Control device of switching device and control device of driving circuit of motor
First Claim
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1. A control device of switching devices, comprising:
- driving devices configured to performing drive and control of said switching devices;
a snubber circuit configured to suppress a surge voltage generated during a switching operation of said switching devices;
a voltage detection device configured to detect a voltage between main electrodes of said switching devices;
a detected voltage monitoring device configured to monitor the voltage detected by said voltage detection device to detect said surge voltage; and
control state changing devices configured to change a control state of said switching devices based on instructions provided from said detected voltage monitoring device, whereinsaid detected voltage monitoring device has first and second predetermined values to be compared with said surge voltage, and suppresses said surge voltage by;
a provision of instructions to said control state changing devices so that a transition of the control state of said switching devices takes place from a normal control state to a first control state when said surge voltage exceeds said first predetermined value, anda provision of instructions to said control state changing devices so that a transition of the control state of said switching devices takes place from said first control state to a second control state when said surge voltage exceeds said second predetermined value while said switching devices are in said first control state.
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Abstract
A control device includes a capacitor disposed between P–N lines and constituting a snubber circuit, and a voltage detection resistor for detecting a voltage between the P–N lines by dividing resistances to detect surge voltages of transistors, in which gate control signals are provided from drivers to the transistors through gate resistance variable devices, respectively. The gate resistance variable devices include variable resistors, respectively, and the resistance values of the variable resistors are controlled based on variable resistor control signals provided from a detected voltage monitoring device, respectively.
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9 Claims
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1. A control device of switching devices, comprising:
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driving devices configured to performing drive and control of said switching devices; a snubber circuit configured to suppress a surge voltage generated during a switching operation of said switching devices; a voltage detection device configured to detect a voltage between main electrodes of said switching devices; a detected voltage monitoring device configured to monitor the voltage detected by said voltage detection device to detect said surge voltage; and control state changing devices configured to change a control state of said switching devices based on instructions provided from said detected voltage monitoring device, wherein said detected voltage monitoring device has first and second predetermined values to be compared with said surge voltage, and suppresses said surge voltage by; a provision of instructions to said control state changing devices so that a transition of the control state of said switching devices takes place from a normal control state to a first control state when said surge voltage exceeds said first predetermined value, and a provision of instructions to said control state changing devices so that a transition of the control state of said switching devices takes place from said first control state to a second control state when said surge voltage exceeds said second predetermined value while said switching devices are in said first control state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification