CN219627569U - Self-excitation type high-voltage activation power supply - Google Patents
Self-excitation type high-voltage activation power supply Download PDFInfo
- Publication number
- CN219627569U CN219627569U CN202320150040.9U CN202320150040U CN219627569U CN 219627569 U CN219627569 U CN 219627569U CN 202320150040 U CN202320150040 U CN 202320150040U CN 219627569 U CN219627569 U CN 219627569U
- Authority
- CN
- China
- Prior art keywords
- circuit
- self
- voltage
- power supply
- switching tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The utility model relates to a self-excitation type high-voltage activation power supply, which comprises an input control circuit, a control circuit and a control circuit, wherein the input control circuit is used for controlling the self-excitation type high-voltage activation power supply to be turned on or off; the self-oscillation circuit is connected with the input control circuit and is used for self-oscillating according to the control of the input control circuit so as to output a voltage signal; the feedback circuit is connected with the output end of the self-oscillation circuit and is used for collecting the voltage signal output by the self-oscillation circuit and generating a feedback signal, and the feedback circuit is also connected with the input end of the self-oscillation circuit and is used for inputting the feedback signal to the self-oscillation circuit; the activation control circuit is connected with the feedback circuit and is used for inputting an activation signal into the feedback circuit so as to enable the feedback circuit to output different feedback signals; the output circuit is connected with the output end of the self-oscillation circuit and is used for outputting power supply voltage according to the voltage signal output by the self-oscillation circuit. The problem that the technology of the current AC/DC high-voltage generator cannot be independently controlled and the production complexity is high is solved.
Description
Technical Field
The present utility model relates generally to the technical field of switching power supplies. More particularly, the present utility model relates to a self-exciting high voltage activated power supply.
Background
The self-oscillation type AC/DC high-voltage generator has the advantages of simple structure, low cost, stable and reliable performance and the like. However, the high-voltage activation power supply widely used at present mostly uses the driving mode of other excitation, and most of driving chips adopt foreign import industrial-level chips, and the driving chips cannot be controlled independently. And moreover, the technology of the driving chip is controlled by foreign technology sealing control, so that the expansion and improvement are not easy to carry out. If a large number of applications are needed, the purchasing period is longer, resulting in limited mass production. The domestic alternative chip has higher price and longer period, and is not beneficial to popularization and application of the direct current high voltage generator.
Based on this, how to realize the independent control of the technology of the ac/dc high voltage generator and reduce the complexity of the production thereof is a problem to be solved.
Disclosure of Invention
In order to solve one or more technical problems, the utility model provides that the control of the self-oscillation circuit is realized by utilizing a feedback circuit and an activation control, so that different voltage outputs can be adjusted according to requirements, the flexibility of the AC/DC high-voltage generator is enhanced, and the autonomous controllability of the technology is realized. And the circuit has simple structure, is easy to realize, and effectively reduces the production complexity.
To this end, the utility model provides a self-excited high-voltage activation power supply comprising: the input control circuit is used for controlling the self-excitation type high-voltage activation power supply to be turned on or off; the self-oscillation circuit is connected with the input control circuit and is used for self-oscillating according to the control of the input control circuit so as to output a voltage signal; the feedback circuit is connected with the output end of the self-oscillation circuit and is used for collecting the voltage signal output by the self-oscillation circuit and generating a feedback signal, and the feedback circuit is also connected with the input end of the self-oscillation circuit and is used for inputting the feedback signal to the self-oscillation circuit; an activation control circuit connected with the feedback circuit for inputting an activation signal to the feedback circuit so that the feedback circuit outputs different feedback signals; and the output circuit is connected with the output end of the self-oscillation circuit and is used for outputting power supply voltage according to the voltage signal output by the self-oscillation circuit.
In one embodiment, the self-oscillation circuit comprises a starting circuit, a first switch tube, an oscillation transformer and a self-oscillation regulating circuit, wherein the starting circuit is connected with a control electrode of the first switch tube, an input end of the oscillation transformer is connected with an output end of the first switch tube and is used for self-oscillating according to a control signal output by the first switch to output a voltage signal, and the self-oscillation regulating circuit is connected with the input end of the starting circuit and the output end of the oscillation transformer and is used for regulating the on or off state of the first switch tube according to the voltage signal output by the oscillation transformer.
In one embodiment, the input control circuit includes an input filter circuit, an under-voltage protection circuit and an input control circuit, where the input filter circuit is connected with an external dc power supply and is used for filtering the input power supply, the input end of the under-voltage protection circuit is connected with the output end of the input filter circuit and is used for controlling the self-excited high-voltage activation power supply to be turned off when the input power supply is under-voltage, and the input control circuit is connected with the input end of the under-voltage protection circuit and is used for controlling the self-excited high-voltage activation power supply to be turned on or off according to an input control signal.
In one embodiment, the switching device further comprises an overcurrent protection circuit, wherein the overcurrent protection circuit is connected with the output end of the first switching tube and the input end of the starting circuit, and is used for collecting the current of the output end of the first switching tube and driving the starting circuit to adjust the driving current input into the first switching tube according to the current.
In one embodiment, the self-excitation regulating circuit comprises a rectifying diode and a self-excitation capacitor, wherein the positive electrode of the rectifying diode is connected with the secondary side of the oscillating transformer, the negative electrode of the rectifying diode is connected with the control electrode of the first switching tube and is used for rectifying a signal output by the secondary side of the oscillating transformer, and the self-excitation capacitor is connected with the rectifying diode in parallel and is used for controlling the conduction state of the first switching tube through a charging and discharging process.
In one embodiment, the feedback circuit includes a sampling circuit and a fourth switching tube, the sampling circuit is connected with an output end of the oscillating transformer, and is used for collecting an output voltage of the oscillating transformer to obtain a sampling value, a control electrode of the fourth switching tube is connected with the sampling circuit, and is used for controlling a state of the fourth switching tube according to the sampling value, and an output end of the fourth switching tube is also connected with a control electrode of the first switching tube, and is used for adjusting the state of the first switching tube according to the state of the fourth switching tube.
In one embodiment, the self-excited high-voltage power supply further comprises an overvoltage protection circuit, wherein the overvoltage protection circuit is connected with the output end of the oscillating transformer and the control electrode of the first switching tube and is used for controlling the first switching tube to be closed when the output voltage is larger than a set value so as to control the self-excited high-voltage activated power supply to be closed.
In one embodiment, the activation control circuit includes a fifth switching tube and an optocoupler, wherein a control electrode of the fifth switching tube is used for inputting a trigger signal, an output end of the fifth switching tube is connected with a primary side of the optocoupler, and a secondary side of the optocoupler is connected with the feedback circuit and is used for driving the feedback circuit to output different feedback signals.
In one embodiment, the output circuit comprises a rectifying circuit and a bleeder circuit, wherein the rectifying circuit is connected with the output end of the oscillating transformer and is used for rectifying the output voltage and then outputting a direct-current voltage, and the bleeder circuit is connected with the output end of the rectifying circuit and is used for reducing the high voltage drop to a safe voltage after the self-excited high-voltage activation power supply is turned off.
In one embodiment, the power supply further comprises a short-circuit protection circuit, wherein the short-circuit protection circuit is connected with the output end of the rectifying circuit and the control electrode of the first switching tube and is used for pulling down the driving current of the control electrode of the first switching tube when the power supply output is short-circuited so as to realize short-circuit protection.
According to the utility model, the output voltage of the oscillating transformer can be regulated through the feedback circuit, so that flexible and autonomous control of voltage output is realized, and the flexibility of the AC/DC power supply generator is effectively improved. Meanwhile, the circuit structure is not limited by the form of a driving chip, the composition structure is simple and easy to realize, the complexity and the production cost of the circuit composition are effectively reduced, and the circuit structure is favorable for popularization and application. Furthermore, the utility model enriches the functions of the circuit structure and effectively improves the stability and reliability of the power supply by arranging the corresponding self-excitation regulating circuit, the protection circuit and the like.
Drawings
The above, as well as additional purposes, features, and advantages of exemplary embodiments of the present utility model will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. In the drawings, embodiments of the utility model are illustrated by way of example and not by way of limitation, and like reference numerals refer to similar or corresponding parts and in which:
fig. 1 is a schematic diagram schematically illustrating a self-excited high voltage activated power supply according to an embodiment of the present utility model;
FIG. 2 is a specific block diagram schematically illustrating a self-excited high voltage activation power supply according to an embodiment of the present utility model;
fig. 3 is a partial circuit diagram schematically illustrating a self-excited high voltage activated power supply according to an embodiment of the present utility model;
fig. 4 is a circuit diagram schematically showing an input control circuit according to an embodiment of the present utility model;
fig. 5 is a circuit diagram schematically showing an activation control circuit according to an embodiment of the present utility model;
fig. 6 is a schematic diagram schematically illustrating an oscillating transformer according to an embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Specific embodiments of the present utility model are described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram schematically illustrating a self-excited high voltage activated power supply according to an embodiment of the present utility model.
As shown in fig. 1, the self-excited high-voltage activation power supply includes an input control circuit, a self-excited oscillation circuit, a feedback circuit, an activation control circuit, and an output circuit.
Specifically, the input control circuit can be used for controlling the on or off of the self-excited high-voltage activated power supply. In some embodiments, the input control circuit may process the input voltage to minimize the ac component of the input voltage so that the input voltage is smoothed. Meanwhile, the input control circuit can also be used for designing the input protection of the power supply, for example, the input minimum threshold value is set, and when the input is smaller than the design value, the power supply is input for protection and cannot work normally. Furthermore, the input control circuit is also used for controlling the working state of the power supply system through an external small signal. By inputting a small signal, self-oscillation of the power supply is realized.
The self-oscillation circuit can be connected with the input control circuit and is used for self-oscillating according to the control of the input control circuit so as to output a voltage signal. In some embodiments, the self-oscillation circuit can realize the conversion from low voltage to high voltage, and can realize the self-oscillation process through the control of the switching-on and switching-off processes of the oscillating transformer by the switching tube.
The feedback circuit can be connected with the output end of the self-oscillation circuit and is used for collecting the voltage signal output by the self-oscillation circuit and generating a feedback signal, and the feedback circuit is also connected with the input end of the self-oscillation circuit and is used for inputting the feedback signal to the self-oscillation circuit. In some embodiments, the feedback circuit input may adjust the voltage transition state of the self-oscillating circuit to achieve voltage outputs of different magnitudes.
The activation control circuit may be connected to the feedback circuit for inputting an activation signal to the feedback circuit to cause the feedback circuit to output a different feedback signal. Based on this, different output voltage settings can be achieved by activating the control circuit to control the feedback signal of the feedback circuit.
The output circuit can be connected with the output end of the self-oscillation circuit and is used for outputting power supply voltage according to the voltage signal output by the self-oscillation circuit. In some embodiments, the output circuit may implement a rectified output and a post-shutdown bleed function, thereby implementing the reliability of the power supply. Further, a corresponding instantaneous short-circuit protection function can be set, so that the reliable output of the power supply is ensured.
The simple description of the composition and principles of the self-excited high voltage activated power supply of the present utility model described above in connection with fig. 1 will be described in detail below in connection with specific circuit blocks.
Fig. 2 is a specific block diagram schematically showing a self-excited high-voltage activated power supply according to an embodiment of the present utility model.
As shown in fig. 2, in the self-excited high-voltage activated power supply, the input control circuit may include an input filter circuit 1, an under-voltage protection circuit 2, and an input control circuit 3. The input filter circuit 1 is connected to an external dc power supply for filtering the input power supply. The input end of the undervoltage protection circuit 2 is connected with the output end of the input filter circuit 1 and is used for controlling the self-excited high-voltage activation power supply to be closed when the input power supply is undervoltage. The input control circuit 3 is connected with the input end of the undervoltage protection circuit 2 and is used for controlling the self-excitation type high-voltage activation power supply to be turned on or turned off according to an input control signal.
The self-oscillation circuit comprises a starting circuit 4, a first switching tube 6, an oscillation transformer 5 and a self-excitation regulating circuit 12. The switching-on circuit 4 is connected to the control electrode of the first switching tube 6. The input end of the oscillating transformer 5 is connected with the output end of the first switch tube 6, and is used for self-oscillating according to the control signal output by the first switch to output a voltage signal. The self-excitation regulating circuit 12 is connected with the input end of the starting circuit 4 and the output end of the oscillating transformer 5, and is used for regulating the on or off state of the first switching tube 6 according to the voltage signal output by the oscillating transformer.
Further, the self-oscillation circuit may further include an overcurrent protection circuit 7. The overcurrent protection circuit 7 is connected with the output end of the first switching tube 6 and the input end of the starting circuit, and is used for collecting the current of the output end of the first switching tube and adjusting the driving current input into the first switching tube according to the current driving starting circuit.
The feedback circuit 10 may be connected to the output of the oscillating transformer 5, and may collect the output signal of the oscillating transformer to generate a corresponding feedback signal. Meanwhile, the feedback circuit 10 may also be connected to the activation control circuit 13, and select different feedback signals for output according to the trigger signal of the activation control circuit 13, so as to realize control of different output voltages. The feedback circuit 10 is also connected to the input of the opening circuit 4, so that a feedback signal is sent to the opening circuit to adjust the duty cycle of the first switching tube by the opening circuit, thereby realizing voltage adjustment.
Further, the feedback circuit 10 may also be connected to an overvoltage protection circuit 11 to prevent an overvoltage condition from occurring in the power supply. The overvoltage protection circuit 11 may be connected to the input of the switching-on circuit 4 so that the switching-on circuit 4 controls the power supply to be switched off in case of an overvoltage condition.
The output circuit 8 may be connected to the output terminal of the oscillating transformer 5, so as to rectify the output voltage, discharge the output voltage, and the like. Further, the output circuit 8 may be further connected to a short-circuit protection circuit 9 to realize a short-circuit protection function for the output terminal.
Fig. 3 is a partial circuit diagram schematically illustrating a self-excited high-voltage activated power supply according to an embodiment of the present utility model. It should be noted that, in fig. 3, the structures of the input filter circuit 1, the under-voltage protection circuit 2, the turn-on circuit 4, the oscillating transformer 5, the first switching tube 6, the over-current protection circuit 7, the output circuit 8, the short-circuit protection circuit 9, the feedback circuit 10, the over-voltage protection circuit 11, and the self-excitation regulating circuit 12 may be implemented in fig. 2. Based on this, the description about the circuit parts in fig. 2 also applies to fig. 3.
As shown in fig. 3, the input filter circuit 1 may be a pi-type filter circuit. Specifically, the circuit may include a ceramic capacitor C9, a ceramic capacitor C10, a differential mode inductance L1, a ceramic capacitor C11, and a ceramic capacitor C12. In the pi-type filter circuit, one electrode of C9 is connected with an input positive electrode, one electrode of C9 is connected with an input negative electrode, a ceramic capacitor C9 is connected with C10 in parallel, differential-mode inductors L1 and L1 are connected with a ceramic capacitor C11 after the parallel connection, and the ceramic capacitors C11 and C12 are connected in parallel. C9, C10, C11, C12 are simultaneously connected to the negative input terminal. In the input filter circuit, the pi-shaped filter circuit is formed by connecting two capacitance elements and an inductance element in series between the two capacitance elements, so that the input filter circuit has better high-frequency filter performance. The input capacitor is a ceramic capacitor of 100V, and the filter inductor is a differential mode inductor, so that the volume and weight of the product can be reduced.
The undervoltage protection circuit 2 includes voltage dividing resistors R7, R13, a voltage stabilizing tube D8, and a second switching tube Q2. The voltage dividing resistor R7 and the resistor R13 are connected in series, the ceramic capacitor C12 in the input filter circuit 1 is connected in parallel to both ends of the voltage dividing resistor R7 and the resistor R13, the serial connection point of the voltage dividing resistor R7 and the resistor R13 is connected with the cathode of the voltage stabilizing tube D8, and the anode of the voltage stabilizing tube D8 is connected with the control electrode of the second switching tube Q2. The other end of R13 is connected with the negative electrode input end. In practical application, the circuit can adopt 5.6V voltage-stabilizing tube to embed and press, and when input voltage is greater than 7V, second switch tube Q2 can switch on, and the later stage circuit can only work.
The specific structure of the input control circuit is also shown in fig. 4. The input control circuit comprises a current limiting resistor R19, a voltage dividing resistor R20, an absorption capacitor C15 and a control optocoupler U3. The control signal flows through a current limiting resistor R19, the R19 is connected with the 1 pin of the third optocoupler U3, the 2 pin of the U3 is connected with the input negative, and the R20 and the C15 are connected in parallel and then are respectively connected with the 1 pin and the 2 pin of the U3. The 3 pin of U3 connects the negative pole of the steady voltage tube D8, the 4 pin of U3 connects the negative pole input. The input control circuit uses the optocoupler as a control device, when the control signal is in a low level, the 3 pin and the 4 pin of the optocoupler are suspended, the B pole of the Q2 has driving capability, the Q2 is conducted, and the circuit works normally. When the control signal is at a high level, the 3 pin and the 4 pin of the optocoupler are pulled down, the B pole of the Q2 is pulled down, the Q2 cannot be conducted, and the circuit cannot work.
The starting circuit 4 comprises a current limiting resistor R4, a pull-down resistor R14, a voltage-stabilizing embedded tube D5, a current limiting resistor R8 and a third switching tube Q3. R4 is connected with the differential-mode inductor L1, R4 is connected with a pull-down resistor R14, the connection point of R4 and R14 is connected with the collector (C pole) of the second switching tube Q2, and is simultaneously connected with the base (B pole) of the third switching tube Q3, R14 is connected with the negative input end, D5 cathode is connected with the differential-mode inductor L1, D5 anode is connected with a current-limiting resistor R8, R8 is connected with the collector (C pole) of the third switching tube Q3, and the emitter (E pole) of the third switching tube Q3 is connected with the negative input end. In the working process, when the control is turned off, Q2 is turned on, the pole B of Q3 is pulled low, the input flows through D5 and R5 to provide driving current for the switching tube Q1, and the power supply works normally. When the control is started, Q2 cannot be conducted, driving current flowing through R4 and R14 to form Q3 is input, Q3 is conducted, the B pole of Q1 is pulled down, and the power supply stops working.
The oscillating transformer 5 can be divided into a primary side input TY1, a secondary side output TC2, and a secondary side output TC3. The head end of TY1 is connected with the differential-mode inductor L1. As shown in fig. 6, the oscillating transformer may use an isolated high frequency transformer as shown in the following figures: the tape end is the head end, and the tail end is the opposite end. TY1 is the primary side, TC1, TC2 and TC3 are the secondary side windings.
The base electrode of the first switching tube Q1 can be connected with the connection point of the current limiting resistor R8 and Q3, and the C electrode of the first switching tube Q1 is connected with the tail end of the TY 1. R12 is connected with the B pole and the E pole of Q1 respectively. The power supply of the utility model uses the triode as an electronic switch on the primary side of the transformer, realizes the conduction degree of the transformer according to the conduction characteristic of the triode, and can be divided into three stages of cut-off, amplification and turn-on.
The overcurrent protection circuit 7 includes current detection resistors R15 and R17, a current limiting resistor R16, and an absorption capacitor C13. The current detection resistors R15 and R17 are connected in parallel between the E pole and the negative input terminal of the first switching tube Q1. The current limiting resistor R16 is connected with the absorption capacitor C13 in parallel, one end of the parallel connection is connected with the E pole of the first switching tube Q1, and the other end of the parallel connection is connected with the feedback circuit. When the input current increases, the voltage of the current detection resistor increases, the driving capability of the Q4 increases, the CE pole current of the Q4 increases, the driving current of the Q1 is pulled down, and the CE pole conduction current of the Q1 becomes low, so that overcurrent protection is realized.
The feedback circuit 10 may include a sampling circuit and a fourth switching tube. The sampling circuit is connected with the output end of the oscillating transformer and is used for collecting the output voltage of the oscillating transformer to obtain a sampling value. The control electrode of the fourth switching tube is connected with the sampling circuit and used for controlling the state of the fourth switching tube according to the sampling value. The output end of the fourth switching tube is also connected with the control electrode of the first switching tube and is used for adjusting the state of the first switching tube according to the state of the fourth switching tube. Specifically, a feedback circuit may be connected to the secondary side output TC3 of T1 to sample the output voltage. The circuit comprises a rectifier diode D11, a filter capacitor C16, a load resistor R21, a current-limiting resistor R6, a voltage-regulator tube D7, a voltage-regulator tube D9 and a regulating triode Q4.
The anode of the rectifier diode D11 is connected with the tail end of the TC3, the head section of the TC3 is connected with the negative electrode input end, the filter capacitor C16 and the load resistor R21 are connected in parallel, one end of the filter capacitor C16 is connected with the cathode of the D11, the other end of the filter capacitor C is connected with the head section of the TC3, the current-limiting resistor R6 is connected with the cathode of the rectifier diode D11, one end of the filter capacitor is connected with the cathode of the voltage stabilizing tube D7, the anode of the voltage stabilizing tube D7 is connected with the cathode of the voltage stabilizing tube D9 in series, the anode of the voltage stabilizing tube D9 is connected with the B pole of the regulating triode Q4, and the C pole of the Q4 is connected with the B pole of the first switching tube Q1.
In the feedback circuit, the secondary side of the transformer is used for rectifying stable VCC voltage, the VCC voltage drives Q4 after passing through two voltage stabilizing tubes, and the duty ratio of Q1 is controlled through the change of driving current.
In some embodiments, the self-excitation adjusting circuit includes a rectifying diode and a self-excitation capacitor, wherein an anode of the rectifying diode is connected with a secondary side of the oscillating transformer, a cathode of the rectifying diode is connected with a control electrode of the first switching tube, and is used for rectifying a signal output by the secondary side of the oscillating transformer, and the self-excitation capacitor is connected with the rectifying diode in parallel and is used for controlling a conduction state of the first switching tube through a charging and discharging process.
Specifically, the self-excitation regulating circuit comprises a secondary side output TC2 of T1, a rectifying diode D6, a self-excitation capacitor C8, current limiting resistors R10 and R11 and a current limiting resistor R9. The tail end of TC2 is connected with the input negative, the anode of a rectifying diode D6 is connected with the head end of TC2, the cathode of a voltage stabilizing tube D6 is connected with a current limiting resistor R10, a self-excitation capacitor C8 is connected with the rectifying tube D6 in parallel, and the current limiting resistor R10 is connected with the B pole of a first switching tube Q1 after being connected with the R11 in parallel. After the secondary winding rectifies, positive feedback is provided to the primary side. And the charge and discharge of the self-excited capacitor are utilized to realize the control of the conduction state of the Q1.
And the overvoltage protection circuit is connected with the output end of the oscillating transformer and the control electrode of the first switching tube and is used for controlling the first switching tube to be closed when the output voltage is larger than a set value so as to control the self-excited high-voltage activation power supply to be closed. Specifically, the overvoltage protection circuit comprises a current limiting resistor R18, a voltage-embedded voltage stabilizing tube D10 and a second optocoupler U2. The current limiting resistor R18 is connected with the cathode of the rectifier diode D11, one end of the current limiting resistor R18 is connected with the cathode of the embedded voltage stabilizing tube D10, the anode of the voltage stabilizing tube D10 is connected with the 1 pin of the second optocoupler device U2, the 2 pin of the optocoupler is connected with the input negative, the 3 pin of the optocoupler is connected with the B pole of the first switching tube Q1, and the 4 pin of the optocoupler is connected with the negative input end. In the overvoltage protection circuit, VCC passes through a voltage stabilizing tube to control an optocoupler, when the VCC exceeds a certain threshold value, the optocoupler is conducted, the B pole of Q1 is pulled down, and the power supply stops working.
In some embodiments, the activation control circuit includes a fifth switching tube and an optocoupler, a control electrode of the fifth switching tube is used for inputting a trigger signal, an output end of the fifth switching tube is connected with a primary side of the optocoupler, and a secondary side of the optocoupler is connected with the feedback circuit and is used for driving the feedback circuit to output different feedback signals. The structure of the activation control circuit is shown in fig. 5, and the activation control circuit includes a current limiting resistor R22, a control optocoupler U4, a trigger current limiting resistor R23, a trigger switching tube Q5, a pull-down resistor R24, and an absorption capacitor C17. The current limiting resistor R22 is connected with the positive electrode input end, one end of the current limiting resistor R22 is connected with the 1 pin of the fourth optocoupler U4, the 2 pin of the U4 is connected with the negative input end, the pull-down resistor R24 is connected with the 1 pin and the 2 pin of the U4 after being connected with the absorption capacitor C17 in parallel, the 3 pin of the U4 is connected with the anode of the voltage stabilizing tube D7, the 4 pin of the U4 is connected with the anode of the voltage stabilizing tube D9, the current limiting resistor R23 contacts and sends out control signals, one end of the current limiting resistor R is connected with the B pole of the third switching tube Q3, the C pole of the Q3 is connected with the 1 pin of the U4, and the E pole of the Q3 is connected with the 2 pin of the U4. When the power supply works normally, the trigger signal is low, the secondary side 1 and the secondary side 2 of the optical coupler U4 are pulled down, the circuit outputs DC500V, when the trigger signal is high, the secondary side 1 and the secondary side 2 of the optical coupler U4 are suspended, and the circuit outputs DC500V, so that control of different output voltages is realized.
The output circuit comprises a rectifying circuit and a bleeder circuit, wherein the rectifying circuit is connected with the output end of the oscillating transformer and used for rectifying the output voltage and then outputting direct-current voltage, and the bleeder circuit is connected with the output end of the rectifying circuit and used for reducing the high voltage drop to safe voltage after the self-excited high-voltage activation power supply is closed. Specifically, the output circuit includes a secondary side output TC1 of T1, rectifier diodes D1, D2, D3, D4, spike absorbing capacitors C1, C2, C3, C4, a spike absorbing resistor R1, output filter capacitors C5, C6, C7, and high voltage bleeder resistors R3, R5.
Rectifier diode D1, D2, D3 and D4 establish ties each other, and the tail end of TC1 is connected to the positive pole of D1, and peak absorption capacitance resistance C1, C2, C3, C4 and R1 establish ties, and the tail end of TC1 is connected to C1, and the negative pole of R1 even D4, output filter capacitance C5, C6 and C7 are parallelly connected after, connect the first section of the negative pole of D4 and TC1 respectively, and R3 and R5 establish ties, and R3 one end termination D4's negative pole, and R5 one end is connected TC 1's head end. In practical application, the secondary side of the oscillating transformer outputs direct-current high voltage after being rectified by the diodes, 4 diodes are connected in series to resist the high voltage of more than 2000V, so that the design requirement is met, two 2M resistors are connected in series to perform high-voltage discharge, and the output high voltage is reduced to safe voltage in a short time after the power supply is turned off.
The power supply further comprises a short-circuit protection circuit. The short-circuit protection circuit is connected with the output end of the rectifying circuit and the control electrode of the first switching tube and is used for pulling down the driving current of the control electrode of the first switching tube when the power supply output is in short circuit so as to realize short-circuit protection. Specifically, the short-circuit protection circuit includes a current detection resistor R2 and a first optocoupler U1, where the first optocoupler U1 is used to detect an output voltage. One end of the current detection resistor R2 is connected with the cathode of the rectifying diode D4 in the output circuit, and the other end is connected with the positive output end. The 1 pin of the first optocoupler is connected with the cathode of the rectifying diode D4, the 2 pin is connected with the output end of the positive electrode, the 3 pin is connected with the B pole of the first switching tube Q1, and the 4 pin is grounded. After the power supply output is instantaneously shorted, enough voltage is generated by the resistor current, so that the voltage exists on the primary side of the optocoupler, the secondary side of the optocoupler is conducted, the driving current of Q1 is pulled down, the CE pole conducting current of Q1 is lowered, and therefore short-circuit protection is achieved.
The working principle of the self-excited high-voltage activated power supply is as follows: when the power supply supplies power to the later stage through the input filter circuit and the switch is controlled to be in a low level, 3 pins and 4 pins of the third optocoupler U3 are input to control to be suspended, after the input voltage is embedded through D8, a driving current is formed to lead Q2 to be conducted, the B pole of Q3 is pulled down to be in a low level after Q2 is conducted, Q3 is in a cut-off state, the switching tubes Q1 and Q1 are driven to be conducted slowly after the input voltage is embedded through D5 and R8, and TY1 is an upper positive and lower negative potential. TC2 charges C8 first after the potential is formed by using the same phase of the head end and the tail end of TY1 and the positive potential and the negative potential, and after the positive conducting voltage of D6 is greater than or equal to the charging, the B pole conducting current of Q1 is increased through the parallel resistance of R10 and R11, and at the moment, after Q1 is saturated, IC is not increased. The TY1 forward magnetic flux is gradually changed to zero. Similarly, TC2 generates a negative reverse potential, and at the moment, the voltages at two ends of C8 are reversed, the voltage of Q1 is pulled down, and the light pipe Q1 is in a cut-off state. And repeating the working state in the next period, thereby forming the self-excited oscillation power supply.
According to the above-described circuit configuration shown in fig. 3 to 6, the self-excited high-voltage activated power supply has the following power supply characteristics: (1) input characteristics: DC9V-36V. (2) output characteristics: DC500V/DC1500V. (3) control function: the power supply is provided with an external switching control signal, and when the control signal is low level, the circuit works, and when the switching signal is high level, the circuit cannot work. (4) activate function: when the power supply works normally, the trigger signal is low, the circuit outputs DC1500V, and when the trigger signal is high, the circuit outputs DC500V. (5) protection function: the power output has a short-circuit protection function, and the power is not damaged after instantaneous short-circuit. The power supply output has an overcurrent protection function. The power supply output has an overvoltage protection function. (6) isolation characteristics: the circuit inputs and outputs are isolated from each other.
The terms "first" or "second" and the like as used in this specification are used for reference to numbers or ordinal numbers only for descriptive purposes, such as first switching tube, second switching tube, first optocoupler, second optocoupler, etc., and are not to be construed as either explicit or implicit relative importance or implicit indication of the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present specification, the meaning of "plurality" means at least two, for example, two, three or more, etc., unless explicitly defined otherwise.
While various embodiments of the present utility model have been shown and described herein, it will be obvious to those skilled in the art that such embodiments are provided by way of example only. Many modifications, changes, and substitutions will now occur to those skilled in the art without departing from the spirit and scope of the utility model. It should be understood that various alternatives to the embodiments of the utility model described herein may be employed in practicing the utility model. The appended claims are intended to define the scope of the utility model and to cover such modular compositions, equivalents, or alternatives falling within the scope of the claims.
Claims (10)
1. A self-exciting high voltage activated power supply comprising:
the input control circuit is used for controlling the self-excitation type high-voltage activation power supply to be turned on or off;
the self-oscillation circuit is connected with the input control circuit and is used for self-oscillating according to the control of the input control circuit so as to output a voltage signal;
the feedback circuit is connected with the output end of the self-oscillation circuit and is used for collecting the voltage signal output by the self-oscillation circuit and generating a feedback signal, and the feedback circuit is also connected with the input end of the self-oscillation circuit and is used for inputting the feedback signal to the self-oscillation circuit;
an activation control circuit connected with the feedback circuit for inputting an activation signal to the feedback circuit so that the feedback circuit outputs different feedback signals; and
and the output circuit is connected with the output end of the self-oscillation circuit and is used for outputting power supply voltage according to the voltage signal output by the self-oscillation circuit.
2. The self-excited high-voltage activated power supply according to claim 1, wherein the self-excited oscillation circuit comprises an opening circuit, a first switching tube, an oscillation transformer and a self-excited regulating circuit, the opening circuit is connected with a control electrode of the first switching tube, an input end of the oscillation transformer is connected with an output end of the first switching tube and is used for self-excited oscillation according to a control signal output by the first switching tube so as to output a voltage signal, and the self-excited regulating circuit is connected with the input end of the opening circuit and the output end of the oscillation transformer and is used for regulating the on or off state of the first switching tube according to the voltage signal output by the oscillation transformer.
3. The self-excited high-voltage activated power supply according to claim 1, wherein the input control circuit comprises an input filter circuit, an undervoltage protection circuit and an input control circuit, the input filter circuit is connected with an external direct current power supply and used for filtering the input power supply, the input end of the undervoltage protection circuit is connected with the output end of the input filter circuit and used for controlling the self-excited high-voltage activated power supply to be turned off when the input power supply is undervoltage, and the input control circuit is connected with the input end of the undervoltage protection circuit and used for controlling the self-excited high-voltage activated power supply to be turned on or off according to an input control signal.
4. The self-excited high-voltage activated power supply of claim 2, further comprising an over-current protection circuit connected to the output terminal of the first switching tube and the input terminal of the turn-on circuit, for collecting the current of the output terminal of the first switching tube and driving the turn-on circuit to adjust the driving current input to the first switching tube according to the current.
5. The self-excited high-voltage activated power supply according to claim 2, wherein the self-excited regulating circuit comprises a rectifying diode and a self-excited capacitor, the positive electrode of the rectifying diode is connected with the secondary side of the oscillating transformer, the negative electrode of the rectifying diode is connected with the control electrode of the first switching tube and is used for rectifying a signal output by the secondary side of the oscillating transformer, and the self-excited capacitor is connected with the rectifying diode in parallel and is used for controlling the conduction state of the first switching tube through a charging and discharging process.
6. The self-excited high-voltage activated power supply according to claim 2, wherein the feedback circuit comprises a sampling circuit and a fourth switching tube, the sampling circuit is connected with the output end of the oscillating transformer and is used for collecting the output voltage of the oscillating transformer to obtain a sampling value, the control electrode of the fourth switching tube is connected with the sampling circuit and is used for controlling the state of the fourth switching tube according to the sampling value, and the output end of the fourth switching tube is also connected with the control electrode of the first switching tube and is used for adjusting the state of the first switching tube according to the state of the fourth switching tube.
7. The self-excited high-voltage activated power supply of claim 2 further comprising an overvoltage protection circuit connected to the output of the oscillating transformer and to the control electrode of the first switching tube for controlling the first switching tube to close to control the self-excited high-voltage activated power supply to close when the output voltage is greater than a set value.
8. The self-excited high-voltage active power supply according to claim 1, wherein the active control circuit comprises a fifth switching tube and an optocoupler device, a control electrode of the fifth switching tube is used for inputting a trigger signal, an output end of the fifth switching tube is connected with a primary side of the optocoupler device, and a secondary side of the optocoupler device is connected with the feedback circuit and used for driving the feedback circuit to output different feedback signals.
9. The self-excited high-voltage activated power supply according to claim 2, wherein the output circuit comprises a rectifying circuit and a bleeder circuit, the rectifying circuit is connected with the output end of the oscillating transformer and is used for rectifying the output voltage and outputting a direct-current voltage, and the bleeder circuit is connected with the output end of the rectifying circuit and is used for reducing the high-voltage to a safe voltage after the self-excited high-voltage activated power supply is turned off.
10. A self-excited high-voltage activated power supply as claimed in claim 9 further comprising a short-circuit protection circuit connected to the output of the rectifying circuit and to the control electrode of the first switching tube for pulling down the drive current of the control electrode of the first switching tube when the power supply output is short-circuited to achieve short-circuit protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320150040.9U CN219627569U (en) | 2023-02-01 | 2023-02-01 | Self-excitation type high-voltage activation power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320150040.9U CN219627569U (en) | 2023-02-01 | 2023-02-01 | Self-excitation type high-voltage activation power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219627569U true CN219627569U (en) | 2023-09-01 |
Family
ID=87774057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320150040.9U Active CN219627569U (en) | 2023-02-01 | 2023-02-01 | Self-excitation type high-voltage activation power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219627569U (en) |
-
2023
- 2023-02-01 CN CN202320150040.9U patent/CN219627569U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100435465C (en) | Freely oscillating flyback converter comprising current limiting and voltage clamping | |
| CN201001217Y (en) | LED driving power supply | |
| CN112468011B (en) | Voltage-limiting shaping circuit applied to high-voltage microsecond pulse power supply | |
| CN110707932A (en) | Integrated PFC high-voltage half-bridge resonance synchronous rectification AC/DC power module | |
| CN2650393Y (en) | Isolated self-oscillation reverse exciting inverter | |
| CN106921303B (en) | Switching power supply transformer | |
| CN1905310A (en) | Low ripple high reliable high-capacity capacitance voltage stabilizing charging circuit | |
| CN110221645B (en) | Ripple current generating circuit | |
| CN101025636A (en) | Transformer coupled purallel switch type voltage-stabilized source | |
| CN207782395U (en) | A kind of thermal-shutdown circuit and electronic equipment | |
| CN104426377A (en) | Wide-input voltage flyback-type switch power supply applicable to drive of direct-current motor | |
| CN219627569U (en) | Self-excitation type high-voltage activation power supply | |
| CN218783723U (en) | Flyback switching power supply based on control chip | |
| CN110350802B (en) | Double-transformer self-oscillation type half-bridge driving voltage-multiplying conversion circuit | |
| CN210518114U (en) | Integrated PFC high-voltage half-bridge resonance synchronous rectification AC/DC power module | |
| CN105490548A (en) | Switching power device | |
| CN218449862U (en) | Novel pulse plasma power supply | |
| CN2572664Y (en) | Switch power source with short circuit protection | |
| CN115603552A (en) | Flyback switching power supply AC-DC conversion circuit | |
| CN106571743B (en) | Double-tube forward switch power supply circuit | |
| CN211701851U (en) | Switch power supply | |
| CN114552966A (en) | Switching power supply for stepping motor driver | |
| CN209896915U (en) | Self-excited flyback converter | |
| CN203457054U (en) | Wide input voltage flyback switching power supply suitable for DC motor driving | |
| CN106452021A (en) | Fly-back switching power supply circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |