Rectification switching circuit and electronic equipment

Abstract

The utility model relates to a rectification switching circuit and electronic equipment, in the rectification switching circuit, a first rectification circuit and a second rectification main circuit are respectively connected with an input power supply, a sampling circuit is connected with a first rectification branch, a switching circuit is connected with a second rectification branch, and a processing chip is connected with the sampling circuit and the switching circuit. The processing chip controls on-off of the switching circuit according to a sampling signal of the sampling circuit, and then the second rectification branch is switched to the first voltage rectification loop or the second voltage rectification loop through the switching circuit, so that rectification loops of corresponding voltages are automatically switched according to input power supplies of different voltages, circuit components and post-stage circuits are prevented from being damaged, and the reliability of the system is improved. And the reliability and the universality of the circuit are improved.

Description

Technical Field

[0001] This application relates to the field of power supply technology, and in particular to a rectifier switching circuit and electronic device. Background Technology

[0002] In power supply circuits, different filtering and rectifier circuits are often designed for different operating voltages (such as 110V and 220V). Power supply circuits designed for 220V often cannot work properly with an input voltage of 110V, while power supply circuits designed for 110V will burn out components and cause circuit damage if a 220V input voltage is connected.

[0003] Currently, in existing power supply circuit designs, when a 220V power supply circuit is connected to a 110V input voltage or a 110V power supply circuit is connected to a 220V input voltage, the subsequent circuit cannot obtain the DC high voltage required for normal operation through the original rectifier circuit, causing the circuit to malfunction or even damage circuit components and subsequent circuits. The circuit has low reliability and poor versatility. Utility Model Content

[0004] Therefore, it is necessary to provide a rectifier switching circuit and electronic device that can automatically switch rectifier circuits, has high reliability, and is highly versatile, in order to address the problems existing in the above-mentioned power supply circuits.

[0005] In a first aspect, this application provides a rectification switching circuit, comprising:

[0006] The rectifier circuit includes a first rectifier branch and a second rectifier branch; the first rectifier circuit and the second rectifier branch are respectively used to connect to the input power supply.

[0007] The sampling circuit is connected to the first rectifier branch;

[0008] A switching circuit is connected to the second rectifier branch. The switching circuit is used to switch the second rectifier branch to either the first voltage rectifier circuit or the second voltage rectifier circuit.

[0009] The processing chip connects the sampling circuit and the switching circuit. The processing chip is used to control the switching circuit to turn on and off based on the sampling signal from the sampling circuit.

[0010] In one embodiment, the sampling circuit includes a voltage divider module and a voltage limiting module;

[0011] The first end of the voltage divider module is connected to the first rectifier branch, and the second end of the voltage divider module is connected to the processing chip and the voltage limiting module respectively; the voltage limiting module is connected to the voltage limiting power supply.

[0012] In one embodiment, the voltage divider module includes at least two first resistors; each first resistor is connected in series between the first rectifier branch and the processing chip.

[0013] In one embodiment, the voltage limiting module includes a first diode and a second diode;

[0014] The cathode of the first diode is connected to the voltage limiting power supply, the anode of the first diode is connected to the second terminal of the voltage divider module and the cathode of the second diode, and the anode of the second diode is connected to the ground wire.

[0015] In one embodiment, the sampling circuit further includes a filtering module;

[0016] The first end of the filter module is connected to the ground wire, and the second end of the filter module is connected to the second end of the voltage divider module.

[0017] In one embodiment, the filtering module includes a second resistor and a first capacitor;

[0018] The first terminal of the second resistor is connected to the second terminal of the voltage divider module, and the second terminal of the second resistor is connected to the ground wire; the positive terminal of the first capacitor is connected to the first terminal of the second resistor, and the negative terminal of the first capacitor is connected to the second terminal of the second resistor.

[0019] In one embodiment, the switching circuit includes a first transistor and a first relay; the second rectifier branch includes a rectifier module, a second capacitor and a third capacitor; the input terminal of the rectifier module is connected to the input power supply, the positive terminal of the second capacitor is connected to the output terminal of the rectifier module, the negative terminal of the second capacitor is connected to the positive terminal of the third capacitor, and the negative terminal of the third capacitor is connected to the ground wire.

[0020] The base of the first transistor is connected to the processing chip, the emitter of the first transistor is connected to ground, and the collector of the first transistor is connected to the control terminal of the first relay. The first selection terminal of the first relay is connected to the input terminal of the rectifier module, and the second selection terminal of the first relay is connected between the negative terminal of the second capacitor and the positive terminal of the third capacitor.

[0021] In one embodiment, the switching circuit further includes a third resistor;

[0022] The first end of the third resistor is connected to the base of the first transistor, and the second end of the third resistor is connected to the processing chip.

[0023] In one embodiment, the second rectifier branch further includes an over-temperature protection module;

[0024] The over-temperature protection module is connected to the input terminal of the rectifier module and the input power supply.

[0025] Secondly, this application provides an electronic device including a rectifier switching circuit as described in any of the above claims.

[0026] One of the above technical solutions has the following advantages and beneficial effects:

[0027] The aforementioned rectification switching circuit includes a rectifier circuit, a sampling circuit, a switching circuit, and a processing chip. The rectifier circuit includes a first rectifier branch and a second rectifier branch. The first rectifier circuit and the second rectifier branch are respectively used to connect to the input power supply. The sampling circuit is connected to the first rectifier branch. The switching circuit is connected to the second rectifier branch. The processing chip is connected to the sampling circuit and the switching circuit. The processing chip is used to control the switching circuit to open or close according to the sampling signal of the sampling circuit, and then switch the second rectifier branch to the first voltage rectifier circuit or the second voltage rectifier circuit through the switching circuit, so as to realize the automatic switching of the corresponding voltage rectifier circuit according to the input power supply of different voltages. This application uses a sampling circuit to sample the voltage of the input power supply after it has been processed by the first rectifier branch, thereby achieving voltage detection of the input power supply. By setting up a switching circuit connecting the second rectifier branch and the processing chip, the processing chip can control the on / off state of the switching circuit based on the voltage sampling result of the sampling circuit. This allows the switching circuit to switch the second rectifier branch between the first and second voltage rectifier circuits, enabling automatic switching of the appropriate voltage rectifier circuit according to the input power supply voltage. This avoids damage to circuit components and subsequent circuits, improving the reliability and versatility of the circuit. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the first structure of a rectifier switching circuit in one embodiment;

[0029] Figure 2 This is a schematic diagram of the second structure of the rectifier switching circuit in one embodiment;

[0030] Figure 3 This is a schematic diagram of the third structure of the rectifier switching circuit in one embodiment;

[0031] Figure 4 This is a circuit diagram of a rectifier switching circuit in one embodiment.

[0032] Figure label:

[0033] 10. Rectifier circuit; 110. First rectifier branch; 120. Second rectifier branch; 122. Rectifier module; 124. Over-temperature protection module; 20. Sampling circuit; 210. Voltage divider module; 220. Voltage limiting module; 230. Filtering module; 30. Switching circuit; 40. Processing chip;

[0034] R1, first resistor; R2, second resistor; R3, third resistor; C1, first capacitor; C2, second capacitor; C3, third capacitor; D1, first diode; D2, second diode; Q1, first transistor; K1, first relay. Detailed Implementation

[0035] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0036] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0037] In addition, the term "multiple" should mean two or more.

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] In one embodiment, such as Figure 1 As shown, a rectification switching circuit is provided. The circuit includes a rectifier circuit 10, a sampling circuit 20, a switching circuit 30, and a processing chip 40. The rectifier circuit 10 includes a first rectifier branch 110 and a second rectifier branch 120. The first rectifier circuit 10 and the second rectifier branch are respectively used to connect to the input power supply. The sampling circuit 20 is connected to the first rectifier branch 110. The switching circuit 30 is connected to the second rectifier branch 120 and is used to switch the second rectifier branch 120 as a first voltage rectifier circuit or a second voltage rectifier circuit. The processing chip 40 is connected to the sampling circuit 20 and the switching circuit 30 and is used to control the switching circuit 30 to open or close according to the sampling signal of the sampling circuit 20.

[0040] The input power supply can be an AC power supply with an operating voltage of 220V or 110V. The rectifier circuit 10 can be a bridge rectifier circuit 10, used to rectify the AC signal transmitted from the input power supply and output a DC signal. The rectifier circuit 10 includes a first rectifier branch 110, used to rectify the AC signal from the input power supply and output a first DC signal for use by the sampling circuit 20 for voltage acquisition. The rectifier circuit 10 also includes a second rectifier branch 120, used to rectify the AC signal from the input power supply and output a second DC signal to the load, thus supplying power to the load.

[0041] The sampling circuit 20 can be a voltage sampling circuit 20. Since the sampling circuit 20 is connected to the first rectifier branch 110 and the processing chip 40 respectively, it can sample the first DC signal output from the first rectifier branch 110 to obtain a sampled voltage signal, and transmit the sampled voltage signal to the processing chip 40. The processing chip 40 can then determine the voltage magnitude of the input power supply based on the sampled voltage signal. For example, the sampling circuit 20 can divide the first DC signal output from the first rectifier branch 110 to obtain a sampled voltage signal that meets the voltage acquisition requirements of the processing chip 40.

[0042] The switching circuit 30 is used to switch the second rectifier branch 120 to either the first voltage rectifier circuit or the second voltage rectifier circuit. The first voltage rectifier circuit can be a non-voltage doubler bridge rectifier circuit, and the second voltage rectifier circuit can be a voltage doubler bridge rectifier circuit. For example, when the switching circuit 30 is open, the second rectifier branch 120 is switched to the first voltage rectifier circuit; when the switching circuit 30 is on, the second rectifier branch 120 is switched to the second voltage rectifier circuit.

[0043] The processing chip 40 can be, but is not limited to, a 51 series microcontroller chip. The processing chip 40 is connected to the switching circuit 30 and the sampling circuit 20. When an input power supply is connected, the sampling voltage samples the first DC signal output from the first rectifier branch 110 to obtain a sampled voltage signal, which is then transmitted to the processing chip 40. The processing chip 40 controls the switching circuit 30 to open and close based on the magnitude of the sampled voltage signal. Furthermore, depending on the channel of the switching circuit 30, it switches the second rectifier branch 120 to either the first voltage rectifier circuit or the second voltage rectifier circuit, thus automatically adjusting the voltage multiplier of the second rectifier branch 120 based on the voltage detection result. This allows for stable operation under different input voltage conditions, improving the circuit's voltage adaptability and reliability.

[0044] For example, when the input voltage of the power supply is 220V, the voltage of the sampling voltage signal obtained by the sampling circuit 20 is greater than the preset voltage threshold, that is, the voltage of the sampling voltage signal is a high-level voltage. The processing chip 40 controls the switching circuit 30 to open, and then the switching circuit 30 switches the second rectifier branch 120 to the first voltage rectifier circuit (such as a non-voltage doubler bridge rectifier circuit). When the input voltage of the power supply is 110V, the voltage of the sampling voltage signal obtained by the sampling circuit 20 is less than the preset voltage threshold, that is, the voltage of the sampling voltage signal is a low-level voltage. The processing chip 40 controls the switching circuit 30 to turn on, and then the switching circuit 30 switches the second rectifier branch 120 to the second voltage rectifier circuit (such as a voltage doubler bridge rectifier circuit), so that the output voltage is doubled to be consistent with the input voltage of 220V. This realizes automatic switching of the rectifier circuit according to different input voltages, so that the circuit can operate stably.

[0045] In the above embodiments, the first rectifier circuit 10 and the second rectifier main circuit are respectively used to connect to the input power supply. The sampling circuit 20 is connected to the first rectifier branch 110, the switching circuit 30 is connected to the second rectifier branch 120, and the processing chip 40 is connected to the sampling circuit 20 and the switching circuit 30. The processing chip 40 controls the switching circuit 30 to open and close according to the sampling signal of the sampling circuit 20, and then switches the second rectifier branch 120 to the first voltage rectifier circuit or the second voltage rectifier circuit through the switching circuit 30, so as to realize the automatic switching of the corresponding voltage rectifier circuit according to the input power supply of different voltages. This application uses a sampling circuit 20 to sample the voltage of the input power supply after it has been processed by the first rectifier branch 110, thereby realizing voltage detection of the input power supply. By setting up a switching circuit 30 connecting the second rectifier branch 120 and the processing chip 40, the processing chip 40 can control the switching circuit 30 to open or close based on the voltage sampling result of the sampling circuit 20. This allows the switching circuit 30 to switch the second rectifier branch 120 to either the first voltage rectifier circuit or the second voltage rectifier circuit, thus automatically switching the rectifier circuit to the appropriate voltage based on the input power supply voltage. This avoids damage to circuit components and subsequent circuits, improving the reliability and versatility of the circuit.

[0046] In one embodiment, such as Figure 2 As shown, the sampling circuit 20 includes a voltage divider module 210 and a voltage limiting module 220; the first end of the voltage divider module 210 is connected to the first rectifier branch 110, and the second end of the voltage divider module 210 is connected to the processing chip 40 and the voltage limiting module 220 respectively; the voltage limiting module 220 is connected to the voltage limiting power supply.

[0047] The voltage divider module 210 divides the first DC signal output from the first rectifier branch 110 to obtain a lower sampling voltage. This sampling voltage is sufficient to meet the operating voltage range of the voltage limiting module 220, thus satisfying the sampling voltage range of the processing chip 40 and preventing damage to components due to an excessively high sampling voltage. The voltage limiting module 220 limits the sampling voltage output from the voltage divider module 210 to a preset voltage range, achieving a voltage clamping function. The voltage limiting power supply can be, but is not limited to, a 5V DC signal.

[0048] For example, the first end of the voltage divider module 210 is connected to the first rectifier branch 110, and the second end of the voltage divider module 210 is connected to the processing chip 40 and the voltage limiting module 220 respectively. The voltage limiting module 220 is connected to a voltage limiting power supply. When a 220V input power supply is connected, the first rectifier branch 110 rectifies the 220V AC signal to obtain a corresponding first DC signal. The voltage divider module 210 performs voltage division processing on the first DC signal to obtain a voltage divider signal of the corresponding voltage. The voltage limiting module 220 performs voltage limiting processing on the voltage divider signal, so that the voltage divider signal is limited to a preset voltage range, thereby obtaining a sampled voltage signal. The processing chip 40 detects that the voltage of the sampled voltage signal is high based on the obtained sampled voltage signal. Then, the processing chip 40 controls the switching circuit 30 to open, and the switching circuit 30 switches the second rectifier branch 120 to a non-voltage doubler bridge. The rectifier circuit, when connected to a 110V input power supply, rectifies the 110V AC signal to obtain a corresponding first DC signal. The voltage divider module 210 divides the corresponding first DC signal to obtain a voltage divider signal. The voltage limiting module 220 limits the voltage divider signal to a preset voltage level, thereby obtaining a sampled voltage signal. The processing chip 40 detects that the sampled voltage signal is low based on the obtained sampled voltage signal. The processing chip 40 then controls the switching circuit 30 to open, and the switching circuit 30 switches the second rectifier branch 120 to a non-voltage doubler bridge rectifier circuit. This achieves automatic switching of the rectifier circuit according to different input voltages, enabling the circuit to operate stably, avoiding damage to circuit components and subsequent circuits, and improving the reliability and versatility of the circuit.

[0049] In one embodiment, such as Figure 4 As shown, the voltage divider module 210 includes at least two first resistors R1; each first resistor R1 is connected in series between the first rectifier branch 110 and the processing chip 40.

[0050] In this circuit, the first resistor R1 is a voltage divider resistor, which can be a high-impedance resistor. Since each of the first resistors R1 is connected in series between the first rectifier branch 110 and the processing chip 40, the first DC signal output from the first rectifier branch 110 can be divided to obtain a lower voltage divided signal, ensuring that the voltage of this divided signal meets the operating voltage range of the voltage limiting module 220. For example, when the voltage of the first DC signal is below 156V, the divided signal should be at a low level; when the voltage of the first DC signal is above 309V, the divided signal should be at a high level.

[0051] In one embodiment, such as Figure 4 As shown, the voltage limiting module 220 includes a first diode D1 and a second diode D2; the cathode of the first diode D1 is connected to the voltage limiting power supply, the anode of the first diode D1 is connected to the second terminal of the voltage divider module 210 and the cathode of the second diode D2, and the anode of the second diode D2 is connected to the ground wire.

[0052] The first diode D1 and the second diode D2 form a diode clamping module, which can realize the voltage clamping function. For example, ignoring the diode forward voltage drop, the first diode D1 and the second diode D2 can control the input voltage (Vout) at the corresponding pin of the processing chip 40 within the range of (5V, GND). For example, when the voltage of the voltage divider signal is greater than 5V, Vout = 5V; when the voltage of the voltage divider signal is less than GND, then Vout = GND.

[0053] In one embodiment, such as Figure 3 As shown, the sampling circuit 20 also includes a filtering module 230; the first end of the filtering module 230 is connected to the ground wire, and the second end of the filtering module 230 is connected to the second end of the voltage divider module 210.

[0054] The filter module 230 may be, but is not limited to, an RC low-pass filter module 230.

[0055] Since the first end of the filter module 230 is connected to the ground wire and the second end of the filter module 230 is connected to the second end of the voltage divider module 210, the electrical signal output by the voltage limiting module 220 can be filtered and the filtered voltage signal can be transmitted to the processing signal. This achieves high-frequency noise removal, noise reduction and voltage spike absorption of the sampled voltage signal, avoiding damage to the processing chip 40 and improving the reliability of the circuit.

[0056] In one embodiment, such as Figure 4As shown, the filter module 230 includes a second resistor R2 and a first capacitor C1; the first end of the second resistor R2 is connected to the second end of the voltage divider module 210, and the second end of the second resistor R2 is connected to the ground wire; the positive terminal of the first capacitor C1 is connected to the first end of the second resistor R2, and the negative terminal of the first capacitor C1 is connected to the second end of the second resistor R2.

[0057] The second resistor R2 and the first capacitor C1 are connected in parallel between the voltage limiting module 220 and the ground wire. The second resistor R2 and the first capacitor C1 form an RC low-pass filter module 230, which can filter out high-frequency noise, reduce noise and absorb voltage spikes in the sampled voltage signal.

[0058] In one embodiment, such as Figure 4 As shown, the switching circuit 30 includes a first transistor Q1 and a first relay K1; the second rectifier branch 120 includes a rectifier module 122, a second capacitor C2, and a third capacitor C3; the input terminal of the rectifier module 122 is connected to the input power supply, the positive terminal of the second capacitor C2 is connected to the output terminal of the rectifier module 122, the negative terminal of the second capacitor C2 is connected to the positive terminal of the third capacitor C3, and the negative terminal of the third capacitor C3 is connected to ground; the base of the first transistor Q1 is connected to the processing chip 40, the emitter of the first transistor Q1 is connected to ground, and the collector of the first transistor Q1 is connected to the control terminal of the first relay K1; the first selection terminal of the first relay K1 is connected to the input terminal of the rectifier module 122, and the second selection terminal of the first relay K1 is connected between the negative terminal of the second capacitor C2 and the positive terminal of the third capacitor C3.

[0059] The rectifier module 122 can be a half-bridge rectifier module 122, and the second capacitor C2 and the third capacitor C3 are high-voltage electrolytic capacitors. The charging of the second capacitor C2 and the third capacitor C3 can be adjusted by the switching circuit 30, thereby realizing the voltage-multiplied or non-voltage-multiplied control of the input power supply.

[0060] Based on the connection of the first relay K1 between the second capacitor C2 and the third capacitor C3, and the connection between the first relay K1 and the processing chip 40 through the first transistor Q1, when the input voltage is 220V, the processing chip 40 detects that the sampling voltage signal is high level, and then the processing chip 40 outputs a low level to the first transistor Q1, causing the first transistor Q1 to be cut off and the first relay K1 to be disconnected. At this time, the second rectifier branch 120 switches to a non-voltage doubler bridge rectifier circuit. If the input voltage is 110V, the processing chip 40 detects that the sampling voltage signal is low level, and then the processing chip 40 outputs a high level to the first transistor Q1, causing the first transistor Q1 to be turned on and the first relay K1 to be closed. At this time, the second rectifier branch 120 switches to a voltage doubler bridge rectifier circuit, and the output voltage is doubled to be consistent with the input of 220V.

[0061] In the above embodiment, the sampling circuit 20 samples the voltage of the input power supply after processing by the first rectifier branch 110, thereby realizing voltage detection of the input power supply. By connecting the first relay K1 and the first transistor Q1 controlled by the input voltage detection in the rectifier circuit 10, the processing chip 40 can control the on / off state of the first transistor Q1 and the first relay K1 according to the voltage sampling result of the sampling circuit 20. In turn, the first relay K1 switches the second rectifier branch 120 to either the first voltage rectifier circuit or the second voltage rectifier circuit, realizing the circuit's autonomous voltage protection and automatic control of the output circuit type. The rectifier circuit 10 is designed to be compatible with both 110V and 220V operating voltages, expanding the versatility of electronic devices using this circuit scheme, avoiding damage to circuit components and subsequent circuits, and improving the reliability of the circuit.

[0062] In one embodiment, such as Figure 4 As shown, the switching circuit 30 also includes a third resistor R3; the first end of the third resistor R3 is connected to the base of the first transistor Q1, and the second end of the third resistor R3 is connected to the processing chip 40.

[0063] The third resistor R3 is a current-limiting resistor. By connecting the third resistor R3 in series between the processing chip 40 and the first transistor Q1, the current flowing through the first transistor Q1 is limited, preventing excessive current from damaging the component and improving the reliability of the circuit.

[0064] In one embodiment, such as Figure 4 As shown, the second rectifier branch 120 also includes an over-temperature protection module 124; the over-temperature protection module 124 is connected to the input terminal of the rectifier module 122 and is connected to the input power supply.

[0065] The input power supply can be, but is not limited to, a 12V DC power supply. The over-temperature protection module 124 is connected to both the rectifier module 122 and the input power supply. When the over-temperature protection module 124 detects that the temperature exceeds a threshold, it disconnects the input terminal of the rectifier module 122, thus protecting the circuit, preventing damage to circuit components and subsequent circuits, and improving circuit reliability.

[0066] For example, the over-temperature protection module 124 may include a second relay. The first end of the second relay is connected to the processing chip 40, the second end of the second relay is connected to the input power supply, and the third end of the second relay is connected to the input terminal of the rectifier module 122. When the processing chip 40 detects that the temperature exceeds the threshold, the processing chip 40 controls the second relay to disconnect, thereby disconnecting the input terminal of the rectifier module 122 and realizing the protection of the circuit.

[0067] It should be noted that the second rectifier branch 120 also includes an overvoltage protection module. For example, the overvoltage protection module is connected between the input power supply and the rectifier module 122. When the overvoltage protection module detects that the voltage exceeds the threshold, the overvoltage protection module disconnects the input terminal of the rectifier module 122 to protect the circuit, avoid damage to circuit components and subsequent circuits, and further improve the reliability of the circuit.

[0068] In one embodiment, an electronic device is also provided, including a rectifier switching circuit as described in any of the above.

[0069] The rectifier switching circuit includes a rectifier circuit, a sampling circuit, a switching circuit, and a processing chip. The rectifier circuit includes a first rectifier branch and a second rectifier branch. The first rectifier circuit and the second rectifier branch are respectively used to connect to the input power supply. The sampling circuit is connected to the first rectifier branch. The switching circuit is connected to the second rectifier branch. The processing chip is connected to the sampling circuit and the switching circuit. The processing chip is used to control the switching circuit to open or close according to the sampling signal of the sampling circuit, and then switch the second rectifier branch to the first voltage rectifier circuit or the second voltage rectifier circuit through the switching circuit. This realizes the circuit's autonomous voltage protection and automatic control of the output circuit type. The rectifier circuit is designed to be compatible with both 110V and 220V operating voltages, expanding the versatility of electronic devices using this circuit scheme.

[0070] In the above embodiments, the voltage of the input power supply after processing by the first rectifier branch is sampled by the sampling circuit to realize the voltage detection of the input power supply. By setting a switching circuit connecting the second rectifier branch and the processing chip, the processing chip can control the switching circuit to open or close according to the voltage sampling result of the sampling circuit. The switching circuit switches the second rectifier branch to the first voltage rectifier circuit or the second voltage rectifier circuit, realizing automatic switching of the rectifier circuit with the corresponding voltage according to the voltage of the input power supply. This avoids damage to circuit components and subsequent circuits, and improves the reliability and versatility of electronic equipment.

[0071] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0072] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A rectifier switching circuit, characterized in that, include: A rectifier circuit, comprising a first rectifier branch and a second rectifier branch; the first rectifier branch and the second rectifier branch are respectively used to connect to the input power supply; A sampling circuit is connected to the first rectifier branch; A switching circuit is connected to the second rectifier branch, and the switching circuit is used to switch the second rectifier branch as a first voltage rectifier circuit or a second voltage rectifier circuit; A processing chip is provided, which is connected to the sampling circuit and the switching circuit. The processing chip is used to control the switching circuit to open or close based on the sampling signal from the sampling circuit.

2. The rectifier switching circuit according to claim 1, characterized in that, The sampling circuit includes a voltage divider module and a voltage limiting module; The first end of the voltage divider module is connected to the first rectifier branch, and the second end of the voltage divider module is connected to the processing chip and the voltage limiting module respectively; the voltage limiting module is connected to the voltage limiting power supply.

3. The rectifier switching circuit according to claim 2, characterized in that, The voltage divider module includes at least two first resistors; each of the first resistors is connected in series between the first rectifier branch and the processing chip.

4. The rectifier switching circuit according to claim 2, characterized in that, The voltage limiting module includes a first diode and a second diode; The cathode of the first diode is connected to the voltage limiting power supply, the anode of the first diode is connected to the second terminal of the voltage divider module and the cathode of the second diode, and the anode of the second diode is connected to the ground wire.

5. The rectifier switching circuit according to claim 4, characterized in that, The sampling circuit also includes a filtering module; The first end of the filter module is connected to the ground wire, and the second end of the filter module is connected to the second end of the voltage divider module.

6. The rectifier switching circuit according to claim 5, characterized in that, The filtering module includes a second resistor and a first capacitor; The first end of the second resistor is connected to the second end of the voltage divider module, and the second end of the second resistor is connected to the ground wire; the positive terminal of the first capacitor is connected to the first end of the second resistor, and the negative terminal of the first capacitor is connected to the second end of the second resistor.

7. The rectifier switching circuit according to any one of claims 1 to 6, characterized in that, The switching circuit includes a first transistor and a first relay; the second rectifier branch includes a rectifier module, a second capacitor and a third capacitor; the input terminal of the rectifier module is connected to the input power supply, the positive terminal of the second capacitor is connected to the output terminal of the rectifier module, the negative terminal of the second capacitor is connected to the positive terminal of the third capacitor, and the negative terminal of the third capacitor is connected to ground. The base of the first transistor is connected to the processing chip, the emitter of the first transistor is connected to ground, and the collector of the first transistor is connected to the control terminal of the first relay; the first selection terminal of the first relay is connected to the input terminal of the rectifier module, and the second selection terminal of the first relay is connected between the negative terminal of the second capacitor and the positive terminal of the third capacitor.

8. The rectifier switching circuit according to claim 7, characterized in that, The switching circuit also includes a third resistor; The first end of the third resistor is connected to the base of the first transistor, and the second end of the third resistor is connected to the processing chip.

9. The rectifier switching circuit according to claim 7, characterized in that, The second rectifier branch also includes an over-temperature protection module; The over-temperature protection module is connected to the input terminal of the rectifier module, and the over-temperature protection module is connected to the input power supply.

10. An electronic device, characterized in that, Includes the rectifier switching circuit as described in any one of claims 1 to 9.

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