Power supply control circuit

Abstract

The embodiment of the utility model discloses a power supply control circuit. The power supply control circuit comprises a driving module, wherein the output end of the driving module is electrically connected with a power supply; the first end of the capacitor module is electrically connected with the power supply end of the driving module, and the second end of the capacitor module is grounded; the first end of the resistor module is electrically connected with the second end of the capacitor module; the first end of the switch module is electrically connected with the power supply end of the driving module, and the second end of the switch module is electrically connected with the second end of the resistor module; and the control module is electrically connected with the control end of the switch module and is used for receiving a control instruction and controlling the working state of the driving module by controlling the on-off of the switch module according to the control instruction so as to control the working state of the power supply. The power supply control circuit provided by the embodiment of the utility model can ensure continuous turn-off of the power supply.

Description

Technical Field

[0001] The embodiment of the utility model relates to power supply control technology, and in particular to a power supply control circuit. Background Art

[0002] Power supplies such as switching power supplies are used to control the on-off time ratio of a switch tube to maintain a stable output voltage. They are small, light and highly efficient and are widely used in a variety of electronic devices. The working state of a switching power supply needs to be controlled by a control circuit.

[0003] At present, the existing power supply control circuit usually stops the power supply from working by lowering the power supply driving signal during over-current and over-voltage protection, but the power supply will still restart again. If the power supply input voltage is always present, the power supply will always be in a hiccup state. In addition, the power supply is also shut down through an external shutdown circuit, for example, by lowering the feedback pin voltage, but the power supply will still automatically restart, and it is impossible to ensure that the power supply is continuously shut down. Utility Model Content

[0004] The embodiment of the utility model provides a power control circuit to ensure that the power is continuously turned off.

[0005] The present invention provides a power supply control circuit, comprising:

[0006] A driving module, wherein an output end of the driving module is electrically connected to a power source;

[0007] A capacitor module, wherein a first end of the capacitor module is electrically connected to a power supply end of the driving module, and a second end of the capacitor module is grounded;

[0008] a resistor module, wherein a first end of the resistor module is electrically connected to a second end of the capacitor module;

[0009] a switch module, wherein a first end of the switch module is electrically connected to a power supply end of the driving module, and a second end of the switch module is electrically connected to a second end of the resistance module;

[0010] The control module is electrically connected to the control end of the switch module, and is used to receive a control instruction, and control the working state of the drive module by controlling the on-off of the switch module according to the control instruction, so as to control the working state of the power supply.

[0011] Optionally, the capacitor module includes a first capacitor, and two ends of the first capacitor serve as a first end and a second end of the capacitor module respectively.

[0012] Optionally, the capacitor module further includes a second capacitor, one end of the second capacitor is electrically connected to the feedback end of the driving module, and the other end of the second capacitor is grounded.

[0013] Optionally, the resistance module includes at least one resistor, and two ends of the resistor serve as a first end and a second end of the resistance module respectively.

[0014] Optionally, the switch module includes a first switch, and a first end, a second end and a control end of the first switch serve as the first end, the second end and the control end of the switch module respectively.

[0015] Optionally, the switch module further includes a second switch, a first end and a control end of the second switch are electrically connected to the feedback end of the driving module and the control module respectively, and a second end of the second switch is grounded.

[0016] Optionally, the control module includes a controller, an input end of the controller receives the control instruction, and an output end of the controller is electrically connected to a control end of the switch module.

[0017] Optionally, the switch in the switch module is a transistor.

[0018] Optionally, the power supply is a switching power supply.

[0019] Optionally, the output voltage of the power supply is less than the input voltage or greater than the input voltage.

[0020] The power control circuit provided by the embodiment of the utility model includes: a driving module, the output end of the driving module is electrically connected to the power supply; a capacitor module, the first end of the capacitor module is electrically connected to the power supply end of the driving module, and the second end of the capacitor module is grounded; a resistor module, the first end of the resistor module is electrically connected to the second end of the capacitor module; a switch module, the first end of the switch module is electrically connected to the power supply end of the driving module, and the second end of the switch module is electrically connected to the second end of the resistor module; a control module, which is electrically connected to the control end of the switch module, and the control module is used to receive a control instruction, and according to the control instruction, the working state of the driving module is controlled by controlling the on-off of the switch module to control the working state of the power supply. The power control circuit provided by the embodiment of the utility model controls the on-off of the switch module through the control module. When the control module controls the switch module to be turned on, the driving module has no drive signal output, and the power supply does not work, that is, it is turned off, and when the control module controls the switch module to be continuously turned on, the driving module has no drive signal output continuously, and the power supply is continuously turned off, thereby solving the problem that the power supply cannot be continuously turned off and ensuring that the power supply is continuously turned off. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural block diagram of a power supply control circuit provided by an embodiment of the utility model;

[0022] Figure 2 It is a structural schematic diagram of a power supply control circuit provided by an embodiment of the utility model;

[0023] Figure 3 It is a structural schematic diagram of another power supply control circuit provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0025] Figure 1 This is a structural block diagram of a power supply control circuit provided by an embodiment of the utility model. Figure 2 Schematic diagram of a power supply control circuit provided by an embodiment of the utility model. Figure 1 and Figure 2 , the power control circuit includes: a driving module IC, a capacitor module 10, a resistor module 20, a switch module 30 and a control module 40. Among them, the output terminal OUT of the driving module IC is electrically connected to the power supply 50; the first end of the capacitor module 10 is electrically connected to the power supply terminal VDD of the driving module IC, and the second end of the capacitor module 10 is grounded; the first end of the resistor module 20 is electrically connected to the second end of the capacitor module 10; the first end of the switch module 30 is electrically connected to the power supply terminal VDD of the driving module IC, and the second end of the switch module 30 is electrically connected to the second end of the resistor module 20; the control module 40 is electrically connected to the control end of the switch module 30, and the control module 40 is used to receive a control instruction, and according to the control instruction, the working state of the driving module is controlled by controlling the on and off of the switch module 30 to control the working state of the power supply 50.

[0026] Specifically, the capacitor module 10 can stabilize and filter the power supply terminal VDD of the driver module IC. The driver module IC provides a driving signal for the power supply. When the driver module IC has a driving signal output, the power supply 50 works. When the driver module IC has no driving signal output, the power supply 50 does not work. When the control module 40 receives a control instruction that the power supply needs to be turned off, the output level signal controls the on and off of the switch module 30. For example, when the control terminal of the switch module 30 is at a high level, the switch module 30 is controlled to be turned on. When the control terminal of the switch module 30 is at a low level, the switch module 30 is controlled to be turned off; or, when the control terminal of the switch module 30 is at a low level, the switch module 30 is turned on. When the control terminal of the switch module 30 is at a high level, the switch module 30 is turned off. Further, when the control module 40 controls the switch module 30 to be turned off, the power supply terminal VDD of the driver module IC is disconnected from the path of the resistor module 20, and the voltage of the power supply terminal VDD of the driver module IC is greater than zero. At this time, the driver module IC has a driving signal output, and the power supply 50 is in a working state and is not turned off. When the control module 40 controls the switch module 30 to be turned on, the power supply terminal VDD of the driver module IC is grounded through the resistor module 20, and the voltage of the power supply terminal VDD of the driver module IC gradually drops to zero. At this time, the driver module IC has no drive signal output, and the power supply 50 is converted from a working state to a non-working state, that is, turned off. In addition, when the control module 40 controls the switch module 30 to be continuously turned on, the driver module IC continues to have no drive signal output, and the power supply 50 is continuously turned off, thereby solving the problem that the power supply 50 cannot be continuously turned off, and ensuring that the power supply is continuously turned off.

[0027] The power control circuit provided in this embodiment includes: a driving module, the output end of the driving module is electrically connected to the power supply; a capacitor module, the first end of the capacitor module is electrically connected to the power supply end of the driving module, and the second end of the capacitor module is grounded; a resistor module, the first end of the resistor module is electrically connected to the second end of the capacitor module; a switch module, the first end of the switch module is electrically connected to the power supply end of the driving module, and the second end of the switch module is electrically connected to the second end of the resistor module; a control module, which is electrically connected to the control end of the switch module, and the control module is used to receive a control instruction, and according to the control instruction, the control module controls the working state of the driving module by controlling the on and off of the switch module to control the working state of the power supply. The power control circuit provided in this embodiment controls the on and off of the switch module through the control module. When the control module controls the switch module to be turned on, the driving module has no drive signal output, and the power supply does not work, that is, it is turned off, and when the control module controls the switch module to be continuously turned on, the driving module has no drive signal output continuously, and the power supply is continuously turned off, thereby solving the problem that the power supply cannot be continuously turned off and ensuring that the power supply is continuously turned off.

[0028] refer to Figure 2Optionally, the capacitor module 10 includes a first capacitor C1, and the two ends of the first capacitor C1 serve as the first end and the second end of the capacitor module 10, respectively. The first capacitor C1 can stabilize and filter the power supply terminal VDD of the driving module IC, and the capacitance of the first capacitor C1 can be a capacitance of μF level, and the specific size can be determined according to the actual circuit requirements, which is not limited here.

[0029] Figure 3 Schematic diagram of another power supply control circuit provided by the embodiment of the utility model. Figure 3 Optionally, the capacitor module 10 further includes a second capacitor C2, one end of which is electrically connected to the feedback terminal COMP of the driver module IC, and the other end of the second capacitor C2 is grounded. The second capacitor C2 can stabilize and filter the feedback terminal COMP of the driver module IC, and the capacitance of the second capacitor C2 can be nF level, and the specific size can be determined according to the actual circuit requirements, which is not limited here.

[0030] refer to Figure 2 and Figure 3 Optionally, the resistance module 20 includes at least one resistor R1, and two ends of the resistor R1 serve as a first end and a second end of the resistance module 20 respectively.

[0031] For example, Figure 2 and Figure 3 As shown, the resistance module 20 includes a resistor R1. When the switch module 30 is turned on, the power supply terminal VDD of the driving module IC is grounded through the resistor R1, and the voltage of the power supply terminal VDD of the driving module IC gradually drops to zero. In addition, the resistance module 20 may include a plurality of resistors connected in series, and the total resistance value of the resistance module 20 is in the KΩ level. The specific value can be determined according to the actual circuit requirements and is not limited here.

[0032] refer to Figure 2 and Figure 3 Optionally, the switch module 30 includes a first switch K1 , and a first end, a second end and a control end of the first switch K1 serve as a first end, a second end and a control end of the switch module 30 , respectively.

[0033] Specifically, the control module 40 controls the on and off of the first switch K1 by transmitting a level signal to the control end of the first switch K1. For example, when the control end of the first switch K1 is at a high level, the first switch K1 is turned on, the switch module 30 is turned on, and when the control end of the first switch K1 is at a low level, the first switch K1 is turned off, and the switch module 30 is turned off; or, when the control end of the first switch K1 is at a low level, the first switch K1 is turned on, the switch module 30 is turned on, and when the control end of the first switch K1 is at a high level, the first switch K1 is turned off, and the switch module 30 is turned off. Exemplarily, the control module 40 controls the first switch K1 to be turned on by transmitting a high level signal to the control end of the first switch K1, and continuously transmits a high level signal to control the first switch K1 to be continuously turned on, thereby controlling the power supply 50 to be continuously turned off. When the power supply 50 does not need to be continuously turned off, the control module 40 transmits a low level signal to the control end of the first switch K1 to control the first switch K1 to be turned off, so that the power supply 50 can be converted from the off state to the working state.

[0034] refer to Figure 3 Optionally, the switch module 30 further includes a second switch K2, a first end and a control end of the second switch K2 are electrically connected to the feedback end COMP of the driving module IC and the control module 40 respectively, and a second end of the second switch is grounded.

[0035] Specifically, the control module 40 controls the on and off of the second switch K2 by transmitting a level signal to the control end of the second switch K2. For example, when the control end of the second switch K2 is at a high level (at this time, the control end of the first switch K1 is also at a high level), the second switch K2 is turned on (at this time, the first switch K1 is also turned on), and when the control end of the second switch K2 is at a low level (at this time, the control end of the first switch K1 is also at a low level), the second switch K2 is turned off (at this time, the first switch K1 is also turned off); or, when the control end of the second switch K2 is at a low level (at this time, the control end of the first switch K1 is also at a low level), the second switch K2 is turned on (at this time, the first switch K1 is also turned on), the control end of the second switch K2 is at a high level (at this time, the control end of the first switch K1 is also at a high level), and the second switch K2 is turned off (at this time, the first switch K1 is also turned off). Exemplarily, the control module 40 controls the second switch K2 to be turned on by transmitting a high-level signal to the control terminal of the second switch K2, and the feedback terminal COMP of the driving module IC is grounded through the second switch K2. At this time, the driving module IC has no driving signal output, and the power supply 50 is turned off. In addition, the first switch K1 and the second switch K2 are turned on and off at the same time, so as to further ensure that the power supply 50 is continuously turned off when the first switch K1 and the second switch K2 are turned on at the same time.

[0036] Optionally, the control module 40 includes a controller, an input end of the controller receives a control instruction, and an output end of the controller is electrically connected to a control end of the switch module. Specifically, the controller controls the working state of the switch module according to the control instruction. The specific control process can refer to the above specific control process, which will not be repeated here.

[0037] Optionally, the switch in the switch module 30 is a triode, wherein the base, the first pole and the second pole of the triode are respectively used as the control end, the first end and the second end of the switch module 30, and the switch type is only illustrated here for illustration, and can be determined according to actual circuit requirements, and is not limited here.

[0038] Optionally, the output voltage VOUT of the power supply 50 is less than the input voltage VIN or greater than the input voltage VIN. Specifically, the power supply 50 can be a boost power supply or a buck power supply, which can be determined according to actual power supply requirements and is not limited here.

[0039] Optionally, the power supply is a switching power supply.

[0040] Specifically, Figure 2 and Figure 3 As shown, the switching power supply includes components such as a transformer, a switch tube, a diode, a resistor and a capacitor. The voltage across the capacitor is the output voltage VOUT. The output terminal OUT of the driver module IC is electrically connected to the control terminal of the switch tube in the switching power supply through a resistor. The output terminal OUT of the driver module IC outputs a level signal to control the on and off of the switch tube. The on and off of the switch tube, such as a transistor, a field effect tube or a thyristor, enables the switch tube to pulse modulate the input voltage, thereby realizing DC / AC, DC / DC voltage conversion, as well as adjustable output voltage and automatic voltage regulation. In addition, the switching power supply includes a DC switching power supply and an AC switching power supply. The DC switching power supply converts the original ecological power supply (coarse power) with poor power quality, such as the mains power supply or the battery power supply, into a DC voltage (fine power) with higher quality that meets the requirements of the equipment. The core of the DC switching power supply is the DC / DC converter. The DC / DC converter can be divided into an isolated DC / DC converter and a non-isolated DC / DC converter. When achieving electrical isolation between output and input, isolated DC / DC converters usually use transformers. Since transformers have the function of voltage transformation, it is beneficial to expand the output application range of the converter and also facilitate the realization of multiple outputs of different voltages or multiple outputs of the same voltage.

[0041] Furthermore, the switching power supply has three working modes: fixed frequency and pulse width mode, fixed frequency and variable pulse width mode, and variable frequency and pulse width mode. The former working mode is mostly used for DC / AC inverter power supply or DC / DC voltage conversion; the latter two working modes are mostly used for switching voltage regulator power supply. In addition, the output voltage of the switching power supply also has three working modes: direct output voltage mode, average value output voltage mode, and amplitude output voltage mode. Similarly, the former working mode is mostly used for DC / AC inverter power supply or DC / DC voltage conversion; the latter two working modes are mostly used for switching voltage regulator power supply. According to the way the switching device is connected in the circuit, the switching power supply can be divided into three categories: series switching power supply, parallel switching power supply, and transformer switching power supply. Among them, the transformer switching power supply can be further divided into push-pull, half-bridge, full-bridge, etc.; according to the excitation of the transformer and the phase of the output voltage, it can be divided into forward, flyback, single-excitation and dual-excitation, etc.; it can be divided into more types according to the purpose. Moreover, the switching power supply has the characteristics of high frequency, high reliability, low consumption and low noise, and is widely used in industrial automation control, military equipment, scientific research equipment, LED lighting, industrial control equipment, communication equipment, power equipment, instrumentation, medical equipment, semiconductor refrigeration and heating, air purifiers, electronic refrigerators, LCD monitors, LED lamps, communication equipment, audio-visual products, security monitoring, LED light strips, computer cases, digital products and instruments. The high frequency of the switching power supply makes the switching power supply miniaturized, so that the switching power supply enters a wider range of application fields, especially in the field of high-tech, which promotes the development of the switching power supply. The switching power supply is developing in the direction of light, small, thin, low noise, high reliability and anti-interference. And modularization is the overall trend of the development of the switching power supply. Modular power supplies can be used to form a distributed power supply system, which can be designed as an N+1 redundant power supply system, and the capacity expansion of the parallel mode can be realized. In addition, the development and application of the switching power supply are of great significance in saving energy, saving resources and protecting the environment.

[0042] The power control circuit provided in this embodiment includes: a driving module, the output end of the driving module is electrically connected to the power supply; a capacitor module, the first end of the capacitor module is electrically connected to the power supply end of the driving module, and the second end of the capacitor module is grounded; a resistor module, the first end of the resistor module is electrically connected to the second end of the capacitor module; a switch module, the first end of the switch module is electrically connected to the power supply end of the driving module, and the second end of the switch module is electrically connected to the second end of the resistor module; a control module, which is electrically connected to the control end of the switch module, and the control module is used to receive a control instruction, and according to the control instruction, the working state of the driving module is controlled by controlling the on and off of the switch module to control the working state of the power supply. In addition, the capacitor module includes a first capacitor, and the two ends of the first capacitor are respectively used as the first end and the second end of the capacitor module; the capacitor module also includes a second capacitor, one end of the second capacitor is electrically connected to the feedback end of the driving module, and the other end of the second capacitor is grounded; the switch module includes a first switch, and the first end, the second end and the control end of the first switch are respectively used as the first end, the second end and the control end of the switch module; the switch module also includes a second switch, and the first end and the control end of the second switch are respectively electrically connected to the feedback end of the driving module and the control module, and the second end of the second switch is grounded. The power control circuit provided in this embodiment controls the on and off of each switch in the switch module through the control module. When the control module controls each switch to be turned on, the drive module has no drive signal output, and the power supply does not work, that is, it is turned off. When the control module controls each switch to be continuously turned on, the drive module continuously has no drive signal output, and the power supply is continuously turned off, thereby solving the problem that the power supply cannot be continuously turned off and ensuring that the power supply is continuously turned off.

[0043] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A power control circuit, characterized in that: include: A driving module, wherein an output end of the driving module is electrically connected to a power source; A capacitor module, wherein a first end of the capacitor module is electrically connected to a power supply end of the driving module, and a second end of the capacitor module is grounded; a resistor module, wherein a first end of the resistor module is electrically connected to a second end of the capacitor module; a switch module, wherein a first end of the switch module is electrically connected to a power supply end of the driving module, and a second end of the switch module is electrically connected to a second end of the resistance module; The control module is electrically connected to the control end of the switch module, and is used to receive a control instruction, and control the working state of the drive module by controlling the on-off of the switch module according to the control instruction, so as to control the working state of the power supply.

2. The power control circuit according to claim 1, characterized in that: The capacitor module includes a first capacitor, and two ends of the first capacitor serve as a first end and a second end of the capacitor module respectively.

3. The power control circuit according to claim 2, characterized in that: The capacitor module further includes a second capacitor, one end of which is electrically connected to the feedback end of the driving module, and the other end of which is grounded.

4. The power control circuit according to claim 1, characterized in that: The resistor module includes at least one resistor, and two ends of the resistor serve as a first end and a second end of the resistor module respectively.

5. The power control circuit according to claim 1, characterized in that: The switch module comprises a first switch, wherein a first end, a second end and a control end of the first switch respectively serve as a first end, a second end and a control end of the switch module.

6. The power control circuit according to claim 5, characterized in that: The switch module further includes a second switch, a first end and a control end of the second switch are electrically connected to the feedback end of the driving module and the control module respectively, and a second end of the second switch is grounded.

7. The power control circuit according to claim 1, characterized in that: The control module includes a controller, an input end of the controller receives the control instruction, and an output end of the controller is electrically connected to a control end of the switch module.

8. The power control circuit according to claim 1, characterized in that: The switch in the switch module is a triode.

9. The power control circuit according to claim 1, characterized in that: The power supply is a switching power supply.

10. The power control circuit according to claim 1, characterized in that: The output voltage of the power supply is lower than the input voltage or higher than the input voltage.

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