CN105449991A - Low-power consumption standby device and electrical device - Google Patents
Low-power consumption standby device and electrical device Download PDFInfo
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- CN105449991A CN105449991A CN201510975855.0A CN201510975855A CN105449991A CN 105449991 A CN105449991 A CN 105449991A CN 201510975855 A CN201510975855 A CN 201510975855A CN 105449991 A CN105449991 A CN 105449991A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0032—Control circuits allowing low power mode operation, e.g. in standby mode
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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
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Abstract
The invention discloses a low-power consumption standby device which is used in an electrical device provided with an opening/closing door. The low-power consumption standby device comprises a power supply module and a control module, wherein the power supply module comprises a transformer, a power supply control chip, a feedback module and a wakeup module, the feedback module is arranged at a secondary side of the transformer and connected with an output end of the secondary side and a feedback port of the power supply control chip, the power supply control chip is connected with a primary-side winding of the transformer, the wakeup module is arranged at a primary side of the transformer, connected with a wakeup port of the power supply control chip and used for generating a wakeup signal when the opening/closing door of the electrical device is opened, the control module comprises a master control chip and a shutdown module connected with the master control chip, and the master control chip is used for generating a shutdown control signal and making the shutdown module fed back to the power supply control chip through the feedback module. The invention also discloses the electrical device applying the low-power consumption standby device. With the low-power consumption standby device, the standby power consumption is reduced, and convenient wakeup is also achieved.
Description
Technical Field
The invention relates to the field of standby control of electrical equipment, in particular to a low-power-consumption standby device and the electrical equipment.
Background
The existing electronic product still consumes electric energy in a standby state, generally, the standby power consumption of a scheme using a linear transformer is 2W, and the standby power consumption of a scheme using a switching power supply can be below 1W. Existing electrical devices all have a standby control which will cut off the load supply when the electrical device is not in use. However, in order to avoid the trouble of plugging the power cord, although the electrical equipment is not operated, the power cord of the electrical equipment is always kept in the on state, that is, the standby control device is in the operating state, and corresponding energy consumption is consumed. If the electrical equipment is in standby for a long time, much power is wasted in the process.
Disclosure of Invention
The invention mainly aims to provide a low-power-consumption standby device and electrical equipment, aiming at not only reducing the standby power consumption, but also being convenient to wake up.
In order to achieve the above object, the present invention further provides a low power consumption standby device, which is applied to an electrical apparatus having a switch door, wherein the low power consumption standby device comprises a power module and a control module; wherein,
the power supply module comprises a transformer, a power supply control chip, a feedback module and a wake-up module; the feedback module is positioned on the secondary side of the transformer, is connected with the output end of the secondary side, and is used for acquiring a voltage output signal of the secondary side and feeding back the acquired voltage output signal to a feedback port of the power control chip; the power control chip is connected with the primary side winding of the transformer and used for controlling the conduction and the disconnection of the transformer and adjusting the conduction duty ratio of the transformer according to a feedback signal; the wake-up module is positioned on the primary side of the transformer, is connected with a wake-up port of the power control chip and is used for generating a wake-up signal when a switch door of the electrical equipment is opened;
the control module comprises a main control chip and a shutdown module connected with the main control chip; the main control chip generates a shutdown control signal, and the shutdown module and the feedback module transmit the shutdown control signal to the feedback module so as to feed back the shutdown control signal to the power supply control chip through the feedback module, so that the power supply control chip enters a dormant or protection state.
Preferably, the shutdown module includes a first switch tube, and a base of the first switch tube is connected to an output port of the main control chip;
the feedback module comprises a first optocoupler, a first resistor, a second resistor and a voltage regulator tube; a first output port and a second output port of the first optocoupler are correspondingly connected with a feedback port and a wake-up port of the power control chip; a collector electrode of the first switch tube is connected with a first input port of the first optocoupler through a first resistor, and the collector electrode is also connected with a second input port of the first optocoupler; the emitter of the first switch tube is grounded; the anode of the voltage-stabilizing tube is connected with the emitter of the first switch tube, and the cathode of the voltage-stabilizing tube is connected with the collector of the first switch tube; and a first input port of the first optocoupler is also connected with a voltage output end on the secondary side of the transformer through a second resistor.
Preferably, the shutdown module includes a first switch tube, and a base of the first switch tube is connected to an output port of the main control chip;
the feedback module comprises a first optocoupler, a first resistor, a second resistor and a voltage regulator tube; a first output port and a second output port of the first optocoupler are correspondingly connected with a feedback port and a wake-up port of the power control chip; a collector electrode of the first switch tube is connected with a first input port of the first optocoupler through a first resistor, and the collector electrode is also connected with a second input port of the first optocoupler; the emitter of the first switching tube is grounded through a second resistor; the anode of the voltage-stabilizing tube is connected with the emitter of the first switch tube, and the cathode of the voltage-stabilizing tube is connected with the collector of the first switch tube; and the connection node of the first input port of the first optocoupler and the first resistor is also connected with the voltage output end of the secondary side of the transformer.
Preferably, the wake-up module includes a first capacitor, a second switch tube, a gate switch, a third resistor, a fourth resistor, a fifth resistor, and a first diode; the first end of the auxiliary winding of the transformer is connected with the awakening port of the power control chip through a fifth resistor and a first diode; one end of the first capacitor is connected with the awakening port of the power control chip, and the other end of the first capacitor is grounded; an emitting electrode of the second switching tube is connected with the awakening port of the power control chip, and the other end of the second switching tube is grounded; the base electrode of the second switch tube is connected with the gate switch and then grounded through a parallel circuit of a second capacitor and a third resistor; and the base electrode of the second switching tube is also connected with the awakening port of the power supply control chip through a fourth resistor.
Preferably, the wake-up module includes: the switch comprises a first capacitor, a second capacitor, a third switch tube, a fourth switch tube, a gate switch, a third resistor, a fourth resistor, a fifth resistor, an eighth resistor, a ninth resistor, a tenth resistor and a first diode; one end of the first capacitor is connected with the awakening port of the power control chip, and the other end of the first capacitor is grounded; an emitter of the third switch tube is connected with the awakening port of the power control chip, a collector of the third switch tube is connected with an emitter of the fourth switch tube, and a collector of the fourth switch tube is grounded; one end of the eighth resistor is connected with the emitting electrode of the third switching tube, and the other end of the eighth resistor is connected with the collector electrode of the third switching tube;
the first end of the auxiliary winding of the transformer is connected with the awakening port of the power control chip through a fifth resistor and a first diode; one path of a base electrode of the third switching tube is connected with the awakening port of the power control chip through a fourth resistor, and the other path of the base electrode of the third switching tube is connected with the gate switch and then grounded through a parallel circuit of a second capacitor and a third resistor; the first end of the auxiliary winding of the transformer is grounded after sequentially passing through a ninth resistor and a tenth resistor, and a connecting node of the ninth resistor and the tenth resistor is connected with the base electrode of the fourth switching tube.
Preferably, the wake-up circuit further comprises a sixth resistor and a seventh resistor; the first end of the auxiliary winding of the transformer is grounded through a seventh resistor and a sixth resistor in sequence, and a connecting node of the seventh resistor and the sixth resistor is connected with a feedback port of the power supply control chip.
Preferably, the wake-up circuit further includes a third capacitor, one end of the third capacitor is connected to the feedback port of the power control chip, and the other end of the third capacitor is connected to the wake-up port of the power control chip.
Preferably, the low power consumption standby device further includes:
and one end of the zero-crossing control module is connected with the awakening module, and the other end of the zero-crossing control module is connected with the zero-crossing signal generation module of the control module and used for controlling the zero-crossing signal generation module to be turned on or turned off according to the working state of the power control chip.
Preferably, the zero-crossing control module comprises a first electrolytic capacitor, a second optical coupler and an eleventh resistor; the positive end of the first electrolytic capacitor is connected with the first end of the auxiliary winding of the transformer, and the negative end of the first electrolytic capacitor is grounded; the positive end of the first electrolytic capacitor passes through an eleventh resistor and then sequentially passes through a first primary port and a second primary port of the second optocoupler and then is grounded; and a first secondary port of the second optocoupler is connected with a zero line L, and a second secondary port of the second optocoupler is connected with the zero-crossing signal generating module.
In addition, in order to achieve the above object, the present invention also provides an electric appliance, comprising a switch door; the electrical equipment further comprises an electric control board and a door monitoring interlock, wherein the electric control board is provided with the low-power-consumption standby device with the structure, a door switch of the low-power-consumption standby device is the door monitoring interlock, and the door monitoring interlock is disconnected when a door is opened and closed; when the switch door of the electrical equipment is in a door opening state, the door is monitored and interlocked to be closed.
According to the embodiment of the invention, the power-off control signal is generated by the main control chip when the electrical equipment is in the standby state, and is transmitted to the power control chip through the power-off module so as to control the power control chip to enter the protection or dormancy state, so that the standby power consumption is reduced. Experiments prove that the standby power consumption can be below 5mW by the mode. In addition, the embodiment of the invention also arranges the awakening module in the power module, and the awakening of the power control chip can be realized along with the operation of the electrical equipment. Therefore, the embodiment of the invention not only reduces the standby power consumption, but also is convenient to wake up.
Drawings
FIG. 1 is a functional block diagram of a low power consumption standby device according to a first embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an embodiment of a shutdown module and a feedback module of the low power consumption standby device shown in fig. 1;
fig. 3 is a schematic circuit diagram of another embodiment of a shutdown module and a feedback module of the low power consumption standby device shown in fig. 1;
fig. 4 is a schematic circuit diagram of an embodiment of a wake-up module of the low power consumption standby device shown in fig. 1;
FIG. 5 is a schematic circuit diagram of another embodiment of a wake-up module of the low power consumption standby device shown in FIG. 1;
FIG. 6 is a functional block diagram of a low power consumption standby device according to a second embodiment of the present invention;
FIG. 7 is a functional block diagram of a low power consumption standby device according to a third embodiment of the present invention;
FIG. 8 is a schematic circuit diagram of the low power consumption standby device shown in FIG. 7;
FIG. 9 is a schematic diagram of the electrical connection of a microwave oven to which the low power consumption standby device of the present invention is applied;
fig. 10 is a schematic view showing the operation of the microwave oven according to the present invention.
The reference numbers illustrate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that the description relating to "first", "second", etc. in the present invention is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should be considered to be absent and not within the protection scope of the present invention.
The invention provides a low-power-consumption standby device which not only can realize low-power-consumption standby, but also is convenient to wake up. The low-power consumption standby device is applied to electric equipment such as a microwave oven, an oven and the like with an opening and closing door and standby control.
As shown in fig. 1, the low power consumption standby apparatus 100 may include a power module 110 and a control module 120. The power module 110 is configured to receive the commercial power and convert the commercial power into a driving power for driving the control module 120. The control module 120 controls the operating states of the components in the electrical appliance.
Specifically, the power module 110 may include a transformer 111, a power control chip 112, a feedback module 113, and a wake-up module 114. The transformer 111 includes a primary side and a secondary side. The primary and secondary side windings may each comprise one or more sets. The power control chip 112 is connected to the primary side winding for controlling the on and off of the transformer 111 to transfer the energy of the primary side to the secondary side. The feedback module 113 is located on the secondary side, connected to the output end of the secondary side, and configured to collect a voltage output signal of the secondary side and feed back the collected voltage output signal to the power control chip 112. The power control chip 112 adjusts the on duty ratio of the power control chip 112 according to the feedback signal to reduce the fluctuation of the output voltage of the secondary side, so that the secondary side outputs a stable voltage output signal.
The wake-up module 114 is located on the primary side of the transformer 111 and is connected to a wake-up port of the power control chip 112. When a wake-up is required, the wake-up module 114 will generate a wake-up signal to wake up the power control chip 112. When the power control chip 112 is in an operating state, the on and off of the transformer 111 are controlled, and the energy of the primary side is transferred to the secondary side; in the protection or sleep state, it does not operate until the wake-up module 114 generates a wake-up signal.
The control module 120 may include a main control chip 121 and a shutdown module 122. The main control chip 121 generates a shutdown control signal when receiving a shutdown/standby instruction or detecting that other components of the electrical apparatus have stopped working. It can be understood that, in order to prevent the erroneous determination, the main control chip 121 performs timing by using a built-in timer when receiving the shutdown/standby instruction or detecting that other components of the electrical apparatus have stopped working, and generates a shutdown control signal when a predetermined time is reached. The shutdown module 122 is connected to an output port of the main control chip 121 to receive a shutdown control signal output by the main control chip 121. After receiving the shutdown control signal from the main control chip 121, the shutdown module 122 transmits the shutdown control signal to the power module 110, so that the power control chip 112 in the power module 110 enters a protection or sleep state. It is understood that whether the power control chip 112 enters the protection state or the sleep state can be flexibly set according to specific chip usage, and is not limited herein.
In the embodiment of the present invention, when the electrical device is in the standby state, the main control chip 121 generates a shutdown control signal, and the shutdown control signal is transmitted to the power control chip 111 through the shutdown module 122 to control the power control chip 111 to enter the protection or sleep state, so as to reduce the standby power consumption. Experiments prove that the standby power consumption can be below 5mW by the mode. In addition, the embodiment of the present invention further provides a wake-up module 114 in the power module, so as to wake up the power control chip 111 along with the operation of the electrical equipment. Therefore, the embodiment of the invention not only reduces the standby power consumption, but also is convenient to wake up.
Further, as shown in fig. 2, the shutdown module 122 may include a first switch Q1, and a base of the first switch Q1 is connected to an output port of the main control chip 121 to be turned on or off according to a shutdown control signal of the main control chip 121. The feedback module 113 includes a first optocoupler IC101, a first resistor R101, a second resistor R102, and a voltage regulator tube Z101. The first opto-coupler IC101 has four ports, i.e., a first input port (port 1), a second input port (port 2), a first output port (port 3), and a second output port (port 4). Wherein the port 3 and the port 4 are connected to the wake-up port (i.e., BP port) and the feedback port (i.e., FB port) of the power control chip 112. The collector of the first switch tube Q1 is connected to port 2 of the first optocoupler IC101, and the collector is also connected to port 1 of the first optocoupler IC101 via a first resistor R101. The emitter of the first switching tube Q1 is grounded. The anode of the voltage regulator tube Z101 is connected with the emitter of the first switch tube Q1, and the cathode is connected with the collector of the first switch tube Q1. The port 1 of the first optocoupler IC101 is further connected to a voltage output terminal on the secondary side via a second resistor R102.
When the electrical equipment is in a normal state, the power control chip 112 works normally to control the on and off of the transformer 111, so that the energy of the primary side is transferred to the secondary side. The dc signal output from the secondary side is used to drive the main control chip 121. The dc signal OUT output from the secondary side is also fed back to the power control chip 112 through the feedback module 113, so that the power control chip 112 controls the on duty ratio of the transformer 111 to output a stable dc signal. The method specifically comprises the following steps: assuming that a driving signal of the main control chip 121 is +5V, when the dc signal OUT exceeds +5V, the voltage at two ends of the first resistor R101 may drive the input end diode of the first optocoupler IC101, so as to transmit the feedback signal to the FB end (i.e., the feedback port) of the power control chip 112, and at this time, the power control chip 112 reduces the on-duty ratio of the transformer 111; when the dc signal OUT is smaller than +5V, the voltage at the two ends of the first resistor R101 is not enough to drive the input end diode of the first optocoupler IC101, and the FB end of the power control chip 112 cannot receive the feedback signal, so that the power control chip 112 increases the on-duty ratio of the transformer 111. The signal feedback through the feedback module 113 enables the secondary side to output a stable voltage signal.
When the electrical device is in a standby state, the main control chip 121 will generate a shutdown control signal STB, which is a high level signal. At this time, the first switch tube Q1 is turned on, the voltage regulator tube Z101 is short-circuited, and the dc signal OUT (+5V) output from the secondary side passes through the parallel circuit of the second resistor R102, the first resistor R101 and the diode at the input end of the first optocoupler IC101, so that the first optocoupler IC101 always operates, and therefore the FB terminal of the power control chip 112 continuously receives the feedback signal. The power control chip 112 performs timing through a built-in timer, and when the feedback signal lasts for a predetermined time, the power control chip 112 enters a protection or low power consumption state, i.e., stops working, thereby achieving the purpose of ultra-low standby power consumption.
In another embodiment, as shown in fig. 3, the shutdown module 122 may include a first switch Q1, and a base of the first switch Q1 is connected to an output port of the main control chip 121 to be turned on or off according to a shutdown control signal of the main control chip 121. The feedback module 113 includes a first optocoupler IC101, a first resistor R101, a second resistor R102, and a voltage regulator tube Z101. The first opto-coupler IC101 has four ports, i.e., a first input port (port 1), a second input port (port 2), a first output port (port 3), and a second output port (port 4). Wherein, the port 3 and the port 4 are connected with the wake-up port and the feedback port of the power control chip 112 correspondingly. The collector of the first switch tube Q1 is connected to port 2 of the first optocoupler IC101, and the collector is also connected to port 1 of the first optocoupler IC101 via a first resistor R101. The emitter of the first switching transistor Q1 is connected to ground via a second resistor R102. The anode of the voltage regulator tube Z101 is connected with the emitter of the first switch tube Q1, and the cathode is connected with the collector of the first switch tube Q1. A connection node between the port 1 of the first optocoupler IC101 and the first resistor R101 is further connected to a voltage output terminal on the secondary side.
The working principle of the signal feedback of the shutdown module 122 and the feedback module 113 in this embodiment is similar to that in the previous embodiment, and is not described herein again.
Further, as shown in fig. 4, the wake-up circuit 114 may include: the circuit comprises a first capacitor C101, a second capacitor C102, a third capacitor C103, a second switch tube Q2, a third resistor R103, a fourth resistor R104, a fifth resistor R105, a sixth resistor R106, a seventh resistor R107, a first diode D101 and a second diode D102.
The primary winding of the transformer 111 may include a main winding and an auxiliary winding. The auxiliary winding includes a first terminal and a second terminal, wherein the first terminal is connected to the BP port of the power control chip 112 via a fifth resistor R105 and a first diode D101. One end of the first capacitor C101 is connected to the BP port of the power control chip 112, and the other end is grounded. The emitter of the second switch tube Q2 is connected to the BP port of the power control chip 112, and the other end is grounded. The base of the second switch tube Q2 is connected to a gate switch DOOR and then grounded through the parallel circuit of the second capacitor C102 and the third resistor R103. The base of the second switch tube Q2 is also connected to the BP port of the power control chip 112 via a fourth resistor R104. One end of the third capacitor C103 is connected to the FB port of the power control chip 112, and the other end is connected to the BP port of the power control chip 112. The first end of the auxiliary winding is also grounded through a seventh resistor R107 and a sixth resistor R106 in sequence, and a connection node of the seventh resistor R107 and the sixth resistor R106 is connected with the FB port of the power control chip 112. The cathode of the second diode D102 is connected to the second end of the auxiliary winding, and the anode is grounded.
Under the normal working condition of the electrical equipment, the power control chip 112 controls the on and off of the transformer 111, and at this time, current is also generated in the auxiliary winding. The generated current is output from the first end and divided into two paths, one path of the current passes through the fifth resistor R105 and the first diode D101 to the BP port of the power control chip 112, and meanwhile, the first capacitor C101 is also charged; the other path of the signal passes through the seventh resistor R107 and the sixth resistor R106, and after the voltage division of the seventh resistor R107 and the sixth resistor R106, a voltage division signal is generated and output to the FB port of the power control chip 112.
When the electrical equipment is in a protection or sleep state, the power control chip 112 stops working and no current is generated in the auxiliary winding. Since a constant current source is built in the BP port of the power control chip 112, when the electrical device is in a protection or sleep state, the BP port of the power control chip 112 is always at a high level.
If the electrical equipment is in a protection or sleep state, the gate switch DOOR is closed, and the base of the second switch tube Q2 is at a low level. At this time, a voltage difference is formed between the emitter and the base of the second switching tube Q2, and the second switching tube Q2 is turned on. Since the electrical equipment is in a normal operating state and the first capacitor C101 is charged, when the second switch Q2 is turned on, the first capacitor C101 discharges, and is grounded through the second switch Q2, the gate switch DOOR, and the third resistor R103, thereby forming a discharge circuit. At the same time, the second capacitor C102 is charged. In order to enable the BP port of the power control chip 112 to receive a falling edge signal (i.e., a wake-up signal), the voltage of the first capacitor C101 is rapidly decreased from a high level to a low level. Since the first capacitor C101 and the second capacitor C102 are connected in parallel when the gate switch DOOR is closed, the second capacitor C102 may accelerate the discharge of the first capacitor C101. In this embodiment, the capacitance of the second capacitor C102 is larger than that of the first capacitor C101. Preferably, the capacitance of the second capacitor C102 is at least 10 times that of the first capacitor C101, for example, the capacitance of the first capacitor C101 is 0.1 μ F, and the capacitance of the second capacitor C102 is 1 μ F. When the BP port receives a falling edge signal, the power control chip 112 is awakened, exits from the sleep or protection state, and resumes operation, so that the electrical device can operate normally. After the power supply is restored to normal operation from the sleep or protection state, the power control chip 112 is still in the normal operation state regardless of whether the DOOR switch DOOR is open or closed.
In this embodiment, the resistance of the third resistor R103 may be set to be larger than the resistance of the fourth resistor R104, so that after the second switch Q2 is turned on, the second capacitor C102 may be turned off after being maintained for a period of time, and the BP port of the power control chip 112 is changed to a high level. Preferably, the resistance value of the third resistor R103 is at least 10 times the resistance value of the fourth resistor R104.
In addition, in order to ensure that the FB port of the power control chip 112 is at a low level when the feedback module 113 has no feedback signal output, the resistance of the seventh resistor R107 is greater than the resistance of the sixth resistor R106 in this embodiment. Preferably, the resistance of the seventh resistor R107 is at least 10 times the resistance of the sixth resistor R106, for example, if the sixth resistor R106 is 2K Ω, the value of the seventh resistor R107 is 20K Ω. The second diode D102 performs half-wave rectification and allows only positive voltages to pass. The third capacitor C103 is connected across the BP port and the FB port of the power control chip 112, and has a filtering effect.
In another embodiment, as shown in fig. 5, the difference from the above embodiment is that the wake-up module 113 controls the generation of the wake-up signal by two switching tubes, i.e., the third switching tube Q3 and the fourth switching tube Q4. The base of the third switch transistor Q3 is connected to the connection node between the fourth resistor R104 and the gate switch DOOR, the emitter is connected to the BP port of the power control chip 112, and the collector is connected to the emitter of the fourth switch transistor Q4. The collector of the fourth switching tube Q4 is grounded. In addition, the wake-up module 113 further includes an eighth resistor R108, a ninth resistor R109, and a tenth resistor R110. One end of the eighth resistor R108 is connected to the emitter of the third switching tube Q3, and the other end is connected to the collector of the third switching tube Q3. The ninth resistor R109 is connected in series with the tenth resistor R110, one end of the series circuit is connected with the first end of the auxiliary winding, the other end of the series circuit is grounded, and the connection node of the ninth resistor R109 and the tenth resistor R110 is also connected with the base of the fourth switch tube Q4.
Under the normal working condition of the electrical equipment, the power control chip 112 controls the on and off of the transformer 111, and at this time, current is also generated in the auxiliary winding. The generated current is output from the first end and divided into three paths, one path of the current passes through the fifth resistor R105 and the first diode D101 to reach the BP port of the power supply control chip 112, and meanwhile, the first capacitor C101 is also charged; the other path is grounded through a seventh resistor R107 and a sixth resistor R106, and generates a voltage division signal after voltage division through the seventh resistor R107 and the sixth resistor R106, and outputs the voltage division signal to the FB port of the power control chip 112; the other path is grounded through a ninth resistor R109 and a tenth resistor R110. Since the eighth resistor R108 is set to have a large resistance, for example, 2M, to prevent the fourth switching tube Q4 from being turned on.
When the electrical equipment is in a protection or sleep state, the power control chip 112 stops working and no current is generated in the auxiliary winding. Since a constant current source is built in the BP port of the power control chip 112, when the electrical device is in a protection or sleep state, the BP port of the power control chip 112 is always at a high level.
If the electrical equipment is in a protection or sleep state, the gate switch DOOR is closed, and the base of the third switch tube Q3 is at a low level. At this time, a voltage difference is formed between the emitter and the base of the third switching tube Q3, and the third switching tube Q3 is turned on. Since the third transistor Q3 is turned on, a voltage is formed at the collector of the transistor Q3, and a voltage difference is formed between the emitter and the base of the fourth transistor Q4, and the third transistor Q3 is turned on. Because the electrical equipment is in a normal working state and charges the first capacitor C101, when the second switch tube Q2 is turned on, the first capacitor C101 discharges, and one path is grounded through the third switch tube Q3, the DOOR switch DOOR and the third resistor R103 to form a discharge loop; the other path is grounded through a third switch tube Q3, a fourth switch tube Q4 and a tenth resistor R110 to form a discharge loop. Simultaneously, the second capacitor C102 is charged. In order to enable the BP port of the power control chip 112 to receive a falling edge signal (i.e., a wake-up signal), the voltage of the first capacitor C101 is rapidly decreased from a high level to a low level. Since the first capacitor C101 and the second capacitor C102 are connected in parallel when the gate switch DOOR is closed, the second capacitor C102 may accelerate the discharge of the first capacitor C101. In this embodiment, the capacitance of the second capacitor C102 is larger than that of the first capacitor C101. Preferably, the capacitance of the second capacitor C102 is at least 10 times that of the first capacitor C101, for example, the capacitance of the first capacitor C101 is 0.1 μ F, and the capacitance of the second capacitor C102 is 1 μ F. When the BP port receives a falling edge signal, the power control chip 112 is awakened, exits from the sleep or protection state, and resumes operation, so that the electrical device can operate normally. After the power supply is restored to normal operation from the sleep or protection state, the power control chip 112 is still in the normal operation state regardless of whether the DOOR switch DOOR is open or closed.
In this embodiment, the resistance of the third resistor R103 may be set to be larger than the resistance of the fourth resistor R104, so that after the third switch Q3 and the fourth switch Q4 are turned on, the second capacitor C102 may be turned off after being maintained for a period of time, and the BP port of the power control chip 112 becomes high level again. Preferably, the resistance value of the third resistor R103 is at least 10 times the resistance value of the fourth resistor R104.
In addition, in order to ensure that the FB port of the power control chip 112 is at a low level when the feedback module 113 has no feedback signal output, the resistance of the seventh resistor R107 is greater than the resistance of the sixth resistor R106 in this embodiment. Preferably, the resistance of the seventh resistor R107 is at least 10 times the resistance of the sixth resistor R106, for example, if the sixth resistor R106 is 2K Ω, the value of the seventh resistor R107 is 20K Ω. The second diode D102 performs half-wave rectification and allows only positive voltages to pass. The third capacitor C103 is connected across the BP port and the FB port of the power control chip 112, and has a filtering effect.
Further, as shown in fig. 6 and 8, the low power consumption standby device of the present embodiment further includes: a zero crossing control module 115. The zero-crossing control module 115 has one end connected to the wake-up module 114 and the other end connected to the zero-crossing signal generating module 123 of the control module 120. The zero-crossing control module 115 controls the zero-crossing signal generating module 123 to be turned on or off according to the operating state of the power control chip 112.
Since the zero-crossing signal is important in controlling the electrical equipment, when the power control chip 112 enters the protection mode or the low power consumption mode, if the zero-crossing signal generating module 123 still works, a large amount of energy consumption still occurs, and therefore the zero-crossing signal generating module needs to be cut off as well, so that the standby power consumption can be further reduced.
Specifically, the zero-crossing control module 115 may include a first electrolytic capacitor E101, a second optocoupler IC102, and an eleventh resistor R111. The first electrolytic capacitor E101 is connected in parallel with the series circuit of the ninth resistor R109 and the tenth resistor R110, i.e. the positive terminal of the first electrolytic capacitor E101 is connected to the second terminal of the auxiliary winding of the transformer 111 and the negative terminal of the first electrolytic capacitor E101 is connected to ground. The positive end of the first electrolytic capacitor E101 passes through the eleventh resistor R111, then sequentially passes through the first primary port (port 1) and the second primary port (port 2) of the second optocoupler IC102, and then is grounded. A first secondary port (port 4) of the second optocoupler IC102 is connected with the zero line L, and a second secondary port (port 6) is connected with the zero-crossing signal generating module 123. It can be understood that, if the wake-up module has the circuit structure shown in fig. 4, the connection structure of the first electrolytic capacitor E101 and the second optocoupler IC102 in the zero-crossing control module 115 and the wake-up module circuit is similar to the previous connection structure, that is, the positive terminal of the first electrolytic capacitor E101 is connected to the second terminal of the auxiliary winding of the transformer 111, and the negative terminal of the first electrolytic capacitor E101 is connected to the ground. The positive end of the first electrolytic capacitor E101 passes through the eleventh resistor R111, then sequentially passes through the first primary port and the second primary port of the second optocoupler IC102, and then is grounded.
The zero-crossing signal generating module 123 may include a third optical coupler IC103, a twelfth resistor R112, a thirteenth resistor R113, and a fourth capacitor C104. The optocoupler IC103 has four ports, a port 1 is connected with a secondary port 4 of the optocoupler IC102, a port 2 is grounded, a port 3 is grounded, and a port 4 is connected with a +5V power supply through a twelfth resistor R112. The port 4 also outputs a ZERO-crossing signal ZERO via a thirteenth resistor R113. The output of the ZERO crossing signal ZERO is also connected to ground via a fourth capacitor C104.
Further, as shown in fig. 7 and 8, the power module 110 further includes a primary rectifying and filtering module 116 and a secondary rectifying and filtering module 117. The primary rectifying and filtering module 116 includes a full-wave rectifying unit 1161 and a primary filtering unit 1162. The primary filtering unit 1162 may be a pi-type filter, but may be replaced by other filters, such as a band-pass filter composed of an inductor and a capacitor. After the energy of the primary side is transferred to the secondary side, the transformer 111 outputs a dc voltage signal through the secondary rectifying and filtering module 117 to drive the main control chip 121 to operate. That is, the main control chip 121 starts to work under the excitation of the dc voltage, and when the electrical apparatus is in the standby mode and exceeds a certain time, the main control chip 121 may act on the feedback module 113 in the power module 110 through the shutdown module 122, so that the power control chip 112 enters a specific state, such as a protection or sleep state, thereby greatly reducing the standby power consumption.
Further, when the power control chip 112 controls the transformer 111 to turn off from on, a large spike voltage is generated on the primary side of the transformer 111, and in order to reduce the spike voltage, the RCD snubber circuit 118 is used to ensure safety.
Specifically, as shown in fig. 8, in the primary side of the transformer 111, the full-wave rectification unit 1161 may include a full-wave rectification bridge formed by 4 diodes, i.e., a third diode D103, a fourth diode D104, a fifth diode D105, and a sixth diode D106. The primary filter unit 1162 includes an inductor and two electrolytic capacitors, i.e., a first inductor L101, a second electrolytic capacitor E102, and a third electrolytic capacitor E103. The RCD snubber circuit 118 includes a seventh diode D107, a fourteenth resistor R114, a fifteenth resistor R115, a sixteenth resistor R116, and a fifth capacitor C105. In order to achieve a better peak voltage absorption effect, in this embodiment, the fourteenth resistor R114 is 100 Ω, the fifteenth resistor R115 and the sixteenth resistor R116 are 100K Ω, the fifth capacitor C105 is 1nF, and the withstand voltage is 1 KV.
Because the conventional household appliance has at least two direct current power supplies, namely +5V and +12V, wherein the +5V provides power support for the main control chip, and the +12V provides drive for loads, such as a relay and the like. In order to ensure the output of positive voltage, half-wave rectification filtering is adopted and consists of a diode and a capacitor. The half-wave rectification includes an eighth diode D108 and a ninth diode D109. The pi-type filter comprises a second inductor L102, a fourth electrolytic capacitor E104, a fifth electrolytic capacitor E105 and a sixth electrolytic capacitor E106. In addition, the seventeenth resistor R117 and the sixth capacitor C106 are connected in series to form a buffer, which can absorb the spike voltage generated on the secondary side and reduce the reverse recovery time of the eighth diode D108 and the ninth diode D109.
The low-power consumption standby device can be applied to electric equipment with an opening and closing door, such as a microwave oven and an oven. When the electrical device is in a standby state or a shutdown state, the main control chip 121 feeds a shutdown control signal back to the power control chip 112 through the shutdown module 122, so that the power control chip 112 stops working and enters a protection or sleep state. When the switch door of the electrical equipment is opened, the power control chip 112 is awakened to work again. The application of the low power consumption standby device in the electric appliance is specifically described in the following with a microwave oven.
As shown in fig. 9, fig. 9 is a schematic view of electrical connections of a low power consumption microwave oven, in which BR represents a brown color beam, BL represents a blue color beam, BK represents a black color beam, WH represents a white color beam, RD represents a red color beam, and YW represents a yellow color beam. The live wire L of the commercial power passes through the fuse and the temperature controller, and one path of the live wire L is directly connected to the fan motor without passing through the first interlock and is connected to the strong current end of the microwave relay; other loads are connected to a strong current end of a barbecue relay, a barbecue temperature controller and a barbecue tube through a first interlock, namely a main interlock, and one path of the other load is connected to a zero line; the other path is connected to the primary side of the transformer, the turntable motor, the microwave relay and the zero line. Wherein the terminals of the primary side of the transformer, i.e. the terminals of the turntable motor, are connected in parallel with a second, i.e. monitoring, interlock. The third interlock is connected with the electric control board, namely a door monitoring interlock switch.
In the electric appliance structure of the low-power consumption microwave oven, the states of the second interlock and the third interlock are correspondingly changed through the states of opening and closing the door of the microwave oven. The method specifically comprises the following steps: when the switch door of the microwave oven is in a door closing state, the second interlock is disconnected; when the switch door of the microwave oven is in the door opening state, the second interlock is closed. Therefore, through the second interlocking, when the switch door of the microwave oven is in a door opening state, if the first interlocking fails, namely the first interlocking is adhered, the second interlocking can cause the air switch action by the short circuit of the mains supply, and the microwave leakage is prevented. The third interlock is equivalent to the DOOR opening DOOR in the low-power standby device, and when the switch DOOR of the microwave oven is in a DOOR closing state, the third interlock is disconnected; when the switch door of the microwave oven is in the door opening state, the third interlock is closed.
The low-power-consumption standby device is arranged in the electric control board, or the low-power-consumption standby device is the electric control board. The electric control board obtains a mains supply power signal through a port CN1, and can directly drive an oven lamp-direct current LED lamp and drive a barbecue and microwave relay to start corresponding loads. When the microwave oven is in a standby state, after a period of time is timed, the main control MCU of the control module of the electric control board enables the power control chip of the microwave oven to be in a protection or dormant state by starting the shutdown module, so as to reduce the standby power consumption of the microwave oven.
When the user opens the switch door of the microwave oven, the power control chip of the electric control board restarts the operation through the third interlocking switch on the electric control board.
As shown in fig. 10, when the low power consumption microwave oven is in operation, the method may include the following steps:
s1, opening a microwave oven switch door, and closing a third interlock;
and when the opening and closing door is detected to be opened, the third linkage is in a closed state.
S2, the wake-up module generates a wake-up signal to enable the power control chip to work normally;
when the third interlock, that is, the switch gate DOOR of the wake-up module in the low-power-consumption standby device is closed, the wake-up module generates a wake-up signal of a falling edge, and transmits the wake-up signal to the BP port of the power control chip, so that the power control chip exits from the sleep or protection state and starts to work normally. Namely, the on and off of the transformer are controlled, so that the energy of the primary side of the transformer is transferred to the secondary side to supply power to the load and the main control chip.
S3, the main control chip of the electric control board is powered on and works normally;
the main control chip obtains an output voltage signal of the secondary side of the transformer and starts to work normally.
S4, starting cooking according to the operation of the user;
a user may perform cooking operations, such as cooking, steaming, baking, etc., through a microwave oven.
S5, judging whether cooking is finished or not; if yes, go to step S6, otherwise return to step S4;
the main control chip also judges whether cooking is finished, for example, whether other components stop working, whether a shutdown or standby instruction is received, and the like.
S6, entering a standby state and timing;
and when the cooking is judged to be finished, entering a standby state, and simultaneously timing the cooking by the main control chip.
S7, if the standby time exceeds N minutes, the step S8 is switched to, otherwise, the step S6 is returned to;
and S8, the main control chip starts the shutdown module to enable the power control chip to enter a protection or dormancy state so as to realize low power consumption.
When the standby time exceeds N minutes, the main control chip generates a high-level shutdown control signal to be fed back to the FB port of the power control chip through the shutdown module, so that the power control signal enters a protection or dormancy state.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A low-power consumption standby device is applied to electrical equipment with a switch door and is characterized by comprising a power module and a control module; wherein,
the power supply module comprises a transformer, a power supply control chip, a feedback module and a wake-up module; the feedback module is positioned on the secondary side of the transformer, is connected with the output end of the secondary side, and is used for acquiring a voltage output signal of the secondary side and feeding back the acquired voltage output signal to a feedback port of the power control chip; the power control chip is connected with the primary side winding of the transformer and used for controlling the conduction and the disconnection of the transformer and adjusting the conduction duty ratio of the transformer according to a feedback signal; the wake-up module is positioned on the primary side of the transformer, is connected with a wake-up port of the power control chip and is used for generating a wake-up signal when a switch door of the electrical equipment is opened;
the control module comprises a main control chip and a shutdown module connected with the main control chip; the main control chip generates a shutdown control signal, and the shutdown module and the feedback module transmit the shutdown control signal to the feedback module so as to feed back the shutdown control signal to the power supply control chip through the feedback module, so that the power supply control chip enters a dormant or protection state.
2. The low power consumption standby device according to claim 1, wherein the shutdown module comprises a first switch tube, and a base of the first switch tube is connected with an output port of the main control chip;
the feedback module comprises a first optocoupler, a first resistor, a second resistor and a voltage regulator tube; a first output port and a second output port of the first optocoupler are correspondingly connected with a feedback port and a wake-up port of the power control chip; a collector electrode of the first switch tube is connected with a first input port of the first optocoupler through a first resistor, and the collector electrode is also connected with a second input port of the first optocoupler; the emitter of the first switch tube is grounded; the anode of the voltage-stabilizing tube is connected with the emitter of the first switch tube, and the cathode of the voltage-stabilizing tube is connected with the collector of the first switch tube; and a first input port of the first optocoupler is also connected with a voltage output end on the secondary side of the transformer through a second resistor.
3. The low power consumption standby device according to claim 1, wherein the shutdown module comprises a first switch tube, and a base of the first switch tube is connected with an output port of the main control chip;
the feedback module comprises a first optocoupler, a first resistor, a second resistor and a voltage regulator tube; a first output port and a second output port of the first optocoupler are correspondingly connected with a feedback port and a wake-up port of the power control chip; a collector electrode of the first switch tube is connected with a first input port of the first optocoupler through a first resistor, and the collector electrode is also connected with a second input port of the first optocoupler; the emitter of the first switching tube is grounded through a second resistor; the anode of the voltage-stabilizing tube is connected with the emitter of the first switch tube, and the cathode of the voltage-stabilizing tube is connected with the collector of the first switch tube; and the connection node of the first input port of the first optocoupler and the first resistor is also connected with the voltage output end of the secondary side of the transformer.
4. The low power consumption standby device according to claim 1, wherein the wake-up module comprises a first capacitor, a second switch tube, a gate switch, a third resistor, a fourth resistor, a fifth resistor, a first diode; one end of the auxiliary winding of the transformer is connected with the awakening port of the power control chip through a fifth resistor and a first diode; one end of the first capacitor is connected with the awakening port of the power control chip, and the other end of the first capacitor is grounded; an emitting electrode of the second switching tube is connected with the awakening port of the power control chip, and the other end of the second switching tube is grounded; the base electrode of the second switch tube is connected with the gate switch and then grounded through a parallel circuit of a second capacitor and a third resistor; and the base electrode of the second switching tube is also connected with the awakening port of the power supply control chip through a fourth resistor.
5. The low power standby device of claim 1, wherein the wake-up module comprises: the switch comprises a first capacitor, a second capacitor, a third switch tube, a fourth switch tube, a gate switch, a third resistor, a fourth resistor, a fifth resistor, an eighth resistor, a ninth resistor, a tenth resistor and a first diode; one end of the first capacitor is connected with the awakening port of the power control chip, and the other end of the first capacitor is grounded; an emitter of the third switch tube is connected with the awakening port of the power control chip, a collector of the third switch tube is connected with an emitter of the fourth switch tube, and a collector of the fourth switch tube is grounded; one end of the eighth resistor is connected with the emitting electrode of the third switching tube, and the other end of the eighth resistor is connected with the collector electrode of the third switching tube;
the first end of the auxiliary winding of the transformer is connected with the awakening port of the power control chip through a fifth resistor and a first diode; one path of a base electrode of the third switching tube is connected with the awakening port of the power control chip through a fourth resistor, and the other path of the base electrode of the third switching tube is connected with the gate switch and then grounded through a parallel circuit of a second capacitor and a third resistor; the first end of the auxiliary winding of the transformer is grounded after sequentially passing through a ninth resistor and a tenth resistor, and a connecting node of the ninth resistor and the tenth resistor is connected with the base electrode of the fourth switching tube.
6. The low power standby device of claim 4 or 5, wherein said wake-up circuit further comprises a sixth resistor, a seventh resistor; the first end of the auxiliary winding of the transformer is grounded through a seventh resistor and a sixth resistor in sequence, and a connecting node of the seventh resistor and the sixth resistor is connected with a feedback port of the power supply control chip.
7. The low power consumption standby device according to claim 4 or 5, wherein the wake-up circuit further comprises a third capacitor, one end of the third capacitor is connected to the feedback port of the power control chip, and the other end of the third capacitor is connected to the wake-up port of the power control chip.
8. The low power standby device of any one of claims 1-5, wherein the low power standby device further comprises:
and one end of the zero-crossing control module is connected with the awakening module, and the other end of the zero-crossing control module is connected with the zero-crossing signal generation module of the control module and used for controlling the zero-crossing signal generation module to be turned on or turned off according to the working state of the power control chip.
9. The low power consumption standby device according to claim 8, wherein the zero-crossing control module comprises a first electrolytic capacitor, a second optical coupler, an eleventh resistor; the positive end of the first electrolytic capacitor is connected with the first end of the auxiliary winding of the transformer, and the negative end of the first electrolytic capacitor is grounded; the positive end of the first electrolytic capacitor passes through an eleventh resistor and then sequentially passes through a first primary port and a second primary port of the second optocoupler and then is grounded; and a first secondary port of the second optocoupler is connected with a zero line L, and a second secondary port of the second optocoupler is connected with the zero-crossing signal generating module.
10. An electrical apparatus comprising an opening and closing door; the electrical equipment is characterized by further comprising an electric control board and a door monitoring interlock, wherein the electric control board is provided with the low-power-consumption standby device as claimed in any one of claims 1 to 9, a door switch of the low-power-consumption standby device is the door monitoring interlock, and the door monitoring interlock is disconnected when a door is opened and closed; when the switch door of the electrical equipment is in a door opening state, the door is monitored and interlocked to be closed.
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| CN111365826A (en) * | 2020-04-21 | 2020-07-03 | 珠海拓芯科技有限公司 | Power supply system and air conditioner |
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