CN213367630U - Power supply slow-start circuit and electronic equipment - Google Patents
Power supply slow-start circuit and electronic equipment Download PDFInfo
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- CN213367630U CN213367630U CN202021539651.5U CN202021539651U CN213367630U CN 213367630 U CN213367630 U CN 213367630U CN 202021539651 U CN202021539651 U CN 202021539651U CN 213367630 U CN213367630 U CN 213367630U
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Abstract
The disclosure relates to the technical field of power supplies, in particular to a power supply slow-start circuit and electronic equipment, wherein the power supply slow-start circuit comprises an input power supply, a constant current output module, an output switch, a detection control module and an external load; the constant current output module is connected with the input power supply; the constant current output module is connected between the external load and the input power supply and forms a closed loop with the external load and the input power supply; the output switch is connected between the input power supply and the external load and is connected with the constant current output module in parallel; the detection control module is connected with the constant current output module and the output switch and used for detecting input voltage and voltage at two ends of an external load and controlling the output switch according to the magnitude relation between the voltage at two ends of the external load and the input voltage. According to the technical scheme of the embodiment of the invention, the delay time is short, the constant current is delayed, and the safety of the circuit is ensured. The reliability of the product is improved.
Description
Technical Field
The disclosure relates to the technical field of power supplies, in particular to a power supply slow-start circuit and electronic equipment.
Background
With the development of various electronic devices, the application of power supply slow-start circuits is becoming more and more widely used.
In the prior art, a power supply slow-start circuit adopts an electric group to limit current and slow start, slow start current nonlinearity and long slow start time; when the power supply output is short-circuited, the slow-start current-limiting resistor can be burnt out; the output voltage detection function is not available, the output switch is also closed when the slow start fails, and large impact current occurs to cause circuit damage.
Therefore, it is necessary to design a new power supply slow-start circuit.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
SUMMERY OF THE UTILITY MODEL
The purpose of the present disclosure is to provide a power supply slow start circuit and device, a computer readable storage medium and an electronic device, so as to overcome the slow start current nonlinearity, slow start current nonlinearity and long slow start time in the prior art at least to a certain extent; when the power supply output is short-circuited, the slow-start current-limiting resistor can be burnt out; the output voltage detection function is not available, the output switch is also closed when the slow start fails, and large impact current occurs to cause circuit damage.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows, or in part will be obvious from the description, or may be learned by practice of the disclosure.
According to a first aspect of the present disclosure, there is provided a power supply slow-up circuit, including:
inputting a power supply;
the constant current output module is connected to the input power supply;
the external load is connected with the constant current output module and forms a closed loop with the input power supply and the constant current output module;
the output switch is connected between the input power supply and the external load and is connected with the constant current output module in parallel;
and the detection control module is connected with the constant current output module and the output switch and used for detecting input voltage and voltage at two ends of the external load and controlling the output switch according to the magnitude relation between the voltage at two ends of the external load and the input voltage.
In an exemplary embodiment of the present disclosure, the controlling the output switch according to a magnitude relationship between a voltage across the external load and the input voltage includes:
and when the ratio of the voltage at two ends of the external load to the input voltage is greater than or equal to a preset threshold value, controlling the output switch to be closed, and controlling the constant current output module to stop working.
In an exemplary embodiment of the present disclosure, the constant current output module includes:
a first switch element, a control end of which is connected to the detection control module, a first end of which is connected to the positive pole of the input power supply, and a second end of which is connected to a first node;
an inductive element having a first end connected to the first node;
the first end of the protection transistor is connected to the second end of the inductance element, and the second end of the protection transistor is connected to the external load;
and the first end of the follow current transistor is connected to the negative electrode of the input power supply, and the second end of the follow current transistor is connected to the first node.
In an exemplary embodiment of the present disclosure, the detection control module includes:
the first control circuit is used for generating a control signal according to the ratio of the voltage at two ends of the external load to the input voltage and a preset threshold value;
and the second control circuit is used for detecting the actual current of the constant current output module, generating a driving signal according to the error between the actual current and the target current, and controlling the first switching element according to the driving signal and the control signal.
In an exemplary embodiment of the present disclosure, the generating a control signal according to a magnitude between a ratio of a voltage across the external load to the input voltage and a preset threshold includes:
when the ratio of the voltage at two ends of the external load to the input voltage is smaller than a preset threshold value, generating a first control signal;
and when the ratio of the voltage at the two ends of the external load to the input voltage is greater than or equal to a preset threshold value, generating a second control signal.
In an exemplary embodiment of the present disclosure, controlling the first switching element according to the driving signal and the control signal includes:
and responding to the first control signal, and controlling the first switch unit to be opened or closed through the driving signal.
In an exemplary embodiment of the present disclosure, the first control circuit includes:
the comparator is used for comparing the ratio of the voltage at two ends of the external load to the input voltage with the preset threshold value and outputting a comparison signal;
the signal conversion module is connected with the comparator and used for generating a second control signal according to the comparison signal;
the first driving module is used for driving the output switch according to the second control signal;
and the output end is connected with the second control circuit and used for converting the comparison signal into a first control signal and transmitting the first control signal to the second control circuit.
In an exemplary embodiment of the present disclosure, the output terminal includes:
and the first end of the delay module is connected to the comparator, and the second end of the delay module is connected to the second control circuit.
In an exemplary embodiment of the present disclosure, the signal conversion module is a not gate.
In an exemplary embodiment of the present disclosure, the second control circuit includes:
the signal generation module is used for detecting the actual current of the constant current output module and generating a driving signal according to the error between the actual current and the target current;
the amplifier is connected with the signal generation module and used for amplifying and conditioning the driving signal;
the PWM module is connected with the amplifier and used for receiving the amplified and conditioned driving signal and generating a PWM signal;
and the second driving module receives the PWM signal and is used for controlling the first switching element according to the PWM signal and the first control signal.
In an exemplary embodiment of the present disclosure, the output switch includes:
and the control end of the second switch element is connected to the first drive module of the first control circuit, the first end of the second switch element is connected to the anode of the input power supply, and the second end of the second switch element is connected to the external load.
In an exemplary embodiment of the present disclosure, the external load includes a filter capacitor and a resistor, which are connected in parallel.
According to an aspect of the present disclosure, there is provided an electronic device including:
the power supply slow start circuit according to any one of the above.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:
the power supply slow-start circuit provided by the embodiment of the disclosure comprises an input power supply, a constant current output module, an external load, an output switch and a detection control module; the constant current output module is connected with the input power supply; the constant current output module is connected between the external load and the input power supply and forms a closed loop with the external load and the input power supply; the output switch is connected between the input power supply and the external load and is connected with the constant current output module in parallel; the detection control module is connected with the constant current output module and the output switch and used for detecting input voltage and voltage at two ends of an external load and controlling the output switch according to the magnitude relation between the voltage at two ends of the external load and the input voltage. Compared with the prior art, the constant-current output module and the external load are connected in series to form a loop, so that the voltage of the external load, namely the output voltage of the constant-current output module, is linearly increased, the delay time is short, the constant current is delayed, the output switch is turned on after the output voltage and the input voltage are ensured to be at the preset threshold value, the problem of delay failure when the load changes and the load is abnormal is effectively solved, the safety of a circuit is guaranteed, and the reliability of a product is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty. In the drawings:
FIG. 1 schematically illustrates a schematic diagram of a power supply slow-down circuit in an exemplary embodiment of the disclosure;
FIG. 2 schematically illustrates a circuit schematic of a power supply slow-down circuit in an exemplary embodiment of the disclosure;
FIG. 3 schematically illustrates a schematic diagram of a first control circuit in an exemplary embodiment of the present disclosure;
fig. 4 schematically illustrates a schematic diagram of a second control circuit in an exemplary embodiment of the present disclosure.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.
In the present exemplary embodiment, firstly, a power supply slow-start circuit is provided, and as shown in fig. 1, the power supply slow-start circuit includes an input power supply 110, a constant current output module 120, an external load 150, an output switch 130, and a detection control module 140; the constant current output module 120 is connected to the input power supply 110; the constant current output module 120 is connected between the external load 150 and the input power supply 110, and forms a closed loop with the external load 150 and the input power supply 110; the output switch 130 is connected between the input power source 110 and the external load 150, and is connected in parallel with the constant current output module 120; the detection control module 140 is connected to the constant current output module 120 and the output switch 130, and is configured to detect an input voltage and a voltage across the external load 150, and control the output switch 130 according to a magnitude relationship between the voltage across the external load 150 and the input voltage.
Compared with the prior art, the constant current output module 120 and the external load 150 are connected in series to form a loop, so that the voltage of the external load 150, namely the output voltage of the constant current output module 120, is linearly increased, the delay time is short, the constant current is delayed, the output switch 130 is turned on after the output voltage and the input voltage are ensured to be at the preset threshold value, the problem of delay failure when the load changes and the load is abnormal is effectively solved, and the safety of the circuit is ensured. The reliability of the product is improved.
In an example embodiment of the present disclosure, the input power source 110 is a dc power source, and the usage scenario of the power source slow-start circuit is customized according to the input voltage of the input power source 110, which is not specifically limited in this example embodiment.
In the present exemplary embodiment, referring to fig. 2, the constant current output module 120 is connected to the input power source 110, and the constant current output module 120 may include a first switching element K1, an inductance element, a protection transistor D2, and a freewheel transistor D1.
The first switch element K1 may be a switch transistor having a control terminal, a first terminal, and a second terminal. Specifically, the control terminal of the switching transistor may be a gate, the first terminal may be a source, and the second terminal may be a drain; or the control terminal of the switching transistor may be a gate, the first terminal may be a drain, and the second terminal may be a source. In addition, the switching transistor may be an enhancement transistor or a depletion transistor, and this exemplary embodiment is not particularly limited thereto. The switching transistor may be an N-type transistor or a P-type transistor, which is not particularly limited in the present exemplary embodiment. The first switching element K1 may have a control terminal connected to the detection control module 140, a first terminal connected to the positive terminal of the input power source 110, and a second terminal connected to the first node Q.
In this exemplary embodiment, the inductance element includes a first terminal and a second terminal, wherein the first terminal may be connected to the first node Q, the second terminal may be connected to the protection transistor D2, and the impedance of the inductance element may be customized according to the voltage of the input power source 110, which is not specifically limited in this exemplary embodiment.
In the present exemplary embodiment, the protection transistor D2 may be a diode, and includes a first terminal and a second terminal, the first terminal is connected to the second terminal of the above-mentioned inductive element, the second terminal is connected to the external load 150, wherein the protection transistor D2 is forward-conducting from the first terminal to the second terminal. The freewheel transistor D1 also includes a first terminal connected to the negative terminal of the input power source 110 and a second terminal connected to the first node Q, and the freewheel transistor D1 may be a diode and may be turned on in the forward direction from the first terminal to the second terminal.
In an example embodiment of the present disclosure, the detection control module 140 may include a first control circuit and a second control circuit, the first control circuit generating a first control signal SS _ EN when a ratio of a voltage across the external load 150 to an input voltage is less than a preset threshold; and generating a second control signal when the ratio of the voltage across the external load 150 to the input voltage is greater than or equal to a preset threshold. The second control circuit is configured to detect the actual current IL of the constant current output module 120, generate a driving signal according to an error between the actual current IL and the target current IR, and control the first switching element K1 according to the driving signal in response to the first control signal SS _ EN.
In this example embodiment, referring to fig. 3, the first control circuit may include a comparator 310, a signal conversion module, a first driving module 320, and an output terminal, where the comparator 310 is configured to compare a ratio of a voltage across the external load 150 to the input voltage with the preset threshold and output a comparison signal. The preset threshold may be 0.95, 0.96, or the like, and may also be customized according to requirements, which is not specifically limited in this example embodiment.
In the present exemplary embodiment, the comparator 310 may operate by inputting a product of the input voltage and the preset threshold and a voltage across an external load, i.e., a load voltage, comparing the product of the input voltage and the preset threshold with a magnitude of the load voltage, and outputting a comparison signal, where the comparison signal may be 0 or 1.
In this exemplary embodiment, the signal conversion module may be an inverter, which is connected to the comparator 310 and is configured to convert the comparison signal into a second control signal and transmit the second control signal to the first driving module 320, and the first driving module 320 drives the output switch 130 according to the second control signal.
In this example, the output terminal is connected to the comparator 310 and the second control circuit, and is used for converting the comparison signal into the first control signal SS _ EN and transmitting the first control signal SS _ EN to the second control circuit. The output end may include a delay module 330, and the delay module 330 is connected to the comparator 310 and the second control circuit, where the delay module 330 may be a fixed delay module 330, and the delay time may be 0.1 second, 0.2 second, and the like, which is not limited in this exemplary embodiment.
In this example embodiment, referring to fig. 4, the second control circuit may include a signal generating module 410, an amplifier 420, a PWM module 430, and a second driving module 440, where the signal generating module 410 is configured to detect an actual current IL of the constant current output module 120 and generate a driving signal according to an error between the actual current IL and a target current IR, and the amplifier 420 is connected to the signal generating module 410 and configured to amplify the conditioning driving signal; the PWM module 430 is connected to the amplifier 420, and is configured to receive the amplified and conditioned driving signal and generate a PWM signal; the second driving module 440 receives the PWM signal and controls the first switching element K1 according to the PWM signal and the first control signal SS _ EN.
In the present example embodiment, the output switch 130 includes a second switching element K2, wherein the second switching element K2 may be switching transistors each having a control terminal, a first terminal, and a second terminal. Specifically, the control terminal of the switching transistor may be a gate, the first terminal may be a source, and the second terminal may be a drain; or the control terminal of the switching transistor may be a gate, the first terminal may be a drain, and the second terminal may be a source. In addition, the switching transistor may be an enhancement transistor or a depletion transistor, which is not particularly limited in the present exemplary embodiment.
In the present exemplary embodiment, the control terminal of the second switching element K2 is connected to the first driving module 320 of the first control circuit, the first terminal is connected to the positive electrode of the input power source 110, and the second terminal is connected to the external load 150.
In the present exemplary embodiment, the external load 150 may include a filter capacitor and a resistor disposed in parallel.
In the present exemplary embodiment, the product of the input voltage and the preset threshold is input to the positive electrode of the comparator 310, the voltage value across the external load 150 is input to the negative electrode of the comparator 310, when the product of the input voltage and the preset threshold is greater than or equal to the voltage value across the external load 150, the output signal of the comparator 310 is 1, the signal input to the driving module through the not-gate conversion is 0, that is, the first driving module 320 does not work, but the signal input to the delay module 330 is 1. At this time, the second control circuit controls the first switching element K1 so that the current of the constant current output module 120 is stabilized within the threshold range.
Specifically, the signal generating module 410 detects the actual current IL of the inductance element, detects an error between the actual current IL and the target current IR, generates a driving signal, the driving signal is amplified by the amplifier 420, and generates a PWM signal by the PWM module 430, and transmits the PWM signal to the second driving module 440, when the actual current IL is greater than the target current IR, the second controlling module controls the first switching element K1 to be turned on, the actual current IL is reduced by the flywheel diode, and when the actual current IL is less than the target current IR, the second controlling module controls the first switching element to be turned on, and the actual current IL is increased. The actual current IL is controlled to be the same as the target current IR within the threshold range by the PWM signal as described above.
When the product of the input voltage and the preset threshold is smaller than the voltage value at the two ends of the external load 150, which is the output signal of the comparator 310 is 0, the signal input to the driving module through the not-gate conversion is 1, that is, the first driving module 320 works, the first driving module 320 drives the second switching element K2 to be closed, the constant current input module stops working, and the slow start of the power supply is completed.
The present disclosure also provides a new electronic device, which may include the above power supply slow-up circuit, and the specific details of the power supply slow-up circuit have been described in detail above, and therefore, are not described herein again.
In this example real-time approach, the electronic device may be a motor driver, a medical device, or the like. For example, an X-ray machine, the electronic device is not particularly limited in this exemplary embodiment.
In this specification, the terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising," "including," and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.; the terms "first," "second," and "third," etc. are used merely as labels, and are not limiting on the number of their objects.
It is to be understood that the invention is not limited in its application to the details of construction and the arrangement of components set forth in the description. The present invention is capable of other embodiments and of being practiced and carried out in a variety of ways. The foregoing variations and modifications fall within the scope of the present invention. It will be understood that the invention disclosed and defined in this specification extends to all alternative combinations of two or more of the individual features mentioned or evident from the text and/or drawings. All of these different combinations constitute various alternative aspects of the present invention. The embodiments set forth herein explain the best modes known for practicing the invention and will enable others skilled in the art to utilize the invention.
Claims (13)
1. A power supply slow start circuit, comprising:
inputting a power supply;
the constant current output module is connected to the input power supply;
the external load is connected with the constant current output module and forms a closed loop with the input power supply and the constant current output module;
the output switch is connected between the input power supply and the external load and is connected with the constant current output module in parallel;
and the detection control module is connected with the constant current output module and the output switch and used for detecting input voltage and voltage at two ends of the external load and controlling the output switch according to the magnitude relation between the voltage at two ends of the external load and the input voltage.
2. The power supply slow-start circuit according to claim 1, wherein the controlling the output switch according to the magnitude relationship between the voltage across the external load and the input voltage comprises:
and when the ratio of the voltage at two ends of the external load to the input voltage is greater than or equal to a preset threshold value, controlling the output switch to be closed, and controlling the constant current output module to stop working.
3. The power supply slow-start circuit according to claim 1 or 2, wherein the constant current output module comprises:
a first switch element, a control end of which is connected to the detection control module, a first end of which is connected to the positive pole of the input power supply, and a second end of which is connected to a first node;
an inductive element having a first end connected to the first node;
the first end of the protection transistor is connected to the second end of the inductance element, and the second end of the protection transistor is connected to the external load;
and the first end of the follow current transistor is connected to the negative electrode of the input power supply, and the second end of the follow current transistor is connected to the first node.
4. The power ramp circuit of claim 3, wherein the detection control module comprises:
the first control circuit is used for generating a control signal according to the ratio of the voltage at two ends of the external load to the input voltage and a preset threshold value;
and the second control circuit is used for detecting the actual current of the constant current output module, generating a driving signal according to the error between the actual current and the target current, and controlling the first switching element according to the driving signal and the control signal.
5. The power supply slow-start circuit according to claim 4, wherein the generating a control signal according to a magnitude between a ratio of a voltage across the external load to the input voltage and a preset threshold comprises:
when the ratio of the voltage at two ends of the external load to the input voltage is smaller than a preset threshold value, generating a first control signal;
and when the ratio of the voltage at the two ends of the external load to the input voltage is greater than or equal to a preset threshold value, generating a second control signal.
6. The power supply slow-start circuit according to claim 5, wherein controlling the first switching element in accordance with the drive signal and the control signal comprises:
and responding to the first control signal, and controlling the first switch unit to be opened or closed through the driving signal.
7. The power supply slow-start circuit according to any one of claims 4 to 6, wherein the first control circuit comprises:
the comparator is used for comparing the ratio of the voltage at two ends of the external load to the input voltage with the preset threshold value and outputting a comparison signal;
the signal conversion module is connected with the comparator and used for generating a second control signal according to the comparison signal;
the first driving module is used for driving the output switch according to the second control signal;
and the output end is connected with the second control circuit and used for converting the comparison signal into a first control signal and transmitting the first control signal to the second control circuit.
8. The power supply droop circuit of claim 7, wherein said output comprises:
and the first end of the delay module is connected to the comparator, and the second end of the delay module is connected to the second control circuit.
9. The power up buffer circuit of claim 7, wherein the signal conversion module is a not gate.
10. The power supply slow-start circuit according to any one of claims 4 to 6, wherein the second control circuit comprises:
the signal generation module is used for detecting the actual current of the constant current output module and generating a driving signal according to the error between the actual current and the target current;
the amplifier is connected with the signal generation module and used for amplifying and conditioning the driving signal;
the PWM module is connected with the amplifier and used for receiving the amplified and conditioned driving signal and generating a PWM signal;
and the second driving module receives the PWM signal and is used for controlling the first switching element according to the PWM signal and the first control signal.
11. The power supply slow-start circuit according to any one of claims 4 to 6, wherein the output switch comprises:
and the control end of the second switch element is connected to the first drive module of the first control circuit, the first end of the second switch element is connected to the anode of the input power supply, and the second end of the second switch element is connected to the external load.
12. The power supply slow-start circuit according to claim 1, wherein the external load comprises a filter capacitor and a resistor arranged in parallel.
13. An electronic device, comprising:
the power ramp circuit of any of claims 1-12.
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| CN202021539651.5U CN213367630U (en) | 2020-07-29 | 2020-07-29 | Power supply slow-start circuit and electronic equipment |
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| CN202021539651.5U CN213367630U (en) | 2020-07-29 | 2020-07-29 | Power supply slow-start circuit and electronic equipment |
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