dcdc converter
A converter and switching unit technology, applied in output power conversion devices, instruments, DC power input to DC power output, etc., can solve problems such as slow speed and damage to DCDC converters, and achieve the effect of suppressing overshoot voltage
Inactive Publication Date: 2015-10-07
RICOH MICROELECTRONICS CO LTD
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- Abstract
- Description
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- Application Information
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Problems solved by technology
However, in the DCDC converter 1 of the prior art, there will be a certain delay for the Vpwm signal to return to the normal working state. The main reason for this delay is that Verror2 will be amplified with the output stage at the moment when the DCDC converter 1 releases the current limiting mode. The discharge of the unit decreases, but the discharge speeds of N3 of the input stage unit 12 and N4 of the output stage amplifying unit 13 are limited by the bias voltage Vbias, resulting in the decrease of the output voltage signal Verror2 of the output stage amplifying unit 13 slower (see image 3 slow speed in
During this delay time, the energy storage element 17 continues to store energy, thus generating an overshoot of VOUT
This overshoot may damage the DCDC converter 1 and its surrounding components
Method used
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Embodiment Construction
[0028] Embodiments of the DCDC converter according to the present invention will be described with reference to the drawings.
[0029] Figure 5 It is a circuit configuration diagram of a DCDC converter according to an embodiment of the present invention. Such as Figure 5 As shown, the DCDC converter 2 of the embodiment of the present invention has: a sampling feedback unit 11, such as a voltage dividing resistor network with two series resistors R1, R2, one end of which is connected to the voltage output terminal VOUT of the DCDC converter 2 , the other end of which is connected to the ground; the differential amplifier input stage unit 12, whose first input end is connected to the sampling feedback unit 11, samples the output voltage VOUT of the DCDC converter 2, and its second input end inputs the reference voltage Vref The differential input amplifier stage unit 12 is used to compare and amplify the difference between the sampling voltage Vfb of the output voltage VOUT ...
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The invention provides a direct-current-to-direct-current (DCDC) converter which can restrain overshoot voltage generated when the DCDC converter is converted from a current-limiting mode to a normal working mode. The DCDC converter comprises a sampling feedback unit, a differential input grade amplification unit and an output grade amplification unit, wherein one end of the sampling feedback unit outputs output voltage of the DCDC converter, the other end of the sampling feedback unit is connected with the ground, a first input end of the differential input grade amplification unit is connected in the sampling feedback unit to sample the output voltage of the DCDC converter, a second input end of the differential input grade amplification unit inputs standard voltage, the differential input grade amplification unit conducts comparison and amplification on a difference of sampling voltage of the output voltage of the DCDC converter and the standard voltage of the DCDC converter, amplification voltage signals of the difference are output, the output grade amplification unit is provided with a first switching circuit and a second switching circuit, the first switching circuit and the second switching circuit are connected when overcurrent occurs in the DCDC converter, and the first switching circuit and the second switching circuit are disconnected when the DCDC converter normally works, namely no overcurrent occurs.
Description
technical field [0001] The present invention relates to a DC-DC converter, more specifically to a DC-DC converter capable of suppressing the overshoot voltage that occurs when it enters a normal working mode from a current-limiting mode. Background technique [0002] DCDC converter refers to the use of the energy storage characteristics of capacitors and inductors to perform high-frequency switching actions through controllable switches (MOSFETs, etc.), and store the input electric energy in capacitors (inductors), and then release it to the load through capacitors, providing energy. Its output power or voltage capability is related to the duty cycle (the ratio of the switch conduction time to the entire switch cycle). DCDC converters can be used for both step-up and step-down. [0003] figure 1 It is a schematic configuration block diagram of a conventional DCDC converter. figure 2 It is a related circuit structure diagram in the DCDC converter in the prior art. exist...
Claims
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IPC IPC(8): H02M3/156H02M1/32
Inventor 赵大雨
Owner RICOH MICROELECTRONICS CO LTD