CN210444178U - Power control circuit and electrical equipment - Google Patents
Power control circuit and electrical equipment Download PDFInfo
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- CN210444178U CN210444178U CN201921701363.2U CN201921701363U CN210444178U CN 210444178 U CN210444178 U CN 210444178U CN 201921701363 U CN201921701363 U CN 201921701363U CN 210444178 U CN210444178 U CN 210444178U
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Abstract
The utility model provides a power control circuit and electrical equipment, this power control circuit includes: the device comprises a transformer, a switching power supply chip, a current detection module and a pulse current generator, wherein one end of a primary coil of the transformer is externally connected with a power supply, the other end of the primary coil of the transformer is connected with a first output pin of the switching power supply chip, and a secondary coil of the transformer is externally connected with a load; the control pin of the switching power supply chip is connected with the secondary coil, the input end of the current detection module is connected with one end of the load, the output end of the current detection module is connected with the input end of the pulse current generator, and the detection pin of the switching power supply chip is connected with the output end of the pulse current generator. Through the detection to load current, the operating frequency of control switching power supply chip makes it be in low frequency mode when the standby state is underloaded promptly, realizes switching power supply chip's low-power consumption and is close zero watt standby even, has avoided the waste of the energy, and is energy-concerving and environment-protective to be in high frequency mode when the heavy load, the guarantee load normal work is not influenced.
Description
Technical Field
The utility model relates to the technical field of household appliances, concretely relates to power 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.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the utility model provides a power control circuit and electrical equipment are provided to overcome electrical apparatus settings such as steaming and baking dual-energy machine among the prior art, air conditioner in the standby process consumption height, cause the extravagant problem of energy.
According to a first aspect, an embodiment of the present invention provides a power control circuit, including: the power supply comprises a transformer, a switching power supply chip, a current detection module and a pulse current generator, wherein one end of a primary coil of the transformer is externally connected with a power supply, the other end of the primary coil of the transformer is connected with a first output pin of the switching power supply chip, and a secondary coil of the transformer is externally connected with a load; the control pin of the switching power supply chip is connected with the secondary coil and used for receiving a voltage signal output by the secondary coil and controlling the on-off of a built-in switch of the switching power supply chip according to the voltage signal; 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 to generate a pulse trigger signal; and the detection pin of the switching power supply chip is connected with the output end of the pulse current generator and is used for receiving the pulse trigger signal and controlling the working frequency of the switching power supply chip according to the pulse trigger signal.
Optionally, the power control circuit further includes: a voltage regulator circuit, the voltage regulator circuit comprising: the power supply comprises a first resistor, a second resistor and a first voltage stabilizing chip, wherein one end of the first resistor is connected with one end of the load, the other end of the first resistor is connected with one end of the second resistor and the first end of the first voltage stabilizing chip respectively, the other end of the second resistor is connected with the second end of the first voltage stabilizing chip and then grounded, and the third end of the first voltage stabilizing chip is connected with a control pin of the switching power supply chip.
Optionally, the power control circuit further includes: an isolation circuit, the isolation circuit comprising: the first input end of the first isolating switch is connected with one end of the load through the third resistor, the second input end of the first isolating switch is connected with the third end of the first voltage stabilizing chip, the first output end of the first isolating switch is connected with the primary coil of the transformer through the rectifying diode and then grounded, and the second output end of the first isolating switch is connected with the control pin of the switching power supply chip; the first input end of the second isolating switch is connected with the output end of the pulse current generator through the fourth resistor, the second input end of the second isolating switch is grounded, the first output end of the second isolating switch is connected with the first output end of the first isolating switch, and the second output end of the second isolating switch is connected with the detection pin of the switching power supply chip.
Optionally, the current detection module includes: the circuit comprises a current sampling circuit, a reference voltage generating circuit and a comparison circuit, wherein the input end of the current sampling circuit is connected with one end of the load, and the output end of the current sampling circuit is connected with the first input end of the comparison circuit; the input end of the reference voltage generating circuit is externally connected with a level signal, and the output end of the reference voltage generating circuit is connected with the second input end of the comparison circuit; the output end of the comparison circuit is connected with the input end of the pulse current generator.
Optionally, the current sampling circuit comprises: the load circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor and an operational amplifier, wherein one end of the load is connected with one end of the fifth resistor, the other end of the fifth resistor is respectively connected with one end of the sixth resistor and one end of the seventh resistor, the other end of the sixth resistor is grounded, the other end of the seventh resistor is respectively connected with one end of the eighth resistor and a positive input end of the operational amplifier, the other end of the eighth resistor is externally connected with a level signal, a negative input end of the operational amplifier is respectively connected with one end of the ninth resistor and one end of the tenth resistor, an output end of the operational amplifier is respectively connected with the other end of the tenth resistor and a first input end of the comparison circuit, and the other end of the ninth resistor is grounded.
Optionally, the reference voltage generating circuit includes: the voltage stabilizing circuit comprises an eleventh resistor, a twelfth resistor, a thirteenth resistor and a second voltage stabilizing chip, wherein one end of the eleventh resistor is externally connected with a level signal, the other end of the eleventh resistor is respectively connected with one end of the twelfth resistor, the first end of the second voltage stabilizing chip and the second input end of the comparison circuit, the second end of the second voltage stabilizing chip is respectively connected with the other end of the twelfth resistor and one end of the thirteenth resistor, and the third end of the second voltage stabilizing chip is connected with the other end of the thirteenth resistor and then grounded.
Optionally, the comparison circuit comprises: and 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 generating circuit, and the output end of the comparator is connected with the input end of the pulse current generator.
Optionally, the current sampling circuit further comprises: the operational amplifier comprises a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a first capacitor and a second capacitor, wherein the fourteenth resistor is connected with the sixth resistor in parallel, the fifteenth resistor is connected with the output end of the operational amplifier and then grounded, one end of the sixteenth resistor is connected with the output end of the operational amplifier, the other end of the sixteenth resistor is connected with the second capacitor and then grounded, and the first capacitor is connected with the tenth resistor in parallel.
Optionally, the comparison circuit further comprises: seventeenth resistance, eighteenth resistance, third electric capacity, fourth electric capacity and fifth electric capacity, wherein, the one end of seventeenth resistance with current sampling circuit's output is connected, the other end with the first input of comparator is connected, the one end of eighteenth resistance with the output of comparator is connected, the other end with pulse current generator's input is connected, the third electric capacity with ground connection after the first input of comparator is connected, the fourth electric capacity with ground connection after the second input of comparator is connected, the fifth electric capacity with ground connection after the output of comparator is connected.
Optionally, a voltage detection pin of the switching power supply chip is connected to the primary coil of the transformer, and is configured to detect a voltage signal of the switching power supply chip and perform voltage protection on the switching power supply chip according to the voltage signal.
Optionally, the power control circuit further comprises: 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 one end of the load.
Optionally, the power control circuit further comprises: the power supply comprises a sixth capacitor and a seventh capacitor, wherein the sixth capacitor is connected to two ends of the power supply in parallel, and the seventh capacitor is connected with one end of the load and then grounded.
Optionally, the first voltage regulation chip is a TL431 first voltage regulation chip.
Optionally, the first isolation switch and the second isolation switch are photocouplers.
According to a second aspect, the embodiment of the present invention further provides an electrical apparatus, including: power supply, electrical equipment main part reach the utility model discloses another embodiment in power control circuit, wherein, power supply passes through power control circuit is to the electrical equipment main part power supply.
The utility model discloses technical scheme has following advantage:
1. the embodiment of the utility model provides a power control circuit, include: the device comprises a transformer, a switching power supply chip, a current detection module and a pulse current generator, wherein one end of a primary coil of the transformer is externally connected with a power supply, the other end of the primary coil of the transformer is connected with a first output pin of the switching power supply chip, and a secondary coil of the transformer is externally connected with a load; the control pin of the switching power supply chip is connected with the secondary coil, the input end of the current detection module is connected with one end of the load, the output end of the current detection module is connected with the input end of the pulse current generator, and the detection pin of the switching power supply chip is connected with the output end of the pulse current generator. Therefore, through the detection of the load current, the working frequency of the switching power supply chip is controlled, namely the on-off frequency of the built-in switch of the switching power supply chip is controlled, and further the output voltage of the secondary coil of the transformer is controlled, the switching power supply chip is in a low-frequency working mode when the load is in a standby state, the low power consumption of the switching power supply chip is even close to zero watt standby, the waste of energy is avoided, the energy is saved, the environment is protected, the switching power supply chip is in a high-frequency working mode when the load is heavy, and the normal work of the load is not influenced.
2. The embodiment of the utility model provides an electrical equipment, include: power supply, electrical equipment main part reach the utility model discloses another embodiment in power control circuit, wherein, power supply passes through power control circuit is to the electrical equipment main part power supply. The power consumption of the electrical equipment in a standby state is reduced through the power control circuit, low power consumption and even zero watt standby are realized, the energy waste is avoided, and the electrical equipment is more energy-saving and environment-friendly.
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 embodiments or the technical solutions in 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 for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural 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 schematic waveform diagram of a pulse trigger 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
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.
The technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
Fig. 1 shows a schematic diagram of a power control circuit, which includes, as shown in fig. 1: the transformer T, the switching power supply chip U1, the current detection module U2 and the pulse current generator U3, wherein one end of a primary coil of the transformer T is externally connected with a power supply AC, the other end of the primary coil of the transformer T is connected with a first output pin D of the switching power supply chip U1, and a secondary coil of the transformer T is externally connected with a load RL; a control pin FB of the switching power supply chip U1 is connected with the secondary coil and used for receiving a voltage signal output by the secondary coil and controlling the on and off of a built-in switch of the switching power supply chip U1 according to the voltage signal; the input end of the current detection module U2 is connected with one end of the load RL, and the output end of the current detection module U2 is connected with the input end of the pulse current generator U3, and the current detection module U2 is used for detecting a current signal of the load RL and sending the current signal to the pulse current generator U3 to generate a pulse trigger signal; the detection pin CS of the switching power supply chip U1 is connected to the output terminal of the pulse current generator U3, and is configured to receive the pulse trigger signal and control the operating frequency of the switching power supply chip U1 according to the pulse trigger signal. In practical application, the power supply AC is an AC power supply, for example, 220V commercial power, in practical application, the AC power supply such as commercial power needs to supply power for the load RL after converting the AC power into the DC power through the AC-DC conversion circuit, in the embodiment of the present invention, as shown in fig. 1, this AC-DC conversion circuit is implemented by using a bridge circuit, and in practical application, the AC-DC conversion circuit in other prior art can also be implemented by using the AC-DC conversion circuit to convert the AC power into the DC power, which is not limited by the present invention. The load RL may be a household appliance such as a steaming and baking dual-energy machine and an air conditioner.
Specifically, be provided with the switch in above-mentioned switching power supply chip U1's inside, in the embodiment of the utility model provides an, the built-in switch of this switching power supply chip U1 is the MOS pipe, switching power supply chip U1 through the turn-off and the opening of the inside MOS pipe of control to the realization is to transformer T secondary coil output voltage's control, according to the electromagnetic induction principle, when the MOS pipe is opened, above-mentioned transformer T primary coil energy storage, when the MOS pipe is turned off, transformer TT1 primary coil energy transmission to secondary coil. As shown in fig. 1, the first output pin D of the switching power supply chip U1 is a drain pin of a MOS (the MOS has a gate pin, a drain pin, and a source pin). The MOS tube is a switch, a drain electrode pin of the MOS tube is connected with a primary coil, an S pin of a power supply chip U1, namely a source electrode pin of the MOS tube, is connected with the ground, a control pin FB of a switch power supply chip U1, namely a grid electrode pin of the MOS tube, is connected with a secondary coil, receives feedback of output voltage, controls the on-off of the MOS tube through the FB pin according to the feedback of the output voltage, when the FB pin inputs a high level, the MOS tube is conducted, the primary coil is charged, when the FB pin inputs a low level, the MOS tube is disconnected, energy charged before the primary coil is reversely excited to the secondary coil, and outputs voltage to a load RL. The detection pin CS of the switching power supply chip U1 is a wake-up pin, and receives the pulse trigger signal output by the pulse current generator U3, after the CS pin detects the pulse trigger signal, it indicates that the load RL is heavily loaded at this time, it is necessary to wake up the switching power supply chip U1 to enter a high-frequency operating mode, that is, to increase the on-off frequency of the internal MOS transistor, and if the pulse trigger signal is not detected, it indicates that the load RL is lightly loaded at this time, that is, the load RL is in a standby state, and the switching power supply chip U1 is controlled to enter a low-frequency operating mode, that is, to decrease the on-off frequency of the internal MOS transistor, so as to. It should be noted that, the switching power supply chip U1 can carry out nimble setting according to actual load RL's demand at the specific operating frequency of high frequency mode and low frequency mode, that is, the turn-on turn-off frequency of MOS transistor, the utility model discloses do not use this as the limit. In practical applications, the switching power supply chip U1 may be set to enter a low frequency operation mode, i.e., a low power consumption mode or a sleep mode, when no pulse trigger signal is detected within a preset time period; after the pulse trigger signal is detected, the high-frequency working mode is entered, the normal working mode is entered, the load RL is an electric product, and when the electric product is in the standby mode, the load RL is light, so that the switching power supply chip U1 only needs to work in the low-frequency mode to ensure the stability of the output voltage, and after the low-frequency mode is entered, the loss of the built-in MOS switch is greatly reduced, and the low-power consumption, even the standby power consumption close to zero watt can be realized.
In practical applications, as shown in fig. 1, the voltage detection pin HV of the switching power chip U1 is connected to the primary winding of the transformer T, and is used for detecting the voltage signal of the switching power chip U1 and performing voltage protection on the switching power chip U1 according to the voltage signal. Specifically, the switching power supply chip U1 has an overvoltage and undervoltage protection detection function, and when it is detected that the switching power supply chip U1 has overvoltage or undervoltage, the switching power supply chip U1 intermittently resets until the voltage is normal, thereby realizing overvoltage protection and undervoltage protection of the switching power supply chip U1.
In practical applications, as shown in fig. 1, the power control circuit further includes: a freewheeling diode D4 has one end of a freewheeling diode D4 connected to one end of the secondary winding of the transformer T and the other end connected to one end of the load RL. Specifically, the freewheeling diode D4 is used to provide a continuous current to the load RL to prevent the load RL from suddenly changing current and to smooth the current.
In practical applications, as shown in fig. 1, the power control circuit further includes: the sixth capacitor C6 and the seventh capacitor C7, wherein the sixth capacitor C6 is connected in parallel to two ends of the power supply AC, and the seventh capacitor C7 is connected to one end of the load RL and then grounded. Specifically, the sixth capacitor C6 and the seventh capacitor C7 are both filter capacitors and function as a filter.
Specifically, in an embodiment, as shown in fig. 1, the power control circuit further includes a voltage stabilizing circuit 21, the voltage stabilizing circuit 21 includes a first resistor R1, a second resistor R2 and a first voltage stabilizing chip U4, wherein one end of the first resistor R1 is connected to one end of the load RL, the other end is connected to one end of the second resistor R2 and a first end of the first voltage stabilizing chip U4, respectively, the other end of the second resistor R2 is connected to a second end of the first voltage stabilizing chip U4 and then grounded, and a third end of the first voltage stabilizing chip U4 is connected to the control pin FB of the switching power chip U1, in the embodiment, the first voltage stabilizing chip U4 employs a TL voltage stabilizing chip, the first voltage stabilizing chip U4 internally includes a reference voltage of 2.5V, wherein the first resistor R1 and the second resistor R2 are voltage dividing resistors for adjusting the output voltage of the transformer T secondary coil, i.e., the formula of the output voltage Vout may be calculated by using a formula of a voltage stabilizing circuit R1, which is similar to the voltage stabilizing chip R27, and may be used as a voltage stabilizing chip, so that the output voltage stabilizing voltage of the load RL 27, the voltage stabilizing chip may be a voltage regulator chip applicable to other practical voltage stabilizing chip, and the voltage stabilizing chip may be described as a practical voltage stabilizing chip, a practical voltage stabilizing chip, i.e., a practical voltage stabilizing chip, which may be implemented as a practical voltage stabilizing chip, i.e. a practical voltage stabilizing chip, and may be implemented as a practical voltage stabilizing chip, a.
Specifically, in an embodiment, as shown in fig. 1, the power control circuit further includes: an isolation circuit 22, the isolation circuit 22 comprising: the transformer T comprises a third resistor R3, a fourth resistor R4, a first isolating switch D1, a second isolating switch D2 and a rectifier diode D3, wherein a first input end of a first isolating switch D1 is connected with one end of a load RL through the third resistor R3, a second input end of the first isolating switch D1 is connected with a third end of a first voltage stabilizing chip U4, a first output end of the first isolating switch D3 is connected with a primary coil of the transformer T and then grounded, and a second output end of the first isolating switch D1 is connected with a control pin FB of a switching power supply chip U1; the first input end of the second isolating switch D2 is connected with the output end of the pulse current generator U3 through the fourth resistor R4, the second input end is grounded, the first output end is connected with the first output end of the first isolating switch D1, and the second output end is connected with the detection pin CS of the switching power supply chip U1. Because the external power supply of transformer T primary side is the forceful electric power signal among the above-mentioned power control circuit, and transformer T secondary side is the light current signal, can take place the interference between the light current and the strong current, in order to ensure the safety of whole power control power, need realize the isolation of light current and strong current the embodiment of the utility model provides an in, foretell first isolator D1 is photoelectric coupler with second isolator D2, through utilizing photoelectric coupler to carry out the isolation of light current and strong current, has realized power control circuit's safety isolation to have the realization scheme simple, with low costs, automatic efficient and good reliability's characteristics. It should be noted that, in the embodiment of the present invention, the optoelectronic coupler is taken as an example for explanation, in practical application, the first isolating switch D1 and the second isolating switch D2 may also be selected from other switch devices with strong and weak electric isolation functions in the prior art, such as circuit breakers, as long as the same or similar functions as the optoelectronic coupler can be realized, and the present invention is not limited thereto.
Specifically, in an embodiment, as shown in fig. 2, the current detection module U2 includes: the circuit comprises a current sampling circuit 11, a reference voltage generating circuit 12 and a comparison circuit 13, wherein the input end of the current sampling circuit 11 is connected with one end of a load RL, and the output end of the current sampling circuit 11 is connected with a first input end of the comparison circuit 13; the input end of the reference voltage generating circuit 12 is externally connected with a level signal, and the output end is connected with the second input end of the comparison circuit 13; an output of the comparison circuit 13 is connected to an input of a pulse current generator U3.
Specifically, as shown in fig. 2, the current sampling circuit 11 described above includes: a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10 and an operational amplifier U6, wherein one end of the load RL is connected to one end of the fifth resistor R5, the other end of the fifth resistor R5 is connected to one end of the sixth resistor R6 and one end of the seventh resistor R7, the other end of the sixth resistor R6 is grounded, the other end of the seventh resistor R7 is connected to one end of the eighth resistor R8 and a positive input end of the operational amplifier U6, the other end of the eighth resistor R8 is externally connected to a level signal, a negative input end of the operational amplifier U6 is connected to one end of the ninth resistor R9 and one end of the tenth resistor R10, an output end of the operational amplifier U6 is connected to the other end of the tenth resistor R10 and a first input end of the comparator circuit 13, and the other end of the ninth resistor R9 is grounded. In practical application, as shown in fig. 2, + VIN is connected to Vout shown in fig. 1, voltage VC is obtained after voltage division and sampling by the fifth resistor R5 and the sixth resistor R6, sampling current is obtained after the voltage division and sampling by the seventh resistor R7, and the sampling current is amplified by the op-amp, so that a corresponding sampling voltage Vcurrent is obtained and input to the comparison circuit 13. The sampling voltage Vcurrent may be specifically calculated by the following formula:
Vcurrent＝VCC＊(R7/(R7+R8))＊((R9+R10)/R10)+
VC＊(R8/(R7+R8))＊((R9+R10)/R9)
in practical applications, as shown in fig. 2, the current sampling circuit 11 further includes: a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a first capacitor C1 and a second capacitor C2, wherein the fourteenth resistor R14 is connected in parallel with the sixth resistor R6, the fifteenth resistor R15 is connected with the output end of the operational amplifier U6 and then grounded, one end of the sixteenth resistor R16 is connected with the output end of the operational amplifier U6, the other end of the sixteenth resistor R2 is connected with the second capacitor C2 and then grounded, and the first capacitor C1 is connected in parallel with the tenth resistor R10. In the embodiment of the present invention, the fifteenth resistor R15 is a ground-pulling resistor for avoiding "suspension" of voltage, causing instability of the circuit, the first capacitor C1 is used for filtering out interference of differential signals, and plays a role of filtering, and the sixteenth resistor R16 and the second capacitor form a filter circuit for filtering out interference in amplified current signals.
Specifically, as shown in fig. 2, the reference voltage generation circuit 12 described above includes: an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, and a second voltage regulation chip U5, wherein one end of the eleventh resistor R11 is externally connected to a level signal, the other end of the eleventh resistor R11 is respectively connected to one end of the twelfth resistor R12, a first end of the second voltage regulation chip U5, and a second input end of the comparator circuit 13, a second end of the second voltage regulation chip U5 is respectively connected to the other end of the twelfth resistor R12 and one end of the thirteenth resistor R13, and a third end of the second voltage regulation chip U5 is connected to the other end of the thirteenth resistor R13 and then grounded. The embodiment of the utility model provides an in, can produce stable reference voltage VREF through this reference voltage generating circuit 12 in the embodiment of the utility model provides an, this second voltage stabilizing chip U5 adopts the first voltage stabilizing chip U4 of TL431, this second voltage stabilizing chip U5 is inside to contain a 2.5V's reference voltage, wherein twelfth resistance R12 and thirteenth resistance R13 are divider resistance for adjust the reference voltage VREF of the output of reference voltage generating circuit 12, thereby can realize the effect of regulation and stable output reference voltage VREF through this voltage stabilizing circuit. The reference voltage VREF is input to the comparison circuit 13 as the reference voltage VREF to be compared with the sampling voltage output by the current sampling circuit 11, so as to determine whether the current load RL is under light load or heavy load. In practical applications, the reference voltage generating circuit 12 may be omitted to simplify the circuit structure, for example: the present invention can directly input a fixed level signal to the comparison circuit 13 as the reference voltage VREF, which is not limited by the present invention.
Specifically, as shown in fig. 2, the comparator circuit 13 described above includes: and a comparator U7, wherein a first input terminal of the comparator U7 is connected to the output terminal of the current sampling circuit 11, a second input terminal is connected to the output terminal of the reference voltage generating circuit 12, and an output terminal is connected to the input terminal of the pulse current generator U3. In practical applications, the comparator U7 compares the sampling voltage output by the current sampling circuit 11 with the reference voltage VREF generated by the reference voltage generating circuit 12, and further determines whether the current load RL is light load or heavy load, for example: when the sampling voltage is greater than the reference voltage VREF, a high level signal, i.e., Vout1 is output at VCC, and when the sampling voltage is less than the reference voltage VREF, a low level signal, i.e., Vout1 is output at 0V. Specifically, when Vout1 is at a high level, i.e., when the current in the load RL is greater than the set value I, the high level is input to the pulse current generator U3, so that the pulse current generator U3 sends out the pulse trigger signal as shown in fig. 3. (the pulse current generator U3 can be a master IC, Vout1 is connected to one of the I/O ports of the master IC, and when the I/O port detects an input high level, a square wave pulse signal as shown in FIG. 3 is emitted)
In practical applications, as shown in fig. 2, the comparison circuit 13 further includes: a seventeenth resistor R17, an eighteenth resistor R18, a third capacitor C3, a fourth capacitor C4 and a fifth capacitor C5, wherein one end of the seventeenth resistor R17 is connected to the output end of the current sampling circuit 11, the other end of the seventeenth resistor R3538 is connected to the first input end of the comparator U7, one end of the eighteenth resistor R18 is connected to the output end of the comparator U7, the other end of the eighteenth resistor R18 is connected to the input end of the pulse current generator U3, the third capacitor C3 is connected to the first input end of the comparator U7 and then grounded, the fourth capacitor C4 is connected to the second input end of the comparator U7 and then grounded, and the fifth capacitor C5 is connected to the output end of the comparator U7 and then grounded. In the embodiment of the present invention, the third capacitor C3 and the fourth capacitor C4 have a filtering function, the seventeenth resistor R17 has a current-limiting function, and the eighteenth resistor R18 and the fifth capacitor C5 form a filter circuit for filtering the interference of the output voltage signal of the comparison circuit 13.
The working principle and working process of the power control circuit provided by the embodiment of the present invention will be described in detail with reference to specific application examples.
In the power control circuit shown in fig. 1, assuming that the load RL in the power control circuit is a dual-energy steaming and baking machine, when the dual-energy steaming and baking machine is operating normally, the voltage of the output voltage of the transformer T is detected by the first voltage stabilizing chip U4, the first voltage stabilizing chip U4 contains a reference voltage VREF of 2.5V, and the output voltage of the transformer T is divided by the resistors R1 and R2. When the output voltage is higher than a certain value, the partial voltage is greater than 2.5V, the first voltage stabilizing chip U4 is turned on, the first isolating switch D1 is turned on, and meanwhile, the MOS transistor in the switching power supply chip U1 is turned on, and the primary coil of the transformer T is charged. When the output voltage is low, the divided voltage is less than 2.5V, the TL431 chip is disconnected, the first isolating switch D1 is disconnected, the MOS tube in the switching power supply chip U1 is disconnected, and the primary coil stores energy and is flyback to the secondary coil so as to improve the output voltage. Meanwhile, the sampling current value detected by the current detection module U2 is relatively large, and then a high level signal is output to the pulse current generator U3, after the pulse current generator U3 receives the high level signal, a pulse trigger signal as shown in fig. 4 is generated, and the pulse trigger signal is output to the detection pin CS of the switching power supply chip U1, when the pulse trigger signal is detected by the switching power supply chip U1, the switching power supply chip U1 is waken to enter a high-frequency working mode, that is, the on-off frequency of the built-in MOS transistor is increased, and a working voltage of normal working is output to the steaming and baking dual-energy machine through the transformer T, so that the normal working of the steaming and baking dual-energy machine is ensured.
When the steaming and baking dual-energy machine is in a standby state, the current value detected by the current detection module U2 is relatively small, and then a low level signal is output to the pulse current generator U3, and the pulse current generator U3 does not generate a pulse trigger signal after receiving the low level signal, so that the input of the detection pin CS of the switching power supply chip U1 is 0V, at the moment, when the switching power supply chip U1 does not detect the pulse trigger signal within a preset time period, the switching power supply chip U1 is controlled to enter a low-frequency working mode, namely a low-power mode or a sleep mode, the switching-on and switching-off frequency of the built-in MOS tube is reduced, so that the power consumption is reduced, and the waste of energy is reduced. In practical application, this length of predetermineeing time period can set up according to actual need, the utility model discloses do not use this as the limit. When the electric appliance product of the steaming and baking dual-energy machine is in a standby mode, the load RL is light, so that the switching power supply chip U1 can ensure stable output voltage only by working in a low-frequency mode, the loss of the built-in MOS switch is greatly reduced after the electric appliance product enters the low-frequency mode, and low power consumption, even the standby power consumption close to zero watt can be realized.
Through cooperation of each above-mentioned component part, the embodiment of the utility model provides a power control circuit, through the detection to load current, control switching power supply chip's operating frequency, control the turn-on and turn-off frequency of its built-in switch promptly, and then control transformer secondary coil's output voltage, switching power supply chip is in low frequency mode when load RL underloading promptly under the standby state, the low-power consumption that has realized switching power supply chip is close zero watt standby even, the waste of the energy has been avoided, energy-concerving and environment-protective, and switching power supply chip is in high frequency mode when the heavy load, the normal work of guarantee load is not influenced. Utilize TL431 chip to adjust and stabilize output voltage simultaneously to utilize photoelectric coupler to keep apart strong and weak electricity, realize for realizing safe isolation, the embodiment of the utility model provides a circuit scheme has simple structure, with low costs, automatic efficient, the good reliability's advantage.
The embodiment of the utility model provides an electrical equipment is still provided, as shown in FIG. 4, this electrical equipment includes: power supply AC, electrical equipment main part 1 and the utility model discloses power control circuit 2 in another embodiment, wherein, power supply AC passes through power control circuit 2 and supplies power to electrical equipment main part 1. For the detailed description of the power control circuit 2, reference is made to the related contents of the power control circuit in the above embodiments, and the detailed description is omitted here. In practical application, the electrical apparatus main body 1 may be a household electrical appliance provided with a switching power supply chip, such as a steaming and baking dual-energy machine and an air conditioner, and the present invention is not limited thereto.
Through the cooperation in coordination of above-mentioned each component, the embodiment of the utility model provides an electrical equipment, include: power supply, electrical equipment main part reach the utility model discloses power control circuit in another embodiment, wherein, power supply passes through power control circuit and supplies power to electrical equipment main part. The power consumption of the electrical equipment in a standby state is reduced through the power control circuit, low power consumption and even zero watt standby are realized, the energy waste is avoided, and the electrical equipment is more energy-saving and environment-friendly.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (15)
1. A power control circuit, comprising: a transformer, a switch power supply chip, a current detection module and a pulse current generator, wherein,
one end of a primary coil of the transformer is externally connected with a power supply, the other end of the primary coil of the transformer is connected with a first output pin of the switching power supply chip, and a secondary coil of the transformer is externally connected with a load;
the control pin of the switching power supply chip is connected with the secondary coil and used for receiving a voltage signal output by the secondary coil and controlling the on-off of a built-in switch of the switching power supply chip according to the voltage signal;
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 to generate a pulse trigger signal;
and the detection pin of the switching power supply chip is connected with the output end of the pulse current generator and is used for receiving the pulse trigger signal and controlling the working frequency of the switching power supply chip according to the pulse trigger signal.
2. The power control circuit of claim 1, further comprising: a voltage regulator circuit, the voltage regulator circuit comprising: a first resistor, a second resistor and a first voltage stabilizing chip, wherein,
one end of the first resistor is connected with one end of the load, the other end of the first resistor is connected with one end of the second resistor and the first end of the first voltage stabilizing chip respectively, the other end of the second resistor is connected with the second end of the first voltage stabilizing chip and then grounded, and the third end of the first voltage stabilizing chip is connected with the control pin of the switching power supply chip.
3. The power control circuit of claim 2, further comprising: an isolation circuit, the isolation circuit comprising: a third resistor, a fourth resistor, a first isolating switch, a second isolating switch and a rectifying diode, wherein,
a first input end of the first isolating switch is connected with one end of the load through the third resistor, a second input end of the first isolating switch is connected with a third end of the first voltage stabilizing chip, a first output end of the first isolating switch is connected with a primary coil of the transformer through the rectifier diode and then grounded, and a second output end of the first isolating switch is connected with a control pin of the switching power supply chip;
the first input end of the second isolating switch is connected with the output end of the pulse current generator through the fourth resistor, the second input end of the second isolating switch is grounded, the first output end of the second isolating switch is connected with the first output end of the first isolating switch, and the second output end of the second isolating switch is connected with the detection pin of the switching power supply chip.
4. The power control circuit of claim 1, wherein the current detection module comprises: a current sampling circuit, a reference voltage generating circuit, and a comparing circuit, wherein,
the input end of the current sampling circuit is connected with one end of the load, and the output end of the current sampling circuit is connected with the first input end of the comparison circuit;
the input end of the reference voltage generating circuit is externally connected with a level signal, and the output end of the reference voltage generating circuit is connected with the second input end of the comparison circuit;
the output end of the comparison circuit 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: a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, and an operational amplifier,
one end of the load is connected with one end of the fifth resistor, the other end of the fifth resistor is respectively connected with one end of the sixth resistor and one end of the seventh resistor, the other end of the sixth resistor is grounded, the other end of the seventh resistor is respectively connected with one end of the eighth resistor and the positive input end of the operational amplifier, the other end of the eighth resistor is externally connected with a level signal, the negative input end of the operational amplifier is respectively connected with one end of the ninth resistor and one end of the tenth resistor, the output end of the operational amplifier is respectively connected with the other end of the tenth resistor and the first input end of the comparison circuit, and the other end of the ninth resistor is grounded.
6. The power supply control circuit according to claim 4, wherein the reference voltage generation circuit comprises: an eleventh resistor, a twelfth resistor, a thirteenth resistor and a second voltage stabilizing chip,
one end of the eleventh resistor is externally connected with a level signal, the other end of the eleventh resistor is connected with one end of the twelfth resistor, the first end of the second voltage stabilizing chip and the second input end of the comparison circuit respectively, the second end of the second voltage stabilizing chip is connected with the other end of the twelfth resistor and one end of the thirteenth resistor respectively, and the third end of the second voltage stabilizing chip is connected with the other end of the thirteenth resistor and then grounded.
7. The power control circuit of claim 4, wherein the comparison circuit comprises: and 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 generating circuit, and the output end of the comparator is connected with the input end of the pulse current generator.
8. The power control circuit of claim 5, wherein the current sampling circuit further comprises: the operational amplifier comprises a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a first capacitor and a second capacitor, wherein the fourteenth resistor is connected with the sixth resistor in parallel, the fifteenth resistor is connected with the output end of the operational amplifier and then grounded, one end of the sixteenth resistor is connected with the output end of the operational amplifier, the other end of the sixteenth resistor is connected with the second capacitor and then grounded, and the first capacitor is connected with the tenth resistor in parallel.
9. The power control circuit of claim 7, wherein the comparison circuit further comprises: a seventeenth resistor, an eighteenth resistor, a third capacitor, a fourth capacitor, and a fifth capacitor, wherein,
one end of the seventeenth resistor is connected with the output end of the current sampling circuit, the other end of the seventeenth resistor is connected with the first input end of the comparator, one end of the eighteenth resistor is connected with the output end of the comparator, the other end of the eighteenth resistor is connected with the input end of the pulse current generator, the third capacitor is grounded after the first input end of the comparator is connected, the fourth capacitor is grounded after the second input end of the comparator is connected, and the fifth capacitor is grounded after the output end of the comparator is connected.
10. The power control circuit according to claim 1, wherein a voltage detection pin of the switching power chip is connected to the primary winding of the transformer, and configured to detect a voltage signal of the switching power chip and perform voltage protection on the switching power chip according to the voltage signal.
11. The power control circuit of claim 1, 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 one end of the load.
12. The power control circuit of claim 1, further comprising: a sixth capacitance and a seventh capacitance, wherein,
the sixth capacitor is connected to two ends of the power supply in parallel, and the seventh capacitor is connected with one end of the load and then grounded.
13. The power control circuit of claim 2, wherein the first voltage regulation chip is a TL431 first voltage regulation chip.
14. The power control circuit of claim 3, wherein the first isolation switch and the second isolation switch are photocouplers.
15. An electrical device, comprising: the electric power supply, the electric appliance main body and the electric power supply control circuit as claimed in any one of claims 1 to 14, wherein the electric power supply supplies electric power to the electric appliance main body through the electric power supply control circuit.
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| CN201921701363.2U CN210444178U (en) | 2019-10-11 | 2019-10-11 | Power control circuit and electrical equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021068703A1 (en) * | 2019-10-11 | 2021-04-15 | 珠海格力电器股份有限公司 | Power supply control circuit and electrical device |
| CN114924640A (en) * | 2022-05-13 | 2022-08-19 | 海光信息技术股份有限公司 | Heterogeneous processor and power consumption management method and power consumption management system thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021068703A1 (en) * | 2019-10-11 | 2021-04-15 | 珠海格力电器股份有限公司 | Power supply control circuit and electrical device |
| CN114924640A (en) * | 2022-05-13 | 2022-08-19 | 海光信息技术股份有限公司 | Heterogeneous processor and power consumption management method and power consumption management system thereof |
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