Dual-power change-over switch system

Abstract

The utility model discloses a dual-power-supply change-over switch system, which comprises a shell and a plurality of functional modules, and is internally provided with a dual-power-supply automatic change-over switch, a charging controller, a power supply state monitoring module, a micro-control unit, a power supply input switch and other modules, and dual-power-supply input is realized through a generator power supply interface and a mains supply interface. The shell is provided with a composite interface integrated charging and control signal transmission, the wiring complexity is reduced, and the installation convenience is improved. The system has the functions of power frequency and voltage monitoring, automatic power switching and generator storage battery intelligent charging management, can automatically switch to a standby generator for power supply when a main power supply is abnormal, performs intelligent charging control on a generator storage battery, prolongs the service life of the storage battery, and improves the reliability of a power supply system.

Description

TECHNICAL FIELD

[0001] The utility model relates to power conversion switch technical field especially relates to a dual power conversion switch system. BACKGROUND

[0002] With the increasing demand for electricity in modern society, the stability and continuity requirements of the power supply system are also increasingly high. In many scenarios, such as communication base stations, data centers, industrial production lines, any form of power interruption will cause huge economic losses or safety hazards. In order to ensure the continuity of power supply, the power conversion switch has become one of the core devices to protect uninterrupted power supply. It is usually used to quickly switch to the standby power supply when the main power supply fails, thereby maintaining the normal operation of the system.

[0003] Most of the existing power conversion switches use simple electrical control structure, which can automatically switch to standby power supply when the main power supply fails. However, these existing technologies still have the following disadvantages in actual use:

[0004] The wiring of the traditional power conversion system is complex, and the electrical connection between the modules needs to bypass the functional modules in the shell, which is easy to cause messy wiring and difficult to maintain. The connection of the traditional dual power conversion system and the main power supply / standby power supply often needs separate power supply interface and control signal interface, which has many interfaces, and the wiring is difficult to concentrate and maintain.

[0005] When the user's main power supply is powered off or restored, and the generator is used as a standby power supply, manual triggering is usually needed to start and shut down the generator operation. The manual control method has a response delay, not only increases the power supply recovery time after power failure, but also significantly reduces the reliability and efficiency of power supply in frequent power switching scenarios.

[0006] Further, when the generator is used as a standby power supply, the starting battery of the generator is the key backup power source for ignition. However, the existing dual power conversion switch system does not have the function of intelligent charging management for the starting battery of the generator, which may affect the service life of the battery due to overcharging or undercharging. The traditional battery charging system is usually a fixed voltage or current charging mode, which lacks the intelligent adjustment function of constant voltage and constant current, and cannot dynamically adjust the charging process according to the actual voltage of the battery, reducing the charging efficiency and service life of the battery. UTILITY MODEL CONTENTS

[0007] In view of the deficiencies in the prior art, the utility model provides a dual power conversion switch system, which mainly solves the following problems: simplifying the installation and wiring of the conversion switch system, and effectively managing the starting battery of the generator.

[0008] To achieve the above purpose, the utility model adopts the following technical scheme:

[0009] A dual power transfer switch system, comprising a housing, a generator power supply connection port, a generator signal composite interface, a mains connection port and a user interaction module are assembled on the housing; a plurality of functional modules are arranged in the housing, the functional modules include a dual power automatic transfer switch, a charging controller, a power state monitoring module, a micro control unit and a power input switch;

[0010] The generator power supply connection port and the mains connection port are electrically connected with the input end of the charging controller, the input end of the power state monitoring module and the input end of the dual power automatic transfer switch through the power input switch;

[0011] The power state monitoring module is used for detecting the power frequency and voltage state and feeding back to the micro control unit;

[0012] One of the outputs of the micro control unit is connected with the control signal interface of the dual power automatic transfer switch, which is used for monitoring the power frequency / voltage abnormity in real time in the automatic power transfer mode and triggering the control of the dual power automatic transfer switch;

[0013] The control end of the dual power automatic transfer switch is electrically connected with the generator signal composite interface, which is used for outputting the signal to start or stop the generator; the output end of the dual power automatic transfer switch is connected with the user load;

[0014] The output end of the charging controller is connected with the generator signal composite interface, which is used for providing the charging for the starting storage battery of the generator through the generator signal composite interface; the charging controller is in communication connection with the micro control unit to feed back the generator storage battery state and receive the control signal;

[0015] The user interaction module is in communication connection with the micro control unit.

[0016] Further, a plurality of functional module slots and mounting hole positions are arranged in the housing, which are used for mounting and fixing the functional modules;

[0017] At least four fixing holes are arranged on the four corners of the housing, which are used for fixing the housing;

[0018] The generator power supply connection port and the mains connection port are arranged on the side of the housing close to the power input switch;

[0019] At least one threading hole is arranged on the side of the housing close to the transfer switch, which is used for connecting the user load.

[0020] Further, the generator signal composite interface integrates the charging terminal, the control signal terminal and the anti-reverse connection module;

[0021] The generator signal composite interface is arranged on the side wall of the shell close to the charging controller, a charging terminal of the generator signal composite interface is connected with the charging controller, and a control signal terminal is connected with the double power automatic transfer switch;

[0022] The anti-reverse connection module is located between the charging terminal and the charging controller, and is used for preventing external misconnection current from flowing back.

[0023] Further, the charging controller comprises a charging module and a short-circuit protection module; input ends of the charging module are connected with input ends of the charging controller to receive power input, a control end of the charging module is connected with an output pin of the micro control unit to receive a control signal and switch a charging mode, and an output end of the charging module is connected with the generator.

[0024] An input end of the short-circuit protection module is connected with an output end of the charging module, a control end of the short-circuit protection module is connected with an input pin of the micro control unit to feed back an interrupt signal, and an output end of the short-circuit protection module is connected with an output end of the charging controller.

[0025] Preferably, the charging module comprises a rectifier filter circuit, a battery voltage detection module, a current detection module, a PWM control circuit and an IGBT.

[0026] An input end of the rectifier filter circuit is connected with an input end of the charging controller, the rectifier filter circuit receives an alternating current signal output by a power supply and converts the alternating current signal into a relatively stable direct current signal output to a collector of the IGBT.

[0027] An emitter of the IGBT is connected with an input end of the current detection module.

[0028] A detection end of the battery voltage detection module is connected between positive and negative poles of a generator starting battery to detect a voltage of the generator starting battery, and a feedback end of the battery voltage detection module is connected with an input pin of the micro control unit to transmit voltage information.

[0029] A feedback end of the current detection module is connected with an input pin of the micro control unit to transmit current information, and an output end of the current detection module is connected with an output end of the charging module.

[0030] An input end of the PWM control circuit is connected with a group of pins of the micro control unit to adjust a PWM signal, and an output end of the PWM control circuit is connected with a gate of the IGBT, so that the IGBT switching frequency and duty cycle are controlled through the pulse width modulation signal, and constant output current or voltage is maintained.

[0031] Beneficial effects: the utility model can monitor power frequency / voltage abnormity in real time under the automatic power conversion mode, the starting and closing of the generator are controlled through the micro control unit, and the reliability and efficiency of power supply are improved.

[0032] The generator signal composite interface integrates the charging port of the generator starting storage battery and the generator control signal port in a single interface, has double channels of charging and signal control, improves the safety of connection by using the anti-reverse connection module; charging and control signal transmission of the generator are realized through a single port, wiring design of the shell is simplified, installation complexity is reduced and system stability is improved;

[0033] The charging controller has constant voltage and constant current charging characteristics, real-time monitoring of the storage battery voltage and current during the charging process, adjustment of the PWM signal by the micro control unit, dynamic adjustment of the charging mode (constant current and constant voltage charging), effective prevention of overcharging and undercharging, improvement of the storage battery charging efficiency and prolongation of the service life of the storage battery. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is a shell structure diagram of one embodiment of the utility model;

[0035] Figure 2 It is a switch system structure diagram of one embodiment of the utility model;

[0036] Figure 3 It is a shell bottom structure diagram of one embodiment of the utility model;

[0037] Figure 4 It is a shell surface structure diagram of one embodiment of the utility model.

[0038] In the above drawings:

[0039] 1, shell; 2, generator power connection port; 3, generator signal composite interface; 4, mains connection port; 5, user interaction module; 6, dual power automatic transfer switch; 7, charging controller; 8, power state monitoring module; 9, micro control unit; 10, power input switch; 11, function module slot; 12, mounting hole; 13, fixing hole; 14, threading hole; 15, frequency detection module; 16, voltage detection module; 17, status indicator light; 18, knob; 19, switch dial. DETAILED DESCRIPTION

[0040] The embodiments of the present application are described below in detail, examples of which are shown in the drawings, the example embodiments can be implemented in various forms, and should not be understood as being limited to the examples set forth herein; on the contrary, these embodiments are provided so that the present application will be more comprehensive and complete, and the concepts of the example embodiments will be fully conveyed to those skilled in the art. In the description of the present application, it should be noted that unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] The shell structure of the utility model embodiment is as shown in Figure 1 The switch system structure diagram is as shown in Figure 2 It comprises a shell 1, the shell 1 is assembled with generator power supply connection port 2, generator signal composite interface 3, mains connection port 4 and user interaction module 5;The shell 1 is equipped with multiple functional modules, and the functional modules include double power automatic transfer switch 6, charging controller 7, power state monitoring module 8, micro control unit 9 and power input switch 10;

[0042] The generator power supply connection port 2, mains connection port 4 are electrically connected with the input end of charging controller 7, the input end of power state monitoring module 8 and the input end of double power automatic transfer switch 6 through power input switch 10;Power state monitoring module 8 is used to detect power frequency and voltage state, and feedback to micro control unit 9;One of the outputs of micro control unit 9 is connected with the control signal interface of double power automatic transfer switch 6, for real-time monitoring of power frequency / voltage abnormality in automatic power transfer mode, and triggering double power automatic transfer switch 6;

[0043] The control end of double power automatic transfer switch 6 is electrically connected with generator signal composite interface 3, for output signal to start or shut down the generator;The output end of double power automatic transfer switch 6 is connected with user load;

[0044] The output end of charging controller 7 is connected with generator signal composite interface 3, for providing charging for the starting battery of the generator through generator signal composite interface 3;Charging controller 7 is in communication connection with micro control unit 9, to feedback generator battery state and receive control signal;User interaction module 5 is in communication connection with micro control unit 9.

[0045] Multiple functional module slots 11 and mounting hole positions 12 are provided in the shell 1, for mounting and fixing functional modules;

[0046] As Figure 3 The bottom structure of the shell is shown in the figure, the bottom of the shell 1 is provided with at least four fixing holes 13 evenly distributed on the four corners of the shell 1 for fixing the shell 1;

[0047] The generator power supply connection port 2 and the commercial power supply connection port 4 are arranged on the side of the shell 1 close to the power input switch 10.

[0048] The side of the shell 1 close to the dual power automatic transfer switch 6 is provided with three wire holes 14 for connecting different user loads through wires.

[0049] The generator signal composite interface 3 integrates a charging terminal, a control signal terminal and an anti-reverse connection module.

[0050] The generator signal composite interface 3 is arranged on the side wall of the shell 1 close to the charging controller 7, the charging terminal of the generator signal composite interface 3 is connected with the charging controller 7, the control signal terminal is connected with the dual power automatic transfer switch 6, and the anti-reverse connection module is located between the charging terminal and the charging controller 7 for preventing external misconnection current backflow.

[0051] In the embodiment, the charging port of the generator starting battery and the generator control signal port are integrated in a single interface, the generator signal composite interface 3 has a charging and signal control double channel, and the safety of connection is improved by using the anti-reverse connection module; the charging and control signal transmission of the generator are realized through a single port, the wiring design of the shell 1 is simplified, the installation complexity is reduced, and the system stability is improved.

[0052] The charging controller 7 in the embodiment includes a charging module and a short-circuit protection module; the input end of the charging module is connected with the input end of the charging controller 7 to receive power input, the control end of the charging module is connected with the output pin of the micro control unit 9 to receive a control signal and switch a charging mode, and the output end of the charging module is connected with the generator and starts the generator battery.

[0053] The input end of the short-circuit protection module is connected with the output end of the charging module, the control end of the short-circuit protection module is connected with an input pin of the micro control unit 9 to feed back an interrupt signal, and the output end of the short-circuit protection module is connected with the output end of the charging controller 7.

[0054] The charging module in this embodiment includes a rectifier filter circuit, a battery voltage detection module, a current detection module, a PWM control circuit, and an IGBT. The input end of the rectifier filter circuit serves as the input end of the charging controller 7. The rectifier filter circuit receives an alternating current signal output by a power supply and converts it into a relatively stable direct current signal output to the collector of the IGBT. The emitter of the IGBT is connected to the input end of the current detection module. The detection end of the battery voltage detection module is connected across the positive and negative terminals of the generator starting battery for detecting the voltage of the generator starting battery. The feedback end of the battery voltage detection module is connected to an input pin of the micro control unit 9 for transmitting voltage information.

[0055] The feedback end of the current detection module is connected to an input pin of the micro control unit 9 for transmitting current information. The output end of the current detection module serves as the output end of the charging module.

[0056] The input end of the PWM control circuit is connected to a group of pins of the micro control unit 9 for adjusting the PWM signal. The output end of the PWM control circuit is connected to the gate of the IGBT for controlling the switching frequency and duty cycle of the IGBT through the pulse width modulation signal to maintain a constant output current or voltage.

[0057] The working mode of the charging controller 7 is as follows: when the battery voltage is low, the system works in constant current mode. At this time, the controller determines, according to the feedback signal of the voltage detection module, that the battery voltage is within a range lower than the set value, adjusts the switching state of the MOSFET through the PWM control circuit, and keeps the output current constant. The current detection module continuously monitors the output current through a current sampling resistor and feeds back the detection signal to the charging controller 7. If the actual current deviates from the set value, the charging controller 7 adjusts the PWM signal to recalibrate the output current.

[0058] When the battery voltage is detected to rise to a set threshold value, the charging controller 7 switches to constant voltage mode, in which the PWM control circuit adjusts the on-time of the MOSFET to ensure that the output voltage is constant, while the current gradually decreases.

[0059] As the battery voltage gradually approaches the full charge state, the charging current gradually decreases to trickle charging, ensuring that the battery will not be overcharged.

[0060] At the same time, the overcurrent and overvoltage protection module continuously monitors the current and voltage state during the charging process. Once an abnormality is detected, the system will immediately cut off the charging circuit to ensure safety. In this embodiment, by dynamically adjusting the charging mode, overcharging and undercharging phenomena are effectively prevented, the charging efficiency of the battery is improved, and the service life of the battery is prolonged.

[0061] In this embodiment, the power state monitoring module 8 is composed of a frequency detection module 15 and a voltage detection module 16, and the dual power supply transfer switch system includes a manual mode and an automatic mode. In the automatic mode, the micro control unit 9 continuously detects the power voltage / frequency signal fed back by the power state monitoring module 8, and triggers the switch switching or fault interruption alarm when the power frequency exceeds 20% of the rated frequency or the power voltage exceeds 10% of the rated voltage.

[0062] As shown in Figure 2 The bottom of the shell 1 is provided with four fixing holes 11 evenly distributed on the four corners of the shell 1. The side of the shell 1 close to the power input switch 10 is provided with a wire hole 14 and a connector 14 for connecting the mains input. The wire hole 14 is used to connect the mains input through a wire, and the connector 14 is used to connect the output end of the generator. The side of the shell 1 close to the transfer switch 2 is provided with three wire holes 14 for leading out the output wires to connect the user load.

[0063] As shown in Figure 4 The surface structure diagram of the shell of this embodiment is shown. The user interaction module 5 is arranged on the surface of the shell 1 and includes four state indicator lights 17 for displaying the normal indication of the generator power supply, the normal indication of the mains power supply, the normal indication of the load power supply, and the fault alarm, respectively. The user interaction module 5 further includes two knobs 18, which are an automatic / manual power supply transfer mode switching knob and a generator / mains path switching knob, respectively.

[0064] The transfer switch structure in the dual power automatic transfer switch 6 includes a transfer switch dial, a mechanical interlocking device, and an electrical interlocking device. The mechanical interlocking device is mechanically connected with the transfer switch dial for physically isolating another line when switching the power supply. The electrical interlocking device includes two relays, the coils of which are respectively connected to the two output pins of the micro control unit 9 for controlling the power supply on / off, and the input ends of the two relays are respectively used as the input ends of the dual power automatic transfer switch 6, and the output ends of the relays are commonly connected as the output ends of the dual power automatic transfer switch 6.

[0065] The dual power automatic transfer switch 6 is designed with mechanical and electrical interlocking devices, which ensures that when one power supply is connected, the other power supply is locked, and the risk of two power supplies being connected at the same time is eliminated. The mechanical interlocking device ensures that the mains and generator power supply paths cannot be connected at the same time through physical isolation. The electrical interlocking device prevents interference or failure of electrical signals through relay control.

[0066] In the embodiment, the power input switch 10 comprises at least two leakage protection switches for connecting two different power inputs respectively; the input ends of the leakage protection switches are used for different power inputs respectively, the output ends of the leakage protection switches are connected in common as the output end of the power input switch 10, and the switch dial 19 of the power input switch 10 is also arranged on the surface of the shell 1.

[0067] In the embodiment, the control mode of the dual-power transfer switch system can be switched through an automatic / manual power transfer mode switching knob. In the manual mode, the system does not detect the power state, and the user needs to manually switch the power through the transfer switch.

[0068] In the automatic mode, when the system detects that the mains AC voltage / frequency signal is abnormal for more than 5s, the generator is activated to generate power. The system detects the total time of starting the generator for 120s. During this period, if the generator starts successfully, the system waits for 20s for the generator AC voltage / frequency signal to be stable, and then determines that the generator starts successfully, switches the transfer switch to the generator power generation, and continues to wait until the 120s timing is completed. If the voltage / frequency signal is still detected to be abnormal, the fault light is lit and the power input is cut off. If there is no alarm, the normal operation mode is entered and the generator power generation indicator light is lit.

[0069] When the mains AC voltage / frequency signal is detected to be normal for more than 10s, the load output is switched from the generator side to the mains side, and then a timing delay of 20s is performed. If the mains AC voltage / frequency signal is detected to be abnormal during the 20s delay, the timing delay is cancelled and the switch remains in the generator power generation gear. If the mains is normal during the 20s delay, the system sends a stop signal to the generator and activates the mains normal indicator light.

[0070] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the purpose and scope of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A dual power transfer switch system, characterized by, The shell is provided with a generator power supply connection port, a generator signal composite interface, a commercial power connection port and a user interaction module; a plurality of functional modules are arranged in the shell, and the functional modules include a dual power automatic transfer switch, a charging controller, a power state monitoring module, a micro control unit and a power input switch; The generator power supply connection port and the commercial power connection port are electrically connected with the input end of the charging controller, the input end of the power state monitoring module and the input end of the dual power automatic transfer switch through the power input switch; The power state monitoring module is used for detecting the power frequency and voltage state and feeding back to the micro control unit; One output of the micro control unit is connected with a control signal interface of the dual power automatic transfer switch, and is used for monitoring the power frequency / voltage abnormity in real time and triggering the control of the dual power automatic transfer switch in the automatic power transfer mode; The control end of the dual power automatic transfer switch is electrically connected with the generator signal composite interface, and is used for outputting a signal to start or stop the generator; and the output end of the dual power automatic transfer switch is connected with a user load; The output end of the charging controller is connected with the generator signal composite interface, and is used for charging a starting storage battery of the generator through the generator signal composite interface; the charging controller is in communication connection with the micro control unit, so as to feed back the generator storage battery state and receive a control signal; The user interaction module is in communication connection with the micro control unit.

2. A dual power transfer switch system according to claim 1, wherein, A plurality of functional module slots and mounting holes are arranged in the shell, and are used for mounting and fixing the functional modules; At least four fixing holes are arranged on the bottom of the shell and are uniformly distributed on four corners of the shell, and are used for fixing the shell; The generator power supply connection port and the commercial power connection port are arranged on one side of the shell close to the power input switch; At least one threading hole is arranged on one side of the shell close to the transfer switch, and is used for connecting the user load.

3. A dual power transfer switch system according to claim 2, wherein, The generator signal composite interface integrates a charging terminal, a control signal terminal and an anti-reverse connection module; The generator signal composite interface is arranged on a side wall of the shell close to the charging controller, the charging terminal of the generator signal composite interface is connected with the charging controller, and the control signal terminal is connected with the dual power automatic transfer switch; The anti-reverse connection module is located between the charging terminal and the charging controller.

4. A dual power transfer switch system according to claim 1, wherein, The charging controller includes a charging module and a short circuit protection module; The input end of the charging module is connected with the input end of the charging controller to receive power input, the control end of the charging module is connected with an output pin of the micro control unit to receive a control signal and switch a charging mode, and the output end of the charging module is connected with the generator; The input end of the short circuit protection module is connected with the output end of the charging module, the control end of the short circuit protection module is connected with an input pin of the micro control unit to feed back an interruption signal, and the output end of the short circuit protection module is connected with the output end of the charging controller.

5. A dual power transfer switch system according to claim 4, wherein, The charging module includes a rectifier filter circuit, a storage battery voltage detection module, a current detection module, a PWM control circuit and an IGBT; The input end of the rectifier filter circuit is connected with the input end of the charging controller, and the output end of the rectifier filter circuit is connected with the collector of the IGBT. The emitter of the IGBT is connected to the input of the current detection module; The detection end of the battery voltage detection module is connected to the positive and negative poles of the generator starting battery, and the feedback end of the battery voltage detection module is connected to an input pin of the micro control unit for transmitting voltage information; The feedback end of the current detection module is connected to an input pin of the micro control unit for transmitting current information, and the output end of the current detection module serves as the output end of the charging module; The input end of the PWM control circuit is connected to a group of pins of the micro control unit for adjusting the PWM signal, and the output end of the PWM control circuit is connected to the gate of the IGBT.

6. A dual power transfer switch system according to claim 1, wherein, The power state monitoring module comprises a frequency detection module and a voltage detection module; The input end of the frequency detection module and the input end of the voltage detection module are connected in common as the input end of the power state monitoring module; The output end of the frequency detection module is connected to an input pin of the micro control unit for feeding back the power frequency information; The output end of the voltage detection module is connected to an input pin of the micro control unit for feeding back the power voltage information.

7. A dual power transfer switch system according to claim 1, wherein, The user interaction module comprises an input module and a display module; The display module comprises one or more of an LED display screen, an indicator light and a buzzer; The input module comprises one or more of a switch, a touch screen and a knob.

Images