CN207884494U - A kind of positive-negative power generation circuit suitable for IGBT drivings - Google Patents

Abstract

The utility model discloses a kind of positive-negative power generation circuits suitable for IGBT drivings,It is related to IGBT drive circuit,Solve in the prior art Zener diode come the technical problems such as voltage stabilized range when generating positive-negative power is limited,It includes input power,Voltage stabilizing chip,Zener diode and resistance,There are two coupling capacitors for connection between input power,Node connection between the anode of Zener diode and the capacitor C2 and capacitor C3,The plus earth of Zener diode,One end of its cathode and resistor connects,The other end of resistor is connected to input voltage,Input voltage and the input terminal of voltage stabilizing chip connect,Node between resistor and Zener diode cathode is connected with the signal ground of voltage stabilizing chip,The low-voltage output of the output end connection positive-negative power generation circuit of voltage stabilizing chip,Low-voltage output is connected with capacitor C1,The other end of capacitor C1 is grounded.The structure design of the utility model is reasonable, is easy to manufacture, and voltage regulation result is good.

Description

A kind of positive-negative power generation circuit suitable for IGBT drivings

Technical field

The utility model is related to IGBT drive circuits, more particularly to a kind of positive-negative power suitable for IGBT drivings Generation circuit.

Background technology

Capacitance and spike problem caused by the Miller effect in the daily work, belong to a kind of relatively common situation. In IGBT module operation, if without timely processing miller capacitance problem, it is easy to IGBT be caused to damage.Daily worked Once there are the parasitic capacitance problems of the Miller effect when operating in Cheng Zhong, IGBT module, and often see and significantly arrive 15V classes 0 The gate driver of type, that is, single supply driver that engineers are often said.It is coupling in IGBT shutdowns between door collection-electrode Period, high du/dt transient states can induce the parasitism roads IGBT and lead to, that is, door collecting voltage spike, this for IGBT or even complete machine, All it is a kind of potential danger.Under normal conditions, the case where occurring the parasitism channels IGBT in order to prevent occurs, and usually there are three types of solutions Certainly method.First method is the capacitance between configuration addition gate pole and emitter, and second is by using negative gate voltage Driving, third are to change gate electrode resistance.If using first scheme, driving power power consumption can be made to increase, identical door The switching loss of IGBT can also increase in the case of pole driving resistance.Second scheme then needs to ask in view of extra charge and cost Topic.The third method can increase turn-on consumption.

Driving power is excessively high when IGBT module works can cause short circuit current excessive, or even breakdown IGBT grids, too low meeting Cause IGBT fevers serious, reduces the IGBT service life.And due to the presence of parasitic miller capacitance, high shutdown du/dt can give grid Charging, causes IGBT to open by mistake logical, it is therefore desirable to which a negative supply reliably turns off.In the prior art, two pole of Zener is generally used Pipe generates positive-negative power, and Zener diode voltage stabilized range is limited, and voltage regulation result will reduce when input power fluctuates.

Utility model content

The purpose of this utility model is that：There is provided one kind can be when IGBT drives input power fluctuation range excessive, drop The positive-negative power generation circuit for being suitable for IGBT drivings of the fluctuation of low out-put supply.

The utility model specifically uses following technical scheme to achieve the goals above：

A kind of positive-negative power generation circuit suitable for IGBT drivings, including input power, voltage stabilizing chip, Zener diode With resistance R1, there are two coupling capacitors for connection between the input power, connect between capacitor C2 and capacitor C3, described Node connection between the anode of Zener diode and the capacitor C2 and capacitor C3, the anode of the Zener diode connect Ground, cathode are connect with one end of resistance R1, and the other end of the resistance R1 is connected to input voltage, input voltage with it is described steady Press the input terminal connection of chip, the signal ground of node and the voltage stabilizing chip between the resistance R1 and Zener diode cathode It is connected, the low-voltage output Vo of the output end connection positive-negative power generation circuit of the voltage stabilizing chip, low-voltage output Vo connect It is connected to capacitor C1, the other end ground connection of capacitor C1.

Operation principle：IGBT drives input power to concatenate two derided capacitors C2 and C3, resistance R1 and Zener diode string It is connected in parallel on one of electric capacity of voltage regulation C2 after connection connection, takes resistance R1 both end voltages as the input of voltage stabilizing chip, voltage stabilizing core Piece output end connects filter condenser C1 to the ends capacitor C2, and capacitor C1 both end voltages Vo is exactly to export positive supply, capacitor C3 both end voltages are exactly to export negative supply.When input power fluctuates, as long as more than the minimum voltage of Zener diode, voltage-stablizer Output positive supply Vo and negative supply can be stablized.

The beneficial effects of the utility model：Compared with prior art, the present invention utilizes the wide input voltage model of voltage stabilizing chip It encloses, high-precision voltage stabilizing output, as long as supply voltage is higher than the minimum voltage of Zener diode, so that it may to obtain stable output electricity Pressure, thus expands input power fluctuation range, also solves the problems, such as output pulsation.

Description of the drawings

Fig. 1 is the structural schematic diagram of the utility model.

Specific implementation mode

To make the purpose of this utility model, technical solution and advantage be more clearly understood, with reference to embodiment and attached drawing, The utility model is described in further detail, and the exemplary embodiment and its explanation of the utility model are only used for explaining this Utility model is not intended to limit the scope of the present invention.

As shown in Figure 1, this implementation provides a kind of positive-negative power generation circuit suitable for IGBT drivings, including input electricity Source, voltage stabilizing chip U1, Zener diode Zd and resistance R1, there are two coupling capacitor, capacitances for connection between the input power It connects between device C2 and capacitor C3, the anode of the Zener diode Zd is connected to the section between capacitor C2 and capacitor C3 On point, the Zener diode Zd plus earths, cathode is connect with one end of resistance R1, the other end connection of the resistance R1 It is connect to input voltage VSS, input voltage VSS with the input terminal vin of the voltage stabilizing chip U1, the resistance R1 and two pole of Zener Node between pipe Zd cathodes is connected with the signal ground gnd of the voltage stabilizing chip U1, the output end of the voltage stabilizing chip U1 The low-voltage output Vo of vout connection positive-negative power generation circuits, low-voltage output Vo are connected with capacitor C1, capacitor C1's The other end is grounded.

In the present embodiment, IGBT drives input power to concatenate two derided capacitors C2 and C3, resistance R1 and Zener diode Zd is connected in parallel on after being connected in series on one of electric capacity of voltage regulation C2, takes resistance R1 both end voltages as the input of voltage stabilizing chip U1, For voltage stabilizing chip output end vout connection filter condenser C1 to the ends capacitor C2, capacitor C1 both end voltages Vo is exactly to export positive electricity Source, capacitor C3 both end voltages are exactly to export negative supply.When input power fluctuates, as long as minimum more than Zener diode Zd Voltage, voltage-stablizer can stablize output positive supply Vo and negative supply.

The above, the only preferred embodiment of the utility model, are not intended to limit the utility model, the utility model Scope of patent protection be subject to claims, it is equivalent made by every specification and accompanying drawing content with the utility model Structure change similarly should be included in the scope of protection of the utility model.

Claims (1)

1. a kind of positive-negative power generation circuit suitable for IGBT drivings, it is characterised in that：Including input power (VSS；GND)、 Voltage stabilizing chip U1, Zener diode Zd and resistance R1, the input power (VSS；GND there are two coupling capacitors for connection between) (C2, C3) connects between capacitor C2 and capacitor C3, and the anode of the Zener diode Zd is connected to capacitor C2 and capacitance On node between device C3, the Zener diode Zd plus earths, cathode is connect with one end of resistance R1, the resistance R1 The other end be connected to input voltage VSS, input voltage VSS is connect with the input terminal vin of the voltage stabilizing chip U1, the resistance Node between R1 and Zener diode Zd cathodes is connected with the signal ground gnd of the voltage stabilizing chip U1, the voltage stabilizing chip The low-voltage output Vo of the output end vout connection positive-negative power generation circuits of U1, low-voltage output Vo are connected with capacitor C1, The other end of capacitor C1 is grounded.