WO2016082717A1

WO2016082717A1 - Switching power supply and working method thereof

Info

Publication number: WO2016082717A1
Application number: PCT/CN2015/095137
Authority: WO
Inventors: 陈锋
Original assignee: 王玮冰
Priority date: 2014-11-26
Filing date: 2015-11-20
Publication date: 2016-06-02
Also published as: CN104836434A; CN104836434B

Abstract

A switching power supply and a working method thereof. The switching power supply comprises a controller (1), a voltage and current detection module (2), a voltage input port (3), a voltage output port (4), a data input port (5), a data output port (6), a switch tube SW1, a switch tube SW2, a switch tube SW4, a switch tube SW5, an inductor L, a capacitor C1, and a capacitor C2. The switch tube SW1, the switch tube SW2, the switch tube SW4, the switch tube SW5, the inductor L, the capacitor C2, the voltage and current detection module, and the controller form a conventional switching power supply part. The switch tube SW1, the switch tube SW2, the switch tube SW4, the inductor L, the capacitor C1, the voltage and current detection module, and the controller form a data sending part. The switching power supply can transmit data in a power supply interval, thereby implementing the function of a data output buffer and effectively reducing costs.

Description

Switching power supply and working method thereof

Technical field

The present invention relates to the field of power supply technologies, and in particular, to a switching power supply and a working method thereof.

Background technique

General electronic devices are equipped with a switching power supply that converts the voltage output from the DC power supply into the operating voltage of the electronic device. The switching power supply is generally powered by the DCM mode. There is an idle gap time when the DCM mode is powered. During this gap time, the switching power supply does not supply power. If the switching power supply can realize the data transmission function during the gap time, the electronic equipment can be saved. An additional data output buffer is provided to effectively reduce equipment costs.

Summary of the invention

The object of the present invention is to overcome the technical problem that the existing switching power supply cannot transmit data in the power supply gap, and provides a switching power supply capable of transmitting data during the power supply gap time, realizing the function of the data output buffer, and effectively reducing the cost.

In order to solve the above problems, the present invention is implemented by the following technical solutions:

A switching power supply of the invention comprises a controller, a voltage current detecting module, a voltage input port, a voltage output port, a data input port, a data output port, a switch tube SW1, a switch tube SW2, a switch tube SW4, a switch tube SW5, and an inductor. L, the capacitor C1 and the capacitor C2, the voltage input port is electrically connected to the first conductive end of the switch tube SW1, the second conductive end of the switch tube SW1 and the first conductive end of the switch tube SW2, the voltage current detecting module The first detecting end is electrically connected to the first conducting end of the inductor L, the second conducting end of the inductor L is opposite to the second detecting end of the voltage current detecting module, the first conducting end of the switching tube SW4, and the switching tube SW5 The first conduction end, the upper plate of the capacitor C1 and the data output port are electrically connected, and the second conduction end of the switch tube SW5 is electrically connected to the upper plate and the voltage output port of the capacitor C2, and the second conduction of the switch tube SW2 is End, switch tube SW4 The second conduction end, the lower plate of the capacitor C1 and the lower plate of the capacitor C2 are grounded, and the controller is respectively connected with the data input port, the data output end of the voltage current detecting module, the control end of the switch tube SW1, and the switch tube. The control end of the SW2, the control end of the switch tube SW4, and the control end of the switch tube SW5 are electrically connected.

After power-on, the switching power supply supplies power to the load in DCM mode. When power is supplied, the controller, the voltage and current detecting module, the power source E, the switch tube SW1, the switch tube SW2, the switch tube SW4, the switch tube SW5, the inductor L and the capacitor C2 form a DC power source, and the DC power source is in accordance with DCM under the control of the controller. Mode power supply, voltage output port output voltage to supply power to the load.

During the power supply gap time of the DCM mode, the switching power supply stops supplying power and transmits N data. During the process of the input signal Din transitioning from a low level to a high level, and then from a high level to a low level, the switching power supply operates in five stages of D1, D2, D4, D5, and D6.

When the input signal Din transitions from a low level to a high level, the D1 phase is entered, the controller controls the switch tube SW1, the switch tube SW4 is turned on, the control switch tube SW2, the switch tube SW5 is turned off, and the power source E is supplied to the inductor L and the capacitor. C1 is charged. Then enter the D2 phase, the controller controls the switch tube SW2 to be turned on, the control switch tube SW1, the switch tube SW4, and the switch tube SW5 are disconnected, and the energy on the inductor L is transferred to the capacitor C1. At the end of the D2 phase, the inductor L The current becomes 0, and the data output port of the switching power supply stably outputs the data "1".

When the input signal Din transitions from a high level to a low level, the D4 phase is entered, the controller controls the switch tube SW2 to be turned on, and the control switch tube SW1, the switch tube SW4, and the switch tube SW5 are turned off, and the energy on the capacitor C1 is transferred to In the inductor L, at the end of the D4 phase, the voltage across the capacitor C1 is zero, and the current in the inductor L reaches a maximum value. Then enter the D5 stage, the controller controls the switch tube SW1, the switch tube SW4 is turned on, the control switch tube SW2, the switch tube SW5 is disconnected, the energy in the inductor L is transferred to the power source E, and the current in the inductor L is completed at the end of the D5 phase. Becomes 0. Then enter the D6 phase, the controller controls the switch tube SW4 to be turned on, the control switch tube SW1, the switch tube SW2, the switch tube SW5 is disconnected, the voltage on the capacitor C1 is strengthened to 0, the switching power supply The data output port stabilizes the output data "0".

Preferably, the switching power supply further includes a switch tube SW3 and a switch tube SW6. The first conductive end of the switch tube SW3 is electrically connected to the voltage input port, and the second conductive end of the switch tube SW3 is connected to the inductor L. The second conduction end and the first conduction end of the switch tube SW6 are electrically connected, the second conduction end of the switch tube SW6 is electrically connected to the data output port, and the control end of the switch tube SW3 and the control end of the switch tube SW6 are respectively controlled. Electrical connection.

The voltage input port of the switching power supply is electrically connected to the positive pole of the power source E, the negative pole of the power source E is grounded, the voltage output port of the switching power supply is electrically connected to the positive pole of the load, and the negative pole of the load is grounded. The power source E is a DC power source. The switch tube SW1, the switch tube SW2, the switch tube SW4, the switch tube SW5, the inductor L, the capacitor C2, the voltage and current detection module and the controller constitute a conventional switching power supply part. The power source E, the switch tube SW1, the switch tube SW2, the switch tube SW3, the switch tube SW4, the switch tube SW6, the inductor L, the capacitor C1, the voltage current detecting module and the controller constitute a lossless data transmitting portion.

After power-on, the switching power supply supplies power to the load in DCM mode. When power is supplied, the controller controls the switch tube SW3 and the switch tube SW6 to be disconnected constantly, and the controller, the voltage and current detection module, the power source E, the switch tube SW1, the switch tube SW2, the switch tube SW4, the switch tube SW5, the inductor L and the capacitor C2 are composed. DC power supply, which is powered by DCM mode under the control of the controller, and the output voltage of the voltage output port supplies power to the load. The power supply period of the DCM mode power supply is time T. The power supply time is T1 in one power supply period, and the power supply gap time is T2, T=T1+T2. During the power supply time T1, the switching power supply works as follows:

P1 stage: the controller controls the switch tube SW1, the switch tube SW4 is turned on, the control switch tube SW2, the switch tube SW3, the switch tube SW5, the switch tube SW6 are disconnected, and the power source E charges the inductor L;

P2 phase: When the current in the inductor L reaches the maximum value, the controller controls the switch tube SW2 and the switch tube SW5 to be turned on, and the control switch tube SW1, the switch tube SW3, the switch tube SW4, and the switch tube SW6 are disconnected, and the energy in the inductor L Transfer to capacitor C2 to supply power to the load, when the inductor L When the current decreases to 0, it jumps to the P1 phase.

During the power supply gap time T2 of the DCM mode, the switching power supply stops supplying power and transmits N data, and the transmission time of each data is T3, T2 ≥ N × T3. During the process of the input signal Din transitioning from a low level to a high level and then from a high level to a low level, the switching power supply operates in six stages of D1, D2, D3, D4, D5, and D6.

When the input signal Din jumps from a low level to a high level, the D1 phase is entered, the controller controls the switch tube SW1, the switch tube SW4 is turned on, the control switch tube SW2, the switch tube SW3, the switch tube SW5, and the switch tube SW6 are disconnected. The power source E charges the inductor L. At the end of the D1 phase, the current energy in the inductor L is equal to the capacitor energy storage when the voltage on the capacitor C1 is the voltage VE of the power source E. Then enter the D2 phase, the controller controls the switch tube SW2, the switch tube SW6 is turned on, the control switch tube SW1, the switch tube SW3, the switch tube SW4, the switch tube SW5 are disconnected, and the energy on the inductor L is transferred to the capacitor C1, at D2 At the end of the phase, the current in inductor L becomes zero. Then enter the D3 phase, the controller controls the switch tube SW3 and the switch tube SW6 to be turned on, the control switch tube SW1, the switch tube SW2, the switch tube SW4, and the switch tube SW5 are disconnected, and the power source E strengthens the voltage on the capacitor C1 to the power source E. Voltage VE, the data output port of the switching power supply stabilizes the output data "1".

When the input signal Din transitions from a high level to a low level, the process proceeds to the D4 phase, and the controller controls the switch tube SW2 and the switch tube SW6 to be turned on, and the control switch tube SW1, the switch tube SW3, the switch tube SW4, and the switch tube SW5 are disconnected. The energy on capacitor C1 is transferred to inductor L. At the end of phase D4, the voltage across capacitor C1 is zero and the current in inductor L reaches a maximum. Then enter the D5 stage, the controller controls the switch tube SW1, the switch tube SW4, the switch tube SW6 to be turned on, the control switch tube SW2, the switch tube SW3, the switch tube SW5 is disconnected, the energy in the inductor L is transferred to the power source E, D5 stage At the end, the current in the inductor L becomes zero. Then enter the D6 phase, the controller controls the switch tube SW4 and the switch tube SW6 to be turned on, and the control switch tube SW1, the switch tube SW2, the switch tube SW3, and the switch tube SW5 are disconnected, and the voltage on the capacitor C1 is strengthened to 0. The data output port of the switching power supply stabilizes the output data "0".

In the working method of the switching power supply of the present invention, the voltage input port of the switching power supply is electrically connected to the positive pole of the power source E, and the negative pole of the power source E is grounded, including the following steps;

S1: The switching power supply supplies power to the load according to the DCM mode: when power is supplied, the controller controls the switch tube SW3 and the switch tube SW6 to be disconnected constantly, the controller, the voltage current detecting module, the power source E, the switch tube SW1, the switch tube SW2, and the switch tube SW4 The switch tube SW5, the inductor L and the capacitor C2 form a DC power source, and the DC power source is powered by the DCM mode under the control of the controller, and the output voltage of the voltage output port supplies power to the load;

S2: In the power supply gap time T2 of the DCM mode, the switching power supply transmits N data, and the method for transmitting data includes the following steps:

S21: The current voltage detecting module detects the current in the inductor L and the output voltage of the voltage output port, and the controller reads the input signal Din. When the input signal Din transitions from a low level to a high level, step S22 is performed, when the input signal Din When jumping from a high level to a low level, step S25 is performed;

S22: The controller controls the switch tube SW1 and the switch tube SW4 to be turned on for H time, and the control switch tube SW2, the switch tube SW3, the switch tube SW5, and the switch tube SW6 are turned off for H time, and the power source E charges the inductor L;

S23: At the end of the H time, the controller controls the switch tube SW2 and the switch tube SW6 to be turned on, and the control switch tube SW1, the switch tube SW3, the switch tube SW4, and the switch tube SW5 are disconnected, and the energy on the inductor L is transferred to the capacitor C1;

S24: When the current in the inductor L is 0, the controller controls the switch tube SW3 and the switch tube SW6 to be turned on, the control switch tube SW1, the switch tube SW2, the switch tube SW4, and the switch tube SW5 are disconnected, and the power source E is on the capacitor C1. The voltage is boosted to the voltage VE of the power source E, and then jumps to step S21;

S25: the controller controls the switch tube SW2, the switch tube SW6 is turned on, the control switch tube SW1, the switch tube SW3, the switch tube SW4, the switch tube SW5 are disconnected, and the energy on the capacitor C1 is transferred to Inductor L;

S26: When the voltage on the capacitor C1 is 0, the controller controls the switch tube SW1, the switch tube SW4, and the switch tube SW6 to be turned on, the control switch tube SW2, the switch tube SW3, and the switch tube SW5 are disconnected, and the energy transfer in the inductor L To the power source E;

S27: When the current on the inductor L is 0, the controller controls the switch tube SW4 and the switch tube SW6 to be turned on, the control switch tube SW1, the switch tube SW2, the switch tube SW3, and the switch tube SW5 are disconnected, and the voltage on the capacitor C1 is Strengthen to 0, and then jump to step S21.

Preferably, the transmission time of each data is T3, and T2 ≥ N × T3. The user can adjust the power supply gap time T2 of the DCM mode as needed to adjust the number of data sent during the power supply time.

Preferably, the H time length is: the controller modifies the H time length in real time, and includes the following steps: the controller presets the initial value of the H time, and when the step S23 ends, the current in the inductor L is 0, if the capacitor C1 is at this time If the voltage is greater than the voltage VE of the power source E, the length of the H time is decreased. If the voltage on the capacitor C1 is lower than the voltage VE of the power source E, the length of the H time is increased.

Preferably, in the step S1, the controller, the voltage current detecting module, the power source E, the switch tube SW1, the switch tube SW2, the switch tube SW4, the switch tube SW5, the inductor L and the capacitor C2 form a step-up and step-down DC of the synchronous rectified non-inverting output. - DC BUCK-BOOST topology circuit, the BUCK-BOOST topology circuit is powered by DCM mode under the control of the controller, and the voltage output port output voltage supplies power to the load.

Preferably, in the step S1, the controller further controls the switch tube SW4 to be constantly turned off, and the control switch tube SW5 is constantly turned on, the controller, the voltage current detecting module, the power source E, the switch tube SW1, the switch tube SW2, the inductor L and the capacitor C2 constitutes a BUCK topology circuit of synchronous rectification step-down DC-DC. The BUCK topology circuit is powered by DCM mode under the control of the controller, and the output voltage of the voltage output port supplies power to the load.

Preferably, in the step S1, the controller further controls the switch tube SW2 to be permanently disconnected, and the control is turned on. The switch SW1 constant conduction, the controller, the voltage and current detection module, the power supply E, the switch tube SW4, the switch tube SW5, the inductor L and the capacitor C2 form a BOOST topology circuit of the synchronous rectification step-up DC-DC, and the BOOST topology circuit is under control Under the control of the device, the power is supplied according to the DCM mode, and the output voltage of the voltage output port supplies power to the load.

Preferably, the power supply period of the DCM mode power supply is time T, and the power supply time of one power supply period is T1, T=T1+T2, and the power supply method in the power supply time T1 includes the following steps:

M1: the controller controls the switch tube SW1, the switch tube SW4 is turned on, the control switch tube SW2, the switch tube SW3, the switch tube SW5, the switch tube SW6 are disconnected, and the power source E charges the inductor L;

M2: When the current in the inductor L reaches the maximum value, the controller controls the switch tube SW2, the switch tube SW5 is turned on, the control switch tube SW1, the switch tube SW3, the switch tube SW4, the switch tube SW6 are disconnected, and the energy transfer in the inductor L The load is supplied to the capacitor C2. When the current in the inductor L decreases to zero, the T1 time ends.

Preferably, after the end of the T1 time, the power supply gap time T2 is entered, and during the power supply gap time T2, the switch tube SW5 is always turned off, and the switching power supply does not charge or discharge the capacitor C2.

The substantial effect of the invention is that the switching power supply can transmit data during the power supply gap time, realize the function of the data output buffer, and effectively reduce the cost.

DRAWINGS

Figure 1 is a circuit schematic diagram of the present invention;

2 is a timing diagram of a control signal of the present invention.

In the figure: 1, controller, 2, voltage and current detection module, 3, voltage input port, 4, voltage output port, 5, data input port, 6, data output port, 7, load.

detailed description

The technical solution of the present invention is further specific by the following embodiments and with reference to the accompanying drawings. Description.

Embodiment 1: A switching power supply of the embodiment, as shown in FIG. 1, includes a controller 1, a voltage current detecting module 2, a voltage input port 3, a voltage output port 4, a data input port 5, and a data output port 6, The switch tube SW1, the switch tube SW2, the switch tube SW4, the switch tube SW5, the inductor L, the capacitor C1 and the capacitor C2, the voltage input port 3 is electrically connected to the first conductive end of the switch tube SW1, and the second switch tube SW1 is connected. The conduction end is electrically connected to the first conduction end of the switch tube SW2, the first detection end of the voltage current detecting module 2 and the first conduction end of the inductor L, and the second conduction end of the inductor L and the voltage current detecting module 2 The second detecting end, the first conducting end of the switch tube SW4, the first conducting end of the switch tube SW5, the upper plate of the capacitor C1 and the data output port 6 are electrically connected, and the second conducting end of the switch tube SW5 is The upper plate of the capacitor C2 is electrically connected to the voltage output port 4, and the second conduction end of the switch tube SW2, the second conduction end of the switch tube SW4, the lower plate of the capacitor C1, and the lower plate of the capacitor C2 are grounded. Data output of the controller 1 and the data input port 5 and the voltage current detecting module 2, respectively The terminal, the control end of the switch SW1, the control end of the switch SW2, the control end of the switch SW4, and the control end of the switch SW5 are electrically connected.

When the input signal Din transitions from a low level to a high level, the D1 phase is entered, the controller controls the switch tube SW1, the switch tube SW4 is turned on, the control switch tube SW2, the switch tube SW5 is turned off, and the power source E is supplied to the inductor L and the capacitor. C1 is charged. Then enter the D2 phase, the controller controls the switch tube SW2 to be turned on, and the control switch tube SW1, the switch tube SW4, and the switch tube SW5 are disconnected, and the inductor L is connected. The energy is transferred to the capacitor C1. At the end of the D2 phase, the current in the inductor L becomes 0, and the data output port of the switching power supply stably outputs the data "1".

When the input signal Din transitions from a high level to a low level, the D4 phase is entered, the controller controls the switch tube SW2 to be turned on, and the control switch tube SW1, the switch tube SW4, and the switch tube SW5 are turned off, and the energy on the capacitor C1 is transferred to In the inductor L, at the end of the D4 phase, the voltage across the capacitor C1 is zero, and the current in the inductor L reaches a maximum value. Then enter the D5 stage, the controller controls the switch tube SW1, the switch tube SW4 is turned on, the control switch tube SW2, the switch tube SW5 is disconnected, the energy in the inductor L is transferred to the power source E, and the current in the inductor L is completed at the end of the D5 phase. Becomes 0. Then enter the D6 stage, the controller controls the switch tube SW4 to be turned on, the control switch tube SW1, the switch tube SW2, the switch tube SW5 is disconnected, the voltage on the capacitor C1 is boosted to 0, and the data output port of the switching power supply stabilizes the output data “0” ".

Embodiment 2: A switching power supply of the embodiment, as shown in FIG. 1, includes a controller 1, a voltage current detecting module 2, a voltage input port 3, a voltage output port 4, a data input port 5, and a data output port 6, Switch tube SW1, switch tube SW2, switch tube SW3, switch tube SW4, switch tube SW5, switch tube SW6, inductor L, capacitor C1 and capacitor C2, voltage input port 3 and first conduction end of switch tube SW1 and switch tube The first conductive end of the SW3 is electrically connected, and the second conductive end of the switch SW1 is electrically connected to the first conductive end of the switch SW2, the first detecting end of the voltage current detecting module 2, and the first conducting end of the inductor L. Connected, the second conductive end of the inductor L and the second detecting end of the voltage and current detecting module 2, the first conducting end of the switch tube SW4, the first conducting end of the switch tube SW5, and the second conducting end of the switch tube SW3 The terminal is electrically connected to the first conductive end of the switch SW6, and the second conductive end of the switch SW5 is electrically connected to the upper plate and the voltage output port of the capacitor C2, and the second conductive end of the switch SW6 is connected to the capacitor C1. The upper plate and the data output port 6 are electrically connected, and the second conductive end of the switch tube SW2 and the switch tube SW The second conduction end of 4, the lower plate of the capacitor C1 and the lower plate of the capacitor C2 are grounded, and the controller 1 is respectively connected with the data input port 5, the data output end of the voltage current detecting module 2, and the control end of the switch tube SW1. Switch tube SW2 The control end, the control end of the switch tube SW3, the control end of the switch tube SW4, the control end of the switch tube SW5, and the control end of the switch tube SW6 are electrically connected.

The voltage input port 3 of the switching power supply is electrically connected to the positive pole of the power source E, the negative pole of the power source E is grounded, the voltage output port 4 of the switching power supply is electrically connected to the positive pole of the load 7, and the negative pole of the load 7 is grounded. The power source E is a DC power source. The switch tube SW1, the switch tube SW2, the switch tube SW4, the switch tube SW5, the inductor L, the capacitor C2, the voltage/current detecting module 2, and the controller 1 constitute a conventional switching power supply portion. The power source E, the switch tube SW1, the switch tube SW2, the switch tube SW3, the switch tube SW4, the switch tube SW6, the inductor L, the capacitor C1, the voltage current detecting module 2, and the controller 1 constitute a lossless data transmitting portion.

After power-on, the switching power supply supplies power to the load in DCM mode. When power is supplied, the controller 1 controls the switch tube SW3 and the switch tube SW6 to be constantly disconnected, and the controller 1, the voltage current detecting module 2, the power source E, the switch tube SW1, the switch tube SW2, the switch tube SW4, the switch tube SW5, the inductor L and The capacitor C2 constitutes a DC power supply, which is powered by the DCM mode under the control of the controller, and the output voltage of the voltage output port 4 supplies power to the load. The power supply period of the DCM mode power supply is time T, and the power supply time is T1 in one power supply period, and the power supply gap time is T2, T=T1+T2.

A working sequence of the switching power supply is shown in Figure 2, including the following stages:

P1 stage: controller 1 controls switch tube SW1, switch tube SW4 is turned on, control switch tube SW2, switch tube SW3, switch tube SW5, switch tube SW6 is disconnected, power source E charges inductor L, when current in inductor L reaches maximum When the value is over, the P1 phase ends and enters the P2 phase. P2 stage: controller 1 controls switch tube SW2, switch tube SW5 is turned on, control switch tube SW1, switch tube SW3, switch tube SW4, and switch tube SW6 are disconnected, and energy in inductor L is transferred to capacitor C2 to supply power to the load. When the current in the inductor L decreases to 0, the P2 phase ends, enters the power supply gap time T2 of the DCM mode, and the P1 phase is re-executed after the power supply gap time T2 ends.

During the power supply gap time T2 of the DCM mode, the switching power supply stops supplying power, and the input signal Din transitions from a low level to a high level, and then transitions from a high level to a low level. In this process, Switching power supply operation is divided into six stages: D1, D2, D3, D4, D5 and D6.

When the input signal Din transitions from a low level to a high level, the process enters the D1 phase, and the controller 1 controls the switch tube SW1 and the switch tube SW4 to be turned on, and the control switch tube SW2, the switch tube SW3, the switch tube SW5, and the switch tube SW6 are disconnected. On, the power source E charges the inductor L. At the end of the D1 phase, the current energy in the inductor L is equal to the capacitor energy storage when the voltage on the capacitor C1 is the voltage VE of the power source E. Then enter the D2 phase, the controller 1 controls the switch tube SW2, the switch tube SW6 is turned on, the control switch tube SW1, the switch tube SW3, the switch tube SW4, the switch tube SW5 are disconnected, and the energy on the inductor L is transferred to the capacitor C1. At the end of the D2 phase, the current in inductor L becomes zero. Then enter the D3 stage, the controller 1 controls the switch tube SW3, the switch tube SW6 is turned on, the control switch tube SW1, the switch tube SW2, the switch tube SW4, the switch tube SW5 are disconnected, and the power source E strengthens the voltage VDout on the capacitor C1 to the power source. The voltage VE of E, the data output port 6 of the switching power supply, stabilizes the output data "1".

When the input signal Din jumps from a high level to a low level, the process proceeds to the D4 stage, and the controller 1 controls the switch tube SW2 and the switch tube SW6 to be turned on, and the control switch tube SW1, the switch tube SW3, the switch tube SW4, and the switch tube SW5 are disconnected. On, the energy on capacitor C1 is transferred to inductor L. At the end of phase D4, the voltage across capacitor C1 is zero and the current in inductor L reaches a maximum. Then enter the D5 stage, the controller 1 controls the switch tube SW1, the switch tube SW4, the switch tube SW6 to be turned on, the control switch tube SW2, the switch tube SW3, the switch tube SW5 is disconnected, the energy in the inductor L is transferred to the power source E, D5 At the end of the phase, the current in inductor L becomes zero. Then enter the D6 stage, the controller 1 controls the switch tube SW4, the switch tube SW6 is turned on, the control switch tube SW1, the switch tube SW2, the switch tube SW3, the switch tube SW5 are disconnected, the voltage on the capacitor C1 is strengthened to 0, the switching power supply The data output port 6 stabilizes the output data "0".

In the working method of the switching power supply of the embodiment, the voltage input port of the switching power supply is electrically connected to the positive pole of the power source E, and the negative pole of the power source E is grounded, including the following steps:

S1: The switching power supply supplies the load according to the DCM mode: when the power is supplied, the controller controls the switch. The tube SW3 and the switch tube SW6 are constantly disconnected, and the controller, the voltage and current detecting module, the power source E, the switch tube SW1, the switch tube SW2, the switch tube SW4, the switch tube SW5, the inductor L and the capacitor C2 form a DC power source, and the DC power source is Under the control of the controller, the power is supplied according to the DCM mode, and the output voltage of the voltage output port supplies power to the load;

S2: In the power supply gap time T2 of the DCM mode, the switching power supply stops supplying power and sends N data, and the method for transmitting data includes the following steps:

S24: When the current in the inductor L is 0, the controller controls the switch tube SW3 and the switch tube SW6 to be turned on, the control switch tube SW1, the switch tube SW2, the switch tube SW4, and the switch tube SW5 are disconnected, and the power source E is on the capacitor C1. The voltage VDout is boosted to the voltage VE of the power source E, and then jumps to step S21;

S25: the controller controls the switch tube SW2, the switch tube SW6 is turned on, the control switch tube SW1, the switch tube SW3, the switch tube SW4, the switch tube SW5 are disconnected, and the energy on the capacitor C1 is transferred to the inductor L;

The length of the H time is: the controller modifies the H time length in real time, and includes the following steps: the controller presets the initial value of the H time. When the step S23 ends, the current in the inductor L is 0. If the voltage on the capacitor C1 is greater than the power source at this time The voltage VE of E decreases the length of time H. If the voltage on the capacitor C1 is lower than the voltage VE of the power source E, the length of time H is increased.

The transmission time of each data is T3, T2 ≥ N × T3. The user can adjust the power supply gap time T2 of the DCM mode as needed to adjust the number of data sent during the power supply time.

In step S1, the controller, the voltage and current detecting module, the power source E, the switch tube SW1, the switch tube SW2, the switch tube SW4, the switch tube SW5, the inductor L and the capacitor C2 form a BUCK- of the step-down DC-DC of the synchronous rectification non-inverting output. BOOST topology circuit, the BUCK-BOOST topology circuit is powered by the DCM mode under the control of the controller, and the output voltage of the voltage output port supplies power to the load.

In step S1, the controller can also control the switch tube SW4 to be constantly turned off, and the control switch tube SW5 is constantly turned on. At this time, the controller, the voltage current detecting module, the power source E, the switch tube SW1, the switch tube SW2, the inductor L and the capacitor C2 The BUCK topology circuit constituting the synchronous rectification step-down DC-DC, the BUCK topology circuit is powered by the DCM mode under the control of the controller, and the output voltage of the voltage output port supplies power to the load.

In step S1, the controller can also control the switch tube SW2 to be constantly turned off, and the control switch tube SW1 is constantly turned on. At this time, the controller, the voltage current detecting module, the power source E, the switch tube SW4, the switch tube SW5, the inductor L and the capacitor C2 The BOOST topology circuit constituting the synchronous rectification step-up DC-DC, the BOOST topology circuit is powered by the DCM mode under the control of the controller, and the output voltage of the voltage output port supplies power to the load.

The power supply period of the DCM mode power supply is time T, and the power supply time of one power supply period is T1. T=T1+T2, the power supply method in the power supply time T1 includes the following steps:

After the end of the T1 time, the power supply gap time T2 is entered. During the power supply gap time T2, the switch tube SW5 is always turned off, and the switching power supply does not charge or discharge the capacitor C2.

Claims

A switching power supply, comprising: a controller (1), a voltage current detecting module (2), a voltage input port (3), a voltage output port (4), a data input port (5), and a data output port (6) ), the switch tube SW1, the switch tube SW2, the switch tube SW4, the switch tube SW5, the inductor L, the capacitor C1 and the capacitor C2, the voltage input port (3) is electrically connected to the first conductive end of the switch tube SW1, the switch tube The second conduction end of the SW1 is electrically connected to the first conduction end of the switch tube SW2, the first detection end of the voltage current detecting module (2), and the first conductive end of the inductor L, and the second conductive end of the inductor L The second detecting end of the voltage and current detecting module (2), the first conducting end of the switch tube SW4, the first conducting end of the switch tube SW5, the upper plate of the capacitor C1, and the data output port (6) are electrically connected. The second conduction end of the switch tube SW5 is electrically connected to the upper plate of the capacitor C2 and the voltage output port (4), the second conduction end of the switch tube SW2, the second conduction end of the switch tube SW4, and the capacitor C1. The lower plate of the plate and the capacitor C2 are grounded, and the controller (1) respectively inputs data with the data input port (5) and the voltage current detecting module (2). A control terminal end, of the switch SW1, the switch SW2, the control terminal, the switch control terminal and the control terminal of the switch SW4 SW5 is connected.
The switching power supply according to claim 1, further comprising a switch tube SW3 and a switch tube SW6, wherein the first conductive end of the switch tube SW3 is electrically connected to the voltage input port (3), and the switch tube SW3 is The second conduction end is electrically connected to the second conduction end of the inductor L and the first conduction end of the switch tube SW6, and the second conduction end of the switch tube SW6 is electrically connected to the data output port (6), and the control of the switch tube SW3 The terminal and the control terminal of the switch SW6 are electrically connected to the controller (1), respectively.
A switching power supply working method is applicable to the switching power supply of claim 2, wherein the voltage input port of the switching power supply is electrically connected to the positive pole of the power source E, and the negative pole of the power source E is grounded, and the method comprises the following steps:

S1: The switching power supply supplies power to the load according to the DCM mode: when power is supplied, the controller controls the switching tube SW3 and the switch tube SW6 are constantly disconnected, and the controller, the voltage and current detection module, the power source E, the switch tube SW1, the switch tube SW2, the switch tube SW4, the switch tube SW5, the inductor L and the capacitor C2 form a DC power source, and the DC power source is under control. Under the control of the device, the power is supplied according to the DCM mode, and the output voltage of the voltage output port supplies power to the load;

S2: In the power supply gap time T2 of the DCM mode, the switching power supply transmits N data, and the method for transmitting data includes the following steps:

S21: The current voltage detecting module detects the current in the inductor L and the output voltage of the voltage output port, and the controller reads the input signal Din. When the input signal Din transitions from a low level to a high level, step S22 is performed, when the input signal Din When jumping from a high level to a low level, step S25 is performed;

S22: The controller controls the switch tube SW1 and the switch tube SW4 to be turned on for H time, and the control switch tube SW2, the switch tube SW3, the switch tube SW5, and the switch tube SW6 are turned off for H time, and the power source E charges the inductor L;

S23: At the end of the H time, the controller controls the switch tube SW2 and the switch tube SW6 to be turned on, and the control switch tube SW1, the switch tube SW3, the switch tube SW4, and the switch tube SW5 are disconnected, and the energy on the inductor L is transferred to the capacitor C1;

S24: When the current in the inductor L is 0, the controller controls the switch tube SW3 and the switch tube SW6 to be turned on, the control switch tube SW1, the switch tube SW2, the switch tube SW4, and the switch tube SW5 are disconnected, and the power source E is on the capacitor C1. The voltage is boosted to the voltage VE of the power source E, and then jumps to step S21;

S25: the controller controls the switch tube SW2, the switch tube SW6 is turned on, the control switch tube SW1, the switch tube SW3, the switch tube SW4, the switch tube SW5 are disconnected, and the energy on the capacitor C1 is transferred to the inductor L;

S26: When the voltage on the capacitor C1 is 0, the controller controls the switch tube SW1, the switch tube SW4, and the switch tube SW6 to be turned on, the control switch tube SW2, the switch tube SW3, and the switch tube SW5 are disconnected, and the energy transfer in the inductor L To the power source E;

S27: When the current on the inductor L is 0, the controller controls the switch tube SW4 and the switch tube SW6. When it is turned on, the control switch SW1, the switch SW2, the switch SW3, and the switch SW5 are turned off, the voltage on the capacitor C1 is boosted to 0, and then the process proceeds to step S21.
The operating method of a switching power supply according to claim 3, characterized in that the transmission time of each data is T3, T2 ≥ N × T3.
The working method of the switching power supply according to claim 3, wherein the H time length is: the controller modifies the H time length in real time, and includes the following steps: the controller presets an initial value of the H time, when the step S23 ends, The current in the inductor L is 0. If the voltage on the capacitor C1 is greater than the voltage VE of the power source E, the length of the H time is decreased. If the voltage on the capacitor C1 is lower than the voltage VE of the power source E, the length of the H time is increased. .
The working method of the switching power supply according to claim 3 or 4 or 5, characterized in that: in the step S1, the controller, the voltage current detecting module, the power source E, the switch tube SW1, the switch tube SW2, the switch tube SW4, the switch The tube SW5, the inductor L and the capacitor C2 form a BUCK-BOOST topology circuit of the synchronously rectified non-inverting output DC-DC. The BUCK-BOOST topology circuit is powered by the DCM mode under the control of the controller, and the voltage output port output voltage is given to Load power supply.
The working method of the switching power supply according to claim 3 or 4 or 5, wherein in the step S1, the controller further controls the switching tube SW4 to be constantly turned off, and the control switch tube SW5 is constantly turned on, the controller, the voltage and current. The detection module, the power supply E, the switch tube SW1, the switch tube SW2, the inductor L and the capacitor C2 form a BUCK topology circuit of the synchronous rectification step-down DC-DC, and the BUCK topology circuit is powered by the DCM mode under the control of the controller, and the voltage output port The output voltage supplies power to the load.
The working method of the switching power supply according to claim 3 or 4 or 5, wherein in the step S1, the controller further controls the switching tube SW2 to be constantly turned off, and the control switch tube SW1 is constantly turned on, the controller, the voltage and current. The detection module, the power supply E, the switch tube SW4, the switch tube SW5, the inductor L and the capacitor C2 form a BOOST topology circuit of the synchronous rectification step-up DC-DC, the BOOST The topology circuit is powered by the DCM mode under the control of the controller, and the output voltage of the voltage output port supplies power to the load.
The working method of the switching power supply according to claim 3, wherein the power supply period of the DCM mode power supply is time T, and the power supply time of one power supply period is T1, T=T1+T2, and the power supply method in the power supply time T1 includes The following steps:

M1: the controller controls the switch tube SW1, the switch tube SW4 is turned on, the control switch tube SW2, the switch tube SW3, the switch tube SW5, the switch tube SW6 are disconnected, and the power source E charges the inductor L;

M2: When the current in the inductor L reaches the maximum value, the controller controls the switch tube SW2, the switch tube SW5 is turned on, the control switch tube SW1, the switch tube SW3, the switch tube SW4, the switch tube SW6 are disconnected, and the energy transfer in the inductor L The load is supplied to the capacitor C2. When the current in the inductor L decreases to zero, the T1 time ends.
The working method of the switching power supply according to claim 9, wherein the T1 time is completed and the power supply gap time T2 is entered. During the power supply gap time T2, the switch tube SW5 is always turned off, and the switching power supply does not charge or discharge the capacitor C2. .