CN215528904U - No electrolytic capacitor inverter circuit and air conditioner - Google Patents
No electrolytic capacitor inverter circuit and air conditioner Download PDFInfo
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- CN215528904U CN215528904U CN202121272908.XU CN202121272908U CN215528904U CN 215528904 U CN215528904 U CN 215528904U CN 202121272908 U CN202121272908 U CN 202121272908U CN 215528904 U CN215528904 U CN 215528904U
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Abstract
The utility model provides an electrolytic capacitor-free frequency conversion circuit and an air conditioner, wherein the electrolytic capacitor-free frequency conversion circuit comprises an absorption circuit, the absorption circuit is connected in parallel with the positive end and the negative end of a direct current bus of the frequency conversion circuit, the absorption circuit comprises a diode Ds, a current-limiting resistor, an absorption capacitor Cs and an absorption capacitor load RL, the absorption capacitor load RL is connected in parallel with the two ends of the absorption capacitor Cs, the diode Ds and the current-limiting resistor are respectively connected in series in the absorption circuit, the current-limiting resistor is a thermistor, and the resistance value of the current-limiting resistor can be reduced along with the rise of temperature.
Description
Technical Field
The utility model relates to the technical field of electrolytic capacitor-free frequency conversion, in particular to an electrolytic capacitor-free frequency conversion circuit and an air conditioner.
Background
In the existing electrolytic capacitor-free frequency conversion technology, a small-capacity film capacitor is often used as a direct-current bus capacitor, and in order to prevent energy from being fed back to a direct-current bus terminal when the motor is controlled abnormally or under other abnormal conditions, the direct-current bus voltage is too high to cause device damage, an absorption circuit is usually designed in an electrolytic capacitor-free frequency conversion circuit. The absorption circuit generally comprises a diode, a current-limiting resistor, an absorption capacitor and an absorption capacitor load, and the absorption capacitor generally adopts a 150uF electrolytic capacitor. The absorption circuit can absorb energy fed back to a direct current bus end when the motor is controlled abnormally or under other abnormal conditions, but at the moment when the circuit is powered on, the absorption capacitor is charged to generate large impact current, and the impact current can directly influence the service life of a device and even cause the problems of tripping and the like of an air switch.
In the prior art, the adverse effect caused by the impact current is solved by adding the charging control circuit, but the charging control circuit has a complex structure and high cost.
The present application is proposed to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
The utility model designs an electrolytic capacitor-free frequency conversion circuit and an air conditioner, and aims to solve the problems that when an absorption circuit in the existing electrolytic capacitor-free frequency conversion circuit is powered on, the absorption capacitor is charged to generate a large impact current, the impact current directly influences the service life of a device and even causes tripping of an air switch, and the like.
In order to solve the problems, the utility model discloses an electrolytic capacitor-free frequency conversion circuit which comprises an absorption circuit, wherein the absorption circuit is connected in parallel with the positive end and the negative end of a direct current bus of the frequency conversion circuit, the absorption circuit comprises a diode Ds, a current-limiting resistor, an absorption capacitor Cs and an absorption capacitor load RL, the absorption capacitor load RL is connected in parallel with two ends of the absorption capacitor Cs, the diode Ds and the current-limiting resistor are respectively connected in series in the absorption circuit, the current-limiting resistor is a thermistor, and the resistance value of the current-limiting resistor can be reduced along with the rise of temperature.
The electrolytic capacitor-free frequency conversion circuit is provided with the absorption circuit, the thermistor is arranged in the absorption circuit, and the resistance value of the thermistor can be reduced along with the rise of the temperature, so that when charging is started, because the temperature of the thermistor is low and the resistance value of the thermistor is large, the impact current in the absorption circuit can be reduced through the thermistor, the problems that the absorption capacitor Cs is charged to generate large impact current, the service life of a device is shortened, or the idle opening tripping operation is caused are solved, the service life of the device is prolonged, and the use experience of a user is optimized; and the absorption circuit has simple structure, low cost and convenient realization.
Further, the current limiting resistor is an NTC negative temperature coefficient thermistor.
Ntc (negative Temperature coefficient) refers to a thermistor phenomenon and material having a negative Temperature coefficient, in which the resistance decreases exponentially with the Temperature rise. Therefore, the NTC thermistor with negative temperature coefficient is a thermistor with negative temperature coefficient, the resistance value characteristic of the resistor shows nonlinear reduction along with temperature rise, and when the NTC thermistor is used in the absorption circuit, the purposes of preventing the absorption capacitor Cs from being charged to generate larger impact current, reducing the service life of the device or causing tripping of the air switch can be achieved through the change rule of the resistance value along with the temperature.
Furthermore, the absorption circuit is connected in parallel with the positive end and the negative end of the direct current bus of the frequency conversion circuit through a rectifier bridge, and the rectifier bridge can rectify alternating current into direct current.
And rectifying the alternating current into direct current through the rectifier bridge to provide a direct current power supply for the power electronic device.
Further, the rectifier bridge comprises four rectifier diodes, and the four rectifier diodes are connected in a bridge type full-wave rectifier circuit mode.
The rectifier bridge can realize the function of voltage reduction and rectification, and the working stability of the power electronic device can be improved.
Furthermore, power electronic devices are connected in parallel at the positive end and the negative end of the direct-current bus of the frequency conversion circuit.
The electrolytic capacitor-free frequency conversion circuit is used for protecting the power electronic device, so that the situation that when the power electronic device is controlled abnormally or energy of other abnormal conditions is fed back to the direct current bus end, the direct current bus is damaged due to overhigh voltage can be prevented.
Furthermore, the power electronic device is a motor, and the motor is connected with the direct current bus through an inverter circuit.
The motor is connected with the direct current bus through the inverter circuit, so that the working stability of the motor can be improved.
Furthermore, the electrolytic capacitor-free frequency conversion circuit further comprises a direct current bus capacitor Cdc, and the direct current bus capacitor Cdc is connected in parallel to the positive end and the negative end of the direct current bus.
The direct current bus capacitor Cdc can realize the functions of energy storage and filtering.
Further, the dc bus capacitor Cdc is a thin film capacitor.
The thin-film capacitor is adopted as the direct-current bus capacitor Cdc, and the direct-current bus capacitor Cdc has the advantages of high insulation resistance and good heat resistance.
Further, the absorption capacitor Cs is an electrolytic capacitor.
The electrolytic capacitor is adopted as the absorption capacitor Cs, so that the advantages of large capacitance and low cost can be achieved.
An air conditioner comprises the electrolytic-capacitor-free frequency conversion circuit.
The application the electrolytic capacitor-free frequency conversion circuit and the air conditioner have the following advantages: firstly, the electrolytic capacitor-free frequency conversion circuit is provided with the absorption circuit, the thermistor is arranged in the absorption circuit, and the resistance value of the thermistor can be reduced along with the rise of the temperature, so that when charging is started, because the temperature of the thermistor is lower and the resistance value is larger, the impact current in the absorption circuit can be reduced through the thermistor, the problems that the absorption capacitor Cs is charged to generate larger impact current, the service life of a device is shortened, or the idle trip is caused are solved, and the effects of prolonging the service life of the device and optimizing the use experience of a user are realized; second, the application the electrolytic capacitor-free frequency conversion circuit simple structure, with low costs, be convenient for realize.
Drawings
FIG. 1 is a non-electrolytic capacitor inverter circuit according to the present invention.
Description of reference numerals:
1. an absorption circuit; 2. a power electronic device; 3. a rectifier bridge.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1, an electrolytic capacitor-free frequency conversion circuit includes an absorption circuit 1, where the absorption circuit 1 is connected in parallel to positive and negative ends of a dc bus of the frequency conversion circuit to protect a power electronic device 2, the absorption circuit 1 includes a diode Ds, a current limiting resistor, an absorption capacitor Cs, and an absorption capacitor load RL, the absorption capacitor load RL is connected in parallel to two ends of the absorption capacitor Cs, and the diode Ds and the current limiting resistor are respectively connected in series in the absorption circuit 1, where the absorption capacitor load RL and the absorption capacitor Cs are connected in parallel and then connected in series in the absorption circuit 1 with the diode Ds and the current limiting resistor, respectively, the current limiting resistor is a thermistor, and a resistance value of the current limiting resistor can decrease with an increase in temperature.
The application no electrolytic capacitor inverter circuit through setting up absorption circuit 1 to set up thermistor in absorption circuit 1, because thermistor's resistance value can descend along with the rise of temperature, make when charging the beginning, because thermistor's temperature is lower, the resistance value is great, can reduce the impulse current in the absorption circuit 1 through thermistor, reach and prevent absorption capacitor Cs charges and produces great impulse current, reduces the life of device, or leads to the problem of the trip of opening empty, realizes improving device life, optimizes the effect that user used and experiences. In addition, compare with the mode that adopts charging circuit among the prior art, absorption circuit 1 still have simple structure, with low costs, the advantage of being convenient for realize.
Further, the current limiting resistor is an NTC negative temperature coefficient thermistor. Among them, ntc (negative Temperature coefficient) refers to a thermistor phenomenon and material having a negative Temperature coefficient in which resistance decreases exponentially with Temperature rise. Therefore, the NTC thermistor is a negative temperature coefficient thermistor, and the resistance value characteristic of the resistor shows a nonlinear decrease with a temperature increase, and when the NTC thermistor is used in the absorption circuit 1, the absorption capacitor Cs can be prevented from being charged to generate a large impact current, the service life of the device can be shortened, or the air switch can be tripped due to the change rule of the resistance value with the temperature.
Furthermore, the absorption circuit 1 is connected in parallel with the positive end and the negative end of a direct current bus of the frequency conversion circuit through a rectifier bridge 3, and the rectifier bridge 3 can rectify alternating current into direct current.
Generally, as in 220V power supply equipment, since 220V is alternating current and the electronic devices generally used by us are weak current, voltage reduction rectification is required, the application can convert alternating current generated by an alternating current generator into direct current through a rectifier bridge 3 on one hand, so as to achieve the purposes of supplying power to electric equipment and charging a storage battery; on the other hand, the current of the storage battery can be limited to flow back to the generator, and the generator is protected from being burnt out by the reverse current.
Further, the rectifier bridge 3 comprises four rectifier diodes, and the four rectifier diodes are connected in a bridge type full-wave rectifier circuit mode.
As shown in fig. 1, four rectifier diodes are connected to form a bridge rectifier circuit. The full-wave rectification is realized by guiding the secondary output to the load in the negative half period by using the guiding action of the rectifier diode.
Furthermore, the positive end and the negative end of the direct current bus of the frequency conversion circuit are also connected with a power electronic device 2 in parallel.
The electrolytic capacitor-free frequency conversion circuit is used for the power electronic device 2, so that the situation that when the power electronic device 2 is controlled to be abnormal or energy of other abnormal conditions is fed back to a direct current bus end, the direct current bus voltage is too high, and the device is damaged can be prevented.
Further, the power electronic device 2 is a motor, and the motor is connected with a direct current bus through an inverter circuit so as to improve the working stability of the motor.
Furthermore, electrolytic capacitor-free frequency conversion circuit still includes direct current bus electric capacity Cdc, direct current bus electric capacity Cdc connects in parallel in direct current bus positive and negative end, and then passes through direct current bus electric capacity Cdc can realize the effect of energy storage and filtering.
Further, direct current bus electric capacity Cdc is film capacitor, adopts film capacitor as direct current bus electric capacity Cdc can have the insulation resistance height, advantage that the heat resistance is good.
Furthermore, the absorption capacitor Cs is an electrolytic capacitor, and the absorption capacitor Cs using the electrolytic capacitor has the advantages of large capacitance and low cost.
It should be noted that the electrolytic capacitor-free frequency conversion circuit described in the present application refers to a circuit at least partially using electrolytic capacitor-free capacitors, and utilizes the characteristics of electrolytic capacitor-free capacitors, and does not mean that all capacitors are electrolytic capacitor-free capacitors.
The electrolytic-capacitor-less frequency conversion circuit is described in detail by a specific embodiment.
As shown in fig. 1, the effective value of the input voltage is 220V, wherein a 30A rectifier module is used for the rectifier bridge 3, a 20uF thin film capacitor is used for the dc bus capacitor Cdc, the rated current of the diode Ds in the absorption circuit 1 is 3A, the impact current of the short-time impact is 50A, the cooling resistance of the NTC negative temperature coefficient thermistor is 16 Ω, the absorption capacitor Cs is a 150uF electrolytic capacitor, and the load resistor RL is the equivalent resistance of a load such as a switching power supply, and the resistance value thereof is about 5K Ω.
Under the above conditions, in the worst case, the power phase at the moment of power-on is at 90 °, and the instantaneous value uac of the input voltageInstant heating device310V, resistance value R of the current limiting resistorNTCWhen the voltage drop between the rectifier bridge 3 and the diode is small and negligible, the impact current i is negligiblecCan be calculated from:
at this time, uac will beInstant heating device＝310V，RNTCSubstituting the data to obtain i when the value is 16 omegacWhen the surge current is equal to 19.375a, the surge current is satisfactory.
In the electrolytic capacitor-free frequency conversion circuit, during the circuit operation period after the completion of power-on and charging, the resistance value of the NTC negative temperature coefficient thermistor is reduced due to the current thermal effect, and the circuit loss is small.
In addition, the application also provides an air conditioner, and the air conditioner comprises the electrolytic capacitor-free frequency conversion circuit.
In summary, it is easy to obtain the electrolytic capacitor-free inverter circuit and the air conditioner of the present application, which have the following advantages: firstly, an absorption circuit 1 designed in the electrolytic capacitor-free frequency conversion circuit uses an NTC negative temperature coefficient thermistor as a current-limiting resistor, and the NTC negative temperature coefficient thermistor is in a cooling state at the power-on moment and during the operation of a device, has a large resistance value, and can limit the charging current and the voltage of a direct-current bus to a safe range; secondly, the method comprises the following steps. The electrolytic capacitor-free frequency conversion circuit is simple in structure, low in cost and convenient to realize.
Although the present invention is disclosed above, the present invention is not limited thereto. In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the utility model as defined in the appended claims.
Claims (10)
1. The electrolytic-capacitor-free frequency conversion circuit comprises an absorption circuit (1), wherein the absorption circuit (1) is connected in parallel with the positive end and the negative end of a direct-current bus of the frequency conversion circuit, and is characterized in that the absorption circuit (1) comprises a diode Ds, a current-limiting resistor, an absorption capacitor Cs and an absorption capacitor load RL, the absorption capacitor load RL is connected in parallel with two ends of the absorption capacitor Cs, the diode Ds and the current-limiting resistor are respectively connected in series in the absorption circuit (1), the current-limiting resistor is a thermistor, and the resistance value of the current-limiting resistor can be reduced along with the rise of temperature.
2. The electrolytic capacitor-free frequency conversion circuit of claim 1, wherein the current limiting resistor is an NTC negative temperature coefficient thermistor.
3. The electrolytic capacitor-free frequency conversion circuit according to claim 1, wherein the absorption circuit (1) is connected in parallel to the positive and negative ends of a direct current bus of the frequency conversion circuit via a rectifier bridge (3), and the rectifier bridge (3) is capable of rectifying alternating current into direct current.
4. The electrolytic capacitor-less frequency conversion circuit according to claim 3, wherein the rectifier bridge (3) comprises four rectifier diodes connected in the form of a bridge full-wave rectifier circuit.
5. The electrolytic-capacitor-free frequency conversion circuit according to claim 1, characterized in that power electronics (2) are further connected in parallel at the positive and negative ends of the direct current bus of the frequency conversion circuit.
6. The electrolytic-capacitor-free frequency conversion circuit according to claim 5, wherein the power electronic device (2) is a motor, and the motor is connected with a direct current bus through an inverter circuit.
7. The electrolytic capacitor-free frequency conversion circuit of claim 1, further comprising a direct current bus capacitor Cdc connected in parallel to positive and negative ends of the direct current bus.
8. The electrolytic capacitor-free frequency conversion circuit of claim 7, wherein the direct current bus capacitor Cdc is a thin film capacitor.
9. The electrolytic capacitor-less frequency conversion circuit of claim 1, wherein the absorption capacitor Cs is an electrolytic capacitor.
10. An air conditioner, characterized in that, the air conditioner includes the inverter circuit without electrolytic capacitor of any claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121272908.XU CN215528904U (en) | 2021-06-08 | 2021-06-08 | No electrolytic capacitor inverter circuit and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121272908.XU CN215528904U (en) | 2021-06-08 | 2021-06-08 | No electrolytic capacitor inverter circuit and air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215528904U true CN215528904U (en) | 2022-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121272908.XU Active CN215528904U (en) | 2021-06-08 | 2021-06-08 | No electrolytic capacitor inverter circuit and air conditioner |
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| Country | Link |
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| CN (1) | CN215528904U (en) |
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2021
- 2021-06-08 CN CN202121272908.XU patent/CN215528904U/en active Active
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