CN217769906U - Switching power supply circuit, circuit board and air conditioner - Google Patents
Switching power supply circuit, circuit board and air conditioner Download PDFInfo
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- CN217769906U CN217769906U CN202222063955.4U CN202222063955U CN217769906U CN 217769906 U CN217769906 U CN 217769906U CN 202222063955 U CN202222063955 U CN 202222063955U CN 217769906 U CN217769906 U CN 217769906U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- 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
Abstract
The utility model discloses a switching power supply circuit, circuit board and air conditioner, switching power supply circuit includes transformer, DC-DC converter, voltage acquisition circuit, drive control module and MCU module, and the transformer includes primary winding and secondary winding, and primary winding passes through the switch tube ground connection; the DC-DC converter is connected with the secondary winding through a first rectifying and filtering circuit; the voltage acquisition circuit is used for acquiring the voltage of the input end of the DC-DC converter; the driving control module comprises a control circuit, a driving chip and a driving control branch, wherein the driving chip comprises a driving signal output end which is connected to a controlled end of the switching tube through the driving control branch; the MCU module is respectively connected with the voltage acquisition circuit and the control circuit and is used for controlling the on-off of the driving control branch circuit according to the voltage of the input end; in the standby state of the air conditioner, the switching power supply circuit can reduce power consumption to a certain extent and prolong the service life of a switching tube.
Description
Technical Field
The utility model relates to a switching power supply field especially relates to a switching power supply circuit, circuit board and air conditioner.
Background
At present, in an air conditioner controller system, an AC/DC (alternating current/direct current) switching power supply is generally used, and in a switching power supply circuit, a driving chip is generally adopted to drive a switching tube to perform continuous switching, so that electric energy is transmitted through a transformer, but due to impedance of the switching tube, device loss and heat generation are caused in the continuous switching process, and energy loss is caused at the same time.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to solve one of the technical problem that exists among the prior art at least, provide a switching power supply circuit, circuit board and air conditioner, under air conditioner standby state, can reduce the consumption to a certain extent and prolong the switch tube life-span.
In a first aspect, an embodiment of the present invention provides a switching power supply circuit, including: the transformer comprises a primary winding and a secondary winding, and the primary winding is grounded through a switching tube; the DC-DC converter is connected with the secondary winding through a first rectifying and filtering circuit; the voltage acquisition circuit is used for acquiring the voltage of the input end of the DC-DC converter; the driving control module comprises a control circuit, a driving chip and a driving control branch, wherein the driving chip comprises a driving signal output end, and the driving signal output end is connected to the controlled end of the switching tube through the driving control branch; and the MCU (micro controller Unit) module is respectively connected with the voltage acquisition circuit and the control circuit and is used for controlling the on-off of the drive control branch circuit according to the voltage of the input end.
According to the utility model discloses a switching power supply circuit that the embodiment of first aspect provided has following beneficial effect at least: in a switching power supply circuit of an air conditioner controller system, when an air conditioner is in a standby state, the input end voltage of a DC-DC converter is usually maintained at a preset voltage value, but on the premise of ensuring the output voltage of the DC-DC converter to be stable, the input end voltage of the DC-DC converter can fluctuate within a certain range, namely can be smaller than the preset voltage value, an MCU module can monitor the input end voltage of the DC-DC converter and control the state of a switching tube by controlling the on-off of a driving control branch, when the driving control branch is switched on, the switching tube can be normally switched on and off under the action of a driving signal, a transformer carries out energy transfer, the input end voltage of the DC-DC converter rises, when the switching tube is switched off, the transformer stops transferring energy, the input end voltage of the DC-DC converter falls, and therefore the input end voltage of the DC-DC converter can be maintained between a lower limit value and the preset voltage value without influencing the output voltage of the DC-DC converter. In the standby state of the air conditioner, the voltage of the input end of the DC-DC converter does not need to be maintained at a preset voltage value all the time, and the switching tube can be kept turned off in the process of reducing the voltage of the input end of the DC-DC converter, so that the power consumption can be reduced to a certain extent, and the service life of the switching tube can be prolonged.
The utility model discloses an in an embodiment, control circuit includes PNP type triode, NPN type triode, first resistance and second resistance, driver chip is equipped with voltage output pin, the projecting pole of PNP type triode passes through first resistance with voltage output pin connects, the base of PNP type triode with the MCU module is connected, and passes through second resistance ground connection, the collecting electrode of NPN type triode with driving signal output part connects, the projecting pole of NPN type triode with the controlled terminal is connected, the base of NPN type triode with the collecting electrode of PNP type triode is connected.
In an embodiment of the present invention, the voltage acquisition circuit includes a third resistor and a fourth resistor, the input positive terminal of the DC-DC converter is connected to the ground through the series connection of the third resistor and the fourth resistor, and a node between the third resistor and the fourth resistor is connected to the MCU module.
In an embodiment of the present invention, the first rectifying and filtering circuit includes a first rectifying diode and a first energy storage filtering capacitor, an anode of the first rectifying diode is connected to one end of the secondary winding, a cathode of the first rectifying diode is connected to an anode of an input terminal of the DC-DC converter, and the first energy storage filtering capacitor is bridged between two input terminals of the DC-DC converter.
In an embodiment of the present invention, the switching power supply circuit further includes an input unit, the input unit includes an ac voltage source and a rectifier bridge, one end of the primary winding is connected to the positive output terminal of the rectifier bridge, and the other end of the primary winding passes through the switch tube and is grounded.
In an embodiment of the present invention, the other end of the primary winding is further connected to the driver chip, the transformer further includes an auxiliary winding, one end of the auxiliary winding is grounded, and the other end is connected to a VCC (power supply voltage) pin of the driver chip through a second rectifying and filtering circuit.
The utility model discloses an in one embodiment, second rectifier filter circuit includes second rectifier diode and second energy storage filter capacitor, second rectifier diode's positive pole with the other end of auxiliary winding is connected, second rectifier diode's negative pole with driver chip's VCC pin is connected, driver chip's VCC pin passes through second energy storage filter capacitor ground connection.
In an embodiment of the present invention, an output end of the DC-DC converter is connected to the MCU module.
In a second aspect, an embodiment of the present invention provides a circuit board, including the utility model provides a switching power supply circuit.
According to the utility model discloses the circuit board that the embodiment of second aspect provided has following beneficial effect at least: in a switching power supply circuit of an air conditioner controller system, when an air conditioner is in a standby state, the voltage of an input end of a DC-DC converter is usually maintained at a preset voltage value, but on the premise of ensuring the output voltage of the DC-DC converter to be stable, the voltage of the input end of the DC-DC converter can fluctuate within a certain range, namely can be smaller than the preset voltage value, and an MCU module can monitor the voltage of the input end of the DC-DC converter and control the state of a switching tube by controlling the on-off of a driving control branch, so that the voltage of the input end of the DC-DC converter can be maintained between a lower limit value and the preset voltage value, and the output voltage of the DC-DC converter cannot be influenced. In the standby state of the air conditioner, the voltage of the input end of the DC-DC converter does not need to be maintained at a preset voltage value all the time, and the switching tube can be kept off in the process of reducing the voltage of the input end of the DC-DC converter, so that the power consumption can be reduced to a certain extent, and the service life of the switching tube can be prolonged.
The embodiment of the utility model provides an air conditioner, include the utility model discloses the switching power supply circuit that the embodiment of the first aspect provided.
According to the utility model discloses third aspect embodiment provides an air conditioner, has following beneficial effect at least: in a switching power supply circuit of an air conditioner controller system, when an air conditioner is in a standby state, the voltage of an input end of a DC-DC converter is usually maintained at a preset voltage value, but on the premise of ensuring the output voltage of the DC-DC converter to be stable, the voltage of the input end of the DC-DC converter can also fluctuate within a certain range, namely being smaller than the preset voltage value, and an MCU module can monitor the voltage of the input end of the DC-DC converter and control the state of a switching tube by controlling the on-off of a driving control branch circuit, so that the voltage of the input end of the DC-DC converter can be maintained between a lower limit value and the preset voltage value, and the output voltage of the DC-DC converter cannot be influenced. In the standby state of the air conditioner, the voltage of the input end of the DC-DC converter does not need to be maintained at a preset voltage value all the time, and the switching tube can be kept off in the process of reducing the voltage of the input end of the DC-DC converter, so that the power consumption can be reduced to a certain extent, and the service life of the switching tube can be prolonged.
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 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.
The present invention will be further described with reference to the accompanying drawings and examples;
fig. 1 is a schematic diagram of a switching power supply circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of another switching power supply circuit according to another embodiment of the present invention.
Detailed Description
This section will describe in detail the embodiments of the present invention, the preferred embodiments of which are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can visually and vividly understand each technical feature and the whole technical solution of the present invention, but it cannot be understood as a limitation to the scope of the present invention.
In the description of the present invention, if there are first and second descriptions for distinguishing technical features, they are not interpreted 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.
At present, in an air conditioner controller system, an AC/DC (alternating current/direct current) switching power supply is generally used, in a switching power supply circuit, a driving chip is generally adopted to drive a switching tube to perform continuous switching, so as to transmit electric energy through a transformer, but because the switching tube has impedance, device loss and heat generation can be caused in the continuous switching process, and energy loss is caused at the same time.
Based on this, the embodiment of the utility model provides a switching power supply circuit, circuit board and air conditioner is in under the condition of standby state at the air conditioner, can reduce the consumption to a certain extent and prolong the switch tube life-span.
The embodiments of the present invention will be further explained with reference to the drawings.
Referring to fig. 1, an embodiment of the present invention provides a switching power supply circuit, which includes a transformer, a DC-DC converter, a voltage acquisition circuit, a driving control module, and an MCU module, wherein the transformer includes a primary winding and a secondary winding, the primary winding is grounded through a switching tube, one end of the primary winding is connected to a power supply, the other end of the primary winding is connected to one end of the switching tube, the other end of the switching tube is grounded, and the switching tube can control whether voltage is generated at two ends of the primary winding; the DC-DC converter can perform voltage conversion, the input end of the DC-DC converter is connected with the secondary winding through the first rectifying and filtering circuit, when the switching tube is normally switched on and off under the action of a driving signal, voltage is generated at two ends of the primary winding, the transformer performs energy transfer, the voltage at the input end of the DC-DC converter rises, when the switching tube is kept turned off and no voltage is generated at two ends of the primary winding, the transformer stops transferring energy, and the voltage at the input end of the DC-DC converter falls; the voltage acquisition circuit is connected with the positive electrode of the input end of the DC-DC converter and is used for acquiring the voltage of the input end of the DC-DC converter; the driving control module comprises a control circuit, a driving chip and a driving control branch, wherein the driving chip comprises a driving signal output end which is connected to the controlled end of the switching tube through the driving control branch; the MCU module is respectively connected with the voltage acquisition circuit and the control circuit and is used for controlling the on-off of the drive control branch circuit according to the voltage of the input end. Under the condition that the drive control branch is conducted, the switching tube can receive a drive signal and normally switch under the action of the drive signal so as to enable the transformer to transfer energy, and the voltage of the input end of the DC-DC converter is usually maintained at a preset voltage value in the standby state of the air conditioner; when the driving control branch is disconnected, the switching tube cannot receive a driving signal, the switching tube is kept disconnected, the transformer cannot transmit electric energy, the voltage of the input end of the DC-DC converter is reduced, in a standby state of the air conditioner, the output voltage of the DC-DC converter is smaller, the voltage of the input end of the DC-DC converter can fluctuate within a certain range, namely can be smaller than a preset voltage value, and cannot influence the output voltage of the DC-DC converter as long as the voltage is larger than the lower limit of the voltage value. In the standby state of the air conditioner, the voltage of the input end of the DC-DC converter does not need to be maintained at a preset voltage value all the time, and the switching tube can be kept turned off in the process of the voltage reduction of the input end of the DC-DC converter, so that the power consumption of a circuit can be reduced to a certain extent, the loss of devices is reduced, and the service life of the switching tube is prolonged.
It can be understood by those skilled in the art that, in the embodiment of the present invention, the type of the switch tube is not specifically limited, and the switch tube may be a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) or an Insulated Gate Bipolar Transistor (IGBT), as long as the switch tube can be normally switched under the action of the driving signal, which is within the protection scope of the embodiment of the present invention.
It will also be understood by those skilled in the art that the driving signal may be referred to as a Pulse Width Modulation (PWM) signal.
In some embodiments, the MCU module may preset a first preset value and a second preset value, where the first preset value may be a preset voltage value, and the second preset value may be a voltage value slightly greater than a lower limit of the voltage value, and in a standby state of the air conditioner, the MCU module may control the driving control branch to be turned off when detecting that the voltage at the input end of the DC-DC converter is equal to the first preset value; and under the condition that the MCU module detects that the voltage of the input end of the DC-DC converter is less than a second preset value, the drive control branch circuit can be controlled to be conducted.
Referring to fig. 2, an embodiment of the present invention provides a switching power supply circuit, wherein the control circuit includes a PNP type triode, an NPN type triode, a first resistor and a second resistor, the driving chip is provided with a voltage output pin, an emitter of the PNP type triode is connected with the voltage output pin of the driving chip through the first resistor, namely, the emitter of the PNP type triode is connected with one end of the first resistor, the other end of the first resistor is connected with the voltage output pin of the driving chip, a base of the PNP type triode is connected with the MCU module, and the base of the PNP type triode is grounded through the second resistor, namely, the base of the PNP type triode is connected with one end of the second resistor, and the other end of the second resistor is grounded; the collector of the NPN type triode is connected with the driving signal output end of the driving chip, the emitter of the NPN type triode is connected with the controlled end of the switching tube, and the base of the NPN type triode is connected with the collector of the PNP type triode. The MCU module can control the conduction and the cut-off of the PNP type triode by controlling the base voltage of the PNP type triode, thereby controlling the conduction and the cut-off of the NPN type triode to control the on-off of the driving control branch. In a standby state of the air conditioner, when the MCU module detects that the voltage of the input end of the DC-DC converter reaches a preset voltage value, a high level can be output to the base electrode of the PNP type triode, the PNP type triode is cut off at the moment, the collector electrode of the PNP type triode is at a low level, the NPN type triode is cut off, the drive control branch circuit is disconnected, the switch tube is kept closed, the transformer stops energy transfer, the voltage of the input end of the DC-DC converter is reduced, under the condition that the MCU module detects that the voltage of the input end of the DC-DC converter is close to the lower limit of the voltage value, the MCU module can output a low level to the base electrode of the PNP type triode, the PNP type triode is conducted at the moment, the collector electrode of the PNP type triode is at a high level, the NPN type triode is conducted, the drive control branch circuit is conducted, the switch tube is normally switched under the action of a drive signal, the transformer conducts energy transfer, and the voltage of the input end of the DC-DC converter is increased. In the standby state of the air conditioner, the voltage of the input end of the DC-DC converter is maintained between the lower limit of the voltage value and the preset voltage value, the output voltage of the DC-DC converter is kept unchanged, and the switching tube is kept turned off in the process of the voltage reduction of the input end of the DC-DC converter, so that the power consumption of a circuit can be reduced to a certain extent, the loss of devices is reduced, and the service life of the switching tube is prolonged.
As will be understood by those skilled in the art, before the switching power supply circuit is started, the transformer does not perform energy transfer, and the MCU module cannot obtain power supply, so that a PNP type triode is adopted, and an emitter of the PNP type triode is connected to a voltage output pin of the driving chip and is maintained at a high level, where the voltage output pin may be a reference voltage pin, when a base of the PNP type triode is at a low level, the PNP type triode may be turned on, and in a case that the MCU does not output a high level signal to the base of the PNP type triode, the base of the PNP type triode is grounded through a second resistor, i.e., at a low level, the PNP type triode is turned on, so that the base of the NPN type triode is at a high level, and a controlled terminal of the switching tube is at a low level before the switching power supply circuit is started, so that the switching power supply circuit can be started, and after the switching power supply circuit is powered on, the MCU obtains a power supply voltage, and may output a high level, so that the base of the NPN type triode is at a high level, and the PNP type triode is turned off, so that the switching power supply circuit is turned off, thereby disconnecting the driving control circuit.
Referring to fig. 1 or fig. 2, in an exemplary embodiment, the voltage acquisition circuit includes a third resistor and a fourth resistor, an input end anode of the DC-DC converter is grounded through the third resistor and the fourth resistor connected in series, that is, the input end anode of the DC-DC converter is connected to one end of the third resistor, another end of the third resistor is connected to the fourth resistor, another end of the fourth resistor is grounded, the third resistor and the fourth resistor are divider resistors, a node between the third resistor and the fourth resistor is connected to the MCU module, that is, the MCU module is connected to another end of the third resistor, the MCU can obtain a voltage V1 across the fourth resistor, and can calculate an input end voltage VIN of the DC-DC converter according to the voltage V1 across the fourth resistor, a resistance value R3 of the third resistor, and a resistance value R4 of the fourth resistor, and the calculation formula is: VIN = V1 (R3 + R4)/R4.
It can be understood by those skilled in the art that the resistance values of the third resistor and the fourth resistor are not specifically limited in this embodiment, as long as voltage division can be implemented so that the MCU calculates the input voltage of the DC-DC converter; and the embodiment of the utility model provides a do not specifically prescribe a limit to the structure of voltage acquisition circuit, also can adopt the input end voltage of other circuit collection DC-DC converters, as long as can make the MCU module acquire the input voltage of DC-DC converter can, all be in the utility model discloses the protection within range of embodiment.
Referring to fig. 1 or fig. 2, the first rectifying and filtering circuit includes a first rectifying diode and a first energy storage and filtering capacitor, an anode of the first rectifying diode is connected to one end of the secondary winding, a cathode of the first rectifying diode is connected to an anode of the input terminal of the DC-DC converter, and the first energy storage and filtering capacitor is bridged between two input terminals of the DC-DC converter. Under the normal switching state of the switching tube, the secondary winding generates alternating-current voltage, the alternating-current voltage is converted into direct-current voltage through the first rectifier diode, the first energy storage filter capacitor can filter the voltage of the input end of the DC-DC converter, in addition, under the state that the switching tube is kept to be turned off, the first energy storage filter capacitor discharges, the stored electric energy is released, the continuously reduced voltage is provided for the input end of the DC-DC converter, when the voltage of the input end of the DC-DC converter is reduced to be close to the lower limit of the voltage value, the switching tube enters the normal switching state under the control of the MCU module, the voltage of the input end of the DC-DC converter rises, and the first energy storage filter capacitor charges and stores energy.
The utility model discloses an in some embodiments, first rectification filter circuit also can be full wave rectifier circuit, can also be equipped with a plurality of electric capacities that are used for energy storage filtering, the embodiment of the utility model provides a do not specifically inject first rectification filter circuit's structure, as long as can be used for rectification filtering can, all be in the utility model discloses in the protection scope.
Referring to fig. 1 or fig. 2, in the embodiment of the present invention, the switching power supply circuit further includes an input unit, the input unit includes an ac voltage source and a rectifier bridge, one end of the primary winding is connected to the positive electrode of the output end of the rectifier bridge, the other end of the primary winding is grounded through the switch tube, that is, the other end of the primary winding is connected to one end of the switch tube, and the other end of the switch tube is grounded. The negative electrode of the output end of the rectifier bridge is grounded, and the output end of the rectifier bridge is connected with a filter capacitor in a crossing mode.
Referring to fig. 2, in the embodiment of the utility model, the switch power supply circuit includes starting circuit, the other end of primary winding still is connected with driver chip, be used for starting switch power supply circuit, on switch power supply circuit, input unit charges for driver chip's inside start-up electric capacity through primary winding, charge to starting voltage when starting electric capacity, driver chip begins to work, provide drive signal for the switch tube, the normal switch of switch tube, the transformer carries out energy transfer, the transformer still includes auxiliary winding, auxiliary winding's one end ground connection, the other end is connected with driver chip's VCC pin through second rectification filter circuit, under the normal switch's of switch tube state, auxiliary winding produces induced voltage, induced voltage changes direct current voltage into through second rectification filter circuit, the VCC pin power supply of being driver chip by auxiliary winding this moment.
In another possible embodiment, the starting circuit of the switching power supply may also have other structures, for example, the starting capacitor of the driving chip may be connected to the positive electrode of the output end of the rectifier bridge through a resistor, and the starting capacitor may also be charged after power-on to start the switching power supply circuit, which is also within the protection scope of this embodiment.
As shown in fig. 2, the second rectifying and filtering circuit includes a second rectifying diode and a second energy-storage filtering capacitor, an anode of the second rectifying diode is connected to the other end of the auxiliary winding, a cathode of the second rectifying diode is connected to a VCC pin of the driving chip, the VCC pin of the driving chip is grounded through the second energy-storage filtering capacitor, and the second rectifying and filtering circuit can rectify and filter the induced voltage generated by the auxiliary winding, so as to convert the alternating current into a direct current to supply to the driving chip.
It can be understood by those skilled in the art that the second rectifying and filtering circuit may have other structures, for example, a full-wave rectifying circuit may be sampled, and a plurality of capacitors for energy storage and filtering may also be provided.
Referring to fig. 1 or 2, the output end of the DC-DC converter is connected to the MCU module, and can supply power to the MCU module, so that the MCU module can perform communication and control processing functions. It can be understood that, in the standby state of the air conditioner, most of the loads in the air conditioner do not work, the air conditioner only needs the MCU module to keep communication so as to receive the startup signal, and after the air conditioner is started, the DC-DC converter can also supply power to other loads, such as a temperature sensor, a humidity sensor, and the like.
The embodiment of the utility model provides a still provide a circuit board, this circuit board includes the embodiment of the utility model provides a switching power supply circuit. When the air conditioner is in a standby state, the input end voltage of a DC-DC converter in a switching power supply circuit is usually maintained at a preset voltage value, but on the premise of ensuring the output voltage of the DC-DC converter to be stable, the input end voltage of the DC-DC converter can fluctuate within a certain range, namely can be smaller than the preset voltage value, the MCU module can monitor the input end voltage of the DC-DC converter and control the state of a switching tube by controlling the on-off of a driving control branch, when the driving control branch is switched on, the switching tube can be normally switched on and off under the action of a driving signal, the transformer carries out energy transfer, the input end voltage of the DC-DC converter rises, when the switching tube is switched off, the transformer stops transferring energy, the input end voltage of the DC-DC converter falls, and therefore the input end voltage of the DC-DC converter can be maintained between a lower limit value and the preset voltage value, and the output voltage of the DC-DC converter cannot be affected. In the standby state of the air conditioner, the voltage of the input end of the DC-DC converter does not need to be maintained at a preset voltage value all the time, and the switching tube is kept turned off in the process of reducing the voltage of the input end of the DC-DC converter, so that the power consumption can be reduced to a certain extent, and the service life of the switching tube can be prolonged.
The embodiment of the utility model provides an embodiment still provides an air conditioner, and this air conditioner includes the embodiment of the utility model provides a switching power supply circuit. When the air conditioner is in a standby state, the input end voltage of a DC-DC converter in a switching power supply circuit is usually maintained at a preset voltage value, but on the premise of ensuring the output voltage of the DC-DC converter to be stable, the input end voltage of the DC-DC converter can fluctuate within a certain range, namely can be smaller than the preset voltage value, the MCU module can monitor the input end voltage of the DC-DC converter and control the state of a switching tube by controlling the on-off of a driving control branch, when the driving control branch is switched on, the switching tube can be normally switched on and off under the action of a driving signal, the transformer carries out energy transfer, the input end voltage of the DC-DC converter rises, when the switching tube is switched off, the transformer stops transferring energy, the input end voltage of the DC-DC converter falls, and therefore the input end voltage of the DC-DC converter can be maintained between a lower limit value and the preset voltage value, and the output voltage of the DC-DC converter cannot be affected. In the standby state of the air conditioner, the voltage of the input end of the DC-DC converter does not need to be maintained at a preset voltage value all the time, and the switching tube is kept turned off in the process of reducing the voltage of the input end of the DC-DC converter, so that the power consumption can be reduced to a certain extent, and the service life of the switching tube is prolonged.
The embodiments of the present invention have been described in detail with reference to the 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 of those skilled in the art.
Claims (10)
1. A switching power supply circuit, comprising:
the transformer comprises a primary winding and a secondary winding, and the primary winding is grounded through a switching tube;
the DC-DC converter is connected with the secondary winding through a first rectifying and filtering circuit;
the voltage acquisition circuit is used for acquiring the voltage of the input end of the DC-DC converter;
the driving control module comprises a control circuit, a driving chip and a driving control branch, wherein the driving chip comprises a driving signal output end which is connected to a controlled end of the switching tube through the driving control branch;
and the MCU module is respectively connected with the voltage acquisition circuit and the control circuit and is used for controlling the on-off of the drive control branch according to the voltage of the input end.
2. The switching power supply circuit according to claim 1, wherein: the control circuit comprises a PNP type triode, an NPN type triode, a first resistor and a second resistor, the driving chip is provided with a voltage output pin, an emitting electrode of the PNP type triode is connected with the voltage output pin through the first resistor, a base electrode of the PNP type triode is connected with the MCU module and grounded through the second resistor, a collecting electrode of the NPN type triode is connected with the driving signal output end, an emitting electrode of the NPN type triode is connected with the controlled end, and a base electrode of the NPN type triode is connected with the collecting electrode of the PNP type triode.
3. The switching power supply circuit according to claim 1, wherein the voltage acquisition circuit comprises a third resistor and a fourth resistor, the positive electrode of the input terminal of the DC-DC converter is grounded through the third resistor and the fourth resistor connected in series, and a node between the third resistor and the fourth resistor is connected to the MCU module.
4. The switching power supply circuit according to claim 1, wherein the first rectifying and filtering circuit comprises a first rectifying diode and a first energy storage and filtering capacitor, an anode of the first rectifying diode is connected with one end of the secondary winding, a cathode of the first rectifying diode is connected with an anode of the input end of the DC-DC converter, and the first energy storage and filtering capacitor is connected across two input ends of the DC-DC converter.
5. The switching power supply circuit according to claim 1, further comprising an input unit, wherein the input unit comprises an ac voltage source and a rectifier bridge, one end of the primary winding is connected to an output end anode of the rectifier bridge, and the other end of the primary winding is grounded through the switching tube.
6. The switching power supply circuit according to claim 1, wherein the other end of the primary winding is further connected to the driver chip, the transformer further comprises an auxiliary winding, one end of the auxiliary winding is grounded, and the other end of the auxiliary winding is connected to the VCC pin of the driver chip through a second rectifying and filtering circuit.
7. The switching power supply circuit according to claim 6, wherein the second rectifying and filtering circuit includes a second rectifying diode and a second energy storage and filtering capacitor, an anode of the second rectifying diode is connected to the other end of the auxiliary winding, a cathode of the second rectifying diode is connected to a VCC pin of the driving chip, and the VCC pin of the driving chip is grounded through the second energy storage and filtering capacitor.
8. The switching power supply circuit according to claim 1, wherein an output terminal of the DC-DC converter is connected to the MCU module.
9. A wiring board comprising the switching power supply circuit according to any one of claims 1 to 8.
10. An air conditioner characterized by comprising the switching power supply circuit according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222063955.4U CN217769906U (en) | 2022-08-05 | 2022-08-05 | Switching power supply circuit, circuit board and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222063955.4U CN217769906U (en) | 2022-08-05 | 2022-08-05 | Switching power supply circuit, circuit board and air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217769906U true CN217769906U (en) | 2022-11-08 |
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ID=83879410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222063955.4U Active CN217769906U (en) | 2022-08-05 | 2022-08-05 | Switching power supply circuit, circuit board and air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217769906U (en) |
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2022
- 2022-08-05 CN CN202222063955.4U patent/CN217769906U/en active Active
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