BUCK circuit and electrical equipment

Abstract

The utility model provides a BUCK circuit and electrical equipment. The BUCK circuit provided by the utility model comprises a voltage transformation circuit module, the input end of which is connected with power supply current and is used for reducing the voltage of the power supply current; and the voltage screening module is connected with the output end of the voltage transformation circuit module, the voltage screening module comprises a relay, the relay is connected with a load, and the voltage screening module is used for carrying out voltage screening on the current passing through the voltage screening module and supplying power to the load. According to the utility model, passing current and voltage can be screened, so that output control is carried out when the voltage meets the requirement, the purpose of quick starting is achieved, and the influence on a post-stage load is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply circuits, in particular to a BUCK circuit and electrical equipment. Background Art

[0002] With the continuous development of buck power supply technology, the application rate of buck circuit in the home appliance industry is also increasing, aiming to convert the rectified high-voltage direct current into low-voltage direct current that can power loads such as main chips and relays. However, the output voltage Vout of the buck power supply takes a long time to build up, which often affects the normal operation of the subsequent load. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a BUCK circuit and electrical equipment, which can screen the current and voltage passing through, so that the output control is performed when the voltage meets the requirements, so as to achieve the purpose of fast startup and effectively reduce the impact on the subsequent load.

[0004] Therefore, the first object of the present invention is to provide a BUCK circuit.

[0005] The second purpose of the utility model is to provide an electrical device.

[0006] To achieve the first purpose of the utility model, the technical solution of the utility model provides a BUCK circuit, which includes: a transformer circuit module, the input end of the transformer circuit module is connected to the power supply current, and is used to reduce the voltage of the power supply current; a voltage screening module, the voltage screening module is connected to the output end of the transformer circuit module, the voltage screening module includes a relay, the relay is connected to the load, and the voltage screening module is used to perform voltage screening on the current passing through the voltage screening module and supply power to the load.

[0007] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: the BUCK circuit of the utility model is provided with a voltage screening module, through which the current and voltage passing through are screened, and the voltage screening module is specifically arranged to include a relay, and the circuit is controlled by electromagnetic action, so that the output control is performed only when the voltage meets the requirements, thereby achieving the purpose of rapid startup, and the working principle and connection method are simple, efficient and reliable, and the impact on the subsequent load is effectively reduced.

[0008] Furthermore, the pull-in voltage of the relay is 9V.

[0009] In the related art, the BUCK circuit steps down the power supply current. When the voltage drops to the working voltage, it can output the voltage to supply power to the load. However, the power supply current generally cannot change suddenly, which causes the current voltage provided to the load to rise from 0, increasing the start-up time of the load. It can be understood that the voltage screening module of the utility model is arranged between the output end of the transformer circuit module and the load, and the relay of the voltage screening module has a pull-in voltage. When the output voltage is greater than the pull-in voltage of 9V, the relay starts to work, and the load is supplied with power at this time, so as to reduce the output voltage establishment time and the impact on the normal operation of the subsequent load.

[0010] In a technical solution of the utility model, the transformer circuit module includes: a power chip, the power chip includes eight ports, the seventh port and the eighth port of the power chip are connected to the power current; a first electrolytic capacitor, the positive electrode of the first electrolytic capacitor is connected to the fourth port of the power chip, and the negative electrode of the first electrolytic capacitor is connected to the first port of the power chip; a first capacitor, and the first capacitor is connected in parallel with the first electrolytic capacitor.

[0011] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: the utility model adjusts the input power current through the power chip so that the output voltage maintains accuracy and stability; the first electrolytic capacitor and the first capacitor are filtered to ensure power supply stability and reduce noise.

[0012] In one technical solution of the utility model, the transformer circuit module includes: a second electrolytic capacitor, the positive electrode of the second electrolytic capacitor is connected to the fourth port of the power chip, and the negative electrode of the second electrolytic capacitor is connected to the first port of the power chip; a second capacitor, and the second capacitor is connected in parallel with the second electrolytic capacitor.

[0013] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: in the circuit of the utility model, the second electrolytic capacitor is set in parallel with the second capacitor for filtering, which further ensures the stability of the power supply and reduces noise. Specifically, the second electrolytic capacitor can store more charge, which is used to smooth the output voltage, reduce voltage fluctuations and noise, and the second capacitor uses the charging and discharging characteristics of the capacitor to smooth the voltage waveform. When the output voltage has spikes or glitches, the capacitor absorbs these excess energy and releases it when the voltage drops, thereby making the output voltage more stable.

[0014] In a technical solution of the utility model, the voltage conversion circuit module includes: a first diode, the anode of the first diode is connected to the anode of the second electrolytic capacitor, and the cathode of the first diode is connected to the fourth port of the power chip.

[0015] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: the first diode of the utility model is used to protect circuit elements and provide a freewheeling path for current, thereby further realizing energy transfer and filtering.

[0016] In a technical solution of the utility model, the voltage conversion circuit module includes: a second diode, the anode of the second diode is connected to the cathode of the second electrolytic capacitor, and the cathode of the second diode is connected to the first port of the power chip.

[0017] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: when the MOS tube is turned off, since the current in the inductor cannot change suddenly, the second diode provides a freewheeling loop, allowing the inductor to continue to supply power to the load. It has a faster reverse recovery time and can be quickly cut off before the MOS tube is turned on again, thereby reducing energy loss.

[0018] In a technical solution of the utility model, the voltage conversion circuit module includes: an inductor, one end of the inductor is connected to the positive electrode of the first diode, and the other end of the inductor is connected to the negative electrode of the second diode.

[0019] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: the utility model realizes the normal operation and energy storage of the circuit by setting the inductor in the first diode and the second diode. When the MOS tube is turned on, the inductor stores energy; when the MOS tube is turned off, the inductor releases energy to maintain the continuous flow of current. Secondly, the inductor also helps to smooth the output voltage and reduce ripple. This is because the inductor can resist the change of current. When the MOS tube is turned off, the inductor will maintain the current flowing to the load, and work with the output capacitor to reduce the fluctuation of the output voltage. In addition, the inductor also plays a role in ensuring that the circuit works stably under different load and input voltage conditions.

[0020] In a technical solution of the utility model, the BUCK circuit includes: a resistor, and the resistor is arranged between the voltage conversion circuit module and the relay.

[0021] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: in the utility model, by setting a resistor, the output voltage can be adjusted, current detection can be provided, and it can be used as a dummy load to test or stabilize the circuit.

[0022] In a technical solution of the present utility model, the BUCK circuit includes: a third capacitor, and the third capacitor is arranged between the relay and the load.

[0023] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: the utility model ensures the stability of the output voltage and improves the circuit's adaptability to load changes by setting a third capacitor between the relay and the load.

[0024] In one technical solution of the utility model, the relay includes four ports, the first port of the relay is connected to the output end of the transformer circuit module, the second port of the relay is grounded, the third port of the relay is connected to the positive pole of the load, and the fourth port of the relay is connected to the output end of the transformer circuit module.

[0025] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: the utility model specifically realizes the control of the circuit by electromagnetic action through the connection method between the relay and its ports and each electronic component. When the relay is working, the current generates electromagnetic attraction through its coil, controls the closing or opening of the third port and the fourth port, thereby changing the state of the circuit. The working principle and connection method are simple, efficient and reliable, and effectively reduce the impact on the subsequent load.

[0026] To achieve the second purpose of the utility model, the technical solution of the utility model provides an electrical device, which adopts any of the above-mentioned BUCK circuits.

[0027] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: the electrical equipment of this technical solution includes the BUCK circuit of any technical solution of the utility model, and thus has all the beneficial effects of the BUCK circuit of any technical solution of the utility model, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A BUCK circuit is provided in an embodiment of the utility model.

[0029] Description of reference numerals:

[0030] 100-BUCK circuit; 101-load; 102-resistance; 103-third capacitor; 110-voltage transformer circuit module; 111-power chip; 112-first electrolytic capacitor; 113-first capacitor; 114-second electrolytic capacitor; 115-second capacitor; 116-first diode; 117-second diode; 118-inductor; 120-voltage screening module; 121-relay. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific embodiments of the utility model are described in detail below in conjunction with the accompanying drawings. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict. In the following description, many specific details are set forth to facilitate a full understanding of the utility model, but the utility model can also be implemented in other ways different from those described herein, and therefore, the scope of protection of the utility model is not limited by the specific embodiments disclosed below.

[0032] Refer to the following Figure 1 The technical solutions of some embodiments of the utility model are described.

[0033] Reference Figure 1 As shown, an embodiment of the utility model provides a BUCK circuit, and the BUCK circuit 100 includes: a transformer circuit module 110, the input end of the transformer circuit module 110 is connected to the power supply current, and is used to reduce the voltage of the power supply current; a voltage screening module 120, the voltage screening module 120 is connected to the output end of the transformer circuit module 110, the voltage screening module 120 includes a relay 121, the relay 121 is connected to the load 101, and the voltage screening module 120 is used to perform voltage screening on the current passing through the voltage screening module 120 and supply power to the load 101.

[0034] The utility model BUCK circuit is provided with a voltage screening module, through which the current and voltage passing through are screened, and the voltage screening module is specifically arranged to include a relay, and the circuit is controlled through electromagnetic action, so that the output control is performed when the voltage meets the requirements, so as to achieve the purpose of rapid startup, and the working principle and connection method are simple, efficient and reliable, and the influence on the subsequent load is effectively reduced.

[0035] For example, the pull-in voltage of the relay 121 is 9V.

[0036] In the related art, the BUCK circuit steps down the power supply current. When the voltage drops to the working voltage, it can output the voltage to supply power to the load. However, the power supply current generally cannot change suddenly, which causes the current voltage provided to the load to rise from 0, increasing the start-up time of the load. It can be understood that the voltage screening module of the utility model is arranged between the output end of the transformer circuit module and the load, and the relay of the voltage screening module has a pull-in voltage. When the output voltage is greater than the pull-in voltage of 9V, the relay starts to work, and the load is supplied with power at this time, so as to reduce the output voltage establishment time and the impact on the normal operation of the subsequent load.

[0037] In some implementations of the embodiments of the present application, specifically, the transformer circuit module 110 includes: a power chip 111, the power chip 111 includes eight ports, the seventh port and the eighth port of the power chip 111 are connected to the power current; a first electrolytic capacitor 112, the positive electrode of the first electrolytic capacitor 112 is connected to the fourth port of the power chip 111, and the negative electrode of the first electrolytic capacitor 112 is connected to the first port of the power chip 111; a first capacitor 113, and the first capacitor 113 is connected in parallel with the first electrolytic capacitor 112.

[0038] The utility model adjusts the input power supply current through the power supply chip so that the output voltage maintains accuracy and stability; the first electrolytic capacitor and the first capacitor are filtered to ensure power supply stability and reduce noise.

[0039] In some implementations of the embodiments of the present application, specifically, the transformer circuit module 110 includes: a second electrolytic capacitor 114, the positive electrode of the second electrolytic capacitor 114 is connected to the fourth port of the power chip 111, and the negative electrode of the second electrolytic capacitor 114 is connected to the first port of the power chip 111; a second capacitor 115, and the second capacitor 115 is connected in parallel with the second electrolytic capacitor 114.

[0040] In the utility model circuit, the second electrolytic capacitor is set in parallel with the second capacitor for filtering, which further ensures the stability of the power supply and reduces noise. Specifically, the second electrolytic capacitor can store more charge, which is used to smooth the output voltage, reduce voltage fluctuations and noise, and the second capacitor uses the charge and discharge characteristics of the capacitor to smooth the voltage waveform. When the output voltage has spikes or glitches, the capacitor absorbs these excess energy and releases it when the voltage drops, so that the output voltage is more stable.

[0041] In some implementations of the embodiments of the present application, specifically, the transformer circuit module 110 includes: a first diode 116 , the anode of the first diode 116 is connected to the anode of the second electrolytic capacitor 114 , and the cathode of the first diode 116 is connected to the fourth port of the power chip 111 .

[0042] The first diode of the utility model is used to protect circuit elements and provide a freewheeling path for current, thereby further realizing energy transfer and filtering.

[0043] In some implementations of the embodiments of the present application, specifically, the transformer circuit module 110 includes: a second diode 117 , the anode of the second diode 117 is connected to the cathode of the second electrolytic capacitor 114 , and the cathode of the second diode 117 is connected to the first port of the power chip 111 .

[0044] When the MOS tube is turned off, the current in the inductor cannot change suddenly, so the second diode provides a freewheeling loop, allowing the inductor to continue to supply power to the load. The inductor has a faster reverse recovery time and can be quickly cut off before the MOS tube is turned on again, thereby reducing energy loss.

[0045] In some implementations of the embodiments of the present application, specifically, the transformer circuit module 110 includes: an inductor 118 , one end of the inductor 118 is connected to the anode of the first diode 116 , and the other end of the inductor 118 is connected to the cathode of the second diode 117 .

[0046] The utility model realizes the normal operation and energy storage of the circuit by setting the inductor between the first diode and the second diode. When the MOS tube is turned on, the inductor stores energy; when the MOS tube is turned off, the inductor releases energy to maintain the continuous flow of current. Secondly, the inductor also helps to smooth the output voltage and reduce ripple. This is because the inductor can resist the change of current. When the MOS tube is turned off, the inductor will maintain the current flowing to the load, and work with the output capacitor to reduce the fluctuation of the output voltage. In addition, the inductor also plays a role in ensuring that the circuit works stably under different load and input voltage conditions.

[0047] In some implementations of the embodiments of the present application, specifically, the BUCK circuit 100 includes: a resistor 102 , and the resistor 102 is arranged between the voltage conversion circuit module 110 and the relay 121 .

[0048] In the utility model, by setting the resistor, the output voltage can be adjusted, current detection can be provided, and the device can be used as a dummy load to test or stabilize the circuit.

[0049] In some implementations of the embodiments of the present application, specifically, the BUCK circuit 100 includes: a third capacitor 103 , and the third capacitor 103 is arranged between the relay 121 and the load 101 .

[0050] The utility model ensures the stability of the output voltage and improves the adaptability of the circuit to load changes by arranging the third capacitor between the relay and the load.

[0051] In some implementation schemes of the embodiments of the present application, specifically, the relay 121 includes four ports, the first port of the relay 121 is connected to the output end of the transformer circuit module 110, the second port of the relay 121 is grounded, the third port of the relay 121 is connected to the positive pole of the load 101, and the fourth port of the relay 121 is connected to the output end of the transformer circuit module 110.

[0052] The utility model specifically realizes the control of the circuit by electromagnetic action through the connection method of the relay and its ports with each electronic component. When the relay is working, the current generates electromagnetic attraction through its coil to control the closing or opening of the third port and the fourth port, thereby changing the state of the circuit. The working principle and connection method are simple, efficient and reliable, and effectively reduce the impact on the subsequent load.

[0053] In some implementations of the embodiments of the present application, the embodiments of the present utility model provide an electrical device that adopts any of the above-mentioned BUCK circuits.

[0054] The electrical device of this embodiment includes the BUCK circuit of any embodiment of the present utility model, and thus has all the beneficial effects of the BUCK circuit of any embodiment of the present utility model, which will not be described in detail here.

[0055] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0056] Although the utility model is disclosed as above, the utility model is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model. Therefore, the protection scope of the utility model shall be subject to the scope defined by the claims.

Claims

1. A BUCK circuit, characterized in that: The BUCK circuit (100) comprises: A voltage conversion circuit module (110), the input end of the voltage conversion circuit module (110) being connected to a power supply current and used for reducing the voltage of the power supply current; A voltage screening module (120), the voltage screening module (120) being connected to the output end of the voltage transformation circuit module (110), the voltage screening module (120) comprising a relay (121), the relay (121) being connected to a load (101), the voltage screening module (120) being used to perform voltage screening on a current passing through the voltage screening module (120) and to supply power to the load (101).

2. The BUCK circuit according to claim 1, characterized in that: The voltage conversion circuit module (110) comprises: A power chip (111), the power chip (111) comprising eight ports, a seventh port and an eighth port of the power chip (111) being connected to the power current; a first electrolytic capacitor (112), wherein a positive electrode of the first electrolytic capacitor (112) is connected to the fourth port of the power chip (111), and a negative electrode of the first electrolytic capacitor (112) is connected to the first port of the power chip (111); A first capacitor (113), wherein the first capacitor (113) is connected in parallel with the first electrolytic capacitor (112).

3. The BUCK circuit according to claim 2, characterized in that: The voltage conversion circuit module (110) comprises: a second electrolytic capacitor (114), wherein a positive electrode of the second electrolytic capacitor (114) is connected to the fourth port of the power chip (111), and a negative electrode of the second electrolytic capacitor (114) is connected to the first port of the power chip (111); A second capacitor (115), wherein the second capacitor (115) is connected in parallel with the second electrolytic capacitor (114).

4. The BUCK circuit according to claim 3, characterized in that: The voltage conversion circuit module (110) comprises: A first diode (116), wherein an anode of the first diode (116) is connected to an anode of the second electrolytic capacitor (114), and a cathode of the first diode (116) is connected to a fourth port of the power chip (111).

5. The BUCK circuit according to claim 4, characterized in that: The voltage conversion circuit module (110) comprises: A second diode (117), wherein the anode of the second diode (117) is connected to the cathode of the second electrolytic capacitor (114), and the cathode of the second diode (117) is connected to the first port of the power chip (111).

6. The BUCK circuit according to claim 5, characterized in that: The voltage conversion circuit module (110) comprises: An inductor (118), one end of the inductor (118) is connected to the anode of the first diode (116), and the other end of the inductor (118) is connected to the cathode of the second diode (117).

7. The BUCK circuit according to claim 1, characterized in that: The BUCK circuit (100) comprises: A resistor (102), wherein the resistor (102) is arranged between the voltage conversion circuit module (110) and the relay (121).

8. The BUCK circuit according to claim 1, characterized in that: The BUCK circuit (100) comprises: A third capacitor (103), wherein the third capacitor (103) is arranged between the relay (121) and the load (101).

9. The BUCK circuit according to any one of claims 1 to 8, characterized in that: The relay (121) comprises four ports, a first port of the relay (121) is connected to the output end of the voltage conversion circuit module (110), a second port of the relay (121) is grounded, a third port of the relay (121) is connected to the positive electrode of the load (101), and a fourth port of the relay (121) is connected to the output end of the voltage conversion circuit module (110).

10. An electrical device, characterized in that: The method comprises the BUCK circuit according to any one of claims 1 to 9.

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