CN103401409A - Dynamic dummy load with simple structure - Google Patents
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- CN103401409A CN103401409A CN201310294567XA CN201310294567A CN103401409A CN 103401409 A CN103401409 A CN 103401409A CN 201310294567X A CN201310294567X A CN 201310294567XA CN 201310294567 A CN201310294567 A CN 201310294567A CN 103401409 A CN103401409 A CN 103401409A
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Abstract
The invention relates to a dynamic dummy load with a simple structure. The dynamic dummy load with the simple structure comprises a voltage sampling unit, a control unit, a dummy load body and a control switch, wherein the voltage sampling unit is used for collecting output voltage; the control unit is used for comparing output voltage and threshold value voltage and driving the control switch to be switched on and off; if the output voltage exceeds the threshold value voltage, the control switch is driven to be switched on, the dummy load is connected to the output voltage in parallel, and the dummy load is connected to work; if the output voltage is lower than the threshold value voltage, the control switch is switched off, and the dummy load body is cut off. According to the dynamic dummy load with the simple structure, which is disclosed by the invention, the output dummy load is dynamically loaded and cut off in a low-cost mode, and the dummy load loss can be effectively reduced. In addition, when the output voltage is low, the dummy load is automatically cut off, and the output voltage lowering tendency is objectively alleviated.
Description
Technical field
The present invention relates to a kind of dynamic dummy load, relate in particular to a kind of dynamic dummy load simple in structure.
Background technology
Power supply product extensive use in work and life.In order to meet the regulation requirement, avoid the complete zero load of power supply and deteriorate performance, a lot of power supplys all carry dummy load.
Usually, dummy load is only had an effect when the output external load is fully unloaded, and this moment, output voltage was likely higher because output is fully unloaded, and on low-cost multiple-output electric power, this phenomenon is particularly evident.And when exporting external load greater than dummy load power, just no longer needed dummy load.
Traditional dummy load is generally the ohmic load that is connected in parallel on output port.But, because be connected in parallel on output always,, all the time at consumed energy, make power-efficient not high.Simultaneously, also affect the power supply heat distribution, make thermal design more complicated, dummy resistance is due to long-term fever, and is all influential to reliability and the life-span of power supply product.In addition, under case of heavy load, output voltage is often on the low side, and the existence of dummy load also can aggravate lower voltage.
Therefore, the control method of some dynamic dummy loads is suggested, and the monolithic processor controlled dummy load of employing of mentioning in document [1] is exactly an example.This method is utilized single-chip microcomputer switching dummy load as required, can effectively reduce the power consumption of dummy load, improves power-efficient.The method adaptivity is poor, needs the single-chip microcomputer intervention, and cost is high.Be difficult to promote in the widely used low side application of power of dummy load occasion.In document [2], mentioned employing comparator relatively output current and reference current, in order to control triode switch, the method for automatic switching dummy load.The advantage of the method is can automatic switching dummy load in the underloading situation, and shortcoming is that circuit is complicated equally, and cost is high, is not suitable for the low side power supply.
[1] turn-on control circuit of the inner dummy load of CN201120337856.X DC power supply
[2] CN201120079429.6 Intelligent dummy load automatic switching control system
Summary of the invention
The present invention proposes a kind of simple in structurely for above problem, cost is low, the dynamic dummy load simple in structure that adaptivity is good.The present invention is particularly suitable for cost requirement than more sensitive low side power supply.
The invention provides a kind of dynamic dummy load simple in structure for above problem, it is characterized in that: comprise the voltage sample unit, control unit, dummy load body and control switch;
The voltage sample unit gathers output voltage, by control unit comparison output voltage and threshold voltage and drive control switch conducting and by, if output voltage surpasses threshold voltage, the driven conducting of control switch, the dummy load body is parallel on output voltage, the cut-in operation of dummy load body; If output voltage is lower than threshold voltage, control switch ends, and the dummy load body is disconnected to be removed.
Described voltage sample unit and control unit are identity element, and this element comprises voltage-stabiliser tube or reference voltage modulator.
Described voltage sample unit and control unit are discrete component, and described control unit comprises that a reference source adds comparator.
Described control switch is for producing the device of conducting and cut-off two states, and described control switch adopts triode or field effect transistor or mechanical switch.
Described dummy load body is that energy consumes main body, and the dummy load body adopts resistance or constant power source or constant-current source.
Voltage sample unit and control unit comprise diode D1 and current source CS, and the dummy load body adopts resistance R 1, and control switch adopts triode Q1;
The negative electrode of voltage stabilizing didoe D1 and output voltage V
0Connect,
SunThe utmost point is connected with current source CS; Dummy resistance R1 one end and defeated
Go out voltage V
0Connect, the other end is connected with the collector electrode of control switch triode Q1;
The grounded emitter of control switch triode Q1, base stage is connected with current source CS;
Voltage stabilizing didoe D1 is used for gathering output voltage and compares output voltage; Current source CS is used for driving control switch triode Q1; Work as output voltage V
0Surpass voltage stabilizing didoe D1 voltage Vz+Vbe
_ Q1The time, the driven conducting of control switch triode Q1, dummy resistance R1 is parallel to output voltage V
0On, dummy resistance R1 cut-in operation; Work as output voltage V
0Lower than voltage stabilizing didoe D1 voltage Vz+Vbe
_ Q1The time, control switch triode Q1 removes by, dummy resistance R1 is disconnected.Wherein, Vbe
_ Q1Base stage, the emitter saturation conduction voltage of Q1.
Voltage sample unit and control unit comprise voltage stabilizing didoe D1 and resistance R 2, and the dummy load body adopts resistance R 1, and control switch adopts triode Q1;
The negative electrode of voltage stabilizing didoe D1 and output voltage V
0Connect, anode is connected with resistance R 2; Dummy resistance R1 one end and output voltage V
0Connect, the other end is connected with the collector electrode of control switch triode Q1;
The grounded emitter of control switch triode Q1, base stage is connected with resistance R 2;
Voltage stabilizing didoe D1 is used for gathering output voltage and compares output voltage; Resistance R 2 is used for driving control switch triode Q1; Work as output voltage V
0Surpass voltage stabilizing didoe D1 voltage Vz+Vbe
_ Q1The time, the driven conducting of control switch triode Q1, dummy resistance R1 is parallel on output voltage V o, dummy resistance R1 cut-in operation; Work as output voltage V
0Lower than voltage stabilizing didoe D1 voltage Vz+Vbe
_ Q1The time, control switch triode Q1 cut-off, dummy resistance R1 is disconnected to be removed.Wherein, Vbe
_ Q1Base stage, the emitter saturation conduction voltage of Q1.
Voltage sample unit and control unit comprise voltage stabilizing didoe D1, PNP triode Q2 and resistance R 3, and the dummy load body adopts resistance R 1, and control switch adopts triode Q1;
The negative electrode of voltage stabilizing didoe D1 and output voltage V
0Connect, anode is connected with PNP triode Q2;
Resistance R 3 one ends are connected with PNP triode Q2 base stage; The other end is connected between voltage stabilizing didoe D1 anode and PNP triode Q2 emitter;
PNP triode Q2 collector electrode is connected with the base stage of control switch triode Q1, the Q1 grounded emitter;
Dummy resistance R1 one end and output voltage V
0Connect, the other end is connected with the collector electrode of control switch triode Q1;
Voltage stabilizing didoe D1 is used for gathering output voltage and compares output voltage; Work as output voltage V
0Surpass voltage stabilizing didoe D1 voltage Vz+Vbe
_ Q2+ Vbe
_ Q1, Vbe wherein
_ Q2Base stage, the emitter saturation conduction voltage of Q2,, PNP triode Q2 conducting, with Ic
Q2Drive control switch triode Q1 conducting, dummy resistance R1 is parallel to output voltage V
0On, dummy resistance R1 cut-in operation; Work as output voltage V
0Lower than voltage stabilizing didoe D1 voltage Vz+Vbe
_ Q2The time, control switch triode Q1 cut-off, dummy resistance R1 is disconnected to be removed;
The Ic of PNP triode Q2
Q2Size of current is
H wherein
FE_Q2It is the multiplication factor of triode Q2.
Control unit adopts and comprises that voltage reference modulator U1 and resistance R 4 dummy load bodies adopt resistance R 1, and control switch adopts triode Q3;
Voltage sample unit one end and output voltage V
0Connect, the other end is connected with the R pin of voltage reference modulator U1;
Resistance R 4 one ends and output voltage V
0Connect, the other end is connected with the K pin of voltage reference modulator U1;
The K pin of voltage reference modulator U1 is connected with the base stage of control switch triode Q3, and A pin ground connection;
Dummy resistance R1 one end and output voltage V
0Connect, the other end is connected with the emitter of control switch triode Q3;
The base stage of control switch triode Q3 is connected between resistance R 4 and voltage reference modulator U1;
The output voltage that gathers when the voltage sample unit is during higher than the reference voltage of voltage reference modulator U1, and K, the A pin of voltage reference modulator U1 are low resistive state, drive control switch triode Q3 conducting, and dummy resistance R1 is parallel to output voltage V
0On, dummy resistance R1 cut-in operation; The output voltage that gathers when the voltage sample unit is during lower than the reference voltage of voltage reference modulator U1, and K, the A pin of voltage reference modulator U1 are high-impedance state, control switch triode Q3 by, dummy resistance R1 is disconnected to be removed.
Beneficial effect: the advantage of maximum of the present invention is to use mode cheaply, realize dynamic load and disconnected the removing of output dummy load, in low-cost multiple-output electric power, do Voltage Feedback owing to only having a wherein road, other outputs rely on the coupling operate in open loop state with main output, easily cause output voltage under idle condition to raise, during heavy duty, output voltage reduces.The direct output in parallel of tradition dummy load, dummy load is always at loss of energy.And when the output channel output of not controlling was heavily loaded, output voltage may be on the low side, and the dummy load that always is connected in parallel on output can aggravate output voltage and reduce, deteriorated output performance.And the present invention proposes lower cost solution, can effectively reduce the dummy load loss, and, when output voltage is on the low side, automatically excise dummy load, objectively make the output voltage downward trend be alleviated.
According to statistics, 10% of national generating capacity by the stand-by power consumption of equipment, consumed at present, and this wherein, quite a few is to be consumed in the dummy load of low-cost power supply, such as television set top box power supply, computer power, printer power supply, be all the low-cost power supply of multichannel output, national and even global use amount is large, and the dummy load loss is surprising.And, due to the consideration of cost, can not use the too design of complex and expensive, in this programme, remove the dummy load body, the price of remainder can not surpass 0.1 yuan, in batches after price lower, suitable popularization in enormous quantities.
Description of drawings
Fig. 1 is structured flowchart of the present invention;
Fig. 2 is the circuit diagram of specific embodiment I;
Fig. 3 is the circuit diagram of specific embodiment II;
Fig. 4 is the circuit diagram of specific embodiment III;
Fig. 5 is the circuit diagram of specific embodiment IV.
Embodiment
The present invention is further detailed explanation below in conjunction with accompanying drawing.
As shown in Figure 1, a kind of dynamic dummy load simple in structure of the present invention, comprise the voltage sample unit, control unit, dummy load body and control switch.
The voltage sample unit gathers output voltage, by control unit comparison output voltage and threshold voltage and drive control switch conducting and by, if output voltage surpasses threshold voltage, the driven conducting of control switch, the dummy load body is parallel on output voltage, the cut-in operation of dummy load body; If output voltage is lower than threshold voltage, control switch ends, and the dummy load body is disconnected to be removed.
Described voltage sample unit, control unit can be identity elements, (as voltage-stabiliser tube or reference voltage modulator etc.); Can be also that discrete component is carried out, this moment, control unit can be that a reference source adds comparator.
Control switch refers to any device that can produce conducting and cut-off two states, includes but not limited to triode or field effect transistor or mechanical switch etc.
The dummy load body is that energy consumes main body, can be resistance or constant power source or constant-current source etc.
The embodiment I:
As shown in Figure 2, described a kind of dynamic dummy load simple in structure, comprise voltage stabilizing didoe D1, control switch triode Q1, current source CS, dummy resistance R1.
The negative electrode of voltage stabilizing didoe D1 and output voltage V
0Connect, anode is connected with current source CS; Dummy resistance R1 one end and output voltage V
0Connect, the other end is connected with the collector electrode of control switch triode Q1; The grounded emitter of control switch triode Q1, base stage is connected with current source CS;
Voltage stabilizing didoe D1 is used for gathering output voltage and compares output voltage; Current source CS is used for driving control switch triode Q1; Work as output voltage V
0Surpass voltage stabilizing didoe D1 voltage Vz+Vbe
_ Q1The time, the driven conducting of control switch triode Q1, dummy resistance R1 is parallel to output voltage V
0On, dummy resistance R1 cut-in operation; Work as output voltage V
0Lower than voltage stabilizing didoe D1 voltage Vz+Vbe
_ Q1The time, control switch triode Q1 removes by, dummy resistance R1 is disconnected.Wherein, Vbe
_ Q1Base stage, the emitter saturation conduction voltage of Q1.
CS is drive current source, and various ways can be arranged, and includes but not limited to: resistance, current source.
The embodiment II:
As shown in Figure 3, current source CS consists of a resistance R 2.Described a kind of dynamic dummy load simple in structure, comprise voltage stabilizing didoe D1, control switch triode Q1, resistance R 2, dummy resistance R1.
The negative electrode of voltage stabilizing didoe D1 and output voltage V
0Connect, anode is connected with resistance R 2; Dummy resistance R1 one end and output
Voltage V
0Connect, the other end is connected with the collector electrode of control switch triode Q1;
The grounded emitter of control switch triode Q1, base stage is connected with resistance R 2;
Voltage stabilizing didoe D1 is used for gathering output voltage and compares output voltage; Resistance R 2 is used for driving control switch triode Q1; Work as output voltage V
0Surpass voltage stabilizing didoe D1 voltage Vz+Vbe
_ Q1The time, the driven conducting of control switch triode Q1, dummy resistance R1 is parallel to output voltage V
0On, dummy resistance R1 cut-in operation; Work as output voltage V
0Lower than voltage stabilizing didoe D1 voltage Vz+Vbe
_ Q1The time, control switch triode Q1 cut-off, dummy resistance R1 is disconnected to be removed.Wherein, Vbe
_ Q1Base stage, the emitter saturation conduction voltage of Q1.
The embodiment III
As shown in Figure 4, current source SC consists of a PNP triode Q2 and resistance R 3,
The Ic of PNP triode Q2
Q2Size of current is
H wherein
FE_Q2It is the multiplication factor of triode Q2.
Described a kind of dynamic dummy load simple in structure, comprise voltage stabilizing didoe D1, control switch triode Q1, PNP triode Q2, resistance R 3, dummy resistance R1.
The negative electrode of voltage stabilizing didoe D1 and output voltage V
0Connect, anode is connected with PNP triode Q2;
Resistance R 3 one ends are connected with PNP triode Q2 base stage; The other end is connected between voltage stabilizing didoe D1 anode and PNP triode Q2 emitter;
PNP triode Q2 collector electrode is connected with the base stage of control switch triode Q1, the Q1 grounded emitter;
Dummy resistance R1 one end and output voltage V
0Connect, the other end is connected with the collector electrode of control switch triode Q1;
Voltage stabilizing didoe D1 is used for gathering output voltage and compares output voltage; Work as output voltage V
0Surpass voltage stabilizing didoe D1 voltage Vz+Vbe
_ Q2+ Vbe
_ Q1, Vbe wherein
_ Q2Be base stage, the emitter saturation conduction voltage of Q2, PNP triode Q2 conducting, with Ic
Q2Drive control switch triode Q1 conducting, dummy resistance R1 is parallel to output voltage V
0On, dummy resistance R1 cut-in operation; Work as output voltage V
0Lower than voltage stabilizing didoe D1 voltage Vz+Vbe
_ Q2The time, control switch triode Q1 cut-off, dummy resistance R1 is disconnected to be removed;
The embodiment IV
Adopt the voltage reference modulator more accurately according to the output voltage switching, to control dummy load.The voltage reference device has three pins, is respectively K, A, R.Voltage when between A, R surpasses benchmark, is low resistive state between K, A; Voltage, lower than benchmark, is great-great-grandfather's state between K, A between A, R.Utilize voltage reference and the comparing function of this element, can simply realize a Dynamic High-accuracy dummy load.
As shown in Figure 5, described a kind of dynamic dummy load simple in structure, comprise the voltage sample unit, resistance R 4, dummy resistance R1, voltage reference modulator U1, control switch triode Q3.
Voltage sample unit one end and output voltage V
0Connect, the other end is connected with the R pin of voltage reference modulator U1;
Resistance R 4 one ends and output voltage V
0Connect, the other end is connected with the K pin of voltage reference modulator U1;
The K pin of voltage reference modulator U1 is connected with the base stage of control switch triode Q3, and A pin ground connection;
Dummy resistance R1 one end and output voltage V
0Connect, the other end is connected with the emitter of control switch triode Q3;
The base stage of control switch triode Q3 is connected between resistance R 4 and voltage reference modulator U1.
The output voltage that gathers when the voltage sample unit is during higher than the reference voltage of voltage reference modulator U1, and K, the A pin of voltage reference modulator U1 are low resistive state, drive control switch triode Q3 conducting, and dummy resistance R1 is parallel to output voltage V
0On, dummy resistance R1 cut-in operation.The output voltage that gathers when the voltage sample unit is during lower than the reference voltage of voltage reference modulator U1, and K, the A pin of voltage reference modulator U1 are high-impedance state, control switch triode Q3 by, dummy resistance R1 is disconnected to be removed.
Claims (9)
1. dynamic dummy load simple in structure is characterized in that: comprise the voltage sample unit, control unit, dummy load body and control switch;
The voltage sample unit gathers output voltage, by control unit comparison output voltage and threshold voltage and drive control switch conducting and by, if output voltage surpasses threshold voltage, the driven conducting of control switch, the dummy load body is parallel on output voltage, the cut-in operation of dummy load body; If output voltage is lower than threshold voltage, control switch ends, and the dummy load body is disconnected to be removed.
2. a kind of dynamic dummy load simple in structure according to claim 1, it is characterized in that: described voltage sample unit and control unit are identity element, this element comprises voltage-stabiliser tube or reference voltage modulator.
3. a kind of dynamic dummy load simple in structure according to claim 1, it is characterized in that: described voltage sample unit and control unit are discrete component, and described control unit comprises that a reference source adds comparator.
4. a kind of dynamic dummy load simple in structure according to claim 1 is characterized in that: described control switch is for producing the device of conducting and cut-off two states, and described control switch adopts triode or field effect transistor or mechanical switch.
5. a kind of dynamic dummy load simple in structure according to claim 1 is characterized in that: described dummy load body is that energy consumes main body, and the dummy load body adopts resistance or constant power source or constant-current source.
6. 2,4, the 5 described a kind of dynamic dummy loads simple in structure of any one according to claim 1,, it is characterized in that: voltage sample unit and control unit comprise diode D1 and current source CS, the dummy load body adopts resistance R 1, and control switch adopts triode Q1;
The negative electrode of voltage stabilizing didoe D1 and output voltage V
0Connect,
SunThe utmost point is connected with current source CS; Dummy resistance R1 one end and output voltage V
0Connect, the other end is connected with the collector electrode of control switch triode Q1;
The grounded emitter of control switch triode Q1, base stage is connected with current source CS;
Voltage stabilizing didoe D1 is used for gathering output voltage and compares output voltage; Current source CS is used for driving control switch triode Q1; Work as output voltage V
0Surpass voltage stabilizing didoe D1 voltage Vz+Vbe
_ Q1The time, the driven conducting of control switch triode Q1, dummy resistance R1 is parallel to output voltage V
0On, dummy resistance R1 cut-in operation; Work as output voltage V
0Lower than voltage stabilizing didoe D1 voltage Vz+Vbe
_ Q1The time, control switch triode Q1 removes by, dummy resistance R1 is disconnected.Wherein, Vbe
_ Q1Base stage, the emitter saturation conduction voltage of Q1.
7. 2,4, the 5 described a kind of dynamic dummy loads simple in structure of any one according to claim 1,, it is characterized in that: voltage sample unit and control unit comprise voltage stabilizing didoe D1 and resistance R 2, the dummy load body adopts resistance R 1, and control switch adopts triode Q1;
The negative electrode of voltage stabilizing didoe D1 and output voltage V
0Connect, anode is connected with resistance R 2; Dummy resistance R1 one end and output voltage V
0Connect, the other end is connected with the collector electrode of control switch triode Q1;
The grounded emitter of control switch triode Q1, base stage is connected with resistance R 2;
Voltage stabilizing didoe D1 is used for gathering output voltage and compares output voltage; Resistance R 2 is used for driving control switch triode Q1; Work as output voltage V
0Surpass voltage stabilizing didoe D1 voltage Vz+Vbe
_ Q1The time, the driven conducting of control switch triode Q1, dummy resistance R1 is parallel on output voltage V o, dummy resistance R1 cut-in operation; Work as output voltage V
0Lower than voltage stabilizing didoe D1 voltage Vz+Vbe
_ Q1The time, control switch triode Q1 cut-off, dummy resistance R1 is disconnected to be removed.Wherein, Vbe
_ Q1Base stage, the emitter saturation conduction voltage of Q1.
8. 2,4, the 5 described a kind of dynamic dummy loads simple in structure of any one according to claim 1,, it is characterized in that: voltage sample unit and control unit comprise voltage stabilizing didoe D1, PNP triode Q2 and resistance R 3, the dummy load body adopts resistance R 1, and control switch adopts triode Q1;
The negative electrode of voltage stabilizing didoe D1 and output voltage V
0Connect, anode is connected with PNP triode Q2;
Resistance R 3 one ends are connected with PNP triode Q2 base stage; The other end is connected between voltage stabilizing didoe D1 anode and PNP triode Q2 emitter;
PNP triode Q2 collector electrode is connected with the base stage of control switch triode Q1, the Q1 grounded emitter;
Dummy resistance R1 one end and output voltage V
0Connect, the other end is connected with the collector electrode of control switch triode Q1;
Voltage stabilizing didoe D1 is used for gathering output voltage and compares output voltage; Work as output voltage V
0Surpass voltage stabilizing didoe D1 voltage Vz+Vbe
_ Q2+ Vbe
_ Q1, Vbe wherein
_ Q2Base stage, the emitter saturation conduction voltage of Q2,, PNP triode Q2 conducting, with Ic
Q2Drive control switch triode Q1 conducting, dummy resistance R1 is parallel to output voltage V
0On, dummy resistance R1 cut-in operation; Work as output voltage V
0Lower than voltage stabilizing didoe D1 voltage Vz+Vbe
_ Q2The time, control switch triode Q1 cut-off, dummy resistance R1 is disconnected to be removed;
The Ic of PNP triode Q2
Q2Size of current is
H wherein
FE_Q2It is the multiplication factor of triode Q2.
9. according to claim 1,3,4, the 5 described a kind of dynamic dummy loads simple in structure of any one, it is characterized in that: control unit adopts and to comprise that voltage reference modulator U1 and resistance R 4 dummy load bodies adopt resistance R 1, and control switch adopts triode Q3;
Voltage sample unit one end and output voltage V
0Connect, the other end is connected with the R pin of voltage reference modulator U1;
Resistance R 4 one ends and output voltage V
0Connect, the other end is connected with the K pin of voltage reference modulator U1;
The K pin of voltage reference modulator U1 is connected with the base stage of control switch triode Q3, and A pin ground connection;
Dummy resistance R1 one end and output voltage V
0Connect, the other end is connected with the emitter of control switch triode Q3;
The base stage of control switch triode Q3 is connected between resistance R 4 and voltage reference modulator U1;
The output voltage that gathers when the voltage sample unit is during higher than the reference voltage of voltage reference modulator U1, and K, the A pin of voltage reference modulator U1 are low resistive state, drive control switch triode Q3 conducting, and dummy resistance R1 is parallel to output voltage V
0On, dummy resistance R1 cut-in operation; The output voltage that gathers when the voltage sample unit is during lower than the reference voltage of voltage reference modulator U1, and K, the A pin of voltage reference modulator U1 are high-impedance state, control switch triode Q3 by, dummy resistance R1 is disconnected to be removed.
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Cited By (6)
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| CN104300773A (en) * | 2014-10-17 | 2015-01-21 | 深圳航天科技创新研究院 | Simple self-adaptation dummy-load circuit |
| CN106602857A (en) * | 2016-12-26 | 2017-04-26 | 科世达（上海）管理有限公司 | Self-adaptive dummy load circuit and switching power supply |
| CN107591859A (en) * | 2017-09-22 | 2018-01-16 | 中惠创智无线供电技术有限公司 | A kind of wireless charging receives controller guard method and device |
| CN109710011A (en) * | 2018-12-29 | 2019-05-03 | 普联技术有限公司 | A kind of low-power consumption dummy load circuit |
| CN112769316A (en) * | 2020-12-31 | 2021-05-07 | 广东美的制冷设备有限公司 | Voltage adjusting system and method of switching power supply and power supply system |
| CN115085336A (en) * | 2022-07-22 | 2022-09-20 | 深圳市创芯微微电子有限公司 | Dynamic load circuit for charging equipment, dynamic load adjusting method and charging equipment |
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| CN106602857A (en) * | 2016-12-26 | 2017-04-26 | 科世达（上海）管理有限公司 | Self-adaptive dummy load circuit and switching power supply |
| CN107591859A (en) * | 2017-09-22 | 2018-01-16 | 中惠创智无线供电技术有限公司 | A kind of wireless charging receives controller guard method and device |
| CN109710011A (en) * | 2018-12-29 | 2019-05-03 | 普联技术有限公司 | A kind of low-power consumption dummy load circuit |
| CN112769316A (en) * | 2020-12-31 | 2021-05-07 | 广东美的制冷设备有限公司 | Voltage adjusting system and method of switching power supply and power supply system |
| CN115085336A (en) * | 2022-07-22 | 2022-09-20 | 深圳市创芯微微电子有限公司 | Dynamic load circuit for charging equipment, dynamic load adjusting method and charging equipment |
| CN115085336B (en) * | 2022-07-22 | 2022-12-06 | 深圳市创芯微微电子有限公司 | Dynamic load circuit for charging equipment, dynamic load adjusting method and charging equipment |
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Application publication date: 20131120 |