Switching power supply circuit and air conditioner

Abstract

The embodiment of the utility model provides a switching power supply circuit and an air conditioner, and relates to the technical field of air conditioner power supply circuits. In the switching power supply circuit, a power supply chip installation area is used for accessing a to-be-identified chip; the identification module is used for sending different signals to the switch switching module when different power supply chips are connected into the power supply chip mounting area; the switch switching module is used for enabling the voltage detection pin of the power supply chip installation area to conduct the corresponding voltage conversion module according to the signal sent by the identification module; the voltage conversion module is used for converting an input voltage into a voltage suitable for a voltage detection pin of a chip to be identified. The switching power supply circuit connects the corresponding voltage conversion module to the voltage detection pin of the power supply chip according to the identified power supply chip, so that the switching power supply circuit can be connected to power supply chips of different manufacturers, and the compatibility of the circuit is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of air conditioner power supply circuits, in particular to a switching power supply circuit and an air conditioner. BACKGROUND

[0002] The switching power supply is an important component of the air conditioner and is responsible for providing voltage to subsequent loads.

[0003] The overvoltage and undervoltage protection values of power supply chips of different manufacturers are different, and the existing circuit can only access the power supply chips of one manufacturer.

[0004] How to improve the compatibility of the circuit so that the circuit can access the power supply chips of different manufacturers is a technical problem to be solved by the application. CONTENT OF THE UTILITY MODEL

[0005] The application aims to provide a switching power supply circuit and an air conditioner to solve the technical problem of how to improve the compatibility of the circuit so that the circuit can access the power supply chips of different manufacturers in the prior art.

[0006] To achieve the above-mentioned purpose, the embodiments of the application adopt the following technical solutions.

[0007] In a first aspect, the embodiments of the application provide a switching power supply circuit, comprising a power supply chip mounting area, an identification module, a switch switching module and at least two voltage conversion modules.

[0008] The power supply chip mounting area is coupled with the identification module, the identification module is connected with the switch switching module, and the voltage detection pin of the power supply chip mounting area is connected with each voltage conversion module through the switch switching module.

[0009] The power supply chip mounting area is used for accessing a to-be-identified chip, and the to-be-identified chip is one of at least two kinds of power supply chips.

[0010] The identification module is used for sending different signals to the switch switching module when different power supply chips are accessed in the power supply chip mounting area.

[0011] The switch switching module is used for making the voltage detection pin of the power supply chip mounting area conductive to the voltage conversion module corresponding to the signal sent by the identification module.

[0012] The voltage conversion module is used for converting the input voltage into a voltage suitable for the voltage detection pin of the to-be-identified chip.

[0013] Optionally, the switching power supply circuit further comprises a transformer and a voltage stabilizing output module.

[0014] The power chip mounting area is connected with the primary winding and the auxiliary winding of the transformer;

[0015] The secondary winding of the transformer is connected with the input end of the voltage stabilizing output module;

[0016] The output end of the voltage stabilizing output module is connected with the input end of the identification module;

[0017] The output end of the identification module is connected with the switch switching module.

[0018] Optionally, the identification module comprises a voltage comparator;

[0019] The first input end of the voltage comparator is connected with the output end of the voltage stabilizing output module;

[0020] The second input end of the voltage comparator is connected with the voltage detection pin of the power chip mounting area;

[0021] The output end of the voltage comparator is connected with the switch switching module.

[0022] Optionally, the voltage stabilizing output module comprises a DCDC chip.

[0023] Optionally, the voltage conversion module comprises a first voltage conversion module and a second voltage conversion module;

[0024] The switch switching module comprises a first switch and a second switch;

[0025] The voltage detection pin of the power chip mounting area is connected with the first voltage conversion module through the first switch;

[0026] The voltage detection pin of the power chip mounting area is connected with the second voltage conversion module through the second switch;

[0027] In the case that the first switch is connected with the first voltage conversion module through the first switch, the first switch is turned on when the first kind of power chip is connected with the power chip mounting area;

[0028] In the case that the second switch is connected with the second voltage conversion module through the second switch, the second switch is turned on when the second kind of power chip is connected with the power chip mounting area.

[0029] Optionally, the first switch and the second switch are coupled so that the states of the first switch and the second switch are opposite.

[0030] Optionally, the first switch is a normally closed relay, and the second switch is a normally open relay.

[0031] Optionally, different voltage conversion modules comprise resistance modules with different resistance values.

[0032] Optionally, the switch power supply circuit further comprises a first resistance module;

[0033] The voltage conversion module comprises a second resistance module and a third resistance module.

[0034] The input power of the power chip mounting area is connected to the first end of the first resistance module, and the second end of the first resistance module is connected to the first end of the switch switching module and the voltage detection pin of the power chip mounting area.

[0035] The second end of the switch switching module is grounded through the second resistance module.

[0036] The third end of the switch switching module is grounded through the third resistance module.

[0037] The switch switching module is used to make the voltage detection pin of the power chip mounting area conductive to one of the second resistance module and the third resistance module according to the signal sent by the identification module.

[0038] In a second aspect, the embodiments of the present application provide an air conditioner comprising the switch power supply circuit of the first aspect.

[0039] Compared with the prior art, the present application has the following beneficial effects:

[0040] The switch power supply circuit provided by the embodiments of the present application can identify different power chips, and connect the corresponding voltage conversion module to the voltage detection pin of the power chip according to the identified power chip, so that different manufacturers' power chips can be accessed, and the compatibility of the circuit is improved. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0042] Figure 1 It is a schematic diagram of a switch power supply circuit which can only access one kind of power chip;

[0043] Figure 2 It is a schematic diagram of an embodiment provided by the embodiments of the present application, which uses resistance voltage division principle as the principle of voltage conversion module;

[0044] Figure 3 It is a schematic diagram of a switch power supply circuit provided by the embodiments of the present application, which is suitable for the second kind of power chip;

[0045] Figure 4A switching power supply circuit diagram capable of accessing different types of power supply chips is provided for the embodiment of the present application.

[0046] Figure 5 A switching power supply circuit diagram including a transformer and a voltage stabilizing output module is provided for the embodiment of the present application.

[0047] Figure 6 A recognition module diagram that can be realized by the principle of a voltage comparator is provided for the embodiment of the present application.

[0048] Figure 7 A switching module diagram including a first switch and a second switch is provided for the embodiment of the present application.

[0049] Figure 8 A switching power supply circuit diagram including a first resistance module, a voltage conversion module including a second resistance module and a third resistance module is provided for the embodiment of the present application.

[0050] Figure 9 A switching power supply circuit diagram capable of accessing different types of power supply chips is provided for the embodiment of the present application. Figure 2 、 Figure 3 A switching power supply circuit diagram capable of accessing different types of power supply chips is provided for the embodiment of the present application. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. The described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application described in the drawings herein can be arranged and designed in various different configurations.

[0052] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application. The embodiments described below and the features in the embodiments can be combined with each other without conflict.

[0053] In the description of the present application, it should be noted that:

[0054] The relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or sequence between the entities or operations;

[0055] "connected" should be interpreted broadly, for example, can be fixed connection, or detachable connection, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium.

[0056] As Figure 1 , Figure 1 A switching power supply circuit is shown, the input voltage connection end is connected to the power chip and the voltage conversion module, the voltage detection pin of the power chip is connected to the voltage conversion module, the voltage conversion module converts the input voltage of the input voltage connection end into a voltage suitable for the voltage detection pin of the power chip to receive, and the power chip can judge overvoltage or judge undervoltage and the like according to the voltage of the voltage detection pin.

[0057] Figure 2 An embodiment is shown in which the resistance voltage division principle is used as the principle of the voltage conversion module, wherein U1 is a power chip, named first power chip, and the input voltage received by the first power chip U1 is a direct current voltage, i.e. DC+ in the figure. The direct current voltage can be the voltage output by a rectifier.

[0058] The input direct current voltage, the 7th pin and the 8th pin of the first power chip U1 are connected to the primary winding port of the transformer, i.e. the 1st end and the 2nd end of the transformer in the figure, and the auxiliary winding of the transformer is connected to the 5th pin of the first power chip U1 through the 5th end and the 6th end. The transformer can have multiple secondary windings, and the secondary windings output different voltages, for example, 15V, 12V, 6V, etc. required by the load, wherein the 6V voltage is output through a voltage stabilizing module. The 7th end, the 8th end, the 9th end, the 10th end, the 11th end and the 12th end of the transformer in the figure are the secondary winding ports.

[0059] The BR pin of the first power chip U1 is a voltage detection pin, when the voltage at the voltage detection pin is <0.7V, the first power chip U1 performs undervoltage protection, and when the voltage at the voltage detection pin is >2.8V, the first power chip U1 performs overvoltage protection.

[0060] The first power chip U1 is used in combination with R167, R168, R169, R170 and R181, so that the voltage at the BR pin is obtained. The resistance values of R167, R168, R169, R170 and R181 in the figure are 470kΩ, 470kΩ, 470kΩ, 180kΩ and 15kΩ, respectively.

[0061] At this time, the input voltage VDC+ and the voltage VBR at the BR pin can be calculated according to the following formula:

[0062] VDC+ = (R167 + R168 + R169 + R170 + R181) * VBR / R181

[0063] Since 0.7V is the under-voltage protection value, 0.7V is substituted into VBR, and VDC+ = 1605*0.7 / 15V = 74.9V is calculated. Therefore, the circuit meets the requirement of the minimum operating voltage 75V in the test standard.

[0064] The over-voltage protection value is designed according to AC 330V. The DC voltage sampling current is:

[0065]

[0066] The current flowing through R182 / / R184 is:

[0067]

[0068] Calculate the resistance

[0069] The resistance of R182, R184 can be set to 20kΩ, 30kΩ respectively.

[0070] When the over-voltage protection typical value is 2.8V, the over-voltage protection voltage is AC 343V;

[0071] When the over-voltage protection minimum value is 2.6V, the over-voltage protection voltage is AC 309V.

[0072] The first power supply chip described above is used as the first power supply chip, Figure 3 The switching power supply circuit suitable for the second power supply chip is shown, the second power supply chip and the first power supply chip can be different models or from different manufacturers, and the second power supply chip is Figure 3 The second power supply chip U2 in the second power supply chip U2. When the voltage detection pin of the second power supply chip U2 is less than 4.8V, the second power supply chip U2 performs under-voltage protection, and the second power supply chip U2 has no over-voltage protection. Figure 2 R171, R182, R184, D22, D23 in the second power supply chip U2 can not be installed. The voltage VBR at the voltage detection pin can be calculated as:

[0073] VBR = VDC*R181 / (R167+R168+R169+R170+R181)

[0074] The under-voltage protection value is 4.8V, VDC is the minimum operating voltage 75V, and the following is obtained:

[0075] R181 = 108.7kΩ, and R181 is adjusted to 100kΩ.

[0076] The above embodiment can only connect one power supply chip. When two power supply chips from different manufacturers are connected in the circuit, although they are pin-pin connected, the over-voltage and under-voltage protection values of the two power supply chips are different, and therefore the switching circuit of the different manufacturers needs to adjust part of the circuit when applied in the circuit. That is, when a different power supply chip is installed, the resistor and other devices need to be replaced, and the compatibility is not good.

[0077] As Figure 4 , the embodiment of the present application provides a switching power supply circuit, which comprises a power supply chip mounting area, an identification module, a switching module and at least two voltage conversion modules.

[0078] The power supply chip mounting area is coupled with the identification module, the identification module is connected with the switching module, and the voltage detection pin of the power supply chip mounting area is connected with each voltage conversion module through the switching module.

[0079] The power supply chip mounting area is used for connecting a chip to be identified, and the chip to be identified is one of at least two power supply chips. The voltage conversion module is used for converting an input voltage into a voltage suitable for the voltage detection pin of the chip to be identified.

[0080] The identification module is used for sending different signals to the switching module when different power supply chips are connected in the power supply chip mounting area.

[0081] The switching module is used for making the voltage detection pin of the power supply chip mounting area conductive to the voltage conversion module corresponding to the signal sent by the identification module according to the signal sent by the identification module. For example, when the signal sent by the identification module is a first signal, it indicates that the chip to be identified is a first power supply chip, and the voltage detection pin of the power supply chip mounting area is made conductive to the first voltage conversion module; when the signal sent by the identification module is a second signal, it indicates that the chip to be identified is a second power supply chip, and the voltage detection pin of the power supply chip mounting area is made conductive to the second voltage conversion module. Therefore, power supply chips from different manufacturers can be connected, and the compatibility of the circuit is improved.

[0082] As Figure 5 , the switching power supply circuit can comprise a transformer and a voltage stabilizing output module, the voltage stabilizing output module can comprise a DCDC chip, the switching power supply manufacturer can realize independent switching by voltage feedback comparison, the transformer auxiliary winding is connected to the feedback ground, the strong and weak ground isolation is realized by cooperating with the use of an optical coupler, and the following connection relationship is realized.

[0083] The power supply chip mounting area is connected with the primary winding and the auxiliary winding of the transformer;

[0084] The secondary winding of the transformer is connected with the input end of the voltage stabilizing output module;

[0085] The output end of the voltage stabilizing output module is connected with the input end of the identification module;

[0086] The output end of the identification module is connected to the switch switching module.

[0087] The identification module can be realized by the principle of voltage comparator, such as Figure 6 The following connection relationship exists:

[0088] The first input end of the voltage comparator is connected to the output end of the voltage stabilizing output module;

[0089] The second input end of the voltage comparator is connected to the voltage detection pin of the power chip mounting area;

[0090] The output end of the voltage comparator is connected to the switch switching module.

[0091] For example Figure 7 , Figure 7 Two switch control switching modes are shown, the switch switching module includes a first switch and a second switch, and the voltage conversion module includes a first voltage conversion module and a second voltage conversion module. Different voltage conversion modules can include resistance modules with different resistance values. The following connection relationship exists:

[0092] The voltage detection pin of the power chip mounting area is connected to the first voltage conversion module through the first switch;

[0093] The voltage detection pin of the power chip mounting area is connected to the second voltage conversion module through the second switch;

[0094] In the case of connecting the first type of power chip to the power chip mounting area, the first switch is turned on;

[0095] In the case of connecting the second type of power chip to the power chip mounting area, the second switch is turned on.

[0096] The first switch and the second switch are coupled so that the states of the first switch and the second switch are opposite. In one embodiment, the first switch is a normally closed relay, and the second switch is a normally open relay. The control ends of the first switch and the second switch are connected to the same signal. For example, the control ends of the first switch and the second switch can be connected through an inverter.

[0097] For example Figure 8 , the switching power supply circuit can further include a first resistance module, and the voltage conversion module can include a second resistance module and a third resistance module. The following connection relationship exists:

[0098] The input power of the power chip mounting area is connected to the first end of the first resistance module, and the second end of the first resistance module is connected to the first end of the switch switching module and the voltage detection pin of the power chip mounting area;

[0099] The second end of the switch switching module is connected to the ground through the second resistance module;

[0100] The third end of the switch switching module is grounded through the third resistance module;

[0101] The switch switching module is used for making the voltage detection pin of the power supply chip mounting area conduct to one of the second resistance module and the third resistance module according to the signal sent by the identification module.

[0102] Figure 9 The two chip compatible embodiments shown in Figure 2 , Figure 3 DC+ voltage of 220V is input, and V BR is obtained through voltage division of R167, R168, R169 and R170, and then input to one input end of the voltage comparator U3, and the voltage 3.3V output by the power supply chip after winding is input to the other input end of the voltage comparator U3, the voltage comparator U3 compares, and outputs high and low levels to control the normally closed relay K1 and the normally open relay K2, and then intelligently judges the access of the second resistance module and the third resistance module, for example, the following cases exist:

[0103] ① Case one: when the above first power supply chip is accessed and the input is AC 220V direct current through the rectifier bridge, the normally closed relay K1 is closed in the initial state, the voltage at the BR pin of the first power supply chip is 2.9V, the voltage comparator U3 compares 3.3V at the positive input end with 2.9V at the negative input end, and outputs high level 12V, the normally closed relay K1 is continuously closed, the normally open relay K2 is continuously opened, and the circuit correctly runs.

[0104] ② Case two: when the above second power supply chip is accessed and the input is AC 220V direct current through the rectifier bridge, the normally closed relay K1 is closed in the initial state, the voltage at the BR pin of the second power supply chip is 2.9V<4.8V, the second power supply chip enters low voltage protection, at this time the output voltage of the second power supply chip is 0V, the voltage comparator U2 compares 0V at the positive input end with 2.9V at the negative input end, and outputs low level 0V, the normally closed relay K1 is opened, the normally open relay K2 is closed, the circuit switching is completed, the voltage at the BR pin of the second power supply chip is 14.8V, and the circuit correctly runs.

[0105] Based on the above embodiment, the application also provides an air conditioner, which comprises the above switch power supply circuit, can adapt to different manufacturers and different models of switch power supply chips, and does not need to change the switch power supply circuit on the mainboard when the air conditioner replaces the chip (can use the backup chip to replace), realizes the compatibility of the switch power supply, and improves the generalization rate.

[0106] Overall, the application proposes a technology for identifying chips according to chip over-voltage and under-voltage protection characteristics, and then controlling the circuit to intelligently access, thereby increasing the versatility of the circuit when accessing different chips. The circuit judges the chip by inputting the bus DC voltage into the BR detection pin of the power supply chip, and then selects the circuit.

[0107] The device and system embodiments described above are only illustrative, and part or all of the modules can be selected to achieve the purpose of the embodiment scheme according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0108] The above is only the preferred specific embodiment of the application, but the protection scope of the application is not limited to this. Any changes or replacements within the technical range disclosed by the application can be easily thought of by those skilled in the art, and should be covered within the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A switching power supply circuit, characterized in that, Includes a power chip mounting area, an identification module, a switch switching module, and at least two voltage conversion modules; The power chip mounting area is coupled to the identification module, the identification module is connected to the switch switching module, and the voltage detection pin of the power chip mounting area is connected to each of the voltage conversion modules through the switch switching module; The power chip mounting area is used to connect a chip to be identified, and the chip to be identified is one of at least two types of power chips. The identification module is used to send different signals to the switch switching module when different power chips are connected to the power chip mounting area; The switch switching module is used to connect the voltage detection pin of the power chip mounting area to the voltage conversion module corresponding to the signal sent by the identification module according to the signal sent by the identification module. The voltage conversion module is used to convert the input voltage into a voltage suitable for the voltage detection pin of the chip to be identified.

2. The switching power supply circuit as described in claim 1, characterized in that, The switching power supply circuit also includes a transformer and a voltage regulator output module; The power chip mounting area is connected to the primary winding and auxiliary winding of the transformer; The secondary winding of the transformer is connected to the input terminal of the voltage regulator output module; The output terminal of the voltage regulator module is connected to the input terminal of the identification module; The output of the identification module is connected to the switch switching module.

3. The switching power supply circuit as described in claim 2, characterized in that, The identification module includes a voltage comparator; The first input terminal of the voltage comparator is connected to the output terminal of the voltage regulator module; The second input terminal of the voltage comparator is connected to the voltage detection pin of the power chip mounting area; The output of the voltage comparator is connected to the switch module.

4. The switching power supply circuit as described in claim 2, characterized in that, The voltage regulator output module includes a DC-DC chip.

5. The switching power supply circuit as described in claim 1, characterized in that, The voltage conversion module includes a first voltage conversion module and a second voltage conversion module; The switch switching module includes a first switch and a second switch; The voltage detection pin in the power chip mounting area is connected to the first voltage conversion module via a first switch. The voltage detection pin in the power chip mounting area is connected to the second voltage conversion module via a second switch. When a first type of power chip is connected to the power chip mounting area, the first switch is turned on. When a second power chip is connected to the power chip mounting area, the second switch is turned on.

6. The switching power supply circuit as described in claim 5, characterized in that, The first switch and the second switch are coupled so that the states of the first switch and the second switch are reversed.

7. The switching power supply circuit as described in claim 5, characterized in that, The first switch is a normally closed relay, and the second switch is a normally open relay.

8. The switching power supply circuit as described in claim 1, characterized in that, The different voltage conversion modules include resistor modules with different resistance values.

9. The switching power supply circuit as described in claim 1, characterized in that, The switching power supply circuit also includes a first resistor module; The voltage conversion module includes a second resistor module and a third resistor module; The input power of the power chip mounting area is connected to the first end of the first resistor module, and the second end of the first resistor module is connected to the first end of the switch module and the voltage detection pin of the power chip mounting area. The second terminal of the switch switching module is grounded through the second resistor module; The third terminal of the switch switching module is grounded through the third resistor module; The switch switching module is used to connect the voltage detection pin of the power chip mounting area to one of the second resistor module and the third resistor module according to the signal sent by the identification module.

10. An air conditioner, characterized in that, The air conditioner includes the switching power supply circuit according to any one of claims 1 to 9.

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