IGBT (Insulated Gate Bipolar Translator) driving circuit and chip
By using totem pole circuits and transformers to amplify the signal in the IGBT driving circuit, the problems of poor isolation and high cost in the IGBT driving circuit in the prior art are solved, and more efficient isolation and lower costs are achieved.
Patent Information
- Application Number
- CN202421840400.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-07-31
AI Technical Summary
The existing IGBT driver circuits have problems such as large external environment interference, poor isolation effect and high cost.
The totem pole circuit and transformer amplifies the driving signal, and the combination of the totem pole circuit and transformer circuit can achieve signal amplification and isolation, reducing circuit complexity and cost.
It effectively reduces the cost of IGBT driving circuit, improves isolation effect, and reduces interference to the external environment.
Smart Images
Figure CN222884538U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electronic circuits, and in particular to an IGBT drive circuit and a chip. Background Art
[0002] The isolation drive of the switch tube is of great significance to the performance of power products, the anti-interference of the control system, and even the implementation of product design solutions such as the application of some circuit topologies. There are several ways of isolation drive in the existing technology: dedicated isolation drive integrated IC, optocoupler isolation drive, etc., but these isolation drive methods have some defects and shortcomings, such as: 1. The peripheral circuit of the driver integrated IC is complex and the cost is high, which is not conducive to reducing product costs; 2. The optocoupler isolation drive is limited by the optocoupler conversion rate and is not suitable for high-frequency drive signal occasions. For example, when IGBT is used, a drive circuit is required. Currently, the above solution is mostly used to drive the circuit IGBT, but this method is easily interfered by the external environment, cannot isolate the IGBT well, and has high cost.
[0003] Therefore, there is a need for an IGBT driving circuit with simple circuit, low cost and good isolation effect. Utility Model Content
[0004] In view of the deficiencies in the prior art, the utility model provides an IGBT drive circuit and chip, which can effectively reduce circuit costs and improve isolation effects by amplifying the drive signal through a totem pole circuit and a transformer and restoring the drive signal to a signal of a required amplitude.
[0005] The utility model discloses an IGBT drive circuit through an embodiment, including: a totem pole circuit, a transformer circuit, a first protection circuit and an output drive resistor. Among them, the control signal input end of the totem pole circuit serves as the control end of the IGBT drive circuit, the output end of the totem pole circuit is connected to the first end of the primary coil of the transformer circuit, the ground end of the totem pole circuit is connected to the second end of the primary coil of the transformer circuit, and the ground end of the totem pole circuit is also connected to the first ground end; the first end of the secondary coil of the transformer circuit is connected to the first end of the output drive resistor, and the second end of the output drive resistor serves as the output end of the IGBT drive circuit; the first end of the secondary coil of the transformer circuit is also connected to the first end of the first protection circuit, the second end of the secondary coil of the transformer circuit is connected to the second end of the first protection circuit, and the second end of the secondary coil of the transformer circuit is also connected to the second ground end.
[0006] It is worth noting that the first ground terminal and the second ground terminal are two different ground terminals that are not affected by each other. Such a setting can achieve a better isolation and amplification effect.
[0007] Furthermore, the driving circuit also includes a pulse signal output circuit, the output end of the pulse signal output circuit is connected to the control signal input end of the totem pole circuit, the ground end and the negative input end of the pulse signal output circuit are both connected to the first ground end; the positive input end of the pulse signal output circuit serves as the control end of the IGBT driving circuit.
[0008] Furthermore, the driving circuit also includes an input driving resistor, which is connected between the output end of the pulse signal output circuit and the control signal input end of the totem pole circuit, and can play a role in input circuit protection.
[0009] Furthermore, a first capacitor is connected to the power supply port of the pulse signal output circuit. The first capacitor is connected to the first ground terminal and can protect the power supply of the pulse signal output circuit.
[0010] Furthermore, the totem pole circuit includes a first NPN-type transistor and a second PNP-type transistor; after the base of the first transistor is connected to the base of the second transistor, it serves as the control signal input terminal of the totem pole circuit; after the emitter of the first transistor is connected to the emitter of the second transistor, it serves as the output terminal of the totem pole circuit, the output terminal of the totem pole circuit is connected to the first end of the primary coil of the transformer circuit, and the second end of the primary coil of the transformer circuit is connected to the first ground terminal; the collector of the first transistor is connected to the power supply as the input terminal of the totem pole circuit; the collector of the second transistor is connected to the first ground terminal.
[0011] Furthermore, the first protection circuit includes a bidirectional voltage regulator diode. The first end of the secondary coil of the transformer circuit is connected to the first end of the bidirectional voltage regulator diode, the second end of the secondary coil of the transformer circuit is connected to the second end of the bidirectional voltage regulator diode, and the second end of the bidirectional voltage regulator diode is connected to the second ground end. The bidirectional voltage regulator diode is used to protect the driving signal of the IGBT, and when the voltage reaches a certain value, the bidirectional voltage regulator diode is turned on to play a freewheeling role.
[0012] Furthermore, the driving circuit further includes a second protection circuit, which includes a second capacitor, a first end of the second capacitor is connected to the output end of the totem pole circuit, and a second end of the second capacitor is connected to the first end of the primary coil of the transformer circuit. Connecting the capacitor here can block direct current and pass alternating current, so as to quickly transmit signals.
[0013] Furthermore, the driving circuit further includes a third protection circuit, which includes a third capacitor, a first end of the third capacitor is connected to the first end of the secondary coil of the transformer circuit, and a second end of the third capacitor is connected to the first end of the first protection circuit and the first end of the output driving resistor, respectively. Connecting the capacitor here can block direct current and pass alternating current, so as to quickly transmit signals.
[0014] In order to achieve the above object, the utility model also provides an IGBT driver chip, which includes the above IGBT driver circuit and is used to drive the IGBT module.
[0015] The technical principle of the utility model is: when the pulse signal output circuit outputs a high-level signal, the first triode is turned on and the second triode is turned off, and at this time, the current flowing through the second capacitor and the transformer current is at a high level;
[0016] When the pulse signal output circuit outputs a low level signal, the first transistor is turned off and the second transistor is turned on. At this time, the signal passing through the second capacitor and the transformer current is at a low level;
[0017] The driving pulse signal is amplified by the transformer circuit and then transmitted to the third capacitor and the bidirectional voltage regulator diode. After being protected by the third capacitor and the voltage regulator diode, the isolation signal is transmitted without amplitude reduction.
[0018] Compared with the prior art, the utility model has the following beneficial effects: the circuit is simpler, the components used are less expensive, and different grounds are used to isolate the ground electrode of the driver chip, resulting in a better isolation effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solution of the utility model and facilitate further understanding of the technical effects, technical features and purposes of the utility model, the utility model is described in detail below in conjunction with the accompanying drawings. The accompanying drawings constitute an essential part of the specification and are used together with the embodiments of the utility model to illustrate the technical solution of the utility model, but do not constitute a limitation to the utility model.
[0020] Figure 1 A schematic block diagram of an IGBT drive circuit described in the present utility model;
[0021] Figure 2 The schematic diagram of the IGBT drive circuit described in the utility model;
[0022] Figure 3 This is a schematic diagram of the IGBT driver chip described in the present utility model. DETAILED DESCRIPTION
[0023] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. Of course, the specific embodiments described below are only for explaining the technical solution of the present invention, rather than for limiting the present invention. In addition, the parts described in the embodiments or drawings are only examples of the relevant parts of the present invention, rather than the entirety of the present invention. At the same time, based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field should naturally belong to the protection scope of the present invention.
[0024] like Figure 1 As shown, the utility model proposes an IGBT drive circuit through the following embodiments, including: a totem pole circuit, a transformer circuit U2, a first protection circuit D1 and an output drive resistor R2. Among them, the control signal input end of the totem pole circuit serves as the control end of the IGBT drive circuit, the output end of the totem pole circuit is connected to the first end of the primary coil of the transformer circuit U2, the ground end of the totem pole circuit is connected to the second end of the primary coil of the transformer circuit U2, and the ground end of the totem pole circuit is also connected to the first ground end GND1; the first end of the secondary coil of the transformer circuit U2 is connected to the first end of the output drive resistor R2, and the second end of the output drive resistor R2 serves as the output end of the IGBT drive circuit; the first end of the secondary coil of the transformer circuit U2 is also connected to the first end of the first protection circuit D1, the second end of the secondary coil of the transformer circuit U2 is connected to the second end of the first protection circuit D1, and the second end of the secondary coil of the transformer circuit U2 is also connected to the second ground end GND2.
[0025] It is worth noting that the first ground terminal GND1 and the second ground terminal GND2 are two different ground terminals that are not affected by each other. Such a setting can achieve a better isolation and amplification effect.
[0026] like Figure 2 As shown, in this embodiment, the drive circuit also includes a pulse signal output circuit U1, the output end of the pulse signal output circuit U1 is connected to the control signal input end of the totem pole circuit, the ground end and the negative input end of the pulse signal output circuit U1 are both connected to the first ground end GND1; the positive input end of the pulse signal output circuit U1 serves as the control end of the IGBT drive circuit.
[0027] like Figure 2 As shown, in this embodiment, the driving circuit further includes an input driving resistor R1, which is connected between the output end of the pulse signal output circuit U1 and the control signal input end of the totem pole circuit, and can play a role in input circuit protection.
[0028] like Figure 2 As shown, in this embodiment, a first capacitor C1 is also connected to the power supply port of the pulse signal output circuit U1. The first capacitor C1 is connected to the first ground terminal GND1, which can protect the power supply VDD of the pulse signal output circuit U1.
[0029] like Figure 2As shown, in this embodiment, the totem pole circuit includes a first NPN transistor Q1 and a second PNP transistor Q2; after the base of the first transistor Q1 is connected to the base of the second transistor Q2, it serves as the control signal input end of the totem pole circuit; after the emitter of the first transistor Q1 is connected to the emitter of the second transistor Q2, it serves as the output end of the totem pole circuit, the output end of the totem pole circuit is connected to the first end of the primary coil of the transformer circuit, and the second end of the primary coil of the transformer circuit is connected to the first ground end; the collector of the first transistor Q1 is connected to the power supply VCC, serving as the input end of the totem pole circuit; the collector of the second transistor Q2 is connected to the first ground end GND1.
[0030] like Figure 2 As shown, in this embodiment, the first protection circuit includes a bidirectional voltage regulator diode D1. The first end of the secondary coil of the transformer circuit U2 is connected to the first end of the bidirectional voltage regulator diode D2, the second end of the secondary coil of the transformer circuit U2 is connected to the second end of the bidirectional voltage regulator diode D2, and the second end of the bidirectional voltage regulator diode D2 is connected to the second ground end. The bidirectional voltage regulator diode D2 is used to protect the driving signal of the IGBT, and when the voltage reaches a certain value, the bidirectional voltage regulator diode D2 is turned on to act as a freewheeling function.
[0031] like Figure 2 As shown, in this embodiment, the driving circuit further includes a second protection circuit C2, the second protection circuit C2 includes a second capacitor, a first end of the second capacitor is connected to the output end of the totem pole circuit, and a second end of the second capacitor is connected to the first end of the primary coil of the transformer circuit U2. Connecting the capacitor C2 here can block direct current and pass alternating current, so as to quickly transmit signals.
[0032] like Figure 2 As shown, in this embodiment, the drive circuit further includes a third protection circuit C3, the third protection circuit C3 includes a third capacitor, the first end of the third capacitor is connected to the first end of the secondary coil of the transformer circuit U2, and the second end of the third capacitor is respectively connected to the first end of the first protection circuit D1 and the first end of the output drive resistor R2. Connecting the capacitor C3 here can block direct current and pass alternating current, so as to quickly transmit signals.
[0033] like Figure 3 As shown, in order to achieve the above purpose, the utility model also provides an IGBT driver chip, which includes the above-mentioned IGBT driver circuit and is used to drive the IGBT module.
[0034] It should be noted that the above embodiments are only for more clearly illustrating the technical solution of the present invention. Those skilled in the art will understand that the implementation methods of the present invention are not limited to the above contents, and obvious changes, replacements or substitutions based on the above contents do not exceed the scope covered by the technical solution of the present invention; other implementation methods will naturally fall within the scope of the present invention without departing from the concept of the present invention.
Claims
1. An IGBT driving circuit, characterized in that: include: A totem pole circuit, a transformer circuit, a first protection circuit and an output drive resistor; The control signal input end of the totem pole circuit serves as the control end of the IGBT driving circuit, the output end of the totem pole circuit is connected to the first end of the primary coil of the transformer circuit, the ground end of the totem pole circuit is connected to the second end of the primary coil of the transformer circuit, and the ground end of the totem pole circuit is also connected to the first ground end; A first end of the secondary coil of the transformer circuit is connected to a first end of the output drive resistor, and a second end of the output drive resistor serves as an output end of the IGBT drive circuit; The first end of the secondary coil of the transformer circuit is also connected to the first end of the first protection circuit, the second end of the secondary coil of the transformer circuit is connected to the second end of the first protection circuit, and the second end of the secondary coil of the transformer circuit is also connected to the second ground end.
2. The IGBT driving circuit according to claim 1, wherein: It also includes a pulse signal output circuit, the output end of the pulse signal output circuit is connected to the control signal input end of the totem pole circuit, the ground end and the negative input end of the pulse signal output circuit are both connected to the first ground end; the positive input end of the pulse signal output circuit serves as the control end of the IGBT drive circuit.
3. The IGBT driving circuit according to claim 2, wherein: The circuit also includes an input drive resistor connected between the output end of the pulse signal output circuit and the control signal input end of the totem pole circuit.
4. The IGBT driving circuit according to claim 2, wherein: The power supply port of the pulse signal output circuit is also connected to a first capacitor, and the first capacitor is connected to the first ground terminal.
5. The IGBT driving circuit according to claim 1, wherein: The totem pole circuit includes a first NPN transistor and a second PNP transistor.
6. The IGBT driving circuit according to claim 5, characterized in that: The base of the first transistor is connected to the base of the second transistor and serves as the control signal input terminal of the totem pole circuit; the emitter of the first transistor is connected to the emitter of the second transistor and serves as the output terminal of the totem pole circuit, the output terminal of the totem pole circuit is connected to the first end of the primary coil of the transformer circuit, and the second end of the primary coil of the transformer circuit is connected to the first ground terminal; the collector of the first transistor is connected to the power supply and serves as the input terminal of the totem pole circuit; the collector of the second transistor is connected to the first ground terminal.
7. The IGBT driving circuit according to claim 1, wherein: The first protection circuit includes a bidirectional voltage regulator diode; The first end of the secondary coil of the transformer circuit is connected to the first end of the bidirectional voltage regulator diode, the second end of the secondary coil of the transformer circuit is connected to the second end of the bidirectional voltage regulator diode, and the second end of the bidirectional voltage regulator diode is connected to the second ground end.
8. The IGBT driving circuit according to claim 1, wherein: It also includes a second protection circuit, which includes a second capacitor, a first end of the second capacitor is connected to the output end of the totem pole circuit, and a second end of the second capacitor is connected to the first end of the primary coil of the transformer circuit.
9. The IGBT driving circuit according to any one of claims 1 to 8, characterized in that: It also includes a third protection circuit, which includes a third capacitor, a first end of the third capacitor is connected to the first end of the secondary coil of the transformer circuit, and a second end of the third capacitor is respectively connected to the first end of the first protection circuit and the first end of the output drive resistor.
10. An IGBT driver chip, characterized in that: It includes the IGBT driving circuit described in claim 9.