CN206805342U - A kind of sequential control circuit - Google Patents
A kind of sequential control circuit Download PDFInfo
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- CN206805342U CN206805342U CN201720497708.1U CN201720497708U CN206805342U CN 206805342 U CN206805342 U CN 206805342U CN 201720497708 U CN201720497708 U CN 201720497708U CN 206805342 U CN206805342 U CN 206805342U
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Abstract
The utility model embodiment provides a kind of sequential control circuit, it is connected between AC power and power supply control chip, the circuit includes voltage detection unit, power cut off delay unit, delayed unit, fault control unit, power control unit and short-circuit unit.Wherein, voltage detection unit is connected with AC power；Power cut off delay unit is connected with voltage detection unit；Delayed unit is connected with voltage detection unit；Fault control unit is connected with power cut off delay unit and delayed unit；Power control unit is connected with delayed unit and power supply control chip；Short-circuit unit is connected with the fault control unit.Implement the utility model embodiment, the SECO to suppressing resistance can be achieved, prevent circuit damage during quick startup or shut-off from suppressing resistance, extend the service life for suppressing resistance, improve the reliability of circuit.
Description
Technical Field
The utility model relates to the field of electronic technology, especially, relate to a sequential control circuit.
Background
In the application of the switching power supply, when the power supply is started, the input voltage can charge a capacitor of a circuit, the capacitor is equivalent to a short circuit, the starting current is equivalent to the input voltage divided by the impedance of a backflow path, and the brought impact current is very large and can bring influence to a power grid. Therefore, a surge current is generally suppressed by connecting a suppression resistor in series with the return path. However, in high power applications, the input current is relatively large during normal operation, which tends to cause the suppression resistor to generate heat. In order to improve the reliability of the circuit, the suppression resistor is short-circuited after the circuit is turned on to prevent the suppression resistor from being burned. In the existing design, in the process of frequent and rapid starting and stopping of a circuit, the suppression resistor is normally only short-circuited after the circuit is started, and the short circuit of the suppression resistor is directly cut off after the circuit is stopped, so that the suppression resistor is easily damaged. Therefore, the short circuit of the suppression resistor in the circuit needs to be controlled in time sequence to improve the service life of the suppression resistor and ensure the normal operation of the circuit.
SUMMERY OF THE UTILITY MODEL
The utility model provides a sequential control circuit that reliability is high, circuit connection is between alternating current power supply and power control chip, the circuit includes:
the voltage detection unit is connected with the alternating current power supply and used for receiving the input voltage of the alternating current power supply and outputting a first level signal according to the input voltage;
the power-off delay unit is connected with the voltage detection unit and used for outputting a second level signal according to the first level signal;
the power-on delay unit is connected with the voltage detection unit and used for outputting a third level signal according to the first level signal;
the short circuit control unit is connected with the power-off delay unit and the power-on delay unit, and is used for receiving the second level signal and the third level signal and outputting a short circuit control signal according to the second level signal and the third level signal;
the power supply control unit is connected with the power-on delay unit and the power supply control chip and used for receiving the third level signal and judging whether to start the power supply control chip according to the third level signal;
and the short circuit unit is connected with the short circuit control unit and used for receiving the short circuit control signal and judging whether the short circuit is arranged on the suppression resistor on the alternating current power supply live wire or not according to the short circuit control signal.
Further, when the first level signal is at a high level, the second level signal output by the power-off delay unit is a high level signal, and the third level signal output by the power-on delay unit in a delayed manner is a high level signal.
Further, when the first level signal is at a low level, the second level signal output by the power-off delay unit in a delayed manner is a low level signal, and the third level signal output by the power-on delay unit is a low level signal.
Further, the voltage detection unit includes:
the input voltage acquisition unit is connected with the alternating current power supply and is used for acquiring input voltage generated by the alternating current power supply;
the first comparator comprises a first in-phase end, a first inverting end and a first output end; the first in-phase end is connected with the input voltage acquisition unit, the first inverting end is connected with a preset first reference voltage, and the first output end is used for outputting the first level signal;
when the input voltage is greater than the first reference voltage, the first level signal is a high level signal; when the input voltage is less than the first reference voltage, the first level signal is a low level signal.
Further, the power-off delay unit includes:
a first diode, an anode of which is connected with the voltage detection unit;
one end of the first resistor is connected with the negative electrode of the first diode, and the other end of the first resistor is grounded;
one end of the first capacitor is connected with the negative electrode of the first diode, and the other end of the first capacitor is grounded;
and the second comparator comprises a second in-phase end, a second inverting end and a second output end, the second in-phase end is connected with the other end of the first resistor and the other end of the first capacitor, the second inverting end is connected with a preset second reference voltage, and the second output end is used for outputting the second level signal.
Further, the power-on delay unit includes:
a DC voltage source;
a second diode, a cathode of which is connected with the voltage detection unit;
one end of the second resistor is connected with the anode of the second diode, and the other end of the second resistor is connected with the direct-current voltage source;
one end of the second capacitor is connected with the negative electrode of the second diode, and the other end of the second capacitor is grounded;
and the third comparator comprises a third in-phase end, a third inverting end and a third output end, the third in-phase end is connected with the other end of the first resistor and the other end of the first capacitor, the third inverting end is connected with a preset third reference voltage, and the third output end is used for outputting the third level signal.
Further, the power supply control unit includes:
a DC voltage source;
a third resistor;
a cathode of the third diode is connected with the upper delay unit;
the anode of the first voltage-stabilizing tube is connected with the cathode of the third diode;
the first triode comprises a first base electrode, a first collector electrode and a first emission set, the first base electrode is connected with the direct-current voltage source through the third resistor and is connected with the negative electrode of the first voltage-stabilizing tube, and the first collector electrode is connected with the direct-current voltage source;
a fourth diode, an anode of which is connected to the first emitter, and a cathode of which is connected to the power control chip;
and one end of the third capacitor is connected with the cathode of the fourth diode and the power supply control chip, and the other end of the third capacitor is grounded.
Further, the short circuit control unit includes:
a fourth resistor;
a fifth resistor;
the anode of the fifth diode is connected with the upper delay unit;
the anode of the sixth diode is connected with the power-off delay unit, and the cathode of the sixth diode is connected with the cathode of the fifth diode;
a cathode of the second voltage-stabilizing tube is connected with a cathode of the sixth diode and a cathode of the fifth diode through the fourth resistor, and an anode of the second voltage-stabilizing tube is grounded through the fifth resistor;
and the second triode comprises a second base electrode, a second collector electrode and a second emission set, the second base electrode is connected with the anode of the second voltage-stabilizing tube, the second collector electrode is connected with the short-circuit unit, and the second emitter electrode is grounded.
Further, the short circuit unit includes:
a DC voltage source;
a sixth resistor;
a seventh diode, an anode of the seventh diode being connected with the short circuit control unit,
the relay, the first end of relay with alternating current power supply's live wire and restrain the ohmic connection, the second end of relay passes through sixth resistance with alternating current power supply's zero line is connected, the third end of relay with alternating current power supply's live wire and restrain the ohmic connection, the fourth end of relay with direct current voltage source connects, the fifth end of relay with short circuit control unit connects.
Further, the power-on delay unit further includes:
a seventh resistor;
a negative electrode of the eighth diode is connected with the direct-current voltage source, and a positive electrode of the eighth diode is grounded through the seventh resistor;
and the eighth resistor is connected between the cathode of the second diode and the second capacitor.
The embodiment of the utility model provides a through the first level signal of voltage detection unit according to the input voltage output that acquires, through outage delay unit and go up the delay unit and export second level signal and third level signal respectively according to first level signal to the realization carries out time sequence control to short circuit control unit and power control unit. Implement the embodiment of the utility model provides a, can realize the sequential control to the resistance that restraines, prevent that the circuit from damaging the resistance that restraines at the in-process that starts fast or turn-off, prolonged the life of the resistance that restraines, improved the reliability of circuit.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required 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 invention, and for those skilled in the art, other drawings can be obtained according to these drawings without any creative effort.
Fig. 1 is a schematic block diagram of a timing control circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a timing control circuit according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Please refer to fig. 1, which is a schematic block diagram of a timing control circuit according to an embodiment of the present invention. The circuit is connected between the ac power source and the power control chip, and includes, but is not limited to, a voltage detection unit 110, a power-off delay unit 120, a power-on delay unit 130, a short circuit control unit 150, a power control unit 140, and a short circuit unit 160.
The voltage detection unit 110 is connected to the ac power supply, and is configured to receive an input voltage of the ac power supply and output a first level signal according to the input voltage.
The power-off delay unit 120 is connected to the voltage detection unit 110, and is configured to output a second level signal according to the first level signal.
The power-up delay unit 130 is connected to the voltage detection unit 110, and is configured to output a third level signal according to the first level signal.
The short circuit control unit 150 is connected to the power-off delay unit 120 and the power-on delay unit 130, and configured to receive the second level signal and the third level signal, and output a short circuit control signal according to the second level signal and the third level signal.
The power control unit 140 is connected to the power-on delay unit 130 and the power control chip, and configured to receive the third level signal and determine whether to start the power control chip according to the third level signal.
The short circuit unit 160 is connected to the short circuit control unit 150, and configured to receive the short circuit control signal, and determine whether to short-circuit the suppression resistor disposed on the live wire of the ac power supply according to the short circuit control signal.
Further, when the first level signal is at a high level, the second level signal output by the power-off delay unit 120 is a high level signal, and the third level signal output by the power-on delay unit 130 in a delayed manner is a high level signal. When the first level signal is at a low level, the second level signal delayed and output by the power-off delay unit 120 is a low level signal, and the third level signal output by the power-on delay unit 130 is a low level signal.
In a specific implementation, when the second level signal is at a high level, the short circuit control unit 150 outputs a short circuit control signal to control the short circuit unit 160 to short circuit the suppression resistor. When the third level signal is at a high level, the power control unit 140 generates a power chip voltage signal to start the voltage control chip.
When the second level signal is at a low level, the short circuit control unit 150 does not output a short circuit control signal, and the short circuit unit 160 does not short-circuit the suppression resistor. When the third level signal is at a low level, the power control unit 140 does not generate a power chip voltage signal and does not start the voltage control chip.
The embodiment of the utility model provides a through the first level signal of voltage detection unit 110 according to the input voltage output that acquires, through outage delay unit 120 and go up electric delay unit 130 and export second level signal and third level signal respectively according to first level signal to the realization carries out time sequence control to short circuit control unit 150 and power control unit 140. Implement the embodiment of the utility model provides a, can realize the sequential control to the resistance that restraines, prevent that the circuit from damaging the resistance that restraines at the in-process that starts fast or turn-off, prolonged the life of the resistance that restraines, improved the reliability of circuit.
Fig. 2 is a circuit diagram of a timing control circuit according to an embodiment of the present invention.
Further, the voltage detection unit 110 includes, but is not limited to, an input voltage acquisition unit, a first comparator U1.
The input voltage acquisition unit is connected with the alternating current power supply and used for acquiring input voltage generated by the alternating current power supply.
In a specific implementation, the voltage acquisition unit includes a fourth capacitor C4, a ninth resistor R9, a tenth resistor R10, and an eleventh resistor R11. The input voltage acquisition unit is respectively connected with a live wire and a zero wire in the alternating current loop through a ninth diode D9 and a twelfth diode D10. The input voltage acquisition unit can acquire and filter the alternating voltage generated by the alternating current loop so as to transmit the alternating voltage to the first comparator U1.
The first comparator U1 comprises a first in-phase terminal, a first out-phase terminal and a first output terminal; the first non-inverting terminal is connected with the input voltage acquisition unit, the first inverting terminal is connected with a preset first reference voltage, and the first output terminal is used for outputting the first level signal. When the input voltage is greater than the first reference voltage, the first level signal is a high level signal; when the input voltage is less than the first reference voltage, the first level signal is a low level signal.
Specifically, the first reference voltage may be electrically connected to the first inverting terminal through a resistor, and the first reference voltage may be electrically connected to the ground through a capacitor. The first comparator U1 may also include a power input and a ground output. The power input end is electrically connected with a direct-current voltage source VCC through a resistor, and is connected with the ground through a capacitor; the grounding output end is electrically connected with the ground.
Specifically, the voltage detection unit 110 may further include a twelfth resistor R12, and the twelfth resistor R12 is connected between the first non-inverting terminal and the first output terminal. So that the first comparator U1 realizes hysteresis control, and the first comparator U1 is prevented from triggering repeatedly.
In a specific implementation, when the circuit is in a power-off state, the input voltage gradually decreases, and when the input voltage is smaller than the first reference voltage, the first level signal is a low level signal. When the circuit is in a power-on state, the input voltage gradually increases, and when the input voltage is greater than the first reference voltage, the first level signal is a high level signal.
Further, the power down delay unit 120 includes, but is not limited to, a first diode D1, a first resistor R1, a first capacitor C1, and a second comparator U2.
Wherein the anode of the first diode D1 is connected to the voltage detection unit 110.
One end of the first resistor R1 is connected to the cathode of the first diode D1, and the other end of the first resistor R1 is grounded.
One end of the first capacitor C1 is connected to the cathode of the first diode D1, and the other end of the first capacitor C1 is grounded.
The second comparator U2 includes a second in-phase terminal, a second inverting terminal and a second output terminal, the second in-phase terminal is connected to the other end of the first resistor R1 and the other end of the first capacitor C1, the second inverting terminal is connected to a preset second reference voltage, and the second output terminal is configured to output the second level signal.
Specifically, the first reference voltage may be electrically connected to the first inverting terminal through a resistor, and the first reference voltage may be electrically connected to the ground through a capacitor.
Specifically, the power down delay unit 120 may further include a sixteenth resistor R16, and the sixteenth resistor R16 is connected between the second in-phase terminal and the second output terminal. So that the second comparator U2 realizes hysteresis control, and the second comparator U2 is prevented from triggering repeatedly.
In a specific implementation, when the circuit is in the power-off state, the first level signal output by the voltage detection unit 110 is at a low level, and the first diode D1 is turned off. The first capacitor C1 discharges through the first resistor R1, so that the second level signal output by the second comparator U2 continues to be maintained as a high level signal. When the voltage generated by discharging the first capacitor C1 is less than the second reference voltage, the second level signal output by the second comparator U2 is a low level signal, and the effect of delaying the output of the second level signal can be achieved when the circuit is in a power-off state through the discharging action of the first capacitor C1. The discharge speed of the first capacitor C1 can be set by the size of the first capacitor C1 and the size of the first resistor R1.
Further, the upper delay unit 130 includes, but is not limited to, a dc voltage source VCC, a second diode D2, a second resistor R2, a second capacitor C2, and a third comparator U3. Wherein,
the cathode of the second diode D2 is connected to the voltage detection unit 110.
One end of the second resistor R2 is connected to the anode of the second diode D2, and the other end of the second resistor R2 is connected to the dc voltage source VCC.
One end of the second capacitor C2 is connected to the cathode of the second diode D2, and the other end of the second capacitor C2 is grounded.
The third comparator U3 includes a third in-phase terminal, a third inverting terminal and a third output terminal, the third in-phase terminal is connected to the other end of the first resistor R1 and the other end of the first capacitor C1, the third inverting terminal is connected to a preset third reference voltage, and the third output terminal is configured to output the third level signal.
Specifically, the third comparator U3 may further include a power input terminal and a ground output terminal. The power input end is electrically connected with a direct-current voltage source VCC through a resistor, and is connected with the ground through a capacitor; the grounding output end is electrically connected with the ground.
Specifically, the power-on delay unit 130 may further include a fifteenth resistor R15, where the fifteenth resistor R15 is connected between the third in-phase terminal and the third output terminal. So that the third comparator U3 realizes hysteresis control, and the third comparator U3 is prevented from triggering repeatedly.
In a specific implementation, the power-on delay unit 130 further includes a fourteenth resistor R14 and a thirteenth resistor R13. The dc voltage source VCC is connected to the second inverting terminal through a fourteenth resistor R14 and a thirteenth resistor R13 to generate the third reference voltage.
In a specific implementation, when the circuit is in a power-on state, the first level signal output by the voltage detection unit 110 is at a high level. On the one hand, the first diode D1 is turned on, the second level signal output by the second comparator U2 is a high level signal, and the short circuit control unit 150 outputs a short circuit control signal to control the short circuit unit 160 to short-circuit the suppression resistor RT 1. On the other hand, the second diode D2 is turned off, and the dc voltage source VCC charges the second capacitor C2 through the second resistor R2. If the voltage of the second capacitor C2 is higher than the third reference voltage, the third level signal output by the third comparator U3 is a high level signal, and the effect of delaying the output of the third level signal can be achieved when the circuit is in the power-on state through the charging action of the second capacitor C2. The charging speed of the first capacitor C1 can be set by the size of the second capacitor C2 and the size of the second resistor R2.
Further, the power-on delay unit 130 further includes a seventh resistor R7, an eighth diode D8, and an eighth resistor R8. The negative electrode of the eighth diode D8 is connected to the dc voltage source VCC, and the positive electrode of the eighth diode D8 is grounded through the seventh resistor R7. The eighth diode D8 can quickly release the voltage of the second capacitor C2. The eighth resistor R8 is connected between the cathode of the second diode D2 and the second capacitor C2.
Further, the power control unit 140 includes, but is not limited to, a dc voltage source VCC, a third resistor R3, a third diode D3, a first voltage regulator ZD1, a first transistor Q1, a fourth diode D4, and a third capacitor C3. Wherein,
the cathode of the third diode D3 is connected to the power-on delay unit 130.
The anode of the first voltage regulator ZD1 is connected to the cathode of the third diode D3.
The first triode comprises a first base electrode, a first collector electrode and a first emission set, the first base electrode is connected with the direct current voltage source VCC through the third resistor R3, the first base electrode is connected with the negative electrode of the first voltage-stabilizing tube ZD1, and the first collector electrode is connected with the direct current voltage source VCC.
The anode of the fourth diode D4 is connected to the first emitter, and the cathode of the fourth diode D4 is connected to the power control chip.
One end of the third capacitor C3 is connected to the cathode of the fourth diode D4 and the power control chip, and the other end of the third capacitor C3 is grounded.
In specific implementation, when the third level signal is a high level signal, the third diode D3 is turned off, the first voltage regulator ZD1 is turned off, and the base voltage of the first triode Q1 is equal to the voltage of the dc voltage source VCC, so that the first triode Q1 is turned on, and the dc voltage source VCC charges the third capacitor C3. When the voltage of the third capacitor C3 is higher than a preset starting voltage, the power control chip starts.
Particularly, the discharging speed of the third capacitor C3 is less than the discharging speed of the first capacitor C1, so that when the working voltage IC _ VCC of the power control chip is lower than the preset starting voltage after being discharged through the third capacitor C3, that is, after the power control chip does not work, the short circuit control unit 150 stops outputting the short circuit control signal, stops short-circuiting the inhibiting resistor RT1, and effectively ensures the circuit timing. For example, when the circuit is in a power-off state, if the power control chip operating voltage IC _ VCC is greater than the preset starting voltage, the short-circuit unit 160 will keep short-circuiting the inhibiting resistor RT1, so as to prevent the short-circuit unit from being opened before the next starting, which results in the inhibiting resistor RT1 being connected in series into the loop.
Further, the short circuit control unit 150 includes, but is not limited to, a fourth resistor R4, a fifth resistor R5, a fifth diode D5, a sixth diode D6, a second voltage regulator ZD2, and a second transistor Q2. Wherein,
the anode of the fifth diode D5 is connected to the power-on delay unit 130;
the anode of the sixth diode D6 is connected to the power-off delay unit 120, and the cathode of the sixth diode D6 is connected to the cathode of the fifth diode D5;
the cathode of the second voltage-regulator tube ZD2 is connected with the cathode of the sixth diode D6 and the cathode of the fifth diode D5 through the fourth resistor R4, and the anode of the second voltage-regulator tube ZD2 is grounded through the fifth resistor R5;
the second triode comprises a second base electrode, a second collector electrode and a second emitter electrode, the second base electrode is connected with the positive electrode of the second voltage regulator tube ZD2, the second collector electrode is connected with the short-circuit unit 160, and the second emitter electrode is grounded.
In a specific implementation, when the second level signal is at a high level, the sixth diode D6 is turned on, the second emitter and the second collector of the second transistor Q2 are turned on, and the short circuit control unit 150 outputs a short circuit control signal to control the short circuit unit 160 to short circuit the resistor RT 1.
Further, the short circuit unit 160 includes, but is not limited to, a dc voltage source VCC, a sixth resistor R6, a seventh diode D7, and a relay K1. Wherein,
the anode of the seventh diode D7 is connected to the short-circuit control unit 150,
relay K1's first end with alternating current power supply's live wire and restrain resistance RT1 and connect, relay K1's second end passes through sixth resistance R6 with alternating current power supply's zero line is connected, relay K1's third end with alternating current power supply's live wire and restrain resistance RT1 and connect, relay K1's fourth end with direct current voltage source VCC connects, relay K1's fifth end with short circuit control unit 150 connects.
In a specific implementation, when the short circuit control circuit outputs a short circuit control signal, the first end of the relay K1 is connected with the third end of the relay K1, so that the inhibiting resistor RT1 is short-circuited to prevent the inhibiting resistor RT1 from being burnt. In other embodiments, the relay is replaced by other switching elements, such as a field effect transistor.
Referring to fig. 2, the operation principle of the timing control circuit according to the present embodiment is described in detail below.
When the circuit is in a power-off state, the input voltage gradually decreases, and if the input voltage is less than the first reference voltage, the first level signal output by the first comparator U1 is a low level signal. At this time, the first diode D1 is turned off, the first capacitor C1 discharges through the first resistor R1, so that the second level signal output by the second comparator U2 continues to be maintained as a high level signal, and the short circuit control unit 150 continues to control the short circuit unit 160 to short circuit the suppressing resistor RT 1. When the voltage generated by discharging the first capacitor C1 is less than the second reference voltage, the second level signal output by the second comparator U2 is a low level signal, and the effect of delaying the output of the second level signal can be achieved when the circuit is in a power-off state through the discharging action of the first capacitor C1. On the other hand, the second diode D2 is turned on, the third level signal output by the third comparator U3 is a low level signal, which causes the third diode D3 to be turned off, and the power control unit 140 does not activate the power control chip. The low-level second level signal is output in a delayed mode, so that the power supply control chip stops short-circuiting the suppression resistor RT1 after not working, and the circuit control time sequence is effectively guaranteed.
When the circuit is in a power-on state, the input voltage gradually increases, and if the input voltage is greater than the first reference voltage, the first level signal output by the first comparator U1 is a high level signal. At this time, the first diode D1 is turned on, so that the second level signal output by the second comparator U2 is a high level signal, and the short circuit control unit 150 controls the short circuit unit 160 to short circuit the suppression resistor RT 1. On the other hand, the second diode D2 is turned off, and the dc voltage source VCC charges the second capacitor C2 through the second resistor R2. If the voltage of the second capacitor C2 is higher than the third reference voltage, the third level signal output by the third comparator U3 is a high level signal. The third diode D3 is turned off, the first voltage regulator ZD1 is turned off, and the base voltage of the first triode Q1 is equal to the voltage of the dc voltage source VCC, so that the first triode Q1 is turned on, and the dc voltage source VCC charges the third capacitor C3. When the voltage of the third capacitor C3 is higher than a preset starting voltage, the power control chip starts. By delaying and outputting the high-level third level signal, the power control chip can be started only after the suppression resistor RT1 is short-circuited, and the circuit control time sequence is effectively ensured.
When the circuit is in a frequent power-on or power-off state, the inhibiting resistor RT1 can continuously keep a short-circuit state by delaying to output a low-level second level signal until the voltage generated by the discharge of the first capacitor C1 is less than the second reference voltage. In the process of frequent power-on or power-off, the suppression resistor RT1 does not need to be frequently short-circuited or broken-circuited due to the time delay effect, the service life of the suppression resistor RT1 is prolonged, and the reliability of the circuit is improved.
It should be noted that, for simplicity of description, the above-mentioned embodiments of the method are described as a series of acts or combinations, but those skilled in the art should understand that the present invention is not limited by the described order of acts, as some steps may be performed in other orders or simultaneously according to the present application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required in this application.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments. It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A kind of sequential control circuit, connect between AC power and power control chip, characterized by that, the said circuit includes:
the voltage detection unit is connected with the alternating current power supply and used for receiving the input voltage of the alternating current power supply and outputting a first level signal according to the input voltage;
the power-off delay unit is connected with the voltage detection unit and used for outputting a second level signal according to the first level signal;
the power-on delay unit is connected with the voltage detection unit and used for outputting a third level signal according to the first level signal;
the short circuit control unit is connected with the power-off delay unit and the power-on delay unit, and is used for receiving the second level signal and the third level signal and outputting a short circuit control signal according to the second level signal and the third level signal;
the power supply control unit is connected with the power-on delay unit and the power supply control chip and used for receiving the third level signal and judging whether to start the power supply control chip according to the third level signal;
and the short circuit unit is connected with the short circuit control unit and used for receiving the short circuit control signal and judging whether the short circuit is arranged on the suppression resistor on the alternating current power supply live wire or not according to the short circuit control signal.
2. The circuit of claim 1, wherein when the first level signal is a high level, the second level signal output by the power-off delay unit is a high level signal, and the third level signal output by the power-on delay unit is a high level signal.
3. The circuit of claim 1, wherein when the first level signal is a low level, the second level signal output by the power-down delay unit in a delayed manner is a low level signal, and the third level signal output by the power-up delay unit is a low level signal.
4. The circuit of claim 1, wherein the voltage detection unit comprises:
the input voltage acquisition unit is connected with the alternating current power supply and is used for acquiring input voltage generated by the alternating current power supply;
the first comparator comprises a first in-phase end, a first inverting end and a first output end; the first in-phase end is connected with the input voltage acquisition unit, the first inverting end is connected with a preset first reference voltage, and the first output end is used for outputting the first level signal;
when the input voltage is greater than the first reference voltage, the first level signal is a high level signal; when the input voltage is less than the first reference voltage, the first level signal is a low level signal.
5. The circuit of claim 1, wherein the power down delay unit comprises:
a first diode, an anode of which is connected with the voltage detection unit;
one end of the first resistor is connected with the negative electrode of the first diode, and the other end of the first resistor is grounded;
one end of the first capacitor is connected with the negative electrode of the first diode, and the other end of the first capacitor is grounded;
and the second comparator comprises a second in-phase end, a second inverting end and a second output end, the second in-phase end is connected with the other end of the first resistor and the other end of the first capacitor, the second inverting end is connected with a preset second reference voltage, and the second output end is used for outputting the second level signal.
6. The circuit of claim 1, wherein the power-up delay unit comprises:
a DC voltage source;
a second diode, a cathode of which is connected with the voltage detection unit;
one end of the second resistor is connected with the anode of the second diode, and the other end of the second resistor is connected with the direct-current voltage source;
one end of the second capacitor is connected with the negative electrode of the second diode, and the other end of the second capacitor is grounded;
and the third comparator comprises a third in-phase end, a third inverting end and a third output end, the third in-phase end is connected with the other end of the first resistor and the other end of the first capacitor, the third inverting end is connected with a preset third reference voltage, and the third output end is used for outputting the third level signal.
7. The circuit of claim 1, wherein the power supply control unit comprises:
a DC voltage source;
a third resistor;
a cathode of the third diode is connected with the upper delay unit;
the anode of the first voltage-stabilizing tube is connected with the cathode of the third diode;
the first triode comprises a first base electrode, a first collector electrode and a first emission set, the first base electrode is connected with the direct-current voltage source through the third resistor and is connected with the negative electrode of the first voltage-stabilizing tube, and the first collector electrode is connected with the direct-current voltage source;
a fourth diode, an anode of which is connected to the first emitter, and a cathode of which is connected to the power control chip;
and one end of the third capacitor is connected with the cathode of the fourth diode and the power supply control chip, and the other end of the third capacitor is grounded.
8. The circuit of claim 1, wherein the short circuit control unit comprises:
a fourth resistor;
a fifth resistor;
the anode of the fifth diode is connected with the upper delay unit;
the anode of the sixth diode is connected with the power-off delay unit, and the cathode of the sixth diode is connected with the cathode of the fifth diode;
a cathode of the second voltage-stabilizing tube is connected with a cathode of the sixth diode and a cathode of the fifth diode through the fourth resistor, and an anode of the second voltage-stabilizing tube is grounded through the fifth resistor;
and the second triode comprises a second base electrode, a second collector electrode and a second emission set, the second base electrode is connected with the anode of the second voltage-stabilizing tube, the second collector electrode is connected with the short-circuit unit, and the second emitter electrode is grounded.
9. The circuit of claim 1, wherein the shorting unit comprises:
a DC voltage source;
a sixth resistor;
a seventh diode, an anode of the seventh diode being connected with the short circuit control unit,
the relay, the first end of relay with alternating current power supply's live wire and restrain the ohmic connection, the second end of relay passes through sixth resistance with alternating current power supply's zero line is connected, the third end of relay with alternating current power supply's live wire and restrain the ohmic connection, the fourth end of relay with direct current voltage source connects, the fifth end of relay with short circuit control unit connects.
10. The circuit of claim 6, wherein the power-up delay unit further comprises:
a seventh resistor;
a negative electrode of the eighth diode is connected with the direct-current voltage source, and a positive electrode of the eighth diode is grounded through the seventh resistor;
and the eighth resistor is connected between the cathode of the second diode and the second capacitor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720497708.1U CN206805342U (en) | 2017-05-05 | 2017-05-05 | A kind of sequential control circuit |
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| CN201720497708.1U CN206805342U (en) | 2017-05-05 | 2017-05-05 | A kind of sequential control circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109164746A (en) * | 2018-11-14 | 2019-01-08 | 上海英恒电子有限公司 | A kind of lower electric sequential control circuit and power circuit |
| CN109375535A (en) * | 2018-09-26 | 2019-02-22 | 科大讯飞股份有限公司 | A kind of enabled circuit unit, sequential control system and method |
| CN110471320A (en) * | 2019-09-23 | 2019-11-19 | 重庆工商大学 | Robot emergency stop control circuit |
| CN110768650A (en) * | 2018-07-27 | 2020-02-07 | 台达电子工业股份有限公司 | Abnormal voltage protection device and operation method thereof |
| CN113867223A (en) * | 2021-10-15 | 2021-12-31 | 武汉长江计算科技有限公司 | Power-on and power-off control system and method |
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2017
- 2017-05-05 CN CN201720497708.1U patent/CN206805342U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110768650A (en) * | 2018-07-27 | 2020-02-07 | 台达电子工业股份有限公司 | Abnormal voltage protection device and operation method thereof |
| CN109375535A (en) * | 2018-09-26 | 2019-02-22 | 科大讯飞股份有限公司 | A kind of enabled circuit unit, sequential control system and method |
| CN109164746A (en) * | 2018-11-14 | 2019-01-08 | 上海英恒电子有限公司 | A kind of lower electric sequential control circuit and power circuit |
| CN110471320A (en) * | 2019-09-23 | 2019-11-19 | 重庆工商大学 | Robot emergency stop control circuit |
| CN113867223A (en) * | 2021-10-15 | 2021-12-31 | 武汉长江计算科技有限公司 | Power-on and power-off control system and method |
| CN113867223B (en) * | 2021-10-15 | 2022-10-04 | 武汉长江计算科技有限公司 | Power-on and power-off control system and method |
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