CN211701821U - Switch power supply input sampling module for isolated secondary side control - Google Patents
Switch power supply input sampling module for isolated secondary side control Download PDFInfo
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- CN211701821U CN211701821U CN202020204769.6U CN202020204769U CN211701821U CN 211701821 U CN211701821 U CN 211701821U CN 202020204769 U CN202020204769 U CN 202020204769U CN 211701821 U CN211701821 U CN 211701821U
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- 238000002955 isolation Methods 0.000 claims description 5
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Abstract
The utility model discloses a switching power supply input sampling module for isolated secondary side control, which comprises an input voltage modulation unit, a high-frequency signal transmission unit and an input voltage demodulation unit; the input voltage modulation unit generates a high-frequency carrier signal, and modulates the high-frequency carrier signal by using input voltage to obtain a high-frequency signal comprising the input voltage signal; the high-frequency signal transmission unit transmits the high-frequency signal from the primary side to the secondary side of the switching power supply, demodulates the high-frequency signal through the input voltage demodulation unit to obtain a recovered input voltage signal, and transmits the recovered input voltage signal to the secondary side system control unit, so that the state of the input voltage is monitored and reported. The photoelectric coupler is not used in the whole process, and the defects of the photoelectric coupler are avoided. Therefore, the adjusting speed is high, the service life is long, and the parameters are basically not influenced by the ambient temperature.
Description
Technical Field
The utility model relates to a power electronics or power electronics field, more specifically say, relate to a switching power supply input sampling module for control of isolated form secondary limit.
Background
In the prior art, an opto-coupler is usually used to realize signal transmission between the primary and secondary sides of the transformer (i.e., between the primary and secondary sides). Although the method is mature and simple, the disadvantages of the method using the photocoupler isolation are significant, and include slow reaction speed, short lifetime, severe parameter variation (such as light attenuation caused by ambient temperature variation), and the like. The control circuit adopts a non-optical coupling design, the main control chip is arranged on the secondary side, and an analog circuit part (error amplifier) which is easy to be interfered in a closed loop is reduced to the maximum extent, so that output voltage ripples have good low-frequency characteristics, and the Layout requirement of Layout is reduced. At this moment, the monitoring and communication unit of the switching power supply and the upper computer is also preferably arranged on the secondary side, and the primary side input voltage information needs to be transmitted to the secondary side. Generally, the methods we adopt are: 1. the isolation operational amplifier is adopted, and the method has complex circuit and high cost; 2. the method is characterized in that a winding is extracted from a transformer of an auxiliary source, and a forward circuit is used for sampling, so that the method is not applicable when the input is high voltage and the duty ratio of the auxiliary source is small.
Disclosure of Invention
An object of the utility model is to provide a switching power supply input sampling module for control of isolated form secondary limit. To solve the problems set forth in the background art described above.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a switching power supply input sampling module for isolated secondary side control is constructed, and comprises an input voltage modulation unit, a high-frequency signal transmission unit and an input voltage demodulation unit; the input voltage modulation unit generates a high-frequency carrier signal, and modulates the high-frequency carrier signal by using input voltage to obtain a high-frequency signal comprising the input voltage signal; the high-frequency signal transmission unit transmits the high-frequency signal from the primary side to the secondary side of the switching power supply, demodulates the high-frequency signal through the input voltage demodulation unit to obtain a recovered input voltage signal, and transmits the recovered input voltage signal to the secondary side system control unit, so that the state of the input voltage is monitored and reported.
Furthermore, the input voltage modulation unit further comprises a waveform conversion module for converting the input high-frequency carrier wave from a square wave to a triangular wave and an operation module for comparing the output of the waveform conversion module with the input voltage signal, wherein the operation module outputs a high-frequency signal, and the high-frequency signal is a high-frequency square wave with a certain frequency and a duty ratio determined by the input voltage signal.
Furthermore, the waveform conversion module comprises a first resistor, a first capacitor and a first diode, one end of the first capacitor is grounded, the other end of the first capacitor is connected with the anode of the first diode, the first resistor is connected in parallel with the two ends of the first diode, a high-frequency carrier wave is input from the cathode of the first diode, a triangular wave is output from the anode of the first diode and is connected to one input end of the operation module, the other input end of the operation module inputs the input voltage signal, and the output end of the operation module is connected with the high-frequency signal transmission unit.
Further, the high frequency signal transmission unit includes a digital isolator or a high frequency isolation transformer.
Furthermore, the high-frequency signal transmission unit comprises two connection ports, one connection port is connected with a circuit on the primary side of the switching power supply, and the other connection port is connected with a circuit on the secondary side of the switching power supply; the primary side circuit of the switching power supply comprises an input voltage modulation unit, and the secondary side circuit of the switching power supply comprises the input voltage demodulation unit.
Further, the input voltage demodulation unit receives the high frequency signal from one end of the high frequency signal transmission unit, performs signal conversion on the high frequency signal to obtain a restored input voltage signal having an analog voltage value, and transmits the signal to the secondary side system control unit.
Furthermore, the input voltage demodulation unit includes a second capacitor and a second resistor, one end of the second capacitor is grounded, the other end of the second capacitor is connected to one end of the second resistor, the other end of the second resistor is connected to the secondary side system control unit, the high-frequency signal is input from a connection point of the second capacitor and the second resistor, and the restored input voltage signal is output from the other end of the second resistor.
Implement the utility model discloses a switching power supply input sampling module for vice limit of isolated form control has following beneficial effect: the input voltage is compared with the set triangular wave to form a high-frequency square wave of which the duty ratio is determined by the input voltage signal, the high-frequency square wave is coupled to the secondary side of the power transformer through magnetic induction or the high-frequency transformer and then processed, and the input voltage signal component contained in the high-frequency square wave is taken out, so that the input voltage can be detected and reported on the secondary side. The photoelectric coupler is not used in the whole process, and the defects of the photoelectric coupler are avoided. Therefore, the adjusting speed is high, the service life is long, and the parameters are basically not influenced by the ambient temperature. Meanwhile, the circuit is simple, the cost is low, and the circuit is not influenced by the input voltage.
Drawings
Fig. 1 is a block diagram illustrating the structure of the present invention.
Fig. 2 is a schematic block diagram of an implementation circuit of the present invention.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
Fig. 2 shows a more specific circuit schematic block diagram of a switching power supply input sampling module for isolated secondary side control, and in fig. 2, the input voltage signal is obtained by dividing the input voltage of the switching power supply by a set resistor. In fig. 2, the voltage division of the input voltage is realized by two resistors R2 and R3, the input voltage is input from one end of a resistor R2 and enters one end of another resistor R3 through the other end thereof, the other end of the resistor R3 is grounded, the voltage output from the connection end of the two resistors is the voltage division, and the resistance values of the two resistors are set in advance.
The input voltage modulation unit also comprises a waveform conversion module for converting an input high-frequency carrier wave from a square wave into a triangular wave and an operation module for comparing the output of the waveform conversion module with the input voltage signal, wherein the operation module outputs a high-frequency signal which is a high-frequency square wave with a certain frequency and a duty ratio determined by the input voltage signal.
The waveform transformation module comprises a first resistor R1, a first capacitor C1 and a first diode D1, one end of the first capacitor C1 is grounded, the other end of the first capacitor C1 is connected with the anode of the first diode D1, the first resistor R1 is connected in parallel with two ends of the first diode D1, a high-frequency carrier wave (square wave) is input from the cathode of the first diode D1, a triangular wave is output from the anode of the first diode D1 and is connected with one input end of the operation module, the other input end of the operation module inputs the input voltage signal, and the output end of the operation module is connected with the high-frequency signal transmission unit. The operation module is a comparator, and the level of the output level of the operation module is determined by comparing the voltages on the two input ends of the operation module, and the level of the input voltage signal is unchanged in the comparison process, while the level of the triangular wave is changed, so the level of the input voltage signal determines the length of the high level time of the high-frequency square wave signal output by the operation module. Therefore, the high level time of the high frequency square wave actually carries the level of the input voltage signal.
In this embodiment, the high-frequency signal transmission unit includes a digital isolator or a high-frequency isolation transformer. The high-frequency signal transmission unit comprises two connection ports, one connection port is connected with a circuit on the primary side of the switching power supply, and the other connection port is connected with a circuit on the secondary side of the switching power supply; the primary side circuit of the switching power supply comprises an input signal modulation unit, and the secondary side circuit of the switching power supply comprises the input voltage demodulation unit. Namely, the high-frequency square wave signal is transmitted to a primary side port of the high-frequency signal transmission unit; and the input voltage signal demodulation unit is connected to the secondary side port of the high-frequency signal transmission unit.
When the input voltage signal demodulation unit receives the high-frequency signal from one end of the high-frequency signal transmission unit, the high-frequency signal demodulation unit performs signal conversion on the high-frequency signal to obtain a recovered input voltage signal with an analog voltage value, and transmits the signal to the secondary side system control unit. The input voltage signal demodulation unit comprises a C2 capacitor and a resistor R4, one end of the capacitor C2 is grounded, the other end of the capacitor C2 is connected with one end of the resistor R4, the other end of the resistor R4 is connected to the secondary side system control unit, the high-frequency signal is input from a connection point of the capacitor C2 and the resistor R4, and the recovered input voltage signal is output from the other end of the resistor R4. That is, the high-frequency square wave signal is subjected to low-frequency filtering to obtain the direct current part representing the input voltage signal, and the direct current part is transmitted to the secondary side system control unit to monitor and report the input voltage.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (7)
1. A switching power supply input sampling module for isolated secondary side control is characterized by comprising an input voltage modulation unit, a high-frequency signal transmission unit and an input voltage demodulation unit; the input voltage modulation unit generates a high-frequency carrier signal, and modulates the high-frequency carrier signal by using input voltage to obtain a high-frequency signal comprising the input voltage signal; the high-frequency signal transmission unit transmits the high-frequency signal from the primary side to the secondary side of the switching power supply, demodulates the high-frequency signal through the input voltage demodulation unit to obtain a recovered input voltage signal, and transmits the recovered input voltage signal to the secondary side system control unit, so that the state of the input voltage is monitored and reported.
2. The input sampling module of claim 1, wherein the input voltage modulation unit comprises a waveform conversion module for converting an input high-frequency carrier from a square wave to a triangular wave, and an operation module for comparing an output of the waveform conversion module with the input voltage signal, wherein the operation module outputs a high-frequency signal, and the high-frequency signal is a high-frequency square wave with a fixed frequency and a duty ratio determined by the input voltage signal.
3. The input sampling module of claim 2, wherein the waveform conversion module comprises a first resistor, a first capacitor and a first diode, one end of the first capacitor is grounded, the other end of the first capacitor is connected to the anode of the first diode, the first resistor is connected in parallel to both ends of the first diode, a high-frequency carrier is input from the cathode of the first diode, a triangular wave is output from the anode of the first diode and connected to one input end of the operation module, the other input end of the operation module inputs the input voltage signal, and the output end of the operation module is connected to the high-frequency signal transmission unit.
4. The input sampling module of the switch power supply for the isolated secondary side control according to claim 1, wherein the high frequency signal transmission unit comprises a digital isolator or a high frequency isolation transformer.
5. The input sampling module of the isolated secondary side controlled switching power supply according to claim 1, wherein the high frequency signal transmission unit includes two connection ports, one of the connection ports is connected to the circuit on the primary side of the switching power supply, and the other of the connection ports is connected to the circuit on the secondary side of the switching power supply; the primary side circuit of the switching power supply comprises an input voltage modulation unit, and the secondary side circuit of the switching power supply comprises the input voltage demodulation unit.
6. The input sampling module of claim 1, wherein the input voltage demodulation unit receives the high frequency signal from one end of the high frequency signal transmission unit, performs signal conversion on the high frequency signal to obtain a recovered input voltage signal with an analog voltage value, and transmits the recovered input voltage signal to the secondary side system control unit.
7. The input sampling module of claim 1, wherein the input voltage demodulation unit comprises a second capacitor and a second resistor, one end of the second capacitor is grounded, the other end of the second capacitor is connected to one end of the second resistor, the other end of the second resistor is connected to the secondary side system control unit, the high-frequency signal is input from a connection point of the second capacitor and the second resistor, and the recovered input voltage signal is output from the other end of the second resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020204769.6U CN211701821U (en) | 2020-02-25 | 2020-02-25 | Switch power supply input sampling module for isolated secondary side control |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020204769.6U CN211701821U (en) | 2020-02-25 | 2020-02-25 | Switch power supply input sampling module for isolated secondary side control |
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| CN211701821U true CN211701821U (en) | 2020-10-16 |
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| CN202020204769.6U Expired - Fee Related CN211701821U (en) | 2020-02-25 | 2020-02-25 | Switch power supply input sampling module for isolated secondary side control |
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| CN (1) | CN211701821U (en) |
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2020
- 2020-02-25 CN CN202020204769.6U patent/CN211701821U/en not_active Expired - Fee Related
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