Totem driving circuit based on driving power type switch MOS tube

Abstract

The utility model discloses a totem driving circuit based on a driving power type switch MOS tube, and relates to the technical field of electronic circuits. The totem driving circuit based on the driving power type switch MOS tube comprises a PWM signal input, an enhancement circuit and a driving transformer T1, the PWM signal input comprises a single-chip microcontroller, two paths of PWM outputs of the single-chip microcontroller are PWM1 and PWM2, and target dead time is set in the single-chip microcontroller; the enhancement circuit is connected with PWM signal input and comprises a first-stage enhancement circuit, a second-stage enhancement circuit and a third-stage enhancement circuit which are connected in sequence, the first-stage enhancement circuit, the second-stage enhancement circuit and the third-stage enhancement circuit are used for enhancing PWM signals, and the third-stage enhancement circuit is connected with a capacitor C1 and generates PWM waveforms through the capacitor C1; and the driving transformer T1 is connected with the capacitor C1 and is used for coupling and converting the PWM waveform into a strong driving PWM signal and realizing high-voltage isolation driving. The totem drive circuit provided by the utility model is used for adapting to MOS tubes with different types of power.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic circuit technical field especially, and it relates to a totem pole drive circuit based on driving power type switch MOS pipe. BACKGROUND

[0002] In the application field of ultraviolet lamp electronic ballast and other gas discharge lamp electronic ballast and switching power supply, half bridge type switching power supply architecture is often adopted, which needs to drive two high-voltage and high-current MOS tubes to form a half bridge circuit, wherein the upper bridge arm MOS of the half bridge circuit needs to be driven by high-voltage floating. The traditional way is to use high-voltage floating drive chip, such as IRS21XX series, L63XX series, etc. However, such chips have the problems of high price and indefinite delivery time, and improper debugging can easily burn the power MOS and high-voltage drive chip. SUMMARY

[0003] The utility model discloses a totem pole drive circuit based on driving power type switch MOS pipe, which is used to solve the problems of high cost, low reliability and difficult debugging caused by high-voltage floating drive chip in the prior art.

[0004] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0005] A totem pole drive circuit based on driving power type switch MOS pipe, comprising:

[0006] A PWM signal input, including a single-chip microcontroller, two-way PWM output of the single-chip microcontroller has PWM1 and PWM2, and the single-chip microcontroller is internally provided with a target dead time;

[0007] An enhancement circuit, which is connected with the PWM signal input, comprises a first-stage enhancement circuit, a second-stage enhancement circuit and a third-stage enhancement circuit connected in sequence, and the first-stage enhancement circuit, the second-stage enhancement circuit and the third-stage enhancement circuit are used for enhancing the PWM signal, the third-stage enhancement circuit is connected with a capacitor C1, and a PWM waveform is generated through the capacitor C1;

[0008] A drive transformer T1, which is connected with the capacitor C1, is used for coupling and converting the PWM waveform into a strong drive PWM signal and realizing high-voltage isolation driving.

[0009] Optionally, the totem pole drive circuit further comprises an upper bridge arm MOS and a lower bridge arm MOS connected with the secondary side of the drive transformer T1, and the upper bridge arm MOS and the lower bridge arm MOS are used for driving a high-voltage MOS switch tube with large current.

[0010] Optionally, the target dead time is used to ensure that the upper bridge arm MOS and the lower bridge arm MOS can be turned on alternately.

[0011] Optionally, the first-stage enhancement circuit comprises a triode Q1, a triode Q2 and a triode Q3 connected with the PWM1, and a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a resistor R5 connected with the triode Q1, the triode Q2 and the triode Q3, and the first-stage enhancement circuit is used to output a first-stage enhanced PWM signal.

[0012] Optionally, the second-stage enhancement circuit comprises a triode Q4 and a triode Q5 connected with the output of the first-stage enhancement circuit, and a resistor R6 connected with the triode Q4 and the triode Q5, and the first-stage enhanced PWM signal drives a totem push-pull circuit composed of the triode Q4 and the triode Q5 through the resistor R6 to output a second-stage enhanced PWM signal.

[0013] Optionally, the third-stage enhancement circuit comprises a triode Q6 connected with the output of the second-stage enhancement circuit, and a resistor R7, a resistor R8 and a resistor R9, and the second-stage enhanced PWM signal drives the triode Q6 to output a PWM waveform on the capacitor C1.

[0014] Optionally, the totem drive circuit further comprises a diode D1 and a diode D2, the diode D1 is arranged between the second-stage enhancement circuit and the third-stage enhancement circuit, the diode D2 is arranged between the third-stage enhancement circuit and the drive transformer T1, and the diode D1 and the diode D2 are used to protect the circuit.

[0015] Compared with the prior art, the totem drive circuit based on the driving power type switching MOS tube provided by the utility model has the advantages that on the one hand, the cost is effectively reduced, the high-voltage suspension drive chip (such as IRS21XX series, L63XX series, etc.) which is high in price and uncertain in delivery time can not be used, the circuit cost is significantly reduced and good reliability is achieved, the problem of burning the power MOS and the high-voltage drive chip which is prone to occur due to improper debugging is avoided, the reliability and stability of the circuit are improved, and the debugging is simple, compared with the traditional circuit using the high-voltage suspension drive chip, the debugging is easier, and the debugging difficulty and workload are reduced, on the other hand, the totem drive circuit provided by the application has a wide application range and is suitable for the fields of ultraviolet lamp electronic ballasts, electronic ballasts of other gas discharge lamps and switching power supplies, has a wide application prospect and market value, can meet the demand for high-voltage isolation driving of large power in different scenes, and can match the high-voltage MOS switching tube of various types of large current by properly adjusting the parameters of each stage, thereby enhancing the universality and adaptability of the circuit. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

[0017] Figure 1 A structure schematic diagram of the totem driving circuit provided for the embodiments of the application.

[0018] Reference signs:

[0019] 1 - first stage enhancement circuit; 2 - second stage enhancement circuit; 3 - third stage enhancement circuit. DETAILED DESCRIPTION

[0020] In order to make the technical problems to be solved by the application, the technical solutions and the beneficial effects clearer, the application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the application and should not be used to limit the application.

[0021] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an implied indication of the number of technical features indicated. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "multiple" is two or more, unless otherwise explicitly and specifically limited. The meaning of "several" is one or more, unless otherwise explicitly and specifically limited.

[0022] Please refer to Figure 1 The totem driving circuit based on the driving power type switch MOS tube provided by the embodiments of the application comprises a PWM signal input, an enhancement circuit and a driving transformer T1, wherein the PWM signal input comprises a single-chip microcontroller, two-way PWM outputs of the single-chip microcontroller are PWM1 and PWM2, and the single-chip microcontroller is internally provided with a target dead time; the enhancement circuit is connected with the PWM signal input, the enhancement circuit comprises a first stage enhancement circuit 1, a second stage enhancement circuit 2 and a third stage enhancement circuit 3 connected in sequence, the first stage enhancement circuit 1, the second stage enhancement circuit 2 and the third stage enhancement circuit 3 are used for enhancing the PWM signal, the third stage enhancement circuit 3 is connected with a capacitor C1, and the third stage enhancement circuit 3 generates a PWM waveform through the capacitor C1; the driving transformer T1 is connected with the capacitor C1, and the driving transformer T1 is used for coupling and converting the PWM waveform into a strong driving PWM signal and realizing high-voltage isolation driving.

[0023] In the application, the totem drive circuit further comprises an upper bridge arm MOS and a lower bridge arm MOS connected with the secondary side of the drive transformer T1, and the upper bridge arm MOS and the lower bridge arm MOS are used to drive high-voltage MOS switches with large current.

[0024] It should be noted that the target dead time is used to ensure that the upper bridge arm MOS and the lower bridge arm MOS can be alternately turned on.

[0025] In the application, the first-stage enhancement circuit 1 comprises a triode Q1, a triode Q2 and a triode Q3 connected with the PWM1, and a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a resistor R5 connected with the triode Q1, the triode Q2 and the triode Q3, and the first-stage enhancement circuit 1 is used to output a first-stage enhanced PWM signal.

[0026] In the application, the second-stage enhancement circuit 2 comprises a triode Q4 and a triode Q5 connected with the output of the first-stage enhancement circuit 1, and a resistor R6 connected with the triode Q4 and the triode Q5, and the first-stage enhanced PWM signal drives a totem push-pull circuit composed of the triode Q4 and the triode Q5 through the resistor R6, and outputs a second-stage enhanced PWM signal.

[0027] In the application, the third-stage enhancement circuit 3 comprises a triode Q6 connected with the output of the second-stage enhancement circuit 2, and a resistor R7, a resistor R8 and a resistor R9, and the second-stage enhanced PWM signal drives the triode Q6, and a PWM waveform is output on a capacitor C1.

[0028] Optionally, the totem drive circuit further comprises a diode D1 and a diode D2, the diode D1 is arranged between the second-stage enhancement circuit 2 and the third-stage enhancement circuit 3, the diode D2 is arranged between the third-stage enhancement circuit 3 and the drive transformer T1, and the diode D1 and the diode D2 are used to protect the circuit.

[0029] Working principle:

[0030] Signal input and dead zone setting: the two-way PWM signals on the left side of the circuit are derived from the output of a single-chip microcontroller, and the target dead time is set in the MCU program to ensure that the half-bridge MOS can be alternately turned on reliably.

[0031] First-stage enhancement circuit 1: the PWM1 (VPP square wave of about 5V) drives the triode Q1, the square wave voltage VPP through the triode Q1 is close to VCC, the C pole of the triode Q1 outputs to drive the triode Q2, and at the same time, the PWM1 drives the triode Q3, and the first-stage enhanced PWM signal is obtained at the E pole of the triode Q2 and the C pole of the triode Q3.

[0032] The second stage enhanced circuit 2: the first stage enhanced PWM signal drives the totem push-pull circuit composed of the triode Q4 and the triode Q5 through the resistor R6, and the second stage enhanced PWM signal is obtained on the resistor R7.

[0033] The third stage enhanced circuit 3 is coupled with the transformer: the second stage enhanced PWM signal drives the triode Q6, and the steep PWM waveform is obtained on the capacitor C1, the waveform reaches the primary of the driving transformer T1 through the capacitor C1, the strong driving PWM signal is obtained through the transformer coupling, and high-voltage isolation driving is realized.

[0034] The driving half-bridge MOS: the two-way third stage enhanced PWM totem driving circuits work simultaneously, can drive the upper bridge arm MOS and the lower bridge arm MOS of the half-bridge circuit, and can match driving various high-current high-voltage MOS switch tubes by adjusting the parameters of the stages, so that high-power high-voltage isolation driving is realized.

[0035] It can be known from the structure and working principle of the totem driving circuit that on the one hand, the cost is effectively reduced, the high-voltage suspension driving chip (such as the IRS21XX series, the L63XX series, etc.) with high price and uncertain delivery time can not be used, the circuit cost is significantly reduced, and good reliability is obtained, the problem of burning power MOS and high-voltage driving chip caused by improper debugging is avoided, the reliability and stability of the circuit are improved, and the debugging is simple, compared with the traditional circuit using the high-voltage suspension driving chip, the debugging is easier, the debugging difficulty and workload are reduced, on the other hand, the totem driving circuit provided by the application has a wide application range, is suitable for ultraviolet lamp electronic ballasts, electronic ballasts of other gas discharge lamps and switching power supplies and the like, has wide application prospect and market value, can meet the demand for high-power high-voltage isolation driving in different scenes, and can match driving various types of high-current high-voltage MOS switch tubes by properly adjusting the parameters of the stages, so that the versatility and adaptability of the circuit are enhanced.

[0036] In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0037] The above is only a specific implementation manner of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the technical field can easily think of changes or replacements within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of the claims.

Claims

1. A totem pole driving circuit based on driving power type switching MOSFET, characterized by, The totem drive circuit comprises a PWM signal input, a single-chip microcontroller, two-way PWM output of the single-chip microcontroller, PWM1 and PWM2, and a target dead time set in the single-chip microcontroller. An enhancement circuit is connected with the PWM signal input, and comprises a first-stage enhancement circuit, a second-stage enhancement circuit and a third-stage enhancement circuit connected in sequence, and the first-stage enhancement circuit, the second-stage enhancement circuit and the third-stage enhancement circuit are used for enhancing the PWM signal, the third-stage enhancement circuit is connected with a capacitor C1, and a PWM waveform is generated through the capacitor C1. A drive transformer T1 is connected with the capacitor C1, and the drive transformer T1 is used for coupling and converting the PWM waveform into a strong drive PWM signal and realizing high-voltage isolation driving. The totem drive circuit further comprises an upper bridge arm MOS and a lower bridge arm MOS connected with a secondary side of the drive transformer T1, and the upper bridge arm MOS and the lower bridge arm MOS are used for driving a high-voltage MOS switch tube with large current.

2. The totem pole drive circuit based on driving power type switching MOSFETs according to claim 1, wherein, The target dead time is used for ensuring that the upper bridge arm MOS and the lower bridge arm MOS can be alternately turned on.

3. The totem pole drive circuit based on driving power type switching MOSFETs according to claim 2, wherein The first-stage enhancement circuit comprises a triode Q1, a triode Q2 and a triode Q3 connected with the PWM1, and a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a resistor R5 connected with the triode Q1, the triode Q2 and the triode Q3, and the first-stage enhancement circuit is used for outputting a first-stage enhanced PWM signal.

4. The drive power type switch MOS transistor-based totem pole driving circuit according to claim 1, wherein The second-stage enhancement circuit comprises a triode Q4 and a triode Q5 connected with the first-stage enhancement circuit output, and a resistor R6 connected with the triode Q4 and the triode Q5, and the first-stage enhanced PWM signal drives a totem push-pull circuit composed of the triode Q4 and the triode Q5 through the resistor R6, and outputs a second-stage enhanced PWM signal.

5. The drive power type switch MOS transistor-based totem pole driving circuit according to claim 4, wherein The third-stage enhancement circuit comprises a triode Q6 connected with the second-stage enhancement circuit output, and a resistor R7, a resistor R8 and a resistor R9, and the second-stage enhanced PWM signal drives the triode Q6, and a PWM waveform is output on the capacitor C1.

6. The drive power type switch MOS transistor-based totem pole driving circuit according to claim 5, wherein The totem drive circuit further comprises a diode D1 and a diode D2, the diode D1 is arranged between the second-stage enhancement circuit and the third-stage enhancement circuit, the diode D2 is arranged between the third-stage enhancement circuit and the drive transformer T1, and the diode D1 and the diode D2 are used for protecting the circuit.

7. The drive power type switch MOS transistor-based totem pole drive circuit according to claim 6, wherein ​

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