CN208549042U - Projector system and its driving device - Google Patents

Abstract

The utility model relates to a projector system and drive arrangement thereof. The driving device comprises a control signal generator, a voltage level isolator and a power converter. The control signal generator provides a first control signal pair. The voltage level isolator has an input terminal circuit and an output terminal circuit. The input end circuit receives a first control signal pair, and the output end circuit generates a second control signal pair according to the first control signal pair. The voltage tolerance of the output-side circuit is higher than that of the input-side circuit. The power converter converts the first power to generate a second power according to the second control signal pair, and provides the second power to drive the light-emitting device. The utility model discloses can effectively drive higher drive voltage's illuminator.

Description

Projector system and its driving device

Technical field

The utility model relates to a kind of projector systems and its driving device more particularly to one kind can be applied to high driving electricity The driving device of the light emitting device of pressure.

Background technique

In the optical projection system of high-order, the demand of light source is higher and higher, thus the quantity of light source is also more and more.Such one Come, the volume needs that a greater number of light sources will cause optical projection system are increased, and also result in the rising of cost.

In existing technical field, by the quantity for reducing laser diode string, but increase in each laser diode string The quantity of laser diode, and increase the driving voltage of corresponding each laser diode string, the demand in Lai Yinying light source design, In driving voltage generated by power adapter.Under the premise of such, based on institute on laser diode string (load end) The phenomenon that voltage of receiving increases, the control signal generator for providing driving power converter control signal can be because afford phase The situation of voltage endurance capability deficiency is generated to high voltage.If promoting the voltage endurance capability of control signal generator thus, can make At the rising of projector system cost.

This " background technique " is partially used only to help to understand the content of the present invention, therefore in " background technique " part institute The content of exposure may be comprising some without constituting the prior art known to those of ordinary skill in technical field.? Content disclosed by " background technique " part, does not represent the content or the utility model one or more embodiment to be solved The problem of, known or recognized by those of ordinary skill in technical field before the present utility model application.

Summary of the invention

The utility model provides a kind of projector system and its driving device, can effectively drive shining for higher drive Device.

The other objects and advantages of the utility model can be obtained from the technical characteristic disclosed by the utility model into one The understanding of step.

It is to realize one of above-mentioned or purpose or other purposes partially or in whole, the driving of one of the utility model embodiment Device is for driving light emitting device.Driving device includes control signal generator, voltage quasi position isolator and power adapter. It controls signal generator and first control signal pair is provided.Voltage quasi position isolator has inlet circuit and circuit of output terminal. Inlet circuit receives first control signal pair, and circuit of output terminal is according to first control signal to generate second control signal It is right.The voltage endurance of circuit of output terminal is higher than the voltage endurance of inlet circuit.Power adapter is according to the second control letter Number second source is generated to convert the first power supply, and provides second source to drive light emitting device.

It is to realize one of above-mentioned or purpose or other purposes partially or in whole, the projection of one of the utility model embodiment Machine system includes camera lens, light emitting device and driving device as described above.Light emitting device includes at least one diode string, and Output beam is projected to camera lens.

Based on above-mentioned, the control signal that low-pressure end is isolated by voltage quasi position isolator for the embodiments of the present invention is produced The power adapter of raw device and high-voltage end can make to control the height that signal generator can not be subjected in power adapter as a result, Voltage prevents control signal generator to be burned out and maintain the state that can be worked normally.In this way, be connect when on power adapter When the voltage value of receipts increases, driving device can still maintain normally to act.

In order to make the above-mentioned features and advantages of the utility model more obvious and understandable, special embodiment below, and cooperate attached drawing It is described in detail below.

Detailed description of the invention

Fig. 1 shows the schematic diagram of the driving device of an embodiment of the present invention.

Fig. 2 shows the embodiments of the power adapter of the utility model embodiment.

Fig. 3 shows the schematic diagram of the embodiment of the voltage quasi position isolator of the utility model embodiment.

Fig. 4 shows the schematic diagram of the driving device of another embodiment of the utility model.

Fig. 5 shows the schematic diagram of the optical projection system of an embodiment of the present invention.

Fig. 6 shows the flow chart of the driving method of the light emitting device of an embodiment of the present invention.

Specific embodiment

In relation to addressing other technologies content, feature and effect before the utility model, in the preferable real of following cooperation attached drawing It applies in the detailed description of example, can clearly present.The direction term being previously mentioned in following embodiment, such as: upper and lower, left, It is right, front or rear etc., it is only the direction with reference to attached drawing.Therefore, the direction term used is not to be used to limit this for illustrating Utility model.

Fig. 1 is please referred to, Fig. 1 shows the schematic diagram of the driving device of an embodiment of the present invention.Driving device 100 includes Control signal generator 110, voltage quasi position isolator 120 and power adapter 130.Driving device 100 is luminous for driving Device 140.Light emitting device 140 can be by multiple diodes (such as laser diode or light emitting diode) string (string) institute It constitutes, but not limited to this.

Signal generator 110 is controlled to provide the first control signal pair being made of control signal CTH and CTL. Voltage quasi position isolator 120 then has inlet circuit 121 and circuit of output terminal 122.In the present embodiment, inlet circuit 121 receive control signal CTH and CTL (first control signal to), and circuit of output terminal 122 is then according to first control signal pair (CTH and CTL) is to generate the second control signal pair being made of control signal DRH and DRL.It is worth noting that, output The voltage endurance of terminal circuit 122 is higher than the voltage endurance of inlet circuit 121.

Specifically bright, inlet circuit 121 is made of the relatively low circuit element of voltage endurance, and to generate Control signal CTH and CTL.Inlet circuit 121 is handled for control signal CTH and CTL, and makes circuit of output terminal 122 generate control signal DRH and DRL according to control signal CTH and CTL respectively.It is coupled based on circuit of output terminal 122 To the power adapter 130 for the voltage signal that can receive opposing high voltage potentials value, therefore, circuit of output terminal 122 is opposite by having The source element of high voltage tolerance level designs.In this way, using the isolation effect of voltage quasi position isolator 120, control letter Number generator 110 can not have to afford the voltage signal in power adapter 130 with opposing high voltage potentials value.Signal is controlled to produce Raw device 110 can be used low pressure-resistant element and be designed, to reduce required circuit cost.

Power adapter 130 receives control signal DRH and DRL (second control signal to), according to control signal DRH with And DRL (is detailed later) Lai Zhihang voltage switching motion to be directed to the first power supply, and uses and generate power supply Vout (second source). In the present embodiment, the voltage value of the first power supply is greater than the voltage value of second source.In the present embodiment, power adapter 130 It can be buck (Buck) power adapter (power converter), for the first power supply with opposing high voltage potentials value Buck power supply switching motion is executed, and generates the power supply Vout (second source) with relative low voltage value.

Power adapter 130 provides power supply Vout (second source) to light emitting device 140, and drive light emitting device 140 with Generate light beam.

Below referring to figure 2., Fig. 2 shows the embodiments of the power adapter of the utility model embodiment.Power supply conversion Device 200 includes transistor T1, T2, inductance L1 and capacitor C1.The first end of transistor T1 receives power supply Vin (the first power supply), The second end of transistor T1 is coupled to center-side SW, and the control terminal of transistor T1 then receives control signal DRH (second control signal The high-end control signal of centering).The first end of transistor T2 is coupled to center-side SW, and the second end of transistor T2 is coupled to reference Ground terminal GND, the control terminal of transistor T2 then receive control signal DRL (the low side control signal of second control signal centering). In addition, the first end of inductance L1 is coupled to center-side SW, the second end of inductance L1 generates power supply Vout (second source).Capacitor C1 is electric capacity of voltage regulation, is coupled in the second end of inductance L1 and with reference between ground terminal GND.

In the present embodiment, power adapter 200 receive control signal DRH and DRL, according to control signal DRH and DRL uses generation lower voltage to be directed to power supply Vin (the first power supply) Lai Zhihang voltage switching motion of higher voltage value The power supply Vout (second source) of value.In detail, power adapter 200 execute power supply switching motion when, transistor T1 with And T2 is respectively according to the staggered conducting of control signal DRH and DRL and disconnection, generates power supply Vout with conversion electric power Vin.? In one embodiment, the voltage value of power supply Vin for example can be 100 volts, and the voltage value of power supply Vout for example can be 60 volts It is special.

It is noted that provide the control signal DRH and DRL with appropriate voltage value to respectively drive crystal Pipe T1 and T2, center-side SW are coupled to the output end of voltage quasi position isolator (the voltage quasi position isolator 120 of example as shown in figure 1) Circuit (circuit of output terminal 122 of example as shown in figure 1).Also therefore, the high-voltage value that may have on center-side SW, which has, to be applied To circuit of output terminal.And by high voltage element be arranged circuit of output terminal, by can not by the voltage on center-side SW and The phenomenon that raw damage, and normal operation can be maintained.

Below referring to figure 3., Fig. 3 shows the signal of the embodiment of the voltage quasi position isolator of the utility model embodiment Figure.Voltage quasi position isolator 300 includes by buffer BUF1, BUF2, level-shift device (level shifter) 330, under-voltage The input terminal electricity that lock-in circuit (under voltage lock-out circuit) 350 and logical-arithmetic unit 340 are constituted Road, voltage quasi position isolator 300 include separately the circuit of output terminal being made of output driver 310 and 320.Buffer BUF1, BUF2 receive control signal CTH and CTL respectively, and provide buffering signals BCTH and BCTL respectively to level-shift Device 330.In the present embodiment, buffer BUF1, BUF2 is all magnetic hysteresis type buffer, but not limited to this.Level-shift device 330 Buffering signals BCTH and BCTL are received, and is deviated for the voltage value of buffering signals BCTH and BCTL, to produce respectively Raw voltage offseting signal LV1 and LV2.In the present embodiment, undervoltage lockout circuit 350 receives pull-up (pull-up) power supply VDD1 and power vd D2 (third power supply), and the height according to the voltage value for judging pull-up power supply VDD1 and power vd D2 To generate locking signal UVLO.It may also be said that undervoltage lockout circuit 350 detects pull-up power supply VDD1 and power vd D2 (third Power supply) voltage it is whether too low to generate locking signal UVLO.In the present embodiment, on undervoltage lockout circuit 350 is judged When drawing at least one of voltage value in power vd D1 and power vd D2 not high enough, then locking signal is accordingly generated UVLO。

In implementation detail, settable voltage comparator circuit in undervoltage lockout circuit 350, with for pull-up power supply VDD1 with And the voltage value of power vd D2 is compared with preset standard value, and is used and generated locking signal UVLO.Voltage is more electric Lu Zeke is implemented using voltage comparator circuit well known within the skill of those ordinarily skilled, is not particularly limited.

Logical-arithmetic unit 340 executes operation with voltage offseting signal LV1, LV2 respectively for locking signal UVLO with respectively Generate signal A1 and A2.Signal A1 and A2 are respectively transmitted to output driver 310 and 320, to control output driver 310 And 320 running.

Subsidiary one is mentioned that, when at least one of voltage value in pull-up power supply VDD1 and power vd D2 is not high enough When, logical-arithmetic unit 340 can generate signal A1, A2 according to locking signal UVLO, and make output driver by signal A1, A2 310 and 320 is locked without executing movement.

It may include one or more logic gate and/or flip-flop, the latch unit of logic circuit etc. in logical-arithmetic unit 340 Logic circuit component.The composition of logic circuit component in logical-arithmetic unit 340 can be ripe by those of ordinary skill in the art institute The Logic Circuit Design mode known is completed, and is not limited specifically.

In the present embodiment, pull-up power supply VDD1 is provided by pull-up circuit 301.Pull-up circuit 301 includes diode D_BOOTAnd capacitor C_BOOT, and it is coupled to center-side SW and output driver 310.The diode D of pull-up circuit 301_BOOTSun Pole receives bootlace (boot strap) voltage V_BOOT, diode D_BOOTCathode be coupled to output driver 310 and capacitor C_BOOT One end.In the present embodiment, diode D_BOOTCathode provide pull-up power supply VDD1.Capacitor C_BOOTThe other end be then coupled to Center-side SW.It is reference voltage, the diode D of pull-up circuit 301 based on the voltage on center-side SW_BOOTAccording to bootlace voltage V_BOOTWith generation/offer pull-up power supply VDD1 to output driver 310.Based on pull-up power supply VDD1, output driver 310 then may be used Basis signal A1 controls signal DRH (high-end control signal) to generate.

In the present embodiment, output driver 310 includes transistor M1 and M2.The transistor of output driver 310 M1 and M2 is coupled in series between pull-up power supply VDD1 and center-side SW.In the present embodiment, the first end of transistor M1 Pull-up power supply VDD1 is received, the second end of transistor M1 generates control signal DRH (the high-end control of second control signal centering Signal).In the present embodiment, the first end of transistor M2 is coupled to the second end of transistor M1, the second end coupling of transistor M2 It is connected to center-side SW.The control terminal of transistor M1 and M2 are mutually coupled, and receive signal A1.Output driver 310 and foundation Signal A1 is to generate control signal DRH.On the other hand, output driver 320 includes transistor M3 and M4.Output driver 320 transistor M3 and M4 is coupled in series in power vd D2 (third power supply) and with reference between ground terminal GND.In this implementation In example, the first end of transistor M3 receives power vd D2 (third power supply), and the second end of transistor M3 generates control signal DRL (low side of second control signal centering controls signal).In the present embodiment, the first end of transistor M4 is coupled to transistor M3 Second end, the second end of transistor M4 is coupled to reference to ground terminal GND.The control terminal of transistor M3 and M4 be mutually coupled with Receive signal A2.320 basis signal A2 of output driver is to generate control signal DRL (low side control signal).

In the present embodiment, the voltage value for controlling signal DRH can be on pull-up power supply VDD1 and center-side SW Transition between voltage, the voltage value for controlling signal DRL can turn in power vd D2 and with reference between the voltage on ground terminal GND State.

Below referring to Fig. 3 and Fig. 4, wherein Fig. 4 shows showing for the driving device of another embodiment of the utility model It is intended to.Driving device 400 includes control signal generator 410, voltage quasi position isolator 420 and power adapter 430.Driving Device 400 is to drive light emitting device 440.It controls signal generator 410 and receives power supply VC1 using as operation power.Capacitor C2 As electric capacity of voltage regulation, and it is coupled in series between power supply VC1 and reference ground terminal GND1.Signal generator 410 is controlled by two Pole pipe D1 receives power supply VC1, enable voltage of the power supply VC1 as control signal CTH.In addition, diode D2 and capacitor C21 institute The pull-up circuit of formation is coupled to control signal generator 410, and according to reference voltage VC2 to provide upper pull-up voltage to controlling letter Number generator 410, and the high voltage level to set control signal CTH.In the present embodiment, the anode of diode D2 connects Reference voltage VC2 is received, capacitor C21 is then coupled in series in the cathode of diode D2 and with reference between ground terminal GND1.

Voltage quasi position isolator 420 receives control signal CTH and CTL, and receives power supply VC3 using as operation power. Capacitor C4 is electric capacity of voltage regulation, and is coupled in series between power supply VC3 and reference ground terminal GND1.Voltage quasi position isolator 420 Separately by diode D3 to receive power supply VC3.In the present embodiment, the cathode of diode D3 can provide bootlace voltage, and to The high-voltage value of setting control signal DRH.

On the other hand, capacitor C5 is coupled in series between the cathode and center-side SW of diode D3, capacitor C5 and Diode D3 forms pull-up circuit.

It separately include capacitor C3, resistance R1 and diode D4, resistance R1 and two on the conducting wire of transmission of control signals CTH Pole pipe D4 coupled in parallel.In the present embodiment, capacitor C3 is coupled in series in the first buffer of voltage quasi position isolator 420 Between endpoint E1 receives the path of control signal CTH, resistance R1 is coupled between control signal CTH and reference ground terminal GND1, and two The cathode of pole pipe D4 is coupled to the endpoint E1 of the first buffer to receive control signal CTH, and the anode of diode D4 is then coupled to With reference to ground terminal GND1.In addition, another includes the endpoint E2 for being coupled in the second buffer on the conducting wire of transmission of control signals CTL With the resistance R2 between reference ground terminal GND1.

On the other hand, on the conducting wire of transmission of control signals DRH, another resistance R3, R4 and in parallel with resistance R4 of being arranged The diode D5 of coupling.On the conducting wire of transmission of control signals DRL, then resistance R5, R6 and coupling in parallel with resistance R6 are separately set The diode D6 connect.

Power adapter 430 includes the transistor T1 and T2, inductance L1 and capacitor C7 of coupled in series.Resistance R3 series connection It is coupled between the control terminal of endpoint E3 and transistor T1 of the first output driver, resistance R4 is coupled in series in transistor T1 Control terminal and center-side SW between, resistance R5 is coupled in series in the control of the endpoint E4 and transistor T2 of the second output driver Between end processed, resistance R6 is coupled in series in the control terminal of transistor T2 and with reference between ground terminal GND2.The cathode of diode D5 It is coupled to the control terminal of transistor T1, the anode of diode D5 is coupled to center-side SW, and the cathode of diode D6 is coupled to crystal The control terminal of pipe T2, the anode of diode D6 are coupled to reference to ground terminal GND2.Transistor T1 and T2 are coupled in series in power supply Between Vin and reference ground terminal GND2, and control signal DRH and DRL is controlled by execute switching action.By crystalline substance The switching action of body pipe T1 and T2, power adapter 430 generate power supply Vout to drive light emitting device 440.

In the present embodiment, light emitting device 440 includes multiple 1~LDN of laser diode LD, but not limited to this.Laser two Pole pipe LD1~LDN is serially connected coupling, and according to the received power supply Vout of institute to generate light beam.In other embodiments, it shines Device 440 may also comprise it is multiple be serially connected coupling and according to received power supply Vout to generate the light emitting diode of light beam, But still it is without being limited thereto.

Referring to figure 5., Fig. 5 shows the schematic diagram of the optical projection system of an embodiment of the present invention.Optical projection system 500 includes Driving device 510, light emitting device 520 and camera lens 530, light emitting device 520 project output beam to camera lens 530.Driving device 510 can implement according to the driving device 100 and 400 of previous embodiment.Driving device 510 generates power supply Vout, and provides electricity Source Vout is to light emitting device 520.Light emitting device 520 generates light beam LB according to power supply Vout, and provides light beam LB to camera lens 530.

Fig. 6 is please referred to, Fig. 6 shows the flow chart of the driving method of the light emitting device of an embodiment of the present invention.Step S610 provides control signal generator to generate first control signal pair.Step S620 provides voltage quasi position isolator, by electricity The inlet circuit of level isolator is pressed to receive first control signal pair, by the circuit of output terminal foundation of voltage quasi position isolator First control signal is to generate second control signal pair, wherein the voltage endurance of circuit of output terminal is higher than inlet circuit Voltage endurance.Step S630 provides power adapter to generate the to convert the first power supply according to second control signal Two power supplys, and second source is provided to drive light emitting device.

About the implementation detail of above-mentioned steps, there is detailed explanation in multiple embodiments above-mentioned and embodiment, This without repeating more.

In conclusion the control signal of low-pressure system is isolated using voltage quasi position isolator for the embodiments of the present invention The power adapter of generator and high-pressure system.In this way, power adapter received power supply voltage value improve When, driving device can keep normally operating, and the cost of holding circuit will not rise.

Only as described above, the only preferred embodiment of the utility model, when the utility model cannot be limited with this The range of implementation, i.e., the simple equivalence changes made generally according to claims of the utility model and description with repair Decorations, all still belong in the range that the utility model patent covers.In addition any embodiment of the utility model or claims are not The disclosed whole purpose of the utility model or advantage or feature must be reached.In addition, abstract part and title are intended merely to assist Patent document search is used, and not is used to limit the interest field of the utility model.In addition, in this specification or claims The terms such as " first " that refers to, " second " only to name the title or the different embodiments of difference or range of element (element), And not it is used to limit the upper limit or lower limit in component count.

[symbol description]

100,400,510: driving device

110,410: control signal generator

120,300,420: voltage quasi position isolator

121: inlet circuit

122: circuit of output terminal

130,200: power adapter

140,440,520: light emitting device

500: optical projection system

530: camera lens

CTH, CTL, DRH, DRL: control signal

Vin, Vout, VDD2, VC1, VC2: power supply

T1, T2: transistor

L1: inductance

C1~C7, C21, C_BOOT: capacitor

DBOOT, D1~D6: diode

R1~R6: resistance

SW: center-side

GND, GND1, GND2: ground terminal is referred to

BUF1, BUF2: buffer

330: level-shift device

350: undervoltage lockout circuit

340: logical-arithmetic unit

BCTH, BCTL: buffering signals

LV1, LV2: voltage offseting signal

VDD1: pull-up power supply

UVLO: locking signal

A1, A2: signal

LED1~LEDN: light emitting diode

LB: light beam

S610~S630: the actuation step of light emitting device.

Claims (27)

1. A driving device for driving a light-emitting device, wherein the driving device comprises: a control signal generator, providing a first control signal pair; The voltage level isolator has an input end circuit and an output end circuit, the input end circuit receives the first control signal pair, the output end circuit generates a second control signal pair according to the first control signal pair, wherein the output end circuit the voltage tolerance of the terminal circuit is higher than the voltage tolerance of the input terminal circuit; and The power converter converts the first power source to generate a second power source according to the second control signal pair, and provides the second power source to drive the light-emitting device. 2. The drive device of claim 1, wherein the power converter comprises: a first transistor, the first end of the first transistor receives the first power supply, the second end of the first transistor is connected to the center end, and the control end of the first transistor receives the high-side control signal of the second control signal pair ; a second transistor, the first terminal of the second transistor is coupled to the center terminal, the second terminal of the second transistor is coupled to the first reference ground terminal, and the control terminal of the second transistor receives the second control signal pair low-side control signals in the an inductor, the first end of the inductor is coupled to the center end, and the second end of the inductor generates the second power supply. 3 . The driving device of claim 2 , wherein the power converter performs a step-down voltage conversion operation for the first power source to generate the second power source, wherein the voltage value of the first power source is greater than that of the first power source. 4 . 2. The voltage value of the power supply. 4. The driving device of claim 2, wherein the output circuit comprises: a first output driver, coupled between the pull-up power supply and the center terminal, to generate the high-side control signal according to the pull-up power supply, the voltage on the center terminal and the first signal of the first control signal pair; and The second output driver is coupled between the third power supply and the second reference ground terminal, and generates the low-side control signal according to the voltage on the center terminal and the second signal of the first control signal pair. 5. The driving device of claim 4, wherein the driving device further comprises: A pull-up circuit, coupled to the first output driver and the center terminal, receives a bootstrap voltage, and generates the pull-up power supply according to the bootstrap voltage. 6. The driving device of claim 5, wherein the pull-up circuit comprises: a diode, the anode of the diode receives the bootstrap voltage and the cathode of the diode provides the pull-up power supply; and A capacitor is coupled in series between the cathode of the diode and the center end. 7. The driving device of claim 4, wherein the input circuit comprises: a first buffer, receiving the first signal and providing the first buffered signal; a second buffer that receives the second signal and provides a second buffered signal; a level shifter, shifting the first buffer signal and the second buffer signal to generate a first voltage shift signal and a second voltage shift signal respectively; an under-voltage lockout circuit that detects whether the voltages of the pull-up power supply and the third power supply are too low to generate a lockout signal; and a logic operator that performs operations on the lock signal, the first voltage offset signal and the second voltage offset signal to generate a third signal and a fourth signal, respectively; Wherein, the third signal and the fourth signal are respectively provided to the control terminals of the first output driver and the second output driver. 8. The driving device of claim 7, wherein the first output driver comprises: a third transistor, the first end of the third transistor receives the pull-up power supply, the second end of the third transistor generates the high-side control signal, and the control end of the third transistor receives the third signal; and a fourth transistor, the first end of the fourth transistor is coupled to the second end of the third transistor, the second end of the fourth transistor is coupled to the center end, and the control end of the fourth transistor receives the third transistor Signal. 9. The driving device of claim 7, wherein the second output driver comprises: a third transistor, the first terminal of the third transistor receives the third power supply, the second terminal of the third transistor generates the low-side control signal, and the control terminal of the third transistor receives the fourth signal; and a fourth transistor, the first terminal of the fourth transistor is coupled to the second terminal of the fourth transistor, the second terminal of the fourth transistor is coupled to the second reference ground terminal, and the control terminal of the fourth transistor receives the fourth signal. 10 . The driving device of claim 7 , wherein the first buffer and the second buffer are hysteresis buffers. 11 . 11. The driving device of claim 7, wherein the driving device further comprises: a diode, the cathode of which is coupled to the first buffer, and the anode of which is coupled to the third reference ground terminal; a first resistor, coupled in parallel with the diode; a second resistor, coupled between the second buffer and the third reference ground; and A capacitor is coupled in series between the paths of the first buffer for receiving the first signal. 12. The driving device of claim 7, wherein the driving device further comprises: The pull-up circuit is coupled to the control signal generator for setting the voltage level of the first signal. 13. The driving device of claim 12, wherein the pull-up circuit comprises: a diode, the anode of which receives the reference voltage; and A capacitor is coupled in series between the cathode of the diode and the third reference ground terminal. 14. The driving device of claim 4, wherein the driving device further comprises: a first resistor, coupled in series between the first output driver and the control terminal of the first transistor; a second resistor, coupled in series between the control end of the first transistor and the center end; a third resistor, coupled in series between the second output driver and the control terminal of the second transistor; a fourth resistor, coupled in series between the control terminal of the second transistor and the second reference ground terminal; a first diode, the cathode of the first diode is coupled to the control terminal of the first transistor, and the anode of the first diode is coupled to the center terminal; and A second diode, the cathode of the second diode is coupled to the control terminal of the second transistor, and the anode of the second diode is coupled to the second reference ground terminal. 15. The driving device of claim 1, wherein the light emitting device comprises at least one laser diode string or at least one light emitting diode string. 16. A projector system, characterized in that the projector system comprises a lens, a light-emitting device and a driving device, wherein: The light-emitting device includes at least one diode string that projects an output beam to the lens; and The driving device is used for driving the light-emitting device, and the driving device includes a control signal generator, a voltage level isolator and a power converter, wherein: the control signal generator provides a first control signal pair; The voltage level isolator has an input end circuit and an output end circuit, the input end circuit receives the first control signal pair, the output end circuit generates a second control signal pair according to the first control signal pair, wherein the output end circuit the voltage tolerance of the terminal circuit is higher than the voltage tolerance of the input terminal circuit; and The power converter converts the first power source to generate a second power source according to the second control signal pair, and provides the second power source to drive the light-emitting device. 17. The projector system of claim 16, wherein the power converter comprises: a first transistor, the first end of the first transistor receives the first power supply, the second end of the first transistor is connected to the center end, and the control end of the first transistor receives the high-side control signal of the second control signal pair ; a second transistor, the first terminal of the second transistor is coupled to the center terminal, the second terminal of the second transistor is coupled to the first reference ground terminal, and the control terminal of the second transistor receives the second control signal pair low-side control signals in the an inductor, the first end of the inductor is coupled to the center end, and the second end of the inductor generates the second power supply. 18 . The projector system of claim 17 , wherein the power converter performs a step-down voltage conversion operation for the first power source to generate the second power source, wherein the voltage value of the first power source is greater than the voltage value of the first power source. 19 . The voltage value of the second power supply. 19. The projector system of claim 17, wherein the output circuit comprises: a first output driver, coupled between the pull-up power supply and the center terminal, to generate the high-side control signal according to the pull-up power supply, the voltage on the center terminal and the first signal of the first control signal pair; and The second output driver is coupled between the third power supply and the second reference ground terminal, and generates the low-side control signal according to the voltage on the center terminal and the second signal of the first control signal pair. 20. The projector system of claim 19, wherein the driving device further comprises: A pull-up circuit, coupled to the first output driver and the center terminal, receives a bootstrap voltage, and generates the pull-up power supply according to the bootstrap voltage. 21. The projector system of claim 20, wherein the pull-up circuit comprises: a diode, the anode of the diode receives the bootstrap voltage and the cathode of the diode provides the pull-up power supply; and A capacitor is coupled in series between the cathode of the diode and the center end. 22. The projector system of claim 19, wherein the input circuit comprises: a first buffer, receiving the first signal and providing the first buffered signal; a second buffer that receives the second signal and provides a second buffered signal; a level shifter, shifting the first buffer signal and the second buffer signal to generate a first voltage shift signal and a second voltage shift signal respectively; an under-voltage lockout circuit that detects whether the voltages of the pull-up power supply and the third power supply are too low to generate a lockout signal; and a logic operator that performs operations on the lock signal, the first voltage offset signal and the second voltage offset signal to generate a third signal and a fourth signal, respectively; Wherein, the third signal and the fourth signal are respectively provided to the control terminals of the first output driver and the second output driver. 23. The projector system of claim 22, wherein the first output driver comprises: a third transistor, the first end of the third transistor receives the pull-up power supply, the second end of the third transistor generates the high-side control signal, and the control end of the third transistor receives the third signal; and a fourth transistor, the first end of the fourth transistor is coupled to the second end of the third transistor, the second end of the fourth transistor is coupled to the center end, and the control end of the fourth transistor receives the third transistor Signal. 24. The projector system of claim 22, wherein the second output driver comprises: a third transistor, the first terminal of the third transistor receives the third power supply, the second terminal of the third transistor generates the low-side control signal, and the control terminal of the third transistor receives the fourth signal; and a fourth transistor, the first terminal of the fourth transistor is coupled to the second terminal of the fourth transistor, the second terminal of the fourth transistor is coupled to the second reference ground terminal, and the control terminal of the fourth transistor receives the fourth signal. 25. The projector system of claim 22, wherein the first buffer and the second buffer are hysteresis buffers. 26. The projector system of claim 22, wherein the driving device further comprises: The pull-up circuit is coupled to the control signal generator for setting the voltage level of the first signal. 27. The projector system of claim 26, wherein the pull-up circuit comprises: a diode, the anode of which receives the reference voltage; and A capacitor is coupled in series between the cathode of the diode and the third reference ground terminal.