CN218633900U

CN218633900U - Parallel power device driving circuit, device and system

Info

Publication number: CN218633900U
Application number: CN202222804116.3U
Authority: CN
Inventors: 马靖然; 张勉; 吴岩松
Original assignee: Suzhou Huichuan Control Technology Co Ltd
Current assignee: Suzhou Huichuan Control Technology Co Ltd
Priority date: 2022-10-24
Filing date: 2022-10-24
Publication date: 2023-03-14
Anticipated expiration: 2032-10-24

Abstract

The utility model discloses a parallelly connected power device drive circuit, device and system, parallelly connected power device drive circuit includes: the decoupling circuit comprises a power supply circuit, a decoupling circuit and a driving circuit; the power supply circuit is connected to the corresponding power tube to be driven through each decoupling circuit and each driving circuit respectively, and the resistance value of a decoupling element directly connected with the driving circuit in the decoupling circuit is lower than a preset resistance value. The utility model discloses in through in the decoupling zero circuit with the decoupling zero component's that drive circuit directly links resistance value is injectd to when power device's switching frequency improves gradually, reduce the consumption of decoupling zero component, avoid producing a large amount of heats.

Description

Parallel power device driving circuit, device and system

Technical Field

The utility model relates to a drive technical field especially relates to a parallelly connected power device drive circuit, device and system.

Background

In a conventional parallel power device driving circuit, in order to decouple the circuit of each power device, it is a common practice to use a resistor with a relatively large resistance value as a decoupling element to separate the circuits of the power devices.

The current application trend is that the switching frequency of the power device is gradually increased, so that the supply current of the driving circuit is also increased, and at the moment, the power consumption of a resistor used for separating the circuit of the power device is increased, so that the driving of the power device is influenced by overheating of the driving circuit.

The above is only for the purpose of assisting understanding of the technical solutions of the present invention, and does not represent an admission that the above is the prior art.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide a parallel power device driving circuit, apparatus and system, which aims to solve the technical problem of serious heat generation caused by the increase of power consumption of decoupling elements in the prior art.

In order to achieve the above object, the utility model provides a parallelly connected power device drive circuit, parallelly connected power device drive circuit includes: the decoupling circuit comprises a power supply circuit, a decoupling circuit and a driving circuit; the power supply circuit is connected to the corresponding power tube to be driven through each decoupling circuit and each driving circuit respectively; the resistance value of a decoupling element directly connected with the driving circuit in the decoupling circuit is lower than a preset resistance value;

the decoupling circuit is used for inputting the power supply voltage output by the power supply circuit to the driving circuit through the decoupling element;

and the driving circuit is used for conducting the connection between the power supply circuit and the control end of the power tube to be driven when receiving a driving signal.

Optionally, the decoupling circuit comprises a first inductance and a second inductance;

the resistance values of the first inductor and the second inductor are lower than the preset resistance value;

a first end of the first end inductor is connected with a first end of the power supply circuit, and a second end of the first inductor is connected with a first input end of the driving circuit; the first end of the second inductor is connected with the second end of the power supply circuit, and the second end of the second inductor is connected with the second input end of the driving circuit.

Optionally, the decoupling circuit further comprises: a first resistor;

the first end of the first resistor is connected with the third end of the power circuit, and the second end of the first resistor is connected with the output end of the power tube to be driven.

Optionally, the driving circuit comprises: the second resistor, the first switch tube and the second switch tube;

the control end of the first switch tube is connected with the control end of the second switch tube and the starting signal output end respectively, the input end of the first switch tube is connected with the decoupling circuit, the output end of the first switch tube is connected with the first end of the second resistor and the input end of the second switch tube, the output end of the second switch tube is connected with the decoupling circuit, and the second end of the second resistor is connected with the control end of the power tube to be driven.

Optionally, the driving circuit further comprises: a first capacitor and a second capacitor;

the first end of the first capacitor is connected with the output end of the decoupling circuit and the input end of the first switch tube, the second end of the first capacitor is connected with the first end of the second capacitor, and the second end of the second capacitor is respectively connected with the decoupling circuit and the output end of the second switch tube.

Optionally, the power supply circuit comprises: the power supply, the third resistor and the fourth resistor;

the positive pole of the power supply is connected with the first end of the third resistor and the first end of the first inductor, the negative pole of the power supply is connected with the second end of the fourth resistor and the first end of the second inductor, and the second end of the third resistor is connected with the first end of the fourth resistor.

Optionally, the parallel power device driving circuit further includes: a voltage stabilizing circuit;

the voltage stabilizing circuit is respectively connected with the power circuit and the decoupling circuit;

and the voltage stabilizing circuit is used for stabilizing the power supply voltage output by the power supply circuit and outputting the stabilized power supply voltage to the decoupling circuit.

Optionally, the voltage stabilizing circuit includes: a first diode and a second diode;

the anode of the first diode is connected with the anode of the power supply, the first end of the third resistor and the first end of the first inductor, the cathode of the first diode is connected with the cathode of the second diode, and the anode of the second diode is connected with the first end of the first resistor, the second end of the third resistor and the first end of the fourth resistor respectively.

In order to achieve the above object, the utility model discloses still provide a parking stall discernment management system, parking stall discernment management system includes parallelly connected power device drive circuit.

The utility model provides a parallelly connected power device drive circuit, device and system, parallelly connected power device drive circuit includes: the decoupling circuit comprises a power supply circuit, a decoupling circuit and a driving circuit; the power circuit is connected to the corresponding power tube to be driven through each decoupling circuit and each driving circuit respectively; the resistance value of a decoupling element directly connected with the driving circuit in the decoupling circuit is lower than a preset resistance value; the decoupling circuit is used for inputting the power supply voltage output by the power supply circuit to the driving circuit through the decoupling element; and the driving circuit is used for conducting the connection between the power supply circuit and the control end of the power tube to be driven when receiving a driving signal. The utility model discloses in through in the decoupling zero circuit with the decoupling zero component's that drive circuit directly links resistance value is injectd to when power device's switching frequency improves gradually, reduce the consumption of decoupling zero component, avoid producing a large amount of heats.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a first embodiment of a parallel power device driving circuit according to the present invention;

fig. 2 is a schematic structural diagram of a second embodiment of a parallel power device driving circuit according to the present invention;

fig. 3 is a schematic circuit diagram of a second embodiment of a parallel power device driving circuit according to the present invention;

fig. 4 is a schematic diagram of emitter circulation in a second embodiment of a parallel power device driving circuit according to the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				10	Power supply circuit	R1～R4	First to fourth resistors
20	Decoupling circuit	V1	Power supply
				30	Driving circuit	C1～C2	First to second capacitors
40	Voltage stabilizing circuit	U1～U2	First to second switching tubes
				D1～D2	First to second diodes	L1～L2	First to second inductors
Q1	Power tube to be driven

The realization, the functional characteristics and the advantages of the utility model are further explained by combining the embodiment and referring to the attached drawings.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, back, 8230; \8230;) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, the combination of the technical solutions should be considered to be absent, and is not within the protection scope of the present invention.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a first embodiment of a parallel power device driving circuit according to the present invention. Based on fig. 1, the present invention provides a first embodiment of a parallel power device driving circuit.

In this embodiment, the parallel power device driving circuit includes: a power supply circuit 10, a decoupling circuit 20 and a drive circuit 30; the power circuit 10 is connected to the corresponding power tubes to be driven through the decoupling circuits 20 and the driving circuits 30, that is, the power circuit 10 is connected to the decoupling circuits 20, the decoupling circuits 20 are connected to the driving circuits 30, the driving circuits 30 are connected to the control ends of the power tubes to be driven, and the resistance values of decoupling elements directly connected to the driving circuits 30 in the decoupling circuits 20 are lower than a preset resistance value.

It should be understood that, in the driving process of the parallel power device, because mutual influence exists among a plurality of parallel loops, a decoupling device needs to be arranged in the loop generally comprising the power device in the driving process, so as to avoid influencing the driving of the power device.

It should be noted that the power supply circuit 10 is used for outputting a power supply voltage to provide a driving voltage for the power device 30 to be driven. The decoupling circuit 20 is a circuit for decoupling between a plurality of branches in the drive power device, and a number of decoupling devices are included in the decoupling circuit 20. The drive circuit 30 is a circuit for driving the power transistor to be driven. The driving circuit 30 may generate a corresponding driving voltage according to the start signal to drive the power device.

In a specific implementation, the power circuit 10 may output a power voltage to the decoupling circuit 20, and the decoupling circuit inputs the power voltage output by the power circuit to the driving circuit 30 through the decoupling element when receiving the power voltage; when receiving a driving signal, the driving circuit 30 may turn on the connection between the power circuit 10 and the control end of the power tube to be driven, so as to input the power voltage to the power device to be driven, and drive the power device.

The start signal is a signal for controlling the driving module 30 to input the power voltage to the power device to be driven. The start signal may be a PWM signal, or may be a high level signal. The preset resistance value is a resistance value preset for determining a resistance value standard of the decoupling element. The preset resistance value can be set according to parameters such as specific voltage, current and power of the decoupling element of the circuit. Under the condition that the normal operation of the driving circuit is not influenced, the smaller the preset resistance value is, the smaller the generated heat is.

In the present embodiment, there is provided a parallel power device driving circuit, including: the decoupling circuit comprises a power supply circuit, a decoupling circuit and a driving circuit; the power supply circuit is connected to the corresponding power tube to be driven through each decoupling circuit and each driving circuit respectively, and the resistance value of a decoupling element in the decoupling circuit, which is directly connected with the driving circuit, is lower than a preset resistance value; the decoupling circuit is used for inputting the power supply voltage output by the power supply circuit to the driving circuit through the decoupling element; and the driving circuit is used for conducting the connection between the power supply circuit and the control end of the power tube to be driven when receiving a driving signal. In the embodiment, the resistance value of the decoupling element directly connected with the driving circuit in the decoupling circuit is limited, so that when the switching frequency of the power device is gradually increased, the power consumption of the decoupling element is reduced, and a large amount of heat is prevented from being generated.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a second embodiment of the parallel power device driving circuit according to the present invention. The first embodiment based on the above parallel power device driving circuit provides the second embodiment of the parallel power device driving circuit of the present invention.

In the present embodiment, the decoupling circuit 20 includes a first inductor L1 and a second inductor L2;

the resistance values of the first inductor L1 and the second inductor L2 are lower than the preset resistance value;

a first end of the first end inductor L1 is connected to a first end of the power circuit 10, and a second end of the first inductor L1 is connected to a first input end of the driving circuit 30; a first end of the second inductor L2 is connected to a second end of the power circuit 10, and a second end of the second inductor L2 is connected to a second input end of the driving circuit 30.

It should be understood that the electronic components are mainly divided into an inductive element, a resistive element and a capacitive element, wherein the inductive element is generally lower in resistance than the resistive element, and therefore in this embodiment, an inductance may be used as the decoupling element instead of a resistance.

Referring to fig. 3, in the present embodiment, the power circuit 10 includes three terminals, wherein a first terminal outputs a positive voltage, a second terminal outputs a negative voltage, and a third terminal outputs a zero voltage. The positive voltage and the negative voltage are both voltages input to the drive circuit 30 for driving the power device. The driving circuit 30 includes two input terminals, a first input terminal is used for inputting a positive voltage, a second input terminal is used for inputting a negative voltage, when a positive voltage is input to the power device to be driven through the driving circuit 30, the power device can be driven to conduct; when a negative voltage is input to the power device to be driven through the driving circuit 30, the power device can be driven to be turned off.

The first inductor L1 and the second inductor L2 are inductors for decoupling the positive voltage input branch and the negative voltage input branch. The impedance of the first inductor L1 and the second inductor L2 is much smaller than the resistance impedance of the same structure. In addition, in this embodiment, other components may be further disposed at the first inductor L1 and the second inductor L2 as decoupling elements, but the resistance value of the decoupling element should be smaller than the preset resistance value.

Furthermore, in this embodiment, the decoupling circuit 20 further includes: a first resistor R1;

a first end of the first resistor R1 is connected to a third end of the power circuit 10, and a second end of the first resistor R1 is connected to an output end of the to-be-driven power transistor Q1.

Referring to fig. 4, it is understood that the output terminals of the parallel power devices are generally connected together, and the voltage or current output from the output terminal of the previous power device easily forms a circulating current with the driving circuit 30 of the subsequent power device. In fig. 4, the current at the output end of the power tube Q1 to be driven flows into the first resistor R1 in the next power device to be driven through the first resistor R1 to form a circular current. Due to asymmetry or asynchronism of one or more factors, a potential difference can be generated at an output end at the moment when the parallel power device is switched on or switched off. The emitters of each power device are connected together, which results in emitter circulating currents. This circulating current has a great influence on the driving of the latter power device.

In this embodiment, the first resistor R1 is connected to the output end of the to-be-driven power transistor Q1, so that energy generated by the current output by the output end of the to-be-driven power transistor Q1 can be consumed, and emitter ring current and oscillation are avoided. In addition, the first resistor R1 is connected to the output end of the to-be-driven power transistor Q1, and the driving process of the to-be-driven power transistor Q1 is not affected.

In the present embodiment, the driving circuit 30 includes: the circuit comprises a second resistor R2, a first switch tube U1 and a second switch tube U2;

the control end of the first switch tube U1 is connected with the control end of the second switch tube U2 and the starting signal output end respectively, the input end of the first switch tube U1 is connected with the decoupling circuit 20, the output end of the first switch tube U1 is connected with the first end of the second resistor R2 and the input end of the second switch tube U2, the output end of the second switch tube U2 is connected with the decoupling circuit 20, and the second end of the second resistor U2 is connected with the control end of the power tube Q1 to be driven.

It should be understood that the first switching tube U1 and the second switching tube U2 form a push-pull circuit, and the control ends of the first switching tube U1 and the second switching tube U2 are connected together and controlled by the same driving signal. The first switch tube U1 is a switch tube such as an NPN-type triode, an NMOS tube, etc., and similarly, the second switch tube U2 is a switch tube such as a PNP-type triode, a PMOS tube, etc.

When the starting signal is at a high level, the first switch tube U1 is turned on, the second switch tube U2 is turned off, and a positive voltage output by the power circuit 10 may be input to the to-be-driven power tube Q1 through the first inductor L1 and the first switch tube U1 to drive the to-be-driven power tube Q1 to be turned on; similarly, when the start signal is at a low level, the first switch tube U1 is turned off, the second switch tube U2 is turned on, and the negative voltage output by the power supply circuit 10 may be input to the power tube Q1 to be driven through the second inductor L2 and the second switch tube U2 to drive the power tube Q1 to be driven to be turned off.

In this embodiment, the driving circuit 30 further includes: a first capacitor C1 and a second capacitor C2;

the first end of the first capacitor C1 is connected to the output end of the decoupling circuit 20 and the input end of the first switch tube U1, the second end of the first capacitor C1 is connected to the first end of the second capacitor C2, and the second end of the second capacitor C2 is connected to the decoupling circuit 20 and the output end of the second switch tube U2, respectively.

It should be understood that the first capacitor C1 and the second capacitor C2 are both voltage stabilization capacitors. The first capacitor C1 can maintain the voltage input to the power transistor Q1 to be driven through the first inductor L1 and the first switching tube U1 at a stable positive voltage. Similarly, the second capacitor C2 can maintain the voltage input to the power transistor Q1 to be driven at a stable negative voltage.

It can be understood that the first capacitor C1 and the second capacitor C2 have charging and discharging characteristics, and when the first switch tube U1 is turned on, the first capacitor C1 can discharge, so that a positive voltage is formed at the input end of the first switch tube U1, and the power supply V1 can charge the first capacitor C1 through the first inductor L1. Similarly, the second capacitor C1 can discharge when the second switch tube U2 is turned on, a negative voltage is formed at the output end of the second switch tube U2, and the power supply V1 can also charge the second charging capacitor C2 through the second inductor L2.

In the present embodiment, the power supply circuit 10 includes: the power supply V1, the third resistor R3 and the fourth resistor R4;

the positive pole of the power supply V1 is connected to the first end of the third resistor R3 and the first end of the first inductor L1, the negative pole of the power supply V1 is connected to the second end of the fourth resistor R4 and the first end of the second inductor L2, and the second end of the third resistor R3 is connected to the first end of the fourth resistor R4.

It should be understood that the power supply V1 is a three-level power supply, and a positive voltage can be output through the first end of the third resistor R3, a zero voltage is output through the middle of the third resistor R3 and the fourth resistor R4, and a negative voltage is output through the second end of the fourth resistor R4.

In this embodiment, the parallel power device driving circuit further includes: a voltage stabilizing circuit 40;

the voltage stabilizing circuit 40 is connected to the power circuit 10 and the decoupling circuit 20, respectively.

It should be understood that the power voltage output by the power supply V1 may not be stable due to interference or the like, thereby affecting the driving of the to-be-driven power transistor Q1. In the present embodiment, the voltage stabilizing circuit 40 may be provided to stabilize the power supply voltage, so as to prevent the driving of the power transistor Q1 to be driven from being affected due to the voltage value fluctuation of the power supply voltage.

In this embodiment, the voltage stabilizing circuit 40 may stabilize the power voltage output by the power circuit 10, and output the stabilized power voltage to the decoupling circuit 20.

In this embodiment, the voltage stabilizing circuit 40 includes: a first diode D1 and a second diode D2;

an anode of the first diode D1 is connected to an anode of the power supply V1, a first end of the third resistor R3, and a first end of the first inductor L1, a cathode of the first diode D1 is connected to a cathode of the second diode D2, and an anode of the second diode D2 is connected to the first end of the first resistor R1, the second end of the third resistor R3, and the first end of the fourth resistor R4, respectively.

It should be understood that, in the present embodiment, the second diode D2 may be a zener diode for stabilizing voltage. The constant voltage drop of the second diode D1 can be utilized to stabilize the power supply voltage output by the power supply V1, so that the power supply voltage output by the first inductor L1 and the first switch tube U1 is the power supply voltage with a stable voltage value.

In the embodiment, the problem of serious heat generation of the decoupling resistor is solved by arranging the first inductor and the second inductor, and meanwhile, the circulation of the parallel power device can be restrained by utilizing the arranged first inductor, so that the influence of the circulation on the driving of the power tube to be driven is avoided.

In addition, for realizing the above object, the utility model also provides a parallelly connected power device drive arrangement, parallelly connected power device drive arrangement includes the parallelly connected power device drive circuit of the aforesaid, and this parallelly connected power device drive arrangement's concrete structure includes all structures of the parallelly connected power device drive circuit of the aforesaid, specifically can refer to parallelly connected power device drive circuit structure, and the specific structure of power tester is not repeated here.

In addition for realizing above-mentioned purpose, the utility model also provides a parallelly connected power device actuating system, parallelly connected power device actuating system includes the parallelly connected power device drive arrangement of the aforesaid, and this parallelly connected power device actuating system's concrete structure includes all structures of the parallelly connected power device driven of the aforesaid, specifically can refer to parallelly connected power device drive circuit structure, and the specific structure of here to parallelly connected power device driven is not repeated.

The above is only the preferred embodiment of the present invention, and the patent scope of the present invention is not limited thereby, and all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings of the present invention, or directly or indirectly applied to other related technical fields, are included in the same way in the patent protection scope of the present invention.

Claims

1. A parallel power device driving circuit, comprising: the device comprises a power supply circuit, a decoupling circuit and a driving circuit;

the power supply circuit is connected to the corresponding power tube to be driven through each decoupling circuit and each driving circuit respectively;

the resistance value of a decoupling element directly connected with the driving circuit in the decoupling circuit is lower than a preset resistance value;

2. The parallel power device drive circuit of claim 1, wherein the decoupling circuit comprises a first inductance and a second inductance;

the first end of the first end inductor is connected with the first end of the power supply circuit, and the second end of the first inductor is connected with the first input end of the driving circuit; the first end of the second inductor is connected with the second end of the power supply circuit, and the second end of the second inductor is connected with the second input end of the driving circuit.

3. The parallel power device drive circuit of claim 2, wherein the decoupling circuit further comprises: a first resistor;

the first end of the first resistor is connected with the third end of the power supply circuit, and the second end of the first resistor is connected with the output end of the power tube to be driven.

4. The parallel power device driver circuit of claim 3, wherein the driver circuit comprises: the second resistor, the first switching tube and the second switching tube;

the control end of the first switch tube is connected with the control end of the second switch tube and the starting signal output end respectively, the input end of the first switch tube is connected with the decoupling circuit, the output end of the first switch tube is connected with the first end of the second resistor and the input end of the second switch tube, the output end of the second switch tube is connected with the decoupling circuit, and the second end of the second resistor is connected with the control end of the to-be-driven power tube.

5. The parallel power device driver circuit of claim 4, wherein the driver circuit further comprises: a first capacitor and a second capacitor;

6. The parallel power device driver circuit of claim 5, wherein the power supply circuit comprises: the power supply, the third resistor and the fourth resistor;

7. The parallel power device driver circuit of claim 6, wherein the parallel power device driver circuit further comprises: a voltage stabilizing circuit;

8. The parallel power device driver circuit of claim 7, wherein the voltage regulator circuit comprises: a first diode and a second diode;

9. A parallel power device driving apparatus, characterized in that the parallel power device driving apparatus comprises the parallel power device driving circuit of any one of claims 1-8.

10. A parallel power device driving system comprising the parallel power device driving apparatus of claim 9.