CN217741335U

CN217741335U - Charging control circuit, power supply circuit and electric equipment

Info

Publication number: CN217741335U
Application number: CN202220980807.6U
Authority: CN
Inventors: 余锦奎; 王慧磊; 郑嘉良
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2022-04-26
Filing date: 2022-04-26
Publication date: 2022-11-04
Anticipated expiration: 2032-04-26

Abstract

The utility model discloses a charge control circuit, power supply circuit and consumer. Wherein, this supply circuit includes power factor boost circuit, switch tube and relay, and above-mentioned switch tube connects the relay, and the relay inserts power factor boost circuit, and this charge control circuit includes: the first end of the voltage division sampling module is connected with the positive terminal of a direct current bus in the power factor booster circuit, the second end of the voltage division sampling module is connected with the ground wire, and the third end of the voltage division sampling module is connected with the control end of the switch tube; the voltage divider is used for dividing the voltage at the positive terminal of the direct current bus and then outputting a control voltage; the switching tube controls the on-off state of the switching tube according to the control voltage; the relay changes the suction state of the relay according to the on-off state of the switch tube, so that the power factor booster circuit is controlled to continue charging or stop charging. Through the utility model discloses, can realize stopping to charge through hardware control power factor boost circuit, avoid occupying the pin of chip, alleviate the burden of consumer chip.

Description

Charging control circuit, power supply circuit and electric equipment

Technical Field

The utility model relates to an electronic circuit technical field particularly, relates to a charge control circuit, power supply circuit and consumer.

Background

The integrated control of the IC chip is one of the means of digital control, and has been increasingly used in various driving circuits, and it is a simple and effective way in circuit design to implement control to the circuit by using the IC chip, but along with the development of technology and the demand of social production, the control of the circuit tends to be complex, and the demand for the number of chip ports increases every time a control function is added, and because the number of chip pins is always limited, more pins cannot be added to implement the functions of more diversification and complication of the circuit.

Taking charge control in a power supply circuit of an electric device (such as an air conditioner) as an example, in the existing scheme, on-off of a switch tube in the power supply circuit is controlled through a chip, and then power-on pull-in or power-off release of a relay is controlled, so that whether a power factor booster circuit continues or stops charging is controlled, therefore, a pin of the chip needs to be occupied, and control burden of the chip is increased.

Aiming at the problem that the control burden of a chip is increased when the chip is adopted to control the power on and off of a relay in a power supply circuit in the prior art, an effective solution is not provided at present.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an in provide a charge control circuit, supply circuit and consumer to when solving the break-make electricity that adopts the chip to control the relay among the supply circuit among the prior art, increase the problem of the control burden of chip.

For solving the technical problem, the utility model provides a charge control circuit is applied to consumer's supply circuit, wherein, supply circuit includes power factor boost circuit, switch tube and relay, the switch union coupling the relay, the relay inserts power factor boost circuit, charge control circuit includes:

a first end of the voltage division sampling module is connected with a positive electrode terminal of a direct current bus in the power factor booster circuit, a second end of the voltage division sampling module is connected with a ground wire, and a third end of the voltage division sampling module is connected with a control end of the switch tube; the voltage division sampling module is used for dividing the voltage at the positive terminal of the direct current bus and then outputting a control voltage;

the switching tube controls the on-off state of the switching tube according to the control voltage;

and the relay changes the suction state of the relay according to the on-off state of the switch tube, so that the power factor booster circuit is controlled to continue charging or stop charging.

Further, the partial pressure sampling module includes:

the first end of the first voltage division unit is connected with the positive terminal of a direct current bus in the power factor booster circuit, the second voltage division unit is connected with a grounding wire, and a line between the first voltage division unit and the second voltage division unit is connected with the control end of the switch tube.

Further, the first voltage division unit comprises at least two fixed-value resistors which are arranged in series.

Further, the second voltage dividing unit includes at least one constant value resistor, the total resistance of the second voltage dividing unit is smaller than the total resistance of the first voltage dividing unit, and the total resistance of the first voltage dividing unit and the total resistance of the second voltage dividing unit satisfy the following relationship:

further, the partial pressure sampling module further includes:

the first end of the filter resistor is connected between the first voltage division unit and the second voltage division unit, and the second end of the filter resistor is connected with the control end of the switch tube;

the first end of the filter capacitor is connected with the first end of the filter resistor, and the second end of the filter capacitor is connected between the second voltage division unit and the ground wire;

and the filter resistor and the filter capacitor act together to filter the voltage between the first voltage division unit and the second voltage division unit.

Further, the resistance value of the filter resistor is smaller than the total resistance value of the first voltage division unit, and the total resistance value of the first voltage division unit and the resistance value of the filter resistor satisfy the following relationship:

further, the partial pressure sampling module is specifically configured to:

when the voltage of the positive terminal of the direct current bus is smaller than a preset threshold value, outputting a first control voltage to control the switching tube to be turned off, and further control the relay to be released in a power-off mode, so that the power factor booster circuit is controlled to be charged continuously;

and when the voltage of the positive terminal of the direct current bus is greater than or equal to the preset threshold value, outputting a second control voltage to control the switch tube to be conducted, and further control the relay to be electrified and pulled in, so that the power factor booster circuit is controlled to stop charging.

The utility model also provides a power supply circuit, including power factor boost circuit, switch tube and relay, still include above-mentioned charge control circuit.

The utility model also provides an electric equipment, including above-mentioned supply circuit.

Further, the electric equipment is an air conditioner.

Use the technical scheme of the utility model, gather the voltage of the positive terminal department of the direct current generating line among the power factor boost circuit through partial pressure sampling module, export the control end of the switch tube among the power supply circuit after the voltage partial pressure of the positive terminal department of direct current generating line, after power factor boost circuit charges and accomplishes, the switch tube among the control power supply circuit is turn-offed, and then the control relay outage, final control power factor boost circuit stops to charge, realized stopping to charge through hardware control power factor boost circuit, avoid occupying the pin of chip, alleviate the burden of consumer chip.

Drawings

FIG. 1 is a control schematic of a prior art charge control scheme;

fig. 2 is a connection relationship diagram of a charge control circuit and a power factor boost according to an embodiment of the present invention;

fig. 3 is a structural diagram of a voltage division sampling module of a charge control circuit according to the present invention.

Detailed Description

To make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings, and it is to be understood that the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the embodiments of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter associated objects are in an "or" relationship.

It should be understood that although the terms first, second, etc. may be used to describe fixed resistors in embodiments of the present invention, these fixed resistors should not be limited by these terms. These terms are only used to distinguish between resistance values of different types. For example, a fixed resistor may also be referred to as a fixed resistor, and similarly, a fixed resistor may also be referred to as a fixed resistor without departing from the scope of embodiments of the present invention.

The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.

It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of another identical element in a good or device that comprises the element.

The following describes in detail alternative embodiments of the present invention with reference to the accompanying drawings.

Example 1

The embodiment provides a charging control circuit, which is applied to a power supply circuit of an electric device, the power supply circuit includes a power factor boost circuit (PFC boost circuit), a switching tube and a relay, fig. 1 is a control schematic diagram of a conventional charging control scheme, as shown in fig. 1, the switching tube Q is connected to a relay K, the relay K is connected to a first terminal AC-L1 and a second terminal AC-N1 of the power factor boost circuit, in the prior art, the switching tube Q is controlled by a chip to be turned on and off, so as to control the relay K to be powered on, attracted, or powered off and released, and finally control the power factor boost circuit to continue to charge or stop charging, when the power factor charging capacitor is saturated during specific implementation, the bus voltage detected by the chip reaches a certain value or more, the control voltage SIGNAL is generated based on the voltage, the control voltage SIGNAL is sent to a control end of a switch tube connected with the relay through a control SIGNAL terminal SIGNAL, the control end (base) of the switch tube Q is output after voltage division through resistors R01 and R02, the switch tube Q is conducted, a coil inside the relay K is conducted, a +12V voltage provided by a power supply forms a closed loop through a first end 1 and a second end 2 of the coil inside the relay and then to GND _ DRIVE, an armature of the relay K is attracted, a contact 3 and a contact 4 are conducted, a soft start branch of a live wire current path PTC resistor R03 is short-circuited, the power factor booster circuit is charged completely, and C01 in the circuit is used for controlling voltages at two ends of the resistor R01.

In the above scheme, the on-off of the switch tube in the power supply circuit is controlled by the chip, and then the power-on suction or power-off release of the relay is controlled, so that whether the power factor booster circuit continues or stops charging is controlled, therefore, one pin of the chip needs to be occupied, and the control burden of the chip is increased.

In order to solve the above problem, this embodiment provides a charge control circuit, fig. 2 is a connection diagram of the charge control circuit and the power factor voltage boosting according to the embodiment of the present invention, as shown in fig. 2, this charge control circuit includes:

a first end of the voltage division sampling module 10 is connected with a positive terminal P of a direct current bus in the power factor booster circuit, a second end of the voltage division sampling module is connected with a ground wire, and a third end of the voltage division sampling module is connected with a control end of the switching tube Q; the voltage division sampling module 10 is used for dividing the voltage at the positive terminal P of the dc bus, and then outputting a control voltage to control the on/off of the switching tube Q, and further control the relay K to change the pull-in state of the relay K, thereby controlling the power factor boost circuit to continue charging or stop charging.

In specific implementation, if the power factor boost circuit is not charged completely, and the voltage of the positive terminal of the direct current bus is smaller than a preset threshold, the voltage division sampling module 10 outputs a first control voltage smaller than the conduction voltage of the switching tube Q, so that the switching tube Q is kept turned off, and the relay K is controlled to be powered off and released, so that the conduction of the soft start branch of the live wire current path PTC resistor R03 is controlled, and the power factor boost circuit is controlled to be charged continuously; if the charging of the power factor booster circuit is completed, the voltage of the positive terminal of the direct current bus is greater than or equal to the preset threshold, the partial pressure sampling module 10 outputs a second control voltage which is greater than the conduction voltage of the switching tube Q, the switching tube Q is controlled to be conducted, and then the relay K is controlled to be attracted, so that the short circuit of the soft start branch of the live wire current path PTC resistor R03 is controlled, and the power factor booster circuit stops charging.

The charge control circuit of this embodiment, gather the voltage of the positive terminal P department of the direct current generating line among the power factor boost circuit through partial pressure sampling module 10, output the control end of the switch tube among the power supply circuit after the voltage partial pressure of the positive terminal P department of direct current generating line, after power factor boost circuit charges and accomplishes, the switch tube among the control power supply circuit is turn-offed, and then control relay K outage, final control power factor boost circuit stops to charge, realized stopping to charge through hardware control power factor boost circuit, avoid occupying the pin of chip, alleviate the burden of consumer chip. Through hardware control, the time delay of relay actuation control can also be avoided, and the control efficiency is improved.

Example 2

This embodiment provides another kind of charge control circuit, and fig. 3 is according to the utility model discloses charge control circuit's partial pressure sampling module's structure chart, as shown in fig. 3, because the voltage of the positive terminal P department of direct current generating line is great, and the voltage that switch tube Q can bear is less, consequently, need with the voltage partial pressure of the positive terminal P department of direct current generating line, obtain less voltage, above-mentioned partial pressure sampling module 10 includes: the first voltage division unit 101 and the second voltage division unit 102 are arranged in series, a first end of the first voltage division unit 102 is connected with a positive terminal P of a direct current bus in the power factor booster circuit, the second voltage division unit 102 is connected with a ground wire, and a line between the first voltage division unit 101 and the second voltage division unit 102 is connected with a control end of the switch tube Q in fig. 1 and used for transmitting a control voltage signal obtained by voltage division to the switch tube Q so as to control the on-off of the switch tube Q.

If a single voltage dividing unit is adopted as the first voltage dividing unit 101, the voltage between the single resistors is very large, which easily causes the resistors to be burned out, and therefore, the first voltage dividing unit 101 includes at least two fixed resistors connected in series, and in this embodiment, the number of the fixed resistors is 3, which are the first resistor R1, the second resistor R2, and the third resistor R3 respectively.

Passes through a first voltage division unit 101, the voltage has been greatly reduced, the second voltage dividing unit 102 can at least include a fixed value resistor RS1, if including a plurality of fixed value resistors, each fixed value resistor can be connected in series, in parallel or in series-parallel, the total resistance of the second voltage dividing unit 102 is less than the total resistance of the first voltage dividing unit, and the total resistance of the first voltage dividing unit 101 and the total resistance of the second voltage dividing unit 102 satisfy the following relationship:

specifically, in order to ensure that the divided voltage is within the operating voltage range of the switching tube, the first threshold value is 50, and the second threshold value may be set to 60.

In order to prevent noise from being doped in the waveform of the voltage output by the voltage dividing unit 101, the voltage dividing and sampling module 10 further includes: a filter resistor R0, a first end of which is connected between the first voltage dividing unit 101 and the second voltage dividing unit 102, and a second end of which is connected to the control end of the switching tube Q; a first end of the filter capacitor C0 is connected to the first end of the filter resistor R0, and a second end thereof is connected between the second voltage division unit 102 and the ground line; the filter resistor R0 and the filter capacitor C0 form an RC filter circuit, which filters the voltage between the first voltage dividing unit 101 and the second voltage dividing unit 102, and outputs the filtered voltage to the control end of the switching tube Q.

In order to avoid the voltage output by the voltage division sampling module 10 from being affected by the excessive voltage drop generated at the two ends of the filter resistor R0, the resistance of the filter resistor R0 is smaller than the total resistance of the first voltage division unit 101, and the total resistance of the first voltage division unit 101 and the resistance of the filter resistor R0 satisfy the following relationship:

to ensure that the value of the filter resistor R0 is much smaller than the total value of the first voltage dividing unit 101, the third threshold may be set to 1000, 2000, 5000, etc.

In order to accurately control the on/off of the switching tube and further control the charging of the power factor boost circuit, the voltage division sampling module 10 is specifically configured to: when the voltage of the positive terminal of the direct current bus is smaller than a preset threshold value, outputting a first control voltage, controlling the switching tube Q to be turned off, and further controlling the relay K to be powered off and released, so that the power factor booster circuit is controlled to continue to be charged; when the voltage of the positive terminal of the direct current bus is larger than or equal to the preset threshold value, a second control voltage is output, the switch tube Q is controlled to be conducted, and then the relay K is controlled to be electrified and pulled in, so that the power factor booster circuit is controlled to stop charging. The preset threshold is a voltage which should be reached by the positive terminal P of the dc bus when the charging of the boost circuit is completed.

In specific implementation, the first resistor R1, the second resistor R2, and the third resistor R3 adopt fixed value resistors with large resistance values to divide the voltage at the positive terminal P of the dc bus, the fixed value resistor RS1 adopts a small resistance value, the bus voltage is reduced to the voltage difference at two ends of the RS1 in proportion between 1/60 and 1/50 of the sum of the first resistor R1, the second resistor R2, and the third resistor R3, and after filtering by the filter resistor R0 and the filter capacitor C0, the voltage range in which the switching tube Q operates is initially satisfied, the first resistor R1, the second resistor R2, and the third resistor R3 adopt fixed value resistors with k Ω level, and the filter resistor R0 adopts resistors with Ω level, so as to avoid large voltage difference at two ends of the R0 used for filtering.

The control voltage of the switch tube of the embodiment is directly introduced from the bus voltage, the high voltage is considered to act on the resistor to easily generate heat dissipation, and the protection of the circuit is lacked, so that the selection of the corresponding resistance value of the resistor is carried out according to the condition of the actual circuit according to the voltage division principle and the resistor sampling mode, and the working range of the switch tube Q is met by the resistor RS1 with the same value.

Referring to fig. 1 mentioned above, components in the circuit of fig. 1 are kept unchanged, the control voltage output by the voltage division sampling module 10 replaces the control voltage output by the chip originally, the control voltage is divided by R01 and R02 and then output to the switching tube Q, and when the voltage at the two ends of R01 reaches the conduction voltage drop of the switching tube Q, the switching tube Q can be controlled to be conducted by a hardware control mode, so that the relay is controlled to pull in, and the effect of stopping charging of the power function booster circuit is controlled.

In this embodiment, the number and the resistance of the fixed-value resistors in the first voltage dividing unit need to be designed according to the parameters of the switching tube and the bus voltage value in practical application.

Example 3

The embodiment provides a power supply circuit, which comprises a power factor boost circuit, a switch tube, a relay and a charging control circuit in the above embodiment.

As shown in fig. 2 mentioned hereinabove, the power factor boost circuit of the present embodiment includes: the ignition terminal AL _ L is connected to the first terminal AC-L1 in fig. 1 mentioned above, the neutral terminal AL _ N1 is connected to the second terminal AC-N1, the input current is sent to the rectifier bridge G101 through the ignition terminal AL _ L1 and the neutral terminal AL _ N1 for rectification, the fourth resistor R4 bridged across the rectifier bridge G101 plays a role of preventing surge, the first capacitor C1 plays a role of filtering, the inductor L1 and the single-phase diode D1 serve as core elements of the power factor boost circuit for realizing the boost function, the inductor L1 plays a role of storing energy, the second capacitor C2, the third capacitor C3 and the fifth resistor R5 to the twelfth resistor R12 of the RC absorption loop are used for absorbing energy generated by the inductor L1 due to the current non-abrupt change characteristic, the energy is consumed in the form of resistance heat release, the power switch Z1 functioning as a switch is prevented from being damaged due to excessive current, the clamp ZD1 is used for protecting the power switch Z1, the IGBT is used for preventing the power switch Z1 from being erroneously discharged by other current driving signals, and the IGBT driving signal is used for controlling the gate electrode 13. The fourth capacitor C4 is an energy storage capacitor, and after the voltage is boosted, the load electricity of the electric equipment is taken from two ends of the capacitor; the current flowing through a loop of the power factor booster circuit is collected at two ends of a sampling resistor RS2 respectively and is input to two input ends of an operator U9-A through a fourteenth resistor R14 and a fifteenth resistor R15 respectively, one end of a connection point between the fourteenth resistor R14 and one input end of the operator U9-A is grounded through a one-way diode D2, the other end of the connection point is connected with a 3.3V voltage source through a sixteenth resistor R16, the output end of the operator U9-A is connected with one input end of the operator U9-A through a seventeenth resistor R17, the operator U9-A outputs a signal PFC _ C1 and a signal PFC _ C after performing in-phase summation operation on two paths of current signals, the voltage value of the signal PFC _ C1 is compared with a current protection set value of the power factor booster circuit, when the current protection set value is exceeded, the input of the power factor booster circuit is disconnected for overcurrent protection, the signal PFC _ C is input into a chip for corresponding calculation, and the chip performs RC filtering through an eighteenth resistor R18 and a fifth capacitor C5 of a preceding stage circuit to obtain a direct current signal.

Example 4

The embodiment provides an electric device, which includes the power supply circuit in the above embodiment, and is configured to control the power factor boost circuit to stop charging through hardware, so as to avoid occupying pins of a chip and reduce a burden on the chip of the electric device. In an optional embodiment of the present invention, the electric device is an air conditioner.

The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on 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.

Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. The utility model provides a control circuit charges, is applied to consumer's supply circuit, wherein, supply circuit includes power factor boost circuit, switch tube and relay, the switch tube is connected the relay, the relay inserts power factor boost circuit, its characterized in that, the control circuit that charges includes:

a first end of the voltage division sampling module is connected with a positive electrode terminal of a direct current bus in the power factor booster circuit, a second end of the voltage division sampling module is connected with a ground wire, and a third end of the voltage division sampling module is connected with a control end of the switch tube; the voltage divider is used for dividing the voltage at the positive terminal of the direct current bus and then outputting a control voltage;

2. The charge control circuit of claim 1, wherein the voltage division sampling module comprises:

3. The charge control circuit of claim 2, wherein the first voltage dividing unit comprises at least two fixed-value resistors arranged in series.

4. The charge control circuit of claim 2,

the second voltage division unit comprises at least one constant value resistor, the total resistance value of the second voltage division unit is smaller than that of the first voltage division unit, and the total resistance value of the first voltage division unit and the total resistance value of the second voltage division unit meet the following relation:

5. the charge control circuit of claim 2, wherein the voltage division sampling module further comprises:

the filter resistor and the filter capacitor act together to filter the voltage between the first voltage division unit and the second voltage division unit.

6. The charge control circuit of claim 5,

the resistance value of the filter resistor is smaller than the total resistance value of the first voltage division unit, and the total resistance value of the first voltage division unit and the resistance value of the filter resistor meet the following relation:

7. the charge control circuit of claim 1, wherein the voltage division sampling module is specifically configured to:

8. A power supply circuit comprising a power factor boost circuit, a switch tube and a relay, characterized by further comprising a charge control circuit according to any one of claims 1 to 7.

9. An electric consumer, characterized in that it comprises a supply circuit as claimed in claim 8.

10. The electrical device of claim 9, wherein the electrical device is an air conditioner.