CN219145262U - Bidirectional power supply - Google Patents
Bidirectional power supply Download PDFInfo
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- CN219145262U CN219145262U CN202222192765.2U CN202222192765U CN219145262U CN 219145262 U CN219145262 U CN 219145262U CN 202222192765 U CN202222192765 U CN 202222192765U CN 219145262 U CN219145262 U CN 219145262U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model discloses a bidirectional power supply, which comprises: the first power switch tube and the first main control IC; the second power switch tube and the second main control IC; and an isolated commutation apparatus, the isolated commutation apparatus comprising: an optical coupler; the device comprises a primary circuit of an optical coupler transmitting end, a first power supply end, a third power supply end, a reversing control end, a first grounding end and a first output end; the secondary circuit of the optical coupler receiving end, the second power supply end, the second grounding end and the second output end; the isolated commutation apparatus is configured to: when the primary side of the bidirectional power supply is used as an input end and the secondary side is used as an output end, the reversing control end is suspended, the optocoupler is turned off, the first voltage is larger than the first undervoltage protection threshold value, and the second voltage is smaller than or equal to the second undervoltage protection threshold value; when the primary side of the bidirectional power supply is used as an output end and the secondary side is used as an input end, the commutation control end is set to 0, the optocoupler is conducted, the first voltage is less than or equal to a first undervoltage protection threshold value, and the second voltage is more than a second undervoltage protection threshold value. The utility model realizes the high pressure-resistant isolation of the primary side and the secondary side.
Description
Technical Field
The utility model relates to the technical field of switching power supplies, in particular to a bidirectional power supply.
Background
The bidirectional power supply is a power supply capable of realizing bidirectional transmission of energy, namely, allowing electric energy to be transmitted from a primary side to a secondary side, and also allowing electric energy to be transmitted from the secondary side to the primary side, and is functionally equivalent to two unidirectional direct current power supplies, each direct current power supply comprises a power switching tube, the power switching tube is constantly turned on and off through a main control IC, and the power switching tube is used for carrying out pulse modulation on input voltage, so that voltage conversion is realized, and output voltage is adjustable and automatic voltage stabilization is realized.
The bidirectional power supply has very wide application in occasions such as uninterrupted power supply, charge and discharge of storage batteries, energy recovery systems of electric automobiles and high-power equipment, standby power supply of the high-power equipment and the like. Most of the prior bidirectional power supplies adopt a main control IC to drive a primary side power switch tube and a secondary side power switch tube at the same time, so that the primary side and the secondary side are electrically connected, and the withstand voltage is low.
Disclosure of Invention
In view of the above, the present utility model aims to provide a dual-repair yard, in which the primary side and the secondary side are separately driven, and which has high voltage-withstanding characteristics.
In order to solve the above technical problems, an embodiment of the bidirectional power supply provided by the present utility model is as follows:
a bi-directional power supply, comprising: the primary side comprises a first power switch tube and a first main control IC, wherein the first main control IC stops working when the voltage of an undervoltage protection port of the first main control IC is less than or equal to a first undervoltage protection threshold value; the second power switch tube and the second main control IC at the secondary side stop working when the voltage of the undervoltage protection port of the second main control IC is less than or equal to a second undervoltage protection threshold value; and an isolated commutation apparatus, the isolated commutation apparatus comprising:
an optical coupler; the primary circuit, the first power supply end, the third power supply end, the reversing control end, the first grounding end and the first output end are positioned at the transmitting end of the optocoupler; the secondary circuit, the second power supply end, the second grounding end and the second output end are positioned at the receiving end of the optocoupler;
the first power supply end is connected with a 1 pin of the optocoupler and is used for inputting a first power supply voltage; the third power supply end is used for inputting a third power supply voltage; the reversing control end is coupled with the 2 pins of the optical coupler and is used for inputting a reversing instruction representing the input end and the output end of the bidirectional power supply; the first grounding end is used for being connected with a primary side ground; the first output end outputs a first voltage and is connected to an undervoltage protection port of the first main control IC; the second power supply end is connected with the 4 pins of the optocoupler and is used for inputting a second power supply voltage; the second grounding end is coupled with the 3 pin of the optical coupler and is used for connecting with the secondary side ground; the second output end outputs a second voltage and is connected with an undervoltage protection port of the second main control IC;
wherein, the working mode of the isolating reversing device is configured as follows: when the primary side of the bidirectional power supply is used as an input end and the secondary side is used as an output end, the reversing control end is suspended, the optocoupler is turned off, the first voltage is larger than the first undervoltage protection threshold value, and the second voltage is smaller than or equal to the second undervoltage protection threshold value; when the primary side of the bidirectional power supply is used as an output end and the secondary side is used as an input end, the commutation control end is set to 0, the optocoupler is conducted, the first voltage is less than or equal to the first undervoltage protection threshold value, and the second voltage is more than the second undervoltage protection threshold value.
Further, the third power supply end and the first power supply end are multiplexed, or the third power supply end is connected to a bus of the primary side to take power.
As a specific implementation mode of the primary side circuit, the switching-on/switching-off device comprises a first voltage dividing circuit and a diode, wherein the input end of the first voltage dividing circuit is the third power supply end, a first voltage dividing node of the first voltage dividing circuit is connected with the anode of the diode, a second voltage dividing node of the first voltage dividing circuit is the first output end, the output end of the first voltage dividing circuit is the first grounding end, and the anode of the diode is connected with the reversing control end.
As a specific implementation mode of the first voltage dividing circuit, the circuit comprises a resistor R2, a resistor R3 and a resistor R4, wherein one end of the resistor R2 is an input end of the first voltage dividing circuit, the other end of the resistor R2 and one end of the resistor R3 are connected together and then are first voltage dividing nodes of the first voltage dividing circuit, the other end of the resistor R3 and one end of the resistor R4 are connected together and then are second voltage dividing nodes of the first voltage dividing circuit, and the other end of the resistor R4 is an output end of the first voltage dividing circuit.
Further, the primary circuit further comprises a resistor R1, one end of the resistor R1 is connected with the 2 pin of the optocoupler, and the other end of the resistor R1 is connected with the reversing control end.
As a specific implementation mode of the secondary side circuit, the circuit comprises a second voltage dividing circuit, wherein the input end of the second voltage dividing circuit is connected with the 3 pin of the optical coupler, and the voltage dividing node of the second voltage dividing circuit is the second output end.
As a specific implementation mode of the second voltage dividing circuit, the circuit comprises a resistor R5 and a resistor R6, wherein one end of the resistor R5 is an input end of the second voltage dividing circuit, the other end of the resistor R5 and one end of the resistor R6 are connected together to form a voltage dividing node of the second voltage dividing circuit, and the other end of the resistor R6 is an output end of the second voltage dividing circuit.
A bi-directional power supply, comprising: the primary side comprises a first power switch tube and a first main control IC, wherein the first main control IC stops working when the voltage of an undervoltage protection port of the first main control IC is less than or equal to a first undervoltage protection threshold value; the second power switch tube and the second main control IC at the secondary side stop working when the voltage of the undervoltage protection port of the second main control IC is less than or equal to a second undervoltage protection threshold value; and an isolated commutation apparatus, the isolated commutation apparatus comprising:
an optical coupler; the primary circuit, the first power supply end, the third power supply end, the reversing control end, the first grounding end and the first output end are positioned at the transmitting end of the optocoupler; the secondary circuit, the second power supply end, the second grounding end and the second output end are positioned at the receiving end of the optocoupler;
the first power supply end is connected with a 1 pin of the optocoupler and is used for inputting a first power supply voltage; the third power supply end is used for inputting a third power supply voltage; the reversing control end is coupled with the 2 pins of the optical coupler and is used for inputting a reversing instruction representing the input end and the output end of the bidirectional power supply; the first grounding end is used for being connected with a primary side ground; the first output end outputs a first voltage and is connected to an undervoltage protection port of the first main control IC; the second power supply end is connected with the 4 pins of the optocoupler and is used for inputting a second power supply voltage; the second grounding end is coupled with the 3 pin of the optical coupler and is used for connecting with the secondary side ground; the second output end outputs a second voltage and is connected with an undervoltage protection port of the second main control IC;
the primary circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a diode, wherein one end of the resistor R2 is connected with the third power supply end, the other end of the resistor R2 is connected with one end of the resistor R3 and then connected with the anode of the diode, the other end of the resistor R3 and one end of the resistor R4 are commonly connected with the first output end, the other end of the resistor R4 is connected with the first grounding end, one end of the resistor R1 is connected with the 2 pin of the optocoupler, and the other end of the resistor R1 is simultaneously connected with the cathode of the diode and the reversing control end;
the secondary side circuit comprises a resistor R5 and a resistor R6, one end of the resistor R5 is connected with the 3 pin of the optocoupler, the other end of the resistor R5 and one end of the resistor R6 are simultaneously connected with the second output end, and the other end of the resistor R6 is connected with the second grounding end;
wherein, the working mode of the isolating reversing device is configured as follows: when the primary side of the bidirectional power supply is used as an input end and the secondary side is used as an output end, the reversing control end is suspended, the optocoupler is turned off, the first voltage is larger than the first undervoltage protection threshold value, and the second voltage is smaller than or equal to the second undervoltage protection threshold value; when the primary side of the bidirectional power supply is used as an output end and the secondary side is used as an input end, the commutation control end is set to 0, the optocoupler is conducted, the first voltage is less than or equal to the first undervoltage protection threshold value, and the second voltage is more than the second undervoltage protection threshold value.
Term interpretation:
1 pin of optocoupler: the anode of the emitting end is connected with the anode of the light emitting diode in the optocoupler;
2 feet of optocoupler: a cathode representing an emitting end and connected with a cathode of the light emitting diode in the optocoupler;
3 feet of optocoupler: e pole of the receiving end is connected with emitter of phototriode in the optical coupler;
4 feet of the optocoupler: the C pole representing the receiving end is connected with the collector electrode of the phototriode in the optocoupler;
the optocoupler is turned off: the phototriode in the optocoupler is turned off due to the cut-off of the light emitting diode;
and (3) optical coupling conduction: the phototriode in the optocoupler is conducted due to the conduction of the light emitting diode;
UVP pins of master IC: representing an undervoltage protection port of the main control chip, and stopping the operation of the main control IC when the voltage of the undervoltage protection port is less than or equal to an undervoltage protection threshold;
commutation control terminal CTRL: the device comprises a port, a primary side and a secondary side, wherein the port is used for inputting a command representing reversing of an input end and an output end of a bidirectional power supply; when the port is set to 0, the secondary side of the bi-directional power supply is the input end and one side is the output end.
The working principle of the bidirectional power supply according to the embodiment of the present utility model will be analyzed in detail in combination with specific embodiments, and will not be described in detail herein. The embodiment of the utility model has the beneficial effects that:
(1) The added isolation reversing device realizes isolation driving when the bidirectional power supply works by controlling the undervoltage protection ports of the first main control IC and the second main control IC, and improves the voltage resistance of the bidirectional power supply;
(2) The optocoupler in the isolation reversing device belongs to a low-current device, the current flowing through the undervoltage protection ports of the first main control IC and the second main control IC is smaller, and the two main control ICs can be controlled without adding other switching devices, so that the circuit structure of the isolation reversing device is simple and the cost is low.
Drawings
FIG. 1 is a block diagram of a bi-directional power supply of the present utility model without the addition of an isolated commutation device;
FIG. 2 is a circuit diagram of one embodiment of an enhanced isolated commutation apparatus of the present utility model;
fig. 3 is a circuit diagram of the bi-directional power supply of fig. 1 with the addition of the isolated commutation apparatus of fig. 2.
Detailed Description
The present utility model will be described in detail below with reference to the embodiments and the accompanying drawings to help those skilled in the art to better understand the practical concept of the present utility model, but the scope of the claims of the present utility model is not limited to the following embodiments, and it is intended that those skilled in the art will not make any other embodiments obtained by inventive work without departing from the inventive concept of the present utility model.
It should be noted that the terms "comprising" and "having," and any variations thereof, as described in the specification and claims of this application are intended to cover a non-exclusive inclusion, such as an inclusion of a list of elements, unit circuits, or control sequences that are not necessarily limited to those elements, unit circuits, or control sequences explicitly listed, but may include elements, unit circuits, or control sequences not explicitly listed or inherent to such circuits.
In addition, embodiments and features of embodiments in this application may be combined with each other without conflict.
It will be understood that, in the description and in the claims, when an element is described as being "connected/coupled" to another element, the element may be "directly connected" to the other element or "connected" to the other element through a third element; when it is described that a step is continued to another step, the step may be continued directly to the another step or through a third step to the another step.
Before describing the bidirectional power supply of the present utility model, a description is first given of a structure diagram in which an isolation reversing device is added, fig. 1 is a structure diagram of the bidirectional power supply of the present utility model when the isolation reversing device is not added, please refer to fig. 1, a primary side of the bidirectional power supply includes a first power switch tube 103 and a first master IC102, and the first master IC102 stops working when the voltage of an under-voltage protection port UVP1 thereof is less than or equal to a first under-voltage protection threshold; the secondary side of the bidirectional power supply comprises a second power switch tube 108 and a second main control IC109, and the second main control IC109 stops working when the voltage of an undervoltage protection port UVP2 of the second main control IC is less than or equal to a second undervoltage protection threshold value.
Further, the primary side Vin terminal, the primary side battery system 101, the secondary side Vo terminal, the secondary side battery system 110, the transformer 106, the first freewheel power tube 104, the second freewheel power tube 107, the first auxiliary power source 105, and the second auxiliary power source 111 are included therein.
Wherein, the primary side Vin end is connected with the primary side battery system 101, and the secondary side Vo end is connected with the secondary side battery system 110; the enabling control end is connected with the first auxiliary power supply 105, the first auxiliary power supply 105 is connected with the first main control IC102, and the first auxiliary power supply can provide a first auxiliary voltage for the first main control IC102 when a signal of the enabling control end is effective; the second auxiliary power supply 111 is connected to the second main control IC109, and provides a second auxiliary voltage to the second main control IC 109.
Fig. 2 is a circuit diagram of an added isolated commutation apparatus according to an embodiment of the present utility model, please refer to fig. 2, which includes: an optical coupler; the primary circuit, the first power supply end VCC1, the third power supply end VCC3, the reversing control end CTRL, the first grounding end GND1 and the first output end OUT1 are positioned at the transmitting end of the optocoupler; the secondary circuit, the second power supply end VCC2, the second grounding end GND2 and the second output end OUT2 are positioned at the receiving end of the optocoupler; the first power supply end VCC1 is connected with the 1 pin of the optocoupler and is used for inputting a first power supply voltage; the third power supply terminal VCC3 is used for inputting a third power supply voltage; the reversing control end CTRL is coupled with the 2 pins of the optocoupler and is used for inputting a reversing instruction representing the input end and the output end of the bidirectional power supply; the first grounding end GND1 is used for connecting a primary side ground; the first output end OUT1 outputs a first voltage and is used for being connected to an undervoltage protection port UVP1 of the first main control IC; the second power supply end VCC2 is connected with the 4 pin of the optocoupler and is used for inputting a second power supply voltage; the second grounding end GND2 is coupled with the 3 pin of the optical coupler and is used for connecting with the secondary side ground; the second output end OUT2 outputs a second voltage and is used for being connected with an undervoltage protection port UVP2 of the second main control IC.
Wherein the isolated commutation apparatus is configured to operate in conjunction with the bi-directional power supply of fig. 1 in the following manner: when the primary side of the bidirectional power supply is used as an input end and the secondary side is used as an output end, the reversing control end CTRL is suspended, the optocoupler is turned off, the first voltage is larger than a first undervoltage protection threshold value, and the second voltage is smaller than or equal to a second undervoltage protection threshold value; when the primary side of the bidirectional power supply is used as an output end and the secondary side is used as an input end, the reversing control end CTRL is set to 0, the optocoupler is conducted, the first voltage is less than or equal to a first undervoltage protection threshold value, and the second voltage is more than a second undervoltage protection threshold value.
Further, the third power supply terminal VCC3 and the first power supply terminal VCC1 are multiplexed, or the third power supply terminal VCC3 is used for connecting to the bus bar of the primary side to take power, i.e. the third power supply terminal VCC3 is used for connecting to the Vin end of the primary side.
The isolation reversing device realizes isolation driving when the bidirectional power supply works by controlling the under-voltage protection ports of the first main control IC and the second main control IC, and improves the voltage resistance of the bidirectional power supply; and the optocoupler in the isolation reversing device belongs to a low-current device, the current flowing through the undervoltage protection ports of the first main control IC and the second main control IC is smaller, and the two main control ICs can be controlled without adding other switching devices, so that the circuit structure of the isolation reversing device is simple and the cost is low.
The following describes a specific implementation manner of the primary side circuit and the secondary side circuit in the isolated commutation device:
the primary circuit comprises a first voltage dividing circuit and a diode, the input end of the first voltage dividing circuit is the third power supply end VCC3, a first voltage dividing node of the first voltage dividing circuit is connected with the anode of the diode, a second voltage dividing node of the first voltage dividing circuit is a first output end OUT1, the output end of the first voltage dividing circuit is a first grounding end GND1, and the anode of the diode is connected with a reversing control end CTRL.
Further, the first voltage dividing circuit comprises a resistor R2, a resistor R3 and a resistor R4, one end of the resistor R2 is an input end of the first voltage dividing circuit, the other end of the resistor R2 is connected with one end of the resistor R3 to form a first voltage dividing node of the first voltage dividing circuit, the other end of the resistor R3 is connected with one end of the resistor R4 to form a second voltage dividing node of the first voltage dividing circuit, and the other end of the resistor R4 is an output end of the first voltage dividing circuit.
It should be noted that, the purpose of setting two voltage dividing/resistors R2 is to limit current, so as to avoid short circuit caused by the fact that the third power supply terminal VCC3 is directly connected with the 0 signal through the diode when the commutation control terminal is set to 0.
Further, the primary circuit further includes a resistor R1 for limiting current, so as to prevent the first power supply terminal VCC1 from being directly grounded through the light emitting diode when the commutation control terminal is set to 0, resulting in a short circuit, one end of the resistor R1 is connected to the 2 pin of the optocoupler, and the other end of the resistor R1 is connected to the commutation control terminal CTRL.
The secondary side circuit comprises a second voltage dividing circuit, an input end of the second voltage dividing circuit is connected with a 3 pin of the optical coupler, and a voltage dividing node of the second voltage dividing circuit is a second output end OUT2.
The second voltage dividing circuit comprises a resistor R5 and a resistor R6, one end of the resistor R5 is an input end of the second voltage dividing circuit, the other end of the resistor R5 is connected with one end of the resistor R6 to form a voltage dividing node of the second voltage dividing circuit, and the other end of the resistor R6 is an output end of the second voltage dividing circuit.
Various specific implementations of the primary side circuit and the secondary side circuit can also form a better circuit structure through equivalent replacement, addition or reduction of auxiliary parts.
The preferred implementation mode of the internal circuit of the isolated commutation device of the utility model is as follows: the primary circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a diode, wherein one end of the resistor R2 is connected with a third power supply end VCC3, the other end of the resistor R2 is connected with one end of the resistor R3 and then is connected with the anode of the diode, the other end of the resistor R3 and one end of the resistor R4 are jointly connected with a first output end OUT1, the other end of the resistor R4 is connected with a first grounding end GND1, one end of the resistor R1 is connected with a 2 pin of an optocoupler, and the other end of the resistor R1 is simultaneously connected with the cathode of the diode and a reversing control end CTRL; the secondary circuit comprises a resistor R5 and a resistor R6, one end of the resistor R5 is connected with the 3 pin of the optocoupler, the other end of the resistor R5 and one end of the resistor R6 are simultaneously connected with the second output end OUT2, and the other end of the resistor R6 is connected with the second grounding end GND2.
Fig. 3 is a circuit diagram of the bidirectional power supply shown in fig. 1 with the isolated commutation device shown in fig. 2 added, please refer to fig. 3, wherein the bidirectional power supply includes: the primary side comprises a first power switch tube and a first main control IC, wherein the first main control IC stops working when the voltage of an undervoltage protection port of the first main control IC is less than or equal to a first undervoltage protection threshold value; the second power switch tube and the second main control IC at the secondary side stop working when the voltage of the undervoltage protection port of the second main control IC is less than or equal to a second undervoltage protection threshold value; and an isolated commutation device 113 comprising:
an optical coupler; the primary circuit, the first power supply end VCC1, the third power supply end VCC3, the reversing control end CTRL, the first grounding end GND1 and the first output end OUT1 are positioned at the transmitting end of the optocoupler; the secondary circuit, the second power supply end VCC2, the second grounding end GND2 and the second output end OUT2 are positioned at the receiving end of the optocoupler;
the first power supply end VCC1 is connected with the 1 pin of the optocoupler and is used for inputting a first power supply voltage; the third power supply terminal VCC3 is used for inputting a third power supply voltage; the reversing control end CTRL is coupled with the 2 pins of the optocoupler and is used for inputting a reversing instruction representing the input end and the output end of the bidirectional power supply; the first grounding end GND1 is used for connecting a primary side ground; the first output end OUT1 outputs a first voltage and is connected to an undervoltage protection port UVP1 of the first main control IC; the second power supply end VCC2 is connected with the 4 pin of the optocoupler and is used for inputting a second power supply voltage; the second grounding end GND2 is coupled with the 3 pin of the optical coupler and is used for connecting with the secondary side ground; the second output end OUT2 outputs a second voltage and is connected with an undervoltage protection port UVP2 of the second main control IC;
wherein, the working mode of the isolating reversing device is configured as follows: when the primary side of the bidirectional power supply is used as an input end and the secondary side is used as an output end, the reversing control end CTRL is suspended, the optocoupler is turned off, the first voltage is larger than a first undervoltage protection threshold value, and the second voltage is smaller than or equal to a second undervoltage protection threshold value; when the primary side of the bidirectional power supply is used as an output end and the secondary side is used as an input end, the reversing control end CTRL is set to 0, the optocoupler is conducted, the first voltage is less than or equal to a first undervoltage protection threshold value, and the second voltage is more than a second undervoltage protection threshold value.
Further, the third power supply terminal VCC3 and the first power supply terminal VCC2 are multiplexed, or the third power supply terminal VCC3 is connected to the bus bar of the primary side to take power.
As a specific implementation mode of the primary side circuit, the circuit comprises a first voltage dividing circuit and a diode, wherein the input end of the first voltage dividing circuit is a third power supply end VCC3, a first voltage dividing node of the first voltage dividing circuit is connected with the anode of the diode, a second voltage dividing node of the first voltage dividing circuit is a first output end OUT1, the output end of the first voltage dividing circuit is a first grounding end GND1, and the anode of the diode is connected with a reversing control end CTRL.
As a specific implementation mode of the first voltage dividing circuit, the circuit comprises a resistor R2, a resistor R3 and a resistor R4, wherein one end of the resistor R2 is an input end of the first voltage dividing circuit, the other end of the resistor R2 is connected with one end of the resistor R3 to form a first voltage dividing node of the first voltage dividing circuit, the other end of the resistor R3 is connected with one end of the resistor R4 to form a second voltage dividing node of the first voltage dividing circuit, and the other end of the resistor R4 is an output end of the first voltage dividing circuit.
Further, the primary circuit further comprises a resistor R1, one end of the resistor R1 is connected with the 2 pin of the optocoupler, and the other end of the resistor R1 is connected with the reversing control end CTRL.
As a specific implementation mode of the secondary side circuit, the secondary side circuit comprises a second voltage division circuit, the input end of the second voltage division circuit is connected with the 3 pin of the optical coupler, and the voltage division node of the second voltage division circuit is a second output end OUT2.
Further, the second voltage dividing circuit comprises a resistor R5 and a resistor R6, one end of the resistor R5 is an input end of the second voltage dividing circuit, the other end of the resistor R5 and one end of the resistor R6 are connected together to form a voltage dividing node of the second voltage dividing circuit, and the other end of the resistor R6 is an output end of the second voltage dividing circuit.
One specific embodiment as a bi-directional power supply includes: the primary side comprises a first power switch tube and a first main control IC, wherein the first main control IC stops working when the voltage of an undervoltage protection port of the first main control IC is less than or equal to a first undervoltage protection threshold value; the second power switch tube and the second main control IC at the secondary side stop working when the voltage of the undervoltage protection port of the second main control IC is less than or equal to a second undervoltage protection threshold value; and an isolated commutation apparatus, the isolated commutation apparatus comprising:
an optical coupler; the primary circuit, the first power supply end VCC1, the third power supply end VCC3, the reversing control end CTRL, the first grounding end GND1 and the first output end OUT1 are positioned at the transmitting end of the optocoupler; the secondary circuit, the second power supply end VCC2, the second grounding end GND2 and the second output end OUT2 are positioned at the receiving end of the optocoupler;
the first power supply end VCC1 is connected with the 1 pin of the optocoupler and is used for inputting a first power supply voltage; the third power supply terminal VCC3 is used for inputting a third power supply voltage; the reversing control end CTRL is coupled with the 2 pins of the optocoupler and is used for inputting a reversing instruction representing the input end and the output end of the bidirectional power supply; the first grounding end GND1 is used for connecting a primary side ground; the first output end OUT1 outputs a first voltage and is connected to an undervoltage protection port UVP1 of the first main control IC; the second power supply end VCC2 is connected with the 4 pin of the optocoupler and is used for inputting a second power supply voltage; the second grounding end GND2 is coupled with the 3 pin of the optical coupler and is used for connecting with the secondary side ground; the second output end OUT2 outputs a second voltage and is connected with an undervoltage protection port UVP2 of the second main control IC;
the primary circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a diode, wherein one end of the resistor R2 is connected with a third power supply end VCC3, the other end of the resistor R2 is connected with one end of the resistor R3 and then is connected with the anode of the diode, the other end of the resistor R3 and one end of the resistor R4 are commonly connected with a first output end OUT1, the other end of the resistor R4 is connected with a first grounding end GND1, one end of the resistor R1 is connected with a 2 pin of an optical coupler, and the other end of the resistor R1 is simultaneously connected with the cathode of the diode and a reversing control end CTRL;
the secondary side circuit comprises a resistor R5 and a resistor R6, one end of the resistor R5 is connected with the 3 pin of the optocoupler, the other end of the resistor R5 and one end of the resistor R6 are simultaneously connected with a second output end OUT2, and the other end of the resistor R6 is connected with a second grounding end GND2;
the operation mode of the isolating and reversing device 113 is configured as follows: when the primary side of the bidirectional power supply is used as an input end and the secondary side is used as an output end, the reversing control end is suspended, the optocoupler is turned off, the first voltage is larger than the first undervoltage protection threshold value, and the second voltage is smaller than or equal to the second undervoltage protection threshold value; when the primary side of the bidirectional power supply is used as an output end and the secondary side is used as an input end, the commutation control end is set to 0, the optocoupler is conducted, the first voltage is less than or equal to a first undervoltage protection threshold value, and the second voltage is more than a second undervoltage protection threshold value.
The primary side and the secondary side of the bidirectional power supply are connected through only one transformer and one optocoupler, wherein the primary power circuits of the primary side and the secondary side are isolated through the transformer 106, and the control structures of the primary side and the secondary side are isolated through the optocoupler, so that the bidirectional power supply works bidirectionally, meanwhile, the high voltage-resistant isolation of the primary side and the secondary side is realized, and the higher safety requirement is met.
The working principle of the circuit is analyzed in detail below in conjunction with the circuit of fig. 3 as follows:
when the bidirectional power supply works in the forward direction, the primary side Vin end is used as an input end, the secondary side Vo end is used as an output end, the bidirectional power supply stores energy through the primary side Vin end, the primary side of the transformer 106 and the first power switch tube 103, and then outputs energy through the secondary side of the transformer 106 and the first freewheeling diode 107 to supply power to the secondary side battery system 110, and the secondary side Vo end is used as the output end. In this case, the enabling control end is configured to receive an effective enabling signal, and supply power to the first auxiliary power supply 105, where the first auxiliary power supply 105 supplies power to the first main control IC102, the first auxiliary power supply 105 is further connected to the 1 pin of the optocoupler 113, the commutation control end CTRL is configured to be suspended, the diode in the isolation commutation module 112 is turned off, the light emitting diode in the optocoupler 113 is turned off, the first voltage received by the undervoltage protection port UVP1 of the first main control IC is (Vin/(r2+r3+r4))r4, and by designing a suitable resistance parameter, the first voltage can be made to be greater than the first undervoltage threshold, and the first main control IC works normally. The phototriode in the optocoupler is turned off due to the cut-off of the light emitting diode, the UVP2 of the undervoltage protection port of the second main control IC is pulled down to the ground by the resistor R6, so that the second voltage is smaller than or equal to a second undervoltage threshold value, and the second main control IC enters the undervoltage protection to stop working.
When the bidirectional power supply works reversely, the primary side Vin end is used as an output end, the secondary side Vo end is used as an input end, the bidirectional power supply stores energy through the secondary side Vo end, the secondary side of the transformer 106 and the second power switch tube 108, and then outputs energy through the primary side of the transformer 106 and the second freewheeling diode 104 to supply power to the primary side battery system 101, and the primary side Vin end is used as an output end. The primary Vin end is connected with the battery system, and before the bidirectional power supply works reversely, the voltage is still stored at the primary Vin end. In this case, the enabling control terminal is configured to receive an effective enabling signal, and supply power to the first auxiliary power supply 105, where the first auxiliary power supply 105 supplies power to the first main control IC102, the first auxiliary power supply 105 is further connected to the 1 pin of the optocoupler 113, the commutation control terminal CTRL is configured to set 0 at this time, the energy provided by the third power supply terminal VCC3 flows to the commutation control terminal CTRL through the resistor R2 and the diode, the light emitting diode in the optocoupler is turned on, the voltage of the undervoltage protection port UVP1 of the first main control IC102 is the voltage drop of the diode by the commutation control terminal CTRL, that is, the first voltage is the voltage drop of the diode, and the voltage drop is about 0.7V, where the parameter setting ensures that the voltage is less than or equal to the first undervoltage threshold voltage, and the first main control IC enters the undervoltage protection to stop working. The secondary side Vo end is an input end, a second auxiliary voltage is output through the second auxiliary power supply 111, the second auxiliary voltage supplies power to the second main control IC109, the phototransistor in the optocoupler is turned on due to the conduction of the light emitting diode therein, the second voltage received by the undervoltage protection port UVP2 of the second main control IC is (second auxiliary voltage/(r5+r6))r6, which is greater than the second undervoltage threshold voltage, and the second main control IC works normally.
According to the analysis of the working principle, the bidirectional power supply realizes bidirectional control through the isolation reversing module 112, and realizes isolation driving when the bidirectional power supply works through controlling the under-voltage protection ports of the first main control IC and the second main control IC, so that the voltage resistance of the bidirectional power supply is improved.
It should be noted that the above is only a preferred embodiment of the present utility model, and it should be noted that the above preferred embodiment should not be construed as limiting the present utility model, and it should be recognized that the present utility model is applicable to other broader scope. In light of the foregoing, it will be evident to those skilled in the art that various modifications, substitutions and alterations can be made hereto without departing from the essential spirit of the utility model as defined by the appended claims.
Claims (8)
1. A bi-directional power supply, comprising: the primary side comprises a first power switch tube and a first main control IC, wherein the first main control IC stops working when the voltage of an undervoltage protection port of the first main control IC is less than or equal to a first undervoltage protection threshold value; the second power switch tube and the second main control IC at the secondary side stop working when the voltage of the undervoltage protection port of the second main control IC is less than or equal to a second undervoltage protection threshold value; and an isolated commutation apparatus, the isolated commutation apparatus comprising:
an optical coupler; the primary circuit, the first power supply end, the third power supply end, the reversing control end, the first grounding end and the first output end are positioned at the transmitting end of the optocoupler; the secondary circuit, the second power supply end, the second grounding end and the second output end are positioned at the receiving end of the optocoupler;
the first power supply end is connected with a 1 pin of the optocoupler and is used for inputting a first power supply voltage; the third power supply end is used for inputting a third power supply voltage; the reversing control end is coupled with the 2 pins of the optical coupler and is used for inputting a reversing instruction representing the input end and the output end of the bidirectional power supply; the first grounding end is used for being connected with a primary side ground; the first output end outputs a first voltage and is connected to an undervoltage protection port of the first main control IC; the second power supply end is connected with the 4 pins of the optocoupler and is used for inputting a second power supply voltage; the second grounding end is coupled with the 3 pin of the optical coupler and is used for connecting with the secondary side ground; the second output end outputs a second voltage and is connected with an undervoltage protection port of the second main control IC;
wherein, the working mode of the isolating reversing device is configured as follows: when the primary side of the bidirectional power supply is used as an input end and the secondary side is used as an output end, the reversing control end is suspended, the optocoupler is turned off, the first voltage is larger than the first undervoltage protection threshold value, and the second voltage is smaller than or equal to the second undervoltage protection threshold value; when the primary side of the bidirectional power supply is used as an output end and the secondary side is used as an input end, the commutation control end is set to 0, the optocoupler is conducted, the first voltage is less than or equal to the first undervoltage protection threshold value, and the second voltage is more than the second undervoltage protection threshold value.
2. The bi-directional power supply of claim 1, wherein: the third power supply end and the first power supply end are multiplexed, or the third power supply end is connected to the bus of the primary side to take power.
3. The bi-directional power supply of claim 1, wherein: the primary circuit comprises a first voltage dividing circuit and a diode, the input end of the first voltage dividing circuit is the third power supply end, a first voltage dividing node of the first voltage dividing circuit is connected with the anode of the diode, a second voltage dividing node of the first voltage dividing circuit is the first output end, the output end of the first voltage dividing circuit is the first grounding end, and the anode of the diode is connected with the reversing control end.
4. A bi-directional power supply according to claim 3, characterized in that: the first voltage dividing circuit comprises a resistor R2, a resistor R3 and a resistor R4, wherein one end of the resistor R2 is an input end of the first voltage dividing circuit, the other end of the resistor R2 is connected with one end of the resistor R3 to form a first voltage dividing node of the first voltage dividing circuit, the other end of the resistor R3 is connected with one end of the resistor R4 to form a second voltage dividing node of the first voltage dividing circuit, and the other end of the resistor R4 is an output end of the first voltage dividing circuit.
5. The bi-directional power supply of claim 3 or 4, wherein: the primary circuit further comprises a resistor R1, one end of the resistor R1 is connected with the 2 pin of the optocoupler, and the other end of the resistor R1 is connected with the reversing control end.
6. The bi-directional power supply of claim 1, wherein: the secondary side circuit comprises a second voltage dividing circuit, the input end of the second voltage dividing circuit is connected with the 3 pin of the optocoupler, and the voltage dividing node of the second voltage dividing circuit is the second output end.
7. The bi-directional power supply of claim 6 wherein: the second voltage dividing circuit comprises a resistor R5 and a resistor R6, one end of the resistor R5 is an input end of the second voltage dividing circuit, the other end of the resistor R5 and one end of the resistor R6 are connected together to form a voltage dividing node of the second voltage dividing circuit, and the other end of the resistor R6 is an output end of the second voltage dividing circuit.
8. A bi-directional power supply, comprising: the primary side comprises a first power switch tube and a first main control IC, wherein the first main control IC stops working when the voltage of an undervoltage protection port of the first main control IC is less than or equal to a first undervoltage protection threshold value; the second power switch tube and the second main control IC at the secondary side stop working when the voltage of the undervoltage protection port of the second main control IC is less than or equal to a second undervoltage protection threshold value; and an isolated commutation apparatus, the isolated commutation apparatus comprising:
an optical coupler; the primary circuit, the first power supply end, the third power supply end, the reversing control end, the first grounding end and the first output end are positioned at the transmitting end of the optocoupler; the secondary circuit, the second power supply end, the second grounding end and the second output end are positioned at the receiving end of the optocoupler;
the first power supply end is connected with a 1 pin of the optocoupler and is used for inputting a first power supply voltage; the third power supply end is used for inputting a third power supply voltage; the reversing control end is coupled with the 2 pins of the optical coupler and is used for inputting a reversing instruction representing the input end and the output end of the bidirectional power supply; the first grounding end is used for being connected with a primary side ground; the first output end outputs a first voltage and is connected to an undervoltage protection port of the first main control IC; the second power supply end is connected with the 4 pins of the optocoupler and is used for inputting a second power supply voltage; the second grounding end is coupled with the 3 pin of the optical coupler and is used for connecting with the secondary side ground; the second output end outputs a second voltage and is connected with an undervoltage protection port of the second main control IC;
the primary circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a diode, wherein one end of the resistor R2 is connected with the third power supply end, the other end of the resistor R2 is connected with one end of the resistor R3 and then connected with the anode of the diode, the other end of the resistor R3 and one end of the resistor R4 are commonly connected with the first output end, the other end of the resistor R4 is connected with the first grounding end, one end of the resistor R1 is connected with the 2 pin of the optocoupler, and the other end of the resistor R1 is simultaneously connected with the cathode of the diode and the reversing control end;
the secondary side circuit comprises a resistor R5 and a resistor R6, one end of the resistor R5 is connected with the 3 pin of the optocoupler, the other end of the resistor R5 and one end of the resistor R6 are simultaneously connected with the second output end, and the other end of the resistor R6 is connected with the second grounding end;
wherein, the working mode of the isolating reversing device is configured as follows: when the primary side of the bidirectional power supply is used as an input end and the secondary side is used as an output end, the reversing control end is suspended, the optocoupler is turned off, the first voltage is larger than the first undervoltage protection threshold value, and the second voltage is smaller than or equal to the second undervoltage protection threshold value; when the primary side of the bidirectional power supply is used as an output end and the secondary side is used as an input end, the commutation control end is set to 0, the optocoupler is conducted, the first voltage is less than or equal to the first undervoltage protection threshold value, and the second voltage is more than the second undervoltage protection threshold value.
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| CN202222192765.2U CN219145262U (en) | 2022-08-19 | 2022-08-19 | Bidirectional power supply |
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| CN202222192765.2U CN219145262U (en) | 2022-08-19 | 2022-08-19 | Bidirectional power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116647130A (en) * | 2023-07-20 | 2023-08-25 | 深圳市格睿德电气有限公司 | Auxiliary source power supply circuit and system of bidirectional isolation converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116647130A (en) * | 2023-07-20 | 2023-08-25 | 深圳市格睿德电气有限公司 | Auxiliary source power supply circuit and system of bidirectional isolation converter |
| CN116647130B (en) * | 2023-07-20 | 2024-01-12 | 深圳市格睿德电气有限公司 | Auxiliary source power supply circuit and system of bidirectional isolation converter |
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