CN204721212U - 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 motor; a power input module connected with the power supply; a rectifier module connected with the power input module; It 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; a discharge module connected in parallel with the first capacitor, the discharge module includes mutual The first resistor and the second capacitor connected in series; the inverter module, which is respectively connected to the first output end and the second output end of the rectification module, for controlling the motor; the collection module, which is used for collecting the voltage of the first capacitor; brake signal The generation module is used to generate a braking signal according to the voltage of the first capacitor; the control module is used to perform braking control on the motor according to the braking signal, so as to protect the motor through braking control in case of overvoltage, and ensure that the voltage on the first capacitor is within a preset value. fluctuate within the range.

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

With the advancement of technology, the capacitance of the smoothing filter capacitor of the inverter power supply is gradually decreasing. However, as the capacitance value decreases, the voltage fluctuation on the smoothing filter capacitor becomes larger, especially for motor loads that are prone to out-of-step risks, and the voltage on the smoothing filter capacitor will suddenly rise to a relatively high level, exceeding the endurance of the power device. pressure value.

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 present invention is to provide a power supply circuit for an inverter power supply, which can ensure that the voltage on the smoothing filter capacitor fluctuates within a preset range.

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 motor; 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 supply The input module is connected, and the rectification module has a first output terminal and a second output terminal; a first capacitor, and the first capacitor is connected between the first output terminal and the second output terminal of the rectification module; A discharge module connected in parallel with the first capacitor, the discharge module includes a first resistor and a second capacitor connected in series; an inverter module, the inverter module is connected to the first output terminal and the second output of the rectifier module respectively The terminal is connected to control the motor; the collection module is used to collect the voltage of the first capacitor; the brake signal generation module is used to generate a brake signal according to the voltage of the first capacitor; the control module is used to generate a brake signal according to the voltage of the first capacitor. The braking signal is used to perform braking control on the motor.

According to the power supply circuit of the inverter power supply proposed by the utility model, the voltage of the first capacitor is collected through the acquisition module, and the brake signal generating module generates a brake signal according to the voltage of the first capacitor, and then, the control module performs brake control on the motor according to the brake signal , so as to protect by brake control during overvoltage, ensure that the voltage on the first capacitor used for smoothing and filtering fluctuates within a preset range, and avoid exceeding the withstand voltage value of the power device. Moreover, by connecting the first capacitor between the first output terminal and the second output terminal of the rectifier module, and connecting the discharge module in parallel with the first capacitor, the stability of the rectified voltage can be ensured and the surge can be absorbed Energy, effectively suppress the surge voltage, and effectively improve the power factor.

Further, the power supply circuit of the inverter power supply further includes: a power-taking module for supplying power to the inverter module, and the power-taking module is connected to the inverter module.

Specifically, the discharge module further includes a first diode connected in series with the first resistor and the second capacitor, wherein the direction from the anode of the first diode toward the cathode is the same as that from the rectifier The directions of the first output end and the second output end of the module are the same.

More specifically, the anode of the first diode in the discharge module is connected to the first output terminal of the rectification module, and the cathode of the first diode is connected to one end of the first resistor, so The other end of the first resistor is connected to one end of the second capacitor, and the other end of the second capacitor is connected to the second output end of the rectifier module, wherein the first diode and the first There is a first node between a resistor, and there is a second node between the first resistor and the second capacitor. The power-taking module specifically includes: a second resistor, one end of the second resistor is connected to the first Two nodes are connected, 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 second node; DC/DC A sub-module, the DC/DC sub-module supplies power to the inverter module, the first input terminal of the DC/DC sub-module is connected to the cathode of the second diode, and the DC/DC sub-module The second input end is connected with the second output end of the rectification module.

In addition, the cathode of the second diode can also be connected to the first node.

Specifically, the acquisition module includes: a third resistor, one end of the third resistor is connected to one end of the first capacitor; a fourth resistor, one end of the fourth resistor is connected to the other end of the third resistor The other end of the fourth resistor is connected to the other end of the first capacitor, wherein there is a third node between the third resistor and the fourth resistor.

Moreover, the braking signal generating module includes: a comparator, the first input terminal of the comparator is connected to the third node, the second input terminal of the comparator is connected to a preset voltage, when the third node The brake signal is generated when the voltage of the node is greater than the preset voltage.

Further, the control module is specifically configured to: firstly control the motor to run at reduced power when receiving the braking signal, and then obtain the number of the braking signals received within a preset time, if the braking signal If the number is greater than the preset number threshold, the control module controls the motor to brake.

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 brake absorbing module connected in parallel with the first capacitor, and the brake absorbing module is used to absorb the The current generated by the motor's inertial rotation.

Specifically, the brake absorbing module includes a fifth resistor and a first switch connected in series, wherein the control module 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, which includes the power supply circuit of the inverter power supply.

According to the household appliance proposed by the utility model, through the power supply circuit of the inverter power supply, it can be protected by brake control when overvoltage, so as to ensure that the voltage on the first capacitor used for smoothing and filtering fluctuates within a preset range, and avoid exceeding the power The withstand voltage value of the device can ensure the stability of the rectified voltage, effectively suppress the surge voltage, and effectively improve the power factor.

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 the circuit principle diagram of the power supply circuit of the inverter power supply according to a specific embodiment of the present invention;

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

Fig. 4 is a schematic circuit diagram of a power supply circuit of an inverter power supply according to another specific embodiment of the present invention.

Reference signs:

Motor 10, power input module 20, rectifier module 30, first capacitor C1, discharge module 40, inverter module 50, acquisition module 60, braking signal generation module 70, control module 80, power supply 100, first resistor R1, second Second capacitor C2, third resistor R3, fourth resistor R4, comparator CMP, power-taking module 90, first diode D1, second resistor R2, second diode D2, DC/DC sub-module 501, PTC The protection module 101, the relay KM1, the inductor L1, the brake absorption module 102, the fifth resistor R5 and the first switch K1.

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 motor 10, a power input module 20, a rectification module 30, a first capacitor C1, a discharge module 40, an inverter module 50, an acquisition module 60, and a braking signal generation module 70 and control module 80.

Wherein, the power input module 20 is connected to the power supply 100; the rectification module 30 is connected to the power input module 20, the rectification module 30 has a first output terminal and a second output terminal, and the first capacitor C1 is connected to the first output terminal and the first output terminal of the rectification module 30. Between the second output ends, that is to say, one end of the first capacitor C1 is connected to the first output end of the rectification module 30, and between the other end of the first capacitor C1 and the second output end of the rectification module 30; the discharge module 40 Connected in parallel with the first capacitor C1, the discharge module 40 includes a first resistor R1 and a second capacitor C2 connected in series; the inverter module 50 is connected to the first output end and the second output end of the rectifier module 30 respectively, and the inverter module 50 Used to control the motor 10.

Specifically, the power supply 100 inputs AC power to the power input module 20, the power input module 20 is used to filter the input AC power and output the processed AC power, and the rectification module 30 rectifies the AC power output by the power input module 20 and outputs the first For the direct current of the second voltage, the first capacitor C1 smoothes and filters the direct current of the second voltage and keeps the voltage stable. Afterwards, the inverter module 40 inverts the DC power of the second voltage into AC power and provides it to the motor 10 to control the operation of the motor 10 .

The acquisition module 60 is used to collect the voltage of the first capacitor C1; the brake signal generation module 70 is used to generate a brake signal according to the voltage of the first capacitor C1; the control module 80 is used to perform braking control on the motor 10 according to the brake signal.

It can be understood that the voltage of the first capacitor C1 may be the voltage between the DC bus Lp1 and Lp2.

According to a specific example of the present invention, the brake signal may be a low-level signal. Specifically, the brake signal generation module 70 is connected to the acquisition module 60 to obtain the voltage of the first capacitor C1. When the power supply circuit is subjected to external interference or the motor 10 undergoes a sudden change, the brake signal generation module 70 will A low-level signal is generated. At this time, the control module 80 performs braking control on the motor 10 according to the low-level signal, thereby preventing the voltage across the first capacitor C1 from rising further, and protecting the power device (for example, the power device in the inverter module 50) from damaged by high voltage.

In addition, it should be noted that 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, and the surge voltage can be effectively suppressed. According to an example of the present invention, the second capacitor C2 may be an electrolytic capacitor.

Therefore, the power supply circuit of the inverter power supply proposed by the embodiment of the utility model collects the voltage of the first capacitor through the acquisition module, and the brake signal generating module generates a brake signal according to the voltage of the first capacitor, and then, the control module generates the brake signal according to the brake signal. The motor performs brake control, so as to perform protection through brake control in the event of overvoltage, to ensure that the voltage on the first capacitor used for smoothing and filtering fluctuates within a preset range, and to avoid exceeding the withstand voltage value of the power device. Moreover, by connecting the first capacitor between the first output terminal and the second output terminal of the rectifier module, and connecting the discharge module in parallel with the first capacitor, the stability of the rectified voltage can be ensured and the surge can be absorbed Energy, effectively suppress the surge voltage, and effectively improve the power factor.

According to a specific example of the present invention, the control module 80 can be DSP (Digital Signal Processing, digital signal processing).

According to a specific example of the present invention, the pulsating maximum value of the voltage across the first capacitor C1 is more than twice the pulsating minimum value, so that the power factor can be improved to more than 97%.

According to a specific embodiment of the present invention, as shown in FIGS. 2-4 , the collection module 60 includes: a third resistor R3 and a fourth resistor R4 . Wherein, one end of the third resistor R3 is connected to one end of the first capacitor C1; one end of the fourth resistor R4 is connected to the other end of the third resistor R3, and the other end of the fourth resistor R4 is connected to the other end of the first capacitor C1, Wherein, there is a third node between the third resistor R3 and the fourth resistor R4.

That is to say, the voltage of the first capacitor C1 is detected through the voltage dividing circuit composed of the third resistor R3 and the fourth resistor R4, wherein the voltage of the third node reflects the voltage of the first capacitor C1.

Further, as in the embodiment shown in Fig. 2-4, the braking signal generating module 70 includes: a comparator CMP. The first input terminal of the comparator CMP is connected to the third node, the second input terminal of the comparator CMP is connected to the preset voltage Vref, and a braking signal is generated when the voltage of the third node is greater than the preset voltage Vref.

It should be noted that the preset voltage Vref can be set according to the withstand voltage value of the first capacitor C1, and the preset voltage Vref needs to be lower than the withstand voltage value of the first capacitor C1.

Specifically, the third node can be used as the output terminal of the acquisition module 60 to output the voltage signal to the first input terminal (negative input terminal) of the comparator CMP. After the voltage of the third node enters the comparator CMP, it is compared with the preset voltage Vref of the second input terminal (positive input terminal). If the voltage of the third node is greater than the preset voltage Vref, the output terminal of the comparator CMP will be Outputting a low-level signal is a brake signal; and if the voltage of the third node is less than the preset voltage Vref, the output terminal of the comparator CMP will output a high-level signal.

Specifically, the output terminal of the comparator CMP can be connected with the control module 80 . When the control module 80 detects that the output terminal of the comparator CMP is a low-level signal, the control module 80 immediately enters the brake processing procedure.

Alternatively, the output terminal of the comparator CMP can also be directly connected to the port a of the inverter module 50. According to a specific example of the utility model, the inverter module 50 can include an IPM module, and the port a of the inverter module 50 is an IPM module ( IntelligentPower Module, intelligent power module) port FO. Wherein, when the voltage of the third node is greater than the preset voltage Vref, the comparator CMP outputs a low level signal, and the port a of the inverter module 50 is pulled low, that is, changes from high level to low level. In this way, the control module 80 detects the level of the port a of the inverter module 50 in real time. After the control module 80 detects that the port a of the inverter module 50 is pulled low, the control module 80 immediately enters the brake processing procedure.

In addition, it should be noted that the preset voltage Vref can be set with a hysteresis voltage difference ΔV to avoid frequent braking control. In this way, the output terminal of the comparator CMP outputs a low-level signal when the voltage of the third node is greater than Vref, after that, the output terminal of the comparator CMP is less than Vref-ΔV (that is, the preset voltage Vref Subtracting the hysteresis voltage difference △V difference) will output a high level signal. And when the voltage of the third node is greater than Vref-ΔV and less than Vref, the comparator CMP still outputs a low level signal. Specifically, the hysteresis voltage difference ΔV can be realized by setting a feedback circuit of the comparator CMP.

Specifically, the control module 80 is specifically used to: firstly control the motor 10 to reduce the power to run when receiving the braking signal, and then obtain the number of braking signals received within a preset time; if the number of braking signals is greater than the preset number threshold, then The control module 80 controls the motor 10 to brake, that is, the control module 80 controls the motor 10 to stop running.

It should be noted that the preset time can be recorded when the braking signal is received. Wherein, the preset time can be counted by the timer in the control module 80, and the timer starts counting immediately when receiving the braking signal.

Specifically, when the voltage of the first capacitor C1 meets the preset condition, that is, the voltage of the third node is lower than the preset voltage Vref, the comparator CMP outputs a high-level signal, the control module 80 controls the motor 10 to run normally, and the timer counts The value is zero. In subsequent operations, if the voltage of the first capacitor C1 exceeds the preset condition, that is, the voltage of the third node is greater than the preset voltage Vref, the comparator CMP outputs a low-level signal, and the control module 80 once detects the low-level signal. Immediately control the motor 10 to reduce the power operation, and control the timer to start the technology. Further, if the number of brake signals received within the preset time is greater than the preset number threshold, the control module 80 controls the motor 10 to brake; if the number of brake signals received within the preset time is less than or equal to the preset number threshold, then The control module 80 controls the motor 10 to restore the previous normal operation.

Therefore, the power supply circuit is protected by brake control when overvoltage, so as to ensure that the voltage on the first capacitor used for smoothing and filtering fluctuates within a preset range, and avoid exceeding the withstand voltage value of the power device.

Furthermore, according to another specific embodiment of the present invention, as shown in FIGS. 3-4 , the power supply circuit of the inverter power supply further includes: a power-taking module 90 . Wherein, the power-taking module 90 supplies power to the inverter module 50 , and the power-taking module 90 is connected to the inverter module 50 and the discharge module 40 respectively.

Specifically, according to the examples shown in FIGS. 1-3 , 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, and the second input terminal of the power input module 20 The two input terminals are connected with the neutral line of the AC power supply. And, the power input module 20 has a first output end and a second output end, the rectification module 30 has a first input end and a second input end, the first input end of the rectification module 30 and the first output end of the power input module 20 The second input end of the rectification module 30 is connected to the second output end of the power input module 20 . As shown in FIGS. 2-3 , the rectification module 30 may include a rectification bridge composed of four diodes.

Further, the inverter module 50 has a first input end and a second input end, the first input end of the inverter module 50 is connected to the first output end of the rectification module 30, and the second input end of the inverter module 50 is connected to the rectification module 30 connected to the second output terminal, that is to say, 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 of the inverter module 50 and the second between the input terminals.

Moreover, the inverter module 50 also has a first power supply terminal and a second power supply terminal, the power taking module 90 has a first output terminal and a second output terminal, the first power supply terminal of the inverter module 50 and the first power supply terminal of the power taking module 90 The output terminals are connected, and the second power supply terminal of the inverter module 50 is connected with the second output terminal of the power-taking module 90 .

It can be understood that the power taking module 90 can take stable DC power from the power supply circuit and convert it into a DC power of the first voltage, and then, the power taking module 90 provides the DC power of the first voltage to the control part of the inverter module 50 to satisfy Control part work requirements.

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

Further, according to the embodiment shown in FIGS. 3-4 , the discharge module 40 further includes a first diode D1. The first diode D1 is connected in series with the first resistor R1 and the second capacitor C2, wherein the direction from the anode of the first diode D1 to the cathode is the same as the direction from the first output terminal and the second output terminal of the rectifier module 30 .

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.

Wherein, the first diode D1 is used to isolate the high-voltage part from the low-voltage part. voltage) and the voltage provided to the power-taking module 90 (such as the voltage at point V1 in Fig. 3-Fig. 4) are isolated to reduce mutual influence.

Thus, the discharge module 40 can absorb the surge energy and effectively suppress the surge voltage.

Specifically, according to the embodiment shown in FIGS. 3-4 , the anode of the first diode D1 in the bleeder module 40 is connected to the first output terminal of the rectifier module 30, and the cathode of the first diode D1 is connected to the first resistor One end of R1 is connected, the other end of the first 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 rectifier module 30, wherein the first diode D1 and the first There is a first node between the resistor R1 and a second node between the first resistor R1 and the second capacitor C2.

The power-taking module 90 specifically includes: a second resistor R2 , a second diode D2 and a DC/DC sub-module 501 . Wherein, 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 capacitor C2 is an electrolytic capacitor, the anode of the second capacitor C2 is connected to the second node, the cathode of the second resistor R2 is connected to the second output terminal of the rectifier module 30; the anode of the second diode D2 is connected to the second The nodes are connected; the DC/DC submodule 501 supplies power to the inverter module 50, the first input terminal of the DC/DC submodule 501 is connected to the cathode of the second diode D2, and the second input terminal of the DC/DC submodule 501 is connected to the The second output terminals of the rectification module 30 are connected to each other.

It should be noted that the DC/DC sub-module 501 is used for DC step-down, and the DC/DC sub-module 501 can supply the DC power of the first voltage to the inverter module with the voltage at point V2 in Fig. 3-Fig. 4 50.

It should also 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. Moreover, the second diode D2 is used to prevent reverse discharge, one end of the second capacitor C2 is connected to the first input end of the DC/DC sub-module 501 through the second diode D2, and the second diode D2 is added to , which can ensure the stability of the input voltage of the DC/DC sub-module, and then provide a stable power supply voltage for the inverter module, and can isolate the flyback voltage generated during the working process of the DC/DC sub-module to avoid the DC/DC sub-module The reverse impact of the second capacitor reduces the influence of the power supply on the input voltage of the DC/DC sub-module (such as the voltage at point V2 in Fig. 3-Fig. 4).

Further, as shown in FIG. 4 , the cathode of the second diode D2 may also be connected to the first node. That is to say, the first input end of the DC/DC sub-module 501 can be directly connected to the cathode of the second diode D2.

In other words, the cathode of the first diode D1 is connected to the first input terminal of the DC/DC sub-module 501, thereby reducing the loss of the first resistor when the DC/DC sub-module is working normally.

In addition, according to the example of Fig. 3-Fig. 4, the power input module 20 has a first output end and a second output end, the rectification module 30 has a first input end and a second input end, and the power supply circuit further includes: PTC (Positive Temperature Coefficient, positive temperature coefficient thermistor) protection module 101, the PTC protection module 101 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 101 is used to prevent power-on impact when the power is turned on.

Specifically, as shown in FIGS. 3-4 , the power supply circuit further includes a relay KM1 , and a switch of the relay KM1 is connected in parallel with the PTC protection module 101 .

Further, according to the embodiment shown in FIGS. 3-4 , the power supply circuit of the inverter power supply further includes: an inductor L1 connected in series with the PTC protection module 101 for adjusting the power factor of the power supply circuit.

In addition, according to the embodiments shown in FIGS. 3-4 , the power supply circuit of the inverter power supply further includes: a brake absorbing module 102 . The brake absorbing module 102 is connected in parallel with the first capacitor C1, and the brake absorbing module 102 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 absorbing module 102 includes a fifth resistor R5 and a first switch K1 connected in series. More specifically, the first switch K1 can be a triode, one end of the fifth resistor R5 is connected to one end of the first capacitor C1, the other end of the fifth resistor R5 is connected to the collector of the triode, and the emitter of the triode is grounded.

Wherein, the control module 80 is further configured to control the first switch K1 to close after the power supply to the motor 10 is stopped. More specifically, the control module 80 is connected to the base of the triode. After the power supply to the motor 10 is stopped, the control module 80 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 absorption module 102 works to absorb the electric energy produced 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 absorbing module 102 In this way, the motor can be stopped quickly 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 voltage of the first capacitor is collected through the acquisition module, and the brake signal generation module generates the brake signal according to the voltage of the first capacitor, and then the control module according to The braking signal performs braking control on the motor, so as to protect the motor through braking control during overvoltage, so as to ensure that the voltage on the first capacitor used for smoothing and filtering fluctuates within a preset range, and avoid exceeding the withstand voltage value of the power device. Moreover, by connecting the first capacitor between the first output terminal and the second output terminal of the rectifier module, and connecting the discharge module in parallel with the first capacitor, the stability of the rectified voltage can be ensured and the surge can be absorbed Energy, effectively suppress the surge voltage, and effectively improve the power factor. In addition, the power supply circuit can also absorb the surge energy, and absorb the electric energy generated by the motor reversely 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, through the power supply circuit of the inverter power supply, it can be protected by brake control during overvoltage, so as to ensure that the voltage on the first capacitor used for smoothing and filtering fluctuates within a preset range, avoiding It exceeds the withstand voltage value of the power device, and can ensure the stability of the rectified voltage, effectively suppress the surge voltage, and effectively improve the power factor.

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 (13)

1. A power supply circuit of an inverter power supply, comprising: motor; 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, and the rectification 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 rectification module; A bleeder module connected in parallel with the first capacitor, the bleeder module includes a first resistor and a second capacitor connected in series; an inverter module, the inverter module is respectively connected to the first output end and the second output end of the rectification module, and is used to control the motor; an acquisition module, configured to acquire the voltage of the first capacitor; a braking signal generating module, configured to generate a braking signal according to the voltage of the first capacitor; and A control module, configured to perform braking control on the motor according to the braking signal. 2. The power supply circuit of the inverter power supply as claimed in claim 1, further comprising: A power-taking module for supplying power to the inverter module, the power-taking module is connected to the inverter module. 3. The power supply circuit of an inverter power supply according to claim 2, wherein the discharge module further comprises a first diode connected in series with the first resistor and the second capacitor, wherein, from the The direction from the anode of the first diode to the cathode is the same as the direction from the first output end and the second output end of the rectification module. 4. The power supply circuit of an inverter power supply as claimed in claim 3, wherein the anode of the first diode in the discharge module is connected to the first output terminal of the rectifier module, and the first The cathode of the diode is connected to one end of the first resistor, the other end of the first resistor is connected to one end of the second capacitor, and the other end of the second capacitor is connected to the second output of the rectifier module terminal, 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, and the power-taking module specifically includes : a 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 second diode, the anode of the second diode is connected to the second node; A DC/DC submodule, the DC/DC submodule supplies power to the inverter module, the first input terminal of the DC/DC submodule is connected to the cathode of the second diode, and the DC/DC The second input end of the sub-module is connected with the second output end of the rectification module. 5. The power supply circuit of an inverter power supply according to claim 4, wherein the cathode of the second diode is also connected to the first node. 6. the power supply circuit of inverter power supply as claimed in claim 1, is characterized in that, described collection module comprises: a third resistor, one end of the third resistor is connected to one end of the first capacitor; A fourth resistor, one end of the fourth resistor is connected to the other end of the third resistor, and the other end of the fourth resistor is connected to the other end of the first capacitor, wherein the third resistor and the second There is a third node between the four resistors. 7. The power supply circuit of the inverter power supply as claimed in claim 6, wherein the braking signal generation module comprises: A comparator, the first input terminal of the comparator is connected to the third node, the second input terminal of the comparator is connected to a preset voltage, when the voltage of the third node is greater than the preset voltage The brake signal is generated. 8. The power supply circuit of the inverter power supply as claimed in claim 7, wherein the control module is specifically used for: When the braking signal is received, the motor is first controlled to run at reduced power, and then the number of the braking signals received within the preset time is obtained. If the number of the braking signals is greater than the preset number threshold, the control The module controls the motor brake. 9. The power supply circuit of the inverter power supply as claimed in claim 1, wherein the power input module has a first output terminal and a second output terminal, and the rectification module has a first input terminal and a second input terminal , the power supply circuit also includes: A PTC protection module connected between the second output terminal of the power input module and the second input terminal of the rectification module. 10. The power supply circuit of the inverter power supply as claimed in claim 9, further comprising: The inductor connected in series with the PTC protection module is used to adjust the power factor of the power supply circuit. 11. The power supply circuit of the inverter power supply as claimed in claim 1, further comprising: A brake absorbing module, the brake absorbing module is connected in parallel with the first capacitor, and the brake absorbing module is used to absorb the current generated due to the inertial rotation of the motor after the power supply to the motor is stopped. 12. The power supply circuit of an inverter power supply according to claim 11, wherein the brake absorbing module includes a fifth resistor and a first switch connected in series, wherein the control module is also used to After the motor stops supplying power, the first switch is controlled to be closed. 13. A household appliance, characterized in that it comprises the power supply circuit of the inverter power supply according to any one of claims 1-12.