CN219554816U - Automatic temperature control step-down driving circuit for secondary side of symmetrical half bridge - Google Patents

Automatic temperature control step-down driving circuit for secondary side of symmetrical half bridge Download PDF

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Publication number
CN219554816U
CN219554816U CN202320335127.3U CN202320335127U CN219554816U CN 219554816 U CN219554816 U CN 219554816U CN 202320335127 U CN202320335127 U CN 202320335127U CN 219554816 U CN219554816 U CN 219554816U
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module
resistor
symmetrical half
bridge
capacitor
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林少芝
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Zhongshan Jinxing Intelligent Technology Co ltd
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Zhongshan Jinxing Intelligent Technology Co ltd
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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 symmetrical half-bridge secondary side temperature control automatic step-down driving circuit which comprises a symmetrical half-bridge module, a transformer module, a voltage division detection module and a control module, wherein the input end of the transformer module is connected with the output end of the symmetrical half-bridge module, a Wen Minzu component is connected with a resistor R3 to form at least part of the voltage division detection module, the resistance value of the Wen Minzu component changes along with the temperature change, the sampling end of the voltage division detection module is connected with the output end of the transformer module, the voltage division detection module forms a feedback signal according to the output voltage of the transformer module, the control module is respectively connected with the output end of the voltage division detection module and the controlled end of the symmetrical half-bridge module, and the control module controls the symmetrical half-bridge module to operate according to the feedback signal so as to adjust the output voltage of the transformer module.

Description

Automatic temperature control step-down driving circuit for secondary side of symmetrical half bridge
Technical Field
The utility model relates to the technical field of power supply driving circuits, in particular to a symmetrical half-bridge secondary side temperature control automatic voltage reduction driving circuit.
Background
The power supply driving circuit adopting the symmetrical half-bridge module is generally used as a high-power switching power supply, and is required to have stable performance and high power density, and in the high-power switching power supply, the regulation of output voltage and the regulation and control of circuit temperature are very important, in the traditional power supply driving circuit, as the power of the symmetrical half-bridge module is larger, the output current is also larger, so that the conditions of large heat productivity and reduced reliability of products can occur, and in the traditional scheme, the complex and high-cost elements are required to be adopted for detecting and feeding back to realize the regulation of the output voltage and the regulation and control of the circuit temperature, thereby leading to higher manufacturing cost and complex circuit.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the symmetrical half-bridge secondary side temperature control automatic voltage reduction driving circuit which is simple in circuit and low in manufacturing cost, can realize the temperature control automatic voltage reduction function and is stable in output.
According to an embodiment of the first aspect of the utility model, a symmetrical half-bridge secondary side temperature control automatic step-down driving circuit comprises: symmetrical half-bridge modules; the input end of the transformer module is connected with the output end of the symmetrical half-bridge module; wen Minzu component and resistor R3, the Wen Minzu component is connected with the resistor R3 to form at least part of partial pressure detection module, the resistance value of the Wen Minzu component changes along with the temperature change, the sampling end of the partial pressure detection module is connected with the output end of the transformer module, and the partial pressure detection module forms a feedback signal according to the output voltage of the transformer module; the control module is respectively connected with the output end of the voltage division detection module and the controlled end of the symmetrical half-bridge module, and controls the symmetrical half-bridge module to operate according to a feedback signal so as to adjust the output voltage of the transformer module.
According to the embodiment of the utility model, the symmetrical half-bridge secondary side temperature control automatic step-down driving circuit has at least the following beneficial effects:
according to the temperature-controlled automatic voltage-reducing driving circuit for the secondary side of the symmetrical half-bridge, the symmetrical half-bridge module modulates a power supply into alternating current and inputs the alternating current to the transformer module, the alternating current is output after being transformed by the transformer module, when the output voltage of the transformer module is too high, the voltage-dividing detection module forms a feedback signal according to the output voltage, the control module can control the symmetrical half-bridge module to operate according to the feedback signal so as to adjust the output voltage of the transformer module, or the environment temperature rises, the resistance of a Wen Minzu component changes along with the change of temperature, and therefore the resistance of the voltage-dividing detection module also changes correspondingly, so that a feedback signal is formed, and the control module can control the symmetrical half-bridge module to operate according to the feedback signal so as to adjust the output voltage of the transformer module.
According to some embodiments of the utility model, the Wen Minzu component comprises a temperature-sensitive resistor RT1, a resistor R1, and a resistor R2, the resistor R2 being connected in parallel with the temperature-sensitive resistor RT1 to form at least a partial resistive parallel branch, the resistive parallel branch being connected in series with the resistor R1.
According to some embodiments of the utility model, the voltage division detection module further includes a voltage stabilizing triode U1, a controlled end of the voltage stabilizing triode U1 is connected with one end of the Wen Minzu component and one end of the resistor R3 respectively, a negative electrode of the voltage stabilizing triode U1 is connected with the control module, and a positive electrode of the voltage stabilizing triode U1 is grounded.
According to some embodiments of the present utility model, the capacitor further comprises a capacitor C1, a capacitor C2, and a resistor R4, wherein one end of the capacitor C1 is connected to one end of the capacitor C2, the controlled end of the zener diode U1, one end of the Wen Minzu component, and one end of the resistor R3, the other end of the capacitor C2 is connected to one end of the resistor R4, and the other end of the resistor R4 is connected to the other end of the capacitor C1, the negative electrode of the zener diode U1, and the control module, respectively.
According to some embodiments of the utility model, the voltage division detection device further comprises an isolation module, wherein an input end of the isolation module is connected with an output end of the voltage division detection module, and an output end of the isolation module is connected with a control module to realize that the control module is connected with the output end of the voltage division detection module.
According to some embodiments of the utility model, the isolation module comprises a photo coupler.
According to some embodiments of the present utility model, the symmetrical half-bridge module includes a switching tube Q1, a switching tube Q2, a capacitor EC2, and a capacitor EC3, where an input end of the switching tube Q1 is connected to one end of the capacitor EC2 to form one pole of an input end of the symmetrical half-bridge module, an output end of the switching tube Q1 is connected to one end of a primary winding of the transformer module and an input end of the switching tube Q2, and another end of the capacitor EC2 is connected to one end of the capacitor EC3 and another end of the primary winding of the transformer module, and an output end of the switching tube Q2 is connected to one end of the capacitor EC3 to form another pole of the input end of the symmetrical half-bridge module.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic block diagram of one embodiment of a symmetrical half-bridge secondary side temperature controlled automatic buck drive circuit of the present utility model;
FIG. 2 is a schematic circuit diagram of a symmetrical half-bridge module;
fig. 3 is a schematic circuit diagram of an embodiment of a symmetrical half-bridge secondary side temperature-controlled automatic step-down driving circuit according to the present utility model.
Reference numerals:
a symmetrical half-bridge module 100; a transformer module 200; a partial pressure detection module 300; wen Minzu sex assembly 400; a control module 500; a rectification module 600; the module 700 is isolated.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.
In the description of the present utility model, it should be understood that references to orientation descriptions such as terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present utility model.
In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1-3, a symmetrical half-bridge secondary side temperature-controlled automatic step-down driving circuit according to an embodiment of the first aspect of the present utility model includes a symmetrical half-bridge module 100, a transformer module 200, a voltage division detecting module 300, and a control module 500, wherein an input end of the transformer module 200 is connected to an output end of the symmetrical half-bridge module 100, a Wen Minzu component 400 is connected to a resistor R3 to form at least a part of the voltage division detecting module 300, a resistance value of the Wen Minzu component 400 changes with a temperature change, a sampling end of the voltage division detecting module 300 is connected to an output end of the transformer module 200, the voltage division detecting module 300 forms a feedback signal according to an output voltage of the transformer module 200, the control module 500 is connected to an output end of the voltage division detecting module 300 and a controlled end of the symmetrical half-bridge module 100, and the control module 500 controls the symmetrical half-bridge module 100 to operate according to the feedback signal to adjust an output voltage of the transformer module 200.
In some embodiments of the present utility model, for example, as shown in fig. 2, the symmetrical half-bridge module 100 includes a switching tube Q1, a switching tube Q2, a capacitor EC2, and a capacitor EC3, an input end of the switching tube Q1 is connected to one end of the capacitor EC2 to form one pole of the input end of the symmetrical half-bridge module 100, an output end of the switching tube Q1 is connected to one end of a primary winding of the transformer module 200 and an input end of the switching tube Q2, and another end of the capacitor EC2 is connected to one end of the capacitor EC3 and another end of the primary winding of the transformer module 200, respectively, and an output end of the switching tube Q2 is connected to one end of the capacitor EC3 to form another pole of the input end of the symmetrical half-bridge module 100.
In addition, for the ac output from the secondary side of the transformer module 200, a rectifying module 600 is generally further provided to rectify and output, specifically, the rectifying module 600 includes a diode D1 and a capacitor EC1, the anode of the diode D1 is connected to one end of the secondary side coil, the cathode of the diode D2 is respectively connected to one end of the capacitor EC1 and the sampling end of the voltage division detection module 300, and the other end of the capacitor EC1 is grounded to the other end of the secondary side coil.
The control module 500 may be a chip with PWM signal modulation and output functions, where the control module 500 modulates different PWM signals according to a feedback signal, and outputs the PWM signals to the controlled end of the switching tube Q1 and the controlled end of the switching tube Q2, and adjusts the output voltage of the voltage transformation module by controlling the on-off frequency of the switching tube Q1 and the switching tube Q2.
According to the symmetrical half-bridge secondary side temperature control automatic step-down driving circuit, the symmetrical half-bridge module 100 modulates a power supply into alternating current and inputs the alternating current to the transformer module 200, the alternating current is output after being transformed by the transformer module 200, when the output voltage of the transformer module 200 is too high, the voltage division detection module 300 forms a feedback signal according to the output voltage, the control module 500 can control the symmetrical half-bridge module 100 to operate according to the feedback signal so as to adjust the output voltage of the transformer module 200, or the ambient temperature rises, the resistance of the Wen Minzu component 400 changes along with the change of temperature, the resistance of the voltage division detection module 300 correspondingly changes, so that the feedback signal is formed, the control module 500 can control the symmetrical half-bridge module 100 to operate according to the feedback signal so as to adjust the output voltage of the transformer module 200.
In some embodiments of the present utility model, as shown in fig. 3, wen Minzu assembly 400 includes a temperature sensitive resistor RT1, a resistor R1, and a resistor R2, with resistor R2 being connected in parallel with temperature sensitive resistor RT1 to form at least a partially resistive parallel branch, the resistive parallel branch being connected in series with resistor R1.
The temperature-sensitive resistor RT1 may be a resistor whose resistance value decreases with an increase in temperature, or a resistor whose resistance value increases with an increase in temperature, and the following description will be given by taking a resistor whose resistance value decreases with an increase in temperature as an example.
Because the temperature-sensitive resistor RT1 and the resistor R2 are connected in parallel, the resistance value of the temperature-sensitive resistor RT1 is increased, the resistance of the resistive parallel branch is increased, but the resistance value of the resistor R2 is not exceeded, the resistance value of the temperature-sensitive resistor RT1 is reduced, and the resistance of the resistive parallel branch is also reduced, so that the resistor R2 can be used for setting a threshold value for controlling the upper limit of the output voltage and the downward floating change amount of the output voltage.
The resistive parallel branch is connected with the resistor R1 in series, the resistance of the temperature-sensitive resistor RT1 is increased, the terminal voltage of the connecting end of the resistive parallel branch and the resistor R1 is reduced, and the resistance of the temperature-sensitive resistor RT1 is reduced, and the terminal voltage of the connecting end of the resistive parallel branch and the resistor R1 is increased.
In some embodiments of the present utility model, the voltage division detection module 300 further includes a voltage stabilizing triode U1, wherein a controlled end of the voltage stabilizing triode U1 is connected to one end of the Wen Minzu component 400 and one end of the resistor R3 respectively, a negative electrode of the voltage stabilizing triode U1 is connected to the control module 500, and a positive electrode of the voltage stabilizing triode U1 is grounded.
Under normal use state, when the terminal voltage of the connecting end of the resistive parallel branch and the resistor R1 is lower than the trigger threshold value of the controlled end of the voltage stabilizing triode U1, the voltage stabilizing triode U1 is disconnected, and when the terminal voltage of the connecting end of the resistive parallel branch and the resistor R1 is raised, the voltage stabilizing triode U1 can be triggered to be conducted, so that a feedback signal is formed.
In some embodiments of the present utility model, the voltage division detecting module 300 further includes an isolation module 700, wherein an input end of the isolation module 700 is connected to an output end of the voltage division detecting module 300, and an output end of the isolation module 700 is connected to the control module 500 to realize that the control module 500 is connected to an output end of the voltage division detecting module 300.
The isolation module 700 can limit external disturbances from entering the control module 500, thereby making the processing of the control module 500 and the formation of control signals acting on the symmetrical half-bridge module 100 more stable and accurate.
Specifically, the isolation module 700 includes a photo-coupler, and further includes a resistor R5 and a resistor R6, where one end of the resistor R5 is connected to the output end of the rectifying module 600, the other end of the resistor R5 is connected to one end of the resistor R6 and the positive electrode of the light emitter of the photo-coupler, and the other end of the resistor R6 is connected to the negative electrode of the light emitter of the photo-coupler and the negative electrode of the zener triode U1.
In some embodiments of the present utility model, the capacitor further includes a capacitor C1, a capacitor C2, and a resistor R4, where one end of the capacitor C1 is connected to one end of the capacitor C2, the controlled end of the zener diode U1, one end of the Wen Minzu component 400, and one end of the resistor R3, the other end of the capacitor C2 is connected to one end of the resistor R4, and the other end of the resistor R4 is connected to the other end of the capacitor C1, the negative electrode of the zener diode U1, and the control module 500, respectively, so that the voltage between the negative electrode of the zener diode U1 and the controlled end can be stabilized, and the zener diode U1 is driven to be turned on steadily when the voltage at the controlled end reaches the threshold value.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (7)

1. The utility model provides a symmetry half-bridge secondary side control by temperature change automatic step-down driving circuit which characterized in that includes:
symmetrical half-bridge modules;
the input end of the transformer module is connected with the output end of the symmetrical half-bridge module;
wen Minzu component and resistor R3, the Wen Minzu component is connected with the resistor R3 to form at least part of partial pressure detection module, the resistance value of the Wen Minzu component changes along with the temperature change, the sampling end of the partial pressure detection module is connected with the output end of the transformer module, and the partial pressure detection module forms a feedback signal according to the output voltage of the transformer module;
the control module is respectively connected with the output end of the voltage division detection module and the controlled end of the symmetrical half-bridge module, and controls the symmetrical half-bridge module to operate according to a feedback signal so as to adjust the output voltage of the transformer module.
2. The symmetrical half-bridge secondary side temperature controlled automatic buck driving circuit of claim 1, wherein: the Wen Minzu component comprises a temperature-sensitive resistor RT1, a resistor R1 and a resistor R2, wherein the resistor R2 is connected with the temperature-sensitive resistor RT1 in parallel to form at least part of a resistive parallel branch, and the resistive parallel branch is connected with the resistor R1 in series.
3. The symmetrical half-bridge secondary side temperature controlled automatic buck driving circuit of claim 1, wherein: the voltage division detection module further comprises a voltage stabilizing triode U1, the controlled end of the voltage stabilizing triode U1 is respectively connected with one end of the Wen Minzu component and one end of the resistor R3, the negative electrode of the voltage stabilizing triode U1 is connected with the control module, and the positive electrode of the voltage stabilizing triode U1 is grounded.
4. A symmetrical half-bridge secondary side temperature controlled automatic buck driving circuit according to claim 3, wherein: the capacitor comprises a capacitor C1, a capacitor C2 and a resistor R4, wherein one end of the capacitor C1 is respectively connected with one end of the capacitor C2, the controlled end of the voltage stabilizing triode U1, one end of the Wen Minzu component and one end of the resistor R3, the other end of the capacitor C2 is connected with one end of the resistor R4, and the other end of the resistor R4 is respectively connected with the other end of the capacitor C1, the negative electrode of the voltage stabilizing triode U1 and the control module.
5. The symmetrical half-bridge secondary side temperature controlled automatic buck driving circuit of claim 1, wherein: the device further comprises an isolation module, wherein the input end of the isolation module is connected with the output end of the partial pressure detection module, and the output end of the isolation module is connected with the control module so as to realize that the control module is connected with the output end of the partial pressure detection module.
6. The symmetrical half-bridge secondary side temperature controlled automatic buck driving circuit of claim 5, wherein: the isolation module includes a photo coupler.
7. The symmetrical half-bridge secondary side temperature controlled automatic buck driving circuit of claim 1, wherein: the symmetrical half-bridge module comprises a switch tube Q1, a switch tube Q2, a capacitor EC2 and a capacitor EC3, wherein the input end of the switch tube Q1 is connected with one end of the capacitor EC2 to form one pole of the input end of the symmetrical half-bridge module, the output end of the switch tube Q1 is respectively connected with one end of a primary coil of the transformer module and the input end of the switch tube Q2, the other end of the capacitor EC2 is respectively connected with one end of the capacitor EC3 and the other end of the primary coil of the transformer module, and the output end of the switch tube Q2 is connected with one end of the capacitor EC3 to form the other pole of the input end of the symmetrical half-bridge module.
CN202320335127.3U 2023-02-24 2023-02-24 Automatic temperature control step-down driving circuit for secondary side of symmetrical half bridge Active CN219554816U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202320335127.3U CN219554816U (en) 2023-02-24 2023-02-24 Automatic temperature control step-down driving circuit for secondary side of symmetrical half bridge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202320335127.3U CN219554816U (en) 2023-02-24 2023-02-24 Automatic temperature control step-down driving circuit for secondary side of symmetrical half bridge

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CN219554816U true CN219554816U (en) 2023-08-18

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