CN103841687A - Inverter controller and driving circuit - Google Patents
Inverter controller and driving circuit Download PDFInfo
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- CN103841687A CN103841687A CN201210469967.5A CN201210469967A CN103841687A CN 103841687 A CN103841687 A CN 103841687A CN 201210469967 A CN201210469967 A CN 201210469967A CN 103841687 A CN103841687 A CN 103841687A
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Abstract
Provided are an inverter controller and a driving circuit. The driving circuit, which drives a plurality of loads, includes a switch circuit, a first transformer, a current induction circuit and the inverter controller. The switch circuit is used for converting DC electrical energy into first AC electrical energy. A primary winding of the first transformer is coupled to the switch circuit and used for receiving the first AC electrical energy. A first secondary winding of the first transformer induces the first AC electrical energy so as to output second AC electrical energy to the plurality of loads. The current induction circuit is coupled to at least one load in the plurality of loads and used for generating feedback current signals representing the currents of the plurality of loads. The inverter controller includes a pulse-width modulation generator, a switch driving circuit, a current regulating circuit for receiving the feedback current signals and a mode controller for receiving external dimming control signals. The plurality of circuit modules of the inverter controller of the driving circuit can share the same pin so that the number of elements and pins is reduced.
Description
Technical field
The invention relates to drive circuit, more particularly about drive circuit and the circuit control device of driving light source.
Background technology
Liquid crystal display (liquid crystal display, LCD) panel application is in various fields, comprise portable electric appts and unit, fixed position, for example: notebook computer, video frequency pick-up head, mobile phone, palmtop PC, game machine, medical equipment, movable positioning system and industrial machine etc.In the application of LCD, be backlightly often used to illuminate panel.For example, LCD is backlight is usually used in the brightness that provides higher, longer life-span and better consistency.LCD backlight can comprise electroluminescent lamp (electroluminescent lamp, EL), light-emitting diode (light emitting diode, LED), cold-cathode fluorescence lamp (cold cathode fluorescent lamp, CCFL), flat fluorescent lamp (flat fluorescent lamp, FFL), external electrode fluorescent lamp (External Electrode Fluorescent Lamp, EEFL) hot-cathode fluorescent lamp (hotcathode fluorescent lamp, and CNT (carbon nano-tube) (carbon nano tube HCFL), CNT).
The CCFL demonstration that is usually used in image and color backlight, and can well be applicable to the LCD panel of big-and-middle size.And CCFL can be used as the light source of LCD panel, can comprise the phosphor coating glass infuser with two cathode terminals.In addition, for example,, along with the growth to the larger sized demand of LCD panel (: LCD TV or large-scale LCD monitor), back light system can move multiple CCFL so that required brightness to be provided.
High-voltage direct-current/a-c transducer (claiming again inverter) is often used to drive CCFL.Most CCFL AC/DC converter can form rearrangeable switch circuit, for generation of the output AC electric energy with specific voltage and frequency.For example, a typical CCFL inverter need to be exported the alternating current of about 20～80KHZ, and working voltage is about 400～800V root mean square (root mean square, RMS).Circuit control device circuit can comprise voltage and/or current feedback and brightness adjustment control.But the integrated circuit circuit control device of prior art needs relatively many elements.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of and drives the drive circuit of multiple loads and control the circuit control device of the energy of supply load, in order to reduce the component number of integrated circuit circuit control device.
For solving the problems of the technologies described above, the invention provides a kind ofly for driving the drive circuit of multiple loads, it comprises switching circuit, the first transformer, current-sensing circuit and circuit control device.Switching circuit is for converting direct current energy to first AC energy.The first transformer comprises armature winding and the first secondary winding, wherein, armature winding is coupled in this switching circuit, and this armature winding is used for receiving the first AC energy also to the first secondary winding energy supply, to produce the second AC energy to the plurality of load energy supply on the first secondary winding.Current-sensing circuit is coupled at least one load in the plurality of load, for generation of the feedback current signal that represents the electric current that flows through multiple loads.Circuit control device is used for receiving external dimmer control signal and described feedback current signal, and control switch circuit.This circuit control device comprises: pulse-width modulation maker, switch driving circuit, current regulating circuit and mode controller.Pulse-width modulation maker is for generation of burst mode pulse-width signal.The described burst mode pulse-width signal control switch circuit of switch driving circuit for producing according to described pulse-width modulation maker.Current regulating circuit is used for receiving described feedback current signal.Mode controller is used for receiving external dimmer control signal, in the time that described external dimmer control signal is effective, described mode controller operates under trigger mode or normal operation mode described circuit control device, described switch driving circuit is transferred to described first AC energy of described armature winding with adjusting according to switching circuit described in the control of described burst mode pulse-width signal, when described external dimmer control signal invalid or lasting during in miss status in the default time period, described mode controller makes described circuit control device close or operate under idle mode, by switch driving circuit stopcock circuit.
The present invention also provides a kind of control to offer the circuit control device of the energy of load, and it comprises: voltage compensating circuit, current regulating circuit, pulse-width modulation maker, switch driving circuit and mode controller.Voltage compensating circuit is for receiving the induced signal that represents input direct voltage value, and generation is inversely proportional to the output signal of this induced signal.Current regulating circuit is for receiving induced signal and the feedback signal of load current of the described load that represents to flow through, the size of more described feedback signal and predetermined threshold value, and produce error signal by the size of more described feedback signal and load control signal.Pulse-width modulation maker is connected with described voltage compensating circuit and described current regulating circuit, for in the time that feedback signal is less than described predetermined threshold value, produce pulse-width signal according to described output signal, and in the time that described feedback signal is greater than described predetermined threshold value, produce described pulse-width signal according to described error signal.Switch driving circuit is used for receiving pulse-width signal, and generates the driving signal for controlling the energy that sends described load to.Mode controller receives dimming control signal, when described dimming control signal is invalid or lasting during in miss status in the default time period, closes described switch driving circuit.
Compared with prior art, drive circuit of the present invention can be operated in trigger mode, normal operation mode and idle mode, and multiple circuit modules of circuit control device of the present invention can share one lead, thus improve operating efficiency, reduce element and number of pins.
Below in conjunction with the drawings and specific embodiments, technical scheme of the present invention is described in detail, so that characteristic of the present invention and advantage are more obvious.
Brief description of the drawings
Figure 1 shows that the structured flowchart of drive circuit according to an embodiment of the invention.
Figure 2 shows that the structured flowchart of circuit control device according to an embodiment of the invention.
Embodiment
To embodiments of the invention be provided to detailed explanation below.Although the present invention sets forth and illustrates in connection with some embodiments, it should be noted that the present invention is not merely confined to these execution modes.On the contrary, the amendment that the present invention is carried out or be equal to replacement, all should be encompassed in the middle of claim scope of the present invention.
In addition, for better explanation the present invention, in embodiment below, provided numerous details.It will be understood by those skilled in the art that and there is no these details, the present invention can implement equally.In other example, method, flow process, element and the circuit known for everybody are not described in detail, so that highlight purport of the present invention.
Figure 1 shows that the structured flowchart of drive circuit 100 according to an embodiment of the invention.Drive circuit 100 for example, for driving one or more loads: cold-cathode fluorescence lamp (cold cathode fluorescent lamp, CCFL) 102,104,106 and 108.Drive circuit 100 comprises and is coupled in external dc power, for example, battery 112, switching circuit 110.In one embodiment, switching circuit 10 is as AC/DC converter or inverter, for the direct current energy obtaining from battery 112 is converted to the first AC energy.
In another embodiment, drive circuit 100 can comprise two or more transformers of iron core separately that have.The armature winding of transformer is connected mutually, and the electric current that flows through like this CCFL just can obtain equilibrium.In another embodiment, other structures, for example, balancing control circuit, can be used for balanced flow and crosses the electric current of CCFL.
In the embodiment shown in fig. 1, drive circuit comprises lamp open detection circuit, and this testing circuit comprises that lamp open circuit detects resistance 142.As shown in Figure 1, CCFL 104 and 108 is coupled in respectively the polar end of secondary winding 136 and 124, and CCFL 102 and 106 is coupled in respectively the non-polar end of secondary winding 136 and 124.One end that lamp open circuit detects resistance 142 is coupled in CCFL 104 and 106, and the other end is coupled in ground.In one embodiment, in the time of normal operation, because CCFL104 and CCFL 106 are coupled in respectively the polar end of secondary winding 136 and the non-polar end of secondary winding 124, the electric current of CCFL 104 and CCFL 106 of flowing through has identical root mean square (root moan square, RMS) value, but single spin-echo.Therefore,, in the time of normal operation, the electric current that flowing through lamps open circuit detects resistance 142 equals zero.
In one embodiment, if a CCFL in CCFL 102,104,106 and 108, in lamp open-circuit condition, can rise just lamp open circuit detects the voltage of resistance 142.For example, the current reduction of CCFL 102 and the 104 but electric current of the CCFL 106 and 108 that flows through is constant if CCFL102, in lamp open-circuit condition, flows through.As a result, at CCFL 102, during in lamp open-circuit condition, the voltage that lamp open circuit detects resistance 142 rises.Rise once lamp open circuit detects the voltage of resistance 142, circuit control device 200 can receive by diode 144 voltage signal of lamp open circuit detection electricity group 142.This voltage signal can be used for judging whether lamp open-circuit condition occurs.In one embodiment, if lamp open-circuit condition detected, circuit control device 200 can be closed.
In another embodiment, CCFL 104 and 106 is not coupled in ground.CCFL102, secondary winding 136, CCFL104, CCFL 106, secondary winding 124 and CCFL 108 be series connection mutually successively. Secondary winding 124 and 136 can be responded to the CCFL 102,104 that flows through successively, 106 and 108 electric current, or respond to the CCFL 108,106 that flows through successively, 104 and 102 electric current.In this embodiment, can remove lamp open circuit and detect resistance 142.The CCFL 102,104 that flows through, 106 and 108 electric current can further obtain equilibrium.
In order to light CCFL 102,104,109 and 108, need to provide and there is high voltage and high-frequency alternating current.For example, light CCFL 102,104, the root-mean-square value of 106 and 108 starting resistor need to exceed 1000 volts, and CCFL 102,104 after starting, the root-mean-square value of the working voltage under 106 and 108 normal work is at 400～800 volts, and frequency is at 20～80KHZ.
In one embodiment, the first alternating current that switching circuit 110 is exported is a relatively little magnitude of voltage.Transformer 120 is for first alternating current that boosts, and the second higher alternating current of output voltage values.Be proportional to the voltage of secondary winding 124 secondary winding 124 and the turn ratio of armature winding 122 are multiplied by voltage long-pending of armature winding 122, voltage long-pending that the voltage of secondary winding 136 is proportional to secondary winding 136 and the turn ratio of armature winding 128 and is multiplied by armature winding 128. Secondary winding 124 and 136 is coupled in CCFL 102,104, and 106 and 108 provide electric energy to CCFL 102,104,106 and 108.
In one embodiment, external dimmer control signal 180, for example, pulse-width modulation (pulse widthmodulation, PWM) signal, is input to circuit control device 200.External dimmer control signal 180 can be used for regulating CCFL102,104,106 and 108 brightness.In one embodiment, drive circuit 100 can be operated in trigger mode, normal operation mode and idle mode.In one embodiment, in the time that external dimmer control signal 180 is effective and circuit control device 200 senses external dimmer control signal 180, first drive circuit 100 is operated in trigger mode.Now, circuit control device 200 control switch circuit 110 transmit the first alternating current to armature winding 122 and 128, to light CCFL 102,104,106 and 108.As CCFL 102,104,106 and 108 be all lit after, drive circuit 100 can be operated in normal operation mode.In one embodiment, if the induced signal that current-sensing circuit 140 produces is greater than predetermined current value, drive circuit 100 can begin operating in normal operation mode.Now, circuit control device 200 control switch circuit 110 regulate CCFL 102,104,106 and 108 brightness.When external dimmer control signal 180 lost efficacy and circuit control device 200 cannot sense external dimmer control signal 180, drive circuit 100 can be operated in idle mode.Now, circuit control device 200 can stopcock circuit 110, and CCFL 102,104,106 and 108 will not be lit.
In one embodiment, drive circuit 100 comprises the voltage sense circuit 130 that contains two resistance 132 and 134. Resistance 132 and 134 is mutually connected and is formed voltage divider 130, supplies with the voltage signal of the magnitude of voltage of the DC power supply 112 of circuit control device 200 for generation of expression.
Figure 2 shows that the structured flowchart of circuit control device 200 according to an embodiment of the invention.Circuit control device 200 is described in connection with the drive circuit 100 of Fig. 1.Circuit control device 200 can be the integrated antenna package that contains 8 pins, comprises pin 272,274, and 276,278,280,282,284 and 286. Pin 272 and 274 is coupled in respectively voltage source and ground.
In one embodiment, circuit control device 200 comprises mode controller 210, voltage compensating circuit 250, lamp current regulating circuit 240, switch driving circuit 230, open lamp protection circuit 260, oscillator 220 and with reference to biasing circuit 202.With reference to biasing circuit 202 for generation of internal reference voltage each element to circuit control device 200.
In one embodiment, voltage compensating circuit 250 is coupled in pin 278, and this pin 278 is for receiving compensation (induction) signal from voltage sense circuit 130.Voltage compensating circuit 250 comprises operational amplifier 252 and resistance 254 and 256, to form inverting amplifier.In one embodiment, the magnitude of voltage of the output signal of voltage compensating circuit 250 is inversely proportional to compensation (induction) signal of pin 278.For example, when the voltage of the compensating signal receiving when pin 278 increases, the magnitude of voltage of the output signal of voltage compensating circuit 250 reduces.
In one embodiment, lamp current regulating circuit 240 is coupled in pin 280, for receiving the feedback current induced signal from current-sensing circuit 140.Lamp current regulating circuit 240 comprises error amplifier 242, comparator 244 and latch 248.Comparator 244 is lighted the size of the feedback current induced signal of threshold current value 246 and pin 280 for relatively more default lamp.
In the time providing electric energy dimming control signal 180 to be detected to pin 272 and on pin 276, to light threshold and plant current value 246 if the feedback current induced signal on pin 280 is less than default lamp, circuit control device 200 is operated in trigger mode.In trigger mode, Closing Switch 232 and 234, cut-off switch 236 and 238.The input of voltage compensating circuit 250 and output are coupled in respectively pin 278 and comparator 224.Lamp current regulating circuit 240 disconnects with switch driving circuit 230.The magnitude of voltage of the compensating signal that the magnitude of voltage of the output signal of voltage compensating circuit 250 and pin 278 receive is inversely proportional to.The output voltage of voltage compensating circuit 250 and ramp signal 222 are sent to comparator 224, and can be limited in approaching a relatively narrow interval of trigger voltage from the voltage of transformer 120.This trigger voltage can be by suitably arranging reference signal COMP_REF and suitably selecting resistance 254 and 256 to set in advance.
Once CCFL is lit, and the current sensing signal of pin 280 is when being greater than default lamp and lighting threshold current value 246, and it is effective that latch 248 makes lamp light signal 270.This lamp is lighted signal 270 can cut-off switch 232 and 234, and Closing Switch 236 and 238.Now, circuit control device 200 is operated in normal operation mode.The normal phase input end of comparator 224 is coupled in the output of pin 278 and error amplifier 242.Voltage compensating circuit 250 disconnects with switch driving circuit 230.Error amplifier 242 can compare the size of current sensing signal and the reference signal MAX_BRIGHT of pin 280.This reference signal MAX_BRIGHT represents CCFL102,104,106 and 108 brightness that expect or maximum.The voltage induced signal that the output of error amplifier 242 and pin 278 receive is sent to comparator 224 by switch 236.Voltage induced signal deciding or control that the duty ratio of the burst mode pwm signal that comparator 224 is exported can be received by the output of error amplifier 242 and pin 278.In normal operation mode, having realized closed-loop lamp electric current regulates.Advantage is, voltage compensating circuit 250 and current regulating circuit 240 all receive the voltage induced signal of pin 278, and shares same pin 278.Therefore reduced the pin sum of circuit control device 200.
Therefore,, in the time that the feedback current induced signal of pin 280 is less than default lamp and lights threshold current value 246, circuit control device 200 can be operated in trigger mode.In one embodiment, under trigger mode, voltage compensating circuit 250 is coupled in switch driving circuit 230, and lamp current regulating circuit 240 disconnects with switch driving circuit 230.Under trigger mode, PWM maker, for example, comparator 224, generates burst mode pwm signal according to the output signal of voltage compensating circuit 250.In particular, the output signal of comparator 224 comparative voltage compensating circuits 250 and ramp signal 222, to control the duty ratio of burst mode pwm signal.
In the time that the feedback current induced signal of pin 280 is greater than default lamp and lights threshold current value 246, circuit control device 200 can be operated in normal operation mode.In one embodiment, under normal operation mode, voltage compensating circuit 250 disconnects with switch driving circuit 230, and lamp current regulating circuit 240 is coupled in switch driving circuit 230.Under normal operation mode, PWM maker, for example, comparator 224, generates burst mode pwm signal according to the error signal of error amplifier 242.In particular, the error signal of comparator 224 relative error amplifiers 242 and ramp signal 222, to control the duty ratio of burst mode pwm signal.Therefore, can recently regulate CCFL 102,104,106 and 108 brightness by the duty that regulates burst mode pwm signal.
In one embodiment, open lamp protection circuit 260 detects the voltage signal of resistance 142 by pin 276 receiving light open circuits.Open lamp protection circuit 260 comprises comparator 262, delay timer 264 and shut-off circuit 266.Comparator 262 detects the voltage signal of resistance 142 by pin 276 receiving lights open circuits, and the size of this voltage signal and interior lamp open circuit threshold value relatively.If the voltage signal of pin 276 is greater than interior lamp open circuit threshold value, delay timer 264 is activated or starts to calculate turn-off delay time.In the time that delay timer 264 timing finish, circuit control device 200 is closed.Be less than interior lamp open circuit threshold value when the voltage signal of pin 276 drops to before timer 264 finishes timing, circuit control device 200 can continue to operate in normal operation mode.
Advantage is, in one embodiment, if the external dimmer control signal 180 of pin 276 is invalid or in miss status, circuit control device 200 can close to be operated in idle mode automatically in one section of Preset Time.In circuit control device 200, voltage compensating circuit 250 and lamp current regulating circuit 240 can share one lead 278, and can be controlled at respectively electric energy loaded under trigger mode and normal operation mode.
The present invention is not limited to power supply to CCFL.Circuit control device 200 of the present invention also can be used for the light source of the load that drives other, for example: metal halide or sodium lamp.For example, circuit control device 200 also can be adjusted to and be operated in a frequency range to support to drive the load of x ray tube or other higher frequencies.
Above embodiment and accompanying drawing are only the present invention's conventional embodiment.Obviously, under the prerequisite that does not depart from the present invention's spirit that claims define and invention scope, can there be various supplements, amendment and replacement.It should be appreciated by those skilled in the art that the present invention can change to some extent in form, structure, layout, ratio, material, element, assembly and other side according to concrete environment and job requirement in actual applications under the prerequisite that does not deviate from invention criterion.Therefore, be only illustrative rather than definitive thereof at the embodiment of this disclosure, the present invention's scope is defined by appended claim and legal equivalents thereof, and is not limited to description before this.
Claims (10)
1. for driving a drive circuit for multiple loads, it is characterized in that, comprising:
Switching circuit, for converting direct current energy to the first AC energy;
The first transformer, this first transformer comprises armature winding and the first secondary winding, wherein said armature winding is coupled in described switching circuit, described armature winding is used for receiving described the first AC energy also to described the first secondary winding energy supply, to produce the second AC energy to described multiple load energy supplies on described the first secondary winding;
Be coupled in the current-sensing circuit of at least one load in described multiple load, for generation of the feedback current signal that represents the electric current that flows through described multiple loads; And
Circuit control device, for receiving external dimmer control signal and described feedback current signal, and controls described switching circuit, and described circuit control device comprises:
Pulse-width modulation maker, for generation of burst mode pulse-width signal;
Switch driving circuit, for switching circuit described in the described burst mode pulse-width signal control producing according to described pulse-width modulation maker;
Current regulating circuit, for receiving described feedback current signal; And
Mode controller, be used for receiving external dimmer control signal, in the time that described external dimmer control signal is effective, described mode controller operates under triggering or normal operation mode described circuit control device, described switch driving circuit is transferred to described first AC energy of described armature winding with adjusting according to switching circuit described in the control of described burst mode pulse-width signal, when described external dimmer control signal invalid or lasting during in miss status in the default time period, described mode controller makes described circuit control device close or operate under idle mode, turn-off described switching circuit by described switch driving circuit.
2. drive circuit according to claim 1, it is characterized in that, described current regulating circuit is also for the size of more described feedback current signal and predetermined threshold value current value, and produce error signal by the size of more described feedback current signal and load control signal, and in the time that described feedback current signal is greater than described predetermined threshold value current value, described pulse-width modulation maker produces described burst mode pulse-width signal according to described error signal.
3. drive circuit according to claim 1, is characterized in that, described drive circuit also comprises:
Be coupled in the load open circuit testing circuit of described multiple loads, for detection of load open circuit state; And
Load open circuit protection circuit, for closing described circuit control device in the time that described load open circuit testing circuit detects load open circuit state.
4. drive circuit according to claim 1, is characterized in that, described drive circuit also comprises:
The second transformer, comprises the armature winding that is coupled in described switching circuit, for receiving described the first AC energy, also comprises secondary winding, for giving described multiple load energy supplies.
5. drive circuit according to claim 1, is characterized in that, described multiple loads comprise multiple cold-cathode fluorescence lamps.
6. control offers a circuit control device for the energy of load, it is characterized in that, comprising:
Voltage compensating circuit, for receiving the induced signal that represents input direct voltage value, and produces the output signal that is inversely proportional to described induced signal;
Current regulating circuit, for receiving described induced signal and the feedback signal of load current of the described load that represents to flow through, the size of more described feedback signal and predetermined threshold value, and produce error signal by the size of more described feedback signal and load control signal;
Pulse-width modulation maker, be connected with described voltage compensating circuit and described current regulating circuit, for in the time that described feedback signal is less than described predetermined threshold value, produce pulse-width signal according to described output signal, and in the time that described feedback signal is greater than described predetermined threshold value, produce described pulse-width signal according to described error signal;
Switch driving circuit, for receiving described pulse-width signal, and generates the driving signal for controlling the energy that sends described load to; And
Mode controller, for receiving dimming control signal, when described dimming control signal is invalid or lasting during in miss status in the default time period, closes described switch driving circuit.
7. circuit control device according to claim 6, it is characterized in that, described pulse-width modulation maker comprises comparator, for in the time that described feedback signal is less than described predetermined threshold value, the size of more described output signal and ramp signal, and in the time that described feedback signal is greater than described predetermined threshold value, the size of more described error signal and described ramp signal.
8. circuit control device according to claim 6, is characterized in that, described circuit control device also comprises:
Load open circuit protection circuit, for closing described circuit control device in the time described load being detected in open-circuit condition.
9. circuit control device according to claim 6, is characterized in that,
In the time that described feedback signal is greater than described predetermined threshold value, disconnects the link of described voltage compensating circuit and described pulse-width modulation maker, thereby disconnect the connection of described voltage compensating circuit and described switch driving circuit.
10. circuit control device according to claim 6, is characterized in that,
In the time that described feedback signal is less than described predetermined threshold value, disconnects the connection of described current regulating circuit and described pulse-width modulation maker, thereby disconnect the connection of described current regulating circuit and described switch driving circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210469967.5A CN103841687A (en) | 2012-11-20 | 2012-11-20 | Inverter controller and driving circuit |
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| CN201210469967.5A CN103841687A (en) | 2012-11-20 | 2012-11-20 | Inverter controller and driving circuit |
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| CN103841687A true CN103841687A (en) | 2014-06-04 |
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| CN201210469967.5A Pending CN103841687A (en) | 2012-11-20 | 2012-11-20 | Inverter controller and driving circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617428A (en) * | 2018-12-29 | 2019-04-12 | 深圳和而泰小家电智能科技有限公司 | A kind of Switching Power Supply and motor driven systems |
| CN110139456A (en) * | 2019-05-29 | 2019-08-16 | 南宁一举医疗电子设备股份有限公司 | A kind of multistage booster system for X-ray production apparatus |
-
2012
- 2012-11-20 CN CN201210469967.5A patent/CN103841687A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617428A (en) * | 2018-12-29 | 2019-04-12 | 深圳和而泰小家电智能科技有限公司 | A kind of Switching Power Supply and motor driven systems |
| CN109617428B (en) * | 2018-12-29 | 2024-04-09 | 深圳和而泰小家电智能科技有限公司 | Switch power supply and motor driving system |
| CN110139456A (en) * | 2019-05-29 | 2019-08-16 | 南宁一举医疗电子设备股份有限公司 | A kind of multistage booster system for X-ray production apparatus |
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Application publication date: 20140604 |