CN214256631U

CN214256631U - Temperature control device for frequency conversion all-in-one machine and frequency conversion all-in-one machine

Info

Publication number: CN214256631U
Application number: CN202120327600.4U
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: 2021-09-21
Anticipated expiration: 2031-02-04

Abstract

The utility model discloses a temperature control device and frequency conversion all-in-one machine for frequency conversion all-in-one machine, wherein this temperature control device includes DC/DC power and heating element. 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 heating working voltage for heating an inner cavity of the frequency converter. The heating assembly is connected with the DC/DC power supply and used for heating an internal cavity of the frequency converter under the driving of the heating working voltage. In this way, the utility model discloses a frequency conversion all-in-one can need not additionally to set up a plurality of low pressure return circuits, just can directly supply power for heating element to the circuit complexity of frequency conversion all-in-one has been reduced effectively.

Description

Temperature 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 temperature control device and frequency conversion all-in-one machine for frequency conversion all-in-one machine.

Background

When the heater in the existing frequency conversion all-in-one machine is powered, the heater is used as auxiliary equipment of the all-in-one machine, the working voltage of the heater is different from that of other equipment of the frequency conversion all-in-one machine, and the relative working voltage is lower. In view of this, a plurality of low voltage circuits or transformers are additionally installed to obtain the operating voltage of the heater. However, such a mounting operation leads to an increase in the size and cost of the entire inverter-integrated machine.

SUMMERY OF THE UTILITY MODEL

The utility model provides a temperature control device 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 additional when supplying power for the heater.

Specifically, for solving the technical problem, in one aspect, the utility model provides a temperature control device for frequency conversion all-in-one. Wherein, the frequency conversion all-in-one includes motor and converter, temperature control device 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 heating working voltage for heating an inner cavity of the frequency converter; and the heating assembly is connected with the DC/DC power supply and is used for heating the internal cavity of the frequency converter under the driving of the heating working voltage.

In one embodiment, the heating assembly includes a temperature controlled switch coupled to the DC/DC power source and a heater coupled to the temperature controlled switch. The heater is used for heating, temperature detect switch is used for monitoring the heating temperature of heater and when heating temperature reaches preset threshold value disconnection. In another embodiment, the number of heaters is at least two.

In yet another embodiment, the heater comprises a heating element and a fan. The fan is used for providing the wind current, and the heating element is used for heating the wind current so as to form the hot wind current and dehumidify the frequency conversion all-in-one machine.

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

In one embodiment, the heating operating voltage is 5V.

In another embodiment, the DC/DC power supply is an isolated power supply.

In order to solve the technical problem, in another aspect, the utility model also provides a frequency conversion all-in-one machine. The frequency conversion all-in-one machine comprises a frequency converter, a motor and the temperature control device.

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 subassemblies to reduce the complexity of whole frequency conversion all-in-one machine circuit effectively, made frequency conversion all-in-one machine cost reduction and the volume 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 view showing a temperature 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 view showing a heater according to an embodiment of the present invention; and

fig. 6 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 temperature control device 10 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, 2 and 3, the present invention provides a temperature control device 10 for a variable frequency all-in-one machine, which may include a DC/DC power supply 200 and a heating assembly 300.

Further, according to the difference of application scenario, the utility model discloses a frequency conversion all-in-one 1 can include integrated converter 20 and motor 30, and wherein converter 20 specifically can arrange in the upper portion of motor 30 for provide the changeable alternating current of frequency to motor 30. In some scenarios, the aforementioned frequency converter 20 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 can further comprise an alternating current transformer, so that the alternating current with high voltage is converted into the alternating current with low voltage and is input into the frequency converter 20 to form the alternating current with the frequency required by the motor 30. The DC/DC power supply 200 may be directly connected to the DC bus of the frequency converter 20, and may be configured to convert a DC voltage output from the DC bus into a heating operating voltage, where the heating voltage may be specifically used to heat an internal cavity of the frequency converter 20. Optionally, the DC/DC power supply 200 is small and can directly convert a relatively high voltage DC voltage to a relatively low voltage heating 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 integrated frequency converter 1 or other positions, or may be directly disposed in the internal cavity of the frequency converter 20. Therefore, the overall size of the variable frequency all-in-one machine 1 is not increased. 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.

The heating assembly 300 is directly connected to the DC/DC power supply 200 for receiving and heating the heating operation voltage, and in particular, it can be used for heating the internal cavity of the frequency converter 20 to ensure that the devices inside the frequency converter 20 can operate normally at low temperature.

In the above embodiment, the DC/DC power supply 200 may be arranged to directly convert the DC voltage on the DC bus of the inverter 20 into the heating operation voltage, so as to supply power to the heating assembly 300. The temperature control device can enable the heating element 300 to be directly driven by the voltage output by the DC/DC power supply 200, and heat the internal cavity of the frequency converter 20, without additionally providing a plurality of low-voltage loops or transformers to convert the voltage. Specifically, the temperature control device 10 can directly get electricity from the direct current bus supplying power to the whole frequency conversion all-in-one machine 1 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 is smaller. 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 heating assembly 300 of the temperature control device of the present invention may include a temperature control switch 310 connected to the DC/DC power supply 200 and a heater 320 connected to the temperature control switch 310. Further, the heater 320 may be used for heating. The temperature control switch 310 is used for monitoring the heating temperature of the heater 320 and switching off the temperature control switch when the heating temperature reaches a preset threshold value.

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 higher than the 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, and is not limited herein.

Fig. 5 is a schematic structural diagram illustrating a heater according to an embodiment of the present invention.

As shown in fig. 5, in an alternative embodiment, the heater 320 may include a heating element 321 and a fan 322, where the fan 322 is configured to provide an air flow, the heating element 321 is configured to heat the air flow to form a hot air flow so as to heat and dehumidify the frequency conversion all-in-one machine 1, and specifically, it may heat and dehumidify an internal cavity of the frequency converter 20, so as to ensure that electronic components in the internal cavity of the frequency converter 20 can operate normally.

In a specific application scenario, the convertible all-in-one machine 1 may affect the working performance thereof due to the damp environment, for example, due to internal rusting or the direct contact of the circuit with water, which may cause short circuit. In addition, it is possible that the electronic components in the internal cavity of the frequency converter 20 of the all-in-one frequency converter cannot normally operate due to low temperature. Based on this, it is necessary to provide the heater 320 in the convertible frequency all-in-one machine, and the fan 322 forms the wind flow, alternatively, the fan 322 may be specifically an axial flow fan, which arranges the heating element 321 on the path of the wind flow, and when the wind flow passes through the heating element 321, the wind flow is heated so as to form the hot wind flow, so that the convertible frequency all-in-one machine 1 can be heated and dehumidified.

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 is greater than or equal to 3V and less than or equal to 7V. Specifically, the voltage may be 3V, 4V, 5V, 7V, etc., but is not limited thereto. Preferably, the heating operation voltage may be 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. Alternatively, the DC/DC power supply 200 may be other commercially available DC/DC power supplies, and is not limited herein. In an alternative embodiment, the DC/DC power supply 200 may also be an isolated power supply.

Fig. 6 shows a schematic structural diagram of a DC/DC power supply according to an embodiment of the present invention.

As shown in fig. 6, the DC/DC power supply 200 may include a start-up loop 210, a control vibration chip 220, a buffer loop 230, a switch tube 240, and a pulse compiler 250, which are connected in sequence. It is understood that the operation principle of the DC/DC power supply 200 is conventional 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 another aspect, the present invention further provides a frequency conversion all-in-one machine 1, wherein the frequency conversion all-in-one machine 1 can include a frequency converter 20 and a motor 30. The frequency converter 20 is used to provide the motor 30 with a driving voltage meeting the requirement. Optionally, the frequency conversion all-in-one machine 1 further includes the temperature control device 10, and the temperature control device 10 may be directly connected to the dc bus of the frequency converter 20.

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 temperature control device for frequency conversion all-in-one, wherein frequency conversion all-in-one includes motor and converter, its characterized in that, temperature control device includes:

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

the heating assembly is connected with the DC/DC power supply and is used for heating the internal cavity of the frequency converter under the driving of the heating working voltage.

2. The temperature control device of claim 1, wherein the heating assembly comprises a temperature control switch connected to the DC/DC power supply and a heater connected to the temperature control switch, wherein the heater is configured to heat, and the temperature control switch is configured to monitor a heating temperature of the heater and to turn off when the heating temperature reaches a preset threshold.

3. The temperature control device of claim 2, wherein there are at least two of said heaters.

4. The temperature control device of claim 2, wherein the heater comprises a heating element and a fan, wherein the fan is configured to provide a flow of air, and wherein the heating element is configured to heat the flow of air to form a flow of hot air to dehumidify the frequency converter.

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

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

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

8. The temperature control device according to claim 7, wherein the heating operation voltage is 5V.

9. The temperature control device of claim 1, wherein the DC/DC power source is an isolated power source.

10. A frequency conversion all-in-one machine comprises a frequency converter and a motor, and is characterized by further comprising a temperature control device according to any one of claims 1-9.