CN215817929U - Primary side feedback RCC circuit - Google Patents
Primary side feedback RCC circuit Download PDFInfo
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- CN215817929U CN215817929U CN202121404753.0U CN202121404753U CN215817929U CN 215817929 U CN215817929 U CN 215817929U CN 202121404753 U CN202121404753 U CN 202121404753U CN 215817929 U CN215817929 U CN 215817929U
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Abstract
The utility model discloses a primary side feedback RCC circuit, which comprises: the transformer module comprises a primary coil, a secondary coil and an auxiliary coil, and the primary coil, the secondary coil and the auxiliary coil are coupled with each other; the first switching tube is connected with the primary coil; the control module is connected with the control end of the first switch tube; and the first feedback module is connected with the auxiliary coil to detect the voltage of the secondary coil and is connected with the control module. The first feedback module is connected with the auxiliary coil, the voltage of the secondary coil is detected to form a first feedback signal according to the voltage of the auxiliary coil, the first feedback signal is transmitted to the control module, the control module controls the on-off state or the conduction degree state of the first switch tube according to the first feedback signal to adjust the current of the primary coil, the output current of the secondary coil can be adjusted, the output current can be adjusted according to the output voltage, and the effect that the output current is more stable is achieved.
Description
Technical Field
The utility model relates to an RCC circuit, in particular to a primary side feedback RCC circuit.
Background
The RCC (self-oscillation flyback) circuit has the advantages of simple structure, high efficiency and the like. The RCC circuit generally includes a transformer, a switching tube, a diode, an energy storage capacitor, and an auxiliary element, the transformer includes a primary coil, a secondary coil, and an auxiliary coil coupled to each other, one end of the primary coil is connected to an input voltage, the other end of the primary coil is connected to the switching tube, the secondary coil is connected to the diode and the capacitor to supply power to a load, and the auxiliary coil is connected to a control end of the switching tube through the auxiliary element.
When the switch tube is switched off, the current of the primary coil is reduced sharply, the secondary coil generates reverse induced voltage to enable the diode to be switched on and generate induced current to supply power to the load, and the induced current also charges the energy storage capacitor to supplement the electric energy. The switching tube is periodically switched on and off, and the process is repeated to realize power supply to the load.
The photoelectric coupler is commonly used in the prior art to detect the voltage or the power signal of the secondary coil side, and the photoelectric coupler feeds the detection signal back to the control end of the switch tube to control the working state of the switch tube, so that the output current transmitted from the secondary coil to a load is more stable. However, this structure of acquiring the feedback signal from the secondary coil affects the output voltage, current, and the circuit is complicated.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides a primary side feedback RCC circuit which can be connected with an auxiliary coil through a first feedback module to detect the output voltage of a secondary coil to form a first feedback signal, and is not required to be directly connected with the secondary coil for detection, so that the circuit structure is simplified.
According to the utility model, the primary side feedback RCC circuit comprises: a transformer module including a primary coil, a secondary coil, and an auxiliary coil, the primary coil, the secondary coil, and the auxiliary coil being coupled to one another; the first switching tube is connected with the primary coil; the control module is connected with the control end of the first switch tube; and the first feedback module is connected with the auxiliary coil to detect the voltage of the secondary coil, and the first feedback module is connected with the control module.
The primary side feedback RCC circuit provided by the embodiment of the utility model has the following beneficial effects: the secondary coil and the auxiliary coil are coupled with each other, namely the voltage of the secondary coil is related to the voltage of the auxiliary coil, the first feedback module is connected with the auxiliary coil, the voltage of the secondary coil can be obtained according to the voltage detection of the auxiliary coil to form a first feedback signal, the first feedback signal is transmitted to the control module, the control module controls the on-off state or the conducting degree state of the first switching tube according to the first feedback signal to adjust the current of the primary coil, the output current of the secondary coil can be adjusted, the output current can be adjusted according to the output voltage, and the effect of enabling the output current to be more stable is achieved. Meanwhile, the feedback signal does not need to be directly connected with the secondary coil, so that the influence on the output voltage and current of the secondary coil is reduced, and the circuit is simplified.
According to some embodiments of the utility model, the secondary winding further comprises a second feedback module connected to the auxiliary winding to detect the voltage of the primary winding, the second feedback module being connected to the control module.
According to some embodiments of the present invention, the control module includes a second switch tube, one end of the second switch tube is connected to the control end of the first switch tube, the other end of the second switch tube is grounded, and the first feedback module and the second feedback module are both connected to the control end of the second switch tube.
According to some embodiments of the present invention, the first feedback module includes a diode D4, a capacitor C5, and a resistor R8, wherein a dotted terminal of the primary winding is connected to a power supply terminal, a cathode of the diode D4 is connected to a dotted terminal of the auxiliary winding, an anode of the diode D4 is connected to one terminal of the capacitor C5 and one terminal of the resistor R8, respectively, another terminal of the resistor R8 is connected to a control terminal of the second switch, and another terminal of the capacitor C5 is connected to a dotted terminal of the auxiliary winding.
According to some embodiments of the present invention, the second feedback module includes a resistor R5, one end of the resistor R5 is connected to the dotted terminal of the auxiliary winding, and the other end of the resistor R5 is connected to the control terminal of the second switch tube.
According to some embodiments of the present invention, the auxiliary winding further includes a capacitor C4, a resistor R4, and a voltage regulator tube D5, one end of the capacitor C4 is connected to the dotted terminal of the auxiliary winding, the other end of the capacitor C4 is connected to one end of the resistor R4, the other end of the resistor R4 is connected to the cathode of the voltage regulator tube D5 and the control terminal of the first switch tube, and the anode of the voltage regulator tube D5 is connected to the anode of the diode D4 and one end of the capacitor C5.
According to some embodiments of the utility model, the current limiting circuit further comprises an overcurrent protection module, the overcurrent protection module is respectively connected with the control ends of the first switch tube and the second switch tube, and the overcurrent protection module can reduce the on-off frequency of the first switch tube when the current of the first switch tube exceeds a threshold value.
According to some embodiments of the present invention, the overcurrent protection module includes a resistor R7 and a resistor R9, one end of the resistor R7 is connected to one end of the first switching tube and one end of the resistor R9, the other end of the resistor R7 is connected to the control end of the second switching tube, and the other end of the resistor R9 is grounded.
According to some embodiments of the present invention, the switch further includes a resistor R6, one end of the resistor R6 is connected to the other end of the resistor R7 and the other end of the resistor R8, and the other end of the resistor R6 is connected to the other end of the resistor R5 and the control end of the second switch tube.
According to some embodiments of the utility model, the transformer further comprises a rectifying and filtering module, wherein the rectifying and filtering module is connected with the same-name end of the primary coil.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a circuit diagram of one embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, if there are first and second described only for the purpose of distinguishing technical features, it is not understood that relative importance is indicated or implied or that the number of indicated technical features or the precedence of the indicated technical features is implicitly indicated or implied.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
As shown in fig. 1, a primary side feedback RCC circuit according to an embodiment of the present invention includes: a transformer module 100, the transformer module 100 including a primary coil 110, a secondary coil 120, and an auxiliary coil 130, the primary coil 110, the secondary coil 120, and the auxiliary coil 130 being coupled to each other; a first switching tube 200 connected to the primary coil 110; a control module 300 connected to a control end of the first switch tube 200; a first feedback module 400 connected to the auxiliary winding 130 to detect the voltage of the secondary winding 120, wherein the first feedback module 400 is connected to the control module 300.
Since the secondary coil 120 and the auxiliary coil 130 are coupled with each other, that is, the voltage of the secondary coil 120 is related to the voltage of the auxiliary coil 130, the first feedback module 400 is connected to the auxiliary coil 130, the voltage of the secondary coil 120 can be obtained according to the voltage detection of the auxiliary coil 130 to form a first feedback signal, the first feedback signal is transmitted to the control module 300, and the control module 300 controls the on-off or conduction state of the first switching tube 200 according to the first feedback signal to adjust the current of the primary coil 110, so as to adjust the magnitude of the output current of the secondary coil 120, which is beneficial to achieving the effect of adjusting the output current according to the output voltage and making the output current more stable. Meanwhile, the feedback signal does not need to be directly connected with the secondary coil 120, which is beneficial to reducing the influence on the output voltage and current of the secondary coil 120 and simplifying the circuit.
Referring to fig. 1, in some embodiments of the present invention, a second feedback module 500 is further included, the second feedback module 500 is connected to the auxiliary winding 130 to detect the voltage of the primary winding 110, and the second feedback module 500 is connected to the control module 300.
Because the primary coil 110 and the auxiliary coil 130 are coupled with each other and connected with the auxiliary coil 130 through the second feedback module 500, the voltage of the primary coil 110 can be detected according to the voltage of the auxiliary coil 130 to form a second feedback signal, the second feedback signal is transmitted to the control module 300, the control module 300 controls the on-off state or the conduction state of the first switching tube 200 according to the second feedback signal to adjust the current of the primary coil 110, and further adjust the magnitude of the output current of the secondary coil 120, which is beneficial to realizing the effect of adjusting the output current according to the input voltage and making the output current more stable.
The first feedback signal is matched with the second feedback signal, so that the first switch tube 200 can be correspondingly adjusted when the output voltage fluctuates and/or the input voltage fluctuates, the output current is more stable, and the reliability is improved.
The number of turns of the auxiliary coil 130 is reasonably set, so that the voltage and the current of the first feedback signal and the second feedback signal acquired when the first feedback module 400 and the second feedback module 500 perform detection are in a reasonable range.
Referring to fig. 1, in some embodiments of the present invention, the control module 300 includes a second switch tube 310, one end of the second switch tube 310 is connected to the control end of the first switch tube 200, the other end of the second switch tube 310 is grounded, and the first feedback module 400 and the second feedback module 500 are both connected to the control end of the second switch tube 310.
The first feedback module 400 and the second feedback module 500 are connected with the control end of the second switch tube 310 to control the on-off or conduction state of the second switch tube 310, and then the second switch tube 310 adjusts the voltage or current of the control end of the first switch tube 200, so that the effect of controlling the on-off or conduction state of the first switch tube 200 is realized, the structure is simple, and the implementation is convenient.
In some embodiments, the control module 300 may also be a device including a chip or a single chip, which can control the on/off state or the conduction state of the first switch tube 200 according to the first feedback signal and the second feedback signal.
The first feedback signal generated by the first feedback module 400 and the second feedback signal generated by the second feedback module 500 are mutually overlapped and input to the control end of the second switch tube 310, the first feedback signal can reflect the magnitude of the output voltage, the second feedback signal can reflect the magnitude of the input voltage, and the first feedback signal and the second feedback signal are overlapped and input to the control end of the second switch tube 310 to adjust the state of the first switch tube 200, so that the output current is more stable.
Referring to fig. 1, the diode D3 and the capacitor C3 are connected to the secondary winding 120, and when the first switch tube 200 is turned on, the diode D3 is turned off by the induced voltage generated by the secondary winding 120; when the first switch 200 is turned off, the diode D3 is turned on by the reverse induced voltage generated by the secondary winding 120, the secondary winding 120 generates an output current to transmit to the load and simultaneously charges the capacitor C3, and when the first switch 200 is turned on, the capacitor C3 releases the electric energy to maintain the current transmitted to the load.
Referring to fig. 1, in some embodiments of the present invention, the first feedback module 400 includes a diode D4, a capacitor C5, and a resistor R8, the dotted terminal of the primary winding 110 is connected to the power supply terminal, the cathode of the diode D4 is connected to the dotted terminal of the auxiliary winding 130, the anode of the diode D4 is connected to one terminal of the capacitor C5 and one terminal of the resistor R8, the other terminal of the resistor R8 is connected to the control terminal of the second switching tube 310, and the other terminal of the capacitor C5 is connected to the dotted terminal of the auxiliary winding 130.
When the first switch tube 200 is turned off and the secondary coil 120 generates the reverse induced voltage, the secondary coil 120 generates the output current, and the reverse induced voltage is the output voltage, so in order to detect the output voltage according to the auxiliary coil 130, attention should be paid to the time when the auxiliary coil 130 generates the reverse induced voltage. By providing the diode D4, the diode D4 is turned off when the auxiliary winding 130 generates a forward induced voltage, the diode D4 is turned on only when the auxiliary winding 130 generates a reverse induced voltage, and a detection voltage is formed on the capacitor C5, and the detection voltage forms a first feedback voltage through the resistor R8 and is transmitted to the control terminal of the second switching tube 310. Therefore, the purpose of detecting the output voltage according to the auxiliary coil 130 is achieved, and the structure is ingenious and simple and is convenient to implement.
Referring to fig. 1, in some embodiments of the present invention, the second feedback module 500 includes a resistor R5, one end of the resistor R5 is connected to the dotted terminal of the auxiliary winding 130, and the other end of the resistor R5 is connected to the control terminal of the second switching tube 310.
The forward induction voltage generated by the auxiliary coil 130 is related to the input voltage received by the primary coil 110, and therefore, the resistor R5 is connected with the same-name end of the auxiliary coil 130, so that a second feedback signal related to the input voltage can be simply and conveniently formed, and the structure is simple.
Referring to fig. 1, in some embodiments of the present invention, the present invention further includes a capacitor C4, a resistor R4, and a voltage regulator tube D5, one end of the capacitor C4 is connected to the dotted terminal of the auxiliary winding 130, the other end of the capacitor C4 is connected to one end of the resistor R4, the other end of the resistor R4 is connected to the cathode of the voltage regulator tube D5 and the control terminal of the first switch tube 200, and the anode of the voltage regulator tube D5 is connected to the anode of the diode D4 and one end of the capacitor C5.
The capacitor C4 and the resistor R4 can transmit the induced current generated by the auxiliary coil 130 to the control end of the first switch tube 200, so as to form positive feedback, which is beneficial to quickening the action of the first switch tube 200. Through being provided with stabilivolt D5, when output voltage risees, the reverse induction voltage that auxiliary coil 130 produced also increases, when stabilivolt D5 was punctured in the reverse direction, can draw down the control terminal voltage of first switch tube 200 for the conduction speed of the first switch tube 200 of next cycle slows down, makes the first switch tube 200 unit cycle in the time of switch on shorten, and then can reduce output voltage size, forms voltage negative feedback promptly, is favorable to making output voltage more stable, realizes the constant voltage function.
Referring to fig. 1, in some embodiments of the present invention, an overcurrent protection module 600 is further included, the overcurrent protection module 600 is respectively connected to the control ends of the first switching tube 200 and the second switching tube 310, and the overcurrent protection module 600 is capable of reducing the on-off frequency of the first switching tube 200 when the current of the first switching tube 200 exceeds a threshold value.
When the current flowing through the first switching tube 200 exceeds the threshold, a short circuit may occur, and the overcurrent protection module 600 reduces the on-off frequency of the first switching tube 200 to reduce the average voltage and current, thereby implementing a protection function.
Referring to fig. 1, in some embodiments of the present invention, the overcurrent protection module 600 includes a resistor R7 and a resistor R9, one end of the resistor R7 is connected to one end of the first switching tube 200 and one end of the resistor R9, the other end of the resistor R7 is connected to the control end of the second switching tube 310, and the other end of the resistor R9 is grounded.
The current flowing through the first switch tube 200 forms a voltage with a corresponding magnitude through the resistor R9, the voltage of the resistor R9 is obtained through the resistor R7 to form a protection feedback signal, and the protection feedback signal is transmitted to the control end of the second switch tube 310, and the protection feedback signal can reflect the magnitude of the current flowing through the first switch tube 200. When the current flowing through the first switch tube 200 exceeds the threshold, the second switch tube 310 is turned on, and the voltage at the control end of the first switch tube 200 is pulled down, so that the first switch tube 200 is turned off, and meanwhile, the capacitor C4 cannot induce zero-crossing oscillation to enable the first switch tube 200 to be rapidly turned on in the next period, and further, the first switch tube 200 can only obtain the on-state current through the starting resistor R1 to be reset and started, so that the effect of reducing the on-off frequency of the first switch tube 200 is realized, and the structure is simple and convenient to implement.
Referring to fig. 1, in some embodiments of the present invention, a resistor R6 is further included, one end of the resistor R6 is connected to the other end of the resistor R7 and the other end of the resistor R8, and the other end of the resistor R6 is connected to the other end of the resistor R5 and the control end of the second switching tube 310.
By providing the resistor R6, the influence of the first feedback signal input through the resistor R8 on the second switching tube 310 can be adjusted through the resistor R6. Meanwhile, the resistor R6 and the resistor R7 can also set the threshold value of the current flowing through the first switch tube 200.
Referring to fig. 1, in some embodiments of the present invention, a rectifying and filtering module 700 is further included, and the rectifying and filtering module 700 is connected to a same-name terminal of the primary coil 110.
By providing the rectifying and filtering module 700, the ac power input from the outside can be converted into a dc power according with the working requirement, and the input voltage to the primary coil 110 can be more stable, which is beneficial to improving the stability and reliability.
The rectifying and filtering module 700 may be an embodiment including a rectifying bridge and a filtering capacitor; the rectifying and filtering module 700 may also be implemented by other modules or circuits with rectifying and filtering functions.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The utility model is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the utility model, and such equivalent modifications or substitutions are included in the scope defined by the claims of the present application.
Claims (10)
1. A primary side feedback RCC circuit, comprising:
a transformer module (100), the transformer module (100) comprising a primary coil (110), a secondary coil (120), and an auxiliary coil (130), the primary coil (110), the secondary coil (120), and the auxiliary coil (130) being coupled to each other;
a first switching tube (200) connected to the primary coil (110);
the control module (300) is connected with the control end of the first switch tube (200);
a first feedback module (400) connected with the auxiliary coil (130) to detect the voltage of the secondary coil (120), the first feedback module (400) being connected with the control module (300).
2. The primary side feedback RCC circuit of claim 1, wherein: further comprising a second feedback module (500), the second feedback module (500) being connected with the auxiliary coil (130) for detecting the voltage of the primary coil (110), the second feedback module (500) being connected with the control module (300).
3. The primary side feedback RCC circuit of claim 2, wherein: the control module (300) comprises a second switch tube (310), one end of the second switch tube (310) is connected with the control end of the first switch tube (200), the other end of the second switch tube (310) is grounded, and the first feedback module (400) and the second feedback module (500) are both connected with the control end of the second switch tube (310).
4. A primary side feedback RCC circuit according to claim 3, wherein: the first feedback module (400) comprises a diode D4, a capacitor C5 and a resistor R8, the dotted terminal of the primary coil (110) is connected with the power supply terminal, the cathode of the diode D4 is connected with the dotted terminal of the auxiliary coil (130), the anode of the diode D4 is respectively connected with one end of the capacitor C5 and one end of the resistor R8, the other end of the resistor R8 is connected with the control terminal of the second switch tube (310), and the other end of the capacitor C5 is connected with the dotted terminal of the auxiliary coil (130).
5. The primary side feedback RCC circuit of claim 4, wherein: the second feedback module (500) comprises a resistor R5, one end of the resistor R5 is connected with the same name end of the auxiliary coil (130), and the other end of the resistor R5 is connected with the control end of the second switch tube (310).
6. The primary side feedback RCC circuit of claim 4, wherein: the high-voltage switch circuit further comprises a capacitor C4, a resistor R4 and a voltage regulator tube D5, one end of the capacitor C4 is connected with the end with the same name of the auxiliary coil (130), the other end of the capacitor C4 is connected with one end of the resistor R4, the other end of the resistor R4 is connected with the cathode of the voltage regulator tube D5 and the control end of the first switch tube (200) respectively, and the anode of the voltage regulator tube D5 is connected with the anode of the diode D4 and one end of the capacitor C5 respectively.
7. The primary side feedback RCC circuit of claim 5, wherein: the overcurrent protection circuit is characterized by further comprising an overcurrent protection module (600), wherein the overcurrent protection module (600) is respectively connected with the control ends of the first switch tube (200) and the second switch tube (310), and the overcurrent protection module (600) can reduce the on-off frequency of the first switch tube (200) when the current of the first switch tube (200) exceeds a threshold value.
8. The primary side feedback RCC circuit of claim 7, wherein: the overcurrent protection module (600) comprises a resistor R7 and a resistor R9, one end of the resistor R7 is connected with the first switch tube (200) and one end of the resistor R9 respectively, the other end of the resistor R7 is connected with the control end of the second switch tube (310), and the other end of the resistor R9 is grounded.
9. The primary side feedback RCC circuit of claim 8, wherein: the circuit further comprises a resistor R6, one end of the resistor R6 is connected with the other end of the resistor R7 and the other end of the resistor R8, and the other end of the resistor R6 is connected with the other end of the resistor R5 and the control end of the second switch tube (310).
10. The primary side feedback RCC circuit of claim 1, wherein: the transformer further comprises a rectifying and filtering module (700), wherein the rectifying and filtering module (700) is connected with the same-name end of the primary coil (110).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121404753.0U CN215817929U (en) | 2021-06-23 | 2021-06-23 | Primary side feedback RCC circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121404753.0U CN215817929U (en) | 2021-06-23 | 2021-06-23 | Primary side feedback RCC circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215817929U true CN215817929U (en) | 2022-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121404753.0U Expired - Fee Related CN215817929U (en) | 2021-06-23 | 2021-06-23 | Primary side feedback RCC circuit |
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| CN (1) | CN215817929U (en) |
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2021
- 2021-06-23 CN CN202121404753.0U patent/CN215817929U/en not_active Expired - Fee Related
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Granted publication date: 20220211 |