CN204721211U - The power supply circuits of inverter and there are its household electrical appliance - Google Patents

Abstract

The utility model discloses a power supply circuit of an inverter power supply and a household appliance with the same. The power supply circuit comprises: a power input module; a rectification module; a first output terminal connected between the first output terminal and the second output terminal of the rectification module; Capacitor, wherein, the maximum value of the pulsation of the voltage across the first capacitor is more than twice the minimum value of the pulsation; an inverter module; a discharge module connected in parallel with the first capacitor, and the discharge module includes first diodes connected in series in sequence , the first resistor and the second capacitor, the anode of the first diode is connected to the first output end of the rectifier module; the second resistor, one end of which is connected to the second node between the first resistor and the second capacitor, and the other end It is connected to the second output terminal of the rectifier module; the anode of the second diode is connected to the second node, so as to absorb the surge energy, suppress the fluctuation of the first capacitor voltage, and provide a stable input voltage for the inverter module, ensuring The stability of the power supply circuit can improve the power factor to more than 97%.

Description

Power supply circuit of inverter power supply and household appliances having same

technical field

The utility model relates to the technical field of power electronics, in particular to a power supply circuit of an inverter power supply and a household appliance with the power supply circuit.

Background technique

In related technologies, the inverter module in the inverter power supply is used to invert the rectified DC bus voltage into AC power to supply power to the load. However, during the working process of the related inverter power supply, when the load changes greatly, the DC bus The voltage will also fluctuate greatly, which may easily cause damage to the inverter power supply, and the stability of the inverter power supply is poor.

Moreover, the DC/DC circuit for low-voltage power supply in the inverter power supply can provide power for the control part. In related technologies, the input end of the DC/DC circuit is usually directly connected to the DC bus, and shares the rectified DC bus voltage with the inverter module. In this way, when the DC bus voltage fluctuates greatly, the input voltage of the DC/DC circuit will directly Fluctuations, the output low pressure also follows the fluctuations, resulting in control confusion.

Therefore, there is a need for improvement in the related art.

Utility model content

The utility model aims to solve one of the technical problems in the related art at least to a certain extent. Therefore, an object of the utility model is to provide a power supply circuit for an inverter power supply, which can suppress the fluctuation of the DC bus voltage and provide a stable input voltage for the DC/DC circuit.

Another purpose of the utility model is to provide a household appliance with the power supply circuit.

In order to achieve the above purpose, a power supply circuit for an inverter power supply proposed by the present utility model includes: a power input module, the power input module is connected to the power supply; a rectification module, the rectification module is connected to the power input module connected, the rectifier module has a first output terminal and a second output terminal; a first capacitor, the first capacitor is connected between the first output terminal and the second output terminal of the rectifier module, wherein the first The pulsating maximum value of the voltage at both ends of a capacitor is more than twice the pulsating minimum value; the inverter module, the inverter module is connected to the first output terminal and the second output terminal of the rectifier module; and the first A discharge module with capacitors connected in parallel, the discharge module includes a first diode, a first resistor and a second capacitor connected in series in sequence, the anode of the first diode is connected to the first output end of the rectifier module connected, wherein, there is a first node between the first diode and the first resistor, and a second node between the first resistor and the second capacitor; the second resistor, the second One end of the resistor is connected to the second node, the other end of the second resistor is connected to the second output end of the rectifier module; a second diode, the anode of the second diode is connected to the first The two nodes are connected.

According to the power supply circuit of the inverter power supply proposed by the utility model, the first capacitor is connected between the first output terminal and the second output terminal of the rectifier module, and a discharge module is connected in parallel at both ends of the first capacitor, and the discharge module includes The first diode, the first resistor and the second capacitor are connected in series in sequence, and one end of the second resistor is connected to the second node between the first resistor and the second capacitor, and the other end of the second resistor is connected to the rectifier module The second output terminal of the second diode is connected, and the anode of the second diode is connected to the second node, so that the surge energy can be absorbed, and the fluctuation of the first capacitor voltage (that is, the DC bus voltage) caused by the surge can be effectively suppressed, ensuring that the first The stability of the capacitor voltage provides a stable input voltage for the inverter module, avoids control confusion or damage of the inverter module due to voltage fluctuations, and ensures the stability of the power supply circuit. Moreover, the maximum value of the ripple of the voltage across the first capacitor is set to be more than twice the minimum value of the ripple, so that the power factor can be improved to more than 97%.

Further, the power input module has a first output terminal and a second output terminal, the rectification module has a first input terminal and a second input terminal, and the power supply circuit further includes: a second input terminal connected to the power input module A PTC protection module between the second output terminal and the second input terminal of the rectification module.

Further, the power supply circuit of the inverter power supply further includes: an inductor connected in series with the PTC protection module for adjusting the power factor of the power supply circuit.

Further, the power supply circuit of the inverter power supply further includes: a DC/DC module, the DC/DC module supplies power to the inverter module, and the first input terminal of the DC/DC module is connected to the second The cathodes of the diodes are connected, and the second input end of the DC/DC module is connected with the second output end of the rectification module.

Further, the cathode of the second diode is also connected to the first node.

Further, the power supply circuit of the inverter power supply further includes: a brake module connected in parallel with the first capacitor, and the brake module is used to absorb the inertial rotation of the motor after the power supply to the motor is stopped. the resulting current.

Specifically, the braking module includes a third resistor and a first switch connected in series.

Further, the power supply circuit of the inverter power supply further includes: a control module, which controls the first switch to be closed after the power supply to the motor is stopped.

In order to achieve the above purpose, another aspect of the utility model proposes a household appliance, comprising: the power supply circuit of the inverter power supply.

According to the household appliance proposed by the utility model, the power supply circuit of the above-mentioned inverter power supply can absorb the surge energy, effectively suppress the fluctuation of the DC bus voltage caused by the surge, and ensure the stability of the DC bus voltage. The inverter module provides a stable input voltage, avoids control confusion or damage of the inverter module due to voltage fluctuations, ensures the stability of the power supply circuit, and can improve the power factor to more than 97%.

Description of drawings

1 is a schematic diagram of a power supply circuit of an inverter power supply according to an embodiment of the present invention;

Fig. 2 is a schematic circuit diagram of a power supply circuit of an inverter power supply according to an embodiment of the present invention; and

Fig. 3 is a schematic circuit diagram of a power supply circuit of an inverter power supply according to another embodiment of the present invention.

Reference signs:

Motor 10, power input module 20, rectifier module 30, first capacitor C1, inverter module 40, power taking module 50, power supply 100, discharge module 60, first resistor R1, second capacitor C2, first diode D1 , second resistor R2 , second diode D2 , DC/DC module 501 , PTC protection module 70 , relay KM1 , inductor L1 , braking module 80 , third resistor R3 , first switch K1 and control module 90 .

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

The following describes the power supply circuit of the inverter power supply provided by the embodiment of the present invention and the household appliance with the power supply circuit with reference to the accompanying drawings.

Fig. 1 is a schematic diagram of a power supply circuit of an inverter power supply according to an embodiment of the present invention. As shown in Figure 1, the power supply circuit of the inverter power supply includes: a power input module 20, a rectification module 30, a first capacitor C1, an inverter module 40, a discharge module 60, a second resistor R2 and a second diode D2 .

Wherein, the power input module 20 is connected with the power source 100 . Wherein, the power supply 100 inputs AC power to the power input module 20, and the power input module 20 is used for filtering the input AC power and outputting the processed AC power. Specifically, the power input module 20 has a first input end and a second input end, the first input end of the power input module 20 is connected to the live line of the power supply 100, and the second input end of the power input module 20 is connected to the neutral line of the power supply 100 connected.

The rectification module 30 is connected to the power input module 20, and the rectification module 30 has a first output terminal and a second output terminal. Wherein, the rectification module 30 is used for rectifying the alternating current output by the power input module 20 and outputting high voltage direct current. Specifically, the rectification module 30 also has a first input terminal and a second input terminal, the first input terminal of the rectification module 30 is connected to the first output terminal of the power input module 20, the second input terminal of the rectification module 30 is connected to the power input module 20 connected to the second output terminal. According to an example of the present invention, the rectification module 30 may include a rectification bridge composed of four diodes.

The first capacitor C1 is connected between the first output end and the second output end of the rectification module 30, that is, one end of the first capacitor C1 is connected to the first output end of the rectification module 30, and the other end of the first capacitor C1 is connected to the first output end of the rectification module 30. between the second output terminals of the rectifier module 30, and one end of the first capacitor C1 can be used as the positive terminal of the DC bus, and the other end of the first capacitor C1 can be used as the negative terminal of the DC bus, wherein the voltage across the first capacitor The pulsating maximum value is more than twice the pulsating minimum value. It should be noted that if the pulsating maximum value of the voltage across the first capacitor is more than twice the pulsating minimum value, then the power factor can be improved to more than 97%.

The inverter module 40 is respectively connected to the first output end and the second output end of the rectification module 30 . Wherein, the inverter module 40 is used to invert the high-voltage direct current into alternating current, and provide it to the motor 10 to control the operation of the motor 10 . Specifically, the inverter module 40 also has a first input end and a second input end, the first input end of the inverter module 40 is connected to the first output end of the rectification module 30, and the second input end of the inverter module 40 is connected to the rectification module 30. The second output terminal of the module 30 is connected, and the first capacitor C1 is connected in parallel between the rectifier module 30 and the inverter module 40, that is, the first capacitor C1 is connected in parallel between the first output terminal and the second output terminal of the rectifier module 30, And also connected in parallel between the first input end and the second input end of the inverter module 40 .

The discharge module 60 is connected in parallel with the first capacitor C1, and the discharge module 60 may be connected in parallel between the rectification module 30 and the first capacitor C1. The discharge module 60 includes a first diode D1, a first resistor R1 and a second capacitor C2 connected in series in sequence. The anode of the first diode D1 is connected to the first output terminal of the rectifier module 30, wherein the first two There is a first node between the pole transistor D1 and the first resistor R1, and there is a second node between the first resistor R1 and the second capacitor C2.

Specifically, in the examples shown in FIGS. 1-3 , the anode of the first diode D1 is connected to the first output end of the rectifier module 30, the cathode of the first diode D1 is connected to one end of the first resistor R1, and the first The other end of the resistor R1 is connected to one end of the second capacitor C2 , and the other end of the second capacitor C2 is connected to the second output end of the rectification module 30 . It should be understood that the connection sequence of the first diode D1, the first resistor R1 and the second capacitor C2 can be changed.

It should be noted that the potential of the first output end of the rectification module 30 is higher than the potential of the second output end of the rectification module 30, that is, the direction from the anode of the first diode D1 toward the cathode is the same as that from the output end of the rectification module 30. The direction from high potential to low potential is the same.

Specifically, in the embodiment of the present utility model, the first resistor R1 is used for current limiting, and by adding the first resistor R1, the current impact on the second capacitor can be reduced when power-on or when there is a surge impact. The first diode D1 is used to isolate the high-voltage part from the low-voltage part, so as to reduce the interaction between high and low voltage.

One end of the second resistor R2 is connected to the second node, and the other end of the second resistor R2 is connected to the second output end of the rectifier module 30, that is, the second resistor R2 is connected in parallel with the second capacitor C2, more specifically, when the second When the second capacitor C2 is an electrolytic capacitor, the positive pole of the second capacitor C2 is connected to the second node, the negative pole of the second capacitor C2 is connected to the second output terminal of the rectifier module 30; the anode of the second diode D2 is connected to the second node .

It should be noted that the second resistor R2 is used for discharging. When the power supply 100 is cut off, the second capacitor C2 is quickly discharged through the second resistor R2, thereby preventing the residual voltage from harming the human body and providing safety guarantee for repair and maintenance. Also, the second diode D2 is used to prevent reverse discharge.

As mentioned above, after the power supply circuit is connected to the power supply 100, the AC current passes through the power input module 20 and the rectification module 30 and is converted into high-voltage direct current (that is, the DC bus voltage), and the high-voltage direct current is then converted into alternating current by the inverter module 40 to provide To the motor 10, to control the operation of the motor 10. Moreover, the first capacitor C1 connected between the rectifier module 30 and the inverter module 40 can smooth and filter the high-voltage direct current to keep the DC bus voltage stable. The module 60 can absorb surge energy, effectively suppress the fluctuation of the first capacitor voltage (that is, the DC bus voltage) caused by the surge, ensure the stability of the first capacitor voltage, provide a stable input voltage for the inverter module, and avoid inverter The control of the module is chaotic or damaged due to voltage fluctuations, ensuring the stability of the power supply circuit.

Further, as shown in Figure 2-3, the power supply circuit of the inverter power supply further includes: a DC/DC module 501, the DC/DC module 501 supplies power to the inverter module 40, the first input terminal of the DC/DC module 501 is connected to the second The cathodes of the two diodes D2 are connected, and the second input end of the DC/DC module 501 is connected with the second output end of the rectification module 30 .

Wherein, as shown in FIG. 3 , the cathode of the second diode D2 can also be connected to the first node. That is to say, the first input end of the DC/DC module 501 can be directly connected to the cathode of the first diode D1. In other words, the cathode of the first diode D1 can be connected to the first input terminal of the DC/DC module 501, thereby reducing the loss of the first resistor when the DC/DC module works normally.

It should be noted that the DC/DC module 501 is used for stepping down the DC voltage. The DC/DC module 501 , the second resistor R2 and the second diode D2 can constitute the power-taking module 50 . Among them, the power-taking module 50 can take stable direct current from the power supply circuit as shown in the voltage of point V2 in Fig. 2-Fig. supply. Specifically, the inverter module 40 may include an inverter bridge and a control circuit for controlling the inverter bridge, and the power-taking module 50 provides stable low-voltage direct current to the control part of the inverter module 40, so as to meet the requirements of the control part. requirements, and avoid control confusion.

Specifically, the second resistor R2 is used for discharging. When the power supply 100 is cut off, the second capacitor C2 is quickly discharged through the second resistor R2, so as to prevent the residual voltage from harming the human body and provide safety guarantee for repair and maintenance. The second diode D2 is used to prevent reverse discharge, and one end of the second capacitor C2 is connected to the first input end of the DC/DC module 501 through the second diode D2, so that by adding the second diode D2, the Ensure the stability of the input voltage of the DC/DC module 501, thereby providing a stable power supply voltage for the inverter module 40, and can isolate the flyback voltage generated during the working process of the DC/DC module 501, so as to prevent the DC/DC module 501 from affecting the first The reverse impact of the second capacitor C2 reduces the influence of the power supply on the input voltage of the DC/DC module 501 (such as the voltage at point V2 in FIGS. 2-3 ). In addition, the first diode D1 can also connect the voltage provided to the inverter module 40 (such as the voltage at point V_P in Fig. 2-Fig. The voltage of the V1 point) to isolate, thereby reducing the mutual influence.

Therefore, the power supply circuit can ensure the stability of the input voltage of the power-taking module 50, thereby providing a stable low-voltage input voltage for the inverter module, and effectively improving the power factor of the power supply.

Further, as shown in FIGS. 2-3 , the power input module 20 has a first output terminal and a second output terminal, the rectifier module 30 has a first input terminal and a second input terminal, and the power supply circuit also includes: PTC (Positive Temperature Coefficient , positive temperature coefficient thermistor) protection module 70 , the PTC protection module 70 is connected between the second output end of the power input module 20 and the second input end of the rectification module 30 .

It should be noted that the PTC protection module is used to prevent power-on impact when the power is turned on.

Specifically, as shown in FIGS. 2-3 , the power supply circuit further includes a relay KM1 , and the switch of the relay KM1 is connected in parallel with the PTC protection module 70 .

Further, according to the embodiment shown in FIGS. 2-3 , the power supply circuit of the inverter power supply further includes: an inductor L1 connected in series with the PTC protection module 70 for adjusting the power factor of the power supply circuit.

In addition, according to the embodiments shown in FIGS. 2-3 , the power supply circuit of the inverter power supply further includes: a braking module 80 . The braking module 80 is connected in parallel with the first capacitor C1, and the braking module 80 is used for absorbing the current generated by the inertial rotation of the motor after the power supply to the motor 10 is stopped.

Specifically, the braking module 80 includes a third resistor R3 and a first switch K1 connected in series. More specifically, the first switch K1 can be a triode, one end of the third resistor R3 is connected to one end of the first capacitor C1, the other end of the third resistor R3 is connected to the collector of the triode, and the emitter of the triode is grounded.

Further, the power supply circuit of the inverter power supply further includes: a control module 90, and the control module 90 controls the first switch K1 to close after the power supply to the motor 10 is stopped. More specifically, the control module 90 is connected to the base of the triode. After the power supply to the motor 10 is stopped, the control module 90 can output a high-level signal to the base of the triode so that the triode is turned on. After the triode is turned on, the brake module 80 Work to absorb the electrical energy generated by the motor due to inertial rotation.

It should be noted that after the motor 10 as a load stops running, the motor 10 will continue to rotate due to inertia, and at this time the motor 10 will be in a power generation state, and the electric energy and peak voltage generated by the motor 10 will be consumed by the brake module 80 , so as to realize the rapid stop of the motor through dynamic braking. Of course, the electric energy generated by the motor 10 can also charge the power supply circuit of the embodiment of the present utility model, and convert it into the power supply of the circuit.

To sum up, according to the power supply circuit of the inverter power supply proposed by the embodiment of the utility model, the first capacitor is connected between the first output terminal and the second output terminal of the rectifier module, and the two ends of the first capacitor are connected in parallel to discharge The discharge module includes a first diode, a first resistor, and a second capacitor connected in series in sequence, and one end of the second resistor is connected to a second node between the first resistor and the second capacitor, and the second The other end of the resistor is connected to the second output end of the rectifier module, and the anode of the second diode is connected to the second node, so as to absorb the surge energy and effectively suppress the voltage of the first capacitor caused by the surge (that is, the DC bus voltage ) fluctuations, to ensure the stability of the first capacitor voltage, to provide a stable input voltage for the inverter module, to avoid control confusion or damage to the inverter module due to voltage fluctuations, and to ensure the stability of the power supply circuit. Moreover, the maximum value of the ripple of the voltage across the first capacitor is set to be more than twice the minimum value of the ripple, so that the power factor can be improved to more than 97%. Moreover, the power supply circuit of the embodiment of the utility model can also ensure the stability of the input voltage of the power-taking module, and then provide a stable power supply voltage for the inverter module, and can absorb the electric energy generated by the reverse rotation of the motor after the motor stops.

Finally, the embodiment of the present utility model also proposes a household appliance, which includes the power supply circuit of the inverter power source of the above embodiment.

According to the household appliance proposed by the embodiment of the utility model, the power supply circuit of the inverter power supply of the above embodiment can absorb the surge energy, effectively suppress the fluctuation of the DC bus voltage caused by the surge, and ensure the stability of the DC bus voltage. Provide a stable input voltage for the inverter module in the power supply circuit, avoid control confusion or damage of the inverter module due to voltage fluctuations, ensure the stability of the power supply circuit, and improve the power factor to more than 97%.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial" The orientation or positional relationship indicated by , "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying the referred device Or elements must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In this utility model, unless otherwise specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrated; may be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediary, and may be an internal communication between two elements or an interactive relationship between two elements, unless otherwise stated Clearly defined. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model according to specific situations.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first feature and the second feature through an intermediary indirect contact. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structures, materials or features are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and should not be construed as limitations of the present invention, and those skilled in the art are within the scope of the present invention. Variations, modifications, substitutions and variations can be made to the above-described embodiments.

Claims (9)

1. power supply circuits for inverter, is characterized in that, comprising:

Power Entry Module, described Power Entry Module is connected with power supply;

Rectification module, described rectification module is connected with described Power Entry Module, and described rectification module has the first output and the second output;

First electric capacity, described first electric capacity is connected between the first output of described rectification module and the second output, and wherein, the pulsation maximum of described first electric capacity both end voltage is more than the twice of pulsation minimum value;

Inversion module, described inversion module is connected with the second output with the first output of described rectification module respectively;

With the module of releasing of described first Capacitance parallel connection, described module of releasing comprises the first diode, the first resistance and second electric capacity of mutually connecting successively, the anode of described first diode is connected with the first output of described rectification module, wherein, between described first diode and described first resistance, there is first node, between described first resistance and described second electric capacity, there is Section Point;

Second resistance, one end of described second resistance is connected with described Section Point, and the other end of described second resistance is connected with the second output of described rectification module; And

Second diode, the anode of described second diode is connected with described Section Point.

2. the power supply circuits of inverter as claimed in claim 1, it is characterized in that, described Power Entry Module has the first output and the second output, and described rectification module has first input end and the second input, and described power supply circuits also comprise:

Be connected to the PTC protection module between the second output of described Power Entry Module and the second input of described rectification module.

3. the power supply circuits of inverter as claimed in claim 2, is characterized in that, also comprise:

The inductance of connecting with described PTC protection module, for adjusting the power factor of described power supply circuits.

4. the power supply circuits of inverter as claimed in claim 1, is characterized in that, also comprise:

DC/DC module, described DC/DC module is that described inversion module is powered, and the first input end of described DC/DC module is connected with the negative electrode of described second diode, and the second input of described DC/DC module is connected with the second output of described rectification module.

5. the power supply circuits of inverter as claimed in claim 1, it is characterized in that, the negative electrode of described second diode is also connected with described first node.

6. the power supply circuits of inverter as claimed in claim 1, is characterized in that, also comprise:

Brake module, described brake module and described first Capacitance parallel connection, described brake module is used for after stopping power supply to motor, absorbs the electric current because described motor inertial rotation produces.

7. the power supply circuits of inverter as claimed in claim 6, is characterized in that, described brake module comprises the 3rd resistance and first switch of series connection mutually.

8. the power supply circuits of inverter as claimed in claim 7, is characterized in that, also comprise:

Control module, described control module, after stopping power supply to described motor, controls described first switch and closes.

9. household electrical appliance, is characterized in that, comprise the power supply circuits of the inverter as described in any one of claim 1-8.