CN214850518U - Capacitor charging control circuit, power factor correction circuit and air conditioner - Google Patents
Capacitor charging control circuit, power factor correction circuit and air conditioner Download PDFInfo
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- CN214850518U CN214850518U CN202023203651.0U CN202023203651U CN214850518U CN 214850518 U CN214850518 U CN 214850518U CN 202023203651 U CN202023203651 U CN 202023203651U CN 214850518 U CN214850518 U CN 214850518U
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Abstract
The utility model discloses a capacitor charging control circuit, power factor correction circuit and air conditioner relates to electron technical field. The capacitor charging control circuit comprises a microprocessor, an input voltage regulating circuit, a capacitor to be charged and a voltage detection circuit; the voltage detection circuit converts the charging voltage at two ends of the capacitor to be charged into a first voltage signal and transmits the first voltage signal to the microprocessor; the microprocessor generates a control signal according to the first voltage signal and transmits the control signal to the input voltage regulating circuit; the input voltage adjusting circuit adjusts the input power supply according to the control signal so as to charge the capacitor to be charged. The utility model discloses a detect the charging voltage of charging capacitor to confirm the charging condition of charging capacitor, thereby adjust the voltage value of charging capacitor, in order to improve charging capacitor's life.
Description
Technical Field
The utility model relates to the field of electronic technology, especially, relate to a electric capacity charge control circuit, power factor correction circuit and air conditioner.
Background
The capacitance of a capacitor refers to the ability to hold charge and is the amount of free charge stored at a given potential difference, i.e., once the capacitance is reduced, the amount of charge that can be stored at the same potential difference is reduced. In the use process of the capacitor, the conditions of overvoltage application, overlarge ripple current, reverse voltage application, frequent charge and discharge, overhigh use temperature and the like cause the capacitance to be reduced, thereby influencing the service life of the capacitor. Therefore, how to increase the service life of the capacitor is an urgent technical problem to be solved.
The above is only for the purpose of assisting understanding of the technical solutions of the present invention, and does not represent an admission that the above is the prior art.
SUMMERY OF THE UTILITY MODEL
A primary object of the present invention is to provide a capacitor charging control circuit, power factor correction circuit and air conditioner, which can solve the problem of low service life of capacitor in the prior art.
In order to achieve the above object, the utility model provides an electric capacity charge control circuit, electric capacity charge control circuit includes: the device comprises a microprocessor, an input voltage regulating circuit, a capacitor to be charged and a voltage detection circuit; wherein,
the input end of the input voltage regulating circuit is connected with an input power supply, the output end of the input voltage regulating circuit is connected with the capacitor to be charged, the input end of the voltage detection circuit is connected with the capacitor to be charged, the output end of the voltage detection circuit is connected with the first input end of the microprocessor, and the output end of the microprocessor is connected with the control end of the input voltage regulating circuit;
the voltage detection circuit is used for converting the charging voltage at two ends of the capacitor to be charged into a first voltage signal and transmitting the first voltage signal to the microprocessor;
the microprocessor is used for generating a first control signal according to the first voltage signal and transmitting the first control signal to the input voltage regulating circuit;
and the input voltage regulating circuit is used for regulating the input power supply according to the control signal so as to charge the capacitor to be charged.
Optionally, the voltage detection circuit includes: the circuit comprises a first resistor, a second resistor, a third resistor, a first diode, a second diode and a first capacitor; wherein,
the first end of the first resistor is connected with the capacitor to be charged, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is grounded, the cathode of the first diode is connected with a preset power supply, the anode of the first diode is respectively connected with the second end of the first resistor, the first end of the third resistor and the cathode of the second diode, the anode of the second diode is grounded, the second end of the third resistor is respectively connected with the first end of the first capacitor and the first input end of the microprocessor, and the second end of the first capacitor is grounded.
Optionally, the capacitor charging control circuit further includes a current detection circuit; the input end of the current detection circuit is connected with the input voltage regulation circuit, and the output end of the current detection circuit is connected with the second input end of the microprocessor;
the current detection circuit is used for collecting the loop current of the input voltage regulating circuit, generating a current signal according to the loop current and transmitting the current signal to the microprocessor;
the microprocessor is further configured to generate a second control signal according to the current signal and the first voltage signal, and transmit the second control signal to the input voltage regulating circuit.
Optionally, the input voltage regulating circuit includes a sampling resistor, and the current detecting circuit includes: the circuit comprises an amplifier, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor and a ninth resistor; wherein;
the first end of sampling resistance with the first end of fourth resistance is connected, the second end of fourth resistance with the inverting input end of amplifier is connected, the second end of sampling resistance with the first end of fifth resistance is connected, the second end of fifth resistance respectively with the first end of sixth resistance reaches the non-inverting input end of amplifier is connected, the second end of sixth resistance is connected with predetermineeing the power, the first end of seventh resistance with the inverting input end of amplifier is connected, the second end of seventh resistance respectively with the output of amplifier reaches the first end of eighth resistance is connected, the second end ground connection of eighth resistance, the first end of ninth resistance with the second end of eighth resistance is connected, the second end of ninth resistance with microprocessor connects.
Optionally, the input voltage regulating circuit includes a power conversion circuit and a voltage regulating circuit, an input end of the power conversion circuit is connected to the input power supply, an output end of the power conversion circuit is connected to an input end of the voltage regulating circuit, and an output end of the voltage regulating circuit is connected to the capacitor to be charged;
the power supply conversion circuit is used for converting an input power supply into a charging voltage;
and the voltage regulating circuit is used for regulating the charging voltage according to the control signal so as to charge the capacitor to be charged.
Optionally, the voltage regulating circuit includes a second capacitor, an inductor, a third diode, and an insulated gate bipolar transistor; wherein,
the first end of the second capacitor is connected with the positive output end of the power supply conversion circuit, and the second end of the second capacitor is connected with the negative output end of the power supply conversion circuit; the first end of the inductor is connected with the first end of the second capacitor, the second end of the inductor is connected with the anode of the third diode, the cathode of the third diode is connected with the first end of the capacitor to be charged, the collector of the insulated gate bipolar transistor is connected with the second end of the inductor, the emitter of the insulated gate bipolar transistor is connected with the second end of the second capacitor and the second end of the capacitor to be charged respectively, and the grid of the insulated gate bipolar transistor is connected with the output end of the microprocessor.
Optionally, the input power supply is an ac input power supply, the power conversion circuit includes an electromagnetic interference filter circuit and a rectifier bridge, an input end of the electromagnetic interference filter circuit is connected to the ac input power supply, an output end of the electromagnetic interference filter circuit is connected to an input end of the rectifier bridge, and an output end of the rectifier bridge is connected to an input end of the voltage regulation circuit.
Optionally, the capacitor charging control circuit further includes an ac voltage detection circuit, an input end of the ac voltage detection circuit is connected to an output end of the power conversion circuit, and an output end of the ac voltage detection circuit is connected to the second input end of the microprocessor;
the alternating voltage detection circuit is used for collecting the output voltage of the power supply conversion circuit, generating a second voltage signal according to the output voltage and transmitting the second voltage signal to the microprocessor;
the microprocessor is further configured to generate a third control signal according to the first voltage signal and the second voltage signal, and transmit the third control signal to the input voltage adjusting circuit.
In order to achieve the above object, the present invention further provides a power factor correction circuit, which includes a tenth resistor and the capacitor charging control circuit as described above, wherein the capacitor to be charged is an electrolytic capacitor; wherein,
a first end of the tenth resistor is connected with the anode of the electrolytic capacitor, a second end of the tenth resistor is connected with the cathode of the electrolytic capacitor, the cathode of the electrolytic capacitor is grounded, and the anode of the electrolytic capacitor is connected with a voltage output port;
the voltage output port is used for providing output voltage to the outside.
In order to achieve the above object, the present invention further provides an air conditioner, which includes the power factor correction circuit as described above.
In the utility model, the capacitor charging control circuit comprises a microprocessor, an input voltage regulating circuit, a capacitor to be charged and a voltage detection circuit; the voltage detection circuit converts the charging voltage at two ends of the capacitor to be charged into a first voltage signal and transmits the first voltage signal to the microprocessor; the microprocessor generates a control signal according to the first voltage signal and transmits the control signal to the input voltage regulating circuit; the input voltage adjusting circuit adjusts the input power supply according to the control signal so as to charge the capacitor to be charged. The utility model discloses a detect the charging voltage of charging capacitor to confirm the charging condition of charging capacitor, thereby adjust the voltage value of charging capacitor, in order to improve charging capacitor's life.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of a capacitor charging control circuit according to a first embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a second embodiment of the capacitor charging control circuit according to the present invention;
fig. 3 is a schematic diagram of the circuit structure of the power factor correction circuit of the present invention;
fig. 4 is a schematic circuit diagram of the current detection circuit.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) | |
| 100 | Microprocessor | R1～R10 | First to |
|
| 200 | Input voltage regulating circuit | C1～C2 | First to |
|
| 2001 | Power supply conversion circuit | D1～D3 | First to |
|
| 20011 | Electromagnetic interference filter circuit | L | High- |
|
| 20012 | Rectifier bridge | IGBT | Insulated gate |
|
| 2002 | Voltage regulating circuit | | Sampling resistor | |
| 300 | Capacitor to be charged | A | Amplifier with a high- |
|
| 400 | Voltage detection circuit | | Preset voltage | |
| 500 | Current detection circuit | DC | |
|
| 600 | Alternating voltage detection circuit |
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, it should be considered that the combination of the technical solutions does not exist, and is not within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic circuit structure diagram of a first embodiment of the capacitor charging control circuit of the present invention.
As shown in fig. 1, in the present embodiment, the capacitor charge control circuit includes: a microprocessor 100, an input voltage regulating circuit 200, a capacitor 300 to be charged and a voltage detecting circuit 400; the input end of the input voltage regulating circuit 200 is connected to the input power supply, the output end of the input voltage regulating circuit 200 is connected to the capacitor 300 to be charged, the input end of the voltage detecting circuit 400 is connected to the capacitor 300 to be charged, the output end of the voltage detecting circuit 400 is connected to the first input end of the microprocessor 100, and the output end of the microprocessor 100 is connected to the control end of the input voltage regulating circuit 200.
The voltage detection circuit 400 is configured to convert the charging voltage across the capacitor 300 to be charged into a first voltage signal, and transmit the first voltage signal to the microprocessor 100.
It should be noted that the process of converting the charging voltage into the first voltage signal may include a step-down process, and the like. The voltage that the microprocessor can bear is limited, usually below 3.3V, and when the charging voltage is higher, it needs to be stepped down to obtain a proper voltage signal. In a specific implementation, the voltage detection circuit 400 includes a voltage divider circuit, and the first voltage signal with a lower voltage is obtained through voltage division.
The microprocessor 100 is configured to generate a first control signal according to the first voltage signal, and transmit the first control signal to the input voltage regulating circuit 200.
It can be understood that, a corresponding control program is preset inside the microprocessor, and is used for determining the actual voltage condition of the capacitor 300 to be charged, for example, the voltage value across the capacitor 300 to be charged, according to the received first voltage signal. The ripple voltage of the capacitor 300 to be charged can be determined by detecting the voltage values at the two ends in real time.
It should be noted that the first control signal may be a pulse signal. The microprocessor 100 may generate pulse signals of different duty ratios according to the first voltage signal. For example, when a voltage value or ripple voltage corresponding to the first voltage signal is greater than a first preset value U1, a pulse signal with a first duty ratio is generated; when the voltage value or ripple voltage corresponding to the first voltage signal is greater than a second preset value U2, generating a pulse signal with a second duty ratio; and when the voltage value or the ripple voltage corresponding to the first voltage signal is greater than a third preset value U3, generating a pulse signal with a third duty ratio. The preset value and the specific value of the duty ratio may be set according to user requirements, which is not limited in this embodiment.
The input voltage adjusting circuit 200 is configured to adjust an input power according to a control signal to charge the capacitor 300 to be charged.
It should be noted that the input power source may be an ac power source or a dc power source, and the input voltage adjusting circuit 200 adjusts the input power source to obtain a charging voltage meeting an expected value, so as to charge the capacitor to be charged.
It should be noted that the adjustment of the input power source may be to adjust the magnitude of the charging voltage. For example, when the control signal is a pulse signal with a first duty ratio, the input power supply is regulated to V1; when the control signal is a pulse signal with a second duty ratio, regulating the input power supply to be V2; when the control signal is a pulse signal with a third duty ratio, the input power supply is regulated to V3. The charging voltage of the capacitor 300 to be charged can be gradually reduced when the voltage value or ripple voltage at the two ends of the capacitor 300 to be charged is too large, so that the abnormal condition of the capacitor 300 to be charged is avoided, and the service life is prolonged.
In a first embodiment, a capacitor charging control circuit comprises a microprocessor, an input voltage regulating circuit, a capacitor to be charged and a voltage detection circuit; the voltage detection circuit converts the charging voltage at two ends of the capacitor to be charged into a first voltage signal and transmits the first voltage signal to the microprocessor; the microprocessor generates a first control signal according to the first voltage signal and transmits the first control signal to the input voltage regulating circuit; the input voltage adjusting circuit adjusts the input power supply according to the control signal so as to charge the capacitor to be charged. The utility model discloses a detect the charging voltage of charging capacitor to confirm the charging condition of charging capacitor, thereby adjust the voltage value of charging capacitor, in order to improve charging capacitor's life.
Referring to fig. 2, fig. 2 is a schematic circuit structure diagram of a second embodiment of the capacitor charging control circuit of the present invention. Based on the above first embodiment, the present invention is provided as a second embodiment.
In the second embodiment, the capacitance charging control circuit further includes a current detection circuit 500; the input terminal of the current detection circuit 500 is connected to the input voltage regulating circuit 200, and the output terminal of the current detection circuit 500 is connected to the second input terminal of the microprocessor 100.
The current detection circuit 500 is configured to collect a loop current of the input voltage regulating circuit 200, generate a current signal according to the loop current, and transmit the current signal to the microprocessor 100.
It should be noted that the loop current of the input voltage regulating circuit 200 also affects the lifetime of the capacitor to be charged, and in order to determine the charging condition of the capacitor to be charged more accurately, the current detecting circuit 500 is provided in the present embodiment to detect the loop current.
The microprocessor 100 is further configured to generate a second control signal according to the current signal and the first voltage signal, and transmit the second control signal to the input voltage regulating circuit 200.
It should be noted that the second control signal may be a pulse signal, and the microprocessor 100 may generate pulse signals with different duty ratios according to the current signal and the first voltage signal. For example, when the current signal is greater than a preset current threshold, determining whether a voltage value or ripple voltage corresponding to the first voltage signal is greater than a threshold, and if the voltage value or ripple voltage is greater than a first preset value U1, generating a pulse signal with a first duty ratio; if the duty ratio is larger than a second preset value U2, generating a pulse signal with a second duty ratio; and if the duty ratio is larger than the third preset value U3, generating a pulse signal with a third duty ratio. The specific values of the preset current threshold, the preset value and the duty ratio can be set according to user requirements, which is not limited in this embodiment.
In the second embodiment, the input voltage adjusting circuit 200 includes a power supply converting circuit 2001 and a voltage adjusting circuit 2002, an input terminal of the power supply converting circuit 2001 is connected to an input power supply, an output terminal of the power supply converting circuit 2001 is connected to an input terminal of the voltage adjusting circuit 2002, and an output terminal of the voltage adjusting circuit 2002 is connected to the capacitor 300 to be charged.
A power conversion circuit 2001 for converting an input power into a charging voltage.
It should be noted that the input power source may be an ac power source, and the input voltage adjusting circuit 200 adjusts the input power source to obtain a charging voltage meeting an expected value, so as to charge the capacitor to be charged.
In specific implementation, the power conversion circuit 2001 includes an electromagnetic interference filter circuit 20011 and a rectifier bridge 20012, an input end of the electromagnetic interference filter circuit 20011 is connected to the ac input power supply, an output end of the electromagnetic interference filter circuit 20011 is connected to an input end of the rectifier bridge 20012, and an output end of the rectifier bridge 20012 is connected to an input end of the voltage regulation circuit 2002.
It can be understood that, in order to ensure the stability of the ac input power, the ac input power is filtered and rectified by the rectifying bridge 20012 to obtain dc power for charging the capacitor 300 to be charged.
And the voltage regulating circuit 2002 is configured to regulate a charging voltage according to the control signal, so as to charge the capacitor to be charged.
It should be noted that, the adjustment of the charging voltage may be to adjust the magnitude of the charging voltage, and the specific adjustment manner may refer to the first embodiment.
In the second embodiment, in order to further accurately determine the charging condition of the capacitor to be charged, the capacitor charging control circuit further includes an ac voltage detection circuit 600, an input terminal of the ac voltage detection circuit 600 is connected to an output terminal of the power conversion circuit 2001, and an output terminal of the ac voltage detection circuit 600 is connected to a second input terminal of the microprocessor 100; the alternating voltage detection circuit 600 is configured to collect an output voltage of the power conversion circuit, generate a second voltage signal according to the output voltage, and transmit the second voltage signal to the microprocessor 100; the microprocessor 100 is further configured to generate a third control signal according to the first voltage signal and the second voltage signal, and transmit the third control signal to the input voltage adjusting circuit.
It should be noted that the third control signal may be a pulse signal, and the microprocessor 100 may generate pulse signals with different duty ratios according to the current signal and the first voltage signal. For example, when the first voltage signal is greater than a preset voltage threshold, determining whether a voltage value or ripple voltage corresponding to the first voltage signal is greater than the threshold; or when the first voltage signal is greater than the preset voltage threshold and the current signal is greater than the preset current threshold, determining whether the voltage value or the ripple voltage corresponding to the first voltage signal is greater than the threshold. The first voltage signal can be determined as described above.
In the second embodiment, the charging condition of the capacitor with the charging function is judged according to the current value and the first voltage signal by detecting the loop current, so that the charging voltage is controlled more accurately; the voltage condition of an input power supply can be considered, so that the charging voltage can be accurately controlled, and the service life of the capacitor to be charged is prolonged.
Referring to fig. 3, fig. 3 is a schematic diagram of a circuit structure of the power factor correction circuit of the present invention.
In the third embodiment, the power factor correction circuit is constructed on the basis of the capacitance charge control circuit. Meanwhile, a specific circuit structure of each part of the capacitor charging control circuit is provided. Of course, the specific circuit structure of each part of the capacitor charging control circuit is not limited to the power factor correction circuit, and can also be applied to other circuits including the capacitor charging control circuit.
As shown in fig. 3, the power factor correction circuit includes a tenth resistor R10, and the capacitor to be charged is an electrolytic capacitor; the first end of the tenth resistor R10 is connected with the anode of the electrolytic capacitor, the second end of the tenth resistor R10 is connected with the cathode of the electrolytic capacitor, the cathode of the electrolytic capacitor is grounded, and the anode of the electrolytic capacitor is connected with the voltage output port DC; the voltage output port DT is used to supply an output voltage to the outside.
It should be noted that, in the power factor correction circuit, the capacity of the electrolytic capacitor for storing and supplying the electric energy is reduced due to the excessive ripple current, and the like, and at this time, if the voltage is still maintained, the charging time needs to be increased or the charging speed needs to be increased. However, increasing the charging time period leads to further increase of ripple current, which in turn leads to further decrease of capacity, forming vicious cycles, thereby affecting the service life of the electrolytic capacitor, resulting in after-market failures. Secondly, under the condition of applying the same terminal voltage, the ripple current coefficient of the electrolytic capacitor increases along with the increase of the charging and discharging frequency, that is, if the output voltage is kept unchanged, the charging and discharging speed of the electrolytic capacitor needs to be increased, and the ripple current coefficient increases along with the increase of the charging and discharging frequency, so that the ripple current of the electrolytic capacitor also increases, the capacity of the electrolytic capacitor is reduced, the service life of the electrolytic capacitor is also influenced, and faults are caused.
In the present embodiment, the voltage detection circuit 400 includes: a first resistor R1, a second resistor R2, a third resistor R3, a first diode D1, a second diode D2 and a first capacitor C1; the first end of the first resistor R1 is connected to the capacitor 300 to be charged, the second end of the first resistor R1 is connected to the first end of the second resistor R2, the second end of the second resistor R2 is grounded, the cathode of the first diode D1 is connected to the predetermined power VCC, the anode of the first diode D1 is connected to the second end of the first resistor R1, the first end of the third resistor R3 and the cathode of the second diode D2, the anode of the second diode D2 is grounded, the second end of the third resistor R3 is connected to the first end of the first capacitor C1 and the first input end of the microprocessor 100, and the second end of the first capacitor C1 is grounded.
It should be noted that the voltage of the predetermined power source may be 3.3V, and the first diode D1 and the second diode D2 form a clamping diode pair, so that the voltage between the two diodes can be maintained between 0V and 3.3V, thereby preventing the voltage of the first voltage signal from being too high.
In this embodiment, the voltage regulating circuit 2002 includes a second capacitor C2, an inductor L, a third diode D3, and an insulated gate bipolar transistor IGBT; a first end of the second capacitor C2 is connected to the positive output end of the power conversion circuit 2001, and a second end of the second capacitor C2 is connected to the negative output end of the power conversion circuit 2001; the first end of the inductor L is connected with the first end of the second capacitor C2, the second end of the inductor L is connected with the anode of the third diode D3, the cathode of the third diode D3 is connected with the first end of the capacitor 300 to be charged, the collector of the insulated gate bipolar transistor IGBT is connected with the second end of the inductor L, the emitter of the insulated gate bipolar transistor IGBT is respectively connected with the second end of the second capacitor C2 and the second end of the capacitor 300 to be charged, and the gate of the insulated gate bipolar transistor IGBT is connected with the output end of the microprocessor 100.
It will be appreciated that the control signal output by the microprocessor 100 is applied to the gate of the insulated gate bipolar transistor IGBT to control the turn-off of the insulated gate bipolar transistor IGBT. The control signal is a pulse signal, and the output voltage output by the voltage output port DT is adjusted by adjusting the duty ratio of the pulse signal.
In this embodiment, the input voltage regulating circuit 2002 includes a sampling resistor RS. Referring to fig. 4, fig. 4 is a schematic circuit structure diagram of the current detection circuit, and as shown in fig. 4, the current detection circuit 50 includes: the circuit comprises an amplifier A, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and a ninth resistor R9; a first end of the sampling resistor RS is connected to a first end of the fourth resistor R4, a second end of the fourth resistor R4 is connected to an inverting input terminal of the amplifier a, a second end of the sampling resistor RS is connected to a first end of the fifth resistor R5, a second end of the fifth resistor R5 is connected to a first end of the sixth resistor R6 and a non-inverting input terminal of the amplifier a, a second end of the sixth resistor R6 is connected to the predetermined power VCC, a first end of the seventh resistor R7 is connected to the inverting input terminal of the amplifier a, a second end of the seventh resistor R7 is connected to an output terminal of the amplifier a and a first end of the eighth resistor R8, a second end of the eighth resistor R8 is grounded, a first end of the ninth resistor R9 is connected to a second end of the eighth resistor R8, and a second end of the ninth resistor R9 is connected to the microprocessor 100.
It should be noted that, on the premise that the equivalent resistance of the electrolytic capacitor is fixed, the ripple voltage of the output voltage is proportional to the ripple current, so the ripple voltage of the output bus voltage in this embodiment can reflect the variation of the ripple current, and the first embodiment or the second embodiment can be referred to for the determination of the ripple voltage and the generation process of the corresponding control signal.
In this embodiment, a power factor correction circuit is constructed based on the capacitor charging control circuit, and the output voltage and the loop current are detected to adjust the output voltage, so that the influence of an excessive ripple current on the electrolytic capacitor is avoided, and the service life of the electrolytic capacitor is prolonged.
In order to achieve the above object, the present invention further provides an air conditioner, which includes the power factor correction circuit as described above. Since the air conditioner adopts all technical solutions of all the embodiments, at least all the beneficial effects brought by the technical solutions of the embodiments are achieved, and no further description is given here.
The above is only the preferred embodiment of the present invention, and not the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings or the direct or indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. A capacitive charge control circuit, comprising: the device comprises a microprocessor, an input voltage regulating circuit, a capacitor to be charged and a voltage detection circuit; wherein,
the input end of the input voltage regulating circuit is connected with an input power supply, the output end of the input voltage regulating circuit is connected with the capacitor to be charged, the input end of the voltage detection circuit is connected with the capacitor to be charged, the output end of the voltage detection circuit is connected with the first input end of the microprocessor, and the output end of the microprocessor is connected with the control end of the input voltage regulating circuit;
the voltage detection circuit is used for converting the charging voltage at two ends of the capacitor to be charged into a first voltage signal and transmitting the first voltage signal to the microprocessor;
the microprocessor is used for generating a first control signal according to the first voltage signal and transmitting the first control signal to the input voltage regulating circuit;
and the input voltage regulating circuit is used for regulating the input power supply according to the control signal so as to charge the capacitor to be charged.
2. The capacitive charge control circuit of claim 1 wherein the voltage detection circuit comprises: the circuit comprises a first resistor, a second resistor, a third resistor, a first diode, a second diode and a first capacitor; wherein,
the first end of the first resistor is connected with the capacitor to be charged, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is grounded, the cathode of the first diode is connected with a preset power supply, the anode of the first diode is respectively connected with the second end of the first resistor, the first end of the third resistor and the cathode of the second diode, the anode of the second diode is grounded, the second end of the third resistor is respectively connected with the first end of the first capacitor and the first input end of the microprocessor, and the second end of the first capacitor is grounded.
3. The capacitive charge control circuit of claim 1 further comprising a current sense circuit; the input end of the current detection circuit is connected with the input voltage regulation circuit, and the output end of the current detection circuit is connected with the second input end of the microprocessor;
the current detection circuit is used for collecting the loop current of the input voltage regulating circuit, generating a current signal according to the loop current and transmitting the current signal to the microprocessor;
the microprocessor is further configured to generate a second control signal according to the current signal and the first voltage signal, and transmit the second control signal to the input voltage regulating circuit.
4. The capacitive charge control circuit of claim 3 wherein the input voltage regulation circuit comprises a sampling resistor, the current sense circuit comprising: the circuit comprises an amplifier, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor and a ninth resistor; wherein;
the first end of sampling resistance with the first end of fourth resistance is connected, the second end of fourth resistance with the inverting input end of amplifier is connected, the second end of sampling resistance with the first end of fifth resistance is connected, the second end of fifth resistance respectively with the first end of sixth resistance reaches the non-inverting input end of amplifier is connected, the second end of sixth resistance is connected with predetermineeing the power, the first end of seventh resistance with the inverting input end of amplifier is connected, the second end of seventh resistance respectively with the output of amplifier reaches the first end of eighth resistance is connected, the second end ground connection of eighth resistance, the first end of ninth resistance with the second end of eighth resistance is connected, the second end of ninth resistance with microprocessor connects.
5. The capacitance charge control circuit according to any one of claims 1-4, wherein the input voltage regulation circuit comprises a power conversion circuit and a voltage regulation circuit, an input terminal of the power conversion circuit is connected with an input power source, an output terminal of the power conversion circuit is connected with an input terminal of the voltage regulation circuit, and an output terminal of the voltage regulation circuit is connected with the capacitance to be charged;
the power supply conversion circuit is used for converting an input power supply into a charging voltage;
and the voltage regulating circuit is used for regulating the charging voltage according to the control signal so as to charge the capacitor to be charged.
6. The capacitive charge control circuit of claim 5 wherein the voltage regulation circuit comprises a second capacitor, an inductor, a third diode, and an insulated gate bipolar transistor; wherein,
the first end of the second capacitor is connected with the positive output end of the power supply conversion circuit, and the second end of the second capacitor is connected with the negative output end of the power supply conversion circuit; the first end of the inductor is connected with the first end of the second capacitor, the second end of the inductor is connected with the anode of the third diode, the cathode of the third diode is connected with the first end of the capacitor to be charged, the collector of the insulated gate bipolar transistor is connected with the second end of the inductor, the emitter of the insulated gate bipolar transistor is connected with the second end of the second capacitor and the second end of the capacitor to be charged respectively, and the grid of the insulated gate bipolar transistor is connected with the output end of the microprocessor.
7. The capacitive charge control circuit of claim 5 wherein the input power source is an ac input power source, the power conversion circuit comprises an emi filter circuit and a rectifier bridge, an input of the emi filter circuit is connected to the ac input power source, an output of the emi filter circuit is connected to an input of the rectifier bridge, and an output of the rectifier bridge is connected to an input of the voltage regulator circuit.
8. The capacitive charge control circuit of claim 5 further comprising an ac voltage detection circuit having an input connected to the output of the power conversion circuit and an output connected to a second input of the microprocessor;
the alternating voltage detection circuit is used for collecting the output voltage of the power supply conversion circuit, generating a second voltage signal according to the output voltage and transmitting the second voltage signal to the microprocessor;
the microprocessor is further configured to generate a third control signal according to the first voltage signal and the second voltage signal, and transmit the third control signal to the input voltage adjusting circuit.
9. A power factor correction circuit, comprising a tenth resistor and the capacitor charge control circuit of any of claims 1-8, wherein the capacitor to be charged is an electrolytic capacitor; wherein,
a first end of the tenth resistor is connected with the anode of the electrolytic capacitor, a second end of the tenth resistor is connected with the cathode of the electrolytic capacitor, the cathode of the electrolytic capacitor is grounded, and the anode of the electrolytic capacitor is connected with a voltage output port;
the voltage output port is used for providing output voltage to the outside.
10. An air conditioner characterized by comprising the power factor correction circuit as claimed in claim 9.
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| CN202023203651.0U CN214850518U (en) | 2020-12-25 | 2020-12-25 | Capacitor charging control circuit, power factor correction circuit and air conditioner |
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| CN202023203651.0U CN214850518U (en) | 2020-12-25 | 2020-12-25 | Capacitor charging control circuit, power factor correction circuit and air conditioner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114268151A (en) * | 2021-12-24 | 2022-04-01 | 苏州汇川控制技术有限公司 | Charging circuit, device and method for standby power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114268151A (en) * | 2021-12-24 | 2022-04-01 | 苏州汇川控制技术有限公司 | Charging circuit, device and method for standby power supply |
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