CN113765382A - Buck-boost working circuit, control method thereof and switching power supply - Google Patents
Buck-boost working circuit, control method thereof and switching power supply Download PDFInfo
- Publication number
- CN113765382A CN113765382A CN202111075079.0A CN202111075079A CN113765382A CN 113765382 A CN113765382 A CN 113765382A CN 202111075079 A CN202111075079 A CN 202111075079A CN 113765382 A CN113765382 A CN 113765382A
- Authority
- CN
- China
- Prior art keywords
- selection switch
- circuit
- switch
- buck
- boost
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000009467 reduction Effects 0.000 claims abstract description 16
- 239000003990 capacitor Substances 0.000 claims description 31
- 230000001276 controlling effect Effects 0.000 claims description 20
- 230000003068 static effect Effects 0.000 claims description 16
- 230000001105 regulatory effect Effects 0.000 claims description 13
- 230000005669 field effect Effects 0.000 claims description 8
- 230000008569 process Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Images
Classifications
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention relates to a buck-boost circuit, and provides a buck-boost working circuit, a control method thereof and a switching power supply. The buck-boost working circuit comprises: the invention can control the working state of the circuit through simple switch control, so that the circuit works in a voltage reduction state or a voltage boosting state without increasing extra loss of the circuit, and the MOS tube, the freewheeling diode and the inductance coil are commonly used, so that the volume of the corresponding power supply device is reduced, and the voltage boosting and reducing state of the power supply can be stably switched under the condition of volume limit.
Description
Technical Field
The invention relates to a buck-boost circuit, in particular to a buck-boost working circuit, a control method thereof and a switching power supply.
Background
A common buck-boost circuit generally includes, in addition to a power supply, a buck MOS transistor Q1 (field effect transistor), a boost MOS transistor Q2, a buck diode D1, a boost diode D2, a freewheeling inductor L1, and a capacitor C1, and as shown in fig. 1, when Q1 is PWM conducting and Q2 is not conducting, the power supply operates in a buck mode; when the Q1 is in a normal on state and the Q2 is PWM on, the power supply works in a boosting state; when Q1 is PWM on and Q2 is PWM on, the power supply operates in an operating state that can be either step up or step down. However, this circuit configuration increases losses during operation: in the boosting mode, the Q1 is usually only used for keeping a circuit path, which is equivalent to the action of a lead, but when current flows, the Q1 is used as a MOS tube, and the loss generated by the internal resistance is inevitable; similarly, in the buck mode, D1 acts as a diode, and conduction loss caused by the voltage drop is inevitable; in addition, in the buck-boost mode, since the freewheeling inductor L1 is commonly used and since the inductance of the freewheeling inductor L1 is fixed, the voltage loop oscillates when the circuit operates on the boost and buck boundaries, and the loss of L1 increases. Therefore, extra loss is added to the buck-boost circuit structure in the prior art in the working state, and low-cost and high-efficiency output cannot be realized.
Disclosure of Invention
The technical problems mainly solved by the embodiment of the invention are as follows: the existing boost-buck circuit structure can increase extra loss in a working state, and cannot realize low-cost and high-efficiency output.
In order to solve the above technical problem, one technical solution adopted by the embodiment of the present invention is: there is provided a buck-boost operating circuit, the circuit comprising: the device comprises an input port, a switch module, a control module and a buck-boost auxiliary module;
the input port is used for receiving an input voltage;
the switch module is used for controlling the working modes of the circuit, wherein the working modes comprise a voltage reduction mode and a voltage boosting mode;
the control module is used for providing a control signal for the voltage boosting and reducing auxiliary module when the working mode is a voltage reducing mode and a voltage increasing mode;
the boost-buck auxiliary module comprises an inductance coil and a capacitor, the inductance coil is connected with the capacitor in series, and the boost-buck auxiliary module is used for converting the input voltage into the output voltage according to the control signal and outputting the output voltage through the capacitor.
Optionally, the boost auxiliary module further includes a diode;
when the circuit works in the voltage reduction mode, the diode is used for enabling the output voltage to be smaller than the input voltage according to the control signal and combining the inductance coil and the capacitor;
when the circuit works in the boosting mode, the diode is used for enabling the output voltage to be larger than the input voltage according to the control signal and combined with the inductance coil and the capacitor.
Optionally, the buck-boost auxiliary module is combined with the input port to form a main power circuit, and the switch module is configured to:
controlling the control module to be connected in series with the main power circuit, and controlling the diode to be connected in parallel with the main power circuit, so that the circuit works in a voltage reduction mode;
and controlling the control module to be connected with the main power circuit in parallel, and connecting the diode with the main power circuit in series so as to enable the circuit to work in a boosting mode.
Optionally, the switch module includes an adjusting switch, a second selecting switch, a third selecting switch, a fourth selecting switch, a fifth selecting switch, and a sixth selecting switch, and the second selecting switch, the third selecting switch, the fourth selecting switch, the fifth selecting switch, and the sixth selecting switch respectively include a moving contact, a first stationary contact, and a second stationary contact, where:
the regulating switch is connected between the anode of the input port and the output end of the control module;
a moving contact of the second selection switch is connected with the negative electrode of the input port, a first static contact of the second selection switch is connected with the input end of the control module, and a second static contact of the second selection switch is connected with the inductance coil;
a moving contact of the third selection switch is connected with one end of the inductance coil, which is far away from the second selection switch, a first static contact of the third selection switch is connected with the output end of the control module, and a second static contact of the third selection switch is connected with the input end of the control module;
a moving contact of the fourth selection switch is connected with the anode of a capacitor, a first fixed contact of the fourth selection switch is connected with one end of the inductance coil, which is close to the second selection switch, and a second fixed contact of the fourth selection switch is connected with the cathode of the diode;
a moving contact of the fifth selection switch is connected with one end of the inductance coil, which is far away from the second selection switch, a first static contact of the fifth selection switch is connected with the cathode of the diode, and a second static contact of the fifth selection switch is connected with a second static contact of the sixth selection switch;
a moving contact of the sixth selection switch is connected with the anode of the diode, a first stationary contact of the sixth selection switch is connected with the cathode of the input port, and a second stationary contact of the sixth selection switch is connected with a second stationary contact of the fifth selection switch.
Optionally, the adjusting switch is a field effect transistor, a source of the field effect transistor is connected to a negative electrode of the input port, and a drain of the field effect transistor is connected to an output end of the control module.
Optionally, the second selection switch, the third selection switch, the fourth selection switch, the fifth selection switch and the sixth selection switch are relays.
Optionally, the control module is a switching tube.
In order to solve the above technical problem, another technical solution adopted by the embodiment of the present invention is: the control method of the buck-boost working circuit is applied to the buck-boost working circuit and comprises the following steps:
the regulating switch is controlled to be switched off, and the second selection switch, the third selection switch, the fourth selection switch, the fifth selection switch and the sixth selection switch are controlled to be connected to the corresponding first static contact points, so that the circuit works in a voltage reduction mode;
and controlling the regulating switch to be conducted, and controlling the second selection switch, the third selection switch, the fourth selection switch, the fifth selection switch and the sixth selection switch to be connected to the corresponding second stationary contacts, so that the circuit works in a boosting mode.
Optionally, the control signal is a pulse width modulation signal, and the method further includes:
and controlling the duty ratio of the pulse width modulation signal to enable the circuit to complete the voltage boosting or voltage reducing of the input voltage.
In order to solve the above technical problem, another technical solution adopted by the embodiment of the present invention is: the switching power supply comprises the buck-boost working circuit.
The invention provides a buck-boost working circuit, a control method thereof and a switching power supply, wherein the circuit comprises an input port, a switching module, a control module and a buck-boost auxiliary module, the working state of the circuit can be controlled through a simple switch to enable the circuit to work in a buck state or a boost state, the extra loss of the circuit cannot be increased, a switching tube, a freewheeling diode and an inductance coil are commonly used, the size of a corresponding power supply device is reduced, and the boost-buck state can be stably switched by the power supply under the condition of volume limit.
Drawings
One or more embodiments are illustrated in drawings corresponding to, and not limiting to, the embodiments, in which elements having the same reference number designation may be represented as similar elements, unless specifically noted, the drawings in the figures are not to scale.
FIG. 1 is a schematic diagram of a typical buck-boost circuit in the prior art;
fig. 2 is a schematic diagram of a buck-boost operating circuit according to an embodiment of the present invention;
FIG. 3 is a simplified circuit diagram of the buck-boost operating circuit operating in the boost mode;
fig. 4 is a simplified circuit diagram of the buck-boost operating circuit operating in the buck mode.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items, the terms "first," "second," and the like are used for distinguishing purposes only and do not denote or imply importance. 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, if not conflicted, the various features of the embodiments of the invention may be combined with each other within the scope of protection of the invention. In addition, although the division of the functional modules is made in the embodiments, in some cases, it may be divided in modules different from those in the embodiments.
An embodiment of the present invention provides a buck-boost operating circuit, please refer to fig. 2, where fig. 2 is a circuit structure example of the buck-boost operating circuit, and the circuit includes: the boost-buck converter comprises an input port, a switch module, a control module and a boost-buck auxiliary module, wherein the input port is used for receiving input voltage, in fig. 2, a direct-current power supply provides the input voltage as an example, the input port receives voltage output by the direct-current power supply as the input voltage, and a negative electrode of the direct-current power supply is grounded. The switch module is used for controlling the working modes of the circuit, wherein the working modes comprise a voltage reduction mode and a voltage boosting mode, the output voltage is lower than the input voltage and is in the voltage reduction mode, and the output voltage is higher than the input voltage and is in the voltage boosting mode. The switch modules are embodied as a regulating switch S1, a second selection switch S2, a third selection switch S3, a fourth selection switch S4, a fifth selection switch S5 and a sixth selection switch S6 in the circuit example of fig. 2, wherein the descriptions of "first", "second" or "third" and the like are only used for distinguishing the plurality of selection switch devices, and are not used for limiting the importance degree or connection relationship of the selection switches and the like. The regulating switch S1 includes an on state and an off state for controlling the on/off of the branch, it is understood that the switch module shown in fig. 2 is only the structure and connection manner in this embodiment, and in other embodiments, the switch module may be a structure and connection manner different from that of fig. 2, which can control the operation mode of the circuit. The control module is configured to provide a control signal to the buck-boost auxiliary module when the operating mode is a buck mode and a boost mode, and the control module is a switching element in this embodiment, for example, a switching tube Q3 in fig. 2. Referring to fig. 2, the buck-boost auxiliary module includes an inductor L3, a capacitor C3, and a diode D3, and is configured to convert the input voltage into an output voltage according to the control signal and output the output voltage through the capacitor C3.
The buck-boost auxiliary module is combined with an input port to form a main power circuit, please refer to the circuit example of fig. 2, the circuit in fig. 2 can change the circuit structure of the circuit by changing the connection selection of each switch in the switch module, so as to control the circuit to operate in a buck mode or a boost mode, when the switch module controls the circuit to operate in the buck mode, the diode D3 is connected in parallel in the main power circuit, the cathode of the diode D3 is connected between the control switch Q3 and the inductor L3, and the anode of the diode D3 is connected to the cathode (ground) of the capacitor C3; when the switch module controls the circuit to work in a boosting mode, the diode D3 is connected in series in the main power circuit, the diode D3 is connected between the inductor L3 and the capacitor C3, the anode of the diode D3 is close to the inductor L3, and the cathode of the diode D3 is close to the capacitor C3.
Specifically, referring to fig. 2, the second selection switch S2, the third selection switch S3, the fourth selection switch S4, the fifth selection switch S5 and the sixth selection switch S6 are all single-pole double-throw switches having a movable contact, a first fixed contact and a second fixed contact, or other switches having the same function as the single-pole double-throw switches, where the first fixed contact and the second fixed contact are only used for distinguishing the circuit configuration of the switch connection and do not represent the relative importance thereof, the movable contacts corresponding to the plurality of selection switches may be selectively connected to the corresponding first fixed contact or selectively connected to the corresponding second fixed contact, in this embodiment, the plurality of selection switches may only have the above two connection states, but other connection states are not limited to the case that the movable contacts corresponding to the selection switches are not necessarily present in other embodiments, for example, the movable contacts corresponding to the first fixed contacts are not connected, nor the state of its corresponding second stationary contact. The plurality of selector switches S2 to S6 may be relays, determine whether the moving contact of each selector switch is connected to the corresponding first stationary contact or the corresponding second stationary contact, and may be high-voltage direct-current relays, and select a proper voltage value according to the use environment to control the state switching of the selector switches, so as to achieve a better switching effect.
In an alternative scheme, taking the circuit structure in fig. 2 as an example, each selector switch in the figure has two selectable connections, which are distinguished by solid lines and dashed lines, respectively, where contacts indicated by dashed lines and black dots as connections represent first stationary contact connections corresponding to the second selector switch S2, the third selector switch S3, the fourth selector switch S4, the fifth selector switch S5, and the sixth selector switch S6, respectively. The specific connection relationship is as follows: the moving contact of the second selection switch S2 is connected to the negative terminal of the input port, which refers to the negative terminal of the dc power supply in fig. 2 or the ground, the first stationary contact of the second selection switch S2 is connected to the input terminal of the control switch Q3, and the second stationary contact of the second selection switch S2 is connected to the inductor L3; a moving contact of the third selection switch S3 is connected to one end of the inductor L3 far from the second selection switch S2, a first stationary contact of the third selection switch S3 is connected to an output end of a control switch Q3, and a second stationary contact of the third selection switch S3 is connected to an input end of a control switch Q3; a moving contact of the fourth selection switch S4 is connected to an anode of a capacitor C3, a first stationary contact of the fourth selection switch S4 is connected to one end of the inductor L3 close to the second selection switch S2, and a second stationary contact of the fourth selection switch S4 is connected to a cathode of the diode D3; a moving contact of the fifth selection switch S5 is connected to one end of the inductor L3 far from the second selection switch S2, a first stationary contact of the fifth selection switch S5 is connected to the cathode of the diode D3, and a second stationary contact of the fifth selection switch S5 is connected to a second stationary contact of the sixth selection switch S6; a moving contact of the sixth selection switch S6 is connected to the anode of the diode D3, a first stationary contact of the sixth selection switch S6 is connected to the cathode of the input port, which means the cathode of the dc power supply in fig. 2 or the ground, and a second stationary contact of the sixth selection switch S6 is connected to the second stationary contact of the fifth selection switch S5.
Alternatively, the adjusting switch S1 may be a device with a switching function, including but not limited to a selection switch, a relay, or a selection field effect transistor (MOS transistor), and the like, where the MOS transistor has smaller loss and is more convenient to control than the relay and the like.
The control signal is used for controlling the on and off of the switch tube Q3, when the second selection switch S2, the third selection switch S3, the fourth selection switch S4, the fifth selection switch S5 and the sixth selection switch S6 are all connected to the corresponding first stationary contacts, the adjustment switch S1 is turned off, and then the circuit operates in a step-down mode, the corresponding simplified circuit diagram is shown in fig. 3, and the switch module and the lead part which is not accessed to the circuit are omitted in fig. 3 for convenience of understanding the circuit structure and enabling more intuitive description. The switching tube Q3 is connected in series in the main power circuit, the step-down cycle comprises a first time period when the switching tube Q3 is conducted and a second time period when the switching tube Q3 is disconnected, and when the switching tube Q3 is conducted, the direct-current power supply provides input voltage to the input port to charge the inductance coil L3 and the capacitor C3; when the switching tube Q3 is turned off, the current flowing through the inductor L3 disappears, and the inductor L3 generates induced electromotive force, at this time, the diode D3 has a freewheeling function, the inductor L3 continuously provides freewheeling energy for the capacitor C3 through the diode D3, a voltage reduction cycle is completed, when the switching tube Q3 is turned on again, the next voltage reduction cycle starts, and the above process is repeated, so that the capacitor C3 can output a relatively stable output voltage, which is smaller than the input voltage received by the input port.
When the second selection switch S2, the third selection switch S3, the fourth selection switch S4, the fifth selection switch S5 and the sixth selection switch S6 are all connected to the corresponding second stationary contact, the adjustment switch S1 is turned on, and the circuit operates in the boost mode at this time, and the corresponding simplified circuit diagram is shown in fig. 4. The switching tube Q3 is connected in parallel in the main power circuit, the boost cycle includes the third time interval when the switching tube Q3 is conducted and the fourth time interval when the switching tube Q3 is disconnected, when the switching tube Q3 is conducted, the direct current power supply provides input voltage to the input port to charge the inductance coil L3, and the current returns to the negative pole of the direct current power supply through the branch of the switching tube Q3 after flowing through the inductance coil; when the switch Q3 is turned off, the current flowing through the inductor L3 disappears, but the voltage of the inductor L3 does not change suddenly, at this time, the diode D3 is turned on to have a boosting effect, the inductor L3 charges the capacitor C3 via the diode D3, a boosting cycle is completed, when the switch Q3 is turned on again, the next boosting cycle begins, and the above-mentioned process is repeated, so that the capacitor C3 can output a relatively stable output voltage, which is greater than the input voltage received by the input port.
Compared with the buck-boost circuit in the prior art, taking fig. 1 as an example, when the circuit in fig. 1 operates in the boost mode, the MOS transistor Q1 acts as a conducting wire in the circuit, but its internal resistance still generates loss; when the circuit operates in the buck mode, the voltage drop of the diode D1 itself also generates conduction loss and the like. The buck-boost working circuit provided by the embodiment does not have extra loss caused by extra internal resistance of elements in the boost process or the buck process, and only needs to change the connection state of each switch in the switch module when the buck-boost working circuit is switched, the circuit shares the switch tube Q3, the diode D3 and the inductance coil L3 in the boost mode and the buck mode, and does not need to additionally add elements or extra loss of the circuit. In addition, during the actual design, the conducting state of the regulating switch S1 can be associated with the contact connection state of the selector switches S2 to S6, so that the user can directly change the operating state of the circuit only by controlling the regulating switch S1 during the use, and the use is more convenient.
The embodiment of the invention provides a control method of a buck-boost working circuit, which is applied to the buck-boost working circuit and comprises the following steps:
the regulating switch S1 is controlled to be turned off, and the second selection switch S2, the third selection switch S3, the fourth selection switch S4, the fifth selection switch S5 and the sixth selection switch S6 are controlled to be connected to the corresponding first stationary contacts, namely, the contacts connected are indicated by dotted lines and black dots in fig. 2, so that the circuit operates in the step-down mode. Referring to fig. 2 and 3, the switch Q3 is connected in series in the main power circuit, and the diode D3 is connected in parallel with the inductor L3 and the capacitor C3.
The regulating switch S1 is controlled to be turned on, and the second selection switch S2, the third selection switch S3, the fourth selection switch S4, the fifth selection switch S5 and the sixth selection switch S6 are controlled to be connected to the corresponding second stationary contact, namely, each contact connected as indicated by a solid line in fig. 2, so that the circuit operates in the boost mode. Referring to fig. 2 and 4, the switching tube Q3 is connected in parallel to the main power circuit, and forms a complete loop with the inductor L3 and the dc power supply, and the diode D3 is connected in series with the capacitor C3, so that the inductor L3 can charge the capacitor C3 through the diode D3.
Optionally, the control signal is a pulse width modulation signal, and the method further includes: and controlling the duty ratio of the pulse width modulation signal to enable the circuit to complete the voltage boosting or voltage reducing of the input voltage, and changing the duty ratio can change the output voltage. The control signal is used for controlling the on-off of the switch tube Q3, in the voltage reduction mode of the circuit, when the switch tube Q3 is disconnected, the current flowing through the inductance coil L3 disappears, because the inductance coil L3 can generate induced electromotive force, the diode D3 has the function of continuous flow at the moment, the inductance coil L3 continuously provides continuous flow energy for the capacitor C3 through the diode D3, a voltage reduction period is completed, when the switch tube Q3 is conducted again, the next voltage reduction period starts, the process is repeated, so that the capacitor C3 can output relatively stable output voltage, and the output voltage is smaller than the input voltage received by the input port. In the boost mode of the circuit, when the switching tube Q3 is turned on, the dc power supply provides input voltage to the input port to charge the inductor L3, and the current flows through the inductor and then returns to the negative electrode of the dc power supply through the branch of the switching tube Q3; when the switch Q3 is turned off, the current flowing through the inductor L3 disappears, but the voltage of the inductor L3 does not change suddenly, at this time, the diode D3 is turned on to have a boosting effect, the inductor L3 charges the capacitor C3 via the diode D3, a boosting cycle is completed, when the switch Q3 is turned on again, the next boosting cycle begins, and the above-mentioned process is repeated, so that the capacitor C3 can output a relatively stable output voltage, which is greater than the input voltage received by the input port.
The embodiment of the present invention provides a switching power supply, wherein the buck-boost working circuit of the switching power supply is adapted to the buck-boost working circuit control method, and for details of the buck-boost switching process, reference is made to the above embodiment, which is not repeated herein. It can be understood that the circuit structure of the buck-boost working circuit is not limited to be used in a buck-boost switching circuit, and the forward circuits similar to the buck-boost working circuit are all applicable to the circuit structure, for example, the buck-boost working circuit can also be applied to switching between a single-tube forward circuit and a double-tube forward circuit, and can achieve better working effects including but not limited to reducing loop loss, reducing the volume limit of the switching power supply, or improving the buck-boost switching stability of the switching power supply by combining the circuit structure of the buck-boost working circuit and the corresponding control method.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A buck-boost operating circuit, the circuit comprising: the device comprises an input port, a switch module, a control module and a buck-boost auxiliary module;
the input port is used for receiving an input voltage;
the switch module is used for controlling the working modes of the circuit, wherein the working modes comprise a voltage reduction mode and a voltage boosting mode;
the control module is used for providing a control signal for the voltage boosting and reducing auxiliary module when the working mode is a voltage reducing mode and a voltage increasing mode;
the boost-buck auxiliary module comprises an inductance coil and a capacitor, the inductance coil is connected with the capacitor in series, and the boost-buck auxiliary module is used for converting the input voltage into the output voltage according to the control signal and outputting the output voltage through the capacitor.
2. The circuit of claim 1, wherein the boost assist module further comprises a diode;
when the circuit works in the voltage reduction mode, the diode is used for enabling the output voltage to be smaller than the input voltage according to the control signal and combining the inductance coil and the capacitor;
when the circuit works in the boosting mode, the diode is used for enabling the output voltage to be larger than the input voltage according to the control signal and combined with the inductance coil and the capacitor.
3. The circuit of claim 2, wherein the buck-boost assist module in combination with the input port form a main power circuit, and wherein the switch module is configured to:
controlling the control module to be connected in series with the main power circuit, and controlling the diode to be connected in parallel with the main power circuit, so that the circuit works in a voltage reduction mode;
and controlling the control module to be connected with the main power circuit in parallel, and connecting the diode with the main power circuit in series so as to enable the circuit to work in a boosting mode.
4. The circuit of claim 2 or 3, wherein the switch module comprises an adjustment switch, a second selection switch, a third selection switch, a fourth selection switch, a fifth selection switch, and a sixth selection switch, the second selection switch, the third selection switch, the fourth selection switch, the fifth selection switch, and the sixth selection switch each comprising a movable contact, a first stationary contact, and a second stationary contact, respectively, wherein:
the regulating switch is connected between the anode of the input port and the output end of the control module;
a moving contact of the second selection switch is connected with the negative electrode of the input port, a first static contact of the second selection switch is connected with the input end of the control module, and a second static contact of the second selection switch is connected with the inductance coil;
a moving contact of the third selection switch is connected with one end of the inductance coil, which is far away from the second selection switch, a first static contact of the third selection switch is connected with the output end of the control module, and a second static contact of the third selection switch is connected with the input end of the control module;
a moving contact of the fourth selection switch is connected with the anode of a capacitor, a first fixed contact of the fourth selection switch is connected with one end of the inductance coil, which is close to the second selection switch, and a second fixed contact of the fourth selection switch is connected with the cathode of the diode;
a moving contact of the fifth selection switch is connected with one end of the inductance coil, which is far away from the second selection switch, a first static contact of the fifth selection switch is connected with the cathode of the diode, and a second static contact of the fifth selection switch is connected with a second static contact of the sixth selection switch;
a moving contact of the sixth selection switch is connected with the anode of the diode, a first stationary contact of the sixth selection switch is connected with the cathode of the input port, and a second stationary contact of the sixth selection switch is connected with a second stationary contact of the fifth selection switch.
5. The circuit of claim 4, wherein the regulating switch is a field effect transistor, a source of the field effect transistor is connected to the negative terminal of the input port, and a drain of the field effect transistor is connected to the output terminal of the control module.
6. The circuit of claim 4, wherein the second selection switch, the third selection switch, the fourth selection switch, the fifth selection switch, and the sixth selection switch are all relays.
7. A circuit according to claim 2 or 3, wherein the control module is a switching tube.
8. A control method of a buck-boost working circuit is applied to the buck-boost working circuit, and comprises the following steps:
the regulating switch is controlled to be switched off, and the second selection switch, the third selection switch, the fourth selection switch, the fifth selection switch and the sixth selection switch are controlled to be connected to the corresponding first static contact points, so that the circuit works in a voltage reduction mode;
and controlling the regulating switch to be conducted, and controlling the second selection switch, the third selection switch, the fourth selection switch, the fifth selection switch and the sixth selection switch to be connected to the corresponding second stationary contacts, so that the circuit works in a boosting mode.
9. The method of claim 8, wherein the control signal is a pulse width modulated signal, the method further comprising:
and controlling the duty ratio of the pulse width modulation signal to enable the circuit to complete the voltage boosting or voltage reducing of the input voltage.
10. A switching power supply, characterized in that it comprises the buck-boost operating circuit according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111075079.0A CN113765382B (en) | 2021-09-14 | 2021-09-14 | Step-up and step-down working circuit, control method thereof and switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111075079.0A CN113765382B (en) | 2021-09-14 | 2021-09-14 | Step-up and step-down working circuit, control method thereof and switching power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113765382A true CN113765382A (en) | 2021-12-07 |
| CN113765382B CN113765382B (en) | 2024-03-15 |
Family
ID=78795492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111075079.0A Active CN113765382B (en) | 2021-09-14 | 2021-09-14 | Step-up and step-down working circuit, control method thereof and switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113765382B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2852463A1 (en) * | 2003-03-11 | 2004-09-17 | Ge Med Sys Global Tech Co Llc | Voltage converter for power factor correction, has selector to configure switching cell in two configurations among three configurations, where cell uses same transistor in all configurations |
| CN102035386A (en) * | 2009-09-29 | 2011-04-27 | 旭隼科技股份有限公司 | Boost/step-down conversion device and operating method thereof |
| CN102761249A (en) * | 2011-04-29 | 2012-10-31 | 芯传科技股份有限公司 | Current Mode DC Converter |
| CN102868311A (en) * | 2012-09-19 | 2013-01-09 | 华为技术有限公司 | Inverter input-stage circuit with wide voltage input range and inverter |
| KR101440277B1 (en) * | 2013-11-21 | 2014-09-17 | 한밭대학교 산학협력단 | Apparatus of Bidirectional DC-to-DC Converter |
| CN110912406A (en) * | 2019-11-19 | 2020-03-24 | 中国船舶重工集团公司第七一九研究所 | Control method of wide-range high-frequency direct current conversion device |
| CN112711286A (en) * | 2019-10-25 | 2021-04-27 | 安徽威灵汽车部件有限公司 | Voltage regulating circuit, voltage regulating control method, voltage regulating device, storage medium and vehicle |
| CN113364284A (en) * | 2021-06-21 | 2021-09-07 | 珠海格力电器股份有限公司 | Voltage boosting and reducing circuit, control method and electric equipment |
-
2021
- 2021-09-14 CN CN202111075079.0A patent/CN113765382B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2852463A1 (en) * | 2003-03-11 | 2004-09-17 | Ge Med Sys Global Tech Co Llc | Voltage converter for power factor correction, has selector to configure switching cell in two configurations among three configurations, where cell uses same transistor in all configurations |
| CN102035386A (en) * | 2009-09-29 | 2011-04-27 | 旭隼科技股份有限公司 | Boost/step-down conversion device and operating method thereof |
| CN102761249A (en) * | 2011-04-29 | 2012-10-31 | 芯传科技股份有限公司 | Current Mode DC Converter |
| CN102868311A (en) * | 2012-09-19 | 2013-01-09 | 华为技术有限公司 | Inverter input-stage circuit with wide voltage input range and inverter |
| KR101440277B1 (en) * | 2013-11-21 | 2014-09-17 | 한밭대학교 산학협력단 | Apparatus of Bidirectional DC-to-DC Converter |
| CN112711286A (en) * | 2019-10-25 | 2021-04-27 | 安徽威灵汽车部件有限公司 | Voltage regulating circuit, voltage regulating control method, voltage regulating device, storage medium and vehicle |
| CN110912406A (en) * | 2019-11-19 | 2020-03-24 | 中国船舶重工集团公司第七一九研究所 | Control method of wide-range high-frequency direct current conversion device |
| CN113364284A (en) * | 2021-06-21 | 2021-09-07 | 珠海格力电器股份有限公司 | Voltage boosting and reducing circuit, control method and electric equipment |
Non-Patent Citations (1)
| Title |
|---|
| BYUNGHEE MOON，等: ""A Modified Topology of Two-Switch Buck-Boost Converter"", 《IEEE ACCESS》, vol. 5, pages 17772 - 17780 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113765382B (en) | 2024-03-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7432614B2 (en) | Single-inductor multiple-output switching converters in PCCM with freewheel switching | |
| JP6434913B2 (en) | Power supply and power supply voltage adjustment method | |
| US10411596B2 (en) | High efficiency power regulator and method | |
| US20090167260A1 (en) | Electrical Power Supply Arrangement and Use Thereof | |
| CN101188380B (en) | Circuits and methods for controlling a converter | |
| CN112165252B (en) | Narrow pulse control-based bootstrap drive circuit of BUCK converter | |
| CN113708626B (en) | Hundred percent duty cycle generating circuit suitable for COT voltage converter | |
| CN115242054B (en) | Power supply circuit for DC-DC converter | |
| US10680521B1 (en) | Boost DC-DC converter circuit with smart anti-ring circuit actuation | |
| US20240146197A1 (en) | Buck-boost converter and control method therefor | |
| US7208920B2 (en) | Buck/boost power converter | |
| CN113765382B (en) | Step-up and step-down working circuit, control method thereof and switching power supply | |
| CN114556763A (en) | Low noise power conversion system and method | |
| CN106533218B (en) | Three-phase rectification circuit and drive control method | |
| US20220158553A1 (en) | Dc-dc converter | |
| CN113098265B (en) | Single-inductor double-output BUCK switching power supply and charge-discharge control method thereof | |
| CN114977761A (en) | Control circuit for improving load shedding transient response of voltage reduction circuit | |
| TW202015323A (en) | Dc-dc converter with step-up/down ability | |
| CN102013801B (en) | Self-bias power management integrated circuit (PMIC) chip power supply | |
| CN114221539A (en) | Charging circuit | |
| CN113098242A (en) | Power tube driving circuit, control method thereof and power switch device | |
| CN112054679A (en) | Positive and negative voltage conversion direct-current power supply and control method thereof | |
| CN216751538U (en) | Soft switch boost chopper circuit | |
| CN216086483U (en) | BOOST type switch power supply voltage regulator | |
| CN219181398U (en) | Active clamp circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |