CN218678828U - Synchronous rectification circuit, switching power supply and heat pump controller - Google Patents
Synchronous rectification circuit, switching power supply and heat pump controller Download PDFInfo
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- CN218678828U CN218678828U CN202220852114.9U CN202220852114U CN218678828U CN 218678828 U CN218678828 U CN 218678828U CN 202220852114 U CN202220852114 U CN 202220852114U CN 218678828 U CN218678828 U CN 218678828U
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- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model provides a synchronous rectification circuit, switching power supply and heat pump controller, include: the power supply unit comprises a switching power supply chip for outputting power supply voltage; the transformer unit comprises a transformer, wherein the transformer comprises a primary side of the transformer for receiving the power supply voltage and a secondary side of the transformer for outputting transformation voltage according to the power supply voltage; the synchronous rectification unit comprises a synchronous rectification control chip and an active element which are connected, wherein the synchronous rectification control chip is used for outputting an adjusting signal to the active element according to the transformation voltage, so that the active element performs switching state switching in a period of the transformation voltage according to the adjusting signal to realize rectification; the filtering unit is used for filtering ripple voltage in the output voltage of the synchronous rectification unit; and the suppression unit is used for suppressing the high-frequency interference signal. The embodiment of the utility model provides an in, through synchronous rectification control chip and active element's cooperation in the synchronous rectification unit, can improve synchronous rectification circuit's stability, improve switching power supply efficiency.
Description
Technical Field
The utility model relates to an electronic circuit field, in particular to synchronous rectification circuit, switching power supply and heat pump controller.
Background
With the rapid development of semiconductor devices and very large scale integrated circuits, switching power supplies are used in large quantities due to their high power conversion efficiency, technological innovation with the goals of energy conservation and environmental protection as high as possible has been rapidly raised all over the world, and systems for heating and cooling by using air sources, ground source heat pumps, water source heat pumps and the like have become the energy-saving priority. The traditional heat pump control system adopts a power frequency transformer for power supply, so that the power supply loss is large, therefore, the power supply by adopting a switching power supply becomes a trend of the heat pump system power supply in the future, but when the output rectification of the switching power supply is large, the temperature of the switching power supply can be increased, the stability of the output rectification is influenced, and the working efficiency of equipment is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least, provide a synchronous rectification circuit, switching power supply and heat pump controller, can improve synchronous rectification circuit's stability, improve switching power supply efficiency.
In a first aspect, the present invention provides a synchronous rectification circuit, including: the power supply unit comprises a switching power supply chip for outputting power supply voltage; the transformer unit comprises a transformer, the transformer comprises a primary side of the transformer for receiving the power supply voltage and a secondary side of the transformer for outputting transformation voltage according to the power supply voltage, and the primary side of the transformer is connected with the switching power supply chip; the synchronous rectification unit comprises a synchronous rectification control chip and an active element which are connected, the synchronous rectification unit is connected with the secondary side of the transformer in parallel, and the synchronous rectification control chip is used for outputting an adjusting signal to the active element according to the transformation voltage so that the active element performs switching state switching in a period of the transformation voltage according to the adjusting signal to realize rectification; the filtering unit is connected with the synchronous rectification unit and is used for filtering ripple voltage in the output voltage of the synchronous rectification unit; and the suppression unit is connected with the filtering unit and is used for suppressing the high-frequency interference signals in the voltage transmitted by the filtering unit.
The synchronous rectification circuit at least has the following beneficial effects: firstly, the power supply unit supplies power voltage to the synchronous rectification unit, the filtering unit and the restraining unit, the transformer in the transformation unit transforms the power voltage supplied by the power supply unit and outputs the transformed voltage to the synchronous rectification unit, and secondly, the synchronous control chip in the synchronous rectification unit outputs an adjusting signal to the active element according to the transformed voltage, so that the active element performs switching state switching in the period of the transformed voltage, synchronous rectification of a circuit is realized, the efficiency of the switching power supply is further improved, ripple voltage in the output voltage of the synchronous rectification unit is filtered by the filtering unit, and a high-frequency interference signal in the output voltage of the filtering unit is restrained by the restraining unit, thereby improving the stability of the synchronous rectification circuit.
According to the utility model discloses a some embodiments, synchronous rectification unit is still including being used for absorbing the integral unit of the spike voltage in the synchronous rectification unit output voltage, the integral unit includes fifth resistance and fourth electric capacity, fifth resistance one end with vary voltage unit connects, the other end with fourth electric capacity series connection, the fourth electric capacity with synchronous rectification control chip connects, reduces the danger that spike voltage brought, improves synchronous rectification circuit's security.
According to some embodiments of the invention, the active element is a MOS transistor; when the transformation voltage is in a positive half cycle, the MOS tube is conducted, and when the transformation voltage is in a negative half cycle, the MOS tube is cut off, and the circuit is rectified by conducting and cutting off the MOS tube.
According to the utility model discloses a some embodiments, synchronous rectification circuit still includes sampling feedback unit, sampling feedback unit respectively with the power supply unit the filter unit with restrain the unit connection, sampling feedback unit be used for according to output voltage generates feedback signal, and sends feedback signal extremely power supply unit, the synchronous rectification circuit of being convenient for carries out real-time adjustment to output voltage.
According to the utility model discloses a some embodiments, sampling feedback unit includes sampling unit and feedback unit, sampling unit with restrain the unit connection, sampling unit is used for receiving and is sent by synchronous rectification unit output voltage, feedback unit with switching power supply chip connects, feedback unit is used for sending feedback signal gives switching power supply chip is convenient for improve synchronous rectification circuit's stability.
According to the utility model discloses a some embodiments, the filter unit includes second electric capacity and first electric capacity, the second electric capacity the positive pole first electric capacity respectively with the secondary limit of transformer is parallelly connected, the negative pole of first electric capacity is connected with the reference ground, improves synchronous rectifier circuit's work efficiency.
According to some embodiments of the present invention, the suppression unit comprises a common mode inductor and an output interface, the common mode inductor comprises a first end, a second end, a third end and a fourth end, and the output interface comprises a first output interface and a second output interface; the first end is connected with the secondary side of the transformer, the second end is connected with the negative electrode of the second capacitor in series, the third end is connected with the sampling feedback unit, the second output interface is connected between the third end and the sampling feedback unit in parallel, and the fourth end is connected between the first output interface and a reference ground in parallel, so that the interference of high-frequency signals is inhibited, and the anti-interference capability of the synchronous rectification circuit is enhanced.
According to the utility model discloses a some embodiments, synchronous rectification control chip the second electric capacity with first electric capacity connect in parallel respectively in the secondary limit of transformer with between the first end, be convenient for receive vary voltage to improve synchronous rectification circuit's stability.
In a second aspect, an embodiment of the present invention provides a switching power supply, which includes a synchronous rectification circuit as described in the first aspect.
In a third aspect, an embodiment of the present invention provides a heat pump controller, including a synchronous rectification circuit as described in the first aspect.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the technical solutions of the present invention, and are incorporated in and constitute a part of this specification, together with the embodiments of the present invention for explaining the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.
Fig. 1 is an overall schematic diagram of a synchronous rectification circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a synchronous rectification circuit according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a sampling feedback unit according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of an integrating unit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, if there are first and second descriptions for distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the precedence of the indicated technical features.
In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.
The embodiments of the present invention will be further explained with reference to the drawings.
Referring to fig. 1-2, fig. 1 is an overall schematic diagram of the synchronous rectification circuit provided by an embodiment of the present invention, and fig. 2 is a schematic circuit diagram of the synchronous rectification circuit provided by an embodiment of the present invention, including: a power supply unit 100 including a switching power supply chip IC1 for outputting a power supply voltage; the transformation unit 200 comprises a transformer T1, the transformer T1 comprises a primary side of the transformer for receiving the power supply voltage and a secondary side of the transformer for outputting transformation voltage according to the power supply voltage, and the primary side of the transformer is connected with the switching power supply chip IC1; the synchronous rectification unit 300 comprises a synchronous rectification control chip IC4 and an active element which are connected, the synchronous rectification unit 300 is connected with the secondary side of the transformer in parallel, and the synchronous rectification control chip IC4 is used for outputting an adjusting signal to the active element according to the transformation voltage so that the active element performs switching state switching in a period of the transformation voltage according to the adjusting signal to realize rectification; a filtering unit 400 connected to the synchronous rectification unit 300, for filtering ripple voltage in the output voltage of the synchronous rectification unit 300; the suppressing unit 500 is connected to the filtering unit 400, and is configured to suppress a high-frequency interference signal in the voltage output by the filtering unit 400.
The utility model discloses an embodiment, through power supply unit 100 to synchronous rectifier unit 300, filtering unit 400 and suppression unit 500 provide mains voltage, mains voltage through transformer T1 among transformer unit 200 to power supply unit 100 provides carries out the vary voltage, output vary voltage gives synchronous rectifier unit 300, secondly, through synchronous control chip among the synchronous rectifier unit 300 according to vary voltage output regulation signal to the active element, thereby make the active element carry out the on off state switching in the cycle of vary voltage, realize the synchronous rectification to the circuit, further improve switching power supply's efficiency, and, ripple voltage among the synchronous rectifier unit 300 output voltage of filtering through filtering unit 400, suppress the high frequency interference signal in the voltage that filtering unit 400 carried out through suppression unit 500, thereby improve synchronous rectifier circuit's stability.
It should be noted that, when the switching power supply chip IC1 operates, the energy stored in the primary winding of the transformer supplies power to the load through the secondary winding of the transformer and the synchronous rectification unit 300, so as to transform the power voltage.
It should be noted that the synchronous rectification control chip IC4 is configured to output the adjustment signal to the active element according to the transformation voltage, so that the active element can be turned on or off in a period of the transformation voltage according to the adjustment signal, thereby implementing rectification.
It can be understood that the switching power chip IC1 may be a power chip capable of conditioning an output voltage by using a PWM technique, the types of the switching power chip IC1 include, but are not limited to, SD8666QS, STR456A, STR5412 or STR6020S, and in this embodiment, SD8666QS, the type of the synchronous rectification control chip IC4 in this embodiment includes, but is not limited to, SD8525H, SC1548C or INN3268C, and in this embodiment, SD8525H, and the types of the switching power chip IC1 and the synchronous rectification control chip IC4 are not specifically limited in this embodiment.
Referring to fig. 4, fig. 4 is a schematic circuit diagram of an integrating unit according to an embodiment of the present invention;
the utility model discloses an in the embodiment, synchronous rectification unit 300 is still including the integral unit 310 that is arranged in absorbing the spike voltage in synchronous rectification unit 300 output voltage, integral unit 310 includes fifth resistance R5 and fourth electric capacity C4, fifth resistance R5 one end is connected with vary voltage unit 200, the other end and fourth electric capacity C4 series connection, fourth electric capacity C4 is connected with synchronous rectification control chip IC4, reduce the danger that spike voltage brought, improve synchronous rectification circuit's security.
It can be understood that the fifth resistor R5 is connected in series with the fourth capacitor C4 and is connected in parallel to the second pin and the seventh pin of the synchronous rectification control chip IC4 to form the integration unit 310, which functions as an anti-interference and compensation circuit, reduces the damage caused by the peak voltage, and effectively prevents the equipment from being damaged.
In an embodiment of the present invention, the active device is an MOS transistor; when the transformation voltage is in a positive half cycle, the MOS tube is switched on, and when the transformation voltage is in a negative half cycle, the MOS tube is switched off, and the circuit is rectified by switching on and off the MOS tube.
It can be understood that when the period of the transformation voltage is in the positive half cycle, the MOS transistor is turned on, and when the period of the transformation voltage is in the negative half cycle, the MOS transistor is turned off, thereby realizing the rectification of the circuit.
It should be noted that the MOS transistor and the synchronous rectification control chip IC4 may be in a discrete relationship, or the MOS transistor and the synchronous rectification control chip IC4 may be integrated together, where the active element may also be a device such as a triode that can implement the same switching function, and the embodiment is not particularly limited.
Referring to fig. 3, fig. 3 is a schematic diagram of the sampling feedback unit that an embodiment of the present invention provides an embodiment of the present invention, in an embodiment of the present invention, the synchronous rectification circuit further includes a sampling feedback unit 600, the sampling feedback unit 600 is connected with the power supply unit 100, the filtering unit 400 and the suppressing unit 500 respectively, the sampling feedback unit 600 is used for generating a feedback signal according to the output voltage, and sending the feedback signal to the power supply unit 100, so that the synchronous rectification circuit can adjust the output voltage in real time.
It can be understood that the sampling feedback unit 600 is capable of receiving the output voltage of the synchronous rectification unit 300, generating a feedback signal according to the output voltage of the synchronous rectification unit 300, and sending the feedback signal to the switching power supply chip IC1 of the power supply unit 100, so as to implement real-time adjustment of the output voltage by the switching power supply chip IC 1.
The utility model discloses an in the embodiment, sampling feedback unit 600 includes sampling unit and feedback unit, and the sampling unit is connected with suppression unit 500, and the sampling unit is used for receiving the output voltage who is sent by synchronous rectification unit 300, and the feedback unit is connected with switching power supply chip IC1, and the feedback unit is used for sending feedback signal and gives switching power supply chip IC1, is convenient for improve synchronous rectification circuit's stability.
It should be noted that, the sampling unit includes a voltage-stabilizing reference chip IC3, a third capacitor C3, a first resistor R1, a second resistor R2, and a third resistor R3, one end of the third resistor is connected to the voltage output end, the other end is connected to the control electrode of the voltage-stabilizing reference chip, the first resistor R1 and the third capacitor C3 are connected in series, the first resistor R1 and the third capacitor C3 are connected in parallel between the cathode and the control electrode of the voltage-stabilizing reference chip, and the second resistor R2 is connected in parallel between the anode and the control electrode of the voltage-stabilizing reference chip, where the third resistor samples the output voltage sent by the synchronous rectification unit 300, and the second resistor R2 divides the output voltage uniquely, thereby implementing real-time adjustment of the output voltage.
It can be understood that the feedback unit comprises an optical coupler IC2 and a fourth resistor R4, the optical coupler IC2 comprises a light emitting diode and a photosensitive resistor, one end of the fourth resistor R4 is connected with the voltage output end, the other end of the fourth resistor R is connected with the anode of the light emitting diode, the cathode of the light emitting diode is connected with the sampling unit, one end of the photosensitive resistor is connected with the switching power supply chip IC1, and the other end of the photosensitive resistor is connected with the reference ground, so that the switching power supply chip IC1 can be conveniently adjusted.
Referring to fig. 2, in an embodiment of the present invention, the filtering unit 400 includes a second capacitor C2 and a first capacitor C1, the positive pole of the second capacitor C2 and the positive pole of the first capacitor C1 are respectively connected in parallel with the secondary side of the transformer, and the negative pole of the first capacitor C1 is connected to the reference ground, so as to improve the working efficiency of the synchronous rectification circuit.
It is understood that the filtering unit 400 is located between the synchronous rectification unit 300 and the suppression unit 500, so as to filter the ripple voltage in the output voltage of the synchronous rectification unit 300.
Referring to fig. 2, in an embodiment of the present invention, the suppressing unit 500 includes a common mode inductor L1 and an output interface CN1, the common mode inductor L1 includes a first end, a second end, a third end and a fourth end, and the output interface CN1 includes a first output interface and a second output interface; the first end is connected with the secondary side of the transformer, the second end is connected with the negative electrode of the second capacitor C2 in series, the third end is connected with the sampling feedback unit 600, the second output interface is connected between the third end and the sampling feedback unit 600 in parallel, and the fourth end is connected between the first output interface and the reference ground in parallel, so that the interference of high-frequency signals is suppressed, and the anti-interference capability of the synchronous rectification circuit is enhanced.
Note that the second terminal is connected in parallel between the negative electrode of the first capacitor C1 and the ground.
The utility model discloses an in the embodiment, synchronous rectification control chip IC4, second electric capacity C2 and first electric capacity C1 connect in parallel respectively between the secondary limit of transformer and first end, are convenient for receive vary voltage to improve synchronous rectification circuit's stability.
Further, based on the above embodiments, the present invention provides a switching power supply, wherein the switching power supply includes the synchronous rectification circuit in any of the above embodiments.
In addition, another embodiment of the present invention further provides a heat pump controller, which includes the synchronous rectification circuit in any of the above embodiments. Therefore, the heat pump controller has the advantages brought by the synchronous rectification circuit in any one of the above embodiments.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge scope of those skilled in the art.
Claims (10)
1. A synchronous rectification circuit, comprising:
the power supply unit comprises a switching power supply chip for outputting power supply voltage;
the transformer unit comprises a transformer, the transformer comprises a primary side of the transformer for receiving the power supply voltage and a secondary side of the transformer for outputting transformation voltage according to the power supply voltage, and the primary side of the transformer is connected with the switching power supply chip;
the synchronous rectification unit comprises a synchronous rectification control chip and an active element which are connected, the synchronous rectification unit is connected with the secondary side of the transformer in parallel, and the synchronous rectification control chip is used for outputting an adjusting signal to the active element according to the transformation voltage so that the active element performs switching state switching in a period of the transformation voltage according to the adjusting signal to realize rectification;
the filtering unit is connected with the synchronous rectification unit and used for filtering ripple voltage in the output voltage of the synchronous rectification unit;
and the suppression unit is connected with the filtering unit and is used for suppressing the high-frequency interference signals in the voltage transmitted by the filtering unit.
2. The synchronous rectification circuit according to claim 1, wherein the synchronous rectification unit further comprises an integration unit for absorbing spike voltage in the output voltage of the synchronous rectification unit, the integration unit comprises a fifth resistor and a fourth capacitor, one end of the fifth resistor is connected with the voltage transformation unit, the other end of the fifth resistor is connected with the fourth capacitor in series, and the fourth capacitor is connected with the synchronous rectification control chip.
3. The synchronous rectification circuit of claim 1, wherein the active element is a MOS transistor; when the transformation voltage is in a positive half cycle, the MOS tube is conducted, and when the transformation voltage is in a negative half cycle, the MOS tube is cut off.
4. The synchronous rectification circuit of claim 1, further comprising a sampling feedback unit, the sampling feedback unit being connected to the power supply unit, the filtering unit and the suppressing unit, respectively, the sampling feedback unit being configured to generate a feedback signal according to the output voltage and send the feedback signal to the power supply unit.
5. The synchronous rectification circuit of claim 4, wherein the sampling feedback unit comprises a sampling unit and a feedback unit, the sampling unit is connected with the suppression unit, the sampling unit is used for receiving the output voltage sent by the synchronous rectification unit, the feedback unit is connected with the switching power supply chip, and the feedback unit is used for sending the feedback signal to the switching power supply chip.
6. The synchronous rectification circuit according to claim 4, wherein the filter unit comprises a second capacitor and a first capacitor, the positive electrode of the second capacitor and the positive electrode of the first capacitor are respectively connected in parallel with the secondary side of the transformer, and the negative electrode of the first capacitor is connected with a reference ground.
7. The synchronous rectification circuit of claim 6, wherein the rejection unit comprises a common mode inductor and an output interface, the common mode inductor comprises a first terminal, a second terminal, a third terminal and a fourth terminal, and the output interface comprises a first output interface and a second output interface;
the first end is connected with the secondary side of the transformer, the second end is connected with the negative electrode of the second capacitor in series, the third end is connected with the sampling feedback unit, the second output interface is connected between the third end and the sampling feedback unit in parallel, and the fourth end is connected between the first output interface and the reference ground in parallel.
8. The synchronous rectification circuit of claim 7, wherein the synchronous rectification control chip, the second capacitor and the first capacitor are respectively connected in parallel between the secondary side of the transformer and the first terminal.
9. A switching power supply, characterized by: a synchronous rectification circuit comprising a synchronous rectification circuit as claimed in any one of claims 1 to 8.
10. A heat pump controller, characterized by: a synchronous rectification circuit comprising a synchronous rectification circuit as claimed in any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220852114.9U CN218678828U (en) | 2022-04-13 | 2022-04-13 | Synchronous rectification circuit, switching power supply and heat pump controller |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220852114.9U CN218678828U (en) | 2022-04-13 | 2022-04-13 | Synchronous rectification circuit, switching power supply and heat pump controller |
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| CN218678828U true CN218678828U (en) | 2023-03-21 |
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| CN202220852114.9U Active CN218678828U (en) | 2022-04-13 | 2022-04-13 | Synchronous rectification circuit, switching power supply and heat pump controller |
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