CN112713579A - Control method and system of anti-surge circuit and air conditioning equipment - Google Patents
Control method and system of anti-surge circuit and air conditioning equipment Download PDFInfo
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- CN112713579A CN112713579A CN202011448685.8A CN202011448685A CN112713579A CN 112713579 A CN112713579 A CN 112713579A CN 202011448685 A CN202011448685 A CN 202011448685A CN 112713579 A CN112713579 A CN 112713579A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/026—Current limitation using PTC resistors, i.e. resistors with a large positive temperature coefficient
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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Abstract
The invention relates to the technical field of anti-surge circuit control, and particularly provides a control method and a control system of an anti-surge circuit and air conditioning equipment, aiming at solving the technical problem that the frequency conversion module cannot be normally powered on due to heating caused by the fact that the current of an air conditioner compressor or the current of a fan is left flowing through a PTC resistor. To this end, the method of the invention comprises the following steps: when the direct current bus voltage of the frequency converter is under-voltage and/or the open-phase detection circuit detects the open-phase fault, after the working operation of the compressor or the fan is stopped and the output of PWM pulse width modulation is turned off, the power relay is turned off after a period of time is delayed, so that the residual current of the compressor or the fan passes through the relay. Under the condition of adopting the method, the invention can better realize the anti-surge function, and can avoid the heating caused by the residual current of the air conditioner compressor or the residual current of the fan flowing through the PTC resistor, so that the air conditioner can not be normally powered on, and the safe, reliable and normal operation of an air conditioner circuit is ensured.
Description
Technical Field
The invention relates to the technical field of circuit control, in particular to a control method and a control system of an anti-surge circuit and air conditioning equipment.
Background
In each big air conditioner factory, the anti-surge scheme is a very mature technology, each family also has a good effect on the suppression of surge current, when the air conditioner frequency conversion module has the anti-surge function, most anti-surge loops adopt the relay and the thermistor PTC/cement resistor, when electrifying, the PTC/cement resistor is firstly connected into the main loop, the phenomenon that the charging current is too large and the impact rectifier diode is damaged is prevented, after the electrolytic capacitor of the main loop is charged, the relay is attracted and the PTC/cement resistor is in short circuit, and thus the anti-surge function is realized. But for other problems caused by surge protection circuits, consideration needs to be given to details. The surge prevention function is also applied to the condition that the power grid is in phase failure or the voltage of the power grid is too low, namely the power relay is disconnected when the power grid is in phase failure or the voltage of the power grid is too low, and the PTC is reconnected to prevent larger impact current; because the power relay is disconnected, the PTC is connected to the main loop, and because the current of the air conditioner compressor or the current of the fan possibly remains at the moment, the current flows through the PTC, the PTC is heated; if the temperature of the PTC is increased repeatedly for several times under the condition of high room temperature environment, the normal charging cannot be realized, and the frequency conversion module cannot be normally powered on to operate.
Therefore, a control scheme with an anti-surge function is required to be provided, so that the anti-surge function can be well realized, the problem that the frequency conversion module cannot be normally powered on due to heating caused by the fact that the current of the air conditioner compressor or the current of the fan flows through the PTC resistor is solved, and the safe, reliable and normal operation of the air conditioner circuit is guaranteed.
Disclosure of Invention
In order to overcome the defects, the invention is provided to solve or at least partially solve the technical problem that the frequency conversion module cannot be normally powered on due to heating caused by the fact that the current of the air conditioner compressor or the current of the fan is remained to flow through the PTC resistor while the anti-surge function is well realized. The invention provides a control method and a control system of an anti-surge circuit and air conditioning equipment for solving the technical problems.
In a first aspect, a method for controlling an anti-surge circuit is provided, including:
when the direct current bus voltage of the frequency converter is under-voltage and/or the open-phase detection circuit detects the open-phase fault,
after the work operation of the compressor or the fan is stopped and the output of the PWM is turned off, the power relay is turned off after a period of time is delayed, so that the residual current of the compressor or the fan passes through the relay.
The under-voltage means that the bus voltage of the direct-current bus after rectification and filtration in the frequency converter is lower than the rated voltage;
the phase-lack fault means that one phase of a three-phase input power supply of the frequency conversion module is lacked;
if the voltage of the direct current bus of the frequency converter is lower than a preset threshold voltage, indicating that undervoltage occurs;
if the open-phase detection circuit detects that the open-phase fault exists when the three-phase power supply is input and outputs an open-phase fault alarm signal, the open-phase fault is detected;
the threshold voltage is-30% of the rated voltage value, and the rated voltage is the optimal voltage of the frequency converter during long-time normal operation.
Wherein, "turn off power relay after a period of time" specifically includes:
and timing by a built-in timer, and after delaying for 10ms, controlling the power relay to be switched off by an amplifying circuit.
Wherein the amplifying circuit comprises: two triodes and one or more resistors;
short circuit refers to a local short circuit connection mode which does not cause damage to electronic components in a circuit and causes the electronic components to temporarily fail to work;
the PTC resistor is a thermistor having a positive temperature coefficient in which the resistance value increases as the temperature increases;
the power relay is disconnected again to a time delay to make compressor or fan residual current pass through the relay, specifically still include:
during the delay of 10ms, the two triodes control the switch of the power relay to be in a closed state, the PTC resistor of the anti-surge circuit is short-circuited, and the residual current of the compressor or the fan flows through the switch of the power relay;
after the delay is 10ms, the two triodes control the switch of the power relay to be in an off state;
when the power is powered on again, the PTC resistor is connected into the main loop;
and after the electrolytic capacitor in the main loop is charged, closing the switch of the power relay in an attracting mode, and then short-circuiting the PTC resistor again.
In a second aspect, a control system of an anti-surge circuit is provided, where the anti-surge circuit specifically includes:
one end of the PTC resistor is connected into the main loop, and the PTC resistor is connected with a switch of the power relay in parallel;
one end of the power relay is connected with the amplifying circuit, and the power relay is connected with a rectifying diode D1 in parallel;
when the direct current bus voltage of the frequency converter is under-voltage and/or the open-phase detection circuit detects the open-phase fault, after the working operation of the compressor or the fan is stopped and the output of PWM pulse width modulation is turned off, the amplifying circuit controls the power relay to be turned off after a period of time delay, so that the residual current of the compressor or the fan passes through the relay.
The under-voltage means that the bus voltage of the direct-current bus after rectification and filtration in the frequency converter is lower than the rated voltage;
the phase-lack fault means that one phase of a three-phase input power supply of the frequency conversion module is lacked;
if the voltage of the direct current bus of the frequency converter is lower than a preset threshold voltage, indicating that undervoltage occurs;
if the open-phase detection circuit detects that the open-phase fault exists when the three-phase power supply is input and outputs an open-phase fault alarm signal, the open-phase fault is detected;
the threshold voltage is-30% of the rated voltage value, and the rated voltage is the optimal voltage of the frequency converter during long-time normal operation.
The step of controlling the power relay to be turned off after a period of time delay through the amplifying circuit specifically includes:
timing by a built-in timer, delaying for 10ms, and then controlling the power relay to be switched off by an amplifying circuit;
during the delay of 10ms, two triodes of the amplifying circuit control the switch of the power relay to be in a closed state, the PTC resistor is short-circuited, and the residual current of the compressor or the fan flows through the switch of the power relay;
when the power is powered on again, the PTC resistor is connected into the main loop;
and after the electrolytic capacitor in the main loop is charged, closing the switch of the power relay in an attracting mode, and then short-circuiting the PTC resistor again.
In the amplifying circuit, the two triodes and one or more resistors form a switching circuit;
the drain electrode of a first triode Q1 and the drain electrode of a second triode Q2 in the two triodes are connected with one end of the power relay; resistors are respectively connected between the grid electrodes and the source electrodes of the first triode Q1 and the second triode Q2, the source electrode of the second triode Q2 is grounded, and the grid electrode of the first triode Q1 is connected with other resistors;
after the delay of 10ms, the switch circuit enters a cut-off state to open the switch of the power relay.
In a third aspect, a computer-readable storage medium is provided, in which a plurality of program codes are stored, the program codes being suitable for being loaded and executed by a processor to execute the control method of the anti-surge circuit described in any one of the preceding claims;
alternatively, a control device comprising a processor and a memory, the memory device being adapted to store a plurality of program codes, the program codes being adapted to be loaded and run by the processor to perform the control method of the anti-surge circuit of any of the preceding claims.
In a fourth aspect, there is provided an air conditioning apparatus comprising the control system of the surge protection circuit of claims 5-8;
alternatively, the first and second electrodes may be,
the air conditioning apparatus includes: an air conditioner inverter and a control device as described in the foregoing.
One or more technical schemes of the invention at least have one or more of the following beneficial effects:
the invention relates to the technical field of surge-proof circuit control, and particularly provides a control method and a control system of a surge-proof circuit and air conditioning equipment. Under the condition of adopting the method, the invention can better realize the anti-surge function, and can avoid the heating caused by the residual current of the air conditioner compressor or the residual current of the fan flowing through the PTC resistor, so that the air conditioner can not be normally powered on, and the safe, reliable and normal operation of an air conditioner circuit is ensured.
Drawings
Fig. 1 is a main flow chart of one embodiment of a control method of an anti-surge circuit according to the present invention;
fig. 2 is a block diagram of an embodiment of a control system of an anti-surge circuit according to the present invention;
figure 3 is a schematic diagram of one embodiment of a control circuit of an anti-surge circuit according to aspects of the present invention.
Detailed Description
For the purpose of facilitating understanding of the present invention, the present invention will be described more fully and in detail below with reference to the accompanying drawings and examples, but it will be understood by those skilled in the art that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of the present invention.
In the description of the present invention, a "module" or "processor" may include hardware, software, or a combination of both. A module may comprise hardware circuitry, various suitable sensors, communication ports, memory, may comprise software components such as program code, or may be a combination of software and hardware. The processor may be a central processing unit, microprocessor, image processor, digital signal processor, or any other suitable processor. The processor has data and/or signal processing functionality. The processor may be implemented in software, hardware, or a combination thereof. Non-transitory computer readable storage media include any suitable medium that can store program code, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random-access memory, and the like. The term "a and/or B" denotes all possible combinations of a and B, such as a alone, B alone or a and B. The term "at least one A or B" or "at least one of A and B" means similar to "A and/or B" and may include only A, only B, or both A and B. The singular forms "a", "an" and "the" may include the plural forms as well.
Direct current bus voltage: the direct current bus is used for bearing and rectifying in the frequency converter and then converting alternating current into direct current, and the direct current is converted into alternating current in the inverter; the dc bus voltage is the rectified and filtered bus voltage.
PWM pulse width modulation: the pulse width modulation is an analog control mode, and the bias of a transistor base electrode or an MOS tube grid electrode is modulated according to the change of corresponding load to change the conduction time of the transistor or the MOS tube, so that the change of the output of the switching voltage-stabilized power supply is realized.
Phase failure: one phase of the three-phase input power supply of the frequency conversion module is lost.
The following describes an implementation of the present invention with reference to a main flowchart of an embodiment of a control method of an anti-surge circuit of the present invention shown in fig. 1.
Step S110, determining that the direct current bus voltage of the frequency converter is under-voltage and/or the open-phase detection circuit detects the open-phase fault;
in one embodiment, if the dc bus voltage of the inverter is lower than a preset threshold voltage, an undervoltage is indicated; or, if the open-phase detection circuit detects that the open-phase fault exists when the three-phase power supply is input and outputs an open-phase fault alarm signal, the open-phase fault is detected; the threshold voltage is-30% of the rated voltage value, and the rated voltage is the optimal voltage of the frequency converter during long-time normal operation.
Further, when the direct current bus voltage detection circuit detects undervoltage or the open-phase detection circuit detects an open-phase signal, that is, undervoltage or open-phase fault is found, the power grid is fluctuated or instantly stopped.
In one example, when the power grid voltage fluctuates and/or the power is instantaneously powered down, if the direct current bus voltage detection circuit detects that the direct current bus voltage is lower than a preset threshold voltage, the voltage is under-voltage; the threshold voltage is-30% of a rated voltage value, and the rated voltage is the optimal voltage of the frequency converter during long-time normal operation; if the rated voltage value of the frequency converter is 220 volts, when the detected voltage value of the direct current bus is 150 volts and is lower than-30% of the threshold voltage value, the undervoltage is judged to occur.
And step S120, according to the determined undervoltage or open-phase fault, after the work operation of the compressor or the fan is stopped and the output of PWM pulse width modulation is turned off, delaying a period of time and then turning off the power relay so as to enable the residual current of the compressor or the fan to pass through the relay.
In one embodiment, once a power grid fluctuation or an instantaneous shutdown occurs, an under-voltage or open-phase fault is detected, the micro control unit MCU may control the operation structures such as a compressor or a fan to shutdown and to turn off pulse width modulation, and further, the PTC of the anti-surge circuit needs to be turned off before being connected to the main circuit. The disconnection mode can be that a built-in timer is used for timing, and after the time delay of 10ms, the power relay is controlled to be disconnected through an amplifying circuit.
The amplification circuit includes: two triodes and one or more resistors;
the short circuit refers to a local short circuit power connection mode which does not cause damage to electronic components in a circuit and enables the electronic components to temporarily fail to work;
the PTC resistor is a thermistor having a positive temperature coefficient in which the resistance value increases as the temperature increases;
the power relay is disconnected again to a time delay to make compressor or fan residual current pass through the relay, specifically still include:
during the delay of 10ms, the two triodes control the switch of the power relay to be in a closed state, the PTC resistor of the anti-surge circuit is short-circuited, and the residual current of the compressor or the fan flows through the switch of the power relay;
after the delay is 10ms, the two triodes control the switch of the power relay to be in an off state;
when the power is powered on again, the PTC resistor is connected into the main loop;
and after the electrolytic capacitor in the main loop is charged, closing the switch of the power relay in an attracting mode, and then short-circuiting the PTC resistor again.
Specifically, after the micro control unit MCU stops the working operation of the compressor or the fan and turns off the output of PWM (pulse width modulation), during the delay of 10ms, the micro control unit MCU outputs a high level, two triodes are opened, and drive current is output to the power relay through the two triodes to control the switch of the power relay to be in a closed state, so that the PTC resistor of the anti-surge circuit is short-circuited, and the residual current of the compressor or the fan flows through the switch of the power relay; after delaying for 10ms, the micro control unit MCU outputs a low level, the two triodes are cut off, and the switch of the power relay is controlled to be in a disconnected state; when the power is powered on again, the PTC resistor is connected into the main loop; and after the electrolytic capacitor in the main loop is charged, closing the switch of the power relay in an attracting mode, and then short-circuiting the PTC resistor again. Wherein electrolytic capacitors in the main circuit are used for filtering and smoothing the voltage waveform.
The following describes an implementation of the present invention with reference to fig. 2, which is a block diagram of a control system of an anti-surge circuit according to an embodiment of the present invention. The system at least comprises:
the surge protection circuit specifically includes: one end of the PTC resistor 210 is connected to the main loop, and the other end of the PTC resistor is connected to the power supply voltage VCC, and the PTC resistor is connected in parallel with the switch of the power relay; the power relay 220 has one end connected to the amplifying circuit 230 and the other end connected to the dc power supply, and is connected in parallel to the rectifying diode D1;
in one example, fig. 3 is a schematic diagram of one embodiment of a control circuit for an anti-surge circuit in accordance with aspects of the present invention; one end of the PTC1 resistor is connected into the main loop, the other end of the PTC1 resistor is connected with the power supply voltage VCC, and the PTC1 resistor is connected with the switch of the power relay RY4 in parallel; the power relay RY4 has one end connected to an amplifier circuit and the other end connected to a 12V dc power supply, and the power relay RY4 is connected in parallel to a rectifier diode D1.
In one embodiment, when the direct-current bus voltage of the frequency converter is under-voltage due to power grid fluctuation or instantaneous stop and/or the open-phase detection circuit detects an open-phase fault, the working operation of the compressor or the fan is stopped, the output of PWM pulse width modulation is turned off, and then the power relay is controlled to be turned off after a period of time delay through the amplifying circuit, so that the residual current of the compressor or the fan passes through the relay.
In one embodiment, if the dc bus voltage of the inverter is lower than a preset threshold voltage, an undervoltage is indicated; if the open-phase detection circuit detects that the open-phase fault exists when the three-phase power supply is input and outputs an open-phase fault alarm signal, the open-phase fault is detected; the threshold voltage is-30% of the rated voltage value, and the rated voltage is the optimal voltage of the frequency converter during long-time normal operation.
In one example, when the power grid voltage fluctuates and/or the power is instantaneously powered down, if the direct current bus voltage detection circuit detects that the direct current bus voltage is lower than a preset threshold voltage, the voltage is under-voltage; the threshold voltage is-30% of a rated voltage value, and the rated voltage is the optimal voltage of the frequency converter during long-time normal operation; if the rated voltage value of the frequency converter is 220 volts, when the detected voltage value of the direct current bus is 150 volts and is lower than-30% of the threshold voltage value, the undervoltage is judged to occur.
In one embodiment, in the amplifying circuit, the two transistors and one or more resistors form a switching circuit; the drain electrode of a first triode Q1 and the drain electrode of a second triode Q2 in the two triodes are connected with one end of the power relay; resistors are respectively connected between the grid electrodes and the source electrodes of the first triode Q1 and the second triode Q2, the source electrode of the second triode Q2 is grounded, and the grid electrode of the first triode Q1 is connected with other resistors; after the delay of 10ms, the switch circuit enters a cut-off state to open the switch of the power relay.
In one embodiment, the power relay is controlled to be switched off by an amplifying circuit after the time is delayed for 10ms by a built-in timer.
The amplification circuit includes: two triodes and one or more resistors;
the short circuit refers to a local short circuit power connection mode which does not cause damage to electronic components in a circuit and enables the electronic components to temporarily fail to work;
the PTC resistor is a thermistor having a positive temperature coefficient in which the resistance value increases as the temperature increases;
the power relay is disconnected again to a time delay to make compressor or fan residual current pass through the relay, specifically still include:
during the delay of 10ms, the two triodes control the switch of the power relay to be in a closed state, the PTC resistor of the anti-surge circuit is short-circuited, and the residual current of the compressor or the fan flows through the switch of the power relay;
after the delay is 10ms, the two triodes control the switch of the power relay to be in an off state;
when the power is powered on again, the PTC resistor is connected into the main loop;
and after the electrolytic capacitor in the main loop is charged, closing the switch of the power relay in an attracting mode, and then short-circuiting the PTC resistor again.
Specifically, after the micro control unit MCU stops the working operation of the compressor or the fan and turns off the output of PWM (pulse width modulation), in the period of delaying for 10ms, the micro control unit MCU outputs a high level, two triodes are opened, the two triodes output driving currents to the power relay, the switch of the power relay is controlled to be in a closed state, the PTC resistor of the anti-surge circuit is in short circuit, and the residual current of the compressor or the fan flows through the switch of the power relay; after delaying for 10ms, the micro control unit MCU outputs a low level, the two triodes are cut off, and the switch of the power relay is controlled to be in a disconnected state; when the power is powered on again, the PTC resistor is connected into the main loop; and after the electrolytic capacitor in the main loop is charged, closing the switch of the power relay in an attracting mode, and then short-circuiting the PTC resistor again. Wherein electrolytic capacitors in the main circuit are used for filtering and smoothing the voltage waveform.
Further, in an embodiment of a computer-readable storage medium of the present invention, the storage medium has stored therein a plurality of program codes, the program codes being adapted to be loaded and executed by a processor to execute the control method of the anti-surge circuit according to any one of the preceding claims; alternatively, a control device comprising a processor and a memory, the memory device being adapted to store a plurality of program codes, the program codes being adapted to be loaded and run by the processor to perform the control method of the anti-surge circuit of any of the preceding claims.
Further, in an embodiment of an air conditioning apparatus of the present invention, the air conditioning apparatus includes the control system of the aforementioned anti-surge circuit; alternatively, the air conditioning apparatus includes: an air conditioner inverter and a control device as described in the foregoing.
An example of an application scenario of the technical solution of the present invention is described below to further illustrate the implementation of the present invention:
as shown in fig. 3, the surge protection circuit of an air conditioner includes: one end of the PTC1 resistor is connected into the main loop, the other end of the PTC1 resistor is connected with the power supply voltage VCC, and the PTC1 resistor is connected with the switch of the power relay RY4 in parallel; the power relay RY4 has one end connected to an amplifier circuit and the other end connected to a 12V dc power supply, and the power relay RY4 is connected in parallel to a rectifier diode D1. The amplifying circuit, such as a Darlington circuit, comprises two triodes and one or more resistors to form a switch circuit; the drain electrode of a first triode Q1 and the drain electrode of a second triode Q2 in the two triodes are connected with one end of the power relay; resistors are respectively connected between the gates and the sources of the first triode Q1 and the second triode Q2, the source of the second triode Q2 is grounded, and the gate of the first triode Q1 is connected with other resistors.
If the rated voltage value of a certain air conditioner frequency converter is 220 volts, when the detected direct current bus voltage value is 150 volts and is lower than-30% of the threshold voltage value, the occurrence of undervoltage is judged. Or the open-phase detection circuit detects that the open-phase fault exists when the three-phase power supply is input and outputs an open-phase fault alarm signal, and the open-phase fault is detected; at this time, after the micro control unit MCU stops the working operation of the compressor or the fan and turns off the output of the PWM, the micro control unit MCU outputs a high level during the delay of 10ms, the two triodes are opened, the two triodes output driving currents to the power relay, the switch of the power relay is controlled to be in a closed state, the PTC1 resistor of the anti-surge circuit is in short circuit, and the residual current of the compressor or the fan flows through the switch of the power relay; after delaying for 10ms, the micro control unit MCU outputs a low level, the two triodes are cut off, and the switch of the power relay is controlled to be in a disconnected state; when the power is powered on again, the PTC1 resistor is connected into a main loop; and after the electrolytic capacitor in the main loop is charged, attracting the switch of the power relay, and then shorting the PTC1 resistor again.
It will be understood by those skilled in the art that all or part of the flow of the method according to the above-described embodiment may be implemented by a computer program, which may be stored in a computer-readable storage medium and used to implement the steps of the above-described embodiments of the method when the computer program is executed by a processor. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying said computer program code, media, usb disk, removable hard disk, magnetic diskette, optical disk, computer memory, read-only memory, random access memory, electrical carrier wave signals, telecommunication signals, software distribution media, etc. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
Further, it should be understood that, since the modules are only configured to illustrate the functional units of the system of the present invention, the corresponding physical devices of the modules may be the processor itself, or a part of software, a part of hardware, or a part of a combination of software and hardware in the processor. Thus, the number of individual modules in the figures is merely illustrative.
Those skilled in the art will appreciate that the various modules in the system may be adaptively split or combined. Such splitting or combining of specific modules does not cause the technical solutions to deviate from the principle of the present invention, and therefore, the technical solutions after splitting or combining will fall within the protection scope of the present invention.
So far, the technical solution of the present invention has been described with reference to one embodiment shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A control method of an anti-surge circuit is characterized in that,
when the direct current bus voltage of the frequency converter is under-voltage and/or the open-phase detection circuit detects the open-phase fault, after the working operation of the compressor or the fan is stopped and the output of PWM pulse width modulation is turned off, the power relay is turned off after a period of time is delayed, so that the residual current of the compressor or the fan passes through the relay.
2. The method of claim 1,
the under-voltage means that the bus voltage of the direct-current bus after rectification and filtration in the frequency converter is lower than the rated voltage;
the phase-lack fault means that one phase of a three-phase input power supply of the frequency conversion module is lacked;
if the voltage of the direct current bus of the frequency converter is lower than a preset threshold voltage, indicating that undervoltage occurs;
if the open-phase detection circuit detects that the open-phase fault exists when the three-phase power supply is input and outputs an open-phase fault alarm signal, the open-phase fault is detected;
the threshold voltage is-30% of the rated voltage value, and the rated voltage is the optimal voltage of the frequency converter during long-time normal operation.
3. The method according to claim 1, wherein "delaying the time for opening the power relay" specifically includes:
and timing by a built-in timer, and after delaying for 10ms, controlling the power relay to be switched off by an amplifying circuit.
4. The method of claim 3,
the amplification circuit includes: two triodes and one or more resistors;
the short circuit refers to a local short circuit power connection mode which does not cause damage to electronic components in a circuit and enables the electronic components to temporarily fail to work;
the PTC resistor is a thermistor having a positive temperature coefficient in which the resistance value increases as the temperature increases;
the power relay is disconnected again to a time delay to make compressor or fan residual current pass through the relay, specifically still include:
during the delay of 10ms, the two triodes control the switch of the power relay to be in a closed state, the PTC resistor of the anti-surge circuit is short-circuited, and the residual current of the compressor or the fan flows through the switch of the power relay;
after the delay is 10ms, the two triodes control the switch of the power relay to be in an off state;
when the power is powered on again, the PTC resistor is connected into the main loop;
and after the electrolytic capacitor in the main loop is charged, closing the switch of the power relay in an attracting mode, and then short-circuiting the PTC resistor again.
5. A control system of an anti-surge circuit is characterized in that,
the surge protection circuit specifically includes:
one end of the PTC resistor can be connected into the main loop, and the PTC resistor is connected with a switch of the power relay in parallel;
one end of the power relay is connected with the amplifying circuit, and the power relay is connected with a rectifying diode D1 in parallel;
when the direct current bus voltage of the frequency converter is under-voltage and/or the open-phase detection circuit detects the open-phase fault, after the working operation of the compressor or the fan is stopped and the output of PWM pulse width modulation is turned off, the amplifying circuit controls the power relay to be turned off after a period of time delay, so that the residual current of the compressor or the fan passes through the relay.
6. The system of claim 5,
the under-voltage means that the bus voltage of the direct-current bus after rectification and filtration in the frequency converter is lower than the rated voltage;
the phase-lack fault means that one phase of a three-phase input power supply of the frequency conversion module is lacked;
if the voltage of the direct current bus of the frequency converter is lower than a preset threshold voltage, indicating that undervoltage occurs;
if the open-phase detection circuit detects that the open-phase fault exists when the three-phase power supply is input and outputs an open-phase fault alarm signal, the open-phase fault is detected;
the threshold voltage is-30% of the rated voltage value, and the rated voltage is the optimal voltage of the frequency converter during long-time normal operation.
7. The system of claim 5, wherein the step of controlling the power relay to open after a time delay by the amplifying circuit specifically comprises:
timing by a built-in timer, delaying for 10ms, and then controlling the power relay to be switched off by an amplifying circuit;
during the delay of 10ms, two triodes of the amplifying circuit control the switch of the power relay to be in a closed state, the PTC resistor is short-circuited, and the residual current of the compressor or the fan flows through the switch of the power relay;
when the power is powered on again, the PTC resistor is connected into the main loop;
and after the electrolytic capacitor in the main loop is charged, closing the switch of the power relay in an attracting mode, and then short-circuiting the PTC resistor again.
8. The system of claim 7, wherein the two transistors and one or more resistors in the amplifying circuit form a switching circuit;
the drain electrode of a first triode Q1 and the drain electrode of a second triode Q2 in the two triodes are connected with one end of the power relay; resistors are respectively connected between the grid electrodes and the source electrodes of the first triode Q1 and the second triode Q2, the source electrode of the second triode Q2 is grounded, and the grid electrode of the first triode Q1 is connected with other resistors;
after the delay of 10ms, the switch circuit enters a cut-off state to open the switch of the power relay.
9. A computer-readable storage medium, wherein a plurality of program codes are stored in the storage medium, the program codes being adapted to be loaded and executed by a processor to perform the control method of the anti-surge circuit according to any one of claims 1 to 4;
alternatively, a control device comprising a processor and a memory, the memory device being adapted to store a plurality of program codes, characterized in that the program codes are adapted to be loaded and run by the processor to perform the control method of the anti-surge circuit according to any of claims 1 to 4.
10. An air conditioning apparatus, characterized in that,
the air conditioning apparatus includes the control system of the surge preventing circuit of claims 5 to 8;
alternatively, the first and second electrodes may be,
the air conditioning apparatus includes: an air conditioner inverter and a control device as claimed in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011448685.8A CN112713579A (en) | 2020-12-09 | 2020-12-09 | Control method and system of anti-surge circuit and air conditioning equipment |
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|---|---|---|---|
| CN202011448685.8A CN112713579A (en) | 2020-12-09 | 2020-12-09 | Control method and system of anti-surge circuit and air conditioning equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113890322A (en) * | 2021-08-31 | 2022-01-04 | 杭州键嘉机器人有限公司 | Soft start circuit for restraining surge current by using time delay circuit |
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2020
- 2020-12-09 CN CN202011448685.8A patent/CN112713579A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113890322A (en) * | 2021-08-31 | 2022-01-04 | 杭州键嘉机器人有限公司 | Soft start circuit for restraining surge current by using time delay circuit |
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