JPS59161005A - Circuit element drive device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field The present invention relates to a circuit element driving apparatus, and more particularly to a circuit element driving apparatus for sequentially driving at least two capacitive or inductive circuit elements capable of storing energy.

r3) Prior art When turning on and off a circuit element that can store energy, that is, an inductive or capacitive circuit element, the energy that should be or is stored in this circuit element is temporarily increased or decreased. There must be. This means that such a circuit element can only be turned on and off completely after a predetermined period of time, which is determined by the time constant of the circuit. If this circuit element is then used to indirectly activate other switching means, a put time occurs between the activation command and the actual switching point, which is often a nuisance. . For example, electromagnetic valves used in automobile hydraulic systems are examples. This is because, with such a solenoid valve, the magnetic field in the excitation coil of the solenoid valve must be created or removed without switching. The hydraulic function to be switched by the solenoid valve therefore takes place with a delay compared to the electrical switching command. This poses a problem when such a device is used in a motor vehicle, where hydraulic switching functions have to be carried out in a predetermined chronological order. For example, in the case of an automobile's anti-skid device (anti-lock device), each mode of pressure increase, pressure maintenance, and pressure decrease occurs successively, and in this case, each mode occurs many times and over time. This becomes a big problem when it is used in a device where the problem occurs very quickly.

Such problems also occur when used in automatic transmission gears of automobiles. That is, switching from one gear ratio to the other gear ratio is similarly performed by cutting the solenoid valve.

C) Purpose Therefore, the present invention aims to eliminate such conventional drawbacks, and provides a circuit element driving device that can reliably perform switching operations without time delay. .

According to the present invention, in order to shorten the operating time of the circuit elements to be driven, a configuration is adopted in which energy stored in one circuit element to be cut off is extracted and used for pre-excitation of the other circuit element. did.

2) Embodiments The present invention will be described in detail below according to embodiments shown in the drawings.

In FIG. 1, the reference numeral 1 indicates an electronic control device, such as an anti-skid device (anti-lock device) ABS, an electronic gear control device, an automatic transmission device, etc. of an automobile. A switching transistor 12 and an excitation coil 13 of the first solenoid valve are connected between the power supply line 10 and the ground line 11.
, the second switching transistor 14 are connected in series, and the switching transistor 1γ and the second switching transistor 14 are connected in series.
A series circuit consisting of an excitation coil 18 of a solenoid valve and a switching transistor 19 is connected. These solenoid valves are used in automobile hydraulic systems, such as anti-skid systems or automatic transmission systems. In that case, the switching transistor 12.14 is connected to the control electrode 1
5.16 and the switching transistor 17.19 has a control electrode 20.21. The end of the coil 13 on the power wire sum side is connected to the end of the excitation coil 18 on the ground wire 11 side via a switching transistor 22, and the opposite ends of the coils 13 and 18 are connected to a switching transistor 24, respectively. connected via. These switching transistors 22,24 have control electrodes 23.
It has 25. Control electrode 15.16.20°21.23
．． 24 are each connected to an electronic control device. The power supply voltage is UB, and the current flowing through the coil 13 is I13.
Also, the current flowing through the coils 18 is respectively indicated by L++.

In FIGS. 2(a) to (f), the voltages U]5·UI6, U3O, U2+ + 023,
U25 is shown, in which case the voltages indicated by the suffix are respectively the voltages of the transistors 12.1
4.17.1°9, 22.24 Split Tube The operation of the circuit shown in FIG. 1 will be explained based on FIG. 2.

At time to, the transistor 12.14 conducts via the voltages USs and UI6, so that the current 113 flowing through the coil 13 increases exponentially. When current 113 reaches a predetermined value, at time t1 transistor 14 is switched off via voltage IJ+e and at the same time transistor 24.19 is activated via voltages U21, U25. As a result, current I+3 does not flow through transistor 14, but instead flows through transistor 24, coil 18, and transistor 19 in the direction of ground. As a result, when the coil 13 is cut off, the stored energy to be disintegrated is extracted via the transistor 24 and the coil 13 to be driven next.
8 will be pre-excited. This pre-excitation state is to 1
t, which means that at time t2 the voltage US
s, the transistor 12.14 is cut off via U25 and continues until the transistor 17 becomes conductive via the voltage U20. At this time, the coil 18 is connected via the transistors 1.gamma. and 19 between the voltage UB and the ground, and the current Ls rises from the value it had at the end of the pre-excitation to the final value obtained at the time t3. This time, the above-described steps are performed in reverse order, so that the coil 13 is energized for a time Δ2t, and this, ζ-, continues until time t4. Similarly, the coil 18 is pre-energized during the switching between times ts and t6, ie during Δ3t.

Although the drawings in FIG. 2(g) are not necessarily drawn to scale due to time constraints, it can be seen that the coils 13 and 18 have characteristics that almost cross each other. Also, pre-excitation period △mount △2t
It can also be seen that the time constant between +Δ3t is different from the time constant when the coil 13°18 is directly connected to the power sources i1o and ii.

Also, the control signal USs illustrated in FIGS. 2(a) to (f)
Once the system is in operation, the T U25 decay can be easily obtained by shortening the pulse by regulating it and shifting the phase from the fundamental frequency. In addition, as an embodiment of the present invention, the third
It is also possible to use a simple control method as illustrated in the figure.

In the embodiment shown in FIG. 3, the switching transistors 12, 1γ, 22, 24 of FIG.
1.32.33, and other circuit elements are the same as in FIG. 1 and are given the same reference numerals.

In the circuit of FIG. 3, transistors 16 and 21 are driven in opposite phase. That is, transistor 19 is activated at the same time as transistor 14 is turned off. The energy thus stored in the coil 13 becomes a current that flows through the third diode 33, the coil 18, and the transistor 19 to the ground. This state continues until the collector voltage of the transistor 14 becomes larger than the value obtained by subtracting the forward voltage of the diode 31 from the power supply voltage UB. In this case, diodes 30-33 are diodes with short reverse recovery times, and the collector-emitter saturation voltage of transistor 14.19 must be smaller than the forward voltage of diode 32.33.

The circuit shown in FIG. 4 consists of a combination of the circuits shown in FIGS.
As shown in the figure, the diodes 30, 31 and switching transistors 14, 19 are connected in series, but the connection points of the coils 13, 18 are not connected through the diodes, but rather through control terminals 41, 43, respectively. The two switching transistors 40 and 42 are connected to each other via a series circuit. In that case, the connection point of the switching transistors 40.42 is the diode 45.42.
46, the diode 45.4
The other terminal of 6 is connected to the opposite end of coil 13.18. The common connection point of the elements 40, 42, 45, 46 is connected to the ground wire 11 through a capacitor 44 and also via a valve.

As shown in FIGS. 5(a) and 5(b), the switching transistors 14 and 19 are driven in opposite phases. On the other hand, the switching transistors 40, 42 are activated only for a short time during switching. This is shown in Figure 5(c), (d
) is illustrated. As a result, a regular voltage appears on the capacitor 44 as shown in FIG. 5(e).

For example, when transistor 14 is cut off and transistor 19 is turned on at the same time (see time t1), transistor 4
2 is activated momentarily and the energy of the coil 13 is stored in the capacitor for a short time. Thereby the coil 13
A fairly rapid current decrease occurs in the coil 18, while a rapid current increase occurs in the coil 18 (period t1 to t1 in FIG. 5(f)).
(see t2). In this way, the capacitor acting as an intermediate memory improves energy delivery and reduces switching times, so that the coils 13, 18 are driven substantially continuously and alternately.

E) Effect As described above, according to the present invention, when one circuit element is cut off, the energy key stored in this circuit element is taken out and used for preliminary excitation of the other circuit element.
When switching circuit elements that store energy, virtually no switching interruptions occur.

As described above, the device of the present invention is particularly suitable for use in anti-skid devices and automatic transmission gears of automobiles. This is because the device according to the invention makes it possible to switch the solenoid valve back and forth accurately and quickly. Further, since no intermediate state occurs, the present invention is particularly suitable for use in hydraulic systems that require a high degree of safety.

Particularly accurate switching operations are obtained when switching transistors are used to turn on/off or extract stored energy.

Also, when a diode is used instead of a transistor, the effect of reducing the number of switching commands can be obtained.

[Brief explanation of the drawing]

Each figure is a detailed explanation of the present invention, and FIG. 1 is a circuit diagram showing the first embodiment of the device of the present invention, and FIG.
) to (g) are signal waveform diagrams explaining the operation of the circuit in FIG. 1, FIGS. 3 and 4 are circuit diagrams showing different embodiments, and FIGS. FIG. 3 is a signal waveform diagram illustrating the operation of the circuit illustrated in the figure. 1... Electronic control device, 13.18... Excitation coil, 15-19... Switching transistor. Engraving of the drawings (no changes to the contents) pu'' (j QJ Q-g Meto 〆〉 to 6-〉 8 && eyes Fufufukov procedural amendment letter, April 12, 1980, Mr. Commissioner of the Japan Patent Office 1, of the case) Display 1982 Patent Application No. 179462 2,
Name of the invention: Circuit element driving device 3. Person making the amendment: Relationship to the present case: Patent applicant: 4. Agent: Telephone: 03 (268) 2481
(("U5, Date of amendment order: March 27, 1980 (shipment date) 6, Drawing subject to amendment 7, Contents of amendment: We have submitted a drawing clearly drawn using dark ink. No change

Claims (1)

[Claims] 1) In a circuit element driving device that sequentially drives at least two capacitive or inductive circuit elements, when one circuit element is cut off, the energy stored in this circuit element is A circuit element driving device characterized in that the circuit element is used for preliminary excitation of the other circuit element. 2) The circuit element drive device according to claim 1, wherein the circuit element is a coil (13, 18) of a solenoid valve used in a hydraulic system of an automobile.
18) is connected to one power line through the first switch and to the other power line through the second switch, and each terminal of the coil is connected to each other in a cross shape through the third switch. A circuit element driving device according to claim 2. 4) The switch is a switching transistor (12,
14, "17.19, 20, 22.24). 5) The first or second switch is a transistor (
14, 19), and the second or first switch and the third switch are diodes (30, 31° 32.33
) The circuit element driving device according to claim 3, comprising: 6) The first or second switch is a transistor (
14, 19), and the second or first switch is a diode (30, 31), in which case the terminal of the coil (13, 18) facing the diode (30, 31) is connected to the transistor (40). , 42) to a common switching point, which is connected to a common switching point via a diode (45, 42).
46) to the other terminal of the coil (13, 18), and is connected to the power supply line (1) via a capacitor (44).
1) A circuit element driving device according to claim 3, which is connected to.