CN215010104U

CN215010104U - Control device for frequency conversion all-in-one machine and frequency conversion all-in-one machine

Info

Publication number: CN215010104U
Application number: CN202120327974.6U
Authority: CN
Inventors: 钟军伟; 付会彬; 侯旭岐
Original assignee: Qingdao CCS Electric Corp
Current assignee: Qingdao CCS Electric Corp
Priority date: 2021-02-04
Filing date: 2021-02-04
Publication date: 2021-12-03
Anticipated expiration: 2031-02-04

Abstract

The utility model discloses a controlling means and frequency conversion all-in-one machine for frequency conversion all-in-one machine, wherein controlling means includes DC power and control system. The DC/DC power supply is connected to a direct current bus of the frequency converter and is used for converting direct current voltage on the direct current bus into control working voltage; the control system is connected with the DC/DC power supply and is used for operating under the driving of the control operating voltage so as to execute the control operation of the frequency converter. In this way, the utility model discloses a frequency conversion all-in-one need not additionally to set up a plurality of low pressure return circuits, just can directly supply power for control system, thereby has reduced effectively the circuit complexity of frequency conversion all-in-one.

Description

Control device for frequency conversion all-in-one machine and frequency conversion all-in-one machine

Technical Field

The utility model relates to a frequency conversion field. More specifically, the utility model relates to a controlling means and frequency conversion all-in-one machine for frequency conversion all-in-one machine.

Background

When a variable frequency integrated machine control system is powered, a transformer is generally used to change high-voltage alternating current into low-voltage alternating current of 220V for example. The low voltage ac power can then be converted to low voltage dc power using a dc switching power supply to power the control system. However, this power supply method requires an additional transformer or a low-voltage circuit added to the transformer, which results in an increase in the cost of the inverter, and also results in an increase in the volume of the power supply circuit, thereby reducing the integration level of the device.

SUMMERY OF THE UTILITY MODEL

In view of the problem mentioned in the above-mentioned background art, the utility model provides a controlling means and frequency conversion all-in-one for frequency conversion all-in-one to solve prior art and need additionally install the problem of a plurality of low pressure return circuits or transformer when supplying power for control system.

Specifically, for solving the technical problem, in one aspect, the utility model provides a controlling means for frequency conversion all-in-one. The frequency conversion all-in-one machine can comprise a motor and a frequency converter. The control device may include: a DC/DC power supply connected with a direct current bus of the frequency converter and used for converting direct current voltage on the direct current bus into control working voltage; and a control system connected to the DC/DC power supply and configured to operate under the driving of the control operating voltage so as to perform a control operation of the inverter.

In one embodiment, the control system is configured to control an operating state of the frequency converter.

In another embodiment, the DC/DC power supply is a buck converter, a boost converter, or a Flyback converter.

In another embodiment, the DC/DC power supply comprises a starting loop, a control vibration chip, a buffer loop, a switch tube and a pulse compiler which are connected in sequence.

In one embodiment, the control operating voltage is greater than or equal to 3V and less than or equal to 7V.

In another embodiment, the control operating voltage is 5V.

In order to solve the technical problem, in another aspect, the utility model also provides a frequency conversion all-in-one machine, it includes motor, converter and foretell controlling means. The frequency converter comprises an inverter which is connected with the motor and is used for outputting multiphase alternating current with adjustable frequency to the motor so as to drive the motor to work.

In one embodiment, the control system is further configured to control the switching on and off of the inverter to control the operation of the motor.

In another embodiment, the frequency converter further comprises a heating assembly arranged inside the frequency converter for heating an inner cavity of the frequency converter. The heating assembly includes: the temperature control switch is connected with the DC/DC power supply, and the heater is connected with the temperature control switch, wherein the heater is used for heating, and the temperature control switch is used for monitoring the heating temperature of the heater and disconnecting the temperature control switch when the heating temperature reaches a preset threshold value.

In yet another embodiment, the control system is configured to control operation of the heating assembly.

The utility model discloses a temperature control device for converter can be directly be connected with the direct current generating line of converter through setting up DC power, and then converts the direct current voltage on the direct current generating line into heating operating voltage to supply power for heating element. The utility model discloses a temperature control device can make heating element directly drive through the voltage that DC/DC power exported, and need not additionally to set up a plurality of low-voltage return circuits or transformer etc. and come the switching voltage. Specifically, it can directly get the electricity from the direct current bus that supplies power for the frequency conversion all-in-one machine, and need not through other subassembly to reduce the complexity of whole frequency conversion all-in-one machine circuit effectively, made the cost reduction and the volume of frequency conversion all-in-one machine littleer simultaneously.

Drawings

The above and other objects, features and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. In the accompanying drawings, several embodiments of the present invention are illustrated by way of example and not by way of limitation, and like reference numerals designate like or corresponding parts, in which:

fig. 1 is a schematic structural diagram showing a control device according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram showing a first embodiment of the variable frequency all-in-one machine according to the invention;

fig. 3 is a schematic structural diagram showing a second embodiment of the variable frequency all-in-one machine according to the invention;

fig. 4 is a schematic structural diagram showing a third embodiment of the variable frequency all-in-one machine according to the invention;

fig. 5 is a schematic structural diagram showing a fourth embodiment of the variable frequency all-in-one machine according to the invention;

fig. 6 is a schematic structural view showing a heater according to an embodiment of the present invention; and

fig. 7 is a schematic diagram illustrating a structure of a DC/DC power supply according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram illustrating a control device according to an embodiment of the present invention. Fig. 2 is a schematic structural diagram showing a first embodiment of the variable frequency all-in-one machine according to the utility model. Fig. 3 is a schematic structural diagram showing a second embodiment of the frequency conversion all-in-one machine according to the utility model. It should be noted that, in order to facilitate clear description of the circuit of the present invention, the drawings of the present invention are mainly drawn to show the hierarchical relationship between the circuits, and the actual arrangement or position relationship of the components or modules is not affected or limited by the position of the shown circuit block diagram.

As shown in fig. 1, fig. 2 and fig. 3, the present invention provides a control device 10, wherein the control device 10 can be applied to a frequency conversion integrated machine 1, and the frequency conversion integrated machine 1 can include a motor 20 and a frequency converter 30.

Further, according to the difference of application scenario, the utility model discloses a frequency conversion all-in-one 1 can include integrated converter 30 and motor 20, and wherein converter 30 specifically can arrange in the upper portion of motor 20 to be used for providing the changeable alternating current of frequency to motor 20. In some application scenarios, the aforementioned frequency converter 30 may include a rectifying unit or a rectifying circuit, a dc loop, an inverting unit or an inverter. The rectifying unit or the rectifying circuit is used for converting alternating current into direct current. The direct current loop comprises a direct current bus and an energy storage capacitor and is used for buffering and storing the direct current output by the rectifying unit. The inverter unit is used for converting the direct current processed by the direct current loop into alternating current with different frequencies so as to drive a motor to rotate.

In one embodiment, the convertible all-in-one machine 1 may further include an ac transformer, so as to convert the ac power of high voltage into ac power of low voltage, and output it to the inverter 30 to form ac power of a frequency required by the motor 20.

As shown in fig. 1, the control device 10 of the present invention may include a DC/DC power supply 200 and a control system 600. The DC/DC power supply 200 may be directly connected to the DC bus of the frequency converter 30, and may be configured to convert the DC voltage on the DC bus into a control operating voltage. Alternatively, because the DC/DC power supply 200 is small, it can directly convert a relatively high-voltage power frequency DC voltage into a relatively low-voltage control operating voltage.

Alternatively, the DC/DC power supply 200 may be a related chip power supply, which may be a power supply with a smaller volume and lower cost, and may be directly attached to the PCB board of the convertible frequency all-in-one machine 1 or other positions. Therefore, the size of the whole frequency conversion integrated machine 1 is not occupied. The chip power supply comprises a control chip, and for example, a current type PWM control chip can be used for forming a single-ended flyback switching voltage-stabilized power supply circuit. The power supply circuit has a plurality of advantages as follows: 1) the voltage regulation rate is good: the change of the input voltage immediately causes the change of the inductive current, and the change of the inductive current is immediately reflected to the current control loop to be restrained, so that the quick response is achieved. If the change of the input voltage is continuous, the voltage feedback loop also acts, so that a higher linear adjustment rate can be achieved; secondly, the power supply has good load regulation rate: the voltage error amplifier can be specially used for controlling the duty ratio so as to adapt to the change of the output voltage caused by the change of the load, thereby greatly improving the load regulation rate; again the power supply has strong stability: the current control double closed-loop system is an unconditional first-order stable system and has good system stability. The power supply circuit is also suitable for multiple groups of outputs and can be used as an auxiliary power supply of the IGBT frequency converter driving circuit.

Further, the control system 600 is directly connected to the DC/DC power supply 200 for receiving the control operation voltage and operating under the driving thereof, so that the control operation of the frequency converter 30 can be performed. Specifically, the control system 600 may control the operating state of the frequency converter 30, for example, may control the on or off of the IGBT module in the frequency converter 30 and control the on or off of the precharge circuit, which is not limited herein. In an optional embodiment, the control system 600 may also be used to control the working states of other components and devices of the frequency conversion all-in-one machine 1, and the like, which is not described herein again.

In the above embodiment, the DC/DC power supply 200 may be arranged to directly convert the voltage of the DC bus of the frequency converter 30 into the control operating voltage, so as to supply power to the control system 600. The control device can enable the control system 600 to be directly driven by the voltage output by the DC/DC power supply 200 without additionally providing a plurality of low-voltage loops or transformers to convert the voltage. Specifically, the control device can directly get electricity from the direct current bus without other components, so that the complexity of the circuit of the whole frequency conversion all-in-one machine 1 is effectively reduced, and meanwhile, the cost of the frequency conversion all-in-one machine is reduced and the size of the frequency conversion all-in-one machine is smaller. In an alternative embodiment, the operating voltage is controlled to be greater than or equal to 3V and less than or equal to 7V. For example, the voltage may be 3V, 4V, 5V, 7V, etc., but is not limited thereto. Alternatively, the control operating voltage may be specifically 5V.

In alternative embodiments, the DC/DC power supply 200 may be embodied as a buck converter, a boost converter, or a Flyback converter, which is not limited herein.

In an alternative embodiment, the DC/DC power supply 200 is embodied as an isolated power supply. Alternatively, the DC/DC power supply 200 may be other commercially available DC/DC power supplies, and is not limited herein.

Fig. 4 is a schematic structural diagram showing a third embodiment of the variable frequency all-in-one machine according to the utility model.

As shown in fig. 4, the frequency converter 30 may include an inverter 400, and the inverter 400 may be used for connecting with the motor 20 to output a multi-phase alternating current with adjustable frequency to the motor 20, so as to effectively drive the motor 20 to operate. In an alternative embodiment, the control system 600 may also be used to control the switching on and off of the inverter 400, thereby facilitating control of the operation of the motor 20.

Fig. 5 is a schematic structural diagram showing a fourth embodiment of the frequency conversion all-in-one machine according to the utility model. In an alternative embodiment, as shown in fig. 5, the control system 600 may further control the operation of the heating assembly 300. In view of this, the integrated frequency conversion machine 1 further includes a heating component 300, which may be disposed inside the frequency converter 30, and the heating component 300 is directly connected to the DC/DC power supply 200, and is configured to receive the heating operating voltage, operate under the driving of the heating operating voltage, and heat the internal cavity of the frequency converter 30.

Further, the heating assembly 300 includes a temperature control switch 310 connected to the DC/DC power supply 200 and a heater 320 connected to the temperature control switch 310, wherein the temperature control switch 310 is configured to monitor a heating temperature of the heater 320 and is turned off when the heating temperature reaches a preset threshold.

Alternatively, the temperature controlled switch 310 may be embodied as a switch of model CM-tcs.11s, which may be used to monitor the heating temperature of the heater 320. Alternatively, the heating temperature may be a body temperature of the heater 320 when heating, or an ambient temperature of the heater 320 when heating a certain area, which is not limited herein. Alternatively, when the monitored heating temperature is greater than a preset threshold, the temperature control switch 310 is turned off, so that the heater 320 stops operating.

In alternative embodiments, the number of the heaters 320 may be at least two, specifically two, three or more, which is not limited herein.

Fig. 6 is a schematic structural view illustrating a heater according to an embodiment of the present invention.

As shown in fig. 6, the heater 320 includes a heating element 321 and a fan 322, the fan 322 is used for providing an air flow, and the heating element 321 is used for heating the air flow to form a hot air flow so as to dehumidify the convertible frequency all-in-one machine 1.

In a specific application scenario, the internal cavity of the frequency converter 30 may affect the performance of other electronic devices disposed in the internal cavity due to low temperature or environmental moisture, for example, internal rusting or direct contact of the circuit with water may cause short circuit. Based on this, a heater 320 needs to be provided, and a wind flow is formed by a fan 322. Alternatively, the fan 322 may be an axial flow fan, which arranges the heating element 321 in the path of the wind flow, and the wind flow is heated when flowing through the heating element 321, so as to form a hot wind flow, thereby dehumidifying and heating the frequency converter 30.

Alternatively, both the heating element 321 and the fan 322 may be powered by a heating operating voltage.

In an alternative embodiment, the heating operating voltage and the control operating voltage may be the same voltage or different voltages, which is not limited herein.

Fig. 7 is a schematic diagram illustrating a structure of a DC/DC power supply 200 according to an embodiment of the present invention.

As shown in fig. 7, the DC/DC power supply 200 further includes a start-up circuit 210, a control vibration chip 220, a buffer circuit 230, a switch tube 240 and a pulse compiler 250, which are connected in sequence. As can be appreciated by those skilled in the art, the basic principle of the DC/DC power supply 200 is the prior art and will not be described herein.

The dither control chip 220 may be a current-mode PWM control chip, which integrates an oscillator, a deviation voltage amplifier, a current detection comparator, a PWM latch, and an input voltage and 5V reference voltage under-voltage locking circuit. Bipolar transistors and MOSFETs can be driven directly.

The current mode PWM control chip may include 8 pins. Pin 1 is a voltage feedback terminal that is compared to a 2.5V reference voltage inside the chip to generate an error voltage. The voltage loop may be constructed using an internal offset voltage amplifier. Pin 2 is the current feedback end, and the current sample voltage is imported to the current detection comparator by pin 3, and whether the switch tube is output through the overcurrent can be detected through a detection resistance, and the PWM latch resets when the voltage of pin 2 rises to above 1V, and the output end is closed until the next clock sets the PWM latch. A current loop can be formed using pin 3 and a current comparator. Pin 3 is a compensation terminal that is externally connected to a resistor-capacitor element to compensate for the frequency response of the error amplifier. Pin 4 is externally connected to RT/CT to determine the frequency of the oscillator. Pin 5 is an internally generated 5V reference voltage. The pin 6 is a push-pull output end and has the current drawing and filling capacity. Pin 7 is a ground terminal. Pin 8 is the active power supply terminal.

In an alternative embodiment, the specific model of the control vibration chip 220 may be UC3844, UC3846, FA13844, etc., which is not limited herein.

In the above description of the present specification, the terms "fixed," "mounted," "connected," or "connected," and the like, are to be construed broadly unless otherwise expressly specified or limited. For example, with the term "coupled", it can be fixedly coupled, detachably coupled, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship. Therefore, unless the specification explicitly defines otherwise, those skilled in the art can understand the specific meaning of the above terms in the present invention according to specific situations.

From the above description of the present specification, those skilled in the art will also understand the terms used below, terms indicating orientation or positional relationship such as "upper", "lower", "front", "rear", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "center", "longitudinal", "lateral", "clockwise" or "counterclockwise" are based on the orientation or positional relationship shown in the drawings of the present specification, it is for the purpose of facilitating the explanation of the invention and simplifying the description, and it is not intended to state or imply that the devices or elements involved must be in the particular orientation described, constructed and operated, therefore, the above terms of orientation or positional relationship should not be interpreted or interpreted as limiting the present invention.

In addition, the terms "first" or "second", etc. used in this specification are used to refer to numbers or ordinal terms for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present specification, "a plurality" means at least two, for example, two, three or more, and the like, unless specifically defined otherwise.

While various embodiments of the present invention have been shown and described herein, it will be obvious to those skilled in the art that such embodiments are provided by way of example only. Numerous modifications, changes, and substitutions will occur to those skilled in the art without departing from the spirit and scope of the present invention. It should be understood that various alternatives to the embodiments of the invention described herein may be employed in practicing the invention. The following claims are intended to define the scope of the invention and, therefore, to cover module compositions, equivalents, or alternatives falling within the scope of these claims.

Claims

1. The utility model provides a controlling means for frequency conversion all-in-one, wherein the frequency conversion all-in-one includes motor and converter, its characterized in that, controlling means includes:

a DC/DC power supply connected to a DC bus of the frequency converter and used for converting a DC voltage on the DC bus into a control working voltage; and

and the control system is connected with the DC/DC power supply and is used for operating under the driving of the control operating voltage so as to execute the control operation of the frequency converter.

2. The control device of claim 1, wherein the control system is configured to control an operating state of the frequency converter.

3. The control device of claim 1, wherein the DC/DC power supply is a buck converter, a boost converter, or a Flyback converter.

4. The control device of claim 1, wherein the DC/DC power supply comprises a start-up loop, a control vibration chip, a buffer loop, a switch tube and a pulse compiler, which are connected in sequence.

5. The control device according to claim 1, wherein the control operating voltage is greater than or equal to 3V and less than or equal to 7V.

6. The control device according to claim 1, wherein the control operating voltage is 5V.

7. A variable frequency all-in-one machine is characterized by comprising a motor, a frequency converter and a control device according to any one of claims 1-6, wherein the frequency converter comprises an inverter which is connected with the motor and is used for outputting multiphase alternating current with adjustable frequency to the motor so as to drive the motor to work.

8. The variable frequency all-in-one machine according to claim 7, wherein the control system is further configured to control the switching on and off of the inverter so as to control the operation of the motor.

9. The variable frequency all-in-one machine according to claim 7, wherein the frequency converter further comprises a heating assembly arranged inside thereof for heating an internal cavity of the frequency converter, wherein the heating assembly comprises:

the temperature control switch is connected with the DC/DC power supply, and the heater is connected with the temperature control switch, wherein the heater is used for heating, and the temperature control switch is used for monitoring the heating temperature of the heater and disconnecting the temperature control switch when the heating temperature reaches a preset threshold value.

10. The variable frequency all-in-one machine according to claim 9, wherein the control system is configured to control the operation of the heating assembly.