CONTROL METHOD FOR COMBINATION POWER SUPPLY OF BOOST AND BRIDGE TYPE DC-DC

• US 20190326824A1
• Filed: 04/23/2019
• Published: 10/24/2019
• Est. Priority Date: 04/24/2018
• Status: Active Grant

• Current Assignee: Shanghai TUITUO Technology Co., Ltd.
• Original Assignee: Shanghai TUITUO Technology Co., Ltd.
• Inventors: Li, Renhong, Shen, Zhuo
• Granted Patent: US 10,700,612 B2
• Time in Patent Office: Days
• CPC Class Codes: H02M 1/0009 Devices or circuits for detecting current in a converter
• CPC Class Codes: H02M 1/0058 by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero using an auxiliary actively switched resonant commutation circuit connected to an intermediate DC voltage or between two push-pull branches of an inverter bridge H02M7/4811; in resonant inverters H02M7/4815; in inverters operating from a resonant DC source H02M7/4826
• CPC Class Codes: H02M 1/0095 Hybrid converter topologies, e.g. NPC mixed with flying capacitor, thyristor converter mixed with MMC or charge pump mixed with buck
• CPC Class Codes: H02M 1/083 for the ignition at the zero crossing of the voltage or the current
• CPC Class Codes: H02M 1/4225 using a non-isolated boost converter
• CPC Class Codes: H02M 1/4258 using a single converter stage both for correction of AC input power factor and generation of a regulated and galvanically isolated DC output voltage H02M1/4241 takes precedence
• CPC Class Codes: H02M 3/01 Resonant DC/DC converters
• CPC Class Codes: H02M 3/158 including plural semiconductor devices as final control devices for a single load
• CPC Class Codes: H02M 3/33571 Half-bridge at primary side of an isolation transformer
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

A PFWM control method for a combination power supply of the boost converter and the bridge type DC-DC converter which also includes BUCK. A method of using the PFWM to control both boost and DC-DC converters simultaneously. A monitor module senses the bridge type DC-DC converter'"'"'s output voltage, current or power, to obtain the frequency of PFM for driving switching components; predetermined a duty by design and use a frequency to adjust the boost output so as to adjust the DC-DC output voltage, current or power. Another monitor module senses the input instant voltage and the boost output voltage to obtain a maximum duty which is used to prevent the boost inductor from saturation. Combine above frequency and duty into at least a pair of complement PFWM driving signals, to directly or indirectly drive the combination power supply of boost converter and bridge type DC-DC converter'"'"'s switching components.

Claims

1. A Pulse Frequency and Width Modulation (PFWM) control method for a combination power supply of a boost converter and a bridge type DC-DC converter, which also includes BUCK, the control method comprising:

sensing the DC-DC converter'"'"'s output voltage, current or power, to obtain a frequency of a Pulse Frequency Modulation (PFM) chopping signal for driving switching components according to an automatic feedback and control theory;

sensing an instant input voltage and a boost output voltage, to obtain a maximum duty to prevent a boost inductor from saturation caused by an insufficient magnetic reset;

predetermining an operating duty which is limited by the obtained maximum duty;

combining the obtained PFM frequency and the operating duty into at least a pair of complementary PFWM driving signals, directly, indirectly or after modification to drive at least a first switching component and a second switching component of the bridge type DC-DC converter, adjusting an output of the boost converter so as to control a DC-DC output.

2. The PFWM control method according to claim 1, further comprising a dead time control between complement PFWM driving signals, to drive switching components of the boost converter and the bridge type DC-DC converter.

3. The PFWM control method according to claim 2, further comprising a zero current detection of the boost inductor, upon which controls an elapse interval between the boost inductor'"'"'s current returning to zero and next on-to-off operation of the second switching component.

4. The PFWM control method according to claim 1, further comprising setting a maximum frequency of the PFWM according to a value or a range of the sensed instant input voltage.

5. The PFWM control method according to claim 1, further comprising setting a minimum frequency of the PFWM according to a value or a range of the sensed instant input voltage.

6. The PFWM control method according to claim 1, wherein several pairs of PFWM signals are obtained to drive several combination power supplies.

7. The PFWM control method according to claim 1, wherein several pairs of PFWM channels are obtained to drive several channels of combination power supplies in a manner of interleaving, phase shift, or synchronization