CN220421638U - Voltage conversion circuit and electronic equipment - Google Patents
Voltage conversion circuit and electronic equipment Download PDFInfo
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- CN220421638U CN220421638U CN202320981091.6U CN202320981091U CN220421638U CN 220421638 U CN220421638 U CN 220421638U CN 202320981091 U CN202320981091 U CN 202320981091U CN 220421638 U CN220421638 U CN 220421638U
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Abstract
The application discloses a voltage conversion circuit and electronic equipment. The voltage conversion circuit comprises a switch branch, a transformer, a first signal processing branch and a controller, wherein the transformer comprises a primary winding and a secondary winding. The switch branch is connected with the primary winding, the primary winding is connected with the alternating current power supply, the secondary winding is connected with the first signal processing branch, and the first signal processing branch is connected with the secondary winding and the controller. The switching legs are configured to alternately turn on and off. The transformer is configured such that when the switching leg is on, the primary winding is charged and a first voltage is generated at the secondary winding. The first signal processing branch is configured to rectify and filter the first voltage and output a second voltage to the controller to cause the controller to determine a voltage of the ac power source based on the second voltage. Through the mode, the voltage detection of the alternating current power supply can be realized through one secondary winding, and the cost is low.
Description
Technical Field
The present disclosure relates to electronic circuits, and particularly to a voltage conversion circuit and an electronic device.
Background
In order to meet the power supply requirement of the electronic equipment without components, a corresponding voltage conversion circuit is required to convert the voltage of the input alternating current power supply into the voltage required by each component. Among them, a transformer is generally disposed in the existing voltage conversion circuit to realize voltage conversion.
In addition, when the electronic device is operated, the voltage of the input ac power supply needs to be monitored at all times to ensure that the electronic device can stably operate. Currently, for a voltage conversion circuit provided with a transformer, an additional winding is generally required to be provided to realize voltage detection of an ac power supply.
However, this detection requires the addition of an additional secondary winding, resulting in increased costs.
Disclosure of Invention
The application aims to provide a voltage conversion circuit and electronic equipment, and the voltage detection of an alternating current power supply can be realized through a secondary winding, so that the cost is low.
To achieve the above object, in a first aspect, the present application provides a voltage conversion circuit, including:
the transformer comprises a primary winding and a secondary winding;
the first end of the switch branch is connected with the homonymous end of the primary winding, the heteronymous end of the primary winding is connected with an alternating current power supply, the heteronymous end of the secondary winding is connected with the first end of the first signal processing branch, the second end of the first signal processing branch is connected with the homonymous end of the secondary winding, and the third end of the first signal processing branch is connected with the controller;
the switch branch is configured to be alternately turned on and off;
the transformer is configured such that when the switching leg is on, the primary winding is charged and a first voltage is generated at the secondary winding;
the first signal processing branch is configured to rectify and filter the first voltage and output a second voltage to the controller to cause the controller to determine a voltage of the ac power source based on the second voltage.
In an alternative way, the voltage conversion circuit further comprises a second signal processing branch;
the first end of the second signal processing branch is connected with the third end of the first signal processing branch, and the second end of the second signal processing branch is connected with the controller;
the second signal processing branch is configured to divide and filter the second voltage and output a third voltage to the controller, so that the controller determines the voltage of the alternating current power supply based on the third voltage.
In an alternative way, the voltage conversion circuit further comprises a third signal processing branch;
the first end of the third signal processing branch is connected with the synonym end of the secondary winding, and the second end of the third signal processing branch is respectively connected with the synonym end of the secondary winding and the load;
the transformer is further configured such that when the switching leg turns off, the primary winding stops charging and the secondary winding outputs a fourth voltage;
the third signal processing branch is configured to rectify and filter the fourth voltage to provide a supply voltage for the load.
In an alternative manner, the first signal processing branch includes a first diode, a first resistor and a first capacitor;
the anode of the first diode is connected with the synonym end of the secondary winding, the cathode of the first diode is connected with the first end of the first resistor, the second end of the first resistor is respectively connected with the first end of the first capacitor and the controller, and the second end of the first capacitor is connected with the synonym end of the secondary winding.
In an alternative manner, the second signal processing branch includes a second resistor, a third resistor, and a second capacitor;
the first end of the second resistor is connected with the third end of the first signal processing branch, the second end of the second resistor is respectively connected with the first end of the third resistor, the first end of the first capacitor and the controller, and the second end of the third resistor and the second end of the first capacitor are grounded.
In an alternative manner, the second signal processing branch includes a third capacitor, a fourth capacitor, a second diode, and a fourth resistor;
the first end of the third capacitor is respectively connected with the same-name end of the secondary winding and the load, the second end of the third capacitor and the first end of the fourth resistor are grounded, the second end of the fourth resistor is connected with the first end of the fourth capacitor, and the second end of the fourth capacitor is respectively connected with the cathode of the second diode and the different-name end of the secondary winding.
In an alternative manner, the voltage conversion circuit further comprises a fourth signal processing branch, a clamping branch and a switch control branch;
the first end and the second end of the fourth signal processing branch are respectively connected with the first end and the second end of the alternating current power supply, the third end of the fourth signal processing branch is respectively connected with the first end of the clamping branch and the synonym end of the primary winding, the second end of the clamping branch is respectively connected with the homonym end of the primary winding and the first end of the switching branch, and the first end of the switching control branch is connected with the second end of the switching branch;
the fourth signal processing branch is configured to rectify and filter the alternating current power supply to provide a charging voltage for the primary winding when the switch branch is turned on;
the clamping branch is configured to clamp the voltage across the primary winding to a first voltage threshold when the voltage across the primary winding is greater than the first voltage threshold;
the switch control branch is configured to output a pulse width modulation signal to the switch branch to control the switch branch to be alternately turned on and off.
In an alternative way, the switching branch comprises a first switching tube;
the first end of the first switching tube is connected with the first end of the switch control branch, the second end of the first switching tube is connected with the homonymous end of the primary winding, and the third end of the first switching tube is grounded.
In a second aspect, the present application provides an electronic device comprising a voltage conversion circuit as described above.
In an alternative, the electronic device is a bathroom device.
The beneficial effects of this application are: the voltage conversion circuit comprises a switch branch, a transformer, a first signal processing branch and a controller. The transformer comprises a primary winding and a secondary winding. Wherein the switching branches are configured to alternately turn on and off. And when the switch branch is conducted, the primary winding of the transformer is charged, and a first voltage is generated at the secondary winding of the transformer. The first voltage is rectified and filtered by the first signal processing branch circuit to be a second voltage. The second voltage is input to the controller. The controller determines a voltage of the ac power source based on the second voltage. Through the process, the voltage detection of the alternating current power supply through one secondary winding is realized. The cost is lower than the solution in the related art that requires the addition of the secondary winding.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.
Fig. 1 is a schematic diagram of a voltage conversion circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a voltage conversion circuit according to another embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a voltage conversion circuit according to another embodiment of the present disclosure;
fig. 4 is a schematic circuit diagram of a voltage conversion circuit according to an embodiment of the present application.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a voltage conversion circuit according to an embodiment of the present disclosure. As shown in fig. 1, the voltage conversion circuit 100 includes a switching branch 10, a transformer 20, a first signal processing branch 30, and a controller 40. The transformer 20 includes a primary winding L1 and a secondary winding L2.
The first end of the switch branch 10 is connected to the homonymous end of the primary winding L1, the heteronymous end of the primary winding L1 is connected to the ac power source 200, the heteronymous end of the secondary winding L2 is connected to the first end of the first signal processing branch 30, the second end of the first signal processing branch 30 is connected to the homonymous end of the secondary winding L2, and the third end of the first signal processing branch 30 is connected to the controller 40.
Among them, the controller 40 may employ a micro control unit (Microcontroller Unit, MCU) or the like.
Specifically, the switching leg 10 is configured to be alternately turned on and off. The transformer 20 is configured such that when the switching leg 10 is turned on, the primary winding L1 is charged and a first voltage is generated at the secondary winding L2. The first signal 30 is in a branch configured to rectify and filter the first voltage and output a second voltage to the controller 40 such that the controller 40 determines the voltage of the ac power source 200 based on the second voltage.
In practice, when the switching leg 10 is turned on, the primary winding L1 of the transformer 20 is charged. Then, based on the principle of electromagnetic induction, the secondary winding L2 of the transformer 20 can generate induced electromotive force. The induced electromotive force is the first voltage. The first voltage is rectified and filtered by the first signal processing branch 30 to be a second voltage. The second voltage is input to the controller 40. The controller 40 may determine the voltage of the ac power source 200 based on the second voltage. Through the above-described process, the voltage detection of the ac power supply 200 by one secondary winding L2 is realized. The cost is lower than the solution in the related art that requires the addition of the secondary winding.
In one embodiment, as shown in fig. 2, the voltage conversion circuit 100 further includes a second signal processing branch 50.
Wherein, the first end of the second signal processing branch 50 is connected to the third end of the first signal processing branch 30, and the second end of the second signal processing branch 50 is connected to the controller.
In this embodiment, the second signal processing branch 50 is configured to divide and filter the second voltage and output a third voltage to the controller 40, so that the controller 40 determines the voltage of the ac power source 200 based on the third voltage. By dividing the second voltage, the voltage input to the controller 40 can be made to meet the voltage requirement of the controller 40 to prevent the controller 40 from being damaged due to the excessive voltage input to the controller 40.
In an embodiment, referring to fig. 2, the voltage conversion circuit 100 further includes a third signal processing branch 60.
The first end of the third signal processing branch 60 is connected to the synonym end of the secondary winding L2, and the second end of the third signal processing branch 60 is connected to the synonym end of the secondary winding L2 and the load 300, respectively.
Specifically, the transformer 20 is further configured such that when the switching leg 20 is turned off, the primary winding L1 stops charging, and the secondary winding L2 outputs a fourth voltage. The third signal processing branch 60 is configured to rectify and filter the fourth voltage to provide a supply voltage for the load 300.
In practical applications, when the switching leg 10 is opened, the circuit for charging the primary winding L1 is opened, and the primary winding L1 stops being charged. At the same time, secondary winding L2 releases the energy stored in transformer 20. Then, a fourth voltage is output from the secondary winding L2. The fourth voltage is rectified and filtered to power the load 300.
In the related art, the process of supplying power to the load and the process of detecting the voltage of the ac power supply need to be implemented by one secondary winding, respectively, that is, two secondary windings in total are required. In the present application, the process of supplying power to the load and the process of detecting the voltage of the ac power supply can be simultaneously realized by only using the secondary winding L2, which is a secondary winding, and the cost required in the embodiments of the present application is lower.
It should be noted that the hardware configuration of the voltage conversion circuit 100 as shown in fig. 2 is only one example, and the voltage conversion circuit 100 may have more or fewer components than shown in the drawing, may combine two or more components, or may have different component configurations, and various components shown in the drawing may be implemented in hardware, software, or a combination of hardware and software including one or more signal processing and/or application specific integrated circuits.
For example, as shown in fig. 3, the voltage conversion circuit 100 further includes a fourth signal processing branch 70, a clamping branch 80, and a switch control branch 90.
The first end and the second end of the fourth signal processing branch 70 are respectively connected with the first end and the second end of the ac power supply 200, the third end of the fourth signal processing branch 70 is respectively connected with the first end of the clamping branch 80 and the heteronymous end of the primary winding L1, the second end of the clamping branch 80 is respectively connected with the homonymous end of the primary winding L1 and the first end of the switch branch 10, the first end of the switch control branch 90 is connected with the second end of the switch branch 10, and the second end of the switch control branch 90, the third end of the switch branch 10 and the fourth end of the fourth signal processing branch 70 are all grounded to GND.
Specifically, the fourth signal processing branch 70 is configured to rectify and filter the ac power source 200 to provide a charging voltage for the primary winding L1 when the switching branch 10 is conductive. The clamping branch 80 is configured to clamp the voltage across the primary winding L1 to a first voltage threshold when the voltage across the primary winding L1 is greater than the first voltage threshold. The switch control arm 90 is configured to output a pulse width modulated signal to the switch arm 10 to control the switch arm 10 to alternately turn on and off.
In this embodiment, the fourth signal processing branch 70 may employ a diode and a capacitor to implement rectification and filtering, and the specific implementation is within the range of those skilled in the art, and will not be described herein. The clamping branch 80 may be implemented by using components such as a zener diode, and the specific implementation is within a range that is easily understood by those skilled in the art, and will not be described herein. The switching control branch 90 is configured to output a pulse width modulation (Pulse Width Modulation, PWM) signal, and a dedicated PWM chip is used as the switching control branch 90, for example.
Referring to fig. 4, fig. 4 is a schematic circuit diagram of a voltage conversion circuit according to an embodiment of the present disclosure.
In one embodiment, as shown in fig. 4, the switching branch 10 includes a first switching tube Q1.
The first end of the first switching tube Q1 is connected to the first end of the switch control branch 90, the second end of the first switching tube Q1 is connected to the same-name end of the primary winding L1, and the third end of the first switching tube Q1 is grounded to GND.
In this embodiment, the first switching transistor Q1 is taken as an NMOS transistor as an example. The grid electrode of the NMOS tube is a first end of the first switching tube Q1, the source electrode of the NMOS tube is a second end of the first switching tube Q1, and the drain electrode of the NMOS tube is a third end of the first switching tube Q1.
In addition, the first switching transistor Q1 may be any controllable switch, such as an Insulated Gate Bipolar Transistor (IGBT) device, an Integrated Gate Commutated Thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a Silicon Controlled Rectifier (SCR) device, a junction gate field effect transistor (JFET) device, a MOS Controlled Thyristor (MCT) device, or the like.
In an embodiment, the first signal processing branch 30 includes a first diode D1, a first resistor R1, and a first capacitor C1.
The anode of the first diode D1 is connected to the synonym end of the secondary winding L2, the cathode of the first diode D1 is connected to the first end of the first resistor R1, the second end of the first resistor R1 is connected to the first end of the first capacitor C1 and the controller 40, and the second end of the first capacitor C1 is connected to the synonym end of the secondary winding L2.
Specifically, the first diode D1 is used for rectification. The first resistor R1 and the first capacitor C1 are used for filtering.
In an embodiment, the second signal processing branch 50 includes a second resistor R2, a third resistor R3, and a second capacitor C2.
The first end of the second resistor R2 is connected to the third end of the first signal processing branch 30, the second end of the second resistor R2 is connected to the first end of the third resistor R3, the first end of the first capacitor C1, and the controller 40, and the second end of the third resistor R3 and the second end of the first capacitor C1 are both grounded GND.
Specifically, the second resistor R2 and the third resistor R3 are used for voltage division. The second capacitor C2 is used for filtering.
In an embodiment, the third signal processing branch 60 includes a third capacitor C3, a fourth capacitor C4, a second diode D2 and a fourth resistor R4.
The first end of the third capacitor C3 is connected to the same-name end of the secondary winding L2 and the load 300, the second end of the third capacitor C3 and the first end of the fourth resistor R4 are both grounded GND, the second end of the fourth resistor R4 is connected to the first end of the fourth capacitor C4, and the second end of the fourth capacitor C4 is connected to the cathode of the second diode D2 and the different-name end of the secondary winding L2.
Specifically, the second diode D2 is used for rectification. The third capacitor C3 is used for filtering. The combination of the fourth capacitor C4 and the fourth resistor R4 is used for absorbing the peak voltage generated when the second diode D2 is turned on or turned off, so as to protect the components in the voltage conversion circuit 100.
The circuit principle of the voltage conversion circuit 100 shown in fig. 4 is explained below.
When the switch control circuit 90 controls the first switching tube Q1 to be turned on, the ac power supply 200 charges the primary winding L1 of the transformer 20 after passing through the fourth signal processing branch 70. At this time, the secondary winding L2 generates an induced electromotive force, which is the first voltage. When the primary winding L1 is charged, the opposite-name end of the primary winding is positive, and the same-name end is negative. Thus, the opposite-name end of the secondary winding L2 is the positive electrode, and the same-name end is the negative electrode. Then, the first diode D1 is turned on in the forward direction, and the second diode D2 is turned off in the reverse direction. The first voltage is rectified by the first diode D1, and the filtered voltage of the first resistor R1 and the first capacitor C1 is the second voltage. The second voltage is a third voltage after being divided by the second resistor R2 and the third resistor R3 and filtered by the second capacitor C2. The third voltage is input to the controller 40. The controller 40 can reverse the voltage of the ac power source 200 based on the third voltage.
When the switch control circuit 90 controls the first switching tube Q1 to be turned off, the primary winding L1 charging loop is turned off. At this time, the secondary winding L2 discharges the electric energy stored in the transformer 20, and the secondary winding L2 outputs a fourth voltage. The same name end of the secondary winding L2 is a positive electrode, and the different name end is a negative electrode. Then, the first diode D1 is turned off in the reverse direction, and the second diode D2 is turned on in the forward direction. The fourth voltage is rectified by the second diode D2, and the filtered voltage of the third capacitor C3 is output to power the load 300.
In summary, both the process of detecting the voltage of the ac power source 200 and the process of supplying power to the load 300 are implemented. And, the two processes described above are implemented by only one secondary winding L2. Compared with the technical scheme that two secondary windings are needed to be adopted to respectively detect the alternating current power supply and supply power to the load in the related art, the technical scheme provided by the embodiment of the application is lower in cost.
It should be noted that the hardware configuration of the voltage conversion circuit 100 as shown in fig. 4 is only one example, and the voltage conversion circuit 100 may have more or fewer components than shown in the drawing, may combine two or more components, or may have different component configurations, and various components shown in the drawing may be implemented in hardware, software, or a combination of hardware and software including one or more signal processing and/or application specific integrated circuits. For example, in the embodiment of the present application, the first diode D1 and the second diode D2 are used to implement the rectifying function. In other embodiments, rectification may be performed in other manners, for example, a combination of a rectification chip and a switching tube is used to implement the rectification function, and specific implementation manners are within a range that is easily understood by those skilled in the art and are not described herein.
The embodiment of the application also provides an electronic device, which comprises the voltage conversion circuit 100 in any embodiment of the application.
In one embodiment, the electronic device is a bathroom fixture.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; the technical features of the above embodiments or in the different embodiments may also be combined under the idea of the present application, the steps may be implemented in any order, and there are many other variations of the different aspects of the present application as described above, which are not provided in details for the sake of brevity; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A voltage conversion circuit, comprising:
the transformer comprises a primary winding and a secondary winding;
the first end of the switch branch is connected with the homonymous end of the primary winding, the heteronymous end of the primary winding is connected with an alternating current power supply, the heteronymous end of the secondary winding is connected with the first end of the first signal processing branch, the second end of the first signal processing branch is connected with the homonymous end of the secondary winding, and the third end of the first signal processing branch is connected with the controller;
the switching branch is configured to be alternately turned on and off;
the transformer is configured such that when the switching leg is on, the primary winding is charged and a first voltage is generated at the secondary winding;
the first signal processing branch is configured to rectify and filter the first voltage and output a second voltage to the controller to cause the controller to determine the voltage of the ac power source based on the second voltage.
2. The voltage conversion circuit of claim 1, further comprising a second signal processing branch;
the first end of the second signal processing branch is connected with the third end of the first signal processing branch, and the second end of the second signal processing branch is connected with the controller;
the second signal processing branch is configured to divide and filter the second voltage and output a third voltage to the controller, so that the controller determines the voltage of the alternating current power supply based on the third voltage.
3. The voltage conversion circuit according to claim 1 or 2, characterized in that the voltage conversion circuit further comprises a third signal processing branch;
the first end of the third signal processing branch is connected with the synonym end of the secondary winding, and the second end of the third signal processing branch is connected with the synonym end of the secondary winding and the load respectively;
the transformer is further configured such that when the switching leg is turned off, the primary winding stops charging and the secondary winding outputs a fourth voltage;
the third signal processing branch is configured to rectify and filter the fourth voltage to provide a supply voltage for the load.
4. The voltage conversion circuit of claim 1, wherein the first signal processing branch comprises a first diode, a first resistor, and a first capacitor;
the anode of the first diode is connected with the synonym end of the secondary winding, the cathode of the first diode is connected with the first end of the first resistor, the second end of the first resistor is respectively connected with the first end of the first capacitor and the controller, and the second end of the first capacitor is connected with the synonym end of the secondary winding.
5. The voltage conversion circuit of claim 2, wherein the second signal processing branch comprises a second resistor, a third resistor, and a second capacitor;
the first end of the second resistor is connected with the third end of the first signal processing branch, the second end of the second resistor is respectively connected with the first end of the third resistor, the first end of the second capacitor and the controller, and the second end of the third resistor and the second end of the second capacitor are grounded.
6. The voltage conversion circuit of claim 3, wherein the third signal processing branch comprises a third capacitor, a fourth capacitor, a second diode, and a fourth resistor;
the first end of the third capacitor is respectively connected with the same-name end of the secondary winding and the load, the second end of the third capacitor and the first end of the fourth resistor are grounded, the second end of the fourth resistor is connected with the first end of the fourth capacitor, and the second end of the fourth capacitor is respectively connected with the cathode of the second diode and the different-name end of the secondary winding.
7. The voltage conversion circuit of claim 1, further comprising a fourth signal processing branch, a clamping branch, and a switch control branch;
the first end and the second end of the fourth signal processing branch are respectively connected with the first end and the second end of the alternating current power supply, the third end of the fourth signal processing branch is respectively connected with the first end of the clamping branch and the synonym end of the primary winding, the second end of the clamping branch is respectively connected with the homonym end of the primary winding and the first end of the switch branch, and the first end of the switch control branch is connected with the second end of the switch branch;
the fourth signal processing branch is configured to rectify and filter the alternating current power supply to provide a charging voltage for the primary winding when the switching branch is turned on;
the clamping branch is configured to clamp the voltage across the primary winding to a first voltage threshold when the voltage across the primary winding is greater than the first voltage threshold;
the switch control branch is configured to output a pulse width modulation signal to the switch branch to control the switch branch to be alternately turned on and off.
8. The voltage conversion circuit of claim 7, wherein the switching leg comprises a first switching tube;
the first end of the first switching tube is connected with the first end of the switch control branch, the second end of the first switching tube is connected with the homonymous end of the primary winding, and the third end of the first switching tube is grounded.
9. An electronic device comprising a voltage conversion circuit according to any one of claims 1-8.
10. The electronic device of claim 9, wherein the electronic device is a bathroom device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320981091.6U CN220421638U (en) | 2023-04-26 | 2023-04-26 | Voltage conversion circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320981091.6U CN220421638U (en) | 2023-04-26 | 2023-04-26 | Voltage conversion circuit and electronic equipment |
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| Publication Number | Publication Date |
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| CN220421638U true CN220421638U (en) | 2024-01-30 |
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| CN202320981091.6U Active CN220421638U (en) | 2023-04-26 | 2023-04-26 | Voltage conversion circuit and electronic equipment |
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| CN (1) | CN220421638U (en) |
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