CN204794720U - Invertion power supply's supply circuit and have its domestic 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; inverter module; discharge module, which includes a first diode, a first resistor, and a second capacitor connected in series; a second resistor, one end of which is connected to a second node between the first resistor and the second capacitor Connected, the other end is connected to the second output end of the rectifier module; the third resistor connected between the second resistor and the rectifier module; PTC, one end of which is connected to the other end of the second capacitor, and the other end is connected to one end of the third resistor the second diode, the anode of which is connected to the second node; the first switch connected in parallel with the PTC; the controller connected to the first switch, which is used to control the first switch. Therefore, the first capacitor with a smaller capacitance can be used, and the power-on surge current can be reduced to ensure the reliability of the power supply circuit.

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

A smoothing filter capacitor is usually provided in the power supply circuit of the relevant inverter power supply, and the capacitance of the smoothing filter capacitor is gradually reduced with the advancement of technology. Moreover, in the related art, a relay is usually connected to the AC main loop of the power supply circuit, wherein the relay is closed after the circuit at the output end of the rectifier bridge reaches a stable state. However, when the power supply circuit is working normally, since the load current continues to flow through the relay contacts, it is necessary to use a relay with a larger capacity, which is costly and causes waste of electric energy.

Therefore, related technologies need to be improved.

Contents of the invention

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 present invention is to provide a power supply circuit for an inverter power supply, which can use a smoothing filter capacitor with a small capacitance and effectively reduce costs.

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; the inverter module, the The inverter module is respectively connected to the first output terminal and the second output terminal of the rectification module; the discharge module, 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 terminal of the rectifier module, the cathode of the first diode is connected to one end of the first resistor, and the other end of the first resistor is connected to the One end of the second capacitor is 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 , one end of the second resistor is connected to the second node, and the other end of the second resistor is connected to the second output end of the rectifier module; a third resistor, the third resistor is connected to the first Between the two resistors and the rectifier module, one end of the third resistor is connected to the other end of the second resistor, and the other end of the third resistor is connected to the second output end of the rectifier module; PTC, One end of the PTC is connected to the other end of the second capacitor, the other end of the PTC is connected to one end of the third resistor; a second diode, the anode of the second diode is connected to the The second node is connected; a first switch connected in parallel with the PTC; a controller connected with the first switch, wherein the controller is used to control the first switch.

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 rectification module, and the discharge module includes the first diode and the first resistor connected in series in sequence. and the second capacitor, and also access the second resistor, the third resistor and the PTC, 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 connected to the second output terminal of the second resistor, the third resistor is connected between the second resistor and the rectifier module, one end of the third resistor is connected to the other end of the second resistor, and the other end of the third resistor is connected to the second output of the rectifier module One end of the PTC is connected to the other end of the second capacitor, the other end of the PTC is connected to one end of the third resistor, and the first switch is connected in parallel to both ends of the PTC and controlled by the controller. Therefore, the power supply circuit can use the first capacitor with a small capacitance (ie, the smoothing filter capacitor), and effectively reduce the power-on surge current when the power supply is connected, thereby ensuring the reliability of the power supply circuit. Moreover, the power supply circuit can use a small-sized first switch, which effectively reduces the cost.

Specifically, the capacitance of the second capacitor is 4-6 times that of the first capacitor.

Further, the power supply circuit of the inverter power supply further includes: a voltage detection module connected to the controller for detecting the first output terminal of the rectification module and the second The voltage between the output terminals, wherein the controller controls the first switch to be turned off when the voltage is higher than the preset value, and controls the first switch to be turned off when the voltage is lower than the preset value. The switch is closed.

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 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 fourth resistor and a second switch connected in series.

Further, the power supply circuit of the inverter power supply further includes: a control module, the control module controls the second switch to close after the power supply to the motor is stopped.

Further, the power supply circuit of the inverter power supply further includes: a third diode, the anode of the third diode is respectively connected to the other end of the second resistor and one end of the third resistor, The cathode of the third diode is connected to the second output end of the rectification module.

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, through the above-mentioned power supply circuit, the power-on surge current when the power supply is connected can be effectively reduced, the reliability of the household appliance can be ensured, and the cost can be effectively reduced.

Description of drawings

Fig. 1 is a schematic circuit 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, third resistor R3, second diode D2, PTC70, first switch Q1, controller 90, second resistor R2, second diode D2, DC/DC module 501, voltage detection Module 71, third diode D3, braking module 80, fourth resistor R4, second switch Q2, control module 91, inductor L1 and third capacitor C3.

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 designate 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 and 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.

As shown in Figures 1-3, the power supply circuit of the inverter power supply according to the embodiment of the present invention includes: a power input module 20, a rectification module 30, a first capacitor C1, an inverter module 40, a discharge module 60, a second The resistor R2 , the third resistor R3 , the second diode D2 , the PTC (Positive Temperature Coefficient, thermistor) 70 , the first switch Q1 and the controller 90 .

The power input module 20 is connected to the power supply 100. Specifically, the power input module 20 has a first input terminal and a second input terminal. The first input terminal of the power input module 20 is connected to the live wire of the AC power supply. The two input ends are connected to the neutral line of the AC power supply, wherein the power supply 100 inputs the 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.

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. 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. 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.

The first capacitor C1 is connected between the first output terminal and the second output terminal of the rectification module 30 . Specifically, the first capacitor C1 smoothes and filters the high-voltage direct current and keeps the high-voltage direct current stable.

The inverter module 40 is respectively connected to the first output end and the second output end of the rectification module 30 . Specifically, the inverter module 40 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, the second input end of the inverter module 40 is connected to the rectification module 30 connected to the second output terminal, and 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 terminal and the second input terminal of the inverter module 40 between. 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 .

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 end of the rectifier module 30. The first diode D1 The cathode of D2 is connected to one end of the first resistor R1, and the other end of the first resistor R1 is connected to one end of the second capacitor C2, wherein there is a first node between the first diode D1 and the first resistor R1, and the first There is a second node between the resistor R1 and the second capacitor C2. As shown in Figures 1-3, 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, then the direction from the anode of the first diode D1 towards the cathode is the same as the output from the rectification module 30 The direction of the high potential at the end is consistent with the direction of the low potential. Moreover, 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 first resistor R1 is used for current limiting, and the current impact on the second capacitor can be reduced through the first resistor R1 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. According to an example of the present invention, the second capacitor C2 can be an electrolytic capacitor, the positive pole of the second capacitor C2 is connected to the other end of the first resistor R1, and the negative pole of the second capacitor C2 is connected to the second output terminal of the rectification module 30 .

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; the third resistor R3 is connected between the second resistor R2 and the rectifier module 30, and the third resistor One end of R3 is connected to the other end of the second resistor R2, and the other end of the third resistor R3 is connected to the second output end of the rectifier module 30; one end of the PTC70 is connected to the other end of the second capacitor C2, and the other end of the PTC70 is connected to the second end of the second capacitor C2. One end of the three resistors R3 is connected; the anode of the second diode D2 is connected to the second node; the first switch Q1 is connected in parallel with the PTC70; the controller 90 is connected to the first switch Q1, and the controller 90 is used to control the first switch Q1 For control, the controller 90 is used to control the first switch Q1 to be turned on or off.

As shown in Figures 1 and 2, the first switch Q1 can be a triode, the collector of the triode is connected to the other end of the second capacitor C2, the emitter of the triode is connected to one end of the third resistor R3, and the base of the triode is connected to the control The controller 90 is connected, and the controller 90 is used for outputting a control signal to the base of the triode to control the closing or closing of the triode.

As shown in Figure 3, the first switch Q1 can be a relay, one end of the switch of the relay is connected to the other end of the second capacitor C2, the other end of the switch of the relay is connected to one end of the third resistor R3, and the coil of the relay passes through the control circuit It is connected with the controller 90, and the controller 90 controls the switch of the relay to be closed or closed by controlling the coil of the relay to be energized or de-energized.

According to a specific example of the present utility model, the capacitance value of the second capacitor C2 is 4-6 times the capacitance value of the first capacitor C1, preferably, the capacitance value of the second capacitor C2 is 5 times the capacitance value of the first capacitor C1 times. That is to say, the first capacitor C1 can be a capacitor with a small capacity, so that the cost and volume of the power supply circuit can be reduced by using a miniaturized capacitor.

Specifically, in the examples shown in FIGS. 1-3 , when the power supply circuit is just powered on, the first switch Q1 is in an off state, and the AC current passes through the power input module 20 and the rectifier module 30 and is converted into high-voltage direct current, and the high-voltage direct current Flow out from the first output end of the rectification module 30, and flow to the first branch formed by the first capacitor C1 and the second branch formed by the first diode D1, the first resistor R1, the second capacitor C2 and the PTC70 respectively, Finally, it flows back to the second output end of the rectification module 30 through the third resistor R3. At this time, the first capacitor C1 and the second capacitor C2 are charged, and since the capacitance value of the second capacitor C2 is 4-6 times that of the first capacitor C1, the current on the second capacitor C2 will be much larger than that of the first capacitor C2. The current on the capacitor C1 passes through the PTC70 in the second branch, which can reduce the power-on surge current and prevent current overshoot.

Afterwards, when the DC bus voltage meets the preset condition, it means that the power-on is completed, the controller 90 controls the first switch Q1 to close, and the power supply circuit works normally. When the first switch Q1 is a triode, the equivalent on-resistance value of the triode is far from Lower than the resistance value of PTC70, the current mainly flows through the triode, that is, the high-voltage direct current flows to the first branch formed by the first capacitor C1 and the first branch formed by the first diode D1, the first resistor R1, the second capacitor C2 and the triode respectively. Three branches, the second capacitor C2 is charged, and PTC70 can be regarded as being short-circuited; when the first switch Q1 is a relay, the current flows through the contacts of the relay, and PTC70 is short-circuited, that is, high-voltage direct current flows to the first capacitor C1 respectively The first branch formed and the third branch formed by the first diode D1, the first resistor R1, the second capacitor C2 and the relay contacts, the second capacitor C2 is charged. At this time, the current flowing through the first switch Q1 is a ripple current, and the first switch Q1 can use a small-sized low-voltage switching tube or a small-capacity low-voltage relay, thereby reducing cost and power consumption.

Afterwards, when the power supply 100 is cut off, the controller 90 controls the first switch Q1 to be turned off, and the electric energy on the second capacitor C2 is consumed by the PTC 70 , so as to realize rapid discharge.

Therefore, the power supply circuit can use the first capacitor with a small capacitance (ie, the smoothing filter capacitor), and effectively reduce the power-on surge current when the power supply is connected, thereby ensuring the reliability of the power supply circuit. Moreover, the power supply circuit can use a low-voltage switching tube with a small specification, which effectively reduces the cost.

Further, according to an embodiment of the present invention, 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, and the DC/DC module The first input end of 501 is connected to the cathode of the second diode D2 , and the second input end of the DC/DC module 501 is connected to the second output end of the rectification module 30 .

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

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.

Specifically, according to an embodiment of the present invention, as shown in Fig. 2-Fig. The voltage between the first output terminal and the second output terminal of the rectification module 30, wherein the controller 90 controls the first switch Q1 to turn off when the voltage is higher than the preset value, and controls the first switch Q1 to turn off when the voltage is lower than the preset value. A switch Q1 is closed.

It should be noted that the voltage between the first output terminal and the second output terminal of the rectification module 30 is the voltage across the first capacitor C1 and also the DC bus voltage.

Specifically, when the power supply circuit is powered on, because the voltage of the drive circuit of the triode is not established (or the coil of the relay is not energized), the first switch Q1 is in the off state, and at this time the AC current flows through the power input module 20 and The rectification module 30 converts it into high-voltage direct current, and the high-voltage direct current charges the first capacitor C1 and the second capacitor C2 respectively, and the voltage across the first capacitor C1 gradually increases. When the voltage across the first capacitor C1 is lower than a preset value, The controller 90 controls the first switch Q1 to be turned off, the power supply circuit cannot work normally, and continues to charge the first capacitor C1. When the voltage across the first capacitor C1 exceeds a preset value, the DC/DC module 501 starts to work as an inverter module 40 supplies power, the controller 90 controls the first switch Q1 to close, and the power supply circuit works normally.

In addition, as shown in Figure 2, the power supply circuit of the inverter power supply can also include a third diode, the anode of the third diode D3 is respectively connected to the other end of the second resistor R2 and one end of the third resistor R3, the second The cathodes of the three diodes D3 are connected to the second output terminal of the rectifier module 30 , that is, the third diode D3 is connected in parallel with the PTC70 . Wherein, during the normal operation of the power supply circuit, the second capacitor C2 can be discharged through the third diode D3, specifically, the electric energy on the second capacitor C2 passes through the second diode D2, the DC/DC module 501 and the second diode D3. Three diodes D3 are released.

Further, according to the embodiments shown in FIGS. 2-3 , the power supply circuit of the inverter power supply further includes: a brake 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 brake module 80 includes a fourth resistor R4 and a second switch Q2 connected in series. More specifically, the second switch Q2 can be a triode, one end of the fourth resistor R4 is connected to one end of the first capacitor C1, the other end of the fourth resistor R4 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 91, and the control module 91 controls the second switch Q2 to close after the power supply to the motor 10 is stopped. More specifically, the control module 91 is connected to the base of the triode. After the power supply to the motor 10 is stopped, the control module 91 can output a high-level signal to the base of the triode to turn on the triode. 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.

Further, as shown in Figures 2-3, the power supply circuit of the inverter power supply may further include: an inductor L1, wherein the inductor L1 is connected between the second output end of the power input module 20 and the second input end of the rectification module 30 During the period, the inductor L1 is used to adjust the power factor of the power supply circuit.

Moreover, as shown in the examples shown in FIGS. 2-3 , the power supply circuit of the inverter power supply may further include: a third capacitor C3. The third capacitor C3 is connected between the first output terminal and the second output terminal of the rectification module 30 , more specifically, the third capacitor C3 can be connected in parallel between the rectification module 30 and the first capacitor C1 .

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 rectification module, and the discharge module includes the first Diode, the first resistor and the second capacitor, and the second resistor, the third resistor and the PTC are also connected, one end of the second resistor is connected to the 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, the third resistor is connected between the second resistor and the rectifier module, one end of the third resistor is connected to the other end of the second resistor, and the other end of the third resistor It is connected to the second output end of the rectifier module, one end of the PTC is connected to the other end of the second capacitor, the other end of the PTC is connected to one end of the third resistor, and at the same time, the first switch is connected in parallel at both ends of the PTC and the first switch is controlled by the controller. switch to control. Therefore, the power supply circuit can use the first capacitor with a small capacitance (ie, the smoothing filter capacitor), and effectively reduce the power-on surge current when the power supply is connected, thereby ensuring the reliability of the power supply circuit. Moreover, the power supply circuit can use a small-sized first switch, which effectively reduces the cost. 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, thereby providing a stable power supply voltage for the inverter module, and absorbing surge energy, and absorbing the reverse direction of the motor after the motor stops. generated electricity.

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 utility model, through the above-mentioned power supply circuit, the power-on surge current when the power supply is connected can be effectively reduced, the reliability of the household appliance can be ensured, and the cost can be effectively reduced.

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 present invention and simplifying the description, rather than indicating or implying the referred device or element Must be in a particular orientation, be constructed in a particular orientation, and operate in a particular orientation, and therefore 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 invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In the present invention, unless otherwise clearly 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 , or integrated; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise specified limit. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention 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 and second feature indirectly through an intermediary. touch. 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 with reference 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 , structure, material or characteristic is 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 embodiments are exemplary and should not be construed as limiting the present invention, and those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

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;

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

To release module, 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 described rectification module first output, the negative electrode of described first diode is connected with one end of described first resistance, the other end of described first resistance is connected with one end of described second electric capacity, 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;

3rd resistance, described 3rd resistance is connected between described second resistance and described rectification module, and one end of described 3rd resistance is connected with the other end of described second resistance, and the described other end of the 3rd resistance is connected with the second output of described rectification module;

One end of PTC, described PTC is connected with the other end of described second electric capacity, and the other end of described PTC is connected with one end of described 3rd resistance;

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

First switch in parallel with described PTC; And

The controller be connected with described first switch, wherein, described controller is used for controlling described first switch.

2. the power supply circuits of inverter as claimed in claim 1, is characterized in that, the capacitance of described second electric capacity is 4-6 times of the capacitance of described first electric capacity.

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

Voltage detection module, described voltage detection module is connected with described controller, for detecting the voltage between described first output of described rectification module and described second output, wherein, described controller disconnects higher than controlling described first switch during preset value at described voltage, and closes lower than controlling described first switch during described preset value at described voltage.

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, 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.

6. the power supply circuits of inverter as claimed in claim 5, is characterized in that, described brake module comprises the 4th resistance and second switch of series connection mutually.

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

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

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

3rd diode, the anode of described 3rd diode is connected with one end of described 3rd resistance with the other end of described second resistance respectively, and the described negative electrode of the 3rd diode is connected with the second output of described rectification module.

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.