CN107070200A - Resonant devices - Google Patents

Abstract

An embodiment of the present application provides a resonant device, including: a bidirectional resonant unit, the bidirectional resonant unit includes: a series circuit, the series circuit includes a first capacitor and a first inductor connected in series with the first capacitor, the The first end of the series circuit is connected to the first end of the bidirectional resonant unit, and the second end of the series circuit is connected to the third end of the bidirectional resonant unit; the bidirectional resonant unit also includes: a second inductance , the first end of the second inductance is connected to the first end of the bidirectional resonant unit, the second end of the second inductance is connected to the second end of the bidirectional resonant unit; the third inductance, the first end of the bidirectional resonant unit The first end of the three inductors is connected to the third end of the bidirectional resonance unit, and the second end of the third inductor is connected to the fourth end of the bidirectional resonance unit. The resonant device in the embodiment of the present application can realize the boost function in both the forward working mode and the reverse working mode, thereby improving the utilization rate of the circuit.

Description

Resonant equipment

technical field

The embodiments of the present application relate to the field of electronics, and more specifically, relate to a resonance device.

Background technique

With the advancement of battery technology, the wide application of motors, and the increasing number of electric vehicles and electric products, they have begun to popularize our lives, and basically without exception, there will be a battery in this type of electric equipment, the smallest is A battery cell, as large as the battery pack of an electric vehicle, often stores a few kilowatt-hours to dozens of kilowatt-hours of electricity in it. Charging the battery pack is generally inseparable from a low-power charger or a high-power charger. The most commonly used function of the charger is to convert 220V or 380V AC power into the DC power required by the battery pack, and then through the battery management system to charge the battery pack. to charge.

However, as the power of the battery pack increases, and when the power reaches tens of kilowatt-hours, another new application requirement will arise, which is to reverse the power in the battery pack and reverse the DC power of the battery pack. To become the 220V or 380V AC we usually use. Existing resonant devices can realize bidirectional transmission of energy, but limited by the topology, only the forward working mode can realize the boosting function, and the reverse working mode cannot realize the boosting function.

Contents of the invention

An embodiment of the present application provides a resonant device capable of realizing a voltage boosting function in both a forward working mode and a reverse working mode.

In a first aspect, a resonant device is provided, including: a bidirectional resonant unit, the first end of the bidirectional resonant unit is connected to the positive pole of the positive input voltage source of the resonant device, and the second end of the bidirectional resonant unit connected to the negative pole of the positive input voltage source, the third terminal of the bidirectional resonance unit is connected to the first terminal of the first load, the fourth terminal of the bidirectional resonance unit is connected to the second terminal of the first load connect,

Or the first end of the bidirectional resonant unit is connected to the first end of the first load, the second end of the bidirectional resonant unit is connected to the second end of the first load, and the second end of the bidirectional resonant unit The three terminals are connected to the positive pole of the reverse input voltage source of the resonance device, and the fourth terminal of the bidirectional resonance unit is connected to the negative pole of the reverse input voltage source;

The bidirectional resonant unit includes: a series circuit, the series circuit includes a first capacitor (101) and a first inductor (102) connected in series with the first capacitor, the first end of the series circuit is connected to the bidirectional The first end of the resonance unit is connected, and the second end of the series circuit is connected to the third end of the bidirectional resonance unit;

The bidirectional resonance unit also includes:

A second inductance (103), the first end of the second inductance is connected to the first end of the bidirectional resonant unit, and the second end of the second inductance is connected to the second end of the bidirectional resonant unit;

A third inductor (104), the first terminal of the third inductor is connected to the third terminal of the bidirectional resonance unit, and the second terminal of the third inductor is connected to the fourth terminal of the bidirectional resonance unit.

Specifically, the bidirectional resonance unit includes a first terminal, a second terminal, a third terminal, and a fourth terminal. When the first terminal and the second terminal of the bidirectional resonance unit are voltage input terminals of the bidirectional resonance unit, the The third terminal and the fourth terminal of the bidirectional resonant unit are the voltage output terminals of the bidirectional resonant unit, when the third terminal and the fourth terminal of the bidirectional resonant unit are the voltage input terminals of the bidirectional resonant unit, the The first terminal and the second terminal of the bidirectional resonance unit are voltage output terminals of the bidirectional resonance unit. Therefore, the bidirectional resonant unit includes two working modes, forward and reverse.

The rise and fall of the voltage by the resonant device depends on the frequency of the voltage input at the voltage input terminal. Suppose the operating frequency of the circuit is Fs, the series resonance frequency of the first capacitor and the first inductor is F1, the series resonance frequency of the first capacitor, the first inductor and the third inductor is F2, the first capacitor, the first inductor and the second The series resonant frequency of the inductor is F3, and the circuit gain is G. In the forward working mode, the second inductor does not participate in the resonance. When Fs≥F1, the circuit is in the step-down mode, and when F2≤Fs≤F1, the circuit is in the boost mode; in the reverse working mode, the third inductor Does not participate in resonance, when Fs≥F1, the circuit is in buck mode, when F3≤Fs≤F1, the circuit is in boost mode.

The resonant device in the embodiment of the present application can realize the bidirectional boosting function in the forward working mode and the reverse working mode by adjusting the frequency of the input voltage, thereby improving the utilization rate of the circuit.

It should be understood that the resonant device in the embodiment of the present application may be a vehicle charger, or other devices such as a photovoltaic generator, which is not limited in the embodiment of the present application.

In a first possible implementation manner of the first aspect, the bidirectional resonance unit further includes:

A second capacitor (105), the first end of the second capacitor is connected to the second end of the second inductance, and the second end of the second inductance is connected to the bidirectional resonant unit through the second capacitor The second end is connected.

With reference to the above possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the bidirectional resonant unit further includes:

A third capacitor (106), the first end of the third capacitor is connected to the second end of the third inductance, the second end of the third inductance is connected to the bidirectional resonant unit through the third capacitor The fourth terminal is connected.

In this way, in the forward working mode, the first capacitor, the first inductor, the third capacitor and the third inductor participate in the resonance, the second capacitor and the second inductor do not participate in the resonance, and are only used to provide excitation current; in the reverse working mode In this case, the first capacitor, the first inductor, the second capacitor and the second inductor participate in the resonance, the third capacitor and the third inductor do not participate in the resonance, and are only used for providing excitation current.

The resonant device in the embodiment of the present application, on the basis of realizing the bidirectional boosting function in the forward working mode and the reverse working mode, can also improve the boosting capability of the circuit, thereby improving the efficiency of the circuit and the flexibility of design.

With reference to the above possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the resonance device further includes:

An isolation transformer, the first terminal and the second terminal of the isolation transformer are respectively connected to the positive pole and the negative pole of the positive input voltage source, and the third terminal and the fourth terminal of the isolation transformer are respectively connected to the bidirectional resonance unit The first end is connected to the second end,

The isolation transformer is used for:

The DC voltage of the positive input voltage source is converted into an AC voltage and output to the bidirectional resonance unit.

It should be understood that the isolation transformer may be a single-winding transformer or a multi-winding transformer, which is not limited in this embodiment of the present application. The position of the isolation transformer in the topology may be at the input position of the circuit, at the output position of the circuit, or in the middle of the bidirectional resonant unit, which is not limited in this embodiment of the present application.

With reference to the above possible implementation of the first aspect, in a fourth possible implementation of the first aspect, the isolation transformer is a multi-winding transformer, and the isolation transformer further includes: a fifth terminal and a sixth terminal, so The fifth end and the sixth end of the isolation transformer are respectively connected to the first end and the second end of the second load;

The isolation transformer is also used for:

Converting the DC voltage of the positive input voltage source into an AC voltage and outputting it to the second load.

It should be understood that the voltages of the fifth terminal and the sixth terminal of the multi-winding transformer are obtained only through the multi-winding transformer, and do not pass through the bidirectional resonant unit, so they are not affected by frequency changes, but are only affected by the transformation ratio and input voltage of the multi-winding transformer The effect of size. In this way, regardless of the forward and reverse directions and how the voltage frequency changes, as long as the input voltage of the multi-winding transformer is consistent, a fixed auxiliary source voltage can be obtained, which is very suitable for applications with this requirement.

In the resonant device of the embodiment of the present application, after the auxiliary winding is added to the isolation transformer, the design of the auxiliary power supply can be omitted, which saves the cost.

With reference to the above possible implementation manner of the first aspect, in a fifth possible implementation manner of the first aspect, the resonance device further includes:

A first frequency modulation FM generating unit and a first rectifying unit, wherein the first end and the second end of the first FM generating unit are respectively connected to the positive pole and the negative pole of the positive input voltage source, and the first FM The third terminal and the fourth terminal of the generating unit are respectively connected to the first terminal and the second terminal of the isolation transformer, and the third terminal and the fourth terminal of the bidirectional resonance unit are respectively connected to the first terminal of the first rectifying unit. connected to the second terminal, the third terminal and the fourth terminal of the first rectifier unit are respectively connected to the first terminal and the second terminal of the first load,

The first FM generating unit is used for:

converting the DC voltage of the positive input voltage source into a DC pulse voltage, and outputting it to the isolation transformer;

The first rectifying unit is used for:

The AC voltage output by the bidirectional resonance unit is converted into a DC voltage and output to the first load.

It should be understood that this part of the unit is generally composed of metal-oxide-semiconductor field-effect transistors, referred to as metal-oxide-semiconductor field-effect transistors (MOSFETs), including but not limited to half-bridge MOSFETs and full-bridge MOSFETs. MOSFET connections. The first FM generation unit is used to generate a frequency modulation (frequency modulation, FM) DC pulse wave and input it to the bidirectional resonant unit by switching the input DC voltage through a 50% duty cycle switching mode during forward input. The first rectification unit is used to rectify the output by using the body diode of the MOSFET when outputting in the forward direction, so that the AC voltage output by the isolation transformer becomes a DC voltage.

With reference to the above possible implementation manner of the first aspect, in a sixth possible implementation manner of the first aspect, the resonance device further includes:

A second FM generating unit and a second rectifying unit, wherein the third end and the fourth end of the second FM generating unit are respectively connected to the positive pole and the negative pole of the reverse input voltage source, and the second FM generating unit The first terminal and the second terminal of the two-way resonant unit are respectively connected to the third terminal and the fourth terminal, and the first terminal and the second terminal of the isolation transformer are respectively connected to the third terminal and the fourth terminal of the second rectifying unit. The fourth terminal is connected, the first terminal and the second terminal of the second rectifying unit are respectively connected to the first terminal and the second terminal of the third load,

The second FM generating unit is used for:

converting the DC voltage of the reverse input voltage source into a DC pulse voltage, and outputting it to the bidirectional resonance unit;

The isolation transformer is also used for:

converting the DC pulse voltage output by the bidirectional resonance unit into an AC voltage, and outputting it to the second rectification unit;

The second rectification unit is used for:

The AC voltage output by the isolation transformer is converted into a DC voltage, and output to the third load.

It should be understood that the above-mentioned first FM generating unit and the second rectifying unit may be two independent units, or may be integrated into one unit, and the above-mentioned second FM generating unit and the first rectifying unit may be two independent units, or integrated into one unit, which is not limited in this embodiment of the present application.

With reference to the above possible implementation manner of the first aspect, in a seventh possible implementation manner of the first aspect, the resonance device further includes:

an FM control unit, the FM control unit is connected to the first FM generating unit and the second FM generating unit,

The FM control unit is used for:

Determine the voltage input direction of the bidirectional resonance unit, and input a DC pulse voltage to the first FM generating unit or input a DC pulse voltage to the second FM generating unit according to the voltage input direction.

With reference to the above possible implementation of the first aspect, in an eighth possible implementation of the first aspect, at least one of the first inductance, the second inductance, and the third inductance is a single magnetic inductance Or magnetically integrated inductors.

With reference to the above possible implementation manner of the first aspect, in a ninth possible implementation manner of the first aspect, the resonance device further includes: a voltage sampling and error amplification unit, the voltage sampling and error amplification unit is connected to the The FM controller is connected to the first load or the third load, and the FM control unit is also used to: generate a reference voltage, and deliver the reference voltage to the voltage sampling and error amplification unit; the voltage The sampling and error amplification unit is configured to: obtain the DC voltage output by the first load or the third load, and compare it with the reference voltage, obtain a first error amplification value, and amplify the first error The value is transmitted to the FM control unit; the FM control unit is further configured to: adjust the frequency of the DC voltage output by the FM according to the first error amplification value.

Description of drawings

FIG. 1 is a schematic circuit diagram of a resonant device provided by an embodiment of the present application.

Fig. 2 is a schematic circuit diagram of another resonant device provided by an embodiment of the present application.

Fig. 3 is a schematic diagram of an equivalent circuit of a resonant device provided in an embodiment of the present application in a forward working mode.

Fig. 4 is a normalized gain curve diagram of the resonant device provided in the embodiment of the present application in the forward working mode.

Fig. 5 is a schematic diagram of an equivalent circuit of a resonant device provided in an embodiment of the present application in a reverse working mode.

Fig. 6 is a normalized gain curve diagram of the resonant device provided in the embodiment of the present application in the reverse working mode.

Fig. 7 is a schematic circuit diagram of another resonant device provided by an embodiment of the present application.

Fig. 8 is a schematic circuit diagram of another resonant device provided by an embodiment of the present application.

FIG. 9 is a schematic circuit diagram of a bidirectional topology connection of a resonant device provided in an embodiment of the present application.

FIG. 10 is a schematic diagram of another bidirectional topology connection method of a resonant device provided by an embodiment of the present application.

Fig. 11 is a control block diagram of a resonant device provided by an embodiment of the present application.

Fig. 12 is a control block diagram of another resonant device provided by an embodiment of the present application.

Fig. 13 is a schematic circuit diagram of another resonant device using two-phase parallel connection provided by the embodiment of the present application.

Reference signs:

101-the first capacitor

102-First inductance

103-Second inductance

104-the third inductance

105-Second capacitor

106-the third capacitor

detailed description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

It should be noted that in the following description, when two elements are "connected", the two elements may be directly connected or indirectly connected through one or more intermediate elements/mediums. The manner in which two elements are connected may include a contact manner or a non-contact manner, or may include a wired manner or a wireless manner. Those skilled in the art can make equivalent replacements or modifications to the exemplary connection methods described below, and such replacements or modifications all fall within the protection scope of the present application.

Fig. 1 shows a schematic circuit diagram of a resonant device 100 provided by an embodiment of the present application, and the resonant device 100 includes:

A bidirectional resonant unit 110, the first end (a) of the bidirectional resonant unit is connected to the positive pole of the positive input voltage source of the resonant device, and the second end (b) of the bidirectional resonant unit is connected to the positive input The negative pole of the voltage source is connected, the third terminal (c) of the bidirectional resonance unit is connected to the first terminal of the first load, the fourth terminal d of the bidirectional resonance unit is connected to the second terminal of the first load,

Or the first end (a) of the bidirectional resonant unit is connected to the first end of the first load, and the second end (b) of the bidirectional resonant unit is connected to the second end of the first load, so The third terminal (c) of the bidirectional resonance unit is connected to the positive pole of the reverse input voltage source of the resonance device, and the fourth terminal (d) of the bidirectional resonance unit is connected to the negative pole of the reverse input voltage source;

The bidirectional resonant unit includes: a series circuit, the series circuit includes a first capacitor Cr (101) and a first inductor Lr (102) connected in series with the first capacitor, the first end of the series circuit is connected to the The first end (a) of the bidirectional resonant unit is connected, and the second end of the series circuit is connected to the third end (c) of the bidirectional resonant unit;

The bidirectional resonance unit also includes:

The second inductance Lm1 (103), the first end of the second inductance is connected to the first end (a) of the bidirectional resonant unit, the second end of the second inductance is connected to the second end of the bidirectional resonant unit Terminal (b) is connected;

A third inductance Lm2 (104), the first end of the third inductance is connected to the third end (c) of the bidirectional resonant unit, the second end of the third inductance is connected to the fourth end of the bidirectional resonant unit Terminal (d) is connected.

Specifically, as shown in FIG. 1, the above-mentioned bidirectional resonant unit includes a first end (a), a second end (b), a third end (c) and a fourth end (d), wherein the first end and the second end The terminal is Vdcl, the third terminal and the fourth terminal are Vdc2, the first terminal and the second terminal, the third terminal and the fourth terminal of the bidirectional resonant unit can be respectively used as the input terminal or the output terminal of the bidirectional resonant unit. Specifically, when the first terminal and the second terminal of the bidirectional resonance unit are the voltage input terminals of the bidirectional resonance unit, the third terminal and the fourth terminal of the bidirectional resonance unit are the voltage input terminals of the bidirectional resonance unit. output terminal, when the third terminal and the fourth terminal of the bidirectional resonant unit are the voltage input terminals of the bidirectional resonant unit, the first terminal and the second terminal of the bidirectional resonant unit are the voltage of the bidirectional resonant unit output. Therefore, the bidirectional resonant unit includes two working modes, forward and reverse. Therefore, Vdc1 in the embodiment of the present application can be used as both the input terminal in the forward working mode and the output terminal in the reverse working mode, and Vdc2 can be used as the output terminal in the forward working mode or as the reverse working mode. The input terminal in the working mode is not limited in this embodiment of the present application. It should be understood that the forward working mode herein refers to transferring energy from Vdc1 to Vdc2, and the reverse working mode refers to transferring energy from Vdc2 to Vdc1. Therefore, in the forward working mode, the bidirectional resonant unit can boost the first voltage of Vdc1 and output the second voltage at Vdc2, and in the reverse working mode, the bidirectional resonant unit can boost the third voltage of Vdc2 and output the second voltage at Vdc2. Vdc1 outputs a fourth voltage.

In the forward working mode, Cr, Lr and Lm2 participate in the resonance, and Lml does not participate in the resonance, and is only used to provide the excitation current. It should be understood that the rise and fall of the voltage by the resonant device depends on the frequency of the voltage input at the input terminal. The operating frequency of the circuit is Fs, which is the frequency of the input voltage Vdc1, the series resonance frequency of Cr and Lr is F1, the series resonance frequency of Cr, Lr and Lm2 is F2, and the circuit gain is G, where,

When Fs≥F1, the circuit is in step-down mode, and the equivalent impedance of Cr and Lr in series will produce a voltage drop, that is, a part of the input voltage will be divided, so that the output voltage Vdc2 will be less than Vdcl, the gain G will be less than 1, and the output The voltage Vdc2 is lower than the input voltage Vdcl; when F2≤Fs≤F1, the circuit is in boost mode, Lm2 participates in resonance, and it provides excitation current in the first part of each cycle, while in the latter part of each cycle Cr, Lr and Lm2 generate series resonance, and the energy stored in Lm2 is transferred to Cr, so that the voltage on Cr rises. In the part of the time before the next cycle, Cr and Lr are output in series, so the output voltage will rise, so as to realize the output voltage Vdc2 is greater than Vdc1, the gain G is greater than 1, and the output voltage Vdc2 is higher than the input voltage Vdc1; when Fs≤F2, the switching tube cannot realize zero voltage switching (ZVS), therefore, the frequency Fs of the input voltage must not be less than F2.

Similarly, in the reverse working mode, Cr, Lr and Lm1 participate in resonance, and Lm2 does not participate in resonance, and is only used to provide excitation current. The operating frequency of the circuit is Fs, which is the frequency of the input voltage Vdc2, the series resonance frequency of Cr and Lr is F1, the series resonance frequency of Cr, Lr and Lm1 is F3, and the circuit gain is G, where,

When Fs is F1, the circuit is in step-down mode, the gain G is less than 1, and the output voltage Vdc1 is lower than the input voltage Vdc2; when F3≤Fs≤F1, the circuit is in boost mode, the gain G is greater than 1, and the output voltage Vdcl is higher than Input voltage Vdc2; when Fs≤F3, the switching tube cannot realize ZVS, therefore, the frequency Fs of the input voltage must not be less than F3.

It should be understood that soft switching technology uses the resonance principle of inductive and capacitive components to reduce the voltage across the power switching device to zero before turning it on, and to reduce the current in the power switching device to zero when it is turned off to realize the power switch. The device has zero-loss turn-on and turn-off and reduces switch stress. With the development of communication technology and power system, higher requirements are put forward for the performance, weight, volume, efficiency and reliability of communication switching power supply and electric operation power supply. The soft switching technology can realize the zero-voltage switching or zero-current switching of the switching tube, reduce the switching loss, and improve the conversion efficiency of the converter.

With the wide application of electric motors, there are more and more electric vehicles and electric products. There will be a battery in this type of electric equipment. The small battery is a single battery, and the large one is like a battery pack of an electric vehicle. It often stores several kilowatt-hours of electricity. To tens of degrees of electricity in it. Charging the battery pack is generally inseparable from a low-power charger or a high-power charger. The most commonly used function of the charger is to convert 220V or 380V AC power into the DC power required by the battery pack, and then through the battery management system to charge the battery pack. to charge. However, as the power of the battery pack increases, and when the power reaches tens of kilowatt-hours, another new application requirement will arise, which is to reverse the power in the battery pack and reverse the DC power of the battery pack. To become the 220V or 380V AC we usually use. Existing resonant devices can realize bidirectional transmission of energy, but limited by the topology, only the forward working mode can realize the boosting function, and the reverse working mode cannot realize the boosting function.

However, the resonant device in the embodiment of the present application can realize the bidirectional boosting function in the forward working mode and the reverse working mode by adjusting the frequency of the input voltage, thereby improving the utilization rate of the circuit.

It should be understood that the resonant device in the embodiment of the present application may be a vehicle charger, or other devices such as a photovoltaic generator, which is not limited in the embodiment of the present application.

As an optional embodiment, the bidirectional resonance unit 110 further includes:

A second capacitor Cm1 (105), the first end of the second capacitor is connected to the second end of the second inductance, and the second end of the second inductance is connected to the bidirectional resonant unit through the second capacitor The second end (b) of the connection.

As an optional embodiment, the bidirectional resonance unit further includes:

A third capacitor Cm2 (106), the first end of the third capacitor is connected to the second end of the third inductance, and the second end of the third inductance is connected to the bidirectional resonant unit through the third capacitor The fourth terminal (d) connection.

Specifically, the bidirectional resonant unit 110 may further include a second capacitor Cm1 (105) and/or a third capacitor Cm2 (106), so as to improve the boosting capability of the circuit, thereby improving efficiency. FIG. 2 shows a schematic circuit diagram of another resonant device 200 provided by an embodiment of the present application. In the resonant device 200, the bidirectional resonant unit further includes a second capacitor Cm1 and a third capacitor Cm2, wherein Cm1 and Lm1 are connected in series, Cm2 and Lm2 are connected in series.

In this way, in the forward working mode, Cr, Lr, Cm2 and Lm2 participate in the resonance, Lml and Cml do not participate in the resonance, and are only used to provide excitation current; in the reverse working mode, Cr, Lr, Cm1 and Lm1 participate in the resonance, Lm2 and Cm2 do not participate in resonance, they are only used to provide excitation current.

The resonant device in the embodiment of the present application, on the basis of realizing the bidirectional boosting function in the forward working mode and the reverse working mode, can also improve the boosting capability of the circuit, thereby improving the efficiency of the circuit and the flexibility of design.

As an optional embodiment, at least one of the first inductor Lr, the second inductor Lm1 and the third inductor Lm2 is a single magnetic inductor or a magnetically integrated inductor.

FIG. 3 shows a schematic diagram of an equivalent circuit of a resonant device provided in an embodiment of the present application in a forward working mode, and Ro is a load. In the forward working mode, the current will flow through the series circuit composed of Cr, Lr, Cm2 and Lm2, the series resonant frequency of Cr and Lr is F1, and the series resonant frequency of Cr, Lr, Cm2 and Lm2 is F2′, where,

Fig. 4 shows a normalized gain curve of the resonant device provided in the embodiment of the present application in the forward working mode.

When Fs≥F1, the circuit is in step-down mode, the gain G is less than 1, the output voltage Vdc2 is lower than the input voltage Vdc1, and the bidirectional resonant unit works in the first zone; when F2′≤Fs≤F1, the circuit is in boost mode , the gain G is greater than 1, and the output voltage Vdc2 is higher than the input voltage Vdc1. At this time, the bidirectional resonant unit works in the second zone; when Fs≤F2′, the switch tube cannot realize ZVS, and it will work in the ZCS zone at this time, in this zone , the excitation current of the switching tube has dropped to zero before it is turned off, so the excitation current cannot be provided for the other switching tube to achieve ZVS. If the other switching tube is turned on at this time, hard switching will occur, and the inrush current will be large, which will damage the device. Therefore, the frequency Fs of the input voltage is prohibited to be smaller than F2'.

FIG. 5 shows a schematic diagram of an equivalent circuit of a resonant device provided in an embodiment of the present application in a reverse working mode, where Ro is a load. In the reverse working mode, the current will flow through the series circuit composed of Cr, Lr, Cm1 and Lml, the series resonance frequency of Cr and Lr is F1, and the series resonance frequency of Cr, Lr, Cml and Lml is F3′, where,

Fig. 6 is a normalized gain curve diagram of the resonant device provided in the embodiment of the present application in the reverse working mode.

When Fs is F1, the circuit is in step-down mode, the gain G is less than 1, the output voltage Vdc1 is lower than the input voltage Vdc2, at this time the bidirectional resonant unit works in the first zone; when F3′≤Fs≤F1, the circuit is in boost mode , the gain G is greater than 1, and the output voltage Vdc1 is higher than the input voltage Vdc2. At this time, the bidirectional resonant unit works in the second zone; when Fs≤F3', the switching tube cannot realize ZVS, so the frequency Fs of the input voltage must not be less than F3'.

The resonant device in the embodiment of the present application, on the basis of realizing the bidirectional boosting function in the forward working mode and the reverse working mode, can also improve the boosting capability of the circuit, thereby improving the efficiency of the circuit and the flexibility of design.

Optionally, the resonant device may also include an isolation transformer for obtaining a desired output voltage. It should be understood that the isolation transformer may be a single-winding transformer or a multi-winding transformer, which is not limited in this embodiment of the present application. The position of the isolation transformer in the topology may be at the input position of the circuit, at the output position of the circuit, or in the middle of the bidirectional resonant unit, which is not limited in this embodiment of the present application.

As an optional embodiment, the resonance device further includes:

An isolation transformer, the first terminal and the second terminal of the isolation transformer are respectively connected to the positive pole and the negative pole of the positive input voltage source, and the third terminal and the fourth terminal of the isolation transformer are respectively connected to the bidirectional resonance unit The first end is connected to the second end,

The isolation transformer is used for:

The DC voltage of the positive input voltage source is converted into an AC voltage and output to the bidirectional resonance unit.

As an optional embodiment, the isolation transformer is a multi-winding transformer, and the isolation transformer further includes: a fifth terminal and a sixth terminal, and the fifth terminal and the sixth terminal of the isolation transformer are connected to the second load respectively. the first end is connected to the second end;

The isolation transformer is also used for:

Converting the DC voltage of the positive input voltage source into an AC voltage and outputting it to the second load.

As an optional embodiment, the isolation transformer is a multi-winding transformer, and the isolation transformer further includes: a third terminal, the third terminal of the isolation transformer is connected to the voltage output terminal of the resonant device;

The isolation transformer is also used for:

Converting the DC voltage input by the voltage input terminal of the resonant device into an AC voltage, and outputting it at the third terminal of the isolation transformer.

It should be understood that the voltage at the third terminal of the multi-winding transformer is obtained only through the multi-winding transformer and does not pass through the bidirectional resonant unit, so it is not affected by frequency changes, but only affected by the transformation ratio and input voltage of the multi-winding transformer. In this way, regardless of the forward and reverse directions and how the voltage frequency changes, as long as the input voltage of the multi-winding transformer is consistent, a fixed auxiliary source voltage can be obtained, which is very suitable for applications with this requirement. Therefore, in the resonant device of the embodiment of the present application, after the auxiliary winding is added to the isolation transformer, the design of the auxiliary power supply can be omitted, which saves costs.

FIG. 7 shows a schematic circuit diagram of another resonant device 700 provided by an embodiment of the present application. As shown in Figure 7, the first end (e) and the second end (f) of the isolation transformer are respectively connected to the third end (c) and the fourth end (d) of the bidirectional resonant unit, the isolation The transformer is used to convert the DC voltage output by the bidirectional resonant unit into an AC voltage, and output it at the third terminal (g) and the fourth terminal (h) of the isolation transformer, or convert the third terminal of the isolation transformer to (g) and the DC voltage input by the fourth terminal (h) is converted into an AC voltage, and output at the first terminal (e) and the second terminal (f) of the isolation transformer, that is, it is sent to the bidirectional resonance unit .

Specifically, in the forward working mode, the voltage first passes through the bidirectional resonant unit, and then passes through the isolation transformer. The bidirectional resonant unit can process the DC voltage input by Vdc1 and deliver the processed DC voltage to the isolation transformer. The transformer converts the DC voltage into an AC voltage and outputs it at Vdc2; in the reverse working mode, the voltage first passes through the isolation transformer, and then passes through the bidirectional resonant unit. The isolation transformer can convert the DC voltage input by Vdc2 into an AC voltage and output it to The bidirectional resonant unit processes the AC voltage and outputs the processed AC voltage at Vdc1.

FIG. 8 shows a schematic circuit diagram of another resonant device 800 provided by an embodiment of the present application. The resonant device in Figure 8 can realize isolated multi-channel output. In the forward working mode, the voltage from Vdcl to Vdc3 is obtained only through the isolation transformer, not through the bidirectional resonant unit. Therefore, the voltage at Vdc3 will not be affected by the change of the working frequency The impact is only related to the transformation ratio of the transformer and the size of the input voltage.

FIG. 9 shows a schematic diagram of a bidirectional topology connection of a resonant device provided by an embodiment of the present application. In Figure 9, the positive input half-bridge and output full-bridge connection method is adopted. In the forward working mode, input a DC source, through the switch tubes Q1 and Q2, Q1 and Q2 adopt a 50% duty cycle and switch at a certain frequency Fs, a DC pulse voltage with a frequency of Fs can be obtained, and then input to the bidirectional resonance The unit, through the isolation transformer, and then rectified by the switch tubes Q3-Q6, can obtain another required isolated DC output voltage.

FIG. 10 shows a schematic diagram of another bidirectional topology connection method of a resonant device provided by an embodiment of the present application. In Figure 10, the reverse input full bridge and output half bridge connection method is adopted. In the reverse working mode, input a DC source, through the switch tubes Q3-Q6, among which Q5, Q6 and Q3, Q4 adopt a 50% duty cycle and switch at a certain frequency Fs, a DC pulse voltage with a frequency of Fs can be obtained, Through the isolation transformer, then through the bidirectional resonant unit, and then rectified by Q1 and Q2, another required isolated DC output voltage can be obtained.

As an optional embodiment, the resonance device further includes:

A first frequency modulation FM generating unit and a first rectifying unit, wherein the first end and the second end of the first FM generating unit are respectively connected to the positive pole and the negative pole of the positive input voltage source, and the first FM The third terminal and the fourth terminal of the generating unit are respectively connected to the first terminal and the second terminal of the isolation transformer, and the third terminal and the fourth terminal of the bidirectional resonance unit are respectively connected to the first terminal of the first rectifying unit. connected to the second terminal, the third terminal and the fourth terminal of the first rectifier unit are respectively connected to the first terminal and the second terminal of the first load,

The first FM generation unit is used for:

converting the DC voltage of the positive input voltage source into a DC pulse voltage, and outputting it to the isolation transformer;

The first rectifying unit is used for:

The AC voltage output by the bidirectional resonance unit is converted into a DC voltage and output to the first load.

It should be understood that this part of the unit is generally composed of metal-oxide-semiconductor field-effect transistors, referred to as metal-oxide-semiconductor field-effect transistors (MOSFETs), including but not limited to half-bridge MOSFETs and full-bridge MOSFETs. MOSFET connections. The first FM generation unit is used to generate a frequency modulation (frequency modulation, FM) DC pulse wave and input it to the bidirectional resonant unit by switching the input DC voltage through a 50% duty cycle switching mode during forward input. The first rectification unit is used to rectify the output by using the body diode of the MOSFET when outputting in the forward direction, so that the AC voltage output by the isolation transformer becomes a DC voltage.

As an optional embodiment, the resonance device further includes:

A second FM generating unit and a second rectifying unit, wherein the third end and the fourth end of the second FM generating unit are respectively connected to the positive pole and the negative pole of the reverse input voltage source, and the second FM generating unit The first terminal and the second terminal of the two-way resonant unit are respectively connected to the third terminal and the fourth terminal, and the first terminal and the second terminal of the isolation transformer are respectively connected to the third terminal and the fourth terminal of the second rectifying unit. The fourth terminal is connected, the first terminal and the second terminal of the second rectifying unit are respectively connected to the first terminal and the second terminal of the third load,

The second FM generating unit is used for:

converting the DC voltage of the reverse input voltage source into a DC pulse voltage, and outputting it to the bidirectional resonance unit;

The isolation transformer is also used for:

converting the DC pulse voltage output by the bidirectional resonance unit into an AC voltage, and outputting it to the second rectification unit;

The second rectification unit is used for:

The AC voltage output by the isolation transformer is converted into a DC voltage, and output to the third load.

It should be understood that this part of the units is generally composed of MOSFETs, including but not limited to half-bridge MOSFETs and full-bridge MOSFETs. When the second rectification unit is used for reverse output, the MOSFET body diode is used for output rectification, so that the AC voltage output by the isolation transformer becomes a DC voltage, and the second FM generation unit is used for reverse input, the input DC voltage is passed through 50 % duty cycle switch mode, generate a frequency modulated FM DC pulse wave input to the bidirectional resonant unit.

It should also be understood that the above-mentioned first FM generating unit and the second rectifying unit may be two independent units, or may be integrated into one unit, and the above-mentioned second FM generating unit and the first rectifying unit may be two independent units, or It may be integrated into one unit, which is not limited in this embodiment of the present application.

As an optional embodiment, the resonance device further includes:

an FM control unit, the FM control unit is connected to the first FM generating unit and the second FM generating unit,

The FM control unit is used for:

Determine the voltage input direction of the bidirectional resonance unit, and input a DC pulse voltage to the first FM generating unit or input a DC pulse voltage to the second FM generating unit according to the voltage input direction.

As an optional embodiment, the resonance device further includes: a voltage sampling and error amplification unit, the voltage sampling and error amplification unit is connected to the FM controller and the first load or the third load,

The FM control unit is also used to:

generating a reference voltage, and delivering the reference voltage to the voltage sampling and error amplification unit;

The voltage sampling and error amplification unit is used for:

Acquire the DC voltage output by the first load or the third load, and compare it with the reference voltage to obtain a first error amplification value, and transmit the first error amplification value to the FM control unit ;

The FM control unit is also used to:

Adjust the frequency of the DC voltage output by the FM according to the first error amplification value.

Specifically, the FM control unit is generally a digital signal processing (digital signal processing, DSP) control chip or other analog control chips, responsible for receiving the Pi signal from the voltage sampling and error amplification unit. When outputting in the forward direction, the FM control unit can send a positive FM control signal to the first FM generating unit, and drive the forward MOSFET to generate FM pulse waves; when outputting in the reverse direction, the FM control unit can send the signal to the second FM generating unit Send in the reverse FM control signal to drive the reverse MOSFET to generate FM pulse wave. Therefore, the FM control unit can make the system output a set voltage by adjusting the reference voltage of the error amplifier unit.

Fig. 11 shows a control block diagram of another resonant device 1100 provided by the embodiment of the present application. The resonant device 1100 includes: a bidirectional resonant unit 110, an isolation transformer 120, a first FM generating unit 1102, a first rectifying unit 1103, a second FM generation unit 1104 , second rectification unit 1105 , FM control unit 1106 , forward output voltage sampling and error amplification unit 1107 , reverse output voltage sampling and error amplification unit 1108 .

In FIG. 11 , the FM control unit 1106 first determines whether it is a forward output or a reverse output. After the FM control unit 1106 determines that it is a forward working mode, the FM control unit 1106 will output a forward FM control signal to the first FM generation unit 1102 , the first FM generating unit 1102 converts the input forward DC voltage into an FM pulse voltage, and inputs it to the bidirectional resonant unit 110, and the bidirectional resonant unit 110 outputs an AC voltage through the isolation transformer 120, and the AC voltage enters the first rectifying unit 1103 Inside, it becomes a DC voltage output. The output voltage can be sent to the forward output voltage sampling and error amplification unit 1107, compared with the forward reference voltage generated by the FM control unit 1106, and then a forward Pi value is output by the forward output voltage sampling and error amplification unit 1107 Received by the FM control unit 1106, the FM control unit 1106 adjusts the frequency of the FM control signal according to the value of Pi, thereby adjusting the frequency of the FM pulse voltage that the first FM generation unit 1102 inputs to the two-way resonance unit 110, and the two-way resonance unit 110 according to different The input FM pulse voltage frequency presents different impedances, thereby adjusting the output voltage. This adjustment process continues until the positive sampled voltage signal is consistent with the set reference voltage and reaches equilibrium.

It should be understood that the reverse working mode is similar to the forward working mode, which will not be repeated here.

Fig. 12 shows a control block diagram of another resonant device 1200 provided by the embodiment of the present application. The resonant device 1200 includes: a bidirectional resonant unit 110, a multi-winding transformer 130, a first FM generating unit 1102, a first rectifying unit 1103, a second The second FM generation unit 1104 , the second rectification unit 1105 and the third rectification unit 1110 .

Specifically, one more winding can be added to the isolation transformer, that is, the above-mentioned isolation transformer is specifically a multi-winding transformer 130 , and the multi-winding transformer 130 is placed in front of the bidirectional bidirectional resonant unit 110 . When the positive FM voltage pulse is input to the isolation transformer 130, a fixed voltage can be obtained at the auxiliary source winding by fixing the transformation ratio n (n is less than 1), and when the FM voltage pulse is input in the reverse direction, only the reverse When the output voltage is basically the same as the forward input voltage, the auxiliary source winding can also get a fixed voltage. Moreover, since this voltage is obtained only through the multi-winding transformer 130 and not through the bidirectional resonant unit 110 , it is not affected by frequency changes, but only affected by the transformation ratio of the multi-winding transformer 130 and the magnitude of the input voltage. In this way, no matter how the FM frequency changes in forward and reverse directions, as long as the input voltage of the multi-winding transformer 130 is consistent, a fixed auxiliary source voltage can be obtained, which is very suitable for applications with this requirement.

Therefore, in the resonant device of the embodiment of the present application, after the auxiliary winding is added to the isolation transformer, the design of the auxiliary power supply can be omitted, which saves costs.

It should be understood that the resonant device in the embodiment of the present application may be applied in a single-phase or multi-phase parallel, series or other connection circuit topology, which is not limited in the embodiment of the present application. In a possible implementation, the parallel connection of the input and the parallel connection of the output is adopted, as shown in FIG. 13 , to realize two-phase output and double the output power.

Those skilled in the art can appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present application.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.

If the functions described above are realized in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disk or optical disk and other various media that can store program codes. .

The above is only a specific implementation of the application, but the scope of protection of the application is not limited thereto. Anyone familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the application. Should be covered within the protection scope of this application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims (9)

1. A resonance device, characterized in that, comprising: A bidirectional resonant unit, the first end of the bidirectional resonant unit is connected to the positive pole of the positive input voltage source of the resonant device, and the second end of the bidirectional resonant unit is connected to the negative pole of the positive input voltage source, so The third end of the bidirectional resonance unit is connected to the first end of the first load, the fourth end of the bidirectional resonance unit is connected to the second end of the first load, Or the first end of the bidirectional resonant unit is connected to the first end of the first load, the second end of the bidirectional resonant unit is connected to the second end of the first load, and the second end of the bidirectional resonant unit The three terminals are connected to the positive pole of the reverse input voltage source of the resonance device, and the fourth terminal of the bidirectional resonance unit is connected to the negative pole of the reverse input voltage source; The bidirectional resonant unit includes: a series circuit, the series circuit includes a first capacitor (101) and a first inductor (102) connected in series with the first capacitor, the first end of the series circuit is connected to the bidirectional The first end of the resonance unit is connected, and the second end of the series circuit is connected to the third end of the bidirectional resonance unit; The bidirectional resonance unit also includes: A second inductance (103), the first end of the second inductance is connected to the first end of the bidirectional resonant unit, and the second end of the second inductance is connected to the second end of the bidirectional resonant unit; A third inductor (104), the first terminal of the third inductor is connected to the third terminal of the bidirectional resonance unit, and the second terminal of the third inductor is connected to the fourth terminal of the bidirectional resonance unit. 2. The resonant device according to claim 1, wherein the bidirectional resonant unit further comprises: A second capacitor (105), the first end of the second capacitor is connected to the second end of the second inductance, and the second end of the second inductance is connected to the bidirectional resonant unit through the second capacitor The second end is connected. 3. The resonant device according to claim 1 or 2, wherein the bidirectional resonant unit further comprises: A third capacitor (106), the first end of the third capacitor is connected to the second end of the third inductance, the second end of the third inductance is connected to the bidirectional resonant unit through the third capacitor The fourth terminal is connected. 4. The resonant device according to any one of claims 1 to 3, wherein the resonant device further comprises: An isolation transformer, the first terminal and the second terminal of the isolation transformer are respectively connected to the positive pole and the negative pole of the positive input voltage source, and the third terminal and the fourth terminal of the isolation transformer are respectively connected to the bidirectional resonance unit The first end is connected to the second end, The isolation transformer is used for: The DC voltage of the positive input voltage source is converted into an AC voltage and output to the bidirectional resonance unit. 5. The resonant device according to claim 4, wherein the isolation transformer is a multi-winding transformer, and the isolation transformer further comprises: a fifth terminal and a sixth terminal, the fifth terminal and the sixth terminal of the isolation transformer The six terminals are respectively connected to the first terminal and the second terminal of the second load; The isolation transformer is also used for: Converting the DC voltage of the positive input voltage source into an AC voltage and outputting it to the second load. 6. The resonant device according to claim 4 or 5, wherein the resonant device further comprises: A first frequency modulation FM generating unit and a first rectifying unit, wherein the first end and the second end of the first FM generating unit are respectively connected to the positive pole and the negative pole of the positive input voltage source, and the first FM The third terminal and the fourth terminal of the generating unit are respectively connected to the first terminal and the second terminal of the isolation transformer, and the third terminal and the fourth terminal of the bidirectional resonance unit are respectively connected to the first terminal of the first rectifying unit. connected to the second terminal, the third terminal and the fourth terminal of the first rectifier unit are respectively connected to the first terminal and the second terminal of the first load, The first FM generating unit is used for: converting the DC voltage of the positive input voltage source into a DC pulse voltage, and outputting it to the isolation transformer; The first rectifying unit is used for: The AC voltage output by the bidirectional resonance unit is converted into a DC voltage and output to the first load. 7. The resonant device according to claim 6, wherein the resonant device further comprises: A second FM generating unit and a second rectifying unit, wherein the third end and the fourth end of the second FM generating unit are respectively connected to the positive pole and the negative pole of the reverse input voltage source, and the second FM generating unit The first terminal and the second terminal of the two-way resonant unit are respectively connected to the third terminal and the fourth terminal, and the first terminal and the second terminal of the isolation transformer are respectively connected to the third terminal and the fourth terminal of the second rectifying unit. The fourth terminal is connected, the first terminal and the second terminal of the second rectifying unit are respectively connected to the first terminal and the second terminal of the third load, The second FM generating unit is used for: converting the DC voltage of the reverse input voltage source into a DC pulse voltage, and outputting it to the bidirectional resonance unit; The isolation transformer is also used for: converting the DC pulse voltage output by the bidirectional resonance unit into an AC voltage, and outputting it to the second rectification unit; The second rectification unit is used for: The AC voltage output by the isolation transformer is converted into a DC voltage, and output to the third load. 8. The resonant device according to claim 7, wherein the resonant device further comprises: an FM control unit, the FM control unit is connected to the first FM generating unit and the second FM generating unit, The FM control unit is used for: Determine the voltage input direction of the bidirectional resonance unit, and input a DC pulse voltage to the first FM generating unit or input a DC pulse voltage to the second FM generating unit according to the voltage input direction. 9. The resonant device according to any one of claims 1 to 8, wherein at least one of the first inductance, the second inductance and the third inductance is a single magnetic inductance or a magnetically integrated way inductance.