Negative voltage driving circuit
By designing a negative voltage driving circuit in the power circuit and using the IGBT's intergeal parallel voltage stabilization tube, the risk of misdirection of the power tube is reduced, the misdirection problem caused by crosstalk voltage is solved, and the circuit stability and cost reduction are achieved.
Patent Information
- Application Number
- CN202420588202.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-26
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-03-26
AI Technical Summary
The crosstalk voltage that occurs during power tube driving in power circuits causes an increase in the risk of misdirection. In the prior art, adjusting the driving parameters or adding negative voltage circuits is the solution, but adding negative voltage circuits is more conducive to improving circuit stability and reducing misunderstandings. Pass the risk.
A negative voltage driving circuit is designed to connect the voltage stabilization tube in parallel between the IGBT, and input the drive resistor series capacitor at a high level, and the voltage across the capacitor at a low level is negative, reducing the risk of misdirection of the power tube.
The negative voltage circuit is simple in structure and low in cost, which significantly reduces the risk of misdirection of power tubes and effectively solves the misdirection problem caused by crosstalk voltage in the power circuit.
Smart Images
Figure CN222234676U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of drive circuits, in particular to a negative pressure drive circuit. Background Art
[0002] With the rapid development of power electronics technology, power converters are developing towards high power density and high efficiency. With the rapid development of technology, the power circuits used in switching power supplies have put forward stringent requirements on the performance of devices. In the power circuit, the power tube often has crosstalk voltage spikes during the on-off process, which greatly increases the risk of mis-conduction and damage to the power tube. In response to this problem, there are generally two ways to deal with it in the industry. One is to adjust the drive parameters to reduce the drive crosstalk spikes, and the other is to add a negative voltage circuit. Compared with adjusting the drive parameters, adding a negative voltage circuit is more conducive to improving the stability of the circuit and can effectively reduce the risk of mis-conduction of the power tube.
[0003] Therefore, it is necessary to provide a negative voltage driving circuit to solve the problem of mis-conduction caused by crosstalk voltage in the process of driving the power tube in the power circuit. Utility Model Content
[0004] The utility model discloses a negative voltage driving circuit, belongs to the field of switching power supplies, and relates to a circuit for reducing the risk of mis-conduction of a driving switching circuit, which can effectively solve the technical problems involved in the background technology.
[0005] To achieve the above purpose, the technical solution of the utility model is:
[0006] A negative voltage driving circuit comprises an input port PWM1, wherein the input port PWM1 is connected to one end of a resistor R145 and a negative end of a diode D15, the positive end of the diode D15 is connected to one end of a resistor R46, the other end of the resistor R145 is connected to the other end of the resistor R46, one end of a resistor R13 and one end of a capacitor C28, the other end of the resistor R13 is connected to the other end of the capacitor C28, the cathode of a voltage regulator tube Z3 and one end of a resistor R27, the anode of the voltage regulator tube Z3 is connected to the positive end of a diode D5, the other end of the resistor R27 is connected to the negative end of the diode D5 and a port INVGND1, one end of the resistor R27 is connected to the control electrode of a switch tube Q18, and the other end of the resistor R27 is connected to the emitter of the switch tube Q18.
[0007] When the power tube drive input is high level, the driving resistor is connected in series with a pair of resistors and capacitors, and a voltage regulator is connected in parallel between the ge of the IGBT to make a stable voltage exist at both ends of the capacitor; when the drive input is low level, since the voltage across the capacitor cannot suddenly change, the voltage at the g pole is the negative value of the previous capacitor voltage, which can reduce the risk of misconduction of the power tube.
[0008] As a preferred improvement of the present invention: the switch tube Q18 is an IGBT.
[0009] As a preferred improvement of the present invention: the input port PWM1 is connected to a controller.
[0010] As a preferred improvement of the present invention: the controller is a single chip microcomputer.
[0011] As a preferred improvement of the present utility model: the collector of the switch tube Q18 is connected to the port DC+ and the collector of the switch tube Q30, the emitter of the switch tube Q18 is connected to the collector of the switch tube Q12 and one end of the inductor L1, the other end of the inductor L1 is connected to one end of the capacitor C4 and the port AC_L, the emitter of the switch tube Q30 is connected to the collector of the switch tube Q22, the other end of the capacitor C4 and the port AC_N, and the emitter of the switch tube Q12 and the emitter of the switch tube Q22 are connected to the port GND.
[0012] As a preferred improvement of the present invention: the switch tube Q12, the switch tube Q18, the switch tube Q22 and the switch tube Q30 are of model JT020N065CED.
[0013] As a preferred improvement of the present invention: the resistance value of the resistor R145 is 39R, the resistance value of the resistor R46 is 33R, the resistance value of the resistor R13 is 1.8K, and the resistance value of the resistor R27 is 100K.
[0014] As a preferred improvement of the present utility model: the specification of the voltage regulator tube Z3 is 12V.
[0015] The beneficial effects of the utility model are as follows:
[0016] The negative voltage circuit has a simple structure and low cost. It can provide a negative voltage to the power tube in the off state, significantly reducing the risk of mis-conduction of the power tube, and solving the problem of mis-conduction caused by crosstalk voltage in the power tube driving process in the power circuit. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:
[0018] Figure 1 It is a schematic diagram of a negative pressure driving circuit of the utility model;
[0019] Figure 2 A schematic diagram for circuit application. DETAILED DESCRIPTION
[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in combination with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0021] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0022] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0023] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0024] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.
[0025] See also Figure 1As shown, the utility model provides a negative voltage driving circuit, including an input port PWM1, wherein the input port PWM1 is connected to one end of a resistor R145 and a negative end of a diode D15, the positive end of the diode D15 is connected to one end of a resistor R46, the other end of the resistor R145 is connected to the other end of the resistor R46, one end of a resistor R13 and one end of a capacitor C28, the other end of the resistor R13 is connected to the other end of the capacitor C28, the cathode of a voltage regulator tube Z3 and one end of a resistor R27, the anode of the voltage regulator tube Z3 is connected to the positive end of a diode D5, the other end of the resistor R27 is connected to the negative end of the diode D5 and a port INVGND1, one end of the resistor R27 is connected to the control electrode (gate G) of a switch tube Q18, and the other end of the resistor R27 is connected to the emitter (E) of the switch tube Q18. In this embodiment, the switch tube Q18 is an IGBT, the input port PWM1 is connected to the controller, the controller is a single-chip microcomputer, the resistance value of the resistor R145 is 39R, the resistance value of the resistor R46 is 33R, the resistance value of the resistor R13 is 1.8K, the resistance value of the resistor R27 is 100K, and the specification of the voltage regulator tube Z3 is 12V.
[0026] When PWM1 inputs a high level, since the voltage across C28 cannot suddenly change, Q18 is driven through the R145 and C28 loops at the first time, the voltage division of R27 is greater than the working voltage of the voltage regulator tube, the voltage regulator tube Z3 works, the Vge of the IGBT is equal to the voltage regulator tube voltage plus the conduction voltage of the diode D5, and the voltage on C28 is equal to the driving input voltage minus Vge and the voltage division on R145. When PWM1 inputs a low level, the voltage at the G point of the IGBT is negative because the voltage across the capacitor C28 cannot suddenly change, and the absolute value decreases as C28 discharges the resistor R13. Therefore, the circuit of the utility model is suitable for high-frequency switching circuits, and the negative voltage circuit has a simple structure and low cost, and can provide a negative voltage to the power tube in the off state, significantly reducing the risk of mis-conduction of the power tube.
[0027] See also Figure 2 As shown, Figure 2The circuit diagram of the negative voltage driving circuit is shown in the figure. The collector of the switch tube Q18 is connected to the DC+ port and the collector of the switch tube Q30. The emitter of the switch tube Q18 is connected to the collector of the switch tube Q12 and one end of the inductor L1. The other end of the inductor L1 is connected to one end of the capacitor C4 and the port AC_L. The emitter of the switch tube Q30 is connected to the collector of the switch tube Q22, the other end of the capacitor C4 and the port AC_N. The emitter of the switch tube Q12 and the emitter of the switch tube Q22 are connected to the port GND. The models of the switch tubes Q12, Q18, Q22 and Q30 are JT020N065CED. The gates and emitters of the switch tubes Q12, Q22 and Q30 can also be connected. Figure 1 The circuit of the structure shown is used for the driving signal input of the switch tube. When the power tube driving input is high level, the driving resistor is connected in series with a pair of resistors and capacitors. A voltage regulator tube is connected in parallel between the ge of the IGBT so that a stable voltage exists at both ends of the capacitor. When the driving input is low level, since the voltage at both ends of the capacitor cannot change suddenly, the voltage at the g pole is the negative value of the previous capacitor voltage, which can reduce the risk of mis-conduction of the power tube. It needs to be further explained that the use of other components to achieve the above effects should all fall within the inventive concept of the utility model and should fall within the protection scope of the utility model.
[0028] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and the implementation scheme. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.
Claims
1. A negative voltage driving circuit, characterized in that: It includes an input port PWM1, wherein the input port PWM1 is connected to one end of a resistor R145 and a negative end of a diode D15, the positive end of the diode D15 is connected to one end of a resistor R46, the other end of the resistor R145 is connected to the other end of the resistor R46, one end of a resistor R13 and one end of a capacitor C28, the other end of the resistor R13 is connected to the other end of the capacitor C28, the cathode of a voltage-stabilizing tube Z3 and one end of a resistor R27, the anode of the voltage-stabilizing tube Z3 is connected to the positive end of a diode D5, the other end of the resistor R27 is connected to the negative end of the diode D5 and a port INVGND1, one end of the resistor R27 is connected to the control electrode of a switch tube Q18, and the other end of the resistor R27 is connected to the emitter of the switch tube Q18.
2. A negative voltage driving circuit according to claim 1, characterized in that: The switch tube Q18 is an IGBT.
3. A negative voltage driving circuit according to claim 1, characterized in that: The input port PWM1 is connected to the controller.
4. A negative voltage driving circuit according to claim 3, characterized in that: The controller is a single chip microcomputer.
5. The negative voltage driving circuit according to claim 1, characterized in that: The collector of the switch tube Q18 is connected to the port DC+ and the collector of the switch tube Q30, the emitter of the switch tube Q18 is connected to the collector of the switch tube Q12 and one end of the inductor L1, the other end of the inductor L1 is connected to one end of the capacitor C4 and the port AC_L, the emitter of the switch tube Q30 is connected to the collector of the switch tube Q22, the other end of the capacitor C4 and the port AC_N, and the emitter of the switch tube Q12 and the emitter of the switch tube Q22 are connected to the port GND.
6. A negative voltage driving circuit according to claim 5, characterized in that: The switch tube Q12, the switch tube Q18, the switch tube Q22 and the switch tube Q30 are of model JT020N065CED.
7. The negative voltage driving circuit according to claim 1, characterized in that: The resistance value of the resistor R145 is 39R, the resistance value of the resistor R46 is 33R, the resistance value of the resistor R13 is 1.8K, and the resistance value of the resistor R27 is 100K.
8. The negative voltage driving circuit according to claim 1, characterized in that: The specification of the voltage regulator tube Z3 is 12V.