CN215601206U - Power supply circuit, circuit board and electrical apparatus - Google Patents

Power supply circuit, circuit board and electrical apparatus Download PDF

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CN215601206U
CN215601206U CN202121242366.1U CN202121242366U CN215601206U CN 215601206 U CN215601206 U CN 215601206U CN 202121242366 U CN202121242366 U CN 202121242366U CN 215601206 U CN215601206 U CN 215601206U
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selection
energy storage
resistor
terminal
storage device
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徐俊
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Guangdong Meizhi Compressor Co Ltd
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Guangdong Meizhi Compressor Co Ltd
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Abstract

The embodiment of the utility model discloses a power circuit, a circuit board and an electric appliance, wherein the power circuit performs voltage regulation through a voltage regulation module comprising at least three energy storage devices which are mutually connected in series, the working state of the energy storage devices is regulated through a first switch module to change the voltage regulation multiple of the voltage regulation module on an electric signal, and the regulation output end is switched through an output switching module, so that different voltage values can be output, the voltage regulation range of the power circuit is expanded, and the voltage regulation requirements of various different working conditions are met.

Description

Power supply circuit, circuit board and electrical apparatus
Technical Field
The utility model relates to the technical field of power supply, in particular to a power circuit, a circuit board and an electric appliance.
Background
Most of the existing electronic devices need to operate under different working conditions, and accordingly, the output of the power supply circuit needs to be matched with the operation requirements of the electronic devices. Taking the inverter air conditioner as an example, different rotating speed requirements exist under different working conditions, so that a power circuit of the inverter air conditioner needs to be adjusted correspondingly. In the related art, voltage regulation is generally realized by means of a switching power supply and the like, and the voltage regulation range of the above-mentioned manner is fixed, so that the voltage regulation requirements of various different working conditions cannot be met.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides a power circuit, a circuit board and an electric appliance, which can meet the voltage regulation requirements of various working conditions.
In one aspect, an embodiment of the present invention provides a power supply circuit, including:
the rectification module is used for rectifying the electric signal;
the voltage regulation module is used for carrying out voltage regulation on the electric signal and comprises at least three energy storage devices which are connected in series;
the first switch module is used for adjusting the working state of the energy storage device so as to change the voltage regulation multiple of the voltage regulation module on the electric signal, and the first switch module is respectively connected with the rectification module and the voltage regulation module;
the adjusting output end is connected with the energy storage device;
and the output switching module is used for switching the adjusting output end and is connected with the adjusting output end.
The power supply circuit according to the embodiment of the utility model has at least the following beneficial effects:
carry out voltage control through the voltage regulation module including the energy storage device of at least three mutual series connection, adjust through first switch module the operating condition of energy storage device is in order to change the voltage regulation module is right the voltage regulation multiple of the signal of telecommunication, rethread output switching module switches the processing to adjusting the output to can export different voltage value, improve power supply circuit's voltage control scope, satisfy the voltage control demand of multiple different operating modes.
According to some embodiments of the present invention, the rectifying module comprises a full-bridge rectifier formed by four diodes connected together, the full-bridge rectifier comprises a first rectifying input terminal, a first rectifying output terminal and a second rectifying output terminal, and the first switch module is respectively connected to the first rectifying input terminal, the first rectifying output terminal and the second rectifying output terminal.
According to some embodiments of the present invention, the voltage regulation module comprises a first energy storage device, a second energy storage device and a third energy storage device connected in series with each other, the first switching module comprises a first switching device and a second switching device, the first switching device comprises a first fixed terminal, a first selection terminal and a second selection terminal, and the second switching device comprises a second fixed terminal, a third selection terminal, a fourth selection terminal and a fifth selection terminal;
the first fixed end is connected with the first rectification output end, the first selection end and the second selection end are correspondingly connected with the two ends of the first energy storage device respectively, the second fixed end is connected with the first rectification input end, the third selection end and the fourth selection end are correspondingly connected with the two ends of the second energy storage device respectively, the fourth selection end and the fifth selection end are correspondingly connected with the two ends of the third energy storage device respectively, and the fifth selection end is connected with the second rectification output end.
According to some embodiments of the present invention, the adjusting output terminal includes a first adjusting output terminal, a second adjusting output terminal and a third adjusting output terminal, the first adjusting output terminal and the second adjusting output terminal are respectively connected to two ends of the first energy storage device, and the third adjusting output terminal is connected to the fifth selecting terminal;
the output switching module comprises a second switch module, the second switch module comprises an eighth selection end and a ninth selection end, the eighth selection end is connected with the first adjusting output end, and the ninth selection end is connected with the second adjusting output end.
According to some embodiments of the utility model, the second switch module comprises a first switch tube, a second switch tube, a first resistor, a second resistor, a third resistor and a fourth resistor, the first adjusting output end, the first resistor, the second resistor and the second adjusting output end are connected in series in sequence, the first switch tube comprises a first control end, a first action end and a second action end, the second switch tube comprises a second control end, a third action end and a fourth action end, the eighth selection terminal is the first action terminal, the ninth selection terminal is the third action terminal, the fourth fixed end is the second action end, the first control end and the second control end are connected between the first resistor and the second resistor, the third resistance is connected respectively the first control end with the fourth stiff end, the fourth resistance is connected respectively fourth action end and fourth stiff end.
According to some embodiments of the utility model, the voltage regulation module further comprises a fourth energy storage device, and the first energy storage device, the second energy storage device, the third energy storage device and the fourth energy storage device are sequentially connected in series;
the first switch module further comprises a third switch device, the third switch device comprises a third fixed end, a sixth selection end and a seventh selection end, the fifth selection end is connected with the sixth selection end, the third fixed end is connected with the second rectification output end, and the sixth selection end and the seventh selection end are correspondingly connected with two ends of the fourth energy storage device respectively.
According to some embodiments of the present invention, the adjusting output terminals include a first adjusting output terminal, a second adjusting output terminal, a third adjusting output terminal and a fourth adjusting output terminal, the first adjusting output terminal and the second adjusting output terminal are respectively and correspondingly connected to two ends of the first energy storage device, and the third adjusting output terminal and the fourth adjusting output terminal are respectively and correspondingly connected to two ends of the fourth energy storage device;
the output switching module comprises a second switch module and a third switch module, the second switch module comprises an eighth selection end and a ninth selection end, the eighth selection end is connected with the first adjusting output end, and the ninth selection end is connected with the second adjusting output end; the third switching module comprises a tenth selection terminal and an eleventh selection terminal, the tenth selection terminal is connected with the third adjusting output terminal, and the eleventh selection terminal is connected with the fourth adjusting output terminal.
According to some embodiments of the utility model, the second switch module comprises a first switch tube, a second switch tube, a first resistor, a second resistor, a third resistor and a fourth resistor, the first adjusting output end, the first resistor, the second resistor and the second adjusting output end are connected in series in sequence, the first switch tube comprises a first control end, a first action end and a second action end, the second switch tube comprises a second control end, a third action end and a fourth action end, the eighth selection terminal is the first action terminal, the ninth selection terminal is the third action terminal, the fourth fixed end is the second action end, the first control end and the second control end are connected between the first resistor and the second resistor, the third resistor is respectively connected with the first control end and the fourth fixed end, and the fourth resistor is respectively connected with the fourth action end and the fourth fixed end;
the third switch module comprises a third switch tube, a fourth switch tube, a fifth resistor, a sixth resistor, a seventh resistor and an eighth resistor, the third adjusting output end, the fifth resistor, the sixth resistor and the fourth adjusting output end are connected in series in sequence, the third switching tube comprises a third control end, a fifth action end and a sixth action end, the fourth switching tube comprises a fourth control end, a seventh action end and an eighth action end, the tenth selection terminal is the fifth action terminal, the eleventh selection terminal is the seventh action terminal, the fifth fixed end is the eighth action end, the third control end and the fourth control end are connected between the fifth resistor and the sixth resistor, the seventh resistor is connected with the sixth action end and the fifth fixed end respectively, and the eighth resistor is connected with the third control end and the fifth fixed end respectively.
According to some embodiments of the utility model, a power output terminal is connected to the output switching module;
and the filtering module is connected with the power output end.
According to some embodiments of the utility model, the energy storage device is an electrolytic capacitor.
On the other hand, the embodiment of the utility model also provides a circuit board which comprises the power circuit.
Therefore, the circuit board according to the embodiment of the utility model has at least the following beneficial effects:
carry out voltage control through the voltage regulation module including the energy storage device of at least three mutual series connection, adjust through first switch module the operating condition of energy storage device is in order to change the voltage regulation module is right the voltage regulation multiple of the signal of telecommunication, rethread output switching module switches the processing to adjusting the output to can export different voltage value, improve power supply circuit's voltage control scope, satisfy the voltage control demand of multiple different operating modes.
On the other hand, the embodiment of the utility model also provides an electric appliance, which comprises the power supply circuit.
Therefore, the electric appliance provided by the embodiment of the utility model has at least the following beneficial effects:
carry out voltage control through the voltage regulation module including the energy storage device of at least three mutual series connection, adjust through first switch module the operating condition of energy storage device is in order to change the voltage regulation module is right the voltage regulation multiple of the signal of telecommunication, rethread output switching module switches the processing to adjusting the output to can export different voltage value, improve power supply circuit's voltage control scope, satisfy the voltage control demand of multiple different operating modes.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The utility model is further described with reference to the following figures and examples, in which:
fig. 1 is a block diagram of an overall structure of a power supply circuit according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a power circuit according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of an output switching module according to an embodiment of the present invention;
fig. 4 is another schematic circuit diagram of an output switching module according to an embodiment of the present invention;
FIG. 5 is another circuit schematic of a power circuit provided by an embodiment of the utility model;
fig. 6 is another schematic circuit diagram of an output switching module according to an embodiment of the present invention;
fig. 7 is another schematic circuit diagram of an output switching module according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to, for example, the upper, lower, etc., is indicated based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
In the description of the present invention, a plurality means two or more. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Most of the existing electronic devices need to operate under different working conditions, and accordingly, the output of the power supply circuit needs to be matched with the operation requirements of the electronic devices. The motor of the air conditioner compressor rotates at different speeds under different working conditions, when the motor rotates at a high speed, the induced back electromotive force is large, the direct current bus voltage is required to be high, otherwise, the weak magnetism is required to be performed, and the efficiency of the motor is reduced. When the motor is in a low rotating speed, the energy consumption is overlarge due to overlarge voltage, and the service life of the capacitive device is easy to reduce when the capacitive device works in a high-voltage environment for a long time. At present, voltage standards of various countries are different, and power circuits of driving motors are also required to have good voltage compatibility, so that the power circuits need to be adjusted correspondingly. In the related art, voltage regulation is generally realized by means of a switching power supply and the like, and the voltage regulation range of the above-mentioned manner is fixed, so that the voltage regulation requirements of various different working conditions cannot be met. In addition, the BUCK circuit or the BOOST circuit may be used for voltage regulation, which has high efficiency, but high cost, needs to consider the problem of electromagnetic interference, and also has the problem of fixed voltage regulation range.
Based on the power circuit, the circuit board and the electric appliance, the voltage regulation requirements of various working conditions can be met.
Referring to fig. 1, an embodiment of the present invention provides a power circuit, which includes a rectification module 101, a voltage regulation module 103, a first switch module 102, a regulation output terminal, an output switching module 104, and a power output terminal.
The rectifying module 101 is used for rectifying an electrical signal.
The voltage regulating module 103 may be configured to perform voltage regulation on the electrical signal, and the voltage regulating module 103 includes three energy storage devices, which are connected in series with each other.
The first switching module 102 may be configured to adjust an operating state of the energy storage device, so as to change a voltage regulation multiple of the voltage regulation module 103 for the electrical signal, where the first switching module 102 is connected to the rectifying module 101 and the voltage regulation module 103, respectively.
The energy storage device is connected with the adjusting output end; the output switching module 104 may be configured to perform switching processing on the adjustment output end, where the adjustment output end is connected to the output switching module 104, and the output switching module 104 is connected to the power output end.
In a possible implementation manner, the energy storage device may be an electrolytic capacitor, or other components capable of storing electric energy, and the embodiment of the present invention is described by taking the energy storage device as an example of an electrolytic capacitor.
Carry out voltage control through the voltage regulation module 103 including the energy storage device of three mutual series connection, through the operating condition of first switch module 102 adjustment energy storage device to change the voltage regulation multiple of voltage regulation module 103 to the signal of telecommunication, rethread output switching module 104 switches the processing to adjusting the output, thereby can export different voltage value, improve power supply circuit's voltage control scope, satisfy the voltage control demand of multiple different operating modes.
Referring to fig. 1 and 2, in one possible implementation, the rectification module 101 may include a full-bridge rectifier, wherein the full-bridge rectifier may be obtained by connecting four diodes;
the full-bridge rectifier comprises a first rectifying input terminal 201, a second rectifying input terminal 202, a first rectifying output terminal 203 and a second rectifying output terminal 204;
the first switch module 102 is connected to the first rectification input terminal 201;
the first switch module 102 is connected to the first rectification output terminal 203;
the first switch module 102 is connected to the second rectification output terminal 204.
Specifically, the electrical signal input by the power circuit is an alternating current electrical signal, the first rectifying input terminal 201 is used for connecting to the zero line, the second rectifying input terminal 202 is used for connecting to the live line, the rectifying module 101 includes a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4, the cathode of the first diode D1 is connected to the anode of the second diode D2, the second rectifying input terminal 202 is connected between the first diode D1 and the second diode D2, the cathode of the third diode D3 is connected to the cathode of the second diode D2, the anode of the third diode D3 is connected to the cathode of the fourth diode D4, the anode of the fourth diode D4 is connected to the anode of the first diode D1, the first rectifying input terminal 201 is connected between the third diode D3 and the fourth diode D4, the first rectifying output terminal 203 is connected between the second diode D2 and the third diode D3, the second rectifying output terminal 204 is connected between the first diode D1 and the fourth diode D4, by providing the rectifying module 101, the ac power signal inputted from the first rectifying input terminal 201 and the second rectifying input terminal 202 can be converted into a dc power signal.
In one possible implementation, referring to fig. 2, the voltage regulation module 103 includes a first energy storage device C1, a second energy storage device C2, and a third energy storage device C3, the first energy storage device C1, the second energy storage device C2, and the third energy storage device C3 are connected in series, the first switching module 102 includes a first switching device S1 and a second switching device S2, the first switching device S1 includes a first fixed end 2501, a first selection end 2502, and a second selection end 2503, and the second switching device S2 includes a second fixed end 2601, a third selection end 2602, a fourth selection end 2603, and a fifth selection end 2604; the first fixed end 2501 is connected with the first rectification output end 203;
the first selection terminal 2502 is connected with one end of the first energy storage device C1, and the second selection terminal 2503 is connected with the other end of the first energy storage device C1;
the second fixed end 2601 is connected to the first rectification input end 201;
the third selection terminal 2602 is connected to one end of the second energy storage device C2, and the fourth selection terminal 2603 is connected to the other end of the first energy storage device C1;
the fourth selection terminal 2603 is connected to one end of the third energy storage device C3, the fifth selection terminal 2604 is connected to the other end of the third energy storage device C3, and the fifth selection terminal 2604 is connected to the second rectification output terminal 204.
When the first switch device S1 selects the first selection terminal 2502, the first fixing terminal 2501 is electrically connected to the first selection terminal 2502, and when the second selection terminal 2503 is selected by the first switch device S1, the first fixing terminal 2501 is electrically connected to the second selection terminal 2503; when the second switching device S2 selects the third selection terminal 2602, the second fixed terminal 2601 is conducted with the third selection terminal 2602, when the fourth selection terminal 2603 is selected by the second switching device S2, the second fixed terminal 2601 is conducted with the fourth selection terminal 2603, and when the fifth selection terminal 2604 is selected by the second switching device S2, the second fixed terminal 2601 is conducted with the fifth selection terminal 2604. The first switching device S1 may be a single-pole double-throw switch, and the second switching device S2 may be a single-pole triple-throw switch, or in an embodiment of the present invention, the first switching device may also be implemented by using a switching circuit with other functional types, and the embodiment of the present invention is not limited thereto.
Therefore, different multiples of voltage regulation effects can be achieved by controlling the first switching device S1 and the second switching device S2, wherein the control of the first switching device S1 and the second switching device S2 can be achieved by an MCU (not shown in the drawings). The voltage regulation principle of the embodiment of the present invention is explained in detail below, and assuming that the rectified voltage value of the input ac signal is Vm, there are three voltage regulation cases:
firstly, when the first switching device S1 selects the second selection terminal 2503 and the second switching device S2 is kept off, the first energy storage device C1 does not work, the second energy storage device C2 and the third energy storage device C3 are connected in series to form a filter capacitor, and finally the voltage regulation module 103 can output a dc signal with a voltage value Vm;
second, in the positive half cycle of the ac signal, when the second selection terminal 2503 is selected by the first switching device S1 and the fourth selection terminal 2603 is selected by the second switching device S2, the second energy storage device C2 is in a charged state;
during the negative half cycle of the alternating current signal, when the second selection terminal 2503 is selected by the first switching device S1 and the fourth selection terminal 2603 is selected by the second switching device S2, the third energy storage device C3 is in a charging state, and finally the voltage regulation module 103 can output a direct current signal with a voltage value of 2 Vm;
third, in the first positive half-cycle of the ac signal, the second energy storage device C2 is in a charged state when the second selection terminal 2503 is selected by the first switching device S1 and the fourth selection terminal 2603 is selected by the second switching device S2;
during the first negative half cycle of the ac signal, keeping the third energy storage device C3 charged while the second selection terminal 2503 is selected by the first switching device S1 and the fourth selection terminal 2603 is selected by the second switching device S2;
next, in the second positive half cycle of the ac power signal, when the first selection terminal 2502 is selected by the first switching device S1 and the third selection terminal 2602 is selected by the second switching device S2, the first energy storage device C1 is in a charged state;
in the first negative half cycle of the ac power signal, when the second selection terminal 2503 is selected by the first switching device S1 and the fourth selection terminal 2603 is selected by the second switching device S2, the third energy storage device C3 is in a charging state, and finally the voltage regulating module 103 can output a dc power signal with a voltage value of 3 Vm.
Therefore, the voltage regulation module 103 in the above embodiment can output three voltage values of different multiples, thereby improving the voltage regulation range of the power circuit and meeting the voltage regulation requirements of various different working conditions.
Accordingly, referring to fig. 2, 3, in one possible implementation, the regulation outputs include a first regulation output 2701, a second regulation output 2702, and a third regulation output 2703;
the first regulation output 2701 is connected with one end of the first energy storage device C1, and the second regulation output 2702 is connected with the other end of the first energy storage device C1;
the third adjustment output 2703 is connected to the fifth selection terminal 2604.
The output switching module 104 is used for switching the first adjustment output 2701, the second adjustment output 2702 and the third adjustment output 2703 according to the action conditions of the first switching device S1 and the second switching device S2.
The output switching module 104 includes a second switching module S4, the second switching module S4 includes a fourth fixed terminal 3101, an eighth selection terminal 3102 and a ninth selection terminal 3103, the eighth selection terminal 3102 is connected to the first adjustment output terminal 2701, the ninth selection terminal 3103 is connected to the second adjustment output terminal 2702, when the eighth selection terminal 3102 is selected by the second switching module S4, that is, the fourth fixed terminal 3101 is conducted with the eighth selection terminal 3102, at this time, the voltage value output by the power circuit is the voltage value between the first adjustment output terminal 2701 and the third adjustment output terminal 2703; when the ninth selection terminal 3103 is selected by the second switch module S4, that is, the fourth fixed terminal 3101 and the ninth selection terminal 3103 are conducted, the voltage value output by the power circuit is the voltage value between the second adjustment output terminal 2702 and the third adjustment output terminal 2703, thereby implementing the switching process of the adjustment output terminals. The power output terminal includes a first power output terminal 3201 and a second power output terminal 3202, the fourth fixed terminal 3101 is connected to the first power output terminal 3201, and the second rectification output terminal 204 is connected to the second power output terminal 3202.
It is understood that the second switch module S4 may be a single pole double throw switch and the control of the second switch module S4 may be implemented by a MCU.
In addition, referring to fig. 4, in one possible implementation, the second switching module S4 includes a first switching tube Q1, a second switching tube Q2, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4;
the first regulation output end 2701, the first resistor R1, the second resistor R2 and the second regulation output end 2702 are connected in series in sequence, the first switch tube Q1 comprises a first control end 4101, a first action end 4102 and a second action end 4103, and the second switch tube Q2 comprises a second control end 4201, a third action end 4202 and a fourth action end 4203;
the eighth selection terminal 3102 corresponds to the first action terminal 4102 in fig. 4;
the ninth selection terminal 3103 corresponds to the third action terminal 4202 in fig. 4;
the first control terminal 4101 is connected between the first resistor R1 and the second resistor R2;
the second control terminal 4201 is connected between the first resistor R1 and the second resistor R2;
the third resistor R3 is connected to the first control terminal 4101 and the second operation terminal 4103, respectively, and the fourth resistor R4 is connected to the fourth operation terminal 4203 and the second operation terminal 4103, respectively;
the second operating end 4103 corresponds to the fourth fixed end 3101 in fig. 3.
Illustratively, the first switching tube Q1 may be a PNP type triode, the second switching tube Q2 may be a PNP type fet, the base of the first switching tube Q1 is the first control terminal 4101, the emitter of the first switching tube Q1 is the first action terminal 4102, the collector of the first switching tube Q1 is the second action terminal 4103, the gate of the second switching tube Q2 is the second control terminal 4201, the source of the second switching tube Q2 is the third action terminal 4202, the drain of the second switching tube Q2 is the fourth action terminal 4203, when the first regulation output terminal 2701 has no voltage output (i.e. the first energy storage device C1 is not charged), and when there is a voltage output at the second regulation output terminal 2702, the first switching tube Q1 is in an off state, and under the partial pressure of the second resistor R2 and the third resistor R3, the voltage at the gate of the second switching tube Q2 is lower than the source of the second switching tube Q2, so that the second switching tube Q2 is lower than the voltage of the second switching tube Q2, the effect of the ninth selection terminal 3103 being selected by the second switch module S4 is achieved; when the first regulation output 2701 has a voltage output (i.e. the first energy storage device C1 is charged), under the voltage division effect of the first resistor R1 and the second resistor R2, the voltage at the base of the first switch Q1 is lower than the voltage at the emitter of the first switch Q1, so that current can flow from the emitter of the first switch Q1 to the base of the first switch Q1, thereby turning on the first switch Q1, and the voltage at the gate of the second switch Q2 is higher than the voltage at the source of the second switch Q2, thereby turning off the second switch Q2. Therefore, the second switch module S4 can automatically switch the regulation output end according to the output condition of the voltage regulation module 103, which is beneficial to reducing the occupation of the control resources of the MCU and improving the working efficiency of the power circuit. In addition, by arranging the fourth resistor R4, a voltage difference exists between the voltage of the second regulation output terminal 2702 and the first power output terminal 3201, so that a stable voltage drop exists between two ends of the second resistor R2, a voltage division effect is ensured, and the stability of actions of the first switch tube Q1 and the second switch tube Q2 is improved.
In addition, referring to fig. 4, the second switch module S4 may further include a fifth diode D5, and the fifth diode D5 may function to prevent current from flowing back and may function as a voltage drop from the second regulation output 2702 to the first power output 3201, so as to improve the stability of the operations of the first switch transistor Q1 and the second switch transistor Q2.
The operation principle of the power supply circuit will be described below by taking a motor as an example of a load of the power supply circuit.
The power supply circuit composed of the voltage regulation module 103 and the output selection module shown in fig. 2 and 3 has three operation modes, and can switch among the three operation modes according to the rotation speed of the motor, and assuming that the rectified voltage value of the input alternating current signal is Vm, specifically:
the first working mode is as follows:
when the rotating speed of the motor is less than the first threshold value, the MCU controls the first switching device S1 to select the second selection terminal 2503, the second switching device S2 is kept off, the ac signal is first input to the first rectification input terminal 201 and the second rectification input terminal 202, and in the positive half cycle of the ac signal, current flows from the second rectification input terminal 202, sequentially passes through the second diode D2, the first switching device S1, the second energy storage device C2, the third energy storage device C3, and the fourth diode D4, and returns to the first rectification input terminal 201;
in the negative half period of the alternating current signal, current flows from the first rectification input terminal 201, sequentially passes through the third diode D3, the first switching device S1, the second energy storage device C2, the third energy storage device C3, the first diode D1 and returns to the second rectification input terminal 202;
therefore, in one cycle of the ac power signal, the first energy storage device C1 does not operate, the second energy storage device C2 and the third energy storage device C3 are connected in series to form a filter capacitor, accordingly, the ninth selection terminal 3103 is selected by the second switch module S4, and the power circuit can finally output the dc power signal with the voltage value Vm.
And a second working mode:
when the rotating speed of the motor is greater than the first threshold and less than the second threshold, the MCU controls the first switching device S1 to select the second selection terminal 2503, the second switching device S2 to select the fourth selection terminal 2603, the ac signal is first input to the first rectification input terminal 201 and the second rectification input terminal 202, and in the positive half cycle of the ac signal, the current flows from the second rectification input terminal 202, passes through the second diode D2, the first switching device S1, the second energy storage device C2, and the second switching device S2 in sequence, and returns to the first rectification input terminal 201, and the second energy storage device C2 is in a charging state;
in the negative half period of the alternating current signal, current flows from the first rectification input end 201, sequentially passes through the third energy storage device C3 and the first diode D1, returns to the second rectification input end 202, and the third energy storage device C3 is in a charging state;
therefore, during one cycle of the ac power signal, the second energy storage device C2 and the third energy storage device C3 are charged, accordingly, the ninth selection terminal 3103 is selected by the second switching module S4, and the power circuit can finally output the dc power signal with a voltage value of 2 Vm.
And a third working mode:
when the rotation speed of the motor is greater than the second threshold value, in the first positive half period of the alternating current signal, the MCU controls the first switching device S1 to select the second selection terminal 2503 and the second switching device S2 to select the fourth selection terminal 2603, the alternating current signal is firstly input to the first rectification input terminal 201 and the second rectification input terminal 202, the current flows from the second rectification input terminal 202, passes through the second diode D2, the first switching device S1, the second energy storage device C2 and the second switching device S2 in sequence, and returns to the first rectification input terminal 201, and the second energy storage device C2 is in a charging state;
in the first negative half period of the alternating current signal, the second selection end 2503 is selected by the first switching device S1, the fourth selection end 2603 is selected by the second switching device S2, the current flows from the first rectification input end 201, sequentially passes through the third energy storage device C3 and the first diode D1, and returns to the second rectification input end 202, and the third energy storage device C3 is in a charging state;
in the second positive half period of the alternating current signal, the MCU controls the first switching device S1 to select the first selection terminal 2502, the second switching device S2 to select the third selection terminal 2602, the current flows from the second rectification input terminal 202, and then returns to the first rectification input terminal 201 after passing through the second diode D2, the first switching device S1, the first energy storage device C1 and the second switching device S2 in sequence, and the first energy storage device C1 is in a charging state;
in the second negative half period of the alternating current signal, the MCU controls the first switching device S1 to select the second selection terminal 2503 and the second switching device S2 to select the fourth selection terminal 2603, so that the current flows from the first rectification input terminal 201, passes through the third energy storage device C3 and the first diode D1 in sequence, and returns to the second rectification input terminal 202, and the third energy storage device C3 is in a charging state;
therefore, in two cycles of the ac power signal, the first energy storage device C1, the second energy storage device C2, and the third energy storage device C3 are all charged, accordingly, the eighth selection terminal 3102 is selected by the second switch module S4, and the power circuit can finally output the dc power signal with a voltage value of 3 Vm.
In a possible implementation manner, referring to fig. 5, the voltage regulation module 103 may also include a first energy storage device C1, a second energy storage device C2, a third energy storage device C3, and a fourth energy storage device C4, where the first energy storage device C1, the second energy storage device C2, the third energy storage device C3, and the fourth energy storage device C4 are connected in series;
the first switching module 102 includes a first switching device S1, a second switching device S2, and a third switching device S3, the first switching device S1 includes a first fixed terminal 2501, a first selection terminal 2502, and a second selection terminal 2503, the second switching device S2 includes a second fixed terminal 2601, a third selection terminal 2602, a fourth selection terminal 2603, and a fifth selection terminal 2604, the third switching device S3 includes a third fixed terminal 5101, a sixth selection terminal 5102, and a seventh selection terminal 5013;
the first fixed end 2501 is connected with the first rectifying output end 203, the first selection end 2502 is connected with one end of the first energy storage device C1, and the second selection end 2503 is connected with the other end of the first energy storage device C1;
the second fixed end 2601 is connected to the first rectifying input end 201;
the third selection terminal 2602 is connected to one end of the second energy storage device C2, and the fourth selection terminal 2603 is connected to the other end of the second energy storage device C2;
the fourth selection terminal 2603 is connected with one end of the third energy storage device C3, and the fifth selection terminal 2604 is connected with the other end of the third energy storage device C3;
the fifth selection terminal 2604 is connected to the sixth selection terminal 5102, and the third fixed terminal 5101 is connected to the second rectification output terminal 204;
the sixth select terminal 5102 is coupled to one end of the fourth energy storage device C4 and the seventh select terminal 5013 is coupled to the other end of the fourth energy storage device C4.
When the first switch device S1 selects the first selection terminal 2502, the first fixing terminal 2501 is electrically connected to the first selection terminal 2502, and when the second selection terminal 2503 is selected by the first switch device S1, the first fixing terminal 2501 is electrically connected to the second selection terminal 2503; when the second switching device S2 selects the third selection terminal 2602, the second fixed terminal 2601 is conducted with the third selection terminal 2602, when the fourth selection terminal 2603 is selected by the second switching device S2, the second fixed terminal 2601 is conducted with the fourth selection terminal 2603, and when the fifth selection terminal 2604 is selected by the second switching device S2, the second fixed terminal 2601 is conducted with the fifth selection terminal 2604; when the sixth selection terminal 5102 is selected by the third switching device S3, the third fixed terminal 5101 and the sixth selection terminal 5102 are conducted, and when the seventh selection terminal 5013 is selected by the third switching device S3, the third fixed terminal 5101 and the seventh selection terminal 5013 are conducted. The first switching device S1 may be a single-pole double-throw switch, the second switching device S2 may be a single-pole triple-throw switch, and the third switching device S3 may be a single-pole double-throw switch, or in an embodiment thereof, a switching circuit with another function type may also be used for implementation, which is not limited in the embodiment of the present invention.
Therefore, different multiples of voltage regulation effects can be achieved through the control of the first switching device S1, the second switching device S2 and the third switching device S3, wherein the control of the first switching device S1, the second switching device S2 and the third switching device S3 can be achieved through an MCU (not shown in the figure). The voltage regulation principle of the embodiment of the present invention is explained in detail below, and assuming that the rectified voltage value of the input ac signal is Vm, there are four voltage regulation cases:
firstly, when the first switching device S1 selects the second selection terminal 2503, the second switching device S2 keeps off, and the third switching device S3 selects the sixth selection terminal 5102, the first energy storage device C1 does not work, the second energy storage device C2 and the third energy storage device C3 are connected in series to form a filter capacitor, and finally the voltage regulation module 103 can output a dc signal with a voltage value Vm;
secondly, in the positive half cycle of the ac power signal, when the first switching device S1 selects the second selection terminal 2503, the second switching device S2 selects the fourth selection terminal 2603, the third switching device S3 selects the sixth selection terminal 5102, the second energy storage device C2 is in the charging state, in the negative half cycle of the ac power signal, the third energy storage device C3 is in the charging state while the first switching device S1 selects the second selection terminal 2503, the second switching device S2 selects the fourth selection terminal 2603, and the third switching device S3 selects the sixth selection terminal 5102, and finally the voltage regulating module 103 can output the dc power signal with the voltage value of 2 Vm;
third, in the first positive half cycle of the ac signal, the second energy storage device C2 is in a charged state when the second select terminal 2503 is selected by the first switching device S1, the fourth select terminal 2603 is selected by the second switching device S2, and the sixth select terminal 5102 is selected by the third switching device S3;
during the first negative half cycle of the ac power signal, keeping the third energy storage device C3 in a charged state while the second selection terminal 2503 is selected by the first switching device S1, the fourth selection terminal 2603 is selected by the second switching device S2, and the sixth selection terminal 5102 is selected by the third switching device S3;
next, in a second positive half cycle of the ac power signal, when the first selection terminal 2502 is selected by the first switching device S1, the third selection terminal 2602 is selected by the second switching device S2, and the sixth selection terminal 5102 is selected by the third switching device S3, the first energy storage device C1 is in a charging state;
in the first negative half cycle of the ac power signal, when the second selection terminal 2503 is selected by the first switching device S1, the fourth selection terminal 2603 is selected by the second switching device S2, and the sixth selection terminal 5102 is selected by the third switching device S3, the third energy storage device C3 is in a charging state, and the final voltage regulating module 103 may output a dc power signal with a voltage value of 3 Vm.
Fourth, during the first positive half-cycle of the ac signal, the second energy storage device C2 is in a charged state when the second select terminal 2503 is selected by the first switching device S1, the fourth select terminal 2603 is selected by the second switching device S2, and the sixth select terminal 5102 is selected by the third switching device S3;
during the first negative half cycle of the ac power signal, keeping the third energy storage device C3 in a charged state while the second selection terminal 2503 is selected by the first switching device S1, the fourth selection terminal 2603 is selected by the second switching device S2, and the sixth selection terminal 5102 is selected by the third switching device S3;
next, in a second positive half cycle of the ac power signal, when the first selection terminal 2502 is selected by the first switching device S1, the third selection terminal 2602 is selected by the second switching device S2, and the sixth selection terminal 5102 is selected by the third switching device S3, the first energy storage device C1 is in a charging state;
in the first negative half cycle of the ac power signal, when the second selection terminal 2503 is selected by the first switching device S1, the fourth selection terminal 2603 is selected by the second switching device S2, and the seventh selection terminal 5013 is selected by the third switching device S3, the fourth energy storage device C4 is in a charged state, and the final voltage regulating module 103 may output a dc power signal having a voltage value of 4 Vm.
Therefore, the voltage regulation module 103 in the above embodiment can output four voltage values of different multiples, thereby improving the voltage regulation range of the power circuit and meeting the voltage regulation requirements of various different working conditions.
Accordingly, referring to fig. 6, in one possible implementation, the regulated outputs include a first regulated output 2701, a second regulated output 2702, a third regulated output 2703, and a fourth regulated output 5201;
the first regulation output end 2701 is connected with one end of a first energy storage device C1, the second regulation output end 2702 is connected with the other end of a first energy storage device C1, the third regulation output end 2703 is connected with one end of a fourth energy storage device C4, and the fourth regulation output end 5201 is connected with the other end of a fourth energy storage device C4;
the output switching module 104 is used for switching the first adjustment output 2701, the second adjustment output 2702 and the third adjustment output 2703 according to the action conditions of the first switching device S1 and the second switching device S2.
The output switching module 104 includes a second switching module S4 and a third switching module S5, the second switching module S4 includes a fourth fixed terminal 3101, an eighth selection terminal 3102 and a ninth selection terminal 3103, the eighth selection terminal 3102 is connected to the first adjustment output terminal 2701, and the ninth selection terminal 3103 is connected to the second adjustment output terminal 2702; the third switch module S5 includes a fifth fixed terminal 6101, a tenth selecting terminal 6102 and an eleventh selecting terminal 6103, the tenth selecting terminal 6102 is connected to the third adjusting output terminal 2703, and the eleventh selecting terminal 6103 is connected to the fourth adjusting output terminal 5201.
When the second switch module S4 selects the eighth selection terminal 3102, that is, the fourth fixing terminal 3101 and the eighth selection terminal 3102 are conducted, the third switch module S5 selects the tenth selection terminal 6102, that is, the fifth fixing terminal 6101 and the tenth selection terminal 6102 are conducted, and at this time, the voltage value output by the power circuit is the voltage value between the first regulation output terminal 2701 and the third regulation output terminal 2703; when the second switch module S4 selects the eighth selection terminal 3102, i.e. the fourth fixed terminal 3101 and the eighth selection terminal 3102 are conducted, the third switch module S5 selects the eleventh selection terminal 6103, i.e. the fifth fixed terminal 6101 and the eleventh selection terminal 6103 are conducted, and at this time, the voltage value output by the power circuit is the voltage value between the first regulation output terminal 2701 and the fourth regulation output terminal 5201; when the ninth selection terminal 3103 is selected by the second switching module S4, i.e. the fourth fixing terminal 3101 and the ninth selection terminal 3103 are conducted, the tenth selection terminal 6102 is selected by the third switching module S5, i.e. the fifth fixing terminal 6101 and the tenth selection terminal 6102 are conducted, and at this time, the voltage value output by the power circuit is the voltage value between the second regulation output terminal 2702 and the third regulation output terminal 2703; when the ninth selection terminal 3103 is selected by the second switch module S4, i.e. the fourth fixed terminal 3101 and the ninth selection terminal 3103 are conducted, and the eleventh selection terminal 6103 is selected by the third switch module S5, i.e. the fifth fixed terminal 6101 and the eleventh selection terminal 6103 are conducted, at this time, the voltage value output by the power circuit is the voltage value between the second regulation output terminal 2702 and the fourth regulation output terminal 5201, thereby realizing the switching process of the regulation output terminals. The power output terminal includes a first power output terminal 3201 and a second power output terminal 3202, and the fifth fixing terminal 6101 is connected to the second power output terminal 3202.
It is understood that the second and third switch modules S4 and S5 may be single pole double throw switches, and the control of the second and third switch modules S4 and S5 may be implemented by an MCU.
In addition, referring to fig. 7, in one possible implementation, the second switching module S4 includes a first switching tube Q1, a second switching tube Q2, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4;
the first regulation output end 2701, the first resistor R1, the second resistor R2 and the second regulation output end 2702 are connected in series in sequence, the first switch tube Q1 comprises a first control end 4101, a first action end 4102 and a second action end 4103, and the second switch tube Q2 comprises a second control end 4201, a third action end 4202 and a fourth action end 4203;
the eighth selection terminal 3102 is a first operation terminal 4102, the ninth selection terminal 3103 is a third operation terminal 4202, the first control terminal 4101 and the second control terminal 4201 are connected between a first resistor R1 and a second resistor R2, the third resistor R3 is connected to the first control terminal 4101 and the second operation terminal 4103, respectively, and the fourth resistor R4 is connected to the fourth operation terminal 4203 and the second operation terminal 4103, respectively.
The second operating end 4103 is a fourth fixed end 3101. Illustratively, the first switching tube Q1 may be a PNP transistor, the second switching tube Q2 may be a PNP fet, the base of the first switching tube Q1 is the first control terminal 4101, the emitter of the first switching tube Q1 is the first action terminal 4102, the collector of the first switching tube Q1 is the second action terminal 4103, the gate of the second switching tube Q2 is the second control terminal 4201, the source of the second switching tube Q2 is the third action terminal 4202, the drain of the second switching tube Q2 is the fourth action terminal 4203, when the first regulation output terminal 2701 has no voltage output (i.e. the first energy storage device C1 is not charged), and the second regulation output terminal 2702 and the third regulation output terminal 2703 have voltage outputs, the first switching tube Q1 is in an off state, and under the voltage division effect of the second resistor R2 and the third resistor R3, the gate of the second switching tube Q2 is lower than the source of the second switching tube Q2, so that the voltage of the second switching tube Q38 2 is lower than the source of the second switching tube Q2, the effect of the ninth selection terminal 3103 being selected by the second switch module S4 is achieved; when the first regulation output 2701 has a voltage output (i.e. the first energy storage device C1 is charged), under the voltage division effect of the first resistor R1 and the second resistor R2, the voltage at the base of the first switch Q1 is lower than the voltage at the emitter of the first switch Q1, so that current can flow from the emitter of the first switch Q1 to the base of the first switch Q1, thereby turning on the first switch Q1, and the voltage at the gate of the second switch Q2 is higher than the voltage at the source of the second switch Q2, thereby turning off the second switch Q2. Therefore, the second switch module S4 can automatically switch the regulation output end according to the output condition of the voltage regulation module 103, which is beneficial to reducing the occupation of the control resources of the MCU and improving the working efficiency of the power circuit. In addition, by arranging the fourth resistor R4, a voltage difference exists between the voltage of the second regulation output terminal 2702 and the first power output terminal 3201, so that a stable voltage drop exists between two ends of the second resistor R2, a voltage division effect is ensured, and the stability of actions of the first switch tube Q1 and the second switch tube Q2 is improved.
Referring to fig. 7, the third switching module S5 includes a third switching tube Q3, a fourth switching tube Q4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8;
the third regulation output end 2703, the fifth resistor R5, the sixth resistor R6 and the fourth regulation output end 5201 are connected in series in sequence;
the third switch tube Q3 comprises a third control end 7101, a fifth action end 7102 and a sixth action end 7103, and the fourth switch tube Q4 comprises a fourth control end 7201, a seventh action end 7202 and an eighth action end 7203;
the tenth selection node 6102 is the fifth action node 7102 of FIG. 7;
the eleventh selecting end 6103 is the seventh actuating end 7202 of FIG. 7;
the third control terminal 7101 is connected between the fifth resistor R5 and the sixth resistor R6;
the fourth control terminal 7201 is connected between the fifth resistor R5 and the sixth resistor R6;
the seventh resistor R7 is connected to the sixth active terminal 7103 and the eighth active terminal 7203, respectively, and the eighth resistor R8 is connected to the third control terminal 7101 and the eighth active terminal 7203, respectively. The sixth actuating end 7103 is a fifth fixing end 6101.
Illustratively, the third switching tube Q3 may be an NPN type field effect transistor, the fourth switching tube Q4 may be an NPN type triode, the gate of the third switching tube Q3 is a third control terminal 7101, the source of the third switching tube Q3 is a fifth action terminal 7102, the drain of the third switching tube Q3 is a sixth action terminal 7103, the base of the fourth switching tube Q4 is a fourth control terminal 7201, the emitter of the fourth switching tube Q4 is a seventh action terminal 7202, and the collector of the fourth switching tube Q4 is an eighth action terminal 7203.
When the fourth energy storage device C4 is not charged, there is a voltage difference between the second power output 3202 and the third regulation output 2703 because the fifth fixed terminal 6101 is connected to the second power output 3202;
under the partial pressure action of the fifth resistor R5 and the eighth resistor R8, the voltage at the gate of the third switching tube Q3 is higher than the voltage at the source of the third switching tube Q3 (the current flows from the second power output port 3202 to the third regulation output port 2703), so that the third switching tube Q3 is turned on;
the fourth adjustment output end 5201 has no voltage output, and there is no voltage drop across the sixth resistor R6, so that the fourth switch tube Q4 is turned off, and an effect of selecting the tenth selection end 6102 by the third switch module S5 is achieved;
when the fourth energy storage device C4 is charged, current flows through the fifth resistor R5 and the sixth resistor R6, and under the voltage division effect of the fifth resistor R5 and the sixth resistor R6, the voltage of the gate of the third switching tube Q3 is lower than the voltage of the source of the third switching tube Q3, so that the third switching tube Q3 is turned off;
the voltage of the base of the fourth switching transistor Q4 is higher than the voltage of the emitter of the fourth switching transistor Q4, so that current can flow from the base of the fourth switching transistor Q4 to the emitter of the fourth switching transistor Q4, so that the fourth switching transistor Q4 is turned on, and the effect of selecting the eleventh selection terminal 6103 by the third switching module S5 is achieved.
Therefore, the third switching module S5 can automatically switch the regulation output terminal according to the output condition of the voltage regulation module 103, which is beneficial to reducing the occupation of the control resource of the MCU and improving the working efficiency of the power circuit. In addition, by arranging the seventh resistor R7, a voltage difference exists between the voltage of the third regulation output terminal 2703 and the second power output terminal 3202, so that a stable voltage drop exists between two ends of the fifth resistor R5, a voltage division effect is ensured, and the stability of actions of the third switching tube Q3 and the fourth switching tube Q4 is improved.
In addition, referring to fig. 7, the third switching module S5 may further include a sixth diode D6, and the sixth diode D6 may function to prevent current from flowing back and may function to drop the voltage from the third regulation output 2703 to the second power output 3202, so as to improve the stability of the actions of the third switching tube Q3 and the fourth switching tube Q4.
The operation principle of the power supply circuit will be described below by taking a motor as an example of a load of the power supply circuit.
The power supply circuit composed of the voltage regulation module 103 and the output selection module shown in fig. 5 and 6 has four operation modes, and can switch between the four operation modes according to the rotation speed of the motor, and assuming that the rectified voltage value of the input alternating current signal is Vm, specifically:
the first working mode is as follows:
when the rotating speed of the motor is less than the first threshold value, the MCU controls the first switching device S1 to select the second selection terminal 2503, the second switching device S2 to be kept off, and the third switching device S3 to select the sixth selection terminal 5102, so that the ac signal is firstly input to the first rectification input terminal 201 and the second rectification input terminal 202, and in the positive half cycle of the ac signal, the current flows from the second rectification input terminal 202, sequentially passes through the second diode D2, the first switching device S1, the second energy storage device C2, the third energy storage device C3, the third switching device S3, the fourth diode D4, and returns to the first rectification input terminal 201;
in the negative half period of the alternating current signal, current flows from the first rectification input terminal 201, sequentially passes through the third diode D3, the first switching device S1, the second energy storage device C2, the third energy storage device C3, the third switching device S3 and the first diode D1, and returns to the second rectification input terminal 202;
therefore, in one cycle of the alternating current signal, the first energy storage device C1 and the fourth energy storage device C4 do not work, the second energy storage device C2 and the third energy storage device C3 are connected in series to form a filter capacitor, accordingly, the ninth selection terminal 3103 is selected by the second switching module S4, the tenth selection terminal 6102 is selected by the third switching module S5, and the power supply circuit can finally output the direct current signal with the voltage value Vm.
And a second working mode:
when the rotating speed of the motor is greater than the first threshold and less than the second threshold, the MCU controls the first switching device S1 to select the second selection terminal 2503, the second switching device S2 to select the fourth selection terminal 2603, and the third switching device S3 to select the sixth selection terminal 5102, the ac signal is firstly input to the first rectification input terminal 201 and the second rectification input terminal 202, and in the positive half cycle of the ac signal, the current flows from the second rectification input terminal 202, passes through the second diode D2, the first switching device S1, the second energy storage device C2, and the second switching device S2 in sequence, and returns to the first rectification input terminal 201, and the second energy storage device C2 is in a charging state;
in the negative half period of the alternating current signal, current flows from the first rectification input end 201, sequentially passes through the third energy storage device C3, the third switching device S3 and the first diode D1, returns to the second rectification input end 202, and the third energy storage device C3 is in a charging state;
therefore, in one cycle of the ac power signal, the second energy storage device C2 and the third energy storage device C3 are charged, accordingly, the ninth selection terminal 3103 is selected by the second switching module S4, the tenth selection terminal 6102 is selected by the third switching module S5, and the power circuit can finally output the dc power signal with the voltage value of 2 Vm.
And a third working mode:
when the rotation speed of the motor is greater than the second threshold and less than the third threshold, in the first positive half cycle of the alternating current signal, the MCU controls the first switching device S1 to select the second selection terminal 2503, the second switching device S2 to select the fourth selection terminal 2603, and the third switching device S3 to select the sixth selection terminal 5102, the alternating current signal is firstly input to the first rectification input terminal 201 and the second rectification input terminal 202, the current flows from the second rectification input terminal 202, passes through the second diode D2, the first switching device S1, the second energy storage device C2, and the second switching device S2 in sequence, and returns to the first rectification input terminal 201, and the second energy storage device C2 is in a charging state;
in the first negative half cycle of the alternating current signal, the second selection end 2503 selected by the first switching device S1, the fourth selection end 2603 selected by the second switching device S2 and the sixth selection end 5102 selected by the third switching device S3 are kept, current flows into the first rectification input end 201, sequentially passes through the third energy storage device C3, the third switching device S3 and the first diode D1, returns to the second rectification input end 202, and the third energy storage device C3 is in a charging state;
in the second positive half period of the alternating current signal, the MCU controls the first switching device S1 to select the first selection terminal 2502, the second switching device S2 to select the third selection terminal 2602, and the third switching device S3 to select the sixth selection terminal 5102, so that the current flows from the second rectification input terminal 202, passes through the second diode D2, the first switching device S1, the first energy storage device C1, and the second switching device S2 in sequence, and returns to the first rectification input terminal 201, and the first energy storage device C1 is in a charging state;
in the second negative half period of the alternating current signal, the MCU controls the first switching device S1 to select the second selection terminal 2503, the second switching device S2 to select the fourth selection terminal 2603, and the third switching device S3 to select the sixth selection terminal 5102, so that the current flows from the first rectification input terminal 201, sequentially passes through the third energy storage device C3, the third switching device S3 and the first diode D1, returns to the second rectification input terminal 202, and the third energy storage device C3 is in a charging state;
therefore, in two cycles of the ac power signal, the first energy storage device C1, the second energy storage device C2 and the third energy storage device C3 are all charged, accordingly, the eighth selection terminal 3102 is selected by the second switching module S4, the tenth selection terminal 6102 is selected by the third switching module S5, and the power circuit can finally output the dc power signal with the voltage value of 3 Vm.
It can be understood that the scheme of outputting the 3Vm dc electrical signal is implemented by using the first energy storage device C1, the second energy storage device C2, and the third energy storage device C3, and in other embodiments, the scheme may also be implemented by using the second energy storage device C2, the third energy storage device C3, and the fourth energy storage device C4, and the control of the first switching device S1, the second switching device S2, and the third switching device S3 may be adjusted similarly, which is not described herein again.
And a fourth working mode:
when the rotation speed of the motor is greater than a third threshold value, in a first positive half period of an alternating current signal, the MCU controls the first switching device S1 to select the second selection terminal 2503, the second switching device S2 to select the fourth selection terminal 2603 and the third switching device S3 to select the sixth selection terminal 5102, the alternating current signal is firstly input to the first rectification input terminal 201 and the second rectification input terminal 202, current flows in from the second rectification input terminal 202, sequentially passes through the second diode D2, the first switching device S1, the second energy storage device C2 and the second switching device S2, returns to the first rectification input terminal 201, and the second energy storage device C2 is in a charging state;
in the first negative half cycle of the alternating current signal, the second selection end 2503 selected by the first switching device S1, the fourth selection end 2603 selected by the second switching device S2 and the sixth selection end 5102 selected by the third switching device S3 are kept, current flows into the first rectification input end 201, sequentially passes through the third energy storage device C3, the third switching device S3 and the first diode D1, returns to the second rectification input end 202, and the third energy storage device C3 is in a charging state;
in the second positive half period of the alternating current signal, the MCU controls the first switching device S1 to select the first selection terminal 2502, the second switching device S2 to select the third selection terminal 2602, and the third switching device S3 to select the sixth selection terminal 5102, so that the current flows from the second rectification input terminal 202, passes through the second diode D2, the first switching device S1, the first energy storage device C1, and the second switching device S2 in sequence, and returns to the first rectification input terminal 201, and the first energy storage device C1 is in a charging state;
in the second negative half period of the alternating current signal, the MCU controls the first switching device S1 to select the second selection terminal 2503, the second switching device S2 to select the fifth selection terminal 2604, and the third switching device S3 to select the seventh selection terminal 5013, so that the current flows from the first rectification input terminal 201, sequentially passes through the second switching device S2, the fourth energy storage device C4, the third switching device S3, and the first diode D1, and returns to the second rectification input terminal 202, and the fourth energy storage device C4 is in a charging state;
therefore, in two cycles of the ac power signal, the first energy storage device C1, the second energy storage device C2, the third energy storage device C3 and the fourth energy storage device C4 are all charged, accordingly, the eighth selection terminal 3102 is selected by the second switching module S4, the eleventh selection terminal 6103 is selected by the third switching module S5, and the power circuit can finally output the dc power signal with the voltage value of 4 Vm.
It is understood that the first threshold, the second threshold, and the third threshold of the motor rotation speed in the embodiment of the present invention may be set according to actual situations, and the embodiment of the present invention is not limited.
In a possible implementation manner, referring to fig. 3, 4, 6 or 7, a filtering module is further disposed between the first power output port 3201 and the second power output port 3202 for filtering out interference of the electrical signal output by the power circuit, wherein the filtering module may include two electrolytic capacitors C5, C6 connected in parallel with each other.
In addition, the embodiment of the utility model also provides a circuit board which comprises the power circuit in the embodiment. Therefore, the circuit board according to the embodiment of the utility model can output different voltage values, and meet the voltage regulation requirements of various working conditions.
In addition, the embodiment of the utility model also provides an electric appliance which comprises the power circuit in the embodiment. Therefore, the electric appliance provided by the embodiment of the utility model can output different voltage values, and can meet the voltage regulation requirements of various working conditions. It is understood that the electrical appliance may be an air conditioner, a washing machine, a fan, etc., and the embodiments of the present invention are not necessarily examples.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims (12)

1. A power supply circuit, comprising:
the rectification module is used for rectifying the electric signal;
the voltage regulation module is used for carrying out voltage regulation on the electric signal and comprises at least three energy storage devices which are connected in series;
the first switch module is used for adjusting the working state of the energy storage device so as to change the voltage regulation multiple of the voltage regulation module on the electric signal, and the first switch module is respectively connected with the rectification module and the voltage regulation module;
the adjusting output end is connected with the energy storage device;
and the output switching module is used for switching the adjusting output end and is connected with the adjusting output end.
2. The power supply circuit according to claim 1, wherein:
the rectifier module includes the full-bridge rectifier that is formed by four diode connections, the full-bridge rectifier includes first rectification input, first rectification output and second rectification output, first switch module connects respectively first rectification input, first rectification output and second rectification output.
3. The power supply circuit according to claim 2, wherein:
the voltage regulation module comprises a first energy storage device, a second energy storage device and a third energy storage device which are connected in series, the first switch module comprises a first switch device and a second switch device, the first switch device comprises a first fixed end, a first selection end and a second selection end, and the second switch device comprises a second fixed end, a third selection end, a fourth selection end and a fifth selection end;
the first fixed end is connected with the first rectification output end, the first selection end and the second selection end are correspondingly connected with the two ends of the first energy storage device respectively, the second fixed end is connected with the first rectification input end, the third selection end and the fourth selection end are correspondingly connected with the two ends of the second energy storage device respectively, the fourth selection end and the fifth selection end are correspondingly connected with the two ends of the third energy storage device respectively, and the fifth selection end is connected with the second rectification output end.
4. The power supply circuit according to claim 3, wherein:
the adjusting output end comprises a first adjusting output end, a second adjusting output end and a third adjusting output end, the first adjusting output end and the second adjusting output end are respectively and correspondingly connected with two ends of the first energy storage device, and the third adjusting output end is connected with the fifth selecting end;
the output switching module comprises a second switch module, the second switch module comprises an eighth selection end and a ninth selection end, the eighth selection end is connected with the first adjusting output end, and the ninth selection end is connected with the second adjusting output end.
5. The power supply circuit according to claim 4, wherein:
the second switch module comprises a first switch tube, a second switch tube, a first resistor, a second resistor, a third resistor and a fourth resistor, the first adjusting output end is connected with the second adjusting output end in series in sequence, the first switch tube comprises a first control end, a first action end and a second action end, the second switch tube comprises a second control end, a third action end and a fourth action end, the eighth selection end is the first action end, the ninth selection end is the third action end, the first control end is connected with the second control end between the first resistor and the second resistor, the third resistor is connected with the first control end and the second action end respectively, and the fourth resistor is connected with the fourth action end and the second action end respectively.
6. The power supply circuit according to claim 3, wherein:
the voltage regulation module further comprises a fourth energy storage device, and the first energy storage device, the second energy storage device, the third energy storage device and the fourth energy storage device are sequentially connected in series;
the first switch module further comprises a third switch device, the third switch device comprises a third fixed end, a sixth selection end and a seventh selection end, the fifth selection end is connected with the sixth selection end, the third fixed end is connected with the second rectification output end, and the sixth selection end and the seventh selection end are correspondingly connected with two ends of the fourth energy storage device respectively.
7. The power supply circuit of claim 6, wherein:
the adjusting output end comprises a first adjusting output end, a second adjusting output end, a third adjusting output end and a fourth adjusting output end, the first adjusting output end and the second adjusting output end are respectively and correspondingly connected with two ends of the first energy storage device, and the third adjusting output end and the fourth adjusting output end are respectively and correspondingly connected with two ends of the fourth energy storage device;
the output switching module comprises a second switch module and a third switch module, the second switch module comprises an eighth selection end and a ninth selection end, the eighth selection end is connected with the first adjusting output end, and the ninth selection end is connected with the second adjusting output end; the third switching module comprises a tenth selection terminal and an eleventh selection terminal, the tenth selection terminal is connected with the third adjusting output terminal, and the eleventh selection terminal is connected with the fourth adjusting output terminal.
8. The power supply circuit of claim 7, wherein:
the second switch module comprises a first switch tube, a second switch tube, a first resistor, a second resistor, a third resistor and a fourth resistor, the first adjusting output end, the first resistor, the second resistor and the second adjusting output end are sequentially connected in series, the first switch tube comprises a first control end, a first action end and a second action end, the second switch tube comprises a second control end, a third action end and a fourth action end, the eighth selection end is the first action end, the ninth selection end is the third action end, the first control end and the second control end are connected between the first resistor and the second resistor, the third resistor is respectively connected with the first control end and the second action end, and the fourth resistor is respectively connected with the fourth action end and the second action end;
the third switch module comprises a third switch tube, a fourth switch tube, a fifth resistor, a sixth resistor, a seventh resistor and an eighth resistor, the third adjusting output end, the fifth resistor, the sixth resistor and the fourth adjusting output end are sequentially connected in series, the third switch tube comprises a third control end, a fifth action end and a sixth action end, the fourth switch tube comprises a fourth control end, a seventh action end and an eighth action end, the tenth selection end is the fifth action end, the eleventh selection end is the seventh action end, the third control end and the fourth control end are connected between the fifth resistor and the sixth resistor, the seventh resistor is respectively connected between the sixth action end and the eighth action end, and the eighth resistor is respectively connected between the third control end and the eighth action end.
9. The power supply circuit according to claim 1, further comprising:
the power output end is connected with the output switching module;
and the filtering module is connected with the power output end.
10. The power supply circuit according to claim 1, wherein:
the energy storage device is an electrolytic capacitor.
11. A circuit board comprising the power supply circuit of any one of claims 1 to 10.
12. An electrical appliance comprising a power supply circuit as claimed in any one of claims 1 to 10.
CN202121242366.1U 2021-06-03 2021-06-03 Power supply circuit, circuit board and electrical apparatus Active CN215601206U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202121242366.1U CN215601206U (en) 2021-06-03 2021-06-03 Power supply circuit, circuit board and electrical apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202121242366.1U CN215601206U (en) 2021-06-03 2021-06-03 Power supply circuit, circuit board and electrical apparatus

Publications (1)

Publication Number Publication Date
CN215601206U true CN215601206U (en) 2022-01-21

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202121242366.1U Active CN215601206U (en) 2021-06-03 2021-06-03 Power supply circuit, circuit board and electrical apparatus

Country Status (1)

Country Link
CN (1) CN215601206U (en)

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