JPH0186487U - - Google Patents

Description

[Brief explanation of the drawing]

Figure 1 shows the configuration of an embodiment of the present invention, Figures 2 and 3.
The figure shows an explanatory diagram of operating waveforms, FIG. 4 shows a temperature protection circuit of a conventional inverter circuit, and FIG. 5 shows an explanatory diagram of its waveforms. In the figure, 11 is an AC voltage generation section, 12 is a drive pulse generation section, 13 is a discharge circuit section, 14 is an integration circuit section, 15 is a temperature detection section, 16 is a comparison circuit section, 17 is a pulse absorption circuit section, and Tr ₁ to Tr ₇ are transistors, D ₁ to D ₄ are diodes, OP is an operational amplifier, Rx is a positive temperature sensitive resistance element, R _1
R3 represents a resistor, and C represents a capacitor.

Claims (1)

[Claims for Utility Model Registration] Two transistors Tr ₁ and Tr ₄ and Tr ₂
and Tr ₃ are connected in series, respectively, and
These transistors Tr ₁ to Tr ₄ are connected in a bridge shape to form a pair of transistors Tr ₁
and Tr ₃ and transistors Tr ₂ and Tr ₄ alternately turn on and _off to generate an alternating current voltage. T
In an inverter circuit that generates an alternating current voltage of a predetermined frequency using a direct current voltage, the inverter circuit includes a driving pulse generating section that alternately turns on the transistors Tr1 to _{Tr4 ,} and is responsive to the ambient temperature near the transistors Tr1 to _Tr4 . a temperature detection section equipped with a positive temperature sensitive resistance element whose value changes in accordance with temperature; an integration circuit section that generates a lamp voltage in synchronization with each pulse generated by the drive pulse generation section; and the temperature detection section. a comparison circuit section that uses a proportionally divided voltage as a reference voltage and compares the reference voltage with the lamp voltage of the integration circuit section; and transistors _Tr3 and T of the AC voltage generation section.
Based on the pulses of the drive pulse generating section that turns on _r4 alternately, reset/reset is performed in response to each pulse generation.
a discharge circuit section that generates a pulse and resets the lamp voltage of the integration circuit section with the reset pulse; and a discharge circuit section that turns on transistors Tr ₃ and Tr ₄ of the AC voltage generation section based on the output of the comparison circuit section. 1. A temperature protection circuit device using phase control of an inverter circuit, comprising a pulse absorption circuit section that shifts the timing of turning off the state.