CN218449861U - Boost control circuit and frequency conversion refrigerator driving circuit - Google Patents

Boost control circuit and frequency conversion refrigerator driving circuit Download PDF

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CN218449861U
CN218449861U CN202221223635.4U CN202221223635U CN218449861U CN 218449861 U CN218449861 U CN 218449861U CN 202221223635 U CN202221223635 U CN 202221223635U CN 218449861 U CN218449861 U CN 218449861U
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circuit
voltage
diode
boost
output
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陈志杰
蒋富贵
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Shenzhen Zhenbang Technology Co ltd
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Shenzhen Zhenbang Technology Co ltd
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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 utility model provides a boost control circuit and a variable frequency refrigerator driving circuit, which comprise a rectification circuit, a voltage division circuit, a boost circuit, a control module and a switch tube; the input end of the rectifying circuit is connected with the power supply circuit, and the output end of the rectifying circuit is respectively connected with the input end of the voltage division circuit and the input end of the booster circuit and used for outputting the rectified output voltage to the voltage division circuit and the booster circuit; the output end of the booster circuit is connected with the post-stage circuit and used for boosting the output voltage to obtain a boosted voltage and outputting the boosted voltage to the post-stage circuit; the output end of the voltage division circuit is connected with the input end of the control module and used for outputting the output voltage to the control module; the grid electrode of the switching tube is connected with the output of the control module, the drain electrode of the switching tube is connected with the booster circuit, and the source electrode of the switching tube is grounded; the control module maintains the duty ratio of the switching tube to be constant at a preset duty ratio so that the boosted voltage changes along with the change of the input voltage. The utility model discloses boost circuit's cost can be reduced.

Description

Boost control circuit and frequency conversion refrigerator drive circuit
Technical Field
The utility model relates to a frequency conversion refrigerator technical field, concretely relates to boost control circuit and frequency conversion refrigerator drive circuit.
Background
In the driving circuit of the inverter refrigerator, the used compressor has higher rated voltage and is suitable for the occasion with 220VAC input voltage. When the input voltage is a low voltage of 110VAC, the input voltage needs to be boosted in order to achieve an optimum driving effect. At present, a common boost control circuit comprises a voltage doubling circuit and a power factor correction circuit, but the two circuits need a larger electrolytic capacitor or inductor due to larger transmission energy, so that the circuit cost is higher, and meanwhile, a feedback circuit needs to be arranged on part of the voltage doubling circuit and the power factor correction circuit, so that the circuit cost is further increased.
SUMMERY OF THE UTILITY MODEL
The utility model provides a boost control circuit and frequency conversion refrigerator drive circuit can step up input voltage, and the required energy of circuit is less moreover, can simplify the circuit in order to practice thrift the cost.
In a first aspect, the present invention provides a boost control circuit, which includes a rectification circuit, a voltage division circuit, a boost circuit, a control module and a switch tube; the input end of the rectifying circuit is connected with the power supply circuit, and the output end of the rectifying circuit is respectively connected with the input end of the voltage division circuit and the input end of the voltage boosting circuit and used for outputting the rectified output voltage to the voltage division circuit and the voltage boosting circuit; the output end of the booster circuit is connected with the rear-stage circuit and used for boosting the output voltage to obtain a boosted voltage and outputting the boosted voltage to the rear-stage circuit; the output end of the voltage division circuit is connected with the input end of the control module and used for outputting the output voltage to the control module; the grid electrode of the switching tube is connected with the output of the control module, the drain electrode of the switching tube is connected with the booster circuit, and the source electrode of the switching tube is grounded; the control module maintains the duty ratio of the switching tube to be a preset duty ratio so that the boosted voltage changes along with the change of the input voltage.
Further, the rectifying circuit comprises a first diode, a second diode, a third diode and a fourth diode; the positive pole of the first diode and the negative pole of the second diode are both connected with one output end of the power supply circuit, the positive pole of the third diode and the negative pole of the fourth diode are both connected with the other output end of the power supply circuit, the negative pole of the first diode and the negative pole of the third diode are both connected with the boost circuit and the input end of the voltage division circuit, and the positive pole of the second diode and the positive pole of the fourth diode are both grounded.
Further, the voltage division circuit comprises a first resistor, a second resistor and a third resistor; one end of the first resistor is connected with the rectifying circuit, the other end of the first resistor is connected with one end of the second resistor, the other end of the second resistor is connected with one end of the third resistor and the input end of the control module respectively, and the other end of the third resistor is grounded.
Furthermore, the control module is an MCU, an input pin of the MCU is connected with the voltage division circuit, and an output pin of the MCU is connected with the grid electrode of the switch tube.
Further, the switch tube is an NMOS tube.
Further, the boost circuit comprises a first inductor and a first capacitor; one end of the first inductor is connected with the rectifying circuit, the other end of the first inductor is connected with the drain electrode of the switching tube and one end of the first capacitor respectively, and the other end of the first capacitor is grounded.
Furthermore, the boost circuit further comprises a fifth diode, wherein the anode of the fifth diode is connected with the first inductor, and the cathode of the fifth diode is respectively connected with the drain of the switching tube, the first capacitor and the rear-stage circuit.
Further, the first capacitor is a small-capacity capacitor, and the first inductor is a small-size inductor.
In a second aspect, the present invention further provides a driving circuit of a frequency conversion refrigerator, which comprises any one of the above-mentioned boost control circuit.
Furthermore, the power supply circuit is further included, the output end of the power supply circuit is connected with the input end of the boost control circuit, and the output end of the boost control circuit is connected with the rear-stage circuit.
The utility model discloses a boost control circuit and frequency conversion refrigerator drive circuit, on the one hand can step up output voltage through boost circuit in order to obtain the boost voltage who satisfies the circuit voltage demand of back stage, on the other hand, the duty cycle that can control the switch tube through control module keeps unchangeable for predetermineeing the duty cycle, and predetermine the duty cycle relevant with output voltage, output voltage is relevant with the electric wire netting, also the output voltage that boost voltage under can following different electric wires changes, and need not feedback circuit and control boost circuit, the circuit has been simplified, and the cost is saved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without any creative effort.
Fig. 1 is a schematic block diagram of a boost control circuit provided in an embodiment of the present invention;
fig. 2 is a circuit diagram of a boost control circuit provided by an embodiment of the present invention;
fig. 3 is a circuit diagram of a boost control circuit according to another embodiment of the present invention;
fig. 4 is a block diagram schematically illustrating a driving circuit of a variable frequency refrigerator according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should be further understood that the term "and/or" as used in the specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
In addition, the directional terms of the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", and the like, refer to the attached drawings and the direction of the usage of the product. Accordingly, the directional terminology is used for purposes of illustration and understanding, and is in no way intended to be limiting. Further, in the drawings, structures that are similar or identical are denoted by the same reference numerals.
Referring to fig. 1 to 4, fig. 1 shows a block diagram of a boost control circuit 200 provided by the present invention, fig. 2 is a circuit diagram of the boost control circuit 200, fig. 3 is a circuit diagram of the boost control circuit 200 provided by another embodiment, and fig. 4 shows a block diagram of a driving circuit of a frequency conversion refrigerator provided by the present invention. As shown in fig. 1, the boost control circuit 200 includes a rectifying circuit 10, a voltage dividing circuit 20, a boost circuit 30, a control module 40 and a switching tube Q1; the input end of the rectifying circuit 10 is connected to the power supply circuit 100, and the output end thereof is respectively connected to the input end of the voltage dividing circuit 20 and the input end of the voltage boosting circuit 30, so as to output the rectified output voltage to the voltage dividing circuit 20 and the voltage boosting circuit 30; the output end of the boosting circuit 30 is connected to the post-stage circuit 300, and is configured to boost the output voltage to obtain a boosted voltage, and output the boosted voltage to the post-stage circuit 300; the output end of the voltage dividing circuit 20 is connected with the input end of the control module 40, and is used for outputting the output voltage to the control module 40; the grid electrode of the switching tube Q1 is connected with the output of the control module 40, the drain electrode thereof is connected with the booster circuit 30, and the source electrode thereof is grounded; the control module 40 maintains the duty ratio of the switching tube Q1 to be a preset duty ratio so that the boosted voltage varies with the variation of the input voltage.
The rectifier circuit 10 is configured to rectify an ac voltage input from the power supply circuit 100 to obtain a dc output voltage, and output the rectified output voltage to the voltage divider circuit 20 and the voltage booster circuit 30. On one hand, the boost circuit 30 boosts the output voltage to obtain a boosted voltage, and the obtained boosted voltage meets the voltage requirement of the post-stage circuit 300, for example, if the rectified output voltage is 110V, the boosted voltage boosted by the boost circuit 30 is 220V, on the other hand, the voltage dividing circuit 20 divides the input voltage and outputs the divided voltage to the control module 40, and the control module 40 controls the duty ratio of the switching tube Q1 according to the output voltage to control the boosted voltage, wherein the switching tube Q1 may be specifically an NMOS tube, in another embodiment, the switching tube Q1 may also be an IGBT tube, a gate of the IGBT tube is connected with the control module 40, an emitter is connected with the boost circuit 30, and a collector is grounded. The preset duty ratio is a fixed value, and particularly, for the same power grid, the preset duty ratio is a fixed value, and the preset duty ratios under different power grids are different. For example, for region a, the preset duty cycle may be fixed at 0.5 when the grid output voltage is 110VAC, and for region B, the preset duty cycle may be fixed at 0.4 when the grid output voltage is 88 VAC. In various regions around the world, the low-voltage commercial power range generally changes within 110-120 VAC, the output voltage generally changes within 85-145 VAC considering that 20% of the grid voltage fluctuation exists, when the boost voltage is the voltage rectified by 220VAC, namely the boost voltage is 220V, the duty ratio generally ranges from 0.34 to 0.62 according to formula boost voltage = output voltage/(1-duty ratio), namely the value of the preset duty ratio ranges from 0.34 to 0.62, when the input voltage is determined, the preset duty ratio is also determined to be a fixed value, and different regions correspond to different preset duty ratios, so that the boost voltage is ensured to be 220VAC.
Referring to fig. 2, in an embodiment, the rectifying circuit 10 includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4; the anode of the first diode D1 and the cathode of the second diode D2 are both connected to an output terminal of the power circuit 100, the anode of the third diode D3 and the cathode of the fourth diode D4 are both connected to another output terminal of the power circuit 100, the cathode of the first diode D1 and the cathode of the third diode D3 are both connected to the boost circuit 30 and the input terminal of the voltage divider circuit 20, and the anode of the second diode D2 and the anode of the fourth diode D4 are both grounded.
In one embodiment, the voltage divider circuit 20 includes a first resistor R1, a second resistor R2, and a third resistor R3; one end of the first resistor R1 is connected to the rectifying circuit 10, the other end of the first resistor R1 is connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to one end of the third resistor R3 and the input end of the control module 40, and the other end of the third resistor R3 is grounded.
The first resistor R1, the second resistor R2, and the third resistor R3 are used for dividing the input voltage.
In an embodiment, the control module 40 is an MCU, an input pin of the MCU is connected to the voltage divider 20, and an output pin of the MCU is connected to a gate of the switching tube Q1.
The MCU is used for controlling the duty ratio of the switching tube Q1 to be kept unchanged, so that the boosted voltage can change along with the change of the input voltage.
In one embodiment, the voltage boost circuit 30 includes a first inductor L1 and a first capacitor C1; one end of the first inductor L1 is connected to the rectifying circuit 10, the other end of the first inductor L1 is connected to the drain of the switching tube Q1 and one end of the first capacitor C1, and the other end of the first capacitor C1 is grounded.
Referring to fig. 3, in a further embodiment, the voltage boost circuit 30 further includes a fifth diode D5, an anode of the fifth diode D5 is connected to the first inductor L1, and a cathode of the fifth diode D5 is connected to the drain of the switching tube, the first capacitor C1 and the post-stage circuit 300 respectively.
In a further embodiment, the first capacitor C1 is a small-capacity capacitor, and the first inductor L1 is a small-sized inductor.
The preset duty ratio can be different values according to different regions, so that the boosted voltage meets the requirement of a rear-stage circuit, the low-capacity first inductor L1 and the low-capacity first capacitor C1 can be arranged, and the circuit cost is saved. In addition, a first capacitor C1 and a switching tube Q1 are connected behind the first inductor L1, so that the boosted voltage can be controlled by the switching tube Q1.
Referring to fig. 4, the utility model also discloses a frequency conversion refrigerator drive circuit, it includes the boost control circuit 200 of any one of the above-mentioned.
Further, the power supply circuit 100 is further included, an output end of the power supply circuit 100 is connected with an input end of the boost control circuit 200, and an output end of the boost control circuit 200 is connected with the post-stage circuit 300.
The power supply circuit 100 supplies power to the post-stage circuit 300 through the boost control circuit 200, and the boost control circuit 200 is used for boosting the output voltage output by the power supply circuit 100 to meet the voltage requirement of the post-stage circuit 300, and can be applied to power grids in different regions.
The utility model discloses a boost control circuit and frequency conversion refrigerator drive circuit, thereby it obtains the boost voltage who satisfies the back level circuit demand to step up output voltage through boost circuit, the duty cycle of rethread control module control switch pipe, ensure that the duty cycle of switch pipe remains throughout for predetermineeing the duty cycle, and it is relevant with regional voltage to predetermine the duty cycle, thereby can be under the electric wire netting voltage of difference, all make boost voltage satisfy the voltage demand of back level circuit, and need not to set up feedback circuit, circuit transmission energy is less, the saving circuit cost.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A boost control circuit is applied to a drive circuit of a variable frequency refrigerator and is characterized in that the boost control circuit comprises a rectification circuit, a voltage division circuit, a boost circuit, a control module and a switch tube;
the input end of the rectifying circuit is connected with the power supply circuit, and the output end of the rectifying circuit is respectively connected with the input end of the voltage division circuit and the input end of the voltage boosting circuit and used for outputting the rectified output voltage to the voltage division circuit and the voltage boosting circuit;
the output end of the booster circuit is connected with the rear-stage circuit and used for boosting the output voltage to obtain a boosted voltage and outputting the boosted voltage to the rear-stage circuit;
the output end of the voltage division circuit is connected with the input end of the control module and used for outputting the output voltage to the control module;
the grid electrode of the switching tube is connected with the output of the control module, the drain electrode of the switching tube is connected with the booster circuit, and the source electrode of the switching tube is grounded;
the control module maintains the duty ratio of the switching tube to be a preset duty ratio so that the boosted voltage changes along with the change of the input voltage.
2. A boost control circuit according to claim 1, wherein said rectifying circuit includes a first diode, a second diode, a third diode, and a fourth diode;
the positive pole of the first diode and the negative pole of the second diode are both connected with one output end of the power supply circuit, the positive pole of the third diode and the negative pole of the fourth diode are both connected with the other output end of the power supply circuit, the negative pole of the first diode and the negative pole of the third diode are both connected with the boost circuit and the input end of the voltage division circuit, and the positive pole of the second diode and the positive pole of the fourth diode are both grounded.
3. A boost control circuit according to claim 1, wherein the voltage dividing circuit includes a first resistor, a second resistor, and a third resistor;
one end of the first resistor is connected with the rectifying circuit, the other end of the first resistor is connected with one end of the second resistor, the other end of the second resistor is respectively connected with one end of the third resistor and the input end of the control module, and the other end of the third resistor is grounded.
4. A boost control circuit according to claim 1, wherein the control module is an MCU, an input pin of the MCU is connected to the voltage divider circuit, and an output pin of the MCU is connected to a gate of the switching tube.
5. A boost control circuit according to claim 1, wherein said switching transistor is an NMOS transistor.
6. The boost control circuit of claim 1, wherein the boost circuit comprises a first inductor and a first capacitor;
one end of the first inductor is connected with the rectifying circuit, the other end of the first inductor is connected with the drain electrode of the switching tube and one end of the first capacitor respectively, and the other end of the first capacitor is grounded.
7. The boost control circuit of claim 6, wherein the boost circuit further comprises a fifth diode, an anode of the fifth diode is connected to the first inductor, and a cathode of the fifth diode is connected to the drain of the switching tube, the first capacitor, and the post-stage circuit, respectively.
8. A boost control circuit according to claim 6, in which the first capacitor is a small capacitance and the first inductor is a small size inductor.
9. A driving circuit of a variable frequency refrigerator, characterized by comprising the boost control circuit according to any one of claims 1 to 8.
10. The inverter refrigerator driving circuit according to claim 9, further comprising a power circuit, wherein an output terminal of the power circuit is connected to an input terminal of the boost control circuit, and an output terminal of the boost control circuit is connected to a subsequent circuit.
CN202221223635.4U 2022-05-20 2022-05-20 Boost control circuit and frequency conversion refrigerator driving circuit Active CN218449861U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202221223635.4U CN218449861U (en) 2022-05-20 2022-05-20 Boost control circuit and frequency conversion refrigerator driving circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202221223635.4U CN218449861U (en) 2022-05-20 2022-05-20 Boost control circuit and frequency conversion refrigerator driving circuit

Publications (1)

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CN218449861U true CN218449861U (en) 2023-02-03

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CN202221223635.4U Active CN218449861U (en) 2022-05-20 2022-05-20 Boost control circuit and frequency conversion refrigerator driving circuit

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