CN110572015A - VRM phase number expander circuit based on coupling inductance - Google Patents
VRM phase number expander circuit based on coupling inductance Download PDFInfo
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- CN110572015A CN110572015A CN201910870857.1A CN201910870857A CN110572015A CN 110572015 A CN110572015 A CN 110572015A CN 201910870857 A CN201910870857 A CN 201910870857A CN 110572015 A CN110572015 A CN 110572015A
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- phase
- circuit
- control signal
- frequency division
- vrm
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
Abstract
A VRM phase number expansion circuit based on coupling inductance comprises a PWM controller, a phase number expansion circuit and a phase number expansion circuit, wherein the PWM controller is used for outputting a PWM control signal; the frequency divider is internally provided with a frequency dividing circuit and is electrically connected with the PWM controller, and is used for dividing the frequency of the PWM control signal to form and output a frequency dividing control signal; the power supply comprises N-phase sub-circuits, wherein each phase sub-circuit is provided with a power chip; the sub-circuits are even phases, the power chips are DrMOS power chips, and in the embodiment, the sub-circuits are 4 phases; the power chip is used for receiving the frequency division control signal to realize switching on and outputting an output current i; the output current i of the power chip in each two-phase sub-circuit flows through the same coupling inductor, and the phase difference of the frequency division control signals received by the power chips in the two-phase sub-circuit is 180 degrees. The invention can balance each phase current and ensure the reliability and stability of the VRM circuit on the premise of ensuring the current intensity.
Description
Technical Field
the invention relates to the field of processor core power supply VRM circuits, in particular to a VRM phase expansion circuit based on coupling inductance.
background
with the development of semiconductor technology, the power consumption of a processor core continuously increases, the power supply voltage continuously decreases, and the core current is larger and larger, which presents a serious challenge to the power supply design of a high-power processor core. Currently, the multiphase interleaving synchronous rectification BUCK circuit is commonly used in the industry to design the processor core power supply VRM. The VRM circuit mainly comprises a PWM controller and a DrMOS power conversion chip, and in order to obtain a large VRM output current, a certain number of phases of the PWM controller are generally set, but there are the following problems: the VRM circuit generally adopts a single-phase PWM control signal to simultaneously drive a plurality of DrMOS power conversion chips, so that the balance of each phase current is difficult to ensure, and the working reliability and stability of the VRM circuit can be reduced.
Disclosure of Invention
In order to solve the technical problem, the invention provides a coupling inductance-based VRM phase number expansion circuit, which improves the VRM current output capability by expanding the phase number, and ensures the reliability and stability of the operation of the VRM circuit due to the balanced phase current.
The specific scheme of the application is as follows: a VRM phase number expansion circuit based on coupling inductance comprises a PWM controller, a phase number expansion circuit and a phase number expansion circuit, wherein the PWM controller is used for outputting a PWM control signal;
the frequency divider is internally provided with a frequency dividing circuit and is electrically connected with the PWM controller, and is used for dividing the frequency of the PWM control signal to form and output a frequency dividing control signal;
The power supply comprises N-phase sub-circuits, wherein each phase sub-circuit is provided with a power chip;
the power chip is used for receiving the frequency division control signal to realize switching on and outputting an output current i;
The output current i of the power chip in each two-phase sub-circuit flows through the same coupling inductor, and the phase difference of the frequency division control signals received by the power chips in the two-phase sub-circuit is 180 degrees.
in the technical scheme, a PWM control signal output by a PWM controller forms a plurality of frequency division control signals after passing through a frequency division circuit, each frequency division control signal controls a power chip in a phase sub-circuit to output an output current i to meet the output current intensity requirement of the whole VRM circuit, meanwhile, the output current i of the power chip in each two-phase sub-circuit flows through the same coupling inductor, and the phase difference of the frequency division control signals received by the power chips in the two-phase sub-circuit is 180 degrees, so that the staggered opening of the power chips in the two-phase sub-circuit is realized, the reverse magnetic field coupling of the output current i in the magnetic core is realized, thereby counteracting the current ripple and achieving the purposes of reducing the magnetic core loss and reducing the size and volume of the magnetic device, and the current balance between the two phases is ensured, so that the multi-phase current balance is ensured, and the working reliability and stability of the VRM circuit are ensured.
Preferably, the power chip comprises a frequency division signal receiving module and a power chip switching-on module; the frequency division signal receiving module is used for receiving a frequency division control signal; and the power chip switching-on module is used for switching on the power chip according to the frequency division control signal received by the frequency division signal receiving module and outputting an output current i.
Preferably, the sub-circuits are of even phase. Even number of phases, so that two phases form N/2 groups exactly, and the currents in all groups/all phases are balanced on the premise that the currents in each group are balanced, thereby ensuring the reliability and stability of the operation of the VRM circuit.
Preferably, the sub-circuit is 4-phase.
preferably, the power chip is a DrMOS power chip.
preferably, the frequency divider comprises a signal receiving module, a signal processing module and a signal output module;
The signal receiving module is electrically connected with the PWM controller and is used for receiving the PWM control signal output by the PWM controller;
The signal processing module is internally provided with a frequency division circuit and is used for dividing the frequency of the PWM control signal to form a frequency division control signal;
And the signal output module sends out the frequency division control signal.
the invention has the beneficial effects that: by expanding the number of phases, the current output capability of the VRM is improved, the phase current is balanced, and the working reliability and stability of the VRM circuit are ensured.
Drawings
Fig. 1 is a flowchart of a phase expansion circuit in an embodiment.
Detailed Description
The invention is described in further detail below:
example (b): as shown in figure 1, a VRM phase expansion circuit based on coupling inductance comprises
the PWM controller is used for outputting a PWM control signal;
The frequency divider is internally provided with a frequency dividing circuit and is electrically connected with the PWM controller, and is used for dividing the frequency of the PWM control signal to form and output a frequency dividing control signal;
The power supply comprises N-phase sub-circuits, wherein each phase sub-circuit is provided with a power chip; the sub-circuits are even phases, the power chips are DrMOS power chips, and in the embodiment, the sub-circuits are 4 phases;
the power chip is used for receiving the frequency division control signal to realize switching on and outputting an output current i;
The output current i of the power chip in each two-phase sub-circuit flows through the same coupling inductor, and the phase difference of the frequency division control signals received by the power chips in the two-phase sub-circuit is 180 degrees.
in the technical scheme, a PWM control signal output by a PWM controller forms a plurality of frequency division control signals after passing through a frequency division circuit, each frequency division control signal controls a power chip in a phase sub-circuit to output an output current i to meet the output current intensity requirement of the whole VRM circuit, meanwhile, the output current i of the power chip in each two-phase sub-circuit flows through the same coupling inductor, and the phase difference of the frequency division control signals received by the power chips in the two-phase sub-circuit is 180 degrees, so that the staggered opening of the power chips in the two-phase sub-circuit is realized, the reverse magnetic field coupling of the output current i in the magnetic core is realized, thereby counteracting the current ripple and achieving the purposes of reducing the magnetic core loss and reducing the size and volume of the magnetic device, and the current balance between the two phases is ensured, so that the multi-phase current balance is ensured, and the working reliability and stability of the VRM circuit are ensured.
specifically, the power chip comprises a frequency division signal receiving module and a power chip opening module; the frequency division signal receiving module is used for receiving a frequency division control signal; and the power chip switching-on module is used for switching on the power chip according to the frequency division control signal received by the frequency division signal receiving module and outputting an output current i.
The frequency divider comprises a signal receiving module, a signal processing module and a signal output module;
the signal receiving module is electrically connected with the PWM controller and is used for receiving the PWM control signal output by the PWM controller;
The signal processing module is internally provided with a frequency division circuit and is used for dividing the frequency of the PWM control signal to form a frequency division control signal;
And the signal output module sends out the frequency division control signal.
The foregoing is only a preferred embodiment of the present invention and all equivalent changes or modifications in the structure, characteristics and principles described in the present patent application are included in the scope of the present patent application.
Claims (6)
1. A VRM phase number expansion circuit based on coupling inductance is characterized by comprising a PWM controller, a phase number expansion circuit and a phase number expansion circuit, wherein the PWM controller is used for outputting a PWM control signal;
the frequency divider is internally provided with a frequency dividing circuit and is electrically connected with the PWM controller, and is used for dividing the frequency of the PWM control signal to form and output a frequency dividing control signal;
the power supply comprises N-phase sub-circuits, wherein each phase sub-circuit is provided with a power chip;
The power chip is used for receiving the frequency division control signal to realize switching on and outputting an output current i;
the output current i of the power chip in each two-phase sub-circuit flows through the same coupling inductor, and the phase difference of the frequency division control signals received by the power chips in the two-phase sub-circuit is 180 degrees.
2. the coupled inductor-based VRM phase expansion circuit of claim 1, wherein the power chip comprises a frequency division signal receiving module, a power chip turn-on module;
The frequency division signal receiving module is used for receiving a frequency division control signal;
and the power chip switching-on module is used for switching on the power chip according to the frequency division control signal received by the frequency division signal receiving module and outputting an output current i.
3. The coupled-inductor-based VRM phase expansion circuit of claim 1, wherein the subcircuits are even-numbered phases.
4. The coupled-inductor-based VRM phase expansion circuit of claim 3, wherein the subcircuit is 4-phase.
5. the coupled-inductor-based VRM phase expansion circuit of claim 1, wherein the power chip is a DrMOS power chip.
6. The coupled inductance based VRM phase expansion circuit of claim 1, wherein the frequency divider comprises a signal receiving module, a signal processing module, a signal output module;
the signal receiving module is electrically connected with the PWM controller and is used for receiving the PWM control signal output by the PWM controller;
The signal processing module is internally provided with a frequency division circuit and is used for dividing the frequency of the PWM control signal to form a frequency division control signal;
and the signal output module sends out the frequency division control signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910870857.1A CN110572015A (en) | 2019-09-16 | 2019-09-16 | VRM phase number expander circuit based on coupling inductance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910870857.1A CN110572015A (en) | 2019-09-16 | 2019-09-16 | VRM phase number expander circuit based on coupling inductance |
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| CN110572015A true CN110572015A (en) | 2019-12-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910870857.1A Pending CN110572015A (en) | 2019-09-16 | 2019-09-16 | VRM phase number expander circuit based on coupling inductance |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1169830A (en) * | 1997-08-11 | 1999-03-09 | Sanyo Denki Co Ltd | Inverter device |
| CN101345491A (en) * | 2008-05-30 | 2009-01-14 | 华硕电脑股份有限公司 | Frequency conversion multi-phase voltage regulator and its control method |
| CN101477401A (en) * | 2009-01-23 | 2009-07-08 | 华硕电脑股份有限公司 | Multi-phase voltage regulator system |
| US20160111960A1 (en) * | 2014-10-21 | 2016-04-21 | Lenovo (Singapore) Pte.Ltd. | Dividing a single phase pulse-width modulation signal into a plurality of phases |
-
2019
- 2019-09-16 CN CN201910870857.1A patent/CN110572015A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1169830A (en) * | 1997-08-11 | 1999-03-09 | Sanyo Denki Co Ltd | Inverter device |
| CN101345491A (en) * | 2008-05-30 | 2009-01-14 | 华硕电脑股份有限公司 | Frequency conversion multi-phase voltage regulator and its control method |
| CN101477401A (en) * | 2009-01-23 | 2009-07-08 | 华硕电脑股份有限公司 | Multi-phase voltage regulator system |
| US20160111960A1 (en) * | 2014-10-21 | 2016-04-21 | Lenovo (Singapore) Pte.Ltd. | Dividing a single phase pulse-width modulation signal into a plurality of phases |
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Application publication date: 20191213 |
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| RJ01 | Rejection of invention patent application after publication |