CN203027121U - Power switch and application circuit based on same - Google Patents
Power switch and application circuit based on same Download PDFInfo
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- CN203027121U CN203027121U CN 201320007635 CN201320007635U CN203027121U CN 203027121 U CN203027121 U CN 203027121U CN 201320007635 CN201320007635 CN 201320007635 CN 201320007635 U CN201320007635 U CN 201320007635U CN 203027121 U CN203027121 U CN 203027121U
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Abstract
The utility model provides a power switch. The power switch comprises a comparator, a two-stage voltage error amplifier, a trigger, a latch and a driver, wherein the comparator is used for comparing a voltage feedback signal with the reference voltage of a cathode input end, and an output comparison signal is amplified through the two-stage voltage error amplifier and then is output to the trigger; the trigger is electrically connected with the latch and is used for processing the received signal into a constant voltage control signal and outputting the constant voltage control signal to the driver through the latch; and the driver is electrically connected with the latch and is used for adjusting switching frequency and a duty ratio according to the received constant voltage control signal. The utility model aslo discloses two BUCK-type application circuits based on the power switch. The power switch can realize high voltage and circuit accuracy.
Description
Technical field
The utility model relates to the power management techniques field of AC-DC converter, more particularly, relates to a kind of power switch, reaches the application circuit based on power switch.
Background technology
The designed scheme of traditional power switch mainly comprise need not isolation applications for household electrical appliances market application etc. the BUCK type scheme.These Scheme Characteristics are: circuit structure is simple, and peripheral cell is few.But the distinct disadvantage that exists is the output voltage low precision, and reason has: (1) adopts pulse width modulation (PWM), adopts during underloading and skips pulse mode (BURST MODE), and shortcoming is to exist floating voltage to upwarp, and voltage accuracy is poor; (2) the voltage feedback circuit simplicity of design of these traditional products only has the one-level error amplifier to amplify processing to the error signal of output voltage, and the error signal gain is low, is also a reason that causes the output voltage low precision.Above-mentioned conventional power switch is also fairly simple for the control of output current, is only a kind of overcurrent protection, the output current low precision.
In the household electrical appliances application, voltage accuracy is also an important indicator investigating power source performance, and the above conventional power switch has relatively poor voltage accuracy, usually surpasses ± 10%, is unfavorable for the household electrical appliances power supply to institute's power supply unit.
The utility model content
In view of this, the utility model provides a kind of power switch, reaches the application circuit based on power switch, to realize higher voltage and current precision.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of power switch comprises: comparator, the first voltage error amplifier, second voltage error amplifier, trigger, latch and driver; Wherein:
The negative input of described comparator is electrically connected to the positive pole of described the first voltage error amplifier, and logic level and the pulse frequency modulated signal of described comparator output compare, and determine the time of sampling time detection module; The anodal input voltage feedback signal of the first error amplifier and the reference voltage of negative input compare, and the output error amplifying signal is to the constant voltage module;
Described the first voltage error amplifier is connected with described second voltage error amplifier via the constant voltage module, the first order error amplification signal that produces is applied to the positive input terminal of described the second error amplifier, further produces second level error amplification signal;
Described second voltage error amplifier is connected with described trigger, the signal after the amplification of described the first error amplifier output of receiving is amplified, and the signal after amplifying exports described trigger to;
Described trigger is electrically connected to described latch, and the signal that receives is treated to the constant voltage control signal, and exports described constant voltage control signal to described driver by described latch;
Described driver is electrically connected to described latch, according to the described constant voltage control signal by-pass cock frequency and the duty ratio that receive.
A kind of application circuit based on power switch, the output positive voltage comprises: power switch, fly-wheel diode, filter inductance, diode, electric capacity, the first feedback resistance, the second feedback resistance and sampling resistor; Wherein:
Described fly-wheel diode is connected in the floating lower margin of described power switch and the low pressure of circuit is exported between ground;
Described filter inductance is connected between the low-voltage output of the floating lower margin of described power switch and circuit;
Described diode is connected between the low-voltage output of the feeder ear pin of described power switch and circuit;
Described electric capacity is connected between the negative pole end of the feeder ear pin of described power switch and described fly-wheel diode;
Be connected in after described the first feedback resistance and the series connection of the second feedback resistance between the anodal and floating lower margin of described diode, and the electric connecting point of two feedback resistances is connected with the Voltage Feedback pin of described power switch;
Described sampling resistor is connected between the current sample pin of the floating lower margin of described power switch and power switch.
Preferably, described circuit also comprises: starting resistance;
Described starting resistance is connected between the high pressure collector terminal and feeder ear pin of described power switch, for described power switch provides primary power.
Preferably, described circuit also comprises: fuse resistance, rectification module, external capacitor, output storage capacitor and load; Wherein:
Described fuse resistance one end is connected with high voltage input terminal, and the other end is connected with described rectification module;
The described rectification module other end is connected with the high pressure collector electrode pin of described power switch;
Described external capacitor is connected between the CPC pin and floating lower margin of described power switch;
Described output storage capacitor and load are connected in parallel on respectively the low-voltage output of circuit and export between ground.
A kind of application circuit based on power switch, the output negative voltage comprises: power switch, fly-wheel diode, filter inductance, diode, electric capacity, the first feedback resistance, the second feedback resistance and sampling resistor; Wherein:
Described filter inductance is connected in the floating lower margin of described power switch and the low pressure of circuit is exported between ground;
Described fly-wheel diode is connected between the low-voltage output of the floating lower margin of described power switch and circuit;
Described diode is connected between the low-voltage output of the feeder ear pin of described power switch and circuit;
Described electric capacity is connected between the feeder ear pin of described power switch and its hold floatingly;
Be connected in after described the first feedback resistance and the series connection of the second feedback resistance between the anodal and floating lower margin of described diode, and the electric connecting point of two feedback resistances is connected with the Voltage Feedback pin of described power switch;
Described sampling resistor is connected between the floating lower margin and current sample pin of described power switch.
Preferably described circuit also comprises: starting resistance;
Described starting resistance is connected between the high pressure collector terminal and feeder ear pin of described power switch, for described power switch provides primary power.
Preferably, described circuit also comprises: fuse resistance, rectification module, external capacitor, output storage capacitor and load; Wherein:
Described fuse resistance one end is connected with high voltage input terminal, and the other end is connected with described rectification module;
The described rectification module other end is connected with the high pressure collector electrode pin of described power switch;
Described external capacitor is connected between the CPC pin and floating lower margin of described power switch;
Described output storage capacitor and load are connected in parallel on respectively the low-voltage output of circuit and export between ground.
Can find out from above-mentioned technical scheme, the disclosed a kind of power switch of the utility model,
Output logic level and pulse frequency modulated signal pfm by comparator compare, and determine the time T ons of sampling time detection module; The anodal input voltage feedback signal of the first error amplifier and the reference voltage V of negative input
FBCompare, then through the second further fault in enlargement signal of error amplifier; Signal after amplifying by trigger is treated to the constant voltage control signal, and by constant voltage control signal by-pass cock frequency and duty ratio that latch and driver basis receive, has realized better output current precision.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or description of the Prior Art, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of the disclosed a kind of power switch of the utility model embodiment;
Fig. 2 is the circuit diagram of the disclosed a kind of power switch of the utility model;
Fig. 3 is the disclosed a kind of application circuit of exporting the power switch of positive voltage of the utility model embodiment;
Fig. 4 is the disclosed a kind of application circuit of exporting the power switch of negative voltage of the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only a part of embodiment of the present utility model, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
The utility model embodiment discloses a kind of power switch, has reached the application circuit based on power switch, to realize higher voltage and current precision.
As shown in Figure 1, a kind of power switch comprises: comparator 11, the first voltage error amplifier 12, second voltage error amplifier 13, trigger 14, latch 15 and driver 16; Wherein:
Output logic level and the pulse frequency modulated signal of comparator 11 compare, and determine transformer secondary ON time signal; The anodal input voltage feedback signal of the first error amplifier 12 and the reference voltage of negative input compare, and the output error amplifying signal is to the constant voltage module;
The first voltage error amplifier 12 is electrically connected to second voltage error amplifier 13 via the constant voltage module, the first order error amplification signal that produces is applied to the positive input terminal of the second error amplifier 13, further produces second level error amplification signal;
Second voltage error amplifier 13 is electrically connected to trigger 14, the signal after the amplification of the first error amplifier 12 output of receiving is amplified, and the signal after amplifying exports trigger 14 to;
Trigger 14 is electrically connected to latch 15, and the signal that receives is treated to the constant voltage control signal, and exports described constant voltage control signal to driver 16 by latch 15;
Driver 16 is electrically connected to latch 15, according to the described constant voltage control signal by-pass cock frequency and the duty ratio that receive.
Concrete, compare by the reference voltage of comparator with voltage feedback signal and negative input, the signal of output is more afterwards amplified by the two-stage voltage error amplifier, and the signal after amplifying by trigger is treated to the constant voltage control signal, and by constant voltage control signal by-pass cock frequency and duty ratio that latch and driver basis receive, realized better output current precision.
Concrete, be illustrated in figure 2 as the physical circuit figure of power switch, comprise: comparator 201, the first error amplifier 202, the second error amplifier 203, trigger 204, latch 205, driver 206 and overvoltage protection and current foldback circuit, sampling time detection module, voltage stabilizing and biasing circuit, constant voltage module, line voltage compensation circuit, peak current and LEB control circuit, fixed current control circuit and rest-set flip-flop; The concrete comparator 201 that passes through compares the reference voltage of voltage feedback signal and negative input, the signal of output is more afterwards amplified by the first error amplifier 202 and the second error amplifier 203, and the signal after amplifying by trigger 204 is treated to the constant voltage control signal, and by constant voltage control signal by-pass cock frequency and duty ratio that latch 205 and driver 206 bases receive, realized better output current precision.
The utility model has proposed the application circuit of two kinds of non-isolation (BUCK) types based on high-precision power switch, all have higher voltage and current precision.
Two kinds of BUCK type circuit comprise a kind of application circuit of positive voltage output and the application circuit of a kind of negative voltage output, all belong to the non-type of isolation application circuit of high-performance and low-cost.
Concrete, the output positive voltage based on the application circuit of power switch as shown in Figure 3, comprising: power switch 100, fly-wheel diode 110, filter inductance 109, diode 103, electric capacity 108, the first feedback resistance 101, the second feedback resistance 102 and sampling resistor 107; Wherein:
Fly-wheel diode 110 is connected in the floating ground GND pin of power switch 100 and the low pressure of circuit is exported between ground E-;
Filter inductance 109 is connected between the low-voltage output V0 of the floating ground GND pin of power switch 100 and circuit;
Diode 103 is connected between the low-voltage output V0 of the feeder ear Vcc pin of power switch 100 and circuit;
Electric capacity 108 is connected between the negative pole end of the feeder ear Vcc pin of power switch 100 and fly-wheel diode 110;
Be connected between the positive terminal and floating ground GND pin of diode 103 after the first feedback resistance 101 and the second feedback resistance 102 series connection, and the mid point of series connection is connected with the Voltage Feedback FB pin of power switch 100;
Sampling resistor 107 is connected between the floating ground GND pin and current sample CS pin of power switch 100.
Concrete, circuit also comprises: starting resistance 106; Starting resistance 106 is connected between the high pressure collector electrode C pin and feeder ear Vcc pin of power switch 100, for power switch 100 provides primary power.
Concrete, circuit also comprises: fuse resistance 118, the rectification modules by 113 ~ 117 formations, external capacitor 105, output storage capacitor 111 and load 112; Wherein:
Fuse resistance 118 1 ends are connected with high voltage input terminal, and the other end is connected with rectification module;
The rectification module other end is connected with the high pressure collector electrode C pin of power switch 100;
External capacitor 105 is connected between the CPC pin and floating ground GND pin of power switch 100;
Output storage capacitor 111 and load 112 are connected in parallel on respectively between the low-voltage output V0 and low pressure output ground E-of circuit.
During normal operation, V0 is through the first feedback resistance 101 and the second feedback resistance 102 dividing potential drops in low pressure output, by the FB end input of power switch 100, compares by the reference voltage with comparator negative terminal 0.1V, and the judgement output loading is underloading or heavy duty; And with the first voltage error amplifier (output signal together with as the front end input signal of second voltage error amplifier, produce constant voltage control signal (CV_ctrl) through trigger, be input to latch determine switch frequency, open power tube through output driver again, meanwhile, the CS end that the both end voltage signal of filter inductance 109 peak current sampling resistors 107 is input to power switch 100 compares with reference voltage, when the electric current of filter inductance 109 reaches preset value, through output driver switch-off power pipe.
Concrete, the output negative voltage based on the application circuit of power switch as shown in Figure 4, comprising: power switch 200, fly-wheel diode 209, filter inductance 210, diode 203, electric capacity 208, the first feedback resistance 201, the second feedback resistance 202 and sampling resistor 207; Wherein:
Filter inductance 210 is connected in the floating ground GND pin of power switch 200 and the low pressure of circuit is exported between ground E-;
Fly-wheel diode 209 is connected between the low-voltage output-V0 of the floating ground GND pin of power switch 200 and circuit;
Electric capacity 208 is connected between the negative pole end of the feeder ear Vcc pin of power switch 200 and fly-wheel diode 209;
Be connected between the feeder ear Vcc and floating ground GND pin of power switch 200 after the first feedback resistance 201 and the second feedback resistance 202 series connection, and the mid point of series connection is connected with the Voltage Feedback FB pin of power switch 200;
Sampling resistor 207 is connected between the floating ground GND pin and current sample CS pin of power switch 200.
Concrete, circuit also comprises: starting resistance 206; Starting resistance 206 is connected between the high pressure collector electrode C pin and feeder ear Vcc pin of power switch 200, for power switch 200 provides primary power.
Concrete, circuit also comprises: fuse resistance 218, the rectification modules by 213 ~ 217 formations, external capacitor 205, output storage capacitor 211 and load 212; Wherein:
Fuse resistance 218 1 ends are connected with high voltage input terminal, and the other end is connected with rectification module;
The rectification module other end is connected with the high pressure collector electrode C pin of power switch 200;
Output storage capacitor 211 and load 212 are connected in parallel on respectively between the low-voltage output-V0 and low pressure output ground E-of circuit.
During normal operation, low pressure output-V0, compares by the reference voltage with comparator negative terminal 0.1V by the FB end input of power switch 200 through the first feedback resistance 201 and the second feedback resistance 202 dividing potential drops, and the judgement output loading is underloading or heavy duty; And with the first voltage error amplifier (output signal together with as the front end input signal of second voltage error amplifier, produce constant voltage control signal (CV_ctrl) through trigger, be input to latch determine switch frequency, open power tube through output driver again, meanwhile, the CS end that the both end voltage signal of filter inductance 210 peak current sampling resistors 207 is input to power switch 200 compares with reference voltage, when the electric current of filter inductance 210 reaches preset value, through output driver switch-off power pipe.
Owing to containing two-stage voltage error signal amplifier, the feedback voltage error to be carried out two-stage amplify, the error signal gain is high, thereby this BUCK circuit based on the positive and negative output voltage of high voltage precision power switch possesses better voltage accuracy.
The disclosed positive and negative output voltage BUCK circuit of the utility model all works in the electric current discontinuous mode, and under a certain fixing transformer primary side peak current, switching frequency height and output loading size relation in direct ratio.Lower switching frequency has reduced the driving loss of PFM controller, the switching loss of power tube etc., thereby has guaranteed that integrated circuit has higher conversion efficiency and lower stand-by power consumption.Simultaneously, adopt BURST MODE control mode to reduce stand-by power consumption with PWM and compare, the disclosed positive and negative output voltage BUCK circuit of the utility model uses the PFM control mode, and when unloaded, output voltage upwarps less, and this has also guaranteed better voltage accuracy.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment that between each embodiment, identical similar part is mutually referring to getting final product.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the utility model.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from spirit or scope of the present utility model, realization in other embodiments.Therefore, the utility model will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (7)
1. a power switch, is characterized in that, comprising: comparator, the first voltage error amplifier, second voltage error amplifier, trigger, latch and driver; Wherein:
The negative input of described comparator is electrically connected to the positive pole of described the first voltage error amplifier, and logic level and the pulse frequency modulated signal of described comparator output compare, and determine the time of sampling time detection module; The anodal input voltage feedback signal of the first error amplifier and the reference voltage of negative input compare, and the output error amplifying signal is to the constant voltage module;
Described the first voltage error amplifier is connected with described second voltage error amplifier via the constant voltage module, the first order error amplification signal that produces is applied to the positive input terminal of described the second error amplifier, further produces second level error amplification signal;
Described second voltage error amplifier is connected with described trigger, the signal after the amplification of described the first error amplifier output of receiving is amplified, and the signal after amplifying exports described trigger to;
Described trigger is electrically connected to described latch, and the signal that receives is treated to the constant voltage control signal, and exports described constant voltage control signal to described driver by described latch;
Described driver is connected with described latch, according to the described constant voltage control signal by-pass cock frequency and the duty ratio that receive.
2. the application circuit based on power switch claimed in claim 1, export positive voltage, it is characterized in that, comprising: power switch, fly-wheel diode, filter inductance, diode, electric capacity, the first feedback resistance, the second feedback resistance and sampling resistor; Wherein:
Described fly-wheel diode is connected in the floating lower margin of described power switch and the low pressure of circuit is exported between ground;
Described filter inductance is connected between the low-voltage output of the floating lower margin of described power switch and circuit;
Described diode is connected between the low-voltage output of the feeder ear pin of described power switch and circuit;
Described electric capacity is connected between the negative pole end of the feeder ear pin of described power switch and described fly-wheel diode;
Be connected in after described the first feedback resistance and the series connection of the second feedback resistance between the anodal and floating lower margin of described diode, and the electric connecting point of two feedback resistances is connected with the Voltage Feedback pin of described power switch;
Described sampling resistor is connected between the current sample pin of the floating lower margin of described power switch and power switch.
3. circuit according to claim 2, is characterized in that, also comprises: starting resistance;
Described starting resistance is connected between the high pressure collector terminal and feeder ear pin of described power switch, for described power switch provides primary power.
4. circuit according to claim 3, is characterized in that, also comprises: fuse resistance, rectification module, external capacitor, output storage capacitor and load; Wherein:
Described fuse resistance one end is connected with high voltage input terminal, and the other end is connected with described rectification module;
The described rectification module other end is connected with the high pressure collector electrode pin of described power switch;
Described external capacitor is connected between the CPC pin and floating lower margin of described power switch;
Described output storage capacitor and load are connected in parallel on respectively the low-voltage output of circuit and export between ground.
5. the application circuit based on power switch claimed in claim 1, export negative voltage, it is characterized in that, comprising: power switch, fly-wheel diode, filter inductance, diode, electric capacity, the first feedback resistance, the second feedback resistance and sampling resistor; Wherein:
Described filter inductance is connected in the floating lower margin of described power switch and the low pressure of circuit is exported between ground;
Described fly-wheel diode is connected between the low-voltage output of the floating lower margin of described power switch and circuit;
Described diode is connected between the low-voltage output of the feeder ear pin of described power switch and circuit;
Described electric capacity is connected between the feeder ear pin of described power switch and its hold floatingly;
Be connected in after described the first feedback resistance and the series connection of the second feedback resistance between the anodal and floating lower margin of described diode, and the electric connecting point of two feedback resistances is connected with the Voltage Feedback pin of described power switch;
Described sampling resistor is connected between the floating lower margin and current sample pin of described power switch.
6. circuit according to claim 5, is characterized in that, also comprises: starting resistance;
Described starting resistance is connected between the high pressure collector terminal and feeder ear pin of described power switch, for described power switch provides primary power.
7. circuit according to claim 6, is characterized in that, also comprises: fuse resistance, rectification module, external capacitor, output storage capacitor and load; Wherein:
Described fuse resistance one end is connected with high voltage input terminal, and the other end is connected with described rectification module;
The described rectification module other end is connected with the high pressure collector electrode pin of described power switch;
Described external capacitor is connected between the CPC pin and floating lower margin of described power switch;
Described output storage capacitor and load are connected in parallel on respectively the low-voltage output of circuit and export between ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320007635 CN203027121U (en) | 2013-01-08 | 2013-01-08 | Power switch and application circuit based on same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320007635 CN203027121U (en) | 2013-01-08 | 2013-01-08 | Power switch and application circuit based on same |
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| Publication Number | Publication Date |
|---|---|
| CN203027121U true CN203027121U (en) | 2013-06-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320007635 Expired - Lifetime CN203027121U (en) | 2013-01-08 | 2013-01-08 | Power switch and application circuit based on same |
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| CN (1) | CN203027121U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104716816A (en) * | 2013-12-17 | 2015-06-17 | 台达电子企业管理（上海）有限公司 | Power conversion device, isolation driving circuit and isolation driving method |
-
2013
- 2013-01-08 CN CN 201320007635 patent/CN203027121U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104716816A (en) * | 2013-12-17 | 2015-06-17 | 台达电子企业管理（上海）有限公司 | Power conversion device, isolation driving circuit and isolation driving method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210127 Address after: No. 1600, Zixing Road, Minhang District, Shanghai 200241 Patentee after: BCD (SHANGHAI) MICRO-ELECTRONICS Ltd. Address before: No. 800, Yishan Road, Xuhui District, Shanghai 200030 Patentee before: BCD Semiconductor Manufacturing Limited |
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| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130626 |
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| CX01 | Expiry of patent term |