CN111366803B - Power supply circuit, circuit fault detection method, circuit board and vehicle-mounted air conditioner - Google Patents

Power supply circuit, circuit fault detection method, circuit board and vehicle-mounted air conditioner Download PDF

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CN111366803B
CN111366803B CN202010218720.0A CN202010218720A CN111366803B CN 111366803 B CN111366803 B CN 111366803B CN 202010218720 A CN202010218720 A CN 202010218720A CN 111366803 B CN111366803 B CN 111366803B
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component
voltage
switch
capacitor
circuit
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CN111366803A (en
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霍兆镜
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Guangzhou Hualing Refrigeration Equipment Co Ltd
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Guangzhou Hualing Refrigeration Equipment Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00421—Driving arrangements for parts of a vehicle air-conditioning
    • B60H1/00428—Driving arrangements for parts of a vehicle air-conditioning electric
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/88—Optimized components or subsystems, e.g. lighting, actively controlled glasses

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a power supply circuit, a circuit fault detection method, a circuit board, a vehicle-mounted air conditioner and a computer readable storage medium, wherein the power supply circuit comprises a booster circuit, a controller and a detection part, the booster circuit comprises a first voltage doubling part, a second voltage doubling part, a switch assembly, a first capacitor and a second capacitor, the switch assembly comprises a first switch part and a second switch part, the detection part is connected with the switch assembly to obtain a feedback voltage value of the switch assembly and output a signal value based on the feedback voltage value, the controller is connected with the detection part to obtain the signal value and adjust the conduction duration of the switch assembly according to the signal value, the detection part can obtain the feedback voltage value, and the controller can analyze and judge the signal value corresponding to the feedback voltage value and the withstand voltage value of the switch assembly to enable the feedback voltage value to be used as a judgment condition for reducing the conduction duration of the switch assembly, thereby being capable of functioning as a protection switch assembly.

Description

Power supply circuit, circuit fault detection method, circuit board and vehicle-mounted air conditioner
Technical Field
The invention relates to the technical field of electronics, in particular to a power supply circuit, a circuit fault detection method, a circuit board, a vehicle-mounted air conditioner and a computer readable storage medium.
Background
At present, a vehicle-mounted air conditioner generally adopts a battery to drive and operate, but a battery is adopted to directly drive a compressor to output very large current, so that the compressor needs to be wound by using very thick copper wires; the existing vehicle-mounted air conditioner power supply circuit generally performs voltage boosting conversion on battery voltage and then provides the battery voltage for the compressor, and the current under the same power can be reduced due to the voltage boosting, so that the aims of reducing the volume and the cost of the compressor can be fulfilled. However, the conventional boost power supply circuit generally adopts two staggered boost circuits, and two switch components are used for respectively controlling the two boost circuits to work. When one of the switch components does not work normally, for example, when the switch components are not conducted normally, the voltage value loaded on the other switch component is large and is easy to damage, so that the power supply circuit fails, and the conventional power supply circuit is not provided with a measure for detecting whether the switch components work normally or not.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a power supply circuit, a circuit fault detection method, a circuit board, a vehicle-mounted air conditioner and a computer readable storage medium, which can detect the working state of a switch component.
According to an embodiment of the first aspect of the present invention, a power supply circuit includes:
the boost circuit comprises a first voltage doubling part, a second voltage doubling part, a switch assembly, a first capacitor and a second capacitor, wherein the switch assembly comprises a first switch part and a second switch part;
a controller connected to the first and second switching parts, respectively, to periodically turn on the first and second switching parts, wherein in an on state of the first switching part, the first voltage doubling part and the first switching part form a first loop, and the second voltage doubling part, the first capacitor and the first switching part form a second loop, and in an on state of the second switching part, the second voltage doubling part and the second switching part form a third loop, and the first voltage doubling part, the second capacitor and the second switching part form a fourth loop;
the detection component is connected with the switch component to acquire a feedback voltage value of the switch component and output a signal value based on the feedback voltage value, and the controller is connected with the detection component to acquire the signal value and adjust the conduction duration of the switch component according to the signal value.
The power supply circuit in the embodiment of the first aspect of the invention has at least the following beneficial effects: when the first switch component is in a conducting state, the first voltage doubling component stores energy, and when the first switch component is in a stopping state, the first voltage doubling component releases electric energy to a load through the first capacitor; therefore, when the voltage generated by the first voltage doubling component when releasing electric energy to the load through the first capacitor is too large, the voltage loaded on the first switch component is increased, and when the voltage loaded on the first switch component is larger than the withstand voltage value of the first switch component, the first switch component is easily damaged, so that when the first switch component or the second switch component is in an off state, the detection component can obtain a feedback voltage value, and the controller can analyze and judge the signal value corresponding to the feedback voltage value and the withstand voltage value of the switch assembly, so that the feedback voltage value can be used as a judgment condition for reducing the on-time of the switch assembly, and the switch assembly can be protected.
According to some embodiments of the first aspect of the present invention, the controller determines that the switching assembly is in a fault state in response to the signal value being greater than or equal to a preset voltage threshold;
the controller reduces the conduction time of the switch assembly and/or sends out an alarm signal.
The controller can actively reduce the conduction time of the switch component according to the fault condition, so that the switch component is actively protected, or only an alarm signal is sent out, and a user can process the current fault.
According to some embodiments of the first aspect of the present invention, the detection unit includes a rectifying and sampling unit, a first filtering unit, a voltage dividing unit, a second filtering unit and a signal output end, which are connected in series in sequence, the rectifying and sampling unit is connected to the first switching unit and the second switching unit, the second filtering unit is connected between the signal output end and a reference ground, and the signal output end is used for outputting the signal value. The rectification sampling component is respectively connected with the first switch component and the second switch component so as to obtain voltage values fed back by the first switch component and the second switch component, and when any one switch component breaks down, the detection component can output a signal value to trigger the controller.
According to some embodiments of the first aspect of the present invention, the first filtering component includes a first resistor and a third capacitor, the voltage dividing component includes a second resistor and a third resistor, the rectifying and sampling component, the first resistor, the third capacitor and a reference ground are sequentially connected in series, the rectifying and sampling component, the first resistor, the second resistor, the third resistor and the reference ground are sequentially connected in series, and the signal output end is connected between the second resistor and the third resistor. The first filtering component adopts RC filtering, so that the feedback voltage value can be more stable, the voltage dividing component adopts resistance voltage division, and the feedback voltage value is divided, so that the signal value is adapted to the detection voltage range of the controller.
According to some embodiments of the first aspect of the present invention, the detection component further comprises an overvoltage protection component connected between the signal output and a reference ground. The overvoltage protection component can prevent the voltage of the signal value from being too large to impact and damage the controller.
According to some embodiments of the first aspect of the present invention, the boost circuit further comprises a first diode and a second diode, the first voltage doubling unit is connected to the second capacitor through the first diode, and the second voltage doubling unit is connected to the first capacitor through the second diode. The first diode and the second diode are used to prevent a current from flowing in a reverse direction in the booster circuit.
The circuit fault detection method according to the second aspect of the embodiment of the invention is applied to a power supply circuit, and the power supply circuit comprises the following components:
the boost circuit comprises a first voltage doubling part, a second voltage doubling part, a switch assembly, a first capacitor and a second capacitor, wherein the switch assembly comprises a first switch part and a second switch part;
a controller connected to the first switch unit and the second switch unit, respectively, wherein in an on state of the first switch unit, the first voltage doubling unit and the first switch unit form a first loop, the second voltage doubling unit, the first capacitor and the first switch unit form a second loop, in an on state of the second switch unit, the second voltage doubling unit and the second switch unit form a third loop, and the first voltage doubling unit, the second capacitor and the second switch unit form a fourth loop;
the detection component is connected with the switch assembly to acquire a feedback voltage value of the switch assembly and output a signal value based on the feedback voltage value, and the controller is connected with the detection component to acquire the signal value;
the circuit fault detection method comprises the following steps:
the controller periodically turns on the first and second switching parts;
the controller acquires a signal value based on the feedback voltage value output by the detection part;
and the controller adjusts the conduction duration of the switch component according to the signal value.
The circuit fault detection method in the embodiment of the second aspect of the invention at least has the following beneficial effects: when the first switch component is in a conducting state, the first voltage doubling component stores energy, and when the first switch component is in a stopping state, the first voltage doubling component releases electric energy to a load through the first capacitor; therefore, when the voltage generated by the first voltage doubling component when releasing electric energy to the load through the first capacitor is too large, the voltage loaded on the first switch component is increased, and when the voltage loaded on the first switch component is larger than the withstand voltage value of the first switch component, the first switch component is easily damaged, so that when the first switch component or the second switch component is in an off state, the detection component can obtain a feedback voltage value, and the controller can analyze and judge the signal value corresponding to the feedback voltage value and the withstand voltage value of the switch assembly, so that the feedback voltage value can be used as a judgment condition for reducing the on-time of the switch assembly, and the switch assembly can be protected.
According to some embodiments of the second aspect of the present invention, the controller adjusts the on-time of the switch component according to the magnitude of the signal value, including:
in response to the signal value being greater than or equal to a preset voltage threshold, the controller determining that the switch assembly is in a fault state;
the controller reduces the conduction time of the switch assembly and/or sends out an alarm signal.
A wiring board according to an embodiment of the third aspect of the present invention includes the power supply circuit as described in any one of the above.
The circuit board of the third aspect of the invention has at least the following beneficial effects: when the circuit board of the embodiment of the invention is applied, when the first switch component is in a conducting state, the first voltage doubling component can store energy, and when the first switch component is in a stopping state, the first voltage doubling component can release electric energy to a load through the first capacitor; therefore, when the voltage generated by the first voltage doubling component when releasing electric energy to the load through the first capacitor is too large, the voltage loaded on the first switch component is increased, and when the voltage loaded on the first switch component is larger than the withstand voltage value of the first switch component, the first switch component is easily damaged, so that when the first switch component or the second switch component is in an off state, the detection component can obtain a feedback voltage value, and the controller can analyze and judge the signal value corresponding to the feedback voltage value and the withstand voltage value of the switch assembly, so that the feedback voltage value can be used as a judgment condition for reducing the on-time of the switch assembly, and the switch assembly can be protected.
A vehicle air conditioner according to a fourth aspect embodiment of the invention includes the wiring board as described above;
alternatively, the first and second electrodes may be,
comprising at least one processor and a memory for communicative connection with the at least one processor; the memory stores instructions executable by the at least one processor to enable the at least one processor to perform a circuit fault detection method according to any one of the second aspects of the embodiments of the invention.
The vehicle-mounted air conditioner in the fourth aspect of the invention has at least the following beneficial effects: the vehicle-mounted air conditioner can apply the function of the power supply circuit by installing the circuit board or internally setting the circuit fault detection program to ensure that the first switch component cannot be damaged by overheating when not working normally, specifically, when the first switch component is in a conducting state, the first voltage doubling component can store energy, and when the first switch component is in a cut-off state, the first voltage doubling component can release electric energy to a load through the first capacitor; therefore, when the voltage generated by the first voltage doubling component when releasing electric energy to the load through the first capacitor is too large, the voltage loaded on the first switch component is increased, and when the voltage loaded on the first switch component is larger than the withstand voltage value of the first switch component, the first switch component is easy to damage, so that when the first switch component or the second switch component is in a cut-off state, the detection component can obtain a feedback voltage value, and the controller can analyze and judge the signal value corresponding to the feedback voltage value and the withstand voltage value of the switch assembly, so that the feedback voltage value can be used as a judgment condition for reducing the on-time of the switch assembly, and the function of protecting the switch assembly can be achieved.
According to a fifth aspect of the embodiments of the invention, the computer-readable storage medium stores computer-executable instructions for causing a computer to execute the circuit fault detection method according to any one of the second aspect of the embodiments of the invention.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a circuit configuration diagram of a first aspect of an embodiment of the invention;
FIG. 2 is a flow chart of a circuit fault detection method according to a second aspect of the embodiment of the present invention;
fig. 3 is a schematic connection diagram of a control device according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
The vehicle-mounted air conditioner adopts the booster circuit to obtain high voltage to drive the compressor, and can reduce the current in the circuit at the same power, thereby reducing the volume of the compressor and reducing the cost of components and matching circuits; at present, a booster circuit generally utilizes a switching device to realize two-way staggered output to a load, and each way realizes the energy storage and release of the circuit by opening and closing the switching device; if one of the switching devices does not work normally, for example, a control chip of the switching device is damaged, drive resistance is subjected to cold welding, the booster circuit loses the boosting function, the voltage applied to the switching device on the path is very large, the voltage is equivalent to the sum of the load voltage and the voltage drop of each component in the path, in order to ensure the safety of the switching device, the switching device with the withstand voltage value larger than the load voltage can be selected, but the manufacturing cost is increased, the type selection of the switching device is not facilitated, the product price is increased, if the switching device with the withstand voltage value lower than the load voltage is selected, the switching device can be in an overvoltage operation state, the heat productivity is increased sharply, and the short circuit of the switching device and the damage of the whole circuit are easily caused. In the case of selecting a switching device with a low withstand voltage value, the conventional boost circuit does not provide a corresponding detection measure for the possible fault, so that the reliability of the circuit is still deficient.
The power supply circuit comprises a booster circuit and a detection component aiming at the booster circuit, wherein the booster circuit adopts the periodic conduction of a switch device to realize boosting and output to a load, the detection component outputs a voltage signal to a driving chip based on the voltage value of the switch device, and the driving chip judges the working state of the switch device according to the voltage signal, so that the working mode of the switch device is controlled, and the circuit is prevented from being damaged. The embodiments of the present invention will be further explained with reference to the drawings.
Referring to fig. 1, fig. 1 is a schematic diagram of the power supply circuit, and a first aspect of the embodiment of the present invention provides a power supply circuit, including:
the boost circuit comprises a first voltage doubling part, a second voltage doubling part, a switch assembly, a first capacitor C1 and a second capacitor C2, wherein the switch assembly comprises a first switch part Q1 and a second switch part Q2;
a controller connected to the first and second switching parts Q1 and Q2, respectively, to periodically turn on the first and second switching parts Q1 and Q2, wherein in an on state of the first switching part Q1, the first voltage doubling part and the first switching part Q1 form a first loop, and the second voltage doubling part, the first capacitor C1 and the first switching part Q1 form a second loop, and in an on state of the second switching part Q2, the second voltage doubling part and the second switching part Q2 form a third loop, and the first voltage doubling part, the second capacitor C2 and the second switching part Q2 form a fourth loop;
the detection component 101 is connected with the switch component to obtain a feedback voltage value of the switch component and output a signal value based on the feedback voltage value, and the controller is connected with the detection component to obtain the signal value and adjust the conduction duration of the switch component according to the signal value.
The booster circuit adopts a circuit as shown in fig. 1, a voltage input end (shown by 24V in the figure), a first voltage doubling part and a first capacitor C1 are sequentially connected, the voltage input end, a second voltage doubling part and a second capacitor C2 are sequentially connected, the booster circuit further comprises a diode group D3, the diode group D3 is formed by connecting two diodes in parallel and is provided with a first input end and a second input end, a first capacitor C1 and a second capacitor C2 are respectively connected to a voltage output end (shown by P + in the figure) through the first input end and the second input end, the connection position of the first voltage doubling part and the first capacitor C1 is connected to the second input end, and the connection position of the second voltage doubling part and the second capacitor C2 is connected to the first input end; in terms of the switching device, a connection of the first voltage doubling part and the first capacitor C1 is connected to the reference ground through the first switching part Q1, and a connection of the second voltage doubling part and the second capacitor C2 is connected to the reference ground through the second switching part Q2. Wherein the controller is not shown in the figure.
It is understood that the first voltage doubling component and the second voltage doubling component have energy storage and energy release functions, and the specific circuit composition of the first voltage doubling component and the second voltage doubling component can be realized in various forms, for example, a single inductor is connected in series in the circuit, and referring to fig. 1, the first voltage doubling component is a first inductor L1, and the second voltage doubling component is a second inductor L2; likewise, the first switching component Q1 and the second switching component Q2 also have various implementation forms, such as MOS transistors or IGBTs; taking the first switching element Q1 and the second switching element Q2 as MOS transistors as an example, referring to fig. 1, in addition to the parasitic diodes of the MOS transistors, a zener diode, such as the fourth diode D4 and the fifth diode D5 in fig. 1, is connected in parallel in reverse direction, and the zener diode forms a clamping voltage, so that the MOS transistors can be prevented from being affected by factors such as circuit surge, and the first switching element Q1 and the second switching element Q2 can be ensured to operate stably.
The working mode of the booster circuit of the embodiment of the invention under the condition of no fault is as follows: when the first switch component Q1 is in a conducting state, the input voltage is loaded on the first voltage doubling component, and the first voltage doubling component stores energy, and similarly, when the second switch component Q2 is in a conducting state, the input voltage is loaded on the second voltage doubling component, and the second voltage doubling component stores energy; when the first switch component Q1 is in the on state and the second switch component Q2 is in the off state, in addition to the first voltage doubling component storing energy, the second voltage doubling component, the first capacitor C1 and the first switch component Q1 form a loop, so that the first capacitor C1 also stores energy, and similarly, when the first switch component Q1 is in the off state and the second switch component Q2 is in the on state, in addition to the second voltage doubling component storing energy, the first voltage doubling component, the second capacitor C2 and the second switch component Q2 form a loop, so that the second capacitor C2 also stores energy. When the first switch component Q1 is in an on state and the second switch component Q2 is in an off state, the second voltage doubling component releases energy to the first capacitor C1, meanwhile, the second voltage doubling component releases energy to the voltage output end through the second capacitor C2, a boosted voltage is obtained at the voltage output end, when the first switch component Q1 is in an off state and the second switch component Q2 is in an on state, the first voltage doubling component releases energy to the second capacitor C2, meanwhile, the first voltage doubling component releases energy to the voltage output end through the second capacitor, and a boosted voltage is obtained at the voltage output end.
The first switch component Q1 is taken as an example, when the first switch component Q1 does not work normally, the first switch component Q1 is in the off state all the time, and if the second switch component Q2 is changed from the on state to the off state, the voltage of the connection point of the first voltage doubling component and the first capacitor C1, that is, the voltage on the first switch component Q1 is equal to the sum of the load voltage and the voltage drop of the component from the first voltage doubling component to the voltage output end, so the first switch component Q1 will bear a very large voltage, and the circuit may be damaged. Similarly, when the second switch Q2 is not operating properly, the second switch Q2 will be subjected to a very large voltage, and the circuit may be damaged.
In view of the above, in one embodiment,
in response to the signal value being greater than or equal to the preset voltage threshold, the controller determines that the switch assembly is in a fault state;
the controller reduces the conduction time of the switch component and/or sends out an alarm signal.
In the embodiment of the present invention, the detecting component 101 is adopted to detect the voltages on the first switch component Q1 and the second switch component Q2 and output signal values to the controller, for convenience of description, the first signal value corresponds to the collected value of the first switch component Q1 output by the detecting component 101, the collected value of the first switch component Q1 is represented as a first signal value, the second signal value corresponds to the collected value of the second switch component Q2 output by the detecting component 101, and the collected value of the second switch component Q2 is represented as a second signal value; taking the first switch component Q1 as an example, the controller is configured to drive the first switch component Q1 to conduct periodically, and the controller determines whether the first switch component Q1 does not work normally according to the magnitude of a preset voltage threshold, and if the first signal value is greater than or equal to the preset voltage threshold, the controller determines that the first switch component Q1 is in a fault state, and the controller reduces the conduction duration of the switch assembly, so as to reduce the voltage output power, and prevent the first switch component Q1 in the circuit from being damaged due to overheating (the conduction duration of the second switch component Q2 is also reduced), so that the rear-stage device can work in a limited manner. It can be understood that, since the detecting component 101 is also a voltage input/output circuit, the detecting component 101 may adopt different circuit forms, such as a voltage converting circuit, and utilize a voltage converting chip to adjust the value of the output voltage, such as a voltage dividing filter circuit, on the premise that the output first signal value is within the signal sampling range of the controller, and reduce the output voltage in a voltage dividing form, and utilize component filtering to stabilize the voltage output. Similarly, when the second switching element Q2 fails, protection is performed by the failure handling means of the first switching element Q1.
In one embodiment, the boost circuit further includes a first diode D1 and a second diode D2, the first voltage doubling unit is connected to the second capacitor C2 through the first diode D1, and the second voltage doubling unit is connected to the first capacitor C1 through the second diode D2. In this embodiment, the first diode D1 is connected in series between the first voltage-multiplying component and the second input terminal, the second diode D2 is connected in series between the second voltage-multiplying component and the first input terminal, and the first diode D1 and the second diode D2 are used for suppressing reverse currents at the first input terminal and the second input terminal, so as to ensure normal operation of the voltage boost circuit.
In an embodiment, the boost circuit further includes an energy storage component E1, and the energy storage component E1 is configured to boost and convert the electric energy released by the first voltage doubling component and the second voltage doubling component and output the converted electric energy to the load. Referring to fig. 1, the energy storage element E1 is connected in series between the voltage output terminal and the reference ground, and when the first voltage doubling element or the second voltage doubling element is in a de-energized state, the energy storage element E1 can obtain the electric energy released by the first voltage doubling element or the second voltage doubling element, so as to provide a stable voltage for the voltage output terminal.
In an embodiment, the detection component 101 includes a rectifying and sampling component, a first filtering component, a voltage dividing component, a second filtering component and a signal output end, which are sequentially connected in series, wherein the rectifying and sampling component is connected to the first switching component Q1, the second filtering component is connected between the signal output end and a reference ground, and the signal output end is used for outputting a signal value.
The detection of the voltage on the switching component, actually the detection of the voltages of the first switching component Q1 and the second switching component Q2, in order to reduce the usage of circuit components, the detection circuit of the present embodiment adopts a form that the first switching component Q1 and the second switching component Q2 are connected in parallel to the detection component 101, referring to fig. 1, the first switching component Q1 and the second switching component Q2 are respectively connected to a rectification sampling component, the rectification sampling component includes a sixth diode D6 and a seventh diode D7, the anode of the sixth diode D6 is connected to the connection of the first switching component Q1 and the first voltage doubling component, the anode of the seventh diode D7 is connected to the connection of the second switching component Q2 and the second voltage doubling component, and the cathode of the sixth diode D6 and the cathode of the seventh diode D7 are both connected to the first filtering component; the sixth diode D6 and the seventh diode D7 rectify the input voltage while sampling the input voltage, and as can be seen from the circuit structure, when a voltage value is large due to a fault of any one of the first switch component Q1 and the second switch component Q2, a higher voltage signal can be obtained at the output end of the detection component 101, and if the voltage signal exceeds a first preset voltage threshold or a second preset voltage threshold, the controller simultaneously reduces the on-time of the first switch component Q1 and the second switch component Q2, and in this process, it is not necessary to determine whether the first switch component Q1 or the second switch component Q2 is in a fault state, and the controller also controls the first switch component Q1 and the second switch component Q2 simultaneously, so that the use of circuit components is reduced, and the circuit cost is reduced. It can be understood that, in addition to the above-mentioned circuit structure of two inputs and one output, the detecting component 101 may also adopt a structure of two inputs and two outputs, that is, two independent branches are formed in the detecting component 101, and the two branches respectively output the corresponding first signal value and the second signal value.
In one embodiment, the first filtering part comprises a first resistor R1 and a third capacitor C3, the voltage dividing part comprises a second resistor R2 and a third resistor R3, the rectifying and sampling part, the first resistor R1, the third capacitor C3 and a reference ground are sequentially connected in series, the rectifying and sampling part, the first resistor R1, the second resistor R2, the third resistor R3 and the reference ground are sequentially connected in series, and the signal output end is connected between the second resistor R2 and the third resistor R3.
Based on the two paths of the rectifying and sampling components which input and output one path, an RC filter circuit is adopted for filtering, a voltage dividing component is in butt joint with the output of the first filter component and divides the voltage by adopting a resistor series circuit, the first filter component provides a stable voltage signal for a rear-stage circuit, and the voltage dividing component divides the voltage after filtering so that the voltage signal input to the controller meets the signal sampling range of the controller; the voltage dividing circuit may also discharge the third capacitor C3 so that the voltage of the third capacitor C3 may follow the voltage fluctuations of the first and second switching components Q1 and Q2, thereby enabling the controller to detect the voltage fluctuations of the first and second switching components Q1 and Q2 in real time.
In an embodiment, the second filtering component is a fourth capacitor C4, the fourth capacitor C4 is connected in parallel with the third resistor R3, and the fourth capacitor C4 and the second resistor R2 form an RC filtering circuit, so as to filter the voltage signal after voltage division and filter a high-frequency interference signal in the voltage signal.
In one embodiment, the detection component 101 further includes an overvoltage protection component D8, and the overvoltage protection component D8 is connected between the signal output terminal and the reference ground. The overvoltage protection component D8 provides overvoltage protection for the controller to prevent the voltage value input to the sampling end of the controller from exceeding the voltage sampling range and damaging the controller, so the overvoltage protection component D8, as a clamping device, can be selected from a variety of different options, for example, a zener diode, can conduct a reference ground when the voltage value exceeds the breakdown voltage, e.g., a triode, the control end voltage of the triode is taken from the output voltage of the second filtering component, the collector of the triode is connected to the signal output end, the emitter of the triode is connected to the reference ground, and when the control end of the triode is in a high level state, conduction is conducted between the collector and the emitter to ground the voltage output.
Referring to fig. 2 and 3, fig. 2 and 3 are flowcharts of a circuit fault detection method, and a second aspect of the embodiment of the present invention provides a circuit fault detection method applied to a power supply circuit, where the power supply circuit includes:
the boost circuit comprises a first voltage doubling part, a second voltage doubling part, a switch assembly, a first capacitor C1 and a second capacitor C2, wherein the switch assembly comprises a first switch part Q1 and a second switch part Q2;
a controller respectively connected to the first switch Q1 and the second switch Q2, wherein in the on state of the first switch Q1, the first voltage doubling unit and the first switch Q1 form a first loop, the second voltage doubling unit, the first capacitor C1 and the first switch Q1 form a second loop, in the on state of the second switch Q2, the second voltage doubling unit and the second switch Q2 form a third loop, and the first voltage doubling unit, the second capacitor C2 and the second switch Q2 form a fourth loop;
a detection part 101 connected with the switch assembly to acquire a feedback voltage value of the switch assembly and output a signal value based on the feedback voltage value, and a controller connected with the detection part 101 to acquire the signal value;
the circuit fault detection method comprises the following steps:
s201, the controller periodically turns on the first switching component Q1 and the second switching component Q2;
s202, the controller acquires a signal value based on the feedback voltage value output by the detection part 101;
s203, the controller adjusts the conduction duration of the switch component according to the signal value.
The boost circuit of the present embodiment may be the same as or different from the boost circuit of the first embodiment of the present invention in circuit structure, and the detection unit 101 may be used as long as a circuit that uses two or more switching devices to perform charging and alternately discharges energy to a load is satisfied. For convenience of explanation, the booster circuit in fig. 1 will be described as an example, but the detection unit 101 is not limited to be applied only to the boosted voltage shown in fig. 1.
The controller of the present embodiment is a driving device for the first switching component Q1 and the second switching component Q2, and is capable of periodically turning on the first switching component Q1 and the second switching component Q2, and by changing the on-time periods of the first switching component Q1 and the second switching component Q2, the controller can adjust the output duty ratios of the first switching component Q1 and the second switching component Q2 so as to obtain different voltages at the voltage output end of the voltage boosting circuit. The controller has various implementation forms, for example, a packaged driving chip, or a non-packaged driving circuit, and whatever form of controller should have a function of controlling the first switching component Q1 and the second switching component Q2 according to the voltage value fed back by the detection component 101, that is, a driving port for the first switching component Q1 and the second switching component Q2 and a feedback port for receiving the voltage signal of the detection component 101 should be included.
The circuit fault detection method of the embodiment is specifically as follows:
taking the first switch component Q1 as an example, the first switch component Q1 is a MOS transistor, and includes a drain D, a source S and a gate B, the source S of the first switch component Q1 is connected to the reference ground, so the voltage value sampled by the detection component 101 is the voltage difference V between the drain D and the source S of the first switch component Q1DSLet the breakdown voltage of the first switching component Q1 be VBDNormally operating in the first switching element Q1In this case, the first voltage value V of the first switching component Q1DSLess than the output voltage, it is apparent that the breakdown voltage V of the first switching component Q1BDIs greater than the output voltage; when the first switch component Q1 does not work normally and the second switch component Q2 is switched to the cut-off state, the boosting circuit loses the boosting function, and the first voltage value V on the first switch component Q1 is considered to be the voltage drop of each component in the circuitDSIs the sum of the output voltage and the voltage drop of each component, and the voltage dividing component in the detecting component 101 is considered, and the first signal value and the first voltage value V are based on the voltage dividing ratioDSIn a linear proportional relationship, the first preset voltage threshold can be set to be n x V in the controllerBDWherein 0 is<n<1, if the controller detects that the first signal value output by the detection component 101 is greater than or equal to a first preset voltage threshold, determining that the first switch component Q1 is in a fault state, and at the moment, the controller reduces the conduction time of the first switch component Q1, so as to reduce the output voltage of the booster circuit until the first signal value is less than the first preset voltage threshold; through the regulation, the final output voltage of the booster circuit is reduced, the first voltage value on the first switch component Q1 returns to the safety range, and overheating damage cannot occur; still alternatively, the controller may issue a warning according to the fault condition, for example, a buzzer sounds, or the LED module emits light to warn the user to deal with the fault. Similarly, with respect to the second switching element Q2, the circuit failure detection method thereof is similar to that described above, and in order to avoid repetition, description thereof will not be repeated.
A third aspect of the embodiments of the present invention provides a circuit board, including the power supply circuit of any one of the embodiments of the first aspect of the present invention, where the power supply circuit is carried by the circuit board, and the circuit board having the function of the power supply circuit can be directly mounted in a device, when the circuit board of the embodiments of the present invention is applied, when the first switch component Q1 is in an on state, the first voltage doubling component stores energy, and when the first switch component Q1 is in an off state, the first voltage doubling component releases electric energy to a load through the first capacitor C1; therefore, when the voltage generated when the first voltage doubling unit discharges the power to the load through the first capacitor C1 is too large, the voltage applied to the first switching unit Q1 increases, and when the voltage applied to the first switching unit Q1 is greater than the withstand voltage of the first switching unit Q1, the first switching unit Q1 is easily damaged, so that when the first switching unit Q1 is in the off state, the first voltage of the first switching unit Q1 can be obtained, and the first voltage and the withstand voltage of the first switching unit Q1 can be analyzed and determined, so that the first voltage can be used as a determination condition for reducing the on-time of the first switching unit Q1, and the function of protecting the first switching unit Q1 can be performed.
A fourth aspect of the embodiments of the present invention provides a vehicle-mounted air conditioner, including the circuit board of the third aspect of the present invention, or including at least one processor and a memory for communication connection with the at least one processor; the memory stores instructions executable by the at least one processor to cause the at least one processor to perform the circuit fault detection method of any one of the second aspects.
Referring to fig. 3, fig. 3 is a schematic diagram of a control device 300 according to an embodiment of the present invention. The vehicle-mounted air conditioner may be provided with a control device 300, specifically, the control device 300 may be integrated with the vehicle-mounted air conditioner, or may be accessed to the vehicle-mounted air conditioner through an external interface or the like; the control device 300 includes a control processor 301 and a memory 302, and in fig. 3, one control processor 301 and one memory 302 are taken as an example.
The control processor 301 and the memory 302 may be connected by a bus or other means, and fig. 3 illustrates the connection by a bus as an example.
The memory 302, which is a non-transitory computer-readable storage medium, may be used to store non-transitory software programs as well as non-transitory computer-executable programs. Further, the memory 302 may include high-speed random access memory 302, and may also include non-transitory memory 302, such as at least one piece of disk memory 302, flash memory device, or other non-transitory solid-state memory 302. In some embodiments, the memory 302 may optionally include memory 302 located remotely from the control processor 301, and these remote memories 302 may be connected to the control device 300 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Those skilled in the art will appreciate that the device configuration shown in fig. 3 does not constitute a limitation of control device 300, and may include more or fewer components than shown, or some components may be combined, or a different arrangement of components.
In the vehicle-mounted air conditioner of the fourth aspect of the present invention, by installing the circuit board or by embedding the circuit fault detection program, the function of the power supply circuit may be applied to ensure that the boost circuit is not damaged by overheating when the first switch component Q1 or the second switch component Q2 of the boost circuit does not work normally, and a corresponding fault alarm device may be disposed on the vehicle-mounted air conditioner, and when the detection component 101 triggers the protection function of the controller, the output voltage of the boost circuit decreases, so that the vehicle-mounted air conditioner operates in the frequency-limited mode, and may not meet the current refrigeration requirement, and at this time, a warning may be issued by the fault alarm device to let the user handle the fault.
A fifth aspect of the embodiments of the present invention provides a computer-readable storage medium storing computer-executable instructions, which are executed by one or more control processors, for example, by one of the control processors 301 in fig. 3, and can cause the one or more control processors 301 to execute the circuit fault detection method in the above-described method embodiments, for example, execute the above-described method steps S201 to S203 in fig. 2.
The above described embodiments of the apparatus are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, may be located in one place, or may be distributed over a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
One of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the foregoing and various other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention.

Claims (11)

1. A power supply circuit, comprising:
the boost circuit comprises a first voltage doubling part, a second voltage doubling part, a switch assembly, a first capacitor and a second capacitor, wherein the switch assembly comprises a first switch part and a second switch part;
a controller connected to the first and second switching parts, respectively, to periodically turn on the first and second switching parts, wherein in an on state of the first switching part, the first voltage doubling part and the first switching part form a first loop, and the second voltage doubling part, the first capacitor and the first switching part form a second loop, and in an on state of the second switching part, the second voltage doubling part and the second switching part form a third loop, and the first voltage doubling part, the second capacitor and the second switching part form a fourth loop;
the detection component is connected with the switch component to acquire a feedback voltage value of the switch component and output a signal value based on the feedback voltage value, and the controller is connected with the detection component to acquire the signal value and adjust the conduction duration of the switch component according to the signal value.
2. The power supply circuit of claim 1, wherein the controller determines that the switching component is in a fault state in response to the signal value being greater than or equal to a preset voltage threshold;
the controller reduces the conduction time of the switch assembly and/or sends out an alarm signal.
3. The power supply circuit according to claim 1, wherein the detection component comprises a rectifying and sampling component, a first filtering component, a voltage division component, a second filtering component and a signal output end which are sequentially connected in series, the rectifying and sampling component is connected with the first switching component and the second switching component, the second filtering component is connected between the signal output end and a reference ground, and the signal output end is used for outputting the signal value.
4. The power supply circuit according to claim 3, wherein the first filtering component comprises a first resistor and a third capacitor, the voltage dividing component comprises a second resistor and a third resistor, the rectifying and sampling component, the first resistor, the third capacitor and a reference ground are sequentially connected in series, the rectifying and sampling component, the first resistor, the second resistor, the third resistor and the reference ground are sequentially connected in series, and the signal output end is connected between the second resistor and the third resistor.
5. The power supply circuit of claim 4 wherein said detection component further comprises an overvoltage protection component, said overvoltage protection component connected between said signal output and a reference ground.
6. The power supply circuit according to claim 1, wherein the voltage boosting circuit further comprises a first diode and a second diode, the first voltage multiplying unit is connected to the second capacitor through the first diode, and the second voltage multiplying unit is connected to the first capacitor through the second diode.
7. The circuit fault detection method is characterized by being applied to a power supply circuit, wherein the power supply circuit comprises:
the boost circuit comprises a first voltage doubling part, a second voltage doubling part, a switch assembly, a first capacitor and a second capacitor, wherein the switch assembly comprises a first switch part and a second switch part;
a controller connected to the first switch unit and the second switch unit, respectively, wherein in an on state of the first switch unit, the first voltage doubling unit and the first switch unit form a first loop, the second voltage doubling unit, the first capacitor and the first switch unit form a second loop, in an on state of the second switch unit, the second voltage doubling unit and the second switch unit form a third loop, and the first voltage doubling unit, the second capacitor and the second switch unit form a fourth loop;
the detection component is connected with the switch assembly to acquire a feedback voltage value of the switch assembly and output a signal value based on the feedback voltage value, and the controller is connected with the detection component to acquire the signal value;
the circuit fault detection method comprises the following steps:
the controller periodically turns on the first and second switching parts;
the controller acquires a signal value based on the feedback voltage value output by the detection part;
and the controller adjusts the conduction duration of the switch component according to the signal value.
8. The method of claim 7, wherein the adjusting the on-time of the switch assembly according to the magnitude of the signal value by the controller comprises:
in response to the signal value being greater than or equal to a preset voltage threshold, the controller determining that the switch assembly is in a fault state;
the controller reduces the conduction time of the switch assembly and/or sends out an alarm signal.
9. Circuit board, characterized in that it comprises a supply circuit according to any one of claims 1 to 6.
10. A vehicle air conditioner characterized by comprising the wiring board of claim 9;
alternatively, the first and second electrodes may be,
comprising at least one processor and a memory for communicative connection with the at least one processor; the memory stores instructions executable by the at least one processor to enable the at least one processor to perform a circuit fault detection method according to any one of claims 7 to 8.
11. A computer-readable storage medium storing computer-executable instructions for causing a computer to perform the circuit fault detection method according to any one of claims 7 to 8.
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