CN115313862A - DC-DC conversion circuit through control device and method - Google Patents
DC-DC conversion circuit through control device and method Download PDFInfo
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- CN115313862A CN115313862A CN202210942869.2A CN202210942869A CN115313862A CN 115313862 A CN115313862 A CN 115313862A CN 202210942869 A CN202210942869 A CN 202210942869A CN 115313862 A CN115313862 A CN 115313862A
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a direct connection control device of a DC-DC conversion circuit, which comprises an input module, the DC-DC conversion circuit, an output module, a direct connection control module, a constant current source voltage regulating signal extraction and conversion module and a protocol circuit, wherein the protocol circuit converts the output voltage requirement of the output module into a constant current source voltage regulating signal; the constant current source voltage regulating signal extraction and conversion module generates a feedback signal according to the constant current source voltage regulating signal to control the DC-DC conversion circuit to be in a direct connection mode or a working mode, in the working mode, the feedback signal controls the DC-DC conversion circuit to convert the voltage of the input module and then send the converted voltage to the output module, in the direct connection mode, the direct connection control signal is sent to the direct connection control module, and the direct connection control module sends the voltage of the input module to the output module. Therefore, under the condition that the work of the DC-DC conversion circuit is not influenced, the DC-DC direct connection can be realized when the output voltage requirement is large, and the work efficiency of the system is improved; meanwhile, the system does not need to be bound with a specific protocol for use, and is simple in structure and low in cost.
Description
Technical Field
The invention relates to the technical field of power supply circuits, in particular to a direct connection control device and method of a DC-DC conversion circuit.
Background
For a long time, the output of the conventional power supply is a fixed voltage. With the popularization of new technologies such as 5G, internet of things and the like, new adjustable power supplies such as PD power supplies and automatic adjustable or protocol communication adjustable power electronic devices have been brought forward. Compared with the traditional power supply with fixed voltage output, the automatic adjustable power supply has the following advantages: configuration diversification of outputs (e.g., custom diversification, combination diversification, etc.); wide dynamic output voltage (e.g., 3.3-48V output continuously adjustable); up to an output current of 5A.
In order to realize output diversity, most power supply topologies adopt a structure of AC/DC + DC/DC (one or more paths). Since the output current is generally 3A-5A at the maximum, the higher the output voltage is, the higher the output power is, the higher the heating power is, and therefore, the more one-stage DC/DC further reduces the system efficiency. Therefore, DC/DC is desirable to be straight through at high power gear to improve overall efficiency. However, the conventional protocol does not support DC/DC pass-through, and DC/DC does not work during pass-through. Individual custom chips can be made, but the DC/DC is bound with the protocol, so the cost is high, the supply is difficult, and the scheme selection is not flexible.
Based on this, a new solution is needed.
Disclosure of Invention
The invention mainly aims to provide a through control device and a through control method for a DC-DC conversion circuit.
In order to achieve the above object, the present invention provides a direct connection control device of a DC-DC conversion circuit, which includes an input module, a DC-DC conversion circuit, and an output module, wherein the DC-DC conversion circuit is connected between the input module and the output module, and further includes a direct connection control module, a constant current source voltage regulation signal extraction and conversion module, and a protocol circuit, wherein the constant current source voltage regulation signal extraction and conversion module is connected to the direct connection control module, the protocol circuit is further connected to the output module, the direct connection control module is further connected between the input module and the output module, and the protocol circuit converts an output voltage requirement of the output module into a constant current source voltage regulation signal and feeds the constant current source voltage regulation signal back to the constant current source voltage regulation signal extraction and conversion module; the constant current source voltage regulating signal extraction and conversion module generates a feedback signal according to the constant current source voltage regulating signal, the DC-DC conversion circuit is controlled to be in a direct connection mode or a working mode through the feedback signal, the DC-DC conversion circuit is controlled to convert the voltage of the input module and then send the converted voltage to the output module in the working mode, the DC-DC conversion circuit is controlled to stop conversion and send a direct connection control signal to the direct connection control module in the direct connection mode, and the direct connection control module sends the voltage of the input module to the output module.
In the direct connection control device of the DC-DC conversion circuit provided by the present invention, the constant current source voltage regulation signal extraction and conversion module includes a constant current source voltage regulation signal conversion unit and a constant current source voltage regulation signal extraction unit, the constant current source voltage regulation signal conversion unit is configured to convert the constant current source voltage regulation signal into the feedback signal, and transmit the feedback signal to the feedback pin of the DC-DC conversion circuit to control the DC-DC conversion circuit to convert the voltage of the input module and then transmit the converted voltage to the output module; the constant current source voltage regulating signal extraction unit is used for judging whether the feedback signal reaches the through threshold value or not, and controlling the DC-DC conversion circuit to stop conversion and simultaneously sending a through control signal to the through control module through the feedback signal when the feedback signal reaches the through threshold value.
In the direct connection control device of the DC-DC conversion circuit, the constant current source voltage regulating signal conversion unit comprises a resistor R20, a resistor R16, a resistor R23, a resistor R11, a resistor R13, a resistor R18, a resistor R19, a resistor R24, a resistor R27, a triode Q3, a capacitor C5 and an adjustable precision voltage stabilizing source IC1, the constant current source voltage regulating signal is connected with the control end of the adjustable precision voltage stabilizing source IC1 and the first end of the resistor R24, the second end of the resistor R24 is grounded, and the anode of the adjustable precision voltage stabilizing source IC1 is grounded through the resistor R27; the cathode of the adjustable precise voltage-stabilizing source IC1 is connected to the base electrode of the triode Q3 through a resistor R19; the first end of the resistor R11 is connected with the emitter of the triode Q3, the second end of the resistor R11 is connected with the first end of the resistor R18 and the first end of the resistor R13, and the second end of the resistor R13 is connected with the base of the triode Q3; the second end of the resistor R18 is connected with the first end of the capacitor C5 and the control end of the adjustable precise voltage-stabilizing source IC1, and the second end of the capacitor C5 is connected with the cathode of the adjustable precise voltage-stabilizing source IC 1; a first end of the resistor R20 is connected with a feedback pin of the DC-DC conversion circuit and a first end of the resistor R16, a second end of the resistor R20 is connected with a first end of the resistor R23, and a second end of the resistor R23 is grounded; the second end of the resistor R16 is connected to the output pin of the DC-DC conversion circuit.
In the direct connection control device of the DC-DC conversion circuit, the constant current source voltage regulating signal extraction unit comprises a resistor R12, a resistor R14, a resistor R17, a resistor R21, a resistor R22, a resistor R25, a resistor R26, a capacitor C4, a diode D4, a voltage stabilizing diode ZD1, a voltage stabilizing diode ZD2, an adjustable precise voltage stabilizing source IC2 and a field effect tube Q4; a first end of the resistor R14 and a first end of the resistor R12 are connected to a collector of the triode Q3, and a second end of the resistor R14 is connected to a first end of the resistor R21 and a first end of the resistor R25; the second end of the resistor R21 is connected with the first end of the capacitor C4 and the control end of the adjustable precision voltage-stabilizing source IC 2; the second end of the resistor R25 is connected with the anode of the adjustable precision voltage-stabilizing source IC2 and the first end of the resistor R23; the second end of the resistor R12 is connected with the anode of the diode D4 and the cathode of the voltage stabilizing diode ZD2, the anode of the voltage stabilizing diode ZD2 is grounded, and the cathode of the diode D4 is connected with the second end of the capacitor C4, the cathode of the adjustable precise voltage stabilizing source IC2, the first end of the resistor R17 and the cathode of the voltage stabilizing diode ZD 1; the positive electrode of the voltage stabilizing diode ZD1 is connected with the first end of the resistor R22, the first end of the resistor R26 and the grid electrode of the field effect transistor Q4; the source electrode of the field effect transistor Q4 is connected with the anode of the adjustable precise voltage-stabilizing source IC1 and the second end of the resistor R26, and the drain electrode of the field effect transistor Q4 is connected with the direct connection control module; the second end of the resistor R22 is connected with the feedback pin of the DC-DC conversion circuit.
In the direct connection control device of the DC-DC conversion circuit, the direct connection control module comprises a resistor R9, a resistor R10 and a field effect transistor Q2, a grid electrode of the field effect transistor Q2 is connected with a first end of the resistor R9 and a first end of the resistor R10, a second end of the resistor R10 is connected with a drain electrode of the field effect transistor Q4, a source electrode of the field effect transistor Q2 is connected with a second end of the resistor R9 and an input pin of the DC-DC conversion circuit, and a drain electrode of the field effect transistor Q2 is connected with an output pin of the DC-DC conversion circuit.
The present invention also provides a method for controlling the DC-DC conversion circuit, which adopts the DC-DC conversion circuit, and includes:
the protocol circuit converts the output voltage requirement of the output module into a constant current source voltage regulating signal and feeds the constant current source voltage regulating signal back to the constant current source voltage regulating signal extraction and conversion module;
the constant current source voltage regulating signal extraction and conversion module generates a feedback signal according to the constant current source voltage regulating signal, controls the DC-DC conversion circuit to be in a direct-through mode or a working mode through the feedback signal,
in the working mode, the DC-DC conversion circuit is controlled by the feedback signal to convert the voltage of the input module and then send the converted voltage to the output module, in the direct-through mode, the DC-DC conversion circuit is controlled to stop conversion and send a direct-through control signal to the direct-through control module, and the direct-through control module sends the voltage of the input module to the output module.
In the through control method of the DC-DC conversion circuit provided by the present invention, the constant current source voltage regulating signal extracting and converting module generates a feedback signal according to the constant current source voltage regulating signal, and the step of controlling the DC-DC conversion circuit to be in the through mode or the working mode by the feedback signal includes:
converting the constant current source voltage regulating signal into the feedback signal, transmitting the feedback signal to a feedback pin of the DC-DC conversion circuit to control the DC-DC conversion circuit to convert the voltage of the input module and then transmitting the converted voltage to the output module;
and judging whether the feedback signal reaches the direct connection threshold value, and controlling the DC-DC conversion circuit to stop conversion and simultaneously sending a direct connection control signal to the direct connection control module through the feedback signal when the feedback signal reaches the direct connection threshold value.
The direct connection control device and the direct connection control method of the DC-DC conversion circuit have the following beneficial effects: the direct connection control device of the DC-DC conversion circuit extracts the constant current source voltage regulating signal at the output end and converts the constant current source voltage regulating signal to feed back to the DC-DC conversion circuit, and the DC/DC voltage regulation is not influenced at ordinary times; when the extracted constant current source voltage regulating signal reaches a direct-connection threshold value, a direct-connection control signal is output to control the voltage of the input end to be directly output to the output end, and a feedback signal is improved to enable the DC-DC conversion circuit to feed back overhigh voltage and stop working; therefore, under the condition that the work of the DC-DC conversion circuit is not influenced, the DC-DC direct connection can be realized when the output voltage requirement is large, and the work efficiency of the system is improved; meanwhile, the system does not need to be bound with a specific protocol for use, and is simple in structure and low in cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts:
fig. 1 is a schematic block diagram of a shoot-through control device of a DC-DC conversion circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a shoot-through control device of a DC-DC conversion circuit according to an embodiment of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Exemplary embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
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.
The general idea of the invention is as follows: the invention provides a direct connection control device of a DC-DC conversion circuit, aiming at the problem that the DC direct connection can not be realized in the existing adjustable power supply or the DC direct connection can be realized by a customized chip, wherein a constant current source voltage regulating signal at the output end is extracted and converted and fed back to the DC-DC conversion circuit, and the DC/DC voltage regulation is not influenced at ordinary times; when the extracted constant current source voltage regulating signal reaches a direct connection threshold value, outputting a direct connection control signal to control the voltage of the input end to be directly output to the output end, and improving a feedback signal to enable the DC-DC conversion circuit to feed back too high to stop working; therefore, under the condition that the work of the DC-DC conversion circuit is not influenced, the DC-DC direct connection can be realized when the output voltage requirement is large, and the work efficiency of the system is improved; meanwhile, the system does not need to be bound with a specific protocol for use, and has a simple structure and low cost.
In order to better understand the technical solutions, the technical solutions will be described in detail below with reference to the drawings and the specific embodiments of the specification, and it should be understood that the embodiments and specific features of the embodiments of the present invention are detailed descriptions of the technical solutions of the present application, and are not limited to the technical solutions of the present application, and the technical features of the embodiments and examples of the present invention may be combined with each other without conflict.
Example one
The embodiment of the present invention provides a direct connection control device of a DC-DC conversion circuit, which is particularly suitable for electronic devices such as a PD power supply, an automatic adjustable power supply, or a protocol communication adjustable power supply, and the circuit includes, referring to fig. 1:
the device comprises an input module, a DC-DC conversion circuit and an output module, wherein the DC-DC conversion circuit is connected between the input module and the output module, and the device is characterized by further comprising a through control module, a constant current source voltage regulating signal extraction and conversion module and a protocol circuit, wherein the constant current source voltage regulating signal extraction and conversion module is connected with the through control module, the protocol circuit and the DC-DC conversion circuit, the protocol circuit is further connected with the output module, the through control module is further connected between the input module and the output module, and the protocol circuit converts the output voltage requirement of the output module into a constant current source voltage regulating signal and feeds the constant current source voltage regulating signal back to the constant current source voltage regulating signal extraction and conversion module; the constant current source voltage regulating signal extraction and conversion module generates a feedback signal according to the constant current source voltage regulating signal, the DC-DC conversion circuit is controlled to be in a through mode or a working mode through the feedback signal, the DC-DC conversion circuit is controlled to convert the voltage of the input module and then transmit the converted voltage to the output module through the feedback signal in the working mode, the DC-DC conversion circuit is controlled to stop conversion and transmit a through control signal to the through control module in the through mode, and the through control module transmits the voltage of the input module to the output module.
In this embodiment, referring to fig. 1, an input pin of the DC-DC conversion circuit is connected to the input module, and an output pin of the DC-DC conversion circuit is connected to the output module, and is used for performing DC-DC conversion on the input voltage and outputting the converted input voltage to the output module for use by a load. The input end of the protocol circuit is connected with the output module, the output end of the protocol circuit is connected with the constant current source voltage regulating signal extracting and converting module, when the load requirement changes, the protocol circuit converts the requirement into a constant current source voltage regulating signal and sends the constant current source voltage regulating signal to the constant current source voltage regulating signal extracting and converting module. The input end of the constant current source voltage regulating signal extraction and conversion module is connected with the protocol circuit, the output end of the constant current source voltage regulating signal extraction and conversion module is connected with the feedback pin of the DC-DC conversion circuit, after the constant current source voltage regulating signal from the protocol circuit is received, the constant current source voltage regulating signal is converted into the feedback signal and then is superposed on the feedback pin of the DC-DC conversion circuit to control the DC-DC conversion circuit to normally work or control the DC-DC conversion circuit to enter a direct connection mode after the constant current source voltage regulating signal exceeds a direct connection threshold value, namely, the input voltage is directly output to the output module through the direct connection control module instead of the DC-DC conversion circuit.
Specifically, in an embodiment of the present invention, the constant current source voltage regulating signal extracting and converting module includes a constant current source voltage regulating signal converting unit and a constant current source voltage regulating signal extracting unit, the constant current source voltage regulating signal converting unit is configured to convert a constant current source voltage regulating signal into a feedback signal, and transmit the feedback signal to a feedback pin of the DC-DC converting circuit to control the DC-DC converting circuit to convert the voltage of the input module and then transmit the converted voltage to the output module; the constant current source voltage regulating signal extraction unit is used for judging whether the feedback signal reaches a straight-through threshold value or not, and controlling the DC-DC conversion circuit to stop conversion and simultaneously sending a straight-through control signal to the straight-through control module through the feedback signal when the feedback signal reaches the straight-through threshold value.
Further, in an embodiment of the present invention, as shown in fig. 2, the constant current source voltage regulating signal converting unit includes a resistor R20, a resistor R16, a resistor R23, a resistor R11, a resistor R13, a resistor R18, a resistor R19, a resistor R24, a resistor R27, a triode Q3, a capacitor C5, and an adjustable precision voltage regulator IC1, the constant current source voltage regulating signal is connected to the control end of the adjustable precision voltage regulator IC1 and the first end of the resistor R24, the second end of the resistor R24 is grounded, and the anode of the adjustable precision voltage regulator IC1 is grounded via the resistor R27; the cathode of the adjustable precise voltage-stabilizing source IC1 is connected to the base electrode of the triode Q3 through a resistor R19; a first end of the resistor R11 is connected with an emitter of the triode Q3, a second end of the resistor R11 is connected with a first end of the resistor R18 and a first end of the resistor R13, and a second end of the resistor R13 is connected with a base of the triode Q3; the second end of the resistor R18 is connected with the first end of the capacitor C5 and the control end of the adjustable precise voltage-stabilizing source IC1, and the second end of the capacitor C5 is connected with the cathode of the adjustable precise voltage-stabilizing source IC 1; a first end of the resistor R20 is connected with a feedback pin of the DC-DC conversion circuit and a first end of the resistor R16, a second end of the resistor R20 is connected with a first end of the resistor R23, and a second end of the resistor R23 is grounded; the second end of the resistor R16 is connected to the output pin of the DC-DC conversion circuit. Constant current source voltage regulating signals from a protocol circuit are directly connected to a control pin of the IC1, R18 and R24 feed back output positive signals to the IC1, namely the constant current source voltage regulating signals are directly superposed on feedback quantity of the output positive signals of R18 and R24, and the variable quantity of a cathode of the IC1 is superposed on a feedback pin of the DC-DC conversion circuit through a constant current source voltage regulating signal extraction unit under the condition that the signals are overturned through R19, R13, R11 and Q3, so that the aim of directly controlling the feedback quantity of the DC-DC conversion circuit through the variable quantity of the IC1 is fulfilled. When the constant current source voltage regulating signal changes, the feedback quantity of the output signal superposed on R18 and R24 also changes, and at this time, the IC1 can automatically adjust the feedback quantity of the DC-DC conversion circuit to adjust the output positive voltage, so as to realize the effect of constant current source voltage regulating signal conversion, namely, the constant current source voltage regulating signal is converted into the feedback signal for controlling the DC-DC conversion circuit.
Further, in an embodiment of the present invention, as shown in fig. 2, the constant current source voltage regulating signal extracting unit includes a resistor R12, a resistor R14, a resistor R17, a resistor R21, a resistor R22, a resistor R25, a resistor R26, a capacitor C4, a diode D4, a zener diode ZD1, a zener diode ZD2, an adjustable precision voltage regulator IC2, and a field effect transistor Q4; a first end of the resistor R14 and a first end of the resistor R12 are connected to a collector of the triode Q3, and a second end of the resistor R14 is connected to a first end of the resistor R21 and a first end of the resistor R25; the second end of the resistor R21 is connected with the first end of the capacitor C4 and the control end of the adjustable precision voltage-stabilizing source IC 2; the second end of the resistor R25 is connected with the anode of the adjustable precision voltage-stabilizing source IC2 and the first end of the resistor R23; the second end of the resistor R12 is connected with the anode of the diode D4 and the cathode of the voltage stabilizing diode ZD2, the anode of the voltage stabilizing diode ZD2 is grounded, and the cathode of the diode D4 is connected with the second end of the capacitor C4, the cathode of the adjustable precise voltage stabilizing source IC2, the first end of the resistor R17 and the cathode of the voltage stabilizing diode ZD 1; the positive electrode of the voltage stabilizing diode ZD1 is connected with the first end of the resistor R22, the first end of the resistor R26 and the grid electrode of the field effect transistor Q4; the source electrode of the field effect transistor Q4 is connected with the anode of the adjustable precise voltage-stabilizing source IC1 and the second end of the resistor R26, and the drain electrode of the field effect transistor Q4 is connected with the direct connection control module; the second end of the resistor R22 is connected with the feedback pin of the DC-DC conversion circuit. As shown in fig. 2, R16 superimposes an offset and a high-frequency variation on the DC/DC feedback quantity, the higher the output voltage is, the larger the offset is, and when the offset is large to a certain extent, the feedback quantity from Q3 cannot adjust the DC/DC feedback quantity, so as to set the overvoltage protection threshold; meanwhile, the positive voltage high-frequency variation is output and quickly transmitted to the feedback quantity of the DC/DC through the R16, so that the loop is convenient to stabilize. The larger the feedback quantity from Q3 is, the larger the quantity of the divided voltage feedback of R14 and R25 to IC2 is, and when the quantity of the divided voltage feedback of R14 and R25 to IC2 is larger than a threshold value, IC2 is always conducted, so that Q4 is not conducted. The smaller the feedback quantity from the Q3 is, the smaller the feedback quantity of the R14 and R25 voltage division feedback to the IC2 is, when the feedback quantity of the R14 and R25 voltage division feedback to the IC2 is smaller than a threshold value, the IC2 is always not conducted, the 8.2V power supply is conducted with R17, ZD1 and R26 to enable Q4 to be conducted, and a control signal of R26 is superposed on a bias signal DC/DC feedback quantity through R22 to enable DC/DC to stop working.
Further, in an embodiment of the present invention, as shown in fig. 2, the pass-through control module includes a resistor R9, a resistor R10, and a field-effect transistor Q2, a gate of the field-effect transistor Q2 is connected to a first end of the resistor R9 and a first end of the resistor R10, a second end of the resistor R10 is connected to a drain of the field-effect transistor Q4, a source of the field-effect transistor Q2 is connected to a second end of the resistor R9 and an input pin of the DC-DC conversion circuit, and a drain of the field-effect transistor Q2 is connected to an output pin of the DC-DC conversion circuit. When the DC-DC conversion circuit enters a direct-through mode, Q4 is conducted, then Q2 is conducted, and the voltage of the input end is transmitted to the output end through Q2.
Example two
The present embodiment provides a through control method of a DC-DC conversion circuit, including:
the protocol circuit converts the output voltage requirement of the output module into a constant current source voltage regulating signal and feeds the constant current source voltage regulating signal back to the constant current source voltage regulating signal extraction and conversion module;
the constant current source voltage regulating signal extraction and conversion module generates a feedback signal according to the constant current source voltage regulating signal, controls the DC-DC conversion circuit to be in a direct-through mode or a working mode through the feedback signal,
the DC-DC conversion circuit is controlled to convert the voltage of the input module and send the converted voltage to the output module through the feedback signal in the working mode, the DC-DC conversion circuit is controlled to stop conversion and send a direct-connection control signal to the direct-connection control module in the direct-connection mode, and the direct-connection control module sends the voltage of the input module to the output module.
Specifically, in an embodiment of the present invention, the constant current source voltage regulating signal is converted into a feedback signal, and the feedback signal is transmitted to the feedback pin of the DC-DC conversion circuit to control the DC-DC conversion circuit to convert the voltage of the input module and then send the converted voltage to the output module; and judging whether the feedback signal reaches a through threshold value, and controlling the DC-DC conversion circuit to stop conversion and simultaneously sending a through control signal to the through control module through the feedback signal when the feedback signal reaches the through threshold value.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: rather, the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Moreover, those of skill in the art will appreciate that while some embodiments herein include some features included in other embodiments, not others, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention can be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
Claims (7)
1. A direct connection control device of a DC-DC conversion circuit comprises an input module, a DC-DC conversion circuit and an output module, wherein the DC-DC conversion circuit is connected between the input module and the output module, and the direct connection control device is characterized by further comprising a direct connection control module, a constant current source voltage regulating signal extraction and conversion module and a protocol circuit, wherein the constant current source voltage regulating signal extraction and conversion module is connected with the direct connection control module, the protocol circuit is further connected with the output module, the direct connection control module is further connected between the input module and the output module, and the protocol circuit converts an output voltage requirement of the output module into a constant current source voltage regulating signal and feeds the constant current source voltage regulating signal back to the constant current source voltage regulating signal extraction and conversion module; the constant current source voltage regulating signal extraction and conversion module generates a feedback signal according to the constant current source voltage regulating signal, the DC-DC conversion circuit is controlled to be in a direct connection mode or a working mode through the feedback signal, in the working mode, the DC-DC conversion circuit is controlled to convert the voltage of the input module and then send the converted voltage to the output module through the feedback signal, in the direct connection mode, the DC-DC conversion circuit is controlled to stop conversion and send a direct connection control signal to the direct connection control module, and the direct connection control module sends the voltage of the input module to the output module.
2. The apparatus as claimed in claim 1, wherein the constant current source regulator signal extracting and converting module includes a constant current source regulator signal converting unit and a constant current source regulator signal extracting unit, and the constant current source regulator signal converting unit is configured to convert the constant current source regulator signal into the feedback signal, and transmit the feedback signal to a feedback pin of the DC-DC converting circuit to control the DC-DC converting circuit to convert the voltage of the input module and transmit the converted voltage to the output module; the constant current source voltage regulating signal extraction unit is used for judging whether the feedback signal reaches the through threshold value or not, and controlling the DC-DC conversion circuit to stop conversion and simultaneously sending a through control signal to the through control module through the feedback signal when the feedback signal reaches the through threshold value.
3. The direct-through control device of the DC-DC conversion circuit according to claim 2, wherein the constant current source voltage regulating signal conversion unit comprises a resistor R20, a resistor R16, a resistor R23, a resistor R11, a resistor R13, a resistor R18, a resistor R19, a resistor R24, a resistor R27, a transistor Q3, a capacitor C5, and an adjustable precision voltage regulator IC1, the constant current source voltage regulating signal is connected to the control terminal of the adjustable precision voltage regulator IC1 and the first terminal of the resistor R24, the second terminal of the resistor R24 is grounded, and the anode of the adjustable precision voltage regulator IC1 is grounded via the resistor R27; the cathode of the adjustable precise voltage-stabilizing source IC1 is connected to the base electrode of the triode Q3 through a resistor R19; a first end of the resistor R11 is connected with an emitter of the triode Q3, a second end of the resistor R11 is connected with a first end of the resistor R18 and a first end of the resistor R13, and a second end of the resistor R13 is connected with a base of the triode Q3; the second end of the resistor R18 is connected with the first end of the capacitor C5 and the control end of the adjustable precision voltage-stabilizing source IC1, and the second end of the capacitor C5 is connected with the cathode of the adjustable precision voltage-stabilizing source IC 1; a first end of the resistor R20 is connected with a feedback pin of the DC-DC conversion circuit and a first end of the resistor R16, a second end of the resistor R20 is connected with a first end of the resistor R23, and a second end of the resistor R23 is grounded; the second end of the resistor R16 is connected to the output pin of the DC-DC conversion circuit.
4. The through control device of the DC-DC conversion circuit according to claim 3, wherein the constant current source voltage-regulating signal extracting unit includes a resistor R12, a resistor R14, a resistor R17, a resistor R21, a resistor R22, a resistor R25, a resistor R26, a capacitor C4, a diode D4, a zener diode ZD1, a zener diode ZD2, an adjustable precision regulator IC2, a field effect transistor Q4; a first end of the resistor R14 and a first end of the resistor R12 are connected to a collector of the triode Q3, and a second end of the resistor R14 is connected to a first end of the resistor R21 and a first end of the resistor R25; the second end of the resistor R21 is connected with the first end of the capacitor C4 and the control end of the adjustable precision voltage-stabilizing source IC 2; the second end of the resistor R25 is connected with the anode of the adjustable precise voltage-stabilizing source IC2 and the first end of the resistor R23; the second end of the resistor R12 is connected with the anode of the diode D4 and the cathode of the voltage stabilizing diode ZD2, the anode of the voltage stabilizing diode ZD2 is grounded, and the cathode of the diode D4 is connected with the second end of the capacitor C4, the cathode of the adjustable precise voltage stabilizing source IC2, the first end of the resistor R17 and the cathode of the voltage stabilizing diode ZD 1; the positive electrode of the voltage stabilizing diode ZD1 is connected with the first end of the resistor R22, the first end of the resistor R26 and the grid electrode of the field effect transistor Q4; the source electrode of the field effect transistor Q4 is connected with the anode of the adjustable precise voltage-stabilizing source IC1 and the second end of the resistor R26, and the drain electrode of the field effect transistor Q4 is connected with the direct connection control module; the second end of the resistor R22 is connected with the feedback pin of the DC-DC conversion circuit.
5. The device of claim 4, wherein the shoot-through control module comprises a resistor R9, a resistor R10 and a field effect transistor Q2, a gate of the field effect transistor Q2 is connected to a first terminal of the resistor R9 and a first terminal of the resistor R10, a second terminal of the resistor R10 is connected to a drain of the field effect transistor Q4, a source of the field effect transistor Q2 is connected to a second terminal of the resistor R9 and an input pin of the DC-DC conversion circuit, and a drain of the field effect transistor Q2 is connected to an output pin of the DC-DC conversion circuit.
6. A shoot-through control method of a DC-DC conversion circuit, using the shoot-through control device of the DC-DC conversion circuit according to any one of claims 1 to 5, comprising:
the protocol circuit converts the output voltage requirement of the output module into a constant current source voltage regulating signal and feeds the constant current source voltage regulating signal back to the constant current source voltage regulating signal extraction and conversion module;
the constant current source voltage regulating signal extraction and conversion module generates a feedback signal according to the constant current source voltage regulating signal, controls the DC-DC conversion circuit to be in a direct-through mode or a working mode through the feedback signal,
in the working mode, the DC-DC conversion circuit is controlled by the feedback signal to convert the voltage of an input module and then send the converted voltage to an output module, in the direct-connection mode, the DC-DC conversion circuit is controlled to stop conversion and send a direct-connection control signal to the direct-connection control module, and the direct-connection control module sends the voltage of the input module to the output module.
7. The method for controlling the shoot-through of the DC-DC conversion circuit according to claim 6, wherein the constant current source regulator signal extracting and converting module generates a feedback signal according to the constant current source regulator signal, and the step of controlling the DC-DC conversion circuit in the shoot-through mode or the operation mode by the feedback signal comprises:
converting the constant current source voltage regulating signal into the feedback signal, and transmitting the feedback signal to a feedback pin of the DC-DC conversion circuit to control the DC-DC conversion circuit to convert the voltage of the input module and then transmit the converted voltage to the output module;
and judging whether the feedback signal reaches the direct connection threshold value, and controlling the DC-DC conversion circuit to stop conversion and simultaneously sending a direct connection control signal to the direct connection control module through the feedback signal when the feedback signal reaches the direct connection threshold value.
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