Analysis of Common Defects of IGBT Induction Heating Equipment

Induction heating equipment with IGBT structure , the heating power supply of this structure can maintain high efficiency for a long time, and the safety is relatively high, so it is more popular among manufacturers and consumers. however. There are still some common problems and defects in induction heating equipment .

The defects and problems of the common IGBT heating power supply in the actual application process are mainly as follows:

1. The working efficiency is reduced after long-term application, and the power consumption and cooling water consumption are large;

2, the power component IGBT is very easy to damage;

3, the reactor or output transformer is easy to damage;

4, the cooling water circuit is prone to failure;

5, the heating power supply has a lower power factor and a large harmonic pollution;

6, equipment reliable continuous operation performance is not good.

The above problems occur in the course of operation, and the main reason is that there are defects in the design. Now we will further explore the reasons for these problems. The first is the problem of large consumption of electric energy and cooling water. Since IGBT, reactor, output transformer and resonant capacitor adopt water-cooling structure, not only the loss is large, the efficiency is low, the cooling water consumption is large, and it is easy to occur because of copper tube scaling. Blockage causes the device to burn out, and it is also prone to problems such as water leakage and widening of the fault range . Because the waterway has many parallel branches, the system cannot guarantee that each branch has the function of water cut protection.

The IGBT power component is prone to damage, because the analog control circuit can not adapt to various changing conditions, so that the power component IGBT is out of the zero-cross soft-switching state, so the switching loss increases and the power component IGBT is damaged. The pulse width modulation type (chopperless voltage regulation) uses a soft-on, hard-off or buffered hard-off circuit, so the IGBT loss is large, and this method is easy to break away from the soft-switching state and cause IGBT damage.

Analysis of Common Defects of IGBT Induction Heating Equipment

Induction heating equipment with IGBT structure , the heating power supply of this structure can maintain high efficiency for a long time, and the safety is relatively high, so it is more popular among manufacturers and consumers. however. There are still some common problems and defects in induction heating equipment .

The defects and problems of the common IGBT heating power supply in the actual application process are mainly as follows:

1. The working efficiency is reduced after long-term application, and the power consumption and cooling water consumption are large;

2, the power component IGBT is very easy to damage;

3, the reactor or output transformer is easy to damage;

4, the cooling water circuit is prone to failure;

5, the heating power supply has a lower power factor and a large harmonic pollution;

6, equipment reliable continuous operation performance is not good.

The above problems occur in the course of operation, and the main reason is that there are defects in the design. Now we will further explore the reasons for these problems. The first is the problem of large consumption of electric energy and cooling water. Since IGBT, reactor, output transformer and resonant capacitor adopt water-cooling structure, not only the loss is large, the efficiency is low, the cooling water consumption is large, and it is easy to occur because of copper tube scaling. Blockage causes the device to burn out, and it is also prone to problems such as water leakage and widening of the fault range . Because the waterway has many parallel branches, the system cannot guarantee that each branch has the function of water cut protection.

The IGBT power component is prone to damage, because the analog control circuit can not adapt to various changing conditions, so that the power component IGBT is out of the zero-cross soft-switching state, so the switching loss increases and the power component IGBT is damaged. The pulse width modulation type (chopperless voltage regulation) uses a soft-on, hard-off or buffered hard-off circuit, so the IGBT loss is large, and this method is easy to break away from the soft-switching state and cause IGBT damage.

Output transformers and reactors are also susceptible to damage during operation of IGBT induction heating equipment . The reason for the failure or damage of the two is due to the fact that the control circuit cannot effectively limit and protect the device under the conditions of overvoltage, overload, short circuit or partial short circuit of the induction coil, overheating of the power component, etc. Under such conditions, the reactance is easily caused. The output transformer or output transformer is susceptible to damage. A device with parallel resonance mode is prone to overvoltage of the inverter unit and damage the device. After rectification, large-capacity power capacitor filtering is adopted directly, and there is no filter inductor or DC side IGBT chopper circuit, so the power factor is low and the input current harmonic is large.

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