CN201789416U - Load point converter frequency conversion circuit - Google Patents
Load point converter frequency conversion circuit Download PDFInfo
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- CN201789416U CN201789416U CN2010205095857U CN201020509585U CN201789416U CN 201789416 U CN201789416 U CN 201789416U CN 2010205095857 U CN2010205095857 U CN 2010205095857U CN 201020509585 U CN201020509585 U CN 201020509585U CN 201789416 U CN201789416 U CN 201789416U
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Abstract
The utility model relates to a load point converter frequency conversion circuit, which comprises a power circuit, an output current detection circuit, an input voltage detection circuit and a frequency switching circuit. A first sampling resistor R7 samples output current signals, and the current signals are amplified in a reverse proportional manner by the aid of a first operational amplifier input resistor R1, a first reverse proportional amplifier resistor R2 and a first operational amplifier U1, compared with a second operational amplifier U2 reference Vref2 by the aid of a third operational amplifier input resistor R4, and outputted by a first operational amplifier signal output diode D1 to control a signal switch S1. A second sampling resistor R5 and a third sampling resistor R6 sample input voltage signals, and the input voltage signals are compared with a third operational amplifier U3 reference Vref1, and outputted by a second operational amplifier signal output diode D2 to control the signal switch S1. The frequency conversion circuit changes resistance of an oscillator of a first PWM chip U4 according to switching of a switch of the first signal switch S1 so as to change circuit working frequency.
Description
Technical field
The utility model relates to a kind of POL converter frequency changer circuit, relates in particular to a kind of frequency changer circuit that is applicable to POL converter pulses load applications.
Background technology
At present, distributed power supply system substitutes the centralized power system gradually, becomes the main supply power mode of modern high performance digital systems such as information, communication, also is widely used in Aeronautics and Astronautics and military field.The POL converter is a part important in the distributed power supply system structure, along with the continuous lifting of power-supply system power density, requires also more and more higher to the POL power density of transform.The POL converter in order to satisfy the requirement of big electric current output of short time, needs to increase the volume of output filter usually under the pulse load application conditions.Problem hereto, solution commonly used at present adopts crisscross parallel, the equivalence of misphase technology synchronously to improve switching frequency, reduce the electric current and voltage pulsation, thereby reduce the cumulative volume of filter, but this method circuit structure is higher than complexity and cost.
The utility model content
Technical problem to be solved:
Provide a kind of circuit simple in structure, with low cost when the POL converter is faced the heavy current pulse load applications at above not enough the utility model.The operating frequency of this circuit energy real time altering circuit effectively reduces the output filter volume, improves the power density of power supply, reduces circuit cost.
Technical scheme:
This POL converter frequency changer circuit comprises power circuit, output current detection circuit, input voltage detection circuit, frequency switching circuit;
Power circuit: the first input capacitance C1, the first output capacitance C2, second switch pipe Q2 parallel connection, be provided with the first switching tube Q1 in an anodal side and between the first input capacitance C1 and second switch pipe Q2, be provided with the first output inductor L1 in an anodal side and between the second switch pipe Q2 and the first output capacitance C2, be provided with the first sample resistance R7 in negative pole one side and between the second switch pipe Q2 and the first output capacitance C2, between the first output capacitance C2 and the first sample resistance R7, be provided with reference potential A;
Output current detection circuit: the first amplifier input resistance R1, one end is connected between the second switch pipe Q2 and the first sample resistance R7, the other end is connected the first operational amplifier U1 negative pole, the 3rd amplifier input resistance R4 one end links to each other with the first operational amplifier U1, the other end is connected in the second operational amplifier U2 positive pole, the reference voltage of the second operational amplifier U2 is Vref2, the first reverse ratio is amplified resistance R 2 one ends and is connected between the first amplifier input resistance R1 and the first operational amplifier U1, and the other end is connected between the first operational amplifier U1 and the 3rd amplifier input resistance R4; The first amplifier output signal diode D1, one end links to each other with the second operational amplifier U2, and the other end links to each other with the EN end of the first signaling switch S1;
Input voltage detection circuit: the second amplifier input resistance R3, one end links to each other with the first operational amplifier U1 is anodal, the other end links to each other with the 3rd sample resistance R6, the second amplifier input resistance R3, the 3rd sample resistance R6, second sample resistance R5 series connection, be provided with reference potential A between the second amplifier input resistance R3 and the 3rd sample resistance R6, the 3rd operational amplifier U3 positive pole is connected between the 3rd sample resistance R6 and the second sample resistance R5, and the reference voltage of the 3rd operational amplifier U3 is Vref1; First and second amplifier output signal diode D1, D2, the second amplifier output signal diode D2, one end links to each other with the 3rd operational amplifier U3, and the other end links to each other with the EN end of the first signaling switch S1;
Frequency switching circuit: the end of the first oscillator resistor Rt1 and the B of the first signaling switch S1
0End links to each other, and the other end links to each other with the Vref of a PWM chip U4, and a PWM chip U4 is UC1843; The B of the second oscillator resistor Rt2 and the first signaling switch S1
1End links to each other, and the other end links to each other with the Vref of a PWM chip U4; The Rt/Ct end of the one PWM chip U4 links to each other with the Out end of the first signaling switch S1; The first oscillator capacitor C t, one end links to each other with the Gnd end of a PWM chip U4, and the other end links to each other with the Out end of the first signaling switch S1.
Beneficial effect:
The utility model POL converter frequency changer circuit, used input voltage detection circuit, output current detection circuit, and frequency switching circuit, can adjust the switching frequency of converter according to the variation of input voltage and output current in real time, make circuit when using in the face of pulse load, need not to increase the inductance value of output inductor and the capacity of output filter capacitor, promptly adopt the electric capacity of small size inductance and lesser amt can guarantee the operate as normal of circuit, in the application of modular power source, can reduce the height of modular power source, improve the power density of module.This frequency changer circuit form is simple, uses device less, and parameter is convenient regulates, and cost is lower.
Description of drawings
Fig. 1 is the circuit diagram of POL converter frequency changer circuit.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is done explanation in further detail.
As shown in Figure 1, this POL converter frequency changer circuit comprises power circuit, output current detection circuit, input voltage detection circuit, frequency switching circuit.
Power circuit: the first input capacitance C1, the first output capacitance C2, second switch pipe Q2 parallel connection, be provided with the first switching tube Q1 in an anodal side and between the first input capacitance C1 and second switch pipe Q2, be provided with the first output inductor L1 in an anodal side and between the second switch pipe Q2 and the first output capacitance C2, be provided with the first sample resistance R7 in negative pole one side and between the second switch pipe Q2 and the first output capacitance C2, between the first output capacitance C2 and the first sample resistance R7, be provided with reference potential A.
Output current detection circuit: the first amplifier input resistance R1, one end is connected between the second switch pipe Q2 and the first sample resistance R7, the other end is connected the first operational amplifier U1 negative pole, the 3rd amplifier input resistance R4 one end links to each other with the first operational amplifier U1, the other end is connected in the second operational amplifier U2 positive pole, the reference voltage of the second operational amplifier U2 is Vref2, the first reverse ratio is amplified resistance R 2 one ends and is connected between the first amplifier input resistance R1 and the first operational amplifier U1, and the other end is connected between the first operational amplifier U1 and the 3rd amplifier input resistance R4; The first amplifier output signal diode D1, one end links to each other with the second operational amplifier U2, and the other end links to each other with the EN end of the first signaling switch S1.
Input voltage detection circuit: the second amplifier input resistance R3, one end links to each other with the first operational amplifier U1 is anodal, the other end links to each other with the 3rd sample resistance R6, the second amplifier input resistance R3, the 3rd sample resistance R6, second sample resistance R5 series connection, be provided with reference potential A between the second amplifier input resistance R3 and the 3rd sample resistance R6, the 3rd operational amplifier U3 positive pole is connected between the 3rd sample resistance R6 and the second sample resistance R5, and the reference voltage of the 3rd operational amplifier U3 is Vref1; First and second amplifier output signal diode D1, D2, the second amplifier output signal diode D2, one end links to each other with the 3rd operational amplifier U3, and the other end links to each other with the EN end of the first signaling switch S1.
Frequency switching circuit: the end of the first oscillator resistor Rt1 and the B of the first signaling switch S1
0End links to each other, and the other end links to each other with the Vref of a PWM chip U4 (UC1843); The B of the second oscillator resistor Rt2 and the first signaling switch S1
1End links to each other, and the other end links to each other with the Vref of a PWM chip U4; The Rt/Ct end of the one PWM chip U4 links to each other with the Out end of the first signaling switch S1; The first oscillator capacitor C t, one end links to each other with the Gnd end of a PWM chip U4, and the other end links to each other with the Out end of the first signaling switch S1.
The first sample resistance R7 output current signal of sampling, by the first amplifier input resistance R1, the first reverse ratio amplifies resistance R 2 and the first amplifier U1 carries out reverse ratio amplification to current signal, compare with the second amplifier U2 benchmark Vref2 through the 3rd amplifier input resistance R4, by first amplifier output signal diode D1 output, control signal switch S 1;
Second and third sample resistance R5, the R6 input voltage signal of sampling, through the 3rd operational amplifier U3 benchmark Vref1 relatively after, by second amplifier output signal diode D2 output, control signal switch S 1; When EN=0, the B0 of switch S 1 connects, and when EN=1, the B1 of switch S 1 connects.
Thereby frequency switching circuit changes the operating frequency of the oscillator resistor change circuit of a PWM chip U4 according to the switching of switch among the first signaling switch S1.Be reference potential with A in this circuit.
Claims (1)
1. this POL converter frequency changer circuit is characterized in that: comprise power circuit, output current detection circuit, input voltage detection circuit, frequency switching circuit;
Power circuit: the first input capacitance C1, the first output capacitance C2, second switch pipe Q2 parallel connection, be provided with the first switching tube Q1 in an anodal side and between the first input capacitance C1 and second switch pipe Q2, be provided with the first output inductor L1 in an anodal side and between the second switch pipe Q2 and the first output capacitance C2, be provided with the first sample resistance R7 in negative pole one side and between the second switch pipe Q2 and the first output capacitance C2, between the first output capacitance C2 and the first sample resistance R7, be provided with reference potential A;
Output current detection circuit: the first amplifier input resistance R1, one end is connected between the second switch pipe Q2 and the first sample resistance R7, the other end is connected the first operational amplifier U1 negative pole, the 3rd amplifier input resistance R4 one end links to each other with the first operational amplifier U1, the other end is connected in the second operational amplifier U2 positive pole, the reference voltage of the second operational amplifier U2 is Vref2, the first reverse ratio is amplified resistance R 2 one ends and is connected between the first amplifier input resistance R1 and the first operational amplifier U1, and the other end is connected between the first operational amplifier U1 and the 3rd amplifier input resistance R4; The first amplifier output signal diode D1, one end links to each other with the second operational amplifier U2, and the other end links to each other with the EN end of the first signaling switch S1;
Input voltage detection circuit: the second amplifier input resistance R3, one end links to each other with the first operational amplifier U1 is anodal, the other end links to each other with the 3rd sample resistance R6, the second amplifier input resistance R3, the 3rd sample resistance R6, second sample resistance R5 series connection, be provided with reference potential A between the second amplifier input resistance R3 and the 3rd sample resistance R6, the 3rd operational amplifier U3 positive pole is connected between the 3rd sample resistance R6 and the second sample resistance R5, and the reference voltage of the 3rd operational amplifier U3 is Vref1; First and second amplifier output signal diode D1, D2, the second amplifier output signal diode D2, one end links to each other with the 3rd operational amplifier U3, and the other end links to each other with the EN end of the first signaling switch S1;
Frequency switching circuit: the end of the first oscillator resistor Rt1 links to each other with the Bo end of the first signaling switch S1, and the other end links to each other with the Vref of a PWM chip U4, and a PWM chip U4 is UC1843; The second oscillator resistor Rt2 links to each other with the B1 end of the first signaling switch S1, and the other end links to each other with the Vref of a PWM chip U4; The Rt/Ct end of the one PWM chip U4 links to each other with the Out end of the first signaling switch S1; The first oscillator capacitor C t, one end links to each other with the Gnd end of a PWM chip U4, and the other end links to each other with the Out end of the first signaling switch S1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205095857U CN201789416U (en) | 2010-08-27 | 2010-08-27 | Load point converter frequency conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205095857U CN201789416U (en) | 2010-08-27 | 2010-08-27 | Load point converter frequency conversion circuit |
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|---|---|
| CN201789416U true CN201789416U (en) | 2011-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205095857U Expired - Fee Related CN201789416U (en) | 2010-08-27 | 2010-08-27 | Load point converter frequency conversion circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103259394A (en) * | 2013-05-31 | 2013-08-21 | 东莞铭普光磁股份有限公司 | Adjunct circuit of frequency-conversion and phase-shifted full-bridge converter |
| WO2014028301A1 (en) * | 2012-08-13 | 2014-02-20 | Northrop Grumman Systems Corporation | Multiple power supply systems and methods |
| US9143028B2 (en) | 2012-08-13 | 2015-09-22 | Northrop Grumman Systems Corporation | Power supply systems and methods |
| CN113342116A (en) * | 2021-06-30 | 2021-09-03 | 合肥博雷电气有限公司 | Voltage reference setting circuit capable of being adjusted in program control mode and hardware equipment |
-
2010
- 2010-08-27 CN CN2010205095857U patent/CN201789416U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014028301A1 (en) * | 2012-08-13 | 2014-02-20 | Northrop Grumman Systems Corporation | Multiple power supply systems and methods |
| US9143028B2 (en) | 2012-08-13 | 2015-09-22 | Northrop Grumman Systems Corporation | Power supply systems and methods |
| US9281749B2 (en) | 2012-08-13 | 2016-03-08 | Northrop Grumman Systems Corporation | Multiple power supply systems and methods |
| US9413220B2 (en) | 2012-08-13 | 2016-08-09 | Northrop Grumman Systems Corporation | Power supply systems and methods |
| US9653982B2 (en) | 2012-08-13 | 2017-05-16 | Northrop Grumman Systems Corporation | Power supply systems and methods |
| CN103259394A (en) * | 2013-05-31 | 2013-08-21 | 东莞铭普光磁股份有限公司 | Adjunct circuit of frequency-conversion and phase-shifted full-bridge converter |
| CN113342116A (en) * | 2021-06-30 | 2021-09-03 | 合肥博雷电气有限公司 | Voltage reference setting circuit capable of being adjusted in program control mode and hardware equipment |
| CN113342116B (en) * | 2021-06-30 | 2023-08-04 | 合肥博雷电气有限公司 | Voltage reference setting circuit capable of being adjusted in program control mode and hardware equipment |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110406 Termination date: 20130827 |