Step A5, delay the third load time interval, change the first switch K1 from on to off, that is, only the third switch K3 is on at this time, so the power distribution mode of the step-down transformer T at this time is the mains mode, and measure the mains active power in the current sampling time period, as shown in Table 6 below;

[0208] First switch K1 Second switch K2 The third switch K3 The fourth switch K4 Fifth switch K5 OFF OFF ON OFF OFF

[0209] Table 6

[0210] Step A6, it is necessary to switch back to the first gear of the power saving mode, so the first switch K1 is changed from off to on, that is, at this time only the first switch K1 and the third switch K3 are turned on, as shown in Table 7 below;

[0211] First switch K1 Second switch K2 The third switch K3 The fourth switch K4 Fifth switch K5 ON OFF ON OFF OFF

[0212] Table 7

[0213] Step A7, delaying the fourth load time interval, changing the third switch K3 from on to off, that is, at this time only the first switch K1 is on, as shown in Table 8 below;

[0214] First switch K1 Second switch K2 The third switch K3 The fourth switch K4 Fifth switch K5 ON OFF OFF OFF OFF

[0215] Table 8

[0216] Step A8, delaying the fifth load time interval, changing the second switch K2 from off to on, that is, at this time only the first switch K1 and the second switch K2 are turned on, as shown in the following Table 9;

[0217] First switch K1 Second switch K2 The third switch K3 The fourth switch K4 Fifth switch K5 ON ON OFF OFF OFF

[0218] Table 9

[0219] Step A9, delaying the sixth load time interval, changing the first switch K1 from on to off, that is, only the second switch K2 is on at this time, so the power distribution mode of the step-down transformer T at this time is the first gear of the power saving mode, as shown in Table 10 below.

[0220] First switch K1 Second switch K2 The third switch K3 The fourth switch K4 Fifth switch K5 OFF ON OFF OFF OFF

[0221] Table 10

[0222] In the above embodiment, the automatic controller 2 further includes a display for displaying the total power saving rate and total power saving obtained by the automatic controller 2. This allows the user to view the total power saving rate and total power saving within a certain time range in real time, thereby improving the user's experience.

[0223] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different. Any equivalent or simple changes made based on the structure, features and principles described in the patent concept of the present invention are included in the protection scope of the patent of the present invention. The technicians in the technical field of the present invention can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A control method for a power distribution voltage reduction and power saving device, characterized in that: Applied to a power distribution voltage reduction and power saving device; the control method comprises the following steps: After providing a load to the primary coil of the step-down transformer in the power distribution step-down power saving device, the power distribution mode of the power distribution step-down power saving device is switched, and when the connection time of the load reaches a preset time, the load is cut off; a specific time period is divided into n sampling time periods, and each power distribution mode is switched back and forth, the power distribution mode includes a power saving mode and a mains mode, and when switching to the corresponding power distribution mode, the voltage and current values ​​of the sampling time period are collected and the mains active power in the mains mode and the power saving active power and active electricity indication in the power saving mode are calculated; wherein the preset time range is 1s~2s; The total power saving and the total power saving rate are calculated according to the active power and / or the active electric power indication, and the calculation method is as follows: The power saving active energy in the power saving mode is calculated according to the starting power saving active energy indication value and the ending power saving active energy indication value of each sampling time period, as shown in the following formula; W bn-1 ={D bn -D bn-1 }; Among them, D b Used to indicate the active power of power saving; n is used to indicate the sequence number of the sampling time period; The real-time power saving rate is calculated based on the mains active power and power saving active power in each sampling period, as shown in the following formula; ε n =( P an - P bn ) / P n ; Among them, P a Used to indicate the active power of the mains; P b Used to indicate the active power of power saving; P is used to represent active power; ε is used to represent the real-time power saving rate; n is the sampling time period number; The mains active energy in mains mode is calculated based on the real-time power saving rate and power saving active energy in each sampling period, as shown in the following formula: W an-1 =W bn-1 / (1-ε n-1 ); Among them, W b Used to indicate the active energy of power saving; ε is used to represent the real-time power saving rate; W a Used to indicate the active energy of the mains; The total energy saving is calculated based on the mains active energy and energy saving active energy corresponding to each sampling period, as shown in the following formula; W s =ΣW an-1 -ΣW bn-1 ; Among them, W a Used to indicate the active energy of the mains; W b Used to indicate the active energy of power saving; W s Used to indicate total power savings; The total power saving rate is calculated based on the mains active energy and real-time power saving rate in each sampling period.

2. The control method of the power distribution voltage reduction and power saving device according to claim 1, characterized in that: The step of switching the power distribution mode of the power distribution voltage reduction and power saving device after providing a load to the primary coil of the step-down transformer in the power distribution voltage reduction and power saving device, and cutting off the load when the on time of the load reaches a preset time, comprises: Connecting a load circuit so that the load circuit provides a load to the primary coil of the step-down transformer, and recording the connection time of the load circuit; Switching the power distribution mode of the step-down transformer so that the step-down transformer converts the input voltage into an output voltage corresponding to the power distribution mode; When the on time reaches the preset time, the load circuit is cut off.

3. The control method of the power distribution voltage reduction and power saving device according to claim 1, characterized in that: The total power saving rate is calculated according to the mains active electricity and the real-time power saving rate in each sampling time period, as shown in the following formula; ε s =(ε1 IN a1 +ε2 W a2 +……+ε n-1 IN an-1 ) / (IN a1 + In a2 +……+ In an-1 ); Among them, ε s Used to indicate the total power saving rate.

4. The control method of the power distribution voltage reduction and power saving device according to claim 3, characterized in that: The calculation to obtain the active power switched to the mains mode and the active power and active energy indication in the power saving mode in each sampling time period comprises the following steps: The mains active power is calculated according to the voltage and current collected during the current sampling period in the mains mode; Switching to the power saving mode, and calculating the power saving active power and the power saving active electricity indication according to the voltage and current collected in the current sampling time period in the power saving mode; The next sampling time period is set as the current sampling time period, and the step of calculating the mains active power is returned until the mains active power, the power-saving active power and the power-saving active electrical indication of each sampling time period are calculated.

5. A power distribution voltage reduction and power saving device, characterized in that: include: An input terminal, used for providing an input voltage; An output terminal, used for inputting an output voltage; A step-down circuit, connected between the input end and the output end, for switching back and forth the power distribution mode of the power distribution voltage reduction and power saving device, so that the input voltage is converted into the output voltage corresponding to the power distribution mode; the power saving mode in the power distribution mode is provided with a plurality of gears to obtain several different output voltages; An automatic controller, connected between the input end and the output end, and connected to the step-down circuit, for controlling the step-down circuit to switch the power distribution mode back and forth, and obtaining the active power and / or active electricity indication of each sampling time period in the corresponding power distribution mode, and calculating the total power saving rate and the total power saving according to the active power and / or active electricity indication of each sampling time period; wherein the preset time range is 1s~2s; The power saving active energy in the power saving mode is calculated according to the starting power saving active energy indication value and the ending power saving active energy indication value of each sampling time period, as shown in the following formula; W bn-1 ={D bn -D bn-1 }; Among them, D b Used to indicate the active power of power saving; n is used to indicate the sequence number of the sampling time period; The real-time power saving rate is calculated based on the mains active power and power saving active power in each sampling period, as shown in the following formula; ε n =( P an - P bn ) / P n ; Among them, P a Used to indicate the active power of the mains; P b Used to indicate the active power of power saving; P is used to represent active power; ε is used to represent the real-time power saving rate; n is the sampling time period number; The mains active energy in mains mode is calculated based on the real-time power saving rate and power saving active energy in each sampling period, as shown in the following formula: W an-1 =W bn-1 / (1-ε n-1 ); Among them, W b Used to indicate the active energy of power saving; ε is used to represent the real-time power saving rate; W a Used to indicate the active energy of the mains; The total energy saving is calculated based on the mains active energy and energy saving active energy corresponding to each sampling period, as shown in the following formula; W s =ΣW an-1 -ΣW bn-1 ; Among them, W a Used to indicate the active energy of the mains; W b Used to indicate the active energy of power saving; W s Used to indicate total power savings; The total power saving rate is calculated based on the mains active energy and real-time power saving rate in each sampling period.

6. The power distribution voltage reduction and power saving device according to claim 5, characterized in that: The step-down circuit comprises: a step-down transformer, the step-down transformer being connected between the input end and the output end, the step-down transformer being used for converting an input voltage into an output voltage corresponding to the power distribution mode; a switch circuit, the switch circuit being connected between the input terminal and the power line, and the switch circuit being connected to the step-down transformer, the switch circuit being used to switch the power distribution mode of the step-down transformer so that the step-down transformer switches the input voltage to an output voltage corresponding to the power distribution mode; A load circuit is connected between the switch circuit and the power line, and the load circuit is connected to the step-down transformer, and is used to provide a load to the primary coil of the step-down transformer before the switch circuit switches the power distribution mode of the step-down transformer.

7. The power distribution voltage reduction and power saving device according to claim 6, characterized in that: The load circuit includes a first switch and a load element, one end of the first switch is connected to the first end of the step-down transformer, and the other end of the first switch is connected to the power line through the load element.

8. The power distribution voltage reduction and power saving device according to claim 7, characterized in that: The switch circuit comprises: a second switch, one end of the second switch being connected to the first end of the step-down transformer, and the other end of the second switch being connected to the input end; a third switch, one end of the third switch being connected to the first end of the step-down transformer, and the other end of the third switch being connected to the power line; a fourth switch, one end of the fourth switch being connected to the second end of the step-down transformer, and the other end of the fourth switch being connected to the input end; a fifth switch, one end of the fifth switch being connected to the third end of the step-down transformer, and the other end of the fifth switch being connected to the input end; The first end and the fourth end are arranged at two ends of the primary coil of the step-down transformer; The second end and the third end are arranged in sequence between the first end and the fourth end.

9. The power distribution voltage reduction and power saving device according to claim 6, characterized in that: It also includes a switch driving circuit, which is connected to the automatic controller and the step-down circuit respectively, so that the automatic controller controls the step-down circuit by controlling the switch driving circuit.

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