CN221177565U - Asymmetric half-bridge driving circuit - Google Patents
Asymmetric half-bridge driving circuit Download PDFInfo
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- CN221177565U CN221177565U CN202322811401.2U CN202322811401U CN221177565U CN 221177565 U CN221177565 U CN 221177565U CN 202322811401 U CN202322811401 U CN 202322811401U CN 221177565 U CN221177565 U CN 221177565U
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- 239000003990 capacitor Substances 0.000 claims description 17
- 230000000087 stabilizing effect Effects 0.000 claims description 15
- 238000002955 isolation Methods 0.000 description 7
- 230000000295 complement effect Effects 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
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- 230000035699 permeability Effects 0.000 description 1
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Abstract
The utility model relates to the technical field of power tube driving, and provides an asymmetric half-bridge driving circuit, which comprises a first driving circuit, a transformer T1 and a second driving circuit, wherein the input end of the first driving circuit is used for receiving a control signal, the output end of the first driving circuit is connected with the input end of the transformer T1, the output end of the transformer T1 is connected with the input end of the second driving circuit, and the output end of the second driving circuit is used for driving a power tube; through the technical scheme, the problem that the output voltage of the asymmetric half-bridge driving circuit in the related art is not adjustable is solved.
Description
Technical Field
The utility model relates to the technical field of power tube driving, in particular to an asymmetric half-bridge driving circuit.
Background
Along with the development of power electronics technology to high frequency and high power density, fully-controlled power elements have become the main stream of high-power supplies, and especially the advantages of high frequency, high voltage, large current, low saturation voltage drop, simple driving circuit form and the like of IGBTs and MOSFETs have become the preferred devices of the power elements of the high-power supplies.
The switching characteristics of the high power switching tube are closely related to the performance of the driving circuit. The driving circuit with excellent design can improve the switching characteristic of the power switching tube, thereby reducing the switching loss and improving the efficiency of the whole machine and the working reliability of the power device. The driving circuits of the high-power switch tube have various forms, and are mainly divided into a non-isolated direct driving type and an isolated type driving circuit, wherein the isolated type driving circuit is divided into: electromagnetic isolation, photoelectric isolation, capacitive coupling. The electromagnetic isolation driving method comprises the following steps: the full-bridge totem pole driving circuit is suitable for different application occasions in various circuit forms such as forward isolation driving, full-bridge totem pole isolation driving, asymmetric half-bridge driving and the like. The asymmetric half-bridge driving circuit has the advantages of simple circuit topology, single power supply, capability of outputting bipolar driving voltage, flexible output voltage lifting, easiness in multiplexing output and the like, and is widely used. Although a bipolar drive signal can be output. But has the disadvantage that the positive and negative voltages are equal and not adjustable.
Disclosure of utility model
The utility model provides an asymmetric half-bridge driving circuit, which solves the problem that the output voltage of the asymmetric half-bridge driving circuit in the related art is not adjustable.
The technical scheme of the utility model is as follows:
The asymmetric half-bridge driving circuit comprises a first driving circuit, a transformer T1 and a second driving circuit, wherein the input end of the first driving circuit is used for receiving a control signal, the output end of the first driving circuit is connected with the input end of the transformer T1, the output end of the transformer T1 is connected with the input end of the second driving circuit, and the output end of the second driving circuit is used for driving a power tube;
The second driving circuit comprises a diode D3, a diode D4, a capacitor C2, a capacitor C3, a triode Q4 and a voltage stabilizing tube Z3, wherein the anode of the diode D3 is connected with the first output end of the transformer T1, the first output end of the transformer T1 is connected with the base electrode of the triode Q3, the base electrode of the triode Q3 is connected with the base electrode of the triode Q4, and the second output end of the transformer T1 is used for being connected with the source electrode of a driven power tube;
The negative pole of diode D3 passes through electric capacity C2 connects the second output of transformer T1, diode D3's negative pole is connected triode Q3's collecting electrode, triode Q3's projecting pole is used for connecting the grid of driven power tube, triode Q3's projecting pole is connected triode Q4's projecting pole, triode Q4's collecting electrode passes through electric capacity C3 connects transformer T1's second output, triode Q4's collecting electrode is connected diode D4's positive pole, diode D4's negative pole is connected transformer T1's first output.
Further, the second driving circuit in the present utility model further includes a voltage regulator tube Z1 and a voltage regulator tube Z2, wherein an anode of the voltage regulator tube Z1 is connected to the first output end of the transformer T1, a cathode of the voltage regulator tube Z1 is connected to the cathode of the voltage regulator tube Z2, and an anode of the voltage regulator tube Z2 is connected to the second output end of the transformer T1.
Further, in the present utility model, the first driving circuit includes a switching tube Q1 and a switching tube Q2, where a control end of the switching tube Q1 is configured to receive a PWM control signal, a control end of the switching tube Q1 is connected to a control end of the switching tube Q2, a first end of the switching tube Q1 is connected to a VCC power supply, a second end of the switching tube Q1 is connected to a first end of the switching tube Q2, a second end of the switching tube Q2 is grounded, a second end of the switching tube Q1 is connected to a first input end of the transformer T1, and a second input end of the transformer T1 is grounded.
Further, in the present utility model, the first driving circuit further includes a capacitor C1, where a first end of the capacitor C1 is connected to the second end of the switching tube Q1, and a second end of the capacitor C1 is connected to the first input end of the transformer T1.
The working principle and the beneficial effects of the utility model are as follows:
In the utility model, the asymmetric half-bridge driving circuit is used for driving the power tube, and the working principle of the asymmetric half-bridge driving circuit is as follows: the input end of the first driving circuit is used for receiving a PWM control signal output by the power management chip or the digital MCU, the first driving circuit is used for improving the driving capability of the signal of the input end, the input signal is added to the input end of the transformer T1 after passing through the first driving circuit, in the embodiment, the transformer T1 is a high-frequency isolation transformer, an asymmetrically complementary alternating signal is generated at the input end of the transformer T1, an asymmetrically complementary alternating signal is also generated at the output end of the transformer T1, and the output voltage amplitude of the transformer T1 is related to the turn ratio of the transformer and the duty ratio of the PWM control signal. The voltage signal at the output end of the transformer T1 is changed into a direct current signal after passing through the second driving circuit, and the direct current signal is used for driving an external power tube.
The working principle of the second driving circuit is as follows: diode D3, electric capacity C2 and diode D4, electric capacity C3 constitute rectifying filter circuit, when the first output of transformer T1 exports high voltage signal, triode Q3 switches on, triode Q4 switches on simultaneously, diode D4 switches off, the voltage that the first output of transformer T1 exports at this moment is through diode D3 and electric capacity C2 rectifying filter back to external power tube's grid, external power tube's grid voltage is forward voltage signal, external power tube switches on, wherein triode Q3 and triode Q4 constitute push-pull circuit for improve the drive capability of electrical signal.
When the first output end of the transformer T1 outputs a low-voltage signal, the triode Q3 is turned off, the triode Q4 is turned on, the diode D3 is turned off, the diode D4 is turned on, the collector electrode of the triode Q4 is a negative voltage signal, and therefore the grid source voltage applied to the external power tube is negative, and the external power tube is turned off. The voltage stabilizing tube Z3 is bridged between the negative power supply and the source electrode of the external power tube, and the negative power supply can be clamped on a more reasonable negative voltage value by selecting the voltage stabilizing tube with a proper voltage stabilizing value, so that the negative voltage is adjusted.
Drawings
The utility model will be described in further detail with reference to the drawings and the detailed description.
Fig. 1 is a circuit diagram of an asymmetric half-bridge driving circuit according to the present utility model.
Detailed Description
The technical solutions of the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1
As shown in fig. 1, the present embodiment provides an asymmetric half-bridge driving circuit, which includes a first driving circuit, a transformer T1 and a second driving circuit, where an input end of the first driving circuit is used for receiving a control signal, an output end of the first driving circuit is connected to an input end of the transformer T1, an output end of the transformer T1 is connected to an input end of the second driving circuit, and an output end of the second driving circuit is used for driving a power tube; the second driving circuit comprises a diode D3, a diode D4, a capacitor C2, a capacitor C3, a triode Q4 and a voltage stabilizing tube Z3, wherein the anode of the diode D3 is connected with the first output end of a transformer T1, the first output end of the transformer T1 is connected with the base electrode of the triode Q3, the base electrode of the triode Q3 is connected with the base electrode of the triode Q4, and the second output end of the transformer T1 is used for being connected with the source electrode of a driven power tube; the second output of transformer T1 is connected through electric capacity C2 to diode D3's negative pole, and triode Q3's collecting electrode is connected to diode D3's negative pole, and triode Q3's projecting pole is used for connecting the grid of driven power tube, and triode Q4's projecting pole is connected to triode Q3's projecting pole, and transformer T1's second output is connected through electric capacity C3 to triode Q4's collecting electrode, diode D4's positive pole is connected to triode Q4's collecting electrode, and transformer T1's first output is connected to diode D4's negative pole.
The asymmetric half-bridge driving circuit in this embodiment is used for driving a power tube, and specifically, the working principle of the asymmetric half-bridge driving circuit is as follows: the input end of the first driving circuit is used for receiving a PWM control signal output by the power management chip or the digital MCU, the first driving circuit is used for improving the driving capability of the signal of the input end, the input signal is added to the input end of the transformer T1 after passing through the first driving circuit, in the embodiment, the transformer T1 is a high-frequency isolation transformer, an asymmetrically complementary alternating signal is generated at the input end of the transformer T1, an asymmetrically complementary alternating signal is also generated at the output end of the transformer T1, and the output voltage amplitude of the transformer T1 is related to the turn ratio of the transformer and the duty ratio of the PWM control signal. The voltage signal at the output end of the transformer T1 is changed into a direct current signal after passing through the second driving circuit, and the direct current signal is used for driving an external power tube.
Specifically, the working principle of the second driving circuit is as follows: diode D3, electric capacity C2 and diode D4, electric capacity C3 constitute rectifying filter circuit, when the first output of transformer T1 exports high voltage signal, triode Q3 switches on, triode Q4 switches on simultaneously, diode D4 switches off, the voltage that the first output of transformer T1 exports at this moment is through diode D3 and electric capacity C2 rectifying filter back to external power tube's grid, external power tube's grid voltage is forward voltage signal, external power tube switches on, wherein triode Q3 and triode Q4 constitute push-pull circuit for improve the drive capability of electrical signal.
When the first output end of the transformer T1 outputs a low-voltage signal, the triode Q3 is turned off, the triode Q4 is turned on, the diode D3 is turned off, the diode D4 is turned on, the collector electrode of the triode Q4 is a negative voltage signal, and therefore the grid source voltage applied to the external power tube is negative, and the external power tube is turned off. The voltage stabilizing tube Z3 is bridged between the negative power supply and the source electrode of the external power tube, and the negative power supply can be clamped on a more reasonable negative voltage value by selecting the voltage stabilizing tube with a proper voltage stabilizing value, so that the negative voltage is adjusted.
Further, the second driving circuit further comprises a resistor R2 and a resistor R3, the first end of the resistor R2 is connected with the cathode of the diode D3, the second end of the resistor R2 is connected with the collector of the triode Q3, the first end of the resistor R3 is connected with the anode of the diode D4, and the second end of the resistor R3 is connected with the collector of the triode Q4.
In this embodiment, the resistor R2 and the resistor R3 play a role in current limiting, and simultaneously, the resistance values of the resistor R2 and the resistor R3 are properly adjusted in the working process of the circuit, so that the amplitude of the positive and negative voltages can be finely adjusted and output.
As shown in fig. 1, the second driving circuit in this embodiment further includes a voltage stabilizing tube Z1 and a voltage stabilizing tube Z2, wherein an anode of the voltage stabilizing tube Z1 is connected to a first output end of the transformer T1, a cathode of the voltage stabilizing tube Z1 is connected to a cathode of the voltage stabilizing tube Z2, and an anode of the voltage stabilizing tube Z2 is connected to a second output end of the transformer T1.
In this embodiment, two voltage-stabilizing tubes are connected in parallel to the output end of the transformer T1 after being connected in series in opposite phase, which protects the transistor Q3 and the transistor Q4 from damage caused by overhigh driving amplitude of the transistor due to parasitic oscillation generated at the output end of the high-frequency transformer.
As shown in fig. 1, in this embodiment, the first driving circuit includes a switching tube Q1 and a switching tube Q2, a control end of the switching tube Q1 is configured to receive a PWM control signal, a control end of the switching tube Q1 is connected to a control end of the switching tube Q2, a first end of the switching tube Q1 is connected to a VCC power supply, a second end of the switching tube Q1 is connected to a first end of the switching tube Q2, a second end of the switching tube Q2 is grounded, a second end of the switching tube Q1 is connected to a first input end of the transformer T1, and a second input end of the transformer T1 is grounded.
In this embodiment, the driving capability of the PWM control signal output by the power management chip or the digital MCU is weak, so the switching tube Q1 and the switching tube Q2 form a totem pole circuit, and have a current amplifying effect on the input signal, and the switching tube Q1 and the switching tube Q2 are controlled by the PWM control signal, and the switching tube Q1 and the switching tube Q2 have different on times but complementary states, which is also called an asymmetric half-bridge circuit.
As shown in fig. 1, the first driving circuit in this embodiment further includes a capacitor C1, a first end of the capacitor C1 is connected to the second end of the switching tube Q1, and a second end of the capacitor C1 is connected to the first input end of the transformer T1.
In this embodiment, the transformer T1 adopts ferrite material as the magnetic core, and the ferrite material has a high magnetic permeability, but a low magnetic saturation density, and weak capability of bearing dc bias magnetic energy, and generally, a blocking capacitor C1 is connected in series to the input end of the transformer T1 (the primary side of the transformer T1), so as to prevent the dc component from flowing through the transformer, and avoid saturation of the transformer due to dc magnetization. The PWM signal output by the totem pole circuit is a unipolar signal, and contains a direct current component, and after passing through the blocking capacitor C1, an asymmetric complementary alternating signal is generated on the primary side of the transformer T1.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (4)
1. The asymmetric half-bridge driving circuit is characterized by comprising a first driving circuit, a transformer T1 and a second driving circuit, wherein the input end of the first driving circuit is used for receiving a control signal, the output end of the first driving circuit is connected with the input end of the transformer T1, the output end of the transformer T1 is connected with the input end of the second driving circuit, and the output end of the second driving circuit is used for driving a power tube;
The second driving circuit comprises a diode D3, a diode D4, a capacitor C2, a capacitor C3, a triode Q4 and a voltage stabilizing tube Z3, wherein the anode of the diode D3 is connected with the first output end of the transformer T1, the first output end of the transformer T1 is connected with the base electrode of the triode Q3, the base electrode of the triode Q3 is connected with the base electrode of the triode Q4, and the second output end of the transformer T1 is used for being connected with the source electrode of a driven power tube;
The negative pole of diode D3 passes through electric capacity C2 connects the second output of transformer T1, diode D3's negative pole is connected triode Q3's collecting electrode, triode Q3's projecting pole is used for connecting the grid of driven power tube, triode Q3's projecting pole is connected triode Q4's projecting pole, triode Q4's collecting electrode passes through electric capacity C3 connects transformer T1's second output, triode Q4's collecting electrode is connected diode D4's positive pole, diode D4's negative pole is connected transformer T1's first output.
2. The asymmetric half-bridge driving circuit as claimed in claim 1, wherein the second driving circuit further comprises a voltage regulator tube Z1 and a voltage regulator tube Z2, wherein an anode of the voltage regulator tube Z1 is connected to the first output terminal of the transformer T1, a cathode of the voltage regulator tube Z1 is connected to the cathode of the voltage regulator tube Z2, and an anode of the voltage regulator tube Z2 is connected to the second output terminal of the transformer T1.
3. The asymmetric half-bridge driving circuit according to claim 1, wherein the first driving circuit comprises a switching tube Q1 and a switching tube Q2, a control end of the switching tube Q1 is used for receiving a PWM control signal, the control end of the switching tube Q1 is connected with the control end of the switching tube Q2, a first end of the switching tube Q1 is connected with a VCC power supply, a second end of the switching tube Q1 is connected with a first end of the switching tube Q2, a second end of the switching tube Q2 is grounded, a second end of the switching tube Q1 is connected with a first input end of the transformer T1, and a second input end of the transformer T1 is grounded.
4. An asymmetric half-bridge driver circuit as claimed in claim 3, wherein the first driver circuit further comprises a capacitor C1, a first terminal of the capacitor C1 is connected to the second terminal of the switching tube Q1, and a second terminal of the capacitor C1 is connected to the first input terminal of the transformer T1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322811401.2U CN221177565U (en) | 2023-10-19 | 2023-10-19 | Asymmetric half-bridge driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322811401.2U CN221177565U (en) | 2023-10-19 | 2023-10-19 | Asymmetric half-bridge driving circuit |
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| CN221177565U true CN221177565U (en) | 2024-06-18 |
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| CN202322811401.2U Active CN221177565U (en) | 2023-10-19 | 2023-10-19 | Asymmetric half-bridge driving circuit |
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| CN (1) | CN221177565U (en) |
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- 2023-10-19 CN CN202322811401.2U patent/CN221177565U/en active Active
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