Novel triode anti-saturation circuit and switching power supply circuit
By designing a new type of transistor anti-saturation circuit, using the specific connection of multiple diodes and resistors, the problem of difficulty in taking into account the cost and stability of existing circuits is solved, and a more efficient and stable electronic equipment power circuit is achieved.
Patent Information
- Application Number
- CN202421160374.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-27
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2034-05-27
AI Technical Summary
The existing transistor anti-saturation circuit design is difficult to take into account product cost and operating stability, especially in electronic devices that are rapidly updated and iterative.
A new type of transistor anti-saturation circuit is designed, including transistors, multiple diodes and resistors. Through specific circuit connections and configurations, the saturation time of the transistor is reduced and the stability and efficiency of the circuit are improved.
The circuit circuit is simple and practical, reducing design and production costs, improving product stability and efficiency, and complying with safety and energy efficiency standards.
Smart Images
Figure CN222531538U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electronic equipment, in particular to a novel triode anti-saturation circuit and a switch power supply circuit. Background Art
[0002] With the rapid development of people's work and life towards intelligence, customers' demand for electronic products is getting higher and higher. Improving product performance and production capacity while ensuring that the overall cost of electronic products does not increase has always been an important part of meeting customer needs. Therefore, the design of electronic products, especially basic circuits such as switching power supply circuits and floating power supply circuits, puts forward higher requirements for staff. On the one hand, the design of complex circuits will increase the cost and volume of the product accordingly. On the other hand, overly simplified circuit design needs to consider whether it will affect the performance of the product.
[0003] In the application of various flyback switching power supplies within 100W, such as: small appliances, chargers and other electronic equipment power supply systems, the switching power supply circuits will use transistor anti-saturation circuits. The transistor anti-saturation circuit design in the prior art still adopts the traditional design method. With the rapid update and iteration of products, this method has been difficult to take into account both product cost and working stability. Utility Model Content
[0004] In order to solve the problem that the transistor anti-saturation circuit design in the above-mentioned prior art still adopts the traditional design method, which has been difficult to take into account the performance of both product cost and working stability with the rapid update and iteration of products, the embodiment of the utility model provides a new type of transistor anti-saturation circuit and switching power supply circuit. The specific technical solution is as follows:
[0005] In a first aspect of the embodiment of the utility model, a novel triode anti-saturation circuit is first provided, the circuit comprising: a triode, a first diode, a second diode, a third diode, a fourth diode and a resistor;
[0006] The base of the transistor is connected to the negative end of the third diode, the positive end of the fourth diode and the resistor, the collector of the transistor is connected to the negative end of the first diode, the voltage supply end is connected to the first diode, the positive end of the second diode and the negative end of the fourth diode, the negative end of the second diode is connected to the positive end of the third diode, and the emitter of the transistor and the other end of the resistor are grounded.
[0007] In a second aspect of the embodiments of the utility model, a switching power supply circuit is provided, wherein the switching power supply circuit includes the novel triode anti-saturation circuit described in the first aspect.
[0008] The technical solution provided by the embodiment of the utility model, the new type of triode anti-saturation circuit includes: a triode, a first diode, a second diode, a third diode, a fourth diode and a resistor; wherein the base of the triode is connected to the negative end of the third diode, the positive end of the fourth diode and the resistor, the collector of the triode is connected to the negative end of the first diode, the voltage supply end is connected to the first diode, the positive end of the second diode and the negative end of the fourth diode, the negative end of the second diode is connected to the positive end of the third diode, the emitter of the triode and the other end of the resistor are grounded, in this embodiment, the anti-saturation diode is connected to the switch triode for use, which can reduce the storage time; the circuit is simple and practical, the protection effect is good, and the product stability performance is improved. Thus, the positive effects of high practicality, low design cost and production cost, and more efficient products are achieved. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.
[0010] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.
[0011] Figure 1 This is a schematic diagram of a novel triode saturation circuit structure shown in an embodiment of the utility model;
[0012] Among them, the labels are as follows: transistor Q1, first diode D1, second diode D2, third diode D3, fourth diode D4, resistor R1. DETAILED DESCRIPTION
[0013] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0014] In the prior art, in the application of various flyback switching power supplies within 100W, such as: small household appliances, chargers and other electronic equipment power supply systems, the triode anti-saturation circuit of the switching power supply circuit has always used the traditional design method. With the rapid update and iteration of products, this method has been difficult to take into account both product cost and working stability. Based on this, the embodiment of the present application provides a new type of triode anti-saturation circuit, and the following is a detailed introduction to this solution through specific embodiments.
[0015] Figure 1 FIG. 1 is a schematic diagram of a novel triode saturation circuit structure shown in an embodiment of the utility model, referring to FIG. Figure 1 The novel transistor anti-saturation circuit provided in this embodiment includes: a transistor Q1, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4 and a resistor R1.
[0016] In a specific example, the base of the transistor Q1 is connected to the negative end of the third diode D3, the positive end of the fourth diode D4 and the resistor R1, the collector of the transistor Q1 is connected to the negative end of the first diode D1, the voltage supply terminal VCC is connected to the first diode D1, the positive end of the second diode D2 and the negative end of the fourth diode D4, the negative end of the second diode D2 is connected to the positive end of the third diode D3, and the emitter of the transistor Q1 and the other end of the resistor R1 are grounded.
[0017] In this embodiment, the anti-saturation diode in this circuit is connected to the switching transistor for use, which can reduce the storage time.
[0018] Specific reference Figure 1 In the embodiment shown, when VCC is supplied, the forward bias of the second diode D2 and the third diode D3 will produce a voltage drop, so the input terminal potential will increase the base terminal potential of the transistor Q1. Assuming that the forward bias of the second diode D2 and the third diode D3 is 0.8V, the base terminal voltage of the transistor Q1 is higher than the voltage drop of 1.6V. Since the collector terminal of the transistor Q1 is connected to the first diode D1, the input terminal will be 0.8V higher than the collector terminal of the transistor Q1. Therefore, the collector voltage of the transistor Q1 is greater than the base terminal voltage and is a positive value, and its value is 1.6V-0.8V=0.8V. It can be concluded that the transistor Q1 is not in a saturated state. Since the transistor works at a high frequency, the anti-saturation diode must use a fast recovery tube. The reverse voltage of the second diode D2 and the third diode D3 can use a relatively small voltage drop, but the first diode D1 must use a relatively high voltage drop. The fourth diode D4 is used as the transistor Q1 In the OFF state, the reverse base current is drawn, and the capacitors at the base and emitter ends of the transistor Q1 are discharged, which can reduce the storage time and the purpose is to make the transistor unsaturated.
[0019] The embodiment provides a novel triode anti-saturation circuit, which has a simple and practical circuit, reduces design costs, improves product efficiency, and complies with safety regulations and energy efficiency standards.
[0020] In another embodiment of the present application, a switching power supply circuit is provided. The switching power supply circuit includes the novel transistor anti-saturation circuit as described in any of the above embodiments.
[0021] The switching power supply circuit provided in this embodiment adopts the above-mentioned novel triode anti-saturation circuit, which also has the advantages of being simple and practical, having good protection effect, and improving product stability performance.
[0022] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.
[0023] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.
[0024] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims
1. A novel triode anti-saturation circuit, characterized in that: The circuit comprises: a triode, a first diode, a second diode, a third diode, a fourth diode and a resistor; The base of the transistor is connected to the negative end of the third diode, the positive end of the fourth diode and the resistor; the collector of the transistor is connected to the negative end of the first diode, the voltage supply end is connected to the first diode, the positive end of the second diode and the negative end of the fourth diode, the negative end of the second diode is connected to the positive end of the third diode; the emitter of the transistor and the other end of the resistor are grounded.
2. A switching power supply circuit, characterized in that: The switching power supply circuit includes the novel triode anti-saturation circuit described in claim 1.