Power supply control circuit and power supply control device

Abstract

The embodiment of the utility model provides a power supply control circuit and power supply control equipment, a first output end of a rectifier module is connected with an input end of a voltage transformation module, a second output end of the rectifier module is grounded, an output end of the voltage transformation module is connected with a first end of a switch module, and a second end of the switch module is connected with a second output end of the rectifier module. The third end of the switch module is connected with a power grid end, and the fourth end of the switch module is connected with an inverter internal device. When the power grid end is electrified, the rectification module and the voltage transformation module carry out rectification and voltage reduction processing on the voltage provided by the power grid end and then control the third end and the fourth end of the switch module to be conducted, so that the power grid end can supply power to internal devices of the inverter. When the power grid end is powered off, the third end and the fourth end of the switch module are disconnected, so that the power grid end and internal devices of the inverter are disconnected, the power grid end and the inverter are controlled to be disconnected, a generator is prevented from reversely supplying power to the power grid end, and the safety of maintainers is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of electronic power technology, and in particular to a power supply control circuit and a power supply control device. Background Art

[0002] Three-phase electricity refers to an electric power system consisting of three phases of AC power. These three phases are usually referred to as phase A, phase B, and phase C, and are replaced by R, S, and T in the industry. There is also an N line in the three-phase power grid, which represents the neutral line, also known as the zero line. The N line is used together with the three phase lines (R, S, T) to balance the load of the three-phase system and provide a loop. In a three-phase power grid, the voltage between each phase line and the N line is 220V, and the voltage between adjacent phase lines is 380V.

[0003] The inverter is used to convert direct current (DC) into alternating current (AC) to ensure that the inverter can operate reliably and efficiently. The power required by various control and monitoring circuits inside the inverter can be provided by the inverter auxiliary power supply or by an external power supply (such as the power grid and motor). While being powered by the external power supply, the inverter auxiliary power supply is also charged. The power grid or motor needs to pass through the rectifier bridge and then be combined through the transformer to reduce the voltage before it can power the internal components of the inverter and the auxiliary power supply.

[0004] When the power grid is powered off for maintenance, the motor is powered and there is only one rectifier bridge between it and the grid. If the rectifier bridge fails or breaks down, the generator will reversely transmit power to the grid, threatening the safety of the maintenance personnel. Utility Model Content

[0005] The embodiments of the present application provide a power supply control circuit and a power supply control device for disconnecting the power grid and the inverter to ensure the safety of maintenance personnel.

[0006] In a first aspect, an embodiment of the present application provides a power supply control circuit, including: a rectifier module, a transformer module and a switch module;

[0007] The input end of the rectifier module is connected to the grid end, the first output end of the rectifier module is connected to the input end of the transformer module, and the second output end of the rectifier module is grounded;

[0008] The output end of the transformer module is connected to the first end of the switch module;

[0009] The second end of the switch module is connected to the second output end of the rectifier module, the third end of the switch module is connected to the grid end, and the fourth end of the switch module is connected to the internal device of the inverter;

[0010] When there is electricity at the grid end, the rectifier module is used to convert the AC power provided by the grid end into DC power, and the transformer module is used to step down the DC power output by the rectifier module to control the third and fourth terminals of the switch module to be turned on, so that the grid end supplies power to the internal devices of the inverter;

[0011] When the grid end is powered off, the third end and the fourth end of the switch module are disconnected to control the grid end and the internal components of the inverter to be disconnected.

[0012] In a possible implementation, the switch module includes a first relay and a second relay;

[0013] The first end of the first relay and the first end of the second relay serve as the first end of the switch module;

[0014] The second end of the first relay and the second end of the second relay serve as the second end of the switch module;

[0015] The third end of the first relay serves as the third end of the switch module, and the fourth end of the first relay is connected to the third end of the second relay;

[0016] The fourth end of the second relay serves as the fourth end of the switch module;

[0017] When there is electricity at the grid end, the third end and the fourth end of the first relay are connected, and the third end and the fourth end of the second relay are connected, so that the grid end supplies power to the internal devices of the inverter;

[0018] When the grid end is powered off, the third and fourth ends of the first relay are disconnected, and the third and fourth ends of the second relay are disconnected, so that the grid end and the internal components of the inverter are disconnected.

[0019] In a possible implementation manner of the transformer module, the first relay includes a first contact and a second contact, and the second relay includes a third contact and a fourth contact;

[0020] The first contact serves as a third terminal of the first relay, and the second contact serves as a fourth terminal of the first relay;

[0021] The third contact serves as the third end of the second relay, and the fourth contact serves as the fourth end of the second relay;

[0022] When there is electricity at the grid end, the first contact is connected to the second contact to control the third end and the fourth end of the first relay to be connected, and the third contact is connected to the fourth contact to control the third end and the fourth end of the second relay to be connected;

[0023] When the grid end is powered off, the first contact and the second contact are disconnected to control the third and fourth ends of the first relay to be disconnected, and the third contact and the fourth contact are disconnected to control the third and fourth ends of the second relay to be disconnected.

[0024] In a possible implementation manner, the first relay includes a first coil, and the second relay includes a second coil;

[0025] The first end of the first coil serves as the first end of the first relay, and the second end of the first coil serves as the second end of the first relay;

[0026] The first end of the second coil serves as the first end of the second relay, and the second end of the second coil serves as the second end of the second relay;

[0027] When there is electricity at the grid end, the first coil is energized to control the third end and the fourth end of the first relay to be connected, and the second coil is energized to control the third end and the fourth end of the second relay to be connected;

[0028] When the grid end is powered off, the first coil is disconnected to control the third and fourth ends of the first relay to be disconnected, and the second coil is disconnected to control the third and fourth ends of the second relay to be disconnected.

[0029] In a possible implementation, the invention further includes: a first diode and a second diode;

[0030] An anode of the first diode is connected to the second end of the first coil, and a cathode of the first diode is connected to the first end of the first coil;

[0031] An anode of the second diode is connected to the second end of the second coil, and a cathode of the second diode is connected to the first end of the second coil.

[0032] In a possible implementation manner, the rectifier module includes a first output end and a second output end, the first output end is connected to the transformer module, and the second output end is grounded;

[0033] The circuit further comprises:

[0034] A capacitor connected between the first output terminal and the second output terminal;

[0035] and / or, a variable resistor, the variable resistor being connected between the first output terminal and the second output terminal;

[0036] and / or, a first resistor, wherein the first resistor is connected between the first output terminal and the second output terminal.

[0037] In a possible implementation manner, the voltage transformation module includes a feedback input pin, a peak current detection pin, a power supply pin and a reference ground pin;

[0038] The power supply control circuit also includes:

[0039] A second resistor, wherein the second resistor is connected between the peak current detection pin and a reference ground pin;

[0040] and / or, a third resistor, the third resistor being connected between the feedback input pin and the reference ground pin;

[0041] and / or, a fourth resistor, a first capacitor and a first inductor, wherein a first end of the fourth resistor is connected to the power supply pin, a second end of the fourth resistor is connected to a first end of the first capacitor, and a second end of the first capacitor is connected to the reference ground pin and a first end of the first inductor;

[0042] And / or, a third diode, wherein the anode of the third diode is connected to the reference ground pin, and the cathode of the third diode is connected to the second end of the fourth resistor.

[0043] In a possible implementation manner, the rectifier module includes a second output terminal, and the transformer module includes a reference ground pin;

[0044] The power supply control circuit also includes:

[0045] a fourth diode, wherein an anode of the fourth diode is connected to the second output terminal, and a cathode of the fourth diode is connected to the reference ground pin;

[0046] and / or, a second capacitor, the second capacitor being connected between the second output terminal and the reference ground pin;

[0047] and / or, a fifth resistor, the fifth resistor being connected between the second output terminal and the reference ground pin;

[0048] A polarity capacitor, wherein the positive electrode of the polarity capacitor is connected to the reference ground pin, and the negative electrode of the polarity capacitor is connected to the second output terminal.

[0049] In a second aspect, the present application provides a power supply control device, comprising the power supply control circuit described in the first aspect.

[0050] In a possible implementation manner, the device further includes: an inverter internal device;

[0051] The power supply control circuit is connected to the internal components of the inverter;

[0052] When the grid end has power, the power supply control circuit controls the grid end to supply power to the internal devices of the inverter. When the grid end is powered off, the power supply control circuit controls the grid end and the internal devices of the inverter to be disconnected.

[0053] The power supply control circuit and power supply control device provided by the embodiment of the present application include a rectifier module, a transformer module and a switch module, the input end of the rectifier module is connected to the grid end, the first output end of the rectifier module is connected to the input end of the transformer module, the second output end of the rectifier module is grounded, the output end of the transformer module is connected to the first end of the switch module, the second end of the switch module is connected to the second output end of the rectifier module, the third end of the switch module is connected to the grid end, and the fourth end of the switch module is connected to the internal components of the inverter. When there is electricity at the grid end, the rectifier module and the transformer module rectify and reduce the voltage provided by the grid end, and control the third and fourth ends of the switch module to be turned on, so that the grid end can supply power to the internal components of the inverter. When the grid end is powered off, the third and fourth ends of the switch module are disconnected to disconnect the grid end and the internal components of the inverter, and control the grid end and the inverter to disconnect, so as to prevent the generator from reversely supplying power to the grid end and ensure the safety of the maintenance personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0055] Figure 1 The power supply diagram provided for this application;

[0056] Figure 2 A schematic diagram of the structure of the power supply control circuit provided in this application;

[0057] Figure 3 This is a circuit diagram of the power supply control circuit provided in this application.

[0058] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0059] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0060] The current external power source includes a power grid 20 and a generator 30. The power grid 20 and the generator 30 output AC power. The AC power output by the power grid 20 and the AC power output by the generator 30 are respectively rectified by the rectifier bridge 201 and the rectifier bridge 301 and then merged. After being stepped down by the transformer 202, they can supply power to the inverter auxiliary power supply 203 of the photovoltaic inverter. The inverter auxiliary power supply 203 is used to supply power to the control circuit of the inverter. Therefore, the line of the power grid 20 after rectification and step-down processing is connected with the line of the generator 30 after rectification and step-down processing, such as Figure 1 As shown, the grid side and the motor side are isolated only by the rectifier bridge.

[0061] When the power grid is out and someone is repairing the grid, in order to prevent the generator from reversely transmitting power to the grid, the grid and the inverter need to be physically isolated. Otherwise, there is only one rectifier bridge to isolate the grid side and the motor side. If the rectifier bridge fails, a strong voltage will exist on the grid side, affecting the safety of the maintenance personnel.

[0062] To this end, the present application provides a power supply control circuit, including a rectifier module, a transformer module and a switch module, wherein the first end of the switch module is connected to the output end of the transformer module, the second end of the switch module is connected to the second output end of the rectifier module, the third end of the switch module is connected to the grid end, and the fourth end of the switch module is connected to the internal components of the inverter. When there is electricity at the grid end, the rectifier module and the transformer module rectify and reduce the voltage provided by the grid end, and then control the third and fourth ends of the switch module to be turned on, so that the grid end can supply power to the internal components of the inverter. When the grid end is powered off, the third and fourth ends of the switch module are disconnected to disconnect the grid end and the internal components of the inverter, control the grid end and the inverter to be disconnected, prevent the generator from reversely supplying power to the grid end, ensure the safety of maintenance personnel, and comply with safety regulations.

[0063] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0064] Figure 2 A schematic diagram of the structure of the power supply control circuit provided in the embodiment of the present application is shown in FIG. Figure 2 As shown, the power supply control circuit 10 provided in the embodiment of the present application includes:

[0065] A rectifier module 101, a transformer module 102 and a switch module 103, wherein the rectifier module 101 includes a first input terminal 0 and a second input terminal 1, a first output terminal 2 and a second output terminal 3, the transformer module 102 includes an input terminal 4 and an output terminal 5, and the switch module 103 includes a first terminal 6, a second terminal 7, a third terminal 8 and a fourth terminal 9;

[0066] The first input terminal 0 and the second input terminal 1 of the rectifier module 101 are connected to the grid terminal 20, the first output terminal 2 of the rectifier module 101 is connected to the input terminal 4 of the transformer module 102, and the second output terminal 3 of the rectifier module 101 is grounded;

[0067] The output terminal 5 of the transformer module 102 is connected to the first terminal 6 of the switch module 103;

[0068] The second end 7 of the switch module 103 is connected to the second output end 3 of the rectifier module 101, the third end 8 of the switch module 103 is connected to the grid end 20, and the fourth end 9 of the switch module 103 is connected to the inverter internal device 40;

[0069] When the grid end 20 has electricity, the rectifier module 101 is used to convert the AC power provided by the grid end 20 into DC power, and the transformer module 102 is used to step down the DC power output by the rectifier module 101 to control the third terminal 8 and the fourth terminal 9 of the switch module 103 to be turned on, so that the grid end 20 supplies power to the internal components 40 of the inverter;

[0070] When the grid terminal 20 is disconnected, the third terminal 8 and the fourth terminal 9 of the switch module 103 are disconnected to control the grid terminal 20 and the internal components 40 of the inverter to be disconnected.

[0071] In the embodiment of the present application, after the voltage provided by the grid terminal 20 is processed by the rectifier module 101 and the transformer module 102, the third terminal 8 and the fourth terminal 9 of the switch module 103 can be controlled to be turned on, so that the grid terminal 20 can supply power to the internal device 40 of the inverter. Correspondingly, when the grid terminal 20 is disconnected, the third terminal 8 and the fourth terminal 9 of the switch module 103 are disconnected, so that the grid terminal 20 and the internal device 40 of the inverter can be controlled to be disconnected, and then the grid terminal 20 and the power transmission side of the motor can be isolated, so as to prevent the generator from reversely transmitting power to the grid terminal 20, ensure the safety of the maintenance personnel, and comply with the design of safety regulations. In addition, the rectifier module 101 and the transformer module 102 are used to control the switch module 103 to be turned on or off, so as to realize that the grid terminal 20 supplies power to the internal device 40 of the inverter, or realizes the disconnection of the grid terminal 20 and the internal device 40 of the inverter, which can simplify the circuit structure and improve safety.

[0072] For example, the inverter internal device 40 may include an inverter auxiliary power supply or other operating devices, and the inverter auxiliary power supply can provide the required power for various control circuits and monitoring circuits inside the inverter. There are many control circuits inside the inverter, which are responsible for the operating status of the inverter, executing control algorithms, adjusting output voltage and frequency, etc. The inverter auxiliary power supply can provide stable power for these control circuits. The inverter can be configured with monitoring and communication modules for real-time monitoring of system performance, recording data, reporting fault status, etc. The inverter auxiliary power supply can provide power for these modules to ensure continuous monitoring and data transmission. The inverter can include a variety of protection functions, such as overvoltage, overcurrent, short circuit, overheating protection, etc. The inverter auxiliary power supply can provide reliable power support for these protection functions to quickly respond and protect the equipment when necessary.

[0073] In practical applications, combined with Figure 2 and Figure 3 As shown, the first output terminal Grid-R1 of the grid terminal 20 and the first input terminal 0 of the rectifier module 101 are connected via a phase line, and the second output terminal Grid-N of the grid terminal 20 and the second input terminal 1 of the rectifier module 101 are connected via a neutral line. The phase line is used to transmit the phase voltage of the alternating current and is a live conductor. The neutral line usually works together with the phase line to provide an alternating current loop.

[0074] In a specific embodiment, Figure 3 As shown, a fuse F1 is provided between the first output terminal Grid-R1 of the grid end 20 and the first input terminal 0 of the rectifier module 101. The fuse F1 can be quickly blown when the current exceeds a predetermined value, thereby cutting off the circuit to prevent excessive current from damaging the rectifier module 101 or other equipment.

[0075] In a specific embodiment, Figure 3 As shown, a resistor R455 is provided between the second output terminal Grid-N of the grid terminal 20 and the second input terminal 1 of the rectifier module 101. The resistor R455 may be a PTC (Positive Temperature Coefficient) thermistor, which may be used to limit the current passing through the neutral line, especially under unbalanced load or fault conditions, to protect equipment and circuits.

[0076] In some embodiments, in combination Figure 2 and Figure 3 As shown, the rectifier module 101 may be a rectifier chip 1011, for example, the rectifier chip 1011 may be a DB207 series chip, and the DB207 series chip may include DB207, DB207S, etc. The rectifier module 101 may also be a bridge rectifier circuit composed of four diodes.

[0077] For example, the transformer module 102 may be a power buck chip 1021 , for example, the power buck chip 1021 is a KP1505 series chip, the KP1505 series chip contains four MOS tubes, and the KP1505 series chips may include KP1505ASPA, KP15051SPA, KP15052SPA, etc.

[0078] It should be noted that the KP1505 series is a high-performance, low-cost pulse width modulation (PWM) power switch suitable for offline low-power step-down applications, with simple peripheral circuits and a small number of devices. At the same time, the product has a built-in high-voltage metal oxide semiconductor field effect transistor (MOSFET) to improve the system's surge tolerance. Unlike traditional PWM controllers, the KP1505 series does not have a fixed clock to drive the MOSFET, and the system switching frequency can be automatically adjusted as the load changes. At the same time, the chip uses multi-mode PWM control technology, which effectively simplifies the peripheral circuit design, improves the linear regulation rate and load regulation rate, and eliminates audible noise during system operation. In addition, the internal peak current detection threshold of the chip can be automatically adjusted according to the actual load conditions, which can effectively reduce the standby power consumption under no-load conditions. The KP1505 series integrates a complete set of protection functions with self-recovery functions: VDD undervoltage protection, cycle-by-cycle current limiting, output overvoltage protection, overheating protection, overload protection, and VDD overvoltage protection.

[0079] In some embodiments, Figure 3 As shown, the switch module 103 includes a first relay RY9 and a second relay RY10, the first relay RY9 includes a first end 11, a second end 12, a third end 15 and a fourth end 16, and the second relay RY10 includes a first end 13, a second end 14, a third end 17 and a fourth end 18. The first end 11 of the first relay RY9 and the first end 13 of the second relay RY10 serve as the first end 6 of the switch module 103, that is, the first end 11 of the first relay RY9 and the first end 12 of the second relay RY10 are both connected to the output end 5 of the transformer module 102. The second end 12 of the first relay RY9 and the second end 14 of the second relay RY10 serve as the second end 7 of the switch module 103, that is, the second end 12 of the first relay RY9 and the second end 14 of the second relay RY10 are both connected to the second output end 3 of the rectifier module 101. The third end 15 of the first relay RY9 serves as the third end 8 of the switch module 103, connected to the first output end Grid-R1 of the grid end 20, the fourth end 16 of the first relay RY9 is connected to the third end 17 of the second relay RY10, and the fourth end 18 of the second relay RY10 serves as the fourth end 9 of the switch module 103, connected to the internal device 40 of the inverter.

[0080] Correspondingly, when there is electricity at the grid end 20, the rectifier module 101 is used to convert the AC power provided by the grid end 20 into DC power, and the transformer module 102 is used to step down the DC power output by the rectifier module 101 to control the third end 15 and the fourth end 16 of the first relay RY9 to be connected and to control the third end 17 and the fourth end 18 of the second relay RY10 to be connected, so that the grid end 20 and the internal components 40 of the inverter can be connected, so that the grid end 20 can supply power to the internal components 40 of the inverter.

[0081] When the grid end 20 is powered off, the rectifier module 101 and the transformer module 102 do not work, and the conduction voltage cannot be provided to the first relay RY9 and the second relay RY10. The third end 15 and the fourth end 16 of the first relay RY9 are disconnected, and the third end 17 and the fourth end 18 of the second relay RY10 are also disconnected. The grid end 20 and the internal device 40 of the inverter are disconnected, so that the grid end 20 and the inverter are physically isolated, and the generator and the grid end 20 will not be connected through the inverter, preventing the generator from reversely transmitting power to the grid end 20, thereby ensuring the safety of maintenance personnel.

[0082] In addition, the switch module 103 includes two relays, which can meet safety regulations, and considering that the contact distance between one relay is relatively short, using two relays can extend the contact distance and improve safety. In addition, the two relays can provide redundancy to improve the reliability and fault tolerance of the system. If one relay fails, the other relay can continue to work to ensure the continuous operation of the system.

[0083] In some other examples, the switch module 103 may include only one relay, for example, may include a first relay RY9 or a second relay RY10.

[0084] In some examples, the first relay RY9 includes a first contact a and a second contact b, and the second relay RY10 includes a third contact c and a fourth contact d. The first contact a serves as the third terminal 15 of the first relay RY9, connected to the grid terminal 20 through the phase line Grid-R1, and the second contact b serves as the fourth terminal 16 of the first relay RY9, connected to the third terminal 17 of the second relay RY10. The third contact c serves as the third terminal 17 of the second relay RY10, connected to the fourth terminal 16 of the first relay RY9, that is, the third contact c is connected to the second contact b, and the fourth contact d serves as the fourth terminal 18 of the second relay RY10, connected to the inverter internal device 40.

[0085] When there is electricity at the grid end 20, the rectifier module 101 and the transformer module 102 process the AC power provided by the grid end 20 to control the connection between the first contact a and the second contact b of the first relay RY9, so as to control the connection between the third end 15 and the fourth end 16 of the first relay RY9, and at the same time, the third contact c and the fourth contact d of the second relay RY10 can be controlled to be connected, so as to control the connection between the third end 17 and the fourth end 18 of the second relay RY10, thereby controlling the grid end 20 and the internal device 40 of the inverter to be connected, so that the grid end 20 can supply power to the internal device 40 of the inverter.

[0086] When the grid end 20 is powered off, the rectifier module 101 and the transformer module 102 do not work, and the first contact a and the second contact b of the first relay RY9 are disconnected to control the third end 15 and the fourth end 16 of the first relay RY9 to be disconnected. At the same time, the third contact c and the fourth contact d of the second relay RY10 are disconnected to control the third end 17 and the fourth end 18 of the second relay RY10 to be disconnected, thereby controlling the grid end 20 and the internal device 40 of the inverter to be disconnected, so that the grid end 20 and the inverter are physically isolated to ensure the safety of the maintenance personnel when the grid is powered off for maintenance.

[0087] In other examples, the first relay RY9 includes a fifth terminal 19 and a sixth terminal 20, and the second relay RY10 includes a fifth terminal 21 and a sixth terminal 22. The fifth terminal 19 of the first relay RY9 is connected to one phase Grid-S1 of the three-phase AC power at the grid end, the sixth terminal 20 of the first relay RY9 is connected to the fifth terminal 21 of the second relay RY10, and the sixth terminal 22 of the second relay RY10 is connected to one phase Grid-S2 of the three-phase AC power at the grid end.

[0088] As a specific implementation, the first relay RY9 includes a fifth contact e and a sixth contact f, and the second relay RY10 includes a seventh contact g and an eighth contact h. The fifth contact e serves as the fifth terminal 19 of the first relay RY9; the sixth contact f serves as the sixth terminal 20 of the first relay RY9, connected to the fifth terminal 21 of the second relay RY10; the seventh contact g serves as the fifth terminal 21 of the second relay RY10, connected to the sixth contact f; and the eighth contact h serves as the sixth terminal 22 of the second relay RY10.

[0089] In a specific embodiment, the first relay RY9 includes a first coil HF1, and the second relay RY10 includes a second coil HF2. The first end of the first coil HF1 serves as the first end 11 of the first relay RY9, connected to the output end 5 of the transformer module 102; the second end of the first coil HF1 serves as the second end 12 of the first relay RY9, connected to the second output end 3 of the rectifier module 101. The first end of the second coil HF2 serves as the first end 13 of the second relay RY10, connected to the output end 5 of the transformer module 102; the second end of the second coil HF2 serves as the second end 14 of the second relay RY10, connected to the second output end 3 of the rectifier module 101.

[0090] When there is electricity at the grid end 20, the first coil HF1 is energized to control the third end 15 and the fourth end 16 of the first relay RY9 to be connected, and the second coil HF2 is also energized to control the third end 17 and the fourth end 18 of the second relay RY10 to be connected, thereby connecting the grid end 20 and the internal device 40 of the inverter, so that the grid end 20 can supply power to the internal device 40 of the inverter.

[0091] When the grid end 20 is powered off, the first coil HF1 is powered off to control the third end 15 and the fourth end 16 of the first relay RY9 to be disconnected, and the second coil HF2 is also powered off to control the third end 17 and the fourth end 18 of the second relay RY10 to be disconnected, thereby disconnecting the grid and the internal device 40 of the inverter, thereby realizing the physical isolation of the grid end 20 and the inverter.

[0092] Specifically, the first contact a is connected to the first armature. When the first coil HF1 is energized, the first armature attracts the second contact b to connect the first contact a and the second contact b, thereby connecting the third end 15 and the fourth end 16 of the first relay RY9. When the first coil HF1 is de-energized, the first armature is disconnected to disconnect the first contact a and the second contact b, thereby disconnecting the third end 15 and the fourth end 16 of the first relay RY9.

[0093] The fourth contact d is connected to a second armature. When the second coil HF2 is energized, the second armature attracts the third contact c to connect the fourth contact d with the third contact c, thereby connecting the third end 17 and the fourth end 18 of the second relay RY10. When the second coil HF2 is de-energized, the second armature disconnects to disconnect the third contact c and the fourth contact d, thereby disconnecting the third end 17 and the fourth end 18 of the second relay RY10.

[0094] The sixth contact f is connected to the third armature. When the first coil HF1 is energized, the third armature attracts the fifth contact e to connect the sixth contact f with the fifth contact e, thereby connecting the fifth end 19 and the sixth end 20 of the first relay RY9. When the first coil HF1 is de-energized, the third armature is disconnected to disconnect the fifth contact e and the sixth contact f, thereby disconnecting the fifth end 19 and the sixth end 20 of the first relay RY9.

[0095] The seventh contact g is connected to the fourth armature. When the second coil HF2 is energized, the fourth armature attracts the seventh contact g to connect the seventh contact g with the eighth contact h, thereby connecting the fifth end 21 and the sixth end 22 of the second relay RY10. When the second coil HF2 is disconnected, the fourth armature is disconnected to disconnect the seventh contact g and the eighth contact h, thereby disconnecting the fifth end 21 and the sixth end 22 of the second relay RY10.

[0096] In a specific embodiment, the power supply control circuit 10 includes a first diode D1 and a second diode D2. The anode of the first diode D1 is connected to the second end of the first coil HF1, and the cathode of the first diode D1 is connected to the first end of the first coil HF1; the anode of the second diode D2 is connected to the second end of the second coil HF2, and the cathode of the second diode D2 is connected to the first end of the second coil HF2.

[0097] When the first coil HF1 is energized, a magnetic field is generated. When the first coil HF1 is disconnected, the magnetic field collapses rapidly, resulting in a reverse electromotive force in the first coil HF1. ​​The first diode D1 is connected in parallel with the first coil HF1, which can provide a low-impedance path for the reverse electromotive force generated by the first coil HF1. ​​The first diode D1 is turned on when the reverse electromotive force appears, so that current can circulate between the first diode D1 and the first coil HF1, thereby preventing high voltage from damaging the circuit.

[0098] Similarly, when the second coil HF2 is energized, a magnetic field is generated. When the second coil HF2 is disconnected, the magnetic field collapses rapidly, causing a reverse electromotive force to be generated in the second coil HF2. The second diode D2 is connected in parallel with the second coil HF2, which can provide a low-impedance path for the reverse electromotive force generated by the second coil HF2. The second diode D2 is turned on when the reverse electromotive force appears, so that current can circulate between the second diode D2 and the second coil HF2, preventing high voltage from damaging the circuit.

[0099] In a specific embodiment, in combination Figure 2 and Figure 3As shown, the rectifier module 101 includes a first output terminal 2 and a second output terminal 3, the first output terminal 2 is connected to the transformer module 102, and the second output terminal 3 is grounded. The power supply control circuit 10 may include a capacitor C192, the capacitor C192 is connected between the first output terminal 2 and the second output terminal 3 of the rectifier module 101, and the capacitor C192 can be used to filter the direct current output by the rectifier module 101, smooth the output voltage after rectification of the rectifier module 101, improve the power quality, and reduce electromagnetic interference. For example, the capacity of the capacitor C192 can be 10μF, and the rated voltage is 450V.

[0100] In a specific implementation, the power supply control circuit 10 includes a variable resistor RV10, which is connected between the first output terminal 2 and the second output terminal 3 of the rectifier module 101. By adjusting the resistance value of the variable resistor RV10, the voltage distribution in the circuit can be adjusted, thereby achieving control of the voltage of the load 30, and suppressing the current size to protect the load 30 or the circuit from overcurrent. For example, the rated voltage of the varistor of the variable resistor RV10 can be 385V.

[0101] In a specific embodiment, the power supply control circuit 10 may include a first resistor, which is connected between the first output terminal 2 and the second output terminal 3 of the rectifier module 101. The first resistor can limit the current passing through the circuit and protect other components in the circuit from overcurrent damage. The first resistor can form a filter circuit with a capacitor to help smooth the rectified output voltage and reduce ripple and noise.

[0102] For example, the first resistor may include a plurality of resistors connected in series, such as Figure 3 As shown, it includes a resistor R436 and a resistor R437 connected in series. The resistance value of the resistor R436 and the resistor R437 can be 200K.

[0103] In a specific implementation, the voltage transformation module 102 includes a drain pin Drain, a power supply pin VDD, a feedback input pin FB, a peak current detection pin CS, and a reference ground pin GND.

[0104] The power supply pin VDD receives the initial current from the drain pin Drain during the startup phase, and receives the stable voltage from the auxiliary winding during the normal operation phase, ensuring that the control chip can obtain a stable voltage supply throughout the entire working process.

[0105] The feedback input pin FB is used to monitor the output voltage and feed it back to the control circuit, and the peak current detection pin CS is used to monitor the current through the inductor or the load 30 to prevent circuit overload, protect components and auxiliary. The power supply control circuit 10 may include a second resistor, which is connected between the feedback input pin FB and the reference ground pin GND of the transformer module 102. By accurately controlling the resistance value of the second resistor, the stability of the feedback loop can be ensured and the stability of the output voltage can be improved.

[0106] For example, the second resistor may include a plurality of resistors connected in parallel, such as a resistor R438 and a resistor R439 connected in parallel, and the resistance of the resistor R438 and the resistor R439 is 1R.

[0107] In a specific embodiment, the power supply control circuit 10 also includes a non-soldered third resistor R441, which can be welded according to actual conditions. The third resistor R441 is connected between the feedback input pin FB and the reference ground pin GND of the transformer module 102. The feedback voltage can be changed through the third resistor R441, thereby setting or adjusting the output voltage, helping the transformer module 102 to maintain a stable output voltage.

[0108] In a specific embodiment, the power supply control circuit 10 further includes a first capacitor C194, a third capacitor C195, a second capacitor C196, a fourth diode D58, a polar capacitor C197 and a first inductor L11. The second end of the first capacitor C194 is connected to the reference ground pin GND of the transformer module 102 and the first end of the first inductor L11, the third capacitor C195 is connected to the power supply pin VDD of the transformer module 102 and the first end of the first inductor L11, the second capacitor C196 is connected between the second output terminal 3 of the rectifier module 101 and the reference ground pin GND of the transformer module 102, the anode of the fourth diode D58 is connected to the second output terminal 3 of the rectifier module 101, the cathode of the fourth diode D58 is connected to the reference ground pin GND of the transformer module 102, the positive electrode of the polar capacitor C197 is connected to the reference ground pin GND of the transformer module 10, and the negative electrode of the polar capacitor C197 is connected to the second output terminal of the rectifier module 102. The above devices form a step-down voltage regulator circuit to meet the voltage reduction requirements.

[0109] For example, the capacitance of the first capacitor C194 may be 104, the capacitance of the third capacitor C195 may be 105, the capacitance of the second capacitor C196 may be 104, the capacitance of the polar capacitor C197 may be 100µF, and the rated voltage may be 16V.

[0110] In a specific implementation, a fourth resistor R442 is also included, a first end of the fourth resistor R442 is connected to the power supply pin VDD of the transformer module 102, a second end of the fourth resistor R442 is connected to the first end of the first capacitor C194, and the resistance value of the fourth resistor R442 can be 0R. A 0 ohm resistor can be used as a jumper on a circuit board to facilitate automated surface mount technology production. Compared with using actual wire jumpers, a 0 ohm resistor can be more easily placed and welded by a machine.

[0111] In a specific implementation, the power supply control circuit 10 further includes a fifth resistor R443, which is connected between the second output terminal of the rectifier module 101 and the reference ground pin GND of the transformer module 102. The fifth resistor R442 can be used to reduce the output voltage of the transformer module 102 and limit the current flowing through the circuit to protect subsequent circuit components from damage caused by overcurrent.

[0112] For example, the resistance of the fifth resistor R443 may be 1K.

[0113] The power supply control circuit provided in the embodiment of the present application is described in detail above. The embodiment of the present application also provides a power supply control device, including the above-mentioned power supply control circuit.

[0114] In some embodiments, the power supply control device also includes internal components of the inverter, and the power supply control circuit is connected to the internal components of the inverter; when there is electricity on the grid end, the power supply control circuit controls the grid end to supply power to the internal components of the inverter, and when the grid end is powered off, the power supply control circuit controls the grid end and the internal components of the inverter to be disconnected. The cleverness of this embodiment lies in that the power supply control circuit is closely linked to the grid. The power supply control circuit is equivalent to a small power supply made with the help of the electricity of the grid to power the relay. In this way, when the grid is powered off, the small power supply is also powered off, so that the relay is disconnected, achieving strong isolation between the grid and the inverter and generator side, ensuring the safety of construction personnel and complying with safety regulations.

[0115] Finally, it should be noted that those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art not disclosed by the present invention, are not limited to the precise structure described above and shown in the drawings, and may be modified and changed in various ways without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A power supply control circuit, characterized in that: include: Rectifier module, transformer module and switch module; The input end of the rectifier module is connected to the grid end, the first output end of the rectifier module is connected to the input end of the transformer module, and the second output end of the rectifier module is grounded; The output end of the transformer module is connected to the first end of the switch module; The second end of the switch module is connected to the second output end of the rectifier module, the third end of the switch module is connected to the grid end, and the fourth end of the switch module is connected to the internal device of the inverter; When there is electricity at the grid end, the rectifier module is used to convert the AC power provided by the grid end into DC power, and the transformer module is used to step down the DC power output by the rectifier module to control the third and fourth terminals of the switch module to be turned on, so that the grid end supplies power to the internal devices of the inverter; When the grid end is powered off, the third end and the fourth end of the switch module are disconnected to control the grid end and the internal components of the inverter to be disconnected.

2. The power supply control circuit according to claim 1, characterized in that: The switch module includes a first relay and a second relay; The first end of the first relay and the first end of the second relay serve as the first end of the switch module; The second end of the first relay and the second end of the second relay serve as the second end of the switch module; The third end of the first relay serves as the third end of the switch module, and the fourth end of the first relay is connected to the third end of the second relay; The fourth end of the second relay serves as the fourth end of the switch module; When there is electricity at the grid end, the third end and the fourth end of the first relay are connected, and the third end and the fourth end of the second relay are connected, so that the grid end supplies power to the internal devices of the inverter; When the grid end is powered off, the third and fourth ends of the first relay are disconnected, and the third and fourth ends of the second relay are disconnected, so that the grid end and the internal components of the inverter are disconnected.

3. The power supply control circuit according to claim 2, characterized in that: The first relay includes a first contact and a second contact, and the second relay includes a third contact and a fourth contact; The first contact serves as a third terminal of the first relay, and the second contact serves as a fourth terminal of the first relay; The third contact serves as the third end of the second relay, and the fourth contact serves as the fourth end of the second relay; When there is electricity at the grid end, the first contact is connected to the second contact to control the third end and the fourth end of the first relay to be connected, and the third contact is connected to the fourth contact to control the third end and the fourth end of the second relay to be connected; When the grid end is powered off, the first contact and the second contact are disconnected to control the third and fourth ends of the first relay to be disconnected, and the third contact and the fourth contact are disconnected to control the third and fourth ends of the second relay to be disconnected.

4. The power supply control circuit according to claim 3, characterized in that: The first relay includes a first coil, and the second relay includes a second coil; The first end of the first coil serves as the first end of the first relay, and the second end of the first coil serves as the second end of the first relay; The first end of the second coil serves as the first end of the second relay, and the second end of the second coil serves as the second end of the second relay; When there is electricity at the grid end, the first coil is energized to control the third end and the fourth end of the first relay to be connected, and the second coil is energized to control the third end and the fourth end of the second relay to be connected; When the grid end is powered off, the first coil is disconnected to control the third and fourth ends of the first relay to be disconnected, and the second coil is disconnected to control the third and fourth ends of the second relay to be disconnected.

5. The power supply control circuit according to claim 4, characterized in that: Also includes: a first diode and a second diode; An anode of the first diode is connected to the second end of the first coil, and a cathode of the first diode is connected to the first end of the first coil; An anode of the second diode is connected to the second end of the second coil, and a cathode of the second diode is connected to the first end of the second coil.

6. The power supply control circuit according to any one of claims 1 to 5, characterized in that: The rectifier module comprises a first output end and a second output end, the first output end is connected to the transformer module, and the second output end is grounded; The power supply control circuit also includes: A capacitor connected between the first output terminal and the second output terminal; and / or, a variable resistor, the variable resistor being connected between the first output terminal and the second output terminal; and / or, a first resistor, wherein the first resistor is connected between the first output terminal and the second output terminal.

7. The power supply control circuit according to any one of claims 1 to 5, characterized in that: The voltage transformation module includes a feedback input pin, a peak current detection pin, a power supply pin and a reference ground pin; The power supply control circuit also includes: A second resistor, wherein the second resistor is connected between the peak current detection pin and a reference ground pin; and / or, a third resistor, the third resistor being connected between the feedback input pin and the reference ground pin; and / or, a fourth resistor, a first capacitor and a first inductor, wherein a first end of the fourth resistor is connected to the power supply pin, a second end of the fourth resistor is connected to a first end of the first capacitor, and a second end of the first capacitor is connected to the reference ground pin and a first end of the first inductor; And / or, a third diode, wherein the anode of the third diode is connected to the reference ground pin, and the cathode of the third diode is connected to the second end of the fourth resistor.

8. The power supply control circuit according to any one of claims 1 to 5, characterized in that: The rectifier module includes a second output terminal, and the transformer module includes a reference ground pin; The power supply control circuit also includes: a fourth diode, wherein an anode of the fourth diode is connected to the second output terminal, and a cathode of the fourth diode is connected to the reference ground pin; and / or, a second capacitor, the second capacitor being connected between the second output terminal and the reference ground pin; and / or, a fifth resistor, the fifth resistor being connected between the second output terminal and the reference ground pin; A polarity capacitor, wherein the positive electrode of the polarity capacitor is connected to the reference ground pin, and the negative electrode of the polarity capacitor is connected to the second output terminal.

9. A power supply control device, characterized in that: The invention comprises the power supply control circuit as described in any one of claims 1 to 8.

10. The power supply control device according to claim 9, characterized in that: Also includes: inverter internal devices; The power supply control circuit is connected to the internal components of the inverter; When the grid end has power, the power supply control circuit controls the grid end to supply power to the internal devices of the inverter. When the grid end is powered off, the power supply control circuit controls the grid end and the internal devices of the inverter to be disconnected.

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