CN211127578U

CN211127578U - PNP BJT type power supply controller based on astable multivibrator

Info

Publication number: CN211127578U
Application number: CN201921887408.XU
Authority: CN
Inventors: 陈怡�; 杜树旺; 谢路耀; 周丹
Original assignee: Zhijiang College of ZJUT
Current assignee: Zhijiang College of ZJUT
Priority date: 2019-11-05
Filing date: 2019-11-05
Publication date: 2020-07-28
Anticipated expiration: 2029-11-05

Abstract

A PNP BJT type power supply controller based on an astable multivibrator comprises a port Vcc, a port Vss and a port Out, and further comprises a PNP BJT transistor Q1, a PNP BJT transistor Q2, a diode D1, a diode D2, a capacitor C1, a capacitor C2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a controlled current source 1, a controlled current source 2 and an output unit. The power supply controller can be connected with a high-voltage side power semiconductor device in the power supply, and the current magnitude of the controlled current source can directly influence the switching working period and the duty ratio of the high-voltage side power semiconductor device in the power supply. The utility model discloses but self-excited operation, simple structure, do benefit to integrated, the reliability is high, the operating voltage scope is wide, is particularly suitable for higher input voltage's application scenario.

Description

PNP BJT type power supply controller based on astable multivibrator

Technical Field

The utility model relates to a power supply controller introduces controlled current source on astable multivibrator's basis, this power supply controller all can normally work in the input voltage range of broad, not only have the dual ability of adjusting operating frequency and duty cycle, but also have the ability of drive power semiconductor device, with High voltage Side (High-Side) BJT pipe in the converter, MOS pipe, homoenergetic such as IGBT pipe matches, be particularly suitable for higher input voltage's application scenario, this power supply controller can be applied to emergency power source, the new forms of energy electricity generation, battery charge and discharge, fields such as L ED drive.

Background

Due to the market demand and standardization, most of the commercially available power controllers have an operating voltage range substantially in the range of several volts to several tens of volts. When the input voltage range of the power supply is inconsistent with the working voltage range of the power supply controller, an independent auxiliary power supply or a non-independent auxiliary power supply branch circuit is mostly adopted to supply power to the power supply controller, so that the normal work of the power supply controller is ensured. However, the independent auxiliary power supply and the dependent auxiliary power supply branch need to occupy a certain space, and also increase loss, which adversely affects the miniaturization and high efficiency of the entire power supply.

For the refinement requirement of high input voltage, the power supply needs a power supply controller with a wide working voltage range, the working voltage range can cover the input voltage range of the power supply, and an independent auxiliary power supply and a non-independent auxiliary power supply branch circuit are not needed to supply power to the power supply.

Disclosure of Invention

For overcoming the limitation of the present most commercially available power supply controller operating voltage scope, the utility model provides a PNP BJT type power supply controller based on astable multivibrator, it has fairly wide operating voltage scope, adopts its power as the controller to have the advantage in the aspect of miniaturization and high efficiency.

The utility model provides a technical scheme that its technical problem adopted is:

a PNP BJT type power supply controller based on an astable multivibrator comprises a port Vcc, a port Vss and a port Out, and further comprises a PNP BJT tube Q1, a PNP BJT tube Q2, a diode D1, a diode D2, a capacitor C1, a capacitor C2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a controlled current source 1, a controlled current source 2 and an output unit, wherein the output unit comprises a port a and a port b, an emitter of the PNP BJT tube Q1 is simultaneously connected with a first port of the controlled current source 1, a cathode of the diode D1, a cathode of the diode D2, an emitter of the PNP BJT tube Q2 and the port Vcc, a base of the PNP BJT tube Q1 is simultaneously connected with an anode of the diode D1 and one end of the resistor R1, a collector of the PNP BJT tube Q1 is simultaneously connected with the port a, one end of the resistor R3 and one end of the capacitor C2 of the output unit, a collector of the PNP BJT tube Q8656 is simultaneously, a collector of a PNP type BJT transistor Q2 is simultaneously connected with one end of a resistor R5 and one end of a capacitor C2, the other end of the resistor R1 is simultaneously connected with the other end of a capacitor C2 and a first port of a controlled current source 2, the other end of a capacitor C1 is simultaneously connected with the other end of a resistor R2, one end of a resistor R4 and a second port of the controlled current source 1, the second port of the controlled current source 2 is simultaneously connected with the other end of the resistor R3, the other end of a resistor R4, the other end of the resistor R5 and a port Vss, and a port b of an output unit is connected with a port Out;

the current is1 flowing into the first port of the controlled current source 1 affects the charging speed of the capacitor C1 when the PNP BJT Q2 is turned on and the discharging speed of the capacitor C1 when the PNP BJT Q1 is turned on, the larger is the is1>0 and is1, the shorter the on-time of the capacitor Q2 and the longer the on-time of the capacitor Q1, and further affects the control signal of the port a;

the current is2 flowing into the first port of the controlled current source 2 affects the discharging speed of the capacitor C2 when the PNP type BJT Q2 is conducted and the charging speed of the capacitor C2 when the PNP type BJT Q1 is conducted, the larger is the is2>0 and is2, the longer is the conduction time of the capacitor Q1 and the shorter is the conduction time of the capacitor Q2, and further the control signal of the port a is affected;

the output unit converts the control signal of the port a into a driving signal of the port b, so that the power supply controller has the capability of driving the power semiconductor device;

the power supply controller controls the on-off state of a power semiconductor device in the power supply, the power supply provides necessary electric energy for the power supply controller, a Vcc port of the power supply controller is a positive end of a power supply port, a Vss port of the power supply controller is a negative end of the power supply port, and an Out port of the power supply controller is connected with a control port of the power semiconductor device in the power supply.

The power supply controller may be connected to a high side power semiconductor device in the power supply.

Further, the power supply composed of the power supply controller comprises a power main circuit and a control circuit taking the power supply controller as a core, wherein the power main circuit is any power electronic circuit (such as a Buck circuit, a Buck-Boost circuit and derivatives thereof) comprising a high-voltage side power semiconductor device.

Still further, as a preferable scheme of the controlled current source 1, the controlled current source 1 further includes a PNP BJT Qsa1, a regulator Zsa1 and a resistor Rsa1, an emitter of the PNP BJT Qsa1 is connected to the first port of the controlled current source 1, a collector of the PNP BJT Qsa1 is connected to the second port of the controlled current source 1, a base of the PNP BJT Qsa1 is connected to a cathode of the regulator Zsa1, an anode of the regulator Zsa1 is connected to one end of the resistor Rsa1, and the other end of the resistor Rsa1 is connected to the Vss. The controlled current source 1 has the characteristic of supply terminal voltage adaptation, i.e. the current is1 is related to the voltage of the terminal Vcc.

As a preferable scheme of the controlled current source 2, the controlled current source 2 further includes a port Control, a resistor Rsb1, and an NPN BJT tube Qsb1, wherein one end of the resistor Rsb1 is connected to the first port of the controlled current source 2, the other end of the resistor Rsb1 is connected to the collector of the NPN BJT tube Qsb1, the base of the NPN BJT tube Qsb1 is connected to the port Control, the emitter of the NPN BJT tube Qsb1 is connected to the second port of the controlled current source 2, the port Control is connected to a detection signal in the power supply, and the detection signal includes at least one of a detection signal of an inductive current, a detection signal of a capacitive current, a detection signal of a load current, a detection signal of an inductive voltage, a detection signal of a capacitive voltage, a detection signal of a load voltage, and a detection signal of an input voltage; or, the port Control is connected with a digital-to-analog converter controlled by a programmable device, and the programmable device is a single chip, a DSP or an FPGA.

Further, as a preferred embodiment of the output unit, the output unit further includes an NPN BJT tube Qa1, a PNP BJT tube Qa2, a resistor Ra1, a capacitor Ca1, a diode Da1, and a diode Da2, wherein a collector of the NPN BJT tube Qa1 is connected to the port Vcc, a base of the NPN BJT tube Qa1 is connected to both the port a of the output unit and a base of the PNP BJT tube Qa2, a collector of the PNP BJT tube Qa2 is connected to the port Vss, an emitter of the NPN BJT tube Qa1 is connected to both the emitter of the PNP BJT tube Qa2, one end of the resistor Ra1, one end of the capacitor Ca1, and an anode of the diode Da1, the other end of the resistor Ra1 is connected to both the other end of the capacitor Ca1 and the cathode of the diode Da2, and an anode of the diode 2 is connected to both the cathode of the diode 1 and the port b of the output unit.

The output unit is matched with a P-channel MOS tube and a P-channel IGBT tube on the high-voltage side in the power supply. In the power supply, except for the control port, the high-voltage side power semiconductor device has a port which is always at a high level, the port is called a high-voltage side port, and the rest of the ports are called non-high-voltage side ports. Conventional Buck circuits contain high side power semiconductor devices. Taking a high-voltage side P-channel MOS tube as an example, a high-voltage side port of the high-voltage side P-channel MOS tube is a source electrode, a non-high-voltage side port of the high-voltage side P-channel MOS tube is a drain electrode, and a control port of the high-voltage side P-channel MOS tube is a grid electrode; taking a high-voltage side P-channel IGBT tube as an example, a high-voltage side port of the IGBT tube is an emitter, a non-high-voltage side port of the IGBT tube is a collector, and a control port of the IGBT tube is a grid. The diode Da1 functions to accelerate the turn-off speed of the high-side power semiconductor device. The capacitor Ca1 is used to accelerate the turn-on speed of the high-side power semiconductor device.

As another preferable scheme of the output unit, the output unit further includes an NPN BJT transistor Qb1, a PNP BJT transistor Qb2, a resistor Rb1, a capacitor Cb1 and a resistor Rb2, wherein a collector of the NPN BJT transistor Qb1 is connected to the port Vcc, a base of the NPN BJT transistor Qb1 is simultaneously connected to the port a of the output unit and a base of the PNP BJT transistor Qb2, a collector of the PNP BJT transistor Qb2 is connected to the port Vss, a capacitor Cb1 is connected in series to the resistor Rb2, an emitter of the NPN BJT transistor Qb1 is simultaneously connected to an emitter of the PNP BJT transistor Qb2, one end of the resistor Rb1 and one end of a serial branch of the capacitor Cb1 and the resistor Rb2, and the other end of the resistor Rb1 is simultaneously connected to the port b of the output unit and the other end of the serial branch of the capacitor Cb1 and the resistor Rb 2.

The output unit is matched with a PNP type BJT tube at the high voltage side in the power supply. The high-voltage side port of the high-voltage side PNP type BJT tube is an emitter, the non-high-voltage side port is a collector, and the control port is a base. The series branch of the capacitor Cb1 and the resistor Rb2 is used for accelerating the switching speed of the PNP type BJT on the high-voltage side.

The technical conception of the utility model is as follows: a typical astable multivibrator (see figure 1) is modified, a controlled current source is introduced on the basis, a power supply controller with a wide working voltage range is constructed, and the current magnitude of the controlled current source directly influences the switching duty cycle and the duty ratio of a power semiconductor device on a high-voltage side in a power supply. Meanwhile, the power supply controller is constructed to be suitable for any power electronic circuit including a high-voltage side power semiconductor device.

The beneficial effects of the utility model are that: the power controller has the advantages of self-excited operation, simple structure, easy integration, high reliability and wide working voltage range from several volts to hundreds of volts. When the working voltage range can cover the input voltage range of the power supply, the independent auxiliary power supply or the non-independent auxiliary power supply branch can be cancelled, so that the formed power supply has the advantages of miniaturization and high efficiency.

Drawings

Fig. 1 is a circuit diagram of a typical NPN type astable multivibrator.

Fig. 2 is a circuit diagram of an output unit scheme according to the present invention.

Fig. 3 is a circuit diagram of another embodiment of the present invention.

Fig. 4 is a partial circuit diagram (output unit omitted) of the present invention using a controlled current source 1 scheme.

Fig. 5 is a partial circuit diagram (output unit omitted) of the present invention using a controlled current source 2 scheme.

Fig. 6 is a circuit diagram adopted in embodiment 1 of the present invention.

Fig. 7 is a comparison graph (start-up phase) of the control signal va of the embodiment 1 of the present invention at the lowest input voltage and the highest input voltage in the open loop control.

Fig. 8 is a comparison graph (steady state phase) of the control signal va of the embodiment 1 of the present invention at the lowest input voltage and the highest input voltage under the control closed loop condition.

Fig. 9 is a simulation waveform diagram of embodiment 1 of the present invention under the condition of the lowest input voltage.

Fig. 10 is a simulation waveform diagram of embodiment 1 of the present invention under the condition of the highest input voltage.

Fig. 11 is a circuit diagram adopted in embodiment 2 of the present invention.

Fig. 12 is a comparison graph (start-up phase) of the control signal va of the embodiment 2 of the present invention at the lowest input voltage and the highest input voltage in the case of the open loop control.

Fig. 13 is a comparison graph (steady state phase) of the control signal va at the lowest input voltage and the highest input voltage in the case of the control closed loop according to embodiment 2 of the present invention.

Fig. 14 is a simulation waveform diagram of embodiment 2 of the present invention under the condition of the lowest input voltage.

Fig. 15 is a simulation waveform diagram of embodiment 2 of the present invention under the condition of the highest input voltage.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

Example 1

Referring to fig. 2, 4 and 5, an astable multivibrator-based PNP BJT type power controller includes a port Vcc, a port Vss and a port Out, and further includes a PNP BJT Q1, a PNP BJT Q2, a diode D1, a diode D2, a capacitor C1, a capacitor C2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a controlled current source 1, a controlled current source 2 and an output unit, the output unit includes a port a and a port b, an emitter of the PNP BJT Q1 is simultaneously connected to a first port of the controlled current source 1, a cathode of the diode D1, a cathode of the diode D2, an emitter of the PNP BJT Q2 and the port Vcc, a base of the PNP BJT Q1 is simultaneously connected to an anode of the diode D1 and a terminal of the resistor R1, a collector of the PNP BJT Q1 is simultaneously connected to a terminal of the output unit, a terminal of the resistor R3 and a terminal of the capacitor C1, the base of a PNP BJT Q2 is connected to the anode of the diode D2 and one end of the resistor R2 at the same time, the collector of the PNP BJT Q2 is connected to one end of the resistor R5 and one end of the capacitor C2 at the same time, the other end of the resistor R1 is connected to the other end of the capacitor C2 and the first port of the controlled current source 2 at the same time, the other end of the capacitor C1 is connected to the other end of the resistor R2, one end of the resistor R4 and the second port of the controlled current source 1 at the same time, the second port of the controlled current source 2 is connected to the other end of the resistor R3, the other end of the resistor R4, the other end of the resistor R5 and the Vss port, and the port b of the; the output unit converts the control signal of the port a into a driving signal of the port b, so that the power supply controller has the capability of driving the power semiconductor device; the power supply controller controls the on-off state of a power semiconductor device in the power supply, the power supply provides necessary electric energy for the power supply controller, a Vcc port of the power supply controller is a positive end of a power supply port, a Vss port of the power supply controller is a negative end of the power supply port, and an Out port of the power supply controller is connected with a control port of the power semiconductor device in the power supply.

Further, the controlled current source 1 further includes a PNP BJT transistor Qsa1, a voltage regulator Zsa1, and a resistor Rsa1, an emitter of the PNP BJT transistor Qsa1 is connected to a first port of the controlled current source 1, a collector of the PNP BJT transistor Qsa1 is connected to a second port of the controlled current source 1, a base of the PNP BJT transistor Qsa1 is connected to a cathode of the voltage regulator Zsa1, an anode of the voltage regulator Zsa1 is connected to one end of the resistor Rsa1, and the other end of the resistor Rsa1 is connected to a Vss port. The controlled current source 1 has the characteristic of supply terminal voltage adaptation, i.e. the current is1 is related to the voltage of the terminal Vcc.

The controlled current source 2 further comprises a port Control, a resistor Rsb1 and an NPN-type BJT tube Qsb1, wherein one end of the resistor Rsb1 is connected to the first port of the controlled current source 2, the other end of the resistor Rsb1 is connected to a collector of the NPN-type BJT tube Qsb1, a base of the NPN-type BJT tube Qsb1 is connected to the port Control, an emitter of the NPN-type BJT tube Qsb1 is connected to the second port of the controlled current source 2, the port Control is connected to a detection signal in the power supply, and the detection signal includes at least one of a detection signal of an inductive current, a detection signal of a capacitive current, a detection signal of a load current, a detection signal of an inductive voltage, a detection signal of a capacitive voltage, a detection signal of a load voltage, and a detection signal of an input voltage; or, the port Control is connected with a digital-to-analog converter controlled by a programmable device, and the programmable device is a single chip, a DSP or an FPGA.

Still further, the output unit further includes an NPN BJT transistor Qa1, a PNP BJT transistor Qa2, a resistor Ra1, a capacitor Ca1, a diode Da1, and a diode Da2, wherein a collector of the NPN BJT transistor Qa1 is connected to the port Vcc, a base of the NPN BJT transistor Qa1 is connected to both the port a of the output unit and a base of the PNP BJT transistor Qa2, a collector of the PNP BJT transistor Qa2 is connected to the port Vss, an emitter of the NPN BJT transistor Qa1 is connected to both the emitter of the PNP BJT transistor Qa2, one end of the resistor Ra1, one end of the capacitor Ca1, and an anode of the diode Da1, the other end of the resistor Ra1 is connected to both the other end of the capacitor Ca1 and a cathode of the diode Da2, and an anode of the diode Da2 is connected to both a cathode of the diode 1 and the port b of the output unit. The output unit is matched with a P-channel MOS tube and a P-channel IGBT tube on the high-voltage side in the power supply.

In contrast to the typical NPN type astable multivibrator shown in fig. 1, the power supply controller is a dual PNP type modified version thereof. In order to meet the requirements of wide working voltage and high input voltage application, the power controller is additionally provided with D1 and D2 on the basis of improvement, the power controller has the function of inhibiting negative voltage appearing on base-emitters of Q1 and Q2 in the oscillation process, the base-emitters of Q1 and Q2 can be prevented from being reversely broken down, and meanwhile, the oscillation working frequency can be improved; r1 and R2 are added, the function of the R1 and R2 is to limit the base current of Q1 and Q2 during oscillation, and the base of Q1 and Q2 can be prevented from overheating.

In addition to the similar structure, the self-oscillation working mechanism of the power supply controller is similar to that of an unstable multivibrator. In the operating voltage range where the controlled current source 1 is active (i.e., is1>0), Q1 and Q2 are turned on and off alternately, and the operating frequency of oscillation is related to the voltage at port Vcc.

To provide a wide duty cycle range, the power supply controller takes C1< < C2. Furthermore, both the controlled current source 1 and the controlled current source 2 can influence the duty cycle of the control signal at port a. The current is1 flowing into the first port of the controlled current source 1 affects the charging speed of the capacitor C1 when the PNP BJT Q2 is turned on and the discharging speed of the capacitor C1 when the PNP BJT Q1 is turned on, the larger is the is1>0 and is1, the shorter the on-time of the capacitor Q2 and the longer the on-time of the capacitor Q1, and further affects the control signal of the port a; the current is2 flowing into the first port of the controlled current source 2 affects the discharging speed of the capacitor C2 when the PNP BJT Q2 is turned on and the charging speed of the capacitor C2 when the PNP BJT Q1 is turned on, and the larger is the is2>0 and is2, the longer the Q1 is turned on, the shorter is the Q2 is turned on, and further the control signal of the port a is affected. By using the controlled current source 1 and the controlled current source 2 properly, an effective feedforward or feedback control loop can be formed.

Still further, referring to FIG. 6, a power supply comprising the power supply controller comprises a power main circuit and a control circuit having the power supply controller as a core, wherein the power main circuit comprises a P-channel MOS transistor Mn, a diode Dn, a capacitor Cn, an inductor n, a capacitor Cn and a resistor Rn, the positive terminal of the DC power supply is connected to the source of the P-channel MOS transistor Mn and the anode of the diode Dn, the drain of the P-channel MOS transistor Mn is connected to the anode of the diode Dn, the cathode of the diode Dn is connected to one terminal of the capacitor Cn and one terminal of the inductor n, the other terminal of the inductor n is connected to one terminal of the capacitor Cn and one terminal of the load, the other terminal of the load is connected to the other terminal of the capacitor Cn, one terminal of the inductor n and one terminal of the resistor Rn, the other terminal of the capacitor Cn is connected to the cathode of the diode Dn, the other terminal of the resistor Rn is connected to the negative terminal of the DC power main circuit Cn, the power main circuit is a power electronic circuit of a type, wherein Mn is a high voltage side semiconductor power supply, a power circuit, a power supply, a power.

The Control circuit comprises the power supply controller and a voltage regulator tube Zn1, wherein a Vcc port of the power supply controller is simultaneously connected with the positive end of a direct-current power supply and the cathode of a voltage regulator tube Zn1, an Out port of the power supply controller is simultaneously connected with the anode of the voltage regulator tube Zn1 and the grid of a P-channel MOS tube Mn1, a Control port of the power supply controller is connected with one end of a resistor Rn1, and a Vss port of the power supply controller is connected with the negative end of the direct-current power supply. The function of the regulator tube Zn1 is to prevent the source-gate voltage of Mn1 from being too high. The control circuit performs dual control of the power main circuit: and controlling the peak value of the input current ii and adaptively controlling the direct-current power supply voltage Vi.

For a wider and higher input voltage application, i.e. the dc power voltage Vi is 120-177V, Mn1 can adopt IRF9610, Q1, Q2, Qsa1, Qa2 can adopt MPSA94, Qsb1 and Qa1 can adopt MPSA44, Zsa1 can adopt d05az 100. select a voltage type load (e.g. battery and L ED), simulate the embodiment 1. fig. 7 is a comparison graph (start-up phase) of the Control signal va when controlling the lowest input voltage and the highest input voltage under the open-loop condition, fig. 8 is a comparison graph (steady-state phase) of the Control signal va when controlling the lowest input voltage and the highest input voltage under the closed-loop condition, fig. 7 is a comparison graph of the Control signal va under the open-loop condition (i.e. the port Control is disconnected from the main power circuit and then is shorted to Vss), the lowest input voltage Vi is 120V and the highest input voltage Vi V is 120V) when controlling the main power voltage, the input voltage V is 120V 177V, the dc power source controller can operate under the same conditions as the wide input voltage source controller, the input voltage type load V is connected to the open-loop condition, the dc power source controller can be operated under the same as the wide-controlled voltage type load, the closed-open-loop condition, the dc power source controller can be operated voltage simulation graph (i.e. the controlled power source controller can be operated under the open-loop condition, the open-loop condition, the open-open.

Example 2

Referring to fig. 3, 4 and 5, an astable multivibrator-based PNP BJT type power controller includes a port Vcc, a port Vss and a port Out, and further includes a PNP BJT Q1, a PNP BJT Q2, a diode D1, a diode D2, a capacitor C1, a capacitor C2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a controlled current source 1, a controlled current source 2 and an output unit, the output unit includes a port a and a port b, the output unit further includes an NPN BJT Qb1, a PNP BJT Qb2, a resistor Rb1, a capacitor Cb1 and a resistor Rb2, a collector of the NPN BJT Qb1 is connected to the port Cb1, a base of the NPN BJT Qb1 is connected to the port a of the output unit and a base of the PNP BJT Qb2, a collector of the PNP BJT Qb2 is connected to the port Vss, a collector of the PNP BJT Qb 8653, and an emitter of the PNP BJT 8427 is connected to the PNP BJT Qb 8653, and the emitter of the PNP BJT 8427 in series, and, One end of the resistor Rb1 and one end of the series branch of the capacitor Cb1 and the resistor Rb2 are connected, and the other end of the resistor Rb1 is connected with the port b of the output unit and the other end of the series branch of the capacitor Cb1 and the resistor Rb 2. The output unit is matched with a PNP type BJT tube at the high voltage side in the power supply.

The rest of the power controller in embodiment 2 is the same as that in embodiment 1, and the operation mechanism is similar.

Further, referring to fig. 11, the power supply composed of the power supply controller includes a power main circuit and a control circuit having the power supply controller as a core.

The power main circuit comprises an inductor k, a diode Dk, a capacitor Ck, a diode Dk, a PNP BJT Qk, an inductor k, a resistor Rk and a capacitor Ck, wherein the positive end of a direct current power supply is connected with one end of the inductor 0k and the cathode of the diode Dk, the other end of the inductor 1k is connected with the anode of the diode Dk, one end of the capacitor Ck and the emitter of the PNP BJT Qk, the other end of the capacitor Ck is connected with the cathode of the diode Dk and the anode of the diode Dk, the cathode of the diode Dk is connected with the collector of the PNP BJT Qk, the collector of the PNP BJT Qk and one end of the inductor k, the other end of the inductor Rk is connected with one end of the resistor Rk, the other end of the resistor Rk is connected with one end of the capacitor Ck and one end of the load, the other end of the load is connected with the other end of the capacitor Ck, the anode of the diode Dk and the direct current power supply, the negative end of the power supply, the power main circuit is connected with the base of the diode Dk, the power supply, the diode Dk, the load, the power supply, the power main circuit, the load is connected with a constant voltage, the power supply, the power circuit, the load, the power circuit, the load is cut-on, the power circuit, the constant-on circuit, the power circuit, the load is connected with the diode Dk, the diode and the diode Dk, the constant-side circuit, the constant-.

The Control circuit comprises the power supply controller, a resistor Rk1, a diode Dk3, a resistor Rk2 and a diode Dk4, wherein a port Vcc of the power supply controller is simultaneously connected with an emitter of a PNP type BJT tube Qk1, one end of a resistor Rk1, a cathode of a diode Dk3, one end of a resistor Rk2 and a cathode of a diode Dk4, the other end of the resistor Rk1 is simultaneously connected with an anode of a diode Dk3 and a base of a PNP type BJT tube Qk1, a port Out of the power supply controller is simultaneously connected with the other end of a resistor Rk2, an anode of a diode Dk4 and a base of a PNP type BJT tube Qk2, a port Control of the power supply controller is connected with one end of a resistor Rk3, and a port Vss of the power supply controller is connected with the other end of a resistor Rk 3.

For a wider and higher input voltage application, i.e. the dc power voltage Vi is 120-.

Fig. 12 is a comparison graph (start-up phase) of the control signal va of the embodiment 2 of the present invention at the lowest input voltage and the highest input voltage in the case of the open loop control. Fig. 13 is a comparison graph (steady state phase) of the control signal va at the lowest input voltage and the highest input voltage in the case of the control closed loop according to embodiment 2 of the present invention. As can be seen from fig. 12, in the case of an open-loop Control (i.e., when the port Control is disconnected from the power main circuit and then shorted to the port Vss), the power controller can operate by self-excitation when the minimum input voltage Vi _ min (120V) and the maximum input voltage Vi _ max (177V) are both applied, but the Control signal voltage va at the port a has a difference, and the oscillation frequency and the duty ratio are different. This shows that the power supply controller has the characteristic of self-adaption of direct current power supply voltage or input voltage. As can be seen from comparison between fig. 12 and fig. 13, in the case of a closed Control loop (i.e., the port Control is connected to the power main circuit), after the load voltage Vo rises and stabilizes, the port Control changes the oscillation operating frequency and the duty ratio of va under the action of the controlled current source 2. Fig. 14 is a simulation waveform diagram of embodiment 2 of the present invention at the lowest input voltage. Fig. 15 is a waveform diagram of simulation of embodiment 2 of the present invention at the time of the highest input voltage. As can be seen from fig. 14 and 15, the power supply can achieve a constant load voltage Vo over a wide range of dc input voltages, and Vo < Vi.

The embodiments described in this specification are merely illustrative of implementations of the inventive concepts, and the scope of the invention should not be considered limited to the specific forms set forth in the embodiments, but rather by the claims and their equivalents.

Claims

1. A PNP BJT type power supply controller based on astable multivibrator is characterized in that: the PNP BJT type power supply controller based on the astable multivibrator comprises a port Vcc, a port Vss and a port Out, and further comprises a PNP BJT tube Q1, a PNP BJT tube Q2, a diode D1, a diode D2, a capacitor C1, a capacitor C2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a controlled current source 1, a controlled current source 2 and an output unit, wherein the output unit comprises a port a and a port b, an emitter of the PNP BJT tube Q1 is simultaneously connected with a first port of the controlled current source 1, a cathode of the diode D1, a cathode of the diode D2, an emitter of the PNP BJT tube Q2 and the port Vcc, a base of the PNP BJT tube Q1 is simultaneously connected with an anode of the diode D1 and one end of the resistor R1, a collector of the PNP BJT tube Q1 is simultaneously connected with one end of the port a, one end of the resistor R3 and one end of the capacitor C1, a base of the PNP BJT tube Q56 is simultaneously connected, a collector of a PNP type BJT transistor Q2 is simultaneously connected with one end of a resistor R5 and one end of a capacitor C2, the other end of the resistor R1 is simultaneously connected with the other end of a capacitor C2 and a first port of a controlled current source 2, the other end of a capacitor C1 is simultaneously connected with the other end of a resistor R2, one end of a resistor R4 and a second port of the controlled current source 1, the second port of the controlled current source 2 is simultaneously connected with the other end of the resistor R3, the other end of a resistor R4, the other end of the resistor R5 and a port Vss, and a port b of an output unit is connected with a port Out;

the current is1 flowing into the first port of the controlled current source 1 affects the charging speed of the capacitor C1 when the PNP type BJT Q2 is conducted and the discharging speed of the capacitor C1 when the PNP type BJT Q1 is conducted, and further affects the control signal of the port a;

the current is2 flowing into the first port of the controlled current source 2 affects the discharging speed of the capacitor C2 when the PNP BJT Q2 is turned on and the charging speed of the capacitor C2 when the PNP BJT Q1 is turned on, and further affects the control signal of the port a;

2. The astable multivibrator-based PNP BJT type power supply controller of claim 1, wherein: the power supply composed of the power supply controller comprises a power main circuit and a control circuit taking the power supply controller as a core, wherein the power main circuit is any power electronic circuit comprising a high-voltage side power semiconductor device.

3. The astable multivibrator-based PNP BJT type power supply controller of claim 1, wherein: the controlled current source 1 further comprises a PNP type BJT transistor Qsa1, a voltage regulator tube Zsa1 and a resistor Rsa1, an emitter of the PNP type BJT transistor Qsa1 is connected with a first port of the controlled current source 1, a collector of the PNP type BJT transistor Qsa1 is connected with a second port of the controlled current source 1, a base of the PNP type BJT transistor Qsa1 is connected with a cathode of the voltage regulator tube Zsa1, an anode of the voltage regulator tube Zsa1 is connected with one end of the resistor Rsa1, and the other end of the resistor Rsa1 is connected with a port Vss.

4. The astable multivibrator-based PNP BJT type power supply controller of claim 1, wherein: the controlled current source 2 further comprises a port Control, a resistor Rsb1 and an NPN type BJT tube Qsb1, wherein one end of the resistor Rsb1 is connected to the first port of the controlled current source 2, the other end of the resistor Rsb1 is connected to the collector of the NPN type BJT tube Qsb1, the base of the NPN type BJT tube Qsb1 is connected to the port Control, the emitter of the NPN type BJT tube Qsb1 is connected to the second port of the controlled current source 2,

the port Control is connected with a detection signal in the power supply, and the detection signal comprises at least one of a detection signal of inductive current, a detection signal of capacitive current, a detection signal of load current, a detection signal of inductive voltage, a detection signal of capacitive voltage, a detection signal of load voltage and a detection signal of input voltage;

or, the port Control is connected with a digital-to-analog converter controlled by a programmable device, and the programmable device is a single chip, a DSP or an FPGA.

5. The astable multivibrator-based PNP BJT type power supply controller as claimed in any one of claims 1-4, characterized in that: the output unit further comprises an NPN BJT tube Qa1, a PNP BJT tube Qa2, a resistor Ra1, a capacitor Ca1, a diode Da1 and a diode Da2, wherein the collector of the NPN BJT tube Qa1 is connected with a port Vcc, the base of the NPN BJT tube Qa1 is simultaneously connected with the port a of the output unit and the base of the PNP BJT tube Qa2, the collector of the PNP BJT tube Qa2 is connected with the port Vss, the emitter of the NPN BJT tube Qa1 is simultaneously connected with the emitter of the PNP BJT tube Qa2, one end of the resistor Ra1, one end of the capacitor Ca1 and the anode of the diode Da1, the other end of the resistor Ra1 is simultaneously connected with the other end of the capacitor Ca1 and the cathode of the diode Da2, and the anode of the diode Da2 is simultaneously connected with the cathode of the diode Da 1.

6. The PNP BJT type power supply controller based on the astable multivibrator as recited in claim 5, wherein the power supply composed of said power supply controller includes a power main circuit and a control circuit using said power supply controller as a core, said power main circuit includes a P-channel MOS transistor Mn1, a diode Dn1, a diode Dn2, a capacitor Cn1, an inductor L n1, an inductor L n2, a capacitor Cn2 and a resistor Rn1, the positive terminal of the DC power supply is connected to the source of the P-channel MOS transistor Mn1 and the anode of the diode Dn1, the drain of the P-channel MOS transistor Mn1 is connected to the anode of the diode Dn1, the cathode of the diode Dn1 is connected to one terminal of the capacitor Cn1 and one terminal of the inductor 1, the other terminal of the inductor 1 n1 is connected to one terminal of the capacitor Cn1 and one terminal of the load, the other terminal of the load is connected to the other terminal of the capacitor Cn1, the other terminal of the capacitor Cn1 and the cathode of the resistor Rn1 and the diode Rn1 are connected to the other terminal of the diode Cn 1;

the Control circuit comprises the power supply controller and a voltage regulator tube Zn1, wherein a Vcc port of the power supply controller is simultaneously connected with a positive end of a direct-current power supply and a cathode of a voltage regulator tube Zn1, an Out port of the power supply controller is simultaneously connected with an anode of the voltage regulator tube Zn1 and a grid electrode of a P-channel MOS tube Mn1, and a Control port of the power supply controller is connected with one end of a resistor Rn 1.

7. The astable multivibrator-based PNP BJT type power supply controller as claimed in any one of claims 1-4, characterized in that: the output unit further comprises an NPN-type BJT tube Qb1, a PNP-type BJT tube Qb2, a resistor Rb1, a capacitor Cb1 and a resistor Rb2, wherein a collector of the NPN-type BJT tube Qb1 is connected with a port Vcc, a base of the NPN-type BJT tube Qb1 is simultaneously connected with a port a of the output unit and a base of the PNP-type BJT tube Qb2, a collector of the PNP-type BJT tube Qb2 is connected with a port Vss, a capacitor Cb1 is connected with the resistor Rb2 in series, an emitter of the NPN-type BJT tube Qb1 is simultaneously connected with an emitter of the PNP-type BJT tube Qb2, one end of the resistor Rb1 and one end of a series branch of the capacitor Cb1 and the resistor Rb2, and the other end of the resistor Rb1 is simultaneously connected.

8. The PNP BJT type power supply controller based on the astable multivibrator as recited in claim 7, wherein the power supply composed of the power supply controller includes a power main circuit and a control circuit using the power supply controller as a core, the power main circuit includes an inductor k, a diode Dk, a capacitor Ck, a diode Dk, a PNP BJT transistor Qk, an inductor k, a resistor Rk and a capacitor Ck, a positive terminal of the DC power supply is connected to one end of the inductor k and a cathode of the diode Dk, the other end of the inductor k is connected to an anode of the diode Dk, one end of the capacitor Ck and an emitter of the PNP BJT transistor Qk, the other end of the capacitor Ck is connected to a cathode of the diode Dk and an anode of the diode Dk, a cathode of the diode Dk is connected to a collector of the PNP BJT transistor Qk, a collector of the PNP BJT transistor Qk and one end of the inductor k, the other end of the inductor k is connected to one end of the resistor Rk, the other end of the capacitor Rk and the negative terminal of the BJT transistor Dk, and the emitter of the PNP BJT transistor;

the Control circuit comprises the power controller, a resistor Rk1, a diode Dk3, a resistor Rk2 and a diode Dk4, wherein a port Vcc of the power controller is simultaneously connected with an emitter of a PNP type BJT tube Qk1, one end of a resistor Rk1, a cathode of a diode Dk3, one end of a resistor Rk2 and a cathode of a diode Dk4, the other end of a resistor Rk1 is simultaneously connected with an anode of the diode Dk3 and a base of a PNP type BJT tube Qk1, a port Out of the power controller is simultaneously connected with the other end of the resistor Rk2, an anode of a diode Dk4 and a base of the PNP type BJT tube Qk2, a port Control of the power controller is connected with one end of the resistor Rk3, and a port Vss of the power controller is connected with the other end of the resistor Rk 3.