CN110581650A - power control circuit and electrical equipment - Google Patents
power control circuit and electrical equipment Download PDFInfo
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- CN110581650A CN110581650A CN201910963037.7A CN201910963037A CN110581650A CN 110581650 A CN110581650 A CN 110581650A CN 201910963037 A CN201910963037 A CN 201910963037A CN 110581650 A CN110581650 A CN 110581650A
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- 238000001514 detection method Methods 0.000 claims abstract description 30
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 8
- 239000003990 capacitor Substances 0.000 claims description 71
- 238000005070 sampling Methods 0.000 claims description 38
- 230000006698 induction Effects 0.000 claims description 6
- 230000006641 stabilisation Effects 0.000 claims description 6
- 238000011105 stabilization Methods 0.000 claims description 6
- 238000004804 winding Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
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- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0032—Control circuits allowing low power mode operation, e.g. in standby mode
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- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
a power control circuit comprising: the device comprises a transformer, a switching power supply module, a current detection module, a voltage stabilizing module and a pulse current generator; the transformer comprises a primary coil, a secondary coil and an auxiliary coil, wherein the primary coil is connected with a power supply, and the secondary coil is connected with a load; the current detection module is respectively connected with the load and the pulse current generator; the pulse current generator is connected with the secondary coil, and the switching power supply module is respectively connected with the primary coil and the auxiliary coil. By detecting the load current, the working frequency of the switch power supply module is controlled, namely the on-off frequency of a built-in switch of the switch power supply module is controlled, so that the output voltage of a secondary coil of the transformer is controlled, and the switch power supply module is in a low-frequency working mode when the load is in a standby state, namely light load, so that the low power consumption of the switch power supply module is realized, and the energy is saved; and when the load is in a working state, namely a heavy load, the switching power supply module is in a high-frequency working mode, so that the normal operation of the load is guaranteed.
Description
Technical Field
the invention relates to the technical field of household appliances, in particular to a power supply control circuit and electrical equipment.
background
with the development of science and technology and the continuous improvement of the living standard of people, the household appliance industry is developing towards the directions of environmental protection, energy conservation, safety and low price. Many household appliances in common use today are for example: when household appliances such as a steaming and baking dual-energy machine, an air conditioner and the like are in a standby state, partial circuits or devices in the household appliances still need to be supplied with power by a power supply, so that the power consumption of the household appliances is high in the standby state, and further the energy waste is caused.
disclosure of Invention
therefore, the technical problem to be solved by the present invention is to overcome the defects of high power consumption and energy waste of the electrical equipment in the standby process in the prior art, so as to provide a power control circuit, which includes: the device comprises a transformer, a switching power supply module, a current detection module, a voltage stabilizing module and a pulse current generator;
the transformer includes: the switching power supply comprises a primary coil, a secondary coil and an auxiliary coil, wherein one end of the primary coil is connected with a power supply, the other end of the primary coil is connected with a first port of the switching power supply module, and the secondary coil is connected with a load;
The input end of the current detection module is connected with one end of the load, and the output end of the current detection module is connected with the input end of the pulse current generator, and the current detection module is used for detecting a current signal of the load and sending the current signal to the pulse current generator;
the output end of the pulse current generator is connected with the secondary coil and outputs a pulse signal according to the current signal of the current detection module;
The control port of the switching power supply module is connected with the auxiliary coil through the voltage stabilizing module and used for receiving a voltage signal output by the auxiliary coil and controlling the on/off of a built-in switch in the switching power supply module according to the voltage signal;
and the detection port of the switching power supply module is connected with the auxiliary coil, receives the induction pulse signal of the pulse signal in the auxiliary coil, and controls the working frequency of the switching power supply module according to the induction pulse signal.
further, the voltage stabilization module includes: a first resistor and a second resistor;
one end of the first resistor is connected with the auxiliary coil, and the other end of the first resistor is connected with one end of the second resistor;
the other end of the second resistor is grounded;
The control port is connected with the connecting end of the first resistor and the second resistor.
further, the voltage stabilization module further includes: a rectifier diode;
the first resistor is connected with the auxiliary coil through the rectifier diode.
further, the current detection module includes: the device comprises a current sampling unit, a reference voltage unit and a comparison unit;
The input end of the current sampling unit is connected with one end of the load, the output end of the current sampling unit is connected with the first input end of the comparison unit,
The output end of the reference voltage unit is connected with the second input end of the comparison unit;
the output end of the comparison unit is connected with the input end of the pulse current generator.
Further, the current sampling circuit includes: the operational amplifier comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor and an operational amplifier;
One end of the third resistor is connected with the input end of the current sampling circuit, the other end of the third resistor is respectively connected with one end of the fourth resistor and one end of the fifth resistor, the other end of the fourth resistor is grounded, the other end of the fifth resistor is respectively connected with one end of the sixth resistor and the positive input end of the operational amplifier, the other end of the sixth resistor is externally connected with a level signal, the negative input end of the operational amplifier is respectively connected with one end of the seventh resistor and one end of the eighth resistor, the other end of the seventh resistor is grounded, and the output end of the operational amplifier is respectively connected with the other end of the eighth resistor and the output end of the current sampling circuit.
Further, the current sampling circuit further includes: a ninth resistor, a tenth resistor, an eleventh resistor, a first capacitor, a second capacitor and a third capacitor;
The ninth resistor is connected with the fourth resistor in parallel, one end of the tenth resistor is connected with the output end of the operational amplifier, the other end of the tenth resistor is grounded, the output end of the operational amplifier is connected with the output end of the current sampling unit through the eleventh resistor, the first capacitor is connected with the eighth resistor in parallel, one end of the second capacitor is connected with the output end of the current sampling unit, the other end of the second capacitor is grounded, one end of the third capacitor is connected with the positive input end of the operational amplifier, and the other end of the third capacitor is grounded.
Further, the reference voltage unit includes: a twelfth resistor, a thirteenth resistor, a fourteenth resistor and a first voltage stabilizing subunit;
One end of the twelfth resistor is externally connected with a level signal, the other end of the twelfth resistor is respectively connected with one end of the thirteenth resistor, the first end of the first voltage-stabilizing subunit and the second input end of the comparison unit, the second end of the first voltage-stabilizing subunit is respectively connected with the other end of the thirteenth resistor and one end of the fourteenth resistor, and the third end of the first voltage-stabilizing subunit and the other end of the fourteenth resistor are grounded.
further, the first voltage-stabilizing subunit is a TL431 chip.
further, the comparison unit includes: a comparator for comparing the voltage of the output signal with a reference voltage,
the first input end of the comparator is connected with the output end of the current sampling circuit, the second input end of the comparator is connected with the output end of the reference voltage unit, and the output end of the comparator is connected with the input end of the pulse current generator.
Further, the comparing unit further includes: a fifteenth resistor, a sixteenth resistor, a fourth capacitor, a fifth capacitor and a sixth capacitor;
one end of the fifteenth resistor is connected with the first input end of the comparison unit, the other end of the fifteenth resistor is connected with the first input end of the comparator, one end of the sixteenth resistor is connected with the output end of the comparator, the other end of the sixteenth resistor is connected with the output end of the comparison unit, one end of the fourth capacitor is connected with the second input end of the comparator, the other end of the fourth capacitor is grounded, one end of the fifth capacitor is connected with the first input end of the comparator, the other end of the fifth capacitor is grounded, one end of the sixth capacitor is respectively connected with the output end of the comparator and one end of the sixteenth capacitor, and the other end of the sixth capacitor is grounded.
further, the switching power supply module further includes:
And the voltage detection port is connected with the primary coil of the transformer and is used for detecting a voltage signal of the switching power supply module and performing voltage protection on the switching power supply module according to the voltage signal.
Further, the power control circuit further includes:
and one end of the freewheeling diode is connected with one end of the secondary coil of the transformer, and the other end of the freewheeling diode is connected with the corresponding end of the load.
Further, the power control circuit further includes:
The two ends of the seventh capacitor are respectively connected with the two ends of the power supply; and/or
And one end of the eighth capacitor is connected with one end of the load, and the other end of the eighth capacitor is grounded.
Correspondingly, the present invention further provides an electrical apparatus, including the above power control circuit, further including: a power supply and an electrical equipment main body;
The power supply supplies power to the electrical equipment main body through the power supply control circuit.
the technical scheme of the invention has the following advantages:
According to the power supply control circuit and the electrical equipment, the working frequency of the switch power supply module is controlled through detecting the load current, namely the on-off frequency of the built-in switch of the switch power supply module is controlled, so that the output voltage of the secondary coil of the transformer is controlled, and the switch power supply module is in a low-frequency working mode when the load is in a standby state, namely light load, so that the low-power-consumption standby of the switch power supply module is realized, and the energy is saved; and when the load is in a working state, namely a heavy load, the switching power supply module is in a high-frequency working mode, so that the normal operation of the load is guaranteed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a power control circuit according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a current detection module according to an embodiment of the present invention;
FIG. 3 is a waveform diagram of a pulse signal according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electrical apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
in the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
A first aspect of the embodiments of the present invention provides a power control circuit 2, please refer to fig. 1, which includes: a power control circuit 2 comprises a transformer T, a switching power supply module U1, a current detection module U3, a voltage stabilization module U4 and a pulse current generator U2. The transformer T includes: the primary coil is connected with a power supply AC at one end, connected with the first port D of the switching power supply module U1 at the other end, and connected with a load RL. The input end of the current detection module U3 is connected to one end of the load RL, and the output end thereof is connected to the input end of the pulse current generator U2, and is used for detecting a current signal of the load RL and sending the current signal to the pulse current generator U2. The output end of the pulse current generator U2 is connected with the secondary coil, and outputs a pulse signal according to the current signal of the current detection module U3. The control port VS of the switching power supply module U1 is connected to the auxiliary coil through the voltage stabilizing module U4, and is configured to receive a voltage signal output by the auxiliary coil and control the on/off of a switch built in the switching power supply module U1 according to the voltage signal. And a detection port CS of the switching power supply module U1 is connected with the auxiliary coil, receives an induction pulse signal of the pulse signal in the auxiliary coil, and controls the working frequency of the switching power supply module U1 according to the induction pulse signal.
The switching power supply module U1 has a built-in switch. Specifically, the built-in switch may be an MOS transistor, and the switching power supply module U1 controls the output voltage of the secondary coil of the transformer by controlling the turn-off or turn-on of the MOS transistor. According to the electromagnetic induction principle, when the MOS tube is conducted, the primary coil of the transformer T stores energy; when the MOS is turned off, the energy stored in the primary winding of the transformer T is transferred to the secondary winding.
As shown in fig. 1, the first port D of the switching power supply module U1 is connected to the drain port of the MOS transistor, that is, the drain port of the MOS transistor is connected to the primary winding of the transformer T through the first port D of the switching power supply module U1. The switching power supply module U1 is also provided with a ground port S. A control port VS of the switching power supply module U1 is connected with a grid electrode of the MOS tube, namely the grid electrode of the MOS tube is connected with a secondary coil of the transformer T through the control port VS of the switching power supply module U1, a voltage signal fed back by the secondary coil is received, the voltage is compared with a reference voltage in the switching power supply module U1, the MOS tube is controlled to be switched on or switched off according to a comparison result, when the feedback voltage is greater than the reference voltage, the MOS tube is switched on, and a primary coil of the transformer T is charged; when the feedback voltage is smaller than the reference voltage, the MOS tube is turned off, the energy charged by the primary coil is flyback to the secondary coil, and the voltage is output to the load RL. The detection port CS of the switching power supply module U1 is connected to the auxiliary coil, and receives a voltage signal induced in the auxiliary coil by the pulse signal output by the pulse current generator U2. When the detection port CS of the switching power supply module U1 detects a pulse signal, it is determined that the load RL is in a heavy load state, and the switching power supply module U1 needs to be awakened to enter a high-frequency operating mode, that is, the on-off frequency of an MOS transistor built in the switching power supply module U1 is increased, so as to meet the requirement of the load RL. When the detection port CS of the switching power supply module U1 does not detect the pulse signal, it is determined that the load RL is in a light load state, and the switching power supply module U1 is controlled to enter a low frequency operating mode, so as to reduce the standby power consumption of the switching power supply module U1.
Optionally, if the switching power supply module U1 does not detect the pulse signal within the preset time, the switching power supply module U1 may be controlled to enter the low frequency operating mode.
In one implementation of the embodiment of the present invention, as shown in fig. 1, the voltage stabilization module U4 includes: a first resistor R1 and a second resistor R2. One end of the first resistor R1 is connected to the auxiliary coil, and the other end thereof is connected to the second resistor R2. The other end of the second resistor R2 is connected to ground. The control port VS is connected to the connection of the first resistor R1 and the second resistor R2. The voltage stabilizing module U4 is used to regulate the output voltage Vout of the secondary winding of the transformer T, and the calculation formula of Vout is as follows:
Vout＝(1+R1/R2)*VK/NAS，
Wherein, VKIs a reference voltage, N, inside the switching power supply module U1ASThe number of turns of the auxiliary coil and the secondary coil of the transformer TAnd (4) the ratio.
Optionally, as shown in fig. 1, the voltage regulation module U4 further includes: and a rectifier diode D1. The first resistor R1 is connected to the auxiliary winding of the transformer T via a rectifier diode D1.
In one implementation of the embodiment of the present invention, as shown in fig. 2, the current detection module U3 includes: a current sampling unit U31, a reference voltage unit U32, and a comparison unit U33. The input terminal of the current sampling unit U31 is connected to one terminal of the load RL, and the output terminal thereof is connected to the first input terminal of the comparing unit U33. An output terminal of the reference voltage unit U32 is connected to a second input terminal of the comparison unit U33. An output of the comparing unit U33 is connected to an input of the pulse current generator U2.
Optionally, as shown in fig. 2, the current sampling unit U31 includes: a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and an operational amplifier U6. One end of a third resistor R3 is connected with an input end of the current sampling circuit, the other end of the third resistor R3 is respectively connected with one end of a fourth resistor R4 and one end of a fifth resistor R5, the other end of the fourth resistor R4 is grounded, the other end of the fifth resistor R5 is respectively connected with one end of a sixth resistor R6 and a positive input end of an operational amplifier U6, the other end of the sixth resistor R6 is externally connected with a level signal, a negative input end of an operational amplifier U6 is respectively connected with one end of a seventh resistor R7 and one end of an eighth resistor R8, the other end of the seventh resistor R7 is grounded, and an output end of the operational amplifier U6 is respectively connected with the other end of the eighth resistor R8 and an output end of the current sampling circuit. Specifically, the input end + VIN of the current sampling unit U31 is connected to one end of the load RL, the node voltage VC is obtained after voltage division by the third resistor R3 and the fourth resistor R4, the sampling current is obtained after voltage division by the fifth resistor R5, and the sampling voltage Vcurrent is obtained after amplification by the operational amplifier U6, and the calculation formula of Vcurrent is as follows:
Vcurrent＝VCC*(R5/(R5+R6))*((R7+R8)/R8)+
VCC*(R6/(R5+R6))*((R7+R8)/R7)。
preferably, as shown in fig. 2, the current sampling circuit further includes: a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a first capacitor C1, a second capacitor C2 and a third capacitor C3. The ninth resistor R9 and the fourth resistor R4 are connected in parallel, one end of a tenth resistor R10 is connected with the output end of the operational amplifier U6, the other end of the tenth resistor R10 is grounded, the output end of the operational amplifier U6 is connected with the output end of the current sampling unit U31 through an eleventh resistor R11, the first capacitor C1 is connected with the eighth resistor R8 in parallel, one end of the second capacitor C2 is connected with the output end of the current sampling unit U31, the other end of the second capacitor C2 is grounded, one end of the third capacitor C3 is connected with the positive input end of the operational amplifier U6, and the other end of the third capacitor C3 is grounded.
alternatively, as shown in fig. 2, the reference voltage unit U32 includes: a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14 and a first voltage regulator subunit U5. One end of the twelfth resistor R12 is externally connected to a level signal, the other end of the twelfth resistor R12 is connected to one end of the thirteenth resistor R13, the first end of the first voltage-stabilizing subunit U5 and the second input end of the comparing unit U33, the second end of the first voltage-stabilizing subunit U5 is connected to the other end of the thirteenth resistor R13 and one end of the fourteenth resistor R14, and the third end of the first voltage-stabilizing subunit U5 and the other end of the fourteenth resistor R14 are grounded. In the present embodiment, the reference voltage unit U32 may generate a stable reference voltage VREF. The first voltage regulation subunit U5 may generate a reference voltage, and the thirteenth resistor R13 and the fourteenth resistor R14 are voltage dividing resistors for adjusting the reference voltage VREF generated by the reference voltage unit U32. The reference voltage VREF is input to the comparing unit U33 and is compared with the sampling voltage output by the current sampling unit U31 to determine whether the current load RL is a light load or a heavy load.
In practical applications, the reference voltage unit U32 may also directly input a fixed voltage signal as the reference voltage VREF from the outside, and the invention is not limited thereto.
Preferably, the first voltage regulation subunit U5 is a TL431 chip.
Optionally, as shown in fig. 2, the comparing unit U33 includes: comparator U7. The comparator U7 has a first input connected to the output of the current sampling circuit, a second input connected to the output of the reference voltage unit U32, and an output connected to the input of the pulse current generator U2. The comparator U7 determines whether the load RL is under light load or heavy load by comparing the sampling voltage output by the current sampling unit U31 with the reference voltage VREF generated by the reference voltage unit U32. If the sampling voltage is greater than VREF, the comparing unit U33 outputs a high level, i.e., Vout1 is VCC; when the sampling voltage is less than VREF, the comparing unit U33 outputs a low level, i.e., Vout1 is 0V.
specifically, when Vout1 is at a high level, i.e., the current in the load RL is greater than the set value I, a high level signal is input to the pulse current generator U2, so that the pulse current generator U2 outputs a pulse signal as shown in fig. 3.
Alternatively, the pulse current generator U2 may be a master IC, and Vout1 is connected to one of the I/O ports of the IC and sends out a square wave pulse signal as shown in fig. 3 when the I/O port detects an input high level.
Preferably, as shown in fig. 2, the comparing unit U33 further includes: a fifteenth resistor R15, a sixteenth resistor R16, a fourth capacitor C4, a fifth capacitor C5 and a sixth capacitor C6. One end of a fifteenth resistor R15 is connected to the first input terminal of the comparison unit U33, the other end of the fifteenth resistor R15 is connected to the first input terminal of the comparator U7, one end of a sixteenth resistor R16 is connected to the output terminal of the comparator U7, the other end of a sixteenth resistor R16 is connected to the output terminal of the comparison unit U33, one end of a fourth capacitor C4 is connected to the second input terminal of the comparator U7, the other end of the fourth capacitor C4 is grounded, one end of a fifth capacitor C5 is connected to the first input terminal of the comparator U7, the other end of the fifth capacitor C5 is grounded, one end of a sixth capacitor C6 is connected to the output terminal of the comparator U7 and one end of the sixteenth capacitor, and the other end of the sixth capacitor C6 is grounded. The fifteenth resistor R15 is a current limiting resistor, and plays a role in limiting current. The sixteenth resistor R16 and the sixth capacitor C6 form a filter circuit for filtering the interference of the voltage signal output by the comparing unit U33. The fourth capacitor C4 and the fifth capacitor C5 are filter capacitors.
in one implementation manner of the embodiment of the present invention, as shown in fig. 1, the switching power supply module U1 further includes: the voltage detection port HV. The voltage detection port HV is connected to the primary coil of the transformer T, and is configured to detect a voltage signal of the switching power supply module U1, and perform voltage protection on the switching power supply module U1 according to the voltage signal. The switch capacitor module has an overvoltage and undervoltage protection detection function, and when the switch power supply module U1 is detected to have overvoltage or undervoltage, the switch capacitor module can be intermittently reset until the voltage is normal, so that the switch power supply module U1 is protected.
optionally, as shown in fig. 1, the power control circuit 2 further includes: a freewheeling diode D2. The freewheeling diode D2 has one end connected to one end of the secondary winding of the transformer T and the other end connected to the corresponding end of the load RL. The freewheeling diode D2 is used to provide a continuous current to the load RL to prevent sudden changes in load RL current and to smooth the current.
Optionally, as shown in fig. 1, the power control circuit 2 further includes: a seventh capacitance C7 and/or an eighth capacitance C8. Two ends of the seventh capacitor C7 are connected to two ends of the power supply AC, respectively. One end of the eighth capacitor C8 is connected to one end of the load RL, and the other end is grounded. The seventh capacitor C7 and the eighth capacitor are both filter capacitors.
a second aspect of the embodiments of the present invention provides an electrical apparatus, with reference to fig. 4, including: the power supply control circuit 2 further includes: power supply AC, electrical equipment main body 1. The power supply AC supplies power to the electric appliance main body 1 through the power supply control circuit 2.
according to the power supply control circuit and the electrical equipment provided by the embodiment of the invention, the working frequency of the switch power supply module is controlled through detecting the load current, namely the on-off frequency of the built-in switch of the switch power supply module is controlled, so that the output voltage of the secondary coil of the transformer is controlled, and the switch power supply module is in a low-frequency working mode when the load is in a standby state, namely light load, so that the low-power-consumption standby of the switch power supply module is realized, and the energy is saved; and when the load is in a working state, namely a heavy load, the switching power supply module is in a high-frequency working mode, so that the normal operation of the load is guaranteed.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (14)
1. a power supply control circuit is characterized by comprising a transformer, a switching power supply module, a current detection module, a voltage stabilization module and a pulse current generator;
The transformer includes: the switching power supply comprises a primary coil, a secondary coil and an auxiliary coil, wherein one end of the primary coil is connected with a power supply, the other end of the primary coil is connected with a first port of the switching power supply module, and the secondary coil is connected with a load;
The input end of the current detection module is connected with one end of the load, and the output end of the current detection module is connected with the input end of the pulse current generator, and the current detection module is used for detecting a current signal of the load and sending the current signal to the pulse current generator;
The output end of the pulse current generator is connected with the secondary coil and outputs a pulse signal according to the current signal of the current detection module;
the control port of the switching power supply module is connected with the auxiliary coil through the voltage stabilizing module and used for receiving a voltage signal output by the auxiliary coil and controlling the on/off of a built-in switch in the switching power supply module according to the voltage signal;
and the detection port of the switching power supply module is connected with the auxiliary coil, receives the induction pulse signal of the pulse signal in the auxiliary coil, and controls the working frequency of the switching power supply module according to the induction pulse signal.
2. The power control circuit of claim 1,
The voltage stabilization module includes: a first resistor and a second resistor;
One end of the first resistor is connected with the auxiliary coil, and the other end of the first resistor is connected with one end of the second resistor;
The other end of the second resistor is grounded;
The control port is connected with the connecting end of the first resistor and the second resistor.
3. The power supply control circuit of claim 2, wherein the voltage regulator module further comprises: a rectifier diode;
The first resistor is connected with the auxiliary coil through the rectifier diode.
4. the power control circuit of claim 1, wherein the current detection module comprises: the device comprises a current sampling unit, a reference voltage unit and a comparison unit;
The input end of the current sampling unit is connected with one end of the load, the output end of the current sampling unit is connected with the first input end of the comparison unit,
the output end of the reference voltage unit is connected with the second input end of the comparison unit;
the output end of the comparison unit is connected with the input end of the pulse current generator.
5. The power control circuit of claim 4, wherein the current sampling circuit comprises: the operational amplifier comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor and an operational amplifier;
one end of the third resistor is connected with the input end of the current sampling circuit, the other end of the third resistor is respectively connected with one end of the fourth resistor and one end of the fifth resistor, the other end of the fourth resistor is grounded, the other end of the fifth resistor is respectively connected with one end of the sixth resistor and the positive input end of the operational amplifier, the other end of the sixth resistor is externally connected with a level signal, the negative input end of the operational amplifier is respectively connected with one end of the seventh resistor and one end of the eighth resistor, the other end of the seventh resistor is grounded, and the output end of the operational amplifier is respectively connected with the other end of the eighth resistor and the output end of the current sampling circuit.
6. the power control circuit of claim 5, wherein the current sampling circuit further comprises: a ninth resistor, a tenth resistor, an eleventh resistor, a first capacitor, a second capacitor and a third capacitor;
The ninth resistor is connected with the fourth resistor in parallel, one end of the tenth resistor is connected with the output end of the operational amplifier, the other end of the tenth resistor is grounded, the output end of the operational amplifier is connected with the output end of the current sampling unit through the eleventh resistor, the first capacitor is connected with the eighth resistor in parallel, one end of the second capacitor is connected with the output end of the current sampling unit, the other end of the second capacitor is grounded, one end of the third capacitor is connected with the positive input end of the operational amplifier, and the other end of the third capacitor is grounded.
7. the power supply control circuit according to claim 4, wherein the reference voltage unit comprises: a twelfth resistor, a thirteenth resistor, a fourteenth resistor and a first voltage stabilizing subunit;
one end of the twelfth resistor is externally connected with a level signal, the other end of the twelfth resistor is respectively connected with one end of the thirteenth resistor, the first end of the first voltage-stabilizing subunit and the second input end of the comparison unit, the second end of the first voltage-stabilizing subunit is respectively connected with the other end of the thirteenth resistor and one end of the fourteenth resistor, and the third end of the first voltage-stabilizing subunit and the other end of the fourteenth resistor are grounded.
8. the power control circuit of claim 7,
The first voltage-stabilizing subunit is a TL431 chip.
9. The power supply control circuit according to claim 4, wherein the comparison unit includes: a comparator for comparing the voltage of the output signal with a reference voltage,
the first input end of the comparator is connected with the output end of the current sampling circuit, the second input end of the comparator is connected with the output end of the reference voltage unit, and the output end of the comparator is connected with the input end of the pulse current generator.
10. The power control circuit of claim 9, wherein the comparison unit further comprises: a fifteenth resistor, a sixteenth resistor, a fourth capacitor, a fifth capacitor and a sixth capacitor;
One end of the fifteenth resistor is connected with the first input end of the comparison unit, the other end of the fifteenth resistor is connected with the first input end of the comparator, one end of the sixteenth resistor is connected with the output end of the comparator, the other end of the sixteenth resistor is connected with the output end of the comparison unit, one end of the fourth capacitor is connected with the second input end of the comparator, the other end of the fourth capacitor is grounded, one end of the fifth capacitor is connected with the first input end of the comparator, the other end of the fifth capacitor is grounded, one end of the sixth capacitor is respectively connected with the output end of the comparator and one end of the sixteenth capacitor, and the other end of the sixth capacitor is grounded.
11. The power control circuit according to any one of claims 1 to 10, wherein the switching power supply module further comprises:
And the voltage detection port is connected with the primary coil of the transformer and is used for detecting a voltage signal of the switching power supply module and performing voltage protection on the switching power supply module according to the voltage signal.
12. The power control circuit according to any one of claims 1 to 10, further comprising:
and one end of the freewheeling diode is connected with one end of the secondary coil of the transformer, and the other end of the freewheeling diode is connected with the corresponding end of the load.
13. The power control circuit according to any one of claims 1 to 10, further comprising:
The two ends of the seventh capacitor are respectively connected with the two ends of the power supply; and/or
And one end of the eighth capacitor is connected with one end of the load, and the other end of the eighth capacitor is grounded.
14. an electrical device, comprising: the power control circuit of any of claims 1-13, further comprising: a power supply and an electrical equipment main body;
the power supply supplies power to the electrical equipment main body through the power supply control circuit.
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