Hiccup circuit and power supply circuit

Abstract

The utility model discloses a hiccup circuit and a power supply circuit, and belongs to the technical field of power supplies. The hiccup circuit comprises an amplification circuit, a comparison circuit, a timing circuit, a switching circuit and a voltage stabilization feedback circuit, the timing circuit comprises a charging circuit, a discharging circuit and a first capacitor, and the charging circuit and the discharging circuit can be switched on and off by respectively adjusting the resistance value in the charging circuit and the resistance value in the discharging circuit. The charging duration and the discharging duration of the first capacitor are respectively adjusted, so that the turn-on time and the turn-off time of hiccup protection are respectively and independently controlled, the turn-on time and the turn-off time of hiccup protection can be flexibly adjusted, the applicability of the hiccup circuit is improved, and through the combination of the amplification circuit and the comparison circuit, the reliability of the hiccup protection circuit is improved. According to the technical scheme, the current entering hiccup protection can be more accurately controlled, and after the current is amplified, a current detection resistor with a smaller resistance value can be used, so that the power consumption can be reduced, and the efficiency can be improved.

Description

Technical Field

[0001] This utility model relates to the field of power supply technology, and in particular to a hiccup circuit and a power supply circuit. Background Technology

[0002] With the development of electrical technology, the requirements for equipment circuits are becoming increasingly stringent. Currently, to ensure the normal operation of circuits in equipment under abnormal conditions such as overvoltage and overcurrent, hiccup circuits are commonly used in various electronic devices requiring overcurrent protection, such as power supply circuits, motor drive circuits, and LED lighting circuits. Hiccup circuits can protect equipment circuits from the effects of abnormal conditions such as overcurrent, improving the reliability and stability of the equipment.

[0003] The hiccup circuit protects the power supply and electronic devices by detecting the operating status of the circuit and, when an abnormality is detected, by regularly and intermittently shutting down the circuit.

[0004] However, existing hiccup circuits cannot flexibly adjust the on and off times of hiccup protection, resulting in low applicability of hiccup circuits. Utility Model Content

[0005] This utility model embodiment provides a hiccup circuit and a power supply circuit. It can solve the problem of low applicability of existing hiccup circuits. The technical solution is as follows:

[0006] According to one aspect of the present invention, a hiccup circuit is provided, the hiccup circuit comprising: an amplifier circuit, a comparator circuit, a timing circuit, a switching circuit, and a voltage regulation feedback circuit;

[0007] The input terminal of the amplifier circuit is electrically connected to the power supply circuit, and the output terminal of the amplifier circuit is electrically connected to the input terminal of the comparator circuit.

[0008] The timing circuit includes a charging circuit, a discharging circuit, and a first capacitor. The input terminal of the charging circuit is electrically connected to the output terminal of the comparator circuit, and the output terminal of the charging circuit is electrically connected to the positive plate of the first capacitor and the switching circuit. The input terminal of the discharging circuit is electrically connected to the positive plate of the first capacitor, and the output terminal of the discharging circuit is electrically connected to the output terminal of the comparator circuit and the switching circuit. Both the charging circuit and the discharging circuit have resistors.

[0009] The switching circuit is also electrically connected to the negative plate of the first capacitor and the voltage regulation feedback circuit.

[0010] The voltage regulation feedback circuit is also electrically connected to the power supply circuit.

[0011] Optionally, the voltage regulation feedback circuit includes an optocoupler and a voltage regulator, wherein the optocoupler is electrically connected to the switching circuit and the power supply circuit, respectively;

[0012] The voltage regulator is electrically connected to the output terminals of the optocoupler and the power supply circuit, respectively.

[0013] Optionally, the voltage regulator may include the TL431 model.

[0014] Optionally, the charging circuit includes a first resistor R36 and a second resistor R37;

[0015] The first end of the first resistor is electrically connected to the output terminal of the comparator circuit, and the second end of the first resistor is electrically connected to the first end of the second resistor.

[0016] The second end of the second resistor is electrically connected to the positive plate of the first capacitor and the switching circuit, respectively.

[0017] Optionally, the discharge circuit includes a first sub-circuit and a second sub-circuit;

[0018] The first sub-circuit includes a discharge diode D801, a third resistor R30 and a first resistor R36. The positive terminal of the discharge diode is electrically connected to the positive plate of the first capacitor, the negative terminal of the discharge diode is electrically connected to the first end of the third resistor, and the second end of the third resistor is electrically connected to the second end of the first resistor.

[0019] The second sub-circuit includes the second resistor and the first resistor.

[0020] Optionally, the timing circuit further includes a constant voltage diode, the anode of which is electrically connected to the cathode of the first capacitor, and the cathode of which is electrically connected to the second terminal of the first resistor.

[0021] Optionally, the timing circuit further includes a fourth resistor, which is connected in parallel with the first capacitor.

[0022] Optionally, the amplifier circuit includes a differential amplifier circuit;

[0023] The first input terminal of the differential amplifier circuit is electrically connected to the power supply circuit, the second input terminal of the differential amplifier circuit is grounded, and the output terminal of the differential amplifier circuit is electrically connected to the input terminal of the comparator circuit.

[0024] Optionally, the switching circuit includes a first switch, the first switch having a gate, a source, and a drain;

[0025] The gate is electrically connected to the charging circuit and the discharging circuit, the source is electrically connected to the negative plate of the first capacitor, and the drain is electrically connected to the voltage regulation feedback circuit.

[0026] According to another aspect of the present invention, a power supply circuit is provided, including a hiccup circuit and a power supply circuit. The hiccup circuit includes the hiccup circuit described above, and the power supply circuit includes an input filter rectifier circuit, a boost circuit, a flyback control circuit, and an output rectifier filter circuit that are electrically connected.

[0027] The hiccup circuit is electrically connected to both the flyback control circuit and the output rectifier filter circuit.

[0028] The beneficial effects of the technical solution provided by this utility model embodiment include at least the following:

[0029] This utility model provides a hiccup circuit including an amplification circuit, a comparator circuit, a timing circuit, a switching circuit, and a voltage regulation feedback circuit. The timing circuit includes a charging circuit, a discharging circuit, and a first capacitor. By adjusting the resistance values ​​in the charging circuit and the discharging circuit respectively, the charging and discharging times of the first capacitor can be adjusted, thereby independently controlling the on-time and off-time of the hiccup protection. This allows for flexible adjustment of the on-time and off-time of the hiccup protection, improving the applicability of the hiccup circuit. Furthermore, the combination of the amplification circuit and the comparator circuit allows for more precise control of the current entering the hiccup protection state. Amplifying the current allows for the use of a smaller current sensing resistor, thus reducing power consumption and improving efficiency. This solves the problem of low applicability of hiccup circuits in related technologies. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of a power supply circuit shown in an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of a hiccup circuit provided in an embodiment of the present invention;

[0033] Figure 3 yes Figure 1 A schematic diagram of the flyback control circuit in the power supply circuit shown.

[0034] Figure 4 yes Figure 1 A schematic diagram of the input filter and rectifier circuit in the power supply circuit shown.

[0035] Figure 5 yes Figure 1 A schematic diagram of the boost circuit in the power supply circuit shown.

[0036] Figure 6 yes Figure 1 The diagram shows the output rectifier and filter circuit in the power supply circuit. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0038] Although the present invention can be readily embodied in various forms, only some specific embodiments are shown in the accompanying drawings and will be described in detail in this specification. It is understood that this specification should be regarded as an exemplary illustration of the principles of the present invention and is not intended to limit the present invention to what is described herein.

[0039] Therefore, a feature pointed out in this specification is used to describe one feature of one embodiment of the present invention, and does not imply that every embodiment of the present invention must have the described feature. Furthermore, it should be noted that this specification describes many features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0040] Please refer to Figure 1 , Figure 1 This is a schematic diagram of a power supply circuit according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of a hiccup circuit 11 provided in an embodiment of the present invention. The hiccup circuit 11 may include: an amplifier circuit 11a, a comparator circuit 11b, a timing circuit 11c, a switching circuit 11d, and a voltage regulation feedback circuit 11e.

[0041] The input terminal of amplifier circuit 11a is electrically connected to the output terminal VREF of the power supply circuit in the power supply circuit, and the output terminal of amplifier circuit 11a is electrically connected to the input terminal of comparator circuit 11b. Amplifier circuit 11a amplifies the input signal (i.e., the output signal of the power supply circuit), so that comparator circuit 11b can compare the amplified input signal with a preset reference signal. Based on the comparison result, comparator circuit 11b outputs a high-level signal or a low-level signal to indicate whether the input signal exceeds or falls below the reference signal. By combining amplifier circuit 11a and comparator circuit 11b, the current entering hiccup protection can be more precisely controlled. Furthermore, after amplifying the current, a current sensing resistor with a smaller resistance can be used, thus reducing power consumption and improving efficiency.

[0042] The timing circuit 11c may include a charging circuit, a discharging circuit, and a first capacitor C25. The input terminal of the charging circuit is electrically connected to the output terminal of the comparator circuit 11b, and the output terminal of the charging circuit is electrically connected to the positive plate of the first capacitor C25 and the switching circuit 11d. The input terminal of the discharging circuit is electrically connected to the positive plate of the first capacitor C25, and the output terminal of the discharging circuit is electrically connected to the output terminal of the comparator circuit 11b and the switching circuit 11d. Both the charging circuit and the discharging circuit have resistors. For example, the resistance value in the charging circuit may be equal to or not equal to the resistance value in the discharging circuit, and the number of resistors in the charging circuit may be equal to or not equal to the number of resistors in the discharging circuit.

[0043] The switching circuit 11d is also electrically connected to the negative plate of the first capacitor C25 and the voltage regulation feedback circuit 11e. The switching circuit 11d is used to turn on or off according to the voltage output by the timing circuit 11c. The voltage regulation feedback circuit 11e is also electrically connected to the power supply circuit. The voltage regulation feedback circuit 11e is used to turn off or turn on the output of the power supply circuit according to the opening or closing of the switching circuit 11d.

[0044] For example, when an overcurrent occurs in the power supply circuit, such as when the output current of the power supply circuit is greater than 4A, the comparator circuit 11b can output a high level to charge the first capacitor C25. During the charging process, the switch circuit 11d is in the off state, the state of the voltage regulation feedback circuit 11e does not change, and the power supply circuit outputs normally. When the first capacitor C25 is fully charged, the switch circuit 11d changes from the off state to the on state, and the voltage regulation feedback circuit 11e shuts off the output of the power supply circuit. During this process, the time for maintaining the normal output of the power supply circuit is determined by the charging time of the charging circuit for the first capacitor C25.

[0045] When the first capacitor C25 begins to discharge, the switching circuit 11d remains in the on state for a preset time. At the same time, the power supply circuit is controlled by the voltage regulation feedback circuit 11e to remain in the off state for a preset time until, after the preset time, the discharge voltage of the first capacitor C25 is lower than the turn-on voltage of the switching circuit 11d. The switching circuit 11d then changes from the on state to the off state, and the power supply circuit is controlled by the voltage regulation feedback circuit 11e to resume normal output. During this process, the time for the power supply circuit to remain off is determined by the discharge time of the first capacitor C25 by the discharge circuit.

[0046] In this way, the charging time and discharging time of the first capacitor C25 can be adjusted separately by adjusting the resistance values ​​in the charging circuit and the discharging circuit, thereby controlling the on-time and off-time of the hiccup protection separately. The on-time and off-time of the hiccup protection can be flexibly adjusted to improve the applicability of the hiccup circuit 11.

[0047] In summary, this utility model embodiment provides a hiccup circuit 11 including an amplifier circuit 11a, a comparator circuit 11b, a timing circuit 11c, a switching circuit 11d, and a voltage regulation feedback circuit 11e. The timing circuit 11c includes a charging circuit, a discharging circuit, and a first capacitor C25. By adjusting the resistance values ​​in the charging circuit and the discharging circuit respectively, the charging and discharging times of the first capacitor C25 can be adjusted, thereby allowing for independent control of the on-time and off-time of the hiccup protection. This allows for flexible adjustment of the on-time and off-time of the hiccup protection, improving the applicability of the hiccup circuit 11. Furthermore, the combination of the amplifier circuit 11a and the comparator circuit 11b allows for more precise control of the current entering the hiccup protection state. Amplifying the current allows for the use of a current sensing resistor with a smaller resistance value, thus reducing power consumption and improving efficiency. This solves the problem of low applicability of hiccup circuits 11 in related technologies.

[0048] Please refer to Figure 1 , Figure 2 and Figure 3 , Figure 3 yes Figure 1The schematic diagram of the flyback control circuit 12 in the power supply circuit shown illustrates an optional embodiment where the voltage regulation feedback circuit 11e may include an optocoupler PC1A and a voltage regulator IC2. The optocoupler PC1A is electrically connected to both the switching circuit 11d and the power supply circuit; the voltage regulator IC2 is electrically connected to both the optocoupler PC1A and the output terminal of the power supply circuit. Optionally, the voltage regulator IC2 may be a TL431. The TL431 can work with the optocoupler PC1A to stabilize the output voltage. When the switching circuit 11d is on, pin 2 of the optocoupler PC1A can be pulled low, allowing the optocoupler PC1A to work with the optocoupler PC1B in the flyback control circuit 12 to shut down the power supply circuit output.

[0049] Please refer to Figure 2 In one optional embodiment, the charging circuit may include a first resistor R36 and a second resistor R37; the first end of the first resistor R36 is electrically connected to the output terminal of the comparator circuit 11b, and the second end of the first resistor R36 is electrically connected to the first end of the second resistor R37; the second end of the second resistor R37 is electrically connected to the positive plate of the first capacitor C25 and the switching circuit 11d, respectively. The charging time of the first capacitor C25 can be adjusted by adjusting the resistance value of the second resistor R37.

[0050] Please refer to Figure 2 In one optional embodiment, the discharge circuit may include a first sub-circuit and a second sub-circuit. The first sub-circuit includes a discharge diode D801, a third resistor R30, and a first resistor R36. The anode of the discharge diode D801 is electrically connected to the anode of the first capacitor C25, the cathode of the discharge diode D801 is electrically connected to the first terminal of the third resistor R30, and the second terminal of the third resistor R30 is electrically connected to the second terminal of the first resistor R36. The second sub-circuit includes a second resistor R37 and a first resistor R36. Due to the unidirectional conductivity of the discharge diode D801, the first sub-circuit in the discharge circuit can only conduct when the first capacitor C25 is discharging. Furthermore, the second resistor R37 can be reused as a resistor in the discharge circuit. That is, the first capacitor C25 can be discharged through the parallel connection of the first and second sub-circuits.

[0051] In an optional embodiment, the timing circuit 11c may further include a Zener diode DZ6 and a fourth resistor R33. The anode of the Zener diode DZ6 is electrically connected to the cathode of the first capacitor C25 and grounded, while the cathode of the Zener diode DZ6 is electrically connected to the second terminal of the first resistor R36. The Zener diode DZ6 can provide a stable voltage output in the circuit, maintaining a relatively stable output voltage even if the power supply voltage or load current changes within a certain range.

[0052] The fourth resistor R33 is connected in parallel with the first capacitor C25. The discharge time of the first capacitor C25 can be adjusted by adjusting the resistance value of the fourth resistor R33.

[0053] In one optional embodiment, amplifier circuit 11a includes a differential amplifier circuit; the first input terminal of the differential amplifier circuit is electrically connected to the power supply circuit, the second input terminal of the differential amplifier circuit is grounded, and the output terminal of the differential amplifier circuit is electrically connected to the input terminal of comparator circuit 11b. The differential amplifier circuit can suppress the common-mode signal (common-mode voltage between the two input terminals relative to ground) that coexists at both input terminals. Common-mode signals are typically caused by environmental interference or power supply noise. The differential amplifier circuit can extract the useful differential-mode signal and suppress common-mode noise, improving the accuracy of the output signal. Furthermore, the suppression of common-mode signals by the differential amplifier circuit can also improve the power supply rejection ratio and reduce the impact of power supply fluctuations on circuit performance.

[0054] In one alternative embodiment, the switching circuit 11d may include a first switch Q802, which has a gate, a source, and a drain; the gate is electrically connected to the charging circuit and the discharging circuit, the source is electrically connected to the negative plate of the first capacitor c25 and grounded, and the drain is electrically connected to the voltage regulation feedback circuit 11e.

[0055] Please refer to Figure 4 , Figure 5 and Figure 6 , Figure 4 yes Figure 1 The schematic diagram shows the input filter rectifier circuit 13 in the power supply circuit shown. Figure 5 yes Figure 1 The diagram shows the boost circuit 14 in the power supply circuit. Figure 6 yes Figure 1 The schematic diagram of the output rectifier and filter circuit 15 in the power supply circuit shown is provided in this embodiment of the present invention. The power supply circuit may include a hiccup circuit 11 and a power supply circuit. The hiccup circuit 11 includes the hiccup circuit 11 in any of the above embodiments. The power supply circuit includes an input filter rectifier circuit 13, a boost circuit 14, a flyback control circuit 12 and an output rectifier and filter circuit 15 that are electrically connected. The hiccup circuit 11 is electrically connected to the flyback control circuit 12 and the output rectifier and filter circuit 15 respectively.

[0056] The input filter rectifier circuit 13 can filter and rectify the input current of the circuit. Specifically, after the AC power is input, it passes through the fuse F1. The varistor VDR1 and the variable resistor RT1 in the input filter rectifier circuit 13 provide protection against lightning strikes and surges. The safety capacitor CX1, inductor LF1 and inductor LF2a in the input filter rectifier circuit 13 filter the current and improve the electromagnetic interference (EMI) performance of the current. The bridge rectifier circuit DBI can rectify the AC power into DC power.

[0057] The power factor can be improved by using the PFC boost circuit 14. For example, MOSFET Q1, diode D3, and inductor TR1 can form the BOOST boost circuit 14.

[0058] The flyback control circuit 12 may include a control chip LD7790GS (IC1), a MOSFET Q2, and a transformer TR2 forming a QR. The flyback control circuit 12 may include a quasi-resonant flyback topology circuit.

[0059] In the output rectifier and filter circuit 15, the MOSFET Q801 and the control chip IC801 can form an output synchronous rectifier circuit. The polarized capacitors CD3a and CD3b, the inductor L2, the polarized capacitor CD4 and the inductor LF3 can filter the circuit.

[0060] It is understood that in this embodiment of the present invention, the power supply circuit may also include multiple matching resistors, capacitors and inductors and other electronic components to ensure stable operation of the power supply circuit. This embodiment of the present invention will not elaborate on this.

[0061] In one exemplary embodiment, the power supply circuit in this utility model embodiment can be used for a printer. Since the printer's instantaneous startup power can reach more than three times the rated power, and the printer needs to ensure at least 2 seconds of maximum power printing time, by setting a charging circuit and a discharging circuit in the hiccup circuit 11 respectively, the hiccup time can be precisely controlled, thereby reducing the average power and improving the safety of the power supply circuit.

[0062] In this invention, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0063] In the several embodiments provided by this utility model, it should be understood that the disclosed apparatus and method can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0064] The above description is only an optional embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hiccup circuit, characterized in that, include: Amplifier circuits, comparator circuits, timing circuits, switching circuits, and voltage regulation feedback circuits; The input terminal of the amplifier circuit is electrically connected to the power supply circuit, and the output terminal of the amplifier circuit is electrically connected to the input terminal of the comparator circuit. The timing circuit includes a charging circuit, a discharging circuit, and a first capacitor. The input terminal of the charging circuit is electrically connected to the output terminal of the comparator circuit, and the output terminal of the charging circuit is electrically connected to the positive plate of the first capacitor and the switching circuit. The input terminal of the discharging circuit is electrically connected to the positive plate of the first capacitor, and the output terminal of the discharging circuit is electrically connected to the output terminal of the comparator circuit and the switching circuit. Both the charging circuit and the discharging circuit have resistors. The switching circuit is also electrically connected to the negative plate of the first capacitor and the voltage regulation feedback circuit. The voltage regulation feedback circuit is also electrically connected to the power supply circuit.

2. The hiccup circuit according to claim 1, characterized in that, The voltage regulation feedback circuit includes an optocoupler and a voltage regulator, wherein the optocoupler is electrically connected to the switching circuit and the power supply circuit respectively; The voltage regulator is electrically connected to the output terminals of the optocoupler and the power supply circuit, respectively.

3. The hiccup circuit according to claim 2, characterized in that, The voltage regulator model includes TL431.

4. The hiccup circuit according to claim 1, characterized in that, The charging circuit includes a first resistor and a second resistor; The first end of the first resistor is electrically connected to the output terminal of the comparator circuit, and the second end of the first resistor is electrically connected to the first end of the second resistor. The second end of the second resistor is electrically connected to the positive plate of the first capacitor and the switching circuit, respectively.

5. The hiccup circuit according to claim 4, characterized in that, The discharge circuit includes a first sub-circuit and a second sub-circuit; The first sub-circuit includes a discharge diode, a third resistor, and a first resistor. The positive terminal of the discharge diode is electrically connected to the positive plate of the first capacitor, the negative terminal of the discharge diode is electrically connected to the first end of the third resistor, and the second end of the third resistor is electrically connected to the second end of the first resistor. The second sub-circuit includes the second resistor and the first resistor.

6. The hiccup circuit according to claim 5, characterized in that, The timing circuit further includes a constant voltage diode, the anode of which is electrically connected to the cathode of the first capacitor, and the cathode of which is electrically connected to the second terminal of the first resistor.

7. The hiccup circuit according to claim 5, characterized in that, The timing circuit also includes a fourth resistor, which is connected in parallel with the first capacitor.

8. The hiccup circuit according to any one of claims 1 to 7, characterized in that, The amplifier circuit includes a differential amplifier circuit; The first input terminal of the differential amplifier circuit is electrically connected to the power supply circuit, the second input terminal of the differential amplifier circuit is grounded, and the output terminal of the differential amplifier circuit is electrically connected to the input terminal of the comparator circuit.

9. The hiccup circuit according to any one of claims 1 to 7, characterized in that, The switching circuit includes a first switch, which has a gate, a source, and a drain. The gate is electrically connected to the charging circuit and the discharging circuit, the source is electrically connected to the negative plate of the first capacitor, and the drain is electrically connected to the voltage regulation feedback circuit.

10. A power supply circuit, characterized in that, It includes a hiccup circuit and a power supply circuit. The hiccup circuit includes the hiccup circuit according to any one of claims 1-9. The power supply circuit includes an input filter rectifier circuit, a boost circuit, a flyback control circuit, and an output rectifier filter circuit that are electrically connected. The hiccup circuit is electrically connected to both the flyback control circuit and the output rectifier filter circuit.

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