A buck-boost switching voltage regulator
A switching voltage and regulator technology, which is applied in the direction of instruments, electrical components, and adjusting electrical variables, etc., can solve the problems of unprogrammable output voltage and complicated control principle, and achieve stable output voltage, small chip area, and less peripheral components.
Active Publication Date: 2016-08-24
AOTEYI NANJING ELECTRONICS SCI & TECH
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Problems solved by technology
However, these two types of implementation methods have their own disadvantages. The output voltage of the former cannot be programmed, and the latter requires additional voltage detection circuits, comparators and other circuits, requiring a larger chip area and complex control principles.
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[0016] The present invention will be further described below in conjunction with drawings and embodiments.
[0017] Such as figure 1 , one A BUCK-BOOST switching voltage regulator that automatically recognizes the working mode, the chip includes a voltage reference circuit, a clock circuit, an internal power supply circuit, a current sampling circuit, a logic control circuit, a drive circuit and a power stage circuit, a voltage reference circuit, a clock circuit , the signal output ends of the internal power supply circuit and the current sampling circuit are respectively connected with the signal input ends of the logic control circuit; it is characterized in that: the logic control circuit includes an error amplifier, a voltage level converter, a comparator, an RS flip-flop, a D The trigger, the AND gate, the NAND gate and the inverter, the signal output end of the logic control circuit are connected to the signal input end of the driving circuit, and the signal output end...
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The invention discloses a BUCK-BOOST switching voltage regulator, which comprises a voltage reference circuit, a clock circuit, an internal power supply circuit, a current sampling circuit, a logic control circuit, a drive circuit and a power stage circuit, a voltage reference circuit, a clock circuit, an internal The signal output ends of the power supply circuit and the current sampling circuit are respectively connected to the signal input ends of the logic control circuit; the logic control circuit includes an error amplifier, a voltage level shifter, a comparator, an RS flip-flop, a D flip-flop, an AND gate, The NAND gate and the inverter, the signal output end of the logic control circuit are connected to the signal input end of the driving circuit, and the signal output end of the driving circuit is connected to the signal input end of the power stage circuit. The invention enables the BUCK-BOOST monolithic voltage regulator to automatically identify the working area according to different input and output voltages.
Description
technical field [0001] The invention relates to the field of analog integrated circuits, in particular to a BUCK-BOOST switching voltage regulator. Background technique [0002] In the field of automotive electronics applications, entertainment systems such as car radios and CDs require a stable switching power supply voltage (such as 8V). Generally, the voltage of the car battery is 14V higher than 8V (only the step-down voltage regulator can meet the demand at this time), but when the car is in start-stop or cranking, the voltage of the car battery will be reduced to 3~6V (the system needs to Boost voltage regulator), so in order to meet the above requirements, the application circuit needs to integrate BUCK and BOOST voltage modulator chips at the same time, but this application has the disadvantages of many peripheral components and high cost. In order to further meet the above applications and reduce costs, BUCK-BOOST voltage regulators and a voltage regulator called S...
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IPC IPC(8): H02M3/157
Inventor 白文利郑鲲鲲王飞
Owner AOTEYI NANJING ELECTRONICS SCI & TECH