CN113746338B - Connection circuit and industrial personal computer - Google Patents
Connection circuit and industrial personal computer Download PDFInfo
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- CN113746338B CN113746338B CN202111082462.9A CN202111082462A CN113746338B CN 113746338 B CN113746338 B CN 113746338B CN 202111082462 A CN202111082462 A CN 202111082462A CN 113746338 B CN113746338 B CN 113746338B
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- 230000001276 controlling effect Effects 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 5
- 230000006978 adaptation Effects 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
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Abstract
The embodiment of the application provides a connecting circuit and an industrial personal computer. The connecting circuit comprises a first voltage acquisition unit, a first voltage comparison unit, a first control unit and a first working circuit; the input end of the first voltage acquisition unit is connected with the output end of the adapter, the output end of the first voltage acquisition unit is connected with the input end of the first voltage comparison unit, the output end of the first voltage comparison unit is connected with the input end of the first control unit, the output end of the first control unit is connected with the first working circuit, and the output end of the first working circuit is connected with the frequency pin of the buck-boost circuit; the first control unit is used for receiving the comparison signal output by the first voltage comparison unit and controlling the circuit connection mode of the first working circuit according to the comparison signal, wherein the circuit connection mode is used for adjusting the switching frequency, so that the working state of the BUCK-BOOST can be judged in advance, the energy efficiency of the power supply is improved, the switching loss is reduced, and the voltage balancing efficiency is improved.
Description
Technical Field
The embodiment of the application relates to the technical field of power supply energy efficiency, in particular to a connecting circuit and an industrial personal computer.
Background
The industrial control computer (Industrial Personal Computer, IPC) is a tool for detecting and controlling production process, electromechanical equipment and process equipment by adopting a bus structure, and the adapter is an interface converter, which can be an independent hardware interface device, allows a hardware or electronic interface to be connected with other hardware or electronic interfaces, and can also be an information interface. The power adapter is also called a switch power adapter, is a power supply transformer of small portable electronic equipment and electronic appliances, and electronic devices such as an industrial personal computer often have different voltage requirements in the use process, so that the power adapter is very important in the application process of the industrial personal computer.
The existing adapters in the market are various, common output voltages comprise 5V, 12V, 19V, 24V, 36V, 48V and the like, and in order to adapt to adapters with more types and specifications, a BUCK-BOOST (BUCK-BOOST) circuit is designed at the input end of a main board of the industrial personal computer, and the BUCK-BOOST circuit generally has three working states according to the input and output voltages: the working state of a BUCK-BOOST circuit is determined by comparing the output voltage of the adapter with the voltage required by the industrial personal computer, and the BUCK-BOOST matching of the adapter and the working machine is realized directly through the BUCK-BOOST circuit.
However, in the prior art, the BUCK-BOOST circuit realizes BUCK-BOOST, so that the switching loss is large, and the voltage equalization efficiency is low.
Disclosure of Invention
The application provides a connecting circuit and an industrial personal computer, which are used for solving the technical problems of high switching loss and low voltage balancing efficiency in the prior art that BUCK-BOOST circuit is used for realizing BUCK-BOOST.
In a first aspect, the present application provides a connection circuit for connecting an adapter to a buck-boost circuit, comprising:
the first voltage acquisition unit, the first voltage comparison unit, the first control unit and the first working circuit;
the input end of the first voltage acquisition unit is connected with the output end of the adapter, the output end of the first voltage acquisition unit is connected with the input end of the first voltage comparison unit, the output end of the first voltage comparison unit is connected with the input end of the first control unit, the output end of the first control unit is connected with the first working circuit, and the output end of the first working circuit is connected with the frequency pin of the buck-boost circuit;
the first control unit is used for receiving the comparison signal output by the first voltage comparison unit and controlling a circuit connection mode of the first working circuit according to the comparison signal, wherein the circuit connection mode is used for adjusting the switching frequency.
The application provides a connecting circuit which is arranged between an output end of an adapter and a step-up and step-down circuit, wherein the output voltage of the adapter is firstly input into a first voltage acquisition unit, the first voltage acquisition unit can input the output voltage into a first voltage comparison unit after acquiring the input voltage of the adapter, the first voltage comparison unit compares and judges the output voltage to obtain a comparison signal, and a first control unit can control the circuit connection mode of a first working circuit according to the comparison signal, so that the adjustment of the switching frequency can be realized through the circuit connection mode of the first working circuit.
Optionally, the first working circuit comprises a first resistor and a second resistor;
the first end of the first resistor is connected with the first output end of the first control unit, the second end of the first resistor is connected with the second end of the second resistor and the buck-boost circuit respectively, and the first end of the second resistor is connected with the second output end of the first control unit.
The first working circuit can be formed by the first resistor and the second resistor, and the first working circuit can realize the switching of different working modes by the connection mode of the first resistor and the second resistor, so that the switching frequency can be conveniently and accurately regulated with high efficiency.
Optionally, the first control unit is a first transistor;
when the comparison signal output by the first voltage comparison unit is at a high level, the first transistor is turned on, and the circuit connection mode of the first working circuit is that the first resistor and the second resistor are connected in parallel and then connected to the frequency pin of the buck-boost circuit;
when the comparison signal output by the first voltage comparison unit is not at a high level, the first transistor is turned off, the circuit connection mode of the first working circuit is to disconnect the second resistor, and the first resistor is connected to the frequency pin of the buck-boost circuit.
The first transistor is adopted to realize the control of the circuit connection mode of the first working circuit, when the first voltage comparison unit outputs a high level, namely, when the voltage in the input circuit is larger than a preset threshold value, the step-up and step-down circuit needs to enter a step-down mode, at the moment, the switching frequency can be properly reduced, the quality of the output voltage is not affected, and therefore the transistor can be turned on, and the switching frequency of a power chip in the step-up and step-down circuit can be reduced to a proper value through the parallel connection of the first resistor and the second resistor; when the output of the first voltage comparison unit is not at a high level, the power supply works in a step-up or step-down state, at the moment, the adjustment of reducing the switching frequency is not needed, the first transistor is turned off, only the first resistor is turned on in the first working circuit, and the normal and stable work of the circuit is ensured.
Optionally, the above connection circuit further includes:
the second voltage acquisition unit, the third voltage acquisition unit, the second voltage comparison unit, the third voltage comparison unit, the logic control unit, the second control unit, the third control unit, the second working circuit and the third working circuit;
the input end of the second voltage acquisition unit is connected with the output end of the adapter, the output end of the second voltage acquisition unit is connected with the input end of the second voltage comparison unit, and the output end of the second voltage comparison unit is connected with the first input end of the logic control unit;
the input end of the third voltage acquisition unit is connected with the output end of the adapter, the output end of the third voltage acquisition unit is connected with the input end of the third voltage comparison unit, and the output end of the third voltage comparison unit is connected with the second input end of the logic control unit;
the output end of the logic control unit is respectively connected with the input end of the second control unit and the input end of the third control unit;
the input end of the second control unit is connected with the input end of the second working circuit, and the output end of the second working circuit is connected with the enabling input end of the buck-boost circuit;
the input end of the third control unit is connected with the input end of the third working circuit, and the output end of the third working circuit is connected with the input end of the industrial personal computer main board.
When the target output voltage of the step-up and step-down circuit is the same as the output voltage of the adapter, the application can adopt a straight-through mode, the output voltage of the adapter is not required to be input into the step-up and step-down circuit, and then the output voltage can be input into the working condition machine through step-up and step-down conversion of the step-up and step-down circuit, so that the redundant switching loss caused by the step-up and step-down process is reduced, the efficiency is further improved, and the comparison of the output voltage of the adapter and the target output voltage can be accurately and effectively carried out through the cooperation of the two detection circuits and the logic control unit, and the efficiency of voltage conversion is more accurately improved.
Optionally, the second control unit is a second transistor, and the third control unit is a third transistor;
the second transistor is used for receiving a logic control signal output by the logic control unit and controlling the working mode of the second working circuit according to the logic control signal;
the third transistor is used for receiving a logic control signal output by the logic control unit and controlling the working mode of the third working circuit according to the logic control signal.
The application can accurately, effectively and quickly realize the conversion of the working modes of the second working circuit and the third working circuit through the second transistor and the third transistor, and further improves the efficiency of voltage conversion.
Optionally, the above connection circuit further includes:
when the logic control signal output by the logic control unit is at a high level, the second control unit controls the second working circuit to output an enable off signal, and the third control unit controls the third working circuit to output a target output voltage signal.
Here, when the logic control signal output by the logic control unit is at a high level, that is, when the output voltage of the adapter is equal to the target output voltage, it is not necessary to input a signal into the step-up/step-down circuit to perform a step-up/step-down process, so that switching loss is reduced, therefore, the second working circuit can be controlled by the second control unit to output an enabling off signal, the step-up/step-down circuit is turned off, voltage loss is saved, and meanwhile, the target output voltage signal is output by the third control unit, so that switching loss is effectively reduced, and power energy efficiency is improved.
Optionally, the first voltage acquisition unit includes a first voltage dividing resistor and a second voltage dividing resistor;
the first end of the first voltage dividing resistor is connected with the output end of the adapter, and the second end of the first voltage dividing resistor is respectively connected with the first end of the second voltage dividing resistor and the input end of the first voltage comparison unit;
the second end of the second voltage dividing resistor is grounded.
The application realizes the acquisition of the output voltage of the adapter, namely the input voltage of the connecting circuit, through the first voltage dividing resistor and the second voltage dividing resistor, and can accurately and effectively acquire the voltage value of the output voltage of the adapter through the voltage dividing of the two resistors.
Optionally, the second voltage acquisition unit includes a third voltage dividing resistor and a fourth voltage dividing resistor;
the first end of the third voltage dividing resistor is connected with the output end of the adapter, and the second end of the third voltage dividing resistor is respectively connected with the first end of the fourth voltage dividing resistor and the input end of the second voltage comparing unit;
the second end of the fourth voltage dividing resistor is grounded;
the third voltage acquisition unit comprises a fifth voltage dividing resistor and a sixth voltage dividing resistor;
the first end of the fifth voltage dividing resistor is connected with the output end of the adapter, and the second end of the fifth voltage dividing resistor is respectively connected with the first end of the sixth voltage dividing resistor and the input end of the third voltage comparison unit;
the second end of the third voltage dividing resistor is grounded.
Optionally, the logic control unit is a logic and gate.
The logic AND gate is adopted in the application, so that whether the voltages are equal or not can be accurately judged, and the accuracy of voltage comparison is further improved.
Optionally, the third working circuit includes a third transistor and a fourth transistor;
the third transistor and the fourth transistor are connected in series.
The third transistor and the fourth transistor are connected in series, so that the voltage reverse-filling phenomenon caused when the output voltage of the buck-boost circuit is larger than the input voltage of the buck-boost circuit in the boost working mode can be prevented, the energy efficiency of the power supply is improved, and the service lives of the power supply and devices in the circuit are further prolonged.
In a second aspect, the present application provides an industrial personal computer, including an industrial personal computer motherboard, a buck-boost circuit connected to an input end of the industrial personal computer motherboard, and a connection circuit connected to an input end of the buck-boost circuit according to the first aspect and the optional manner of the first aspect.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a schematic structural diagram of a connection circuit according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a first voltage acquisition unit according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a first working circuit according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of another connection circuit according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a connection circuit according to an embodiment of the present application.
Reference numerals:
101: a first voltage acquisition unit;
102: a first voltage comparing unit;
103: a first control unit;
104: a first operating circuit;
105: an adapter;
1051: an output of the adapter;
106: a step-up/step-down circuit;
1061: a frequency pin of the buck-boost circuit;
401: a second voltage acquisition unit;
405: a third voltage acquisition unit;
402: a second voltage comparing unit;
406: a third voltage comparing unit;
409: a logic control unit;
403: a second control unit;
407: a third control unit;
404: a second operating circuit;
408: and a third operating circuit.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals refer to the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of the application. The embodiments described below by referring to the drawings are exemplary and intended to illustrate embodiments of the application and should not be construed as limiting the embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are intended to be within the scope of the embodiments of the present application. Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
In describing embodiments of the present application, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "coupled" should be construed broadly, and may be, for example, fixedly coupled, indirectly coupled through an intermediary, in communication between two elements, or in an interaction relationship between two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.
At present, in order to adapt to adapters with more types of specifications, an industrial personal computer is provided with a BUCK-BOOST circuit at the input end of a main board of the industrial personal computer, the output voltage of the adapter is input into the BUCK-BOOST circuit, the voltage meeting the requirements of a working machine is output to the working machine through the BUCK-BOOST operation of the BUCK-BOOST circuit, the BUCK-BOOST circuit is usually switched in three working states of a BOOST mode (BOOST), a BUCK mode (BUCK) and a BUCK-BOOST mode (BUCK-BOOST) according to the input and output voltage, and the voltage matching is realized due to the difference of the working principles of the three modes. The buck-boost circuit output 12V is illustrated: if the input voltage is less than 12V, the output and the inductor are intermittent when the power supply works in a BOOST mode, namely the output current is in an intermittent mode, when the switching tube is turned off, the load current is all provided by the output capacitor, and under the condition of BUCK, the output is directly connected with the inductor, and part of the load current is provided by the output capacitor and the other part of the load current is provided by the inductor, so that the fluctuation of the output voltage is far less than the BOOST when the power supply works in the BUCK state; in addition, if the input matching is just a 12V adapter, the BUCK-BOOST still works, and redundant switching loss is brought. Therefore, the prior art directly adopts a BUCK-BOOST circuit to realize voltage rising and falling, so that the switching loss is large, and the voltage balancing efficiency is low.
In order to solve the technical problems, an embodiment of the present application provides a connection circuit, which is disposed between an adapter and a buck-boost circuit, and by detecting an output voltage of the adapter, an operating state of the buck-boost circuit is determined in advance, so as to improve a power energy efficiency in a part of the operating states.
The charging protection system provided by the embodiment of the application is described in detail below with reference to specific embodiments.
Fig. 1 is a schematic structural diagram of a connection circuit according to an embodiment of the present application. As shown in fig. 1, a connection circuit according to an embodiment of the present application includes: a first voltage acquisition unit 101, a first voltage comparison unit 102, a first control unit 103, and a first operation circuit 104.
An input end of the first voltage acquisition unit 101 is connected to an output end 1051 of the adapter 105, an output end of the first voltage acquisition unit 101 is connected to an input end of the first voltage comparison unit 102, an output end of the first voltage comparison unit 102 is connected to an input end of the first control unit 103, an output end of the first control unit 103 is connected to the first operation circuit 104, and an output end of the first operation circuit 104 is connected to a frequency pin (RFEQ) 1061 of the step-up/down circuit 106.
The first control unit 103 is configured to receive the comparison signal output by the first voltage comparison unit 102, and control a circuit connection manner of the first working circuit 104 according to the comparison signal.
The circuit connection mode is used for adjusting the switching frequency.
The output signal of the adapter is the input signal of the connecting circuit.
Optionally, fig. 2 is a schematic structural diagram of a first voltage acquisition unit according to an embodiment of the present application, where, as shown in fig. 2, the first voltage acquisition unit includes a first voltage dividing resistor R11 and a second voltage dividing resistor R12.
A first end of the first voltage dividing resistor R11 is connected to the output end 1051 of the adapter 105, and a second end of the first voltage dividing resistor R11 is connected to a first end of the second voltage dividing resistor R12 and an input end of the first voltage comparing unit 102, respectively; the second terminal of the second voltage dividing resistor R12 is grounded.
Alternatively, the resistance values of the first voltage dividing resistor and the second voltage dividing resistor may be determined according to practical situations, which is not particularly limited in the embodiment of the present application.
Optionally, the first voltage dividing resistor and the second voltage dividing resistor may be variable resistors, so that resistance adjustment is convenient to obtain the output voltage of the adapter more accurately, or may be fixed resistors, and the types of the first voltage dividing resistor and the second voltage dividing resistor are not particularly limited.
The output voltage of the adapter, namely the input voltage of the connecting circuit, is obtained through the first voltage dividing resistor and the second voltage dividing resistor, the voltage value of the output voltage of the adapter can be accurately and effectively obtained through voltage division of the two resistors, the cost is low, the cost is reduced, and the power supply efficiency is improved.
Optionally, the first voltage comparing unit is a comparator. The reference voltage of the comparator may be 2.5V as the REF pin reference voltage of TL 431. The comparator may be a single-limit comparator, a hysteresis comparator, a window comparator, or a tri-state voltage comparator, which is not particularly limited in the embodiment of the present application.
Optionally, fig. 3 is a schematic structural diagram of a first working circuit according to an embodiment of the present application, and as shown in fig. 3, the first working circuit 104 includes a first resistor R41 and a second resistor R42.
The first end of the first resistor R41 is connected to the first output end of the first control unit 103, the second end of the first resistor R41 is connected to the second end of the second resistor R42 and the step-up/step-down circuit 106, and the first end of the second resistor R42 is connected to the second output end of the first control unit 103.
Optionally, the first end of the second resistor and the second end of the control unit are grounded.
Alternatively, the resistance values of the first resistor and the second resistor may be determined according to practical situations, which is not particularly limited in the embodiment of the present application.
Optionally, the first resistor and the second resistor may be variable resistors, so that resistance adjustment is convenient to obtain the output voltage of the adapter more accurately, or may be fixed resistors, and the types of the first resistor and the second resistor are not particularly limited in the embodiment of the present application.
The first control unit can control whether the second resistor R42 is connected to the circuit or not to realize adjustment of the switching frequency of the buck-boost power supply. The original switching frequency of the buck-boost circuit power supply chip can be reduced to a proper value by selecting a proper R42 in parallel with the original switching frequency setting resistor R41.
The first working circuit can be formed by the first resistor and the second resistor, and the first working circuit can realize switching of different working modes in a connection mode of the first resistor and the second resistor, so that the switching frequency can be conveniently and accurately regulated with high efficiency.
Optionally, the first control unit is a first transistor.
When the comparison signal output by the first voltage comparison unit is at a high level, the first transistor is opened, and the circuit connection mode of the first working circuit is that the first resistor and the second resistor are connected in parallel and then connected to the frequency pin of the step-up/step-down circuit; when the comparison signal output by the first voltage comparison unit is not at a high level, the first transistor is turned off, the circuit connection mode of the first working circuit is to disconnect the second resistor, and the first resistor is connected to the frequency pin of the buck-boost circuit.
Alternatively, the first control unit may be a transistor or a switching element such as a thyristor.
Specifically, when the power supply works at BOOST, the output and the inductor are intermittent, i.e. the output current is in an intermittent mode, and when the switching tube is turned off, the load current is all provided by the output capacitor, while in the case of BUCK, the output and the inductor are directly connected, and part of the load current is provided by the output capacitor and part of the load current is provided by the inductor, so that the fluctuation of the output voltage is far smaller than that of BOOST when the power supply works at BUCK. When the power supply works in BUCK, the switching frequency can be properly reduced, so that the switching loss is reduced and the efficiency is improved under the condition that the output meets the specification. If the output voltage of the adapter is greater than the first preset threshold value, the comparison signal output by the first voltage comparison unit is at a high level, and the first resistor and the second resistor can be controlled by the first control unit to be connected in series into the circuit, so that the switching frequency is reduced. The first preset threshold may be determined according to practical situations, which is not specifically limited in the embodiment of the present application.
Optionally, if the comparison signal output by the first voltage comparison unit is not at a high level, the first control unit controls the first resistor to be connected, and the second resistor branch does not work, so that normal and stable operation of the circuit is ensured.
Here, the embodiment of the application adopts the first transistor to realize the control of the circuit connection mode of the first working circuit, when the first voltage comparison unit outputs a high level, namely, when the voltage in the input circuit is greater than a preset threshold value, the step-up and step-down circuit needs to enter a step-down mode, at the moment, the switching frequency can be properly reduced, the quality of the output voltage is not affected, therefore, the transistor can be turned on, and the switching frequency of a power chip in the step-up and step-down circuit can be reduced to a proper value through the parallel connection of the first resistor and the second resistor; when the output of the first voltage comparison unit is not at a high level, the power supply works in a step-up or step-down state, at the moment, the adjustment of reducing the switching frequency is not needed, the first transistor is turned off, only the first resistor is turned on in the first working circuit, and the normal and stable work of the circuit is ensured.
The connection circuit provided by the embodiment of the application is arranged between the output end of the adapter and the step-up and step-down circuit, the output voltage of the adapter is firstly input into the first voltage acquisition unit, the first voltage acquisition unit can input the output voltage into the first voltage comparison unit after acquiring the input voltage of the adapter, the first voltage comparison unit compares and judges the output voltage to obtain a comparison signal, and the first control unit can control the circuit connection mode of the first working circuit according to the comparison signal, so that the adjustment of the switching frequency can be realized through the circuit connection mode of the first working circuit.
In a possible implementation manner, the connection circuit provided in the embodiment of the present application may further reduce the switching frequency and power consumption of the power supply in a through manner, and correspondingly, fig. 4 is a schematic structural diagram of another connection circuit provided in the embodiment of the present application, as shown in fig. 4, where the connection circuit further includes:
a second voltage acquisition unit 401, a third voltage acquisition unit 405, a second voltage comparison unit 402, a third voltage comparison unit 406, a logic control unit 409, a second control unit 403, a third control unit 407, a second operation circuit 404, and a third operation circuit 408;
an input end of the second voltage acquisition unit 401 is connected with an output end of the adapter 105, an output end of the second voltage acquisition unit 401 is connected with an input end of the second voltage comparison unit 402, and an output end of the second voltage comparison unit 402 is connected with a first input end of the logic control unit 409; an input end of the third voltage acquisition unit 405 is connected with an output end of the adapter 105, an output end of the third voltage acquisition unit 405 is connected with an input end of the third voltage comparison unit 406, and an output end of the third voltage comparison unit 406 is connected with a second input end of the logic control unit 409; the output end of the logic control unit 409 is connected to the input end of the second control unit 403 and the input end of the third control unit 407, respectively; an input terminal of the second control unit 403 is connected to an input terminal of the second working circuit 404, and an output terminal of the second working circuit 404 is connected to an enable input terminal 1062 of the step-up/step-down circuit 106; an input end of the third control unit 407 is connected to an input end of the third working circuit 408, and an output end of the third working circuit 408 is connected to an input end of the industrial personal computer main board 410.
Optionally, the second control unit is a second transistor, and the third control unit is a third transistor; the second transistor is used for receiving a logic control signal output by the logic control unit and controlling the working mode of the second working circuit according to the logic control signal; the third transistor is used for receiving a logic control signal output by the logic control unit and controlling the working mode of the third working circuit according to the logic control signal.
Alternatively, the second control unit and the third control unit may be switching elements such as a transistor or a thyristor.
Optionally, the above connection circuit further includes:
when the logic control signal output by the logic control unit is at a high level, the second control unit controls the second working circuit to output an enable off signal, and the third control unit controls the third working circuit to output a target output voltage signal.
Here, when the logic control signal output by the logic control unit is at a high level, that is, when the output voltage of the adapter is equal to the target output voltage, it is not necessary to input a signal into the step-up/step-down circuit to perform a step-up/step-down process, so that switching loss is reduced, therefore, the second working circuit can be controlled by the second control unit to output an enabling off signal, the step-up/step-down circuit is turned off, voltage loss is saved, and meanwhile, the target output voltage signal is output by the third control unit, so that switching loss is effectively reduced, and power energy efficiency is improved.
Optionally, the third working circuit includes a third transistor and a fourth transistor;
the third transistor and the fourth transistor are connected in series.
In one possible implementation, the third and fourth transistors may be field effect transistors (MOSFETs)
Here, the third transistor and the fourth transistor are connected in series, so that the voltage reverse-filling phenomenon caused when the output voltage of the buck-boost circuit is larger than the input voltage of the buck-boost circuit in the boost working mode can be prevented, the energy efficiency of the power supply is improved, and the service lives of the power supply and devices in the circuit are further prolonged.
Specifically, if the voltage of the input connection circuit is the same as the voltage of the output, the BUCK-BOOST in the prior art can be disabled, and a MOS through mode is adopted, so that no switching loss exists, and the efficiency is provided.
The embodiment of the application can accurately, effectively and quickly realize the conversion of the working modes of the second working circuit and the third working circuit through the second transistor and the third transistor, and further improves the efficiency of voltage conversion.
Optionally, the second voltage acquisition unit includes a third voltage dividing resistor and a fourth voltage dividing resistor;
the first end of the third voltage dividing resistor is connected with the output end of the adapter, and the second end of the third voltage dividing resistor is respectively connected with the first end of the fourth voltage dividing resistor and the input end of the second voltage comparing unit; the second end of the fourth voltage dividing resistor is grounded; the third voltage acquisition unit comprises a fifth voltage dividing resistor and a sixth voltage dividing resistor; the first end of the fifth voltage dividing resistor is connected with the output end of the adapter, and the second end of the fifth voltage dividing resistor is respectively connected with the first end of the sixth voltage dividing resistor and the input end of the third voltage comparing unit; the second end of the third voltage dividing resistor is grounded. Here, the implementation manners of the second voltage acquisition unit and the third voltage acquisition unit are similar to those of the first voltage acquisition unit, and are not described herein.
Optionally, the logic control unit is a logic and gate.
Here, the embodiment of the application adopts the logic AND gate, so that whether the voltages are equal or not can be accurately judged, and the accuracy of voltage comparison is further improved.
When the target output voltage of the step-up and step-down circuit is the same as the output voltage of the adapter, the embodiment of the application can adopt a straight-through mode, the output voltage of the adapter is not required to be input into the step-up and step-down circuit, and then the output voltage can be input into the working condition machine through step-up and step-down conversion of the step-up and step-down circuit, so that the redundant switching loss caused by the step-up and step-down process is reduced, the efficiency is further improved, and the comparison of the output voltage of the adapter and the target output voltage can be accurately and effectively carried out through the cooperation of the two detection circuits and the logic control unit, and the efficiency of voltage conversion is more accurately improved.
Optionally, resistors may be added to the above structure where needed to ensure more efficient operation of the circuit, and are not particularly limited or illustrated herein.
Fig. 5 is a schematic structural diagram of a connection circuit according to an embodiment of the present application, as shown in fig. 5, where the connection circuit includes: the first voltage dividing resistor R11, the second voltage dividing resistor R12, the first comparator U1, the first base resistor R3, the first transistor Q1, the first resistor R41, the second resistor R42, the third voltage dividing resistor R21, the third voltage dividing resistor R22, the second comparator U2, the fifth voltage dividing resistor R31, the sixth voltage dividing resistor R32, the third comparator U3, the logic AND gate U4, the second base resistor R4, the third base resistor R5, the second transistor Q2, the third transistor Q3, the fourth base resistor R6, the first MOS transistor Q5, the second MOS transistor Q6, the third resistor R7, the fourth resistor R8 and the first capacitor C11. The specific connection is shown in fig. 5 and the above embodiment.
As shown in fig. 5, when the input voltage of the BUCK-BOOST is higher than the output value, the BUCK-BOOST enters the BUCK working mode, the voltage can be measured by selecting proper R11 and R12 matching, when the input voltage is higher than the output value, the comparator U1 outputs a high level, Q1 is opened, and the original switching frequency of the BUCK-BOOST circuit connected with the output can be reduced to a proper value by selecting proper R42 and connecting the same with the original switching frequency setting resistor R41 in parallel; when the input voltage is lower than this value, the power supply is operated in BUCK-BOOST or BOOST state, Q1 is turned off, and the switching frequency is the value originally set by R41.
Assuming that the working voltage range of the output voltage VOUT is vout±v0, respectively setting the threshold of the output voltage of the adapter, that is, the input voltage VIN of the connection current, to vout+v0 and VOUT-V0 through R21, R22, R31, R32, that is, U2 outputs a high level when VIN is smaller than vout+v0, and U3 is a high level when VIN is larger than VOUT-V0; the output of U2 and U3 is connected to an AND gate U4, namely when the voltage value of VIN is between VOUT-V0 and VOUT+V0, U4 outputs high level, at the moment, we judge that the input voltage is equal to the output voltage, the enable end EN of the power chip is turned off through Q2, and the power supply does not work; simultaneously, Q3 is turned on, allowing Q5 and Q6 to conduct, and allowing input VIN to be directly connected to VOUT through Q5 and Q6. The two MOS transistors connected in series can prevent the situation that VOUT is higher than VIN under the BOOST working condition and the VOUT is reversely filled into VIN.
Alternatively, the structure of the third working circuit may be omitted, the output of the U4 is directly connected to the output terminal, and when the input voltage is equal to the output voltage, that is, the output of the U4 is at a high level, the step-up and step-down circuit is directly controlled by the logic inside the step-up and step-down circuit to not perform step-up and step-down operation.
The embodiment of the application also provides an industrial personal computer, which comprises an industrial personal computer main board, a step-up/step-down circuit connected with the input end of the industrial personal computer main board, and a connecting circuit connected with the input end of the step-up/step-down circuit in the optional modes as in the first aspect and the first aspect.
The step-up and step-down circuit is used for the adapter of industrial personal computer adaptation more multiple class specification, and the connecting circuit can judge the operating condition of step-up and step-down circuit in advance, improves the power efficiency under partial operating condition, has further improved the performance of industrial personal computer.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. The embodiments of the present application are intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (9)
1. A connection circuit for connecting an adapter to a buck-boost circuit, comprising:
the first voltage acquisition unit, the first voltage comparison unit, the first control unit and the first working circuit;
the input end of the first voltage acquisition unit is connected with the output end of the adapter, the output end of the first voltage acquisition unit is connected with the input end of the first voltage comparison unit, the output end of the first voltage comparison unit is connected with the input end of the first control unit, the output end of the first control unit is connected with the first working circuit, and the output end of the first working circuit is connected with the frequency pin of the buck-boost circuit;
the first control unit is used for receiving the comparison signal output by the first voltage comparison unit and controlling a circuit connection mode of the first working circuit according to the comparison signal, wherein the circuit connection mode is used for adjusting the switching frequency;
further comprises:
the second voltage acquisition unit, the third voltage acquisition unit, the second voltage comparison unit, the third voltage comparison unit, the logic control unit, the second control unit, the third control unit, the second working circuit and the third working circuit;
the input end of the second voltage acquisition unit is connected with the output end of the adapter, the output end of the second voltage acquisition unit is connected with the input end of the second voltage comparison unit, and the output end of the second voltage comparison unit is connected with the first input end of the logic control unit;
the input end of the third voltage acquisition unit is connected with the output end of the adapter, the output end of the third voltage acquisition unit is connected with the input end of the third voltage comparison unit, and the output end of the third voltage comparison unit is connected with the second input end of the logic control unit;
the output end of the logic control unit is respectively connected with the input end of the second control unit and the input end of the third control unit;
the output end of the second control unit is connected with the input end of the second working circuit, and the output end of the second working circuit is connected with the enabling input end of the buck-boost circuit;
the output end of the third control unit is connected with the input end of the third working circuit, and the output end of the third working circuit is connected with the input end of the industrial personal computer main board.
2. The connection circuit of claim 1, wherein the first operating circuit comprises a first resistor and a second resistor;
the first end of the first resistor is connected with the first output end of the first control unit, the second end of the first resistor is connected with the second end of the second resistor and the buck-boost circuit respectively, and the first end of the second resistor is connected with the second output end of the first control unit.
3. The connection circuit according to claim 2, wherein the first control unit is a first transistor;
when the comparison signal output by the first voltage comparison unit is at a high level, the first transistor is turned on, and the circuit connection mode of the first working circuit is that the first resistor and the second resistor are connected in parallel and then connected to the frequency pin of the buck-boost circuit;
when the comparison signal output by the first voltage comparison unit is not at a high level, the first transistor is turned off, the circuit connection mode of the first working circuit is to disconnect the second resistor, and the first resistor is connected to the frequency pin of the buck-boost circuit.
4. The connection circuit according to claim 1, wherein the second control unit is a second transistor, and the third control unit is a third transistor;
the second transistor is used for receiving a logic control signal output by the logic control unit and controlling the working mode of the second working circuit according to the logic control signal;
the third transistor is used for receiving a logic control signal output by the logic control unit and controlling the working mode of the third working circuit according to the logic control signal.
5. The connection circuit according to claim 1 or 4, further comprising:
when the logic control signal output by the logic control unit is at a high level, the second control unit controls the second working circuit to output an enable off signal, and the third control unit controls the third working circuit to output a target output voltage signal.
6. A connection circuit according to any one of claims 1 to 3, wherein the first voltage acquisition unit includes a first voltage dividing resistor and a second voltage dividing resistor;
the first end of the first voltage dividing resistor is connected with the output end of the adapter, and the second end of the first voltage dividing resistor is respectively connected with the first end of the second voltage dividing resistor and the input end of the first voltage comparison unit;
the second end of the second voltage dividing resistor is grounded.
7. The connection circuit according to claim 1 or 4, wherein the second voltage acquisition unit includes a third voltage dividing resistor and a fourth voltage dividing resistor;
the first end of the third voltage dividing resistor is connected with the output end of the adapter, and the second end of the third voltage dividing resistor is respectively connected with the first end of the fourth voltage dividing resistor and the input end of the second voltage comparing unit;
the second end of the fourth voltage dividing resistor is grounded;
the third voltage acquisition unit comprises a fifth voltage dividing resistor and a sixth voltage dividing resistor;
the first end of the fifth voltage dividing resistor is connected with the output end of the adapter, and the second end of the fifth voltage dividing resistor is respectively connected with the first end of the sixth voltage dividing resistor and the input end of the third voltage comparison unit;
the second end of the third voltage dividing resistor is grounded.
8. The connection circuit according to claim 1 or 4, wherein the third operation circuit includes a third transistor and a fourth transistor;
the third transistor and the fourth transistor are connected in series.
9. An industrial personal computer, comprising an industrial personal computer main board, a step-up/step-down circuit connected with an input end of the industrial personal computer main board, and the connection circuit according to any one of claims 1 to 8 connected with the input end of the step-up/step-down circuit.
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| CN202111082462.9A CN113746338B (en) | 2021-09-15 | 2021-09-15 | Connection circuit and industrial personal computer |
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| CN202111082462.9A CN113746338B (en) | 2021-09-15 | 2021-09-15 | Connection circuit and industrial personal computer |
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| CN113746338B true CN113746338B (en) | 2023-11-24 |
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| JP2016178800A (en) * | 2015-03-20 | 2016-10-06 | コーセル株式会社 | Switching power supply device |
| CN110233563A (en) * | 2019-07-24 | 2019-09-13 | 浙江德力西电器有限公司 | A kind of FM circuit and Switching Power Supply |
| CN112994457A (en) * | 2021-02-24 | 2021-06-18 | 歌尔微电子股份有限公司 | Switching power supply circuit, switching power supply chip and electronic equipment |
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| JP2016178800A (en) * | 2015-03-20 | 2016-10-06 | コーセル株式会社 | Switching power supply device |
| CN205430047U (en) * | 2015-11-05 | 2016-08-03 | 西安福华力能电源有限公司 | Pressure regulating protection circuit |
| CN110233563A (en) * | 2019-07-24 | 2019-09-13 | 浙江德力西电器有限公司 | A kind of FM circuit and Switching Power Supply |
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| CN113746338A (en) | 2021-12-03 |
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