CN217508618U - AC-DC converter with self-driven thyristor circuit - Google Patents
AC-DC converter with self-driven thyristor circuit Download PDFInfo
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- CN217508618U CN217508618U CN202221140963.8U CN202221140963U CN217508618U CN 217508618 U CN217508618 U CN 217508618U CN 202221140963 U CN202221140963 U CN 202221140963U CN 217508618 U CN217508618 U CN 217508618U
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Abstract
The utility model discloses an AC-DC converter with a self-driven thyristor circuit, which comprises an AC input stage circuit and a DC output stage circuit, wherein the input stage circuit comprises an AC power supply, a rectifier bridge, a self-driven thyristor circuit and an RCD clamping circuit, and the output stage circuit comprises a flyback isolating circuit and a load, the utility model can rectify the sine alternating current of power frequency or other frequencies into direct current, reduce the volume of the converter and eliminate the fluctuation of output voltage by reducing the large capacitance capacity of the AC-DC converter, compared with the prior conversion circuit, the conversion circuit has simple structure, the input stage large capacitance is connected with the self-driven thyristor in series, controls the on-off of the thyristor by the large capacitance voltage and the output voltage of the rectifier bridge, thereby controlling the charging and discharging time of the large capacitance, reducing the large capacitance capacity, reducing the volume of the converter and realizing low ripple output, the RCD clamping circuit is used for recovering the leakage inductance energy of the transformer, reducing the voltage stress of the switch and improving the efficiency of the converter.
Description
Technical Field
The utility model relates to a power adapter technique especially relates to the appearance value of large capacity electric capacity reduces in electronic product power adapters such as cell-phone and notebook computer.
Background
With the continuous improvement of the charging power of electronic products such as mobile phones and notebook computers, the requirement on the charging efficiency is higher and higher. In order to improve charging efficiency and reduce power supply volume, the cost of the control device, and the charging power of 75W and below do not require a power adapter to carry out power factor correction. At present, the power factor of the power supply adapters of mainstream mobile phones and notebook computers, such as those of apple, Huashi and samsung mobile phones and notebook computers, is only about 0.5 at full load operation, and the output voltage ripple is generally varied from 100 millivolts to 200 millivolts. Because the power adapters of electronic products such as mobile phones and notebook computers need a large capacitance value of capacitor to smooth output voltage ripples, the high-voltage large-capacity capacitor may account for 40% of the total volume of the system, and how to reduce the volume of the power adapters of electronic products such as mobile phones and notebook computers is a problem that every power design engineer has to consider.
In the prior art, the power adapter of the main electronic products such as the mobile phone and the notebook computer has the characteristics of simple structure and stable output voltage, but the power adapter of the electronic products such as the mobile phone and the notebook computer in the market does not have the following functions: 1. the capacity of the large capacitor is reduced, meanwhile, the stability of the output voltage is maintained, and the size of the power adapter is reduced; 2. the power factor of the power adapter cannot be further improved, the influence of harmonic waves on a power grid cannot be reduced, the improvement is provided, and the power adapter of an AC-DC converter with a self-driven thyristor circuit is used for electronic products such as mobile phones and notebook computers.
Disclosure of Invention
The present invention is directed to overcome the above-mentioned drawbacks of the prior art and to provide an AC-DC converter with a self-driven thyristor circuit.
The purpose of the utility model can be realized through the following technical scheme:
an AC-DC converter introduced with a self-driven thyristor circuit comprises an alternating current input stage circuit and a direct current output stage circuit, wherein the input stage circuit comprises an alternating current power supply, a rectifier bridge, the self-driven thyristor circuit and an RCD clamping circuit, and the output stage circuit comprises a flyback isolation circuit and a load; the self-driven thyristor circuit comprises a Zener diode, a self-driven thyristor, a diode and a large capacitor, the RCD clamping circuit comprises a clamping resistor, a clamping capacitor and a clamping diode, the flyback isolation circuit comprises a flyback transformer, a switching tube, a rectifier diode and a filter capacitor, and the AC-DC converter introduced into the self-driven thyristor circuit is characterized in that the input end of the rectifier bridge is connected with the AC power supply.
Preferably, the cathode of the self-driven thyristor and the anode of the diode are connected with the upper end of the rectifier bridge, the anode of the zener diode is connected with the control end of the self-driven thyristor, the cathode of the zener diode is connected with the anode of the large capacitor, and the cathode of the large capacitor is connected with the lower end of the rectifier bridge.
Preferably, one end of the clamping resistor and the negative electrode of the clamping capacitor are connected to the anode of the diode and the cathode of the self-driven thyristor, and the other end of the clamping resistor and the positive electrode of the clamping capacitor are connected to the cathode of the clamping diode.
Preferably, one end of the flyback transformer is connected with the negative electrode of the clamping capacitor, the other end of the flyback transformer is connected with the drain electrode of the switching tube, the source electrode of the switching tube is connected with the lower end of the rectifier bridge and the negative electrode of the large capacitor, the anode of the rectifier diode is connected with the upper end of the secondary side of the flyback transformer, the cathode of the rectifier diode is connected with the anode of the filter capacitor, and the negative electrode of the filter capacitor is connected with the lower end of the secondary side of the flyback transformer.
Preferably, the output end of the filter capacitor is connected with the load.
Compared with the prior art, the utility model has the advantages of it is following:
1. the self-driven thyristor controls the discharge of the large capacitor, the discharge time of the output voltage of the rectifier bridge is prolonged, the capacity of the large capacitor is reduced on the basis of maintaining the output voltage ripple unchanged, and the size of the whole system is further reduced.
2. The control mode is simple, the thyristor is conducted by bearing a back pressure threshold value through the Zener diode, the on-off is automatically realized, and only one switching tube needs to be controlled to be on or off.
3. The structure is simple, and on the basis of reducing the capacitance value of the large capacitor, the power factor of the system is further improved, and the influence of harmonic waves on a power grid is reduced.
Drawings
Fig. 1 is a schematic structural diagram of an AC-DC converter incorporating a self-driven thyristor circuit according to the present invention;
fig. 2 is a schematic structural diagram of a conventional power adapter before the converter of the present invention is modified;
fig. 3 is a schematic diagram of the equivalent structure and the voltage and current directions of the converter according to the present invention;
FIG. 4 is a comparison of waveforms approximating steady state operation of a converter of the present invention compared to a conventional power adapter prior to modification;
fig. 5 is a graph comparing the output voltage of the converter of the present invention with the output voltage of the conventional power adapter before the improvement.
The figure is marked with: 1. the circuit comprises an alternating current power supply, 2, a rectifier bridge, 3, a Zener diode, 4, a self-driven thyristor, 5, a diode, 6, a large capacitor, 7, a clamping resistor, 8, a clamping capacitor, 9, a clamping diode, 10, a flyback transformer, 11, a switching tube, 12, a rectifier diode, 13, a filter capacitor, 14 and a load.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific examples. This embodiment is implemented on the premise of the technical solution of the present invention, and lists specific implementation and detailed operation processes, and the protection scope of the present invention is not limited to the following embodiments.
Examples
As shown in fig. 1, an AC-DC converter incorporating a self-driven thyristor circuit includes an AC power supply 1, a rectifier bridge 2, a zener diode 3, a self-driven thyristor 4, a diode 5, a large capacitor 6, a clamping resistor 7, a clamping capacitor 8, a clamping diode 9, a flyback transformer 10, a switching tube 11, a rectifier diode 12, a filter capacitor 13, and a load 14, where the self-driven thyristor circuit includes the zener diode 3, the self-driven thyristor 4, the diode 5, and the large capacitor 6, the RCD clamping circuit includes the clamping resistor 7, the clamping capacitor 8, and the clamping diode 9, and the flyback isolation circuit includes the flyback transformer 10, the switching tube 11, and the rectifier diode 12. The flyback transformer 10 is equivalent to the excitation inductor L m Ideal flyback transformer and leakage inductance L r Form (1: n) 1 A specific equivalent circuit diagram of the turn ratio of the primary winding and the secondary winding of the flyback transformer 10 is shown in fig. 3.
The principle analysis is carried out on the equivalent circuit diagrams shown in fig. 2 and fig. 3, and the maximum rectified voltage V output by the rectifier bridge 2 before and after the improvement is ensured g_max And a minimum rectified voltage V g_min Consistently, the approximate waveform contrast diagram of the AC-DC converter steady state operation with the self-driven thyristor circuit introduced can be obtained as shown in FIG. 4, and the circuit of the present invention is operated in a switching period T S The internal working condition is divided into three working modes which are respectively as follows: i operating mode (t) 0 -t 1 ) II working mode (t) 1 -t 2 ) And III working mode (t) 2 -t 3 ) As shown in FIG. 4, the waveform V of the rectifier bridge 2 with the self-driven thyristor is depicted by solid lines g Self-driven thyristor large capacitor 6 charging and discharging waveform V C Control signal g of the self-driven thyristor 4 1 And the current waveform i flowing through the self-driven thyristor 4 SCR In a switching period T S Different variations in the case of; dotted lines depict the rectifier bridge 2 waveform V of a conventional power adapter without a self-driven thyristor g1 I.e. the charging and discharging waveform V of the large capacitor 6 before improvement C1 。
Right the AC-DC converter operating principle of introducing self-driven thyristor circuit carries out concrete analysis: the first stepAs mode (t) 0 -t 1 ) Output voltage V of rectifier bridge 2 g The large capacitor 6 is charged through the diode 5 until the voltage of the large capacitor 6 is equal to the output voltage V of the rectifier bridge 2 g Maximum value of (V) g_max When the charging is finished, the charging state of the I-th working mode is the same as that of the traditional power adapter; II mode of operation (t) 1 -t 2 ) When the rectifier bridge 2 outputs a voltage V g When the voltage drops below the maximum value, the Zener diode 3 and the diode 5 are in reverse bias, the energy of the large capacitor 6 is ensured not to be released to the load 14, and the output voltage V of the rectifier bridge 2 is at the moment g The power supply to the load 14 is continued, and the output voltage V of the rectifier bridge 2 is increased compared with the conventional power adapter g The charging time of the load 14 is shortened, the charging time of the large capacitor 6 to the load 14 is shortened, so that the capacity of the large capacitor 6 is reduced, and the size of the converter is reduced, wherein the capacitor discharging time of the traditional power adapter is as follows:
the size of the capacitor of the conventional power adapter is as follows:
wherein, P o To output power, f line For the alternating-current input voltage frequency, the improved capacitor discharge time is as follows:
the improved capacitor size is as follows:
the capacitance reduction rate η can be expressed as:
III operating mode (t) 2 -t 3 ) When the voltage of the large capacitor 6 and the output voltage V of the rectifier bridge 2 g When the voltage difference reaches the reverse breakdown voltage of the Zener diode 3, the breakdown current of the Zener diode 3 is connected with the self-driven thyristor 4, the large capacitor 6 is connected into the circuit to supply power for the load 14, the Zener diode 3 recovers reverse blocking, the self-driven thyristor 4 is kept conducted until the voltage of the large capacitor 6 is reduced to the output voltage V of the rectifier bridge 2 g Minimum value of (V) g_min Time, rectifier bridge output voltage V g And (5) recovering control, naturally closing the self-driven thyristor 4 and completing a cycle.
Setting test conditions: the effective value of the input voltage is 90V, and the frequency f line 50HZ, output voltage 24V, output power 60W, flyback transformer 10 turns ratio is 38:10, big electric capacity 6 sets up to 88u and 56u respectively before improving, obtains the utility model discloses an introduce the AC-DC converter waveform of self-driven thyristor circuit as shown in fig. 4 and 5, under the prerequisite of guaranteeing that power and output voltage ripple are unchangeable basically, big electric capacity 6 reduces to 56u from 88u, and the power factor promotes to 0.76 from 0.58, and the converter volume can reduce 30%.
According to above analysis can know, the utility model provides an introduce AC-DC converter from driving thyristor circuit can the steady output direct current voltage, effectively suppresses the output voltage ripple, and the output voltage ripple keeps about 100mv to reduce the converter volume, improve converter power factor, RCD clamp circuit has solved the big problem that just has the voltage peak of switch tube 11 voltage stress simultaneously, can retrieve the transformer leakage inductance energy simultaneously, further improve the whole efficiency of converter.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way; the utility model can be smoothly implemented by the ordinary technicians in the industry according to the drawings and the above description; however, those skilled in the art should understand that changes, modifications and variations made by the above-described technology can be made without departing from the scope of the present invention, and all such changes, modifications and variations are equivalent embodiments of the present invention; meanwhile, any changes, modifications, evolutions, etc. of the above embodiments, which are equivalent to the actual techniques of the present invention, still belong to the protection scope of the technical solution of the present invention.
Claims (5)
1. An AC-DC converter with self-driven thyristor circuit comprises an AC input stage circuit and a DC output stage circuit, the input stage circuit comprises an alternating current power supply (1), a rectifier bridge (2), a self-driven thyristor circuit and an RCD clamping circuit, the output stage circuit comprises a flyback isolation circuit and a load (14), the self-driven thyristor circuit comprises a Zener diode (3), a self-driven thyristor (4), a diode (5) and a large capacitor (6), the RCD clamping circuit comprises a clamping resistor (7), a clamping capacitor (8) and a clamping diode (9), the flyback isolation circuit comprises a flyback transformer (10), a switching tube (11), a rectifier diode (12) and a filter capacitor (13), the AC-DC converter introduced into a self-driven thyristor circuit, the rectifier is characterized in that the input end of the rectifier bridge (2) is connected with the alternating current power supply (1).
2. An AC-DC converter incorporating a self-driven thyristor circuit according to claim 1, characterized in that the cathode of the self-driven thyristor (4) and the anode of the diode (5) are connected to the upper end of the rectifier bridge (2), the anode of the zener diode (3) is connected to the control terminal of the self-driven thyristor (4), the cathode of the zener diode (3) is connected to the anode of the large capacitor (6), and the cathode of the large capacitor (6) is connected to the lower end of the rectifier bridge (2).
3. An AC-DC converter incorporating a self-driven thyristor circuit according to claim 1, characterized in that one end of the clamping resistor (7) and the negative pole of the clamping capacitor (8) are connected to the anode of the diode (5) and the cathode of the self-driven thyristor (4), and the other end and the positive pole of the clamping capacitor (8) are connected to the cathode of the clamping diode (9).
4. The AC-DC converter introduced with the self-driven thyristor circuit is characterized in that one end of the flyback transformer (10) is connected with the negative electrode of the clamping capacitor (8), the other end of the flyback transformer is connected with the drain electrode of the switching tube (11), the source electrode of the switching tube (11) is connected with the lower end of the rectifier bridge (2) and the negative electrode of the large capacitor (6), the anode of the rectifier diode (12) is connected with the upper end of the secondary side of the flyback transformer (10), the cathode of the rectifier diode is connected with the positive electrode of the filter capacitor (13), and the negative electrode of the filter capacitor (13) is connected with the lower end of the secondary side of the flyback transformer (10).
5. An AC-DC converter incorporating a self-driven thyristor circuit according to claim 1, characterized in that the filter capacitor (13) output is connected to the load (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221140963.8U CN217508618U (en) | 2022-05-11 | 2022-05-11 | AC-DC converter with self-driven thyristor circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221140963.8U CN217508618U (en) | 2022-05-11 | 2022-05-11 | AC-DC converter with self-driven thyristor circuit |
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| Publication Number | Publication Date |
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| CN217508618U true CN217508618U (en) | 2022-09-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221140963.8U Expired - Fee Related CN217508618U (en) | 2022-05-11 | 2022-05-11 | AC-DC converter with self-driven thyristor circuit |
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|---|---|
| CN (1) | CN217508618U (en) |
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- 2022-05-11 CN CN202221140963.8U patent/CN217508618U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220927 |