Synchronous phase locking method for power supply and power supply
A technology of genlock and power supply, which is applied in the field of communication, can solve problems such as low precision, slow phase lock speed, and no solution proposed, and achieve the effect of improving phase lock speed and accuracy
Active Publication Date: 2012-11-28
ZTE CORP
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[0006] However, the first two methods have the same disadvantage: the condition for the slave to obtain the frequency and phase of the master is to first obtain the output voltage of the master, but in some applications (for example, modular uninterruptible power supply (Uninterruptible PowerSupply, referred to as For UPS)), this condition may not be satisfied; although the third method does not need to obtain the output voltage of the master, but because the master only sends out pulse signals at the zero crossing point, the slave can only obtain the frequency of the master once in a cycle Phase information, so the speed of phase locking is slow and the accuracy is low
[0007] For the problems existing in related technologies, no effective solutions have been proposed yet
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[0034] Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.
[0035] The inverter power supply system is taken as an example for illustration below. In the inverter power supply system, there are currently two types of systems that need to perform frequency and phase tracking: in the UPS system and the inverter system, the following embodiments can be applied to these two systems, but It is not limited to this.
[0036] In the following embodiments, among the inverter power supplies that need to be connected in parallel, one master is set, and the others are set as slaves. The host sends out a pulse width modulation (PulseWidth Modulation, PWM for short) signal with its own frequency and phase according to the frequency and phase of its own inverter output vol...
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The invention discloses a synchronous phase locking method for a power supply and the power supply. The power supply comprises a host and a slave, which are connected in parallel. The method comprises the following steps that: the host transmits a pulse width modulation (PWM) signal with own phase and frequency, wherein fPWM=m.fINV, fPWM is the frequency of the PWM signal, fINV is the frequency of the output voltage of the host, m is an integer, and each output voltage period of the host comprises m PWM periods, namely PWM0, PWM1, ..., PWMm-1 respectively; and the slave acquires the PWM signal, and obtains the frequency and phase of the host according to the frequency and phase of the PWM signal.
Description
technical field [0001] The present invention relates to the communication field, in particular to a method for synchronously locking a power supply and the power supply. Background technique [0002] At present, in the inverter power supply system using digital control technology, there are three commonly used methods for synchronous phase-locking of the power supply as follows: [0003] Method 1: Set up a master, and after the slave rectifies the output voltage of the master, use the capture function of the control chip to obtain the frequency and phase of the master, so as to lock the phase; [0004] Method 2: Set a master, the slave samples the output voltage of the master, and then obtains the frequency and phase of the master through an algorithm; [0005] Method 3: Set a master, and the master sends a pulse signal at the zero-crossing point of the inverter voltage, which is the same as its own inverter frequency, and the slave obtains the frequency and zero-crossing t...
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Login to View More IPC IPC(8): H03K5/13H03K5/153
CPCH03K5/13H02M7/493H02M2001/0003H02J9/06H03K5/153H02J3/40H02M1/0003
Inventor 陈景熙
Owner ZTE CORP