CN112055936B - Control discharge circuit, switching power supply and control discharge equipment - Google Patents
Control discharge circuit, switching power supply and control discharge equipment Download PDFInfo
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- CN112055936B CN112055936B CN202080002376.XA CN202080002376A CN112055936B CN 112055936 B CN112055936 B CN 112055936B CN 202080002376 A CN202080002376 A CN 202080002376A CN 112055936 B CN112055936 B CN 112055936B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
- H02M1/092—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices the control signals being transmitted optically
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/322—Means for rapidly discharging a capacitor of the converter for protecting electrical components or for preventing electrical shock
Abstract
A discharge control circuit, a switching power supply and a discharge control device are provided. The control discharge circuit includes: the photoelectric coupler comprises a control circuit (101), a photoelectric coupler (102) and a discharge circuit (103), wherein the photoelectric coupler (102) comprises an input end and an output end, the discharge circuit (103) comprises a first discharge circuit (104) and a second discharge circuit (105), the input end of the control circuit (101) is external input voltage, and the control circuit (101) is used for controlling the output duration and the output interval duration of output voltage according to the external input voltage; the input end of the photoelectric coupler (102) is connected with the output end of the control circuit (101), the output end of the photoelectric coupler (102) is connected with the first discharge circuit (104), and the first discharge circuit (104) is connected with the second discharge circuit (105). The discharge circuit has the advantages of stability, reliability and high safety.
Description
Technical Field
The application relates to the technical field of circuit structures, in particular to a discharge control circuit, a switching power supply and discharge control equipment.
Background
The filter capacitor is usually arranged in equipment powered by high voltage, when the equipment is not powered, the filter capacitor is still provided with high voltage, if a human body is accidentally touched to cause electric shock, the high voltage on the filter capacitor must be discharged to be below 36v safe voltage which can be borne by the human body in the safety requirement, a passive discharge circuit or an active discharge circuit is usually used, the passive discharge circuit is generally used, a resistor with large resistance value is directly connected in parallel to the filter capacitor for discharging, the discharge time is long, and the voltage is discharged to be below 36v for several minutes. The active discharge is generally performed by outputting a signal to drive a relay or a semiconductor device such as a MOSFET or a triode when discharge is required, connecting a capacitor to a resistor with a small resistance, and discharging the voltage on the capacitor to below 36v in a short time.
However, if there is a problem with the circuit that outputs the discharge signal, three situations may occur: 1. the discharging signal is always output, the discharging resistance is always connected in parallel to the filter capacitor, and due to the fact that the discharging resistance is small, under the condition that the equipment is powered by high voltage, the resistance can be quickly burnt due to overheating, even nearby objects can be burnt out, energy can be consumed, and accordingly low efficiency and abnormal operation of the equipment are caused. 2. No discharge signal is output all the time, and in this case, the filter capacitor can have high voltage after the power failure of the equipment, and if a human body is accidentally touched, the danger of electric shock can be caused. 3. The discharge signal is sometimes not present, and this is a combination of the two cases, and there is a possibility that the discharge is not discharged but is discharged.
As described above, although the conventional technology can realize the discharge function, there are a series of problems to be solved, and the reliability is not high enough.
Disclosure of Invention
The embodiment of the application discloses a control discharge circuit, a switching power supply and a control discharge device, which can improve the reliability and safety of the discharge circuit.
In a first aspect, an embodiment of the present application provides a discharge control circuit, including:
the photoelectric coupler comprises an input end and an output end, the discharge circuit comprises a first discharge circuit and a second discharge circuit, the input end of the control circuit is connected with an external input voltage, and the control circuit is used for controlling the output duration and the output interval of the output voltage according to the external input voltage;
the input end of the photoelectric coupler is connected with the output end of the control circuit, the output end of the photoelectric coupler is connected with the first discharge circuit, and the first discharge circuit is connected with the second discharge circuit.
Based on the first aspect, in one optional implementation manner, the control circuit includes a first logic gate circuit, a second logic gate circuit, a comparator circuit, a first resistor, a second resistor, a third resistor, a fourth resistor, and a first capacitor, where:
the first input end and the second input end of the first logic gate circuit are connected and are connected with an external input discharge signal and one end of the first resistor, the output end of the first logic gate circuit is connected with one end of the second resistor and the first input end of the second logic gate circuit, the other end of the second resistor is connected with the first input end of the comparator circuit and one end of the first capacitor, the second input end of the comparator circuit is connected with one end of the third resistor and one end of the fourth resistor, the output end of the comparator circuit is connected with the second input end of the second logic gate circuit, and the output end of the second logic gate circuit is connected with the input end of the photoelectric coupler;
the other end of the first resistor, the other end of the first capacitor, the other end of the third resistor, the third input end of the comparator and the third input end of the second logic gate circuit are all grounded, and the other end of the fourth resistor, the fourth input end of the comparator and the fourth input end of the second logic gate circuit are all connected with a voltage-stabilized power supply.
Based on the first aspect, in an optional implementation manner, the control circuit further includes a fifth resistor, one end of the fifth resistor is connected to the output end of the second logic gate circuit, and the other end of the fifth resistor is connected to the input end of the photoelectric coupler.
Based on the first aspect, in one optional implementation manner, the first discharge circuit includes a sixth resistor, a seventh resistor, and a zener diode, where:
one end of the voltage stabilizing diode is connected with one end of the sixth resistor, one end of the seventh resistor and one end of the second discharging circuit respectively, the other end of the voltage stabilizing diode is connected with the other end of the sixth resistor, and the other end of the seventh resistor is connected with the other end of the second discharging circuit.
Based on the first aspect, in one optional implementation manner, the first discharging circuit further includes a second capacitor, one end of the second capacitor is connected to one end of the zener diode, one end of the sixth resistor, and one end of the seventh resistor, respectively, and the other end of the second capacitor is connected to the other end of the zener diode and the other end of the sixth resistor, respectively.
Based on the first aspect, in one optional implementation manner, the second discharge circuit includes a first transistor, a second transistor, an eighth resistor, a ninth resistor, a tenth resistor, and a third capacitor, where:
one end of the eighth resistor is connected with the output end of the photoelectric coupler, the other end of the eighth resistor is connected with the first electrode of the first transistor, the second electrode of the first transistor is connected with one end of the ninth resistor, the third electrode of the first transistor is connected with one end of a voltage stabilizing diode of the first discharge circuit, the other end of the ninth resistor is connected with the first electrode of the second transistor, the second electrode of the second transistor is connected with one end of the tenth resistor, the other end of the tenth resistor is respectively connected with one end of the third capacitor and the other end of the seventh resistor of the first discharge circuit, and the third electrode of the second transistor is connected with the other end of the third capacitor.
Based on the first aspect, in one optional implementation manner, the second discharge circuit includes a third transistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fourth capacitor, and a fifth capacitor, where:
one end of the eleventh resistor is connected to an output end of the photocoupler, the other end of the eleventh resistor is connected to one end of the fifth capacitor and one end of the twelfth resistor, the other end of the fifth capacitor is connected to one end of the thirteenth resistor and the first electrode of the third transistor, the second electrode of the third transistor is connected to one end of the fourteenth resistor, the third electrode of the third transistor is connected to one end of the fourth capacitor, the other end of the fourteenth resistor is connected to the other end of the fourth capacitor and one end of the first discharge circuit, and the other end of the twelfth resistor is connected to the other end of the thirteenth resistor and the other end of the first discharge circuit.
In an optional implementation manner according to the first aspect, the first transistor, the second transistor, and the third transistor include, but are not limited to, one or more of a triode, an insulated gate bipolar transistor, and a field effect transistor.
In a second aspect, an embodiment of the present application provides a switching power supply, which includes the control discharge circuit of the first aspect.
In a third aspect, an embodiment of the present application provides a control discharge device, which includes the control discharge circuit described in the first aspect.
According to the control discharge circuit, the switching power supply and the control discharge equipment, a discharge voltage signal passes through the control circuit, the values of a second resistor and a first capacitor in the control circuit determine a discharge output interval, the values of a third resistor and a fourth resistor determine discharge output duration, and when the control circuit outputs a low level, the discharge voltage signal cannot continue to discharge even though the discharge voltage signal exists; when the control circuit outputs high level, the photoelectric coupler is driven to be conducted, the photoelectric coupler drives the first transistor to be conducted, the second transistor is conducted, and therefore electricity stored in the capacitor is released through the tenth resistor and the second transistor, and discharging reliability and safety are guaranteed.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a discharge control circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a control circuit for controlling a discharge circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a first discharge circuit for controlling a discharge circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a second discharge circuit for controlling a discharge circuit according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.
It is to be understood that the terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein may be combined with other embodiments.
The terms "comprising" and "having," and any variations thereof, as appearing in the specification, claims and drawings of the present application, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus. Furthermore, the terms "first," "second," and "third," etc. are used to distinguish between different objects and are not used to describe a particular order.
It should also be understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
The following provides a partial description of the components required in the embodiments of the present application:
photoelectric coupler: also called photoelectric isolator, optical coupler, short optical coupler. The photoelectric coupler is an electric-to-optical-to-electric converter for transmitting electric signals by using light as a medium. It is composed of two parts of luminous source and light receiver. The light source and the light receiver are assembled in the same closed shell and are isolated from each other by a transparent insulator. The pin of the light source is an input end, the pin of the light receiver is an output end, the common light source is a light emitting diode, and the light receiver is a photosensitive diode, a phototriode and the like.
A transistor: generally, the term "semiconductor material-based" refers to any single component, including diodes, transistors, fets, thyristors, etc., made of various semiconductor materials. A transistor is a solid semiconductor device and has a plurality of functions such as detection, rectification, amplification, switching, voltage stabilization, signal modulation, and the like. The transistor, which is a type of variable current switch, is capable of controlling an output current based on an input voltage. Unlike common mechanical switches (such as Relay and switch), the transistor utilizes an electrical signal to control the on/off of the transistor, and the switching speed can be very fast, and the switching speed in a laboratory can reach more than 100 GHz. In embodiments of the present application, the transistor may include one or more of a triode, an insulated gate bipolar transistor, and a field effect transistor.
A logic gate circuit: basic components on an integrated circuit. A simple logic gate may be comprised of transistors. The combination of these transistors may cause the high and low levels representing both signals to produce a high or low level signal after passing through them. The high and low levels may represent logical "true" and "false" or 1 and 0 in binary, respectively, to implement a logical operation. Common logic gates include and gates, or gates, not gates, xor gates (also called exclusive or gates), and so on.
A comparator circuit: the comparator circuit is a circuit that compares an analog voltage signal with a reference voltage. The two paths of input of the comparator are analog signals, the output is binary signals 0 or 1, and when the difference value of the input voltage is increased or decreased and the positive sign and the negative sign are unchanged, the output is kept constant.
The following is a detailed description with reference to the drawings.
Fig. 1 is a schematic structural diagram of a discharge control circuit according to an embodiment of the present disclosure, and as shown in fig. 1, the discharge control circuit includes: the control circuit comprises a control circuit 101, a photoelectric coupler 102 and a discharge circuit 103, wherein the photoelectric coupler 102 comprises an input end and an output end, the discharge circuit 103 comprises a first discharge circuit 104 and a second discharge circuit 105, the input end of the control circuit 101 is connected with an external input voltage, and the control circuit is used for controlling the output duration and the output interval of the output voltage according to the input external input voltage; the input end of the photoelectric coupler 102 is connected to the output end of the control circuit 101, the output end of the photoelectric coupler 102 is connected to the first discharge circuit 104, and the first discharge circuit 104 is connected to the second discharge circuit 105.
Optionally, the control circuit 101 includes a first logic gate circuit U1, a second logic gate circuit U2, a comparator circuit U3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a first capacitor C1, wherein a first input terminal and a second input terminal of the first logic gate circuit U1 are connected and connected to an external input discharge signal and one terminal of the first resistor R1, an output terminal a of the first logic gate circuit U1 and one terminal of the second resistor R2 and a first input terminal D of the second logic gate circuit U2 are connected, the other terminal of the second resistor R2 is connected to a first input terminal B of the comparator circuit U3 and one terminal of the first capacitor C1, a second input terminal C of the comparator circuit U3 and one terminal of the third resistor R3 and one terminal of the fourth resistor R4 are connected, an output terminal of the comparator circuit U3 and a second input terminal E of the second logic gate circuit U2 are connected to an output terminal E2 of the photo-coupler circuit U36102, the other end of the first resistor R1, the other end of the first capacitor C1, the other end of the third resistor R3, the third input end of the comparator circuit U3 and the third input end of the second logic gate circuit U2 are all grounded, and the other end of the fourth resistor R4, the fourth input end of the comparator circuit U3 and the fourth input end of the second logic gate circuit U2 are all connected with a voltage-stabilized power supply.
Specifically, in the above-mentioned control circuit 101, the discharge signal may first pass through an and gate U1 (first logic gate U1), wherein the first logic gate U1 may also use other gates with similar functions, after the driving capability is enhanced as a whole, the output signal of the output terminal a of the and gate U1 is divided into two paths from point a, and one path is sent to the point D of the first input terminal of the and gate U2 (second logic gate U2), wherein the second logic gate U2 may also use other gates with similar functions, the other path of output is sent to the point B of the inverting input pin of the comparator circuit U3 (the first input terminal B of the comparator circuit U3) after passing through the second resistor R2 and the first capacitor C1, the voltage at the point B of the inverting input pin of the comparator circuit U3 is raised slowly due to the existence of the second resistor R2 and the first capacitor C1, while the voltage at the point C of the forward input pin of the comparator circuit U3 (the second input terminal C of the comparator circuit U3) is obtained by dividing the voltage VCC by the voltage R35r 3527 and the voltage R3527, therefore, when the point a outputs a high level, the point B voltage rises slowly, when the point B voltage is less than the point C voltage, the comparator circuit U3 outputs a high level to the point E of the input pin of the and gate U2 (the second input terminal E of the second logic gate circuit U2), when the point B voltage is greater than the point C voltage, the output terminal of the comparator circuit U3 outputs a low level to the point E, that is, the and gate U2 outputs a high level only when the two input terminals D, E of the and gate U2 are both high level, otherwise, the and gate U2 outputs a low level. The photocoupler 102 is only turned on when the output of the and gate U2 is high, and the photocoupler 102 is not turned on when the output of the and gate U2 is low.
Optionally, as shown in fig. 2, the control circuit 101 may further include a fifth resistor R5, one end of the fifth resistor R5 is connected to the output end of the second logic gate U2, and the other end of the fifth resistor R5 is connected to the input end of the photocoupler 102. Wherein, the fifth resistor R5 is used for voltage division.
Optionally, as shown in fig. 1, the first discharge circuit 104 includes a sixth resistor R6, a seventh resistor R7, and a zener diode ZD1, wherein one end of the zener diode ZD1 is connected to one end of the sixth resistor R6, one end of the seventh resistor R7, and one end of the second discharge circuit 105, the other end of the zener diode ZD1 is connected to the other end of the sixth resistor R6, and the other end of the seventh resistor R7 is connected to the other end of the second discharge circuit 105.
Specifically, the first discharge circuit 104 may be regarded as a passive discharge circuit, and when the second discharge circuit 105 fails, the first discharge circuit 104 may also implement a discharge function. The voltage between the sixth resistor R6 and the seventh resistor R7 is maintained at about 15V by the voltage division of the sixth resistor R6 and the seventh resistor R7, and the values of the seventh resistor R7 and the zener diode ZD1 determine the current of the passive discharge. The sixth resistor R6 is used for ensuring the resistance of the passive discharge circuit when the zener diode ZD1 is in fault open circuit, if the sixth resistor R6 is not used, the zener diode ZD1 is in open circuit and then the passive discharge circuit fails, the second transistor Q2 in the first discharge circuit 104 can bear high voltage and is easy to damage, and after the R6 is increased, when the ZD1 is in open circuit, the passive discharge circuit can be realized through the R6 and the R7, so that the reliability of the circuit is ensured.
Optionally, as shown in fig. 3, the first discharging circuit 104 may further include a second capacitor C2, one end of the second capacitor C2 is connected to one end of the zener diode ZD1, one end of the sixth resistor R6, and one end of the seventh resistor R7, respectively, and the other end of the second capacitor C2 is connected to the other end of the zener diode ZD1 and the other end of the sixth resistor R6, respectively. The second capacitor C2 is used for filtering out interference signals.
Optionally, as shown in fig. 1, the second discharge circuit 105 includes a first transistor Q1, a second transistor Q2, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, and a third capacitor C3, one end of the eighth resistor R8 is connected to the output end of the photocoupler 102, the other end of the eighth resistor R8 is connected to the first electrode of the first transistor Q1, the second electrode of the first transistor Q1 is connected to one end of the ninth resistor R9, the third electrode of the first transistor Q1 is connected to one end of the zener diode ZD1 of the first discharge circuit 104, the other end of the ninth resistor R9 is connected to the first electrode of the second transistor Q2, the second electrode of the second transistor Q2 is connected to one end of the tenth resistor R10, the other end of the tenth resistor R10 is connected to one end of the third capacitor C3 and the other end of the seventh resistor R7 of the first discharge circuit 104, and the third electrode of the second transistor Q2 is connected to the other end of the third capacitor C3.
Specifically, the second discharge circuit 105 can be regarded as an active discharge circuit, and if the first transistor Q1 and the second transistor Q2 are field effect transistors, the first electrode is a gate, the second electrode is a drain, and the third electrode is a source; if the first transistor Q1 and the second transistor Q2 are insulated gate bipolar transistors, the first electrode is a gate electrode, the second electrode is a collector electrode, and the third electrode is an emitter electrode; if the first transistor Q1 and the second transistor Q2 are triodes, the first electrode is a base electrode, the second electrode is a collector electrode, and the third electrode is an emitter electrode; after the photoelectric coupler 102 is turned on, the first transistor Q1 is driven, the first transistor Q1 is turned on, the 15V voltage at the point F passes through the ninth resistor R9 after passing through the first transistor Q1, and then the second transistor Q2 is driven, and after the second transistor Q2 is turned on, the electricity stored in the high-voltage filter capacitor C3 is discharged through the tenth resistor R10 and the second transistor Q2, so that the discharge purpose is achieved. The voltage of the point F is provided by R6 and R7 voltage dividing circuits. It will be appreciated that 15V is an exemplary reference value.
The work flow of the discharge control circuit provided by the embodiment of the application comprises three conditions, specifically as follows:
in the first case, when there is no externally input discharge voltage signal at the input terminal of the control circuit, the input of the first logic gate circuit U1 is low, the output point a is also low, the point a is divided into two paths, one path is to the point D of the first input terminal of the second logic gate circuit U2, and the other path passes through the second resistor R2 and the first capacitor C1 and enters the point B of the inverting input terminal of the comparator circuit U3, since the point C of the forward input terminal of the comparator circuit U3 is high, and the point C voltage is greater than the point B voltage, the comparator circuit U3 outputs high, the two points E of the two input terminals of the second logic gate circuit U2 are high, the point D is low, the second logic gate circuit U2 outputs low, the photocoupler 102 is non-conductive, and the second transistor Q2 and the first transistor Q1 are also non-conductive and do not discharge.
In the second case, when the input terminal of the control circuit has the externally input discharge voltage signal, the first input terminal and the second input terminal of the first logic gate circuit U1 are both at high level, the first logic gate circuit U1 outputs high level (point a), one path of the high level is applied to the point D of the first input terminal of the second logic gate circuit U2, the other path of the high level is applied to the point B of the inverting input terminal of the comparator circuit U3 after passing through the second resistor R2 and the first capacitor C1, the voltage rises slowly, when the point B voltage does not rise above the point C (point B voltage < point C voltage), the comparator circuit U3 outputs high level, both input terminals of the second logic gate circuit U2 are at high level, the second logic gate circuit U2 outputs high level, the photocoupler 102 is turned on, the second transistor Q2 and the first transistor Q1 are turned on, the power on the third capacitor C3 (high voltage filter capacitor) is turned on by the tenth resistor R10, The second transistor Q2 is bleeding. With the lapse of time, the output of the first logic gate circuit U1 continuously charges the first capacitor C1 through the second resistor R2, the voltage on the first capacitor C1 gradually increases, that is, the voltage at the point B continuously increases, when the voltage at the point B increases and exceeds the voltage at the point C, the comparator circuit U3 reverses its state, outputs a low level, the point E changes to a low level, at this time, the two input ends of the second logic gate circuit U2 are respectively at a high level (point D) and a low level (point E), the second logic gate circuit U2 outputs a low level, the photocoupler 102 is not conductive, the second transistor Q2 and the first transistor Q1 are not conductive, and the discharging is stopped, and at this time, if the discharging voltage signal still exists continuously, the discharging is not continued.
In the third case, after the externally input discharge voltage signal at the input terminal of the control circuit is stopped, the first logic gate circuit U1 outputs a low level, the voltage across the first capacitor C1 is discharged to the first logic gate circuit U1 through the second resistor R2, the voltage finally becomes 0V, the circuit is reset, and the next discharge is performed after waiting for the input of the next discharge voltage signal.
From the working principle of the circuit, even if a continuous discharge voltage signal is input all the time due to a fault, the control discharge circuit of the embodiment of the application only executes a discharge operation for a period of time, and does not discharge all the time along with the discharge voltage signal, so that the reliability of discharge is ensured. The values of R2, C1, R3 and R4 determine the discharge time, when the values are all larger, the discharge time is longer, and when the values are all smaller, the discharge time is shorter; and the values of R2 and C1 also determine the time interval for allowing the first discharge and the second discharge, and if the values of R2 and C1 are both large, the time interval is longer, otherwise, the time interval is shorter. R10 is an active discharge resistor, and the voltage on C3 can be reduced to below the safe voltage 36V at different time by selecting different resistance values.
In another embodiment, as shown in fig. 4, the second discharge circuit 105 may include a third transistor Q3, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fourth capacitor C4, and a fifth capacitor C5, one end of an eleventh resistor R11 is connected to the output end of the photocoupler 102, the other end of the eleventh resistor R11 is connected to one end of a fifth capacitor C5 and one end of a twelfth resistor R12, the other end of the fifth capacitor C5 is connected to one end of a thirteenth resistor R13 and a first electrode of a third transistor Q3, a second electrode of the third transistor Q3 is connected to one end of a fourteenth resistor R14, a third electrode of the third transistor Q3 is connected to one end of a fourth capacitor C4, the other end of the fourteenth resistor R14 is connected to the other end of the fourth capacitor C4 and one end of the first discharge circuit 104, and the other end of the twelfth resistor R12 is connected to the other end of the thirteenth resistor R13 and the other end of the first discharge circuit 104.
Specifically, if the third transistor Q3 is a field effect transistor, the first electrode is a gate, the second electrode is a drain, and the third electrode is a source; if the third transistor Q3 is an insulated gate bipolar transistor, the first electrode is a gate electrode, the second electrode is a collector electrode, and the third electrode is an emitter electrode; if the third transistor Q3 is a triode, the first electrode is a base electrode, the second electrode is a collector electrode, and the third electrode is an emitter electrode; after the photoelectric coupler 102 is turned on, the discharge signal passes through the eleventh resistor R11 and the fifth capacitor C5 to turn on the third transistor Q3, which is also a charging process of the fifth capacitor C5, and after the third transistor Q3 is turned on, the electricity on the high-voltage filter capacitor is discharged through the fourteenth resistor R14 and the third transistor Q3; when the fifth capacitor C5 is fully charged, no signal passes through the fifth capacitor C5, that is, the third transistor Q3 receives no driving signal, the third transistor Q3 is turned off, and the discharging is stopped, so that the third transistor Q3 is not turned on and the discharging is not continued even if the discharging signal is continuously input. When the discharging signal stops being input, the electricity on the fifth capacitor C5 is discharged through the thirteenth resistor R13 and the twelfth resistor R12, and only when the discharging signal is input again after the electricity on the fifth capacitor C5 is discharged, the discharging circuit discharges the fourth capacitor C4 (high-voltage filter capacitor) again, so that the control of discharging is ensured.
The embodiment of the application also provides a switching power supply device which comprises the discharge control circuit provided by any application embodiment. The control discharge circuit in the switching power supply device is the same as the control discharge circuit described in any of the embodiments of the above-mentioned application, and will not be described here.
The embodiment of the application also provides a discharge control device, and the discharge control device comprises the discharge control circuit provided by any one of the embodiments of the application. The control discharge circuit in the control discharge device is the same as the control discharge circuit described in any of the embodiments of the above-mentioned application, and will not be described here.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and can include the processes of the embodiments of the methods described above when the computer program is executed. And the aforementioned storage medium includes: a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the above-described circuit may be divided into only one type of logic function, and may be implemented in other ways, for example, multiple circuits or components may be combined or integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or circuits, and may be in an electrical or other form.
While the invention has been described with reference to specific embodiments, the scope of the invention is not limited thereto, and those skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application. While the present application has been described herein in conjunction with various embodiments, other variations to the disclosed embodiments may be understood and effected by those skilled in the art in practicing the present application as claimed herein.
Claims (8)
1. A controlled discharge circuit, comprising: the control circuit comprises a first logic gate circuit and a first resistor, wherein the first input end and the second input end of the first logic gate circuit are connected and are connected with an external input discharge signal and one end of the first resistor; the input end of the control circuit is connected with an external input voltage; the control circuit is used for controlling the output duration and the output interval of the output voltage according to the external input voltage;
the input end of the photoelectric coupler is connected with the output end of the control circuit, the output end of the photoelectric coupler is connected with the first discharge circuit, and the first discharge circuit is connected with the second discharge circuit;
the second discharge circuit comprises a third transistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fourth capacitor and a fifth capacitor, wherein:
one end of the eleventh resistor is connected to an output end of the photocoupler, the other end of the eleventh resistor is connected to one end of the fifth capacitor and one end of the twelfth resistor, the other end of the fifth capacitor is connected to one end of the thirteenth resistor and the first electrode of the third transistor, the second electrode of the third transistor is connected to one end of the fourteenth resistor, the third electrode of the third transistor is connected to one end of the fourth capacitor, the other end of the fourteenth resistor is connected to the other end of the fourth capacitor and one end of the first discharge circuit, and the other end of the twelfth resistor is connected to the other end of the thirteenth resistor and the other end of the first discharge circuit.
2. The circuit of claim 1, wherein the control circuit further comprises: second logic gate circuit, comparator circuit, second resistance, third resistance, fourth resistance and first electric capacity, wherein:
the output end of the first logic gate circuit is connected with one end of the second resistor and the first input end of the second logic gate circuit, the other end of the second resistor is connected with the first input end of the comparator circuit and one end of the first capacitor, the second input end of the comparator circuit is connected with one end of the third resistor and one end of the fourth resistor, the output end of the comparator circuit is connected with the second input end of the second logic gate circuit, and the output end of the second logic gate circuit is connected with the input end of the photoelectric coupler;
the other end of the first resistor, the other end of the first capacitor, the other end of the third resistor, the third input end of the comparator circuit and the third input end of the second logic gate circuit are all grounded, and the other end of the fourth resistor, the fourth input end of the comparator circuit and the fourth input end of the second logic gate circuit are all connected with a voltage-stabilized power supply.
3. The circuit of claim 2, wherein the control circuit further comprises a fifth resistor, one end of the fifth resistor is connected to the output terminal of the second logic gate circuit, and the other end of the fifth resistor is connected to the input terminal of the photocoupler.
4. The circuit of claim 1, wherein the first discharge circuit comprises a sixth resistor, a seventh resistor, and a zener diode, wherein:
one end of the voltage stabilizing diode is connected with one end of the sixth resistor, one end of the seventh resistor and one end of the second discharging circuit respectively, the other end of the voltage stabilizing diode is connected with the other end of the sixth resistor, and the other end of the seventh resistor is connected with the other end of the second discharging circuit.
5. The circuit according to claim 4, wherein the first discharging circuit further comprises a second capacitor, one end of the second capacitor is connected to one end of the zener diode, one end of the sixth resistor, and one end of the seventh resistor, respectively, and the other end of the second capacitor is connected to the other end of the zener diode and the other end of the sixth resistor, respectively.
6. The circuit of claim 1, wherein the third transistor comprises but is not limited to one or more of a triode, an insulated gate bipolar transistor, and a field effect transistor.
7. A switching power supply unit, characterized in that it comprises a controlled discharge circuit according to any of claims 1-6.
8. A controlled discharge device comprising the controlled discharge circuit of any one of claims 1 to 6 or the switching power supply apparatus of claim 7.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2020/072011 WO2021142619A1 (en) | 2020-01-14 | 2020-01-14 | Discharge control circuit, switching power supply, and discharge control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112055936A CN112055936A (en) | 2020-12-08 |
| CN112055936B true CN112055936B (en) | 2022-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202080002376.XA Active CN112055936B (en) | 2020-01-14 | 2020-01-14 | Control discharge circuit, switching power supply and control discharge equipment |
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| Country | Link |
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| CN (1) | CN112055936B (en) |
| WO (1) | WO2021142619A1 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2021142619A1 (en) | 2021-07-22 |
| CN112055936A (en) | 2020-12-08 |
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