WO2016050155A1

WO2016050155A1 - Power supply management apparatus and energy recovery method therefor

Info

Publication number: WO2016050155A1
Application number: PCT/CN2015/090299
Authority: WO
Inventors: 陈锋
Original assignee: 王玮冰
Priority date: 2014-09-30
Filing date: 2015-09-22
Publication date: 2016-04-07
Also published as: CN105896963B; CN105896963A

Abstract

Disclosed are a power supply management apparatus and an energy recovery method therefor. The apparatus comprises a controller (1), a current detection module (2), a voltage detection module (3), a power supply (E1), an inductor (L1), a capacitor (C1), a first switch tube (S1) and a second switch tube (S2), wherein a positive electrode of the power supply (E1) is electrically connected to one end of the first switch tube (S1); the other end of the first switch tube (S1) is electrically connected to one end of the second switch tube (S2), one end of the inductor (L1) and the current detection module (2); the other end of the inductor (L1) is electrically connected to the voltage detection module (3), one end of the capacitor (C1) and a positive electrode of a load (4); a negative electrode of the power supply (E1), the other end of the second switch tube (S2), the other end of the capacitor (C1) and a negative electrode of the load (4) are all grounded; and the controller (1) is electrically connected to the first switch tube (S1), the second switch tube (S2), the current detection module (2), the voltage detection module (3) and the load (4), respectively. In the present invention, after being subjected to DC-DC conversion, a power supply can supply power to a load, and an electric quantity stored on a capacitor can be recovered in the case of not supplying the power, thereby preventing electric leakage and saving energy.

Description

Power management device and energy recovery method thereof

Technical field

The present invention relates to the field of power supply technologies, and in particular, to a power management device and an energy recovery method thereof.

Background technique

In some low-power applications, electronic devices operate at low frequencies. In the standby process, there is leakage, and in some cases, the energy lost is comparable to the corresponding normal working energy. This requires the power module to stop supplying power to the load, but the power stored in the power module's decoupling capacitor, output parasitic capacitance, or internal parasitic capacitance of the circuit can also leak. For example, the buck circuit and the boost circuit can convert the power supply to the load by DC-DC conversion, but when the power supply is stopped, the capacitance is stored in the capacitor, and leakage may occur. In order to further save energy, it is necessary to design a power management device that can recover the energy on the capacitor of the power module to the power supply terminal.

Chinese Patent Publication No. CN103337956, published on October 2, 2013, entitled "Bidirectional Buck Converter", which discloses a bidirectional Buck converter comprising a forward Buck converter and a negative Buck converter; The forward Buck converter and the negative Buck converter are connected in reverse; the forward Buck converter and the negative Buck converter share the same inductance L. The disadvantage is that when the bidirectional Buck converter is not working, the power on the capacitor cannot be recovered to the power supply end, and leakage may occur and energy is wasted.

Summary of the invention

The object of the present invention is to overcome the technical problem that the existing power management device can not recover the power stored on the capacitor when no power is supplied, and leakage may occur, and provide a power management device and an energy recovery method thereof, which can DC the power supply. - DC power is supplied to the load after conversion, and the power stored in the capacitor can be recovered when power is not supplied to prevent leakage and save energy.

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

A power management device of the present invention includes a first controller, a first current detecting module, a first voltage detecting module, a power source E1, an inductor L1, a capacitor C1, a switch tube S1, and a switch tube S2, and the anode of the power source E1 The first conductive end of the switch S1 is electrically connected to the first conductive end of the switch S1, the first conductive end of the switch S2, the first conductive end of the inductor L1, and the detecting end of the first current detecting module. Electrically connected, the second conducting end of the inductor L1 is electrically connected to the detecting end of the first voltage detecting module, the end of the capacitor C1 and the positive pole of the load, the negative pole of the power source E1, the second conducting end of the switching tube S2, and the capacitor C1 One end and the negative pole of the load are grounded, and the first controller is respectively connected with the control end of the switch S1, the control end of the switch S2, the data output end of the first current detecting module, the data output end of the first voltage detecting module, and the load. The control terminal is electrically connected.

In the technical solution, when the power management device supplies power to the load, the first controller, the power source E1, the inductor L1, the capacitor C1, the switch tube S1, and the switch tube S2 form a topology circuit of the synchronous rectification BUCK step-down DC-DC. The first controller controls the switch tube S1 and the switch tube S2 to be non-overlapping to realize the function of the conventional synchronous rectification BUCK step-down DC-DC topology circuit, and the first controller adjusts the duty ratio of the output control signal, thereby The voltage VDD1 that controls the output to the load is stabilized at a certain set value.

When the load is not working, the first controller controls the load to be powered off, the power management device stops supplying power to the load, and performs energy recovery work. Energy recovery work includes the T1 phase and the T2 phase.

In the T1 phase, the first controller controls the switch S2 to be turned on, the control switch S1 is turned off, the capacitor C1 forms a path to the ground via the inductor L1 and the switch S2, and the capacitor C1 charges the inductor L1. During the charging process, the capacitor C1 The upper voltage VDD1 drops, the energy portion of the capacitor C1 is transferred to the inductor L1, and the first current detecting module detects the current in the inductor L1. When the current value detected by the first current detecting module is greater than or equal to the preset value Ip1, the first controller controls the switch tube S2 to be disconnected, and the T1 phase ends, and enters the T2 phase;

T2 stage: after the switch tube S2 is disconnected, the first controller controls the switch tube S1 to be turned on, and the capacitor C1 The inductor L1 and the switch S1 form a path to the power source E1, the inductor L1 and the capacitor C1 charge the power source E1, the current in the inductor L1 decreases, and the first current detecting module detects the current in the inductor L1, when the first current detecting module detects When the current value is equal to 0, the T2 phase ends and the T1 phase is re-entered. In the T2 phase, the voltage on capacitor C1 also decreases, and the energy on capacitor C1 is also partially transferred to power supply E1.

The T1 phase and the T2 phase are cyclically executed until the first voltage detecting module detects that the voltage on the capacitor C1 drops to 0 and the first current detecting module detects that the current in the inductor L1 is also 0, at which time the first controller controls the switch. Both the tube S1 and the switch S2 are disconnected and the entire energy recovery process is completed.

Preferably, the power management device further includes a switch tube S3 and a switch tube S4, the first conductive end of the switch tube S3 and the first conductive end of the switch tube S4 and the second conductive end of the inductor L1. Electrical connection, the second conduction end of the switch tube S3 is electrically connected to the positive pole of the load, the second conductive end of the switch tube S4 is grounded, and the control end of the switch tube S3 and the control end of the switch tube S4 are respectively electrically connected to the first controller .

When the power management device supplies power to the load boost, the first controller controls the switch tube S1 to be constantly turned on, and the control switch tube S2 is constantly turned off. At this time, the first controller, the power source E1, the inductor L1, the capacitor C1, and the switch tube S3 And the switch tube S4 constitutes a synchronous rectification BOOST step-up DC-DC topology circuit. The first controller controls the switch tube S3 and the switch tube S4 to be non-overlapping to realize the function of the conventional synchronous rectification BOOST step-up DC-DC topology circuit, and the first controller adjusts the duty ratio of the output control signal, thereby The voltage VDD1 that controls the output to the load is stabilized at a certain set value.

When the load is not working, the first controller controls the load to be powered off, the power management device stops supplying power to the load, and performs energy recovery work. When the energy recovery operation is performed, the first controller first controls the switch tube S3 to be constantly turned on, the control switch tube S4 is constantly turned off, and then performs the T1 phase and the T2 phase cyclically until the first voltage detecting module detects the voltage drop on the capacitor C1. Go to 0 and the first current detecting module detects that the current in the inductor L1 is also 0, at which time the first controller controls the switch S1 and The switch S2 is disconnected and the entire energy recovery process ends.

An energy recovery method for a power management device of the present invention includes the following steps:

When the load is not working, the power management device ends the power supply, the first controller determines whether energy recovery work is required, and if necessary, performs energy recovery work, and if not, does not perform energy recovery work, the energy recovery work includes The following steps:

N1: the first controller controls the switch tube S2 to be turned on, the control switch tube S1 is turned off, the capacitor C1 charges the inductor L1, and the first current detecting module detects the current in the inductor L1;

N2: When the current value detected by the first current detecting module is greater than or equal to the preset value Ip1, the first controller controls the switch tube S2 to be turned off, the control switch tube S1 is turned on, and the inductor L1 and the capacitor C1 charge the power source E1, first The current detecting module detects the current in the inductor L1;

N3: When the current value detected by the first current detecting module is equal to 0, the first voltage detecting module detects the voltage on the capacitor C1. If the voltage value is greater than 0, the process jumps to step N1. Otherwise, the first controller controls the switch tube. Both S1 and switch S2 are disconnected and energy recovery ends.

The power management device can be set to perform energy recovery work after each power supply is completed, and the power management device can be set to perform energy recovery work after several power supply intervals.

Preferably, the method for the first controller to determine whether energy recovery work is required comprises the following steps:

H1: At the end of the first power supply, the first controller determines that energy recovery work is not required;

H2: the first controller detects the voltage on the capacitor C1 through the first voltage detecting module, and monitors the voltage drop on the capacitor C1 before the current power supply ends until the next power supply starts;

H3: If the voltage drop on the capacitor C1 is greater than the set value Vdrop1 before the current power supply is completed, it is judged that the energy recovery operation is required after the next n power supply ends, and the n+1th power supply ends to the first No energy recovery is required before n+2 power supply starts. Step H2 is re-executed at the end of the n+1th power supply. If the current power supply ends until the next power supply starts, the voltage drop across the capacitor C1 is less than or equal to the set value Vdrop1. , judge the end of the next power supply No energy recovery is required, and step H2 is re-executed at the end of the next power supply.

Preferably, the voltage drop setting value Vdrop1=(Q1+Q2)/C1, Q1 is the energy of the energy recovery of the capacitor C1 during the energy recovery process to the power source E1, and Q2 is the power source E1 to the capacitor during the power supply process. The energy lost when C1 is charged to the set value, and C1 is the capacity of the capacitor C1.

A power management device of the present invention includes a second controller, a second current detecting module, a second voltage detecting module, a power source E2, an inductor L2, a capacitor C2, a switch tube S5, and a switch tube S6, and the anode of the power source E2 The first conduction end of the switch tube S5 and the first detection end of the second current detecting module are electrically connected, and the second conductive end of the switch tube S5 is connected to the first conductive end of the inductor L2 and the second current detecting module. The second detecting end is electrically connected to the first conducting end of the switch tube S6, the second conducting end of the switch tube S6 is grounded to one end of the capacitor C2 and the load end, and the other end of the capacitor C2 is connected to the other end of the load and the second lead of the inductor L2. The terminal is electrically connected to the negative pole of the power source E2, and the second controller is respectively connected to the control end of the switch tube S5, the control end of the switch tube S6, the data output end of the second current detecting module, and the data output of the second voltage detecting module. The terminal is electrically connected to the control terminal of the load.

In the technical solution, when the power management device supplies power to the load, the second controller, the power source E2, the inductor L2, the capacitor C2, the switch tube S5 and the switch tube S6 form a reverse output synchronous rectification BUCK-BOOST buck-boost DC- DC topology circuit. The second controller controls the switch tube S5 and the switch tube S6 to be non-overlapping to realize the function of the conventional reverse output synchronous rectification BUCK-BOOST buck-boost DC-DC topology circuit.

When the load is not working, the second controller controls the load to be powered off, the power management device stops supplying power to the load, and performs energy recovery work. Energy recovery work includes the T3 phase and the T4 phase.

T3 stage: the second controller controls the switch tube S6 to be turned on, the control switch tube S5 is turned off, the capacitor C2 forms a path to the ground via the inductor L2 and the switch tube S6, and the capacitor C2 charges the inductor L2. During the charging process, the capacitor C2 The upper voltage VDD2 drops, the energy portion of the capacitor C2 is transferred to the inductor L2, and the second current detecting module detects the current in the inductor L2. When the current value detected by the second current detecting module is greater than or equal to the preset value Ip2, the second controller controls the switch tube S6 to be disconnected, T3 At the end of the phase, enter the T4 phase;

T4 stage: after the switch tube S6 is disconnected, the second controller controls the switch tube S5 to be turned on, the inductor L2 and the switch tube S5 form a path to the power source E2, the inductor L2 charges the power source E2, and the current in the inductor L2 decreases, the second The current detecting module detects the current in the inductor L2. When the current value detected by the second current detecting module is equal to 0, the T4 phase ends and the T3 phase is re-entered.

The T3 phase and the T4 phase are cyclically executed until the second voltage detecting module detects that the voltage on the capacitor C2 drops to 0 and the second current detecting module detects that the current in the inductor L2 is also 0, at which time the second controller controls the switch. Both the tube S5 and the switch tube S6 are disconnected, and the entire energy recovery process ends.

When the load is not working, the power management device ends the power supply, and the second controller determines whether energy recovery work is required, and if necessary, performs energy recovery work, and if not, does not perform energy recovery work, the energy recovery work includes The following steps:

M1: the second controller controls the switch tube S6 to be turned on, the control switch tube S5 is turned off, the capacitor C2 charges the inductor L2, and the second current detecting module detects the current in the inductor L2;

M2: When the current value detected by the second current detecting module is greater than or equal to the preset value Ip2, the second controller controls the switch tube S6 to be disconnected, the control switch tube S5 is turned on, the inductor L2 charges the power source E2, and the second current detecting module Detecting the current in the inductor L2;

M3: when the current value detected by the second current detecting module is equal to 0, the second voltage detecting module detects the voltage on the capacitor C2. If the voltage value is greater than 0, the process jumps to step M1. Otherwise, the second controller controls the switch tube. Both S5 and switch S6 are disconnected and energy recovery ends.

Preferably, the method for determining, by the second controller, whether energy recovery work is required comprises the following steps:

F1: The first power supply ends, and the second controller determines that energy recovery work is not required;

F2: the second controller detects the voltage on the capacitor C2 through the second voltage detecting module, and monitors the voltage drop on the capacitor C2 before the current power supply ends until the next power supply starts;

F3: If the voltage drop on the capacitor C2 is greater than the set value Vdrop2 before the current power supply is completed, it is judged that the energy recovery operation is required after the next k times of power supply, and the k+1th power supply ends to the first The energy recovery operation is not required before the k+2 power supply starts, and the step H2 is re-executed at the end of the k+1th power supply. If the current power supply ends until the next power supply starts, the voltage drop across the capacitor C2 is less than or equal to the set value Vdrop2. Then, it is judged that the energy recovery operation is not required at the end of the next power supply, and step F2 is re-executed at the end of the next power supply.

Preferably, the voltage drop setting value Vdrop2=(Q3+Q4)/C2, Q3 is the energy of the energy recovery of the capacitor C2 during the energy recovery process to the power source E2, and Q4 is the power source E2 to the capacitor during the power supply process. The energy lost when C2 is charged to the set value, and C2 is the capacity of the capacitor C2.

The substantial effects of the present invention are as follows: (1) The power supply can be DC-DC-converted to supply power to the load, and the power stored in the capacitor can be recovered when power is not supplied, thereby preventing leakage and saving energy. (2) Compared with the traditional buck circuit and boost circuit, there is no additional large-capacity energy storage component, which is low in cost, small in size, and high in efficiency.

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;

Figure 3 is a circuit schematic diagram of the present invention;

Figure 4 is a circuit schematic diagram of the present invention;

Figure 5 is a timing diagram of a control signal of the present invention.

In the figure: 1, the first controller, 2, the first current detection module, 3, the first voltage detection module, 4, the load, 5, the second controller, 6, the second current detection module, 7, the second voltage Detection module.

detailed description

The technical solutions of the present invention will be further specifically described below by way of embodiments and with reference to the accompanying drawings.

Embodiment 1 A power management device of the present embodiment, as shown in FIG. 1, includes a first controller 1, a first current detecting module 2, a first voltage detecting module 3, a power source E1, an inductor L1, and a capacitor C1. The switch tube S1 and the switch tube S2, the anode of the power source E1 is electrically connected to the first conduction end of the switch tube S1, the second conduction end of the switch tube S1 and the first conduction end of the switch tube S2, and the first end of the inductor L1 The conducting end is electrically connected to the detecting end of the first current detecting module 2, and the second conducting end of the inductor L1 is electrically connected to the detecting end of the first voltage detecting module 3, the end of the capacitor C1 and the positive pole of the load 4, and the negative pole of the power source E1, The second conduction end of the switch tube S2, the other end of the capacitor C1 and the negative pole of the load 4 are grounded, and the data of the first controller 1 and the control end of the switch tube S1, the control end of the switch tube S2, and the first current detection module 2, respectively The output end, the data output end of the first voltage detecting module 3 and the control end of the load 4 are electrically connected.

When the power management device supplies power to the load 4, the first controller 1, the power source E1, the inductor L1, the capacitor C1, the switch tube S1, and the switch tube S2 form a topology circuit of the synchronous rectification BUCK step-down DC-DC. The first controller 1 controls the switch tube S1 and the switch tube S2 to be non-overlapping to realize the function of the conventional synchronous rectification BUCK step-down DC-DC topology circuit, and the first controller 1 adjusts the duty ratio of the output control signal. Therefore, the voltage VDD1 output to the load 4 is controlled to be stabilized at a certain set value.

When the load 4 is not working, the first controller 1 controls the load 4 to be powered off, and the power management device stops supplying power to the load 4 and performs energy recovery work. The energy recovery work includes the T1 phase and the T2 phase, as shown in Figure 2.

In the T1 phase, the first controller 1 controls the switch S2 to be turned on, the control switch S1 is turned off, the capacitor C1 forms a path to the ground via the inductor L1 and the switch S2, and the capacitor C1 charges the inductor L1. During this charging process, the voltage VDD1 on the capacitor C1 drops, the energy portion of the capacitor C1 is transferred to the inductor L1, and the first current detecting module 2 detects the current in the inductor L1. When the current value detected by the first current detecting module 2 is greater than or equal to the preset value Ip1, the first controller 1 controls the switch tube S2 to be disconnected, and the T1 phase ends, and enters the T2 phase;

T2 stage: After the switch tube S2 is disconnected, the first controller 1 controls the switch tube S1 to be turned on, the capacitor C1 forms a path to the power source E1 via the inductor L1 and the switch tube S1, and the inductor L1 and the capacitor C1 charge the power source E1, and the inductor L1 is charged. The current is reduced, the first current detecting module 2 detects the current in the inductor L1, and when the current value detected by the first current detecting module 2 is equal to 0, the T2 phase ends and re-enters the T1 phase. In the T2 phase, the voltage on capacitor C1 also decreases, and the energy on capacitor C1 is also partially transferred to power supply E1.

The T1 phase and the T2 phase are cyclically executed until the first voltage detecting module 3 detects that the voltage on the capacitor C1 drops to 0 and the first current detecting module detects that the current in the inductor L1 is also 0, at which time the first controller 1 Both the control switch S1 and the switch S2 are disconnected, and the entire energy recovery process ends.

The energy recovery method of the power management device of the embodiment is applicable to the power management device described above, and includes the following steps:

N3: when the current value detected by the first current detecting module is equal to 0, the first voltage detecting module The voltage on the capacitor C1 is detected. If the voltage value is greater than 0, the process goes to step N1. Otherwise, the first controller controls the switch S1 and the switch S2 to be disconnected, and energy recovery ends.

The method for the first controller to determine whether energy recovery work is required includes the following steps:

H3: If the voltage drop on the capacitor C1 is greater than the set value Vdrop1 before the current power supply is completed, it is judged that the energy recovery operation is required after the next n power supply ends, and the n+1th power supply ends to the first No energy recovery is required before n+2 power supply starts. Step H2 is re-executed at the end of the n+1th power supply. If the current power supply ends until the next power supply starts, the voltage drop across the capacitor C1 is less than or equal to the set value Vdrop1. Then, it is judged that the energy recovery operation is not required at the end of the next power supply, and step H2 is re-executed at the end of the next power supply.

When the power management device supplies power to the load for the first time, the first controller monitors the voltage drop on the capacitor C1 from the end of the first power supply to the start of the second power supply through the first voltage detecting module, if the voltage drop is greater than the set value Vdrop1 Then, after the next n power supply ends, the energy recovery work needs to be performed, and at the end of the n+1th power supply, the voltage drop on the capacitor C1 between the adjacent two power supplies is restarted, and the power management device does not perform the monitoring. Energy recovery work; if the pressure drop is less than or equal to the set value Vdrop1, no energy recovery is required at the end of the next power supply, and the monitoring of the voltage drop across the capacitor C1 between adjacent power supplies continues until two adjacent times. When the voltage drop across the capacitor C1 is greater than the set value Vdrop1, the energy recovery operation is required after the next n power supply ends, and the capacitance between the adjacent two power supplies is restarted at the end of the n+1th power supply. The pressure drop across C1.

The voltage drop setting value Vdrop1=(Q1+Q2)/C1, Q1 is the energy of the energy loss recovered from the capacitor C1 during the energy recovery process to the power source E1, and Q2 is the power source E1 charging the capacitor C1 to the setting during the power supply process. The energy lost in the value, C1 is the capacity of the capacitor C1. If the previous time The energy corresponding to the voltage drop across the capacitor C1 before the start of the next power supply is greater than the sum of the energy lost during the energy recovery process and the energy lost during the next power supply, then the energy recovery operation is performed, otherwise the capacitance C1 is indicated. The energy leaked above is less than or equal to the sum of the energy lost during the energy recovery process and the next power supply process, and energy recovery is not necessary.

Embodiment 2: A power management device of this embodiment, as shown in FIG. 3, further includes a switch tube S3 and a switch tube S4, and the first conductive end of the switch tube S3 and the first conductive end of the switch tube S4 The second conductive end of the inductor L1 is electrically connected, the second conductive end of the switch tube S3 is electrically connected to the positive pole of the load 4, the second conductive end of the switch tube S4 is grounded, the control end of the switch tube S3 and the control of the switch tube S4 are controlled. The terminals are electrically connected to the first controller 1, respectively, and the rest of the structure is the same as that of the embodiment 1.

When the power management device supplies power to the load boost, the first controller 1 controls the switch tube S1 to be constantly turned on, and the control switch tube S2 is constantly turned off. At this time, the first controller 1, the power source E1, the inductor L1, the capacitor C1, and the switch The tube S3 and the switch tube S4 form a synchronous rectification BOOST step-up DC-DC topology circuit. The first controller controls the switch tube S3 and the switch tube S4 to be non-overlapping to realize the function of the conventional synchronous rectification BOOST step-up DC-DC topology circuit, and the first controller 1 adjusts the duty ratio of the output control signal. Thereby, the voltage VDD1 that controls the output to the load is stabilized at a certain set value.

The first controller 1, the power source E1, the inductor L1, the capacitor C1, the switch tube S1, the switch tube S2, the switch tube S3 and the switch tube S4 can also form a topology circuit of the synchronous rectification non-inverting output BUCK_Boost buck-boost DC-DC. The first controller 1 controls the switch tube S1 and the switch tube S4 to be in the same phase, and the control switch tube S2 and the switch tube S3 are turned on in the same phase, and the switch tube S1, the switch tube S4 and the switch tube S2/the switch tube S3 are non-overlapping, Realize the function of the traditional synchronous rectification in-phase output BUCK_Boost buck-boost DCDC topology circuit.

When the load is not working, the first control device 1 controls the load 4 to be powered off, and the power management device stops supplying power to the load and performs energy recovery work. When the energy recovery operation is performed, the first controller 1 first controls the switch tube S3 to be constantly turned on, and the control switch tube S4 is constantly turned off, and then cyclically executes the T1 phase and In the T2 phase, until the first voltage detecting module detects that the voltage on the capacitor C1 drops to 0 and the first current detecting module detects that the current in the inductor L1 is also 0, the first controller controls the switch S1 and the switch tube. S2 is disconnected and the entire energy recovery process ends.

Embodiment 3: A power management device of this embodiment, as shown in FIG. 4, includes a second controller 5, a second current detecting module 6, a second voltage detecting module 7, a power source E2, an inductor L2, and a capacitor C2. The switch tube S5 and the switch tube S6, the anode of the power source E2 is electrically connected to the first conduction end of the switch tube S5 and the first detection end of the second current detecting module 6, and the second conduction end of the switch tube S5 is connected to the inductor L2. The first conducting end, the second detecting end of the second current detecting module 6 and the first conducting end of the switch tube S6 are electrically connected, and the second conducting end of the switch tube S6 is grounded to one end of the capacitor C2 and the end of the load, the capacitor The other end of C2 is electrically connected to the other end of the load, the second conducting end of the inductor L2 and the negative pole of the power source E2, and the second controller 5 is respectively connected with the control end of the switch tube S5, the control end of the switch tube S6, and the second current detecting module. The data output of 6, the data output of the second voltage detection module 7 and the control terminal of the load 4 are electrically connected.

When the power management device supplies power to the load, the second controller 5, the power source E2, the inductor L2, the capacitor C2, the switch tube S5, and the switch tube S6 form a reverse output synchronous rectification BUCK-BOOST buck-boost DC-DC topology circuit. The second controller 5 controls the switch tube S5 and the switch tube S6 to be non-overlapping to achieve the function of the conventional reverse output synchronous rectification BUCK-BOOST buck-boost DC-DC topology circuit.

When the load 4 is not working, the second controller 5 controls the load 4 to be powered off, and the power management device stops supplying power to the load 4 and performs energy recovery work. The energy recovery work includes the T3 phase and the T4 phase, as shown in Figure 5.

T3 stage: the second controller 5 controls the switch tube S6 to be turned on, the control switch tube S5 is turned off, the capacitor C2 forms a path to the ground via the inductor L2 and the switch tube S6, and the capacitor C2 charges the inductor L2. During the charging process, the capacitor The voltage VDD2 on C2 falls, the energy portion of capacitor C2 is transferred to inductor L2, and the second current detecting module 6 detects the current in inductor L2. When the second current check When the current value detected by the measuring module 6 is greater than or equal to the preset value Ip2, the second controller 5 controls the switching tube S6 to be disconnected, and the T3 phase ends, and enters the T4 phase;

T4 stage: after the switch tube S6 is disconnected, the second controller 5 controls the switch tube S5 to be turned on, the inductor L2 and the switch tube S5 form a path to the power source E2, the inductor L2 charges the power source E2, and the current in the inductor L2 decreases. The two current detecting module 6 detects the current in the inductor L2. When the current value detected by the second current detecting module 6 is equal to 0, the T4 phase ends and the T3 phase is re-entered.

The T3 phase and the T4 phase are cyclically executed until the second voltage detecting module 7 detects that the voltage on the capacitor C2 drops to 0 and the second current detecting module 6 detects that the current in the inductor L2 is also 0, at which time the second controller 5 The control switch S5 and the switch S6 are both disconnected, and the entire energy recovery process ends.

The method for the second controller to determine whether energy recovery work is required includes the following steps:

When the power management device supplies power to the load for the first time, the second controller monitors the voltage drop on the capacitor C2 from the end of the first power supply to the start of the second power supply through the second voltage detecting module, if the voltage drop is greater than the set value Vdrop2 Then, after the next k times of power supply, the energy recovery work needs to be performed, and at the end of the k+1th power supply, the voltage drop on the capacitor C2 between the adjacent two power supplies is restarted, and the power management device does not perform the monitoring. Energy recovery work; if the pressure drop is less than or equal to the set value Vdrop2, no energy recovery is required at the end of the next power supply, and the monitoring of the voltage drop across the capacitor C2 between adjacent power supplies continues until two adjacent times. When the voltage drop across the capacitor C2 is greater than the set value Vdrop2, the energy recovery operation is required after the next k power supply ends, and the capacitance between the adjacent two power supplies is restarted after the k+1th power supply is finished. The pressure drop across C2.

The voltage drop setting value Vdrop2=(Q3+Q4)/C2, Q3 is the energy lost during the energy recovery process to recover the energy from the capacitor C2 to the power supply E2, and Q4 is the power supply E2 charging the capacitor C2 to the setting during the power supply process. The energy lost in the value, C2 is the capacity of the capacitor C2. If the power corresponding to the voltage drop across the capacitor C2 before the start of the previous power supply is greater than the sum of the energy lost during the energy recovery process and the energy lost during the next power supply, the energy recovery operation is performed. Otherwise, It means that the energy leaked on the capacitor C2 is less than or equal to the sum of the energy lost in the energy recovery process and the next power supply process, and energy recovery work is not necessary.

Claims

A power management device, comprising: a controller (1), a current detecting module (2), a voltage detecting module (3), a power source (E1), an inductor (L1), a capacitor (C1), and a first switch tube (S1) and the second switch tube (S2), the positive pole of the power source (E1) is electrically connected to the first conductive end of the first switch tube (S1), and the second conductive end of the first switch tube (S1) The first conduction end of the second switch tube (S2), the first conduction end of the inductor (L1), and the detection end of the current detecting module (2) are electrically connected, and the second conductive end of the inductor (L1) is connected to the voltage The detecting end of the detecting module (3), one end of the capacitor (C1) and the positive pole of the load (4) are electrically connected, the negative pole of the power source (E1), the second conducting end of the second switching tube (S2), and the capacitor ( The other end of C1) and the negative pole of the load (4) are grounded, and the controller (1) is respectively connected with the control end of the first switch tube (S1), the control end of the second switch tube (S2), and the current detecting module ( 2) The data output terminal, the data output terminal of the voltage detecting module (3) and the control terminal of the load (4) are electrically connected.
The power management device according to claim 1, further comprising a third switch tube (S3) and a fourth switch tube (S4), the first switch end of the third switch tube (S3) The first conducting end of the four-switching tube (S4) is electrically connected to the second conducting end of the inductor (L1), and the second conducting end of the third switching transistor (S3) is electrically connected to the positive pole of the load (4), The second conductive end of the four switch tube (S4) is grounded, and the control end of the third switch tube (S3) and the control end of the fourth switch tube (S4) are electrically connected to the controller (1), respectively.
An energy recovery method for a power management apparatus, which is applicable to the power management apparatus of claim 1, comprising the steps of:

When the load (4) is not working, the power management device ends the power supply, and the controller (1) determines whether energy recovery work is required, and if necessary, performs energy recovery work, and if not, does not perform energy recovery work, The energy recovery work includes the following steps:

N1: The controller (1) controls the second switch tube (S2) to be turned on, and controls the first switch tube (S1) Disconnected, the capacitor (C1) charges the inductor (L1), and the current detecting module (2) detects the current in the inductor (L1);

N2: When the current value detected by the current detecting module (2) is greater than or equal to the preset value Ip1, the controller (1) controls the second switching transistor (S2) to be turned off, and controls the first switching transistor (S1) to be turned on, and the inductance ( L1) and capacitor (C1) charge the power supply (E1), and the current detecting module (2) detects the current in the inductor (L1);

N3: When the current value detected by the current detecting module (2) is equal to 0, the voltage detecting module (3) detects the voltage on the capacitor (C1). If the voltage value is greater than 0, the process jumps to step N1, otherwise, the controller ( 1) Both the first switch tube (S1) and the second switch tube (S2) are controlled to be disconnected, and energy recovery is ended.
The energy recovery method of a power management apparatus according to claim 3, wherein the controller (1) determines whether the energy recovery operation is required, and the method includes the following steps:

H1: At the end of the first power supply, the controller (1) judges that energy recovery work is not required;

H2: The controller (1) detects the voltage on the capacitor (C1) through the voltage detecting module (3), and monitors the voltage drop on the capacitor (C1) before the current power supply ends until the next power supply starts;

H3: If the voltage drop on the capacitor (C1) before the start of the next power supply is greater than the set value Vdrop1, it is judged that the energy recovery operation is required after the next n power supply ends, and the n+1th power supply ends. No energy recovery is required until the n+2th power supply starts. Step H2 is re-executed at the end of the n+1th power supply. If the current power supply ends until the next power supply starts, the voltage drop across the capacitor (C1) is less than or equal to When the value Vdrop1 is set, it is judged that the energy recovery operation is not required at the end of the next power supply, and step H2 is re-executed at the end of the next power supply, where n is a natural number.
The energy recovery method of the power management apparatus according to claim 4, wherein the voltage drop setting value Vdrop1=(Q1+Q2)/C1, and Q1 is energy recovery on the capacitor (C1) during energy recovery. Energy lost to the power (E1) process, Q2 is the power supply during the power supply (E1) The energy lost when the capacitor (C1) is charged to the set value, and C1 is the capacity of the capacitor (C1).
A power management device, comprising: a controller (5), a current detecting module (6), a voltage detecting module (7), a power source (E2), an inductor (L2), a capacitor (C2), and a first switch tube (S5) and the second switch tube (S6), the anode of the power source (E2) is electrically connected to the first conduction end of the first switch tube (S5) and the first detection end of the current detecting module (6), The second conducting end of a switching transistor (S5) is electrically connected to the first conducting end of the inductor (L2), the second detecting end of the current detecting module (6), and the first conducting end of the second switching transistor (S6) Connected, the second conduction end of the second switch tube (S6) is grounded to one end of the capacitor (C2) and one end of the load (4), and the other end of the capacitor (C2) and the other end of the load (4), the inductor ( The second conduction end of L2) is electrically connected to the negative pole of the power source (E2), and the controller (5) is respectively connected to the control end of the first switch tube (S5), the control end of the second switch tube (S6), and the current. The data output end of the detecting module (6), the data output end of the voltage detecting module (7) and the control end of the load (4) are electrically connected.
An energy recovery method for a power management device, suitable for the power management device of claim 6, comprising the steps of:

When the load (4) is not working, the power management device ends the power supply, and the controller (5) determines whether energy recovery work is required, and if necessary, performs energy recovery work, and if not, does not perform energy recovery work, The energy recovery work includes the following steps:

M1: The controller (5) controls the second switching transistor (S6) to be turned on, controls the first switching transistor (S5) to be disconnected, the capacitor (C2) charges the inductor (L2), and the current detecting module (6) detects the inductance (L2) Current in

M2: When the current value detected by the current detecting module (6) is greater than or equal to the preset value Ip2, the controller (5) controls the second switching transistor (S6) to be turned off, and controls the first switching transistor (S5) to be turned on, and the inductance ( L2) charging the power source (E2), and the current detecting module (6) detects the current in the inductor (L2);

M3: When the current value detected by the current detecting module (6) is equal to 0, the voltage detecting module (7) detects the voltage on the capacitor (C2), and if the voltage value is greater than 0, it jumps to step M1, otherwise, The controller (5) controls both the first switching transistor (S5) and the second switching transistor (S6) to be turned off, and energy recovery ends.
The energy recovery method of a power management apparatus according to claim 7, wherein the controller (5) determines whether a method for performing an energy recovery operation includes the following steps:

F1: At the end of the first power supply, the controller (5) determines that energy recovery work is not required;

F2: The controller (5) detects the voltage on the capacitor (C2) through the voltage detecting module (7), and monitors the voltage drop on the capacitor (C2) before the current power supply ends until the next power supply starts;

F3: If the voltage drop on the capacitor (C2) before the start of the next power supply is greater than the set value Vdrop2, it is judged that the energy recovery operation is required after the next k times of power supply, and the k+1th power supply ends. No energy recovery is required until the k+2th power supply starts. Step H2 is re-executed at the end of the k+1th power supply. If the current power supply ends until the next power supply starts, the voltage drop across the capacitor (C2) is less than or equal to When the value Vdrop2 is set, it is judged that the energy recovery operation is not required at the end of the next power supply, and step F2 is re-executed at the end of the next power supply, where k is a natural number.
The energy recovery method of the power management apparatus according to claim 8, wherein the voltage drop setting value Vdrop2=(Q3+Q4)/C2, and Q3 is energy recovery on the capacitor (C2) during energy recovery. The energy lost to the power (E2) process, Q4 is the energy lost when the power supply (E2) charges the capacitor (C2) to the set value during power supply, and C2 is the capacity of the capacitor (C2).