Self-regulated dc to dc converter专利检索-两级功率转换器电子功率变换器变压器和转换设备专利检索查询-专利查询网

Self-regulated dc to dc converter

阅读：448发布：2022-02-12

专利汇可以提供Self-regulated dc to dc converter专利检索，专利查询，专利分析的服务。并且A regulated power supply using square wave generator the pulse width of which is governed by an impedance controlled by the converter output. The impedance is impressed on the square wave generator through an insulating transformer with two separate secondary windings, one connected to the diode bridge output of an output voltage error detector and the other connected to the diode bridge output of an overcurrent and overvoltage protecting device; in this manner physical isolation is provided between the error detector, as well as the protecting device, and the square wave generator and thus between the output and input of the power supply. The square wave generator output operates on the control input of a separate power inverter which is also used to provide a regulated, but isolated, output for normally powering the square wave generator. Initially the square wave generator is powdered by a preregulator associated with the DC input to the converter. In addition to the conventional output pulses the square wave generator also furnishes quenching pulses to minimize the switching losses in the switching transistors of the power inverter.，下面是Self-regulated dc to dc converter专利的具体信息内容。

权利要求

1. A self-regulated DC to DC converter of the type in which the width of the pulses produced by a square wave generator including two inverters is governed by an impedance on the control side of the generator, the magnitude of which is varied under the control of the converter output, said impedance forming part of an RCtype phase displacement network interposed between said inverters; said converter comprising: a transformer having a primary winding connected to said control side of the generator and having at least two secondary windings each having the output path of a transistor connected thereacross by way of a diode bridge; error detecting apparatus for impressing a first DC control voltage on the input path of one of said transistors, said first voltage varying as a continuous function of the converter output voltage; and protecting apparatus for impressing a second DC control voltage on the input path of the other transistor, said second voltage depending on said converter being subjected to excessive electrical conditions; whereby the width of the pulses produced by said generator is governed by impedance variations in said primary winding which are due to variations of both said first and second DC voltages and, hence, of the currents flowing in said transistor output paths, and whereby physical isolation is insured between both said apparatus and said square wave generator and hence between the output and the input of said converter.

2. A self-regulated DC to DC converter as claimed in claim 1, which comprises a transistor-type power inverter controlled by the output of said square wave generator and having an output transformer with a non-saturable magnetIc core.

3. A self-regulated DC to DC converter as claimed in claim 2, wherein there are provided means for deriving from said power inverter by inductive coupling a voltage proportional to the power inverter current, and wherein said protecting apparatus comprises overload protecting means for deriving said second DC control voltage from said proportional voltage.

4. A self-regulated DC to DC converter as claimed in claim 3, wherein said overload protecting means includes circuit elements for doubler rectifying said proportional voltage and comparing the rectified product with a reference voltage.

5. A self-regulated DC to DC converter as claimed in claim 2, wherein the output transformer of said power inverter has first and second physically isolated secondary windings from which two DC sources, regulated by said converter, are derived for supplying the converter output and powering the square wave generator, respectively.

6. A self-regulated DC to DC converter as claimed in claim 5, wherein said protecting apparatus further comprises means including a diode for comparing the voltage of the last-mentioned regulated DC source with a reference voltage, said diode being poled so as to become conductive when the voltage of said DC source, as a result of an overload, drops below a predetermined level, thereby causing a marked increase in said second DC control voltage.

7. A self-regulated DC to DC converter as claimed in claim 5, wherein said protecting apparatus comprises over-voltage protecting means including a zener diode, said zener diode being connected to one side of the square wave generator power supply and becoming conductive to bring about a marked increase of said second DC control voltage when the square wave generator supply voltage exceeds a predetermined level.

8. A self-regulated DC to DC converter as claimed in claim 5, which comprises a starting circuit including preregulating means and two rectifier elements, the first of said elements being connected between one side of said square wave generator power supply and said preregulating means and the second of said elements being connected between said one side of said square wave generator power supply and said last-mentioned regulated DC source, said two rectifier elements being poled so that initially said first element is conductive and said second element non-conductive whereby said square wave generator is initially powered by said preregulating means, and that when the voltage of said regulated DC source reaches its nominal value said first element becomes non-conductive and said second element conductive whereby the powering of said square wave generator is taken over by said regulated DC source.

9. A self-regulated DC to DC converter comprising: a square wave generator of the type which includes two inverters each having a transformer and in which the phase between the pulses produced by said two inverters is varied under the control of the converter output voltage; a power inverter having two push-pull connected switching transistors, the combined pulses produced by the first-mentioned two inverters being impressed between the individual control electrodes of said two switching transistors and a common return circuit; a resistor serially interposed in said return circuit; interconnected auxiliary windings on said two transformers respectively; and a rectifier bridge having its input connected to said auxiliary windings and its output connected across said resistor; whereby quenching pulses minimizing the switching losses in said switching transistors are added to the aforementioned combined pulses.

说明书全文

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Self-regulated dc to dc converter

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