CN113839571A - Non-isolated voltage conversion circuit and conversion method and electronic equipment - Google Patents

Non-isolated voltage conversion circuit and conversion method and electronic equipment Download PDF

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Publication number
CN113839571A
CN113839571A CN202111143606.7A CN202111143606A CN113839571A CN 113839571 A CN113839571 A CN 113839571A CN 202111143606 A CN202111143606 A CN 202111143606A CN 113839571 A CN113839571 A CN 113839571A
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CN
China
Prior art keywords
voltage
circuit
detection circuit
alternating current
detection
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CN202111143606.7A
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Chinese (zh)
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谭瑞锋
胡燊刚
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Shenzhen Biyi Microelectronics Co Ltd
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Shenzhen Biyi Microelectronics Co Ltd
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Priority to CN202111143606.7A priority Critical patent/CN113839571A/en
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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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal 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
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal 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
    • H02M7/2176—Conversion of ac power input into dc power output without possibility of reversal 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 comprising a passive stage to generate a rectified sinusoidal voltage and a controlled switching element in series between such stage and the output

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

The invention relates to a non-isolated voltage conversion circuit, a conversion method and electronic equipment, comprising a non-isolated detection circuit, wherein the grounding end of the non-isolated detection circuit is used for being coupled with the ground, and the input end of the non-isolated detection circuit is used for being connected with an alternating current power supply, generating a zero-crossing detection signal according to the alternating current voltage of the alternating current power supply and generating a first voltage according to the alternating current voltage; and the input end of the control circuit is connected with the first output end of the non-isolation detection circuit, the output end of the control circuit is used for being connected with a load, and the control circuit generates output voltage according to the first voltage so as to supply power to the load. The ground end of the non-isolation detection circuit is coupled to the ground, so that the reference ground of the non-isolation detection circuit is the power ground, and the non-isolation detection circuit can generate a zero-crossing detection signal with the reference ground as the power ground according to the alternating-current voltage of the alternating-current power supply.

Description

Non-isolated voltage conversion circuit and conversion method and electronic equipment
Technical Field
The present invention relates to the field of electronic circuit technologies, and in particular, to a non-isolated voltage conversion circuit, a non-isolated voltage conversion method, and an electronic device.
Background
The voltage of the 220V ac power supply is constantly changing with time, and a reference point is required as a starting point in a control circuit for the purpose of voltage regulation, dimming, temperature regulation, speed regulation and device reliability enhancement, and the starting point is the moment when the voltage of the ac power supply is 0V. The zero-crossing detection is to send a zero-crossing signal to a post-control circuit when the alternating voltage is 0V, and the receiving end of the zero-crossing signal is generally a main control IC.
In order to meet the requirements of simplicity in design and collinear connection of thyristors, a floating-ground architecture is generally adopted in a typical household appliance non-isolated AC-DC voltage conversion system, that is, the reference ground potential of an IC in the non-isolated AC-DC voltage conversion system is changed and is not a true power ground, so that the non-isolated AC-DC voltage conversion system of the floating-ground architecture cannot output a zero-crossing signal which is referenced to the power ground.
Disclosure of Invention
Therefore, there is a need for a novel non-isolated voltage converting circuit, a converting method and an electronic device, which can achieve a zero-crossing signal with the output reference ground being the power ground.
A non-isolated voltage conversion circuit comprising:
the non-isolation detection circuit comprises a non-isolation detection circuit, a first voltage generation circuit and a second voltage generation circuit, wherein the grounding end of the non-isolation detection circuit is used for being coupled with the ground, and the input end of the non-isolation detection circuit is used for being connected with an alternating current power supply, generating a zero-crossing detection signal according to alternating current voltage of the alternating current power supply and generating a first voltage according to the alternating current voltage; and
the input end of the control circuit is connected with the first output end of the non-isolation detection circuit, the output end of the control circuit is used for being connected with a load, and the control circuit generates output voltage according to the first voltage so as to supply power to the load.
In one embodiment, the non-isolated detection circuit comprises:
the grounding end of the alternating current detection circuit is used for being coupled with the ground, and the first end of the alternating current detection circuit is the input end of the non-isolated detection circuit and is used for generating detection voltage according to the alternating current voltage;
the input end of the zero-crossing detection circuit is connected with the second end of the alternating current detection circuit and is used for generating the zero-crossing detection signal according to the detection voltage;
and a first end of the switch detection circuit is connected with a first end of the alternating current detection circuit, and a second end of the switch detection circuit is connected with a second end of the alternating current detection circuit and is used for generating the first voltage according to the detection voltage and the alternating current voltage.
In one embodiment, the ac detection circuit includes:
the first end of the voltage division module is the first end of the alternating current detection circuit, and the second end of the voltage division module is grounded and is used for dividing the alternating current voltage to obtain a voltage division signal;
and the first end of the voltage detection module is the second end of the alternating current detection circuit, and the second end of the voltage detection module is coupled with the third end of the voltage division module and is used for generating the detection voltage according to the voltage division signal.
In one embodiment, the voltage dividing module comprises a first resistor and a second resistor which are connected in series; one end of the first resistor is coupled to the second end of the voltage detection module and one end of the second resistor respectively, the other end of the first resistor is grounded, and the other end of the second resistor is coupled to an alternating current power supply.
In one embodiment, the zero-crossing detection circuit includes:
a third resistor, one end of the third resistor being coupled to the second end of the ac detection circuit;
one end of the fourth resistor is connected with a power supply voltage, and the other end of the fourth resistor is used for outputting the zero-crossing detection signal;
the control end of the first switch tube is connected with the other end of the third resistor, the first end of the first switch tube is connected with the other end of the fourth resistor, the second end of the first switch tube is grounded, and the first switch tube is used for generating the zero-crossing detection signal according to the detection voltage.
In one embodiment, the switch detection circuit includes: the circuit comprises a first driving circuit, a second switching tube and a first capacitor;
the first input end of the first driving circuit is the second end of the switch detection circuit, and the first end of the second switch tube is the first end of the switch detection circuit; the second input end of the first driving circuit is connected with the second end of the second switch tube, and the output end of the first driving circuit is connected with the control end of the second switch tube; one end of the first capacitor is connected with the second end of the second switch tube, and the other end of the first capacitor is grounded;
the first driving circuit is used for generating a first control signal according to the detection voltage and the first voltage, and the first control signal is used for controlling the second switching tube to be switched on and off;
the first capacitor is used for generating the first voltage according to the alternating voltage.
In one embodiment, the first driving circuit is configured to generate a first control signal for controlling the second switching tube to be turned on when the detection voltage is not greater than a first preset value and the first voltage is not greater than a second preset value.
In one embodiment, the second switch tube includes a PMOS transistor, a drain of the PMOS transistor is a first end of the second switch tube, and a source of the PMOS transistor is a second end of the second switch tube.
In one embodiment, the control circuit comprises: the second driving circuit, the third switching tube and the voltage generating module;
the input end of the second driving circuit is connected with the output end of the voltage generating module, the output end of the second driving circuit is connected with the control end of the third switching tube, the first end of the third switching tube is the input end of the control circuit, and the second end of the third switching tube is connected with the input end of the voltage generating module;
the second driving circuit is used for generating a second control signal according to the output voltage, and the second control signal is used for controlling the third switching tube to be switched on and off;
the voltage generation module is used for generating the output voltage according to the first voltage.
In one embodiment, the second driving circuit is configured to generate a second control signal for controlling the third switching tube to be turned on when the output voltage is smaller than a third preset value.
In one embodiment, the third switching tube includes a PMOS transistor, a drain of the PMOS transistor is a first end of the third switching tube, and a source of the PMOS transistor is a second end of the third switching tube.
In one embodiment, the voltage generation module includes:
a freewheeling diode, wherein the cathode of the freewheeling diode is connected with the second end of the third switching tube, and the anode of the freewheeling diode is grounded;
an inductor, one end of which is connected with the cathode of the freewheeling diode;
and one end of the output capacitor is the output end of the voltage generation module and is connected with the other end of the inductor, and the other end of the output capacitor is grounded.
In one embodiment, the non-isolated voltage converting circuit further comprises:
the input end of the rectifying circuit is used for being connected with an alternating current power supply, the output end of the rectifying circuit is used for being connected with the input end of the non-isolated detection circuit, the rectifying circuit is used for outputting a rectifying voltage according to the alternating current voltage, and the non-isolated detection circuit is further used for generating the zero-crossing detection signal and the first voltage according to the rectifying voltage.
An electronic device comprising a non-isolated voltage conversion circuit as claimed in any one of the preceding claims.
A non-isolated voltage conversion method based on a non-isolated voltage conversion circuit as claimed in any one of the preceding claims, the method comprising:
generating a zero-crossing detection signal according to the alternating voltage of the alternating current power supply;
generating a first voltage according to the alternating voltage;
an output voltage is generated according to the first voltage.
In the non-isolated voltage conversion circuit, the non-isolated voltage conversion method and the electronic device, the non-isolated voltage conversion circuit includes a non-isolated detection circuit, a ground terminal of the non-isolated detection circuit is used for being coupled to the ground, an input terminal of the non-isolated detection circuit is used for being connected with an alternating current power supply and generating a zero-crossing detection signal according to the alternating current voltage of the alternating current power supply, and also generating a first voltage according to the alternating current voltage, an input terminal of a control circuit is connected with a first output terminal of the non-isolated detection circuit, an output terminal of the control circuit is used for being connected with a load, and the control circuit generates an output voltage according to the first voltage to supply power to the load. The ground end of the non-isolation detection circuit is coupled to the ground, so that the reference ground of the non-isolation detection circuit is the power ground, and the non-isolation detection circuit can generate a zero-crossing detection signal with the reference ground as the power ground according to the alternating-current voltage of the alternating-current power supply.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a block diagram of a non-isolated voltage converting circuit according to an embodiment of the present invention;
FIG. 2 is a block diagram of a non-isolated voltage converting circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a non-isolated voltage converting circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a non-isolated voltage converting circuit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a non-isolated voltage converting circuit according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a non-isolated voltage converting circuit according to an embodiment of the present invention;
FIG. 7 is a schematic diagram illustrating the variation of the rectified voltage Vbus over time according to an embodiment;
FIG. 8 is a flowchart illustrating a non-isolated voltage conversion method according to an embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application 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 application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the present application. The first resistance and the second resistance are both resistances, but they are not the same resistance.
It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have communication of electrical signals or data with each other.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
Fig. 1 is a block diagram of a non-isolated voltage converting circuit in an embodiment, and as shown in fig. 1, in this embodiment, a non-isolated voltage converting circuit is provided, which includes: a non-isolated detection circuit 10 and a control circuit 20; the ground end of the non-isolated detection circuit 10 is used for coupling to the ground, the input end of the non-isolated detection circuit 10 is used for being connected with an alternating current power supply and generating a zero-crossing detection signal according to the alternating current voltage of the alternating current power supply, and the non-isolated detection circuit 10 is used for generating a first voltage according to the alternating current voltage; an input end of the control circuit 20 is connected with a first output end of the non-isolation detection circuit 10, an output end of the control circuit 20 is used for being connected with a load, and the control circuit 20 generates an output voltage according to the first voltage so as to supply power to the load.
The non-isolated voltage conversion circuit comprises a non-isolated detection circuit, wherein a grounding end of the non-isolated detection circuit is used for being coupled with the ground, an input end of the non-isolated detection circuit is used for being connected with an alternating current power supply and generating a zero-crossing detection signal according to the alternating current voltage of the alternating current power supply and generating a first voltage according to the alternating current voltage, an input end of a control circuit is connected with a first output end of the non-isolated detection circuit, an output end of the control circuit is used for being connected with a load, and the control circuit generates an output voltage according to the first voltage so as to supply power to the load. The grounding end of the non-isolation detection circuit is used for being coupled with the ground, so that the reference ground of the non-isolation detection circuit is the power ground, and further the non-isolation detection circuit can generate a zero-crossing detection signal with the reference ground being the power ground according to the alternating-current voltage of the alternating-current power supply.
Fig. 2 is a block diagram of a non-isolated voltage converting circuit in another embodiment, as shown in fig. 2, in one embodiment, the non-isolated detection circuit 10 includes: an alternating current detection circuit 102, a zero-crossing detection circuit 104, and a switch detection circuit 106; the grounding end of the ac detection circuit 102 is used for coupling to ground, and the first end of the ac detection circuit 102 is an input end of the non-isolated detection circuit 10 and is used for generating a detection voltage according to an ac voltage; the ground terminal of the zero-crossing detection circuit 104 is connected with the ground terminal of the alternating current detection circuit 102, and the input terminal of the zero-crossing detection circuit 104 is connected with the second terminal of the alternating current detection circuit 102 and is used for generating a zero-crossing detection signal according to the detection voltage; a first end of the switch detection circuit 106 is connected to a first end of the ac detection circuit 102, a second end of the switch detection circuit 106 is connected to a second end of the ac detection circuit 102, a third end of the switch detection circuit 106 is connected to the control circuit 20, and the switch detection circuit 106 is configured to generate a first voltage according to the detection voltage and the ac voltage.
Fig. 3 is a schematic structural diagram of a non-isolated voltage converting circuit in an embodiment, as shown in fig. 3, in one embodiment, the ac detecting circuit 102 includes: a voltage division module 1021 and a voltage detection module 1022; a first end of the voltage division module 1021 is a first end of the ac detection circuit 102, and a second end of the voltage division module 1021 is grounded and is configured to divide an ac voltage to obtain a divided voltage signal; the first terminal of the voltage detection module 1022 is the second terminal of the ac detection circuit 102, and the second terminal of the voltage detection module 1022 is coupled to the third terminal of the voltage division module 1021, and is configured to generate a detection voltage according to the divided voltage signal.
With continued reference to fig. 3, in one embodiment, the voltage divider module 1021 includes a first resistor R1 and a second resistor R2 connected in series; the common terminal of the first resistor R1 and the second resistor R2 is coupled to the second terminal of the voltage detection module 1022, the other terminal of the first resistor R1 is grounded, and the other terminal of the second resistor R2 is coupled to the ac power supply, that is, the common terminal of the first resistor R1 and the second resistor R2 is the third terminal of the voltage division module 1021, the other terminal of the first resistor R1 is the second terminal of the voltage division module 1021, and the other terminal of the second resistor R2 is the first terminal of the voltage division module 1021. In practical application, the resistance values of the first resistor R1 and the second resistor R2 are adjusted as required to obtain the required voltage division signal. In other embodiments, other devices may be coupled between the first resistor and the second resistor.
With continued reference to fig. 3, in one embodiment, the zero crossing detection circuit 104 includes: a third resistor R3, a fourth resistor R4 and a first switch tube M1; one end of the third resistor R3 is coupled to the second end of the ac detection circuit 102; one end of the fourth resistor R4 is connected with a power supply voltage, and the other end of the fourth resistor R4 is used for outputting a zero-crossing detection signal; the control end of the first switch tube M1 is connected with the other end of the third resistor R3, the first end of the first switch tube M1 is connected with the other end of the fourth resistor R4, the second end of the first switch tube M1 is grounded, and the first switch tube M1 is used for generating a zero-crossing detection signal according to the detection voltage. Illustratively, the first switch M1 includes an NPN transistor, where a base of the NPN transistor is the control terminal of the first switch M1, a collector of the NPN transistor is the first terminal of the first switch M1, and an emitter of the NPN transistor is the second terminal of the first switch M1.
With continued reference to fig. 3, in one embodiment, the zero crossing detection circuit 104 further comprises: one end of a fifth resistor R5, one end of a fifth resistor R5 is connected to the control end of the first switch transistor M1, and the other end of the fifth resistor R5 is connected to the second end of the first switch transistor M1, for example, the fifth resistor R5 and the fourth resistor R4 are of the same type.
Fig. 4 is a schematic structural diagram of a non-isolated voltage converting circuit in another embodiment, as shown in fig. 4, in one embodiment, the switch detecting circuit 106 includes: the first drive circuit 1061, the second switch tube M2, and the first capacitor C1; the first input end of the first driving circuit 1061 is the second end of the switch detection circuit 106, and the first end of the second switch tube M2 is the first end of the switch detection circuit 106; a second input end of the first driving circuit 1061 is connected to a second end of the second switch tube M2, and an output end of the first driving circuit 1061 is connected to a control end of the second switch tube M2; one end of the first capacitor C1 is connected to the second end of the second switch transistor M2, and the other end of the first capacitor C1 is grounded; the first driving circuit 1061 is configured to generate a first control signal according to the detection voltage and a first voltage, where the first control signal is used to control the second switching tube M2 to be turned on and off; the first capacitor C1 is used for generating the first voltage according to the ac voltage, and controls the conduction of the second switch tube M2 to the tube end to control the first voltage provided to the control circuit 20.
In one embodiment, the first driving circuit 1061 is configured to generate a first control signal for controlling the second switch M2 to turn on when the detected voltage is not greater than a first preset value and the first voltage is not greater than a second preset value, where the first preset value refers to a turn-on voltage corresponding to the second switch M2, and the second preset value refers to a voltage value of the corresponding first voltage when the output voltage is equal to the preset voltage.
In one embodiment, the second switch transistor M2 includes a PMOS transistor, a drain of the PMOS transistor is the first terminal of the second switch transistor M2, and a source of the PMOS transistor is the second terminal of the second switch transistor M2.
Fig. 5 is a schematic structural diagram of a non-isolated voltage converting circuit in an embodiment, as shown in fig. 5, in one embodiment, the control circuit 20 includes: the second driving circuit 202, the third switching tube M3 and the voltage generating module 204; the input end of the second driving circuit 202 is connected to the output end of the voltage generating module 204, the output end of the second driving circuit 202 is connected to the control end of the third switching tube M3, the first end of the third switching tube M3 is the input end of the control circuit 20, and the second end of the third switching tube M3 is connected to the input end of the voltage generating module 204; the second driving circuit 202 is configured to generate a second control signal according to the output voltage, where the second control signal is used to control the third switching tube M3 to turn on and off; the voltage generating module 204 is configured to generate an output voltage according to the first voltage, and the magnitude and fluctuation of the output voltage can be controlled by controlling the on and off of the third switching tube M3, so as to control the output voltage within a certain range.
With continued reference to fig. 5, in one embodiment, the second driving circuit 202 is configured to generate a second control signal for controlling the third switching tube to be turned on when the output voltage is less than a third preset value, where the third preset value refers to a minimum value of the required output voltage.
In one embodiment, the third switch M3 includes a PMOS transistor, the drain of the PMOS transistor is the first terminal of the third switch M3, and the source of the PMOS transistor is the second terminal of the third switch M3.
Fig. 6 is a schematic structural diagram of a non-isolated voltage converting circuit in another embodiment, as shown in fig. 6, in one embodiment, the voltage generating module 204 includes: a freewheeling diode D1, an inductor L and an output capacitor C2; the cathode of the freewheeling diode D1 is connected with the second end of the third switching tube M3, and the anode of the freewheeling diode D1 is grounded; one end of the inductor L is connected to the cathode of the freewheeling diode D1; one end of the output capacitor C2 is the output end of the voltage generation module 204, and is connected to the other end of the inductor L, and the other end of the output capacitor C2 is grounded.
With continued reference to fig. 6, in one embodiment, the non-isolated voltage conversion circuit further comprises: the rectifying circuit 30 has an input end for connecting to an ac power source, an output end for connecting to the input end of the non-isolation detection circuit 10, and the rectifying circuit 30 is configured to output a rectified voltage Vbus according to the ac voltage, that is, the second end (input end) of the voltage detection module 1022 receives a phase-converted dc signal (steamed bread wave), but the amplitude of the ac voltage can be synchronously detected. The non-isolated detection circuit 10 is further configured to generate a zero-crossing detection signal and a first voltage according to the rectified voltage Vbus. Illustratively, the rectifying circuit 30 includes a diode D2, wherein an anode of the diode D2 is connected to the ac power source, and a cathode of the diode D2 is connected to the input terminal of the non-isolated detection circuit 10.
Fig. 7 is a schematic diagram illustrating a change of the rectified voltage Vbus with time in an embodiment, and the following describes an operation process of the non-isolated voltage conversion circuit in the present application by taking fig. 6 and fig. 7 as an example, when the ac voltage is rectified by the diode D2 to obtain the rectified voltage Vbus, and the rectified voltage Vbus is divided by the first resistor R1 and the second resistor R2, the voltage detection module 1022 may detect a voltage division signal (input voltage signal), and output a non-isolated zero-crossing signal in a real-time bus voltage envelope acquired by the zero-crossing detection circuit 104, so that the system does not need high-voltage electrolysis after rectification, thereby further reducing the production cost; and meanwhile, the on-off of the second switching tube M2 can be controlled, when the rectified voltage Vbus is not more than the voltage V0, namely the rectified voltage Vbus is positioned at the valley bottom position, the second switching tube M2 is switched on, the source electrode of the second switching tube M2 is subjected to electrolytic filtering through an external first capacitor C1, a first voltage (intermediate voltage) is provided for the drain electrode of the third switching tube M3, the source electrode of the third switching tube M3 is connected with one end of an inductor L, and the other end of the inductor L is connected with the output capacitor C2 and provides direct-current output voltage for a load. Meanwhile, the second driving circuit 202 in the control circuit 20 collects the voltage value of the output voltage in real time to control the switching of the third switching tube M3. When the third switch transistor M3 is turned off, the current can also complete the freewheeling through the freewheeling diode D1, and form a BUCK circuit with the inductor L.
The application also provides an electronic device comprising the non-isolated voltage conversion circuit as described in any of the above.
Fig. 8 is a schematic flow chart of a non-isolated voltage conversion method in an embodiment, and as shown in fig. 8, the present application further provides a non-isolated voltage conversion method based on the voltage conversion circuit according to any one of the above descriptions, the method including:
and S102, generating a zero-crossing detection signal according to the alternating voltage of the alternating current power supply.
S104, generating a first voltage according to the alternating voltage.
And S106, generating an output voltage according to the first voltage.
In the non-isolated voltage conversion method, the non-isolated voltage conversion circuit includes a non-isolated detection circuit, a ground terminal of the non-isolated detection circuit is used for being coupled to the ground, an input terminal of the non-isolated detection circuit is used for being connected with an alternating current power supply and generating a zero-crossing detection signal according to the alternating current voltage of the alternating current power supply, and is also used for generating a first voltage according to the alternating current voltage, an input terminal of the control circuit is connected with a first output terminal of the non-isolated detection circuit, an output terminal of the control circuit is used for being connected with a load, and the control circuit generates an output voltage according to the first voltage to supply power to the load. The ground end of the non-isolation detection circuit is coupled to the ground, so that the reference ground of the non-isolation detection circuit is the power ground, and the non-isolation detection circuit can generate a zero-crossing detection signal with the reference ground as the power ground according to the alternating-current voltage of the alternating-current power supply.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (15)

1. A non-isolated voltage conversion circuit, comprising:
the non-isolation detection circuit comprises a non-isolation detection circuit, a first voltage generation circuit and a second voltage generation circuit, wherein the grounding end of the non-isolation detection circuit is used for being coupled with the ground, and the input end of the non-isolation detection circuit is used for being connected with an alternating current power supply, generating a zero-crossing detection signal according to alternating current voltage of the alternating current power supply and generating a first voltage according to the alternating current voltage; and
the input end of the control circuit is connected with the first output end of the non-isolation detection circuit, the output end of the control circuit is used for being connected with a load, and the control circuit generates output voltage according to the first voltage so as to supply power to the load.
2. The voltage conversion circuit of claim 1, wherein the non-isolated detection circuit comprises:
the grounding end of the alternating current detection circuit is used for being coupled with the ground, and the first end of the alternating current detection circuit is the input end of the non-isolated detection circuit and is used for generating detection voltage according to the alternating current voltage;
the input end of the zero-crossing detection circuit is connected with the second end of the alternating current detection circuit and is used for generating the zero-crossing detection signal according to the detection voltage;
and a first end of the switch detection circuit is connected with a first end of the alternating current detection circuit, and a second end of the switch detection circuit is connected with a second end of the alternating current detection circuit and is used for generating the first voltage according to the detection voltage and the alternating current voltage.
3. The voltage conversion circuit of claim 2, wherein the ac detection circuit comprises:
the first end of the voltage division module is the first end of the alternating current detection circuit, and the second end of the voltage division module is grounded and is used for dividing the alternating current voltage to obtain a voltage division signal;
and the first end of the voltage detection module is the second end of the alternating current detection circuit, and the second end of the voltage detection module is coupled with the third end of the voltage division module and is used for generating the detection voltage according to the voltage division signal.
4. The voltage conversion circuit of claim 3, wherein the voltage divider module comprises a first resistor and a second resistor connected in series; one end of the first resistor is coupled to the second end of the voltage detection module and one end of the second resistor respectively, the other end of the first resistor is grounded, and the other end of the second resistor is coupled to an alternating current power supply.
5. The voltage conversion circuit of claim 2, wherein the zero-crossing detection circuit comprises:
a third resistor, one end of the third resistor being coupled to the second end of the ac detection circuit;
one end of the fourth resistor is connected with a power supply voltage, and the other end of the fourth resistor is used for outputting the zero-crossing detection signal;
the control end of the first switch tube is connected with the other end of the third resistor, the first end of the first switch tube is connected with the other end of the fourth resistor, the second end of the first switch tube is grounded, and the first switch tube is used for generating the zero-crossing detection signal according to the detection voltage.
6. The voltage conversion circuit of claim 2, wherein the switch detection circuit comprises: the circuit comprises a first driving circuit, a second switching tube and a first capacitor;
the first input end of the first driving circuit is the second end of the switch detection circuit, and the first end of the second switch tube is the first end of the switch detection circuit; the second input end of the first driving circuit is connected with the second end of the second switch tube, and the output end of the first driving circuit is connected with the control end of the second switch tube; one end of the first capacitor is connected with the second end of the second switch tube, and the other end of the first capacitor is grounded;
the first driving circuit is used for generating a first control signal according to the detection voltage and the first voltage, and the first control signal is used for controlling the second switching tube to be switched on and off;
the first capacitor is used for generating the first voltage according to the alternating voltage.
7. The voltage conversion circuit of claim 6, wherein the first driving circuit is configured to generate a first control signal for controlling the second switch tube to conduct when the detected voltage is not greater than a first preset value and the first voltage is not greater than a second preset value.
8. The voltage conversion circuit of claim 6, wherein the second switch transistor comprises a PMOS transistor, a drain of the PMOS transistor is a first terminal of the second switch transistor, and a source of the PMOS transistor is a second terminal of the second switch transistor.
9. The voltage conversion circuit of claim 1, wherein the control circuit comprises: the second driving circuit, the third switching tube and the voltage generating module;
the input end of the second driving circuit is connected with the output end of the voltage generating module, the output end of the second driving circuit is connected with the control end of the third switching tube, the first end of the third switching tube is the input end of the control circuit, and the second end of the third switching tube is connected with the input end of the voltage generating module;
the second driving circuit is used for generating a second control signal according to the output voltage, and the second control signal is used for controlling the third switching tube to be switched on and off;
the voltage generation module is used for generating the output voltage according to the first voltage.
10. The voltage conversion circuit of claim 9, wherein the second driving circuit is configured to generate a second control signal for controlling the third switching tube to conduct when the output voltage is smaller than a third preset value.
11. The voltage conversion circuit of claim 9, wherein the third switch tube comprises a PMOS transistor, a drain of the PMOS transistor is a first end of the third switch tube, and a source of the PMOS transistor is a second end of the third switch tube.
12. The voltage conversion circuit of claim 9, wherein the voltage generation module comprises:
a freewheeling diode, wherein the cathode of the freewheeling diode is connected with the second end of the third switching tube, and the anode of the freewheeling diode is grounded;
an inductor, one end of which is connected with the cathode of the freewheeling diode;
and one end of the output capacitor is the output end of the voltage generation module and is connected with the other end of the inductor, and the other end of the output capacitor is grounded.
13. The voltage conversion circuit according to any one of claims 1 to 12, further comprising:
the input end of the rectifying circuit is used for being connected with an alternating current power supply, the output end of the rectifying circuit is used for being connected with the input end of the non-isolated detection circuit, the rectifying circuit is used for outputting a rectifying voltage according to the alternating current voltage, and the non-isolated detection circuit is further used for generating the zero-crossing detection signal and the first voltage according to the rectifying voltage.
14. An electronic device comprising the non-isolated voltage conversion circuit of any of claims 1-13.
15. A non-isolated voltage conversion method, wherein the method is based on a non-isolated voltage conversion circuit according to any of claims 1-13, the method comprising:
generating a zero-crossing detection signal according to the alternating voltage of the alternating current power supply;
generating a first voltage according to the alternating voltage;
an output voltage is generated according to the first voltage.
CN202111143606.7A 2021-09-28 2021-09-28 Non-isolated voltage conversion circuit and conversion method and electronic equipment Pending CN113839571A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111143606.7A CN113839571A (en) 2021-09-28 2021-09-28 Non-isolated voltage conversion circuit and conversion method and electronic equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111143606.7A CN113839571A (en) 2021-09-28 2021-09-28 Non-isolated voltage conversion circuit and conversion method and electronic equipment

Publications (1)

Publication Number Publication Date
CN113839571A true CN113839571A (en) 2021-12-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111143606.7A Pending CN113839571A (en) 2021-09-28 2021-09-28 Non-isolated voltage conversion circuit and conversion method and electronic equipment

Country Status (1)

Country Link
CN (1) CN113839571A (en)

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