A dc/dc converter whose output voltage and regulated voltage satisfy the relationship of y=kx+b
A technology for adjusting voltage and output voltage, which is applied to output power conversion devices, conversion equipment without intermediate conversion to AC, DC power input conversion to DC power output, etc. Insufficient optical coupling feedback and other problems, to achieve the effect of improving load capacity, simple constant determination, and good system stability
Active Publication Date: 2017-07-21
SHAANXI HUAJING MICRO ELECTRONICS CO LTD
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Problems solved by technology
Although this scheme satisfies the mathematical relationship of y=kx+b, it also has its shortcomings, which will affect the size of the adjustable range and the stability of the overall DC / DC power supply
[0009] Disadvantage 1: When changing the output voltage, since the three components at the output high potential end and low potential end are connected in series, the maximum current limited by the current limiting resistor will change
For example, when the output voltage is adjusted higher, the maximum current in the series circuit will increase, and for the optocoupler or power reference, there is a maximum current limit, and the output voltage is adjusted too high, which will burn the circuit; when After the output voltage is lowered, the maximum current in the series loop becomes smaller. When the output voltage dynamically changes to a higher level and the optical coupler needs to increase the current transmission, because the maximum current becomes smaller at this time, the optocoupler feedback is insufficient and the pulse width is not narrowed enough. Finally, the output is out of control, and the output voltage is higher than the adjusted value and unstable
[0010] Disadvantage 2: Since the main working principle of this scheme is to change the input current of the reference terminal, the adjustment method is performed at the reference terminal, and in the DC / DC power supply, the reference terminal will set the feedback loop of the entire circuit. For the forward type, it is generally a type 2 compensation network
The resistance and external adjustment voltage added here will change the zero point, pole and DC gain of the type 2 compensation network, so that the phase margin and DC gain of the entire system compensation will change. Once the phase margin is less than 45 degrees or If the gain slope of the total open-loop gain near the shear frequency does not meet -20dB / 10 frequency range, the entire power system is in an unstable state
[0011] In addition, due to the limitation of the output current of the microcontroller and the D / A converter, it will make R DAC The value selection of the adjustment resistor is limited, and the adjustment range will also be limited
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[0033] The present invention will be further described below through the embodiments and in conjunction with the accompanying drawings.
[0034] see Image 6 . In this scheme, in the output circuit part of the DC / DC converter, the ground terminal of the buffer isolator (IC3) is connected to the output low potential end, the external adjustable voltage is connected to the non-inverting input end of the buffer isolator, and the output high potential end The current limiting resistor (R1), the photocoupler (IC1) and the power reference (IC2) are connected in series between the output terminal of the buffer isolator, and the reference terminal of the power reference is connected to two voltage dividing resistors (R2 , R3) between the output high potential end and the anode of the power reference.
[0035]When the adjustable voltage is 0V, according to the working principle of the buffer isolator, its output voltage is also 0V, then the feedback reference part of the circuit at t...
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The invention provides a DC / DC converter with output voltage and regulating voltage meeting the equation y=kx+b. By means of the stability of a power reference of an output circuit in the DC / DC converter, the voltage between an output voltage hot end and the anode of a reference circuit is a fixed value, the anode potential of the reference circuit is changed by enabling external adjustable voltage to pass through a buffer isolator, so that the output voltage is equal to the value obtained after the external adjustable voltage is added to the fixed value in a certain proportion, and then the purpose that adjustable output is the sum of a fixed value and a certain proportion of regulating voltage is realized. According to the DC / DC converter, a special relationship requirement for automatic adjustment of the output voltage of the DC / DC converter in the current stage of industrial automation is met though an analog circuit, and the requirement is mainly about changing the output voltage of the DC / DC converter automatically through a single-chip microcomputer and the adjustable voltage output by the DC / DC converter and making the output voltage and the adjustable voltage meet the equation y=kx+b, so that the load capacity of the external adjustable voltage is improved on the premise that the stability of a system is not changed.
Description
technical field [0001] The present invention relates to analog electronics DC / DC converter technology. Background technique [0002] As the application range of the DC / DC converter becomes wider and wider, the application mode in which the output voltage is continuously adjustable by external control is becoming more and more popular. At present, in industrial applications, there are mainly two external control methods: one is to achieve continuous adjustment of the output voltage by manually changing the external resistance; The output voltage of the DC / DC converter. [0003] There are mainly two ways to achieve continuous adjustment of the output voltage by changing the external resistance. One is to change the internal reference voltage by changing the external resistance to change the output voltage. See figure 1 ; The other is to change the output voltage by changing the external resistance to change the internal voltage divider resistance, see figure 2 with image...
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IPC IPC(8): H02M3/04
CPCH02M3/1584
Inventor毛国华张登峰胡元姜耀升
OwnerSHAANXI HUAJING MICRO ELECTRONICS CO LTD