Conversion circuit, power supply and electronic equipment thereof

Abstract

The present application relates to a conversion circuit, a power supply and an electronic device thereof. The conversion circuit includes: a primary clamping circuit, an overvoltage protection circuit and a secondary clamping circuit. The primary clamping circuit is connected to the power supply; the primary clamping circuit is used to receive the initial voltage provided by the power supply and generate a first voltage; the amplitude of the first voltage is within a first preset range. The overvoltage protection circuit is connected to the primary clamping circuit; the overvoltage protection circuit is used to generate a second voltage when the amplitude of the first voltage is greater than or equal to a preset threshold; the amplitude of the second voltage is less than the preset threshold; the secondary clamping circuit is connected to both the overvoltage protection circuit and the load; the secondary clamping circuit is used to receive the second voltage and generate a target voltage; the amplitude of the target voltage is within a second preset range; the second preset range is associated with the rated voltage of the load. The present application is conducive to using a simple circuit to control the output voltage of the power supply battery and effectively protect the load in the subsequent circuit.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and in particular to a conversion circuit, a power supply and electronic equipment thereof. Background Art

[0002] In the field of electrical automation, it is necessary to control the output voltage of the battery to ensure that the output voltage of the battery is within the rated voltage range of the load and to ensure the normal operation of the subsequent circuit.

[0003] However, the battery control technology used in the related art has problems such as high cost, complicated logic and complex circuit design, which easily leads to waste of costs and increased process difficulty. Utility Model Content

[0004] Based on this, the embodiments of the present application provide a conversion circuit, a power supply and an electronic device thereof, so as to control the output voltage of the power supply battery by using a simple circuit, thereby effectively protecting the load in the subsequent circuit.

[0005] In order to achieve the above-mentioned purpose, in the first aspect, some embodiments of the present application provide a conversion circuit. The conversion circuit includes a primary clamping circuit, an overvoltage protection circuit and a secondary clamping circuit. The primary clamping circuit is connected to the power supply; the primary clamping circuit is used to receive the initial voltage provided by the power supply and generate a first voltage; the amplitude of the first voltage is within a first preset range. The overvoltage protection circuit is connected to the primary clamping circuit; the overvoltage protection circuit is used to generate a second voltage when the amplitude of the first voltage is greater than or equal to a preset threshold; the amplitude of the second voltage is less than the preset threshold; the secondary clamping circuit is connected to both the overvoltage protection circuit and the load; the secondary clamping circuit is used to receive the second voltage and generate a target voltage; the amplitude of the target voltage is within a second preset range; the second preset range is associated with the rated voltage of the load.

[0006] In some embodiments, the primary clamp circuit includes a first transistor, a first diode, and a first current limiting resistor. The first transistor is configured as follows: a first end is connected to the positive electrode of a power supply, and a second end is connected to its control end via a first voltage-dividing resistor; the first diode is configured as follows: a cathode is connected to the second end of the first transistor, and an anode is connected to the control end of the first transistor; the first current limiting resistor is configured as follows: a first end is connected to the second end of the first transistor, and a second end is connected to the negative electrode of the power supply.

[0007] In some embodiments, the overvoltage protection circuit includes a second transistor and a second diode. The second transistor is configured as follows: a first end is connected to the second end of the first transistor, a second end is connected to the secondary clamping circuit, and a control end is connected to the second end of the first transistor via a second current limiting resistor and a third current limiting resistor in sequence; the second diode is configured as follows: a cathode is connected to the control end of the second transistor via the second current limiting resistor, and an anode is connected to the second end of the first current limiting resistor.

[0008] In some embodiments, the secondary clamping circuit includes a third transistor, a third diode, a fourth current limiting resistor and a filter circuit. The third transistor is configured as follows: a first end is connected to the second end of the first transistor, a second end is connected to the load, and a control end is connected to the second end of the second transistor; the third diode is configured as follows: a cathode is connected to the first end of the third transistor, and an anode is connected to the control end of the third transistor; the fourth current limiting resistor is configured as follows: a first end is connected to the control end of the third transistor, and a second end is connected to the anode of the second diode; and the filter circuit is located between the first end and the control end of the third transistor.

[0009] In some embodiments, the filter circuit includes a filter capacitor and a filter resistor. The filter capacitor is configured such that a first end is connected to a first end of the third transistor and a second end is connected to a control end of the third transistor; the filter resistor is configured such that a first end is connected to a control end of the third transistor and a second end is connected to a control end of the third transistor.

[0010] In some embodiments, the conversion circuit further includes a fuse. The fuse is configured such that: a first end of the fuse is connected to the positive electrode of the power source, and a second end of the fuse is connected to the primary clamping circuit.

[0011] In some embodiments, the primary clamping circuit includes a first transistor, and the secondary clamping circuit includes a third transistor; wherein the first transistor includes a metal oxide semiconductor field effect transistor, and / or the third transistor includes a metal oxide semiconductor field effect transistor.

[0012] In some embodiments, the overvoltage protection circuit includes a second transistor; wherein the second transistor includes a bipolar junction transistor.

[0013] In a second aspect, the present application also provides a power supply according to some embodiments. The power supply includes the conversion circuit as described in the first aspect of the embodiment of the present application; the power supply is used to control the target voltage output by the power supply to the load so that the target voltage is associated with the rated voltage of the load.

[0014] In a third aspect, the present application also provides an electronic device according to some embodiments. The electronic device comprises a housing and a conversion circuit as described in the first aspect of the embodiment of the present application; the conversion circuit is at least partially located in a receiving space of the housing.

[0015] The embodiments of the present application may or at least have the following advantages:

[0016] In the embodiment of the present application, by setting a multi-stage clamping circuit (i.e., a primary clamping circuit and a secondary clamping circuit), the output voltage of the power supply (i.e., the input voltage of the load) is limited step by step, so that the amplitude of the voltage generated by each stage of the clamping circuit is limited to a preset range, and the preset range is associated with the rated voltage of the load; in addition, an overvoltage protection circuit is set between the primary clamping circuit and the secondary clamping circuit to ensure that the amplitude of the voltage received by the secondary clamping circuit is less than a preset threshold value, so as to effectively ensure the clamping function of the conversion circuit. In this way, the conversion circuit provided in the embodiment of the present application adopts a simple combination of transistors, diodes, capacitors and resistors, and can limit the output voltage of the battery (i.e., the input voltage of the load) to a preset range associated with the rated voltage of the load through a simple circuit structure, thereby achieving effective control of the output voltage of the battery, protecting the load in the subsequent circuit, and ensuring the normal operation of the circuit.

[0017] The details of one or more embodiments of the present application are set forth in the following drawings and description. Other features, objects, and advantages of the present application will become apparent from the description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 is a schematic diagram of the structure of a conversion circuit provided in some embodiments;

[0020] Figure 2 A schematic diagram of the circuit principle of a conversion circuit provided in some embodiments.

[0021] Description of reference numerals:

[0022] 100-conversion circuit, 1-primary clamping circuit, 2-overvoltage protection circuit, 3-secondary clamping circuit, Q1-first transistor, Q2-second transistor, Q3-third transistor, D1-first diode, D2-second diode, D3-third diode, Ra1-first voltage dividing resistor, Rb1-first current limiting resistor, Rb2-second current limiting resistor, Rb3-third current limiting resistor, Rb4-fourth current limiting resistor, 31-filtering circuit, C-filtering capacitor, Rf-filtering resistor, BT-power supply, F-fuse, RL-load. DETAILED DESCRIPTION

[0023] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0025] It should be understood that when an element or layer is referred to as being "on," "adjacent to," or "connected to" another element or layer, it may be directly on, adjacent to, connected to, or coupled to the other element or layer, or there may be an intervening element or layer. It should be understood that, although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers, doping types, and / or portions, these elements, components, regions, layers, doping types, and / or portions should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer, doping type, or portion from another element, component, region, layer, doping type, or portion. Therefore, without departing from the teachings of the present application, the first element, component, region, layer, doping type, or portion discussed below may be represented as a second element, component, region, layer, or portion.

[0026] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that when the terms "consisting of" and / or "comprising" are used in this specification, the presence of the features, integers, steps, operations, elements and / or parts can be determined, but the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups is not excluded. At the same time, when used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0027] Embodiments of the utility model are described herein with reference to cross-sectional views which are schematic diagrams of ideal embodiments (and intermediate structures) of the present application, so that variations in the shapes shown due to, for example, manufacturing techniques and / or tolerances can be expected. Embodiments of the present application should not be limited to the specific shapes of the zones shown herein, but include shape deviations due to, for example, manufacturing techniques. Therefore, the zones shown in the figures are schematic in nature, and their shapes do not represent the actual shapes of the zones of the device, and do not limit the scope of the present application.

[0028] The embodiments of the present application provide a conversion circuit, a power supply and an electronic device thereof, so as to control the output voltage of a power supply battery by using a simple circuit, thereby effectively protecting the load in the subsequent circuit.

[0029] In a first aspect, some embodiments of the present application provide a conversion circuit. In some embodiments, see Figure 1-Figure 2 , the conversion circuit 100 includes a primary clamp circuit 1, an overvoltage protection circuit 2 and a secondary clamp circuit 3. The primary clamp circuit 1 is connected to the power supply BT; the primary clamp circuit 1 is used to receive the initial voltage provided by the power supply BT and generate a first voltage; the amplitude of the first voltage is within a first preset range. The overvoltage protection circuit 2 is connected to the primary clamp circuit 1; the overvoltage protection circuit 2 is used to generate a second voltage when the amplitude of the first voltage is greater than or equal to a preset threshold; the amplitude of the second voltage is less than the preset threshold; the secondary clamp circuit 3 is connected to both the overvoltage protection circuit 2 and the load; the secondary clamp circuit 3 is used to receive the second voltage and generate a target voltage (PWR out); the amplitude of the target voltage is within a second preset range; the second preset range is associated with the rated voltage of the load.

[0030] Illustratively, the power source BT includes, but is not limited to, a battery.

[0031] It should be explained that the clamping mentioned here and below refers to limiting the potential of a certain point in the circuit by utilizing the characteristics that the forward conduction voltage drop of the diode is relatively stable and has a small value (for example, can be approximately zero).

[0032] For example, the second preset range is associated with the rated voltage of the load, which means that the maximum value of the second preset range is less than or equal to the rated voltage of the load.

[0033] It should be noted that the first preset range, the preset threshold and / or the second preset range in the embodiments of the present application can be set to match the actual working requirements of the load.

[0034] Please continue reading Figure 1-Figure 2, by setting a multi-stage clamping circuit (i.e., a primary clamping circuit 1 and a secondary clamping circuit 3), the output voltage of the power supply BT (i.e., the input voltage of the load) is limited step by step, so that the amplitude of the voltage generated by each stage of the clamping circuit is limited to a preset range, and the preset range is associated with the rated voltage of the load; in addition, an overvoltage protection circuit 2 is set between the primary clamping circuit 1 and the secondary clamping circuit 3 to ensure that the amplitude of the voltage received by the secondary clamping circuit 3 is less than a preset threshold value, so as to effectively ensure the clamping function of the conversion circuit 100. In this way, the conversion circuit 100 provided in the embodiment of the present application adopts a simple combination of transistors, diodes, capacitors and resistors, and can limit the output voltage of the battery (i.e., the input voltage of the load) to a preset range associated with the rated voltage of the load through a simple circuit structure, thereby achieving effective control of the output voltage of the battery, protecting the load in the subsequent circuit, and ensuring the normal operation of the circuit.

[0035] In some embodiments, see Figure 2 The first-level clamp circuit 1 includes a first transistor Q1, a first diode D1 and a first current-limiting resistor Rb1. The first transistor Q1 is configured as follows: the first end is connected to the positive electrode of the power supply BT, and the second end is connected to its control end via the first voltage-dividing resistor Ra1; the first diode D1 is configured as follows: the cathode is connected to the second end of the first transistor Q1, and the anode is connected to the control end of the first transistor Q1; the first current-limiting resistor Rb1 is configured as follows: the first end is connected to the second end of the first transistor Q1, and the second end is connected to the negative electrode of the power supply BT.

[0036] In some examples, the first transistor Q1 includes a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) transistor.

[0037] By way of example, the first transistor Q1 may be a P-doped metal oxide semiconductor field effect transistor.

[0038] Here, it should be noted that there is a body diode (ie, DS diode) between the drain and source of the MOSFET, and the body diode has a clamping voltage like a normal diode, so the MOSFET has a clamping function.

[0039] In the embodiment of the present application, the clamping function of the first transistor Q1 and the first diode is used to limit the initial voltage provided by the power supply BT, so as to limit the amplitude of the first voltage generated by the first-stage clamping circuit 1 to a first preset range, thereby achieving effective control of the battery output voltage and protecting the load in the subsequent circuit.

[0040] In some embodiments, please refer to Figure 2, the overvoltage protection circuit 2 includes a second transistor Q2 and a second diode D2. The second transistor Q2 is configured as follows: the first end is connected to the second end of the first transistor Q1, the second end is connected to the secondary clamping circuit 3, and the control end is connected to the second end of the first transistor Q1 via the second current limiting resistor Rb2 and the third current limiting resistor Rb3 in sequence; the second diode D2 is configured as follows: the cathode is connected to the control end of the second transistor Q2 via the second current limiting resistor Rb2, and the anode is connected to the second end of the first current limiting resistor Rb1.

[0041] In some examples, the second transistor Q2 includes a bipolar junction transistor (BJT).

[0042] In the embodiment of the present application, the overvoltage protection function of the second transistor Q2 and the second diode D2 is used to limit the first voltage provided by the first-stage clamping circuit 1, so that when the amplitude of the first voltage is greater than or equal to the preset threshold, a second voltage with an amplitude less than the preset threshold is generated, thereby achieving effective control of the battery output voltage and protecting the load in the subsequent circuit.

[0043] In some embodiments, please refer to Figure 2 The secondary clamp circuit 3 includes a third transistor Q3, a third diode D3, a fourth current limiting resistor Rb4 and a filter circuit 31. The third transistor Q3 is configured as follows: a first end is connected to the second end of the first transistor Q1, a second end is connected to the load, and a control end is connected to the second end of the second transistor Q2; the third diode D3 is configured as follows: a cathode is connected to the first end of the third transistor Q3, and an anode is connected to the control end of the third transistor Q3; the fourth current limiting resistor Rb4 is configured as follows: a first end is connected to the control end of the third transistor Q3, and a second end is connected to the anode of the second diode D2; the filter circuit 31 is located between the first end and the control end of the third transistor Q3.

[0044] In some examples, the third transistor Q3 includes a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) transistor.

[0045] By way of example, the third transistor Q3 may be a P-doped metal oxide semiconductor field effect transistor.

[0046] In the embodiment of the present application, the clamping function of the third transistor Q3 and the third diode D3 is used to limit the second voltage provided by the overvoltage protection circuit 2, so as to limit the amplitude of the target voltage (i.e., the input voltage of the load) generated by the secondary clamping circuit 3 to within a second preset range, and the second preset range is associated with the rated voltage of the load, thereby achieving effective control of the battery output voltage and ensuring the normal operation of the load in the subsequent circuit.

[0047] In some embodiments, please refer to Figure 2 , the filter circuit 31 includes a filter capacitor C and a filter resistor Rf. The filter capacitor C is configured as follows: a first end is connected to the first end of the third transistor Q3, and a second end is connected to the control end of the third transistor Q3; the filter resistor Rf is configured as follows: a first end is connected to the control end of the third transistor Q3, and a second end is connected to the control end of the third transistor Q3.

[0048] In the embodiment of the present application, a filter circuit 31 is provided in the second clamping circuit to suppress harmonics, suppress interference, alleviate three-phase imbalance, etc., thereby reducing the AC component in the pulsating DC voltage and retaining its DC component, so that the ripple factor of the target voltage (i.e., the input voltage of the load) generated by the secondary clamping circuit 3 is reduced, ensuring that the waveform of the target voltage is smooth, thereby improving the stability and reliability of the load operation.

[0049] In some embodiments, see Figure 1 or Figure 2 The conversion circuit 100 further includes a fuse F. The fuse F is configured as follows: a first end is connected to the positive electrode of the power source BT, and a second end is connected to the primary clamping circuit 1 .

[0050] For example, the appearance structure of the fuse F includes but is not limited to cylindrical, rectangular, flat, and wedge-shaped.

[0051] In the embodiment of the present application, a fuse F is provided between the power supply BT and the primary clamping circuit to promptly cut off the current when an abnormal situation such as overload or short circuit occurs in the circuit, thereby effectively protecting the subsequent circuit.

[0052] In the second aspect, the present application also provides a power supply according to some embodiments. The power supply includes a conversion circuit as described in the first aspect of the embodiment of the present application; the power supply is used to control the target voltage output by the power supply to the load RL so that the target voltage is associated with the rated voltage of the load RL. It should be noted that the power supply also has the technical advantages of the aforementioned conversion circuit, and the parts that are the same or corresponding to the above embodiments can refer to the corresponding description of the above embodiments, and will not be described in detail below.

[0053] In some embodiments, see Figure 1, the power supply includes a primary clamp circuit 1, an overvoltage protection circuit 2 and a secondary clamp circuit 3. The primary clamp circuit 1 is connected to the power supply; the primary clamp circuit 1 is used to receive the initial voltage provided by the power supply and generate a first voltage; the amplitude of the first voltage is within a first preset range. The overvoltage protection circuit 2 is connected to the primary clamp circuit 1; the overvoltage protection circuit 2 is used to generate a second voltage when the amplitude of the first voltage is greater than or equal to a preset threshold; the amplitude of the second voltage is less than the preset threshold; the secondary clamp circuit 3 is connected to both the overvoltage protection circuit 2 and the load RL; the secondary clamp circuit 3 is used to receive the second voltage and generate a target voltage; the amplitude of the target voltage is within a second preset range; the second preset range is associated with the rated voltage of the load RL.

[0054] In a third aspect, the present application also provides an electronic device according to some embodiments. The electronic device includes a housing and a conversion circuit as described in the first aspect of the embodiment of the present application; the conversion circuit is at least partially located in the accommodation space of the housing. It should be noted that the electronic device also has the technical advantages of the aforementioned conversion circuit, and the parts that are the same or corresponding to the above embodiments can refer to the corresponding description of the above embodiments, and will not be described in detail below.

[0055] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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.

[0056] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A conversion circuit, characterized in that: include: A primary clamping circuit, connected to a power source, configured to receive an initial voltage provided by the power source and generate a first voltage; The amplitude of the first voltage is within a first preset range; an overvoltage protection circuit, connected to the primary clamping circuit, for generating a second voltage when the amplitude of the first voltage is greater than or equal to a preset threshold; and the amplitude of the second voltage is less than the preset threshold; A secondary clamping circuit is connected to the overvoltage protection circuit and the load, and is used to receive the second voltage and generate a target voltage; the amplitude of the target voltage is within a second preset range; the second preset range is associated with the rated voltage of the load.

2. The conversion circuit according to claim 1, characterized in that: The primary clamping circuit comprises: A first transistor is configured as follows: a first end is connected to the positive electrode of the power supply, and a second end is connected to its control end via a first voltage-dividing resistor; A first diode is configured such that: a cathode is connected to the second end of the first transistor, and an anode is connected to the control end of the first transistor; The first current limiting resistor is configured as follows: a first end is connected to the second end of the first transistor, and a second end is connected to the negative electrode of the power supply.

3. The conversion circuit according to claim 2, characterized in that: The overvoltage protection circuit comprises: A second transistor is configured as follows: a first end is connected to the second end of the first transistor, a second end is connected to the secondary clamping circuit, and a control end is connected to the second end of the first transistor via a second current limiting resistor and a third current limiting resistor in sequence; The second diode is configured as follows: a cathode is connected to the control end of the second transistor via the second current limiting resistor, and an anode is connected to the second end of the first current limiting resistor.

4. The conversion circuit according to claim 3, characterized in that: The secondary clamping circuit comprises: A third transistor is configured as follows: a first terminal is connected to the second terminal of the first transistor, a second terminal is connected to the load, and a control terminal is connected to the second terminal of the second transistor; A third diode is configured such that: a cathode is connected to the first end of the third transistor, and an anode is connected to the control end of the third transistor; a fourth current limiting resistor, configured as follows: a first end connected to the control end of the third transistor, and a second end connected to the anode of the second diode; The filter circuit is located between the first terminal and the control terminal of the third transistor.

5. The conversion circuit according to claim 4, characterized in that: The filtering circuit comprises: A filter capacitor, configured as follows: a first end connected to the first end of the third transistor, and a second end connected to the control end of the third transistor; The filter resistor is configured as follows: a first end is connected to the control end of the third transistor, and a second end is connected to the control end of the third transistor.

6. The conversion circuit according to claim 1, characterized in that: Also includes: The fuse is configured as follows: a first end is connected to the positive electrode of the power supply, and a second end is connected to the primary clamping circuit.

7. The conversion circuit according to claim 1, characterized in that: The primary clamping circuit includes a first transistor, the secondary clamping circuit includes a third transistor; the first transistor includes a metal oxide semiconductor field effect transistor, and / or The third transistor includes a metal oxide semiconductor field effect transistor.

8. The conversion circuit according to claim 1, characterized in that: The overvoltage protection circuit includes a second transistor; the second transistor includes a bipolar junction transistor.

9. A power supply, characterized in that: include: The conversion circuit as claimed in any one of claims 1 to 8 is used to control the target voltage output by the power supply to the load so that the target voltage is associated with the rated voltage of the load.

10. An electronic device, characterized in that: include: case; The conversion circuit as claimed in any one of claims 1 to 8, wherein the conversion circuit is at least partially located in the accommodating space of the housing.

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